JPH0512644B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention displays a road map of the area in which the vehicle is traveling, and additionally displays the current position of the vehicle within the area on the road map. The present invention relates to a vehicle navigation device.

[Conventional technology]

Conventionally, this type of device has been equipped with a direction detecting means for detecting the traveling direction of the vehicle, a traveling distance detecting means for detecting the distance traveled by the vehicle, and a cassette tape storing data on various driving areas. The road map of a specific driving area is displayed on a cathode ray tube (hereinafter referred to as CRT) using the map data read from the tape, and the current position calculated based on the signals from the direction detecting means and the traveling distance detecting means is displayed on the road map of the CRT. There are additional items to be displayed above.

[Problem to be solved by the invention]

However, this system only allows you to know the current position of your own vehicle within the driving area, and it is useful if you leave somewhere with another vehicle and then lose sight of the other vehicle. teeth,
The above device was unable to detect the presence of other vehicles.

The present invention has been made in view of the above-mentioned problems, and includes mounting the vehicle navigation device according to the present invention on each of the own vehicle and another vehicle, and obtaining information on each other's current position using the transmitting means and receiving means of each vehicle. The purpose of this is to enable each other to display the current location of other vehicles together with the current location of their own vehicle.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes a current position detection means for detecting the current position of a vehicle, a storage means for storing road map information, an electronic display means for electronically displaying a map, and a map from the storage means. Reading the information and displaying a road map of a predetermined driving area on the electronic display means,
A navigation device for a vehicle is provided with a control means for additionally displaying the current position detected by the current position detection means on the road map, and the navigation device for a vehicle is ) and another vehicle (hereinafter referred to as other vehicle) that communicates with the own vehicle, and the vehicle navigation device includes: (a) the current position detecting means; (b) a receiving means for receiving information indicating the current position of the other vehicle transmitted from the transmitting means of the other vehicle; (c) means for displaying the current position of the other vehicle on the road map of the electronic display means together with the current position of the own vehicle based on the information indicating the current position of the other vehicle received by the receiving means. It is characterized by

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is an overall configuration diagram showing one embodiment. In this Fig. 1, 1 is a direction detection device;
Equipped with an azimuth sensor that detects the X and Y components of the geomagnetic field according to the direction in which the vehicle is traveling, and an A/D converter that converts the signal from this azimuth sensor into a digital signal. It generates component digital signals. Reference numeral 2 denotes a distance sensor that generates a distance pulse every unit traveling distance of the vehicle (for example, approximately 39.2 cm). Reference numeral 3 denotes a reading device which searches for and reads the map data of a specific district using a set of cassette tapes 3a which store map data of a plurality of districts (including absolute coordinate data of the upper right point of each map). It is something.

4 is a microcomputer that executes software digital arithmetic processing according to a predetermined control program, and includes a CPU 4a, ROM 4b, and RAM.
4c and an I/O circuit section 4d, and is activated by receiving a stabilized voltage from a stabilized power supply circuit (not shown) that generates a stabilized voltage of 5V by receiving power from an on-board battery. , X and Y component digital signals from the direction detection device 1, distance sensor 2
The system performs arithmetic processing in response to distance pulses from the vehicle, reading signals from the reading device 3, etc., and generates display signals for displaying road maps and driving route information of a specific area. In addition, RAM4c
Power is constantly backed up from the car's battery.

5 is a CRT controller that receives display signals from the microcomputer 4 and individually stores map data, driving route information, and character data of a specific area, and also stores the stored map data, driving route information, or character data. It generates video signals and synchronization signals for displaying character data on a CRT. 6 as a display means
This is a CRT display device that displays a map and driving route of a specific area on the CRT using video signals and synchronization signals from the CRT controller 5. Reference numeral 7 denotes a touch panel section, which is attached to the display surface of the CRT display device 6 and generates a serial signal in response to a touch operation on a specific touch area among the 12 divided touch areas provided on this touch panel. be.

