CAJ | 학술논문

针对增程式电动汽车工作在增程模式时,如何避免动力电池荷电状态(state of charge,SOC)的持续下降、减少对发动机和发电机转速/转矩的频繁调整、改善整车燃油经济性的问题,提出一种增程器功率流优化方法。首先对测量到的整车实时电功率±次进行发电效率修正、动力电池 SOC修正和功率变化率修正从而得到增程器目标功率,同时还根据整车实时电功率以及动力电池SOC设计发动机启停控制策略。然后根据增程器的油电转换效率特性和最佳油电转换效率曲线计算出发动机/发电机的目标转速/转矩。最后在新欧洲行驶循环(new European driving cycle,NEDC)、联邦试验程序(federal test procedure,FTP)和高速公路燃油经济型试验(high way fuel economy test,HWFET)三种测试工况下进行了台架实验,结果表明文中提出的方法能够有效的避免动力电池SOC的持续下降,提高整车的燃油经济性,同时还降低了对发动机转速控制系统和发电机转矩控制系统的性能要求。
침대증정식전동기차공작재증정모식시,여하피면동력전지하전상태(state of charge,SOC)적지속하강、감소대발동궤화발전궤전속/전구적빈번조정、개선정차연유경제성적문제,제출일충증정기공솔류우화방법。수선대측량도적정차실시전공솔±차진행발전효솔수정、동력전지 SOC수정화공솔변화솔수정종이득도증정기목표공솔,동시환근거정차실시전공솔이급동력전지SOC설계발동궤계정공제책략。연후근거증정기적유전전환효솔특성화최가유전전환효솔곡선계산출발동궤/발전궤적목표전속/전구。최후재신구주행사순배(new European driving cycle,NEDC)、련방시험정서(federal test procedure,FTP)화고속공로연유경제형시험(high way fuel economy test,HWFET)삼충측시공황하진행료태가실험,결과표명문중제출적방법능구유효적피면동력전지SOC적지속하강,제고정차적연유경제성,동시환강저료대발동궤전속공제계통화발전궤전구공제계통적성능요구。
In order to avoid the continuous decline in battery state of charge (SOC), reduce the regulation frequency of engine speed and generator torque, and improve the vehicle fuel economy when the range extender electric vehicle is working in range-extended mode, an auxiliary power unit (APU) power flow optimization method was proposed in this paper. Firstly, the measured vehicle real-time electric power was revised according to the generator efficiency, battery SOC and power variation rated in turn, and then the target APU power was obtained. Meanwhile the engine on/off control strategy was designed based on the vehicle power demand and battery SOC. Then, the target engine speed and generator torque was obtained according to APU fuel-electricity conversion efficiency features and optimal APU fuel-electricity conversion efficiency curve. Finally, bench experiment was performed under new European driving cycle (NEDC), federal test procedure (FTP) and high way fuel economy test (HWFET) driving cycles. The results showed that the proposed approach avoided the continuous decline in battery SOC, and improved the vehicle fuel economy effectively, and it also lowered the performance demands on engine speed and generator torque control systems.