What is the control system of automatic transmission?

The automatic transmission control system is an automobile transmission that automatically changes the transmission ratio when the vehicle is running, so that the driver does not have to manually shift gears. Other information about automatic transmission is as follows: 1. The automatic transmission control system consists of hydraulic signal device, shift quality control device and hydraulic torque converter control device. 2. The speed and throttle position sensors are used to convert the vehicle speed and throttle opening into electrical signals and input them to the electronic controller ECU. 3.ECU compares and calculates the shift point and locking time of the torque converter locking clutch according to the pre-programmed shift program stored in the memory ROM, and sends a control signal to the solenoid valve to control the on-off of the solenoid valve coil current. 4. The solenoid valve controls the action of the hydraulic shift valve and switches the oil circuit of the shift actuator (shift clutch and brake) to realize automatic shift.