王婷婷，孙 强，王凝露，闫 伟，李国祥   

    摘要：动力系统的匹配直接关系到车辆的性能，在对混合动力车辆的研究中有着非常重要的地位，而混合度的研究是动力系统匹配中的关键。本文基于已选定的额定功率为220kw的柴油发动机，对混合动力车辆的电机进行匹配，对不同混合度下的车辆模型进行性能分析。通过Avl-Cruise软件对各混合度下的车辆模型进行仿真对比，选用等效油耗以及比排放量为评价指标，对不同混合度下混合动力车辆的性能进行了比较，研究了随着混合度的变化，车辆的经济性以及排放性能变化的规律，提出了适用于本混合动力系统的最佳混合度。

    关键字：重型并联混合动力；混合度（DOH）；等效油耗；排放

    Abstract：The degree of hybridization (DOH) is a key point in matching a powertrain for HEV. Matching of the powertrain will affect directly vehicle performance and so it is very important in the study of hybrid electric vehicle. Basing on the selected diesel engine rated 220kW, the paper studies the matching of the electric motor with hybrid vehicle and analyzes the performance of the vehicle model at different degrees of hybridization. The simulation comparison is done to the vehicle model at different degrees of hybridization with the AVL-Cruise software, while fuel consumption and emissions are used as data to analyze the vehicle performance. The rule that vehicle economy and emissions will change with the degree of hybridization is studied. This paper proposes the degree of hybridization for the hybrid powertrain.

    Key Words：Heavy-Duty Parallel HEV; Degree of Hybridization (DOH); Simulation