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Engine combustion control via fuel reactivity stratification

United States Patent

July 14, 2015
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A compression ignition engine uses two or more fuel charges having two or more reactivities to control the timing and duration of combustion. In a preferred implementation, a lower-reactivity fuel charge is injected or otherwise introduced into the combustion chamber, preferably sufficiently early that it becomes at least substantially homogeneously dispersed within the chamber before a subsequent injection is made. One or more subsequent injections of higher-reactivity fuel charges are then made, and these preferably distribute the higher-reactivity matter within the lower-reactivity chamber space such that combustion begins in the higher-reactivity regions, and with the lower-reactivity regions following thereafter. 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).
Reitz; Rolf Deneys (Madison, WI), Hanson; Reed M. (Madison, WI), Splitter; Derek A. (Madison, WI), Kokjohn; Sage L. (Fitchburg, WI)
Wisconsin Alumni Research Foundation (Madison, WI)
14/ 108,868
December 17, 2013
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with United States government support awarded by the following agencies: U.S. Department of Energy (DOE) Grant No.: DE-FC26-06NT42628 U.S. Department of Energy (DOE) Grant No.: DE-AC04-94AL85000 The United States government has certain rights in this invention.