JP2006003199A - Route search method for navigation system, and navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce possibility that a recommendation route including a road which a user does not wish to pass is searched for, in a navigation system. <P>SOLUTION: This navigation system is provided with: a storage device 3 storing link information associated with road information identifying a road to which a link belongs, and cost of the link; and arithmetic processing part 1 searching for the recommendation route to a destination, and performing route guidance according to the recommendation route. The navigation system makes the arithmetic processing part 1 execute: a process for estimating the link of a deviation spot inside the recommendation route when a vehicle deviates from the recommendation route, and specifying road identification information associated to the link of the deviation spot by use of the link information; and a process for increasing the cost of the link associated to the specified road identification information and searching for a new recommendation route to the destination by use of the link information when the deviation from the recommendation route is continuously performed a prescribed frequency or above at intervals each shorter than a prescribed distance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a navigation device, and more particularly to a route search technique for an in-vehicle navigation device.

  The navigation device has an auto-reroute function that determines whether or not the vehicle deviates from the recommended route, and re-searches the recommended route from the current position to the destination when it is determined that the vehicle deviates from the recommended route. The thing is known (for example, patent document 1).

  The navigation device also includes a navigation device that specifies a deviating section in the recommended route when the user deviates from the recommended route and increases and corrects cost information of links included in the specified deviating section. An apparatus is known (for example, Patent Document 2). In Patent Document 2, the costs of all links included in the section deviating from the recommended route are corrected for increase. Therefore, in the next route search, it is possible to reduce the possibility that all links included in the departure section are searched as recommended routes.

Japanese Patent Laid-Open No. 2000-241182 JP 2001-208560 A

  By the way, the recommended route searched by the navigation device may include a road that the user does not want to pass due to congestion or the like. In such a case, the user may drive the vehicle by deviating from the recommended route by his / her own intention.

  The navigation device of Patent Document 1 executes auto-reroute without changing the search condition for which the route is searched first even if the user deviates from the recommended route by his / her own intention. For this reason, in Patent Document 1, a recommended route including a road that the user does not want to pass may be provided again to the user who has avoided the recommended route.

  Further, the route search method of Patent Document 2 may cause the following problems. The user may want to avoid only certain roads in the recommended route. However, in such a case, only a specific road that the user does not want to pass may not be avoided. For example, depending on the connection relationship between the recommended route and another road, the user may avoid a road other than a specific road that he / she wants to avoid although he / she does not want to avoid it. In such a case, according to Patent Document 2, a route that the user does not want to avoid may be identified as a deviation section of the recommended route. As a result, in Patent Document 2, the cost may increase even for roads that the user does not want to avoid passing, and there may be cases where the user cannot search for a satisfactory route.

  Further, the deviation section of Patent Document 2 is a section obtained after the vehicle travels to the destination on the recommended route. Therefore, Patent Document 2 cannot reflect the user's request until the route search before the departure section is identified, for example, the re-search of the recommended route when the departure from the route on the way to the destination. There is.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to search for a recommended route including a road that the user does not want to pass when the navigation device searches for a route. It is to reduce.

  In order to solve the above-described problem, according to one aspect of the present invention, a recommended route to a destination is searched using link information included in a map and included in map data, and the destination is determined according to the searched recommended route. It is applied to a navigation device that provides route guidance up to. Here, the link information is associated with the cost of the link and road identification information for identifying the road to which the link belongs for each link.

  The navigation device detects a current position of the vehicle, and determines whether the vehicle deviates from the recommended route using the detected current position, the searched recommended route, and map data. And a step of estimating a departure point and a departure point link in the recommended route using the current position and the map data, and determining the departure point link and the link information. Identifying the road identification information associated with the link of the departure point using the method, and whether the departure from the recommended route is continuously performed a predetermined number of times or less at intervals shorter than a predetermined distance. A step of determining using the point and the map data, and determining that the deviation is continuously performed a predetermined number of times at an interval shorter than a predetermined distance. In addition, after increasing the cost of the link associated with the identified road identification information in the link information, a new recommended route to the destination using the current position and the link information And a new recommended route to the destination using the current position and the link information when it is determined that the deviation has not been continuously performed more than a predetermined number of times at an interval shorter than a predetermined distance. Searching for.

  Thus, according to the present invention, the road identification information for identifying the road to which the link belongs is included in the link information. Further, in the present invention, when it is determined that the vehicle deviates from the recommended route, the link of the deviation point in the recommended route is estimated, and the link of the deviation point is supported using the link of the estimated deviation point and the link information. The attached road identification information is specified. Further, in the present invention, it is determined whether or not the departure from the recommended route is continuously performed a predetermined number of times or more at an interval shorter than the predetermined distance. The reason for making such a determination is that when the user repeatedly deviates from the recommended route at a short distance interval a predetermined number of times or more, it can be predicted that the user wants to avoid the recommended route. .

  In the present invention, when it is determined that the above deviation is continuously performed a predetermined number of times or more at an interval shorter than the predetermined distance, the cost of the link associated with the identified road identification information in the link information is reduced. After the increase, a new recommended route to the destination is searched using the current position and link information. In this way, the reason for increasing the cost of the link associated with the identified road identification information is that the user does not want to pass through the specified recommended route rather than the entire recommended route. It is because it was thought that there were many roads (for example, a national highway). In addition, the reason that users do not want to pass is that they are not specific sections (sections on national roads) of specific roads in the recommended route, but often on specific roads (eg national roads). It is.

