Patent ID: 12187250

DETAILED DESCRIPTION

Like reference numerals refer to like elements throughout the specification. This specification does not describe all the elements of the embodiments, and duplicative contents between general contents or embodiments in the technical field of the present disclosure will be omitted. The terms ‘part,’ ‘module,’ ‘member,’ and ‘block’ used in this specification may be embodied as software or hardware, and it is also possible for a plurality of ‘parts,’ ‘modules,’ ‘members,’ and ‘blocks’ to be embodied as one component, or one ‘part,’ ‘module,’ ‘member,’ and ‘block’ to include a plurality of components according to embodiments.

Throughout the specification, when a part is referred to as being “connected” to another part, it includes not only a direct connection but also an indirect connection, and the indirect connection includes connecting through a wireless network.

Also, when it is described that a part “includes” an element, it means that the element may further include other elements, not excluding the other elements unless specifically stated otherwise.

Throughout the specification, when a member is described as being “on” another member, this includes not only a case in which a member is in contact with another member but also a case in which another member is present between the two members.

The terms ‘first,’ ‘second,’ etc. are used to distinguish one element from another element, and the elements are not limited by the above-mentioned terms. The singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

In each step, an identification numeral is used for convenience of explanation, the identification numeral does not describe the order of the steps, and each step may be performed differently from the order specified unless the context clearly states a particular order.

FIG.1illustrates a structure of an electronic parking brake included in an electronic parking brake system according to an embodiment.

Referring toFIG.1, an electronic parking brake100may include a carrier110on which a pair of pad plates111and112are installed to move forward or backward to press a brake disc D rotating together with a wheel of a vehicle, a caliper housing120provided with a cylinder123slidably installed on the carrier110and in which a piston121is installed to move forward or backward by a braking hydraulic pressure, a power conversion unit130to press the piston121, and an actuator140to transmit a rotational force to the power conversion unit130using a motor141.

The pair of pad plates111and112may be divided into the inner pad plate111disposed to be in contact with the piston121and the outer pad plate112disposed to be in contact with a finger part122of the caliper housing120. The pair of pad plates111and112are installed on the carrier110fixed to a vehicle body so as to move forward or backward toward both sides of the brake disk D. In addition, a brake pad113may be attached to one surface of each of the pad plates111and112facing the brake disk D.

The caliper housing120may be slidably installed on the carrier110. More specifically, the caliper housing120may include the cylinder123in which the power conversion unit130is installed at a rear portion thereof and the piston121moves forward or backward therein, and the finger part122formed in a front portion thereof to be bent in a downward direction so as to operate the outer pad plate112. The finger part122and the cylinder123may be formed integrally.

The piston121may be provided in a cylindrical shape in which the inside thereof is recessed in a cup shape to be slidably inserted into the cylinder123. The piston121may press the inner pad plate111to the brake disk D side by an axial force of the power conversion unit130receiving the rotational force of the EPB (electronic parking brake) actuator140. Accordingly, when the axial force of the power conversion unit130is applied, the piston121moves forward to the inner pad plate111side to press the inner pad plate111, and the caliper housing120operates in a direction opposite to the piston121by a reaction force so that the finger part122presses the outer pad plate112to the brake disk D side, thereby performing braking.

The power conversion unit130may perform a function of pressing the piston121toward the inner pad plate111by receiving the rotational force from the motor actuator140.

The power conversion unit130may include a nut member131installed in the piston121to be in contact with the piston121, and a spindle member135screwed to the nut member131.

The nut member131may be disposed in the piston121in a state in which a rotation thereof is restricted to be screwed to the spindle member135.

The nut member131may be formed by a head part132provided to be in contact with the piston121, and a coupling part133formed extending from the head part132and having a female thread formed on an inner circumferential surface thereof to be screwed to the spindle member135.

