Discharge ignition apparatus for internal combustion engine havi

Details Discharge ignition apparatus for internal combustion engine havi Discharge ignition apparatus for internal combustion engine havi

1997-06-25

1999-01-05

Argenbright, Tony M.

Internal-combustion engines

High tension ignition system

Using capacitive storage and discharge for spark energy

123198DC, 123630, F02P 1100, F02B 7708

Patent

active

058551999

ABSTRACT:
An improved capacitive discharge ignition apparatus includes disable circuitry for permitting shut-off of the engine. The disable circuitry includes a SCR and a transistor in series to provide a bypass for current that would otherwise charge the ignition capacitor. The SCR is gated by a RC circuit charged by momentary contact of a user-actuated switch. The transistor is rendered conductive only during periods when a positive voltage is induced on the charge coil, thereby limiting discharge of the RC circuit. In addition, the RC circuit is regeneratively charged by a leakage current through the SCR gate. The disable circuitry thus achieves engine stoppage regardless of the time required.

REFERENCES:
patent: 3500809 (1970-03-01), Hohne et al.
patent: 4073279 (1978-02-01), Fox
patent: 4193385 (1980-03-01), Katsumata et al.
patent: 4976234 (1990-12-01), Okuda
patent: 5076250 (1991-12-01), Sasaki et al.
patent: 5190019 (1993-03-01), Harvey

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