针对一类由非线性增益函数与典型PID控制器级联组成的非线性系统，采用波波夫判据对此类闭环控制系统进行稳定性分析。

The stability of a nonlinear control system which consists of a sector bounded nonlinear gain in cascade with a fixed linear PID controller is analyzed using Popov stability criterion.

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用波波夫稳定判据得到了控制器稳定的充分条件。

Stability of the controller is guaranteed by Popov stability criterion.

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利用模糊控制器具有的输入输出比例特性及非线性系统的波波夫稳定判据，提出了在保证被控系统稳定的前提下模糊控制器的系统化设计方法。

A systematical method of fuzzy controller design is introduced based on the Popov stability criterion and proportion property of input to output of the fuzzy controller.

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