SAE #: 2009-01-1072 | View PDF

SAE Paper 2009-01-1072(c) 2006 SAE International. This paper is posted on this website with permission from SAE International. This SAE paper is for viewing only, and may not be printed, copied, distributed or forwarded to others, or used by others.

AUTHORS:
Jonathan D. Pesansky, Nathan A. Majiros, Charles M. Sorensen and David L. Thomas - Corning Incorporated

ABSTRACT:
The objective of this paper is to provide an estimate of the potential effect of substrate and exhaust system backpressure on engine performance. Parameters
include fuel consumption, CO2 emissions, and horsepower. Results were obtained on an engine test stand, and statistical analysis was used to understand
the relationships between variables. Tradeoffs between catalyst substrate selection and engine performance for the particular engine used in this study are described.
Finally, the potential impact of exhaust system backpressure on real world driving conditions is discussed.

SAE #: 2008-01-0808 | View PDF

SAE Paper 2008-01-0808(c) 2006 SAE International. This paper is posted on this website with permission from SAE International. This SAE paper is for viewing only, and may not be printed, copied, distributed or forwarded to others, or used by others.

AUTHORS:
Susan C. Lauderdale, Seth T. Nickerson, Jonathan D. Pesansky and Charles M. Sorensen - Corning Incorporated

ABSTRACT:
The effect of web thickness on emission performance, pressure drop, and mechanical properties was investigated for a series of catalyzed ceramic monolith substrates having cell densities of 900, 600 and 400 cpsi. As expected, thinner webs provide better catalyst light off performance and lower pressure drop, but mechanical strength generally decreases as web thickness is reduced. Good correlations were found between emission performance and geometric parameters based on bare and coated parts. An improved method for estimating the effects of cell density and web thickness on bare substrate strength is described, and the effect of porosity on material strength is also examined. New mechanical strength correlations for ceramic honeycombs are presented. The availability of a range of ceramic product geometries provides options for gasoline exhaust emission design and optimization, especially where increased levels of performance are desired.

SAE #: 2005-01-1118 | View PDF

SAE Paper 2005-01-1118(c) 2006 SAE International. This paper is posted on this website with permission from SAE International. This SAE paper is for viewing only, and may not be printed, copied, distributed or forwarded to others, or used by others.

AUTHORS:
Steffen Tischer, Yi Jiang, Katherine W. Hughes, M. D. Patil and Michael Murtagh - Corning Incorporated

ABSTRACT:
In this paper we present a comparison of two different approaches to model three-way catalyst. First, a numerical sample case simulating light-off is used to compare the 1D and the 2D models. The advantages of each code are discussed with respect to required input data, detail level of the output, comparability, and computation time. Thus, the 2D model reveals significant radial temperature gradients inside the monolith during light-off. In a second step, the 2D model is compared with experimental data. One set of data consists of an air/fuel ratio varying sweep at isothermal conditions. Another set was gained by emission measurements during a real driving MVEG tests with varying substrate cell density & inlet conditions. From these experiments the applicability of the model to numerical parameter studies is discussed.