Patent ID: 7810386
Filing Date: 2010-10-12
Classification: F02D

Abstract:
1. A method for a plausibility check of an output signal of a rail pressure sensor of a direct-injecting internal combustion engine having a common rail system, comprising: detecting the output signal of the rail pressure sensor over a predefinable period of time; recording the output signal; transforming the output signal into the frequency space; extracting characteristic features from the transformed signal; calculating a rail pressure value on the basis of the features and additional, predefined influencing variables; simultaneously ascertaining an average rail pressure value from the output signal of the rail pressure sensor; comparing the average rail pressure value with the calculated rail pressure value; and in the event that the calculated rail pressure value deviates from the average rail pressure value by a predefined limiting value, at least one of (a) outputting an error signal and (b) storing an error signal in an error memory.