Li, H, Andrews, GE, Zhu, G et al. (4 more authors) (2005) Impact of Ambient Temperatures on Exhaust Thermal Characteristics during Cold Start for Real World SI Car Urban Driving Tests. In: Engineers, SOA, (ed.) SAE Proceedings: Powertrain and Fluid Systems Conference and Exhibition. SAE Proceedings: Powertrain and Fluid Systems Conference and Exhibition, 03-06 Oct 2005 Society of Automotive Engineers , USA ISBN 0-7680-1652-5
Abstract
Thermal characteristics of SI engine exhaust during cold start and warm up period were investigated for different ambient temperatures (-2 to 32 °C). A Euro 1 emission compliance SI car was tested using a real world urban driving cycle to represent typical city driving patterns and simulate ECE15 urban driving cycle. The test car was equipped with 27 thermocouples along the engine and exhaust pipes so as to measure metal and exhaust gas temperatures along the engine, exhaust and catalyst. The characteristics of thermal properties of engine, exhaust system and catalyst were studied as a function of warm up time and ambient temperature. The temperature and time of the light-off of catalyst were investigated so as to evaluate the effect of thermal properties of the catalyst on emissions. The results show that the coolant water reached the full warm up about 5 minutes in summer and 9 minutes in winter after a cold start. Lubricating oil reached the full warm up in 10 minutes in summer and 14 minutes in winter after a cold start. The light-off time of TWC was about 3 minutes in summer and 6 minutes in winter in terms of catalyst substrate temperatures. The determination of catalyst light off has been studied and discussed in terms of catalyst substrate temperatures and gas temperatures. The ambient temperature had little influence on engine out exhaust gas temperatures. The heat loss from the engine out to the catalyst was at highest level in the first 5~6 minutes and after this point the heat available at the catalyst was relatively stable. The thermal properties of the engine and exhaust system had significant influence on emissions. The results indicate that in some urban driving conditions such as short journeys in cities especially under cold weather conditions, the function of catalysts for emission reductions is very limited.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Editors: |
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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: | emissions; cold start; urban driving; exhaust |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Energy Research Institute (Leeds) |
Depositing User: | Hu Li |
Date Deposited: | 12 Mar 2007 |
Last Modified: | 20 Feb 2024 14:59 |
Published Version: | http://www.sae.org/technical/papers/2005-01-3896 |
Status: | Published |
Publisher: | Society of Automotive Engineers |
Refereed: | Yes |
Identification Number: | 10.4271/2005-01-3896 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:2041 |