Brake-by-wire system of single-cavity master cylinder

Abstract

The utility model discloses a brake-by-wire system of a single-cavity master cylinder, which comprises an oil can, an electric cylinder, the single-cavity master cylinder, a brake pedal, a pedal simulator, a two-position four-way valve, a liquid inlet pipe, a first hydraulic pipe, a second hydraulic pipe, a first liquid outlet pipe, a second liquid outlet pipe and an isolating valve. The two-position four-way valve is communicated with the first liquid outlet pipe and the first hydraulic pipe and is communicated with the second liquid outlet pipe and the second hydraulic pipe. The single-cavity master cylinder replaces a double-cavity master cylinder in the prior art, the two-position four-way valve replaces a two-position three-way valve in the prior art, then a pedal simulation valve, a master cylinder isolation valve and an electric cylinder isolation valve are replaced, and the overall manufacturing cost is greatly reduced on the premise that all functions are reserved. In the embodiment, the number of constant electric subsystems is reduced, the standby power consumption is reduced, the energy consumption performance can be improved, the volume of the single-cavity master cylinder is large, the redundant liquid amount is larger, and the backup braking capacity is higher; the oil can is simpler in structure and facilitates arrangement of the whole vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile braking, in particular to a new wire-controlled braking system of a single-cavity master cylinder. Background Art

[0002] With the popularization of automobile electrification and driverless driving, the automobile braking system has lost its convenient vacuum source, so the vacuum booster needs to be eliminated; in addition, the braking needs of driverless driving have put forward higher requirements on the active braking performance and life of the system, making the currently commonly used electronic stability control system (ESC) unable to meet the requirements, prompting the emergence and gradual popularization of a new generation of wire control brake systems, and the wire control brake system with the most basic electronic booster has been increasingly used. Among the electronic power-assisting systems, hydraulic power-assisting has the best performance. During hydraulic braking, the driver steps on the brake pedal, and the pedal feel is formed by the pedal simulator. However, the current brake system uses a double-chamber master cylinder, which is costly. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a new wire-controlled braking system with a single-chamber master cylinder, which uses a single-chamber master cylinder to replace the double-chamber master cylinder in traditional technology, and uses a two-position four-way valve to replace the two-position three-way valve in traditional technology, thereby replacing the pedal simulation valve, the master cylinder isolation valve and the electric cylinder isolation valve, thereby greatly reducing the overall manufacturing cost while retaining all functions.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] The utility model provides a wire-controlled braking system of a single-chamber master cylinder, comprising an oil pot, an electric cylinder, a single-chamber master cylinder, a brake pedal, a pedal simulator, a two-position four-way valve, a liquid inlet pipe, a first hydraulic pipe, a second hydraulic pipe, a first liquid outlet pipe, a second liquid outlet pipe and a shut-off valve, wherein the oil pot is connected to the electric cylinder and the single-chamber master cylinder through a liquid inlet pipe; the brake pedal is connected to the single-chamber master cylinder; the first hydraulic pipe is connected between the electric cylinder and the two-position four-way valve, the second hydraulic pipe is connected between the single-chamber master cylinder and the two-position four-way valve, the first liquid outlet pipe connects the two-position four-way valve and the shut-off valve, the second liquid outlet pipe connects the two-position four-way valve and the pedal simulator, and when the two-position four-way valve is energized, the two-position four-way valve connects the first liquid outlet pipe with the first hydraulic pipe, and connects the second liquid outlet pipe with the second hydraulic pipe.

[0006] In the present utility model, as an optional embodiment, the liquid inlet pipe includes a first liquid inlet pipe and a second liquid inlet pipe, the oil pot is connected to the electric cylinder through the first liquid inlet pipe, and the oil pot is connected to the single-chamber master cylinder through the second liquid inlet pipe. The embodiment improves the liquid inlet pipe by using the first liquid inlet pipe and the second liquid inlet pipe to connect the electric cylinder and the single-chamber master cylinder respectively. Such a design helps to better control the flow of brake fluid and ensure the stability and response speed of the braking system. By optimizing the pipeline layout and connection method, the efficiency and reliability of the braking system can be improved, providing the driver with a better braking experience.

