Equipment for recognizing misfiring

Details Equipment for recognizing misfiring Equipment for recognizing misfiring

1983-03-09

1985-10-15

Moore, David K.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324399, 324378, 315209T, 315209M, F02P 1700

Patent

active

045477345

ABSTRACT:
An equipment for recognizing misfiring, which is particularly suitable for permanent installation in a motor vehicle. By means of high-pass filters coupled to the plug leads between the spark distributor and the spark plugs, the change to the voltage at the spark plugs associated with the initiation of the ignition spark is sensed. The high-pass filters are so arranged that they only send on a needle-shaped output pulse signal to an analysis circuit if it appears with the change in voltage associated with the spark front. The analysis circuit generates appropriate output signals with reference pulses generated in time with the ignition pulses. The high-pass filters are preferably arranged as simple RC filters whose capacities are coupled to the plug leads by means of peripheral electrodes, which at least partially surround the insulation coatings of the plug leads.

REFERENCES:
patent: 3452270 (1969-06-01), Cook
patent: 3942102 (1976-03-01), Kuhn et al.
patent: 4006403 (1977-02-01), Olsen et al.
patent: 4331921 (1982-05-01), Walker
patent: 4333054 (1982-06-01), Walker
patent: 4349782 (1982-09-01), Doss

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