Vacuum boost system and vehicle

Abstract

The present disclosure relates to a vacuum boost system and a vehicle, the vacuum boost system comprising a vacuum booster, a high-pressure tank, a vacuum tank, a first switch valve, a second switch valve and a boost push rod, the vacuum booster is used to be installed between the brake pedal and the brake master cylinder of the vehicle, a cavity is formed inside the vacuum booster, a movable partition is arranged in the cavity, the partition separates the cavity into a first cavity and a second cavity, the first cavity is connected to the vacuum tank through a pipeline, the second cavity is connected to the high-pressure tank through a pipeline, the high-pressure tank is used to provide a preset air pressure to the second cavity, the first switch valve is arranged on the partition, and is used to control the connection or isolation of the first cavity and the second cavity, the second switch valve is arranged on the communication path between the second cavity and the high-pressure tank, and is used to control the connection or isolation of the second cavity and the high-pressure tank. Providing the preset air pressure by the high-pressure tank can protect the vacuum boost system from the influence of the ambient air pressure, and can provide reliable boosting for the braking system of the vehicle.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle manufacturing technology, and in particular, to a vacuum boosting system and a vehicle. Background Art

[0002] The vacuum boost system is the most commonly used boost system for vehicle braking systems. The principle of the vacuum boost system is to form a pressure difference between the vacuum state in the booster and the atmospheric pressure, thereby providing brake assistance. Generally, the vacuum state in the booster is provided by the vehicle engine when it inhales air. However, electric vehicles do not have engines, so they can only use electric vacuum pumps to generate negative pressure. At high altitudes, the atmospheric pressure is lower than that in plains. If you want to use the vacuum pump to draw a vacuum state with a large difference in pressure from the atmospheric pressure at high altitudes, the vacuum pump needs to work longer, resulting in a reduced life of the vacuum pump. If you want to ensure the life of the vacuum pump, the difference between the vacuum state and the atmospheric pressure is too small, and the boost effect is poor. Summary of the invention

[0003] The purpose of the present disclosure is to provide a vacuum power-assisting system and a vehicle, wherein the vacuum power-assisting system is not affected by air pressure in high-altitude areas, thereby ensuring the power-assisting effect.

[0004] In order to achieve the above-mentioned objectives, the present disclosure provides a vacuum booster system, including a vacuum booster, a vacuum tank, a high-pressure tank, a first switch valve, a second switch valve and a booster push rod, the vacuum booster is used to be installed between the brake pedal and the brake master cylinder of the vehicle, a cavity is formed inside the vacuum booster, a movable partition is arranged in the cavity, the partition divides the cavity into a first chamber and a second chamber, the first chamber is connected to the vacuum tank through a pipeline, the second chamber is connected to the high-pressure tank through a pipeline, the high-pressure tank is used to provide a preset air pressure to the second chamber, the first switch valve is arranged on the partition, and is used to control the connection or isolation between the first chamber and the second chamber, the second switch valve is arranged on the communication path between the second chamber and the high-pressure tank, and is used to control the connection or isolation between the second chamber and the high-pressure tank, one end of the booster push rod is connected to the partition, and the other end is used to be connected to the brake pedal.

[0005] Optionally, the vacuum boost system further includes a vacuum pump, which is connected to the vacuum tank and the high-pressure tank respectively through pipelines, so that the vacuum pump can pump the gas in the vacuum tank into the high-pressure tank.

[0006] Optionally, the vacuum pump is a fully sealed electric vacuum pump.

[0007] Optionally, the second switch valve is arranged on a side wall of the second chamber.

[0008] Optionally, the first switch valve and the second switch valve are configured to be linked, and the first switch valve is closed when the second switch valve is opened.

[0009] Optionally, the vacuum booster system also includes a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged on the vacuum booster to detect the air pressure in the first chamber, and the second pressure sensor is arranged on a pipeline connected to the high-pressure tank to detect the air pressure in the high-pressure tank.

[0010] Optionally, the vacuum boost system further includes an atmospheric air supply pipe and a one-way valve, one end of the atmospheric air supply pipe is connected to the vacuum pump, and the other end is connected to the atmosphere, and the one-way valve is arranged on the atmospheric air supply pipe.

[0011] Optionally, the vacuum booster further comprises a return drive member disposed in the first chamber or the second chamber, and the return drive member is used for driving the partition to move in a direction to increase the volume of the first chamber.

