KR20200108676A - Electric brake system and controlling method thereof - Google Patents

Abstract

An electronic brake system according to an embodiment of the disclosed present invention includes: a hydraulic pressure providing unit including a piston provided to be able to move forward or backward; a driving unit for moving the piston; a storage unit for storing movement information regarding movement of the piston; and a control unit that determines a position to which the piston is to be moved based on the previously stored movement information when a system driving (ON) signal is received, and controls the driving unit to move the piston to the determined position.

Description

Electronic brake system and its control method {ELECTRIC BRAKE SYSTEM AND CONTROLLING METHOD THEREOF}

The present invention relates to an electronic brake system, and more particularly, to an electronic brake system that generates a braking force by using an electrical signal corresponding to the displacement of a brake pedal.

A vehicle is essentially equipped with a brake system for braking. Recently, several types of systems have been proposed to obtain a more powerful and stable braking force.

Examples of the brake system include the Anti-Lock Brake System (ABS), which prevents wheel slipping during braking, and the brake traction control system (BTCS: Brake), which prevents slipping of the driving wheels during sudden start or rapid acceleration of the vehicle. Traction Control System), and the Electronic Stability Control System (ESC), which controls the brake fluid pressure by combining the anti-lock brake system and traction control to stably maintain the driving state of the vehicle.

In the conventional brake system, when the driver presses the brake pedal, the hydraulic pressure required for braking is supplied to the wheel cylinder using a mechanically connected booster, but recently, when the driver presses the brake pedal, the driver's pedal displacement sensor detects the displacement of the brake pedal. Electronic brake systems including a hydraulic pressure supply device for supplying hydraulic pressure required for braking to a wheel cylinder by receiving a braking intention as an electrical signal are widely used.

One aspect provides an electronic brake system and a control method for providing a hydraulic pressure providing unit including a piston provided to be able to move forward or backward.

As a technical means for achieving the above-described technical problem, an electronic brake system according to an aspect includes: a hydraulic pressure providing unit including a piston provided to be able to move forward or backward; A drive unit for moving the piston; A storage unit for storing movement information regarding the movement of the piston; And a controller configured to determine a position to move the piston based on pre-stored movement information when a system driving (ON) signal is received, and control the driving unit to move the piston to the determined position.

In addition, it further comprises a position sensor for sensing the position information of the piston; the control unit, when a system off (OFF) command is received, controls the drive unit to move the piston to the first position, the piston It is possible to control the storage unit to identify whether the movement to the first position has been completed, to generate movement information including the identification result and the location information, and to store the generated movement information.

In addition, the controller may identify whether the piston has finished moving to the first position at a first time point after a predetermined time after receiving the system off command.

In addition, the control unit may control the storage unit to store movement information including the identification result and position information of the piston at the first time point.

In addition, when the system driving signal is received, the control unit determines whether the piston has completed movement to the first position based on the identification result, and indicates that the piston has completed movement to the first position. If confirmed, the position to move the piston can be determined as the second position.

In addition, when the system driving signal is received, the control unit checks whether the piston has finished moving to the first position based on the identification result, and the piston has not completed moving to the first position. If confirmed, the position to move the piston can be determined as the first position.

In addition, when it is confirmed that the piston has finished moving to the first position, the control unit checks whether the position information is included in a predetermined range, and when the position information is included in a predetermined range, the piston The position to be moved can be determined as the second position.

In addition, when the position information is not included in a predetermined range, the control unit may determine a position to move the piston as the first position.

In addition, the first point in time may be a point in time before a predetermined time from the point in time when the system is completed.

An electronic brake system according to another aspect controls the drive unit to move the piston to a first position when a system OFF command is received; Identify whether the piston has finished moving to the first position; Generating movement information including the identification result and the location information, and storing the generated movement information; When a system drive (ON) signal is received, determining a position to move the piston based on the movement information; And moving the piston to the determined position.

In addition, identifying whether the piston has finished moving to the first position may include whether the piston has finished moving to the first position at a first time point after a predetermined time after receiving the system off command. To identify; may include.

In addition, storing the generated movement information may include storing movement information including the identification result and position information of the piston at the first time point.

In addition, determining a position to move the piston may include, when the system driving signal is received, checking whether the piston has completed moving to the first position based on the identification result; And when it is confirmed that the piston has finished moving to the first position, determining a position to move the piston as a second position.

In addition, determining a position to move the piston may include, when the system driving signal is received, checking whether the piston has completed moving to the first position based on the identification result; And when it is confirmed that the piston has not completed the movement to the first position, determining a position to move the piston as the first position.

In addition, determining a position to move the piston may include, when it is confirmed that the piston has finished moving to the first position, checking whether the position information is included in a predetermined range; And determining a position to move the piston as a second position when the position information is included in a predetermined range.

In addition, determining a position to move the piston may include determining a position to move the piston as a first position if the position information is not included in a predetermined range.

In addition, the first point in time may be a point in time before a predetermined time from the point in time when the system is completed.

According to an electronic brake system and a control method thereof according to an aspect, a system initialization setting time can be shortened and a time delay occurring in providing a braking function to a user can be shortened, so that user convenience can be increased.

1 is a hydraulic circuit diagram showing an electronic brake system in a non-braking state according to an exemplary embodiment.
2 is a control block diagram of an electronic brake system according to an embodiment.
3 is an enlarged view showing a hydraulic pressure providing unit according to an embodiment.
4 is a flowchart illustrating a method of controlling an electronic brake system according to an exemplary embodiment.
5 is a flowchart illustrating a method of controlling an electronic brake system according to an exemplary embodiment.

The same reference numerals refer to the same elements throughout the specification. This specification does not describe all elements of the embodiments, and general content or content overlapping between the embodiments in the technical field to which the present invention pertains will be omitted. The term'unit, module, member, block' used in the specification may be implemented as software or hardware, and according to embodiments, a plurality of'units, modules, members, blocks' may be implemented as one component, It is also possible for one'unit, module, member, block' to include a plurality of components.

Throughout the specification, when a part is said to be "connected" with another part, this includes not only the case of being directly connected, but also the case of indirect connection, and the indirect connection includes connection through a wireless communication network. do.

In addition, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

Terms such as first and second are used to distinguish one component from other components, and the component is not limited by the above-described terms.

Singular expressions include plural expressions, unless the context clearly has exceptions.

In each step, the identification code is used for convenience of explanation, and the identification code does not describe the order of each step, and each step may be implemented differently from the specified order unless a specific sequence is clearly stated in the context. have.

Hereinafter, the operating principle and embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a hydraulic circuit diagram showing an electronic brake system in a non-braking state according to an exemplary embodiment.

