Misfire detecting device

Details Misfire detecting device Misfire detecting device

1996-11-22

1998-05-19

Regan, Maura K.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324399, 324388, F02P 1700

Patent

active

057540519

ABSTRACT:
A misfire detecting device for an ignition system, comprises high voltage applying means for applying a pulsed high voltage to each spark plug of an engine after completion of firing of the spark plug, voltage restricting means for restricting a peak of the pulsed high voltage to a highest possible value that does not cause firing of the spark plug, voltage detecting means for detecting a plug voltage across a center electrode-to-outer electrode of the spark plug after reducing the same, and misfire detecting means for detecting a misfire at each cylinder on the basis of a decay characteristic of a detection voltage which is caused by application of the pulsed high voltage. In another embodiment, the misfire detecting device comprises high voltage applying means which monitors a detection voltage which is caused by application of the pulsed high voltage to each spark plug and controls the pulsed high voltage so that the detection voltage is maintained at a highest possible value that does not cause firing of the spark plug due to application of the pulsed high voltage to the spark plug.

REFERENCES:
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Patent Abstracts of Japan, vol. 017, No. 447, 17 Aug. 1993.
Patent Abstracts of Japan, vol. 018, No. 123, 28 Feb. 1994.

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