A trailer diagnostic and monitoring system includes a system controller having a controller body, and a power unit for engage a wiring harness of the trailer. A location identification unit and wireless communication device are positioned within the controller body, and a plurality of hub sensor assemblies are positioned along the axle hubs of the trailer. Each of the assemblies including functionality for monitoring and reporting the temperature of a respective axle hub, and the pressure of the trailer tire secured to the respective axle hub. A process specific serial forwarder device communicatively links each of the hub sensor assemblies to the system controller. A trailer diagnostic and monitoring application for execution on a remote computing device includes functionality for communicating with the wireless communication device to receive trailer location information, tire pressure readings and axle hub temperatures.

Method and apparatus are disclosed for controlling a TPMS sensor of a vehicle tire. An example vehicle includes a communication module, a tire, and a TPMS sensor corresponding to the tire. The TPMS sensor is configured to receive a target pressure from the communication module, determine a modified target pressure based on vehicle data determined by a vehicle sensor, and, responsive to determining that a measured pressure differs from the modified target pressure by a threshold amount, transmit an alert to the communication module.

A load based tire pressure regulation system for trucks or trailers employing an air spring maintained at a variable pressure P.sub.AS depending upon the load on the truck or trailer, includes an air pilot pressure regulator receiving air at pressure P.sub.AS and air at the pressure of at least one tire of a truck or trailer, and configured to feed air to and bleed air from the at least one tire of the truck or trailer as a function of the load on the truck or trailer. The pressure regulator is configured to feed air to and bleed air from the at least one tire of the truck or trailer based upon the pressure of the air spring P.sub.AS as a function of the load on the air spring (F.sub.AS), and further upon the recommended pressure P.sub.T of the at least one tire as a function of the load on the tire (F.sub.T).

A tire inflation system for a small trailer may include a fluid pressure source mountable to the trailer, and fluid conduits providing sealed fluid communication between the fluid pressure source and the small trailer's pneumatic tires. The system may further include a fluid connector configured for connection to an external fluid power source.

Method for coupling a tractor with a semi-trailer and semi-truck with a tractor and a semi-trailer.

A tire pressure control device of an off-road vehicle is configured for changing tire pressures of vehicle wheels of at least one vehicle axle. Each pneumatic tire has a pressure-controlled wheel valve which is pneumatically connected to a control pressure line and to a supply pressure line. The control pressure lines and the supply pressure lines are pneumatically connected to a compressed air supply device and controlled by an electronic control unit. The actuation of the wheel valves takes place axle by axle via control valves, and the compressed air supply of the vehicle wheels is carried out by side via supply valves.

Disclosed is a method for communicating measurement messages between a plurality of electronic measurement modules and an electronic control unit of a motor vehicle. The method includes the steps of measurement (E1), by a primary emitter module, of parameter values associated with the wheel in which the module is mounted, of sending (E2), by the primary emitter module, of measurement messages to a relay module, of reception (E3) by the relay module, of the measurement messages sent, of measurement (E5), by the relay module, of parameter values associated with the wheel in which the relay module is mounted and of sending (E6), by the relay module, of the measurement messages received and of its own measurements to the electronic control unit.

A tire inflation system for a small trailer may include a fluid pressure source mountable to the trailer, and fluid conduits providing sealed fluid communication between the fluid pressure source and the small trailer's pneumatic tires. The system may further include a fluid connector configured for connection to an external fluid power source.

The dynamic footprint of a tire is received and the dynamic footprint is determined by and received from a tire pressure monitoring (TPM) sensor. A weight or load of the secondary vehicle attached to the primary vehicle is calculated based at least in part on the footprint. Instructions to alter the operation of the braking system of the secondary vehicle based on the calculated weight or load are transmitted to the secondary vehicle.

To provide a circuit with low power consumption, a semiconductor device with low power consumption, a highly reliable semiconductor device, a tire whose performance is controlled, a moving object whose performance is controlled, or a moving object with a high degree of safety. A tire provided with a semiconductor device is provided. The semiconductor device includes a circuit portion, an antenna, and a sensor element. The circuit portion includes a transistor. The transistor includes an oxide semiconductor. The sensor element is configured to measure the air pressure of the tire.