Braking device

Details Braking device Braking device

1998-03-25

2000-02-15

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 11, 303DIG1, 303DIG2, 137529, B60T 840

Patent

active

060244240

ABSTRACT:
A braking system comprises a main pump supplying a fluid pressure to an intermediate circuit section between a master cylinder and a wheel cylinder, a fluid pressure control valve controlling wheel cylinder brake fluid pressure. By driving the pump and controlling the valve, a control unit controls the braking force independently of the driver's brake operation to achieve a vehicle stability control. A relief valve is disposed in a relief circuit bypassing a gate valve between the master cylinder and the wheel cylinder. The relief valve has a movable valve element having an opening pressure receiving portion for receiving a downstream pressure of the gate valve, and a closing pressure receiving portion receiving a fluid pressure in a closing pressure chamber. The closing pressure chamber is separated from the relief circuit, and the pressure in the closing pressure chamber is independent of the pressure in the relief circuit.

REFERENCES:
patent: 4618189 (1986-10-01), Nakanishi et al.
patent: 5015043 (1991-05-01), Resch
patent: 5076647 (1991-12-01), Grana et al.
patent: 5330258 (1994-07-01), Hoshoya et al.
patent: 5472268 (1995-12-01), Ando et al.
patent: 5857754 (1999-01-01), Fukami et al.

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