JP2010191773A - Method and system for communicating vehicle position - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce useless communication about a current position of a specified vehicle, in a vehicle position communication system for transmitting sequentially the current position of the specified vehicle, and for displaying the current position on a specified display. <P>SOLUTION: The vehicle position communication method/system transmits the current position of the specified vehicle from an onboard device to a cellular phone, at a transmission interval in response to a scale of a map data displayed on the cellular phone. The transmission interval is a transmission interval to bring an interval between this time display position of the current position of the specified vehicle and the last display position thereof into 0.5 cm, when the specified vehicle travels at 60 km/hr of speed. Thereby the useless communication is reduced since frequent communication is avoided in a state where the display position cannot be discriminated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle position communication method and a vehicle position communication system that sequentially transmit the current location of a specific vehicle to a specific display device and display the current location of the specific vehicle on the specific display device.

  Conventionally, an invention for displaying the current location of a specific vehicle on a specific display device is known (see, for example, Patent Document 1). According to the invention of Patent Document 1, a mobile station (on-vehicle device) provided in a specific vehicle sequentially detects the current location of the specific vehicle. Then, the mobile station sequentially transmits its current location to the control station (specific display device) of the center. The control station receives the current location and displays the current location superimposed on the map data around the current location. When the present invention is applied to a taxi vehicle, for example, the current location of the taxi vehicle is displayed at the center, so that the position of the taxi vehicle can be easily managed.

Japanese Patent Laid-Open No. 5-40899

  Incidentally, Patent Document 1 does not describe any transmission interval when the mobile station transmits the current location of the specific vehicle to the control station. Therefore, for example, when the transmission interval for transmitting the current location of the specific vehicle to the control station is extremely short, the change in the current location of the specific vehicle cannot be distinguished on the map data even though the specific vehicle is moving. obtain. In this case, since the current location from the mobile station to the control station is transmitted many times even though the change of the current location of the specific vehicle cannot be grasped on the map data, it can be said that the waste of communication is great.

  This invention is made | formed in view of the said situation, The subject is providing the vehicle position communication method and vehicle position communication system which can reduce the waste of the communication of the present location of a specific vehicle.

In order to solve the above problem, a vehicle position communication method according to claim 1 includes a current position detecting step of sequentially detecting a current position of a specific vehicle;
A transmission step of sequentially transmitting the current location detected in the current location detection step to a specific display device;
From the map data storage means for storing the map data, the map data acquisition step for acquiring the map data including the current location transmitted in the transmission step;
In the vehicle position communication method comprising: a display step of superimposing the current location transmitted in the transmission step on the map data acquired in the map data acquisition step and sequentially displaying the map on the specific display device.
In the transmission step, the current location is specified at a transmission interval in which the current display position and the previous display position in the map data of the current location displayed in the display step when the specific vehicle is moving can be distinguished. It is a step which transmits to a display apparatus, It is characterized by the above-mentioned.

  According to this, in the transmission step, the current location of the specific vehicle is specified at a transmission interval in which the current location displayed in the display step when the specific vehicle is moving and the display position in the map data of the previous current location can be distinguished. Sent to display device. In other words, the current location of the specific vehicle is not transmitted to the specific display device at such a short transmission interval that the transition of the current location of the specific vehicle cannot be grasped on the map data. Therefore, it is possible to reduce the waste of communication at the current location of the specific vehicle. In particular, when communication is charged, this vehicle position communication method is effective because the communication cost can be reduced.

A vehicle position communication method according to claim 2 is the scale acquisition step of acquiring the scale of the map data according to claim 1,
A transmission interval determination step of determining the transmission interval based on the scale acquired in the scale acquisition step.

  Whether or not the current display position and the previous display position in the map data of the current location of the specific vehicle can be distinguished depends on the scale of the map data. For example, even if the display position can be distinguished on map data of a certain scale, it may not be distinguished on map data of a scale smaller than the scale. Therefore, in claim 2, the transmission interval is determined based on the scale of the map data in the transmission interval determination step. Thereby, even if it is a case where the present location of a specific vehicle is displayed by map data of what scale, the waste of communication of the present location can be reduced.

The vehicle position communication method according to claim 3 is the display device designating step of designating one or more display devices from among the plurality of display devices based on an input operation of the user of the specific vehicle according to claim 1 or 2. With
The specific display device is a display device designated in the display device designation step.

  According to this, since the user of the specific vehicle can designate the display device that displays the current location of the vehicle as the specific display device, the current location of the vehicle is displayed on the display device that is not intended by the user of the specific vehicle. Can be prevented.

According to a fourth aspect of the present invention, in the vehicle position communication method according to any one of the first to third aspects, the current location of the specific vehicle is displayed on the specific display device based on an input operation of a user of the specific display device. And a first determination step for determining whether or not the user of the specific display device desires,
In the transmission step, when it is determined that the first determination step does not desire, the present location is not transmitted.

  According to this, when the user of the specific display device does not desire that the current location of the specific vehicle is displayed on the specific display device, the current location is not transmitted. Therefore, it is possible to prevent troublesomeness caused by displaying the current location on the specific display device even though it is not desired.

A vehicle position communication method according to a fifth aspect of the present invention is the vehicle designation method according to any one of the first to fourth aspects, wherein one or a plurality of vehicles are designated from a plurality of vehicles based on an input operation of a user of the specific display device. With steps,
The specific vehicle is a vehicle designated in the vehicle designation step.

  According to this, since the user of the specific display device can designate the vehicle whose current location is displayed on the specific display device as the specific vehicle, the current location of the vehicle not intended by the user of the specific display device is displayed on the specific display device. Can be prevented.

The vehicle position communication method according to claim 6 is the vehicle position communication method according to any one of claims 1 to 5, wherein the current location of the specific vehicle is displayed on the specific display device based on an input operation of a user of the specific vehicle. A second determination step of determining whether or not the user of the specific vehicle desires,
In the transmission step, when it is determined that the second determination step does not desire, the present location is not transmitted.

  According to this, when the user of the specific vehicle does not desire that the current location of the specific vehicle is displayed on the specific display device, the current location is not transmitted. Accordingly, it is possible to prevent the current location of the vehicle from being displayed on the specific display device that is not intended by the user of the specific vehicle.

A vehicle position communication method according to a seventh aspect includes a destination acquisition step of acquiring a destination of the specific vehicle according to any one of the first to sixth aspects,
In the transmission step, the destination acquired in the destination acquisition step is also transmitted to the specific display device,
In the display step, the destination transmitted in the transmission step is also superimposed on the map data and displayed on the specific display device.

