The use of Fuzzy-PID in the control system of making in-glaze color in bone China roller kiln

By controlling the electrothermal roller kiln in burning bone china process, this system will control the temperature in making in-glaze color. It adopts Fuzzy-PID control algorithm, and applies Simulink to do system modeling. After analyzing the property indexes of the simulated control system, the feasibility and rationality of using Fuzzy-PID in the control system of making in-glaze color in bone china roller kiln will be proved. This system mainly uses AT89C52 single-chip microcomputer made by ATMEL company. The K-type thermocouple collects the temperature signals from the kiln first, then after these signals having been adjusted and amplified, they will be changed into digital signals by AD574, and then into the corresponding temperature value set by AT89C52 single-chip microcomputer. Adopt Fuzzy-PID to get the corresponding control variables, then change into 0~5V analog voltage signals by DAC0832. At last, By controlling the voltage of the thyristor output circuit, the stable control of the temperature in the producing process in the electricity - heating roller kiln is realized. This control system has been applied to the 30-meter electricity-heating glazefiring roller kiln in HeXin Ceramic Factory of LuBei District of Tangshan, which increases the qualification rate of the in-glaze color china from 82% to 98%.