Electric heavy truck front wheel camber angle matching method, device and equipment and medium

Abstract

The invention discloses an electric heavy truck front wheel camber angle matching method, device and equipment and a medium, and belongs to the technical field of automobile wheels. The matching method comprises the following steps: arranging a plurality of test points on an I-shaped beam of the electric heavy truck, and obtaining the distance between the test points and the center of the I-shaped beam; applying loads to the plurality of test points, collecting the deformation of each test point, and obtaining deformation data of a plurality of groups of loads and the test points; based on the deformation data of the multiple groups of loads and the test points and the distance between the test points and the center of the I-shaped beam, the relation between the multiple groups of loads and the I-shaped beam deformation is obtained, and then the relation between the loads and the camber angle change of the front wheels of the electric heavy truck is obtained; and setting the front wheel camber angle of the electric heavy truck according to the relationship between the load and the change of the front wheel camber angle of the electric heavy truck and the actual load of the electric heavy truck. The camber angles of the front wheels are set according to the actual load of the electric heavy truck, abnormal abrasion of tires can be relieved, and the stability and safety of vehicle running are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile wheels and relates to a method, a device, equipment and a medium for matching the camber angle of the front wheels of an electric heavy truck. Background Art

[0002] At present, the mainstream electric heavy-duty trucks on the market are still in the technical route stage of oil-to-electricity conversion, that is, the chassis part continues to use the mature fuel vehicle model, the engine is replaced with an electric motor, and a new power battery is added. However, the change in axle load caused by the overall layout of electric heavy-duty trucks is quite different from that of fuel vehicles, especially the situation of the battery back. The current battery power range of electric heavy-duty trucks is 282 degrees to more than 600 degrees, and the battery weight range is 1.8 tons to 3.8 tons, resulting in the front axle load increasing by up to more than 2 tons compared to the original fuel vehicle. Especially for lightweight traction models that pursue full-load operation with zero camber angle, the increased weight has a greater impact on the camber angle of the front wheels, which can easily lead to poor driving stability and abnormal tire wear. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method, device, equipment and medium for matching the camber angle of the front wheels of an electric heavy truck to improve the driving stability of the vehicle.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0005] In a first aspect, the present invention provides a method for matching the camber angle of the front wheels of an electric heavy truck, comprising:

[0006] Set multiple test points on the I-beam of the electric heavy truck and obtain the distance between the test points and the center of the I-beam;

[0007] Applying loads to the plurality of test points, collecting deformation of each test point, and obtaining a plurality of sets of load and test point deformation data;

[0008] Based on the multiple sets of loads and deformation data of the test points, and the distance between the test points and the center of the I-beam, the relationship between the multiple sets of loads and the deformation of the I-beam is obtained;

[0009] Based on the relationship between the multiple groups of loads and the deformation of the I-beam, the relationship between the load and the change of the camber angle of the front wheel of the electric heavy truck is obtained;

[0010] The front wheel camber angle of the electric heavy truck is set according to the relationship between the load and the change of the front wheel camber angle of the electric heavy truck and the actual load of the electric heavy truck.

[0011] Furthermore, loads are applied to the plurality of test points, and the deformation of each test point is collected, including: placing the I-beam of the electric heavy truck on a front axle I-beam test bench, applying loads to the plurality of test points, and collecting the deformation of each test point under the corresponding load.

[0012] Furthermore, based on the multiple sets of load and deformation data of the test points, and the distance between the test points and the center of the I-beam, the relationship between the multiple sets of loads and the deformation of the I-beam is obtained, including: for each load, fitting to obtain the functional relationship between the deformation of a position point on the I-beam and the distance from the position point to the center of the I-beam.

[0013] Furthermore, the function is a quadratic function.

