Braking force control system of vehicle

A braking force control system of a vehicle, capable of independently controlling at least braking forces of front wheel brakes, a braking force of a left rear wheel brake and a braking force of a right rear wheel brake, comprising:

• brake operation quantity detecting means for detecting a quantity of operation of a brake operating member;
• deceleration detecting means for detecting a deceleration of the vehicle;
• target deceleration determining means for determining a target deceleration of the vehicle on the basis of a detected value detected by said brake operation quantity detecting means;
• steering quantity detecting means for detecting a vehicle speed;
• turning level detecting means for detecting a turning level of the vehicle;
• target turning level determining means for determining a target turning level of the vehicle on the basis of detection values detected by said steering quantity detecting means and said vehicle speed detecting means;
• a front wheel-side control means for controlling the braking forces of the front wheel brakes together on the basis of outputs from said target deceleration determining means and said deceleration detecting means, so that the deceleration of the vehicle becomes equal to said target deceleration;
• and
• a rear wheel-side control means for controlling at least one of the braking forces of the left rear wheel brake and the right rear wheel brake independently from each other on the basis of outputs from said target turning level determining means and said turning level detecting means to provide a difference between the brake forces of the rear wheel brakes, so that the turning level of the vehicle becomes equal to said target turning level.

A braking force control system of a vehicle capable of independently controlling at least braking forces of front wheel brakes together, a braking force of a left rear wheel brake and a braking force of a right rear wheel brake, comprising:

• brake operation quantity detecting means for detecting a quantity of operation of a brake operating member;
• total braking force determining for determining a total braking force which is a sum of the braking forces of the front and rear wheel brakes on the basis of a detection value detected by said brake operation quantity detecting means;
• reference braking force determining means for determining reference braking forces for the brakes by distributing the total braking force in accordance with a shared load ratio defined for every brake;
• deceleration detecting means for detecting a deceleration of the vehicle;
• target deceleration determining means for determining a target deceleration of the vehicle on the basis of the detection value detected by said brake operation quantity detection means;
• front wheel-side correcting means for correcting the reference braking force for the front wheel brakes together on the basis of a deviation between said target deceleration and the detected deceleration;
• steering quantity detecting means for detecting a steering quantity;
• vehicle speed detecting means for detecting a vehicle speed;
• turning level detecting means for detecting a turning level of the vehicle;
• target turning level detecting means for detecting a target turning level of the vehicle on the basis of detecting values detected by said steering quantity detecting means and said vehicle speed detecting means;
• rear wheel-side correcting means for correcting the reference braking force for each rear wheel on the basis of a deviation between said target turning level and the detected turning level;
• and
• driving means for driving each wheel brake on the basis of the corrected reference braking force.