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

In-use emissions testing of diesel-driven buses in Southampton: Is selective catalytic reduction as effective as fleet operators think?
In-use emissions testing of diesel-driven buses in Southampton: Is selective catalytic reduction as effective as fleet operators think?
Despite the continuously tightening emissions legislation, urban concentrations of nitrogen oxides (NOx) 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 NOx abatement technology for heavy duty diesel vehicles is selective catalytic reduction. In this work, we empirically determine the efficiency of a factory-fitted SCR system in realworld driving by instrumenting passenger buses with both a portable emissions measurement system (PEMS) and a custom built telematics unit to record key parameters from the vehicle diagnostics systems. Wefindthateveninrelativelyfavourableconditions, 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 paper 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.
1751-956X
521-526
Sowman, Jonathan
2614b117-1ef8-4082-acdb-fa428239757c
Box, Simon
2bc3f3c9-514a-41b8-bd55-a8b34fd11113
Wong, Alan
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Grote, Matthew
f29566f9-42a7-498a-9671-8661a4287754
Laila, Dina Shona
41aa5cf9-3ec2-4fdf-970d-a0a349bfd90c
Gillam, Neil Gordon
74d977b0-53a1-47c1-a1ae-03a99d446576
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Preston, Jonathan
ef81c42e-c896-4768-92d1-052662037f0b
Fussey, Peter
7f0d2025-fb87-4750-bb6a-a7c64e4d5009
Sowman, Jonathan
2614b117-1ef8-4082-acdb-fa428239757c
Box, Simon
2bc3f3c9-514a-41b8-bd55-a8b34fd11113
Wong, Alan
5f0c96fb-605f-4c3d-a50d-3f07e6e7c8f2
Grote, Matthew
f29566f9-42a7-498a-9671-8661a4287754
Laila, Dina Shona
41aa5cf9-3ec2-4fdf-970d-a0a349bfd90c
Gillam, Neil Gordon
74d977b0-53a1-47c1-a1ae-03a99d446576
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Preston, Jonathan
ef81c42e-c896-4768-92d1-052662037f0b
Fussey, Peter
7f0d2025-fb87-4750-bb6a-a7c64e4d5009

Sowman, Jonathan, Box, Simon, Wong, Alan, Grote, Matthew, Laila, Dina Shona, Gillam, Neil Gordon, Cruden, Andrew, Preston, Jonathan and Fussey, Peter (2018) In-use emissions testing of diesel-driven buses in Southampton: Is selective catalytic reduction as effective as fleet operators think? IET Intelligent Transport Systems, 12 (6), 521-526. (doi:10.1049/iet-its.2017.0173).

Record type: Article

Abstract

Despite the continuously tightening emissions legislation, urban concentrations of nitrogen oxides (NOx) 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 NOx abatement technology for heavy duty diesel vehicles is selective catalytic reduction. In this work, we empirically determine the efficiency of a factory-fitted SCR system in realworld driving by instrumenting passenger buses with both a portable emissions measurement system (PEMS) and a custom built telematics unit to record key parameters from the vehicle diagnostics systems. Wefindthateveninrelativelyfavourableconditions, 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 paper 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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In-Use Emissions Testing_040118 - Accepted Manuscript
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Accepted/In Press date: 29 January 2018
e-pub ahead of print date: 5 July 2018
Published date: 1 August 2018

Identifiers

Local EPrints ID: 417770
URI: http://eprints.soton.ac.uk/id/eprint/417770
ISSN: 1751-956X
PURE UUID: deaffd8b-827c-41d7-8bfd-791e6d5d3ac7
ORCID for Andrew Cruden: ORCID iD orcid.org/0000-0003-3236-2535
ORCID for Jonathan Preston: ORCID iD orcid.org/0000-0002-6866-049X

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Date deposited: 13 Feb 2018 17:30
Last modified: 30 Jan 2020 05:09

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Contributors

Author: Jonathan Sowman
Author: Simon Box
Author: Alan Wong
Author: Matthew Grote
Author: Dina Shona Laila
Author: Neil Gordon Gillam
Author: Andrew Cruden ORCID iD
Author: Peter Fussey

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