Engine bench durability test evaluation method, device, system and medium

Abstract

The present application provides an engine bench durability test evaluation method, device, system and medium, which calculates the reliability prediction value of the current to-be-repaired parts of the engine of the customer vehicle under the current failure mode based on the preset test confidence in the current failure mode, the number of tests of the current to-be-repaired parts of the bench durability test engine under the current failure mode, the shape parameters of the current to-be-repaired parts of the bench durability test engine under the current failure mode, the cumulative damage of the current to-be-repaired parts of the engine of the customer vehicle under the current failure mode and the cumulative damage of the current to-be-repaired parts of the bench durability test engine under the current failure mode; when the predicted value is consistent with the target value, the test method is determined to be reasonable. Through the pre-trained engine damage model, the engine damage can be accurately and quickly obtained, and the bench durability test can be associated with the customer vehicle to avoid the bench durability test assessment being divorced from reality. By calculating the predicted value, the engine bench durability test can be accurately evaluated.

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 testing is the primary means of verifying engine durability and reliability. Automotive engines generally use the B10 life as a reliability indicator: when a vehicle's driving life / mileage reaches the B10 life / mileage target, 10% of engines are expected to experience failures and require overhaul. To ensure that automotive engines meet the B10 life target upon market launch, bench durability testing of multiple samples is performed during the early stages of engine development.

[0003] Currently, 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 provides 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 section is provided to briefly introduce the concepts that will be described in detail in the Detailed Description of the Invention section below. This Summary of the Invention section is not intended to identify key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0006] The purpose of this 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 objectives, 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 parameters of the current repaired parts of the customer vehicle engine under the current failure mode, the operating time of the current repaired parts of the customer vehicle engine under the current failure mode, parameters of the current repaired parts of the bench durability test engine under the current failure mode, and the test time of the current repaired parts of the bench durability test engine under the current failure mode;

[0010] Inputting the parameters of the current to-be-repaired component of the customer vehicle engine under the current failure mode and the operating 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 cumulative damage of the current to-be-repaired component of the customer vehicle engine under the current failure mode;

[0011] Inputting the parameters of the current to-be-repaired component of the engine under the bench durability test in the current failure mode and the test duration of the current to-be-repaired component of the engine under the bench durability test in the current failure mode into the pre-trained engine damage model to obtain the cumulative damage of the current to-be-repaired component 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 component of the engine of the customer vehicle under the current failure mode based on the preset test confidence level under the current failure mode, the number of tests on the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the accumulated damage to the current to-be-repaired component of the engine of the customer vehicle under the current failure mode, and the accumulated damage to the current to-be-repaired component of the engine under 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 one possible implementation, the reliability prediction value of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode is calculated based on a preset test confidence level under the current failure mode, the number of tests on the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the accumulated damage to the current to-be-repaired component of the engine of the customer vehicle under the current failure mode, and the accumulated damage to the current to-be-repaired component of the engine under 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 component to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current component to be repaired in the bench durability test engine under the current failure mode, and D customer ij D is the cumulative damage to the parts of the customer vehicle engine to be repaired under the current failure mode, test ij AF is the cumulative damage of the 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 component to be repaired in the customer vehicle engine under the current failure mode is calculated using the following formula:

[0019]

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

[0021] In a possible implementation, the parameters of the current component to be repaired of the customer vehicle engine in the current failure mode include: material constants of the current component to be repaired 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 component of the customer vehicle engine under the current failure mode, the operating time of the current to-be-repaired component of the customer vehicle engine under the current failure mode, parameters of the current to-be-repaired component of the bench durability test engine under the current failure mode, and the test time of the current to-be-repaired component of the bench durability test engine under the current failure mode;

[0024] The first input unit is configured to input parameters of a current to-be-repaired component of the customer vehicle engine under the current failure mode and the operating 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 cumulative damage to the current to-be-repaired component of the customer vehicle engine under the current failure mode;

[0025] The second input unit is configured to input the parameters of the current to-be-repaired component of the engine under the bench durability test in the current failure mode and the test duration of the current to-be-repaired component 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 component of the engine under the bench durability test in the current failure mode;

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

[0027] The determination unit is configured to determine whether the bench durability test method for the engine's current to-be-repaired component under the current failure mode is reasonable when the reliability prediction value of the engine's current to-be-repaired component under the current failure mode is consistent with a preset reliability target value of the engine's current to-be-repaired component under the current failure mode.