Reference numeral 8 denotes a transmitting device as a transmitting means for transmitting information indicating the current position of the vehicle (a map number described later and X, Y coordinate data with respect to a map of the driving area) to other vehicles. A device that inputs data shown in the vehicle, converts it into a transmission signal based on that data, modulates it to a transmission frequency unique to this vehicle, and then transmits the information to other vehicles from an antenna installed on the vehicle. It is. Reference numeral 9 denotes a receiving device as a receiving means for receiving information indicating the current position of another vehicle (map number and X, Y coordinate data), and receives a signal of a specified frequency from the microcomputer 4 (signal transmitted from the specified other vehicle). ) from an antenna installed in the vehicle, demodulates it, converts it into a digital signal, and outputs it to the microcomputer 4. 10 is the keyboard, the second
As shown in the figure, there are numeric keys from 0 to 9 and a decimal point key (each with a return type) for specifying a frequency unique to another vehicle, and the transmitting device that generates a signal to start transmission and reception when turned on. 8. A holding type communication mode key for supplying power to the receiving device 9, a return type clear (CL) key for clearing the frequency value operated by the key, and a key for registering and inputting the frequency value operated by the key. It is equipped with a retentive entry (ENT) key.

Next, the CRT controller 5 shown in FIG.
The detailed electrical wiring diagram will be explained. 11 is
Oscillation circuit that generates a 12.096MHz oscillation signal, 12
divides the oscillation signal from oscillation circuit 11 to 6.048M
A dot counter 13 generates a dot timing clock of Hz and a character timing clock of 756KHz.A dot counter 13 generates horizontal and vertical synchronizing signals and reflex signals by commands from the microcomputer 4 and the character timing clock from the dot counter 12. a display controller that generates a digital memory address signal and a raster address signal; 14;
is controlled by the microcomputer 4 during the display period based on the horizontal and vertical synchronization signals from the display controller 13.
This is a hold signal generation circuit that generates a hold signal to the hold (HOLD) terminal of the microcomputer 4 to hold the hold signal. 15 is a multiplexer that switches the address signal from the microcomputer 4, the refresh memory address signal from the display controller 13, and the raster address signal in response to a hold acknowledge (HOLDA) signal from the microcomputer 4;
7 and 18 are bus drivers with a tri-state that switches the direction of data between the microcomputer 4 and the display memory; 19 is a bus driver that stores display data such as ASCII codes from the microcomputer 4 and refreshes from the display controller 13; A character memory 20 receives a memory address signal and outputs its contents as an address, and a character generator 20 outputs a display pattern based on a display address from the character memory 19 and a raster address signal from the display controller 13. 21 is a first graphic memory that stores map data from the microcomputer 4; 22 is a second graphic memory that stores travel route information (travel trajectory data, current position data) from the microcomputer 4; 23; 2
4, 25 are character generators 20, first;
A parallel to serial (P to S) converter converts the parallel signals from the second graphic memories 21 and 22 into serial data using the dot timing clock from the dot counter 12; 26 is a screen switching signal from the microcomputer 4; To select the graphics and character screen, press P →
A video controller that switches reception of signals from the S converter 23 and the P→S converters 24 and 25 and generates a video signal according to the display timing signal from the display controller 13; 27 is synchronized by horizontal and vertical synchronization signals from the display controller 13 This is an exclusive OR circuit that generates a signal. The character memory 19 and the first and second graphic memories 21 and 22 are constantly backed up with power from the vehicle battery.

That is, this CRT controller 5 stores character data in the character memory 19 based on the data sent from the microcomputer 4.
Then, the map data is stored in the first graphic memory 21.
The display data of the travel trajectory and current position is always stored in the second graphic memory 22, and the graphic screen (displaying the travel trajectory and current position on the map) is switched on and off by a screen switching signal from the microcomputer 4. A character screen (on which designated characters, etc. are displayed to designate a district) is selected, and a video signal and a synchronization signal are generated on the CRT display device 6 to display a screen corresponding to the selection on the CRT.

