Evaluation method and device for tire bump cover rigidity

Abstract

This application discloses a method and apparatus for evaluating the rigidity of tire bump coverage. The method includes: acquiring a first graph of a target tire, the first graph including: a first relationship curve of the first radial force and first radial displacement of the axle when the target tire moves to a road surface with target bumps but does not completely cover the target bumps, and a second relationship curve of the second radial force and second radial displacement of the axle when moving to a flat road surface; determining the coverage force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve; determining a first coverage stiffness and a first radial stiffness based on the coverage force curve equation and the radial force curve equation, respectively; determining a second graph and a third graph based on the first coverage stiffness and the first radial stiffness, respectively; and evaluating the bump coverage rigidity of the target tire based on the second graph and the third graph. This application solves the technical problem of the difficulty in accurately and comprehensively evaluating the rigidity of tire bump coverage in related technologies.

Description

Technical Field

[0001] This application relates to the field of tire performance testing technology, and more specifically, to a method and apparatus for evaluating the rigidity of tire bump covering. Background Technology

[0002] As users' living standards continue to improve, their demands for comfort and other aspects of the driving experience when using cars and other means of transportation are also constantly increasing. In evaluating vehicle comfort, tire bump cover rigidity is one of the main evaluation methods. Tire bump cover rigidity reflects the tire's ability to cover bumps under static conditions; the better the coverage, the higher the tire's comfort.

[0003] Currently, the evaluation method for tire bump coverage stiffness typically involves radially moving the tire onto a road surface with bumps, outputting the relationship curve between radial force and radial displacement at the tire axle, and then linearly fitting the first and last values ​​of the curve to obtain the tire bump coverage stiffness. However, the tire bump coverage characteristics obtained by the above method are inaccurate and somewhat one-sided, and a more accurate, effective, and comprehensive method for characterizing tire bump coverage stiffness has not yet been proposed.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This application provides a method and apparatus for evaluating the rigidity of tire bump coverings, thereby at least solving the technical problem that related technologies struggle to accurately and comprehensively evaluate the rigidity of tire bump coverings.

[0006] According to one aspect of the embodiments of this application, a method for evaluating the lug coverage stiffness of a tire is provided, comprising: obtaining a first chart of a target tire, wherein the first chart includes: a first relationship curve reflecting the relationship between a first radial force and a first radial displacement of the wheel axle of the target tire when the target tire moves to a road surface with target lugs and the target tire does not completely cover the target lugs; and a second relationship curve reflecting the relationship between a second radial force and a second radial displacement of the wheel axle of the target tire when the target tire moves to a flat road surface; determining the lug coverage force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve, respectively, and determining a first lug coverage stiffness based on the lug coverage force curve equation and a first radial stiffness based on the radial force curve equation; determining a second chart and a third chart of the target tire based on the first lug coverage stiffness and the first radial stiffness, wherein the second chart reflects the lug coverage capability of the target tire and the third chart reflects the radial displacement of the wheel axle of the target tire; and evaluating the lug coverage stiffness of the target tire based on the second chart and the third chart.

[0007] Optionally, obtaining the first chart of the target tire includes: obtaining the first radial force and first radial displacement of the target tire's axle when the target tire moves to a road surface with a target bump and the target tire does not completely cover the target bump, and determining a first relationship curve based on the first radial force and first radial displacement; obtaining the second radial force and second radial displacement of the target tire's axle when the target tire moves to a flat road surface, and determining a second relationship curve based on the second radial force and second radial displacement; plotting the first relationship curve and the second relationship curve in the same chart with radial displacement as the horizontal axis and radial force as the vertical axis to obtain the first chart.

[0008] Optionally, after obtaining the first chart of the target tire, the method further includes: obtaining the first covering force and the first covering displacement of the target tire when the target tire completely covers the target bump; obtaining the equal covering force points in the second relationship curve that are equal to the first covering force, and obtaining the equal covering displacement points that are equal to the first covering displacement; determining the displacement difference based on the equal covering force points and the first covering displacement, and determining the radial force difference based on the first covering force and the equal covering displacement points, wherein the displacement difference is used to represent the height of the target bump, and the radial force difference is used to represent the bump covering capacity of the target tire.

[0009] Optionally, the equations of the covering force curve corresponding to the first relationship curve and the equations of the radial force curve corresponding to the second relationship curve are determined respectively, and the first covering stiffness is determined based on the equations of the covering force curve and the first radial stiffness is determined based on the equations of the radial force curve, including: obtaining the equation of the covering force curve corresponding to the first relationship curve by using a polynomial fitting method, and obtaining the first covering stiffness by differentiating the equation of the covering force curve; obtaining the equation of the radial force curve corresponding to the second relationship curve by using a polynomial fitting method, and obtaining the first radial stiffness by differentiating the equation of the radial force curve.

[0010] Optionally, determining a second chart and a third chart of the target tire based on the first sheathing stiffness and the first radial stiffness respectively includes: determining a second chart of the target tire with radial force as the horizontal axis and sheathing stiffness as the vertical axis, and based on the first sheathing stiffness and the first radial stiffness; and determining a third chart of the target tire with radial displacement as the horizontal axis and sheathing stiffness as the vertical axis, and based on the first sheathing stiffness and the first radial stiffness.

