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Exhaust gas recirculation system for an internal combustion engine

United States Patent

8,443,789
May 21, 2013
View the Complete Patent at the US Patent & Trademark Office
An exhaust gas recirculation system for an internal combustion engine comprises an exhaust driven turbocharger having a low pressure turbine outlet in fluid communication with an exhaust gas conduit. The turbocharger also includes a low pressure compressor intake and a high pressure compressor outlet in communication with an intake air conduit. An exhaust gas recirculation conduit fluidly communicates with the exhaust gas conduit to divert a portion of exhaust gas to a low pressure exhaust gas recirculation branch extending between the exhaust gas recirculation conduit and an engine intake system for delivery of exhaust gas thereto. A high pressure exhaust gas recirculation branch extends between the exhaust gas recirculation conduit and the compressor intake and delivers exhaust gas to the compressor for mixing with a compressed intake charge for delivery to the intake system.
Wu; Ko-Jen (Troy, MI)
GM Global Technology Operations LLC (Detroit, MI)
12/ 842,169
20120017879
July 23, 2010
GOVERNMENT RIGHTS This invention was made with U.S. Government support under agreement number DE-FC26-07NT43271 awarded by the Department of Energy. The U.S. Government may have certain rights in this invention.