The touch panel section 7 has 12 touch areas 31 to 42, as shown in FIG. configured,
When a specific touch area is pressed, the touch area is detected by the contact of the transparent conductive film of the matrix due to the bending of the glass, and a serial signal (start signal) corresponding to the touch area detected by a touch signal generation circuit (not shown) is detected. and touch information signals). Note that this touch signal generation circuit generates the touch information at that time in the form of a serial signal every 40 msec.

Furthermore, FIG. 5 shows a data area corresponding to one district on the cassette tape 3a, and A stores the absolute coordinate data (coordinates with respect to the North Pole) of the upper right point of the map of that district and the map number. B is a map data storage section storing map data of the area, and X is a blank section. Therefore, by reading parts A and B with the reading device 3, it is possible to provide the microcomputer 4 with map data, a map number, and absolute coordinate data of a specific area.

The operation of the above configuration will be explained with reference to the display explanatory diagram in FIG. 6 and the calculation flowcharts shown in FIGS. 7 to 11. FIG. 7 is a calculation flowchart showing the overall calculation processing of the main routine of the microcomputer 4, FIG. 8 is a calculation flowchart showing the calculation processing of the interrupt calculation routine based on the distance pulse from the distance sensor 2, and FIG. Calculation flowchart showing detailed calculation processing of the mode calculation routine in Fig. 7, No. 10
7 is a calculation flowchart showing detailed calculation processing of the current position calculation routine in FIG. 7, and FIG. 11 is a flowchart showing detailed calculation processing of the communication mode calculation routine in FIG.

Now, in a vehicle equipped with components 1 to 10 shown in FIG. 1, when a key switch is turned on at the start of operation, each part of the electrical system is activated by receiving power from the vehicle battery. The microcomputer 4 then receives a stabilized voltage of 5V from the stabilized power supply circuit and enters the operating state, starts its calculation processing at start step 100 in FIG. 7, and proceeds to the initial setting routine 200. Registers, counters, latches, etc. in the microcomputer 4 are set to initial states necessary for starting arithmetic processing. After this initial setting, the communication mode calculation routine 600 is repeatedly executed from the mode calculation routine 300 at a predetermined cycle.

That is, in this mode calculation routine 300, one of the map mode and character mode is selected, and the content corresponding to that mode is selected.
A CRT is displayed, and when in the map mode, a cursor indicating the current position can be moved, and when in the character mode, calculation processing is executed to enable designation of a specific area on the map, and the process proceeds to the current position calculation routine 400. In this current position calculation routine 400, the CRT
A calculation process is executed to change the contents of the current position data and travel trajectory data in the second graphic memory 22 in the controller 5 with a travel change of ±50 m for each X and Y component, and the communication mode calculation routine 600 is executed. move on. In this communication mode calculation routine 600, the current positions of the own vehicle and the other vehicle are transmitted and received, and calculation processing for displaying the current position of the other vehicle on the CRT display device 6 is executed, and the process returns to the mode calculation routine 300. Thereafter, the main routine arithmetic processing from the mode arithmetic routine 300 to the communication mode arithmetic routine 600 is repeatedly executed at a cycle of approximately several tens of milliseconds.

