JP2005195451A - Route retrieval method of navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To retrieve a recommended route including toll roads requiring tolls corresponding to a reduction in time in the case of a route retrieval including toll roads. <P>SOLUTION: In the case that a retrieval with a preference, for example, for toll roads is requested, this navigation system newly retrieves a route which bypasses toll roads included in a retrieved route. Then a recommended route is finally determined from among the original route and a bypass route by threshold value determination processing on the basis of travel time and tolls. <P>COPYRIGHT: (C)2005,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.

  Patent Document 1 describes an in-vehicle navigation device that searches for a route from a departure place to a destination with priority on a toll road. When searching for a recommended route that minimizes the total cost, the technology described in Patent Document 1 sets the cost of a toll road to a lower value than other roads by multiplying the cost by a factor so that the toll road is easily adopted. It is a thing.

JP 2002-13937 A

  However, in the technique of Patent Document 1, there is a case where a route that employs a toll road that is not worth using is searched.

  For example, a route that bypasses a toll road is cheaper if it is not a detour in time, and can be said to be a route that meets the user's request. However, in the technique of Patent Document 1, there is a case where such a route can be searched for and a route including a toll road that costs a fee not commensurate with the reduction in time may be searched.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to perform a search in accordance with a user's request when a route search is performed with priority on a toll road.

  In order to solve the above problem, the route search method of the navigation device of the present invention newly searches for a route that avoids the toll road included in the searched route when searching with priority on the toll road. Then, a route satisfying a predetermined condition is determined as a recommended route from the original route and the avoidance route.

  For example, the navigation device includes a toll route search step for searching for a first route including a toll road from a departure point to a destination, and a toll road included in the first route searched in the toll route search step. An avoidance route search step for searching for a second route that avoids at least a part (section), a first route searched for by the toll route search step, and a second route searched by the avoidance route search step A recommended route specifying step for specifying a route satisfying a predetermined condition as a recommended route is performed.

  The navigation device may perform a threshold setting step of setting at least one of a threshold condition regarding travel time and a threshold condition regarding travel fee. Then, a route satisfying the threshold condition set in the threshold setting step is selected as a recommended route from the first route searched in the paid route search step and the second route searched in the avoidance route search step. It may be specified.

  ADVANTAGE OF THE INVENTION According to this invention, in the route search including a toll road, a toll road which is not worth using can be prevented from being adopted.

  An embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of an in-vehicle navigation device 1000 to which an embodiment of the present invention is applied. As shown in the figure, the in-vehicle navigation device 1000 of this embodiment 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, and a wheel speed sensor 6. , A geomagnetic sensor 7, a gyro sensor 8, and a GPS (Global Positioning System) receiver 9.

  The arithmetic processing unit 1 is a central unit that performs various processes. For example, the current location is detected based on information output from the various sensors 6 to 8 and the GPS receiver 9, and map data necessary for display is read from the map data storage device 3 based on the obtained current location information. Further, the read map data is developed in graphics, and a mark indicating the current location is superimposed on the map data and displayed on the display 2. In addition, using the current traffic data received from a beacon (not shown), an FM multiplex broadcasting station, a traffic information distribution center, etc. and the map data stored in the map data storage device 3, the destination and the current location indicated by the user ( The optimum route (recommended route) connecting to the departure place is searched, and the user is guided using the voice input / output device 4 and the display 2.

  The display 2 is a unit that displays graphics information generated by the arithmetic processing unit 1, and is configured by 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 Television System Committee) signal.

  The map data storage device 3 is composed of a storage medium such as a CD-ROM, DVD-ROM, HDD, or IC card. This storage medium stores map data, charge fee data, and the like.

  FIG. 2 is a diagram illustrating a configuration example of map data stored in the map data storage device 3. As shown in the figure, map data 310 is stored for each mesh region. The map data 310 includes a mesh area identification code (mesh ID) 311 and link data 312 of each link constituting a road included in the mesh area. The link data 312 includes a link identification code (link ID) 3121, coordinate information 3122 of two nodes (start node and end node) constituting the link, road type information 3123 including the link, and a link indicating the link length. Long information 3124, link travel time information 3125, link ID (connection link ID) 3126 of a link connected to each of the two nodes, and the like. Here, by distinguishing the start node and the end node for the two nodes constituting the link, the upward direction and the downward direction of the same road are managed as different links. The map data 310 also includes information (name, type, coordinate information, etc.) of map components other than roads included in the corresponding mesh area.

