JPH0116369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-vehicle navigator that displays the current position of a vehicle on a road map display surface.

[Conventional technology]

Conventionally, as a device of this kind, there is a "vehicle travel position display device" disclosed in Japanese Patent Application Laid-Open No. 55-159299, which includes a distance sensor for detecting the travel distance of the vehicle and a direction sensor for detecting the traveling direction of the vehicle. The driving position of the vehicle is displayed on the road map display surface of the display.

[Problem that the invention seeks to solve]

However, the road map display in this device is currently done using a transparent film printed with the road map of the driving area, so when the driving position reaches the edge of the road map, it is necessary to switch to an adjacent map. Due to this switching, the road map display on the display screen changes significantly, and there is a problem in that it is difficult to understand the connection with the previous road map.

The present invention has been developed in view of the above problem, and when a road map of a specific area is displayed on a display screen such as a CRT, when updating the display from this specific area to an adjacent area, The purpose is to clearly display the connection between the district and the newly displayed adjacent district.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a current position detection means for detecting the current position of the vehicle, and a current position detected by the current position detection means on the display surface of a road map, as shown in FIG. In an in-vehicle navigator equipped with a display means for displaying, a memory storing map data for displaying a road map of a particular district on the display means and map data for road maps of a plurality of districts adjacent to the particular district. means for determining whether or not the current position displayed on the display means belongs to a display switching area on the display surface; and when the determination by the determination means is affirmative, the specific area currently displayed; From among multiple districts adjacent to
an adjacent district selection means for selecting an adjacent district for display shifting based on the current position; and reading map data of the adjacent district selected by the adjacent district selection means from the storage means, and reading the read map data. and map data creation means for creating adjacent composite map data for moving the boundary between the adjacent district and the specific district toward the center of the display surface based on the map data of the specific district; and this map data Based on the adjacent composite map created by the creation means, the currently displayed map of only the specific district is shifted and displayed to a composite map in which the boundary portion is closer to the center of the display surface, and this shift is performed. The present invention is characterized by comprising: display control means for moving the current position display to a corresponding position on the composite map display as the current position display is displayed.

〔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 Fig. 1, reference numeral 1 denotes a direction detection device as direction detection means, which includes a direction sensor that detects the X and Y components of the earth's magnetism according to the direction in which the vehicle is traveling, and converts the signal from this direction sensor into a digital signal. It is equipped with an A/D converter and generates digital signals of X and Y components depending on the traveling direction of the vehicle. Reference numeral 2 denotes a distance sensor as a distance detecting means, which generates a distance pulse every unit traveling distance of the vehicle (for example, about 39.2 cm). Reference numeral 3 denotes a reading device, and a cassette tape 3a serves as a storage means for storing map data of a plurality of districts (including absolute coordinate data for the reference point of the upper right point of each map).
The map data for a specific area is searched and read based on the set of information.

4 is a microcomputer that executes software digital arithmetic processing according to a predetermined control program, and includes a CPU 4a, a ROM 4b, and a 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 upon receiving distance pulses from the vehicle, reading signals from the reading device 3, etc., and generates display signals for displaying a map of a specific area, travel route information, and the like. Note that the RAM 4c is constantly backed up with power from the on-board battery.

5 is a cathode ray tube (CRT) controller,
In response to a display signal from the microcomputer 4, map data, driving route information, and character data of a specific area are individually stored, and the stored map data, driving route information, or character data is displayed on a CRT. It generates video signals and synchronization signals for Reference numeral 6 denotes a CRT display device as a display means, which displays a map of a specific area, a driving route, or a character using the video signal and synchronization signal from the CRT controller 5.
It is to be displayed. 7 is the touch panel section,
It is mounted on 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 the touch panel. A map update switch 8 is provided near the CRT display device 6 and provides the microcomputer 4 with map update timing. Then, a reading device 3, a microcomputer 4,
The CRT controller 5 constitutes a control means.

