Patent ID: 7484497

Claim:
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.