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Optimization of the Monitored Volume for LEV Catalyst Monitoring
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Abstract
A model of Ford's current FTP based OBD-II catalyst monitor has been developed and used in determining the optimal monitored catalyst volume for several LEV applications. The model predictions were found to agree reasonably well with the available experimental data. Furthermore, the results of this study indicate that the optimal monitored catalyst volume for meeting LEV requirements is vehicle application specific. As a result, it is concluded that a general guideline for sizing of the monitored catalyst volume for LEVs will most likely be inadequate and could result in grossly suboptimal catalyst monitor function for some applications. The model which is described in this paper offers a potentially more effective means of determining the best monitored catalyst volume for a given vehicle application. It should be possible to utilize this model during the early phase of a vehicle program in order to provide for the optimal packaging of the catalyst monitor sensor (CMS).
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Hepburn, J., Chanko, T., and Zimlich, G., "Optimization of the Monitored Volume for LEV Catalyst Monitoring," SAE Technical Paper 972847, 1997, https://doi.org/10.4271/972847.Also In
References
- Clemmens, W.B. Sabourin, M.A. Rao, T. “Detection of Catalyst Performance Loss Using On-Board Diagnostics” SAE Paper 900062 1990
- Koupal, J.W. Sabourin, M.A. Clemmens, W.B. “Detection of Catalyst Failure On-Vehicle Using the Dual Oxygen Sensor Method” SAE Paper 910561 1991
- Wade, D.R. “Catalyst Diagnostic Index vs. Steady State HC Efficiency” General Motors Presentation at the 1991 SAE OBD-II Feasibility Workshop August 21-22 1991
- Hepburn, J.S. Gandhi H.S. “The Relationship Between Catalyst Hydrocarbon Conversion Efficiency and Oxygen Storage Capacity” SAE Paper 920831
- Theis, J.R. LaBarge, W.J. Fisher, G.B. “The Effects of Catalyst Volume and Ceria Content on Emission Performance and Oxygen Storage Capacity of Automobile Catalysts” SAE Paper 932666 1993
- Hepburn, J.S. Dobson, D.A. Hubbard, C.P. Guldberg, S.O. Thanasiu, E. Watkins, W.L. Burns, B.D. Gandhi, H.S. “A Review of the Dual EGO Sensor Method for OBD-II Catalyst Efficiency Monitoring” SAE Paper 942057 1994
- Hepburn, J.S. Dobson, D.A. Gandhi, H.S. “A New Test for Catalyst Oxygen Storage Which Correlates with Catalyst Peformance on the Vehicle” SAE Paper 942071 1994
- Hepburn, J.S. “OBD-II Threshold Catalyst Aging Process”