Axle load analysis method, system and equipment for multi-axle automobile equipped with air suspension and medium

Abstract

The invention provides an axle load analysis method, system and equipment for a multi-axle automobile equipped with an air suspension and a medium, and belongs to the technical field of air suspensions, the sprung mass of the multi-axle automobile, the center-of-gravity position in the automobile length direction, the number of supporting points of the multi-axle automobile and the distance between the supporting points of the multi-axle automobile are obtained; acquiring the rigidity of a multi-axle automobile plate spring, the no-load and full-load radiuses of a multi-axle automobile tire, the linear rigidity of the multi-axle automobile tire, the full-load axle load of an air suspension, the no-load and full-load height of the air suspension, the linear rigidity of an air suspension system of the multi-axle automobile and the system rigidity of each fulcrum; and counter-force information of each fulcrum is calculated, the unsprung mass of each fulcrum position is obtained, and the shaft load of each shaft is calculated. By accurately calculating the axle load, the rigidity, the height and the like of the air suspension can be adjusted, so that the air suspension can be automatically adjusted according to the actual axle load condition in the running process of a vehicle, and the running smoothness and the control stability of the vehicle can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air suspension, and in particular relates to an axle load analysis method, system, equipment and medium for a multi-axle vehicle equipped with air suspension. Background Art

[0002] A multi-axle vehicle is a truck with a large number of axles, usually an ordinary truck with the front and cargo box fixed on the same chassis. The multi-axle design is mainly used in special-purpose vehicles such as trucks, military vehicles and large buses.

[0003] In the calculation of axle loads of multi-axle vehicles, for multi-axle vehicles equipped with only leaf spring suspension, the displacement method can be used to obtain relatively accurate axle load calculation results based on the stiffness of leaf springs and tires. However, for multi-axle vehicles equipped with air suspension, especially multi-axle vehicles equipped with both leaf spring suspension and air suspension, it is impossible to obtain accurate stiffness due to the highly nonlinear characteristics of the airbag.

[0004] For multi-axle vehicles equipped with air suspension, the main method for calculating the axle load is the simply supported beam method, that is, the front suspension is regarded as a fulcrum and the rear suspension is regarded as a fulcrum. The support reaction forces of the two fulcrums are calculated through the balance relationship between force and moment, and then the support reaction forces of each fulcrum are evenly distributed to each axle of the front and rear suspensions.

[0005] The current problems with the simply supported beam method are: as the number of vehicle axles increases, the number of fulcrums will increase, resulting in larger errors, and it is impossible to accurately consider the impact of the vehicle wheelbase on the axle load; the simply supported beam method does not take suspension stiffness into account, and is unable to accurately consider the impact of suspension stiffness on axle load. Summary of the invention

[0006] The present invention provides an axle load analysis method for a multi-axle vehicle equipped with an air suspension, which at least solves the problem that accurate stiffness cannot be obtained for a multi-axle vehicle equipped with both a leaf spring suspension and an air suspension due to the highly nonlinear characteristics of the airbag.

[0007] Methods include: Obtain the sprung mass of a multi-axle vehicle, the center of gravity position in the vehicle length direction, the number of fulcrums of the multi-axle vehicle, and the distance between the fulcrums of the multi-axle vehicle; Obtain the stiffness of the leaf spring of a multi-axle vehicle, the unloaded and fully loaded radius of the tire of a multi-axle vehicle, the linearized stiffness of the tire of a multi-axle vehicle, the fully loaded axle load of the air suspension, the unloaded and fully loaded height of the air suspension, the linear stiffness of the air suspension system of a multi-axle vehicle, and the system stiffness of each fulcrum; Calculate the reaction force information of each support point, obtain the unsprung mass at each support point, and calculate the axle load of each axle.

[0008] It should be further explained that, in the method, the vehicle mass is also obtained based on the following method: , where M is the sprung mass of the vehicle, m i The quality of each assembly and component on the automobile spring; Center of gravity position of the vehicle in the length direction , where X is the center of gravity of the vehicle relative to the first bridge in the vehicle length direction, x i It is the center of gravity of each automobile assembly and component relative to a bridge.

[0009] It should be further explained that the methods for obtaining the linearized stiffness of multi-axle vehicle tires include: Calculate the first i Linearized stiffness of the tire with a pivot point t i ; , where R i is the unloaded radius of the tire, r i is the fully loaded radius of the tire, G 轮胎 The load on the tire.

[0010] It should be further explained that the linearized stiffness of the multi-axle vehicle tire is obtained based on the following method: s i : ; In the formula, s i For the i Linearized stiffness of the air suspension with three pivot points.

[0011] It should be further explained that the system stiffness of each support point is calculated according to the following formula: K i : ; For a balanced leaf spring suspension, the system stiffness of the pivot point is calculated using the following formula: ; n The number of tires on each axle.

[0012] It should be further explained that the method of calculating the reaction force information of each support point is to obtain the following formula based on the equilibrium relationship and geometric relationship between force and moment:

[0013] It should be further explained that the calculation of the axle load of each axle p i Calculate according to the following formula: ; For a balanced leaf spring suspension, the axle load is calculated as follows: .

[0014] The present application also provides an axle load analysis system for a multi-axle vehicle equipped with an air suspension, the system comprising: A multi-axle vehicle information acquisition module is used to obtain the sprung mass of the multi-axle vehicle, the center of gravity position in the vehicle length direction, the number of fulcrums of the multi-axle vehicle, and the distance between the fulcrums of the multi-axle vehicle; The stiffness and axle load acquisition module is used to obtain the stiffness of the leaf spring of a multi-axle vehicle, the unloaded and fully loaded radius of the tire of a multi-axle vehicle, the linear stiffness of the tire of a multi-axle vehicle, the fully loaded axle load of the air suspension, the unloaded and fully loaded height of the air suspension, the linear stiffness of the air suspension system of a multi-axle vehicle, and the system stiffness of each fulcrum; The axle load calculation module is used to calculate the reaction force information of each support point, obtain the unsprung mass at each support point, and calculate the axle load of each axle.

[0015] According to another embodiment of the present application, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for analyzing axle loads of a multi-axle vehicle equipped with air suspension when executing the program.

[0016] According to another embodiment of the present application, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for analyzing the axle load of a multi-axle vehicle equipped with an air suspension are implemented.

[0017] It can be seen from the above technical solutions that the present invention has the following advantages: The multi-axle vehicle axle load analysis method provided by the present invention takes into account various parameters of the sprung mass, center of gravity position, suspension, airbag and tire of the multi-axle vehicle, and can more accurately calculate the axle load of each axle, thereby ensuring the performance and safety of the vehicle under different load conditions.

[0018] For the calculation of system stiffness of each support point, the single-axis leaf spring suspension, balanced leaf spring suspension and air suspension are distinguished, and the corresponding calculation formula is given, which can accurately reflect the actual stiffness of each support point under different suspension structures.

[0019] The present application considers that the reaction force information of multiple pivots can be used according to the overall balance condition of the vehicle using the static equilibrium equation. The unsprung mass at each pivot position is obtained in combination with the calculated reaction force information of each pivot. The axle load of each axle can be calculated based on the axle load being equal to the sum of the reaction force of the pivot corresponding to the axle and the gravity generated by the unsprung mass at the pivot position. The method of this embodiment comprehensively considers the various parameters of the sprung mass, center of gravity position, suspension and tires of a multi-axle vehicle. The axle load of each axle can be calculated more accurately. During the vehicle design stage, the axle load calculation can optimize the design of the suspension system, frame structure, etc., to ensure the performance and safety of the vehicle under different load conditions. By accurately calculating the axle load, the present application can adjust the stiffness and height of the air suspension, so that the air suspension can be automatically adjusted according to the actual axle load during driving, which can improve the driving smoothness and handling stability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the calculation model of the axle load analysis method of multi-axle vehicles; Figure 2 It is a schematic diagram of a single-axle leaf spring suspension; Figure 3 It is a schematic diagram of a balanced leaf spring suspension; Figure 4 A flow chart of an axle load analysis method for a multi-axle vehicle equipped with air suspension; Figure 5 A schematic diagram of an axle load analysis system for a multi-axle vehicle equipped with air suspension; Figure 6 Schematic diagram of an electronic device. DETAILED DESCRIPTION

[0022] The method provided in this application aims to solve the defects and shortcomings of the existing axle load calculation methods, and proposes an axle load analysis method for multi-axle vehicles equipped with air suspension.

