Anti-skid control apparatus for a vehicle braking system
First Claim
1. An anti-skid control apparatus for a vehicle braking system, comprising:
- (A) master cylinder means, a plurality of wheels, and a wheel cylinder means associated with said wheels;
(B) a control unit for judging or measuring skid conditions of said wheels;
(C) fluid pressure control valve means, arranged between said master cylinder means and said wheel cylinder means, receiving instructions from said control unit to control brake fluid pressure of said wheel cylinder means;
(D) hydraulic reservoir means for reserving brake fluid discharged through said fluid pressure control valve means from said wheel cylinder means to lower said brake fluid pressure of the wheel cylinder means with the control of said fluid pressure control valve means;
(E) fluid pressure pump means including an inlet means and an outlet means for pressurizing the discharged brake fluid of said hydraulic reservoir means and supplying the pressurized brake fluid into a conduit connecting said master cylinder means with said wheel cylinder means;
(F) said fluid pressure control valve means being movable between at least a first and second position, in said first position said fluid pressure control valve means allows said master cylinder means to communicate with said wheel cylinder means and in said second position said fluid pressure control valve means allows said wheel cylinder means to communicate with said hydraulic reservoir means and interrupts communication between said master cylinder means and said wheel cylinder means, and(G) means for circulating said brake fluid discharged from said wheel cylinder means when said fluid pressure control valve means is in said second position through a path consisting of a first conduit connecting the outlet means of said fluid pressure pump means directly with said wheel cylinder means, a second conduit connecting said wheel cylinder means with said fluid pressure control valve means and a third conduit connecting said fluid pressure control valve means through said hydraulic reservoir means with the inlet means of said fluid pressure pump means, wherein said circulating means includes a controllable check valve arranged in said first conduit connecting the outlet means of said fluid pressure pump means directly with said wheel means, and said hydraulic reservoir means includes a reservoir chamber and a piston, said anti-skid apparatus further comprising a check valve connected in a conduit connecting said master cylinder means and said outlet means of the fluid pressure pump means, said check valve permitting fluid to flow only in the direction from said outlet of the fluid pressure pump means toward said master cylinder means, said controllable check valve normally allowing said fluid pressure pump means and said wheel cylinder means to freely communicate with each other and functioning as a check valve to permit fluid flow only in the direction from said wheel cylinder means toward the outlet means of said fluid pressure pump means when said piston is moved more than a predetermined distance or when fluid pressure becomes higher than a predetermined value in the reservoir chamber of said hydraulic reservoir means.
2 Assignments
0 Petitions
Accused Products
Abstract
An anti-skid control apparatus for a vehicle braking system includes a fluid pressure control valve arranged between a master cylinder and a wheel cylinder of a wheel brake apparatus, and receiving instructions from a control unit for judging or measuring skid conditions of wheels to control brake fluid pressure of the wheel cylinder. The apparatus includes a hydraulic reservoir for reserving brake fluid discharged through the fluid pressure control valve from the wheel cylinder to lower the brake fluid pressure of the wheel cylinder with the control of the fluid pressure control valve and a fluid pressure pump for pressurizing the discharged brake fluid of the hydraulic reservoir and supplying the pressurized brake fluid into a conduit between the master cylinder and the wheel cylinder. The fluid pressure control valve is changeable over into at least two positions, making the master cylinder and the wheel cylinder communicate with each in the first of the two positions, and making the wheel cylinder and the hydraulic reservoir communicate with each other in the second position of the two positions, while making the master cylinder and the wheel cylinder interrupt each other. The apparatus also includes members for circulating the brake fluid discharged from the wheel cylinder in the second position of the fluid pressure control valve through a path such as the outlet of the fluid pressure pump through the hydraulic reservoir and then through the inlet of the fluid pressure pump.
17 Citations
9 Claims
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1. An anti-skid control apparatus for a vehicle braking system, comprising:
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(A) master cylinder means, a plurality of wheels, and a wheel cylinder means associated with said wheels; (B) a control unit for judging or measuring skid conditions of said wheels; (C) fluid pressure control valve means, arranged between said master cylinder means and said wheel cylinder means, receiving instructions from said control unit to control brake fluid pressure of said wheel cylinder means; (D) hydraulic reservoir means for reserving brake fluid discharged through said fluid pressure control valve means from said wheel cylinder means to lower said brake fluid pressure of the wheel cylinder means with the control of said fluid pressure control valve means; (E) fluid pressure pump means including an inlet means and an outlet means for pressurizing the discharged brake fluid of said hydraulic reservoir means and supplying the pressurized brake fluid into a conduit connecting said master cylinder means with said wheel cylinder means; (F) said fluid pressure control valve means being movable between at least a first and second position, in said first position said fluid pressure control valve means allows said master cylinder means to communicate with said wheel cylinder means and in said second position said fluid pressure control valve means allows said wheel cylinder means to communicate with said hydraulic reservoir means and interrupts communication between said master cylinder means and said wheel cylinder means, and (G) means for circulating said brake fluid discharged from said wheel cylinder means when said fluid pressure control valve means is in said second position through a path consisting of a first conduit connecting the outlet means of said fluid pressure pump means directly with said wheel cylinder means, a second conduit connecting said wheel cylinder means with said fluid pressure control valve means and a third conduit connecting said fluid pressure control valve means through said hydraulic reservoir means with the inlet means of said fluid pressure pump means, wherein said circulating means includes a controllable check valve arranged in said first conduit connecting the outlet means of said fluid pressure pump means directly with said wheel means, and said hydraulic reservoir means includes a reservoir chamber and a piston, said anti-skid apparatus further comprising a check valve connected in a conduit connecting said master cylinder means and said outlet means of the fluid pressure pump means, said check valve permitting fluid to flow only in the direction from said outlet of the fluid pressure pump means toward said master cylinder means, said controllable check valve normally allowing said fluid pressure pump means and said wheel cylinder means to freely communicate with each other and functioning as a check valve to permit fluid flow only in the direction from said wheel cylinder means toward the outlet means of said fluid pressure pump means when said piston is moved more than a predetermined distance or when fluid pressure becomes higher than a predetermined value in the reservoir chamber of said hydraulic reservoir means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification