Method and arrangement for detecting combustion misfires of a in

Electricity: measuring and testing – Internal-combustion engine ignition system or device

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324380, 324391, 324393, 324399, 324459, 73 3504, 73 3506, 73 3508, 731172, 731173, 12340627, 12340635, 123436, F02P 1700

Patent

active

060912448

ABSTRACT:
The invention is directed to a method of detecting combustion misfires of an internal combustion engine wherein an ion current is generated during the operation of the engine. The ion current signal is detected over a pregiven time interval starting with the discharge of a spark plug. The ion current signal is integrated over time with a weighting function to obtain a weighted integrated signal and the weighting function is adapted to previously detected ion current signals. The maximum of the weighted integrated signal is compared to a threshold value (s.sub.-- io) dependent upon engine rpm (nmot) and load (rl). A fault signal is outputted when the threshold value (s.sub.-- io) is not exceeded. The invention is also directed to an arrangement for detecting the combustion misfires.

REFERENCES:
patent: 5180984 (1993-01-01), Murata et al.
patent: 5343844 (1994-09-01), Fukui et al.
patent: 5561239 (1996-10-01), Yasuda
patent: 5563332 (1996-10-01), Yasuda
patent: 5675072 (1997-10-01), Yasuda et al.

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