Intelligent Sliding Mode PWM Control the Position of a Pneumatic Rodless Cylinder

• Main Authors: ing-An Ma, 馬明安
• Other Authors: Ming-Chang Shih
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/43653826831769910744

碩士 === 國立成功大學 === 機械工程研究所 === 84 === Because of the high compressibility of air and the system parameters which vary with the temperature, the pressure, the friction force, the leakage of air and disturbance, it is very difficult to obtain a precise mathematical model of pneumatic control system. And it will not obtain good performance if we apply the classic linear controllers such as PID controller, state feedbake controller or other controllers to control the pneumatic system. So nonlinear controllers or intelligent controllers must be applied to attain the purpose of perfect performance. The purpose of this paper is to apply the "fuzzy PWM control law", "sliding mode PWM control law", "neuro-fuzzy PWM control law" and "intelligent sliding mode PWM control law" which combined fuzzy logic control theory, sliding mode control theory, neuro-fuzzy control theory and pulse width modulation (PWM) method to control the position of the rodless pneumatic cylinder. And also using modified differential PWM (M-D-PWM) to improve the hysteresis and the ON/OFF mechanical delay of high speed solenoid valves. The experimental results indicate that these controllers have batter performance and robustness. And the results also confirm the availability of this method. Although the traditional pneumatic control system that applied with servo valve or proportional valve can obtain good performance, yet it is very expensive. The most advantages of the proposed strategy are easy designed, good accuracy, low cost and economic for industrial applications.