Electronic braking system and method of operating the same

Abstract

Disclosed are an electronic brake system and an operating method thereof. According to the electronic brake system of the present embodiment, the electronic brake system includes a reservoir storing a pressurized medium, an integrated master cylinder including a master piston, a master chamber having a volume that changes according to displacement of the master piston, and a sealing member sealing the master chamber, a simulator valve controlling flow of the pressurized medium between the reservoir and the master chamber, a hydraulic supply device operating a hydraulic piston to generate hydraulic pressure according to an electrical signal output in response to displacement of a brake pedal, and a hydraulic control unit disposed between the hydraulic supply device and a plurality of wheel cylinders, and leakage of components including the integrated master cylinder can be determined through an inspection flow path connected to the master chamber and an inspection valve provided in the inspection flow path.

Description

Technical Field

[0001] This invention relates to an electronic braking system and its operating method, and more specifically, to an electronic braking system and its operating method that generates braking force using an electrical signal corresponding to the displacement of the brake pedal. Background Technology

[0002] A braking system must be installed on a vehicle to perform braking, and various types of braking systems have been proposed for the safety of the driver and passengers.

[0003] Traditional braking systems primarily rely on a mechanically connected booster to supply the necessary hydraulic pressure to the wheel cylinders when the driver depresses the brake pedal. However, with increasing market demands for precise responses to vehicle operating environments to achieve multiple braking functions, an electronic braking system has recently become widely adopted. This system receives the driver's braking intention via an electrical signal from a pedal displacement sensor that senses the brake pedal's displacement, and then operates the hydraulic supply device based on the received electrical signal to supply the required hydraulic pressure to the wheel cylinders.

[0004] This electronic braking system generates and provides electrical signals based on the driver's brake pedal operation in normal operating mode or the braking judgment during automatic vehicle operation. It then electrically operates and controls the hydraulic supply device to generate the necessary hydraulic pressure for braking and transmit it to the wheel cylinders. As described above, this electronic braking system and its operating method are electrically operated and controlled. While it can achieve complex and diverse braking effects, technical problems in the electronic components can prevent the stable generation of the necessary hydraulic pressure for braking, posing a risk to passenger safety.

[0005] Therefore, a mechanism is needed whereby the electronic braking system enters an abnormal operating mode when a component malfunctions or loses control. In this mode, the driver's brake pedal operation is directly linked to the wheel cylinders. That is, in the abnormal operating mode of the electronic braking system, when the driver applies force to the brake pedal, the hydraulic pressure required for braking must be immediately generated and directly transmitted to the wheel cylinders. Furthermore, to ensure passenger safety by quickly entering the abnormal operating mode in emergencies, a solution is needed that can accurately and rapidly check for malfunctions in the electronic braking system. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] This embodiment aims to provide an electronic braking system and its operation method that can effectively achieve braking under various operating conditions.

[0008] This embodiment aims to provide an electronic braking system and its operation method that can quickly determine whether a malfunction has occurred through a simple structure and operation.

[0009] This embodiment aims to provide an electronic braking system and its operation method that improve braking performance and operational reliability.

[0010] This embodiment aims to provide an electronic braking system and its operation method that improve product durability by reducing the load applied to components.

[0011] This embodiment aims to provide an electronic braking system and its operation method that can reduce product manufacturing costs while improving product assemblability and manufacturability.

[0012] (II) Technical Solution

[0013] According to one aspect of the present invention, an electronic braking system can be provided, comprising: a reservoir for storing a pressurized medium; an integrated master cylinder including: a master piston connected to a brake pedal; a master chamber whose volume changes according to the displacement of the master piston; and a sealing member for sealing the master chamber; a simulator valve for controlling the flow of the pressurized medium between the reservoir and the master chamber; a hydraulic supply device for operating a hydraulic piston to generate hydraulic pressure according to an electrical signal output in response to the displacement of the brake pedal; a hydraulic control unit disposed between the hydraulic supply device and a plurality of wheel cylinders for controlling the flow of the pressurized medium supplied to the plurality of wheel cylinders; a release control unit disposed between the reservoir and the hydraulic supply device for controlling the flow of the pressurized medium; a backup flow path connecting the master chamber and the hydraulic control unit; a shut-off valve disposed in the backup flow path for controlling the flow of the pressurized medium; a first pressure sensor for sensing the hydraulic pressure supplied by the hydraulic supply device; a second pressure sensor for sensing the hydraulic pressure in the master chamber; a check flow path connecting the master chamber and the release control unit; and a check valve disposed in the check flow path for controlling the flow of the pressurized medium.

[0014] The master piston may include: a first master piston connected to the brake pedal; and a second master piston configured to be displaceable according to the displacement of the first master piston. The master chamber may include: a first master chamber whose volume changes according to the displacement of the first master piston; and a second master chamber whose volume changes according to the displacement of the second master piston. The integrated master cylinder may further include: a pedal simulator disposed between the first master piston and the second master piston and made of a compressible and expandable elastic material. A second pressure sensor can sense the hydraulic pressure in the second master chamber.

[0015] One end of the inspection flow path is connected to the release control unit, and the other end branches into a first branch flow path and a second branch flow path, which are respectively connected to the first main chamber. The inspection valve is disposed at one end of the inspection flow path. The electronic braking system may further include: a first inspection check valve disposed in the first branch flow path, which only allows the flow of pressurized medium from the release control unit to the first main chamber; and a second inspection check valve disposed in the second branch flow path, which only allows the flow of pressurized medium from the first main chamber to the release control unit.

[0016] The hydraulic supply device may include: a first pressure chamber disposed in front of the hydraulic piston; and a second pressure chamber disposed behind the hydraulic piston. The release control unit may include: a first release control unit that controls the flow of the pressurized medium between the first pressure chamber and the reservoir; and a second release control unit that controls the flow of the pressurized medium between the second pressure chamber and the reservoir. One end of the inspection flow path may be connected to the second release control unit.

[0017] It may further include: a first reservoir flow path connecting the reservoir and the first main chamber, and the simulator valve may be located in the first reservoir flow path.

[0018] The hydraulic control unit may include: a first hydraulic circuit for controlling the flow of pressurized medium supplied to the first and second wheel cylinders; and a second hydraulic circuit for controlling the flow of pressurized medium supplied to the third and fourth wheel cylinders. The backup flow path may include: a first backup flow path connecting the first main chamber and the first hydraulic circuit; and a second backup flow path connecting the second main chamber and the second hydraulic circuit. The shut-off valve may include: a first shut-off valve disposed in the first backup flow path to control the flow of pressurized medium; and a second shut-off valve disposed in the second main chamber to control the flow of pressurized medium.

[0019] The integrated master cylinder may further include: a first sealing component for sealing the first main chamber to the outside; a second sealing component for sealing the first main chamber to the second main chamber; and a third sealing component for blocking the flow of pressurized medium from the first branch flow path into the first main chamber.

[0020] It may further include: a second reservoir flow path connecting the reservoir and the second main chamber; the integrated master cylinder may further include: a fourth sealing component blocking the flow of pressurized medium discharged from the second main chamber to the second reservoir flow path.

[0021] The first sealing component may be disposed on the rear side of the third sealing component, and the second branch flow path may be connected between the first sealing component and the third sealing component in the integrated master cylinder.

[0022] The first main piston may include a first shut-off orifice, which connects the first main chamber and the second branch flow path in a non-operating state. The second main piston may include a second shut-off orifice, which connects the second main chamber and the second reservoir flow path in a non-operating state.

[0023] An electronic braking system may be provided, comprising: a reservoir for storing a pressurized medium; an integrated master cylinder including: a master piston connected to a brake pedal; a master chamber whose volume changes according to the displacement of the master piston; and a sealing component for sealing the master chamber; a simulator valve for controlling the flow of the pressurized medium between the reservoir and the master chamber; a hydraulic supply device for operating a hydraulic piston to generate hydraulic pressure according to an electrical signal output in response to the displacement of the brake pedal; a hydraulic control unit disposed between the hydraulic supply device and a plurality of wheel cylinders for controlling the flow of the pressurized medium supplied to the plurality of wheel cylinders; and a backup. The system includes: a flow path connecting the main chamber and the hydraulic control unit; a shut-off valve disposed in the backup flow path to control the flow of the pressurized medium; a first pressure sensor to sense the hydraulic pressure supplied by the hydraulic supply device; a second pressure sensor to sense the hydraulic pressure in the main chamber; a check flow path connecting the reservoir and the main chamber; and a check valve disposed in the check flow path to control the flow of the pressurized medium. The main piston may include: a shut-off orifice that connects the main chamber and the check flow path in a non-operating state, and blocks the main chamber and the check flow path when the main piston is displaced.

[0024] The master piston may include: a first master piston connected to the brake pedal; and a second master piston configured to be displaceable according to the displacement of the first master piston. The master chamber may include: a first master chamber whose volume changes according to the displacement of the first master piston; and a second master chamber whose volume changes according to the displacement of the second master piston. The integrated master cylinder may further include: a pedal simulator disposed between the first master piston and the second master piston and made of a compressible and expandable elastic material. The first master piston may include: a first shut-off orifice connecting the first master chamber and the inspection flow path in a non-operating state, and a second pressure sensor capable of sensing the hydraulic pressure in the second master chamber.

[0025] One end of the inspection flow path can be connected to the reservoir side, and the other end can be connected to the first main chamber.

[0026] It may further include: a first reservoir flow path connecting the reservoir and the first main chamber, and the simulator valve may be located in the first reservoir flow path.

[0027] The hydraulic control unit may include: a first hydraulic circuit for controlling the flow of pressurized medium supplied to the first and second wheel cylinders; and a second hydraulic circuit for controlling the flow of pressurized medium supplied to the third and fourth wheel cylinders. The backup flow path may include: a first backup flow path connecting the first main chamber and the first hydraulic circuit; and a second backup flow path connecting the second main chamber and the second hydraulic circuit. The shut-off valve may include: a first shut-off valve disposed in the first backup flow path to control the flow of pressurized medium; and a second shut-off valve disposed in the second main chamber to control the flow of pressurized medium.

