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Optimisation Development of Advanced Exhaust Gas After-treatment Systems for Automotive Applications
Technical Paper
2005-01-2157
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Future emission legislation can be met through substantial improvement in the effectiveness of the exhaust gas after-treatment system, the engine and the engine management system. For the catalytic converter, differentiation is necessary between the cold start behavior and the effectiveness at operating temperature. To be catalytically effective, a converter must be heated by the exhaust gas up to its light-off temperature. The major influential parameter for the light-off still is the supply of heat from the exhaust gas. Modification of the cold start calibration of engine control such as spark retard or increased idle speed can increase the temperature level of the exhaust gas. One further possibility is represented by a reduction of the critical mass ahead of the catalyst (exhaust manifold and pipe). Nevertheless the best measure to obtain optimal cold start effectiveness still seems to be locating the converter close to the engine. Depending on the individual application, limited installation space may only be available. Therefore the design target is a low volume, high effective catalyst with optimized thermodynamic properties to obtain maximum advantage of the thermal energy coming from the exhaust gases. The present paper deals with the cold start of a generic test cycle that can be subdivided in different phases, each characterized by different design parameters of the converter that are to be specifically tailored in order to achieve the maximum possible overall efficiency for the whole test.
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Citation
Presti, M. and Pace, L., "Optimisation Development of Advanced Exhaust Gas After-treatment Systems for Automotive Applications," SAE Technical Paper 2005-01-2157, 2005, https://doi.org/10.4271/2005-01-2157.Also In
References
- Brück, R. Diewald R. Hirth P. Kaiser F.-W. “Design Criteria for Metallic Substrates for Catalytic Converters” SAE Paper 950789 1995
- Gottberg, I. “Principles of the heterogenous Catalysis as in the example of the 3-way Catalytic Converter for SI-Engines” Congress „Future Emission Legislation in Europe and USA” Haus der Technik Essen 1996
- Leveroni, E. Saroglia, G. Rossi, R. „Catalyst Concepts for Small Volume SI-Engines: The Example of the 1.2 L Punto” Congress „Future Emission Legislation in Europe and USA” Haus der Technik Essen 1996
- Brück, R. Maus, W. „Motornahe Katalysatorkonzepte; Neue technische Herausforderungen” 18 Internationales Motorensymposium Wien 1997
- Pfalzgraf, B. Rieger, M. Ottowitz, G. “Close-coupled Catalytic Converters for Compliance with LEV/ULEV and EG III-Legislation - Influence of Support Material, Cell Density and Mass on Emission Results” SAE-Paper 960261 1996
- “New Potential Exhaust Gas Aftertreatment Technologies for “Clean Car” Legislation” Gottberg, I. Rydquist, J.E. Backlund, O. Wallman, S. Volvo Car Corporation Maus, W. Brück, R. Swars, H. Emitec GmbH SAE-Paper 910840
- Kaiser, F.-W. Pelters S. “Comparison of Metal Supported Catalysts with Different Cell Geometries” SAE Paper 910837 1991