Torque distribution control system for four-wheel drive vehicle

A torque distribution control system for a four-wheel drive vehicle comprising

• an engine output control means which controls the output of the engine of the vehicle,
• a braking control means which separately controls the braking forces applied to the left wheels and the right wheels and/or the braking forces applied to the front wheels and the rear wheels,
• an acceleration detecting means which detects the longitudinal acceleration of the vehicle,
• a cornering detecting means which detects that the vehicle is making a cornering, and
• a torque distribution changing means which determines the torque distribution to the wheels on the basis of signals from the acceleration detecting means and the cornering detecting means so that the torque distribution to the rear wheels is increased with increase in the longitudinal acceleration, and the torque distribution to the rear wheels is increased when the vehicle is entering a corner and the torque distribution to the front wheels is increased when the vehicle is going out of the corner, and controls the braking control means and the engine output control means to apply a braking force to one of the front wheels and the rear wheels or one of the left wheels and the right wheels and to increase the output of the engine by an amount substantially corresponding to the braking force applied to said one of the front wheels and the rear wheels or said one of the left wheels and the right wheels so that said torque distribution determined according to the running condition of the vehicle can be obtained.