• US 20100097038A1
  • Filed: 11/23/2009
  • Published: 04/22/2010
  • Est. Priority Date: 01/17/2006
  • Status: Active Grant
First Claim
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1. A hydraulic system for driving an auxiliary power source, located aboard a vehicle having a primary power source, at a substantially constant speed despite fluctuations in rotational speed of the primary power source, the system comprising:

  • a hydraulic pump drivably connectable to the primary power source, the pump having an inlet for receiving fluid, an outlet for discharging fluid under pressure, and a pump displacement control inlet for receiving fluid to control displacement of the pump;

    a hydraulic motor drivably connectable to an auxiliary power source, the motor having an inlet for receiving fluid under pressure and an outlet for discharging spent fluid;

    a fluid circuit including a supply conduit for conducting fluid discharged by the pump to the motor, a return conduit for returning fluid discharged by the motor to the pump, and a feedback conduit directly connected to the pump displacement control inlet;

    a control valve assembly interposed between the outlet of the pump and both the inlet of the motor and the feedback conduit, the control valve assembly having a housing including a valve chamber with a valve disposed therein, a solenoid drivably connectable to the valve for selecting moving the valve within the valve chamber between an opened position and a closed position; and

    a control circuit in communication with the control valve assembly for controlling the control valve assembly and hence fluid flow to both of the motor and the pump displacement control inlet.

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