Active pressure building and pressure regulating control system and vehicle

Abstract

The application discloses an active pressure building and pressure regulating control system, which comprises a main pressure building unit, an oil can, a first electromagnetic valve, a second electromagnetic valve, a liquid pumping mechanism, a first one-way valve, a second one-way valve, a first pipeline, a second pipeline, a third pipeline and a control unit. One end of the first pipeline is connected with the main pressure building unit, the other end of the first pipeline is connected with a first wheel cylinder, and the first electromagnetic valve is connected with the first pipeline. One end of the second pipeline is connected with the oil can, the other end of the second pipeline is connected with the first wheel cylinder, the liquid pumping mechanism, the first one-way valve and the second one-way valve are connected with the second pipeline. One end of the third pipeline is connected with the second pipeline between the oil can and the first one-way valve, the other end of the third pipeline is connected with the first wheel cylinder, and the second electromagnetic valve is connected with the third pipeline. The control unit is electrically connected with the first electromagnetic valve, the second electromagnetic valve and the liquid pumping mechanism. The active pressure building and pressure regulating control system can actively build pressure and regulate pressure, and timely take over the vehicle braking. The application also relates to a vehicle.

Description

Technical Field

[0001] This invention relates to the field of braking technology, and in particular to an active pressure build-up and regulation control system and vehicle. Background Technology

[0002] With the development of autonomous driving, the requirements for backup in case of chassis control module failure are becoming increasingly stringent. In the field of braking control, if the main braking module fails, braking may not be able to continue. In advanced autonomous driving scenarios, the driver may be in a relaxed state and not monitor the braking in time. In this case, the driver may not be able to take over the vehicle in time, leading to a safety accident. Summary of the Invention

[0003] In view of this, the present invention provides an active pressure build-up and regulation control system that can actively build up and regulate pressure and take over vehicle braking in a timely manner.

[0004] An active pressure building and regulating control system includes a main pressure building unit, an oil reservoir, a first solenoid valve, a second solenoid valve, a liquid pumping mechanism, a first check valve, a second check valve, a first pipeline, a second pipeline, a third pipeline, and a control unit. One end of the first pipeline is connected to the main pressure building unit, and the other end is connected to a first wheel cylinder. The first solenoid valve is connected to the first pipeline and is used to block or connect the main pressure building unit and the first wheel cylinder. One end of the second pipeline is connected to the oil reservoir, and the other end is connected to the first wheel cylinder. The liquid pumping mechanism, the first check valve, and the second check valve are connected to the second pipeline. A first check valve is positioned near the inlet of the pumping mechanism, and a second check valve is positioned near the outlet of the pumping mechanism. The first and second check valves are used to prevent brake fluid from flowing from the first wheel cylinder to the reservoir. One end of a third pipeline is connected to the second pipeline between the reservoir and the first check valve, and the other end of the third pipeline is connected to the first wheel cylinder. A second solenoid valve is connected to the third pipeline and is used to block or connect the reservoir and the first wheel cylinder. A control unit is electrically connected to the first solenoid valve, the second solenoid valve, and the pumping mechanism, respectively. The control unit is used to control the opening or closing of the first solenoid valve, the second solenoid valve, and the pumping mechanism.

[0005] In an embodiment of the present invention, the above-mentioned active pressure building and regulating control system further includes a first accumulator, the first accumulator being connected to the second pipeline between the oil reservoir and the first one-way valve, and the third pipeline being connected to the first accumulator.

[0006] In an embodiment of the present invention, the above-mentioned active pressure building and regulating control system further includes a hydraulic sensor. The hydraulic sensor is connected to the first pipeline between the first solenoid valve and the main pressure building unit. The hydraulic sensor is electrically connected to the control unit. The control unit adjusts the current required for the first solenoid valve to seal the first wheel cylinder according to the hydraulic pressure collected by the hydraulic sensor.

[0007] In an embodiment of the present invention, the above-mentioned active pressure building and regulating control system further includes a first return pipe and a third one-way valve. One end of the first return pipe is connected to the first pipeline between the first solenoid valve and the main pressure building unit, and the other end of the first return pipe is connected to the first pipeline between the first solenoid valve and the first wheel cylinder. The third one-way valve is connected to the first return pipe and is used to prevent brake fluid from flowing from the first wheel cylinder to the main pressure building unit.

