Recording device

Abstract

The present invention provides a recording device that records information suitable for estimating the risk of failure of components installed in a vehicle. [Solution] A recording device 10 for recording information about a vehicle, comprising: a stress calculation unit 11 that acquires driving state information about the vehicle's driving state and calculates the stress on parts mounted on the vehicle based on the driving state information; and a stress information storage unit 12 that stores the acquired stress information for each part.

Description

Technical Field

[0001] This invention relates to a recording device that records information related to a vehicle.

Background Art

[0002] Conventionally, a device for recording information related to a vehicle has been known. In the stress state determination device of Patent Document 1, as information related to a vehicle, for example, the cooling water temperature of an in-vehicle motor drive inverter, the element temperature of the in-vehicle motor drive inverter, or the in-vehicle battery voltage acquired during traveling is recorded.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a need for a recording device that records information suitable for estimating the risk of failure of components mounted on a vehicle.

Means for Solving the Problems

[0005] Hereinafter, means for solving the above problems and their effects will be described. The recording device for solving the above problems includes a stress calculation unit that acquires driving state information related to the driving state of a vehicle and calculates the stress applied to components mounted on the vehicle based on the driving state information, and a stress information storage unit that stores stress information related to the calculated stress for each component. The gist thereof is that.

Effects of the Invention

[0006] According to the above configuration, it is possible to record information suitable for estimating the risk of failure of components installed in the vehicle. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram showing the configuration of the recording device. [Figure 2] Figures 2(a) and 2(b) are explanatory diagrams showing the data structure of stress information recorded in the recording device. [Modes for carrying out the invention]

[0008] An embodiment of the recording device will be described below with reference to Figures 1 and 2. <Recording device configuration> The recording device 10 shown in Figure 1 comprises a stress calculation unit 11 and a stress information storage unit 12. As an example, the recording device 10 includes a CPU and memory, and the CPU performs various processes described below based on the program stored in the memory. The recording device 10 may be mounted in the vehicle or located on a server outside the vehicle.

[0009] <Stress Calculation Section> The stress calculation unit 11 calculates the stress on one or more components mounted on the target vehicle. The stress calculation unit 11 is configured to acquire driving condition information regarding the driving conditions of the target vehicle. Based on the acquired driving condition information, the stress calculation unit 11 calculates the stress on the components mounted on the target vehicle.

[0010] For example, the component whose stress is to be calculated may be a component built into the engine of the vehicle in question. The component whose stress is to be calculated may be a crank bearing, but is not limited to this. For example, the stress calculated by the stress calculation unit 11 is the stress applied to a specific part of the component. However, the stress calculated by the stress calculation unit 11 may also be the amount of deformation or temperature of a specific part of the component.

[0011] The stress calculation unit 11 calculates the stress on each of the multiple components mounted on the target vehicle. The stress calculation unit 11 transmits the calculated stress information to the stress information storage unit 12. The stress information is information that can identify the stress on the components mounted on the target vehicle.

[0012] <How to calculate stress> The conditions under which the stress calculation unit 11 calculates the stress for each component may differ for each component. For example, the cycle for which the stress calculation unit 11 calculates the stress for each component may differ for each component.

[0013] For example, the stress calculation unit 11 may calculate the stress on each component by performing predetermined processing based on model data that describes the relationship between various variables included in the driving condition information and the stress on each component. For example, the various variables included in the model data used to calculate the stress on components built into the engine may include engine speed, engine load, engine auxiliary load, oil temperature, water temperature, and ambient temperature. Also, for example, the various variables included in the model data used to calculate the stress on components built into the engine may include friction estimates from ISC (Idle Speed ​​Control), oil and water temperatures at startup, and material temperatures estimated from the current operating conditions. Note that the various variables included in the model data are not limited to those mentioned above and can be changed as appropriate.

[0014] <Stress Information Storage Department> The stress information storage unit 12 stores the received stress information. The stress information storage unit 12 stores stress information for each of the multiple parts installed in the vehicle. As an example, the stress information storage unit 12 records the received stress information as histogram data.

[0015] FIG. 2(a) and FIG. 2(b) illustrate the data structure of the histogram data recorded in the stress information storage unit 12. As an example, the histogram data has the magnitude of the stress (hereinafter simply referred to as stress) applied to a specific part of the component on the horizontal axis, and the integrated number on the vertical axis. Such histogram data is generated by aggregating the stress values calculated based on the driving state information acquired at a predetermined cycle during vehicle driving. As an example, the histogram data is generated by classifying the magnitude of the stress into a plurality of classes and integrating the number of times the values included in each class are obtained as stress values.

