It only needs routine closed-loop operating data and knowledge of the process time delay using minimum variance as a benchmark in controller performance assessment.
用最小方差准则来评价控制器的性能，仅需过程变量的常规闭环操作数据和过程的时间延迟特性。
Through analysis, we can find the controller has routine PID merit and works well in time delay or non - linear system, so it can be popularized and applied to the general industrial process.
分析发现，该控制器具有常规pid的优点，对于大纯滞后或非线性系统能够很好地工作，可以推广应用于一般工业过程。
Open-loop unstable system with time delay is difficult to control using routine control methods.
开环不稳定时滞系统是工业现场中常见的一类被控过程，这类系统控制难度高，控制精度难以保证。
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