Smoldering determination method of internal combustion engine
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United States of America Patent
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Nov 18, 2008
Grant Date -
Oct 25, 2007
app pub date -
Aug 3, 2005
filing date -
Aug 20, 2004
priority date (Note) -
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Abstract
According to the present invention, in a spark ignition-type internal combustion engine which has a spark plug and mounted in a vehicle, an ion current generated in a combustion chamber through the spark plug after ignition is detected and smoldering of the spark plug is determined on the basis of the detected ion current. An operation state of the internal combustion engine is detected and smoldering of the spark plug is determined based on that the detected ion current satisfies a predetermined condition when the detected operation state falls within an operation determination range set corresponding to an operation range in which an intake port pressure close to an atmospheric pressure is achieved using predetermined engine speed as an upper limit and a predetermined intake port pressure as a lower limit.
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