What control method is used in the sterilization pot’s control system (e.g., PID control, fuzzy control)?
In fields such as food processing and medical‑device manufacturing, sterilization kettles are critical equipment for ensuring product quality and safety. The control system of a sterilization kettle is one of the key factors determining its performance and effectiveness. Among the various control strategies, the choice of control method is particularly important; common approaches include PID control and fuzzy control. PID control—proportional–integral–derivative control—is a classic and widely used technique. It adjusts the output signal by computing the proportional, integral, and derivative terms of the error, thereby achieving precise regulation of the controlled process. In a sterilization kettle, PID control can continuously monitor the deviation between the actual and set values for parameters such as temperature, pressure, and time, and accordingly modulate heating power, steam flow, or other control variables. The advantages of PID control lie in its simplicity, ease of understanding and implementation, and its ability to deliver stable, accurate performance in many applications. For example, when the temperature inside the sterilizer falls below the setpoint, the PID controller increases the heating power to raise the temperature rapidly; as the temperature approaches the setpoint, the controller gradually reduces the power to prevent overshoot. However, PID control also has certain limitations. It struggles with complex processes that exhibit nonlinearity and time‑varying characteristics.
