Automobile system reliability test specification establishment method and system

Abstract

The invention discloses an automobile system reliability test specification establishment method and system, and belongs to the technical field of automobile system tests.The method comprises the steps that the object and range of an automobile system reliability test are determined through a reliability block diagram analysis method, and automobile system composition and structure analysis is conducted; performing automobile system function and performance analysis on the object and range of the automobile system reliability test based on the result of the automobile system composition and structure analysis; on the basis of automobile system function and performance analysis, environment stress, a user use environment and a user scene borne by an automobile system in the storage and transportation processes and during service are simulated; and identifying a comprehensive stress influence result generated by the stress on the reliability of the automobile system by adopting an accelerated test method, and establishing an automobile system reliability test specification based on the comprehensive stress influence result. According to the method, through combination of automobile system analysis, acceleration test and data driving, efficiency and precision of reliability verification are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile system testing, and more particularly to a method and system for establishing automobile system reliability testing specifications. Background Art

[0002] With the continuous development of new automotive technologies, especially the "four modernizations," vehicle composition and structure are constantly changing, new vehicle systems are constantly evolving, and vehicle functions and performance are becoming increasingly diverse. This has also led to the emergence of many new user scenarios. In this context, the reliability of vehicle systems has become particularly important.

[0003] Automotive systems are composed of a variety of components connected and interacting in various ways. Automotive system reliability is the reliability of the integrated components, built upon their own reliability. During the automotive system development phase, automotive system reliability verification serves as a test of the system's reliability design and is the final step in automotive system development.

[0004] Existing automotive system reliability test specifications are mostly based on a combination of environmental and user conditions, lacking a comprehensive automotive system methodology. Complex factors influence automotive system reliability, including environmental stresses, user profiles, and user usage scenarios. Therefore, these factors must be considered in automotive system reliability testing.

[0005] Therefore, how to scientifically establish automotive system reliability test specifications to guide the implementation of automotive system reliability tests is the key to automotive system reliability verification. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a method and system for establishing automobile system reliability test specifications. This method achieves both efficiency and accuracy improvements in reliability verification by combining automobile system analysis, accelerated testing and data-driven testing.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a method for establishing an automotive system reliability test specification, comprising: S1, determine the object and scope of the automobile system reliability test through the reliability block diagram analysis method, and conduct automobile system composition and structure analysis based on the object and scope of the automobile system reliability test; S2, based on the results of the automobile system composition and structure analysis, conduct automobile system function and performance analysis on the object and scope of automobile system reliability test; S3, based on the analysis of the vehicle system's functions and performance, simulates the environmental stresses, user environments, and user scenarios to which the vehicle system is subjected during storage, transportation, and service. Acceleration is performed within a set test cycle to obtain the reliability risk of the vehicle system. Based on the reliability risk analysis of the vehicle system, the environmental stresses, user profiles, and scenarios throughout the vehicle system's life cycle are completed. S4, during the automobile system usage phase, analyze the user's usage data to determine the user's cyclic distribution of automobile system usage; S5, based on the analysis of environmental stress, user profiles and scenarios throughout the entire life cycle of the automotive system and the definition of the user's use cycle distribution of the automotive system, uses accelerated test methods to identify the comprehensive stress impact results of stress on the reliability of the automotive system, and establishes automotive system reliability test specifications based on the comprehensive stress impact results.

[0008] As a further improvement of the present invention, the object and scope of the automobile system reliability test are determined to include key connections and interactive parts of the automobile system.

[0009] As a further improvement of the present invention, the automobile system composition and structure analysis includes one or more of the composition and connection relationship within the automobile system, automobile system boundary components that have a significant impact on automobile system reliability, and the impact of the boundary automobile system; The composition and connection relationship of the automobile system includes at least one or more of hardware connection, software communication and control, among which the hardware connection includes one or more of bolt connection, riveting, welding, pressing, hemming and wiring harness, and the software communication and control includes at least one or more of input information flow and output control command.

[0010] As a further improvement of the present invention, the analysis of the composition and structure of the automobile system adopts a reliability block diagram method, which specifically includes: First, distinguish the critical / non-critical components in the composition of the automobile system that affect the reliability of the automobile system, and secondly distinguish the importance of various connection relationships.

[0011] As a further improvement of the present invention, the object and scope of the automobile system reliability test are analyzed for automobile system functions and performances, including whether functions fail and whether performance declines.

[0012] As a further improvement of the present invention, in the analysis of the functions and performance of the automobile system based on the objects and scope of the automobile system reliability test, the functions and performance of the automobile system are defined using a multi-dimensional full-matrix analysis method, including: the requirements of market laws and regulations, user demand for automobile systems, demand for products that surpass competitors, requirements of the automobile system professional development plan, and the creative functions and performance of the automobile system.

