Brake pressure controller

摘要

A compact brake pressure controller that can be produced at relatively low cost and which is capable of pressurizing a wheel cylinder quickly through use of a hydraulic pump includes shut-off valves provided between a master cylinder and pressure increasing valves, and suction valves alternatively permitting and preventing brake fluid flow through the suction paths. Restricted passages are also provided between the shut-off valves and the pressure increasing valves. As applied to traction control, when the speed of the driving wheels exceeds the speed of the driven wheels by an amount in the excess of a first predetermined value, the suction valves are opened and the hydraulic pumps are driven to supply brake fluid in the master cylinder to the wheel cylinders. When the speed of the driving wheels exceeds the speed of the driven wheels by an amount in excess of a second predetermined value which is greater than the first predetermined value, the shut-off valves are closed and hydraulic pumps are driven to further supply the brake fluid in the master cylinder to the wheel cylinders.