JP2004069550A - On-vehicle navigation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily find a bypass in the search for another route (bypass) different from a guided route in the case of a traffic jam or the like without requiring any laborious operation from a user in an on-vehicle navigation device when guide display for an intersection as a turning point to the following route on the guided route. <P>SOLUTION: This on-vehicle navigation device is provided with a display means, a vehicle speed detection means, and a control means. The control means shrinks display of an enlarged view of the intersection on the display device (S4) when a traveling speed detected by the vehicle speed detection means is lowered below a predetermined speed (S3) while the enlarged view of the intersection as the turning point to the following route on the guided route of its own vehicle is displayed on a screen of the display means (S2). <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an in-vehicle navigation device, and more particularly to an in-vehicle navigation device having a function of displaying an enlarged view of an intersection to be changed next on a guidance route on a display screen, where the guidance route is congested. The present invention relates to an intersection guidance display technique adapted to make it easier to find another route (a detour) on a screen when searching for that detour.
[0002]
[Prior art]
In a conventional typical in-vehicle navigation device, a CPU that controls all processes related to navigation, a storage device such as a CD-ROM or a DVD-ROM in which map data is stored in advance, a display device, and the current position of the vehicle A GPS (Global Positioning System) receiver for detecting the vehicle, a gyro and a vehicle speed sensor for detecting the traveling direction and traveling speed of the own vehicle, etc., and map data including the current position of the own vehicle by the CPU. Is read from the storage device, a map image around the own vehicle position is drawn on the display screen based on the map data, and the own vehicle position mark indicating the current position of the own vehicle is superimposed and displayed on the display screen, Scroll the map image according to the movement of the vehicle, or fix the map image on the screen and And or to move the location mark, so that can be seen whether the vehicle is running on a where the current at a glance.
[0003]
In addition, the in-vehicle navigation device is usually provided with a function (route guidance function) for guiding a user to easily travel on a road to a destination without making a mistake. According to the route guidance function, the CPU calculates the optimal route from the starting point (typically, the current position of the vehicle) to the destination using the map data by simulation such as a horizontal search method or a Dijkstra method. Is performed, and the searched route is stored as a guide route, and the guide route can be distinguished from other roads on the map image during traveling (for example, by changing the color or increasing the line width). Display), and when the vehicle approaches the intersection to change course on the guidance route within a predetermined distance, an enlarged view of the intersection is displayed on the map image, so that the destination can be displayed. The user can grasp the optimal route for the route.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional on-vehicle navigation device, while the own vehicle is traveling according to the searched guidance route (during route guidance), a predetermined distance (for example, the When approaching (300 m before the intersection), an enlarged view of the intersection is displayed on the display screen. Such an enlarged guidance display of an intersection is a very convenient function in a normal case (when the vehicle passes through the intersection along a guidance route) because it is large and easy for a user (particularly a driver) to see.
[0005]
However, in some cases, the large intersection guidance display may become an obstacle. For example, if you try to make a turn at the intersection according to the guidance route, but want to go to another route (detour) because the guidance route is congested, the detour is displayed on the screen before reaching the intersection. However, since the intersection is enlarged and displayed on the screen, the display range of the map image is reduced accordingly, making it difficult to find a detour. That is, when trying to find another route (a detour) on the screen during a traffic jam, there is an inconvenience that a large intersection guidance display is rather obstructive.
[0006]
In such a case, in the related art, the user has performed an operation of deleting the large intersection guidance display from the screen.
[0007]
However, such an operation is troublesome for the user (particularly a driver), and furthermore, after erasing the enlarged display screen of the intersection, it is necessary to search for a detour on the screen before reaching the intersection. May hinder safe driving.
[0008]
The present invention has been created in view of the problems in the related art, and does not require troublesome operation for a user in performing a guidance display of an intersection to be changed next on a guidance route without causing a traffic jam or the like. It is an object of the present invention to provide an in-vehicle navigation device that allows a user to easily find a different route (a detour) different from a guidance route on a screen when searching for the detour.
[0009]
[Means for Solving the Problems]
According to an embodiment of the present invention, there is provided a display unit for providing guidance information, a vehicle speed detection unit for detecting a traveling speed of a vehicle, and a display unit and a vehicle speed detection unit. Operably connected control means for displaying, on the screen of the display means, an enlarged view of an intersection to be changed next on the guidance route to which the vehicle is guided. In the state, when it is detected that the traveling speed detected by the vehicle speed detecting means has decreased to a predetermined speed or less, an enlarged view of the intersection is reduced and displayed on the display means. An apparatus is provided.