  Therefore, according to the present invention, when searching for a new recommended route to the destination when deviating from the recommended route, the possibility of searching for a recommended route including a road that the user does not want to pass is reduced. Can be made.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, a schematic configuration of an in-vehicle navigation device to which the present embodiment is applied will be described with reference to FIG.

  FIG. 1 is a schematic configuration diagram of an in-vehicle navigation device (hereinafter simply referred to as “navigation device”) to which an embodiment of the present invention is applied.

  As shown in the figure, the navigation device includes an arithmetic processing unit 1, a display 2, a map data storage device 3, a voice input / output device 4, an input device 5, a wheel speed sensor 6, a geomagnetic sensor 7, a gyroscope. 8 and a GPS (Global Positioning System) receiver 9.

  The arithmetic processing unit 1 is a central unit for processing various information provided to the user by the navigation device. For example, the current position is detected based on information output from the various sensors 6 to 8 and the GPS receiver 9. The arithmetic processing unit 1 reads out map data around the detected current position from the map data storage device 3, develops the read map data in graphics, and overlays a mark indicating the current position on the display 2. To do. In addition, the arithmetic processing unit 1 searches for a recommended route connecting the current position and the destination instructed by the user, and guides the user using the voice input / output device 4 and the display 2.

  Further, the arithmetic processing unit 1 determines whether or not the detected current position deviates from the recommended route using the detected current position, recommended route, and map data. Then, when the detected current position deviates from the recommended route, the arithmetic processing unit 1 performs a re-search (auto-reroute) of the recommended route from the user to the destination received, and the recommended re-searched The user is guided to the destination according to the route.

  The display 2 is a unit that displays the image data generated by the arithmetic processing unit 1 and includes a CRT, a liquid crystal display, or the like. The signal S1 between the arithmetic processing unit 1 and the display 2 is generally connected by an RGB signal or an NTSC (National TV Standards Committee) signal.

  The map data storage device 3 is a unit for storing map data corresponding to a multi-stage scale map from an overall view of the Japanese archipelago to detailed views of municipalities throughout the country. For example, a CD-ROM drive, a CD-ROM, a DVD- It is composed of a ROM drive and a DVD-ROM or HDD.

  Here, the structure of the map data will be described.

  FIG. 2 is a diagram schematically showing the data structure of the map data stored in the map data storage device 3.

  As shown in the drawing, the map data storage device 3 stores map data 310 for each mesh region obtained by dividing the map into a plurality of parts. The map data 310 includes a mesh ID 311 for identifying a mesh area, and link data 312 for each link constituting a road included in the mesh area. The link data 312 includes link ID 3121, node information 3122, road type 3123, route number 3124, link length information 3125, travel time 3126, road name 3127, and the like.

  The link ID 3121 is link identification information uniquely assigned to each link in order to identify the link. The node information 3122 refers to coordinate information of two nodes (start node and end node) constituting a link. The road type 3123 refers to information indicating the type of road such as a national road, a prefectural road, and a general road.

  The route number 3124 is a number uniquely assigned to identify the route. Specifically, the route number 3124 is a number for identifying a route such as “National Route 1”, “National Route 246”, “Kanagawa Prefectural Route 2”, and the like. In the following description, it is assumed that “1” of the route number 3124 indicates “National highway No. 1”, and “246” of the route number 3124 indicates “National highway No. 246”. The route number 3124 can identify the route to which the link belongs. For example, “1” is associated with the route number 3124 for the link to which “XXΔΔ” is assigned to the link ID 3121. That is, from the link data 312 shown in the figure, it is possible to specify that the route to which the link having “XXΔΔ” assigned to the link ID 3121 belongs is “National Route 1”.

  The link length information 2125 refers to information indicating the link length (distance). The travel time information 3126 refers to the travel time (or travel time) of the link. The road name means the name of the road to which the link belongs.

  Returning to FIG. 1, the description will be continued. The voice input / output device 4 converts the message to the user generated by the arithmetic processing unit 1 into a voice signal and outputs it, recognizes the voice uttered by the user, and transfers the recognized content to the arithmetic processing unit 1.

  The input device 5 is a unit that receives instructions from the user for selecting various functions of the navigation device, setting a destination, etc., and includes a hardware switch such as a scroll key and a scale change key, a joystick, a touch panel attached on the display 2, and the like. Composed.

  The sensors 6 to 8 and the GPS receiver 9 are used by the navigation device to detect the current position. The wheel speed sensor 6 measures the distance from the circumference of the wheel and the measured rotational speed of the wheel, and further measures the angle at which the moving body is bent from the rotational speed of the paired wheel. The geomagnetic sensor 7 detects the magnetism held by the earth and detects the direction in which the moving body is heading. The gyro 8 is composed of an optical fiber gyro and a vibration gyro, and detects an angle at which the moving body rotates. The GPS receiver 9 receives a signal from a GPS satellite and measures the distance between the mobile body and the GSP satellite and the change rate of the distance with respect to three or more satellites, thereby moving the mobile body's current position, traveling direction, and traveling Measure orientation.

  Next, functions of the arithmetic processing unit 1 of the navigation device described above will be described with reference to FIG.

  FIG. 3 is a diagram for explaining a functional configuration of the arithmetic processing unit 1 of the present embodiment.

  As shown in the figure, the arithmetic processing unit 1 includes a setting unit 10, a current position detection unit 11, a data reading unit 12, a map match processing unit 13, a route search unit 14, a route guidance unit 15, a map display processing unit 16, and a graphic. A processing unit 17 is provided.