  According to this, since the destination of the specific vehicle is also displayed on the specific display device, the user of the specific display device can grasp where the specific vehicle is heading. And since the destination is superimposed and displayed on the map data, the user of the specific display device determines from the positional relationship between the current position and the destination displayed in the map data until the specific vehicle arrives at the destination. The distance and time can be grasped sensuously.

The vehicle position communication method according to claim 8 is the vehicle position communication method according to any one of claims 1 to 7, wherein the map data storage means stores a plurality of map data having different scales,
In the map data acquisition step, the map data having the largest scale is acquired from the map data storage means among the map data that can display both the current location and the destination in the display step.

  According to this, since the scale of the map data displayed on the specific display device increases as the specific vehicle approaches the destination, the user of the specific display device confirms that the specific vehicle is gradually approaching the destination. Easy to grasp. In addition, the map data on the scale that makes it easy for the user to grasp the positional relationship between the current location of the specific vehicle and the destination, the distance and time until the specific vehicle arrives at the destination, and the like is displayed on the specific display device. Become.

The vehicle position communication method according to claim 9 is the arrival determination step for determining whether or not the specific vehicle has arrived at the destination in any one of claims 1 to 8;
And a notification step of notifying a user of the specific display device that the vehicle has arrived at the specific vehicle destination based on the determination that the vehicle has arrived at the arrival determination step.

  Thereby, the user of the specific display device can know that the specific vehicle has arrived at the destination.

The vehicle position communication method according to claim 10 further comprises an estimated time acquisition step of acquiring an estimated arrival time at which the specific vehicle arrives at a destination in any one of claims 1 to 9,
In the transmission step, the estimated arrival time acquired in the estimated time acquisition step is also transmitted to the specific display device,
In the display step, the estimated arrival time transmitted in the transmission step is also displayed on the specific display device.

  According to this, since the estimated arrival time when the specific vehicle arrives at the destination is displayed on the specific display device, the user can grasp how long the specific vehicle will arrive at the destination on the specific display device. it can.

The vehicle position communication system according to claim 11 is a vehicle position communication system including an in-vehicle device provided in a specific vehicle and a specific display device,
The in-vehicle device is
Current location detection means for sequentially detecting the current location of the specific vehicle;
Transmission means for sequentially transmitting the current location detected by the current location detection means to the specific display device;
The specific display device is:
Map data acquisition means for acquiring map data including the current location transmitted by the transmission means from map data storage means for storing map data;
Display means for displaying the current location transmitted by the transmitting means superimposed on the map data acquired by the map data acquiring means;
The transmission unit of the vehicle-mounted device has a transmission interval in which the current display position and the previous display position in the map data of the current location displayed by the display unit when the specific vehicle is moving can be distinguished, The present location is transmitted to the specific display device. According to this, the same effect as the first aspect can be obtained.

1 is a block diagram showing a schematic configuration of a vehicle position communication system 5. FIG. It is the figure which showed the transmission interval determination table. It is the figure which showed the transmission interval determination table. It is the flowchart which showed the 1st onboard equipment process in 1st embodiment. It is the flowchart which showed the 1st display apparatus process in 1st embodiment. It is the flowchart which showed the 2nd onboard equipment process. It is the flowchart which showed the 2nd display apparatus process. It is the flowchart which showed the 1st display apparatus process in 2nd embodiment. It is the flowchart which showed the 1st onboard equipment process in 2nd embodiment.

(First embodiment)
Next, a vehicle position communication method and a vehicle position communication system according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a vehicle position communication system 5 of the present embodiment. As shown in FIG. 1, the vehicle position communication system 5 of the present embodiment includes an on-vehicle device 1, a plurality of mobile phones 2, and a base station 200 provided in a specific vehicle. Hereinafter, each element will be described in detail.

  As shown in FIG. 1, the vehicle-mounted device 1 includes a control circuit 10, a navigation device 20, a GPS receiver 30, an input device 40, a communication module 50, and an antenna 51. The control circuit 10 includes a CPU 11, a ROM 12, and a RAM 13 that are connected to each other via a bus (not shown). And CPU11 performs various arithmetic processing according to the program memorize | stored in ROM12, utilizing RAM13 which memorize | stores information temporarily. Specifically, the first vehicle-mounted device processing for registering the mobile phone 2 (specific display device) that transmits the current location of the specific vehicle is executed, and the current location of the specific vehicle is transmitted to the mobile phone 2 registered in the processing. Execute second on-vehicle device processing. The details of the first vehicle-mounted device process and the second vehicle-mounted device process will be described later with reference to flowcharts.

  Here, the CPU 11 determines the transmission interval of the current location to be transmitted to the mobile phone 2 based on the scale of the map data displayed on the mobile phone 2 in the second vehicle-mounted device process. Accordingly, the ROM 12 stores a program executed by the CPU 11 and a transmission interval determination table 120 for determining the transmission interval.

  FIG. 2 is a diagram showing the transmission interval determination table 120. As shown in FIG. 2, the transmission interval determination table 120 is provided with a scale column 121 and a transmission interval column 122. The scale column 121 stores the scale of map data displayed on the mobile phone 2. Specifically, scales of “1/1500”, “1/3000”, “1/8000”, “1/21000”, “1/75000”, and “1 / 150,000” are stored. Note that the map data at a scale of “1/1500” is map data that satisfies the relationship “actual distance × (1/1500) = length on map data”. The same relationship holds for other scale map data. When a numerical value corresponding to the denominator of the scale is used as the scale denominator, the scale denominator is large, the scale is small. When the scale denominator is small, the scale is small. That is, among the scales described above, the scale of “1 / 150,000” is the smallest scale, and the scale of “1/1500” is the largest scale.

  The transmission interval column 122 of the transmission interval determination table 120 stores the transmission interval of the current location to be transmitted to the mobile phone 2 corresponding to each scale. In the present embodiment, when a specific vehicle is traveling at a speed of 60 km / h, the transmission interval is such that the interval between the current display position and the previous display position in the map data of the current location of the specific vehicle is 0.5 cm. It has become. For example, in the case of map data with a scale of “1/1500”, the actual distance corresponding to 0.5 cm is “7.5 m”. The time required for the vehicle traveling at 60 km / h to travel “7.5 m” is 7.5 / 60000 × 60 × 60 (seconds) = 0.45 (seconds). Therefore, if the current location of the specific vehicle is transmitted at a transmission interval of 0.45 seconds, the interval between the current display position and the previous display position in the map data of the current location of the specific vehicle is 0.5 cm. The transmission intervals corresponding to other scales are determined in the same manner. That is, the transmission interval corresponding to the scale “1/3000” is “0.9 seconds”, the transmission interval corresponding to the scale “1/8000” is “2.4 seconds”, The transmission interval corresponding to the scale of “1/21000” is “6.3 seconds”. The transmission interval corresponding to the scale “1/75000” is “22.5 seconds”, and the transmission interval corresponding to the scale “1 / 150,000” is “45 seconds”.

