What is the working principle of the lock-up clutch?

[WilliamRose]

The working principle of the lock-up clutch is: The engagement and disengagement of the lock-up clutch are controlled by the electronic control unit through the lock-up solenoid valve. When the vehicle is driving on poor road surfaces, the lock-up clutch can be disengaged to allow the torque converter to function, fully leveraging the advantages of hydraulic transmission in automatically adapting to drastic changes in driving resistance. When the vehicle is driving on good roads, the lock-up clutch should be engaged to make the input and output shafts of the torque converter rigidly connected, thereby switching to direct mechanical transmission. The lock-up clutch consists of components such as the lock-up piston, damping plate, and turbine drive plate. The lock-up piston and damping plate are connected by splines and can move back and forth, while the damping plate and turbine drive plate are connected via damping springs to attenuate torsional vibrations during the engagement of the lock-up clutch.