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Vehicle Emissions from Road Aged Passive Distributed Converter System for ULEV Emission Regulations
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Abstract
A real world aging study was performed on a distributed converter system to investigate ULEV potential and aging aspects. Two V-6 vehicles were fitted with 0.7 Liter Pd close mounted catalysts on each exhaust manifold and a traditional 2.8 Liter three-way underfloor catalyst. These vehicles were then driven in a high mileage fleet while tracking emission results every 10K miles up to 50K miles. At the end of 50K miles the system met ULEV requirements for CO and NOx but NMHC exceeded the target. Verification of aging was done by chemically cleaning the close coupled catalyst and by comparison to a dynamometer aged set. The results showed that most of the degradation in NMHC performance was due to poisoning with little effect from thermal aging. With most of the CO and NOx abatement being done in the underfloor catalyst their degradation is mainly thermal. Although a large volume of catalyst was used, it was determined that the traditional underfloor catalyst could be reduced by 1.3 Liters and still maintain similar results. It should be noted that a systems approach and well maintained vehicles were instrumental in achieving the results presented.
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Citation
Richmond, R., Goulette, D., and Thoreson, T., "Vehicle Emissions from Road Aged Passive Distributed Converter System for ULEV Emission Regulations," SAE Technical Paper 972848, 1997, https://doi.org/10.4271/972848.Also In
References
- Mondt, J. R. “An historical Overview of Emission-Control Techniques for Spark-Ignition Engines: Part B - Using Catalytic Converters.” ASME ICE 8 History of The Internal Combustion Engine 1989
- Code of Federal Regulations 40 July 1 1990 779 783
- Federal Register, Part II Environmental Protection Agency 40 March 7 1991 9754 9792
- Heck, R.M. Hu, Z. Smaling, R. Amundsen, A. Bourke, M.C. “Close Coupled Catalyst System Design and ULEV Performance after 1050°C Aging” SAE 952415
- Ma, T. Collings, N. Hands, T. “Exhaust Gas Ignition (EGI) - A New Concept for Rapid Light-Off of Automotive Exhaust Catalyst” SAE 920400 1992
- Chadwick, W. “A Fuel Heater to Rapidly Light Off a Catalytic Converter” SAE TOPTEC San Diego 1995
- Hochmuth, J.K. Burk, P.L. Telentino, C. Mignano, M.J. “Hydrocarbon Traps for Controlling Cold Start Emissions” SAE paper # 930739 1993
- Socha, L.S. Thompson, D.F. Weber, P.A. “Optimization of Extruded Electrically Heated Catalysts” SAE 940468 1994
- Blumer T.D. Richmond R.P. “Thermal Management of the Front Module of an Automotive Exhaust System for Reduced Cold-Start Emissions” 1995 Vehicle Thermal Management Systems Conference Proceedings