Title:
MISFIRE DETECTOR FOR INTERNAL COMBUSTION ENGINES
Document Type and Number:
WIPO Patent Application WO/1995/016856
Kind Code:
A1
Abstract:
The present invention aims at improving a misfire detecting accuracy by making a detector learn a misfire level constituting a misfire judgement standard. An indicated mean effective pressure is calculated by integrating an inner pressure of a cylinder. A judgement is made as to whether a fuel has been cut or not. When a fuel has not been cut, a misfire level is retrieved from a misfire level map drawn by the rotational speeds of an engine, and the indicated mean effective pressure and misfire level are compared with each other to make a judgement concerning the occurrence of misfire. When a fuel supply has been stopped the data in the misfire level map are rewritten with the indicated mean effective pressure during the fuel-stop period used as a misfire level corresponding to an actual rotational speed of the engine.
Inventors:
HOSHINA ATSUMI (JP)
WATANABE SATORU (JP)
WATANABE SATORU (JP)
Application Number:
PCT/JP1994/002087
Publication Date:
June 22, 1995
Filing Date:
December 13, 1994
Export Citation:
Assignee:
UNISIA JECS CORP (JP)
HOSHINA ATSUMI (JP)
WATANABE SATORU (JP)
HOSHINA ATSUMI (JP)
WATANABE SATORU (JP)
International Classes:
F02B77/08; F02D45/00; G01M15/04; G01M15/11; (IPC1-7): F02D45/00; F02P17/00
Foreign References:
| JPH03206337A | 1991-09-09 | |||
| JPH03138433A | 1991-06-12 | |||
| JPH03164554A | 1991-07-16 | |||
| JPH04265475A | 1992-09-21 |
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