Vehicle with electric drive and method for controlling such a vehicle

An electrically-driven vehicle, comprising:

• drive wheels;
• a powertrain including at least one electric power motor and a power transmission mechanism between said power motor and the drive wheels, the power transmission mechanism comprising a main reducer interposed between the power motor and the drive wheels, said main reducer having an epicyclic train architecture with at least one stage, where each stage comprises:
• a planet carrier;
• a central sun shaft centered about a reduction rotation axis;
• a peripheral sun shaft externally surrounding the central sun shaft, and being coaxial with the central sun shaft about the reduction rotation axis;
• at least one planetary gear, disposed between the central sun shaft and the peripheral sun shaft, meshing with the central sun shaft and the peripheral sun shaft, and being configured to rotate about the reduction rotation axis;
• an accelerator pedal;
• a regulating mechanism distinct from the powertrain, the regulating mechanism comprising:
• an electric regulating motor;
• an irreversible reduction mechanism interposed between the regulating motor and the power transmission mechanism, and acting on the power transmission mechanism in a manner making it possible to adjust, as a function of the rotational speed of the regulating motor, the reduction rate of the main reducer, to modulate a rotational speed of the power motor in order to adjust the value of the mechanical torque transmitted by the power transmission mechanism to the drive wheels, the irreversible reduction mechanism preventing a transmission of mechanical forces from the regulating motor to the drive wheels and prohibiting a transmission of mechanical forces from the power transmission mechanism to the regulating motor, said irreversible reduction mechanism being a worm and wheel system whose worm is coupled in rotation with an output shaft of the regulating motor and whose wheel is coupled in rotation with the planet carrier of one stage of said at least one stage of the main reducer, a rotation of the wheel rotating said planet carrier in a direction making it possible to increase the overall reduction rate of the power transmission mechanism;
• an electronic control unit ensuring piloting of the power motor and of the regulating motor as a function of control laws recorded in a memory of the electronic control unit, said control laws being at least dependent on an action on the accelerator pedal of the electrically-driven vehicle.