[0007] In the present invention, as an optional embodiment, a pressure sensor is further included, which is arranged on the brake pedal and is used to detect the pedaling force of the brake pedal. The pedaling force of the brake pedal is detected by the pressure sensor and transmitted to the control system, which can provide more accurate data support for the subsequent system to control the braking force.

[0008] In the present invention, as an optional embodiment, a travel sensor is further included, which is arranged on the brake pedal and is used to detect the pedal stroke of the brake pedal. The pedal stroke of the brake pedal is detected by the travel sensor and transmitted to the braking system, which can provide more accurate data support for the subsequent system to control the braking force.

[0009] In the present utility model, as an optional embodiment, it further includes a left wheel cylinder and a right wheel cylinder, and the first fluid outlet pipe is connected to the left wheel cylinder and the right wheel cylinder respectively. The left wheel cylinder and the right wheel cylinder are the final execution components of the braking system, and the left wheel cylinder is controlled by hydraulic pressure to brake the left wheel, and the right wheel cylinder is controlled to brake the right wheel.

[0010] In the present utility model, as an optional embodiment, the isolation valve includes a left isolation valve and a right isolation valve, the first liquid outlet pipe is connected to the left wheel cylinder through the left isolation valve, and the first liquid outlet pipe is connected to the right wheel cylinder through the right isolation valve. The isolation valve of the embodiment is used to block the hydraulic flow under specific requirements, and the distribution of the braking force of the left and right wheels can be achieved by setting the left isolation valve and the right isolation valve.

[0011] In the present utility model, as an optional embodiment, the left wheel cylinder includes an upper left wheel cylinder and a lower left wheel cylinder, the right wheel cylinder includes an upper right wheel cylinder and a lower right wheel cylinder, and the first fluid outlet pipe is connected to the upper left wheel cylinder, the lower left wheel cylinder, the upper right wheel cylinder, and the lower right wheel cylinder respectively. The upper left wheel cylinder, the lower left wheel cylinder, the upper right wheel cylinder, and the lower right wheel cylinder are located at the four wheels of the vehicle, and the braking effect is achieved by receiving the hydraulic pressure from the first fluid outlet pipe.

[0012] In the present utility model, as an optional embodiment, the left isolation valve includes a first isolation valve and a third isolation valve, the right isolation valve includes a second isolation valve and a fourth isolation valve, the first liquid outlet pipe is connected to the upper left wheel cylinder through the first isolation valve, the first liquid outlet pipe is connected to the lower right wheel cylinder through the second isolation valve, the first liquid outlet pipe is connected to the lower left wheel cylinder through the third isolation valve, and the first liquid outlet pipe is connected to the upper right wheel cylinder through the fourth isolation valve. The first liquid outlet pipe of the embodiment is connected to each wheel cylinder of the vehicle through multiple isolation valves to achieve the distribution of braking force.

[0013] In the utility model, as an optional embodiment, it also includes an oil return pipe, one end of which is connected to the oil pot, and the other end of which is respectively connected to the upper left wheel cylinder, the lower left wheel cylinder, the upper right wheel cylinder, and the lower right wheel cylinder. The purpose of adding the oil return pipe in the embodiment is mainly to recycle the used brake fluid from each wheel cylinder back to the oil pot to achieve the recycling of the brake fluid. This ensures that the brake system always maintains an adequate supply of brake fluid to avoid brake failure caused by insufficient brake fluid. At the same time, the recovered brake fluid can be filtered and cooled by the oil pot to remove impurities and reduce the temperature to ensure the quality and performance of the brake fluid.