When a distance pulse from the distance sensor 2 is applied to the interrupt (INT) terminal of the microcomputer 4 in response to the repeated calculations of this main routine, the microcomputer 4 temporarily suspends the calculation processing of the main routine. The interrupt calculation process shown in FIG. 8 is executed. That is, the interrupt start step
The calculation process starts from 501, and the integration step 502
Proceed to the distance data D stored in RAM4C.
unit distance data (equivalent to about 39.2 cm) is integrated and updated, and the process proceeds to distance determination step 503, where it is determined whether the distance data D has reached 6.25 m. At this time, if the distance data D has not reached 6.25 m, the determination will be NO and the process will proceed to return step 510, but if the distance data D has reached 6.25 m, the determination will be NO.
The answer is YES, and the process advances to direction signal input step 504.
Then, in this azimuth signal input step 504, digital X and Y component signals from the azimuth detection device 1 are input.
Input Xa, Ya (positive directions for east and north, negative directions for west and south), proceed to step 505 to calculate average direction, and use the previous direction data Xo, Yo (direction data before traveling 6.25 m) and the current direction. Calculate the average orientation data X and Y from the orientation data Xa and Ya, and perform the distance component calculation step.
Proceed to 506 and set the distance component Dx in the X direction to 6.25X/√ ²
+Y ² , the distance component Dy in the Y direction is 6.25Y/√ ² + ^{2
Calculated as _ _}
corresponds to sinθ), the process proceeds to storage step 507, where the current azimuth data Xa and Ya are memorized as Xo and Yo for the next time, and the process proceeds to distance data reset step 508, where the distance data D is reset to 0 and the distance flag is The program proceeds to set step 509 to set the distance flag, and then proceeds to return step 510 to return to the previously interrupted main routine. That is, in this interrupt calculation routine, the distance data D is cumulatively updated every time a unit distance is traveled, and the distance data D is 6.25 m.
When the distance reaches 6.25 m, the distance components Dx and Dy in the X and Y directions for this 6.25 m are calculated, and arithmetic processing is executed to set a distance flag.

Next, detailed calculation processing of the mode calculation routine 300 in the main routine will be explained. In this mode calculation routine 300, the calculation process is started from the touch data input step 301 in FIG. 9, and touch data from the touch panel section 7 is input and stored in the RAM 4C. Then, the process proceeds to map mode determination step 302, where it is determined whether the contents of the mode area in the RAM 4C are map mode, and when it is map mode, the determination is YES.
, proceed to mode change determination step 303.
It is determined whether the touch area stored in the RAM 4C is data indicating a mode change (data when touch area 34 in FIG. 4 is pressed). At this time, if the touch data is data indicating a mode change, the determination becomes YES, and the process proceeds to character mode setting step 304, where the contents of the mode area are set to character mode.
Proceed to character switching signal output step 305.
A character switching signal for displaying a character screen on the CRT display device 6 is generated to the video controller 26 in the CRT controller 5, and one calculation process of this mode calculation routine 300 is completed.

On the other hand, when the touch data is not data indicating a mode change, that is, data when a touch area other than 34 in Fig. 4 is pressed, or data when no touch area is pressed (for example, data FF). Sometimes, the determination in the mode change determination step 303 becomes NO, and the process proceeds to the cursor movement determination step 306. In this cursor movement determination step 306, the touch data is
It is determined whether the data (cursor movement data) is when any of the touch areas 2, 33, 35, 3840, or 41 is pressed, and if the touch data is not cursor movement data, the judgment is NO.
One calculation process of this mode calculation routine 300 is completed, but if the touch data is cursor movement data, the determination becomes YES.
The process advances to cursor movement calculation step 307. In this cursor movement calculation step 307, depending on the touch data, this touch data is 32 or 33.
The data for pressing the touch area is
The cursor at the current position displayed on the CRT display device 6 is moved north by a predetermined distance.
The content of the second graphic memory 22 in the CRT controller 5 is changed, and if the touch data is data for pressing the touch area 35, the cursor is moved westward and the touch data is 4.
The second graphic memory is configured to move the cursor southward by a predetermined distance if the data corresponds to the press of touch area 0 or 41, and to move the cursor eastward by a predetermined distance if the touch data corresponds to the press of touch area 38. 22 is executed, and one calculation process of this mode calculation routine 300 is completed.

