A trailer brake system may include a trailer brake controller comprising a manual braking control, and a trailer light controller; where the trailer brake controller comprises a brake on/off relay, which responds to the manual braking control.

A method for finding an optimum trailer gain, comprising: applying trailer brake pulses to a trailer while a vehicle is coasting using a trailer brake of a trailer, wherein the trailer is coupled to the vehicle; monitoring an average deceleration of the vehicle and the trailer brake gain of the trailer brake pulses applied to the trailer while the vehicle is coasting; generating a graph of the average deceleration of the vehicle versus the trailer brake gain, wherein the graph includes a curve that illustrates a relationship between the average deceleration of the vehicle and the trailer brake gain of the trailer brake pulses applied to the trailer while the vehicle is coasting; and finding a bend point of the curve in the graph to determine an optimum trailer brake gain.

An off-road vehicle includes a driveline, a control system, and a braking system. The driveline provides driveline power and driveline brake power to a first tractive assembly and/or a second tractive assembly. The control system stores vehicle information, determines driving instructions based on environment data, and determines speed references for tractive elements of the first and second tractive assemblies based on the driving instructions and the vehicle information. The braking system includes brakes and a braking subsystem. The brake subsystem operates the brakes to provide brake power to one or more components of the first and/or second tractive assemblies. The brake controller controls the brakes to selectively provide the brake power and the control system controls the driveline to selectively provide the driveline power and the driveline brake power based on current speeds of the tractive elements and the speed references to accommodate the driving instructions.

A brake system for a trailer has first and second pneumatic circuits for supplying air pressure to the wheel ends on the trailer. The air pressure to brake devices at the wheel ends is controllable via a first brake ECU. First and second pressure control valves control pressure from the pneumatic circuits to the respective wheel ends. The system further has a second ECU adapted to electrically control the actuation of the pressure control valves.

The disclosure relates to a method for controlling an electronically controllable pneumatic braking system for a towing vehicle. The towing vehicle has front axle brake actuators and rear axle brake actuators; a primary system with a primary control unit for controlling the front and rear axle brake actuators; a secondary system with a secondary control unit for controlling the front and rear axle brake actuators in the event that a fault is detected in the primary system and the braking system is controlled by the secondary system; a trailer control valve for providing a trailer brake pressure at a trailer brake pressure port; and a PLC connector for receiving PLC signals from a trailer. The method includes: providing PLC signals received at the PLC connection both in the primary system and in the secondary system; and processing PLC signals in both the primary system and the secondary system.

An electropneumatic trailer control module (1) includes a trailer control connection (6) configured to deliver a trailer control pressure (pTC), an electropneumatic trailer control valve arrangement (20) configured to receive a supply pressure (pS) and to provide the trailer control pressure (pTC) and an electronic trailer control connection (24) for providing trailer braking control signals (STB) such that the trailer control pressure (pTC) can be modulated. The electropneumatic trailer control module (1) is characterized by a protection connection (10) for receiving a pneumatic protection pressure (pPR), and a tractor protection unit (22) configured to switch between a supply state (60) and a protection state (56). The invention further relates to an electropneumatic braking system (100), a vehicle (200) and a method (300) for controlling a trailer supply function of an electropneumatic braking system (100).

A vehicle braking system including a control unit (340) which is operable to communicate with at least one sensor (320, 350), the sensor (320, 350) being operable to provide signals corresponding to a characteristic of a vehicle to the control unit (340), and the control unit (340) being in communication with a brake demand source (300) to receive brake demand data, and the control unit (340) also being in communication with a plurality of wheel end units, each wheel end unit including a brake torque control unit (310) which is operable to control an associated brake actuator to apply a braking torque dependent upon a signal received from the control unit (340).

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 method performed by a control unit comprised in a vehicle for controlling a distribution of service brake activation between a first vehicle unit and a second vehicle unit of the vehicle is provided. The control unit determines a first periodic brake adjustment and a second periodic brake adjustment to be applied to an electric propulsion system and a service brake system of the vehicle. The control unit determines the first and second periodic brake adjustment, respectively, to adjust a retardation of the vehicle by less than a retardation threshold. The control unit applies the first periodic brake adjustment to the electric propulsion system of the vehicle and applies the second periodic brake adjustment to the service brake system of the vehicle. Applying the first periodic brake adjustment comprises periodically adjusting a charging power of the electric propulsion system of the vehicle. Applying the second periodic brake adjustment comprises periodically adjusting a brake pressure applied to the service brake system of the vehicle. Periodically adjusting the brake pressure applied to the service brake system triggers the service brake system to periodically activate one or more second service brakes of the second vehicle unit of the vehicle.

A vehicle includes: a brake pedal to produce vehicle brake pressure; a trailer brake valve to output a variable trailer brake pressure to a trailer brake of a trailer, the trailer brake valve configured to output the variable trailer brake pressure as a function of the vehicle brake pressure; and an electronic control unit operably coupled to the trailer brake valve and configured to: output a first valve signal to the trailer brake valve to output the trailer brake pressure according to a first vehicle brake pressure curve; and output a second valve signal to the trailer brake valve to output the trailer brake pressure according to a second vehicle brake pressure curve responsively to determining a curve adjustment condition exists. The first vehicle brake pressure curve and/or the second vehicle brake pressure curve is not a single straight line curve.