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Engine control system having emissions-based adjustment

United States Patent Application

20100126481
A1
View the Complete Application at the US Patent & Trademark Office
A control system for an engine having a first cylinder and a second cylinder is disclosed including an air/fuel ratio control device configured to affect an air/fuel ratio within the first and second cylinders. The control system also has a first sensor configured to generate a first signal indicative of a combustion pressure within the first cylinder and a second sensor configured to generate a second signal indicative of a combustion pressure within the second cylinder. The control system further has a controller in communication with the air/fuel ratio control device and the first and second sensors. The controller is configured to determine a NOx production within the first cylinder based on the first signal and determine a NOx production within the second cylinder based on the second signal. The control is also configured to calculate a total NOx production of the engine based on at least the NOx produced within the first and second cylinders and selectively regulate the air/fuel ratio control device to adjust the air/fuel ratio within the first and second cylinders based on the total NOx production of the engine.
Willi, Martin L. (Dunlap, IL), Fiveland, Scott B. (Metamora, IL), Montgomery, David T. (Edelstein, IL), Gong, Weidong (Dunlap, IL)
CATERPILLAR INC.
12/ 292,826
November 26, 2008
STATEMENT OF GOVERNMENT INTEREST [0001] This invention was made with Government support under Contract No. DE-FC02-01CH11079, awarded by the Department of Energy. The Government may have certain rights in this invention.