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.
Highlights
Emission allowance standards and test methods for vehicles are continuously being strengthened to reduce the air pollutants emitted from diesel vehicles [1]
Low temperatures were found to have no Category M3 significant effect on nitrogen oxide (NOx) emissions because most heavy-duty diesel vehicles (HDVs) have insulated exhaust pipes; the temperature of the exhaust gas did not fall below the activation temperature of the catalyst under the
The number of test vehicles cannot be used as a representative value as there are very few test vehicles, and only Euro 6 vehicles are considered
Summary
Emission allowance standards and test methods for vehicles are continuously being strengthened to reduce the air pollutants emitted from diesel vehicles [1]. The Euro 6 standards have tightened the limits for particulate matter and nitrogen oxide (NOx) by approximately 90% from the Euro 3 standards; they have not contributed to the improvement of air pollution in large cities as much as expected. The PM10 concentration in Seoul has been continuously decreasing since 2001, but the NO2 concentration has not shown a clear reducing trend [3]. The Joint Research Centre of the European Commission has identified problems with NOx emissions of diesel vehicles produced under European regulations, being 4 to 7 times higher than the indoor certification standards [4]. It is important to resolve the discrepancy between these emission regulations and actual air pollution [3,4,5]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
