Why do you need to match the double clutch?

Mainly to make the engine speed more consistent with the speed required by the selected gear, so as to make the internal gearbox gear more matched. Stepping on the two-foot clutch when shifting gears is a control method of classic cars. Because there was no synchronizer in the vehicle gearbox at that time. So as to rotate the input gear and the output gear as much as possible. In this neutral range, the accelerator or accelerator pedal can realize the smooth transition of gears.