[0013] As a further improvement of the present invention, the simulated environmental stress, user usage environment and user scenarios to which the automobile system is subjected during storage, transportation and service refer to the influencing factors that directly affect the reliability of the automobile system in the user usage scenarios, user usage profiles and environmental stresses during the entire life cycle of the automobile system, from vehicle transportation, storage, user use to vehicle scrapping, after the automobile system is completed and assembled on the vehicle. All influencing factors are analyzed and identified during the automobile system reliability analysis process and incorporated into the test specifications.

[0014] As a further improvement of the present invention, the analyzing of the user's usage data during the automobile system usage phase to determine the user's cyclic distribution of automobile system usage includes: Based on user usage data and combined with the car system startup strategy, the distribution of the number of times the car system is turned on is analyzed, and then the probability density distribution of the startup data is obtained. Based on the probability density distribution of the startup data, the cyclic distribution of the user's use of the car system is determined.

[0015] As a further improvement of the present invention, the use of the accelerated test method to identify the comprehensive stress impact of stress on the reliability of the automobile system includes: The accelerated test method includes: stress analysis and identification, selecting an acceleration model based on the identification results, determining the sample size for the vehicle system reliability test, and then determining the vehicle system usage time, acceleration factor, and accelerated test cycle based on the acceleration model, and finally completing the accelerated test; Among them, stress analysis identification is to determine the environmental factors that are affected during the entire life cycle of the automotive system; the automotive system is affected by various stresses during its entire life cycle. Different stresses will cause different failures / malfunctions or impacts on the reliability of the automotive system, and the comprehensive stress impact results can be obtained by identification.

[0016] As a further improvement of the present invention, determining the sample size for the automobile system reliability test includes: The Bogey test model is used to calculate the number of accelerated test cycles to ensure that the number of test cycles meets the following requirements: N=ln(1-C) / lnR×α×β Where: N is the number of samples; C is the confidence level; R is the reliability; α is the life multiple; β is the shape parameter, which is selected in combination with the reliability design level of the automobile system.

[0017] As a further improvement of the present invention, the reliability test specification of the automobile system is established by analyzing the test process and analysis of S1 to S5, including: The correlation between subjective evaluation and objective measurement is analyzed to ensure that the requirements of both are consistent with user perception. Based on the analysis of the user's full-dimensional, strongly perceived subjective evaluation and objective measurement items, the evaluation content before, during, and after the automotive system reliability test is determined to obtain the final automotive system reliability test specifications.

[0018] In a second aspect, the present invention provides a system for establishing automotive system reliability test specifications, comprising: Select a unit, select an automotive system for which reliability test specifications are to be established, and conduct a test based on the test unit, wherein the test unit includes: The composition and structure analysis module 100 is used to determine the object and scope of the automobile system reliability test through the reliability block diagram analysis method, and perform automobile system composition and structure analysis based on the object and scope of the automobile system reliability test; Function and performance analysis module 200, for performing automobile system function and performance analysis on the object and scope of automobile system reliability test based on the results of automobile system composition and structure analysis; The full lifecycle simulation module 300 is used to simulate the environmental stresses, user environments, and user scenarios to which the vehicle system is subjected during storage, transportation, and service, based on the analysis of the vehicle system's functions and performance. The module also accelerates the test within a set test cycle to obtain the reliability risks of the vehicle system. Based on the reliability risk analysis of the vehicle system, the module completes the environmental stresses, user profiles, and scenarios of the vehicle system throughout its lifecycle. The usage data analysis module 400 is used to analyze the user's usage data during the automobile system usage phase to determine the user's usage cycle distribution of the automobile system; The accelerated testing module 500 is used to identify the comprehensive stress impact of stress on the reliability of the automotive system using accelerated testing methods based on the analysis of environmental stress, user profiles and scenarios throughout the entire life cycle of the automotive system and the determination of the user's usage cycle distribution of the automotive system; Establish a unit for the test process and analysis of the test unit and establish reliability test specifications for automotive systems.

