In internal combustion engines a turbocharger is a turbine-driven, forced-induction compressor powered by the engine's exhaust gas. Foil bearings are a type of air bearing. A shaft is supported by a compliant spring loaded foil journal lining The internal combustion engine is an engine in which the Combustion of Fuel and an Oxidizer (typically air occurs in a confined space called a A turbine is a rotary Engine that extracts Energy from a Fluid flow Forced induction is a term used to describe Internal combustion engines that are not naturally aspirated. This is in contrast to a supercharger, which is mechanically driven by the engine's crankshaft via a belt or chain. A supercharger is an air compressor used for Forced induction of an Internal combustion engine.
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Nomenclature
Early manufacturers of turbochargers referred to them as "turbosuperchargers". A supercharger is an air compressor used for forced induction of an engine. Logically then, adding a turbine to turn the supercharger would yield a "turbosupercharger". However, the term was soon shorted to "turbocharger". This is now a source of confusion, as the term "turbosupercharged" is now used to refer to an engine that uses both a crankshaft-driven supercharger and an exhaust-driven turbocharger.
Some companies such as Teledyne Continental Motors still use the term turbosupercharger in its original sense. Continental Motors ( Teledyne Continental Motors) is an engine manufacturer located in Mobile Alabama.
Working principle
A turbocharger consists of a turbine and a compressor linked by a shared axle. A turbine is a rotary Engine that extracts Energy from a Fluid flow A gas compressor is a mechanical device that increases the Pressure of a Gas by reducing its Volume. The turbine inlet receives exhaust gases from the engine causing the turbine wheel to rotate. This rotation drives the compressor, compressing ambient air and delivering it to the air intake manifold of the engine at higher pressure, resulting in a greater amount of the air entering the cylinder. In some instances, compressed air is routed through an intercooler which cools the air before introduction to the intake manifold, as the reduced density of hot air will cause a loss in power gained through turbocharging. An intercooler, or Charge air cooler, is an air-to-air or air-to-liquid heat exchange device used on turbocharged and supercharged (forced
The objective of a turbocharger is the same as a supercharger; to improve upon the size-to-output efficiency of an engine by solving one of its cardinal limitations. A naturally aspirated automobile engine uses only the downward stroke of a piston to create an area of low pressure in order to draw air into the cylinder through the intake valves. A naturally-aspirated engine or normally-aspirated engine (or "N/A" - Aspiration meaning breathing refers to an Internal combustion engine Because the pressure in the cylinder cannot go below 0 psi (vacuum), and because of the relatively constant pressure of the atmosphere (about 15 psi), there ultimately will be a limit to the pressure difference across the intake valves and thus the amount of airflow entering the combustion chamber. A combustion chamber is the part of an Engine in which Fuel is burned This ability to fill the cylinder with air is its volumetric efficiency. Volumetric efficiency in Internal combustion engine Design refers to the efficiency with which the engine can move the charge into and out of the cylinders Because the turbocharger increases the pressure at the point where air is entering the cylinder, and the amount of air brought into the cylinder is largely a function of time and pressure difference, more air will be forced in as the inlet manifold pressure increases. The additional air makes it possible to add more fuel (if a turbo is attached without any other engine enhancements it most likely will cause the engine to run lean -- too much air, not enough fuel), increasing the power and torque output of the engine to about 15 to 40 percent, particularly at high engine rotation speeds.
Because the pressure in the cylinder must not go too high to avoid pre-ignition and physical damage, the intake pressure must be controlled and this is done by a wastegate, which controls boost by routing some of the exhaust flow, away from the exhaust side turbine. A wastegate is a Valve that diverts Exhaust gases away from the Turbine wheel in a Turbocharged engine system This controls shaft speed and regulates boost pressure in the inlet tract.
The application of a compressor to increase pressure at the point of cylinder air intake is often referred to as forced induction. Forced induction is a term used to describe Internal combustion engines that are not naturally aspirated. Centrifugal superchargers operate in the same fashion as a turbo; however, the energy to spin the compressor is taken from the rotating output energy of the engine's crankshaft as opposed to normally exhausted gas from the motor. The centrifugal-type supercharger is an engine-driven compressor used to increase the power output of an Internal-combustion engine by increasing the amount of available Superchargers and turbochargers use output energy from an engine to achieve a net gain, which must be provided from some of the engine's total output. In the case of superchargers, either directly or from a separate smaller engine, perhaps electrically driven from the main engine's generator.
History
The turbocharger was invented by Swiss engineer Alfred Büchi. Switzerland (English pronunciation; Schweiz Swiss German: Schwyz or Schwiiz Suisse Svizzera Svizra officially the Swiss Confederation His patent for a turbo charger was applied for use in 1905. [1] Diesel ships and locomotives with turbochargers began appearing in the 1920s. Diesel or Diesel fuel (ˈdiːzəl in general is any Fuel used in Diesel engines The most common is a specific fractional distillate of petroleum
Aviation
One of the first applications of a turbocharger to a non-Diesel engine came when General Electric engineer Sanford Moss attached a turbo to a V12 Liberty aircraft engine. V12 redirects here For the V12 Training program see V-12 Navy College Training Program. See also Liberty L-8 for the eight-cylinder prototype & Lincoln Liberty engine WikipediaWikiProject Aircraft The engine was tested at Pikes Peak in Colorado at 14,000 feet (4,300 m) to demonstrate that it could eliminate the power losses usually experienced in internal combustion engines as a result of reduced air pressure and density at high altitude. Pikes Peak (originally Pike's Peak, see below) is a Mountain in the Front Range of the Rocky Mountains, west of Colorado Springs The State of Colorado ( or chiefly by nonresidents) is a state located in the Rocky Mountain region of the United States of America.
Turbochargers were first used in production aircraft engines in the 1930s before World War II. World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including The primary purpose behind most aircraft-based applications was to increase the altitude at which the airplane can fly, by compensating for the lower atmospheric pressure present at high altitude. Aircraft such as the Lockheed P-38, Boeing B-17 Flying Fortress and Republic P-47 all used turbochargers to increase high altitude engine power. WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout It is important to note that the majority of turbocharged aircraft engines of World War II vintage used both a gear-driven second stage centrifugal type supercharger and a first stage turbocharger. The centrifugal-type supercharger is an engine-driven compressor used to increase the power output of an Internal-combustion engine by increasing the amount of available
Automobile
The first Turbo-Diesel truck was produced by the "Schweizer Maschinenfabrik Saurer" (Swiss Machine Works Saurer) 1938 [1]. The turbocharger hit the automobile world in 1952 when Fred Agabashian qualified for pole position at the Indianapolis 500 and led for 100 miles (160 km) before tire shards disabled the compressor. Fred Agabashian ( 21 August 1913 Modesto California &ndash 13 October 1989 Alamo California) was an American The Indianapolis 500-Mile Race, often shortened to Indianapolis 500 or Indy 500, and historically known simply as "The 500" is an American
The first production turbocharged automobile engines came from General Motors in 1962. General Motors Corporation ( GM) ( is a multinational automobile manufacturer founded in 1908 and headquartered in the United States. The A-body Oldsmobile Cutlass Jetfire and Chevrolet Corvair Monza Spyder were both fitted with turbochargers. The General Motors A platform (commonly called A-body) was a Mid-size car Automobile platform. The Oldsmobile Cutlass was an Automobile made by the Oldsmobile division of General Motors. The Chevrolet Corvair was an Automobile produced by the Chevrolet division of General Motors from 1959 to 1969 for the 1960&ndash1969 Model The Oldsmobile is often recognized as the first, since it came out a few months earlier than the Corvair. Its Turbo Jetfire was a 215 in³ (3. The Oldsmobile Rocket V8 was the first post-war OHV V8 at General Motors. 5 L) V8, while the Corvair engine was either a 145 in³ (2. A V8 engine is a V engine with eight cylinders mounted on the Crankcase in two banks of four cylinders in most cases set at a right angle to each other The Chevrolet Corvair engine was a Flat-6 (or Boxer engine) Piston engine used exclusively in the 1960s Chevrolet Corvair automobile 3 L)(1962-63) or a 164 in³ (2. 7 L) (1964-66) flat-6. flat-6 or horizontally-opposed-6 is a Flat engine with six Cylinders arranged horizontally in two banks of three cylinders on each side of a central Both of these engines were abandoned within a few years, and GM's next turbo engine came more than ten years later.
