Pedal Position Sensor (PWG)

Pedal position sensor (PWG)
The pedal position sensor in the EMLIIIS system is used to record the driver's requirements. For this purpose, a measured signal (signal name PWGx-SIG; x = 1, 2 or 3) proportional to the accelerator pedal angle is generated in a pair of coils in the pedal position sensor (PWG).

3 pedal position sensors are installed in order to ensure in the event of a sensor failing that the driver's requirements are recorded without losses in safety.

The 3 measured signals are transferred via 3 shielded supply lines to the EMLIIIS control unit where they are processed in 3 evaluation circuits (so-called angle pulse generator ICs, WIG-ICs).

The valid value range of the accelerator pedal angle is between 0 and 99.6 %. The WIG-ICs also feature

- a calibration function to adjust tolerances
- and an oscillator to generate the input signal (signal name PWGx-OSZ, x = 1, 2 or 3) for the PWG sensor.

By way of the self-diagnosis function of the EMLIIIS control unit, every step from acquisition up to evaluation of the driver's requests, including the calibration function and PWG basic adaptation is monitored and in the event of a malfunction, the cause is indicated and described.