为提升花椒干燥介质参数温度、湿度、风速的自控精度与稳定性，改善物料受热均匀性，保障干燥品质，设计了以西门子S7-200型可编程控制器（programmable controllers, PLC）为控制核心，EM235、EM232为扩展模块，包括温湿度控制、风速控制、红外灯管间歇转动以及余热回收等控制模块的模糊比例-积分-微分（proportional-integral-derivative, PID）花椒热风-红外并联干燥系统。系统通过MATLAB中的Simulink仿真比较传统PID和模糊PID对温度、湿度和风速的控制响应特性，实验验证其控制效果，分析干燥物料品质。在温度、风速和湿度控制中，相较于传统PID，模糊PID的最大超调量分别减少了6.39%、21.71%和23.40%，达到稳态的时间分别减少了4.0、4.7、5.9 s；在花椒干燥控制试验中，温度控制在稳定值60 ℃的误差≤± 0.4 ℃，湿度控制误差≤ ± 0.7%，风速稳定在2.0 m/s的误差≤ ± 0.05 m/s。控制系统响应速度快、运行平稳，控制精度高；依据标准和文献干燥成品的对比，本实验干燥品品质较佳。

To enhance the automatic control precision and stability of thermal parameters (temperature, humidity, and air velocity) in Zanthoxylum bungeanum drying processes, improve the thermal uniformity of materials, and ensure drying quality, a fuzzy PID(proportional-integral-derivative) control system for parallel hot air-infrared pepper drying was designed with Siemens S7-200 PLC as the core controller. The system configuration incorporated EM235 and EM232 expansion modules, integrating temperature-humidity regulation, air velocity control, intermittent infrared tube rotation, and waste heat recovery subsystems. Through Simulink simulations in MATLAB, comparative analyses of control response characteristics between conventional PID and fuzzy PID controllers were conducted for temperature, humidity, and air velocity parameters. Experimental verification demonstrated that the fuzzy PID controller achieved maximum overshoot reductions of 6.39%, 21.71%, and 23.40% in temperature, air velocity, and humidity control respectively, with corresponding steady-state time reductions of 4.0 s, 4.7 s, and 5.9 s compared to traditional PID. During pepper drying trials, temperature stabilization at 60 ℃ was maintained within ± 0.4 ℃ error bounds, humidity control errors were constrained to ≤± 0.7%, and air velocity deviations at 2.0 m/s remained below ± 0.05 m/s. The system exhibited rapid response characteristics, stable operation, and high-precision control performance. Comparative evaluations against standard specifications and literature data confirmed superior quality in the experimental dried products. .