中文摘要：

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。

英文摘要：

Combined with the requirement on technology optimization of parts which have complex shape and are easy to be deformed in gas nitriding, a fuzzy control scheme was proposed to improve the temperature-control system of a gas nitriding electric-furnace. Firstly, the disadvantages of simplex PID temperature control way and fuzzy temperature control way are analyzed, then a two-stage＇ s temperature control way（Fuzzy-PID composite control）was adopted to meet the requirements on the optimization of heating process. Furthermore, the fuzzy controller was designed according to the experience of the operators. Finally, the simulation experiments were made based on the tool of MATLAB7.0. The results of simulation indicate that the temperature-control effect of the composite Fuzzy-PID controller is better than that of the conventional PID controller. Moreover, this result of research on simulation has an active guidance to the optimization of heating process for technology of gas nitriding.