Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-11-16
1991-08-27
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303115, 303116, B60T 842
Patent
active
050428853
ABSTRACT:
An integrated anti-lock braking (ABS)/traction control (TC) braking system in a preferred embodiment is provided for a vehicle having a fluid actuated brake including a system controller cognizant of the condition of the wheel, a master cylinder for delivering pressurized fluid to the wheel brake, an actuator frame with a bore being fluidly connected with the master cylinder and the wheel brake, first fluid line fluidly connecting the master cylinder with the wheel brake, a valve for preventing fluid communication between said master cylinder and the wheel brake through the first fluid line when the controller places the braking system in an ABS mode, a valve for preventing fluid communication between the first fluid line or the actuator bore and the master cylinder when the controller places the braking system in a TC mode, a first piston slidably mounted in the bore with a valve opening portion, a mechanism to reversibly move the piston in response to the controller, and a valve piston slidably mounted within the bore sealably separating the bore connections with the master cylinder and the wheel brake and the valve piston having a check valve preventing fluid communication from the master cylinder to the wheel brake when the first piston is nonadjacent to the valve piston and the check valve allowing fluid communication between the master cylinder and the wheel brake through the bore when the first piston valve opening portion contacts the check valve. A method of using the above mentioned apparatus is also provided.
REFERENCES:
patent: 3420580 (1969-01-01), Dymond
patent: 3824895 (1974-07-01), Martin
patent: 4025124 (1977-05-01), Fuchs
patent: 4743075 (1988-05-01), Belart et al.
patent: 4756391 (1988-07-01), Agarwal et al.
General Motors Corporation
Graham Matthew C.
Helms Ernest E.
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