JP4718569B2 - In-vehicle electronic device and moving locus display system - Google Patents

Description

  The present invention relates to an in-vehicle electronic device having a position detection function and a moving locus display system.

  It is convenient if you can record and manage your trajectory and display it on a map. Recently, recording can be easily performed by simply combining an inexpensive portable GPS device and a Web application. That is, the mobile device moves while carrying a GPS device capable of storing the history of the detected position information as log data. The log data stored at the time of movement is stored in the personal computer. This log data is stored in the personal computer in the case of a GPS device having a function of connecting to the personal computer by wire / wireless, when data is transferred using a predetermined communication, and there is no function to connect. Is performed by recording log data on a recording medium such as an SD memory card, mounting the recording medium on a personal computer, and calling the recorded data by the personal computer. By uploading the log data of location information taken in this way to a site that provides web applications such as Motion Based and converting it to a predetermined data format, Google Earth and Google Maps Can be displayed. In addition, application software for converting location information log data into a file for displaying a movement locus in Google Earth or the like, such as a file in KML format, is also freeware. Therefore, if the user obtains the application software in advance, the data can be converted in the personal computer and the movement locus can be displayed on the map information such as Google Earth.

On the other hand, in a target detection device (microwave detector: radar detector) that detects the presence of a vehicle speed measurement device, the position information of the target recorded in advance in the memory is stored, and the installed GPS In some cases, a warning is issued when a certain condition is satisfied, such as being within a predetermined distance compared to the current position information of the vehicle obtained from (Patent Document 1, etc.).
JP 2006-46976 A

  As described above, GPS log data (location information history data) mounted on a target detection apparatus having a GPS reception function is recorded on a recording medium such as an SD memory card, and the recorded log data is recorded in the recorded log data. Based on this, we considered using the system described above to display the vehicle's movement trajectory in map information such as Google Earth. However, when the technical idea is actually embodied in an in-vehicle target detection device, the following various problems occur.

  That is, in the case of a portable GPS device, the GPS device can be carried as it is to the vicinity of a personal computer. However, in an in-vehicle target detection device, a general GPS device is installed at a predetermined position of a vehicle. You ca n’t take it to the PC. Therefore, using a recording medium such as an SD memory card, remove the SD memory card on which log data has been recorded by the target object detection device from the target object detection device, and bring the SD memory card to the location where the personal computer is located. It is necessary to do. Then, there is a high possibility that the information recorded on the SD memory card will be damaged while being brought from the removal to the vicinity of the personal computer. Furthermore, not only does the moving distance simply carry longer, but it is difficult to remove the memory card in the vehicle, and there is a possibility of damage especially when the SD memory card is removed from the target detection device.

  In addition, there is a problem that data is damaged if the power supply is cut off while the position information detected for the SD memory card is written and the data is updated. In particular, in the case of an in-vehicle target detection device, since there are many models that have a function of automatically turning off the power when the vehicle is stopped, there is a possibility that the power supply may be cut off while updating data. High compared to. In addition, in-vehicle electronic devices that are retrofitted after purchasing a vehicle often obtain power from a cigar socket or the like. Such a power source is disconnected by an operation on the vehicle side such as ACCOFF. Therefore, the possibility that the power supply is cut off during the data update is higher than other devices.

  The present invention can securely store and hold history data (log data, logging data) of position information in an in-vehicle electronic device, and can move the stored history data to a personal computer or the like to display a movement locus. An object of the present invention is to provide an electronic device and a movement trajectory display system.

In order to solve the above-described object, an in-vehicle electronic device according to the present invention is (1) an in-vehicle electronic device that can be operated by power supply from a vehicle side, and detects the position of the vehicle. Means (corresponding to “GPS receiver 12”) and connection means (“SD slot 14”, memory card connector, etc.) for connecting a portable external recording medium (corresponding to “SD memory card 15”); An internal storage means (“EEPROM 17”, flash memory, etc.) that is provided inside the in-vehicle electronic device and can retain the stored contents even when no power is supplied from the vehicle side, and the position detection means Storage control means for storing a history of position information based on the detected position in the internal storage means (implemented by “one function of the control unit 18” in the embodiment), and the external recording medium Write control means for writing information based on the history of the position information stored in the internal storage means to the external recording medium via the connection means when connected to the connection means (" And a command input unit (corresponding to “remote control 21, switch unit 7”) for inputting a command from the user, and the storage control unit stores the data in the internal storage unit. The position information history is deleted by the writing control means until an instruction to delete the position information history stored in the internal storage means is input by the instruction input means. even if the information based on the history is written to the external recording medium has a structure that does not perform the deletion of history of the position information stored in the internal storage means, the external recording medium Includes a file management information recording area and a real data storage area managed by the file management information recording area, and has a file system (for example, FAT16) that holds data in units of files, and the storage control means The internal storage means does not have a file management area, and the location information history is continuously stored, and the write control means stores the location information history continuously stored in the internal storage means. A configuration is adopted in which the file is converted into the file compatible with the file system of the external recording medium and written .

