US5400247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive cross-directional decoupling control systems
Assignee: Honeywell Measurex Corp
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Filing: 1992-06-22
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Granted: 1995-03-21
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Expires: 2012-06-22
Abstract
Abstract A method and apparatus for controlling a multiple-input, multiple-output (MIMO) system, such as a sheetmaking system, including identifying a decoupling gain matrix by comparing an actuator control vector against a measured output vector and processing an error vector to update the decoupling gain matrix. The dynamic components of one dynamic mode in the system are separated from that of other dynamic modes such that the input-output characteristic of the process may be treated as independent channels.
Inventors
- 👤 George X. He
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:29
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/04; G05B13/042; D; D21; D21G; D21G9/00; D21G9/0009; G05B11/00; G05B11/01; G05B11/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
159 words
A method of controlling a sheetmaking process using an adaptive decoupling, multiple-input, multiple-output control system, comprising the steps of: applying to the system an actuator control signal; producing a process output signal by measuring an output of the process; identifying a decoupling gain matrix by: a) filtering the actuator control signal by a matrix filter representing uncoupled dynamics of the process to produce a filtered actuator control signal; b) decoupling the process output signal by multiplying it with an adjustable matrix representing inverted coupling of the system to produce a decoupled output signal; and c) adjusting the adjustable matrix so as to minimize a difference between the filtered actuator control signal and the decoupled output signal, thereby producing the decoupling gain matrix; comparing the output signal to a reference signal to produce an error signal for controlling sheet quality of the sheetmaking process; and applying the decoupling gain matrix to the error signal to produce the actuator control signal.
Claim 2
Independent Claim
159 words
A method of controlling a sheetmaking process using an adaptive decoupling, multiple-input, multiple-output control system, comprising the steps of: applying to the system an actuator control signal; producing a process output signal by measuring an output of the process; identifying a decoupling gain matrix by: a) filtering the actuator control signal by a matrix filter representing uncoupled dynamics of the process to produce a filtered actuator control signal; b) decoupling the process output signal by multiplying it with an adjustable matrix representing inverted coupling of the system to produce a decoupled output signal; and c) adjusting the adjustable matrix so as to minimize a difference between the filtered actuator control signal and the decoupled output signal, thereby producing the decoupling gain matrix; comparing the output signal to a reference signal to produce an error signal for controlling sheet quality of the sheetmaking process; and applying the decoupling gain matrix to the error signal to produce the actuator control signal.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein said sheetmaking process is a papermaking process.
Claim 4
Dependent Claim
19 words
A method according to claim 1 wherein the adjustable matrix is continuously adapted during operation of the sheetmaking process.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein the filter matrix representing uncoupled dynamics of the sheetmaking process is a diagonal matrix.
Claim 6
Dependent Claim
23 words
A method according to claim 1 wherein the matrix representing inverted coupled dynamics of the sheetmaking process is reduced to a banded matrix.
Claim 7
Dependent Claim
171 words
An adaptive dccoupling, multiple-input, multiple-output control system for controlling a sheetmaking process, comprising: means for applying to the system an actuator control signal; means for producing a process output signal by measuring an output of the sheetmaking process; means for identifying a decoupling gain matrix, comprising: a) means for filtering the actuator control signal by a matrix filter representing uncoupled dynamics of the sheetmaking process to produce a filtered actuator control signal; b) means for decoupling the process output signal by multiplying it with an adjustable matrix representing inverted coupling of the system to produce a decoupled output signal; and c) means for adjusting the adjustable matrix so as to minimize a difference between the filtered actuator control signal and the decoupled output signal, thereby producing the decoupling gain matrix; means for comparing the output signal to a reference signal to produce an error signal for controlling sheet quality of the sheetmaking process; and means for applying the decoupling gain matrix to the error signal to produce the actuator control signal.
Claim 8
Dependent Claim
171 words
An adaptive dccoupling, multiple-input, multiple-output control system for controlling a sheetmaking process, comprising: means for applying to the system an actuator control signal; means for producing a process output signal by measuring an output of the sheetmaking process; means for identifying a decoupling gain matrix, comprising: a) means for filtering the actuator control signal by a matrix filter representing uncoupled dynamics of the sheetmaking process to produce a filtered actuator control signal; b) means for decoupling the process output signal by multiplying it with an adjustable matrix representing inverted coupling of the system to produce a decoupled output signal; and c) means for adjusting the adjustable matrix so as to minimize a difference between the filtered actuator control signal and the decoupled output signal, thereby producing the decoupling gain matrix; means for comparing the output signal to a reference signal to produce an error signal for controlling sheet quality of the sheetmaking process; and means for applying the decoupling gain matrix to the error signal to produce the actuator control signal.
Claim 9
Dependent Claim
29 words
An apparatus according to claim 6 wherein said adjusting means uses an algorithm selected from the group consisting of a least squares identification algorithm and a gradient search algorithm.
Claim 10
Dependent Claim
20 words
An apparatus according to claim 6 wherein the adjustable matrix is continuously adapted during the operation of the sheetmaking process.
Claim 11
Dependent Claim
20 words
An apparatus according to claim 6 wherein the matrix representing uncoupled dynamics of the sheetmaking process is a diagonal matrix.
Claim 12
Dependent Claim
27 words
An apparatus according to claim 6 wherein the matrix representing inverted coupling of the sheetmaking process is derived from either of a full or a banded matrix.
Claim 13
Dependent Claim
21 words
An apparatus according to claim 6 wherein the matrix representing uncoupled dynamics of the sheetmaking process is a transfer function matrix.
Claim 14
Dependent Claim
20 words
An apparatus according to claim 6 wherein the matrix representing uncoupled dynamics of the process is a transfer function matrix.
Claim 15
Dependent Claim
16 words
An apparatus according to claim 6 wherein said multiple-input, multiple-output sheetmaking process is a papermaking process.
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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) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |