Abstract: A system for controlling traffic for allowing passage of an emergency vehicle through an intersection controlled by traffic signals includes an intersection module for transmitting signals for preempting the traffic signals and one or more circuit cards coupled to the intersection module. Each expansion card includes a plurality of contact closures for outputting one or more of the signals for preempting the traffic signals. The intersection module selects an expansion card based on a type of output desired, and further selects one or more contact closures of the selected card for the desired output. The expansion cards allow preempt or vehicle outputs beyond the output that a single card can provide. According to another embodiment, the output expansion is achieved by emulating the communication interface between the intersection module and the traffic signal controller.

Abstract: A composite hydraulic system for a work vehicle which has two separate hydraulic circuits. Included in the composite system are three pumps, two of which supply the two circuits on the vehicle. A third pump transfers hydraulic fluid between the two hydraulic circuits. An engine operates all three pumps simultaneously and means are provided whereby the third pump under certain conditions operates as a motor to provide regeneration.

Abstract: Improved apparatus for counting particle contamination in a liquid which is adapted for either on-line or bottle sampling. It includes a hydraulic cylinder and piston arranged to be actuated to eject a measured volume of sample liquid through a particle counter and sensor device at a pressure which will drive liquid entrained air into solution or compress the same such that air bubbles will not be counted. The measured volume is effected by operating the particle counter device only during piston travel between predetermined locations in the cylinder with the cylinder liquid connected to a hydraulic system only through the counter device. Valving is provided for operator selection of on-line or bottle sampling. When no sample is being taken a portion of the liquid flowing in a main hydraulic system flows through conduit means which is a part of the sampling circuit in parallel with a portion of the main circuit, of which conduit means the cylinder forms a part.

Abstract: A method for measuring the volume of air entrained in hydraulic fluid by using improved apparatus for measuring separately the particle contamination count in the fluid and the air bubble entrainment plus the particle contamination count, the difference of which equals the air entrainment count from which the volume of air entrained is determinable.