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Influence of ambient temperature on cold-start emissions for a Euro 1 SI car using in-vehicle emissions measurement in an urban traffic jam test cycle

Andrews, Gordon E., Li, Hu, Wylie, James A., Zhu, G., Bell, Margaret and Tate, James (2005) Influence of ambient temperature on cold-start emissions for a Euro 1 SI car using in-vehicle emissions measurement in an urban traffic jam test cycle. In: General Emissions 2005. Society of Automotive Engineers , USA , pp. 133-154. ISBN 0-7680-1589-8

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Abstract

The influence of ambient temperature on exhaust emissions for an instrumented Euro 1 SI car was determined for urban congested traffic conditions. In UK cities cold-starting vehicles directly into congested traffic conditions is a common occurrence that is not currently taken into account when modeling urban traffic pollution. In-vehicle emission samples were taken directly from the exhaust, upstream and downstream of the catalyst, using the bag sampling technique. The first bag was for the cold start emissions and approximately the first 1.1 km of travel. The following three bags were with a hotter catalyst. The cold start tests were conducted over a year, with ambient temperatures ranging from 2°C to 30°C. The results showed that CO emissions for the cold start were reduced by 70% downstream of the catalyst when the ambient temperature rose from 2°C to 30°C. The corresponding hydrocarbon emissions were reduced by 41% and NOx emissions were increased by 90%. The influence of ambient temperature was less when the catalyst was fully warmed up. The results showed that ambient temperature had a greater influence on cold start emission under traffic jam conditions than in previous work with real world driving closer to the ECE passenger car drive cycle.

Item Type: Book Section
Copyright, Publisher and Additional Information: © 2005 SAE International. Published on this website with permission from SAE International. As a user of this website, you are permitted to view this paper on-line, download the .pdf file and print one copy of this papers at no cost for your use only. The downloaded .pdf file and printout of this SAE papers may not be copied, distributed or forwarded to others or for the use of others.
Keywords: cold start,emissions,urban traffic, ambient temperature
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Process, Environmental and Materials Engineering (Leeds) > Energy and Resources Research Institute (Leeds)
The University of Leeds > Faculty of Environment (Leeds) > Institute for Transport Studies (Leeds)
Depositing User: Hu Li
Date Deposited: 12 Mar 2007
Last Modified: 06 Jun 2014 07:53
Status: Published
Publisher: Society of Automotive Engineers
Refereed: Yes
Identification Number: SAE Paper # 2005-01-1617
URI: http://eprints.whiterose.ac.uk/id/eprint/2042

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