Patent ID: 7765805

Claim:
A method for operating a supercharging system for an internal combustion engine including an exhaust gas propelled turbo supercharging system, a mechanical supercharging system, and an electrical supercharging/regenerating system, wherein, said exhaust gas propelled turbo supercharging system includes a turbine and a compressor, said compressor being arranged on a compressor shaft, said mechanical supercharging system coupling a crank shaft of the engine to said compressor, and said electrical supercharging/regenerating system coupling an electric motor to said compressor, said exhaust gas propelled turbo supercharging system, mechanical supercharging system, and electrical supercharging/generating system are arranged on a common axis including said compressor shaft and a drive shaft, said compressor shaft and said drive shaft being connected via a planet gear, which electric motor/generator is connected to said drive shaft and a power transmission connects a crankshaft of the internal combustion engine to said drive shaft via an one way clutch unit, comprising the steps of: operating the supercharger/regenerating system in a first operating mode where said compressor in the supercharger/regenerating system is driven from said crankshaft and before said turbine has reached a speed of working area; operating the supercharger/regenerating system in a second operating mode where said compressor in the supercharger/regenerating system is driven from said turbine, wherein said generator receives power from said turbine when said turbine generates an excessive energy; and operating the supercharger/regenerating system in a third operating mode where said compressor in the supercharger/regenerating system is driven from said electrical motor, wherein when the internal combustion engine is operating in at least one of at low engine speeds and fast speed transients, the electric motor is generated to maintain boost pressure of compressed air to be delivered into said internal combustion engine.