Patent ID: 8909455

Claim:
A control device for an internal combustion engine, comprising: a camshaft of the internal combustion engine; a plurality of plane cam shape portions, which are provided to the camshaft, respectively have valve lift characteristics different from each other, respectively have cam faces parallel to a rotation axis of the camshaft, and are spaced apart from each other; at least one transitional shape portion, which is provided between adjacent plane cam shape portions so as to be integral with the two plane cam shape portions and has a curved cam face connecting the cam faces of the adjacent plane cam shape portions so as to be continuous with the cam faces; a cam switching mechanism, which is configured to switch a cam between the valve lift characteristics for an intake valve by selecting one of the plurality of plane cam shape portions via the transitional shape portion; a cam position sensor, which is configured to sense which position of the cam faces and the curved cam face in a rotation axis direction of the camshaft drives the intake valve; and a control unit, which is configured to make a plane cam portion controlled variable for the internal combustion engine in a case where the cam face drives the intake valve and a transitional portion controlled variable for the internal combustion engine in a case where the curved cam face drives the intake valve different from each other on the basis of a sensing result from the cam position sensor.