Offenhauser's turbocharged engines returned to Indianapolis in 1966, with victories coming in 1968. Offenhauser was a racing engine manufacturer that operated from 1933 to 1983 The Offenhauser turbo peaked at over 1,000 hp (750 kW) in 1973, while Porsche dominated the Can-Am series with a 1,100 hp (820 kW) 917/30. Porsche SE or Porsche ( German, ˈpɔɹʃə is a German manufacturer of automobiles which is majority-owned by the Porsche and Piëch The Canadian-American Challenge Cup or Can-Am, was an SCCA / CASC Sports car racing series from 1966 to 1974 The Porsche 917 is a racecar that gave Porsche its first overall wins at the 24 Hours of Le Mans in 1970 and 1971. Turbocharged cars dominated the Le Mans between 1976 and 1988, and then from 2000-2007. The 24 Hours of Le Mans ( 24 Heures du Mans) is a sports car endurance race held annually since near the town of Le Mans, Sarthe,
BMW led the resurgence of the automobile turbo with the 1973 2002 Turbo, with Porsche following with the 911 Turbo, introduced at the 1974 Paris Motor Show. ( BMW) (Bavarian Motor Works is an independent German automobile manufacturer founded in 1916 The BMW New Class (German Neue Klasse) was a line of compact sedans produced by the German automaker BMW and launched with the 1962 1500 The Porsche 911 (pronounced as Nine Eleven, Neunelfer is a Sports car made by Porsche AG of Stuttgart, Germany Buick was the first GM division to bring back the turbo, in the 1978 Buick Regal, followed by the Mercedes-Benz 300SD and Saab 99 in 1978. The Buick Regal is a Mid-size car produced by General Motors ' Buick division from 1973 through 2004 during which Buick also used the Century Mercedes-Benz is a German manufacturer of luxury Automobiles Buses coaches and Trucks It is currently a division of the The 99 is an Automobile produced by Saab from 1968 to 1984 Development On April 2, 1965, Gudmund's day in Japanese manufacturers and Ford followed suit, with Mitsubishi Lancer in 1978, Ford Mustang in 1979, Audi Quattro in 1980, Toyota Supra in 1980, Nissan 280ZX in 1982 and Mazda RX-7 in 1987. Japan is the world's largest Automobile manufacturer and exporter by number of vehicles manufactured in a year and has three of the world's ten largest automobile manufacturers Ford Motor Company is an American Multinational corporation and the world's fourth largest automaker based on Worldwide vehicle sales, following The Mitsubishi Lancer is a semi-luxury vehicle built by Mitsubishi Motors. The Ford Mustang sports coupe, manufactured by the Ford Motor Company, was initially based on the Ford Falcon The Audi Quattro is a notable road and rally car, produced by the German automobile manufacturer Audi, part of the then Volkswagen Group Mark I (1979-1981 1979 In 1978 Toyota began production of the Mark I Supra in Japan, as the Toyota Celica XX. The Nissan 280ZX (also known as the Datsun 280ZX) was a sports Coupe produced from 1978 to 1983 The Mazda RX-7 is a Sports car produced by the Japanese automaker Mazda from 1978 to 2002
The world's first production turbodiesel automobile was also introduced in 1978 by Mercedes-Benz with the launch of the 300SD turbodiesel. Mercedes-Benz is a German manufacturer of luxury Automobiles Buses coaches and Trucks It is currently a division of the Today, nearly all automotive diesels are turbocharged.
Alfa Romeo introduced the first mass-produced Italian turbocharged car, the Alfetta GTV 2000 Turbodelta in 1979. Alfa Romeo Automobiles SpA is an Italian Automaker founded in 1910 Pontiac also introduced a turbo in 1980 and Volvo Cars followed in 1981. Pontiac is a Brand of Automobiles produced by General Motors that has been sold in the United States, Canada and Mexico Volvo Cars, or Volvo Personvagnar AB, is a Swedish premium Automobile maker founded in 1927 in the city of Gothenburg in Sweden Maserati in 1980 was the first to introduce twin or bi-turbo Maserati Biturbo. Maserati is an Italian manufacturer of racing cars and Sports cars established on December 1, 1914, in Bologna. The Maserati Biturbo is a Sports car introduced by Maserati in 1981 Renault however gave another step and installed a turbocharger to the smallest and lightest car they had, the R5, making it the first Supermini automobile with a turbocharger in year 1980. This is about the company for other uses see Renault (disambiguation. The Renault 5 (also called the R5 was a supermini produced by the French automaker Renault in two generations between 1972 and 1996 A supermini is a British Car classification term that describes Automobiles larger than a City car but smaller than a Small family car. This gave the car about 160 bhp (120 kW) in street form and up to 300+ in race setup, which was extraordinary output for a 1400 cc motor. The R5's powerful motor was complemented by an incredible lightweight chassis, and as a consequence it was possible for an R5 to nip at the heels of the quick Italian sports car Ferrari 308.
Competition cars
In Formula One, in the so called "Turbo Era" of 1977 until 1989, engines with a capacity of 1500 cc could achieve anywhere from 1000 to 1500 hp (746 to 1119 kW) (Renault, Honda, BMW, Ferrari). The 1977 Formula One season included the 28th FIA Formula One World Championship season which commenced on January 9, 1977, and ended on The 1989 Formula One season was the 40th FIA Formula One World Championship season 1970s and 1980s 1977 Renault first involvement in Formula One was made by the Renault Sport subsidiary Honda Racing F1 Team is a Formula One team run by Japanese car manufacturer Honda. ( BMW) (Bavarian Motor Works is an independent German automobile manufacturer founded in 1916 Ferrari SpA is an Italian Sports car manufacturer based in Maranello, Italy Renault was the first manufacturer to apply turbo technology in the F1 field, in 1977. The project's high cost was compensated for by its performance, and led to other engine manufacturers following suit. The Turbo-charged engines took over the F1 field and ended the Ford Cosworth DFV era in the mid 1980s. The DFV was an Engine produced by Cosworth originally for Formula One motor racing However, the FIA decided that turbos were making the sport too dangerous and expensive, and from 1987 onwards, the maximum boost pressure was reduced before the technology was banned completely for 1989. The 1987 Formula One season was the 38th FIA Formula One World Championship season The 1989 Formula One season was the 40th FIA Formula One World Championship season
In Rallying, turbocharged engines of up to 2000 cc have long been the preferred motive power for the Group A/NWorld Rally Car (top level) competitors, due to the exceptional power-to-weight ratios (and enormous torque) attainable. Rallying is a form of motor competition that takes place on public or private roads with modified production or specially built road-legal cars The WRc Group is a privately-owned group of companies providing research and consultancy on water supply waste treatment and the public This combines with the use of vehicles with relatively small bodyshells for manoeuvreability and handling. As turbo outputs rose to similar levels as the F1 category (see above), the FIA, rather than banning the technology, enforced a restricted turbo inlet diameter (currently 34 mm), effectively "starving" the turbo of compressible air and making high boost pressures unfeasible.
The success of small, turbocharged, four-wheel-drive vehicles in rally competition began with Audi Quattro. Four-wheel drive, 4WD, or 4x4 ("four by four" is a four-wheeled Vehicle with a drivetrain that allows all four Wheels to The Audi Quattro is a notable road and rally car, produced by the German automobile manufacturer Audi, part of the then Volkswagen Group In 1981 Audi entered the FIA championship with 4 podium finishes that year, and a manufacturers title in 1982 (2nd and 3rd for driver championship). The advantages of turbochargers combined with all wheel drive were clear, and led to the production of many other similar rally cars including the; Peugeot 205 T16, the Renault 5 Turbo, the Lancia Delta S4 and the Mazda 323GTX, has led to exceptional road cars in the modern era such as the Lancia Delta Integrale, Toyota Celica GT-Four, Subaru Impreza WRX and the Mitsubishi Lancer Evolution. The Peugeot 205 is a supermini produced by the French car manufacturer Peugeot between 1983 and 1997 The Renault 5 Turbo or R5 Turbo is a high-performance Hatchback Automobile that was produced by the French manufacturer Renault The Lancia Delta S4 is a Group B Rally car that competed in the World Rally Championship in 1985 and 1986, until Group The Mazda Familia is a long-running nameplate used by Mazda for their Small family cars manufactured between 1964 and 2003 with 10589052 sold worldwide Lancia Delta S4The Lancia Delta is a Small family car produced by Italian automaker Lancia with the first generation being produced between 1979 and 1994 the second The Toyota Celica GT-Four is a high performance model of the Celica liftback with a Turbocharged 3S-GTE engine and full-time 4WD. The Subaru Impreza WRX, is a turbocharged version of the Subaru Impreza, an All-wheel drive automobile The Mitsubishi Lancer Evolution, colloquially known as the Lancer Evo, or Evo, is a car manufactured by Mitsubishi Motors.
