Control device of vehicle power transmission device

A control device of a hybrid type vehicle power transmission device having a prime mover and an electric motor each coupled to a drive shaft in a power transmittable manner, comprising:

• a slow change processing means, when any of a torque of the prime mover and a torque of the electric motor changes and passes through zero, slowly changing the torque at a change rate set in advance for suppressing gear rattling noise;
• and
• a torque compensating means, if the slow change processing means slowly changes the torque of one of the prime mover and the electric motor, compensating a shortage of the torque of the drive shaft occurring due to the slow change with the other torque not slowly changed, wherein
• the prime mover is a first electric motor coupled in a power transmittable manner to a rotating element of a differential mechanism having an input shaft coupled to an engine, wherein
• the electric motor is a second electric motor coupled in the power transmittable manner to an output shaft of the differential mechanism, wherein
• the torque compensating means is implemented while the engine is in operation, wherein
• if it is determined that the torques of both the first electric motor and the second electric motor change and pass through zero during the torque control of the drive shaft, the slow change processing means makes an adjustment such that the timing of slowly changing the torque of the first electric motor does not overlap the timing of slowly changing the torque of the second electric motor.