Discharge ignition apparatus for internal combustion engine having shut-off feature
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United States of America Patent
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-
Nov 3, 1998
Grant Date -
N/A
app pub date -
Jun 27, 1997
filing date -
Jun 27, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved capacitive discharge ignition apparatus includes disable circuitry for permitting shut-off of the engine. The disable circuitry is operative to gate the discharge SCR, thereby shorting current that would otherwise charge the storage capacitor. A portion of the charging current is diverted through a transistor to the SCR gate. The transistor is rendered conductive for a predetermined time by a RC circuit connected to its base. The RC circuit is charged by momentary contact of a user-actuated switch. The time constant of the RC circuit is preferably selected to achieve engine stoppage under any anticipated operating conditions.
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