A reliability test method and system for a vehicle b-pillar

Abstract

The application provides a reliability test method and system for a B column of an automobile, and relates to the technical field of reliability testing.The method provided by the application comprises the following steps: performing an aging test on a to-be-tested B column under a set environment test condition to obtain an aged B column; performing a simulation collision test on the aged B column; and determining the reliability of the to-be-tested B column after use according to the outer surface damage condition of the aged B column after the simulation collision test.The application performs the reliability test on the B column after use, and makes up for the defects of the lack of a test scheme for the B column in use in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reliability testing, in particular to a reliability testing method and system for a B-pillar of an automobile. BACKGROUND

[0002] With the development of society, the number of automobile safety accidents has increased dramatically. How to improve the safety performance of vehicles during the research and design stage is the research focus of all vehicle manufacturers. In particular, during the middle and later stages of the vehicle's service life, good safety performance should be maintained.

[0003] At present, in order to improve the safety performance of the whole vehicle, all vehicle manufacturers are focusing on developing and using new materials. The current hot material, carbon fiber composite material, has been used to replace part or the whole of the B-pillar by means of bonding, riveting and other connection methods, in order to improve lightweight or strength. In the prior art, there is no reliability testing method for this new type of B-pillar. Moreover, most of the prior art uses a new B-pillar for testing, and the test results can only represent the performance of the new part under the test condition, without considering the influence of defects caused by the connection method or the composite material itself during use. Therefore, the present application is proposed. SUMMARY

[0004] In view of the above problems, the present application provides a reliability testing method and system for a B-pillar of an automobile, which is used to test the reliability of a B-pillar after a period of use.

[0005] In a first aspect, the embodiments of the present application provide a reliability testing method for a B-pillar of an automobile, comprising:

[0006] performing an aging test on a B-pillar to be tested under a set environmental test condition to obtain an aged B-pillar;

[0007] performing a simulated collision test on the aged B-pillar;

[0008] determining the reliability of the B-pillar to be tested after use according to the external damage of the aged B-pillar after the simulated collision test.

[0009] In a second aspect, the embodiments of the present application provide a reliability testing system for a B-pillar of an automobile, comprising:

[0010] The environmental simulation device is used to simulate a set environmental test condition;

[0011] The high-speed impact trolley is used to collide with the aged B-pillar;

[0012] The controller is configured to control the environmental simulation device to simulate a set environmental test condition, control the high-speed impact trolley to perform a simulated collision test on the aged B-pillar, and determine the reliability of the B-pillar after use according to the external damage of the aged B-pillar after the simulated collision test.

[0013] Compared with the prior art, the scheme provided in the application has the following technical effects:

[0014] 1. The application realizes the collision reliability test of the B-pillar with certain use traces by performing the simulated collision test after the environmental aging test of the B-pillar, which makes up for the defects of the lack of test scheme of the B-pillar in use in the prior art.

[0015] 2. The application can be applied to the B-pillar test of the composite material, accelerates the simulation of different use years and different use conditions of the composite B-pillar under the set environmental test condition, considers the defect influence of the composite material itself due to corrosion aging and the like in the use cycle, and realizes the test of the safety performance of the composite B-pillar after use for a period of time.

[0016] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the content of the specification can be implemented, and in order to make the above description and other purposes, characteristics and advantages of the application more obvious and easy to understand, the preferred embodiments are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several drawings to designate the same or similar parts. In the drawings:

[0018] Figure 1 A flowchart of a reliability test method of an automobile B-pillar provided by the embodiments of the application;

[0019] Figure 2 A structural schematic diagram of a reliability test system of an automobile B-pillar provided by the embodiments of the application. DETAILED DESCRIPTION

[0020] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thoroughly and completely understood, and will fully convey the scope of the present disclosure to those skilled in the art.

