JPH0894368A - Navigation device for vehicle - Google Patents

Abstract

PURPOSE: To surely guide a vehicle at a crossroads by providing direction data on a road for going out against an access road connected to each other at the crossroads and outputting guiding information based on the direction data. CONSTITUTION: A present location detector 2 calculates the present location of its own vehicle. In addition, an input-output device 1 which calculates a route and informs the driver of the vehicle of the information about the route and an information storing device 3 which stores all data required for guiding routes are provided. The CPU 40 of a central processing unit 4 calculates the route based on the information inputted from an inputting means, temporarily stores the calculated route in a RAM 42, and controls the guidance by outputting the information about the route to an outputting means. The central processing unit 4 outputs the information based on crossroads data stored in the storing device 3 and the direction data on a road for going out against an access road connected to each other at a crossroads.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular navigation system which provides guidance in a direction to go at a branch point.

[0002]

2. Description of the Related Art A vehicular navigation device mounted on an automobile or the like inputs a point such as a destination and searches for a route from the current position to provide route guidance. When passing a branch point such as an intersection. Can show a route on the display to guide the driver whether to go straight or turn left or right, and can also give a voice direction to the driver so that the driver does not need to look at the display. I am trying. Therefore, the applicant has determined that, at the branch point for route guidance, if the angle difference between the approach direction and the exit direction is within a predetermined angle with reference to the direction of the approach road, the vehicle should go straight, and the angle difference It proposes a technique of performing route guidance by voice so that it is determined that a right turn or a left turn should be made when the angle exceeds a predetermined angle. (Patent application 4
-193572)

[0003]

However, when the advancing direction is determined by the angle difference as in the above method, when the angle difference between the approaching direction and the advancing direction is very small, it is always determined that the vehicle is going straight. Since the guidance is provided, the driver needs to look at the intersection map or the map displayed on the display in order to confirm the wrong direction or the right direction to go by the voice guidance alone.

For example, as shown in FIG. 18, at an intersection of four difference roads, an exit road is a road A of 30 degrees to the left, a road B of 10 degrees to the right, and a road of 90 degrees to the right. When the road C is narrower than the roads A and B, for example, when it is determined that all the roads are straight ahead within 20 degrees with respect to the approach direction, when guiding to the road B, the above-mentioned four-way intersection , Road B is determined to be a straight direction. However, since the road B is narrow, the driver judges that the above-mentioned four-way intersection is a Y-shaped junction that branches into road A and road B, and road B is highly likely to be in the right direction. A discrepancy between the guidance and the driver's judgment occurs, and the driver needs to confirm the traveling direction by looking at the intersection map or the map displayed on the display in order to confirm the wrong direction or the traveling direction.

In addition, at the exit of a bypass or the like, the intersection angle between the main road and the exit road is often very small, and when the above direction determination is used, the exit road is also guided to go straight, so that the driver can display it. It was necessary to check the road above, and there was the problem that drivers who rely only on voice would pass by.

The present invention is intended to solve the above problems, and it is difficult to determine the direction in which to proceed based on the angle difference, such as the angle difference between the approach road and the approach road is very small at the branch point for route guidance. Even in such a case, it is an object of the present invention to provide a vehicle navigation device that can surely guide a driver in a direction to go at a guidance branch point without hesitating and reduce the burden on the driver.

[0007]

Therefore, as shown in FIG. 19, the vehicle navigation system of the present invention provides a current position detecting means for calculating the current position of the vehicle and information necessary for calculating the route. An input means for inputting, an output means for notifying information for performing route guidance, an information storage device storing all data necessary for performing route guidance,
Route calculation means for calculating a route based on the information input by the input means, route storage means for temporarily storing the route calculated by the route calculation means, and guidance information on the route to the output means Guidance control means for
And a central processing unit consisting of
The branch point data and the road data connected to the branch point are stored, and the direction data of the exit road to the approach road connected at the branch point is provided, and the guidance control means outputs the guidance information based on the direction data. It is characterized by outputting to.