[0019] The beneficial effects of the present invention compared to the prior art are: The method described in this paper covers the entire lifecycle (design, production, and service), from unit-level reliability to comprehensive stress at the vehicle system level. This approach avoids the limitations of traditional testing that focuses on a single stress or stage. By accelerating testing, efficiency is improved, compressing years of aging to weeks, and accelerating vehicle system life testing. By analyzing user usage data, unnecessary testing is reduced. For example, cluster analysis can be used to eliminate low-frequency usage scenarios, exposing design flaws early and preventing defects from being discovered before mass production recalls. The method integrates the coupled and interactive effects of multiple stresses, such as temperature, humidity, and vibration, such as the exacerbation of crack propagation in materials due to humid and hot environments. Test profiles are constructed using real-world usage data, such as analysis of the electric rear wing's usage cycle, simulating user scenarios. Ultimately, by combining vehicle system analysis, accelerated testing, and data-driven approaches, the method improves both the efficiency and accuracy of reliability verification, transforming traditional post-testing into preventative verification during the design phase. This provides a quantifiable, closed-loop solution for automotive system reliability engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following introduction is made to the drawings of the embodiments of the present invention or the related technical solutions in the prior art. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 Establishing a schematic diagram for the automotive system reliability test specification of the present invention; Figure 2 It is a schematic diagram of the frameless window lifting system of the present invention; Figure 3 A schematic diagram of the needs and requirements analysis of the automotive system of the present invention; Figure 4 This is a schematic diagram of the user data analysis process of the present invention; Figure 5 Schematic diagram of the probability density distribution of the first and second gear opening data of the electric tail system of the present invention; Figure 6 Schematic diagram of the probability density distribution (95%) of the first gear opening data of the electric tail system of the present invention; Figure 7 Schematic diagram of the probability density distribution (95%) of the second gear opening data of the electric tail system of the present invention; Figure 8 Establishing a path diagram for the automotive system acceleration test method of the present invention; Figure 9 A system diagram is established for the automotive system reliability test specification of the present invention. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention. The step numbers in the following embodiments are provided for ease of explanation only and do not limit the order of the steps. The order of execution of the steps in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0024] The automotive system described in this invention is composed of multiple components connected or interacting in various ways. Automotive system reliability is the reliability of the integrated components, built upon their own reliability. During the automotive system development phase, automotive system reliability verification serves as a test of the system's reliability design and is the final step in automotive system development.

[0025] The present invention is based on the analysis during the establishment process of automobile system reliability test specifications, and establishes a complete systematic method for establishing reliability test specifications, covering the reliability influencing factors at the automobile system level, including the environmental stress to which the automobile system is subjected, the user usage profile of the automobile system, and the user usage scenarios of the automobile system. Based on this method, the automobile system reliability test specifications can more completely cover the reliability influencing factors of the automobile system throughout its life cycle, and reliability testing will be more effective.

[0026] The embodiment of the present invention provides a method for establishing a reliability test specification for an automobile system. Figure 1 The main steps include: S1, automobile system composition and structure analysis; S2, automobile system function and performance analysis; S3, automobile system environmental stress analysis and identification; S4, automobile system user profile / user scenario analysis; S5, user usage data analysis; S6, establishment of automobile system accelerated test method.

[0027] Among them, the analysis of automobile system composition and structure is the basis for establishing automobile system reliability test specifications. Through the reliability block diagram analysis method, the object and scope of automobile system reliability test are determined, including key connections and interaction parts.

[0028] After determining the test targets for automotive system reliability, the system's functions and performance need to be analyzed. This measurement and evaluation includes determining whether functions have failed or performance has degraded. Based on this analysis of the system's functions and performance, the automotive system reliability testing methodology simulates the natural environment, user environment, and user scenarios to which the system is exposed during storage, transportation, and service. Acceleration testing is performed within a specific test cycle to assess the reliability risks of the vehicle system.

[0029] Furthermore, it is necessary to analyze user profiles, user scenarios, and environmental stresses. Users repeatedly use vehicle systems every day. The number of cycles a user uses within a certain timeframe is a key component of vehicle system reliability testing, and user data analysis is required to determine the distribution of these cycles.

[0030] Finally, based on the analysis of environmental stress, user profiles and scenarios, and number of working cycles throughout the entire life cycle of the automotive system, an accelerated test design is conducted to establish automotive system reliability test specifications.

[0031] The above solution is described in detail below with reference to specific embodiments.

[0032] S1, composition and structural analysis steps of the automobile system; The composition and structure of automotive systems are key to their overall form and directly impact their operational reliability. Robust design of these components and structures significantly enhances their reliability. Analysis of automotive system composition and structure encompasses the internal components and connections within the automotive system, as well as the impact of boundary components or systems that significantly impact system reliability. The composition and connections of automotive systems encompass both hardware connections and software communication and control. Hardware connections include bolting, riveting, welding, pressing, hemming, and wiring harnesses, while software communication and control encompasses input information flows and output control commands.

[0033] The analysis of the composition and structure of automotive systems is conducted using a method similar to reliability block diagrams. Using this block diagram, we first identify critical and non-critical components that affect system reliability, and then categorize the importance of various connections. The following analysis uses the left front door frameless window lift system of a certain vehicle model as an example to illustrate the composition and structure of the automotive system.