  The map data storage device 3 further stores toll data 340 used for calculating tolls for toll roads.

  The fee data 340 includes fee information 343 and 345 for each combination of an IN (entrance) side tollgate node ID 341 and an OUT (exit) side tollgate node ID 342, as shown in FIG. The node ID corresponds to the node ID 3122 of the link data 312.

  By the way, the toll road fee is not always proportional to the travel distance. Even if the entrance (IN) and exit (OUT) of the toll road are the same, the charge may differ depending on the route. Accordingly, the toll road charge is generally determined for each travel route.

  In other words, the charge fee data 340 includes a fee 345 for each waypoint 343 as shown in FIG. Further, if one waypoint is specified, one route is not always specified. One route may be specified by a plurality of waypoints. Therefore, in such a case, a route is specified by a route node ID 343 of a plurality of route points, and a charge is obtained.

  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, and recognizes the voice uttered by the user and transfers the content to the arithmetic processing unit 1.

  The input device 5 is a unit that receives an instruction from a user, and includes a hardware switch such as a scroll key and a scale change key, a joystick, a touch panel pasted on a display, and the like.

  The sensors 6 to 8 and the GPS receiver 9 are used for detecting the current location (own vehicle position) by the vehicle-mounted navigation device. The wheel speed sensor 6 measures the distance from the product of the wheel circumference and the measured number of rotations of the wheel, and further measures the angle at which the moving body is bent from the difference in the number of rotations of the paired wheels. The geomagnetic sensor 7 detects the magnetic field held by the earth and detects the direction in which the moving body is facing. The gyro 8 is configured by an optical fiber gyro, a vibration gyro, or the like, 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 GPS satellite and the rate of change of the distance with respect to three or more satellites to thereby determine the current location, travel speed, and travel direction of the mobile Measure.

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

  As illustrated, the arithmetic processing unit 1 has a configuration in which devices are connected by a bus 32. The arithmetic processing unit 1 includes a CPU (Central Processing Unit) 21 that executes various processes such as numerical calculation and control of each device, and a RAM (Random) that stores map data and arithmetic data read from the map data storage device 3. (Access Memory) 22, ROM (Read Only Memory) 23 for storing programs and data, DMA (Direct Memory Access) 24 for transferring data between the memories and between the memory and each device, and graphics drawing A drawing controller 25 that executes and controls display, a video random access memory (VRAM) 26 that stores graphics image data, a color palette 27 that converts image data into RGB signals, and an A that converts analog signals into digital signals / D converter 28 and SCI (Serial Commu) that converts serial signals into parallel signals synchronized with the bus nication interface) 29, a PIO (Parallel Input / Output) 30 for placing parallel signals on the bus in synchronization with the bus, and a counter 31 for integrating the pulse signal.

  FIG. 5 is a diagram illustrating a functional configuration of the arithmetic processing unit 1.

  As shown in the figure, the calculation processing unit 1 includes a user operation analysis unit 41, a route search unit 42, a route data storage unit 43, a route guidance unit 44, a map display processing unit 45, and a current position calculation unit 46. A map match processing unit 47, a data reading unit 48, a trajectory storage unit 49, a menu display processing unit 50, and a graphics processing unit 51.

  The current position calculation unit 46 uses distance data and angle data obtained as a result of integrating the distance pulse data S5 measured by the wheel speed sensor 6 and the angular acceleration data S7 measured by the gyro 8, respectively. The current position (X ′, Y ′), which is the position after the vehicle travels, is periodically calculated from the initial position (X, Y) and is output to the map match processing unit 47. . Here, in order to make the relationship between the rotation angle of the host vehicle and the traveling direction coincide, reference is made to the direction data S6 obtained from the geomagnetic sensor 7 and the angle data obtained by integrating the angular acceleration data S7 obtained from the gyro 8. Estimate the absolute direction of the direction in which the vehicle is traveling. In addition, since the error accumulates when the data of the wheel speed sensor 6 and the data of the gyro 8 are respectively integrated, the error accumulated based on the position data S8 obtained from the GPS receiver 9 in a certain time period is calculated. Processing for canceling is performed, and information on the current location is output to the map match processing unit 47.

  The map match processing unit 47 compares the map data around the current location read by the data reading unit 48 with the travel locus stored in the locus storage unit 49 described later, and the road (link) having the highest shape correlation. In addition, a map matching process is performed in which the current location periodically output from the current position calculation unit 46 is matched. Since the current position information obtained by the current position calculation unit 46 includes a sensor error, map matching processing is performed for the purpose of further improving the position accuracy. As a result, the current location often coincides with the traveling road.

  The trajectory storage unit 49 stores information on the current location on which the map match processing has been performed by the map match processing unit 47 as trajectory data every time the vehicle travels a predetermined distance. The trajectory data is used to draw a trajectory mark on the road on the map corresponding to the road that has been traveled so far.

  The user operation analysis unit 41 receives a request from the user input to the input device 5, analyzes the request content, and controls each unit of the arithmetic processing unit 1 so that processing corresponding to the request content is executed. To do. For example, when the user requests a search for a recommended route, the map display unit 45 is requested to display a map on the display 2 in order to set a destination, and further, from the current location (departure location) to the destination. Requests the route search unit 42 to calculate a route.

  The route search unit 42 uses a Dijkstra method or the like to search for a route that minimizes the cost (for example, travel time) of a route connecting two designated points (current location, destination). The recommended route obtained as a result is stored in the route data storage unit 43.

  The route guidance unit 44 performs route guidance using the route stored in the route data storage unit 43. For example, the route information and the current location information output from the map match processing unit 47 are compared, and the voice input / output device 4 is used to determine whether the vehicle should go straight before passing an intersection or the like. Tell the user.

  The data reading unit 48 reads, from the map data storage device 3, map data in an area that is required to be displayed on the display 2 or an area that is required for route search (an area that includes a departure place and a destination). Works to prepare.

  The map display processing unit 45 receives the map data in the area where display on the display 2 is requested from the map data storage device 3, and the graphic processing unit 51 uses the designated scale and drawing method for roads and other maps. A map drawing command is generated so as to draw a mark such as a component, a current location, a destination, and an arrow for a guide route.

  Upon receiving a command output from the user operation analysis unit 41, the menu display processing unit 50 generates a menu drawing command so that the graphic processing unit 51 draws various types of menus and graphs.

  The graphics processing unit 51 receives commands generated by the map display processing unit 45 and the menu display processing unit 50 and develops image data to be displayed on the display 2 on the VRAM 26.

  The on-vehicle navigation device 1000 configured as described above sets the cost of the toll road lower than that of other roads when searching for a route including toll roads (or compares the cost of other roads with that of the toll roads). Set a higher value) to search for a route from the departure point (current position) to the destination. If a toll road is included in the searched route, a route that bypasses the toll road is searched. Then, the recommended route is identified by comparing the detour route and the route including the original toll road from the viewpoint of travel time and toll fee.

  [Description of Operation] Next, the operation of the vehicle-mounted navigation device 1000 configured as described above will be described. FIG. 6 is a flowchart showing an outline of the flow of the route search process of the in-vehicle navigation device 1000 configured as described above.

  This flow is started when the route search unit 42 receives a route search request from the user.

  First, the route search unit 42 sets a departure point and a destination (S101). Specifically, the route search unit 42 receives an input of a departure point and a destination from the user via the input device 2. Input may be performed by character input, or a map may be displayed on the display 2 and specified on the map.

  Next, the route search unit 42 sets search conditions (S102). At this time, the route search unit 42 displays the search condition setting screen 210 on the display 2 via the menu display processing unit 50 as shown in FIG.

  In the present embodiment, there are a mode for performing route search with priority on toll roads, a mode for performing route search without particular priority on toll roads, and the like. Therefore, the search condition setting screen 210 displays options 212 and 214 for selecting these modes. The user can select the options 212 and 214 via the input device 5.

  The route search unit 42 sets the option selected by the user as a search condition.

  When it is set to perform route search without giving priority to the toll road (No in S102), the route search unit 42 performs route search without giving priority to the toll road (S120). Specifically, the route search unit 42 refers to the link travel time 3125 and the fee data 340 of the link data 312 and uses the travel time 3125 and the toll fee 345 as costs, and the cost from the departure point to the destination is the smallest. Is obtained by the Dijkstra method or the like. Then, the obtained route is set as a candidate route, and the required time is T1. When the candidate route includes a toll road, the total amount of the toll fee is calculated with reference to the toll fee data 340, and the calculated total amount is set as P1.

  Then, the route search unit 42 sets the candidate route as a recommended route, and stores it in the route data storage unit 43 together with the required time T1 and the required fee P1 (S130).