[0021] In the description of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like should be interpreted broadly, for example, can be connected, or can be detachable, or can be integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] The embodiment of the present application provides a reliability test method of a B column of a vehicle, which is suitable for the case of performing reliability test on the B column of the vehicle after simulating use. The method provided by the embodiment comprises the following steps:

[0023] S110, performing an aging test on the to-be-tested B column under a set environment test condition to obtain an aged B column.

[0024] The set environment test condition is used to simulate the environment of the B column in the real environment. Optionally, the set environment test condition comprises at least one of a salt spray environment test condition, a vibration environment test condition, a temperature environment test condition and a humidity environment test condition. The parameters in each environment test condition can be adjusted to simulate different degrees of harshness of the environment. The cycle period of each environment test condition is at least one. By setting the parameters and the cycle period, different use conditions and use time lengths can be simulated.

[0025] When performing the aging test on the to-be-tested B column, each environment test condition can be applied to the to-be-tested B column one by one, or two or more environment test conditions can be applied to the to-be-tested B column together, and the application order of the environment test conditions is not limited.

[0026] Optionally, the to-be-tested B column in the embodiment is a brand new B column, and after the aging test, a B column used for a period of time (i.e., having use traces) is obtained, which is called an aged B column.

[0027] Optionally, the B-pillar to be tested in the embodiment is a composite B-pillar, for example, a carbon fiber composite material is connected to the B-pillar as a part of the B-pillar through bonding, riveting or other connection methods. During the aging test, the composite B-pillar will be corroded to a certain extent under the action of the environment. The aging test is used in the embodiment to simulate the influence of environmental factors on the composite B-pillar.

[0028] In some embodiments, considering that some B-pillars are severely affected after the aging test, it is not necessary to perform a simulated collision test. Based on this, during the aging test, the surface corrosion and composite material connection of the aging B-pillar are determined; if the surface corrosion and composite material connection meet the collision requirements, the operation of performing a simulated collision test on the aging B-pillar is executed; if the surface corrosion and composite material connection do not meet the collision requirements, it is considered that the B-pillar to be tested does not have reliability, and the simulated collision test can not be performed.

[0029] For example, the image of the aging B-pillar after the aging test is captured by a high-speed camera. The image recognition model is used to identify the surface corrosion (such as rusting, falling off) part and the connection part. The maximum corrosion area that meets the collision requirements and the minimum area ratio of the cross-sectional area of the connection part to the cross-sectional area of the new B-pillar are preset. If the identified corrosion area is less than or equal to the maximum corrosion area, and the cross-sectional area of the connection part accounts for an area ratio of the cross-sectional area of the new B-pillar that is greater than or equal to the minimum area ratio, the collision requirements are met, and S120 is continued to be executed; otherwise, the collision requirements are not met. The image recognition model needs to be pre-trained using training samples, and the training samples include B-pillar images marked with corrosion parts and connection parts. The image recognition model is trained using the training samples to have the ability to identify corrosion parts and connection parts.

[0030] It should be noted that the identification of the surface corrosion and the composite material connection is not limited to the image recognition model, but can also be identified by the human eye; or point-shaped markers or strip-shaped markers are pasted on the surface of the B-pillar, and the surface corrosion and the composite material connection are determined by whether the point-shaped markers or the strip-shaped markers exist after the aging test or whether they are displaced.

[0031] S120, performing a simulated collision test on the aging B-pillar.

[0032] The aging B-pillar is installed on a vibration table, a test platform or a sample vehicle. A high-speed impact trolley is controlled to drive towards the aging B-pillar at a set speed to collide with the aging B-pillar and perform a simulated collision test. The collision speed and the collision angle can be adjusted to simulate different collision scenarios.

[0033] S130, determining the reliability of the B-pillar to be tested after use according to the surface damage of the aging B-pillar after the simulated collision test.

[0034] After the simulation of the collision test, the bending and damage of the outer surface of the aged B-pillar compared to the brand-new state is observed. Alternatively, after the simulation of the collision test, the bending state, damage degree, and connection integrity of the aged B-pillar are determined; if the bending state, damage degree, and connection integrity meet the preset test standard, it is determined that the B-pillar to be tested has reliability after use.

