초록 ▼

An exhaust gas recirculation system for an internal combustion engine by which a portion of exhaust gases produced by the engine is recirculated from an exhaust line of the engine into an intake line of the engine introduces the EGR exhaust gas flow into the intake passageway via a mixer ejector whi

An exhaust gas recirculation system for an internal combustion engine by which a portion of exhaust gases produced by the engine is recirculated from an exhaust line of the engine into an intake line of the engine introduces the EGR exhaust gas flow into the intake passageway via a mixer ejector which is provided with mixer lobes and a diffuser downstream of the lobes. The mixer ejector enhances the momentum transfer from the intake flow to the exhaust flow, and in this way, the static pressure of the exhaust flow at the entrance to the mixing region is decreased, thereby increasing the differential pressure across the EGR tube and increasing the exhaust flow. In a second embodiment, in addition to, or instead of, using the special ejector construction of the first embodiment, an ejector pump is located in the EGR tube. The ejector in the EGR tube is connected to the vehicle air system compressor or turbocompressor and serves to pump the exhaust gases to the engine intake passageway. This embodiment enables a more precise controlling of the EGR rate to be obtained, and can provide more EGR flow that which could be obtained with an intake ejector or venturi alone.

대표청구항 ▼

An exhaust gas recirculation system for an internal combustion engine by which a portion of exhaust gases produced by the engine is recirculated from an exhaust line of the engine into an intake line of the engine, said exhaust gas recirculation system comprising an exhaust gas recirculation line co

An exhaust gas recirculation system for an internal combustion engine by which a portion of exhaust gases produced by the engine is recirculated from an exhaust line of the engine into an intake line of the engine, said exhaust gas recirculation system comprising an exhaust gas recirculation line connecting the exhaust line of the engine to the intake line of the engine, a pressure differential means for drawing a secondary flow from said recirculation line into a primary flow in said intake line, and an ejector connected to a source of high pressure air, said ejector having a discharge end disposed in said recirculation line.