JPH0246086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an in-vehicle map display device, in particular, a display means with a sub-display area, and is provided with data regarding a plurality of points constituting the map in advance, and displays an enlarged map of the vicinity of the current location in the sub-display area. to display,
The present invention relates to an on-vehicle map display device that improves vehicle travel guidance.

Conventionally, in-vehicle map display devices for assisting the travel of vehicles such as automobiles have been designed to sequentially calculate the current location of the vehicle and display a current location mark along with the displayed map on the screen of the display means. Are known.

However, since this type of device displays only one map in the map display area of the display means, the vehicle's current location can be recognized as a point in a wide area, and the vehicle's current location can be recognized as a point on a detailed map even though it is a narrow area near the vehicle's current location. In order to be able to recognize a point, it is necessary to provide a plurality of map patterns of different scales that include the same point, which tends to cause problems such as an unavoidable increase in data storage capacity. Alternatively, since each map pattern must be switched and displayed, the vehicle driver's recognition of each map pattern is likely to be misaligned, and it cannot be said to be sufficient for the purpose of vehicle driving guidance.

The present invention has been made in view of the above points,
The main purpose is to enhance driving guidance by allowing simultaneous viewing of a map in which the vehicle's current location can be recognized as a point in a wide area and a detailed map of the vicinity of the vehicle's current location. Therefore, as shown in FIG. 1, the present invention provides a display means M1 having a main display area and a sub-display area in which a map for vehicle travel guidance is displayed.
and point coordinate data in which each of the plurality of points constituting the map is defined as a point in a coordinate system relative to a predetermined coordinate origin, and point level data indicating a level corresponding to the scale of the displayed map. and a storage means M2 for storing both data; when displaying a map at a first scale in the main display area, point coordinate data of a point having point level data corresponding to the first scale is stored in the first scale; First data extraction means M3 extracting from the storage means M2
and a first display control means M4 for displaying a map constructed based on the point coordinate data extracted by the first data extraction means M3 in the main display area of the display means M1; and a map in the main display area. a current position display moving means M5 for displaying the current vehicle position within the main display area and moving the display within the main display area; a second data extraction means M6 for extracting point coordinate data of a point having point level data corresponding to the second scale from the storage means M2 among the points within a range that can be displayed in the sub display area; constructing an enlarged map near the current vehicle position in the main display area based on the point coordinate data extracted by the second data extraction means M6;
It is characterized by comprising: second display control means M7 for displaying the enlarged map in a sub-display area of the display means M1. Here, as shown in FIG. 2, the sub-display area corresponds to the area 1-1 indicated by solid diagonal lines in the map display area 1 of the display means M1, whereas the area 1-2 indicated by dashed lines is This is the main display area.

The in-vehicle map display device of the present invention having the above configuration displays a map based on the point coordinate data extracted from the storage means M2 according to the first scale and the corresponding point level data in the main display area of the display means M1. do. On the other hand, the sub-display area can include and display the vehicle's current position in the vicinity of the vehicle's current position displayed on the map in the main display area, that is, at a second scale that is larger than the first scale. The range is displayed as an enlarged map based on point coordinate data extracted according to the second scale and corresponding point level data. Furthermore. When the current position of the vehicle is moved within the map in the main display area by the current position display moving means M5, the aforementioned enlarged map of the vicinity of the moved current position of the vehicle is displayed in the sub display area.

Note that scale refers to the degree of reduction expressed as scale = (distance on the map) / (distance on the ground), and if the numerator of a large scale is 1, then the value of the denominator is small. , the opposite is true for small scales. For example, a map enlarged to display the vicinity of the vehicle's current position has a larger scale than a map displaying a wider area.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 32.

FIG. 3 shows a block diagram showing the overall configuration of this embodiment, and numeral 11 in the figure represents the display means M1.
CRT display, 13 is a ROM package as the storage means M2, 15 is a manual operation unit, 17 is an electronic control device for controlling map display control valves, etc., MPU 19, ROM 21,
It is equipped with a microcomputer consisting of a RAM 23, an I/025, etc., and a display controller 27, and receives at least an instruction signal from the manual operation section 15, performs arithmetic processing and display control according to the instruction signal, and displays a menu on the CRT display 11. Represents something that displays a cursor and a map. Reference numeral 29 is a direction sensor that detects the traveling direction of the vehicle, that is, the geomagnetic direction relative to the own vehicle, and reference numeral 31 is a distance sensor that detects the travel distance of the vehicle.