  On the other hand, when the route search is set so as to give priority to the toll road (No in S102), the route search unit 42 makes the route search easier to pass through the toll road (S104). Specifically, the route search unit 42 refers to the link travel time 3125 and the charge data 340 of the link data 312 and uses the travel time 3125 and the charge 345 as costs, and the cost from the departure point to the destination is minimized. The route is obtained by the Dijkstra method or the like. At this time, the cost of the link belonging to the toll road is set lower than the cost of the link belonging to the other road. For example, the cost consisting of the travel time 3125 and the fee 345 is multiplied by a cost coefficient (1 or less, for example, 0.5) to obtain the link cost. By doing so, toll roads are likely to be included in the recommended route.

  The route search unit 42 uses the obtained route as a candidate route, and sets the required time as T1. When the candidate route includes a toll road, the total amount of the toll fee is calculated with reference to the toll fee data 340, and the calculated total amount is set as P1.

Next, the route search unit 42 determines whether the candidate route obtained in S104 includes a toll road (S106). If the candidate route does not include a toll road (No in S106), the route search unit 42 proceeds to S130. Then, the route search unit 42 stores the candidate route as a recommended route in the route data storage unit 43 (S130).
On the other hand, when the candidate route includes a toll road (Yes in S106), the route search unit 42 performs candidate route review processing (S108 to S116). Here, the route search unit 42 obtains a toll road avoidance route and reviews whether or not each toll road included in the candidate route should be included in the recommended route.

  First, the search for the avoidance route (S108) will be described.

  FIG. 8 is a flowchart showing the flow of the avoidance route search process (S108).

  First, the route search unit 42 extracts toll road segments included in the candidate route (one toll road belonging to the same type of toll road is one segment) that has not been reviewed yet (S1081). . Here, the toll road section that has not been reviewed refers to the toll road section that has not undergone the review processing of S108 to S116 in FIG.

  Next, the route search unit 42 selects a toll road section closest to the destination from the toll road sections extracted in S1081, and sets the toll road section to be avoided (S1082). When the process of S108 is performed for the first time, there is no toll road section that has been reviewed. Therefore, in this case, the route search unit 42 becomes the toll road section to be avoided by the toll road section closest to the destination.

  Subsequently, the route search unit 42 determines whether there is a toll road section on the candidate route before the toll road section to be avoided (S1083). In a case (Yes in S1083), the route search unit 42 sets the exit of the toll road section immediately before the toll road section to be avoided on the candidate route as the point X.

The point X is not limited to the actual exit of the toll road section, and a point around the exit may be appropriately determined according to the actual situation. For example, it may be a merging point that exits a toll road exit on a toll road section and enters a general road, or may be a point where traffic congestion is alleviated if there is congested traffic near the merging point If there is no toll road section before the toll road section to be avoided (No in S1083), the departure place is set as the point X (S1085).

  Next, the route search unit 42 determines whether there is a toll road section next to the toll road section to be avoided on the candidate route (S1086). If there is (Yes in S1086), the route search unit 42 sets the entrance of the toll road section next to the toll road section to be avoided on the candidate route as the point Y (S1087).

  The point Y is not limited to the actual entrance of the toll road section, and a point around the entrance may be appropriately determined according to the actual situation. For example, it may be a merging point to the road leading to the toll gate on the toll road, or if there is a traffic jam near the merging point, it may be a point where the merging point is not in front of the traffic .

  On the other hand, when there is no toll road section next to the toll road section to be avoided (No in S1086), the destination is set as the point Y (S1088).

  When the point X and the point Y are set, the route search unit 42 searches for a route from the point X to the point Y and not including the toll road section to be avoided (S1089). Specifically, the route search unit 42 searches the route from the point X to the point Y using the Dijkstra method or the like using the travel time as the link cost without including the toll road section and using the Dijkstra method or the like.

  Next, the route search unit 42 replaces the candidate route from the point X to the point Y with the route from the point X to the point Y searched in S1089. Then, the obtained route is set as an avoidance route, and the process is terminated (S1090).

  Returning to FIG.

  The route search unit 42 sets T2 as the total required time of the obtained avoidance route and P2 as the total amount of the toll fee. The total amount P2 of the toll fee can be obtained by referring to the toll fee data 340 and calculating the total amount of the toll road included in the avoidance route.

  Next, the route search unit 42 performs threshold determination processing (S110, S112) for the required time and the toll fee.

  First, the route search unit 42 determines whether or not T2-T1 is smaller than a predetermined time threshold (for example, 1 hour) (S110). When T2-T1 is smaller than the time threshold (Yes in S110), the route search unit 42 sets the avoidance route as a candidate route. Further, the value of T2 is entered into T1, and the value of P2 is entered into P1 (S114).

