Internal combustion engine with an exhaust gas recirculation system
AssigneeMercedes-Benz AG
InventorUwe Gartner
Life of this patent
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Abstract
In an internal combustion engine with an exhaust gas recirculation system and an exhaust gas turbocharger having a turbine arranged in an exhaust gas duct and a compressor operated by the turbine and being disposed in an air supply duct for supplying charge air to the engine, an exhaust gas recirculation line extends between the exhaust gas duct upstream of the turbine and the air supply duct and downstream of the compressor. Cooling means are arranged in the exhaust gas duct and heating means are arranged in the air supply duct upstream of the compressor to permit the generation of a pressure differential between the exhaust gas duct and the air supply duct which provides for an exhaust gas recirculation flow through the exhaust gas recirculation line over a large engine operating range.
Claims7
An internal combustion engine with an air supply duct and an exhaust gas duct and an exhaust gas recirculation system including an exhaust gas turbocharger having a turbine arranged in said exhaust gas duct so as to be driven by the exhaust gas discharged from said engine through said exhaust gas duct, and a compressor operated by said turbine and being in communication with said air supply duct for supplying charge air to said engine, an exhaust gas recirculation line extending between said exhaust gas duct upstream of said turbine and said air supply duct downstream of said compressor for recirculating exhaust gas from said exhaust gas duct to said air supply duct, a first heat exchanger arranged in said exhaust gas duct for reducing the temperature of the exhaust gas therein, a second heat exchanger arranged in said air supply duct for increasing the temperature of said charge air supplied to said engine and means for controlling the temperature of the exhaust gas entering said turbine and of the charge air entering said compressor to thereby provide for a pressure differential between the exhaust gas in said exhaust gas duct and the charge air in said air supply duct over a large engine operating range.
Dependencies are inferred from the claim text.