A control method for an electro-mechanical brake including a piston configured to push a brake pad toward a wheel disk through driving of a motor, the control method for an electro-mechanical brake including: detecting positions of the piston and current values of the motor while braking is performed; detecting piston position-based estimated braking force values based on the detected positions of the piston; detecting current-based estimated braking force values based on the detected current values of the motor; determining that a state of the brake pad has changed from an initial state to another state when the piston position-based estimated braking force values and the current-based estimated braking force values are different from each other; determining whether a thickness or physical property of the brake pad has changed when determining that the state of the brake pad has changed from the initial state to the other state; setting a new home position by compensating for a preset home position when determining that the thickness of the brake pad has changed; and detecting an actual braking force value based on a movement distance of the piston from the new home position, wherein the home position refers to a position set so that the piston is disposed at the position at the time of non-braking.

An electromechanical brake device has a rotation-translation converter of short construction for moving a brake piston in an electromechanically operable wheel brake of a motor vehicle, and to a motor vehicle having an electromechanical brake device of this type. The electromechanical brake device comprises a caliper housing defining an actuator receptacle, an actuator unit having a piston movable in a linear manner relative to the caliper housing, wherein at least a portion of the actuator unit is arranged within the actuator receptacle, a drive unit to generate a drive torque which can be transmitted to the actuator unit, a rotation-translation converter of the actuator to axially shift the piston based on the drive torque; and at least one first rotation prevention device for securing against relative rotation between the piston and the actuator receptacle.

A vehicle braking apparatus includes a cylinder, a piston, an adjuster, and an engagement mechanism. A brake fluid is to be supplied to the cylinder. The piston is configured to slide by a fluid pressure of the brake fluid inside the cylinder. The adjuster is configured to move inside the piston in a sliding direction of the piston, and press the piston by a forward rotation of an electric motor of an electric parking brake. The engagement mechanism is configured to, upon a movement of the adjuster by a reverse rotation of the electric motor, cause the adjuster and the piston to be in engagement with each other, and release the engagement of the adjuster and the piston by an increase in the fluid pressure of the brake fluid inside the cylinder.

A method of controlling an electro-mechanical brake device, includes: switching a central electronic control unit (ECU) to an awake mode based on a wake-up signal; transmitting a signal such that a wheel ECU is switched from a sleep mode to the awake mode; when a braking input is detected, supplying a current to a motor mounted on an electro-mechanical brake (EMB) using current control to generate a braking force; when a parking braking force is less than a required braking force, controlling the wheel ECU to release the parking braking force and generate the required braking force, and when the parking braking force is greater than or equal to the required braking force, releasing the parking braking force and maintaining the braking force generated in a wheel; when the braking force reaches the required braking force or the braking force is maintained, switching the current control to position control.

Disclosed are electro-mechanical brake and control method thereof.

According to an embodiment of the present disclosure, there is provided a control method of electro-mechanical brake in which a piston is moved by driving a motor to bring a brake pad into close contact with a wheel disk, the method includes determining whether the vehicle is in a stopped state while traveling by using a wheel speed sensor; in response to a determination that the vehicle is stopped while traveling, determining whether a set brake force command value is included in a preset brake force command interval according to a degree of stroke of a brake pedal; in response to a determination that the brake force command value is included in the preset brake force command interval, determining whether the positions of the piston, the brake pad, and the wheel disk are readjusted; in response to a determination that the positions of the piston, the brake pad, and the wheel disk are not readjusted, determining whether the brake force command value changes within a preset change rate for a preset time; detecting a piston position-based estimated brake force value based on a position detector that detects the position of the piston; in response to a determination that the brake force command value is changed within the preset change rate, determining whether a difference between the brake force command value and the piston position-based estimated brake force value is within a preset value; and in response to a determination that the difference is within the preset value, controlling positions of the piston, the brake pad, and the wheel disk by providing a readjustment command for readjustment of the positions.

An electromechanical brake and an operating method thereof are disclosed. According to an aspect of the present disclosure, there may be provided an electromechanical brake including: a piston which is provided to be capable of advancing and retreating to press a pad plate; a power conversion unit including a spindle which rotates by receiving a driving force from an actuator, and a nut which is connected to the spindle and advances or retreats by rotation of the spindle in a first direction or a second direction; and a positioning portion which is screwed with a thread formed inside the piston, receives a rotational force from a drive motor, linearly moves according to rotational movement, and adjusts a relative position of the piston with respect to the power conversion unit, wherein the positioning portion includes a first screw provided on an outer surface of one side of the nut and having, on an outer peripheral surface, a first thread that meshes with the thread, a second screw provided on an outer side surface of the other side of the nut and having, on an outer peripheral surface, a second thread that meshes with the thread, a first gear provided to rotate together with the second screw by receiving the rotational force from the drive motor, and an interlocking member provided between the first screw and the second screws to interlock and linearly move the first and second screws by the rotation of either the first screw or the second screw and adjust a relative position with the piston.

An electromechanical brake (EMB) system is provided. The EMB system may include: a brake rotor configured to be rotatable with a wheel of a vehicle; a brake pad assembly configured to be engageable with the brake rotor; an actuator assembly comprising an electric motor configured to mechanically move the brake pad assembly toward or away from the brake rotor via driving of a driven pulley; and an electronic control unit (ECU) coupled the actuator assembly, the ECU having a processor coupled to a memory that stores instructions that when executed by the processor causes the ECU to perform operations. The operations may include: using only a motor position of the electric motor and a clamp force exhibited when the brake pad assembly engages with the brake rotor to prevent occurrence of drag in the EMB assembly.

A brake apparatus may include a rotary member, a friction member configured to apply a frictional force to the rotary member, an electric actuator configured to move the friction member, a clamping force detection member configured to detect a clamping force in accordance with contact between the rotary member and the friction member, and a controller configured to control an operation of the electric actuator, in which the controller determines a reference position on the basis of a position of the friction member at a time point at which the rotary member and the friction member are separated, determines a clearance between the rotary member and the friction member on the basis of the detected clamping force on the basis of the reference position, and control the movement of the friction member on the basis of the clearance.

A brake system of a vehicle, with electromechanical service brakes on at least one axle designed without force sensors, having a control unit designed to control a braking operation for meeting a braking demand by activating the electromechanical service brakes of all the axles. An acquisition element on each of the electromechanical service brakes acquires a parameter from which a current brake touch point of the electromechanical service brake in question can be determined. For operating the brake system, the brakes on one of the axles of the vehicle are actuated during a braking operation. A current value of a brake touch point of the electromechanical service brakes on another axle that is currently not being used to provide the brake force of the ongoing braking operation is determined. An air gap of those electromechanical service brakes is set according to the current value of the brake touch point.

A brake device and a machine including the brake device. The brake device includes an actuator, a transmission, an expander device, a brake lining and a frictional surface. The actuator moves in a limited actuator actuation region, and in at least part of the actuator actuation region, the actuator turns the expander device about at least one fulcrum via the transmission. In at least part of the actuator actuation region, for the purpose of braking, the actuator presses the brake lining, via the expander device, in the direction of and onto the frictional surface to generate a pressing force and a braking torque resulting therefrom. The transmission has a non-linear transmission ratio that is not constant over at least part of the actuator actuation region. The transmission turns the expander device in accordance with the non-linearity.