Control device of automatic transmission

A control device of an automatic transmission,

• wherein the automatic transmission comprises:
• an input shaft to which a drive force is input;
• an output member that outputs the drive force;
• a plurality of planetary gear mechanisms that transmit the drive force input from the input shaft to the output member;
• and
• a plurality of hydraulic friction engagement mechanisms capable of establishing a plurality of shift stages by switching a transmission path of the drive force in the plurality of planetary gear mechanisms,
• wherein the plurality of shift stages comprise:
• at least one forward range that is establishable when the plurality of hydraulic friction engagement mechanisms are in a first state;
• and
• a reverse range established when the plurality of hydraulic friction engagement mechanisms are in a second state,
• wherein the control device comprises:
• a detection part that detects a shift position;
• and
• a control part that controls the plurality of hydraulic friction engagement mechanisms,
• wherein switching control for switching the plurality of hydraulic friction engagement mechanisms from one of the first state and the second state to the other is executable when the detection part detects that the shift position has been switched from one of the forward range and the reverse range to the other, and
• wherein each of the plurality of hydraulic friction engagement mechanisms has a corresponding hydraulic pressure command value, such that there are a plurality of hydraulic pressure command values, and
• in the switching control,
• for the hydraulic friction engagement mechanisms that do not change an engaged state between the forward range and the reverse range, a hydraulic pressure command value is fixed and
• for the hydraulic friction engagement mechanisms that change the engaged state between the forward range and the reverse range, a hydraulic pressure command value of a respective hydraulic friction engagement mechanism is determined based on a hydraulic pressure supplied to the respective hydraulic friction engagement mechanism.