EVT是具有优良性能的混合动力方案，并成为混合动力汽车市场的主流，其中最有代表性的丰田THS系统全球累计销售超过700万辆。EVT是汽车动力传动创新的主流方向，目前主要通过在行星传动基础上增加离合器、制动器的方式来拓展EVT的工作范围，提升其性能，但如何设计EVT的构型还缺乏系统的理论和方法。. 本项目以EVT分流传动混合动力系统的传动构型为研究对象，通过研究EVT分流传动的传动构型的图论建模方式，研究传动构型的同构及剔除，基于动态规划DP优化构型，以添加离合器等构件实现方案继承和变异，研究行星耦合EVT的构型综合优化设计方法，为EVT分流传动混合动力系统的构型综合设计奠定理论和方法基础。

As EVT is an excellent performance HEV transmission, it is wildly accepted in the HEV market. For example, one of the most representative EVT system -Toyota THS, it was accumulatively saled more than 7 million units all over the world. EVT is the mainstream direction of automobile power transmission innovation, to develop a new type EVT, clutches are wildly used to expand the working range and to improve their performance of EVT. But how to design the topology structure of EVT is lack of method and studying experience. . In this project, we focused on the design method of EVT topology structure, and use a developing graph theory to build the model of the power split EVT, then, a method of how to judge the isomorphic of EVT topology structure will also be studied. And then, based on dynamic programming (DP), the EVT energy management optimization and type synthesis method will be studied . The study and results will help to design the optimal topology structure of EVT .