[0010]
According to the in-vehicle navigation device according to this aspect, the traveling speed of the own vehicle is equal to or less than the predetermined speed while the enlarged view of the intersection to be changed next on the guidance route is displayed on the screen of the display means. , The enlarged view of the intersection is reduced and displayed on the screen. Therefore, another route (a detour) different from the guidance route due to traffic congestion or the like is displayed on the screen without the need for a troublesome operation (operation for removing a large intersection guidance display from the screen) as in the related art. When searching for, the guide display of the intersection does not become an obstacle, so that the detour can be easily found.
[0011]
According to another aspect of the present invention, a display unit for providing guidance information, a vehicle speed detection unit for detecting a traveling speed of the own vehicle, and a control unit operably connected to the display unit and the vehicle speed detection unit The control unit is configured to control the vehicle speed detection unit to display an enlarged view of an intersection to be changed next on the guidance route on which the vehicle is guided on the screen of the display unit. An on-vehicle navigation device is provided, in which when the stop state is detected based on the detected traveling speed, an enlarged view of the intersection is reduced and displayed on the display means.
[0012]
Also in the on-vehicle navigation device according to this embodiment, in a state where an enlarged view of an intersection to be changed next on the guidance route is displayed on the screen of the display means, the stop state is determined based on the traveling speed of the own vehicle. When the detection is detected, the enlarged view of the intersection is reduced and displayed on the screen, so that the same effect as in the vehicle-mounted navigation device according to the above embodiment can be obtained.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0014]
FIG. 1 schematically shows a configuration of an on-vehicle navigation device according to an embodiment of the present invention.
[0015]
In the illustrated on-vehicle navigation device 30, reference numeral 1 denotes a CD-ROM drive, and a CD-ROM 1 a driven by the CD-ROM drive 1 has a scale level (1 / 12,500, 1/25000, 1/50000, etc.). , Map data divided into longitude and latitude widths of appropriate sizes in advance are stored in advance. The map data includes road data for display, road data for route search, data on the position and size of various properties (convenience stores, gas stations, banks, fast food stores, etc.) serving as intersections and landmarks. Each data is represented by a coordinate set of points (nodes) expressed in longitude and latitude. Reference numeral 2 denotes an operation unit for operating a navigation device body 10 described later, and has, for example, a form of a remote control transmitter. Although not specifically shown, the remote control transmitter is appropriately provided with various operation buttons, a joystick, and the like for selecting various menus, various items, and the like on the display screen and executing the selected menu and the like.
[0016]
Reference numeral 3 denotes a communication device such as an in-vehicle telephone for communicating with various service centers. Reference numeral 4 denotes a VICS receiver for receiving VICS (road traffic information communication system) information transmitted from a radio beacon or an optical beacon. A GPS receiver 6 receives a GPS signal sent from a GPS satellite and detects the longitude and latitude of the current position of the vehicle. Reference numeral 6 denotes a self-contained navigation sensor. The self-contained navigation sensor 6 includes an angle sensor 6a such as a gyro for detecting the traveling direction of the own vehicle and a distance sensor 6b that generates a pulse for each fixed traveling distance. Used to detect.
[0017]
Reference numeral 7 denotes a display device such as an LCD, and reference numeral 8 denotes a speaker. The display device 7 provides navigation information (a map around the current position of the vehicle, a guide route from the departure point to the destination, a current position of the vehicle ( The vehicle position mark), other guidance information, etc.) are provided to the user (particularly the driver) on the screen, and information on the enlargement / reduction display processing of the intersection performed by the vehicle-mounted navigation device 30 is displayed on the screen as described later. To be displayed. The speaker 8 provides guidance information on the above navigation to the user by voice.
