In-vehicle device and transfer control method

Abstract

To transfer vehicle data as much as possible in emergency.SOLUTION: An information process system according to embodiments comprises an acquisition unit and a transfer control unit. The acquisition unit acquires various types of states of a vehicle in emergency. The transfer control unit controls compression processing in transfer processing of vehicle data on the basis of, a radio wave state and a memory state in a periphery of the vehicle included in the various types of states acquired by the acquisition unit.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The disclosed embodiments include an in-vehicle device and Transfer Control Regarding the method. [Background technology]

[0002] In the past, in order to grasp the situation in an emergency such as an accident, it was necessary to retrieve and analyze vehicle data recorded in an on-board device. On the other hand, since power lines to the vehicle power supply and the like are often disconnected in the event of an accident, the on-board device is often required to have an internal battery as an auxiliary power source.

[0003] In addition, it is essential that the on-board device be able to record and check various vehicle data when an accident occurs, and when an accident occurs, the on-board device attempts to transfer the vehicle data to a center server that collects and analyzes the vehicle data, for example, by wireless communication. However, if the accident causes, for example, a disconnection or a dead battery as described above, the transfer may fail.

[0004] To address these issues, a technology has been proposed that provides a function that allows the vehicle's remaining power supply to be selectively supplied to devices that the user needs, thereby ensuring sufficient power supply to operate devices that make emergency calls in an emergency (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2017 / 222058 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the prior art leaves room for further improvement in transferring as much vehicle data as possible in an emergency.

[0007] For example, when using the above-mentioned conventional technology, even if the power supply power required to operate the device that makes the emergency call is secured, if the radio wave conditions are poor, it becomes difficult to transfer vehicle data via wireless communication. Furthermore, when transferring vehicle data, the data is generally compressed, but if the memory area of the in-vehicle device for performing such compression in an emergency is insufficient, it becomes difficult to transfer vehicle data.

[0008] One aspect of the embodiment has been made in view of the above, and aims to provide an in-vehicle device and a data transfer method that can transfer as much vehicle data as possible in an emergency. [Means for solving the problem]

[0009] An in-vehicle device according to one aspect of an embodiment includes: The in-vehicle device includes a work memory area that can be used to compress vehicle data, and a transfer control unit that transfers acquired vehicle data to an external device in an emergency. When the radio wave conditions for communication with the external device are good and the work memory area has available capacity for compression, the transfer control unit transfers the acquired vehicle data to the external device as compressed vehicle data, and when the radio wave conditions for communication with the external device are good but the work memory area does not have enough available capacity for compression, the transfer control unit transfers the acquired vehicle data to the external device as is. [Effects of the Invention]

[0010] According to one aspect of the embodiment, vehicle data can be transferred as much as possible in an emergency. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram (part 1) outlining a data transfer method according to an embodiment. [Figure 2] FIG. 2 is a diagram (part 2) outlining the data transfer method according to the embodiment. [Figure 3] FIG. 3 is a diagram (part 3) outlining the data transfer method according to the embodiment. [Figure 4] FIG. 4 is a diagram illustrating an example of the configuration of a data transfer system according to the embodiment. [Figure 5] FIG. 5 is a block diagram showing an example of the configuration of the in-vehicle device according to the embodiment. [Figure 6] FIG. 6 is an explanatory diagram of the control content of the vehicle data transfer process. [Figure 7]FIG. 7 is a flowchart showing a processing procedure executed by the in-vehicle device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an in-vehicle device and a data transfer method disclosed in the present application will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments.

[0013] In the following description, when "vehicle V" is mentioned, it can be read as "on-vehicle device 10" as appropriate, and vice versa.

[0014] First, an outline of a data transfer method according to an embodiment will be described with reference to Fig. 1 to Fig. 3. Fig. 1 to Fig. 3 are diagrams (part 1) to (part 3) outlining the data transfer method according to an embodiment. Note that Fig. 1 shows a data transfer method according to a comparative example for comparison with this embodiment.

[0015] 1, a data transfer system 1' according to the comparative example is a system in which an in-vehicle device 10 transfers vehicle data to a center server 100 by wireless communication or the like in the event of an emergency involving a vehicle V, such as when an accident occurs. The center server 100 stores the transferred vehicle data in a vehicle data DB (database) and analyzes the data to grasp the situation when an accident occurs, for example.

[0016] However, in the data transfer system 1' according to the comparative example using existing technology, as shown in Fig. 1, there is a risk that the transfer may fail due to, for example, poor radio wave reception, insufficient power in the battery 11, or insufficient memory space in the in-vehicle device 10 (not shown). As a result, the center server 100 is unable to acquire vehicle data and is unable to grasp the situation of the vehicle V in an emergency.

[0017] Therefore, in the data transfer method according to the embodiment, various states of the vehicle V in an emergency are acquired, and the transfer process of the vehicle data is controlled based on the various acquired states.

[0018] Specifically, as shown in Fig. 2, in the data transfer method according to the embodiment, the in-vehicle device 10 acquires various states of the vehicle V in an emergency such as when an accident occurs (step S1). Here, as shown in Fig. 3, the various states are, for example, radio wave states around the vehicle V. Also, the various states are, for example, battery states indicating the remaining amount of power. Also, the various states are, for example, memory states indicating the free space status of the memory area of the in-vehicle device 10.

[0019] As shown in Fig. 2, in the data transfer method according to the embodiment, the in-vehicle device 10 controls the transfer process of the vehicle data based on the various states shown in Fig. 3. For example, the in-vehicle device 10 controls the transfer process of the vehicle data based on the radio wave state and the battery state (step S2).

[0020] As an example of control in such a case, if the radio wave condition is good and the battery condition is good (i.e., sufficient power), the in-vehicle device 10 sets the battery 11 to maximum output and performs data transfer with the center server 100 as the transfer destination. On the other hand, if the battery condition is good but the radio wave condition is poor, the in-vehicle device 10 sets the battery 11 to maximum output and performs data transfer with the storage unit 14, which is the internal storage of the in-vehicle device 10, as the transfer destination.

[0021] Furthermore, for example, the in-vehicle device 10 controls the compression process in the transfer process of vehicle data based on the radio wave condition and memory condition.

[0022] As an example of control in such a case, if the radio wave condition and memory condition are good (i.e., there is sufficient free memory space), the in-vehicle device 10 sets the battery 11 to maximum output, compresses the vehicle data, and then transfers the data to the center server 100. On the other hand, if the radio wave condition is good but the memory condition is poor (i.e., it is not possible to secure memory space), the in-vehicle device 10 sets the battery 11 to maximum output, transfers the vehicle data to the center server 100, but does not compress the vehicle data.

[0023] As described above, in the data transfer method according to the embodiment, the in-vehicle device 10 performs control to increase the success rate of data transfer to the center server 100 or internal storage as much as possible while securing at least the vehicle data according to various states of the vehicle V in an emergency. Details of the control of the transfer process according to the combination of various states of the vehicle V will be described later with reference to FIG. 6.

[0024] As described above, in the data transfer method according to the embodiment, various states of the vehicle V in an emergency are acquired, and the transfer process of vehicle data is controlled based on the various acquired states.

[0025] Therefore, according to the data transfer method of the embodiment, it is possible to transfer as much vehicle data as possible in an emergency. Below, a more specific description will be given of an example configuration of a data transfer system 1 to which the data transfer method of the embodiment is applied.

[0026] 4 is a diagram showing an example of the configuration of a data transfer system 1 according to an embodiment. As shown in FIG. 4, the data transfer system 1 includes one or more in-vehicle devices 10 and a center server 100.

[0027] As shown in FIG. 4, the in-vehicle device 10 and the center server 100 are connected to each other by a network N such as the Internet or a mobile phone network, and are configured to be able to transmit and receive data to and from each other via the network N.

[0028] The in-vehicle device 10 is a computer of any kind mounted on the vehicle V, and is realized as, for example, an ECU (Electronic Control Unit) or a drive recorder.

[0029] The center server 100 is realized, for example, as a cloud server, and is a computer that collects vehicle data from each vehicle V via the network N, stores it in a vehicle data DB, and analyzes the stored vehicle data to grasp the situation of the vehicle V in an emergency.

[0030] Next, Fig. 5 is a block diagram showing an example of the configuration of the in-vehicle device 10 according to the embodiment. Note that Fig. 5 shows only components necessary for explaining the features of the embodiment, and omits descriptions of general components.

[0031] In other words, the components shown in Figure 5 are conceptual functional components and do not necessarily have to be physically configured as shown. For example, the specific form of distribution and integration of each block is not limited to that shown, and all or part of them can be functionally or physically distributed and integrated in any unit depending on various loads, usage conditions, etc.

[0032] In addition, in the description using FIG. 5, the description of components that have already been described may be simplified or omitted.

[0033] As shown in FIG. 5, the in-vehicle device 10 according to the embodiment includes a battery 11, an internal communication unit 12, an external communication unit 13, a storage unit 14, and a control unit 15.

[0034] The battery 11 is an auxiliary power source mounted inside the in-vehicle device 10. The internal communication unit 12 is realized by, for example, a network interface card (NIC). The internal communication unit 12 is connected to various devices 2 mounted on the vehicle V via an in-vehicle network such as a controller area network (CAN).

[0035] The various devices 2 are a group of devices that are mounted on the vehicle V and output various vehicle data to the in-vehicle device 10. The various devices 2 include, for example, an antenna, a camera, a GPS (Global Positioning System) sensor, an acceleration sensor, a radar, and the like.

[0036] The antenna detects the radio wave conditions around the vehicle V. The camera is, for example, a drive recorder or a camera mounted in various locations on the vehicle V, and captures images of a predetermined shooting area inside and outside the vehicle V. The GPS sensor detects location information including latitude and longitude. The acceleration sensor detects the speed and acceleration of the vehicle V. The radar detects objects and the like around the vehicle V. Note that these are merely examples of the devices included in the various devices 2.

[0037] The external communication unit 13 is realized by, for example, an NIC, similar to the internal communication unit 12. The external communication unit 13 is wirelessly connected to the center server 100 via, for example, a network N, and transmits and receives various information to and from the center server 100.

[0038] Furthermore, the external communication unit 13 is connected to an external device by short-range wireless communication via Bluetooth (registered trademark) or the like, or by wired or direct connection via USB (Universal Serial Bus) or the like. The external device is a device that can extract the recorded data 14b stored in the storage unit 14, which is an internal storage described later, and is, for example, a terminal device such as a smartphone, a PC (Personal Computer), or a dedicated maintenance device.

[0039] The storage unit 14 is an internal storage of the in-vehicle device 10, and is realized by, for example, a semiconductor memory element such as a random access memory (RAM) or a flash memory, or a storage device such as a hard disk or an optical disk, or an auxiliary storage device such as an SSD (Solid State Drive). In the example of Fig. 5, the storage unit 14 has a compressed work area 14a and recorded data 14b.

[0040] The compression work area 14a is a work area used when compressing the vehicle data. The recorded data area 14b records the vehicle data when the vehicle data is transferred to the internal storage.

[0041] The control unit 15 is a controller, and is realized, for example, by a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) executing various programs (not shown) stored in the storage unit 14 using RAM as a work area. The control unit 15 can also be realized, for example, by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0042] The control unit 15 has a detection unit 15a, an acquisition unit 15b, a judgment unit 15c, a transfer control unit 15d, a battery control unit 15e, a memory control unit 15f, and a compression processing unit 15g, and realizes or executes the functions and actions of information processing described below.

[0043] The detection unit 15a detects the occurrence of an emergency event, for example, the occurrence of an accident, based on various vehicle data output by the various devices 2. Note that the emergency event is not limited to an accident, but may also be, for example, a failure of the various devices 2 that impairs the running of the vehicle V or the safety of the occupants. The detection unit 15a also notifies the acquisition unit 15b that an emergency event has occurred.

[0044] When the detection unit 15a detects the occurrence of an emergency event, the acquisition unit 15b acquires various states of the vehicle V in the emergency from the various devices 2, the battery 11, and the memory unit 14. For example, the acquisition unit 15b acquires the radio wave state from the various devices 2. Also, for example, the acquisition unit 15b acquires the battery state from the battery 11. Also, for example, the acquisition unit 15b acquires the memory state from the memory unit 14. Also, the acquisition unit 15b notifies the determination unit 15c of the various acquired states.

[0045] The determination unit 15c determines the radio wave state, memory state, and memory state acquired by the acquisition unit 15b. Based on the determined various states, the determination unit 15c causes the transfer control unit 15d to control the transfer process of the vehicle data.

[0046] The transfer control unit 15d causes the battery control unit 15e to control the battery 11 in accordance with the various states determined by the determination unit 15c. Similarly, the transfer control unit 15d causes the memory control unit 15f to control the storage unit 14 in accordance with the various states determined. Similarly, the transfer control unit 15d causes the compression processing unit 15g to perform compression processing of the vehicle data in accordance with the various states determined.

[0047] The battery control unit 15e controls the battery 11 in accordance with instructions from the transfer control unit 15d. The memory control unit 15f controls the storage unit 14 in accordance with instructions from the transfer control unit 15d.

[0048] The compression processing unit 15g performs a compression process on the vehicle data using the compression work area 14a in response to an instruction from the transfer control unit 15d. Also, the compression processing unit 15g transfers the vehicle data to the center server 100 via the external communication unit 13 in response to an instruction from the transfer control unit 15d. Alternatively, the compression processing unit 15g transfers the vehicle data to the storage unit 14 in response to an instruction from the transfer control unit 15d, and causes the vehicle data to be recorded as record data 14b.

[0049] Next, specific control contents of the vehicle data transfer process based on various states of the vehicle V will be described with reference to Fig. 6. Fig. 6 is an explanatory diagram of the control contents of the vehicle data transfer process.

[0050] First, a case where the radio wave condition is good will be described. As shown in Fig. 6, when the radio wave condition is good, it is assumed that the battery condition is also good. In this case, the transfer control unit 15d sets the transfer destination to the center server 100 regardless of the memory condition. The transfer control unit 15d also controls the battery control unit 15e to set the battery 11 to maximum output.

[0051] If the memory condition is good, the transfer control unit 15d causes the memory control unit 15f to normally reserve the compression work area 14a, causes the compression processing unit 15g to perform compression processing, and then causes the vehicle data to be transferred to the center server 100.

[0052] In addition, if there is little free memory, the transfer control unit 15d forcibly causes the memory control unit 15f to reserve the compression work area 14a, causes the compression processing unit 15g to perform compression processing, and then causes the vehicle data to be transferred to the center server 100.

[0053] Also, if the memory condition is poor, the transfer control unit 15d does not cause the memory control unit 15f to reserve the compression work area 14a, and does not cause the compression processing unit 15g to perform compression processing, and instead causes the uncompressed vehicle data to be transferred to the center server 100.

[0054] Next, it is assumed that the radio wave condition is good but the battery condition is bad (i.e., power is insufficient). In this case, if the memory condition is good, the transfer control unit 15d causes the battery control unit 15e to secure power from the battery 11 by, for example, stopping other functions, and causes the determination unit 15c to determine the power after the security.

[0055] If there is enough power for both compression and transmission, the transfer control unit 15d causes the memory control unit 15f to normally reserve the compression work area 14a, causes the compression processing unit 15g to perform compression processing, and then transfers the vehicle data to the center server 100.

[0056] Furthermore, if there is enough power for transmission only, the transfer control unit 15d does not cause the memory control unit 15f to reserve the compression work area 14a, and does not cause the compression processing unit 15g to perform compression processing, but instead causes the uncompressed vehicle data to be transferred to the center server 100.

[0057] Furthermore, if neither compression nor transmission is possible, the transfer control unit 15d does not cause the memory control unit 15f to reserve the compression work area 14a, and does not cause the compression processing unit 15g to perform compression processing, but instead causes the uncompressed vehicle data to be transferred to the internal storage.

[0058] In addition, when the radio wave condition is good but the battery condition is bad and there is little free memory, the transfer control unit 15d causes the battery control unit 15e to secure power for the battery 11 by, for example, stopping other functions, and causes the determination unit 15c to determine the power after it has been secured.

[0059] If there is enough power to perform both compression and transmission, the transfer control unit 15d forces the memory control unit 15f to reserve the compression work area 14a, and causes the compression processing unit 15g to perform compression processing before transferring the vehicle data to the center server 100.

[0060] Furthermore, if there is enough power for transmission only, the transfer control unit 15d does not cause the memory control unit 15f to reserve the compression work area 14a, and does not cause the compression processing unit 15g to perform compression processing, but instead causes the uncompressed vehicle data to be transferred to the center server 100.

[0061] Furthermore, if neither compression nor transmission is possible, the transfer control unit 15d does not cause the memory control unit 15f to reserve the compression work area 14a, and does not cause the compression processing unit 15g to perform compression processing, but instead causes the uncompressed vehicle data to be transferred to the internal storage.

[0062] In addition, when the radio wave condition is good but the battery condition is bad, and the memory condition is bad, the transfer control unit 15d causes the battery control unit 15e to secure the power of the battery 11 by, for example, stopping other functions.

[0063] Then, the transfer control unit 15d causes the memory control unit 15f to reserve the compression work area 14a and causes the compression processing unit 15g to transfer the uncompressed vehicle data to the center server 100 without performing the compression process.

[0064] When the battery condition is poor, the transfer control unit 15d uses as much power available for transmission as possible from the power secured by the battery control unit 15e to transfer the vehicle data to the center server 100. At this time, if all the vehicle data cannot be transferred to the center server 100, the transfer control unit 15d can transfer the remaining vehicle data to the internal storage.

[0065] Next, a case where the radio wave condition is poor will be described. As shown in Fig. 6, when the radio wave condition is poor, the transfer control unit 15d sets the internal storage as the transfer destination regardless of the battery state and memory state.

[0066] When the radio wave condition is poor but the battery condition is good, the transfer control unit 15d causes the battery control unit 15e to set the battery 11 to the maximum output, regardless of the memory condition.

[0067] If the memory condition is good, the transfer control unit 15d causes the memory control unit 15f to normally secure the compression work area 14a, causes the compression processing unit 15g to perform compression processing, and then causes the vehicle data to be transferred to the internal storage.

[0068] Furthermore, if there is little free memory, the transfer control unit 15d makes the memory control unit 15f forcibly secure the compression work area 14a, and makes the compression processing unit 15g perform compression processing before transferring the vehicle data to the internal storage.

[0069] Also, if the memory condition is poor, the transfer control unit 15d does not cause the memory control unit 15f to reserve the compression work area 14a, and does not cause the compression processing unit 15g to perform compression processing, and instead causes the uncompressed vehicle data to be transferred to the internal storage.

[0070] Furthermore, when the radio wave condition is poor and the battery condition is poor, regardless of the memory condition, the transfer control unit 15d causes the battery control unit 15e to secure the power of the battery 11 by, for example, stopping other functions.

[0071] Then, the transfer control unit 15d does not cause the memory control unit 15f to reserve the compression work area 14a, and does not cause the compression processing unit 15g to perform the compression process, and causes the uncompressed vehicle data to be transferred to the internal storage.

[0072] This means that when the radio wave conditions are poor, vehicle data can be stored in internal storage without being transferred to the center server 100, and the vehicle data can be obtained by transferring it to the center server 100 or by extracting it using an external device after the radio wave conditions are improved.

[0073] In Figure 6, radio wave status, battery status, and memory status are given as examples of various states, and the control content for each combination of these is shown, but control may also be performed taking into account various other conditions such as the available space in the internal storage and the transfer speed to the center server 100.

[0074] Next, a processing procedure executed by the in-vehicle device 10 according to the embodiment will be described with reference to Fig. 7. Fig. 7 is a flowchart showing the processing procedure executed by the in-vehicle device 10 according to the embodiment.

[0075] 7, the detection unit 15a detects whether or not an emergency such as an accident has occurred (step S101). If no emergency has occurred (step S101, No), step S101 is repeated.

[0076] If an accident has occurred (Yes at step S101), the acquisition unit 15b acquires various states of the vehicle V (step S102).

[0077] Then, the transfer control unit 15d controls the transfer process of the vehicle data based on various conditions (step S103), and the process ends.

[0078] As described above, the in-vehicle device 10 according to the embodiment includes the acquisition unit 15b and the transfer control unit 15d. The acquisition unit 15b acquires various vehicle conditions in an emergency. The transfer control unit 15d controls the compression process in the transfer process of vehicle data based on the radio wave conditions and memory conditions around the vehicle V included in the various conditions acquired by the acquisition unit 15b.

[0079] Therefore, the in-vehicle device 10 according to the embodiment can transfer as much vehicle data as possible in an emergency.

