Electrohydraulic brake system

Abstract

Disclosed herein is an electro-hydraulic brake system including a pedal unit; a signal transmission unit configured to transmit a pressure signal of the pedal unit; and a brake unit installed on each of the wheel hydraulic cylinders to supply brake fluid to the wheel hydraulic cylinders under the control of the signal transmission unit. When the pressure signal of the pedal unit is transmitted to the brake units through the signal transmission unit, the brake units installed on the wheel hydraulic cylinders can supply brake liquid stored in the brake units to the wheel hydraulic cylinders to execute braking.

Description

Technical Field

[0001] Exemplary embodiments of the present disclosure relate to an electronic hydraulic brake system, and more particularly, to an electronic hydraulic brake system that can be installed on each wheel to provide hydraulic pressure to its wheel cylinder in response to a signal. Background Art

[0002] Typically, an electronic hydraulic brake system is used to detect the driver's pedal pressure through a sensor, and then adjust the brake pressure of each wheel using the hydraulic pressure of a master hydraulic cylinder driven by an electric motor.

[0003] The electrohydraulic brake system includes sensors that detect pedal travel so that the driver knows how much brake pressure is required.

[0004] The electronic hydraulic brake system also includes a pedal travel simulator that allows the driver to feel the same pedal pressure as a typical hydraulic brake system.

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

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

[0007] In conventional electronic hydraulic brake systems, productivity may be reduced due to the design and installation work of the pipes that guide the hydraulic pressure from the master cylinder to the wheel cylinders. Therefore, it is necessary to solve this problem.

[0008] Background of the present disclosure is disclosed in Korean Patent Application Publication No. 2007-0104982, published on October 30, 2007, entitled “VALVE CONTROL DEVICE FOR ELECTRO-HYDRAULIC BRAKE SYSTEM”. Summary of the invention

[0009] Various embodiments relate to an electronic hydraulic brake system that can be installed on each wheel to provide hydraulic pressure to its wheel cylinder in response to a signal.

[0010] In one embodiment, an electronic hydraulic brake system is provided, including a pedal unit, a signal transmission unit configured to transmit a pressure signal of the pedal unit, and a brake unit installed on each wheel hydraulic cylinder to supply brake fluid to the wheel hydraulic cylinder under the control of the signal transmission unit.

[0011] The brake unit may include a block portion mounted on a wheel hydraulic cylinder, a storage portion formed in the block portion to store the brake fluid therein, a circuit portion formed in the block portion to regulate the brake fluid, and a control portion configured to control the circuit portion to supply the brake fluid from the circuit portion to the wheel hydraulic cylinder when the control portion detects a control signal from the signal transmission unit.

[0012] The block portion may include a block body and a block port formed on the block body to establish connection with a wheel hydraulic cylinder.

[0013] The storage portion may include a storage chamber formed inside the block portion to store the brake fluid, a storage channel extending from the storage chamber to one side of the block portion to define a flow path, and a storage plug configured to open or close the storage channel.

[0014] The storage plug may block the flow of liquid and allow the flow of gas to maintain the internal pressure of the storage plug at an atmospheric pressure level.

[0015] The storage plug may be made of a sintered metal material.

[0016] The circuit portion may include a first channel connected to the storage portion to supply the brake fluid, and a second channel configured to connect the first channel to the wheel cylinder and guide the brake fluid stored in the storage portion to the wheel cylinder.

[0017] The first passage may include a first pipeline connected to the storage portion, and a first driving portion formed in the first pipeline to discharge the brake fluid stored in the storage portion.

[0018] The second passage may include a second line configured to connect the first passage to the wheel cylinder, and a second measuring portion configured to measure a pressure of the second line.

[0019] The circuit portion may include a third channel configured to connect the second channel to the storage portion to guide the brake fluid, and a fourth channel configured to connect the first channel to the storage portion to guide the brake fluid.

[0020] It can be seen from the above description that in the electronic hydraulic braking system according to the present disclosure, when the pressure signal of the pedal unit is transmitted to the brake unit through the signal transmission unit, the brake unit installed on each wheel hydraulic cylinder can supply its own stored brake fluid to the wheel hydraulic cylinder to perform braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a block diagram schematically illustrating an electronic hydraulic brake system according to an embodiment of the present disclosure.

[0022] Figure 2 is a diagram schematically showing a brake unit according to an embodiment of the present disclosure.

[0023] Figure 3 is a view schematically showing a block portion according to an embodiment of the present disclosure.

[0024] Figure 4 is a view schematically showing a storage portion according to an embodiment of the present disclosure.

[0025] Figure 5 is a diagram schematically showing a circuit portion according to an embodiment of the present disclosure.

[0026] Figure 6 is a diagram schematically showing a pressurization state in a circuit portion according to an embodiment of the present disclosure.

