Electronic hydraulic brake device

Abstract

Electronic hydraulic braking device which features: a main brake part (1) comprising a first hydraulic part (130, 230) and a second hydraulic part (140, 240) configured to drive a motor (129, 229) for supplying hydraulic pressure to a plurality of wheel cylinders (3); and a support brake part (2) which is connected to one or more of the first and second hydraulic parts (130, 140, 230, 240) to be filled with high hydraulic brake pressure, and which is designed to provide hydraulic brake pressure for the plurality of wheel cylinders (3) when an operational fault of the main brake part (1) occurs, wherein the support brake part (2) comprises: a support hydraulic part which is connected to one of the first and second hydraulic parts (130, 140, 230, 240) and which is designed to carry hydraulic brake pressure; a support accumulator (20, 70) connected to the support hydraulic part (10) and filled with high hydraulic brake pressure; a support bypass section (30) designed to bypass the support hydraulic section in order to direct hydraulic brake pressure to the support accumulator (20, 70); and a support sensor part (40, 90) designed to measure the hydraulic brake pressure of the support accumulator (20, 70), characterized by the fact that the hydraulic brake pressure generated by the main brake part (1) by driving the motor (129, 229) is moved to the support accumulator (20, 70) to fill the support accumulator (20, 70).

Description

1. Technical area

[0001] Embodiments relate to an electronic hydraulic braking device, and more particularly to an electronic hydraulic braking device capable of quickly performing auxiliary braking when a main braking failure occurs in an integrated or separate braking system. 2. State of the art

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

[0003] The electronic hydraulic brake device has a sensor for sensing a pedal stroke so that a driver can detect a desired brake pressure.

[0004] The electronic hydraulic brake device further includes a pedal travel simulator that enables a driver to feel the same pedal pressure as in a known hydraulic brake device.

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

[0006] The master cylinder transmits hydraulic brake pressure to a wheel cylinder of each wheel to provide braking force to that wheel.

[0007] The current electronic hydraulic brake device cannot quickly provide hydraulic braking pressure to the wheel cylinder when the motor is damaged, thus causing an accident. Therefore, there is a need for a device that can solve this problem.

[0008] The prior art to the disclosure is described in Korean Patent Application Laid-Open No. 2007-0104982, published on October 30, 2007, entitled "Valve Control Device of Electronic Hydraulic Brake Device." US 2017 / 0001614 A1 discloses an electronic hydraulic brake device having the features of the preamble of claim 1. OVERVIEW

[0009] Various embodiments relate to a hydraulic braking device that can quickly perform auxiliary braking when a main braking failure occurs in an integrated or separate braking system. The invention is defined by the features of claim 1.

[0010] According to the invention, an electronic hydraulic brake device comprises: a main brake part having a first hydraulic part and a second hydraulic part configured therein to drive a motor for supplying hydraulic pressure to a plurality of wheel cylinders; and a backup brake part connected to one or more of the first and second hydraulic parts to be filled with high hydraulic braking pressure, and configured to provide hydraulic braking pressure to the plurality of wheel cylinders when an operational failure of the main brake part occurs.

[0011] The main brake part includes: a pedal cylinder configured to generate hydraulic pressure when a pedal is depressed, and connected to the first hydraulic part to supply hydraulic braking pressure to some of the plurality of wheel cylinders, and connected to the second hydraulic part to supply hydraulic braking pressure to the others of the plurality of wheel cylinders; and a hydraulic port configured to connect or disconnect the first and second hydraulic parts.

[0012] The main brake part includes: a master cylinder configured to drive the motor to generate hydraulic pressure, and connected to the first hydraulic part to supply hydraulic braking pressure to some of the plurality of wheel cylinders, and connected to the second hydraulic part to supply hydraulic braking pressure to the others of the plurality of wheel cylinders; and a main motor pump mounted in the first and second hydraulic parts and configured to boost the hydraulic braking pressure of the first and second hydraulic parts.

[0013] According to the invention, the assist brake part comprises: an assist hydraulic part connected to one of the first and second hydraulic parts and configured to supply hydraulic braking pressure; an assist accumulator connected to the assist hydraulic part and filled with high hydraulic braking pressure; an assist bypass part configured to bypass the assist hydraulic part to supply hydraulic braking pressure to the assist accumulator; and an assist sensing part configured to measure the hydraulic braking pressure of the assist accumulator.

[0014] According to the invention, the hydraulic braking pressure generated by the main braking part by driving the motor is moved to the assist accumulator to fill the assist accumulator.

