Improved variable universe fuzzy PID application in beer fermentation process

Beer fermentation process has the characteristics of nonlinear, time varying and pure lag. Since tradition PID control and fuzzy PID control are difficult to satisfy the control requirements, an improved variable universe fuzzy PID control method is proposed. The variable universe fuzzy controller is improved bv adapting scale partition method. PID control, fuzzy PID control and improved variable universe fuzzy PID control methods are analyzed and compared by using Matlab program. The results show that the improved universe fuzzy PID control method has better dynamic and static performance with adaptive capability.