Misfire detecting device

Details Misfire detecting device Misfire detecting device

1995-01-26

1996-12-03

Regan, Maura K.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Coil

324393, 324399, F02P 1700

Patent

active

055811884

ABSTRACT:
A misfire detecting device for an ignition system, comprises high voltage applying device for applying a pulsed high voltage to each spark plug of an engine after completion of firing of the spark plug, voltage restricting device 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 component for detecting a plug voltage across a center electrode-to-outer electrode of the spark plug after reducing the same, and misfire detecting device 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 has a high voltage device 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:
patent: 4918389 (1990-04-01), Schleupen et al.
patent: 5027073 (1991-06-01), Kaller
patent: 5046470 (1991-09-01), Entenmann et al.
patent: 5293129 (1994-03-01), Ikeuchi et al.
patent: 5294888 (1994-03-01), Miyata et al.
patent: 5418461 (1995-05-01), Maeda et al.

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