VALVE OPENING AND CLOSING CONTROL APPARATUS

PROBLEM TO BE SOLVED: To set a relative rotation angle between a drive side rotating body (outer rotor) and a driven side rotating body (inner rotor) of an intake valve at the most delayed angle to stabilize the relative rotation angle in starting an engine.SOLUTION: When the engine is to be automatically stopped, a relative rotation angle between the drive side rotating body 11 and the driven side rotating body 12 is set at the most delayed angle, thereby setting a most delayed angle locking mechanism L1 in a locked state. When the engine is automatically started thereafter, the relative rotation angle is restrained at the most delayed angle since cranking starts until the set timing is reached. After the set timing is reached, a working fluid of an accumulator 27 is supplied, thereby unlocking the most delayed angle locking mechanism L1. In addition, the working fluid of the accumulator 27 is supplied to an advance chamber Ca to transit the relative rotation angle in an advancing direction, so as to transit to a locked state by an intermediate locking mechanism L2.