JPH03150411A - On-vehicle navigator - Google Patents

Abstract

PURPOSE:To make a display while varying the amount of information included in a map by storing map data which differ in scale individually and displaying different-scale road maps by using the data. CONSTITUTION:A microcomputer 4 calculates the track and current position of a vehicle by using the outputs of an azimuth detecting device 1 and a distance sensor 2 and they are displaced on a CRT display device 6 through a CRT controller 5 together with a map. The map data are stored in a cassette tape 3a and necessary data are read out through a reader 3 and displayed. Maps which contain much information by increasing the scales are stored in the cassette tape 3a together with the map with the normal scale and they are used by being switched according to an input from a map changeover switch part 8.

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.

[Prior art] Conventionally, this type of device was disclosed in Japanese Patent Application Laid-open No. 52-141662.
There is a "traffic display device" which reads the map recorded on a recording medium such as microfilm with an optical reader using a vidicon camera etc., displays the road map of a specific area on the display device, and displays it. The road map can be enlarged or reduced by zooming.

[Problem to be solved by the invention]

However, since the enlargement/reduction (scale change) of the road map by the above device is performed simply within the range of the displayed road map, the amount of information displayed does not change, and the display simply becomes difficult to read. It is.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an in-vehicle navigator that can also change the amount of information when changing the scale of road display in a specific area.

[Means to accomplish the task]

In order to achieve the above-mentioned object, the present invention, as shown in FIG. 11, includes a current position detection means for detecting the current position of a vehicle, a storage means for storing map data for displaying a road map, and a storage means for storing map data for displaying a road map. In an in-vehicle navigator comprising display means for displaying a road map based on map data from the means and additionally displaying the current position detected by the current position detection means on the road map, the storage means: First map data for displaying a specific road map and first scale data indicating the scale of the road map are stored, and second map data of a road map with a different scale for the specific road map is stored. The second scale data indicating the scale of the road map is stored in the map data, and generates a change instruction for displaying a road map with a different scale from the road map displayed on the display means. a changing means for reading first map data from the storage means to display a specific road map on the display means, and reading second map data from the storage means according to a change instruction from the changing means; map display control means for switching and displaying road maps of different scales on the display means; and when the map display control means switches and displays road maps, at least the second scale data stored in the storage means and the second scale data stored in the storage means; The present invention is characterized by comprising a current position correcting means for correcting and displaying the current position displayed on the display means based on the first scale data.

[Effect]

In the above configuration, map data for displaying a specific road map and map data with a different scale for the specific road map are stored in the storage means, and the changing means generates an instruction to change the scale of the road map. Then, map data of a road map having a different scale from the currently displayed road map is read out from the storage means, and the road map is displayed on the display means. Furthermore, when displaying the road map with a different scale, the current position displayed on the display means is corrected based on at least the second scale data stored in the storage means and the first scale data. Is displayed.

〔Effect of the invention〕

As shown in the above structure and operation, in the present invention, map data of different scales are individually stored and used to display road maps of different scales, so that roads in a specific area can be displayed. When changing the scale of the road map, it is possible to display a map with a different amount of information, and when changing to a road map display with a different scale, the current position display can be corrected to the corresponding position on the new road map. There is an excellent effect that can be done.

〔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 Figure 1, ■ is a direction detection device r (blank below) as a direction detection means, which detects the geomagnetic
Equipped with a direction sensor that detects the Y component and an A/D converter that converts the signal from this direction sensor into a digital signal,
X depending on the direction of travel of the vehicle.

It generates a Y component digital signal.

2 is l! ! = i A distance gξ7 sensor serving as a detection means, which generates a distance pulse every unit traveling distance of the vehicle (for example, about 39.2α). Reference numeral 3 denotes a reading device that reads map data of a specific district by setting a cassette tape 3a serving as a storage means that stores map data of a plurality of districts (including absolute coordinate data of the upper right point of each map). It's something to explore and find out.

