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ENGINE CONTROL SYSTEMS AND METHODS FOR NITROGEN OXIDE REDUCTION

United States Patent Application

20170198652
A1
View the Complete Application at the US Patent & Trademark Office
A fuel control module controls fuel injection of an engine based on a predetermined lean air/fuel ratio. The predetermined lean air/fuel ratio is fuel lean relative to a stoichiometric air/fuel ratio for the fuel. A cylinder control module selectively deactivates opening of intake and exhaust valves of M cylinders of the engine to increase removal of nitrogen oxide (NOx) from exhaust. M is an integer greater than 0 and less than a total number of cylinders of the engine. The fuel control module further: disables fueling of the M cylinders while opening of the intake and exhaust valves of the M cylinders is deactivated; and, while fueling of the M cylinders is disabled and opening of the intake and exhaust valves of the M cylinders is deactivated, controls fuel injection of other cylinders based on a predetermined rich air/fuel ratio that is fuel rich relative to the stoichiometric air/fuel ratio.
SCZOMAK, David P. (Troy, MI), GALLON, Robert J. (Northville, MI), MCALPINE, Robert S. (Lake Orion, MI), SOLOMON, Arun S. (Rochester Hills, MI)
14/ 994,531
January 13, 2016
STATEMENT OF GOVERNMENT RIGHTS [0001] This invention was produced pursuant to United States Government Program No. DE-EE00006853 with the Department of Energy (DoE). The U.S. Government has certain rights in this invention.