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。
This paper proposes a new nonlinear PID model of valve controller based on nonlinear tracking-differentiator, nonlinear norm and PID adjustor.
首先对非线性PID方法的基础元件——跟踪微分器进行了改进，以提高其性能。
Tracking differentiator as an elementary unit for nonlinear PID technology is improved so that it can yield better differential signal.
同时用非线性跟踪-微分器代替差分法来提取微分信号，提高了微分信号的品质。
Meantime, differential signal is distilled by nonlinear tracking-differentiator instead of the method of difference, which improves the quality of differential signal.
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