Patent ID: 8321099

Claim:
A control device for an automatic transmission in which a speed ratio between an input shaft connected to an engine side of a vehicle and an output shaft connected to a driving system of the vehicle is modified, the control device comprising: vehicle speed detecting means for detecting an actual vehicle speed, which is a traveling speed of the vehicle; vehicle speed estimating means for calculating a read-ahead vehicle speed, which is a target future vehicle speed at a predetermined time, based on the actual vehicle speed and an acceleration component speed; accelerator pedal opening angle detecting means for detecting an accelerator pedal opening angle; target gear shift ratio calculating means for calculating a target gear shift ratio based on the read-ahead vehicle speed and the accelerator pedal opening angle when the accelerator pedal opening angle is equal to or larger than a first predetermined value and for calculating the target gear shift ratio based on the actual vehicle speed and the accelerator pedal opening angle when the accelerator opening angle is smaller than a second predetermined value; and gear shift control means for controlling the automatic transmission based on the target gear shift ratio.