JPH0894372A - Navigation device for vehicle - Google Patents

Abstract

PURPOSE: To enable a navigation device for vehicle to accurately guide a vehicle even when a crossroads having a complicate shape exists by adding auxiliary road guiding information data to the guidance about the crossroads. CONSTITUTION: An information storing device 3 stores auxiliary road guiding information data and the guidance control means of a central processing unit 4 reads out the data about a crossroads which exists in front of the present location of its own vehicle and requires guidance from the data about the route being guided stored in the storing device 3 when the present location of the vehicle detected by means of a present location detector 2 exists on the route being guided calculated by means of a route calculating means (CPU) 40. In addition, a discriminating means which discriminates whether or not auxiliary road guiding information data are to be added to the guidance about a crossroads requiring guidance is provided and, when the discriminating means discriminates that the auxiliary road guiding information data must be added to the guidance, the auxiliary data are added to the guidance about the crossroads and the guidance is outputted to an outputting means 1.

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 for guiding a vehicle at a branch point.

[0002]

2. Description of the Related Art Conventionally, various devices for reducing a burden on a driver during driving have been studied and mounted on a vehicle. Among these, there is a route guidance device that guides a road to be traveled to by inputting a destination. And in this route guidance device,
It has a function to inform the driver of the route to be selected when passing through a junction such as an intersection, and there are those that display the route on the display and those that guide the direction to go at the intersection by voice. Has been.

For example, in Japanese Utility Model Laid-Open No. 60-13413, a route guidance is specified at a branch point by a voice expression of eight directions (front-rear left-right, diagonal left-right, etc.) depending on an angle with respect to an approach direction. What is done is shown. According to such route guidance by voice, the driver can perform route guidance without looking at the display or the like and without adversely affecting the driving.

[0004]

However, in the above-mentioned route guiding device, since the judgment is made by the angle with respect to the approach direction, as shown in FIG. 17, for example,
When guiding a complicated shape of a junction or an intersection,
In some cases, the driver may not be able to accurately determine in which direction to proceed based on only the direction of travel. That is,
At an intersection with a complicated shape such that one road is an underpass, a side road that runs beside the underpass, and then an elevated road, or at an intersection, the direction of travel is indicated by voice expressions such as front-rear, left-right, and diagonal left-right. It is difficult to identify.

Therefore, the present invention solves the above-mentioned problems, and a vehicle navigation device capable of guiding a vehicle without error even when a complicatedly shaped branch point or intersection exists in the middle of the guide route. The purpose is to provide.

[0006]

To this end, a vehicle navigation system of the present invention comprises a current position detecting means for calculating the current position of the vehicle, an input means for inputting information necessary for calculating the route, and a route. Output means for notifying information for guidance, information storage means for storing all data required for route guidance, and route calculation means for performing route calculation based on the information input by the input means. ,
Guide control means for reading the data stored in the information storage means along the route calculated by the route calculation means and outputting it to the output means, wherein the information storage means
Road guidance auxiliary information data is stored, and when the current position detected by the current position detection means is on the route currently being guided calculated by the route calculation means, the guidance control means forwards the current position. Determination of whether to add the road guidance auxiliary information data to the guidance regarding the branch point requiring the guidance by reading the data regarding the branch point requiring the guidance of the route from the data regarding the route stored in the information storage means. Means for adding the road guidance assistance information data to the guidance regarding the branch point and outputting the guidance information to the output means when the determination means determines to add the road guidance assistance information data to the guidance regarding the branch point. It is characterized by doing.

[0007]

In the vehicular navigation device of the present invention, the characteristics of the road such as an elevated road, an underpass or a complicated intersection are converted into data as road guidance auxiliary information data, and the road in the direction of exit from the branch point is selected. If there is data on an elevated road or an underpass, or if there is a direction name, it is added to a voice guidance output or the like for guiding the direction of travel, and voice or the like is used to guide the elevated road, underpass or direction name. Therefore, even when the road to which the vehicle has turned left or right is divided into two roads or even at a complicated intersection, the driver can be surely guided without hesitation and the burden on the driver can be reduced.

