TURBOCHARGING SYSTEM OF INTERNAL COMBUSTION ENGINE

A supercharging system comprising a pressure wave supercharger (20) which supercharges an internal combustion engine (1) by increasing a pressure of gas in a cell (23) using a pressure wave of exhaust gas and discharging from an intake gas outlet port (28b, 25) to an intake gas passage (3) the gas pressurized further comprises a first motor (29) which rotates a rotor (22), and a valve plate (28) and a second motor (30) capable of changing a position of the intake gas outlet port (28b) with respect to an exhaust gas inlet port (26) . The motors (29, 30) are controlled so as to change a rotation number of the rotor (22) and the position of the intake gas outlet port (28b) with respect to the exhaust gas inlet port (26) based on a quantity of flow of exhaust gas to be recirculated to the intake gas passage (3).