1. A hybrid system of an internal combustion engine ( 1 ) comprising: at least one charging device ( 6 ) with a turbine ( 7 ) connected to a compressor ( 8 ) via a compressor shaft ( 9 ), the compressor having a high speed shaft ( 30 ); a planetary gear ( 25 ) coupled between the high speed shaft ( 30 ) and an electric motor/generator ( 20 ); at least one clutch; wherein the at least one clutch includes a first clutch ( 18 a ), a second clutch ( 18 b ), and a third clutch ( 18 c ); a power transmission connecting a crank shaft ( 4 ) of the combustion engine ( 1 ) to the electric motor/generator, ( 20 ) via the first clutch ( 18 a ); at least one of an engine controller ( 28 ) and a vehicle controller ( 29 ) arranged to determine at least one of input parameters including an engine speed (rpm), an engine throttle position, and a driver pedal position, and an electronic control system ( 23 ) configured to operate the hybrid system in a plurality of different operating modes according to a control sequence based on the at least one of said input parameters including the engine speed (rpm), the engine throttle position, and the driver pedal position; wherein the plurality of said different operating modes comprising: an operating mode A where the electric motor drives auxiliary loads of the internal combustion engine ( 1 ); an operating mode B where the electric motor starts, or stops, the internal combustion engine ( 1 ); an operating mode C where the electric motor propels the vehicle; and an operating mode D where brake energy from retardation of the vehicle is regenerated to electrical energy.