[0014] In the utility model, as an optional embodiment, it also includes a fifth isolation valve, a sixth isolation valve, a seventh isolation valve and an eighth isolation valve. The other end of the return oil pipe is connected to the upper left wheel cylinder through the fifth isolation valve, the other end of the return oil pipe is connected to the lower right wheel cylinder through the sixth isolation valve, the other end of the return oil pipe is connected to the lower left wheel cylinder through the seventh isolation valve, and the other end of the return oil pipe is connected to the upper right wheel cylinder through the eighth isolation valve. The fifth isolation valve, the sixth isolation valve, the seventh isolation valve and the eighth isolation valve are respectively installed at the connection between the return oil pipe and the four wheel cylinders to allow the system to more accurately control the recovery of the brake fluid. When a wheel cylinder does not need or should not recover the brake fluid, the corresponding isolation valve can be closed to prevent the loss or misoperation of the brake fluid.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The utility model uses a single-chamber master cylinder to replace the double-chamber master cylinder in traditional technology, and uses a two-position four-way valve to replace the two-position three-way valve in traditional technology, and further replaces the pedal simulation valve, the master cylinder isolation valve and the electric cylinder isolation valve, thereby greatly reducing the overall manufacturing cost while retaining all functions; the number of normally-powered subsystems in the embodiment is reduced, and the standby power consumption is reduced, which can improve energy consumption performance; the single-chamber master cylinder has a large volume, more redundant fluid volume, and stronger backup braking capability; the oil pot structure is simpler, which is convenient for the overall vehicle layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic structural diagram of a brake-by-wire system with a single-chamber master cylinder according to an embodiment of the present invention.

[0018] In the figure: 1. oil pot; 2. electric cylinder; 3. single-chamber master cylinder; 4. brake pedal; 5. pedal simulator; 6. two-position four-way valve; 7. first hydraulic pipe; 8. second hydraulic pipe; 9. first liquid outlet pipe; 10. second liquid outlet pipe; 11. first liquid inlet pipe; 12. second liquid inlet pipe; 13. upper left wheel cylinder; 14. lower left wheel cylinder; 15. upper right wheel cylinder; 16. lower right wheel cylinder; 17. first blocking valve; 18. second blocking valve; 19. third blocking valve; 20. fourth blocking valve; 21. oil return pipe; 22. fifth blocking valve; 23. sixth blocking valve; 24. seventh blocking valve; 25. eighth blocking valve. DETAILED DESCRIPTION

[0019] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0020] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0021] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] The embodiment of the present application provides a brake-by-wire system with a single-chamber master cylinder, in which a single-chamber master cylinder is used to replace a double-chamber master cylinder in conventional technology, and a two-position four-way valve is used to replace a two-position three-way valve in conventional technology, thereby replacing a pedal simulation valve, a master cylinder isolation valve and an electric cylinder isolation valve, thereby greatly reducing the overall manufacturing cost while retaining all functions; in the embodiment, the number of normally powered subsystems is reduced, and standby power consumption is reduced, which can improve energy consumption performance; the single-chamber master cylinder has a large volume, more redundant fluid volume, and stronger backup braking capability; the oil pot structure is simpler, which is convenient for overall vehicle layout.

[0024] Please refer to Figure 1 As shown, the wire control braking system of the single-chamber master cylinder provided in this embodiment includes an oil pot 1, an electric cylinder 2, a single-chamber master cylinder 3, a brake pedal 4, a pedal simulator 5, a two-position four-way valve 6, a liquid inlet pipe, a first hydraulic pipe 7, a second hydraulic pipe 8, a first liquid outlet pipe 9, a second liquid outlet pipe 10 and a shut-off valve, wherein the oil pot 1 is connected to the electric cylinder 2 and the single-chamber master cylinder 3 through a liquid inlet pipe; the brake pedal 4 is connected to the single-chamber master cylinder 3; the first hydraulic pipe 7 is connected between the electric cylinder 2 and the two-position four-way valve 6, the second hydraulic pipe 8 is connected between the single-chamber master cylinder 3 and the two-position four-way valve 6, the first liquid outlet pipe 9 connects the two-position four-way valve 6 and the shut-off valve, the second liquid outlet pipe 10 connects the two-position four-way valve 6 and the pedal simulator 5, and when the two-position four-way valve 6 is energized, the two-position four-way valve 6 connects the first liquid outlet pipe 9 with the first hydraulic pipe 7, and connects the second liquid outlet pipe 10 with the second hydraulic pipe 8.

