Tire bulge test method

Abstract

The application discloses a kind of tire bulge test methods, belong to tire performance test field.The method includes data acquisition step, data processing step, control step;Data acquisition step includes the first displacement value when using infrared laser range finder device measurement tread bulge, the second displacement value when side bulge, the third displacement value when shoulder bulge, and the fourth displacement value when tire outer sub mouth bulge;Data processing step includes the first displacement value, the second displacement value, the third displacement value, the fourth displacement value are transmitted to computer control system by infrared explosion-proof industrial computer, and computer control system transmits data to the industrial computer of high-speed endurance testing machine;Control step includes if exceeding the displacement amount set, then default tire bulge, equipment shutdown.The application is applied to tire bulge test aspect, solves the problem that existing high-speed endurance testing machine tire bulge control system method exists operation complex, test result is not accurate, with the characteristics of test result accurate.

Description

Technical Field

[0001] This invention belongs to the field of tire performance testing, and in particular relates to a method for testing tire bulges. Background Technology

[0002] Existing high-speed durability testing machines' tire bulge control systems mostly employ national standard methods, manual inspection and monitoring of tire bulges, or the use of explosion-proof forks to monitor tire bulges. Currently, high-speed durability performance testing of tires is conducted using a high-speed durability testing machine, employing national standards GB / T 4501-2016 "Indoor Test Methods for Performance of Heavy-Duty Truck Tires" and GB / T4502-2016 "Indoor Test Methods for Performance of Passenger Car Tires." Manual inspection and monitoring of tire bulges involves setting a time limit for tire stopping on the high-speed durability testing machine. After the machine stops and cools for 15-25 minutes, the tire is inspected for bulges or damage. However, this method suffers from low safety, operational difficulties, time waste, and the inability to promptly determine the timing of bulges or damage. Monitoring tire bulges using anti-burst forks involves installing anti-burst forks on both sides of the tire while it is rotating at high speed. When a bulge occurs, the forks are triggered, stopping the equipment. However, this method has the following drawbacks: the distance between the anti-burst forks and the tire needs to be manually set, which is difficult to control. If the distance is too large, the bulge may not reach the forks; if the distance is too small, due to tire manufacturing processes, the tire may easily touch the forks while rolling. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the technical problem to be solved by the present invention is to overcome the problems of complex operation and inaccurate test results of the existing tire bulge control system method of high-speed durability testing machine, and to propose a tire bulge test method with accurate test results.

[0004] To solve the aforementioned technical problem, the technical solution adopted by the present invention is as follows:

[0005] This invention discloses a method for testing tire bulges, including a data acquisition step, a data processing step, and a control step;

[0006] The data acquisition steps include using an infrared laser rangefinder to measure the first displacement value when the tire tread bulges, the second displacement value when the tire sidewall bulges, the third displacement value when the tire shoulder bulges, and the fourth displacement value when the tire bead bulges.

[0007] The data processing steps include transmitting the first displacement value, the second displacement value, the third displacement value, and the fourth displacement value to the computer control system via an infrared explosion-proof industrial control computer, and the computer control system transmitting the data to the industrial control computer of the high-speed durability testing machine;

[0008] The control procedure includes defaulting to a tire bulge and stopping the equipment if the displacement exceeds the set amount.

[0009] Preferably, the data acquisition step further includes: the AC motor drives the high-speed durability testing machine rollers to perform tests at an initial speed of 200 km / h, the infrared laser rangefinder device has an acquisition frequency of 1024 Hz, after the tire is preheated for 30 minutes, the infrared laser rangefinder device collects the average value of the displacement after 3 minutes of preheating as the initial displacement, and after 3 minutes, the infrared laser rangefinder device continuously collects data.

[0010] Preferably, the infrared laser rangefinder device includes three tread infrared laser rangefinders on the left tread, the center of the tread, and the right tread; two shoulder infrared laser rangefinders on the right shoulder and the left shoulder; two sidewall infrared laser rangefinders on the right sidewall and the left sidewall; and two outer rim infrared laser rangefinders on the right outer rim and the left outer rim.

