Diagnostic detection for hall effect digital gear tooth sensors

Details Diagnostic detection for hall effect digital gear tooth sensors Diagnostic detection for hall effect digital gear tooth sensors

1995-05-31

1998-12-01

Snow, Walter E.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

3242072, 32420712, H01H 3102, G01P 344, G01P 348, G01B 700

Patent

active

058444114

ABSTRACT:
The present invention provides a diagnostic circuit for detecting fault conditions in a Hall effect digital gear tooth sensor in a vehicle's four-wheel drive system. The diagnostic circuit includes a voltage divider circuit connected to a window comparator circuit which is interfaced with a four-wheel drive system controller. Fault conditions, normally difficult to detect in a Hall effect sensor because of the usual open collector configuration, are detected and identified depending on the type and location of the fault. In an alternate embodiment, a safety feature is added to the voltage divider circuit to indicate a fault and prevent gear shifting in the event that the supply voltage and ground wires are inadvertently reversed.

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Electrical Design News, vol. 30, No. 16, Jul. 1985, US, p. 282.

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