JP2006275617A - Navigation system, and its method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation system, a method, and a program capable of accurately grasping the situation from the position of a vehicle on board, the system up to a guide spot, and reporting appropriate information on a guide spot just before coming to the guide spot. <P>SOLUTION: A deviation risk judgment section 45 judges whether the time to be required up to reaching the guide spot is long or short depending on the difference in the running speed of the vehicle, on the basis of the running speed of the vehicle detected by a vehicle speed detector 3, in addition to the existence or nonexistence of a non-route path(s) having a deviation risk(s). A section 46, which selects a guide spot, selects guide spot information according to the magnitude of the deviation risk judged by the judgment section 45, and when the judgment section 45 judges that a non-route path(s) having a deviation risk(s) exists between the vehicle position and the guide spot, the selection section 46 selects guide spot information comprising the number of crossings or signals (for example, guide spot information having an expression such as "at the second signal", "at the second crossing") from information in a guide-spot information storage section 44. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a navigation technique for notifying guidance point information related to a guidance point before the guidance point, and more particularly to a navigation technique for changing the contents of the guidance point information in consideration of the situation until reaching the guidance point.

  In general, in navigation devices such as in-vehicle use, a point search is performed from a point database recorded on a storage medium such as a CD-ROM or a point on a map arbitrarily selected by a user, and a desired destination is designated. To do. Then, the vehicle position is detected as the current location, and a guidance route from this location to the destination is searched.

  When searching for a guidance route, while reading road data from a storage medium such as a CD-ROM, the route search is performed using a route search algorithm such as Dijkstra method, and from the detected vehicle position to the specified destination Is calculated based on the road data to create route data.

  Subsequently, the guidance route toward the destination and the position of the vehicle are superimposed and displayed on the display, the guidance route is guided based on the route data, and the direction guidance is performed by the synthesized voice from the speaker. By using such a navigation device, the user can reliably reach the destination from the departure place without following the guidance route.

  Such navigation devices are widely used as in-vehicle devices, and accordingly, various functions are incorporated in the navigation devices. For example, when the guidance point on the guidance route approaches the position of the host vehicle, the guidance point information such as the direction of travel at this guidance point, that is, the guidance direction, and how much distance is left to the guidance point is provided. A device having a function of informing the user is known. Specifically, in the case of ordinary roads, when the distance from the vehicle position to the guide point approaches 700m, 300m, and 100m in order, the distance to the intersection, the direction of guidance, and the direction name associated therewith are reported. It has become. That is, at the passing points of each distance, guidance point information such as “approximately 700 m ahead, left direction”, “approximately 300 m ahead, left direction”, “soon, left direction” is notified by voice guidance.

Further, in the technique described in Patent Document 1, even when the voice data of the driving guide cannot be read at the driving guidance timing, some guidance voice is generated and the traveling direction at the next guidance intersection can be recognized from the destination route. It is what I did. According to this technology, when the guidance timing (for example, when the distance to the next guidance point becomes 700 m, 300 m, 100 m, etc.), the voice data of the driving guidance has been normally read from the CD-ROM. If it is determined that the reading of the voice data is abnormal, a voice guidance with no directionality (for example, a guidance of “I am a good branch”) is generated to alert the driver. be able to.
JP-A-8-235992

  By the way, the process of referring to the road connection relationship from the intersection on the guidance route obtained by the route search and storing the intersection information in the allocated area on the DRAM is called guidance development. The intersection information stored by the guidance development is arranged in the order of the route regardless of whether or not the intersection is a guidance intersection where the guidance point information flows. FIG. 3 is an example of an image diagram of stored intersection information. Here, there is an intersection C2 having a non-route that turns in the same direction as the intersection C3 when the vehicle position approaches 100m to the intersection C3, which is the nearest guide point. Here, if the guide point information such as “Soon, it is the left direction” is performed, the user may accidentally turn left at the intersection C2 (see FIG. 4).

  Further, the contents of the guide point information may be different depending on the traveling speed of the own vehicle. In other words, the user may be confused when the same guide point information flows even though the time required to reach the guide point is different. Specifically, when the traveling speed of the vehicle is 60 km / h, the guide point 100 m ahead is reached in about 6 seconds. For this reason, it is appropriate to notify the guide point information with a content such as “Soon, left direction” when approaching within 100 m.

