Ignition system with ignition timing retarding circuit for inter

Details Ignition system with ignition timing retarding circuit for inter Ignition system with ignition timing retarding circuit for inter

1980-05-14

1982-08-17

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Engine speed reduction by partial or complete omission of...

123602, F02D 504, F02P 100, F02D 1110

Patent

active

043443958

ABSTRACT:
An ignition system for an internal combustion engine is provided with an ignition timing retarding circuit to prevent overrunning of the engine. The ignition timing retarding circuit includes a switching circuit connected to the gate of an ignition control thyristor and a predetermined duration signal generator for generating a signal having a predetermined duration from a predetermined reference time. During the time period in which the predetermined duration signal is applied to the switching circuit, the switching circuit is maintained conductive to thereby bypass an ignition signal generated in synchronism with the crankshaft rotation and applied to the gate of the ignition control thyristor. As the engine speed increases, since the period of generation of the ignition signal is shortened, by selecting the duration of the predetermined duration signal with respect to the period of the ignition signal corresponding to a high engine speed to be prevented so that the leading end portion of the ignition signal overlaps the terminating end of the predetermined duration signal by a desired period of time or a desired degrees, the ignition timing retarded by the desired period of time or desired degrees.

REFERENCES:
patent: 4074665 (1978-02-01), Patis
patent: 4132208 (1979-06-01), Yukawa
patent: 4144859 (1979-03-01), Ohki et al.
patent: 4150652 (1979-04-01), Nagasawa
patent: 4204490 (1980-05-01), Ohki et al.

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