Vehicle and vehicle axle lifting control method

Abstract

The present invention relates to a vehicle and a vehicle axle lifting control method. The vehicle includes: a vehicle frame, to which at least three axles are connected; at least two axles are liftable axles; the vehicle further includes: a control device capable of controlling the lifting of any liftable axle. The vehicle axle lifting control method sets at least two of at least three axles on the vehicle frame as liftable axles, and enables any liftable axle to be lifted under the control of the control device. Since at least two axles are liftable axles and any liftable axle can be lifted under the control of the control device, different axles can be in a lifted state during use. Compared with the prior art, it can solve the problem of inconsistent tire wear caused by the lifting of the drive axle in the prior art.

Description

Technical Field

[0001] The present invention relates to a vehicle and a control method for lifting an axle of the vehicle. Background Art

[0002] Axle lifting can achieve the distribution of wheel loads. The wheels on the lifted axle can be separated from the ground, thereby reducing the driving resistance of the vehicle, decreasing the vehicle energy consumption, and being beneficial to the uniform wear of the tires. The existing axle lifting generally relies on lifting airbags to achieve. For example, a rear lifting axle air suspension system for a tractor disclosed in a Chinese patent document with publication number CN104354557A, and a heavy truck lifting air suspension system disclosed in a Chinese patent document with publication number CN105539048A. The lifting airbag and the load-bearing airbag cooperate to achieve the lifting of the corresponding drive axle.

[0003] However, currently, the liftable axles of vehicles are fixed axles. For example, for a drive axle that needs to provide rotational power to the wheels, due to the layout requirements of the drive transmission system of the traditional axle suspension, if the lifting airbag is arranged directly below the main reducer, affected by the occupation of the middle space in the left-right direction of the axle by transmission system components such as the main reducer, differential, and half shafts, the lifting airbag will be almost close to the ground, and the ground clearance cannot meet the vehicle passability requirements. Therefore, in the prior art, a scheme of arranging a single lifting airbag in the middle and on the front and rear sides near the main reducer in the axle is mostly adopted, as well as a scheme of arranging multiple lifting airbags near the wheel hubs. These schemes require the arrangement of an inter-axle differential, an inter-wheel differential, and a clutch for realizing the drive and disconnection of the front and rear axles, etc. The lifting mechanism has many components, complex control, heavy weight, large occupied space volume, and is not easy to implement. In particular, for traditional drive vehicles with double drive axles, such as 6×4 traditional drive vehicles (i.e., vehicles with 6-wheel support and 4-wheel drive, which are 3-axle vehicles, and 2 of the axles are used for driving) and 8×4 traditional drive vehicles (i.e., vehicles with 8-wheel support and 4-wheel drive, which are 4-axle vehicles, and 2 of the axles are used for driving; generally, the rear two axles are used for driving, corresponding to the drive axles, and the front two axles are used for steering, corresponding to the steering axles), since the power needs to be transmitted from the front drive axle of the double drive axles to the rear drive axle, and there is no layout space for the lifting airbag on the front and rear sides of the front drive axle due to the arrangement of the drive shafts, only the rear drive axle of the traditional double drive axles can be lifted.

[0004] However, after the rear axle is lifted, the wear of its tires will be slower than that of other axles, resulting in inconsistent tire wear. In addition, since the load distribution of the axles is often different during each transportation process, and after the rear axle is lifted, the load-bearing distribution of the whole vehicle will also change according to the load distribution situation each time, which may affect the normal driving of the vehicle. Summary of the Invention

[0005] The object of the present invention is to provide a vehicle and a vehicle axle lifting control method, so as to solve the problem of inconsistent tire wear caused by the lifting of the drive axle in the prior art.

[0006] In the present invention, the vehicle adopts the following technical solutions:

[0007] The vehicle includes:

[0008] A vehicle frame, on which at least three axles are connected; at least two axles are liftable axles;

[0009] The vehicle further includes:

[0010] A control device, which can control the lifting of any liftable axle.

[0011] Beneficial effects: By adopting the above technical solutions, since at least two axles are liftable axles, and any liftable axle can be lifted under the control of the control device, different axles can be in a lifted state during use. Compared with the prior art, it can solve the problem of inconsistent tire wear caused by the lifting of the drive axle in the prior art.

