JP2012226701A - On-vehicle information system and control method thereof - Google Patents

Abstract

To provide an in-vehicle information system capable of duplicating recorded information of an abnormal situation when an abnormal situation occurs and easily taking the duplicated recorded information out of the vehicle.
An in-vehicle information system 1F00 according to the present invention includes a system control unit 1000, a data buffer unit 1200, at least one of vehicle operation information, a vehicle motion state, and vehicle position information, Driving information including video information including video information including at least one of the rear images, a driving information acquisition unit 1350 that records the video information in the data buffer unit 1200, a video encoding unit 1300 that encodes video information at a predetermined bit rate, and video And an AV processing unit 1100 that reproduces AV information including at least one of audio and audio, and the system control unit encodes at least a part of the operation information encoded by the video encoding unit and recorded in the data buffer unit. To the media.
[Selection] Figure 1

Description

  The present invention relates to an in-vehicle information system including an in-vehicle AV playback system mounted on an automobile and a drive record system for recording driving information.

  In recent years, navigation devices, AV playback devices that play back video and audio in a vehicle, drive recorder devices, and the like are used as in-vehicle electronic devices mounted on automobiles.

  The in-vehicle AV playback device supports various media playback functions such as TV digital broadcast reception, optical disc media, USB devices, and SD cards.

  A drive recorder is an in-vehicle device intended to leave objective evidence of an accident when an abnormal situation such as a traffic accident occurs. Therefore, it is important to record the driving information and surrounding video information of the vehicle before and after the accident and to increase the possibility of the recorded data remaining. For that purpose, (1) a function of duplicating information and (2) improvement of portability that can be easily taken out from an accident vehicle are necessary.

  In Patent Document 1, in a drive recorder system, in addition to a ring buffer for mainly recording operation information, information is saved in a separate storage memory, or an information system using a network causes an accident consisting of a plurality of sources. A method for replicating and collecting time information on a server has been proposed.

International Publication No. 2007/080921

  However, when the conventional drive recorder is configured as a system for replicating information via a network, the information replicating means does not function at a location where the network infrastructure is not fully maintained. In addition, when a storage memory is provided for saving data in the event of an accident, handling of the storage memory is not an everyday operation for the user, but is an operation specific to an accident. It is difficult to take action to take out.

  Accordingly, an object of the present invention is to provide an in-vehicle information system that can duplicate recorded information of an abnormal situation and easily take the duplicated recorded information out of the vehicle when an abnormal situation occurs.

  An in-vehicle information system according to an aspect of the present invention is an in-vehicle information system mounted on a vehicle, and includes a system control unit, a data buffer unit, operation information of the vehicle, a motion state of the vehicle, and a position of the vehicle Driving information including at least one piece of information and video information including at least one video of the front and rear of the vehicle is acquired and recorded in the data buffer unit; and the video information is determined in advance. A video encoding unit for encoding at a specified bit rate, and an AV processing unit for reproducing AV information including at least one of video and audio, wherein the AV processing unit includes at least one for recording the AV information. A media interface unit that connects the removable media and the AV processing unit, and a small amount of video and audio included in the AV information. An AV playback unit that plays back at least one, and the system control unit encodes at least a part of the operation information encoded by the video encoding unit and recorded in the data buffer unit to the AV processing unit. Recording is performed on the medium via the media interface unit.

  According to this configuration, in addition to the data buffer unit included in the in-vehicle information system, the driving information is recorded on an external recording medium of the in-vehicle information system and removable media. In addition, since the insertion / extraction operation of media used for reproducing AV information is a daily operation for a user, for example, an on-vehicle music player or the like, it is necessary to take out media on which driving information is recorded when an abnormal situation occurs. , Does not request an operation unfamiliar to the user. Therefore, when an abnormal situation occurs, the user can easily take out the recorded information in which the recorded information of the abnormal situation is copied out of the vehicle by removing the media used for reproducing the AV information from the in-vehicle information system. it can.

  Further, the system control unit further includes an abnormality detection unit that detects an abnormality of the motion state of the vehicle or an abnormal situation that is an abnormality of a driving operation by a driver of the vehicle based on the driving information, When the abnormality detection unit detects the occurrence of the abnormal situation, at least a part of the operation information recorded in the data buffer unit may be recorded on the medium by the AV processing unit.

  According to this configuration, after the abnormality detection unit detects an abnormal situation, at least a part of the operation information recorded in the data buffer unit is recorded on the medium, so that the data transfer speed of the medium is AV information. Even if the medium is insufficient for both the reproduction of the information and the recording of the driving information, the reproduction of the medium can be stopped when the abnormal situation occurs, and the control that gives priority to the recording of the driving information can be performed. As a result, it is possible to preferentially hold the driving information when an abnormal situation occurs. For this reason, it becomes possible to use a cheaper medium.

  More specifically, the abnormality detection unit may detect the occurrence of the abnormal situation when a value indicated by the information included in the driving information is not included in a predetermined normal range. Good.

  The system control unit further includes a write flag holding unit that holds a write flag indicating permission or prohibition of writing of the operation information to the medium, and the system control unit, when the write flag indicates write prohibition, The processing unit may not have the operation information recorded on the medium.

  According to this configuration, it is possible to provide a user with a degree of freedom for specifying a medium to be used for storing driving information.

  The system control unit further includes: an overwrite flag holding unit that holds an overwrite flag indicating permission or prohibition of overwriting of the AV information recorded on the medium; And when the overwriting flag indicates prohibition of overwriting, the AV processing unit records at least a part of the operation information in an empty area of the medium, and (2) the writing flag indicates that writing is permitted. When the overwriting flag indicates permission of overwriting, the AV processing unit may overwrite and record the AV information with at least a part of the operation information.

  According to this configuration, it is possible to construct a system using media including information that the user does not want to be overwritten.

  The system control unit further includes: a free space information register for recording information indicating a free space of the media; (1) when the media interface unit recognizes the presence of the media, the write flag Indicates that writing is permitted and the overwrite flag indicates prohibition of overwriting, the address of the free area of the medium is acquired, the address is recorded in the free area information register, and ( 2) When the abnormality detection unit detects the occurrence of the abnormality, the AV processing unit refers to the free space information register, and at least a part of the operation information recorded in the data buffer unit May be recorded in an empty area of the medium.

  According to this configuration, when duplicating the operation information to the medium when an abnormal situation occurs, the time for acquiring the free space information can be omitted, and the duplication operation can be started earlier.