[0018]
In the navigation apparatus main body 10, reference numeral 11 denotes a map data reading control unit for reading map data from the CD-ROM 1a via the CD-ROM drive 1, and reference numeral 12 temporarily stores the map data read by the map data reading control unit 11. , Buffer memories 13, 14, 15, 16, and 17 respectively serve as interfaces (I / F) connected to the operation unit 2, the communication device 3, the VICS receiver 4, the GPS receiver 5, and the self-contained navigation sensor 6. Show. Reference numeral 18 denotes a control unit constituted by a microcomputer or the like, and the control unit 18 stores a navigation program (a program for performing a route search process and a display output control necessary for route guidance based on the route search process). In accordance with this program, the current position of the own vehicle is detected based on a signal output from the GPS receiver 5, and the running speed (vehicle speed) of the own vehicle is detected based on a signal output from the self-contained navigation sensor 6. ) Or by controlling the map data reading control unit 11 to read out the map data to be displayed from the CD-ROM 1a to the buffer memory 12 via the CD-ROM drive 1 or read out the map data to the buffer memory 12. Navigation, such as searching for a guidance route from the starting point (the current position of the vehicle) to the destination using the search conditions set using the map data It executes various processes according to Shon. Further, the control unit 18 has a function of controlling a process related to the enlargement / reduction display of the intersection performed by the on-vehicle navigation device 30 as described later.
[0019]
Reference numeral 19 denotes a map drawing unit that performs a map image drawing process using the map data read into the buffer memory 12, and 20 denotes various menu screens (operation screens), own vehicle position marks, cursors, and the like according to operation conditions. An operation screen / mark generation unit 21 for generating various marks is a guidance route storage unit for storing data relating to the guidance route. The guidance route storage unit 21 stores data on all nodes (coordinates of points expressed in latitude and longitude) from the departure point to the destination of the guidance route searched by the control unit 18. Reference numeral 22 denotes a guidance route drawing unit which reads guidance route data (node sequence) from the guidance route storage unit 21 and displays the guidance route in a different display mode (color is changed and line width is thicker than other roads). , Etc.).
[0020]
Reference numeral 23 denotes an image synthesizing unit. The map image drawn by the map drawing unit 19 includes a guide route drawn by the guide route drawing unit 22, an operation screen generated by the operation screen / mark generation unit 20, and various marks. And a function of superimposing them on the screen of the display device 7. The image synthesizing unit 23 also has a function of displaying, on the screen of the display device 7, information related to the intersection enlargement / reduction display processing performed by the vehicle-mounted navigation device 30 based on the control from the control unit 18, as described later. Have. Reference numeral 24 denotes an audio output unit, which outputs an audio signal (guidance information relating to navigation) to the speaker 8 based on control from the control unit 18.
[0021]
In the in-vehicle navigation device 30 configured as described above, the CD-ROM 1a is a “memory device”, the self-contained navigation sensor 6 is a “vehicle speed detecting device”, the display device 7 is a “display device”, and the control unit 18 is a Each corresponds to “control means”.
[0022]
The on-vehicle navigation device 30 according to the present embodiment displays an enlarged view of an intersection to be changed next on the guidance route on which the vehicle is guided on the screen of the display device 7 as described later. When a predetermined condition is satisfied in a state where the vehicle is running (for example, when the traveling speed of the own vehicle is reduced to a predetermined speed or less, or when a predetermined time has elapsed after the own vehicle stopped), the display device 7 is displayed. On the other hand, an enlarged view of the intersection is reduced and displayed on the screen.
[0023]
FIGS. 2 to 4 show screen display examples of guidance information displayed on the screen of the display device 7 via the image synthesizing unit 23 under the control of the control unit 18 in the vehicle-mounted navigation device 30 according to the present embodiment. It is shown.
[0024]
FIG. 2 shows an example of a screen display during route guidance (during route guidance). In the illustrated example, the map image 41 displayed on the display screen 40 includes a vehicle position mark CM indicating the current position of the vehicle, and a guidance route from the vehicle position (CM) to the destination, that is, the main navigation. An example of a case where the guidance route GR searched by the device is displayed is shown. In this case, the guidance route GR is displayed in a display mode different from that of other roads (for example, a line width is widened or displayed in a conspicuous color) so that the user can easily identify the guidance route GR.
[0025]
In the example of the screen display shown in FIG. 2, the destination, which is the end point of the guidance route GR, is not displayed on the screen for the following reason. To display the entire route of the guidance route GR from the vehicle position (CM) to the destination on the same screen, it is generally necessary to considerably reduce the display scale of the screen, although it depends on the distance to the destination. Yes, in this case, the screen becomes difficult to see. Therefore, the display scale of the screen is adjusted to a display scale at which the guidance route GR around the own vehicle can be grasped at least by the user's setting operation (that is, the screen display is enlarged). FIG. 2 shows a screen display example when the display scale is adjusted.
