Vehicle direction detection using tone ring

Details Vehicle direction detection using tone ring Vehicle direction detection using tone ring

2006-10-03

2006-10-03

Lefkowitz, Edward (Department: 2862)

Electricity: measuring and testing

Electrical speed measuring

Including 'event' sensing means

C324S179000

Reexamination Certificate

active

07116096

ABSTRACT:
A tone ring preferably for use in a braking system of a vehicle has a first pattern of excitation indicative of speed of rotation of the tone ring, and a second pattern of excitation including frequency variations that is indicative of direction of rotation of the tone ring. The tone ring is rotated past a sensor, preferably a 2-wire passive sensor. A series of events are sensed during rotation of the tone ring past the sensor. The timing of occurrence of the events is detected and, on the basis of the timing detection, the direction of rotation of the tone ring is determined.

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