Misfire detecting device for internal combustion engine

Details Misfire detecting device for internal combustion engine Misfire detecting device for internal combustion engine

1996-01-17

1997-04-01

Wieder, Kenneth A.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324388, 123630, 123656, F02P 1700

Patent

active

056170327

ABSTRACT:
A misfire detecting device for an internal combustion engine is provided. The misfire detecting device includes high voltage pulse producing means for producing, after spark discharge of a spark plug, a high voltage pulse which is not so high as to cause the spark plug to discharge, voltage applying means for applying the high voltage pulse to a conductive path connecting between a secondary winding of an ignition coil to the spark plug, by way of a reverse current preventing diode and a leakage preventing diode connected to the conductive path or by way of a reverse current preventing diode and the secondary winding of the ignition coil, voltage dividing means for dividing a voltage at a side of the reverse current preventing diode nearer to the conductive line to obtain a divided voltage, misfire detecting means for detecting a misfire on the basis of a decay characteristic of the divided voltage obtained after application of the high voltage pulse, wherein the reverse current preventing diode and the leakage preventing diode or the secondary winding of the ignition coil are connected by means of a shielding wire having an outer conductor for shielding.

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patent: 5561239 (1996-10-01), Yasuda

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