基于粒径分布的直喷汽油车颗粒物排放特性研究

doi:10.19562/j.chinasae.qcgc.2022.10.016

Abstract

Abstract:

Taking a national VI standard gasoline direct injection vehicle （GDIV） equipped with an exhaust particulate filter as the research object， the particle number （PN） emission concentration of different particle size ranges in the exhaust gas is measured by two instruments， namely， condensation particle counters （CPC） and electrostatic low voltatge impactor （ELPI+）. The worldwide harmonized light vehicle test cycle （WLTC） cold-start test is carried out on a chassis dynamometer， and the test results show that in the ultra-high-speed section of the WLTC cycle test， the measurement results of ELPI+_29~2 500 nm is 1 order of magnitude higher than that of CPC_23~2 500 nm， with ELPI+_6~29 nm ultrafine particulate matter as the main body of PN emission accounting for up to 97.5%. Under hot start conditions， the high-speed section and ultra-high-speed section of the WLTC cycle show that the poor original exhaust of the engine and the continuous regeneration reaction of the gasoline engine particulate trap lead to large amount of ultra-fine particulate matter emission. To reduce the impact of vehicle particulate matter emissions on the environment and human health， it is necessary to conduct in-depth research on the particle size distribution of vehicle exhaust particles， and pay more attention to ultra-fine particles below 23 nm.

Key words: in-cylinder direct injection gasoline vehicle, National VI, particle size distribution, WLTC, PN emission con-centration, ultrafine particulate matter

Xiaohan Jiang,Jianwei Tan,Changjian Xu,Yunshan Ge,Lijun Hao,Xin Wang,Jiachen Li. Research on Particle Emission Characteristics of Direct In-jection Gasoline Vehicles Based on the Particle Size Distribution[J].Automotive Engineering, 2022, 44(10): 1609-1618.

Figures/Tables 11

名称	类别	冷起动下WLTC 循环试验结果			热起动下重点工况试验结果
名称	类别	CPC_23~ 2 500 nm	ELPI+_6~ 2 500 nm	ELPI+_29~ 2 500 nm	CPC_23~ 2 500 nm	ELPI+_6~ 2 500 nm	ELPI+_29~ 2 500 nm
$u C P N$	B类	5.744	5.744	5.744	5.744	5.744	5.744
$u v$	B类	1.001	1.001	1.001	1.001	1.001	1.001
$u d$	B类	0.577	0.577	0.577	0.577	0.577	0.577
$u r e p$	A类	5.171	5.026	5.009	5.572	5.125	5.212
$u P N$	合成	7.837	7.742	7.708	8.107	7.806	7.842

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参数	测试车辆
供油方式	缸内直喷
发动机排量/L	2.0
进气方式	涡轮增压
后处理装置	TWC+GPF
压缩比	10
最大功率/kW	160
最大转矩/（N·m）	380
整车质量/kg	2 055

项目	低速段	中速段	高速段	超高速段	WLTC循环
CPC_23~2 500 nm	1.57×10¹²	1.71×10¹¹	1.01×10¹¹	1.57×10¹¹	5.96×10¹¹
ELPI+_6~29 nm	1.5×10¹²	1.27×10¹¹	7.37×10¹⁰	3.56×10¹⁴	6.45×10¹³
ELPI+_6~2 500 nm	3.27×10¹²	2.99×10¹¹	1.72×10¹¹	3.65×10¹⁴	6.66×10¹³
ELPI+_29~2 500 nm	1.77×10¹²	1.72×10¹¹	9.82×10¹⁰	8.36×10¹²	2.15×10¹²

Research on Particle Emission Characteristics of Direct In-jection Gasoline Vehicles Based on the Particle Size Distribution

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