[0012] Optionally, the return driving member is an elastic member, the elastic member is arranged in the first cavity, one end of the elastic member is connected to the partition plate, and the other end is connected to the inner wall of the first cavity.

[0013] As another aspect of the present disclosure, the present disclosure also provides a vehicle, comprising the above-mentioned vacuum boosting system.

[0014] Through the above technical solution, a separate high-pressure tank is arranged in the vacuum boosting system, and a preset air pressure is provided by the high-pressure tank, so that the air pressure in the second chamber of the vacuum booster connected to the vacuum tank will not be insufficient due to changes in altitude, whether in plain areas or in plateau areas. The boosting system can have sufficient air pressure supply in the second chamber even in high-altitude and low-pressure areas, so that the vacuum boosting system will not be affected by the ambient air pressure, thereby providing sufficient pressure difference, for example, achieving the same boosting effect as in plain areas, providing reliable and stable boosting for the vehicle's braking system, and ensuring the braking boosting effect.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of a vacuum assist system provided in one embodiment of the present disclosure.

[0018] Description of Reference Numerals

[0019] 1-vacuum booster; 2-vacuum tank; 3-high-pressure tank; 4-first switch valve; 5-second switch valve; 6-partition; 7-first chamber; 8-second chamber; 9-vacuum pump; 10-first pressure sensor; 11-second pressure sensor; 12-atmospheric air supply pipe; 13-check valve. DETAILED DESCRIPTION

[0020] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0021] In the present disclosure, unless otherwise specified, directional terms such as "upper, lower, left, right" are generally defined based on the drawing direction of the corresponding drawings. "Inside and outside" refer to the inside and outside of the contour of the corresponding component.

[0022] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0023] like Figure 1 As shown, the present disclosure provides a vacuum boosting system, which includes a vacuum booster 1, a high-pressure tank 3, a vacuum tank 2, a first switch valve 4, a second switch valve 5 and a booster push rod (not shown). The vacuum booster 1 is used to be installed between the brake pedal and the brake master cylinder of the vehicle, that is, the vacuum boosting system is used to assist the braking of the vehicle. A cavity is formed inside the vacuum booster 1, and a movable partition 6 is arranged in the cavity. The partition 6 divides the cavity into a first cavity 7 and a second cavity 8. The first cavity 7 is connected to the vacuum tank 2 through a pipeline, and the second cavity 8 is connected to the high-pressure tank 3 through a pipeline. The high-pressure tank 3 is used to provide a preset air pressure to the second cavity 8. The first switch valve 4 is arranged on the partition 6, which is used to control the connection or isolation of the first cavity 7 and the second cavity 8. The second switch valve 5 is arranged on the communication path between the second cavity 8 and the high-pressure tank 3, which is used to control the connection or isolation of the second cavity 8 and the high-pressure tank 3; one end of the booster push rod is connected to the partition 6, and the other end is used to connect to the brake pedal.

[0024] In the vacuum assist system provided in the present invention, the working principle of the vacuum assist system is roughly as follows: when the vacuum assist system is on standby, the first switch valve 4 is opened, the second switch valve 5 is closed, the first chamber 7, the second chamber 8 and the vacuum tank 2 are in a connected state, and the air pressure in the first chamber 7, the second chamber 8 and the vacuum tank 2 is the same; when the vacuum assist system is working, the first switch valve 4 is closed, the second switch valve 5 is opened, the gas in the high-pressure tank 3 enters the second chamber 8, and the first chamber 7 maintains the same air pressure as the vacuum tank 2. At this time, since the air pressure in the second chamber 8 is higher than the air pressure in the first chamber 7, the partition 6 can be pushed to move toward the direction of the first chamber 7, and the partition 6 drives the parts that need assistance, thereby providing assistance.

[0025] Since one end of the booster push rod is connected to the partition 6, as the driver steps on the brake pedal, the first switch valve 4 is closed, the second switch valve 5 is opened, and an air pressure difference is formed between the first chamber 7 and the second chamber 8. The partition 6 moves toward the first chamber 7 under the action of the air pressure to assist in starting the mechanical brake system of the vehicle. Optionally, the control system of the vehicle can be used to respond to the force applied by the booster push rod on the partition 6, so as to open the second switch valve 5 in time, close the first switch valve 4, and control the opening of the vacuum boost system to assist the braking of the vehicle.

