JP5051046B2 - Road information guidance device, road information guidance method, and computer program - Google Patents

Description

  The present invention relates to a road information guidance device, a road information guidance method, and a computer program that provide guidance regarding a roundabout.

  2. Description of the Related Art In recent years, a navigation device is often mounted on a vehicle that provides vehicle travel guidance so that a driver can easily arrive at a desired destination. Here, the navigation device detects the current position of the vehicle by a GPS receiver or the like, acquires map data corresponding to the current position through a recording medium such as a DVD-ROM or HDD or a network, and displays it on a liquid crystal monitor. It is a device that can do. Furthermore, such a navigation device has a route search function for searching for the optimum route from the vehicle position to the destination when a desired destination is input, and displays the guidance route on the display screen and approaches the intersection. In such a case, the driver is surely guided to a desired destination by providing voice guidance.

Further, in a conventional navigation device, when a vehicle reaches the vicinity of a branch point such as an intersection while traveling, the name of a place corresponding to each branching road is displayed. For example, in Japanese Patent Application Laid-Open No. 2004-294340, when the guidance function of the navigation device is turned off, if there is a road that branches off from the road on which the vehicle travels, the name of the municipality that is ahead of the branching road is indicated. A technique for displaying on a display is described.
JP 2004-294340 A (pages 6 to 9, FIGS. 4 to 7)

  However, in the navigation device described in Patent Document 1 described above, when there is a branch road around the own vehicle when the guidance function is turned off, the name of the municipality that is ahead of the branch road is always displayed on the display. Was supposed to be displayed. However, there are many users who are bothered by the frequent direction guidance for such branch roads. On the other hand, if the direction guidance for the branch road is not always performed, the guidance is not performed even in a situation where the user is lost, for example, resulting in a significant decrease in user convenience. Therefore, it is desirable that the direction guidance of the branch road is performed only at the timing required by the user.

  The present invention has been made to solve the above-described conventional problems, and by considering the rounding of the vehicle performed at the roundabout, the exit path that exits from the roundabout only at the timing required by the user. An object of the present invention is to provide a road information guidance device, a road information guidance method, and a computer program that can provide direction guidance and improve user convenience.

  In order to achieve the above object, a road information guide device (1) according to claim 1 of the present application is a travel history acquisition means (13) that acquires a travel history of a vehicle, and a map that acquires map information including information related to a roundabout. Based on the information acquisition means (13), the lap determination means (13) for determining whether or not the vehicle has made a lap without leaving the roundabout based on the travel history and the map information, and the lap determination means Direction guidance means (13) for guiding a direction corresponding to an exit path exiting from the roundabout when it is determined that the vehicle has made a roundabout without leaving the roundabout. .

  A road information guidance device (1) according to claim 2 is the road information guidance device according to claim 1, wherein a current position acquisition means (13) for acquiring a current position of the vehicle, Entry determination means (13) for determining whether or not the vehicle has entered the roundabout based on the current position and the map information, and the travel history acquisition means (13) is the entry determination means. When it is determined that the vehicle has entered the roundabout, the road on which the vehicle is currently located is stored as an approach road, and the lap determination means (13) reenters the approach road. In this case, it is determined that the vehicle has circulated without leaving the roundabout.

  A road information guidance device (1) according to claim 3 is the road information guidance device according to claim 1, wherein a current position acquisition means (13) for acquiring a current position of the vehicle, Based on the current position and the traveling history of the vehicle, traveling road determination means (13) for determining whether or not the vehicle is traveling on the same road as the road on which the vehicle has traveled in the past, the current position of the vehicle and the map Current position determination means (13) for determining whether or not the vehicle is located at the roundabout based on information, and the lap determination means (13) includes a road on which the vehicle has traveled in the past. The vehicle travels on the same road, and the current position of the vehicle is located at a roundabout, and the total travel history of the vehicle from the past running on the road to the present passes the roundabout. It is a history of traveling The case, the vehicle is characterized in that it is determined that orbit without exiting the roundabout.

