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Diesel emission reduction using internal exhaust gas recirculation

United States Patent

January 24, 2012
View the Complete Patent at the US Patent & Trademark Office
A method for controlling combustion in a direct-injection diesel engine includes monitoring a crankshaft rotational position of a cylinder of the engine, monitoring an engine load, determining an intake stroke within the cylinder based upon the crankshaft rotational position, and when the engine load is less than a threshold engine load, opening an exhaust valve for the cylinder during a portion of the intake stroke.
He; Xin (Denver, CO), Durrett; Russell P. (Bloomfield Hills, MI)
GM Global Technology Operations LLC (Detroit, MI)
12/ 499,475
July 8, 2009
GOVERNMENT LICENSE RIGHTS The U.S. Government has a paid-up license in this disclosure and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Cooperative Agreement Number DE-FC26-05NT42415 awarded by the U.S. Department of Energy.