[0015] The assist hydraulic part includes: an assist hydraulic line having one end connected to one of the first and second hydraulic parts, and the other end connected to the assist accumulator; and an assist hydraulic valve formed on the assist hydraulic line and configured to open the assist hydraulic line when an operation failure of the main brake part occurs.

[0016] The assist bypass part includes: an assist bypass line having both ends connected to the assist hydraulic line and configured to cause brake hydraulic pressure to bypass the assist hydraulic valve and be moved to the assist accumulator; and an assist bypass valve configured on the assist bypass line and configured to allow brake hydraulic pressure to be moved in one direction.

[0017] The assist brake part may further include an assist pump connected to a storage part connected to the main brake part for storing hydraulic brake pressure, and configured to transmit the hydraulic brake pressure stored in the storage part to the assist accumulator.

[0018] The assist brake part comprises: a first assist hydraulic part connected to the first hydraulic part and configured to supply hydraulic braking pressure; a second assist hydraulic part connected to the second hydraulic part and configured to supply hydraulic braking pressure; an assist accumulator connected to the first and second assist hydraulic parts and filled with high hydraulic braking pressure; a first assist bypass part configured to bypass the first assist hydraulic part to supply hydraulic braking pressure to the assist accumulator; a second assist bypass part configured to bypass the second assist hydraulic part to supply hydraulic braking pressure to the assist accumulator.and an assist sensing part configured to measure the hydraulic braking pressure of the assist accumulator;

[0019] In the electronic hydraulic brake device according to the embodiment of the disclosure, the main brake part and the auxiliary brake part may be connected as a hydraulic pressure circuit for moving hydraulic pressure, and high hydraulic brake pressure stored in the auxiliary brake part may be moved to the main brake part and supplied to the wheel cylinder when an operation failure of the main brake part occurs.

[0020] Furthermore, the assist pump forcibly moves the brake fluid stored in the reservoir to a assist accumulator. Therefore, when an operational failure of the main brake unit occurs, hydraulic brake pressure can be continuously supplied to the assist accumulator to perform vehicle braking. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of an electronic hydraulic brake device according to an embodiment of the disclosure. Fig. 2 is a schematic diagram of a main brake part according to a first embodiment of the disclosure. Fig. 3 is a schematic representation of a first embodiment of a brake system connected to the main brake part of Fig. 2 connected support brake part. Fig. Figure 4 is a schematic representation of a hydraulic pressure curve whereby an assist accumulator with a high hydraulic brake pressure in Fig. 3 is filled. Fig. 5 is a schematic representation of a hydraulic pressure curve whereby the high hydraulic brake pressure stored in the assist accumulator is supplied to a wheel cylinder in Fig. 3 is supplied. Fig. 6 is a schematic representation of a brake system associated with the assist brake part of Fig. 2 added support pump. Fig. 7 is a schematic representation of a second embodiment of the brake system connected to the main brake part of Fig. 2 connected support brake part. Fig. 8 is a schematic diagram of a main brake part according to a second embodiment of the disclosure. Fig. 9 is a schematic representation of a first embodiment of a brake system connected to the main brake part of Fig. 8 connected support brake part. Fig. 10 is a schematic representation of a hydraulic pressure curve, whereby the assist accumulator is supplied with a high hydraulic brake pressure in Fig. 9 is filled. Fig. 11 is a schematic diagram of a hydraulic pressure curve whereby the high hydraulic brake pressure stored in the assist accumulator is supplied to a wheel cylinder in Fig. 9 is supplied. Fig. 12 is a schematic representation of a brake system associated with the assist brake part of Fig. 9 added support pump. Fig. 13 is a schematic representation of a second embodiment of the brake system connected to the main brake part of Fig. 8 connected support brake part. DETAILED DESCRIPTION

[0021] An electronic hydraulic brake device will be described below with reference to the accompanying drawings using various embodiments. Note that the drawings are not precisely to scale and may be exaggerated in line thickness or component size for the sake of clarity and descriptiveness. Furthermore, the terms used herein are chosen with the functions of the invention in mind and may be changed depending on the custom or intention of users or operators. Therefore, the definitions of the terms should be understood in accordance with the entirety of the disclosures contained herein.

[0022] Fig. 1 is a schematic diagram of an electronic hydraulic brake device according to an embodiment of the disclosure. According to Fig. 1, the electronic hydraulic brake device according to the embodiment of the disclosure includes a main brake part 1 and a supporting brake part 2.

