This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Experimental Study of Lean NOx Trap Management
Technical Paper
2007-01-3442
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Lean NOx Trap (LNT) catalysts are capable of reducing exhaust NOx emissions from Diesel engines. NOx is stored on the catalyst substrate during the normal engine operation (lean mixture) and is reduced under rich exhaust condition (rich mixture) during the regeneration event. There are different methods to obtain the rich conditions and one of this is the so called “in cylinder” regeneration. This technique is feasible if the engine is equipped with electronic injection system (i.e. Common Rail system), in fact it is possible to obtain rich Air/Fuel ratios conditions using different injection strategies. Generally, one method to obtain the rich condition for the LNT regeneration consists of additional fuel's injection into the engine cylinders while acting at the same time on EGR and Throttle Valve to reduce the intake air flow.
In this study a 1.9 liter CR Diesel engine with a LNT catalyst system was used to evaluate different regeneration techniques and to characterize the catalyst substrate performance. The aim of this work was the evaluation of different engine parameters' influence on A/F ratio to obtain the rich condition by the realization of an experimental Design of Experiment (DOE) plane. Several experimental tests were carried out to evaluate the effects of different injection strategies (Pilot +delayed Main injection, Main +Post injection, etc) on A/F ratio, while keeping under control HC and CO emissions.
Recommended Content
Authors
Topic
Citation
Senatore, A., Cardone, M., Buono, D., and Sessa, G., "Experimental Study of Lean NOx Trap Management," SAE Technical Paper 2007-01-3442, 2007, https://doi.org/10.4271/2007-01-3442.Also In
References
- Webb Cynthia C. Weber Phillip A. Thornton Matthew “Achieving Tier 2 Bin 5 Emission Levels with a Medium Duty Diesel Pick-Up and a NOx Adsorber, Diesel Particulate Filter Emissions System NOx Adsorber Management,” SAE paper n. 2004-01-0585 2004
- Takahashi Yoshinori Takeda Yoshinaka Kondo Nobuhiro Murata Minehiro “Development of NOx Trap System for Commercial Vehicle - NOx Regeneration by Diesel Fuel and Phenomenon of Sulfur Poisoning and Regeneration” SAE paper n. 2004-01-0580 2004
- Stang John H. Koeberlein David E. Ruth Michael J. “Cummins Light Truck Diesel Engine Progress Report” SAE paper n. 2001-01-2065 2001
- Parks Jim Watson Aaron Campbell Greg Epling Bill “Durability of NOx Absorbers: Effects of Repetitive Sulfur Loading and Desulfation” SAE paper n. 2002-01-2880 2002
- Nakatani Koichiro Hirota Shinya Takeshima Shinichi Itoh Kazuhiro Tanaka Toshiaki “Simultaneous PM and NOx Reduction System for Diesel Engines” SAE paper n. 2002-01-0957 2002
- Tomazic Dean Tatur Marek M. Thornton Matthew J. “Development of a Diesel Passenger Car Meeting Tier 2 Emissions Legislation” SAE paper n. 2004-01-0581 2004
- Elwart Shane Surnilla Gopichandra Ura Justin Theis Joseph “H2S Suppression During the Desulfation of a Lean NOx Trap with a Nickel-Containing Catalyst” SAE paper n. 2005-01-1116 2005
- Colliou Thierry Lavy Jacques Martin Brigitte Chandès Karine Pichon Guy Pierron Loys “Coupling of a NOx Trap and a CDPF for Emission Reduction of a 6-Cylinder HD Engine” SAE paper n. 2004-01-1945 2004
- Ura Justin A. Goralski Christian T. Jr. Graham George W. McCabe Robert W. Theis Joseph R. “Laboratory Study of Lean NOx Trap Desulfation Strategies” SAE paper n. 2005-01-1114 2005
- Theis Joseph R. Ura Justin A. Goralski Christian T. Jr. Caine Jon Davies Marcus Kay Duncan Todd Andrew Dinsdale Steve “The Effects of Aging Temperature and PGM Loading on the NOx Storage Capacity of a Lean NOx Trap” SAE paper n. 2005-01-1117 2005