ECVT型混合动力城市客车动力系统设计与验证

针对传统客车集成启动/发电机一体化(integrated starter/generator, ISG)混合动力系统节油效果不理想的问题，选用电控无极自动变速(electronic continuously variable transmission, ECVT)混合动力系统方案，在插电式混合动力城市客车上应用并验证。在单行星排运动学特性的等效杠杆分析基础上，对某插电式ECVT动力系统关键部件进行参数匹配与计算；根据标定试验数据，采用Matlab/Simulink软件建立发动机仿真模型、驱动电机仿真模型和发电机仿真模型，搭建整车仿真模型；在中国典型城市公交循环工况下，研究目标车型的燃油经济性、动力性、纯电最大续航特性，完成经济性、动力性等道路测试试验。结果表明，本研究设计的ECVT混合动力系统汽车相较于传统汽车节油率达到57.47%，相较于ISG混合动力系统汽车节油率提高了24.12%。因此，插电式混合动力城市客车采用ECVT混合动力系统方案是可行有效的，且节油效果明显。

Design and verification of power system for ECVT hybrid electric city bus

Aiming at the problem that the integrated starter/generator(ISG) hybrid power system was not ideal in fuel saving effect, this study selected the electronic continuously variable transmission(ECVT) hybrid power system scheme, which was applied and verified in plug-in hybrid electric city bus. Based on the equivalent lever analysis of the kinematics characteristics of a single planetary line, the parameters of key components of a plug-in ECVT power system were matched and calculated. According to the calibration test data, Matlab/Simulink software was used to establish the engine simulation model, drive motor simulation model and generator simulation model, to build the vehicle simulation model. Under typical urban bus cycle conditions in China, the fuel economy, dynamic performance and pure electric maximum continuous voyage characteristics of the target vehicle were studied, and the road tests of economy and dynamic performance were completed. The results showed that the ECVT hybrid system vehicle designed in this study could achieve fuel saving rate of 57.47% compared with traditional vehicles, and 24.12% higher than ISG hybrid system vehicle. Therefore, the adoption of ECVT hybrid power system for plug-in hybrid city bus was feasible and effective, and had obvious fuel saving effect.