Fault symptom recognition system, and fault symptom recognition method

Abstract

To identify a member in which abnormality has occurred, and diagnosis a symptom of a fault of a target member formed of a plurality of components while reducing measurement data to be collected.SOLUTION: A fault symptom diagnostic system 1 includes a fault symptom recognition unit 13 configured to recognize a fault symptom of a component of a movable unit 160. The fault symptom recognition unit 13 executes first monitoring processing of repeatedly executing acoustic emission measuring processing and determining whether or not a first determination condition under which a number of times of detecting acoustic emission waves is equal to or larger than a predetermined number of times of determination is established, and when the first determination condition is established, ends the first monitoring processing and executes second monitoring processing of repeatedly executing vibration measuring processing of acquiring vibration detection information by a vibration detection information acquisition unit and recognizing a vibration level of the component on the basis of the vibration detection information, and recognizing a fault symptom of the component on the basis of magnitude of an increase in the vibration level of the component.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a failure sign recognition system and a failure sign recognition method. [Background technology]

[0002] Conventionally, a diagnostic device has been proposed that determines abnormalities in engine components based on the maximum amplitude value of a sound wave signal detected from acoustic emission waves generated from the engine components while the engine is running (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6373012 Summary of the Invention [Problem to be solved by the invention]

[0004] When diagnosing an abnormality in a target component by measuring acoustic emissions, as in the diagnostic device of the background art described above, there is the disadvantage that it is not possible to identify the component in which the abnormality has occurred when the target component is composed of multiple components, such as an electric power transmission unit mounted on a vehicle. Therefore, it is conceivable to identify the component in which the abnormality has occurred by measuring vibrations, but in this case, the abnormality in the component is determined based on changes in vibrations from the initial stage of use of the target component, which requires a large-scale data processing system capable of collecting and storing vibration measurement data. The present application has been made in light of this background, and aims to provide a failure sign recognition system and a failure sign recognition method that can identify and diagnose abnormal components in a target component made up of multiple parts, while reducing the amount of measurement data collected. [Means for solving the problem]

[0005] As a first aspect for achieving the above object, a failure sign determination system monitors an operating state of a movable unit composed of a plurality of parts to determine a failure sign of the parts, the system comprising: an acoustic emission detection information acquisition unit that acquires acoustic emission detection information indicating a detection status of an acoustic emission wave generated from the movable unit by an acoustic emission sensor; a vibration detection information acquisition unit that acquires vibration detection information indicating a detection status of vibration generated in the parts by a vibration sensor; and a failure sign recognition unit that recognizes a failure sign of the parts based on the acoustic emission detection information and the vibration detection information, wherein the failure sign recognition unit detects the acoustic emission wave by the acoustic emission detection information acquisition unit after use of the movable unit has started, and a second monitoring process that acquires the vibration detection information and repeatedly executes an acoustic emission measurement process that recognizes whether or not the acoustic emission waves have been detected based on the acoustic emission detection information, and determines whether or not a first determination condition is met, in which the number of times the acoustic emission waves have been detected by the acoustic emission measurement process is equal to or greater than a predetermined number of determinations. When the first determination condition is met, the first monitoring process is terminated, and the vibration detection information acquisition unit acquires the vibration detection information and repeatedly executes a vibration measurement process that recognizes the vibration level of the component based on the vibration detection information, and determines whether or not a failure sign of the component is being detected based on the degree of increase in the vibration level of the component.

[0006] In the above-described failure sign diagnosis system, the failure sign recognition unit may be configured to repeatedly execute the acoustic emission measurement process in the second monitoring process, determine whether a second judgment condition is met, whereby the frequency at which the acoustic emission waves are detected is equal to or greater than a predetermined judgment frequency and the vibration level of the component recognized by the vibration measurement process is equal to or greater than a predetermined judgment level, and, when the second judgment condition is met, terminate the second monitoring process, and repeatedly execute only the vibration measurement process without executing the acoustic emission measurement process, and execute a third monitoring process in which a failure sign of the component is recognized based on the degree of increase in the vibration level of the component recognized by the vibration measurement process.

[0007] In the above failure sign system, the failure sign recognition unit may be configured to execute the acoustic emission measurement process for each predetermined measurement cycle during a part of the measurement cycle in the first monitoring process.