  However, when the traveling speed of the host vehicle is 10 km / h, it takes about 36 seconds to reach the intersection 100 m ahead. In this case, the guide point information having the expression “soon” is inappropriate, and the user may misplace the guide intersection. Furthermore, if the traveling speed of the vehicle is extremely low due to traffic jams on the road, this uncomfortable feeling will become stronger and the risk of leaving the guidance route will increase. When the vehicle travels in the wrong direction, the navigation device starts re-guidance to immediately return to the correct guidance route, which was originally unnecessary for the user and felt troublesome.

  As described above, in the conventional navigation device, the guide point information of the same content is mechanically notified before the guide point without considering the change in the situation from the vehicle position to the guide point. There is a risk that the user may deviate from the guidance route by mistake in the guide point.

  The present invention has been proposed in order to solve the above problems, and its purpose is to accurately grasp the situation from the vehicle position to the guide point, and to provide appropriate guide point information before the guide point. And providing a highly reliable navigation apparatus, method, and program capable of reliably reaching the guide point.

  In order to achieve the above-described object, the invention of claim 1 is directed to a guide route calculating means for calculating a guide route from the vehicle position to the destination, and a guide direction for notifying a guide direction at a guide point on the guide route. In a navigation device comprising notifying means and guide point information notifying means for notifying that the guide point is approaching the host vehicle position before the guide point, until reaching the guide point from the host vehicle position A guide point information storage means for storing a plurality of guide point information having different contents with respect to the situation of the vehicle, and a deviation for judging the magnitude of a deviation risk deviating from the guide route according to the situation from the vehicle position to the guide point The plan according to the magnitude of the departure risk determined by the departure risk determination means from the risk determination means and the plurality of types of guide point information stored in the guide point information storage means And guiding point information selecting means for selecting location information, characterized by comprising a.

  The invention of claim 6 captures the invention of claim 1 from the viewpoint of the method, and uses a computer to calculate a guide route from the vehicle position to the destination, A navigation method including a guidance direction notifying step for notifying a guide direction at a guide point on the guide route, and a guide point information notifying step for notifying that the guide point is approaching the vehicle position before the guide point. In accordance with the situation from the own vehicle position to the guide point, and the guide point information storage step for storing a plurality of guide point information having different contents with respect to the situation from the own vehicle position to the guide point. Deviation risk judgment step for judging the magnitude of deviation risk deviating from the guide route, and a plurality of types of guidance point information stored in the guidance point information storage step. From among, it is characterized in that it comprises a guiding point information selection step of selecting the guiding point information in accordance with the magnitude of the departure risk is determined by the deviation risk judgment step.

  Furthermore, the invention of claim 7 relates to the navigation apparatus and method according to the inventions of claims 1 and 6, which are grasped from the viewpoint of a program, and from a vehicle position to a destination by using a computer. A guide route calculation function for calculating the guide route, a guide direction notification function for notifying the guide direction at the guide point on the guide route, and the guide point approaching the vehicle position before the guide point. In a navigation program for causing a computer to implement a guide point information notification function for notifying a vehicle, a guide point information storage function for storing a plurality of guide point information having different contents regarding the situation from the vehicle position to the guide point; Deviation risk judgment that determines the magnitude of deviation risk that deviates from the guidance route according to the situation from the vehicle position to the guide point. A guide point that selects the guide point information according to the magnitude of the departure risk determined by the departure risk determination function from among a plurality of types of guide point information stored by the function and the guide point information storage function The information selection function is realized by a computer.

  In the inventions of claims 1, 6, and 7 having the above-described configuration, a plurality of pieces of guide point information having different contents regarding the situation from the vehicle position to the guide point are stored in advance, and the guide point information The guide point information is selected and notified according to the magnitude of the deviation risk from the inside to the guide point. That is, if there is a high risk of deviating from the route before reaching the guidance point, the guidance point information corresponding to this can be transmitted to the user. Therefore, in proportion to the magnitude of the departure risk, it is possible to notify the guide point information that alerts the corresponding attention, and the user does not have to worry about being out of the guidance route. As a result, it is possible to reliably reach the guidance point, and to follow the correct route along the guidance guidance.

