Diagnosis method, system and equipment for cracking fault of engine flywheel casing and medium
By obtaining and analyzing information about the flywheel housing fault vehicle, using simulation and analysis software to simulate static strength, fatigue strength and stress strain, determine the cause of the fault and calculate the resonance frequency excitation source, it solves the inaccurate diagnosis and insufficient resonance frequency consideration in the prior art. The problem of this achieves accurate diagnosis and resonance analysis of engine flywheel housing faults.
Patent Information
- Application Number
- CN202411301367.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-01-03
AI Technical Summary
The prior art is difficult to accurately diagnose the fault mechanism of engine flywheel shell cracking fault, and there is little consideration for the powertrain resonance frequency, so it is impossible to effectively analyze the impact of the powertrain resonance direction on flywheel shell cracking.
By obtaining the vehicle preliminary information of the flywheel shell fault vehicle, the three-dimensional geometric model of the powertrain and historical operation data, the simulation software and analysis software are used to simulate static strength, fatigue strength and stress strain, determine the cause of the fault, and calculate the powertrain resonance frequency The excitation source of the stimulus is sent to the maintenance terminal.
Accurate diagnosis of the cause of cracking fault of the engine flywheel housing is realized, the powertrain resonance excitation source is identified, and the remaining fatigue life is calculated, which solves the problems of inaccurate diagnosis and insufficient resonance frequency consideration in the prior art.
Smart Images
Figure CN119246032A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of live broadcast auxiliary application technology, and in particular to a method, system, equipment and medium for diagnosing engine flywheel housing cracking faults. Background Art
[0002] The engine flywheel housing is located at the rear of the engine. Its main function is to connect the engine crankshaft and the transmission, and undertake the important tasks of balancing the moment of inertia, transmitting torque, and reducing the vibration and impact of the engine during operation. The structural design and material selection of the flywheel housing have a vital impact on the stability, durability and safety of the vehicle power system. During the driving process of the vehicle, the flywheel housing is always in a complex and changeable mechanical environment, which is prone to damage and failure, and there are serious safety hazards.
[0003] In the existing technology, the diagnosis of flywheel housing cracking failure is mainly carried out by comparing with similar models in the market that have not experienced flywheel housing cracking failure, or qualitatively judging the cause of the failure through design experience. It is difficult to accurately and efficiently diagnose the failure mechanism of the flywheel housing and then take measures to improve and optimize it. In addition, the existing technology pays little attention to the resonance frequency of the powertrain when the flywheel housing cracks.
[0004] Therefore, there is an urgent need for a diagnostic method, system, equipment and medium for engine flywheel housing cracking fault to solve the problem that existing flywheel housing fault diagnosis technology is difficult to accurately diagnose the failure mechanism of the flywheel housing. In addition, the existing technology pays little attention to the resonance frequency of the powertrain when the flywheel housing cracks, making it difficult to diagnose the resonance excitation source of the powertrain and unable to solve the problem of flywheel housing cracking analysis in the resonance direction of the powertrain. Summary of the invention
[0005] In view of the above-mentioned deficiencies in the prior art, the present application provides a method, system and medium for diagnosing engine flywheel housing cracking faults, so as to solve the problem that the existing flywheel housing fault diagnosis technology is difficult to accurately diagnose the failure mechanism of the flywheel housing. In addition, the prior art pays little attention to the resonance frequency of the powertrain when the flywheel housing cracks, making it difficult to diagnose the resonance excitation source of the powertrain, and is unable to solve the problem of flywheel housing cracking analysis in the resonance direction of the powertrain.
