Low-speed compensated ignition system for an internal combustion

Details Low-speed compensated ignition system for an internal combustion Low-speed compensated ignition system for an internal combustion

1981-11-02

1982-11-02

Cox, Ronald B.

Internal-combustion engines

High tension ignition system

Having engine component position sensor

123609, 123611, 123644, 123618, F02P 504, F02P 100

Patent

active

043568084

ABSTRACT:
A switching transistor (7, 9) is serially connected with the primary (5) of an ignition coil; current flow therethrough is controlled from an a-c signal generator (16) with respect to an ON threshold level (Ue) to store electromagnetic energy, and an OFF threshold level (Ua) to generate a spark; a variable conductivity circuit (26) controlled from a sensing resistor (8) modifies the response level of the threshold switch (13) with respect to the null or cross-over level of the applied signal. To prevent excessive current flow under idle-speed conditions, in accordance with the invention, the ON threshold level, at least, of the switch is shifted by introducing an auxiliary bias voltage derived from an auxiliary capacitor (36) and connected (37, 38) by the signal source through a diode (38) which prevents application of an auxiliary bias voltage to the threshold switch (13) under extremely low, e.g. starting conditions, permits application of the additional bias voltage providing for shift of the ON response level (Ue) under idling conditions, but again loses control as the speed continues to increase, and control by the variable conductivity circuit takes over.

REFERENCES:
patent: 3882840 (1975-05-01), Adamian
patent: 4167927 (1979-09-01), Mikami
patent: 4176645 (1979-12-01), Junot
patent: 4280461 (1981-07-01), Okuda

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