Method and apparatus for testing rolling resistance in different zones

Abstract

The application provides a method and device for testing rolling resistance in different regions, and belongs to the technical field of regional testing, and comprises the following steps: 1, selecting a target tire as a test sample and obtaining basic parameters of the target tire; 2, performing longitudinal partition processing on the tread of the target tire to obtain five tread regions, and numbering any tread region; 3, based on a rolling resistance test device and shielding material, measuring the rolling resistance values of different left side, right side, shoulder and middle tire pattern regions respectively; and 4, evaluating the resistance of the target tire according to the rolling resistance values and the tire pattern. The application improves the test precision and optimizes the tire performance.

Description

Technical Field

[0001] This invention relates to the field of zonal testing technology, and more particularly to a method and apparatus for testing rolling resistance by zone. Background Technology

[0002] Currently, with the gradual increase in the penetration rate of new energy vehicles, the demand for high-profile, wide-section tires continues to grow, which in turn places higher demands on the rolling resistance performance of tires. Current technology only tests the rolling resistance of the entire tread area, without specifying the rolling resistance borne by each individual tread block. Automakers and tire suppliers should conduct research and development in this area to meet the market's demand for high-performance, environmentally friendly, and safe vehicles.

[0003] Furthermore, optimizing rolling resistance is particularly important for high-performance tires with high section width and low aspect ratio. With the rise of new energy electric vehicles, the increased vehicle weight makes improving tire rolling resistance even more urgent.

[0004] Therefore, the present invention proposes a method and apparatus for testing rolling resistance in different regions. Summary of the Invention

[0005] This invention provides a method and apparatus for testing rolling resistance in different regions, which refines the measurement and research of rolling resistance for each longitudinal tread block, and develops a tire tread structure with lower rolling resistance and better performance.

[0006] On one hand, the present invention provides a method for testing rolling resistance in different regions, comprising:

[0007] Step 1: Select the target tire as the test sample and obtain the basic parameters of the target tire;

[0008] Step 2: Divide the tread of the target tire longitudinally into five tread regions, and number each tread region.

[0009] Step 3: Based on the rolling resistance testing equipment and shielding material, measure the rolling resistance values ​​of different left, right, shoulder, and middle tire tread areas in groups;

[0010] Step 4: Evaluate the rolling resistance of the target tire based on the rolling resistance value and the tire tread pattern.

[0011] On the other hand, a target tire is selected as the test sample, and the basic parameters of the target tire are obtained, including:

[0012] Define the testing objectives and select the tire type accordingly;

[0013] Select representative target tires by tire type as test samples;

[0014] The basic parameters of the target tire are obtained based on the target tire's manufacturing information.

[0015] On the other hand, before longitudinally partitioning the tread of the target tire, the process includes:

[0016] Based on the image acquisition device, acquire the original image of the target tire tread;

[0017] The original tire tread image is processed into grayscale to obtain the first image, and the first image is mapped to the standard coordinate system;

[0018] The first image is processed by Gaussian filtering, and the gradient of any pixel is obtained as follows:

[0019] ;in, This represents the gradient magnitude at pixel (x, y). This represents the grayscale value of a pixel (x, y). This represents the gradient of pixel (x, y) in the x-direction. Let T represent the gradient of pixel (x, y) in the y-direction, and let T() represent the direction transformation function;

[0020] Based on the gradient of any pixel in the first image, and combined with a preset convolution kernel, a convolution operation is performed to obtain smooth pixels, and a second image is constructed based on all smooth pixels.

[0021] The gradient factor is used to scan any preset size of adjacent pixel group in the second image. If the gradient of any pixel in the adjacent pixel group is not a local maximum, the gradient of the pixel is suppressed to 0 to obtain the extreme value pixel.

[0022] The tread pattern image of the target tire is constructed based on all extreme pixel points.

