Abstract: To address the difficulty of stably maintaining preset temperature and humidity during the operation of the steam tea fixing machine, a temperature and humidity regulation method based on the coordinated control of microwave perturbation and fuzzy PID was proposed.This method applied microwave perturbation technology to humidity control and employed the fuzzy PID algorithm for precise temperature regulation, effectively solving the technical challenge of mutual interference between temperature and humidity parameters in traditional control methods. When the fixing temperature was 95 ℃, the humidity was 95%, and the time was 1 min, although slight fluctuations existed in the temperature and humidity, they were consistently maintained within a small controllable range. The results showed that the temperature and humidity control method combining microwave perturbation and fuzzy PID could effectively ensure the stability of the internal environment of the steam tea fixing machine, keeping the tea leaves in the optimal fixing state. This precise temperature and humidity control method not only significantly improved the consistency and repeatability of the fixing process but also enhanced the quality of the finished tea products, providing reliable assurance for the formation of excellent flavor characteristics and nutritional value of tea.

Key words: microwave perturbation, steam tea fixing machine, temperature and humidity control, fuzzy PID, control technology