[0080] In addition, when the radio wave conditions are good but the memory condition indicates that there is little free space, the transfer control unit 15d forcibly secures the compression work area 14a (corresponding to an example of a ``work area for compression processing''), performs compression processing using the compression work area 14a, and then transfers the vehicle data to the center server 100.

[0081] Therefore, according to the in-vehicle device 10 according to the embodiment, when the radio wave condition is good and at least compression processing is possible, the compression processing is performed, thereby making it possible to reduce communication costs.

[0082] Furthermore, when the radio wave condition is good but the memory condition is poor, the transfer control unit 15d transfers the vehicle data to the center server 100 without performing compression processing.

[0083] Therefore, according to the in-vehicle device 10 of the embodiment, when the radio wave conditions are good but compression processing is difficult, the vehicle data can be transferred without performing compression processing, thereby prioritizing at least securing the vehicle data in the center server 100.

[0084] In addition, when the radio wave condition is poor and the memory condition indicates that there is little free space, the transfer control unit 15d forcibly secures the compressed work area 14a, performs compression processing using the compressed work area 14a, and then transfers the vehicle data to the internal storage.

[0085] Therefore, according to the in-vehicle device 10 of the embodiment, when the radio wave condition is poor but at least compression processing is possible, the compression processing can be performed to reduce the amount of space used in the internal storage to which the data is transferred.

[0086] Furthermore, when both the radio wave condition and the memory condition are poor, the transfer control unit 15d transfers the vehicle data to the internal storage without performing compression processing.

[0087] Therefore, according to the in-vehicle device 10 according to the embodiment, even if both the radio wave condition and the memory condition are poor, it is possible to give priority to at least securing vehicle data in the internal storage.

[0088] In the above-described embodiment, the power is mainly from the battery 11 provided in the in-vehicle device 10, but the configuration may also be such that power can be supplied from another power source provided in the vehicle V and used.

[0089] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0090] 1. Data Transfer System 2 Various equipment 10 Onboard equipment 11 Battery 12 Internal Communications Department 13 External Communications Department 14 Storage section 14a Compression Work Area 14b Recorded Data 15 Control Unit 15a Detector 15b Acquisition part 15c Judgment section 15d Transfer control section 15e Battery control unit 15f Memory control unit 15g Compression processing unit 100 Center Server V vehicle

Claims

1. An in-vehicle device comprising a working memory area that can be used to compress vehicle data, and a transfer control unit that transfers acquired vehicle data to an external device in an emergency, The transfer control unit If the radio wave condition for communication with the external device is good and there is free space for compression in the work memory area, the acquired vehicle data is compressed and transferred to the external device. Even if the communication radio wave condition is good, if the free space for the compression is insufficient in the memory area for the work, the acquired vehicle data is transferred to the external device as is. In-vehicle device.

2. An in-vehicle device comprising a working memory area that can be used to compress vehicle data, and a transfer control unit that transfers the acquired vehicle data to an external device in an emergency, The transfer control unit If the radio wave condition for communication with the external device is good but the free space for the compression in the memory area for the work is insufficient, the memory area for the work is secured in the internal storage, the compression process is performed, and the acquired vehicle data is then transferred to the external device. In-vehicle device.

3. The transfer control unit When the communication radio wave condition is poor, the acquired vehicle data is transferred to an internal storage instead of being transferred to the external device. The in-vehicle device according to claim 1 or 2.

4. A transfer control method for compressing vehicle data using a work memory area and transferring the acquired vehicle data to an external device in an emergency, comprising: an acquisition step of acquiring various states of the vehicle; If the radio wave condition for communication with the external device is good and there is free space for the compression in the work memory area, the compressed vehicle data obtained by compressing the acquired vehicle data is transferred to the external device; a transfer control step of transferring the acquired vehicle data to the external device as is when the communication radio wave condition is good but the free space for the compression is insufficient in the work memory area; A transfer control method including:

5. An in-vehicle device comprising a working memory area that can be used to compress vehicle data, and a transfer control unit that transfers acquired vehicle data to internal storage in an emergency, The transfer control unit If there is free space for the compression in the working memory area and if the compression is possible using the power of a battery of the in-vehicle device, compress the acquired vehicle data and transfer the compressed vehicle data to the internal storage; If the battery power of the in-vehicle device is not sufficient for compression, the acquired vehicle data is transferred to the internal storage as is. In-vehicle device.

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