Electronic ignition system

Details Electronic ignition system Electronic ignition system

1976-02-17

1978-01-24

Pendegrass, Verlin R.

Internal-combustion engines

Igniters

Incandescent

123148CB, F02P 306

Patent

active

040698017

ABSTRACT:
An electronic ignition system for an engine is connected in place of the conventional ignition system by a transfer relay that is energized when the ignition switch is closed. An energy storage capacitor is charged by the rectified output of an inverter that is driven by an oscillator and a phase splitter. Upon opening of the ignition system points, an SCR is triggered on to discharge the capacitor across the ignition coil primary. In this manner, the sparking voltage is produced without having high current switched by the points.
The electronic ignition also includes (a) a voltage doubler to insure adequate charging of the energy storage capacitor, and hence optimum spark voltage, during cranking of the engine; (b) a point cleaning circuit; (c) a point bounce eliminator circuit; (d) synchronizer means for disabling the inverter during discharge of the energy storage capacitor; (e) a shut down circuit to insure engine turn-off when the ignition switch is turned off; (f) a proper operation indicator lamp; and (g) automatic switchover to convention ignition operation in the event of electronic ignition failure.

REFERENCES:
patent: 1172698 (1916-02-01), Flynn et al.
patent: 3168891 (1965-02-01), Cook
patent: 3596646 (1971-08-01), Weiss
patent: 3651341 (1972-03-01), Shawo
patent: 3722489 (1973-03-01), Howard
Guidebook of Electronic Circuits, J. Markus, McGraw-Hill Book Co. (1974) pp. 78-80.

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