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 horizontal and vertical synchronization signal and a display timing signal are generated by commands from the microcomputer 4 and a character timing lock from the dot counter 12. , a display controller that generates a refresh memory address signal and a raster address signal, and 14 a hold signal that causes the microcomputer 4 to hold 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 is generated at the (HOLD) terminal. 16 is a multiplexer which 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; 16, 17, and 18 A bus driver 19 having a tri-state that switches the direction of data between the microcomputer 4 and the display memory stores display data such as ASCII codes from the microcomputer 4 and receives a refresh memory address signal from the display controller 13. A character memory 20 outputs the 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; 24 and 25 are parallel to serial (P to S) converters that convert parallel signals from the character generator 20 and the first and second graphic memories 21 and 22 into serial data using the dot timing clock from the dot counter 12.
A converter 26 switches reception of signals from the P→S converter 23 and P→S converters 24 and 25 in order to select between graphic and character screens in response to a screen switching signal from the microcomputer 4. A video controller 27 generates a video signal using a display timing signal, and 27 is an exclusive OR circuit that generates a synchronization signal using horizontal and vertical synchronization signals from the display controller 13. Note that the character memory 19, the first
The second graphic memories 21 and 22 are constantly backed up with power from an on-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 constantly stored in the second graphic memory 22, and the graphic screen (displaying the travel trajectory and current location on the map) and characters are displayed by a screen switching signal from the microcomputer 4. The CRT display device 6 generates a video signal and a synchronization signal for selecting a screen (displaying designated characters, etc. to designate a district) and displaying a screen corresponding to the selection on the CRT.

The touch panel section 7 has touch areas divided into 12 sections, numbered 31 to 42, as shown in FIG. 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 deflection of the glass, and a serial signal corresponding to the touch area detected by a touch signal generation circuit (not shown) is generated. (consisting of a start signal and a touch information signal). 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. 4 shows the detailed configuration of the reading device 3. 51 is a magnetic head that reads data etc. from the cassette tape 3a, 52 is an amplifier circuit that amplifies the signal read by the magnetic head 51, and 53 is a signal converter that converts the signal after passing through the amplifier circuit 52 into a digital signal. 54 is an interface circuit with the microcomputer 4, 55 is a control circuit that controls the motor 56 in accordance with a control signal received from the microcomputer 4 through the interface circuit 54, and 56 is a motor. The reading device 3 having the above configuration is configured to drive the motor 56 by a signal sent from the microcomputer 4.
from the cassette tape 3a to the magnetic head 5.
1 reads map information and map data, and sends the data to the microcomputer 4 through the interface circuit 54.

In addition, FIG. 5 shows 1 in the cassette tape 3a.
61 and 69 are non-green areas, 63 is a map number area that stores the map number of this area, and 64 and 6 are data areas corresponding to one district.
5 is a map horizontal displacement area and a map vertical displacement area, 66, which store the absolute coordinates of the upper right point of the map of this area as horizontal displacement (X direction) and vertical displacement (Y direction) data.
is an adjacent map number area that stores map numbers of eight adjacent districts. And this 63~
A map information area is composed of an area 66, and a header 62 and an ender 67 enable data in this map information area to be distinguished from data in other areas. Also, 68 is a road map of this area (1
This is a map data area that stores map data for displaying the entire screen. The reading device 3 reads the respective data of the map data area 68 and the map information area, thereby providing the microcomputer 4 with data such as map data, absolute coordinates, and adjacent map numbers of the area.

Note that the map data is created so that there is no overlap with the map data of the road map of the adjacent district.

The operation of the above configuration will be explained with reference to the display explanatory diagram in FIG. 6, the calculation flowcharts shown in FIGS. 7 to 10, the district display explanatory diagram in FIG. 11, and the map number explanatory diagram in FIG. 12. 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. is a calculation flowchart showing detailed calculation processing of the mode calculation routine in FIG. 7, and FIG. 10 is a calculation flowchart showing detailed calculation processing of the current position calculation routine in FIG.

Now, in a vehicle equipped with components 1 to 8 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 an on-vehicle battery. Then, the microcomputer 4 receives the stabilized voltage of 5V from the stabilized power supply circuit and enters the operating state, starts its calculation processing from the start step 100 in FIG. 7, and proceeds to the initial setting routine 200. The registers and counters in the microcomputer 4,
Sets latches, etc. to the initial state necessary to start arithmetic processing. After this initial setting, the mode calculation routine 300 and the current position calculation routine 400 are repeatedly executed at a cycle of approximately several tens of milliseconds.

