Method and apparatus for driving an auxiliary device of an internal combustion engine
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United States of America Patent
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May 26, 1992
Grant Date -
N/A
app pub date -
Feb 22, 1990
filing date -
Jun 22, 1988
priority date (Note) -
Expired
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Abstract
A method and an apparatus for driving an auxiliary device of an internal combustion engine according to the present invention is directed to preventing an over revolution of an engine by detecting a speed of the revolution of the engine, regardless the magnitude of an induced voltage of a primary winding of an ignition device. To accomplish the object, 1 a time width of one cycle at a rated speed N1 of an engine is set as a reference time T1, 2 a reference signal V1 is produced for a time T1-T2 starting from a point t2 which is a fall point of a delay time T2, which is started from a rise point t0 of a primary current i of an ignition device and is shorter than the reference time T1, 3 a search signal V2 is produced from the rise point t0, and when the reference signal V1 of a preceding cycle and the search signal V2 of a succeeding cycle are produced simultaneously, a drive signal V4 is produced for a time that the reference signal V1 and the search signal V2 are superposed on each other, and 4 said drive signal V4 is applied to drive an auxiliary device 6 mounted to an internal combustion engine.
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