A vehicle reliability test mileage determination method, system, device and medium

Abstract

This invention proposes a method, system, device, and medium for determining vehicle reliability test mileage, belonging to the field of vehicle reliability testing technology. The method includes: acquiring reliability indicators for the test mileage to be determined, and identifying the corresponding manufacturer's risk and user's risk; initially selecting the identification test mileage range and discrimination ratio range; selecting the minimum test mileage scheme that meets the manufacturer's risk and user's risk based on a minimum mileage scheme model; further selecting the minimum test mileage scheme that meets the requirements based on a preset discrimination ratio range; comprehensively analyzing the test mileage, sample size, number of received faults, and test cycle to select an identification test scheme; executing the identification test scheme; and performing reliability indicator confidence estimation and reliability acceptance judgment based on the test results. This invention can meet the needs of identification test planning at different reliability development levels.

Description

Technical Field

[0001] This invention relates to the field of vehicle reliability testing technology, and more specifically to a method, system, device, and medium for determining vehicle reliability test mileage. Background Technology

[0002] The current testing standards for vehicle reliability assessment are mainly GB / T 1332 and GB / T 13043.

[0003] The two standards stipulate that the base vehicle's on-site enhanced road reliability test mileage is 30,000 km or the conventional road reliability test mileage is 50,000 km, with a sample size of 2 to 5. This test mileage was determined based on the level of automotive reliability development at that time, when the MTBF (Mean Time Between Failures) of trucks was about 2,000 to 3,000 km, and the MTBF of large buses was only 1,534 km.

[0004] With improvements in product design, manufacturing processes, and quality management, the reliability of passenger cars, trucks, and buses has significantly increased. In particular, new energy vehicles have gained widespread market acceptance.

[0005] Currently, the estimated MTBF (Mean Time Between Failures) for freight vehicles is 10,000–15,000 km, and for large buses it is 5,000–10,000 km. However, the existing standard of 50,000 km for conventional road reliability testing or 30,000 km for enhanced on-site road reliability testing significantly reduces the number of faults that can be detected, making the assessment potentially insufficient and increasing the risk for users. Therefore, it is necessary to update the vehicle reliability type approval test procedures and standards.

[0006] In addition, current reliability driving tests mainly assess MTBF, while users are paying more and more attention to the MTBF (Mean Mileage to First Fatal Failure) indicator. At present, there is a lack of reliability assessment test basis for MTBF. If the MTBF is assessed based on the durability test that assesses the overhaul mileage indicator, the test cycle is too long and the cost is too high.

[0007] It is evident that there is a real need for outdated standards. The test mileage in the standards is fixed and too rigid, and there is a lack of methods for determining the vehicle reliability test mileage. Therefore, it is necessary to conduct research on the reliability assessment test schemes for MTBF and MTBCF, especially the methods for determining the test mileage and sample size. Summary of the Invention

[0008] To address the above problems, the present invention aims to provide a method, system, device, and medium for determining vehicle reliability test mileage. This method determines the vehicle reliability qualification test mileage based on reliability indicators, manufacturer risk, and user risk, and can meet the qualification test planning needs of different reliability development levels.

[0009] To achieve the above objectives, this invention provides the following technical solution: a method for determining vehicle reliability test mileage, comprising the following steps: S1: Obtain the reliability indicators of the test mileage to be determined, and determine the corresponding manufacturer risk α, user risk β, and initially select the test mileage range T and the identification ratio range d; S2: Based on the minimum mileage scheme model, select the minimum test mileage scheme that satisfies the producer's risk α and the user's risk β, and use it as the initial minimum test mileage scheme; S3: Based on the preset discrimination ratio range, select the minimum test mileage scheme that meets the requirements from the initial minimum test mileage scheme, and use it as the intermediate minimum test mileage scheme; S4: Comprehensively analyze the test mileage, sample size, number of receiving failures and test cycle, and select the evaluation test scheme from the scheme with the minimum test mileage in the middle. S5: Execute the qualification test plan, and based on the test results, make confidence estimates of reliability indicators and determine reliability acceptance.