  On the other hand, when T2-T1 is equal to or greater than the time threshold (No in S110), the route search unit 42 determines whether P1-P2 is equal to or greater than a predetermined charge threshold (for example, 1000 yen) (S112). When P1-P2 is equal to or greater than the charge threshold (Yes in S112), the route search unit 42 sets the avoidance route as a candidate route. Further, the value of T2 is entered into T1, and the value of P2 is entered into P1 (S114).

  On the other hand, when P1-P2 is smaller than the charge threshold (No in S112), the route search unit 42 proceeds to S116 as it is.

  Next, the route search unit 42 determines whether the candidate route includes a toll road that has not been reviewed (S116). If a toll road that has not been reviewed is included (Yes in S116), the route search unit 42 proceeds to S108 and searches for an avoidance route again.

  On the other hand, when a toll road section that has not been reviewed is not included (No in S116), the route search unit 42 proceeds to S130.

  Then, the route search unit 42 sets the candidate route as a recommended route and stores it in the route data storage unit 43 (S130).

  In S1089, when a route between the points XY that avoids the toll road section to be avoided is searched, a route including another new toll road may be searched. Even in this case, the recommended route can be finally obtained by applying the flows of FIGS. 6 and 8 and comparing the candidate route and the avoidance route.

  The route search process has been described above with reference to FIGS.

  Next, the route search process will be described with reference to FIGS. 9 and 10 showing a specific model.

  FIG. 9 is a diagram for explaining a case where a candidate route (a) including toll road sections A, B, and C is searched in S104 of FIG.

  As shown in the figure, the model of the route (a) includes toll road sections A, B, and C (dotted lines in the figure) between the departure point and the destination. For example, the entrance and exit of the toll road section are represented as Ain for the entrance of the toll road section A and Aout for the exit.

  A case where the review process (S108 to S116) is performed on the candidate route (a) will be described.

  First, the route search unit 42 extracts toll roads that have not been reviewed from the route (a) (S1081). In the route (a), toll road sections A, B and C are extracted.

  Next, the route search unit 42 selects the toll road section closest to the destination from the toll road sections extracted in S1081, and sets the toll road section to be avoided (S1082). In the route (a), the toll road section C is selected.

  Subsequently, the route search unit 42 determines whether or not there is a toll road section before the toll road section C on the candidate route (S1083). In the route (a), since the toll road B is in front of the toll road section C (Yes in S1083), the route search unit 42 sets the exit Bout of the toll road section B as the point X.

  Next, the route search unit 42 determines whether there is a toll road section next to the toll road section C on the candidate route (S1084). In route (a), since there is no toll road section next to toll road section C (No in S1084), the destination is set as point Y (S1088).

  When the point X and the point Y are set, the route search unit 42 searches for a route from the point X (Bout) to the point Y (destination) (S1089). For route (a), X1 shown in route (b) is searched.

  Next, the route search unit 42 replaces the candidate route (a) from the point X (Bout) to the point Y (destination) with the searched route X1. Then, the obtained route (b) is set as an avoidance route, and the avoidance route search process is terminated (S1090).

  When the process of S1090 ends, the route search unit 42 performs threshold determination processing S110 and S112 illustrated in FIG. 6 for the candidate route (a) and the avoidance route (b).

  When either of the threshold determination processes S110 and S112 is Yes, the route search unit 42 sets the avoidance route (b) as a candidate route (S114). Then, the route search unit 42 determines whether there is a toll road that has not been reviewed (S116). In the candidate route (b), since the toll road sections A and B have not been reviewed yet (Yes in S116), the route search unit 42 shifts the process to S108 and performs the avoidance route search process (S108) again. . This time, the avoidance route (c) is searched. Then, threshold determination processing S110 and S112 are performed together with the candidate route (b).

  On the other hand, if both the threshold determination processing S110 and S112 for the candidate route (a) and the avoidance route (b) are No, the route search unit 42 keeps the candidate route as the route (a) and Transition to processing. This time, a new avoidance route d is searched. Then, threshold determination processing S110 and S112 are performed for the candidate route (a) and the avoidance route (d).

  When the above processing is repeated, routes (b) to (g) as shown in FIG. 9 can be searched as avoidance routes based on the result of the threshold determination.

