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。
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.
运用控制回路在闭环操作时的数据，采用相关辨识理论与技术，闭环辨识控制回路是否存在迟滞。
Using the operate data of closed control loops and the relevant theories and technique of identification to identify the existence of the valve stiction in the control loops.
经过在炼油厂的实际在线运行，表明该模型具有令人满意的精度，可用于稳定塔汽油蒸气压的闭环控制与优化操作。
The on-line application in Fujian Refinery shows that the model has a satisfactory accuracy, and it can be used for closed-loop control and optimal operation.
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