[0026] Through the above technical solution, a separate high-pressure tank 3 is arranged in the vacuum boosting system, and a preset air pressure is provided by the high-pressure tank 3, so that no matter in plain areas or in plateau areas, the air pressure in the second chamber 8 of the vacuum booster 1 connected to the high-pressure tank 3 will not be insufficient due to changes in altitude, so that the boosting system can have sufficient air pressure supply in the second chamber 8 even in high-altitude and low-pressure areas, so that the vacuum boosting system is not affected by the ambient air pressure, thereby providing sufficient pressure difference, for example, achieving the same boosting effect as in plain areas, providing reliable and stable boosting for the vehicle's braking system, and ensuring the braking boosting effect.

[0027] It should be noted that, in the present disclosure, the gas in the high-pressure tank 3 may be gas pre-installed in a plain area, and the preset gas pressure in the high-pressure tank 3 may be any appropriate value, for example, the preset gas pressure is roughly equal to the standard atmospheric pressure.

[0028] Optionally, as an embodiment of the present disclosure, Figure 1As shown, the vacuum boosting system also includes a vacuum pump 9, which is connected to the vacuum tank 2 and the high-pressure tank 3 through pipelines, so that the vacuum pump 9 can pump the gas in the vacuum tank 2 into the high-pressure tank 3. During the use of the boosting system, the pressurized gas in the high-pressure tank 3 enters the second chamber 8 as the second valve is opened, and after the boosting is completed, it enters the first chamber 7 as the first switch valve 4 is opened, and the cycle is repeated. Therefore, the air pressure between the first chamber 7 and the second chamber 8 is constantly approaching each other on average. After a period of use, the air pressure in the high-pressure tank 3 and the air pressure in the vacuum tank 2 will gradually approach each other, so that it is impossible to provide sufficient pressure difference for boosting. At this time, close the second switch valve 5, open the first switch valve 4, start the vacuum pump 9, extract the gas in the vacuum tank 2 from the vacuum tank 2 and re-inject it into the high-pressure tank 3, restore the air pressure difference between the high-pressure tank 3 and the vacuum tank 2, and restore the pressure difference between the first chamber 7 and the second chamber 8 of the vacuum booster 1, so as to ensure the boosting effect of the vacuum boosting system.

[0029] Optionally, as an embodiment of the present disclosure, the vacuum pump 9 is a fully sealed electric vacuum pump 9. In the present disclosure, the air inlet of the vacuum pump 9 is connected to the vacuum tank 2, and the air outlet of the vacuum pump 9 is connected to the high-pressure tank 3. When the vacuum pump 9 is started, gas exchange only occurs within the system, and the air drawn out from the vacuum tank 2 enters the high-pressure tank 3, and no gas exchange occurs with the atmosphere. Therefore, it will not be affected by changes in atmospheric pressure. When the atmospheric pressure decreases, a certain air pressure is always maintained in the vacuum assist system, and the working time of the vacuum pump 9 will not be extended due to the thin external air pressure. While increasing the working life of the vacuum pump 9, the assist effect of the vacuum assist system is also guaranteed.

[0030] Optionally, as an embodiment of the present disclosure, Figure 1 As shown, the second switch valve 5 is arranged on the side wall of the second chamber 8. Arranging the second switch valve 5 on the side wall of the second chamber 8 can reduce the connection part between the second switch valve 5 and the pipeline, and can improve the integration level of the whole system.

[0031] Here, it should be noted that in other embodiments of the present disclosure, the second switch valve 5 can also be arranged on the pipeline connecting the second chamber 8 and the high-pressure tank 3, or the second switch valve 5 can also be set on the high-pressure tank 3, for example, on the wall of the high-pressure tank 3, and the present disclosure does not limit this.

[0032] Optionally, as an embodiment of the present disclosure, the first switch valve 4 and the second switch valve 5 are configured to be interlocked, and the first switch valve 4 is closed when the second switch valve 5 is opened. When the vacuum boost system is working, it is necessary to open the second switch valve 5 to connect the high-pressure tank 3, and at the same time close the first switch valve 4 so that the first chamber 7 and the second chamber 8 form independent chambers, and the air pressure in the second chamber 8 pushes the partition 6 to move to provide assistance. Configuring the first switch valve 4 and the second switch valve 5 to be interlocked can simultaneously close the first switch valve 4 and open the second switch valve 5 in one action, which simplifies the structure of the vacuum booster and improves the response speed of the vacuum boost system.