  According to the present invention, the position information history is not directly stored in the external recording medium, but the position information history is once stored in the internal storage means, and the internal storage is stored when the external recording medium is connected. Because the information stored in the means is written to the external recording medium, the data in the external recording medium is damaged due to the power supply from the vehicle being cut off while writing to the external recording medium. Even if it exists, the information stored in the internal storage means can be written again to the external recording medium.

Further, an instruction input means for inputting an instruction from the User over THE equipped with ( "remote control 21, the switch section 7" corresponds to), the storage control unit has a function of deleting the history of the position information stored in said internal storage means Until the instruction input means inputs an instruction to delete the position information history stored in the internal storage means, the information based on the position information history is stored in the external recording medium by the write control means. Even if it is written in, since the history of the position information stored in the internal storage means is not deleted , the following operations and effects are achieved.

That is, the position information history stored in the internal storage means is stored in the internal storage means until the user instructs to delete the position information history in the external recording medium. Even if the data in the external recording medium is damaged due to the interruption of the power supply from the vehicle side, the information stored in the internal storage means can be written to the external recording medium again It becomes. In addition, the external recording medium storing the history of position information is removed from the in-vehicle electronic device, and it is carried and set in a personal computer or the like. Then, using the history data of the position information on a personal computer or the like, the movement locus can be displayed on the map information such as Google Earth. In this case, in many cases, the place where the personal computer is installed is far away from the vehicle where the in-vehicle electronic device is installed, and the carrying distance of the external recording medium becomes long. ) And the like, data stored in the external recording medium is likely to be damaged. However, even if the data is damaged, if the history data remains in the internal storage means, the external recording medium can be set in the in-vehicle electronic device and the history data can be written again.

In the present invention, by having a file system that includes a file management information recording area and an actual data storage area managed by the file management information recording area and holds data in units of files, versatility is enhanced. In the case of such a configuration, when the power is turned off at the time of writing a file, not only the data being written but also the information in the file management information area where the file management information is recorded is damaged. However, in the present invention, even if such a situation occurs, the information in the internal storage means can be written again to the external recording medium. So the impact can be minimized.

(2) When the storage control means does not have the file management area in the internal storage means and continuously stores the history of the position information, the storage control means includes the vehicle position information detected by the position detection means. A configuration in which a checksum is calculated and given is continuously recorded.
(3) The external recording medium has a file system that can be written by devices other than the in-vehicle electronic device, the file management information storage area provided in the file system has a file name storage area, and the writing When the connection of the external recording medium to the connecting means is detected, the control means reads the file name of the file stored in the external recording medium from the file management information storage area, and reads the read file name and Should be written with a different file name.

  According to the present invention, it is possible to prevent the file from being overwritten. Further, even if the data has already been recorded on the external recording medium, it is written again with another name, so that a plurality of data having the same contents can be stored, and data destruction can be further prevented.

(4) When the external recording medium is connected to the connection unit, the write control unit automatically stores information based on the history of the position information stored in the internal storage unit. You may make it write in the said external recording medium via a connection means.
(5) A display unit and an instruction input unit are provided, and the write control unit determines whether to start writing information based on the history of the position information stored in the internal storage unit to the external recording medium. Display on the display means, and when a start instruction is input from the instruction input means, information based on the history of the position information is written to the external recording medium via the connection means. Good.
(6) A display means and an instruction input means are provided, a list of the history of the location information stored in the internal storage means is displayed, and designated from among the listed data in accordance with an instruction from the user You may make it provide the function to delete data.

Further, it is determined whether or not the external recording medium is removed from the connection means during writing to the external recording medium or the power supply from the vehicle side is interrupted. The writing control unit may control the writing based on a determination result of the situation determining unit.
As the writing control, for example, when the situation determination unit determines that “the situation is to be removed during writing” or “the situation where the power supply is cut off”, the external recording medium is connected to the connection unit. If it is determined that “it is not in a situation where it is removed during writing” or “it is not in a situation where power supply is cut off”, it is possible to start writing. can do. In this way, it is possible to prevent as much as possible that the power supply is cut off during writing to the external recording medium, resulting in a writing error, and data can be efficiently written when writing can be performed reliably. become. These are specifically configured as follows.
(7) When a GPS receiver is provided as the position detection means, and the writing control means shifts from a positioning state to a non-positioning state, and the state continues for a certain period or more. Alternatively, writing may not be started even when the external recording medium is connected to the connection means.
(8) Provided with travel start detection means for detecting the start of travel after engine start, and the writing control means stores in the internal storage means when the travel start detection means detects start of travel after engine start. You may make it start writing to the said external recording medium based on the history of the said position information memorize | stored.
(9) Based on the invention of (8) above, the determination as to whether or not the vehicle has started traveling may be made on the condition that the vehicle is traveling continuously for a predetermined distance or longer.
(10) Whether road data storage means for storing road data is provided, and whether the position of the vehicle detected by the position detection means corresponds to a position on a predetermined road by road data stored in the road data storage means The write control unit may determine whether to start writing information to the external recording medium based on the history of the position information stored in the internal storage unit.
(11) On the premise of the invention of (10) above, the predetermined road is a service area or a parking area of an expressway, and when it corresponds to the position, the writing control means is the internal storage means. May not start writing information to the external recording medium based on the history of the position information stored in
(12) Providing an approach detecting means for detecting an approach of a part of a person's body, wherein the writing control means is configured to detect the approach when the approach of the part of the person's body is detected by the approach detecting means. Writing may not be started even when a recording medium is connected to the connection means.