[0012] As a preferred technical solution: The vehicle further includes: an axle load detection device, and each liftable axle is provided with a corresponding axle load detection device for detecting its own axle load.

[0013] Beneficial effects: By adopting the above technical solutions, setting the axle load detection device can detect the axle load of each liftable axle, which can provide a basis for selecting whether to lift the axle and which liftable axle to lift, and better ensure the normal driving of the vehicle.

[0014] As a preferred technical solution: The control device is an automatic control device, which is connected to the axle load detection device and can automatically control the lifting of the corresponding liftable axle according to the axle load detected by the axle load detection device.

[0015] Beneficial effects: By adopting the above technical solutions, automatic control can be realized, which is convenient to use.

[0016] As a preferred technical solution: A load-bearing airbag is provided between the axle beam of the liftable axle and the vehicle frame, and the load-bearing airbag forms a support for the vehicle frame; the load-bearing airbag can deflate to match the lifting of the liftable axle.

[0017] Beneficial effects: By adopting the above technical solutions, it is convenient to realize the lifting of the liftable axle, and it can also provide space for the arrangement of the axle lifting mechanism used to realize the axle lifting.

[0018] As a preferred technical solution: A pressure sensor is provided on the load-bearing airbag for detecting the axle load of the corresponding liftable axle according to the airbag pressure;

[0019] The axle load detection device is formed by a pneumatic sensor.

[0020] Advantageous effects: By adopting the above technical solution, axle load detection can be conveniently achieved, and the structure is compact.

[0021] As a preferred technical solution: The axles that can be lifted are all distributed drive axles, and wheel-side drive devices are provided at both ends of the axle crossbeam of the axles that can be lifted in the left-right direction.

[0022] Advantageous effects: By adopting the above technical solution, it is convenient to provide space for the setting of the axle lifting mechanism, and it is possible to more conveniently set two or more axles as axles that can be lifted.

[0023] As a preferred technical solution: The axle crossbeam is in a U-shape, and there is an avoidance recess in the middle in the left-right direction; the opening of the avoidance recess faces downward and is used to provide an installation space for the lifting airbag;

[0024] The top of the avoidance recess is used to connect with the top end of the lifting airbag, and drives the axle crossbeam to rise under the top support of the lifting airbag.

[0025] Advantageous effects: By adopting the above technical solution, the avoidance recess in the middle of the U-shaped axle crossbeam can provide an installation space for the lifting airbag, so that the installation of the lifting airbag can be conveniently achieved, and the structure is simple.

[0026] In the vehicle axle lifting control method of the present invention, the following technical solution is adopted:

[0027] For the vehicle axle lifting control method, at least two of at least three axles on the vehicle frame are set as axles that can be lifted, and any one of the axles that can be lifted can be lifted under the control of the control device.

[0028] Advantageous effects: By adopting the above technical solution, since at least two axles are axles that can be lifted, and any one of the axles that can be lifted can be lifted under the control of the control device, different axles can have the lifted state during use. Compared with the prior art, the problem of inconsistent tire wear caused by the lifting of the drive axle in the prior art can be solved.

[0029] As a preferred technical solution: The total vehicle load is detected, and only when the total vehicle load is less than the set value, the control device will lift the corresponding axle that can be lifted.

[0030] Advantageous effects: By adopting the above technical solution, it is possible to avoid excessive load on the remaining axles after the axle is lifted, which is beneficial to improving safety and ensuring the normal driving of the vehicle.

[0031] As a preferred technical solution: the liftable axle includes two drive axles, and corresponding axle load detection devices are provided on both drive axles to determine the distribution position of the load between the two drive axles; when the control device lifts the corresponding liftable axle, one drive axle away from the load distribution position is lifted.

[0032] Beneficial effects: Adopting the above technical solution can reduce the load change of the non-lifted drive axle, which is more conducive to the uniform wear of the front and rear tires.

[0033] As a preferred technical solution: after the liftable axle is lifted, the rotational speed and torque of the liftable axle drop to 0.

[0034] Beneficial effects: Adopting the above technical solution is beneficial to reducing energy waste and facilitating control.

[0035] As a preferred technical solution: the liftable axle is set as a distributed drive axle, and wheel-side drive devices are provided at both left and right ends of the axle crossbeam of the liftable axle.

