| 摘要 |
An automotive brake control system with a skid control hydraulic unit and a pressure apply pump-and-piston device, comprises a single motor having a driving connection both an ABS return pump and a pressure apply pump, a circulation circuit being connected between a pressure introduction chamber of a pressure apply piston unit and a pressure apply suction circuit of the pressure apply pump, and a circulation mode-select valve disposed in the circulation circuit for opening and closing of the latter. The circulation mode-select valve comprises a normally-open valve. An electronic control unit is provided for closing the circulation mode-select valve only during the traction-and-yaw control in which a pressure apply action of the pressure apply piston unit is required.
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