JPH0883398A - Navigation system - Google Patents

Abstract

PURPOSE: To display an image such as information data excepting for a map on a display screen by displaying the image excepting for the map on the display screen in a running state in which it is not necessary to display the position of an automobile on the map. CONSTITUTION: When the vehicle is involved in a traffic jam or parked or the state of unnecessitating the display of the automobile position such as not only a GPS non-measuring state but also the state of running on one road such as a highway is provided while the map image is displayed, a plotting enable part 6i turns an auxiliary image plotting enable signal DIN to a high level. Thus, a map plotting control part 6f reads auxiliary image information (such as screen saver information or sightseeing guide information, for example), from an auxiliary image information generating part 6i and inputs it to a display device 7. The display device 7 displays the screen saver image or the sightseeing guide image on a display screen 11 in place of the map image while using the auxiliary image information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device, and more particularly, in a traveling state in which it is not necessary to display the position of a vehicle on a map (for example, during traffic jam, parking, one-way traveling on highways, etc.), The present invention relates to a navigation device that displays an image other than a map on a display screen.

[0002]

2. Description of the Related Art A navigation system reads map data corresponding to the current position of a vehicle from a map data storage unit such as a CD-ROM and draws it on a display screen.
The vehicle position mark is moved on the map, or the vehicle position mark is fixedly displayed at a fixed position on the display screen (for example, the center position of the display screen), and the map is scrolled according to the movement of the vehicle. As shown in FIG. 7, the map data includes (1) a road layer L _R composed of node data, road link data, intersection data, etc., and (2) a background layer L _B for displaying objects on the map. (3) Character layer L _C for displaying the name of city, etc., and (4) Service information (for example, IIS data: Integrated Information S
service data) for providing the service layer L _S. The map image displayed on the display screen is generated based on the background layer and the character layer, and the map matching process and the guidance route search process are performed based on the road layer. In addition, tourist information guides (famous places, names, hotels, golf courses, ski resorts, etc.), highway information guides (parking area PA, service area SA, highway charges), access information (airport, Shinkansen station, ferry wharf information), JA
Images of contact information such as F and road traffic information center are generated based on the service area.

In such a navigation system, it is essential to measure the current position of the vehicle. For this reason,
Measurement method (self-contained navigation) to measure vehicle position using distance sensor and angle sensor mounted on vehicle and GPS using satellite
The measurement method (satellite navigation) has been put to practical use. The vehicle position measurement by self-contained navigation can measure the vehicle position at a relatively low cost, but there is a problem that the position measurement cannot be performed with high accuracy, and correction processing such as map matching processing is required.
In addition, while satellite navigation can detect an absolute position, it has a drawback that the position cannot be detected in a place where satellite radio waves are blocked, such as a tunnel or a building.

In a self-contained navigation device,
The vehicle position is detected as follows by integration based on the outputs of the distance sensor and the angle sensor. FIG. 8 is an explanatory diagram of a vehicle position detection method by self-contained navigation. The distance sensor outputs a pulse each time the vehicle travels a certain unit distance L ₀ , and the reference azimuth (θ = 0) is set on the X axis. The positive direction is the positive direction, which is the counterclockwise direction from the reference direction. The previous vehicle position is the point P ₀ (X ₀ , Y ₀ ), and the traveling direction of the vehicle at the point P ₀ is θ.
₀ , unit distance L ₀ The output of the angle sensor at the time of traveling is Δ
If it is θ ₁ , the change amount of the vehicle position is ΔX = L ₀ · cos (θ ₀ + Δθ ₁ ) ΔY = L ₀ · sin (θ ₀ + Δθ ₁ ), and the traveling direction θ at this point P _{1 1} and position (X ₁ ,
Y ₁ ) is given as θ ₁ = θ ₀ + Δθ ₁ (1) X ₁ = X ₀ + ΔX = X ₀ + L ₀ · cos θ ₁ (2) Y ₁ = Y ₀ + ΔY = Y ₀ + L ₀ · sin θ ₁ (3) It can be calculated by vector composition.

