Patent ID: 8116952

Claim:
A control system for an automatic transmission capable of executing an automatic shift mode wherein a speed ratio is automatically selected based on a running state of a vehicle, and executing a manual shift mode wherein the speed ratio is changed based on an upshift command and a downshift command generated by manual operation of a manual operating unit, the control system comprising: a required power degree calculating unit for calculating a degree of power required by a driver based on a driving operation; a vehicle speed sensor that detects a vehicle speed; a required power degree reflecting map in which a post-downshift speed ratio corresponding to a degree of power required and a vehicle speed is stored in advance for each pre-downshift speed ratio; and a manual shift control unit that includes a required power degree reflecting unit for changing and setting a post-downshift speed ratio in accordance with the calculated degree of power required, the detected vehicle speed and the required power degree reflecting map, and that performs downshifting to the changed and set speed ratio while in the manual shift mode and during an operation of the downshift command generated by the manual operating unit.