SYSTEME DE SURALIMENTATION A DOUBLE ETAGE AVEC DISPOSITIF D'EPURATION DE GAZ D'ECHAPPEMENT POUR MOTEUR A COMBUSTION INTERNE ET PROCEDE POUR COMMANDER UN TEL SYSTEME

摘要

The system (20) has a high pressure supercharging stage formed by a high pressure turbo-compressor (22). The turbo-compressor has an expansion turbine (26) connected to a compressor (30). An exhaust gas purification unit i.e. precatalyst (92), is placed between an exhaust gas outlet (40) and the expansion turbine. An exhaust gas derivation branch (70) derives the exhaust gas starting from the outlet and reaching an expansion turbine (28) of a low pressure turbo-compressor (24) of a low pressure supercharging stage. An independent claim is also included for a method for controlling a double-stage supercharging system.