The nut member131may perform a function of pressing or releasing the piston121by moving in an advance direction or a reverse direction depending on a rotation direction of the spindle member135. In this case, the advance direction may be a direction in which the nut member131moves to approach the piston121. The reverse direction may be a direction in which the nut member131moves away from the piston121. In addition, the advance direction may be a direction in which the piston121moves to approach the brake pad113. The reverse direction may be a direction in which the piston121moves away from the brake pad113.

The spindle member135may include a shaft part136penetrating the rear portion of the caliper housing120to rotate by receiving the rotational force of the EPB actuator140, and a flange part137formed to extend in a radial direction from the shaft part136. One side of the shaft part136may be rotatably installed to penetrate a rear side of the cylinder123, and the other side of the shaft part136may be disposed in the piston121. In this case, one side of the shaft part136penetrating the cylinder123is connected to an output shaft of a reducer142to receive the rotational force of the actuator140.

The actuator140may include the motor141and the reducer142.

The motor141may press or release the piston121by moving the nut member131forward or backward by rotating the spindle member135.

The reducer142may be provided between the output side of the motor141and the spindle member135.

By having the above configuration, the electronic parking brake100may move the nut member131to press the piston121by rotating the spindle member135in one direction using the actuator140in a parking operation mode. The piston121pressed by the movement of the nut member131presses the inner pad plate111to bring the brake pad113into close contact with the brake disk D, thereby generating a clamping force.

In addition, the electronic parking brake100rotates the spindle member135in the opposite direction using the motor actuator140in a parking release mode, so that the nut member131pressed against the piston121may move backward. The pressure applied to the piston121may be released by the backward movement of the nut member131. As the pressure applied to the piston121is released, the brake pad113may be spaced apart from the brake disk D, thereby releasing the generated clamping force.

FIG.2illustrates a configuration of the electronic parking brake system according to an embodiment.

Referring toFIG.2, an electronic parking brake system200may include a front wheel motor141a, a rear wheel motor141b, a motor driving device210, and a controller220. The controller220may receive operation mode selection information when braking the vehicle while driving or when stopping the vehicle.

FIG.3illustrates an operation mode selector installed in a vehicle to which the electronic parking brake system according to an embodiment is applied.

Referring toFIG.3, an operation mode selector10may be installed on the center fascia CP provided inside the vehicle. The operation mode selector10may be provided to select an operation mode for operating at least one of an electronic front-wheel parking brake provided on a front wheel side and an electronic rear-wheel parking brake provided on a rear wheel side. The operation mode selector10is not limited thereto, and may be provided as a separate type switch inside the vehicle.

The operation mode selector10may be provided to select the operation mode when braking a vehicle1while driving or stopping the vehicle1. For example, the operation mode selector10may select the operation mode when a braking compensation function is required for an operation of a brake pedal of a driver, and transmit brake pedal operation information to the controller220in response to the selected operation mode. The operation mode selector10may select the operation mode when the braking compensation function is required for an emergency situation such as failure of the braking system and deterioration of braking performance, and transmit braking information to the controller220in response to the selected operation mode. The operation mode selector10may select the operation mode when the braking compensation function is required for the braking performance of the braking system that brakes or stops during driving, and transmit the braking information to the controller220in response to the selected operation mode. The braking system may be an electro-hydraulic braking device, an integrated dynamic brake (IDB), an anti-lock braking system (ABS), an electronic stability control (ESC), a traction control system (TCS), or the like.

FIG.4illustrates a configuration of the operation mode selector illustrated inFIG.3.

Referring toFIG.4, the operation mode selector10may include an all wheels parking (AWP) switch11provided to select a first operation mode for operating the electronic front-wheel parking brake and the electronic rear-wheel parking brake, a front wheel parking (FWP) switch12provided to select a second operation mode for operating the electronic front-wheel parking brake, and a rear wheel parking (RWP) switch13provided to select a third operation mode for operating the electronic rear-wheel parking brake. The AWP switch11, the FWP switch12, and the RWP switch13may transmit a first switch signal for the first operation mode, a second switch signal for the second operation mode, or a third switch signal for the third operation mode to the controller220according to a selection of the driver. The operation mode selector10may be provided to select any one of an AWP display window, a FWP display window, and a RWP display window, which are displayed through a display panel14of the center fascia CP, instead of the AWP switch11, the FWP switch12, and the RWP switch13.

