Patent ID: 6655191
Filing Date: 2003-12-02
Classification: F02P,G01L

Abstract:
Method for detecting knocking combustion during operation of an internal combustion engine, in which a raw ionic current signal (IS(t)) is measured by an ionic current probe during a combustion stroke in combustion chambers of the internal combustion engine, from which a value of a knocking intensity (KI) is evaluated, wherein fluctuations in an intensity of the raw ionic current signal (IS(t)) are compensated for by performing a normalization of the raw ionic current signal (IS(t)) or the value of the knocking intensity (KI), wherein the chronological form of the raw ionic current signal (IS(t)) is composed first of ignition faults, then of a first maximum of the combustion, and then of a second maximum of the raw ionic current signal, and wherein an ionic current amplitude value (IM), that is the maximum value of the second maximum of the raw ionic current signal (IS(t)), or an ionic current integral value (II), that is the value of an integration of the raw ionic current signal (IS(t)), is currently determined for performing the normalization after each combustion stroke.