EDR Throttle Position Feedback Signals

EDR THROTTLE POSITION FEEDBACK SIGNALS

The throttle valve positions are monitored by two feedback potentiometers mounted on the ends of the throttle valve shafts. Each potentiometer has its own power (5 volt) and ground supply for safety reasons. The two signals are used for redundant monitoring of the throttle valve positions.

Due to their positioning on the engine, the signals from the potentiometers are inverse, however the MS S52 is monitoring the linear characteristics of the signal for determining throttle valve position.

Checking of the potentiometer signals is split into checking each signal individually and comparing the two signal values.

Different emergency operating programs are activated depending on what fault might occur with the feedback signal circuits as follows:
- Emergency program #1. - Error while checking signal comparison.
- Emergency program #1. - Fault with one potentiometer signal or sensor.
- Emergency program #2. - Fault with both potentiometer signals or sensors.