Patent ID: 8068963

Claim:
A control device for an automatic transmission capable of operating in an automatic shift mode in which a gear ratio is automatically selected based on driving conditions of a vehicle, and also capable of operating in a manual shift mode in which the gear ratio is changed based on an upshift command or a downshift command by manual operation of a manual operation device, the control device comprising: a road gradient determination unit that determines a road gradient during driving; and a manual shift control unit that changes and sets the gear ratio after downshift depending on road conditions when the downshift command has been operated by the manual operation device in the manual shift mode, and performs the downshift to the gear ratio that has been changed and set, wherein: the manual shift control unit includes a road gradient reflecting unit that changes and sets the gear ratio after downshift depending on the road gradient serving as the road condition, a gear ratio width between before and after the downshift is made larger as the road gradient becomes larger, the manual shift control unit stores road gradient reflecting maps each of which, for each gear ratio before downshift, preliminarily stores gear ratios after downshift corresponding to road gradient and vehicle speed, and the manual shift control unit obtains the vehicle speed, and changes and sets the gear ratio width based on the road gradient, the vehicle speed and the road gradient reflecting maps.