S 65 AMG (221.179) V12-6.0L Turbo (275.982) (2008)
Power Steering Pump: Description and Operation
GF46.50-P-2400SX SPS Electrically Controlled Centering, Function
GF46.50-P-2400SX SPS electrically controlled centering, function
The electronic control of the speed-sensitive power steering is integrated in the ESP control unit (N47-5). A certain manual force is set at the steering
wheel according to the speed of the vehicle. As the speed of the vehicle increases, the manual effort required to turn the steering increases at the
steering wheel (up to 100 km/h).
The driving speed determined by the ESP control unit is assigned a specified current in a performance map. This current is then set in the SPS
solenoid valve (Y10) and influences the oil flow (hydraulic reaction) within the rack-and-pinion steering, and thus the manual force required on the
steering wheel. The actuation of the SPS [PML] solenoid valve is pulsed. The current is regulated by pulse width modulation of these pulses.