| 摘要 |
PURPOSE:To optimumly control braking operation by detecting precise slip rate and friction coefficient of a road surface at drive wheels during running of a vehicle so that the brake operation is controlled at a slip rate which is fixed such that a maximum friction coefficient is obtained being adapted to the friction coefficient of the road surface during braking operation. CONSTITUTION:There are provided a sensor 4 for detecting the speed of a wheel 3 and a sensor 9 for detecting the absolute speed of a vehicle from which signals are delivered to a control unit 1 whose control signal is delivered to a hydraulic unit 2. Further, when a brake pedal 8 is depressed so that a master cylinder 7 exerts braking pressure to a brake 5, the hydraulic unit 2 controls a hydraulic control valve 6 to adjust the braking pressure to an optimum value in order to prevent the wheel being locked. In this arrangement, precise slip rate and friction coefficient of the road surface are detected during running of the vehicle so as to control the braking operation in such a way that the slip rate is fixed to obtain a maximum friction coefficient adapted to the friction coefficient of the road surface during braking operation.
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