Comprising a vehicle speed detecting means for detecting the speed of the vehicles, it said write control means may determine whether or not to carry out the writing on the basis of the vehicle speed detected by said vehicle speed detecting means. For example, the vehicle speed detection means obtains the travel distance from the position information acquired by the position detection means, and may use an elapsed time (which may have an internal clock or use time data included in the position information when obtaining the position information from a GPS signal. The vehicle speed may be calculated from the sensor, or a sensor that directly obtains the vehicle speed may be received separately, or information related to the vehicle speed may be obtained from the vehicle side and derived from there. Alternatively, the vehicle speed may be obtained indirectly such as by measuring a physical quantity that changes according to the vehicle speed, such as a vibration sensor.

  For example, when the vehicle speed exceeds a predetermined writing start reference vehicle speed, the writing is started or when the vehicle speed falls below a predetermined writing prohibition reference vehicle speed, Various modes can be taken such as not starting writing, or stopping writing when the vehicle speed falls below a predetermined writing stop reference vehicle speed during the writing process. If you are traveling at a low speed, there is a risk of stopping and then stopping the engine (power supply cut from the vehicle), so do not write, and conversely if you are traveling at a high speed This is because it is unlikely that the vehicle will stop immediately, so it can be estimated that there is sufficient time for writing. In order to suppress the situation where the writing is stopped when the vehicle speed temporarily decreases due to traffic conditions in the state where writing to the external recording medium is once started, “writing prohibition reference speed”> “ It is recommended to set it as “write stop reference speed”.

Comprising a vehicle speed detecting means for detecting the speed of the vehicles, said storage control means may vehicle speed detected by said vehicle speed detecting means when the predetermined value or less so as not to perform storage to said internal storage means. By doing so, it is possible to prevent destruction of data in the internal storage means.

Comprising a vehicle speed detecting means for detecting the speed of the vehicles, the storage control unit, a history of the position information, which is generated by obtaining from said position detecting means at predetermined time intervals, the predetermined time interval May be configured to control based on the vehicle speed detected by the vehicle speed detecting means.

  Making the position information acquisition interval variable according to the speed, for example, can shorten the time interval as the vehicle speed increases and shorten the time interval as the vehicle speed increases. In this way, even if the vehicle speed is high, the recorded position does not jump out (the density of position history does not become thin), and then the vehicle start locus etc. are accurately displayed with Google Earth etc. Can be made.

  (13) The movement trajectory display system of the present invention provides information based on the vehicle-mounted electronic device according to any one of (1) to (12) above and the history of the position information recorded on the external recording medium. A display device that reads out and displays the movement trajectory of the vehicle on a map based on the information can be provided.

  In the present invention, since the history data of the position information is once stored in the internal storage means and then written to the external recording medium, even if a power supply is interrupted at the time of writing and a writing error occurs, the original internal storage Since correct history data remains in the means, it is possible to write to the external recording medium again in a state where power is supplied thereafter. Accordingly, the history data (log data, logging data) of the position information can be reliably stored and held in the in-vehicle electronic device, and the stored history data can be transferred to a personal computer or the like to display the movement locus.

  FIG. 1 shows an external view of an embodiment of an in-vehicle electronic device according to the present invention, and FIG. 2 shows an internal configuration. The in-vehicle electronic device 1 is a device that acquires current position information of a vehicle and radio wave information that travels from the outside, and issues a warning / notification when the acquired information matches a set condition. The in-vehicle electronic device 1 employs a configuration in which a rectangular second case body 2b that houses various receivers and the like is linked to the back side of the first case body 2a that houses a display panel and the like. The 1st case main body 2a consists of the aspect which made the flat rectangular box stand upright, and attaches the display panel 3 to the front side in the exposed state. The display panel 3 is realized using, for example, an organic EL display or a liquid crystal display. Further, an insertion slot 4 for the SD slot 14 is provided on the side surface of the first case body 2a, and the in-vehicle electronic device 1 stores data by inserting the SD memory card 15 from the insertion slot 4 of the SD slot 14. Data such as position information to be held can be updated. Further, an alarm output device such as a speaker, a control unit and other electronic circuit boards are incorporated in the first case body 2a.

