JP2009025137A - Navigation device and display method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation device for displaying a plurality of destination candidates suited to the situation of a user to perform guidance to a destination chosen by the user, since there may be cases where the user cannot be guided to a route suited to the user wherein some conventional on-vehicle navigation devices are equipped with the function of displaying routes to the principal road, even if it is not set as destination and such an on-vehicle navigation device performs route guidance so as to cover the nearest principal road in cases where the plurality of principal roads exist therearound, and therefore, the user cannot necessarily be guided to the desired destination by the user that suits the situation of the user. <P>SOLUTION: This navigation device is equipped with a means for extracting neighboring facilities, according to the present position and traveling state of the user to display a plurality of pieces of guidance information as destination candidates by means of icons on a screen, and receiving the choice of the user. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a navigation device and a display method thereof.

  Some conventional in-vehicle navigation devices have a function of displaying a route to a main road without being set as a destination.

JP 2001-141476 A

  In the navigation device of Patent Document 1, when there are a plurality of main roads in the vicinity, route guidance is performed on the nearest main road. Therefore, the navigation device may guide a route on a main road that the user does not want to be routed at a timing that does not match the driving situation. That is, there is a case where a route suitable for the user cannot be guided.

  An object of the present invention is to provide a navigation device that can intuitively guide a route suitable for a user.

  In order to solve the above-described problems, the navigation device of the present invention includes means for extracting a plurality of surrounding facilities and roads corresponding to the current position and traveling state of the user, and displaying them as destination candidates.

  For example, in a navigation device mounted on a vehicle, if the vehicle is strayed by a stray determination unit that determines whether the vehicle is strayed or not, the destination Destination candidate display means for selecting and displaying candidates.

  Further, for example, there is a display method for a navigation device mounted on a vehicle, wherein the navigation device is a stray determination step for determining whether or not the vehicle is strayed, and the stray determination step and the vehicle is strayed. A destination candidate display step of selecting and displaying a destination candidate when it is determined that the destination is present.

  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 100 to which an embodiment of the present invention is applied. As shown in the figure, the in-vehicle navigation device 100 includes an arithmetic processing unit 1, a display unit 2, a storage device 3, a voice input / output device 4, an input device 5, a ROM device 6, a vehicle speed sensor 7, A gyro sensor 8, a GPS (Global Positioning System) receiving device 9, an FM multiplex broadcast receiving device 10, and a beacon receiving device 11 are provided.

  The arithmetic processing unit 1 is a central unit that performs various processes. For example, the current position is detected based on information output from the various sensors 7 and 8, the GPS receiver 9, the FM multiplex broadcast receiver 10, and the beacon receiver 11. Further, based on the obtained current position information, link data, which is map data necessary for display, is read from the storage device 3 or the ROM device 6. Further, the read link data is developed in graphics, and a car mark indicating the current position is superimposed on the link data and displayed on the display unit 2. Further, by using the link table 500 that is link data stored in the storage device 3 or the ROM device 6, an optimum route (recommended route) that connects the starting point (current location) instructed by the user and the destination is searched. . Further, the user is guided using the voice input / output device 4 and the display 12.

  The display unit 2 is a unit that displays graphics information generated by the arithmetic processing unit 1, and includes a display 12 and a touch input detection device 13. The display 12 is composed of a CRT, a liquid crystal display, or the like.

  The touch input detection device 13 is a so-called touch panel that is mounted on the display side surface of the display 12 and transmits the display screen. The touch input detection device 13 specifies a touch position corresponding to the XY coordinates of the image displayed on the display 12, converts the touch position into coordinates, and outputs the coordinate. The touch input detection device 13 includes a pressure-sensitive or electrostatic input detection element.

  The storage device 3 is configured by at least a readable / writable storage medium such as an HDD or a nonvolatile memory card. In addition to the link table 500, which is link data necessary for a normal route search device, the storage medium includes a tourist facility table 600 that stores tourist facilities and their latitudes and longitudes, and a trajectory traveled by a mounted vehicle or the like. Are stored, a travel locus table 700 that stores information, a display object list 800 that stores objects to be displayed as destination candidates, and a display detail list 900 that stores detailed information necessary for displaying the display objects. Yes.

  FIG. 2 is a diagram showing the configuration of the link table 500. The link table 500 includes, for each mesh identification code (mesh ID) 501 that is a partitioned area on the map, link data 502 of each link constituting a road included in the mesh area.

