5.1.2. An action principle – EPS

The EPS control unit operates system according to the card depending on angular speed of rotation of the pump of hydrosystem. Speed of the car is transferred to the EPS control unit via the tire CAN.

EPS of production TRW which is not connected with the tire CAN, has no sensor of an angle of rotation. Instead information on pressure increase in the steering mechanism which occurs at turn of a steering wheel is used.

To cars with anti-blocking system of brakes of ESP MK60 have the sensor of an angle of rotation in CIM. On cars with EPS ZF, information from the sensor of an angle of rotation of CIM is transferred via the tire HS CAN to the EPS control unit. Because of big power consumption the hydraulic pump is not put in action while the engine does not work. If during a trip there is a failure of the generator of an alternating current, the hydraulic pump is switched off, that protect the storage battery from the category.