[0008] As a second aspect for achieving the above object, there is provided a failure sign determination method for determining a failure sign of a part by monitoring an operating state of a movable unit made up of a plurality of parts by a computer, the method including: an acoustic emission detection information acquisition step for acquiring acoustic emission detection information indicating a detection status of an acoustic emission wave generated from the movable unit by an acoustic emission sensor; a vibration detection information acquisition step for acquiring vibration detection information indicating a detection status of vibration generated in the part by a vibration sensor; and a failure sign recognition step for recognizing a failure sign of the part based on the acoustic emission detection information and the vibration detection information, wherein the failure sign recognition step is performed by detecting a failure sign of the part by the acoustic emission detection information acquisition step after starting use of the movable unit. An example of a failure sign diagnosis method includes: repeatedly executing an acoustic emission measurement process that acquires acoustic emission detection information and recognizes whether or not the acoustic emission waves have been detected based on the acoustic emission detection information; executing a first monitoring process that determines whether or not a first judgment condition is met, in which the number of times the acoustic emission waves have been detected by the acoustic emission measurement process is equal to or greater than a predetermined judgment number; when the first judgment condition is met, terminating the first monitoring process; acquiring the vibration detection information by the vibration detection information acquisition step; repeatedly executing a vibration measurement process that recognizes the vibration level of the component based on the vibration detection information; and executing a second monitoring process that recognizes a failure sign of the component based on the degree of increase in the vibration level of the component. [Effects of the Invention]

[0009] According to the above-described failure sign diagnosis system and failure sign diagnosis method, it is possible to identify and diagnose the component in which an abnormality has occurred while reducing the amount of measurement data collected and detecting failure signs of a target component made up of multiple parts. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram of the configuration of a failure sign diagnosis system. [Figure 2] FIG. 2 is an illustration of a mode of measuring acoustic emission waves and vibrations for a power transmission unit. [Figure 3] FIG. 3 is a timing chart of the process for monitoring the operating state of the power transmission unit. [Figure 4] FIG. 4 is a first flowchart of a failure sign diagnosis process for a power transmission unit. [Figure 5] FIG. 5 is a second flowchart of the power transmission unit failure sign diagnosis process. DETAILED DESCRIPTION OF THE INVENTION

[0011] [1. Configuration of the failure sign diagnosis system] The configuration of a failure sign diagnosis system 1 of this embodiment will be described with reference to Figures 1 and 2. The failure sign diagnosis system 1 monitors the operating state of a power transmission unit 160 provided in a vehicle 100 traded at a car dealer 300, and performs processing to diagnose failure signs in the components that make up the power transmission unit 160.

[0012] Transactions include new car sales, used car sales, vehicle lease contracts, etc. The power transmission unit 160 corresponds to the movable unit in this disclosure. The failure sign diagnosis system 1 is a computer system including a processor 10, a memory 20, a communication unit 30, etc. The failure sign diagnosis system 1 communicates with a vehicle control device 110 installed in a vehicle 100, a user terminal 50 used by a user U, a vehicle manufacturer server 210, a store management system 310 installed in a car dealership 300, etc. via a communication network 200 using the communication unit 30.

[0013] 2, the vehicle 100 includes a motor 150 as a drive source, a power transmission unit 160 that transmits the driving force of the motor 150 to wheels 151, and a vehicle control device 110 that controls the operation of the vehicle 100. The vehicle 100 also includes an acoustic emission sensor 161 that detects acoustic emission waves that are generated when roughness, cracks, flaking, etc. occur in the power transmission unit 160, and a plurality of vibration sensors 162 that detect vibrations generated in each of the components (bearings, gears, etc.) that make up the power transmission unit 160. In FIG. 2, three vibration sensors 162a, 162b, and 162c are shown as examples of the vibration sensors 162.

[0014] Hereinafter, acoustic emission will also be referred to as AE (Acoustic Emission). Furthermore, vibration sensors 162a, 162b, and 162c will be collectively referred to as vibration sensor 162. Vibration sensor 162 detects vibrations, for example, in three axial directions (left-right, up-down, and front-rear directions). AE sensor 161 and vibration sensor 162 are connected to vehicle control device 110, and detection signals from AE sensor 161 and vibration sensor 162 are input to vehicle control device 110.

