A method and apparatus for stability testing of tire force and torque testing equipment

Abstract

This application relates to the field of vehicle safety technology, specifically to a method and apparatus for testing the stability of a tire force and torque testing device. The method includes selecting multiple qualified quality control tires; sequentially performing warm-up tire testing, side slip testing, longitudinal slip testing, tire pressure control testing, and steel belt offset testing on each quality control tire; monitoring the parameters of the tire force and torque testing device during the testing process; identifying multiple indicators based on the parameters and the magic formula; and using the Laida criterion, determining the stability of the tire force and torque testing device based on the multiple indicators. This application monitors the stability of the testing device by identifying parameters and combining them with the device's output data.

Description

Technical Field

[0001] This application relates to the field of equipment testing technology, and more specifically, to a stability testing method and apparatus for a tire force and torque testing device. Background Technology

[0002] With the continuous development of the automotive industry, vehicle handling stability has gradually become a key factor in enhancing the market competitiveness of automotive products. As the only component in contact with the road surface, tire lateral stiffness and longitudinal slip stiffness are important indicators affecting vehicle handling stability. Therefore, obtaining true and accurate tire handling stability data through tire force and torque tests is particularly important. Tire force and torque testing equipment is precise in control and provides timely feedback, making it the mainstream equipment for testing tire handling stability characteristics. However, this equipment system is large, has complex control logic, and many vulnerable parts. Wear on vulnerable parts or failure of a component during the test can affect the stability of the equipment, leading to distorted output results. Therefore, it is necessary to conduct stability tests on this equipment.

[0003] Existing technologies use direct tracing of raw data from each channel to verify equipment stability. However, this equipment involves numerous input control channels throughout the testing process, including tire pressure, rotational speed, steering angle, vertical load, and slip ratio. Therefore, existing methods are time-consuming, labor-intensive, and inefficient, with limitations. Furthermore, the complex equipment system makes troubleshooting difficult and time-consuming. The friction coefficient of the sandpaper decreases with the number of tests, and once the sandpaper wears to a certain extent, the test results will deviate. The large circumference of the steel-strapped sandpaper makes it difficult to detect excessive localized wear.

[0004] In view of the above, this application is hereby submitted. Summary of the Invention

[0005] The purpose of this application is to provide a stability testing method and apparatus for tire force and torque testing equipment, so as to monitor the stability of the testing equipment by identifying parameters and combining them with the equipment output data.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a stability testing method for a tire force and torque testing device, including:

[0008] Select multiple qualified quality-controlled tires;

[0009] Each quality control tire was subjected to a warm-up test, a side slip test, a longitudinal slip test, a tire pressure control test, and a steel belt offset test in sequence.

[0010] Monitor the parameters of the tire force and torque testing equipment during the testing process;

[0011] Based on the parameters and the magic formula, multiple indicators are identified;

[0012] Using the Raida criterion, the stability of the tire force and torque testing equipment is determined based on the aforementioned multiple indicators.

[0013] Based on the parameters and the magic formula, multiple indicators are identified, including: based on the parameters and the magic formula, the base value of the lateral peak friction coefficient, the tire trailing peak factor, the maximum lateral stiffness under nominal load, the maximum longitudinal stiffness under nominal load, the lateral friction coefficient, the longitudinal friction coefficient, the average tire pressure, and the maximum steel belt offset.

[0014] Optionally, the tire warm-up test includes:

[0015] The combination of the quality control tire and the corresponding rim is installed on the tire force and torque testing equipment, and the test tire pressure, load, speed, straight running time, side slip angle sweep frequency condition, side slip angle loading rate and number of cycles are set.

[0016] Perform a tire warm-up test according to the set parameters.

[0017] Optionally, the lateral deviation test includes:

[0018] Set the test tire pressure, load, speed, side slip angle sweep frequency condition, and side slip angle loading rate; cycle once according to the set parameters;

[0019] Apply loads at 80% and 120% of the nominal sidewall load of the quality control tire respectively, and perform side slip angle frequency sweep again.

[0020] Cooling the tire tread is performed between different load tests.