[0006] In a first aspect, the present application provides a method for diagnosing a cracking fault of an engine flywheel housing, the method comprising: Obtain preliminary vehicle information of the vehicle with a flywheel housing failure; wherein the preliminary vehicle information includes at least: powertrain configuration and historical vehicle speed of the faulty vehicle, and then use the preliminary information of historical faulty vehicles to determine whether the fault cause of the current vehicle with a flywheel housing failure is the vehicle configuration or the vehicle speed condition; when the fault cause is not the vehicle configuration and the vehicle speed condition, obtain the flywheel housing material information of the vehicle with a flywheel housing failure, and then determine whether the fault cause is a material reason; when the fault cause is not a material reason, obtain a three-dimensional geometric model of the powertrain of the vehicle with a flywheel housing failure, and then use simulation software to simulate the static strength value of the flywheel housing under impact loads in several preset directions; determine whether the fault cause is that the static strength value does not meet the preset static strength conditions; wherein the powertrain includes at least an engine, a gearbox, a clutch housing, and a flywheel housing; when the static strength value meets the preset static strength conditions, call the preset analysis software to obtain the limit load of the flywheel housing, and then based on the limit load and the preset The ratio of allowable loads is used to obtain the fatigue strength of the flywheel housing; determine whether the cause of the failure is that the fatigue strength of the flywheel housing does not meet the preset fatigue strength condition; when the fatigue strength of the flywheel housing meets the preset fatigue strength condition, start the stress-strain test, and obtain the maximum peak stress of the flywheel housing through several measuring points arranged on the flywheel housing; determine whether the cause of the failure is that the maximum peak stress does not meet the preset peak stress condition; when the maximum peak stress meets the preset peak stress condition, obtain the engine natural frequency and the gearbox natural frequency under the simulation of the flywheel housing fault vehicle, and calculate the first-order excitation frequency of the drive shaft according to the historical operation data of the faulty vehicle; obtain the powertrain resonance frequency of the flywheel housing fault vehicle, and then determine the excitation source of the powertrain resonance frequency based on the relationship between the powertrain resonance frequency, the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the drive shaft; send the cause of the failure or the excitation source of the powertrain resonance frequency to the preset maintenance terminal.
[0007] Furthermore, the preliminary information of historical faulty vehicles is used to determine whether the fault cause of the current flywheel housing faulty vehicle is the vehicle configuration or vehicle speed condition, including: When the powertrain configuration is the same as the powertrain configuration in the preliminary information of historical faulty vehicles, it is determined that the fault cause of the current flywheel housing faulty vehicle is the vehicle configuration; when the historical vehicle speed of the faulty vehicle with the most frequency of flywheel housing faulty vehicles within a preset historical operating time period is the same as the historical vehicle speed of the faulty vehicle in the preliminary information of historical faulty vehicles, it is determined that the fault cause of the current flywheel housing faulty vehicle is the vehicle speed condition.
[0008] Furthermore, a three-dimensional geometric model of the powertrain of the vehicle with the flywheel housing failure is obtained, and then the static strength value of the flywheel housing under the impact loads in several preset directions is simulated by using simulation software; determining whether the cause of the failure is that the static strength value does not meet the preset static strength conditions, specifically including: The simulation software is used to apply gravity acceleration in the three orthogonal directions of x, y, and z of the three-dimensional geometric model to simulate the static strength value of the flywheel housing under impact loads in different directions; when the static strength value is within the preset reasonable range of static strength, it is determined that the static strength value meets the preset static strength condition; when the static strength value is not within the preset reasonable range of static strength, it is determined that the static strength value does not meet the preset static strength condition.
[0009] Further, the preset analysis software is called to obtain the limit load of the flywheel housing, and then the fatigue strength of the flywheel housing is obtained based on the ratio of the limit load to the preset allowable load; determining whether the cause of the fault is that the fatigue strength of the flywheel housing does not meet the preset fatigue strength condition, specifically including: The ultimate load of the flywheel housing is obtained through the Trans MAX channel of the FEMFAT software; the fatigue strength of the flywheel housing is obtained based on the ratio of the ultimate load to the preset allowable load; when the fatigue strength of the flywheel housing is less than the preset strength, it is determined that the fatigue strength of the flywheel housing does not meet the preset fatigue strength condition.
[0010] Furthermore, the maximum peak stress of the flywheel housing is obtained by arranging several measuring points on the flywheel housing, specifically including: By arranging a number of measuring points on the flywheel housing, the maximum peak stress on the flywheel housing that can be collected by the measuring points at a preset high speed is obtained.
[0011] Furthermore, according to the historical operation data of the faulty vehicle, the first-order excitation frequency of the transmission shaft is calculated, which specifically includes: According to the formula: , , The first-order excitation frequency f of the transmission shaft is obtained by calculation; wherein the historical operation data of the faulty vehicle at least includes: Drive shaft speed, Engine speed, The highest gear ratio of the transmission.