In the late 1970s, Ford and GM looked to the turbocharger to gain power, without sacrificing fuel consumption, during not only the emissions crunch of the federal government but also a gas shortage. GM released turbo versions of the Pontiac Firebird, Buick Regal, and Chevy Monte Carlo. Ford responded with a turbocharged Mustang in the form of the 2. 3L from the Pinto. The engine design was dated, but it worked well. The bullet-proof 2. 3L Turbo was used in early carburated trim as well as fuel injected and intercooled versions in the Mustang SVO and the Thunderbird Turbo Coupe until 1988. The Mustang SVO was a limited-production version of the Ford Mustang sold from 1984 to 1986, during which time it was the fastest most expensive version The Thunderbird is an automobile manufactured by Ford in the United States from 1955 through 2005 &mdash through thirteen generations and various GM also liked the idea enough to evolve the 3. 8L V6 used in early turbo Buicks into late '80s muscle in the form of the Buick Grand National and its pinnacle (and final) form, the GNX.
Although late to use turbocharging, Chrysler Corporation, after some joint development with Maserati (Chrysler TC), turned to turbochargers in 1984 and quickly churned out more turbocharged engines than any other manufacturer, using turbocharged, fuel-injected 2. Chrysler LLC is an American Automobile manufacturer that has been producing Automobiles since 1925 Maserati is an Italian manufacturer of racing cars and Sports cars established on December 1, 1914, in Bologna. The Chrysler TC by Maserati was a Chrysler K platform GT car jointly developed by Chrysler and Maserati. 2 and 2. 5 litre four-cylinder engines in minivans, sedans, convertibles, and coupes. Their 2. 2 litre turbocharged engines ranged from 142 hp (106 kW) to 225 hp (168 kW), a substantial gain over the normally aspirated ratings of 86 to 93 horsepower (69 kW); the 2. 5 litre engines had about 150 horsepower (110 kW) and had no intercooler. An intercooler, or Charge air cooler, is an air-to-air or air-to-liquid heat exchange device used on turbocharged and supercharged (forced They also pioneered variable geometry turbocharging,(an industry first) with the introduction of the Dodge based 1989 Shelby CSX, a system that completely eliminated "turbo lag". Though the company stopped using turbochargers in 1993,they returned to turbocharged engines in 2002 with their 2. 4 litre engines, boosting output by 70 horsepower. [2]
Design details
Components
The turbocharger has four main components. The turbine and impeller/compressor wheels are each contained within their own folded conical housing on opposite sides of the third component, the center housing/hub rotating assembly (CHRA). A turbine is a rotary Engine that extracts Energy from a Fluid flow An impeller is a rotor inside a tube or conduit to increase the pressure and flow of a fluid
The housings fitted around the compressor impeller and turbine collect and direct the gas flow through the wheels as they spin. The size and shape can dictate some performance characteristics of the overall turbocharger. The area of the cone to radius from center hub is expressed as a ratio (AR, A/R, or A:R). Often the same basic turbocharger assembly will be available from the manufacturer with multiple AR choices for the turbine housing and sometimes the compressor cover as well. This allows the designer of the engine system to tailor the compromises between performance, response, and efficiency to application or preference. Both housings resemble snail shells, and thus turbochargers are sometimes referred to in slang as snails. The word snail is a Common name that can be used for almost all members of the Molluscan class Gastropoda which have coiled shells in the Slang is the use of highly informal Words and expressions that are not considered standard in the speaker's Dialect or Language.
Split-Inlet Exhaust Housings known as "Twin Scroll" permit the exhaust pulses to be grouped (or separated) by cylinder all the way to the turbine. The reason for doing this in keeping the individual package of energy, an exhaust pulse, intact and undisturbed by other pulses, all the way to the turbine. This causes the exhaust turbine to see peak, rather than average, pulse pressures. This is specifically useful in four-cylinder engines. Because a four-cylinder only sees one pulse every 180 degrees of crank rotation, it needs all the energy it can get from each pulse. Keeping them separate and undisturbed will therefore pay back some dividends. 5* (Information from "Maximum Boost" by Corky Bell).
The turbine and impeller wheel sizes also dictate the amount of air or exhaust that can be flowed through the system, and the relative efficiency at which they operate. Generally, the larger the turbine wheel and compressor wheel, the larger the flow capacity. Measurements and shapes can vary, as well as curvature and number of blades on the wheels.
The center hub rotating assembly houses the shaft which connects the compressor impeller and turbine. It also must contain a bearing system to suspend the shaft, allowing it to rotate at very high speed with minimal friction. For instance, in automotive applications the CHRA typically uses a thrust bearing or ball bearing lubricated by a constant supply of pressurized engine oil. The CHRA may also be considered "water cooled" by having an entry and exit point for engine coolant to be cycled. Water cooled models allow engine coolant to be used to keep the lubricating oil cooler, avoiding possible oil coking from the extreme heat found in the turbine. Coke is a solid Carbonaceous material derived from Destructive distillation of low-ash low-sulfur Bituminous coal.
Boost
Boost refers to the increase in manifold pressure that is generated by the turbocharger in the intake path or specifically intake manifold that exceeds normal atmospheric pressure. The examples and descriptions in this article apply strictly to Four-stroke cycle gasoline engines An intake, or especially for aircraft inlet, is an air intake for an Engine. In Automotive engineering, an intake manifold or inlet manifold is the part of an Engine that supplies the Fuel / Air mixture to Atmospheric pressure is 14. 7psi or 1. 0 Bar. Anything that hits positive PSI will be considered boost. This is also the level of boost as shown on a pressure gauge, usually in bar, psi or possibly kPa. Many techniques have been developed for the measurement of Pressure and Vacuum. The bar (symbol bar) decibar (symbol dbar) and the millibar (symbol mbar, also mb are units of Pressure. The pound per square inch or more accurately pound-force per square inch (symbol psi or lbf/in² or lbf/in²) is a unit of This is representative of the extra air pressure that is achieved over what would be achieved without the forced induction. Forced induction is a term used to describe Internal combustion engines that are not naturally aspirated. Manifold pressure should not be confused with the volume of air that a turbo can flow.
Boost pressure is limited to keep the entire engine system, including the turbo, inside its thermal and mechanical design operating range by controlling the wastegate which shunts the exhaust gases away from the exhaust side turbine. A wastegate is a Valve that diverts Exhaust gases away from the Turbine wheel in a Turbocharged engine system
The maximum possible boost depends on the fuel's octane rating and the inherent tendency of any particular engine towards preignition. The octane rating is a measure of the resistance of Gasoline and other Fuels to Detonation ( Engine knocking) in spark-ignition Knocking (also called knock, detonation or spark knock, pinking in UK English or pinging in US English in spark-ignition With appropriate calibration and efficient charge cooling, relatively high boost pressures can safely be attained. Ethanol, methanol, liquefied petroleum gas (LPG) and diesel fuels allow higher boost than gasoline, because of these fuels' combustion characteristics. Methanol, also known as methyl alcohol, carbinol, wood alcohol, wood naphtha or wood spirits, is a Chemical compound Liquefied petroleum gas (also called LPG, GPL, LP Gas, or Autogas) is a mixture of Hydrocarbon Gases used as a Fuel Diesel or Diesel fuel (ˈdiːzəl in general is any Fuel used in Diesel engines The most common is a specific fractional distillate of petroleum Race fuel can be used such as c-16 that has a octane rating of 117. To obtain high boost levels, all elements have to be upgraded such as larger fuel pump, bigger injectors, lower compression, right air/fuel ratio, and head-gasket.
