Misfire-detecting system for internal combustion engines
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United States of America Patent
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-
Jun 21, 1994
Grant Date -
N/A
app pub date -
Dec 22, 1992
filing date -
Dec 25, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A misfire-detecting system for an internal combustion engine detects values of operating parameters of the engine, determines ignition timing of the engine, based upon detected values of operating parameters of the engine to generate an ignition command signal indicative of the determined ignition timing, generates high voltage for causing generation of sparking voltage across a spark plug for discharging the spark plug, according to the ignition command signal, detects a value of the sparking voltage generated across the spark plug when the high voltage is generated, compares the detected value of the sparking voltage with a predetermined reference value, and determines whether or not a misfire has occurred in the engine, based upon results of the comparison. It is determined that the system is abnormal, when it is determined that no misfire has occurred while fuel supply to the engine is being interrupted.
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