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Exhaust gas recirculation in a homogeneous charge compression ignition engine

United States Patent

May 27, 2008
View the Complete Patent at the US Patent & Trademark Office
A homogeneous charge compression ignition engine operates by injecting liquid fuel directly in a combustion chamber, and mixing the fuel with recirculated exhaust and fresh air through an auto ignition condition of the fuel. The engine includes at least one turbocharger for extracting energy from the engine exhaust and using that energy to boost intake pressure of recirculated exhaust gas and fresh air. Elevated proportions of exhaust gas recirculated to the engine are attained by throttling the fresh air inlet supply. These elevated exhaust gas recirculation rates allow the HCCI engine to be operated at higher speeds and loads rendering the HCCI engine a more viable alternative to a conventional diesel engine.
Duffy; Kevin P. (Metamora, IL), Kieser; Andrew J. (Morton, IL), Rodman; Anthony (Chillicothe, IL), Liechty; Michael P. (Chillicothe, IL), Hergart; Carl-Anders (Peoria, IL), Hardy; William L. (Peoria, IL)
Caterpillar Inc. (Peoria, IL)
11/ 584,889
October 23, 2006
This invention was made with Government support under DOE Contract No. DE-FC26-05NT4 2412 awarded by the U.S. Department of Energy. The Government has certain rights to this invention.