[0034] As a preferred solution, the present invention can also adopt the following optimized solution: automobile system reliability block diagram analysis, clarify the series and parallel relationship of automobile system units through the reliability block diagram (RBD), establish a mathematical model (such as the series automobile system formula Rs ( t )=∏ Ri (t ), Parallel Vehicle System Formula Rs ( t )=1-∏(1- Ri ( t ))), quantify the impact of each unit on the overall reliability and provide a basis for screening test subjects.

[0035] Figure 2 This is a block diagram of the frameless window lift system. The key / non-critical components for reliability include the B-pillar clip, B-pillar guide rail, side panel assembly, side panel sealing strip assembly, triangle block, and triangle block sealing strip; it also includes the glass assembly connected to the side panel sealing strip assembly, the glass lifter assembly (including the motor), the glass lifter assembly and the door inner panel, the door outer panel, the inner water retaining strip assembly for the door inner panel, and the outer water retaining strip assembly for the door outer panel.

[0036] Among them, the triangular block sealing strip is connected to the triangular window glass assembly, the A-pillar guide rail, and the A-pillar sealing strip assembly. In addition, the door inner panel is connected to the A-pillar guide rail.

[0037] Among them, the window lifter assembly is connected to the body domain controller, window lift switch, power supply vehicle system, etc.

[0038] The specific connection relationship is as follows Figure 2 As shown, 1 represents bolt / screw connection, 2 represents snap connection, 3 represents snap connection, 4 represents press fit, 5 represents wire harness connection, and 6 represents compression interference relationship.

[0039] S2, functional and performance analysis steps of the automotive system; The functionality and performance of automotive systems are among their attributes. These definitions are based on the following: 1. Market legal and regulatory requirements; 2. User demand for automotive systems; 3. The need to surpass competitors' products; 4. Requirements from the automotive systems professional development plan; and 5. The innovative functionality and performance of automotive systems. In analyzing automotive system functionality and performance, a full matrix analysis approach based on these five dimensions is used to define the functionality and performance of automotive systems, including reliability.

[0040] Below, we analyze the definition of the functions and performance of automotive systems using the frameless window lift system of a certain car model as an example.

[0041] Specifically, user requirements for automotive systems include: sight, hearing, speech, touch, and smell. Specifically, sight requires the sealing strips to be well matched with the exterior, and the window lifting and lowering to be stable. Hearing requires quiet operation, especially at high speeds. Speaking requires voice control of the windows. Touch requires no pinching and a stable feel when leaning against the windows. Smell requires no odors (typically from sealing strips, lubricants, etc.).

[0042] Requirements of the automotive system professional development plan, such as frameless windows, modular windows, etc.; creative functions and performance of automotive systems, such as PWM, smart display windows, heated windows, etc.

[0043] As a preferred solution, the present invention can also adopt the following optimized solutions: Function and performance analysis: Based on structural analysis, through functional decomposition (such as Delta block diagram method), the performance thresholds of key functional nodes (such as window lift motors, sensors) are identified to provide boundary conditions for environmental stress simulation.

[0044] S3, analyze the environmental stress, user profile and user scenario steps of the entire life cycle of the automotive system, such as Figure 3 shown.

[0045] After an automotive system is manufactured and assembled on a vehicle, throughout its lifecycle, from transportation and storage to user use and scrapping, user usage scenarios, user usage profiles, and environmental stresses directly impact the reliability of the automotive system. Therefore, during the automotive system reliability analysis process, it is important to analyze and identify these influencing factors and incorporate them into the test specifications. Specifically, these factors may include: S3.1. Identification of environmental stress during transportation / storage of the automotive system; the identification results shall be recorded using the record sheet shown in Table 1.

[0046] Table 1 Environmental stress analysis record of automobile system transportation / storage process

[0047] Table 1 is only an example of a reference table. The specific content can be recorded according to the actual situation.

[0048] S3.2, user profile and user scenario analysis; The factors influencing automotive systems during user use are complex. These factors are influenced by environmental stress, the user's usage profile, and the user's usage scenarios. Therefore, a detailed analysis of the reliability of automotive systems during user use is necessary. The analysis results are recorded using the table shown in Table 1.

[0049] Table 2 Automobile system reliability analysis records during user use

[0050] Table 2 is only an example of a reference table. The specific table content can be recorded according to the actual situation.

[0051] S4, user usage data analysis step.

[0052] The analysis of user usage data is an important part of the automotive system reliability test specification. The analysis of user data includes the following aspects: data collection, data preprocessing, data statistical analysis and data mining. The process of data analysis is as follows: Figure 4 shown.