[0012] Furthermore, based on the relationship between the powertrain resonance frequency, the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the drive shaft, the excitation source of the powertrain resonance frequency is determined, specifically including: calculating the difference between the powertrain resonance frequency and the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the drive shaft in sequence; and determining the frequency with the smallest difference as the excitation source of the powertrain resonance frequency.
[0013] Further, after determining the excitation source of the powertrain resonant frequency, the method further includes: Obtain the yield strength S of the flywheel housing material, J environmental factors, and the equivalent stress peak value of the flywheel housing , Design life cycle number , Material preset constants , the cracking preset constant corresponding to the jth environmental factor , the quantitative value of the jth environmental factor ; Through the formula: , , calculate the remaining fatigue life ;in, Indicates the current loop number, and ∈(1, ).
[0014] In a second aspect, the present application provides a system for diagnosing engine flywheel housing cracking faults, the system comprising: The first diagnostic module is used to obtain preliminary vehicle information of a vehicle with a flywheel housing fault; wherein the preliminary vehicle information includes at least: powertrain configuration and historical vehicle speed of the faulty vehicle, and then use the preliminary information of historical faulty vehicles to determine whether the fault cause of the current vehicle with a flywheel housing fault is the vehicle configuration or the vehicle speed condition; the second diagnostic module is used to obtain the flywheel housing material information of the vehicle with a flywheel housing fault when the fault cause is not the vehicle configuration and the vehicle speed condition, and then determine whether the fault cause is a material reason; when the fault cause is not a material reason, obtain a three-dimensional geometric model of the powertrain of the vehicle with a flywheel housing fault, and then use simulation software to simulate the static strength value of the flywheel housing under impact loads in several preset directions; determine whether the fault cause is that the static strength value does not meet the preset static strength conditions; wherein the powertrain includes at least an engine, a gearbox, a clutch housing, and a flywheel housing; when the static strength value meets the preset static strength conditions, call the preset analysis software to obtain the limit load of the flywheel housing, and then based on the limit The ratio of the load to the preset allowable load is used to obtain the fatigue strength of the flywheel housing; determine whether the cause of the fault is that the fatigue strength of the flywheel housing does not meet the preset fatigue strength condition; the third diagnostic module is used to start the stress-strain test when the fatigue strength of the flywheel housing meets the preset fatigue strength condition, and obtain the maximum peak stress of the flywheel housing through a number of measuring points arranged on the flywheel housing; determine whether the cause of the fault is that the maximum peak stress does not meet the preset peak stress condition; when the maximum peak stress meets the preset peak stress condition, obtain the engine natural frequency and the gearbox natural frequency under the simulation of the flywheel housing fault vehicle, and calculate the first-order excitation frequency of the drive shaft according to the historical operation data of the faulty vehicle; obtain the powertrain resonance frequency of the flywheel housing fault vehicle, and then determine the excitation source of the powertrain resonance frequency based on the relationship between the powertrain resonance frequency, the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the drive shaft; send the cause of the fault or the excitation source of the powertrain resonance frequency to the preset maintenance terminal.
[0015] In a third aspect, the present application provides a non-volatile computer storage medium having computer instructions stored thereon, which, when executed, implement a method for diagnosing an engine flywheel housing cracking fault as described in any one of the above items.
[0016] Those skilled in the art can understand that the present application has at least the following beneficial effects: The cause of the engine flywheel housing cracking failure can be diagnosed step by step, solving the problem that the existing flywheel housing fault diagnosis technology is difficult to accurately diagnose the failure mechanism of the flywheel housing. In addition, when the maximum peak stress meets the preset peak stress condition, the present application can calculate the powertrain resonance excitation source, solving the problem that the existing technology pays little attention to the resonance frequency of the powertrain when the flywheel housing cracks, making it difficult to diagnose the powertrain resonance excitation source and unable to analyze the flywheel housing cracking from the direction of solving the powertrain resonance.
[0017] In addition, after determining the excitation source of the powertrain resonant frequency, the present application can calculate the remaining fatigue life of the flywheel housing through the corresponding data of the flywheel housing. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Some embodiments of the present disclosure are described below with reference to the accompanying drawings, in which: Figure 1 It is a flow chart of a method for diagnosing engine flywheel housing cracking fault provided in an embodiment of the present application.