[0010] Furthermore, step S1 includes: When the reliability index for the test mileage to be determined is MTBF, the lower limit T0 of the initial selection test mileage range T is the current MTBF value, and the upper limit T0 of the initial selection test mileage range T is... s Gradient accuracy of tests below 500,000 km Not less than 5000km; When the reliability index for the test mileage to be determined is MTBCF, the lower limit T0 of the initial selection test mileage range T is the current MTBCF value, and the upper limit T0 of the initial selection test mileage range T is... s Gradient accuracy of tests below 500,000 km Not less than 10,000 km; When the producer's risk is low, α is 0.1 or 0.2; when the producer's risk is high, α is 0.3. When the user's risk is low, β is 0.1 or 0.2; when the user's risk is high, β is 0.3. Lower limit of the discrimination ratio range d 0.5, upper limit 20, gradient accuracy It is 0.01.

[0011] Furthermore, the minimum mileage scheme model includes the following formula: (1) (2) (3) (4) (5) in, For the risk of the producer, For the user's risk, To distinguish the ratio, This serves as the lower limit for testing reliability assessment indicators. This represents the upper limit of the reliability assessment index for testing. The total test mileage To receive fault counts, To reject the number of faults, For the true value of the reliability index, This represents the probability of receiving the signal.

[0012] Furthermore, step S2 specifically includes the following steps: S21: Enter the test mileage cycle. When executing the test mileage cycle, based on the initial value... Termination value Stepping accuracy Adjust the total test mileage for the current cycle. After each adjustment is completed, proceed to step S22; S22: Enter the fault count loop. When executing the fault count loop, assume the number of faults is a, and use formula (1) to calculate the total test mileage for the current cycle. Satisfying the risks of users Maximum number of receiver failures If the maximum number of receiver failures can be calculated. If the number of faults has been traversed, then step S23 is executed; if the formula (1) has no solution after all faults have been traversed, then step S21 is returned. Step S23: Enter the discrimination ratio loop. When executing the discrimination ratio loop, based on the discrimination ratio d and its initial value... Termination value and step accuracy Using formulas (2), (3), and (4), the total test mileage for the current cycle can be calculated. Maximum number of receiver failures Under the condition of satisfying the producer's risk Minimum discrimination ratio If the minimum discrimination ratio can be calculated If no solution is found using formulas (2), (3), and (4) after all discrimination ratios have been traversed, then return to step S21. Step S24: Total test mileage in the current cycle Maximum number of receiver failures Minimum discrimination ratio Under the given conditions, use formula (5) to calculate the predicted true value. Under these conditions, the product acceptance probability of this reliability test plan Record the corresponding initial minimum test mileage scheme data and execute step S21.

[0013] Furthermore, step S3 includes: The minimum test mileage scheme with a discrimination ratio range of 1 to 3 was selected from the initial minimum test mileage scheme and used as the intermediate minimum test mileage scheme.

[0014] Furthermore, step S4 includes: When the reliability index for the test mileage to be determined is MTBF, it is based on the following formula. The evaluation test scheme was selected from the intermediate minimum test mileage schemes; where N is the sample size. The test mileage for each of the participating vehicles. The test mileage is the minimum test mileage scheme in the middle.

[0015] Furthermore, step S4 also includes: When the reliability index for determining the test mileage is MTBCF, it is based on the following formula. The evaluation test scheme was selected from the intermediate minimum test mileage schemes; where N is the sample size. The test mileage for each of the participating vehicles. The test mileage is the minimum test mileage scheme in the middle.

[0016] Accordingly, the present invention also discloses a vehicle reliability test mileage determination system, comprising: The data preparation module is configured to acquire reliability indicators for the test mileage to be determined, and to determine the corresponding manufacturer risk α, user risk β, and the initial selection of the test mileage range T and the identification ratio range d. The first-level scheme screening module is configured to screen out the minimum test mileage scheme that satisfies the producer's risk α and the user's risk β based on the minimum mileage scheme model, and use it as the initial minimum test mileage scheme. The secondary scheme screening module is configured to select the minimum test mileage scheme that meets the requirements from the initial minimum test mileage scheme based on the preset discrimination ratio range, and use it as the intermediate minimum test mileage scheme. The three-level scheme screening module is configured to comprehensively analyze test mileage, sample size, number of received faults and test cycle, and screen out the evaluation test scheme from the scheme with the shortest test mileage. The acceptance module is configured to execute the qualification test plan and, based on the test results, perform confidence estimation of reliability indicators and reliability acceptance judgment.