  The link data 502 includes, for each link ID 5111, coordinate information 522 of two nodes (start node and end node) constituting the link, road type information 523 including the link, link length information 524 indicating the link length, link Travel time 525, link ID (connection link ID) 526 of a link connected to each of two nodes, common name 527 indicating a road name including the link (for example, “Kanhachi-dori”, etc.), road width of the road including the link 528 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 link travel time 525 may be a link travel time associated with each condition such as date and weather.

  FIG. 3 is a diagram illustrating a configuration of the tourist facility table 600. The tourist facility table 600 includes information of a tourist facility name 601 and coordinates 602 for each record. A tourist facility name 601 is a name or name of a tourist facility. The coordinates 602 are latitude / longitude coordinates such as a position where the tourist facility exists, an entrance position, and a parking lot position.

  The tourist facility table 600 stores the record in advance. However, records are added / deleted / changed by maintenance such as version upgrade.

  FIG. 4 is a diagram showing the configuration of the travel locus table 700. As shown in FIG. The travel locus table 700 includes information of a travel time 701 and a travel link ID 702 for each record. The travel time 701 is the time when travel is completed for the link. The travel link ID 702 is an ID of the link of the road that has traveled. Based on the link ID stored in the travel link ID 702, as shown in the link table 500 of FIG. 2, the upward direction and the downward direction of the same road can be distinguished.

  FIG. 5 is a diagram showing the configuration of the display target list 800. The display target list 800 includes information of a common name 801 and coordinates 802 for each record. A common name 801 is a common name for facilities and roads, and a coordinate 802 is one of latitude and longitude coordinates indicating the positions of the facilities and roads.

  FIG. 6 is a diagram showing the configuration of the display detail list 900. The display detail list 900 includes information of a common name 901, icon display coordinates 902, and direction 903 for each record. A common name 901 is a common name for facilities and roads, and an icon display coordinate 902 is the latitude / longitude of the center position of an icon when icons for indicating the existence of those facilities and roads are superimposed on the screen. Coordinates. A direction 903 is an angle formed by the arrow with respect to the north when the symbol of the arrow to be displayed at the left end of the icon is displayed. The direction 903 is assumed to store an angle by a power method expressed by a power from 0 ° to 360 °, but may be expressed by another angle such as an arc method.

  Returning to FIG. 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. Also, a process of recognizing the voice uttered by the user and transferring the contents to the arithmetic processing unit 1 is performed.

  The input device 5 is a unit that receives instructions from the user. The input device 5 includes hardware switches such as a scroll key and a scale change key, a joystick, and the like.

  The ROM device 6 is composed of at least a readable storage medium such as a CD-ROM, DVD-ROM, or IC card. In this storage medium, for example, moving image data, audio data, and the like are stored.

  The vehicle speed sensor 7, the gyro sensor 8, the GPS receiving device 9, and the beacon receiving device 11 are used by the in-vehicle navigation device 100 to detect the current position (own vehicle position). The vehicle speed sensor 7 calculates the travel distance from the number of rotations of the wheel and the wheel circumference within a predetermined period, calculates the travel speed of the vehicle by dividing the travel distance by the predetermined period, and further rotates the pair of wheels. The angle at which the moving body is bent is measured from the difference in number. The gyro sensor 8 is composed of 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 position, travel speed, and travel of the mobile body. It measures the direction.

  The FM multiplex broadcast receiving apparatus 10 is a general current traffic information, regulation information, SA / PA (service area / parking area) information, parking lot information, and the like sent from an FM multiplex broadcast station such as VICS information as an FM multiplex broadcast signal. Receive weather information.

  The beacon receiving device 11 receives current traffic information, regulation information, SA / PA information, parking lot information, and the like sent from the beacon.

  FIG. 7 is a functional block diagram of the arithmetic processing unit 1.

  As shown in the figure, the arithmetic processing unit 1 includes a main control unit 101, a proposal start determination unit 102, a destination selection unit 103, a destination display unit 104, a proposed destination guidance unit 105, and an input reception unit 106. And an output unit 107.

  The main control unit 101 is a central functional unit that performs various processes, and controls other processing units according to the processing content. The main control unit 101 also performs navigation processing (for example, display of traffic information, display of current position, route search, route guidance, etc.), which is the original basic operation of the in-vehicle navigation device 100. Further, the current time is output in response to a request from each processing unit.

  The proposal start determination unit 102 is a functional unit that determines whether to propose a destination. It also has a function of determining the type of destination to be proposed. For example, the type of destination to be proposed is a main road or the like when traveling on a narrow street, or when traveling on the same road many times after getting lost during traveling. For example, when a tourist facility exists in the vicinity, it is the tourist facility.