Wastegate
By spinning at a relatively high speed the compressor turbine draws in a large volume of air and forces it into the engine. As the turbocharger's output flow volume exceeds the engine's volumetric flow, air pressure in the intake system begins to build. The examples and descriptions in this article apply strictly to Four-stroke cycle gasoline engines An intake, or especially for aircraft inlet, is an air intake for an Engine. The speed at which the assembly spins is proportional to the pressure of the compressed air and total mass of air flow being moved. Since a turbo can spin to RPMs far beyond what is needed, or of what it is safely capable of, the speed must be controlled. A wastegate is the most common mechanical speed control system, and is often further augmented by an electronic or manual boost controller. A wastegate is a Valve that diverts Exhaust gases away from the Turbine wheel in a Turbocharged engine system Boost control is the principle of controlling the boost level produced in the Intake manifold of a turbocharged or supercharged engine by affecting The main function of a wastegate is to allow some of the exhaust to bypass the turbine when the set intake pressure is achieved. Passenger cars have wastegates that are integral to the turbocharger.
Anti-Surge/Dump/Blow Off Valves
Turbo charged engines operating at wide open throttle and high rpm require a large volume of air to flow between the turbo and the inlet of the engine. When the throttle is closed compressed air will flow to the throttle valve without an exit (i. e. the air has nowhere to go).
This causes a surge which can raise the pressure of the air to a level which can be destructive to the engine (e. g. damage may occur to the throttle plate, induction pipes may burst. ) The surge will also decompress back across the turbo as this is the only path that the air can take. This sudden flow of air will often cause turbulence and a subsequent whistling noise as the air moves past the compressor wheel.
The reverse flow back across the turbo acts on the compressor wheel and causes the turbine shaft to reduce in speed quicker than it would naturally. When the throttle is opened again, the turbo will have to make up for lost momentum and will take longer to achieve the required speed, as turbo speed is proportional to boost/volume flow. (This is known as Turbo Lag) In order to prevent this from happening, a valve is fitted between the turbo and inlet which vents off the excess air pressure. These are known as an anti-surge, bypass, blow-off (BOV) or dump valve. Dump valves are fitted to the engines of turbo charged cars and sit between the turbo outlet and the throttle body They are normally operated by engine vacuum.
The primary use of this valve is to maintain the turbo spinning at a high speed. The air is usually recycled back into the turbo inlet but can also be vented to the atmosphere. Recycling back into the turbo causes the venting sound to be reduced and is required on an engine that uses a mass-airflow fuel injection system (as opposed to a speed-density system). The reason for this is that the airflow sensor is normally located before the turbo and the ECU will inject enough fuel for the amount of air that flows through it. If some of the air that has gone through the sensor is dumped into the atmosphere, the engine will be over fueled until the BOV closes again. The benefits of venting to the atmosphere are simply the ease of installation (because there is no need to run an extra hose to plumb the charge back into the system) and that it makes a sound considered desirable by some. A dump valve will shorten the time needed to respool the turbo after sudden engine deceleration.
Since a turbocharger increases the specific horsepower output of an engine, the engine will also produce increased amounts of heat. In Physics, heat, symbolized by Q, is Energy transferred from one body or system to another due to a difference in Temperature This can sometimes be a problem when fitting a turbocharger to a motor that was not designed to cope with high heat loads.
It is another form of cooling that has the largest impact on fuel efficiency: charge cooling. Even with the benefits of intercooling, the total compression in the combustion chamber is greater than that in a naturally-aspirated engine. An intercooler, or Charge air cooler, is an air-to-air or air-to-liquid heat exchange device used on turbocharged and supercharged (forced A combustion chamber is the part of an Engine in which Fuel is burned A naturally-aspirated engine or normally-aspirated engine (or "N/A" - Aspiration meaning breathing refers to an Internal combustion engine To avoid knock while still extracting maximum power from the engine, it is common practice to introduce extra fuel into the charge for the sole purpose of cooling. Knocking (also called knock, detonation or spark knock, pinking in UK English or pinging in US English in spark-ignition While this seems counterintuitive, this fuel is not burned. Instead, it absorbs and carries away heat when it changes phase from liquid mist to gas vapor. Also, because it is more dense than the other inert substance in the combustion chamber, nitrogen, it has a higher specific heat and more heat capacitance. Nitrogen (ˈnaɪtɹəʤɪn is a Chemical element that has the symbol N and Atomic number 7 and Atomic weight 14 It "holds" this heat until it is released in the exhaust stream, preventing destructive knock. Exhaust gas is Flue gas which occurs as a result of the Combustion of fuels such as Natural gas, Gasoline /petrol Diesel, Fuel Knocking (also called knock, detonation or spark knock, pinking in UK English or pinging in US English in spark-ignition This thermodynamic property allows manufacturers to achieve good power output with common pump fuel at the expense of fuel economy and emissions. The stoichiometric Air-to-Fuel ratio (A/F) for combustion of gasoline is 14. Stoichiometry (sometimes called reaction stoichiometry to distinguish it from composition stoichiometry is the Calculation of Quantitative (measurable 7:1. A common A/F in a turbocharged engine while under full design boost is approximately 12:1. Richer mixtures are sometimes run when the design of the system has flaws in it such as a catalytic converter which has limited endurance of high exhaust temperatures or the engine has a compression ratio that is too high for efficient operation with the fuel given. An engine that requires an overly rich fuel mixture is an indication of a poorly engineered turbo system.
Turbochargers also provide more direct fuel savings when compared to a supercharger. The volume, speed and pressure of exhaust gases flowing out of the engine are not only related to engine speed, but also to engine load. An engine under a heavy load has higher internal pressures and temperatures than an engine running under a light load at the same speed. This effect is found on all internal combustion engines, but is especially true for diesel engines. A diesel engine is an Internal combustion engine which operates using the Diesel cycle (named after Dr Because the turbocharger is connected to the engine's fuel system, which regulates the supply of fuel in relation to the boost being generated, extra fuel is only delivered when the engine is under load and boost pressures are high. A vehicle with a turbocharged engine travelling at a constant speed on a flat road is placing a relatively small load on its engine- exhaust pressure, boost and fuel delivery is therefore low, and fuel consumption will be close to that of a naturally-aspirated vehicle. The same vehicle maintaining the same speed up a hill will place the engine under a greater load, generating a greater exhaust pressure, raising turbocharger speed, increasing boost pressure and thus causing more fuel to be delivered and more power to be produced. Because boost is related to engine load, the turbocharger only runs at full capacity when the engine is under load. A supercharger, directly geared to the engine, has boost relating solely to engine speed, resulting in higher fuel consumption.
Lastly, the efficiency of the turbocharger itself can have an impact on fuel efficiency. Using a small turbocharger will give quick response and low lag at low to mid RPMs, but can choke the engine on the exhaust side and generate huge amounts of pumping-related heat on the intake side as RPMs rise. A large turbocharger will be very efficient at high RPMs, but is not a realistic application for a street driven automobile. Variable vane and ball bearing technologies can make a turbo more efficient across a wider operating range, however, other problems have prevented this technology from appearing in more road cars (see Variable geometry turbocharger). Variable geometry turbocharger s ( VGT s are a family of Turbochargers usually designed to allow the effective Aspect ratio (sometimes called A/R Ratio of Currently, the Porsche 911 (997) Turbo is the only gasoline car in production with this kind of turbocharger, although in Europe turbos of this type are rapidly becoming standard-fitment on turbodiesel cars, vans and other commercial vehicles, because they can greatly enhance the diesel engine's characteristic low-speed torque. The Porsche Type 997, or simply 997 is the Project code name for the current version of the Sports car Porsche 911, built by the German Turbodiesel refers to any Diesel engine with a Turbocharger. Turbocharging is the norm rather than the exception in modern car and truck diesel engines A diesel engine is an Internal combustion engine which operates using the Diesel cycle (named after Dr One way to take advantage of the different operating regimes of the two types of supercharger is sequential turbocharging, which uses a small turbocharger at low RPMs and a larger one at high RPMs. Twin-turbo refers to a turbocharged engine on which two turbochargers compress the intake charge
The engine management systems of most modern vehicles can control boost and fuel delivery according to charge temperature, fuel quality, and altitude, among other factors. A turbocharger, or turbo, is an air Compressor used for forced-induction of an Internal combustion engine. Some systems are more sophisticated and aim to deliver fuel even more precisely based on combustion quality. For example, the Trionic-7 system from Saab Automobile provides immediate feedback on the combustion while it is occurring by using the spark plug to measure the cylinder pressure via the ionization voltage over the spark plug gap. Saab Automobile AB, better known as Saab, is a Swedish car manufacturer and currently a wholly-owned Subsidiary of General Motors.
