The temperature sampling period is generally 10~30s, generally 20s；;

The parameter setting of PI is generally tried and tested by experiments. Because the mathematical model of PID control system is complicated, the calculated value is far from the actual value after conventional mathematical modeling, so KP is generally set first, then KI is set, and PI is generally selected for temperature regulation, and D is a differential term, which is not commonly used in this type of system.