  FIG. 10 shows a flow until the candidate route is finally obtained by the threshold determination process. As shown in the figure, for example, when the threshold value determination between the candidate route (a) and the avoidance route (b) (S301) and the route (a) remains in the candidate route, the candidate route (a) In step d), a threshold value is determined (S302). When the route (d) becomes a new candidate route in S302, a threshold determination is performed on the candidate route (d) and the avoidance route (f) (S305). When the avoidance route (f) becomes a new candidate route in S305, the route (f) is specified as the recommended route.

  Similarly, any one of the routes (a) to (d) is specified as the recommended route based on the result of the threshold determination process (S301 to S306).

  The route search process has been described above.

  When the recommended route is searched, the route search unit 42 displays the recommended route on the display 2 via the menu display processing unit 50 as shown in FIG.

  On the screen 810, a recommended route 829 from the departure point 824 to the destination 825 is displayed on the map 820. The recommended route 829 passes through highways (toll roads) 826 and 820 between the interchangers 828a and 828b and between 828c and 828d, respectively.

  On the screen 810, a toll fee 831 and a required travel time 832 are also displayed.

  The traffic jam information 835 received from a beacon, an FM multiplex broadcasting station, or a traffic information distribution center may be displayed.

  The embodiment to which the present invention is applied has been described above.

  According to this embodiment, it is possible to search for a route more in line with the user's request.

  In addition, even when searching for a route by setting the cost of a toll road uniformly lower than that of other roads, by comparing with a route that bypasses the toll road, a route more in line with the user's request can be obtained. Can be explored. In other words, it is possible to perform a route search in which a toll road having no utility value or a toll road having a fee that does not meet the reduction in travel time is not adopted.

  In addition, the route using the toll road and the route avoiding the toll road are compared in terms of travel time and travel fee, so it is easy to recommend a recommended route that excludes toll roads that do not meet the reduction in travel time. Can be explored.

  In addition, when comparing a route using a toll road and a route avoiding the toll road, a threshold value is set and compared. Therefore, the comparison process is easy.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist.

  For example, the processing steps shown in FIGS. 6 and 8 can be changed in order within the scope of the present invention.

  For example, in the above-described embodiment, in the threshold determination process, the charge threshold is determined after determining the time threshold. However, this order may be reversed.

  Further, in the flow of FIG. 8, the point Y is set after the point X is set, but this order may be reversed.

  In S1082 shown in FIG. 8, the toll road closest to the destination is selected, but the toll road closest to the departure place may be selected.

  In addition to the time threshold value and the travel time threshold value, threshold value determination processing may be performed by providing a threshold value. For example, if a travel distance threshold is provided and the difference between the travel distance between the candidate route and the avoidance route exceeds a predetermined travel distance threshold, the candidate route is adopted as it is, and if not, the avoidance route is set as a new candidate route. May be set.

  It is also possible to change thresholds such as time thresholds and fee thresholds.

  For example, the user operation analysis unit 41 displays a threshold setting screen as shown in FIG. 12 on the display 2 via the menu display processing unit 50.

  On the threshold setting screen 500, a display for accepting input of the time threshold 512 and the charge threshold 522 is made. That is, the user can easily set the threshold by pressing the threshold increase / decrease buttons 514A, 514B, 524A, and 524B. In addition, messages 532 and 534 are displayed to help determine how to set the threshold value. The user operation analysis part 41 sets the value input by the user via the input device 5 as each threshold value.

  In this way, the threshold value can be set according to the user's preference. Then, it is possible to search for a reasonable route in consideration of the time to be saved and the degree of charge to be saved.

  In addition, the present embodiment can be modified as follows.

  In the above embodiment, avoidance routes are obtained one by one, and the obtained avoidance routes and candidate routes are compared by threshold determination processing. However, the present invention is not limited to this, and all avoidance routes may be obtained in advance, and thereafter, the first obtained candidate route and threshold determination processing may be performed.

  FIG. 13 is a diagram showing a flow of processing for obtaining a recommended route in such a case. As shown in the figure, the route search unit 42 determines whether the candidate route includes a toll road as in the above embodiment (S206). If included (Yes in S206), the route search unit 42 obtains all avoidance routes (S208). The process for obtaining the avoidance route can be performed in the same manner as the process shown in FIG. When the candidate route includes n toll roads, (n square -2) avoidance routes are searched. When all the avoidance routes are obtained, the route search unit 42 performs a threshold determination process with each candidate route for each avoidance route. In the case of Yes in either of the threshold determination processes S210 and S212, the route search unit 42 stores the avoidance route as a recommended route in the route data storage unit 43 (S214). When threshold determination processing is performed for all avoidance routes (S215), the route search unit 42 determines whether a recommended route has already been registered in the route data storage unit 43 (S216). If the avoidance route has already been registered as the recommended route, the processing is terminated as it is. On the other hand, when the recommended route is not registered, the route search unit 42 stores the candidate route as the recommended route in the route data storage unit 43 and ends the process.

