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A Vehicle Activity-based Windowing approach to evaluate real-world NOx emissions from Modern Heavy-duty Diesel Trucks
Abstract The Not-to-Exceed (NTE) protocol developed in 2004 is currently used for verification of emissions compliance during in-fleet operation. However, the NTE protocol has come under scrutiny for assessment of test activity only under specific modes of in-use operation (i.e., favorable to NOx reduction aftertreatment system), therefore resulting in a limited amount of in-use activity being utilized for evaluation of the engine's compliance. This paper presents the application of an alternative concept, i.e., Vehicle Activity-based Windowing (ABW) approach to assess in-use NOx emissions rates while segregating engine and aftertreatment dependent modes of operating conditions. To this aim, in-use gaseous emissions were measured using a portable emissions measurement system (PEMS) from four modern heavy-duty (HD) trucks that were operated along four distinctive routes in Southern California. All the four trucks were equipped with diesel-fueled engines certified to the United States Environmental Protection Agency (U.S. EPA) 2010 emissions standards and were equipped with a diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and selective catalytic reduction (SCR) aftertreatment configuration. Results of the study indicate that the ABW approach provides a unique opportunity of utilizing more than 90% of test activity acquired from valid ABW trips while demonstrating a characteristic comparison of NOx emissions levels from low versus medium/high power engine operation that are within as well as outside the bounds of efficient SCR operating conditions.
Highlights Gaseous emissions were measured from vocational duty cycles in Southern California. An event-based platform was developed to characterize tailpipe NOx emission rates. NOx emissions were within NTE limit only under certain modes of operating conditions.
A Vehicle Activity-based Windowing approach to evaluate real-world NOx emissions from Modern Heavy-duty Diesel Trucks
Abstract The Not-to-Exceed (NTE) protocol developed in 2004 is currently used for verification of emissions compliance during in-fleet operation. However, the NTE protocol has come under scrutiny for assessment of test activity only under specific modes of in-use operation (i.e., favorable to NOx reduction aftertreatment system), therefore resulting in a limited amount of in-use activity being utilized for evaluation of the engine's compliance. This paper presents the application of an alternative concept, i.e., Vehicle Activity-based Windowing (ABW) approach to assess in-use NOx emissions rates while segregating engine and aftertreatment dependent modes of operating conditions. To this aim, in-use gaseous emissions were measured using a portable emissions measurement system (PEMS) from four modern heavy-duty (HD) trucks that were operated along four distinctive routes in Southern California. All the four trucks were equipped with diesel-fueled engines certified to the United States Environmental Protection Agency (U.S. EPA) 2010 emissions standards and were equipped with a diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and selective catalytic reduction (SCR) aftertreatment configuration. Results of the study indicate that the ABW approach provides a unique opportunity of utilizing more than 90% of test activity acquired from valid ABW trips while demonstrating a characteristic comparison of NOx emissions levels from low versus medium/high power engine operation that are within as well as outside the bounds of efficient SCR operating conditions.
Highlights Gaseous emissions were measured from vocational duty cycles in Southern California. An event-based platform was developed to characterize tailpipe NOx emission rates. NOx emissions were within NTE limit only under certain modes of operating conditions.
A Vehicle Activity-based Windowing approach to evaluate real-world NOx emissions from Modern Heavy-duty Diesel Trucks
Pondicherry, Rasik (author) / Besch, Marc C. (author) / Thiruvengadam, Arvind (author) / Carder, Daniel (author)
Atmospheric Environment ; 247
2020-12-22
Article (Journal)
Electronic Resource
English
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