[0027] Figure 7 is a diagram schematically showing a decompression state in a circuit portion according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] Hereinafter, an electronic hydraulic brake system according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. It should be understood that for the sake of clarity and convenience of description, the thickness of each line or the size of each component in the accompanying drawings may be shown exaggeratedly. In addition, the terms used herein are terms defined in consideration of the functions of the present disclosure, and these terms may be changed according to the intention or practice of the user or operator. Therefore, these terms should be defined based on the entire disclosure set forth herein.

[0029] Figure 1 Schematically shows a block diagram of an electronic hydraulic brake system according to an embodiment of the present disclosure. Figure 1 , the electronic hydraulic brake system according to the embodiment of the present disclosure includes a pedal unit 1 , a signal transmission unit 2 and a brake unit 3 .

[0030] The pedal unit 1 may provide a pressure signal by the driver's pressing. For example, the pedal unit 1 may be placed under the driver's seat, and the driver may press the pedal unit 1 with his / her foot. In addition, in the automatic driving mode, the pedal unit 1 may be automatically pressed in response to a brake signal.

[0031] The signal transmission unit 2 may transmit a pressure signal of the pedal unit 1. For example, the signal transmission unit 2 may transmit a pressure signal digitized from the pressing speed, pressing force, pressing time, etc. of the pedal unit 1 to the brake unit 3 in a wired or wireless manner. Meanwhile, in the automatic driving mode, the controller may directly transmit the pressure signal to the signal transmission unit 2 without operating the pedal unit 1 according to the driving state.

[0032] The brake unit 3 may be mounted on each wheel cylinder 4 to supply brake fluid to the wheel cylinder 4 under the control of the signal transmission unit 2. For example, a total of four front wheels and rear wheels may be provided in the vehicle, and the wheel cylinder 4 may be provided on each of the front wheels and the rear wheels. When hydraulic pressure is supplied to the wheel cylinder 4, the wheel cylinder 4 may provide braking force to each of the front wheels and the rear wheels.

[0033] Figure 2 Schematically shows a brake unit according to an embodiment of the present disclosure. Figure 2 , the brake unit 3 according to the embodiment of the present disclosure may include a block part 10 , a storage part 20 , a circuit part 30 , and a control part 40 .

[0034] The block portion 10 may be mounted on each wheel cylinder 4. For example, the block portion 10 may be integrally connected to or coupled to the wheel cylinder 4. Furthermore, the block portion 10 may be mounted on a wheel hub bearing.

[0035] The storage portion 20 may be formed in the block portion 10 and may store the brake fluid therein. For example, the storage portion 20 may be formed inside the block portion 10 and may define a space for storing the brake fluid.

[0036] The circuit portion 30 may be formed in the block portion 10 and may regulate the brake fluid. For example, the circuit portion 30 may be formed inside the block portion 10 to control the flow of the brake fluid. The circuit portion 30 may guide the brake fluid stored in the storage portion 20 to the wheel cylinder 4.

[0037] When the control portion 40 detects the brake signal from the signal transmission unit 2, it can control the circuit portion 30 to supply the brake fluid stored in the storage portion 20 to the wheel cylinder 4. For example, the control portion 40 may be mounted to the block portion 10 and may have a receiver that receives the brake signal from the signal transmission unit 2.

[0038] Figure 3 Schematically shows a block diagram of an embodiment of the present disclosure. Figure 3 , the block part 10 according to an embodiment of the present disclosure may include a block body 11 and a block port 12 .

[0039] The block 11 may be formed by extrusion and may be shaped as a square block made of machined aluminum alloy. The block 11 may be directly connected to the wheel cylinder 4 or may be mounted on the wheel cylinder 4 through a separate connector.

[0040] The block port 12 may be formed on the block body 11 and may be connected to the wheel cylinder 4. For example, the block port 12 may be provided at one side of the block body 11. On the other hand, the position of the block port 12 may be varied according to design circumstances.

[0041] Figure 4 Schematically illustrates a storage portion according to an embodiment of the present disclosure. Figure 4 , the storage portion 20 according to an embodiment of the present disclosure may include a storage chamber 21 , a storage channel 22 , and a storage plug 23 .

[0042] The storage chamber 21 may be formed inside the block portion 10 and may provide a space for storing brake fluid. For example, the storage chamber 21 may define a space in a region formed inside the block 11 except for the circuit portion 30. In addition, the storage chamber 21 may be formed separately and installed in the block 11.

[0043] The storage channel 22 may extend from the storage chamber 21 to one side of the block portion 10 to define a flow path. For example, the storage channel 22 may be a hole on the outer surface of the block body 11 that communicates with the storage chamber 21.

[0044] The storage plug 23 may open or close the storage channel 22. For example, the storage plug 23 may be press-fitted into the storage channel 22 or separated from the storage channel 22 to prevent the brake fluid stored in the storage chamber 21 from leaking to the outside through the storage channel 22.