[0011] Preferably, the data processing step further includes: filtering the collected data using a low-pass elliptic filter, obtaining the average value L1 after filtering, subtracting it from the initial displacement L2 to obtain the displacement difference L3, and so on. If the displacement difference L3 equals 1 mm, then record the time point A1 and record the data. When the displacement difference L3 equals 2 mm, record the time point A2. Perform a cubic polynomial fitting on the displacement difference data between time points A1 and A2 to obtain the fitting curve formula, i.e.

[0012] L = a*(t - A1) 3 +b*(t-A1) 2 +c*(t-A1)+d

[0013] Where L represents the displacement difference, t represents the test time, and a, b, c, and d are constant values ​​of the fitted data curve. Calculate the slope K of the polynomial L when t = A1.

[0014] Preferably, the control steps further include: the test system collects data from each infrared laser rangefinder; if K ≥ 0.01 mm / s and L3 ≥ 2 mm for one of the data channels, the data is transmitted to the computer control system via the infrared explosion-proof industrial control computer, and the system alarm device stops.

[0015] Preferably, the computer control system adopts a control system based on the combination of Matlab and industrial computer. The algorithm is completed in Simulink of the upper computer Matlab, the industrial computer is responsible for the acquisition and output of real-time data, and the data of the lower computer is realized through OPC technology. The interface of the tire bulge test control system is designed using the GUI graphical interface in Matlab.

[0016] Preferably, the infrared laser rangefinder device further includes a support frame, a sliding sleeve connected to the support frame, a telescopic rod connected to the sliding sleeve, and a dedicated rangefinder device.

[0017] Preferably, the three tread laser rangefinders are adjustable left and right in the sliding sleeve of the rangefinder device according to the tire size and tread pattern design. The front and back distance is adjusted by the telescopic rod. Data is collected on the distance between the tire tread blocks, avoiding the collection of the distance between the tread grooves. The tire bead rangefinder, tire shoulder rangefinder, and tire sidewall rangefinder are adjusted in position according to the tire size by the telescopic rod and the sliding sleeve, and then fine-tuned by the rangefinder device to accurately test the position of the bead, tire shoulder, and tire sidewall.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention discloses a tire bulge testing method, which uses an infrared laser rangefinder to measure the size of bulges on the tire tread, shoulder, sidewall, and bead, and effectively outputs the location of the tire bulge through a computer control system, resulting in more accurate measurement results. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the test process of the tire bulge test method provided in the embodiment of the present invention;

[0021] Figure 2 This is an interface diagram of the computer control system of the tire bulge testing method provided in an embodiment of the present invention;

[0022] Figure 3 This is a control flowchart of the computer control system for the tire bulge testing method provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the infrared laser rangefinder device provided in an embodiment of the present invention;

[0024] Figure 5 This is another structural schematic diagram of the infrared laser rangefinder device provided in an embodiment of the present invention;

[0025] The following are the components in the above figures: 1. Tire tread infrared laser rangefinder; 2. Tire shoulder infrared laser rangefinder; 3. Tire sidewall infrared laser rangefinder; 4. Outer tire infrared laser rangefinder; 5. Support frame; 6. Sliding sleeve; 7. Telescopic rod; 8. Rangefinder special device; 9. High-speed durability testing machine; 10. Tire. Detailed Implementation

[0026] The technical solutions in specific embodiments of the present invention will now be described in detail and completely with reference to the accompanying drawings. Obviously, the described embodiments are merely some specific implementations of the overall technical solution of the present invention, and not all implementations. Based on the overall concept of the present invention, all other embodiments obtained by those skilled in the art fall within the protection scope of the present invention.

[0027] This invention discloses a method for testing tire bulges, such as... Figure 1 As shown, the method includes data acquisition, data processing, and control steps. The data acquisition step involves using an infrared laser rangefinder to measure the first displacement value of a tread bulge, the second displacement value of a sidewall bulge, the third displacement value of a shoulder bulge, and the fourth displacement value of a bead bulge. The data processing step involves transmitting the first, second, third, and fourth displacement values ​​to a computer control system via an infrared explosion-proof industrial control computer. The computer control system then transmits the data to the industrial control computer of the high-speed durability testing machine. The control step involves defaulting to a tire bulge and stopping the equipment if the displacement exceeds a set amount. This tire bulge testing method uses an infrared laser rangefinder to measure the size of bulges on the tire tread, shoulder, sidewall, and bead, and effectively outputs the location of the tire bulge through a computer control system, resulting in more accurate measurement results. For example... Figure 2 , 3 As shown, the computer control system's display interface includes alarm information, bulge size, and bulge location. It can effectively output the location and size of the tire bulge. When a tire bulge is detected, the test stops, effectively preventing the test from continuing even when the tire is damaged, which could lead to a tire blowout and damage to the equipment. After a tire bulge is identified, the bulge area can be cut using an existing tire line cut tester to analyze the cause of the bulge.