The manual operation section 15 is as shown in FIG.
AUTO key 33, switching key 35, reservation key 37,
It includes at least a drawing search key 39, a name search key 41, a set key 43, an upward movement cursor key 45, a downward movement cursor key 47, a leftward movement cursor key 49, and a rightward movement cursor key 51. keys 33, 35, 3
7, 39, 41, 43, 45, 47, 49, 51
When is operated, a corresponding instruction signal is output to the electronic control unit 17.

The map data stored in advance in the ROM package 13 consists of a header, a point information string, a route information string, and an article information string, as shown in FIG. Here, the header has administrative district information as shown in Figure 6, and the administrative district information consists of prefectural information such as Aichi prefecture information. For example, Aichi prefecture information is the address of the administrative district name on the article information column as described later. It consists of administrative district name address information corresponding to the administrative district, point start number information representing the first number of each point group that makes up the administrative district, and point number information that is the number of point groups that make up the administrative district. In addition, the point information string consists of a group of unit point information, as shown in FIG. Point type information consisting of point level information indicating whether the point has a name, name information indicating whether the point has a name, and landmark classification information, and a specific point (for example, Tokyo) of the point as the origin. It consists of map coordinate X component information and map coordinate Y component information expressed as a point on map coordinates (X, Y). In addition, the route information string is #1 to #N as shown in FIG.
Consisting of a route information column and #1 to #N address information specifying the address of each route information column, each route information column includes route number information representing the route and information that can be displayed with respect to the scale of the display map. Route level information indicating whether it is a route or not, and the type of route (e.g. national highway, prefectural road, coastline, expressway, etc.)
It consists of route type information representing the route, point number information of the points forming the route, and route end information indicating the end of the route. Further, the article information string has unit administrative district name information representing the name of an administrative district or point, as shown in FIG.

Next, the processing by the electronic control device will be explained with reference to FIGS. 10 to 31.

When the ignition switch (not shown) is turned on, the process shown in FIG. 10 starts to be executed, and in step 101 it is determined whether or not the memory backup is being performed normally. If so, then step 102
The image data already stored in the RAM 23, that is, the data related to the map that was displayed on the CRT display 11 when the ignition switch was recently turned off, is read out from the RAM 23 and the map is displayed via the display controller 27. Map display area 1 of CRT display 11
is displayed, and the process ends. On the other hand, if backup has not been performed, step 103 is executed instead of step 102, processing is performed to display the entire map in the main display area 1-2 of the CRT display 11, and the processing is ended. do. In this overall map display process, a scale is set so that the entire map can be displayed in the main display area 1-2, and based on this scale, map coordinates (X, Y) are changed to display coordinates (x, y). A coordinate transformation is performed.

Then, step 102 or step 103 above.
When the set key 43 is turned on with the current location mark placed at the current location on the displayed map by moving the current location mark superimposed on the displayed map using the cursor keys 45 to 51, the display shown in FIG. The process shown in is started, and first, in step 201, a process is performed to display a new map centered on the current location in the main display area 1-2, and then in step 202, the process is performed to display a new map centered on the current location in the main display area 1-2.
1, a process for displaying an enlarged map centered on the current location is performed, and the process shown in FIG. 11 is completed.

