摘要
本文中选取了一台7.8 L的重型柴油机,在发动机台架上运行WHSC(世界统一稳态循环)、冷热态WHTC(世界统一瞬态循环),并通过发动机在环的方法在发动机台架上运行重型柴油车实际道路(PEMS)循环,采用能够同时测量PN10(10 nm以上颗粒物数量)和PN23(23 nm以上颗粒物数量)的颗粒计数器等设备测量了细小颗粒物排放。结果表明:PN10和PN23的PEMS工况瞬态排放的变化规律基本一致。PN10的比排放比PN23的比排放高。重型车PEMS中高速高负荷区间PN排放增加很快,且此时排放的颗粒物粒径较大,PN10和PN23的差异不明显。在中速区间,PN10的排放显著高于PN23。WHTC和基于EIL的PEMS两种测试工况的发动机运行工况点差异很大。基于EIL的开发方式能够在发动机台架上进行整车PEMS颗粒物排放的评估。
In this paper,a 7.8 L heavy-duty diesel engine is selected to run WHSC(world harmonized steady-state cycle),hot and cold WHTC(world harmonized transient-state cycle),as well as real driving emission test(PEMS)based on engine-in-the-loop(EIL)methodology on the engine test bench. The fine particle emissions are measured by using a particle counter which can simultaneously measure PN10(number of particles above10 nm)and PN23(number of particles above 23 nm). The results show that the transient emission of PN10 and PN23 have basically the same trends under different cycles. The specific emission of PN10 is higher than that of PN23. The PN emission of heavy-duty vehicle in the middle and high-speed and high-load range of PEMS test increases rapidly with a larger particle size,resulting in an minor difference between PN10 and PN23.In the midspeed range,PN10 emissions are significantly higher than PN23. The engine operating points of the two test conditions of WHTC and EIL-based PEMS are quite different. The EIL-based methodology enables the assessment of PN emissions for heavy-duty vehicle PEMS test on the engine test bench.
作者
汪晓伟
景晓军
高涛
谷雪景
张佑源
吴琳琳
Wang Xiaowei;Jing Xiaojun;Gao Tao;Gu Xuejing;Zhang Youyuan;Wu Linlin(CATARC Automotive Test Center(Tianjin)Co.,lid.,Tianjin 300300;Chinese Research Academy of Environtnental Sciences,Beijing 100012;Dongfeng Liwzhou Motor Co.,Ltd.,Liu Zhou 545000)
出处
《汽车工程》
EI
CSCD
北大核心
2022年第1期58-63,72,共7页
Automotive Engineering
基金
国家重点研究计划(2019YFC0214800)资助。
