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: Provided is a method and system for collecting sensor data using a data channel and a control channel. The method and system construct an appropriate and efficient communication environment when there are several sensors corresponding to one gateway in order to collect measured data from the sensors, by using a separate control channel for general control communication and a data channel for data communication to transmit data after confirming whether the data channel is available through the control channel in the communication between a gateway and sensors.

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: Provided is a method and system for collecting sensor data using a data channel and a control channel. The method and system construct an appropriate and efficient communication environment when there are several sensors corresponding to one gateway in order to collect measured data from the sensors, by using a separate control channel for general control communication and a data channel for data communication to transmit data after confirming whether the data channel is available through the control channel in the communication between a gateway and sensors.

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: 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 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 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 structure of a brake-cooling duct, which is disposed at one side of an intercooler tank to cool a brake disc using air may include the brake-cooling duct has an air movement channel and a through-hole formed in a side surface thereof to expose the channel to an outside, wherein the brake-cooling duct is disposed close to one side of the intercooler tank so that an external surface of the intercooler tank is exposed to the channel via the through-hole, allowing the air introduced into the channel to be brought into contact with the external surface of the intercooler tank, and thereafter be discharged rearward thereof.

Abstract: A structure of a brake-cooling duct, which is disposed at one side of an intercooler tank to cool a brake disc using air may include the brake-cooling duct has an air movement channel and a through-hole formed in a side surface thereof to expose the channel to an outside, wherein the brake-cooling duct is disposed close to one side of the intercooler tank so that an external surface of the intercooler tank is exposed to the channel via the through-hole, allowing the air introduced into the channel to be brought into contact with the external surface of the intercooler tank, and thereafter be discharged rearward thereof.

Abstract: A disk brake having a double self-cooling structure to suppress thermal deformation may include a brake disk having a double cooling structure, which is capable of securing cooling performance of the disk while reducing cost and weight of a vehicle compared with the prior art by configuring a self-cooling structure of the disk that can suppress thermal deformation due to excessive frictional heat during braking a vehicle.

Abstract: An electric valve may include a valve housing, a valve plate disposed in the exhaust gas passage of the valve housing by a rotation shaft, a heat shield being connected to the valve housing by a bracket and forming a penetration opening to be penetrated by an upper end portion of the rotation shaft, an actuator assembled on the heat shield to decelerate torque of a drive actuator and then to output the decelerated torque, a power delivering member transferring torque of the drive actuator, wherein damping is performed by a power delivering spring disposed between a spring seat mounted the rotation shaft and the worm wheel of the actuator, to the rotation shaft, and a rotation limiting member mounted between the penetration opening of the heat shield and the spring seat corresponding with the penetration opening to limit a rotation angle of the rotation shaft.

Abstract: A disk brake having a double self-cooling structure to suppress thermal deformation may include a brake disk having a double cooling structure, which is capable of securing cooling performance of the disk while reducing cost and weight of a vehicle compared with the prior art by configuring a self-cooling structure of the disk that can suppress thermal deformation due to excessive frictional heat during braking a vehicle.

Abstract: An electric valve may include a valve housing, a valve plate disposed in the exhaust gas passage of the valve housing by a rotation shaft, a heat shield being connected to the valve housing by a bracket and forming a penetration opening to be penetrated by an upper end portion of the rotation shaft, an actuator assembled on the heat shield to decelerate torque of a drive actuator and then to output the decelerated torque, a power delivering member transferring torque of the drive actuator, wherein damping is performed by a power delivering spring disposed between a spring seat mounted the rotation shaft and the worm wheel of the actuator, to the rotation shaft, and a rotation limiting member mounted between the penetration opening of the heat shield and the spring seat corresponding with the penetration opening to limit a rotation angle of the rotation shaft.

Abstract: A braking system having an electromechanical braking function may include a compound caliper device including a motor and configured to press a pair of brake pads against a brake disk, a hydraulic pressure producer including a master hydraulic line receiving oil from a master cylinder, a master valve configured to open and close the master hydraulic line, a caliper hydraulic line connected to the compound caliper device, and a hydraulic pump configured to increase hydraulic pressure supplied to the compound caliper device, and a brake controller to control the motor and the hydraulic pressure producer, in which the brake controller is configured to close the master valve and decrease clamping force of the brake pads applied by the motor when a conversion condition for converting a parking brake stage into a primary brake stage is satisfied.