Skip to Content
Find More Like This
Return to Search

Exhaust after-treatment system with in-cylinder addition of unburnt hydrocarbons

United States Patent

October 30, 2007
View the Complete Patent at the US Patent & Trademark Office
Certain exhaust after-treatment devices, at least periodically, require the addition of unburnt hydrocarbons in order to create reductant-rich exhaust conditions. The present disclosure adds unburnt hydrocarbons to exhaust from at least one combustion chamber by positioning, at least partially within a combustion chamber, a mixed-mode fuel injector operable to inject fuel into the combustion chamber in a first spray pattern with a small average angle relative to a centerline of the combustion chamber and a second spray pattern with a large average angle relative to the centerline of the combustion chamber. An amount of fuel is injected in the first spray pattern into a non-combustible environment within the at least one combustion chamber during at least one of an expansion stroke and exhaust stroke. The exhaust with the unburnt amount of fuel is moved into an exhaust passage via an exhaust valve.
Coleman; Gerald N. (Corby, GB), Kesse; Mary L. (Peoria, IL)
Caterpillar Inc. (Peoria, IL)
11/ 159,903
June 23, 2005
U.S. GOVERNMENT RIGHTS This disclosure was made with government support under the terms of Contract No. DE-FC05-97OR22605 awarded by the Department of Energy. The government may have certain rights in this invention.