[0033] It is understood that in other embodiments of the present disclosure, the first switch valve 4 and the second switch valve 5 can be controlled separately, that is, opened or closed independently.

[0034] The present disclosure does not limit the specific types of the first switch valve 4 and the second switch valve 5. Optionally, in an embodiment of the present disclosure, the first switch valve 4 and the second switch valve 5 may both be solenoid valves.

[0035] In order to detect the pressure value in the vacuum boost system, optionally, as an embodiment of the present disclosure, as Figure 1 As shown, the vacuum booster system further includes a first pressure sensor 10 and a second pressure sensor 11. The first pressure sensor 10 is arranged on the vacuum booster 1. The detection end of the first pressure sensor 10 is connected to the first chamber 7 to detect the air pressure in the first chamber 7. The second pressure sensor 11 is arranged on the pipeline connected to the high-pressure tank 3. The detection end of the second pressure sensor 11 is connected to the high-pressure tank 3 to detect the air pressure in the high-pressure tank 3. The first pressure sensor 10 connected to the first chamber 7 and the second pressure sensor 11 connected to the high-pressure tank 3 are arranged to detect the pressure value in the tank. After that, the detection results obtained by the first pressure sensor 10 and the second pressure sensor 11 are compared to obtain the current pressure difference between the vacuum tank 2 and the high-pressure tank 3, so as to obtain the pressure difference between the first chamber 7 and the second chamber 8. In order to obtain the best booster effect, the pressure difference is generally 60-80KPa. The sensor can detect the pressure difference between the vacuum tank 2 and the high-pressure tank 3 in real time to ensure that the pressure difference is within the ideal range and maintain the best booster effect.

[0036] Optionally, as an embodiment of the present disclosure, Figure 1As shown, the vacuum boost system may also include an atmospheric air supply pipe 12 and a one-way valve 13. One end of the atmospheric air supply pipe 12 is connected to the vacuum pump 9, and the other end is connected to the atmosphere. The one-way valve 13 is arranged on the atmospheric air supply pipe 12. During the use of the vacuum boost system, since the flow of gas and the connection between the pipeline and the cavity cannot be absolutely sealed, after a period of use, there will be a shortage of gas in the system, causing the overall air pressure in the system to decrease, and it is impossible to provide sufficient pressure for the operation of the vacuum boost system. At this time, the one-way valve 13 is opened, and the vacuum boost system and the atmosphere are connected through the atmospheric air supply pipe 12 to replenish air for the vacuum boost system. At the same time, the setting of the one-way valve 13 can also ensure that the gas only flows in one direction toward the vacuum boost system, and the gas will not overflow outward, thereby ensuring a certain degree of sealing of the vacuum pump 9 and the vacuum boost system, thereby ensuring the pressure in the vacuum boost system.

[0037] Optionally, as a real-time method of the present disclosure, the vacuum booster 1 further includes a return drive (not shown), which can be disposed in the first chamber 7 or the second chamber 8 of the vacuum booster 1, and is used to drive the partition 6 to move in a direction that increases the volume of the first chamber 7. When the partition 6 completes the boosting and needs to return to the initial position from the position close to the vacuum pump 9, for example, when it returns to the middle of the first chamber 7 and the second chamber 8, the return drive can provide a return force to facilitate the partition 6 to perform the next boosting.

[0038] The present disclosure does not limit the specific structure of the return drive member, as long as the partition 6 can be returned. Optionally, in one embodiment of the present disclosure, the return drive member may be an elastic member, such as a spring or a spring. Optionally, the elastic member may be arranged in the first cavity 7, one end of the elastic member is connected to the partition 6, and the other end is connected to the inner wall of the first cavity 7, and when the partition 6 is in the initial position (the position when the vacuum assist system is not started), the elastic member may be in the initial length. In this way, when the partition 6 moves toward the direction close to the vacuum pump 9, the elastic member is compressed at the same time to store energy for the elastic member. When the assist ends, the elastic member releases the stored energy to push the partition 6 back to the initial position.

