Digital timing circuit for a rotating machine
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United States of America Patent
Stats
-
Jan 24, 1984
Grant Date -
N/A
app pub date -
Mar 1, 1982
filing date -
Mar 1, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ignition system for a rotating internal combustion engine is provided with a digital timing circuit for determining speed-responsive ignition advance angles, responsive to a rotating armature having teeth which are unequally spaced, the unequal spaces between teeth being used to identify one particular tooth. The time required for the passage of a tooth is a measure of rotational speed, which determines advance angle. The circuit causes a dwell period to start at the leading edge of the identified tooth, computes an advance angle from previously determined rotational speed, and provides an ignition spark at an angle corresponding to the difference between the tooth angle and the actual advance angle, and stores this angle. Upon the passage of the leading edge of the next tooth, the ignition spark will occur at the stored angle.
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