The following configurations are mentioned as an embodiment. The guidance control means includes a determining means for determining whether or not the direction data of the approach road to the approach road connected at the branch point is in the route storage means, and if the direction data is present, based on the direction data. A configuration in which guide information is output to an output means. The guidance control means includes a calculating means for calculating a traveling direction based on an angle difference between the approaching path and the approaching path. When the determining means determines that there is no direction data, the calculating means calculates the traveling direction. A configuration in which guidance information is output to an output means based on the traveling direction. The output means is
The guide control means includes a display means for notifying information required for route guidance on the screen and / or a voice output means for notifying by voice, and the guide control means outputs the guide information to the display means. And / or a voice control means for outputting to the voice output means. The display control means outputs arrow information indicating a direction to the output means based on the direction data, and the display means displays an arrow on a screen based on the arrow information.

[0009]

In the vehicular navigation device of the present invention, the direction data of the approach road to the approach road connected at the branch point is added to the data to be referred when performing guidance, and based on the direction data at the time of guiding the traveling direction. Since the guide information is output by the driver, even if the angle difference between the approach road and the exit road is very small at the branch point for route guidance, it is difficult for the driver to determine the direction in which to proceed. It is possible to reliably guide the vehicle in the direction in which the vehicle should move at the guidance branch point, and to reduce the burden on the driver.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a vehicle navigation device 1 according to the present invention.
It is a block block diagram which shows an Example. A vehicle navigation device according to the present invention includes an input / output device 1 for inputting / outputting information about route guidance, a current position detecting device 2 for detecting information about the current position of a vehicle, navigation data necessary for route calculation and guidance. An information storage device 3 in which necessary display guidance data and the like are recorded, and a central processing unit 4 that executes route search processing and display guidance processing required for route guidance and controls the entire system. First, each configuration will be described.

The input / output device 1 is a central processing unit that performs navigation processing according to the driver's will so that the driver can input guidance information and output guidance information from at least one of voice and screen when the driver needs it. 4 and a function of printing out processed data and the like. As a means for realizing that function, the input section has a touch switch 11 and an operation switch for inputting a destination with a telephone number, coordinates, etc., or requesting route guidance, and the output section has Displaying input data on the screen or automatically displaying route guidance on the screen in response to a driver's request, prints out data processed by the central processing unit 4 and data stored in the information storage device 3. A printer 13 and a speaker 16 for outputting route guidance by voice are provided.

The display 12 is composed of a color CRT or a color liquid crystal display, and is necessary for navigation such as a route setting screen based on map data or guidance data processed by the central processing unit 4, a section map screen, an intersection map screen, etc. All screens are displayed in color, and on this screen, buttons for setting route guidance, guiding during route guidance, and switching screens are displayed. In particular, passing intersection information such as the name of a passing intersection is displayed in a pop-up color on the section map screen at any time.

The display 12 is provided in the instrument panel near the driver's seat, and the driver can confirm the present location of the vehicle by looking at the displayed map.
You can also get information about future routes. Further, the display 12 is provided with a touch panel 11 corresponding to the display of the function buttons, and is configured so that the above operation is executed based on a signal input by touching the button. The input signal generating means including the buttons and the touch panel constitutes an input section, but detailed description thereof will be omitted here.

The current position detecting device 2 is a GPS receiving device 21 using a satellite navigation system (GPS), a beacon receiving device 22, for example, a data transmitting / receiving device 2 for receiving a GPS correction signal using a cellular phone or an FM multiplex signal.
3, an absolute azimuth sensor 24 including a geomagnetic sensor,
A relative direction sensor 25 including a wheel sensor, a steering sensor, a gyro, and the like, a distance sensor 26 that detects a moving distance from the number of pulses output in proportion to the rotation of the wheel, and the like are provided.

