On vehicles equipped with lock-up converters, when does the clutch unlock?

In vehicles equipped with lock-up converters, the clutch is designed to unlock under several specific conditions to optimize performance and efficiency. Heavy vehicle acceleration requires higher engine RPMs and torque, which can lead to increased slippage if the clutch remains engaged. Therefore, during heavy acceleration, the clutch will unlock to allow the engine to rev more freely while providing the necessary power without straining the transmission.

When the vehicle shifts into passing gear, or when the driver accelerates to pass another vehicle, a higher power demand is created. In this situation, the clutch also unlocks to accommodate the increased engine performance needed to respond quickly and effectively.

Coasting corresponds to a scenario where the vehicle is not under acceleration, and the engine is entering a deceleration mode. In this case, it may also be necessary for the clutch to unlock to ensure smoother transitions and avoid potential engine strain.

As these scenarios can all occur during various driving conditions, the clutch unlocks in each of them to ensure optimal vehicle performance, fuel efficiency, and mechanical longevity. Therefore, it is accurate to conclude that the clutch unlocks during heavy vehicle acceleration, in passing gear, and in a coast condition, making the comprehensive choice correct.