US6735483B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling a non-linear mill
Assignee: Rockwell Automation Technologies Inc
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Filing: 2002-12-09
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Granted: 2004-05-11
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Expires: 2022-12-09
Abstract
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
Inventors
- 👤 Gregory D. Martin
- 👤 Eugene Boe
- 👤 Stephen Piche
- 👤 James David Keeler
- 👤 Douglas Timmer
- 👤 Mark Gerules
- 👤 John P. Havener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:14
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/04; G05B13/048; G05B13/042; G05B17/00; G05B17/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
143 words
A method for controlling a non-linear system, comprising the steps of: providing a linear controller having a linear gain k that is operable to receive inputs representing measured variables of the system and predicting on an output of the linear controller predicted control values for manipulatible variables that control the system; providing a non-linear model of the system for storing a representation of the system over a trained region of the operating input space and having a steady-state gain K associated therewith; adjusting the gain k of the linear controller 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; and outputting the predictive manipulatible variables after the step of adjusting the gain k.
Claim 2
Independent Claim
143 words
A method for controlling a non-linear system, comprising the steps of: providing a linear controller having a linear gain k that is operable to receive inputs representing measured variables of the system and predicting on an output of the linear controller predicted control values for manipulatible variables that control the system; providing a non-linear model of the system for storing a representation of the system over a trained region of the operating input space and having a steady-state gain K associated therewith; adjusting the gain k of the linear controller 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; and outputting the predictive manipulatible variables after the step of adjusting the gain k.
Claim 3
Dependent Claim
19 words
The method of claim 1 , wherein the linear controller is operable to model the dynamics of the system.
Claim 4
Dependent Claim
22 words
The method of claim 1 , wherein the dynamics of the system are modeled over a defined region of the input space.
Claim 5
Dependent Claim
41 words
The method of claim 1 , wherein the training region of the operating input space over which the non-linear model is representative of the operation of the system represents a space greater than that over which the linear controller is valid.
Claim 6
Dependent Claim
28 words
The method of claim 1 , and further comprising the step of controlling the operation of the system with the predicted control variables after the step of adjusting.
Claim 7
Dependent Claim
148 words
A controller for controlling a non-linear system, comprising: a linear controller having a linear gain k that is operable to receive inputs representing measured variables of the system and predicting on an output of said linear controller predicted control values for manipulatible variables that control the system; a non-linear model of the system for storing a representation of the system over a trained region of the operating input space and having a steady-state gain K associated therewith; a gain adjustment device for adjusting the gain k of said linear controller with the gain K of said non-linear model in accordance with a predetermined relationship as the measured variables change the operating region of the input space at which said linear controller is predicting the values for the manipulatible variables; and an output for outputting the predictive manipulatible variables after adjustment of the gain k by said adjustment device.
Claim 8
Dependent Claim
148 words
A controller for controlling a non-linear system, comprising: a linear controller having a linear gain k that is operable to receive inputs representing measured variables of the system and predicting on an output of said linear controller predicted control values for manipulatible variables that control the system; a non-linear model of the system for storing a representation of the system over a trained region of the operating input space and having a steady-state gain K associated therewith; a gain adjustment device for adjusting the gain k of said linear controller with the gain K of said non-linear model in accordance with a predetermined relationship as the measured variables change the operating region of the input space at which said linear controller is predicting the values for the manipulatible variables; and an output for outputting the predictive manipulatible variables after adjustment of the gain k by said adjustment device.
Claim 9
Dependent Claim
19 words
The controller of claim 6 , wherein said linear controller is operable to model the dynamics of the system.
Claim 10
Dependent Claim
22 words
The controller of claim 6 , wherein the dynamics of the system are modeled over a defined region of the input space.
Claim 11
Dependent Claim
41 words
The controller of claim 6 , wherein the training region of the operating input space over which said non-linear model is representative of the operation of the system represents a space greater than that over which said linear controller is valid.
Claim 12
Dependent Claim
35 words
The controller of claim 6 , and further comprising a variable control system for controlling the operation of the system with the predicted control variables after adjustment of the gain k by said adjustment device.
Claim 13
Independent Claim
190 words
A method for controlling a non-linear system having an input for receiving manipulatible input variables that control the system and providing a system output, comprising the steps of: providing a linear controller having a linear gain k that is operable to receive inputs representing measured state values of the system and predicting on an output of the linear controller predicted dynamic control values for select ones of the manipulatible input variables that control the system; providing a non-linear model of the system for storing a representation of the system over a trained region of the operating input space and having a steady-state gain K associated therewith; adjusting the gain k of the linear controller 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 dynamic control values for the select ones of the manipulatible variables; outputting the predictive manipulatible input variables after the step of adjusting the gain k as future manipulatible input variables to the system to control the operation thereof at a future time.
Claim 14
Independent Claim
190 words
A method for controlling a non-linear system having an input for receiving manipulatible input variables that control the system and providing a system output, comprising the steps of: providing a linear controller having a linear gain k that is operable to receive inputs representing measured state values of the system and predicting on an output of the linear controller predicted dynamic control values for select ones of the manipulatible input variables that control the system; providing a non-linear model of the system for storing a representation of the system over a trained region of the operating input space and having a steady-state gain K associated therewith; adjusting the gain k of the linear controller 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 dynamic control values for the select ones of the manipulatible variables; outputting the predictive manipulatible input variables after the step of adjusting the gain k as future manipulatible input variables to the system to control the operation thereof at a future time.
Claim 15
Dependent Claim
25 words
The method of claim 11 , and further comprising the step of optimizing the operation of the linear controller in accordance with predetermined optimization constraints.
Claim 16
Dependent Claim
100 words
The method of claim 12 , wherein said non-linear model is operable to receive inputs representing steady state values of select ones of the measured state values of the system and predicting steady state control values for the select ones of the manipulatible variables, wherein the step of outputting comprises outputting a composite control value representing the steady state control value for the select ones of the manipulative value from a steady state control value prior to a move to a steady state control value after the move and a dynamic response there between provided by the dynamic control value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-05-11 | 2007-11-10 | 2008-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-05-11 | 2011-11-10 | 2012-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-05-11 | 2015-11-10 | 2016-05-11 | $7700.00 | Window Closed / Lapsed |