[0023] On the other hand, the tread of the target tire is longitudinally divided into five tread regions, and each tread region is numbered, including:

[0024] Based on the basic parameters of the target tire, the tread pattern is divided into the left shoulder, the right shoulder, and the center tread pattern, with the left shoulder and the right shoulder being regarded as the first region and the second region, respectively.

[0025] Symmetry analysis of the central pattern, including central symmetry and axial symmetry;

[0026] Based on the distribution and symmetry of the central pattern, the central pattern is segmented from the center point of the image to both sides;

[0027] Based on the preset center width and preset side widths, the central pattern is symmetrically divided into the left image, the center image, and the right image, which are respectively regarded as the third region, the fourth region, and the fifth region.

[0028] On the other hand, based on rolling resistance testing equipment and shielding materials, rolling resistance values ​​were measured in groups for different left, right, shoulder, and center tire tread areas, including:

[0029] Select materials whose performance meets the preset standards as the shielding material;

[0030] The occluding material is cut based on the preset center width, preset single-sided width, and shoulder width to obtain the first material;

[0031] The first material is used to cover the first and third regions of the target tire to obtain the measurable right side region of the tire. Rolling resistance test is performed on the measurable right side region of the tire to obtain the first rolling resistance value.

[0032] The first material is used to cover the second and fifth regions of the target tire to obtain the measurable left side region of the tire. Rolling resistance is then tested on the measurable left side region of the tire to obtain the second rolling resistance value.

[0033] On the other hand, based on rolling resistance testing equipment and shielding materials, the rolling resistance values ​​of different left, right, shoulder, and center tire tread areas were measured in groups, and this also included:

[0034] The covering material is cut according to the preset center width, the preset total width of both sides, and the shoulder width to obtain the second material;

[0035] The second material is used to cover the first, third, fourth and fifth regions of the target tire to obtain the measurable right shoulder region of the tire. Rolling resistance test is performed on the measurable right shoulder region of the tire to obtain the third rolling resistance value.

[0036] The second material is used to cover the second, third, fourth and fifth regions of the target tire to obtain the measurable left shoulder region of the tire. Rolling resistance test is performed on the measurable left shoulder region of the tire to obtain the fourth rolling resistance value.

[0037] The covering material is cut according to the preset center width, preset side widths, and shoulder width to obtain the third material;

[0038] The third material is used to cover the first, second, third, and fifth regions of the target tire to obtain the measurable center region of the tire. Rolling resistance is then tested on the measurable center region of the tire to obtain the fifth rolling resistance value.

[0039] On the other hand, the rolling resistance of the target tire is evaluated based on the rolling resistance value combined with the tire tread pattern, including:

[0040] Based on the five rolling resistance values ​​of the target tire and the tire tread pattern, the resistance of the target tire is calculated as follows:

[0041] ;in, This indicates the resistance of the target tire. This represents the preset weighting coefficient for the i-th rolling resistance value. This indicates the standard tire rolling resistance coefficient. This indicates the factor that influences tire material on rolling resistance. This indicates the pattern proportion of the rolling resistance region corresponding to the i-th rolling resistance value. Let f represent the rated load weight of the target tire, and let f() represent the load function. This represents the rolling resistance coefficient corresponding to the speed v in the rolling resistance testing equipment. This represents the conversion factor related to the speed ratio. Indicates the specified standard speed of the target tire;

[0042] If the target tire resistance is greater than the preset resistance, the target tire tread pattern is deemed unqualified; otherwise, the target tire tread pattern is deemed qualified.

[0043] On the other hand, the present invention provides an apparatus for testing rolling resistance in sections, comprising:

[0044] Basic Parameters Module: Select the target tire as the test sample and obtain the basic parameters of the target tire;

[0045] Partitioning module: The tread of the target tire is longitudinally divided into five tread regions, and each tread region is numbered.

[0046] Measurement module: Based on rolling resistance testing equipment and shielding materials, the rolling resistance values ​​of different left, right, shoulder, and center tire tread areas are measured in groups.

