Patent ID: 7377245
Filing Date: 2008-05-27
Classification: F01L,F02D,F02N

Abstract:
1. A valve timing controller for an internal combustion engine, the valve timing controller being disposed in a system in which a torque of a crankshaft is transmitted to a camshaft, the valve timing controller adjusting a valve timing of at least one of an intake valve and an exhaust valve, comprising: an electric motor having a motor shaft and generating a cogging torque on the motor shaft; an current control means for controlling an electricity supplied to the electric motor, the current control means stopping supplying the electricity to the electric motor after an ignition switch is turned off to stop the engine; and a phase-changing mechanism connecting with the crankshaft and the camshaft, and varying a relative rotational phase between the crankshaft and the camshaft according to a rotation of the motor shaft, wherein the cogging torque has a peak value which is greater than an absolute value of a cam torque applied to the motor shaft from the camshaft through the phase-changing mechanism.