[0023] The main brake part 1 drives a motor to provide hydraulic braking pressure to a plurality of wheel cylinders 3. The auxiliary brake part 2 is connected to the main brake part 1 and filled with a high hydraulic braking pressure. The auxiliary brake part 2 provides hydraulic braking pressure to the plurality of wheel cylinders 3 when an operational failure of the main brake part 1 occurs.

[0024] That is, in the electronic hydraulic brake device according to the embodiment of the disclosure, an electronic brake device of an electric vehicle, hybrid vehicle, or autonomous vehicle may be divided into two parts, that is, the main brake part 1 and the auxiliary brake part 2.

[0025] When an operational failure of the main brake part 1 occurs, the high hydraulic brake pressure stored in the auxiliary brake part 2 can be quickly supplied to the wheel cylinders 3 to perform emergency braking. At this time, the operational failure of the main brake part 1 may indicate that the engine cannot be driven or may indicate operational failures of various valves for controlling a hydraulic circuit.

[0026] Fig. 2 is a schematic representation of a main brake part according to a first embodiment of the disclosure. According to Fig. 2, the main brake part 1 according to a first embodiment of the disclosure comprises a pedal cylinder 110, a master cylinder 120, a first hydraulic part 130, a second hydraulic part 140 and a hydraulic connection 150.

[0027] The pedal cylinder part 110 generates hydraulic pressure by pressurizing a pedal 119. Such a pedal cylinder 110 may have two chambers formed therein and may provide a stepping force for handling the pressurization of the pedal 119.

[0028] The master cylinder 120 senses whether the pedal 119 is depressed and generates hydraulic pressure by driving a motor 129. The master cylinder 120 may form one or more chambers, and the motor 129 may be driven in a forward or reverse direction depending on the pressurization state of the pedal 119. The master cylinder 120 may be connected to the pedal cylinder 110 via a cylinder line 128.

[0029] The first hydraulic part 130 is connected to the master cylinder 120 and supplies brake pressure to some of the plurality of wheel cylinders 3. For example, the first hydraulic part 130 may supply hydraulic pressure to first wheel cylinders 4 mounted on one of the two front wheels or one of the two rear wheels.

[0030] In particular, the first hydraulic part 130 may have a first-first hydraulic line 131 connected to the master cylinder 120 for carrying brake pressure and a first-second hydraulic line 132 connected to the first-first hydraulic line 131 and diverging from the first-first hydraulic line 131 for carrying brake pressure to the first wheel cylinder 4.

[0031] The second hydraulic part 140 is connected to the master cylinder 120 and supplies brake pressure to the other of the plurality of wheel cylinders 3. For example, the second hydraulic part 140 may supply hydraulic pressure to second wheel cylinders 5 mounted on the other of the two front wheels or the other of the two rear wheels.

[0032] In particular, the second hydraulic part 140 may have a second-first hydraulic line 141 connected to the master cylinder 120 for carrying brake pressure and a second-second hydraulic line 142 connected to the second-first hydraulic line 141 and diverging from the second-first hydraulic line 141 for carrying brake pressure to the second wheel cylinder 5.

[0033] The hydraulic port 150 connects or disconnects the first and second hydraulic parts 130 and 140. For example, the hydraulic port 150 can connect the first-second hydraulic line 132 and the second-second hydraulic line 142.

[0034] Fig. 3 is a schematic representation of a first embodiment of a brake system connected to the main brake part of Fig. 2 connected support brake part. According to Fig. 3, the assist brake part 2 comprises an assist hydraulic part 10, an assist accumulator 20, an assist bypass part 30, and an assist sensing part 40. The hydraulic connection 150 can enable a movement of hydraulic brake pressure between the first and second hydraulic parts 130 and 140.

[0035] The assist hydraulic part 10 is connected to one of the first and second hydraulic parts 130 and 140 for conducting hydraulic brake pressure. For example, the assist hydraulic part 10 may be connected to the first-second hydraulic line 132 or the second-second hydraulic line 142.

[0036] The assist accumulator 20 is connected to the assist hydraulic part 10 and can be filled with high hydraulic brake pressure.

[0037] The assist bypass part 30 bypasses the assist hydraulic part 10 to supply hydraulic braking pressure to the assist accumulator 20. For example, the assist accumulator 20 may be filled with the hydraulic braking pressure through the assist bypass part 30, and the hydraulic braking pressure of the assist accumulator 20 may be supplied to the first or second hydraulic part 130 or 140 through the assist hydraulic part 10.