[0017] Accordingly, the present invention discloses a vehicle reliability test mileage determination device, comprising: Memory, used to store the program for determining the mileage of vehicle reliability tests; A processor is configured to implement the steps of the vehicle reliability test mileage determination method as described above when executing the vehicle reliability test mileage determination program.

[0018] Accordingly, the present invention discloses a readable storage medium storing a vehicle reliability test mileage determination program, wherein when the vehicle reliability test mileage determination program is executed by a processor, it implements the steps of the vehicle reliability test mileage determination method as described in any of the above.

[0019] Compared with the prior art, the advantages of this invention are as follows: 1. This invention determines the vehicle reliability assessment test mileage based on reliability indicators, manufacturer risk, and user risk. It is flexible and convenient and can meet the assessment test planning needs of different reliability development levels.

[0020] 2. This invention is applicable not only to the planning of test schemes for the identification of vehicle MTBF index, but also to the planning of test schemes for the identification of vehicle MTBF index, making up for the current lack of reliability identification test methods for MTBF index in the vehicle industry.

[0021] 3. The minimum mileage scheme model and its algorithm used in this invention can be programmably calculated, which is efficient and convenient. The resulting list of test schemes are all minimum test mileage schemes, which can reduce test costs.

[0022] 4. This invention can comprehensively consider factors such as test cycle and development cost, and provides a more scientific, practical and economical test scheme determination method for the reliability assessment of vehicle products.

[0023] Therefore, it is evident that the present invention has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a flowchart illustrating a specific embodiment of the present invention.

[0026] Figure 2 This is a flowchart illustrating step S2 of a specific embodiment of the present invention.

[0027] Figure 3 This is a system structure diagram of a specific embodiment of the present invention.

[0028] In the diagram, 1. Data preparation module; 2. Primary solution selection module; 3. Secondary solution selection module; 4. Tertiary solution selection module; 5. Acceptance module. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] See Figure 1 As shown, this invention discloses a method for determining vehicle reliability test mileage, comprising the following steps: S1: Obtain the reliability indicators of the test mileage to be determined, and determine the corresponding manufacturer risk α, user risk β, and initially select the test mileage range T and the identification ratio range d.

[0031] In this step, the relevant basic parameters are determined as follows: (1) The reliability assessment indicators can be the mean time between failures (MTBF) and the mean time to first fatal failure (MTBCF). The specific values ​​of MTBF and MTBCF are determined according to the agreement and contract requirements between the user and the manufacturer.

[0032] (2) The producer's risk α and the user's risk β are generally divided into two levels: low risk and high risk. The specific values ​​of producer's risk α and user's risk β are determined according to the agreement and contract requirements between the user and the producer. If there are no specific provisions, α and β can both be 0.1 or 0.2 for low risk, and α and β can both be 0.3 for high risk.

[0033] (3) Lower limit of the preliminary selection test mileage T Upper limit and gradient accuracy .

[0034] (a) When identifying the MTBF index, Not less than the MTBF index; when determining the MTBF index, Not less than MTBCF.

[0035] (b) Upper limit of test mileage Under current vehicle reliability conditions, it is generally not necessary to exceed 500,000 kilometers.

[0036] (c) Gradient accuracy during the MTBF index qualification test planning. Not less than 5000km; gradient accuracy during the MTBF index qualification test planning. Not less than 10,000 km.

[0037] (4) For the range of the discrimination ratio d, first take the lower limit of the discrimination ratio. The upper limit of the discrimination ratio is 0.5. The gradient accuracy is 20. It is 0.01.

[0038] As an example, if the protocol specifies α and β as 0.2, and the protocol specifies MTBF as 10000 km, then the lower limit of the qualification test mileage is... Take 10,000km as the upper limit. 100,000 km can be selected, gradient accuracy Take 5000m, and determine the lower limit of the discrimination ratio. Set the value to 0.5, which is the upper limit of the discrimination ratio. Set to 20, and the discrimination ratio gradient accuracy. The value is 0.01. Correspondingly, for MTBCF implementation examples, the upper limit of the MTBCF qualification test mileage is generally quite large. 500,000 km is acceptable.

