초록 ▼

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

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.

대표청구항 ▼

[ We claim:] [6.] A vehicle hydraulic braking system of the brake-by-wire type in which at least first and second proportional solenoid-operated valves are adapted to control the pressure in wheel brake actuators of the brakes on a single axle of a vehicle under control of a control means, and a val

[ We claim:] [6.] A vehicle hydraulic braking system of the brake-by-wire type in which at least first and second proportional solenoid-operated valves are adapted to control the pressure in wheel brake actuators of the brakes on a single axle of a vehicle under control of a control means, and a valve is provided to enable individual hydraulic brake circuits to be hydraulically connected so that the pressure applied to each brake is substantially the same, said control means being adapted to select at least a first control mode in which more than one of the proportional valves is adapted to be controlled in parallel, and wherein said control means is further adapted to select between said first control mode and a second control mode in which only one of said proportional valves is adapted to control the pressure applied to said wheel brakes.