[0053] Figure 5 The probability density distribution of the electric rear spoiler system's first and second gear activation data is based on the user's vehicle speed data and the first and second gear activation strategies of the electric rear spoiler system. This analyzes the distribution of the number of times the electric rear spoiler is activated in first and second gear. Figure 6 The probability density distribution of the electric rear spoiler system's first gear opening data (95%); Figure 7 This is the probability density distribution (95%) of the electric rear wing system's second-gear opening data. The number of operating cycles in the reliability test specification can be determined based on the user coverage target in the automotive system reliability design requirements.

[0054] As a preferred solution, the present invention can also adopt the following optimized solution: user usage data analysis, using funnel analysis to track user operation paths (such as frequency of increase and decrease, usage time), combined with cluster analysis to identify typical usage patterns (such as frequent short distances vs. occasional long distances), and establish a usage cycle distribution model.

[0055] S5 is the step for establishing an accelerated test method based on comprehensive stress; Throughout their lifecycle, automotive systems are subject to a variety of stresses, such as temperature, humidity, vibration, and shock. Different stresses can lead to different failures or impacts on automotive system reliability. Designing appropriate accelerated testing methods to stimulate potential defects during the automotive system development and verification phase is crucial.

[0056] The path to establish accelerated test methods for automotive systems is as follows: Figure 8 As shown, it includes: stress analysis identification, acceleration model selection, automobile system usage time determination, acceleration factor determination, and acceleration test cycle calculation; The following uses the window lift system as an example to illustrate the development of an accelerated test method based on comprehensive stress: S5.1, Identification Steps for Stress Analysis; Analysis shows that window lift systems are primarily affected by environmental factors throughout their lifecycle, including temperature, humidity, vibration, shock, dust, rain, sunlight, and electromagnetic interference. The following example uses the determination of the acceleration factor for a high-temperature test.

[0057] S5.2, the selection step of the acceleration model; For high temperature accelerated tests, the widely used Arrhenius model is selected, namely: AF=exp{(Ea / k)·[(1 / T u )-(1 / T t )]} Where: K is the Boltzmann constant, K=8.617385*10 -5 ;E a is the activation energy, with a value range of (0.3-1.2); T U is the operating temperature; T t is the test temperature; AF: temperature acceleration factor; Among them, in high-temperature accelerated tests, the Arrhenius model is one of the most widely used mathematical models in reliability engineering. Its core logic is to simulate the long-term use environment through temperature stress and quickly predict the life and reliability of the product under normal stress.

[0058] By analyzing the operating environment of the window lift system throughout its lifecycle, the average summer operating temperature is 28°C. Based on engineering experience, the high-temperature test temperature is proposed to be 80°C, with an Ea value of 0.5. Using the Arrhenius model, the acceleration factor is 17.10886277. Based on a 10-year automotive system lifecycle, the summer operating time is t1 = 10 * 90 * 24 * 0.5 = 10,800 hours, and the high-temperature test time is t2 = 10,800 / 17.10886277 = 631.2518 hours, where h represents hours.

[0059] For other stresses, select the corresponding mature acceleration model. For example, the humidity acceleration model selects the Peck model, and the formula is: AF=(RH S / RH U ) n *exp{(Ea / k)·[(1 / T u )-(1 / T t )]} RH S is the relative humidity value of applied stress; RH u It is the relative humidity value under normal use conditions; The vibration acceleration model selects the inverse power law model: T s / T t =(A t / A s ) m T s The time is during normal use; T t is the test time; A t is the root mean square value of vibration acceleration during normal use; A s is the root mean square value of the vibration acceleration of the test; M is the material fatigue index.

[0060] S5.3, Steps for determining the sample size for automotive system reliability testing; The selection of sample size for automobile system reliability test is related to the reliability requirements of the automobile system. At the same time, the sample size determines the reliability test cycle multiples.

[0061] This embodiment uses the Bogey test model to calculate the number of accelerated test cycles. The Bogey test model determines the number of test cycles based on the number of samples under given reliability and confidence levels: N=ln(1-C) / lnR×α×β Where: N is the number of samples; C is the confidence level; R is the reliability; α is the life multiple; β is the shape parameter, which is selected in combination with the reliability design level of the automobile system.

[0062] Taking the window lift system as an example, assuming that users use it 10,000 times in 10 years, the automotive system reliability requirements are R=98% and C=50%; Considering the design capability and level of the automotive system, β=2 is selected. Calculated by the Bogey model, α=2.2; Therefore, the window lift reliability cycle count is 10,000*2.2=22,000. At the same time, the Bogey test model shows that N is 8, which means the sample size is 8.