The new map display process and the enlarged map display process executed in step 201 and step 202 are as shown in the flowchart of FIG. Reads the contents of the first address in the data route information string. Next, step 302 is executed to determine whether the contents of all addresses have been read. At this point, the contents of the first address have just been read, so the determination result is "NO" and the next step 303 is executed.
In step 303, the root level information of the #i route information string (#1 route information string) indicated by the #i address (the first address at this point) is read. Here, the root level information can be thought of as the relative importance assigned to each route. Next, step 304 is executed to check whether the root level is a displayable level or not, in other words, #i root (#1
route) has a degree of importance that should be displayed for the specified scale. If the #i route (#1 route) is a route that does not need to be displayed, step 305 is executed to update the address, that is, read the contents of the next address (#2 address), and the process returns to step 302.
On the other hand, if #i route (#1 route) is the route to be displayed, then step 306 is executed.
Read out the point number information (at this point, the first point number information) of the #i route information string (#1 route information string). Next, step 307 is executed to determine whether the route end information of the #i route information string (#1 route information string) has been read out. At this point, since the starting point number information has just been read out, the judgment result is "NO", and then step 308 is executed and the point number (starting point number) is read out.
The point level information given to the point number in the point information string that matches is read out, and it is determined whether the point has a degree of importance that should be displayed for the specified scale. Even if this location is not displayed, if it is a good location, proceed to the next step.
Return to 306 #i route information string (#1 route information string)
Read the next point number at. On the other hand, if this point is the point to be displayed, the next step is
309 to determine whether it is the first point number extracted in the #i route information sequence (#1 route information sequence). At this point, since it is the first point number, the judgment result is "YES", and then steps 310 to 313 are executed, the map coordinate X part and the map coordinate Y component of this point are read out, and this coordinate point (X, Y) Display coordinate point (x1,
y1), and further find the area A to which the display coordinate point (x1, y1) belongs. As shown in FIG. 13 representing the map coordinate system and FIG. 14 representing the display coordinate system, this coordinate conversion process begins with (1) the shaded area in the display coordinate system (the main display area 1 of the CRT display 11); -2 or sub display area 1-
Corresponds to 1. ), find the point (MPOS, BPOS) corresponding to the coordinates (X, Y) of the map coordinate system that correspond one-to-one with the origin (0, 0), and then (2) find the found point (MPOS, BPOS). ), the coordinates of the current target point (LPOS, APOS) are converted to a point (x1, y1) in the display coordinate system. Here, the above points (MPOS, BPOS) are obtained as follows.
First, determine the current location as the display map center coordinates (MAPCENX, MAPCENY) in the map coordinate system,
Next, this coordinate information MAPCENX, MAPCENY,
The number of dots a and b in the map display area 1 of the CRT display 11 (Fig. 15), the number of dots per unit of longitude LDOT determined according to the specified scale,
Points (MPOS, BPOS) are found from the following equation, which uses the number of dots per unit latitude, ADOT, as a parameter: MPOS=MAPCENX-b/LDOT BPOS=MAPCENY+a/ADOT. The point (x1, y1) is found from the following equation: x1 = (LPOS - MPOS) x LDOT y1 = (BPOS - APOS) x ADOT. On the other hand, the area determination process is performed by determining whether the display coordinate point (x1, y1) obtained by the coordinate conversion process as described above belongs to the main display area 1-2 or the sub display area 1-1. It will be done. When the area A of the display coordinate point (x1, y1) is determined in step 313 described above, the process returns to step 306 and reads out the next point number in the #i route information string (#1 route information string). Next, execute step 307 to determine whether the route has ended or not. If the route has not ended, then execute step 308,
It is determined whether the point level of this point number is at a displayable level or not. If it is not a displayable level, the process returns to step 306. If it is a displayable level, then step 309 is executed, and this point number It is determined whether or not is the point number extracted first in the #i route information sequence (#1 route information sequence). At this point, since the first point number has already been extracted, the judgment result is "NO", and then steps 314 to 317 are executed sequentially, and the same processing as steps 310 to 313 above is performed. Processing takes place. In other words, this point number (#j
Convert the point coordinates (X, Y) of point number) to display coordinates (x2, y2) and display coordinates (x2, y2)
Find area B of . Then execute step 318 and
Whether or not to perform a connected display of points (x1, y1) and points (x2, y2), that is, the above area A and the above area B are both the main display area 1-2 or the sub display area 1-1. Decide whether or not. Area A and Area B
If at least one of the areas is not the main display area 1-2 or the sub-display area 1-1, then steps 319 and 320 are executed to update the area and change the coordinates (x2, y2) from area B to area A. (x1, y1)
Then, the process returns to step 306.
On the other hand, if there is a specific relationship as described above, then step 321 is executed and a connecting line between the points (x1, y1) and (x2, y2) is displayed on the display screen.
Then, steps 319 and 320 are executed to perform area update processing and coordinate update processing, and the process returns to step 306.
Thereafter, the route consisting of steps 306, 307, and 308, or steps 306, 307, and 308 plus steps 309, 314, or 321 (or 321 in some cases) until the end of the route of #i route (#1 route) is read out. ) is selected and executed, and the route for #i route (#1 route) is displayed. Then, when the route end of #i route (#1 route) is read, the step
Since the determination result of step 307 is reversed to "YES", step 305 is executed next to update the address, and the next route (#2 route) is processed in the same way as the process for the #1 route. be exposed. Thereafter, the same process as above is executed sequentially for each route information string, and when the process for #N route information string is completed, it is determined in step 302 that the contents of all addresses have been read, and the map display process is completed. do.

