JP5012642B2 - NAVIGATION DEVICE AND NAVIGATION DEVICE PROGRAM - Google Patents

Description

  The present invention relates to a navigation device and a program for the navigation device.

Conventionally, a navigation device that calculates a guide route to a destination selects an optimum guide route based on a required time to the destination, a toll amount, weather information, and the like (for example, patents) Reference 1).
JP 2006-337182 A

  However, conventional navigation devices select guidance routes for roads that are likely to be closed due to natural disasters such as river flooding, land subsidence, landslides, and avalanches. Not. Therefore, even if the vehicle is driven according to the guidance route, there is a possibility that the user may feel uneasy that the road may be closed due to a natural disaster.

  In view of the above, an object of the present invention is to provide a guidance route selection technique in consideration of the existence of a road that is highly likely to be closed due to a natural disaster in a navigation device.

In the inventions according to claims 1, 3, and 5 for achieving the above object, the navigation device that calculates the guidance route to the destination and presents it to the user has a plurality of road closures due to natural disasters in the past. For each point, record information on the natural environment of the point at the time of the occurrence of the natural disaster that caused the closure of the traffic (hereinafter referred to as the natural environment at the time of the disaster), and the current nature of each of these points Acquire environmental information, and from those multiple points, extract the points where the recorded natural environment at the time of disaster matches the acquired current natural environment as dangerous points, and pass through one or more of the extracted dangerous points A safe route that does not pass through any of the dangerous points is preferentially selected as a guide route over a dangerous route.

  In this way, when the natural environment (weather, the presence or absence of an earthquake, the season, etc.) at the time of a natural disaster at multiple points that have been closed due to natural disasters in the past matches the current natural environment at that point, Guidance in consideration of the presence of roads that are likely to be closed due to natural disasters by preferentially selecting a safe route that does not pass through any of these dangerous points as a guide route. A route can be selected.

In addition, as described in claim 1 , the navigation device selects the dangerous route as the guidance route based on the fact that the time required for traveling on the safe route exceeds the reference value. Information indicating that the point is passed may be presented.

Further, as described in claims 2 and 3 , the navigation device recommends the safe route and the dangerous route as the guidance route based on the fact that the time required for traveling on the safe route exceeds the reference value. Both of them may be presented, and information about passing through the danger point may be presented for the dangerous route.

Such operations of claims 1, 2, and 3 are appropriate even if there is a certain degree of danger, even if it is a safe route, rather than selecting a route that makes a detour that takes too much time as a guide route. This is based on the idea that selecting a dangerous route that can reach the destination in time may satisfy the user's needs. And even if it is a dangerous route, if the user is also presented with information indicating that it passes the dangerous point, the user can determine whether or not the dangerous route is taken based on the information.

In addition, as described in claim 6 , even when a certain route is not on the road to which the dangerous point belongs, the navigation device can detect the route as a dangerous point if the route is within the reference distance from the dangerous point. It may be considered to pass through. By doing in this way, it becomes possible to select a route in consideration of the possibility that a natural disaster at a dangerous point may reach the surrounding roads.

In addition, as described in claim 7 , the navigation device acquires the natural environment information for the reference period retroactively from each of the plurality of points, and records the recorded information from the plurality of recorded points. A point where the natural environment at the time of a disaster and at least one of the natural environments in the reference period may be extracted as a dangerous point.

  This is because a natural environment (such as rain) that leads to a natural disaster (such as a landslide) may occur several days before the occurrence of the natural disaster. By doing in this way, the predictability of a natural disaster can be made higher in the guidance route selection in consideration of the possibility of a road closure due to a natural disaster.

In addition, as described in claims 4 and 5 , the navigation device may calculate a plurality of candidate routes that are candidates for the guidance route to the destination. In that case, the navigation device provides information on the frequency of the closure of the natural disaster for each of the plurality of points along with the information on the natural environment at the time of the disaster for each of the plurality of the points that have been closed due to a natural disaster in the past. It may be recorded.

  Further, the navigation device is configured to select the most of the plurality of candidate routes based on the frequency information related to the recorded dangerous points when all of the plurality of candidate routes are dangerous routes that pass through one or more of the extracted dangerous points. A candidate route with a high degree of safety may be selected as a guidance route.

  As described above, the navigation device selects the candidate route with the highest safety level as the guide route using the information on the occurrence frequency of the disaster at the dangerous point even when the candidate routes are all dangerous routes. Thus, a relatively safe route can be used as the guidance route.