[0021] Optionally, the longitudinal slip test includes:

[0022] Set the test tire pressure, load, speed, slip ratio sweep frequency condition, slip ratio loading rate, and cycle once according to the set parameters;

[0023] Loads were applied at 80% and 120% of the nominal sidewall load of the quality control tires, respectively, and the slip ratio sweep frequency test was performed again.

[0024] Cooling the tire tread is performed between different load tests.

[0025] Optionally, the tire pressure control test includes:

[0026] Set the initial tire pressure, load, test speed, and tire pressure control time; run the test according to the set parameters.

[0027] Set different tire pressure values; continue running according to the set parameters.

[0028] Optionally, the steel strip offset test includes:

[0029] Set the initial tire pressure, load, speed, side slip angle sweep frequency condition, and side slip angle loading rate, and cycle 3 times according to the set parameters;

[0030] Reduce the speed and execute the side-slip angle frequency sweep mode, repeating 3 times.

[0031] Optionally, the stability of the tire force and torque testing equipment can be determined using the Raida criterion based on the multiple indicators, including:

[0032] Each indicator is dimensionless.

[0033] Calculate the standard deviation and mean of each indicator, and construct a reasonable range based on the standard deviation and mean;

[0034] The stability of the tire force and torque testing equipment is determined based on whether the indicators are within the corresponding reasonable range.

[0035] Optionally, after using the Raida criterion to determine whether the tire force and torque testing equipment is stable based on the multiple indicators, the method further includes:

[0036] Obtain abnormal indicators that are outside the reasonable range;

[0037] The components suspected of being faulty are identified based on the aforementioned abnormal indicators;

[0038] Inspect and repair any components suspected of being faulty.

[0039] Secondly, this application provides a stability testing device for tire force and torque testing equipment, comprising:

[0040] The selection module is used to select multiple qualified quality-controlled tires;

[0041] The testing module is used to sequentially perform warm-up tire condition test, side slip test, longitudinal slip test, tire pressure control test and steel belt offset test on each quality control tire;

[0042] The monitoring module is used to monitor the parameters of the tire force and torque testing equipment during the testing process;

[0043] The identification module is used to identify multiple indicators based on the parameters and the magic formula;

[0044] The judgment module is used to determine whether the tire force and torque testing equipment is stable based on the multiple indicators using the Raida criterion.

[0045] Based on the parameters and the magic formula, several indicators are identified, including:

[0046] Based on the parameters and the magic formula, the basic values ​​of the lateral peak friction coefficient, tire trailing peak factor, maximum lateral stiffness under nominal load, maximum longitudinal stiffness under nominal load, lateral friction coefficient, longitudinal friction coefficient, average tire pressure, and maximum steel belt offset are identified.

[0047] Compared with the prior art, the beneficial effects of this application are as follows:

[0048] This application provides a stability testing method and apparatus for a tire force and torque testing device. The method expresses the tire's operational stability based on the magic formula, and monitors the equipment parameters during the test to identify multiple indicators. By using the Raida criterion, the stability of the tire force and torque testing device is determined based on the multiple indicators. The method also identifies test result deviations caused by the equipment itself, enabling timely detection and location of problems, equipment repair, and ensuring that the output results are true and accurate. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0050] Figure 1 This is a flowchart of a stability testing method for a tire force and torque testing device provided in an embodiment of this application;

[0051] Figure 2 This is a structural diagram of a stability testing device for a tire force and torque testing equipment provided in an embodiment of this application. Detailed Implementation

[0052] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of this application, including various details to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0053] The present application will be further described in detail below with reference to the embodiments.

[0054] Figure 1This is a flowchart illustrating a stability testing method for a tire force and torque testing device according to an embodiment of this application. This method can be executed by a stability testing apparatus for the tire force and torque testing device, which can be composed of hardware and / or software and integrated into an electronic device. This method is applicable to scenarios involving stability determination / testing of tire force and torque testing equipment (hereinafter referred to as the equipment).

[0055] Tire force and torque testing equipment is a specialized device used to measure the mechanical properties of tires under various operating conditions, providing crucial data for vehicle design and performance optimization. For example, a flat belt testing machine simulates a road surface using a flat steel belt, and its main testing parameters include lateral force, self-aligning torque, and other six force components, as well as steady-state and dynamic tests.

