Internal-combustion engines – High tension ignition system – Using capacitive storage and discharge for spark energy
Patent
1986-08-05
1987-09-29
Argenbright, Tony M.
Internal-combustion engines
High tension ignition system
Using capacitive storage and discharge for spark energy
123605, 123656, F02P 308
Patent
active
046962808
ABSTRACT:
A high-tension Capacitor Discharge Ignition apparatus for internal combustion engines is supplied with battery low voltage and generates high voltage utilizing a push-pull amplifier controlled by a pulse-width modulator operating in the audio frequency range and with a thyristor. A capacitor is charged from the high voltage and is triggered by the thyristor to discharge its stored potential through the primary windings of an ignition coil, the thyristor being triggered at its gate by engine ignition pulses blocked by switching-off of the high voltage power source. The voltage present at the thyristor gate is continually applied to at least one comparator and serves as an information source for the thyristor's operating condition. The comparator, based upon its comparison of the thyristor gate voltage with a predetermined reference voltage, generates a signal for deactivating the high voltage source so long as the thyristor remains in its conductive condition. A diode arranged in series connection with a parallel choke and resistor shunts the primary windings of the ignition coil.
REFERENCES:
patent: 3517260 (1970-06-01), Oishi
patent: 3677253 (1972-07-01), Oishi et al.
patent: 3838328 (1974-09-01), Lundy
patent: 4069801 (1978-01-01), Stevens
patent: 4502454 (1985-03-01), Hamai et al.
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