Internal combustion engine magneto-type ignition system with ele

Details Internal combustion engine magneto-type ignition system with ele Internal combustion engine magneto-type ignition system with ele

1977-08-11

1980-02-19

Myhre, Charles J.

Internal-combustion engines

Igniters

Incandescent

1231465A, 123148CC, 315209T, F02P 306, H05B 3702

Patent

active

041889290

ABSTRACT:
To provide for electronically controlled spark advance of the ignition instant in a transistorized magneto ignition system, the ignition instant is controlled by a threshold switch responsive to voltage generated by the magneto, the threshold being connected to a timing circuit which includes a resistance network therein, the resistance value of which is variable with respect to operating speed of the engine. The resistance network includes a R/C timing circuit which, as the speed of the engine increases, presents a respectively smaller resistance value to rapidly recurring signals from the magneto so that, effectively, the resistance value of the timing circuit controlling current flow through the threshold circuit is decreased, causing a shift in the ignition instant, the circuit being arranged to advance the spark with respect to upper dead center (UDC) position of the piston of the engine.

REFERENCES:
patent: Re29374 (1977-08-01), Just et al.
patent: 3587552 (1971-06-01), Varaut
patent: 3605713 (1971-09-01), Masters et al.
patent: 3704700 (1972-12-01), Wesemeyer
patent: 3745985 (1973-07-01), Hohne
patent: 3791364 (1974-02-01), Saita
patent: 3828754 (1974-08-01), Carlsson
patent: 3855985 (1974-12-01), Shirai
patent: 3963015 (1976-06-01), Haubner et al.
patent: 4064415 (1977-12-01), Blackington

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