The road information guidance method according to claim 4 is a map information including a travel history acquisition step (S8, S11, S15) in which the following steps are executed by the CPU to acquire a travel history of the vehicle, and information on the roundabout. A map information acquisition step (S3) for acquiring the vehicle, a lap determination step (S9) for determining whether or not the vehicle circulated without leaving the roundabout based on the travel history and the map information, A direction guidance step (S6) for guiding a direction corresponding to the exit path exiting from the roundabout when it is determined in the rounding judgment step that the vehicle has rounded without exiting the roundabout. It is characterized by.

  Further, the computer program according to claim 5 is mounted on a computer and acquires a map information including a travel history acquisition function (S8, S11, S15) for acquiring a travel history of the vehicle, and map information including information relating to a roundabout. In the function (S3), the lap determination function (S9) for determining whether or not the vehicle has circulated without leaving the roundabout based on the travel history and the map information, and the vehicle in the lap determination function And a direction guidance function (S6) for guiding a direction corresponding to the exit path exiting from the roundabout when it is determined that the vehicle has circulated without leaving the roundabout.

  In the road information guidance device according to claim 1 having the above-described configuration, by taking into account the rounding of the vehicle performed at the roundabout, the direction guidance of the exit road that exits from the roundabout is performed only at a timing required by the user. It becomes possible. In addition, it is possible to provide guidance under a situation where the user needs guidance, and convenience for the user is improved.

  Further, in the road information guidance device according to claim 2, when the vehicle re-enters the approach road without leaving the roundabout, it is determined that the vehicle has gone around without leaving the roundabout. It is possible to accurately determine the timing at which the user needs guidance for a roundabout from the travel history of the vehicle. Therefore, it becomes possible to perform the direction guidance of the exit route which exits from a roundabout only at the timing which a user requires.

  In the road information guidance device according to claim 3, the vehicle travels on the same road as the road on which the vehicle has traveled in the past, and the current position of the vehicle is located at a roundabout, and the vehicle has traveled in the past. If the vehicle travel history after traveling on the roundabout is the history of traveling at the roundabout, it is determined that the vehicle has circulated without leaving the roundabout. It is possible to accurately determine the timing at which guidance of a roundabout is required. Therefore, it becomes possible to perform the direction guidance of the exit route which exits from a roundabout only at the timing which a user requires.

  Further, in the road information guidance method according to claim 4, by taking into account the rounding of the vehicle performed at the roundabout, it is possible to guide the direction of the exit road that exits from the roundabout only at the timing required by the user. It becomes possible. In addition, it is possible to provide guidance under a situation where the user needs guidance, and convenience for the user is improved.

  Furthermore, the computer program according to claim 5 allows the computer to guide the exit path to exit from the roundabout only at a timing required by the user by taking into account the rounding of the vehicle performed at the roundabout. Is possible. In addition, it is possible to provide guidance under a situation where the user needs guidance, and convenience for the user is improved.

  DETAILED DESCRIPTION Hereinafter, a navigation device according to the present invention will be described in detail with reference to the drawings based on a specific embodiment. First, a schematic configuration of the navigation device 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a navigation device 1 according to this embodiment.

  As shown in FIG. 1, the navigation apparatus 1 according to the present embodiment is based on a current position detection unit 11 that detects the current position of the vehicle, a data recording unit 12 that records various data, and input information. A navigation ECU (travel history acquisition means, map information acquisition means, lap determination means, direction guidance means, current position acquisition means, approach determination means, current position determination means, travel road determination means) 13 for performing various arithmetic processes An operation unit 14 that receives an operation from the user, a liquid crystal display 15 that displays information such as a map to the user, a speaker 16 that outputs voice guidance related to route guidance, and a DVD that is a storage medium storing a program. It comprises a DVD drive 17 for reading and a communication module 18 for communicating with an information center such as a traffic information center. That.

Below, each component which comprises the navigation apparatus 1 is demonstrated in order.
The current position detection unit 11 includes a GPS 21, a geomagnetic sensor 22, a vehicle speed sensor 23, a steering sensor 24, a gyro sensor 25, an altimeter (not shown), and the like. Can be detected. Here, in particular, the vehicle speed sensor 23 is a sensor for detecting a moving distance and a vehicle speed of the vehicle, generates a pulse according to the rotation of the wheel of the vehicle, and outputs a pulse signal to the navigation ECU 13. And navigation ECU13 calculates the rotational speed and moving distance of a wheel by counting the pulse which generate | occur | produces. Note that the navigation device 1 does not have to include all of the above five types of sensors, and the navigation device 1 may include only one or more of these types of sensors.

