Speed-dependent ignition time advancement apparatus in magneto g

Details Speed-dependent ignition time advancement apparatus in magneto g Speed-dependent ignition time advancement apparatus in magneto g

1978-02-02

1979-12-18

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123148E, 315209T, F02P 504, H03K 1764

Patent

active

041788923

ABSTRACT:
In an ignition system having a magneto, the ignition timing is advanced when the engine speed exceeds a predetermined speed, by abruptly changing the voltage applied to the base of a transistor having an emitter-collector circuit connected in series with the primary winding of the ignition coil. The change in base voltage is such that the primary current flowing before the ignition time is decreased, increasing the primary voltage and thereby advancing the ignition time when the speed of the engine reaches the predetermined speed. The abrupt change is generated by opening or closing a switch which connects a resistor in series or parallel, respectively, with a resistor connected to the base of the transistor. The speed dependent switch may be a transistor whose conductive or non-conductive state is determined by the charge and discharge of a capacitor which, in turn, varies as a function of engine speed.

REFERENCES:
patent: 3277875 (1966-10-01), Miki
patent: 3626455 (1971-12-01), Toda et al.
patent: 3900016 (1975-08-01), Haubner et al.
patent: 3948239 (1976-04-01), Katsumata
patent: 3965878 (1976-06-01), Salway
patent: 3985109 (1976-10-01), Kondo et al.
patent: 4086895 (1978-05-01), Habert
patent: 4119868 (1978-10-01), Schach et al.

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