[0023] The specific steps of the method for analyzing the axle load of a multi-axle vehicle equipped with an air suspension are described in detail below. For the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are provided to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details.

[0024] like Figure 1 An example of the distribution of an axle in a multi-axle vehicle is shown, wherein the first fulcrum 1 has a stiffness K 1 , the second support 2 has a stiffness K 2 , the third support 3 has a stiffness K 3 , the first support point i has a stiffness K i .like Figure 1 The sprung mass M is set.

[0025] To obtain the distance L between the fulcrums of a multi-axle vehicle, we can use Figure 1 After determining the number of fulcrums of a multi-axle vehicle, the distance between each fulcrum can be obtained according to the layout of the vehicle. The distance between fulcrum 1 and fulcrum 2 is L. 12 , the distance between fulcrum 2 and fulcrum 3 is L 23 , the distance between fulcrum a and fulcrum b is L ab .

[0026] like Figure 2 and Figure 3 The schematic diagram of the single-axle leaf spring suspension and the schematic diagram of the balanced leaf spring suspension are given. Figure 2 and Figure 3 The air springs, air suspension control unit, shock absorbers, steering knuckles, wheels and anti-roll bars are involved.

[0027] Air springs can be used to replace traditional steel springs. By adjusting the air pressure to change the spring stiffness, the height of the vehicle body can be adjusted and the vehicle can adapt to uneven roads.

[0028] The air suspension control unit can control various components of the air suspension system, including air springs, shock absorbers, etc. The shock absorbers can absorb and reduce the vibrations generated by the vehicle during driving to keep the vehicle running smoothly.

[0029] In combination with the multi-axle vehicle axle load analysis method involved in this application, the air suspension can adjust the load of each axle in real time according to the driving state and road conditions, optimize the axle load distribution, and improve the stability and handling of the vehicle. By adjusting the pressure of the air spring, more road vibration can be absorbed to provide a smoother driving experience.

[0030] like Figure 2 and Figure 3 The air suspension involved can automatically adjust according to the changes in vehicle load, ensuring that each axle works in the best condition to avoid overload or underload. Through precise axle load distribution, tire wear and engine burden can be reduced, thereby improving fuel economy.

[0031] The air suspension system can also monitor and adjust the vehicle's posture in real time to prevent the vehicle from rolling over or losing control when making sharp turns or braking. It can be seen that the multi-axle vehicle axle load analysis method involved in this application can improve the comfort, stability and safety of multi-axle vehicles by intelligently adjusting the load of each axle.

[0032] In order to clearly describe the technical solution of the present application, the words "first", "second" and the like are used to distinguish the same or similar items with substantially the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit the difference.

[0033] The phrases such as "one embodiment" or "some embodiments" described in the present application mean that the specific features, structures or characteristics described in the embodiment are included in one or more embodiments of the present application. Therefore, the phrases such as "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments" etc. that appear in different places in the present application do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 4 The figure is a flow chart of a method for analyzing axle loads of a multi-axle vehicle equipped with air suspension in a specific embodiment, the method comprising: S101: Obtaining the sprung mass of the multi-axle vehicle, the center of gravity position in the vehicle length direction, the number of fulcrums of the multi-axle vehicle, and the distances between the fulcrums of the multi-axle vehicle.

[0036] In some embodiments, the sprung mass of a multi-axle vehicle can be obtained by obtaining accurate sprung mass data from the vehicle design documents. The mass information of each vehicle component is recorded during the vehicle design phase. Of course, the weighing method can also be used to measure the mass of the entire vehicle, and then the unsprung components such as tires and wheels are removed and weighed again. The difference between the two is the sprung mass.

[0037] Optionally, obtain the sprung mass of a multi-axle vehicle M and the center of gravity in the vehicle length direction X , center of gravity position XRelative to the first bridge of the vehicle. According to the mass of each assembly and component installed on the vehicle and the center of gravity position in the vehicle length direction, the sprung mass of the vehicle and the center of gravity position in the vehicle length direction are obtained. The calculation method is as follows: Vehicle quality: , where M is the sprung mass of the vehicle, m i is the mass of each assembly and component on the automobile spring; the center of gravity position of the vehicle in the length direction: , where X is the center of gravity of the vehicle relative to the first bridge in the vehicle length direction, x i It is the center of gravity of each automobile assembly and component relative to a bridge.

