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Advanced Three-Way Converter System for High Temperature Exhaust Aftertreatment

Walker Manufacturing-Benny Snider, Sivanandi Rajadurai
Chrysler Corporation-Michael J. Brady, Ron Baker
Published 1997-02-24 by SAE International in United States
An advanced three-way converter system with significant improvements in light-off performance, conversion efficiency, thermal stability and physical durability at high operating temperature is described. The converter system is comprised of a light-weight ceramic substrate with high surface area triangular cell structure, a new catalyst formulation with enhanced thermal stability and good substrate compatibility, and a durable packaging design which together lead to consistent improvements in high temperature performance and durability.Experimental data including FTP performance, canning trials, and high temperature vibration and thermal shock tests for both the advanced and standard three-way converter systems are presented.THE TIGHTER emissions standards, and severe Federal Test Procedure over the entire cycle, combined with extended durability requirements are posing a considerable challenge to substrate manufacturers, washcoat and catalyst developers, and canners to come up with advanced converter systems capable of meeting both performance and durability requirements over a wide range of temperatures[1, 2, 3, 4, 5, 6, 7, 8, 9 and 10]. Although alternate approaches, including preconverter, electrically heated catalyst and in-line adsorber have demonstrated their feasibility for meeting theā€¦
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SAE and ISO Noise Test Site Variability

Walker Manufacturing-Kenneth G. Phaneuf
Ford Motor Co.-William J. Haley
Published 1995-05-01 by SAE International in United States
A Society of Automotive Engineers (SAE) Cooperative Research Project has established good correlation between pass-by noise data measured on U.S. test tracks conforming to SAE Sealed (sealed asphalt) and International Standards Organization (ISO) surface specifications. Although the ISO surface has a very specific track composition, it does not reduce the variability of the measurements over an SAE Sealed surface. This paper summarizes the project results and determines that the SAE Sealed surface generally produces slightly louder noise levels than a comparable ISO surface when used for pass-by testing; however, the SAE Sealed surface does not represent a consistent upper boundary for the ISO test data. The data supports the use of either track surface for pass-by procedures and suggests that road texture can influence the tire component of vehicle noise. Although the ISO surface has become the requirement for noise regulations in Europe, development work can be completed on the existing sealed test surfaces.
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