Purge control valve actuation, function - GF07.61-P-3013M

ENGINE 275.950 in MODEL 215, 220

ENGINE 275.951 in MODEL 230 up to Model Year 8

ENGINE 275.953 in MODEL 216, 221 up to Model Year 8

ENGINE 275.954 in MODEL 230 up to Model Year 8

ENGINE 275.980 in MODEL 215, 220

ENGINE 275.981 in MODEL 230 up to Model Year 8

ENGINE 275.982 in MODEL 216, 221 up to Model Year 8

ENGINE 285.950 in MODEL 240

ENGINE 285.980 in MODEL 240

Fig 1: Purge Control Valve Actuation Function Diagram

Courtesy of MERCEDES-BENZ USA

For controlling the purge quantity, the purge control valve is actuated at the ground side by the ME control unit by means of a pulse width modulated signal. The purge quantity is determined by constantly opening and closing the purge control valve for on and off periods of various lengths.

The frequency of the PWM signal is selected from a speed-dependent characteristic in such a way, that all cylinders are uniformly supplied with fuel vapors.

The actuation is performed in the suction mode when engine is at operating temperature, however not in the deceleration fuel shutoff mode.

The following information is processed in the ME-SFI control unit:

Engine speed
Boost pressure
Coolant temperature
Boost air temperature
Lambda signal.

	ME-SFI control unit, location/task/design/function		GF07.61-P-5000M
	Coolant temperature sensor, location/task/design/function		GF07.04-P-5026M
	Crankshaft position sensor, location/task/design/function		GF07.04-P-4116M
	Purge control valve, location/task/design/function		GF47.30-P-4030M
	Pressure sensor downstream of throttle valve actuator location/task/function		GF07.04-P-5049M
	Charge air temperature sensor, location/task/function		GF07.04-P-5038M