[0038] The assist sensing part 40 measures the hydraulic brake pressure of the assist accumulator 20. For example, the assist sensing part 40 may be configured to measure the hydraulic brake pressure in the assist hydraulic part 10 or the assist accumulator 20.

[0039] In this state, the motor 129 is driven in the initial phase to fill the assist accumulator 20 with high hydraulic brake pressure. Then, hydraulic brake pressure generated by the master cylinder 120 is moved to the assist accumulator 20. At this time, the movement of the hydraulic brake pressure to the cylinder line 128 is restricted, and the movement of the hydraulic brake pressure to the first and second wheel cylinders 4 and 5 is restricted (see Fig. 4).

[0040] When an operational failure of the main brake part 1 occurs in the case where vehicle braking is required, the high hydraulic braking pressure stored in the assist accumulator 20 is moved to the first-second hydraulic line 132 or the second-second hydraulic line 142 and then moved to the first wheel cylinder 4 and the second wheel cylinder 5. At this time, the movement of the hydraulic braking pressure to the first-first hydraulic line 131 and the second-first hydraulic line 141 is restricted (see Fig. 5).

[0041] When the first hydraulic line 131 and the second hydraulic line 141 are opened during vehicle braking by the auxiliary brake part 2, the hydraulic braking pressure of the wheel cylinder 3 can be released. When the hydraulic braking pressure needs to be released quickly, such as in vehicle attitude control, the hydraulic braking pressure applied to the wheel cylinder 3 can be adjusted by valve-controlled control of the first hydraulic line 132 and the second hydraulic line 142.

[0042] The assist hydraulic part 10 includes an assist hydraulic line 11 and an assist hydraulic valve 12. The assist hydraulic line 11 has one end connected to one of the first and second hydraulic parts 130 and 140, and the other end connected to the assist accumulator 20. The assist hydraulic valve 12 is formed on the assist hydraulic line 11 and opens the assist hydraulic line 11 when an operation failure of the main brake part 1 occurs. For example, the assist hydraulic line 11 may have one end connected to the first-second hydraulic line 132 or the second-second hydraulic line 142.

[0043] The assist bypass part 30 includes an assist bypass line 31 and an assist bypass valve 32. The assist bypass line 31 has both ends connected to the assist hydraulic line 11 and causes hydraulic braking pressure to move to the assist accumulator 20, bypassing the assist hydraulic valve 12. The assist bypass valve 32 is formed on the assist bypass line 31 and allows hydraulic braking pressure to move in one direction. For example, when the assist accumulator 20 is filled with hydraulic braking pressure, the assist hydraulic valve 12 can close the assist hydraulic line 11, allowing the hydraulic braking pressure to move through the assist bypass line 31.In this case, a check valve capable of allowing brake fluid to move in one direction may be used as the assist bypass valve 32.

[0044] Fig. 6 is a schematic representation of a brake assist part in Fig. 2 added support pump. According to Fig. 6, the assist brake part 2 according to the first embodiment of the disclosure may further include an assist pump 50. The assist pump 50 is connected to a storage part 118, which may be connected to the pedal cylinder 110 for temporarily storing hydraulic brake pressure and forcibly transferring the hydraulic brake pressure stored in the storage part 118 to the assist accumulator 20. Since the hydraulic brake pressure can be continuously supplied to the assist accumulator 20 via the assist pump 50, vehicle braking can be continuously performed even when an operational failure of the main brake part 1, such as damage to the motor 129, occurs.

[0045] Fig. 7 is a schematic representation of a second embodiment of the brake system connected to the main brake part of Fig. 2 connected support brake part. According to Fig. 7, the assist brake part 2 includes a first assist hydraulic part 61, a second assist hydraulic part 62, an assist accumulator 70, a first assist bypass part 81, a second assist bypass part 82, and an assist sensing part 90. Here, the hydraulic port 150 restricts the movement of hydraulic brake pressure between the first hydraulic part 130 and the second hydraulic part 140 and maintains the state in which the first and second hydraulic parts 130 and 140 are partitioned.

[0046] The first assist hydraulic part 61 is connected to the first hydraulic part 130 for conducting hydraulic braking pressure, and the second assist hydraulic part 62 is connected to the second hydraulic part 140 for conducting hydraulic braking pressure. For example, the first assist hydraulic part 61 may connect the first-second hydraulic line 132 to the assist accumulator 70, and the second assist hydraulic part 62 may connect the second-second hydraulic line 142 to the assist accumulator 70 or the first assist hydraulic part 61.

[0047] The assist accumulator 70 may be connected to the first and second hydraulic parts 61 and 62 and filled with high hydraulic brake pressure.

