Abstract: An anti-skid brake control system includes a device for detecting the friction level of a road surface. The system performs mutually different modes of arithmetic operation for deriving wheel acceleration data on the basis of wheel speed monitoring data. Respective modes of arithmetic operations are provided different levels of response characteristics and noise elimination levels adapted for road friction levels. The system selects one of the arithmetic operation modes for deriving the wheel acceleration data depending upon the friction level on the road surface.

Abstract: Automotive brake control is performed by controlling brake pressure at front and rear wheels independently. The braking force at each of the front and rear wheels is controlled in accordance with monitored vehicle driving conditions so that the steering characteristics of the vehicle are held to predetermined characteristics even when vehicular brakes are applied during cornering. The braking pressure at front wheels is decreased when understeer characteristics increases due to braking. On the other hand, the braking pressure at the rear wheel is decreased when oversteer characteristics increases due to braking.

Abstract: An anti-skid brake control system for an automotive vehicle, is able to achieve both of satisfactory braking characteristics and cornering stability. The anti-skid brake control system is variable of wheel slippage criteria depending upon a magnitude of transverse force exerts on the vehicle for achieving both of the desired level of braking performance and sufficient cornering stability for suppressing undesirable vehicle behavior in transverse direction. Therefore, the an anti-skid brake control system, according to the present invention, controls application and release of an automotive brake system by comparing wheel speed with a wheel slippage criteria. The system is also detective of transverse force exerting on the vehicle body for varying the wheel slippage criteria so that wheel slippage criteria is set in a level assuring sufficient level of cornering force against the transverse force for satisfactory level of the cornering stability of the vehicle.