[0039] In another embodiment of the present disclosure, the return drive member can also be a linear motor, which can be installed on the side wall of the first chamber 7 away from the partition 6. Before the vacuum booster 1 performs the assisting action, the push rod of the linear motor is separated from the partition 6 by a certain distance. After the assisting action is performed, the push rod of the linear motor can be used to push the partition 6 back to its initial position for the next assisting action.

[0040] As another aspect of the present disclosure, the present disclosure also provides a vehicle, which includes the above-mentioned vacuum booster system. In the vehicle, the vacuum booster 1 is installed between the brake pedal and the brake master cylinder of the vehicle, and the brake pedal is connected to the partition 6 of the vacuum booster 1 through a booster push rod. It can be seen from the above discussion that the vacuum booster system can be used to assist the braking of the vehicle.

[0041] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0043] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A vacuum boost system, characterized in that: The invention comprises a vacuum booster (1), a vacuum tank (2), a high-pressure tank (3), a first switch valve (4), a second switch valve (5) and a booster push rod. The vacuum booster (1) is used to be installed between a brake pedal and a brake master cylinder of a vehicle. A cavity is formed inside the vacuum booster (1). A movable partition (6) is arranged in the cavity. The partition (6) divides the cavity into a first cavity (7) and a second cavity (8). The first cavity (7) is connected to the vacuum tank (2) through a pipeline. The second cavity (8) is connected to the high-pressure tank (2) through a pipeline. The first switch valve (4) is arranged on the partition plate (6) and is used to control the connection or isolation between the first chamber (7) and the second chamber (8); the second switch valve (5) is arranged on the communication path between the second chamber (8) and the high-pressure tank (3) and is used to control the connection or isolation between the second chamber (8) and the high-pressure tank (3); one end of the booster push rod is connected to the partition plate (6), and the other end is used to be connected to the brake pedal; The vacuum boost system further comprises a vacuum pump (9), wherein the vacuum pump (9) is connected to the vacuum tank (2) and the high-pressure tank (3) respectively through pipelines, so that the vacuum pump (9) can pump the gas in the vacuum tank (2) into the high-pressure tank (3); The air inlet of the vacuum pump (9) is connected to the vacuum tank (2), and the air outlet of the vacuum pump (9) is connected to the high-pressure tank (3). When the vacuum pump (9) is started, gas exchange only occurs within the vacuum boosting system, and the air extracted from the vacuum tank (2) enters the high-pressure tank (3), without gas exchange with the atmosphere.

2. The vacuum boost system according to claim 1, characterized in that: The vacuum pump (9) is a fully sealed electric vacuum pump (9).

3. The vacuum boost system according to claim 1, characterized in that: The second switching valve (5) is arranged on a side wall of the second chamber (8).

4. The vacuum boost system according to any one of claims 1 to 3, characterized in that: The first switch valve (4) and the second switch valve (5) are configured to be linked, and the first switch valve (4) is closed when the second switch valve (5) is opened.

5. The vacuum boost system according to any one of claims 1 to 3, characterized in that: The vacuum booster system further comprises a first pressure sensor (10) and a second pressure sensor (11); the first pressure sensor (10) is arranged on the vacuum booster (1) for detecting the air pressure in the first chamber (7); the second pressure sensor (11) is arranged on a pipeline connected to the high-pressure tank (3) for detecting the air pressure in the high-pressure tank (3).

6. The vacuum boost system according to any one of claims 1 to 3, characterized in that: The vacuum boosting system further comprises an atmospheric air supply pipe (12) and a one-way valve (13); one end of the atmospheric air supply pipe (12) is connected to the vacuum pump (9) and the other end is connected to the atmosphere; the one-way valve (13) is arranged on the atmospheric air supply pipe (12).

7. The vacuum boost system according to claim 1, characterized in that: The vacuum booster (1) further comprises a return drive member arranged in the first chamber (7) or the second chamber (8), the return drive member being used to drive the partition plate (6) to move in a direction that increases the volume of the first chamber (7).

8. The vacuum boost system according to claim 7, characterized in that: The return drive member is an elastic member, which is arranged in the first cavity (7), one end of the elastic member is connected to the partition plate (6), and the other end is connected to the inner wall of the first cavity (7).

9. A vehicle, characterized in that: A vacuum assist system comprising any one of claims 1-8.

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