The automatic transmission control system is composed of hydraulic signal device, shift control device, shift quality control device and hydraulic torque converter control device. The control system of electronically controlled automatic transmission also includes various sensors, actuators, electronic control units, etc.

Automatic transmission (English: Automatic Transmission, abbreviation: AT), also known as automatic transmission, Taiwan is called automatic transmission, Hong Kong is called automatic transmission, generally speaking, it is a kind of gear ratio that can automatically change when the vehicle is running The automobile transmission, so that the driver does not have to manually shift gears, is also used for large equipment railway locomotives.

The main task of the control system is to control the pump oil pressure of the oil pump to meet the working needs of the automatic transmission systems; realize automatic shifting according to the position of the control handle and the driving state of the car; control the circulation and cooling of the hydraulic oil in the torque converter, And to control the work of the lock-up clutch in the torque converter. The working medium of the control system is the hydraulic oil produced when the oil pump is running.