[0047] Evaluation module: Evaluates the rolling resistance of the target tire based on its rolling resistance value.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0049] This invention provides a method and apparatus for testing rolling resistance in different regions, which refines the measurement and research of rolling resistance for each longitudinal tread block, and develops a tire tread structure with lower rolling resistance and better performance. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0051] Figure 1This is a flowchart illustrating the method for testing rolling resistance in different regions according to an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of the structure of the device for testing rolling resistance in different regions provided in an embodiment of the present invention;

[0053] Figure 3 This is a schematic diagram of the five regions after vertical partitioning;

[0054] Figure 4 This is a schematic diagram of the measurable right side area of ​​the tire;

[0055] Figure 5 This is a schematic diagram of the measurable left side area of ​​the tire;

[0056] Figure 6 This is a diagram showing the area on the right shoulder that can be measured by the tire;

[0057] Figure 7 This is a schematic diagram of the measurable central area of ​​the tire. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0059] Example 1:

[0060] like Figure 1 As shown, the method for testing rolling resistance by region provided in this embodiment of the invention includes:

[0061] Step 1: Select the target tire as the test sample and obtain the basic parameters of the target tire;

[0062] Step 2: Divide the tread of the target tire longitudinally into five tread regions, and number each tread region.

[0063] Step 3: Based on the rolling resistance testing equipment and shielding material, measure the rolling resistance values ​​of different left, right, shoulder, and middle tire tread areas in groups;

[0064] Step 4: Evaluate the rolling resistance of the target tire based on the rolling resistance value and the tire tread pattern.

[0065] In this embodiment, the target tire refers to a specific tire used as a sample in the test.

[0066] In this embodiment, the basic parameters refer to the basic characteristics and specifications of the tire, including: tire size, tire model, load index, etc.

[0067] In this embodiment, longitudinal partitioning refers to dividing the tire tread according to the longitudinal direction (i.e., parallel to the tire's driving direction).

[0068] In this embodiment, the tread area refers to the part of the tire that contacts the ground, that is, the surface pattern area of ​​the tire.

[0069] In this embodiment, numbering refers to assigning a specific number to the five zones of the tire.

[0070] In this embodiment, such as Figure 3 As shown, the five tread regions after partitioning are illustrated in the figure.

[0071] In this embodiment, the rolling resistance testing equipment measures rolling resistance by simulating the actual contact between a tire and the ground, using a dedicated test wheel and ground material.

[0072] In this embodiment, the shielding material is selected from materials with low coefficient of friction, high and low temperature resistance, and high plasticity, such as polytetrafluoroethylene (with a coefficient of friction of only 0.04) or metal materials with an even lower coefficient of friction.

[0073] In this embodiment, rolling resistance refers to the resistance generated by tire deformation, friction, and other factors when the tire contacts and rolls with the ground.

[0074] In this embodiment, the tire tread area refers to the different pattern areas on the tire surface.

[0075] The working principle and beneficial effects of the above technical solution are as follows: by dividing the tire tread into sections and measuring the rolling resistance value of each section using rolling resistance testing equipment, and combining the tread characteristics to evaluate the tire's resistance, it is possible to accurately analyze tire performance, optimize design, improve fuel efficiency and performance, and achieve significant energy-saving and environmental benefits.

[0076] Example 2:

[0077] Based on Example 1 above, a target tire is selected as the test sample, and the basic parameters of the target tire are obtained, including:

[0078] Define the testing objectives and select the tire type accordingly;

[0079] Select representative target tires by tire type as test samples;

[0080] The basic parameters of the target tire are obtained based on the target tire's manufacturing information.

[0081] In this embodiment, the test objective refers to the specific purpose to be achieved and the indicators to be evaluated when conducting tire performance tests.

[0082] In this embodiment, tire types are classified according to tire design, purpose, structure, and performance, such as off-road tires, traction tires, and highway tires.

[0083] In this embodiment, representativeness means that the selected tires can represent most tire characteristics of a particular type, ensuring that the test results have broad applicability.

