Air suspension height level adjustment method and system

Abstract

The present application relates to an air suspension height level adjustment method and system, belonging to the field of automobile technology, and the air suspension height level adjustment method comprises the following steps: the vehicle is provided with a plurality of height levels for adjusting the vehicle body height; an intermediate target level is provided in the interval of each height level; the target height level and the current vehicle body height level are obtained; the intermediate target level between the target height level and the current vehicle body height level is selected; and the air springs of the front axle and the rear axle are adjusted to the intermediate target level. Therefore, when the target height level is re-determined, with the switching of the target height level, the direction can be immediately switched at the position of the intermediate target level, so as to switch to descent during the ascent process and switch to ascent during the descent process, without waiting until the previously determined target height level is completed before adjusting and switching, thereby accelerating the response speed of the height level adjustment and improving the driving experience of the driver.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a method and system for adjusting the height level of an air suspension. Background Art

[0002] As a vehicle suspension configuration, air suspension changes the height and hardness of the vehicle by compressing air and adjusting the air pressure, which can ensure the vehicle's passability and comfort under different road conditions. As air suspension becomes more and more popular in the automotive industry, the adjustment method of air suspension has attracted much attention.

[0003] In the related technology, different OEMs have different adjustment logics on how to perform air suspension adjustment. For example, the common air suspension height adjustment on the market is divided into levels, such as lowest, low, medium, high, and highest, which correspond to different driving modes respectively. As the driver switches the driving mode on the screen or other height level adjustment functions are automatically triggered, the air suspension will adjust the height to the corresponding height level.

[0004] However, the above adjustment logic cannot immediately perform switching adjustment as the target altitude level switches, and needs to wait until the current adjustment target is completed before adjusting and switching, resulting in a slow response speed of altitude level adjustment. Summary of the invention

[0005] The embodiments of the present application provide an air suspension height level adjustment method and system to solve the problem in the related art that as the target height level is switched, the switching adjustment cannot be performed immediately, and the adjustment switch needs to wait until the current adjustment target is completed, resulting in a slow response speed of the height level adjustment.

[0006] A first aspect of an embodiment of the present application provides a method for adjusting the height level of an air suspension, the method comprising the following steps:

[0007] S1. The vehicle is provided with a plurality of height levels for adjusting the vehicle height;

[0008] S2. Intermediate target levels are set in each altitude level interval;

[0009] S3, obtaining the target height level and the current vehicle height level;

[0010] S4, selecting an intermediate target level between the target height level and the current vehicle height level;

[0011] S5, adjust the air springs of the front and rear axles to the middle target level;

[0012] S6, determine whether the target altitude level has changed, if not, execute step S7, if changed, execute step S8;

[0013] S7. Adjust the air springs of the front and rear axles to the target height levels;

[0014] S8. Adjust the air springs of the front and rear axles to the target height level after the change.

[0015] In some embodiments, each of the height level intervals is provided with a plurality of intermediate target levels.

[0016] In some embodiments, step S4 specifically includes the following steps:

[0017] The absolute values ​​of the differences between the heights corresponding to the multiple intermediate target levels and the height corresponding to the current vehicle body height level are compared, and the corresponding intermediate target level is selected according to the minimum value among the absolute values.

[0018] In some embodiments, step S7 specifically includes the following steps:

[0019] If there is an intermediate target level between the current vehicle height level and the target height level, execute step S4;

[0020] If there is no intermediate target level between the current vehicle body height level and the target height level, the air springs of the front axle and the rear axle are adjusted to the target height level.

[0021] In some embodiments, step S8 specifically includes the following steps:

[0022] If there is an intermediate target level between the current vehicle height level and the target height level, execute step S4;

[0023] If there is no intermediate target level between the current vehicle body height level and the target height level, the air springs of the front axle and the rear axle are adjusted to the target height level after the change.

[0024] In some embodiments, step S4 further includes:

[0025] Compare the height corresponding to the target height level with the height corresponding to the current vehicle body height level to determine the suspension adjustment direction;

[0026] When the height corresponding to the target height level is greater than the height corresponding to the current vehicle body height level, the suspension adjustment direction is rising; when the height corresponding to the target height level is less than the height corresponding to the current vehicle body height level, the suspension adjustment direction is falling.

