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US007123973B2
(12) United States Patent ao) Patent No.: Us 7,123,973 B2
Rutherford (45) Date of Patent: Oct. 17,2006
Page 2
(54) PARTITIONED CONTROL SYSTEM AND METHOD
(76) Inventor: Mark L. Rutherford, 2112 Fairfax Ave., Apartment 116, Nashville, TN (US) 37212
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 11/214,700
(22) Filed: Aug. 30, 2005
(65) Prior Publication Data
US 2005/0288801 Al Dec. 29, 2005
Related U.S. Application Data
(62) Division of application No. 10/789,221, filed on Feb. 27, 2004, now Pat. No. 6,959,218, which is a division of application No. 09/531,057, filed on Mar. 20, 2000, now Pat. No. 6,721,608.
(51) Int. CI.
G0SB 13/02 (2006.01) G0SB 11/01 (2006.01)
(52) U.S. CI 700/53; 700/20; 700/28;
700/29; 700/37; 700/45; 700/54
(58) Field of Classification Search 700/8,
700/20, 28-29, 37, 44^15, 53-54 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
![[table]](http://www.google.fr/patents?id=Dx97AAAAEBAJ&hl=fr&ie=ISO-8859-1&output=text&pg=PA1&img=1&zoom=3&hl=fr&q=&cds=1&sig=ACfU3U1Kp2JriKgV3SEL6w1vuQw0Gna0bg&edge=0&edge=stretch&ci=135,777,283,102)
5,379,210 A * 1/1995 Grajic et al 700/28
5,394,322 A 2/1995 Hansen
5,455,763 A 10/1995 Feingold
5,481,453 A 1/1996 Desantis
5,561,599 A 10/1996 Lu
5,609,136 A * 3/1997 Tuken 123/357
5,777,872 A * 7/1998 He 700/29
5,791,160 A 8/1998 Mandler et al.
5,892,679 A * 4/1999 He 700/29
5,901,059 A * 5/1999 Tao et al 700/29
6,162,488 A 12/2000 Gevelber et al.
6,185,468 Bl* 2/2001 Wells 700/30
6,546,295 Bl 4/2003 Pyotsia et al.
6,658,304 Bl * 12/2003 Molander et al 700/45
6,697,767 Bl * 2/2004 Wang et al 702/189
OTHER PUBLICATIONS
Debelak, Kenneth A. et al., Partitioned Error Control. Ind. Eng. Chem. Res. 38: 4113-4119 (1999).
(Continued)
Primary Examiner—Anthony Knight Assistant Examiner—Ronald D Hartman, Jr. (74) Attorney, Agent, or Firm—Jones Day
(57) ABSTRACT
A method for controlling a controlled process in response to an input signal and a disturbance signal includes modeling the controlled process in a process model; controlling the process model by a first controller; isolating the first controller from the disturbance signal so that the first controller may be designed for an optimal response to the input signal; driving the first controller by a first drive signal proportional to the difference between the input signal and a process model output signal; isolating a second controller from the input signal so that the second controller may be designed for an optimal response to the disturbance signal; and driving the second controller by a second drive signal proportional to difference between a process output signal and the process model output signal.
6 Claims, 2 Drawing Sheets
![[graphic]](http://www.google.fr/patents?id=Dx97AAAAEBAJ&hl=fr&ie=ISO-8859-1&output=text&pg=PA1&img=1&zoom=3&hl=fr&q=&cds=1&sig=ACfU3U1Kp2JriKgV3SEL6w1vuQw0Gna0bg&edge=0&edge=stretch&ci=214,878,554,315)
OTHER PUBLICATIONS
Lundstrom, Peter et al., Two-Degree-of-Freedom Controller Design for an Ill-Conditioned Distillation Process Using u-Synfhesis. IEEE Transactions on Control Systems Technology, 7: No. 1, 12-21 (1999).
Limebeer, D.J. N. et al. On the Design of Robust Two Degree of Freedom Controllers. Automatica 29: No. 1, 157-168 (1993). van Diggelen, F. et al. A Hadamard Weighted Loop Shaping Design Procedure. Proceedings of the 31st IEEE Conference on Decision and Control. 2: 2193-2198 (1992).
Skogestad, Sigurd et al. Robust Control of Ill-Conditioned Plants: High-Purity Distillation. IEEE Lransactions on Automatic Control 33 No. 12, 1092-1105 (1988).
Lopez, A.M., Tuning Controllers With Error-Integral Criteria. Instrumentation Technology 57-62 (1967).
Rovira, Alberto A., Tuning Controllers for Setpoint Changes. Instru- ments & Control Systems 42: 67-69 (1969). Tyreus, Bjorn D., et al. Tuning PI Controllers for Integrator/Dead Time Processes. Ind. Eng. Chem. Res. 31: 2625-2628 (1992).
Murrill, Paul W., The Controller; The Adjustement of Controllers; Controllers and Degrees of Freedom. Automatic Control of Pro- cesses. International Textbook Company, Scranton, Pennsylvania Ch. 16, 17, 18 319-385 (1967).
Skogestad, Sigurd et al. Classical Feedback Control. Multivariable Feedback Control Analysis and Design, John Wiley & Sons Ltd., West Sussex P019 1US, England Ch. 2 15-62 (1996). Astrom, Karl J. et al. Disturbance Models; Design: An Overview; Adaptive Control. Computer Controlled Systems Theory and Design, Prentice-Hall, Inc., Englewood Cliffs, NJ Ch. 6, 7, 14 121-173; 343-360 (1984).
Morari, Manfred et al. Fundamentals of SISO Feedback Control. Robust Process Control, Prentice Hall, Inc., Englewood Cliffs, NJ Ch 2 11-38 (1989).
Horowitz, Isaac M. Design of Feedback Control Systems for Independent Control of Transmission and Sensitivity Functions. Synthesis of Feedback Systems, Academic Press New York and London Ch. 6 246-298 (1963).
* cited by examiner
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