That is, in this mode calculation routine 300,
Select either map mode or character mode and select the content according to that mode.
A CRT display is performed, and when in map mode, a cursor indicating the current position can be moved, and when in character mode, calculation processing is executed to enable map designation of a specific area, and the process proceeds to current position calculation routine 400.
In this current position calculation routine 400, the current position data and traveling trajectory data in the second graphic memory 22 in the CRT control 5 are
A calculation process is executed to change the content based on a travel change of ±50m for each component, and the mode calculation routine 300 is executed.
Return to Thereafter, the main routine arithmetic processing from the mode arithmetic routine 300 to the current position arithmetic routine 400 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
The process advances to step 503 to update the distance data D stored in RAM 4 by integrating unit distance data (equivalent to approximately 39.2 cm), and proceeds to distance determination step 503 to determine whether or not the distance data D has reached 6.25 m. judge. 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 Find the distance component Dy in the Y direction as 6.25Y/√ ² + ² (X/√ ² + ² is cosθ for the counterclockwise angle θ with the east direction as the reference, and Y/√ ² + ² is
(equivalent to sinθ), the process advances to storage step 507 to store the current azimuth data Xa and Ya as Xo and Yo for next time, and advances to distance data reset step 508 to reset the distance data D to 0 and set the distance flag. Proceed to step 509 to set the distance flag,
Proceeding to return step 510, the program returns to the main routine that was suspended earlier. That is, in this interrupt calculation routine, the distance data D is cumulatively updated every time a unit distance is traveled, and when the distance data D reaches 6.25 m, the distance components in the X and Y directions for this 6.25 m are updated.
Calculates Dx and Dy and executes arithmetic processing to set the 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 starts from the touch data input step 301 in FIG.
Input touch data from touch panel section 7
Store in RAM4C. Then, the process advances to map mode determination step 302, where it is determined whether the contents of the mode area in RAM4C are map mode, and when it is not map mode, the determination becomes NO, and the process advances to mode change determination step 311, where the RAM 4C is in map mode.
It is determined whether the touch data stored in 4C is data indicating a mode change (data when touch area 34 in FIG. 3 is pressed).
At this time, if the touch data is data indicating a mode change, the determination becomes YES, and the process proceeds to map mode setting step 312, sets the contents of the motor area in RAM4C to map mode, and proceeds to driving route data conversion step 390. Proceed to 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 district using its map number, and the absolute coordinates of the searched district on the map (map horizontal displacement area 64 and map vertical displacement area 65 shown in FIG. 5) are A coordinate conversion value is calculated using the absolute coordinate data on the previous map of the district (memory) and the data of the travel trajectory and current position in the second graphic memory 22 is converted in a sliding manner according to this calculated value. , the X and Y coordinate data of the current position in RAM4C are also converted. Then, the process proceeds to data reading step 391, where the adjacent map number data and map data of the cassette tape 3a are inputted via the reading device 3, the adjacent map number data is stored in the RAM 4C, and the map data is stored in the first graphic memory. Output to 21. Then, the process proceeds to step 392, where the composite map flag is reset, and the process proceeds to map switching signal output step 393, where a map switching signal for displaying the map graphic screen on the CRT display device 6 is generated to the video controller 26, and this mode is set. Arithmetic routine 300
One calculation process 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 driving trajectory is added to the current location corresponding to this map. and converting the contents in the second graphics memory 22 to modify the cursor indicating the current location. As a result, even if the map displayed on the CRT display device 6 is changed, the travel trajectory and current location can be displayed in the area corresponding to the map.

On the other hand, if the determination in the mode change determination step 311 is NO, the process advances to a character calculation step 310.
When the character calculation step 310 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 is in a character mode as shown in FIG. The screen is being imaged. The number 02-4 shown in the center of this character screen
-68 is a number that designates a locality, area, or district, and each number is updated by incrementing by 1 with the increment switch 81, subtracting by 1 with the decrement switch 82, and set and reset with the set switch 83. The character calculation step is reset by switch 84.
Arithmetic processing is performed at 316. Furthermore, this region, region,
District numerical data, i.e. map number, is stored in RAM
It is stored in 4C. Further, the switches 81, 82, 83, and 84 mentioned above correspond to the touch areas 39, 40, 41, and 42 in FIG. 3, respectively.

