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Differential pressure control

  • US 8,453,783 B2
  • Filed: 06/18/2007
  • Issued: 06/04/2013
  • Est. Priority Date: 06/18/2007
  • Status: Active Grant
First Claim
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1. A load sensing hydraulic control system for use with a vehicle including a frame, a plurality of traction devices configured to propel the frame on the ground, a plurality of hydraulic actuators, a variable displacement pump including a pump displacement controller receiving a pump control signal, the variable displacement pump being in fluid communication with the plurality of hydraulic actuators through a discharge passage, and a load sense system providing a maximum pressure signal indicative of the maximum pressure needed by the plurality of hydraulic actuators during operation of the vehicle, the load sensing hydraulic control system comprising:

  • an orifice receiving the maximum pressure signal, the orifice being in fluid communication with the pump displacement controller,a check valve receiving the maximum pressure signal and bypassing the orifice when the maximum pressure signal is greater than the pump control signal, anda load sense regulator in fluid communication with the pump displacement controller, the load sense regulator maintaining a pressure differential over the orifice below a predetermined level.

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