[0015] The vehicle control device 110 includes a processor 111, a memory 112, a communication unit 114, etc., and controls the operation of the vehicle 100 by having the processor 111 read and execute a control program 113 for the vehicle control device 110 stored in the memory 112. The vehicle control device 110 transmits, via the communication unit 114, AE detection information AEi indicating the detection status of AE waves by the AE sensor 161 and vibration detection information VBi indicating the detection status of component vibrations by the vibration sensor 162 to the failure sign diagnosis system 1.

[0016] The vehicle control device 110 also transmits vehicle usage information CUi indicating the usage status (mileage, driving route, driving operation status, etc.) of the vehicle 100 to the vehicle manufacturer server 210. The store management system 310 and the service staff terminal 60 used by the service staff V of the car dealer 300 transmit maintenance information MTi indicating the details of the maintenance of the vehicle 100 performed by the car dealer 300 to the vehicle manufacturer server 210.

[0017] The vehicle manufacturer server 210 receives vehicle usage information CUi transmitted from the vehicle 100 and maintenance information MTi transmitted from the store management system 310, and records the vehicle usage information CUi and maintenance information MTi in the vehicle management DB 211. Note that, for the sake of convenience of explanation, one vehicle 100 and one car dealer 300 are shown in FIG. 1, but in reality, the vehicle manufacturer server 210 communicates between multiple vehicles and the car dealer's store management system, receives vehicle usage information CUi and maintenance information MTi for each of multiple vehicles that it manages, and records them in the vehicle management DB 211.

[0018] The memory 20 of the failure sign diagnosis system 1 stores a program 21 for controlling the failure sign diagnosis system 1 and data for a component vibration / failure sign determination map 22 that associates the degree of increase in vibration level of components constituting the power transmission unit 160 with the component failure sign level. The component vibration / failure sign determination map 22 is created from correspondence data between the degree of increase in component vibration measured in the past and the failure sign level, computer simulation, etc.

[0019] By loading and executing program 21, processor 10 functions as an AE detection information acquisition unit 11, a vibration detection information acquisition unit 12, and a failure sign recognition unit 13. The processing executed by AE detection information acquisition unit 11 corresponds to the AE detection information acquisition step in the failure sign diagnosis method of the present disclosure, and the processing executed by vibration detection information acquisition unit 12 corresponds to the vibration detection information acquisition step in the failure margin diagnosis method of the present disclosure. The processing executed by failure sign recognition unit 13 corresponds to the failure sign recognition step in the failure sign diagnosis method of the present disclosure.

[0020] The AE detection information acquisition unit 11 receives and acquires the AE detection information AEi from the vehicle 100 by communicating with the vehicle 100 via the communication unit 30. The vibration detection information acquisition unit 12 receives and acquires the vibration detection information VBi from the vehicle 100 by communicating with the vehicle 100 via the communication unit 30.

[0021] The failure sign recognition unit 13 recognizes failure signs of the components that make up the power transmission unit 160 by monitoring the detection status of AE waves generated from the power transmission unit 160 of the vehicle 100 and the vibration status of the components of the power transmission unit 160 based on the AE detection information AEi acquired by the AE detection information acquisition unit 11 and the vibration detection information VBi acquired by the vibration detection information acquisition unit 12.

[0022] For ease of explanation, Figure 1 shows a situation in which the failure sign diagnosis system 1 diagnoses failure signs of components that make up the power transmission unit 160 for one vehicle 100, but in reality, the failure sign diagnosis system 1 communicates with multiple vehicles and diagnoses component failures for each power transmission unit installed in each vehicle.

[0023] 1, the failure sign diagnosis system 1 receives the AE detection information AEi and the vibration detection information VBi through communication with the vehicle 100, but the AE detection information AEi and the vibration detection information VBi may be transmitted from the vehicle 100 to the vehicle manufacturer server 210, and the AE detection information AEi and the vibration detection information VBi may be recorded in the vehicle management DB 211. In this case, the failure sign diagnosis system 1 accesses the vehicle manufacturer server 210 and receives the AE detection information AEi and the vibration detection information VBi recorded in the vehicle management DB 211.

[0024] [2. Failure Prediction Diagnosis Processing] The procedure for the failure sign determination process for components constituting the power transmission unit 160 of the vehicle 100, which is executed by the failure sign diagnosis system 1, will be described below in accordance with the flowcharts shown in Figures 4 and 5, with reference to the timing chart shown in Figure 3.