[0011] Optionally, the bump-covering stiffness of the target tire is evaluated based on the second and third charts, including: obtaining the second covering stiffness and the second radial stiffness corresponding to the equal covering force points through the second chart, and determining a first stiffness difference based on the second covering stiffness and the second radial stiffness, wherein the first stiffness difference is used to reflect the stiffness difference between the first covering stiffness and the second covering stiffness corresponding to the first covering displacement when the target tire fully covers the target bump; obtaining the third covering stiffness and the third radial stiffness corresponding to the equal covering displacement points through the third chart, and determining a second stiffness difference based on the third covering stiffness and the third radial stiffness, wherein the second stiffness difference reflects the stiffness difference between the first covering stiffness and the third covering stiffness corresponding to the first covering displacement when the target tire fully covers the target bump.

[0012] Optionally, the target bump is upwardly protruding, and the cross-sectional shape of the target bump includes at least one of the following: square, semi-circular, elliptical, and triangular.

[0013] According to another aspect of the embodiments of this application, an evaluation device for tire bump coverage stiffness is also provided, comprising: an acquisition module, configured to acquire a first chart of a target tire, wherein the first chart includes: a first relationship curve reflecting the first radial force and first radial displacement of the target tire's axle when the target tire moves to a road surface with target bumps and the target tire does not fully cover the target bumps; and a second relationship curve reflecting the second radial force and second radial displacement of the target tire's axle when the target tire moves to a flat road surface; a first determination module, configured to determine the coverage force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve, respectively, and determine a first coverage stiffness based on the coverage force curve equation, and determine a first radial stiffness based on the radial force curve equation; a second determination module, configured to determine a second chart and a third chart of the target tire based on the first coverage stiffness and the first radial stiffness, wherein the second chart reflects the bump coverage capability of the target tire, and the third chart reflects the radial displacement of the target tire's axle; and an evaluation module, configured to evaluate the bump coverage stiffness of the target tire based on the second chart and the third chart.

[0014] According to another aspect of the embodiments of this application, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored program, wherein the device where the non-volatile storage medium is located executes the above-described method for evaluating the rigidity of tire bump covering by running the program.

[0015] According to another aspect of the embodiments of this application, an electronic device is also provided, the electronic device including: a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the above-described method for evaluating the rigidity of tire bump coverings through the computer program.

[0016] In this embodiment, a first chart of the target tire is obtained, comprising: a first relationship curve reflecting the relationship between the first radial force and the first radial displacement of the target tire's axle when the target tire moves to a road surface with a target bump and the target tire does not fully cover the target bump; and a second relationship curve reflecting the relationship between the second radial force and the second radial displacement of the target tire's axle when the target tire moves to a flat road surface. The covering force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve are determined respectively, and a first covering stiffness and a first radial stiffness are determined based on the covering force curve equation and the radial force curve equation, respectively. A second chart and a third chart of the target tire are determined based on the first covering stiffness and the first radial stiffness, respectively, wherein the second chart reflects the bump covering capacity of the target tire, and the third chart reflects the radial displacement of the target tire's axle. The bump covering stiffness of the target tire is evaluated based on the second chart and the third chart, thereby comprehensively, accurately, and effectively characterizing the tire bump covering stiffness, thus solving the technical problem that related technologies struggle to accurately and comprehensively evaluate the tire bump covering stiffness. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a flowchart of an optional method for evaluating the rigidity of tire bump covering according to an embodiment of this application;

[0019] Figure 2 This is a relational diagram of an optional first chart according to an embodiment of this application;

[0020] Figure 3 This is a comparative schematic diagram of an optional curve fitting degree according to an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of an optional second diagram according to an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of an optional third diagram according to an embodiment of this application;

[0023] Figure 6 This is a schematic diagram comparing an optional second graph according to an embodiment of this application with the relationship between cubic stiffness and radial force obtained by a linear method;

[0024] Figure 7 This is a schematic diagram comparing an optional third graph according to an embodiment of this application with the relationship between cubic stiffness and radial force obtained by a linear method;

[0025] Figure 8 This is a schematic diagram of an optional tire bump covering rigidity evaluation device according to an embodiment of this application. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first," "second," etc., used in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] Example 1

[0029] Currently, the tire bump covering rigidity is mainly obtained by linearly fitting the first and last values ​​of the curve relating the radial force and radial displacement of the tire axle when the tire is covered with bumps. However, since the curve relating the radial force and radial displacement of the tire axle is a non-linear curve in actual representation, the tire bump covering rigidity obtained by this method is inaccurate and rather one-sided.

[0030] To address the aforementioned problems, this application provides a method for evaluating tire sheathing rigidity. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0031] Figure 1 This is a flowchart of an optional method for evaluating the rigidity of tire bump covering according to an embodiment of this application, such as... Figure 1 As shown, the method includes at least steps S102-S108, wherein:

[0032] Step S102: Obtain a first chart of the target tire, wherein the first chart includes: a first relationship curve reflecting the first radial force and the first radial displacement of the target tire axle when the target tire moves to a road surface with a target bump and the target tire does not completely cover the target bump; and a second relationship curve reflecting the second radial force and the second radial displacement of the target tire axle when the target tire moves to a flat road surface.

[0033] In the technical solution provided in step S102 of the present invention, a first relationship curve and a second relationship curve of radial force and radial displacement at the tire axle are obtained respectively under two working conditions: planar ground contact and raised ground contact. Both the first and second relationship curves have radial displacement as the horizontal axis and radial force as the vertical axis. Therefore, the first and second relationship curves are plotted on the same graph to obtain the first graph.

[0034] Optionally, in the embodiments of this application, the target bump is upwardly protruding, and the cross-sectional shape of the target bump includes at least one of the following: square, semi-circle, ellipse, and triangle.

[0035] The optimal maximum cross-sectional length of the target bump is between 5mm and 30mm.

