THE IDENTIFICATION OF THE OPERATING REGIMES OF THE CONTROLLERS BY THE HELP OF THE PHASE TRAJECTORY
Keywords:
fuzzy interpolative controllers, adaptive control, phase trajectory, heuristic control rules.Abstract
The paper presents an on-line identification method of the operating regimes of the closed loop con-trollers. This method uses as main tool the phase trajectory of the control error, which is analysed in a qualitative manner. The operating domain is divided into four regimes: variable, steady, oscillating and unstable. This operation may be performed by fuzzy or by interpolative controllers, on the base of general knowledge on the PID controllers adjustment. A high quality self-adaptation of the controllers may thus be obtained, covering all the possible operation regimes.References
Bălaş M., The temperature control by variable structure interpolative PID controllers. Proceedings of the 6th International Conference on Engineering of Modern Electric Systems. University of Oradea, May, 2001.
Bălaş M., Bălaş V., Foulloy L., Galichet S., A model of the sliding wheel during braking. Proceedings of the 5th International Conference on Railway Bogies and Running Gears BOGIE'01, Budapest, Sept., 2001.
Bălaş M., Regulatoare fuzzy interpolative, Politehnica Timi-şoara, 2002.
Dragomir T.L., Interpolative Controllers – a Correctional and Improvement Alternative for Design and Implementation. Proceedings of the 6th International Conference on Engi-neering of Modern Electric Systems EMES'01, Oradea, May, 2001.
Dragomir T.L., Dale S., Bălaş M., Some aspects regarding interpolative control. The 13th International Conference on Control Systems, CSCS13, Bucureşti, Nov. 2001.
Foulloy L., Qualitative Control and Fuzzy Control: Towards a Writing Methodology, AICOM Vol. 6, Nrs. 3/4 Sept./Dec., pag. 147-154, 1993.
Stoll K.E., Ralston P.A.S., Ward T.L., Linguistic Design of Nonlinear Controllers. Journal of Intelligent and Fuzzy Systems, vol. 4, nr.1, 19-32, 1996.
M. BălaÅŸ, V. BălaÅŸ, T.L. Dragomir, „A Preamble on the Identification of the Operating Regimes of the Controllers by the Help of the Phase Trajectoryâ€, Electronic BUSEFAL nr. 87, June 2002, http://www.univ-savoie.fr/ Portail/ Groupes/ LISTIC/ busefal/ Papers/ 87.zip/ 87_01