[0028] In a preferred embodiment, the data acquisition step further includes: driving the high-speed durability testing machine rollers with an AC motor at an initial speed of 200 km / h for testing; the infrared laser rangefinder device has an acquisition frequency of 1024 Hz; after the tire is preheated for 30 minutes, the infrared laser rangefinder device collects the average displacement over 3 minutes after preheating as the initial displacement; after 3 minutes, the infrared laser rangefinder device continuously acquires data. Regarding the testing method, taking a tire specification of 205 / 55R16, speed rating V, and load index 91 as an example, the tire and rim are assembled, and the high-speed performance test of the tire is conducted according to the national standard GB / T 4502-2016 "Indoor Test Method for Passenger Car Tire Performance," with an air pressure of 300 kPa, a load of 73% of the maximum load, and an ambient temperature of 38 ± 3℃. In a preferred embodiment, the infrared laser rangefinder device includes three tread infrared laser rangefinders located on the left tread, tread center, and right tread; two shoulder infrared laser rangefinders located on the right and left shoulders; two sidewall infrared laser rangefinders located on the right and left sidewalls; and two bezel infrared laser rangefinders located on the right and left outer bezels. Based on the tire specification of 205 / 55R16, adjust the positions of the three tread infrared laser rangefinders (left tread, tread center, and right tread), the two shoulder infrared laser rangefinders (right and left shoulders), the two sidewall infrared laser rangefinders (right and left sidewalls), and the two bezel infrared laser rangefinders (right and left outer bezels). Specific sensor positions are detailed below. Figure 4 and Figure 5 .like Figure 4 , 5 As shown, the infrared laser rangefinder device also includes a support frame, a sliding sleeve connected to the support frame, a telescopic rod connected to the sliding sleeve, and a dedicated rangefinder device. In a preferred embodiment, the three tire tread laser rangefinders are adjustable left and right within the sliding sleeve of the dedicated rangefinder device according to the tire's size and tread pattern design. The front-to-back distance is adjusted by the telescopic rod, collecting data on the distance between tire tread blocks and avoiding the collection of tread groove distances. The tire bead rangefinder, shoulder rangefinder, and sidewall rangefinder are adjusted according to the tire size using the telescopic rod and the sliding sleeve, and then fine-tuned by the dedicated rangefinder device to accurately test the positions of the bead, shoulder, and sidewall.

[0029] The data processing steps specifically include: filtering the collected data using a low-pass elliptic filter, calculating the average value L1 after filtering, subtracting it from the initial displacement L2 to obtain the displacement difference L3, and so on. If the displacement difference L3 equals 1 mm, record the time point A1 and the data. When the displacement difference L3 equals 2 mm, record the time point A2. Perform a cubic polynomial fitting on the displacement difference data between time points A1 and A2 to obtain the fitting curve formula, i.e.

[0030] L = a*(t - A1) 3 +b*(t-A1) 2 +c*(t-A1)+d

[0031] Where L represents the displacement difference, t represents the test time, and a, b, c, and d are constant values ​​of the fitted data curve. Calculate the slope K of the polynomial L when t = A1.

[0032] The control steps specifically include: the test system collects data from each infrared laser rangefinder; if K ≥ 0.01 mm / s and L3 ≥ 2 mm for one of the data channels, the data is transmitted to the computer control system via the infrared explosion-proof industrial control computer, and the system alarm device stops.

[0033] In a preferred embodiment, the computer control system adopts a control system based on a combination of Matlab and an industrial computer. The algorithm is completed in Simulink of the upper computer Matlab, the industrial computer is responsible for the acquisition and output of real-time data, and the data of the lower computer is realized through OPC technology. The interface of the tire bulge test control system is designed using the GUI graphical interface in Matlab.

