Engine pedestal endurance test evaluation method, device, system and medium

Abstract

The invention provides an engine pedestal endurance test evaluation method, device and system and a medium. According to the preset test confidence coefficient in the current failure mode, the test number of the current to-be-repaired parts of the rack durability test engine in the current failure mode and the shape parameters of the current to-be-repaired parts of the rack durability test engine in the current failure mode, determining the failure mode of the rack durability test engine; calculating to obtain a reliability prediction value of the current to-be-repaired part of the customer vehicle engine in the current failure mode according to the accumulated damage of the current to-be-repaired part of the customer vehicle engine in the current failure mode and the accumulated damage of the current to-be-repaired part of the rack endurance test engine in the current failure mode; and when the predicted value is consistent with the target value, judging that the test method is reasonable. Through the pre-trained engine damage model, the engine damage can be accurately and quickly obtained, the rack endurance test is associated with the customer vehicle, the rack endurance test assessment is prevented from being out of practice, and the engine rack endurance test is accurately evaluated by calculating the predicted value.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an engine bench durability test evaluation method, device, system and medium. Background Art

[0002] Engine bench durability test is the main means of verifying engine durability and reliability. Automobile engines generally use B10 life as a reliability indicator, that is, when the vehicle's driving life / mileage reaches B10 life / mileage, it is expected that 10% of the engines will fail and require overhaul. In order to ensure that automobile engines can achieve the B10 life target after they are launched on the market, multi-sample bench durability tests must be conducted in the early stages of engine development.

[0003] At present, most of the engine bench durability test specifications of various manufacturers are derived from the national standard GB / T19055-2003 "Automobile Engine Reliability Test Methods". This standard stipulates the general reliability test methods for automobile engines on the bench, including load test specifications (such as alternating load, mixed load and full speed and full load), hot and cold shock test specifications, and gives the engine bench durability test conditions and test time, but does not specify the test sample size and the reliability indicators that the engine can reach after passing the bench durability test assessment, which makes it easy for over-assessment or under-assessment to occur.

[0004] Therefore, how to accurately evaluate the engine bench durability test so as to make targeted adjustments to the engine bench durability test later is a technical problem that needs to be solved in this field. Summary of the invention

[0005] In view of this, this summary of the invention is provided to introduce the concepts in a brief form, which will be described in detail in the detailed description section below. This summary of the invention is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to be used to limit the scope of the technical solution claimed for protection.

[0006] The purpose of the present application is to provide an engine bench durability test evaluation method, device, system and medium, which can accurately evaluate the engine bench durability test so as to make targeted adjustments to the engine bench durability test later.

[0007] To achieve the above purpose, this application has the following technical solutions:

[0008] In a first aspect, an embodiment of the present application provides an engine bench durability test evaluation method, comprising:

[0009] Collect the parameters of the current parts to be repaired in the customer vehicle engine under the current failure mode, the running time of the current parts to be repaired in the customer vehicle engine under the current failure mode, the parameters of the current parts to be repaired in the bench durability test engine under the current failure mode, and the test time of the current parts to be repaired in the bench durability test engine under the current failure mode;

[0010] Input the parameters of the current to-be-repaired parts of the customer vehicle engine under the current failure mode and the running time of the current to-be-repaired parts of the customer vehicle engine under the current failure mode into the pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired parts of the customer vehicle engine under the current failure mode;

[0011] Input the parameters of the current to-be-repaired parts of the engine under the bench durability test in the current failure mode and the test duration of the current to-be-repaired parts of the engine under the bench durability test in the current failure mode into the pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired parts of the engine under the bench durability test in the current failure mode;

[0012] Calculate the reliability prediction value of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode according to the preset test confidence level under the current failure mode, the number of tests on the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the accumulated damage of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode, and the accumulated damage of the current to-be-repaired part of the engine of the bench durability test under the current failure mode;

[0013] When the predicted reliability value of the current parts to be repaired of the customer vehicle engine under the current failure mode is consistent with the preset reliability target value of the current parts to be repaired of the customer vehicle engine under the current failure mode, it is determined that the bench durability test method of the current parts to be repaired of the engine under the current failure mode is reasonable.

[0014] In a possible implementation, the reliability prediction value of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode is calculated based on the preset test confidence in the current failure mode, the number of tests on the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the accumulated damage of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode, and the accumulated damage of the current to-be-repaired part of the engine of the bench durability test under the current failure mode, including:

[0015]

[0016]

[0017] Wherein, CL is the preset test confidence under the current failure mode, X is the number of tests on the current parts to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current parts to be repaired in the bench durability test engine under the current failure mode, and D customer ij D is the cumulative damage of the parts to be repaired in the customer vehicle engine under the current failure mode, test ij AF is the cumulative damage of the current parts to be repaired in the bench durability test engine under the current failure mode. ij It is the acceleration factor of the bench durability test of the current component to be repaired under the current failure mode relative to the B10 life mileage of the customer vehicle.