4 is a microcomputer that executes software digital arithmetic processing according to a predetermined control program, and is equipped with (!PU4a, ROM4b, RAλ14c, I10 circuit section 4dt), receives power from the on-board battery and generates a stabilized voltage of 5V. It is activated by receiving a stabilizing voltage from a source circuit (not shown), and the Performs arithmetic processing in response to distance pulses, reading signals from the reading device WS, etc., and generates a map of a specific area and a running rod E f
It generates a display signal for displaying f51P and the like. Note that the RAM 4c is constantly backed up by the on-vehicle battery.

Reference numeral 5 denotes a cathode ray tube (hereinafter referred to as OR'l') controller, which 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 map data and the stored map data. It generates a video signal and a synchronization signal for displaying driving route information or character data in CR1. Reference numeral 6 denotes a CRT display device as a display means, which displays a map, driving route, or characters of a specific area in a CR1 manner based on the image storage signal and synchronization signal from the ORT controller 5. Reference numeral 7 denotes a touch panel unit, which is attached to the display surface of the CRT display unit 6, and outputs a serial signal corresponding to a specific touch area of the 12 divided touch areas provided on this touch panel. It happens. Reference numeral 8 denotes a map changeover switch unit as a changing means, which is used to switch the map displayed on the C'RT display device 6 to another map with a different shakuho.
It is equipped with two switches (an enlargement switch and a reduction switch). And reading device W3. Microcomputer 4. The CRT controller 5 constitutes a control means.

Next, a detailed electrical connection diagram of the C'RT controller 5 shown in FIG. 2 will be explained. 11 is 12゜096MB
An oscillation circuit that generates an oscillation signal of g, 12 is an oscillation circuit 11
13 is a dot counter that divides the frequency of the oscillation signal and generates a 6,048 MHz dot timing clock and a 756KE character timing clock; 13 is an instruction (command) from the microcomputer 4 and a character timing clock from the dot counter 12; The display controller 14 generates horizontal and vertical synchronization signals, display timing signals, refresh memory address signals, and raster address signals.The display controller 14 holds 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 (HOL) terminal of the microcomputer 4. 15 is microcomputer 4
The address signal from the microcomputer 4, the refresh memory address signal from the display controller 13, and the raster address signal from the microcomputer 4 (
HOL D A) multiplexer switched by signal, 16. 18 is a bus driver 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 code 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 20 is a character generator that outputs a display pattern by using the display address from the character memory 19 and the raster address signal from the display controller 13. 21 is a first graphic memory for storing map data from the microcomputer 4; 22 is a second graphic memory for storing travel route information (correct action trace data, location data) from the microcomputer 4; 23; 24.25
26 is a parallel-to-serial (P→S) converter that converts the variable A/signal from the graphic memories 21 and 22 of the character generators 2o, lil, and iz into serial data using the dot timing clock from the dot counter 12; The reception of signals from the p-+8 converter 23 and the P→S converter 24 and 25 is switched by the display timing signal from the display controller 13 in order to select the graphic and character screens by the microcomputer 4 or the rough screen switching signal. A video controller 27 that generates a video signal is an exclusive off circuit that generates a synchronizing signal using horizontal and vertical synchronizing signals from the display controller 13. In addition, the character memory 19 and the first and second graphic memories 21 and 22 are always backed up with an ElIi source from the on-vehicle bar/coupler.

That is, in this CRT controller 5, based on the data sent from the microcomputer 4, character data is stored in the character memory 19, map data is stored in the first graphic memory 21, and display data of the travel trajectory and current position is stored in the second graphic memory 19. Always stored in memory 2z,
The screen switching signal from the microcomputer 4 selects the graphic screen (displaying the travel trajectory and current position on the map) and the character screen (displaying specified characters, etc. to specify the district). The video signal and synchronization signal to display the corresponding screen on the CRT
This has occurred on the display device 6.

