Patent ID: 8006495

Claim:
A supercharging system for an internal combustion engine comprising: a supercharger equipped with an electric motor that performs supercharging utilizing the energy of the exhaust gas of the internal combustion engine mounted on a vehicle, wherein rotation of the rotary shaft of the supercharger is selectively assisted by the electric motor; and a control unit for controlling assisting force of said electric motor in such a way that the rotation speed of the supercharger becomes a target rotation speed, wherein said control unit determines the target rotation speed of said supercharger based on the degree of opening of an accelerator provided on said vehicle or on the degree of opening of the accelerator and the rotation speed of the internal combustion engine and controls said assisting force in such a way that the target rotation speed is attained, and said control unit detects a knocking intensity occurring in a cylinder of the internal combustion engine and corrects said target rotation speed based on the knocking intensity.