[0063] Among them, the Bogey test model is a verification process based on a standard experimental framework. Its core logic is to ensure that the performance, structural strength and reliability of the design scheme in the accelerated test meet the expected goals through quantitative comparison and boundary constraints.

[0064] In accelerated fatigue testing of automotive suspension components, the Bogey test model is used to determine the "Bogey limit" (the fatigue endurance limit under a design load). By performing constant-amplitude sinusoidal loading tests, the number of load cycles required for component failure is recorded and used as a reference for comparison with new design proposals. This method helps optimize designs and improve component fatigue durability and reliability.

[0065] As a preferred solution, the present invention can also adopt the following optimized solution: accelerated testing and specification establishment, based on the comprehensive stress impact results (such as vibration causing a 30% decrease in motor life), using highly accelerated stress testing (HAST) to stimulate potential defects, and locating weak links through failure mode analysis (FTA), and finally forming a test specification including stress thresholds and test cycles.

[0066] S6, the steps of analyzing and determining the subjective evaluation and objective measurement items based on the user's full-dimensional strong perception (seeing / hearing / touching / speaking, etc.); how to formulate subjective evaluation and objective measurement items from the perspective of the user's full-dimensional perception is the key to determining the evaluation content before, during, and after the automotive system reliability test.

[0067] Taking the window lift system as an example, the following determines the subjective evaluation and objective measurement items based on the user's full-dimensional perception needs.

[0068] Table 3 Analysis of subjective evaluation and objective measurement items of users’ strong perception in all dimensions

[0069] Relationship between subjective evaluation and objective measurement: There is a certain correlation between subjective evaluation and objective measurement data. Therefore, it is necessary to analyze the correlation between the two so that the requirements of both are consistent with the user's perception.

[0070] The following analysis is based on the window rising speed as an example: Five randomly selected evaluators were asked to rate their subjective feelings at different window-raising speeds. The window-raising speed was also objectively measured, with the speed range set between 20 and 200 mm / s. Evaluations were made at 20 mm / s intervals. Subjective evaluations were divided into five levels: "very slow," "slow," "moderate," "fast," and "very fast." The statistical data and analysis are as follows: Table 4 Analysis of subjective evaluation and objective measurement data of window rising speed

[0071] The table above shows that the majority of respondents consider window-rising speeds within the 80-120 mm / s range to be moderate, followed by 60 / 140 mm, while all other speeds are considered unacceptable. Therefore, 80-120 mm / s is the ideal range for objective window-rising speed measurement.

[0072] The automobile system described in the present invention refers to an automobile system that is affected by environmental stress. The method can be applied to all automobile systems that are affected by environmental stress (including but not limited to the specific automobile systems given in the above embodiments).

[0073] A second object of the present invention is to provide a system for establishing automotive system reliability test specifications, comprising: Select the unit, select the automotive system for which reliability test specifications are to be established, and conduct tests based on the test unit. Figure 9 As a schematic diagram, the test unit includes: The composition and structure analysis module 100 is used to determine the object and scope of the automobile system reliability test through the reliability block diagram analysis method, and perform automobile system composition and structure analysis based on the object and scope of the automobile system reliability test; Function and performance analysis module 200, for performing automobile system function and performance analysis on the object and scope of automobile system reliability test based on the results of automobile system composition and structure analysis; The full lifecycle simulation module 300 is used to simulate the environmental stresses, user environments, and user scenarios to which the vehicle system is subjected during storage, transportation, and service, based on the analysis of the vehicle system's functions and performance. The module also accelerates the test within a set test cycle to obtain the reliability risks of the vehicle system. Based on the reliability risk analysis of the vehicle system, the module completes the environmental stresses, user profiles, and scenarios of the vehicle system throughout its lifecycle. The usage data analysis module 400 is used to analyze the user's usage data during the automobile system usage phase to determine the user's usage cycle distribution of the automobile system; The accelerated testing module 500 is used to identify the comprehensive stress impact of stress on the reliability of the automotive system using accelerated testing methods based on the analysis of environmental stress, user profiles and scenarios throughout the entire life cycle of the automotive system and the determination of the user's usage cycle distribution of the automotive system; Establish a unit for the test process and analysis of the test unit and establish reliability test specifications for automotive systems.

[0074] The automotive system is based on the above-mentioned automotive system reliability test specification establishment method.