Referring to FIG. 1, the electronic brake system 1 typically includes a master cylinder 20 that generates hydraulic pressure, a reservoir 30 that is coupled to an upper portion of the master cylinder 20 to store oil, and a brake pedal ( An input rod 12 that pressurizes the master cylinder 20 according to the foot force of 10), a wheel cylinder 40 that brakes each wheel (RR, RL, FR, FL) by transmitting hydraulic pressure, and a brake pedal A pedal displacement sensor 11 that senses the displacement of (10) and a simulation device 50 that provides a reaction force according to the foot of the brake pedal 10 are provided.

The master cylinder 20 is configured to have at least one chamber to generate hydraulic pressure. For example, the master cylinder 20 is configured to have two chambers, a first piston 21a and a second piston 22a are provided in each chamber, and the first piston 21a is an input rod 12 ) Can be connected. In addition, the master cylinder 20 may form first and second hydraulic ports 24a and 24b through which hydraulic pressure is discharged from the two chambers, respectively.

In addition, a first spring (21b) is provided between the first piston (21a) and the second piston (22a) of the master cylinder (20), and between the end of the second piston (22a) and the master cylinder (20). 2 springs 22b may be provided.

The first spring 21b and the second spring 22b are provided in each of the two chambers, and as the displacement of the brake pedal 10 varies, the first piston 21a and the second piston 22a are compressed. The elastic force is stored in the spring 21b and the second spring 22b. And when the force pushing the first piston (21a) is less than the elastic force, the first and second pistons (21a, 22a) are pushed to the original state by using the stored elastic force of the first spring (21b) and the second spring (22b). I can.

The simulation device 50 includes a simulation chamber 51 provided to store oil flowing out from the first hydraulic port 24a of the master cylinder 20, and a reaction piston 52 provided in the simulation chamber 51, and elastically support it. A pedal simulator having a reaction force spring 53 and a simulator valve 54 connected to the rear end of the simulation chamber 51.

The reaction piston 52 and the reaction spring 53 are installed to have a certain range of displacement in the simulation chamber 51 by oil flowing into the simulation chamber 51.

Meanwhile, the reaction spring 53 shown in the drawings is only one embodiment capable of providing an elastic force to the reaction force piston 52, and may include various embodiments capable of storing the elastic force by shape deformation. For example, it includes various members capable of storing elastic force by being made of a material such as rubber or having a coil or plate shape.

The simulator valve 54 may be provided in a flow path connecting the rear end of the simulation chamber 51 and the reservoir 30. The front end of the simulation chamber 51 may be connected to the master cylinder 20, and the rear end of the simulation chamber 51 may be connected to the reservoir 30 through the simulator valve 54. Therefore, even when the reaction force piston 52 returns, the oil in the reservoir 30 flows through the simulator valve 54, so that the entire interior of the simulation chamber 51 may be filled with oil.

Meanwhile, in the drawing, several reservoirs 30 are shown, and each reservoir 30 uses the same reference numeral. However, these reservoirs may be provided with the same parts or different parts. For example, the reservoir 30 connected to the simulation device 50 may be the same as the reservoir 30 connected to the master cylinder 20, or may store oil separately from the reservoir 30 connected to the master cylinder 20. It can be a repository with

Meanwhile, the simulator valve 54 may be configured as a normally closed solenoid valve that maintains a normally closed state. The simulator valve 54 is opened when the driver applies a pedal effort to the brake pedal 10 and can deliver the oil in the simulation chamber 51 to the reservoir 30.

In addition, a simulator check valve 55 may be installed between the pedal simulator and the reservoir 30 so as to be connected in parallel with the simulator valve 54. The simulator check valve 55 allows the oil in the reservoir 30 to flow into the simulation chamber 51, but the oil in the simulation chamber 51 flows into the reservoir 30 through a flow path in which the check valve 55 is installed. Can block things. When the pedal effort of the brake pedal 10 is released, since oil can be supplied into the simulation chamber 51 through the simulator check valve 55, a rapid return of the pedal simulator pressure can be ensured.

Since the inside of the simulation chamber 51 is always filled with oil, friction of the reaction force piston 52 is minimized when the simulation device 50 is operated, thereby improving the durability of the simulation device 50 and preventing foreign matter from entering from the outside. Can be blocked.

The electronic brake system 1 according to an embodiment includes a hydraulic pressure supply device 100 that mechanically operates by receiving the driver's braking intention as an electrical signal from the pedal displacement sensor 11 that senses the displacement of the brake pedal 10. , The hydraulic control unit 200 composed of first and second hydraulic circuits 201 and 202 for controlling the flow of hydraulic pressure delivered to the wheel cylinder 40 provided on each of the two wheels RR, RL, FR, and FL. ), a first cut valve 261 provided in a first backup passage 251 connecting the first hydraulic port 24a and the first hydraulic circuit 201 to control the flow of hydraulic pressure, and a second hydraulic port A second cut valve 262 provided in the second backup passage 252 connecting the 24b and the second hydraulic circuit 202 to control the flow of hydraulic pressure, and a hydraulic pressure supply device based on hydraulic pressure information and pedal displacement information It may include an electronic control unit (ECU, not shown) that controls 100 and the valves 54, 60, 232, 233, 243, 250.

The hydraulic pressure supply device 100 includes a hydraulic pressure providing unit 110 providing oil pressure delivered to the wheel cylinder 40, a motor 120 generating rotational force by an electrical signal from the pedal displacement sensor 11, and a motor. It may include a power conversion unit 130 that converts the rotational motion of 120 into linear motion and transmits it to the hydraulic pressure providing unit 110. Alternatively, the hydraulic pressure providing unit 110 may be operated not by a driving force supplied from the motor 120 but by a pressure supplied from a high pressure accumulator.

Next, flow paths 211, 212, 213, 214, 215 and valves 231, 232, 233, 241, 242, 243 connected to the first pressure chamber 112 and the second pressure chamber 113 Let's explain.

The first hydraulic flow path 211 is branched into a second hydraulic flow path 212 in communication with the first hydraulic circuit 201 and a third hydraulic flow path 213 in communication with the second hydraulic circuit 202. Accordingly, hydraulic pressure can be transmitted to both the first hydraulic circuit 201 and the second hydraulic circuit 202 by the advance of the hydraulic piston 114.

In addition, the electronic brake system 1 according to an embodiment is provided in the second and third hydraulic channels 212 and 213, respectively, and a first control valve 231 and a second control valve 232 for controlling the flow of oil. It may include.

