NOx Emissions from Euro 5 and Euro 6 Heavy-Duty Diesel Vehicles under Real Driving Conditions

Sangchul Ko, Junhong Park, Hyungjun Kim, Gunwoo Kang, Jongchul Lee, Jongmin Kim and Jongtae Lee
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Sangchul Ko: National Institute of Environmental Research (NIER), Incheon 22689, Korea
Junhong Park: National Institute of Environmental Research (NIER), Incheon 22689, Korea
Hyungjun Kim: National Institute of Environmental Research (NIER), Incheon 22689, Korea
Gunwoo Kang: National Institute of Environmental Research (NIER), Incheon 22689, Korea
Jongchul Lee: National Institute of Environmental Research (NIER), Incheon 22689, Korea
Jongmin Kim: National Institute of Environmental Research (NIER), Incheon 22689, Korea
Jongtae Lee: National Institute of Environmental Research (NIER), Incheon 22689, Korea

Energies, 2020, vol. 13, issue 1, 1-13

Abstract: Despite the strengthening of vehicle emissions standards and test methods, nitrogen oxide (NOx) emissions from on-road mobile sources are not being notably reduced. The introduction of real driving emission (RDE) regulations is expected to reduce the discrepancy between emission regulations and actual air pollution. To analyze the effects of RDE regulations on heavy-duty diesel vehicles, pollutants emitted while driving were measured using a portable emission measurement system (PEMS) for Euro 5 and Euro 6 vehicles, which were produced before and after RDE regulations, respectively. NOx emissions were compared as a function of emissions allowance standards, gross vehicle weight (GVW), average vehicle speed, and ambient temperature. NOx emissions from Euro 6 vehicles were found to be low, regardless of GVW; emissions from both vehicular categories increased with a decline in the average speed. To reflect real road driving characteristics more broadly in the RDE test method for heavy-duty vehicles, it is necessary to consider engine power, which is a criterion for classifying effective sections, in the moving average window (MAW) analysis method, as well as including cold start conditions.

Keywords: NOx; heavy-duty diesel vehicles; vehicle emissions standards; real driving emissions; in-service conformity; portable emission measurement system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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