Patent ID: 7458249
Filing Date: 2008-12-02
Classification: F02B,F02D,F02P,Y02T

Abstract:
1. A method for operating an internal combustion engine, comprising: providing a final controlling element in an exhaust system of the internal combustion engine; producing a signal using a signal production unit, as a function of a setting of the final controlling element; comparing a value for a characteristic property of the signal to a predefined reference value; and ascertaining an error as a function of a deviation of the value for the characteristic property of the signal from the predefined reference value in a fired operation of the internal combustion engine; wherein the signal is analyzed for signal fluctuations as the characteristic property of the signal, and wherein an error is ascertained if an amplitude of the signal fluctuations of the signal falls below a predefined threshold value during a fired operation of the internal combustion engine.