[0025] The wire control brake system provided in the embodiment combines an electric cylinder 2, a single-chamber master cylinder 3, a brake pedal 4, a pedal simulator 5, a two-position four-way valve 6, and a cut-off valve, etc. The oil pot 1 provides brake fluid to the electric cylinder 2 and the single-chamber master cylinder 3 through a liquid inlet pipe. The brake pedal 4 is connected to the single-chamber master cylinder 3. When the driver steps on the brake pedal 4, the single-chamber master cylinder 3 generates pressure to push the brake fluid to flow. When the two-position four-way valve 6 is energized, it changes the connection mode of the hydraulic pipe, so that the first hydraulic pipe is connected to the first outlet pipe, and the second hydraulic pipe is connected to the second outlet pipe.

[0026] The oil pot 1 is a container for storing brake fluid, ensuring that the brake system has enough fluid to transmit the braking force. The electric cylinder 2 is a key component in the wire control brake system, which can quickly and accurately control the pressure of the brake fluid through electronic signals. The single-chamber master cylinder 3 is the core part of the brake system of the embodiment. When the brake pedal 4 is stepped on, it pushes the brake fluid into the brake of the wheel. The isolation valve plays the role of isolating and cutting off the hydraulic circuit in the system to ensure that the brake fluid will not flow back or leak under certain circumstances. The pedal simulator 5 provides a device for the driver to provide brake pedal feedback, simulating the feeling of a traditional brake pedal. When the driver steps on the brake pedal, the pedal simulator will provide a feedback force, allowing the driver to feel the resistance of the pedal, thereby enhancing the realism of the braking operation. The two-position four-way valve 6 is a hydraulic control valve that can change the direction and path of the hydraulic flow when energized. When the two-position four-way valve is energized, it connects the first hydraulic pipe with the first outlet pipe 9 and connects the second hydraulic pipe with the second outlet pipe. The inlet pipe, the first hydraulic pipe, the second hydraulic pipe, the first outlet pipe 9 and the second outlet pipe 10 of the embodiment are all hydraulic lines for transmitting hydraulic pressure between different parts of the brake system. The isolation valve of the embodiment is used to control the flow of hydraulic pressure and can block the hydraulic path when needed.

[0027] The embodiment further includes a pressure sensor, which is disposed on the brake pedal 4 and is used to detect the pedaling force of the brake pedal 4. And further includes a stroke sensor, which is disposed on the brake pedal 4 and is used to detect the pedaling stroke of the brake pedal 4. The pressure sensor and the stroke sensor detect the pedaling force and the pedaling stroke of the pedal 4 respectively, and transmit this information to the control system, so as to control the braking force more accurately later.

[0028] The wire control braking effect of the embodiment has the advantages of fast response speed and high control accuracy, which improves the safety and comfort of the vehicle. At the same time, due to the use of electronic control, it can also realize more complex braking strategies and functions, such as automatic emergency braking and brake energy recovery.

[0029] In order to optimize the pipeline layout and connection mode and better control the flow of brake fluid, the liquid inlet pipe of the embodiment is configured to include a first liquid inlet pipe 11 and a second liquid inlet pipe 12. The oil pot 1 is connected to the electric cylinder 2 through the first liquid inlet pipe 11, and the oil pot 1 is connected to the single-chamber master cylinder 3 through the second liquid inlet pipe 12. By providing the first liquid inlet pipe 11 and the second liquid inlet pipe 12, the stability and response speed of the braking system can be ensured, the efficiency and reliability of the braking system can be improved, and a better braking experience can be provided for the driver.

[0030] The brake-by-wire system of the embodiment also includes a wheel cylinder, which is divided into a left wheel cylinder and a right wheel cylinder, and the first liquid outlet pipe is connected to the left wheel cylinder and the right wheel cylinder respectively. The left wheel cylinder and the right wheel cylinder are the final actuators of the braking system, which control the left wheel cylinder to brake the left wheel through hydraulic pressure, and control the right wheel cylinder to brake the right wheel. Furthermore, the isolation valve of the embodiment includes a left isolation valve and a right isolation valve, and the first liquid outlet pipe 9 is connected to the left wheel cylinder through the left isolation valve, and the first liquid outlet pipe 9 is connected to the right wheel cylinder through the right isolation valve. The isolation valve of the embodiment is used to block the hydraulic flow under specific needs, and the distribution of the braking force to the left and right wheels can be achieved by setting the left isolation valve and the right isolation valve.

