Electro-hydraulic brake device

Abstract

An electro-hydraulic brake device. The present disclosure relates to an electro-hydraulic brake device including a main brake unit providing brake fluid to a plurality of wheel cylinder units through a drive motor, a storage unit connected to the main brake unit and configured to store the brake fluid, and an auxiliary brake unit connected to the main brake unit and the storage unit and providing the brake fluid to some of the plurality of wheel cylinder units when an operation error of the main brake unit occurs, and in which a hydraulic circuit is physically separated, so that the vehicle can be stably braked by the auxiliary brake unit even when the operation error of the main brake unit occurs.

Description

Technical Field

[0001] Exemplary embodiments of this disclosure relate to an electro-hydraulic braking device, and more specifically, to an electro-hydraulic braking device in which auxiliary braking is rapidly executed in the event of a main braking error, hydraulic circuits for clearly distinguishing each function are provided, setting pressure control routes are diversified, and bridging quality is improved. Background Technology

[0002] Typically, an electro-hydraulic braking system controls the braking pressure of each wheel by using the hydraulic pressure of a master cylinder driven by a motor after the driver's pedal pressure is detected by a sensor.

[0003] Electro-hydraulic braking systems include sensors that detect the pedal travel distance to determine the braking pressure required by the driver.

[0004] In addition, the electro-hydraulic braking system includes a pedal travel simulator, which allows the driver to experience the same pedal pressure as a conventional hydraulic braking system.

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

[0006] In addition, the master cylinder transmits brake hydraulic pressure to the wheel cylinders of each wheel to provide braking force to each wheel.

[0007] Traditional electro-hydraulic braking systems cannot quickly provide braking hydraulic pressure to the wheel cylinders when the motor fails, leading to accidents. Therefore, it is necessary to improve upon these issues.

[0008] The related technology disclosed herein is disclosed in Korean Patent Application No. 2007-0104982 (published on October 30, 2007, entitled "Control Device for a Valve in an Electro-hydraulic Braking System"). Summary of the Invention

[0009] This disclosure has been designed to improve the above-mentioned problems, and the purpose of this disclosure is to provide an electro-hydraulic braking device that can quickly execute auxiliary braking when a main braking error occurs, clearly distinguish the hydraulic circuits of each function, diversify the set pressure control routes, and improve bridging quality.

[0010] An electro-hydraulic braking device according to the present disclosure includes: a main braking unit that supplies brake fluid to a plurality of wheel cylinders via a drive motor; a storage unit connected to the main braking unit and configured to store brake fluid; and an auxiliary braking unit connected to the main braking unit and the storage unit and supplying brake fluid to some of the wheel cylinder units in the event of an operational error of the main braking unit, wherein the hydraulic circuit is physically separated in the auxiliary braking unit.

[0011] The main braking unit may include: a pedal cylinder unit that generates hydraulic pressure when the driver depresses or presses the vehicle's pedal; a master cylinder unit that detects the driver's depressing of the pedal and generates hydraulic pressure via a drive motor; a first main hydraulic unit that is connected to the master cylinder unit and directs brake fluid to some of the multiple wheel cylinder units; a second main hydraulic unit that connects the master cylinder unit to the auxiliary braking unit and directs brake fluid to the remaining wheel cylinder units; and a third main hydraulic unit that connects the first main hydraulic unit to the second main hydraulic unit or disconnects the first main hydraulic unit from the second main hydraulic unit.

[0012] The first master hydraulic unit can guide brake fluid to the wheel cylinder unit located on the rear wheel, and the second master hydraulic unit can guide brake fluid to the wheel cylinder unit located on the front wheel.

[0013] The primary hydraulic unit and the auxiliary braking unit can be connected to allow the movement of brake fluid.

[0014] The auxiliary braking unit may include: a first auxiliary flow path unit configured to control brake fluid after connecting a second main hydraulic unit and a wheel cylinder unit; a second auxiliary flow path unit configured to control brake fluid after connecting a first auxiliary flow path unit and an electric pump unit; and a third auxiliary flow path unit configured to control brake fluid after connecting an electric pump unit and a first auxiliary flow path unit.

[0015] The first auxiliary flow path unit may include: a first flow path pipeline unit that connects the second main hydraulic unit and the wheel cylinder unit to guide brake fluid; and a first flow path valve unit that is formed in the first flow path pipeline unit and opens or closes the first flow path pipeline unit.