[0027] In some embodiments, step S5 specifically includes:

[0028] The front axle air spring height and the rear axle air spring height are adjusted respectively, and the adjusted heights are the difference between the height corresponding to the intermediate target level and the current front axle air spring height, and the difference between the height corresponding to the intermediate target level and the current rear axle air spring height.

[0029] A second aspect of an embodiment of the present application provides an air suspension height level adjustment system, comprising:

[0030] a suspension controller for storing a plurality of height levels and intermediate target levels for adjusting vehicle height;

[0031] The suspension controller is used to obtain a target height level and a current vehicle body height level detected by a height sensor and select an intermediate target level between the target height level and the current vehicle body height level;

[0032] an actuator for adjusting the air springs of both the front and rear axles to an intermediate target level;

[0033] The suspension controller is used to determine whether the target height level has changed. If not, the actuator adjusts the air springs of the front axle and the rear axle to the target height level; if changed, the actuator adjusts the air springs of the front axle and the rear axle to the target height level after the change.

[0034] In some embodiments, each of the height level intervals of the suspension controller is provided with a plurality of the intermediate target levels.

[0035] In some embodiments, the suspension controller is used to compare the absolute values ​​of the differences between the heights corresponding to the multiple intermediate target levels and the height corresponding to the current vehicle body height level, and select the corresponding intermediate target level based on the minimum value among the absolute values.

[0036] The beneficial effects of the technical solution provided by this application include:

[0037] The embodiment of the present application provides a method and system for adjusting the height level of an air suspension, wherein the method comprises the following steps:

[0038] S1. The vehicle is provided with a plurality of height levels for adjusting the vehicle height;

[0039] S2. Intermediate target levels are set in each altitude level interval;

[0040] S3, obtaining the target height level and the current vehicle height level;

[0041] S4, selecting an intermediate target level between the target height level and the current vehicle height level;

[0042] S5, adjust the air springs of the front and rear axles to the middle target level;

[0043] S6, determine whether the target altitude level has changed, if not, execute step S7, if changed, execute step S8;

[0044] S7. Adjust the air springs of the front and rear axles to the target height levels;

[0045] S8. Adjust the air springs of the front and rear axles to the target height level after the change.

[0046] Therefore, when the target height level is redetermined, as the target height level switches, the directional control can be immediately performed at the intermediate target level position to switch from descending during ascent to ascending during descent. There is no need to wait until the previously determined target height level is completed before adjusting and switching, thereby speeding up the response speed of the height level adjustment and improving the driving experience of the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 A schematic diagram of a flow chart of a method for adjusting the height level of an air suspension provided in one embodiment of the present application;

[0049] Figure 2 A schematic flow chart of a method for adjusting the height level of an air suspension provided in another embodiment of the present application;

[0050] Figure 3 A schematic structural diagram of an air suspension height level adjustment system provided for one embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0052] The embodiments of the present application provide an air suspension height level adjustment method and system, which can solve the problem in the related art that as the target height level is switched, the switching adjustment cannot be performed immediately, and the adjustment switching needs to wait until the current adjustment target is completed, resulting in a slow response speed of the height level adjustment.

[0053] See also Figures 1 to 2 As shown, a first aspect of an embodiment of the present application provides a method for adjusting the height level of an air suspension, the method comprising the following steps:

[0054] S1. The vehicle is provided with a plurality of height levels for adjusting the vehicle height;

[0055] S2. Intermediate target levels are set in each altitude level interval;

[0056] S3, obtaining the target height level and the current vehicle height level;

[0057] S4, selecting an intermediate target level between the target height level and the current vehicle height level;

[0058] S5, adjust the air springs of the front and rear axles to the middle target level;

[0059] S6, determine whether the target altitude level has changed, if not, execute step S7, if changed, execute step S8;

[0060] S7. Adjust the air springs of the front and rear axles to the target height levels;

[0061] S8. Adjust the air springs of the front and rear axles to the target height level after the change.