[0036] It should be noted that when acquiring test data (i.e. radial force and radial displacement) of the target tire under both planar and raised ground conditions, at least one complete data collection is required.

[0037] As an optional implementation, in the technical solution provided in step S102 of the present invention, the method may include: obtaining the first radial force and first radial displacement of the wheel axle of the target tire when the target tire moves to the road surface with the target protrusion and the target tire does not completely cover the target protrusion, and determining a first relationship curve based on the first radial force and first radial displacement; obtaining the second radial force and second radial displacement of the wheel axle of the target tire when the target tire moves to the flat road surface, and determining a second relationship curve based on the second radial force and second radial displacement; plotting the first relationship curve and the second relationship curve in the same graph with the radial displacement as the horizontal axis and the radial force as the vertical axis to obtain a first graph.

[0038] In this embodiment, before testing the rigidity of the tire bump covering under both planar grounding and raised grounding conditions, the target tire is first mounted on the corresponding rim, and the tire pressure is adjusted to the specified pressure. Then, when the target tire is moved to the road surface with bumps (raised grounding condition), a vertically downward static charge is applied to the tire to a set load to complete the loading, thereby obtaining a first relationship curve reflecting the first radial force and the first radial displacement of the target tire's axle. At the same time, the target tire is moved to a flat road surface, and a vertically downward static charge is applied to the tire to a set load to complete the loading, thereby obtaining a second relationship curve reflecting the second radial force and the second radial displacement of the axle.

[0039] For example, Figure 2 This is a relational diagram of an optional first chart according to an embodiment of this application, by Figure 2 As can be seen from the graph, the upper curve represents the first relationship between the first radial force and the first radial displacement when the target tire moves on the bumpy road surface; while the upper curve represents the second relationship between the second radial force and the second radial displacement when the target tire moves on the flat road surface. Furthermore, under the same radial force, the radial displacement generated by the target tire's axle on the flat road surface is less than the radial displacement generated on the bumpy road surface; under the same radial displacement, the radial force experienced by the target tire's axle on the flat road surface is greater than the radial force experienced on the bumpy road surface.

[0040] Further, optionally, after obtaining the first chart of the target tire, the first covering force and the first covering displacement of the target tire when the target tire completely covers the target bump can also be obtained; the points of equal covering force in the second relationship curve that are equal to the first covering force and the points of equal covering displacement that are equal to the first covering displacement can be obtained; the displacement difference is determined based on the points of equal covering force and the first covering displacement, and the radial force difference is determined based on the first covering force and the points of equal covering displacement, wherein the displacement difference is used to represent the height of the target bump, and the radial force difference is used to reflect the influence of the target bump on the target tire.

[0041] Specifically, Figure 2Curve segment I represents the relationship between the radial force and radial displacement of the tire axle when the target tire contacts the target bump but not the ground. Curve segment II represents the relationship between the radial force and radial displacement of the tire axle when the target tire completely covers the target bump. Therefore, point A is the inflection point between curve segment I and curve segment II. That is, the abscissa of point A is the first covering displacement when the target tire completely covers the target bump, denoted as DA, and the ordinate of point A is the first covering force when the target tire completely covers the target bump, denoted as FA. Then, the first covering force FA can be applied to the flat road surface. The equal-coverage force point B and equal-coverage displacement point C are obtained from the second relationship curve of radial force and radial displacement of the tire axle. Then, the difference in radial displacement between the inflection point A and the equal-coverage force point B is taken as the displacement difference ΔD, where the displacement difference ΔD is approximately the height of the target bump. At the same time, the difference in radial force between the inflection point A and the equal-coverage displacement point C is recorded as the radial force difference ΔF. The radial force difference ΔF is used to evaluate the feedback of the target tire's influence on the target bump. The smaller the radial force difference ΔF, the stronger the tire's coverage ability, which is reflected in the better tire comfort.

[0042] Step S104: Determine the equations of the covering force curve corresponding to the first relationship curve and the equations of the radial force curve corresponding to the second relationship curve, respectively, and determine the first covering stiffness based on the equations of the covering force curve and the first radial stiffness based on the equations of the radial force curve.

[0043] In the technical solution provided in step S104 of the present invention, the covering force curve equation of the target tire is obtained by performing cubic polynomial fitting on the first relationship curve. Since the covering stiffness is the derivative of the relationship between radial force and radial displacement, the first covering stiffness can be obtained by differentiating the covering force curve equation. Similarly, the radial force curve equation of the target tire is obtained by performing cubic polynomial fitting on the second relationship curve. Since the radial stiffness is the derivative of the relationship between radial force and radial displacement, the first radial stiffness can be obtained by differentiating the radial force curve equation.

[0044] As an optional implementation, in the technical solution provided in step S104 of the present invention, the method may include: obtaining the equation of the covering force curve corresponding to the first relationship curve by using a polynomial fitting method, and obtaining the first covering stiffness by differentiating the equation of the covering force curve; obtaining the equation of the radial force curve corresponding to the second relationship curve by using a polynomial fitting method, and obtaining the first radial stiffness by differentiating the equation of the radial force curve.

[0045] In this embodiment, a polynomial fitting method is used to fit the first relationship curve and the second relationship curve respectively to obtain the covering force curve equation and the radial force curve equation. The first covering stiffness and the first radial stiffness are obtained by differentiating the obtained covering force curve equation and the radial force curve equation respectively.

