Control method for carrying out a gear shift in a transmission provided with a clutch gearbox

1) A control method to carry out a gear shift in a transmission (6) provided with a dual-clutch gearbox (7) and in a road vehicle (1) comprising an internal combustion engine (4) and at least one reversible electric machine (11);

• the dual-clutch gearbox (7) has two primary shafts (12), at least one secondary shaft (14) connected to drive wheels (3), and two clutches (13), each of which is interposed between a drive shaft (5) of the engine (4) and a corresponding primary shaft (12);
• the control method comprises the steps of:
• receiving a gear-shift command from a current gear (A) to a following gear (B);
• opening a first clutch (13A) associated with the current gear (A) and simultaneously closing a second clutch (13B) associated with the following gear (B);
• controlling, only and exclusively during the gear shift, the electric machine (11) to generate an additional torque profile (Tadd) which is impulsive and comprises a start segment (W) having a first sign and an end segment (X), which immediately follows the start segment (W) and has a second sign, which is contrary to the first sign;
• wherein if the gear shift is up the start segment (W) entails for an always positive torque and the final segment (X) entails an always negative torque, and if the gear shift is down the start segment (W) entails an always negative torque and the end segment (X) entails an always positive torque.