Central hydraulics brake system
AssigneeGeneral Motors Corporation
InventorsViswanath Seetharaman, Dale Lee Baldauf, Donald Edward Schenk, William Vincent Jacob
Life of this patent
Estimating the term…
Abstract
A pressure control solenoid based vehicle braking system utilizes intensifiers to permit the hydraulic control components to operate at lower pressures. A method of selectively locking the intensifiers in position is provided. Unique pressure regulators provide predictable control of load pressure and are isolated in the system by a combination of enable valves and the locking method.
Claims14
A braking system comprising:
- a wheel brake;
- a pump;
- a hydraulic network connecting the pump to the wheel brake including an intensifier;
- pressure regulator connected in the hydraulic network between the pump and the intensifier;
- an enable valve being normally closed and connected in the hydraulic network between the pump and the pressure regulator;
- and a means for actuating the enable valve wherein the means for actuating the enable valve includes a three way normally closed solenoid operated valve.
A braking system comprising:
- a wheel brake;
- a pump operable to generate a fluid pressure in the braking system;
- a pressure regulator regulating the fluid pressure;
- an enable valve being normally closed and connected in the braking system between the pump and the pressure regulator;
- an intensifier connected in the braking system between the pressure regulator and the wheel brake;
- and
- means for locking the intensifier wherein the means for locking the intensifier include a lock valve that is pilot operated wherein the enable valve is pilot operated and further comprising a three-way solenoid operated valve connected to the enable valve and the lock valve operable to effect pilot operation of the enable valve and the lock valve.
A braking system having two independent channels providing independent braking control for first and second wheel brakes comprising:
- a pump;
- a reservoir;
- a normally closed three port enable solenoid valve communicating with the pump and the reservoir;
- a first pressure regulator disposed in the braking system between the pump and the first wheel brake;
- a second pressure regulator disposed in the braking system between the pump and the second wheel brake;
- a pilot operated enable valve disposed in the braking system between the pump and both the first and second pressure regulators responsive to the normally closed three-port enable solenoid valve;
- a first intensifier disposed in the braking system between the first pressure regulator and the first wheel brake;
- a second intensifier disposed in the braking system between the second pressure regulator and the second wheel brake;
- and
- means for locking the first and second intensifiers.
Dependencies are inferred from the claim text.