  Here, the reason why the interval between the current display position and the previous display position is set to 0.5 cm is to make the interval sufficiently short and to distinguish the display positions. That is, when the vehicle is moving, the transmission interval is set so that the interval between the current display position and the previous display position is sufficiently short so that the transition of the current location of the vehicle can be accurately grasped. It is short. On the other hand, if the transmission interval is too short, for example, the current display position of the current location and the previous display position may be the same position. As described above, it is wasteful to perform transmission of the current location many times in spite of overlapping display positions. Therefore, if the interval between the current display position and the previous display position is 0.5 cm, the display positions can be distinguished from each other, and the transmission interval does not become too short in order to realize the interval (0.5 cm). I have to.

  Returning to FIG. 1, the navigation device 20 is a known navigation device that sequentially detects the current location of a specific vehicle, displays map data around the current location, and superimposes the current location mark on the map data. Is displayed. In addition, the user of the specific vehicle can set a destination with the navigation device 20. When the destination is set, the navigation device 20 searches for the optimum route from the current location to the destination based on the map data, and predicts the estimated arrival time at the destination. After that, the navigation device 20 guides the specific vehicle to arrive at the destination on the optimal route.

  The GPS receiver 30 sequentially receives GPS signals from GPS satellites corresponding to the current location for the navigation device 20 to detect the current location of the specific vehicle. Then, the GPS signal is output to the navigation device 20.

  The input device 40 is a device for a user of a specific vehicle to input various signals to the control circuit 10, and for example, a switch, a remote controller, or a touch panel is used. In the present embodiment, an address (for example, a telephone number or an e-mail address) is determined for the mobile phone 2 that is a target for transmitting the current location of the specific vehicle. And the address can be input with the input device 40, and the mobile telephone 2 which transmits the present location of a specific vehicle can be designated.

  The communication module 50 is a device for communicating with the mobile phone 2, modulates a signal input from the control circuit 10 into a predetermined format, transmits the signal to the mobile phone 2 through the antenna 51, and 2 is demodulated into an original signal and input to the control circuit 10.

  Next, the configuration of the mobile phone 2 shown in FIG. 1 will be described. The mobile phone 2 is a so-called mobile phone and has a function as a known mobile phone. That is, the mobile phone 2 is assigned a telephone number and an e-mail address, and can make a call with other telephones, and can send and receive e-mails with other telephones and PCs. To do. As shown in FIG. 1, the mobile phone 2 has a control circuit 60, a display 70, a communication module 80, an antenna 81, a map data storage device 90, and an input device 100. The control circuit 60 includes a CPU 61, a ROM 62, and a RAM 63 that are connected to each other via a bus (not shown). The CPU 61 executes various arithmetic processes such as a telephone call process and a mail transmission / reception process according to a program stored in the ROM 62 while using the RAM 63 that temporarily stores information. In addition, the control circuit 60 of the present embodiment may execute the first display device process for determining whether or not the vehicle-mounted device 1 may transmit the current location of the specific vehicle, and may transmit the first display device process. Is determined, the second display device process for displaying the current location of the specific vehicle superimposed on the map data is executed. Details of the first display device process and the second display device process will be described later with reference to flowcharts.

  Here, in the second display device process, the CPU 61 changes the scale of the map data to be displayed according to the distance between the current location of the specific vehicle and the destination. Therefore, the ROM 62 stores a program executed by the CPU 61 and a scale determination table 620 for determining the scale of map data to be displayed.

  FIG. 3 is a diagram showing the scale determination table 620. As shown in FIG. 3, the scale determination table 620 is provided with a remaining distance column 621 and a scale column 622. The remaining distance column 621 stores the range of the remaining distance between the current location and the destination of the specific vehicle. Specifically, “0 m to 45 m”, “46 m to 90 m”, “91 m to 240 m”, “241 m” are stored. ˜630 m ”,“ 631 m˜2250 m ”, and“ 2251 m˜ ”are stored.

  The scale column 622 stores the scale of the map data for each range of the remaining distance between the current location and the destination of the specific vehicle stored in the remaining distance column 621. Specifically, the remaining distance “0 m to 45 m” is associated with a scale of “1/1500”, and the remaining distance “46 m to 90 m” is associated with a scale of “1/3000”. The distance “91 m to 240 m” is associated with a scale of “1/8000”. The remaining distance “241 m to 630 m” is associated with the scale “1/21000”, the remaining distance “631 m to 2250 m” is associated with the scale “1/75000”, and the remaining distance “2251 m to "Is associated with a scale of" 1 / 150,000 ". Thus, as the remaining distance becomes smaller, map data with a larger scale is associated.

  Here, 45 m of the remaining distance “0 m to 45 m” is a distance corresponding to 3 cm of the map data with a scale of “1/1500”. Therefore, when the current location and the destination of the specific vehicle are displayed on the map data with a scale of “1/1500” within the range of “0 m to 45 m”, the current location and the destination on the map data are displayed. The difference in display position is less than 3 cm. That is, considering the size of the display 60 of the mobile phone 2 (assuming that one side is about 3 cm), the map data with a scale of “1/1500” is the current location and the destination in the range of the remaining distance of “0 m to 45 m”. Both are map data of the maximum scale that can be displayed simultaneously.

  Further, 90 m of the remaining distance “46 m to 90 m” is a distance corresponding to 3 cm of the map data with a scale of “1/3000”. Therefore, if the current location and the destination of the specific vehicle are displayed on the map data with a scale of “1/3000” within the range of “46 m to 90 m”, the current location and the destination on the map data are displayed. The difference in display position is less than 3 cm. That is, considering the size of the display 60 of the mobile phone 2 (assuming that one side is about 3 cm), the map data with a scale of “1/3000” is the current location and the destination in the range of “46 m to 90 m” in the remaining distance. Both are map data of the maximum scale that can be displayed simultaneously.

  Further, 240 m of the remaining distance “91 m to 240 m” is a distance corresponding to 3 cm of the map data with a scale of “1/8000”. Therefore, if the current location and the destination of the specific vehicle are displayed on the map data at a scale of “1/8000” within the range of “91 m to 240 m”, the current location and the destination on the map data are displayed. The difference in display position is less than 3 cm. That is, in consideration of the size of the display 60 of the mobile phone 2 (assuming that one side is about 3 cm), the map data at a scale of “1/8000” is the current location and the destination in the range of “91 m to 240 m”. Both are map data of the maximum scale that can be displayed simultaneously.

