Vehicle braking system for drive wheels, having means for delaying commencement of brake pressure change

Claim 1

A braking system including a hydraulically operated brake for braking a drive wheel of a motor vehicle driven by a drive system, comprising: slip-detecting means for detecting an amount of slip of said drive wheel and producing output signals indicative of the detected amounts of slip of the drive wheel; pressure-regulating control means connected to said slip-detecting means, for increasing or decreasing a fluid pressure to be applied to said brake in response to each output signal whose value indicates a pressure-increase or pressure-decrease condition which requires an increase or decrease in said fluid pressure, respectively, whereby the amount of slip of said drive wheel is maintained within an optimum range; and delay means operative to reduce a tendency of resonance of the drive system by commanding said pressure-regulating control means to delay commencement of pressure-increasing control, upon the establishment of at least one of a plurality of occurrences of said pressure-increase condition and irrespective of the magnitude of said fluid pressure at a point of time at which the at least one pressure-increase condition is established, said delay to continue for a predetermined time duration from said point of time such that during said delay, no pressure-increasing control is effected, said pressure-regulating control means commencing the delayed pressure-increasing control to increase said fluid pressure, upon expiration of aid predetermined time duration.