FIG.5illustrates configurations of a motor driving device, a front wheel motor, and a rear wheel motor of the electronic parking brake system according to an embodiment.

Referring toFIG.5, the motor driving device210may drive at least one of the front wheel motor141aand the rear wheel motor141b. The motor driving device210may include a first motor driving device211, a second motor driving device212, a third motor driving device213, and a fourth motor driving device214. The front wheel motor141amay be provided in the electronic front-wheel parking brake provided on the front wheel side. The front wheel motor141amay include a front right wheel motor141a1and a front left wheel motor141a2. The front right wheel motor141a1may be driven by the first motor driving device211, and the front left wheel motor141a2may be driven by the second motor driving device212. The rear wheel motor141bmay be provided in the electronic rear-wheel parking brake provided on the rear wheel side. The rear wheel motor141bmay include a rear right wheel motor141b1and a rear left wheel motor141b2. The rear right wheel motor141b1may be driven by the third motor driving device213, and the rear left wheel motor141b2may be driven by the fourth motor driving device214.

The motor driving device210may drive the front wheel motor141aand the rear wheel motor141bin a forward rotation direction or a reverse rotation direction. For example, the motor driving device210may include an H-bridge circuit including a plurality of power switching devices to drive the front wheel motor141aand the rear wheel motor141bin the forward rotation direction or the reverse rotation direction.

The controller220may perform the parking operation mode or the parking release mode according to an operation signal of a parking switch operated by the driver or an operation signal generated by a program related to an operation of the electronic parking brake.

The controller220may press the piston121by moving the nut member131in the advance direction by rotating at least one of the front wheel motor141aand the rear wheel motor141bin one direction in the parking operation mode, thereby performing a parking operation (Apply) in which the brake pad113is brought into close contact with the brake disk D to generate a clamping force.

The controller220may release the piston121by moving the nut member131in the reverse direction by rotating at least one of the front wheel motor141aand the rear wheel motor141bin the opposite direction in the parking release mode, thereby performing a parking release (Release) in which the brake pad113being into close contact with the brake disk D is released to release the generated clamping force.

The electronic parking brake system200according to an embodiment allows the driver to select the operation mode for operating at least one of the electronic front-wheel parking brake and the electronic rear-wheel parking brake, so that the electronic front-wheel parking brake and the electronic rear-wheel parking brake are effectively operated according to a selection of the driver.

The controller220may include a processor221and a memory222.

The processor221may control the motor driving device210to operate at least one of the electronic front-wheel parking brake and the electronic rear-wheel parking brake in response to the operation mode of the received operation mode selection information. The operation mode selector10may output the operation mode selection information including the first operation mode for operating the electronic front-wheel parking brake and the electronic rear-wheel parking brake, the second operation mode for operating the electronic front-wheel parking brake, or the third operation mode for operating the electronic rear-wheel parking brake.

When the received operation mode is the first operation mode, the processor221may control the first motor driving device211and the second motor driving device212for respectively driving the front wheel motor141a, and may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear wheel motor141b. The first motor driving device211may drive the front right wheel motor141a1, the second motor driving device212may drive the front left wheel motor141a2, the third motor driving device213may drive the rear right wheel motor141b1, and the fourth motor driving device214may drive the rear left wheel motor141b2.

When the received operation mode is the second operation mode, the processor221may control the first motor driving device211and the second motor driving device212for respectively driving the front wheel motor141a. The first motor driving device211may drive the front right wheel motor141a1, the second motor driving device212may drive the front left wheel motor141a2.

