Title: Regulated and unregulated exhaust emissions from in-use catalyst cars at normal and low ambient temperatures

Authors: Juhani Laurikko

Addresses: VTT Energy, Engine Technology, P.O. Box 1601, FIN-02044 VU, Finland

Abstract: This paper presents and discusses test results obtained from a fleet of 44 current-technology passenger cars typical of European vehicles and employs three-way catalyst system with closed-loop air-fuel ratio control. The tested vehicles represented 15 different types and had been in normal use for one to four years and their odometer readings ranged from about 10 000 to over 80 000 km. Tests were performed at normal (+22°C) as well as at low (-7°C) ambient temperatures using the US FTP75 test procedure. Normal CVS-system was used for exhaust sampling and analysis, but a continuous sampling with second-by-second analysis has also been performed in some tests. In addition to the regulated emissions (CO, HC and NOx), some nonregulated compounds have also been measured using the latest high-speed on-line FTIR analysis equipment. Test results and discussion outlines the response of individual vehicles and their emission control equipment to low ambient temperatures. Unit emissions (g/km) are presented for the regulated and cumulative (in g[test] values for some nonregulated compounds (N20 and NH3).

Keywords: catalyst cars; exhaust pollutants; low ambient temperatures; specific emissions.

DOI: 10.1504/IJVD.1998.001828

International Journal of Vehicle Design, 1998 Vol.20 No.1/2/3/4, pp.159-171

Published online: 14 Dec 2003 *

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