[0025] FIG. 4 shows, on the time axis t, the execution timing of an AE measurement process that measures the presence or absence of AE waves generated from the power transmission unit 160 of the vehicle 100 based on AE detection information AEi acquired by the AE detection information acquisition unit 11, and a vibration measurement process that measures vibrations of the components that make up the power transmission unit 160 of the vehicle 100 based on vibration detection information VBi acquired by the vibration detection information acquisition unit 12.

[0026] 4, the failure sign recognition unit 13 acquires AE detection information AEi from the vehicle 100 every minute (corresponding to the measurement cycle in the present disclosure) using the AE detection information acquisition unit 11, and executes AE measurement processing. In the following step S2, if an AE wave is detected by the AE measurement processing, the failure sign recognition unit 13 proceeds to step S3, and if an SE wave is not detected by the AE measurement processing, the failure sign recognition unit 13 proceeds to step S1.

[0027] In step S3, the failure sign recognition unit 13 increments (+1) the number of times AE waves have been detected, and in the next step S4, it determines whether the number of times AE waves have been detected has reached or exceeded the determination number. If the number of times AE waves have been detected has reached or exceeded the determination number, the failure sign recognition unit 13 proceeds to step S5 and step S20, and if the number of times AE waves have been detected is less than the determination number, it proceeds to step S1.

[0028] As shown in Fig. 3, steps S1 to S4 (first monitoring process) perform only the AE measurement process, and not the vibration measurement process, from t0, when monitoring of the power transmission unit 160 of the vehicle 100 begins, until t2, when the number of AE wave detections reaches or exceeds the determination number, after passing t1, when the AE wave is first detected. The AE measurement process is performed every minute, and the required time for the AE measurement process is approximately tens to hundreds of milliseconds, reducing the amount of data to be collected, stored, and processed. This eliminates the need for a large-scale data processing system capable of collecting, storing, and processing large amounts of data.

[0029] The failure sign recognition unit 13 executes the processes of steps S5 to S8 and steps S20 to S21 in parallel. The processes of steps S5 to S8 are executed for each component whose vibration is individually detected by the multiple vibration sensors 162 provided in the power transmission unit 160. In step S5, the failure sign recognition unit 13 acquires vibration detection information VBi from the vehicle 100 using the vibration detection information acquisition unit 12, and executes vibration measurement processing. In the following step S6, the failure sign recognition unit 13 recognizes the degree of increase in the vibration level of the component from the time the vibration measurement started (t2 in FIG. 3).

[0030] In the next step S7, the failure sign recognition unit 13 applies the degree of increase in the vibration level of the component to the component vibration / failure sign determination map 22 (see FIG. 1) to recognize the failure sign level of the component. In the following step S8, the failure sign recognition unit 13 determines whether or not maintenance of the component is necessary based on the failure sign level of the component. If maintenance of the component is necessary, the failure sign recognition unit 13 then proceeds to step S14 in FIG. 5 and transmits maintenance recommendation information MRi recommending the performance of maintenance to the user terminal 50, thereby prompting the user U to have maintenance performed on the power transmission unit 160.

[0031] The maintenance recommendation information MRi may be transmitted to the vehicle control device 110, and an image recommending maintenance may be displayed on a display device provided in the vehicle 100. Alternatively, the maintenance recommendation information MRi may be transmitted to the store management system 310, and the service representative V may contact the user U to recommend maintenance.

[0032] On the other hand, if it is determined that maintenance of the part is not yet necessary, the failure sign recognition unit 13 proceeds to step S9. Furthermore, in step S20, the failure sign recognition unit 13 acquires AE detection information AEi from the vehicle 100 every minute using the AE detection information acquisition unit 11, and performs AE measurement. In the following step S2, the failure sign recognition unit 13 recognizes the detection frequency of AE waves in the AE measurements (the proportion of AE measurements in which AE waves were detected out of a predetermined number of AE measurements), and proceeds to step S9.

[0033] In step S9, the failure sign recognition unit 13 determines whether a second determination condition is met, where the measured vibration level of the component is equal to or greater than the determination level and the detection frequency of AE waves is equal to or greater than the determination frequency. If the second determination condition is met, the failure sign recognition unit 13 proceeds to step S10 in Fig. 5, and if the second determination condition is not met, the failure sign recognition unit 13 proceeds to step S5.

