Misfire detector for use in internal combustion engine

Details Misfire detector for use in internal combustion engine Misfire detector for use in internal combustion engine

1992-04-09

1994-11-22

Dolinar, Andrew M.

Internal-combustion engines

High tension ignition system

Having auxiliary spark gap in series or parallel with the coil

123655, 73116, 324399, F02P 1700

Patent

active

053659104

ABSTRACT:
A misfire detector for use in an internal combustion engine has an ignition coil including a primary coil and a secondary coil. An interrupter circuit is provided for on-off actuation of primary current flowing through a primary circuit of the ignition coil. A distributor has a series gap provided in a secondary circuit of the ignition coil, and a spark plug is adapted to be energized from the ignition coil through the series gap of the distributor. A voltage charging circuit works to electrically charge a stray capacity inherent in the spark plug immediately after an end of a spark action of the spark plug. A spark plug voltage detector circuit distinguishes the voltage waveform of more than a predetermined reference voltage level so as to deform the voltage waveform into output signals. On the basis of the width of the output signals, a distinction circuit determines whether or not the spark action ignites an air-fuel mixture in a cylinder of the internal combustion engine.

REFERENCES:
patent: 3942102 (1976-03-01), Kuhn et al.
patent: 4117807 (1978-10-01), Barnard
patent: 4138710 (1979-02-01), Tsukuru
patent: 4987771 (1991-01-01), Iwata
patent: 5046470 (1991-09-01), Entenmann et al.

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