[0035] The bending state refers to the bending angle and bending direction of the aged B-pillar compared to the brand-new state. The test standard of the preset bending state can include the allowed bending direction and the maximum bending angle. If the aged B-pillar after the collision meets the allowed bending direction, and the bending angle is less than or equal to the maximum bending angle, the bending state meets the preset test standard, otherwise the bending state does not meet the preset test standard.

[0036] The damage degree refers to the degree of surface loss and cracking of the aged B-pillar compared to the brand-new state. The test standard of the preset damage degree can include the maximum damage area and the maximum damage depth. If the damage area of the aged B-pillar after the collision is less than or equal to the maximum damage area, and the damage depth is less than or equal to the maximum damage depth, the damage degree meets the preset test standard, otherwise the damage degree does not meet the preset test standard.

[0037] The connection integrity refers to the connection degree of the aged B-pillar compared to the brand-new state, including complete connection, partial fracture, and complete fracture. The test standard of the preset connection integrity can include the minimum area ratio of the cross-sectional area of the connected part to the cross-sectional area of the brand-new B-pillar. If the cross-sectional area of the connected part of the aged B-pillar after the collision accounts for an area ratio of the cross-sectional area of the brand-new B-pillar greater than or equal to the minimum area ratio, the connection integrity meets the preset test standard, otherwise the connection integrity does not meet the preset test standard.

[0038] If the bending state, damage degree, and connection integrity all meet the preset test standard, it is determined that the B-pillar to be tested has reliability after use. If the bending state, damage degree, or connection integrity does not meet the preset test standard, it is determined that the B-pillar to be tested does not have reliability after use. It should be noted that the present embodiment lists three reliability indicators after collision: bending state, damage degree, and connection integrity. Other reliability indicators can also be added according to actual needs.

[0039] In some embodiments, the image of the aged B-pillar after the simulated collision test is collected by a high-speed camera, and the image of the aged B-pillar is subjected to image recognition to obtain the outer folding damage condition; and the reliability of the to-be-tested B-pillar after use is determined according to the outer folding damage condition. For example, an image recognition model is used to identify the folding direction, folding angle, connection part, damage area and damage depth of the aged B-pillar. Different image recognition models can be used to identify the foregoing indicators respectively, or one image recognition model can be used for multi-task identification. The image recognition model also needs to be pre-trained using training samples, and the training samples include B-pillar images marked with folding direction, folding angle, connection part, damage area and damage depth. The training samples are used to train the image recognition model so that it has the identification capability of folding direction, folding angle, connection part, damage area and damage depth.

[0040] It should be noted that the identification of the folding state, damage degree and connection integrity is not limited to the image recognition model, but can also be identified by the human eye; or point-shaped markers or strip-shaped markers are pasted on the surface of the B-pillar, and after the aging test, whether the point-shaped markers or strip-shaped markers exist or are shifted to determine the outer corrosion condition and the composite connection condition.

[0041] Compared with the prior art, the scheme provided by the present application has the following technical effects:

[0042] 1. The present application realizes the collision reliability test of the B-pillar with certain use traces by performing an environmental aging test on the to-be-tested B-pillar and then performing a simulated collision test, thereby making up for the defects of the lack of test schemes for B-pillars in use in the prior art.

[0043] 2. The present application can be applied to the test of composite material B-pillars, accelerates the simulation of different service life and different service conditions of composite material B-pillars under the set environmental test conditions, considers the defect influence of the composite material itself due to corrosion aging and the like in the service period, and realizes the test of the safety performance of the composite material B-pillar after being used for a period of time.

[0044] The present application also provides a specific reliability test method for an automobile B-pillar, and provides detailed environmental test conditions and parameters of the collision test.

[0045] Optionally, the to-be-tested B-pillar is subjected to an aging test under salt spray environmental test conditions, temperature environmental test conditions and humidity environmental test conditions, and the test conditions are specifically shown in the following table. Different environmental parameters are used in each stage, and 3 stages constitute one test cycle period, and a total of 42 cycle periods are executed.