[0016] The second auxiliary flow path unit may include: a second flow path pipeline unit that connects the first auxiliary flow path unit and the electric pump unit; and a second flow path valve unit that is formed in the second flow path pipeline unit and opens or closes the second flow path pipeline unit.

[0017] The second auxiliary flow path unit may also include a second flow path connection unit, which connects the second flow path pipeline unit and the storage unit.

[0018] The third auxiliary flow path unit may include: a third flow path pipeline unit that connects the electric pump unit and the first auxiliary flow path unit to guide brake fluid; and a third flow path valve unit that is formed in the third flow path pipeline unit and opens or closes the third flow path pipeline unit.

[0019] The third flow path valve unit can open the third flow path pipeline unit, allowing brake fluid discharged from the electric pump unit to be supplied to the wheel cylinder unit.

[0020] The auxiliary braking unit may include a fourth auxiliary flow path unit, which is configured to control the brake fluid after connecting the third auxiliary flow path unit and the storage unit.

[0021] The fourth auxiliary flow path unit may include: a fourth flow path pipeline unit that connects the third auxiliary flow path unit and the storage unit to guide brake fluid; and a fourth flow path valve unit that is formed in the fourth flow path pipeline unit and opens or closes the fourth flow path pipeline unit.

[0022] In the electro-hydraulic braking device according to this disclosure, the main braking unit and the auxiliary braking unit are connected by a hydraulic circuit, and the auxiliary braking unit can be driven to perform braking when an operational error occurs in the main braking unit.

[0023] In an electro-hydraulic braking device according to one embodiment of the present disclosure, a first auxiliary flow path unit can control the brake fluid after connecting the main flow path unit and the wheel cylinder unit, a second auxiliary flow path unit can control the brake fluid after connecting the first auxiliary flow path unit and the electric pump unit, and a third auxiliary flow path unit can control the brake fluid after connecting the electric pump unit and the first auxiliary flow path unit. Therefore, the hydraulic circuit can be physically divided according to function.

[0024] In an electro-hydraulic braking device according to one embodiment of the present disclosure, a second auxiliary flow path unit is connected to a storage unit, and the valve resistance to the brake fluid supplied to the electric pump unit is eliminated, thereby improving the bridging quality. Attached Figure Description

[0025] Figure 1 This is a schematic block diagram illustrating an electro-hydraulic braking device according to one embodiment of the present disclosure.

[0026] Figure 2 This is a schematic view of an electro-hydraulic braking device according to one embodiment of the present disclosure.

[0027] Figure 3 This is a schematic view of an auxiliary braking unit according to one embodiment of the present disclosure.

[0028] Figure 4This is a schematic view showing the normal operating state of the main braking unit in an electro-hydraulic braking device according to one embodiment of the present disclosure.

[0029] Figure 5 This is a schematic view showing the two-wheel pressurization state of an auxiliary braking unit including an electric pump unit according to a first embodiment of the present disclosure.

[0030] Figure 6 This is a schematic view showing the two-wheel pressurization state of the auxiliary braking unit including the electric pump unit according to the second embodiment of this disclosure.

[0031] Figure 7 This is a schematic view showing the single-wheel decompression state of an auxiliary braking unit according to one embodiment of the present disclosure.

[0032] Figure 8 This is a schematic view showing the decompression state of the two wheels of an auxiliary braking unit according to one embodiment of the present disclosure.

[0033] Figure 9 This is a schematic view showing the single-wheel boosting state of an auxiliary braking unit according to one embodiment of the present disclosure.

[0034] Figure 10 This is a view schematically illustrating the hydraulic control state of the auxiliary braking unit according to a first embodiment of the present disclosure.

[0035] Figure 11 This is a view schematically illustrating the hydraulic control state of the auxiliary braking unit according to the second embodiment of this disclosure.

[0036] Figure 12 This is a schematic view showing the hydraulic control state of the auxiliary braking unit according to the third embodiment of the present disclosure. Detailed Implementation

[0037] In the following description, the electro-hydraulic braking device will be illustrated with reference to the accompanying drawings through various exemplary embodiments. For clarity and convenience, the thickness of lines, the dimensions of component elements, etc., may be shown in an exaggerated manner in the drawings. Furthermore, the terminology described below is defined by consideration of its function according to this disclosure and may vary according to the intent of the user or administrator or according to convention in the art. Therefore, these terms should be defined in accordance with the details disclosed throughout this specification.