Further, in order to determine whether or not the road guidance auxiliary information data should be added to the voice guidance output or the like for guiding the traveling direction, the data regarding the road going out from the branch point is searched within a predetermined distance range. If there is data indicating an elevated road or an underpass in the meantime, it is output by voice or the like. Therefore, especially if there is an elevated road, an underpass or a complicated intersection immediately after turning right and left and you cannot afford to decide which road to proceed, you should advance before entering the intersection where you should turn right or left in advance. You can get road information.

[0009]

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 intention so that the driver can input the destination and output the guidance information from at least one of the voice and the 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.

This 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 present position detecting device 2 is a data transmitting / receiving device 2 for receiving a GPS receiving device 21 using a satellite navigation system (GPS), a beacon receiving device 22, for example, a GPS correction signal using a cellular phone or 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 includes 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 in which data necessary for calculating a route by the route calculating means and performing route guidance is stored. For each number of roads n, the road number, length, and road Address of attribute data, shape data, address of size and guidance data,
It consists of each size data. 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 as the road guidance assistance information day is data showing information on the number of lanes, whether the road is an elevated road, an elevated road, an underpass, an underpass, or the like. is there. 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) name, attention point data, road name data, road name voice data address, size and destination data address, 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. 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, 9, 10, and 12 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)) that stores 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, it is determined in step S23 whether it is a railroad crossing or a tunnel entrance. , Guidance on whether to exit from the tunnel or the width reduction point is executed. 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 entering an ordinary 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 flowchart showing the flow of the direction determining 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 is a conventional method, and if the angle difference between the approaching direction and the exiting direction is within a predetermined angle with reference to the direction of the approach road, it is determined that the vehicle should go straight, and the angle difference is the predetermined angle. This is a method of determining that a right turn or a left turn should be made when it exceeds. If the destination direction data is not "invalid" in step S44, then in step S46, from the destination direction data of FIG. 2 (E), go straight, rightward, diagonally rightward, return to right, leftward, diagonally leftward, leftward. Gets the direction of travel, which is the direction to return to

FIG. 10 is a flowchart showing the flow of the auxiliary guidance setting process in step S34 of FIG. 7, and FIG. 11 is a diagram for explaining an example of the process. First, step S5
In step 1, the destination name of the road exiting from the branch point 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 of the road exiting from the branch point from the guide road data of the destination road (exit road) of FIG. 2A is used as the road guide auxiliary information data of FIG. 3A. Obtained from road attribute data. For example, in FIG. 11, first, the road attribute of the road with the road number 3 that exits from the guidance branch point is acquired. Next, in step S53, it is verified whether or not the road attribute data includes elevated or underpass data, and if there is elevated or underpass data, the flow advances to step S54 to perform elevated / underpass guidance setting processing.

If the data of the elevated road or the underpass is not on the road currently being verified, the process proceeds to step 56, where the end point of the road currently being verified from the guidance branch point (the end point side of the arrow in the guide road row in FIG. 11). Check whether the distance to) is more than a predetermined distance. If the distance is equal to or greater than the predetermined distance, the process proceeds to another process. If the distance is not equal to or greater than the predetermined distance, the next guide road string connected to the end point of the road currently undergoing verification in step 57 (currently verified in FIG. 11). When the existing road string is road number 3, the guide road data of road number 6) is acquired.

Next, in step S58, it is checked from the guide road data of the road to be connected whether or not guidance is required. That is, when the road with the road number 6 is connected to the road with the road number 3 as shown in FIG. 11, it is necessary to guide the road with the road number 6 at the connection branch point between the road numbers 3 and 6. To find out. If guidance is not required, that is, if guidance is required, proceed to the next process. If guidance is not required,
Returning to step 53, the road attribute data in the guide road data of road number 6 is searched. In this way, when the auxiliary guidance setting of the guidance branch point shown in FIG. 11 is performed, the road exiting from the guidance branch point has a road number 3 → 6 → 8 → ... Perform verification in order until there is a road train that requires guidance, or elevated / underpass data. In step 56, whether or not the distance from the guidance branch point to the road end point is equal to or greater than a predetermined distance is verified, but the predetermined distance may be a straight line distance or an actual distance of the guide route. . The processing shown in FIG. 10 represents the processing content of the determination means for determining whether or not to add the road guidance auxiliary information data (road attribute data) as the auxiliary guidance for the branch point guidance to the branch point guidance.

FIG. 12 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.

The above-mentioned auxiliary voice is the voice guidance that is determined by the angle difference, while the main voice is
It is a voice guidance performed by the determination based on the guide road data.