[0045] Meanwhile, the storage chamber 21 may initially receive and store the brake fluid through the storage passage 22 , and when the storage of the brake fluid in the storage chamber 21 is completed, the storage plug 23 may close the storage passage 22 .

[0046] The storage plug 23 may block the flow of liquid and allow the flow of gas to maintain the internal pressure of the storage plug 23 at the atmospheric pressure level. The storage plug 23 may be made of a sintered metal material and may allow the flow of gas.

[0047] Figure 5 Schematically shows a circuit portion according to an embodiment of the present disclosure. Figure 5 , the circuit portion 30 according to an embodiment of the present disclosure may include a first channel 31 and a second channel 32 .

[0048] The first passage 31 may be connected to the storage portion 20 for supplying brake fluid. For example, the first passage 31 may have one end connected to the storage chamber 21, and may be operated under the control of the control portion 40 to forcibly pump the brake fluid.

[0049] The second passage 32 may connect the first passage 31 to the wheel cylinder 4 and guide the brake fluid stored in the storage portion 20 to the wheel cylinder 4 .

[0050] More specifically, the first channel 31 may include a first pipeline 311 and a first driving part 312 .

[0051] The first pipeline 311 may be connected to the storage portion 20. For example, the first pipeline 311 may have one end connected to the storage chamber to guide the brake fluid stored in the storage chamber 21. The storage chamber 21 may be provided at an upper portion of the storage portion 20, and the first pipeline 311 may be connected to a lower portion of the storage chamber 21.

[0052] The first driving portion 312 may be formed in the first pipeline 311, and may discharge the brake fluid stored in the storage portion 20. The first driving portion 312 may be an oil pump or an actuator, which increases the hydraulic pressure of the brake fluid.

[0053] The second channel 32 may include a second pipeline 321 and a second measuring portion 322 .

[0054] The second pipeline 321 may connect the first passage 31 to the wheel cylinder 4. For example, the second pipeline 321 may have one end connected to the end of the first pipeline 311 and the other end connected to the wheel cylinder 4. The second pipeline 321 may communicate with the block port 12.

[0055] The second measuring part 322 may measure the pressure of the second pipeline 321. For example, the second measuring part 322 may be a pressure sensor connected to any point of the second pipeline 321 for pressure measurement.

[0056] The circuit portion 30 according to the embodiment of the present disclosure may further include a third channel 33 and a fourth channel 34 .

[0057] The third channel 33 may connect the second channel 32 to the storage portion 20 for guiding the brake fluid. For example, the third channel 33 may include a third line 331 and a third valve 332.

[0058] The third pipeline 331 may have one end connected to the second pipeline 321 and the other end connected to the storage chamber 21. For example, the third pipeline 331 may be connected to the second pipeline 321 disposed between the first pipeline 311 and the second measuring part 322.

[0059] The third valve 332 may be formed in the third pipeline 331 to open or close the third pipeline 331. For example, the third valve 332 may be a normally closed valve that normally closes the third pipeline 331 and opens the third pipeline 331 when the third valve is energized.

[0060] The fourth channel 34 may connect the first channel 31 to the storage portion 20 for guiding the brake fluid. For example, the fourth channel 34 may include a fourth line 341 and a fourth valve 342.

[0061] One end of the fourth pipeline may be connected to the first pipeline 311, which connects the first driving part 312 to the second pipeline 321. The fourth pipeline 341 may have the other end connected to the storage chamber 21. The fourth valve 342 may open or close the fourth pipeline 341. The fourth valve 342 may be automatically opened and closed based on a set pressure.

[0062] Figure 6 Schematically illustrates a pressurization state in a circuit portion according to an embodiment of the present disclosure. Figure 6 , when braking is performed by supplying hydraulic pressure to the wheel cylinder 4, the first drive portion 312 is driven. As a result, the brake fluid stored in the storage chamber 21 is supplied to the wheel cylinder 4 through the first pipeline 311 and the second pipeline 321. In this case, the fourth valve 342 opens and closes the fourth pipeline 341 based on the set hydraulic pressure.

[0063] Figure 7 Schematically illustrates a decompression state in a circuit portion according to an embodiment of the present disclosure. Figure 7 , when the wheel cylinder 4 needs to reduce the pressure, the third valve 332 opens the third pipeline 331. As a result, a part of the brake fluid supplied to the wheel cylinder 4 is supplied to the storage portion 20 through the third pipeline 331. In this case, the fourth valve 342 opens and closes the fourth pipeline 341 based on the set hydraulic pressure.

[0064] In the electronic hydraulic brake system according to an embodiment of the present disclosure, when the pressure signal of the pedal unit 1 is transmitted to the brake unit 3 through the signal transmission unit 2, the brake unit 3 installed on each wheel hydraulic cylinder 4 can supply its own stored brake fluid to the wheel hydraulic cylinder 4 to perform braking.