Further, the touch panel section 7 has three parts as shown in FIG.
It has 12 touch areas numbered 1 to 42, and is composed of two pieces of glass and a transparent conductive film formed in a matrix on each glass.When a specific touch area is pressed, the glass The touch area is detected by the contact of the transparent supporting WL film of the matrix due to deflection, and a serial signal (consisting of a start signal and a touch information signal) corresponding to the detected touch area is generated by a touch signal generation circuit (not shown). There is. Note that this touch signal generation circuit generates touch information at that time in the form of a serial signal every 40 m 8e c.

Furthermore, *41m (at indicates the data area corresponding to one district in Rikishichit Tape 3&,
is the header section, and as shown in Figure 4(b), the map number A (1), the absolute coordinates of the upper right point of the map (coordinates relative to the North Pole) data A (''), and the map are displayed as OF'j''. When doing this, the distance per lWJ element, that is, the measure A(3),
It consists of a scaled map number A(4) with a different scale for the area that includes the map, and an enlarged map number A(5) with a different scale that displays a specific area of the map in detail. Of these, the data for enlarged map number A (5) is
The format is such that selection can be made by positioning the cursor on the CRT screen. (For example, the screen is brightened by 4 minutes, and the area at the cursor position is displayed as a twice-enlarged map.) B is a map data section storing map data for that area, and X is a blank section. Therefore, this A.

By reading part B with the reading device 3, it is possible to provide the microcomputer 4 with map data of a specific area, absolute ILR degrees, and map numbers with different scales of the map.

The operation of the above-mentioned Park I will be explained together with the display explanatory diagram in Fig. 5 and the calculation flowcharts shown in Figs. FIG. 7 is a calculation flowchart showing the operation processing of the interrupt calculation routine based on the distance pulse from the distance sensor 2, and FIG. 8 is a calculation flowchart showing the detailed calculation processing of the mode calculation routine in FIG. 6. Flowchart, No. 9
This figure 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 7 shown in FIG. 1, when the key switch is turned on at the start of operation, Jt
Each part of the electrical system becomes operational in response to Km supplied from the battery. Then, the microcomputer 4 receives a stabilized voltage of 5V of 1/C from the stabilized power supply circuit and enters the operating state, starts its arithmetic processing at the start step 100 in FIG. Proceeding to 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 calculation processes of the mode calculation routine 300 and the used position gi calculation routine 400 are repeatedly executed at a frequency of several tens of milliseconds.

That is, in this mode calculation routine 300, one of the map mode and character mode is selected, the content corresponding to the mode is displayed on the CRT, and when the map mode is selected, the cursor indicating the current position can be moved, and the map mode is also displayed. A calculation process is executed to enable map switching according to an instruction from the changeover switch unit 8, and also to designate a specific area on the map when in the character mode, and the process proceeds to a current position calculation routine 400. This current position calculation routine 40
0, the contents of the current position data in the second graphic memory 22 in the ORT controller 5 are changed with a travel change of ±50 m for each of the -7, P- and travel @ trace data x and Y components. The calculation process 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 current position arithmetic routine 400 is repeatedly executed at a cycle of several tens of 271 sθC culm degrees.

When the distance pulse from the distance sensor 2 is applied to the microcomputer number interrupt (engine NT) 11 for the return calculation of this main routine, ! Itashi computer 4 temporarily suspends the calculation processing of the main routine and
The interrupt calculation process shown in the figure is executed. That is, the arithmetic processing is started from the interrupt start step 501, and f1i
Proceeding to calculation step 502, the unit distance data (equivalent to approximately 39.2 ff) is integrated and updated to the distance data p stored in the RAM 4c, and the process proceeds to distance determination step 503, where the distance data p becomes 6.25F7J. Determine whether it has been reached.

At this time, if the distance data p has not reached 6.25 m, the determination becomes No and the process proceeds to return step 510, but if the distance data p reaches 6.15 m, the determination becomes Y.
The state becomes ES, and the process proceeds to direction signal input step 504. Then, in this azimuth signal input step 504, the digital x and y component signals Xa and Ya (east and north are positive directions, west and south are negative directions) from the azimuth detection device 1 are inputted, and an average azimuth new output step is performed. Proceed to 505 and receive the previous orientation data Xo, Y.