[0038] The center of gravity position in the vehicle length direction can be measured using an axle load meter. Specifically, each axle of the vehicle can be placed on the axle load meter in turn and the axle load of each axle can be recorded. The center of gravity position can be obtained through the principle of mechanical balance combined with geometric parameters such as the vehicle wheelbase.

[0039] In this embodiment, the number of fulcrums of a multi-axle vehicle can be obtained by observing the number of connection points between the vehicle suspension system and the vehicle frame. The accurate number of fulcrums can also be determined by referring to the design drawings of the suspension system.

[0040] Specifically, this embodiment obtains the number of fulcrums N of a multi-axle vehicle. The number of fulcrums of a multi-axle vehicle is the number of supports for the multi-axle vehicle rather than the number of axles. For a single-axle leaf spring suspension, one axle can be regarded as one fulcrum, while a balanced leaf spring suspension, although composed of two axles, is still regarded as one fulcrum. The number of fulcrums of a multi-axle vehicle can be obtained according to the suspension structure and the layout of the entire vehicle.

[0041] For obtaining the distance between the fulcrums of a multi-axle vehicle, a measuring tool can be used for measurement. The precise distance data between the fulcrums can also be obtained by combining the design drawings of the vehicle.

[0042] S102: Obtain the stiffness of the leaf spring of the multi-axle vehicle, the unloaded and fully loaded radii of the tires of the multi-axle vehicle, the linearized stiffness of the tires of the multi-axle vehicle, the fully loaded axle load of the air suspension, the unloaded and fully loaded heights of the air suspension, the linear stiffness of the air suspension system of the multi-axle vehicle, and the system stiffness of each fulcrum.

[0043] In this embodiment, the stiffness of the multi-axis automobile leaf spring is k The acquisition of can be obtained through the parameters on its drawing. i The leaf spring stiffness of the fulcrum is k i .

[0044] Alternatively, an experimental test can be performed by mounting the leaf spring on a special test device, applying a known force, measuring the deformation of the leaf spring, and calculating the leaf spring stiffness according to Hooke's law.

[0045] Get the unloaded radius of multi-axle vehicle tires R and fully loaded radius r The method is based on the tire's unloaded radius and fully loaded radius, which can be obtained from the tire parameter table provided by the tire supplier. i The unloaded radius of a tire is R i , the full load radius is r i .

[0046] The unloaded radius can be measured directly by using a caliper or other tool when the vehicle is not loaded with cargo and the tire is at normal air pressure. The fully loaded radius requires the tire radius to be measured again after the vehicle is loaded to the rated full load mass.

[0047] The linearized stiffness involved in this embodiment t i In general, the linear stiffness of multi-axle vehicle tires t i The tire stiffness is considered to be nonlinear, but since the tire radius when fully loaded does not change much compared to when unloaded, it can be approximately treated as linear stiffness. The linearized stiffness of the tire can be obtained from the parameter table provided by the supplier, or calculated using the following formula: .

[0048] In the formula, t i For the i The linearized stiffness of the tire at each pivot point, R i is the unloaded radius of the tire, r i is the fully loaded radius of the tire, G 轮胎 The load on the tire.

[0049] The method of obtaining the unloaded and fully loaded heights of the air suspension in this embodiment is based on the fact that the unloaded height can be measured by using a laser rangefinder or other tool to measure the distance from the bottom of the air suspension to a fixed reference point on the vehicle frame when the vehicle is not loaded with cargo. The fully loaded height is measured after the vehicle is loaded to the rated fully loaded mass. The vehicle manual sometimes also provides reference values ​​for these two heights.

[0050] In this embodiment, the linear stiffness of the multi-axle automobile air suspension system can be obtained by performing a bench test on the air suspension system. In the test, different forces are applied to the air suspension, the corresponding displacement changes are measured, and then the linear stiffness is calculated according to the definition of stiffness.

[0051] In this embodiment, the system stiffness of each fulcrum comprehensively considers the stiffness information of components such as the air suspension, leaf springs, and tires at the fulcrum.

[0052] S103: Calculate the reaction force information of each support point, obtain the unsprung mass at each support point, and calculate the axle load of each axle.

[0053] In some embodiments, the reaction force information of each fulcrum may be calculated based on the overall balance condition of the vehicle using a static balance equation, and the unsprung mass at each fulcrum position may be obtained in combination with the calculated reaction force information of each fulcrum.