When the received operation mode is the third operation mode, the processor221may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear wheel motor141b. The third motor driving device213may drive the rear right wheel motor141b1, and the fourth motor driving device214may drive the rear left wheel motor141b2.

When the received operation mode is the first operation mode, the processor221may receive wiring harness wiring connection information for the first operation mode. For example, the processor221may request the wiring harness wiring connection information for the first operation mode from a smart junction box (SJB) controller to control a smart junction box. The smart junction box uses an intelligent power switch (IPS), which is a semiconductor device having the same function as a fuse and a relay, so that the smart junction box may be reduced in size and weight compared to a conventional junction box. The smart junction box (SJB) controller is increasingly being integrated into a body control module (BCM).

The smart junction box may be electrically connected to the first motor driving device211for driving the front right wheel motor141a1, the second motor driving device212for driving the front left wheel motor141a2, the third motor driving device213for driving the rear right wheel motor141b1, and the fourth motor driving device214for driving the rear left wheel motor141b2, through a wiring harness.

Such the SJB controller or BCM may improve vehicle stability with various failure monitoring functions and failure diagnosis functions. The SJB controller or BCM may monitor and diagnose an electrical connection state with each of the motor driving devices211to214through the processor and transmit each wiring harness wiring connection information for each of the operation modes to the controller220. When an abnormal electrical connection state exists among the electrical connection states with the motor driving devices211to214, the SJB controller or BCM may transmit wiring harness wiring connection information for the abnormal electrical connection state to the controller220. When an abnormal electrical connection state exists among the electrical connection states with the motor driving devices211to214, the SJB controller or BCM may adjust a wiring connection of the wiring harness for a normal electrical connection, and may transmit wiring harness wiring connection information for the normal electrical connection state to the controller220when the normal electrical connection is achieved through the adjusted wiring connection of the wiring harness. Instead of the SJB controller or BCM, each ECU for controlling the braking system (ABS, ESC, IDB, etc.) may directly perform a function of changing the wiring connection of the wiring harness.

The processor221may control the first motor driving device211and the second motor driving device212for respectively driving the front wheel motor141abased on first wiring harness wiring connection information for driving the front wheel motor141ain the received wiring harness wiring connection information. The processor221may identify the first wiring harness wiring connection information for the first operation mode and recognize the electrical connection state with the first motor driving device211and the electrical connection state with the second motor driving device212. When the electrical connection state with the first motor driving device211and the electrical connection state with the second motor driving device212are normal, the processor221may control the first motor driving device211and the second motor driving device212for respectively driving the front wheel motor141a. The first motor driving device211may drive the front right wheel motor141a1, and the second motor driving device212may drive the front left wheel motor141a2.

The processor221may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear wheel motor141bbased on second wiring harness wiring connection information for driving the rear wheel motor141bin the received wiring harness wiring connection information. The processor221may identify the second wiring harness wiring connection information for the first operation mode and recognize the electrical connection state with the third motor driving device213and the electrical connection state with the fourth motor driving device214. When the electrical connection state with the third motor driving device213and the electrical connection state with the fourth motor driving device214are normal, the processor221may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear wheel motor141b. The third motor driving device213may drive the rear right wheel motor141b1, and the fourth motor driving device214may drive the rear left wheel motor141b2.

When the received operation mode is the second operation mode, the processor221may receive wiring harness wiring connection information for the second operation mode. The processor221may control the first motor driving device211and the second motor driving device212for respectively driving the front wheel motor141abased on the first wiring harness wiring connection information for driving the front wheel motor141ain the received wiring harness wiring connection information. The processor221may identify the first wiring harness wiring connection information for the second operation mode and recognize the electrical connection state with the first motor driving device211and the electrical connection state with the second motor driving device212. When the electrical connection state with the first motor driving device211and the electrical connection state with the second motor driving device212are normal, the processor221may control the first motor driving device211and the second motor driving device212for respectively driving the front wheel motor141a. The first motor driving device211may drive the front right wheel motor141a1, and the second motor driving device212may drive the front left wheel motor141a2.