  The data recording unit 12 is a driver for reading out an external storage device and a hard disk (not shown) as a recording medium, a map information DB 31 recorded on the hard disk, a predetermined program, etc. and writing predetermined data on the hard disk. And a recording head (not shown).

Here, the map information DB 31 stores various map data necessary for route guidance, traffic information guidance, and map display.
The map data specifically includes link data 33 relating to road (link) shape, node data 34 relating to node points, intersection data 35 relating to each intersection, facility data relating to facilities, search data for searching for routes, points Search data for searching for images, maps, roads, image information such as traffic information, etc. are drawn on the liquid crystal display 15.

In particular, the intersection data 35 includes information about a roundabout (rotary). Here, as shown in FIG. 2, the circular intersection 51 is configured by a circular road 52 including a plurality of links A to D connected in a substantially circular shape. The ring road 52 is connected to entry / exit roads 53 to 56 including links E to H. The ring road 52 is a ring road on which the vehicle travels to change the traveling direction. Further, the entry / exit roads 53 to 56 are roads on which vehicles enter and exit the roundabout 51.
When the vehicle 57 travels on the roundabout, the vehicle 57 enters the roundabout 51 from any of the entry / exit roads 53 to 56. Thereafter, the vehicle 57 entering the roundabout 51 travels on the roundabout road 52 and exits the roundabout 51 from the entrance / exit road corresponding to the target direction among the entrance / exit roads 53 to 56.

  In addition, the intersection data 35 of the roundabout stored in the map information DB 31 includes (a) the link numbers of the links (links A to D in FIG. 2) constituting the roundabout, and (b) the approach connected to the roundabout. The link number of the exit route (links E to H in FIG. 2) and (c) information relating to the direction corresponding to the entry / exit route are included. Here, (c) the direction corresponding to the entry / exit route is the name of the city / town / village located at the destination of the entry / exit route, or the name of the facility (name of public facility or interchange, etc.) located at the destination of the connecting road ), And when a plurality of approach / exit roads are connected to the roundabout, they are associated with the respective entrance / exit paths.

Further, the image drawing data includes various image and character data (hereinafter referred to as “the direction guidance sign 71” displayed on the liquid crystal display 15 (refer to FIG. 5). (Referred to as guide sign material data). FIG. 3 is a schematic diagram showing an example of guide sign material data stored in the map information DB 31 according to the present embodiment.
Specifically, as shown in FIG. 3, the guide sign material data includes an intersection image data 61 in which an image indicating the shape of the roundabout and the direction of the entrance / exit at the roundabout, and the direction to be guided at the roundabout. Is composed of area character data 62 in which characters (specifically, place names and facility names in the area) are stored. The image data stored in the intersection image data 61 and the character data stored in the direction character data 62 are respectively associated with one or a plurality of circular intersections stored in the map information DB 31.

  On the other hand, the navigation ECU (Electronic Control Unit) 13 uses a known Dijkstra method to search for a guide route to the destination, a travel guidance process for guiding the travel according to the set guide route, and the own vehicle Is an electronic control unit that performs overall control of the navigation device 1 such as a direction guidance process for guiding a direction corresponding to an approach / exit route when it is determined that guidance for a roundabout is required during traveling at a roundabout. The CPU 41 as the arithmetic device and the control device, the RAM 41 used as a working memory when the CPU 41 performs various arithmetic processes, and the route data when the route is searched, the lap determination flag, etc. are stored, navigation In addition to programs for controlling various devices included in the device 1, an internal storage device such as a ROM 43 for recording a direction guidance processing program (see FIG. 4) described later, a flash memory 44 for recording a program read from the ROM 43, and the like is provided. Yes.

  The operation unit 14 is operated, for example, when inputting a destination as a guidance end point, and includes a plurality of operation switches (not shown) such as various keys and buttons. Then, the navigation ECU 13 performs control to execute various corresponding operations based on switch signals output by pressing the switches. In addition, it can also be comprised by the touchscreen provided in the front surface of the liquid crystal display 15.