  According to such route search processing, a plurality of recommended routes may be obtained depending on how the threshold is set. In such a case, a new threshold value may be provided, and one recommended route may be obtained by threshold value determination processing using this threshold value. Alternatively, the route with the shortest travel distance may be selected and narrowed down to one recommended route. Further, a plurality of recommended routes may be displayed on the display so that the user can select them.

  Further, the present embodiment can be modified as follows.

  In the above embodiment, the travel time 3122 of the link data 312 is used as the cost used for the route search. However, the present invention is not limited to this, and when current traffic information including the travel time of the link is obtained, a route search may be performed using the travel time as a cost.

  For example, the in-vehicle navigation device 1000 further includes a receiving device that receives traffic information from a beacon, an FM multiplex broadcasting station, a traffic information distribution center, and the like, and the current link travel time is included in the received traffic information. If so, the travel time is used for route search. Examples of the traffic information to be received include VICS information. In this way, the in-vehicle navigation device 1000 can search for a recommended route in consideration of the current traffic situation.

  In addition, although the example which applied this invention to the vehicle-mounted navigation apparatus was demonstrated, this invention is applicable also to navigation apparatuses other than vehicle-mounted.

FIG. 1 is a schematic configuration diagram of an in-vehicle navigation device 1000. FIG. 2 is a diagram illustrating a configuration example of map data stored in the map data storage device 3. FIG. 3 is a diagram illustrating a configuration example of fee data stored in the map data storage device 3. FIG. 4 is a diagram illustrating a hardware configuration of the arithmetic processing unit 1. FIG. 5 is a diagram illustrating a functional configuration of the arithmetic processing unit 1. FIG. 6 is a flowchart showing an outline of route search processing of the in-vehicle navigation device 1000. FIG. 7 is a diagram illustrating a display example of the search condition setting screen. FIG. 8 is a flowchart showing the flow of the avoidance route search process in S108 of FIG. FIG. 9 is a diagram illustrating candidate routes and avoidance route models for specifically explaining avoidance route search processing. FIG. 10 is a flowchart for specifically explaining the flow until the candidate route in the route model shown in FIG. 9 is specified. FIG. 11 is a diagram illustrating a display example of a recommended route. FIG. 12 is an example of a display screen that accepts changes in the time threshold and the travel threshold. FIG. 13 is a flowchart showing an outline of a modified example of the route search process shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Arithmetic processing part, 2 ... Display, 3 ... Data storage device, 4 ... Voice input / output device, 5 ... Input device, 6 ... Wheel speed sensor, 7 ... Geomagnetic sensor, 8 ... gyro, 9 ... GPS receiver, 11 ... in-vehicle LAN device, 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, 41 ... User operation analysis unit, 42 ... route search unit, 43 ... route data storage unit, 44 ... route guidance unit, 45 ... map display processing unit, 46 ... current position calculation unit, 47 ... Map match processing unit, 48 ... data reading unit, 49 ... trajectory storage unit, 50 ... Menu display processing unit, 51 ... Graphics processing unit

Claims (11)

