| 摘要 |
An exhaust gas recirculation (EGR) system (10) for a turbo-charged internal combustion engine (12) is provided. The EGR system (10) includes a recirculation conduit (34) for recirculating a volume of exhaust gas from the exhaust manifold (16) to the intake manifold (14); a bypass conduit (36) for diverting a flow of intake air around the engine (12); and an EGR cooler (38) disposed in operative association with the recirculation conduit (34) and the bypass conduit (36) and adapted for cooling the volume of recirculated exhaust gas in the recirculation conduit (34). The exhaust gas recirculation cooler (38) or heat exchanger is also adapted for concurrently heating the intake air in the bypass conduit (36). The heated intake air together with the exhaust gas remaining in the exhaust manifold is used to drive the turbocharger (18). The disclosed embodiment of the exhaust gas recirculation system (10) also includes an air-to-air after-cooler (20) used to cool the compressed intake air. The cool, compressed air is then diverted to the exhaust gas recirculation cooler (38) to cool the recirculated exhaust gas. <IMAGE> |
