| 摘要 |
PURPOSE: A control circuit of an ABS(Anti-lock Brake System) for a vehicle is provided to prevent an actuating fluid from rapidly coming out to a storage tank. CONSTITUTION: A control circuit of an ABS for a vehicle includes a brake line(30) forming a passage through which braking pressure generated from a master cylinder(10) is supplied to wheel brakes(20), an HCU(Hydraulic Control Unit) controlling the brake line, an ECU(Electronic Control Unit) controlling the HCU. The HCU includes an inlet solenoid valve(41), which is usually open, installed to the brake line situated to the upper side of the wheel brake, and an outlet solenoid valve(42), which is usually shut, installed to a reflux line(31) situated to the lower side of the wheel brake. The ECU receives a wheel speed signal by a speed sensor of a wheel and calculates each wheel acceleration and deceleration speed and then outputs an opening and shutting signal to the inlet and outlet solenoid valves, and an operating signal to the reflux line. The control circuit comprises a suction line(32) connected to a storage tank mounted to a master cylinder(10). An orifice(60) is installed to the upper side of a branched point of the suction line.
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