Therefore, if the angle (offset angle) between the actual traveling azimuth of the vehicle at the start point and the reference azimuth is given, the offset angle is added to the traveling azimuth (called sensor azimuth) obtained by the equation (1). As a result, the actual traveling direction of the vehicle, that is, the absolute traveling direction can be obtained. Further, if the current position of the vehicle at the start point is given, the vehicle position can be detected in real time by the equations (2) and (3), and the vehicle position mark and the traveling locus can be displayed on the road. In such self-contained navigation, errors accumulate and the vehicle position deviates from the road as the vehicle travels. Therefore, the vehicle position is checked against the road data by the map matching process and corrected on the road. Various map matching methods have been proposed. In the first map matching method, a traveling locus (position and direction for each predetermined traveling distance) is stored, a road on the map having the same shape as the traveling locus is obtained, and a vehicle position mark is mapped to a point on the road. This is a matching method (pattern matching).

The second map matching method is the projection method.
Method. FIG. 9 shows map matching by the projection method.
FIG. Vehicle position is point P_i-1(X_i-1, Y_i-1) To
Yes, vehicle direction is θ_i-1It was. Point P_i-1One more
Constant distance L₀The relative azimuth when traveling (for example, 5 m) is Δ
θ_iIf so, the point P of the vehicle position by self-contained navigation_i′
(X _i′, Y_i′) And P_iVehicle direction at ′_iIs the following equation θ_i= Θ_i-1+ Δθ_i  X_i′ = X_i-1+ L₀・ Cos θ_i  Y_i′ = Y_i-1+ L₀・ Sin θ_i Required by.

[0007] At this time, 'a link possible from the taking down perpendicular, point P _i' (a) point P _i heading theta _i in
And the angle formed by the link is within a certain value, and the length of the perpendicular line drawn from the point P _i ′ to the link is within a certain distance. Here, the link LKa ₁ (the straight line connecting the nodes Na ₀ and Na ₁ ) of the direction θa ₁ on the road RDa and the road RD
This is a link LKb ₁ (a straight line connecting the nodes Nb ₀ and Nb ₁ ) with the direction θb ₁ on b. Then, (b) link LKa from point P _i ′
_The lengths of the vertical lines RLia and RLib dropped to ₁ and LKb ₁ are obtained, and the shorter link is used as a matching candidate. Here, the link is LKa ₁ . (c) The traveling locus SHi connecting the points P _i-1 and P _i ′ is translated in the direction of the perpendicular line RLia until the point P _{i -1} is on the link LKa ₁ (or on the extension line of the link LKa ₁ ). The moving points PT _i-1 and P _{i of} the points P _i-1 and P _i ′.
T _i ′ is obtained, and (d) Finally, PT _i ′ is centered on the point PT _i−1.
Is moved on the link LKa ₁ (or on the extension of the link LKa ₁ ) to obtain the moving point, and the corrected vehicle position P _i
(X _i , Y _i ). The vehicle orientation at the corrected vehicle position P _i remains θ _i .

By the way, in the self-contained navigation, when the error becomes large and the vehicle position deviates greatly from the road, the vehicle position cannot be map-matched with the actual current position on the road. That is, the first map matching method makes it impossible to find a road having the same shape as the traveling locus, and the second method makes it impossible to find a road that satisfies the matching condition. When the map matching becomes impossible in this way, the navigation does not make sense, and the vehicle must be stopped and the vehicle position mark must be positioned at the actual vehicle position on the map to restart the navigation.
However, such a method has extremely poor operation performance. Therefore, if GPS is incorporated into a self-contained navigation system and map matching becomes impossible, the position of the vehicle and the direction data obtained from the GPS are used to map match the vehicle position with the current position of the vehicle, and the traveling direction of the vehicle. A fix has been made.

The correction of the traveling azimuth is carried out by correcting the GPS azimuth θgi at a plurality of points (n points) and a plurality of absolute traveling azimuths (θsi +) measured by the self-contained navigation at the same point.
θoff: θsi is the sensor azimuth and θoff is the average value of the difference from the offset angle θc = (1 / n) · Σ {θgi- (θsi + θoff)} (i = 1,2, ... n) The calculation is performed according to (4), and the offset angle θoff so far is corrected by the average value θc. That is, a new offset angle θoff is calculated by the following equation θoff + θc → θoff (5). After that,
Using this new offset angle θoff and the sensor azimuth θsi measured by self-contained navigation, the absolute traveling azimuth θai is calculated by the following equation θsi + θoff → θai (6). Although includes an error of about a maximum ± 15 ⁰ The GPS orientation, G (4) below
Since the ± error of the PS azimuth data cancels each other, the azimuth data can be corrected with high accuracy.