Further, as described in claims 8 , 9, and 10 , the features of the navigation device according to claims 1, 3, and 5 can also be understood as features of a program for the navigation device.

  In addition, the code | symbol in the bracket | parenthesis in the said and the claim shows the correspondence of the term described in the claim, and the concrete thing etc. which illustrate the said term described in embodiment mentioned later. .

  Hereinafter, an embodiment of the present invention will be described. FIG. 1 shows a hardware configuration of a vehicle navigation apparatus 1 according to this embodiment. The vehicle navigation apparatus 1 includes a position detector 11, an image display device 12, an operation unit 13, a speaker 14, a weather / disaster information receiver 15, a map data acquisition unit 16, and a control circuit 17.

  The position detector 11 has a well-known acceleration sensor, geomagnetic sensor, gyro sensor, vehicle speed sensor, GPS receiver, and other sensors (not shown), and based on the characteristics of each of these sensors, Information for specifying the position, orientation, and speed is output to the control circuit 17.

  The image display device 12 displays a video based on the video signal output from the control circuit 17 to a user (driver or the like). Examples of the display image include a map centering on the current location.

  The operation unit 13 includes a plurality of mechanical switches provided in the vehicle navigation device 1 and an input device such as a touch panel provided on the display surface of the image display device 12. The user presses the mechanical switch and touches the touch panel. Is output to the control circuit 17.

  The weather / disaster information receiver 15 periodically receives weather / disaster information wirelessly transmitted from an FM radio broadcasting station or a roadside device installed along the road, and outputs the weather / disaster information to the control circuit 17. The received weather / disaster information includes natural disaster information, current weather information at each location, current earthquake information at each location, and current weather warning information at each location.

  Natural disaster information is information related to closures caused by natural disasters, (1) the location of the location where the closure occurred, (2) the type of natural disaster that caused the closure, and (3) the occurrence of the natural disaster. (4) Information on the presence or absence of an earthquake at the point at the time of occurrence of the natural disaster. Here, natural disasters refer to natural disasters that can directly cause traffic closure, such as avalanches, landslides, land subsidence, and river flooding.

  The map data acquisition unit 16 includes a nonvolatile writable storage medium such as an HDD and a device that reads data from the storage medium. The storage medium stores a program executed by the control circuit 17, map data for route guidance, and the like.

  The map data has road data and facility data. The road data includes link position information, type information, node position information, type information, information on connection relations between nodes and links, and the like. The facility data has a plurality of records for each facility, and each record has data indicating name information, location information, land lot number information, facility type information, and the like of the target facility.

  A control circuit (corresponding to a computer) 17 is a microcomputer having a CPU, RAM, ROM, I / O and the like. The CPU executes a program for the operation of the vehicle navigation device 1 read from the ROM or the map data acquisition unit 16, reads information from the RAM, the ROM, and the map data acquisition unit 16 when executing the program. Information is written to the storage medium of the map data acquisition unit 16, and signals are exchanged with the position detector 11, the image display device 12, the operation unit 13, the speaker 14, and the weather / disaster information receiver 15.

  Specific processing performed by the control circuit 17 executing the program includes current position specifying processing, weather / disaster information recording processing, map display processing, guidance route calculation processing, route guidance processing, and the like.

  The weather / disaster information recording process is a process of recording the weather / disaster information received from the weather / disaster information receiver 15 in the storage medium of the map data acquisition unit 16. For this weather / disaster information recording process, the control circuit 17 periodically acquires the weather / disaster information from the weather / disaster information receiver 15 by executing the program 100 shown in FIG. 2 (step 110). The acquired weather / disaster information is recorded in the storage medium (step 120).

  The recording method of the weather / disaster information in step 120 is as follows. For the weather information of each location in the weather / disaster information acquired from the weather / disaster information receiver 15, the control circuit 17 obtains the date of acquisition, the weather at the time of acquisition, and information on the area subject to the weather. A plurality of sets are recorded.

  Further, the natural disaster information in the weather / disaster information acquired from the weather / disaster information receiver 15 is recorded in the storage medium in a format as shown in FIG. That is, for each traffic stop point, (1) the type of natural disaster that occurred at the point, (2) the weather at the point when the natural disaster occurred at the point, and (3) the natural disaster at the point. (4) Season when the natural disaster occurred at the point, (5) Weather warning when the natural disaster occurred at the point, (6) The point Record the occurrence rate of the natural disaster in Japan.