A navigation device route search method,
The navigation device
A toll route search step for searching for a first route including a toll road section from a departure place to a destination;
An avoidance route search step for searching for a second route that avoids at least one of the toll road sections included in the first route searched in the toll route search step;
A recommended route specifying step for specifying, as a recommended route, a route satisfying a predetermined condition from the first route searched by the paid route search step and the second route searched by the avoidance route search step. A route search method for a navigation device, characterized in that: A navigation device route search method,
The navigation device
A threshold setting step for setting at least one of a threshold condition regarding travel time and a threshold condition regarding travel fee;
A toll route search step for searching for a first route including a toll road section from a departure place to a destination;
An avoidance route search step of searching for a second route that avoids at least one of the toll road sections included in the first route searched by the toll route search step;
A route that satisfies the threshold condition set in the threshold setting step is identified as a recommended route from the first route searched in the paid route search step and the second route searched in the avoidance route search step. A route search method for a navigation device, characterized by performing a recommended route specifying step. A navigation device route search method,
The navigation device
A storage device for storing link data of each link constituting the road on the map and information on the toll road;
A threshold setting step for setting at least one of a threshold condition regarding travel time and a threshold condition regarding travel fee;
Using the link data, a toll route searching step for setting a cost of a link belonging to a toll road to be lower than other links and searching for a first route with a minimum cost from the starting point to the destination;
When the first route searched by the toll route searching step includes a toll road section, an avoidance route search for searching for a second route that avoids at least one of the toll road sections included in the first route. Steps,
A route that satisfies the threshold condition set in the threshold setting step is identified as a recommended route from the first route searched in the paid route search step and the second route searched in the avoidance route search step. A route search method for a navigation device, characterized by performing a recommended route specifying step. A route search method for a navigation device according to claim 2 or 3,
In the avoidance route search step, when there are a plurality of second routes that avoid at least one of the toll road sections included in the first route,
A route search method for a navigation device, wherein a route that satisfies the threshold condition set in the threshold setting step is specified as a recommended route from the first route and a plurality of second routes. A route search method for a navigation device according to any one of claims 2 to 4,
The route search method for a navigation device, wherein the threshold relating to the travel time or the threshold relating to the travel fee is a threshold relating to a difference in travel time or a difference in travel fee. A navigation device route search method according to any one of claims 2 to 5,
The second route searched by the avoidance route search step is:
If there is a toll road section before and after the toll road section to be avoided on the first route,
A route from the starting point in the first route to the exit of the toll road section immediately before the toll road section to be avoided; and
A route from the exit of the toll road section immediately before the toll road section to be avoided to the entrance of the next toll road section of the toll road section to be avoided and avoiding the toll road section to be avoided When,
The route from the entrance of the toll road section next to the toll road section to be avoided in the first path to the destination,
If there is a toll road section in front of the toll road section to be avoided on the first route, but not after,
A route from the starting point in the first route to the exit of the toll road section immediately before the toll road section to be avoided;
It is a route from the exit of the toll road section immediately before the toll road section to be avoided to the destination and avoiding the toll road section to be avoided,
If there is no toll road section in front of the toll road section to be avoided on the first route,
A route from a departure place to the entrance of the next toll road section to be avoided to avoid the toll road section to be avoided;
A route search method for a navigation device, comprising: a route from an entrance of a toll road section next to the toll road section to be avoided in the first route to a destination. A navigation device route search method according to any one of claims 2 to 6,
The navigation device further includes:
Performing a threshold acceptance step for accepting input of the threshold condition;
The route search method for a navigation device, wherein the threshold setting step sets the threshold condition received in the threshold receiving step. A navigation device route search method according to any one of claims 2 to 7,
The navigation device further includes:
Perform the traffic information acquisition step to obtain the current travel time of the link,
The route search method of the navigation device, wherein the route search step performs a route search using a travel time of the current link acquired in the traffic information acquisition step as a link cost. A navigation device,
A toll route searching means for searching for a first route including a toll road section from a departure place to a destination;
Avoidance route search means for searching for a second route that avoids at least one of the toll road sections included in the first route searched by the toll route search means;
Recommended route specifying means for specifying, as a recommended route, a route satisfying a predetermined condition from the first route searched by the toll route search means and the second route searched by the avoidance route search means. A navigation device comprising: A navigation device,
Threshold setting means for setting at least one of a threshold condition regarding travel time and a threshold condition regarding travel fee;
A toll route searching means for searching for a first route including a toll road section from a departure place to a destination;
Avoidance route search means for searching for a second route that avoids at least one of the toll road sections included in the first route searched by the toll route search means;
A route satisfying the threshold condition set by the threshold setting unit is identified as a recommended route from the first route searched by the toll route searching unit and the second route searched by the avoidance route searching unit. A navigation device comprising recommended route specifying means. A navigation device,
A storage device for storing link data of each link constituting a road on the map and information on a toll road section;
Threshold setting means for setting at least one of a threshold condition regarding travel time and a threshold condition regarding travel fee;
A toll route searching means for searching for a first route with a minimum cost from the starting point to the destination by setting the cost of the link belonging to the toll road section lower than other links using the link data; ,
When the first route searched by the toll route searching means includes a toll road section, an avoidance route search for searching for a second route that avoids at least one of the toll road sections included in the first route. Means,
A route satisfying the threshold condition set by the threshold setting unit is identified as a recommended route from the first route searched by the toll route searching unit and the second route searched by the avoidance route searching unit. A navigation device comprising recommended route specifying means.

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