  According to a second aspect of the present invention, in the navigation device according to the first aspect, an intersection information storage unit that stores intersection information on the guidance route, and an intersection information acquisition unit that acquires the intersection information from the intersection information storage unit, The deviation risk determination means is based on the intersection information acquired by the intersection information acquisition means, and the traveling direction to be guided at the guidance point from the vehicle position to the guidance point It is characterized in that it is determined whether or not there is a non-path that can travel in a direction that may be mistaken.

  In the invention of claim 2, when there is a non-route that may be mistaken as a guide point, such as a road extending in the same direction as the guidance direction at the guide point, in the middle from the vehicle position to the guide point, Since the risk judging means detects this, the guide point information selecting means can give the user guide point information that does not mistake the point including the non-route and the original guide point based on the judgment. it can. For example, in the case of the example shown in FIG. 4, “Soon, left direction”, the user may accidentally turn left at the intersection C2. Therefore, the guide point information with the content “For a while, left” is selected and notified. Thereby, it does not enter the intersection which is not a guide point, and it can prevent reaching to a guide point reliably.

  According to a third aspect of the present invention, in the navigation device according to the first or second aspect, the guidance point information storage means adds information related to the number of intersections or signals from the vehicle position to the guidance point. The point information is stored, and when the departure risk determination means determines that the departure risk is high from the vehicle position to the guide point, the guide point information selection means It is characterized by selecting guide point information to which information related to numbers is added.

  In such a third aspect of the invention, when there is a non-route having a deviation risk that may be mistaken as a guide point in the middle from the vehicle position to the guide point, the vehicle reaches the guide point from the vehicle position. Guidance point information to which information related to the number of intersections or the number of traffic signals is added to the user. Therefore, the user can reach the guide point more reliably by counting the number of intersections or the number of signals, and there is no fear of deviating from the guidance route. As a modification of the example shown in FIG. 4, assume that the intersection C2 and the intersection C3 are very close. Even in this case, by notifying the guide point information that “the second intersection is in the left direction”, it is not possible to enter the intersection C2 side that is not the guide point, and even to the intersection C3 that is the guide point. You can reach it reliably.

  According to a fourth aspect of the present invention, in the navigation device according to any one of the first to third aspects of the present invention, the navigation device further includes speed detection means for detecting a traveling speed of the host vehicle, and the departure risk determination means includes the speed detection means. Based on the detected traveling speed of the host vehicle, it is possible to determine the length of time until the vehicle reaches the guide point due to a difference in the traveling speed of the host vehicle. Is stored in a short time from the vehicle position to the guide point, and the guide point information when it takes a long time to reach the guide point. When it is determined that the arrival time until the vehicle arrives is short, the guide point information selecting unit selects the guide point information when it arrives in a short time, and the deviation risk determining unit moves from the vehicle position to the guide point. To When the time to reach is determined that long, the guide point information selection device is characterized in that is adapted to select a guidance point information when reaching suffering long.

  In the invention of claim 4, the departure risk determination means determines the departure risk caused by the time change until reaching the guide point due to the difference in the traveling speed of the own vehicle. That is, when the traveling speed of the host vehicle is sufficiently high to reach the guide point in a short time, information corresponding to this, for example, guide point information having the expression “soon” is notified. On the other hand, when the traveling speed of the host vehicle is slow and it takes a long time to reach the guidance point, information corresponding to this, for example, guidance point information having the expression “for a while” is reported. In this way, even if the time required to reach the guidance intersection changes due to the difference in the traveling speed of the own vehicle, the guidance point information of the content corresponding to the time can be notified, so the user does not feel uncomfortable. It is possible to accept the point information honestly. Therefore, it is possible to reach the guide point with certainty without turning before the guide point and leaving the guide route or passing through the guide point.

  According to a fifth aspect of the present invention, in the navigation device according to any one of the first to fourth aspects, the guidance point information notifying means guides n times during a period from the vehicle position to the guidance point. Point information is reported, and only when the guide point information notifying unit notifies the nth guide point information, the guide information selecting unit selects the guide point information. It is characterized by.