[0010]

As described above, in the conventional navigation device, the map corresponding to the vehicle position is displayed on the display screen, and the vehicle position mark is displayed on the traveling road. IIS information, information data) was not displayed unless the user accessed it from the operation unit. For this reason, various information is often used as dead information, which is not used at all.
On a straight road or a highway where there is no such thing, it was completely uninteresting that only a map was displayed.
Further, even during traffic jams, parking, etc., only the map is displayed, and there is a similar problem. From the above, the first object of the present invention is to display information data and the like other than a map in a traveling state where it is not necessary to display the vehicle position on the map (for example, during traffic jam, parking, one-way traveling on a highway, etc.). An object is to provide a navigation device that displays an image on a display screen. The second object of the present invention is to
It is an object of the present invention to provide a navigation device that automatically displays information data according to a vehicle position on a display screen.

[0011]

A first object of the present invention is to detect a traveling state in which it is not necessary to display the position of a vehicle on a map, a means for generating an image other than a map, and a vehicle on a map. This is achieved by a navigation device having means for displaying an image other than the map on the display screen when the vehicle is in a traveling state in which it is not necessary to display the position. The second purpose is to display the information data, measure the current position of the vehicle, and display the information data according to the current position of the vehicle when the display of the information data is instructed. And a means for displaying on a screen.

[0012]

[Function] Detects a traveling state (for example, traffic jam, parking, one-way traveling such as a highway, etc.) that does not require displaying the vehicle position on the map, and displays an image other than the map during such traveling state.
For example, a screen saver image (still image) or a tourist guide image near the vehicle position is displayed on the display screen. By doing so, various kinds of information can be utilized, and moreover, interesting display can be performed. When the display of the information data is instructed, the information data corresponding to the current position of the vehicle is
The S information is retrieved, and the retrieved information data is displayed on the display screen. If you do this, you can refer to various information without accessing.
The service provided by the car navigation device can be increased.

[0013]

【Example】

(a) First Embodiment of the Present Invention (a-1) Overall Configuration FIG. 1 is a configuration diagram of a navigation device according to a first embodiment of the present invention, in which 1 is a CD-RO for storing map information.
M is a control panel, 3 is a GPS receiver that receives radio waves from satellites to measure the current position of the vehicle, 4 is a multi-beam antenna that receives radio waves from each satellite, and 5 is a self-contained navigation sensor. Reference numeral 5a is a relative azimuth sensor (angle sensor) that detects the rotation angle of the vehicle such as a vibration gyro, 5b is a distance sensor that generates one pulse for each predetermined traveling distance, 6 is a map or vehicle position mark drawing process, map A display device 7 is a system controller having a microcomputer configuration that performs image drawing processing other than the above, optimum route search processing, map matching processing, and the like.

(A-2) Map information The map information is, as shown in FIG. 7, (1) Road layer L
_R , (2) a background layer L _B for displaying objects on a map, (3) a character layer L _C for displaying a city name, etc. (4) a service layer L _S for providing service information Composed of. Of these, the road layer includes road link data RLDT and node data N as shown in FIG.
It has DDT and intersection data CRDT. The road link data RLDT gives the attribute information of the corresponding road. The number of all nodes on the road link and each node that composes the road.
Data such as road number, road number (road name), road type (national road, expressway, other) and width. Further, the intersection data CRDT is a set of nodes (referred to as an intersection configuration node) closest to the intersection among nodes on a link connecting to the intersection for each intersection on the map. Is all the roads
It is a list of nodes, position information (longitude, latitude) for each node, an intersection identification flag for whether or not the node is an intersection, and if the node is an intersection, it points to the intersection data. If not, it is composed of a pointer or the like that points to the road link to which the node belongs.

