This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Evaluation of On-Board Diagnostic Systems and the Impact of Gasoline Containing MMT
Annotation ability available
Sector:
Language:
English
Abstract
The Clean Air Act of 1990 requires on-board diagnostics (OED) capabilities on all new vehicles. These diagnostic systems monitor the performance of engine and emission system components and inform the vehicle operator when component or system degradation could significantly impact emissions. Acceptable operation of the monitor requires proper treatment of system variables. Fuel composition is one of many possible variables that must be considered for monitoring components directly in the exhaust stream.
Recently, the octane enhancing, emissions reducing additive methylcyclopentadienyl manganese tricarbonyl (MMT) was reintroduced into unleaded gasoline in the U.S. Prior to reintroduction, the additive underwent extensive testing to demonstrate that use of MMT does not adversely affect vehicle emissions or the operation of emission systems such as OBD. However, questions have been raised about the influence of the additive on OBD systems. The results from additional testing, carried out as part of the ongoing evaluation of the additive, are reported in this paper. The results of this testing, including studies performed on a production OBD system, demonstrate that the use of the fuel additive MMT does not adversely affect the ability of OBD systems to identify degraded emission components. In addition, this study has led to a better understanding of the design and operational parameters behind a current OBD catalyst monitor system.
Authors
Citation
Roos, J., Scull, H., Dykes, K., Hotchkiss, A. et al., "Evaluation of On-Board Diagnostic Systems and the Impact of Gasoline Containing MMT," SAE Technical Paper 972849, 1997, https://doi.org/10.4271/972849.Also In
References
- Beck, D.B. Silvis, T.W. Mahan, S.T. “Impact of Fuel Sulfur on OED-II Catalyst Monitoring Using the Dual Oxygen Sensor Approach,” SAE paper 941054 1994
- Hepburn, J.S. Dobson, D.A. Hubbard, C.P. Guldberg, S.O. Thanasiu, E. Watkins, W.L. Burns, B.D. Gandi, H.S. “A Review of the Dual EGO Sensor Method for OED-II Catalyst Efficiency Monitoring,” SAE Paper 942057 1994
- Hubbard, C.P. Hepburn, J.S. Gandhi, H.S. “Effect of MMT on the OED-II Catalyst Monitor,” SAE Paper 932855 1993
- Roos, J.W. Lenane, D.L. Fort, B.F. Grande, D.G. Dykes, K.L. “The Effect of Manganese Oxides on OED-II Catalytic Converter Monitoring,” SAE Paper 942056 1994
- Ford Motor Company Section 211(C) Impacts of MMT April 29 1994
- Hepburn, J.S. Gandhi, H.S. “The Relationship Between Catalyst Hydrocarbon Conversion Efficiency and Oxygen Storage Capacity,” SAE Paper 920831 1992
- Fisher, G.B. Theis, J.R. Casarella, M.V. Mahan, S.T. “The Role of Ceria in Automotive Exhaust Catalysis and OBD-II Catalyst Monitoring,” SAE Paper 931034 1993
- 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
- Ihara, K. Murakami, H. Ohkubo, K. “Improvement of Three-Way Catalysts performance by Optimizing Ceria Impregnation,” SAE Paper 902168 1990
- Hepburn, J.S. Dobson, D.A. Hubbard, C.P. Otto, K. “The Pulse Flame Combuster Revisited,” SAE Paper 962118 1996
- Air Resources Board “Staff Report: Initial Statement of Reasons for Rulemaking, Technical Status and Proposed Revisions to Malfunction and Diagnostic System Requirements for 1994 and Subsequent Model-Year Passenger Cars, Light Duty Trucks, and Medium Duty Vehicles and Engines (OED-II) State of California October 25 1996
- Lenane, D.L. “Effect of a Fuel Additive on Emission Control Systems,” SAE Paper 902097 1990
- Lenane, D.L. Fort, B.F. Ter Haar, G.L. Lynam, D.R. Pfieifer, G.D. “Emission Results from a 48 car Test Evaluation of MMT Performance Additive,” Sci. Total Environ. 146 1994
- Ethyl Submission before the EPA in Re; Application for a Fuel Additive Waiver for HiTEC 3000® August 30 1993 1993
- Williamson, W.B. Gandhi, H.S. Weaver, E.E. “Effects of Fuel Additive MMT on Contaminant Retention and Catalysts Performance,” SAE Paper 821193 1982
- Aradi, A.A. Roos, J.W. Fort, B.F. Lee, T.E. Davidson, R.I. “The Physical and Chemical Effect of Manganese Oxides on Automobile Catalytic Converters,” SAE Paper 940747 1994
- Herz, R.K. “Dynamic Behavior of Automotive Catalysts. 1. Catalyst Oxidation and Reduction,” Ind. Eng. Chem. Prod. Res. Dev. 20 1981
- Meitzler, A.H. “Application of Exhaust-Gas-Oxygen Sensors to the Study of Storage Effects in Automotive Three-Way Catalysts,” SAE Paper 800019 1980
- “Oxidation of CO and C2H4 by Base Metal Catalysts Prepared on Honeycomb Supports,” in Catalysts for the Control of Automotive Pollutants MkEvoy J.E. American Chemical Society Washington D.C. 1975
- Edwards, H.W. Harrison, R.M. “Catalysis of NO Decomposition by Mn30,,” Environ. Sci. Tech. 13 1979
- Yamashita, T. Vannice, A. “NO Decomposition over Mn203 and Mn304,” J. Catal. 163 1996
- Wang, T. Soltis, R.E. Logothetis, E.M. Cook, J.A. Hamburg, D.R. “Static Characteristics of Zr02 Exhaust Gas Oxygen Sensors,” SAE Paper 930352 1993