The new 2. 0L TFSI turbo engine from Volkswagen/Audi incorporates lean burn and direct injection technology to conserve fuel under low load conditions. Gasoline direct injection is a latest variant of Fuel injection employed in modern two- and four- stroke Petrol engines The petrol/gasoline AUDI AG, ( Xetra: NSU commonly known as Audi (aˈʊdi is a German Automobile manufacturer which produces Audi branded cars with headquarters It is a very complex system that involves many moving parts and sensors in order to manage airflow characteristics inside the chamber itself, allowing it to use a stratified charge with excellent atomization. The direct injection also has a tremendous charge cooling effect enabling engines to use higher compression ratios and boost pressures than a typical port-injection turbo engine.
Automotive design details
The ideal gas law states that when all other variables are held constant, if pressure is increased in a system so will temperature. The ideal gas law is the Equation of state of a hypothetical Ideal gas, first stated by Benoît Paul Émile Clapeyron in 1834 Here exists one of the negative consequences of turbocharging, the increase in the temperature of air entering the engine due to compression.
A turbo spins very fast; most peak between 20,000 and 100,000 RPM (using low inertia turbos, 150,000-250,000 RPM) depending on size, weight of the rotating parts, boost pressure developed and compressor design. The vis insita or innate force of matter is a power of resisting by which every body as much as in it lies endeavors to preserve in its present state whether it be of rest or of moving Such high rotation speeds would cause problems for standard ball bearings leading to failure so most turbo-chargers use fluid bearings. A ball bearing is an engineering term referring to a type of Rolling-element bearing which uses Balls to maintain the separation between the moving parts Fluid bearings are bearings which solely support the bearing's loads on a thin layer of liquid or gas These feature a flowing layer of oil that suspends and cools the moving parts. The oil is usually taken from the engine-oil circuit. Some turbochargers use incredibly precise ball bearings that offer less friction than a fluid bearing but these are also suspended in fluid-dampened cavities. Lower friction means the turbo shaft can be made of lighter materials, reducing so-called turbo lag or boost lag. Some car makers use water cooled turbochargers for added bearing life. This can also account for why many tuners upgrade their standard journal bearing turbos (such as a T25) which use a 270 degree thrust bearing and a brass journal bearing which has only 3 oil passages, to a 360 degree bearing which has a beefier thrust bearing and washer having 6 oil passages to enable better flow, response and cooling efficiency. Turbochargers with foil bearings are in development which eliminates the need for bearing cooling or oil delivery systems, thereby eliminating the most common cause of failure, while also significantly reducing turbo lag. Foil bearings are a type of air bearing. A shaft is supported by a compliant spring loaded foil journal lining
To manage the upper-deck air pressure, the turbocharger's exhaust gas flow is regulated with a wastegate that bypasses excess exhaust gas entering the turbocharger's turbine. A wastegate is a Valve that diverts Exhaust gases away from the Turbine wheel in a Turbocharged engine system This regulates the rotational speed of the turbine and the output of the compressor. The wastegate is opened and closed by the compressed air from turbo (the upper-deck pressure) and can be raised by using a solenoid to regulate the pressure fed to the wastegate membrane. A solenoid is a three-dimensional Coil. In Physics, the term solenoid refers to a loop of wire often wrapped around a Metallic core which This solenoid can be controlled by Automatic Performance Control, the engine's electronic control unit or an after market boost control computer. Automatic Performance Control (APC was the first engine knock and boost control system that was introduced on turbo charged Saab H engines in 1982 and was In automotive electronics an electronic control unit (ECU also called a Control unit, or Control module, is an Embedded system that controls one or more Another method of raising the boost pressure is through the use of check and bleed valves to keep the pressure at the membrane lower than the pressure within the system.
Some turbochargers, called Variable-Geometry or Variable-Nozzle turbos, use a set of vanes in the exhaust housing to maintain a constant gas velocity across the turbine, the same kind of control as used on power plant turbines. Variable geometry turbocharger s ( VGT s are a family of Turbochargers usually designed to allow the effective Aspect ratio (sometimes called A/R Ratio of Other designations for this type of turbo include Variable Area Turbine Nozzle, Variable Turbine Geometry, and Variable Vane Turbine. Such turbochargers have minimal lag like a small conventional turbocharger and can achieve full boost as low as 1,500 engine rpm, yet remain efficient as a large conventional turbocharger at higher engine speeds; they are also used in diesel engines. [3] In many setups these turbos do not use a wastegate; the vanes are controlled by a membrane identical to the one on a wastegate but the mechanism is different.
The first production car to use a variable-nozzle turbos was the limited-production 1989 Shelby CSX-VNT equipped with a 2. The Shelby CSX (Carrol Shelby experimental was a limited-production high performance Automobile based on the turbocharged Dodge Shadow. 2L petrol engine. A Petrol engine or Gasoline engine is an Internal combustion engine with spark-ignition designed to run on petrol ( Gasoline) and similar volatile The Shelby CSX-VNT uses a Garrett turbo designated VNT-25, a variable-geometry version of Garrett's T-25. Garrett by Honeywell is the consumer brand of Honeywell Turbo Technologies a subsidiary of Honeywell Corporation. This type of turbine is called a Variable Nozzle Turbine (VNT). A number of other Chrysler Corporation vehicles used this turbocharger in 1990, including the Dodge Daytona and Dodge Shadow. Chrysler LLC is an American Automobile manufacturer that has been producing Automobiles since 1925 This page is about the 1980s and 1990s Daytona For information on the Charger Daytona, see this page. For 1987 Chrysler Corporation introduced two new Compact cars the Dodge Shadow and the Plymouth Sundance (which turned in similar These engines produced 174 horsepower (130 kW) and 225 foot-pounds force (305 N·m) of torque, the same horsepower as the standard intercooled 2. 2 liter engines but with 25 more pound-feet of torque and greatly reduced turbo lag.
The 2006 Porsche 911 Turbo has a twin turbocharged 3. The Porsche Type 997, or simply 997 is the Project code name for the current version of the Sports car Porsche 911, built by the German 6-litre flat six, and the turbos used are BorgWarner's Variable Geometry Turbos (VGTs). This is the third time the technology has been implemented on a production petrol car, after the 1989-90 Chrysler Corporation vehicles and the 1992 Peugeot 405 T16.
Volkswagen has used Garrett's VNT turbos on the TDI engines of the Mark III and Mark IV series Golf (or Bora) and Jetta (or Vento). The VNT turbos allow the characteristic low-end torque of the diesel engine to be enhanced utilized while also providing extra horsepower often lacking on diesel engines.
Motorcycles
Using turbochargers to gain performance without a large gain in weight was very appealing to the Japanese factories in the 1980s. The first example of a turbocharged bike is the 1978 Kawasaki Z1R TC. ( is an international corporation based in Japan. It has headquarters in both Chūō-ku, Kobe and Minato Tokyo. It used a Rayjay ATP turbo kit to build 5 lb (2. 3 kg) of boost, bringing power up from ~90 hp to ~105 hp. However, it was only marginally faster than the standard model (11 lb and 145 hp (108 kW) with a modified wastegate). A US Kawasaki importer came up with the idea of modifying the Z1-R with a turbocharging kit as a solution to the Z1-R being a low selling bike. In 1982 Honda released the CX500T featuring a carefully developed turbo (as oppose to the Z1-R's bolt on approach). The Honda CX series motorcycles (including the GL500 and GL650 variants were developed and released in the late 1970s with production ending in most markets by the mid 1980s The development of the CX500T was riddled with problems; due to being a V-twin engine the intake periods in the engine rotation are staggered leading to periods of high intake and long periods of no intake at all. Configurations "True V-twin" vs V-2 There is some ambiguity regarding what defines a V-twin which arose from 180 degree "V" engines (see Designing around these problems increased the price of the bike, and the performance still was not as good as the cheaper CX900, making turbocharging motorcycles from factory an educational experience; as of 2007 no factories offer turbocharged motorcycles (although the Suzuki B-King prototype featured a supercharged Hayabusa engine). Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. is a Multinational corporation headquartered in Hamamatsu Japan that specializes in manufacturing compact automobiles a full range of Motorcycles All-Terrain The Suzuki Hayabusa (also known as the GSX1300R in some countries is a Hyper sport motorcycle originally introduced by Suzuki in 1999
Properties and applications
Reliability
Turbochargers can be damaged by dirty or ineffective oil, and most manufacturers recommend more frequent oil changes for turbocharged engines. Many owners and some companies recommend using synthetic oils, which tend to flow more readily when cold and do not break down as quickly as conventional oils. Synthetic oil is Oil consisting of Chemical compounds which were not originally present in Crude oil ( Petroleum) but were Artificially Because the turbocharger will heat when running, many recommend letting the engine idle for one to three minutes before shutting off the engine if the turbocharger was used shortly before stopping (most manufacturers specify a 10-second period of idling before switching off to ensure the turbocharger is running at its idle speed to prevent damage to the bearings when the oil supply is cut off). This lets the turbo rotating assembly cool from the lower exhaust gas temperatures, and ensures that oil is supplied to the turbocharger while the turbine housing and exhaust manifold are still very hot; otherwise coking of the lubricating oil trapped in the unit may occur when the heat soaks into the bearings, causing rapid bearing wear and failure when the car is restarted. Coke is a solid Carbonaceous material derived from Destructive distillation of low-ash low-sulfur Bituminous coal. Even small particles of burnt oil will accumulate and lead to choking the oil supply and failure. This problem is less pronounced in diesel engines, due to the lower exhaust temperatures and generally slower engine speeds. A diesel engine is an Internal combustion engine which operates using the Diesel cycle (named after Dr
A turbo timer can keep an engine running for a pre-specified period of time, to automatically provide this cool-down period. A turbo timer is a device designed to keep an automotive engine running for a pre-specified period of time in order to automatically execute the cool-down period required to Oil coking is also eliminated by foil bearings. Foil bearings are a type of air bearing. A shaft is supported by a compliant spring loaded foil journal lining A more complex and problematic protective barrier against oil coking is the use of watercooled bearing cartridges. The water boils in the cartridge when the engine is shut off and forms a natural recirculation to drain away the heat. Nevertheless, it is not a good idea to shut the engine off while the turbo and manifold are still glowing.