[0014] Further, based on the relationship between the multiple groups of loads and the deformation of the I-beam, the relationship between the load and the change of the camber angle of the front wheel of the electric heavy truck is obtained, including:

[0015] For each load, the bending angles of the plurality of test points are obtained by deriving the quadratic function, and then the change value of the camber angle of the front wheel of the electric heavy truck under the corresponding load is obtained;

[0016] Based on multiple sets of load and front wheel camber angle variation values ​​of electric heavy trucks, the relationship function between load and front wheel camber angle variation of electric heavy trucks is obtained by fitting.

[0017] Furthermore, setting the camber angle of the front wheels of the electric heavy truck includes: setting the camber angle of the front wheels of the electric heavy truck with a gradient of 0.25°.

[0018] In a second aspect, the present invention further provides a front wheel camber angle matching device for an electric heavy truck, the device comprising:

[0019] A test point setting module is used to set multiple test points on the I-beam of an electric heavy truck and obtain the distance between the test points and the center of the I-beam;

[0020] A test point deformation data acquisition module is used to apply loads to the multiple test points, collect the deformation of each test point, and obtain multiple sets of load and test point deformation data;

[0021] A module for acquiring the relationship between loads and I-beam deformation, for acquiring the relationship between multiple sets of loads and I-beam deformation based on the multiple sets of loads and deformation data of the test points, and the distance between the test points and the center of the I-beam;

[0022] A module for acquiring the relationship between load and front wheel camber angle change, for acquiring the relationship between load and front wheel camber angle change of the electric heavy truck based on the relationship between the multiple groups of loads and I-beam deformations;

[0023] The front wheel camber angle setting module is used to set the front wheel camber angle of the electric heavy truck according to the relationship between the load and the change of the front wheel camber angle of the electric heavy truck and the actual load of the electric heavy truck.

[0024] In a third aspect, the present invention further provides a computer device, comprising:

[0025] Memory for storing computer programs;

[0026] The processor is used to execute the computer program to implement the steps of the above-mentioned method for matching the camber angle of the front wheels of the electric heavy truck.

[0027] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the steps of the above-mentioned method for matching the front wheel camber angle of an electric heavy truck.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The electric heavy truck front wheel camber angle matching method provided by the present invention applies a load to the test point on the I-beam, collects the deformation data of the test point, fits the functional relationship between the load and the deformation of the I-beam, and further fits the functional relationship between the load and the change in the front wheel camber angle of the electric heavy truck. Electric heavy trucks with different battery weights can set matching front wheel camber angles according to the functional relationship between the load and the change in the front wheel camber angle of the electric heavy truck, so that the vehicle is less likely to have problems such as deviation or tire eating during driving, thereby improving driving stability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic flow chart of a method for matching the front wheel camber angle of an electric heavy truck provided in an embodiment of the present invention;

[0031] Figure 2 A scatter line graph formed by deformation data of test points under different loads in an embodiment of the present invention;

[0032] Figure 3 It is a scatter line graph formed by the deformation data of the test point under the load of 54.88kN in the embodiment of the present invention;

[0033] Figure 4 A scatter line graph of the front wheel camber angle change values ​​under different loads in an embodiment of the present invention;

[0034] Figure 5 A schematic structural diagram of a front wheel camber angle matching device for an electric heavy truck provided in an embodiment of the present invention;

[0035] Figure 6 An internal structure diagram of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. The embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0037] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] Embodiment 1:

[0039] like Figures 1 to 3 As shown, an embodiment of the present invention provides a method for matching the camber angle of the front wheels of an electric heavy truck. Figure 1 The flowchart is a schematic diagram of the method for matching the camber angle of the front wheels of the electric heavy truck. This flowchart only shows the logical sequence of the method described in this embodiment. In other possible embodiments of the present invention, different methods may be used without conflict. Figure 1 The steps shown or described are accomplished in the order shown.

[0040] The electric heavy truck front wheel camber angle matching method provided in this embodiment can be applied to a terminal, and can be executed by an electric heavy truck front wheel camber angle matching device, which can be implemented by software and / or hardware, and the device can be integrated in a terminal.

[0041] See also Figure 1 The method of the embodiment of the present invention specifically includes the following steps:

[0042] Step 1: Set multiple test points on the I-beam of the electric heavy truck and obtain the distance between the test points and the center of the I-beam.