[0018] In a possible implementation, the preset reliability target value of the current to-be-repaired component of the customer vehicle engine in the current failure mode is calculated by the following formula:

[0019]

[0020] in, A reliability target value is preset for the current to-be-repaired component of the customer vehicle engine under the current failure mode, N is the number of to-be-repaired components of the customer vehicle engine, and M is the number of failure modes corresponding to each to-be-repaired component of the customer vehicle engine.

[0021] In a possible implementation, the parameters of the current to-be-repaired component of the customer vehicle engine in the current failure mode include: material constants of the current to-be-repaired component of the customer vehicle engine in the current failure mode, engine speed of the customer vehicle in the current failure mode, and engine torque of the customer vehicle in the current failure mode.

[0022] In a second aspect, an embodiment of the present application provides an engine bench durability test evaluation device, comprising:

[0023] A collection unit is used to collect parameters of the current to-be-repaired parts of the customer vehicle engine under the current failure mode, the running time of the current to-be-repaired parts of the customer vehicle engine under the current failure mode, parameters of the current to-be-repaired parts of the bench durability test engine under the current failure mode, and the test time of the current to-be-repaired parts of the bench durability test engine under the current failure mode;

[0024] The first input unit is used to input the parameters of the current to-be-repaired component of the customer vehicle engine under the current failure mode and the running time of the current to-be-repaired component of the customer vehicle engine under the current failure mode into a pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired component of the customer vehicle engine under the current failure mode;

[0025] The second input unit is used to input the parameters of the current to-be-repaired parts of the bench durability test engine under the current failure mode and the test duration of the current to-be-repaired parts of the bench durability test engine under the current failure mode into the pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired parts of the bench durability test engine under the current failure mode;

[0026] The first calculation unit is used to calculate the reliability prediction value of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode according to the preset test confidence in the current failure mode, the number of tests on the current to-be-repaired component of the engine of the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired component of the engine of the bench durability test under the current failure mode, the accumulated damage of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode, and the accumulated damage of the current to-be-repaired component of the engine of the bench durability test under the current failure mode;

[0027] The determination unit is used to determine that when the reliability prediction value of the current parts to be repaired of the customer vehicle engine under the current failure mode is consistent with the preset reliability target value of the current parts to be repaired of the customer vehicle engine under the current failure mode, then it is determined that the bench durability test method of the current parts to be repaired of the engine under the current failure mode is reasonable.

[0028] In a possible implementation manner, the first computing unit is specifically configured to:

[0029]

[0030]

[0031] Wherein, CL is the preset test confidence under the current failure mode, X is the number of tests on the current parts to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current parts to be repaired in the bench durability test engine under the current failure mode, and D customer ij D is the cumulative damage of the parts to be repaired in the customer vehicle engine under the current failure mode, test ij AF is the cumulative damage of the current parts to be repaired in the bench durability test engine under the current failure mode. ij It is the acceleration factor of the bench durability test of the current component to be repaired under the current failure mode relative to the B10 life mileage of the customer vehicle.

[0032] In a possible implementation, the method further includes:

[0033] The second calculation unit is used to preset the reliability target value of the current repaired component of the customer vehicle engine under the current failure mode. in, A reliability target value is preset for the current to-be-repaired component of the customer vehicle engine under the current failure mode, N is the number of to-be-repaired components of the customer vehicle engine, and M is the number of failure modes corresponding to each to-be-repaired component of the customer vehicle engine.

[0034] In a possible implementation, the parameters of the current to-be-repaired component of the customer vehicle engine in the current failure mode include: material constants of the current to-be-repaired component of the customer vehicle engine in the current failure mode, engine speed of the customer vehicle in the current failure mode, and engine torque of the customer vehicle in the current failure mode.

[0035] In a third aspect, an embodiment of the present application provides an engine bench durability test evaluation system, comprising:

[0036] Memory for storing computer programs;

[0037] A processor is used to implement the steps of the engine bench durability test evaluation method as described above when executing the computer program.

[0038] In a fourth aspect, an embodiment of the present application provides a computer-readable medium having a computer program stored thereon, and when the computer program is processed and executed, the steps of the engine bench durability test evaluation method as described above are implemented.

