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Time Delayed and Quantized Fussy Systems : Stability Analysis and Controller Design

Chang Woo Park/Hyng Jin Kang/ Jung Hwan Kim/ Mignon Park
Transaction on Control Automation, and Systems Engineering, vol. 2, no. 4, pp.274-284, 2000

Abstract : In this paper, the design methodology of digital fuzzy controller(DFC) for the systems with time-delay is presented and the qualitative effects of the quantizers in the digital implementation of a fuzzy controllers are investigated. We propose the fuzzy feedback controller whose output is delayed with unit sampling period and predicted. The analysis and the design problem considering time-delay become very easy because the proposed controller is syncronized with the sampling time. The stabilization problem of the digital fuzzy system with time-delay is solved by linear matrix inequality(LMI) theory. Furthermore, we analyze the stability of the quantized fuzzy system. Our results prove that when quantization is taken into account, one only has convergence to some small neighborhood about origin. We develop a fuzzy control system for backing up a computer-simulated truck-trailer with the consideration of time-delay and quantization effect. By using the proposed method, we analyze the quantization effect to the system and design a DFC which guarantees the stability of the control system in the presence of time-delay.

Keyword : time-delay, quantization, linear matrix inequality, digital fuzzy control

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