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System for controlling valve fluid flow based on rate of change of close rate acceleration

  • US 8,082,066 B2
  • Filed: 11/09/2007
  • Issued: 12/20/2011
  • Est. Priority Date: 02/13/2004
  • Status: Active Grant
First Claim
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1. A computer program product comprising a non-transitory computer readable storage medium storing a set of computer instructions, executable by a computer processor, wherein the set of computer instructions comprise instructions executable to:

  • generate a flow control signal to close a fluid control valve based on a first close rate parameter for a first segment of a close range;

    generate a flow control signal to close the fluid control valve based on a second close rate parameter for a second segment of the close range;

    determine that the fluid control valve has closed;

    generate a suckback control signal configured to cause a suckback valve to push a fluid to an end of a nozzle in response to the determination that the fluid control valve has closed; and

    generate a suckback control signal configured to cause the suckback valve to draw the fluid into the nozzle after the fluid has reached the end of the nozzle;

    wherein the first close rate parameter is a first acceleration factor corresponding to a first rate of change in a close rate acceleration and the second close rate parameter corresponds to a second rate of change in the close rate acceleration.

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