Overview for DCT

DCTs are virtually a combination of two AMTs in the same vehicle: one sub-transmission realizes the odd gears, while the other one realizes the even gears. Only one of the sub-transmissions is active at a time transmitting the full engine torque, while the gear in the other sub-transmission can be shifted.

Shifting from an odd gear to an even gear or vice versa is actually not a gearshift. Since the new gear has already been shifted in the inactive sub-transmission, it is only opening the clutch of the active sub-transmission and closing the clutch of the inactive one at the same time, ensuring continuous power flow towards the vehicle wheels.

Therefore a DCT can be shifted sequentially (one-by-one) without torque interruption, just like an AT.

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