A test method, application, device and computer program product for lateral hydroplaning of a passenger car tire

Abstract

This application relates to tire testing methods, and more particularly to a method, application, apparatus, and computer program product for testing the lateral hydroplaning of passenger car tires. This method evaluates the tire's hydroplaning performance by obtaining the lateral acceleration at different vehicle speeds when the vehicle enters a designated test curve and then calculating a hydroplaning evaluation index using a specified formula.

Description

Technical Field

[0001] The present application relates to a tire testing method, and more particularly to a method, application, device, and computer program product for testing lateral hydroplaning of a passenger car tire. Background Art

[0002] When a tire is driving on a flat road with accumulation of water, as the speed increases, the water film area between the tread and the road surface expands, the adhesion decreases, and the tire slides on the water surface. This phenomenon is called tire hydroplaning (English terminology: aquaplaning or hydroplaning).

[0003] Tire hydroplaning performance can generally be categorized as lateral and longitudinal. A hydroplaning phenomenon that occurs on a curved road is called lateral hydroplaning, while a hydroplaning phenomenon that occurs on a straight road is called longitudinal hydroplaning. Tire hydroplaning performance is a key indicator for evaluating tire wet performance and is crucial to driving safety, attracting increasing attention from automakers. Hydroplaning performance complements a tire's wet grip performance, providing a comprehensive assessment of a tire's wet safety capabilities.

[0004] Vehicle performance in Europe is often prioritized for wetland performance, and many vehicle and tire manufacturers have specific requirements for aquaplaning performance. The German Association of the Automotive Industry (VDA) has recommended test methods for aquaplaning. However, in China, there are no unified testing methods or indicators for aquaplaning performance, and aquaplaning testing is still in its exploratory stages. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a test method for lateral hydroplaning of passenger car tires. The method obtains the lateral acceleration at different vehicle speeds when the vehicle enters a specified test curve, and then calculates the hydroplaning evaluation index through a specified formula to evaluate the hydroplaning performance of the tire.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A method for testing lateral hydroplaning of a car tire, characterized in that the method comprises the following steps:

[0008] 1) The lateral hydroplaning test is conducted on a curve with a uniform and stable water film thickness. Before the test begins, the driver drives the test vehicle into the test curve at a constant speed, keeping the vehicle's steering wheel angle and accelerator pedal position constant.

[0009] 2) The test starts at a speed of 30-50 km / h and gradually increases to 4-10 km / h. The actual vehicle speed V and the vehicle's lateral acceleration A are recorded by the test equipment during the test; they are recorded as (V1, A1), (V2, A2), ..., (Vn , A n );

[0010] 3) When the vehicle speed reaches 100-110 km / h, stop the test;

[0011] 4) Select the test data and calculate the tire lateral hydroplaning performance evaluation index HP according to the following formula:

[0012]

[0013] Preferably, in step 2), the test starts at a speed of 45 km / h and gradually increases by 5 km / h; in step 3), the test is stopped when the vehicle speed reaches 100 km / h.

[0014] Furthermore, the present application also provides an application of the described method for evaluating the lateral hydroplaning of a passenger car tire, wherein a larger value of the evaluation index HP indicates a better lateral hydroplaning performance of the tire.

[0015] Furthermore, the present application also provides a computer device, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the following method:

[0016] 1) obtaining the test data described in step 4) of the method;

[0017] 2) Calculate the tire's lateral hydroplaning performance evaluation index HP according to the following formula:

[0018]

[0019] Furthermore, the present application also provides a computer-readable storage medium having a computer program or instruction stored thereon, which implements the following method when executed by a processor:

[0020] 1) obtaining the test data described in step 4) of the method;

[0021] 2) Calculate the tire's lateral hydroplaning performance evaluation index HP according to the following formula:

[0022]

[0023] Furthermore, the present application also provides a computer program product, including a computer program or instructions, which implements the following method when executed by a processor:

[0024] 1) obtaining the test data described in step 4) of the method;

[0025] 2) Calculate the tire's lateral hydroplaning performance evaluation index HP according to the following formula:

[0026]

[0027] The present invention adopts the above-mentioned technical solution. The method obtains the lateral acceleration at different vehicle speeds when the vehicle enters a specified test curve, and then calculates the water drift evaluation index through a specified formula to evaluate the water drift performance of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Flowchart of car tire lateral hydroplaning test and data processing.

[0029] Figure 2 Graph showing the relationship between the actual vehicle speed V and the lateral acceleration A of a 195 / 65 R15 tire. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further illustrated below through specific examples.

[0031] Example 1

[0032] 1. Using a 195 / 65 R15 tire as an example, the driver drives the test vehicle into the test curve at a constant speed, maintaining a constant steering wheel angle and accelerator pedal position. The lateral hydroplaning test is conducted on a curve with a uniform and stable water film thickness.

