This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Sensitivity Analysis of Full Scale Catalyst Response under Dynamic Testing Conditions - A Method to Develop Further Understanding of Catalytic Converter Behavior Pt.1
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 05, 2016 by SAE International in United States
Annotation ability available
Catalyst aging is presently one of the most important aspects in aftertreatment development, with legislation stating that these systems must be able to meet the relevant emissions legislation up to a specified mileage on the vehicle, typically 150,000 miles.
The current industry approach for controlling aging cycles is based solely on the detailed specification of lambda (air-fuel mixture concentration ratio), flow rate and temperature without any limitations on gas mixture. This is purely based upon the experience of engine-based aging and does not take into account any variation due to different engine operation. Although accurate for comparative testing on the same engine/engine type, inconsistencies can be observed across different aging methods, engine types and engine operators largely driven by the capability of the technology used.
This study investigates the variation in thermal profiles measured along the axial length of a Three Way Catalyst (TWC) monolith for different gas compositions with constant inlet conditions of flow rate, temperature, oxygen concentration and lambda. The purpose of this study is to determine the possible differences in temperature profile due to the variation of carbon monoxide (CO) and hydrocarbon (HC) concentrations while maintaining the same lambda and oxygen concentration. Such differences would subsequently affect the level of aging within the catalyst whilst apparently applying the same test conditions.
The experimental data was obtained using a unique full scale aftertreatment testing system (recirculating synthetic gas reactor) with high precision and controllability to vary factors not normally or easily explored in typical Standard Gas Bench, engine testbed or vehicle based testing. The results clearly demonstrate that different temperatures can be generated by varying gas mixture alone and that this variation could cause a difference of 15% in aging at the front edge of the brick based on the BAT calculations.
|Journal Article||Analysis and Choice of Input Candidates for a Virtual NO x Sensor by a Mutual Information Approach|
|Technical Paper||A Novel Palladium Catalyst for Use in Vehicle Emissions Control|
CitationStewart, J., Stalker, R., O'Shaughnessy, R., Douglas, R. et al., "Sensitivity Analysis of Full Scale Catalyst Response under Dynamic Testing Conditions - A Method to Develop Further Understanding of Catalytic Converter Behavior Pt.1," SAE Technical Paper 2016-01-0979, 2016, https://doi.org/10.4271/2016-01-0979.
- Heck , R.M. , Farrauto , R.J. and Gulati , S.T. Catalytic Air Pollution Control, Commercial Technology Second 2002 New York John Wiley & Sons, Inc. 79 88
- Adam , F. , Schoenhaber , J. , and Wagner , A. Synthetic Gas Bench (SGB) Tests Simulating Real and Dynamic Driving Conditions: A New and Cost Attractive Method for TWC Evaluation SAE Technical Paper 2015-01-1066 2015 10.4271/2015-01-1066
- Blades , L. , Douglas , R. , McCullough , G. and Woods , A. Correlation of light-off activity for full size and cored catalyst samples 1st biennial international conference on powertrain modelling and control, testing, mapping and calibration, Bradford, West Yorkshire, UK 4-6, September 2012 1 13 Bradford: University of Bradford
- Blades , L. , Douglas , R. , McCullough , G. and Woods , A. Correlation of Static Aging Effects on Automotive Catalysts Can. J. Chem. Eng. 92 1526 1530 2014 10.1002/cjce.22012
- Environmental Protection Agency Federal Register 2006
- Baba , N. , Yokota , K. , Matsunaga , S. , Kojima , S. et al. Numerical Simulation of Deactivation Process of Three-way Catalytic Converters SAE Technical Paper 2000-01-0214 2000 10.4271/2000-01-0214
- Jobson , E. , Högberg , E. , Weber , K. , Smedler , G. et al. Spatially Resolved Effects of Deactivation on Field-Aged Automotive Catalysts SAE Technical Paper 910173 1991 10.4271/910173
- Brettschneider , J. et al. Bosch Technische Berichte 1979 6 1979 4 177 186