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Controller for a variable displacement feed pump

  • US 7,802,971 B2
  • Filed: 09/02/2007
  • Issued: 09/28/2010
  • Est. Priority Date: 08/21/2006
  • Status: Active Grant
First Claim
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1. A variable delivery feed pump for hydraulic media, comprising an input and an output, at the output a feed pressure (P1) being present, a pressure-reducing element that is connected to the output, at an output of the pressure-reducing element the system pressure (P2) being present and the output of the pressure-reducing element being connected to a consumer, wherein the output of the variable delivery pump is connected to a first input of a pump controller, and a second input of the pump controller is connected to the output of the pressure-reducing element, and wherein the pump controller adjusts the feed pump toward maximum delivery if the system pressure (P2) is smaller than a minimum pressure or if the system pressure (P2) is smaller than the pressure present at the first input, and wherein parallel to the pump controller a pressure limiter is switched such that at a first input thereof the pressure present at the first input of the pump controller is present and that at a control input the system pressure (P2) is present, the pressure limiter opening if the system pressure (P2) is greater than a desired value.

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