Abstract: An articulated work machine determines the relative orientation of two members of the machine utilizing output from inertia sensors mounted on the members. The machine includes a first frame and a second frame having a body and a chassis, the body pivotally connected to the chassis at a pivot point. The first and second frames are connected by a coupling and are movable relative to each other in at least one direction. The machine includes a first multi-axis inertia sensor attached to the first frame providing an output relating to the position of the first frame, and a second multi-axis inertia sensor attached to the body providing an output relating to the position of the body. The machine further includes a controller configured to compare the outputs of the first and second multi-axis inertia sensors to calculate the position of the body and the first frame relative to each other.

Abstract: A brake system for an air braked trailer includes a first control line for transmitting air from a source, a second control line for transmitting air, a relay valve allowing air to flow therethrough, and a pneumatic control module (PCM) having structure for reducing pressure from an inlet port of the PCM to an outlet port of the PCM. The PCM is connected to the first control line and is solely connected to the relay valve by the second control line. The first and second control lines are capable of being decoupled from the PCM and being coupled to each other to remove the PCM from the system so that a technician can check the system. An exhaust valve is integrally connected with the PCM and is capable of exhausting air to atmosphere. When the system is used on trailer, the PCM is mounted away from the relay valve, and preferably forwardly of a forward axle of the trailer.