[0065] Although the present disclosure has been described with reference to the embodiments shown in the accompanying drawings, it will be apparent to those skilled in the art that these embodiments are provided only as examples. Those skilled in the art will appreciate that various modifications and other equivalent embodiments may be made without departing from the spirit and scope of the present disclosure.

Claims

1. An electronic hydraulic brake system, comprising: Pedal unit; a signal transmission unit configured to transmit a pressure signal of the pedal unit; as well as A brake unit is mounted on each wheel cylinder to supply brake fluid to each wheel cylinder under the control of the signal transmission unit. 2 . The electronic hydraulic brake system according to claim 1 , wherein the pedal unit is pressed in response to a driver's operation or is automatically pressed in response to a brake signal in an automatic driving mode. 3 . The electronic hydraulic brake system according to claim 1 , wherein the signal transmission unit is further configured to transmit a pressure signal digitized from a pressing speed, a pressing force, and a pressing time of the pedal unit to the brake unit.

4. The electronic hydraulic brake system according to claim 1, wherein the brake unit comprises: A block portion, which is mounted on each wheel hydraulic cylinder; a storage portion formed in the block portion to store the brake fluid therein; a circuit portion formed in the block portion to regulate the brake fluid; as well as A control portion is configured to control the circuit portion to supply the brake fluid from the circuit portion to each wheel cylinder in response to the control portion detecting the control signal from the signal transmission unit.

5. The electronic hydraulic brake system according to claim 4, wherein the block portion comprises: Block; as well as A block port is formed on the block body to establish connection with each wheel hydraulic cylinder.

6. The electronic hydraulic brake system according to claim 4, wherein the storage portion comprises: a storage chamber formed in the block portion to store the brake fluid therein; a storage channel extending from the storage chamber to one side of the block portion to define a flow path; as well as A storage plug is configured to open or close the storage channel. 7 . The electronic hydraulic brake system according to claim 6 , wherein the reservoir plug blocks the flow of liquid and allows the flow of gas to maintain the internal pressure of the reservoir plug at an atmospheric pressure level.

8. The electronic hydraulic brake system according to claim 6, wherein the reservoir plug is made of a sintered metal material.

9. The electronic hydraulic brake system according to claim 6, wherein the circuit portion comprises: a first passage connected to the storage portion to supply the brake fluid; as well as A second passage is configured to connect the first passage to each wheel cylinder and guide the brake fluid stored in the storage portion to each wheel cylinder.

10. The electronic hydraulic brake system according to claim 9, wherein the first channel comprises: a first pipeline connected to the storage portion; as well as A first driving portion is formed in the first pipeline to discharge the brake fluid stored in the storage portion. 11 . The electronic hydraulic brake system according to claim 10 , wherein the first pipeline is connected to a lower portion of the storage chamber.

12. The electronic hydraulic brake system according to claim 10, wherein the second channel comprises: a second pipeline configured to connect the first passage to each wheel hydraulic cylinder; as well as The second measuring unit is configured to measure the pressure of the second pipeline. 13 . The electronic hydraulic brake system of claim 12 , wherein the second pipeline connects the first pipeline to each wheel cylinder.

14. The electronic hydraulic brake system according to claim 12, wherein the electronic part comprises: a third passage configured to connect the second passage to the storage portion to guide the brake fluid; as well as A fourth passage is configured to connect the first passage to the storage portion to guide the brake fluid.

15. The electronic hydraulic brake system according to claim 14, wherein the third channel comprises: a third pipeline configured to connect the second pipeline to the storage chamber; as well as A third valve is formed in the third pipeline to open or close the third pipeline. 16 . The electronic hydraulic brake system according to claim 15 , wherein the third pipeline is connected to the second pipeline provided between the first pipeline and the second measuring portion. 17 . The electronic hydraulic brake system of claim 15 , wherein the third valve is a normally closed valve configured to normally close the third line and to open the third line in response to power being supplied to the third valve.

18. The electronic hydraulic brake system according to claim 14, wherein the fourth channel comprises: a fourth pipeline having a first end connected to the first pipeline disposed between the first driving portion and the second pipeline and a second end connected to the storage chamber; as well as A fourth valve is configured to open or close the fourth pipeline.

19. The electronic hydraulic brake system according to claim 14, wherein: In response to the first driving portion being driven, the brake fluid stored in the storage chamber is supplied to each wheel cylinder through the first line and the second line to perform braking.

20. The electronic hydraulic brake system according to claim 14, wherein: In response to the third passage being opened, a portion of the brake fluid supplied to each wheel cylinder is supplied to the reservoir portion through the third passage to reduce the pressure in each wheel cylinder.

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