基于发动机在环的交通场景对重型车排放和油耗影响  

Effects of traffic scenarios on emission and fuel consumption characteristics for a heavy-duty-vehicle based on engine-inthe-loop methodology

作　　者：霍永占 高涛 汪晓伟 劳海亮 陈熊 张佑源 景晓军 HUO Yongzhan;GAO Tao;WANG Xiaowei;LAO Hailiang;CHEN Xiong;ZHANG Youyuan;JING Xiaojun(CATARC Automotive Test Center(Tianjin)Co.,Ltd.,Tianjin 300300,China;Dongfeng Liuzhou Motor Co.,Ltd.,Liuzhou 545000,China)

机构地区：[1]中汽研汽车检验中心(天津)有限公司,天津300300 [2]东风柳州汽车有限公司,柳州545500

出　　处：《汽车安全与节能学报》2023年第4期505-512,共8页Journal of Automotive Safety and Energy

基　　金：国家重点研发计划(2022YFC3703601)

摘　　要：研究了交通场景对重型柴油车排放和油耗的影响。选取一辆最大设计总质量24.5 t的自卸车,采用发动机在环(EIL)的方法,建立了车辆、道路和驾驶员模型。分析了长时间怠速后车辆再起动时选择性催化还原器(SCR)温度、拥堵状态停车时长和载荷对油耗和排放的影响。结果表明:当SCR温度在起喷温度附近时,车辆再次起动或加速行驶时,NOx排放较高。拥堵状态停车后,SCR温度显著降低,停车时间越长,NOx排放越高。满载和空载情况下,停车时间对颗粒物数量(PN)排放影响不大,但满载时PN排放显著增加。车辆载荷增加会降低制动比油耗(BSFC)和CO_(2)比排放,同时增加PN和NOx排放,但NOx排放在一定程度上会先增加后减小。To investigate the effects of traffic scenarios on emissions and fuel consumption of heavy-duty diesel vehicles.A dump truck with a maximum design total mass of 24.5 t was selected,and the engine-in-theloop(EIL)method was used to construct vehicle,road,and driver models.Examined the fuel consumption and emission characteristics under three typical scenarios:the re-starting after a long idle with selective catalytic reduction(SCR)temperature,the congestion-related stop duration,and the vehicle load.The results show that when the SCR temperature is near the injection temperature,the SCR catalytic conversion efficiency is low during re-starting or acceleration,especially when the urea is not in the injection state,leading to high NOx emissions.After a congestion-related stop,the SCR temperature significantly decreases,and the longer the stop duration cause higher NOx emissions.Under the same stop duration,the full load scenario has significantly higher cumulative particulate matter(PN)emissions and the specific emissions compared to the no-load scenario,while stop duration has little impact on it.As the vehicle load increases,the brake-specific fuel consumption(BSFC)and the CO_(2)-specific emissions decrease to some extent,while the cumulative PN emissions and the NOx emissions increase.The cumulative NOx emissions and the specific emissions show an initial increase followed by a decrease with the increase in vehicle load.

关 键 词：重型柴油车 污染物排放 交通流场景 发动机在环(EIL) 选择性催化还原器(SCR) 制动比油耗(BSFC) 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程] U467.11[机械工程—车辆工程]