Measuring and testing – Simulating operating condition – Marine
Patent
1994-12-09
1995-11-28
Chilcot, Richard
Measuring and testing
Simulating operating condition
Marine
73 4R, 731173, G01M 1900
Patent
active
054697352
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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Chilcot Richard
McCall Eric S.
Unisia Jecs Corporation
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