(bearing data before traveling 6,25 m) and the current bearing data Xa, Ya to calculate average bearing data X, Y, proceed to distance component calculation step 506 (corresponding to Store the data Xa, Ya as Xo, D0 for next time, and redirect the distance data.
Proceeding to step 508, the distance data D is set to O, and the process proceeds to step 509, where the distance ll1t flag is set.
! The l11 flag is set, and the process advances to return step 510 to return to the previously interrupted main routine. That is, in this calculation routine, the distance data D is cumulatively updated every time a unit distance is traveled, and the distance data D is 6.2.
When the distance reaches 5 m, X reaches 6.25ff+, the distance piece 1 minute Dx and Dy in the child direction are calculated, and arithmetic processing is executed to set a distance flag.

Next, mode calculation routine 30 in the main routine
0's detailed revenge processing will be explained. In this mode calculation routine 300, the calculation process starts from the map changeover switch determination step 301 in FIG. , the process advances to map mode determination step 302 to determine whether or not the content of the mode area in RAM4a is map mode, and when it is in map mode, the determination becomes YES, and the process advances to map number search step 303 to store data in RAM4c. Based on the header part data and cursor position data for the currently displayed map data stored in
! RT Conversion/- Converts the travel route data in the second graphic memory 22 in the troller 5. In this case, first, control the string retrieval device 3 to search for the cassette tape position corresponding to the map number obtained in the previous step, retrieve this header part, and use its absolute coordinate 1 scale and the absolute coordinate 7 on the previous map. A coordinate conversion value is calculated based on the scale, and the data of the current position of the travel trace in the second graphic memory 22 is converted so as to slide according to the total γ value. Then, the process proceeds to map data reading and outputting step 305, where the map data of the force setting tape 3a is inputted via the reading device fi3, and the map data is outputted to the first graphic memory 21. Finish the calculation process. In other words, if you want to switch from the map screen to a reduced map that includes the area, press the reduction switch, and if you want to switch to an enlarged map of a part of that area, move the cursor to the enlarged position and press the enlargement switch. This allows the map to be displayed on the CRT display device 6 to be automatically switched.

-1 name ζ- On the other hand, the determinations in the map changeover switch determination step 301 and the map mode determination step 302 are N.

In this case, the process advances to touch data input step 306, where touch data from the touch panel section 7 is input and RA, M are input.
4 Store in c. Then, map mode determination step 3
Proceed to 07 and the contents of the moto area in RAM4c will be J.
44 times, the determination is YES when the map mode is selected, and the process proceeds to mode change determination step 308, where the touch data stored in the RAM 4c is the data indicating the mode change (No. It is determined whether the touch area 34 in FIG. 3 is the data when it is pressed. At this time, if the touch data is data indicating a mode change, the determination is YKEI, the process proceeds to character mode setting step 309, the contents of the mode area are set to character mode, and the process proceeds to character switching signal output step 310. The character switching signal for displaying the character screen on the CRT display device 6 is OR? This occurs in the video controller 26 of the 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. 3 is pressed, or data when no touch area is pressed (for example, data FF). ), the determination in the mode change determination step 308 becomes NO, and the process proceeds to the cursor movement determination step 311.

In this cursor movement determination step 311, it is determined whether the touch data is data when any of the touch areas 32.33, 35.3B, or 40.41 is pressed (cursor movement data). , if the touch data is not cursor movement data, the determination becomes NO and one calculation process of this mode calculation routine 300 ends; however, if the touch data is cursor movement data, the determination is XI! ! Cursor movement calculation step 31 when S is reached
Proceed to step 2. This cursor movement 'rri calculation step 312
Now, depending on the touch data, this touch data is 3.
2, 1, 2, or 33 is the data for pressing the touch area. Similarly, if the touch data is data for pressing the touch area 35, move the cursor westward.
If the touch data is data for pressing the touch area 40 or 41, the cursor is moved southward, and when the touch data is data for pressing the touch area 38, the cursor is moved eastward by a predetermined distance. The arithmetic processing for changing the contents of the graphic memory 22 of No. 2 is executed, and one arithmetic processing of this mode arithmetic routine 300 is completed.