  The setting unit 10 receives a request from the user input to the input device 5 or the voice input / output device 4, and controls the arithmetic processing unit 1 so that processing corresponding to the requested content is executed. For example, when a user requests a search for a recommended route to go to the destination via the input device 5, the route search unit 14 is requested to search for a recommended route from the current position to the destination.

  The current position detection unit 11 uses the distance data and the angle data obtained as a result of integrating the distance pulse data S5 measured by the wheel speed sensor 6 and the angular velocity data S7 measured by the gyro sensor 8, respectively. By integrating with the shaft, the current position (X ′, Y ′), which is the position after the vehicle travels, is periodically calculated from the initial value (X, Y). The current position detection unit 11 outputs the calculated current position to the map display processing unit 16 and outputs the calculated current position to the map match processing unit 13 every predetermined number of calculations. When the current position detection unit 11 acquires correction data for the current position from the map match processing unit 13 described later, the current position detection unit 11 outputs the correction data for the current position to the map display processing unit 16. Further, when the current position is requested from the route guidance unit 15, the current position detection unit 11 outputs the current position (or correction data for the current position) to the route guidance unit 15.

  Here, the current position detection unit 11 integrates the azimuth data S6 obtained from the geomagnetic sensor 7 and the angular velocity data S7 obtained from the gyro 8 in order to match the relationship between the rotation angle of the host vehicle and the traveling direction. With reference to the angle data, the absolute direction of the direction in which the vehicle is traveling is estimated. As the current position detector 11 integrates the data S5 of the wheel speed sensor 6 and the data S7 of the gyro 8 respectively, errors accumulate, so that the position data S8 obtained from the GPS receiver 9 in a certain time is also stored. A process for canceling the accumulated error is performed to obtain data on the current position.

  The data reading unit 12 reads, from the map data storage device 3, map data in an area requested to be displayed on the display 2 or an area required for route search (including the current position and destination).

  The map match processing unit 13 performs map match processing for combining the map data around the current position read by the data reading unit 12 and the current position periodically detected by the current position detection unit 11. The map match processing unit 13 periodically corrects the current position and outputs data indicating the corrected current position to the current position detection unit 11.

  The route search unit 14 uses the Dijkstra method or the like to use the link data 312 (see FIG. 2) to find a route that reaches the destination at an optimal cost connecting the two specified points (current position, destination). Explore. The route search unit 14 outputs data indicating the recommended route to the map display processing unit 16 in order to display the route obtained as a result of the search as a recommended route on the display 2. Further, the route search unit 14 outputs data indicating the searched recommended route to the route guidance unit 15. The route search unit 14 has an auto-reroute function for re-searching for a recommended route to the set destination. When the route guidance unit 14 receives a request for re-searching the route from the route guidance unit 15 to the destination, the route guidance unit 14 performs a process of searching for a new recommended route from the current position to the destination by the auto-reroute function. . Note that the auto-reroute function of the present embodiment is realized by a conventional technique.

  The route guidance unit 15 guides the user so as to reach the destination through the searched recommended route. Specifically, the route guidance unit 15 periodically acquires the current position from the current position detection unit 11. The route guidance unit 15 uses the acquired current position, the data indicating the recommended route acquired from the route search unit 14, and the map data read from the map data storage device 3 via the data reading unit 12. Guide users to their destination. In the present embodiment, the specific method for guiding the user to the destination performed by the route guidance unit 15 is not particularly limited. For example, the route guidance unit 15 displays a screen in which the recommended route searched by the route search unit 14 is superimposed on the map 2 and displays information necessary for the vehicle to travel on the recommended route (for example, Information such as whether or not to make a turn at the next intersection is notified to the user via the audio output device.

  Further, the route guidance unit 15 determines whether the vehicle deviates from the recommended route using the current position, the recommended route, and the map data. Note that the determination as to whether or not the vehicle deviates from the recommended route is made according to the prior art. For example, the route guidance unit 15 determines whether or not the current position is on the recommended route. When it is determined that the current position is not on the recommended route, the route guiding unit 15 further obtains a distance between the current position and the recommended route. If the distance is equal to or greater than a predetermined distance, the vehicle deviates from the recommended route. May be determined.

  Further, when it is determined that the vehicle has deviated from the recommended route, the route guiding unit 15 estimates the deviating point and the deviating link. In the present embodiment, the specific method for estimating the departure point on the recommended route and the link of the departure point is not particularly limited. For example, the route guidance unit 15 may estimate the current position as the departure point when it is determined that the departure has occurred. Further, the departure point may be obtained on the recommended route from the current position and the recommended route when it is determined that the vehicle has deviated. In addition, the route guidance unit 15 holds the current position used for determination of departure from the recommended route for a predetermined number of times, and the current position estimated as the departure point and the current position held on the recommended route. You may make it estimate a deviation link.

  The map display processing unit 16 receives the map data 310 in the area requested to be displayed on the display 2 from the map data storage device 3 via the data reading unit 12. The map display processing unit 16 receives the recommended route searched from the route search unit 14 and receives information on the current position from the current position detection unit 11. Then, the map display processing unit 16 generates a map drawing command for drawing a road, other map components, a current position, a destination, and a mark such as an arrow for route guidance on the screen of the display 2, The result is output to the graphics processing unit 17.

  The graphics processing unit 17 displays image data on the screen of the display 2 using the map drawing command generated by the map display processing unit 16.

  Next, the hardware configuration of the arithmetic processing unit 1 according to the present embodiment will be described.

  FIG. 4 is a diagram illustrating a hardware configuration of the arithmetic processing unit 1.

