A management method of the functioning mode of a hybrid drive assembly of a vehicle, in particular a scooter, comprising at least one internal combustion engine and an electric machine, the method comprising the phases of: a) determining a required torque and a vehicle state based on a series of received input parameters and/or commands; b) operating said internal combustion engine so that it does not supply torque and operating the electric machine so that it functions as a generator for charging an accumulator system, when said torque required is negative; c) operating said internal combustion engine and/or said electric machine so as to: - satisfy said required torque; and/or - bring said accumulator system to a pre-established charge level and/or operate said internal combustion engine under maximum efficiency regime conditions, when the torque required is positive and lower than the maximum torque which can be supplied by said internal combustion engine; d) operating said internal combustion engine and said electric machine supplying propulsive torque, in order to satisfy said torque required, when said torque required is positive and higher than the maximum torque which can be supplied by said internal combustion engine, wherein said series of input parameters and/or commands used in determining said torque required and said vehicle state is selected from the group consisting of: - the management strategy of said vehicle; - the rotation of an accelerator handle of said vehicle; - the state of at least one brake of said vehicle; - the rotation speed of a rotor of said electric machine; - the torque supplied by the internal combustion engine; - the rotation speed of the internal combustion engine; - the angular position of a butterfly valve of said internal combustion engine; - the air flow inside said internal combustion engine; - the charge state of said accumulator system and combinations thereof. a) determining a required torque and a vehicle state based on a series of received input parameters and/or commands; b) operating said internal combustion engine so that it does not supply torque and operating the electric machine so that it functions as a generator for charging an accumulator system, when said torque required is negative; c) operating said internal combustion engine and/or said electric machine so as to: - satisfy said required torque; and/or - bring said accumulator system to a pre-established charge level and/or operate said internal combustion engine under maximum efficiency regime conditions, when the torque required is positive and lower than the maximum torque which can be supplied by said internal combustion engine; - satisfy said required torque; and/or - bring said accumulator system to a pre-established charge level and/or operate said internal combustion engine under maximum efficiency regime conditions, when the torque required is positive and lower than the maximum torque which can be supplied by said internal combustion engine; d) operating said internal combustion engine and said electric machine supplying propulsive torque, in order to satisfy said torque required, when said torque required is positive and higher than the maximum torque which can be supplied by said internal combustion engine, wherein said series of input parameters and/or commands used in determining said torque required and said vehicle state is selected from the group consisting of: - the management strategy of said vehicle; - the rotation of an accelerator handle of said vehicle; - the state of at least one brake of said vehicle; - the rotation speed of a rotor of said electric machine; - the torque supplied by the internal combustion engine; - the rotation speed of the internal combustion engine; - the angular position of a butterfly valve of said internal combustion engine; - the air flow inside said internal combustion engine; - the charge state of said accumulator system and combinations thereof. - the management strategy of said vehicle; - the rotation of an accelerator handle of said vehicle; - the state of at least one brake of said vehicle; - the rotation speed of a rotor of said electric machine; - the torque supplied by the internal combustion engine; - the rotation speed of the internal combustion engine; - the angular position of a butterfly valve of said internal combustion engine; - the air flow inside said internal combustion engine; - the charge state of said accumulator system and combinations thereof.