  The destination selection unit 103 is a functional unit that specifically selects a destination according to the type of destination determined by the proposal start determination unit 102. The destination selection unit 103 selects a destination using the link table 500 and the tourist facility table 600.

  The destination display unit 104 displays the destination selected by the destination selection unit 103 by calculating the display position of an icon indicating the destination according to the distance from the center of the screen to the destination and the direction thereof. This is a functional unit to be displayed on the unit 2. More specifically, the destination display unit 104 converts the distance from the center position of the screen to the destination into a ratio with a predetermined distance, and displays the display position on the screen of the display 2 according to the ratio. Candidates are calculated. Further, the destination display unit 104 sets the display position candidate in the direction of the destination from the center position of the screen as a display position, and displays an icon including the common name of the destination at the display position to the output unit 107 described later. To display.

  The proposed destination guidance unit 105 is a functional unit that performs route guidance to the destination indicated by the icon selected by the user via the touch input detection device 13. Specifically, the proposed destination guidance unit 105 receives a user's selection operation for the icon displayed by the destination display unit 104 via an input reception unit 106 described later. Then, the proposed destination guidance unit 105 requests the main control unit 101 to search for a route from the current location to the destination, using the destination indicated by the selected icon as the destination, the current vehicle position as the current location, The main control unit 101 is requested to perform route guidance for the searched route.

  The input reception unit 106 is a functional unit that receives input information from the user by the voice input / output device 4, the input device 5, and the touch input detection device 13.

  The output unit 107 is a functional unit that instructs the display unit 2 and the voice input / output device 4 to indicate information to the user.

  FIG. 8 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 Access Memory) that stores link data, arithmetic data, and the like read from the storage device 3. ) 22, a ROM (Read Only Memory) 23 for storing programs and data, a DMA (Direct Memory Access) 24 for transferring data between the memories and between the memory and each device, and graphics drawing. In addition, a drawing controller 25 that performs display control, 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 / D that converts analog signals into digital signals. Converter 28 and SCI (Serial Communication Int) that converts serial signals into parallel signals synchronized with the bus. erface) 29, a PIO (Parallel Input / Output) 30 that puts a parallel signal on the bus in synchronization with the bus, and a counter 31 that integrates the pulse signal.

  Each component and function described above is achieved by the CPU 21 executing a program loaded into the RAM 22 or ROM 23.

  [Description of Operation] Next, the operation of the in-vehicle navigation device 100 having the above-described configuration will be described.

  FIG. 9 is a flowchart showing the overall flow of the destination proposal process.

  The main control unit 101 starts this flow when the in-vehicle navigation device 100 is activated.

  The main control unit 101 receives the current position of the vehicle (step S110). Specifically, the main control unit 101 receives the current position of the vehicle by the GPS receiver 9, the FM multiplex broadcast receiver 10, and the beacon receiver 11, and determines the current position of the vehicle based on these. To do.

  The main control unit 101 determines whether or not to start a proposal by performing a proposal start determination process (step S111). Specifically, the current position of the vehicle acquired in step S110 is transferred to the proposal start determination unit 102, and an instruction is given to perform a proposal start determination process described later, and the return value is a vagus flag, a narrow street flag, a tourist spot Get the flag.

  The main control unit 101 determines whether or not to start a proposal based on each flag acquired in step S111 (step S112). Specifically, the main control unit 101 determines that the proposal is started (Y in the determination of step S112) when any of the flags is set to a true value. Otherwise, it is determined that the proposal is not started (N in step S112), and the process returns to step S110.

  When it is determined that the proposal is to be started (Y in step S112), the main control unit 101 initializes the records to be stored in the display target list 800 and the display detail list 900, and the destination selection unit 103 Each flag and the current position of the vehicle are transferred, and an instruction is given to carry out destination selection processing described later. Then, the main control unit 101 receives the display target list 800 in which the destination selected by the destination selection unit 103 and its coordinate information are stored (step S113).

  The main control unit 101 delivers the received display target list 800 to the destination display unit 104, and instructs the destination display unit 104 to perform a destination display process described later (step S114).