In addition, the first control valve 231 may be provided as a check valve that allows only oil flow in a direction from the first pressure chamber 112 to the first hydraulic circuit 201 and blocks oil flow in the opposite direction. . That is, while the first control valve 231 allows the hydraulic pressure of the first pressure chamber 112 to be transferred to the first hydraulic circuit 201, the hydraulic pressure of the first hydraulic circuit 201 is reduced to the second hydraulic flow path 212 It is possible to prevent leakage into the first pressure chamber 112 through ).

In addition, the second control valve 232 may be provided as a solenoid valve capable of controlling the flow in both directions of the third hydraulic flow path 213. That is, the second control valve 232 allows the hydraulic pressure of the first pressure chamber 112 to be transferred to the second hydraulic circuit 202 during braking, and the hydraulic pressure of the second hydraulic circuit 202 when braking is released. It may be allowed to flow into the first pressure chamber 112 through the third hydraulic flow path 213.

In addition, the second control valve 232 may be provided as a normal closed type solenoid valve that is normally closed and operates to open the valve upon receiving an open signal from the electronic control unit.

In addition, the fourth hydraulic flow path 214 may be provided to communicate the second pressure chamber 113 and the third hydraulic flow path 213.

In addition, the electronic brake system 1 according to the first embodiment of the present invention may include a fifth hydraulic flow path 215 communicating the first hydraulic circuit 201 and the second hydraulic circuit 202. As an example, the fifth hydraulic flow path 215 may be provided to communicate the second hydraulic flow path 212 and the third hydraulic flow path 213, and specifically, one side of the fifth hydraulic flow path 215 is a first control valve. It is connected to the downstream of the 231, the other side may be connected to the downstream of the second control valve 232.

In addition, the electronic brake system 1 according to an embodiment is provided in the fifth hydraulic flow path 215 communicating the first pressure chamber 112 and the second pressure chamber 113 to control the flow of oil. It may include (250). As an example, the circuit balance valve 250 may be installed in the fifth hydraulic passage 215 communicating the second hydraulic passage 212 and the third hydraulic passage 213.

In addition, the circuit balance valve 250 may be provided as a solenoid valve capable of controlling the flow in both directions of the fifth hydraulic flow path 215. That is, the circuit balance valve 250 allows the hydraulic pressure of the second hydraulic flow path 212 to be transferred to the third hydraulic flow path 213, and the hydraulic pressure of the third hydraulic flow path 213 is reduced to the second hydraulic flow path 212. ) Can be allowed.

In addition, the circuit balance valve 250 may be provided as a normal closed type solenoid valve that is normally closed and operates to open the valve upon receiving an open signal from the electronic control unit.

Further, the second pressure chamber 113 may be in communication with both the first hydraulic circuit 201 and the second hydraulic circuit 202. That is, the fourth hydraulic flow path 214 joins the third hydraulic flow path 213 and communicates with the second hydraulic circuit 202, branches off from the third hydraulic flow path 213, and merges with the second hydraulic flow path 212. It may be communicated with the first hydraulic circuit 201 through the fifth hydraulic flow path 215. Accordingly, hydraulic pressure can be transmitted to both the first hydraulic circuit 201 and the second hydraulic circuit 202 by the reverse of the hydraulic piston 114.

As the hydraulic piston 114 moves backward, two operations are possible. First, it is possible to release the braking force by returning the oil of the first and second hydraulic circuits 201 and 202 to the first pressure chamber 112 by using the negative pressure generated in the first pressure chamber 112. Second, the oil in the second pressure chamber 113 may be transferred to the first and second hydraulic circuits 201 and 202 using the hydraulic pressure generated in the second pressure chamber 113 to apply a braking force.

The second control valve 232 and the third control valve 233 control the flows of the third hydraulic flow path 213 and the fourth hydraulic flow path 214, respectively, thereby enabling selection of the above two operations. That is, when the second control valve 232 opens the third hydraulic flow path 213 and the third control valve 233 closes the fourth hydraulic flow path 214, the first and second hydraulic circuits 201, The oil in 202 can return to the first pressure chamber 112 to release the braking force. Conversely, the second control valve 232 closes the third hydraulic flow path 213 and the third control valve 233 is When the fourth hydraulic flow path 214 is opened, the oil in the second pressure chamber 113 is transferred to the first and second hydraulic circuits 201 and 202 to apply a braking force.

In addition, the electronic brake system 1 according to an embodiment is provided in the first and second dump passages 116 and 117, respectively, and a first dump valve 241 and a second dump valve 242 for controlling the flow of oil. It may further include. The dump valves 241 and 242 may be check valves that open only a direction from the reservoir 30 to the first or second pressure chambers 112 and 113 and close the opposite direction. That is, the first dump valve 241 allows oil to flow from the reservoir 30 to the first pressure chamber 112, but blocks the flow of oil from the first pressure chamber 112 to the reservoir 30. It may be a check valve, and the second dump valve 242 allows oil to flow from the reservoir 30 to the second pressure chamber 113, but the oil flows from the second pressure chamber 113 to the reservoir 30. Flowing can be a check valve to shut off.

In addition, the second dump passage 117 may include a bypass passage, and the bypass passage includes a third dump valve 243 that controls the oil flow between the second pressure chamber 113 and the reservoir 30. Can be installed.

The third dump valve 243 may be provided as a solenoid valve capable of controlling the flow in both directions, and is open in a normal state, but is operated to close when a closing signal is received from the electronic control unit. type) solenoid valve.

The hydraulic pressure providing unit 110 of the electronic brake system 1 according to the first embodiment of the present invention may operate in a double-acting manner. That is, as the hydraulic piston 114 advances, the hydraulic pressure generated in the first pressure chamber 112 is transmitted to the first hydraulic circuit 201 through the first hydraulic flow path 211 and the second hydraulic flow path 212 to the right side. The wheel cylinder 40 installed on the front wheel FR and the left rear wheel LR can be operated, and transmitted to the second hydraulic circuit 202 through the first hydraulic flow path 211 and the third hydraulic flow path 213 As a result, the wheel cylinder 40 installed on the right rear wheel RR and the left front wheel FL can be operated.

Similarly, as the hydraulic piston 114 moves backward, the hydraulic pressure generated in the second pressure chamber 113 is transmitted to the first hydraulic circuit 201 through the fourth hydraulic channel 214 and the second hydraulic channel 212 to the right side. The wheel cylinder 40 installed on the front wheel FR and the left rear wheel LR can be operated, and transmitted to the second hydraulic circuit 202 through the fourth hydraulic channel 214 and the third hydraulic channel 213 As a result, the wheel cylinder 40 installed on the right rear wheel RR and the left front wheel FL can be operated.