[0075] In the above scheme, the selection unit and the testing unit work together. The selection unit is responsible for selecting the automotive systems for which reliability test specifications are to be established and initiating the relevant tests in the testing unit. This is the starting point of the entire process, ensuring the targeted and purposeful nature of the tests. The composition and structure analysis module 100 uses reliability block diagram analysis to determine the target and scope of the automotive system reliability test. This step provides a basic framework for subsequent functional and performance analysis, ensuring comprehensiveness and accuracy. Based on the results of the composition and structure analysis, the functional and performance analysis module 200 further conducts functional and performance analysis of the automotive system. This helps to gain a deeper understanding of the actual operating capabilities and performance characteristics of the automotive system, providing a basis for subsequent environmental stress simulation and accelerated testing. The full life simulation module 300 simulates the environmental stresses, user usage environments, and user scenarios to which the automotive system is subjected during storage, transportation, and service, and performs accelerated testing within a set test cycle. This step, by simulating actual usage conditions, predicts the reliability risks of the automotive system under different environments, providing an important reference for the development of test specifications. The usage data analysis module 400 analyzes user usage data during the vehicle system's usage phase to determine the distribution of user usage cycles for the vehicle system. This helps understand actual user habits and provides more realistic data support for accelerated testing. Accelerated Testing Module 500: Based on the analysis of environmental stresses, user profiles and scenarios throughout the entire lifecycle, and the determination of user usage cycle distribution, accelerated testing methods are used to identify the comprehensive stress impacts on vehicle system reliability. This step uses accelerated testing to rapidly assess vehicle system reliability, providing a scientific basis for developing test specifications. Establish Unit: Based on the test process and analysis results of the test unit, the reliability test specifications for the vehicle system are established.

[0076] The system comprehensively analyzes the vehicle system's composition and structure, functions and performance, lifecycle environmental stress simulation, user data analysis, and accelerated testing, ensuring the comprehensiveness and accuracy of test specifications. Using scientific methods such as reliability block diagram analysis and accelerated testing, the system conducts in-depth analysis and evaluation of vehicle systems, ensuring the scientific and reliable nature of the test specifications. Closely integrating the system's actual usage, the system simulates actual operating conditions and user habits to develop more realistic test specifications, enhancing the practicality and effectiveness of testing. Accelerated testing methods enable rapid assessment of vehicle system reliability, shortening testing cycles and improving test efficiency.

[0077] Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for establishing automobile system reliability test specifications, characterized in that: include: Select the automotive system for which reliability test specifications are to be established and conduct the following tests: S1, determine the object and scope of the automobile system reliability test through the reliability block diagram analysis method, and conduct automobile system composition and structure analysis based on the object and scope of the automobile system reliability test; S2, based on the results of the automobile system composition and structure analysis, conduct automobile system function and performance analysis on the object and scope of automobile system reliability test; S3, based on the analysis of the vehicle system's functions and performance, simulates the environmental stresses, user environments, and user scenarios to which the vehicle system is subjected during storage, transportation, and service. Acceleration is performed within a set test cycle to obtain the reliability risk of the vehicle system. Based on the reliability risk analysis of the vehicle system, the environmental stresses, user profiles, and scenarios throughout the vehicle system's life cycle are completed. S4, during the automobile system usage phase, analyzing the user's usage data to determine the user's cyclic distribution of automobile system usage; S5, based on the analysis of environmental stress, user profiles and scenarios throughout the entire life cycle of the automotive system and the determination of the user's usage cycle distribution of the automotive system, uses accelerated testing methods to identify the comprehensive stress impact results of stress on the reliability of the automotive system; By analyzing the test process and analysis of S1~S5, the reliability test specifications of the automobile system are established.

2. The method for establishing automobile system reliability test specifications according to claim 1, characterized in that: The objects and scope of the automobile system reliability test are determined, including the key connections and interaction parts of the automobile system.

3. The method for establishing automobile system reliability test specifications according to claim 1, characterized in that: The automobile system composition and structure analysis includes one or more of the following: the composition and connection relationship within the automobile system, the automobile system boundary components that have a significant impact on the reliability of the automobile system, and the impact of the boundary automobile system; The composition and connection relationship of the automobile system includes at least one or more of hardware connection, software communication and control, among which the hardware connection includes one or more of bolt connection, riveting, welding, pressing, hemming and wiring harness, and the software communication and control includes at least one or more of input information flow and output control command.

4. The method for establishing automobile system reliability test specifications according to claim 1, characterized in that: The analysis of the automotive system composition and structure adopts the reliability block diagram method, which specifically includes: First, distinguish the critical / non-critical components in the composition of the automobile system that affect the reliability of the automobile system, and secondly distinguish the importance of various connection relationships.

5. The method for establishing automobile system reliability test specifications according to claim 1, characterized in that: The object and scope of the automobile system reliability test are analyzed to determine the functions and performance of the automobile system, including whether the functions have failed and whether the performance has declined.