[0054] Specifically, the unsprung mass corresponding to each fulcrum position can be obtained by weighing the vehicle's unsprung tires, wheels, brake discs, etc. During the assembly process, the mass of the unsprung components installed at each fulcrum position is recorded and the unsprung mass of the fulcrum is summarized.

[0055] The method for calculating the axle load of each axle can be based on the fact that the axle load is equal to the sum of the fulcrum reaction force corresponding to the axle and the gravity generated by the unsprung mass at the fulcrum position. The method of this embodiment comprehensively considers the sprung mass, center of gravity position, various parameters of the suspension and tires of a multi-axle vehicle. The axle load of each axle can be calculated more accurately. During the vehicle design stage, the axle load calculation can optimize the design of the suspension system, frame structure, etc., to ensure the performance and safety of the vehicle under different load conditions. By accurately calculating the axle load, the present application can adjust the stiffness and height of the air suspension, etc., so that the air suspension can be automatically adjusted according to the actual axle load during driving, which can improve the driving smoothness and handling stability of the vehicle.

[0056] On the basis of the above embodiments, in order to further improve the reliability and control stability of the axle load analysis method for a multi-axle vehicle equipped with an air suspension provided in the above embodiments. The following method steps are further implementable methods based on the above methods, which are consistent with the above embodiments in obtaining the sprung mass of the multi-axle vehicle, the center of gravity position in the vehicle length direction, the number of fulcrums of the multi-axle vehicle, and the distance between the fulcrums of the multi-axle vehicle. The stiffness of the leaf spring of the multi-axle vehicle, the unloaded and fully loaded radius of the tire of the multi-axle vehicle, and the linear stiffness of the tire of the multi-axle vehicle are obtained.

[0057] In this embodiment, the full-load axle load G of the air suspension is obtained. 空悬 It can be obtained based on the full-load axle load of the air suspension according to the vehicle parameters and layout.

[0058] Get the unloaded height of the air suspension H and full load height h The method is: the unloaded height of the air suspension H and full load height h , obtained according to the vehicle parameters and layout, record thei Air suspension unloaded height with fulcrums H i and full load height h i .

[0059] To obtain the linear stiffness of multi-axle vehicle air suspension s Generally speaking, the air suspension contains airbags, and the stiffness of the airbags is nonlinear, which makes the stiffness of the air suspension nonlinear. However, the nonlinear process is not considered in the calculation, only the beginning and end of the loading are considered, so it can be calculated according to the following formula: In the formula, s i For the i Linearized stiffness of the air suspension with three pivot points.

[0060] Get the system stiffness at each support point K i The system stiffness at each pivot point includes the stiffness of the leaf spring and the tire.

[0061] For a single-axle leaf spring suspension, the system stiffness of the pivot point can be calculated using the following formula: ; For a balanced leaf spring suspension, the system stiffness of the fulcrum can be calculated by the following formula: ; For air suspension, the result calculated in step 9 can be used directly s i .Right now K i = s i .in, K i For the i The system stiffness of the support points, n The number of tires on each axle.

[0062] The method for calculating the reaction force F of each fulcrum in this embodiment is to combine the center of gravity position of the whole vehicle, and obtain the following formula according to the balance relationship and geometric relationship between force and moment: .

[0063] This embodiment also obtains the unsprung mass at each fulcrum position u i The unsprung mass of this embodiment includes the mass of the suspension, axle, tire and rim. i The unsprung mass of the fulcrum is u i .

[0064] Finally, calculate the axle load of each axle p i For single-weight suspension and air suspension, the axle load is calculated according to the formula: Calculation; For balanced leaf spring suspension, the axle load is based on the formula: calculate.

[0065] The above method reduces the complexity of calculation by linearizing nonlinear stiffness and providing a unified calculation framework. It is suitable for multi-axle vehicle axle load analysis with different types of suspension systems. The accurate axle load data provided by this method can provide support for vehicle design and improve the vehicle's handling and comfort.

