Integral control and isolation valve proportional brake system
AssigneeGeneral Motors Corporation
InventorsGary Lee Johnston, James William Zehnder, II, William Charles Kruckemeyer, Michael Leslie Oliver
Life of this patent
Estimating the term…
Abstract
In a vehicle braking system, integral control and isolation valves are used to individually control the brake line pressure to each wheel brake and to provide pedal isolation for each brake channel. The system is operable on a single fluid or a separated fluid system with an integrated power source. Full proportional anti-lock braking and traction control is provided to each selected wheel independently. The system is applicable as a two, three or four channel base brake system.
Claims9
A brake system operating on fluid pressure comprising:
- a master cylinder;
- an artificial pedal feel device;
- a brake;
- a powered fluid supply;
- and
- a valve, selectively positionable in a first position providing fluid communication between the master cylinder and the brake and in a second automatically controlled range of positions providing modulated fluid communication between the powered fluid supply and the brake while providing constantly open fluid communication between the master cylinder and the artificial pedal feel device.
A brake system comprising:
- a manually actuated master cylinder;
- a powered fluid supply;
- a fluid return;
- a brake;
- and
- an integral control and isolation valve having an automatic position and a base brake position, the positions corresponding to first and second modes of operation, the first mode of operation characterized by positioning the integral control and isolation valve in the automatic position wherein the brake is automatically modulated between being in fluid communication with the powered fluid supply and the fluid return while the master cylinder is out of communication with the brake and the second mode of operation characterized by positioning the integral control and isolation valve in the base brake position wherein the brake is in fluid communication with the manually actuated master cylinder.
A brake system operating on fluid pressure having an automatic mode and a base brake mode of operation comprising:
- a brake;
- a pressurized fluid supply;
- a fluid return system;
- a manually actuated master cylinder;
- an artificial pedal feel device;
- and
- an integral control and isolation valve having a port A in fluid communication with the brake, in the automatic mode the port A being automatically modulated between being closed, being in fluid communication with a port P that is in fluid communication with the pressurized fluid supply and being in fluid communication with a port T that is in fluid communication with the fluid return system, and the integral control and isolation valve having a port C that is in fluid communication with the manually actuated master cylinder and a port B in fluid communication with an artificial pedal feel device, and wherein, in the base brake mode the port A is in fluid communication with the port C and the port B is closed and in the automatic mode the port C is in constant fluid communication with the port B.
Dependencies are inferred from the claim text.