[0034] To provide a clearer and more detailed description of the tire bulge testing method provided by the embodiments of the present invention, the following description will be based on specific embodiments.

[0035] Example 1

[0036] 1. The testing apparatus includes:

[0037] Tire tread infrared laser rangefinder: measures the displacement of a tire tread bulge.

[0038] Sidewall infrared laser rangefinder: measures the size of tire sidewall bulges.

[0039] Tire shoulder infrared laser rangefinder: measures the displacement of a tire shoulder bulge.

[0040] Outer tire bead infrared laser rangefinder: measures the displacement of a tire when there is a bulge in the outer tire bead.

[0041] Support bracket for the rangefinder: Support bracket for four types of infrared laser rangefinders: tread, sidewall, shoulder, and bezel.

[0042] Infrared explosion-proof industrial control computer: signal input and output processing device.

[0043] Computer control system interface: mainly displays tire bulge information and alarm information.

[0044] The aforementioned testing device measures the displacement values ​​of the tire tread, sidewall, shoulder, and bezel using four types of infrared laser rangefinders. These displacement values ​​are then transmitted to a computer control system via an infrared explosion-proof industrial control computer. The computer control system then transmits the data to the industrial control computer of the high-speed durability testing machine. If the displacement exceeds the set limit, a tire bulge is detected by default, and the equipment shuts down. For details on the tire bulge control system, please refer to [link to details]. Figure 2 , 3 .

[0045] 2. Testing Method:

[0046] ① Taking tire specification 205 / 55R16, speed rating V, and load index 91 as an example, assemble the tire and rim, and conduct high-speed tire performance test according to the national standard GB / T 4502-2016 "Indoor Test Method for Passenger Car Tire Performance", with air pressure of 300kPa, load of 73% of the maximum load, and room temperature of 38±3℃.

[0047] ② Based on the tire specification of 205 / 55R16, adjust the positions of the three infrared laser rangefinders on the tire tread (left tread, tire center, right tread), the two infrared laser rangefinders on the tire shoulder (right tire shoulder, left tire shoulder), the two infrared laser rangefinders on the tire sidewall (right tire sidewall, left tire sidewall), and the two infrared laser rangefinders on the outer bezel (right outer bezel, left outer bezel). See [link to specific sensor positions] for details. Figure 4 and Figure 5 .

[0048] ③ The high-speed durability testing machine rollers driven by AC motors were tested at an initial speed of 200 km / h. The infrared laser rangefinder collected data at a frequency of 1024 Hz. The first 30 minutes of the tire test was a tire preheating test (to avoid changes in the position values ​​of various parts of the tire due to heat generation). After 30 minutes of preheating, the infrared laser rangefinders of each part collected the average displacement of the displacement over the past 3 minutes as the initial displacement. Then, after 3 minutes, the infrared laser rangefinders of each part continuously collected data.

[0049] ④ Data Analysis: First, the collected data is filtered using a low-pass elliptic filter. The average value L1 is then calculated, and the difference between this average and the initial displacement L2 is used to obtain the displacement difference L3.

[0050] L3 = L1 - L2

[0051] Similarly, if the displacement difference L3 equals 1 mm, record the time point A1 and the data. When the displacement difference L3 equals 2 mm, record the time point A2. Perform a cubic polynomial fitting on the displacement difference data between time points A1 and A2 to obtain the fitting curve formula, i.e.

[0052] L = a*(t - A1) 3 +b*(t-A1) 2 +c*(t-A1)+d

[0053] Where L represents the displacement difference, t represents the test time, and a, b, c, and d are constant values ​​of the fitted data curve. Calculate the slope K of polynomial L when t = A1.

[0054] ⑤ Determination of tire bulges: Each data channel is analyzed and judged separately. The test system collects data from 9 infrared laser rangefinders. If K ≥ 0.01 mm / s and L3 ≥ 2 mm in one of the data channels, the data is transmitted to the computer control system through the infrared explosion-proof industrial control computer, and the system alarm device stops.