  Further, 630 m of the remaining distance “241 m to 630 m” is a distance corresponding to 3 cm of the map data with the scale of “1/21000”. Therefore, if the current location and the destination of the specific vehicle are displayed on the map data of the scale of “1/21000” within the range of “241 m to 630 m”, the current location and the destination on the map data are displayed. The difference in display position is less than 3 cm. That is, in consideration of the size of the display 60 of the mobile phone 2 (assuming that one side is about 3 cm), the map data with a scale of “1/21000” is the current location and the destination in the range of “241 m to 630 m”. Both are map data of the maximum scale that can be displayed simultaneously.

  Further, 2250 m of the remaining distance “631 to 2250 m” is a distance corresponding to 3 cm of the map data of the scale of “1/75000”. Therefore, when the current distance and the destination of the specific vehicle are displayed on the map data of the scale of “1/75000” within the range of “631 m to 2250 m”, the current position and the destination on the map data are displayed. The difference in display position is less than 3 cm. That is, in consideration of the size of the display 60 of the mobile phone 2 (assuming that one side is about 3 cm), the map data with a scale of “1/75000” is the current location and the destination in the range of “631 m to 2250 m”. Both are map data of the maximum scale that can be displayed simultaneously.

  Thus, in each remaining distance “0 m to 45 m”, “46 m to 90 m”, “91 m to 240 m”, “241 m to 630 m”, and “631 m to 2250 m”, the maximum that can display both the current location and the destination simultaneously. Map data of a reduced scale is associated.

  The display 70 is a liquid crystal display or an organic EL display, and displays various information such as displaying the telephone number of the other party when making a call or displaying an e-mail. Moreover, the display 70 of this embodiment can display map data, and can also display the present location of a specific vehicle superimposed on the map data.

  The communication module 80 is a device for communicating with other telephones when making a call. The communication module 80 modulates a voice signal input from the control circuit 60 into a predetermined format and transmits it to the other telephones with the antenna 81. At the same time, an audio signal transmitted from another telephone and modulated in a predetermined format received by the antenna 81 is demodulated into an original audio signal and input to the control circuit 60. Further, when an electronic mail is transmitted / received to / from another telephone or PC, the communication module 80 performs modulation / demodulation of the electronic mail for communication. Furthermore, the mobile phone 2 of the present embodiment can communicate with the vehicle-mounted device 1, and the communication module 80 executes processing such as modulation / demodulation during the communication.

  The map data storage device 90 functions as “map data storage means” of the present invention, and stores map data to be displayed on the display 70. Further, the map data storage device 90 stores a plurality of map data having different scales, specifically, “1/1500”, “1/3000”, “1/8000”, which are the same as the scale shown in FIG. ”,“ 1/21000 ”,“ 1/75000 ”, and“ 1 / 150,000 ”scale map data is stored.

  The input device 100 is a device for the user of the mobile phone 2 to input various signals to the control circuit 60. For example, a push switch or a cross key to which numbers or alphabets are assigned is used. With the input device 100, for example, the telephone number of the other party can be input at the time of a call, the mail address of the destination can be input at the time of sending / receiving e-mails, and the mail text can be input. In the present embodiment, the user of the mobile phone 2 can scroll the map data displayed on the display 70 with the input device 100, and can also specify the scale of the map data to be displayed.

  The vehicle position communication system 1 according to the present embodiment includes a plurality of mobile phones 2 having the above-described configuration, and each mobile phone 2 is assigned a unique address (such as a telephone number or a mail address).

  A base station 200 shown in FIG. 1 plays a role of relaying communication between the vehicle-mounted device 1 and the mobile phone 2. By relaying communication at the base station 200, communication is prevented from being interrupted even if the communication distance is increased. When transmitting data from the vehicle-mounted device 1 to a specific mobile phone 2, the base station 200 refers to the address of the mobile phone 2 and modulates the data so that only the mobile phone 2 can receive the data. Yes. The base station 200 has a communication range of several kilometers. A plurality of base stations 200 are scattered in a wide range so that the vehicle-mounted device 1 and the mobile phone 2 can communicate over a wide range.

  Next, the first vehicle-mounted device process for registering the mobile phone 2 (specific display device) that transmits the current location of the specific vehicle, executed by the vehicle-mounted device 1, will be described with reference to a flowchart. Further, the first display device process that is executed by the mobile phone 2 and responds to the first vehicle-mounted device process and determines whether the vehicle-mounted device 1 may transmit the current location of the specific vehicle is also shown in a flowchart. The description will be given with reference.

  FIG. 4 is a flowchart showing the first vehicle-mounted device process, and FIG. 5 is a flowchart showing the first display device process. 4 is executed every time a start signal is input from the input device 40, and the first display device processing in FIG. 5 is executed at regular intervals.

  First, the control circuit 10 of the vehicle-mounted device 1 designates the mobile phone 2 that transmits the current location of the specific vehicle from the plurality of mobile phones 2 in step S11 of FIG. Specifically, the user of the specific vehicle is prompted to input the address of the mobile phone 2 that transmits the current location of the specific vehicle using the input device 40. Then, the mobile phone 2 corresponding to the address input from the input device 40 is designated. Step S11 is a process corresponding to the “display device designation step” of the present invention.

  In subsequent step S12, the control circuit 10 of the vehicle-mounted device 1 transmits a transmission notification signal for requesting transmission of the current location of the specific vehicle to the mobile phone 2 designated in step S11. At this time, the address of the cellular phone 2 is attached and the transmission notification signal is transmitted. Then, the base station 200 modulates the transmission notification signal according to the address attached to the transmission notification signal. Only the designated mobile phone 2 can receive the transmission notification signal.

  On the other hand, the control circuit 60 of the mobile phone 2 determines whether or not the transmission notification signal has been received in step S21 of FIG. Until a transmission notification signal is received, a standby state is set (S21: NO). If the transmission notification signal is received (S21: YES), in step S22, the user of the mobile phone 2 is notified of the reception of the transmission notification signal through the display 70 or the like, and the current location of the specific vehicle is mounted on the user. A determination is made as to whether the device 1 is allowed to transmit (S22). At this time, the user of the mobile phone 2 can input a transmission permission / inhibition signal indicating whether or not the transmission can be performed by the input device 100. In subsequent step S23, the transmission permission / inhibition signal is transmitted to the vehicle-mounted device 1. Note that steps S12 and S13 in FIG. 4 and steps S21 to S23 in FIG. 5 are processes corresponding to the “first determination step” of the present invention.

  The control circuit 10 of the vehicle-mounted device 1 receives the transmission permission signal in step S13 of FIG. In step S14, it is determined whether the transmission permission signal is a transmission permission signal indicating that the current location of the specific vehicle may be transmitted or a transmission permission signal indicating that transmission is not allowed. If the transmission permission / inhibition signal is a transmission rejection signal, the first vehicle-mounted device processing in FIG. In this case, the second vehicle-mounted device process described later is not executed, and the current location of the specific vehicle is not transmitted to the mobile phone 2.