[0046] Table 1 Environmental parameter table

[0047]

[0048] Optionally, the B-pillar to be tested is subjected to an aging test under sinusoidal vibration or random vibration conditions. Specifically, the B-pillar to be tested is fixed on a vibration table, and the vibration table is controlled to vibrate, thereby driving the B-pillar to vibrate. The parameters of the sinusoidal vibration are shown in Table 2, and the parameters of the random vibration are shown in Table 3.

[0049] Table 2 Sinusoidal vibration parameters

[0050]

[0051] In Table 2, the time per axis is the time of sinusoidal vibration of the vibration table around its X-axis, Y-axis or Z-axis, and is in hours (h).

[0052] Table 3 Random vibration parameters

[0053]

[0054] In Table 3, R.M.S (rms: root mean square) is the effective value of the random vibration test, which describes the degree of concentration of random variables (acceleration, etc.) around the average value.

[0055] Optionally, while the B-pillar to be tested is subjected to an aging test under sinusoidal vibration or random vibration conditions, the environmental temperature varying with time can also be set to simulate the working conditions of the B-pillar under vibration at different environmental temperatures. The environmental temperature values are shown in Table 4.

[0056] Table 4 Environmental temperature

[0057]

[0058] When the test time reaches 500 minutes (min), the test is reset and the time is started from 0 again, so that the test is cycled according to the temperature values in Table 4.

[0059] Optionally, the B-pillar to be tested is subjected to 10 cycles of cyclic salt spray test and sinusoidal vibration test (with environmental temperature), and then subjected to 32 cycles of cyclic salt spray test and random vibration test (with environmental temperature). After the aging test is completed, the B-pillar is placed at room temperature for 48 hours before the simulated impact test is started. Optionally, the aged B-pillar is subjected to a simulated impact test under simulated impact conditions. The simulated impact conditions include: impact speed of 50 km / h; impact angle of 90 degrees; and high-speed impact trolley weight of 1200 kg.

[0060] The embodiment of the present application also provides a reliability test method of a B column of an automobile, which is used for the case of comparative reliability test of at least two B columns to be tested. The at least two B columns to be tested can be B columns with unknown reliability, so as to determine the influence of different environmental test conditions on the reliability of the B columns; or can include a B column with reliability, so as to determine the reliability of the B column to be tested intuitively and quickly by comparing the surface damage.

[0061] For example, for each B column to be tested, an aging test is performed under different set environmental test conditions, and at least two aged B columns are obtained. In a first case, for each B column to be tested, an aging test is performed under different cycle periods of environmental test conditions, and at least two aged B columns are obtained. The environmental test conditions are the same, but the cycle periods are different, so as to simulate the same working condition but different service life. For example, Tables 1 and 2 are used to simulate the actual state of the B column after 8-10 years of use. If it is necessary to simulate the state after 13-15 years of use, the total cycle period of the cycle salt spray is lengthened by 18 cycles on the basis of Table 1, and the vibration acceleration of Table 2 is increased by 1.5 times. In a second case, for each B column to be tested, an aging test is performed under different kinds of environmental test conditions, and at least two aged B columns are obtained. The environmental test conditions are different, but the cycle periods are the same, so as to simulate the same service life but different working conditions. In a third case, for each B column to be tested, an aging test is performed under different kinds of environmental test conditions and different cycle periods. The environmental test conditions are different, and the cycle periods are also different, so as to simulate different working conditions and different service life.

[0062] For each aged B column, a simulated collision test is performed. After the simulated collision test, the surface damage of different aged B columns is compared, and the reliability of different B columns to be tested under different use conditions is determined. The embodiment mainly determines the reliability comparison result of different B columns to be tested by comparing the surface damage of different aged B columns. For example, if the bending angle of the B column to be tested 1 is greater than that of the B column to be tested 2, the reliability of the B column to be tested 1 is lower than that of the B column to be tested 2.