[0036] Beneficial effects: Adopting the above technical solution facilitates providing space for the arrangement of the axle lifting mechanism, and can more conveniently set two or more axles as liftable axles.

[0037] As a preferred technical solution: the axle crossbeam is set as a U-shaped, and there is an avoidance recess in the middle in the left-right direction; the avoidance recess opens downward to provide an installation space for the lifting airbag;

[0038] The top of the avoidance recess is connected to the top end of the lifting airbag, and drives the axle crossbeam to rise under the top support of the lifting airbag.

[0039] Beneficial effects: Adopting the above technical solution, the avoidance recess in the middle of the U-shaped axle crossbeam can provide an installation space for the lifting airbag, so that the installation of the lifting airbag can be conveniently realized, and the structure is simple.

[0040] As a preferred technical solution: the liftable axle supports the vehicle frame through a load-bearing airbag, and when the corresponding liftable axle is lifted, the load-bearing airbag is deflated.

[0041] Beneficial effects: Adopting the above technical solution facilitates the lifting of the liftable axle, and can also provide space for the arrangement of the axle lifting mechanism for realizing axle lifting.

[0042] As a preferred technical solution: a pressure sensor is provided on the load-bearing airbag to detect the axle load of the corresponding liftable axle according to the airbag pressure.

[0043] Beneficial effects: Adopting the above technical solution can conveniently realize axle load detection, and the structure is compact. Description of the Drawings

[0044] Figure 1 It is a three-dimensional schematic diagram of two drive axles at the rear in Embodiment 1 of the vehicle in the present invention;

[0045] Figure 2 is Figure 1 the front view of;

[0046] Figure 3 is Figure 2 the top view of;

[0047] Figure 4 It is the axle lifting control logic diagram of the vehicle;

[0048] The names of the components corresponding to the corresponding reference numerals in the figure are: 11, frame; 12, longitudinal beam; 13, cross beam; 14, frame bearing arm; 15, airbag bearing beam; 21, drive axle; 22, front drive axle; 23, rear drive axle; 24, axle cross beam; 25, bearing airbag bracket; 26, wheel side speed reduction mechanism; 27, avoidance recess; 28, lifting airbag top support seat; 31, wheel; 32, wheel side motor; 41, bearing airbag; 42, lifting airbag; 43, guide rod. Detailed implementation manners

[0049] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0050] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings below is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0051] It should be noted that relational terms such as "first" and "second" that may appear in the specific embodiments of the present invention are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "comprising", "including" or any other variant thereof may be intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the statement "including one..." that may appear does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0052] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "coupled" that may appear should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0053] In the description of the present invention, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object of "provided with" may be a part of the body, or it may be arranged separately from the body and connected to the body, and this connection may be a detachable connection or a non-detachable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0054] The following further describes the present invention in detail with reference to embodiments.

[0055] Embodiment 1 of the vehicle in the present invention:

[0056] In this embodiment, the vehicle takes an 8×4 new energy truck as an example. The 8×4 new energy truck includes a frame 11. Four axles are arranged below the frame 11. The two axles at the front of the vehicle are steering axles (not shown in the figure) for realizing the steering of the vehicle; the two axles at the rear of the vehicle are drive axles 21, as Figure 1 and Figure 3 shown, which are a front drive axle 22 and a rear drive axle 23 respectively, for realizing the driving of the vehicle, and both the front drive axle 22 and the rear drive axle 23 are liftable axles. Only the structures of the frame 11, drive axle 21 and wheels 31 and other parts at the rear of the truck are shown in the figure. The structures of the remaining parts of the truck have no direct relation to the improvement of the present invention and will not be described in detail.

[0057] Specifically, as shown in Figure 1 and Figure 3 , the vehicle frame 11 includes two longitudinals 12 extending front and rear. Cross beams 13 are arranged at intervals between the two longitudinals 12. Four L-shaped vehicle frame bearing arms 14 are provided on both the left and right sides of the vehicle frame 11. Each vehicle frame bearing arm 14 has an L-shaped structure, including a horizontally arranged cross arm and a vertically arranged longitudinal arm. The end of the cross arm is fixed to the side of the longitudinal 12, and one end of the longitudinal arm is connected to the cross arm and the other end is arranged downward for connecting to the top of the load-bearing airbag 41. Both the front drive axle 22 and the rear drive axle 23 include four load-bearing airbags 41 arranged symmetrically left and right. Correspondingly, four vehicle frame bearing arms 14 are provided at both the front drive axle 22 and the rear drive axle 23.

