Control device and control method for power train

A control device for a power train provided with:

• a differential mechanism having a first rotating element coupled with a rotor of a first rotating electric machine, a second rotating element coupled with a rotor of a second rotating electric machine, and a third rotating element coupled with an output shaft of an engine;
• and
• a transmission mechanism coupled with said second rotating element and transmitting torque inputted from said second rotating element to a wheel,
• said control device comprising:
• an idle speed control portion for controlling an engine rotation speed when said engine is in an idle operation;
• a learning control portion for implementing a learning control in order to correct a set amount of engine control by said idle speed control portion based on an actual engine rotation speed during said idle operation;
• and
• a rotation lock control portion for controlling power supply to said second rotating electric machine so that rotation of the rotor of said second rotating electric machine is locked by an electromagnetic force generated in said second rotating electric machine when said learning control is implemented at a time of selection of a predetermined shift position in which said second rotating element is not engaged with another rotating element in said transmission mechanism.