  The liquid crystal display 15 also has operation guidance, operation menu, key guidance, guidance route from the current location to the destination, guidance information along the guidance route, parking lot information, traffic information, news, weather forecast, time, mail TV programs etc. are displayed. In particular, in the navigation device 1 according to the present embodiment, when the host vehicle makes at least one round of the roundabout, the direction guidance sign 71 (see FIG. 5) that guides the direction corresponding to the approach / exit road connected to the roundabout. Is also displayed.

  Further, the speaker 16 outputs a voice guidance for guiding the traveling along the guidance route based on an instruction from the navigation ECU 13 specifically. Here, examples of the voice guidance to be output include “300m ahead XX intersection is in the right direction”.

  The DVD drive 17 is a drive that can read data recorded on a recording medium such as a DVD or a CD. Then, the map information DB 31 is updated based on the read data.

  The communication module 18 is a communication for receiving traffic information composed of information such as traffic jam information, regulation information, parking lot information, traffic accident information, etc. transmitted from a traffic information center such as a VICS center or a probe center. For example, a mobile phone or DCM is applicable.

  Next, a direction guidance processing program executed in the navigation device 1 having the above configuration will be described with reference to FIG. FIG. 4 is a flowchart of the direction guidance processing program according to the present embodiment. Here, the direction guidance processing program is executed at a predetermined time interval (for example, 200 msec) after the ignition of the vehicle is turned on, and enters when it is determined that the vehicle needs guidance at the roundabout while traveling at the roundabout. It is a program that guides the direction corresponding to the exit route. The program shown in the flowchart of FIG. 4 below is stored in the RAM 42, ROM 43, etc. provided in the navigation ECU 13, and is executed by the CPU 41.

  First, in the direction guidance processing program, in step (hereinafter abbreviated as S) 1, the CPU 41 uses the GPS 21 to acquire the current position of the vehicle. Furthermore, the map matching process which specifies the current position of the own vehicle on the link based on the acquired current position of the own vehicle and the map information stored in the map information DB 31 is performed. Thereby, a link (hereinafter referred to as a current location link) where the vehicle is currently located is acquired. Note that S1 corresponds to the processing of the current position acquisition unit.

  Next, in S2, the CPU 41 determines whether or not the own vehicle has moved between the links and has moved to a different link based on the current location link acquired in S1. And when it determines with the own vehicle having moved to a different link (S2: YES), it transfers to S3. On the other hand, when it determines with the own vehicle continuing driving | running the same link (S2: NO), the said direction guidance process program is complete | finished.

  In S <b> 3, the CPU 41 acquires intersection data 35 regarding the circular intersection from the map information DB 31. Note that S3 corresponds to the processing of the map information acquisition means.

  Subsequently, in S4, the CPU 41 determines whether or not the current location link is a link (links A to D in FIG. 2) that forms a circular intersection based on the current location link acquired in S1 and the intersection data 35 acquired in S3. That is, it is determined whether or not the vehicle is traveling at the roundabout.

  If it is determined that the current location link is a link that forms a roundabout (S4: YES), that is, if it is determined that the vehicle is traveling at the roundabout, the process proceeds to S5. On the other hand, when it is determined that the current location link is not a link constituting a roundabout (S4: NO), the process proceeds to S12.

  In S5, the CPU 41 reads the circulation determination flag stored in the RAM 42, and determines whether or not the circulation determination flag is ON. The lap determination flag is a flag that specifies that the vehicle has entered the roundabout and has made one or more laps without leaving, and is set to OFF in the initial setting process of S14 described later. In addition, the turn determination flag is turned on in S10 described later. Further, in the initialization process performed when the direction guidance processing program is first started after the ignition of the vehicle is turned on, the turn determination flag is turned off.

