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Development of Diesel Exhaust Aftertreatment System for Tier II Emissions
Technical Paper
2002-01-1867
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
Future Car Congress
Language:
English
Abstract
Due to their excellent fuel efficiency, reliability, and durability, compression ignition direct injection (CIDI) engines have been used extensively to power almost all highway trucks, urban buses, off-road vehicles, marine carriers, and industrial equipment. CIDI engines burn 35 to 50% less fuel than gasoline engines of comparable size, and they emit far less greenhouse gases (Carbon Dioxides), which have been implicated in global warming. Although the emissions of CIDI engines have been reduced significantly over the last decade, there remains concern with the Nitrogen Oxides (NOX) and Particulate Matter (PM) emission levels. In 2000, the US EPA proposed very stringent emissions standards to be introduced in 2007 along with low sulfur (< 15ppm) diesel fuel. The California Air Resource Board (CARB) has also established the principle that future diesel fueled vehicles should meet the same emissions standards as gasoline fueled vehicles and the EPA followed suit with its Tier II emissions regulations.
Meeting the Tier II standards requires NOX and PM emissions to be reduced dramatically. Achieving such low emissions while minimizing fuel economy penalty cannot be done through engine development and fuel reformulation alone, and requires application of NOX and PM aftertreatment control devices. A joint effort was made between Cummins Inc. and the Department of Energy to develop the generic aftertreatment subsystem technologies applicable for Light-Duty Vehicle (LDV) and Light-Duty Truck (LDT) engines. This paper provides an update on the progress of this joint development program.
Three NOX reduction technologies including plasma-assisted catalytic NOX reduction (PACR), active lean NOX catalyst (LNC), and adsorber catalyst (AC) technology using intermittent rich conditions for NOX reduction were investigated in parallel in an attempt to select the best NOX control approach for light-duty aftertreatment subsystem integration and development. Investigations included system design and analysis, critical lab/engine experiments, and ranking then selection of NOX control technologies against reliability, up-front cost, fuel economy, service interval/serviceability, and size/weight. The results of the investigations indicate that the best NOX control approach for LDV and LDT applications is a NOX adsorber system. A greater than 83% NOX reduction efficiency is required to achieve 0.07g/mile NOX Tier II vehicle-out emissions. Both active lean NOX and PACR technology are currently not capable of achieving the high conversion efficiency required for Tier II, Bin 5 emissions standards.
In this paper, the NOX technology assessment and selection is first reviewed and discussed. Development of the selected NOX technology (NOX adsorber) and PM control are then discussed in more detail. Discussion includes exhaust sulfur management, further adsorber formulation development, reductant screening, diesel particulate filter development & active regeneration, and preliminary test results on the selected integrated SOX trap, NOX adsorber, and diesel particulate filter system over an FTP-75 emissions cycle, and its impact on fuel economy. Finally, the direction of future work for continued advanced aftertreatment technology development is discussed.
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Yu, R., Cole, A., Stroia, B., Huang, S. et al., "Development of Diesel Exhaust Aftertreatment System for Tier II Emissions," SAE Technical Paper 2002-01-1867, 2002, https://doi.org/10.4271/2002-01-1867.Also In
References
- “Fundamentals Limits on Gas-Phase Chemical Reduction of NO X in a Plasma” Penetrante B.M. Hsiao M.C. Merritt B.T. Voigtlin G.E. 1997 Diesel Engine Emissions Workshop July 28-31 1997
- “Plasma Assisted Heterogeneous Catalysis for NO X Reduction in Lean-burn Engine Exhausts” Hsiao M.C. Penetrante B.M. Merritt B.T. Voigtlin G.E. 1997 Diesel Engine Emissions Workshop July 28-31 1997
- “Plasma Enhanced Selective Catalytic Reduction of NO\dx for Diesel Cars” SAE 982428 Hammer A.G. Thomas Broer Stefan Oct. 1998
- “Limiting Factors and Effect of Sulfur on Plasma-Assisted Catalytic Reduction of NO X in Light-Duty Vehicle Exhaust” Penetrante B.M. 1999 Diesel Engine Emissions Workshop July 5-8 1999
- “Sulfur Tolerance of Selective Partial Oxidation of NO to NO 2 in a Plasma” Non-Thermal Plasma for Exhaust Emission Control: NO X , HC, and Particulates, SAE 1999-01-3687 Penetrante B.M. Brusasco R.M. Merrit B.T. Vogtlin G.E. 1999
- “Research Results on Processes and Catalyst Materials for Lean NO X Conversion” SAE 962041 Konig Axel etc Oct. 1996
- “Progress in Sulfur Poisoning Resistance of Lean NO X Catalysts” SAE 980930 Arakawa Kenji Matsuda Satoshi Kinoshita Hiroo Feb. 1998
- “Development of Zeolite Catalyst to Remove Diesel NO X ” SAE 958386 Iwasaki Masanori Ikeya Nobuyuki Itoh Masaharu Itoh Masaaki Sep. 1995
- “A Diesel Perspective on Lean NO X Catalysts” Bunting B.G. Cunningham M.J. Miller R.K. 1998 Diesel Engine Emissions Workshop July 5-9 1998
- “NO X Adsorber Catalysts Applied to Heavy Duty Diesel Test Cycles” Cunningham M.J. 1999 Diesel Engine Emissions Workshop July 5-8 1999
- “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
- “Effect of Fuel Sulfur and Aromatics on Diesel Exhaust Emissions” SAE 918221 Kobayashi Shinji Tohru Hori Masahiko 1991
- “Catalytic NO X Reduction by Diesel Fuel Spray Method” SAE 4-14-2-82 Sumiya Satoshi Makino Seiji Ogasawara Kozo Apr. 1993
- “Regeneration Strategies for NO X Adsorber Catalysts” SAE 972845 Bailey Owen Dou Danan Denison Gregory W. Oct. 1997
- “Future Application of Catalyzed Soot Filters” Miller R.K. Cunningham M.J. Ren S. 1998 Diesel Engine Emissions Workshop July 5-9 1998
- “Effects of Sulfur on Performance of Catalytic Aftertreatment Devices” SAE 920557 Farrauto Robert J. Mooney John J. 1992
- “Save the Diesel Fueled Engine: a Clean Diesel Engine with Catalytic Aftertreatment ∼ The alternative to Alternative Fuels Mooney John Wolfgang Joe Apr. 1993
- Popuri, S. et al. “Development of a Microwave Assisted Regeneration System for A Ceramic Diesel Particulate Trap System,” SAE Paper 1999-01-3565 1999
- Nixdorf, R.D. et al. “Microwave-regenerated Diesel Exhaust Particulate Filter,” SAE Paper 2001-01-0903 2001
- Cooper B.J. Thoss, J.E. “Role of NO in Diesel Particulate Emission Control” SAE 890404 1989
- DECSE 2000a “Phase I Interim Data Report No. 4: Diesel Particulate Filters” U.S. DOE January 2000