  If the same natural disaster has occurred multiple times at that point, the weather information in (2) should be recorded as the weather at that point when the natural disaster occurred at that point. It may be configured to record only the latest weather or only the most frequent weather may be recorded.

  Also, if the same natural disaster has occurred multiple times at that point, the information on the presence or absence of an earthquake in (3) records all the occurrences of the earthquake at that point when the natural disaster occurred at that point. You may be able to record only the presence or absence of the most recent earthquake, or you may be recording only the most frequent of earthquakes or not Good.

  In addition, if the same natural disaster has occurred multiple times at the point, record all the seasons at the point when the natural disaster occurred at the point as the seasonal information in (4). It is possible to record only the latest season, or to record only the most frequent season.

  If the same natural disaster has occurred multiple times at the point, the weather warning information of (5) includes all the weather warnings at the point when the natural disaster occurred at the point (weather warning May also be recorded), or only the latest weather alert (or no weather alert) may be recorded, or the most frequent weather Only an alarm (or absence of a weather alarm) may be recorded.

  The occurrence rate of (6) calculates the frequency of occurrence of the natural disaster at the point in days. For example, when it occurs only once a year, the occurrence rate is once / 365 days = 0.27%.

  By executing such a program 100, the control circuit 17 can determine the type of natural disaster that has occurred and the occurrence of a natural disaster that has caused the closure for each of a plurality of points that have been closed due to a natural disaster in the past. Record the natural environment (ie, weather, presence / absence of earthquake, season) and the frequency of occurrence of natural disasters causing traffic closure.

  The current position specifying process is a process for specifying the current position and direction of the vehicle based on a signal from the position detector 11 using a known technique such as map matching.

  The map display process is a process for causing the image display device 12 to display a map of a specific area such as the vicinity of the current position of the vehicle. At this time, information used for map display is acquired from the map data.

  The guidance route calculation process is a process of receiving an input of a destination by the user from the operation unit 13 and calculating an optimum guidance route from the current position to the destination.

  In the route guidance process, when the vehicle arrives before a guidance point such as a right-left turn intersection on the guidance route, a guidance voice instructing a right turn, a left turn, etc. is output to the speaker 14, and an enlarged view of the guidance point is displayed. This is a process of guiding the driving of the vehicle along the guidance route by being displayed on the image display device 12.

  Details of the guidance route calculation process will be described below. In the guidance route calculation process, the control circuit 17 determines the destination based on the user's operation on the operation unit 13 and then starts executing the program 200 shown in FIG. 4. First, in step 203, the current position of the host vehicle is started. The route from the destination to the destination is calculated by a plurality of upper ranks (for example, five) having a short time required for arrival at the destination (or travel distance or travel fee amount; hereinafter the same). The calculated route is hereinafter referred to as a candidate route.

  The time required for a certain route may be obtained by dividing the length of the route by a predetermined speed (for example, 30 km / h), congestion information acquired from VICS, real-time traveling speed information on the road, etc. For example, the calculation may be performed with further consideration.

  FIG. 5 shows candidate route groups 21 to 24 from the current position 20 to the destination 30. In this example, four candidate routes are calculated.

  In step 205, real-time information is received. Real-time information refers to the latest weather information, season, and weather warning information in each region. The latest weather information specifically refers to a period that goes back by a reference period from the current time. The reference period may be 2 days or 3 days, for example. Among these real-time information, the current weather, the presence / absence of an earthquake, and a weather warning are obtained from the weather / disaster information receiver 15, the current and past seasons are identified from the current date, the most recent weather excluding the current, The presence / absence of an earthquake and a weather warning are read from the storage medium of the map data acquisition unit 16.

  Subsequently, the control circuit 17 extracts the candidate routes calculated in Step 203 one by one in order from the shortest required time, and executes the loop processing of Steps 210 to 240 for each of the extracted candidate routes. In the example of FIG. 5, the required time is short in the order of the candidate routes 21, 22, 23, and 24.

  In this loop process once, first, in step 210, a past disaster occurrence point through which the target candidate route passes is extracted from a plurality of past disaster occurrence points during the recorded weather / disaster information recording process. Note that not only the past disaster occurrence points that are actually on the target candidate route but also the past disaster occurrence points that are within the reference distance (for example, 500 meters) from the target candidate route, even if they are not on the target candidate route, It is regarded as a past disaster occurrence point.

