CONTROL UNIT AND CONTROL METHOD FOR VARIABLE VALVE TIMING MECHANISM, PROGRAM FOR IMPLEMENTING THE CONTROL METHOD, AND RECORDING MEDIUM ON WHICH THE PROGRAM IS RECORDED

摘要

An electronic control unit (100) for a variable valve timing mechanism (2000, 3000) is disclosed that changes a valve phase of at least one of an intake valve (1100) and an exhaust valve (1110) within a first range from a first phase that is a most retarded phase to a second phase that is a most advanced phase by changing a phase of a camshaft (1120, 1130) with respect to an output shaft (1090) of an internal combustion engine (1000). The electronic control unit (100) comprises a detector (5010) that detects the valve phase; a first phase control unit (110) that executes a control for bringing the valve phase to the first phase, when the internal combustion engine (1000) is stopped; a learning unit (140) that learns the valve phase detected by the detector, when the valve phase is controlled to the first phase; and a second phase control unit (120) that executes a control for changing the valve phase within a second range included in the first range and that does not include the first phase, when the internal combustion engine (1000) is operating.