热真空试验中的自校正PID控制策略

Self-tuning PID control strategy for thermal vacuum tests

通过引入自校正PID控制策略解决热真空试验温度调节过程中存在的长滞后问题。首先,采用带遗忘因子的递推最小二乘法对未知模型的特征参数进行在线辨识;然后,进行自校正PID的控制律设计。仿真结果表明:该方法可以比较准确地辨识出模型特征参数;与传统的PID控制方法相比,具有响应速度较快、超调量较小等优点。

Aself-tuning PID control strategy is adopted for the temperature control problem with long time delays. First, the recursive least square method is used with a forgetting factor to identify on line the unknown characteristic parameters of the model. Then, a self-tuning PID control law is designed. The simulation results show that this method can accurately identify the characteristic parameters of the model and the self-tuning PID approach boasts faster response and smaller overshoot than the conventional PID control method.