In custom applications utilizing tubular headers rather than cast iron manifolds, the need for a cooldown period is reduced because the lighter headers store much less heat than heavy cast iron manifolds. Cast iron usually refers to grey cast iron, but identifies a large group of Ferrous Alloys which solidify with a Eutectic.
Lag
A lag is sometimes felt by the driver of a turbocharged vehicle as a delay between pushing on the accelerator pedal and feeling the turbo kick-in. In Computing and especially Computer networks lag (slang is a symptom where the result of an action appears later than expected This is symptomatic of the time taken for the exhaust system driving the turbine to come to high pressure and for the turbine rotor to overcome its rotational inertia and reach the speed necessary to supply boost pressure. This article is about the moment of inertia of a rotating object. The directly-driven compressor in a supercharger does not suffer this problem. A supercharger is an air compressor used for Forced induction of an Internal combustion engine. (Centrifugal superchargers do not build boost at low RPMs like a positive displacement supercharger will). Conversely on light loads or at low RPM a turbocharger supplies less boost and the engine is less efficient than a supercharged engine.
Lag can be reduced by lowering the rotational inertia of the turbine, for example by using lighter parts to allow the spool-up to happen more quickly. Ceramic turbines are a big help in this direction. Unfortunately, their relative fragility limits the maximum boost they can supply. Another way to reduce lag is to change the aspect ratio of the turbine by reducing the diameter and increasing the gas-flow path-length. The aspect ratio of a Shape is the ratio of its longer Dimension to its shorter dimension Increasing the upper-deck air pressure and improving the wastegate response helps but there are cost increases and reliability disadvantages that car manufacturers are not happy about. A wastegate is a Valve that diverts Exhaust gases away from the Turbine wheel in a Turbocharged engine system Lag is also reduced by using a foil bearing rather than a conventional oil bearing. Foil bearings are a type of air bearing. A shaft is supported by a compliant spring loaded foil journal lining This reduces friction and contributes to faster acceleration of the turbo's rotating assembly. Variable-nozzle turbochargers (discussed above) eliminate lag.
Lag can be reduced with the use of multiple turbochargers. Another common method of equalizing turbo lag is to have the turbine wheel "clipped", or to reduce the surface area of the turbine wheel's rotating blades. By clipping a minute portion off the tip of each blade of the turbine wheel, less restriction is imposed upon the escaping exhaust gases. This imparts less impedance onto the flow of exhaust gases at low RPM, allowing the vehicle to retain more of its low-end torque, but also pushes the effective boost RPM to a slightly higher level. A torque (τ in Physics, also called a moment (of force is a pseudo- vector that measures the tendency of a force to rotate an object about The amount of turbine wheel clipping is highly application-specific. Turbine clipping is measured and specified in degrees.
Lag is not to be confused with the boost threshold; however, many publications still make this basic mistake. The boost threshold of a turbo system describes the minimum engine RPM at which there is sufficient exhaust flow to the turbo to allow it to generate significant amounts of boost. Newer turbocharger and engine developments have caused boost thresholds to steadily decline to where day-to-day use feels perfectly natural. Putting your foot down at 1200 engine RPM and having no boost until 2000 engine RPM is an example of boost threshold and not lag. If lag was experienced in this situation, the RPM would either not start to rise for a short period of time after the throttle was increased, or increase slowly for a few seconds and then suddenly build up at a greater rate as the turbo become effective. However, the term lag is used erroneously for boost threshold by many manufacturers themselves.
Electrical boosting ("E-boosting") is a new technology under development; it uses a high speed electrical motor to drive the turbocharger to speed before exhaust gases are available, e. g. from a stop-light. The electric motor is about an inch long. [3]
Race cars often utilize an Anti-Lag System to completely eliminate lag at the cost of reduced turbocharger life. Auto racing (also known as automobile racing, motor racing or car racing) is a Motorsport involving Racing Cars It
On modern diesel engines, this problem is virtually eliminated by utilizing a variable geometry turbocharger. A diesel engine is an Internal combustion engine which operates using the Diesel cycle (named after Dr Variable geometry turbocharger s ( VGT s are a family of Turbochargers usually designed to allow the effective Aspect ratio (sometimes called A/R Ratio of
Twin turbochargers
Parallel
Some engines, such as V-type engines, utilize two identically-sized but smaller turbos, each fed by a separate set of exhaust streams from the engine. Twin-turbo refers to a turbocharged engine on which two turbochargers compress the intake charge A V engine is a common configuration for an Internal combustion engine. The two smaller turbos produce the same (or more) aggregate amount of boost as a larger single turbo, but since they are smaller they reach their optimal RPM, and thus optimal boost delivery, faster. Such an arrangement of turbos is typically referred to as a parallel twin-turbo system. Twin-turbo refers to a turbocharged engine on which two turbochargers compress the intake charge
Sequential
Some car makers combat lag by using two small turbos (such as Nissan, Toyota, Subaru, Maserati, Mazda, and Audi). (pronounced) is a Multinational corporation headquartered in Japan, and is currently the world's largest Automaker. is the automobile manufacturing division of Japanese transportation conglomerate Fuji Heavy Industries Co Maserati is an Italian manufacturer of racing cars and Sports cars established on December 1, 1914, in Bologna. ( is a Japanese automotive manufacturer based in Hiroshima, Japan. AUDI AG, ( Xetra: NSU commonly known as Audi (aˈʊdi is a German Automobile manufacturer which produces Audi branded cars with headquarters A typical arrangement for this is to have one turbo active across the entire rev range of the engine and one coming on-line at higher RPM. Early designs would have one turbocharger active up to a certain RPM, after which both turbochargers are active. Below this RPM, both exhaust and air inlet of the secondary turbo are closed. Being individually smaller they do not suffer from excessive lag and having the second turbo operating at a higher RPM range allows it to get to full rotational speed before it is required. Such combinations are referred to as a sequential twin-turbo. Twin-turbo refers to a turbocharged engine on which two turbochargers compress the intake charge Sequential twin-turbos are usually much more complicated than a single or parallel twin-turbo systems because they require what amounts to three sets of pipes-intake and wastegate pipes for the two turbochargers as well as valves to control the direction of the exhaust gases. An example of this is the current BMW E60 5-Series 535d. The BMW E60 Automobile platform is the basis of the 2003-onwards 5-Series automobile replacing the BMW E39. The BMW 5 Series is a Mid-size Luxury car / Executive car manufactured by BMW since 1972 Another well-known example is the 1993-2002 Mazda RX-7. Many new diesel engines use this technology to not only eliminate lag but also to reduce fuel consumption and reduce emissions.