Next, a search method performed prior to registration of a reserved map will be explained with reference to FIGS. 16 to 26.

When the name search key 41 of the manual operation unit 15 is turned on, the process shown in FIG.
Processing is performed to display a message as shown in FIG. 17 in the display area. Next, prefecture name processing as shown in FIG. 18 is executed. In this prefecture name processing, first step 501 is executed, and the first prefecture address (the address corresponding to the Aichi prefecture information in the administrative district information shown in FIG. 6) is set in the pointer. Next, step 502 is executed to read out the administrative district name information from this prefecture information and display this name together with the cursor on the CRT display 11 screen. Next, step 503 is executed and a predetermined number (the total number of prefectures that can be displayed by the map data)
It is determined whether the name of the prefecture is displayed. If the predetermined number of prefecture names have not yet been displayed, then step 504 is executed to read out the prefecture name of the next address and display it on the CRT display 11. When a predetermined number of prefecture names are displayed on the CRT display 11, the step
The determination result in step 503 is reversed to "YES", and step 505 is then executed. In step 505, it is determined whether a key input has been made from the manual operation section 15 or not. When it is determined that a key input has been made,
Next, step 506 is executed, and the operated key is either the upward movement cursor key 45 for moving the cursor position upward, or the downward movement cursor key 47 for moving the cursor position downward. It is determined whether the leftward movement cursor key 49 for moving the cursor position leftward, the set key 43 for displaying the map, or any other key was operated by mistake. If it is the upward movement cursor key 45, then execute step 507, set a new prefecture address corresponding to the name of the prefecture currently corresponding to the cursor position in the pointer, and proceed to step 502 again. Return to On the other hand, if it is determined that the downward movement cursor key 47 has been operated, the next step is
Step 508 is executed, the prefecture state address of the next prefecture corresponding to the cursor position is set in the pointer, and the process returns to step 502. On the other hand, when the leftward movement cursor key 49 is operated, municipal processing is started next. On the other hand, when the set key 43 is operated, an administrative district name designation map display as described later in FIG. 24 is executed. In this way, in prefecture name processing, the prefecture name belonging to the entire map displayed by the ROM package 13 is
It is displayed on the display 11, and a cursor is also displayed. That is, CRT display 11
An image as shown in FIG. 19 is displayed above. Next, the municipal processing will be explained according to the flowchart shown in FIG. In FIG. 20, steps 601-608 correspond to steps 501-508 in the prefecture name processing shown in FIG. 18, respectively. Therefore, if the upward movement cursor key 45 is operated while the cursor position corresponds to, for example, Aichi Prefecture while prefecture name processing is being executed, the names of cities, towns, and villages belonging to that Aichi Prefecture will be displayed together with the cursor on the CRT display 11. be made to be Note that if the rightward movement cursor key 51 is operated during execution of the city, town, and village name processing, the prefecture name processing as described above is restarted. On the other hand, when the leftward movement cursor key 49 is operated, point name processing is started. Second
Figure 2 shows a flowchart of this point name processing. Steps 701 to 708 in the figure are the first
This corresponds to steps 501 to 508 in FIG. Therefore, when the cursor position corresponds to Nagoya City, for example, as shown in FIG. 21, if the leftward movement cursor key 49 is operated, the display form on the CRT display 11 changes as shown in FIG. 23. . Then, during the point name processing, press the set key 43.
When is operated, a point name designation map display process is performed in FIG. 25 as described later. On the other hand, when the set key 43 is operated during execution of prefecture name processing or municipality processing, administrative district name designation map display processing as shown in FIG. 24 is started. In this process, first step 801 is executed to extract point information of points belonging to the designated administrative district. Next, step 802 is executed, and the east end of the extracted points is
Find the four limit points, which are the points located at the west end, north end, and south end. Next, step 803 is executed to find the coordinates (MX, MY) of the center point of the administrative district from these four limit points. This is determined by calculating the following formula: MX = (X coordinate of east end + X coordinate of west end)/2 MY = (Y coordinate of north end + Y coordinate of south end)/2. Next step
Execute 804, administrative district Zenwei CRT display 1
Calculate the scale that can be displayed on 1. Step 805 is then executed to display a map of the administrative district on the CRT display 11. This map display process is as described above in FIG. On the other hand, if the set key 43 is operated while the point name process is being executed, a point name designated map display process as shown in FIG. 25 is started. In this map display process, step 901 is first executed, and the designated point is set as the center coordinate (Mu, My). Next, step 902 is executed to select the maximum scale S that can be displayed on the CRT display 11 with this point as the center. Next, step 903 is executed to display a map according to the selected scale. Note that this map display processing is as described above in FIG.

