Spark ignition timing control system for internal combustion eng

Details Spark ignition timing control system for internal combustion eng Spark ignition timing control system for internal combustion eng

1979-11-19

1982-06-22

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123602, F02P 508

Patent

active

043356923

ABSTRACT:
An ignition timing control system for retarding the spark of a spark plug wherein the ignition timing is regulated to be practically constant while the engine speed is within a low range, but wherein the ignition timing is retarded in proportion to an increase in engine speed as the engine speed increases over a given speed. The system is applicable to capacitive discharge ignition systems and includes a control circuit for triggering the capacitive discharge system as a function of engine speed. The control circuit includes a pick-up coil for generating a voltage having an amplitude proportional to engine speed, and for providing a trigger signal at the peak of the voltage waveform when the voltage waveform is below a preset value. When the voltage waveform exceeds this value, as determined by a limit circuit, the trigger signal is generated as the voltage waveform falls from its peak and reaches the preset value. A zener diode may be used to set the limit or preset value, and several embodiments of suitable control circuits are illustrated.

REFERENCES:
patent: 3515109 (1970-06-01), Farr
patent: 3722488 (1973-03-01), Swift et al.
patent: 3861372 (1975-01-01), Shibukawa et al.
patent: 3866589 (1975-02-01), Haubner et al.
patent: 4132208 (1979-01-01), Yukawa
patent: 4150652 (1979-04-01), Nagasawa
patent: 4204490 (1980-05-01), Ohki et al.

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