초록 ▼

A brake fluid pressure control apparatus in a skid control system includes electromagnetic valves arranged between a master cylinder and a wheel cylinder, receiving control signals of a control unit measuring the skid condition of the wheel to control a brake fluid pressure to the wheel cylinder; a

A brake fluid pressure control apparatus in a skid control system includes electromagnetic valves arranged between a master cylinder and a wheel cylinder, receiving control signals of a control unit measuring the skid condition of the wheel to control a brake fluid pressure to the wheel cylinder; a hydraulic reservoir reserving the brake fluid discharged through the electromagnetic valves from the wheel cylinder; a pressure fluid supply conduit connecting the master cylinder with the electromagnetic valves and containing a first check valve which allows the flow of fluid in the direction of the electromagnetic valves; a fluid pump for returning brake fluid from the hydraulic reservoir into a portion of the fluid pressure supply conduit between the first check valve and the electromagnetic valves; a pressure fluid return conduit connecting the master cylinder with the wheel cylinder and containing a second check valve which allows the flow of fluid in the direction of the master cylinder; and a controllable check valve device arranged in the pressure fluid supply conduit, including the first check valve and a control portion responsive to a fluid pressure of the master cylinder or the outlet of the fluid pump, the control portion controlling to permit the first check valve to make the free communication between the master cylinder and the electromagnetic valves when the fluid pressure to the control portion is lower than a predetermined pressure.

대표청구항 ▼

A brake fluid pressure control apparatus in a skid control system for a vehicle having at least one wheel and a brake for the wheel comprising: (A) a fluid pressure control valve device arranged between a master cylinder and a wheel cylinder of a brake for the wheel, said fluid pressure control valv

A brake fluid pressure control apparatus in a skid control system for a vehicle having at least one wheel and a brake for the wheel comprising: (A) a fluid pressure control valve device arranged between a master cylinder and a wheel cylinder of a brake for the wheel, said fluid pressure control valve device receiving control signals of a control unit measuring the skid condition of the wheel to control the brake fluid pressure to said wheel cylinder; (B) a hydraulic reservoir which, when the brake fluid pressure to said wheel cylinder is decreased with control of said fluid pressure control valve device, reserves the brake fluid discharged through said fluid pressure control valve device from said wheel cylinder; (C) a pressure fluid supply conduit connecting said master cylinder with said fluid pressure control valve device; (D) a fluid pump for returning the brake fluid from said hydraulic reservoir into said pressure fluid supply conduit; and (E) a controllable check valve device arranged in said pressure fluid supply conduit, including a control portion responsive to a fluid pressure of the master cylinder or the outlet of the pump, said control portion permitting said controllable check valve device to make the free communication between said master cylinder and said fluid pressure control valve device when said fluid pressure to the control portion is lower than a predetermined pressure, and permitting said controllable check valve device to open when said fluid pressure to the control portion is higher than said predetermined pressure, and only when brake fluid flows from said master cylinder toward said fluid pressure control valve device, and the outlet of said fluid pump being connected to said pressure fluid supply conduit between said controllable check valve device and said fluid pressure control valve device.