In automatic transmissions, a torque converter replaces a manual clutch. It connects the engine to the transmission using fluid instead of a direct mechanical link. This allows the engine to keep running when the car is stopped, and it multiplies torque at low speeds to help move the car more easily.

At higher speeds, however, this fluid connection can become less efficient — so lockup is used to mechanically connect the engine and transmission directly (like a clutch would), improving efficiency.

name

type

inputName

inputIndex

additionalEngineInertia

lockupClutchRatioName

lockupClutchTorque

lockupClutchSpring

lockupClutchDampRatio

couplingAVRatio

stallTorqueRatio

converterStiffness

converterDiameter

converterTorque

kFactorSmoothing

breakTriggerBeam