In addition, the negative pressure generated in the first pressure chamber 112 while the hydraulic piston 114 moves backward is absorbed by the oil of the wheel cylinder 40 installed in the right front wheel FR and the left rear wheel LR, It can be transmitted to the first pressure chamber 112 through the 201 and the second hydraulic flow path 212, and the oil of the wheel cylinder 40 installed in the right rear wheel RR and the left front wheel FL is sucked. It can be transmitted to the first pressure chamber 112 through the second hydraulic circuit 202 and the third hydraulic flow path 213.

Next, the motor 120 and the power conversion unit 130 of the hydraulic pressure supply device 100 will be described.

The motor 120 is a device that generates rotational force by a signal output from an electronic control unit (ECU, not shown), and may generate rotational force in a forward or reverse direction. The rotational angular speed and rotational angle of the motor 120 can be precisely controlled. Since the motor 120 is a well-known technique, detailed description will be omitted.

Meanwhile, the electronic control unit controls the valves 54, 60, 233 and 243 provided in the electronic brake system 1 of the present invention to be described later, including the motor 120. An operation in which the plurality of valves are controlled according to the displacement of the brake pedal 10 will be described later.

The driving force of the motor 120 generates displacement of the hydraulic piston 114 through the power conversion unit 130, and the hydraulic pressure generated as the hydraulic piston 114 slides in the pressure chamber is converted into the first and second hydraulic flow paths. It is transmitted to the wheel cylinder 40 installed on each wheel RR, RL, FR, and FL through (211, 212).

The power conversion unit 130 is a device that converts rotational force into linear motion, and may include, for example, a worm shaft 131, a worm wheel 132, and a drive shaft 133.

The worm shaft 131 may be integrally formed with the rotational shaft of the motor 120, and a worm is formed on the outer circumferential surface to engage the worm wheel 132 to rotate the worm wheel 132. The worm wheel 132 is connected to mesh with the drive shaft 133 to move the drive shaft 133 linearly, and the drive shaft 133 is connected to the hydraulic piston 114 to slide the hydraulic piston 114 in the cylinder block 111 Move.

When the above operations are described again, a signal sensed by the pedal displacement sensor 11 while displacement occurs in the brake pedal 10 is transmitted to the electronic control unit, and the electronic control unit drives the motor 120 in one direction. The worm shaft 131 is rotated in one direction. The rotational force of the worm shaft 131 is transmitted to the drive shaft 133 via the worm wheel 132, and the hydraulic piston 114 connected to the drive shaft 133 moves forward to generate hydraulic pressure in the first pressure chamber 112.

On the contrary, when the pedal effort is removed from the brake pedal 10, the electronic control unit drives the motor 120 in the opposite direction so that the worm shaft 131 rotates in the opposite direction. Accordingly, the worm wheel 132 also rotates in the opposite direction, and the hydraulic piston 114 connected to the drive shaft 133 returns (while moving backward) to generate negative pressure in the first pressure chamber 112.

On the other hand, it is possible to generate hydraulic pressure and negative pressure in the opposite direction. That is, while displacement occurs in the brake pedal 10, the signal sensed by the pedal displacement sensor 11 is transmitted to the electronic control unit (ECU, not shown), and the electronic control unit drives the motor 120 in the opposite direction. To rotate the worm shaft 131 in the opposite direction. The rotational force of the worm shaft 131 is transmitted to the drive shaft 133 via the worm wheel 132, and the hydraulic piston 114 connected to the drive shaft 133 moves backward to generate hydraulic pressure in the second pressure chamber 113.

Conversely, when the pedal effort is removed from the brake pedal 10, the electronic control unit drives the motor 120 in one direction so that the worm shaft 131 rotates in one direction. Accordingly, the worm wheel 132 also rotates in the opposite direction and the hydraulic piston 114 connected to the drive shaft 133 returns (while moving forward) to generate negative pressure in the second pressure chamber 113.

As described above, the hydraulic pressure supply device 100 serves to transmit the hydraulic pressure to the wheel cylinder 40 or suck the hydraulic pressure to the reservoir 30 according to the rotational direction of the rotational force generated from the motor 120.

On the other hand, when the motor 120 rotates in one direction, hydraulic pressure may be generated in the first pressure chamber 112 or negative pressure may be generated in the second pressure chamber 113. Whether to brake by using the hydraulic pressure or to reduce the negative pressure Whether to release the braking by using can be determined by controlling the valves 54, 60, 233, 243. This will be described in detail later.

Although not shown in the drawing, the power conversion unit 130 may be configured as a ball screw nut assembly. For example, a screw formed integrally with the rotation shaft of the motor 120 or connected to rotate with the rotation shaft of the motor 120, and a ball nut that is screwed with the screw in a state where rotation is restricted to move linearly according to the rotation of the screw. Can be. The hydraulic piston 114 is connected to the ball nut of the power conversion unit 130 to pressurize the pressure chamber by linear motion of the ball nut. The structure of the ball screw nut assembly is a known technique that converts rotational motion into linear motion, and a detailed description thereof will be omitted.

In addition, it should be understood that the power conversion unit 130 according to an embodiment of the present invention can be adopted in any structure as long as it can convert rotational motion into linear motion other than the structure of the ball screw nut assembly.

In addition, the electronic brake system 1 according to an embodiment includes the first and the first and the first capable of supplying the oil discharged from the master cylinder 20 directly to the wheel cylinder 40 at an abnormal operation (fallback mode). It may further include second backup passages (251, 252).

A first cut valve 261 for controlling the flow of oil may be provided in the first backup passage 251, and a second cut valve 262 for controlling the flow of oil may be provided in the second backup passage 252. have. In addition, the first backup passage 251 connects the first hydraulic port 24a and the first hydraulic circuit 201, and the second backup passage 252 has a second hydraulic port 24b and a second hydraulic circuit ( 202) can be connected.

In addition, the first and second cut valves 261 and 262 may be provided as normal open type solenoid valves that are open in a normal state and operate to close the valve when a closing signal is received from the electronic control unit. have.

The hydraulic control unit 200 may include a first hydraulic circuit 201 and a second hydraulic circuit 202 that respectively control two wheels by receiving hydraulic pressure. As an example, the first hydraulic circuit 201 may control the right front wheel FR and the left rear wheel RL, and the second hydraulic circuit 202 may control the left front wheel FL and the right rear wheel RR. . In addition, a wheel cylinder 40 is installed on each of the wheels FR, FL, RR, and RL, and braking is performed by receiving hydraulic pressure.

The first hydraulic circuit 201 is connected to the first hydraulic flow path 211 and the second hydraulic flow path 212 to receive hydraulic pressure from the hydraulic pressure supply device 100, and the second hydraulic circuit 202 is a first hydraulic flow path. It is connected to 211 and the third hydraulic flow path 213 to receive hydraulic pressure from the hydraulic pressure supply device 100.

