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Monovalve with integrated fuel injector and port control valve, and engine using same

United States Patent

6,311,668
November 6, 2001
View the Complete Patent at the US Patent & Trademark Office
An engine includes an engine casing that defines a hollow piston cavity separated from an exhaust passage and an intake passage by a valve seat. A gas exchange valve member is positioned adjacent the valve seat and is moveable between an open position and a closed position. The gas exchange valve member also defines an opening that opens into the hollow piston cavity. A needle valve member is positioned in the gas exchange valve member adjacent a nozzle outlet and is moveable between an inject position and a blocked position. A port control valve member, which has a hydraulic surface, is mounted around the gas exchange valve member and moveable between an intake position and an exhaust position. A pilot valve is moveable between a first position at which the port control hydraulic surface is exposed to a source of high pressure fluid, and a second position at which the port control hydraulic surface is exposed to a source of low pressure fluid.
Milam; David M. (Metamora, IL)
Caterpillar Inc. (Peoria, IL)
09/ 503,659
February 14, 2000
The Government has the rights in this invention pursuant to Contract No. DE-FC05-97OR22605-RS96-006 awarded by the U.S. Department of Energy.