[0038] Figure 1 This is a schematic block diagram illustrating an electro-hydraulic braking device according to one embodiment of the present disclosure. (Refer to...) Figure 1 An electro-hydraulic braking device according to one embodiment of the present disclosure includes a main braking unit 1, a storage unit 2, and an auxiliary braking unit 3.

[0039] The main braking unit 1 supplies brake fluid to multiple wheel cylinder units 4 via a drive motor. A storage unit 2 is connected to the main braking unit 1 and temporarily stores brake fluid. An auxiliary braking unit 3 is connected to both the main braking unit 1 and the storage unit 2. When the main braking unit 1 malfunctions, the auxiliary braking unit 3 supplies brake fluid to some of the wheel cylinder units 4. The auxiliary braking unit 3 is designed to physically divide the hydraulic circuit according to its function.

[0040] In other words, when an operational error occurs in the main braking unit 1 of an electric vehicle, hybrid vehicle, or autonomous vehicle's electronic braking system, the electro-hydraulic braking system according to this disclosure can perform emergency braking by activating the auxiliary braking unit 3. In this case, the operational error of the main braking unit 1 may be an operational error of various valves used to control the hydraulic circuit or a motor drive error.

[0041] Figure 2 This is a schematic view illustrating an electro-hydraulic braking device according to one embodiment of the present disclosure. (Refer to...) Figure 2 According to the embodiments of the present disclosure, the main braking unit 1 includes a pedal cylinder unit 110, a master cylinder unit 120, a first main hydraulic unit 130, a second main hydraulic unit 140, and a third main hydraulic unit 150.

[0042] The pedal cylinder unit 110 generates hydraulic pressure by pressing the pedal 119. The pedal cylinder unit 110 may form two chambers and may provide pedal force corresponding to the increased pressure of the pedal 119.

[0043] The master cylinder unit 120 detects whether the pedal 119 is operated and generates hydraulic pressure via the drive motor 129. The master cylinder unit 120 may form a chamber, and the motor 129 may be driven in a forward or backward direction depending on the pressurization state of the pedal 119. The master cylinder unit 120 may be connected to the pedal cylinder unit 110 via the cylinder line unit 128.

[0044] The first main hydraulic unit 130 is connected to the master cylinder unit 120 and directs brake fluid to some of the multiple wheel cylinder units 4.

[0045] More specifically, the first master hydraulic unit 130 may include: a 1-1 hydraulic line unit 131 connected to the master cylinder unit 120 to guide brake fluid; and a 1-2 hydraulic line unit 132 connected to the 1-1 hydraulic line unit 131 and branching to the first wheel cylinder unit 5 to guide brake fluid to the first wheel cylinder unit 5. In this case, the two first wheel cylinder units 5 may each be located on one rear wheel.

[0046] The second main hydraulic unit 140 connects the master cylinder unit 120 and the auxiliary braking unit 3, and guides the braking hydraulic pressure to the remaining wheel cylinder units in the plurality of wheel cylinder units 4.

[0047] More specifically, the second main hydraulic unit 140 may include: a 2-1 hydraulic line unit 141 connected to the master cylinder unit 120 to guide brake hydraulic pressure; and a 2-2 hydraulic line unit 142 connected to the 2-1 hydraulic line unit 141 and branching to the auxiliary braking unit 3 to guide brake fluid to the auxiliary braking unit 3. In this case, the auxiliary braking unit 3 may be connected to the second wheel cylinder units 6, and the two second wheel cylinder units 6 may each be located at one front wheel, and may include a first wheel unit 6a and a second wheel unit 6b.

[0048] Meanwhile, in the vehicle driving method, the first wheel cylinder unit 5 can be located at the front wheel, the second wheel cylinder unit 6 can be located at the rear wheel, and the auxiliary braking unit 3 can be connected to the drive wheel.

[0049] The third main hydraulic unit 150 connects the first main hydraulic unit 130 to the second main hydraulic unit 140, or disconnects the first main hydraulic unit 130 from the second main hydraulic unit 140. For example, the third main hydraulic unit 150 may connect the 1-2 hydraulic line unit 132 and the 2-2 hydraulic line unit 142.

