Importance

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Abstract

A method for sorting out false indications of a knocking condition in combustion engines, and in a close loop manner influencing the control measures initiated in order to cease the knocking condition, which method includes obtaining an ionization signal characteristic of the ionization during a combustion with the aid of a gap biased by a measuring voltage and arranged in the combustion chamber. A knocking condition is detected from the determined intensity of the knock characteristic frequency content (KI) filtered out from the ionization signal. An integrated value (CQ) of the ionization signal is also used in order to influence knock control measures. Knock control measures are initiated at a first spontaneous knocking condition only if also the integrated value (CQ) from a combustion experiencing a knocking condition is increased in relation to a preceding non-knocking combustion (CQ.sub.REF.sbsb.--.sub.NORM). Further, the speed of return (KT.sub.STEP, Ign.sub.RET.sbsb.--.sub.STEP) back to ideal basic control data is accelerated, dependent on the degree of reduction of the integrated value (.DELTA.CQ.sub.REL), following a correction of basic control data initiated in order to cease the knocking condition.

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First Claim