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Flow signal filter

  • US 5,966,674 A
  • Filed: 04/09/1997
  • Issued: 10/12/1999
  • Est. Priority Date: 04/09/1997
  • Status: Expired due to Term
First Claim
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1. A method of providing a filtered signal indicative of a flow of fluid to a fluid pressure communication conduit, said flow dependent upon a pressure of fluid in a chamber, said pressure of fluid in said chamber controlled by at least one pressure adjusting valve, said method comprising:

  • (a) receiving into a data processing module at least one first signal indicative of an open state for at least one of said at least one pressure adjustment valve;

    (b) receiving into said data processing module a second signal indicative of a value of a real instantaneous flowrate for said flow of fluid to said fluid pressure communication conduit;

    (c) choosing between a first processing mode and a second processing mode for said second signal, said first processing mode during times when said second processing mode is not in effect, and when said at least one first signal does not indicate an open valve, said second processing mode activated when at least one of said at least one first signal indicates an open valve, said second processing mode, when activated, proceeding according to a predetermined procedure and then returning to said first processing mode when said at least one first signal indicates an open valve;

    (d) said data processing module processing said second signal by said first processing mode and said second processing mode, as chosen in step (c), and providing said filtered signal indicative of said flow of said fluid as an output signal to equipment external to said data processing module.

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