[0039] S2: Based on the minimum mileage scheme model, select the minimum test mileage scheme that satisfies the producer's risk α and the user's risk β, and use it as the initial minimum test mileage scheme.

[0040] In a specific implementation, the minimum test mileage scheme is determined using a standard timed Poisson distribution model and a timed truncated test method. The specific minimum mileage scheme model includes the following formula: (1) (2) (3) (4) (5) in, For the risk of the producer, For the user's risk, To distinguish the ratio, This serves as the lower limit for testing reliability assessment indicators. This represents the upper limit of the reliability assessment index for testing. The total test mileage Number of received faults (integer) For the number of rejected faults (integer), formula (4) is: and The relationship. For the true value of the reliability index, This represents the probability of receiving the signal.

[0041] It should be noted that formula (5) is based on the true value of the reliability index. With the probability of receiving The relationship between these factors can be used to assess the probability of success or failure in experimental design.

[0042] In a specific implementation, based on the aforementioned minimum mileage scheme model, such as Figure 2 As shown, the specific execution process of step S2 is as follows: S21: Enter the test mileage cycle. When executing the test mileage cycle, based on the initial value... Termination value Stepping accuracy Adjust the total test mileage for the current cycle. After each adjustment is completed, proceed to step S22.

[0043] S22: Enter the fault count loop. When executing the fault count loop, assume the number of faults is a, and use formula (1) to calculate the total test mileage for the current cycle. Satisfying the risks of users Maximum number of receiver failures If the maximum number of receiver failures can be calculated. If the number of faults has been traversed, then step S23 is executed; if the formula (1) has no solution after all faults have been traversed, then step S21 is returned.

[0044] Step S23: Enter the discrimination ratio loop. When executing the discrimination ratio loop, based on the discrimination ratio d and its initial value... Termination value and step accuracy Using formulas (2), (3), and (4), the total test mileage for the current cycle can be calculated. Maximum number of receiver failures Under the condition of satisfying the producer's risk Minimum discrimination ratio If the minimum discrimination ratio can be calculated If no solution is found using formulas (2), (3), and (4) after all discrimination ratios have been traversed, then return to step S21.

[0045] Step S24: Total test mileage in the current cycle Maximum number of receiver failures Minimum discrimination ratio Under the given conditions, use formula (5) to calculate the predicted true value. Under these conditions, the product acceptance probability of this reliability test plan Record the corresponding initial minimum test mileage scheme data and execute step S21.

[0046] S3: Based on the preset discrimination ratio range, select the minimum test mileage scheme that meets the requirements from the initial minimum test mileage scheme, and use it as the intermediate minimum test mileage scheme.

[0047] In a specific implementation, the minimum test mileage scheme with a discrimination ratio range of 1 to 3 is selected from the initial minimum test mileage scheme and used as the intermediate minimum test mileage scheme.

[0048] S4: Based on a comprehensive analysis of test mileage, sample size, number of reception failures, and test cycle, select the evaluation test scheme from the schemes with the shortest test mileage.

[0049] In a specific implementation, when the reliability index of the test mileage to be determined is MTBF, it is calculated according to the following formula. The evaluation test scheme was selected from the intermediate minimum test mileage schemes; where N is the sample size. The test mileage for each of the participating vehicles. The test mileage is the minimum test mileage scheme in the middle.

[0050] When the reliability index for determining the test mileage is MTBCF, it is based on the following formula. The evaluation test scheme was selected from the intermediate minimum test mileage schemes; where N is the sample size. The test mileage for each of the participating vehicles. The test mileage is the minimum test mileage scheme in the middle.

[0051] S5: Execute the qualification test plan, and based on the test results, make confidence estimates of reliability indicators and determine reliability acceptance.

[0052] In specific implementations, the acceptance criteria for vehicle product reliability can be based on whether the number of failures tested exceeds the maximum number of acceptable failures, or it can be determined using the confidence estimation method according to GB / T 12678. The specific calculation process is as follows: in, These are point estimates from reliability testing. The lower confidence limit of the MTBF for reliability testing is given by r, where r is the total number of Class 1, 2, and 3 failures occurring within the total test mileage. For degrees of freedom Confidence level is of Distribution value.

