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Pump control system

  • US 4,850,805 A
  • Filed: 03/13/1987
  • Issued: 07/25/1989
  • Est. Priority Date: 03/13/1987
  • Status: Expired due to Term
First Claim
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1. In a liquid pumping system, including a pump chamber which may exhibit compliance and which is operable in a filling cycle and in a pumping cycle, apparatus comprising:

  • means for measuring the pressure within said chamber during filling and during pumping; and

    means for determining the portion of a cycle over which the pressure within said chamber is undergoing a transition between a substantially constant pumping pressure and a substantially constant filling pressure;

    wherein the ratio of said portion to said total cycle indicates the compliance of said chamber.

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