[0028] It may further include: an auxiliary inspection flow path connecting the reservoir and the first main chamber; the integrated master cylinder may further include: a first sealing component for sealing the first main chamber to the outside; a second sealing component for sealing the first main chamber to the second main chamber; and a third sealing component for blocking the flow of pressurized medium from the first main chamber into the auxiliary inspection flow path.

[0029] It may further include: a second reservoir flow path connecting the reservoir and the second main chamber; the integrated master cylinder may further include: a fourth sealing component blocking the flow of pressurized medium discharged from the second main chamber to the second reservoir flow path.

[0030] The first sealing component may be disposed on the rear side of the third sealing component, and the inspection flow path may be connected between the first sealing component and the third sealing component in the integrated master cylinder.

[0031] The operation method of the electronic braking system may include: a first check mode and a second check mode, checking whether the integrated master cylinder or simulator valve is leaking. In the first check mode, the hydraulic piston is moved forward so that the hydraulic pressure formed in the first pressure chamber is supplied to the first master chamber in sequence through the hydraulic control unit, the hydraulic circuit and the backup flow path. The electronic control unit can compare the hydraulic pressure value sensed by the first pressure sensor and the hydraulic pressure value sensed by the second pressure sensor to determine whether there is a leak.

[0032] In the second inspection mode, the second release control unit blocks the second pressure chamber and the reservoir, and opens the inspection valve to connect the second pressure chamber and the inspection flow path, causing the hydraulic piston to move backward to form hydraulic pressure in the second pressure chamber. The electronic control unit can determine whether there is a leak based on the displacement of the hydraulic piston.

[0033] (III) Beneficial Effects

[0034] The electronic braking system and its operating method according to this embodiment can achieve stable and effective braking under various operating conditions of the vehicle.

[0035] The electronic braking system and its operation method according to this embodiment can quickly and accurately determine whether the device has malfunctioned through a simple structure and operation, thereby ensuring passenger safety.

[0036] The electronic braking system and its operation method according to this embodiment can improve braking performance and operational reliability.

[0037] The electronic braking system and its operating method according to this embodiment can stably provide braking pressure when a component fails or the pressurized medium leaks.

[0038] The electronic braking system and its operation method according to this embodiment reduce the load applied to the components, thereby improving product durability.

[0039] The electronic braking system and its operating method according to this embodiment can improve the assemblability and manufacturability of the product while reducing the product manufacturing cost. Attached Figure Description

[0040] Figure 1 This is a hydraulic circuit diagram illustrating an electronic braking system according to a first embodiment of the present invention.

[0041] Figure 2 It is shown in magnification Figure 1 The diagram shows the integrated master cylinder.

[0042] Figure 3 This is a hydraulic circuit diagram showing the state of the electronic braking system performing a check preparation mode according to a first embodiment of the present invention.

[0043] Figure 4 This is a hydraulic circuit diagram showing the state of the electronic braking system performing a first check mode according to a first embodiment of the present invention.

[0044] Figure 5 This is a hydraulic circuit diagram showing the state of the electronic braking system performing the second inspection mode according to a first embodiment of the present invention.

[0045] Figure 6 This is a hydraulic circuit diagram illustrating an electronic braking system according to a second embodiment of the present invention.

[0046] Figure 7 It is shown in magnification Figure 6 The diagram shows the integrated master cylinder.

[0047] Figure 8 This is a hydraulic circuit diagram showing the state of the electronic braking system performing the check preparation mode according to a second embodiment of the present invention.

[0048] Figure 9 This is a hydraulic circuit diagram showing the state of the electronic braking system performing a check mode according to a second embodiment of the present invention. Detailed Implementation

[0049] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. These embodiments are provided to fully convey the spirit of the invention to those skilled in the art. The invention is not limited to the embodiments given herein and may be embodied in other forms. To clarify the invention, figures of parts unrelated to the description will be omitted in the drawings, and the dimensions of components may be shown enlarged to aid understanding.

[0050] Figure 1 This is a hydraulic circuit diagram showing an electronic braking system 1000 according to a first embodiment of the present invention.

[0051] Reference Figure 1 The electronic braking system 1000 according to a first embodiment of the present invention includes: a reservoir 1100 for storing a pressurized medium; an integrated master cylinder 1200 for providing the driver with a reaction force based on the pedal force of the brake pedal 10, while simultaneously pressurizing and discharging the pressurized medium, such as brake fluid, contained within it; a hydraulic supply device 1300 for receiving the driver's braking intention via an electrical signal from a pedal displacement sensor for sensing the displacement of the brake pedal 10, and generating hydraulic pressure for the pressurized medium through mechanical operation; a hydraulic control unit 1400 for controlling the hydraulic pressure supplied from the hydraulic supply device 1300; and hydraulic circuits 1510 and 1520, each equipped with a wheel cylinder that receives the pressurized medium. The system includes hydraulic pressure for braking each wheel (RR, RL, FR, FL); a dump control unit 1800, located between the hydraulic supply unit 1300 and the reservoir 1100, for controlling the flow of the pressurized medium; backup flow paths 1610 and 1620, hydraulically connected to the integrated master cylinder 1200 and hydraulic circuits 1510 and 1520; a reservoir flow path, hydraulically connected to the reservoir 1100 and the integrated master cylinder 1200; a check flow path 1900, connected to the main chamber of the integrated master cylinder 1200; and an electronic control unit (ECU) (not shown), which controls the hydraulic supply unit 1300 and various valves based on hydraulic information and pedal displacement information.

[0052] The integrated master cylinder 1200 is configured to provide a reaction force to the driver when the driver applies pedal force to the brake pedal 10 to perform a braking operation, thereby providing a stable pedal feel, while pressurizing and discharging the pressurized medium contained inside according to the operation of the brake pedal 10.

[0053] Figure 2 It is shown in magnification Figure 1 The diagram of the integrated master cylinder 1200 is shown in the reference diagram. Figure 1 and Figure 2 In the integrated master cylinder 1200, the analog part that provides pedal feel to the driver and the master cylinder part that pressurizes and discharges the pressurized medium contained inside according to the pedal force of the brake pedal can be arranged coaxially in a cylinder body 1210.

[0054] Specifically, the integrated master cylinder 1200 may include: a cylinder body 1210 with a chamber formed on its inner side; a first main chamber 1220a formed on the inlet side of the cylinder body 1210 to which the brake pedal 10 is connected; a first master piston 1220 disposed in the first main chamber 1220a and configured to be connected to the brake pedal 10 so as to be displaceable according to the operation of the brake pedal 10; and a second main chamber 1230a formed on the inner or front side of the first main chamber 1220a in the cylinder body 1210 (to... Figure 1 (Left side as reference); a second main piston 1230, disposed in a second main chamber 1230a, and configured to be displaceable according to the displacement of the first main piston 1220 or the hydraulic pressure of the pressurized medium contained in the first main chamber 1220a; and a pedal simulator 1240, disposed between the first main piston 1220 and the second main piston 1230, and providing pedal feel by means of the elastic restoring force generated during compression.

[0055] The first main chamber 1220a and the second main chamber 1230a can be located in the cylinder body 1210 of the integrated master cylinder 1200 from the brake pedal 10 side (towards). Figure 1 (based on the right side) towards the inside (with) Figure 1 (Based on the left side) are formed sequentially. In addition, the first main piston 1220 and the second main piston 1230 are respectively disposed in the first main chamber 1220a and the second main chamber 1230a, so that hydraulic or negative pressure can be formed on the pressurized medium contained in each chamber by moving forward and backward.

[0056] The cylinder body 1210 may include: a large-diameter portion 1211, on which a first main chamber 1220a is formed, and the inner diameter is relatively large; and a small-diameter portion 1212, on which a second main chamber 1230a is formed, and the inner diameter is relatively smaller than that of the large-diameter portion 1211. The large-diameter portion 1211 and the small-diameter portion 1212 of the cylinder body 1210 may be integrally formed.

[0057] The first main chamber 1220a can be formed on the inlet side or rear side of the cylinder body 1210 (to...). Figure 1 The first master piston 1220, which is located inside the large-diameter portion 1211 (based on the right side) and is connected to the brake pedal 10 via the input rod 12, is reciprocally housed in the first main chamber 1220a.

[0058] In the first main chamber 1220a, pressurized medium can flow in and out through the first hydraulic port 1280a, the second hydraulic port 1280b, the third hydraulic port 1280c, and the fourth hydraulic port 1280d. The first hydraulic port 1280a can be connected to the first reservoir flow path 1710, described later, so that pressurized medium flows from the reservoir 1100 into the first main chamber 1220a, or pressurized medium contained in the first main chamber 1220a is discharged into the reservoir 1100. The second hydraulic port 1280b can be connected to the first backup flow path 1610, described later, so that pressurized medium is discharged from the first main chamber 1220a to the first backup flow path 1610 side, or conversely, pressurized medium flows from the first backup flow path 1610 into the first main chamber 1220a side.

[0059] Additionally, the first main chamber 1220a can be connected to the first branch flow path 1910 and the second branch flow path 1920 of the inspection flow path 1900, which will be described later, via the third hydraulic port 1280c and the fourth hydraulic port 1280d, respectively, so that the pressurized medium contained in the first main chamber 1220a is discharged to the inspection flow path 1900 side, or the pressurized medium flows from the inspection flow path 1900 into the first main chamber 1220a.

