Application of Fuzzy-PID Control in Cut Stem Fluidized Bed

The major problem existing in cut stem fluidized drying system was the wide moisture content fluctuation of output cut stem,PLC-based fuzzy-PID control and two-dimensional fuzzy controller were designed via analyzing the causes of over-dried and under-dried cut stem.The results indicated that the dynamic performance indexes of the system were significantly improved by fuzzy-PID control,the effect of temperature lag on the control system was restrained,the stability of the system and the quality of cut stem were improved.The amount of overdried and under-dried cut stem per batch decreased obviously,and the monthly qualified rate of cut stem increased from 60.3% to 92.0% and above.