[0053] To better illustrate the above method, the following specific example demonstrates the screening process for identification test protocols based on this method: When the lower limit of the identification test mileage Take 10,000km as the upper limit. Taking 100,000 km as an example, gradient accuracy Take 5000km, lower limit of discrimination ratio Set to 1, upper limit of discrimination ratio. Set to 3, and the discrimination ratio gradient accuracy. When the value is 0.01, the initial minimum test mileage scheme of MTBF is obtained through step S2 based on the minimum mileage scheme model and model algorithm. The specific contents are shown in Table 1 below.

[0054] Table 1. Examples of Initial Minimum Test Mileage Scheme Results Based on the above results, according to the method in step S3, only the minimum test mileage schemes that meet the discrimination ratio range of 1 to 3 are retained, thus selecting the intermediate minimum test mileage schemes. The specific details are shown in Table 2 below: Table 2 Examples of results for the intermediate minimum test mileage scheme Based on the above results, and following step S4's comprehensive analysis of test mileage, sample size, number of reception failures, test cycle, and development costs, a qualification test plan was selected. Specifically, only the plan with the fewest test mileage for the same number of reception failures was retained; furthermore, to save development costs, a total test mileage of 60,000 km was recommended. Test plans with 2 prototype vehicles (average test mileage per vehicle 30,000 km), 3 prototype vehicles (average test mileage per vehicle 20,000 km), and 4 prototype vehicles (average test mileage per vehicle 15,000 km) can be selected. The resulting qualification test plans are shown in Table 3 below: Table 3 Example 1 of the results of the identification test protocol In addition, to better illustrate the solution acceptance process in step S5 of the above method, the following specific example illustrates the solution acceptance process: In this example, the specific identification test protocol used is shown in Table 4 below: Table 4 Example 2 of the results of the identification test protocol Based on the above-mentioned qualification test plan, reliability tests were conducted on two reliability prototype vehicles with a total mileage of 60,000 kilometers. Only three general failures were allowed; otherwise, the vehicle was deemed not to have met the reliability MTBF (Mean Time Between Failures) requirement. During the test, if 0, 1, 2, or 3 general failures occurred, the reliability acceptance test was considered passed, and the estimated lower confidence limits of MTBF were 37,300 km, 19,800 km, 14,100 km, and 10,800 km, respectively.

[0055] Therefore, the present invention provides a method for determining the mileage of vehicle reliability testing. Based on reliability indicators, manufacturer risk, and user risk, the method determines the mileage of vehicle reliability assessment testing, which is flexible and convenient and can meet the needs of assessment testing planning at different reliability development levels.

[0056] Based on the above embodiments, such as Figure 3 As shown, the present invention also discloses a vehicle reliability test mileage determination system, including: a data preparation module 1, a first-level scheme screening module 2, a second-level scheme screening module 3, a third-level scheme screening module 4, and an acceptance module 5.

[0057] Data preparation module 1 is configured to obtain reliability indicators for the test mileage to be determined, and to determine the corresponding manufacturer risk α, user risk β, and initially select the test mileage range T and the identification ratio range d.

[0058] The first-level scheme screening module 2 is configured to screen out the minimum test mileage scheme that satisfies the producer's risk α and the user's risk β based on the minimum mileage scheme model, and use it as the initial minimum test mileage scheme.

[0059] The secondary scheme screening module 3 is configured to select the minimum test mileage scheme that meets the requirements from the initial minimum test mileage scheme based on the preset discrimination ratio range, and use it as the intermediate minimum test mileage scheme.

[0060] The third-level scheme screening module 4 is configured to comprehensively analyze test mileage, sample size, number of received faults, and test cycle, and select the evaluation test scheme from the schemes with the shortest test mileage.

[0061] Acceptance module 5 is configured to execute the qualification test plan and, based on the test results, perform confidence estimation of reliability indicators and reliability acceptance judgment.

[0062] The specific implementation of the vehicle reliability test mileage determination system in this embodiment is basically the same as the specific implementation of the vehicle reliability test mileage determination method described above, and will not be repeated here.

[0063] The present invention also discloses a vehicle reliability test mileage determination device, including a processor and a memory; wherein, when the processor executes the vehicle reliability test mileage determination program stored in the memory, it implements the steps of the vehicle reliability test mileage determination method as described in any of the above.