If it is determined that the lap determination flag is ON (S5: YES), that is, if it is determined that the vehicle has made one or more laps without leaving the roundabout, the CPU 41 determines whether the lap determination flag is ON. It is determined that the vehicle needs guidance for the roundabout, and the direction guidance process for guiding the direction corresponding to the approach / exit road connected to the roundabout is started (S6). Specifically, the following processing is executed.
First, image data and character data related to the roundabout where the vehicle has entered are extracted from the guide sign material data. Specifically, first, the type of the roundabout where the vehicle entered (for example, the shape of the ring road, the number of entry / exit roads, etc.) is specified from the intersection data in the map information DB 31, and the roundabout according to the type of the roundabout An image showing the shape and the direction of the approach / exit road at the roundabout is extracted from the intersection image data 61. Moreover, the character data previously linked | related with the roundabout which the own vehicle approached are extracted from the direction character data 62 (refer FIG. 3).
Next, a direction guidance sign is created using the extracted character data and image data and the current vehicle direction. Specifically, the orientation of the extracted intersection image data 61 is adjusted so that the road on which the vehicle entered the circular intersection is located below or the north side is located above. Thereafter, the direction character data 62 is arranged in correspondence with the adjusted image orientation.

Here, FIG. 5 is a diagram showing a guidance screen displayed on the liquid crystal display 15 of the navigation device 1 when the direction guidance processing is started in S6.
As shown in FIG. 5, the liquid crystal display 15 displays a map image around the vehicle and a direction guidance sign 71 for guiding the direction corresponding to the approach / exit road connected to the roundabout. For example, in the direction guide sign 71 shown in FIG. 5, a schematic road map 72 showing that the current roundabout at which the vehicle is traveling is a roundabout where the entrance and exit roads are connected in four directions, and the respective entrance and exit roads. Is composed of a character 73 indicating the municipality ahead of the vehicle and a vehicle position mark 74 indicating the current position of the vehicle on a schematic road map 72.
Then, by referring to the direction guide sign 71, the user can easily know that he / she is going to “Toyota” when he exits the roundabout from the approach / exit road on the right side of his / her vehicle.
In addition, the user can easily grasp that he / she is heading to “Gifu” by exiting the roundabout from the approach / exit road ahead of his / her vehicle by referring to the direction guide sign 71.
In addition, the user can easily understand that he / she is going to “Yokkaichi” by leaving the roundabout from the approach / exit road on the left side of his / her vehicle by referring to the direction guide sign 71.
Furthermore, by referring to the direction guide sign 71, the user can easily grasp the direction to “Anjo” when exiting the roundabout from the approach / retreat road behind the host vehicle. The direction guidance process started in S6 is continued until it is determined that the host vehicle is not traveling at the roundabout (S13). Further, S6 corresponds to the processing of the direction guide means.

  On the other hand, if it is determined in the determination process of S5 that the lap determination flag is OFF (S5: NO), that is, it is determined that the vehicle has not made one or more laps without leaving the roundabout. If yes, the process proceeds to S7.

  In S7, the CPU 41 reads the previous link stored in the RAM 42, and determines whether or not the previous link is a link constituting a roundabout. The previous link is a link that the vehicle traveled before traveling on the current travel link, and the link number of the previous link is stored in the RAM 42 in S11 or S15 described later. Further, S7 corresponds to the processing of the entry determination means.

  If it is determined that the previous link is not a link constituting a roundabout (S7: NO), that is, if it is determined that the vehicle has newly entered the roundabout by moving between the links, The process proceeds to S8. In S8, the CPU 41 stores the current location link (specifically, the link number) acquired in S1 in the RAM 42 as the incoming link and the previous link. Thereafter, the direction guidance processing program is terminated. The approach link corresponds to the link that travels first when the vehicle enters the roundabout.

  On the other hand, when it is determined that the previous link is a link constituting a roundabout (S7: YES), that is, it is determined that the vehicle is continuously traveling at the roundabout before moving between the links. In this case, the process proceeds to S9.

  In S9, the CPU 41 reads the approach link stored in the RAM 42, and whether or not the current location link and the approach link acquired in S1 are the same link, that is, whether the vehicle has circulated without leaving the roundabout Judge whether or not. Note that S9 corresponds to the processing of the lap determination means.

  If it is determined that the current location link and the approach link are the same link (S9: YES), that is, if it is determined that the vehicle has gone around without leaving the roundabout, the process proceeds to S10. To do. In S10, the CPU 41 reads the circulation determination flag stored in the RAM 42, and sets the circulation determination flag to ON. Therefore, as a result, when all the travel histories are histories traveling on the roundabout, the lap determination flag is set to ON. Thereafter, the direction guidance processing program is terminated.

