Internal-combustion engines – Igniters – Incandescent
Patent
1974-11-25
1976-06-08
Myhre, Charles J.
Internal-combustion engines
Igniters
Incandescent
123117R, 123149D, F02P 504, F02P 100
Patent
active
039616185
ABSTRACT:
An ignition system for a small internal combustion engine is energized by an alternator which is rotatably driven in association with the engine, and ignition pulses are supplied to the engine in timed relation with the movement of a plurality of different pistons in response to trigger signals generated by a trigger mechanism. The ignition pulses are produced by a capacitive discharge ignition circuit having a pulse transformer associated with each of the different pistons, and the energization of each pulse transformer is controlled by a corresponding switch which is actuated by a trigger signal generated in an associated trigger coil by the rotational movement of a magnetic trigger rotor driven in association with the engine. The trigger rotor carries magnetic means in association with an outer member of magnetically conductive material and having an eccentric configuration defining an intervening air gap with the trigger coil which varies with the movement of the trigger rotor. A radial slot is formed in the periphery of the outer member at a location furthest from the axis of rotation, and the magnetic means provide magnetic poles of opposite polarity on opposite sides of the radial slot to establish a magnetic field with flux reversal for generating a trigger signal of maximum magnitude at low engine speeds. To advance the timing of the ignition pulses a notch is formed in the periphery of the trigger rotor adjacent the radial slot to provide a variation in the flux density for generating a trigger signal which becomes sufficient to actuate the switches upon acceleration of the engine to a predetermined speed.
REFERENCES:
patent: 3577971 (1971-05-01), Cavil
patent: 3715650 (1973-02-01), Draxler
patent: 3729647 (1973-04-01), Mainprize
patent: 3799137 (1974-03-01), Reddy
Cox Ronald B.
Eltra Corporation
Moore Keith D.
Myhre Charles J.
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