Internal-combustion engines – High tension ignition system – Having specific trigger circuitry
Patent
1980-05-05
1982-05-18
Lall, P. S.
Internal-combustion engines
High tension ignition system
Having specific trigger circuitry
123633, 123425, F02P 504, F02P 900
Patent
active
043299709
ABSTRACT:
A spark ignited internal combustion engine includes a spark coil in which current is turned on and off to generate spark events. A triangular wave voltage generator and comparator combine to retard the spark events from spark timing signals, the voltage ramping in one direction toward a reference in response to a spark timing signal and ramping in the other direction when the comparator senses that the voltage equals the reference, at which time a spark event is initiated. An RF clamp clamps the input to the comparator to prevent initiation of a spark event from each spark event to the following spark timing event. A minimum burn timer may be initiated by the comparator to prevent current flow in the spark coil for a minimum predetermined time after the initiation of a spark event; and the RF clamp may include a timer to delay its initiation sufficiently to allow latching of the minimum burn timer.
REFERENCES:
patent: 3991730 (1976-11-01), Crall
patent: 3991733 (1976-11-01), Harris
patent: 4106447 (1978-08-01), West
patent: 4202304 (1980-05-01), Jundt et al.
patent: 4249506 (1981-02-01), Tada
patent: 4253442 (1981-03-01), Jundt et al.
General Motors Corporation
Lall P. S.
Sigler Robert M.
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