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Diesel Exhaust Emissions Control for Light Duty Vehicles
Technical Paper
2003-01-0041
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The objective of this paper is to present the results of diesel exhaust aftertreatment testing and analysis done under the FreedomCAR program. Nitrogen Oxides (NOx) adsorber technology was selected based on a previous investigation of various NOx aftertreatment technologies including non-thermal plasma, NOx adsorber and active lean NOx. Particulate Matter (PM) emissions were addressed by developing a catalyzed particulate filter. After various iterations of the catalyst formulation, the aftertreatment components were integrated and optimized for a light duty vehicle application.
This compact exhaust aftertreatment system is dual leg and consists of a sulfur trap, NOx adsorbers, and catalyzed particulate filters (CPF). During regeneration, supplementary ARCO ECD low-sulfur diesel fuel is injected upstream of the adsorber and CPF in the exhaust. Steady state and transient emission test results with and without the exhaust aftertreatment system (EAS) are presented. Results of soot filter regeneration by injecting low-sulfur diesel fuel and slip of unregulated emissions, such as NH3, are discussed. Effects of adsorber size and bypass strategy on NOx conversion efficiency and fuel economy penalty are also presented in this paper. The results indicate that if the supplementary fuel injection is optimized, NH3 slip is negligible. During the FTP cycle, injection of low sulfur diesel fuel can create temperature exotherms high enough to regenerate a loaded CPF. With the optimized NOx adsorber regeneration strategies the fuel injection penalty can be reduced by 40 to 50%. Results for various other issues like low temperature light off, reductant optimization, exhaust sulfur management, system integration and design trade-off, are also presented and discussed in this paper.
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Mital, R., Li, J., Huang, S., Stroia, B. et al., "Diesel Exhaust Emissions Control for Light Duty Vehicles," SAE Technical Paper 2003-01-0041, 2003, https://doi.org/10.4271/2003-01-0041.Also In
Diesel Emission Measurement, Modeling, & Control from the SAE 2003 World Congress on CD-ROM
Number: SP-1754CD; Published: 2003-03-03
Number: SP-1754CD; Published: 2003-03-03
References
- “Development of Advanced Aftertreatment Subsystem Technologies for CIDI Diesel Engines,” Diesel Engine Emission Reduction Workshop Yu Robert C. Cole Scott Howden Ken August 2001
- “Employing Reactor Studies for the Research and System Development of Lean NO x Traps,” Diesel Engine Emission Reduction Workshop Currier Neal De Witt Matthew J. Yezerets Alex Buglass John Bakker Geert Powell Joe Cowan Steve Weider Paul Wan C Z Portsmouth, VA August 2001
- “Impact of Sulfur on NO X Trap Catalyst activity - Study of the Regeneration Conditions” SAE 982607 Guyon M. Blejean F. Bert C. Le Faou Ph. Oct. 1998
- “Effects of Sulfur on Performance of Catalytic Aftertreatment Devices” SAE 920557 Farrauto Robert J. Mooney John J. 1992
- “Effect of reductant on NOx adsorbers” Diesel Engine Emission Reduction Workshop Mital Rahul Dipchand J. Wan C.Z. Portsmouth, VA August 2001
- Bailey, O. Dou, D. Denison, G.W. “Regeneration Strategies for NOx Adsorber Catalysts” SAE 972845 1997