Fault detection scheme for a variable reluctance sensor interfac

Details Fault detection scheme for a variable reluctance sensor interfac Fault detection scheme for a variable reluctance sensor interfac

1994-02-22

1996-02-20

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

32420712, 32420725, 324225, G01B 730, G01B 714, G01P 348, G01P 354

Patent

active

054932149

ABSTRACT:
In accordance with the teachings of the present invention, a fault detection circuit is provided which detects short circuits on differential leads associated with a magnetic sensor and modifies said differential voltage to avoid possible errors associated with a short circuit. The circuit includes a first and second input coupled to first and second signal lines for receiving a differential voltage. A first voltage comparator compares voltage potentials at the first and second signal lines so as to detect equal voltage crossings and provide an output in response thereto. A rectifier is coupled to the first and second signal lines in the output of the first comparator and has first and second outputs for producing positive half-wave voltage cycles with a voltage potential at each of the first and second lead lines. A second comparator is provided for comparing the half-wave voltage cycles with a first threshold voltage that represents a short circuit power source. A third comparator is provided for comparing the half-wave voltage cycles with a second threshold voltage that represents a short circuit to ground. The voltage potentials at the first and second signal lines are converted to separate single-ended voltages when one of the second and third voltage comparators detects a short circuit so as to correct for possible errors caused by the short circuit.

REFERENCES:
patent: 3801830 (1974-04-01), Boyer
patent: 4866298 (1989-09-01), Kniss et al.
patent: 4868498 (1989-09-01), Lusinchi et al.
patent: 4962470 (1990-10-01), Hansen
patent: 5029286 (1991-07-01), Kirschner
patent: 5144233 (1992-09-01), Christenson et al.
David K. Long, "An Adaptive Sense Amplifier For Engine Control Applications", Paper No. 770435, Society of Automotive Engineers International Automotive Engineering Congress and Exposition, Cobo Hall, Detroit, Michigan Feb. 28-Mar. 4, 1977.

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