[0019] Figure 2 It is a schematic diagram of the internal structure of a diagnosis system for engine flywheel housing cracking fault provided in an embodiment of the present application. DETAILED DESCRIPTION
[0020] It should be understood by those skilled in the art that the embodiments described below are only preferred embodiments of the present disclosure, and do not mean that the present disclosure can only be implemented through the preferred embodiments. The preferred embodiments are only used to explain the technical principles of the present disclosure, and are not used to limit the protection scope of the present disclosure. Based on the preferred embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present disclosure.
[0021] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.
[0022] The technical solution proposed in the embodiments of the present application is described in detail below with reference to the accompanying drawings.
[0023] The present application embodiment provides a method for diagnosing a cracking fault of an engine flywheel housing, such as Figure 1 As shown, the method provided in the embodiment of the present application mainly includes the following steps: Step 110: Obtain preliminary vehicle information of the vehicle with flywheel housing failure, and then use the preliminary information of historical failed vehicles to determine whether the cause of the current flywheel housing failure is the vehicle configuration or the vehicle speed condition.
[0024] It should be noted that the preliminary vehicle information includes at least: powertrain configuration (engine, gearbox model, flywheel housing material, drive shaft structure and rear axle speed ratio, etc.) and the historical speed of the faulty vehicle.
[0025] Among them, the preliminary information of historical faulty vehicles is used to determine whether the fault cause of the current flywheel housing faulty vehicle is the vehicle configuration or the vehicle speed condition, which can be specifically: When the powertrain configuration is the same as the powertrain configuration in the preliminary information of historical faulty vehicles, it is determined that the fault cause of the current flywheel housing faulty vehicle is the vehicle configuration; when the historical vehicle speed of the faulty vehicle with the most frequency of flywheel housing faulty vehicles within a preset historical operating time period is the same as the historical vehicle speed of the faulty vehicle in the preliminary information of historical faulty vehicles, it is determined that the fault cause of the current flywheel housing faulty vehicle is the vehicle speed condition.
[0026] Step 120: When the cause of the fault is not the vehicle configuration and the vehicle speed condition, obtain the flywheel housing material information of the vehicle with the flywheel housing fault, and then determine whether the cause of the fault is the material reason.
[0027] As an example, the flywheel housing body is subjected to quality tests such as wall thickness, material chemical composition and metallographic structure, tensile strength and elongation; based on the experimental results, it is determined whether the material, wall thickness, etc. of the flywheel housing body meet the design requirements.
[0028] Step 130: When the cause of the failure is not due to material reasons, obtain a three-dimensional geometric model of the powertrain of the vehicle with the flywheel housing failure, and then use simulation software to simulate the static strength value of the flywheel housing under impact loads in several preset directions; determine whether the cause of the failure is that the static strength value does not meet the preset static strength conditions.
[0029] It should be noted that the powertrain at least includes an engine, a gearbox, a clutch housing, and a flywheel housing.
[0030] The acquisition process of the 3D geometric model can be as follows: according to the structural parameters of the powertrain (including the engine, gearbox, clutch housing, flywheel housing, bracket, etc.), a 3D geometric model is established in the Creo software. Specifically, the joint interface between the flywheel housing and the engine body adopts a fully constrained simplified constraint condition, while the connection between the flywheel housing and the clutch housing adopts a close fit between the cylindrical surface of the connecting bolt and the corresponding bolt hole. The mass center unit of the transmission assembly is connected to the front clutch flywheel housing assembly and the rear rubber shock absorber pad through rigid connection technology, and the latter is fully constrained at the joint interface with the frame steel plate.
[0031] Among them, a three-dimensional geometric model of the powertrain of the vehicle with a flywheel housing failure is obtained, and then the static strength value of the flywheel housing under the impact loads in several preset directions is simulated by using simulation software; it is determined whether the cause of the failure is that the static strength value does not meet the preset static strength conditions, which can be specifically: Use simulation software (for example, Abaqus software) to apply gravity acceleration in the three orthogonal directions of x, y, and z of the three-dimensional geometric model to simulate the static strength value of the flywheel housing under impact loads in different directions; when the static strength value is within the preset reasonable range of static strength, it is determined that the static strength value meets the preset static strength condition; when the static strength value is not within the preset reasonable range of static strength, it is determined that the static strength value does not meet the preset static strength condition.
