A method to control the execution of a downshift with a released accelerator pedal in a drivetrain provided with a dual-clutch, servo-assisted transmission, so as to shift from a current gear to a following gear, which has a shorter transmission ratio than the current gear; wherein the drivetrain belongs to a road vehicle driven by a driver and provided also with an internal combustion engine and with the accelerator pedal; the drivetrain comprises a dual-clutch, servo-assisted transmission having two primary shafts; at least one secondary shaft connected to drive wheels; and two clutches (16A, 16B), each interposed between a drive shaft of the internal combustion engine and a corresponding primary shaft; the control method comprises the steps of: opening, in a first instant (t 1), an outgoing clutch associated with the current gear; closing, in the first instant (t 1), an incoming clutch associated with the following gear; completing the opening of the outgoing clutch by means of a first linear ramp in a second instant; closing the incoming clutch by means of a second linear ramp starting from a third instant (t 2), which is prior to or coincides with the second instant; synchronizing, between the second instant and a fourth instant (t 4), a rotation speed (ω E) of the internal combustion engine with a rotation speed (ω B) of the incoming clutch, namely with the rotation speed (ω B) imposed by the gear ratio of the following gear; and completing the closing of the incoming clutch in a fifth instant (t 3), which coincides with or is subsequent to the second instant; the control method is characterized in that it comprises the further step of activating the internal combustion engine so as to generate a torque (T E) between the third instant (t 2) and the fourth instant (t 4) in order to increase the rotation speed (ω E) of the internal combustion engine. the drivetrain comprises a dual-clutch, servo-assisted transmission having two primary shafts; at least one secondary shaft connected to drive wheels; and two clutches (16A, 16B), each interposed between a drive shaft of the internal combustion engine and a corresponding primary shaft; the control method comprises the steps of: opening, in a first instant (t 1), an outgoing clutch associated with the current gear; closing, in the first instant (t 1), an incoming clutch associated with the following gear; completing the opening of the outgoing clutch by means of a first linear ramp in a second instant; closing the incoming clutch by means of a second linear ramp starting from a third instant (t 2), which is prior to or coincides with the second instant; synchronizing, between the second instant and a fourth instant (t 4), a rotation speed (ω E) of the internal combustion engine with a rotation speed (ω B) of the incoming clutch, namely with the rotation speed (ω B) imposed by the gear ratio of the following gear; and completing the closing of the incoming clutch in a fifth instant (t 3), which coincides with or is subsequent to the second instant; the control method is characterized in that it comprises the further step of activating the internal combustion engine so as to generate a torque (T E) between the third instant (t 2) and the fourth instant (t 4) in order to increase the rotation speed (ω E) of the internal combustion engine. opening, in a first instant (t 1), an outgoing clutch associated with the current gear; closing, in the first instant (t 1), an incoming clutch associated with the following gear; completing the opening of the outgoing clutch by means of a first linear ramp in a second instant; closing the incoming clutch by means of a second linear ramp starting from a third instant (t 2), which is prior to or coincides with the second instant; synchronizing, between the second instant and a fourth instant (t 4), a rotation speed (ω E) of the internal combustion engine with a rotation speed (ω B) of the incoming clutch, namely with the rotation speed (ω B) imposed by the gear ratio of the following gear; and completing the closing of the incoming clutch in a fifth instant (t 3), which coincides with or is subsequent to the second instant; the control method is characterized in that it comprises the further step of activating the internal combustion engine so as to generate a torque (T E) between the third instant (t 2) and the fourth instant (t 4) in order to increase the rotation speed (ω E) of the internal combustion engine.