[0016] FIG. 2(a) is the histogram data based on the stress information of the first component among the components mounted on the vehicle. FIG. 2(b) is the histogram data based on the stress information of the second component different from the first component among the components mounted on the vehicle.

[0017] <Operation of this Embodiment> In the recording device 10 of this embodiment, the data obtained by separately calculating and storing the stress information regarding the stress applied to each component mounted on the target vehicle for each component can be recorded as histogram data.

[0018] <Example of Utilizing Data> Hereinafter, an example of utilizing the data recorded in the recording device 10 will be described. Assuming that the failure of the component follows the linear cumulative damage rule, so-called Miner's rule, the component fails due to the accumulation of damage (fatigue) caused by the repeated application of stress (for example, stress) to the component. Therefore, the histogram data storing the stress information of the component recorded in the recording device 10 can be utilized to estimate the risk of component failure.

[0019] As an example, the failure risk of a component may be estimated by estimating the amount of damage D accumulated in the component based on the histogram data of the stress information of the components recorded in the recording device 10. As an example, the amount of damage D is calculated for each stress class in the histogram data, where the number of times the stress of each class is applied is n, and assuming that the component fails when the stress of each class is applied N times, the sum of n / N calculated for each class can be used for the estimation.

[0020] Also, as an example, the data recorded in the recording device 10 can be used to estimate the remaining life L of a component. In this case, to estimate the remaining life L of a component, the amount of damage D accumulated in the components of the target vehicle is estimated, and the mileage M of the target vehicle up to the present is specified. Then, the remaining life L can be estimated by finding the difference between the maximum life Lmax of the component calculated by the product of the reciprocal of the amount of damage D and the mileage M up to the present and the mileage M up to the present.

[0021] Furthermore, as an example, the data recorded in the recording device 10 can be used to investigate the cause of a component failure in a vehicle. In this case, the actual strength (hereinafter referred to as the actual strength) of the failed component is estimated from the data recorded in the recording device 10. Then, the cause of the failure can be investigated by comparing the estimated actual strength of the failed component with the designed strength or test results of the failed component. Also, when investigating the cause of the failure, the estimated actual strength and the histogram data of the components of each vehicle where no failure has occurred can be compared to estimate the remaining life L of the component or to determine the necessity of treatment for the target component. <00​​​​​​​(2) As described above, the histogram data recorded by the recording device 10 of this embodiment is useful for investigating the cause of a component failure when it occurs. In other words, the recording device 10 of this embodiment can record information suitable for investigating the cause of a component failure as one element for estimating the risk of component failure.

[0024] (3) As described above, the histogram data recorded by the recording device 10 of this embodiment is useful for estimating the amount of damage D accumulated in the component. That is, according to the recording device 10 of this embodiment, information suitable for estimating the amount of damage D accumulated in the component can be recorded as one element for estimating the risk of component failure.

[0025] (4) As described above, the histogram data recorded by the recording device 10 of this embodiment is useful for estimating the remaining lifespan L of a component. That is, the recording device 10 of this embodiment can record information suitable for estimating the remaining lifespan L of a component as one element for estimating the risk of component failure.

[0026] (5) According to this embodiment, by recording stress information as histogram data, a large amount of stress information can be stored in a small recording area, thus compressing the recording area of ​​the recording device 10 necessary for estimating the risk of failure of the target vehicle.

[0027] <Example of changes> This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0028] In the above embodiment, the model data can be generated by any generation method. For example, it may be generated based on the results of unit tests performed while varying various parameters, or it may be generated by simulation.

[0029] In the above embodiment, the method for calculating stress may be modified as appropriate. For example, the stress of each component may be calculated using a pre-trained model trained by supervised learning, which outputs the stress of each component when various variables included in the driving condition information are input. [Explanation of symbols]

[0030] 10...Recording device, 11...Stress calculation unit, 12...Stress information storage unit

Claims

[Claim 1] A recording device for recording information about a vehicle, A stress calculation unit acquires driving condition information regarding the vehicle's driving state and calculates the stress on the components mounted on the vehicle based on the driving condition information. The system includes a stress information storage unit that stores the calculated stress information for each component, Recording device.

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