[0060] The first main piston 1220 is housed and disposed in the first main chamber 1220a, and can be moved forward (to... Figure 1 (Based on the left-hand direction) pressurize the pressurized medium contained in the first main chamber 1220a to form hydraulic pressure, or it can be achieved by moving backward (towards) Figure 1 (Based on the right-hand direction) a negative pressure is formed inside the first main chamber 1220a. The first main piston 1220 may include: a first body 1221, formed in a cylindrical shape to fit tightly against the inner circumferential surface of the first main chamber 1220a; and a first flange 1222, at the rear end of the first body 1221 (towards the right-hand direction) to form a negative pressure. Figure 1 The first master piston 1220 is formed radially extending from the right end of the first flange 1222 and connected to the input rod 12. The first master piston 1220 can be elastically supported by a first piston spring 1220b, and the first piston spring 1220b can be configured such that one end of it rests on the front surface of the first flange 1222 (to...). Figure 1 The left side surface is used as a reference, and the other end is supported on the outer surface of the cylinder 1210.

[0061] The first main piston 1220 is provided with a first cutoff hole 1220d, which communicates with the first main chamber 1220a and, in the non-operating state (i.e., the preparatory state before displacement), communicates with the fourth hydraulic port 1280d and the second branch flow path 1920. Additionally, a first sealing member 1290a can be provided between the outer peripheral surface of the first main piston 1220 and the cylinder body 1210 to seal the first main chamber 1220a from the outside. The first sealing member 1290a can be configured to be disposed in a receiving groove recessed into the inner peripheral surface of the cylinder body 1210 and in contact with the outer peripheral surface of the first main piston 1220. The first sealing member 1290a prevents the pressurized medium contained in the first main chamber 1220a from leaking to the outside while preventing external foreign matter from flowing into the first main chamber 1220a. The first sealing member 1290a can be located on the outermost side of the inner circumferential surface of the cylinder body 1210, that is, behind the fourth hydraulic port 1280d connected to the second branch flow path 1920, which will be described later. Figure 1 (Based on the right side).

[0062] A third sealing member 1290c may be provided between the outer peripheral surface of the first main piston 1220 and the cylinder body 1210. The third sealing member 1290c blocks the flow of pressurized medium into the first main chamber 1220a from the first branch flow path 1910 connected to the third hydraulic port 1280c. The third sealing member 1290c may be respectively disposed in a pair of receiving grooves respectively recessed in front of and behind the third hydraulic port 1280c formed on the inner peripheral surface of the cylinder body 1210 and in contact with the outer peripheral surface of the first main piston 1220. A pair of third sealing members 1290c may be disposed in front of the first sealing member 1290a (towards...). Figure 1 (Based on the left side), the pressurized medium contained in the first main chamber 1220a is allowed to flow through the third hydraulic port 1280c to the first branch flow path 1910, and the flow of pressurized medium from the first branch flow path 1910 into the first main chamber 1220a is blocked.

[0063] The second main chamber 1230a may be formed on the inner or front side of the cylinder body 1210 (i.e., ...). Figure 1 The small diameter portion 1212 (based on the left side) is located inside the second main piston 1230, and the second main piston 1230 is reciprocally accommodated in the second main chamber 1230a.

[0064] In the second main chamber 1230a, pressurized medium can flow in and out through the fifth hydraulic port 1280e and the sixth hydraulic port 1280f. The fifth hydraulic port 1280e can be connected to the second reservoir flow path 1720, described later, so that the pressurized medium contained in the reservoir 1100 flows into the second main chamber 1230a. Additionally, the sixth hydraulic port 1280f can be connected to the second backup flow path 1620, described later, so that the pressurized medium contained in the second main chamber 1230a is discharged to the second backup flow path 1620 side, and conversely, the pressurized medium can flow into the second main chamber 1230a side from the second backup flow path 1620.

[0065] The second main piston 1230 is housed and disposed within the second main chamber 1230a. It can generate hydraulic pressure by moving forward to fill the pressurized medium contained in the second main chamber 1230a, and can generate negative pressure by moving backward within the second main chamber 1230a. The second main piston 1230 may include: a second body 1231, formed in a cylindrical shape to fit tightly against the inner circumferential surface of the second main chamber 1230a; and a second flange 1232 at the rear end of the second body 1231 (towards...). Figure 1 The second flange 1232 is formed radially extending from the right end of the second main chamber 1230a and is disposed inside the first main chamber 1220a. The diameter of the second flange 1232 may be larger than the diameter of the inner circumferential surface of the second main chamber 1230a. The second main piston 1230 may be elastically supported by a second piston spring 1230b, and the second piston spring 1230b may be configured such that one end of it supports the front surface of the second body 1231 (to...). Figure 1 The left side surface is used as a reference, and the other end is supported on the inner surface of the cylinder 1210.

[0066] A second sealing member 1290b may be provided between the outer peripheral surface of the second main piston 1230 and the cylinder 1210, the second sealing member 1290b sealing the first main chamber 1220a against the second main chamber 1230a. The second sealing member 1290b may be configured to be disposed in a receiving groove recessed in the inner peripheral surface of the cylinder 1210 and in contact with the outer peripheral surface of the second main piston 1230, thereby preventing the pressurized medium contained in the first main chamber 1220a from leaking into the second main chamber 1230a.

[0067] The second main piston 1230 is provided with a second shut-off hole 1230d, which communicates with the second main chamber 1230a and, in the non-operating state (i.e., the preparatory state before displacement), communicates with the fifth hydraulic port 1280e and the second reservoir flow path 1720. Additionally, a fourth sealing member 1290d can be provided between the outer peripheral surface of the second main piston 1230 and the cylinder body 1210. This fourth sealing member 1290d blocks the flow of pressurized medium discharged from the second main chamber 1230a to the second reservoir flow path 1720 connected to the fifth hydraulic port 1280e. The fourth sealing member 1290d can be positioned in front of the fifth hydraulic port 1280e, which is recessed into the inner peripheral surface of the cylinder body 1210. Figure 1 The fourth sealing member 1290d is located in the receiving groove (on the left side of the reference) and contacts the outer peripheral surface of the second main piston 1230. The fourth sealing member 1290d can be disposed in front of the second sealing member 1290b (within the left side of the reference). Figure 1 (Based on the left side), it allows the flow of pressurized medium from the second reservoir flow path 1720 connected to the fifth hydraulic port 1280e to the second main chamber 1230a, and blocks the flow of pressurized medium from the second main chamber 1230a to the fifth hydraulic port 1280e and the second reservoir flow path 1720.

[0068] In the integrated master cylinder 1200, the first master chamber 1220a and the second master chamber 1230a are independently provided, thereby ensuring safety in the event of component failure. For example, the first master chamber 1220a can be connected to any two wheel cylinders 21 and 22 of the right front wheel (FR), left front wheel (FL), left rear wheel (RL), and right rear wheel (RR) via the first backup flow path 1610 described later, and the second master chamber 1230a can be connected to the other two wheel cylinders 23 and 24 via the second backup flow path 1620 described later. Therefore, even if a problem such as a leak occurs in any of the chambers, vehicle braking can still be achieved.

[0069] The pedal simulator 1240 is disposed between the first master piston 1220 and the second master piston 1230, and can provide the driver with the pedal feel of the brake pedal 10 through its own elastic restoring force. Specifically, the pedal simulator 1240 can be clamped between the front surface of the first master piston 1220 and the rear surface of the second master piston 1230, and can be made of an elastic material such as compressible and expandable rubber. The pedal simulator 1240 may include: a cylindrical body portion, at least a portion of which is inserted into and supported by the rear surface of the second master piston 1230; and a conical portion, at least a portion of which is inserted into and supported by the front surface of the first master piston 1220, and the diameter of the conical portion faces forward (towards...). Figure 1The left side (as a reference) gradually expands to form the pedal simulator 1240. At least a portion of each end of the pedal simulator 1240 is inserted into the first master piston 1220 and the second master piston 1230, respectively, so that it can be stably supported. Furthermore, the elastic restoring force can be changed by the cone according to the pedal force of the brake pedal 10, thereby providing the driver with a stable and familiar pedal feel.

[0070] The first reservoir flow path 1710, described later, is equipped with a simulator valve 1711 to control the flow of pressurized medium between the reservoir 1100 and the first main chamber 1220a. The simulator valve 1711 can be configured as a normally closed solenoid valve that operates to open when receiving an electrical signal from the electronic control unit, and the simulator valve 1711 can be opened in the normal operating mode of the electronic braking system 1000. Additionally, a bypass flow path 1730 can be provided on the first reservoir flow path 1710, with one end connected to the front side of the simulator valve 1711 and the other end connected to the rear side of the simulator valve 1711, and the bypass flow path 1730 can be equipped with a simulator check valve 1731. That is, the simulator check valve 1731 can be connected in parallel with the simulator valve 1711 to allow the flow of pressurized medium from the reservoir 1100 toward the first main chamber 1220a, and to block the flow of pressurized medium in the opposite direction.

[0071] The operation of the pedal simulator in the integrated master cylinder 1200 is described below. In normal operating mode, when the driver operates the brake pedal 10, the first shut-off valve 1611 and the second shut-off valve 1621, respectively located in the first backup flow path 1610 and the second backup flow path 1620 (described later), are closed, while the simulator valve 1711 in the first reservoir flow path 1710 is open. With the operation of the brake pedal 10, the first master piston 1220 moves forward, but due to the closing operation of the second shut-off valve 1621, the second main chamber 1230a is closed, thus preventing the second master piston 1230 from displacing. At this time, due to the closing operation of the first shut-off valve 1611 and the opening operation of the simulator valve 1711, the pressurized medium contained in the first main chamber 1220a flows in along the first reservoir flow path 1710. Since the second master piston 1230 cannot move forward, the first master piston 1220 continues to move forward and compresses the pedal simulator 1240, thus the elastic restoring force of the pedal simulator 1240 can be provided to the driver as a pedal feel. Subsequently, when the driver releases the pedal force of the brake pedal 10, the first master piston 1220, the second master piston 1230 and the pedal simulator 1240 can be restored to their original shape and position by the elastic restoring force of the first piston spring 1220b, the second piston spring 1230b and the pedal simulator 1240, and the first main chamber 1220a can receive and be filled with pressurized medium from the reservoir 1100 through the first reservoir flow path 1710.

[0072] As described above, since the interiors of the first main chamber 1220a and the second main chamber 1230a are always filled with pressurized medium, the friction between the first main piston 1220 and the second main piston 1230 is minimized during pedal simulator operation, thereby improving the durability of the integrated master cylinder 1200 and preventing foreign objects from flowing in from the outside.

[0073] The reservoir 1100 can internally contain and store pressurized medium. The reservoir 1100 can be connected to various components such as the integrated master cylinder 1200, the hydraulic supply device 1300 described later, and the hydraulic circuit described later, to supply or receive pressurized medium. Although multiple reservoirs 1100 are shown in the drawings with the same reference numerals, this is merely an example shown to aid in understanding the invention; the reservoir 1100 can be configured as a single component or as multiple independent components.

[0074] The reservoir flow path is configured to connect the integrated master cylinder 1200 and the reservoir 1100.

[0075] The reservoir flow path may include: a first reservoir flow path 1710, connecting the first main chamber 1220a and the reservoir 1100; and a second reservoir flow path 1720, connecting the second main chamber 1230a and the reservoir 1100. For this purpose, one end of the first reservoir flow path 1710 can be connected to the first main chamber 1220a via the first hydraulic port 1280a of the integrated master cylinder 1200, and the other end can be connected to the reservoir 1100. Similarly, one end of the second reservoir flow path 1720 can be connected to the second main chamber 1230a via the fifth hydraulic port 1280e of the integrated master cylinder 1200, and the other end can be connected to the reservoir 1100. Additionally, as described above, the first reservoir flow path 1710 is equipped with a simulator valve 1711 that opens in normal operating mode, thereby controlling the flow of pressurized medium through the first reservoir flow path 1710 between the reservoir 1100 and the first main chamber 1220a. Furthermore, a bypass flow path 1730 may be provided on the first reservoir flow path 1710, with one end connected to the front side of the simulator valve 1711 and the other end connected to the rear side of the simulator valve 1711. The bypass flow path 1730 may also be equipped with a simulator check valve 1731 that only allows the flow of pressurized medium from the reservoir 1100 to the first main chamber 1220a.

[0076] The hydraulic supply device 1300 is configured to receive the driver's braking intention by electrical signal from the pedal displacement sensor 11 for sensing the displacement of the brake pedal 10, and to generate hydraulic pressure of the pressurized medium by mechanical operation.

[0077] The hydraulic supply device 1300 may include: a hydraulic supply unit that provides pressure of the pressurized medium to the wheel cylinder; a motor (not shown) that generates rotational force according to the electrical signal of the pedal displacement sensor 11; and a power conversion unit (not shown) that converts the rotational motion of the motor into linear motion and transmits it to the hydraulic supply unit.

[0078] The hydraulic supply unit includes: a cylinder body 1310 configured to contain a pressurized medium; a hydraulic piston 1320 housed in the cylinder body 1310; a sealing member 1350 disposed between the hydraulic piston 1320 and the cylinder body 1310 to seal pressure chambers 1330 and 1340; and a drive shaft 1390 for transmitting power output from the power conversion unit to the hydraulic piston 1320.

[0079] Pressure chambers 1330 and 1340 may include: a first pressure chamber 1330, located in front of the hydraulic piston 1320 (towards...). Figure 1 (to the left of the reference hydraulic piston 1320); and a second pressure chamber 1340, located behind the hydraulic piston 1320 (to the left of the reference hydraulic piston 1320). Figure 1(Referring to the right side of the hydraulic piston 1320). That is, the first pressure chamber 1330 is separated by the cylinder body 1310 and the front surface of the hydraulic piston 1320, and the volume of the first pressure chamber 1330 changes according to the movement of the hydraulic piston 1320; the second pressure chamber 1340 is separated by the cylinder body 1310 and the rear surface of the hydraulic piston 1320, and the volume of the second pressure chamber 1340 changes according to the movement of the hydraulic piston 1320.

[0080] A motor (not shown) is configured to generate driving force for the hydraulic piston 1320 based on electrical signals output from an electronic control unit (ECU). The motor may include a stator and a rotor, thereby allowing it to rotate forward or backward to provide the power to displace the hydraulic piston 1320. The angular velocity and angle of rotation of the motor can be precisely controlled by a motor control sensor (not shown), which can control the operation of the motor and the hydraulic piston 1320 based on hydraulic values ​​sensed by a first pressure sensor PS1, described later. Motors are well-known technology, therefore a detailed description will be omitted.

[0081] A power conversion unit (not shown) is configured to convert the rotational force of the motor into linear motion. As an example, the power conversion unit may be configured to include a worm shaft (not shown), a worm wheel (not shown), and a drive shaft 1390. The worm shaft may be integrally formed with the rotating shaft of the motor, and a worm may be formed on its outer circumferential surface and mesh with the worm wheel to rotate the worm wheel. The worm wheel may mesh with the drive shaft 1390 to cause the drive shaft 1390 to move linearly, and the drive shaft 1390 is connected to a hydraulic piston 1320, whereby the hydraulic piston 1320 can slide within the cylinder 1310.

[0082] To further explain the above operation, when the pedal displacement sensor 11 senses the displacement of the brake pedal 10, the sensed signal is transmitted to the electronic control unit, which drives the motor to rotate the worm shaft in one direction. The rotational force of the worm shaft is transmitted to the drive shaft 1390 through the worm wheel, and the hydraulic piston 1320 connected to the drive shaft 1390 can move forward in the cylinder 1310 to generate hydraulic pressure in the first pressure chamber 1330.

[0083] Conversely, when the pedal force of the brake pedal 10 is released, the electronic control unit drives the motor to rotate the worm gear axis in the opposite direction. Therefore, the worm wheel also rotates in the opposite direction, and the hydraulic piston 1320 connected to the drive shaft 1390 can move rearward in the cylinder 1310 to generate negative pressure in the first pressure chamber 1330.

[0084] The generation of hydraulic and negative pressure in the second pressure chamber 1340 can be achieved by operating in the opposite direction to the aforementioned directions. That is, when the pedal force of the brake pedal 10 is released, the electronic control unit drives the motor to rotate the worm shaft in the opposite direction. The rotational force of the worm shaft is transmitted to the drive shaft 1390 via the worm wheel, and the hydraulic piston 1320 connected to the drive shaft 1390 can move backward in the cylinder 1310 to generate hydraulic pressure in the second pressure chamber 1340.

[0085] Conversely, when the pedal displacement sensor 11 senses the displacement of the brake pedal 10, the sensed signal is transmitted to the electronic control unit, which drives the motor in one direction to rotate the worm gear in that direction. Therefore, the worm gear also rotates in one direction, and the hydraulic piston 1320 connected to the drive shaft 1390 can move forward in the cylinder 1310 to generate negative pressure in the second pressure chamber 1340.

[0086] As described above, the hydraulic supply device 1300 can generate hydraulic or negative pressure in the first pressure chamber 1330 and the second pressure chamber 1340 respectively according to the rotation direction of the worm shaft driven by the motor, and can determine whether to achieve braking by transmitting hydraulic pressure or to release braking by using negative pressure through the control valve.

[0087] On the other hand, the power conversion unit according to the first embodiment of the present invention is not limited to any particular structure, as long as it can convert the rotational motion of the motor into the linear motion of the hydraulic piston 1320, and should be understood in the case of devices composed of various structures and methods.

[0088] The hydraulic supply device 1300 can be hydraulically connected to the reservoir 1100 via a release control unit 1800. The release control unit 1800 may include: a first release control unit 1810 for controlling the flow of pressurized medium between the first pressure chamber 1330 and the reservoir 1100; and a second release control unit 1820 for controlling the flow of pressurized medium between the second pressure chamber 1340 and the reservoir 1100. Both the first and second release control units 1810 and 1820 may include multiple flow paths and various solenoid valves to control the flow of pressurized medium between the hydraulic supply device 1300 and the reservoir 1100. The second release control unit 1820 may be connected to one end of the inspection flow path 1900, described later, to transfer pressurized medium flowing into the inspection flow path 1900 to the reservoir 1100, or to transfer pressurized medium discharging from the second pressure chamber 1340 to the inspection flow path 1900.

[0089] The hydraulic control unit 1400 can be configured to control the hydraulic pressure transmitted to each wheel cylinder, and the electronic control unit (ECU) is configured to control the hydraulic supply device 1300 and various valves based on hydraulic information and pedal displacement information.

[0090] The hydraulic control unit 1400 may be provided with a first hydraulic circuit 1510 and a second hydraulic circuit 1520. The first hydraulic circuit 1510 controls the flow of hydraulic pressure transmitted to the first wheel cylinder 21 and the second wheel cylinder 22 of the four wheel cylinders. The second hydraulic circuit 1520 controls the flow of hydraulic pressure transmitted to the third wheel cylinder 23 and the fourth wheel cylinder 24. The hydraulic control unit 1400 includes multiple flow paths and valves to control the hydraulic pressure transmitted from the hydraulic supply device 1300 to the wheel cylinders.

[0091] The hydraulic control unit 1400 can regulate and control the hydraulic pressure in the first pressure chamber 1330 formed by the forward movement of the hydraulic piston 1320 or the second pressure chamber 1340 formed by the backward movement of the hydraulic piston 1320, and supply it to the first hydraulic circuit 1510 and the second hydraulic circuit 1520. Additionally, the hydraulic control unit 1400 can recover the pressurized medium supplied to the first hydraulic circuit 1510 and the second hydraulic circuit 1520 by the negative pressure in the first pressure chamber 1330 formed by the backward movement of the hydraulic piston 1320 or the negative pressure in the second pressure chamber 1340 formed by the forward movement of the hydraulic piston 1320.

[0092] The first hydraulic circuit 1510 can control the hydraulic pressure applied to the first wheel cylinder 21 and the second wheel cylinder 22, which are two of the four wheel cylinders (RR, RL, FR, FL), and the second hydraulic circuit 1520 can control the hydraulic pressure applied to the third wheel cylinder 23 and the fourth wheel cylinder 24, which are the other two wheel cylinders.

[0093] The first hydraulic circuit 1510 can be configured to branch into two flow paths connected to the first wheel cylinder 21 and the second wheel cylinder 22, to supply hydraulic pressure from the hydraulic supply device 1300 via the hydraulic control unit 1400 to the first wheel cylinder 21 and the second wheel cylinder 22. Similarly, the second hydraulic circuit 1520 can be configured to branch into two flow paths connected to the third wheel cylinder 23 and the fourth wheel cylinder 24, to supply hydraulic pressure from the hydraulic supply device 1300 via the hydraulic control unit 1400 to the third wheel cylinder 23 and the fourth wheel cylinder 24.

[0094] The first hydraulic circuit 1510 and the second hydraulic circuit 1520 may be respectively equipped with first and second inlet valves 1511a and 1511b and third and fourth inlet valves 1521a and 1521b to control the flow and hydraulic pressure of the pressurized medium transmitted to the first to fourth wheel cylinders 21, 22, 23, and 24. The first to fourth inlet valves 1511a, 1511b, 1521a, and 1521b may be respectively located upstream of the first to fourth wheel cylinders 21, 22, 23, and 24, and may be configured as normally open solenoid valves that operate to close the valve when receiving an electrical signal from the electronic control unit.

[0095] In the inspection mode described later, the first inlet valve 1511a and the second inlet valve 1511b can be controlled to be open. When the hydraulic supply device 1300 generates hydraulic pressure to execute the inspection mode, in order to perform precise control of the motor (not shown) even at a lower target pressure, it is necessary to increase the volume of the pressurized medium. Therefore, in the first inspection mode of the electronic braking system 1000 described later, at least one of the first inlet valve 1511a and the second inlet valve 1511b is controlled to be open, thereby increasing the volume of the pressurized medium supplied from the hydraulic supply device 1300. On the other hand, in the first inspection mode, the third inlet valve 1521a and the fourth inlet valve 1521b are controlled to be closed to prevent hydraulic pressure supplied from the hydraulic supply device 1300 from leaking to the second backup flow path 1620 side, thereby ensuring the speed and accuracy of the inspection mode. This will be explained in detail later.

[0096] The first hydraulic circuit 1510 and the second hydraulic circuit 1520 may each include first to second check valves 1513a and 1513b and third to fourth check valves 1523a and 1523b, respectively. The first to fourth check valves 1513a, 1513b, 1523a and 1523b are arranged in parallel with the first to fourth inlet valves 1511a, 1511b, 1521a and 1521b. Check valves 1513a, 1513b, 1523a, and 1523b can be installed on the bypass flow paths connecting the first to fourth inlet valves 1511a, 1511b, 1521a, and 1521b in the first hydraulic circuit 1510 and the second hydraulic circuit 1520. They can allow only the flow of pressurized medium from each wheel cylinder to the hydraulic supply device 1300 or the hydraulic control unit 1400, while blocking the flow of pressurized medium from the hydraulic supply device 1300 or the hydraulic control unit 1400 to the wheel cylinder. The hydraulic pressure applied to each wheel cylinder can be quickly discharged through the first to fourth check valves 1513a, 1513b, 1523a, and 1523b. Even if the first to fourth inlet valves 1511a, 1511b, 1521a, and 1521b are not operating normally, the hydraulic pressure applied to the wheel cylinder can be smoothly recovered to the hydraulic supply device 1300.

[0097] The second hydraulic circuit 1520 may be equipped with a first outlet valve 1522a and a second outlet valve 1522b to control the flow of pressurized medium discharged from the third wheel cylinder 23 and the fourth wheel cylinder 24, thereby improving performance when releasing the brakes of the third wheel cylinder 23 and the fourth wheel cylinder 24. The first outlet valve 1522a and the second outlet valve 1522b are respectively located on the discharge side of the third wheel cylinder 23 and the fourth wheel cylinder 24 to control the flow of pressurized medium transmitted from the third wheel cylinder 23 and the fourth wheel cylinder 24 to the reservoir 1100. The first outlet valve 1522a and the second outlet valve 1522b may be configured as normally closed solenoid valves that operate to open the valves when receiving an electrical signal from the electronic control unit. The first outlet valve 1522a and the second outlet valve 1522b can selectively release the hydraulic pressure applied to the pressurized medium of the third wheel cylinder 23 and the fourth wheel cylinder 24 and transmit it to the reservoir 1100 side when the vehicle is in ABS (anti-lock braking system) braking mode.

[0098] The first backup flow path 1610, described later, may branch and connect to the first wheel cylinder 21 and the second wheel cylinder 22 of the first hydraulic circuit 1510, and the first backup flow path 1610 may be provided with at least one first shut-off valve 1611 to control the flow of pressurized medium between the first wheel cylinder 21, the second wheel cylinder 22 and the integrated master cylinder 1200.

[0099] The electronic braking system 1000 according to a first embodiment of the present invention may include a first backup flow path 1610 and a second backup flow path 1620, so that when normal operation is not possible due to device failure or other reasons, the pressurized medium discharged from the integrated master cylinder 1200 can be directly supplied to the wheel cylinder to achieve braking. The mode in which the hydraulic pressure of the integrated master cylinder 1200 is directly transmitted to the wheel cylinder is called the abnormal operation mode, i.e., the fallback mode.

[0100] The first backup flow path 1610 can be configured to connect the first main chamber 1220a and the first hydraulic circuit 1510 of the integrated master cylinder 1200, and the second backup flow path 1620 can be configured to connect the second main chamber 1230a and the second hydraulic circuit 1520 of the integrated master cylinder 1200.

[0101] One end of the first backup flow path 1610 can be connected to the first main chamber 1220a, and the other end can branch and connect to the downstream side of the first inlet valve 1511a and the second inlet valve 1511b on the first hydraulic circuit 1510. One end of the second backup flow path 1620 can be connected to the second main chamber 1230a, and the other end can be connected between the third inlet valve 1521a and the first outlet valve 1522a on the second hydraulic circuit 1520. Figure 1 Although the diagram shows the second backup flow path 1620 connected between the fourth inlet valve 1521b and the second outlet valve 1522b, it should be understood in the same way that the second backup flow path 1620 branches and connects to at least one of the upstream sides of the first outlet valve 1522a and the second outlet valve 1522b.

[0102] The first backup flow path 1610 may be provided with at least one first shut-off valve 1611 for controlling the bidirectional flow of the pressurized medium, and the second backup flow path 1620 may be provided with a second shut-off valve 1621 for controlling the bidirectional flow of the pressurized medium. The first shut-off valve 1611 and the second shut-off valve 1621 may be configured as normally open solenoid valves that are normally open and operate to close the valve when a shut-off signal is received from the electronic control unit.

[0103] like Figure 1 As shown, a pair of first shut-off valves 1611 may also be respectively disposed on the first wheel cylinder 21 and the second wheel cylinder 22 side, and as described below, the first shut-off valves 1611 may selectively release the hydraulic pressure of the pressurized medium applied to the first wheel cylinder 21 and the second wheel cylinder 22 during the check preparation mode or the vehicle's ABS braking mode, to discharge the hydraulic pressure to the reservoir 1100 side via the first backup flow path 1610, the first main chamber 1220a, the second branch flow path 1920 (described later), the check flow path 1900, and the second release control unit 1820. This will be described in detail later.

[0104] When the first shut-off valve 1611 and the second shut-off valve 1621 are closed, the pressurized medium from the integrated master cylinder 1200 is prevented from being directly transmitted to the wheel cylinders, while also preventing hydraulic leakage from the hydraulic supply device 1300 to the integrated master cylinder 1200 side. Conversely, when the first shut-off valve 1611 and the second shut-off valve 1621 are opened, the pressurized medium pressurized in the integrated master cylinder 1200 can be directly supplied to the first hydraulic circuit 1510 and the second hydraulic circuit 1520 side through the first backup flow path 1610 and the second backup flow path 1620 to achieve braking.

[0105] The flow path 1900 is configured to connect the integrated master cylinder 1200 and the release control unit 1800, and is configured to check for leaks in various components installed in the integrated master cylinder 1200 and the simulator valve 1711.

[0106] One end of the inspection flow path 1900 can be connected to the second release control unit 1820, and the other end can be connected to the first main chamber 1220a. It can branch into a first branch flow path 1910 and a second branch flow path 1920, which are respectively connected to the third hydraulic port 1280c and the fourth hydraulic port 1280d. One end of the inspection flow path 1900 can be equipped with an inspection valve 1901 that controls the bidirectional flow of the pressurized medium. The first branch flow path 1910 is equipped with a first inspection check valve 1911 that only allows the flow of the pressurized medium from the second release control unit 1820 to the first main chamber 1220a and blocks the flow of the pressurized medium in the opposite direction. The second branch flow path 1920 can be equipped with a second inspection check valve 1921 that only allows the flow of the pressurized medium from the first main chamber 1220a to the second release control unit 1820 and blocks the flow of the pressurized medium in the opposite direction. The check valve 1901 can be configured as a normally open type solenoid valve that is normally open and operates to close when an electrical signal is received from the electronic control unit. The check valve 1901 can be controlled to be closed in a first check mode of the electronic braking system 1000 and controlled to be open in a second check mode.

[0107] The electronic braking system 1000 may include: a first pressure sensor PS1 for sensing the hydraulic pressure of the pressurized medium supplied by the hydraulic supply device 1300; and a second pressure sensor PS2 for sensing the hydraulic pressure of the second main chamber 1230a. The first pressure sensor PS1 may be disposed on the first hydraulic circuit 1510 side to sense the hydraulic pressure of the pressurized medium generated, supplied, and transmitted to the first hydraulic circuit 1510 from the hydraulic supply device 1300 during inspection mode. The second pressure sensor PS2 may be disposed between the second main chamber 1230a and the second shut-off valve 1621 on the second backup flow path 1620 to sense the hydraulic pressure of the pressurized medium contained in the second main chamber 1230a. During the first inspection mode, as described later, the pressure values ​​of the pressurized medium sensed by the first pressure sensor PS1 and the second pressure sensor PS2 may be sent to the electronic control unit, which may compare the hydraulic pressure values ​​sensed by the first pressure sensor PS1 and the second pressure sensor PS2 to determine whether the integrated master cylinder 1200 or the simulator valve 1711 is leaking. Additionally, the electronic braking system 1000 may include a stroke sensor (not shown) that measures the displacement of the hydraulic piston 1320 of the hydraulic supply device 1300. This stroke sensor can check for leaks in the integrated master cylinder 1200 based on the displacement information of the hydraulic piston 1320 during a second inspection mode, as described later. (See also...) Figure 4 and Figure 5 This will be explained in detail.

[0108] The operation method of the electronic braking system 1000 according to the first embodiment of the present invention will be described below.

[0109] The electronic braking system 1000 according to a first embodiment of the present invention may include: a check preparation mode; and a first check mode and a second check mode, for checking whether the integrated master cylinder 1200 and the simulator valve 1711 are leaking.

[0110] First, the inspection preparation mode of the electronic braking system 1000 according to the first embodiment of the present invention will be described, wherein the inspection preparation mode corresponds to the preparation operation before performing the inspection mode.

[0111] Figure 3 This is a hydraulic circuit diagram showing the state of the electronic braking system 1000 performing a check preparation mode according to a first embodiment of the present invention. (Refer to...) Figure 3 Before checking for leaks in the integrated master cylinder 1200 or simulator valve 1711, the electronic control unit can first execute a check preparation mode to improve the accuracy of the check.

[0112] In the check preparation mode, the electronic control unit opens the first shut-off valve 1611 and the check valve 1901, and controls the second release control unit 1820 to hydraulically connect the check flow path 1900 and the reservoir 1100, thereby allowing the pressurized medium applied to the first cylinder 21 and the second cylinder 22 to be discharged into the reservoir 1100. Specifically, by opening the first shut-off valve 1611 and the check valve 1901, the pressurized medium applied to the first cylinder 21 and the second cylinder 22 is discharged into the reservoir 1100 sequentially via the first backup flow path 1610, the first main chamber 1220a, the first shut-off orifice 1220d, the second branch flow path 1920, and the second release control unit 1820.

[0113] Similarly, the electronic control unit can open the second shut-off valve 1621 to discharge the pressurized medium applied to the third cylinder 23 and the fourth cylinder 24 into the reservoir 1100. By opening the second shut-off valve 1621, the pressurized medium applied to the third cylinder 23 and the fourth cylinder 24 is discharged into the reservoir 1100 sequentially via the second backup flow path 1620, the second main chamber 1230a, the second shut-off orifice 1230d, and the second reservoir flow path 1720.

[0114] By checking the preparation mode, the electronic braking system 1000 can be set to its initial state while removing the hydraulic pressure applied to the first to fourth wheel cylinders 21, 22, 23, 24, to ensure the accuracy of the first and second check modes described later.

[0115] After executing the check preparation mode, the electronic control unit can enter the first check mode to check for leaks in the integrated master cylinder 1200 and simulator valve 1711.

[0116] Figure 4 This is a hydraulic circuit diagram showing the state of the electronic braking system 1000 according to a first embodiment of the present invention performing a first inspection mode. (Refer to...) Figure 4 The electronic control unit operates the motor to move the hydraulic piston 1320 forward to generate hydraulic pressure in the first pressure chamber 1330. Simultaneously, the simulator valve 1711, check valve 1901, third inlet valve 1521a, fourth inlet valve 1521b, and second shut-off valve 1621 are closed, while the first inlet valve 1511a, second inlet valve 1511b, and first shut-off valve 1611 are opened. Therefore, the hydraulic pressure generated in the first pressure chamber 1330 flows sequentially into the first main chamber 1220a via the hydraulic control unit 1400, the first inlet valve 1511a and second inlet valve 1511b of the first hydraulic circuit 1510, and the first backup flow path 1610. At this time, the second shut-off valve 1621 is closed, thus sealing the second main chamber 1230a.

[0117] In this state, the electronic control unit can compare the hydraulic pressure values ​​measured by the first pressure sensor PS1 and the second pressure sensor PS2 to check for leaks in the integrated master cylinder 1200 and the simulator valve 1711. Specifically, if there are no leaks in the components installed in the integrated master cylinder 1200 and the simulator valve 1711, when the hydraulic pressure value of the hydraulic supply device 1300 measured by the first pressure sensor PS1 reaches the target pressure, this hydraulic pressure flows into the first main chamber 1220a via the first backup flow path 1610 to press the second master piston 1230 forward, thereby synchronizing the hydraulic pressure value of the second main chamber 1230a sensed by the second pressure sensor PS2 with the hydraulic pressure value sensed by the first pressure sensor PS1. When the hydraulic pressure values ​​sensed by the first pressure sensor PS1 and the second pressure sensor PS2 synchronize for a predetermined time, the electronic control unit can determine that it is in a normal state, thereby terminating the first check mode.

[0118] In contrast, when the hydraulic pressure value measured by the second pressure sensor PS2 is lower than that measured by the first pressure sensor PS1, it can be determined that there is a leak in the integrated master cylinder 1200 and the simulator valve 1711. Specifically, when the hydraulic pressure value of the pressurized medium pressurized by the hydraulic supply device 1300, as measured by the first pressure sensor PS1, reaches the target pressure and is maintained at that pressure for a predetermined time, but the hydraulic pressure value of the second main chamber 1230a sensed by the second pressure sensor PS2 is lower than that sensed by the first pressure sensor PS1, or the hydraulic pressure value sensed by the first pressure sensor PS1 is also gradually decreasing, it is considered that there is a leak in the integrated master cylinder 1200 and the simulator valve 1711, causing the hydraulic pressure of the second main chamber 1230a to fail to reach the target pressure. Therefore, the electronic control unit can determine that it is an abnormal state.

[0119] As described above, the electronic braking system 1000 according to the first embodiment of the present invention can determine, through a first inspection mode, whether various components provided in the integrated master cylinder 1200 are normal, specifically whether the first sealing component 1290a, the second sealing component 1290b, the fourth sealing component 1290d, and the first inspection check valve 1911 are normal, and can also determine whether the simulator valve 1711 and the simulator check valve 1731 are normal. Furthermore, it can also determine whether the peripheral components connected to the integrated master cylinder 1200, such as the second shut-off valve 1621, are normal.

[0120] When the result of the first inspection mode indicates that there is a leak in the integrated master cylinder 1200 or the simulator valve 1711, the electronic control unit can notify the driver of the abnormal state through the display or warning sound, and guide and restrict the operation of the vehicle.

[0121] When the result of executing the first check mode is determined to be normal, the electronic control unit can enter the second check mode.

[0122] Figure 5 This is a hydraulic circuit diagram showing the state of the electronic braking system 1000 according to a first embodiment of the present invention performing a second inspection mode. (Refer to...) Figure 5 The electronic control unit operates the motor to move the hydraulic piston 1320 backward to generate hydraulic pressure in the second pressure chamber 1340. Simultaneously, the second release control unit 1820 can disconnect the hydraulic connection between the second pressure chamber 1340 and the reservoir 1100, allow the hydraulic connection between the second pressure chamber 1340 and the inspection flow path 1900, and open the inspection valve 1901. Therefore, the hydraulic pressure generated in the second pressure chamber 1340 is sequentially transmitted to the third hydraulic port 1280c via the second release control unit 1820, the inspection flow path 1900, and the first branch flow path 1910. At this time, the first inspection check valve 1911 allows the flow of pressurized medium from the second release control unit 1820 to the first main chamber 1220a, so that the pressurized medium can be stably transmitted to the third hydraulic port 1280c side.

[0123] The third sealing component 1290c is configured to block the flow of pressurized medium from the first branch flow path 1910 to the first main chamber 1220a. When the third sealing component 1290c is in normal condition, the hydraulic piston 1320 can no longer form hydraulic pressure in the second pressure chamber 1340 after the third hydraulic port 1280c is closed and the hydraulic piston 1320 moves backward by a predetermined displacement.

[0124] Therefore, when the displacement of the hydraulic piston measured by the stroke sensor (not shown) is within a predetermined range, the electronic control unit can determine that the third sealing component 1290c is in a normal state, thereby terminating the second inspection mode. Conversely, when the displacement of the hydraulic piston measured by the stroke sensor (not shown) exceeds the predetermined range or gradually increases, the electronic control unit can consider that the third sealing component 1290c is leaking and determine it as an abnormal state, notifying the user via a display or warning sound, and guiding the restriction of vehicle operation.

[0125] The electronic braking system 2000 according to the second embodiment of the present invention will be described below.

[0126] In the following description of the electronic braking system 2000 according to a second embodiment of the present invention, except where additional descriptions are given using separate reference numerals, the description is the same as that of the electronic braking system 1000 according to the first embodiment of the present invention described above, and therefore the description will be omitted to prevent repetition.

[0127] Figure 6This is a hydraulic circuit diagram illustrating an electronic braking system 2000 according to a second embodiment of the present invention.

[0128] Reference Figure 6 According to a second embodiment of the present invention, an electronic braking system 2000 includes: a reservoir 1100 for storing a pressurized medium; an integrated master cylinder 2200 for providing the driver with a reaction force based on the pedal force of the brake pedal 10, while simultaneously pressurizing and discharging the pressurized medium, such as brake fluid, contained within it; a hydraulic supply device 1300 for receiving the driver's braking intention as an electrical signal via a pedal displacement sensor for sensing the displacement of the brake pedal 10, and generating hydraulic pressure for the pressurized medium through mechanical operation; a hydraulic control unit 1400 for controlling the hydraulic pressure supplied from the hydraulic supply device 1300; and hydraulic circuits 1510 and 1520, each equipped with a wheel cylinder receiving... The hydraulic pressure of the pressurized medium is used to apply the brakes to each wheel (RR, RL, FR, FL); the release control unit 1800 is located between the hydraulic supply device 1300 and the reservoir 1100 to control the flow of the pressurized medium; the backup flow paths 1610 and 1620 are hydraulically connected to the integrated master cylinder 2200 and the hydraulic circuits 1510 and 1520; the reservoir flow path is hydraulically connected to the reservoir 1100 and the integrated master cylinder 2200; the inspection flow path 2900 is connected to the main chamber of the integrated master cylinder 2200; and the electronic control unit (ECU) (not shown) controls the hydraulic supply device 1300 and various valves based on hydraulic information and pedal displacement information.

[0129] The integrated master cylinder 2200 is configured to provide a reaction force to the driver when the driver applies pedal force to the brake pedal 10 to perform a braking operation, thereby providing a stable pedal feel, while pressurizing and discharging the pressurized medium contained inside according to the operation of the brake pedal 10.

[0130] Figure 7 It is shown in magnification Figure 6 The diagram shows the integrated master cylinder 2200. (Refer to...) Figure 6 and Figure 7 In the integrated master cylinder 2200, the analog part that provides pedal feel to the driver and the master cylinder part that pressurizes and discharges the pressurized medium contained inside according to the pedal force of the brake pedal can be arranged coaxially in a cylinder body 1210.

[0131] In the first main chamber 1220a, pressurized medium can flow in and out through the first hydraulic port 1280a, the second hydraulic port 1280b, the third hydraulic port 2280c, and the fourth hydraulic port 2280d. The first hydraulic port 1280a can be connected to the first reservoir flow path 1710, described later, so that pressurized medium flows from the reservoir 1100 into the first main chamber 1220a, or pressurized medium contained in the first main chamber 1220a is discharged into the reservoir 1100. The second hydraulic port 1280b can be connected to the first backup flow path 1610, described later, so that pressurized medium is discharged from the first main chamber 1220a to the first backup flow path 1610 side, or conversely, pressurized medium flows from the first backup flow path 1610 into the first main chamber 1220a side.

[0132] The first main chamber 1220a can be connected to the auxiliary inspection flow path 2910 (described later) via the third hydraulic port 2280c, allowing pressurized medium to flow from the reservoir 1100 into the first main chamber 1220a through the auxiliary inspection flow path 2910. Alternatively, the first main chamber 1220a can be connected to the inspection flow path 2900 (described later) via the fourth hydraulic port 2280d, allowing pressurized medium contained in the first main chamber 1220a to be discharged to the inspection flow path 2900 side, or for pressurized medium to flow from the inspection flow path 2900 into the first main chamber 1220a.

[0133] The first master piston 1220 is provided with a first shut-off hole 1220d, which communicates with the first main chamber 1220a and, in the non-operating state (i.e., the preparatory state before displacement), communicates with the fourth hydraulic port 2280d and the inspection flow path 2900. Additionally, a first sealing member 1290a can be provided between the outer peripheral surface of the first master piston 1220 and the cylinder body 1210 to seal the first main chamber 1220a from the outside. The first sealing member 1290a can be configured to be disposed in a receiving groove recessed into the inner peripheral surface of the cylinder body 1210 and in contact with the outer peripheral surface of the first master piston 1220. The first sealing member 1290a prevents the pressurized medium contained in the first main chamber 1220a from leaking to the outside while preventing external foreign matter from flowing into the first main chamber 1220a. The first sealing member 1290a can be located on the outermost side of the inner circumferential surface of the cylinder body 1210, that is, behind the fourth hydraulic port 2280d to which the inspection flow path 2900 is connected (described later). Figure 6 (Based on the right side).

[0134] A third sealing member 2290c may be provided between the outer peripheral surface of the first main piston 1220 and the cylinder body 1210. The third sealing member 2290c is configured to allow only the flow of pressurized medium from the auxiliary inspection flow path 2910 connected to the third hydraulic port 2280c into the first main chamber 1220a, and to block the flow of pressurized medium discharged from the first main chamber 1220a to the auxiliary inspection flow path 2910. The third sealing member 2290c may be respectively disposed in a pair of receiving grooves respectively recessed in front of and behind the third hydraulic port 2280c formed on the inner peripheral surface of the cylinder body 1210 and in contact with the outer peripheral surface of the first main piston 1220. A pair of third sealing members 2290c may be disposed in front of the first sealing member 1290a (towards...). Figure 1 (Based on the left side), it allows the flow of pressurized medium from the auxiliary inspection flow path 2910 into the first main chamber 1220a, and blocks the flow of pressurized medium contained in the first main chamber 1220a to the auxiliary inspection flow path 2910 through the third hydraulic port 2280c.

[0135] The flow path 2900 is configured to connect the integrated master cylinder 2200 and the reservoir 1100, and is configured to check for leaks in various components installed in the integrated master cylinder 2200 and the simulator valve 1711.

[0136] One end of the inspection flow path 2900 can be connected to the reservoir 1100, and the other end can be connected to the fourth hydraulic port 2280d of the first main chamber 1220a. The inspection flow path 2900 may be equipped with an inspection valve 2901 that controls the bidirectional flow of the pressurized medium. The inspection valve 2901 can be configured as a normally open solenoid valve that is normally open and operates to close when an electrical signal is received from the electronic control unit. The inspection valve 2901 can be controlled to be closed in the inspection mode of the electronic braking system 2000. Additionally, one end of the auxiliary inspection flow path 2910 is connected to the reservoir 1100, and the other end is connected to the third hydraulic port 2280c of the first main chamber 1220a, thereby assisting the flow of the pressurized medium.

[0137] The operation method of the electronic braking system 2000 according to the second embodiment of the present invention will be described below.

[0138] The electronic braking system 2000 according to a second embodiment of the present invention may include: a check preparation mode; and a check mode for leaks in the integrated master cylinder 2200 and the simulator valve 1711.

[0139] First, the inspection preparation mode of the electronic braking system 2000 according to the second embodiment of the present invention will be described, wherein the inspection preparation mode corresponds to the preparation operation before performing the inspection mode.

[0140] Figure 8 This is a hydraulic circuit diagram showing the state of the electronic braking system 2000 according to a second embodiment of the present invention performing a check preparation mode. (Refer to...) Figure 8 Before checking for leaks in the integrated master cylinder 2200 or simulator valve 1711, the electronic control unit can first execute a check preparation mode to improve the accuracy of the check.

[0141] During the check preparation mode, the electronic control unit opens the first shut-off valve 1611 and the check valve 2901, thereby discharging the pressurized medium applied to the first cylinder 21 and the second cylinder 22 into the reservoir 1100. Specifically, by opening the first shut-off valve 1611 and the check valve 2901, the pressurized medium applied to the first cylinder 21 and the second cylinder 22 is discharged into the reservoir 1100 sequentially via the first backup flow path 1610, the first main chamber 1220a, the first shut-off orifice 1220d, and the check flow path 2900.

[0142] Similarly, the electronic control unit can open the second shut-off valve 1621 to discharge the pressurized medium applied to the third cylinder 23 and the fourth cylinder 24 into the reservoir 1100. By opening the second shut-off valve 1621, the pressurized medium applied to the third cylinder 23 and the fourth cylinder 24 is discharged into the reservoir 1100 sequentially via the second backup flow path 1620, the second main chamber 1230a, the second shut-off orifice 1230d, and the second reservoir flow path 1720.

[0143] By checking the preparation mode, the electronic braking system 2000 can be set to its initial state while removing the hydraulic pressure applied to the first to fourth wheel cylinders 21, 22, 23, and 24, to ensure the accuracy of the check mode described later.

[0144] After executing the check preparation mode, the electronic control unit can enter the check mode to check for leaks in the integrated master cylinder 2200 and simulator valve 1711.

[0145] Figure 9 This is a hydraulic circuit diagram showing the state of the electronic braking system 2000 performing a check mode according to a second embodiment of the present invention. (Refer to...) Figure 9The electronic control unit operates the motor to move the hydraulic piston 1320 forward or backward to generate hydraulic pressure in pressure chambers 1330 and 1340. Simultaneously, the simulator valve 1711, check valve 2901, third inlet valve 1521a, fourth inlet valve 1521b, and second shut-off valve 1621 are closed, while the first inlet valve 1511a, second inlet valve 1511b, and first shut-off valve 1611 are opened. Therefore, the hydraulic pressure generated in the first pressure chamber 1330 flows sequentially into the first main chamber 1220a via the hydraulic control unit 1400, the first inlet valve 1511a and second inlet valve 1511b of the first hydraulic circuit 1510, and the first backup flow path 1610. At this time, the second shut-off valve 1621 is closed, thus sealing the second main chamber 1230a.

[0146] In this state, the electronic control unit can compare the hydraulic pressure values ​​measured by the first pressure sensor PS1 and the second pressure sensor PS2 to check for leaks in the integrated master cylinder 2200 and the simulator valve 1711. Specifically, if there are no leaks in the components installed in the integrated master cylinder 2200 and the simulator valve 1711, the hydraulic pressure value of the hydraulic supply device 1300 measured by the first pressure sensor PS1 reaches the target pressure. Simultaneously, this hydraulic pressure flows into the first main chamber 1220a via the first backup flow path 1610 to press the second master piston 1230 forward, thereby synchronizing the hydraulic pressure value of the second main chamber 1230a sensed by the second pressure sensor PS2 with the hydraulic pressure value sensed by the first pressure sensor PS1. When the hydraulic pressure values ​​sensed by the first pressure sensor PS1 and the second pressure sensor PS2 synchronize for a predetermined time, the electronic control unit can determine that it is in a normal state and thus terminate the inspection mode.

[0147] In contrast, when the hydraulic pressure value measured by the second pressure sensor PS2 is lower than that measured by the first pressure sensor PS1, it can be determined that there is a leak in the integrated master cylinder 2200 and the simulator valve 1711. Specifically, when the hydraulic pressure value of the pressurized medium pressurized by the hydraulic supply device 1300, as measured by the first pressure sensor PS1, reaches the target pressure and is maintained at that pressure for a predetermined time, but the hydraulic pressure value of the second main chamber 1230a sensed by the second pressure sensor PS2 is lower than that sensed by the first pressure sensor PS1, or the hydraulic pressure value sensed by the first pressure sensor PS1 is also gradually decreasing, it is considered that there is a leak in the integrated master cylinder 2200 and the simulator valve 1711, causing the hydraulic pressure of the second main chamber 1230a to fail to reach the target pressure. Therefore, the electronic control unit can determine that it is an abnormal state.

[0148] As described above, the electronic braking system 2000 according to the second embodiment of the present invention can determine, through an inspection mode, whether various components provided in the integrated master cylinder 2200 are functioning properly, specifically whether the first sealing component 1290a, the second sealing component 2290b, the fourth sealing component 1290d, the simulator valve 1711, and the simulator check valve 1731 are functioning properly. Furthermore, it can also determine whether surrounding components connected to the integrated master cylinder 2200, such as the second shut-off valve 1621, are functioning properly.

[0149] When the inspection results indicate that there is a leak in the integrated master cylinder 2200 or the simulator valve 1711, the electronic control unit can notify the driver of the abnormal state through the display or warning sound and guide the vehicle to operate in a restricted manner.

Claims

1. An electronic braking system, comprising: A reservoir for storing pressurized media; An integrated master cylinder includes: a master piston connected to a brake pedal; a master chamber whose volume changes according to the displacement of the master piston; and a sealing component that seals the master chamber. The simulator valve controls the flow of the pressurized medium between the reservoir and the main chamber; The hydraulic supply device operates a hydraulic piston to generate hydraulic pressure based on an electrical signal output in response to the displacement of the brake pedal. A hydraulic control unit is disposed between the hydraulic supply device and the plurality of wheel cylinders to control the flow of the pressurized medium supplied to the plurality of wheel cylinders; A release control unit is provided between the reservoir and the hydraulic supply device to control the flow of the pressurized medium; A backup flow path connects the main chamber and the hydraulic control unit; A shut-off valve is installed in the backup flow path to control the flow of the pressurized medium; A first pressure sensor senses the hydraulic pressure supplied by the hydraulic supply device; A second pressure sensor senses the hydraulic pressure in the main chamber; Check the flow path, connecting the main chamber and the release control unit; and A check valve is provided in the check flow path to control the flow of the pressurized medium. The integrated master cylinder includes: A first master piston is connected to the brake pedal; a first main chamber has a volume that changes according to the displacement of the first master piston. One end of the inspection flow path is connected to the release control unit, and the other end branches into a first branch flow path and a second branch flow path, which are respectively connected to the first main chamber. The inspection valve is located at one end of the inspection flow path. The electronic braking system further includes: A first check valve, located in the first branch flow path, allows only the flow of pressurized medium from the release control unit to the first main chamber; and A second check valve is installed in the second branch flow path, allowing only the flow of pressurized medium from the first main chamber to the release control unit.

2. The electronic braking system according to claim 1, wherein, The integrated master cylinder further includes: The second main piston is displaceable according to the displacement of the first main piston; the volume of the second main chamber changes according to the displacement of the second main piston; and the pedal simulator is disposed between the first and second main pistons and is made of a compressible and expandable elastic material. The second pressure sensor senses the hydraulic pressure in the second main chamber.

3. The electronic braking system according to claim 2, wherein, The hydraulic supply device includes: a first pressure chamber disposed in front of the hydraulic piston; and a second pressure chamber disposed behind the hydraulic piston. The release control unit includes: a first release control unit for controlling the flow of the pressurized medium between the first pressure chamber and the reservoir; and a second release control unit for controlling the flow of the pressurized medium between the second pressure chamber and the reservoir. One end of the inspection flow path is connected to the second release control unit side.

4. The electronic braking system according to claim 2, further comprising: The first liquid reservoir flow path connects the liquid reservoir and the first main chamber. The simulator valve is located in the flow path of the first reservoir.

5. The electronic braking system according to claim 2, wherein, The hydraulic control unit includes: A first hydraulic circuit controls the flow of pressurized medium supplied to the first and second wheel cylinders; and a second hydraulic circuit controls the flow of pressurized medium supplied to the third and fourth wheel cylinders. The backup flow path includes: A first backup flow path connects the first main chamber and the first hydraulic circuit; and a second backup flow path connects the second main chamber and the second hydraulic circuit. The shut-off valve includes: A first shut-off valve is disposed in the first backup flow path to control the flow of the pressurized medium; and a second shut-off valve is disposed in the second main chamber to control the flow of the pressurized medium.

6. The electronic braking system according to claim 3, wherein, The integrated master cylinder further includes: The first sealing component seals the first main chamber from the outside. The second sealing component seals the first main chamber against the second main chamber; and The third sealing component blocks the flow of pressurized medium from the first branch flow path into the first main chamber.

7. The electronic braking system according to claim 6, further comprising: The second liquid reservoir flow path connects the liquid reservoir and the second main chamber. The integrated master cylinder further includes: The fourth sealing component blocks the flow of pressurized medium from the second main chamber to the flow path of the second reservoir.

8. The electronic braking system according to claim 6, wherein, The first sealing member is disposed on the rear side of the third sealing member. The second branch flow path is connected between the first sealing component and the third sealing component in the integrated master cylinder.

9. The electronic braking system according to claim 8, wherein, The first main piston includes: The first shut-off orifice connects the first main chamber and the second branch flow path in the non-operating state. The second main piston includes: The second shut-off hole connects the flow path of the second main chamber and the second reservoir when not in operation.

10. An electronic braking system, comprising: A liquid reservoir for storing pressurized media; An integrated master cylinder includes: a master piston connected to a brake pedal; a master chamber whose volume changes according to the displacement of the master piston; and a sealing component that seals the master chamber. The simulator valve controls the flow of the pressurized medium between the reservoir and the main chamber; The hydraulic supply device operates a hydraulic piston to generate hydraulic pressure based on an electrical signal output in response to the displacement of the brake pedal. A hydraulic control unit is disposed between the hydraulic supply device and the plurality of wheel cylinders to control the flow of the pressurized medium supplied to the plurality of wheel cylinders; A backup flow path connects the main chamber and the hydraulic control unit; A shut-off valve is installed in the backup flow path to control the flow of the pressurized medium; A first pressure sensor senses the hydraulic pressure supplied by the hydraulic supply device; A second pressure sensor senses the hydraulic pressure in the main chamber; Check the flow path, connecting the reservoir and the main chamber; and A check valve is provided in the check flow path to control the flow of the pressurized medium. The main piston includes: The shut-off orifice connects the main chamber and the inspection flow path in the non-operating state, and blocks the main chamber and the inspection flow path when the main piston is displaced.

11. The electronic braking system according to claim 10, wherein, The integrated master cylinder includes: A first master piston is connected to the brake pedal; a first main chamber has a volume that changes according to the displacement of the first master piston; a second master piston is configured to be displaceable according to the displacement of the first master piston; a second main chamber has a volume that changes according to the displacement of the second master piston; and a pedal simulator is disposed between the first and second master pistons and is made of a compressible and expandable elastic material. The first main piston includes: The first shut-off hole connects the first main chamber and the inspection flow path in the non-operating state. The second pressure sensor senses the hydraulic pressure in the second main chamber.

12. The electronic braking system according to claim 11, wherein, One end of the inspection flow path is connected to the reservoir side, and the other end is connected to the first main chamber.

13. The electronic braking system according to claim 11, further comprising: The first liquid reservoir flow path connects the liquid reservoir and the first main chamber. The simulator valve is located in the flow path of the first reservoir.

14. The electronic braking system according to claim 11, wherein, The hydraulic control unit includes: A first hydraulic circuit controls the flow of pressurized medium supplied to the first and second wheel cylinders; and a second hydraulic circuit controls the flow of pressurized medium supplied to the third and fourth wheel cylinders. The backup flow path includes: A first backup flow path connects the first main chamber and the first hydraulic circuit; and a second backup flow path connects the second main chamber and the second hydraulic circuit. The shut-off valve includes: A first shut-off valve is disposed in the first backup flow path to control the flow of the pressurized medium; and a second shut-off valve is disposed in the second main chamber to control the flow of the pressurized medium.

15. The electronic braking system according to claim 12, further comprising: The auxiliary inspection flow path connects the reservoir and the first main chamber. The integrated master cylinder further includes: The first sealing component seals the first main chamber from the outside. The second sealing component seals the first main chamber against the second main chamber; and The third sealing component blocks the flow of pressurized medium from the first main chamber into the auxiliary inspection flow path.

16. The electronic braking system according to claim 15, further comprising: The second liquid reservoir flow path connects the liquid reservoir and the second main chamber. The integrated master cylinder further includes: The fourth sealing component blocks the flow of pressurized medium from the second main chamber to the flow path of the second reservoir.

17. The electronic braking system according to claim 15, wherein, The first sealing member is disposed on the rear side of the third sealing member. The inspection flow path is connected between the first sealing component and the third sealing component in the integrated master cylinder.

18. A method of operating an electronic braking system, comprising the method of operating an electronic braking system according to claim 3, including: The first and second inspection modes check for leaks in the integrated master cylinder or simulator valve. In the first inspection mode The hydraulic piston is moved forward to supply the hydraulic pressure formed in the first pressure chamber sequentially to the first main chamber via the hydraulic control unit, the hydraulic circuit, and the backup flow path. The electronic control unit compares the hydraulic pressure value sensed by the first pressure sensor with the hydraulic pressure value sensed by the second pressure sensor to determine whether there is a leak.

19. The method of operating the electronic braking system according to claim 18, wherein, In the second inspection mode The second release control unit blocks the second pressure chamber and the reservoir, and opens the inspection valve to connect the second pressure chamber and the inspection flow path. The hydraulic piston is moved backward to create hydraulic pressure in the second pressure chamber. The electronic control unit determines whether there is a leak based on the displacement of the hydraulic piston.

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