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Automatic set point adjustment system and method for engine air-fuel ratio control system

United States Patent

April 5, 2016
View the Complete Patent at the US Patent & Trademark Office
Systems and methods for continuous automatic adjustment of a control set point of an air-fuel ratio controller of a rich burn engine so as to maintain emissions within a desired range. In an embodiment, a NOx sensor is placed in the exhaust outlet from an exhaust catalyst and the NOx exhaust sensor output is continuously monitored while adjusting the control set point between rich and lean in order to minimize the output from the NOx sensor. Corrections may be continuously made to the set point during operation of the engine to compensate for changes in environmental conditions, engine loads, and other factors.
Fisher; David Gordon (Carlsbad, CA), Fisher; Richard Ross (San Marcos, CA), Laur; Galina (San Diego, CA), Grimes, III; Hillary H. (San Diego, CA), Yates; Kristian W. (Valley Center, CA), Zahir; John A. (San Diego, CA), Vronay; John C. (La Jolla, CA)
13/ 629,329
September 27, 2012
This invention was made with support from the State of California under California Energy Commission Grant No. PIR-07-008. The California Energy Commission has certain rights in the invention.