In addition, the hydraulic control unit 200 may be connected to the backup passages 251 and 252. As an example, the first hydraulic circuit 201 is connected to the first backup flow path 251 to receive hydraulic pressure from the master cylinder 20, and the second hydraulic circuit 202 is connected to the second backup flow path 252. Hydraulic pressure may be provided from the master cylinder 20.

Unexplained reference numeral "PS2" is a backup flow pressure sensor that measures the oil pressure of the master cylinder 20. And "MPS" is a motor position sensor that measures the rotation angle of the motor 120 or the rotation speed of the motor.

Meanwhile, a conventional electronic brake system performs an operation of setting a position of a hydraulic piston to a preset initial position in order to generate a braking force in an initial driving stage when the system starts driving.

This preset initial position may be set to have a predetermined distance value with respect to the reference position. Therefore, in order to move the position of the hydraulic piston to the preset initial position, it is necessary to move the position of the hydraulic piston to the reference position in advance.

However, in the operation of moving the hydraulic piston to the reference position, it may take an excessive amount of time to move the hydraulic piston according to the position of the hydraulic piston. Therefore, a time delay may occur in providing the braking function.

Hereinafter, the operation of the electronic brake system 1 according to an embodiment will be described in detail.

2 is a control block diagram of the electronic brake system 1 according to an embodiment.

Referring to FIG. 2, the electronic brake system 1 according to an embodiment includes a brake device 310 capable of generating braking force, a control unit 320 capable of overall controlling components in the electronic brake system, and an electronic brake. It may include a storage unit 330 that can store various information related to the system.

The brake device 310 may include a hydraulic pressure providing unit 110, a driving unit 311, and a position sensor 312.

The hydraulic pressure providing unit 110 may provide oil pressure transmitted to the wheel cylinder 40 and may include a piston provided to be able to move forward or backward. In this case, the piston may mean a hydraulic piston (114). Description of this is the same as that of FIG. 1.

The driving unit 311 may supply driving force to the hydraulic pressure providing unit 110. The driving unit 311 may drive the hydraulic pressure providing unit 110 by supplying a driving force to the hydraulic pressure providing unit 110 according to a control signal from the controller 320 to be described later.

Specifically, the driving unit 311 may generate displacement of the hydraulic piston 114 of the hydraulic pressure providing unit 110. That is, the position of the hydraulic piston 114 can be moved.

To this end, the driving unit 311 may include a motor 120. In addition, the driving unit 311 may further include a power conversion unit 130. Descriptions of the motor 120 and the power conversion unit 130 are the same as those of FIG. 1.

The position sensor 312 may detect the position of the hydraulic piston 114. Through this, the position sensor 312 may measure the stroke value of the hydraulic piston 114.

In addition, the position sensor 312 may detect whether the hydraulic piston 114 is located at a specific position. For example, the position sensor 312 is the position where the hydraulic piston 114 has the minimum volume of the second pressure chamber 113 or the position where the first pressure chamber 112 has the largest volume, that is, the hydraulic piston 114 It can be detected whether the rear end of the cylinder block 111 is located at a position in contact with the rear end in the opening direction.

To this end, the position sensor 312 may be implemented as a motor position sensor (MPS of FIG. 1), but is not limited thereto and may be implemented as a separate sensor capable of detecting the position of the hydraulic piston 114.

The position of the hydraulic piston 114 sensed by the position sensor 312 may be a control basis for the controller 320 to be described later.

The control unit 320 may perform overall control of various components in the electronic brake system 1.

When the system driving (ON) signal is received, the control unit 320 determines a position to move the hydraulic piston 114 based on the previously stored movement information, and the driving unit 311 to move the hydraulic piston 114 to the determined position. ) Can be controlled.

In this case, the system driving signal means an initialization command signal for the electronic brake system 1 and may include a start-on signal or a wake-up signal for the electronic brake system 1. For example, when the electronic brake system 1 according to an embodiment is implemented in a vehicle, not only when the vehicle is turned on, but also before the vehicle is turned on, the door is opened or the user presses the brake pedal 10. A wake-up signal may be generated when stepped on.

The movement information means information on the movement of the hydraulic piston 114, and may include position information of the hydraulic piston 114 and information related to whether the hydraulic piston 114 has moved to a preset position. Such movement information may be generated by the controller 320 when a system start-off command is received, and a detailed description thereof will be described later.

The controller 320 may control the driving unit 311 to move the hydraulic piston 114 to the first position when a system off command is received.

At this time, the system off command may mean a starting turn-off command for the electronic brake system 1, and the first position X1 is a position where the position of the hydraulic piston 114 contacts the rear wall of the cylinder block 111 Can mean That is, it may mean a position where the rear end of the hydraulic piston 114 contacts the rear end in the opening direction of the cylinder block 111. Further, the first position may be a position in which the hydraulic piston 114 has a minimum volume of the second pressure chamber 113 or a position in which the first pressure chamber 112 has a maximum volume.

Specifically, when the system off command is received, the control unit 320 transmits a control command for moving the hydraulic piston 114 to the first position to the driving unit 311 so that the hydraulic piston 114 is first It is possible to control the drive unit 311 to move to the position.

In the system shutdown step of the electronic brake system 1 according to an embodiment, the system off may be completed after a predetermined time after the system off command is received, and the controller 320 is the system off command After this is received, the driving unit 311 may be controlled so that the hydraulic piston 114 moves to the first position at a first time point before completion of the system off. In this case, the first point in time may mean a point in time when a control command for moving the hydraulic piston 114 to the first position is transmitted to the driving unit 311.

In addition, the controller 320 may identify whether the hydraulic piston 114 has finished moving to the first position.

Specifically, the control unit 320 may identify whether the hydraulic piston 114 has finished moving to the first position after receiving the system off command, and after receiving the system off command, the system It can be identified whether or not the hydraulic piston 114 has finished moving to the first position at a second point in time before completion of the off.

In this case, the second point may be a point after the first point of time when a control command for moving the hydraulic piston 114 to the first position is transmitted to the driving unit 311, and a predetermined time before the completion of the system off May be the point of view.

The control unit 320 may generate the identification result of whether the hydraulic piston 114 has completed movement to the first position and the position information of the hydraulic piston 114 as movement information, and a storage unit to store such movement information You can control 330.

On the other hand, the control unit 320 uses a memory (not shown) for storing data on an algorithm for controlling the operation of the components in the electronic brake system 1 or a program that reproduces the algorithm, and It may be implemented with a processor (not shown) that performs one operation. In this case, the memory and the processor may be implemented as separate chips, respectively. Alternatively, the memory and processor may be implemented as a single chip.