The information storage device 3 stores map data, intersection data, node data, road data, destination data, guide point data, road name data, branch point name data, guide road data, shape data necessary for route guidance. It is a database consisting of files of guidance data, destination data, and other data in which all data necessary for the navigation device is recorded.

The central processing unit 4 is a C for executing arithmetic processing.
PU 40, a program for performing processing such as route search, a display control required for route guidance, a program for performing voice output control required for voice guidance, and a first ROM 41 storing data necessary for that, a set purpose Ground point coordinates, road code No. RAM 42 for temporarily storing the searched route guidance information such as data and data being processed, second ROM 43 storing display information data required for route guidance and map display, image data used for screen display on the display Image memory 44 in which is stored, CPU 40
Image processor 45 which takes out image data from the image memory based on the display control signal from the image processor 45, which performs image processing and outputs the image data to the display, voice read from the information storage device 3 based on the voice output control signal from the CPU, phrase, A voice processor 46 for synthesizing a single sentence, sound, etc., converting it into an analog signal and outputting it to a speaker,
It is provided with a communication interface 47 for exchanging input / output data by communication, a sensor input interface 48 for taking in sensor signals of the current position detecting device 2, a clock 49 for entering date and time in internal diagnostic information, and the like. Here, the route guidance is configured so that the driver can select either screen display or voice output.

2 to 4 show examples of the structure of main data files stored in the information storage device 3 according to the present invention shown in FIG. FIG. 2A shows a guide road data file, which is composed of road number, length, road attribute data, shape data address, size, guide data address, and size data for each number of roads n. . The road number is set for each of the roads between the branch points (direction, return). As shown in FIG. 3 (A), the road attribute data is composed of data indicating whether the road is an elevated road, a side of an elevated road, an underpass, or an underpass, and data indicating the number of lanes. . As shown in FIG. 2B, when the road is divided into a plurality of nodes, the shape data has coordinate data of east longitude and north latitude for each m node number.

As shown in FIG. 2C, the guidance data includes intersection (or branch point) name, caution point data, road name data, address of road name voice data, size and destination data address and size. It consists of each data. As shown in FIG. 4 (A), the caution data is data indicating information such as railroad crossings, tunnel entrances, tunnel exits, width reduction points, and nothing. Crossings other than branch points, tunnels, etc. This is the data for calling the driver's attention in. As shown in FIG. 3B, the road name data includes information on road types of highways, urban highways, toll roads, general roads (national roads, prefectural roads, etc.), highways, urban highways, and toll roads. It is data showing information indicating whether the road is a main road or an installation road, and is composed of road type data and an in-type number which is individual number data for each road type.

As shown in FIG. 2D, the destination data includes a destination road number, a destination name, an address of destination name voice data, a size and a destination direction data, and a travel guidance data. The destination direction data is invalid (does not use the destination direction data), unnecessary (does not provide guidance), straight ahead, rightward, diagonally rightward, rightwardly returning, leftward, diagonally leftward, or leftwardly returning information. Is data indicating. As shown in FIG. 4B, the travel guidance data is
Stores data for guiding which lane to drive when there are multiple lanes. From right or left,
It is data indicating information from the center or nothing.

Next, the flow of processing of the vehicle navigation device of the present invention will be described. FIG. 5 is a flow chart for explaining the flow of the entire system of the vehicle navigation device according to the present invention. CPU 40 of central processing unit 4
When the route guidance system program is started by
First, the current position detecting unit 2 detects the current position and displays a peripheral map around the current position,
The name of the current position and the like are displayed (step S1). next,
A destination is set using a telephone number, an address, a facility name, a registration point, etc. (step S2), and a route search from the current position to the destination is performed (step S3). When the route is determined, the current position is traced by the current position detection device 2 and the route guidance / display is repeatedly performed until the destination is reached (step S4).

According to the present invention, the route guidance / step guidance in step S4 is performed.
The display relates to route guidance at a branch point, and FIGS. 6, 7, and 9 to 11 are flow charts showing the flow of the processing. Further, the route to reach the destination is set as a road connection between branch points as shown in FIG. 8A, and the road numbers to be guided are arranged in the order of guidance as shown in FIG. 8B. It is retained as the arranged guide road number data.

