Design of Networked TS Fuzzy Controller with Packet Loss Ratio Consideration

• Main Authors: Kun-Lin Hsieh, 謝坤霖
• Other Authors: 曾傳蘆
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/9jsd87

碩士 === 國立臺北科技大學 === 電機工程系所 === 96 === With the highly development of the Internet network techniques, using Internet to carrying out remote control is getting popular. Due to the properties of data-transmission delay and packet loss, the performance of classic controllers, which were designed by control theory, may be unable to meet the system requirements. In order to solve the problem, this thesis proposes an improved TS Fuzzy PID controller which is suitable for the network control systems (NCS). This controller is composed of several PID controllers and the TS fuzzy inference. First, the universe of discourse of the membership functions is determined by the average and standard deviation of the round trip time (RTT). The input and output scaling factors of the improved TS Fuzzy PID controller are dynamically regulated by fuzzy reasoning. In control operations, by taking the actual measurement of RTT and packet loss ratio as input, the mechanism of the improved TS fuzzy inference engine and defuzzifier are used to conduct proper control signals. Since the control actions are manipulated according to the network status, the output response of the system is improved. Finally, a networked motor control system is implemented by using the BCB software. To verify the performance of the proposed controller, several experiments are taken via hardwire and wireless networks with different protocols. Experimental results demonstrate that the improved TS Fuzzy PID controller outperforms the conventional PID controllers, especially in the case of high packet loss rate and large network delay fluctuation.