[0056] In tire testing, stability is mainly reflected in two aspects: 1) Stability of test results (repeatability): This refers to the ability of the equipment to produce consistent and reliable data under the same test conditions. This is a key indicator for measuring equipment performance. 2) Stability of equipment operation: This refers to the ability of the equipment to maintain normal operation of its mechanical structure and control system during long-term, high-speed, or high-load testing, which is related to the efficiency and continuity of testing. This application creatively transforms the stability of quality control tire test indicators into the stability of the equipment. See below. Figure 1 The method provided in this embodiment will be described in detail.

[0057] S110. Select multiple qualified quality-controlled tires.

[0058] Quality control tires, also known as "quality-controlled tires," undergo comprehensive and repeated testing on high-precision benchmark equipment before being put into use. This process precisely measures a set of "standard" mechanical properties (such as lateral stiffness, longitudinal stiffness, peak adhesion under different operating conditions, and self-aligning torque characteristics). Quality control tires should be of acceptable quality and from the same production batch, preferably from leading brands. Each quality control tire can undergo five complete tests, including warm-up testing, lateral stiffness testing, longitudinal stiffness testing, tire pressure control testing, and steel belt misalignment testing. To prevent test deviations due to ambient temperature, tread debris, internal stress, etc., the quality control tires should be placed in the test environment 24 hours before the monitoring test. The results of the first test should not be used to determine the stability of the tire force and torque testing equipment. The interval between two tests on the same quality control tire should be greater than 3 hours.

[0059] In this embodiment, the quality control tire is used as a "benchmark" and any fluctuation in the test results directly reflects the stability, repeatability and accuracy of the equipment itself.

[0060] S120. Each quality control tire is subjected to a warm-up test, a side slip test, a longitudinal slip test, a tire pressure control test, and a steel belt offset test in sequence.

[0061] The warm-up tire test includes: mounting the quality control tire and its corresponding rim assembly onto the tire force and torque testing equipment; setting the test tire pressure, load, speed, straight-line running time, side slip angle sweep frequency condition, side slip angle loading rate, and number of cycles. In one specific embodiment, the test tire pressure is set to 250 kPa, a load of 80% of the nominal sidewall load (LI) of the quality control tire is applied, the speed is set to 60 km / h, and the straight-line running time is 5 minutes. Subsequently, a side slip angle sweep frequency movement is performed within ±1 degree, with a side slip angle loading rate of 0.2 degree / s, for a total of 3 cycles. The warm-up tire test is conducted according to the set parameters.

[0062] Side slip test includes: setting test tire pressure, load, speed, side slip angle sweep frequency condition, and side slip angle loading rate; cycling once according to the set parameters; applying loads at 80% and 120% of the nominal sidewall load of the quality control tire respectively, and performing side slip angle sweep frequency condition again; performing tread cooling operation between different load tests.

[0063] In one specific implementation, the test tire pressure is set to 250 kPa. A load of 40% of the nominal sidewall load (LI) of the quality control tire is applied at a speed of 60 km / h. The slip angle is swept in a frequency range of (-2~15~-15~2) degrees, with a slip angle loading rate of 2 degrees / s, and this cycle is repeated once. Then, loads of 80% and 120% of the nominal sidewall load (LI) of the quality control tire are applied, and the same slip angle frequency sweep is performed again. Between different load tests, the tire is run in a straight line at 60 km / h with a load of 500 N for 2 minutes to cool the tire tread.

[0064] The longitudinal slip test includes: setting the test tire pressure, load, speed, slip ratio sweep frequency condition, and slip ratio loading rate, and cycling once according to the set parameters. Applying loads at 80% and 120% of the nominal sidewall load of the quality control tire respectively, and performing the slip ratio sweep frequency condition again; cooling the tire tread is performed between different load tests.

