Patent ID: 8240279

Claim:
An engine valve control device applied to an engine valve control mechanism having a hydraulic actuator that varies a rotation phase of a camshaft with respect to a crankshaft to adjust opening-closing timings of an engine valve, a control valve that controls a flow of hydraulic oil supplied to the hydraulic actuator, and an electromagnetic solenoid that controls an operation of the control valve according to a control command value, the engine valve control device comprising: a control command value calculation means for calculating the control command value based on a holding value, which is a current value applied to the electromagnetic solenoid when the rotation phase does not change but is held, and a feedback correction value; a feedback correction means for calculating the feedback correction value in accordance with a deviation between an actual rotation phase and a target phase; and a learning means for determining the deviation to be a steady-state deviation when the deviation occurs continuously for a predetermined time and for correcting the holding value in accordance with the steady-state deviation, thereby performing learning for storing and updating the holding value, wherein if temperature of the hydraulic oil is lower than a predetermined threshold value, the learning by the learning means is prohibited even when the steady-state deviation is occurring.