[0048] The first assist bypass part 81 bypasses the first assist hydraulic part 61 to supply hydraulic braking pressure to the assist accumulator 70, and the second assist bypass part 82 bypasses the second assist hydraulic part 62 to supply hydraulic braking pressure to the assist accumulator 70. For example, the assist accumulator 70 may be filled with hydraulic braking pressure through the first or second assist bypass part 81 or 82, and the hydraulic braking pressure of the assist accumulator 70 may be moved to each of the first and second assist bypass parts 81 and 82.

[0049] The assist sensing part 90 measures the hydraulic braking pressure of the assist accumulator 70. For example, the assist sensing part 90 may be configured to measure the hydraulic braking pressure in the first and second assist hydraulic parts 61 and 62 or the assist accumulator 70.

[0050] In this state, the motor 129 is driven in the initial phase to fill the assist accumulator 70 with high hydraulic braking pressure. Then, the hydraulic braking pressure generated by the master cylinder 120 is moved to the assist accumulator 70. At this time, the movement of the hydraulic braking pressure to the cylinder line 128 is restricted, and the movement of the hydraulic braking pressure to the first and second wheel cylinders 4 and 5 is restricted.

[0051] When an operational failure of the main brake part 1 occurs in the case where vehicle braking is required, the high hydraulic braking pressure stored in the assist accumulator 70 is moved to the first-second hydraulic line 132 and the second-second hydraulic line 142, and then moved to the first wheel cylinder 4 and the second wheel cylinder 5. At this time, the movement of hydraulic braking pressure to the first-first hydraulic line 131 and the second-first hydraulic line 141 is restricted.

[0052] When the first-first hydraulic line 131 and the second-first hydraulic line 141 are opened during vehicle braking by the auxiliary brake part 2, the hydraulic braking pressure of the wheel cylinder 3 can be released. When the hydraulic braking pressure needs to be released quickly, such as in vehicle attitude control, the hydraulic braking pressure applied to the wheel cylinder 3 can be adjusted by valve-controlling the first-second hydraulic line 132 and the second-second hydraulic line 142.

[0053] The detailed structures of the first and second support hydraulic parts 61 and 62 may be similar to those of the support hydraulic part 10 of Fig. 3, and the detailed structures of the first and second support bypass parts 81 and 82 may be the same as those of the support bypass part 30 of Fig. 3. The support pump 50 of Fig. 6 can be used in the support accumulator 70 of Fig. 7 may be applied.

[0054] Fig. 8 is a schematic representation of a main brake part according to a second embodiment of the disclosure. According to Fig. 8, the main brake part 1 according to the second embodiment of the disclosure includes a main motor pump 210, a master cylinder 220, a first hydraulic part 230, and a second hydraulic part 240.

[0055] The master cylinder 220 generates hydraulic braking pressure by driving a motor 229. The master cylinder 220 may form two chambers, and the motor 229 may be driven in a forward or reverse direction according to a pressurization state of the pedal 119.

[0056] The first hydraulic part 230 is connected to the master cylinder 220 and supplies brake pressure to some of the plurality of wheel cylinders 3. For example, the first hydraulic part 230 may supply hydraulic pressure to the first wheel cylinders 4 mounted on one of two front wheels or one of two rear wheels, respectively.

[0057] The second hydraulic part 240 is connected to the master cylinder 220 and supplies brake pressure to the other of the plurality of wheel cylinders 3. For example, the second hydraulic part 240 may supply hydraulic pressure to the second wheel cylinders 5 mounted on the other of the two front wheels and the other of the two rear wheels, respectively.

[0058] The main motor pump 210 is connected to the first and second hydraulic parts 230 and 240 to amplify the hydraulic brake pressure.

[0059] The first hydraulic part 230 may include a first-first hydraulic line 231 connecting the master cylinder 220 to the main motor pump 210, and a first-second hydraulic line 232 connected to and diverging from the first-first hydraulic line 231 for supplying a brake pressure to the first wheel cylinder 4.

[0060] The second hydraulic part 240 may include a second-first hydraulic line 241 connecting the master cylinder 220 to the main motor pump 210, and a second-second hydraulic line 242 connected to the second-first hydraulic line 241 and diverging from the second-first hydraulic line 241 for supplying brake pressure to the second wheel cylinder 5.

[0061] Fig. 9 is a schematic representation of a first embodiment of a brake system connected to the main brake part of Fig. 8 connected support brake part. According to Fig. 9, the assist brake part 2 has an assist hydraulic part 10, an assist accumulator 20, an assist bypass part 30 and an assist sensing part 40.

