SPS [PML] solenoid valve, component description - GF46.50-P-5140GZ

MODEL 164

Shown on model designation 164.1

Fig 1: Identifying Rotary Valve And Control Bush, Rack-And Pinion Steering With SPS Solenoid Valve

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The SPS [PML] solenoid valve serves the control of the steering wheel torque in the vehicle speed range of v = 0 km/h to v = 100 km/h.

The SPS [PML] solenoid valve is a flow controlled proportioning valve.

SPS [PML] solenoid valve open

Fig 2: Identifying SPS [PML] Solenoid Valve Open Position

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

SPS [PML] solenoid valve closed

Fig 3: Identifying SPS [PML] Solenoid Valve Closed Position

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

The electronics for the actuation of the SPS [PML] solenoid valve are integrated in the ESP control unit (N47-5). The SPS [PML] solenoid valve is actuated in a pulsed manner. As the vehicle speed increases, the current flow reduces and the SPS [PML] solenoid valve continuously opens the control valve as per a characteristic defined in the ESP control unit.

This regulates the oil flow and thus the torque to be applied to the steering wheel. If the SPS [PML] solenoid valve is actuated with the maximum current (v = 0 km/h), the control valve is closed. As a result there is no oil flow and the smallest steering wheel torque to be used is adjusted (parking situation).