JPH0731065B2 - Vehicle navigation system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle navigation device that displays a current position of a vehicle traveling on a road map.

Conventionally, as a device of this type, a distance sensor that detects a traveling distance of a vehicle and a direction sensor that detects a traveling direction of the vehicle are provided, and the current position of the vehicle is calculated based on signals from both sensors, and CR of calculated current position of vehicle
There is a device in which the current position is displayed on a road map by displaying it on the display surface of the T display device and further placing a map sheet on which a map of the traveling area is drawn on the display surface.

However, since this one merely displays the current position on the road map, there is a problem that it is of no use when searching for a search target point such as a gas station or a coffee shop in the traveling area.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a navigation device for a vehicle that can provide guidance for reaching a search target point even in an unguided area.

[Means for achieving the task]

In order to achieve the above object, a vehicle navigation device according to the present invention comprises a current position detecting means for detecting a current position of a vehicle, and a display means for displaying the current position detected by the current position detecting means on a road map. In a vehicular navigation device including: a storage unit that pre-stores coordinate data of existing points of a plurality of buildings of the same type existing in the area of the road map; and an instruction unit that issues a mark display instruction by an external operation. When a mark display instruction is issued from this instruction means, based on the coordinate data of the existing points of a plurality of buildings stored in the storage means, the display means is set at the position on the road map of the display means corresponding to the coordinate data. Display control means for displaying a mark indicating a building, and a positional relationship between the current position displayed on the display means and the mark display position. Is characterized in that the approaching state to the buildings being the mark display and means to inform the driver of the vehicle.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is an overall configuration diagram showing an embodiment thereof. In FIG. 1, reference numeral 1 denotes an azimuth detection position as azimuth detection means, which is an azimuth sensor for detecting the X and Y components of the geomagnetism according to the traveling azimuth of the vehicle and a signal from this azimuth sensor is converted into a digital signal. Equipped with an A / D converter, depending on the traveling direction of the vehicle
It generates digital signals of X and Y components. Reference numeral 2 is a distance sensor as a distance detecting means, which generates a distance pulse for each unit traveling distance (about 39.2 cm) of the vehicle.
Reference numeral 3 is a reading device, which searches for map data of a specific area among them by using a set of cassette tapes 3a storing a plurality of map data (including absolute coordinate data of the upper right point of each map) It also reads the coordinate data of multiple GS points in a specific area. Reference numeral 4 denotes a GS instruction switch as an instruction means for instructing a search for a gas station (GS), which uses a push-lock type switch and generates a GS instruction signal when the switch is turned on.

Reference numeral 5 is a microcomputer that executes digital arithmetic processing of software according to a predetermined control program, and includes a CRU4a, ROM4b, RAM4c, I / O circuit section 4d, clock generating section, etc. It receives power from a vehicle-mounted battery and generates a stabilized voltage of 5V. It receives a stabilized voltage from a stabilized power supply circuit (not shown) and is activated. Y
A function (calculation means) for calculating the current position by receiving the component digital signal and the distance pulse from the distance sensor 2, and a display signal for displaying a road map and a traveling route by receiving the read signal from the reading device 3. A function for generating (a display control means is configured together with a CRT controller 7 described later)
When a GS indication signal is generated from the GS display switch 4, the coordinate data of a plurality of GS points read from the reading device 3 and the coordinate data of the calculated current position are sequentially compared, and the current position is at least one GS point. Predetermined distance (eg 100m)
It has a function (searching means) for generating a voice command signal for generating a voice to that effect when it is determined that the number of times has reached. The RAM4C is always backed up by the on-board battery.

Reference numeral 7 is a CRT controller, which receives a display signal from the microcomputer 5 to individually store map data of a specific area, traveling route information and character data, and
It generates a video signal and a sync signal for displaying the stored map data and traveling route information or character data on a CRT. 8 is CR as display means
The T display device displays the map and traveling route of a specific area on the CRT by a video signal and a synchronization signal from the CRT controller 7. Reference numeral 9 denotes a touch panel unit, which is attached on the display surface of the CRT display device 8 and generates a serial signal corresponding to a specific touch area of the 12-divided touch areas provided on the touch panel when the touch operation is performed. It is a thing. Reference numeral 10 denotes a voice synthesizing circuit, which receives a voice command signal from the microcomputer 5 to synthesize a voice approaching the GS point and causes the speaker 11 to generate a voice in the vehicle interior. Then, the voice synthesizing circuit 10 and the speaker 11 constitute an informing means.

