Note: The gearbox type is stamped on the aluminum plate attached to the engine compartment bulkhead, in the line "TRANS / AXLE".
Planetary gearbox.
The planetary gearbox contains two planetary gear sets, three locking clutches and two disc brakes.
Power from the engine is transmitted through the torque converter to the input shaft of the planetary gearbox.
Gear shifting is accomplished by engaging a specific combination of two controls, which changes the output shaft speed.
Hydraulic control system
The hydraulic control system consists of an automatic transmission pump, an automatic transmission fluid cooler, a control valve block, hydraulic accumulators, clutches and brakes.
The article is borrowed from the website: www.hyundaibook.ru
The main pressure in the system is created by the pump, it is regulated depending on the load and speed of the vehicle and ensures the operation of the torque converter, clutches and brakes.
The shift valves in the valve block control the flow of working fluid that enters the torque converter and planetary gearbox.
Electronic control system
The electronic control system includes sensors of external electronic systems (throttle position sensor, coolant temperature sensor, etc.), various sensors on the gearbox (input and output shaft speed sensors, automatic transmission working fluid temperature sensor, vehicle speed sensor, etc.), control switches, an electronic automatic transmission control unit, electromagnetic valves for controlling the flow of working fluid in the hydraulic system (located on the control valve block).