Control device for an internal combustion engine

A control device for an internal combustion engine, for changing a valve switching timing of at least one of an intake valve and an exhaust valve by changing a variable mechanism that enables continuous changing of a rotation phase of a cam shaft with respect to a crank shaft of the internal combustion engine by a hydraulically controlled solenoid valve through hydraulic driving,

• the control device comprising:
• a crank angle sensor for detecting a reference rotation position of the crank shaft;
• a cam angle sensor for detecting a reference rotation position of the cam shaft;
• real phase angle detecting means for detecting a real phase angle of the cam shaft based on a detection signal of the crank angle sensor and the cam angle sensor;
• target phase angle setting means including a temperature parameter and a battery voltage, for setting a target phase angle of the cam shaft based on an operating state of the internal combustion engine;
• and
• phase angle feedback control means for conducting a feedback control operation so that the real phase angle coincides with the target phase angle, and for calculating an operation quantity with respect to the hydraulically controlled solenoid valve,
• wherein the phase angle feedback control means sets an initial value of an integral term at a time of starting the phase angle feedback control operation based on the temperature parameter of the internal combustion engine, corrects a control correction quantity that has been calculated by the feedback control operation according to the battery voltage, and outputs the operation quantity with respect to the hydraulically controlled solenoid valve.