1 Intake manifold flap servo motor
2 Intercooler bypass flap servo motor
The intake manifold flap has another function in addition to restricting the intake air for exhaust gas recirculation and closing the intake system when the engine is stopped.
During the regeneration phase the intake manifold flap closes off the airflow via the intercooler, depending on requirements. At the same time, the uncooled charge air is fed via the intercooler bypass flap.
The intake manifold flap servo motor incorporates a DC motor and a position sensor which detects the current position of the intake manifold flap.
Effects of faults
In the event of a fault, limited regeneration is still possible, depending upon how high the intake air temperature is and the operating condition of the engine.