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Advanced engine management of individual cylinders for control of exhaust species

United States Patent

December 30, 2008
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method and system controls engine-out exhaust species of a combustion engine having a plurality of cylinders. The method typically includes various combinations of steps such as controlling combustion parameters in individual cylinders, grouping the individual cylinders into a lean set and a rich set of one or more cylinders, combusting the lean set in a lean combustion parameter condition having a lean air:fuel equivalence ratio, combusting the rich set in a rich combustion parameter condition having a rich air:fuel equivalence ratio, and adjusting the lean set and the rich set of one or more cylinders to generate net-lean combustion. The exhaust species may have elevated concentrations of hydrogen and oxygen.
Graves; Ronald L. (Knoxville, TN), West; Brian H. (Knoxville, TN), Huff; Shean P. (Knoxville, TN), Parks, II; James E. (Knoxville, TN)
UT-Battelle, LLC (Oak Ridge, TN)
11/ 691,539
March 27, 2007
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with United States Government support under Contract No. DE-AC05-00OR22725 between the United States Department of Energy and U.T. Battelle, LLC. The United States Government has certain rights in this invention.