[0064] Furthermore, the vehicle reliability test mileage determination device in this embodiment may also include: The input interface is used to acquire vehicle reliability test mileage determination programs imported from external sources and save these programs to the memory. It can also acquire various instructions and parameters transmitted from external terminal devices and transmit them to the processor, allowing the processor to perform corresponding processing using these instructions and parameters. In this embodiment, the input interface may specifically include, but is not limited to, a USB interface, a serial interface, a voice input interface, a fingerprint input interface, and a hard disk read interface.

[0065] An output interface is used to output various data generated by the processor to connected terminal devices, so that other terminal devices connected to the output interface can obtain the various data generated by the processor. In this embodiment, the output interface may include, but is not limited to, a USB interface, a serial interface, etc.

[0066] A communication unit is used to establish a remote communication connection between the vehicle reliability test mileage determination device and an external server, so that the vehicle reliability test mileage determination device can mount the image file to the external server. In this embodiment, the communication unit may specifically include, but is not limited to, a remote communication unit based on wireless communication technology or wired communication technology.

[0067] The keyboard is used to acquire various parameter data or commands input by the user through real-time keystrokes.

[0068] The display is used to show relevant information in real time during the process of determining the mileage of vehicle reliability tests.

[0069] A mouse can be used to assist users in inputting data and simplifying user operations.

[0070] This invention also discloses a readable storage medium, which includes random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage medium known in the art. The readable storage medium stores a vehicle reliability test mileage determination program, which, when executed by a processor, implements the steps of the vehicle reliability test mileage determination method as described in any of the preceding embodiments.

[0071] In summary, this invention determines the vehicle reliability assessment test mileage based on reliability indicators, manufacturer risk, and user risk, which can meet the assessment test planning needs of different reliability development levels.

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The methods disclosed in the embodiments are described simply because they correspond to the systems disclosed in the embodiments; relevant details can be found in the method section.

[0073] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0074] In the embodiments provided by this invention, it should be understood that the disclosed systems, methods, and approaches can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between systems or units may be electrical, mechanical, or other forms.

[0075] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0076] In addition, the functional modules in the various embodiments of the present invention can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit.

[0077] Similarly, in the various embodiments of the present invention, each processing unit can be integrated into a functional module, or each processing unit can exist physically, or two or more processing units can be integrated into a functional module.

[0078] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0079] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0080] The method, system, apparatus, and readable storage medium for determining vehicle reliability test mileage provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A method for determining vehicle reliability test mileage, characterized in that, The steps include the following: S1: Obtain the reliability indicators of the test mileage to be determined, and determine the corresponding manufacturer risk α, user risk β, and initially select the test mileage range T and the identification ratio range d; S2: Based on the minimum mileage scheme model, select the minimum test mileage scheme that satisfies the producer's risk α and the user's risk β, and use it as the initial minimum test mileage scheme; S3: Based on the preset discrimination ratio range, select the minimum test mileage scheme that meets the requirements from the initial minimum test mileage scheme, and use it as the intermediate minimum test mileage scheme; S4: Comprehensively analyze the test mileage, sample size, number of receiving failures and test cycle, and select the evaluation test scheme from the scheme with the minimum test mileage in the middle. S5: Execute the qualification test plan, and based on the test results, make confidence estimates of reliability indicators and determine reliability acceptance. Step S1 includes: When the reliability index for the test mileage to be determined is MTBF, the lower limit T0 of the initial selection test mileage range T is the current MTBF value, and the upper limit Ts of the initial selection test mileage range T is less than 500,000 km, the gradient accuracy of the test is... Not less than 5000km; When the reliability index for the test mileage to be determined is MTBCF, the lower limit T0 of the initial selection test mileage range T is the current MTBCF value, and the upper limit Ts of the initial selection test mileage range T is less than 500,000 km. The gradient accuracy of the test... Not less than 10,000 km; When the producer's risk is low, α is 0.1 or 0.2; when the producer's risk is high, α is 0.