[0062] The multiple height levels for adjusting the vehicle body height and the intermediate target levels in each height level interval in the embodiment of the present application are all preset and stored in the vehicle system, such as the suspension controller. At the same time, the height levels and intermediate target levels for adjusting the vehicle body height have corresponding air suspension heights, that is, the heights of the front and rear axle air springs.

[0063] It should be noted that the height level and the intermediate target level used to adjust the vehicle height have corresponding height values; the target height level can be the height level selected by the driver or the height level triggered by the suspension function according to the road conditions, or the height level corresponding to the selected driving mode.

[0064] For example, the corresponding air suspension heights are different in different existing driving modes. The driving modes are defined as sports mode, comfort mode, and off-road mode. The corresponding air suspension height levels are S, C, and O, and the corresponding heights are h1, h2, and h3. After the driver selects the driving mode, it is equivalent to the driver selecting the target height level. Then, the air spring height is adjusted to the target air suspension height level. That is, the process of adjusting the air suspension height is divided into:

[0065]

[0066] When the height adjustment direction is ascending, and the current height and the target height meet the requirements of each scenario, enter Case 1, Case 2, and Case 3 respectively;

[0067] When the height adjustment direction is descending, and the current height and the target adjustment height meet the requirements of each scene, enter Case 4, Case 5, and Case 6 respectively.

[0068] It should be noted that the present application sets an intermediate target level in the existing height level interval. As the target height level switches, directional adjustment can be immediately performed at the position of the intermediate target level to achieve switching from descending during the ascent and from ascending during the descent. There is no need to wait until the previously determined target height level is completed before adjusting and switching, thereby speeding up the response speed of the height level adjustment and improving the driving experience of the driver.

[0069] For example, assuming that the current altitude is h2, the altitude level selected by the driver corresponds to the altitude h3, and the altitude value corresponding to the intermediate target level between h2 and h3 is h tar , combined with the current height h2, the height of the left front air spring is h FL , the height of the right front air spring is h FR , the height of the left rear air spring is h RL , the height of the right rear air spring is h RR ;

[0070] At this time, the suspension controller calculates the height difference between the four air springs on the front and rear axles.

[0071] ΔHFL=hFL-ht ar , ΔHFR=hFR-ht ar , ΔHRL=hRL-ht ar , ΔHRR=hRR-ht ar , combined with the current vehicle height h2 and the target height h3, enter height adjustment Case 2 and adjust the height difference ΔH FL , ΔH FR , ΔH RL , ΔHRR After adjusting to the set error range of 2mm, the suspension controller obtains the vehicle height through the height sensor and internally sends a signal that the intermediate target level adjustment is completed;

[0072] When the air suspension height is adjusted from the current height of h2 to h tar During the process, if the driver reselects the height level, and the height corresponding to the reselected height level is h1, after the intermediate target level is adjusted, the suspension controller determines that the target height has changed, and thus combines the current vehicle height h tar and target height h1, jump out of height adjustment Case 2, calculate the height difference of the four air springs of the front and rear axles, and adjust the air suspension height to the height of h1, so as to switch to descend during the ascending process, and there is no need to adjust and switch after Case 2 is completed, thereby speeding up the response speed of height level adjustment;

[0073] If the driver does not reselect the height level, after the intermediate target level adjustment is completed, the suspension controller determines that the target height has not changed, and thus combines the current vehicle height h tar If the target height is h3, continue with height adjustment Case 2, calculate the height difference of the four air springs on the front and rear axles, and adjust the air suspension height to the height of h2.

[0074] For example, assuming that the current altitude is h2, the altitude level selected by the driver corresponds to the altitude h1, and the altitude value corresponding to the intermediate target level between h1 and h2 is h tar ', combined with the current height h2, the height of the left front air spring is h FL , the height of the right front air spring is h FR , the height of the left rear air spring is h RL , the height of the right rear air spring is h RR ;

[0075] At this time, the suspension controller calculates the height difference between the four air springs on the front and rear axles.