  Then, the main control unit 101 receives the display detail list 900 created by the destination display unit 104, and monitors the selection input for the destination candidate icons displayed on the display unit 2 by the destination display unit 104 (step). S115). Specifically, the main control unit 101 monitors inputs of the voice input / output device 4, the input device 5, and the touch input detection device 13 via the input receiving unit 106. When the main control unit 101 receives an operation for selecting the icon, for example, an input operation such as placing the cursor on the icon and inputting a decision key, the proposed destination is selected (Y in step S115). ). Otherwise, it is determined that there is no destination selection (N in step S115), and the process is performed again from step S110.

  If it is determined that the destination has been selected, the main control unit 101 delivers the display target list 800 and the display detail list 900 to the proposed destination guidance unit 105, and a proposed destination guidance process described later. To instruct When the proposed destination guidance process ends, the process returns to step S110, and the process is performed again (step S116).

  Next, the above-described proposal start determination process (S111 in FIG. 9) will be described with reference to FIG.

  FIG. 10 is a flowchart showing the flow of the proposal start determination process.

  First, the proposal start determination unit 102 creates, as initialization processing, a vagus flag, a narrow street flag, and a sightseeing spot flag, which are variables for storing a true / false value, on the RAM 22 and sets False to the value. (Step S001).

  Next, the proposal start determination unit 102 requests and obtains the current time from the main control unit 101, and within a predetermined time (for example, 1 hour) from the current time, a predetermined number of times (for example, 3 times) or more. It is determined whether there is a passed link (step S002). That is, in step S002, when there is a link that has passed a predetermined number of times within a predetermined time, it is determined that the user is lost.

  If the result of determination in step S002 is that the relevant link exists (Y in step S002), the proposal start determination unit 102 sets True to the stray flag initialized in step S001 (step S003).

  The proposal start determination unit 102 searches the link table 500 based on the current position of the vehicle, determines the attribute of the road of the link to which the current position of the vehicle belongs, and determines whether the road is a narrow street (step) S004). Specifically, the proposal start determination unit 102 searches the link table 500 to identify a link ID that includes the coordinates of the current position of the vehicle. Then, the proposal start determination unit 102 acquires values of the road type 523 and the road width 528 from the link attribute information determined by the specified link ID. The proposal start determination unit 102 determines that the value of the road type 523 is lower than a predetermined rank (for example, less than a prefectural road), and the road width 528 is smaller than a predetermined width (for example, less than 2.7 m). In some cases, it is determined that the road is a narrow street.

  Alternatively, the suggestion start determination unit 102 determines that the value of the road type 523 is lower than a predetermined rank (for example, less than a prefectural road), and the road width 528 is narrower than a predetermined width (for example, 2.7 m). If the predetermined time (for example, 5 minutes) has elapsed since entering the link, it may be determined that the road is a narrow street.

  If the result of determination in step S004 is a narrow street (Y in step S004), the proposal start determination unit 102 sets True to the narrow street flag initialized in step S001 (step S005).

  The proposal start determination unit 102 searches the tourist facility table 600 based on the current position of the vehicle, and determines whether or not the tourist facility exists within a predetermined distance from the current position of the vehicle (step S006). Specifically, the proposal start determination unit 102 determines from the tourist facility table 600 that a predetermined number or more (for example, one or more) of tourist facilities that are within a predetermined distance (for example, within a straight distance of 2 km) from the coordinates of the current position of the vehicle. It is determined whether or not there is.

  When the result of determination in step S006 is that there are more than a predetermined number of tourist facilities (Y in step S006), the proposal start determination unit 102 sets True for the tourist destination flag initialized in step S001 (step S007). .

  The above is the proposal start determination process. In this way, the proposal start determination unit 102 determines whether or not to make a proposal in accordance with the situation where the vehicle is placed in the proposal start determination process, and what kind of destination is to be used when making a proposal. Various flag information used when determining whether or not.

  Next, the destination selection process (S113 in FIG. 9) will be described with reference to FIG.

  FIG. 11 is a flowchart showing the flow of destination selection processing.

  As described above, the destination selection unit 103 determines whether either the stray flag or the narrow street flag is set to True from the various flags received from the main control unit 101 (step S101). ). As a result of the determination, if it is set to True (Y in Step S101), the following steps S102 to S104 are performed. Otherwise, steps S102 to S104 are not performed, and the process is restarted from step S105.