[0008] In an embodiment of the present invention, the above-mentioned liquid pumping mechanism includes a motor and a first liquid pump. The first output shaft of the motor is connected to the first liquid pump, the first liquid pump is connected to the second pipeline, the first check valve is disposed near the oil inlet of the first liquid pump, and the second check valve is disposed near the oil outlet of the first liquid pump.

[0009] In an embodiment of the present invention, the above-mentioned active pressure building and regulating control system further includes a third solenoid valve, a fourth solenoid valve, a fourth check valve, a fifth check valve, a fourth pipeline, a fifth pipeline, and a sixth pipeline.

[0010] One end of the fourth pipeline is connected to the main pressure building unit, and the other end of the fourth pipeline is connected to the second wheel cylinder. The third solenoid valve is connected to the fourth pipeline and is used to block or connect the main pressure building unit and the second wheel cylinder.

[0011] One end of the fifth pipeline is connected to the oil reservoir, and the other end of the fifth pipeline is connected to the second wheel cylinder; the pumping mechanism also includes a second pump, and the second output shaft of the motor is connected to the second pump; the second pump, the fourth check valve, and the fifth check valve are connected to the fifth pipeline, the fourth check valve is located near the oil inlet of the second pump, and the fifth check valve is located near the oil outlet of the second pump, and the fourth and fifth check valves are used to prevent brake fluid from flowing from the second wheel cylinder to the oil reservoir;

[0012] One end of the sixth pipeline is connected to the fifth pipeline between the oil reservoir and the third one-way valve, and the other end of the sixth pipeline is connected to the second wheel cylinder. The fourth solenoid valve is connected to the sixth pipeline and is used to block or connect the oil reservoir and the second wheel cylinder.

[0013] In an embodiment of the present invention, the above-mentioned active pressure building and regulating control system further includes a second accumulator, the second accumulator being connected to the fifth pipeline between the oil reservoir and the third one-way valve, and the sixth pipeline being connected to the second accumulator.

[0014] In an embodiment of the present invention, the above-mentioned active pressure building and regulating control system further includes a second return pipe and a sixth one-way valve. One end of the second return pipe is connected to the fourth pipeline between the third solenoid valve and the main pressure building unit, and the other end of the second return pipe is connected to the fourth pipeline between the third solenoid valve and the second wheel cylinder. The sixth one-way valve is connected to the second return pipe and is used to prevent brake fluid from flowing from the second wheel cylinder to the main pressure building unit.

[0015] In an embodiment of the present invention, the above-mentioned active pressure building and regulation control system includes an ABS control mode, which includes a first wheel cylinder depressurization mode, a first wheel cylinder pressure holding mode, and a first wheel cylinder pressure boosting mode. In the first wheel cylinder depressurization mode, the control unit controls the first solenoid valve to close and the second solenoid valve to open, and brake fluid is released from the first wheel cylinder into the reservoir. In the first wheel cylinder pressure holding mode, the control unit controls both the first and second solenoid valves to close. In the first wheel cylinder pressure boosting mode, the control unit controls both the first and second solenoid valves to close and controls the pumping mechanism to draw brake fluid into the first wheel cylinder, or the control unit controls the first solenoid valve to open and the second solenoid valve to close, and brake fluid enters the first wheel cylinder from the main pressure building unit.

[0016] This application also relates to a vehicle including the aforementioned active pressure build-up and pressure regulation control system.

[0017] The active pressure build-up and regulation control system of the present invention can provide backup braking, and can actively build up and regulate pressure when the chassis control module fails, and take over the vehicle braking in a timely manner to ensure driving safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the active pressure build-up and regulation control system of this application. Detailed Implementation

[0019] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0020] In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the present application. It should be understood that other embodiments may also be used, and changes in mechanical composition, structure, electrical and operational aspects may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered limiting, and the terminology used herein is for describing particular embodiments only and is not intended to limit the present application.