The storage unit 330 may store various information about the electronic brake system 1. Specifically, the storage unit 330 may store movement information related to the movement of the hydraulic piston 114. In this case, the movement information may include location information of the hydraulic piston 114 and information related to whether the hydraulic piston 114 has moved to a preset first position.

The storage unit 330 is a nonvolatile memory device or RAM such as a cache, a read only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), and a flash memory. It may be implemented as at least one of a volatile memory device such as (Random Access Memory) or a storage medium such as a hard disk drive (HDD) or a CD-ROM, but is not limited thereto. The storage unit may be a memory implemented as a separate chip from the processor described above with respect to the control unit, or may be implemented as a processor and a single chip.

At least one component may be added or deleted corresponding to the performance of the components of the electronic brake system 1 shown in FIG. 2. In addition, it will be readily understood by those of ordinary skill in the art that the mutual positions of the components may be changed corresponding to the performance or structure of the system.

Meanwhile, each component shown in FIG. 2 refers to software and/or hardware components such as a Field Programmable Gate Array (FPGA) and an Application Specific Integrated Circuit (ASIC).

Hereinafter, the operation of the control unit 320 will be described in detail with reference to FIG. 3.

3 is an enlarged view showing a hydraulic pressure providing unit according to an embodiment.

Referring to FIG. 3, the hydraulic pressure providing unit 110 according to an embodiment includes a cylinder block 111 in which a pressure chamber for receiving and storing oil is formed, a hydraulic piston 114 accommodated in the cylinder block 111, and , Sealing members 115 (115a, 115b) provided between the hydraulic piston 114 and the cylinder block 111 to seal the pressure chamber, and connected to the rear end of the hydraulic piston 114 to be output from the power conversion unit 130 It includes a drive shaft 133 for transmitting power to the hydraulic piston (114).

When the system off command is received, the control unit 320 may control the driving unit 311 so that the hydraulic piston 114 moves to the first position X1, and the hydraulic piston 114 is the first position X1. It is possible to identify whether the move to is completed.

At this time, the system off command may mean a starting turn-off command for the electronic brake system 1, and the first position X1 is a position where the position of the hydraulic piston 114 contacts the rear wall of the cylinder block 111 Can mean That is, it may mean a position where the rear end of the hydraulic piston 114 contacts the rear end in the opening direction of the cylinder block 111. Further, the first position may be a position in which the hydraulic piston 114 has a minimum volume of the second pressure chamber 113 or a position in which the first pressure chamber 112 has a maximum volume.

Specifically, when the system off command is received, the control unit 320 transmits a control command for moving the hydraulic piston 114 to the first position X1 to the driving unit 311, thereby the hydraulic piston 114 The drive unit 311 may be controlled to move to this first position X1.

The controller 320 may control the driving unit 311 so that the hydraulic piston 114 moves to the first position X1 at a first point in time before the system off is completed after the system off command is received. . In this case, the first point in time may mean a point in time when a control command for moving the hydraulic piston 114 to the first position X1 is transmitted to the driving unit 311.

In addition, the control unit 320 may identify whether the hydraulic piston 114 has finished moving to the first position X1.

Specifically, the control unit 320 may identify whether the hydraulic piston 114 has completed the movement to the first position X1 after receiving the system OFF command, and the system OFF command is received. It can be identified whether or not the hydraulic piston 114 has completed the movement to the first position X1 at a second point in time before the system is turned off after being completed.

At this time, the second point may be a point after the first point of time when a control command for moving the hydraulic piston 114 to the first position X1 is transmitted to the driving unit 311, It may be a point in time before a predetermined time.

In this case, depending on the position of the hydraulic piston 114 at the first time point, the hydraulic piston 114 may not be the first position X1 at the second time point.

Accordingly, the control unit 320 may generate an identification result of whether the hydraulic piston 114 has finished moving to the first position X1 and position information of the hydraulic piston 114 as movement information. At this time, the position information of the hydraulic piston 114 is the time when the controller 320 identifies whether the hydraulic piston 114 has completed the movement to the first position X1, the hydraulic piston 114 detected at the second time point. ) May mean location information.

When the hydraulic piston 114 has finished moving to the first position X1 at the second point in time, the controller 320 may generate a completion flag as an identification result.

Specifically, the control unit 320 detects the first position (X1) of the hydraulic piston 114 from the position sensor 312 when the position of the hydraulic piston 114 at the second time point is the first position (X1). When receiving, it is possible to generate a completion flag (flag) as an identification result.

In addition, when the hydraulic piston 114 does not complete the movement to the first position X1 at the second time point, that is, the position of the hydraulic piston 114 at the second time point is the first position X1. ), an incomplete flag may be generated as an identification result.

Specifically, the control unit 320 detects the first position (X1) of the hydraulic piston 114 from the position sensor 312 or when the position of the hydraulic piston 114 at the second point is not the first position (X1) When a signal is not received, an incomplete flag may be generated as a result of identification.

The movement information generated by the control unit 320 may be stored in the storage unit 330, and may be used as a control basis when the system driving signal is generated again and the initialization step is performed after the system is turned off. .

When the system driving (ON) signal is received, the control unit 320 may determine a position to move the hydraulic piston 114 based on the movement information, and the driving unit 311 may move the hydraulic piston 114 to the determined position. Can be controlled.

Specifically, when the system driving (ON) signal is received, the controller 320 determines whether to move the hydraulic piston 114 to one of the first position (X1) and the second position (X2) based on the movement information. I can.

At this time, the second position (X2) refers to the initial position of the hydraulic piston 114 that is set in advance in order for the electronic brake system 1 to generate the braking force, and can be determined from the first position (X1) to a predetermined position. have. For example, the second position X2 may mean a position having a distance of a predetermined range in the advance direction of the hydraulic piston 114 from the first position X1.

To this end, when the system driving signal is received, the controller 320 may check whether the hydraulic piston 114 has completed the movement to the first position X1 based on an identification result among movement information. In this case, the movement information may refer to movement information generated in a system termination step before the system performs an initialization step by receiving a system driving signal.

Specifically, the controller 320 may check whether the identification result of the stored movement information is a complete flag or an incomplete flag.

When the identification result is the completion flag, the control unit 320 can confirm that the hydraulic piston 114 has completed the movement to the first position X1, and the position to move the hydraulic piston 114 to the second position (X2) ) Can be determined. That is, the control unit 320 may omit the step of moving the position of the hydraulic piston 114 to the first position X1.

