Purge control valve actuation - function - GF07.61-P-3013BK

ENGINE 113.967 in MODEL 219 

ENGINE 113.964 in MODEL 164.1 

ENGINE 113.971 in MODEL 251 

Shows model 219 

Fig 1: Purge Control Valve Actuation Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

When 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
• Air mass
• Coolant temperature
• Intake air temperature
• Lambda signal.

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