[0065] In one specific implementation, the test tire pressure is set to 250 kPa. A load of 40% of the nominal sidewall load (LI) of the quality control tire is applied at a speed of 60 km / h. The slip ratio is swept using a frequency sweep pattern of (-3~30~-30~3)%, with a slip ratio loading rate of 10% / s, and the cycle is repeated once. Immediately afterwards, loads of 80% and 120% of the nominal sidewall load (LI) of the quality control tire are applied, and the same slip ratio frequency sweep is performed again. Between different load tests, the tire is run in a straight line at a speed of 60 km / h and a load of 500 N for 2 minutes to cool the tire tread.

[0066] Tire pressure control testing includes: setting the initial tire pressure, load, test speed, and tire pressure control time; running according to the set parameters; setting the tire pressure to different values; and continuing to run according to the set parameters.

[0067] In one specific embodiment, the initial tire pressure is set to 250 kPa, and a load is applied at 80% of the nominal sidewall load (LI) of the quality control tire. The test speed is 60 km / h, and the control time is 10 s. After the control time is reached, the tire pressure is then set to 150 kPa, 200 kPa, 250 kPa, 300 kPa, and 350 kPa, and a load is applied at 80% of the nominal sidewall load (LI) of the quality control tire. The test speed is 60 km / h, and the control time for each tire pressure is 10 s.

[0068] The steel belt offset test includes: setting the initial tire pressure, load, speed, side slip angle frequency sweep condition, and side slip angle loading rate, and cycling 3 times according to the set parameters; reducing the speed and performing the side slip angle frequency sweep condition, and cycling 3 times.

[0069] In one specific embodiment, the initial tire pressure is set to 250 kPa. A load is applied at 80% of the nominal sidewall load (LI) of the quality control tire. The test speed is 120 km / h, and the slip angle is swept in a frequency range of (0~10~-10~0) degrees with a slip angle loading rate of 10 degrees / s, repeated 3 times. Afterward, the speed is reduced to 10 km / h, and the slip angle is swept in a frequency range of (0~10~-10~0) degrees with a slip angle loading rate of 10 degrees / s, repeated 3 times.

[0070] To ensure consistency in testing, each stability test should be conducted in the following order: 1) warm-up tire condition, 2) side slip test, 3) warm-up tire condition, 4) longitudinal slip test, 5) tire pressure control test, and 6) steel belt offset test.

[0071] S130. Monitor the parameters of the tire force and torque testing equipment during the test.

[0072] Before identifying the parameters of the tire magic formula, it is necessary to collect the input variables and output responses completely and systematically on the tire force and torque testing equipment in order to ensure the reliability of the parameter identification results.

[0073] The parameters that need to be monitored include, but are not limited to, lateral slip angle, camber angle, vertical load, slip ratio, lateral force, self-aligning torque, longitudinal force, tire pressure, and belt offset.

[0074] S140. Based on the parameters and the magic formula, multiple indicators are identified.

[0075] The Magic Formula parameter identification is performed by determining the parameters of the Magic Formula based on the tire's six-component force test data and the MF model (Tire Magic Formula Model). This step, based on the parameters monitored in S130 and the Magic Formula, identifies the lateral peak friction coefficient P. dy1 The base value of the tire trailing peak factor q dz1 Maximum lateral stiffness P under nominal load ky1 Maximum lateral stiffness P under nominal load ky1 Lateral friction coefficient μ y Longitudinal friction coefficient μ x Average tire pressure Pt and maximum steel belt offset Y b .

[0076] Specifically, the peak lateral friction coefficient P was identified in the aforementioned lateral slip test. dy1 The base value of the tire trailing peak factor q dz1 Maximum lateral stiffness P under nominal load ky1 and the lateral friction coefficient μ y Based on the following magic formula, the monitored parameters are fitted using the least squares method.

[0077] The formula for lateral force is as follows:

[0078] ;

[0079] in, It is a lateral force. The lateral peak value coefficient. For lateral stiffness factor, It is the lateral slip angle. The lateral curvature factor, This represents the vertical drift value. The coefficient of lateral friction is... For vertical loads, The lateral peak friction coefficient is the vertical force F under nominal load. z The lateral friction coefficient, It is the variable that varies with the load in terms of the lateral friction coefficient. Let r be the lateral friction coefficient as a function of the roll angle, and r be the outward roll angle. dfz is the normalized vertical load increment.

