From open-loop learning to closed-loop control

A control problem in practice typically consists of modeling, identification and control design as well as commissioning of the process. This leads to an overall high complexity of the control problem and also high demands on the user. Often adequate expertise is unavailable resulting in that many control problems remain unsolved. In this contribution we will place the user into focus and examine strategies whereby basic engineering knowledge is sufficient to solve control problems. No new methods will be presented, the contribution is in how existing methods are combined into a coherent framework where only basic qualitative process knowledge is required from the user. The contribution can be seen as a step towards a methodology suitable for engineers with limited control background. The ideas will be illustrated on the inverted pendulum.

[1]  Svante Gunnarsson,et al.  Iterative feedback tuning: theory and applications , 1998 .

[2]  S. Gunnarsson,et al.  Optimality and sub-optimality of iterative identification and control design schemes , 1995, Proceedings of 1995 American Control Conference - ACC'95.

[3]  Ola Markusson Model and System Inversion with Applications in Nonlinear System Identification and Control , 2001 .

[4]  Okko H. Bosgra,et al.  Adaptive performance enhancement by iterative identification and control design , 1993 .

[5]  Kevin L. Moore,et al.  Iterative Learning Control: An Expository Overview , 1999 .

[6]  HBkan Hjalmarsson NONLINEAR SYSTEMS USING ITERATIVE FEEDBACK TUNING , 1998 .

[7]  Karl Johan Åström,et al.  Matching Criteria for Control and Identification , 1993 .

[8]  Mikael Norrlöf,et al.  Iterative Learning Control : Analysis, Design, and Experiments , 2000 .

[9]  Michel Gevers,et al.  Towards a Joint Design of Identification and Control , 1993 .

[10]  Håkan Hjalmarsson,et al.  Control of nonlinear systems using iterative feedback tuning , 1998, Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207).

[11]  J. Sjöberg,et al.  On a Nonlinear Controller Tuning Strategy , 1999 .

[12]  Håkan Hjalmarsson,et al.  Control relevant identification of nonlinear systems using linear models , 2001, Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148).

[13]  Katsuhisa Furuta,et al.  Swinging up a pendulum by energy control , 1996, Autom..

[14]  Håkan Hjalmarsson,et al.  USING LOCAL AND GLOBAL INFORMATION IN IDENTIFICATION FOR CONTROL , 2002 .

[15]  Graham C. Goodwin,et al.  Estimation of Model Quality , 1994 .

[16]  Michel Gevers,et al.  Iterative weighted least-squares identification and weighted LQG control design , 1995, Autom..

[17]  Paul M.J. Van den Hof,et al.  Closed-Loop Issues in System Identification , 1997 .