Lock-Up Control

SYSTEM

LOCK-UP CONTROL : System Description


SYSTEM DIAGRAM







DESCRIPTION

- The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to increase power transmission efficiency.
- The engagement/release of the lock-up clutch is operated by the lock-up control valve by switching the operating hydraulic pressure feed circuit to the lock-up piston chamber.
Revision: March 20122013 Infiniti JX
The switching of the lock-up control valve is operated by the torque converter clutch solenoid valve according to the drive signal from the TCM.
- If the CVT fluid temperature is low or the vehicle is in fail-safe mode due to malfunction, lock-up control is prohibited.
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 valve 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 valve and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.