FIG. 13 is a diagram showing a concrete guidance scene and guidance expression of an elevated road and an underpass. FIG. 13A shows a case where there is one branch point within a predetermined distance (for example, 300 m).
"Pawn, about 300 meters ahead, to the left. Underpass (overpass)." Voice guidance was given, followed by "Soon to be left. Underpass (overpass). Please be careful." Be seen. FIG. 13B shows a case where there are a plurality of branch points within a predetermined distance.
0 meters ahead, to the left. Voice guidance will be given, followed by a voice guidance of "I will soon be in the right direction. After that, I will be in the left direction. Underpass (elevated). Please be careful."

FIGS. 13 (C) to 13 (E) show the case where the branch points within a predetermined distance are continuous, and in the case of FIG. 13 (C), "Pawn is about 300 meters ahead, to the right. The voice guidance will be given, followed by the voice that says "It will soon be to the right. After that, it will be to the left at 500 meters. It is an underpass (overpass). Please be careful."
In the case of Fig. 13 (D), the voice guidance "Pawn, about 300 meters ahead, to the right. Underpass (overpass)" is given, followed by "Soon to the right. Underpass (overpass). Beyond that, at 500 meters you will be on the left, please be careful. ” In the case of Fig. 13 (E), the voice guidance of "Pawn, about 300 meters ahead, to the right. Underpass (overpass)" is given, followed by "Soon to the right. Underpass (overpass). After that, 500 meters to the left, it is an underpass (elevated). Please be careful. ”

FIG. 14 is a diagram for explaining voice guidance at a branch point according to a concrete screen example. 14
FIG. 14A shows an example of guidance when there is an overpass in the direction straight ahead from the intersection, and FIG. 14B shows an example of guidance when there is a tunnel immediately in the direction of turning left from the intersection.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 15 is a diagram showing an example of a complicated intersection, and specifically shows an “Iidabashi” intersection having six intersections. At such a complicated intersection, it is difficult to understand the guidance only by the left and right guidance. Therefore, after guiding the traveling direction by voice, the direction name ~ displayed at the intersection is additionally voice-guided. Also, if there is no direction display at the intersection, a voice guidance is given that there is no direction name. This direction name is dataized as the destination name in the destination data of FIG. In addition, →, →, →,
→ indicates that entry is prohibited, and → and → do not get lost, so voice guidance is unnecessary.

FIG. 16 shows a modified example of the present invention and is a flow chart showing the flow of processing for changing the voice expression when a distance shift occurs. In the vehicular navigation device according to the present invention, when route guidance is performed, when the vehicle turns right or left at an intersection, the vehicle position on the map is corrected by a turn determination, and map matching is performed. If there is a long period of non-guidance, there is no chance of performing the correction. Therefore, if there is a period of no guidance for a predetermined distance or more, the vehicle position on the map may be displaced.

Therefore, when there is a section in which guidance is not performed for a predetermined distance or more, it is determined that there is a "distance deviation" and the voice output content can be changed. Therefore, as shown in FIG. 16, the guidance voice is divided into phrases such as pawn (guidance sound), guidance distance, intersection name, and heading direction, and can be changed for each phrase except the "pawn" phrase. Then, it is determined whether or not to output the voice for each phrase, and in particular, the guide voice is created by removing the phrase related to the guide distance such as "about 700 m ahead" or "about 300 m ahead". In addition, as a condition for determining the "distance deviation", in addition to the case where there is a section where guidance is not performed for a predetermined distance or more, or when the vehicle travels on a searched route out of a location not stored in the database (such as a parking lot) In the case of, also, until the intersection is turned right or left to correct the position, it is regarded as "distance deviation" and the guidance voice is created.

As described above, according to the present invention, before the current position of the vehicle on the searched route reaches the branch point or intersection requiring guidance, the next step to be taken at the branch point or intersection. The direction is announced by voice and display. At this time, if there is a branch point with a complicated shape such that the traveling direction cannot be specified by voice expressions such as front-rear left-right, diagonal left-right, etc., on which road in front of the branch point a predetermined distance By informing the driver whether to proceed, the driver can surely proceed on the road that should be traveled. That is,
When there is an elevated road and a road next to it at the branch point, or an underpass and a road next to the underpass exist in parallel, or there is a complicated-shaped branch point as shown in FIG. In this case, the road information of the road to be advanced on the guide route, for example, an instruction such as an overpass, an underpass, a tunnel, etc., such as "go through an elevated road" or "go through an underpass", is a complicated branch point with many branches. It will be possible to reliably provide guidance in.

