GF46.50-P-2400RT SPS Electrically Controlled Centering, Function

GF46.50-P-2400RT SPS electrically controlled centering, function
- up to model year 08

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).

A specified current in a performance map is assigned to the vehicle speed determined by the ESP control unit. 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.