Importance

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Abstract

An apparatus for combustion condition diagnosis has an ionic current detecting circuit for measuring a voltage at the secondary side of the ignition coil of an engine during a plurality of time periods during one operation cycle including a period in which an internal pressure of a cylinder of the engine becomes maximum, under a normal combustion condition. A window generation circuit is provided for establishing the time periods, an integration circuit is provided for integration processing of the measured voltage during each time period, a ROM stores a list indicating combustion condition corresponding to the integrated value for the each time period, and a CPU diagnoses the combustion condition based on the integrated value for the each time period and the list of combustion conditions, in order to decrease erroneous judgement and perform more adequate combustion condition diagnosis.

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First Claim