IMPROVING THE CONTROL QUALITY OF VALVE - LEVEL TANK SYSTEM BASED ON FUZZY PID CONTROL

Abstract

Control valve - level tank system is an important and popular controlled object in the process control system. This paper presents the design of a new fuzzy logic PID hybrid controller to control valve - level tank system when it has parameter changes for the purpose of the system response of always following standard trajectory. PID controller is developed by first describing the continous-time linear PID control law. When system parameters change: dead band control valve increases; there appear flow noise and loading interference...Therefore, PID hybrid fuzzy controller is designed to compensate for the PID parameters. The simulation results in Matlab - Simulink show that the new PID controller with offset dim improves control quality and responds better than the traditional PID controller.