[0050] Figure 3 This is a schematic view illustrating an auxiliary braking unit according to one embodiment of the present disclosure. (Refer to...) Figure 2 and Figure 3 According to the embodiments of the present disclosure, the auxiliary braking unit 3 includes a first auxiliary flow path unit 10, a second auxiliary flow path unit 20 and a third auxiliary flow path unit 30.

[0051] The first auxiliary flow path unit 10 connects to the second main hydraulic unit 140 and the wheel cylinder unit 4 to control the flow of brake fluid. For example, the two first auxiliary flow path units 10 can each be connected to one of the branch 2-2 hydraulic line units 142. The first auxiliary flow path unit 10 can allow or block brake fluid and can control the set pressure of the brake fluid as needed.

[0052] The second auxiliary flow path unit 20 controls the brake fluid after connecting the first auxiliary flow path unit 10 and the electric pump unit 90. For example, one end of the second auxiliary flow path unit 20 can be connected to each of the first auxiliary flow path units 10, and the other end of the second auxiliary flow path unit 20 can be connected to the electric pump unit 90. The second auxiliary flow path unit 20 can be connected to the storage unit 2. Meanwhile, the electric pump unit 90 is a device that forcibly supplies brake fluid when energized and is driven to supply brake fluid in the event of a malfunction in the main braking unit 1.

[0053] The third auxiliary flow path unit 30 controls the brake fluid after connecting the electric pump unit 90 and the first auxiliary flow path unit 10. For example, the third auxiliary flow path unit 30 may be connected to the electric pump unit 90 and branch off, or it may be connected to the electric pump unit 90 and guide the brake fluid discharged from the electric pump unit 90 to the first auxiliary flow path unit 10.

[0054] More specifically, the first auxiliary flow path unit 10 includes a first flow path pipeline unit 11 and a first flow path valve unit 12.

[0055] The first flow path pipeline unit 11 connects the second main hydraulic unit 140 and the wheel cylinder unit 4 to guide the brake fluid. For example, one end of the first flow path pipeline unit 11 can be connected to each of the 2-2 hydraulic pipeline units 142, while the other end can be connected to the second wheel cylinder unit 6.

[0056] The first flow path valve unit 12 is formed within the first flow path pipeline unit 11 and opens or closes the first flow path pipeline unit 11. For example, the first flow path valve unit 12 can allow brake fluid to pass through or block brake fluid, and can control the set pressure of the brake fluid as needed. The first flow path valve unit 12 can be disposed within the first flow path pipeline unit 11, forming between the connection point of the second main hydraulic unit 140 and the first flow path pipeline unit 11, the second auxiliary flow path unit 20, and the third auxiliary flow path unit 30.

[0057] The second auxiliary flow path unit 20 includes a second flow path pipeline unit 21 and a second flow path valve unit 22.

[0058] The second flow path pipeline unit 21 connects the first auxiliary flow path unit 10 and the electric pump unit 90 to guide the brake fluid. In addition, a second flow path valve unit 22 is formed in the second flow path pipeline unit 21 to open or close the second flow path pipeline unit 21.

[0059] For example, one end of the second flow path pipeline unit 21 can be connected to the first flow path pipeline unit 11, and the other end of the second flow path pipeline unit 21 can be connected to the electric pump unit 90. Furthermore, a second flow path valve unit 22 can be disposed within the second flow path pipeline unit 21, formed between the connection point of the electric pump unit 90 and the first flow path pipeline unit 11 and the second flow path pipeline unit 21. A pair of second flow path pipeline units 21 can be connected to each other and can be connected to the electric pump unit 90 via a single pipeline or a separate pipeline.

[0060] The second auxiliary flow path unit 20 may further include a second flow path connection unit 23. The second flow path connection unit 23 connects the second flow path pipeline unit 21 and the storage unit 2. For example, the second flow path connection unit 23 may be connected to the second flow path pipeline unit 21 formed between the second flow path valve unit 22 and the electric pump unit 90. Therefore, since the brake fluid supplied from the storage unit 2 can be supplied to the electric pump unit 90 without passing through a separate valve, the bridging quality can be improved.

[0061] The third auxiliary flow path unit 30 includes a third flow path pipeline unit 31 and a third flow path valve unit 32.

