Discharge ignition apparatus for internal combustion engine having stepped spark advance
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United States of America Patent
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-
Sep 15, 1998
Grant Date -
N/A
app pub date -
Jan 23, 1997
filing date -
Jan 23, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved capacitive discharge ignition apparatus provides a step advance in spark initiation at a predetermined threshold speed. The ignition apparatus includes two trigger circuits electrically connected to a triggering node of an electronic switch device. A triggering signal received from either trigger circuit will cause discharge of an energy storage element through the primary coil of the ignition's step-up transformer. The first trigger circuit is configured to supply an advanced triggering signal only at speeds exceeding the predetermined threshold. In addition, to enhance spark duration, the advanced triggering signal is preferably timed to occur when a sustaining potential is being otherwise induced on the secondary coil of the transformer. The second trigger circuit includes a trigger coil spaced apart from the transformer to provide a delayed triggering signal at speeds below the predetermined threshold speed.
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