When the received operation mode is the third operation mode, the processor221may receive wiring harness wiring connection information for the third operation mode. The processor221may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear wheel motor141bbased on the second wiring harness wiring connection information for driving the rear wheel motor141bin the received wiring harness wiring connection information. The processor221may identify the second wiring harness wiring connection information for the third operation mode and recognize the electrical connection state with the third motor driving device213and the electrical connection state with the fourth motor driving device214. When the electrical connection state with the third motor driving device213and the electrical connection state with the fourth motor driving device214are normal, the processor221may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear wheel motor141b. The third motor driving device213may drive the rear right wheel motor141b1, and the fourth motor driving device214may drive the rear left wheel motor141b2.

The processor221may control the motor driving device210that drives at least one of the front wheel motor141aand the rear wheel motor141bbased on at least one of the received parking switch operation information, brake pedal operation information, and braking information. In a situation where the processor221may receive the parking switch operation information and operate at least one of the electronic front-wheel parking brake and the electronic rear-wheel parking brake, the processor221may control the motor driving device210that drives at least one of the front wheel motor141aand the rear wheel motor141bto perform the braking compensation function, based on at least one of the brake pedal operation information and the braking information according to the selected operation mode.

The processor221may receive the parking switch operation information from the parking switch. The processor221may receive the brake pedal operation information from a brake pedal position sensor, and may receive the brake pedal operation information input or estimated from another system that performs CAN communication, which is an in-vehicle network, on behalf of the brake pedal position sensor. The processor221may receive the braking information input or estimated from a braking system performing CAN communication.

The processor221may include a signal processor for processing an operation mode selection signal, the wiring harness wiring connection information, the parking switch operation information, the brake pedal operation information, and the braking information, and a micro control unit (MCU) for generating a motor drive signal for actuating or deactivating the electronic parking brake100.

The memory222may store a program and/or data for the processor221to process the operation mode selection signal, the wiring harness wiring connection information, the parking switch operation information, the brake pedal operation information, and the braking information, and a program and/or data for the processor221to generate the motor drive signal for actuating or deactivating the electronic parking brake100.

The memory222may temporarily store the operation mode selection signal, the wiring harness wiring connection information, the parking switch operation information, the brake pedal operation information, and the braking information, and may temporarily store the result of processing the operation mode selection signal, the wiring harness wiring connection information, the parking switch operation information, the brake pedal operation information, and the braking information of the processor221.

The memory222may include a non-volatile memory such as flash memory, read only memory (ROM), and erasable programmable read only memory (EPROM) as well as a volatile memory such as S-RAM and D-RAM.

FIG.6illustrates an example of a control method of the electronic parking brake system according to an embodiment.

Referring toFIG.6, the controller220may receive the operation mode selection information for operating at least one of the electronic front-wheel parking brake and the electronic rear-wheel parking brake (610). The operation mode selector10may select the operation mode for operating at least one of the electronic front-wheel parking brake and the electronic rear-wheel parking brake. The operation mode selector10may select the first operation mode for operating the electronic front-wheel parking brake and the electronic rear-wheel parking brake, the second operation mode for operating the electronic front-wheel parking brake, or the third operation mode for operating the electronic rear-wheel parking brake. The AWP switch11may transmit the first switch signal for the first operation mode to the controller220, the FWP switch12may transmit the second switch signal for the second operation mode to the controller220, and the RWP switch13may transmit the third switch signal for the third operation mode to the controller220.

The controller220may drive at least one of the front wheel motor141aof the electronic front-wheel parking brake and the rear wheel motor141bof the electronic rear-wheel parking brake in response to the operation mode of the received operation mode selection information (620).

FIG.7illustrates a method of driving at least one of the front wheel motor and the rear wheel motor in the electronic parking brake system according to an embodiment.