FIG. 6 is a basic flow chart showing the process of route guidance at a branch point in the present invention. First, step S
At 11, the guide road (approach) data of FIG. 2 (A) connected to the branch point is acquired. Next, in step S12, as shown in FIG.
Based on the destination data of (D), the destination direction data of the road (exit road) exiting from the branch point is checked for "unnecessary" to determine whether or not the guidance is required. If the guidance is not required, in step S13, the road name data of FIG. 3B is checked to check the types of approach road and exit road, and the guidance of steps S14 to S19 is executed according to the type. For example,
If the approach road is a general road, a high-speed main line, or an installation road and the exit road is a general road, guidance for entering the general road is executed (step S14), and the approach road is a general road. If is the high speed main line or the installation road, guidance for entering from the general road to the high speed main line or the installation road is executed (step S15). In addition, guidance according to the type of approach road and exit road is executed (steps S16 to S19).

If the guidance is not required in step S12, the traveling guidance data (FIG. 4 (B)) storing data for guiding which lane to drive when there are a plurality of lanes on the exit road in step S20. If there is travel guidance data, in step S21, travel guidance from the right, the left, or the center is executed. If there is no driving guidance data, in step S22 the railroad crossing other than the branch point,
It is checked whether or not there is caution data (Fig. 4 (A)) in the guidance data for calling the driver's attention in a tunnel or the like. If there is caution data, in step S23,
Execute the guidance for crossing, tunnel entrance, tunnel exit, and width reduction point. If there is no caution data, the road name data (Fig. 3 (B)) of the exit road is checked from the destination data in step S24, and if entering a high speed, a city high or a toll road, a toll entrance guidance is given in step S25. Run.

FIG. 7 is a flow chart showing the flow of processing for guiding into the general road in step S14 of FIG. 6, for example. First, in step S31, the road number exiting from the branch point is acquired. For example, as shown in FIG. 8 (A), when the approach road number 1 is the approach road number 4 and the approach road number 4 is 4, the approach road number 5 is acquired, and as shown in FIG. 8 (B). Guided road number data is created in which the road strings to be guided are stored in order. Next, the destination data of the road exiting in step S32 is searched from FIG. 2 (D). Then, the direction determination process is performed in step S33, and the auxiliary guidance setting process is performed in step S34. The processing of steps S33 and S34 will be described below.

FIG. 9 is a flow chart showing the flow of the direction determination process in step S33 of FIG. Note that steps S31 and S32 of FIG. 7 are shown in an overlapping manner. In step S42, the destination direction data in the destination data (see FIG. 2)
(E)) is searched. Here, the destination direction data is stored in the road data of the road exiting from the branch point corresponding to the road entering the branch point, and auxiliary guidance is provided depending on the positional relationship between the road entering the branch point and the road exiting the branch point. To decide which direction to take, to make it unnecessary to guide the direction,
The data is stored as "invalid" when the direction is determined by calculation without the need for auxiliary guidance. In step S43, it is determined whether or not the destination direction data in FIG. 2 (E) is "unnecessary". If "unnecessary" (guidance is unnecessary), nothing is done and the process proceeds to another process, "unnecessary". If not, it is determined in step S44 whether or not the destination direction data is "invalid", and if it is "invalid", determination processing based on the azimuth in step S45 is performed. This process determines that the vehicle should go straight if the angle difference between the approaching direction and the approaching direction is within a predetermined angle based on the direction of the approaching road, and should turn right or left if the angle difference exceeds the predetermined angle. Is a method of determining.

