Self-diagnosing apparatus and method for determining occurence of failure in inner cylinder pressure responsive sensor applicable to engine combustion detecting/controlling system
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United States of America Patent
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-
Nov 28, 1995
Grant Date -
N/A
app pub date -
Dec 9, 1994
filing date -
Dec 9, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a self-diagnose apparatus and method for detecting an occurrence of failure in any one of a plurality of inner pressure responsive sensors due to a variety mode of failures, an integral value IMEP.sub.i within a predetermined integral interval of an inner cylinder pressure P for each engine cylinder is calculated, under an engine steady-state driving condition, a weight mean value BGIMEP.sub.i for each engine cylinder of the integral value IMEP.sub.i and a weight mean value TBGIMP for all cylinders are calculated, respectively, and a deviation JGIMEP between BGIMEP.sub.i and TBGIMP is calculated. If JGIMEP.gtoreq.SLSNS (threshold value), the self-diagnose apparatus and method determine that any one of the inner cylinder pressure responsive sensors which corresponds to one of the cylinders which indicates the result of JGIMEP.gtoreq.SLSNS has failed.
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