  On the other hand, if the transmission permission signal is a transmission permission signal in step S14, a scale request signal for inquiring the scale of map data displayed on the display 70 of the mobile phone 2 is transmitted to the mobile phone 2 in step S15.

  In step S24 of FIG. 5, the control circuit 60 of the mobile phone 2 determines whether the transmission permission signal transmitted to the vehicle-mounted device 1 in step S23 is a transmission permission signal indicating that the current location of the specific vehicle may be transmitted. It is determined whether it is a transmission reject signal indicating that it should not be performed. If the transmission permission signal is a transmission rejection signal, the first display device process of FIG. On the other hand, if the transmission permission signal is a transmission permission signal, the scale request signal transmitted from the vehicle-mounted device 1 is received in step S25. Based on the scale request signal, the scale of the map data when displaying the current location of the specific vehicle is acquired. The scale acquired at this time may be a scale selected by the user of the mobile phone 2 or may be a scale predetermined as a default. In subsequent step S26, a scale response signal indicating the acquired scale is transmitted to the vehicle-mounted device 1, and the first display device process of FIG. 5 is completed.

  On the other hand, the control circuit 10 of the vehicle-mounted device 1 receives the scale response signal in step S16 of FIG. Note that steps S15 and S16 in FIG. 4 and steps S25 and S26 in FIG. 5 are processes corresponding to the “scale acquisition step” of the present invention.

  The subsequent step S17 is processing corresponding to the “transmission interval determination step” of the present invention, and the transmission interval corresponding to the scale indicated by the scale response signal is determined with reference to the transmission interval determination table 130 of FIG. . For example, when the scale indicated by the scale response signal is “1/3000”, the transmission interval of “0.9 seconds” is determined. In subsequent step S18, the mobile phone 2 is registered by storing the address of the mobile phone 2 and the transmission interval determined in step S17 in the RAM 13. Thereafter, the first vehicle-mounted device process in FIG. 4 ends.

  Next, the 2nd onboard equipment process which transmits the present location of a specific vehicle to the mobile telephone 2 registered by the 1st onboard equipment process which the onboard equipment 1 performs is demonstrated with reference to a flowchart. At the same time, the second display device process executed by the mobile phone 2 and displaying the current location of the specific vehicle transmitted from the vehicle-mounted device 1 superimposed on the map data will be described with reference to a flowchart. FIG. 6 is a flowchart showing the second vehicle-mounted device process, and FIG. 7 is a flowchart showing the second display device process. The second vehicle-mounted device process is executed at regular intervals thereafter when there is a registered mobile phone 2 in the first vehicle-mounted device process. Further, the second display device process is executed at regular intervals thereafter when it is determined in the first display device process that the current location of the specific vehicle may be transmitted.

  First, the control circuit 10 of the vehicle-mounted device 1 sets a timer (not shown) and starts measuring time in step S31 of FIG. The subsequent step S32 is processing corresponding to the “present location detection step” and “present location detection means” of the present invention, and the navigation device 20 of the vehicle-mounted device 1 determines the specific vehicle based on the GPS signal from the GPS receiver 30. The current location is detected and the current location is output to the control circuit 10. The subsequent step S33 is processing corresponding to the “destination acquisition step” of the present invention, and the control circuit 10 acquires the destination of the specific vehicle from the navigation device 20. The subsequent step S34 is a process corresponding to the “estimated time acquisition step” of the present invention, and the control circuit 10 acquires the estimated arrival time of the specific vehicle at the destination from the navigation device 20. In step S35, it is determined whether or not the measured time of the timer has passed the transmission interval time stored in the RAM 13. Here, until the time measured by the timer passes the transmission interval (S35: NO), the current location, the destination, and the estimated arrival time of the specific vehicle are continuously acquired (S32 to S34). When the time measured by the timer has passed the transmission interval (S35: YES), the timer is reset in step S36 and the time measurement is stopped. In subsequent step S37, the address of the mobile phone 2 stored in the RAM 13 is referred to, and the current location, destination, and estimated arrival time of the latest specific vehicle are transmitted to the mobile phone 2. Thereafter, the process proceeds to step S38. Steps S31, S35, S36, and S37 are processes corresponding to “transmission step” and “transmission means” of the present invention.

  On the other hand, the control circuit 60 of the mobile phone 2 determines whether or not the current location, the destination, and the estimated arrival time of the specific vehicle transmitted from the vehicle-mounted device 1 are received in step S51 of FIG. If received (S51: YES), in step S52, the map data around the current location received in step S51 is acquired from the map data storage device 90. At this time, with reference to the scale determination table 620 in FIG. 3, map data of a scale corresponding to the remaining distance calculated in step S54 described later is acquired. For example, when the remaining distance is 300 m, map data of a scale “1/21000” corresponding to the remaining distance “241 m to 630 m” in the scale determination table 620 of FIG. 3 is acquired. In the initial stage after the second display device process is started, step S54 may not be executed before step S52. In this case, in step S52, map data with a default scale is acquired. Alternatively, when the user of the mobile phone 2 designates the scale of the map data with the input device 100, the map data of that scale is acquired in step S52. Step S52 is processing corresponding to the “map data acquisition step” and “map data acquisition means” of the present invention.

  In step S53, the map data acquired in step S52 is displayed, and the current location and destination of the specific vehicle are also displayed superimposed on the map data. Step S53 is processing corresponding to the “display step” and “display means” of the present invention. In the previous step S52, map data of a scale that can display both the current location and the destination at the same time is acquired. The displayed map data is the maximum scale that can display the current location and the destination at the same time. Thereby, the user of the mobile phone 2 can grasp the current location and the destination of the specific vehicle on the map data at the same time, and further, the map data has a large scale. It becomes easy to grasp.

  When the map data at the default scale or the map data at the scale specified by the user of the mobile phone 2 is acquired in the previous step S52, both the current location and the destination may not be displayed on the map data at the same time. . In this case, in step S53, the map data is displayed so that the current location of the specific vehicle is at the center of the display 70. Then, the user of the mobile phone 2 can scroll the displayed map data with the input device 100. At that time, when the destination is included in the map data displayed on the display 70, the destination is displayed superimposed on the map data. Thereby, the user of the mobile phone 2 can grasp the current location and the destination of the specific vehicle on the map data.

  In step S53, the estimated arrival time received in step S51 is also displayed on the display. Thereby, the user of the mobile phone 2 can grasp how long the specific vehicle will arrive at the destination by time.

  Thereafter, in step S54, the remaining distance between the current location and the destination is calculated. In step S55, it is determined whether or not the scale of the map data displayed on the display 70 is to be changed. Specifically, when the scale of the map data acquired in the previous step S52 is compared with the scale corresponding to the remaining distance calculated in step S54 (see FIG. 3) and the scales are different. Judge to change the scale. That is, the scale is automatically changed as the remaining distance changes. Since the scale after the change is the maximum scale that can display both the current location and the destination at the same time, the user of the mobile phone 2 always displays the current location and the destination of the specific vehicle at the same time even if the remaining distance changes. It can be grasped on the map data. Furthermore, since the scale of the map data is large, it is easy to grasp the current location, the vicinity of the destination, and the positional relationship between the current location and the destination.

  In step S55, even when the user of the mobile phone 2 designates a scale different from the scale of the map data acquired in the previous step S52 using the input device 100, it is determined that the scale is to be changed. This is because the user of the mobile phone 2 may not want to change the scale of the map data automatically based on the remaining distance.

  If the scale is to be changed in step S55 (S55: YES), the scale after change is notified to the vehicle-mounted device 1 in step S56, and the process proceeds to step S57. If the scale is not changed in step S55 (S55: NO), the process directly proceeds to step S57.

  Moreover, in step S51, while not receiving the present location, the destination, and the estimated arrival time of the specific vehicle from the vehicle-mounted device 1 (S51: NO), the processing of steps S52 to S54 described above is not executed, The display will be maintained. However, the scale of the map data to be displayed may be changed by the user of the mobile phone 2. Therefore, even when the current location, the destination, and the estimated arrival time of the specific vehicle are not received from the vehicle-mounted device 1 (S51: NO), the processes of steps S55 and S56 are executed.

  On the other hand, the control circuit 10 of the vehicle-mounted device 1 determines whether or not a notification for changing the scale of the map data is received from the mobile phone 2 in step S38 of FIG. When a notice for changing the scale of the map data is received (S38: YES), in step S39, the transmission interval corresponding to the scale after the change is determined with reference to the transmission interval determination table 120 of FIG. For example, when the scale of the map data is changed from “1/8000” to “1/3000”, the transmission interval is changed from “2.4 seconds” to “0.9 seconds”. After step S39, the process proceeds to step S40. In step S38, when the notification for changing the scale of the map data is not received (S38: NO), the process proceeds to step S40. Note that step S38 in FIG. 6 and steps S55 and S56 in FIG. 7 are processes corresponding to the “scale acquisition step” of the present invention. Step S39 is also a process corresponding to the “transmission interval determining step” of the present invention.

  Step S40 is processing corresponding to the “arrival determination step” of the present invention, and it is determined whether the specific vehicle has arrived at the destination by comparing the current location of the specific vehicle with the destination. When the specific vehicle has not yet arrived at the destination (S40: NO), the process returns to step S31, and the processes of steps S31 to S40 described above are executed. That is, the current location, the destination, and the estimated arrival time of the specific vehicle are transmitted to the mobile phone 2 at every transmission interval. This transmission interval is determined based on the scale of the map data displayed on the mobile phone 2, and when the specific vehicle is traveling at a speed of 60 km / h, the current display position of the specific vehicle and the previous display position are determined. The transmission interval is such that the interval from the display position is 0.5 cm. Thus, since the display position interval “0.5 cm” is not so large, the user of the mobile phone 2 can accurately grasp the transition of the current location of the specific vehicle. Further, the display position interval “0.5 cm” is considered to be an interval at which the current display position and the previous display position can be distinguished. Therefore, since the display position cannot be distinguished, communication is not performed many times, so that waste of communication can be reduced.

  When the scale of the map data displayed on the mobile phone 2 is changed (S38: YES), the transmission interval is determined based on the scale after the change (S39). Therefore, even if the scale is changed, it is possible to accurately grasp the transition of the current location of the specific vehicle and reduce waste of communication.

  On the other hand, when the specific vehicle arrives at the destination in step S40 (S40: YES), the mobile phone 2 is notified of arrival in step S41. In step S42, the registration of the mobile phone 2 is canceled by deleting the address of the mobile phone 2 stored in the RAM 13. Then, the 2nd onboard equipment process of FIG. 6 is complete | finished.

  On the other hand, the control circuit 60 of the mobile phone 2 determines whether or not the arrival notification that the specific vehicle has arrived at the destination is made from the vehicle-mounted device 1 in step S57 of FIG. While arrival notification is not made (S57: NO), the process returns to step S51, and the processes of steps S51 to S57 described above are executed. That is, the current location, the destination, and the estimated arrival time of the specific vehicle sequentially transmitted from the vehicle-mounted device 1 are received (S51: YES) and superimposed on the map data of a scale corresponding to the remaining distance between the current location and the destination. The current location and destination are displayed (S52, S53). At this time, the transmission interval at which the current location, the destination, and the estimated arrival time of the specific vehicle are transmitted is determined based on the scale of the map data to be displayed. That is, when the specific vehicle is traveling at 60 km / h, the interval between the current display position and the previous display position of the current location of the specific vehicle is 0.5 cm. Thus, since the display position interval “0.5 cm” is not so large, the user of the mobile phone 2 can accurately grasp the transition of the current location of the specific vehicle. Further, since the display position interval “0.5 cm” is not too small, waste of communication can be reduced.

  If the arrival notification is made from the vehicle-mounted device 1 in step S57 (S57: YES), the user of the mobile phone 2 is notified in step S58 that the specific vehicle has arrived at the destination by display, sound, vibration or the like. To do. Thereby, the user of the mobile phone 2 can know that the specific vehicle has arrived at the destination. Thereafter, the second display device process of FIG. 7 is terminated. Steps S57 and S58 are processes corresponding to the “notification step” of the present invention.

  As described above, according to the vehicle position communication system 1 of the present embodiment, the mobile phone 2 displays both the current location and the destination of the specific vehicle superimposed on the map data at the same time. Therefore, the user of the mobile phone 2 can grasp the current location and the destination of the specific vehicle on the map data at the same time, so that it becomes easy to grasp the positional relationship between the current location and the destination.

  In addition, the current location, the destination, and the estimated arrival time of the specific vehicle are transmitted from the vehicle-mounted device 1 to the mobile phone 2 at transmission intervals corresponding to the scale of the map data displayed on the mobile phone 2. This transmission interval is a transmission interval such that when the specific vehicle is traveling at a speed of 60 km / h, the interval between the current display position and the previous display position of the current location of the specific vehicle is 0.5 cm. Thus, since the display position interval “0.5 cm” is not so large, the user of the mobile phone 2 can accurately grasp the transition of the current location of the specific vehicle. Further, the display position interval “0.5 cm” is considered to be an interval at which the current display position and the previous display position can be distinguished. Therefore, since the display position cannot be distinguished, communication is not performed many times, so that waste of communication can be reduced.

  When the scale of the map data displayed on the mobile phone 2 is changed, the transmission interval is determined based on the changed scale. Therefore, even if the scale is changed, it is possible to accurately grasp the transition of the current location of the specific vehicle and reduce waste of communication.

  Further, the scale of the map data displayed on the mobile phone 2 is automatically changed as the remaining distance between the current location and the destination of the specific vehicle changes. Since the scale after the change is the maximum scale that can display both the current location and the destination at the same time, the user of the mobile phone 2 always displays the current location and the destination of the specific vehicle at the same time even if the remaining distance changes. It can be grasped on the map data. Furthermore, since the scale of the map data is large, it is easy to grasp the current location, the vicinity of the destination, and the positional relationship between the current location and the destination.

  In addition, the display 70 of the mobile phone 2 also displays an estimated arrival time when the specific vehicle arrives at the destination. Thereby, the user of the mobile phone 2 can grasp how long the specific vehicle will arrive at the destination by time.

  In addition, the user of the specific vehicle can designate the mobile phone 2 that transmits the current location. The vehicle-mounted device 1 transmits the current location of the specific vehicle only to the designated mobile phone 2. Therefore, it is possible to prevent the current location of the vehicle from being displayed on the mobile phone 2 that is not intended by the user of the specific vehicle.

  Further, when the user of the mobile phone 2 does not desire that the current location of the specific vehicle is displayed on the mobile phone 2, the current location is not transmitted. Therefore, it is possible to prevent troublesomeness caused by displaying the current location on the mobile phone 2 even though it is not desired.

When the specific vehicle arrives at the destination, the mobile phone 2 notifies the user of the mobile phone 2 of the fact. Thereby, the user of the mobile phone 2 can know that the specific vehicle has arrived at the destination.
(Second embodiment)
Next, a vehicle position communication method and a vehicle position communication system according to a second embodiment of the present invention will be described with reference to the drawings. In the first embodiment, the user of the specific vehicle designates the mobile phone 2 that transmits the current location of the specific vehicle. However, in the present embodiment, the user of the mobile phone 2 selects the vehicle for which the current location is desired to be transmitted. It can be specified. Hereinafter, the present embodiment will be described with a focus on differences from the first embodiment.

  The configuration of the vehicle position communication system 5 of the present embodiment is the same as that of the first embodiment shown in FIG. However, identification information for identifying the other vehicle is assigned to the vehicle of the present embodiment. The base station 200 modulates information transmitted from the mobile phone 2 according to the identification information. The communication module 50 of the vehicle-mounted device 1 receives from the base station 200 only information corresponding to the identification information of the vehicle on which the vehicle-mounted device 1 is provided. In this way, the mobile phone 2 communicates only with a specific vehicle. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  Moreover, in the vehicle position communication system of this embodiment, the control circuit 10 of the onboard equipment 1 performs the 1st onboard equipment process of FIG. 9 instead of the 1st onboard equipment process of FIG. Further, the control circuit 60 of the mobile phone 2 executes the first display device process of FIG. 8 instead of the first display device process of FIG. Hereinafter, the first display device process of FIG. 8 and the first vehicle-mounted device process of FIG. 9 will be described. Note that the first display device process in FIG. 8 is executed each time the start switch is operated by the user of the mobile phone 2. Further, the first display device process of FIG. 9 is executed at regular intervals. In FIG. 8 and FIG. 9, the same processes as those in the first embodiment are denoted by the same reference numerals.

  First, in step S61 in FIG. 8, the control circuit 60 of the mobile phone 2 designates a vehicle (specific vehicle) for which transmission of the current location is desired from a plurality of vehicles. Specifically, the user of the mobile phone 2 is urged to input the identification information of the vehicle desired to transmit the current location with the input device 100. And the vehicle corresponding to the identification information input from the input device 100 is designated. Step S61 is a process corresponding to the “vehicle designation step” of the present invention.

  In subsequent step S62, a transmission notification signal for notifying that the transmission of the current location is desired is transmitted to the specific vehicle designated in step S61. At this time, identification information of the specific vehicle is attached and the transmission notification signal is transmitted. Then, the transmission notification signal is modulated by base station 200 in accordance with the identification information attached to the transmission notification signal. And only the designated specific vehicle can receive the transmission notification signal. Thereafter, the process proceeds to step S63.

  On the other hand, the control circuit 10 of the specific vehicle determines whether or not the transmission notification signal has been received in step S71 of FIG. Until the transmission notification signal is received, the standby state is set (S71: NO). When the transmission notification signal is received (S71: YES), in step S72, the user of the specific vehicle is notified of the reception of the transmission notification signal on the display or the like of the navigation device 20, and the current location of the specific vehicle is notified to the user. To determine whether or not to transmit (S72). At this time, the user of the specific vehicle can input a transmission permission / inhibition signal indicating whether or not transmission is performed using the input device 40. In subsequent step S73, the transmission permission signal is transmitted to the vehicle-mounted device 1. Thereafter, the same processing as in the first embodiment is executed. That is, when the transmission permission signal is a transmission permission signal, the scale of the map data is acquired from the mobile phone 2, and the transmission interval corresponding to the scale is determined (S15 to S17). Then, the mobile phone 2 is registered (S18).

  The control circuit 60 of the mobile phone 2 receives the transmission permission signal in step S63 of FIG. Thereafter, the same processing as in the first embodiment is executed. That is, when the transmission permission signal is a transmission permission signal, the scale is transmitted to the vehicle-mounted device 1 (S25, S26). Note that steps S62 and S63 in FIG. 8 and steps S71 to S73 in FIG. 9 are processes corresponding to the “second determination step” of the present invention.

  Then, the onboard equipment 1 performs the same 2nd onboard equipment process as 1st embodiment shown in FIG. 6, and the mobile telephone 2 performs the same 2nd display apparatus process as 1st embodiment shown in FIG. That is, the current location of the specific vehicle is displayed on the mobile phone 2.

  As described above, according to the vehicle position communication system 1 of the present embodiment, the user of the mobile phone 2 can specify a vehicle for which transmission of the current location is desired. Thereby, it is possible to prevent the current location of the vehicle unintended by the user of the mobile phone 2 from being displayed on the mobile phone 2.

  Further, when the user of the specific vehicle does not desire that the current location of the specific vehicle is displayed on the mobile phone 2, the current location is not transmitted. Therefore, it is possible to prevent the current location of the vehicle from being displayed on the mobile phone 2 that is not intended by the user of the specific vehicle.

  Note that the vehicle position communication system and the vehicle position communication method according to the present invention are not limited to the above-described embodiment, and can be modified within the scope of the invention. For example, the specific display device may be applied to another display device instead of the mobile phone 2. For example, a display device installed in a vehicle may be used as the specific display device. In this case, the vehicle-mounted device 1 also has a function as a specific display device, and the display device also has a function as the vehicle-mounted device 1, thereby grasping the current location of other vehicles with each other when touring with an automobile. be able to.

  In the above embodiment, the current location of the specific vehicle is detected by radio wave navigation using a GPS signal, but may be detected by self-contained navigation using a vehicle speed sensor, a steering angle sensor, or the like.

  In the above embodiment, when the specific vehicle is traveling at a speed of 60 km / h, the interval between the current display position and the previous display position of the specific vehicle is 0 as the transmission interval of the current position transmitted to the mobile phone 2. The present location was transmitted to the mobile phone 2 at a transmission interval of .5 cm. This “0.5 cm” is a value determined so that the user of the mobile phone 2 can accurately grasp the transition of the current location of the specific vehicle and can distinguish the current display position from the previous display position. It is. Therefore, it is not limited to “0.5 cm” without departing from such a purpose. Further, the transmission interval may be determined based on another speed instead of the above-mentioned 60 km / h. That is, the transmission interval may be determined in any way as long as the transition of the current location of the specific vehicle can be accurately grasped and waste of communication can be reduced.

  Moreover, in the said embodiment, although the map data of the largest scale which can display both a present location and a destination simultaneously was displayed with the mobile telephone 2, it cannot be overemphasized that map data of any scale may be displayed. That is, the relationship between the remaining distance and the scale of the map data to be displayed is not limited to the scale determination table 620 in FIG. The scale determination table 620 in FIG. 3 is determined in consideration of the size of the display 70 of the mobile phone 2 (assuming one side is approximately 3 cm), but when another display device is used as the specific display device. Since the display size changes, the relationship between the remaining distance and the scale of the map data to be displayed also changes.

  In the above embodiment, the map data storage device 90 is provided in the mobile phone 2, but the mobile phone 2 may acquire map data from an external device through a network.

1 On-vehicle device 2 Mobile phone (specific display device)
5 vehicle position communication system 10 control circuit 20 navigation device 30 GPS receiver 40 input device 50 communication module 51 antenna 60 control circuit 70 display 80 communication module 81 antenna 90 map data storage device (map data storage means)
100 input device 200 base station S11 display device designation step S12, S13, S21 to S23 first determination step S15, S16, S25, S26, S55, S56 scale acquisition step S17, S39 transmission interval determination step S32 present location detection step, present location detection Means S33 Destination acquisition step S34 Estimated time acquisition step S31, S35, S36, S37 Transmission step, transmission means S52 Map data acquisition step, map data acquisition means S53 Display step, display means S40 Arrival determination step S57, S58 Notification step S61 Vehicle Designation step S62, S63, S71 to S73 Second determination step

Claims (11)

A current position detection step for sequentially detecting the current position of the specific vehicle;
A transmission step of sequentially transmitting the current location detected in the current location detection step to a specific display device;
From the map data storage means for storing the map data, the map data acquisition step for acquiring the map data including the current location transmitted in the transmission step;
In the vehicle position communication method comprising: a display step of superimposing the current location transmitted in the transmission step on the map data acquired in the map data acquisition step and sequentially displaying the map on the specific display device.
In the transmission step, the current location is specified at a transmission interval in which the current display position and the previous display position in the map data of the current location displayed in the display step when the specific vehicle is moving can be distinguished. A vehicle position communication method comprising the step of transmitting to a display device. A scale acquisition step of acquiring a scale of the map data;
The vehicle position communication method according to claim 1, further comprising: a transmission interval determination step that determines the transmission interval based on the scale acquired in the scale acquisition step. A display device designating step of designating one or a plurality of display devices from a plurality of display devices based on an input operation of a user of the specific vehicle;
The vehicle position communication method according to claim 1, wherein the specific display device is a display device designated in the display device designation step. First determination step of determining whether or not the user of the specific display device desires that the current location of the specific vehicle is displayed on the specific display device based on an input operation of the user of the specific display device With
The vehicle position communication method according to any one of claims 1 to 3, wherein the transmission step does not transmit the current location when it is determined that the first determination step does not desire. . A vehicle designating step of designating one or a plurality of vehicles from a plurality of vehicles based on a user input operation of the specific display device;
The vehicle position communication method according to claim 1, wherein the specific vehicle is a vehicle specified in the vehicle specifying step. A second determination step of determining whether or not the user of the specific vehicle desires to display the current location of the specific vehicle on the specific display device based on an input operation of the user of the specific vehicle; ,
The vehicle position communication method according to any one of claims 1 to 5, wherein the transmission step does not transmit the current location when it is determined that the second determination step does not desire. . A destination acquisition step of acquiring a destination of the specific vehicle;
In the transmission step, the destination acquired in the destination acquisition step is also transmitted to the specific display device,
The vehicle position communication according to any one of claims 1 to 6, wherein, in the display step, the destination transmitted in the transmission step is also superimposed on the map data and displayed on the specific display device. Method. The map data storage means stores a plurality of map data having different scales,
The map data acquisition step acquires map data having the largest scale from the map data storage means among the map data that can display both the current location and the destination in the display step. The vehicle position communication method according to claim 1. An arrival determination step for determining whether or not the specific vehicle has arrived at the destination;
9. A notification step of notifying a user of the specific display device that the vehicle has arrived at the specific vehicle destination based on the determination that the vehicle has arrived at the arrival determination step. The vehicle position communication method according to any one of the above. An estimated time acquisition step of acquiring an estimated arrival time at which the specific vehicle arrives at the destination;
In the transmission step, the estimated arrival time acquired in the estimated time acquisition step is also transmitted to the specific display device,
The vehicle position communication method according to claim 1, wherein in the display step, the estimated arrival time transmitted in the transmission step is also displayed on the specific display device. A vehicle position communication system comprising an in-vehicle device provided in a specific vehicle and a specific display device,
The in-vehicle device is
Current location detection means for sequentially detecting the current location of the specific vehicle;
Transmission means for sequentially transmitting the current location detected by the current location detection means to the specific display device;
The specific display device is:
Map data acquisition means for acquiring map data including the current location transmitted by the transmission means from map data storage means for storing map data;
Display means for displaying the current location transmitted by the transmitting means superimposed on the map data acquired by the map data acquiring means;
The transmission unit of the vehicle-mounted device has a transmission interval in which the current display position and the previous display position in the map data of the current location displayed by the display unit when the specific vehicle is moving can be distinguished, A vehicle position communication system characterized by transmitting a current location to the specific display device.

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