Patent ID: 7980214
Filing Date: 2011-07-19
Classification: F01L

Abstract:
1. A control device for an electrically driven variable valve timing apparatus, which uses an electric motor as a drive source to change a rotational phase of a camshaft relative to a crankshaft and thereby to change valve timing of one of an intake valve and an exhaust valve in an internal combustion engine, the control device comprising: a controller for controlling power supply to the electric motor to change a rotational speed of the electric motor relative to a rotational speed of the camshaft and thereby to change the rotational phase of the camshaft relative to the crankshaft; and a motor rotation sensor for sensing stop and rotation of the electric motor; wherein the controller prohibits the controlling of the power supply to the electric motor until starting of rotation of the electric motor is sensed based on a result of the sensing of the motor rotation sensor, and the controller enables the controlling of the power supply to the electric motor when the starting of the rotation of the electric motor is sensed based on the result of the sensing of the motor rotation sensor.