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Fuel mixture stratification as a method for improving homogeneous charge compression ignition engine operation

United States Patent

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October 31, 2006
View the Complete Patent at the US Patent & Trademark Office
Low Temperature Gasoline Combustion
A method for slowing the heat-release rate in homogeneous charge compression ignition ("HCCI") engines that allows operation without excessive knock at higher engine loads than are possible with conventional HCCI. This method comprises injecting a fuel charge in a manner that creates a stratified fuel charge in the engine cylinder to provide a range of fuel concentrations in the in-cylinder gases (typically with enough oxygen for complete combustion) using a fuel with two-stage ignition fuel having appropriate cool-flame chemistry so that regions of different fuel concentrations autoignite sequentially.
Dec; John E. (Livermore, CA)Sjoberg; Carl-Magnus G. (Livermore, CA)
Sandia National Laboratories (Livermore, CA)
11/ 095,256
March 29, 2005
123/295 123/299123/305
F02B 17/00 (20060101)
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under contract no. DE-AC04-94AL85000 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention, including a paid-up license and the right, in limited circumstances, to require the owner of any patent issuing in this invention to license others on reasonable terms.