[0043] The I-beam is a component of the front axle of an electric heavy truck. The front axle mainly includes the I-beam, steering knuckle, kingpin, trapezoidal arm, tie rod, wheel hub, etc. Taking the front axle of a common electric heavy truck on the market as an example, the rated load of the front axle is 5 tons. When matching a fuel vehicle, the front wheel camber angle is set to 0.5° and the front wheel toe is 1±0.5mm.

[0044] In the embodiment of the present invention, 7 test points are selected on the I-beam of the electric heavy truck, and the distances between the 7 test points and the center of the I-beam are: -740mm (test point 1), -440mm (test point 2), -220mm (test point 3), 0mm (test point 4), 220mm (test point 5), 440mm (test point 6) and 740mm (test point 7).

[0045] Step 2: Apply loads to the multiple test points, collect the deformation of each test point, and obtain multiple sets of load and test point deformation data.

[0046] The I-beam of the electric heavy truck is placed on the front axle I-beam test bench, loaded with different loads, and the deformation of each test point is collected under each load. The test data are shown in Table 1.

[0047] Table 1 Deformation data of test points under different loads

[0048]

[0049] Step 3: Based on the multiple sets of loads and deformation data of the test points, and the distance between the test points and the center of the I-beam, the relationship between the multiple sets of loads and the deformation of the I-beam is obtained.

[0050] like Figure 2 As shown, with the distance of each test point from the center of the I-beam as the horizontal coordinate and the deformation of the test point as the vertical coordinate, the deformation data of the test points under 7 loads in this embodiment can form 7 scattered point polylines.

[0051] For each load, the scattered point polyline is fitted into a curve to obtain the functional relationship between the deformation of the position point on the I-beam and the distance from the position point to the center of the I-beam.

[0052] The functional relationship between the deformation of a position point on the I-beam and the distance from the position point to the center of the I-beam is a quadratic function.

[0053] by Figure 3 Taking the scatter line graph corresponding to the load of 54.88 kN as an example, the fitting curve can obtain a quadratic equation with a correlation of 0.9922:

[0054] ,

[0055] in, Indicates the distance from the position point on the I-beam to the center of the I-beam. Indicates the deformation amount of the position point.

[0056] Step 4: Based on the relationship between the multiple groups of loads and the deformation of the I-beam, the relationship between the load and the change in the camber angle of the front wheel of the electric heavy truck is obtained.

[0057] Step 4 specifically includes:

[0058] Step 41: For each load, the bending angles of the plurality of test points are obtained by deriving the quadratic function, and then the change value of the camber angle of the front wheel of the electric heavy truck under the corresponding load is obtained.

[0059] The functional relationship between the deformation of a point on an I-beam under a load of 54.88 kN and the distance from the point to the center of the I-beam is used as an example to explain.

[0060] right Taking the derivative, we get:

[0061] ,

[0062] Substitute the distance between the test point and the center of the I-beam into the derivative equation The slope of the test point in the original quadratic equation can be obtained, and then the bending arc value and bending angle value of the test point can be calculated. The calculation results of multiple test points are shown in Table 2, where 910mm and -910mm are the distances from the center of the kingpin of this axle to the center of the I-beam:

[0063] Table 2 Bending degree data of test points

[0064]

[0065] It can be seen from the calculation data in Table 2 that under a load of 54.88 kN, the change value of the front wheel camber angle of the electric heavy truck in this embodiment is 0.52°.

[0066] Step 42: Based on multiple sets of load and front wheel camber angle variation values ​​of the electric heavy truck, a relationship function between the load and the front wheel camber angle variation of the electric heavy truck is obtained by fitting.

[0067] The same processing is performed on the functional relationship between the deformation of a position point on the I-beam under different loads and the distance from the position point to the center of the I-beam to obtain the relationship between different loads and the change in the front wheel camber angle. Table 3 shows the change values ​​of the front wheel camber angle corresponding to the 7 loads in this embodiment.

