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TDI Engines.

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TDI Engines  |  How it works  |  Turbocharger  |  Diesel particulate filter  |  Injection systems  |  Common rail  |  Piezo injectors
Turbocharger.

Turbocharger.

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To further increase power output and torque, Volkswagen equips its TDI engines with exhaust turbochargers featuring variable turbine geometry. They compress the air required for combustion, thus enabling the engine to draw in a greater quantity of air while its displacement and revs remain the same. The engine power output is consequently higher.
To further increase power output and torque, Volkswagen equips its TDI engines with exhaust turbochargers featuring variable turbine geometry.
They compress the air required for combustion, thus enabling the engine to draw in a greater quantity of air while its displacement and revs remain the same. The engine power output is consequently higher.
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A turbocharger is powered by the energy contained in the exhaust gas. It consists of two turbines. The turbine wheel is located in the exhaust stream and drives a compressor wheel connected by a shaft. This is where the air is compressed. The air heated by the compression process is usually cooled by means of a charge air cooler, and then fed to the combustion chamber. Cool air takes up less space than hot air. Charge air cooling thus allows more oxygen for combustion to enter the combustion chamber.
A turbocharger is powered by the energy contained in the exhaust gas. It consists of two turbines. The turbine wheel is located in the exhaust stream and drives a compressor wheel connected by a shaft. This is where the air is compressed. The air heated by the compression process is usually cooled by means of a charge air cooler, and then fed to the combustion chamber. Cool air takes up less space than hot air. Charge air cooling thus allows more oxygen for combustion to enter the combustion chamber.
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The main disadvantage of a turbocharger is that it needs a certain gas pressure in order to work, but this pressure is only available when the engine revs are sufficiently high. This is the origin of the expression “turbo lag”. To achieve optimum efficiency at lower engine revs, too, the turbocharger needs a means of controlling the exhaust pressure.
The main disadvantage of a turbocharger is that it needs a certain gas pressure in order to work, but this pressure is only available when the engine revs are sufficiently high. This is the origin of the expression “turbo lag”. To achieve optimum efficiency at lower engine revs, too, the turbocharger needs a means of controlling the exhaust pressure.
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In a VTG turbocharger (VTG = variable turbine geometry), a system of mechanical guide vanes alters the cross-section of the exhaust flow inlet on the drive side. If the gas pressure declines at slower engine revs, the control system adjusts the guide vanes to a position that narrows the cross-section, thus accelerating the exhaust flow and increasing the pressure.As the exhaust gas pressure rises with increasing engine revs, the control system makes the inlet cross-section larger by altering the position of the guide vanes.
In a VTG turbocharger (VTG = variable turbine geometry), a system of mechanical guide vanes alters the cross-section of the exhaust flow inlet on the drive side. If the gas pressure declines at slower engine revs, the control system adjusts the guide vanes to a position that narrows the cross-section, thus accelerating the exhaust flow and increasing the pressure.
As the exhaust gas pressure rises with increasing engine revs, the control system makes the inlet cross-section larger by altering the position of the guide vanes.
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Turbochargers with variable turbine geometry are especially effective at increasing power in the part-load range – “turbo lag” is no longer a problem. They result in an engine with a higher power output and improved responsiveness. Moreover, they can have a positive impact on emissions.
Turbochargers with variable turbine geometry are especially effective at increasing power in the part-load range – “turbo lag” is no longer a problem. They result in an engine with a higher power output and improved responsiveness. Moreover, they can have a positive impact on emissions.
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