[0028] In a possible implementation, 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 component to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current component to be repaired in the bench durability test engine under the current failure mode, and D customer ij D is the cumulative damage to the parts of the customer vehicle engine to be repaired under the current failure mode, test ij AF is the cumulative damage of the 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 repaired component of the customer vehicle engine under the current failure mode, N is the number of repaired components of the customer vehicle engine, and M is the number of failure modes corresponding to each repaired component of the customer vehicle engine.

[0034] In a possible implementation, the parameters of the current component to be repaired of the customer vehicle engine in the current failure mode include: material constants of the current component to be repaired 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 configured to implement the steps of the engine bench durability test evaluation method 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 a current to-be-repaired component of a customer vehicle engine under a current failure mode, operating time of the current to-be-repaired component of the customer vehicle engine under the current failure mode, parameters of a current to-be-repaired component of a bench durability test engine under the current failure mode and test time of the current to-be-repaired component of a bench durability test engine under the current failure mode; inputting the parameters of the current to-be-repaired component of the customer vehicle engine under the current failure mode and the operating 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, obtaining the cumulative damage of the current to-be-repaired component of the customer vehicle engine under the current failure mode; inputting the parameters of the current to-be-repaired component of the bench durability test engine under the current failure mode and the test time of the current to-be-repaired component of the 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 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 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 divorced from reality. The engine bench durability test is accurately evaluated through the calculated prediction value, so that the engine bench durability test can be adjusted in a targeted manner 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 various embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that 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 purposes, 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. However, the present application may also be implemented in other ways different from those described herein. 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, the applicant's research has revealed that engine bench durability testing is the primary means of verifying engine durability and reliability. Automotive engines generally use the B10 lifespan as a reliability indicator: when a vehicle's driving life / mileage reaches the B10 lifespan / mileage target, 10% of engines are expected to experience failures and require overhaul. To ensure that automotive engines meet the B10 lifespan target upon market launch, bench durability testing of multiple samples is performed during the early stages of engine development.

[0048] Currently, 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 provides 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, the embodiments of the present application provide an engine bench durability test evaluation method, device, system and medium, the method comprising: collecting parameters of the current to-be-repaired parts of the customer vehicle engine under the current failure mode, the operating 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; inputting the parameters of the current to-be-repaired parts of the customer vehicle engine under the current failure mode and the operating 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 cumulative damage of the current to-be-repaired parts of the customer vehicle engine under the current failure mode; inputting the parameters of the current to-be-repaired parts of the bench durability test engine under the current failure mode and the operating time of the current to-be-repaired parts of the bench durability test engine under the current failure mode into a pre-trained engine damage model to obtain the cumulative damage of the current to-be-repaired parts of the customer vehicle engine under the current failure mode; inputting the parameters of the current to-be-repaired parts of the bench durability test engine under the current failure mode and the running time of the current to-be-repaired parts of the bench durability test engine under the current failure mode The test time is input into the pre-trained engine damage model 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 engine 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 engine 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 engine 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 engine 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 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 divorced from reality. The engine bench durability test is accurately evaluated through the calculated prediction value, 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, including:

