Abstract: An electric brake booster for an autonomous vehicle is provided. The electric brake booster includes a body part that receives a power cylinder generating braking pressure in an autonomous driving/braking mode and a master cylinder generating braking pressure in a manual driver braking mode. A driving shaft is movable in an axial direction in the power cylinder and coupled to a piston. A first motor is connected to a first side of the driving shaft and provides driving power thereto. A second motor is connected to a second side of the driving shaft and provides driving power thereto in a direction equal to that of the driving power provided from the first motor. A controller determines whether the first or second motor normally operates and simultaneously or separately operates the first and second motors based on a magnitude of the pressure in the power cylinder or whether emergency braking occurs.

Abstract: A method of controlling an electric booster including a reaction disk, a boosting body and a pedal push rod connected to a pedal and configured to come into contact with the reaction disk, the electric booster being subjected to braking control according to a braking map, includes: a first braking control step of controlling and generating a reaction force at normal times in accordance with a pedal effort by compressing and expanding a fluid while moving the pedal push rod; and a second braking control step of controlling and generating the reaction force in accordance with the pedal effort only in a condition in which the reaction disk and the pedal push rod are in contact with each other by detecting a size of an air gap between the reaction disk and the pedal push rod.

Abstract: A method of cooperatively controlling regenerative braking step by step for a vehicle, such as a rear-wheel-drive environmentally-friendly vehicle, performs a braking mode in accordance with a traveling risk degree determined in advance before initiating braking and changes the selectively performed braking mode by re-determining the traveling risk degree during a braking operation. The method includes: a first step of determining in advance the traveling risk degree before initiating braking; a second step of selectively performing any one of braking modes defined based on the traveling risk degree during braking; a third step of re-determining the traveling risk degree after the second step; and a fourth step of changing the selectively performed braking mode based on the traveling risk degree determined in the third step.

Abstract: 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.

Abstract: An electric brake booster is equipped with a pressure balance detecting device, which generates braking force. The electric brake booster includes: a first pressure device, which generates pressure as the driver manipulates the brake pedal; a second pressure device, which generates the same pressure as the first pressure device and generates driving power; a master chamber, which receives resultant force of brake pedal effort and driving power of a motor from a master piston that moves in the second pressure device; and a pressure balance detecting device, which detects whether a predetermined ratio is maintained between the pressure of the first pressure device applied to one side of the pressure balance detecting device and the pressure of the master chamber applied to the other side of the pressure balance detecting device.

Abstract: A system and method for preventing instability of a vehicle due to regenerative braking of a rear wheel are provided, which previously reduce a regenerative braking amount, thus securing vehicle stability and updating a regenerative brake map according to a braking situation, 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 dr

Abstract: An electric brake booster for an autonomous vehicle is provided. The electric brake booster includes a body part that receives a power cylinder generating braking pressure in an autonomous driving/braking mode and a master cylinder generating braking pressure in a manual driver braking mode. A driving shaft is movable in an axial direction in the power cylinder and coupled to a piston. A first motor is connected to a first side of the driving shaft and provides driving power thereto. A second motor is connected to a second side of the driving shaft and provides driving power thereto in a direction equal to that of the driving power provided from the first motor. A controller determines whether the first or second motor normally operates and simultaneously or separately operates the first and second motors based on a magnitude of the pressure in the power cylinder or whether emergency braking occurs.

Abstract: An apparatus for improving ride comfort of a vehicle includes: a sensing unit to sense whether an obstacle is present in a traveling direction of the vehicle and a quantity of behavior of the vehicle; a control value calculation unit to calculate control values for controlling the vehicle in a vertical direction and a pitch direction based on information sensed by the sensing unit; and a driving controller to control at least one of front wheels or rear wheels of the vehicle based on the calculated vertical-direction control values and pitch-direction control values. In particular, each of the vertical-direction control value and the pitch-direction control value includes a control value related to driving and braking the vehicle.

Abstract: A brake system for a vehicle is provided to independently adjust a braking pressure of each wheel. The system includes a hydraulic pressure brake driven by two actuators and a sub-cylinder and valve configurations that are disposed in the peripheral flow path thereof to eliminate the pressure unbalance generated in the hydraulic pressure brake.

Abstract: A method of determining a risk situation of a collision of an autonomous vehicle is provided. The method includes recognizing a preceding vehicle and measuring a variable factor including a distance or a relative speed between a traveling vehicle and the preceding vehicle. Whether a collision is capable of being avoided by turning or braking is determined based on the variable factor.

Abstract: An electric booster is provided having a force-feedback-control structure. The electric booster includes a master piston having a nut unit rectilinearly moved in a booting cylinder space by receiving driving power generated by a motor and a hydraulic pressure generated by a pedal effort. A first screw has a first end connected to the motor and a second end extending into the boosting cylinder, and is rotated by the motor operating with the brake pedal. A second screw is disposed to face the first screw to have a separation space . A connecting member connects the first screw and the second screw. A pressure balancing member has contact surfaces in contact with the second end of the first screw and the connecting member, respectively, and is deformed by a difference between two pressures when applied to the contact surfaces in a longitudinal direction of the first screw, respectively.

