The present disclosure relates to a system and method for operating a main brake in case of a failure of an autonomous driving function of an autonomous vehicle. the system for operating the main brake in case of a failure of the autonomous driving function of the autonomous vehicle includes an autonomous driving control unit configured to perform control such that the autonomous vehicle travels in the autonomous driving mode, a main brake control unit configured to perform first communication with the autonomous driving control unit and to output a first control signal so that a frictional braking force is generated to a main brake by hydraulic pressure, and a regenerative braking control unit configured to perform second communication with the main brake control unit and to output a second control signal so that a regenerative braking force is generated to a motor.

A vehicle braking control method includes activating an electronic parking brake system on a vehicle to perform a braking operation; checking whether a rear wheel unlock braking activation condition is met during the braking operation, and if it is met, acquiring a current vehicle stability characteristic. The method further includes determining whether the acquired vehicle stability characteristic is within a preset range; if it is, using motive power supplied by an electric machine on the vehicle together with a rear wheel unlock braking system to execute the braking operation, otherwise executing the braking operation with the rear wheel unlock braking system.

A technique provides power-limiting regenerative braking to a utility vehicle. The technique involves detecting that the utility vehicle is moving in a forward direction at a first speed. The technique further involves applying a first regenerative braking power level to the utility vehicle in response to detecting that the utility vehicle is moving in the forward direction at the first speed. The technique further involves detecting that the utility vehicle is moving in the forward direction at a second speed which is less than the first speed. The technique further involves applying a second regenerative braking power level to the utility vehicle in response to detecting that the utility vehicle is moving in the forward direction at the second speed. The second regenerative braking power level is lower than the first regenerative braking power level.

In a vehicle, application of hydraulic pressure in a hydraulic braking device is started, when an accelerator is turned on, and the accelerator is predicted to be turned off, and engine braking feeling is predicted to become insufficient, the engine braking feeling being deceleration feeling given to a driver when the accelerator is turned off and an engine brake is operated, and a predetermined condition that prediction time until the accelerator is turned off is shorter than dead time of a hydraulic pressure response of the hydraulic braking device is established. The hydraulic braking device generates a negative jerk in the vehicle when the accelerator is turned off upon lapse of dead time after application of the hydraulic pressure in the hydraulic braking device is started.

The control device includes a vehicle required braking force acquisition unit that acquires a vehicle required braking force that is a required value of the braking force applied to the vehicle, and a roll control unit that controls the rolling motion of the vehicle by adjusting a distribution ratio of the braking force with respect to a target wheel including at least one of a rear wheel on an inside during turning and a front wheel on an outside during turning of the vehicle when the braking force is applied to the vehicle according to the vehicle required braking force under a situation where the vehicle is turning.

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 system for an electrically driven vehicle includes at least one motor controller configured to control at least one electric motor, with which at least one drive wheel of the vehicle can be driven. The system further includes at least one brake controller configured to control friction brakes, with each of which one of multiple drive wheels and/or non-driven wheels can be braked. The brake controller and the electric motor controller each have a data interface that is a bus interface. The brake controller and the electric motor controller are set up to send and/or receive data with a predefined maximum data transmission rate via the first data interface. The brake controller and the electric motor each have a second data interface, each second data interface being designed to send and/or receive data with a higher data transmission rate than the maximum data transmission rate of the first data interface.

A technique controls regenerative braking to reduce skidding of a vehicle. Such a technique involves imparting rotation to an alternating current (AC) electric motor to move the vehicle to a first commanded vehicle speed; applying a regenerative braking power to the AC electric motor to bring the vehicle to a second commanded vehicle speed; while applying the regenerative braking power, adjusting the level of regenerative braking power applied to follow a predetermined speed reduction rate; while adjusting the level of regenerative braking power applied, provide a limit to the maximum level of regenerative braking power available; and while providing the limit to the maximum level of regenerative braking power available, adjusting the limit to the maximum level of regenerative braking power available based on a current speed of the vehicle.

A regenerative braking control method of a vehicle, may include a first operation of determining a driving risk of a road surface on the basis of a status of the road surface while driving; a second operation of determining whether an accelerator pedal is released while driving; a third operation of determining whether a brake pedal is operated while driving; and a fourth operation of performing no regenerative braking when the accelerator pedal is determined as being released, the driving risk of the road surface is determined as being high, and when the brake pedal is determined as not being operated.

The present disclosure provides a method of controlling braking of an electric vehicle in which friction braking force generated by a friction braking unit is applied to front wheels and regenerative braking force generated by a motor is applied to rear wheels includes: determining driver's request braking force by a controller based on a driver's braking-input value; detecting driving information and state information of the vehicle by a detection unit; and determining a braking mode of the vehicle that satisfies the driver's request braking force by the controller based on the detected information and information of running state of the vehicle obtained from the detected information. In addition, the present disclosure provides a system of controlling braking of an electric vehicle.