[0063] In combination with the above embodiments, the embodiment of the present application can understand the reliability of the composite B column under different service life and different working conditions by applying different degrees of environmental test conditions to the B column to be tested. On the basis of determining the reliability, the composite B column with different service life, strength and working condition can be designed, which is beneficial for the vehicle enterprise to plan the material for different levels of vehicle models. Compared with the traditional test scheme, the embodiment of the present application considers more comprehensive influencing factors, and effectively reduces the test time and cost under the same conditions.

[0064] The embodiment of the present application also provides a reliability test system of a B column of an automobile, which is used for the case of comparative reliability test of at least two B columns to be tested. The at least two B columns to be tested can be B columns with unknown reliability, so as to determine the influence of different environmental test conditions on the reliability of the B columns; or can include a B column with reliability, so as to determine the reliability of the B column to be tested intuitively and quickly by comparing the surface damage. Figure 2The system comprises an environment simulation device, a high-speed impact trolley and a controller.

[0065] The environment simulation device is used to simulate a set environment test condition.

[0066] The high-speed impact trolley is used to collide with the aging B-pillar.

[0067] The controller is used to control the environment simulation device to simulate a set environment test condition, and perform an aging test on the B-pillar to be tested under the set environment test condition to obtain an aging B-pillar; the controller is also used to control the high-speed impact trolley to perform a simulated collision test on the aging B-pillar; and the controller is further used to determine the reliability of the B-pillar to be tested after use according to the external damage condition of the aging B-pillar after the simulated collision test. Further, the controller is used to execute the reliability test method of the B-pillar of the automobile provided in any one of the above embodiments. Optionally, the controller is located in a control room.

[0068] Optionally, the reliability test system of the B-pillar of the automobile further comprises a high-speed camera, which is used to capture images of the aging B-pillar after the aging test and images of the aging B-pillar after the simulated collision test. The captured images are transmitted to the controller. The controller performs image recognition to determine the state of the B-pillar. Optionally, the number of high-speed cameras is multiple, and the high-speed cameras are directed towards different positions of the B-pillar to be tested, so as to capture multi-angle images of the B-pillar to be tested, and further successfully determine the multi-angle external damage condition, corrosion condition and composite material connection condition of the B-pillar to be tested.

[0069] In a specific embodiment, referring to Figure 2 The environment simulation device and the controller are located in a closed space (which can be referred to as an environment room), and the front wall of the closed space is liftable to facilitate the collision between the high-speed impact trolley and the B-pillar to be tested. The wall of the closed space can be made of transparent material to facilitate the recording of the high-speed camera; or the high-speed camera can be directly arranged in the closed space to monitor the state change of the B-pillar to be tested during the aging test and the simulated collision test.

[0070] The B-pillar to be tested is fixed on the vibration table by a fixing tool, so that the B-pillar to be tested is simultaneously subjected to vibration (applied by the vibration table), an environment temperature (the temperature and humidity of the closed space are adjusted by the temperature regulator and the humidity regulator) and a salt spray environment (the salt spray environment is realized by spraying salt water through the salt spray nozzle above the B-pillar to be tested). Alternatively, various environment test conditions can be applied in sequence according to a predetermined procedure. The driving route of the high-speed impact trolley can directly reach the vibration table, and there is a sufficient acceleration section. The height of the head tool of the high-speed impact trolley is adjustable. Before the simulated collision test, the height of the head tool is adjusted to a position flush with the collision point of the B-pillar to be tested, so as to facilitate the collision test.

[0071] The reliability test system of the automobile B column provided by the embodiment provides a four-combined vibration table with temperature regulation, humidity regulation, salt spray regulation and high-speed collision function, and does not need to switch places and equipment in different environmental condition implementation stages, and even does not need to replace the tooling, thereby saving manpower and financial resources.