On the other hand, the drawing search key 3 of the manual operation section 15
9 is turned on, drawing search processing as shown in FIG. 26 is started. In this search process, first step 1001 is executed to display a map of the entire map area that can be displayed on the CRT display 11 using the map data in the ROM package 13. Next, step 1002 is executed to display a cursor at the center position of the displayed map. Next, step 1003 is executed to determine whether or not a key input has been made from the manual operation section 15. If there is a key input, step 1004 is executed to determine which key the input key is. If the input key is the cursor key 45, 47, 49, or 51, step 1005 is executed to move the cursor according to the operated cursor. On the other hand, if it is the set key 43, step 1006 is executed, and an enlarged map is also displayed this time.

CRT by name search process or drawing search process
After the desired map is displayed on the display 11, when the reservation key 37 is turned on, the process shown in FIG. 27 is started. In this process, step 1011 is executed first, and the RAM 23
The content of the write pointer that specifies the address of the reserved map information storage area in is set to j.
Next, step 1102 is executed to write the X coordinate information of the center of the currently displayed display map into the reserved map center X coordinate status information storage section in the reserved map information storage section #j. Next, step 1103 is executed, and the Y coordinate information of the center is written in the reserved map center Y coordinate information storage section in the reserved map information storage section #j. Next, step 1104 is executed to write the scale of the displayed map, that is, the displayed map scale information, to the reserved map scale information storage section of the reserved map information storage section #j. Next, step 1105 is executed to increment j. In this way, the process shown in FIG. 27 is completed. Therefore, #j
Information as shown in FIG. 28 is written in the reserved map information storage section. In this way, the process shown in FIG. 27 is executed every time the reservation key 37 is turned on, and a reservation is made for the desired map.

FIG. 29 shows the process that is started every time the switching key 35 is turned on. In this process,
First, step 1201 is executed, and it is determined whether or not the automatic mode is set, that is, whether or not an enlarged map centered on the current location is displayed in the sub display area 1-1. If it is determined that the mode is auto mode, then step 1202 is executed to perform processing for erasing the enlarged map displayed in the sub display area 1-1. Next, step 1203 is executed to read the #k reserved map information designated by the display pointer as shown in FIG. Next, step 1204 is executed to perform processing for displaying the new map #k reserved map in the sub display area 1-1, and the present processing ends. Meanwhile, step 1201
If it is determined that the auto mode is not set, step 1205 is executed, and k is (j-1) (here, j is the reservation map information storage section specified by the write pointer as shown in FIG. 30). corresponds to the number of ) or higher. k is (j−
If it is less than 1), then step 1206 is executed, k is incremented, and then steps 1203 and 1204 are executed in sequence, and the process ends. On the other hand, in step 1205 above, k is (j
-1) If it is determined that the above is the case, then step 1207 is executed, and after setting k to "1", steps 1203 and 1204 are executed in sequence, and the present process ends. In this manner, in the process shown in FIG. 29, if the auto mode is currently in effect when the switching key 35 is turned on, the currently displayed enlarged map centered on the current location will be deleted and the reserved map will be displayed instead. It will look like this. On the other hand, if the auto mode is not set when the switching key 35 is turned on, the reserved map will be switched and displayed.

