Control device for automatic transmission

A control device for an automatic transmission, wherein the automatic transmission is mounted between a vehicle driving source and a driving wheel, and has a plurality of gear positions, the control device comprising:

• a transmission controller structured to control shifting of the automatic transmission, wherein the transmission controller includes:
• a failure diagnosis section configured to diagnose whether or not a failure has occurred in a shift control system of the automatic transmission;
• a fail-safe control section configured to fix the automatic transmission into a predetermined one of the gear positions in response to confirmation of the failure of the shift control system of the automatic transmission;
• and
• an oil temperature rise regulation torque reduction control section configured to output a torque reduction request to suppress torque of the vehicle driving source, based on temperature of transmission operating oil of the automatic transmission;
• wherein the oil temperature rise regulation torque reduction control section is configured to output the torque reduction request in response to satisfaction of an oil temperature condition, wherein the oil temperature condition is set lower in oil temperature when the automatic transmission is fixed in a first gear position by the fail-safe control section than when the automatic transmission is not fixed in the first gear position.