01-10-10 Intake/Exhaust System Description
General:
For operation the engine has to be supplied by the intake system with compressed air at manifold
pressures up to 2660 mbar (38,57 psi), which varies with altitude and power setting. The increased
manifold pressure is accomplished with an exhaust driven turbo charger. After the turbocharger, the
air passes through the intercooler, through the engine to the turbine side of the turbocharger before
exhausting to the atmosphere.
The intake air is cleaned by an air filter and then compressed by the turbo charger. During
compression the intake air gets hot. An intercooler between turbo charger and engine is provided to
cool the intake air down thus the desired engine performance can be obtained.
At the intake manifold the intake air temperature and intake air pressure are measured. For the
temperature and pressure readings there are two sensors for each value installed. To provide the
intake air pressure corresponding to the desired engine power and ambient EECU pressure a waste
gate valve is directly mounted at the turbo charger.
Turbo Charger
The EECU controls the turbocharger by using RPM, measured manifold pressure and barometric
pressure to determine a target value for manifold pressure. The EECU then sends an output signal
corresponding to this target value to a boost pressure actuator, which actuates the waste gate.
The boost pressure actuator uses air pressure from the compressor side of the turbocharger to control
a diaphragm box. This diaphragm box is mechanically linked to the turbo charger waste gate and
regulates the amount of exhaust gas that bypasses the turbocharger turbine and therefore manifold
pressure.
The figure shows the turbocharger with the boost pressure actuator, air filter for the boost pressure
actuator and the waste gate controller which is attached to the turbo charger.
Fig. 01 - 8 Turbo Charger Operation
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