[0080] The formula for the corrective torque is as follows:

[0081] ;

[0082] in, It is the restoring torque. It is a lateral force. It is the residual restoring torque, and t is the lever arm of the lateral force of the tire. It is the peak factor of tire trail. It is the stiffness coefficient. It is the curvature coefficient. It is the equivalent sideslip angle. It is the sideslip angle correction term. This is the baseline value for the tire drag peak factor, i.e., the baseline value for the tire drag peak factor when the load change is 0. It is a variable that varies with load, representing the peak tire drag factor. It is a variable that varies with the camber angle, representing the peak drag factor of the tire. It is the peak drag factor of the tire as a function of the camber angle. Variables that change squarely It is the tire's free radius. This is the nominal load.

[0083] In this embodiment, the parameters that need to be identified through the formulas for the aligning torque and the lateral force include: the peak lateral friction coefficient P. dy1 The base value of the tire trailing peak factor q dz1 .

[0084] The formula for lateral stiffness is as follows:

[0085] ;

[0086] in, It is the lateral stiffness. It is the maximum lateral stiffness under nominal load. For reference vertical load, For vertical loads, This represents the peak lateral stiffness load factor.

[0087] In this embodiment, the parameters that need to be identified by the lateral stiffness formula include: the maximum lateral stiffness P under nominal load. ky1 .

[0088] Lateral friction coefficient μ y It can be obtained directly from the monitoring parameters (LI and the maximum lateral force under LI load in the lateral load condition) in the lateral test:

[0089] μ y =(Maximum lateral force under lateral deflection condition with 80%×LI load) / (80%×LI);

[0090] Where LI is the nominal load on the tire sidewall.

[0091] In the aforementioned longitudinal slip test, the longitudinal friction coefficient μx and the maximum longitudinal slip stiffness under nominal load were identified based on the least squares method. The formula for longitudinal slip stiffness is as follows:

[0092] ;

[0093] in, It is a vertical force. It is the maximum longitudinal slip stiffness under nominal load. It is the variable representing the longitudinal slip stiffness as a function of load, and dfz is the normalized vertical load increment. It is an exponential variable of longitudinal slip stiffness with respect to load. It is the proportionality factor of longitudinal slip stiffness. This refers to the longitudinal slip stiffness. The maximum longitudinal slip stiffness under nominal load is identified using the longitudinal slip stiffness formula. .

[0094] It should be noted that, in addition to the least squares method, extended Kalman filtering, particle swarm optimization, and genetic algorithms can also be used for parameter identification.

[0095] Longitudinal friction coefficient μ x It can be directly obtained from the monitoring parameters (LI and the maximum lateral force under the lateral slip condition) in the aforementioned longitudinal slip test:

[0096] μ x =(Maximum longitudinal force under longitudinal sliding condition with 80%×LI load) / (80%×LI)

[0097] Tire pressure values ​​can be obtained directly from monitoring equipment. Take the actual tire pressure value of the last 5 seconds of each tire pressure control time during the tire pressure control test, and calculate the average value. The average value should not exceed ±3 kPa of the specified tire pressure.

[0098] PT control -3kPa≤PT≤PT control +3kPa;

[0099] Among them, PT control It specifies the tire pressure, and PT is the average tire pressure.

[0100] The maximum offset of the steel strip can be obtained directly from the monitoring equipment. Take the maximum offset value Yb of the steel strip during the steel strip offset test.

[0101] S150. Using the Raida criterion, determine whether the tire force and torque testing equipment is stable based on the multiple indicators.

[0102] It should be noted that the above indicators include: peak lateral friction coefficient, baseline value of tire trailing factor, maximum lateral stiffness under nominal load, maximum longitudinal stiffness under nominal load, weighted sum of calculated values ​​of lateral and longitudinal friction coefficients, average tire pressure, and maximum steel belt offset. The weighted sum of the lateral and longitudinal friction coefficients is, for example, 0.7 × μ. y +0.3×μx .

