An electronic parking brake system including: an electronic parking brake provided to generate a clamping force on a wheel of a vehicle; and a controller configured to estimate a weight of the vehicle based on a wheel pressure and a longitudinal acceleration of the vehicle at a time of service braking during driving, determine a clamping force required for parking based on the estimated weight of the vehicle during a parking operation, and operate the electronic parking brake to generate the determined clamping force.

Disclosed herein an electric parking brake (EPB) system includes a first EPB provided on a left wheel of a vehicle; a second EPB provided on a right wheel of the vehicle; and a controller configured to determine an EPB that is to be operated alone from among the first and second EPBs in response to a gear being shifted to a P-stage, and operate the determined EPB alone.

The present disclosure relates to an actuator for a brake device. The actuator includes a housing having a motor accommodating part and a gear accommodating part, a motor accommodated in the motor accommodating part, and a reduction device accommodated in the gear accommodating part, wherein the reduction device includes, a crossed helical gear reduction unit including a driving crossed helical gear coupled to a shaft of the motor, and a ring wheel provided with a driven crossed helical gear engaged with the driving crossed helical gear on an outer circumference thereof, and a planetary gear reduction unit including a sun gear rotating together with the ring wheel, a ring gear provided as an internal gear, a plurality of planetary gears engaged with the sun gear and the ring gear, and a carrier on which the plurality of planetary gears is rotatably supported and having an output shaft.

A brake system for actuating a pair of front wheel brakes and a pair of rear wheel brakes is selectively operable during a manual push-through mode. A primary power transmission unit actuates at least one of wheel brakes in a normal braking mode. A secondary power transmission unit actuates the front wheel brakes in a backup braking mode. A primary electronic control unit controls at least one of the primary power transmission unit and a pair of rear brake motors. A secondary electronic control unit controls at least one of the secondary power transmission unit and the rear brake motors. An ABS modulator arrangement is hydraulically interposed between at least one of first and second three-way valves and at least a selected wheel brake. A multiplex control valve arrangement is hydraulically interposed between the secondary power transmission unit and the front wheel brakes.

A brake system includes a reservoir and a master cylinder operable to provide a brake signal responsive to actuation of a brake pedal connected thereto. The master cylinder is selectively operable to generate brake actuating pressure at an output for hydraulically actuating a pair of hydraulically actuated wheel brakes in a manual push-through operation. A power transmission unit is configured to selectively generate pressurized hydraulic fluid for actuating the pair of hydraulically actuated wheel brakes. First and second two-position three-way valves are hydraulically connected to respective ones of the pair of hydraulically operated brakes and to both the master cylinder and the power transmission unit. The first and second three-way valves each are configured to selectively switch the respective hydraulically operated brake to receive fluid from a selected one of the master cylinder, in a backup braking mode, and the power transmission unit, in a normal non-failure braking mode.

An electro-mechanical brake and a vehicle including the same are provided. As an electro-mechanical brake according to one embodiment of the present invention, an electro-mechanical brake including a drum, a first brake shoe, and a second brake shoe, may include a motor that provides a rotational driving force; a rotating member that rotates about a second rotating shaft perpendicular to a first rotating shaft of the motor; a power transmission member that transmits the rotational driving force of the motor to the rotating member; and a rotating screw that is coupled to the rotating member so that the first brake shoe is able to move forward and backward toward one inner peripheral surface of the drum.

An electrically controlled differential gear is disposed between a right front wheel and a left front wheel of a vehicle. The electrically controlled differential gear includes a clutch mechanism that limits a differential operation of the electrically controlled differential gear. A second ECU (control portion) obtains information as to failure associated with actuation of a right front electric brake mechanism. The second ECU obtains a physical amount relating to a required braking force which is applied to the left front wheel and the right front wheel. The second ECU outputs a differential limiting control command for limiting the differential operation of the electrically controlled differential gear to the clutch mechanism (or more specifically, a differential ECU that controls the clutch mechanism) based on the information as to the failure and the physical amount relating to the required braking force.

A disk brake includes a brake mechanism configured to apply a braking force by advancing a piston in a cylinder portion based on driving of an electric motor to thus press inner and outer brake pads against a disk rotor, and an elastic member configured to bias the inner and outer brake pads in an axial direction of the disk rotor and in a direction away from the disk rotor. A biasing force of the elastic member is greater than sliding resistance of the piston on the cylinder portion. Due to this configuration, the disk brake can effectively prevent or reduce the drags of the inner and outer brake pads.

Provided fire an electric parking brake device and an electric parking brake control method that can apply an appropriate clamping force by accelerating data measurement and by suppressing influence of load fluctuation during idle rum For this end, the electric parking brake device of the present invention includes: a disc rotor; brake pads that are pressed to the disc rotor; an electric motor that imparts a thrust to the brake pads; a current detection unit that detects a motor current of the electric motor; and a brake control device that controls the electric motor 8 based on the motor current. The brake control device controls the electric motor 8 based on a current change amount of an electric current during a period from a point of time that the motor current becomes a peak current to a predetermined point of time.

An electric disc brake system for a trailer. The brake system employs a caliper assembly that is attached to the trailer with floating fasteners, wherein the caliper assembly straddles an axle mounted rotor positioning an inner and outer brake pad adjacent to the rotor. A screw drive assembly is attached to the caliper. The assembly includes an electric motor coupled to a piston by a threaded shaft. The screw drive assembly converts rotation of the electric motor into linear motion to movement of the piston, wherein the inner and outer brake pads engage the rotor based upon the amount of pressure applied by the piston. A controller reacts to the pressure applied to a brake pedal to cause the electric motor to rotate in a clockwise or counter-clockwise direction.