  This is because the natural disaster that caused the road closure may affect not only the road that was closed, but also the road that is close to the road closure point. In view of the fact that the range of the affected area varies depending on the type of natural disaster, the reference distance may be changed according to the type of natural disaster.

  For example, in the example of FIG. 5, the candidate route 21 is determined to pass through past risk occurrence points 31, 32, and 33. The candidate route 22 is determined to pass through the past risk occurrence point 33 in addition to the past risk occurrence points 34, 35, and 36. This is because a part of the candidate route 22 is within the influence range 39 of the past danger occurrence point 33 (that is, within the reference distance from the past danger occurrence point 33). Further, it is determined that the candidate route 23 passes the past danger occurrence point 37. The candidate route 24 is determined not to pass through the past danger occurrence point 37.

  Subsequently, in step 215, each of the recorded past disaster occurrence points on the extracted target candidate route is compared with the weather at that point in the real-time information, the presence / absence of an earthquake, the season, and a weather warning.

  Subsequently, in step 220, it is determined whether or not there is a point (that is, a dangerous point) that matches the real-time information among the records of past disaster occurrence points on the target candidate route. That is, it is determined whether the target candidate route passes through the danger point.

  In addition, when real-time information exists for several days including the present part, if it corresponds with one of them, it will be assumed that the matching point is a dangerous point which corresponds with real-time information. That is, not only a point that matches the information for today in the real-time information, but also a point that matches information such as the previous day, the day before the previous day, and the like is a dangerous point. This is because natural disasters such as landslides may be caused by rainy weather several days ago.

  For example, when the weather / disaster information as shown in FIG. 3 is recorded, for the past disaster occurrence point A, the weather at the point A is rain in any one of the real-time information for the reference period retroactively from the present, Only when the current season is spring, the point A is a danger point.

  For past disaster occurrence point B, the weather at point B is a typhoon, the current season is autumn, and a storm warning is issued at point B in any of the real-time information for the reference period retroactively from the present The point B is a danger point only when there is.

  For the past disaster occurrence point C, the point C becomes a dangerous point only when there is an earthquake at the point C in any of the real-time information for the reference period retroactively from the present.

  For past disaster occurrence point D, the weather at point D is rain, the current season is summer, and a storm warning is issued at point D in any of the real-time information for the reference period retroactively from the present. The point D becomes a dangerous point only when there is.

  For the past disaster occurrence point E, the point E becomes a dangerous point only in the case where the season of the point E is winter in any of the real-time information for the reference period retroactively from the present.

  Note that how long past weather and earthquakes can cause a natural disaster depends on the type of natural disaster. Therefore, the value of the reference period may be changed according to the disaster type at the target point to which the reference period is applied. That is, the reference period may be different depending on the type of natural disaster that caused the traffic closure. In the example of FIG. 5, it is assumed that the points 31, 35, 36, and 37 are determined as the dangerous points among the past dangerous occurrence points.

  If it is determined that the target candidate route passes through the danger point, step 245 is subsequently executed. If it is determined that the target candidate route does not pass, the loop is exited and then step 245 and subsequent steps are executed.

  Therefore, the loop of steps 220 to 240 is executed in order from the candidate route with the shortest required time, and is repeated until immediately before the candidate route that does not pass through the dangerous point becomes the target, and the candidate route that does not pass through the dangerous point becomes the first target. At this point, the control circuit 17 exits the loop.

  In step 225, it is determined whether or not the required time difference is smaller than the allowable time. If smaller, the process proceeds to step 230. If not, the process proceeds to step 210 of the next loop. Here, the required time difference is a value indicating how long the target candidate route is required for the route with the shortest required time among the candidate routes. The allowable time may be a constant value (for example, 30 minutes) or may be a value that can be set in advance by the user using the operation unit 13.

  In step 230, based on the weather / disaster information in the storage medium, the highest occurrence rate (hereinafter referred to as the highest occurrence rate in the route) is identified among the dangerous points through which the target candidate route passes. In the example of FIG. 5, when the occurrence rates of the points 31, 33, 35, 36, and 37 are 0.1%, 0.08%, 0.005%, 0.002%, and 1.5%, respectively, The highest occurrence rate in the route of 21 is 0.1%, the highest occurrence rate in the route of the route 22 is 0.08%, and the highest occurrence rate in the route of the route 23 is 0.002%.

