Cylinder judgment apparatus and cylinder judgment method of engine
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United States of America Patent
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Oct 19, 2004
Grant Date -
Dec 26, 2002
app pub date -
Jun 18, 2002
filing date -
Jun 20, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Cylinder judgment signals are output from cam sensors at every uneven crank angle interval. The number of cylinder judgment signals output per cam sensor during a time period between a previous output and a present output of cylinder judgment signals from the other cam sensor, is counted up, to judge a specific cylinder based on the number of outputs. As a result, cylinders other than the specific cylinder are judged based on the judgment result and the cylinder judgment signals. Simultaneously, a time period from the previous cylinder judgment to the present cylinder judgment is calculated, to judge erroneous detection of cylinder judgment signal due to noise based on a ratio between a previous calculation value and a present calculation value of the time period. When the erroneous detection is judged, the cylinder judgment result based on the cylinder judgment signals is canceled.
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