[0062] The assist hydraulic part 10 is connected to the first and second hydraulic parts 230 and 240 for conducting hydraulic brake pressure. For example, the assist hydraulic part 10 may be connected to the first-second hydraulic line 232 and the second-second hydraulic line 242.

[0063] The assist accumulator 20 is connected to the assist hydraulic part 10 and can be filled with high hydraulic brake pressure.

[0064] The assist bypass part 30 bypasses the assist hydraulic part 10 to supply hydraulic braking pressure to the assist accumulator 20. For example, the assist accumulator 20 may be filled with the hydraulic braking pressure through the assist bypass part 30, and the hydraulic braking pressure of the assist accumulator 20 may be supplied to the first and second hydraulic parts 230 and 240 through the assist hydraulic part 10.

[0065] The assist sensing part 40 measures the hydraulic brake pressure of the assist accumulator 20. For example, the assist sensing part 40 may be configured to measure the hydraulic brake pressure in the assist hydraulic part 10 or the assist accumulator 20.

[0066] In this state, the motor 229 and the main motor pump 210 are driven in the initial phase to fill the assist accumulator 20 with high hydraulic braking pressure. Then, the hydraulic braking pressure generated by the master cylinder 220 is supplied to the main motor pump 210 through the first-first hydraulic line 231 and the second-first hydraulic line 241, and the hydraulic braking pressure that has passed through the main motor pump 210 is moved to the assist accumulator 20 through the assist hydraulic part 10 connected to the first-second hydraulic line 232 and the second-second hydraulic line 242. At this time, the movement of hydraulic braking pressure from the main motor pump 210 to the master cylinder 220 is restricted, and the movement of hydraulic braking pressure to the first and second wheel cylinders 4 and 5 is restricted (see Fig. 10).

[0067] When an operation failure of the main brake part 1 occurs in the case where vehicle braking is required, the high hydraulic braking pressure stored in the assist accumulator 20 is moved to the first-second hydraulic line 232 and the second-second hydraulic line 242 and then moved to the first wheel cylinder 4 and the second wheel cylinder 5. At this time, the movement of hydraulic braking pressure to the first-first hydraulic line 231 and the second-first hydraulic line 241 is restricted (see Fig. 11).

[0068] When the first hydraulic line 231 and the second hydraulic line 241 are opened during vehicle braking by the auxiliary brake part 2, the hydraulic braking pressure of the wheel cylinder 3 can be released. When the hydraulic braking pressure needs to be released quickly, such as in vehicle attitude control, the hydraulic braking pressure applied to the wheel cylinder 3 can be adjusted by valve-controlled control of the first hydraulic line 232 and the second hydraulic line 242.

[0069] The assist hydraulic part 10 includes an assist hydraulic line 11 and an assist hydraulic valve 12. One end of the assist hydraulic line 11 is connected to the first and second hydraulic parts 230 and 240, and the other end of the assist hydraulic line 11 is connected to the assist accumulator 20. The assist hydraulic valve 12 is formed on the assist hydraulic line 11 and opens the assist hydraulic line 11 when an operation failure of the main brake part 1 occurs. For example, the assist hydraulic line 11 may have one end connected to the first-second hydraulic line 232 and the second-second hydraulic line 241.

[0070] The assist bypass part 30 includes an assist bypass line 31 and an assist bypass valve 32. The assist bypass line 31 has both ends connected to the assist hydraulic line 11, causing hydraulic braking pressure to bypass the assist hydraulic valve 12 and move to the assist accumulator 20. The assist bypass valve 32 is formed on the assist bypass line 31 and allows hydraulic braking pressure to move in one direction. For example, when the assist accumulator 20 is filled with hydraulic braking pressure, the assist hydraulic valve 12 can close the assist hydraulic line 11, allowing the hydraulic braking pressure to move through the assist bypass line 31.In this case, a check valve capable of allowing a brake fluid to move in one direction may be used as the assist bypass valve 32.

[0071] Fig. 12 is a schematic representation of a brake system associated with the assist brake part of Fig. 9 added support pump. According to Fig. 12, the assist brake part 2 according to the first embodiment of the disclosure may further include an assist pump 50. The assist pump 50 is connected to a storage part 228, which may be connected to the master cylinder 220 for temporarily storing hydraulic brake pressure and forcibly transferring the hydraulic brake pressure stored in the storage part 228 to the assist accumulator 20. Since hydraulic brake pressure can be continuously supplied to the assist accumulator 20 via the assist pump 50, vehicle braking can be continuously performed even if an operational failure occurs in the main brake part 1, such as damage to the motor 229.

