Steering Angle Sensor: Description and Operation

4560 Steering Angle Sensor

For parts standardization the steering angle sensor previously mounted on the steering system of the 911 Carrera (996) has been replaced by the one used on the Cayenne.







NOTE: The steering angle sensor of the 911 Carrera/S must be initialized or calibrated after the work described below has been carried out.

Initializing - following each interruption of the Terminal 30 power supply

Calibrating - following any work on the vehicle (e.g. suspension alignment, change of parts)

The steering angle sensor (arrow) consists of an optical segment sender and a code disk, which are integrated in the steering column switch. The light emitted by the segment sender is interrupted by the inner ring in a specific sequence resulting in 5 segments with 72° per revolution. The outer ring is set up to cause interruptions of varying length from which the system can calculate the exact steering angle. The data measured in the integrated micro processor is sent to the PSM control module via the CAN bus.

The PSM control module thus receives the information on the lock angle of the front wheels (driver intention with regard to direction of travel).
This signal is used inside the PSM control device to determine the optimum vehicle behavior with regard to its longitudinal dynamics through offsetting the speed of travel.