4.7 Article

A Vehicle Activity-based Windowing approach to evaluate real-world NOx emissions from Modern Heavy-duty Diesel Trucks

Journal

ATMOSPHERIC ENVIRONMENT
Volume 247, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2020.118169

Keywords

Heavy-duty diesel trucks; Selective catalytic reduction; NOx emissions; Not-to-exceed (NTE); Portable emissions measurement system (PEMS)

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The paper introduces an alternative Vehicle Activity-based Windowing (ABW) approach to evaluate in-use NOx emissions rates by segregating engine and aftertreatment dependent modes of operating conditions. Results show that the ABW approach allows for utilizing over 90% of test activity, providing a comparison of NOx emissions levels between low and medium/high power engine operation conditions.
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.

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