Rotation direction detector in ignition equipment of an internal combustion engine
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United States of America Patent
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Feb 17, 2004
Grant Date -
Jun 27, 2002
app pub date -
Oct 12, 2001
filing date -
Oct 13, 2000
priority date (Note) -
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Abstract
Apparatus and method for detecting the direction of rotation of an internal combustion engine using a magnet wheel which moves past an electrical ignition coil. For each revolution, at least one current or voltage pulse is induced in the coil having a polarity dependent on the direction of rotation. The magnet poles and the coil have geometric relationships that, upon each magnet wheel revolution, the curve form of the current or voltage pulse has at least two prespecified extreme points with a curve characteristic which is substantially neither rising nor falling and at least one break point with a discontinuity. A direction of rotation signal is derived from these curve characteristics.
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