A control system includes one or more processing circuits comprising one or more memory devices coupled to one or more processors. The one or more memory devices are configured to store instructions thereon that, when executed by the one or more processors, cause the one or more processors to acquire speed data regarding current speeds of tractive elements of the vehicle from tractive element speed sensors of the vehicle, determine speed references for the tractive elements to perform autonomous driving operations where the speed references indicate speeds at which each of the tractive elements should rotate to accommodate the autonomous driving operations, and control at least one of a driveline or a brake system of the vehicle to selectively alter the current speeds of the tractive elements of the vehicle based on the current speeds and the speed references to accommodate the autonomous driving operations.

A brake system includes a reservoir and a motor-driven master cylinder operable during a backup braking mode by actuation of an electric motor of the master cylinder to generate brake actuating pressure for hydraulically actuating the pair of front wheel brakes and the pair of rear wheel brakes. A power transmission unit is configured for selectively providing pressurized hydraulic fluid to a PTU output for actuating the pair of front wheel brakes and the pair of rear wheel brakes in a normal non-failure braking mode. First and second two-position three-way valves are each hydraulically connected with the master cylinder, the power transmission unit, and a selected pair of the front and rear wheel brakes. Each of the first and second three-way valves selectively controls hydraulic fluid flow from a chosen one of the master cylinder and the power transmission unit to the selected pair of front and rear wheel brakes.

An on-board brake system mounted in an autonomous vehicle comprises a brake unit, a first brake actuator and a second brake actuator for driving the brake unit, and a main ECU for controlling drive of the first and second brake actuators; the second brake actuator is an accumulating actuator; and when an emergency stop switch is depressed, the main ECU operates only the second brake actuator or operates the second brake actuator with precedence over the first brake actuator.

According to at least one embodiment, the present disclosure provides a brake system for a vehicle which includes a 3-way solenoid valve to reduce the number of solenoid valves mounted to the brake system.

The present disclosure relates to a solenoid valve. The solenoid valve includes an armature provided inside the sleeve, a plunger configured to ascend and descend by the operation of the armature, an elastic member configured to press the plunger toward the armature, a magnet core having a through hole in which the plunger and the elastic member are provided and forming an inner space in a longitudinal direction, a valve seat provided in the inner space and on which an orifice penetrating in an axial direction is formed to be opened and closed by the plunger, and a plurality of flow resistance members each including a ring body interposed between the valve seat and the magnet core to generate a flow resistance of a braking fluid, and a slot formed at one side of the ring body to penetrate through the ring body so that the braking fluid passes therethrough.

The invention relates to a valve arrangement (10) comprising valves and coil arrangements (20), each coil arrangement (20) having two coils (110, 210) which are electrically connected to separate control units (100, 200). Each valve can be independently actuated by either the first coil (110) or the second coil (210) of the coil arrangement (20) associated therewith. The invention further relates to a brake system (400, 500) having such a valve arrangement (10).

An electro-hydraulic brake system includes a master cylinder (MC) configured to supply fluid into a first MC fluid passageway in response to pressing force on a brake pedal; a pressure supply unit (PSU) assembly having a PSU motor coupled to a ball screw actuator, a PSU housing defining a piston bore having a terminal end opposite the PSU motor, and a PSU piston dividing the piston bore into a first chamber and a second chamber and movable by the ball screw actuator, with each of the first chamber and the second chamber containing a hydraulic fluid; and a backup pump assembly including a pump for supplying the brake fluid to at least one of the wheel brakes. The ball screw actuator includes an actuator nut assembly having a plurality of ball bearings each disposed within the piston bore and submerged in the hydraulic fluid.

One embodiment provides a circuit board having a substrate and an electrode portion which is provided on the substrate. The electrode portion includes: a quadrangular land which is provided on a front surface of the substrate; a solder layer which is laminated on the whole of a front surface of the land; and a pad which is joined to a front surface of the solder layer. When the electrode portion is seen from thereabove, an outer circumferential line of the pad touches each of four sides of the land. Exposed portions where the solder layer is exposed are formed individually at four corners of a front surface of the electrode portion. And, the exposed portions are formed to have the same shape.

A brake control system of the present disclosure calibrates a servo valve and calculates a calibrated transfer function associated with the servo valve for precise braking in open-loop mode. The calibration steps may include determining i) whether an aircraft is on a ground surface, ii) whether the aircraft is not moving relative to the ground surface, and iii) whether braking is applied to a brake system of the aircraft. The brake control unit may calibrate the servo valve in response to the brake control unit determining that i) the aircraft is on the ground surface, ii) the aircraft is not moving relative to the ground surface, and iii) the braking is not applied to the brake system of the aircraft. The calibration process includes sending two or more test currents to the servo valve, and determining braking pressures associated with those test currents to calculate the transfer function.

A brake system for hydraulically actuating a pair of front wheel brakes and a pair of rear wheel brakes includes master cylinder fluidly connected to a reservoir and operable to provide a brake signal responsive to actuation of a brake pedal connected thereto. The master cylinder is selectively operable in a manual push-through mode. First and second power transmission units are in fluid communication with the reservoir and selected front and rear wheel brakes. An electronic control unit selectively controls at least one of the first and second power transmission units. First and second two-position three-way valves are each hydraulically connected with a respective power transmission unit, the master cylinder, and a respective front wheel brake. The first and second two-position three-way valves are configured to place the master cylinder in push-through fluid-supplying connection with at least a corresponding one of the pair of front wheel brakes.