Referring toFIG.7, the controller220may determine whether the operation mode of the received operation mode selection information is the first operation mode (621). When the first switch signal for the first operation mode is received, the controller220may determine that the driver selects the AWP switch11.

When the operation mode of the received operation mode selection information is the first operation mode, the controller220may control the first motor driving device211and the second motor driving device212for respectively driving the front right wheel motor141a1and the front left wheel motor141a2, and may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear right wheel motor141b1and the rear left wheel motor141b2(622).

When the operation mode of the received operation mode selection information is the first operation mode, the controller220may receive the wiring harness wiring connection information for the first operation mode.

Thereafter, the controller220may receive the first wiring harness wiring connection information for driving the front wheel motor141aand the second wiring harness wiring connection information for driving the rear wheel motor141bin the received wiring harness wiring connection information.

Thereafter, the controller220may control the first motor driving device211and the second motor driving device212for respectively driving the front right wheel motor141a1and the front left wheel motor141a2when the electrical connection state with the first motor driving device211and the electrical connection state with the second motor driving device212are normal based on the received first wiring harness wiring connection information, and may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear right wheel motor141b1and the rear left wheel motor141b2when the electrical connection state with the third motor driving device213and the electrical connection state with the fourth motor driving device214are normal based on the received second wiring harness wiring connection information (622).

When it is not the first operation mode as a result of the determination in the operation mode621, the controller220may determine whether the operation mode of the received operation mode selection information is the second operation mode (623). When the second switch signal for the second operation mode is received, the controller220may determine that the driver selects the FWP switch12.

When the operation mode of the received operation mode selection information is the second operation mode, the controller220may control the first motor driving device211and the second motor driving device212for respectively driving the front right wheel motor141a1and the front left wheel motor141a2(624).

When the operation mode of the received operation mode selection information is the second operation mode, the controller220may receive the wiring harness wiring connection information for the second operation mode.

Thereafter, the controller220may receive the first wiring harness wiring connection information for driving the front wheel motor141ain the received wiring harness wiring connection information.

Thereafter, when the electrical connection state with the first motor driving device211and the electrical connection state with the second motor driving device212are normal based on the received first wiring harness wiring connection information, the controller220may control the first motor driving device211and the second motor driving device212for respectively driving the front right wheel motor141a1and the front left wheel motor141a2(624).

When it is not the second operation mode as a result of the determination in the operation mode623, the controller220may determine whether the operation mode of the received operation mode selection information is the third operation mode (625). When the third switch signal for the third operation mode is received, the controller220may determine that the driver selects the RWP switch13.

When the operation mode of the received operation mode selection information is the third operation mode, the controller220may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear right wheel motor141b1and the rear left wheel motor141b2(626).

When the operation mode of the received operation mode selection information is the third operation mode, the controller220may receive the wiring harness wiring connection information for the third operation mode.

Thereafter, the controller220may receive the second wiring harness wiring connection information for driving the rear wheel motor141bin the received wiring harness wiring connection information.

Thereafter, when the electrical connection state with the third motor driving device213and the electrical connection state with the fourth motor driving device214are normal based on the received second wiring harness wiring connection information, the controller220may control the third motor driving device213and the fourth motor driving device214for respectively driving the rear right wheel motor141b1and the rear left wheel motor141b2(626).

When it is not the third operation mode as a result of the determination in the operation mode625, the controller220may determine that the driver does not select the operation mode selector10. The controller220may determine that the driver does not select the AWP switch11, the FWP switch12, or the RWP switch13.

The controller220may operate at least one of the electronic front-wheel parking brake and the electronic rear-wheel parking brake by driving at least one of the front-wheel motor141aand the rear-wheel motor141b(630).

FIG.8illustrates, as an example, an operation of an electronic front-wheel parking brake and an electronic rear-wheel parking brake according to a first operation mode in the electronic parking brake system according to an embodiment.