On the other hand, if the determination in the map mode determination step 302 is NO, the process advances to a mode change determination step 308.
It is determined whether or not the mode is to be changed using the same calculation process as in the mode change determination step 303. At this time,
If the determination is YES when changing the mode, the process proceeds to map mode setting step 309, sets the contents of the mode area C in RAM4 to map mode, and proceeds to data conversion step 310, where the CRT controller 5
The travel route data in the second graphic memory 22 is converted. In this case, first, the reading device 3 is controlled to search for a specified area using the map number, and the absolute coordinate data (stored in the header section A shown in Fig. 5) of the searched map and the absolute coordinate conversion value of the previous map are used. is calculated, and the travel locus and current position data (X, Y coordinate data) in the second graphic memory 22 are converted so as to slide according to the calculated values. Then, the process proceeds to map data reading and outputting step 311, where the map data of the cassette tape 3a is inputted via the reading device 3, and the map data is outputted to the first graphics memory 21, and a map switching signal outputting step is performed.
The process proceeds to step 312, where a map switching signal for displaying a map graphic screen on the CRT display device 6 is generated to the video controller 26, and one calculation process of this mode calculation routine 300 is completed. That is, when switching from the character screen to the graphic screen of a map different from the previous one, the above calculation process is executed, the current map data is stored in the first graphic memory 21, and the vehicle moves to the current position corresponding to this map. The contents in the second graphics memory 22 are transformed to modify the trajectory and the cursor indicating the current location. Due to this,
Even when the map displayed on the CRT display device 6 is switched, the travel trajectory and current location can be displayed in the area corresponding to the map. Note that the X, Y coordinate data indicating the current position is always stored in the RAM 4C.

On the other hand, if the determination in the mode change determination step 308 is NO, the process advances to a character calculation step 313.
When the character calculation step 313 is reached, the character mode has been set and a character switching signal has been issued to the video controller 26, so the CRT display device 6 can display the character as shown in FIG. The screen is being imaged. The numbers 0-2 shown in the center of this character screen
-4-68 are numbers specifying regions, regions, and districts, that is, map numbers, and each number is updated by incrementing by 1 with the increment switch 51, subtracting by 1 with the decrement switch 52, and updated with the setting switch 53. is set at
The character calculation step 313 performs arithmetic processing so that the reset switch 54 resets the character.
Please note that the numerical data for this region, region, and district is
Stored in RAM4C. Further, the switches 51, 52, 53, and 54 mentioned above correspond to the touch areas 39, 40, 41, and 42 in FIG. 4, respectively.

That is, in the mode subtraction routine 300 shown in FIG. 9, the following operations are performed according to the touch data from the touch panel section 7 and the contents of the mode area in the RAM 4C.

If there is an instruction to move the cursor when the map mode is in the map mode and the mode is not changed, arithmetic processing for moving the cursor is executed, and if there is no instruction to move the cursor, the map display is continued as it is.

If there is an instruction to change the mode while in the map mode, the map mode is changed to the character mode and the character screen is displayed on the CRT display device 6.

When the character mode is in effect and the mode is not changed, map changes can be accepted on the character screen as shown in FIG.

When a mode change instruction is given while in the character mode, the character mode is changed to the map mode, a graphic screen of the map is displayed on the CRT display device 6, and at the same time, the travel trajectory and current position are corrected and displayed.

Next, detailed calculation processing of the current position calculation routine 400 in the main routine will be explained.
In this current position calculation routine 400, the calculation process starts at distance flag determination step 401 in FIG. 10, and it is determined in the interrupt calculation process in FIG. 8 whether or not the distance flag is set. At this time,
If the distance flag is not set, the judgment will be
If the result is NO, one calculation process of the current position calculation routine 400 is completed, but if the distance flag is set, the determination becomes YES and the process proceeds to the X distance correction step 402. Then, in this X distance correction step 402, the X distance data DX is corrected by the X distance component Dx obtained by the interrupt calculation process (DX=DX+Dx), and in the Y distance correction step 403, the Y distance data DY is calculated. Similarly, the correction calculation (DY=DY
+Dy) and proceeds to the first X-distance determination step 404, where it is determined whether the X-distance data DX has reached a value of 50 m or more. At this time, the X distance data DX is 50
If the width is more than m, the judgment will be YES, and X
Proceed to distance subtraction step 405 and X distance data DX
The value of 50 m is subtracted from the current position, and the process proceeds to display movement step 406, where the current position data in the second graphic memory 22 is moved in the positive direction (eastward) by 50 m, and the traveling locus data also follows this. let Note that when changing the current position data, the X coordinate data in the RAM 4C is also changed.

