中文摘要：

为了提升传统自动变速箱的运行效率,基于拉威挪行星齿轮系设计了结构紧凑的新型复合功率分流装置,推导了该功率分流装置的运动学和动力学关系式。通过集成并匹配两电机,构成了新型电子式无极变速器,应用杠杆法对其进行结构等效简化,并对其电功率分流特性和系统传动效率进行了分析,提出了增加两制动器的结构优化方案。建立了搭载该变速箱的混合动力系统数学方程,应用等效杠杆模型对系统的工作模式和控制策略进行分析,并利用离线仿真对结构优化前后的整车动力性和燃油经济性进行了对比验证。研究结果表明：采用优化方案后,系统增添了发动机直驱模式和3种纯电动模式,使得其动力性和经济性分别提升了8.6%和5.6%。

英文摘要：

In order to enhance the operating efficiency of conventional automatic transmission,based on the ravigneaux gear set,a novel compound power-split device with compact structure was designed,and the dynamic and kinematic equations of the compound power-split device were derived.By integrating and matching two motors with the compound power-split device,a new electronic-continuously variable transmission was constructed.An equivalent lever diagram was used to simplify the structure,and then an advanced structure with two brake clutches was presented based on the analysis of the electrical power-split characteristics and efficiency of the transmission.The mathematic equations of hybrid powertrain which was equipped with this optimized transmission were established,and the operating modes and the control strategies were analyzed by utilizing the equivalent lever diagrams.The power and economic performance of the proposed compound power-split transmission were validated by the off-line simulation and compared with previous design.The results show that the modified transmission can give additional engine direct driving mode and 3electric driving modes,and the power and economic performance are both raised by 8.6% and 5.6%respectively.