  Further, in the second case main body 2b, the microwave receiver 10 and the radio receiver 11 are disposed inside the tip side opposite to the first case main body 2a, and inside the upper surface side of the second case main body 2b, A GPS receiver 12 is arranged. Information received by each of the receivers 10, 11, and 12 is sent to the control unit 18 on the electronic circuit board provided in the first case body 2a by using the internal wiring. The first case body 2a also includes a speaker 16, a remote control receiver 20, and the like. Further, information on the target (position information including longitude / latitude, type information, etc.) is stored in the database 19. The database 19 can be realized by a nonvolatile memory (for example, EEPROM) in the microcomputer of the control unit 18 or externally attached to the microcomputer. In the database 19, information related to a certain target at the time of shipment (position information including longitude and latitude, type information, etc.) is registered. Further, various position information can be registered / updated in the database 19 according to use.

  Further, a power switch and a DC jack are arranged on one side surface of the case body 1 (the side surface is opposite to FIG. 1A and is not shown in the drawing). The DC jack is for connecting a cigar plug cord (not shown), and is connected to a cigar socket of the vehicle via the cigar plug cord so that power can be supplied.

  The control unit 18 includes a microcomputer including a CPU, a memory, an I / O, and the like, and can access the SD memory card 15 which is an external recording medium mounted in the SD slot 14 to read / write data. For example, when the SD memory card 15 stores the position information of the target to be updated, the control unit 18 reads the data to be updated and stores it in the database 19 to perform the update process.

  Further, the in-vehicle electronic device 1 includes an EEPROM 17 serving as an internal storage unit, and the control unit 18 can access the EEPROM 17 and read / write data. The EEPROM 17 is a non-volatile memory, and can retain stored contents even when power is not supplied from the vehicle side via a DC jack / cigar plug cord.

  The microwave receiver 10 receives a microwave of a predetermined frequency band and sends the received signal to the control unit 18. The predetermined frequency band is, for example, a frequency band including a microwave frequency emitted from the vehicle speed measuring device. The wireless receiver 11 receives incoming radio waves having a predetermined frequency. The remote control receiver 20 performs data communication with the remote control (portable device: slave device) 21 and performs various settings for the in-vehicle electronic device. The switch unit 7 is also connected to the control unit 18 so that the same setting as that of the remote controller 21 can be performed. The GPS receiver 12 receives a GPS signal, obtains a current position from the received GPS signal, and sends position information (longitude, latitude) of the obtained current position to the control unit 18.

  The control unit 18 executes a predetermined process based on information input from the various input devices (receiver or the like), and uses an output device (display panel 3, alarm lamp 13, speaker 16 or the like) to perform a predetermined process. Alarms and messages are output. As the predetermined processing for determining the alarm content based on the information input from the input device, the same basic processing as that in the conventional art can be used. That is, when a signal having a certain condition is received / acquired, a corresponding alarm is output. Note that the alarm using the speaker 16 includes a buzzer and voice.

  Further, the control unit 18 stores a history of position information based on the position detected by the GPS receiver 12 as position detecting means in the EEPROM 17 and an SD memory card 15 as an external recording medium is mounted in the SD slot 14. A function of writing at least a part of the information stored in the EEPROM 17 to the SD memory card 15 mounted in the SD slot 14 when the computer is in operation.

  For example, the function stored in the EEPROM 17 acquires position information based on a GPS signal received by the GPS receiver 12 when a predetermined event occurs, and stores the acquired position information. At this time, time information and other various information may be registered in association with each other. As this predetermined event, for example, an event (e.g., a timer event) that occurs every time a predetermined time elapses, an event that occurs every predetermined travel distance by including travel distance detection means, or the like can be used.

In addition, the position information can be acquired by using the reception of a predetermined radio wave (microwave, radio) as an event, and information indicating which radio wave has been received can be added to the acquired position information and recorded. . By adding information indicating wireless reception to the position information, the wirelessly received position can be displayed on the map. The information indicating radio reception is not limited to information indicating which radio the received radio is, and may include a received frequency, reception intensity, modulation scheme, and the like. For example, when the position information to be written is in the NMEA (National Marine Electronics Association) format, information indicating wireless reception may be written in association with the information in the NMEA format. Here, the NMEA format refers to “NMEA 0183 Interface Standard”, which is ASCII data output in real time from the GPS. Further, the position information to be written is not limited to the NMEA format. For example, the position information to be written may be simply written in a text format (csv format) by delimiting with commas in order of information indicating latitude / longitude, time, and wireless reception. It is particularly preferable to set the output mode of the GPS receiver 12 to the binary mode, take out binary data of latitude / longitude information from the binary data output from the GPS receiver 12 and record it as position information. In this way, the memory usage of the EEPROM 17 can be suppressed.

  The SD memory card 15 includes a file management information recording area and an actual data storage area managed by the file management information recording area, and holds data in units of files (for example, FAT (File Allocation Table) 16). Have The file system here is a storage area having a data structure for storing predetermined data, for example, and is managed by logically dividing a physical storage area along the predetermined data structure, for example. .