[0055] ⑥ This system is designed based on a control system combining Matlab and an industrial computer. The algorithm is implemented in the Simulink interface of the Matlab host computer, while the industrial computer is responsible for real-time data acquisition and output. Data from the slave computer is implemented using OPC technology. The interface of the tire bulge test control system is designed using the GUI graphical interface in Matlab. See [link to specific interface of tire bulge test control system] for details. Figure 2 .

[0056] ⑦ See details of the test steps. Figure 1 .

Claims

1. A method for testing tire bulges, characterized in that, This includes data acquisition steps, data processing steps, and control steps; The data acquisition steps include using an infrared laser rangefinder to measure the first displacement value when the tire tread bulges, the second displacement value when the tire sidewall bulges, the third displacement value when the tire shoulder bulges, and the fourth displacement value when the tire bead bulges. The data processing steps include transmitting the first displacement value, the second displacement value, the third displacement value, and the fourth displacement value to the computer control system via an infrared explosion-proof industrial control computer, and the computer control system transmitting the data to the industrial control computer of the high-speed durability testing machine; The control steps include defaulting to a tire bulge and stopping the equipment if the displacement exceeds the set amount; The data acquisition step further includes: driving the high-speed durability testing machine roller with an AC motor to perform tests at an initial speed of 200 km / h; The data processing step further includes: filtering the acquired data using a low-pass elliptic filter, and then calculating the average value after filtering. L1 , with initial displacement L2 By subtracting the values, the displacement difference can be obtained. L3 And so on, if the displacement difference L3 If the value is equal to 1 mm, then record the time point at this moment. A1 Record data, when the displacement difference L3 Equal to 2 mm, record the time at this moment as A2 ,right A1 arrive A2 The displacement difference data within a time interval are subjected to a cubic polynomial fitting to derive the fitting curve formula, i.e. in, L Let t represent the displacement difference, t represent the test time, and a, b, c, and d be constant values ​​of the fitted data curve. Calculate t = A1 When, the slope K of polynomial L; The control steps further include: the test system collects data from each infrared laser rangefinder, and if K ≥ 0.01 mm / s of one of the data channels and L3 If the value is ≥2 mm, the data is transmitted to the computer control system via the infrared explosion-proof industrial control computer, and the system alarm device stops.

2. The tire bulge testing method according to claim 1, characterized in that, The data acquisition step further includes: the infrared laser rangefinder device has an acquisition frequency of 1024 Hz. After the tire is preheated for 30 minutes, the infrared laser rangefinder device acquires the average value of the displacement over 3 minutes after preheating as the initial displacement. After 3 minutes, the infrared laser rangefinder device continuously acquires data.

3. The tire bulge testing method according to claim 2, characterized in that, The infrared laser rangefinder device includes three tread infrared laser rangefinders on the left tread, the center of the tread, and the right tread; two shoulder infrared laser rangefinders on the right shoulder and the left shoulder; two sidewall infrared laser rangefinders on the right sidewall and the left sidewall; and two outer rim infrared laser rangefinders on the right outer rim and the left outer rim.

4. The tire bulge testing method according to claim 1, characterized in that, The computer control system adopts a control system based on the combination of Matlab and industrial computer. The algorithm is completed in Simulink of the upper computer Matlab, the industrial computer is responsible for the acquisition and output of real-time data, and the data of the lower computer is realized through OPC technology. The interface of the tire bulge test control system is designed using the GUI graphical interface in Matlab.

5. The tire bulge testing method according to claim 3, characterized in that, The infrared laser rangefinder device also includes a support frame, a sliding sleeve connected to the support frame, a telescopic rod connected to the sliding sleeve, and a dedicated rangefinder device.

6. The tire bulge testing method according to claim 5, characterized in that, The three tread laser rangefinders are designed according to the tire size and tread pattern. They are adjustable left and right in the sliding sleeve of the infrared laser rangefinder device, and the front and back distances are adjusted by the telescopic rod. They collect data on the distance between the tire tread blocks, avoiding the collection of the distance between the tread grooves. The tire bead rangefinder, tire shoulder rangefinder, and tire sidewall rangefinder are adjusted according to the tire size by the telescopic rod and the sliding sleeve. The positions of the rangefinders are then fine-tuned by the dedicated rangefinder device to accurately test the positions of the bead, tire shoulder, and tire sidewall.

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