Capacitive discharge ignition system with continuous timing advance
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United States of America Patent
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-
Jun 18, 1991
Grant Date -
N/A
app pub date -
Jun 29, 1990
filing date -
Jun 29, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A continuously advancing capacitive discharge ignition system for small internal combustion engines is disclosed in which both the negative and the positive half-cycles of the control winding output signal may be used for the continuous timing advance. Gating of the ignition SCR is controlled by applying a voltage divided first control signal to the SCR gate and a phase shifted second control signal to the SCR cathode. The predetermined voltage differential between the first control signal and the second control signal, which is reached progressively earlier with increased engine speed, is used to gate on the SCR earlier as speed increases to achieve continuous timing advance.
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