[0046] Typically, linear methods are used in related technologies to fit relationship curves, but the results obtained by this method deviate significantly from the actual results. For example, Figure 3 This is a comparative schematic diagram of an optional curve fitting degree according to an embodiment of this application, by... Figure 3 It can be seen that, compared with the curve obtained by fitting related technologies using linear methods, the combination obtained by fitting with cubic polynomials in the embodiments of this application is closer to the actual curve, thereby ensuring that the covering stiffness and radial stiffness obtained by subsequently differentiating the curve equation are more accurate.

[0047] It should be noted that in practical applications, the first and second relationship curves can be divided into multiple segments, such as two or three segments, depending on the application scenario. The corresponding covering force curve equation and radial force curve equation can be obtained by using the polynomial fitting method on each segment of the relationship curve.

[0048] Step S106: Determine the second chart and the third chart of the target tire based on the first covering stiffness and the first radial stiffness, respectively. The second chart is used to reflect the bump covering ability of the target tire, and the third chart is used to reflect the radial displacement of the wheel axle of the target tire.

[0049] In the technical solution provided by step S106 of the present invention, the curves of the covering force of the target tire on the bumpy road surface and the flat road surface are generated by the first covering stiffness and the first radial stiffness, respectively, and the obtained covering force curves are plotted in the same chart to obtain the second chart. At the same time, the curves of the radial displacement of the target tire on the bumpy road surface and the flat road surface can also be generated, and the obtained radial displacement curves are plotted in the same chart to obtain the third chart.

[0050] As an optional implementation, in the technical solution provided by step S106 of the present invention, the method may include: determining a second chart of the target tire with radial force as the horizontal axis and covering stiffness as the vertical axis, and based on the first covering stiffness and the first radial stiffness; and determining a third chart of the target tire with radial displacement as the horizontal axis and covering stiffness as the vertical axis, and based on the first covering stiffness and the first radial stiffness.

[0051] In this embodiment, a third curve representing the covering force experienced by the target tire on a bumpy road surface and a fourth curve representing the covering force experienced by the target tire on a flat road surface are generated based on the first covering stiffness and the first radial stiffness, respectively. The third and fourth curves are plotted on the same graph with radial force as the horizontal axis and covering stiffness as the vertical axis, resulting in a second graph. For example, Figure 4 This is a schematic diagram of an optional second diagram according to an embodiment of this application, such as... Figure 4 As shown, the third curve exhibits a parabolic trend of first increasing and then decreasing, while the fourth curve shows a gradually increasing growth trend.

[0052] Similarly, based on the first covering stiffness and the first radial stiffness, a fifth curve representing the radial displacement of the target tire on the bumpy road surface and a sixth curve representing the radial displacement of the target tire on the flat road surface are generated respectively. The fifth and sixth curves are then plotted on the same graph with radial displacement as the horizontal axis and covering stiffness as the vertical axis, resulting in a third graph. For example, Figure 5 This is a schematic diagram of an optional third diagram according to an embodiment of this application, such as... Figure 5 As shown, the fifth curve exhibits a parabolic trend of first increasing and then decreasing, while the sixth curve shows a trend of increasing upward convexity.

[0053] in addition, Figure 6 This is a schematic diagram comparing an optional second graph according to an embodiment of this application with the relationship between cubic stiffness and radial force obtained using a linear method. Figure 6 It can be seen that the difference between the covering force of the target tire on a flat road surface and the covering force of the target tire on a bumpy road surface obtained by the linear method in the embodiments of this application is ΔE. f1 The difference between the target tire's enveloping force on the bumpy surface and the enveloping force obtained using the linear method is ΔE. f2 .and Figure 7 This is a schematic diagram comparing an optional third graph according to an embodiment of this application with the relationship between cubic stiffness and radial force obtained using a linear method. Figure 7 It can be seen that the radial displacement of the target tire on a flat road surface in this embodiment differs from the radial displacement of the target tire on a bumpy road surface obtained by the linear method by ΔE. d1 The radial displacement of the target tire on the bumpy road surface differs from the radial displacement of the target tire on the bumpy road surface obtained by the linear method by ΔE. d2 Therefore, it is further explained that the covering stiffness and radial stiffness obtained by the polynomial fitting method used in the embodiments of this application are not constant as in the linear method.

[0054] Step S108: Evaluate the bump-covering rigidity of the target tire based on the second and third charts.

[0055] As an optional implementation, in the technical solution provided in step S108 of the present invention, the method may include: obtaining the second covering stiffness and the second radial stiffness corresponding to the equal covering force points through a second chart, and determining a first stiffness difference based on the second covering stiffness and the second radial stiffness, wherein the first stiffness difference is used to reflect the stiffness difference between the first covering stiffness and the second covering stiffness corresponding to the first covering displacement when the target tire fully covers the target bump; obtaining the third covering stiffness and the third radial stiffness corresponding to the equal covering displacement points through a third chart, and determining a second stiffness difference based on the third covering stiffness and the third radial stiffness, wherein the second stiffness difference reflects the stiffness difference between the first covering stiffness and the third covering stiffness corresponding to the first covering displacement when the target tire fully covers the target bump.

[0056] Specifically, by Figure 4 Therefore, the cubic covering stiffness at the point of equal covering force B is denoted as Eef, and the cubic radial stiffness at the point of equal covering force B is denoted as Erf. The cubic stiffness difference between the cubic covering stiffness Eef and the cubic radial stiffness Erf can be denoted as ΔEf. From... Figure 5 Therefore, the cubic stiffness at the constant-coverage displacement point C is denoted as Eed, and the cubic radial stiffness at the constant-coverage displacement point C is denoted as Erd. The stiffness difference between the cubic stiffness Eed and the cubic radial stiffness Erd can be denoted as ΔEd. The cubic stiffness difference ΔEf at the constant-coverage force point B and the cubic stiffness difference ΔEd at the constant-coverage displacement point C respectively reflect the changes in the cubic stiffness at the turning point A, compared to the stiffness values ​​at the constant-coverage force point B and the constant-coverage displacement point C, when the target tire instantly and completely covers the target bump.