[0031] Specifically, the left wheel cylinder includes an upper left wheel cylinder 13 and a lower left wheel cylinder 14, and the right wheel cylinder includes an upper right wheel cylinder 15 and a lower right wheel cylinder 16, and the first liquid outlet pipe 9 is connected to the upper left wheel cylinder 13, the lower left wheel cylinder 14, the upper right wheel cylinder 15, and the lower right wheel cylinder 16 respectively. The upper left wheel cylinder 13, the lower left wheel cylinder 14, the upper right wheel cylinder 15, and the lower right wheel cylinder 16 are located at the four wheels of the automobile, and the braking effect is achieved by receiving the hydraulic pressure from the first liquid outlet pipe 9. In the embodiment, the two-position four-way valve 6 is in the power-off state, the single-chamber master cylinder 3, the electric cylinder 2, and the wheel cylinder are interconnected, wherein a one-way valve is provided at the interface of the electric cylinder, and the pedal simulator 5 is not connected to any module, and when the two-position four-way valve 6 is in the power-on state, the electric cylinder 2 is connected to the wheel cylinder, and the single-chamber master cylinder 3 is connected to the pedal simulator 5.

[0032] Furthermore, in order to achieve a more uniform and efficient distribution of the braking force, the left isolation valve includes a first isolation valve 17 and a third isolation valve 19, the right isolation valve includes a second isolation valve 18 and a fourth isolation valve 20, the first liquid outlet pipe 9 is connected to the upper left wheel cylinder 13 through the first isolation valve 17, the first liquid outlet pipe 9 is connected to the lower right wheel cylinder 16 through the second isolation valve 18, the first liquid outlet pipe 9 is connected to the lower left wheel cylinder 14 through the third isolation valve 19, and the first liquid outlet pipe 9 is connected to the upper right wheel cylinder 15 through the fourth isolation valve 20. Since the first liquid outlet pipe 9 is connected to each wheel cylinder of the vehicle through multiple isolation valves, efficient distribution of the braking force is achieved.

[0033] It also includes an oil return pipe 21, one end of which is connected to the oil pot 1, and the other end of the oil return pipe 21 is respectively connected to the upper left wheel cylinder 13, the lower left wheel cylinder 14, the upper right wheel cylinder 15, and the lower right wheel cylinder 16. The main purpose of adding the oil return pipe 21 in the embodiment is to recycle the used brake fluid from each wheel cylinder back to the oil pot to achieve the recycling of the brake fluid. This can ensure that the brake system always maintains a sufficient supply of brake fluid to avoid brake failure caused by insufficient brake fluid. At the same time, the recovered brake fluid can be filtered and cooled by the oil pot to remove impurities and reduce the temperature to ensure the quality and performance of the brake fluid.

[0034] The embodiment further includes a fifth isolating valve 22, a sixth isolating valve 23, a seventh isolating valve 24 and an eighth isolating valve 25, the other end of the return oil pipe 21 is connected to the upper left wheel cylinder 13 through the fifth isolating valve 22, the other end of the return oil pipe 21 is connected to the lower right wheel cylinder 16 through the sixth isolating valve 23, the other end of the return oil pipe 21 is connected to the lower left wheel cylinder 14 through the seventh isolating valve 24, and the other end of the return oil pipe 21 is connected to the upper right wheel cylinder 15 through the eighth isolating valve 25. Among them, the fifth isolating valve 22, the sixth isolating valve 23, the seventh isolating valve 24 and the eighth isolating valve 25 are respectively installed at the connection between the return oil pipe 21 and the four wheel cylinders, so as to allow the system to more accurately control the recovery of the brake fluid. When a wheel cylinder does not need or should not recover the brake fluid, the corresponding isolating valve can be closed to prevent the loss or misoperation of the brake fluid.

[0035] Although only certain components and embodiments of the present application have been illustrated and described, many modifications and changes may be conceived by those skilled in the art without actually departing from the scope and spirit of the claims, such as changes in the size, dimensions, structure, shape and proportion of the various elements, mounting arrangements, material usage, color, orientation, etc.

[0036] The above-mentioned implementation mode is only a preferred implementation mode of the embodiment of the utility model, and cannot be used to limit the scope of protection of the embodiment of the utility model. Any non-substantial changes and replacements made by technical personnel in this field on the basis of the embodiment of the utility model shall fall within the scope of protection required by the embodiment of the utility model.

