The Electric Box-type Heating Furnace Control System Based On Fuzzy PID

With the development of industry, electric heating furnace is more and more widely used. Temperature is an important parameter of electric heating furnace, and the demand of temperature control is increasing. The traditional control method usually base on a precise mathematical model, nevertheless, for the electric heating furnace control system with the characteristic of non-linear, pure time-delay, large inertia, time-variation and unidirectional rising, it is difficult to establish a precise mathematical model.It will appear steady-state error due to the complex algorithm and imperfect theory of fuzzy control. Traditional PID control can mostly meet the control demand for its maturity and easy comply, but its efficiency relies on its parameter-tuning. And because of the conflict between quickness and the small temperature over setting point, it probably can't meet the control demand. In this paper, fuzzy control and traditional PID control are combined, and fuzzy control rules are established basing on manual experience. The new method can tune the PID parameters on line, and it can improve the control efficiency.This paper proposes a method of electric heating furnace control system basing on fuzzy PID control. Firstly, it presents the design of fuzzy PID controller. And then the comparison of the efficiency between fuzzy PID and traditional PID is made according to the result of simulation. Analysis about feasibility of using fuzzy PID control in electric heating furnace control system is also made. At last, traditional PID control method and fuzzy PID control method were debugged in electric heating furnace control system. The result shows that the fuzzy PID control method is superior to traditional PID control method.