Electricity: measuring and testing – Magnetic – Displacement
Patent
1991-07-24
1993-03-23
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
123617, 307540, 307564, 324163, 32420715, H03K 508, G01B 730, G01P 344
Patent
active
051967936
ABSTRACT:
An apparatus for developing a signal voltage that represents the angular position of the crankshaft of an internal combustion engine. The apparatus includes a variable reluctance sensor that has a pick-up coil. The sensor is associated with means driven by the crankshaft of the engine for causing an alternating voltage to be induced in the pick-up coil as the crankshaft rotates. The apparatus includes a negative voltage clamp which clamps the voltage of a junction of the clamp circuit to substantially ground potential during negative half-cycles of the alternating voltage induced in the pick-up coil. The clamp circuit is adapted to be connected to a control circuit that is an integrated circuit having a bulk substrate diode. The clamp circuit prevents forward biasing of the bulk substrate diode.
REFERENCES:
patent: 3382378 (1968-05-01), Akmenkalns
patent: 3937988 (1976-02-01), DeClue et al.
patent: 4027177 (1977-05-01), Davis
patent: 4324216 (1982-04-01), Johnson et al.
patent: 4926073 (1990-05-01), Pigott et al.
patent: 5015879 (1991-05-01), Lasagna et al.
Good Brian K.
Kearney Mark B.
Shreve John R.
Whitlock William P.
Delco Electronics Corporation
Meland Creighton R.
Strecker Gerard R.
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