Real Driving NOx Emissions from Euro VI Diesel Buses

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

Abstract

Since 2013, Euro VI heavy-duty on-road vehicles have been on the market in the Europe. Regulated exhaust emissions, including nitrogen oxides and particulate matter, have been cut down to a very low level, independent of fuel (diesel or natural gas). Multiple research papers have shown that the regulated emissions from the Euro VI and US 2010 heavy-duty on-road vehicles tested on chassis dynamometers really deliver emission levels which correspond the type approval requirements, independent of the test cycle used. In-service conformity (ISC), which is included in the Euro VI legislation, requires heavy-duty on-road engine manufacturers to test and prove their engines to comply with the emission legislation during the engine in-use period. The measurements are carried out in the field using PEMS (Portable Emission Measurement System) equipment. This kind of testing, depicting real-world emissions is the final stage to confirm low real-life emissions. Although there is evidence that the exhaust aftertreatment systems of Euro VI heavy-duty on-road engines work well on an average, there is only a limited data of city buses covering their functionality over longer operation periods, especially not at lower ambient temperatures. Especially reduction of nitrogen oxides in the SCR-system (Selective Catalytic Reduction) is sensitive to SCR catalyst operation temperature, and also to impurities transferred from engine oil or fuel. This paper present results of a unique combination of chassis dynamometer measurements, on-road PEMS measurements and continuous NOx-emission monitoring during operation in winter condition from four Euro VI diesel city buses operating in the Helsinki metropolitan area. Based on the research done, four Euro VI city buses monitored and measured during the project showed decreased NOx conversion rate and increased tailpipe NOx emissions when operating in ambient temperatures below 0 °C. Especially in ambient temperatures below -10 °C, the continuous monitoring showed dramatically increased tailpipe NOx concentrations.

Original languageEnglish
Article number2018-01-1815
JournalSAE Technical Paper Series
Volume2018
DOIs
Publication statusPublished - 2018
MoE publication typeA4 Article in a conference publication
EventSAE 2018 International Powertrains, Fuels and Lubricants Meeting, FFL 2018 - Heidelberg, Germany
Duration: 17 Sep 201819 Sep 2018

Fingerprint

Engines
Dynamometers
Chassis
Nitrogen oxides
Thyristors
Temperature
Selective catalytic reduction
Monitoring
Diesel fuels
Diesel engines
Natural gas
Impurities
Catalysts
Testing

Cite this

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title = "Real Driving NOx Emissions from Euro VI Diesel Buses",
abstract = "Since 2013, Euro VI heavy-duty on-road vehicles have been on the market in the Europe. Regulated exhaust emissions, including nitrogen oxides and particulate matter, have been cut down to a very low level, independent of fuel (diesel or natural gas). Multiple research papers have shown that the regulated emissions from the Euro VI and US 2010 heavy-duty on-road vehicles tested on chassis dynamometers really deliver emission levels which correspond the type approval requirements, independent of the test cycle used. In-service conformity (ISC), which is included in the Euro VI legislation, requires heavy-duty on-road engine manufacturers to test and prove their engines to comply with the emission legislation during the engine in-use period. The measurements are carried out in the field using PEMS (Portable Emission Measurement System) equipment. This kind of testing, depicting real-world emissions is the final stage to confirm low real-life emissions. Although there is evidence that the exhaust aftertreatment systems of Euro VI heavy-duty on-road engines work well on an average, there is only a limited data of city buses covering their functionality over longer operation periods, especially not at lower ambient temperatures. Especially reduction of nitrogen oxides in the SCR-system (Selective Catalytic Reduction) is sensitive to SCR catalyst operation temperature, and also to impurities transferred from engine oil or fuel. This paper present results of a unique combination of chassis dynamometer measurements, on-road PEMS measurements and continuous NOx-emission monitoring during operation in winter condition from four Euro VI diesel city buses operating in the Helsinki metropolitan area. Based on the research done, four Euro VI city buses monitored and measured during the project showed decreased NOx conversion rate and increased tailpipe NOx emissions when operating in ambient temperatures below 0 °C. Especially in ambient temperatures below -10 °C, the continuous monitoring showed dramatically increased tailpipe NOx concentrations.",
author = "Petri S{\"o}derena and Nylund, {Nils Olof} and Rasmus Pettinen and Reijo M{\"a}kinen",
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language = "English",
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Real Driving NOx Emissions from Euro VI Diesel Buses. / Söderena, Petri; Nylund, Nils Olof; Pettinen, Rasmus; Mäkinen, Reijo.

In: SAE Technical Paper Series, Vol. 2018, 2018-01-1815, 2018.

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

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AU - Söderena, Petri

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JO - SAE Technical Paper Series

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