  The function stored in the EEPROM 17 of the control unit 18 does not have a special management area and continuously stores position information detected by the GPS receiver 12. To store continuously, for example, the position information at a certain time point and the position information at the next time point may be held continuously. Further, the data structure in the case of continuous storage may be, for example, an array structure or a list structure. In particular, a method of sequentially writing to consecutive addresses in the memory area may be employed. In this way, the position information is sequentially stored in successive addresses of the EEPROM 17 in time series in the order of acquisition. Since data is written in order, even if the power is turned off during writing, basically only one piece of data being written is damaged.

  In addition, the continuous storage of the position information in the EEPROM 17 is performed, for example, by continuously recording the position information detected by the GPS receiver 12 with its checksum added. Also good. If an error detection code or error correction code is generated based on the information stored in this manner and stored in association with the stored information, the reliability of each information may be improved.

  The function of writing to the SD memory card 15 of the control unit 18 reads the history of position information continuously stored in the EEPROM 17, converts it to a file compatible with the file system of the SD memory card 15, and then writes it. ing.

  As described above, the SD memory card 15 includes a file management information recording area and an actual data storage area managed by the file management information recording area, and includes a file system that holds data in units of files. If the power is cut off during writing, information in the file management information area in which file management information of other files is recorded may be damaged. If the information in the file management information area is damaged, the information in the file management area of another file recorded on the SD memory card 15 is also damaged, and other files cannot be read. May become unreadable.

  For example, in the case where the file management information storage area has an area for storing management information related to a plurality of files in one rewrite unit area, if the power is shut down while the file management information is newly written in the unit area, the file management information storage area In some cases, the management area has an invalid value, and some or all files on the recording medium may become inaccessible. For example, in a file system such as FAT, file management information is stored in an area called a file allocation table when a file is written. If the power is turned off while writing a file, the information in the file allocation table will become inconsistent, and the original stored file will not be accessible, and the logical structure of the entire medium will be regenerated (for example, Sometimes you have to do a process called formatting). However, according to the present embodiment, even if such a situation occurs, the SD memory card 15 (reformatted if necessary) is again stored in the EEPROM 17 with the SD slot 14 mounted. Information can be written to the SD memory card 15.

  Further, the determination as to whether or not the SD memory card 15 is inserted into the SD slot 14 is made, for example, at a position where the SD memory card 15 is turned on when the SD memory card 15 is completely inserted into the SD slot 14. This can be realized by providing a switch (such as a limit switch) and making a determination based on ON / OFF of the switch. When this switch is turned on, writing may be automatically started, or when the switch is detected, “Display writing to SD card” is displayed on the display panel 3. May be displayed, and writing may be started when a start instruction is input from the remote controller 21 or the switch unit 7. Further, whether or not to start writing may be determined based on a determination result by a situation determination function described later. The timing at which writing is to be performed may be set in advance from the remote controller 21 or the like.

  As described above, in the present embodiment, since the history data of the position information is not directly written in the SD memory card 15 which is an external recording medium, but is once written in the EEPROM 17, whether or not the SD memory card 15 is attached is determined. Regardless, the position log data which is the history of the position information can be stored in the EEPROM 17. At an appropriate timing when the SD memory card 15 is mounted, the control unit 18 writes one log data stored in the EEPROM 17 to the SD memory card 15. Even if the data in the SD memory card 15 is damaged due to the interruption of the power supply, the data stored in the EEPROM 17 is damaged because only the data is read from the EEPROM 17. Never do. Therefore, the position log data information stored in the EEPROM 17 can be written again to the SD memory card 15 when power is supplied from the vehicle thereafter.

  Then, the SD memory card 15 storing the location log data is taken out, and the SD memory card 15 is carried to a place such as a personal computer, and the location information history data (position log) stored in the personal computer is stored. • Transfer data to the computer. As a result, it is possible to display the trajectory that the user has moved on Google Earth or Google Maps by executing appropriate processing on the personal computer based on the position log data.

  Further, the control unit 18 displays a list of position log data stored in the EEPROM 17 according to instructions from the instruction input means such as the remote controller 21 and the switch unit 7 operated by the user, and lists up according to the instructions from the user. The function to delete the specified data from the specified data is provided. The control unit 18 has a function of deleting history information instructed via the instruction input means from those listed on the display panel 3. In other words, the position information history is written to the SD memory card 15 by the control unit 18 until an instruction to delete the position information history stored in the EEPROM 17 is input by the instruction input means (remote controller 21, switch unit 7, etc.). Even in this case, the position information history stored in the EEPROM 17 is not deleted.

  As described above, since the history of the position information remains stored in the EEPROM 17 until the user instructs to delete, the power supply from the vehicle side is cut off during the writing to the SD memory card 15 as described above. The data in the SD memory card 15 is damaged, or the data in the SD memory card 15 is damaged for some reason while the SD memory card 15 is removed and carried and moved to a relatively long distance to the personal computer. Even in this case, the information stored in the EEPROM 17 can be written again to the SD memory card 15, so that the influence of the damage can be minimized.

