| 摘要 |
PURPOSE:To enable both vehicle speed and deceleration to be smoothly lowered to zero and completely prevent shake back by providing a fluid pressure brake system, a vehicle speed detecting means, and a means of exponentially lowering fluid pressure after lowering a detected vehicle speed to a reference speed. CONSTITUTION:When the pressing force to a pedal 170 is large with respect to the friction coefficient of a road surface, the slip ratio of a front wheel 176 increases above a proper range, and a controller 252 which receives this from the detected signal of a sensor 246 feeds a current to the solenoid of an electromagnetic control valve 192 to shut off the valve 192 or to switch over it to a pressure drop allowable condition while starting a pump 216. And, in the case of the shut off condition, a wheel cylinder 180 is disconnected from a master cylinder 174 and a reservoir 210 to keep a hydraulic pressure constant, thereby, keeping the braking force to the front wheel 176 constant. In the case of the pressure drop allowable condition, on the other hand, the cylinder 180 is connected to the reservoir 210 and a brake fluid from the cylinder 180 is stored in the reservoir 210 and scooped up and returned to a passage 176 by means of the pump 216.
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