  The system control unit further includes a free space information register for recording information indicating a free space of the media, and the system control unit recognizes that the write flag is written when the media interface unit recognizes the presence of the media. When permission is indicated and the overwrite flag indicates prohibition of overwriting, free space information indicating the free space of the medium is acquired, and the smaller the free space, the lower the bit rate. As described above, the bit rate of the video encoding unit may be set.

  According to this configuration, it is possible to set an appropriate bit rate giving priority to the recording time according to the free area of the medium.

  The media interface unit connects a plurality of the media and the AV processing unit. The system control unit indicates that the write flag indicates permission for writing and the overwrite flag is overwritten. If the permission is indicated, the bit rate obtained by acquiring the smallest total capacity among the total capacity of each of the plurality of media and dividing the smallest total capacity by a predetermined reserved time The bit rate of the video encoding unit may be set so as to encode in the following.

  According to this configuration, even when a plurality of media are connected, it is possible to record on any media for a length longer than the reserved time desired by the user.

  Specifically, the system control unit may set the reservation time longer as the smallest total capacity increases.

  The media interface unit connects a plurality of the media and the AV processing unit. The system control unit indicates that the write flag indicates permission for writing and the overwrite flag is overwritten. In the case of prohibition, a bit rate obtained by obtaining the smallest available capacity of each of the plurality of media and dividing the smallest available capacity by a predetermined reserved time The bit rate of the video encoding unit may be set so as to encode in the following.

  According to this configuration, it is possible to record the AV information that has already been recorded on any of a plurality of media for a length longer than the reserved time desired by the user.

  Specifically, the system control unit may set the reservation time longer as the smallest available capacity is larger.

  The media interface unit connects a plurality of the media and the AV processing unit, and the system control unit acquires the free capacity of each of the plurality of media and records it on a medium having a larger free capacity. The AV processing unit may record the driving information so that the video information included in the driving information is higher in image quality.

  Further, the AV processing unit acquires a media band acquisition unit that acquires a media band that is a band indicating the data transfer capability of the media, and acquires an AV band that is a band necessary for reading the AV information from the medium. An AV band acquisition unit and a playback stop determination unit, wherein the playback stop determination unit is a case where the abnormality detection unit detects the occurrence of the abnormal situation during playback of the AV information, When the absolute value of the difference between the media band and the AV band is smaller than a predetermined value, the reproduction of the AV information may be stopped.

  According to this configuration, recording can be performed reliably regardless of the transfer capability of the media.

  The AV processing unit may notify the user using at least one of video and audio when the recording of the driving information on the medium is completed.

  According to this configuration, it is possible to easily know an abnormal situation that occurred while the user was away from the vehicle.

  When an abnormal situation occurs, it is possible to provide an in-vehicle information system that can duplicate the recorded information of the abnormal situation and easily take the duplicated recorded information out of the vehicle.

It is a functional block diagram of in-vehicle information system 1F00 concerning Example 1 of the present invention. It is a flowchart which shows the flow of a process of the vehicle-mounted information system 1F00 which concerns on Example 1 of this invention. It is a functional block diagram of in-vehicle information system 2F00 concerning Example 2 of the present invention. It is a flowchart which shows the flow of a process of the vehicle-mounted information system 2F00 which concerns on Example 2 of this invention. It is a functional block diagram of in-vehicle information system 3F00 concerning Example 3 of the present invention. It is a flowchart which shows the flow of a process of the vehicle-mounted information system 3F00 which concerns on Example 3 of this invention. It is a functional block diagram of the vehicle-mounted information system 4F00 which concerns on Example 4 of this invention. It is a flowchart which shows the flow of a process of the vehicle-mounted information system 4F00 which concerns on Example 4 of this invention. It is a functional block diagram of in-vehicle information system 5F00 concerning Example 5 of the present invention. It is a flowchart which shows the flow of a process of the vehicle-mounted information system 5F00 which concerns on Example 5 of this invention. It is a block diagram which shows the hardware constitutions of the computer system which implement | achieves the vehicle information system which concerns on Examples 1-5 of this invention, and its modification.

  Hereinafter, embodiments of an in-vehicle information system according to the present invention will be described in detail with reference to the drawings.

Example 1
An example of the in-vehicle information system 1F00 shown in FIG. 1 will be described as the in-vehicle information system according to the first embodiment of the present invention. The in-vehicle information system 1F00 is an in-vehicle information system mounted on a vehicle.

  As illustrated in FIG. 1, the in-vehicle information system 1F00 includes a system control unit 1000, an AV processing unit 1100, a data buffer unit 1200, a video encoding unit 1300, and an operation information acquisition unit 1350.

  The driving information acquisition unit 1350 acquires driving information including at least one of vehicle operation information, vehicle movement state, and vehicle position information, and video information including at least one image of the front and rear of the vehicle, Records in the data buffer unit 1200.

  Specifically, the driving information acquisition unit 1350 acquires video information input from the camera 1400 installed in the vehicle and encoded by the video encoding unit 1300. Further, the driving information acquisition unit 1350 acquires, from a vehicle ECU (Electronic Control Unit) 1450, steering information indicating the vehicle speed, the steering angle and angular acceleration of the steering, the acceleration of the vehicle, the operation amount of the brake and the accelerator, and the like. Further, the driving information acquisition unit 1350 acquires position information such as the current position and direction of the vehicle from, for example, GPS (Global Positioning System) or wireless LAN (Local Area Network).

  The data buffer unit 1200 is, for example, an HDD (Hard Disk Drive) or an SSD (Solid State Drive). It functions as a so-called ring buffer that records the obtained operation information by FIFO (First In First Out).

  The video encoding unit 1300 encodes video information at a predetermined bit rate. Note that the video encoding unit 1300 may simultaneously perform encoding and decoding processing for converting a moving image format, sampling processing for reducing resolution, and the like in addition to changing the bit rate.

  The AV processing unit 1100 reproduces AV information including at least one of video and audio. That is, the AV processing unit 1100 is, for example, a car navigation system or an in-vehicle music player. The AV information is, for example, audio information encoded in MPEG Audio Layer-3 format or Advanced Audio Coding format, and moving image information encoded in MPEG-2 or MPEG-4 format. . Any other encoding format can be used.

  The AV processing unit 1100 reproduces at least one of video and audio included in the AV information, and a media interface unit 1110 that connects the AV processing unit 1100 with at least one removable medium 1550 for recording AV information. And an AV playback unit 1120.