[0058] As shown in Figure 1 and Figure 2 , a U-shaped lifting airbag bearing beam is connected between the two cross beams 13 on the front side of the vehicle frame 11, and a U-shaped lifting airbag bearing beam is also connected between the two cross beams 13 on the rear side. The lifting airbag bearing beam is a semi-trailer kingpin beam with a U-shaped cross-section and good structural strength. The lifting airbag bearing beam is located in the middle of the cross beam 13 in the left-right direction, including two vertical parts and one horizontal part. The vertical parts are fixed to the cross beam 13 of the vehicle frame 11, and the horizontal part is connected to the bottom of the vertical parts, intersecting with the axle cross beam 24. An airbag mounting structure is provided thereon to form a lifting airbag bearing seat for supporting the bottom end of the lifting airbag 42. The lifting airbag 42 is used to form an axle lifting mechanism, which is connected to a control valve and can be manually or automatically controlled. After inflation, the corresponding drive axle 21 can be lifted. In order to facilitate judging whether a certain drive axle 21 needs to be lifted, a pressure sensor is provided inside the load-bearing airbag 41, which can calculate the load on each drive shaft and the total vehicle load at the same time.

[0059] Both the front drive axle 22 and the rear drive axle 23 of the vehicle are distributed drive axles 21, that is, drive axles 21 using a wheel-side drive structure. As shown in Figure 1 , each distributed drive axle 21 includes an axle cross beam 24 and a load-bearing airbag bracket 25. Wheel-side speed reduction mechanisms 26 and wheel-side motors 32 are provided at both ends of the axle cross beam 24 to form a wheel-side drive device. The load-bearing airbag bracket 25 is formed by the bent cantilevers at both ends of the axle cross beam 24. The bent cantilevers at both ends each include a front cantilever and a rear cantilever. The front cantilever and the rear cantilever on the same side form a U-shape with the opening facing that side. Each front cantilever and rear cantilever form one said load-bearing airbag bracket 25 for installing the load-bearing airbag 41, and then support the vehicle frame 11 through the load-bearing airbag 41. Specifically, as shown in Figure 2, the axle crossbeam 24 is in a U-shape, including lateral parts arranged at intervals left and right and an intermediate connecting part connected between the tops of the two lateral parts. There is an avoidance recess 27 in the middle in the left-right direction. The intermediate connecting part forms a lifting airbag support seat 28, and the lifting airbag support seat 28 is used to connect to the top end of the lifting airbag 42. Under the support of the lifting airbag 42, the axle crossbeam 24 is driven to rise. The avoidance recess 27 has an opening facing downwards, which is used to provide an installation space for the lifting airbag 42; in order to improve the structural strength, the lateral parts on both sides of the avoidance recess 27 in the left-right direction are arranged obliquely, forming a structure with a narrow top spacing and a wide bottom spacing.

[0060] Of course, in order to achieve stable support between the drive axle 21 and the vehicle frame 11, a guide rod 43 is also provided between the drive axle 21 and the vehicle frame 11. The guide rod 43 is arranged in a V-shape and constitutes a guiding element in the suspension.

[0061] The vehicle also includes a control device. The control device can use the existing control device on the vehicle or can be provided with an independent control device additionally, and can automatically control the lifting of any liftable axle. After the axle does not need to be lifted, the control device controls the axle to descend, that is, to return to the position before lifting.

[0062] During operation, when the front drive axle 22 needs to be lifted, the lifting airbag 42 on the front drive axle 22 is inflated and the front axle load-bearing airbag 41 is deflated to achieve the lifting of the front drive axle 22. At the same time, the wheel-side motor 32 of the front drive axle 22 can be controlled not to output rotational speed and torque. Similarly, when the rear drive axle 23 needs to be lifted, the lifting airbag 42 on the rear drive axle 23 is inflated and the rear axle load-bearing airbag 41 is deflated to achieve the lifting of the rear drive axle 23. At the same time, the wheel-side motor 32 of the rear drive axle 23 can be controlled not to output rotational speed and torque. The control of each liftable axle can be automatic control or manual control.

