| The extruder is the key equipment of the wire and cable industry. Nowadays wire and cable factories mostly adopt the automation control system based on PLC. On one hand, because the modeling of the controlled object is complex, there are quite a few input and output variables, and the relationship between output variables is close, there is a outstanding problem that the degree of automation is not high in the control system based on PLC. On the other hand, the control system based on PLC adopts analog and switch quantity control, which leads to low precision and bad reliability of the system.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 by SCM, on the basis of which, a fuzzy control system of extruder based on MOTOROLA MC68HC05B6 SCM is brought forward. A 4 input-2 output fuzzy controller has been designed in this paper, whose fuzzy control rules can imitate the experience of a skilled operator 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 flowchart of the main control part of the fuzzy control system of extruder.The automation control system of extruder adopting fuzzy control can greatly improve the automation degree of produce, through which one worker can operate several product lines easily, the productivity can be enhanced fairly. In addition, the analog quantity and switch quantity control of the former system is replaced by the digital quantity control, which can improve precision of production and reliability of the system. The study can benefit the whole set's design and produce of domestic wire and cable industry, and it will result in quite great economic value with further research and debug work. |
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