[0021] Although the terms first, second, etc., are used in some instances to describe various elements herein, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0022] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of a feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition arise only when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some way.

[0023] Figure 1 This is a schematic diagram of the active pressure build-up and regulation control system of this application, as shown below. Figure 1 As shown, the active pressure building and regulating control system includes a main pressure building unit 11, an oil reservoir 12, a first solenoid valve 13, a second solenoid valve 14, a liquid pumping mechanism 17, a first check valve 18, a second check valve 19, a first pipeline 24, a second pipeline 25, a third pipeline 26, and a control unit (not shown).

[0024] One end of the first pipeline 24 is connected to the main pressure building unit 11, and the other end of the first pipeline 24 is connected to the first wheel cylinder 31. The first solenoid valve 13 is connected to the first pipeline 24 and is used to block or connect the main pressure building unit 11 and the first wheel cylinder 31.

[0025] One end of the second pipe 25 is connected to the oil reservoir 12, and the other end of the second pipe 25 is connected to the first wheel cylinder 31. The pumping mechanism 17, the first check valve 18, and the second check valve 19 are connected to the second pipe 25. The first check valve 18 is located near the oil inlet of the pumping mechanism 17, and the second check valve 19 is located near the oil outlet of the pumping mechanism 17. The first check valve 18 and the second check valve 19 are used to prevent brake fluid from flowing from the first wheel cylinder 31 to the oil reservoir 12.

[0026] One end of the third pipe 26 is connected to the second pipe 25 between the oil reservoir 12 and the first check valve 18, and the other end of the third pipe 26 is connected to the first wheel cylinder 31. The second solenoid valve 14 is connected to the third pipe 26 and is used to block or connect the oil reservoir 12 and the first wheel cylinder 31.

[0027] The control unit is electrically connected to the first solenoid valve 13, the second solenoid valve 14, and the liquid extraction mechanism 17, respectively. The control unit is used to control the opening or closing of the first solenoid valve 13, the second solenoid valve 14, and the liquid extraction mechanism 17.

[0028] The active pressure building and regulation control system of this application includes three working modes: direct-flow mode, active pressure boosting mode, and ABS control mode. The ABS control mode includes the first cylinder depressurization mode, the first cylinder pressure holding mode, and the first cylinder pressure boosting mode.

[0029] When the active pressure building and regulation control system is in direct mode, the control unit controls the first solenoid valve 13 to open and controls the second solenoid valve 14 and the pumping mechanism 17 to close. At this time, the main pressure building unit 11 outputs brake fluid into the first wheel cylinder 31.

[0030] When the active pressure building and regulation control system is in active pressure boosting mode, the control unit controls the first solenoid valve 13 and the second solenoid valve 14 to close, and controls the pumping mechanism 17 to start. At this time, the pumping mechanism 17 outputs brake fluid into the first wheel cylinder 31.

[0031] When the active pressure build-up and pressure regulation control system is in the first wheel cylinder pressure relief mode, the control unit controls the first solenoid valve 13 to close and the second solenoid valve 14 to open, so that the brake fluid is released from the first wheel cylinder 31 to the reservoir 12, thereby achieving pressure relief control.

[0032] When the active pressure building and regulation control system is in the first wheel cylinder pressure holding mode, the control unit controls both the first solenoid valve 13 and the second solenoid valve 14 to close. At this time, the brake fluid is locked in the first wheel cylinder 31 to achieve pressure holding control.

[0033] When the active pressure building and regulation control system is in the first cylinder boosting mode, the control unit controls both the first solenoid valve 13 and the second solenoid valve 14 to close and controls the pumping mechanism 17 to start. At this time, the pumping mechanism 17 draws brake fluid into the first cylinder 31. Alternatively, the control unit controls the first solenoid valve 13 to open and the second solenoid valve 14 to close, so that the brake fluid enters the first cylinder 31 from the main pressure building unit 11, thereby achieving boosting control.

[0034] The active pressure build-up and regulation control system of this application can provide backup braking, and can actively build up and regulate pressure when the chassis control module fails, and take over the vehicle braking in a timely manner to ensure driving safety.

