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Fluid flow control system

  • US 4,277,832 A
  • Filed: 10/01/1979
  • Issued: 07/07/1981
  • Est. Priority Date: 10/01/1979
  • Status: Expired due to Term
First Claim
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1. A fluid flow control system, comprising:

  • (A) a fluid control valve, the flow of fluid through said valve varying as a function of the position of said valve;

    (B) valve adjust means for adjusting the position of said control valve as a function of a valve position signal; and

    (C) control means for generating a new said valve position signal during each of a plurality of sampling intervals N, said control means generating said valve position signal by;

    (1) computing, during each successive sampling interval N, the rate of flow of fluid through said valve as a function of the position of said valve and in accordance with the static flow equation for said valve; and

    (2) generating said new valve position signal as a function of the difference between a desired flow and said computed flow and in accordance with a non-linear control transfer function which limits said valve position signal, and therefore limits the change in position of said valve between the present sampling interval N and the following sampling interval N+1, to a value which ensures that the actual flow of fluid through said valve during said following sampling interval N+1 is substantially equal to the flow predicted by said static flow equation.

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