  Subsequently, in step 235, it is determined whether or not the highest occurrence rate in the path is lower than the lowest occurrence rate between paths. If it is lower, step 240 is executed. If not, the process proceeds to step 210 of the next loop. . The value of the lowest occurrence rate between paths is reset to 100% when the execution of the program 200 is started. In step 240, the value of the highest occurrence rate in the route is substituted for the lowest occurrence rate between routes, and then the process proceeds to step 210 of the next loop.

  By such a loop process, the delay of the required time of the target candidate route with respect to the candidate route with the shortest required time (hereinafter referred to as the shortest candidate route) is within an allowable range (see step 230), and the route of the target candidate route When the intra-route highest occurrence rate is lower than the inter-route minimum occurrence rate (see step 235), the inter-route lowest occurrence rate is replaced with the value of the intra-route highest occurrence rate (see step 240).

  In the example of FIG. 5, if the route 21 (corresponding to the shortest candidate route), the route 22, and the route 23 are routes whose delay is within an allowable time, the minimum occurrence rate between these routes is 0. 0 of the route 23. 002%.

  By performing such a loop process one or more times, the candidate path that passes through the dangerous point that is the target of the loop process, and the required time that is not longer than the allowable time than the shortest candidate path is the highest. The candidate route with the lowest occurrence rate (route 23 in the example of FIG. 5) is set as the candidate route with the highest degree of safety.

  If all of the candidate routes pass through the danger zone, the loop of steps 210-240 is executed for all candidate routes, and then in step 260, candidate routes having the same highest occurrence rate in the route as the lowest occurrence rate between routes (ie, The candidate route having the highest degree of safety among candidate routes whose required time is not longer than the permissible time than the shortest candidate route is displayed as a recommended route to the user using the image display device 12. Simultaneously with the display, a message for inquiring whether or not the candidate route is a guidance route is displayed. Further, information on the location of the dangerous spot, the disaster type, and the occurrence rate in the recommended route is displayed on the image display device 12. Then, based on the fact that the user has performed an operation to the effect of the guidance route on the operation unit 13, the candidate route is determined as the guidance route. Thereafter, the execution of the program 200 is terminated.

  As described above, when all of the plurality of candidate routes are routes that pass through one or more of the dangerous points (that is, dangerous routes), the control circuit 17 determines whether or not a plurality of candidate routes are based on the frequency information relating to the recorded dangerous points. The candidate route with the highest degree of safety is selected as the guide route.

  In this way, even if all candidate routes are dangerous routes, the information on the frequency of disaster occurrence at the dangerous point is used to provide the highest safety level (specifically, the highest occurrence rate in the route is the highest). By selecting a candidate route as a guide route, a relatively safe route can be used as the guide route among the dangerous routes.

  If the target candidate route is not a dangerous route, that is, if it is a safe route, it is determined in step 245 whether or not the required time difference between the target candidate routes is shorter than the allowable time. 250 is executed. If it is not short, step 255 is executed subsequently.

  In step 250, the target candidate route is displayed as a recommended route to the user using the image display device 12. Simultaneously with the display, a message for inquiring whether or not to use the candidate route as a guide route is displayed. Based on the fact that the user has performed an operation to the guide unit 13 on the operation unit 13, the candidate route is displayed. Confirm as the guide route. Thereafter, the execution of the program 200 is terminated.

  In step 255, the candidate candidate route and the candidate route having the same highest occurrence rate within the route as the lowest occurrence rate between routes (that is, among the risky routes whose required time is not longer than the allowable time by more than the allowable time than the shortest candidate route) The two high-risk routes are displayed on the image display device 12 as recommended routes. Simultaneously with the display, a message for inquiring which of the two recommended routes is the guide route is displayed. Further, information on the location of the dangerous spot, the disaster type, and the occurrence rate in the recommended route is displayed on the image display device 12.

  Then, based on the fact that the user has performed an operation for setting the target candidate route as the guide route to the operation unit 13, the target candidate route is determined as the guide route, and the execution of the program 200 is terminated. Further, based on the fact that the user has performed an operation on the operation unit 13 to select the dangerous route with the highest safety degree among the dangerous routes whose required time is not longer than the allowable time than the shortest candidate route. Then, the dangerous route is determined as the guidance route, and the execution of the program 200 is terminated.