[0072] Fig. 13 is a schematic representation of a second embodiment of the brake system connected to the main brake part of Fig. 8 connected support brake part. According to Fig. 13, the assist brake part 2 has a first assist hydraulic part 61, a second assist hydraulic part 62, an assist accumulator 70, a first assist bypass part 81, a second assist bypass part 82 and an assist sensing part 90.

[0073] The first assist hydraulic part 61 is connected to the first hydraulic part 230 for carrying hydraulic braking pressure, and the second assist hydraulic part 62 is connected to the second hydraulic part 240 for carrying hydraulic braking pressure. For example, the first assist hydraulic part 61 may connect the first-second hydraulic line 132 to the assist accumulator 70, and the second-second assist hydraulic part 62 may connect the second-second hydraulic line 142 to the assist accumulator 70 or the first assist hydraulic part 61.

[0074] The assist accumulator 70 may be connected to the first and second assist hydraulic parts 61 and 62 and may be filled with high hydraulic brake pressure.

[0075] The first assist bypass part 81 bypasses the first assist hydraulic part 61 to supply hydraulic braking pressure to the assist accumulator 70, and the second assist bypass part 82 bypasses the second assist hydraulic part 62 to supply hydraulic braking pressure to the assist accumulator 70. For example, the assist accumulator 70 may be filled with hydraulic braking pressure through the first or second assist bypass part 81 or 82, and the hydraulic braking pressure of the assist accumulator 70 may be moved to each of the first and second assist bypass parts 81 and 82.

[0076] The assist sensing part 90 measures the hydraulic braking pressure of the assist accumulator 70. For example, the assist sensing part 90 may be configured to measure the hydraulic braking pressure in the first and second assist hydraulic parts 61 and 62 or the assist accumulator 70.

[0077] In this state, the motor 229 is driven in the initial phase to fill the assist accumulator 70 with high hydraulic braking pressure. Then, the hydraulic braking pressure generated by the master cylinder 220 is moved to the assist accumulator 70. At this time, the movement of the hydraulic braking pressure from the main motor pump 210 to the master cylinder 220 is restricted, and the movement of the hydraulic braking pressure to the first and second wheel cylinders 4 and 5 is restricted.

[0078] When an operational failure of the main brake part 1 occurs in the case where vehicle braking is required, the high hydraulic braking pressure stored in the assist accumulator 70 is moved to the first-second hydraulic line 232 and the second-second hydraulic line 242, and then moved to the first wheel cylinder 4 and the second wheel cylinder 5. At this time, the movement of hydraulic braking pressure to the first-first hydraulic line 231 and the second-first hydraulic line 241 is restricted.

[0079] When the first hydraulic line 231 and the second hydraulic line 241 are opened during vehicle braking by the auxiliary brake part 2, the hydraulic braking pressure of the wheel cylinder 3 can be released. When the hydraulic braking pressure needs to be released quickly, such as in vehicle attitude control, the hydraulic braking pressure applied to the wheel cylinder 3 can be adjusted by valve-controlled control of the first hydraulic line 232 and the second hydraulic line 242.

[0080] The detailed structures of the first and second support hydraulic parts 61 and 62 may be similar to those of the support hydraulic part 10 of Fig. 9, and the detailed structures of the first and second support bypass parts 81 and 82 may be the same as those of the support bypass part 30 of Fig. 9. The support pump 50 of Fig. 12 can be used in the support accumulator 70 of Fig. 13 may be applied.

[0081] In the electronic hydraulic brake device according to the embodiment of the disclosure, the main brake part 1 and the auxiliary brake part 2 for moving hydraulic braking pressure may be connected as a hydraulic pressure circuit for moving hydraulic pressure, and high hydraulic braking pressure stored in the auxiliary brake part 2 may be moved to the main brake part 1 and supplied to the wheel cylinders 3 when an operation failure of the main brake part 1 occurs.

[0082] Further, the assist pump 50 forcibly moves brake fluid stored in the storage part 118 or 228 to the assist accumulator 20. Therefore, when an operation failure of the main brake part 1 occurs, hydraulic pressure for performing vehicle braking can be continuously supplied to the assist accumulator 20.

[0083] Although preferred embodiments of the disclosure have been described for illustrative purposes, those skilled in the art will recognize that various modifications, additions, and substitutions are possible without departing from the scope and spirit of the disclosure as defined in the appended claims. Thus, the true technical scope of the disclosure is defined by the following claims.