Referring toFIG.8, when the operation mode of the received operation mode selection information is the first operation mode, the controller220may transmit a driving command to the first motor driving device211, the second motor driving device212, the third motor driving device213, and the fourth motor driving device214to rotationally drive the front right wheel motor141a1, the front left wheel motor141a2, the rear right wheel motor141b1, and the rear left wheel motor141b2in an operation direction so as to operate electronic front-wheel parking brakes100aand100band electronic rear-wheel parking brakes100cand100d.

The first motor driving device211, the second motor driving device212, the third motor driving device213, and the fourth motor driving device214may rotationally drive the front right wheel motor141a1, the front left wheel motor141a2, the rear right wheel motor141b1, and the rear left wheel motor141b2in the operation direction to perform the braking compensation function based on at least one of the brake pedal operation information and the braking information according to the selected first operation mode.

The electronic front-wheel parking brakes100aand100band the electronic rear-wheel parking brakes100cand100dmay generate a clamping force necessary for braking the vehicle1while driving or for stopping the vehicle1by driving the front right wheel motor141a1, the front left wheel motor141a2, the rear right motor141b1, and the rear left motor141b2.

FIG.9illustrates, as another example, an operation of the electronic front-wheel parking brake and the electronic rear-wheel parking brake according to the first operation mode in the electronic parking brake system according to an embodiment.

Referring toFIG.9, when the operation mode of the received operation mode selection information is the first operation mode, the controller220may receive the wiring harness wiring connection information for the first operation mode.

Thereafter, when the electrical connection state with the first motor driving device211, the electrical connection state with the second motor driving device212, the electrical connection state with the third motor driving device213, and the electrical connection state with the fourth motor driving device214are normal based on the first wiring harness wiring connection information and the second wiring harness wiring connection information for driving the front wheel motor141aand the rear wheel motor141bin the received wiring harness wiring connection information, the controller220may transmit a driving command to the first motor driving device211, the second motor driving device212, the third motor driving device213, and the fourth motor driving device214to rotationally drive the front right wheel motor141a1, the front left wheel motor141a2, the rear right wheel motor141b1, and the rear left wheel motor141b2in the operation direction so as to operate the electronic front-wheel parking brakes100aand100band the electronic rear-wheel parking brakes100cand100d.

The first motor driving device211, the second motor driving device212, the third motor driving device213, and the fourth motor driving device214may rotationally drive the front right wheel motor141a1, the front left wheel motor141a2, the rear right wheel motor141b1, and the rear left wheel motor141b2in the operation direction to perform the braking compensation function based on at least one of the brake pedal operation information and the braking information according to the selected first operation mode.

The electronic front-wheel parking brakes100aand100band the electronic rear-wheel parking brakes100cand100dmay generate a clamping force necessary for braking the vehicle1while driving or for stopping the vehicle1by driving the front right wheel motor141a1, the front left wheel motor141a2, the rear right motor141b1, and the rear left motor141b2.

FIG.10illustrates, as an example, an operation of the electronic front-wheel parking brake according to a second operation mode in the electronic parking brake system according to an embodiment.

Referring toFIG.10, when the operation mode of the received operation mode selection information is the second operation mode, the controller220may transmit a driving command to the first motor driving device211and the second motor driving device212to rotationally drive the front right wheel motor141a1and the front left wheel motor141a2in the operation direction so as to operate the electronic front-wheel parking brakes100aand100b.

The first motor driving device211and the second motor driving device212may rotationally drive the front right wheel motor141a1and the front left wheel motor141a2in the operation direction to perform the braking compensation function based on at least one of the brake pedal operation information and the braking information according to the selected second operation mode.

The electronic front-wheel parking brakes100aand100bmay generate a clamping force necessary for stopping the vehicle1by driving the front right wheel motor141a1and the front left wheel motor141a2.

FIG.11illustrates, as another example, an operation of the electronic front-wheel parking brake according to the second operation mode in the electronic parking brake system according to an embodiment.