On the other hand, if the determination in the map mode determination step 307 is No.
In this case, the process proceeds to mode change determination step 313, and it is determined whether or not the mode is to be changed using the same calculation process as in mode change determination step 308. At this time, when the mode is changed and the determination becomes Y'KS, the process proceeds to map mode setting step 314 and the RAM 4c is
Set the contents of the mode area in the map mode, and proceed to the travel route data conversion step 315 to convert the CRT control p-
The traveling route data in the second graphic memory 22 in the La 5 is converted. In this case, first, the reading device 3 is controlled to search for a specified district using its map No. 11, and the absolute coordinates of the searched district on the map (stored in the header section shown in Fig. 4) and the previous district are A coordinate conversion value is calculated using the absolute coordinate 1 scale data on the map, and the traveling trajectory and current position data in the second graphic memory 22 are converted in a sliding manner according to the calculated value. Then, the process advances to map data reading and output step 316.
The map data of the sumo wrestler tape 3m is inputted via the reading device 3, and the map data is outputted to the first graphic memory 21, and the process proceeds to map switching signal output step 31, where the map graphic screen is displayed on the CRT display device 6. Video controller 2 sends a map switching signal to display the map.
6, and one calculation process of this mode calculation routine 3004- 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 current location corresponding to this map is and the second graphic memory 2 to correct the cursor indicating the current location.
Convert the contents in 2. As a result, even if the map displayed on the CRT display w6 is changed, the travel trajectory and current location can be displayed in the area corresponding to the map.

On the other hand, the determination in the mode change determination step 313 is NO.
If so, the process advances to character calculation step 31B. When this character calculation step 318 is reached, the character mode is set and a character switching signal is being issued to the video controller 26.
The GRT display device 6 displays the entire character screen as shown in FIG. The numbers 02-4-68 shown in the center of this character screen are numbers that designate regions, regions, and districts, respectively, and each number is determined by the increment switch 5.
1, the addition T is updated by 1, and the decrement switch 52
The character calculation step 318 performs arithmetic processing such that the character is subtracted and updated by 1 at , set by the set switch 53 , and set to 9 by the reset switch 54 .

Note that the numerical data of this locality, region, and district, that is, the map number, is stored in the RAM 4c. Further, the aforementioned switches 51, 52, 53, 54 correspond to the touch areas 39, 40, 41, 42 in FIG. 3, respectively.

That is, the mode calculation routine 300 shown in FIG.
Now, the following operations 1 to 2 are performed according to the switch signal from the map changeover switch section 8, the touch data from the touch panel section 7, and the contents of the mode area in the RAM 4a.

■ If the map mode is in map mode and there is a map switching instruction, the map display is switched to a reduced or enlarged map.

(2) If there is an instruction to move the cursor when there is no instruction to switch the map and the map mode is not changed, arithmetic processing for moving the cursor is executed, and if there is no instruction to move the cursor 1, the map display is continued as is.

(2) If a mode change instruction is received while the map mode is in the map mode without a map switching instruction, the map mode is changed to the character mode and the character screen is displayed on the CRT display device 6.

- When there is no map switching instruction and the character mode is not changed, the map change can be accepted on the character screen as shown in FIG.

■ If a mode change instruction is received while the character mode is in the character mode without a map switching instruction, the character mode is changed to the map mode, and the graphic screen of the map is displayed on the CR1 display device 6, and at the same time, the track of the running shrimp 1 and the current position are also displayed. Correct and display.

Next, the current position calculation routine 4 in the main routine
The detailed arithmetic processing of 00 will be explained. In this current position meter calculation routine 400, the calculation process starts from the distance flag determination step 401 in FIG. 9, and in the interrupt calculation process in FIG. 7, it is determined whether the distance flag is set to 7. . At this time, if the distance flag is not set, the determination is N.