[0034] 3, the vibration measurement process is started at time t2 when the number of times AE waves are detected exceeds the determination number and it is estimated that deterioration of the power transmission unit 160 has progressed, as a result of the processes in steps S5 to S9 and steps S20 to S21 (second monitoring process). Then, during the period from t2 to t3, the AE measurement process and the vibration measurement process are executed, and the frequency of AE wave detection by the AE measurement process and the vibration level of the components of the power transmission unit 160 by the vibration measurement process are monitored.

[0035] In the second monitoring process, the vibration measurement process makes it possible to identify and recognize signs of failure in components that make up the power transmission unit 160. Furthermore, the frequency of AE wave detection in the AE measurement process makes it possible to recognize an increasing possibility of a failure occurring in the power transmission unit 160.

[0036] 5, the failure sign recognition unit 13 acquires the vibration detection information VBi from the vehicle 100 using the vibration detection information acquisition unit 12, and executes a vibration measurement process. In the following step S11, the failure sign recognition unit 13 recognizes the degree of increase in the vibration level of the part from the time the vibration measurement process started (t2 in FIG. 3).

[0037] In the next step S12, the failure sign recognition unit 13 applies the degree of increase in the vibration level of the component to the component vibration / failure sign determination map 22 (see FIG. 1) to recognize the failure sign level of the component. In the following step S13, the failure sign recognition unit 13 determines whether maintenance of the component is necessary based on the failure sign level of the component.

[0038] If the failure sign recognition unit 13 determines that maintenance of the component is necessary, the unit proceeds to step S14, where it transmits maintenance recommendation information MRi recommending the performance of maintenance to the user terminal 50, thereby prompting the user U to perform maintenance on the power transmission unit 160. On the other hand, if it determines that maintenance of the component is not necessary, the failure sign recognition unit 13 proceeds to step S10, where it continues monitoring the vibration levels of the components that make up the power transmission unit 160.

[0039] As shown in FIG. 3, by the processing of steps S10 to S13 (third monitoring processing), when the second judgment condition is met and the frequency of AE wave detection increases, the likelihood of a failure occurring in the power transmission unit 160 continues, and it can be estimated that the increased vibration level has increased the likelihood of a component failure, the AE measurement processing is terminated and monitoring continues using only the vibration measurement processing.

[0040] 3. Other Embodiments In the above embodiment, the power transmission unit 160 provided in the vehicle 100 is exemplified as the movable unit of this embodiment, but the movable unit of this embodiment may be any movable unit capable of measuring AE waves and vibrations. For example, it may be a moving body other than a vehicle (such as an aircraft or a ship).

[0041] 3, monitoring of the operating state of the power transmission unit 160 begins at time t0 when use of the power transmission unit 160 begins, with a first monitoring process that performs only AE measurement without vibration measurement, and at time t2 when the first determination condition is met, the process switches to a second monitoring process that performs both vibration and AE measurement, and at time t3 when the second determination condition is met, the process switches to a third monitoring process that performs only vibration measurement without AE measurement. In another embodiment, after switching from the first monitoring process to the second monitoring process, the second monitoring process may be continued to monitor the operating state of the power transmission unit 160 without determining whether the second determination condition is met.

[0042] In the above embodiment, an example has been shown in which the failure sign diagnosis system of the present disclosure is configured as a failure sign diagnosis system 1 that communicates with the vehicle 100. As another configuration, the failure sign diagnosis system of the present disclosure may be configured to be provided in the vehicle 100. Furthermore, the failure sign diagnosis system of the present disclosure may be configured as part of the functions of the vehicle manufacturer server 210 or the store management system 310.

[0043] 1 is a schematic diagram showing the configuration of the failure sign diagnosis system 1 divided by main processing content to facilitate understanding of the present invention, but the failure sign diagnosis system 1 may be divided into other sections. Furthermore, the processing of each component may be executed by one hardware unit or multiple hardware units. Furthermore, the processing of each component shown in FIGS. 4 and 5 may be executed by one program or multiple programs.

[0044] 4. Configurations supported by the above embodiments The above embodiment is a specific example of the following configuration.