Next, a detailed electrical connection diagram of the CRT controller 7 shown in FIG. 2 will be described. 11 is an oscillation circuit that generates an oscillation signal of 12.096 MHz, 12 is a dot counter that divides the oscillation signal from the oscillation circuit 11 and generates a dot timing clock of 6.048 MHz and a character timing clock of 756 KHz, and 13 is a microcomputer 5 A display controller that generates horizontal and vertical synchronization signals, display timing signals, refresh memory address signals, and raster address signals in accordance with the command from (1) and the character timing clock from the dot counter 12, 14 is a horizontal or vertical display controller 13. This is a hold signal generation circuit that generates a hold signal for holding the microcomputer 5 during the display period based on the synchronization signal at the hold (HOLD) terminal of the microcomputer 5. 15 is a multiplexer for switching the address signal from the microcomputer 5, the refresh memory address signal from the display controller 13, and the raster address signal by the hold acknowledge (HOLDA) signal from the microcomputer 5, 16, 17 and 18 are displayed as the microcomputer 5. A bus driver having a tri-state for switching the direction of data between the memories, 19 stores display data such as ASCII code from the microcomputer 5, and receives a refresh memory address signal from the display controller 13 to address its contents. And a character generator 20 for outputting a display pattern according to the display address from the character memory 19 and the raster address signal from the display controller 13.
Reference numeral 21 is a first graphic memory for storing map data from the microcomputer 5, 22 is a second graphic memory for storing traveling route information (travel locus data, current position data) from the microcomputer 5, 23, 24, twenty five
Is a dot counter 12 that receives parallel signals from the character generator 20 and the first and second graphic memories 21 and 22.
A parallel-> serial (P-> S) converter for converting serial data with a dot timing clock from, and 26 is a P-> S converter for selecting a graphic and character screen by a screen switching signal from the microcomputer 5.
And a P-to-S converter 24, 25 switching the reception of signals from the display controller 13, a video controller for producing a video signal by a display timing signal, 27 is a display controller
This is an exclusive OR circuit that produces sync signals from horizontal and vertical sync signals from 13. The character memory 19 and the first and second graphic memories 21 and 22 are always backed up by an on-vehicle battery.

That is, in the CRT controller 7, the character data is stored in the character memory 19, the map data is stored in the first graphic memory 21, and the traveling locus and the display data of the current position are displayed in the second graphic according to the data transmitted from the microcomputer 5. A memory which is constantly stored in the memory 22 and which displays a graphic memory screen (displaying a running locus and a current position on a map) and a character screen (displaying designated characters for designating a district) by a screen switching signal from the microcomputer 5. ) And select the screen corresponding to the selection.
A video signal and a sync signal for CRT display are generated in the CRT display device 6.

In addition, the touch panel unit 9 has a structure as shown in FIG.
It has 12 divided touch areas up to 42 and 2
It consists of a sheet of glass and transparent conductive films formed in a matrix on each glass, and when a specific touch area is pressed, the touch area is detected by the contact of the transparent conductive film of the matrix due to the bending of the glass. A serial signal (consisting of a start signal and a touch information signal) corresponding to a touch area detected by a touch signal generation circuit (not shown) is generated. The touch signal generation circuit generates touch information at that time by a serial signal every 40 msec.

Further, FIG. 4 shows a data area portion corresponding to one area on the cassette tape 3a, in which A stores the map number and the absolute coordinate (coordinate with respect to the north pole) data of the upper right point of the map of the area. The header section, B is the map data storage section that stores the map data of the area, and C is the coordinate data of multiple GS points in the area.
GS point storage section, X is a blank section. Therefore, this A,
By reading the B and C parts by the reading device 3, the microcomputer 5 can be provided with the map number of the specific area, the map data, the absolute coordinate data, and the coordinate data of a plurality of GS points.

The operation of the above structure will be described with reference to the display explanatory view of FIG. 5 and the operation flow charts shown in FIGS. 6 to 11.