  On the other hand, when it is determined that the current location link and the approach link are not the same link (S9: NO), that is, when it is determined that the vehicle has not yet made a round of the roundabout, the process proceeds to S11. To do. In S11, the CPU 41 stores the current location link (specifically, the link number) acquired in S1 in the RAM 42 as the previous link. Thereafter, the direction guidance processing program is terminated.

  If it is determined in S4 that the current location link is not a link that forms a roundabout (S4: NO), that is, if it is determined that the host vehicle is not traveling at the roundabout, the process proceeds to S12. .

  In S12, the CPU 41 determines whether the direction corresponding to the approach / exit road connected to the roundabout is being guided. The direction guidance is started in S6.

  If it is determined that the direction corresponding to the approach / exit route connected to the roundabout is being guided (S12: YES), the direction guidance started in S6 is terminated (S13). Thereafter, the process proceeds to S14. On the other hand, when it determines with not guiding the direction corresponding to the approach / exit road connected to the roundabout (S12: NO), it transfers to S15.

  In S14, the CPU 41 initializes the lap determination flag stored in the RAM 42 (flag is OFF).

  Subsequently, in S15, the CPU 41 stores the current location link (specifically, the link number) acquired in S1 in the RAM 42 as the previous link. Thereafter, the direction guidance processing program is terminated. Note that S8, S11, and S15 correspond to the processing of the travel history acquisition means.

Next, an embodiment of direction guidance when the above-described direction guidance processing program (see FIG. 4) is implemented in the navigation device 1 mounted on a vehicle traveling at a roundabout will be described with reference to FIG.
1. As shown in FIG. 6, when the vehicle first enters the roundabout from an approach / retreat road connected to the roundabout, the current location link where the vehicle is currently located is stored as the entrance link.
2. Thereafter, each time the vehicle moves between the links, it is determined whether or not the vehicle has made a roundabout while storing the current location link as a vehicle travel history.
3. When re-entering the approach link without leaving the roundabout, that is, the entire travel history of the vehicle after it is determined that it has entered the roundabout is the history of traveling through the roundabout, and entering the current location link When the link matches, it is determined that the vehicle has made a roundabout at the roundabout, and direction guidance for the roundabout shown in FIG. 5 is started.
4). Thereafter, each time the vehicle moves between the links, it is determined whether or not the vehicle has exited the roundabout, and the direction guidance of the roundabout is continued until the vehicle exits the roundabout.
5. And when a vehicle leaves a roundabout, direction guidance of a roundabout is ended.

As described above in detail, in the navigation device 1 according to the present embodiment, the road information guidance method by the navigation device 1, and the computer program executed by the navigation ECU 13 of the navigation device 1, it is determined that the vehicle has entered the roundabout. If the vehicle has entered the current link as an approach link (S8), and the vehicle again enters the entrance link without leaving the roundabout, the vehicle will guide the roundabout. Since it is determined that it is necessary and the direction guidance of the roundabout is started (S6), it is possible to perform the direction guidance of the exit path that exits from the roundabout only at the timing required by the user. In addition, it is possible to provide guidance under a situation where the user needs guidance, and convenience for the user is improved.
In addition, when the own vehicle re-enters the approach road without leaving the roundabout, it is determined that the vehicle has lost its way and is traveling around the roundabout, and the user needs guidance for the roundabout. It becomes possible to accurately determine the timing at which the user needs to guide the roundabout from the traveling history of the roundabout.

Note that the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the scope of the present invention.
For example, the direction guidance processing program shown in FIG. 4 can be configured as follows. FIG. 7 is a flowchart of a direction guidance processing program according to another embodiment. Here, the direction guidance processing program shown in FIG. 7 is executed at predetermined time intervals (for example, 200 msec) after the ignition of the vehicle is turned on.

  First, in the direction guidance processing program, in S101, the CPU 41 uses the GPS 21 to acquire the current position of the host vehicle. Furthermore, the map matching process which specifies the current position of the own vehicle on the link based on the acquired current position of the own vehicle and the map information stored in the map information DB 31 is performed. Thereby, a link (hereinafter referred to as a current location link) where the vehicle is currently located is acquired.

