Patent ID: 8584459

Claim:
A forced induction system for an internal combustion engine with a crankshaft, said system comprising: a compressor for increasing the pressure of gas into said internal combustion engine; a turbine mechanically decoupled from the compressor and arranged to be driven by engine exhaust gas; a generator arranged to be driven by said turbine at a first rotational speed and to generate an electrical signal output with a first frequency; an electric motor arranged to drive said compressor, wherein said generator and said motor are electrically coupled; and a control arranged to receive said electrical signal output by said generator during operation and to apply an alternating current control signal with a second rotational speed, independently of the first rotational speed of said generator whereby said compressor is driven at least in part by an output torque of the turbine via said electrical coupling, wherein the control comprises a frequency modulator arranged to control the flow of electricity between the generator and the electric motor.