Patent ID: 7900533

Claim:
A controller of an automatic transmission, wherein the controller includes a first control mode and a second control mode for controlling a transmission gear ratio of the automatic transmission device, wherein the controller automatically changes the transmission gear ratio when in the second control mode, wherein the automatic transmission is mounted in a vehicle, wherein the vehicle has an internal combustion engine, an axle, and an operation member, and the internal combustion engine has an engine output shaft, wherein the automatic transmission has a transmission output shaft, wherein the controller obtains an index value and upper limit speed of rotation speed of the transmission output shaft, wherein the automatic transmission is provided between the engine output shaft and the axle, wherein, in the first control mode, the controller allows the transmission gear ratio to be changed if the operation member is operated to increase the transmission gear ratio and the index value is equal to or smaller than the upper limit speed, wherein the controller has a setting section for setting the upper limit speed, and wherein, when the controller is in the first control mode and the operation member is operated to increase the transmission gear ratio, the setting section detects vehicle acceleration of the vehicle and sets the upper limit speed to be greater as the vehicle acceleration becomes smaller.