On the other hand, when the determination in the map mode determination step 302 is YES, the process proceeds to a mode change determination step 303, and a calculation process similar to that in the mode change determination step 311 is used to determine whether or not the mode is to be changed. At this time, if the judgment becomes YES when changing the mode,
Proceeding to character mode setting step 304, the contents of the mode area are set to character mode, and proceeding to character switching signal output step 305, a character switching signal is output to the CRT controller 5 to display the character screen on the CRT display device 6. occurs in the video controller 26 at
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. 3 is pressed, or data when no touch area is pressed (for example, data FF). Sometimes, the determination in the date 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 32,
Determine whether the data is the data (cursor movement data) when any of the touch areas 33, 35, 38, 40, or 41 is pressed, and if the touch data is not the cursor movement data, the judgment is NO. However, if the touch data is cursor movement data, the judgment becomes YES and the cursor movement calculation step is executed.
Proceed to 307. In this cursor movement calculation step 307, in accordance with the touch data, the cursor at the current position displayed on the CRT display device 6 is moved a predetermined distance northward, indicating that this touch data corresponds to the press of touch area 32 or 33. the second in CRT controller 5 to move only
Similarly, if the touch data corresponds to the pressing of touch area 35, move the cursor westward, and if the touch data corresponds to pressing touch area 40 or 41, move the cursor southward. In the direction, if the touch data corresponds to pressing the 38 touch areas, the second graphic memory 2 moves the cursor by a predetermined distance in the east direction.
2. Execute arithmetic processing to change the contents of 2. Note that the coordinates of the current position on the display screen by this cursor are stored in the RAM 4C as X and Y coordinate data for the upper right point of the map.

After this cursor movement calculation step 307, the process advances to a map update switch determination step 308.
In this map update switch determination step 308, it is determined whether or not there is an input from the map update switch 8 by turning it on.
If NO, one calculation process of mode calculation routine 300 is completed, but if there is an input and the judgment is
If YES, the process advances to map update determination step 309.
In this map update determination step 309, the current position is determined by the X and Y coordinate data of the current position stored in the RAM 4C in the peripheral areas (A, B, C, D, E, F, etc. shown in FIG. 11) on the CRT screen. G, H area)
If it is not in the peripheral area and the judgment is NO, one calculation process of the mode calculation routine 300 is completed, but if the judgment is YES, the calculation process from step 313 onward is completed. Execute.

First, regarding the arithmetic processing in steps 313 to 323, the map state explanatory diagrams in Figure 12 a, b, c, d, e, and f (11 to 45 are the numbers provided corresponding to the map numbers, and the diagonal lines are currently displayed. (indicates the map number) as well as an explanation. In these calculation processes, the composite AE flag is a flag that indicates the composite state of the two maps in the AE direction in Figure 11 (for example, Figure 12b), and the CG
The flag is a flag indicating the composite state of the two maps in the CG direction in Fig. 11 (for example, Fig. 12 c);
The BDFH flag is a flag indicating the composite state of the four maps in the BDFH direction in FIG. 11 (for example, FIG. 12d), and only one of each is set selectively.

Then, in steps 313 to 315, it is determined whether the AE flag, CG flag, and BDFH flag are set, and in steps 316 to 323, the current position is
It is determined where in the areas A, B, C, D, E, F, G, and H shown in FIG.