Boost Threshold
Turbochargers start producing boost only above a certain rpm (depending on the size of the turbo) because they are powered by the movement of exhaust gases; without an appropriate exhaust gas velocity, they logically cannot force air into the engine. The point at which the airflow in the exhaust is strong enough to force air into the engine is known as the boost threshold rpm. Engineers have, in some cases, been able to reduce the boost threshold rpm to idle speed to allow for instant response. .
Both Lag and Threshold characteristics can be acquired through the use of a compressor map using compressor map and a mathematical equation.
Automotive Applications
Turbocharging is very common on diesel engines in conventional automobiles, in trucks, locomotives, for marine and heavy machinery applications. A diesel engine is an Internal combustion engine which operates using the Diesel cycle (named after Dr This article is about the semi-truck For the North American use of the word see Pickup truck. A locomotive is a railway Vehicle that provides the motive power for a Train. In fact, for current automotive applications, non-turbocharged diesel engines are becoming increasingly rare. Diesels are particularly suitable for turbocharging for several reasons:
- Naturally-aspirated diesels will develop less power than a gasoline engine of the same size, and will weigh significantly more because diesel engines require heavier, stronger components. A naturally-aspirated engine or normally-aspirated engine (or "N/A" - Aspiration meaning breathing refers to an Internal combustion engine This gives such engines a poor power-to-weight ratio; turbocharging can dramatically improve this P:W ratio, with large power gains for a very small increase in weight. Power-to-weight ratio (specific power is a calculation commonly applied to Engines and other mobile power sources to enable the comparison of one unit or design to another
- Diesel engines require more robust construction because they already run at very high compression ratio and at high temperatures so they generally require little additional reinforcement to be able to cope with the addition of the turbocharger. The compression ratio is a single number that can be used to predict the performance of any engine particularly piston engines (but can be used on essentially any Internal-combustion Gasoline engines often require extensive modification for turbocharging.
- Diesel engines have a narrower band of engine speeds at which they operate, thus making the operating characteristics of the turbocharger over that "rev range" less of a compromise than on a gasoline-powered engine.
- Diesel engines blow nothing but air into the cylinders during cylinder charging, squirting fuel into the cylinder only after the intake valve has closed and compression is almost complete. The fuel burns at the same rate it is injected so there is no chance of detonation. Gasoline/petrol engines differ from this in that both fuel and air are introduced during the intake cycle and both are compressed during the compression cycle. The higher intake charge temperatures of forced-induction engines reduces the amount of compression that is possible with a gasoline/petrol engine, whereas diesel engines are far less sensitive to this. They are sensitive to high intake temperatures only to the extent that it will increase the exhaust temperature damaging valves and the exhaust side of the turbo.
Today, turbocharging is most commonly used on two types of engines: Gasoline engines in high-performance automobiles and diesel engines in transportation and other industrial equipment. Small cars in particular benefit from this technology, as there is often little room to fit a larger-output (and physically larger) engine. Saab is a leader in production car turbochargers, starting with the 1978 Saab 99; all current Saab models are turbocharged with the exception of the 9-7X. Saab Automobile AB, better known as Saab, is a Swedish car manufacturer and currently a wholly-owned Subsidiary of General Motors. The 99 is an Automobile produced by Saab from 1968 to 1984 Development On April 2, 1965, Gudmund's day in The Saab 9-7X is a Saab - branded Mid-size Sport utility vehicle (SUV based on General Motors' The Porsche 944 utilized a turbo unit in the 944 Turbo (Porsche internal model number 951), to great advantage, bringing its 0-100 km/h (0-60 mph) times very close to its contemporary non-turbo "big brother", the Porsche 928. The 944 is a Sports car built by Porsche from 1982 to 1991 It replaced the 924 as Porsche's entry level model although 924 production continued through Conception By the late 1960s Porsche had changed significantly as a company and executives including owner Ferdinand Porsche were playing with the idea of adding a luxury
In the 1980s, when turbocharged production cars became common, they gained a reputation for being difficult to handle. The tuned engines fitted to the cars, and the often primitive turbocharger technology meant that power delivery was unpredictable and the engine often suddenly delivered a huge boost in power at certain speeds. Some drivers said this made cars such as the BMW 2002 and the Porsche 911 exciting to drive, requiring high levels of skill. The BMW New Class (German Neue Klasse) was a line of compact sedans produced by the German automaker BMW and launched with the 1962 1500 The Porsche 911 (pronounced as Nine Eleven, Neunelfer is a Sports car made by Porsche AG of Stuttgart, Germany Others said the cars were difficult and often dangerous. As turbocharger technology improved, it became possible to produce turbocharged engines with a smoother, more predictable but just as effective power delivery.
Chrysler Corporation was an innovator of turbocharger use in the 1980s. Chrysler LLC is an American Automobile manufacturer that has been producing Automobiles since 1925 Many of their production vehicles, for example the Chrysler LeBaron, Dodge Daytona, Dodge Shadow/Plymouth Sundance twins, and the Dodge Spirit/Plymouth Acclaim twins were available with turbochargers, and they proved very popular with the public. The Chrysler LeBaron was introduced in 1977 as Chrysler 's lowest priced model and the name was used on various Chryslers until 1995 This page is about the 1980s and 1990s Daytona For information on the Charger Daytona, see this page. For 1987 Chrysler Corporation introduced two new Compact cars the Dodge Shadow and the Plymouth Sundance (which turned in similar The Plymouth Sundance is a compact car produced from 1986 (as a 1987 model to 1994 The Dodge Spirit was introduced in January 1989 as a mid-size 5/6 passenger sedan by Dodge. The Plymouth Acclaim is a Mid-size sedan produced from the 1989 to 1995 model years They are still considered competitive vehicles today, and the experience Chrysler obtained in observing turbochargers in real-world conditions has allowed them to further turbocharger technology with the PT Cruiser Turbo, the Dodge SRT-4 and the Dodge Caliber SRT-4. The Chrysler PT Cruiser is a typically American " Retro "-styled Station wagon or Hatchback built by Chrysler, launched in 2000 as an The Dodge SRT-4 is a Turbocharged variant of the Neon introduced by DaimlerChrysler 's Street and Racing Technology ( SRT) in-house The Dodge Caliber is a Compact car produced by the Dodge division of the Chrysler Group.
Aircraft
A more natural use of the turbocharger is with aircraft engines. An aircraft engine is a Propulsion system for an Aircraft. Aircraft engines are almost always a type of lightweight Internal combustion engine. As an aircraft climbs to higher altitudes the pressure of the surrounding air quickly falls off. At 5,486 m (18,000 ft) the air is at half the pressure of sea level, and the airframe only experiences half the aerodynamic drag. The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International In Fluid dynamics, the drag equation is a practical formula used to calculate the force of drag experienced by an object due to a Fluid that it is moving However, since the charge in the cylinders is being pushed in by this air pressure, it means that the engine will normally produce only half-power at full throttle at this altitude. Pilots would like to take advantage of the low drag at high altitudes in order to go faster, but a naturally aspirated engine will not produce enough power at the same altitude to do so.
Altitude effects
A turbocharger remedies this problem by compressing the air back to sea-level pressures; or even much higher; in order to produce rated power at high altitude. Since the size of the turbocharger is chosen to produce a given amount of pressure at high altitude, the turbocharger is over-sized for low altitude. The speed of the turbocharger is controlled by a wastegate. A wastegate is a Valve that diverts Exhaust gases away from the Turbine wheel in a Turbocharged engine system Early systems used a fixed wastegate, resulting in a turbocharger that functioned much like a supercharger. Later systems utilized an adjustable wastegate, controlled either manually by the pilot or by an automatic hydraulic or electric system. When the aircraft is at low altitude the wastegate is usually fully open, venting all the exhaust gasses overboard. As the aircraft climbs and the air density drops, the wastegate must continually close in small increments to maintain full power. The altitude at which the wastegate is full closed and the engine is still producing full rated power is known as the critical altitude.
