Automatic transmission

An automatic transmission, comprising:

• a speed change mechanism including a gear mechanism that can attain a plurality of shift speeds, and a plurality of friction engagement elements that are selectively engaged to attain each shift speed in the gear mechanism;
• a hydraulic control device that can regulate engagement pressures to be supplied to hydraulic servos of the plurality of friction engagement elements and that can supply lubricating oil that lubricates the speed change mechanism;
• and
• a control unit that sends a command about the engagement pressures to the hydraulic control device to control engagement states of the plurality of friction engagement elements, wherein
• when a vehicle is in a non-driving state and a non-shifting state where the shift speed is maintained and an oil temperature is higher than a predetermined temperature, the control unit supplies an engagement pressure to a hydraulic servo of a friction engagement element being in an engaged state and maintaining the shift speed, and does not supply an oil pressure so as to disengage a different friction engagement element of the friction engagement elements, the different friction engagement element being different from the friction engagement element being in the engaged state, and
• when the vehicle is in the non-driving state and the non-shifting state where the shift speed is maintained and the oil temperature is the predetermined temperature or less, the control unit supplies the engagement pressure to the hydraulic servo of the friction engagement element being in the engaged state and maintaining the shift speed, and supplies an oil pressure so that the different friction engagement element different from the friction engagement element being in the engaged state is in a slipping state.