Supercharger boost pressure control function - GF09.50-P-3002KE

ENGINE 271.921 in MODEL 203

ENGINE 271.940 in MODEL 203, 209

ENGINE 271.941 in MODEL 211

ENGINE 271.944 in MODEL 171

ENGINE 271.946 in MODEL 203

ENGINE 271.948 in MODEL 203

ENGINE 271.955 in MODEL 209

ENGINE 271.956 in MODEL 211

Fig 1: Identifying Supercharger Boost Pressure Control Function - Engine 271.948

The supercharger makes it possible to achieve an increase in engine torque (engine power output) particularly in the lower engine speed range.

The inducted air is compressed in the supercharger and cooled down in the charge air cooler. The cylinder charge level is increased by the compressed intake air (charge air). The corresponding fuel quantity for the increased air mass is measured by the ME control unit.

The intake/boost pressure is detected by the pressure sensor (intake manifold) and a matching voltage signal is relayed to the ME control unit.

The boost pressure is controlled on the basis of the map and load by the ME control unit by means of the recirculated air flap actuator. In the full load range, a maximum boost pressure is built up (air recirculation flap closed).

Boost pressure control is dependent on:

Engine speed
Load requirement (driver)
The safety functions of engine control, such as anti-knock control, transmission overload protection and catalytic convertor overheating protection

Crankshaft position sensor, component description	L5	GF07.04-P-6010KE
Pressure sensor component description	B28	GF07.04-P-6060KE
Component description of hot film MAF sensor	B2/5	GF07.07-P-6000KE
ME-SFI [ME] control unit, component description	N3/10	GF07.61-P-6000KE
Component description of air recirculation flap actuator	M16/7	GF09.50-P-2100KE
Accelerator pedal sensor component description	B37	GF30.20-P-2010KE
Component description of throttle valve actuator	M16/6	GF30.20-P-2020KE