  As a result of the determination in step S101, when either the stray flag or the narrow street flag is set to True (Y in step S101), the destination selection unit 103 is within a predetermined distance from the current position of the vehicle ( For example, a link ID of a road that is equal to or more than a prefectural road within a straight distance (within 2 km) and coordinates of a point closer to the current position of the vehicle among nodes constituting both ends of the link are calculated (step S102). . Specifically, the destination selection unit 103 extracts from the link table 500 a link in which at least one of the nodes at both ends of the link exists within a predetermined linear distance from the vehicle position of the vehicle. Further, the destination selection unit 103 further includes, among the extracted links, the link ID of a link whose road type 523 is a predetermined rank or higher (for example, a prefectural road or higher), and a node indicating both ends of the link A plurality of coordinates (latitude / longitude) of a node closer to the current position of the vehicle are acquired.

  And the destination selection part 103 acquires the common name 527 for every link acquired by step S103 from the link table 500 (step S103).

  The destination calculation unit 103 uses the coordinates of the node acquired in step S102 and the common name of the link acquired in step S103 as one case, and includes a plurality of coordinates 802 and common name 801 of the display target list 800, respectively. Records (step S104).

  Next, the destination selection unit 103 determines whether or not the tourist destination flag is set to True from various flags received from the main control unit 101 (Step S105). If the result of determination is true (Y in step S105), the following steps S106 and S107 are performed. Otherwise, steps S106 and S107 are not performed and the process ends.

  As a result of the determination in step S105, when the tourist destination flag is set to True (Y in step S105), the destination selection unit 103 is within a predetermined distance from the current position of the vehicle (for example, within 2 km as a linear distance). ) And the coordinates of the facility are acquired (step S106). Specifically, the destination selection unit 103 acquires the tourist facility name 601 and coordinates 602 of the tourist facility existing within a predetermined straight distance from the vehicle position of the vehicle from the tourist facility table 600.

  Then, the destination calculation unit 103 adds a plurality of items to the common name 801 and the coordinates 802 of the display target list 800, with the tourist facility name and coordinates of the tourist facility acquired in step S106 as one item. Store (step S107).

  The above is the destination selection process. In this manner, the destination selection unit 103 specifically identifies the destination according to the situation where the vehicle is placed in the destination selection process, and sets the destination to be displayed in the list.

  Next, the destination display process (S114 in FIG. 9) will be described with reference to FIGS.

  12 and 13 are flowcharts showing the flow of the destination display process.

  The destination display unit 104 creates a variable I (I is a natural number) that is a loop counter on the RAM 22, and sets 0 to I as an initialization process (step S201).

  The destination display unit 104 advances the counter by incrementing the value of the variable I by 1 (step S202).

  The destination display unit 104 acquires the coordinates 802 of the record stored in the I item of the display target list 800, and calculates a variable d (d is a natural number) that is a linear distance between the coordinates and the current position of the vehicle. (Step S203).

  The destination display unit 104 divides the linear distance d represented by the variable d obtained in step S203 by a predetermined distance (for example, 2 km), and the result is currently displayed by the in-vehicle navigation device 100. A predetermined distance (for example, 0.3 km) derived from the scale is integrated to calculate a variable r (r is a natural number) that is a virtual radius (step S204).

  That is, the virtual radius r is expressed by the following formula (1).

Virtual radius r = d / predetermined distance × predetermined distance derived from the scale (1)
Then, the destination display unit 104 includes a straight line connecting the coordinates 802 of the record stored in the I item of the display target list 800 and the coordinates of the center of the screen currently displayed by the in-vehicle navigation device 100. Then, two coordinates of the intersection of the circle having the virtual radius r calculated in step S204 as the radius with the center coordinate of the screen as the center of the circle are calculated (step S205).

  Then, the destination display unit 104 displays the coordinates of the intersection closest to the coordinates of the record stored in the I-th item of the display target list 800 among the two coordinates of the intersection calculated in step S205. The points are stored on the RAM 22 (step S206).

  Next, the destination display unit 104 starts from the coordinates of the center of the screen currently displayed on the in-vehicle navigation device 100 to the display segment stored in the RAM 22 in step S206 and the north from the center of the screen. An angle θ formed by the straight line heading toward is calculated (step S207). For example, θ is calculated by a frequency method from 0 ° to 360 °.

  The destination display unit 104 includes a common name 801 of the record stored in the I item of the display target list 800, the coordinates of the display center point calculated in step S206, and the angle θ calculated in step S208. Are stored in the common name 901, icon display coordinates 902, and direction 903 of the display detail list 900, respectively (step S208).

  The destination display unit 104 determines whether or not the value of I is the same as the number of cases included in the display target list 800 (step S209). If they are not identical in the determination in step S209 (N in step S209), the destination display unit 104 re-executes the process from step S202. If the determinations in step S209 are the same (Y in step S209), step S210 shown in FIG. 13 is executed.

