Browse Publications Technical Papers 2003-01-2305

Four-Flow Path High-Efficiency NOx and PM Exhaust Emission Control System for Heavy-Duty On-Highway Diesel Engines 2003-01-2305

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.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 40% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.