If the composite AE flag has been set by that time and the current position is in the C or G area (when the determination in step 313 is YES, the determination in step 318 is NO, and the determination in step 321 is YES), or at that time. When the composite CG flag has been set up to now and the current position is in area A or E (the judgment in step 314 is YES, the judgment in steps 319 and 322 is
If the answer is NO), the process proceeds to step 330 for selecting a composite partner.
In this composite destination selection step 330, the map number of the composite destination is selected from the area of the current position in correspondence with the previous composite map number in the positional direction. For example, if the composite map Nos. 23 and 33 is currently displayed as shown in Figure 12b, and the cursor indicating the current position is at point a (area C) in Figure 11,
In order to create a composite map as shown in Figure 12e, we selected the destination numbers 24 and 34, and currently
As shown in Figure c, if the composite map Nos. 33 and 34 is displayed and the cursor indicating the current position is at point b in Figure 11 (area A), the composite map as shown in Figure 12 e will be created. Select destination numbers 23 and 24. Then, proceed to the next absolute coordinate creation step 331, and create a new complex using the previous absolute coordinate data and the absolute coordinate data of the new compound destination number. Create the absolute coordinate data of the map.Then, proceed to the next travel route data conversion step 332, calculate coordinate conversion values using the previous absolute coordinate data and new absolute coordinate data, and perform the process according to this calculated value. The data of the current position of the travel trajectory in the second graphic memory 22 is converted in a sliding manner, and the X, Y coordinate data of the current position in the RAM 4C is also converted.Then, the process advances to map data shift step 333, and the map data shift step 333 is performed. 1 graphic memory 21
In the area where the current position exists (A, C,
Sequentially shift the half of the map data on the side (E or G) to the map data storage area on the opposite side (for example, when moving from Figure 12 b to e, shift the map data on the right half of the currently displayed map). Shift the map data to the left half of the storage area (or shift the map data of the upper half of the currently displayed map to the lower half of the storage area when changing from c to e of FIG. 12) and store it. Proceed to step 334 and then step 330
The map data corresponding to each partner's map number selected in step is read from the cassette tape 3a by masking it (only the map data is specified for each 1/4 screen in the remaining half), and the read map data is displayed in the first graph. It is stored in the storage memory 21. Then, the process proceeds to step 335, where the BDFH flag indicating the composite state of the four maps is set, and one calculation process of this mode calculation routine 300 is completed. As a result, the map of FIG. 12b or c, for example, becomes like that of FIG. 12e.

Also, when the composite CG flag is set and the current position is in one of the B, D, F, and H areas,
(When the judgment in step 314 is YES, the judgment in step 319 is NO, and the judgment in step 322 is YES) or when the composite B, D, F, H flags are set and the current position is in area C or G ( step
The judgment of 315 is YES, the judgment of steps 320 and 323 is
If NO), the process proceeds to composite map number selection step 340. In this composite map number selection step 340,
Select a new composite map number that corresponds vertically from the current location area to the previous composite map number (for example, number 33 as shown in Figure 12c).
If you are displaying the composite map number 34 and the cursor indicating the current position is at point C (area H) in Figure 11, you can move the new map number 23 and 33 to display the composite map as shown in Figure 12 b. Select the map number, and as shown in Figure 12d, the four composite maps No. 22, No. 23, No. 32, and No. 33 are displayed, and the cursor indicating the current position is at point a (area C). If so, 23 as shown in Figure 12b.
33). Then, the process proceeds to the map data mask reading step 343 through the next absolute coordinate step 341 and the driving route data conversion step 342 (the same calculation process as steps 331 and 332 described earlier), and then the step 340. Mask the map data for each map number selected in step 3a and read them from the cassette tape 3a (for example, if you want to do as shown in Figure 12b, map data No. 23 is read in the upper half and map data No. 33 is read in the lower half). half of the map data is read) and the read map data is stored in the first graphic memory 2.
Store it in 1. Then proceed to step 344.
A composite flag AE indicating the composite state of the two maps in the AE direction is set, and one calculation process of this mode calculation routine 300 is completed. As a result, for example, the map shown in FIG. 12c or d becomes as shown in FIG. 12b.

