Apparatus and method for automated closed-loop...

Data processing: generic control systems or specific application – Generic control system – apparatus or process – Optimization or adaptive control

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Reexamination Certificate

active

08046090

ABSTRACT:
An apparatus, method, and computer program are provided for automated closed-loop identification of an industrial process in a process control system. Multiple models (such as multiple model structure-model order combinations) can be identified, where the models are associated with a process to be controlled. One or more metrics (such as a prediction metric or rank) can be determined for each of the models. At least one of the models can be selected based on the one or more metrics. A final model for controlling the process can be provided (such as to a controller), where the final model is based on the at least one selected model. A band pass filter could be designed using some of the identified models. The band pass filter could be used to identify at least one other of the models or to determine at least one of the one or more metrics.

REFERENCES:
patent: 6947876 (2005-09-01), Galarza et al.
patent: 2004/0030667 (2004-02-01), Xu et al.
patent: WO 00/41042 (2000-07-01), None
Van Den Hof et al.; “Indentification and Control—Closed -loop Issues”; 1995; Automtica; vol. 31; No. 12 pp. 1751-1770.
Keith Glover, “All optimal Hankel-norm approximations of linear multivariable systems and their L∞ -error bounds”, International Journal of Control, 1984, vol. 39, No. 6, pp. 1115-1193.
D.E. Rivera, ChE 494/598, EEE 598 Intro to System Identification: Control-Relevant Identification, Apr. 16 and 18, 1998, 18 pages.
Yucai Zhu, “Process in MPC Identification: A Case Study on Totally Closed-Loop Plant Test”, ERTC Computing, Milan , Italy, 11 pages.
Yucai Zhu, Multivariable Process Identification for MPC: The Asymptotic Method and its Applications, pp. 1-23.
Yucai Zhu,“Multivariable and Closed-Loop Identification for Model Predictive Control”, pp. 1-19.
Wallace E. Larimore et al., “Automated System Identification: Basic Principles with Control and Monitoring Applications”, American Control Conference 2004, Jun. 28, 2004, 2 pages.
Urban Forssell et al., “Closed-loop identification revisited”, Automatica 35 (1999), pp. 1215-1241.
Daniel E. Rivera et al., “Experimental Design for Robust Process Control Using Schroeder-Phased Input Signals”, Proceedings of the American Control Conference, San Francisco, California, Jun. 1993, pp. 895-899.
Sujit Gaikwad, “Control-Relevant Identification of Multivariate Systems in Chemical Process Industries”, Sep. 1995, 54 pages.
Elena Grassi et al., “Integrated System Identification and PID Controller Tuning by Frequency Loop-Shaping”, IEEE Transactions on Control Systems Technology, vol. 9, No. 2, Mar. 2001, pp. 285-294.
I. Gustavsson et al., “Survey Paper”, Automatica, vol. 13, 1977, pp. 59-75.
Paul M. J. Van Den Hof et al., “Identification and Control-Closed-loop Issues”, Automatica, vol. 31, No. 12, 1995, pp. 1751-1770.
Lennart Ljung et al., “Subspace identification from closed loop data”, Signal Processing 52 (1996), pp. 209-215.
Brett Ninness et al., “Estimation of Model Quality”, Automatica, vol. 31, No. 12, 1995, pp. 1771-1797.
Kostas Tsakalis et al., “Loop-Shaping Controller Design From Input-Output Data: Application to a Paper Machine Simulator”, IEEE Transactions on Control Systems Technology, vol. 10, No. 1, Jan. 2002, pp. 127-136.
Peter Van Overschee et al., “N4SID: Subspace Algorithms for the Identification of Combined Deterministic-Stochastic Systems”, Automatica, vol. 30, No. 1, 1994, pp. 75-93.
Seungrohk Oh et al., “Nonlinear Output-Feedback Tracking Using High-gain Observer and Variable Structure Control”, Automatica, vol. 33, No. 10, 1997, pp. 1845-1856.
Yucai Zhu, “Multivariable System Identification for Process Control”, 2001, 21 pages.
Wallace E. Larimore et al., “Automated Multivariable System Identification: Basic Principles with Control and Monitoring Applications”, Presented at the Neural Net and Process Control Consortium, Sep. 23, 1999, 67 pages.
Lennart Ljung, “System Identification”, 1987, 31 pages.
Sten Bay Jorgensen et al., “Recent Advances and Challenges in Process Identification”, Proceedings Chemical Process Control VI, Jan. 2002, pp. 55-74.
Robert L. Kosut, “Uncertainty Model Unfalsification: A System Identification Paradigm Compatible with Robust Control Design”, Proceedings of the 34th Conference on Decision & Control, New Orleans, LA, Dec. 1995, pp. 3492-3497.
Wallace E. Larimore, “Canonical Variate Analysis in Identification, Filtering, and Adaptive Control”, Proceedings of the 29th Conference on Decision and Control, Honolulu, Hawaii, Dec. 1990, pp. 596-604.
Lennart Ljung, “Asymptotic Variance Expressions for Identified Black-Box Transfer Function Models”, IEEE Transactions on Automatic Control, vol. AC-30, No. 9, Sep. 1985, pp. 834-844.
Weilu Lin et al., “A Framework for Closed-loop Subspace Identification with Innovation Estimation”, Feb. 9, 2004, 39 pages.
Anders Dahlen at al., “Experimental Evidence Showing That Stochastic Subspace Identification Methods May Fail”, Division of Optimization and Systems Theory, Royal Institute of Technology, Stockholm, Sweden, 1998, 12 pages.
C. T. Chou et al., Abstract of “Subspace Algorithms for the Identification of Multivariable Dynamic Errors-in-Variables Models”, Automatica, Vol. 33, 1997, 2 pages.
Yucai Zhu, Abstract of “Black-box identification of MIMO transfer functions: Asymptotic properties of prediction error models”, Int. J. Adptive Cont. Signal Processing, vol. 3, 1989, 1 page.
Phil Celaya et al., “Closed-Loop Identification at the Hovensa Refinery”, 18 pages.
Dr. Ralph Lien et al., “How Much Can We Increase the Efficiency of MPC Identification?”, 30 pages.
William P. Snow et al., “Increase MPC Project Efficiency by Using a Modern Identification Method”, ERTC Computing, Paris, France, pp. 1-14.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Apparatus and method for automated closed-loop... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for automated closed-loop..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for automated closed-loop... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4274830

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.