[0057] In this embodiment, a first chart of the target tire is obtained, comprising: a first relationship curve reflecting the relationship between the first radial force and the first radial displacement of the target tire's axle when the target tire moves to a road surface with a target bump and the target tire does not fully cover the target bump; and a second relationship curve reflecting the relationship between the second radial force and the second radial displacement of the target tire's axle when the target tire moves to a flat road surface. The covering force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve are determined respectively, and a first covering stiffness and a first radial stiffness are determined based on the covering force curve equation and the radial force curve equation, respectively. A second chart and a third chart of the target tire are determined based on the first covering stiffness and the first radial stiffness, respectively, wherein the second chart reflects the bump covering capacity of the target tire, and the third chart reflects the radial displacement of the target tire's axle. The bump covering stiffness of the target tire is evaluated based on the second chart and the third chart, thereby comprehensively, accurately, and effectively characterizing the tire bump covering stiffness, thus solving the technical problem that related technologies struggle to accurately and comprehensively evaluate the tire bump covering stiffness.

[0058] Example 2

[0059] According to an embodiment of this application, a tire cover stiffness evaluation device for implementing the above-described tire cover stiffness evaluation method is also provided. Figure 8 This is a schematic diagram of an optional tire bump covering rigidity evaluation device according to an embodiment of this application, as shown below. Figure 8 As shown, the tire sheathing rigidity evaluation device includes at least: an acquisition module 81, a first determination module 82, a second determination module 83, and an evaluation module 84, wherein:

[0060] The acquisition module 81 is used to acquire a first chart of the target tire, wherein the first chart includes: a first relationship curve reflecting the first radial force and the first radial displacement of the target tire axle when the target tire moves to a road surface with a target bump and the target tire does not completely cover the target bump; and a second relationship curve reflecting the second radial force and the second radial displacement of the target tire axle when the target tire moves to a flat road surface.

[0061] Specifically, module 81 acquires the first and second relationship curves of radial force and radial displacement at the tire axle under two working conditions: planar ground contact and raised ground contact. Both curves have radial displacement as the horizontal axis and radial force as the vertical axis. Therefore, plotting the first and second relationship curves on the same graph yields the first graph.

[0062] Optionally, in the embodiments of this application, the target bump is upwardly protruding, and the cross-sectional shape of the target bump includes at least one of the following: square, semi-circle, ellipse, and triangle.

[0063] The optimal maximum cross-sectional length of the target bump is between 5mm and 30mm.

[0064] It should be noted that when acquiring test data (i.e. radial force and radial displacement) of the target tire under both planar and raised ground conditions, at least one complete data collection is required.

[0065] As an optional implementation, the acquisition module 81 can acquire the first chart of the target tire in the following manner: acquire the first radial force and first radial displacement of the target tire's axle when the target tire moves to a road surface with a target bump and the target tire does not completely cover the target bump, and determine a first relationship curve based on the first radial force and first radial displacement; acquire the second radial force and second radial displacement of the target tire's axle when the target tire moves to a flat road surface, and determine a second relationship curve based on the second radial force and second radial displacement; plot the first relationship curve and the second relationship curve in the same chart with the radial displacement as the horizontal axis and the radial force as the vertical axis to obtain the first chart.

[0066] In this embodiment, before testing the rigidity of the tire bump covering under both planar grounding and raised grounding conditions, the target tire is first mounted on the corresponding rim, and the tire pressure is adjusted to the specified pressure. Then, when the target tire is moved to the road surface with bumps (raised grounding condition), a vertically downward static charge is applied to the tire to a set load to complete the loading, thereby obtaining a first relationship curve reflecting the first radial force and the first radial displacement of the target tire's axle. At the same time, the target tire is moved to a flat road surface, and a vertically downward static charge is applied to the tire to a set load to complete the loading, thereby obtaining a second relationship curve reflecting the second radial force and the second radial displacement of the axle.

[0067] Further, optionally, after obtaining the first chart of the target tire, the first covering force and the first covering displacement of the target tire when the target tire completely covers the target bump can also be obtained; the points of equal covering force in the second relationship curve that are equal to the first covering force and the points of equal covering displacement that are equal to the first covering displacement can be obtained; the displacement difference is determined based on the points of equal covering force and the first covering displacement, and the radial force difference is determined based on the first covering force and the points of equal covering displacement, wherein the displacement difference is used to represent the height of the target bump, and the radial force difference is used to reflect the influence of the target bump on the target tire.

[0068] The first determining module 82 is used to determine the covering force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve, respectively, and to determine the first covering stiffness based on the covering force curve equation and the first radial stiffness based on the radial force curve equation.

[0069] Specifically, the first determining module 82 determines the covering force curve equation of the target tire by performing a cubic polynomial fitting on the first relationship curve. Since the covering stiffness is the derivative of the relationship between radial force and radial displacement, the first covering stiffness can be determined by differentiating the covering force curve equation. Similarly, the radial force curve equation of the target tire is determined by performing a cubic polynomial fitting on the second relationship curve. Since the radial stiffness is the derivative of the relationship between radial force and radial displacement, the first radial stiffness can be determined by differentiating the radial force curve equation.

