Engine combustion condition detecting apparatus equipped with ma

Details Engine combustion condition detecting apparatus equipped with ma Engine combustion condition detecting apparatus equipped with ma

1998-03-17

1999-08-31

Do, Diep

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324388, 731173, 12340627, F02P 1700, G01M 1500

Patent

active

059458283

ABSTRACT:
A failure of a detecting circuit such as an ion current detecting circuit for detecting a combustion condition of an engine can be diagnosed at a stage for detecting a combustion condition by a combustion condition detecting apparatus equipped with a malfunction diagnosing apparatus. The engine combustion condition detecting apparatus equipped with the malfunction diagnosing apparatus is arranged by a sensing circuit for sensing an ion current flowing through a combustion chamber, a misfire judging means for judging misfire occurred in the engine in response to the detection signal derived from the sensing circuit, and a malfunction judging means for judging malfunction of the sensing circuit.

REFERENCES:
patent: 5309884 (1994-05-01), Fukui et al.
patent: 5392641 (1995-02-01), McCombie
patent: 5425339 (1995-06-01), Fukui
patent: 5606120 (1997-02-01), Daicho et al.
patent: 5755206 (1998-05-01), Takahashi et al.
patent: 5775298 (1998-07-01), Haller

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