Charging system for a combustion engine

摘要

The system has a set of exhaust gas turbochargers connected with an electrical machine (M) and provided with a variable turbine stator geometry. One of the turbochargers is not connected with the electrical machine and provided with the geometry. A subset of the turbochargers is coupled with the electrical machine and provided with the geometry. The other turbochargers are not coupled with the electrical machine and provided with the geometry. An exhaust-gas catalytic converter is arranged before or after a turbine.