[0068] Table 3 Changes in front wheel camber angle under different loads

[0069]

[0070] like Figure 4 As shown, with load as the horizontal axis and the change value of the front wheel camber angle as the vertical axis, the data in Table 3 can be obtained into a scatter line graph.

[0071] Will Figure 4The scattered points shown are fitted into a curve, and a linear equation can be obtained with a correlation of 0.9993:

[0072] ,

[0073] in, represents the load, Indicates the change in front wheel camber angle.

[0074] Step 5: Set the front wheel camber angle of the electric heavy truck according to the relationship between the load and the change of the front wheel camber angle of the electric heavy truck and the actual load of the electric heavy truck.

[0075] Taking a lightweight electric tractor with 423 kWh of electricity as an example, the front axle with a rated load of 5T is selected. The front axle load during actual operation is 7200kg, of which the total weight of the front axle and front wheels is 600kg. The load borne by the I-beam is the front axle load minus the weight of the front axle and front wheels. The load on the I-beam is 64.68kN ((7200-600)*9.8 / 1000).

[0076] Substituting 64.68 kN into , the change in the front wheel camber angle is 0.64°.

[0077] Taking into account various aspects such as engineering cost and uniformity, the wheel camber angle of the present invention is set with a gradient of 0.25°. When selecting different initial parameters of the front wheel camber angle according to different axle load values, a higher one will be selected. In practice, a slight compensation can be made by appropriately adjusting the toe value. Therefore, the final front wheel camber angle set in this embodiment is 0.75°.

[0078] Embodiment 2:

[0079] Based on the same inventive concept as in Example 1, the embodiment of the present invention further provides an electric heavy truck front wheel camber angle matching device for implementing the above electric heavy truck front wheel camber angle matching method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiment of the electric heavy truck front wheel camber angle matching device provided below can refer to the limitations of the electric heavy truck front wheel camber angle matching method above, and will not be repeated here.

[0080] like Figure 5 As shown, an embodiment of the present invention provides a front wheel camber angle matching device for an electric heavy truck, comprising:

[0081] A test point setting module is used to set multiple test points on the I-beam of an electric heavy truck and obtain the distance between the test points and the center of the I-beam;

[0082] A test point deformation data acquisition module is used to apply loads to the multiple test points, collect the deformation of each test point, and obtain multiple sets of load and test point deformation data;

[0083] A module for acquiring the relationship between loads and I-beam deformation, for acquiring the relationship between multiple sets of loads and I-beam deformation based on the multiple sets of loads and deformation data of the test points, and the distance between the test points and the center of the I-beam;

[0084] A module for acquiring the relationship between load and front wheel camber angle change, for acquiring the relationship between load and front wheel camber angle change of the electric heavy truck based on the relationship between the multiple groups of loads and I-beam deformations;

[0085] The front wheel camber angle setting module is used to set the front wheel camber angle of the electric heavy truck according to the relationship between the load and the change of the front wheel camber angle of the electric heavy truck and the actual load of the electric heavy truck.

[0086] Embodiment 3:

[0087] The embodiment of the present invention further provides a computer device, which may be a server, and its internal structure diagram may be as shown in FIG. Figure 6 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the camber angle matching method of the front wheel of the electric heavy truck in the aforementioned embodiment is implemented.

[0088] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0089] Embodiment 4:

[0090] The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the following method are implemented:

[0091] Set multiple test points on the I-beam of the electric heavy truck and obtain the distance between the test points and the center of the I-beam;

[0092] Applying loads to the plurality of test points, collecting deformation of each test point, and obtaining a plurality of sets of load and test point deformation data;

[0093] Based on the multiple sets of loads and deformation data of the test points, and the distance between the test points and the center of the I-beam, the relationship between the multiple sets of loads and the deformation of the I-beam is obtained;

[0094] Based on the relationship between the multiple groups of loads and the deformation of the I-beam, the relationship between the load and the change of the camber angle of the front wheel of the electric heavy truck is obtained;

[0095] The front wheel camber angle of the electric heavy truck is set according to the relationship between the load and the change of the front wheel camber angle of the electric heavy truck and the actual load of the electric heavy truck.

