Active brake sensor

Details Active brake sensor Active brake sensor

1992-07-20

1994-12-13

Oberleitner, Robert J.

Brakes

With condition indicator

Electrical

73130, 303 91, 340454, F16D 6600, G01L 528, B60T 1718

Patent

active

053722213

ABSTRACT:
An ultrasonic wave is propagated through a brake pad to determine various brake conditions including brake pad wear, brake status (engaged/disengaged), a wet brake failure or a brake drag failure. The propagation and reflection time of an echo signal generated at a far boundary of the pad is indicative of brake wear. Brake drum or disc speed is determined by using radial indicia on the periphery of the drum or disc to modulate an ultrasonic wave reflected from or transmitted through the drum or disc and demodulating the sensed modulated signal as a speed indication. The various other conditions are determined by means of filters, comparators and logic.

REFERENCES:
patent: 3815426 (1974-06-01), Rohner
patent: 3905235 (1975-09-01), Shaw
patent: 4266633 (1981-05-01), Barabino et al.
patent: 5009103 (1991-04-01), Sato et al.
patent: 5038615 (1991-08-01), Trulson et al.
patent: 5062298 (1992-11-01), Falcoff et al.
patent: 5228342 (1993-07-01), McShane

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