[0070] As an optional implementation, the first determining module 82 can determine the covering force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve, and determine the first covering stiffness and the first radial stiffness in the following ways: the covering force curve equation corresponding to the first relationship curve is obtained by using a polynomial fitting method, and the first covering stiffness is obtained by differentiating the covering force curve equation; the radial force curve equation corresponding to the second relationship curve is obtained by using a polynomial fitting method, and the first radial stiffness is obtained by differentiating the radial force curve equation.

[0071] In this embodiment, the first determining module 82 uses a polynomial fitting method to fit the first relationship curve and the second relationship curve respectively, thereby obtaining the covering force curve equation and the radial force curve equation. Then, by differentiating the obtained covering force curve equation and radial force curve equation respectively, the first covering stiffness and the first radial stiffness are obtained.

[0072] Typically, related technologies use linear methods to fit the relationship curve, but the results obtained by this method deviate significantly from the actual results. In contrast, the embodiment of this application uses a cubic polynomial fitting method, which yields a result closer to the actual curve, thus ensuring that the subsequent derivatives of the curve equation yield more accurate covering stiffness and radial stiffness.

[0073] It should be noted that in practical applications, the first and second relationship curves can be divided into multiple segments, such as two or three segments, depending on the application scenario. The corresponding covering force curve equation and radial force curve equation can be obtained by using the polynomial fitting method on each segment of the relationship curve.

[0074] The second determining module 83 is used to determine a second chart and a third chart of the target tire based on the first covering stiffness and the first radial stiffness, respectively. The second chart is used to reflect the bump covering ability of the target tire, and the third chart is used to reflect the radial displacement of the wheel axle of the target tire.

[0075] Specifically, the second determining module 83 generates curves of the covering force of the target tire on the bumpy road surface and the flat road surface using the first covering stiffness and the first radial stiffness, respectively, and plots the obtained covering force curves in the same chart to obtain the second chart. At the same time, it can also generate curves of the radial displacement of the target tire on the bumpy road surface and the flat road surface, and plot the obtained radial displacement curves in the same chart to obtain the third chart.

[0076] As an optional implementation, the second determining module 83 can determine the second and third charts of the target tire in the following manner: the second chart of the target tire is determined with radial force as the horizontal axis and the sheathing stiffness as the vertical axis, based on the first sheathing stiffness and the first radial stiffness; the third chart of the target tire is determined with radial displacement as the horizontal axis and the sheathing stiffness as the vertical axis, based on the first sheathing stiffness and the first radial stiffness.

[0077] In this embodiment, the second determining module 83 generates a third curve of the covering force of the target tire on the bumpy road surface and a fourth curve of the covering force of the target tire on the flat road surface based on the first covering stiffness and the first radial stiffness, respectively. The third curve and the fourth curve are plotted on the same graph with radial force as the horizontal axis and covering stiffness as the vertical axis to obtain a second graph.

[0078] Similarly, the second determining module 83 generates a fifth curve of radial displacement of the target tire on the bumpy road surface and a sixth curve of radial displacement of the target tire on the flat road surface based on the first covering stiffness and the first radial stiffness, respectively. The fifth curve and the sixth curve are plotted on the same chart with radial displacement as the horizontal axis and covering stiffness as the vertical axis to obtain a third chart.

[0079] Evaluation module 84 is used to evaluate the bump-covering rigidity of the target tire based on the second and third charts.

[0080] As an optional implementation, the second wrapping stiffness and the second radial stiffness corresponding to the equal wrapping force points are obtained through the second chart, and a first stiffness difference is determined based on the second wrapping stiffness and the second radial stiffness. The first stiffness difference is used to reflect the stiffness difference between the first wrapping stiffness and the second wrapping stiffness corresponding to the first wrapping displacement when the target tire completely wraps around the target bump. The third wrapping stiffness and the third radial stiffness corresponding to the equal wrapping displacement points are obtained through the third chart, and a second stiffness difference is determined based on the third wrapping stiffness and the third radial stiffness. The second stiffness difference reflects the stiffness difference between the first wrapping stiffness and the third wrapping stiffness corresponding to the first wrapping displacement when the target tire completely wraps around the target bump.

[0081] It should be noted that each module in the tire sheathing rigidity evaluation device in this application embodiment corresponds one-to-one with each implementation step of the tire sheathing rigidity evaluation method in Embodiment 1. Since Embodiment 1 has been described in detail, some details not shown in this embodiment can be referred to Embodiment 1, and will not be elaborated further here.

[0082] Example 3

[0083] According to an embodiment of this application, a non-volatile storage medium is also provided, which includes a stored program, wherein the device containing the non-volatile storage medium executes the tire sheathing stiffness evaluation method in Embodiment 1 by running the program.

[0084] Specifically, the device containing the non-volatile storage medium executes the following steps by running the program: obtaining a first chart of the target tire, wherein the first chart includes: a first relationship curve reflecting the first radial force and first radial displacement of the target tire's axle when the target tire moves to a road surface with a target bump and the target tire does not completely cover the target bump; and a second relationship curve reflecting the second radial force and second radial displacement of the target tire's axle when the target tire moves to a flat road surface; determining the covering force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve, respectively, and determining the first covering stiffness based on the covering force curve equation and the first radial stiffness based on the radial force curve equation; determining a second chart and a third chart of the target tire based on the first covering stiffness and the first radial stiffness, wherein the second chart reflects the bump covering capability of the target tire and the third chart reflects the radial displacement of the target tire's axle; and evaluating the bump covering stiffness of the target tire based on the second chart and the third chart.