[0076] ΔHFL=hFL-h tar ', ΔHFR = hFR-h tar ', ΔHRL = ​​hRL - h tar ', ΔHRR=hRR-h tar ', combined with the current vehicle height h2 and the target height h1, enter height adjustment Case 5, and adjust the height difference ΔH FL , ΔH FR , ΔH RL , ΔH RRAfter adjusting to the set error range of 2mm, the suspension controller obtains the vehicle height through the height sensor and internally sends a signal that the intermediate target level adjustment is completed;

[0077] When the air suspension height is adjusted from the current height of h2 to h tar ', if the driver reselects the height level, and the height corresponding to the reselected height level is h3, after the intermediate target level adjustment is completed, the suspension controller determines that the target height has changed, and thus combines the current vehicle height h tar and target height h3, jump out of height adjustment Case 5, calculate the height difference of the four air springs of the front and rear axles, and adjust the air suspension height to the height of h3, so as to switch to ascending during the descending process, and there is no need to adjust and switch after Case 5 is completed, thereby speeding up the height level adjustment response speed;

[0078] If the driver does not reselect the height level, after the intermediate target level adjustment is completed, the suspension controller determines that the target height has not changed, and thus combines the current vehicle height h tar ' and the target height h1, then continue with height adjustment Case5, calculate the height difference of the four air springs on the front and rear axles, and adjust the air suspension height to the height of h1.

[0079] It should be noted that for adjusting the height of the vehicle's air suspension, a step-by-step adjustment method is adopted, which is to first raise the rear axle and then raise the front axle, or first lower the front axle and then lower the rear axle.

[0080] In some alternative embodiments: See Figures 1 to 2 As shown, an embodiment of the present application provides an air suspension height level adjustment method, wherein each height level interval of the air suspension height level adjustment method is provided with a plurality of intermediate target levels;

[0081] Step S4 specifically includes the following steps:

[0082] Compare the absolute values ​​of the differences between the heights corresponding to the multiple intermediate target levels and the height corresponding to the current vehicle body height level, and select the corresponding intermediate target level according to the minimum value among the absolute values;

[0083] Step S7 specifically includes the following steps:

[0084] If there is an intermediate target level between the current vehicle height level and the target height level, execute step S4;

[0085] If there is no intermediate target level between the current vehicle height level and the target height level, the air springs of the front axle and the rear axle are adjusted to the target height level;

[0086] Step S8 specifically includes the following steps:

[0087] If there is an intermediate target level between the current vehicle height level and the target height level, execute step S4;

[0088] If there is no intermediate target level between the current vehicle body height level and the target height level, the air springs of the front axle and the rear axle are adjusted to the target height level after the change.

[0089] Each height level interval in the embodiment of the present application is provided with multiple intermediate target levels, that is, when each intermediate target level adjustment is completed, the suspension controller can determine whether the target height level has changed, and by reasonably setting the height difference corresponding to adjacent intermediate target levels, it is possible to respond to the height level adjustment at any time, including switching to descent during ascent and switching to ascent during descent. As the target level switches, the direction is changed immediately, and there is no need to wait until the current adjustment target is completed before switching the adjustment.

[0090] Exemplarily, there are five intermediate target levels Ha, Hb, Hc, Hd, He between h1 and h2, five intermediate target levels Ha, Hb, Hc, Hd, He between h1 and h2, five intermediate target levels Hf, Hg, Hh, Hi, Hj between h2 and h3, and the heights corresponding to the multiple intermediate target levels between h1 and h2 and between h2 and h3 are equidistantly increased;

[0091] Assuming that the current height is h1, and the height level selected by the driver corresponds to the height h2, if the driver does not reselect the height level during the process of adjusting the suspension height from h1 to h2, the corresponding adjustment process is h1->Ha, Ha->Hb, Hb->Hc, Hc->Hd, Hd->He, He->h2;

[0092] If the driver reselects the height level during the process of adjusting the suspension height from h1 to h2, that is, the target height changes, in one embodiment, when the current height is Hb, the suspension controller determines that the driver has reselected the height level, and the target height corresponds to h1, and the corresponding adjustment process is Hb->Ha, Ha->h1.

