To enlarge a premixed compression ignition region and to reduce both fuel consumption and noxious components in exhaust gas.
The invention relates to the control device of a self ignition type internal combustion engine, which controls a combustion condition of the self ignition type internal combustion engine so that it is switched between spark ignition and premixed compression ignition. This control device is characterized in provided with a supercharging means, a rotating speed changing means, a region determining means, a combustion controlling means for controlling the combustion condition of the self ignition type internal combustion engine so that it is switched between the spark ignition and the premixed compression ignition in accordance with a determination result of the region determining means, and a rotating speed control means for setting, when the region determining means determines that it is in a premixed compression ignition possible region, a target supercharging pressure of the supercharging means based on combustion chamber temperature, engine rotating speed and torque of the self ignition type internal combustion engine and for controlling the rotating speed changing means so that the supercharging means is rotated at a rotating speed for attaining the target supercharging pressure.
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