If the determination in the first X distance determination step 404 is NO, the process proceeds to a second X distance determination step 407, in which it is determined whether the X distance data DX has reached a value of -50 m or less. At this time, the X distance data
If DX is a value of -50m or less, the determination becomes YES, and the process proceeds to X distance addition step 408, where the value of 50m is added to the X distance data DX, and the display movement step is performed.
Proceeding to step 409, the current position data in the second graphic memory 22 is moved in the negative direction (westward) by 50 m, and the traveling locus data is also caused to follow this movement. Note that when changing the current position, the X coordinate data in the RAM 4C is also changed.

Then, when the judgment in the second X distance judgment step 407 is NO, or in the display movement step 406,
After step 409, the routine advances to Y component display movement processing routine 410, where the same determination and calculation processes as in steps 404 to 409 are executed on the Y distance data DY calculated in Y distance correction step 403. (Y distance data
When DY reaches a value of 50 m or more in either the positive or negative direction, the current position data and traveling trajectory data in the second graphic memory 22 are moved by 50 m in the corresponding direction. ) Note that when changing the current position data, the Y coordinate data is also changed.

Then, the process advances to step 411 to reset the distance flag.

That is, in the front damage position calculation routine 400 shown in FIG. 10, the current position data and traveling trajectory data in the second graphic memory 22 are changed regardless of the screen displayed on the CRT display device 6. In addition, the RAM
Also change the X and Y coordinate data in 4C.

Therefore, the current position data and traveling trajectory data in the second graphics memory 22 are sequentially changed by the calculation processing by the mode calculation routine 300, the current position calculation routine 400, and the interrupt calculation processing shown in FIG. At the same time, select the screen of the CRT display device 6 according to the specified mode, display the map's graphic memory screen (including display of the current position and travel trajectory) in the map mode, and select the character mode. If so, the character screen for map designation shown in FIG. 6 is displayed.

Next, the calculation processing of the communication mode calculation routine 600 in the main routine will be explained. First, when the communication mode calculation routine 600 in FIG. 11 is reached, it is determined in a communication mode determination step 601 whether or not a signal is generated by pressing the communication mode key from the keyboard 10, and if the signal is not generated. Sometimes, the judgment becomes NO and one calculation process of this communication mode calculation routine 600 is completed without performing the following calculation process, but when the above-mentioned signal is generated, the judgment becomes YES and the frequency data input step is started. 602 forward. It should be noted that when the communication mode key is turned on and held, power is supplied to the transmitting device 8 and the receiving device 9, and the transmitting device 8 and the receiving device 9 are activated. This frequency data input step
At step 602, arithmetic processing is performed to monitor the frequency value unique to the other vehicle operated by keys on the keyboard 10 every time this step 602 is reached, and to sequentially input and store the values of each digit. Then, the next CL key judgment step
At 603, it is determined whether or not a signal is generated when the CL key is operated from the keyboard 10, and if the CL key is operated due to the frequency being input by mistake, the determination becomes YES; Proceed to clear step 60 to clear all frequency data stored up to that point. On the other hand, if the judgment in the CL key judgment step 603 is NO, the process advances to the next ENT key judgment step 605, and the key is pressed from the keyboard 10.
It is determined whether or not a signal is generated when the ENT key is operated, and the determination becomes NO while the ENT key is not operated, but in order to register the frequency data that has been input by the ENT key, the ENT key is pressed. When the key is inserted and held, the judgment becomes YES. and,
Proceeding to frequency data output step 606, the registered frequency data is output to the receiving device 9 and held there, and the process proceeds to own vehicle position data output step 607, where data indicating the own vehicle position, that is, the map number and current position is output. The X and Y coordinate data are output to the transmitting device 8, and the process proceeds to another vehicle position data input step 608, where information from the other vehicle received by the receiving device 9 (based on a signal tuned to the specified frequency) is input. . This input information is not valid data,
In other words, if information indicating the current location has not yet been sent from another vehicle, the determination will be NO, but if the data is valid, the determination will be YES. Then, the process proceeds to the next map number determination step 610, where the map number based on the information sent from the other vehicle and the map number of the map displayed on the own vehicle are compared, and if the vehicle is in the same driving area and the map number is the same. If the map with the map number is displayed, the judgment will be YES,
Proceed to step 611 to display the position of another vehicle. In the other vehicle position display step 611, the X and Y of the other vehicle input previously are
Based on the coordinate data, move the CRT so that the point is displayed on the CRT display device 6 with an x mark (see Figure 1).
Display data is written into the second graphics memory 22 in the controller 5. Note that if the position of the other vehicle moves during the writing, the previous display data is erased and new display data is written.

