METHOD TO CONTROL A HYBRID VEHICLE SO AS TO PREVENT THE HYBRID VEHICLE FROM MOVING BACKWARD OR FORWARD WHEN IT STOPS ON A SLOPING ROAD SURFACE

A method to control a hybrid vehicle provided with an internal combustion engine (2), a servo-assisted transmission (1) and a reversible electrical machine (14) suited to generate a torque (C) to be transmitted to the drive wheels; the method comprises recognizing the occurrence of the condition in which the hybrid vehicle stands still on a sloping road surface; calculating an objective drive torque (C obj ) to be delivered to the drive wheels so as to keep the hybrid vehicle still on the sloping road surface; and controlling the reversible electrical machine (14) so as to deliver to the drive wheels the objective drive torque (C obj ) needed to keep the hybrid vehicle still on the sloping road surface.