[0085] According to an embodiment of this application, a processor is also provided for running a program, wherein the program executes the tire sheathing stiffness evaluation method of Embodiment 1 during runtime.

[0086] Specifically, the program executes the following steps during runtime: Obtaining a first graph of the target tire, wherein the first graph includes: a first relationship curve reflecting the relationship between the first radial force and the first radial displacement of the target tire's axle when the target tire moves to a road surface with a target bump and the target tire does not completely cover the target bump; and a second relationship curve reflecting the relationship between the second radial force and the second radial displacement of the target tire's axle when the target tire moves to a flat road surface; determining the covering force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve, respectively, and determining the first covering stiffness based on the covering force curve equation and the first radial stiffness based on the radial force curve equation; determining a second graph and a third graph of the target tire based on the first covering stiffness and the first radial stiffness, wherein the second graph reflects the bump covering capability of the target tire, and the third graph reflects the radial displacement of the target tire's axle; and evaluating the bump covering stiffness of the target tire based on the second graph and the third graph.

[0087] According to an embodiment of this application, an electronic device is also provided, comprising: a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the tire sheathing stiffness evaluation method of Embodiment 1 through the computer program.

[0088] Specifically, the processor is configured to execute the following steps via a computer program: acquiring a first chart of the target tire, wherein the first chart includes: a first relationship curve reflecting the first radial force and first radial displacement of the target tire's axle when the target tire moves to a road surface with a target bump and the target tire does not fully cover the target bump; and a second relationship curve reflecting the second radial force and second radial displacement of the target tire's axle when the target tire moves to a flat road surface; determining the covering force curve equation corresponding to the first relationship curve and the radial force curve equation corresponding to the second relationship curve, respectively, and determining a first covering stiffness based on the covering force curve equation and a first radial stiffness based on the radial force curve equation; determining a second chart and a third chart of the target tire based on the first covering stiffness and the first radial stiffness, respectively, wherein the second chart reflects the bump covering capability of the target tire and the third chart reflects the radial displacement of the target tire's axle; and evaluating the bump covering stiffness of the target tire based on the second chart and the third chart.

[0089] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0090] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0092] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0093] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0094] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0095] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for evaluating the rigidity of a tire bead, characterized by, The method comprises: obtaining a first graph of a target tire, wherein the first graph comprises: a first relationship curve of a first radial force and a first radial displacement of an axle of the target tire for reflecting that the target tire moves to a road surface provided with a target bump and the target tire does not completely cover the target bump; and a second relationship curve of a second radial force and a second radial displacement of the axle of the target tire for reflecting that the target tire moves to a flat road surface; determining a covering force curve equation corresponding to the first relationship curve and a radial force curve equation corresponding to the second relationship curve respectively, and determining a first covering stiffness according to the covering force curve equation and a first radial stiffness according to the radial force curve equation; determining a second graph and a third graph of the target tire based on the first covering stiffness and the first radial stiffness respectively, wherein the second graph is used to reflect a bump covering capacity of the target tire, and the third graph is used to reflect a radial displacement of the axle of the target tire; evaluating a bump covering stiffness of the target tire according to the second graph and the third graph; wherein, after obtaining the first graph of the target tire, the method further comprises: obtaining a first covering force and a first covering displacement of the target tire when the target tire completely covers the target bump; obtaining an equal covering force point in the second relationship curve equal to the first covering force, and obtaining an equal covering displacement point equal to the first covering displacement; determining a displacement difference based on the equal covering force point and the first covering displacement, and determining a radial force difference based on the first covering force and the equal covering displacement point, wherein the displacement difference is used to represent a height of the target bump, and the radial force difference is used to reflect an influence of the target bump on the target tire; wherein, the evaluating the bump covering stiffness of the target tire according to the second graph and the third graph comprises: obtaining a second covering stiffness and a second radial stiffness corresponding to the equal covering force point through the second graph, and determining a first stiffness difference according to the second covering stiffness and the second radial stiffness, wherein the first stiffness difference is used to reflect a stiffness difference between the first covering stiffness corresponding to the first covering displacement and the second covering stiffness when the target tire completely covers the target bump; obtaining a third covering stiffness and a third radial stiffness corresponding to the equal covering displacement point through the third graph, and determining a second stiffness difference according to the third covering stiffness and the third radial stiffness, wherein the second stiffness difference is used to reflect a stiffness difference between the first covering stiffness corresponding to the first covering displacement and the third covering stiffness when the target tire completely covers the target bump.

