实际道路工况下“油改气”双燃料出租车的排放特征

doi:10.13229/j.cnki.jdxbgxb20210499

Abstract

Abstract:

In order to study and evaluate the impact of "oil-to-gas" in traditional gasoline taxis on emissions， two typical China Ⅳ and China Ⅴ "oil-to-gas" dual-fuel taxis were selected as test vehicles in Tangshan City， the actual road gaseous pollutants （CO， CO₂， NO _x ） and particulate matter （PN） emission were tested by PEMS （SEMTECH-DS and ELPI）， and the emission characteristics and differences of "oil-to-gas" dual-fuel taxis under different road types and speed conditions. The results show that compared with gasoline fuel， the CO， CO₂ and PN emission factors of two test vehicles fueled by CNG were reduced by 31.0%~88.6%， 19.8%~23.8% and 79.3%~85.7% respectively， while NO _x emission factors were increased by 4.4 and 1.7 times respectively. Meanwhile， the CO₂， PN， and China Ⅳ test vehicle CO emission factors in different road types/speed ranges were significantly reduced， while China Ⅴ test vehicles CO emission factors were reduced except for urban roads/low-speed ranges （vehicle speeds <50 km/h）， it was relatively higher in the suburbs and in the middle and high speed range where the vehicle speed higher than 50 km/h. The "oil-to-gas" dual fuel effectively reduced the PN emission in each particle size section， and the peak PN concentration at the particle size 9 nm was reduced by 79.7% to 82.5%. Under the two fuel conditions， the PN emissions of test vehicles with a particle size of less than 23 nm accounted for 71.6%~96.9% of the total PN emissions， and the China V was significantly higher than the China Ⅳ， and the natural gas fuel was higher than the gasoline fuel.

Key words: actual road, “oil-to-gas” dual-fuel, taxi, portable environmental measuring system（PEMS）, particulate matter, gaseous emissions

CLC Number:

U467.1

Ji-guang WANG,Hua-qiao GUI,Zhi-wen YANG,Da-wei QU,Tong-zhu YU,Hong-jun MAO. Emission characteristics of "oil⁃to⁃gas" dual fuel taxis under actual road conditions[J].Journal of Jilin University(Engineering and Technology Edition), 2023, 53(1): 94-104.

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References 36

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参数	No.1	No.2
车辆品牌	北京现代
燃料类型	汽油/CNG双燃料（油改气）
发动机技术	自然吸气+多点电喷+CVVT
基准/总质量t	1.29/1.66	1.32/1.65
发动机最大功率/kW	90.2	82
排量/L	1.6	1.6
排放控制技术	TWC	TWC
排放标准	国Ⅴ	国Ⅳ
生产制造日期	2017.04	2012.12
注册登记日期	2017.06	2013.03
已行驶里程/km	127 978	723 303
挡位	6挡手动	5挡手动

道路 /工况类型	速度 /（km·h^-1）	RPA /（m·s^-2）	停车次数 /km	工况比例/%
道路 /工况类型	速度 /（km·h^-1）	RPA /（m·s^-2）	停车次数 /km	加速	匀速	减速	怠速
市区	24.5±1.0	0.201±0.014	1.39±0.09	33.1±1.9	13.3±1.6	23.3±0.9	30.2±2.5
郊区	71.1±2.1	0.096±0.027	—	29.9±8.8	49.1±13.2	21.0±4.7	0
高速	96.6±1.7	0.044±0.011	—	6.6±5.1	84.5±9.9	9.0±5.1	0
综合	33.6±1.7	0.150±0.009	0.85±0.04	31.2±1.9	21.2±1.4	22.2±1.0	25.4±1.9
NEDC	33.6	0.111	1.2	23.2	37.6	16.6	22.6
WLTC	46.6	0.152	0.4	30.6	27.8	29	12.6
CLTC	29	0.166	0.8	28.8	22.7	26.4	22.1

排放标准	道路类型	燃料种类	NO _x / （g·km^-1）	CO₂/ （g·km^-1）	CO/ （g·km^-1）	PN/ km
国Ⅴ	市区	CNG	0.10±0.01	220±4	0.3±0.11	1.2E+10
	市区	汽油	0.08±0.03	276±33	1.12±0.19	4.4E+12
	郊区	CNG	0.10±0.01	108±1	1.15±0.2	9.8E+11
	郊区	汽油	0.04±0.01	149±13	0.63±0.52	1.3E+13
	高速	CNG	0.09±0.01	118±3	1.58±0.21	4.2E+13
	高速	汽油	0.05±0.02	159±2	1.45±0.51	2.1E+14
	综合	CNG	0.10±0.01	173±4	0.78±0.05	9.1E+12
	综合	汽油	0.06±0.02	227±16	1.13±0.09	4.4E+13
国Ⅳ	市区	CNG	1.69±0.1	206±3	2.37±0.19	4.3E+11
	市区	汽油	0.30±0.07	249±10	18.98±1.98	1.0E+13
	郊区	CNG	1.35±0.2	114±6	1.36±0.12	3.2E+12
	郊区	汽油	0.25±0.07	141±9	14.06±3.14	4.0E+13
	高速	CNG	1.47±0.14	114±4	1.1±0.28	1.9E+13
	高速	汽油	0.33±0.02	146±5	12.41±4.87	1.0E+14
	综合	CNG	1.57±0.11	170±2	1.95±0.13	5.0E+12
	综合	汽油	0.29±0.06	212±6	17.14±1.98	3.5E+13

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Emission characteristics of "oil⁃to⁃gas" dual fuel taxis under actual road conditions

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