  When the user is sufficiently away from the guidance point, there is no need to convey detailed guidance point information to the user, and simple guidance point information sufficient to make the user aware that there is a guidance point on the guidance route is sufficient. . In other words, in the fifth aspect of the invention, when the guide point information is notified n times before reaching the guide point, the guide point information is displayed only at the nth time when the guide point information is notified at the timing closest to the guide point. Select guide point information according to the road conditions to reach. The notification of the guide point information at a timing at a distance from the other guide points is limited to the single guide point information regardless of the road conditions until the guide point is reached. Thereby, the guide point information when the user is sufficiently away from the guide point can be simple. As a result, there is no worry of confusing the user due to excessive information.

  As described above, according to the navigation apparatus, method and program of the present invention, the situation from the vehicle position to the guide point is accurately grasped, and appropriate guide point information is notified before the guide point. Therefore, it is possible to reliably reach the guide point without deviating from the guidance route, and the reliability of the navigation technology can be improved.

  Next, the best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be specifically described with reference to the drawings. In addition, although this embodiment is realizable by controlling the computer provided with the peripheral device by the program, the realization aspect of the hardware and program in this case can be changed variously, and also for map data and route calculation The algorithm can also be selected as appropriate.

  In addition to the navigation apparatus and method, the present invention can be grasped as the above-mentioned program and a computer-readable recording medium recording the program. This program is a physical program such as a CPU and various chipsets incorporated in the navigation apparatus. The effect of this invention is implement | achieved by utilizing a processing apparatus.

[1. Constitution〕
[1-1. Overall configuration)
Each element of this embodiment is demonstrated using the functional block diagram of FIG. Each element includes an absolute position / orientation detection unit 1, a relative orientation detection unit 2, a vehicle speed detection unit 3, a main CPU and its peripheral circuit 4, a memory group M, an output unit 10, and an input unit 11. A disk control unit 12, an FM multiplex reception and processing unit 13, and an optical / beacon reception and processing unit.

  Among them, the absolute position / orientation detection unit 1 receives the GPS radio wave transmitted from the GPS satellite with an antenna, a receiver, or the like, so that the position of the vehicle that is the current location of the vehicle on which the apparatus is installed is This is the part that calculates absolute position coordinates and direction. The relative orientation detection unit 2 is a part that detects the relative orientation of the host vehicle using a gyro sensor or the like. The vehicle speed detection part 3 is a part which calculates the speed of the own vehicle by processing the vehicle speed pulse obtained from the own vehicle.

  Further, the main CPU and its peripheral circuit 4 are parts that serve as a control circuit for controlling the entire apparatus of the present embodiment. The memory group M is provided with ROM 5, DRAM 6, SRAM 7, and VRAM 8. Of these, the ROM 5 stores a BIOS, a boot-up program, and the like in advance, and is accessed by the main CPU and its peripheral circuit 4 when the apparatus is activated. The DRAM 6 is used for a work area and the like. The SRAM 7 is a non-volatile memory, and retains the memory contents by being backed up by a battery or the like even when the main power source of the apparatus such as an accessory power source of the own vehicle is turned off. The VRAM 8 is a memory for performing video display on the output unit 10.

  The output unit 10 displays the searched guidance route and the like on the screen, informs the guidance direction at the guidance point on the guidance route, and indicates that the guidance point is approaching the vehicle position before the guidance point. It is a part which performs notification of the guide point information to represent. The input unit 11 is a part for the user to input various information such as commands and destinations to the apparatus using a remote controller, a touch panel, or the like. The user interface unit 9 is a user interface that connects the output unit 10 and the input unit 11 to the main CPU and its peripheral circuit 4 using an I / O control circuit, a driver, or the like.

  The disk controller 12 is means for reading various data such as navigation programs and map data including intersection information and road information from a database recorded on a disk such as a hard disk or a CD-ROM. The FM multiplex reception and processing unit 13 receives a FM broadcast wave of radio by switching a plurality of antennas according to the reception state, and obtains VICS information from this broadcast wave, an optical / beacon reception and processing unit 14 Is the part that receives the light / beacon signal and processes this signal.

[1-2. Role of main CPU and its peripheral circuits]
Further, the main CPU and its peripheral circuit 4 include a host vehicle position specifying unit 40, a destination specifying unit 41, a route calculating unit 42, a guidance control unit 43, a guidance point information storage unit 44, a departure risk determination unit 45, and guidance point information. A selection unit 46 and an intersection information acquisition unit 47.