6. The method for establishing automobile system reliability test specifications according to claim 1, characterized in that: In the analysis of the functions and performance of the automobile system on the objects and scope of the automobile system reliability test, the functions and performance of the automobile system are defined using a full matrix analysis method with multiple dimensions, including: the requirements of market laws and regulations, the needs of users for automobile systems, the demand for products that surpass competitors, the requirements of the professional development plan of the automobile system, and the creative functions and performance of the automobile system.

7. The method for establishing automobile system reliability test specifications according to claim 1, characterized in that: The simulated environmental stresses, user usage environments and user scenarios to which the automobile system is subjected during storage, transportation and service refer to the factors that directly affect the reliability of the automobile system in the user usage scenarios, user usage profiles and environmental stresses during the entire life cycle of the automobile system, from vehicle transportation, storage, user use to vehicle scrapping, after the automobile system is completed and assembled on the vehicle. All influencing factors are analyzed and identified during the automobile system reliability analysis process and incorporated into the test specifications.

8. The method for establishing automobile system reliability test specifications according to claim 1, characterized in that: During the automobile system usage phase, analyzing the user's usage data to determine the user's cyclic distribution of automobile system usage includes: Based on user usage data and combined with the car system startup strategy, the distribution of the number of times the car system is turned on is analyzed, and then the probability density distribution of the startup data is obtained. Based on the probability density distribution of the startup data, the cyclic distribution of the user's use of the car system is determined.

9. The method for establishing automobile system reliability test specifications according to claim 1, characterized in that: The results of using the accelerated test method to identify the comprehensive stress impact of stress on the reliability of the automobile system include: The accelerated test method includes: stress analysis and identification, selecting an acceleration model based on the identification results, determining the sample size for the vehicle system reliability test, and then determining the vehicle system usage time, acceleration factor, and accelerated test cycle based on the acceleration model, and finally completing the accelerated test; Among them, stress analysis identification is to determine the environmental factors that are affected during the entire life cycle of the automotive system; the automotive system is affected by various stresses during its entire life cycle. Different stresses will cause different failures / malfunctions or impacts on the reliability of the automotive system, and the comprehensive stress impact results can be obtained by identification.

10. The method for establishing automobile system reliability test specifications according to claim 9, characterized in that: Determining the sample size for automobile system reliability testing includes: The Bogey test model is used to calculate the number of accelerated test cycles to ensure that the number of test cycles meets the following requirements: N=ln(1-C) / lnR×α×β Where: N is the number of samples; C is the confidence level; R is the reliability; α is the life multiple; β is the shape parameter, which is selected in combination with the reliability design level of the automobile system.

11. The method for establishing automobile system reliability test specifications according to claim 1, characterized in that: By analyzing the test process and analysis of S1 to S5, the reliability test specifications of the automotive system are established, including: The correlation between subjective evaluation and objective measurement is analyzed to ensure that the requirements of both are consistent with user perception. Based on the analysis of the user's full-dimensional, strongly perceived subjective evaluation and objective measurement items, the evaluation content before, during, and after the automotive system reliability test is determined to obtain the final automotive system reliability test specifications.

12. A system for establishing automobile system reliability test specifications, characterized in that: include: Select a unit, select an automotive system for which reliability test specifications are to be established, and conduct a test based on the test unit, wherein the test unit includes: The composition and structure analysis module is used to determine the object and scope of the automobile system reliability test through the reliability block diagram analysis method, and to perform automobile system composition and structure analysis based on the object and scope of the automobile system reliability test; Function and performance analysis module, used to analyze the function and performance of the automobile system based on the results of automobile system composition and structure analysis and the object and scope of automobile system reliability test; The full life cycle simulation module is used to simulate the environmental stress, user environment, and user scenarios to which the vehicle system is subjected during storage, transportation, and service, based on the analysis of the vehicle system's functions and performance. The module also accelerates the test within a set test cycle to obtain the reliability risk of the vehicle system. Based on the reliability risk analysis of the vehicle system, the module completes the environmental stress, user profile, and scenarios of the vehicle system throughout its life cycle. A usage data analysis module is used to analyze the user's usage data during the vehicle system usage phase and determine the user's cyclic distribution of vehicle system usage; The accelerated testing module is used to identify the comprehensive stress impacts on the reliability of the automotive system using accelerated testing methods based on the analysis of environmental stresses, user profiles and scenarios throughout the entire life cycle of the automotive system and the determination of the user's usage cycle distribution of the automotive system; Establish a unit for the test process and analysis of the test unit and establish reliability test specifications for automotive systems.

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