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Open AccessArticle

Characterization of Real-World Pollutant Emissions and Fuel Consumption of Heavy-Duty Diesel Trucks with Latest Emissions Control

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Department of Supply Chain Management, International Hellenic University, GR 60100 Katerini, Greece
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Department of Mechanical Engineering, Aristotle University of Thessaloniki, P.O. Box 483, GR 54124 Thessaloniki, Greece
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Emisia S.A., 21 Antoni Tritsi str., P.O. Box 8138, GR 57001 Thessaloniki, Greece
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Environmental Protection Department, Hong Kong SAR Government, Hong Kong, China
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(9), 535; https://doi.org/10.3390/atmos10090535
Received: 16 July 2019 / Revised: 16 August 2019 / Accepted: 6 September 2019 / Published: 10 September 2019
(This article belongs to the Special Issue Transport Emissions and the Atmosphere)
Heavy-duty diesel trucks (HDDTs) comprise a key source of road transport emissions and energy consumption worldwide mainly due to the growth of road freight traffic during the last two decades. Addressing their air pollutant and greenhouse gas emissions is therefore required, while accurate emission factors are needed to logistically optimize their operation. This study characterizes real-world emissions and fuel consumption (FC) of HDDTs and investigates the factors that affect their performance. Twenty-two diesel-fueled, Euro IV to Euro VI, HDDTs of six different manufacturers were measured in the road network of the Hong Kong metropolitan area, using portable emission measurement systems (PEMS). The testing routes included urban, highway and mixed urban/highway driving. The data collected corresponds to a wide range of driving, operating, and ambient conditions. Real-world distance- and energy-based emission levels are presented in a comparative manner to capture the effect of after-treatment technologies and the role of the evolution of Euro standards on emissions performance. The emission factors’ uncertainty is analyzed. The impact of speed, road grade and vehicle weight loading on FC and emissions is investigated. An analysis of diesel particulate filter (DPF) regenerations and ammonia (NH3) slip events are presented along with the study of Nitrous oxide (N2O) formation. The results reveal deviations of real-world HDDTs emissions from emission limits, as well as the significant impact of different operating and driving factors on their performance. The occasional high levels of N2O emissions from selective catalytic reduction equipped HDDTs is also revealed, an issue that has not been thoroughly considered so far. View Full-Text
Keywords: heavy-duty diesel truck (HDDT); portable emission measurement system (PEMS); emission factor; fuel consumption; after-treatment technology; Euro standard heavy-duty diesel truck (HDDT); portable emission measurement system (PEMS); emission factor; fuel consumption; after-treatment technology; Euro standard
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Keramydas, C.; Ntziachristos, L.; Tziourtzioumis, C.; Papadopoulos, G.; Lo, T.-S.; Ng, K.-L.; Wong, H.-L.A.; Wong, C. .-L. Characterization of Real-World Pollutant Emissions and Fuel Consumption of Heavy-Duty Diesel Trucks with Latest Emissions Control. Atmosphere 2019, 10, 535.

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