Then, one calculation process of the uniform position wide calculation routine 400 is completed, but if the distance flag is set, the determination becomes YFS and the process proceeds to the X distance correction step 402. Then, at this X distance am positive step 402, the X distance data DXtr-interrupt? i# Correction calculation using the calculated X distance component Dx (D I = D X + D
x ) Shi, Y\I! At the separation correction step 403, Yi!
! Correct the distance data DY in the same way (DY=DY+D7)
L/, proceed to the first X distance determination step 404 and proceed to the X distance data I) X is 50ff! It is determined whether the value is greater than or equal to the value. At this time, if the X distance data DI is a value of 50ff1 or more, the determination becomes YES, and the process proceeds to the X distance subtraction step 405, where the value of 50 m is subtracted from the The current position data in the graphic memory 22 of No. 2 is moved in the positive direction (eastward) by 5OFFI, and the traveling locus data is also caused to follow this.

-〃- Also, the determination in the first X distance determination step 404 is N
If O, the process proceeds to a second X distance determination step 407, where it is determined whether the X distance data X has become a value of 150 ffl or less. At this time, if the X distance data DX is 150 m or less (lfj, the determination will be YES, and the X distance r addition a
Proceeding to step 408, the value of 50 l is added to the X distance data DX, and the process proceeds to display movement step 409, where the position data in the second graphic memory 22 is moved in the negative direction (west direction) by 50 m. At the same time, the travel locus data is also made to follow along with this.

Then, when the judgment in the second X distance judgment step 407 is NO, or after the display movement steps 406 and 409, the process proceeds to the Y component display movement processing routine 410, and Yi! IJ data DY
, the same determination and calculation processing as in steps 404 to 409 described above is performed. (When the Y distance data 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
Set F11.1 in the corresponding direction by Off1. )
Then, the process proceeds to the next distance #flag reset step 411, where the distance flag is set to v.

That is, the current position calculation routine 40 shown in FIG.
0, the current position "I data" and running piece track data in the second graphic memory 22 are converted regardless of the side displayed on the CRT display device 6.

Therefore, the current position data and traveling trajectory data in the second graphic memory 22 are changed four-dimensionally by the repeated calculations of the main routine by the mode calculation routine 300 and the current position calculation routine 400, and 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 the map mode is selected, the map graphic screen (including the display of the current position and traveling trajectory) is displayed, and if the character mode is selected, the screen of the CRT display device 6 is selected. The character screen for specifying the map shown in the figure! l! make someone cheat

In the embodiment described above, the touch panel 1 has operation switches mounted on the display surface of the CRT display device 6. - Although the map changeover switch section 7 and the separately provided map changeover switch section 8 are constructed, both may be constructed from a matrix type push-button switch of the same machine. Also, the map changeover switch section 8 is omitted and the fifth
The character screen shown in the figure is configured as shown in No. 10♂, and a reduction switch 10a and an enlargement switch lob are provided, and the map changeover switch determination step 30 in FIG.
The calculation processes from step 1 to map data reading and outputting step 305 may be performed in the character calculation step 31B.

Further, in the above embodiment, the reduced map number and enlarged map number are stored as data in each header section A of the cassette tape 3a, but the reduced map number and enlarged map number corresponding to the cursor position are displayed in advance at that time. If you have a rule side that can be calculated from the map number of the map you are using,
It is not necessary to store the reduced map number (') and the enlarged map number (5) on the cassette tape 3&.

