Contemporary torque converters use electro hydraulic control for that lock-up clutch. The hydraulic circuit which locks/unlocks the torque converter clutch is managed employing hydraulic valves. The valves are actuated specifically or indirectly by solenoids. M (maximum efficiency issue): On this issue the torque converter hits its highest effectiveness as torque https://torque-converter-clutch25678.bloggazzo.com/33062615/facts-about-torque-converter-clutch-revealed