[0039] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0040] The embodiment of the present application provides an engine bench durability test evaluation method, device, system and medium, the method comprising: collecting parameters of current to-be-repaired parts of a customer vehicle engine under a current failure mode, operating time of current to-be-repaired parts of the customer vehicle engine under a current failure mode, parameters of current to-be-repaired parts of a bench durability test engine under a current failure mode and test time of current to-be-repaired parts of a bench durability test engine under a current failure mode; inputting parameters of current to-be-repaired parts of a customer vehicle engine under a current failure mode and operating time of current to-be-repaired parts of a customer vehicle engine under a current failure mode into a pre-trained engine damage model, obtaining accumulated damage of current to-be-repaired parts of a customer vehicle engine under a current failure mode; inputting parameters of current to-be-repaired parts of a bench durability test engine under a current failure mode and test time of current to-be-repaired parts of a bench durability test ... The pre-trained engine damage model is input to obtain the cumulative damage of the current parts to be repaired of the engine under the bench durability test in the current failure mode; according to the preset test confidence in the current failure mode, the number of tests of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the shape parameters of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the cumulative damage of the current parts to be repaired of the engine of the customer vehicle in the current failure mode, and the cumulative damage of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the reliability prediction value of the current parts to be repaired of the engine of the customer vehicle in the current failure mode is calculated; when the reliability prediction value of the current parts to be repaired of the engine of the customer vehicle in the current failure mode is consistent with the preset reliability target value of the current parts to be repaired of the engine of the customer vehicle in the current failure mode, it is determined that the bench durability test method of the current parts to be repaired of the engine in the current failure mode is reasonable. The present application can accurately and quickly obtain engine damage through the pre-trained engine damage model, and associate the bench durability test with the customer vehicle to avoid the bench durability test assessment being out of touch with reality. Through the calculated prediction value, the engine bench durability test is accurately evaluated so as to make targeted adjustments to the engine bench durability test later. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0043] Figure 1 A flow chart of an engine bench durability test evaluation method provided by an embodiment of the present application is shown;

[0044] Figure 2 A schematic diagram of an engine bench durability test evaluation device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0047] As described in the background technology, the applicant has found that the engine bench durability test is the main means of verifying the durability and reliability of the engine. Automobile engines generally use the B10 life as a reliability indicator, that is, when the vehicle's driving life / mileage reaches the B10 life / mileage, it is expected that 10% of the engines will fail and require overhaul. In order to ensure that the automobile engine can achieve the B10 life target after it is launched on the market, a multi-sample bench durability test should be carried out in the early stage of engine development.

[0048] At present, most of the engine bench durability test specifications of various manufacturers are derived from the national standard GB / T19055-2003 "Automobile Engine Reliability Test Methods". This standard stipulates the general reliability test methods for automobile engines on the bench, including load test specifications (such as alternating load, mixed load and full speed and full load), hot and cold shock test specifications, and gives the engine bench durability test conditions and test time, but does not specify the test sample size and the reliability indicators that the engine can reach after passing the bench durability test assessment, which makes it easy for over-assessment or under-assessment to occur.

[0049] Therefore, how to accurately evaluate the engine bench durability test so as to make targeted adjustments to the engine bench durability test later is a technical problem that needs to be solved in this field.

[0050] In order to solve the above technical problems, an embodiment of the present application provides an engine bench durability test evaluation method, device, system and medium, the method comprising: collecting parameters of current parts to be repaired of the engine of a customer vehicle under the current failure mode, the operating time of the current parts to be repaired of the engine of the customer vehicle under the current failure mode, parameters of current parts to be repaired of the engine of the bench durability test under the current failure mode and the test time of the current parts to be repaired of the engine of the bench durability test under the current failure mode; inputting the parameters of current parts to be repaired of the engine of the customer vehicle under the current failure mode and the operating time of the current parts to be repaired of the engine of the customer vehicle under the current failure mode into a pre-trained engine damage model to obtain the cumulative damage of the current parts to be repaired of the engine of the customer vehicle under the current failure mode; inputting the parameters of current parts to be repaired of the engine of the bench durability test under the current failure mode and the operating time of the current parts to be repaired of the engine of the bench durability test ... Test duration, input the pre-trained engine damage model, and obtain the cumulative damage of the current parts to be repaired of the engine under the bench durability test in the current failure mode; according to the preset test confidence in the current failure mode, the number of tests of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the shape parameters of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the cumulative damage of the current parts to be repaired of the engine of the customer vehicle in the current failure mode, and the cumulative damage of the current parts to be repaired of the engine under the bench durability test in the current failure mode, calculate the reliability prediction value of the current parts to be repaired of the engine of the customer vehicle in the current failure mode; when the reliability prediction value of the current parts to be repaired of the engine of the customer vehicle in the current failure mode is consistent with the preset reliability target value of the current parts to be repaired of the engine of the customer vehicle in the current failure mode, it is determined that the bench durability test method of the current parts to be repaired of the engine in the current failure mode is reasonable. This application can accurately and quickly obtain engine damage through the pre-trained engine damage model, and associate the bench durability test with the customer vehicle to avoid the bench durability test assessment from being out of touch with reality. Through the calculated prediction value, the engine bench durability test is accurately evaluated so that the engine bench durability test can be adjusted in a targeted manner later.

[0051] Exemplary Methods

[0052] See also Figure 1 FIG. 1 is a flow chart of an engine bench durability test evaluation method provided in an embodiment of the present application, comprising:

[0053] S101: Collecting parameters of the current parts to be repaired in the customer vehicle engine under the current failure mode, the running time of the current parts to be repaired in the customer vehicle engine under the current failure mode, parameters of the current parts to be repaired in the bench durability test engine under the current failure mode, and the test time of the current parts to be repaired in the bench durability test engine under the current failure mode.

[0054] S102: Input the parameters of the current to-be-repaired parts of the customer vehicle engine under the current failure mode and the running time of the current to-be-repaired parts of the customer vehicle engine under the current failure mode into a pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired parts of the customer vehicle engine under the current failure mode.