The downside of turbocharging is that compressing the air increases its temperature. As with diesel engines, the most common solution to this problem is to add an aftercooler. An intercooler, or Charge air cooler, is an air-to-air or air-to-liquid heat exchange device used on turbocharged and supercharged (forced
Comparison to supercharging
A supercharger inevitably requires some energy to be bled from the engine to drive the supercharger. On the single-stage single-speed supercharged Rolls Royce Merlin engine for instance, the supercharger uses up about 150 horsepower (110 kW). WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout The watt (symbol W) is the SI derived unit of power, equal to one Joule of energy per Second. Yet the benefits outweigh the costs, for that 150 hp (110 kW), the engine is delivering 1,000 hp (750 kW) when it would otherwise deliver 750 hp (560 kW), a net gain of 250 hp. This is where the principle disadvantage of a supercharger becomes apparent: The engine has to burn extra fuel to provide power to turn the supercharger. The increased charge density increases the engine's specific power and power to weight ratio, but also increases the engine's specific fuel consumption. In Engineering, the term specific power can refer to power either per unit of Mass, Volume or Area, although power per unit of Power-to-weight ratio (specific power is a calculation commonly applied to Engines and other mobile power sources to enable the comparison of one unit or design to another Specific fuel consumption, often shortened to SFC, or TSFC is an Engineering term that is used to describe the Fuel efficiency of an Engine This increases the cost of running the aircraft and reduces its overall range.
On the other hand, a turbocharger is driven using the exhaust gases. The amount of power in the gas is proportional to the difference between the exhaust pressure and air pressure, and this difference increases with altitude, allowing a turbocharger to compensate for changing altitude without using up any extra power.
Yet the vast majority of WWII engines used superchargers, because they maintained three significant manufacturing advantages over turbochargers, which were larger, involved extra piping, and required exotic high-temperature materials in the turbine and pre-turbine section of the exhaust system. The size of the piping alone is a serious issue; consider that the Vought F4U and Republic P-47 used the same engine but the huge barrel-like fuselage of the latter was, in part, needed to hold the piping to and from the turbocharger in the rear of the plane. WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout Turbocharged piston engines are also subject to many of the same operating restrictions as gas turbine engines. Pilots must make smooth, slow throttle adjustments to avoid overshooting their target manifold pressure. Manifold vacuum, or engine Vacuum in an internal combustion engine is the difference in air pressure between the engine's intake manifold and The fuel mixture must often be adjusted far on the rich side of the peak exhaust gas temperature to avoid overheating the turbine when running at high power settings. Exhaust gas is Flue gas which occurs as a result of the Combustion of fuels such as Natural gas, Gasoline /petrol Diesel, Fuel In systems using a manually-operated wastegate, the pilot must be careful not to exceed the turbocharger's maximum RPM. Turbocharged engines require a cooldown period after landing to prevent thermal shock from cracking the turbo or exhaust system. Turbocharged engines require frequent inspections of the turbocharger and exhaust systems for damage due to the increased heat, increasing maintenance costs.
Today, most general aviation aircraft are naturally aspirated. General aviation (abbr GA) is one of two categories of Civil aviation. A naturally-aspirated engine or normally-aspirated engine (or "N/A" - Aspiration meaning breathing refers to an Internal combustion engine The small number of modern aviation piston engines designed to run at high altitudes generally use a turbocharger or turbo-normalizer system rather than a supercharger. The change in thinking is largely due to economics. Aviation gasoline was once plentiful and cheap, favoring the simple but fuel-hungry supercharger. Avgas is a high-octane Aviation fuel used for Aircraft and Racing cars Avgas is a Portmanteau for aviation gasoline As the cost of fuel has increased, the supercharger has fallen out of favor. Turbocharged aircraft often occupy a performance range in between that of normally-aspirated piston-powered aircraft and turbine-powered aircraft. The increased maintenance costs of a turbo-charged engine are considered worthwhile for this purpose, as a turbocharged piston engine is still far cheaper than any turbine engine.
Relationship to Gas Turbine Engines
Prior to World War II, Sir Frank Whittle started his experiments on early turbojet engines. Air Commodore Sir Frank Whittle, OM, KBE, FRS, Hon FRAeS (1 June 1907 &ndash 9 August 1996 was an English Royal TurboJET (噴射飛航 is the brand name for the operations of the Hong Kong -based Shun Tak-China Travel Ship Management Limited (信德中旅船務管理有限公司 Due to a lack of sufficient materials as well as funding, initial progress was slow. However, turbochargers were used extensively in military aircraft during World War II to enable them to fly very fast at very high altitudes. The demands of the war led to constant advances in turbocharger technology, particularly in the area of materials. This area of study eventually crossed over in to the development of early gas turbine engines. A gas turbine, also called a combustion turbine, is a rotary Engine that extracts energy from a flow of Combustion gas Those early turbine engines were little more than a very large turbocharger with the compressor and turbine connected by a number of combustion chambers. A combustion chamber is the part of an Engine in which Fuel is burned The cross over between the two has been shown in an episode of the TV show Scrapheap Challenge where contestants were able to build a functioning Jet Engine using an ex-automotive turbocharger as a compressor.
Consider also, for example, that General Electric manufactured turbochargers for military aircraft and held several patents on their electric turbo controls during the war, then used that expertise to very quickly carve out a dominant share of the gas turbine market which they have held ever since.
Advantages and Disadvantages
Advantages
- More specific power over naturally aspirated engine. This means a turbocharged engine can achieve more power from same engine volume.
- Better thermal efficiency over both naturally aspirated and supercharged engine when under full load (i. e. on boost). This is because the excess exhaust heat and pressure, which would normally be wasted, contributes some of the work required to compress the air.
- Weight/Packaging. Smaller and lighter than alternative forced induction systems and may be more easily fitted in an engine bay. Forced induction is a term used to describe Internal combustion engines that are not naturally aspirated.
- Fuel Economy. Although adding a turbocharger itself does not save fuel, it will allow a vehicle to use a smaller engine while achieving power levels of a much larger engine, while attaining near normal fuel economy while off boost/cruising. This is because without boost, only the normal amount of fuel and air are combusted.
Disadvantages
- Lack of responsiveness if an incorrectly sized turbocharger is used. If a turbocharger that is too large is used it reduces throttle response as it builds up boost slowly otherwise know as "lag". However, doing this may result in more peak power.
- Boost threshold. Turbocharger starts producing boost only above a certain rpm due to a lack of exhaust gas volume to overcome inertia of rest of turbo propeller. The vis insita or innate force of matter is a power of resisting by which every body as much as in it lies endeavors to preserve in its present state whether it be of rest or of moving This results in a rapid and nonlinear rise in torque, and will reduce the usable power band of the engine. The sudden surge of power could overwhelm the tires and result in loss of grip, which could lead to understeer/oversteer, depending on the drivetrain and suspension setup of the vehicle. Lag can be disadvantageous in racing. If throttle is applied in a turn, power may unexpectedly increase when the turbo winds up, which can induce wheelspin.
- Cost. Turbocharger parts are costly to add to naturally aspirated engines. Heavily modifying OEM turbocharger systems also require extensive upgrades that in most cases requires most (if not all) of the original components to be replaced.
- Complexity. Further to cost, turbochargers require numerous additional systems if they are not to damage an engine. Even an engine under only light boost requires a system for properly routing (and sometimes cooling) the lubricating oil, turbo-specific exhaust manifold, application specific downpipe, boost regulation, and proper gauges (not intrinsically necessary, but very highly recommended). In addition inter-cooled turbo engines require additional plumbing, while highly tuned turbocharged engines will require extensive upgrades to their lubrication, cooling, and breathing systems; while reinforcing internal engine and transmission parts.
See also
References
- ^ The turbocharger turns 100 years old this week
- ^ Chrysler turbocharged engines (Allpar)
- ^ a b Parkhurst, Terry. A boost gauge is a Pressure gauge that indicates manifold air pressure or Turbocharger or Supercharger boost Pressure in an Internal Twin-turbo refers to a turbocharged engine on which two turbochargers compress the intake charge Twincharger refers to a Forced induction system used on some piston-type Internal combustion engines It is a combination of an exhaust-driven Turbocharger A supercharger is an air compressor used for Forced induction of an Internal combustion engine. Turbochargers: an interview with Garrett’s Martin Verschoor. Allpar, LLC. Retrieved on 12 December 2006.
- Don Sherman (February 2006). "Happy 100th Birthday to the Turbocharger". Automobile Magazine. An automobile magazine is a Magazine with news and reports on Automobiles and the Automobile industry.
- Andrew Noakes (Friday 18th March 2005). "Audi Quattro". Pistonheads.
- Roman Angelovskij (April 2008). "BorgWarner Turbochargers Catalogue". Turbo3K.
Dictionary
turbocharger
-noun
- inlet air compressor for an internal combustion engine (either Otto or Diesel cycle), powered from the exhaust air.
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