[0035] Optionally, the first solenoid valve 13 is a normally open valve, that is, the first solenoid valve 13 is in the open state when the power is off and in the closed state when the power is on.

[0036] Optionally, the second solenoid valve 14 is a normally closed valve, that is, the first solenoid valve 13 is closed when de-energized and open when energized.

[0037] Optionally, the active pressure building and regulation control system further includes a first accumulator 33, which is connected to a second pipeline 25 between the oil reservoir 12 and the first check valve 18, and a third pipeline 26 is connected to the first accumulator 33. In this embodiment, the first accumulator 33 can shorten the pipeline and improve the pressure building and regulation efficiency.

[0038] Optionally, the active pressure building and regulation control system further includes a hydraulic sensor 37. The hydraulic sensor 37 is connected to the first pipeline 24 between the first solenoid valve 13 and the main pressure building unit 11. The hydraulic sensor 37 is electrically connected to the control unit. The control unit adjusts the current required for the first solenoid valve 13 to seal the first wheel cylinder 31 based on the hydraulic pressure P1 detected by the hydraulic sensor 37. In this embodiment, the control unit calculates the pressure difference across the first solenoid valve 13 based on the pressure P1 detected by the hydraulic sensor 37 and the target pressure P2 of the first wheel cylinder 31, and then calculates the current required for the first solenoid valve 13 based on the pressure difference across the first solenoid valve 13, thereby achieving dynamic adjustment of the target pressure.

[0039] Optionally, the active pressure building and regulating control system further includes a first return pipe 35 and a third check valve 20. One end of the first return pipe 35 is connected to a first pipeline 24 between the first solenoid valve 13 and the main pressure building unit 11, and the other end of the first return pipe 35 is connected to the first pipeline 24 between the first solenoid valve 13 and the first wheel cylinder 31. The third check valve 20 is connected to the first return pipe 35 and is used to prevent brake fluid from flowing from the first wheel cylinder 31 to the main pressure building unit 11.

[0040] Optionally, the liquid pumping mechanism 17 includes a motor 171 and a first liquid pump 172. The first output shaft of the motor 171 is connected to the first liquid pump 172. The first liquid pump 172 is connected to the second pipeline 25. A first check valve 18 is located near the oil inlet of the first liquid pump 172, and a second check valve 19 is located near the oil outlet of the first liquid pump 172.

[0041] Optionally, such as Figure 1 As shown, the active pressure building and regulating control system also includes a third solenoid valve 15, a fourth solenoid valve 16, a fourth check valve 21, a fifth check valve 22, a fourth pipeline 27, a fifth pipeline 28, and a sixth pipeline 29.

[0042] One end of the fourth pipe 27 is connected to the main pressure building unit 11, and the other end of the fourth pipe 27 is connected to the second wheel cylinder 32. The third solenoid valve 15 is connected to the fourth pipe 27. The third solenoid valve 15 is used to block or connect the main pressure building unit 11 and the second wheel cylinder 32.

[0043] One end of the fifth pipe 28 is connected to the oil reservoir 12, and the other end of the fifth pipe 28 is connected to the second wheel cylinder 32; the pumping mechanism 17 also includes a second pump 173, and the second output shaft of the motor 171 is connected to the second pump 173; the second pump 173, the fourth check valve 21 and the fifth check valve 22 are connected to the fifth pipe 28, the fourth check valve 21 is located near the oil inlet of the second pump 173, and the fifth check valve 22 is located near the oil outlet of the second pump 173. The fourth check valve 21 and the fifth check valve 22 are used to prevent brake fluid from flowing from the second wheel cylinder 32 to the oil reservoir 12;

[0044] One end of the sixth pipe 29 is connected to the fifth pipe 28 between the oil reservoir 12 and the third one-way valve 20, and the other end of the sixth pipe 29 is connected to the second cylinder 32. The fourth solenoid valve 16 is connected to the sixth pipe 29 and is used to block or connect the oil reservoir 12 and the second cylinder 32. In this embodiment, the pressure building and pressure regulation of the second cylinder 32 are the same as those of the first cylinder 31, and can be controlled separately. For the specific control process, please refer to the pressure building and pressure regulation control of the first cylinder 31, which will not be repeated here.