[0026]
FIG. 3 shows an example of a screen display when an enlarged view of an intersection is displayed. In the illustrated example, when the vehicle (CM) on the guidance route GR reaches a predetermined distance (for example, 300 m) to an intersection at which the course should be changed, the image combining unit 23 is controlled based on the control by the control unit 18. , The display screen 40 of the display device 7 is divided into a left screen L and a right screen R, and the display contents before the screen division (including the intersection along with the guidance route GR and the own vehicle position mark CM) are divided into the left screen L. Is shown, an example of a case where an enlarged view of the intersection is displayed on the map image 41a on the right screen R is shown. At the time of the enlarged display of the intersection, as shown in the figure, a mark (a convenience store, a gas station, etc.) near the intersection is provided so that the driver can easily grasp the situation of the intersection and its surroundings. , Fast food restaurants, etc.) are also displayed at the same time.
[0027]
FIG. 4 shows an example of a screen display related to a reduced display of an enlarged view of an intersection characterizing the present invention. In the illustrated example, as shown in FIG. 3, in a state where the enlarged view of the intersection is displayed on one of the divided screens of the display screen 40, the traveling speed of the own vehicle is equal to or less than a predetermined speed (for example, 5 km / h). When a predetermined time (for example, 2 to 3 seconds) has elapsed after the vehicle has stopped, the display device 7 is transmitted to the display device 7 via the image combining unit 23 based on the control from the control unit 18. An example (map image 41b) is shown in which a screen displaying the enlarged view of the intersection (right screen R in FIG. 3) is reduced and displayed in the lower right corner of the display screen 40. The scale of the display when the enlarged view of the intersection is displayed in a reduced scale is selected to be large enough to allow the driver to recognize the intersection and the surrounding area when the vehicle is traveling at a low speed below a predetermined speed or when the vehicle is stopped.
[0028]
Hereinafter, the process related to the enlargement / reduction display of the intersection performed by the vehicle-mounted navigation device 30 according to the present embodiment will be described with reference to FIG. 5 illustrating an example of the process flow.
[0029]
First, it is assumed that, in the initial state, the own vehicle is guided along the route to the destination. The process for performing this route guidance is not particularly shown because it is not related to the gist of the present invention, but is typically performed as follows.
[0030]
That is, the user (for example, a driver) operates the operation unit 2 (remote control transmitter) to set the destination and other necessary information (such as a passing point on the way to the destination, a shorter traveling distance, or a shorter traveling time). Is set in the control unit 18, the input destination data and the departure point data set as the departure point using the current position of the vehicle detected by the GPS receiver 5 are set. Based on the above, map data in a range from the departure place to the destination is read from the CD-ROM 1a to the buffer memory 12, and further, the data from the departure place to the destination is referred to by referring to the data stored in the guidance route storage unit 21. Is searched for the optimal guide route connecting by using a horizontal search method or the like. The searched route is displayed on the display screen 40 of the display device 7 via the image synthesizing unit 23 based on the control of the control unit 18 together with the own vehicle position mark CM as shown in the screen display example of FIG. 41 is superimposed and displayed. At this time, the guide route GR is displayed in a display mode that is relatively conspicuous so that the user can easily identify the guide route GR. Thereby, the user can grasp the guidance route GR through which the vehicle should be guided to the destination through the display screen 40 of the display device 7.
[0031]
In a state where the own vehicle is guided along the guidance route GR in this way, in the first step S1, the control unit 18 determines that the own vehicle is on the guidance route GR until a predetermined intersection is to be changed. It is determined whether the distance (300 m) has been reached (YES) or not (NO). If the determination is YES, the process proceeds to step S2, and if the determination is NO, the determination process is repeated. This determination process refers to the map data (including the guidance route GR) read out to the buffer memory 12, and the traveling speed (vehicle speed) of the own vehicle calculated from the output signal (vehicle speed pulse) of the self-contained navigation sensor 6 (distance sensor 6b). ).
[0032]
In the next step S2, as shown in the screen display example of FIG. 3, the display device 7 divides the display screen 40 into two left and right screens via the image synthesizing section 23 based on the control from the control section 18, An enlarged view of the intersection is displayed on one screen (right screen R). On the other divided screen (left screen L), the display contents before the screen division (including the intersection along with the guidance route GR and the own vehicle position mark CM) are left.
