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Engine cylinder temperature control

United States Patent

September 27, 2005
View the Complete Patent at the US Patent & Trademark Office
A method and apparatus for controlling a temperature in a combustion cylinder in an internal combustion engine. The cylinder is fluidly connected to an intake manifold and an exhaust manifold. The method and apparatus includes increasing a back pressure associated with the exhaust manifold to a level sufficient to maintain a desired quantity of residual exhaust gas in the cylinder, and varying operation of an intake valve located between the intake manifold and the cylinder to an open duration sufficient to maintain a desired quantity of fresh air from the intake manifold to the cylinder, wherein controlling the quantities of residual exhaust gas and fresh air are performed to maintain the temperature in the cylinder at a desired level.
Kilkenny; Jonathan Patrick (Peoria, IL), Duffy; Kevin Patrick (Metamora, IL)
Caterpillar Inc. (Peoria, IL)
10/ 731,717
December 9, 2003
GOVERNMENT RIGHTS This invention was made with Government support under DE-FC05-00OR22806 awarded by the Department of Energy. The Government has certain rights in this invention.