Also, when the compound AE flag is set and the current position is in the B, D, F, or H area (step
The judgment of step 313 is YES, and the judgment of steps 318 and 321 is
(NO), or when the composite BDFH flag is set and the current position is in area A or E (when the judgment in step 315 is YES, the judgment in step 320 is NO, and the judgment in step 323 is YES). Proceed to composite map number selection step 350. In this composite map number selection step 350, a new composite map number is selected from the current position area in a horizontal direction corresponding to the previous composite map number (for example, number 22 as shown in FIG. 12d). , No. 23, No. 32, 33
If the cursor indicating the current position is at point d (area E) in Figure 11 when the four composite maps numbered 4 are displayed, select new map numbers 32 and 33 shown in figure 12 f. 23 and as shown in Figure 12b.
If composite map number 33 is displayed and the cursor indicating the current position is at point f (area F) in Figure 11, select new map numbers 32 and 33 shown in figure 12 f). . Then, the next absolute coordinate step 351,
After the calculation process in the driving route data conversion step 352 (the same calculation process as in steps 331 and 332 explained earlier), the map data mask reading step is performed.
Proceeding to step 353, map data corresponding to each map number selected in step 350 is masked and read from the cassette tape 3a. Read the left half, map data number 33 on the right half)
At the same time, the read map data is stored in the first graphic memory 21. Then, the process proceeds to step 354, where a composite flag CG indicating the composite state of the two maps in the CG direction is set, and one calculation process of this mode calculation routine 300 is completed. As a result, for example, the map shown in FIG. 12 d or b becomes as shown in FIG. 12 f.

Also, when none of the BDFH, AB, and CG composite flags are set (when it is not a composite map)
If the cursor is in the A or E area, the determination at step 316 becomes YES and the process advances to step 360.
If the cursor is in area C or G, step
If the judgment of 317 becomes YES, proceed to step 370.
If the cursor is in B, D, F, H area, step
The determination in step 317 becomes NO and the process proceeds to step 380. Then, in steps 360, 370, and 380, the map number of the destination to be combined is selected based on the area where the current location exists (in steps 360, 370, one destination,
In step 380, there are three partners), in step 361,
In steps 371 and 381, absolute coordinate data of a new composite map is created using the absolute coordinate data of the map based on the map number of the destination selected previously and the absolute coordinate data of the previous map. And steps 362, 372,
382 calculates a coordinate exchange value using the previous absolute coordinate data and new absolute coordinate data, and slides the travel locus and current position data in the second graphic memory 22 according to this calculated value. At the same time as the conversion, the X and Y coordinate data of the current position in the RAM 4C is also converted. Then, in steps 363, 373, and 383, the map data in the first graphic memory 21 is shifted in the direction of the area where the current position exists. In this case, the step
In step 363, the map data is shifted by half in the A or E direction (if the current position is in area A, the upper half of the map data is shifted to the lower half, and if it is in area E, the lower half is shifted to the upper half), and in step 373, the map data is shifted by half in the A or E direction. Alternatively, shift the map data by half in the G direction (if the current position is in area C, shift the right half of the map data to the left half; if it is in area G, shift the left half to the right half), and then
383, shift the map data by 1/4 in the B, D, F, and H directions (if the current position is in area B, the upper right 1/4 of the map data will be moved to the lower left 1/4, and if the current position is in area D, the lower right 1/4) 4 to the upper left 1/4, and if it is F area, the lower left 1/4 to the upper right 1/4,
If it is in the H area, shift the upper left 1/4 to the lower right 1/4). Then, in steps 364, 374, and 384, the map data corresponding to the destination map number previously selected in steps 360, 370, and 380 is masked and read from the cassette tape 3a. , in step 374, the remaining half of the map data in the C or G direction is masked, and in step 384, 1/4 of each of the remaining three directions is masked and read)
At the same time, the read map data is stored in the first graphic memory 21. Therefore, for example, when item No. 33 in Figure 12a is currently displayed, if the cursor is in area A, it will be displayed as in Figure 12b, and if the cursor is in area C, it will be displayed as in Figure 12c. If the cursor is in the H area, the map is changed as shown in FIG. 12d, if the cursor is in the B area, the map is changed as shown in FIG. 12e, and if the cursor is in the G area, the map is changed as shown in FIG. 12f.

In addition, when updating to the composite map mentioned above, the travel route data conversion steps (332, 342, 352,
362, 372, 382), the current position is moved to the center.