[0084] In this embodiment, the factory information refers to the detailed technical and specification data about the tire provided by the manufacturer during the tire production process.

[0085] The working principle and beneficial effects of the above technical solution are as follows: by clearly defining the test objectives, selecting representative target tires, and obtaining their basic parameters, accurate data support is provided for subsequent testing. This process ensures the scientific validity and accuracy of the test results, optimizes tire design, and improves performance and fuel efficiency.

[0086] Example 3:

[0087] Based on the above embodiment 1, before longitudinally partitioning the tread of the target tire, the process includes:

[0088] Based on the image acquisition device, acquire the original image of the target tire tread;

[0089] The original tire tread image is processed into grayscale to obtain the first image, and the first image is mapped to the standard coordinate system;

[0090] The first image is processed by Gaussian filtering, and the gradient of any pixel is obtained as follows:

[0091] ;in, This represents the gradient magnitude at pixel (x, y). This represents the grayscale value of a pixel (x, y). This represents the gradient of pixel (x, y) in the x-direction. Let T represent the gradient of pixel (x, y) in the y-direction, and let T() represent the direction transformation function;

[0092] Based on the gradient of any pixel in the first image, and combined with a preset convolution kernel, a convolution operation is performed to obtain smooth pixels, and a second image is constructed based on all smooth pixels.

[0093] The gradient factor is used to scan any preset size of adjacent pixel group in the second image. If the gradient of any pixel in the adjacent pixel group is not a local maximum, the gradient of the pixel is suppressed to 0 to obtain the extreme value pixel.

[0094] The tread pattern image of the target tire is constructed based on all extreme pixel points.

[0095] In this embodiment, the image acquisition device is a device used to capture images of the target tire, such as a digital camera, industrial camera, or laser scanner.

[0096] In this embodiment, the original tread image is the original image data of the tire surface obtained by an image acquisition device.

[0097] In this embodiment, grayscale processing is a basic operation in image processing, which refers to the process of converting a color image into a grayscale image.

[0098] In this embodiment, the first image refers to the original image of the target tire tread after grayscale processing.

[0099] In this embodiment, the standard coordinate system refers to a mathematical reference frame used to determine the position of each pixel in the image.

[0100] In this embodiment, Gaussian filtering is a technique commonly used in image processing for denoising and blurring images. It smooths the image and reduces noise by applying a Gaussian function to the image during convolution.

[0101] In this embodiment, gradient refers to the rate at which the grayscale value of an image pixel changes with its spatial location.

[0102] In this embodiment, the direction transformation function transforms the gradient information of a pixel from one coordinate system to another.

[0103] In this embodiment, the preset convolution kernel refers to a predefined matrix used in the convolution operation to process pixels in the image.

[0104] In this embodiment, smoothed pixels refer to pixels that have had noise reduced in the image through filtering and convolution operations.

[0105] In this embodiment, the second image is an image generated based on the original first image and convolution kernel operations after Gaussian filtering and smoothing.

[0106] In this embodiment, the gradient factor represents the intensity coefficient of grayscale change at a certain point in the image.

[0107] In this embodiment, the preset size refers to using a fixed size for the region in image processing.

[0108] In this embodiment, a neighboring pixel group refers to a local area in the image processing process, which consists of several pixels surrounding a specific pixel in the image.

[0109] In this embodiment, a local maximum value refers to the pixel whose grayscale value or gradient value is the largest relative to the grayscale values ​​of other surrounding pixels within the neighborhood of a certain pixel.

[0110] In this embodiment, the extreme pixel refers to the pixel that satisfies local maximum suppression after being scanned by the gradient factor.

[0111] In this embodiment, the pattern image represents significant texture features in the tire tread.

[0112] The working principle and beneficial effects of the above technical solution are as follows: the tread pattern image of the target tire is extracted by image processing technology, and the tread pattern features are accurately identified and extracted by using grayscale processing, Gaussian filtering, gradient calculation and convolution operation, which improves the accuracy of tire tread analysis and helps to optimize tire design and performance evaluation.