  As described above, for each of a plurality of past risk occurrence points that have been closed due to natural disasters in the past, the vehicular navigation device 1 has a natural environment (hereinafter referred to as the natural environment) at the time of occurrence of the natural disaster that caused the closed roads. (Referred to as natural environment at the time of disaster) (refer to FIG. 2 and FIG. 3), and also obtains information on the current natural environment for each of the plurality of past hazard occurrence points. A point where the recorded natural environment at the time of disaster coincides with the acquired current natural environment (see step 215) is extracted as a dangerous point, and the dangerous point is more than the dangerous route passing through one or more of the extracted dangerous points. A safety route that does not pass through any of the above is preferentially selected as a guidance route (see steps 220 → 245 → 250).

  In this way, when the natural environment (weather, the presence or absence of an earthquake, the season, etc.) at the time of a natural disaster at multiple points that have been closed due to natural disasters in the past matches the current natural environment at that point, Guidance in consideration of the presence of roads that are likely to be closed due to natural disasters by preferentially selecting a safe route that does not pass through any of these dangerous points as a guide route. A route can be selected.

However, the vehicle navigation apparatus 1 is based on the fact that the time required for traveling on the safe route exceeds a reference value (that is, a value obtained by adding an allowable time to the time required for the shortest candidate route) (see step 245). Of the dangerous routes, both the route having the delay within the allowable range and the highest safety level and the safe route are presented to the user, and information indicating that the dangerous route passes through the dangerous point is also presented. When the user selects the dangerous route, the dangerous route is selected as the guidance route (see step 255).
Such an operation can arrive at the destination at an appropriate time even if there is a certain degree of danger, even if it is a safe route, rather than selecting a route that takes a circuitous route that takes too much time as a guidance route. This is based on the idea that the user who selects the dangerous route may meet the user's needs. And even if it is a dangerous route, if the user is also presented with information indicating that it passes the dangerous point, the user can determine whether or not the dangerous route is taken based on the information.

  In addition, even when the candidate route is not on the road to which the dangerous point belongs, the vehicle navigation apparatus 1 regards the route as passing through the dangerous point if the route is within the reference distance from the dangerous point. It has become. By doing in this way, it becomes possible to select a route in consideration of the possibility that a natural disaster at a dangerous point may reach the surrounding roads.

  In addition, the vehicle navigation device 1 acquires the natural environment information for the reference period retroactively from each of the plurality of points, and among the recorded points, the recorded disaster natural environment, A point where at least one of the acquired natural environments matches is extracted as a dangerous point.

  This is because a natural environment (such as rain) that leads to a natural disaster (such as a landslide) may occur several days before the occurrence of the natural disaster. By doing in this way, the predictability of a natural disaster can be made higher in the guidance route selection in consideration of the possibility of a road closure due to a natural disaster.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, the scope of the present invention is not limited only to the said embodiment, The various form which can implement | achieve the function of each invention specific matter of this invention is included. It is.

  For example, in the above embodiment, the control circuit 17 may be configured to calculate a safe route that does not pass through the dangerous point other than the candidate route calculated in step 203 of the program 200. This safe route may be a very detour route compared to the shortest route in the candidate routes. In step 260, the safety route is also presented to the user, and the safety route having the highest safety level or the safety route is selected as the guide route according to the selection operation of the user. Also good.

  Further, for example, when there are two dangerous routes with the highest safety level in step 260, the importance of the disaster type of the dangerous point through which the dangerous routes pass (for example, avalanche is more important than river flooding). May be presented to the user as a recommended route.

  Further, for example, the control circuit 17 may be configured to switch whether or not to perform the route guidance considering the past disaster occurrence point according to the user's operation on the operation unit 13.

  In addition, for example, data that needs to be updated, such as weather / disaster information, is not limited to the storage medium of the map data acquisition unit 16, and is retained even when the main power supply of the other vehicle navigation device 1 is stopped. It may be stored in a storage medium (for example, flash memory, EEPROM, backup RAM) that can be continued. In that case, the storage medium of the map data acquisition unit 16 does not have to be a writable storage medium such as an HDD, and may be a non-writable storage medium such as a DVD or a CD-ROM.

  In the above embodiment, each function realized by the control circuit 17 executing the program is realized by using hardware having those functions (for example, an FPGA capable of programming the circuit configuration). You may come to do.