  As shown in the figure, the arithmetic processing unit 1 includes a CPU (central processing unit) 21, a RAM (Random Access Memory) 22 that temporarily stores programs and data executed by the CPU 21, and the above-described units (setting unit 10, A program for executing the functions of the current position detection unit 11, the data reading unit 12, the map matching processing unit 13, the route searching unit 14, the route guiding unit 15, the map display processing unit 16, and the graphics processing unit 17). A ROM (Read Only Memory) 23 stored in advance, a DMA (Direct Memory Access) 24 that transfers data between the memories and between the memory and each device, and a drawing controller that executes graphic drawing and performs display control 25, a video random access memory (VRAM) 26 for storing graphics image data, and converting the image data into RGB signals. A color palette 27 for conversion, an A / D converter 28 for converting an analog signal into a digital signal, an SCI (Serial Communication Interface) 29 for converting a serial signal into a parallel signal synchronized with the bus, and a parallel signal synchronized with the bus And a PIO (Parallel Input / Output) 30 mounted on the bus and a counter 31 for integrating the pulse signal. Then, each of the above units (setting unit 10, current position detection unit 11, data reading unit 12, map match processing unit 13, route search unit 14, route guidance unit 15, map display processing unit 16, and graphics processing unit 17). The function is realized by the CPU 21 loading a program for executing the function of each of the units stored in the ROM 23 into the RAM 22 and executing the program.

  Next, the flow of the route re-search process performed by the navigation device of the present embodiment when the vehicle deviates from the recommended route will be described with reference to FIG.

  FIG. 5 is a diagram for explaining a flow of a recommended route re-search process performed by the navigation device of the present embodiment.

  The route guidance unit 15 of the navigation device of this embodiment includes a counter function (not shown), a departure point holding unit (not shown) that holds information indicating a departure point, and a target route that holds the route number of the route to be monitored. It has a number holding part (not shown). The departure point holding unit and the target route number holding unit are provided in a predetermined area of the RAM 22. The route guidance unit 15 guides the user to reach the destination through the recommended route acquired from the route search unit 14. And when a navigation apparatus performs route guidance, the following process steps are performed.

  Specifically, the route guidance unit 15 acquires the current position from the current position detection unit 11, and guides the route to the destination using the acquired current position, the recommended route acquired from the route search unit 14, and the map data. I do. Then, when performing route guidance, the route guidance unit 15 determines whether the vehicle deviates from the recommended route using the current position, the recommended route, and the map data (S100). When it is determined that the vehicle has deviated from the recommended route, the route guidance unit 15 estimates a departure point, stores the estimated departure point in the departure point holding unit, and proceeds to the process of S101. Note that the method for estimating the departure point is not particularly limited. In the following, it is assumed that the current position when it is determined that the vehicle has deviated is the departure point.

  In S101, the route guidance unit 15 performs a process of determining whether or not the route to be monitored has already been specified. And the route guidance part 15 progresses to the process after S104, when the route to be monitored is specified. On the other hand, when the route to be monitored is not specified, the route guiding unit 15 proceeds to the processing after S103 and specifies the route to be monitored. Specifically, in S101, the route guidance unit 15 determines whether or not the route number to be monitored (target route number) is held in the target route number holding unit. Then, when the target route number is not held in the target route number holding unit, the route guiding unit 15 determines that the route to be monitored is not specified. On the other hand, when the target route number is held in the target route number holding unit, the route guide unit 15 determines that the route to be monitored is specified. Note that the case where the route to be monitored is not specified corresponds to the case where it is first determined that the route has deviated from the recommended route after starting route guidance to the destination.

  In S102, the route guidance unit 15 estimates a departure link using the departure point estimated in S100 and the map data, and proceeds to S103.

  In S103, the route guidance unit 15 specifies the route to which the link estimated in S102 and the link estimated using the link data 312 included in the map data 310 belong. Specifically, the route guidance unit 15 extracts the estimated departure route number 3124 from the link data 312. For example, assume that the link ID of the estimated link is “Δ □ OO” (see FIG. 2). In that case, the route guidance unit 15 extracts “246” from the link data 312. The route guidance unit 15 specifies the route with the extracted route number 3124 as a monitoring target, and holds the extracted route number 3124 in the target route number holding unit.

  Subsequently, the route guidance unit 15 causes the route search unit 14 to perform a search for a recommended route again (S113). Specifically, the route guidance unit 15 sends a “recommended route re-search request” to the route search unit 14. Further, the route guidance unit 15 outputs the current position used in the process of determining whether or not the vehicle has deviated to the route search unit 14 when making a re-search request for the recommended route. When the route guidance unit 14 receives the “recommended route re-search request” from the route search unit 15, the link data 312 read from the map data storage device 3 and the current position acquired from the route guidance unit 15 are used. The route search from the current position to the destination is performed by the auto reroute function of the prior art. Thereafter, the route search unit 14 outputs the newly searched recommended route to the route guidance unit 15.

  When the route guidance unit 15 receives a new recommended route from the route search unit 14, the route guidance unit 15 starts route guidance to the destination using the received new recommended route, and returns to S100 (S114).

  Subsequently, in S101, the processing after S104 that is performed when the target route number is held in the target route number holding unit will be described.

  In S104, the route guidance unit 15 determines whether the recommended route determined to have deviated in S100 is connected to the monitoring target route. Specifically, the route guidance unit 15 determines whether there is a link having the specified route number held in the target route number holding unit among the links constituting the recommended route determined to have deviated. To do. If the recommended route determined to have deviated includes a link having the specified route number, the route guiding unit 15 determines that the recommended route that has deviated is connected to the route to be monitored, and S105. Proceed to the process. On the other hand, when there is no link having the specified route number among the links of the recommended route determined to have deviated, the route guiding unit 15 proceeds to the process of S108.

