The Research On Fuzzy Control Method And Application Based On Single-Chip Microcomputer

Fuzzy Control is an important branch of Intelligent Control. It is a kind of control method based on rules, directly adopting language control rules according to the control experiences of local operators or knowledge from experts of this field.In the complicated industry controlled process, the controlled objects usually own the time delay, nonlinear, time-variant characteristic and exist the category of interferences. So, if the traditional PID control method is only used, the static and dynamic output capability is not very satisfying. The essence of fuzzy control could be good at controlling those complicated, nonlinear systems with the characteristic of the parameter drift, the inaccurate model and time delay because the essence of fuzzy control is nonlinear control and adaptive control. Fuzzy control makes the systems more stable and more robust.Starting with the basic theory of fuzzy control, the paper analyses and comparatively studies the design methods of fuzzy controller and the realization methods of fuzzy control, on the basis of which, a fuzzy control system based on AT89S51 integrated solar water heater is established. A 4 input-2 output fuzzy controller has been designed in this paper, whose fuzzy control rules can imitate the experience of person effectively. Then a concise and convenient fuzzy control lookup table is obtained off-line through fuzzy logic inference combined with complex mathematic computation. Finally the paper presents the realization method of software fuzzy control lookup and the hardware circuit and software flow chart of the main control part of the fuzzy control system. In addition, putting the simulation software into use in the process of the Fuzzy Control, it is benefit to improving the reliability of the products and reducing the time of the products design..