Traditional single loop control systems can not ensure the whole anti interference designing.

传统的单回路控制系统很难使系统完全抗干扰。

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Nowadays, single loop PID controllers are still being employed in about 80%to 90%of the control systems. However, interactions exist in many complex industry systems.

当前，生产现场控制回路约80%—90%采用单回路PID，然而在一些大型的复杂的工业生产过程中，系统的各个回路之间存在着耦合现象。

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