[0096] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products, and therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0097] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0098] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0100] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A method for matching the camber angle of the front wheels of an electric heavy truck, characterized in that: include: Set multiple test points on the I-beam of the electric heavy truck and obtain the distance between the test points and the center of the I-beam; Applying loads to the plurality of test points, collecting deformation of each test point, and obtaining a plurality of sets of load and test point deformation data; Based on the multiple sets of load and deformation data of the test points, and the distance between the test points and the center of the I-beam, the relationship between the multiple sets of load and the deformation of the I-beam is obtained; Based on the relationship between the multiple groups of loads and the deformation of the I-beam, the relationship between the load and the change of the camber angle of the front wheel of the electric heavy truck is obtained; The front wheel camber angle of the electric heavy truck is set according to the relationship between the load and the change of the front wheel camber angle of the electric heavy truck and the actual load of the electric heavy truck.

2. The method for matching the front wheel camber angle of an electric heavy truck according to claim 1, characterized in that: Applying loads to the multiple test points and collecting the deformation of each test point includes: placing the I-beam of the electric heavy truck on a front axle I-beam test bench, applying loads to the multiple test points, and collecting the deformation of each test point under the corresponding load.

3. The method for matching the front wheel camber angle of an electric heavy truck according to claim 1, characterized in that: Based on the multiple sets of load and deformation data of the test points, and the distance between the test points and the center of the I-beam, the relationship between the multiple sets of loads and the deformation of the I-beam is obtained, including: for each load, fitting to obtain the functional relationship between the deformation of a position point on the I-beam and the distance from the position point to the center of the I-beam.

4. The method for matching the front wheel camber angle of an electric heavy truck according to claim 3, characterized in that: The function is a quadratic function.

5. The method for matching the front wheel camber angle of an electric heavy truck according to claim 4, characterized in that: Based on the relationship between the multiple groups of loads and the deformation of the I-beam, the relationship between the load and the change of the camber angle of the front wheel of the electric heavy truck is obtained, including: For each load, the bending angles of the plurality of test points are obtained by deriving the quadratic function, and then the change value of the camber angle of the front wheel of the electric heavy truck under the corresponding load is obtained; Based on multiple sets of load and front wheel camber angle variation values ​​of electric heavy trucks, the relationship function between load and front wheel camber angle variation of electric heavy trucks is obtained by fitting.

6. The method for matching the front wheel camber angle of an electric heavy truck according to claim 1, characterized in that: The front wheel camber angle of the electric heavy truck is set, including: setting the front wheel camber angle of the electric heavy truck with a gradient of 0.25°.

7. A front wheel camber angle matching device for an electric heavy truck, characterized in that: include: A test point setting module is used to set multiple test points on the I-beam of an electric heavy truck and obtain the distance between the test points and the center of the I-beam; A test point deformation data acquisition module is used to apply loads to the multiple test points, collect the deformation of each test point, and obtain multiple sets of load and test point deformation data; A module for acquiring the relationship between load and I-beam deformation, for acquiring the relationship between multiple sets of loads and I-beam deformation based on the multiple sets of load and test point deformation data and the distance between the test point and the center of the I-beam; A module for acquiring the relationship between load and front wheel camber angle change, for acquiring the relationship between load and front wheel camber angle change of the electric heavy truck based on the relationship between the multiple groups of loads and I-beam deformations; The front wheel camber angle setting module is used to set the front wheel camber angle of the electric heavy truck according to the relationship between the load and the change of the front wheel camber angle of the electric heavy truck and the actual load of the electric heavy truck.

8. A computer device, characterized in that: include: Memory for storing computer programs; A processor is used to execute the computer program to implement the steps of the method for matching the front wheel camber angle of an electric heavy truck according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method for matching the front wheel camber angle of an electric heavy truck according to any one of claims 1 to 6 are implemented.

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