[0033]
In the next step S3, the control unit 18 determines whether or not the traveling speed (V) of the vehicle has decreased to a predetermined speed (Va), for example, 5 km / h or less (YES) or not (NO). This determination is made based on the output signal (vehicle speed pulse) of the self-contained navigation sensor 6 (distance sensor 6b). When the determination result is YES, the process proceeds to step S4, and when the determination result is NO, the process jumps to step S6.
[0034]
In step S4 (V ≦ Va, that is, when the vehicle is traveling at a low speed below a predetermined speed), the display is performed via the image synthesizing unit 23 based on the control from the control unit 18 as shown in the example of the screen display in FIG. The device 7 reduces and displays the screen (the right screen R in FIG. 3) displaying the enlarged view of the intersection at the lower right corner of the display screen 40.
[0035]
In this case, in the screen display example of FIG. 4, the reduced view of the enlarged view of the intersection is displayed in the lower right corner of the display screen 40, but the place where the reduced view of the enlarged view of the intersection is displayed is not limited to this. It is. The point is that if it is a place that does not visually interfere with searching for another route (detour) different from the guidance route on the screen at the intersection, the lower left corner, the upper right corner, or the upper left corner of the display screen 40 It may be displayed in a corner.
[0036]
In the next step S5, the control unit 18 determines whether or not the traveling speed (V) of the vehicle has exceeded a predetermined speed (Va = 5km / h) (YES) or not (NO). This determination is similarly made based on the output signal (vehicle speed pulse) of the self-contained navigation sensor 6 (distance sensor 6b). Then, if the result of the determination is YES, the process returns to step S2 to repeat the above processing, and if the result of the determination is NO, the process proceeds to step S6.
[0037]
In step S6, the control unit 18 determines whether or not the vehicle has reached the intersection on the guidance route GR (YES) or not (NO). If the determination is YES, the process proceeds to step S7, and if the determination is NO, the determination process is repeated. This determination processing refers to the map data (including the guidance route GR) read out to the buffer memory 12 and outputs the output signal (vehicle speed pulse) of the self-contained navigation sensor 6 (distance sensor 6b) in the same manner as the processing performed in step S1. ) Is calculated on the basis of the traveling speed (vehicle speed) of the own vehicle calculated from the above.
[0038]
In the next step S7, the display device 7 releases the enlarged display of the intersection via the image synthesizing unit 23 based on the control from the control unit 18. That is, the display of the enlarged view of the intersection (FIG. 3) or the reduced display of the enlarged view of the intersection (FIG. 4) is eliminated from the screen of the display device 7, and the original one-screen display (FIG. 2) is obtained.
[0039]
In the next step S8, the control unit 18 determines whether or not the traveling direction at the intersection is along the initial guidance route GR (YES) or not (NO). When the result of the determination is YES, this processing flow is "end", and when the result of the determination is NO, the flow proceeds to step S9.
[0040]
In step S9 (when a different route (a detour) different from the guidance route GR is selected and traveled at the intersection), a route search around the current position of the own vehicle, that is, a so-called “reroute search” is performed. That is, based on the data of the current position of the vehicle detected by the GPS receiver 5 and the data of the original guidance route GR, the control unit 18 optimally returns to the guidance route GR from the current position of the vehicle. For example, the shortest route from the nearest intersection in the traveling direction of the vehicle to the guidance route GR is searched. The searched route (return route) is displayed together with the guide route GR on the display screen 40 of the display device 7 via the image synthesizing unit 23 based on the control from the control unit 18 as shown in the screen display example of FIG. Is done. Then, this processing flow is “end”.
[0041]
As described above, according to the on-vehicle navigation device 30 according to the present embodiment, an enlarged view of an intersection to be changed next on the guidance route on which the vehicle is guided is displayed on the screen of the display device 7. In this state (FIG. 3, step S2), when the traveling speed (V) of the own vehicle decreases to a predetermined speed (Va = 5 km / h) or less (step S3, YES), on the screen, The enlarged view of the intersection is reduced and displayed (FIG. 4, step S4).
[0042]
As a result, the guide route is congested and another route (a detour) is displayed on the screen without the need for a troublesome operation (an operation for removing a large intersection guidance display from the screen) as in the related art. When searching for, the guide display of the intersection does not become an obstacle, so that the detour can be easily found.
