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Method of controlling cyclic variation in engine combustion

United States Patent

5,921,221
July 13, 1999
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
Cyclic variation in combustion of a lean burning engine is reduced by detecting an engine combustion event output such as torsional acceleration in a cylinder (i) at a combustion event (k), using the detected acceleration to predict a target acceleration for the cylinder at the next combustion event (k+1), modifying the target output by a correction term that is inversely proportional to the average phase of the combustion event output of cylinder (i) and calculating a control output such as fuel pulse width or spark timing necessary to achieve the target acceleration for cylinder (i) at combustion event (k+1) based on anti-correlation with the detected acceleration and spill-over effects from fueling.
Davis, Jr.; Leighton Ira (Ann Arbor, MI), Daw; Charles Stuart (Knoxville, TN), Feldkamp; Lee Albert (Plymouth, MI), Hoard; John William (Livonia, MI), Yuan; Fumin (Canton, MI), Connolly; Francis Thomas (Ann Arbor, MI)
Ford Global Technologies, Inc. (Dearborn, MI), Ford Motor Company (Dearborn, MI), Lockheed Martin Energy Research Corp. (Oak Ridge, TN)
09/ 075,291
May 8, 1998
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The United States Government has rights in this invention pursuant to Contract No. DE-AC0596OR22464 between the United States Department of Energy and Lockheed Martin Energy Research Corporation.