Variability in operation-based NOx emission factors with different test routes, and its effects on the real-driving emissions of light diesel vehicles

Lee, Taewoo; Park, Junhong; Kwon, Sangil; Lee, Jong-Tae; Kim, Jeongsoo

doi:10.1016/j.scitotenv.2013.05.015

Cited by 72 publications

(38 citation statements)

References 20 publications

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“…This is when the flame temperature is the highest. Increasing the temperature of combustion increases the amount of NO x by as much as threefold for every 100°C increase (Lee et al 2013;Bosch 2005).…”

Section: Nitrogen Oxides (No X )mentioning

confidence: 99%

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The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

Reşi̇toğlu

Altınışık

Keskïn

2014

Clean Techn Environ Policy

776

353

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Diesel engines have high efficiency, durability, and reliability together with their low-operating cost. These important features make them the most preferred engines especially for heavy-duty vehicles. The interest in diesel engines has risen substantially day by day. In addition to the widespread use of these engines with many advantages, they play an important role in environmental pollution problems worldwide. Diesel engines are considered as one of the largest contributors to environmental pollution caused by exhaust emissions, and they are responsible for several health problems as well. Many policies have been imposed worldwide in recent years to reduce negative effects of diesel engine emissions on human health and environment. Many researches have been carried out on both diesel exhaust pollutant emissions and aftertreatment emission control technologies. In this paper, the emissions from diesel engines and their control systems are reviewed. The four main pollutant emissions from diesel engines (carbon monoxide-CO, hydrocarbons-HC, particulate matter-PM and nitrogen oxides-NO x ) and control systems for these emissions (diesel oxidation catalyst, diesel particulate filter and selective catalytic reduction) are discussed. Each type of emissions and control systems is comprehensively examined. At the same time, the legal restrictions on exhaust-gas emissions around the world and the effects of exhaust-gas emissions on human health and environment are explained in this study.

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Section: Nitrogen Oxides (No X )mentioning

confidence: 99%

“…Compared with gasoline engines, they need higher temperatures because they are compression-ignition engines. Diesel engines are responsible for about 85 % of all the NO x emissions from mobile sources, primarily in the form of NO (Lee et al 2013;Wang et al 2012).…”

Section: Nitrogen Oxides (No X )mentioning

confidence: 99%

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

Reşi̇toğlu

Altınışık

Keskïn

2014

Clean Techn Environ Policy

776

353

View full text Add to dashboard Cite

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“…This is particularly true for the road transport sector (Lee et al, 2013;Simmons and Seakins., 2012;Liu et al, 2009;Grice et al, 2009) which often constitutes the single most important source of NO x emissions in urban environments. In addition, urban scale inventories usually need a fine spatial and temporal resolution, which cannot be achieved by downscaling methods or top-down inventories.…”

Section: Introductionmentioning

confidence: 99%

Emission inventories and modeling requirements for the development of air quality plans. Application to Madrid (Spain)

Borge

Lumbreras

Pérez

et al. 2014

Science of The Total Environment

126

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HIGHLIGHTS• A comprehensive and flexible urban emission inventory was developed for Madrid.• Options for multi-scale consistency are discussed (from European to street level).• Urban background N0 2 concentration levels well described by CMAQ (MB -2.2 ug/m 3 ).• N0 2 concentration levels in Madrid are dominated by local traffic (up to 90%).• A 31% reduction of NO x emissions may allow Madrid meeting the N0 2 European standards. ABSTRACTModeling is an essential tool for the development of atmospheric emission abatement measures and air quality plans. Most often these plans are related to urban environments with high emission density and population exposure. However, air quality modeling in urban areas is a rather challenging task. As environmental standards become more stringent (e.g. European Directive 2008/50/EC), more reliable and sophisticated modeling tools are needed to simulate measures and plans that may effectively tackle air quality exceedances, common in large urban areas across Europe, particularly for N0 2 . This also implies that emission inventories must satisfy a number of conditions such as consistency across the spatial scales involved in the analysis, consistency with the emission inventories used for regulatory purposes and versatility to match the requirements of different air quality and emission projection models. This study reports the modeling activities carried out in Madrid (Spain) highlighting the atmospheric emission inventory development and preparation as an illustrative example of the combination of models and data needed to develop a consistent air quality plan at urban level. These included a series of source apportionment studies to define contributions from the international, national, regional and local sources in order to understand to what extent local authorities can enforce meaningful abatement measures. Moreover, source apportionment studies were conducted in order to define contributions from different sectors and to understand the maximum feasible air quality improvement that can be achieved by reducing emissions from those sectors, thus targeting emission reduction policies to the most relevant activities. Finally, an emission scenario reflecting the effect of such policies was developed and the associated air quality was modeled.

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“…Because of their harmfulness, NOx emissions are the most persecuted emissions from diesel vehicles [25]. As suggested in Figure 5, NOx emissions in real driving conditions are mainly consequence of abrupt vehicle accelerations, even they occur at low average speed conditions.…”

Section: Influence Of the Calculation Methods On The Nox Conformity Famentioning

confidence: 99%

An assessment of the real-world driving gaseous emissions from a Euro 6 light-duty diesel vehicle using a portable emissions measurement system (PEMS)

Luján

Bermúdez

Dolz

et al. 2018

Atmospheric Environment

112

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Luján, JM.; Bermúdez, V.; Dolz, V.; Monsalve-Serrano, J. (2018). An assessment of the realworld driving gaseous emissions from a Euro 6 light-duty diesel vehicle using a portable emissions measurement system (PEMS). Atmospheric Environment. 174:112-121. AbstractRecent investigations demonstrated that real-world emissions usually exceed the levels achieved in the laboratory based type approval processes. By means of on-board emissions measurements, it has been shown that nitrogen oxides emitted by diesel engines substantially exceed the limit imposed by the Euro 6 regulation. Thus, with the aim of complementing the worldwide harmonized light vehicles test cycle, the real driving emissions cycle will be introduced after 1 September 2017 to regulate the vehicle emissions in real-world driving situations. This paper presents on-board gaseous emissions measurements from a Euro 6 light-duty diesel vehicle in a real-world driving route using a portable emissions measurement system. The test route characteristics follow the requirements imposed by the RDE regulation. The analysis of the raw emissions results suggests that the greatest amount of nitrogen oxides and nitrogen dioxide are emitted during the urban section of the test route, confirming that lower speeds with more accelerations and decelerations lead to higher nitrogen oxides emissions levels than constant high speeds. Moreover, the comparison of the two calculation methods proposed by the real driving emissions regulation has revealed emissions rates differences ranging from 10% to 45% depending on the pollutant emission and the trip section considered (urban or total). Thus, the nitrogen oxides emissions conformity factor slightly varies from one method to the other.

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Variability in operation-based NOx emission factors with different test routes, and its effects on the real-driving emissions of light diesel vehicles

Cited by 72 publications

References 20 publications

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems

Emission inventories and modeling requirements for the development of air quality plans. Application to Madrid (Spain)

An assessment of the real-world driving gaseous emissions from a Euro 6 light-duty diesel vehicle using a portable emissions measurement system (PEMS)

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