(A-3) Operation panel The operation panel 2 is a key 2a for instructing to display an auxiliary image other than a map in a predetermined traveling state, a key 2b for instructing to display a tourist guide, and other keys such as a vehicle. A joystick for moving the position mark relative to the map, an angle correction key for setting an offset angle θoff, a map search key, an enlargement / reduction key, an optimum route search key, etc. (a-4) GPS Receiver Although not shown, the GPS receiver 3 converts the radio waves from each satellite received by the multi-beam antenna 4 into a predetermined intermediate frequency signal and amplifies each frequency conversion / amplifier. A receiver that selects and detects a channel signal assigned to GPS from radio waves from a satellite, a decoder that decodes the channel signal into digital data (time code data, etc.),
It has a processing unit. The processing unit performs three-dimensional positioning or two-dimensional positioning processing based on the decoded data to determine the vehicle position P.
i, azimuth θi, and vehicle speed are calculated and output in combination with positioning time Ti. The direction is the current vehicle position and 1 sampling time Δ
The vehicle speed is the direction connecting the vehicle positions before T, and the vehicle speed is the current vehicle position and the distance between the vehicle positions before one sampling time ΔT divided by the sampling time.

(A-5) System controller The system controller 6 includes a map data buffer memory 6a for temporarily storing map data, a map read control unit 6b, and a vehicle position Ps based on the self-contained navigation sensor output.
i, vehicle position / azimuth calculation unit 6 for calculating sensor azimuth θsi
c, a vehicle position correction unit 6d that corrects the vehicle position, a vehicle position mark generation unit 6e, map data around the vehicle position, and vehicle position mark data are input to the display device 7, and auxiliary image information other than the map is appropriately displayed. A map drawing control unit 6f input to the device 7, a non-positioning detection unit 6g that detects that positioning by GPS is impossible due to being blocked by a tunnel or a building, traffic jams (including stoppage) and parking are detected from sensor output. A traffic jam / parking detection unit 6h that detects the traffic, an auxiliary image information generation unit that generates predetermined auxiliary image information, and a drawing enable unit 6j that instructs the map drawing control unit 6f to draw the auxiliary image. The map read control unit 6b receives the current vehicle position data PDT, reads the map data corresponding to the current vehicle position from the CD-ROM 1, and stores it in the map data buffer memory 6a. The vehicle position / azimuth calculation unit 6c calculates the vehicle current position and sensor azimuth according to the equations (1) to (3) based on the outputs of the angle sensor 5a and the distance sensor 5b.

The vehicle position correcting unit 6d includes a traveling locus storage unit 6d-1 for storing the vehicle position and the sensor azimuth as a traveling locus for each predetermined time or for each predetermined distance, and a GP from the GPS receiver.
Each time the S azimuth is input, the GPS azimuth θgi, the sensor azimuth θsi at that time, the positioning time Ti, and the azimuth data storage unit 6d-2 that stores the latest offset angle θoff, and the map matching processing unit 6d-3 are included. ing. The map matching processing unit 6d-3 performs the map matching process using the road data and the traveling locus data read out to the map data buffer memory 6a, and when the map matching becomes impossible, the azimuth data storage unit 6d- The offset angle, that is, the absolute traveling azimuth is corrected using the azimuth data stored in 2.

The vehicle position mark generator 6e receives the vehicle position data PDT and generates vehicle position mark data. The auxiliary image information generator 6i outputs information for generating a predetermined auxiliary image, and the auxiliary image information includes the following. Screen saver image information (for example, predetermined still image information) Information data in IIS information near the vehicle position (tourist information etc.) Environmental video image information in IIS information Message prepared by the system (date and time information, holiday information) Message, schedule information set by the user, etc. The drawing enable unit 6j is instructed by the operation unit 2 to display an auxiliary image, and is in a traffic jam, parking, or GPS non-positioning (only with GPS). When detecting the vehicle position), an auxiliary image drawing enable signal DIN for instructing drawing of the auxiliary image is output. Map drawing controller 6f
When the auxiliary image drawing enable signal DIN is at a low level, the map buffer memory 6a and the vehicle position mark generator 6 are
The map data around the current vehicle position and the vehicle position mark data are read from e and input to the display device 7, and
When the auxiliary image drawing enable signal DIN is at high level,
The auxiliary image information is read and input to the display device 7.

(A-6) Display Device The display device 7 has a CRT controller 8 for generating a bitmap image from image information, a video RAM (V-RAM) 9 for storing the generated image, a read control section 10, It has a CRT 11 and the like, and displays a desired map, vehicle position mark, and auxiliary image on a CRT screen (screen).

