目的 为了提高包装机热合装置压合袋口的封口质量，采用模糊自适应PID控制方法对热合机热合装置的温度进行精确控制。方法 针对食品包装塑料薄膜热封的温度控制，基于模糊自适应PID控制算法设计一种自动包装机热封温度控制系统。采用变论域模糊PID实现控制参数自整定和控制规则的自调整，并将其与传统PID控制进行对比。结果 模糊PID控制方法较传统PID控制方法能更稳定地控制加热温度，有效提高了温度控制的响应速度和控制精度。结论 该系统在热合装置中能够精确、快速地控制温度，具有应用价值。

The work aims to precisely control the temperature of the heat-sealing device of the heat-sealing machine used for sealing the plastic film bags in fuzzy adaptive PID control method, so as to improve the sealing quality of heat-sealing device for packaging machines. With respect to the control of heat-sealing temperature of packaging plastic film, a type of automatic heat-sealing temperature control system was designed based on fuzzy adaptive PID control algorithm. The self-tuning of control parameters and the self-adjusting of control rules were realized by using variable universe fuzzy PID. The control results were compared with those of traditional PID. The fuzzy PID control method could control the heating temperature in a more stable way than the traditional PID control and it improved effectively the response speed and precision of temperature control. The system can accurately and quickly control the heat-sealing temperature, and it has the application value.