Self-diagnosing apparatus and method for determining occurence of failure in inner cylinder pressure responsive sensor applicable to engine combustion detecting/controlling system
US5469735A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1994 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Dec 9, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.