[0045] (Configuration 1) A failure sign determination system that monitors the operating state of a movable unit made up of a plurality of parts and determines a failure sign of the parts, comprising: an acoustic emission detection information acquisition unit that acquires acoustic emission detection information indicating a detection status of acoustic emission waves generated from the movable unit by an acoustic emission sensor; a vibration detection information acquisition unit that acquires vibration detection information indicating a detection status of vibrations generated in the parts by a vibration sensor; and a failure sign recognition unit that recognizes a failure sign of the parts based on the acoustic emission detection information and the vibration detection information, wherein the failure sign recognition unit recognizes a failure sign of the parts based on the acoustic emission detection information and the vibration detection information, and a first monitoring process that determines whether a first determination condition is met, in which the number of times the acoustic emission wave is detected by the acoustic emission measurement process is equal to or greater than a predetermined number of determinations; and when the first determination condition is met, the first monitoring process is terminated, the vibration detection information acquisition unit acquires the vibration detection information, and the vibration measurement process that recognizes the vibration level of the component based on the vibration detection information; and a second monitoring process that recognizes a failure sign of the component based on the degree of increase in the vibration level of the component. According to the failure sign diagnosis system of configuration 1, after the start of use of the movable unit, until it is estimated that the possibility of failure of the movable unit has increased to a certain extent due to the first determination condition being satisfied, only the acoustic emission measurement process is performed by the first monitoring process, thereby making it possible to reduce the load of collecting and processing measurement data compared to the case where the vibration measurement process is performed from the start of use of the movable unit. Then, after the first determination condition is satisfied, it is possible to identify parts and diagnose failure signs by performing the vibration measurement process.

[0046] (Configuration 2) The failure sign recognition unit executes the failure sign diagnosis system described in Configuration 1, in the second monitoring process, repeatedly executing the acoustic emission measurement process to determine whether a second judgment condition is met, whereby the frequency at which the acoustic emission waves are detected is equal to or greater than a predetermined judgment frequency and the vibration level of the part recognized by the vibration measurement process is equal to or greater than a predetermined judgment level, and when the second judgment condition is met, terminates the second monitoring process, does not execute the acoustic emission measurement process, and repeatedly executes only the vibration measurement process to recognize a failure sign of the part based on the degree of increase in the vibration level of the part recognized by the vibration measurement process. According to the failure sign diagnosis system of configuration 2, when the second judgment condition is met and it is estimated that the possibility of the deterioration of the movable unit progressing has further increased, the acoustic emission measurement process is terminated and switched to the third monitoring process that executes only the vibration measurement process, thereby reducing the load on collection and processing of measurement data.

[0047] (Configuration 3) A failure sign diagnosis system according to Configuration 1 or 2, wherein the failure sign recognition unit executes the acoustic emission measurement process for a portion of a predetermined measurement cycle during the first monitoring process. According to the failure sign diagnosis system of configuration 3, by setting the interval for executing the acoustic emission measurement process to be longer than the time required for the acoustic emission measurement process, the acoustic emission measurement process can be performed intermittently, thereby reducing the load of data collection and data processing due to the acoustic emission measurement process.

[0048] (Configuration 4) A failure sign determination method for determining a failure sign of a part by monitoring the operating state of a movable unit composed of a plurality of parts by a computer, the method including: an acoustic emission detection information acquisition step for acquiring acoustic emission detection information indicating a detection status of an acoustic emission wave generated from the movable unit by an acoustic emission sensor; a vibration detection information acquisition step for acquiring vibration detection information indicating a detection status of vibration generated in the part by a vibration sensor; and a failure sign recognition step for recognizing a failure sign of the part based on the acoustic emission detection information and the vibration detection information, wherein the failure sign recognition step is performed by detecting a failure sign of the acoustic emission wave by the acoustic emission detection information acquisition step after the movable unit has started to be used. a first monitoring process for determining whether a first determination condition is met, in which the number of times the acoustic emission wave is detected by the acoustic emission measurement process is equal to or greater than a predetermined number of determinations; and, when the first determination condition is met, the first monitoring process is terminated, and the vibration detection information is acquired by the vibration detection information acquisition step, and a vibration measurement process for recognizing a vibration level of the component based on the vibration detection information is repeatedly executed; and a second monitoring process for recognizing a sign of failure of the component based on a degree of increase in the vibration level of the component. By executing the failure sign diagnosis method of configuration 4 by a computer, the same effects as those of the failure sign diagnosis method of configuration 1 can be obtained. [Explanation of symbols]

