xanthan gum fermentation process;  fuzzy control;  Intelligent PID;  Humanoid intelligent control

The process and characteristics of xanthan gum fermentation process are introduced, and the control of temperature and pH value of fermentation process is discussed. The key points and difficulties of control are the nonlinear and time-varying characteristics of the system. The decision logic unit is used to combine fuzzy control with intelligent PID control to adjust the temperature, and the pH value is controlled by the humanoid intelligent switch control method by analyzing the error curve of the system. The intelligent control method has achieved better control effect.