Article: Identification of high-emitting catalyst cars on the road by means of remote sensing Journal: International Journal of Vehicle Design (IJVD) 1997 Vol.18 No.3/4 pp.326 - 339 Abstract: Repeated remote sensing measurements were carried out at a site outside Stockholm, Sweden, in 1995, to investigate the ability of a remote sensor to identify catalyst cars on the road with excess emissions. Ten catalyst cars were selected from the measurements for a chassis dynamometer and service/repair study. The results show that average remote sensor CO readings based on repeat measurements can be used to fairly accurately predict CO and HC emissions, but not NOx emissions, from catalyst cars over a full driving cycle. Furthermore, it was demonstrated that low-cost service and repair of high-emitting catalyst cars may reduce CO and HC emissions by more than 90% and fuel consumption by up to 20%, whereas NOx emissions tended to increase. The study indicates that the fraction of catalyst cars with excess FTP emissions in Sweden in 1995 was about 10% as regards CO and about 3% as regards HC, and that the |super-emitter| fraction was about 0.5%. Despite the small fractions, these categories may account for a significant share of catalyst cars| overall CO and HC emissions. Inderscience Publishers - linking academia, business and industry through research

Title: Identification of high-emitting catalyst cars on the road by means of remote sensing

Authors: A. Sjodin, K. Andreasson, M. Wallin, M. Lenner, H. Wilhemsson

Addresses: Swedish Environmental Research Institute, Box 47086, S-402 58 Goteborg, Sweden. ' Swedish Environmental Research Institute, Box 47086, S-402 58 Goteborg, Sweden. ' Swedish Motor Vehicle Inspection Company, Box 223, S-136 23 Haninge, Sweden. ' Swedish Road and Transport Research Institute, S-581 95 Linkoping, Sweden. ' Swedish Road and Transport Research Institute, S-581 95 Linkoping, Sweden

Abstract: Repeated remote sensing measurements were carried out at a site outside Stockholm, Sweden, in 1995, to investigate the ability of a remote sensor to identify catalyst cars on the road with excess emissions. Ten catalyst cars were selected from the measurements for a chassis dynamometer and service/repair study. The results show that average remote sensor CO readings based on repeat measurements can be used to fairly accurately predict CO and HC emissions, but not NOx emissions, from catalyst cars over a full driving cycle. Furthermore, it was demonstrated that low-cost service and repair of high-emitting catalyst cars may reduce CO and HC emissions by more than 90% and fuel consumption by up to 20%, whereas NOx emissions tended to increase. The study indicates that the fraction of catalyst cars with excess FTP emissions in Sweden in 1995 was about 10% as regards CO and about 3% as regards HC, and that the |super-emitter| fraction was about 0.5%. Despite the small fractions, these categories may account for a significant share of catalyst cars| overall CO and HC emissions.

Keywords: catalyst cars; chassis dynamometer; carbon monoxide; fuel economy; hydrocarbons; nitrogen oxides; polluters; remote sensing; Sweden; air pollution; vehicle emissions; exhaust emissions.

DOI: 10.1504/IJVD.1997.062057

International Journal of Vehicle Design, 1997 Vol.18 No.3/4, pp.326 - 339

Published online: 29 May 2014 *

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Title: Identification of high-emitting catalyst cars on the road by means of remote sensing

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