[0113] Example 4:

[0114] Based on the above embodiment 1, the tread of the target tire is longitudinally divided into five tread regions, and each tread region is numbered, including:

[0115] Based on the basic parameters of the target tire, the tread pattern is divided into the left shoulder, the right shoulder, and the center tread pattern, with the left shoulder and the right shoulder being regarded as the first region and the second region, respectively.

[0116] Symmetry analysis of the central pattern, including central symmetry and axial symmetry;

[0117] Based on the distribution and symmetry of the central pattern, the central pattern is segmented from the center point of the image to both sides;

[0118] Based on the preset center width and preset side widths, the central pattern is symmetrically divided into the left image, the center image, and the right image, which are respectively regarded as the third region, the fourth region, and the fifth region.

[0119] In this embodiment, the shoulder refers to the area on both sides of the tire tread, which is the transition area connecting the central part of the tire and the sidewall of the tire.

[0120] In this embodiment, the center pattern is the pattern area in the middle part of the tire tread, usually located in the very center of the tire.

[0121] In this embodiment, the first region is the left portion of the tire shoulder.

[0122] In this embodiment, the second region is the right-side portion of the tire shoulder.

[0123] In this embodiment, symmetry analysis includes central symmetry and axial symmetry. Central symmetry refers to the symmetry of an image around a central point, while axial symmetry refers to the symmetry of an image around a central axis.

[0124] In this embodiment, the preset center width refers to the preset width of the "center pattern" area in the tire tread image.

[0125] In this embodiment, the preset width on both sides refers to the width of the two sides of the tire tread pattern in the tire tread pattern image, and the width on both sides is equal.

[0126] In this embodiment, the third region is located on the left side of the image and is the portion segmented to the left from the center point of the tire tread image.

[0127] In this embodiment, the fourth region is located at the center of the image.

[0128] In this embodiment, the fifth region is located on the right side of the image and is the portion segmented to the right from the center point of the tire tread image.

[0129] The working principle and beneficial effects of the above technical solution are as follows: by performing regional division and symmetry analysis on the target tire tread image, the center tread can be accurately identified and segmented into left, center and right regions, which helps to analyze the tire tread features in more detail and provides support for tire performance evaluation.

[0130] Example 5:

[0131] Based on Example 1 above, using rolling resistance testing equipment and shielding materials, rolling resistance values ​​were measured in groups for different left, right, shoulder, and center tire tread areas, including:

[0132] Select materials whose performance meets the preset standards as the shielding material;

[0133] The occluding material is cut based on the preset center width, preset single-sided width, and shoulder width to obtain the first material;

[0134] The first material is used to cover the first and third regions of the target tire to obtain the measurable right side region of the tire. Rolling resistance test is performed on the measurable right side region of the tire to obtain the first rolling resistance value.

[0135] The first material is used to cover the second and fifth regions of the target tire to obtain the measurable left side region of the tire. Rolling resistance is then tested on the measurable left side region of the tire to obtain the second rolling resistance value.

[0136] In this embodiment, shoulder width refers to the width of the area in the tire tread pattern image that is related to the outer shoulder of the tire.

[0137] In this embodiment, the first material refers to the material obtained by cutting the covering material according to the preset center width, single-side width and shoulder width.

[0138] In this embodiment, the measurable right-side area of ​​the tire is as follows: Figure 4 The unshaded area is shown.

[0139] In this embodiment, the first rolling resistance value refers to the result of rolling resistance testing on the measurable right side area of ​​the tire.

[0140] In this embodiment, the measurable left side area of ​​the tire is as follows: Figure 5 The unshaded area is shown.

[0141] In this embodiment, the second rolling resistance value refers to the result of rolling resistance testing performed on the measurable left side area of ​​the tire.

