Torque distribution method for four-wheel drive of electric vehicle, and system and vehicle

A torque distribution method for four-wheel drive of an electric vehicle, comprising:

• acquiring a total vehicle demand torque of a whole vehicle;
• determining a demand state of the whole vehicle according to traveling parameter information, and outputting a front and rear axle torque distribution coefficient corresponding to the demand state of the whole vehicle;
• wherein, the demand state comprises the highest driving efficiency, and outputting the front and rear axle torque distribution coefficient corresponding to the demand state of the whole vehicle comprises;
• obtaining a first front and rear axle torque distribution coefficient according to a mathematical model of front and rear axle driving force when front and rear wheels slip simultaneously, and according to the total demanded torque of the whole vehicle;
• obtaining the front and rear axle torque distribution coefficient according to the first front and rear axle torque distribution coefficient;
• obtaining target torque of front and rear driving system according to the front and rear axle torque distribution coefficient and the total demanded torque of the whole vehicle.