| 摘要 |
PCT No. PCT/EP88/00587 Sec. 371 Date May 8, 1989 Sec. 102(e) Date May 8, 1989 PCT Filed Jul. 4, 1988 PCT Pub. No. WO89/01890 PCT Pub. Date Mar. 9, 1989.A braking pressure regulating device, in particular an anti-lock control device for hydraulic brake systems of automotive vehicles, comprising a master cylinder and a pressure modulator for the variation of the hydraulic pressure in the wheel cylinders during the braking pressure control mode. The device is equipped with a motor-driven pump (8) for generating a hydraulic pressure and with an electronic control unit (5) for controlling the valves of the pressure modulator (2). During the braking pressure control mode, the working chambers (10, 15) of the master cylinder (16) are exposed to pump pressure. Caused by the pump pressure in the working chamber (10), the push rod piston (11) and thus the brake pedal (1) disadvantageously are returned into their basic position in prior-art devices. The present arrangement provides that the switching positions of the regulating valve incorporated in the push rod piston are shifted into the cylinder during the braking pressure control mode. Therefore the brake pedal is not fully reset during the control mode. The operating comfort of the brake pedal is thereby augmented.
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