[0142] The working principle and beneficial effects of the above technical solution are as follows: By cutting and covering different areas of the tire with shielding material, rolling resistance tests are conducted to obtain the rolling resistance values ​​for the left and right sides of the tire. This method helps to evaluate the impact of different areas on tire rolling resistance performance and provides a basis for optimizing tire design.

[0143] Example 6:

[0144] Based on the above-described embodiment 1, and using rolling resistance testing equipment and shielding materials, the rolling resistance values ​​of different left, right, shoulder, and center tire tread areas are measured in groups, and the method further includes:

[0145] The covering material is cut according to the preset center width, the preset total width of both sides, and the shoulder width to obtain the second material;

[0146] The second material is used to cover the first, third, fourth and fifth regions of the target tire to obtain the measurable right shoulder region of the tire. Rolling resistance test is performed on the measurable right shoulder region of the tire to obtain the third rolling resistance value.

[0147] The second material is used to cover the second, third, fourth and fifth regions of the target tire to obtain the measurable left shoulder region of the tire. Rolling resistance test is performed on the measurable left shoulder region of the tire to obtain the fourth rolling resistance value.

[0148] The covering material is cut according to the preset center width, preset side widths, and shoulder width to obtain the third material;

[0149] The third material is used to cover the first, second, third, and fifth regions of the target tire to obtain the measurable center region of the tire. Rolling resistance is then tested on the measurable center region of the tire to obtain the fifth rolling resistance value.

[0150] In this embodiment, the second material is a material obtained by cutting the covering material according to the preset center width, the preset total width of both sides and the shoulder width.

[0151] In this embodiment, the tire can measure the right shoulder area, such as... Figure 6 The unshaded area is shown.

[0152] In this embodiment, the tire can be used to measure the left shoulder area. Figure 6 The symmetrical side.

[0153] In this embodiment, the third rolling resistance value is the value obtained by performing a rolling resistance test on the measurable right shoulder area of ​​the tire.

[0154] In this embodiment, the fourth rolling resistance value is the value obtained by performing a rolling resistance test on the measurable left shoulder area of ​​the tire.

[0155] In this embodiment, the third material is obtained by cutting the covering material according to the preset center width, the preset total width of both sides and the shoulder width.

[0156] In this embodiment, the measurable central area of ​​the tire is as follows: Figure 7 The unshaded area is shown.

[0157] In this embodiment, the fifth rolling resistance value is the rolling resistance test value of the measurable central area of ​​the tire.

[0158] The working principle and beneficial effects of the above technical solution are as follows: By cutting different blocking materials, rolling resistance tests are conducted on different areas of the tire to obtain the rolling resistance values ​​for different areas. This method helps to comprehensively evaluate the rolling resistance performance of the tire in different areas, providing data support for optimizing tire design and improving performance.

[0159] Example 7:

[0160] Based on the above embodiment 6, the resistance of the target tire is evaluated according to the rolling resistance value combined with the tire tread pattern, including:

[0161] Based on the five rolling resistance values ​​of the target tire and the tire tread pattern, the resistance of the target tire is calculated as follows:

[0162] ;in, This indicates the resistance of the target tire. This represents the preset weighting coefficient for the i-th rolling resistance value. This indicates the standard tire rolling resistance coefficient. This indicates the factor that influences tire material on rolling resistance. This indicates the pattern proportion of the rolling resistance region corresponding to the i-th rolling resistance value. Let f represent the rated load weight of the target tire, and let f() represent the load function. This represents the rolling resistance coefficient corresponding to the speed v in the rolling resistance testing equipment. This represents the conversion factor related to the speed ratio. Indicates the specified standard speed of the target tire;

[0163] If the target tire resistance is greater than the preset resistance, the target tire tread pattern is deemed unqualified; otherwise, the target tire tread pattern is deemed qualified.

[0164] In this embodiment, resistance refers to the rolling resistance generated by the target tire under specific conditions (speed, load, tire tread pattern).

