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Engine valve actuation for combustion enhancement

United States Patent

March 4, 2008
View the Complete Patent at the US Patent & Trademark Office
A combustion chamber valve, such as an intake valve or an exhaust valve, is briefly opened during the compression and/or power strokes of a 4-strokes combustion cycle in an internal combustion engine (in particular, a diesel or CI engine). The brief opening may (1) enhance mixing withing the combustion chamber, allowing more complete oxidation of particulates to decrease engine emissions; and/or may (2) delay ignition until a more desirable time, potentially allowing a means of timing ignition in otherwise difficult-to-control conditions, e.g., in HCCI (Homogeneous Charge Compression Ignition) conditions.
Reitz; Rolf Deneys (Madison, WI), Rutland; Christopher J. (Madison, WI), Jhavar; Rahul (Madison, WI)
Wisconsin Alumni Research Foundation (Madison, WI)
10/ 543,067
January 16, 2004
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with United States government support awarded by the following agencies: U.S. Department of Energy Grant No(s).: DE-FC04-02AL67612 The United States has certain rights in this invention.