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以一种功率分流式混合动力汽车(Power-split Hybrid Electric Vehicle,Power-split HEV)为研究对象,对耦合机构中行星排特征参数及主减速比参数以经济性和动力性双目标函数进行优化设计。利用整车仿真软件AVL/Cruise建立整车模型,在MATLAB/Simulink中建立整车控制策略,结合优化软件Isight设计优化模型。采用非支配排序遗传算法,以最高速作为动力性目标,等效百公里油耗量作为经济性目标对行星排特征参数及主减速比参数进行多目标优化,并对优化结果进行仿真对比。结果表明,在不改变整车控制策略以及保持整车动力性的前提下其等效百公里油耗下降了10%。
Taking a Power-split Hybrid Electric Vehicle (HEV) as the research object, the planetary flight parameters and the main reduction ratio parameters in the coupling mechanism are optimized by the economic and dynamic two-objective function design. The vehicle model AVL / Cruise is used to build the vehicle model, the vehicle control strategy is established in MATLAB / Simulink, and the optimization software Isight is used to design and optimize the model. The non-dominated ranking genetic algorithm was used to optimize the planetary flight parameters and the main reduction ratio parameters with the highest speed as the dynamic target and the equivalent fuel consumption of 100 km as the economic target. The simulation results were compared with the simulation results. The results show that without changing the vehicle control strategy and maintain the vehicle power under the premise of its equivalent 100 km fuel consumption decreased by 10%.