[0165] In this embodiment, the standard tire rolling resistance coefficient refers to the rolling resistance coefficient generated by an idealized tire under specific conditions.

[0166] In this embodiment, the influence factor refers to the degree to which the tread pattern design contributes to the rolling resistance when calculating the rolling resistance of the target tire.

[0167] In this embodiment, the load function is a function used in tire testing and evaluation to describe the effect of load on rolling resistance.

[0168] In this embodiment, the rolling resistance area tread pattern ratio refers to the proportion of the tread pattern area on the tire surface that is directly related to rolling resistance.

[0169] In this embodiment, the preset resistance refers to the maximum permissible rolling resistance that the target tire should achieve according to certain standards or requirements when designing and evaluating the tire.

[0170] The working principle and beneficial effects of the above technical solution are as follows: by combining five rolling resistance values, tread pattern ratio, and load, the overall resistance of the target tire is calculated. If the resistance exceeds the preset value, the tire tread pattern is deemed unqualified, which helps ensure that tire performance meets regulations and improves the scientific nature and accuracy of tire design.

[0171] Example 8:

[0172] like Figure 2 As shown, an embodiment of the present invention provides an apparatus for testing rolling resistance in different regions, comprising:

[0173] Basic Parameters Module: Select the target tire as the test sample and obtain the basic parameters of the target tire;

[0174] Partitioning module: The tread of the target tire is longitudinally divided into five tread regions, and each tread region is numbered.

[0175] Measurement module: Based on rolling resistance testing equipment and shielding materials, the rolling resistance values ​​of different left, right, shoulder, and center tire tread areas are measured in groups.

[0176] Evaluation module: Evaluates the rolling resistance of the target tire based on its rolling resistance value.

[0177] The working principle and beneficial effects of the above technical solution are as follows: by dividing the tire tread into sections and measuring the rolling resistance value of each section using rolling resistance testing equipment, and combining the tread characteristics to evaluate the tire's resistance, it is possible to accurately analyze tire performance, optimize design, improve fuel efficiency and performance, and achieve significant energy-saving and environmental benefits.

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of testing rolling resistance in zones, characterized in that, The method comprises the following steps: Step 1: selecting a target tire as a test sample and obtaining basic parameters of the target tire; Step 2: longitudinally partitioning the tread of the target tire to obtain five tread regions, and numbering any tread region; Step 3: based on a rolling resistance test device and a shielding material, measuring the rolling resistance values of different left side, right side, shoulder and middle tire pattern regions in groups respectively; Step 4: evaluating the resistance of the target tire according to the rolling resistance values combined with the tire pattern; In step 2, the tread of the target tire is longitudinally partitioned to obtain five tread regions, and any tread region is numbered, which comprises: According to the basic parameters of the target tire, the pattern image is divided into left side shoulder, right side shoulder and center pattern, and the left side shoulder and the right side shoulder are regarded as the first region and the second region respectively; Symmetry analysis is performed on the center pattern, including center symmetry and axis symmetry; Based on the distribution and symmetry of the center pattern, the center pattern is segmented from the center point of the image to both sides; According to the preset center width and the preset two-side width, the center pattern is symmetrically segmented into a left side image, a center image and a right side image, which are regarded as the third region, the fourth region and the fifth region respectively; In step 3, based on the rolling resistance test device and the shielding material, the rolling resistance values of different left side, right side, shoulder and middle tire pattern regions are measured in groups respectively, which comprises: Selecting a material with performance meeting the preset standard as the shielding material; The shielding material is cut based on the preset center width, the preset single-side width and the shoulder width to obtain a first material; The first material is used to shield the first region and the third region of the target tire to obtain a measurable right side region of the tire, and the rolling resistance of the measurable right side region of the tire is tested to obtain a first rolling resistance value; The first material is used to shield the second region and the fifth region of the target tire to obtain a measurable left side region of the tire, and the rolling resistance of the measurable left side region of the tire is tested to obtain a second rolling resistance value; Based on the rolling resistance test device and the shielding material, the rolling resistance values of different left side, right side, shoulder and middle tire pattern regions are measured in groups respectively, which further comprises: The shielding material is cut based on the preset center width, the preset two-side width total value and the shoulder width to obtain a second material; The second material is used to shield the first region, the third region, the fourth region and the fifth region of the target tire to obtain a measurable right side shoulder region of the tire, and the rolling resistance of the measurable right side shoulder region of the tire is tested to obtain a third rolling resistance value; The second material is used to shield the second region, the third region, the fourth region and the fifth region of the target tire to obtain a measurable left side shoulder region of the tire, and the rolling resistance of the measurable left side shoulder region of the tire is tested to obtain a fourth rolling resistance value; The shielding material is cut based on the preset center width, the preset two-side width and the shoulder width to obtain a third material; The third material is used to shield the first region, the second region, the third region and the fifth region of the target tire to obtain a measurable center region of the tire, and the rolling resistance of the measurable center region of the tire is tested to obtain a fifth rolling resistance value.