  The control unit 18 includes a situation determination function that determines a situation such as whether or not the SD memory card 15 is being removed and whether or not the power supply from the vehicle is cut off. This situation determination function may include both of the above two situation determination functions, or one of them. The operation of the writing function to the SD memory card 15 of the control unit 18 is controlled based on the determination result by the situation determination function. Specifically, the writing to the SD memory card 15 by the control unit 18 is performed on the condition that it is determined that the situation is not “removed” or “blocked” by the situation determining function. In addition, when the situation determination function determines that the “removal” or “blocking” is in progress while writing to the SD memory card 15, the control unit 18 operates to stop writing.

  Here, as a specific aspect of the situation determination function, for example, it is determined whether the GPS receiver 12 is receiving GPS from a GPS satellite (during GPS positioning) or not (not positioning). When the state has been determined so far, the state is shifted to the non-positioning state, and when the state continues for a certain period or longer, it is determined that the power supply is interrupted. If GPS non-positioning continues for a certain period of time, there is a high possibility that the vehicle has entered an indoor parking lot or the like, and it can be determined that the power may be turned off soon after the vehicle stops. Further, when the start of running is detected after the engine is started, it is determined that the power supply is not in a state of being interrupted soon. This is based on the rule of thumb that the engine will not be turned off as soon as it starts running after the engine is started. In addition, there is a case where a car is moved from the garage at home to the road, where it stops and loads are loaded, so whether or not the start of traveling is determined to continue traveling for a predetermined distance or longer. It is more preferable to use conditions. Further, when writing to the SD memory card 15 is started on the condition that the start of running is detected after the engine is started, there is also an accompanying effect that data at the previous running can be reliably copied to the SD memory card. So it is more preferable. Further, road data is stored, and if the current position corresponds to a position on a predetermined road (for example, on a highway) based on the road data, it is determined that the power supply is not in a situation to be interrupted soon. This is based on an empirical rule that it will be rare to turn off the engine on a given road. And while driving on a predetermined road such as an expressway, it is unlikely that the engine will be suddenly turned off and the power supply is cut off. 15 may be started. Conversely, by storing location information such as highway service areas and parking areas, the power supply will soon be turned on when approaching or approaching an area where the current location is likely to stop such as the service area. It can be determined that the supply is interrupted.

  Whether or not the SD memory card 15 is being removed is determined by, for example, providing an eject button for the SD slot 14 (an operation button for taking out the SD memory card 15). When the SD memory card 15 is pushed in without taking the moving stroke and detecting the pushing operation before being taken out or without providing an eject button, the ejecting mechanism provided in the SD slot 14 is operated, and the SD memory card 15 If the SD memory card 15 is pushed back, it can be determined that the SD memory card 15 is in a state of being removed by detecting the pushing of the SD memory card 15. Further, instead of such a mechanical determination, for example, a capacitance sensor or other proximity sensor is mounted, and it is determined whether or not the SD memory card 15 is removed based on the sensor output. You can also. That is, this type of in-vehicle electronic device 1 is attached and supported on a dashboard, a sun visor, or the like, and a human hand is rarely located near the in-vehicle electronic device 1 in a normal use state. And when a human hand moves to the vicinity of the vehicle-mounted electronic device 1, there is a high possibility that the switch part of the vehicle-mounted electronic device 1 is operated or the SD memory card 15 is attached or detached as it is. Therefore, when a sensor that detects the approach of a person (part of the body) such as a built-in capacitance sensor detects the approach of the person, it is determined that the SD memory card 15 is in a state of being removed. Can do.

  The control unit 18 has a function of acquiring the recorded capacity in the SD memory card 15 and displaying it on the display panel 3. These displays may be a memory amount display or a ratio (for example, percentage) display. Further, the remaining capacity may be displayed. This makes it possible to determine whether or not a new SD memory card needs to be installed simply by looking at the display panel (display screen) of the in-vehicle electronic device. In addition, such an output can be provided by using an indicator formed by an LED or the like instead of using a display panel.

  Further, as shown in FIG. 3, vehicle speed detecting means 25 for detecting the speed of the vehicle is provided, and the writing process to the SD memory card 15 in the control unit 18 is controlled (written) based on the vehicle speed detected by the vehicle speed detecting means 25. (Determining the following) For example, the vehicle speed detection means 25 may calculate the vehicle speed based on the travel distance and travel time obtained from the output of the GPS receiver 12, or may be provided with a separate vehicle speed sensor. Furthermore, since the vibration of the vehicle relatively increases as the vehicle speed increases, the vehicle speed is detected indirectly or simply based on the output, although the amount of the object to be detected changes according to the vehicle speed, such as a vibration sensor. It may be a thing. In other words, detecting the vehicle speed in the present invention is not limited to obtaining the speed as an absolute value.

