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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front Envir Sci Eng    0, Vol. Issue () : 717-724    https://doi.org/10.1007/s11783-012-0438-3
RESEARCH ARTICLE
Impact of gasoline engine deposits on light duty vehicle emissions: in-use case study in Beijing, China
Xin YUE1,2(), Ye WU1, Xianjiang HUANG2, Yao MA2, Yuan PANG2, Xiaofeng BAO2, Jiming HAO1
1. School of Environment, Tsinghua University, Beijing 100084, China; 2. Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Abstract

Tailpipe emissions from light-duty gasoline vehicles usually deteriorate over time. The accumulation of engine deposits due to inadequate gasoline detergency is considered to be one of the major causes of such emission deterioration. Six in-use light-duty gasoline vehicles in Beijing were tested to investigate the impact of engine deposits on emissions of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx). Emissions under cold start and hot running test conditions from the six light duty vehicles were measured before and after engine deposits were removed. Results show that although individual vehicles reacted differently for each of the pollutants, elimination of engine deposits on average reduced HC emissions under hot running conditions by 29.4%, CO emissions under cold start conditions by 23.0% and CO emissions under hot running conditions by 35.5% (t<0.05 in all cases). No pollutant emissions increased with statistical significance (t<0.05) after the removal of engine deposits. Variations of emission changes upon removal of engine deposits were observed. Such variations are in line with previous studies, implying that the impact patterns of engine deposits on vehicle emissions may be subject to many influencing factors that are not fully understood and difficult to control under all conditions. A statistical view of the impact of engine deposits on vehicle emissions may be appropriate for evaluation of emissions reductions across a city or a country. It is necessary to maintain sufficient and effective gasoline fuel detergency in practice to keep the engines clean and in turn reduce vehicle emissions.

Keywords engine deposit      fuel quality      detergency      vehicle emission     
Corresponding Author(s): YUE Xin,Email:yuexin@craes.org.cn   
Issue Date: 01 October 2012
 Cite this article:   
Xin YUE,Ye WU,Xianjiang HUANG, et al. Impact of gasoline engine deposits on light duty vehicle emissions: in-use case study in Beijing, China[J]. Front Envir Sci Eng, 0, (): 717-724.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0438-3
https://academic.hep.com.cn/fese/EN/Y0/V/I/717
vehicleenginetransmissionmileage when acquired/kmyear of productioncertified emission standard
displacement/ccvalves/cylinderNo. of cylinderscylinder arrangement
GM Buick GL8249046V-type4 speed automatic554962007Euro 3
Volkswagen Santana 3000159524Inline5 speed manual449382008Euro 4
Volkswagen Jetta 1159524Inline5 speed manual1122262005Euro 3
Volkswagen Jetta 2159524Inline5 speed manual813632005Euro 3
Volkswagen Jetta 3159524Inline5 speed manual1045022005Euro 3
Volkswagen Jetta 4159524Inline5 speed manual1007042005Euro 3
Tab.1  Information on tested vehicles
propertytest methodunitvalue
sulfur contentASTM D5453% (m/m)0.00145
aromatics contentASTM D1319% (V/V)34.8
olefins contentASTM D1319% (V/V)13.6
benzene contentASTM D 3606% (V/V)0.3
oxygen contentASTM D4815% (m/m)0.52
Tab.2  Characteristics of test gasoline
vehicledepositscylinder 1cylinder 2cylinder 3cylinder 4cylinder 5cylinder 6average
BuickIVDs/mg209.596.896.875.375.5212.2127.7±65.1
CCD thickness/μm33.7±36.299.9±50.254.1±59.4100.3±56.367.5±51.237.5±14.865.5±29.4
SantanaIVDs/mg397.6275.2378.255.1--276.5±157.1
CCD thickness/μm12.4±8.911.1±5.518.2±9.014.5±5.4--14.1±3.1
Jetta 1IVDs/mg821.61042.1930.0737.6--882.8±132.2
CCD thickness/μm11.8±4.611.7±5.111.7±5.516.0±6.9--12.8±2.1
Jetta 2IVDs/mg953.7861.4807.3709.8--833.1±102.0
CCD thickness/μm15.8±16.922.0±17.422.1±13.631.7±16.1--22.9±6.6
Jetta 3IVDs/mg1110.6438.2852.7794.3--799.0±277.0
CCD thickness/μm22.4±9.328.6±7.422.1±7.219.7±17.6--23.2±3.8
Jetta 4IVDs/mg527.2327.7281.3229.6--341.5±130.2
CCD thickness/μm41.6±13.929.5±20.323.7±24.120.0±10.4--28.7±9.4
Tab.3  Vehicle engine deposits
emissions/(g·km-1)working conditionsdeposit conditions vs. emission reductionSantanaBuickJetta 1Jetta 2Jetta 3Jetta 4average reduction/%significance level
HCcold startoriginal0.160.190.580.340.360.57
deposits removed0.280.180.430.270.380.38
emissions reduction/%-755.2625.8620.59-5.5633.330.750.345
hot runningoriginal0.130.140.260.090.140.15
deposits removed0.130.020.160.080.110.12
emissions reduction/%085.7138.4611.1121.432029.450.042
COcold startoriginal1.554.16.152.373.215.38
deposits removed1.662.035.211.492.664.02
emissions reduction/%-7.150.4915.2837.1317.1325.2823.040.046
hot runningoriginal0.912.4850.61.582.54
deposits removed0.840.012.880.51.062.19
emissions reduction/%7.6999.642.416.6732.9113.7835.510.028
NOxcold startoriginal0.270.110.590.630.550.78
deposits removed0.510.110.450.590.50.86
emissions reduction/%-88.89023.736.359.09-10.26-10.000.893
hot runningoriginal0.430.040.40.40.430.48
deposits removed0.420.040.30.420.370.61
emissions reduction/%2.33025-513.95-27.081.530.893
Tab.4  Summary of pollutants emissions
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