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Engine combustion control at low loads via fuel reactivity stratification

United States Patent

October 7, 2014
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A compression ignition (diesel) engine uses two or more fuel charges during a combustion cycle, with the fuel charges having two or more reactivities (e.g., different cetane numbers), in order to control the timing and duration of combustion. By appropriately choosing the reactivities of the charges, their relative amounts, and their timing, combustion can be tailored to achieve optimal power output (and thus fuel efficiency), at controlled temperatures (and thus controlled NOx), and with controlled equivalence ratios (and thus controlled soot). At low load and no load (idling) conditions, the aforementioned results are attained by restricting airflow to the combustion chamber during the intake stroke (as by throttling the incoming air at or prior to the combustion chamber's intake port) so that the cylinder air pressure is below ambient pressure at the start of the compression stroke.
Reitz; Rolf Deneys (Madison, WI), Hanson; Reed M. (Riverton, MN), Splitter; Derek A. (Madison, WI), Kokjohn; Sage L. (Fitchburg, WI)
Wisconsin Alumni Research Foundation (Madison, WI)
13/ 077,378
March 31, 2011
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with government support under DE-AC04-94AL85000 awarded by the U.S. Department of Energy. The government has certain rights in this invention.