  The function of writing to the SD memory card 15 of the control unit 18 is to start writing when the vehicle speed detected by the vehicle speed detection means 25 (physical quantity corresponding to the vehicle speed) exceeds the start reference vehicle speed, or by the vehicle speed detection means 25 When the detected vehicle speed falls below a predetermined write prohibition reference vehicle speed, the operation is performed so as not to start writing. Further, the writing function stops writing when the vehicle speed detected by the vehicle speed detecting means 25 exceeds the predetermined writing start reference vehicle speed and then the vehicle speed falls below the predetermined writing stop reference vehicle speed. You may make it operate. In the case of cancellation, for example, a process of closing the file by writing up to that point may be performed.

  And these reference speeds are good to determine based on possibility that a vehicle will stop. For example, the writing start reference speed is preferably 30 km / h. Further, when the write start reference speed, the write stop reference speed, and the write prohibition reference speed are provided, the write start reference speed may be set to be higher than the write stop reference speed and the write prohibition reference speed. In this case, the write stop reference speed and the write prohibition reference speed may be the same speed, but the write stop reference speed may be smaller than the write prohibition reference speed. If it does in this way, the situation where writing will be stopped when the vehicle speed falls temporarily by traffic conditions can be controlled. For example, the write prohibition reference speed may be 20 km / h, and the write stop reference speed may be 10 km / h. The vehicle speed detected by the vehicle speed detection means 25 may be an instantaneous speed at the time of detection or an average speed for a certain time.

  Furthermore, the control unit 18 may control writing to the EEPROM 17 based on the output of the vehicle speed detection means 25. For example, when the vehicle speed detected by the vehicle speed detection means 25 is below a predetermined value, the position information is not written to the EEPROM 17. By doing in this way, destruction of the data of EEPROM17 can be prevented. The speed below a predetermined value at which writing is not performed may be the same as the above-described writing stop reference speed (for example, 10 km / h).

  As described above, when the vehicle speed detection means 25 is provided, the control unit 18 can vary the position information acquisition interval (the interval at which the position information is stored in the EEPROM 17) according to the speed. That is, the position information may be detected based on events that occur periodically as described above (a constant time interval, a fixed mileage, etc.), but the “predetermined time interval” is the same reference. Control is not based on time but based on the vehicle speed detected by the vehicle speed detection means 25, that is, for example, the time interval of event occurrence is shortened as the vehicle speed increases. In this way, even if the vehicle speed is high, the recorded position does not skip (the density of the position history does not become thin), and based on the history log data of the finally stored position information When displaying the vehicle's trajectory etc. with Google Earth etc., the movement trajectory can be accurately reproduced.

  Further, the external recording medium is not limited to the SD memory card 15, and may be a medium on which writing is performed after erasing in a predetermined block unit, for example. An example of such a medium is a NAND flash memory. Such a medium needs to be erased in units of a predetermined block. If the power is cut off during writing, the block is erased and data is easily destroyed. According to the configuration of the present application, even if the data in the SD memory card 15 is damaged, the information stored in the EEPROM 17 can be written again to the external recording medium.

  The external recording medium (SD memory card 15) has a file system that can be written by devices other than the on-vehicle electronic devices. The file management information storage area included in the file system has a file name storage area. Also, the writing function to the SD memory card 15 of the control unit 18 reads the file name of the file stored in the SD memory card 15 from the file management information storage area, and the history data of the position information stored in the EEPROM 17 is read. When writing to the SD memory card 15, the file name is different from the read file name. Thereby, overwriting of the file is prevented and the file is not overwritten, so that the possibility of damaging the information stored in the SD memory card 15 can be reduced.

  FIG. 4 shows an embodiment of the movement trajectory display system of the present invention. As shown in the figure, the vehicle-mounted electronic device 1 and a personal computer 30 are provided. Once the necessary location information history data has been written to the SD memory card 15 mounted on the in-vehicle electronic device 1, the SD memory card 15 is removed and the SD memory card 15 is carried to a place such as a personal computer. It is attached to a predetermined card reader 30a to which the personal computer 30 is connected. Then, the user operates the personal computer 30 to transfer the position information history data written in the SD memory card 15 into the personal computer 30 and convert it into a predetermined data format. The trajectory that you have moved can be displayed. Further, based on information indicating radio reception added to the position information, it is possible to display on the map what type of radio is received at which location.

  Data format conversion is performed by uploading to a website that provides the conversion service, or when application software for conversion is installed in the personal computer 30, the application software is used. Can do. Since the SD memory card 15 is one of the external recording media for the personal computer 30, it is not always necessary to transfer the history data of the position information to the storage means in the personal computer as described above, and the SD memory card 15 is accessed. However, data conversion may be performed.

  The vehicle-mounted electronic device to which the present embodiment is applied is not limited to each vehicle-mounted electronic device having the above-described configuration. For example, a microwave detector (radar detector), an infrared detector, and a target detection device , PND (Portable Navigation Device) and the like.

1 is an external view showing a preferred embodiment of a vehicle-mounted electronic device according to the present invention. It is an internal block diagram which shows suitable one Embodiment of the vehicle-mounted electronic device which concerns on this invention. It is an internal block diagram which shows another suitable embodiment of the vehicle-mounted electronic device which concerns on this invention. It is a figure showing one suitable embodiment of a movement locus display system concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle-mounted electronic device 2a 1st case main body 2b 2nd case main body 3 Display panel 4 Insertion port 7 Switch part 10 Microwave receiver 11 Wireless receiver 12 GPS receiver 13 Alarm lamp 14 SD slot (connection means)
15 SD memory card (external recording medium)
16 Speaker 17 EEPROM (internal storage means)
18 Control unit 19 Database 20 Remote control receiver 21 Remote control 25 Vehicle speed detection means 30 Personal computer (display device)

Claims (13)

An in-vehicle electronic device operable by supplying power from the vehicle side,
Position detecting means for detecting the position of the vehicle;
Connection means for connecting a portable external recording medium;
An internal storage means provided inside the in-vehicle electronic device, capable of holding stored contents even when power is not supplied from the vehicle side; and
Storage control means for storing a history of position information based on the position detected by the position detection means in the internal storage means;
Write control for writing information based on the history of the position information stored in the internal storage means to the external recording medium via the connection means when the external recording medium is connected to the connection means Means,
Comprising an instruction input means for inputting an instruction from the user;
The storage control unit has a function of deleting a history of position information stored in the internal storage unit, and until an instruction to delete the history of position information stored in the internal storage unit is input by the instruction input unit Is a configuration in which the position information history stored in the internal storage means is not deleted even when information based on the position information history is written to the external recording medium by the writing control means. Have
The external recording medium includes a file management information recording area, and a file system that holds data in units of files including a real data storage area managed by the file management information recording area,
The storage control means continuously stores the history of the position information without having a file management area in the internal storage means,
The writing control unit has a configuration in which a history of position information continuously stored in the internal storage unit is converted and written into the file suitable for the file system of the external recording medium. Automotive electronic equipment. When the storage control means continuously stores the position information history without the file management area in the internal storage means, the storage control means adds the checksum to the vehicle position information detected by the position detection means. 2. The in-vehicle electronic device according to claim 1, wherein what is calculated and applied is continuously recorded . The external recording medium has a file system that can be written by devices other than the in-vehicle electronic device, and the file management information storage area provided in the file system has a file name storage area,
When the connection of the external recording medium to the connection means is detected, the write control means reads the file name of the file stored in the external recording medium from the file management information storage area and reads it The in-vehicle electronic device according to claim 1, wherein the position information is written with a file name different from the file name.   When the external recording medium is connected to the connection means, the write control means automatically sends information based on the history of the position information stored in the internal storage means to the connection means. Writing to the external recording medium via
  The vehicle-mounted electronic device according to any one of claims 1 to 3.   A display means and an instruction input means;
  The writing control means displays on the display means whether or not to start writing information to the external recording medium based on the history of the position information stored in the internal storage means, and the instruction input When a start instruction is inputted from the means, information based on the history of the position information is written to the external recording medium via the connection means.
  The vehicle-mounted electronic device according to any one of claims 1 to 3.   A display means and an instruction input means;
  It has a function of displaying a list of history of the location information stored in the internal storage means and deleting designated data from the listed data according to an instruction from the user.
  The vehicle-mounted electronic device according to any one of claims 1 to 3.   A GPS receiver is provided as the position detecting means,
  When the GPS receiver is shifted from a positioning state to a non-positioning state and the state continues for a certain period or longer, the writing control unit connects the external recording medium to the connection unit. Does not start writing
  The vehicle-mounted electronic device according to any one of claims 1 to 6.   Provided with a travel start detection means for detecting the travel start after the engine start,
  The writing control means writes information to the external recording medium based on the position information history stored in the internal storage means when the travel start detection means detects the start of running after engine start. To start writing
  The vehicle-mounted electronic device according to any one of claims 1 to 6.   The determination as to whether or not the vehicle has started running is based on the condition that the vehicle is traveling for a predetermined distance or longer or for a predetermined time.
  The vehicle-mounted electronic device according to claim 8.   Road data storage means for storing road data;
  Based on whether the position of the vehicle detected by the position detection means corresponds to a position on a predetermined road based on road data stored in the road data storage means, the writing control means stores the position in the internal storage means. Determining whether to start writing information to the external recording medium based on the history of the stored position information
  The vehicle-mounted electronic device according to any one of claims 1 to 6.   The predetermined road is a service area or a parking area of an expressway, and when it corresponds to the position, the writing control means stores information based on the history of the position information stored in the internal storage means. Do not start writing to the external recording medium
  The vehicle-mounted electronic device of Claim 10 characterized by these.   Providing an approach detection means for detecting the approach of a part of the human body,
  The writing control means does not start writing even when the external recording medium is connected to the connecting means when the approach detecting means detects the approach of a part of a human body.
  The vehicle-mounted electronic device according to any one of claims 1 to 6. The in-vehicle electronic device according to any one of claims 1 to 12,
A movement trajectory display system comprising: a display device that reads information based on the history of the position information recorded on the external recording medium and displays the movement trajectory of the vehicle on a map based on the information.

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