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结合形状复杂、易变形渗氮工件工艺优化的需求,运用模糊控制对一台气体渗氮炉的炉温控制系统进行技术改进。首先分析了单一的PID温控方式和模糊温控方式的不足,随后根据工艺升温过程优化的要求提出采用PID控制和模糊控制相结合的(Fuzzy-PID复合控制)两段控温方式,进一步,由控温经验设计模糊温度控制器并在MATLAB7.0软件平台上进行温控系统的仿真实现。仿真结果表明,Fuzzy-PID复合温度控制器的控温效果较单一PID温度控制器的控温效果为好,此仿真研究结果对气体渗氮工艺升温过程的优化有着积极的指导作用。
Combining with the demand of process optimization of complicated and easily deformed nitriding workpieces, the furnace temperature control system of a gas nitriding furnace is improved by fuzzy control. Firstly, a single PID temperature control method and fuzzy temperature control method are analyzed. Then two temperature control methods based on Fuzzy-PID control are put forward according to the requirements of process temperature optimization. Fuzzy temperature controller is designed by temperature control experience and the simulation of temperature control system is implemented on MATLAB7.0 software platform. The simulation results show that the temperature control effect of the Fuzzy-PID composite temperature controller is better than that of the single PID temperature controller. The simulation results have a positive guiding effect on the optimization of the gas nitriding process.