[0045] Optionally, the active pressure building and regulation control system further includes a second accumulator 34, which is connected to a fifth pipeline 28 between the oil reservoir 12 and the third check valve 20, and a sixth pipeline 29 is connected to the second accumulator 34. In this embodiment, the second accumulator 34 can shorten the pipeline and improve the pressure building and regulation efficiency.

[0046] Optionally, the active pressure building and regulating control system also includes a second return pipe 36 and a sixth check valve 23. One end of the second return pipe 36 is connected to a fourth pipe 27 between the third solenoid valve 15 and the main pressure building unit 11, and the other end of the second return pipe 36 is connected to the fourth pipe 27 between the third solenoid valve 15 and the second wheel cylinder 32. The sixth check valve 23 is connected to the second return pipe 36 and is used to prevent brake fluid from flowing from the second wheel cylinder 32 to the main pressure building unit 11.

[0047] Optionally, the active pressure building and regulation control system includes an ABS control mode, which includes a first wheel cylinder depressurization mode, a first wheel cylinder pressure holding mode, and a first wheel cylinder boosting mode. In the first wheel cylinder depressurization mode, the control unit controls the first solenoid valve 13 to close and the second solenoid valve 14 to open, releasing brake fluid from the first wheel cylinder 31 to the reservoir 12. In the first wheel cylinder pressure holding mode, the control unit controls both the first solenoid valve 13 and the second solenoid valve 14 to close. In the first wheel cylinder boosting mode, the control unit controls both the first solenoid valve 13 and the second solenoid valve 14 to close and controls the pumping mechanism 17 to draw brake fluid into the first wheel cylinder 31. Alternatively, the control unit controls the first solenoid valve 13 to open and the second solenoid valve 14 to close, allowing brake fluid to enter the first wheel cylinder 31 from the main pressure building unit 11.

[0048] Optionally, the third solenoid valve 15 is a normally open valve, that is, the third solenoid valve 15 is in the open state when the power is off and in the closed state when the power is on.

[0049] Optionally, the fourth solenoid valve 16 is a normally closed valve, that is, the fourth solenoid valve 16 is in the closed state when the power is off, and in the open state when the power is on.

[0050] This application also relates to a vehicle including the aforementioned active pressure build-up and pressure regulation control system.

[0051] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. An active pressure build-up and voltage regulation control system, characterized in that, It includes a main pressure building unit, an oil reservoir, a first solenoid valve, a second solenoid valve, a liquid pumping mechanism, a first check valve, a second check valve, a first pipeline, a second pipeline, a third pipeline, and a control unit; One end of the first pipeline is connected to the main pressure building unit, and the other end of the first pipeline is connected to the first wheel cylinder. The first solenoid valve is connected to the first pipeline and is used to block or connect the main pressure building unit and the first wheel cylinder. One end of the second pipeline is connected to the oil reservoir, and the other end of the second pipeline is connected to the first wheel cylinder. The pumping mechanism, the first check valve, and the second check valve are connected to the second pipeline. The first check valve is located near the oil inlet of the pumping mechanism, and the second check valve is located near the oil outlet of the pumping mechanism. The first check valve and the second check valve are used to prevent brake fluid from flowing from the first wheel cylinder to the oil reservoir. One end of the third pipeline is connected to the second pipeline between the oil reservoir and the first one-way valve, and the other end of the third pipeline is connected to the first wheel cylinder. The second solenoid valve is connected to the third pipeline and is used to block or connect the oil reservoir and the first wheel cylinder. The control unit is electrically connected to the first solenoid valve, the second solenoid valve, and the liquid extraction mechanism, respectively. The control unit is used to control the first solenoid valve, the second solenoid valve, and the liquid extraction mechanism to open or close. The active pressure building and regulation control system includes an ABS control mode, which includes a first cylinder depressurization mode, a first cylinder pressure holding mode, and a first cylinder boosting mode. The first wheel cylinder depressurization mode is that the control unit controls the first solenoid valve to close and the second solenoid valve to open, so that brake fluid is released from the first wheel cylinder into the reservoir. The first wheel cylinder pressure holding mode is that the control unit controls both the first solenoid valve and the second solenoid valve to be closed; The first wheel cylinder boosting mode is that the control unit controls both the first and second solenoid valves to close and controls the pumping mechanism to draw brake fluid into the first wheel cylinder.