[0032] Step 140: When the static strength value meets the preset static strength condition, call the preset analysis software to obtain the ultimate load of the flywheel housing, and then obtain the fatigue strength of the flywheel housing based on the ratio of the ultimate load to the preset allowable load; determine whether the cause of the fault is that the fatigue strength of the flywheel housing does not meet the preset fatigue strength condition.
[0033] It should be noted that the preset analysis software may be FEMFAT software.
[0034] The preset analysis software is called to obtain the limit load of the flywheel housing, and then the fatigue strength of the flywheel housing is obtained based on the ratio of the limit load to the preset allowable load; whether the cause of the fault is that the fatigue strength of the flywheel housing does not meet the preset fatigue strength condition is determined, which can be specifically: The ultimate load of the flywheel housing is obtained through the Trans MAX channel of the FEMFAT software; the fatigue strength of the flywheel housing is obtained based on the ratio of the ultimate load to the preset allowable load; when the fatigue strength of the flywheel housing is less than the preset strength, it is determined that the fatigue strength of the flywheel housing does not meet the preset fatigue strength condition.
[0035] It should be additionally noted that the preset strength may be 1.1.
[0036] Step 150: When the fatigue strength of the flywheel housing meets the preset fatigue strength condition, start the stress-strain test, obtain the maximum peak stress of the flywheel housing through a number of measuring points arranged on the flywheel housing, and determine whether the cause of the fault is that the maximum peak stress does not meet the preset peak stress condition.
[0037] Among them, the maximum peak stress of the flywheel housing is obtained by arranging several measuring points on the flywheel housing, specifically including: By arranging a number of measuring points on the flywheel housing, the maximum peak stress on the flywheel housing that can be collected by the measuring points at a preset high speed is obtained.
[0038] Step 160: When the maximum peak stress meets the preset peak stress condition, the engine natural frequency and the gearbox natural frequency under the simulation of the flywheel housing fault vehicle are obtained, and the first-order excitation frequency of the transmission shaft is calculated based on the historical operation data of the faulty vehicle.
[0039] Among them, obtaining the engine natural frequency and the gearbox natural frequency under the flywheel housing fault vehicle simulation can be used to directly obtain input data.
[0040] The simulation process can be as follows: first, a blank project is created in the LMS Test.Lab software, and the sensor measurement points are arranged and connected to the instrument. The whole vehicle state is also used as the test object. Each component is in a constrained state after the whole vehicle is assembled. Multiple measurement points are arranged on the left and right sides of the engine front suspension, the left and right sides of the engine flywheel housing, the left and right sides of the gearbox rear suspension, and the surface of the transmission shaft; a geometric simplified model is established in the software according to the position of the arrangement points; then a force hammer is used to knock on the left and right sides of the flywheel housing for many times. Since the modal frequency of the powertrain is low, a 086D05 specification force hammer is used to match the rubber hammer head for testing. The measurement point signals are collected by the acceleration sensor and transmitted to the computer. The data is processed and analyzed in the LMS Test. Lab software to obtain the frequency response function curve, vibration acceleration curve and spectrum diagram of the powertrain in the whole vehicle assembly state, that is, the vibration frequency and corresponding engine speed when the powertrain resonates are obtained.
[0041] Among them, the first-order excitation frequency of the transmission shaft is calculated based on the historical operation data of the faulty vehicle, which specifically includes: According to the formula: , , The first-order excitation frequency f of the transmission shaft is obtained by calculation; wherein the historical operation data of the faulty vehicle at least includes: Drive shaft speed, Engine speed, The highest gear ratio of the transmission.
[0042] Step 170: Obtain the powertrain resonance frequency of the vehicle with the flywheel housing failure, and then determine the excitation source of the powertrain resonance frequency based on the relationship between the powertrain resonance frequency, the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the drive shaft; send the cause of the failure or the excitation source of the powertrain resonance frequency to a preset maintenance terminal.