  The medium 1550 is a highly portable external recording medium such as an SD card 1600 and a USB (Universal Serial Bus) memory 1500, for example. The media interface unit 1110 may connect one external recording medium as the media 1550 to the AV processing unit 1100, or may connect a plurality of external recording media as the media 1550 to the AV processing unit 1100.

  The system control unit 1000 causes the AV processing unit 1100 to record at least a part of the operation information encoded by the video encoding unit 1300 and recorded in the data buffer unit 1200 onto a medium. Here, at least a part of the driving information is video information including, for example, at least one of the front and rear images of the vehicle.

  This will be described in more detail below.

  The system control unit 1000, the AV processing unit 1100, the data buffer unit 1200, and the operation information acquisition unit 1350 are connected by an ATAPI (AT Attachment Packet Interface) bus with the system control unit 1000 as a master.

  The AV processing unit 1100 is connected via a media interface unit 1110 to a USB memory 1500 for recording AV information as user reproduction data and an SD card 1600 for recording AV information.

  The AV processing unit 1100 causes the AV playback unit 1120 to play back AV information acquired from the USB memory 1500, the SD card 1600, and the data buffer unit 1200 via the media interface unit 1110, and outputs the AV information to the speaker 1700 and the monitor 1800. Further, AV information to be reproduced may be copied from the USB memory 1500 and the SD card 1600 to the data buffer unit 1200.

  The video encoding unit 1300 receives input of video information during operation from the camera 1400 and converts it into video information in a compressed moving image format such as MPEG4. The video information is acquired by the driving information acquisition unit 1350 and recorded in the data buffer unit 1200.

  The system control unit 1000 causes the AV processing unit 1100 to read a part of the operation information recorded in the data buffer unit 1200 at regular intervals such as every 30 minutes, and the media 1550 via the media interface unit 1110. To record. In FIG. 1, two media of the USB memory 1500 and the SD card 1600 are connected as the media 1550, but when a plurality of media are connected to the AV processing unit 1100 as the media 1550 in this way. The system control unit 1000 causes the AV processing unit 1100 to write operation information for both media.

  FIG. 2 is a flowchart showing a process flow of the in-vehicle information system 1F00 according to the first embodiment of the present invention.

  The in-vehicle information system 1F00 records at least a part of the driving information recorded in the data buffer unit 1200 at a predetermined timing on the medium 1550 (S150). As the predetermined timing, for example, a predetermined period such as every 30 minutes may be used, or a time when an explicit operation is performed by the user may be used.

  According to the above configuration, the in-vehicle information system 1F00 according to the present embodiment is an external recording medium of the in-vehicle information system 1F00, in addition to the data buffer unit 1200 included in the in-vehicle information system 1F00, and driving information is a removable medium. Is also recorded. In addition, since the insertion / extraction operation of media used for reproducing AV information is a daily operation for a user, for example, an on-vehicle music player or the like, it is necessary to take out media on which driving information is recorded when an abnormal situation occurs. , Does not request an operation unfamiliar to the user. Accordingly, when an abnormal situation occurs, the user extracts the medium used for reproducing the AV information from the in-vehicle information system 1F00, thereby duplicating the recorded information of the abnormal situation, and easily copying the duplicated recorded information outside the vehicle. Can be taken out.

  Further, since the media that the user has already used for playback of AV information can be used, the user can play back video and audio without incurring the cost of memory for storing driving information. This makes it possible to share the storage memory.

  Further, if an interface for reading / writing operation information from / to an external recording medium is added to the drive record system according to the related art, the manufacturing cost and the like increase. However, in the in-vehicle information system 1F00 according to the present embodiment, the media interface unit 1110 for input / output of AV information, which is an essential component of the AV processing unit 1100, is used for recording driving information, so that the entire system The cost can be reduced.

  Furthermore, in the drive record system according to the related technology, it is necessary to newly add an interface to the drive recorder in order to expand the number of external recording media that are duplication destinations, and the manufacturing cost is also greatly increased. Resulting in. However, in the in-vehicle information system 1F00 according to this embodiment, a plurality of reproduction media such as the USB memory 1500 and the SD card 1600 are connected to the media interface unit 1110 to secure a plurality of duplication destinations of the driving information. Can be selected at the user's will. Therefore, the persistence of data can be improved.

(Example 2)
Next, an example of the in-vehicle information system 2F00 illustrated in FIG. 3 will be described as the in-vehicle information system according to the second embodiment of the present invention.

  As shown in FIG. 3, the in-vehicle information system 2F00 includes a system control unit 2000, an AV processing unit 1100, a data buffer unit 1200, a video encoding unit 1300, an operation information acquisition unit 1350, and an abnormality detection unit 2900. The AV processing unit 1100 includes a media interface unit 1110 and an AV playback unit 1120.

  In addition, the same code | symbol is attached | subjected about the same component as the vehicle-mounted information system 1F00, and detailed description is abbreviate | omitted.

  The in-vehicle information system 2F00 further includes an abnormality detection unit 2900 that detects an occurrence of an abnormal situation that is an abnormality in the motion state of the vehicle or an abnormality in a driving operation by the vehicle driver based on the driving information.

  Specifically, the abnormality detection unit 2900 detects the occurrence of an abnormal situation when the value indicated by the information included in the driving information is not included in the predetermined normal range.

  More specifically, for example, when the steering angular velocity of the steering acquired from the ECU 1450 exceeds a predetermined threshold, the abnormality detection unit 2900 may detect a sudden steering operation as an example of a driving operation abnormality. . In addition, when the operation amount of the brake operation acquired from the ECU 1450 exceeds a predetermined threshold, the abnormality detection unit 2900 may detect a sudden brake operation as an example of an abnormality in the driving operation.

  In addition, when the acceleration in the traveling direction or the rotational direction of the vehicle is acquired from the ECU 1450 and the time change of the acceleration exceeds a predetermined threshold, the abnormality detection unit 2900 detects a vehicle collision as an example of an abnormality in the vehicle state. May be detected.

  Furthermore, when the magnitude of blurring of the video is calculated from the video information acquired from the camera 1400 and the magnitude of blurring per unit time exceeds a predetermined threshold value, the abnormality detection unit 2900 A vehicle collision may be detected as an example of a vehicle state abnormality.

  When the abnormality detection unit 2900 detects the occurrence of an abnormal situation, the system control unit 2000 causes the AV processing unit 1100 to record at least a part of the operation information recorded in the data buffer unit 1200 on the medium 1550.

  This will be described in more detail below.

  The system control unit 2000, the AV processing unit 1100, the data buffer unit 1200, and the operation information acquisition unit 1350 are connected by an ATAPI bus having the system control unit 2000 as a master.

