The model-free control is especially useful for real nonlinear systems whose model parameter are very difficult to be identified and time varying.

此无模型控制方法非常适用于实际的模型参数难以辨识，且是时变的非线性系统。

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The state variable approach of modern control theory provides a uniform and powerful method of representing systems of arbitrary order, linear or nonlinear, with time-varying or constant coefficients.

现代控制理论的状态变量法提供了一种统一、高效的方法来描述具有任意阶次、线性或非线性、时变或常系数的各种系统。

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The model-free control is especially useful for real nonlinear systems whose orders and modeling are very difficult to be known and time varying.

无模型控制方法非常适用于实际的阶数难以知道或难以辨识，且是时变的非线性系统。

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