ME power steering pump pressure regulator valve actuation function - GF07.61-P-4018V

ENGINE 272.942 /963 in MODEL 171

ENGINE 272.922 /943 /944 /964 /972, 273.960 /962 in MODEL 211

ENGINE 272.964, 273.960 in MODEL 219

Shown on Engine 272.963 in Model 171

Fig 1: ME Power Steering Pump Pressure Regulator Valve Actuation Function Chart - Shown On Engine 272.963 In Model 171

Courtesy of MERCEDES-BENZ USA

Via the map-dependent actuation of the quantity control valve at the power steering pump, engine load is reduced to optimize fuel consumption.

The quantity control valve is located in a bypass to the working chamber of the power steering pump.

Actuation takes place via a PWM signal (duty cycle from 10 to 90 %). Current consumption is from 0 to 900 mA.

Via the valve opening, the volume flow to the power steering pump is matched to the requirement. It is dependent on the following input signals:

Engine speed
Vehicle speed (via CAN)
Steering angle (via CAN)
Steering angle speed (via CAN).

The quantity control valve is connected fast to the power steering pump. The coil resistance at room temperature is around 5.5 t and the max. current uptake around 0.9 A.

With ignition ON, during engine start and in the event of a fault, the pressure control valve is fully opened (actuation interrupted). Maximum support via the power steering pump is thus available.

ME-SFI [ME] control unit component description	GF07.61-P-6000V
Crankshaft Hall sensor component description	GF07.04-P-6220V