Circuit arrangement for producing a digital speed signal corresp

Details Circuit arrangement for producing a digital speed signal corresp Circuit arrangement for producing a digital speed signal corresp

1976-12-09

1977-11-01

Kunin, Stephen G.

Fluid-pressure and analogous brake systems

Pipeless valves

180105E, 364426, 364565, 303 95, 324160, 324166, 340263, 361238, 361239, B60T 802

Patent

active

040562875

ABSTRACT:
In a circuit for producing a digital wheel speed signal from the duration of a half cycle alternation of the sinusoidal waveform produced by a wheel sensor, there is provided a control unit which operates a first counter until it reaches a count corresponding to the duration of the half cycle alternation of the sinusoidal waveform and in response to this occurrence effects operation of a second counter until the first counter reaches a predetermined final stage. A signal representing the duration of a half cycle alternation, which is inversely proportional to the angular wheel velocity is thus converted by the control unit so as to produce a wheel speed signal that is directly proportional to the angular wheel velocity. According to the present invention, the pulse frequency supplied to at least one of the first and second counters is adjusted according to the stage of the counter so as to change exponentially and thereby provide for faster generation of the wheel speed signal.

REFERENCES:
patent: 3744854 (1973-07-01), Ooya et al.
patent: 3757167 (1973-09-01), Yoshikawa et al.
patent: 3885137 (1975-05-01), Ooya et al.
Bederman, S., Computer and Apparatus for Measuring Rotational Speed, IBM Technical Disclosure Bulletin, vol. 13, No. 4, Sept. 1970.

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