(A-7) Overall Operation The operation unit 2 is operated to operate the key 2a to instruct to display an auxiliary image when a predetermined condition is satisfied. The map read control unit 6b reads the map data corresponding to the current vehicle position from the CD-ROM 1 based on the vehicle position data PDT input from the vehicle position correction unit 6d and stores it in the map data buffer memory 6a. The map drawing control unit 6f reads the map data around the current vehicle position from the map data buffer memory 6a, reads the vehicle position mark data from the vehicle position mark generation unit 6e, and inputs them to the display device 7. The display device 7 displays a map and a vehicle position mark on the display screen based on the input information,
After that, the display of the map and the vehicle position mark according to the vehicle position is continued.

In this state, the GPS receiver 3 has three
If it can be measured by two-dimensional positioning or two-dimensional positioning,
Positioned data Pi and heading data (GPS heading) θg
i and the positioning time Ti are input to the vehicle position correction unit 6d.
Further, the vehicle position / azimuth calculation unit 6c uses the outputs of the angle sensor 5a and the distance sensor 5b to calculate the current position Psi of the vehicle and the traveling azimuth (sensor azimuth) θsi at predetermined time intervals, and then to the vehicle position correction unit 6d. input. The vehicle position correction unit 6d is G
When the PS data is received, the GPS bearing θgi, the sensor bearing θsi at that time, and the positioning time Ti are stored in the bearing data storage unit 6d-2.
To memorize. Further, the vehicle position correction unit 6d is a traveling locus storage unit.
6d-1 sequentially stores the vehicle position and the sensor azimuth θsi input from the vehicle position / azimuth calculation unit 6d.

The map matching processing section 6d-3 judges whether or not the map matching processing is necessary, and if not, repeats the above-mentioned processing for storing the azimuth data and the traveling locus. On the other hand, if map matching is required, it is determined whether map matching is possible. If map matching is possible, the vehicle current position is corrected by the method described above, and the corrected value is used as the vehicle position / direction calculation unit 6c and the vehicle position mark generation unit 6
Enter in e. The vehicle position mark generation unit 6e generates a vehicle position mark so as to be displayed on the corrected current vehicle position, and the map drawing control unit 6f controls the vehicle position mark generation unit 6e.
The vehicle position mark data is read and input to the display device 7 and displayed at the corrected position on the map. When the vehicle is caught in traffic, parked, or enters a GPS non-positioning state while the map image is displayed, the drawing enable unit 6j sets the auxiliary image drawing enable signal DIN to a high level. As a result, the map drawing control unit 6f reads the auxiliary image information (for example, screen saver image information) from the auxiliary image information generating unit 6i and inputs it to the display device 7. The display device 7 uses the auxiliary image information to display a screen saver image on the display screen instead of the map image.

Thereafter, when the traffic is released, when the vehicle is no longer parked, when GPS positioning becomes possible, or when the operation key 2a is operated, the operation of returning the auxiliary image drawing to the original map image drawing is performed. At this time, the drawing enable unit 6j sets the auxiliary image drawing enable signal DIN to the low level. When the enable signal DIN becomes low level, the map drawing control unit 6f causes the map data buffer memory 6
The map data around the current vehicle position is read from a and the vehicle position mark data is read from the vehicle position mark generation unit 6e and input to the display device 7 and displayed on the display screen. Although the screen saver image is displayed as the auxiliary image in the above, it is also possible to display another image other than the map such as the tourist guide image. Further, the auxiliary image can be displayed not only in the stopped state, the parked state, and the GPS non-positioning state, but also in a traveling state where it is not necessary to display the vehicle position such as a one-way traveling state such as an expressway.

(B) Second Embodiment of the Present Invention (b-1) Overall Configuration FIG. 3 is a configuration diagram of a navigation device according to a second embodiment of the present invention, which is the same as the first embodiment shown in FIG. The same parts are given the same reference numerals. The difference from the first embodiment is that, as an auxiliary image, for example, tourist guide information near the vehicle position is displayed, and an auxiliary image is displayed even when the vehicle is running on a single road such as a highway. IIS with image information stored in CD-ROM
The point is to search and output using information.