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

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

[0057] For example, the failure mechanism of each failure mode can be used to analyze the primary load factors. For example, if the current failure mode is high-cycle fatigue fracture of a connecting rod, the component to be repaired is the engine connecting rod. When the cylinder is in the compression and expansion strokes, the connecting rod is subject to compressive stress. When the cylinder piston is near the top dead center of the exhaust stroke, the gas pressure in the cylinder is low and the piston acceleration is high. Under the action of the piston's reciprocating inertia force, the connecting rod is subject to tensile stress. This cyclic stress will cause fatigue damage to the connecting rod, and when the damage accumulates to a certain level, fatigue fracture will occur. According to Miner's linear cumulative damage theory, the amount of fatigue damage can be calculated from the stress amplitude, stress mean, and number of stress cycles. The stress amplitude and stress mean are strongly correlated with engine speed and torque, while the number of stress cycles is strongly correlated with engine operating 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 the 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 cumulative damage D of the parts to be repaired in the engine of the customer's vehicle 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 component 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 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 component of the engine under the bench durability test in 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 component 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 engine bench durability test under the current failure mode. p = 1, 2, ..., O, where O represents the number of operating condition segments of the current component to be repaired in the engine bench durability test under the current failure mode.

[0062] Therefore, the present application can calculate 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 for 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 the input elements and the cumulative damage of known engine parts to be repaired under known failure modes; and model parameters of the initial engine damage model are determined based on the mapping relationship to train a pre-trained engine damage model.

[0065] S104: Calculate the reliability prediction value of the current part to be repaired of the engine of the customer vehicle under the current failure mode based on the preset test confidence level in the current failure mode, the number of tests on the current part to be repaired of the engine under the bench durability test in the current failure mode, the shape parameters of the current part to be repaired of the engine under the bench durability test in the current failure mode, the cumulative damage to the current part to be repaired of the engine of the customer vehicle under the current failure mode, and the cumulative damage to the current part 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 component to be repaired of the customer vehicle engine under the current failure mode is consistent with the preset reliability target value of the current component 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 component to be repaired 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 one possible implementation, the embodiment of the present application provides a method for calculating the reliability prediction value of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode based on a preset test confidence level in the current failure mode, the number of tests on the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the accumulated damage to the current to-be-repaired component of the engine of the customer vehicle under the current failure mode, and the accumulated damage to the current to-be-repaired component of the engine under the bench durability test under the current failure mode. Specifically, the method may 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 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 time 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 When, 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 component to be repaired in 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 repaired component in the engine bench durability test under the current failure mode. Shape parameters are generally selected based on experience. Typically, the value for the exhaust system is 3.0, the body is 2.5, and the suspension is 2.03. If no experience is available, 1.5 is used. t represents the operating time of the product.

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

[0076] According to the above current failure mode, the acceleration factor AF of the bench durability test of the current component to be repaired 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 durability test is T, the duration of the customer vehicle's B10 life mileage equivalent bench durability test is T / AF ij , put the two time lengths into the test, and get the target reliability value of the current repaired component of the bench durability test engine under 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 formulas (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 customer vehicle 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 repair component of the customer vehicle engine under the current failure mode is consistent with the preset reliability target value of the current repair component of the customer vehicle engine under the current failure mode, It is determined that the bench durability test method for the engine component 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-assessed 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 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 one possible implementation, the preset reliability target value of the current repair component of the customer vehicle engine under the current failure mode provided in the embodiment of the present application can be calculated using the following formula:

[0086]

[0087] in, A preset reliability target value is set for the current repair component in the customer vehicle's engine under the current failure mode. N is the number of repair components in the customer vehicle's engine, and M is the number of failure modes corresponding to each repair component. Different components have different failure modes and a different number of failure modes.

[0088] In this embodiment, based on product reliability theory, assuming the engine's B10 reliability target is set at 10 years / 240,000 kilometers, 10% of engines will experience failures and require overhaul when the vehicle reaches 10 years of life or 240,000 kilometers of mileage. This means the engine reliability for 10 years / 240,000 kilometers is 90%. The preset reliability target for the currently repaired component in the customer vehicle's engine under the current failure mode is the reliability target corresponding to 10 years and 240,000 kilometers.