A determination method based on this azimuth will be described with reference to FIGS.
Will be described. FIG. 10 is a diagram showing the shape of a branch point, FIG.
FIG. 1 is a flow chart, and FIG. 12 is a diagram for explaining an example of voice expression allocation. In FIG. 10, the approach road from which the vehicle enters is indicated by R _S , and the three roads connected to the branch points are indicated by R _{1 to} R ₃ . In this determination method, the guide is a road becomes path R _m unnecessary road, the road becomes path R _m, connecting road number, connection angle theta ₁ through? _3, so as to determine the width W ₁ to _W-3 of the connecting road I have to. Then, as shown in FIG. 11, the angle between the extension line of the incoming road R _S and the road becomes path R _m and theta _m in step 47, in step 48, as shown in FIG. 12, the size of the theta _m and allocating voice expression conditions and the guide path from the area that contains the (advancing path) R _a. For example, when the range is −70 ≦ θ _m <−40, “turn left”, “turn left”, “go right”, “turn right”, “turn right”. A turn expression is assigned according to the area of the guideway R _a , such as “turn like”. Therefore, since the road R _m is on the left, the expression “go right” is assigned in the predetermined range that is actually located in front of the approach road R _S. This is because the driver tends to judge that the road is almost straight, and the expression "go right" is a more correct expression to clarify the distinction from the road. Is.

As described above, when the destination direction data of the guide road data is "invalid", that is, when there is no destination direction data, it is determined by the angle between the direction of the road entering the branch point and the direction of the road exiting from the branch point. Determine the direction of travel.
If the direction can be determined from the angles of the approach road and the exit road by determining the direction using the above method and creating the guidance text for the branch point guidance, the amount of data can be reduced without having direction data. Further, since the destination direction data is provided as the data indicating the direction when the direction cannot be determined from the angle, more reliable route guidance can be provided.

Returning to FIG. 9, step S44 will be described.
If the destination data is not "invalid" in step S, step S
At 46, from the destination direction data of FIG. 2 (E), go straight, rightward, diagonally rightward, return rightward, leftward, diagonally leftward,
Get the direction of travel to the left.

FIG. 13 is a flow chart showing the flow of the auxiliary guide setting process in step S34 of FIG. First,
In step S51, the destination name is searched from the destination data in FIG. 2D, and if there is a destination name, the destination name voice is set as the auxiliary voice in step S55. If there is no destination name, the process proceeds to step S52, and the road attribute data of FIG. 3A is acquired from the guide road data of the destination road (exit road) of FIG. 2A. Next, in step S53,
It is determined whether or not there is an underpass, and if there is no underpass, the process proceeds to another process, and if there is an overpass / underpass, the process of setting up an underpass / underpass is performed in step S54.

FIG. 14 is a flow chart showing the flow of processing for setting elevated / underpass guidance in step S54 of FIG. In step S61, the elevated / underpass is determined from the road attribute data of FIG. 3A, and if it is determined in step S62 that the guide road is "overpass", the voice "enter the elevated" is an auxiliary voice in step S63. Set to. If it is determined in step S62 that there is no "overpass", step S62
At 64, it is determined that the guide road is "beside the elevated", and if yes, the voice "Do not enter the elevated" is set as the auxiliary voice at step S65. If it is determined in step S64 that there is no "horizontal overpass", in step S66 "underpass"
It is determined whether or not there is, and if there is, the voice of "entering the underpass" is set as the auxiliary voice in step S67. If it is determined in step S66 that there is no "underpass", it is determined in step S68 that "beside the underpass" is present, and if yes, the voice that "do not enter the underpass" is set as an auxiliary voice in step S69.

In the meantime, the above-mentioned auxiliary voice is the main voice which is the voice guidance performed by the determination based on the angle difference.
It is a voice guidance performed by the determination based on the guide road data.