  The destination display unit 104 creates a variable J (J is a natural number), which is a loop counter, on the RAM 22, and sets J to 0 as an initialization process (step S210).

  The destination display unit 104 advances the counter by incrementing the value of the variable J by 1 (step S211).

  The destination display unit 104 is commonly referred to the coordinates stored in the J icon display coordinates 902 in the display detail list 900 created in step S208 with respect to the display unit 2 via the output unit 107. An icon including the common name stored in 901 in its display area is displayed (step S212).

  In addition, the destination display unit 104 provides the display unit 2 via the output unit 107 with the angle θ included in the J direction 903 in the display detail list 900 created in step S208, and the north. An arrow image having the same angle with respect to the direction is created and superimposed on the left end of the icon displayed in step S212 (step S213).

  The destination display unit 104 determines whether or not the value of J is the same as the number of cases included in the display detail list 900 (step S214). If they are not identical in the determination in step S214 (N in step S214), the destination display unit 104 re-executes the process from step S211. If the determinations in step S214 are the same (Y in step S214), subsequent step S215 is executed.

  The destination display unit 104 causes the cursor to focus-display on the icon that has the shortest path from the current position of the vehicle among the icons displayed in steps S212 and S213 via the output unit 107 (step S215). ).

  The above is the destination display process. Thus, the destination display unit 104 displays the destination to be displayed as an icon on the display 12 of the display unit 2 in the destination display process.

  Next, the proposed destination guidance process (S116 in FIG. 9) will be described with reference to FIG.

  FIG. 14 is a flowchart showing the flow of the proposed destination guidance process.

  The proposed destination guidance unit 105 acquires the common name displayed on the selected icon via the input unit 106 and the main control unit 101 (step S301).

  The proposed destination guidance unit 105 searches the display target list 800 for the common name 801 in order, and acquires the coordinates 802 of the record that matches the common name acquired in step S301 (step S302).

  The proposed destination guidance unit 105 requests the main control unit 101 to search for a route from the current location to the destination using the coordinates acquired in step S302 as the destination and the current position of the vehicle as the current location (step S303).

  Then, when the route search processing requested by the main control unit 101 in step S303 is completed, the proposed destination guidance unit 105 requests the main control unit 101 to perform route guidance processing for the route, and the main control unit 101 Conduct the guidance process. Then, when the route guidance process ends, the proposed destination guidance process also ends (step S304).

  The above is the proposed destination guidance process. As described above, the proposed destination guidance unit 105 performs route guidance to the selected destination in the proposed destination guidance processing.

  FIG. 15 is a diagram illustrating an example of a screen displayed by the above destination display process.

  FIG. 15 shows an example of a screen 1000 displayed on the display 12 after step S215 of the destination display process is processed.

  The screen 1000 is an icon 1001 that is a car mark indicating the current position of the vehicle, an icon 1010 that has XX park as a proposed destination, an icon 1020 that has a proposed destination in Koshu Kaido, and a proposed purpose This is a screen for displaying the icon 1030 as the ground.

  The icon 1030 whose proposed destination is Ringhadori has an icon main body 1031, a common name display area 1032, and a direction display area 1033. Of course, these are areas common to the icon 1010 having the XX park as the proposed destination and the icon 1020 having the Koshu Kaido as the proposed destination.

  The screen 1000 indicates that xx park exists in the diagonally upper left direction from the center of the screen from the position of the icon 1010 and the direction display area 1033 in the icon. Similarly, the screen 1000 indicates that the link closest to the Koshu Kaido exists in the upper right direction from the center of the screen, and the link closest to Kanpachi-dori exists in the lower right direction from the screen center. In addition, it can be said that the screen 1000 intuitively indicates the presence of Koshu Kaido, Kanpachi-dori, and xx parks in order from the closest to the straight line distance by the distance of the icon from the center of the screen.

  The embodiment of the present invention has been described above.

  The present invention is not limited to the above embodiment. The above embodiment can be variously modified within the scope of the technical idea of the present invention.

  For example, in the above-described embodiment, what is accepted in step S115 of the destination proposal process is an instruction to select a destination icon, but is not limited thereto.

  That is, for example, the main control unit 101 displays a display cancel button after the destination display processing in step S114. When the main control unit 101 receives an operation for the display cancel button in step S115, the main control unit 101 deletes all the icons displayed in the destination display process S114, and returns to step S110 to execute again. Good. Alternatively, the main control unit 101 may perform processing by accepting an operation on the display cancel button by accepting an input from a display cancel button provided as a hardware switch in the input device 5. Thereby, when the said destination proposal function is not required, the display by the said function can be canceled.