[0043]
Even if the enlarged view of the intersection is reduced on the screen, since the vehicle is traveling at a low speed at a predetermined speed (5 km / h) or less, the driving at the intersection and its surroundings are not hindered by safe driving. Can be fully recognized.
[0044]
In the above-described embodiment, the enlarged view of the intersection is reduced and displayed when the traveling speed of the own vehicle falls below a predetermined speed while the enlarged view of the intersection is displayed on the screen of the display device 7. Although the case has been described as an example, it goes without saying that the conditions for reducing and displaying the enlarged view of the intersection are not limited to this. For example, there is a case where it is necessary to temporarily stop before the intersection due to traffic congestion or the like, and in such a case, an enlarged view of the intersection is reduced and displayed when a state where the vehicle is completely stopped is detected. You may. FIG. 6 shows an example of the processing flow in that case.
[0045]
Referring to FIG. 6, in the first step S11, in a manner similar to the processing performed in step S1 of FIG. 5, the control unit 18 determines that the own vehicle on the guidance route GR has a predetermined distance to an intersection at which the course should be changed next. It is determined whether the distance (300 m) has been reached (YES) or not (NO). If the determination result is YES, the process proceeds to step S12, and if the determination result is NO, the determination process is repeated.
[0046]
In the next step S12, the display device 7 divides the display screen 40 into two right and left screens via the image synthesizing section 23 based on the control from the control section 18 in the same manner as the processing performed in step S2 in FIG. Then, an enlarged view of the intersection is displayed on one screen (FIG. 3).
[0047]
In the next step S13, the control unit 18 determines whether or not the own vehicle has stopped and a predetermined time, for example, two to three seconds has elapsed (YES) or not (NO). The determination as to whether or not the vehicle has stopped can be made based on the output signal (vehicle speed pulse) of the self-contained navigation sensor 6 (distance sensor 6b) in the same manner as the process performed in step S3 in FIG. When the determination result is YES, the process proceeds to step S14, and when the determination result is NO, the process jumps to step S17.
[0048]
In step S14, in the same manner as the process performed in step S4 of FIG. 5, the display device 7 displays a screen displaying an enlarged view of the intersection based on the control of the control unit 18 via the image combining unit 23. The display is reduced (FIG. 4).
[0049]
In the next step S15, the control unit 18 detects that the own vehicle has started moving (departure) based on the output signal (vehicle speed pulse) of the self-contained navigation sensor 6 (distance sensor 6b).
[0050]
In the next step S16, an enlarged view of the intersection is displayed on the screen of the display device 7 in the same manner as the processing performed in step S12.
[0051]
In the next step S17, similarly to the processing performed in step S6 in FIG. 5, the control unit 18 determines whether or not the vehicle has reached the intersection on the guidance route GR (YES) or not (NO). If the determination result is YES, the process proceeds to step S18, and if the determination result is NO, the determination process is repeated.
[0052]
In the next step S18, the display device 7 releases the enlarged display of the intersection via the image synthesizing unit 23 based on the control from the control unit 18 in the same manner as the process performed in step S7 in FIG.
[0053]
In the next step S19, similarly to the processing performed in step S8 of FIG. 5, the control unit 18 determines whether the traveling direction at the intersection is along the initial guidance route GR (YES) (NO). ), The processing flow is “end” when the determination result is YES, and proceeds to step S20 when the determination result is NO.
[0054]
In the last step S20, a reroute search is performed in the same manner as the processing performed in step S9 of FIG. Then, this processing flow is “end”.
[0055]
According to the processing flow shown in FIG. 6, similar to the processing flow shown in FIG. 5, the enlarged view of the intersection to be changed next on the guidance route to which the vehicle is guided is displayed on the display device 7. In a state where the information is displayed on the screen (FIG. 3, step S12), when the vehicle stops and a predetermined time (2 to 3 seconds) elapses (step S13, YES), the corresponding screen is displayed on the screen. The enlarged view of the intersection is reduced and displayed (FIG. 4, step S14). Thereby, the same effect as in the case of the above embodiment (the processing flow shown in FIG. 5) can be obtained.