  Moreover, in the said embodiment, although a navigation apparatus is a vehicle-mounted type, a navigation apparatus may be a thing of the type which a person can carry. For example, a mobile phone or PDA having a navigation device function also corresponds to the navigation device of the present invention.

It is a lineblock diagram of navigation device 1 for vehicles concerning an embodiment of the present invention. 3 is a flowchart of a program 100 executed by a control circuit 17. It is a chart which illustrates the recording format of weather and disaster information. It is a flowchart of the program 200 which the control circuit 17 performs. It is a figure which illustrates candidate courses 21-24 and danger spots 31-37.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle navigation apparatus 12 Image display apparatus 13 Operation part 15 Weather / disaster information receiver 16 Map data acquisition part 17 Control circuit 21-24 Candidate route 20 Current position 30 Destination 31-37 Past risk occurrence point

Claims (10)

A navigation device that calculates a guidance route to a destination and presents it to a user,
Recording means for recording information on the natural environment of the point (hereinafter referred to as the natural environment at the time of the disaster) at the time of the occurrence of the natural disaster that caused the closure for each of the points that were closed due to natural disasters in the past ( 100)
Acquisition means (20) for acquiring current natural environment information for each of the plurality of points
5) and
Of the plurality of points, a point where the natural disaster environment recorded by the recording unit (100) matches the current natural environment acquired by the acquisition unit (205) is extracted as a dangerous point, and the extracted danger Selecting means (215-260) for preferentially selecting, as the guide route, a safe route that does not pass through any of the dangerous points over a dangerous route that passes through one or more of the points ;
The selection means (215-260) is configured such that the time required for traveling on the safe route exceeds a reference value.
The risk route is selected as the guidance route, and the risk route is selected.
The navigation apparatus characterized by presenting information indicating that the road passes through the dangerous point . The priority presentation means (215-260) presents both the safe route and the dangerous route as recommended routes for the guide route based on the time required for traveling on the safe route exceeding a reference value. the for the dangerous route, the navigation device according to claim 1, characterized in that also present information to the effect that through the hazard location. A navigation device that calculates a guidance route to a destination and presents it to a user,
Recording means for recording information on the natural environment of the point (hereinafter referred to as the natural environment at the time of the disaster) at the time of the occurrence of the natural disaster that caused the closure for each of the points that were closed due to natural disasters in the past ( 100)
Acquisition means (20) for acquiring current natural environment information for each of the plurality of points
5) and
Of the plurality of points, a point where the natural disaster environment recorded by the recording unit (100) matches the current natural environment acquired by the acquisition unit (205) is extracted as a dangerous point, and the extracted danger Selecting means (215-260) for preferentially selecting, as the guide route, a safe route that does not pass through any of the dangerous points over a dangerous route that passes through one or more of the points ;
The priority presentation means (215-260) sets a reference time for a time required for traveling on the safe route.
A route that recommends the safe route and the dangerous route as a guide route based on
And presenting information about passing through the dangerous point for the dangerous route.
A navigation device. Candidate route calculation means (2) for calculating a plurality of candidate routes that are candidates for the guide route to the destination
03)
The recording means (100), for each of the plurality of points that have been closed due to natural disasters in the past, along with information on the natural environment at the time of disaster, for each of the plurality of points,
Record information on the frequency of traffic closure due to natural disasters,
The selection means (215-260) determines the risk points recorded by the recording means (100) when all of the plurality of candidate routes are risk routes that pass through one or more of the extracted risk points. The navigation according to any one of claims 1 to 3 , wherein a candidate route having the highest safety level among the plurality of candidate routes is selected as the guide route based on the frequency information. apparatus. A navigation device that calculates a guidance route to a destination and presents it to a user,
Recording means for recording information on the natural environment of the point (hereinafter referred to as the natural environment at the time of the disaster) at the time of the occurrence of the natural disaster that caused the closure for each of the points that were closed due to natural disasters in the past ( 100)
Acquisition means (20) for acquiring current natural environment information for each of the plurality of points
And 5),
Candidate route calculation means (2) for calculating a plurality of candidate routes that are candidates for the guide route to the destination
03)
Of the plurality of points, a point where the natural disaster environment recorded by the recording unit (100) matches the current natural environment acquired by the acquisition unit (205) is extracted as a dangerous point, and the extracted danger Selecting means (215-260) for preferentially selecting, as the guide route, a safe route that does not pass through any of the dangerous points over a dangerous route that passes through one or more of the points ;
