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Systems and methods for controlling diesel engine emissions

United States Patent

6,742,328
June 1, 2004
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
Systems and methods for controlling diesel engine emissions, including, for example, oxides of nitrogen emissions, particulate matter emissions, and the like. The emission control system according to this invention is provided in the exhaust passageway of a diesel engine and includes a catalyst-based particulate filter; and first and second lean NO.sub.x trap systems coupled to the catalyst-based particulate filter. The first and second lean NO.sub.x trap systems are arranged in a parallel flow configuration with each other. Each of the first and second lean NO.sub.x trap systems include a carbon monoxide generating catalyst device, a sulfur trap device, a lean NO.sub.x device, a supplemental fuel injector device, and a plurality of flow diverter devices.
Webb; Cynthia Chaffin (San Antonio, TX), Weber; Phillip Anthony (San Antonio, TX), Khair; Magdi K. (San Antonio, TX)
Southwest Research Institute (San Antonio, TX)
10/ 268,896
October 11, 2002
The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided by the terms of U.S. Government Contract No. NCI-1-31024-02 awarded by the National Renewable Energy Laboratory.