[0063] Embodiment 2 of the vehicle in the present invention:

[0064] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the middle part of the axle crossbeam 24 has an avoidance recess 27, which is in a U-shape, and the two sides of the avoidance recess 27 in the left-right direction are arranged obliquely; while in this embodiment, the two sides of the avoidance recess 27 in the left-right direction are arranged vertically.

[0065] Embodiment 3 of the vehicle in the present invention:

[0066] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, there are two drive axles 21 at the rear of the new energy vehicle, while in this embodiment, there is only the front drive axle 21 at the rear of the new energy vehicle, and this drive axle 21 also adopts the above-mentioned distributed drive axle 21 structure.

[0067] Embodiment 4 of the vehicle in the present invention:

[0068] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, a U-shaped lifting airbag bearing beam is provided on the vehicle frame 11, while in this embodiment, the lifting airbag bearing beam is of an L-shaped structure, with only one vertical part provided, and the horizontal part is in the form of a cantilever.

[0069] In addition, in the above embodiment, the liftable axle is the drive axle 21. In other embodiments, the liftable axle can also be a non-drive axle 21. In the above embodiment, the vehicle frame 11 is carried by the load-bearing airbag 41. In other embodiments, the vehicle frame 11 can also adopt other forms of suspension, such as a link suspension.

[0070] Embodiment 1 of the axle lift control method for the vehicle in the present invention:

[0071] This method utilizes the vehicle in the above Embodiment 1, such as Figure 4 , calculates the load on the corresponding drive axle 21 through the air pressure sensor inside the load-bearing airbag 41, and selects the following three driving modes to drive the vehicle according to the load distribution between the front drive axle 22 and the rear drive axle 23.

[0072] 1. When the vehicle has a small load and the load distribution is close to the front drive axle 22, the rear drive axle 23 is lifted and its in-wheel motor 32 does not work, with the speed and torque dropping to 0. The front drive axle 22 works, and the load-bearing tonnage meets the design requirements of the rear drive axle 23. At this time, the friction force of the wheels 31 on the front drive axle 22 will increase, providing sufficient driving force.

[0073] A small vehicle load means that the vehicle load is less than a set value, which exists in the vehicle control parameters and can be determined and adjusted according to vehicle type, load capacity, vehicle condition, working conditions, etc.

[0074] 2. When the vehicle has a small load and the load distribution is close to the rear drive axle 23, the front drive axle 22 is lifted and its in-wheel motor 32 does not work, with the speed and torque dropping to 0. The rear drive axle 23 works, and the load-bearing tonnage meets the design requirements of the front drive axle 22. At this time, the friction force of the wheels 31 on the rear drive axle 23 will increase, providing sufficient driving force.

[0075] 3. When the vehicle has a heavy load, neither the front drive axle 22 nor the rear drive axle 23 is lifted, and both drive the vehicle simultaneously.

[0076] In addition, in the above embodiments of the axle lifting control method of the vehicle, the liftable axle is the drive axle 21. In other embodiments, the liftable axle can also be a non-drive axle 21. In the above embodiments of the axle lifting control method of the vehicle, the vehicle frame 11 is carried by the load-bearing airbag 41. In other embodiments, the vehicle frame 11 can also adopt other forms of suspension, such as a link suspension. In the above embodiments of the axle lifting control method of the vehicle, the liftable axle is a distributed drive axle 21, which is convenient for the lifting of each liftable axle. In other embodiments, the liftable axle can also be a traditional axle.

[0077] The solution in the present invention cancels the inter-axle and inter-wheel differentials, clutches and drive shafts of the traditional dual-drive axles, and can manually or automatically control the front and rear drive axles 23 to lift and lower, enabling a 6×4 drive to be converted to 4×2, or an 8×4 drive to be converted to 8×2, thereby reducing the vehicle driving resistance and power consumption. The front drive axle 22 or the rear drive axle 23 can be lifted according to the load, increasing the ground clearance, reducing the turning radius, improving the passing performance, and being beneficial to the uniform wear of the tires and the load adjustment of the vehicle chassis. Moreover, since the axle crossbeam 24 adopts a U-shaped design and the lift airbag bearing beam adopts a semi-circular beam, compared with the traditional lift airbag 42 bearing structure, a cantilever-free design can be achieved, with a simple structure, easy lightweight implementation. For an 8×4 distributed drive vehicle, since the inter-axle and inter-wheel differentials, clutches and drive shafts of the traditional dual-drive axles are cancelled, the front and rear drive axles can be easily lifted. Furthermore, after the drive axle 21 is lifted, if a permanent magnet motor is used for the drive axle 21, no field weakening control is required, which is beneficial to reducing the vehicle energy consumption and improving the safety of the power system.

