基于STM32的密炼机自整定PID温控系统设计

Design of internal mixer self⁃tuning PID temperature control system based on STM32

针对密炼机温度控制系统中人工整定PID带来的系统响应不及时、误差大等问题,该文设计了一种基于STM32的自整定PID温度控制系统。对于电动阀只能单极性调节问题,通过设置适当的工艺点来控制继电输出。为提高震荡曲线的辨识,采用参数归一化方法计算震荡曲线的临界增益。考虑密炼机的工作环境和系统响应曲线的频率特性,加入带有临界滞环控制的继电控制方法,提高了特征参数的精确性,更好地整定了PID参数。应用结果表明,基于STM32的PID整定温度控制系统能够将温度误差控制在1℃左右,且控制时间相比于人工PID控制系统提高了30%,极大地满足了密炼机的温度控制要求,具有良好的实用价值。

Aiming at tackling the problem of untimely system response and large error caused by manual PID tuning in the internal mixer temperature control system,a self-tuning PID temperature control system based on STM32 is designed.For unipolar solenoid valves,relay output is performed by setting appropriate process points.In order to improve the identification of the oscillation curve,the critical gain of the oscillation curve is calculated by using the parameter normalization method.Considering the working environment of the internal mixer and the frequency characteristics of the response curve,a relay control method with critical hysteresis control is added to improve the accuracy of the characteristic parameters and better tune the PID parameters.The application results show that the PID self-tuning temperature control system based on STM32 can control the temperature error at about 1℃,and the control time is increased by 30%compared with the manual PID control,which greatly meets the temperature control requirements of the internal mixer and has a good performance practical value.