Research On Temperature Control System Of Heat Preservation In Bidirectional Pull Machine

Temperature is a common and one of the most basic process variables in industrial production, scientific research and daily life. Temperature control exists widely in every aspect of social life, and PID is the mainly adopted control algorithm in practice. Due to the environment variation PID parameters in-process tuning is not attainable, which negatively effects control quality.Control theory is ceaselessly updated with the development of science and technology. Fuzzy Control is newly emerging control technology. Fuzzy control needs not the exact mode of equipment but experiences and intuitional judge of the operator. It is easy to be used, fuzzy control is big robust to the parameter of the controlled object and has the strong restrain ability to disturb the system. Based on the analyses of temperature control system both inside and outside, aiming at the characters of the heat preservation of the bidirectional pull machine, this paper presents the whole system's design. PLC is the core, uses fuzzy control in the temperature system, so it can effectively improve the control precision and adapt to the different temperature's requirements.The research object is the heat preservation of the bidirectional pull machine, finish the exploitation and design of the whole temperature control system. By analyzing, the control temperature in the machine is an uncertainty, big inertia, and serious non-linearity object. So the fuzzy control was adapted to realize the control, because it had a thick skin to controlled object's parameters and a less exceed amplitude modulation than PID.This paper shows a strong coupling and multiple variable temperature control system, it's input variables are center temperature and average one, and the output variables are heating components and hot wind's velocity, these form a double input-double output temperature control system. Based on these, fuzzy control method that can decoupling is used, divided control arithmetic is given. The control arithmetic steps are introduced. It is a practical plan and reaches the temperature control quality.