Monitoring Function: Rationality check of ambient pressure sensor

Since the maximum rational pressure drop/rise is limited by the utmost decline/pitch at maximum vehicle speed or abruptly changing meteorological conditions, every gradient beyond this plausible threshold is detected as fault and the rationality check is stopped for this driving cycle.

(In case the sensor drift exceeds the electrical thresholds furthermore, an additional electrical error is detected.)

Since the sensor can be stuck at a wrong value (inside the electrical frame) after an implausible drift and an additional, repeated drift is not very likely, the fault path is not cleared before an additional model has proven the accuracy of the signal in one of the proximate DCs.

An incorrect comparison of the ambient pressure model in the subsequent driving cycle confirms the preceding error as well as a repeated but unlike excessive gradient does again.

If the sensor operates on an incorrect level without having had an excessive gradient before, this is also detected by a comparison with the aforementioned ambient pressure model.

An unobjectionable operating sensor is also detected by the ambient pressure model, which leads to the clearance of the fault path.