Description And Operation
The accelerator pedal sensor (2) consists of two potentiometers - main and secondary for safety - integrated in a single casing. It is used by the Engine Management Node to recognise the position of the accelerator pedal (1) in order to manage the torque requested by the driver. The sensor is located on the accelerator pedal and consists of a casing secured to the accelerator pedal mounting; the casing contains an axially-located shaft connected to two integrated potentiometers.
A spring on the shaft ensures the correct amount of resistance to pressure while a second spring ensures return following release.
The injection control unit implements the following recovery strategies under the following conditions:
- if one of the two potentiometers fails, the control unit uses the remaining track without restricting the torque and checks the plausibility with the brake switch.
- if both potentiometers fail completely, throttle opening is prevented.