KILN THERMAL AND COMBUSTION CONTROL
First Claim
1. A method for controlling a nonlinear system, comprising:
- a linear controller receiving inputs representing measured variables of the system, wherein values of the measured variables of the system are in a first operating region, and wherein the linear controller is operable to determine predicted control values for manipulable variables that control the system;
executing a nonlinear model of the system, wherein the nonlinear model has been trained to represent operation of the system over a specified region of the system'"'"'s operating space;
initiating a change in operation of the system, wherein the change operates to move the values of the measured variables of the system from the first operating region to a second operation region, wherein said initiating comprises modifying the nonlinear model in accordance with the change in operation of the system;
adjusting one or more parameters of the linear controller based on an associated one or more parameters of the nonlinear model as the values of the measured variables move;
further modifying the one or more parameters of the linear controller in a specified manner as the values of the measured variables move from the first operating region to the second operating region;
the linear controller determining predicted control values for the manipulable variables in response to said further modifying; and
outputting the predicted control values for the manipulable variables, wherein the predicted control values are useable to control the system.
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Accused Products
Abstract
A method and apparatus for controlling a non-linear mill. A linear controller is provided having a linear gain k that is operable to receive inputs representing measured variables of the plant and predict on an output of the linear controller predicted control values for manipulatible variables that control the plant. A non-linear model of the plant is provided for storing a representation of the plant over a trained region of the operating input space and having a steady-state gain K associated therewith. The gain k of the linear model is adjusted with the gain K of the non-linear model in accordance with a predetermined relationship as the measured variables change the operating region of the input space at which the linear controller is predicting the values for the manipulatible variables. The predicted manipulatible variables are then output after the step of adjusting the gain k.
48 Citations
20 Claims
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1. A method for controlling a nonlinear system, comprising:
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a linear controller receiving inputs representing measured variables of the system, wherein values of the measured variables of the system are in a first operating region, and wherein the linear controller is operable to determine predicted control values for manipulable variables that control the system;
executing a nonlinear model of the system, wherein the nonlinear model has been trained to represent operation of the system over a specified region of the system'"'"'s operating space;
initiating a change in operation of the system, wherein the change operates to move the values of the measured variables of the system from the first operating region to a second operation region, wherein said initiating comprises modifying the nonlinear model in accordance with the change in operation of the system;
adjusting one or more parameters of the linear controller based on an associated one or more parameters of the nonlinear model as the values of the measured variables move;
further modifying the one or more parameters of the linear controller in a specified manner as the values of the measured variables move from the first operating region to the second operating region;
the linear controller determining predicted control values for the manipulable variables in response to said further modifying; and
outputting the predicted control values for the manipulable variables, wherein the predicted control values are useable to control the system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for operating a nonlinear system, the system comprising:
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a linear controller, operable to;
receive inputs representing measured variables of the nonlinear system, wherein the measured variables of the nonlinear system are in a first operating region; and
determine predicted control values for manipulable variables that control the nonlinear system;
a nonlinear model of the nonlinear system, wherein the nonlinear model has been trained to represent operation of the nonlinear system over a specified region of the nonlinear system'"'"'s operating space;
means for initiating a change in operation of the nonlinear system, wherein the change operates to move the measured variables of the nonlinear system from the first operating region to a second operation region;
means for modifying the nonlinear model in accordance with the change in operation of the nonlinear system;
means for adjusting one or more parameters of the linear controller based on an associated one or more parameters of the nonlinear model as the measured variables move;
means for further modifying the one or more parameters of the linear controller in a specified manner as the measured variables move from the first operating region to the second operating region;
wherein the linear controller is further operable to determine predicted control values for the manipulable variables in response to said further modifying; and
means for outputting the predicted control values for the manipulable variables, wherein the predicted control values are useable to control the nonlinear system. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification