Electrohydraulic brake device

Abstract

An electro-hydraulic brake device is proposed, comprising: a main brake unit that supplies brake fluid to a plurality of wheel hydraulic cylinder units; a storage unit connected to the main brake unit, the brake fluid being stored in the storage unit; and an auxiliary brake unit selectively connected to the main brake unit, and supplying brake fluid stored in the auxiliary brake unit itself to the wheel hydraulic cylinder unit in a case where an operation error of the main brake unit occurs. When an operation error of the main brake unit occurs, the auxiliary brake unit may be driven to perform braking.

Description

Technical Field

[0001] The present application relates to an electronic hydraulic brake device, and more particularly, to an electronic hydraulic brake device capable of quickly performing auxiliary braking even when main brake fluid is blocked due to an error in main braking, thereby improving driving stability. Background Art

[0002] Generally, an electronic hydraulic brake device uses the hydraulic pressure of a master hydraulic cylinder driven by an electric motor to adjust the brake pressure of each wheel after the pedal pressure applied by the driver is detected by a sensor.

[0003] The electro-hydraulic brake system includes sensors that detect the pedal travel distance and thus measure the brake pressure required by the driver.

[0004] In addition, the electronic hydraulic brake system includes a pedal travel simulator, allowing the driver to feel the same pedal pressure as a typical hydraulic brake system.

[0005] Therefore, when the driver depresses the brake pedal, the electronic control unit detects this movement and supplies hydraulic pressure to the master cylinder.

[0006] The master hydraulic cylinder then transmits the brake hydraulic pressure to the wheel hydraulic cylinders of each wheel, thereby providing braking force to the wheels.

[0007] One problem with the electronic hydraulic brake device in the related art is that it cannot quickly provide brake hydraulic pressure to the wheel hydraulic cylinder, which may cause an accident. Therefore, there is a need to improve such electronic hydraulic brake devices.

[0008] Background art of the present disclosure is disclosed in Korean Patent Application Publication No. 2007-0104982 (published on October 30, 2007, entitled “Control Apparatus For Valve In Electro-Hydraulic Brake System”). Summary of the invention

[0009] Various embodiments for solving the above-mentioned problems are directed to providing an electronic hydraulic brake device which can quickly perform auxiliary braking even when main brake fluid is blocked due to an error in main braking, thereby improving driving stability.

[0010] In one embodiment, an electronic hydraulic brake device according to the present disclosure includes a main brake unit that supplies brake fluid to multiple wheel hydraulic cylinder units; a storage unit connected to the main brake unit, in which the brake fluid is stored; and an auxiliary brake unit that is selectively connected to the main brake unit and, in the event of an operational error of the main brake unit, supplies the brake fluid stored in the auxiliary brake unit itself to the wheel hydraulic cylinder units.

[0011] In one embodiment, in the electronic hydraulic brake device, the auxiliary brake device may be connected to a hydraulic line of the main brake unit and may be mounted on the wheel cylinder unit.

[0012] In one embodiment, in the electronic hydraulic brake device, the auxiliary brake unit may include: an auxiliary block part; an auxiliary storage part, which is formed in the auxiliary block part and brake fluid is stored in the auxiliary storage part; an auxiliary circuit part, which is formed on the auxiliary block part and regulates the brake fluid; and an auxiliary control unit, which controls the auxiliary circuit part to supply the brake fluid to the wheel hydraulic cylinder unit when an error of the main brake unit is detected.

[0013] In one embodiment, in the electronic hydraulic brake device, the auxiliary block part may include: a block body; a main connection port, which is formed on the block body and guides the connection with the main brake unit; and a wheel connection port, which is formed in the block body and guides the connection with the wheel hydraulic cylinder unit.

[0014] In one embodiment, in the electronic hydraulic brake device, the auxiliary storage part may include: a storage chamber formed in the auxiliary block part, and the brake fluid is stored in the storage chamber; a storage flow path extending from the storage chamber to the side of the auxiliary block part to form a flow path; and a storage plug, which opens and closes the storage flow path.

[0015] In one embodiment, in the electronic hydraulic brake device, the brake fluid is initially supplied to the storage chamber through the storage flow path, and, according to demand, the brake fluid supplied from the main brake unit may be stored in the storage chamber.

[0016] In one embodiment, in the electronic hydraulic brake device, the reservoir plug may block the flow of liquid while allowing the flow of gas, thereby maintaining the internal pressure of the reservoir chamber at atmospheric pressure.

[0017] In one embodiment, in the electronic hydraulic brake device, the reservoir plug may be made of a sintered metal material.

[0018] In one embodiment, in the electronic hydraulic brake device, the auxiliary circuit part may include: a first flow path, which connects the main brake unit and the wheel hydraulic cylinder unit to each other and guides the brake fluid in the main brake unit to the wheel hydraulic cylinder unit; and a second flow path, which connects the first flow path and the auxiliary storage part to each other and guides the brake fluid stored in the auxiliary storage part to the wheel hydraulic cylinder unit.

[0019] In one embodiment, in the electronic hydraulic brake device, the first flow path may include: a first pipeline connecting the main brake unit and the wheel cylinder unit to each other; and a first valve formed on the first pipeline and opening and closing the first pipeline.

[0020] In one embodiment, in the electronic hydraulic brake device, one end of the first pipeline may be connected to the main connection port, and the other end of the first pipeline may be connected to the wheel connection port.

[0021] In one embodiment, in the electronic hydraulic brake device, the second flow path may include: a second pipeline connecting the auxiliary storage part and the first flow path to each other; a second driving part formed on the second pipeline and discharging the brake fluid stored in the auxiliary storage part; and a second valve formed on the second pipeline and opening and closing the second pipeline.

[0022] In one embodiment, in the electronic hydraulic brake device, one end of the second line may be connected to the auxiliary storage portion, and the other end of the second line may be connected to a first line connecting a first valve and the wheel cylinder unit to each other.

[0023] In one embodiment, in the electronic hydraulic brake device, the second valve may be provided on a second pipeline connecting the second driving portion and the first pipeline to each other.

[0024] In one embodiment, in the electronic hydraulic brake device, the auxiliary circuit portion may further include a third flow path connecting the first flow path and the auxiliary storage portion and guiding the brake fluid.

[0025] In one embodiment, in the electronic hydraulic brake device, the third flow path may include: a third pipeline connecting the first flow path and the auxiliary storage portion to each other; and a third valve formed on the third pipeline and opening and closing the third pipeline.

[0026] In one embodiment, in the electronic hydraulic brake device, one end of the third line may be connected to a first flow path connecting the second flow path and the wheel cylinder unit to each other, and the other end of the third line may be connected to the auxiliary storage portion.

[0027] In one embodiment, in the electronic hydraulic brake device, the auxiliary circuit portion may further include a fourth flow path connecting the second flow path and the auxiliary storage portion to each other and guiding the brake fluid.

[0028] In one embodiment, in the electronic hydraulic brake device, the fourth flow path may include: a fourth pipeline connecting the second flow path and the auxiliary storage portion to each other; and a fourth valve formed on the fourth pipeline and opening and closing the fourth pipeline.

[0029] In one embodiment, in the electronic hydraulic brake device, one end of the fourth line may be connected to a second line connecting the second drive portion and the second valve to each other, and the other end of the fourth line may be connected to the auxiliary storage portion.

[0030] In the electronic hydraulic brake device according to the present disclosure, the main brake unit and the auxiliary brake unit are connected to each other using a hydraulic circuit. When an operation error of the main brake unit occurs, the auxiliary brake unit may be driven to perform braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematically shows a block diagram of an electronic hydraulic brake device according to an embodiment of the present disclosure.

[0032] Figure 2 is a diagram schematically showing a main brake unit of an electronic hydraulic brake device according to an embodiment of the present disclosure.

[0033] Figure 3 is a block diagram schematically illustrating an auxiliary braking unit according to an embodiment of the present disclosure.

[0034] Figure 4 is a diagram schematically illustrating an auxiliary block portion according to an embodiment of the present disclosure.

[0035] Figure 5 is a diagram schematically illustrating an auxiliary storage portion according to an embodiment of the present disclosure.

[0036] Figure 6 is a diagram schematically showing an auxiliary circuit portion according to an embodiment of the present disclosure.

[0037] Figure 7is a diagram schematically showing a hydraulic state of an auxiliary circuit portion occurring when a main brake unit according to an embodiment of the present disclosure is in a normal state.

[0038] Figure 8 is a diagram schematically showing a pressure-increase state obtained by an auxiliary circuit portion when a main brake unit according to an embodiment of the present disclosure is in an abnormal state.

[0039] Fig. 9 is a diagram schematically illustrating a pressure-reduced state obtained by an auxiliary circuit portion when a main brake unit according to an embodiment of the present disclosure is in an abnormal state. DETAILED DESCRIPTION

[0040] Hereinafter, an electronic hydraulic brake device according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. For the sake of clarity and convenience of description, the thickness of the lines in the accompanying drawings, the size of the constituent elements, etc. may be shown in non-precise proportions. In addition, the terms to be assigned to the constituent elements according to the present disclosure are defined in consideration of the functions of the constituent elements, and the terms may vary according to the user's intention or the manager's intention or based on the practice in the art. Therefore, these terms should be defined according to the context in accordance with this specification.

[0041] Figure 1 Schematically shows a block diagram of an electronic hydraulic brake device according to an embodiment of the present disclosure. Figure 2 Schematically shows a main brake unit 1 of an electronic hydraulic brake device according to an embodiment of the present disclosure. Figure 1 and Figure 2 The electronic hydraulic brake device according to the embodiment of the present disclosure includes a main brake unit 1 , a storage unit 2 and an auxiliary brake unit 3 .

[0042] The main brake unit 1 supplies brake fluid to a plurality of wheel cylinder units 4 through a driving motor. The storage unit 2 is connected to the main brake unit 1, and the brake fluid is temporarily stored in the storage unit 2. The auxiliary brake unit 3 is selectively connected to the main brake unit 1. In the event of an operation error in the main brake unit 1, the auxiliary brake unit 3 may supply the brake fluid stored in the auxiliary brake unit 3 itself to the wheel cylinder unit 4.

[0043] The auxiliary brake unit 3 is connected to the hydraulic line of the main brake unit 1 and can be installed on the wheel hydraulic cylinder unit 4. As an example, the auxiliary brake unit 3 can be selectively installed on the wheel hydraulic cylinder unit 4 that needs auxiliary braking.

[0044] When the main brake unit 1 operates normally, the auxiliary brake unit 3 may guide the brake fluid provided by the main brake unit 1 to the wheel hydraulic cylinder unit 4. When the main brake unit 1 operates abnormally, the auxiliary brake unit 3 may be disconnected from the main brake unit 1 and may provide the brake fluid stored in the auxiliary brake unit 3 itself to the wheel hydraulic cylinder unit 4.

[0045] The master brake unit 1 according to the embodiment of the present disclosure may include a pedal hydraulic cylinder part 110 , a master hydraulic cylinder part 120 , a first master hydraulic part 130 , and a second master hydraulic part 140 .

[0046] When the pedal 119 is pressed, the pedal cylinder part 110 may generate hydraulic pressure. The pedal cylinder part 110 may form two chambers and may provide a pedal force corresponding to the pressing of the pedal 119.

[0047] The master cylinder part 120 may detect whether the pedal 119 is operated, and may generate hydraulic pressure by driving the motor 129. The master cylinder part 120 may form a chamber, and the motor 129 may be driven in a forward or backward direction according to the pressing state of the pedal 119. The master cylinder part 120 may be connected to the pedal cylinder part 110 via a cylinder line part 128 located therebetween.

[0048] The first master hydraulic component 130 is connected to the master cylinder component 120 , and may guide brake fluid to one or more of the plurality of wheel cylinder units 4 .

[0049] More specifically, the first master hydraulic component 130 may include a (1-1)th hydraulic line component 131 connected to the master hydraulic cylinder component 120 and guiding the brake fluid, and a (1-2)th hydraulic line component 132 branching from the (1-1)th hydraulic line component 131 and guiding the brake fluid to the first wheel hydraulic cylinder unit 5. In this case, two first wheel hydraulic cylinder units 5 may be provided on the rear wheels, respectively.

[0050] The second master hydraulic pressure component 140 connects the master cylinder component 120 and the auxiliary brake unit 3 to each other, and can guide the brake hydraulic pressure to the remaining units among the plurality of wheel cylinder units 4 .

[0051] More specifically, the second main hydraulic component 140 may include a (2-1)th hydraulic line component 141 connected to the main hydraulic cylinder component 120 and guiding the brake hydraulic pressure, and a (2-2)th hydraulic line component 142 branching from the (2-1)th hydraulic line component 141 and guiding the brake fluid to the auxiliary brake unit 3. In this case, the auxiliary brake unit 3 may be mounted on the second wheel hydraulic cylinder unit 6, and two second wheel hydraulic cylinder units 6 may be respectively provided on the front wheels.

[0052] The first wheel hydraulic cylinder unit 5 may be provided on the front wheel. The second wheel hydraulic cylinder unit 6 may be provided on the rear wheel. The auxiliary brake unit 3 may be provided to the main power driving wheel in a vehicle driving manner. In addition, the auxiliary brake unit 3 may be installed on the first wheel hydraulic cylinder unit 5 and the second wheel hydraulic cylinder unit 6, respectively.

[0053] Figure 3 Schematically shows a block diagram of the auxiliary brake unit 3 according to an embodiment of the present disclosure. Figure 3 , the auxiliary brake unit 3 according to an embodiment of the present disclosure may include an auxiliary block part 10 , an auxiliary storage part 20 , an auxiliary circuit part 30 , and an auxiliary control unit 40 .

[0054] The auxiliary block portion 10 may be mounted on the wheel cylinder unit 4. As an example, the auxiliary block portion 10 may be integrally connected to the wheel cylinder unit 4, or may be coupled to the wheel cylinder unit 4. Furthermore, the auxiliary block portion 10 may be mounted on a wheel hub bearing.

[0055] The auxiliary storage portion 20 may be formed in the auxiliary block portion 10, and the brake fluid may be stored in the auxiliary storage portion 20. As an example, the auxiliary storage portion 20 may be formed within the auxiliary block portion 10.

[0056] The auxiliary circuit part 30 may be formed on the auxiliary block part 10 and may adjust the brake fluid. As an example, the auxiliary circuit part 30 may be formed in the auxiliary block part 10 and may adjust the flow of the brake fluid. The auxiliary circuit part 30 is connected to the main brake unit 1, the wheel cylinder unit 4 and the auxiliary storage part 20 and may guide the flow of the brake fluid.

[0057] When an error of the main brake unit 1 is detected, the auxiliary control unit 40 may control the auxiliary circuit portion 30 so that the brake fluid present in the auxiliary circuit portion 30 is supplied to the wheel cylinder unit 4. As an example, the auxiliary control unit 40 may control the auxiliary circuit portion 30 to guide the brake fluid in the main brake unit 1 to the wheel cylinder unit 4. In addition, the auxiliary control unit 40 may disconnect the auxiliary storage portion 20 from the main brake unit 1, and may control the auxiliary circuit portion 30 to guide the brake fluid stored in the auxiliary storage portion 20 to the wheel cylinder unit 4.

[0058] Figure 4 Schematically illustrates an auxiliary block portion 10 according to an embodiment of the present disclosure. Figure 4 , the auxiliary block portion 10 according to an embodiment of the present disclosure may include a block body 11 , a main connection port 12 , and a wheel connection port 13 .

[0059] The block 11 may be manufactured using an extrusion method and may be configured as a regular hexahedral block formed of an aluminum alloy. The block 11 may be directly connected to the wheel cylinder unit 4 and may be mounted on the wheel cylinder unit 4 with a separate connector therebetween.

[0060] The main connection port 12 may be formed in the block 11 and may guide the connection with the main brake unit 1. The wheel connection port 13 may be formed in the block 11 and may guide the connection with the wheel hydraulic cylinder unit 4. As an example, the main connection port 12 and the wheel connection port 13 may be formed at different points on the block 11 according to design requirements.

[0061] Figure 5 Schematically shows the auxiliary storage portion 20 according to an embodiment of the present disclosure. Figure 5 , the auxiliary storage portion 20 according to an embodiment of the present disclosure may include a storage chamber 21 , a storage flow path 22 , and a storage plug 23 .

[0062] The storage chamber 21 may be formed in the auxiliary block portion 10 and may provide a space for storing brake fluid. As an example, the storage chamber 21 may form a space in the block 11 in an area other than the area where the auxiliary circuit portion 30 is formed. In addition, the storage chamber 21 may be manufactured as a separate chamber and may be mounted on the block 11.

[0063] The storage flow path 22 may extend from the storage chamber 21 to the side of the auxiliary block part 10 to form a flow path. As an example, the storage flow path 22 may be a hole communicating with the storage chamber 21 starting from the outer surface of the block body 11 .

[0064] The reservoir plug 23 may open and close the reservoir flow path 22. As an example, the reservoir plug 23 may be pressed into the reservoir flow path 22 or removably attached therein, thereby preventing the brake fluid stored in the reservoir chamber 21 from leaking to the outside through the reservoir flow path 22.

[0065] The brake fluid may be initially supplied to the storage chamber 21 through the storage flow path 22, and the brake fluid may be stored in the storage chamber 21. The brake fluid supplied from the service brake unit 1 may be stored in the storage chamber 21 as required.

[0066] The storage plug 23 may block the flow of liquid while allowing the flow of gas, thereby maintaining the internal pressure of the storage chamber 21 at atmospheric pressure. As an example, the storage plug 23 may be formed of a sintered metal material.

[0067] Figure 6 Schematically shows the auxiliary circuit portion 30 according to an embodiment of the present disclosure. Figure 6, the auxiliary circuit portion 30 according to an embodiment of the present disclosure may include a first flow path 31 and a second flow path 32 .

[0068] The first flow path 31 connects the main brake unit 1 and the wheel cylinder unit 4 to each other, and can guide the brake fluid in the main brake unit 1 to the wheel cylinder unit 4. As an example, one end of the first flow path 31 can be communicated with the main connection port 12, and the other end thereof can be communicated with the wheel connection port 13.

[0069] The second flow path 32 connects the first flow path 31 and the auxiliary storage portion 20 to each other, and may guide the brake fluid stored in the auxiliary storage portion 20 to the wheel cylinder unit 4. As an example, the second flow path 32 may be connected to the storage chamber 21.

[0070] More specifically, the first flow path 31 may include a first line 311 and a first valve 312 .

[0071] The first pipeline 311 may connect the main brake unit 1 and the wheel cylinder unit 4 to each other. As an example, one end of the first pipeline 311 may be connected to the main connection port 12 , and the other end thereof may be connected to the wheel connection port 13 .

[0072] The first valve 312 may be formed on the first pipeline 311 and may open and close the first pipeline 311. As an example, the first valve 312 may be a normally open valve. When not powered, the first valve 312 may open the first pipeline 311, so that the brake fluid in the main brake unit 1 may reach the wheel cylinder unit 4.

[0073] The second flow path 32 may include a second pipeline 321 , a second driving part 322 , and a second valve 323 .

[0074] The second pipeline 321 may connect the auxiliary storage portion 20 and the first flow path 31 to each other. As an example, one end of the second pipeline 321 may be connected to the storage chamber 21, and the other end thereof may be connected to the first pipeline 311 connecting the first valve 312 and the wheel cylinder unit 4 to each other.

[0075] The second driving portion 322 may be formed on the second pipeline 321, and may discharge the brake fluid stored in the auxiliary storage portion 20. As an example, the second driving portion 322 may be an oil pump or an actuator that increases the hydraulic pressure of the brake fluid.

[0076] The second valve 323 may be formed on the second pipeline 321, and may open and close the second pipeline 321. As an example, the second valve 323 may be arranged on the second pipeline 321 connecting the second driving part 322 and the first pipeline 311 to each other. The second valve 323 may be a normally closed valve. The second valve 323 may close the second pipeline 321 when not powered.

[0077] The auxiliary circuit portion 30 according to the embodiment of the present invention may further include a third flow path 33 and a fourth flow path 34 .

[0078] The third flow path 33 may guide the brake fluid by connecting the first flow path 31 and the auxiliary storage portion 20 to each other. The third flow path 33 may include a third line 331 and a third valve 332 .

[0079] The third pipeline 331 connects the first flow path 31 and the auxiliary storage part 20 to each other. A third valve 332 may be formed on the third pipeline 331, and may open and close the third pipeline 331.

[0080] One end of the third pipeline 331 may be connected to the first flow path 31 connecting the second flow path 32 and the wheel cylinder unit 4 to each other. The other end of the third pipeline 331 may be connected to the storage chamber 21 of the auxiliary storage portion 20.

[0081] The fourth flow path 34 may guide the brake fluid by connecting the second flow path 32 and the auxiliary storage portion 20 to each other. The fourth flow path 34 may include a fourth line 341 and a fourth valve 342.

[0082] One end of the fourth pipeline 341 may be connected to the second pipeline 321 connecting the second driving part 322 and the second valve 323 to each other. The other end of the fourth pipeline 341 may be connected to the storage chamber 21 of the auxiliary storage part 20. The fourth valve 342 may open and close the fourth pipeline 341. The fourth valve 342 may be automatically opened and closed according to a preset pressure.

[0083] Figure 7 is a diagram schematically showing a hydraulic state of the auxiliary circuit portion 30 that occurs when the main brake unit 1 according to an embodiment of the present disclosure is in a normal state. Figure 7 , when the main brake unit 1 is in a normal state, the auxiliary brake unit 3 opens the flow path to supply the brake fluid in the main brake unit 1 to the wheel cylinder unit 4 .

[0084] That is, the first valve 312 opens the first pipeline 311, and the second valve 323 closes the second pipeline 321. Then, the third valve 332 closes the third pipeline 331, and the fourth valve 342 opens or closes the fourth pipeline 341 according to a preset hydraulic pressure.

[0085] In the above state, the brake fluid in the main brake unit 1 reaches the wheel cylinder unit 4 through the first pipeline 311 .

[0086] Figure 8 2 is a diagram schematically showing a pressure-increasing state obtained by the auxiliary circuit portion 30 when the main brake unit 1 according to the embodiment of the present disclosure is in an abnormal state. Figure 8 , when the main brake unit 1 is in an abnormal state, the inflow and outflow of the brake fluid in the main brake unit 1 are regulated, and the auxiliary brake unit 3 supplies the brake fluid to the wheel cylinder unit 4 .

[0087] That is, the first valve 312 closes the first pipeline 311, the second valve 323 opens the second pipeline 321, and the second driving part 322 is driven. Then, the third valve 332 closes the third pipeline 331, and the fourth valve 342 opens or closes the fourth pipeline 341 according to a preset hydraulic pressure.

[0088] In the above state, when the second drive portion 322 is driven, the hydraulic pressure of the brake fluid stored in the reservoir chamber 21 increases, and the brake fluid reaches the wheel cylinder unit 4 through the second pipeline 321 and the first pipeline 311 .

[0089] Fig. 9 2 is a diagram schematically showing a pressure-reduced state obtained by the auxiliary circuit portion 30 when the main brake unit 1 according to the embodiment of the present disclosure is in an abnormal state. Fig. 9 , when the main brake unit 1 is in an abnormal state, the inflow and outflow of the brake fluid in the main brake unit 1 are regulated, and the auxiliary brake unit 3 guides the brake fluid in the wheel cylinder unit 4 to the storage chamber 21 .

[0090] That is, the first valve 312 closes the first pipeline 311, the second valve 323 closes the second pipeline 321, and the second driving part 322 is driven or stopped. Then, the third valve 332 opens the third pipeline 331, and the fourth valve 342 opens or closes the fourth pipeline 341 according to a preset hydraulic pressure.

[0091] In the above state, the brake fluid in the wheel cylinder unit 4 is recovered into the reservoir chamber 21 through the first pipeline 311 and the third pipeline 331 .

[0092] In the electronic hydraulic brake device according to the embodiment of the present disclosure, the main brake unit 1 and the auxiliary brake unit 3 are connected to each other using a hydraulic circuit. In the event of an operation error of the main brake unit 1, the auxiliary brake unit 3 may be driven to perform braking.

[0093] The embodiments of the present disclosure are described with reference to the accompanying drawings by way of example only. It will be understood by those skilled in the art that various modifications may be made to the embodiments and various equivalent contents thereof may be realized.

Claims

1. An electronic hydraulic brake device, comprising: a main brake unit configured to supply brake fluid to the wheel hydraulic cylinder units; a storage unit connected to the main brake unit and configured to store the brake fluid; as well as An auxiliary brake unit is selectively connected to the main brake unit and is configured to supply the brake fluid stored in the auxiliary brake unit to the wheel cylinder unit in the event that an operation error of the main brake unit occurs. 2 . The electronic hydraulic brake device according to claim 1 , wherein the auxiliary brake unit is connected to a hydraulic line of the main brake unit and is mounted on the wheel cylinder unit.

3. The electronic hydraulic brake device according to claim 1, wherein the auxiliary brake unit comprises: Auxiliary block part; an auxiliary storage portion disposed in the auxiliary block portion and configured to store the brake fluid; an auxiliary circuit portion disposed on the auxiliary block portion and configured to regulate the brake fluid; as well as An auxiliary controller is configured to, when an operation error of the main brake unit is detected, control the auxiliary circuit portion to supply the brake fluid stored in the auxiliary brake unit to the wheel cylinder unit.

4. The electronic hydraulic brake device according to claim 3, wherein the auxiliary block portion comprises: Block; a main connection port disposed in the block and configured to conduct a connection with the main brake unit; as well as A wheel connection port is provided in the block and is configured to conduct connection with the wheel cylinder unit.

5. The electronic hydraulic brake device according to claim 3, wherein the auxiliary storage portion comprises: a storage chamber disposed in the auxiliary block portion and configured to store the brake fluid; a storage flow path extending from the storage chamber to a side of the auxiliary block portion to form a flow path; as well as A storage plug is configured to open or close the storage flow path. 6 . The electronic hydraulic brake device according to claim 5 , wherein the brake fluid is initially supplied to the storage chamber through the storage flow path, and the brake fluid supplied from the service brake unit is configured to be stored in the storage chamber. 7 . The electronic hydraulic brake device according to claim 5 , wherein the reservoir plug is configured to block the flow of liquid while allowing the flow of gas to maintain the internal pressure of the reservoir chamber at atmospheric pressure. 8 . The electronic hydraulic brake device according to claim 5 , wherein the reservoir plug is made of a sintered metal material.

9. The electronic hydraulic brake device according to claim 4, wherein the auxiliary circuit portion comprises: a first flow path connecting the main brake unit and the wheel cylinder unit to each other and configured to guide brake fluid in the main brake unit to the wheel cylinder unit; as well as A second flow path connects the first flow path and the auxiliary storage portion to each other and is configured to guide the brake fluid stored in the auxiliary storage portion to the wheel cylinder unit.

10. The electronic hydraulic brake device according to claim 9, wherein the first flow path comprises: a first pipeline connecting the main brake unit and the wheel hydraulic cylinder unit to each other; as well as A first valve is disposed on the first pipeline and is configured to open and close the first pipeline. 11 . The electronic hydraulic brake device according to claim 10 , wherein one end of the first line is connected to the main connection port, and the other end of the first line is connected to the wheel connection port.

12. The electronic hydraulic brake device according to claim 9, wherein the second flow path comprises: a second pipeline connecting the auxiliary storage portion and the first flow path to each other; a second driving portion disposed on the second pipeline and configured to discharge the brake fluid stored in the auxiliary storage portion; as well as A second valve is disposed on the second pipeline and is configured to open and close the second pipeline. 13 . The electronic hydraulic brake device according to claim 12 , wherein one end of the second line is connected to the auxiliary storage portion, and the other end of the second line is connected to a first line connecting the first valve and the wheel cylinder unit to each other. 14 . The electronic hydraulic brake device according to claim 13 , wherein the second valve is provided on a second pipeline connecting the second drive portion and the first pipeline to each other.

15. The electronic hydraulic brake device according to claim 9, wherein the auxiliary circuit portion further comprises: A third flow path connects the first flow path and the auxiliary storage portion and is configured to guide the brake fluid.

16. The electronic hydraulic brake device according to claim 15, wherein the third flow path comprises: a third pipeline connecting the first flow path and the auxiliary storage portion to each other; as well as A third valve is disposed on the third pipeline and is configured to open and close the third pipeline. 17 . The electronic hydraulic brake device according to claim 16 , wherein one end of the third line is connected to a first flow path connecting the second flow path and the wheel cylinder unit to each other, and the other end of the third line is connected to the auxiliary storage portion.

18. The electronic hydraulic brake device according to claim 12, wherein the auxiliary circuit portion further comprises: A fourth flow path connects the second flow path and the auxiliary storage portion to each other and guides the brake fluid.

19. The electronic hydraulic brake device according to claim 18, wherein the fourth flow path comprises: a fourth pipeline connecting the second flow path and the auxiliary storage portion to each other; as well as A fourth valve is disposed on the fourth pipeline and is configured to open and close the fourth pipeline. 20 . The electronic hydraulic brake device according to claim 19 , wherein one end of the fourth line is connected to a second line connecting the second drive portion and the second valve to each other, and the other end of the fourth line is connected to the auxiliary storage portion.

Images