[0055] S103: Input the parameters of the current parts to be repaired of the bench durability test engine under the current failure mode and the test duration of the current parts to be repaired of the bench durability test engine under the current failure mode into the pre-trained engine damage model to obtain the accumulated damage of the current parts to be repaired of the bench durability test engine under the current failure mode.

[0056] In an embodiment of the present application, in order to facilitate the subsequent calculation of the cumulative damage of the customer vehicle and the bench durability test engine, it is first necessary to obtain the current parameters of the parts to be repaired of the customer vehicle engine under the current failure mode and the current parameters of the parts to be repaired of the bench durability test engine under the current failure mode.

[0057] For example, the main load factors of failure can be analyzed according to the failure mechanism of each failure mode. Taking the current failure mode as the high-cycle fatigue fracture of the connecting rod as an example, the current part to be repaired is the engine connecting rod. When the cylinder is in the compression and expansion stroke, the connecting rod is subjected to compressive stress. When the cylinder piston is near the top dead center of the exhaust stroke, the gas pressure in the cylinder is small and the piston acceleration is large. Under the action of the reciprocating inertia force of the piston, the connecting rod is subjected to tensile stress. The connecting rod will suffer fatigue damage under the action of this cyclic stress, and fatigue fracture will occur when the damage accumulates to a certain extent. According to Miner's linear cumulative damage theory, the amount of fatigue damage can be calculated from the stress amplitude, stress mean and stress cycle number, and the stress amplitude and stress mean are strongly related to the engine speed and torque, and the number of stress cycles is strongly related to the engine running time.

[0058] Therefore, the parameters of the current parts to be repaired in the customer vehicle engine under the current failure mode, the running time of the current parts to be repaired in the customer vehicle engine under the current failure mode, the parameters of the current parts to be repaired in the bench durability test engine under the current failure mode, and the test time of the current parts to be repaired in the bench durability test engine under the current failure mode can be collected.

[0059] Then, the embodiment of the present application can input the parameters of the current parts to be repaired in the customer vehicle engine under the current failure mode and the running time of the current parts to be repaired in the customer vehicle engine under the current failure mode into a pre-trained engine damage model to obtain the cumulative damage of the current parts to be repaired in the customer vehicle engine under the current failure mode.

[0060] Specifically, That is, in the embodiment of the present application, the accumulated damage D of the current to-be-repaired parts of the customer vehicle engine in the current failure mode is customer ij It can be calculated by the pre-trained engine damage model f, C1 is the material constant of the current repaired part of the customer vehicle engine under the current failure mode, n k is the engine speed of the customer vehicle in the current failure mode, M k is the engine torque of the customer vehicle in the current failure mode, t k is the operating time of the current component to be repaired in the customer vehicle engine under the current failure mode. k=1, 2...Q, where Q represents the number of operating condition segments of the current component to be repaired in the customer vehicle engine under the current failure mode.

[0061] at the same time, That is, in the embodiment of the present application, the cumulative damage D of the current to-be-repaired parts of the engine in the bench durability test under the current failure mode is test ij It can be calculated by the pre-trained engine damage model f, C2 is the material constant of the current part to be repaired in the bench durability test engine under the current failure mode, n p is the engine speed of the bench durability test in the current failure mode, M p is the engine torque of the bench durability test under the current failure mode, t p is the operating time of the current component to be repaired in the bench durability test engine under the current failure mode. p = 1, 2...O, O represents the number of operating condition segments of the current component to be repaired in the bench durability test engine under the current failure mode.

[0062] Therefore, the present application can realize the calculation of the cumulative damage of each component under each failure mode of the engine through the pre-trained engine damage model, and can accurately and quickly obtain the cumulative damage, improve efficiency and reduce labor costs.

[0063] Specifically, the pre-trained engine damage model can be trained through the following steps:

[0064] A training set of an initial engine damage model is obtained, wherein the training set includes: input elements and cumulative damage of known engine parts to be repaired under known failure modes; the input elements include: parameters of known engine parts to be repaired under known failure modes and test duration of known engine parts under known failure modes; the training set is used to learn a mapping relationship between input elements and cumulative damage of known engine parts to be repaired under known failure modes; model parameters of the initial engine damage model are determined according to the mapping relationship, so as to train and obtain a pre-trained engine damage model.

[0065] S104: Calculate the reliability prediction value of the current parts to be repaired of the engine of the customer vehicle under the current failure mode according to the preset test confidence level in the current failure mode, the number of tests on the current parts to be repaired of the engine under the bench durability test in the current failure mode, the shape parameters of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the accumulated damage of the current parts to be repaired of the engine of the customer vehicle under the current failure mode, and the accumulated damage of the current parts to be repaired of the engine under the bench durability test in the current failure mode.

[0066] S105: When the reliability prediction value of the current repaired parts of the customer vehicle engine under the current failure mode is consistent with the preset reliability target value of the current repaired parts of the customer vehicle engine under the current failure mode, it is determined that the bench durability test method of the current repaired parts of the engine under the current failure mode is reasonable.