[0062] The third flow path pipeline unit 31 connects the electric pump unit 90 and the first auxiliary flow path unit 10 to guide the brake fluid. Then, a third flow path valve unit 32 is formed in the third flow path pipeline unit 31 to open or close the third flow path pipeline unit 31.

[0063] For example, since a pair of third flow path pipeline units 31 are connected to each other to guide brake fluid to the first flow path pipeline unit 11, they can share the electric pump unit 90. The third flow path pipeline unit 31 can be connected to the electric pump unit 90 via a single pipeline or a separate pipeline. A third flow path valve unit 32 can be disposed in the third flow path pipeline unit 31, formed between the connection point of the electric pump unit 90 and the third flow path pipeline unit 31 and the first flow path pipeline unit 11.

[0064] Simultaneously, the third flow path valve unit 32 opens the third flow path pipeline unit 31, allowing brake fluid discharged from the electric pump unit 90 to be supplied to the wheel cylinder unit 4. In this situation, the second flow path valve unit 22 can close the second flow path pipeline unit 21.

[0065] The auxiliary braking unit 3 according to an embodiment of the present disclosure may further include a fourth auxiliary flow path unit 40. The fourth auxiliary flow path unit 40 controls the brake fluid after connecting the third auxiliary flow path unit 30 and the storage unit 2. For example, the fourth auxiliary flow path unit 40 can allow or block the flow of brake fluid, and can control the set pressure of the brake fluid as needed.

[0066] More specifically, the fourth auxiliary flow path unit 40 includes a fourth flow path pipeline unit 41 and a fourth flow path valve unit 42.

[0067] The fourth flow path pipeline unit 41 connects the third auxiliary flow path unit 30 and the storage unit 2 to guide the brake fluid. Then, a fourth flow path valve unit 42 is formed in the fourth flow path pipeline unit 41 to open or close the fourth flow path pipeline unit 41. The fourth flow path valve unit 42 can allow or block brake fluid flow and can control the set pressure of the brake fluid as needed.

[0068] For example, one end of the fourth flow path pipeline unit 41 can be connected to the third flow path pipeline unit 31, and the other end of the fourth flow path pipeline unit 41 can be directly connected to the storage unit 2 or connected to the second flow path connection unit 23 connected to the storage unit 2. More specifically, the fourth flow path pipeline unit 41 can be connected to the third flow path pipeline unit 31 formed between the electric pump unit 90 and the third flow path valve unit 32.

[0069] Meanwhile, when the fourth flow path pipeline unit 41 is directly connected to the storage unit 2, the second flow path connection unit 23 can be connected to the fourth flow path pipeline unit 41. In this case, the fourth flow path valve unit 42 can be provided in the fourth flow path pipeline unit 41, which is formed between the connection point of the third flow path pipeline unit 31 and the fourth flow path pipeline unit 41 and the second flow path connection unit 23.

[0070] Figure 4 This is a schematic view illustrating the normal operating state of the main braking unit in an electro-hydraulic braking device according to one embodiment of the present disclosure. (Refer to...) Figure 4 When the master brake unit 1 is in normal operation and the pedal 119 is pressurized or braking is required via the automatic drive system, the motor 129 of the master cylinder unit 120 is driven. Therefore, the hydraulic pressure generated by the master cylinder unit 120 increases, and brake fluid is supplied to the first master hydraulic unit 130 and the second master hydraulic unit 140.

[0071] Brake fluid from the first main hydraulic unit 130 is supplied to the first wheel cylinder unit 5 to perform rear wheel braking. Then, brake fluid from the second main hydraulic unit 140 passes through the auxiliary braking unit 3 and is supplied to the second wheel cylinder unit 6 to perform front wheel braking.

[0072] In the auxiliary braking unit 3, the first flow path valve unit 12 opens the first flow path pipeline unit 11, the second flow path valve unit 22 closes the second flow path pipeline unit 21, and the third flow path valve unit 32 closes the third flow path pipeline unit 31. In this case, the fourth flow path valve unit 42 can open the fourth flow path pipeline unit 41.

