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Four-Flow Path High-Efficiency NOx and PM Exhaust Emission Control System for Heavy-Duty On-Highway Diesel Engines
Technical Paper
2003-01-2305
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A 5.9 liter medium-heavy-duty diesel engine, meeting the emissions performance of a MY 2000 US heavy-duty on-highway engine, was tested with and without a diesel exhaust emission control system consisting of catalyzed diesel particulate filters and adsorber catalysts NOx arranged in a four-flow path configuration. This four-flow path system represents a significant reduction in catalyst volume when compared to previous systems tested by EPA. The goal of this project was to achieve high NOx reduction over the Heavy-Duty Diesel Engine Federal Test Procedure (HDDE-FTP) and Supplemental Emission Test (SET), consistent with the 2007 U.S. heavy-duty engine emissions standards, using this reduced volume system. Supply of hydrocarbon reductant for NOx adsorber regeneration was accomplished via a secondary exhaust fuel injection system. Alternating the restriction of the exhaust flow between the four-flow paths allowed reductant injection and adsorber regeneration to occur under very low space velocity conditions. Emissions of NOx were reduced by 78% over the HDDE-FTP and 89% over the SET; reduced by 78% over the HDDE-FTP and 89% over the SET; and particulate matter (PM) emissions were reduced by 86% over the HDDE-FTP and SET. System improvements were identified during this testing which should allow the system to meet the 2007 emission targets. These improvements will be validated in future testing.
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Schenk, C., Laroo, C., Olson, B., and Fisher, L., "Four-Flow Path High-Efficiency NOx and PM Exhaust Emission Control System for Heavy-Duty On-Highway Diesel Engines," SAE Technical Paper 2003-01-2305, 2003, https://doi.org/10.4271/2003-01-2305.Also In
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