[0067] In the embodiment of the present application, the bench durability test is reasonably associated with the customer vehicle to calculate the reliability prediction value, so as to avoid the bench durability test assessment being out of touch with reality.

[0068] Specifically, in a possible implementation, the embodiment of the present application provides a method for calculating the reliability prediction value of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode according to the preset test confidence in the current failure mode, the number of tests on the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the accumulated damage of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode, and the accumulated damage of the current to-be-repaired part of the engine of the bench durability test under the current failure mode, which may specifically include:

[0069]

[0070]

[0071] Among them, CL is the preset test confidence under the current failure mode, X is the number of tests on the current parts to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current parts to be repaired in the bench durability test engine under the current failure mode, and D customer ij D is the cumulative damage of the parts to be repaired in the customer vehicle engine under the current failure mode, test ij AF is the cumulative damage of the current parts to be repaired in the bench durability test engine under the current failure mode. ij It is the acceleration factor of the bench durability test of the current component to be repaired under the current failure mode relative to the B10 life mileage of the customer vehicle.

[0072] The engine bench durability test is a success test. The success test is carried out according to the test method required by the specification. The test is stopped when the test duration reaches the duration required by the test specification. For a success test, when the number of test samples is X, no failure mode FM occurs in X test samples until the test is completed. ij According to the Bayesian formula, for a single failure mode FM ij The engine reliability can reach

[0073] That is, in the embodiment of the present application, the reliability target value of the current repaired component of the bench durability test engine under the current failure mode can be

[0074] According to product reliability theory, the cumulative failure probability of a product F(t) obeys the two-parameter Weibull distribution: η represents the scale parameter, β is the shape parameter of the current part to be repaired in the bench durability test engine under the current failure mode. The shape parameter is generally taken based on experience. Usually, the automobile exhaust system takes 3.0, the body takes 2.5, the suspension takes 2.03, and 1.5 is taken when there is no experience. t represents the working time of the product.

[0075] Given the cumulative failure probability of a product, the product reliability R(t) can be calculated according to the formula calculate.

[0076] According to the above current failure mode, the acceleration factor AF of the bench durability test of the current repaired component relative to the B10 life mileage of the customer vehicle ij The calculation formula is as follows: Assuming that the total duration of the engine bench endurance test is T, the duration of the customer vehicle's B10 life mileage equivalent bench endurance test is T / AF ij , and the two time lengths are brought in to obtain the reliability target values ​​of the current repaired parts of the engine under the bench durability test in the current failure mode. And the reliability prediction value of the current repair parts of the customer vehicle engine under the current failure mode

[0077]

[0078]

[0079] From formula (1) and (2), we can derive the formula (3) Substituting into formula (3), we can get

[0080] Therefore, the reliability prediction value of the current parts to be repaired of the engine of the customer vehicle under the current failure mode can be calculated based on the preset test confidence level in the current failure mode, the number of tests on the current parts to be repaired of the engine under the bench durability test under the current failure mode, the shape parameters of the current parts to be repaired of the engine under the bench durability test under the current failure mode, the cumulative damage of the current parts to be repaired of the engine under the bench durability test under the current failure mode, and the cumulative damage of the current parts to be repaired of the engine under the bench durability test under the current failure mode.

[0081] When the reliability prediction value of the current repaired parts of the customer vehicle engine under the current failure mode is consistent with the preset reliability target value of the current repaired parts of the customer vehicle engine under the current failure mode, It is determined that the bench durability test method for the engine parts to be repaired under the current failure mode is reasonable.

[0082] Optionally, if the predicted reliability value of the current parts to be repaired of the customer vehicle engine under the current failure mode is slightly greater than the preset reliability target value of the current parts to be repaired of the customer vehicle engine under the current failure mode, it can also be considered that the bench durability test method of the current parts to be repaired of the engine under the current failure mode is reasonable.

[0083] if This indicates that the engine bench durability test has been over-evaluated for the current failure mode; if This indicates that the engine bench durability test is insufficient in terms of the current failure mode.

[0084] In the embodiment of the present application, when the engine bench durability test is over-assessed or the engine bench durability test is under-assessed, the operating conditions, duration and number of samples of the engine bench durability test specifications can be adjusted in a targeted manner.

[0085] In a possible implementation, the preset reliability target value of the current repaired component of the customer vehicle engine under the current failure mode provided in the embodiment of the present application can be calculated by the following formula:

[0086]

[0087] in, The reliability target value is preset for the current repaired parts of the customer vehicle engine under the current failure mode, N is the number of repaired parts of the customer vehicle engine, and M is the number of failure modes corresponding to each repaired part of the customer vehicle engine. Different parts have different failure modes and different numbers of failure modes.

[0088] That is, in the embodiment of the present application, based on the product reliability theory, assuming that the reliability target setting B10 life of the engine is 10 years / 240,000 kilometers, then when the vehicle life reaches 10 years or the mileage reaches 240,000 kilometers, 10% of the engines will fail and need to be overhauled, that is, the reliability of the engine corresponding to 10 years / 240,000 kilometers is 90%. The preset reliability target value of the current repaired parts of the customer vehicle engine under the current failure mode is the reliability target value corresponding to 10 years and 240,000 kilometers.