[0073] Figure 5 This is a schematic view illustrating the two-wheel pressurization state of the auxiliary braking unit including the electric pump unit according to a first embodiment of the present disclosure. (Refer to...) Figure 5 When the main braking unit 1 is in an abnormal operating state, the first flow path valve unit 12 closes the first flow path pipeline unit 11, the second flow path valve unit 22 closes the second flow path pipeline unit 21, and the third flow path valve unit 32 opens the third flow path pipeline unit 31. Then, the fourth flow path valve unit 42 can close the fourth flow path pipeline unit 41 or control the set pressure.

[0074] When one of the pumps in the electric pump unit 90 is driven in the above-described state, the brake fluid discharged from the electric pump unit 90 is branched through the third flow path pipeline unit 31 and supplied to each of the second wheel cylinder units 6, thereby performing front wheel braking. In this case, the brake fluid stored in the storage unit 2 through the second flow path connection unit 23 can be supplied to the electric pump unit 90 without passing through the valve of the electric pump unit 90.

[0075] Figure 6 This is a schematic view illustrating the two-wheel pressurization state of the auxiliary braking unit including the electric pump unit according to the second embodiment of this disclosure. (Refer to...) Figure 6 When the main braking unit 1 is in an abnormal operating state, the first flow path valve unit 12 closes the first flow path pipeline unit 11, the second flow path valve unit 22 closes the second flow path pipeline unit 21, and the third flow path valve unit 32 opens the third flow path pipeline unit 31. Furthermore, the fourth flow path valve unit 42 can close the fourth flow path pipeline unit 41 or control the set pressure.

[0076] When the three pumps in the electric pump unit 90 are driven in the above-described state, the brake fluid discharged from the electric pump unit 90 is supplied to the second wheel cylinder unit 6 through the third flow path pipeline unit 31, thereby performing front wheel braking. In this case, the brake fluid stored in the storage unit 2 through the second flow path connection unit 23 can be supplied to the electric pump unit 90.

[0077] Figure 7 This is a schematic view illustrating a single-wheel decompression state of an auxiliary braking unit according to one embodiment of the present disclosure, which may be a single-wheel decompression state of an anti-lock braking system (ABS). (Refer to...) Figure 7 When the main braking unit 1 is in an abnormal operating state, the first flow path valve unit 12 closes the first flow path pipeline unit 11. Then, the second flow path valve unit 22, formed in the second flow path pipeline unit 21 connected to the first wheel unit 6a to be depressurized, opens the second flow path pipeline unit 21. On the other hand, the second flow path valve unit 22, formed in the second flow path pipeline unit 21 connected to the second wheel unit 6b without depressurization, closes the second flow path pipeline unit 21.

[0078] In this situation, the third flow path valve unit 32, formed in the third flow path pipeline unit 31 connected to the first flow path unit 6a to be depressurized, closes the third flow path pipeline unit 31. On the other hand, the third flow path valve unit 32, formed in the third flow path pipeline unit connected to the second flow path unit 6b not to be depressurized, opens the third flow path pipeline unit 31. At the same time, the fourth flow path valve unit 42 can close the fourth flow path pipeline unit 41 or control the set pressure.

[0079] In the above state, the brake fluid supplied to the first wheel unit 6a to be depressurized moves sequentially to the storage unit 2 through the first flow path pipeline unit 11, the second flow path pipeline unit 21, and the second flow path connection unit 23.

[0080] Figure 8 This is a schematic view illustrating the two-wheel decompression state of an auxiliary braking unit according to one embodiment of the present disclosure, which may be the ABS two-wheel decompression state. (Refer to...) Figure 8 When the main braking unit 1 is in an abnormal operating state, the first flow path valve unit 12 closes the first flow path pipeline unit 11, and the second flow path valve unit 22 opens the second flow path pipeline unit 21. In this case, the third flow path valve unit 32, formed in the third flow path pipeline unit 31 connected to the second wheel cylinder unit 6 to be depressurized, closes the third flow path pipeline unit 31. At the same time, the fourth flow path valve unit 42 can close the fourth flow path pipeline unit 41 or control the set pressure.

[0081] In the above state, the operation of the electric pump unit 90 stops, and the brake fluid supplied to the second wheel cylinder unit 6 to be depressurized moves sequentially through the first flow path pipeline unit 11, the second flow path pipeline unit 21, and the second flow path connection unit 23 to the storage unit 2, thereby performing two-wheel depressurization.