  Further, for example, after the icon is displayed in step S213, the destination display unit 104 further displays a straight line distance to the destination indicated by the icon at a predetermined position in the icon (for example, the right side of the common display area). May be displayed. Thereby, more information can be shown to the user about the proposed destination.

  Furthermore, for example, a predetermined upper limit may be provided for the number of records in the display target list 800. As a result, when there are a large number of display objects, it is possible to prevent adverse effects such as excessive icon display and confusion for the user.

  Furthermore, in step S212 of the destination display process, depending on the coordinates at which the icon is displayed, the display may be hidden by another icon. In this case, the display may not be superimposed. The display position may be shifted according to the height and width of the icon. By doing so, it is possible to reduce the inconvenience that icons cannot be read or cannot be selected due to overlapping.

  Still further, for example, in step S002 of the proposal start determination process shown in FIG. For example, in this step, the proposal start determination unit 102 requests and obtains the current time from the main control unit 101, and within a predetermined range (for example, 1 hour) from the current time (for example, It is determined whether or not only in the same town) has moved at a predetermined average speed or higher (for example, 10 km / h or higher) (step S002). That is, in step S002, if the vehicle moves only within a predetermined range at a predetermined average speed or more within a predetermined time, it may be determined that the user is lost.

  Also, for example, in the processing from step S205 to step S207 of the destination display processing shown in FIG. 12, the coordinates and angle for displaying the destination are calculated using the coordinates of the center of the screen. You may calculate the said coordinate and angle using the coordinate which shows the own vehicle position.

  In the above case, in step S205, the destination display unit 104 displays the straight line connecting the coordinates 802 of the record stored in the I-th item of the display target list 800 and the coordinates of the current position of the vehicle, Two coordinates of the intersection of the current position of the vehicle and the circle having the virtual radius r calculated in step S204 as the radius are calculated (step S205).

  After the processing in step S206, in step S207, the destination display unit 104 moves from the coordinates of the current position of the vehicle toward the display center point stored in the RAM 22 in step S206, and the north from the current position of the vehicle. An angle θ formed by the straight line heading toward is calculated (step S207). For example, θ is calculated by a frequency method from 0 ° to 360 °.

  Thereby, an icon can be shown centering on the own vehicle position, and it can operate more intuitively.

  Further, for example, in the process of step S215 of the destination display process shown in FIG. 13, the cursor may be focused on the icon that is present in the direction closest to the direction in which the host vehicle is facing. Specifically, in step S215, the destination display unit 104, via the output unit 107, among the icons displayed in steps S212 and S213, the direction indicated by the front direction of the vehicle and the current position of the vehicle The cursor is displayed in focus on the icon having the smallest direction from the icon display position (step S215). Thereby, the user can easily select a destination close to the current traveling direction.

  In the above embodiment, an example in which the present invention is applied to a vehicle-mounted navigation device has been described. However, the present invention can also be applied to a navigation device other than a vehicle-mounted navigation device.

FIG. 1 is a schematic configuration diagram of an in-vehicle navigation device to which an embodiment of the present invention is applied. FIG. 2 is a diagram illustrating a configuration example of a link table stored in the storage device. FIG. 3 is a diagram illustrating a configuration example of a tourist facility table stored in the storage device. FIG. 4 is a diagram illustrating a configuration example of a travel locus table stored in the storage device. FIG. 5 is a diagram illustrating a configuration example of a display target list stored in the storage device. FIG. 6 is a diagram illustrating a configuration example of a display detail list stored in the storage device. FIG. 7 is a diagram illustrating a functional configuration of the arithmetic processing unit. FIG. 8 is a diagram illustrating a hardware configuration of the arithmetic processing unit. FIG. 9 is a flowchart of the destination proposal process. FIG. 10 is a flowchart of the proposal start determination process. FIG. 11 is a flowchart of destination selection processing. FIG. 12 is a flowchart of the first half of the destination display process. FIG. 13 is a flowchart of the latter half of the destination display process. FIG. 14 is a flowchart of the proposed destination guidance process. FIG. 15 is a diagram illustrating an example of a screen displayed by the destination display process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Arithmetic processing part, 2 ... Display part, 3 ... Memory | storage device, 4 ... Audio | voice input / output device, 5 ... Input device, 6 ... ROM apparatus, 7 ... Vehicle speed sensor, 8 ... Gyro, 9 ... GPS receiver, 10 ... FM multiplex broadcast receiver, 11 ... beacon receiver, 12 ... display, 13 ... touch input detector, 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, 100 ... In-vehicle navigation device, 101 ... Main control unit, 102 ... Proposal start determination unit, 103 ... Destination selection unit, 104 ... Destination display unit, 105 ... Proposed destination guidance unit, 106 ... Input reception unit, 107 ... Output unit