2. The method of claim 1, wherein, The method comprises: obtaining a first graph of a target tire, wherein the first graph comprises: a first relationship curve of a first radial force and a first radial displacement of an axle of the target tire for reflecting that the target tire moves to a road surface provided with a target bump and the target tire does not completely cover the target bump; and a second relationship curve of a second radial force and a second radial displacement of the axle of the target tire for reflecting that the target tire moves to a flat road surface; determining a covering force curve equation corresponding to the first relationship curve and a radial force curve equation corresponding to the second relationship curve respectively, and determining a first covering stiffness according to the covering force curve equation and a first radial stiffness according to the radial force curve equation; determining a second graph and a third graph of the target tire based on the first covering stiffness and the first radial stiffness respectively, wherein the second graph is used to reflect a bump covering capacity of the target tire, and the third graph is used to reflect a radial displacement of the axle of the target tire; evaluating a bump covering stiffness of the target tire according to the second graph and the third graph; wherein, after obtaining the first graph of the target tire, the method further comprises: obtaining a first covering force and a first covering displacement of the target tire when the target tire completely covers the target bump; obtaining an equal covering force point in the second relationship curve equal to the first covering force, and obtaining an equal covering displacement point equal to the first covering displacement; determining a displacement difference based on the equal covering force point and the first covering displacement, and determining a radial force difference based on the first covering force and the equal covering displacement point, wherein the displacement difference is used to represent a height of the target bump, and the radial force difference is used to reflect an influence of the target bump on the target tire; wherein, the evaluating the bump covering stiffness of the target tire according to the second graph and the third graph comprises: obtaining a second covering stiffness and a second radial stiffness corresponding to the equal covering force point through the second graph, and determining a first stiffness difference according to the second covering stiffness and the second radial stiffness, wherein the first stiffness difference is used to reflect a stiffness difference between the first covering stiffness corresponding to the first covering displacement and the second covering stiffness when the target tire completely covers the target bump; obtaining a third covering stiffness and a third radial stiffness corresponding to the equal covering displacement point through the third graph, and determining a second stiffness difference according to the third covering stiffness and the third radial stiffness, wherein the second stiffness difference is used to reflect a stiffness difference between the first covering stiffness corresponding to the first covering displacement and the third covering stiffness when the target tire completely covers the target bump. obtaining a second radial force and a second radial displacement of the wheel axis of the target tire when the target tire moves to a flat road surface, and determining a second relationship curve according to the second radial force and the second radial displacement; drawing the first relationship curve and the second relationship curve in the same graph with the radial displacement as the horizontal axis and the radial force as the vertical axis to obtain the first graph.

3. The method of claim 1, wherein, determining a first radial force curve equation corresponding to the first relationship curve and a second radial force curve equation corresponding to the second relationship curve, respectively, and determining a first radial stiffness according to the first radial force curve equation and a first radial stiffness according to the second radial force curve equation, including: obtaining the first radial force curve equation corresponding to the first relationship curve by using a polynomial fitting method, and obtaining the first radial stiffness by deriving the first radial force curve equation; obtaining the second radial force curve equation corresponding to the second relationship curve by using the polynomial fitting method, and obtaining the first radial stiffness by deriving the second radial force curve equation.

4. The method of claim 1, wherein, determining a second graph and a third graph of the target tire based on the first radial stiffness and the first radial stiffness, including: determining the second graph of the target tire according to the first radial stiffness and the first radial stiffness with the radial force as the horizontal axis and the radial stiffness as the vertical axis; determining the third graph of the target tire according to the first radial stiffness and the first radial stiffness with the radial displacement as the horizontal axis and the radial stiffness as the vertical axis.

5. The method of claim 1, wherein, The target bump is upwardly convex, and the cross-sectional shape of the target bump includes at least one of a square, a semicircle, an ellipse, and a triangle.

6. A device for evaluating the rigidity of tire bump covering, characterized in that, including: a obtaining module configured to obtain a first graph of a target tire, wherein the first graph includes a first relationship curve of a first radial force and a first radial displacement of a wheel axis of the target tire when the target tire moves to a road surface on which a target bump is placed and the target tire does not completely cover the target bump, and a second relationship curve of a second radial force and a second radial displacement of the wheel axis of the target tire when the target tire moves to a flat road surface; a first determining module configured to determine a first radial force curve equation corresponding to the first relationship curve and a second radial force curve equation corresponding to the second relationship curve, respectively, and determine a first radial stiffness according to the first radial force curve equation and a first radial stiffness according to the second radial force curve equation; a second determining module configured to determine a second graph and a third graph of the target tire based on the first radial stiffness and the first radial stiffness, wherein the second graph is used to reflect a bump covering capacity of the target tire, and the third graph is used to reflect a radial displacement of the wheel axis of the target tire; an evaluating module configured to evaluate a bump covering stiffness of the target tire according to the second graph and the third graph. The first covering force and the first covering displacement of the target tire when the target tire completely covers the target bump are obtained after the first graph of the target tire is obtained; an equal covering force point equal to the first covering force in the second relationship curve is obtained, and an equal covering displacement point equal to the first covering displacement is obtained; a displacement difference is determined based on the equal covering force point and the first covering displacement, and a radial force difference is determined based on the first covering force and the equal covering displacement point, wherein the displacement difference is used to represent the height of the target bump, and the radial force difference is used to reflect the influence of the target tire on the target bump; The evaluation of the bump covering rigidity of the target tire according to the second graph and the third graph includes: obtaining the second covering stiffness and the second radial stiffness corresponding to the equal covering force point through the second graph, and determining a first stiffness difference according to the second covering stiffness and the second radial stiffness, wherein the first stiffness difference is used to reflect the stiffness difference between the first covering stiffness corresponding to the first covering displacement and the second covering stiffness when the target tire completely covers the target bump; obtaining the third covering stiffness and the third radial stiffness corresponding to the equal covering displacement point through the third graph, and determining a second stiffness difference according to the third covering stiffness and the third radial stiffness, wherein the second stiffness difference is used to reflect the stiffness difference between the first covering stiffness corresponding to the first covering displacement and the third covering stiffness when the target tire completely covers the target bump.

7. A non-volatile storage medium, characterized by The non-volatile storage medium includes a stored program, wherein the device in which the non-volatile storage medium is located executes the evaluation method of the tire bump covering rigidity of any one of claims 1 to 5 by running the program.

8. An electronic device, comprising: It includes: The memory and the processor, wherein the memory stores a computer program, and the processor is configured to execute the evaluation method of the tire bump covering rigidity of any one of claims 1 to 5 by running the computer program.

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