  In S105, the route guidance unit 15 obtains the distance between the departure point estimated in S100 and the departure point estimated when it was determined that the previous departure occurred from the map data, and the obtained distance is a predetermined distance that is held in advance. It is determined whether it is within the range. Specifically, the route guiding unit 15 holds “distance threshold (Xm)”. The route guidance unit 15 reads the departure point estimated when it was determined that the departure was held last time and held in the departure point holding unit. The route guidance unit 15 obtains the distance between the departure point estimated in S100 and the departure point estimated when it was determined that the previous departure occurred from the map data. If the value indicating the calculated distance is smaller than the “distance threshold (Xm)”, the route guiding unit 15 proceeds to the process of S106, and the value indicating the calculated distance is “distance threshold (Xm)”. If greater than "", the process proceeds to S108.

  In S106, the route guiding unit 15 performs a process of adding “1” to the counter value, and proceeds to the process of S107. The counter value is held in a predetermined area of the RAM 22. Further, it is assumed that the counter value is set to “0” when starting route guidance to the destination.

  In S107, the route guidance unit 15 determines whether or not the value of the counter counted in S106 is equal to or greater than the “counter threshold value (Y times)” held in advance. The route guiding unit 15 proceeds to the process of S110 when the value of the counter is equal to or greater than the “counter threshold value”. On the other hand, when the value of the counter is less than the “counter threshold value”, the route guiding unit 15 proceeds to the process of S113. The above-described counter value is equal to or greater than “counter threshold (Y times)” when the recommended route that has been auto-rerouted is connected to the route to be monitored. This is a case where the deviation at a shorter distance interval is repeated a predetermined number of times (“counter threshold”) or more. In this embodiment, it is estimated that the user does not want to pass the monitored route in such a case. And this embodiment performs the process of the following S110-S111 in order to reduce possibility that said estimated route will be searched as a recommended route.

  In S110, the route guiding unit 15 performs a process of initializing the “counter threshold value” to “0”, and proceeds to S111.

  In S111, the navigation apparatus increases the cost of the link belonging to the specified route to be monitored, and then performs auto-reroute to the destination. Specifically, the route guidance unit 15 makes a request for re-searching the recommended route specifying the route number 3124 to be monitored to the route search unit 14. Further, the route guidance unit 15 outputs the current position used in the process of determining whether or not the vehicle has deviated to the route search unit 14 when requesting a re-search for the recommended route.

  When the route search unit 14 receives a “re-search request for a recommended route specifying the route number 3124” from the route guide unit 15, the route search unit 14 applies a cost to the link having the specified route number 3124. Then, auto reroute is performed to obtain a recommended route (S106). Specifically, the route search unit 14 reads the link data 312 from the map data storage device 3 via the data reading unit 12. Then, the route search unit 14 performs correction to increase the cost (for example, travel time) of the link having the specified route number 3124 with respect to the read link data 312, and then corrects the corrected link data 312 and the route. A route search from the current position to the destination is performed using the current position acquired from the guide unit 15.

  For example, when the designated route number is “246”, for the link having the route number 3124 of “246”, the route set to the destination is increased after the cost set in the link data 312 is increased. I do. By re-searching the recommended route to the destination in this way, the possibility that the route with the route number “246”, that is, “National Route 246” is searched as the recommended route can be reduced. The route search unit 14 outputs the newly searched recommended route to the route guidance unit 15 and proceeds to the process of S112.

  In S112, when a new recommended route is received from the route search unit 14, the route guidance unit 15 starts route guidance to the destination using the received new recommended route, and returns to S100.

  Next, a process that proceeds when the counter value is less than the “counter threshold value” in S107 will be described. When the value of the counter is less than the “counter threshold value”, the navigation device of the present embodiment performs the same processing as S113 to S114 described above, and returns to S100. Specifically, when the counter value is less than the “counter threshold value” in 107, normal auto-reroute is performed without correcting the cost of the route to be monitored as in S111. In the present embodiment, at the stage where the number of departures is small (for example, 1 to 2 times), it is not determined whether or not the user does not want to pass the monitored route. The route guidance unit 15 performs normal auto-reroute, and then determines whether the user does not want to pass the monitored route when the departure is repeated. If the counter value is less than the “counter threshold value”, the route to be monitored has not been changed, and therefore the process of “clearing the counter value to 0” is not performed.

  Next, a description will be given of the processing after S108 which is performed when there is no link having the target route number among the links of the recommended route determined to have deviated in S104.

  In S108, the route guiding unit 15 performs a process of initializing the counter value to “0”, and proceeds to the process of S109. In S109, the route guidance unit 15 estimates a departure link using the departure point estimated in S100 and the map data. The route guidance unit 15 specifies the route number to which the estimated link and the estimated link using the link data 312 included in the map data 310 belong. The route guidance unit 15 changes the route number held in the target route number holding unit to the specified target route number with the route of the specified route number 3124 as the route to be monitored. The reason why the route to be monitored is changed in this way is that it is determined that the route to be monitored is not included in the recommended route deviating in S104.

  Thereafter, the navigation device of the present embodiment performs the same processing as S113 to S114 described above, and returns to S100.

  Subsequently, in S105, the process proceeds to S108 when the distance (deviation interval) between the departure point estimated in S100 and the departure point estimated when it was determined that the previous departure has occurred is larger than the “distance threshold (Xm)”. Processing will be described. Here, the case where the departure interval is larger than the “distance threshold (Xm)” is a case where the vehicle travels a distance longer than a predetermined distance without departing from the recommended route.

