Device and method for controlling internal combustion engine

A device comprising:

• an internal combustion engine controller for an internal combustion engine, the internal combustion engine comprising a variable compression ratio mechanism arranged to vary a relative position relationship between a piston and a cylinder, and thereby to vary a mechanical compression ratio, and a fuel injection valve arranged to directly inject a fuel within a combustion chamber in accordance with a fuel injection pulse width, and
• the internal combustion engine controller configured to control the mechanical compression ratio at an exhaust upper dead center to a low compression ratio in an engine high load region including a condition in which the fuel injection pulse width becomes maximum, to set a fuel injection start timing of the fuel in which an air-fuel mixture is formed within the combustion chamber, and which is ignited by an ignition plug, before the exhaust upper dead center, and to set a fuel injection end timing after an intake lower dead center so that the fuel injection valve is open continuously across the exhaust upper dead center and the intake lower dead center in the engine high load region from the fuel injection start timing to the fuel injection end timing.