Multi-mode control algorithm
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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Abstract
A system and method for controlling a flow of a fluid using a multi-mode control algorithm is described. One embodiment includes a method for changing the multi-mode control algorithm from a closed-loop mode to an open-loop mode. The method includes receiving at least one sensor indicator generated by a sensor. The multi-mode control algorithm is modified from the closed-loop mode to the open-loop mode when, based on the at least one sensor indicator, the threshold condition is satisfied. The multi-mode control algorithm is used by a flow controller to control a flow of a fluid according to a set point.
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Citations
25 Claims
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1. A method, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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receiving at least one sensor indicator generated by a fluid flow characteristic sensor; modifying a multi-mode control algorithm from a closed-loop mode to an open-loop mode when, based on the at least one sensor indicator, a threshold condition is satisfied, the multi-mode control algorithm is used by a flow controller to control a flow of a fluid according to a set point; initiating a timer when the threshold condition is satisfied; calculating a valve position of a valve so as to deliver the fluid according to the set point when operating in the open-loop mode; and modifying the multi-mode control algorithm from the open-loop mode to the closed loop mode when a time period of the timer expires. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus, comprising:
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a processor configured to calculate a valve position based on a pressure measurement when a feedback control loop has been disengaged, the feedback control loop being disengaged when a pressure change of a fluid satisfies a threshold condition, a valve controls a flow of the fluid in response to the valve position, and the processor is configured to re-engage the feedback control loop when a time period after the threshold condition was satisfied expires; and a memory configured to store a mathematical relationship between the valve position, the flow of the fluid, and the pressure measurement, the mathematical relationship is used by the processor to calculate the valve position. - View Dependent Claims (23, 24, 25)
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Specification