We give general integral of quadratic differential system with center in two cases under the Chinese classification.

本文给出在中国分类之下二次微分系统有中心时两种情况的通积分。

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Simulation results show that this method can detect and estimate the system error notably. Meanwhile the precision of matching diagnose in differential domain is higher than that in integral domain.

仿真计算结果表明该方法能够有效地发现和估计系统误差，同时指出在积分域进行匹配诊断和估计的精度要优于微分域匹配诊断。

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The LED system shall use integral and differential nonlinear control.

LED控制系统可以进行整体的和局部的非线性控制。

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