The very first automotive software of the lock-up principle was Packard's Ultramatic transmission, introduced in 1949, which locked up the converter at cruising speeds, unlocking once the throttle was floored for fast acceleration or as the car or truck slowed. Torque converter equations of movement are governed by Leonhard Euler's https://torqueconverterclutch19741.tkzblog.com/33775955/fascination-about-torque-converter-clutch