Claims (17)

A navigation device mounted on a vehicle,
A stray determination means for determining whether the vehicle is stray;
Destination candidate display means for selecting and displaying destination candidates when it is determined by the vagus determination means that the vehicle is straying;
A navigation device comprising: The navigation device according to claim 1,
further,
A route guidance unit that accepts a selection operation for the destination candidate displayed by the destination candidate display unit, searches for a route to the accepted destination candidate, and performs guidance
A navigation device comprising: The navigation device according to claim 1,
The stray determination means determines that the vehicle is strayed because the vehicle has traveled the same road more than a predetermined number of times within a predetermined time.
A navigation device characterized by that. The navigation device according to claim 1,
The stray determination means determines that the vehicle is stray when the type and width of the road on which the vehicle exists satisfies a predetermined condition.
A navigation device characterized by that. The navigation device according to claim 1,
The stray determination means determines that the vehicle is straying because the vehicle has moved only within a predetermined range at a speed equal to or higher than a predetermined average speed within a predetermined time.
A navigation device characterized by that. The navigation device according to claim 1,
When the vagus determination means satisfies a predetermined condition of a road type and a road width where the vehicle exists, and a predetermined time has elapsed since the vehicle entered the road,
Determining that the vehicle is straying
A navigation device characterized by that. The navigation device according to claim 3, 4, 5 or 6,
The destination candidate display means selects a main road within a predetermined distance from the current position of the vehicle when selecting the destination candidate.
A navigation device characterized by that. A navigation device mounted on a vehicle,
A sightseeing spot traveling determination means for determining whether or not the vehicle is traveling in a tourist area;
Destination candidate display means for selecting and displaying destination candidates when it is determined by the tourist destination traveling determination means that the vehicle is traveling in a tourist area;
A navigation device comprising: The navigation device according to claim 8,
The sightseeing spot traveling determination means determines that the vehicle is traveling in a tourist area when a predetermined tourist facility exists within a predetermined distance from the current position of the vehicle.
A navigation device characterized by that. The navigation device according to claim 9,
The destination candidate display means selects a predetermined tourist facility within a predetermined distance from the current position of the vehicle;
A navigation device characterized by that. A navigation device mounted on a vehicle,
A stray determination means for determining whether the vehicle is stray;
A sightseeing spot traveling determination means for determining whether or not the vehicle is traveling in a tourist area;
A destination candidate is selected and displayed when it is determined that the vehicle is traveling in a sightseeing spot by the sightseeing spot traveling determination means, or when the vehicle is straying by the stray running determination means. Destination candidate display means,
A navigation device comprising: The navigation device according to claim 11,
The destination candidate display means includes
When it is determined by the vagus determination means that the vehicle is vain, select a main road within a predetermined distance from the current position of the vehicle,
When it is determined that the vehicle is traveling in a sightseeing spot by the sightseeing spot traveling determination means, a predetermined tourist facility within a predetermined distance from the current position of the vehicle is selected,
The selected main road and the selected tourist facility are displayed together.
A navigation device characterized by that. The navigation device according to claim 1,
The destination candidate display means displays the destination candidate according to the direction in which the destination candidate exists and the distance to the destination candidate when displaying the destination candidate. To
A navigation device characterized by that. A navigation device according to claim 13,
The destination candidate display means displays the destination candidate as an icon when displaying the guidance,
Furthermore, the icon is displayed at a position away from the center of the screen as the distance to the destination candidate increases.
A navigation device characterized by that. 15. The navigation device according to claim 14, wherein
The destination candidate display means includes
Further, the icon is displayed at a position indicating a direction in which the destination candidate exists.
A navigation device characterized by that. The navigation device according to claim 15, wherein
The destination candidate display means includes
Further, a display indicating the direction in which the destination candidate exists is included in the icon and displayed.
A navigation device characterized by that. A display method of a navigation device mounted on a vehicle,
The navigation device
A stray determination step for determining whether the vehicle is stray;
A destination candidate display step for selecting and displaying a destination candidate when it is determined that the vehicle is strayed by the stray determination step;
The display method characterized by performing.

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