[0089] Optionally, the current failure mode provided by the embodiment of the present application may include low-cycle fatigue cracking of the cylinder head, high-cycle fatigue fracture of the crankshaft, or valve guide wear.

[0090] The current failure mode of the embodiment of the present application can be combined with part FMEA (Failure Mode and Effects Analysis), design risks, historical failures and expert experience to perform failure mode analysis on all engine overhaul parts one by one to identify the key failure modes corresponding to each major overhaul part.

[0091] The embodiment of the present application provides an engine bench durability test evaluation method, the method comprising: collecting parameters of current to-be-repaired parts of a customer vehicle engine under a current failure mode, operating time of current to-be-repaired parts of the customer vehicle engine under a current failure mode, parameters of current to-be-repaired parts of a bench durability test engine under a current failure mode, and test time of current to-be-repaired parts of a bench durability test engine under a current failure mode; inputting the parameters of current to-be-repaired parts of the customer vehicle engine under a current failure mode and the operating time of current to-be-repaired parts of the customer vehicle engine under a current failure mode into a pre-trained engine damage model to obtain accumulated damage of current to-be-repaired parts of the customer vehicle engine under a current failure mode; inputting the parameters of current to-be-repaired parts of a bench durability test engine under a current failure mode and the test time of current to-be-repaired parts of a bench durability test engine under a current failure mode into a pre-trained engine damage model to obtain accumulated damage of current to-be-repaired parts of a customer vehicle engine under a current failure mode; The engine damage model is used to obtain the cumulative damage of the current parts to be repaired of the engine under the bench durability test in the current failure mode; according to the preset test confidence in the current failure mode, the number of tests of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the shape parameters of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the cumulative damage of the current parts to be repaired of the engine under the customer vehicle in the current failure mode, and the cumulative damage of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the reliability prediction value of the current parts to be repaired of the engine under the customer vehicle in the current failure mode is calculated; when the reliability prediction value of the current parts to be repaired of the engine under the customer vehicle in the current failure mode is consistent with the preset reliability target value of the current parts to be repaired of the engine under the customer vehicle in the current failure mode, it is determined that the bench durability test method of the current parts to be repaired of the engine under the current failure mode is reasonable. The present application can accurately and quickly obtain the engine damage through the pre-trained engine damage model, and associate the bench durability test with the customer vehicle to avoid the bench durability test assessment being out of touch with reality. Through the calculated prediction value, the engine bench durability test is accurately evaluated so as to make targeted adjustments to the engine bench durability test later.

[0092] Exemplary Devices

[0093] See also Figure 2 FIG. 1 is a schematic diagram of an engine bench durability test evaluation device provided in an embodiment of the present application, comprising:

[0094] The collecting unit 201 is used to collect the parameters of the current to-be-repaired parts of the customer vehicle engine in the current failure mode, the running time of the current to-be-repaired parts of the customer vehicle engine in the current failure mode, the parameters of the current to-be-repaired parts of the bench durability test engine in the current failure mode, and the test time of the current to-be-repaired parts of the bench durability test engine in the current failure mode;

[0095] The first input unit 202 is used to input the parameters of the current to-be-repaired component of the customer vehicle engine under the current failure mode and the running time of the current to-be-repaired component of the customer vehicle engine under the current failure mode into a pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired component of the customer vehicle engine under the current failure mode;

[0096] The second input unit 203 is used to input the parameters of the current to-be-repaired component of the bench durability test engine under the current failure mode and the test duration of the current to-be-repaired component of the bench durability test engine under the current failure mode into the pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired component of the bench durability test engine under the current failure mode;

[0097] The first calculation unit 204 is used to calculate the reliability prediction value of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode according to the preset test confidence in the current failure mode, the number of tests on the current to-be-repaired component of the engine of the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired component of the engine of the bench durability test under the current failure mode, the accumulated damage of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode, and the accumulated damage of the current to-be-repaired component of the engine of the bench durability test under the current failure mode;

[0098] The determination unit 205 is used to determine that when the reliability prediction value of the current parts to be repaired of the customer vehicle engine under the current failure mode is consistent with the preset reliability target value of the current parts to be repaired of the customer vehicle engine under the current failure mode, then it is determined that the bench durability test method of the current parts to be repaired of the engine under the current failure mode is reasonable.

[0099] In a possible implementation manner, the first computing unit is specifically configured to:

[0100]

[0101]

[0102] Wherein, CL is the preset test confidence under the current failure mode, X is the number of tests on the current parts to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current parts to be repaired in the bench durability test engine under the current failure mode, and D customer ij D is the cumulative damage of the parts to be repaired in the customer vehicle engine under the current failure mode, test ij AF is the cumulative damage of the current parts to be repaired in the bench durability test engine under the current failure mode. ij It is the acceleration factor of the bench durability test of the current component to be repaired under the current failure mode relative to the B10 life mileage of the customer vehicle.