  The AV processing unit 1100 is connected via a media interface unit 1110 to a USB memory 1500 for recording AV information as user reproduction data and an SD card 1600 for recording AV information.

  The AV processing unit 1100 causes the AV playback unit 1120 to play back AV information acquired from the USB memory 1500, the SD card 1600, and the data buffer unit 1200 via the media interface unit 1110, and outputs the AV information to the speaker 1700 and the monitor 1800. Further, AV information to be reproduced is copied from the USB memory 1500 and the SD card 1600 to the data buffer unit 1200.

  The video encoding unit 1300 receives input of video information during operation from the camera 1400 and converts it into video information in a compressed moving image format such as MPEG4. The video information is acquired by the driving information acquisition unit 1350 and recorded in the data buffer unit 1200.

  The abnormality detection unit 2900 notifies the system control unit 2000 when, for example, sudden braking in the operation of the brake is detected.

  Upon receiving the notification from the abnormality detection unit 2900, the system control unit 2000 causes the AV processing unit 1100 to read a part of the operation information recorded in the data buffer unit 1200, and the media control unit 1110 receives the media information via the media interface unit 1110. 1550 is written. For example, when two media, a USB memory 1500 and an SD card 1600, are connected as media 1550, data is written to both of them.

  When the abnormality detection unit 2900 detects an abnormal situation, the system control unit 2000 causes the AV reproduction unit 1120 to reproduce the AV information before causing the AV processing unit 1100 to record at least a part of the operation information on the medium 1550. It may be stopped. According to this, writing of driving information to the medium 1550 can be completed at a higher speed than writing driving information while reading AV information from the medium 1550. This is particularly effective when the data transfer capability of the medium 1550 is small.

  FIG. 4 is a flowchart showing the flow of processing of the in-vehicle information system 2F00 according to the present embodiment.

  First, when the abnormality detection unit 2900 detects an abnormal situation (S148), the system control unit 2000 causes the AV playback unit 1120 to record at least a part of the operation information on the medium 1550 (S150).

  Advantages of the above-described in-vehicle information system according to the first and second embodiments over the drive recorder system according to the related technology are as follows.

  For example, after an accident occurs, if the user carries either the USB memory 1500 or the SD card 1600 and leaves the vehicle, the user can drive even if the data buffer unit 1200 in the vehicle is damaged due to heat or the like. Data of operation information recorded when an abnormality occurs can be secured. The USB memory 1500 and the SD card 1600 are media that hold audio and video data for reproduction possessed by the user, and it can be expected that these insertion / extraction operations are everyday familiar works for the user.

  On the other hand, a method of mounting a dedicated memory for saving operation information when an operation abnormality is detected cannot be used effectively except when an abnormal situation occurs. In addition, since the operation of the memory does not occur on a daily basis, in an emergency situation when an abnormal situation occurs, the user is unfamiliar with the removal and has to give up taking it out or not notice it. The possibility increases. Further, since the save destination is limited to the memory, in order to copy more, it is necessary to have a configuration having a plurality of storage memories similar to the memory.

  Further, as in the in-vehicle information system 2F00, after the abnormality detection unit 2900 detects an abnormal situation, at least a part of the driving information recorded in the data buffer unit 1200 is recorded in the medium 1550, so that the medium Even if the data transfer speed of 1550 is insufficient for both AV information playback and driving information recording, media playback is stopped when an abnormal situation occurs, and driving information recording has priority. Can be controlled. As a result, it is possible to preferentially hold the driving information when an abnormal situation occurs. For this reason, it becomes possible to use a cheaper medium.

(Example 3)
Next, an example of the in-vehicle information system 3F00 shown in FIG. 5 will be described as a third embodiment of the present invention. The in-vehicle information system 3F00 has a configuration in which the system control unit 2000 in the in-vehicle information system 2F00 in FIG. 3 is replaced with a system control unit 3000 different from the system control unit 2000. In addition, the same code | symbol is attached | subjected about the component same as the vehicle-mounted information system 2F00, and detailed description is abbreviate | omitted.

  The in-vehicle information system 3F00 further includes a write flag holding unit 3010 that holds a write flag indicating permission or prohibition of writing the operation information transferred to the data buffer unit 1200 to the medium 1550. The write flag holding unit 3010 is implemented by, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), an SRAM (Static Random Access Memory), or the like.

  When the write flag indicates prohibition of writing, the system control unit 3000 according to the present embodiment does not cause the AV processing unit 1100 to record operation information on the medium 1550.

  This will be described in more detail below.

  For example, at the time of initial setting of the in-vehicle information system 3F00, the system control unit 3000 displays a GUI (Graphical User Interface) or the like on the monitor 1800, and instructs whether to permit writing of driving information on the medium 1550. Get from user. Further, the write flag holding unit 3010 holds the write flag indicating the acquired result.

  When the system control unit 3000 receives a notification from the abnormality detection unit 2900 that notifies that an abnormal situation has occurred, the system control unit 3000 checks the write flag held in the write flag holding unit 3010. When the write flag indicates permission of writing, the AV processing unit 1100 reads a part of the operation information on the data buffer unit 1200 recorded by the video encoding unit 1300, and via the media interface unit 1110. Data is written in both the USB memory 1500 and the SD card 1600. On the other hand, when the write flag indicates that writing is not permitted, the system control unit 3000 does not write operation information.

  FIG. 6 is a flowchart showing the flow of processing of the in-vehicle information system 3F00 according to the third embodiment of the present invention.

  First, triggered by the detection of an abnormal situation by the abnormality detection unit 2900 (Yes in S148), the system control unit 3000 refers to the write flag holding unit 3010 and writes a flag corresponding to the medium 1550 to record operation information. The setting is confirmed (S146). If the write flag indicates write permission (Yes in S146), the system control unit 3000 causes the AV processing unit 1100 to record at least part of the operation information on the medium 1550 (S150).

  On the other hand, when the writing flag indicates prohibition of writing (No in S146), the system control unit 3000 does not record the operation information on the corresponding medium 1550.

  Note that the system control unit 3000 may inquire the user about the setting of the write flag every time the medium 1550 such as the USB memory 1500 and the SD card 1600 is recognized by the media interface unit 1110.

  Further, the write flag holding unit 3010 may be configured to individually record the write flag for each of the USB memory 1500 and the SD card 1600. In this case, when an abnormality occurs, the system control unit 3000 causes the operation information to be written only to a medium whose write permission is indicated in the write flag.