[0043] Among them, based on the relationship between the powertrain resonance frequency, the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the transmission shaft, the excitation source of the powertrain resonance frequency is determined, specifically including: The differences between the powertrain resonance frequency and the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the drive shaft are calculated in sequence; and the frequency with the smallest difference is determined as the excitation source of the powertrain resonance frequency.
[0044] In addition, the present application can also perform residual fatigue life calculation. The specific process can be: after determining the excitation source of the powertrain resonance frequency, obtain the yield strength S of the flywheel housing body material, J environmental factors, and the equivalent stress peak value of the flywheel housing. , Design life cycle number , Material preset constants , the cracking preset constant corresponding to the jth environmental factor , the quantitative value of the jth environmental factor .
[0045] By formula: , , calculate the remaining fatigue life ;in, Indicates the current loop number, and ∈(1, ).
[0046] besides, Figure 2 The present invention provides a diagnostic system for a cracking fault of an engine flywheel housing. Figure 2 As shown, the system provided in the embodiment of the present application mainly includes: The first diagnostic module 210 is used to obtain preliminary vehicle information of the vehicle with flywheel housing failure; wherein the preliminary vehicle information at least includes: powertrain configuration and historical vehicle speed of the faulty vehicle, and then use the preliminary information of historical faulty vehicles to determine whether the cause of the current flywheel housing faulty vehicle is the vehicle configuration or speed condition.
[0047] The second diagnostic module 220 is used to obtain the flywheel housing material information of the vehicle with the flywheel housing fault when the cause of the fault is not the vehicle configuration and the vehicle speed condition, and then determine whether the cause of the fault is the material reason; when the cause of the fault is not the material reason, obtain the three-dimensional geometric model of the powertrain of the vehicle with the flywheel housing fault, and then use the simulation software to simulate the static strength value of the flywheel housing under the impact loads in several preset directions; determine whether the cause of the fault is that the static strength value does not meet the preset static strength conditions; wherein the powertrain includes at least an engine, a gearbox, a clutch housing, and a flywheel housing; when the static strength value meets the preset static strength conditions, call the preset analysis software to obtain the limit load of the flywheel housing, and then obtain the fatigue strength of the flywheel housing based on the ratio of the limit load to the preset allowable load; determine whether the cause of the fault is that the fatigue strength of the flywheel housing does not meet the preset fatigue strength conditions.
[0048] The third diagnostic module 230 is used to start the stress-strain test when the fatigue strength of the flywheel housing meets the preset fatigue strength condition, and obtain the maximum peak stress of the flywheel housing through a number of measuring points arranged on the flywheel housing; determine whether the cause of the fault is that the maximum peak stress does not meet the preset peak stress condition; when the maximum peak stress meets the preset peak stress condition, obtain the engine natural frequency and the gearbox natural frequency under the simulation of the flywheel housing fault vehicle, and calculate the first-order excitation frequency of the drive shaft based on the historical operation data of the faulty vehicle; obtain the powertrain resonance frequency of the flywheel housing faulty vehicle, and then determine the excitation source of the powertrain resonance frequency based on the relationship between the powertrain resonance frequency, the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the drive shaft; send the cause of the fault or the excitation source of the powertrain resonance frequency to the preset maintenance terminal.
[0049] In addition, an embodiment of the present application further provides a non-volatile computer storage medium on which executable instructions are stored. When the executable instructions are executed, a method for diagnosing an engine flywheel housing cracking fault as described above is implemented.
[0050] So far, the technical solutions of the present disclosure have been described in combination with the above multiple embodiments, but it is easy for those skilled in the art to understand that the protection scope of the present disclosure is not limited to these specific embodiments. Without departing from the technical principles of the present disclosure, those skilled in the art can split and combine the technical solutions in the above-mentioned various embodiments, and can also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principle of the present disclosure will fall within the protection scope of the present disclosure.