2. The method of zoned testing of rolling resistance according to claim 1, characterized in that, The method for selecting a target tire as a test sample and obtaining basic parameters of the target tire comprises the following steps: Clearly test target, and select tire type according to test target; Select representative target tire in tire type as test sample; Obtain basic parameters of target tire according to factory information of target tire.

3. The method of zoned testing of rolling resistance according to claim 1, characterized in that, Before longitudinal partition processing of target tire tread, comprising: Based on image acquisition device, obtain original image of target tire tread; Carry out gray processing on original image of target tire tread, obtain first image, and map first image to standard coordinate system; Carry out Gaussian filtering processing on first image, and obtain gradient of any pixel point as: ; wherein denotes the gradient magnitude of pixel point (x, y), denotes the gray value of pixel point (x, y), denotes the gradient of pixel point (x, y) in the x direction, denotes the gradient of pixel point (x, y) in the y direction, and T() denotes a direction conversion function; Based on gradient of any pixel point in first image, and combined with preset convolution kernel, carry out convolution operation to obtain smooth pixel point, and based on all smooth pixel points, second image is constituted; Using gradient factor, scan any preset size adjacent pixel group of second image, if gradient of any pixel point in adjacent pixel group is not local maximum value, suppress corresponding pixel point gradient to 0, and obtain extreme value pixel point; Based on all extreme value pixel points, constitute pattern image of target tire.

4. The method of zoned testing of rolling resistance according to claim 3, characterized in that, According to rolling resistance value, evaluate resistance of target tire combined with tire pattern, comprising: According to five rolling resistance values of target tire, combined with tire pattern, calculate resistance of target tire as: ; wherein, represents the resistance of the target tire, represents a preset weight coefficient of the ith rolling resistance value, represents a standard tire rolling resistance coefficient, represents a tire material influence factor on rolling resistance, represents a pattern proportion of the rolling resistance region corresponding to the ith rolling resistance value, represents the rated load gravity of the target tire, and f() represents a load function, represents a rolling resistance coefficient corresponding to the speed v in the rolling resistance test device, represents a conversion coefficient related to the speed ratio, represents a prescribed standard speed of the target tire; If resistance of target tire is greater than preset resistance, determine that pattern of target tire is unqualified, otherwise, determine that pattern of target tire is qualified.

5. Apparatus for testing the rolling resistance in subareas, based on the method for testing the rolling resistance in subareas according to any one of claims 1 to 4, characterized in that Comprising: Basic parameter module: select target tire as test sample, and obtain basic parameters of target tire; Partition module: longitudinal partition processing is carried out on the tread of the target tire, five tread areas are obtained, and any tread area is numbered; Measurement module: based on rolling resistance test equipment and shielding material, the rolling resistance values of different left side, right side, shoulder and middle tire pattern areas are measured respectively in groups; Evaluation module: evaluate the resistance of the target tire according to the rolling resistance value.

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