Method of controlling double clutch transmission of vehicle

A method of controlling a double clutch transmission of a vehicle to conduct a series of downshifting operations from a preceding gear to a subsequent gear via a current gear in response to deceleration of the vehicle, the method comprising:

• engaging a clutch at the preceding gear, wherein the clutch controls transmission of power to an input shaft connected to the shift gear of the preceding gear;
• releasing the preceding gear by releasing a shift gear of the preceding gear while the clutch, is in an engaged state with a constant torque level from before the downshifting from the preceding gear to current gear, and
• shifting gears to the subsequent gear by releasing the clutch from the engaged state from the preceding gear, and engaging a shift gear of the subsequent gear.

A method of controlling a double clutch transmission of a vehicle to conduct a series of downshifting operations from a preceding gear to a subsequent gear via a current gear in response to deceleration of the vehicle, the method comprising:

• controlling a clutch connected to an input shaft pertaining both to the preceding gear and the subsequent gear such that the clutch is continuously maintained in an engaged state with a constant torque level just before a shift gear of the subsequent gear is engaged via the current gear.