[0089] Optionally, the current failure modes provided by the embodiments 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 a current to-be-repaired component of a customer vehicle engine under a current failure mode, operating time of the current to-be-repaired component of the customer vehicle engine under a current failure mode, parameters of a current to-be-repaired component of a bench durability test engine under a current failure mode, and test time of the current to-be-repaired component of a bench durability test engine under a current failure mode; inputting the parameters of the current to-be-repaired component of the customer vehicle engine under a current failure mode and the operating time of the current to-be-repaired component of the customer vehicle engine under a current failure mode into a pre-trained engine damage model to obtain the cumulative damage of the current to-be-repaired component of the customer vehicle engine under a current failure mode; inputting the parameters of the current to-be-repaired component of the bench durability test engine under a current failure mode and the test time of the current to-be-repaired component of the bench durability test ... 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 of the customer vehicle under 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 under 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 under 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 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. 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 divorced from reality. The engine bench durability test is accurately evaluated through the calculated prediction value, so that the engine bench durability test can be adjusted in a targeted manner 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 parameters of the current repair component of the customer vehicle engine under the current failure mode, the operating time of the current repair component of the customer vehicle engine under the current failure mode, parameters of the current repair component of the bench durability test engine under the current failure mode, and the test time of the current repair component of the bench durability test engine under the current failure mode;

[0095] The first input unit 202 is configured to input the parameters of the current to-be-repaired component of the customer vehicle engine under the current failure mode and the operating 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 configured to input the parameters of the current to-be-repaired component of the engine under the bench durability test in the current failure mode and the test duration of the current to-be-repaired component 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 component of the engine under the bench durability test in the current failure mode;

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

[0098] The determination unit 205 is used to determine whether the bench durability test method for the engine's current repaired component under the current failure mode is reasonable when the reliability prediction value of the engine's current repaired component under the current failure mode is consistent with the preset reliability target value of the engine's current repaired component under the current failure mode.

[0099] In a possible implementation, 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 component to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current component to be repaired in the bench durability test engine under the current failure mode, and D customer ij D is the cumulative damage to the parts of the customer vehicle engine to be repaired under the current failure mode, test ij AF is the cumulative damage of the 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 repaired component of the customer vehicle engine under the current failure mode, N is the number of repaired components of the customer vehicle engine, and M is the number of failure modes corresponding to each repaired component of the customer vehicle engine.

[0105] In a possible implementation, the parameters of the current component to be repaired of the customer vehicle engine in the current failure mode include: material constants of the current component to be repaired 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 the current to-be-repaired parts of the customer vehicle engine under the current failure mode, the operating 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; inputting the parameters of the current to-be-repaired parts of the customer vehicle engine under the current failure mode and the operating 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 cumulative damage of the current to-be-repaired parts of the customer vehicle engine under the current failure mode; inputting the 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 into a pre-trained engine damage model to obtain the cumulative damage of the current to-be-repaired parts of the customer vehicle engine 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 engine under 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 engine under 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 engine under 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 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. 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 divorced from reality. The engine bench durability test is accurately evaluated through the calculated prediction value, so that the engine bench durability test can be adjusted in a targeted manner later.

[0107] Based on the above embodiments, the present invention 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] Based on the above embodiment, the embodiment of the present application further provides a computer-readable medium, on which a computer program is stored. 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 mentioned above in the present disclosure may be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, 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 that contains or stores a program that can be used by or in conjunction with an instruction execution system, device, or component. In the present disclosure, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport 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 thereof.

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

[0113] In particular, according to embodiments of the present disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program including program code for executing the methods shown in the flowcharts.