Now, in a vehicle equipped with the components 1 to 11 shown in FIG. 1, when the key switch is turned on at the start of its operation, the electric system of each part is activated by receiving the power supply from the on-vehicle battery. And in the microcomputer 5,
Upon receiving the supply of the regulated voltage of 5V from the regulated power supply circuit, it becomes the operating state, the arithmetic processing is started from the start step 100 in FIG. 6, and the routine proceeds to the initial setting routine 200 to register in the microcomputer 5, Set counters, latches, etc. to the initial state required to start arithmetic processing. This initial setting includes a distance flag, a flashing flag reset, a GS first time flag, an instruction first time flag set operation, and the like, which will be described later. Then, after this initialization, the calculation processing of the mode calculation routine 300, the current position calculation routine 400, and the GS instruction calculation routine 500 is repeatedly executed at a cycle of several tens msec to several hundreds msec.

That is, in this mode calculation routine 300, either the map mode or the character mode is selected, and the contents are displayed on the CRT according to the mode. In the map mode, the cursor indicating the current position can be moved, and the character mode At the time of, the arithmetic processing which enables the map designation of the specific area is executed, and the routine proceeds to the current position arithmetic routine 400. This current position calculation routine 400 executes a calculation process for changing the contents of the current position data and the traveling locus data in the second graphic memory 22 in the CRT computer 5 for each X and Y component by a travel change of ± 50 m. , GS instruction calculation routine 500. In this GS instruction calculation routine 500, when the GS point search instruction is issued, the coordinate data of a plurality of GS points in the traveling area are compared with the coordinate data of the current position, and the current position falls within the predetermined distance range of at least one GS point. If it is determined, a voice command signal for generating a voice to that effect is generated, and further calculation processing for blinking the GS point on the CRT display is executed, and the processing returns to the mode calculation routine 300.
Thereafter, the arithmetic processing of the main routine from the mode arithmetic routine 300 to the GS instruction arithmetic routine 500 is repeatedly executed at a cycle of several tens msec to several hundreds msec.

When the distance pulse from the distance sensor 2 is applied to the interrupt (INT) terminal of the microcomputer 5 for the repeated calculation of this main routine, the microcomputer 5 suspends the calculation processing of the main routine. The interrupt calculation process shown in FIG. 7 is executed. That is, the arithmetic processing from the interrupt start step 701 is started, and the procedure proceeds to step 702, where the unit distance data (corresponding to about 39.2 cm) is integrated and updated to the distance data D stored in the RAM 4C, and step 703.
Then, it is determined whether or not the distance data D has reached 6.25 m. At this time, if the distance data D has not reached 6.25 m, the determination is NO and the routine proceeds to the return step 701,
When the distance data D reaches 6.25m, the judgment becomes YES,
Go to step 704. Then, in this step 704, digital X, Y component signals Xa, Ya from the azimuth detection position 1 (east,
Enter north for positive direction, west and south for negative direction), and then step 705
Go to step 706 to obtain average direction data X, Y from the previous direction data Xo, Yo (direction data before traveling 6.25 m) and current direction data Xa, Ya, and proceed to step 706 to calculate the distance component in the X direction.
Dx The distance component Dy in the Y direction Asked as Is cos with respect to the counterclockwise angle with respect to the east direction Proceeding to step 707, the present direction data Xa, Ya is stored as Xo, Yo for the next time, proceeding to step 708 to reset the distance data D to 0, proceeding to step 709, setting the distance flag, and returning. The process proceeds to step 710 to return to the main routine that was temporarily suspended. That is, in this interrupt calculation routine, the distance data D is cumulatively updated every time the vehicle travels a unit distance, and when the distance data D reaches 6.25 m, this
The distance components Dx and Dy in the X and Y directions with respect to 6.25 m are calculated, and the calculation processing for setting the distance flag is executed.

