Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1996-01-31
1999-07-20
Snow, Walter E.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324173, 32420712, G01P 3481, G01P 348, G01P 354, G01R 33025
Patent
active
059260165
ABSTRACT:
A multi-channel wheel speed sensor having a custom integrated interface circuit. The interface circuit is configured with voltage programmable threshold adjustment allowing the circuit sensitivity to be specially tuned to detect wheel speeds in very specific ranges for a variety of applications. This feature can be implemented in ABS and/or traction control systems wherein in ABS mode a lower sensitivity adjustment can be used since wheel speeds below 5 mph do not need to sensed and processed precisely and in traction control mode very low wheel speeds, 1-1.5 mph are sensed and processed especially at non-drive wheels which provide speed reference for slipping or spinning drive wheels. The interface circuit is also configured with a test circuit for testing the integrity of the speed sensors and for providing information to the controller about the sensor/tone wheel gap.
REFERENCES:
patent: 4847556 (1989-07-01), Langley
patent: 5103171 (1992-04-01), Petersen
patent: 5359238 (1994-10-01), Lesko
AlliedSignal Truck Brake Systems Company
Massung Howard G.
Snow Walter E.
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