US6937908B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for tuning PID controllers applicable to nonlinear systems
Assignee: Korea Advanced Institute of Science and Technology
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Filing: 2003-10-29
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Granted: 2005-08-30
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Expires: 2023-10-29
Abstract
Abstract A method for tuning a PID controller includes the steps of inducing equivalent relationships between PID gains of the PID controller and parameters of time delay control (TDC), selecting a natural frequency vector and a damping ratio vector so as to acquire a desired error dynamics of the closed PID control loop system, selecting a sampling time of the closed PID control loop system, determining the parameters of TDC on the basis of the natural frequency vector, the damping ratio vector and a closed loop stability condition for TDC, and selecting PID gains of the PID controller on the basis of the equivalent relationships.
Inventors
- 👤 Pyung Hun Chang
- 👤 Je Hyung Jung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:17
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/36; G05B11/42; G05D; G05D13/00; G05D13/34; G05D13/60; G05B13/00; G05B13/02; G05B13/0205; G05B13/024
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
A method for tuning a PID controller, wherein the PID controller is comprised in a closed PID control loop system, the PID control loop receiving an input, the PID controller being coupled to an object system being controlled, wherein the object system outputs process variables which is supplied for comparison to the input, wherein a result of said comparison is supplied to the PID controller, the method comprising the steps of: inducing equivalent relationships between PID gains of the PID controller and parameters of time delay control (TDC); selecting a natural frequency vector and a damping ratio vector so as to acquire a desired error dynamics of the closed PID control loop system; selecting a sampling time of the closed PID control loop system; determining the parameters of TDC on the basis of the natural frequency vector, the damping ratio vector and a closed loop stability condition for TDC; and selecting PID gains of the PID controller on the basis of the equivalent relationships.
Claim 2
Independent Claim
164 words
A method for tuning a PID controller, wherein the PID controller is comprised in a closed PID control loop system, the PID control loop receiving an input, the PID controller being coupled to an object system being controlled, wherein the object system outputs process variables which is supplied for comparison to the input, wherein a result of said comparison is supplied to the PID controller, the method comprising the steps of: inducing equivalent relationships between PID gains of the PID controller and parameters of time delay control (TDC); selecting a natural frequency vector and a damping ratio vector so as to acquire a desired error dynamics of the closed PID control loop system; selecting a sampling time of the closed PID control loop system; determining the parameters of TDC on the basis of the natural frequency vector, the damping ratio vector and a closed loop stability condition for TDC; and selecting PID gains of the PID controller on the basis of the equivalent relationships.
Claim 3
Dependent Claim
30 words
The method as defined in claim 1 , wherein the object system being a multi input multi output system of degree n which is expressed in a sampled data system.
Claim 4
Dependent Claim
52 words
The method as defined in claim 2 , wherein the number of the parameters of TDC is three, a first parameter being determined by the natural frequency vector, a second parameter being determined by the natural frequency vector and damping ratio vector and a third parameter being determined as a diagonal matrix.
Claim 5
Dependent Claim
21 words
The method as defined in claim 3 , wherein all of diagonal elements of the third parameter has one constant value.
Claim 6
Dependent Claim
22 words
The method as defined in claim 3 , wherein diagonal elements of the third parameter have constant values different to each other.
References Cited (Backward Citations)
US4466054A
Cited
US4539633A
Cited
US4754391A
Cited
US5057993A
Cited
US5331541A
Cited
US5229699A
Cited
US5568377A
Cited
US6330484B1
Cited
US5587899A
Cited
US5742503A
Cited
US5971579A
Cited
US5847952A
Cited
US5818714A
Cited
US6081751A
Cited
US6510351B1
Cited
US6847954B1
Cited
US6697767B2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2008-08-29 | 2009-02-28 | 2009-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-08-29 | 2013-02-28 | 2013-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-08-29 | 2017-02-28 | 2017-08-30 | $7700.00 | Window Closed / Lapsed |