CONTROL DEVICE OF AUTOMATIC TRANSMISSION

PROBLEM TO BE SOLVED: To provide a control device of an automatic transmission for securing high-quality driving of a plurality of clutch mechanisms, by highly accurately adjusting even initial pressure before branching off, without increasing cost.SOLUTION: A control device of an automatic transmission includes a shift group of forming a plurality of shift stages for converting a rotating speed when inputting-outputting power as two systems, and transmits the power by changing the rotating speed ratio. An automatic transmission body has hydraulic clutch mechanism 31 and 32 with each shift group for performing incorporation/separation into/from a power transmission passage, a hydraulic branch passage 52 for branching off operational hydraulic pressure with each clutch mechanism, a plurality of clutch solenoids 53 and 54 for adjusting supply hydraulic pressure with each clutch mechanism, and hydraulic sensors 55 and 56 for measuring the supply hydraulic pressure to the clutch mechanism. Hydraulic pressure information detected by the hydraulic pressure sensors by opening one clutch solenoid, is set as a measured value of the supply hydraulic pressure of a line solenoid 51 before branching off.