  The in-vehicle information system 3F00 according to the present embodiment further protects the memory that the user does not allow data writing in addition to the superiority of the related technology that the in-vehicle information system 2F00 according to the second embodiment has. The convenience provided to the user is improved.

Example 4
Next, an example of the in-vehicle information system 4F00 illustrated in FIG. 7 will be described as the in-vehicle information system according to the fourth embodiment of the present invention.

  The in-vehicle information system 4F00 has a configuration in which the system control unit 3000 in the in-vehicle information system 3F00 illustrated in FIG. 5 is replaced with a system control unit 4000 different from the system control unit 3000. In addition, the same code | symbol is attached | subjected about the component same as the vehicle-mounted information system 3F00, and detailed description is abbreviate | omitted.

  In addition to the write flag holding unit 3010, the system control unit 4000 further includes an overwrite flag holding unit 4020 that holds an overwrite flag indicating permission or prohibition of overwriting of AV information recorded on the medium 1550.

  For example, the system control unit (1) when the write flag indicates permission of writing and the overwrite permission setting flag indicates prohibition of overwriting, the AV processing unit 1100 causes the AV processing unit 1100 to transfer at least part of the operation information to the free space of the medium. (2) When the writing flag indicates permission of writing and the overwrite flag indicates permission of overwriting, the AV processing unit 1100 causes the AV information to be overwritten and recorded with at least a part of the operation information. .

  This will be described in more detail below.

  For example, as described above, the system control unit 4000 according to the present embodiment acquires the setting of the write flag from the user and holds the write flag holding unit 3010 in the initial setting operation. Furthermore, when the write flag is set to permit, the system control unit 4000 sets an overwrite flag indicating whether or not to allow the operation information to be overwritten on the AV information already recorded on the medium 1550. Is acquired from the user and held in the overwrite flag holding unit 4020.

  When notified by the abnormality detection unit 2900 that an abnormal situation has occurred, the system control unit 4000 checks the write flag. When the setting of the write flag indicates permission to write to the medium 1550, the system control unit 4000 confirms the setting of the overwrite flag. When the overwriting flag indicates that overwriting is permitted, the system control unit 4000 causes the AV processing unit 1100 to read a part of the operation information recorded in the data buffer unit 1200 and causes the media interface unit 1110 to operate. Via the USB memory 1500 and the SD card 1600 through an arbitrary area including an area where AV information is recorded.

  When the overwrite flag indicates that overwriting is not permitted, the system control unit 4000 acquires the free area addresses of the USB memory 1500 and the SD card 1600, respectively. Further, the system control unit 4000 causes the AV processing unit 1100 to read a part of the operation information recorded in the data buffer unit 1200, and both the USB memory 1500 and the SD card 1600 via the media interface unit 1110. , Write to free space.

  On the other hand, when the setting of the writing flag indicates that writing is not permitted, the system control unit 4000 does not record the operation information on the medium 1550.

  FIG. 8 is a flowchart showing a process flow of the in-vehicle information system 4F00 according to the fourth embodiment of the present invention.

  First, the system control unit 4000 refers to the write flag held in the write flag holding unit 3010 when the occurrence of an abnormal situation is detected by the abnormality detection unit 2900 (Yes in S148) (S146).

  As a result, when the write flag indicates permission to write to the medium 1550 (Yes in S146), the system control unit 4000 next refers to the overwrite flag held in the overwrite flag holding unit 4020. (S242). If the overwrite flag indicates permission of overwriting (Yes in S242), the system control unit 4000 overwrites the AV information even when the AV information is already recorded on the medium 1550. Thus, the driving information is recorded on the medium 1550 (S220).

  On the other hand, when the overwrite flag indicates prohibition of overwriting (No in S242), the system control unit 4000 acquires the free space information of the medium 1550 on which the operation information is recorded (S244). Thereafter, the system control unit 4000 records the operation information in an empty area of the medium 1550 (S250).

  Further, when the write flag indicates that writing is prohibited (No in S146), the system control unit 4000 does not record the operation information on the medium 1550.

  The system control unit 4000 may request the user to set a write flag and an overwrite flag each time the media interface unit 1110 recognizes the media 1550 such as the USB memory 1500 and the SD card 1600.

  The write flag holding unit 3010 and the overwrite flag holding unit 4020 may be configured to hold settings for each medium. For example, the write flag holding unit 3010 may hold the settings for each of the USB memory and the SD card, and the overwrite flag holding unit 4020 may hold the settings for each of the USB memory and the SD card. . In this case, when an abnormality occurs, the system control unit 4000 causes the operation information to be written only to a medium whose write flag setting indicates that writing is permitted.

  In addition, for each medium on which the driving information is written, the driving information is written in an arbitrary area for the medium whose AV flag is permitted to be overwritten in the overwrite flag, and the permission is not permitted. It is also possible to obtain a free area address for the existing media and write operation information in the free area.

  The in-vehicle information system 4F00 according to the present embodiment described above further improves the convenience provided to the user in that the following options are allowed for the user. In other words, a user who wants to copy driving information when an abnormal situation occurs while holding AV information that is playback content in the medium 1550 permits writing of driving information to the medium 1550 and does not allow overwriting. By setting, it is possible to permit the recording of operation information for the space area of the media.

  On the other hand, a user who gives priority to the retention of driving information when an abnormal situation has occurred rather than the retention of playback content makes a setting to permit overwriting of driving information to the media 1550, so A lot of driving information can be duplicated, and the responsiveness until the duplication of driving information can be started can be improved.

(Example 5)
Next, an in-vehicle information system 5F00 shown in FIG. 9 will be described as an in-vehicle information system according to the fifth embodiment of the present invention.

  The in-vehicle information system 5F00 has a configuration in which the system control unit 4000 in the in-vehicle information system 4F00 in FIG. 7 is replaced with a system control unit 5000 having another configuration. In addition, the same code | symbol is attached | subjected about the component same as the vehicle-mounted information system 4F00, and detailed description is abbreviate | omitted.

  The system control unit 5000 includes a write flag holding unit 3010, an overwrite flag holding unit 4020, and a free area information register 5035. Note that the free space information register 5035 may include a plurality of registers corresponding to each of a plurality of media. For example, the free space information register 5035 according to this embodiment includes a USB information register 5030 corresponding to the USB memory 1500 and an SD card information register 5040 corresponding to the SD card 1600.

