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Influence of ambient temperature on cold start emissions for EURO1 SI car using in-vehicle emissions measurement in an urban traffic jam test cycle

Lookup NU author(s): Professor Margaret Carol Bell CBE


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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 modelling 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\mDC to 30\mDC. 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\mDC to 30\mDC. 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.

Publication metadata

Author(s): Andrews GE, Li H, Wylie JA, Zhu G, Bell MC, Tate JE

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: SAE World Congress and Exhibition

Year of Conference: 2005

Pages: 133-154

Publisher: SAE


Notes: SAE Book SP-1944 Paper reference: 2005-01-1617

Library holdings: Search Newcastle University Library for this item

Series Title: SAE Technical Paper Series

ISBN: 0768015898