  In S105, if the distance (deviation interval) between the departure point estimated in S100 and the departure point estimated when the previous departure was determined is larger than the "distance threshold (Xm)", the above-described The same processing as S108 to S114 is performed. The reason why the same processing as S108 to S114 described above is performed is as follows. In other words, after the route to which the deviated link belongs is specified as the route to be monitored, if the vehicle travels a predetermined distance ("distance threshold") or more without departing from the recommended route, the user passes through that route. This is because he thought he was not likely to not want to.

  In the present embodiment, the specific numbers of “distance threshold (Xm)” and “counter threshold (Y times)” described above are not particularly limited. Further, “distance threshold (Xm)” and “counter threshold (Y times)” are preset in the navigation device as default values, but are not particularly limited thereto. The user may set “distance threshold (Xm)” and “counter threshold (Y times)” in the navigation device via the input device 5.

  Next, the route search process will be described with reference to FIGS. 5 and 6 with specific examples.

  FIG. 6 is a diagram showing a recommended route for explaining the route search processing of the present embodiment. Below, the re-search process of the recommended route when the user deviates from the route A and drives the vehicle by his / her own intention because he / she does not want to pass the route A60 will be described. The “mark 80” shown in the figure represents the current position of the vehicle. In addition, when the user sets the destination 71 as a navigation device, it is recommended that the departure point 70 located on the route A passes the route A and reaches the destination 71 on the route B via the intersection A. It is assumed that a route (recommended route a illustrated) has been searched.

  Now, even when the recommended route a is presented, the user may want to deviate from the route A60 due to congestion or the like. In this example, the user makes a “first deviation” from the recommended route. The navigation device determines that the vehicle has deviated from the recommended route through the processing of S100 described above, and obtains and holds the departure point 72. In this case, the route to be monitored is not specified because the departure is the “first time” after starting the route guidance to the destination. Therefore, the navigation device performs a process of estimating the deviated link, and extracts the route number to which the estimated link belongs from the estimated link and link data. Also, the navigation device identifies a route having the extracted route number as a monitoring target (S102 to 103). In the illustrated example, “Route A” is the monitoring target.

  Thereafter, the navigation device performs auto-reroute according to the conventional technique, searches for a recommended route (recommended route b shown in the figure) that passes through the route C, returns to the route A60 via the intersection D, and goes to the destination 71 via the intersection A. (S113). Here, the navigation device searches for a recommended route including “route A60” in order to search for a route to the destination without changing the search conditions. Thereafter, the navigation device performs route guidance to the destination using the new auto-rerouted recommended route (S114).

  Subsequently, it is assumed that the user deviates from the recommended route b in an attempt to avoid entering the route A again when a new recommended route (recommended route b) is indicated. In this example, it is assumed that the navigation device determines the departure of the vehicle when the vehicle departs from the route C62 included in the recommended route b to the narrow street (S100). In this case, the navigation device obtains the departure point 73 and determines whether or not a route to be monitored is specified. In this case, since the route A60 to be monitored is specified, the process proceeds to S104.

  In S104, it is determined whether the deviated recommended route (recommended route b) is connected to the specified route. In this example, the route specified as the monitoring target is “route A60”, and the recommended route that deviates (recommended route b) is connected to the route A60 at the intersection D, so the process proceeds to S105 to S106. Here, it is assumed that the distance between the departure points 72 and 73 is short (within a predetermined distance), and the counter value is also less than the “counter threshold value”. The navigation device performs auto-reroute according to the prior art as described above. As a result of the auto route, it is assumed that a recommended route that passes through the route D, returns to the route A via the intersection C, and goes to the destination 71 via the intersection A is searched (S113). That is, since the navigation device searches for a route to the destination without changing the search condition, the navigation device may search again for a recommended route including the “route A60” that the user does not want to pass. Thereafter, it is assumed that the search for the recommended route connected to the departure of the vehicle and the route to be monitored is repeated several times.

  Then, even if a new recommended route (n-th recommended route) is shown, the user avoids entering the route A and deviates from the n-th recommended route as described above. In this case, the navigation device determines the departure and obtains the departure point 74 as described above. Further, the navigation device determines whether or not a route to be monitored is specified (S101). In this case, since the route to be monitored is identified, the process proceeds to S104.

  In S104, it is determined whether the deviated recommended route (n-th recommended route) is connected to the identified route. In this example, it is assumed that the deviated n-th recommended route is connected to the specified route A. Furthermore, here, in the processing of S105 to S106, the interval between the departure points is within a predetermined distance, and the counter value is also equal to or greater than the “counter threshold value”.

  In this case, the navigation device estimates that the user does not want to pass “Route A60”, and costs the link having the route number of “Route A60” to be monitored. Execute auto reroute. As a result, in the present embodiment, it is possible to reduce the possibility of searching for a recommended route including the “route A60” estimated that the user does not want to pass. For example, according to the present embodiment, a recommended route that does not pass through the route A60, for example, a recommended route from the route F66 to the destination 71 via the route B61 is searched by auto-reroute. That is, in order to add cost to the route A60, a route that passes through the route E65, returns to the route A60 via the intersection B and reaches the destination 71 via the intersection A, that is, the route A60 that the user does not want to pass is included. The possibility that a recommended route is searched can be reduced.

