Patent ID: 8548700

Claim:
A control system for controlling an automatic transmission that is mounted in a motor vehicle and receives a torque from an engine through a torque converter, the automatic transmission being capable of establishing a given speed stage by engaging a given frictional element, the control system comprising: an actual time lag measuring section that measures an actual time lag from a time when a speed change instruction for the given speed stage is issued to a time when a gear ratio of the automatic transmission starts to change for establishing the given speed stage; a torque detecting section that detects the torque from the engine; a time lag map that provides a suitable time lag in accordance with the detected torque from the engine; a learning correction section that corrects, by learning control, an instruction value for a hydraulic pressure led to the frictional element so as to cause the actual time lag to have the same value as the suitable time lag; and a time lag map correcting section that corrects the suitable time lag in accordance with an operation condition of the vehicle.