| Heat treatment is a main means of improving metal material and metalwork. In recent yeas, with the development of industry, there are more and more supernal request for metalwork, so heat treatment is hammering at high quality and efficient, low-power and zero-social effects of pollution. Resistance furnace is a used broadest heating equipment in heat treatment, and measurement and control of temperature in heating is becoming pivotal technic. These urge people study methods of controlling heating process.Resistance furnace has pure lag and larger inertia. There are many factors which affect controlling process, such as opening and closing furnace door, heated metal material, surrounding temperature and wire power. In tradition, heating furnace controlling system is most based on some model, which can't achieve heating process request. So this paper try in draught fuzzy controlling arithmetic into traditional heating furnace controlling system to form brainpower fuzzy control system. It makes using of fuzzy control rule to self-tuning PID parameters on line, and improving its control effect.This paper designs the tow orders TDC to control resistances base of Fuzzy self-tuning PID controlling arithmetic. DDC has 8031 SCM as the principal part and is an intelligent controller that can work intricater data processing and intricate control function. It not only is a member of TDC working with computer but also is a self-governed SCM control, and has more flexible and security. SCM gives out pulse signal to spring circuit then driving triode AC and heating furnace after works out the control value through input orders. SCC is empoldered in Windows98 and can watch several DDC.Fuzzy self-tuning PID control this paper bring forwards has veriest intelligent and flexible, which has auto-measurement, gathering and dealing with real time data and show control result, etc. It has high control precision and directive meaning for processing quality heating metalwork. |
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