Self-diagnosing apparatus and method for determining occurence o

Measuring and testing – Simulating operating condition – Marine

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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.

REFERENCES:
patent: 4531399 (1985-07-01), Aono
patent: 4537065 (1985-08-01), Ootsuka et al.
patent: 4660535 (1987-04-01), Asano
patent: 4744244 (1988-05-01), Tanaka
patent: 4781059 (1988-11-01), Suzuki et al.
patent: 5386723 (1995-02-01), Wier

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