Vol.7, No 1, 2008 pp. 121 - 129
UDC 681.51

ON ERROR-SIGNAL BASED DESIGN OF DIGITAL MINIMUM VARIANCE CONTROL WITH FUZZY-SLIDING MODE
Darko Mitić, Dragan Antić, Marko Milojković
Department of Automatic Control, University of Niš, Faculty of Electronic Engineering, Aleksandra Medvedeva 14, 18000 Nis, Serbia
E-Mail: darko.mitic@elfak.ni.ac.yu, milojkovic@elfak.ni.ac.yu, dantic@elfak.ni.ac.yu

Abstract. This paper deals with a design of input/output based  digital fuzzy sliding mode control concept where no information on a reference input signal is available (only error signal is measurable). The control approach is based on minimum variance control method with disturbance estimator. An additional filtration of nonlinear, fuzzy, control component is performed by using a digital integrator and, consequently, elimination of chattering and higher accuracy in steady-state are achieved in comparison to the existing solution.
Key Words: Fuzzy sliding mode, Minimum variance, Chattering free

PROJEKTOVANJE DIGITALNOG UPRAVLJANJA MINIMALNE VARIJANSE 
S FAZI-KLIZNIM REŽIMOM ZASNOVANO NA SIGNALU GREŠKE
Ovaj rad bavi se digitalnim upravljanjem s fazi-kliznim režimom zasnovanim na modelu ulaz-izlaz gde ne postoji informacija o referentnom ulaznom signalu (može se meriti samo signal greške). Predloženi prilaz u upravljanju bazira se na metodi upravljanja minimalna varijansa sa estimatorom poremećaja. Dodatno filtriranje nelinearne, fazi komponente, izvedeno je korišćenjem digitalnog integratora i, shodno tome, postignuta je eliminacija četeringa i veća preciznost sistema u ustaljenom stanju u odnosu na postojeća rešenja.
Ključne reči: Fazi-klizni režim, Minimalna varijansa, Ublažavanje četeringa