METHOD AND SYSTEM FOR CONTROLLING CONTINUOUSLY VARIABLE VALVE TIMING

A method for controlling continuously variable valve timing (CVVT), may include determining whether a CVVT control is started, detecting a position of a cam and a position of a crankshaft when the CVVT control is started, determining whether it is required to identify whether a cam torque is positive or negative based on the positions of the cam and crankshaft, determining whether the cam is controlled to be positioned from a locking position to an advancing position or a holding position, when it is required to identify whether the cam torque is positive or negative, and when the cam is controlled to be positioned from a locking position to an advancing position or a holding position and when a condition for performing the CVVT control is satisfied, determining whether the cam torque is negative and performing predetermined CVVT control after waiting a predetermined time when the cam torque is negative.