Valve timing control system for internal combustion engine

摘要

There is provided a valve timing control system for an internal combustion engine, which is capable of suitably controlling a hydraulic pressure control valve 10 for control of a cam phase irrespective of a temperature condition of a coil 100 of the control valve 10, thereby enhancing the accuracy of feedback control of the cam phase. The control valve 10 drives a cam phase change mechanism 8 according to an amount of current flowing through the coil 100. An ECU 2 feedback-controls a provisional duty factor DOUTVT for controlling the amount of current such that an actual cam phase CAIN becomes equal to a desired cam phase CAINCMD. The ECU 2 sets a desired current amount VTCIOBJ based on the provisional duty factor obtained by the feedback control. The ECU 2 feedback-controls an output duty factor DDOUT for control of the amount of current supplied to the control valve 10 such that an actual current amount VTCIACT becomes equal to a desired current amount VTCIOBJ.