  Among these, the own vehicle position specifying unit 40 is a means for specifying the own vehicle position by sequentially calculating the own vehicle position by combining GPS navigation positioning and autonomous navigation positioning. The destination designation unit 41 is a part for designating a destination input by the user via the input unit 11 as a destination.

  The route calculation unit 42 performs route search using a route search algorithm such as Dijkstra method while reading out road data from a disk such as a CD-ROM using the disk control unit 12 and specified by the vehicle position specifying unit 40. This is a part for creating route data representing the guidance route by calculating the guidance route from the vehicle position to the destination designated by the destination designation unit 41 based on the map data.

  Further, the guidance control unit 43 is a means for controlling the guidance guidance by determining elements to be displayed and flashing emphasis in the guidance route or by using combined speech. The vehicle position specifying unit 40, the destination specifying unit 41, the route calculating unit 42, and the guidance control unit 43 search for a guidance route to the specified destination based on the map data read from the disk control unit 12. In addition, navigation means for guiding and guiding this is configured.

[1-3. Characteristic part of this embodiment]
Subsequently, characteristic portions of the present embodiment will be described. The characteristic part of this embodiment is a part obtained by adding a guidance point information storage unit 44, a departure risk determination unit 45, a guidance point information selection unit 46, and an intersection information acquisition unit 47 to the guidance control unit 43.

  The guide point information storage unit 44 is a part that stores a plurality of pieces of guide point information having different contents regarding the situation from the vehicle position to the guide point. Specifically, the guide point information storage unit 44 adds guide point information (for example, the expression “second signal”) to which information on the number of intersections or the number of signals from the vehicle position to the guide point is added. Or guidance point information with the expression “second intersection”), guidance point information when it takes a short time to reach the guidance point (for example, guidance point information with the expression “soon”) In addition, the guide point information (for example, guide point information having an expression “for a while”) is stored when it takes a long time to reach the guide point.

  The departure risk determination unit 45 is a part that determines the magnitude of departure risk that deviates from the guidance route according to the situation from the vehicle position to the guidance point. More specifically, the departure information acquisition unit 47 acquires the departure risk. Determine whether there is a non-route that can travel in a direction that may be misidentified as a traveling direction to be guided at the guidance point from the vehicle position to the guidance point based on the intersection information It is supposed to be.

  Further, the departure risk determination unit 45 is based on the traveling speed of the own vehicle detected by the vehicle speed detection unit 3 in addition to the presence / absence of a non-route having a high departure risk, and guide points due to differences in the traveling speed of the own vehicle. Judgment of the length of time to reach.

  The guide point information selection unit 46 is a part that selects the guide point information according to the magnitude of the departure risk determined by the departure risk determination unit 45. When the departure risk determination unit 45 determines that there is a non-route with a high departure risk from the vehicle position to the guidance point, information on the number of intersections or the number of signals is added from the guidance point information storage unit 44. Guide point information (for example, guide point information having the expression “second signal” or “second intersection”) is selected.

  Further, when the departure risk determination unit 45 determines that the time until the vehicle reaches the guidance point is long, the guidance point information selection unit 46 reaches the guidance point from the guidance point information storage unit 44. The guide point information (for example, guide point information having the expression “a little ahead”) is selected when it takes a long time to complete. On the contrary, when the departure risk determination unit 45 determines that the time until the vehicle reaches the guidance point is short, the guidance point information selection unit 46 reaches the guidance point from the guidance point information storage unit 44. The guide point information (for example, guide point information having the expression “soon”) is selected when a short time is required.

  In this embodiment, when the distance from the vehicle position to the guide point approaches 700 m, 300 m, and 100 m, the guide point information is notified three times for convenience. At this time, only when notifying the third guide point information, the guide information selection unit 46 selects the guide point information.

[2. Action)
Next, the operation of this embodiment will be described. FIG. 2 is a flowchart showing a process of outputting guidance point information by voice guidance when the distance to the guidance point approaches 100 m. First, in STEP 1, it is confirmed whether or not the intersection has already performed voice guidance for guidance point information. If it is an intersection where voice guidance has already been performed (Yes in STEP 1), the process returns to STEP 1, and if voice guidance is not being performed (No in STEP 1), the process proceeds to STEP 2.

