Electricity: measuring and testing – Electrical speed measuring – Including speed analog electrical signal generator
Patent
1998-11-25
2000-03-07
Williams, Hezron
Electricity: measuring and testing
Electrical speed measuring
Including speed analog electrical signal generator
32420725, G01P 1304, G01B 714
Patent
active
06034525&
ABSTRACT:
A system for determining the direction of rotation of the crankshaft of an internal combustion engine includes a sensor assembly for generating a crank rotation direction signal. The sensor assembly includes a stator having a sprocket fixed to the crank and having a plurality of teeth. The rotation of the crank, and the sprocket with the crank, results in changes in the magnetic field, and such changes or flux create a current in a conductor. The rotor also includes, at one angular location about the sprocket, a first interruption that serves as a first reference point or marker. The interruption in the sprocket teeth creates an irregularity in the magnetic flux and, consequently in the generated current or signal. The rotor also includes a second interruption or marker at an angle other than 1800 from the first marker. The second interruption differs physically from the first interruption, so that a second irregularity which is distinguishable from the first irregularity occurs in the generated signal. The pattern of the generated signal, in combination with the known angular displacement of the first and second markers, provides sufficient information from which the direction of rotation of the crankshaft can be readily determined.
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L. Equizabal, "Hall-effect tachometer senses speed, direction of rotation", Electronics,, Aug. 28, 1980. Vancouver, British Columbia, Canada.
Koerner Scott A.
Ng Paul T.
Kwok Helen C.
Outboard Marine Corporation
Williams Hezron
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