  Next, in S102, based on the current location link acquired in S101, the CPU 41 determines whether or not the vehicle has moved between links and has moved to a different link. And when it determines with the own vehicle having moved to a different link (S102: YES), it transfers to S103. On the other hand, when it determines with the own vehicle continuing driving | running the same link (S102: NO), the said direction guidance process program is complete | finished.

  Subsequently, in S103, the CPU 41 determines whether or not the current location link acquired in S101 is the same link as the link stored in the travel history DB included in the navigation device. The travel history DB is a storage unit that stores a travel history of travel of the vehicle. Specifically, the link number of the link on which the vehicle has traveled is stored together with the travel time.

  And when it determines with the present location link being the same link as the link memorize | stored in driving | running history DB (S103: YES), it transfers to S104. On the other hand, when it is determined that the current location link is a link different from the link stored in the travel history DB (S103: NO), the process proceeds to S109. Note that S103 corresponds to the processing of the traveling road determination means.

  Subsequently, in S104, the CPU 41 determines whether the current location link is a link (links A to D in FIG. 2) constituting the circular intersection based on the current location link acquired in S101 and the intersection data 35 read from the map information DB 31. It is determined whether the vehicle is traveling at a roundabout.

  And when it determines with the present location link being a link which comprises a roundabout (S104: YES), ie, when it determines with the own vehicle driving | running | working a roundabout, it transfers to S105. On the other hand, when it is determined that the current location link is not a link constituting a roundabout (S104: NO), the process proceeds to S109. Note that S104 corresponds to the processing of the current position determination means.

  In S105, the CPU 41 reads the circulation determination flag stored in the RAM 42, and determines whether or not the circulation determination flag is ON. The lap determination flag is a flag for specifying that the vehicle has entered the roundabout and has made one or more laps without leaving, and is set to OFF in the initial setting process of S111 described later. Further, in S108, which will be described later, the turn determination flag is turned ON.

  If it is determined that the lap determination flag is ON (S105: YES), that is, if it is determined that the vehicle has made one or more laps without leaving the roundabout, the CPU 41 determines whether the lap determination flag is ON. It is determined that the vehicle needs guidance for the roundabout, and a direction guidance process for guiding the direction corresponding to the approach / exit road connected to the roundabout is started (S106). The specific direction guidance has already been described with reference to FIG.

  On the other hand, if it is determined in the determination process of S105 that the lap determination flag is OFF (S105: NO), that is, it is determined that the vehicle has not made a lap or more without leaving the roundabout. If yes, the process proceeds to S107.

  In S107, the CPU 41 reads the travel history of the host vehicle stored in the travel history DB, and after the same link as the current location link is stored in the past as the travel history (that is, after entering the roundabout in the past), It is determined whether or not all of the traveling history of the vehicle up to the link is traveling history at the roundabout.

  If it is determined that the travel history of the vehicle is all traveled at the roundabout (S107: YES), the process proceeds to S108. In S108, the CPU 41 reads the circulation determination flag stored in the RAM 42, and sets the rotation determination flag to ON. Thereafter, the direction guidance processing program is terminated.

  On the other hand, when it is determined that the travel history of the vehicle is not all travel history at the roundabout (S107: NO), the direction guidance processing program is terminated.

  On the other hand, in S109, the CPU 41 determines whether the direction corresponding to the approach / exit route connected to the roundabout is being guided. The direction guidance is started in S106.

  If it is determined that the direction corresponding to the approach / exit route connected to the roundabout is being guided (S109: YES), the direction guidance started in S106 is terminated (S110). Thereafter, the process proceeds to S111. On the other hand, when it is determined that the direction corresponding to the approach / exit route connected to the roundabout is not being guided (S109: NO), the direction guidance processing program is terminated.

  In S111, the CPU 41 initializes the circulation determination flag stored in the RAM 42 (flag is OFF). Thereafter, the direction guidance processing program is terminated.

  In the direction guidance processing program shown in FIG. 7, the vehicle travels on the same road as the road on which the vehicle has traveled in the past, and the current position of the vehicle is located at a roundabout, and the vehicle has traveled on the road in the past. When the entire travel history of the vehicle from the back to the present is the history of traveling at the roundabout, it is determined that the vehicle has lost its way and is traveling around the roundabout, and the user needs guidance for the roundabout. Accordingly, it is possible to accurately determine the timing at which the user needs to guide the roundabout from the traveling history of the vehicle at the roundabout. Therefore, it becomes possible to perform the direction guidance of the exit route which exits from a roundabout only at the timing which a user requires.