[0103] In a possible implementation, the method further includes:

[0104] The second calculation unit is used to preset the reliability target value of the current repaired component of the customer vehicle engine under the current failure mode. in, A reliability target value is preset for the current to-be-repaired component of the customer vehicle engine under the current failure mode, N is the number of to-be-repaired components of the customer vehicle engine, and M is the number of failure modes corresponding to each to-be-repaired component of the customer vehicle engine.

[0105] In a possible implementation, the parameters of the current to-be-repaired component of the customer vehicle engine in the current failure mode include: material constants of the current to-be-repaired component of the customer vehicle engine in the current failure mode, engine speed of the customer vehicle in the current failure mode, and engine torque of the customer vehicle in the current failure mode.

[0106] The embodiment of the present application provides an engine bench durability test evaluation device, and the method applied to the device includes: collecting parameters of current parts to be repaired of the engine of the customer vehicle under the current failure mode, the operating time of the current parts to be repaired of the engine of the customer vehicle under the current failure mode, parameters of current parts to be repaired of the engine of the bench durability test under the current failure mode, and the test time of the current parts to be repaired of the engine of the bench durability test under the current failure mode; inputting the parameters of the current parts to be repaired of the engine of the customer vehicle under the current failure mode and the operating time of the current parts to be repaired of the engine of the customer vehicle under the current failure mode into a pre-trained engine damage model to obtain the accumulated damage of the current parts to be repaired of the engine of the customer vehicle under the current failure mode; inputting the parameters of the current parts to be repaired of the engine of the bench durability test under the current failure mode and the test time of the current parts to be repaired of the engine of the bench durability test under the current failure mode into a pre-trained engine damage model to obtain the accumulated damage of the current parts to be repaired of the engine of the customer vehicle under the current failure mode; The engine damage model is trained first to obtain the cumulative damage of the current parts to be repaired of the engine under the bench durability test in the current failure mode; according to the preset test confidence in the current failure mode, the number of tests of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the shape parameters of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the cumulative damage of the current parts to be repaired of the engine under the customer vehicle in the current failure mode, and the cumulative damage of the current parts to be repaired of the engine under the bench durability test in the current failure mode, the reliability prediction value of the current parts to be repaired of the engine under the customer vehicle in the current failure mode is calculated; when the reliability prediction value of the current parts to be repaired of the engine under the customer vehicle in the current failure mode is consistent with the preset reliability target value of the current parts to be repaired of the engine under the customer vehicle in the current failure mode, it is determined that the bench durability test method of the current parts to be repaired of the engine under the current failure mode is reasonable. The present application can accurately and quickly obtain the engine damage through the pre-trained engine damage model, and associate the bench durability test with the customer vehicle to avoid the bench durability test assessment from being out of touch with reality. Through the calculated prediction value, the engine bench durability test is accurately evaluated so as to make targeted adjustments to the engine bench durability test later.

[0107] Based on the above embodiments, the present application provides an engine bench durability test evaluation system, including:

[0108] Memory for storing computer programs;

[0109] A processor is used to implement the steps of the above-mentioned engine bench durability test evaluation method when executing the computer program.

[0110] On the basis of the above-mentioned embodiment, the embodiment of the present application further provides a computer-readable medium, on which a computer program is stored, and when the computer program is processed and executed, the steps of the above-mentioned engine bench durability test evaluation method are implemented.

[0111] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0112] The computer-readable medium may be included in the system; or may exist independently without being assembled into the system.

[0113] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a non-transitory computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart.

[0114] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0115] The above is only a preferred implementation of the present application. Although the present application has been disclosed as a preferred embodiment, it is not intended to limit the present application. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of protection of the technical solution of the present application.

Claims

1. An engine bench durability test evaluation method, characterized in that: include: Collect the parameters of the current parts to be repaired in the customer vehicle engine under the current failure mode, the running time of the current parts to be repaired in the customer vehicle engine under the current failure mode, the parameters of the current parts to be repaired in the bench durability test engine under the current failure mode, and the test time of the current parts to be repaired in the bench durability test engine under the current failure mode; Input the parameters of the current to-be-repaired parts of the customer vehicle engine under the current failure mode and the running time of the current to-be-repaired parts of the customer vehicle engine under the current failure mode into the pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired parts of the customer vehicle engine under the current failure mode; Input the parameters of the current to-be-repaired parts of the engine under the bench durability test in the current failure mode and the test duration of the current to-be-repaired parts of the engine under the bench durability test in the current failure mode into the pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired parts of the engine under the bench durability test in the current failure mode; The reliability prediction value of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode is calculated according to the preset test confidence level under the current failure mode, the number of tests on the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the accumulated damage of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode, and the accumulated damage of the current to-be-repaired part of the engine of the bench durability test under the current failure mode; When the predicted reliability value of the current parts to be repaired of the customer vehicle engine under the current failure mode is consistent with the preset reliability target value of the current parts to be repaired of the customer vehicle engine under the current failure mode, it is determined that the bench durability test method of the current parts to be repaired of the engine under the current failure mode is reasonable.

