Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-10-16
2000-06-13
Schwartz, Christopher P.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031161, 3031135, B60T 836
Patent
active
060740191
ABSTRACT:
A vehicle hydraulic braking system of the brake-by-wire type is disclosed in which proportional solenoid-operated valves (12, 13) are adapted to control the pressure in wheel brake actuators of the brakes (8, 9) on a single axle of a vehicle, and a balance valve (20) is provided to enable individual hydraulic brake circuits to be hydraulically connected so that the pressure applied to each brake is guaranteed to be substantially the same, a first one (13) of the proportional valves (12, 13) is adapted to be isolated so that the hydraulic circuit is fed by a second, single, proportional valve (12). Applying both brakes under the control of a single proportional valve ensures that any fluid leakages are balanced since substantially equal brake-applying pressures are generated. An alternative vehicle hydraulic braking system of the brake-by-wire type is also disclosed in which a control module (3) is provided which is adapted to select between at least a first control mode (104) in which more than one of the proportional valves (12, 13) is adapted to be controlled in parallel and a second control mode (103) in which only one of the proportional valves (12, 13) is operated to control the pressure in the wheel brake actuators.
REFERENCES:
patent: 4743076 (1988-05-01), Davis et al.
patent: 4861115 (1989-08-01), Petersen
patent: 5004300 (1991-04-01), Brearley et al.
patent: 5021957 (1991-06-01), Yoshino et al.
patent: 5294190 (1994-03-01), Feldman et al.
patent: 5302008 (1994-04-01), Miyake et al.
patent: 5632532 (1997-05-01), Ohoka et al.
Harris Alan Leslie
Howell Mark Leighton
Martin Peter
Phillips Mark Ian
Worsdorfer Karl Friedrich
Lucas Industries Public Limited Company
Schwartz Christopher P.
Sy Mariano
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