[0103] First, each indicator is dimensionless, and then the standard deviation of each indicator is calculated. and average .

[0104] For ease of description, the i-th indicator will be represented by X in this step. i To represent this, we have the following formula:

[0105] ;

[0106] ;

[0107] in, Y is the average of all i-th indicators obtained based on multiple quality control tires. i It is the dimensionless value of the i-th indicator. N is the number of quality control tires tested. It is the average value of the i-th indicator after dimensionless measurement.

[0108] Construct a reasonable range based on the standard deviation and mean. Taking the normal distribution as an example, most data fall within this range. Within that range, therefore it can be combined as well as To determine whether the test results deviate from the overall test results.

[0109] The stability of the tire force and torque testing equipment is determined based on whether the indicators are within the corresponding reasonable range. The specific rules are as follows:

[0110] (1) Any indicator in The equipment was determined to be stable.

[0111] (2) Any indicator in and The device was deemed acceptable.

[0112] (3) or The device is determined to be unstable or malfunctioning.

[0113] Optionally, abnormal indicators that are outside the reasonable range are obtained; suspected faulty components are identified based on the abnormal indicators; and suspected faulty components are investigated and repaired.

[0114] Specifically, through P dy1 q dz1 P ky1 This system can comprehensively assess equipment load and angle control status. If an abnormality is detected, it is necessary to check whether the equipment sensors and hydraulic actuators are malfunctioning. (This is achieved through P...) kx1The system can determine the slip ratio control status; if an abnormality is detected, the drive motor control cabinet and actuator should be checked for malfunctions. The wear of the sandpaper is comprehensively assessed by calculating the weighted sum of the lateral and longitudinal friction coefficients; if an abnormality is detected, the sandpaper should be replaced. The stability of the equipment's air pressure control is determined by the average tire pressure; if an abnormality is detected, the desiccant and air filter should be replaced, and the servo valve should be checked for damage. The stability of the steel belt operation is determined by the maximum steel belt offset; if an abnormality is detected, the scraper blades should be checked for severe wear, the steel belt drum and camera should be cleaned, and the steel belt itself should be checked for damage.

[0115] This application provides a stability testing method and apparatus for a tire force and torque testing device. The method expresses the tire's operational stability based on the magic formula, and monitors the equipment parameters during the test to identify multiple indicators. By using the Raida criterion, the stability of the tire force and torque testing device is determined based on the multiple indicators. The method also identifies test result deviations caused by the equipment itself, enabling timely detection and location of problems, equipment repair, and ensuring that the output results are true and accurate.

[0116] This application also provides a stability testing device for tire force and torque testing equipment, see [link]. Figure 2 The device includes:

[0117] The selection module is used to select multiple qualified quality-controlled tires;

[0118] The testing module is used to sequentially perform warm-up tire condition test, side slip test, longitudinal slip test, tire pressure control test and steel belt offset test on each quality control tire;

[0119] The monitoring module is used to monitor the parameters of the tire force and torque testing equipment during the testing process;

[0120] The identification module is used to identify multiple indicators based on the parameters and the magic formula;

[0121] The judgment module is used to determine whether the tire force and torque testing equipment is stable based on the Laida criterion and the multiple indicators.

[0122] This device can perform the methods provided in the above embodiments and has the corresponding technical effects, which will not be described in detail here.

[0123] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired means, such as coaxial cable, optical fiber, digital subscriber line (DSL), or wireless means, such as infrared, wireless, microwave, etc. The computer-readable storage medium can be any available medium that a computer can access, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium, or a semiconductor medium, etc. It is worth noting that the computer-readable storage medium mentioned in the embodiments of this application can be a non-volatile storage medium, in other words, it can be a non-transient storage medium.