In this case, the step of moving the position of the hydraulic piston 114 to the first position X1 is omitted, and the position of the hydraulic piston 114 may be immediately determined as the second position X2. Therefore, when the hydraulic piston 114 exists in the third position (X3) and the hydraulic piston 114 is moved to the first position (X1) and then moved to the second position (X2) again, the initialization step is performed. Time can be shortened. Therefore, faster initialization setting can be performed. In addition, since the time delay occurring in providing the braking function to the user can be shortened, user convenience can be increased.

When the identification result is an incomplete flag, the control unit 320 may confirm that the hydraulic piston 114 has not completed the movement to the first position X1, and the position at which the hydraulic piston 114 is to be moved is determined to be the first position ( It can be determined by X1).

In this case, since it is confirmed that the position of the hydraulic piston 114 is not the first position X1, the control unit 320 cannot move the hydraulic piston 114 directly to the second position X2, and the first position After moving to (X1), it can be moved to the second position (X2).

However, even if it is confirmed that the hydraulic piston 114 has not completed the movement to the first position (X1), since the movement of the hydraulic piston 114 to the first position (X1) is performed at the previous system termination stage, initialization The execution time of the step may be shorter than when the movement of the hydraulic piston 114 to the first position X1 is not performed in the previous system termination step. Therefore, faster initialization setting can be performed. In addition, since the time delay occurring in providing the braking function to the user can be shortened, user convenience can be increased.

In addition, when it is confirmed that the hydraulic piston 114 has finished moving to the first position X1, the control unit 320 may check whether the position information is included in a predetermined range.

In this case, the location information may mean location information of the hydraulic piston 114 at the second point in time, and the predetermined range may be an error range with respect to a location having a predetermined distance from the first location X1. For example, the predetermined range may be a range from the first position X1 to a position having a distance of a predetermined range in the advance direction of the hydraulic piston 114.

When the position information of the hydraulic piston 114 is included in a predetermined range, the position of the hydraulic piston 114 is within an error range, so the controller 320 moves the hydraulic piston 114 to the second position ( X2) can be determined. That is, the control unit 320 may omit the step of moving the position of the hydraulic piston 114 to the first position X1.

In this case, the step of moving the position of the hydraulic piston 114 to the first position X1 is omitted, and the position of the hydraulic piston 114 may be immediately determined as the second position X2. Therefore, when the hydraulic piston 114 exists in the third position (X3) and the hydraulic piston 114 is moved to the first position (X1) and then moved to the second position (X2) again, the initialization step is performed. Time can be shortened. Therefore, faster initialization setting can be performed. In addition, since the time delay that occurs in providing the braking function to the user can be shortened, the user's convenience can be increased.

When the position information of the hydraulic piston 114 is not included in the predetermined range, the position of the hydraulic piston 114 is outside the error range, so the controller 320 sets the position to move the hydraulic piston 114 to the first position. It can be determined by (X1).

In this case, the controller 320 may not directly move the hydraulic piston 114 to the second position X2, but may move the hydraulic piston 114 to the first position X1 and then to the second position X2.

However, even if it is confirmed that the hydraulic piston 114 has not completed the movement to the first position (X1), since the movement of the hydraulic piston 114 to the first position (X1) is performed at the previous system termination stage, initialization The execution time of the step may be shorter than when the movement of the hydraulic piston 114 to the first position X1 is not performed in the previous system termination step. Therefore, faster initialization setting can be performed. In addition, since the time delay that occurs in providing the braking function to the user can be shortened, the user's convenience can be increased.

4 is a flowchart illustrating a method of controlling an electronic brake system according to an exemplary embodiment.

Referring to FIG. 4, the electronic brake system 1 according to an exemplary embodiment may check whether a system off command is received (401 ). In this case, the system off command may mean a start-up turn-off command for the electronic brake system 1.

When a system off command is received (YES in 401), the electronic brake system 1 may transmit a control command for moving the hydraulic piston 114 to the first position (402). In this case, the first position may mean a position where the position of the hydraulic piston 114 is in contact with the rear wall of the cylinder block 111. That is, it may mean a position where the rear end of the hydraulic piston 114 contacts the rear end in the opening direction of the cylinder block 111. Further, the first position may be a position in which the hydraulic piston 114 has a minimum volume of the second pressure chamber 113 or a position in which the first pressure chamber 112 has a maximum volume.

Thereafter, the electronic brake system 1 may identify whether the hydraulic piston 114 has moved to the first position X1 (403).

The electronic brake system 1 may generate movement information based on the identification result, and may store the generated movement information (404).

In this case, the movement information refers to information on the movement of the hydraulic piston 114, and may include position information of the hydraulic piston 114 and information related to whether the hydraulic piston 114 has moved to the first position. . In particular, the position information of the hydraulic piston 114 is the hydraulic piston 114 sensed at the time when it is identified whether the hydraulic piston 114 has finished moving to the first position X1, that is, when step 403 is performed. ) May mean location information.

Then, the electronic brake system 1 may terminate the system (405). That is, the system can be turned off.

Through this, since the movement of the hydraulic piston 114 to the first position is performed at the end of the system, the execution time of the subsequent system initialization step can be shortened.

That is, the execution time of the initializing step of the system may be shorter than when the movement of the hydraulic piston 114 to the first position is not performed in the previous system termination step. Therefore, faster initialization setting can be performed. In addition, since the time delay occurring in providing the braking function to the user can be shortened, user convenience can be increased.

5 is a flowchart illustrating a method of controlling an electronic brake system according to an exemplary embodiment.

Referring to FIG. 5, the electronic brake system 1 according to an embodiment may check whether a system initialization signal is received (501 ). In this case, the system initialization signal may mean a system driving (ON) signal, that is, an initialization command signal for the electronic brake system 1. The system drive signal may include a start-up signal or a wake-up signal of the electronic brake system 1. For example, when the electronic brake system 1 is implemented in a vehicle, not only when the vehicle is turned on, but also when the door is opened before the vehicle is turned on, or when the user presses the brake pedal 10, wake-up A signal can be generated.

When the system initialization signal is received (501), the electronic brake system 1 may check whether the hydraulic piston 114 has moved to the first position (502).

Specifically, the electronic brake system 1 may check whether the hydraulic piston 114 has completed the movement to the first position based on the identification result among movement information. In this case, the movement information may refer to movement information generated in a system termination step before the system performs an initialization step by receiving a system driving signal, that is, movement information generated in step 404 of FIG. 4.

The electronic brake system 1 may check whether the identification result of the stored movement information is a completed flag or an incomplete flag. When the identification result is the completion flag, the electronic brake system 1 can confirm that the hydraulic piston 114 has completed the movement to the first position. When the identification result is an incomplete flag, the electronic brake system 1 can confirm that the hydraulic piston 114 has not completed the movement to the first position.