Claims

[1] Electronic hydraulic braking device comprising: a main brake part (1) having a first hydraulic part (130, 230) and a second hydraulic part (140, 240) formed therein to drive a motor (129, 229) for supplying hydraulic pressure to a plurality of wheel cylinders (3); and a backup brake part (2) connected to one or more of the first and second hydraulic parts (130, 140, 230, 240) to be filled with high hydraulic brake pressure and configured to provide hydraulic brake pressure to the plurality of wheel cylinders (3) when an operational failure of the main brake part (1) occurs, wherein the assist brake part (2) comprises: an assist hydraulic part connected to one of the first and second hydraulic parts (130, 140, 230, 240) and configured to carry hydraulic braking pressure; an assist accumulator (20, 70) connected to the assist hydraulic part (10) and filled with high hydraulic brake pressure; an assist bypass part (30) configured to bypass the assist hydraulic part to supply hydraulic brake pressure to the assist accumulator (20, 70); and an assistance sensing part (40, 90) designed to measure the hydraulic brake pressure of the assistance accumulator (20, 70), characterized by , that the hydraulic braking pressure generated by the main braking part (1) by driving the motor (129, 229) is moved to the assist accumulator (20, 70) to fill the assist accumulator (20, 70). [2] Electronic hydraulic brake device according to claim 1, wherein the main brake part (1) comprises: a pedal cylinder (110) configured to generate hydraulic pressure when a pedal (119) is applied with pressure, and connected to the first hydraulic part (130, 230) to supply hydraulic braking pressure to some of the plurality of wheel cylinders (3), and connected to the second hydraulic part (140, 240) to supply hydraulic braking pressure to the others of the plurality of wheel cylinders (3); and a hydraulic connection (150) configured to connect or disconnect the first and second hydraulic parts (130, 140, 230, 240). [3] Electronic hydraulic brake device according to claim 1, wherein the main brake part (1) comprises: a master cylinder (120, 220) configured to drive the motor (129, 229) to generate hydraulic pressure, and connected to the first hydraulic part (130, 230) to supply hydraulic braking pressure to some of the plurality of wheel cylinders, and connected to the second hydraulic part (140, 240) to supply hydraulic braking pressure to the others of the plurality of wheel cylinders; and a main motor pump mounted in the first and second hydraulic parts (130, 140, 230, 240) and configured to amplify the hydraulic braking pressure of the first and second hydraulic parts (130, 140, 230, 240). [4] Electronic hydraulic brake device according to claim 1, wherein the assist hydraulic part (10) comprises: an assist hydraulic line (11) having one end connected to one of the first and second hydraulic parts (130, 140, 230, 240) and the other end connected to the assist accumulator (20, 70); and an assist hydraulic valve (12) provided on the assist hydraulic line (11) and configured to open the assist hydraulic line when an operational error of the main brake part (1) occurs. [5] Electronic hydraulic brake device according to claim 4, wherein the assist bypass part (30) comprises: an assist bypass line (31) having both ends connected to the assist hydraulic line (11) and configured to cause hydraulic brake pressure to bypass the assist hydraulic valve (12) and be moved to the assist accumulator (20, 70); and an assist bypass valve (32) formed on the assist bypass line (31) and configured to allow hydraulic brake pressure to be moved in one direction. [6] The electronic hydraulic brake device according to claim 1, wherein the assist brake part (2) further comprises an assist pump (50) connected to a storage part (118) connected to the main brake part (1) for storing hydraulic braking pressure, and configured to transmit the hydraulic braking pressure stored in the storage part (118) to the assist accumulator (20, 70). [7] Electronic hydraulic brake device according to claim 1, wherein the assist brake part (2) comprises: a first assist hydraulic part (61) connected to the first hydraulic part (130, 230) and configured to supply hydraulic brake pressure; a second assist hydraulic part (62) connected to the second hydraulic part (140, 240) and configured to supply hydraulic brake pressure; wherein the assist accumulator (20, 70) is connected to the first and second assist hydraulic parts (61, 62); a first assist bypass part (81) configured to bypass the first assist hydraulic part (61) to supply hydraulic brake pressure to the assist accumulator (20, 70); a second assist bypass part (82) configured to bypass the second assist hydraulic part (62) to supply hydraulic brake pressure to the assist accumulator (20, 70); and an assist sensing part (40, 90) configured to measure the hydraulic braking pressure of the assist accumulator (20, 70).

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