FIG. 31 shows the process that is started every time the AUTO key 33 is turned on. In this process, step 1301 is first executed to determine whether or not the current mode is auto mode. If the mode is auto mode, this process ends without performing any processing. On the other hand, if it is not the auto mode, then step 1302 is executed to erase the reserved map currently displayed in the sub display area 1-1. Next, execute step 1303 to change the current location on the map displayed in main display area 1-2 to sub display area 1-2.
Perform processing centered on point 1. Next, execute step 1304 and multiply the scale of the display map displayed in the main display area 1-2 by α (α is greater than 1) to obtain the scale of the map to be displayed in the sub display area 1-1. Set. Next, step 1305 is executed to display a map centered on the current location in the sub-display area 1-1, which has been enlarged to the above-mentioned scale, and the process ends.

In addition, after an enlarged map centered on the current location is displayed in the sub-display area 1-1, as the vehicle advances, a message indicating that the vehicle's current location has reached a preset map display switching frame in the sub-display area 1-1 is displayed. Once determined, processing is performed to newly display an enlarged map centered on the vehicle's current location at the point. This map display process is similar to the enlarged map display process described above. In addition, in making the above judgment, by comparing the display coordinates of the sub-display area 1-1 corresponding to the map display switching frame and the display coordinates of the vehicle's current location in the sub-display area 1-1, the vehicle's current location is displayed on the map. It is only necessary to determine whether the switching frame has been reached.

FIG. 32 shows a schematic block diagram representing another embodiment of the invention. In the figure, 53 is a microcomputer, 55 is a video RAM (VRAM) that exclusively stores data for displaying messages, marks, etc. on the CRT display 11, and 57 is a CRT.
Video RAM (VRAM) in which the image data of the map displayed on the display 11 is stored; 59 is a map-dedicated video similar to the map-dedicated VRAM 57 mentioned above;
RAM (VRAM) 61 is a switch means, and map-only VRAM 57 or map-only VRAM 59
This is for switching the connection with the CRT display 11, and the microcomputer 5.
The items controlled by the instructions No. 3 are respectively shown. In this example, VRAM1 display mode and
It has two display modes, the VRAM2 display mode, and in the VRAM1 display mode, the switch means 61 is in the state shown, and the VRAM dedicated to the map is
57 is sent to the CRT display 11, and the main display map is displayed on the display screen of the CRT display 11. During this time, map data for switching is written to the VRAM 59 dedicated to other maps. Simultaneously with the completion of writing, the switching means 61 is switched and the switching map is displayed in the sub-display area of the CRT display 11. On the other hand, in the VRAM2 display mode, the map data in the map-dedicated VRAM 59 is sent to the CRT display 11 and the map is displayed in the main display area of the display 11, and during this time the map data for switching is stored in the map-dedicated VRAM 57, and the writing ends. At the same time, the switch means 61 returns to the state shown.
A map for switching is displayed in the sub display area of the CRT display 11. The message, mark, etc. dedicated VRAM 55 is a VRAM for displaying the above-mentioned functional messages, marks such as the current location or destination, and the driving trajectory, and is always maintained in a state of connection with the CRT display 11.
It is displayed overlappingly with the map displayed on the CRT display 11. In this way, this example is dedicated to two maps.
A VRAM is provided and the map is displayed on the CRT display by alternately switching between them, thereby making it possible to shorten the time required to display the map.

