Ie Water Heater Fuzzy Temperature Controller Developed

The fuzzy control theory is an important branch in engineering applications of fuzzy mathematics. Its basic thought is using computer to realize people's control experience. It is the result of the fuzzy theory combined with computer technology and automatic technology. And it is widely used because of its good control characteristics.This text uses single-chip microcomputer AT89S52 of ATMEL as the key part and have programmed system soft ware with intelligence compensation using the method of the fuzzy control theory combined together with field debug, thus overcomes the disadvantages of waste of time and energy existed in PID control method, caused by the long necessary time to reach constant temperature state, low control precision, difficulty to grasp the setting methods of PID parameters etc., which make systematic working efficiency low and can't meet the demand. Practical running indicates that the temperature control system of electric heater designed using this system control technology is steady and reliable, with high control precision and short transition time.This text introduces firstly the overall composition of the system, and then describes its two parts of hardware and software. The interactions between whole structure and every module are described in the hardware. For the newer programmable chips, their internal structures and external characteristics are introduced further. The part of software explains PID control algorithm and fuzzy control theory separately and illustrates the application of fuzzy control in this system. The procedure flow is provided to show the realization of fuzzy control in this system. Finally the summary of this system is given.The software adopts modular design. Several separate sub-modules are divided under the main program module. And software traps are set up in the proper position of every module to carry out redundant design. In the signal collecting and processing procedure many kinds of digital filter methods are adopted in order to get rid of the interfere of random sharp pulses.This system can realize the real-time control of the temperature of the water heater, with strong portability of the procedure. It is worthy of popularization and application and its performance reaches the domestic similar equipment level at present, with low cost.