[0124] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0125] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A stability test method for a tire force and moment test apparatus, characterized by, The method comprises the following steps: selecting a plurality of qualified quality control tires; performing, in sequence, a warm-up tire test, a cornering test, a longitudinal slip test, a tire pressure control test, and a steel belt shift test on each of the quality control tires; monitoring parameters of a tire force and torque testing device during the tests; identifying a plurality of indexes based on the parameters and a magic formula; using the Relyada criterion to determine whether the tire force and torque testing device is stable according to the plurality of indexes; wherein identifying the plurality of indexes based on the parameters and the magic formula comprises identifying a lateral peak friction coefficient, a tire drag distance peak factor basic value, a maximum cornering stiffness under a nominal load, a maximum longitudinal slip stiffness under the nominal load, a lateral friction coefficient, a longitudinal friction coefficient, a tire pressure average value, and a maximum steel belt shift amount based on the parameters and the magic formula.

2. The stability test method of the tire force and moment test apparatus according to claim 1, characterized by, The warm-up tire test comprises the following steps: installing a combination of a quality control tire and a corresponding rim on the tire force and torque testing device, setting a test tire pressure, a load, a speed, a straight running time, a cornering angle sweep condition, a cornering angle loading rate, and a cycle number; performing the warm-up tire test according to the set parameters.

3. The stability test method of the tire force and moment test apparatus according to claim 1, characterized by, The cornering test comprises the following steps: setting a test tire pressure, a load, a speed, a cornering angle sweep condition, and a cornering angle loading rate, and cycling once according to the set parameters; applying a load of 80% and 120% of a tire side nominal load of the quality control tire, respectively, and performing a cornering angle sweep condition again; performing a cooling tire surface operation between different load tests.

4. The stability test method of the tire force and moment test apparatus according to claim 1, characterized by, The longitudinal slip test comprises the following steps: setting a test tire pressure, a load, a speed, a slip ratio sweep condition, a slip ratio loading rate, and cycling once according to the set parameters; applying a load of 80% and 120% of a tire side nominal load of the quality control tire, respectively, and performing a slip ratio sweep condition again; performing a cooling tire surface operation between different load tests.

5. The stability test method of the tire force and moment test apparatus according to claim 1, characterized by, The tire pressure control test comprises the following steps: setting an initial tire pressure, a load, a test speed, and a tire pressure control time, and running according to the set parameters; setting different values of a tire pressure, and continuing to run according to the set parameters.

6. The stability test method of the tire force and moment test apparatus according to claim 1, characterized by, The steel belt shift test comprises the following steps: setting an initial tire pressure, a load, a speed, a cornering angle sweep condition, a cornering angle loading rate, and cycling three times according to the set parameters; reducing the speed, performing a cornering angle sweep condition, and cycling three times.

7. The stability test method of the tire force and moment test apparatus according to claim 1, characterized by, Using the Relyada criterion to determine whether the tire force and torque testing device is stable according to the plurality of indexes comprises the following steps: dimensionless processing each index; calculating a standard deviation and an average value of each index, and constructing a reasonable range based on the standard deviation and the average value; determining whether the tire force and torque testing device is stable according to whether the index is within the corresponding reasonable range.

8. The stability testing method of the tire force and moment testing apparatus according to claim 7, characterized by, After using the Relyada criterion to determine whether the tire force and torque testing device is stable according to the plurality of indexes, the method further comprises the following steps: obtaining an abnormal index that is not within the reasonable range; determining a suspected faulty element according to the abnormal index; investigating and repairing the suspected faulty element.

9. A stability testing apparatus for a tire force and moment testing apparatus, characterized by, The method comprises the following steps: a selecting module for selecting a plurality of qualified quality control tires; a testing module for performing, in sequence, a warm-up tire test, a cornering test, a longitudinal slip test, a tire pressure control test, and a steel belt shift test on each of the quality control tires; The monitoring module is configured to monitor parameters of the tire force and moment testing device during the test; The identification module is configured to identify a plurality of indexes based on the parameters and the magic formula; The judgment module is configured to determine whether the tire force and moment testing device is stable according to the plurality of indexes using the Routh criterion. The identification of the plurality of indexes based on the parameters and the magic formula includes identification of a lateral peak friction coefficient, a basic value of a tire drag distance peak value factor, a maximum cornering stiffness at a nominal load, a maximum longitudinal slip stiffness at the nominal load, a lateral friction coefficient, a longitudinal friction coefficient, an average tire pressure value, and a maximum steel belt deflection based on the parameters and the magic formula.

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