Engine ignition system with voltage monitoring

Details Engine ignition system with voltage monitoring Engine ignition system with voltage monitoring

1977-10-26

1980-01-01

Brigance, Gerald

Internal-combustion engines

Igniters

Incandescent

315209R, F02P 900

Patent

active

041811135

ABSTRACT:
A voltage divider across the interruptor switch contacts provides a measure of the high voltage produced before a spark occurs at the sparkplug. A Zener diode connected to the upper tap of the voltage divider breaks down when this voltage has risen a certain amount as the result of wear of the sparkplug electrodes that widen the gap. The Zener voltage breakdown causes a relay to lock in and to short-circuit a current-limiting resistor in the spark coil primary circuit that allows a higher voltage spark to be produced to assure proper firing of the sparkplugs with the wider gap. Another Zener diode is connected to the lower tap of the voltage divider to sound an alarm and to disable the ignition circuit when the high voltage at which sparks strike in the sparkplug rises to a value for which the insulation of the spark coil and its connection is not designed to withstand.

REFERENCES:
patent: 3882840 (1975-05-01), Adamain et al.
patent: 3941112 (1976-03-01), Habert
patent: 3949722 (1976-04-01), Linstedt et al.
patent: 4036199 (1977-07-01), Chateau
patent: 4074665 (1978-02-01), Patis
patent: 4084567 (1978-04-01), Hachiga

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