Next, the mode calculation routine 300 in the main routine
The detailed calculation processing of will be described. In this mode calculation routine 300, the calculation process is started from step 301 in FIG. 8, touch data from the touch panel unit 9 is input and stored in the RAM 4C. Then, proceed to step 302 and RAM4
It is determined whether or not the contents of the mode area in C is the map mode. When the mode is the map mode, the determination is YES, the process proceeds to step 303 and the touch data stored in the RAM 4C is the data indicating the mode change ( It is determined whether or not the touch area 34 in FIG. 3 is the data when the touch area is pressed. At this time, if the touch data is data indicating a mode change, the determination becomes YES, the process proceeds to step 304, and the content of the mode area is set to the character mode,
Proceeding to step 305, a character switching signal for causing the CRT display device 6 to display a character screen is generated in the video controller 26 in the CRT controller 5, and the one-time arithmetic processing of the mode arithmetic 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, FF data). ), The determination in step 303 is NO, and step 306
Proceed to. In this step 306, the touch data is 32,
It is determined whether or not the touch area of any of 33, 35, 38, 40, 41 is the data when the touch area was pressed (data of cursor movement). If the touch data is not the data of cursor movement, the determination is NO. Then, the one-time arithmetic processing of the mode arithmetic routine 300 ends, but if the touch data is data of cursor movement, the determination becomes YES and the routine proceeds to step 307. In this step 307, according to the touch data,
If the touch data is data for pressing the 32 or 33 touch area, the cursor (8a in FIG. 1) at the current position displayed on the CRT display device 6 is moved in the north direction by a predetermined distance. The contents of the second graphic memory 22 in the CRT controller 5 are changed. Similarly, when the touch data is data for pressing the touch area of 35, the cursor is directed in the west direction, and when touch data of the touch area of 40 or 41 is pressed. Arithmetic processing for changing the contents of the second graphic memory 22 so as to move the cursor in the south direction when it is data and in the east direction when the touch data is data for pressing the touch area 38 Is executed, and one-time arithmetic processing of the mode arithmetic routine 300 is completed.

On the other hand, when the determination in step 302 is NO, the process proceeds to step 308, and it is determined by the same calculation process as in step 303 whether the mode is changed. At this time, if the determination is YES at the time of changing the mode, the process proceeds to step 309 to set the contents of the mode area in RAM4C to the map mode, and the process proceeds to step 310 to run the second graphic memory 22 in the CRT controller 5. Convert route data. In this case, first, the reader 3 is controlled to search the designated area by the map number, and the absolute coordinate data (stored in the header portion A shown in FIG. 4) on the searched map and the absolute coordinate data on the previous map are used. The coordinate conversion value is calculated, and the traveling locus and the current position data in the second graphic memory 22 are converted to slide according to the calculated value (the traveling locus and the current position data stored in the RAM4C are similarly converted. Convert. Then, in step 311, the map data of the cassette tape 3a is input through the reading device 3 and the map data is output to the first graphic memory 21, and in step 312, the GS point storage section of the cassette tape 3a is input. Read coordinate data of multiple GS points from C and RAM4C
In step 313, a map switching signal for causing the CRT display device 6 to display the graphic screen of the map is generated in the video controller 26, and this mode calculation routine is executed.
One calculation process of 300 is completed. That is, when switching from the character screen to the graphic screen of a map different from the previous time, the above-described arithmetic processing is executed to store the map data of this time in the first graphic memory 21 and the traveling locus and the current position corresponding to this map are displayed. The contents in the second graphic memory 22 are converted so that the cursor indicating the current position is corrected (the data of the traveling locus and the current position in the RAM 4C are also converted). This allows the CRT display device 6
Even if the map displayed on the screen is switched, the traveling locus and the current position can be displayed on the portion corresponding to the map.

On the other hand, when the determination in step 308 is NO, the process proceeds to character calculation step 314. When this step 314 is reached, the character mode is set and the character switching signal is being issued to the video controller 26, so the CRT display device 6 displays the character screen as shown in FIG. is doing. The number 02-4-68 shown in the center of this character screen is a number for designating a local area and a regional area, respectively.
In the character calculation step 313, the value is incremented by 1 and updated by 1, the decrement switch 52 subtracts and updates by 1, the set switch 53 sets and the reset switch 54 resets. The numerical data of the regions, areas, and districts, that is, the map numbers are stored in the RAM4C. In addition, the switch 51,
52, 53, 54 are touch areas 39, 40, 41, 42 of FIG. 3, respectively.
It corresponds to.

That is, in the mode calculation routine 300 shown in FIG. 8, the following operations 1 to 3 are performed according to the contents of the mode area in the touch data RAM 4C from the touch panel section 9.

If there is a cursor movement instruction in the map mode and the mode is not changed, arithmetic processing for cursor movement is executed, and if there is no cursor movement instruction, map display is continued.

When a mode change instruction is issued in the map mode, the map mode is changed to the character mode and the CRT display device 6 is caused to display the character screen.

No. 5 when in character mode but not mode change
Map changes can be accepted for the character screen as shown.

If there is an instruction to change the mode while in character mode, the character mode will be changed to map mode.
Display the graphic screen of the map on the CRT display device 6,
At the same time, the traveling locus and the current position are also corrected and displayed.