  In STEP2, it is confirmed whether or not the intersection (guidance point) where voice guidance is performed is approached within 100 m. If it is not approaching (No in STEP 2), the process returns to STEP 2, and if it is approaching (Yes in STEP 2), the process proceeds to STEP 3. In STEP 3, it is confirmed whether or not the host vehicle is traveling at a high speed exceeding, for example, 60 km / h. If the host vehicle is traveling at a high speed (Yes in STEP 3), the departure risk judging unit 45 reaches the guidance point. The guide point information selecting unit 46 determines that the guide point information (for example, “soon to reach the guide point” from the guide point information storage unit 44). Guide point information having the expression “)” is selected, and the guidance processing unit 43 provides voice guidance (STEP 5).

  On the other hand, if the host vehicle is not traveling at high speed in STEP 3 (No in STEP 3), the process proceeds to STEP 4. In STEP4, based on the intersection information acquired by the intersection information acquisition unit 47, the departure risk determination unit 45 may mistakenly recognize the traveling direction to be guided at the guidance point before reaching the guidance point from the own vehicle position. Determine if there is a non-path with a risk of deviation that can travel in a certain direction.

  Here, if the departure risk determination unit 45 determines that there is no non-route having a departure risk at the guide point from the vehicle position to the guide point (No in STEP 4), the departure risk. The determination unit 45 simply determines that the time until the vehicle reaches the guidance point is long. At this time, the guide point information selecting unit 46 guides the guide point information (for example, the guide having the expression “for a while”) when it takes a long time to reach the guide point from the guide point information storage unit 44. Point information) is selected, and the guidance processing unit 43 provides voice guidance (STEP 6).

  In STEP 4, when the departure risk determination unit 45 determines that there is a non-route having a departure risk at the guide point from the vehicle position to the guide point (Yes in STEP 4), the guide point information The selection unit 46 provides guidance point information (for example, an expression “second signal” or “second intersection”) that includes information on the number of intersections or the number of signals from the guidance point information storage unit 44. (Guide point information with expression) is selected, and the guidance processing unit 43 provides voice guidance (STEP 7).

[3. effect〕
According to the present embodiment as described above, there is a risk of deviation from the presence of a non-route that may be mistaken for a guide point in the middle from the vehicle position to the guide point, and the length of time to reach the guide point. Based on the determination by the determination unit 45, the guide point information selection unit 46 can provide the user with guide point information having a content that does not mistake the point including the deviation risk and the original guide point. . Moreover, in the present embodiment, even if there is a non-route that may be misidentified as a guide point by approaching the guide point, information on the number of intersections or the number of signals from the vehicle position to the guide point Since the user is notified of the guide point information with the added number, the user is less likely to mistake the point including the non-route and the guide point by counting the number of intersections or the number of signals, and there is a fear of deviating from the guide route. Absent.

  Furthermore, in this embodiment, the guide point information is selected in accordance with the road conditions until the guide point is reached only at the third time when approaching within 100 m in which the guide point information is notified at the timing closest to the guide point. is doing. Therefore, the guide point information to be notified when the user is sufficiently away from the guide point within 700 m or within 300 m may be simple and may give the user excessive information and confuse the user. There is no.

[4. Other embodiments]
In addition, this invention is not limited to the said embodiment, The content in guidance point information, the notification timing of a guidance point information, the frequency | count of notification, etc. can be changed suitably. Furthermore, a medium for storing such information is not limited to a disk such as a CD or a DVD, but a portable memory card can also be used.

The functional block diagram which shows the structure of embodiment which concerns on this invention. The flowchart of this embodiment. The storage image figure of the conventional intersection information. Explanatory drawing which shows the conventional subject.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Absolute position and direction detection part 2 ... Relative direction detection part 3 ... Vehicle speed detection part 4 ... Main CPU and its peripheral circuit 5 ... ROM
6 ... DRAM
7 ... SRAM
8 ... VRAM
DESCRIPTION OF SYMBOLS 9 ... User interface part 10 ... Output part 11 ... Input part 12 ... Disk control part 13 ... FM multiplex reception and processing part 40 ... Own vehicle position specification part 41 ... Destination designation part 42 ... Route calculation part 43 ... Guidance control part 44 ... Guide point information storage unit 45 ... Deviation risk determination unit 46 ... Guide point information selection unit 47 ... Intersection information acquisition unit M ... Memory group a ... Own vehicle marks C1 to C3 ... Intersection

