Misfire detecting device for gasoline internal combustion engine

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

1995-11-09

1997-12-23

Karlsen, Ernest F.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324388, 123630, 123656, F02P 1700

Patent

active

057010773

ABSTRACT:
A method of detecting a misfire of a gasoline internal combustion engine is provided. By this method, a high voltage pulse which is not so high as to cause spark discharge, is applied to a secondary winding side of an ignition coil by way of a diode during the time after completion of spark discharge and before generation of a high voltage for next ignition, a misfire at each cylinder is detected on the basis of a decay characteristic of a voltage at a cathode side of the diode, and a charge accumulated at the secondary winding side of the ignition coil is forcedly discharged before a next high voltage pulse is supplied to the secondary winding side. A device for carrying out the above method is also provided.

REFERENCES:
patent: 4004561 (1977-01-01), Thieme
patent: 5503132 (1996-04-01), Miyata et al.
patent: 5581188 (1996-12-01), Miyata et al.
patent: 5592926 (1997-01-01), Miyata et al.
patent: 5617032 (1997-04-01), Inagaki

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