  When the media interface unit 1110 recognizes the presence of the medium 1550, the system control unit 5000 indicates that the write flag indicates permission of writing and the overwrite flag indicates prohibition of overwriting. Is acquired, and the address is recorded in the free area information register 5035. Thereafter, when the abnormality detection unit 2900 detects the occurrence of an abnormal situation, the system control unit 5000 refers to the free space information register 5035 to acquire the address of the free space of the medium 1550 and sends it to the AV processing unit 1100. Then, at least a part of the operation information recorded in the data buffer unit 1200 is recorded in an empty area of the medium 1550.

  Further, when the media interface unit 1110 recognizes the presence of the media 1550, the system control unit 5000 indicates that the write flag indicates permission of writing and the overwrite flag indicates prohibition of overwriting. The bit rate of the video encoding unit 1300 may be set so that free space information indicating the free space of the media is acquired, and the smaller the acquired free space is, the lower the bit rate is encoded.

  When the media interface unit 1110 connects a plurality of media 1550 to the AV processing unit 1100, the system control unit 5000 indicates that the write flag indicates permission for writing, and the overwrite flag indicates permission for overwriting. Is obtained, the smallest total capacity among the total capacity of each of the plurality of media is obtained, and this smallest total capacity is less than or equal to the bit rate obtained by dividing by a predetermined reserved time. The bit rate of the video encoding unit 1300 may be set so as to encode. For example, when the total capacity of the USB memory 1500 is 128 MB, the total capacity of the SD card 1600 is 256 MB, and the reserved time is predetermined as 60 minutes by the user, the system control unit 5000 performs the video encoding. The bit rate used by the unit 1300 is set to about 568 kbps or less.

  Further, the system control unit 5000 sets the smallest free capacity among the free capacity of each of the plurality of media 1550 when the write flag indicates permission of writing and the overwrite flag indicates prohibition of overwriting. The bit rate of the video encoding unit 1300 may be set so as to be obtained and encoded at a bit rate equal to or less than the bit rate obtained by dividing the smallest free space by a predetermined reserved time.

  FIG. 10 is a flowchart illustrating a process flow of the in-vehicle information system 5F00 according to the present embodiment.

  First, when recognizing the presence of the medium 1550, the system control unit 5000 refers to the write flag corresponding to the recognized medium (S146). Here, when the referred write flag indicates permission of writing (Yes in S146), the system control unit 5000 refers to the overwrite flag corresponding to the recognized medium (S242). If the referenced overwrite flag indicates permission for overwriting (Yes in S242), the system control unit 5000 acquires the total capacity of the medium with the smallest total capacity among the currently recognized media 1550. (S318).

  Next, the system control unit 5000 sets the bit rate of the video encoding unit 1300 so that the operation information for a predetermined secured time is equal to or less than the total capacity acquired in step S318 (S320).

  Thereafter, when the abnormality detection unit 2900 detects an abnormal situation (Yes in S148), the system control unit 5000 causes the AV processing unit 1100 to overwrite the AV information recorded in each medium with the operation information (S220). ).

  On the other hand, when the overwrite flag indicates prohibition of overwriting (No in S242), the system control unit 5000 acquires the free area information of the recognized medium (S244), and this is associated with the corresponding free area information register 5035. (S246).

  Next, the system control unit 5000 acquires the free space of the medium having the smallest free space among the recognized media 1550 (S348).

  Next, the system control unit 5000 sets the bit rate of the video encoding unit 1300 so that the operation information for a predetermined secured time is equal to or less than the free space acquired in step S348 (S350).

  Thereafter, when the abnormality detection unit 2900 detects an abnormal situation (Yes in S148), the system control unit 5000 refers to the free space information register 5035 (S248) and causes the AV processing unit 1100 to operate to free space of each medium. Information is recorded (S250).

  This will be described in more detail below.

  Similar to the system control unit 4000, the system control unit 5000 acquires the setting of the setting of the write flag and the overwrite flag from the user, for example, at the time of initial setting of the in-vehicle information system 5F00, and the write flag holding unit 3010 and the overwrite flag holding unit, respectively. 4020.

  Next, when the system control unit 5000 detects the connection of the USB memory 1500, if the write flag is set to “permitted” and the overwrite flag is set to “not permitted”, the system control unit 5000 has a free space for the medium for which the connection is detected. The information is acquired, and the address and capacity information of the continuous free area having the maximum capacity are acquired as free area information and stored in the USB information register 5030.

  When the system control unit 5000 detects the connection of the SD card 1600, if the write flag is set to permit and the overwrite flag is set to disallow, the system control unit 5000 obtains free space information for the medium from which the connection is detected. And the address and capacity information of the continuous free area having the maximum capacity are stored on the SD card information register 5040.

  When the write flag is set to permit and the overwrite flag is set to permit, the system control unit 5000 compares the total capacity of the USB memory and the total capacity of the SD card, and determines the smaller total capacity value. From this, the video encoding unit 1300 determines the moving image compression bit rate and sets it in the video encoding unit 1300. Specifically, the bit rate is determined as follows. That is, the compression bit rate of the video encoding unit 1300 is set to be lower than the bit rate obtained by dividing the total capacity value on the smaller side by the reserved time given in advance.

  The system control unit 5000 compares the free capacity information of the USB information register 5030 and the SD card information register 5040 when the write flag is set to “permitted” and the overwrite flag is set to “not permitted”. Based on the free capacity value of the video encoding unit 1300, the video encoding unit 1300 determines the bit rate of the moving image compression and sets it in the video encoding unit 1300. The bit rate is determined as follows. That is, the compression bit rate of the video encoding unit 1300 is set so as to be lower than the bit rate obtained by dividing the free space capacity value on the smaller side by the predetermined securing time.

  Upon receiving the notification from the abnormality detection unit 2900, the system control unit 5000 checks the write flag. When the write flag is set to permit, check the overwrite flag setting. If the overwrite flag is set to permit, the AV processing unit 1100 reads out the reserved time of the operation information on the data buffer unit 1200 recorded by the video encoding unit 1300, and the USB memory via the media interface unit 1110. Both the 1500 and the SD card 1600 are written in the leading area. If the overwrite flag is set to not permitted, the USB information register 5030 and the SD card information register 5040 are checked to obtain address and capacity information. In addition, the AV processing unit 1100 reads out the reserved time of the operation information on the data buffer unit 1200 recorded by the video encoding unit 1300, and both the USB memory 1500 and the SD card 1600 via the media interface unit 1110. Are written in the empty area. On the other hand, if the setting of the media write permission flag is not permitted, the system control unit 5000 does not perform the operation information recording process.

