Diesel Emissions in Review
This review summarizes the latest developments in diesel emissions regarding regulations, engines, NOx (nitrogen oxides) control, particulate matter (PM) reductions, and hydrocarbon (HC) and CO oxidation. Regulations are advancing with proposals for 70% tightening of fleet average light-duty (LD) criteria emissions likely to be proposed in California for ~2016-22. CO2 regulations in both the heavy- and light-duty sectors will also tighten and impact diesel engines and emissions, probably long into the future. Engine technology is addressing these needs. Light-duty diesel engines are making incremental gains with combustion enhancements that allow downsizing for CO2 savings. Heavy-duty (HD) engine show trade-offs between hardware recipes, exhaust deNOx control, and fuel consumption. Much has recently been reported on optimized selective catalytic reduction (SCR) systems, with many reports on improving low temperature performance with proper reductant management and new catalyst formulations. Developments on HC-based deNOx are focused on lean NOx traps (LNTs) and the LNT+SCR systems, wherein the LNT is calibrated to generate ammonia for use in a downstream SCR. PM control with DPFs (diesel particulate filters) are very effective. DPF regeneration advances are reported in strategy, catalyst utilization, and substrate design. Biodiesel effects on DPF functions are becoming clearer. Finally, diesel oxidation catalysts (DOCs) are investigated in the context of impacting NO2 coming from a downstream catalyzed DPF for use in an SCR system. Hydrocarbon removal from the DOC is quite important in this regard.
- Record URL:
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/19463936
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Supplemental Notes:
- Abstract reprinted with permission of SAE International.
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Authors:
- Johnson, Timothy V
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Conference:
- SAE 2011 World Congress & Exhibition
- Location: Detroit Michigan, United States
- Date: 2011-4-12 to 2011-4-14
- Publication Date: 2011-4-12
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 143-157
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Serial:
- SAE International Journal of Engines
- Volume: 4
- Issue Number: 1
- Publisher: SAE International
- ISSN: 1946-3936
- EISSN: 1946-3944
- Serial URL: https://www.sae.org/publications/collections/content/E-JOURNAL-03/
Subject/Index Terms
- TRT Terms: Compression ignition engines; Diesel engine exhaust gases; Diesel engines; Filters; Hydrocarbons; Nitrogen oxides; Particulates; Selective catalytic reduction
- Subject Areas: Environment; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01676550
- Record Type: Publication
- Source Agency: SAE International
- Report/Paper Numbers: 2011-01-0304
- Files: TRIS, SAE
- Created Date: Jul 26 2018 2:39PM