Claims (7)

Guide route calculation means for calculating a guide route from the vehicle position to the destination, guidance direction notification means for notifying the guide direction at the guide point on the guide route, and the guide point before the guide point In a navigation device comprising guidance point information notification means for notifying that the position is approaching,
Guidance point information storage means for storing a plurality of guidance point information having different contents regarding the situation from the vehicle position to the guidance point;
Deviation risk judgment means for judging the magnitude of deviation risk that deviates from the guidance route according to the situation from the vehicle position to the guide point;
Guidance point information selection means for selecting the guidance point information according to the magnitude of the departure risk determined by the departure risk determination means from among a plurality of types of guidance point information stored in the guidance point information storage means; A navigation device characterized by comprising: Intersection information storage means for storing intersection information on the guidance route;
Intersection information acquisition means for acquiring the intersection information from the intersection information storage means,
The deviation risk judging means may misidentify a traveling direction to be guided at the guidance point from the vehicle position to the guidance point based on the intersection information obtained by the intersection information obtaining means. 2. The navigation apparatus according to claim 1, wherein it is determined whether or not there is a non-path that can travel in a certain direction. The guide point information storage means stores guide point information including information on the number of intersections or the number of signals from the vehicle position to the guide point,
When the departure risk determination means determines that the departure risk is large before reaching the guidance point from the own vehicle position, the guidance point information selection means adds the guidance point information to which information on the number of intersections or the number of signals is added. The navigation device according to claim 1, wherein the navigation device is selected. Provided with a speed detecting means for detecting the traveling speed of the own vehicle;
The deviation risk judging means judges the length of time to reach the guide point due to the difference in the traveling speed of the own vehicle based on the traveling speed of the own vehicle detected by the speed detecting means. ,
The guidance point information storage means stores guidance point information when reaching in a short time from the vehicle position to the guidance point, and guidance point information when reaching over a long time,
When the departure risk determination means determines that the arrival time from the vehicle position to the guidance point is short, the guidance point information selection means selects the guidance point information when it arrives in a short time, and When the departure risk determination means determines that the arrival time from the vehicle position to the guidance point is long, the guidance point information selection means selects the guidance point information when it takes a long time to arrive. The navigation device according to any one of claims 1 to 3, wherein the navigation device is configured. The guide point information notifying means is configured to notify the guide point information n times from the vehicle position to the guide point,
5. The guide information selecting unit selects the guide point information only when the guide point information notifying unit notifies the nth guide point information. The navigation device according to claim 1. By using a computer, a guide route calculating step for calculating a guide route from the vehicle position to the destination, a guide direction notifying step for notifying a guide direction at a guide point on the guide route, and a front of the guide point In a navigation method including a guide point information notifying step for notifying that the guide point is approaching the own vehicle position,
A guide point information storing step for storing a plurality of guide point information having different contents regarding the situation from the vehicle position to the guide point;
Deviation risk judgment step for judging the magnitude of deviation risk that deviates from the guidance route according to the situation from the vehicle position to the guide point;
Guidance point information selection step for selecting the guidance point information according to the magnitude of the departure risk determined in the departure risk determination step from among a plurality of types of guide point information stored in the guidance point information storage step. And a navigation method comprising: By using a computer, a guidance route calculation function for calculating the guidance route from the vehicle position to the destination, a guidance direction notification function for notifying the guidance direction at the guidance point on the guidance route, and the front of the guidance point In a navigation program for causing a computer to realize a guide point information notification function for notifying that the guide point is approaching the vehicle position,
A guide point information storage function for storing a plurality of guide point information having different contents regarding the situation from the vehicle position to the guide point;
A deviation risk judgment function for judging the magnitude of the deviation risk that deviates from the guidance route according to the situation from the vehicle position to the guide point,
A guide point information selection function for selecting the guide point information according to the magnitude of the departure risk determined by the departure risk determination function from a plurality of types of guide point information stored by the guide point information storage function A navigation program characterized in that a computer is realized.

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