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In-use emissions testing of diesel-driven buses in Southampton: is selective catalytic reduction as effective as fleet operators think?

Content Provider	IET Digital Library
Author	Sowman, Jonathan Box, Simon Wong, Alan Grote, Matt Laila, Dina S. Gillam, Gus Cruden, Andrew J. Preston, John M. Fussey, Peter
Abstract	Despite the continuously tightening emissions legislation, urban concentrations of nitrogen oxides (NO x ) remain at harmful levels. Road transport is responsible for a large fraction, wherein diesel engines are the principal culprits. Turbocharged diesel engines have long been preferred in heavy duty applications, due to their torque delivery and low fuel consumption. Fleet operators are under pressure to understand and control the emissions of their vehicles, yet the performance of emissions abatement technology in real-world driving is largely unquantified. The most popular NO x abatement technology for heavy duty diesel vehicles is selective catalytic reduction. In this work, the authors empirically determine the efficiency of a factory-fitted selective catalytic reduction (SCR) system in real-world driving by instrumenting passenger buses with both a portable emissions measurement system and a custom-built telematics unit to record key parameters from the vehicle diagnostics systems. They find that even in relatively favourable conditions, while there is some improvement due to the use of SCR, the vehicles operate far from the design emissions targets. The archival value of this study is in quantification of real world emissions versus design levels and the factors responsible for the discrepancy, as well as in examination of technologies to reduce this difference.
Starting Page	521
Ending Page	526
Page Count	6
ISSN	1751956X
Volume Number	12
e-ISSN	17519578
Issue Number	Issue 6, Aug (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-its/12/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-its.2017.0173
Journal	IET Intelligent Transport Systems
Publisher	The Institution of Engineering and Technology
Publisher Date	2018-02-07
Access Restriction	Open
Rights License	Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Subject Keyword	Compressors Control of Heat System Control of Other Power System Diesel Engines Diesel-driven Buses Emission Emission Legislation Engines Factory-fitted Selective Catalytic Reduction Fleet Operators Fuel System In-use Emission Testing Low Fuel Consumption Mechanical Variables Control Nitrogen Oxides SCR System Selective Catalytic Reduction Southampton Torque Control Torque Delivery Turbocharged Diesel Engines Under Pressure Urban Concentrations
Content Type	Text
Resource Type	Article
Subject	Law Transportation Environmental Science Mechanical Engineering

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In-use emissions testing of diesel-driven buses in Southampton: is selective catalytic reduction as effective as fleet operators think?

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In-use emissions testing of diesel-driven buses in Southampton: is selective catalytic reduction as effective as fleet operators think?