Patent ID: 8601810

Claim:
An internal combustion engine system, comprising: an internal combustion engine; an electric supercharger including: an exhaust turbine provided on an exhaust passage; a supercharger connected to the exhaust turbine through a rotary shaft; an electric motor connected to the rotary shaft; and a controller for controlling the electric motor, the electric supercharger being for compressing an intake air by rotation of the supercharger caused with rotation of the exhaust turbine by an exhaust gas energy to perform supercharging and for rotationally driving the supercharger with electric motor assistance by the electric motor; an exhaust bypass passage provided to bypass the exhaust turbine; an exhaust bypass valve being in the exhaust bypass passage; and a controller configured: to control the exhaust bypass passage valve to open when an operating state of the internal combustion engine is at a point where supercharging pressure is not required by the electric supercharger, to control the exhaust bypass valve to close when an operating state of the internal combustion engine is at a point where supercharging pressure is required by the electric supercharger, and to determine an amount of assistance by the electric motor and close the exhaust bypass passage in response to a throttle position of the engine.