A system and method for controlling wheel brakes on a trailer in a tractor-trailer are provided. Upon receiving a command to apply a trailer wheel brake, the system determines a speed of the tractor-trailer responsive to a speed signal generated by a vehicle speed sensor. The system also estimates a threshold speed based on a level of friction between the tractor-trailer and a road surface on which the tractor-trailer is travelling. The system then generates a control signal to control delivery of fluid pressure to the trailer wheel brake. The control signal causes delivery of a first fluid pressure to the trailer wheel brake when the speed meets a predetermined condition relative to the threshold speed and a second fluid pressure, less than the first fluid pressure, when the speed does not meet the predetermined condition.

An electro-pneumatic tractor protection valve assembly (8) including a trailer supply input (84) for receiving a supply pressure, a trailer service output (87) for delivering a trailer supply pressure, a first supply input (81) for receiving a primary driver brake pressure, a second supply input (82) for receiving a secondary driver brake pressure, a dual brake valve (14) actuated by a brake pedal (10) and supplying the brake control pressures, a vent opening (86) for venting an internal conduit, a first electrically controlled pneumatic valve (92) to receive a first electric control signal for trailer assistance braking, and a trailer control output (85) for delivering a trailer brake control pressure. The valve assembly includes one single casing (8a) accommodating the first supply input (81), the second supply input (82), the trailer supply input (84), the trailer control output (85), the vent opening (86) and the trailer service output (87).

A sensor arrangement for detecting an object in a surrounding of a trailer when towed by a vehicle, the sensor arrangement including: at least one sensor mountable at a rear side of the vehicle with a field of view underneath the trailer and configured to capture a detection signal from the object; and a control unit configured to receive a sensor signal from the at least one sensor, wherein the sensor signal is indicative of the object and the control unit is configured to confirm a presence of the object behind or at a side of the trailer.

A control system for a motor vehicle includes a central tire inflation system (CTIS) controller and at least one other vehicle system controller arranged to control a system associated with the at least one other vehicle system controller. The CTIS controller controls the CTIS to cause inflation and deflation of one or more tires and is configured to cause the CTIS to operate in a selected one of a plurality of operating modes in each of which the system is configured to set a pressure of one or more tires. The CTIS controller is configured to generate and output a first signal indicative of pressure of the one or more tires, the at least one other system controller being configured to receive the first signal and to control operation of the system associated with the at least one other vehicle system controller in dependence on the first signal.

A vehicle brake system includes a hydraulic service brake system having a service brake circuit and a trailer brake control system. The trailer brake control system includes a trailer brake valve with a service brake demand input port and a trailer brake demand output port connected to a trailer brake control coupling. The output at the trailer brake demand output port is dependent on the pressure applied at the service brake demand input port. An electronic trailer brake control system has a solenoid control valve to connect the service brake demand input port to a source of pressurized hydraulic fluid to trigger an output at the trailer brake demand output port. An ECU is configured to actuate the control valve to apply the trailer brakes if it determines that the vehicle is at risk of jack-knifing. The system may also include a shuttle valve.

A method for determining unstable behavior of a trailer of a vehicle combination, the vehicle combination having N members, one of the members being a tractor vehicle and at least one further member being the trailer, the unstable behavior of the trailer being determined depending on a driving-dynamics actual characteristic variable of the tractor vehicle, includes: determining at least one driving-dynamics actual characteristic variable of the trailer, the at least one driving-dynamics actual characteristic variable characterizing a current driving-dynamics state of the trailer and following from a measurement by at least one sensor in the trailer; and determining at least one driving-dynamics target characteristic variable of the trailer, the at least one driving-dynamics target characteristic variable following from the at least one driving-dynamics actual characteristic variable of the tractor vehicle by using a kinematic model depending on geometric characteristic variables of the vehicle combination.

A traction saddle disposed on a tractor for connection with a traction pin of a trailer, is provided. The traction saddle includes a base, a gear set, and a damper. A gear carrier of the gear set fixes axial centers of the planetary gears of the gear set, the planetary gears are meshed with an inner ring gear of the gear set, and the inner ring gear is fixed to the base. The gear carrier is used for fixing the traction pin to rotate with the traction pin. The planetary gears are meshed with one end of a sun gear of the gear set to drive the sun gear to rotate, and the damper is connected to the other end of the sun gear to apply resistance to rotation of the sun gear. In addition, a traction pin, a tractor, a trailer, and a truck are also provided.

A travel control device for controlling traveling of a straddle-type vehicle includes a control device, a vehicle speed detector configured to detect a traveling speed of the vehicle, and a vibration detector configured to detect a detection target vibration which is a vibration in a yaw direction or roll direction of the vehicle and has a frequency within a reference frequency range. The control device includes a deceleration device configured to perform a deceleration control to decelerate the traveling speed if the traveling speed exceeds a control start reference speed and an amplitude of the detection target vibration exceeds a control start reference amplitude and a deceleration stop device configured to stop the deceleration control if the traveling speed becomes equal to or less than a target limited speed after the deceleration control is started by the deceleration device.

There is disclosed a control system for controlling braking of wheels in a towed vehicle comprising: an electric drum brake associated with at least one wheel of the towed vehicle for applying a braking force to the towed vehicle, the electric drum brake having at least one electro magnet for controlling application of the braking force; and a computer controller electrically coupled to each electric drum brake; wherein, the at least one electro-magnet generates an electric field through which a geometric or magnetic variation present in the electric drum brake passes through upon rotation of the wheel, the computer controller being configured to detect a response signal generated by the passing of the geometric or magnetic variation through the electric field, the response signal being indicative of the state of motion of the wheel.

A method for braking one or more trailers in a tractor-trailer combination. The method comprises establishing a maximum continuous brake pressure for trailer brakes of wheels of the one or more trailers of the tractor-trailer combination. The method further comprises establishing an on-off cycling frequency for pulsing of the brakes of the one or more trailers of the tractor-trailer combination at brake pressures above the maximum continuous brake pressure. The method further comprises establishing applying the brakes of the one or more trailers continuously at brake pressures up to the established maximum continuous brake pressure and by pulsing according to the established on-off cycling frequency at brake pressures above the established maximum continuous brake pressure.