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Multi-mode control algorithm

  • US 7,640,078 B2
  • Filed: 07/05/2006
  • Issued: 12/29/2009
  • Est. Priority Date: 07/05/2006
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving a pressure measurement of a fluid generated by a pressure sensor;

    disengaging a feedback control loop responsive to a pressure change rate of the fluid satisfying a threshold condition;

    initiating a timer when the feedback control loop is disengaged;

    calculating a valve position to produce a fluid flow according to a specified fluid flow set point, the calculation of the valve position being based on the pressure measurement, and the calculated valve position being used to control a flow of the fluid while the feedback control loop is disengaged; and

    re-engaging the feedback control loop when a time period of the timer expires, the time period is defined based on the pressure change rate.

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