In FIG. 3, 6m is an IIS information buffer memory for storing IIS information of the area where the vehicle position is located, and 6n is information data for retrieving and outputting information data (tourist information) near the traveling position from the IIS information. A search / output unit, 6p is a road discriminating unit that detects a traveling state of a single road such as an expressway, and 6q is a drawing enable unit. The drawing enable unit 6q is instructed by the operation unit 2 to display an auxiliary image, and is assisted by the operation unit 2 during traffic jams, parking, or GPS non-positioning (when the vehicle position is detected only by GPS). When the display of an image is instructed and the vehicle is traveling on a single road such as a highway, a high-level auxiliary image drawing enable signal DIN for instructing the drawing of an auxiliary image is output.
The road discriminating unit 6p uses the road layer information and the vehicle position data PDT read in the map data buffer memory 6a.
The road to which the vehicle belongs is further identified, the distance from the vehicle position to the next intersection is calculated, and when the distance is equal to or greater than the set value, the single road traveling signal LRC is output.

When the auxiliary image drawing enable signal DIN is at a low level, the map drawing control section 6f reads the map data around the current vehicle position and the vehicle position mark data from the map buffer memory 6a and the vehicle position mark generating section 6e and displays them. When the auxiliary image drawing enable signal DIN is at a high level, the auxiliary image information (tourist information) is read from the information data retrieval / output unit 6n and input to the display device 7.

(B-2) Overall operation The operation section 2 is operated to instruct to display the tourist guide image when a predetermined condition is satisfied by operating the key 2a. The map read control unit 6b reads the map data corresponding to the current vehicle position from the CD-ROM 1 based on the vehicle position data PDT input from the vehicle position correction unit 6d and stores it in the map data buffer memory 6a. The map drawing control unit 6f reads the map data around the current vehicle position from the map data buffer memory 6a, reads the vehicle position mark data from the vehicle position mark generation unit 6e, and inputs them to the display device 7. The display device 7 displays the map and the vehicle position mark on the display screen based on the input information, and thereafter continues to display the map and the vehicle position mark according to the vehicle position. In parallel with the above, the IIS information of the area where the vehicle is located is stored in the CD-ROM 1 by the map read control unit 6b.
And is stored in the IIS information buffer memory 6m.

In this state, when the vehicle is caught in a traffic jam, parked, or enters a GPS non-positioning state, the drawing enable section 6q sets the auxiliary image drawing enable signal DIN to the high level. As a result, the map drawing control unit 6f reads the tourist guide information from the information data search / output unit 6n, and the display device 7
The display device 7 displays a tourist guide image on the display screen as shown in FIG. 4A instead of the map image. After that, when the traffic is released, when the vehicle is no longer parked, when GPS positioning is possible, or when the operation key 2a is used to return the auxiliary image drawing to the original map image drawing, The drawing enable unit 6q sets the auxiliary image drawing enable signal DIN to the low level. When the enable signal DIN becomes low level,
The map drawing control unit 6f reads the map data around the current vehicle position from the map data buffer memory 6a, reads the vehicle position mark data from the vehicle position mark generation unit 6e, and inputs them to the display device 7 to display the map and the vehicle position mark. Display on the display screen.

On the other hand, when the vehicle is traveling on a single road such as an expressway, the single road running signal L is output from the road discriminating section 6p.
RC is output. Even in such a case, the drawing enable unit 6q sets the auxiliary image drawing enable signal DIN to the high level. As a result, the map drawing control unit 6f reads the tourist guide information from the information data search / output unit 6n and inputs it to the display device 7, and the display device 7 displays the tourist guide image on the display screen instead of the map image. After that, when the vehicle is no longer running on a single road (when an intersection is near, when an exit is near on a highway, etc.), or when the operation key 2a is used, an operation of returning the auxiliary image drawing to the original map image drawing is performed. At this time, the drawing enable unit 6q sets the auxiliary image drawing enable signal DIN to the low level and displays the map and the vehicle position mark on the display screen. Although the example of displaying the tourist guide image is described above, it may be configured to display highway information (see FIG. 4B) and other information.

(C) Third Embodiment of the Present Invention FIG. 5 is a configuration diagram of a navigation device according to a third embodiment of the present invention. The same parts as those in the second embodiment of FIG. are doing. The difference from the second embodiment is that when the tourist guide information is indicated by the operation keys 2b of the operation unit 2, the tourist attractions, service areas, gas stations, etc. existing on the displayed map are displayed in an overlapping manner on the map. That is the point. 6m is an IIS information buffer memory that stores IIS information of the area where the vehicle position is, 6n is information data search that searches and outputs information data (tourist information, service area information, etc.) near the driving position from the IIS information. It is an output part.

