Patent ID: 7882820

Claim:
A control apparatus of an internal combustion engine in which a plurality of cylinders is divided into a first cylinder group and a second cylinder group, comprising: a supercharger that is formed of an exhaust driven supercharger, and a turbine of the exhaust driven supercharger is provided only in an exhaust passage of the first cylinder group; and a controller that selectively switches the internal combustion engine between operating in a partial cylinder operation mode in which only one of the first cylinder group and the second cylinder group is operated, and operating in a full cylinder operation mode in which both the first cylinder group and the second cylinder group are operated, as well as selectively starts and stops operation of the supercharger depending on a load on the internal combustion engine when the internal combustion engine is to be operated in the partial cylinder operation mode, wherein: the controller operates only the first cylinder group when the internal combustion engine is to be operated in the partial cylinder operation mode with supercharging; the controller operates only the second cylinder group when the internal combustion engine is to be operated in the partial cylinder operation mode with natural aspiration; and the controller controls an air-fuel ratio of the first cylinder group according to the load on the internal combustion engine when the internal combustion engine is to be operated in the partial cylinder operation mode with supercharging.