[0093] Assuming that the current height is h2, and the height level selected by the driver corresponds to the height h1, if the driver does not reselect the height level during the process of adjusting the suspension height from h2 to h1, the corresponding adjustment process is h2->He, He->Hd, Hd->Hc, Hc->Hb, Hb->Ha, ha->H1;

[0094] If the driver reselects the height level during the process of adjusting the suspension height from h1 to h2, that is, the target height changes, in one embodiment, when the current height is He, the suspension controller determines that the driver has reselected the height level, and the corresponding target height is h3. If the driver does not reselect the height level afterwards, the corresponding adjustment process is He->Hf, Hf->Hg, Hg->Hh, Hh->H i, Hi->Hj, Hj->h3. If when the current height is Hg, the driver reselects the height level again and the target height corresponds to h2, the corresponding adjustment process is Hg->Hf, Hf->h2.

[0095] In some alternative embodiments: See Figures 1 to 2 As shown, the embodiment of the present application provides a method for adjusting the height level of an air suspension, and step S4 of the method for adjusting the height level of an air suspension further includes:

[0096] Compare the height corresponding to the target height level with the height corresponding to the current vehicle body height level to determine the suspension adjustment direction;

[0097] When the height corresponding to the target height level is greater than the height corresponding to the current vehicle body height level, the suspension adjustment direction is rising; when the height corresponding to the target height level is less than the height corresponding to the current vehicle body height level, the suspension adjustment direction is falling.

[0098] The suspension adjustment direction of the embodiment of the present application is divided into two types: rising and falling. That is, the suspension controller compares the height corresponding to the target height level with the height corresponding to the current vehicle body height level, and then can know the direction in which the suspension needs to be adjusted, which facilitates the suspension controller to judge and enter the corresponding height adjustment Case.

[0099] In some alternative embodiments: See Figures 1 to 2 As shown, the embodiment of the present application provides a method for adjusting the height level of an air suspension, and step S5 of the method for adjusting the height level of an air suspension specifically includes:

[0100] The front axle air spring height and the rear axle air spring height are adjusted respectively, and the adjusted heights are the difference between the height corresponding to the intermediate target level and the current front axle air spring height, and the difference between the height corresponding to the intermediate target level and the current rear axle air spring height.

[0101] In the embodiment of the present application, the front axle air spring height and the rear axle air spring height are adjusted separately, which can ensure the stability of the air suspension during the adjustment process and improve the comfort of the passengers.

[0102] See also Figure 3 As shown, the second aspect of the embodiment of the present application provides an air suspension height level adjustment system, including:

[0103] a suspension controller for storing a plurality of height levels and intermediate target levels for adjusting vehicle height;

[0104] The suspension controller is used to obtain the target height level and the current vehicle body height level detected by the height sensor and select an intermediate target level between the target height level and the current vehicle body height level;

[0105] an actuator for adjusting the air springs of both the front and rear axles to an intermediate target level;

[0106] The suspension controller is used to determine whether the target height level has changed. If not, the actuator adjusts the air springs of the front and rear axles to the target height level; if changed, the actuator adjusts the air springs of the front and rear axles to the target height level after the change.

[0107] The suspension controller and actuator of the embodiment of the present application cooperate with each other. As the target height level switches, they can immediately perform switching adjustments at the intermediate target level to achieve switching from descending during the ascent and from ascending during the descent. There is no need to wait until the previously determined target height level is completed before performing adjustment switching, thereby accelerating the response speed of the height level adjustment and improving the driving experience of the driver.

[0108] It should be noted that the target height level obtained by the suspension controller can be the height level selected by the driver, or the height level generated by the suspension function triggered according to the road conditions, or the height level corresponding to the selected driving mode; the suspension controller can detect the current vehicle height through the height sensor and obtain the current vehicle height level corresponding to the current vehicle height; the suspension controller adjusts the height of the front and rear axle air springs through the actuator. The actuator is a prior art, including structures such as an air pump and a valve, and the actuator changes the suspension height by changing the height of the air spring.

[0109] In some alternative embodiments: See Figure 3 As shown, an embodiment of the present application provides an air suspension height level adjustment system, in which each height level interval of a suspension controller of the air suspension height level adjustment system is provided with a plurality of intermediate target levels;

[0110] The suspension controller is used to compare the absolute values ​​of the differences between the heights corresponding to the multiple intermediate target levels and the height corresponding to the current vehicle body height level, and select the corresponding intermediate target level according to the minimum value among the absolute values.