Next, route guidance at a branch point will be described with reference to FIGS. 15 to 17 according to concrete screen examples.
FIG. 15 shows a case in which both the approach road and the exit road are ordinary roads, and FIG. 15 (A) shows a case where the destination direction data of FIG. , Diagonally to the right in Fukada-cho (intersection name). " In FIG. 15 (B), when the destination direction data is "5" and there is a destination name, the voice guidance "Pawn, about 300 meters ahead, Iidabashi is to the left. It is toward Suidobashi." In FIG. 15 (C), when the destination direction data is "1" and the road attribute data has "overpass (gray part)", "Pawn is about 300 meters ahead, straight ahead. Enter the elevated." Provide voice guidance. In FIG. 15D, when the destination direction data is “5” and the driving guidance data includes “from left”, “pawn,
Approximately 300 meters ahead, turn left. After that, enter the left lane. Voice guidance. Each of the above-mentioned examples is an example in which voice guidance is provided together with the intersection map guidance.
(E) shows an example in which there is no intersection map guidance and only voice guidance is provided. When the driving guidance data contains "from the center", the voice guidance "pawn, please drive from the center lane ahead." And take "Cross level" to the point data
When there is, the voice guidance "Pawn, I will pass the railroad crossing."

FIG. 16 shows a voice guidance in the vicinity of a high speed and the like, and FIG. 16 (A) shows a voice guidance such as "Pawn, about 300 meters ahead, Tomei Expressway direction." If there is no destination data, "Pawn,
About 300 meters ahead, high speed. Voice guidance.

FIG. 16B shows the voice guidance of the pay entrance guidance "Pawn, ahead of Tomei Expressway" when the usual main voice guidance is unnecessary. If there is no destination data, the voice guidance "Pawn, ahead, high speed."

FIG. 16 (C) shows a "pawn, when there is a toll gate in front of a guidance junction when traveling from an installation road to an installation road, and when there is destination direction data or direction determination based on an angle difference is possible. Beyond the toll booth, towards Kyoto. " If you don't have a toll booth, "Pawn,
For Kyoto. Voice guidance. At this time, an arrow indicating the direction is displayed on the map screen along with the direction name.

FIG. 16 (D) shows that when there is a tollgate in front of the guidance junction when going from the installation road to the installation road, and there is no destination direction data and the direction cannot be determined, the "pawn, tollgate" is displayed. Beyond, the direction of Shizuoka. " Also, only the direction name is displayed on the map screen.

FIG. 16 (E) shows the case of going from the high speed main line to the main line, and when there is destination direction data or direction determination is possible,
"Pawn, about 1 km ahead, towards Kyoto. Right direction." If there is no destination direction data and the direction cannot be determined, "Pawn, approx. 1
A kilometer ahead, towards Kyoto. Voice guidance.

FIG. 16 (F) shows the case where the highway main line is advanced to the installation road, and the voice guidance "Pawn, approximately 1 km ahead, is the highway Komaki Higashi Inter exit."

FIG. 17 shows an example in which the display "direction" is added to the upper right display of the screen when there is no destination direction data and the direction cannot be determined as in 16 (D). This makes it easier to understand that the direction name displayed on the map screen represents the direction.

Arrows indicating directions are displayed in FIGS. 16C and 16E, but when the direction guidance is performed by the direction determination based on the azimuth, the guidance based on the determined direction and direction data is provided. If you do, determine the shape of the arrow to be displayed based on the data. For example, the arrow data to be displayed may be divided into three types, one for the right direction, one for the left direction, and one for the straight direction, and the directions obtained by the direction determination or the direction data as described above may be allocated respectively. Good. In this way, the arrow indicating the direction is displayed together with the direction name, so even if it is difficult to determine in which direction to proceed with only the map displayed on the screen, the driver can detect the direction sign that appears on the road in advance. You can check and drive with confidence.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made. For example, in the above embodiment,
The direction data of the approach road to the approach road connected at the branch point is the guide data (Fig. 2) in the guide road data (Fig. 2 (A)).
(C)) is stored as destination data (FIG. 2 (D)) and destination direction data (FIG. 2 (E)). Although the guidance information is output, the guidance data may be output by storing the direction data of each of the roads that advance to the side of the road that enters the branch point. In addition, the guidance information at the branch point is stored in the branch point data, and the direction data is stored in the data for all the combinations of the roads on the entry side to the road on the exit side for a plurality of roads connected at the branch point. Alternatively, the guidance information may be output.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a vehicle navigation device of the present invention.

