Engine ignition system with variable spark internal duration

Details Engine ignition system with variable spark internal duration Engine ignition system with variable spark internal duration

1977-10-26

1979-12-04

Myhre, Charles J.

Internal-combustion engines

Igniters

Incandescent

123117R, F02P 304, F02P 500

Patent

active

041766440

ABSTRACT:
An RC circuit branch determines the duration of the period for which the primary circuit of a spark coil remains interrupted after the main peak of the spark discharge in the secondary circuit that includes a spark plug. Engine speed and engine temperature are used to shorten the period during which the secondary circuit is allowed to entertain a spark discharge. As engine speed increases the spark discharge period is reduced until a certain speed is reached after which the spark discharge period remains constant with further increase of engine speed. Engine temperature is also used to shorten the spark discharge period by the use of a temperature sensitive resistor. The charging and discharging of the storage capacitor of the RC circuit branch are separately controlled by the shunt circuits in which diodes are interposed and in one embodiment an additional capacitor can be switched into parallel into the RC circuit branch when the engine is starting up. The degree of intake manifold vacuum can also be used to modify the operation of the circuit.

REFERENCES:
patent: 3559629 (1971-02-01), Sauvignet
patent: 3587552 (1971-06-01), Varaut
patent: 3605713 (1971-09-01), Masters et al.
patent: 3841288 (1974-10-01), Korteling
patent: 3881458 (1975-05-01), Roozenbeek et al.
patent: 3890944 (1975-06-01), Werner et al.
patent: 4051827 (1977-10-01), Capurka et al.

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