[0111] Each height level interval of the suspension controller of the embodiment of the present application is provided with multiple intermediate target levels, that is, when each intermediate target level adjustment is completed, the suspension controller can determine whether the target height level has changed, and by reasonably setting the height difference corresponding to adjacent intermediate target levels, it can respond to the height level adjustment at any time, including switching to descent during ascent and switching to ascent during descent. As the target level switches, the direction is changed immediately, and there is no need to wait until the current adjustment target is completed before switching the adjustment.

[0112] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0113] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0114] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for adjusting the height level of an air suspension, characterized in that: The method comprises the following steps: S1. The vehicle is provided with a plurality of height levels for adjusting the vehicle height; S2. Intermediate target levels are set in each altitude level interval; S3, obtaining the target height level and the current vehicle height level; S4, selecting an intermediate target level between the target height level and the current vehicle height level; S5, adjust the air springs of the front and rear axles to the middle target level; S6, determine whether the target altitude level has changed, if not, execute step S7, if changed, execute step S8; S7. Adjust the air springs of the front and rear axles to the target height levels; S8. Adjust the air springs of the front and rear axles to the target height level after the change.

2. The method for adjusting the height level of an air suspension according to claim 1, characterized in that: Each of the height level intervals is provided with a plurality of intermediate target levels.

3. The method for adjusting the height level of an air suspension according to claim 2, characterized in that: The step S4 specifically comprises the following steps: The absolute values ​​of the differences between the heights corresponding to the multiple intermediate target levels and the height corresponding to the current vehicle body height level are compared, and the corresponding intermediate target level is selected according to the minimum value among the absolute values.

4. The method for adjusting the height level of an air suspension according to claim 3, characterized in that: The step S7 specifically includes the following steps: If there is an intermediate target level between the current vehicle height level and the target height level, execute step S4; If there is no intermediate target level between the current vehicle body height level and the target height level, the air springs of the front axle and the rear axle are adjusted to the target height level.

5. The method for adjusting the height level of an air suspension according to claim 3, characterized in that: The step S8 specifically includes the following steps: If there is an intermediate target level between the current vehicle height level and the target height level, execute step S4; If there is no intermediate target level between the current vehicle body height level and the target height level, the air springs of the front axle and the rear axle are adjusted to the target height level after the change.

6. The method for adjusting the height level of an air suspension according to claim 1, characterized in that: The step S4 further comprises: Compare the height corresponding to the target height level with the height corresponding to the current vehicle body height level to determine the suspension adjustment direction; When the height corresponding to the target height level is greater than the height corresponding to the current vehicle body height level, the suspension adjustment direction is rising; when the height corresponding to the target height level is less than the height corresponding to the current vehicle body height level, the suspension adjustment direction is falling.

7. The method for adjusting the height level of an air suspension according to claim 1, characterized in that: The step S5 specifically includes: The front axle air spring height and the rear axle air spring height are adjusted respectively, and the adjusted heights are the difference between the height corresponding to the intermediate target level and the current front axle air spring height, and the difference between the height corresponding to the intermediate target level and the current rear axle air spring height.

8. An air suspension height level adjustment system, characterized in that: include: a suspension controller for storing a plurality of height levels and intermediate target levels for adjusting vehicle height; The suspension controller is used to obtain a target height level and a current vehicle body height level detected by a height sensor and select an intermediate target level between the target height level and the current vehicle body height level; an actuator for adjusting the air springs of both the front and rear axles to an intermediate target level; The suspension controller is used to determine whether the target height level has changed. If not, the actuator adjusts the air springs of the front axle and the rear axle to the target height level; if changed, the actuator adjusts the air springs of the front axle and the rear axle to the target height level after the change.

9. The air suspension height level adjustment system according to claim 8, characterized in that: Each of the height level intervals of the suspension controller is provided with a plurality of the intermediate target levels.

10. The air suspension height level adjustment system according to claim 9, characterized in that: The suspension controller is used to compare the absolute values ​​of the differences between the heights corresponding to the multiple intermediate target levels and the height corresponding to the current vehicle body height level, and select the corresponding intermediate target level according to the minimum value among the absolute values.

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