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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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          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.

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          Most cited references 8

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          New insights from comprehensive on-road measurements of NOx, NO2 and NH3 from vehicle emission remote sensing in London, UK

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            Reaction Pathways in the Selective Catalytic Reduction Process with NO and NO2at Low Temperatures

             M. Koebel,  G Madia,  M Elsener (2001)
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              Modelling of an SCR catalytic converter for diesel exhaust after treatment: Dynamic effects at low temperature

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                Author and article information

                Contributors
                Journal
                IET-ITS
                IET Intelligent Transport Systems
                IET Intell. Transp. Syst.
                The Institution of Engineering and Technology
                1751-956X
                1751-9578
                7 February 2018
                2 March 2018
                August 2018
                : 12
                : 6
                : 521-526
                Affiliations
                [1 ] Energy Technology Group, Faculty of Engineering and the Environment, University of Southampton , Southampton SO17 1BJ, UK
                [2 ] Transportation Research Group, Faculty of Engineering and the Environment, University of Southampton , Southampton SO17 1BJ, UK
                [3 ] School of Mechanical, Aerospace and Automotive Engineering, Coventry University , Coventry CV1 2TL, UK
                [4 ] Engine Control and Calibration, Ricardo Ltd , Shoreham-by-Sea, West Sussex BN43 5FG, UK
                Article
                IET-ITS.2017.0173 ITS.2017.0173.R1
                10.1049/iet-its.2017.0173

                This is an open access article published by the IET under the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/3.0/)

                Page count
                Pages: 0
                Product
                Funding
                Funded by: Department for Transport
                Funded by: Royal Society
                Award ID: RG140095
                Funded by: Engineering and Physical Sciences Research Council
                Award ID: EP/G036896/1
                Funded by: Southampton City Council
                Categories
                Research Article

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