This paper proposes a new nonlinear PID model of valve controller based on nonlinear tracking-differentiator, nonlinear norm and PID adjustor.

文章基于非线性跟踪微分器、非线性度变换以及PID校正的思想，构造了一种新的非线性PID控制结构。

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The fuzzy controllers were used to replace PID torque adjustor and PID flux adjustor of VVVF vector control system.

用模糊控制器代替VVVF矢量控制系统的PID转矩调节器和PID磁链调节器。

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The fuzzy controllers were used to replace PID torque adjustor and PID flux adjustor of VVVF vector control system.

用模糊控制器代替VVVF矢量控制系统的PID转矩调节器和PID磁链调节器。

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