[0082] Figure 9 This is a schematic view illustrating a single-wheel boost state of an auxiliary braking unit according to one embodiment of the present disclosure, which may be a vehicle dynamics control (VDC) single-wheel boost state. (Refer to...) Figure 9 The first flow path valve unit 12, formed in the first flow path pipeline unit 11 connected to the second flow path unit 6b to be pressurized, closes the first flow path pipeline unit 11. On the other hand, the first flow path valve unit 12, formed in the first flow path pipeline unit 11 connected to the first flow path unit 6a without pressurization, opens the first flow path pipeline unit 11.

[0083] Furthermore, the second flow path valve unit 22, formed in the second flow path pipeline unit 21 connected to the second flow path unit 6b to be pressurized, closes the second flow path pipeline unit 21. On the other hand, the second flow path valve unit 22, formed in the second flow path pipeline unit 21 connected to the first flow path unit 6a without pressurization, opens the second flow path pipeline unit 21.

[0084] In this situation, the third flow path valve unit 32, formed in the third flow path pipeline unit 31 connected to the second flow path unit 6b to be pressurized, opens the third flow path pipeline unit 31. On the other hand, the third flow path valve unit 32, formed in the third flow path pipeline unit connected to the first flow path unit 6a without pressurization, closes the third flow path pipeline unit 31. At the same time, the fourth flow path valve unit 42 can close the fourth flow path pipeline unit 41 or control the set pressure.

[0085] When the electric pump unit 90 is driven in the above state, the brake fluid discharged from the electric pump unit 90 is supplied to the second wheel unit 6b to be pressurized through the third flow path pipeline unit 31, thereby performing braking.

[0086] Figure 10 This is a schematic view illustrating the hydraulic control state of the auxiliary braking unit according to the first embodiment of this disclosure. Because the pedal 119 has been removed or an electric pedal is used, control interference with the auxiliary braking unit 3 does not occur even when the driver intervenes. (See also...) Figure 10 The first flow path valve unit 12 can control the set pressure of the brake fluid. In this case, the fourth auxiliary flow path unit 40 in the hydraulic circuit can be omitted.

[0087] Figure 11 This is a schematic view showing the hydraulic control state of the auxiliary braking unit according to the second embodiment of the present disclosure. Figure 12 This is a schematic view illustrating the hydraulic control state of the auxiliary braking unit 3 according to the third embodiment of this disclosure, and showing that when the driver intervenes and depresses pedal 119, the hydraulic circuit minimizes control disturbances to the auxiliary braking unit 3. (Refer to...) Figure 11 The first flow path valve unit 12 can control the set pressure of the brake fluid, and the fourth flow path valve unit 42 can also control the set pressure of the brake fluid. Meanwhile, referring to... Figure 12 The first flow path valve unit 12 can control only the opening / closing (ON / OFF) of the first flow path pipeline unit 11, and only the fourth flow path valve unit 42 can control the set pressure of the brake fluid.

[0088] In the electro-hydraulic braking device according to the embodiments of the present disclosure, the main braking unit 1 and the auxiliary braking unit 3 can be connected to each other through a hydraulic circuit, and when an operational error occurs in the main braking unit 1, the auxiliary braking unit 3 can be driven to perform braking.

[0089] In the electro-hydraulic braking device according to the embodiments of the present disclosure, the first auxiliary flow path unit 10 can control the flow of brake fluid after connecting the main braking unit 1 and the wheel cylinder unit 4, the second auxiliary flow path unit 20 can control the flow of brake fluid after connecting the first auxiliary flow path unit 10 and the electric pump unit 90, and the third auxiliary flow path unit 30 controls the brake fluid after connecting the electric pump unit 90 and the first auxiliary flow path unit 10. Therefore, the hydraulic circuit can be physically divided according to function.

[0090] In the electro-hydraulic braking device according to an embodiment of the present disclosure, the second auxiliary flow path unit 20 is connected to the storage unit 2, and the valve resistance to the brake fluid supplied to the electric pump unit 90 is omitted, thereby improving the bridging quality.

[0091] Although exemplary embodiments of the present disclosure have been described for illustrative purposes, those skilled in the art will understand that various modifications, additions, and substitutions may be made without departing from the scope and spirit of the disclosure as defined by the appended claims.

