Discharge ignition apparatus for internal combustion engine having shut-off feature
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United States of America Patent
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Jan 5, 1999
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N/A
app pub date -
Jun 25, 1997
filing date -
Jun 25, 1997
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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.
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