经对该变速系统的功率流模型的分析可知，基于无级变速系统的功率流数学模型的效率比常规级联式车用电传动系统高。

According to the analysis of the power flow model of this transmission, the efficiency of this transmission is higher than that of the cascade system in vehicle.

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只有通过改变结构，从原理上使能量流的传递方式发生改变，才能从根本上克服原有无级变速器的不足。

However, there is one kind of possible approach, in which mode of energy stream's transmission is changeable through changing structure.

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与三角形分析法比较，该方法具有形象、直观、易于理解的特点，能够迅速、准确地确定行星变速箱的功率流大小及流向。

Compared with the triangle method, the new way has the traits of visualizing, intuition, easy understanding, swift and nicety to determine the power currents and its direction of the planet gear box.

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