Importance

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Abstract

An anti-lock brake control system for vehicles with braked wheels comprising a wheel speed sensor for producing a signal proportional to wheel speed; a first switch having an input connected to the sensor to receive the wheel speed signal and being adapted to respond to the rate of change of said signal so as to produce a first control pulse to effect brake pressure release while a preset first wheel deceleration threshold is exceeded; a second switch that is triggered under the control of the first control pulse and which, when triggered, initiates a second control pulse to effect brake pressure release; and a charge storage device that receives the wheel speed signal so that it accumulates a charge dependent on the dip in wheel speed and discharges in response to wheel speed recovery following said dip in wheel speed, and which is associated with the first and second switches so that it discharges in a predetermined manner after the first control pulse terminates and terminates the second control pulse when the stored charge falls to a predetermined level. Preferably, both switches are deceleration sensing switches that respond to the rate of change of the wheel speed signal, the second switch having a predetermined second wheel deceleration threshold, but said second threshold being reduced or removed by the first control pulse when this is produced by the first switch at the first threshold. Preferably, the charge storage device is a capacitor connected in series in the input connection from the sensor to the second switch.

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First Claim