Power Steering Pump: Description and Operation

Steering On Cayenne S Hybrid

Hydraulic pump







The hydraulic pressure is delivered by an electrically driven gear pump integrated in the front left wheel housing. The demand-controlled pump only generates the energy required for power assistance in response to a steering command from the driver and otherwise remains in standby mode, e.g. when driving straight ahead. This contributes to a reduction in fuel consumption of more than 80% compared with purely hydraulic systems. The electrification of the unit means that the function is guaranteed even in driving modes with the combustion engine switched off. The Servotronic thus also functions when maneuvering in purely electric mode.

The pump drive power is controlled for optimum fuel consumption according to the vehicle speed, steering angle and, most importantly, the steering angle dynamics. Efficient control means that cooling of the power-steering fluid is not required.