[0114] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences from the other embodiments. In particular, the device embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0115] The above is only a preferred embodiment 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 with equivalent changes. Therefore, any simple modifications, equivalent changes and modifications 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 are still 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 parameters of the current repaired parts of the customer vehicle engine under the current failure mode, the operating time of the current repaired parts of the customer vehicle engine under the current failure mode, parameters of the current repaired parts of the bench durability test engine under the current failure mode, and the test time of the current repaired parts of the bench durability test engine under the current failure mode; The parameters of the engine component to be repaired include: material constants of the engine component to be repaired, engine speed, and engine torque; Inputting the parameters of the current to-be-repaired component of the customer vehicle engine under the current failure mode and the operating 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 cumulative damage of the current to-be-repaired component of the customer vehicle engine under the current failure mode; Inputting the parameters of the current to-be-repaired component of the engine under the bench durability test in the current failure mode and the test duration of the current to-be-repaired component of the engine under the bench durability test in the current failure mode into the pre-trained engine damage model to obtain the cumulative damage of the current to-be-repaired component of the engine under the bench durability test in the current failure mode; Calculate the reliability prediction value of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode based on the preset test confidence level under the current failure mode, the number of tests on the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the accumulated damage to the current to-be-repaired component of the engine of the customer vehicle under the current failure mode, and the accumulated damage to the current to-be-repaired component of the engine under 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 component of the engine of the customer vehicle under the current failure mode is calculated based on the preset test confidence level under the current failure mode, the number of tests on the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the shape parameters of the current to-be-repaired component of the engine under the bench durability test under the current failure mode, the cumulative damage to the current to-be-repaired component of the engine of the customer vehicle under the current failure mode, and the cumulative damage to the current to-be-repaired component of the engine under 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 component to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current component to be repaired in the bench durability test engine under the current failure mode, is the cumulative damage to the parts of the customer's vehicle engine to be repaired under the current failure mode, is the cumulative damage of the parts to be repaired in the bench durability test engine under the current failure mode, 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 repair component of the customer vehicle engine under the current failure mode is calculated using the following formula: ； in, A reliability target value is preset for the current repaired component of the customer vehicle engine under the current failure mode, N is the number of repaired components of the customer vehicle engine, and M is the number of failure modes corresponding to each repaired component of the customer vehicle engine.

4. 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 component of the customer vehicle engine under the current failure mode, the operating time of the current to-be-repaired component of the customer vehicle engine under the current failure mode, parameters of the current to-be-repaired component of the bench durability test engine under the current failure mode, and the test time of the current to-be-repaired component of the bench durability test engine under the current failure mode; The parameters of the engine component to be repaired include: material constants of the engine component to be repaired, engine speed, and engine torque; The first input unit is configured to input parameters of a current to-be-repaired component of the customer vehicle engine under the current failure mode and the operating 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 cumulative damage to the current to-be-repaired component of the customer vehicle engine under the current failure mode; The second input unit is configured to input the parameters of the current to-be-repaired component of the engine under the bench durability test in the current failure mode and the test duration of the current to-be-repaired component 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 component of the engine under the bench durability test in the current failure mode; The first calculation unit is configured to calculate a reliability prediction value of the current to-be-repaired component of the engine of the customer vehicle under the current failure mode based on a preset test confidence level under the current failure mode, the number of tests on the current to-be-repaired component of the engine under the bench durability test under the current failure mode, shape parameters of the current to-be-repaired component of the engine under the bench durability test under the current failure mode, accumulated damage to the current to-be-repaired component of the engine of the customer vehicle under the current failure mode, and accumulated damage to the current to-be-repaired component of the engine under the bench durability test under the current failure mode; The determination unit is configured to determine whether the bench durability test method for the engine's current to-be-repaired component under the current failure mode is reasonable when the reliability prediction value of the engine's current to-be-repaired component under the current failure mode is consistent with a preset reliability target value of the engine's current to-be-repaired component under the current failure mode.

5. The device according to claim 4, 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 component to be repaired in the bench durability test engine under the current failure mode, β is the shape parameter of the current component to be repaired in the bench durability test engine under the current failure mode, is the cumulative damage to the parts of the customer's vehicle engine to be repaired under the current failure mode, is the cumulative damage of the parts to be repaired in the bench durability test engine under the current failure mode, 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.

6. The device according to claim 4, characterized in that Also includes: The second calculation unit is used to calculate the current repair part of the customer vehicle engine in the current failure mode. Preset reliability target value of the component ; ;in, A reliability target value is preset for the current repaired component of the customer vehicle engine under the current failure mode, N is the number of repaired components of the customer vehicle engine, and M is the number of failure modes corresponding to each repaired component of the customer vehicle engine.

7. 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 according to any one of claims 1 to 3 when executing the computer program.

8. A computer-readable medium, characterized in that The computer readable medium stores a computer program, which, when processed and executed, implements the steps of the engine bench durability test evaluation method according to any one of claims 1 to 3.

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