Referring toFIG.11, when the operation mode of the received operation mode selection information is the second operation mode, the controller220may receive the wiring harness wiring connection information for the second operation mode.

Thereafter, when the electrical connection state with the first motor driving device211and the electrical connection state with the second motor driving device212are normal based on the first wiring harness wiring connection information for driving the front wheel motor141ain the received wiring harness wiring connection information, the controller220may transmit a driving command to the first motor driving device211and the second motor driving device212to rotationally drive the front right wheel motor141a1and the front left wheel motor141a2in the operation direction so as to operate the electronic front-wheel parking brakes100aand100b.

The first motor driving device211and the second motor driving device212may rotationally drive the front right wheel motor141a1and the front left wheel motor141a2in the operation direction to perform the braking compensation function based on at least one of the brake pedal operation information and the braking information according to the selected second operation mode.

The electronic front-wheel parking brakes100aand100bmay generate a clamping force necessary for braking the vehicle1while driving or for stopping the vehicle1by driving the front right wheel motor141a1and the front left wheel motor141a2.

FIG.12illustrates, as an example, an operation of the electronic rear-wheel parking brake according to a third operation mode in the electronic parking brake system according to an embodiment.

Referring toFIG.12, when the operation mode of the received operation mode selection information is the third operation mode, the controller220may transmit a driving command to the third motor driving device213and the fourth motor driving device214to rotationally drive the rear right wheel motor141b1and the rear left wheel motor141b2in the operation direction so as to operate the electronic rear-wheel parking brakes100cand100d.

The third motor driving device213and the fourth motor driving device214may rotationally drive the rear right wheel motor141b1and the rear left wheel motor141b2in the operation direction to perform the braking compensation function based on at least one of the brake pedal operation information and the braking information according to the selected third operation mode.

The electronic rear-wheel parking brakes100cand100dmay generate a clamping force necessary for braking the vehicle1while driving or for stopping the vehicle1by driving the rear right wheel motor141b1and the rear left wheel motor141b2.

FIG.13illustrates, as another example, an operation of the electronic rear-wheel parking brake according to the third operation mode in the electronic parking brake system according to an embodiment.

Referring toFIG.13, when the operation mode of the received operation mode selection information is the third operation mode, the controller220may receive the wiring harness wiring connection information for the third operation mode.

Thereafter, when the electrical connection state with the third motor driving device213and the electrical connection state with the fourth motor driving device214are normal based on the second wiring harness wiring connection information for driving the rear wheel motor141bin the received wiring harness wiring connection information, the controller220may transmit a driving command to the third motor driving device213and the fourth motor driving device214to rotationally drive the rear right wheel motor141b1and the rear left wheel motor141b2in the operation direction so as to operate the electronic rear-wheel parking brakes100cand100d.

The third motor driving device213and the fourth motor driving device214may rotationally drive the rear right wheel motor141b1and the rear left wheel motor141b2in the operation direction to perform the braking compensation function based on at least one of the brake pedal operation information and the braking information according to the selected third operation mode.

The electronic rear-wheel parking brakes100cand100dmay generate a clamping force necessary for braking the vehicle1while driving or for stopping the vehicle1by driving the rear right wheel motor141b1and the rear left wheel motor141b2.

As described above, the electronic parking brake system200according to an embodiment may allow the driver to select the operation of the electronic front-wheel parking brake and the operation of the electronic rear-wheel parking brake when the braking compensation function is required for the operation of the brake pedal of the driver, when the brake compensation function is required for an emergency situation such as failure of the brake system and deterioration of brake performance, when the brake compensation function is required for the braking performance of the braking system that brakes or stops while driving, and when the brake compensation function is required for the failure of the electronic parking brake on one side, thereby efficiently operating the electronic front-wheel parking brake and the electronic rear-wheel parking brake according to a selection of the driver.

As is apparent from the above, according to one aspect of the disclosure, an electronic front-wheel parking brake and an electronic rear-wheel parking brake can be efficiently operated according to a selection of a driver.