[0078] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. Any equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention by the same token.

Claims

1. A vehicle, comprising: a vehicle frame, to which at least three axles are connected, characterized in that: at least two axles are liftable axles; the vehicle further comprises: a control device capable of controlling the lifting of any liftable axle. The liftable axles are all distributed drive axles. Each liftable axle includes an axle cross beam, and wheel side drive devices are provided at both left and right ends of the axle cross beam; the vehicle frame includes two longitudinals extending in the front - rear direction. Cross beams are arranged at intervals in the front - rear direction between the two longitudinals. A U - shaped lifting airbag bearing beam is connected between two cross beams. The lifting airbag bearing beam is located in the middle in the left - right direction of the two cross beams and includes two vertical parts and one horizontal part. The vertical parts are respectively fixed on the two cross beams, and the horizontal part is connected to the bottom of the vertical parts; the axle cross beam is in a "U" shape, with an avoidance recess opening downward in the middle in the left - right direction. A lifting airbag is provided between the top of the avoidance recess and the horizontal part of the lifting airbag bearing beam. The axle cross beam is driven to rise by the top support of the lifting airbag to realize the lifting of the liftable axle.

2. The vehicle according to claim 1, wherein, The vehicle further comprises: an axle load detection device. Each liftable axle is provided with a corresponding axle load detection device for detecting its own axle load.

3. The vehicle according to claim 2, characterized in that, The control device is an automatic control device, connected to the axle load detection device, and capable of automatically controlling the lifting of the corresponding liftable axle according to the axle load detected by the axle load detection device.

4. The vehicle according to claim 2 or 3, characterized in that, A load - bearing airbag is provided between the axle cross beam of the liftable axle and the vehicle frame. The load - bearing airbag forms a support for the vehicle frame; the load - bearing airbag can deflate to match the lifting of the liftable axle.

5. The vehicle according to claim 4, characterized in that, A pressure sensor is provided on the load - bearing airbag for detecting the axle load of the corresponding liftable axle according to the airbag pressure; The axle load detection device is formed by a pressure sensor.

6. The vehicle according to claim 1 or 2 or 3, characterized in that, The wheel side drive device is composed of a wheel side reduction mechanism and a wheel side motor.

7. A vehicle axle lifting control method for a vehicle as claimed in claim 1, characterized in that: At least two of at least three axles on the vehicle frame are set as liftable axles. Any liftable axle can be lifted under the control of the control device. The liftable axles are all distributed drive axles. Each liftable axle includes an axle cross beam, and wheel side drive devices are provided at both left and right ends of the axle cross beam.

8. The axle lifting control method for a vehicle according to claim 7, characterized in that, The total vehicle load is detected. Only when the total vehicle load is less than a set value, the control device will lift the corresponding liftable axle.

9. The axle lifting control method for a vehicle according to claim 8, characterized in that, The liftable axle includes two drive axles (21). Corresponding axle load detection devices are provided on both drive axles (21) for determining the distribution position of the load between the two drive axles (21); when the control device lifts the corresponding liftable axle, the drive axle (21) far from the load distribution position is lifted.

10. The axle lift control method for a vehicle according to claim 7 or 8 or 9, characterized in that, After the liftable axle is lifted, the rotational speed and torque of the liftable axle drop to 0.

11. The axle lifting control method for a vehicle according to claim 7 or 8 or 9, characterized in that, The wheel side drive device is composed of a wheel side reduction mechanism and a wheel side motor.

12. The axle lift control method for a vehicle according to claim 7 or 8 or 9, characterized in that, The liftable axle supports the vehicle frame through a load - bearing airbag. When the corresponding liftable axle is lifted, the load - bearing airbag is deflated.

13. The axle lift control method for a vehicle according to claim 12, characterized in that, A pressure sensor is provided on the load - bearing airbag for detecting the axle load of the corresponding liftable axle according to the airbag pressure.

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