  Further, in this embodiment, when the roundabout has made one or more rounds, it is determined that the vehicle needs guidance for the roundabout, and direction guidance of the roundabout is started. May be two or more laps.

  Moreover, although the direction corresponding to the entry / exit route is displayed on the direction guide sign 71, the road number of the entry / exit route may be displayed.

  Further, in the present embodiment, a plurality of types of intersection image data 61 and direction character data 62 (see FIG. 3) are stored in advance in the map information DB 31, and an intersection image corresponding to a circular intersection where the vehicle travels when performing direction guidance. The data 61 and the direction character data 62 are read from the map information DB 31 and the images of the direction guide signs 71 are formed by combining the read data. However, the direction guide signs 71 of all the circular intersections are preliminarily formed. Images may be stored in association with each other.

It is the block diagram which showed the navigation apparatus which concerns on this embodiment. It is the figure which showed an example of the roundabout. It is the schematic diagram which showed an example of the guidance sign material data memorize | stored in map information DB which concerns on this embodiment. It is a flowchart of the direction guidance processing program which concerns on this embodiment. It is the figure which showed the direction guidance screen of the roundabout displayed on the liquid crystal display of a navigation apparatus. It is explanatory drawing explaining the embodiment of direction guidance. It is a flowchart of the direction guidance processing program which concerns on other embodiment.

Explanation of symbols

1 Navigation device 13 Navigation ECU
31 Map information DB
32 Travel history DB
41 CPU
42 RAM
43 ROM

Claims (5)

Traveling history acquisition means for acquiring a traveling history of the vehicle;
Map information acquisition means for acquiring map information including information about the roundabout;
Based on the travel history and the map information, a lap determination means for determining whether the vehicle has lapted without leaving the roundabout,
Direction guidance means for guiding the direction corresponding to the exit path exiting from the roundabout when the rounding judgment means determines that the vehicle has looped without exiting the roundabout. Road information guidance device. Current position acquisition means for acquiring the current position of the vehicle;
Entry determination means for determining whether or not the vehicle has entered the roundabout based on the current position of the vehicle and the map information;
The travel history acquisition means stores the road where the vehicle is currently located as an approach road when the entry determination means determines that the vehicle has entered the roundabout,
2. The road information guide according to claim 1, wherein when the vehicle re-enters the approach road, the turn determination unit determines that the vehicle has made a turn without leaving the roundabout. apparatus. Current position acquisition means for acquiring the current position of the vehicle;
Traveling road determination means for determining whether the vehicle is traveling on the same road as the road on which the vehicle has traveled in the past, based on the current position of the vehicle and the traveling history of the vehicle;
Current position determining means for determining whether the vehicle is located at the roundabout based on the current position of the vehicle and the map information;
The lap determination means includes
The vehicle when the vehicle travels on the same road as the road on which the vehicle traveled in the past and the current position of the vehicle is located at a roundabout, and after the vehicle travels on the road in the past to the present The road information guide device according to claim 1, wherein the vehicle travels without exiting the roundabout when the total travel history of No. 1 is a history of traveling at the roundabout. The following steps are executed by the CPU,
A travel history acquisition step for acquiring a travel history of the vehicle;
A map information acquisition step for acquiring map information including information about the roundabout;
Based on the travel history and the map information, a lap determination step for determining whether or not the vehicle has circulated without leaving the roundabout,
And a direction guidance step for guiding a direction corresponding to the exit path exiting from the roundabout when it is determined in the rounding determination step that the vehicle has rounded without exiting the roundabout. Road information guidance method. On the computer,
A travel history acquisition function for acquiring a travel history of the vehicle;
A map information acquisition function for acquiring map information including information about the roundabout,
Based on the travel history and the map information, a lap determination function for determining whether or not the vehicle has circulated without leaving the roundabout,
A direction guidance function for guiding the direction corresponding to the exit path exiting from the roundabout when it is determined that the vehicle has rounded without exiting the roundabout in the rounding determination function;
A computer program for executing

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