Claims

1. An electro-hydraulic braking device, the electro-hydraulic braking device comprising: A main braking unit, configured to supply brake fluid to multiple wheel cylinder units of the vehicle; A storage unit connected to the main braking unit and configured to store the brake fluid; as well as An auxiliary braking unit, connected to the main braking unit and the storage unit, is configured to supply brake fluid to at least some of the plurality of wheel cylinder units in the event of an operational error at the main braking unit, wherein the hydraulic circuit is physically divided in the auxiliary braking unit. The main braking unit includes: A pedal cylinder unit configured to generate a first hydraulic pressure when the driver depresses the pedal of the vehicle; A master cylinder unit, configured to detect the driver's pressing of the pedal and generate a second hydraulic pressure; A first master hydraulic unit is connected to the master cylinder unit and is configured to direct the brake fluid to one or more of the plurality of wheel cylinder units. A second main hydraulic unit, which connects the master cylinder unit to the auxiliary braking unit and is configured to direct the brake fluid to one or more of the plurality of wheel cylinder units; and A third main hydraulic unit is configured to connect the first main hydraulic unit to the second main hydraulic unit or disconnect the first main hydraulic unit from the second main hydraulic unit. The auxiliary braking unit includes: A first auxiliary flow path unit extends between the second main hydraulic unit and the wheel cylinder unit, and the first auxiliary flow path unit is configured to control the flow of brake fluid from the second main hydraulic unit to the wheel cylinder unit; A second auxiliary flow path unit extends between the first auxiliary flow path unit and the electric pump unit, and the second auxiliary flow path unit is configured to control the flow of brake fluid from the first auxiliary flow path unit to the electric pump unit; and A third auxiliary flow path unit extends between the electric pump unit and the first auxiliary flow path unit, and the third auxiliary flow path unit is configured to control the flow of brake fluid from the electric pump unit to the first auxiliary flow path unit.

2. The electro-hydraulic braking device according to claim 1, wherein: The one or more first wheel cylinder units include wheel cylinder units disposed at the rear wheels of the vehicle, and The one or more second wheel cylinder units include wheel cylinder units disposed at the front wheels of the vehicle.

3. The electro-hydraulic braking device according to claim 1, wherein, The first main hydraulic unit and the auxiliary braking unit are connected to allow the brake fluid to flow between the first main hydraulic unit and the auxiliary braking unit.

4. The electro-hydraulic braking device according to claim 1, wherein, The first auxiliary flow path unit includes: A first flow path pipeline unit, the first flow path pipeline unit connecting the second main hydraulic unit and the wheel cylinder unit; and A first flow path valve unit is disposed at the first flow path pipeline unit and configured to open or close the first flow path pipeline unit.

5. The electro-hydraulic braking device according to claim 1, wherein, The second auxiliary flow path unit includes: A second flow path pipeline unit, the second flow path pipeline unit connecting the first auxiliary flow path unit and the electric pump unit; and A second flow path valve unit is disposed at the second flow path pipeline unit and configured to open or close the second flow path pipeline unit.

6. The electro-hydraulic braking device according to claim 5, wherein, The second auxiliary flow path unit further includes a second flow path connection unit that connects the second flow path pipeline unit and the storage unit.

7. The electro-hydraulic braking device according to claim 1, wherein, The third auxiliary flow path unit includes: A third flow path pipeline unit, wherein the third flow path pipeline unit connects the electric pump unit and the first auxiliary flow path unit; and A third flow path valve unit is disposed at the third flow path pipeline unit and configured to open or close the third flow path pipeline unit.

8. The electro-hydraulic braking device according to claim 7, wherein, When the third flow path valve unit opens the third flow path pipeline unit, the brake fluid discharged from the electric pump unit is supplied to the wheel cylinder unit.

9. The electro-hydraulic braking device according to claim 1, wherein, The auxiliary braking unit further includes a fourth auxiliary flow path unit, which is configured to control the flow of brake fluid from the third auxiliary flow path unit to the storage unit.

10. The electro-hydraulic braking device according to claim 9, wherein, The fourth auxiliary flow path unit includes: A fourth flow path pipeline unit, wherein the fourth flow path pipeline unit connects the third auxiliary flow path unit and the storage unit; and A fourth flow path valve unit is disposed at the fourth flow path pipeline unit and configured to open or close the fourth flow path pipeline unit.

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