Also, when the compound AE flag is set and the cursor is in area A or E (step 313,
When the judgment in step 318 is YES), when the composite CG flag is set and the cursor is in the C or G area (when the judgment in steps 314 and 319 is YES),
The BDFH flag is set and the cursor is at B.
When in the D, F, or H area (step
If the determinations at steps 315 and 320 are YES, the map will not be a composite map, so the arithmetic processing from the travel route data conversion step 390 described above is performed.

That is, in the mode calculation routine 300 shown in FIG. 9, the following operations are performed according to the touch data from the touch panel section 7, the input from the map update switch 8, 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 you are in map mode and there is a map update instruction,
The arithmetic processing for updating the composite map is executed as appropriate according to the position of the cursor at that time, and the graphic screen of the map is changed on the CRT display device 6, and at the same time, the travel trajectory and current position are also corrected and displayed.

Furthermore, if there is no map update instruction, the map display continues as is.

If there is an instruction to change while in 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 from the distance flag determination step 401 shown in FIG. 10, and it is determined in the interrupt calculation process shown in FIG. 8 whether or not the distance flag is set. At this time, if the distance flag is not set, the determination becomes NO and one calculation process of this current position calculation routine 400 is completed, but if the distance flag is set, the determination becomes YES and X Proceed to distance correction step 402. And this X distance correction step
At step 402, the X distance data Dx is corrected by the X distance component Dx obtained by interrupt calculation processing (DX = DX +
Dx), and in the Y distance correction step 403, the Y distance data DY is similarly corrected (DY=DY+Dy),
Proceeding to the first X distance determination step 404, it is determined whether the X distance data DX has reached a value of 50 m or more. At this time, if the X distance data DX is a value of 50 m or more, the determination becomes YES, and the process advances to step 405 to determine the right end of the X axis, where the current position is determined from the display screen using the X coordinate data of the current position stored in RAM 4C. It is determined whether the value deviates toward the right end. If the X-coordinate data is not the value that deviates from that value, the determination becomes NO, and the process proceeds to an X-distance subtraction step 406, where the value of 50 m is subtracted from the X-distance data DX, and the process proceeds to a display movement step 407, where the second graph is displayed. Current position data in memory 22 is 50m
The vehicle is moved in the forward direction (eastward) by the same amount, and the traveling locus data is also made to follow this movement.

If the determination in the first X distance determination step 404 is NO, the process proceeds to a second X distance determination step 408, 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 less than -50m, the judgment becomes YES, and the process goes to step 409 to judge the left end of the X-axis, and the RAM is
Based on the X coordinate data of the current position stored in 4C, it is determined whether the current position is a value that deviates from the display screen toward the left end. Then, if the X coordinate data is not the value that deviates from that value, the determination becomes NO, and the process proceeds to the X distance addition step 410, where the value of 50 m is added to the X distance data DX, and the display movement step is performed.
Proceeding to step 411, 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.

Then, when the judgment in the second X distance judgment step 408 is NO, the X-axis right end judgment step 405,
When the judgment in the axis left end judgment step 406 is YES, or after the display movement steps 406 and 411, the process proceeds to the Y component display movement processing routine 412, and the above step 404 is performed for the Y distance data DY calculated in the Y distance correction step 403. ~ Executes the same judgment and calculation processing as in 411. (If the display position is within the upper and lower display screens when the Y distance data DY reaches a value of 50 m or more in either the positive or negative direction, the second graphic memory 2
50 current position data and travel trajectory data in 2
Move by m in the corresponding direction. )and,
Proceeding to the next distance flag reset step 411, the distance flag is reset. In this current position calculation routine 400, when the current position data and travel trajectory data are changed, the X and Y coordinate data of the display position in the RAM 4C is also changed in the same way.

That is, in the current position calculation routine 400 shown in FIG.
Converts current position data and travel trajectory data.

Therefore, the current position data and traveling trajectory data in the second graphic memory 22 are calculated by repeating the main routine calculations by the mode calculation routine 300 and the current position calculation routine 400 and by the interrupt calculation shown in FIG. At the same time, the screen of the CRT display device 6 is selected according to the specified mode, and if it is in the map mode, the map graphic screen (including the display of the current position and driving trajectory) is displayed, and the character In the mode, a character screen for map designation shown in FIG. 6 is displayed.

