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

1993-12-14

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

052692825

ABSTRACT:
In a misfire detector for use in an internal combustion engine having an ignition coil, an electrical interrupter circuit interrupts a primary current flowing through a primary circuit of the ignition coil by which a spark plug is energized. A voltage divider circuit detects a divided voltage of a spark plug voltage applied across the spark plug. A spark plug voltage detector circuit is provided to detect an attenuation characteristic of a spark plug voltage waveform presented subsequent to a time period predetermined either during a spark action of the spark plug or after an end of the spark action of the spark plug. A peak hold circuit is provided to hold a peak voltage of the spark plug voltage waveform presented after the end of the spark action of the spark plug, so that a distinction circuit determines a misfire on the basis of a peak voltage level or the attenuation characteristics of the spark plug voltage waveform.

REFERENCES:
patent: 3942102 (1976-03-01), Kuhn et al.
patent: 4117807 (1978-10-01), Barnard
patent: 4138710 (1979-02-01), Tsukuru
patent: 4547734 (1985-10-01), Spaude
patent: 4987771 (1991-01-01), Iwata
patent: 5046470 (1991-09-01), Entenmann et al.

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