[0072] The above merely provides the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A reliability testing method of a B-pillar of a vehicle, the method comprising: performing an aging test on a B-pillar to be tested under a set environmental testing condition to obtain an aged B-pillar; performing a simulated crash test on the aged B-pillar; and determining a reliability of the B-pillar to be tested after use according to an outer surface damage condition of the aged B-pillar after the simulated crash test, the determining comprising: determining a bending state, a damage degree, and a connection integrity of the aged B-pillar after the simulated crash test; and determining that the B-pillar to be tested has the reliability after use if the bending state, the damage degree, and the connection integrity satisfy a preset testing standard, wherein the testing standard of the connection integrity comprises a minimum cross-sectional area ratio of a connection portion to a cross-sectional area of a brand-new B-pillar.

2. The method of claim 1, wherein the set environmental testing condition comprises at least one of a salt spray environmental testing condition, a vibration environmental testing condition, a temperature environmental testing condition, and a humidity environmental testing condition.

3. The method of claim 1, wherein a cycle period of each of the environmental testing conditions is at least one.

4. The method of claim 1, further comprising: determining an outer surface corrosion condition and a composite material connection condition of the aged B-pillar during the aging test; and performing the simulated crash test on the aged B-pillar if the outer surface corrosion condition and the composite material connection condition satisfy a crash requirement.

5. The method of claim 1, wherein a number of the B-pillars to be tested is at least two.

6. The method of claim 1, wherein the performing the aging test on the B-pillar to be tested comprises: performing the aging test on each of the B-pillars to be tested under different set environmental testing conditions to obtain at least two aged B-pillars.

2. The method of claim 1, wherein, 7. The method of claim 1, wherein the determining the reliability of the B-pillar to be tested after use comprises: comparing the outer surface damage condition of the aged B-pillars after the simulated crash test to determine the reliability of the different B-pillars to be tested under different use conditions.

8. The method of claim 1, wherein the performing the aging test on each of the B-pillars to be tested under different set environmental testing conditions comprises: performing the aging test on each of the B-pillars to be tested under different cycle periods and / or different types of environmental testing conditions to obtain at least two aged B-pillars.

3. The method of claim 1, wherein, 9. The method of claim 1, wherein the determining the reliability of the B-pillar to be tested after use comprises: collecting an image of the aged B-pillar after the simulated crash test; performing image recognition on the image of the aged B-pillar to obtain the outer surface damage condition; and determining the reliability of the B-pillar to be tested after use according to the outer surface damage condition.

10. A reliability testing system of a B-pillar of a vehicle, the system comprising: an environmental simulation device configured to simulate a set environmental testing condition; a high-speed impact trolley configured to crash the aged B-pillar; and a controller configured to control the environmental simulation device to simulate the set environmental testing condition, control the high-speed impact trolley to crash the aged B-pillar, and control the environmental simulation device to perform an aging test on a B-pillar to be tested under the set environmental testing condition to obtain an aged B-pillar. ​ 4. The method of claim 1, wherein, ​ ​ ​ ​ ​ 5. The method of claim 4, wherein, ​ ​ 6. The method according to any one of claims 1 to 5, characterized in that, ​ ​ ​ ​ 7. A reliability test system for a vehicle B-pillar, characterized by, ​ ​ ​ ​ ​ According to the outer surface damage of the aged B column after the simulation collision test, the reliability of the to-be-tested B column after use is determined, comprising: determining the bending state, damage degree and connection integrity of the aged B column after the simulation collision test; if the bending state, damage degree and connection integrity meet the preset test standard, it is determined that the to-be-tested B column has reliability after use. The test standard of the connection integrity includes: the cross-section of the connection part accounts for the minimum area ratio of the cross-section of the new B column.

8. The system of claim 7, wherein, The environment simulation device includes at least one of a temperature regulator, a humidity regulator, a vibration table and a salt spray nozzle.

9. The system of claim 7 or 8, wherein, It also includes a high-speed camera for shooting images of the aged B column after the aging test and images of the aged B column after the simulation collision test.

Images