Next, detailed calculation processing of the current position calculation routine 400 will be described. In the present position calculation routine 400, the calculation processing is started from step 401 in FIG. 9, and it is determined whether or not the distance flag is set in the interrupt calculation processing in FIG. At this time, if the distance flag is not set, the determination is NO and this current position calculation routine 400
However, if the distance flag is set, the determination is YES, and the routine proceeds to step 402. Then, in step 402, the X distance data DX is corrected and calculated by the X distance component Dx obtained by the interrupt calculation processing (DX = DX
+ Dx), the Y distance data DY is similarly corrected and calculated (DY = DY + Dy) at step 403, and the routine proceeds to step 404, where it is determined whether or not the X distance data DX has reached a value of 50 m or more. At this time, if the X distance data DX has a value of 50 m or more, the determination is YES, the process proceeds to step 405, the value of 50 m is subtracted from the X distance data DX, the process proceeds to step 406, and the second graphic memory 22 The current position data inside is moved by 50 m (corresponding to one pixel on the screen) in the forward direction (east direction), and the traveling locus data is also tracked to follow this.
Move the current position data in M4C by 50m in the forward direction (east direction).

When the determination in step 404 is NO, the process proceeds to the second X distance determination step 407, and it is determined whether or not the X distance data X has become a value of -50 m or less. At this time, X distance data
If DX is a value of -50 m or less, the determination is YES, the process proceeds to step 408, the value of 50 m is added to the X distance data DX, and the process proceeds to step 409, where the current position data in the second graphic memory 22 is stored. Is moved in the negative direction (westward) by 50 m, and the mileage data is tracked accordingly, and the current position data in RAM4C is moved in the negative direction (westward) by 50 m.

When the determination in step 407 is NO, or 40
After 6,409, the process proceeds to the Y component display movement processing routine 410, and the same determination and calculation processing as in steps 404 to 409 is executed for the Y distance data DY calculated in step 403.
(When the Y distance data DY reaches a value of 50m or more in either positive or negative direction, the current position data and traveling locus data in the second graphic memory 22 are moved in the corresponding direction by 50m, and the current position data of RAM4C Is moved in the corresponding direction by 50 m.) Then, the process proceeds to the next step 411 to reset the distance flag.

That is, in the current position routine 400 shown in FIG. 9, the current position data in the second graphic memory 22 regardless of the screen displayed on the CRT display device 6, and
Converts the current position data in RAM4C.

Therefore, the mode calculation routine 300 and the position calculation routine 400
The current position data and the traveling locus data in the second graphic memory 22 are sequentially changed by the repeated calculation of the main routine by the CPU and the interrupt calculation of FIG. 7, and the CRT display device 6 is operated in accordance with the designated mode. Select the screen of, and in the map mode, display the graphic screen of the map (including the display of the current position and the traveling path),
In the character mode, the character screen for map designation shown in FIG. 5 is displayed.

Next, detailed calculation processing of the GS instruction calculation routine 500 will be described. In this GS instruction calculation routine 500, the calculation processing is started from step 501 in FIG. 10, and it is determined whether or not the GS instruction signal is generated from the GS instruction switch 4 by turning it on. At this time, if the GS instruction signal is not generated, the determination is NO, and the routine proceeds to step 501a, where it is determined whether or not the GS first time flag is set. At this time, since the GS1st flag is set in the initial setting, the determination is YES, the process proceeds to step 502, the GS1st flag is set, and one calculation process of this GS instruction calculation routine ends, GS instruction switch 4 to refuel
Is turned on, and when the GS instruction signal is generated from the GS instruction switch 4, the determination is YES. Then, the routine proceeds to step 503, where it is judged whether or not the GS first time flag is set. Since the GS first time flag is set at the first arrival, the judgment is YES, and the routine proceeds to step 504. In this step 504, each GS point is first set by the coordinate data of each of the plurality of GS points stored in the RAM 4C.
The display data for each X mark display is created so as to be displayed by the plurality of X marks shown in the CRT display device 8 in the figure, and then the process proceeds to step 505 to output the display data to the second graphic memory 22. Then, the process proceeds to step 506, the GS first flag is reset, and the process proceeds to step 507. Note that G
When the step S503 is reached next time by resetting the S1 flag, the determination is NO, and the process proceeds to the step 507.

