Internal combustion engine with turbocharger

摘要

The invention relates to cooling the turbocharger after the engine has been shut off. The engine (202) has a two-stage air charge boosting system including an exhaust gas driven turbocharger (220) for compressing inlet air, an electrical supply system (230), an air passageway between (265) the air inlet system (205) and the exhaust gas system (211), and a controller (240) for controlling the operation of the air charge boosting system (218,220). The turbocharger (220) has an exhaust gas driven impeller (226). The air charge boosting system includes an electrically driven supercharger (18). The controller (240) is arranged when the engine (202) is stopped to operate the supercharger (218) to force air (260) through the air passageway (265) from the air inlet system (205) into the exhaust gas system (211) in order to cool the turbocharger impeller (226). The air passageway (265) is preferably provided by an exhaust gas recirculation system (80).