Patent ID: 8057357

Claim:
A power output apparatus constructed to output power to a driveshaft, the power output apparatus comprising: a motor arranged to allow heat exchange with at least part of a lubricating medium used for lubricating a portion of mechanical parts included in the power output apparatus and configured to output power to the driveshaft; a motor temperature detector arranged to detect a temperature of the motor; a medium temperature detector arranged to detect a temperature of the lubricating medium; a load factor setting module configured to set a load factor that is a ratio of an allowable torque actually output from the motor to a target torque to be output from the motor, in a case that the detected temperature of the motor is not more than a predetermined motor threshold temperature, so that the target torque is not limited but is output from the motor irrespective of the detected temperature of the lubricating medium, while setting the load factor, in a case that the detected temperature of the motor is more than the motor threshold temperature, in such a manner as to decrease more with the detected temperature of the motor being higher and in such a manner as to enlarge more a degree of decreasing with the detected temperature of the lubricating medium being higher; and a controller configured to control the motor so that a torque calculated as the product of the target torque and the load factor is output from the motor.