Transistorized ignition system for internal combustion engines

Details Transistorized ignition system for internal combustion engines Transistorized ignition system for internal combustion engines

1976-07-21

1978-12-19

Bentley, Stephen C.

Internal-combustion engines

Igniters

Incandescent

315209T, F02P 900, F02P 1100

Patent

active

041301013

ABSTRACT:
To provide for gradual turn-off of an ignition coil current control transistor, a control capacitor which provides turn-off current has its charge state changed gradually by means of an auxiliary transistor so connected to the capacitor that the conduction of the emitter-collector path of the auxiliary transistor is gradually changed, the main switching transistor being connected to and controlled by the auxiliary transistor and likewise changing gradually from conductive to blocking state in dependence on the gradual change in conduction of the emitter-collector path of the auxiliary transistor to prevent rapid turn-off of the main switching transistor and hence an undesired pulse at the secondary of the ignition coil which may induce continued operation of the internal combustion engine even though the ignition has been turned off.

REFERENCES:
patent: 3745985 (1973-07-01), Hohne
patent: 3972315 (1976-08-01), Munden et al.
patent: 4010726 (1977-03-01), Kondo

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