Abstract: A method of coast regenerative brake cooperation control for rear wheels of an environment-friendly vehicle is provided. The method actively adjusts the generation amount of a braking force when distributing the braking force to front and rear wheels in response to reception of coast regeneration generation amount information that changes in real time.

Abstract: An electric booster is provided having a force-feedback-control structure. The electric booster includes a master piston having a nut unit rectilinearly moved in a booting cylinder space by receiving driving power generated by a motor and a hydraulic pressure generated by a pedal effort. A first screw has a first end connected to the motor and a second end extending into the boosting cylinder, and is rotated by the motor operating with the brake pedal. A second screw is disposed to face the first screw to have a separation space. A connecting member connects the first screw and the second screw. A pressure balancing member has contact surfaces in contact with the second end of the first screw and the connecting member, respectively, and is deformed by a difference between two pressures when applied to the contact surfaces in a longitudinal direction of the first screw, respectively.

Abstract: A method of cooperatively controlling regenerative braking step by step for a vehicle, such as a rear-wheel-drive environmentally-friendly vehicle, performs a braking mode in accordance with a traveling risk degree determined in advance before initiating braking and changes the selectively performed braking mode by re-determining the traveling risk degree during a braking operation. The method includes: a first step of determining in advance the traveling risk degree before initiating braking; a second step of selectively performing any one of braking modes defined based on the traveling risk degree during braking; a third step of re-determining the traveling risk degree after the second step; and a fourth step of changing the selectively performed braking mode based on the traveling risk degree determined in the third step.

Abstract: A passenger occupancy detection system is provided that implements a sensor-connected passenger detection method. The system includes that a sensor controller that reads a sensor value using an ESC as an acceleration sensor when a vehicle is stopped and distinguishes an in-vehicle passenger with a vehicle acceleration change by the sensor value. The operations of a rear-seat passenger notification system 200 and a passenger-seat occupant classification advanced airbag system 300 are connected by the distinguishing the in-vehicle passenger, enhancing the sensor reliability by providing Fail-Safe together with increasing the accuracy of the passenger detection utilizing longitudinal/lateral accelerations/yaw rate information.

Abstract: An electric brake booster is equipped with a pressure balance detecting device, which generates braking force. The electric brake booster includes: a first pressure device, which generates pressure as the driver manipulates the brake pedal; a second pressure device, which generates the same pressure as the first pressure device and generates driving power; a master chamber, which receives resultant force of brake pedal effort and driving power of a motor from a master piston that moves in the second pressure device; and a pressure balance detecting device, which detects whether a predetermined ratio is maintained between the pressure of the first pressure device applied to one side of the pressure balance detecting device and the pressure of the master chamber applied to the other side of the pressure balance detecting device.

Abstract: An electric brake booster includes: a first pressure device, which generates brake fluid pressure via manipulation of a brake pedal; a second pressure device, which is connected to the first pressure device through a flow path at one side of the second pressure device, receives brake fluid pressure from the first pressure device, and receives driving power of a motor connected to another side of the second pressure device; a sensing unit mounted in the motor and measuring a displacement of the brake pedal and a rotation angle of the motor; and a buffer device connected to the second pressure device and preventing an increase in pressure of the brake pedal when the motor does not operate, in which motor rotation is controlled with a displacement of the brake pedal.

Abstract: A brake disk of a composite material includes a load part and friction parts coupled to opposing sides of the load part, wherein the load part includes a reinforcing part formed of a carbon-carbon fiber (C-CF) material and a matrix part formed of a material including silicon carbide (SiC) and covering the reinforcing part, and a weight ratio of the reinforcing part is equal to or lower than a weight ratio of the matrix part in the load part.

Abstract: A method of determining a risk situation of a collision of an autonomous vehicle is provided. The method includes recognizing a preceding vehicle and measuring a variable factor including a distance or a relative speed between a traveling vehicle and the preceding vehicle. Whether a collision is capable of being avoided by turning or braking is determined based on the variable factor.

Abstract: A passenger occupancy detection system is provided that implements a sensor-connected passenger detection method. The system includes that a sensor controller that reads a sensor value using an ESC as an acceleration sensor when a vehicle is stopped and distinguishes an in-vehicle passenger with a vehicle acceleration change by the sensor value. The operations of a rear-seat passenger notification system 200 and a passenger-seat occupant classification advanced airbag system 300 are connected by the distinguishing the in-vehicle passenger, enhancing the sensor reliability by providing Fail-Safe together with increasing the accuracy of the passenger detection utilizing longitudinal/lateral accelerations/yaw rate information.