Therefore, by repeatedly executing the calculation process of this communication mode calculation routine 600, the current position information of the own vehicle can be transmitted to other cars, and
Receive current location information of other vehicles and determine the current location of other vehicles
Display it on the CRT display device 6 with an x mark.

In addition, in the above embodiment, information on the current position is transmitted and received as a map number and X, Y coordinate data, but the current position is converted into absolute coordinate data for a specific point such as the North Pole, and then transmitted and received,
When displayed, the coordinates may be converted into coordinates within the map and displayed.

Also, although we have shown a case in which the other vehicle is not displayed when no other vehicle is in the same driving area, it may also be possible to display the other vehicle's position at a position at the edge of the screen that indicates the direction of the other vehicle. . Further, the position of the other vehicle does not need to be marked with an x mark, but may be marked with another symbol.

Furthermore, although the direction of movement of the vehicle is detected using the azimuth detection device 1 for detecting geomagnetism, it may be of a gyroscope type that relatively detects the direction of movement of the vehicle.

Furthermore, although the control is performed by software using the microcomputer 4, a hard logic configuration using an electronic circuit may also be used.

Further, although a CRT is used as the display means, it is also possible to use a liquid crystal, an EL, or the like.

〔Effect of the invention〕

As described above, the present invention provides a device equipped with a display means for displaying a road map in a driving area together with the current position, and a transmitting means for transmitting information indicating the current position of the vehicle to other vehicles. , a receiving means for receiving information indicating the current position of another vehicle within the driving area, and a means for additionally displaying the current position of the other vehicle on the road map of the display means based on the information received by the receiving means. By installing this device in other cars, the transmitting means and the receiving means can transmit and receive information on each other's current positions, and each other can display the other cars' current positions together with their own car's current position. As a result, when you are leaving somewhere with another vehicle, even if you lose sight of the other vehicle, you can easily recognize the driving position of the other vehicle by using the display on your own vehicle. This has an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
Figure 2 is a configuration diagram of the keyboard in Figure 1, Figure 3 is a detailed electrical wiring diagram of the CRT controller in Figure 1, Figure 4 is an explanatory diagram showing the touch area of the touch panel, and Figure 5. is an explanatory diagram showing the data area of a cassette tape, and Figure 6 is an explanatory diagram showing the data area of a cassette tape.
Explanatory diagrams showing display states, FIGS. 7 to 11 are calculation flowcharts showing calculation processing of the microcomputer in FIG. 1. 1... Direction detection device, 2... Distance sensor, 3a
...cassette tape, 3...reading device, 4...microcomputer, 6...as display means
CRT display device, 8... a transmitting device as a transmitting means, 9... a receiving device as a receiving means.

Claims (1)

[Scope of Claims] 1. Current position detection means for detecting the current position of the vehicle, storage means for storing road map information, electronic display means for electronically displaying, and reading map information from the storage means. displaying a road map of a predetermined driving area on the electronic display means;
A navigation device for a vehicle is provided with a control means for additionally displaying the current position detected by the current position detection means on the road map, and the navigation device for a vehicle is ) and another vehicle (hereinafter referred to as other vehicle) that communicates with the own vehicle, and the vehicle navigation device includes: (a) the current position detecting means; (b) a receiving means for receiving information indicating the current position of the other vehicle transmitted from the transmitting means of the other vehicle; (c) means for displaying the current position of the other vehicle on the road map of the electronic display means together with the current position of the own vehicle based on the information indicating the current position of the other vehicle received by the receiving means. A vehicle navigation device characterized by: