装备CVT的中度混合动力轿车驱动工况下的能量优化策略

Energy Optimization Strategy for the Mild Hybrid Electric Vehicle with CVT Under Drive Conditions

针对装备CVT的混合动力汽车,提出了一种以混合动力系统效率最高为优化目标,以车速、加速踏板行程和电池SOC为状态变量,以电机转矩和CVT速比为控制变量的中度混合动力汽车能量优化策略。该策略综合考虑了驾驶员的实际操作和驱动需求以及各个关键部件的效率,确定了驱动工况各工作模式下的最优电机转矩和最优CVT速比,保证了混合动力系统的效率最高。采用自行搭建的前向仿真模型对所提出的能量优化策略进行了验证,结果表明:在NEDC循环工况下该车等效100km油耗比原型车降低了26.4%。

An energy optimization strategy is proposed for a mild hybrid electric vehicle （HEV） equipped with continuously variable transmission （CVT） with maximizing the efficiency of HEV as objective,vehicle speed,acceleration pedal travel and battery SOC as state variables,and motor torque and the speed ratio of CVT as control variables.With comprehensive consideration of driver＇s practical operation,drive requirements and the efficiencies of all key components,the strategy determines the optimal motor torque and CVT speed ratio under different working modes of drive condition,ensuring the highest efficiency of HEV.The energy optimization strategy proposed is verified with self-built forward simulation model.The results show that the equivalent fuel consumption per 100km with NEDC driving cycle is 26.4％ lower than that of original vehicle.