When it is confirmed that the hydraulic piston 114 has moved to the first position (YES in 502), the electronic brake system 1 may check whether the position information is within a predetermined range (503).

At this time, the location information may mean the location information of the hydraulic piston 114 at the time when it is identified whether the location of the hydraulic piston 114 is the first location, that is, when step 403 of FIG. 4 is performed. have. Further, the predetermined range may be an error range with respect to a position having a predetermined distance from the first position. For example, the predetermined range may be a range from the first position to a position having a distance of 0.05 mm in the advance direction of the hydraulic piston 114.

When the position information of the hydraulic piston 114 is included in the predetermined range (example of 503), the position of the hydraulic piston 114 is within the error range, so the electronic brake system 1 moves the hydraulic piston 114 The position to be made can be determined as the second position. Thereafter, the electronic brake system 1 may move the hydraulic piston 114 to the second position (504), and the system initialization step for providing the braking function may be terminated.

That is, the electronic brake system 1 may omit the step of moving the position of the hydraulic piston 114 to the first position X1. In this case, in the electronic brake system 1, the step of moving the position of the hydraulic piston 114 to the first position is omitted, and the position of the hydraulic piston 114 may be immediately determined as the second position. Therefore, the execution time of the initializing step may be shorter than when the hydraulic piston 114 is moved to the first position and then to the second position since the hydraulic piston 114 is present at the position having the maximum stroke value. .

Therefore, faster initialization setting can be performed. At the same time, it is possible to shorten the time delay that occurs in providing the braking function to the user, so that the user's convenience can be increased.

As another example, when it is confirmed that the hydraulic piston 114 has not completed the movement to the first position (No in 502) or when the location information of the hydraulic piston 114 is not included in a predetermined range (No in 503) , The electronic brake system 1 may move the hydraulic piston 114 to the first position (505), and then move the hydraulic piston 114 to the second position (504).

In this case, since it is determined that the hydraulic piston 114 has not completed movement to the first position, the electronic brake system 1 cannot directly move the hydraulic piston 114 to the second position, and After moving to, it can be moved to the second position.

However, even if it is confirmed that the hydraulic piston 114 has not completed the movement to the first position, since the movement of the hydraulic piston 114 to the first position is performed in the previous system termination step, the execution time of the initialization step is reduced. The movement of the hydraulic piston to the first position may be shorter than if not performed in the previous system shutdown stage. Therefore, faster initialization setting can be performed. In addition, since the time delay occurring in providing the braking function to the user can be shortened, user convenience can be increased.

Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium storing instructions executable by a computer. The instruction may be stored in the form of a program code, and when executed by a processor, a program module may be generated to perform the operation of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

Computer-readable recording media include all kinds of recording media in which instructions that can be read by a computer are stored. For example, there may be read only memory (ROM), random access memory (RAM), magnetic tape, magnetic disk, flash memory, optical data storage device, and the like.

As described above, the disclosed embodiments have been described with reference to the accompanying drawings. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be practiced in a form different from the disclosed embodiments without changing the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

1: electronic brake system
110: hydraulic pressure providing unit
310: brake device
311: drive unit
312: position sensor
320: control unit
330: storage unit

Claims (17)

A hydraulic pressure providing unit including a piston provided to be able to move forward or backward;
A drive unit for moving the piston;
A storage unit for storing movement information regarding the movement of the piston; And
When a system driving (ON) signal is received, an electronic brake system including; a control unit determining a position to move the piston based on pre-stored movement information and controlling the driving unit to move the piston to the determined position; . The method of claim 1,
Further comprising a; a position sensor for sensing the position information of the piston,
The control unit,
When a system OFF command is received, the driving unit is controlled to move the piston to the first position, and it is identified whether the piston has finished moving to the first position, and the identification result and the position information An electronic brake system for generating movement information comprising a and controlling the storage to store the generated movement information. The method of claim 2,
The control unit,
An electronic brake system for identifying whether the piston has completed moving to the first position at a first time point after a predetermined time after receiving the system off command. The method of claim 3,
The control unit,
The electronic brake system for controlling the storage unit to store movement information including the identification result and position information of the piston at the first time point. The method of claim 2,
The control unit,
When the system driving signal is received, it is checked whether the piston has completed moving to the first position based on the identification result, and when it is confirmed that the piston has completed moving to the first position, the piston is An electronic brake system that determines the position to be moved as the second position. The method of claim 2,
The control unit,
When the system driving signal is received, it is checked whether the piston has completed moving to the first position based on the identification result, and if it is confirmed that the piston has not completed moving to the first position, the piston An electronic brake system for determining a position to move the motor as the first position. The method of claim 5,
The control unit,
When it is confirmed that the piston has finished moving to the first position, it is checked whether the position information is included in a predetermined range, and when the position information is included in a predetermined range, a position to move the piston is determined Electronic brake system with two positions. The method of claim 7,
The control unit,
If the position information is not included in the predetermined range, the electronic brake system for determining a position to move the piston as a first position. The method of claim 3,
The first time point is an electronic brake system that is a time before a predetermined time from the time when the system is completed. When a system OFF command is received, controlling the drive unit to move the piston to a first position;
Identify whether the piston has finished moving to the first position;
Generating movement information including the identification result and the location information, and storing the generated movement information;
When a system drive (ON) signal is received, determining a position to move the piston based on the movement information; And
Controlling the electronic brake system comprising; moving the piston to the determined position. The method of claim 10,
Identifying whether the piston has finished moving to the first position,
And identifying whether the piston has finished moving to the first position at a first point in time after a predetermined time after receiving the system off command. The method of claim 11,
Storing the generated movement information,
And storing movement information including the identification result and position information of the piston at the first point in time. The method of claim 10,
Determining the position to move the piston,
If the system drive signal is received, it is checked whether the piston has completed moving to the first position based on the identification result; And
When it is confirmed that the piston has finished moving to the first position, determining a position to move the piston to a second position. The method of claim 10,
Determining the position to move the piston,
If the system drive signal is received, it is checked whether the piston has completed moving to the first position based on the identification result; And
When it is confirmed that the piston has not completed the movement to the first position, determining a position to move the piston to the first position; and control method of an electronic brake system comprising a. The method of claim 13,
Determining the position to move the piston,
If it is confirmed that the piston has finished moving to the first position, it is checked whether the position information is included in a predetermined range; And
If the position information is included in the predetermined range, determining a position to move the piston as a second position; Control method of an electronic brake system comprising a. The method of claim 15,
Determining the position to move the piston,
If the position information is not included in the predetermined range, determining a position to move the piston as a first position; Control method of an electronic brake system comprising a. The method of claim 11,
The first point in time is a point in time before a predetermined time from a point in time when the system is turned off (OFF).

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