Control apparatus for variable valve actuation system and control method for variable valve actuation system

A variable valve actuation system control apparatus that controls a variable valve actuation system capable of changing a valve characteristic of an engine valve by using an actuator whose movement range is a range between a first end and a second end at both of which movement of the actuator is mechanically stopped, the control apparatus comprising

• a control section that determines that a fixation is present on a condition that an actual amount of movement of the actuator in response to a movement command A for movement toward one of the first end and the second end that is issued when a present position of the actuator is unknown is less than or equal to a prescribed movement criterion value a, and that the actual amount of movement of the actuator in response to a movement command B that is output subsequently to the movement command A in order to cause movement of the actuator in a direction opposite to the direction of the movement caused in response to the movement command A is less than or equal to a prescribed movement criterion value b.