车用重型柴油机排放测试循环设定与拓展研究  

Study on the Setting and Expansion of Vehicle Heavy-duty Diesel Engine Emission Testing Cycle

作　　者：张文博 魏齐飞 陆晨 ZHANG Wenbo;WEI Qifei;LU Chen(Shanghai Motor Vehicle Testing Center Technology Co.,Ltd.,Shanghai 201805,China)

机构地区：[1]上海机动车检测中心技术有限公司,上海201805

出　　处：《内燃机》2024年第1期7-12,共6页Internal Combustion Engines

摘　　要：由于部分车辆如城市环卫车、自卸车和城市物流车等在低速低负荷下的运行工况占比较大。但国六重型柴油机在进行型式排放认证时的排放测试循环(WHTC)的较低负荷(20%以下)的占比仅为58.1%,缺乏高低负荷突变等典型特征的覆盖,这会导致该类认证无法有效评估发动机低负荷运行时的NO_(x)排放特性。因此,研究重型柴油机车辆在低速低负荷下的NO_(x)排放水平对未来的国家标准制定具有一定参考意义。本文对国六重型柴油机的台架非标准排放测试(WNTE)的循环控制区域进行了重新设定,重点研究柴油机低负荷下的NO_(x)排放。研究将WNTE循环控制区域的转速范围设定在发动机怠速到n30之间,负荷范围设定在0~20%范围内。并选用额定功率为130kW、280kW和413kW的三台柴油机,进行多组相应设定的WNTE试验。试验结果显示,三台发动机的NO_(x)排放均有超出GB 17691—2018要求限值的情况,超出的范围为17.3%~627%。Among the heavy-duty diesel engine vehicles in China VI,some vehicles,such as urban sanitation vehicles,dump trucks,and urban logistics vehicles,account for a larger proportion of the operating conditions at low speeds and low loads.However,WHTC used by China VI of heavy-duty diesel engines during type certification has a low load(below 20%)ratio of only 58.1%,lacking typi-cal features such as high and low load mutations.This leads to an inability to effectively evaluate the NO_(x) emission characteristics of the engine at low loads during this type of certification.Therefore,studying the NO_(x) emission levels of heavy-duty diesel vehicles under low-speed,low-load conditions has reference significance for the development of future national standards.This article redefines WNTE cycle control region for China VI of heavy-duty diesel engines,focusing on the study of NO_(x) emissions under low loads.The WNTE cycle control region's speed range is set between the engine's idle speed and n30,and the load range is set between 0 and 20%.Three diesel engines with rated powers of 130kW,280kW,and 413kW are selected to conduct multiple WNTE tests as defined in this article.The test results show that all three engines have NO_(x) emissions that exceed the limit values required by GB 17691—2018,with the range of exceedance being 17.3%to 627%.

关 键 词：柴油机 低速 低负荷 NO_(x)排放 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]