3. When the user's risk is low, β is 0.1 or 0.2; when the user's risk is high, β is 0.

3. Lower limit of the discrimination ratio range d 0.5, upper limit 20, gradient accuracy It is 0.01; The minimum mileage scheme model includes the following formulas: （1） （2） （3） （4） （5） in, For the risk of the producer, For the user's risk, To distinguish the ratio, This serves as the lower limit for testing reliability assessment indicators. This represents the upper limit of the reliability assessment index. The total test mileage To receive fault counts, To reject the number of faults, For the true value of the reliability index, This represents the probability of receiving the signal. Step S2 specifically includes the following steps: S21: Enter the test mileage cycle. When executing the test mileage cycle, based on the initial value... Termination value Stepping accuracy Adjust the total test mileage for the current cycle. After each adjustment is completed, proceed to step S22; S22: Enter the fault count loop. When executing the fault count loop, assume the number of faults is a, and use formula (1) to calculate the total test mileage for the current cycle. Satisfying the risks of users Maximum number of receiver failures If the maximum number of receiver failures can be calculated. If the number of faults has been traversed, then step S23 is executed; if the formula (1) has no solution after all faults have been traversed, then step S21 is returned. Step S23: Enter the discrimination ratio loop. When executing the discrimination ratio loop, based on the discrimination ratio d and its initial value... Termination value and step accuracy Using formulas (2), (3), and (4), the total test mileage for the current cycle can be calculated. Maximum number of receiver failures Under the condition of satisfying the producer's risk Minimum discrimination ratio If the minimum discrimination ratio can be calculated If no solution is found using formulas (2), (3), and (4) after all discrimination ratios have been traversed, then return to step S21. Step S24: Total test mileage in the current cycle Maximum number of receiver failures Minimum discrimination ratio Under the given conditions, use formula (5) to calculate the predicted true value. Under these conditions, the product acceptance probability of this reliability test plan Record the corresponding initial minimum test mileage scheme data and execute step S21; Step S3 includes: The minimum test mileage scheme with a discrimination ratio range of 1 to 3 was selected from the initial minimum test mileage scheme and used as the intermediate minimum test mileage scheme; Step S4 includes: When the reliability index for the test mileage to be determined is MTBF, it is based on the following formula. The evaluation test scheme was selected from the intermediate minimum test mileage schemes; where N is the sample size. The test mileage for each of the participating vehicles. The test mileage is the minimum test mileage scheme in the middle.

2. The method for determining vehicle reliability test mileage according to claim 1, characterized in that, Step S4 further includes: When the reliability index for determining the test mileage is MTBCF, it is based on the following formula. The evaluation test scheme was selected from the intermediate minimum test mileage schemes; where N is the sample size. The test mileage for each of the participating vehicles. The test mileage is the minimum test mileage scheme in the middle.

3. A vehicle reliability test mileage determination system, applicable to the vehicle reliability test mileage determination method according to any one of claims 1-2, characterized in that, include: The data preparation module is configured to acquire reliability indicators for the test mileage to be determined, and to determine the corresponding manufacturer risk α, user risk β, and the initial selection of the test mileage range T and the identification ratio range d. The first-level scheme screening module is configured to screen out the minimum test mileage scheme that satisfies the producer's risk α and the user's risk β based on the minimum mileage scheme model, and use it as the initial minimum test mileage scheme. The secondary scheme screening module is configured to select the minimum test mileage scheme that meets the requirements from the initial minimum test mileage scheme based on the preset discrimination ratio range, and use it as the intermediate minimum test mileage scheme. The three-level scheme screening module is configured to comprehensively analyze test mileage, sample size, number of received faults and test cycle, and screen out the evaluation test scheme from the scheme with the shortest test mileage. The acceptance module is configured to execute the qualification test plan and, based on the test results, perform confidence estimation of reliability indicators and reliability acceptance judgment.

4. A vehicle reliability test mileage determination device, characterized in that, include: Memory, used to store the program for determining the mileage of vehicle reliability tests; A processor is configured to implement the steps of the vehicle reliability test mileage determination method as described in any one of claims 1 to 2 when executing the vehicle reliability test mileage determination program.

5. A readable storage medium, characterized in that: The readable storage medium stores a vehicle reliability test mileage determination program, which, when executed by a processor, implements the steps of the vehicle reliability test mileage determination method as described in any one of claims 1 to 2.

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