2. The active pressure build-up and regulation control system as described in claim 1, characterized in that, The active pressure building and regulating control system further includes a first accumulator, which is connected to the second pipeline between the oil reservoir and the first one-way valve, and the third pipeline is connected to the first accumulator.

3. The active pressure build-up and regulation control system as described in claim 1, characterized in that, The active pressure building and regulation control system also includes a hydraulic sensor, which is connected to the first pipeline between the first solenoid valve and the main pressure building unit. The hydraulic sensor is electrically connected to the control unit, and the control unit adjusts the current required by the first solenoid valve to seal the first wheel cylinder based on the hydraulic pressure collected by the hydraulic sensor.

4. The active pressure build-up and regulation control system as described in claim 1, characterized in that, The active pressure building and regulation control system further includes a first return pipe and a third one-way valve. One end of the first return pipe is connected to the first pipeline between the first solenoid valve and the main pressure building unit, and the other end of the first return pipe is connected to the first pipeline between the first solenoid valve and the first wheel cylinder. The third one-way valve is connected to the first return pipe and is used to prevent brake fluid from flowing from the first wheel cylinder to the main pressure building unit.

5. The active pressure build-up and regulation control system as described in claim 1, characterized in that, The liquid pumping mechanism includes a motor and a first liquid pump. The first output shaft of the motor is connected to the first liquid pump, and the first liquid pump is connected to the second pipeline. The first check valve is located near the oil inlet of the first liquid pump, and the second check valve is located near the oil outlet of the first liquid pump.

6. The active pressure build-up and regulation control system as described in claim 5, characterized in that, The active pressure building and regulating control system also includes a third solenoid valve, a fourth solenoid valve, a fourth check valve, a fifth check valve, a fourth pipeline, a fifth pipeline, and a sixth pipeline. One end of the fourth pipeline is connected to the main pressure building unit, and the other end of the fourth pipeline is connected to the second wheel cylinder. The third solenoid valve is connected to the fourth pipeline and is used to block or connect the main pressure building unit and the second wheel cylinder. One end of the fifth pipeline is connected to the oil reservoir, and the other end of the fifth pipeline is connected to the second wheel cylinder; the pumping mechanism also includes a second pump, and the second output shaft of the motor is connected to the second pump; the second pump, the fourth check valve, and the fifth check valve are connected to the fifth pipeline, the fourth check valve is located near the oil inlet of the second pump, and the fifth check valve is located near the oil outlet of the second pump, and the fourth and fifth check valves are used to prevent brake fluid from flowing from the second wheel cylinder to the oil reservoir; One end of the sixth pipeline is connected to the fifth pipeline between the oil reservoir and the fourth check valve, and the other end of the sixth pipeline is connected to the second wheel cylinder. The fourth solenoid valve is connected to the sixth pipeline and is used to block or connect the oil reservoir and the second wheel cylinder.

7. The active pressure build-up and regulation control system as described in claim 6, characterized in that, The active pressure building and regulating control system also includes a second accumulator, which is connected to the fifth pipeline between the oil reservoir and the third check valve, and the sixth pipeline is connected to the second accumulator.

8. The active pressure build-up and regulation control system as described in claim 6, characterized in that, The active pressure building and regulating control system further includes a second return pipe and a sixth one-way valve. One end of the second return pipe is connected to the fourth pipeline between the third solenoid valve and the main pressure building unit, and the other end of the second return pipe is connected to the fourth pipeline between the third solenoid valve and the second wheel cylinder. The sixth one-way valve is connected to the second return pipe and is used to prevent brake fluid from flowing from the second wheel cylinder to the main pressure building unit.

9. A vehicle, characterized in that, The active pressure build-up and regulation control system as described in any one of claims 1 to 8.

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