Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1977-01-10
1977-09-27
Blix, Trygve M.
Fluid-pressure and analogous brake systems
Pipeless valves
364424, 307233R, 324 78D, 324166, 361240, 364565, B60T 802
Patent
active
040507475
ABSTRACT:
A wheel speed measuring apparatus is provided for use in an anti-skid brake control system such that a digital speed signal is obtained having good accuracy without resorting to expensive manufacturing methods to assure exact conformity of the teeth and teeth spaces of the rotor member of the wheel sensor device used in the anti-skid control system. The speed measuring apparatus consists of at least two corresponding portions, each consisting of a control unit, a counter and a data register. The control unit of one portion responds to a positive polarity transition of the square wave signal generated by the wheel sensor, while the control unit of the other portion responds to negative polarity transitions, to initiate operation of the respective counters. The count output of each counter therefore provides a digital speed signal corresponding to a full cycle duration of the square wave signal, with one cycle overlapping the other to compensate for any deviations in the half-cycle durations due to size differences in the teeth and spaces of the rotor member of the sensor that generates the square wave signal.
REFERENCES:
patent: 3757167 (1973-09-01), Yoshikawa
patent: 3937525 (1976-02-01), Luhdorff
Gudat Wolfgang
Hesse Karl-Heinz
Liermann Peter
Ruhnau Gerhard
Blix Trygve M.
Eisenzopf Reinhard J.
McIntire, Jr. R. W.
WABCO Westinghouse GmbH
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