[0066] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0067] The following is an embodiment of the axle load analysis system for a multi-axle vehicle equipped with air suspension provided by the embodiments of the present disclosure. The system and the axle load analysis methods for a multi-axle vehicle equipped with air suspension of the above-mentioned embodiments belong to the same inventive concept. For details not fully described in the embodiment of the axle load analysis system for a multi-axle vehicle equipped with air suspension, reference can be made to the above-mentioned embodiment of the axle load analysis method for a multi-axle vehicle equipped with air suspension.

[0068] like Figure 5 As shown, the system includes: a multi-axle vehicle information acquisition module, which is used to obtain the sprung mass of the multi-axle vehicle, the center of gravity position in the vehicle length direction, the number of fulcrums of the multi-axle vehicle, and the distance between each fulcrum of the multi-axle vehicle.

[0069] The stiffness and axle load acquisition module is used to obtain the stiffness of multi-axle vehicle leaf springs, the unloaded and fully loaded radii of multi-axle vehicle tires, the linearized stiffness of multi-axle vehicle tires, the fully loaded axle load of the air suspension, the unloaded and fully loaded heights of the air suspension, the linear stiffness of the multi-axle vehicle air suspension system, and the system stiffness of each fulcrum.

[0070] The axle load calculation module is used to calculate the reaction force information of each support point, obtain the unsprung mass at each support point, and calculate the axle load of each axle.

[0071] The axle load analysis system for a multi-axle vehicle equipped with an air suspension involved in the present application can be provided with an interface for user operation and related software, the sprung mass is obtained through data provided by the automobile manufacturer or actual measurement, and the center of gravity position in the vehicle length direction is determined according to the automobile structure using a measuring device or calculation software. The number and distance of the fulcrums are obtained through automobile design drawings or actual measurement.

[0072] The leaf spring rate, tire radius, and linearized stiffness are obtained from laboratory testing or data provided by the manufacturer.

[0073] The full-load axle load, unloaded and full-load heights, and system linear stiffness of the air suspension are obtained through the design and test data of the air suspension system.

[0074] The stiffness of each support system is calculated by combining the stiffness of the air suspension system and the leaf spring. The reaction force of each support is calculated using the mechanical principles and the obtained parameters.

[0075] The unsprung mass at each fulcrum is obtained through actual measurements or data provided by the manufacturer. The axle load of each axle is calculated using mechanical formulas by combining the fulcrum reaction force and the unsprung mass.

[0076] Establish a static equilibrium equation, taking into account factors such as the sprung mass, center of gravity position, number of fulcrums and distance. Use a linearization method to process the stiffness of tires and air suspensions, and express the relationship between the reaction force of each fulcrum and the axle load in the form of a matrix or a set of equations. Output the reaction force of each fulcrum and the axle load through a calculation program.

[0077] The present application can also use multi-body dynamics simulation software to build a virtual prototype of a multi-axle vehicle. Set the parameters of the air suspension system, leaf springs, tires and other components in the simulation environment. Run the simulation to obtain the dynamic changes of the reaction force and axle load of each fulcrum.

[0078] It can be seen that this application can more accurately calculate the axle load of each axle by considering the sprung mass, center of gravity position, number of fulcrums, etc. Combining computer models and simulation models can shorten calculation time and improve work efficiency. It can also predict the changes in axle load of each axle under conditions such as no load, full load, acceleration, braking, etc., providing a basis for automobile design and optimization. It can ensure the stability and safety of the automobile during operation and avoid safety problems caused by overloading or uneven axle load distribution. Optimizing axle load distribution can improve the fuel economy of the automobile and the service life of the tire.

[0079] like Figure 6 As shown, the present application also provides an electronic device, including a display module 103, a memory 102, a processor 101, and a computer program stored in the memory and executable on the processor 101, wherein the processor 101 implements the steps of an axle load analysis method for a multi-axle vehicle equipped with air suspension when executing the program.

[0080] In embodiments of the present invention, electronic devices include, but are not limited to, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments of the present application described and / or required herein.

[0081] In the embodiment of the present application, the processor 101 can be implemented by using at least one of an application-specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microcontroller, a microprocessor, and an electronic unit designed to perform the functions described herein. In some cases, such an implementation can be implemented in a controller. For software implementation, implementations such as processes or functions can be implemented with separate software modules that allow execution of at least one function or operation. The software code can be implemented by a software application (or program) written in any appropriate programming language, and the software code can be stored in a memory and executed by a controller.

[0082] The display module 103 is used to display information input by the user or information provided to the user. The display module 103 may include a display panel, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc.