As explained above, the in-vehicle map device according to the present invention does not include dedicated map data in the main display area or sub display area.
It simply has data common to both areas. Therefore, an increase in data storage capacity can be avoided. Furthermore, using common data related to maps, the main display area displays a relatively wide map and also displays the vehicle's current location within the map, while the sub display area displays the main display area. Displays an enlarged map of the vicinity of the vehicle's current location in the area. In other words, the point coordinate data that makes up the enlarged map of the sub-display area,
Since selection is made using point level data corresponding to a scale larger than the scale of the map in the main display area, an enlarged map using the aforementioned common data can be displayed in the sub display area. Therefore,
The vehicle driver can simultaneously recognize the vehicle's current location in a wide area and the detailed vehicle location in the expanded region near the vehicle's current location, although it is limited to a narrow area, thereby enhancing vehicle driving guidance. It is hoped that this will be fully achieved. Moreover, since the enlarged map displayed in the sub-display area is updated and displayed according to the actual movement of the vehicle, it can further contribute to vehicle travel guidance.

In addition to the ROM package, the map data storage medium may also be a magnetic disk, magnetic tape, magnetic valve, or the like. Needless to say, a data reading device is used in this case.
Further, the display means may be composed of a liquid crystal dot display other than a CRT display, or an LED.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration diagram of the present invention, FIG. 2 is a configuration diagram showing an example of a display area according to the present invention, and FIG.
31 shows one embodiment of the present invention, FIG. 3 is a block diagram showing its overall configuration, FIG. 4 is a diagram showing an example of the arrangement of operation keys of the manual operation section 15, and FIG. 5 is a data configuration diagram of the map data stored in advance in the ROM package 13, No. 6
The figure below shows the data structure of the header, Fig. 7 shows the data structure of the point information string, Fig. 8 shows the data structure of the route information string, Fig. 9 shows the data structure of the article information string, and Fig. 10 shows the data structure of the ignition information string. Figure 11 is a flowchart showing the process when the setting switch is turned on.
Figure 2 is a flowchart showing the map display process, Figures 13 to 15 are explanatory diagrams to explain the above map display process, and Figure 16 is when the name search key is turned on.
Figure 17 is a flowchart showing the process when the search message display process is performed.
Figure 18 is a flowchart showing the prefecture name processing in Figure 16. Figure 19 is a CRT display display format diagram in the above prefecture name processing. Figure 20 is a city/town/village name in the above prefecture name processing. A flowchart showing the process,
FIG. 21 is a diagram of the display format of the CRT display in the above municipality name processing, FIG. 22 is a flow chart showing the point name processing in the above municipality name processing, and FIG. 23 is a diagram of the display format of the CRT display in the above location name processing. Figure 24 is a flowchart showing the administrative district name designation map display processing in the above city/town/village name processing, Figure 25 is a flowchart showing the point name designation map display processing in the above point name processing, and Figure 26 is performed when the drawing search key is turned on. FIG. 27 is a flowchart showing the process performed when the reservation key is turned on; FIG. 28 is a configuration diagram of data stored in the #i reservation map information storage unit by the process in FIG. 27; FIG. 29 is a flowchart showing the process. The figure is a flowchart showing the process performed when the switch key is turned on, Figure 30 is a diagram showing the relationship between the reserved map storage area, the display pointer, and the write pointer, and Figure 31 is a flowchart showing the process performed when the AUTO key is turned on. The chart and FIG. 32 show block diagrams of other embodiments of the present invention. M1...Display means, M2...Storage means, M3...
...First extraction means, M4...First display control means, M5...Current position display moving means, M6...Second extraction means, M7...Second display control means, 1
-1...Sub display area, 1-2...Main display area.

Claims (1)

[Scope of Claims] 1. Display means having a main display area and a sub-display area in which a map for vehicle travel guidance is displayed, and a coordinate system for each of a plurality of points constituting the map with respect to a predetermined coordinate origin. storage means for storing both data, comprising point coordinate data defined as a point in the system and point level data indicating a level corresponding to the scale of the displayed map; when displaying a map, a first data extracting means for extracting point coordinate data of a point having point level data corresponding to the first scale from the storage means; a first display control means for displaying a map configured based on point coordinate data in the main display area of the display means; displaying the vehicle current position on the map in the main display area; a current position display moving means for moving within a display area; a second data extraction means for extracting point coordinate data of a point having point level data corresponding to a scale of 2 from the storage means; and based on the point coordinate data extracted by the second data extraction means, A vehicle-mounted map display device comprising: second display control means for configuring an enlarged map of the vicinity of the vehicle's current position in a main display area and displaying the enlarged map in a sub-display area of the display means.