In addition, in the above embodiment, the display position is CRT.
Map update switch 8 when in the peripheral area on the screen
In the above example, when you input the button, the display changes to the adjacent composite map of the adjacent district corresponding to the display position, but by using the operation switch to specify the up, down, left, and right directions, you can change the display to the map of the adjacent district according to the instruction. The display may be switched.

Further, although the map is updated using the map update switch 8, a recognition device that recognizes a voice indicating map update may be used. Alternatively, the map may be updated automatically. In this case, the map update switch determination step 308 in FIG.
is deleted, and in the next map update determination step 309, it is determined whether the current position is in any of the areas A to H in Figure 13. When the cursor is at point b or c), the composite map is automatically switched according to the area where the cursor is located.

Furthermore, although the composite map is created by combining 1/2 screen or 1/4 screen at a time, the ratio may be set to other values, or it may be made variable by manual operation. good.

Furthermore, although the direction detection device 2 for detecting geomagnetic field is shown as the direction detection means, it may be a device that detects the direction relative to the progress of the vehicle.

As described above, in the present invention, when a road map of a specific area is displayed on a display screen such as a CRT, when updating the display from this specific area to an adjacent area, it is possible to update the display from the currently displayed area. A composite map is displayed in which the boundary area with the newly displayed adjacent district is moved towards the center of the display screen.
This has the effect of being able to clearly display the connection between a specific district and its adjacent districts.

Moreover, in the present invention, when the current position belongs to the display switching area on the display screen, switching to the adjacent composite map is performed, so that the frequency of map display switching can be reduced, and furthermore, the frequency of map display switching can be reduced. An excellent effect is that when a map is displayed, the current position of the vehicle can also be displayed moving on the composite map.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
Figure 2 is a detailed electrical wiring diagram of the CRT controller in Figure 1, Figure 3 is an explanatory diagram showing the touch area of the touch panel section, Figure 4 is a configuration diagram showing the detailed configuration of the reading device, and Figure 5 is a cassette tape Figure 6 is an explanatory diagram showing the data area of the CRT display device, Figure 7 is a calculation flowchart showing the overall calculation processing of the main routine of the microcomputer, and Figure 8 is a calculation flowchart showing the entire calculation process of the main routine of the microcomputer. Figure 9 is a calculation flowchart showing the detailed calculation process of the mode calculation routine in Figure 7, and Figure 10 is the current position in Figure 7. A calculation flowchart showing detailed calculation processing of the calculation routine; FIG. 11 is an explanatory diagram for explaining the operation; FIG. 12 is an explanatory diagram for explaining the relationship between map numbers of multiple districts and the composite map state;
FIG. 13 is a display explanatory diagram for explaining the operation of another embodiment, and FIG. 14 is a block diagram showing the configuration of the present invention. 1... Direction detection device as direction detection means, 2
...Distance sensor 3a as distance detection means...
Cassette tape as a storage medium, 3, 4, 5...
...Reading device, microcomputer, CRT controller constituting control means, 6...CRT display device as display means.

Claims (1)

[Claims] 1. An in-vehicle navigator comprising a current position detection means for detecting the current position of the vehicle, and a display means for displaying the current position detected by the current position detection means on a road map display surface. A storage means storing map data for displaying a road map of a specific district on the display means and map data for road maps of a plurality of districts adjacent to the particular district; a determining means for determining whether or not a position belongs to a display switching area on the display screen; and when the determination by the determining means is affirmative, one of a plurality of districts adjacent to the currently displayed specific district;
an adjacent district selection means for selecting an adjacent district for display shifting based on the current position; and reading map data of the adjacent district selected by the adjacent district selection means from the storage means, and reading the read map data. and map data creation means for creating adjacent composite map data for moving the boundary between the adjacent district and the specific district toward the center of the display surface based on the map data of the specific district; and this map data Based on the adjacent composite map created by the creation means, the currently displayed map of only the specific district is shifted and displayed to a composite map in which the boundary portion is closer to the center of the display surface, and this shift is performed. An in-vehicle navigator comprising: display control means for moving the current position display to a corresponding position on the composite map display as the current position display is displayed.