Ignition circuit

Details Ignition circuit Ignition circuit

1976-12-27

1978-10-03

Myhre, Charles J.

Internal-combustion engines

Igniters

Incandescent

315209T, 315218, 123149D, F02P 108, H05B 4100

Patent

active

041178203

ABSTRACT:
An ignition circuit for use in an internal combustion engine comprises a magnet generator mechanically connected to a crank shaft of the engine. A first transistor is turned on and off by an alternating voltage signal from the magnet generator. A power transistor forms a closed circuit in cooperation with a high voltage transformer and a current source. The power transistor is controlled by a control signal from the first transistor so as to form a primary current which is abruptly cut off. The transformer induces a high voltage which is supplied for a spark plug in response to abrupt interception of the primary current. A delay element composed of a resistor and a capacitor is connected to a base of the first transistor. A second transistor which is inserted between the delay element and ground has a base connected to the current source through contacts which are closed depending on operating condition of the engine, such as a temperature of cooling water, opening angle of throttle valve and gear position which thereby provide for a delay in the ignition timing.

REFERENCES:
patent: 3575154 (1971-04-01), Taylor
patent: 3645246 (1972-02-01), Campbell et al.
patent: 3783850 (1974-01-01), Habert
patent: 3938485 (1976-02-01), Yoshizu et al.
patent: 4020816 (1977-05-01), Chateau
patent: 4030468 (1977-06-01), Sugiwa et al.
patent: 4046124 (1977-09-01), Long

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