A brake system includes: a friction brake mechanism; a regenerative brake mechanism; and an electronic control unit. The electronic control unit is configured to obtain a target regenerative braking force. The electronic control unit is configured to perform replacement control between the friction brake mechanism and the regenerative brake mechanism when a predetermined replacement condition is satisfied. The replacement control is control in which a shortfall of the required total braking force, which is caused by a decrease in the regenerative braking force, is covered by increasing the front wheel friction braking force and the rear wheel friction braking force while satisfying a set relationship between the front wheel friction braking force and the rear wheel friction braking force or between an increase gradient of the front wheel friction braking force and an increase gradient of the rear wheel friction braking force.

Methods and system are provided for generating regenerative braking torque at a front axle and a rear axle of a vehicle. In one example, the regenerative braking torque may be a function of a normal load applied to the front axle and a normal load applied to the rear axle.

A vehicle drive device and a control method therefor are provided. The vehicle drive device includes: a power source including a first rotating electrical machine; a second rotating electrical machine; a differential unit including three rotating elements to which a first output shaft, a second output shaft, and the second rotating electrical machine are connected; and an electronic control device. The electronic control device regeneratively controls the first rotating electrical machine and the second rotating electrical machine in such a manner that negative torque is applied to the first output shaft and the second output shaft, when performing regenerative control by the second rotating electrical machine in a drive mode in which torque from the power source is distributed to the first output shaft and the second output shaft by controlling torque of the second rotating electrical machine during deceleration of a vehicle.

A brake control device including a pressure adjusting unit including an electric pump and an electromagnetic valve, and that adjusts, using the electromagnetic valve, a brake liquid discharged by the electric pump to an adjusted liquid pressure and introduces the adjusted liquid pressure to the wheel cylinders of the rear wheels; and a master unit that includes a master cylinder and a master piston, and that includes a master chamber connected to the wheel cylinders of the front wheels and a servo chamber to which the adjusted liquid pressure is introduced and which provides, to the master piston, an advancing force that opposes a retreating force applied to the master piston by the master chamber.

A system and a method for preventing instability of a vehicle due to regenerative braking of a rear, may include a first controller configured of distributing braking torque of front and rear wheels for a deceleration level according to a basic regenerative braking distribution ratio on a regenerative brake map on the basis of a driver demand braking amount, and configured of previously reducing a rear-wheel regenerative braking torque of the rear wheel to a first reference value or less than the first reference value in an adjustment section between first and second deceleration; and a second controller connected to the first controller and configured of further reducing the rear-wheel regenerative braking torque to transmit it to the first controller, if a wheel slip value is greater than a reference slip value according to vehicle driving information during braking of the vehicle.

A brake control device applied to a vehicle including a regenerative generator connected to a front wheel has an electric pump, and first and second pressure adjustment valves. The first pressure adjustment valve is provided in a brake fluid reflux path including the electric pump, adjusts the brake fluid to a first hydraulic pressure, and adjusts a rear wheel hydraulic pressure in a rear wheel cylinder to the first hydraulic pressure. The second pressure adjustment valve is provided in the reflux path, reduces the first hydraulic pressure to a second hydraulic pressure, and adjusts front wheel hydraulic pressure in a front wheel cylinder to the second hydraulic pressure. A front wheel flow rate to increase the front wheel hydraulic pressure is calculated using a brake operation member operation amount and a regeneration amount of the regenerative generator. The first pressure adjustment valve is controlled using the front wheel flow rate.

A vehicle includes: two front wheels which are front right and left wheels and two rear wheels which are rear right and left wheels; a brake system capable of applying a braking force to only one of (a) the two front wheels and (b) two rear wheels, independently of each other utilizing a friction force; and a drive system configured to drive at least the other of (a) the two front wheels and (b) the two rear wheels by a force of electric, motors, each as a drive source, respectively corresponding to the other of (a) the two from wheels and (b) the two rear wheels, the drive system being capable of applying a braking force to at least the other of (a) the two front wheels and (b) the two rear wheels, independently of each other utilizing regeneration by the electric motors.

A method for controlling the regenerative braking torque of a vehicle having a data processing unit for detecting a first information representing a deceleration request of the vehicle, detecting a second information representing a speed of the vehicle, and a first moving member of the vehicle and a second moving member of the vehicle. The method includes determining temperatures of different braking components on different axles, as well as the state of a battery module and a traction and regenerative braking module. The method also includes determining a regenerative braking power dynamic distribution ratio between the first and second axles. A regenerative braking torque is provided to one of the modules.

A brake control device is applied to a brake device that controls a front-wheel braking force and a rear-wheel braking force. The brake control device includes a ratio calculation circuit that calculates a target front and rear braking force distribution ratio based on a target pitch angle, and a brake control circuit that performs a stability control by operating the brake device based on the target front and rear braking force distribution ratio during braking.

A brake control device adjusts a front wheel braking hydraulic pressure of front wheel cylinders provided on front wheels of a vehicle and a rear wheel braking hydraulic pressure of rear wheel cylinders provided on rear wheels of the vehicle. The brake control device includes a hydraulic pressure generating unit configured to adjust a hydraulic pressure generated by an electric motor to an adjusted hydraulic pressure and apply the adjusted hydraulic pressure as the rear wheel braking hydraulic pressure and a hydraulic pressure correcting unit configured to adjust to decrease the adjusted hydraulic pressure to be a corrected hydraulic pressure, and apply the corrected hydraulic pressure as the front wheel braking hydraulic pressure.