Abstract: Vehicle speed is measured during slip-free travel of the wheels and compared with the wheel speeds to determine correction values which correct for different wheel diameters. The correction values are used to continuously correct the wheel speeds.

Abstract: A drive slip regulating system is described, in which the speeds of the drive wheels are compared with one another and as a function of the deviation .DELTA. v a set-point brake pressure is calculated, with which the excessively spinning wheel is to be braked. In the pulsed furnishing of the brake pressure, the valve opening times are calculated, taking the pressure buildup function into account, in such a way that the actual brake pressure corresponds to the set-point brake pressure.

Abstract: A failsafing device is proposed for an anti-skid system of a tractor-trailer combination. If the trailer anti-skid system fails at the rear axle, instead of shutting off the entire anti-skid system of the trailer, the anti-skid control at the front axle of the trailer is maintained.

Abstract: A versatile system for preventing spinning of driving wheels, especially for commercial road vehicles, is provided by a braking control system in which a logic system responds not only to positive slip (overdriving) of each driven wheel, but also to negative slip (overbraking) thereof and, likewise, not only to over-acceleration, but also to excessive deceleration of the driven wheels. The cycle of control is started by an over-acceleration signal and terminates by the timing-out of a control phase in which hydraulic brake pressure is reduced. Within a control cycle, brake pressure builds up for a driven wheel in response to the simultaneous occurrence of any one of the following four pairs of conditions at that wheel: (a) presence of over-acceleration and of negative slip; (b) presence of over-acceleration and of positive slip; (c) presence of over-acceleration and absence of negative slip, and (d) presence of over-deceleration and of positive slip.