Abstract: A vehicle train comprising a tractor and at least two trailers wherein each trailer has a brake sub-system. The brake sub-system includes a pressure transducer on the trailer responsive to pressure of a fluid pressure brake demand signals supplied thereto to provide an electrical brake demand signal and an electronic controller on the trailer responsive to the electrical brake demand signal to provide an electrical brake operating signal. The brake sub-system also includes a brake valve on the trailer responsive to the electrical brake operating signal supplied to the brake valve by the electronic controller to supply fluid to an actuator to operate a trailer brake under a brake pressure, from a primary source, determined in accordance with the electrical brake operating signal.

Abstract: A braking system for a vehicle, having a transducer capable of responding to a fluid pressure brake demand signal to provide an electrical brake demand signal to an electronic control means which is responsive to the electrical brake demand signal to provide an electrical brake operating signal. The electrical brake operating signal is supplied to an electrically operable valve means which is arranged to supply a fluid pressure brake operating signal from a source of fluid under pressure to control a supply valve which supplied fluid from the source to at least one actuator for brake application under a brake pressure determined in accordance with the electrical brake operating signal. An electrically operable fluid pressure brake demand signal control valve controls the supply of the fluid pressure brake demand signal to the supply valve as a substitute for the fluid pressure brake operating signal originating from the source.

Abstract: An electronically controlled braking system having a driver operated control 11 for providing an electrical braking demand signal and a fluid pressure back-up supply; an electronic control 10, 139 is responsive to the electrical braking demand signal, and brake valves 12, 13, 14, 15 are responsive to an instructing signal supplied to the brake valves by the electronic control 10, 139 to control supply of fluid under pressure from a source 20 to at least one actuator 16, 17, 18, 19 for brake application. The fluid pressure back-up supply is also fed to the brake valve and a shuttle valve 134 is provided to feed the back-up supply to the actuator 16, 17, 18, 19 if the electronic control 10, 139 fails.

Abstract: A vehicle braking system has a controller responsive to wheel speed signals for sensing skid conditions of the wheels and for generating skid control instructions. A primary fluid pressure supply includes a fluid pressure source and a fluid pressure reservoir and wheel brakes are responsive to brake pressure supplied to the brakes by supply valves, each of which is adapted to supply fluid brake pressure to a different wheel brake or brakes from the primary supply in accordance with a brake operating signal which can be modulated by skid control units. Each pair of supply valve and skid control unit is adapted to control the fluid pressure of a different wheel brake or brakes. A plurality of brake operating signals are generated, independently of the skid control units, as a function of a brake command signal and a brake operating signal is supplied for each of the supply valves. All the components are connected together so as to be mountable on the vehicle as a discrete unit.

Abstract: A vehicle braking system including a braking sub-system comprising; a brake actuator responsive to a brake operating pressure supplied thereto to operate a brake; a supply valve having a fluid pressure inlet and a brake operating pressure outlet connected to the actuator; a control line connected to the supply valve to supply a fluid pressure control signal to which the supply valve is responsive to supply brake operating pressure to the actuator; a pair of solenoid valves in the control line and a managing device responsive to a wheel speed signal to energize the solenoid valves so as to effect one ofa) interruption in the supply of the brake operating pressure to the actuator;b) interruption in the supply of the brake operating pressure to the actuator and exhaust of the brake operating pressure from the actuator;characterized by the provision of a plurality of the braking sub-systems and by the managing device being arranged to energize the solenoid valves of the sub-systems such that the current consumpti

Abstract: Brakes (1,2; 3,4) on the wheels (5,6; 7,8) at opposite ends of a common axle are each controlled by a separate skid control unti and a single latch valve (21) common to both units closes at the first skid point to be sensed by a sensor (9,10; 11,12) on either wheel. A control module (13) responsive to signals from at least one of the sensors is operative to operate the latch valve and the skid control unit for the respective wheel. When a skid-signal is detected from a sensor on only one wheel the latch valve closes and the brake on the skidding wheel is released and re-applied when the skid signal terminates. The brake is re-applied in a fast first stage, due to pressure from an associated memory chanber and thereafter in a slower second stage due to the latch valve restricting the increase of braking pressure when it is closed. The rate of increase of brake pressure of the non-skidding wheel is restricted to that of the slow stage from the time that the latch valve is closed due to the other wheel skidding.

Abstract: Brakes (3, 4) on the wheels (7, 8) on a common axle are each controlled by a separate skid control unit (16, 17) each including a memory chamber (33, 34), and a single latch valve (21) common to both units closes at the first skid point to be sensed by a sensor (11, 12) on each wheel. The rate of re-application of the two brakes is controlled in response to signals from the individual sensors, but at rates of pressure increase determined by each respective memory chamber, and by flows of pressure controlled by restrictors (47).