Control device for variable valve mechanism

A control device of a variable valve mechanism, the variable valve mechanism having a motor that varies an actuation parameter of a valve of an internal combustion engine, a rotational angle of the motor being restricted to a set angular range, the control device detecting a current value of the valve actuation parameter based on the motor rotational angle, the control device comprising:

• a position sensor that outputs a pulse signal when the motor rotates;
• a position counter that calculates a position counter value by counting edges of the pulse signal;
• a detecting portion, wherein when in a powered state, the detecting portion obtains a detection value of the motor rotational angle based on the counter value;
• and
• a determining portion that detects an operating state of the engine and the powered state of the detecting portion, wherein when detecting that the engine is operating and the detecting portion is in a non-powered state, the determining portion determines that the detection value of the motor rotational angle is displaced from the actual value.