The recording means (100) is configured to record the plurality of points that have been closed due to natural disasters in the past.
For each of the multiple points, along with information on the natural environment at the time of disaster,
Record information on the frequency of traffic closure due to natural disasters,
The selection means (215-260) is configured to detect the danger that all of the plurality of candidate routes are extracted.
The recording means (100) records the dangerous route that passes through one or more of the steep spots.
Based on the frequency information related to the dangerous point, the safety degree is highest among the plurality of candidate routes.
A navigation device , wherein a candidate route is selected as the guidance route . When the route is not on the road to which the dangerous point belongs, the selection means (215-260) considers that the route passes through the dangerous point when the route is within a reference distance from the dangerous point. The navigation device according to any one of claims 1 to 5 , wherein The acquisition means (205) acquires information on the natural environment for a reference period retroactively from each of the plurality of points,
The selection means (215-260) is the recording means (100) among the plurality of points.
There the time recorded disasters natural environment, at least one of the natural environment of the reference period in which the acquiring means (205) is acquired, the claims 1 and extracts a point which matches as the hazard location 6 The navigation device according to any one of the above. A program used in a navigation device that calculates a guidance route to a destination and presents it to a user,
Recording means for recording information on the natural environment of the point (hereinafter referred to as the natural environment at the time of the disaster) at the time of the occurrence of the natural disaster that caused the closure for each of the points that were closed due to natural disasters in the past ( 100),
Acquisition means (20) for acquiring current natural environment information for each of the plurality of points
5) and
Of the plurality of points, a point where the natural disaster environment recorded by the recording unit (100) matches the current natural environment acquired by the acquisition unit (205) is extracted as a dangerous point, and the extracted danger As a selection means (215-260) for preferentially selecting a safe route that does not pass through any of the dangerous points as a guide route over a dangerous route that passes through one or more of the points ;
The selection means (215-260) is configured such that the time required for traveling on the safe route exceeds a reference value.
The risk route is selected as the guidance route, and the risk route is selected.
A program that presents information about passing through a dangerous point on a road . A program used in a navigation device that calculates a guidance route to a destination and presents it to a user,
Recording means for recording information on the natural environment of the point (hereinafter referred to as the natural environment at the time of the disaster) at the time of the occurrence of the natural disaster that caused the closure for each of the points that were closed due to natural disasters in the past ( 100),
Acquisition means (20) for acquiring current natural environment information for each of the plurality of points
5) and
Of the plurality of points, a point where the natural disaster environment recorded by the recording unit (100) matches the current natural environment acquired by the acquisition unit (205) is extracted as a dangerous point, and the extracted danger As a selection means (215-260) for preferentially selecting a safe route that does not pass through any of the dangerous points as a guide route over a dangerous route that passes through one or more of the points ;
The priority presentation means (215-260) sets a reference time for a time required for traveling on the safe route.
A route that recommends the safe route and the dangerous route as a guide route based on
And presenting information about passing through the dangerous point for the dangerous route.
Program to butterflies. A program used in a navigation device that calculates a guidance route to a destination and presents it to a user,
Recording means for recording information on the natural environment of the point (hereinafter referred to as the natural environment at the time of the disaster) at the time of the occurrence of the natural disaster that caused the closure for each of the points that were closed due to natural disasters in the past ( 100),
Acquisition means (20) for acquiring current natural environment information for each of the plurality of points
5),
Candidate route calculation means (2) for calculating a plurality of candidate routes that are candidates for the guide route to the destination
03) and
Of the plurality of points, a point where the natural disaster environment recorded by the recording unit (100) matches the current natural environment acquired by the acquisition unit (205) is extracted as a dangerous point, and the extracted danger As a selection means (215-260) for preferentially selecting a safe route that does not pass through any of the dangerous points as a guide route over a dangerous route that passes through one or more of the points ;
The recording means (100) is configured to record the plurality of points that have been closed due to natural disasters in the past.
For each of the multiple points, along with information on the natural environment at the time of disaster,
Record information on the frequency of traffic closure due to natural disasters,
The selection means (215-260) is configured to detect the danger that all of the plurality of candidate routes are extracted.
The recording means (100) records the dangerous route that passes through one or more of the steep spots.
Based on the frequency information related to the dangerous point, the safety degree is highest among the plurality of candidate routes.
A program that selects a candidate route as the guidance route .

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