Claims

1. A single-chamber master cylinder brake-by-wire system, characterized in that: It includes an oil pot, an electric cylinder, a single-chamber master cylinder, a brake pedal, a pedal simulator, a two-position four-way valve, a liquid inlet pipe, a first hydraulic pipe, a second hydraulic pipe, a first liquid outlet pipe, a second liquid outlet pipe and a shut-off valve, wherein the oil pot is connected to the electric cylinder and the single-chamber master cylinder through a liquid inlet pipe; the brake pedal is connected to the single-chamber master cylinder; the first hydraulic pipe is connected between the electric cylinder and the two-position four-way valve, the second hydraulic pipe is connected between the single-chamber master cylinder and the two-position four-way valve, the first liquid outlet pipe connects the two-position four-way valve and the shut-off valve, the second liquid outlet pipe connects the two-position four-way valve and the pedal simulator, and when the two-position four-way valve is energized, the two-position four-way valve connects the first liquid outlet pipe with the first hydraulic pipe, and connects the second liquid outlet pipe with the second hydraulic pipe.

2. The brake-by-wire system according to claim 1, characterized in that: The liquid inlet pipe includes a first liquid inlet pipe and a second liquid inlet pipe. The oil pot is connected to the electric cylinder via the first liquid inlet pipe, and the oil pot is connected to the single-chamber master cylinder via the second liquid inlet pipe.

3. The brake-by-wire system according to claim 1, characterized in that: It also includes a pressure sensor, which is arranged on the brake pedal and is used to detect the pedaling force of the brake pedal.

4. The brake-by-wire system according to claim 1 or 3, characterized in that: The utility model also comprises a stroke sensor, wherein the stroke sensor is arranged on the brake pedal and is used for detecting the pedaling stroke of the brake pedal.

5. The brake-by-wire system according to claim 1, characterized in that: It also includes a left wheel cylinder and a right wheel cylinder, and the first liquid outlet pipe is connected to the left wheel cylinder and the right wheel cylinder respectively.

6. The brake-by-wire system according to claim 5, characterized in that: The isolation valve includes a left isolation valve and a right isolation valve, the first liquid outlet pipe is connected to the left wheel cylinder through the left isolation valve, and the first liquid outlet pipe is connected to the right wheel cylinder through the right isolation valve.

7. The brake-by-wire system according to claim 6, characterized in that: The left wheel cylinder includes an upper left wheel cylinder and a lower left wheel cylinder, the right wheel cylinder includes an upper right wheel cylinder and a lower right wheel cylinder, and the first fluid outlet pipe is connected to the upper left wheel cylinder, the lower left wheel cylinder, the upper right wheel cylinder, and the lower right wheel cylinder respectively.

8. The brake-by-wire system according to claim 7, characterized in that: The left isolation valve includes a first isolation valve and a third isolation valve, the right isolation valve includes a second isolation valve and a fourth isolation valve, the first liquid outlet pipe is connected to the upper left wheel cylinder through the first isolation valve, the first liquid outlet pipe is connected to the lower right wheel cylinder through the second isolation valve, the first liquid outlet pipe is connected to the lower left wheel cylinder through the third isolation valve, and the first liquid outlet pipe is connected to the upper right wheel cylinder through the fourth isolation valve.

9. The brake-by-wire system according to claim 7, characterized in that: It also includes an oil return pipe, one end of which is connected to the oil pot, and the other end of which is respectively connected to the left upper wheel cylinder, the left lower wheel cylinder, the right upper wheel cylinder, and the right lower wheel cylinder.

10. The brake-by-wire system according to claim 9, characterized in that: It also includes a fifth isolation valve, a sixth isolation valve, a seventh isolation valve and an eighth isolation valve. The other end of the return oil pipe is connected to the upper left wheel cylinder through the fifth isolation valve, the other end of the return oil pipe is connected to the lower right wheel cylinder through the sixth isolation valve, the other end of the return oil pipe is connected to the lower left wheel cylinder through the seventh isolation valve, and the other end of the return oil pipe is connected to the upper right wheel cylinder through the eighth isolation valve.

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