Turbocharged diesel engine with long-route EGR and an auxiliary intake compressor

摘要

A turbocharged Diesel engine (1) comprises a main compressor 40 located in the intake pipe 2 and driven by a turbine 41 located in the exhaust pipe 3; a long-route exhaust gas recirculation (LR-EGR) conduit 60 fluidly connected between a point 32 of the exhaust pipe 3 downstream the turbine 41 to a point 22 of the intake pipe 2 upstream the main compressor 40, and an auxiliary compressor 70 located in the intake pipe 2 downstream the linking point 22 of the intake pipe 2 with the LR-EGR conduit 60. The auxiliary compressor 70 may be driven electrically. A bypass conduit 71 around the auxiliary compressor 70 may have a bypass valve 72 that is opened when the auxiliary compressor 70 is activated. The auxiliary compressor 70 may be activated when engine load increases. A short-route EGR conduit 50 may also be provided.