Crankshaft angular position voltage developing apparatus having

Details Crankshaft angular position voltage developing apparatus having Crankshaft angular position voltage developing apparatus having

1991-08-30

1992-09-01

Wieder, Kenneth A.

Electricity: measuring and testing

Magnetic

Displacement

328 31, 324173, G01B 730, G01P 3489

Patent

active

051442337

ABSTRACT:
Apparatus for developing a series of square-wave pulses from an alternating voltage that is generated in the pick-up coil of a variable reluctance sensor that is associated with a slotted wheel that is driven by the crankshaft of an internal combustion engine. The system has an adaptive control which comprises a peak detector, a capacitor and a voltage comparator. The capacitor is charged to a peak voltage that corresponds to the peak value fo the positive half-cycles of the alternating voltage. The comparator is connected to compare the peak voltage and a voltage that corresponds to the magnitude of the positive half-cycles. A diode is connected between the pick-up coil and the peak detector which prevents charging of the capacitor and accordingly prevents adaptive control until the voltage induced in the pick-up coil is high enough to cause the diode to conduct in the forward direction.

REFERENCES:
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Long, "An Adaptive Sense Amplifier For Engine Control Applications", S.A.E. paper no. 770435, Feb. 28-Mar. 4, 1977, pp. 1-5.

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