Furthermore, although the map changeover switch section 8 is shown as a change means, a voice recognition device that recognizes a change instruction given by a driver's voice and generates an enlargement or reduction signal may also be used.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIG. 2 is a detailed electrical wiring diagram of the CRT controller in FIG. 1, and FIG.
The figure is an explanatory diagram showing the touch area of the touch panel section.
Figure 5 is an explanatory diagram showing the pig area of the cassette tape, Figure 5 is an explanatory diagram showing the display state of the CRT display device, Figure 6 is a calculation flowchart showing the overall calculation processing of the main routine of the microcomputer, and Figure 7 is an explanatory diagram showing the pig area of the cassette tape. 8 is a calculation flowchart showing the calculation processing of the interrupt calculation routine based on the distance pulse from the distance sensor, FIG. 8 is a calculation flowchart showing the detailed calculation processing of the mote operation 1γ routine in FIG. A calculation flowchart showing detailed calculation processing of the current position calculation routine in Figure 6;
FIG. 10 is a display explanatory diagram for explaining another embodiment, and FIG. 11 is a configuration diagram showing the configuration of the present invention. 1... Orientation detection device, 2... Distance sensor, 3a...
・Cassette tape 23 as storage means...Reading device 4・
... Microcomputer, 5... CRT controller, 6... CRT display device as display means, 8...
・Map changeover switch unit as a change means.

Claims (4)

[Claims] (1) Current position detection means for detecting the current position of the vehicle;
a storage means that stores map data for displaying a road map; a road map based on the map data from the storage means is displayed; and a current position detected by the current position detection means is added to the road map. In the in-vehicle navigator, the storage means stores first map data for displaying a specific road map and first scale data indicating a scale of the road map. , stores second map data of a road map having a different scale with respect to the specific road map, and second scale data indicating the scale of the road map, and stores the second map data of the road map having a different scale with respect to the specific road map, and stores the second map data of the road map having a different scale with respect to the specific road map, and the second scale data indicating the scale of the road map, and the second map data indicating the scale of the road map. changing means for generating a change instruction for displaying a road map with a different scale for the map; reading first map data from the storage means to display a specific road map on the display means; map display control means for reading out second map data from the storage means and switching displaying road maps of different scales on the display means in accordance with a change instruction from the change means; and switching display of road maps by the map display control means. In-vehicle equipment comprising: current position correction means for correcting and displaying the current position displayed on the display means based on at least the second scale data stored in the storage means and the first scale data. Navigator for. (2) The storage means stores, for each region obtained by dividing the road map into a plurality of regions, a map number indicating the number of the region, map data of the road map in the region, and scale data of the road map in the region. , coordinate data indicating the position of the area relative to a reference point in coordinates, and a map number of an area having a different scale with respect to the area, and the map display control means stores the coordinate data indicating the position of the area in coordinates with respect to the reference point, and the map display control means stores the coordinate data indicating the position of the area with respect to the reference point in coordinates, and the map number of the area with a different scale with respect to the area, and the map display control means In response to an instruction, map numbers of areas with different scales stored in the storage means are used to read map data stored in correspondence with the map numbers from the storage means, and display road maps with different scales on the display means. When the map display control means switches and displays the current position, the current position correcting means selects scale data and coordinate data stored in the storage means corresponding to map numbers of areas with different scales, and displays the switching display. The in-vehicle navigator according to claim 1, wherein the current position displayed on the display means is corrected and displayed by performing coordinate transformation using scale data and coordinate data for a previous display area. . (3) The storage means stores a map number of an enlarged area with a larger scale than that area and a map number of a reduced area with a smaller scale than that area, as map numbers of areas with different scales for that area. and the changing means includes expanding,
The map display control means generates a change instruction for reduction, and the map display control means responds to a change instruction for either enlargement or reduction from the change means to correspond to a map number of an enlarged area or a reduced area according to the change instruction. 3. The in-vehicle navigator according to claim 2, wherein map data is read from the storage means and the area is displayed on the display means. (4) The storage means stores a plurality of map numbers of enlarged regions that are enlarged for each region obtained by dividing the region into a plurality of regions, as map numbers of enlarged regions whose scale is larger than that of the region, and the map The display control means selects a map number of an enlarged area of the area in which the current position display is located from among the plurality of divided areas when an enlargement instruction is issued from the changing means;
4. The in-vehicle navigator according to claim 3, wherein the map data of the selected map number is read from the storage means and the road map of the enlarged area is displayed on the display means.