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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]

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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

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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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