因此，要提高产品的性能，应优化总体方案，协调性能参数，并提高传动系效率。
So, in order to improve the production performance, it should optimize collectivity scheme, correspond performance parameter and improve power train efficient.
经济性就是传动系本身的功率损失要小，即效率要高。
Economic is that power losing of the transmission system should be small, namely efficiency should be high.
本文应用转化机构的基本概念分析了封闭式差动轮系，多自由度轮系和多重轮系的传动比、力矩和效率。
Based on the basic concept of transformed mechanism, transmission ratio, moment and efficiency of closed differential train, multiple freedom train and multiple train are analysed in this thesis.
结果表明，试验车的电动机主要工作于低效率区，说明其传动系的参数与整车参数匹配不合理。
The result shows that the motor of HEV6700 works mainly at the low efficient condition and that the parameter of the drive train does not match that of the vehicle.
目前，复杂周转轮系的功率流分析、传动比和啮合效率的计算既困难又繁复，而应用离散分析法可以改变这一局面。
It is difficult and complicated to analyze the power-flow of the complex epicyclic gear trains and compute their transmission ratio and meshing efficiency.
目前，复杂周转轮系的功率流分析、传动比和啮合效率的计算既困难又繁复，而应用离散分析法可以改变这一局面。
It is difficult and complicated to analyze the power-flow of the complex epicyclic gear trains and compute their transmission ratio and meshing efficiency.
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