The concurrent use of statistical process control and engineering process control involves monitoring manipulated and controlled variables. One multivariate control chart may handle the statistical monitoring of all variables, but observing the manipulated and controlled variables in separate control charts may improve understanding of how disturbances and the controller performance affect the process. In this article, we illustrate how step and ramp disturbances manifest themselves in a single‐input–single‐output system by studying their resulting signatures in the controlled and manipulated variables. The system is controlled by variations of the widely used proportional‐integral‐derivative(PID) control scheme. Implications for applying control charts for these scenarios are discussed.

中文翻译：

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在反馈控制下监控工业过程

统计过程控制和工程过程控制的同时使用涉及监视操纵变量和受控变量。一个多变量控制图可以处理所有变量的统计监视，但是在单独的控制图中观察操纵变量和受控变量可以增进对干扰和控制器性能如何影响过程的理解。在本文中，我们将通过研究在受控变量和受控变量中产生的信号签名，来说明阶跃和斜坡扰动如何在单输入单输出系统中表现出来。该系统由广泛使用的比例积分微分（PID）控制方案的变化控制。讨论了在这些情况下应用控制图的含义。