  Note that the system control unit 5000 may set the reserved time longer as the smallest total capacity among the plurality of media 1550 increases.

  In addition, the system control unit 5000 may set the reserved time longer as the smallest free space among the plurality of media 1550 is larger.

  In addition, the system control unit acquires the free capacity of each of the plurality of media 1550, and in the AV processing unit, the video information included in the operation information recorded on the medium with the larger free capacity has higher image quality. Driving information may be recorded. For example, video information input from the camera 1400 may be encoded by the video encoding unit 1300 at two bit rates for low image quality and high image quality, and each may be recorded in the data buffer unit 1200. In this case, the system control unit 5000 records the operation information encoded at the bit rate for high image quality on the medium having a large free space, and the operation information encoded at the bit rate for low image quality onto the medium having a small free space. It may be recorded.

  Note that the AV processing unit 1100 includes a media band acquisition unit that acquires a media band that is a band indicating the data transfer capability of the media, and an AV band acquisition that acquires an AV band that is a band necessary for reading AV information from the medium. And a playback stop determination unit, wherein the playback stop determination unit is a case where the abnormality detection unit 2900 detects the occurrence of an abnormal situation during playback of AV information, and the media band and the AV band When the absolute value of the difference is smaller than a predetermined value, the reproduction of AV information may be stopped.

  Note that the AV processing unit 1100 may notify the user using at least one of video and audio when the recording of the driving information on the medium is completed.

  Further, the reserved time in the present embodiment may be given in advance to the system by the designer, or may be set by the user as the initial setting of the in-vehicle information system 5F00.

  The setting of the write flag and the setting of the overwrite flag may be confirmed each time the USB memory 1500 or the SD card 1600 is connected.

  Further, the write flag and the overwrite flag may be configured to hold settings for each of a plurality of media that can be connected to the media 1550, such as a USB memory and an SD card. In that case, the system control unit 5000 causes the operation information to be written only to a medium whose permission is set in the write flag when an abnormality occurs. In addition, for each medium to which driving information is written, the driving information is written in an arbitrary area for media for which overwriting of playback content is permitted in the overwrite flag, and for media that is not permitted. In the USB information register 5030 and the SD card information register 5040, the driving information is written based on the free area information corresponding to the unauthorized medium.

  Compared to the in-vehicle information system 4F00 according to the fourth embodiment, the in-vehicle information system 5F00 according to the present embodiment further provides the following to a user who wants to copy driving information when an abnormal situation occurs while holding the reproduction content in the media. Offering superior convenience. In other words, in the in-vehicle information system 5F00, the copy is made after searching for a free area address when an abnormal situation occurs. However, in this embodiment, the free area information is acquired in advance, so that the replication is immediately ready. Is excellent. Further, in the in-vehicle information system 4F00 according to the fourth embodiment, the free space of the medium restricts the time length of the driving information to be duplicated, whereas the in-vehicle information system 5F00 according to the present embodiment has the free space of the medium. By adjusting the bit rate according to the above, it is always possible to ensure a certain length of time for the operation information to be replicated. As a result, for users who think that retention of driving information in the event of an abnormal situation has priority over retention of playback content, the recording time of the driving information is replicated for a certain length of time as much as possible. The driving information can be copied to the medium 1550 with high quality.

  Note that the in-vehicle information system described as the first to fifth embodiments and the modifications thereof can also be realized by a computer. FIG. 11 is a block diagram illustrating a hardware configuration of a computer system that implements an in-vehicle information system.

  The in-vehicle information system reads a computer 34, a keyboard 36 and a mouse 38 for giving instructions to the computer 34, a display 32 for presenting information such as a calculation result of the computer 34, and a program executed by the computer 34. A CD-ROM (Compact Disc-Read Only Memory) device 40 and a communication modem (not shown).

  A program that is a process performed by the in-vehicle information system is stored in a CD-ROM 42 that is a computer-readable medium, and is read by the CD-ROM device 40. Alternatively, the data is read by the communication modem 52 through a computer network.

  The computer 34 includes a CPU (Central Processing Unit) 44, a ROM (Read Only Memory) 46, a RAM (Random Access Memory) 48, a hard disk 50, a communication modem 52, and a bus 54.

  The CPU 44 executes a program read via the CD-ROM device 40 or the communication modem 52. The ROM 46 stores programs and data necessary for the operation of the computer 34. The RAM 48 stores data such as parameters at the time of program execution. The hard disk 50 stores programs and data. The communication modem 52 communicates with other computers via a computer network. The bus 54 connects the CPU 44, the ROM 46, the RAM 48, the hard disk 50, the communication modem 52, the display 32, the keyboard 36, the mouse 38, and the CD-ROM device 40 to each other.

  Furthermore, some or all of the constituent elements constituting each of the above-described devices may be configured by a single system LSI (Large Scale Integrated Circuit). The system LSI is an ultra-multifunctional LSI manufactured by integrating a plurality of components on a single chip, and specifically, a computer system including a microprocessor, ROM, RAM, and the like. . A computer program is stored in the RAM. The system LSI achieves its functions by the microprocessor operating according to the computer program.

  Furthermore, some or all of the constituent elements constituting each of the above-described devices may be configured from an IC card that can be attached to and detached from each device or a single module. The IC card or module is a computer system that includes a microprocessor, ROM, RAM, and the like. The IC card or the module may include the super multifunctional LSI described above. The IC card or the module achieves its function by the microprocessor operating according to the computer program. This IC card or this module may have tamper resistance.

  Further, the present invention may be the method described above. Further, the present invention may be a computer program that realizes these methods by a computer, or may be a digital signal composed of the computer program.

  Furthermore, the present invention provides a computer-readable recording medium such as a flexible disk, a hard disk, a CD-ROM, an MO, a DVD, a DVD-ROM, a DVD-RAM, a BD (Blu-ray Disc). (Registered trademark)), a memory card such as a USB memory or an SD card, or a semiconductor memory. Further, the digital signal may be recorded on these recording media.

  Further, the present invention may transmit the computer program or the digital signal via an electric communication line, a wireless or wired communication line, a network represented by the Internet, a data broadcast, or the like.

  The present invention may be a computer system including a microprocessor and a memory, wherein the memory stores the computer program, and the microprocessor operates according to the computer program.

  In addition, the program or the digital signal is recorded on the recording medium and transferred, or the program or the digital signal is transferred via the network or the like and executed by another independent computer system. You may do that.