2. The method according to claim 1, characterized in that The reliability prediction value of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode is calculated according to the preset test confidence in the current failure mode, the number of tests on the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired part of the engine of the bench durability test under the current failure mode, the accumulated damage of the current to-be-repaired part of the engine of the customer vehicle under the current failure mode, and the accumulated damage of the current to-be-repaired part of the engine of the bench durability test under the current failure mode. include: Wherein, CL is the preset test confidence under the current failure mode, X is the number of tests on the current parts to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current parts to be repaired in the bench durability test engine under the current failure mode, and D customer ij D is the cumulative damage of the parts to be repaired in the customer vehicle engine under the current failure mode, test ij AF is the cumulative damage of the current parts to be repaired in the bench durability test engine under the current failure mode. ij It is the acceleration factor of the bench durability test of the current component to be repaired under the current failure mode relative to the B10 life mileage of the customer vehicle.

3. The method according to claim 1, characterized in that The preset reliability target value of the current repaired component of the customer vehicle engine under the current failure mode is calculated by the following formula: in, A reliability target value is preset for the current to-be-repaired component of the customer vehicle engine under the current failure mode, N is the number of to-be-repaired components of the customer vehicle engine, and M is the number of failure modes corresponding to each to-be-repaired component of the customer vehicle engine.

4. The method according to claim 1, characterized in that: The parameters of the current to-be-repaired component of the customer vehicle engine under the current failure mode include: material constants of the current to-be-repaired component of the customer vehicle engine under the current failure mode, engine speed of the customer vehicle under the current failure mode, and engine torque of the customer vehicle under the current failure mode.

5. An engine bench durability test evaluation device, characterized in that: include: A collection unit is used to collect parameters of the current to-be-repaired parts of the customer vehicle engine under the current failure mode, the running time of the current to-be-repaired parts of the customer vehicle engine under the current failure mode, parameters of the current to-be-repaired parts of the bench durability test engine under the current failure mode, and the test time of the current to-be-repaired parts of the bench durability test engine under the current failure mode; The first input unit is used to input the parameters of the current to-be-repaired component of the customer vehicle engine under the current failure mode and the running time of the current to-be-repaired component of the customer vehicle engine under the current failure mode into a pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired component of the customer vehicle engine under the current failure mode; The second input unit is used to input the parameters of the current to-be-repaired parts of the bench durability test engine under the current failure mode and the test duration of the current to-be-repaired parts of the bench durability test engine under the current failure mode into the pre-trained engine damage model to obtain the accumulated damage of the current to-be-repaired parts of the bench durability test engine under the current failure mode; The first calculation unit is used to calculate the reliability prediction value of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode according to the preset test confidence in the current failure mode, the number of tests on the current to-be-repaired component of the engine of the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired component of the engine of the bench durability test under the current failure mode, the accumulated damage of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode, and the accumulated damage of the current to-be-repaired component of the engine of the bench durability test under the current failure mode; The determination unit is used to determine that when the reliability prediction value of the current parts to be repaired of the customer vehicle engine under the current failure mode is consistent with the preset reliability target value of the current parts to be repaired of the customer vehicle engine under the current failure mode, then it is determined that the bench durability test method of the current parts to be repaired of the engine under the current failure mode is reasonable.

6. The device according to claim 5, characterized in that The first computing unit is specifically configured to: Wherein, CL is the preset test confidence under the current failure mode, X is the number of tests on the current parts to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current parts to be repaired in the bench durability test engine under the current failure mode, and D customer ij D is the cumulative damage of the parts to be repaired in the customer vehicle engine under the current failure mode, test ij AF is the cumulative damage of the current parts to be repaired in the bench durability test engine under the current failure mode. ij It is the acceleration factor of the bench durability test of the current component to be repaired under the current failure mode relative to the B10 life mileage of the customer vehicle.

7. The device according to claim 5, characterized in that Also includes: The second calculation unit is used to preset the reliability target value of the current repaired component of the customer vehicle engine under the current failure mode. in, A reliability target value is preset for the current to-be-repaired component of the customer vehicle engine under the current failure mode, N is the number of to-be-repaired components of the customer vehicle engine, and M is the number of failure modes corresponding to each to-be-repaired component of the customer vehicle engine.

8. The device according to claim 5, characterized in that The parameters of the current to-be-repaired component of the customer vehicle engine under the current failure mode include: material constants of the current to-be-repaired component of the customer vehicle engine under the current failure mode, engine speed of the customer vehicle under the current failure mode, and engine torque of the customer vehicle under the current failure mode.

9. An engine bench durability test evaluation system, characterized in that: include: Memory for storing computer programs; A processor, configured to implement the steps of the engine bench durability test evaluation method as claimed in any one of claims 1 to 4 when executing the computer program.

10. A computer-readable medium, characterized in that The computer readable medium stores a computer program, and when the computer program is processed and executed, the steps of the engine bench durability test evaluation method according to any one of claims 1 to 4 are implemented.

Images