FIG. 2 is a diagram showing a configuration example of a main data file according to the present invention shown in FIG.

3 is a diagram showing a configuration example of a main data file according to the present invention shown in FIG.

FIG. 4 is a diagram showing a configuration example of a main data file according to the present invention shown in FIG.

FIG. 5 is a flowchart for explaining the flow of the entire system of the vehicle navigation device according to the present invention.

FIG. 6 is a basic flow chart showing a process of route guidance at a branch point in the present invention.

FIG. 7 is a flowchart showing a flow of processing of guidance for entering an ordinary road in FIG. 6;

8 (A) is a diagram for explaining a road number from a branch point in FIG. 7, and FIG. 8 (B) is a diagram showing a structure of guide road number data.

9 is a flowchart showing the flow of direction determination processing in FIG. 7.

FIG. 10 is a diagram showing a shape of a branch point for explaining a determination method based on an azimuth.

FIG. 11 is a flowchart of determination based on azimuth.

FIG. 12 is a diagram for explaining an example of voice expression allocation in determination based on direction.

FIG. 13 is a flowchart showing a flow of auxiliary guidance setting processing in FIG.

FIG. 14 is a flowchart showing a flow of processing of setting elevated road / underpass guidance in FIG. 13;

FIG. 15 is a diagram for explaining route guidance at a branch point according to an example of a screen.

FIG. 16 is a diagram for explaining route guidance at a branch point according to a screen example.

FIG. 17 is a diagram for explaining route guidance at a branch point according to a screen example.

FIG. 18 is a diagram showing a shape of a branch point for explaining a problem of the present invention.

FIG. 19 is a diagram for explaining the configuration of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input / output device, 2 ... Current position detection device, 3 ... Information storage device 4 ... Central processing unit, 11 ... Touch switch, 12 ... Display 16 ... Speaker, 40 ... CPU, 41, 43 ... ROM,
42 ... RAM 44 ... Image memory, 45 ... Image processor, 46 ... Voice processor 47 ... Communication interface

Claims (5)

[Claims] 1. A current position detecting means for calculating a current position of a vehicle, an input means for inputting information necessary for calculating a route, an output means for notifying information for performing route guidance, and a route guidance. Information storage device that stores all the data necessary for performing the route calculation, route calculation means that performs route calculation based on the information input by the input means, and temporarily stores the route calculated by the route calculation means. A central processing unit including a route storage unit for controlling the route and a guide control unit for outputting guidance information about the route to the output unit, wherein the information storage unit includes branch point data and road data connected to the branch point. And storing the direction data of the exit road to the approach road connected at the branch point, and the guidance control means outputs the guidance information to the output means based on the direction data. A vehicle navigation device characterized by: 2. The guidance control means comprises a judging means for judging whether or not the direction data of the approach road with respect to the approach road connected at the branch point is in the route storage means. The vehicle navigation device according to claim 1, wherein the guide information is output to the output means based on the direction data. 3. The guide control means comprises a calculation means for calculating a traveling direction based on an angle difference between an approach road and an exit road,
When it is determined by the determining means that there is no direction data, the calculating means calculates the traveling direction,
3. The vehicle navigation device according to claim 2, wherein the guide information is output to the output means based on the traveling direction. 4. The output means comprises a display means for notifying information required for route guidance on the screen and / or a voice output means for notifying by voice, and the guidance control means gives the guidance information. The vehicular navigation device according to claim 1, comprising a display control unit for outputting to the display unit and / or a voice control unit for outputting to the voice output unit. 5. The display control means outputs arrow information indicating a direction to the output means based on the direction data, and the display means displays an arrow on a screen based on the arrow information. The vehicle navigation device according to claim 4.