中文摘要：

为优化混合动力汽车动力系统设计，实现节能减排，提供新能源，运用功率键合图法建立了包含发动机、电机、动力耦合机构、超级电容、车身及底盘的混合动力汽车动力系统数学模型。采用发动机最优控制策略，在Simulink软件平的各项性能及动力系统动态特性进行仿真，并有效地提高了仿真的准确性。应用优化模型，仿真了行有关汽车的动力特征参数对整车各性能的影响．为混合动力系统的优化设计提供了理论依据。在平台上建立了包含整车动力系统和整车控制模块的混合动力汽车整车仿真模型，为混合动力汽车设计优化提供了科学依据。

英文摘要：

In order to optimize power system of hybrid electric vehicle （ HEV）, the bond graph methodology is used to model HEV including engine, motor-generator, coupling mechanism, super-capacitor, body and underpan. Based on it, the system state equation is given. A simulation model with engine optimal control strategy is proposed to research vehicle performance and dynamic characteristics of power system based on Simulink. This model improves simulation accuracy effectively. Simulation result of planet row characteristic parameter research provides theoretical foundation for HEV power system optimization.