  As described above, in this embodiment, the route number of the route to which the link belongs is included in the link data (see FIG. 2). In this embodiment, when the vehicle deviates from the recommended route, the deviating link is estimated, and the route to which the deviated link and the deviating link from the link data belong is specified. In this embodiment, it is determined whether or not the specified route is a route that the user does not want to pass. As described above, the reason why the user does not want to pass is to determine whether or not the road is not desired by the user on a “route unit basis”. This is because the route (for example, National Route 246) as a whole is often considered, not the specific section of National Route 246).

  In this embodiment, when the auto-rerouted recommended route is connected to the route to be monitored, the distance (deviation interval) from the departure point that deviated last time is obtained (S104 to 104), and the departure interval is determined. The number of deviations within the “distance threshold” is counted (S106 to 107). In this way, the number of times that the departure interval is determined to be within the “distance threshold” is counted when the user repeats the departure from the recommended route at a short distance interval. This is because it is estimated that there is a high possibility of wanting to avoid the problem.

  In this embodiment, when the number of departures is equal to or greater than the “counter threshold value”, auto reroute is performed after increasing the cost of the link having the route number to be monitored (S111). The reason for adopting such a configuration is that the user repeatedly deviates from the recommended route more than once because he / she thinks that he / she often dislikes traveling along the route included in the recommended route. is there.

  As described above, in this embodiment, the navigation device executes the above-described processing steps (S100 to 114), thereby estimating a route that the user does not want to pass and searching for the estimated route as a recommended route. Sex can be reduced. For example, it is assumed that the route number to be monitored is specified as “1”. When it is determined in S107 that the number of departures is equal to or greater than the “counter threshold value”, the navigation device of the present embodiment estimates that the user does not want to use “National Route 1”. And when the navigation device auto-reroutes the recommended route to the destination, it costs the link of “National highway 1”, so the possibility of newly searching “National highway 1” as a recommended route is reduced. Can be made.

  Thus, according to this embodiment, in the navigation device, it is possible to reduce the possibility of searching for a recommended route including a road that the user does not want to pass.

  The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the gist of the present invention. For example, in this embodiment, when the vehicle deviates from the recommended route, the route number 3124 of the deviating link on the recommended route is extracted from the link data 312 and the route to be monitored is specified by this route number 3124. However, it is not particularly limited to this. As shown in FIG. 2, “road name 3127” may be included in the link data 312 and the route to be monitored may be specified by “road name 3127”. The same effect can be obtained by increasing the cost of the link of the specified “road name 3127” and performing auto-reroute.

  Further, instead of “link route number 3124”, “road type 3123” may be used to identify the road to be monitored. Then, auto reroute may be performed by increasing the cost of the link of the specified “road type 3123”. With this configuration, it is possible to reduce the possibility that a road (for example, a national road, a prefectural road, etc.) that the user does not want to travel is searched for as a recommended route. This is because when a user deviates from the recommended route, it is often considered that he / she does not want to go through a specific road type (for example, a national road or a prefectural road) instead of a specific section of a route included in the recommended route. .

  Furthermore, in the present embodiment, the route to the destination is newly searched using the current position acquired from the route guiding unit 15, but the present invention is not particularly limited to this. When the route search unit 14 receives a re-search request, the route search unit 14 may acquire the current position from the current position detection unit 11 and search for a recommended route to the destination using the current position.

1 is a schematic configuration diagram of an in-vehicle navigation device to which an embodiment of the present invention is applied. It is a figure which shows the data structure of the map data memorize | stored in the map data storage device of this embodiment in simulation. It is a figure for demonstrating the function structure of the arithmetic processing part of this embodiment. It is a figure which shows the hardware constitutions of the arithmetic processing part of this embodiment. It is a figure for demonstrating the flow of the search process of the recommended route performed when the navigation apparatus of this embodiment deviates from a recommended route. It is the figure which showed the recommended route for demonstrating the route search process of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Arithmetic processing part, 2 ... Display, 3 ... Map data storage device, 4 ... Voice input / output device, 5 ... Input device, 6 ... Wheel speed sensor, 7 ... Geomagnetic sensor, 8 ... Gyro, 9 ... GPS receiver, DESCRIPTION OF SYMBOLS 10 ... Setting part, 11 ... Current position detection part, 12 ... Data reading part, 13 ... Map match process part, 14 ... Route search part, 15 ... Route guidance part, 16 ... Map display process part, 17 ... Graphics process part 21 ... CPU, 22 ... RAM, 23 ... ROM, 24 ... DMA, 25 ... drawing controller, 26 ... VRAM, 27 ... color palette, 28 ... A / D converter, 29 ... SCI, 30 ... PIO, 31 ... counter

Claims (8)