Claims
1. A method for diagnosing engine flywheel housing cracking fault, characterized in that: The method comprises: Obtaining preliminary vehicle information of the vehicle with a flywheel housing failure; wherein the preliminary vehicle information at least includes: powertrain configuration and historical vehicle speed of the failed vehicle, and then using the preliminary information of historical failed vehicles to determine whether the cause of the current vehicle with a flywheel housing failure is the vehicle configuration or the vehicle speed condition; wherein the preliminary information of historical failed vehicles is information on the flywheel housing cracking failure caused by the preliminary vehicle information within a preset historical time period; When the fault is not caused by the vehicle configuration and speed condition, the flywheel housing material information of the vehicle with the flywheel housing fault is obtained, and then it is determined whether the fault is caused by the material; When the cause of the failure is not due to material reasons, a three-dimensional geometric model of the powertrain of the vehicle with the flywheel housing failure is obtained, and then the static strength value of the flywheel housing under the impact loads in several preset directions is simulated by using simulation software; it is determined whether the cause of the failure is that the static strength value does not meet the preset static strength conditions; wherein the powertrain at least includes an engine, a gearbox, a clutch housing, and a flywheel housing; When the static strength value meets the preset static strength condition, the preset analysis software is called to obtain the limit load of the flywheel housing, and then the fatigue strength of the flywheel housing is obtained based on the ratio of the limit load to the preset allowable load; determine whether the cause of the fault is that the fatigue strength of the flywheel housing does not meet the preset fatigue strength condition; When the fatigue strength of the flywheel housing meets the preset fatigue strength condition, the stress-strain test is started, and the maximum peak stress of the flywheel housing is obtained through a number of measuring points arranged on the flywheel housing; it is determined whether the cause of the failure is that the maximum peak stress does not meet the preset peak stress condition; When the maximum peak stress meets the preset peak stress condition, the natural frequency of the engine and the natural frequency of the gearbox under the simulation of the flywheel housing fault vehicle are obtained, and the first-order excitation frequency of the transmission shaft is calculated based on the historical operation data of the faulty vehicle; The powertrain resonance frequency of the vehicle with flywheel housing failure is obtained, and then the excitation source of the powertrain resonance frequency is determined based on the relationship between the powertrain resonance frequency, the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the drive shaft; the cause of the failure or the excitation source of the powertrain resonance frequency is sent to the preset maintenance terminal.
2. The method for diagnosing engine flywheel housing cracking fault according to claim 1, characterized in that: Use the preliminary information of historical faulty vehicles to determine whether the cause of the current flywheel housing faulty vehicle is the vehicle configuration or vehicle speed condition, including: When the powertrain configuration is the same as the powertrain configuration in the preliminary information of the historical faulty vehicle, it is determined that the fault cause of the current flywheel housing faulty vehicle is the vehicle configuration; When the historical speed of the most frequently occurring faulty vehicle with flywheel housing fault in a preset historical operating time period is the same as the historical speed of the faulty vehicle in the preliminary information of historical faulty vehicles, it is determined that the fault cause of the current flywheel housing faulty vehicle is the vehicle speed condition.
3. The method for diagnosing engine flywheel housing cracking fault according to claim 1, characterized in that: Obtain a three-dimensional geometric model of the powertrain of the vehicle with the flywheel housing failure, and then use simulation software to simulate the static strength value of the flywheel housing under impact loads in several preset directions; determine whether the cause of the failure is that the static strength value does not meet the preset static strength conditions, including: The gravity acceleration is applied to the three orthogonal directions of x, y and z of the three-dimensional geometric model by using simulation software to simulate and obtain the static strength value of the flywheel housing under the impact load in different directions; When the static strength value is within the preset static strength reasonable range, it is determined that the static strength value meets the preset static strength condition; When the static strength value is not within the preset static strength reasonable range, it is determined that the static strength value does not meet the preset static strength condition.
4. The method for diagnosing engine flywheel housing cracking fault according to claim 1, characterized in that: Calling the preset analysis software to obtain the limit load of the flywheel housing, and then obtaining the fatigue strength of the flywheel housing based on the ratio of the limit load to the preset allowable load; Determine whether the cause of the failure is that the fatigue strength of the flywheel housing does not meet the preset fatigue strength conditions, including: The ultimate load of the flywheel housing is obtained through the Trans MAX channel of the FEMFAT software; Based on the ratio of the limit load to the preset allowable load, the fatigue strength of the flywheel housing is obtained; When the fatigue strength of the flywheel housing is less than a preset strength, it is determined that the fatigue strength of the flywheel housing does not meet the preset fatigue strength condition.