[0056]
In the processing flow shown in FIG. 6, when the stop state is detected once (step S13), the enlarged view of the intersection is reduced and displayed (step S14). However, the intersection may be reduced depending on the situation such as traffic congestion. In some cases, it is necessary to stop the vehicle many times before the vehicle stops. In such a case, when the stopped state is detected a plurality of times (for example, twice), the enlarged view of the intersection may be reduced and displayed. Good. In this case, a process is added between step S13 and step S14 to determine whether the number of times of detection of the stopped state has reached a predetermined number (for example, two).
[0057]
【The invention's effect】
As described above, according to the in-vehicle navigation device according to the present invention, when a predetermined condition is satisfied while an enlarged view of an intersection to be changed next on the guidance route is displayed on the display screen. By displaying an enlarged view of the intersection at a reduced scale, the user can easily find a different route (a detour) on the screen when searching for another route (a detour) different from the guidance route due to traffic congestion, etc., without requiring any troublesome operation for the user. It is possible to find out.
[Brief description of the drawings]
FIG. 1 is a block diagram schematically showing a configuration of a vehicle-mounted navigation device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of a screen display during route guidance.
FIG. 3 is a diagram showing an example of a screen display when an enlarged view of an intersection is displayed.
FIG. 4 is a diagram illustrating an example of a screen display when an enlarged view of an intersection is reduced and displayed.
FIG. 5 is a flowchart illustrating an example of a process related to an enlarged / reduced display of an intersection performed by the on-vehicle navigation device in FIG. 1;
FIG. 6 is a flowchart showing another example of the processing related to the enlarged / reduced display of the intersection performed by the on-vehicle navigation device in FIG. 1;
[Explanation of symbols]
1a: CD-ROM (memory means),
2 ... operation part,
4 ... GPS receiver,
6 ... self-contained navigation sensor (vehicle speed detecting means),
7. Display device (display means)
10. Navigation device body,
18 ... control unit (control means),
19: Map drawing unit,
20 ... operation screen / mark generation unit
21: guidance route storage unit,
22 ... guidance route drawing unit
23 ... Image synthesis unit
30 ... car navigation system,
40 (L, R) ... display screen,
41, 41a, 41b ... map image,
CM: vehicle position mark,
GR: guidance route,
A to C: Icons indicating each property.

Claims (7)

Display means for providing guidance information;
Vehicle speed detecting means for detecting the traveling speed of the vehicle;
Control means operably connected to the display means and the vehicle speed detection means,
The control unit is configured to display an enlarged view of an intersection to be changed next on the guidance route to which the vehicle is guided on the screen of the display unit, and to detect the travel detected by the vehicle speed detection unit. An in-vehicle navigation device, characterized in that when detecting that the speed has dropped below a predetermined speed, an enlarged view of the intersection is reduced and displayed on the display means. The control means, when detecting that the traveling speed detected by the vehicle speed detection means has exceeded the predetermined speed before the own vehicle reaches the intersection, displays the reduced-sized intersection on the display means. The in-vehicle navigation device according to claim 1, wherein the enlarged view of (1) is displayed in a size before being reduced and displayed. Display means for providing guidance information;
Vehicle speed detecting means for detecting the traveling speed of the vehicle;
Control means operably connected to the display means and the vehicle speed detection means,
The control unit is configured to display an enlarged view of an intersection to be changed next on the guidance route to which the vehicle is guided on the screen of the display unit, and to detect the travel detected by the vehicle speed detection unit. An on-vehicle navigation device characterized in that when a stop state is detected based on a speed, an enlarged view of the intersection is reduced and displayed on the display means. The control means, when detecting that the stop state has continued for a predetermined time before the vehicle reaches the intersection, causes the display means to reduce and display an enlarged view of the intersection. Item 4. An in-vehicle navigation device according to item 3. 4. The control unit according to claim 3, wherein the control unit causes the display unit to reduce and display an enlarged view of the intersection when the stopped state is detected a plurality of times before the vehicle reaches the intersection. In-vehicle navigation device. The control means, when detecting that the stopped state is released before the vehicle reaches the intersection, displays the enlarged view of the reduced-size intersection on the display means before the display is reduced. The in-vehicle navigation device according to claim 3, wherein the navigation device is displayed at the same time. Further comprising a memory means for storing map data,
The control means determines whether or not the own vehicle has reached a predetermined distance to the intersection based on the map data stored in the memory means and the traveling speed detected by the vehicle speed detection means, The in-vehicle navigation device according to any one of claims 1 to 6, wherein an enlarged view of the intersection is displayed on the screen of the display means when the distance of the intersection has been reached.

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