A route search method in a navigation device that is mounted on a vehicle and searches for a recommended route to a destination using link information included in map data, and performs route guidance to the destination according to the searched recommended route. And
The link information is associated with the cost of the link and road identification information for identifying the road to which the link belongs, for each link,
The navigation device
Detecting a current position of the vehicle;
Determining whether the vehicle deviates from the recommended route using the detected current position, the searched recommended route, and map data;
When it is determined that the vehicle has deviated, a link of a departure point and a departure point in a recommended route is estimated using the current position and the map data, and the link of the estimated departure point and the link information are used to estimate the link. Identifying road identification information associated with the departure point link;
Using the departure point and the map data to determine whether or not the departure from the recommended route is continuously performed a predetermined number of times or less at an interval shorter than a predetermined distance;
When it is determined that the deviation is continuously performed a predetermined number of times or more at an interval shorter than a predetermined distance, the cost of the link associated with the specified road identification information in the link information is increased. Searching for a new recommended route to the destination using the current position and the link information;
A step of searching for a new recommended route to the destination using the current position and the link information when it is determined that the deviation has not been continuously performed more than a predetermined number of times at an interval shorter than a predetermined distance; A route search method in a navigation device, wherein the route search method is executed. A route search method in a navigation device that is mounted on a vehicle and searches for a recommended route to a destination using link information included in map data, and performs route guidance to the destination according to the searched recommended route. And
The link information is associated with the cost of the link and road identification information for identifying the road to which the link belongs, for each link,
The navigation device
Detecting a current position of the vehicle;
Determining whether the vehicle deviates from the recommended route using the detected current position, the searched recommended route, and map data;
When it is determined that the deviation has occurred,
Estimating a departure point using the current position and the map data;
A road associated with the departure point link in the recommended route is estimated using the current position and the map data, and the link of the departure point is estimated using the estimated departure point link and the link information. Extracting identification information and identifying the extracted road identification information as a monitoring target;
Re-searching a recommended route from the current position to the destination using the link information, and
The step of re-searching the recommended route includes:
When it is determined that the vehicle has deviated from the re-searched recommended route, it is determined whether the deviated recommended route includes a link associated with the identified road identification information. And steps to
If it is determined that a link associated with the identified road identification information is included, whether or not the departure from the recommended route is continuously performed a predetermined number of times at an interval shorter than a predetermined distance. Determining using the departure point and the map data;
When it is determined that the deviation is continuously performed a predetermined number of times or more at an interval shorter than a predetermined distance, the cost of the link associated with the specified road identification information in the link information is increased. Re-searching for a new recommended route to the destination using the current position and the link information;
Re-searching a recommended route to the destination using the current position and the link information when it is determined that the departure is not continuously performed at a predetermined number of times or more at an interval shorter than a predetermined distance;
Re-searching a recommended route to the destination using the current position and the link information when it is determined that a link associated with the identified road identification information is not included. A route search method in a navigation device. The route search method according to claim 2,
The step of re-searching the recommended route includes:
When it is determined that the departure is not continuously performed more than a predetermined number of times at an interval shorter than a predetermined distance, and when it is determined that a link associated with the identified road identification information is not included. Is
The link of the departure point from the re-searched recommended route is estimated using the map data, and the road identification associated with the link of the departure point using the estimated departure point link and the link information A route search method characterized by newly extracting information and changing the road identification information specified as the monitoring target to the newly extracted road identification information. The route search method according to any one of claims 1 to 3,
The route identification method, wherein the road identification information is a route number for identifying a road route. The route search method according to any one of claims 1 to 3,
The route search method, wherein the road identification information is information representing a road name. The route search method according to any one of claims 1 to 3,
The route search method, wherein the road identification information is information representing a road type. A navigation device that is mounted on a vehicle and searches for a recommended route to a destination using link information included in map data, and performs route guidance to the destination according to the searched recommended route,
The link information is associated with the cost of the link and road identification information for identifying the road to which the link belongs, for each link,
Means for detecting the current position of the vehicle;
Means for determining whether the vehicle deviates from the recommended route using the detected current position, the searched recommended route, and map data;
When it is determined that the vehicle has deviated, a link of a departure point and a departure point in a recommended route is estimated using the current position and the map data, and the link of the estimated departure point and the link information are used to estimate the link. Means for identifying road identification information associated with the departure point link;
Means for determining whether or not the departure from the recommended route is continuously performed a predetermined number of times or more at an interval shorter than a predetermined distance, using the departure point and the map data;
When it is determined that the deviation is continuously performed a predetermined number of times or more at an interval shorter than a predetermined distance, the cost of the link associated with the specified road identification information in the link information is increased. Means for searching for a new recommended route to the destination using the current position and the link information;
Means for making a new recommended route to the destination using the current position and the link information when it is determined that the departure has not been continuously performed more than a predetermined number of times at an interval shorter than a predetermined distance. A navigation device characterized by that. A navigation device that is mounted on a vehicle and searches for a recommended route to a destination using link information included in map data, and performs route guidance to the destination according to the searched recommended route,
The link information is associated with the cost of the link and road identification information for identifying the road to which the link belongs, for each link,
Means for detecting the current position of the vehicle;
Means for determining whether the vehicle deviates from the recommended route using the detected current position, the searched recommended route, and map data;
When it is determined that the deviation has occurred,
Means for estimating a departure point using the current position and the map data;
A road associated with the departure point link in the recommended route is estimated using the current position and the map data, and the link of the departure point is estimated using the estimated departure point link and the link information. Means for extracting identification information and identifying the extracted road identification information as a monitoring target;
Means for re-searching a recommended route from the current position to the destination using the link information,
The means for re-searching the recommended route is:
When it is determined that the vehicle has deviated from the re-searched recommended route, it is determined whether the deviated recommended route includes a link associated with the identified road identification information. And
If it is determined that a link associated with the identified road identification information is included, whether or not the departure from the recommended route is continuously performed a predetermined number of times at an interval shorter than a predetermined distance. Judgment using the departure point and the map data,
When it is determined that the deviation is continuously performed a predetermined number of times or more at an interval shorter than a predetermined distance, the cost of the link associated with the specified road identification information in the link information is increased. Re-searching for a new recommended route to the destination using the current position and the link information;
When it is determined that the departure has not been continuously performed more than a predetermined number of times at an interval shorter than a predetermined distance, the recommended route to the destination is re-searched using the current position and the link information,
When it is determined that a link associated with the specified road identification information is not included, the recommended route to the destination is re-searched using the current position and the link information. Navigation device.

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