Lock-Up and Select Control

LOCK-UP AND SELECT CONTROL
^ The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to increase power transmission efficiency.
^ The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid valve, which is controlled by a signal from TCM. The torque converter clutch control valve engages or releases the torque converter clutch piston.
^ When shifting between N (P) ⇔ D (R), torque converter clutch solenoid controls engagement power of forward clutch and reverse brake.





^ The lock-up applied gear range was expanded by locking up the torque converter at a lower vehicle speed than conventional CVT models.

TORQUE CONVERTER CLUTCH AND SELECT CONTROL VALVE CONTROL





Lock-up and select control system diagram

Lock-up released
^ In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the torque converter clutch solenoid and the lock-up apply pressure is drained. In this way, the torque converter clutch piston is not coupled.

Lock-up applied
^ In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque converter clutch solenoid and lock-up apply pressure is generated. In this way, the torque converter clutch piston is pressed and coupled.

Select control
^ When shifting between N(P) <==> D(R), optimize the operating pressure on the basis of the throttle position, the engine speed, and the secondary pulley (output) revolution speed to lessen the shift shock.
^ Switch lock-up control or select control with torque converter clutch solenoid valve to switching select valve switch with lock-up select solenoid valve.