[0083] The memory 102 may be used to store software programs and various data. The memory 102 may include a high-speed random access memory and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0084] The present application also provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method for analyzing the axle load of a multi-axle vehicle equipped with an air suspension.

[0085] The storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0086] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for analyzing the axle load of a multi-axle vehicle equipped with air suspension, characterized in that the method include: Obtain the sprung mass of a multi-axle vehicle, the center of gravity position in the vehicle length direction, the number of fulcrums of the multi-axle vehicle, and the distance between the fulcrums of the multi-axle vehicle; Obtain the stiffness of the leaf spring of a multi-axle vehicle, the unloaded and fully loaded radius of the tire of a multi-axle vehicle, the linearized stiffness of the tire of a multi-axle vehicle, the fully loaded axle load of the air suspension, the unloaded and fully loaded height of the air suspension, the linear stiffness of the air suspension system of a multi-axle vehicle, and the system stiffness of each fulcrum; Calculate the reaction force information of each support point, obtain the unsprung mass at each support point, and calculate the axle load of each axle.

2. The method for analyzing axle loads of a multi-axle vehicle equipped with air suspension according to claim 1, characterized in that: In the method, the vehicle mass is also obtained based on the following method: , where M is the sprung mass of the vehicle, m i The quality of each assembly and component on the automobile spring; Center of gravity position of the vehicle in the length direction , where X is the center of gravity of the vehicle relative to the first bridge in the vehicle length direction, x i It is the center of gravity of each automobile assembly and component relative to a bridge.

3. The method for analyzing axle loads of a multi-axle vehicle equipped with air suspension according to claim 1, characterized in that: Ways to obtain the linearized stiffness of multi-axle vehicle tires include: Calculate the first i Linearized stiffness of the tire with 4 pivot points t i ; , where R i is the unloaded radius of the tire, r i is the fully loaded radius of the tire, G 轮胎 The load on the tire.

4. The method for analyzing axle loads of a multi-axle vehicle equipped with air suspension according to claim 1, characterized in that: The linearized stiffness of multi-axle vehicle tires is obtained based on the following method: s i : ; In the formula, s i For the i Linearized stiffness of the air suspension with three pivot points.

5. The method for analyzing axle loads of a multi-axle vehicle equipped with air suspension according to claim 1, characterized in that: The system stiffness at each support point is calculated according to the following formula K i : ； For a balanced leaf spring suspension, the system stiffness of the pivot point is calculated using the following formula: ; n The number of tires on each axle.

6. The method for analyzing axle loads of a multi-axle vehicle equipped with air suspension according to claim 1, characterized in that: The method of calculating the reaction force information of each support point is to obtain the following formula based on the equilibrium relationship and geometric relationship between force and moment: 。 7. The method for analyzing axle loads of a multi-axle vehicle equipped with air suspension according to claim 1, characterized in that: Calculate the axle loads p i Calculate according to the following formula: ; For a balanced leaf spring suspension, the axle load is calculated as follows: .

8. A system for analyzing axle loads of a multi-axle vehicle equipped with air suspension, characterized in that: The system is used to implement the axle load analysis method for a multi-axle vehicle equipped with air suspension as described in any one of claims 1 to 7; The system includes: A multi-axle vehicle information acquisition module is used to obtain the sprung mass of the multi-axle vehicle, the center of gravity position in the vehicle length direction, the number of fulcrums of the multi-axle vehicle, and the distance between the fulcrums of the multi-axle vehicle; The stiffness and axle load acquisition module is used to obtain the stiffness of the leaf spring of a multi-axle vehicle, the unloaded and fully loaded radius of the tire of a multi-axle vehicle, the linear stiffness of the tire of a multi-axle vehicle, the fully loaded axle load of the air suspension, the unloaded and fully loaded height of the air suspension, the linear stiffness of the air suspension system of a multi-axle vehicle, and the system stiffness of each fulcrum; The axle load calculation module is used to calculate the reaction force information of each support point, obtain the unsprung mass at each support point, and calculate the axle load of each axle.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the axle load analysis method for a multi-axle vehicle equipped with air suspension as described in any one of claims 1 to 7 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for analyzing axle loads of a multi-axle vehicle equipped with air suspension as claimed in any one of claims 1 to 7 are implemented.

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