CONTROL DEVICE OF VEHICLE POWER TRANSMISSION DEVICE

A control device of a vehicle power transmission device for the vehicle power transmission device including a line pressure regulating device regulating a hydraulic pressure of a hydraulic fluid discharged from an oil pump to a predetermined line pressure while changing an opening area of a discharge flow passage, and an automatic transmission having a predetermined gear position established by engagement of a hydraulic friction engagement element by using the line pressure as a source pressure, the control device comprising: an abnormality determination portion configured to detect a slip of the hydraulic friction engagement element establishing the predetermined gear position at the time of establishment of the predetermined gear position and, if an input torque at the time of occurrence of the slip is equal to or greater than an abnormality determination value defined in advance based on a torque transmittable at a minimum line pressure by the hydraulic friction engagement element establishing the predetermined gear position, to make an abnormality determination indicative of a possibility of an abnormality causing the output hydraulic pressure of the line pressure regulating device to be the minimum line pressure while the opening area of the discharge flow passage is maximized, the abnormality determination value being defined in accordance with a rotation speed of the oil pump such that the abnormality determination value becomes larger when the rotation speed is high as compared to when the rotation speed is low.