[0049] 1...failure sign diagnosis system, 10...processor, 11...AE detection information acquisition unit, 12...vibration detection information acquisition unit, 13...failure sign recognition unit, 20...memory, 21...program, 22...component vibration / failure sign determination map, 30...communication unit, 50...user terminal, 60...service staff terminal, 100...vehicle, 110...vehicle control device, 160...power transmission unit, 161...AE sensor, 162...vibration sensor, 200...communication network, 210...vehicle manufacturer server, 211...vehicle management DB, 300...car dealer, 310...store management system, U...user, V...service staff

Claims

1. A failure sign determination system that monitors an operating state of a movable unit composed of a plurality of parts and determines a failure sign of the parts, an acoustic emission detection information acquisition unit that acquires acoustic emission detection information indicating a detection status of an acoustic emission wave generated from the movable unit by an acoustic emission sensor; a vibration detection information acquisition unit that acquires vibration detection information indicating a detection status of vibrations occurring in the component by a vibration sensor; a failure sign recognition unit that recognizes a failure sign of the component based on the acoustic emission detection information and the vibration detection information, The failure sign recognition unit after starting to use the movable unit, acquiring the acoustic emission detection information by the acoustic emission detection information acquisition unit, repeatedly executing an acoustic emission measurement process that recognizes whether or not the acoustic emission wave has been detected based on the acoustic emission detection information, and executing a first monitoring process that determines whether or not a first determination condition is established, that is, whether or not the number of times the acoustic emission wave has been detected by the acoustic emission measurement process is equal to or greater than a predetermined determination number; When the first determination condition is met, the first monitoring process is terminated, the vibration detection information acquisition unit acquires the vibration detection information, and a vibration measurement process is repeatedly executed to recognize a vibration level of the component based on the vibration detection information, and a second monitoring process is executed to recognize a failure sign of the component based on an increase in the vibration level of the component. Predictive fault diagnosis system.

2. The failure sign recognition unit In the second monitoring process, the acoustic emission measurement process is repeatedly executed, and it is determined whether or not a second determination condition is established, in which the frequency at which the acoustic emission wave is detected is equal to or greater than a predetermined determination frequency, and the vibration level of the component recognized by the vibration measurement process is equal to or greater than a predetermined determination level, and When the second determination condition is met, the second monitoring process is terminated, and the acoustic emission measurement process is not performed, but only the vibration measurement process is repeatedly performed, and a third monitoring process is performed in which a failure sign of the component is recognized based on the degree of increase in the vibration level of the component recognized by the vibration measurement process. The failure sign diagnosis system according to claim 1 .

3. In the first monitoring process, the failure sign recognition unit executes the acoustic emission measurement process for each predetermined measurement cycle during a part of the measurement cycle.

3. The failure sign diagnosis system according to claim 1 or 2.

4. A failure sign determination method for determining a failure sign of a movable unit including a plurality of parts by monitoring an operating state of the movable unit using a computer, the method comprising: an acoustic emission detection information acquisition step of acquiring acoustic emission detection information indicating a detection status of an acoustic emission wave generated from the movable unit by an acoustic emission sensor; a vibration detection information acquisition step of acquiring vibration detection information indicating a detection status of vibration occurring in the component by a vibration sensor; a failure sign recognition step of recognizing a failure sign of the component based on the acoustic emission detection information and the vibration detection information, The failure sign recognition step includes: after starting to use the movable unit, acquiring the acoustic emission detection information in the acoustic emission detection information acquisition step, and repeatedly executing an acoustic emission measurement process that recognizes whether or not the acoustic emission wave has been detected based on the acoustic emission detection information, and executing a first monitoring process that determines whether or not a first determination condition is established, that is, the number of times the acoustic emission wave has been detected in the acoustic emission measurement process is equal to or greater than a predetermined determination number; When the first determination condition is met, the first monitoring process is terminated, the vibration detection information acquisition step acquires the vibration detection information, and a vibration measurement process is repeatedly executed to recognize the vibration level of the component based on the vibration detection information, and a second monitoring process is executed to recognize a failure sign of the component based on the degree of increase in the vibration level of the component. A method for diagnosing signs of failure.

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