The relay feedback self-tuning PID based on internal model control (IMC) was adopted for self-tuning PID controller for long time-delay process.
大时滞过程的自整定pid控制器，采用基于内模控制策略的继电型PID自整定。
There always exist long delay time in process control and good control effects may not be obtained by using traditional control methods.
工业生产过程中常有大时滞存在，用传统控制方法不能获得满意的控制效果。
Papermaking process is very complex and there exists long delay time.
造纸生产过程中的定量／水分控制十分复杂，存在着大时延的问题。
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