5. The method for diagnosing engine flywheel housing cracking fault according to claim 1, characterized in that: The maximum peak stress of the flywheel housing is obtained by arranging several measuring points on the flywheel housing, including: By arranging a number of measuring points on the flywheel housing, the maximum peak stress on the flywheel housing that can be collected by the measuring points at a preset high speed is obtained.
6. The method for diagnosing engine flywheel housing cracking fault according to claim 1, characterized in that: According to the historical operation data of the faulty vehicle, the first-order excitation frequency of the transmission shaft is calculated, including: According to the formula: ， ， The first-order excitation frequency f of the transmission shaft is obtained by calculation; wherein the historical operation data of the faulty vehicle at least includes: Drive shaft speed, Engine speed, The highest speed ratio of the transmission.
7. The method for diagnosing engine flywheel housing cracking fault according to claim 1, characterized in that: Based on the relationship between the powertrain resonant frequency, the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the transmission shaft, the excitation source of the powertrain resonant frequency is determined, including: Calculate the difference between the powertrain resonance frequency and the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the transmission shaft in sequence; The frequency with the smallest difference is determined as the excitation source of the powertrain resonant frequency.
8. The method for diagnosing engine flywheel housing cracking fault according to claim 1, characterized in that: After determining the excitation source of the powertrain resonant frequency, the method further includes: Obtain the yield strength S of the flywheel housing material, J environmental factors, and the equivalent stress peak value of the flywheel housing , Design life cycle number , Material preset constants , the cracking preset constant corresponding to the jth environmental factor , the quantitative value of the jth environmental factor ; By formula: ， , calculate the remaining fatigue life ;in, Indicates the current loop number, and ∈(1, ).
9. A diagnostic system for engine flywheel housing cracking fault, characterized in that: The system comprises: The first diagnostic module is used to obtain preliminary vehicle information of the vehicle with flywheel housing failure; wherein the preliminary vehicle information at least includes: powertrain configuration and historical vehicle speed of the faulty vehicle, and then use the preliminary information of historical faulty vehicles to determine whether the fault cause of the current vehicle with flywheel housing failure is the vehicle configuration or the vehicle speed condition; The second diagnostic module is used to obtain the flywheel housing material information of the vehicle with the flywheel housing fault when the fault cause is not the vehicle configuration and the vehicle speed condition, and then determine whether the fault cause is the material reason; when the fault cause is not the material reason, obtain the three-dimensional geometric model of the powertrain of the vehicle with the flywheel housing fault, and then use the simulation software to simulate the static strength value of the flywheel housing under the impact loads in several preset directions; determine whether the fault cause is that the static strength value does not meet the preset static strength conditions; wherein the powertrain at least includes an engine, a gearbox, a clutch housing, and a flywheel housing; when the static strength value meets the preset static strength conditions, call the preset analysis software to obtain the limit load of the flywheel housing, and then obtain the fatigue strength of the flywheel housing based on the ratio of the limit load to the preset allowable load; determine whether the fault cause is that the fatigue strength of the flywheel housing does not meet the preset fatigue strength conditions; The third diagnostic module is used to start the stress-strain test when the fatigue strength of the flywheel housing meets the preset fatigue strength condition, and obtain the maximum peak stress of the flywheel housing through a number of measuring points arranged on the flywheel housing; determine whether the cause of the fault is that the maximum peak stress does not meet the preset peak stress condition; when the maximum peak stress meets the preset peak stress condition, obtain the engine natural frequency and the gearbox natural frequency under the simulation of the flywheel housing faulty vehicle, and calculate the first-order excitation frequency of the drive shaft according to the historical operation data of the faulty vehicle; obtain the powertrain resonance frequency of the flywheel housing faulty vehicle, and then determine the excitation source of the powertrain resonance frequency based on the relationship between the powertrain resonance frequency, the engine natural frequency, the gearbox natural frequency, and the first-order excitation frequency of the drive shaft; send the cause of the fault or the excitation source of the powertrain resonance frequency to a preset maintenance terminal.
10. A non-volatile computer storage medium, characterized in that: Computer instructions are stored thereon, and when the computer instructions are executed, a method for diagnosing a cracking fault of an engine flywheel housing as described in any one of claims 1 to 8 is implemented.