The 48V mild hybrid system is a cost-efficient solution for original equipment manufacturers to meet increasingly stringent fuel consumption requirements.However,hybrid functions such as auto-stop/start and brake rege...The 48V mild hybrid system is a cost-efficient solution for original equipment manufacturers to meet increasingly stringent fuel consumption requirements.However,hybrid functions such as auto-stop/start and brake regeneration are unavailablewhen a 48V battery is at very low temperature because of its limited charge and discharge capability.Therefore,it is important to develop cost-efficient thermal management to warm-up the battery of a 48V mild hybrid electric vehicle(HEV)to recover hybrid functions quickly in cold climate.Following the model-based“V”process,we first define the requirements and then design different mechanisms to heat a 48V battery.Afterward,we build a 48V battery model in LMS AMESim and conduct co-simulation with simplified battery management system and hybrid control unit algorithms in MATLAB Simulink for analysis.Finally,we carry out a series of vehicle experiments at low temperature and observe the effect of heating to validate the design.Both simulation results and experimental data show that a cold 48V battery placed in a cabin with hot air can be heated effectively in the developed“Enhanced Generator Mode with 48V Battery”mode.The entire design is in a newly developed software that cyclically charges and discharges a 48V battery for quick warm-up in cold temperature without needing any additional hardware such as a heater,making it a cost-efficient solution for HEVs.展开更多
A system is developed to improve the series battery packs uniformities and charging protection and the implementation of battery equalization charging and protection system is also introduced. The functions of equaliz...A system is developed to improve the series battery packs uniformities and charging protection and the implementation of battery equalization charging and protection system is also introduced. The functions of equalization charging and overcharging protection are analyzed and the control model of series battery packs equalization charging is setup. The diverting-current and feedback bus voltage are measured during the series Li-ion battery packs equalization charging experiment. The field operation on Electric luxury transit bus BFC6100EV shows that the system betters the battery series charging uniformities and overcharging protection, improves the battery performance and extends the battery life.展开更多
根据混合动力客车锂离子动力电池组单体只数多、分布比较分散的特点,设计了基于双 CAN 总线的分布式电池管理系统(BMS)。该系统由若干采样模块和一个主控模块组成,与动力电池之间的连线数量少,可扩展性强,而且采用复杂可编程逻辑器件(CP...根据混合动力客车锂离子动力电池组单体只数多、分布比较分散的特点,设计了基于双 CAN 总线的分布式电池管理系统(BMS)。该系统由若干采样模块和一个主控模块组成,与动力电池之间的连线数量少,可扩展性强,而且采用复杂可编程逻辑器件(CPLD)技术实现了串联电池组单体电压的采样方法,实现了温度的低成本采样方法,建立了基于"预测-修正"方法的动力电池荷电状态(SOC)的估算方法,可以实时地修正 SOC估计的误差和可靠地实现对动力电池运行时状态参数的监测,提高电池 SOC 的估算精度。展开更多
针对电动汽车动力电池组的管理需求,设计了一款基于MC9S12XEP100和LTC6804的锂电池管理系统,实现对单体电池电压、电流和温度实时监控、电压均衡管理、热管理、充放电管理、数据存储和上位机显示功能。针对电池荷电状态(state of charge...针对电动汽车动力电池组的管理需求,设计了一款基于MC9S12XEP100和LTC6804的锂电池管理系统,实现对单体电池电压、电流和温度实时监控、电压均衡管理、热管理、充放电管理、数据存储和上位机显示功能。针对电池荷电状态(state of charge,SOC)估算精度和实时性方面的问题,提出了一种新颖的开路电压和安时积分融合型SOC估算方法,有效减小了开路电压处于平台期造成的误差影响。采用Arbin电池测试设备对上述功能和SOC估计方法进行了测试验证。结果显示,电池电压误差小于0.07 V,温度误差小于1℃,SOC估算误差小于1.2%,因此,设计系统可用于实际电动汽车动力电池组管理,实现电池SOC实时在线准确估计。展开更多
分析电动汽车电池管理系统的相关技术,提出了基于Thevenin的等效电路模型,并考虑均衡电路影响的电池荷电状态(State of Charge,SOC)算法规则,将测量结果与真实值结果进行比较,验证了改进后的电池组SOC算法满足设计要求,同时针对系统存...分析电动汽车电池管理系统的相关技术,提出了基于Thevenin的等效电路模型,并考虑均衡电路影响的电池荷电状态(State of Charge,SOC)算法规则,将测量结果与真实值结果进行比较,验证了改进后的电池组SOC算法满足设计要求,同时针对系统存在的不足提出改进建议,并对今后的工作进行展望。展开更多
文摘The 48V mild hybrid system is a cost-efficient solution for original equipment manufacturers to meet increasingly stringent fuel consumption requirements.However,hybrid functions such as auto-stop/start and brake regeneration are unavailablewhen a 48V battery is at very low temperature because of its limited charge and discharge capability.Therefore,it is important to develop cost-efficient thermal management to warm-up the battery of a 48V mild hybrid electric vehicle(HEV)to recover hybrid functions quickly in cold climate.Following the model-based“V”process,we first define the requirements and then design different mechanisms to heat a 48V battery.Afterward,we build a 48V battery model in LMS AMESim and conduct co-simulation with simplified battery management system and hybrid control unit algorithms in MATLAB Simulink for analysis.Finally,we carry out a series of vehicle experiments at low temperature and observe the effect of heating to validate the design.Both simulation results and experimental data show that a cold 48V battery placed in a cabin with hot air can be heated effectively in the developed“Enhanced Generator Mode with 48V Battery”mode.The entire design is in a newly developed software that cyclically charges and discharges a 48V battery for quick warm-up in cold temperature without needing any additional hardware such as a heater,making it a cost-efficient solution for HEVs.
文摘A system is developed to improve the series battery packs uniformities and charging protection and the implementation of battery equalization charging and protection system is also introduced. The functions of equalization charging and overcharging protection are analyzed and the control model of series battery packs equalization charging is setup. The diverting-current and feedback bus voltage are measured during the series Li-ion battery packs equalization charging experiment. The field operation on Electric luxury transit bus BFC6100EV shows that the system betters the battery series charging uniformities and overcharging protection, improves the battery performance and extends the battery life.
文摘针对电动汽车动力电池组的管理需求,设计了一款基于MC9S12XEP100和LTC6804的锂电池管理系统,实现对单体电池电压、电流和温度实时监控、电压均衡管理、热管理、充放电管理、数据存储和上位机显示功能。针对电池荷电状态(state of charge,SOC)估算精度和实时性方面的问题,提出了一种新颖的开路电压和安时积分融合型SOC估算方法,有效减小了开路电压处于平台期造成的误差影响。采用Arbin电池测试设备对上述功能和SOC估计方法进行了测试验证。结果显示,电池电压误差小于0.07 V,温度误差小于1℃,SOC估算误差小于1.2%,因此,设计系统可用于实际电动汽车动力电池组管理,实现电池SOC实时在线准确估计。
文摘分析电动汽车电池管理系统的相关技术,提出了基于Thevenin的等效电路模型,并考虑均衡电路影响的电池荷电状态(State of Charge,SOC)算法规则,将测量结果与真实值结果进行比较,验证了改进后的电池组SOC算法满足设计要求,同时针对系统存在的不足提出改进建议,并对今后的工作进行展望。