  Furthermore, the above embodiment and its modifications may be combined.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  An in-vehicle information system according to the present invention is an information system that integrates a car navigation system, a drive recorder system, and an in-vehicle AV system. In particular, the in-car information system realizes improvement in portability and survivability of drive recorder information at low cost. Provides a useful configuration above.

32 Display 34 Computer 36 Keyboard 38 Mouse 40 CD-ROM device 42 CD-ROM
44 CPU
46 ROM
48 RAM
50 Hard disk 52 Communication modem 54 Bus 1000, 2000, 3000, 4000, 5000 System control unit 1100 AV processing unit 1110 Media interface unit 1120 AV playback unit 1200 Data buffer unit 1300 Video encoding unit 1350 Operation information acquisition unit 1400 Camera 1450 ECU
1500 USB memory 1550 Media 1600 SD card 1700 Speaker 1800 Monitor 1F00, 2F00, 3F00, 4F00, 5F00 In-vehicle information system 2900 Abnormality detection unit 3010 Write flag holding unit 4020 Overwrite flag holding unit 5030 USB information register 5035 Free space information register 5040 SD card Information register

Claims (15)

An in-vehicle information system mounted on a vehicle,
A system controller;
A data buffer section;
Driving information including at least one of the vehicle operation information, the movement state of the vehicle, and the position information of the vehicle, and video information including at least one image of the front and the rear of the vehicle; An operation information acquisition unit to record in the unit;
A video encoding unit that encodes the video information at a predetermined bit rate;
An AV processing unit that reproduces AV information including at least one of video and audio,
The AV processing unit includes: a media interface unit that connects at least one removable medium for recording the AV information and the AV processing unit;
An AV playback unit that plays back at least one of video and audio included in the AV information,
The system control unit causes the AV processing unit to record at least part of the operation information encoded by the video encoding unit and recorded in the data buffer unit onto the medium via the media interface unit. . Furthermore, an abnormality detection unit that detects the occurrence of an abnormal situation that is an abnormality in the motion state of the vehicle or an abnormality in a driving operation by a driver of the vehicle based on the driving information,
The system control unit causes the AV processing unit to record at least a part of the operation information recorded in the data buffer unit on the medium when the abnormality detection unit detects the occurrence of the abnormal situation. The in-vehicle information system described. The in-vehicle unit according to claim 2, wherein the abnormality detection unit detects the occurrence of the abnormal situation when a value indicated by information included in the driving information is not included in a predetermined normal range. Information system. Furthermore, a write flag holding unit that holds a write flag indicating permission or prohibition of writing the operation information to the medium,
The in-vehicle information system according to any one of claims 1 to 3, wherein the system control unit does not cause the AV processing unit to record the operation information on the medium when the write flag indicates prohibition of writing. And an overwrite flag holding unit for holding an overwrite flag indicating permission or prohibition of overwriting of the AV information recorded on the medium,
The system control unit (1) when the write flag indicates permission of writing and the overwrite flag indicates prohibition of overwriting, the AV processing unit is caused to send at least the operation information to an empty area of the medium. (2) when the write flag indicates permission of writing and the overwrite flag indicates permission of overwriting, the AV processing unit causes the AV information to be included in at least a part of the operation information. The in-vehicle information system according to claim 4, overwriting and recording. Furthermore, a free space information register for recording information indicating the free space of the medium,
(1) When the media interface unit recognizes the presence of the media, the write flag indicates that writing is permitted, and the overwrite flag indicates prohibition of overwriting. Includes acquiring the address of the free area of the medium, recording the address in the free area information register, and (2) if the abnormality detection unit detects the occurrence of the abnormal situation, the free area information The in-vehicle information system according to claim 5, wherein the AV processing unit records at least a part of the operation information recorded in the data buffer unit in an empty area of the medium with reference to a register. Furthermore, a free space information register for recording information indicating the free space of the medium,
When the media interface unit recognizes the presence of the medium, the system control unit indicates that the write flag indicates write permission, and the overwrite flag indicates prohibition of overwriting. The in-vehicle information system according to claim 5, wherein free space information indicating a free space of the medium is acquired, and the bit rate of the video encoding unit is set so that the smaller the free space is, the lower the bit rate is. The media interface unit connects a plurality of the media and the AV processing unit,
When the write flag indicates permission of writing and the overwrite flag indicates permission of overwriting, the system control unit is configured to determine the smallest total capacity among the total capacity of each of the plurality of media. The in-vehicle information according to claim 5, wherein the bit rate of the video encoding unit is set so as to encode at or below the bit rate obtained by dividing the smallest total capacity by a predetermined reserved time. system. The in-vehicle information system according to claim 8, wherein the system control unit sets the reservation time longer as the smallest total capacity is larger. The media interface unit connects a plurality of the media and the AV processing unit,
The system control unit, when the write flag indicates permission to write and the overwrite flag indicates prohibition of overwriting, the smallest free capacity among the free capacity of each of the plurality of media. The in-vehicle information according to claim 5, wherein the bit rate of the video encoding unit is set so as to encode at or below the bit rate obtained by dividing the smallest free space by a predetermined reserved time. system. The in-vehicle information system according to claim 10, wherein the system control unit sets the reservation time longer as the smallest available capacity is larger. The media interface unit connects a plurality of the media and the AV processing unit,
The system control unit acquires the free space of each of the plurality of media, and the AV processing is performed so that the video information included in the operation information recorded on the medium having a larger free space has higher image quality. The in-vehicle information system according to claim 1, wherein the driving information is recorded in a unit. The AV processing unit is a media band acquisition unit that acquires a media band that is a band indicating the data transfer capability of the media;
An AV band acquisition unit for acquiring an AV band which is a band necessary for reading the AV information from the medium;
A playback stop determination unit;
The reproduction stop determination unit is a case where the abnormality detection unit detects the occurrence of the abnormal situation during reproduction of the AV information, and an absolute value of a difference between the media band and the AV band is determined in advance. The in-vehicle information system according to claim 1, wherein reproduction of the AV information is stopped when the value is smaller than the given value. The in-vehicle information system according to claim 1, wherein the AV processing unit notifies the user using at least one of video and audio when the recording of the driving information on the medium is completed. A method for controlling an in-vehicle information system mounted on a vehicle,
Driving information including at least one of the vehicle operation information, the vehicle movement state, and the vehicle position information, and video information including at least one of the front and rear images of the vehicle is acquired, and a data buffer unit An operation information acquisition step to be recorded in
And a recording step of recording at least a part of the driving information recorded in the data buffer section on at least one removable medium for recording at least one of video and audio. .

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