In step 507, the coordinate data (X, Y) of the current position stored in the RAM 4C and the coordinate data (X (i), Y (i) of each of the plurality of GS points are set, where the GS point is N.
If there is a distance Q (i) between i = 1 to N) However, it is determined by the calculation formula of i = 1 to N, and the process proceeds to step 508 to determine whether at least one of the determined distances to the GS points is a value of 100 m or less. At this time, there is no GS near this vehicle
If NO, the routine proceeds to step 509, where it is determined whether or not the blinking flag is set. At the first arrival, since the blinking flag remains reset by the initial setting, the determination becomes NO, and the one-time arithmetic processing of the GS instruction arithmetic routine 500 is ended. After that, the above arithmetic processing is repeatedly executed until this vehicle approaches any GS.

After that, when the traveling of this vehicle progresses and approaches any GS, and the distance to the GS point calculated in step 507 becomes a value of 100 m or less, the determination in step 508 becomes YES, and step 514 follows. move on. In this step 514, it is determined whether or not the first instruction flag is set. However, the determination is YES because the first instruction flag is set in the initial setting. Then, proceeding to step 515, the coordinate data of the approaching GS point is stored in a predetermined area of the RAM 4C, and proceeding to step 516, a voice command signal for notifying the approaching GS is generated in the voice synthesis circuit 10, and step 517.
Proceed to and reset the first instruction flag, and step 518
Proceed to and set the display flag to be described later, and step 51
In step 520, the blinking flag is set, and in step 520, the timer data T for blinking the display is reset to zero.
Then, the voice synthesizing circuit 10 synthesizes the voice in accordance with the voice command signal, and the speaker 11 produces the voice of "gas station setting" in the passenger compartment.

Then, the process proceeds to a blink calculation routine 600, and a calculation process for blinking the X mark display at the approaching GS point is executed every 0.5 seconds.
Note that when the next step 514 is reached, the first instruction flag has been reset, so the determination is NO, and the routine proceeds to the blink calculation routine 600. The detailed calculation processing of this blink calculation routine 600 is shown in FIG. First, in step 601, the timer data T is 0.5.
It is determined whether the value in seconds has been reached. At the first arrival, since the timer data T has been reset to 0 in the previous step 520, the judgment is NO, and the routine proceeds to step 602, where 1 is subtracted from the timer data T to update it. After that, until the timer data T reaches the value of 0.5 seconds, when the blink calculation routine 600 is reached, the above calculation processing is repeatedly executed.

After that, 0.5 second elapses and the determination in step 601 is YE.
When S is reached, the routine proceeds to step 603, where it is determined whether or not the in-display flag is set. At the first arrival, since the display flag is set in the previous step 518, the determination is YES, and the process proceeds to step 604, and the coordinate data of the approaching GS point stored in the previous step 515 is read out. The display data stored in the second graphic memory 22 is erased in order to erase the X-mark display displayed corresponding to the coordinate data, and the process proceeds to step 605 to reset the in-display flag, In step 609, the timer data T is reset to 0. Therefore, when the next step 601 is reached, the determination is NO, and the process returns to the step 602.

After that, 0.5 second elapses and the determination in step 601 is YE.
When S is reached and when it reaches step 603, the determination is NO because the display flag is reset. Then, the procedure proceeds to step 606, where the coordinate data of the approaching GS point stored in the RAM 4C is read out, and the display data for displaying the GS point as an X mark is created by the coordinate data. 2 is output to the graphic memory 22 and the process proceeds to step 608 to set the display flag, and the process proceeds to step 609 to reset the timer data T to zero.

After that, by repeating the above operation, the GS point near the current position displayed by the X mark on the CRT display device 8 blinks.

After that, if the fuel is replenished with the GS and the GS instruction switch 4 is released, the judgment is N when step 501 is reached.
Become O. Then, the routine proceeds to step 501a, where the determination is NO because the GS first flag has been reset, and the routine proceeds to step 501b, where the coordinate data of a plurality of GS points is read out and the second graphic memory 22 corresponding thereto is read. All the data for displaying the X mark stored therein is erased, and the routine proceeds to step 502, where the GS first flag is set. As a result, all X marks in the CRT display device 8 are erased. When the next step 501a arrives, the judgment is YES.
Then, the process directly proceeds to step 502.

