摘要
为实现混合动力汽车的动力性、燃油经济性以及模式切换平顺性,以基于CVT的插电式混合动力汽车为研究对象,针对混合动力汽车的多目标优化问题,提出一种可变逻辑门限控制策略。整车控制过程中根据功率需求进行模式切换,其中行驶需求功率根据车速和节气门开度计算得到,切换门限根据整车参数实时计算。以发动机和电机的输出特性、电池的SOC为主要依据计算工作模式切换的可变逻辑门限值。通过电机助力保证整车具有较好的动力性能,通过不同模式下驱动功率的一致性实现模式切换平顺,通过小功率需求时仅可能多用纯电动来提高燃油经济性。在MATLAB/Simulink平台下建立混合动力汽车前向仿真模型,并在NEDC工况下进行仿真。仿真结果表明:整车动力性能得到了提高,实现了模式切换平顺性,节油40%。
To realize the HEV＇s dynamic performance,fuel economy and ride comfort of mode switching,aimed at multi-objective optimization for the plug-in HEV based on CVT,a variable logic threshold control strategy was proposed.In the vehicle＇s control process,the mode was switched according to power requirement,in which the power for driving requirement was computed according to velocity and throttle opening,and the mode switching threshold was calculated by vehicle＇s parameters.The variable logic threshold of mode switching was calculated according to engine output characteristics,motor output characteristics and battery state of charge.The vehicle＇s dynamic performance was ensured by assist of motor.By equalizing drive power under different modes,ride comfort of mode switching was realized.Fuel consumption was reduced by using electric mode as much as possible during low power requirement stage.A forward-facing simulation of the HEV was established on the MATLAB/Simulink platform,and the model was used under NEDC condition.The simulation result shows that the dynamic performance of the HEV was enhanced,the ride comfort in mode switching was realized,and the fuel consumption was reduced by 40%.
出处
《公路交通科技》
CAS
CSCD
北大核心
2012年第5期140-145,共6页
Journal of Highway and Transportation Research and Development
基金
国家高技术研究发展计划(八六三计划)项目(2012AA111710)
湖南省重大科技专项资助项目(2009FJ1018)
关键词
汽车工程
电动汽车
多目标优化
可变逻辑门限
仿真
automobile engineering
electric vehicle
multi-objective optimization
variable logic threshold
simulation
