重度混合动力汽车燃油经济性和排放多目标优化

Multi-objective Optimization for the Fuel Economy and Emissions of Full Hybrid Electric Vehicle

考虑重度混合动力汽车运行模式切换时发动机频繁起停对油耗的影响,建立了整车动态仿真模型和综合考虑燃油消耗和排放的多目标优化模型,采用简化控制变量的动态规划算法并结合自动变速器经济性换挡规律,在NEDC工况下对多目标优化模型进行仿真。结果表明,发动机的频繁起停对整车燃油消耗有显著影响,采用动态规划算法可全局优化整车燃油经济性和排放。

Taking into account the effects of frequent engine start/stop on fuel consumption during operation mode switch of a full hybrid electric vehicle,a vehicle dynamic simulation model and a multi-objective optimization model with concurrent consideration of fuel consumption and emissions are established.By adopting dynamic programming algorithm with simplified control variables,combined with economic shift schedule of automatic transmission,a simulation on multi-objective optimization model with NEDC driving cycle is conducted.The results show that the engine＇s frequent start/stop has significant effects on fuel consumption and adopting dynamic programming algorithm can globally optimize the fuel economy and emissions of vehicle.