The operation section 2 is operated to operate the key 2b to instruct to display a tourist guide image or the like. Map read control unit 6b
Is the vehicle position data P input from the vehicle position correction unit 6d.
CD map data based on the current vehicle position based on DT
-Map data buffer memory 6 read from ROM1
Store in a. Further, the map reading control unit 6b reads the IIS information of the area where the vehicle position is located and stores it in the IIS information buffer memory 6m.

The map drawing control unit 6f reads the map data around the current vehicle position from the map data buffer memory 6a, reads the vehicle position mark data from the vehicle position mark generation unit 6e, and further reads from the information data search / output unit 6n. The tourist guide information and the like around the vehicle area are read and input to the display device 7. The display device 7 generates an image using the input data, and displays the vehicle position mark CMK, the tourist spot marks A to D, and the tourist spot names a to d on the map image as shown in FIG. 6A. Display on screen. After that, the map corresponding to the vehicle position, the vehicle position mark, and the tourist guide information are sequentially displayed on the display screen.

In the case of an expressway, it is meaningless to display a tourist spot that has gone too far, so it is possible not to display it (the tourist spot A in FIG. 6A is not displayed). In addition, as shown in Fig. 6 (b), the main line SRD of the expressway
When you get off and enter the access road ACR to the exit, II
The S information may be used to display a list of high speed tolls at the exit. Furthermore, if you are traveling on the expressway as an up line (down line), it does not make sense to display various facilities such as the service area of the down line (up line), so the dotted line in Fig. 6 (c) The display may be omitted as shown. Although the present invention has been described above with reference to the embodiments, the present invention can be variously modified according to the gist of the present invention described in the claims, and the present invention does not exclude these.

[0034]

As described above, according to the present invention, a traveling state in which it is not necessary to display the vehicle position on a map (for example, traffic jam, parking, one-way traveling on a highway, etc.) is detected, and the traveling state is detected. At times, images other than maps, such as screen saver images (still images), IIS information or information data in the vicinity of the vehicle position, are displayed on the display screen, so that various types of information can be utilized and still interesting. Can be displayed.
Further, according to the present invention, when the display of the information data is instructed, the information information (tourist information etc.) corresponding to the current position of the vehicle is searched from the IIS information and the searched information data is displayed on the display screen. Since it is configured so that the IIS information can be utilized and the service can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a first navigation device of the present invention.

FIG. 2 is an explanatory diagram showing a structure of road data in map data.

FIG. 3 is a configuration diagram of a second embodiment of the navigation device of the present invention.

FIG. 4 is a display example of an auxiliary image.

FIG. 5 is a configuration diagram of a third embodiment of the navigation device of the present invention.

FIG. 6 is a display example of a tourist spot and other displays.

FIG. 7 is an explanatory diagram of data stored in a map.

FIG. 8 is an explanatory diagram of position and azimuth calculation by self-contained navigation.

FIG. 9 is an explanatory diagram of map matching processing by a projection method.

[Explanation of symbols]

 1.-CD-ROM 2.-Operation unit 3.-GPS receiver 5.-Self-contained navigation sensor 6.-System controller 6f-Map drawing control unit 6g-Non-positioning detection unit 6h-Congestion / parking detection unit 6i ... Auxiliary image information generating section 6j ... Drawing enabling section 7 ... Display device

Claims (2)

[Claims] 1. In a vehicle-mounted navigation device that displays a map corresponding to a vehicle position on a display screen together with a vehicle position mark, a detection means for detecting a traveling state in which it is not necessary to display the vehicle position on the map, and an image other than the map. And a means for displaying an image other than the map on the display screen when the vehicle is in a traveling state where it is not necessary to display the position of the vehicle on the map. 2. An in-vehicle navigation device for displaying a map according to a vehicle position on a display screen together with a vehicle position mark, means for instructing display of information data, means for measuring the current position of the vehicle, and display of information data. The navigation device is provided with means for displaying information data according to the current position of the vehicle on the display screen when the instruction is given.