While the GS spot is blinking, if the vehicle has passed the GS spot and the distance to the GS spot becomes a value larger than 100 m and the determination in step 508 becomes NO, step 509
Proceed to. Then, in step 509, it is determined whether or not the blinking flag is set, and since the blinking flag is set in the previous step 519, the determination becomes YES, and the process proceeds to steps 510 and 511 and the steps 606 and 607. The same calculation process is performed (the display of the X mark which has been blinked until then is brought into the display state), the process proceeds to step 512 to reset the blinking flag, and the process proceeds to step 513 to set the first instruction flag. Therefore, when the blinking flag is reset, the determination will be NO when the next step 509 is reached. As a result, the X-mark display, which had been blinking until then, is changed to a lighting display, and the arithmetic processing for the GS instruction is performed again.

In the above embodiment, the search target point is the GS point, but it may be a point such as a coffee shop, a station, a service station, or the like.

Further, although the cassette tape 3a is used as the storage means, a magnetic disk, a semiconductor memory or the like may be used.

Further, although the instruction input means that the instruction input is made by the switch is shown, the instruction input may be made by the voice recognition.

Further, although the CRT display device 8 is used as the display means, a display device using liquid crystal, EL or the like may be used.

Further, although the one using the microcomputer 5 as the control means is shown, one having a hard logic structure by an electronic circuit may be used.

Furthermore, although the one using voice as the notification means is shown,
The notification may be made using a buzzer or the like or may be made only by displaying.

The CRT display device 8 corresponds to the display means when the correspondence relationship between the above-described embodiment and the configurations described in the claims is collectively shown, and the coordinate data of the current position ( The part that obtains (X, Y) corresponds to the current position detecting means. In addition, coordinate data (X
The RAM 4C storing (i), Y (i)) corresponds to the storage means, and the GS instruction switch 4 corresponds to the instruction means. Furthermore, by turning on the GS instruction switch 4, CRTs can be performed at multiple GS points.
The processing portion such as steps 504 and 505 in FIG. 10 displayed on the display device 8 corresponds to the display control means. The x mark indicating the GS point corresponds to the mark display of the building. In addition,
10 Steps 507, 508, 514 to 520, blinking calculation routine
Reference numeral 600 corresponds to a means for informing the driver of the vehicle of the approaching state to the marked building.

〔The invention's effect〕

As described above, according to the present invention, the mark indicating the building is displayed on the road map by operating the indicating means, so that when searching for a building such as a gas station in an unfamiliar area. By displaying the mark of the building, it is possible to easily reach the building. Furthermore, the positional relationship between the current position and the mark display position is used to notify the driver of the vehicle of the approaching state to the marked structure, so it is more appropriate to provide guidance for reaching the target structure. Can be done.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a detailed electrical connection diagram of the CRT controller in FIG. 1, FIG. 3 is an explanatory diagram showing a touch area of a touch panel portion, and FIG. Is an explanatory view showing the data area of the cassette tape, and FIG. 5 is
A display explanatory diagram showing a display state of the CRT display device, and FIGS. 6 to 11 are calculation flowcharts showing calculation processing of the microcomputer in FIG. 1 ... Direction detection device, 2 ... Distance sensor, 3 ... Reading device, 3a ... Cassette tape, 4 ... GS instruction switch, 5
...... Microcomputer, 8 …… CRT display device, 10 ...
… Speech synthesizer, 11 …… Speaker.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyuki Teraura 1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. (56) References JP 57-3199 (JP, A) JP 58 -70117 (JP, A) JP-A-58-210512 (JP, A)

Claims (3)

[Claims] 1. A vehicle navigation device comprising a current position detecting means for detecting a current position of a vehicle and a display means for displaying the current position detected by the current position detecting means on a road map, When the mark display instruction is generated from the storage unit that stores in advance the coordinate data of the existence points of the same type of buildings existing in the map area, the instruction unit that issues the mark display instruction by the external operation, Display control means for displaying a mark indicating the building at a position on the road map of the display means corresponding to the coordinate data based on the coordinate data of the existing points of the plurality of buildings stored in the storage means According to the positional relationship between the current position displayed on the display means and the mark display position, the state of approach to the building displayed with the mark is displayed on the vehicle. A vehicle navigation device including means for informing a driver. 2. The vehicle navigation apparatus according to claim 1, wherein the means for notifying the approaching state is a means for blinking the mark display. 3. The vehicular navigation device according to claim 1, wherein the means for notifying the approaching state is means for notifying the approaching state by voice.