An overall efficiency definition is proposed with considerations of the power losses in engine, several electric motors, power coupling mechanism and battery pack. The efficiency models for planetary coupling mechanism, engine, motors and battery pack are built respectively, based on which an overall power flow efficiency model for a dual-mode electro-mechanical variable transmission system is established with enhancing energy transfer efficiency as objective, and an optimization is conducted. Then the optimized results are input to a comprehensive controller for hardware-in-the-loop simulation. The results of simulation show that the method of overall power flow efficiency optimization can optimally coordinate the working points of engine and several motors according to overall efficiency, and compared with traditional power-flow optimization method based solely on engine optimal working re-gion, it further enhances the fuel economy and transmission efficiency of system. The research provides a theoretical basis for the development of overall control strategy and control system.%提出了综合考虑发动机、多个电机、功率耦合机构和电池组等功率损失的综合效率定义方法，分别建立了行星耦合机构、发动机、电机和电池组的效率模型。再以提高能量传递效率为目标为双模式机电复合无级传动系统建立了功率流综合效率优化模型，并进行优化。将优化结果写入综合控制器中进行硬件在环仿真。结果表明，功率流综合效率优化方法可根据综合效率最优协调发动机和多电机的工作点，与基于发动机最优工作区域的传统的功率流优化方法相比，能进一步提高系统的燃油经济性和传动效率。本研究为开发综合控制策略和控制系统提供了理论基础。
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