[0033] 2. The test begins at 45 km / h and gradually increases in 5 km / h increments. The actual vehicle speed V and lateral acceleration A are recorded using the test equipment. The data is shown in Table 2.

[0034] Table 2 195 / 65 R15 tire lateral hydroplaning test data record

[0035] Serial number Theoretical speed (km / h) Actual vehicle speed V (km / h) Lateral acceleration A (m / s2) 1 45 45.26 1.67 2 50 50.62 2.09 3 55 55.19 2.54 4 60 59.39 3.25 5 65 66.20 3.47 6 70 70.92 3.91 7 75 75.13 3.72 8 80 80.21 3.53 9 85 85.79 3.02 10 90 90.91 2.60 11 95 95.10 2.56 12 100 100.34 2.03

[0036] 3. When the vehicle speed reaches 100km / h, stop the test.

[0037] 4. Select data from vehicle speeds ranging from 45 km / h to 100 km / h and calculate the tire lateral hydroplaning performance evaluation index HP according to formula (1). The calculated result is HP = 163.09.

[0038] Example 2

[0039] 1. Using a 205 / 55 R16 tire as an example, the driver drives the test vehicle into the test curve at a constant speed, maintaining a constant steering wheel angle and accelerator pedal position. The lateral hydroplaning test is conducted on a curve with a uniform and stable water film thickness.

[0040] 2. The test begins at 45 km / h and gradually increases in 5 km / h increments. The actual vehicle speed V and lateral acceleration A are recorded using the test equipment. The data is shown in Table 2.

[0041] Table 2 205 / 55 R16 tire lateral hydroplaning test data record

[0042] Serial number Theoretical speed (km / h) Actual vehicle speed V (km / h) Lateral acceleration A (m / s2) 1 45 45.03 1.33 2 50 50.71 1.91 3 55 54.99 2.26 4 60 59.46 2.85 5 65 65.37 3.18 6 70 69.96 3.49 7 75 75.14 3.56 8 80 79.61 3.23 9 85 85.46 2.71 10 90 90.23 2.38 11 95 95.30 2.22 12 100 100.11 1.75

[0043] 3. When the vehicle speed reaches 100km / h, stop the test.

[0044] 4. Select data from vehicle speeds ranging from 45 km / h to 100 km / h and calculate the tire lateral hydroplaning performance evaluation index HP according to formula (1). The calculated result is HP = 146.8.

[0045] From the above Examples 1 and 2, it can be seen that the HP value of the 195 / 65 R15 tire is greater than that of the 205 / 55 R16 tire, and the lateral hydroplaning performance of the 195 / 65R15 tire is better than that of the 205 / 55 R16 tire. This also proves that the conclusion of the present application that the larger the HP value, the better the lateral hydroplaning performance of the tire is consistent with reality.

[0046] The above is a description of the embodiments of the present invention. The above description of the disclosed embodiments will enable those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for testing lateral hydroplaning of a car tire, characterized in that: The method comprises the following steps: 1) The lateral hydroplaning test is conducted on a curve with a uniform and stable water film thickness. Before the test begins, the driver drives the test vehicle into the test curve at a constant speed, maintaining a constant steering wheel angle and accelerator pedal position. 2) The test starts at a speed of 30-50 km / h and gradually increases to 4-10 km / h; the actual vehicle speed during the test is recorded by the test equipment V The lateral acceleration of the vehicle A ; respectively recorded as ( , )、( , ),……、( , ); 3) When the vehicle speed reaches 100-110 km / h, stop the test; 4) Select the test data and calculate the tire lateral hydroplaning performance evaluation index HP according to the following formula: ； The larger the HP value is, the better the tire's lateral hydroplaning performance is.

2. A method for testing lateral hydroplaning of a car tire according to claim 1, characterized in that: In step 2), the test starts at a speed of 45 km / h and gradually increases by 5 km / h; in step 3), the test is stopped when the vehicle speed reaches 100 km / h.

3. A computer device comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the following method: 1) obtaining the test data described in step 4) of the method according to any one of claims 1 to 2; 2) Calculate the tire's lateral hydroplaning performance evaluation index HP according to the following formula: ； The larger the HP value is, the better the tire's lateral hydroplaning performance is.

4. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: When the computer program or instructions are executed by a processor, the following method is implemented: 1) obtaining the test data described in step 4) of the method according to any one of claims 1 to 2; 2) Calculate the tire's lateral hydroplaning performance evaluation index HP according to the following formula: ； The larger the HP value is, the better the tire's lateral hydroplaning performance is.

5. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instructions are executed by a processor, the following method is implemented: 1) obtaining the test data described in step 4) of the method according to any one of claims 1 to 2; 2) Calculate the tire's lateral hydroplaning performance evaluation index HP according to the following formula: ； The larger the HP value is, the better the tire's lateral hydroplaning performance is.

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