SUPERCHARGING SYSTEM INCLUDING TWO TURBOCHARGERS AND A DUAL PERMEABILITY VALVE

摘要

The invention relates to a supercharging system (1) for a compression ignition engine, that comprises first (T1, C1) and second (T2, C2) turbochargers mounted parallel and providing a three-mode operation, one using the first turbocharger (T1, C1) only, the second using the two turbochargers (T1, C1, T2, C2) and the third corresponding to a transition phase between the above two modes, wherein said system (1) includes a means for selecting an operation mode based on the engine charge and speed (2). The supercharging system of the invention is mainly characterised in that it comprises a regulator (18) for adjusting the supercharging pressure, provided on the first turbine, and a flow regulator for the second turbine in the form of a dual-permeability valve, wherein said valve is capable of isolating the second turbine in a single turbocharger mode, of accelerating said second turbine in the transition mode, and of supplying the same with gas with minimal charge losses in a dual-turbocharger mode.