In particular, at a complicated branch point as shown in FIG. 17 or FIG. 14 (B), or at an intersection, when a more complicated branch point exists immediately after turning right or left as shown in FIG. When there is a branching point with a complicated shape during straight running, such as, (Because it is possible to visually recognize the presence of an elevated road or an underpass while traveling straight ahead, It is difficult for the driver to know the existence of an underpass or an elevated road, etc., and it may be overlooked by the notification of the display only. By notifying the driver of the existence of the points by voice in advance, it is possible to provide reliable guidance without panicking the driver.

In the present embodiment, the road information data of elevated roads, underpasses, tunnels, etc. is stored as road data in the information storage device. Alternatively, it may be stored in the information storage device as branch point data. However,
To store road information data as road data,
It is possible to easily store data indicating a connection state between roads such as entry prohibition information from one road to another road, and the amount of data can be smaller than that when stored as branch point data.

[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.

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

FIG. 11 is a diagram for explaining the process of FIG.

FIG. 12 is a flowchart showing a flow of processing of setting elevated road / underpass guidance in FIG. 10;

FIG. 13 is a diagram showing specific guidance scenes and guidance expressions for an elevated road and an underpass.

FIG. 14 is a diagram for explaining voice guidance at a branch point according to a specific screen example.

FIG. 15 is a diagram showing another example of the present invention and showing an example of a complicated intersection.

FIG. 16 is a flowchart showing a modified example of the present invention and showing a flow of processing for changing a voice expression when a distance shift occurs.

FIG. 17 is a diagram for explaining the problem of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input / output device, 2 ... Present position detection device, 3 ... Information storage device 4 ... Central processing unit, 11 ... Touch switch, 12 ... Display 16 ... Speaker, 40 ... CPU, 41 ... First ROM, 4
2 ... RAM 43 ... 2nd ROM, 44 ... Image memory, 45 ... Image processor 46 ... Voice processor, 47 ... Communication interface 48 ... Sensor input 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 means that stores all the data necessary for performing the route calculation, route calculation means that calculates the route based on the information input by the input means, and the information along the route calculated by the route calculation means. Guidance control means for reading the data stored in the storage means and outputting it to the output means, the information storage means stores road guidance auxiliary information data, and the guidance control means detects the current position detection means. If the determined current position is on the route currently being guided calculated by the route calculation means, the information storage unit stores the data on the branch point requiring guidance in front of the current position. There is a determination unit that reads from the data about the route stored in the row and determines whether to add the road guidance assistance information data to the guidance about the branch point that requires the guidance, and the determination unit determines the road guidance assistance. A vehicle navigation device characterized in that when it is determined to add information data to the guidance regarding the branch point, road guidance auxiliary information data is added to the guidance regarding the branch point and output to the output means. 2. The determination means searches, within a predetermined distance ahead of a branch point where the guidance is required, from the data regarding the route calculated by the route calculation means and stored in the information storage means, 2. The vehicle navigation device according to claim 1, wherein when the data includes the road guidance auxiliary information data, it is determined that the road guidance auxiliary information data is added to the guidance regarding the branch point. 3. The information storage means stores the data necessary for performing the route guidance corresponding to each road connecting each branch point, and the route calculated by the route calculation means as a road string. The determination means stores, in the data stored in the road train of the route, a road train within a predetermined distance ahead of the branch point requiring the guidance, or data of a road train extending over the predetermined distance. 3. The vehicular navigation device according to claim 2, wherein it is determined that the road guidance auxiliary information data is added to the guidance regarding the branch point when the road guidance auxiliary information data is present in the vehicle. 4. The determining means determines that the road guidance auxiliary information data is searched in the order of proximity from a branch point, and the road guidance auxiliary information data searched first is added to the guidance regarding the branch point. The vehicle navigation device according to claim 2 or 3. 5. The vehicle navigation according to claim 1, wherein the road guidance auxiliary information data is an elevation, a side of an elevated road, an underpass, a side of an underpass, or a direction name of an approaching direction at a branch point. apparatus.