Gear shifting is accomplished by engaging a specific combination of controls that changes the output shaft speed.
Hydraulic part of the control system
The control system includes: a pump, hydraulic accumulators and couplings.
The main pressure in the system is created by a pump, it is regulated depending on the load and vehicle speed, and ensures the operation of the torque converter and lock-up clutches.
Shift valves control fluid flow to the torque converter and transmission.
Electrical part of the control system
The electrical control system for the automatic transmission provides extremely precise control of the shift and torque converter lock-up timing depending on the driving conditions and engine operation. In addition, the use of an electric control system can significantly improve the quality of gear shifting.
The electrical part of the automatic transmission control system consists of three parts:
- A) Sensors that determine the parameters of the state of the car, and transmit this data to the electronic control unit.
- b) A control unit that detects shift points and controls the torque converter lock-up clutch.
- V) The executive part, which consists of solenoid valves.