Control apparatus and method of automatic transmission

A control apparatus of an automatic transmission including a plurality of planetary gear mechanisms and engaging mechanisms configured to establish a gear range by switching inputs/outputs of the plurality of planetary gear mechanisms, comprising:

• an oil pressure supply device configured to supply an oil pressure to operate the engaging mechanisms between an engaging state and a release state in which the engaging state is canceled;
• and
• a gear change controller configured to control an operation state of each of the engaging mechanisms of the planetary gear mechanisms to establish one gear range of a plurality of gear ranges,
• wherein the gear change controller calculates a temperature of each of the engaging mechanisms in the gear range after a gear change,
• calculates a cooling rate of each of the engaging mechanisms in the gear range after the gear change based on the temperature and the operation state of each of the engaging mechanisms,
• calculates an allowable temperature of each of the engaging mechanisms in the gear range after the gear change based on the cooling rate of each of the engaging mechanisms, and
• executes gear change control of restricting the gear change to the gear range in a case in which the temperature of each of the engaging mechanisms in the gear range after the gear change is predicted to be not less than the allowable temperature.