Frequency control, and sensing circuit

Fluid-pressure and analogous brake systems – Pipeless valves

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Details

235 92FQ, 235 92NT, 235 92AE, 303 95, 303107, 361242, 2351502, B60T 808

Patent

active

040336336

ABSTRACT:
An oscillator is connected to a backward counter to set the backward counter to a count number representative of its frequency of oscillation, the backward counter being stepped down by clock pulses recurring at a frequency high with respect to the cycling rate of the oscillator until it reaches a reference value, for example zero. The difference between the reference value and the count state of the counter when a predetermined counting period has elapsed, as determined by the duration of one cycle of the input signal, forms an error signal which is transmitted over a bi-directional counter to an integrator which, in turn, controls the oscillator. The system is particularly applicable for use in connection with vehicle wheel brake anti-lock arrangements, and permits determination of wheel speed by oscillation of the oscillator as well as acceleration and deceleration by sensing the error signal.

REFERENCES:
patent: 3674318 (1972-07-01), Hickner
patent: 3840277 (1974-10-01), Bouthors
patent: 3843210 (1974-10-01), Portas

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