JP4064175B2 - Car navigation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle navigation device, and in particular, in an in-vehicle navigation device having a function of displaying on a display screen an enlarged view of an intersection whose route should be changed next on a guidance route, the guidance route is congested. The present invention relates to an intersection guidance display technique adapted to facilitate searching for another route (an alternative route) on the screen.
[0002]
[Prior art]
In a conventional typical vehicle-mounted navigation device, a CPU that controls all processing related to navigation, a storage device such as a CD-ROM or DVD-ROM that stores map data in advance, a display device, and the current position of the vehicle A GPS (Global Positioning System) receiver for detecting the vehicle, a gyro for detecting the traveling direction and traveling speed of the own vehicle, a vehicle speed sensor, etc., and map data including the current position of the own vehicle by the CPU From the storage device, and based on this map data, draw a map image around the vehicle position on the display screen, and display a vehicle position mark indicating the current position of the vehicle superimposed on the display screen, Scroll the map image according to the movement of the vehicle, or fix the map image on the screen and move the vehicle position mark, The car is in can be seen at a glance whether running the where current.
[0003]
In-vehicle navigation devices are usually equipped with a function (route guidance function) that guides a user so that the user can easily travel on the road without making a mistake. According to this route guidance function, the CPU calculates the optimal route from the departure point (typically the current position of the vehicle) to the destination using map data, such as a horizontal search method or a Dijkstra method. The route searched is stored as a guide route, and the route can be distinguished from other roads on the map image while traveling (for example, the color is changed or the line width is increased). And when the vehicle approaches within a predetermined distance to the intersection whose course is to be changed on the guidance route, an enlarged view of the intersection is displayed on the map image. The user can grasp the optimum route for the user.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional vehicle-mounted navigation device, while the vehicle is traveling according to the searched guidance route (during route guidance), within a predetermined distance (for example, the intersection) When approaching 300m before the intersection), an enlarged view of the intersection is displayed on the screen of the display. Such an enlarged guidance display of an intersection is a very convenient function because it is large and easy to see for a user (especially a driver) in a normal case (when passing the intersection according to a guidance route).
[0005]
However, in some cases, the large intersection guidance display may be an obstacle. For example, if you try to bend the intersection according to the guidance route, but the guidance route is congested and you want to go to another route (detour), the detour is displayed on the screen before you reach the intersection. However, since the intersection is enlarged and displayed on the screen, the display range of the map image is reduced accordingly and it is difficult to search for a detour. In other words, when trying to find another route (detour) on the screen at the time of traffic jam, there is a disadvantage that the large intersection guidance display is disturbed.
[0006]
In such a case, in the conventional technique, 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 (especially a driver), and it is necessary to find a detour on the screen before reaching the intersection after the enlarged display screen of the intersection is turned off. May interfere with safe driving.
[0008]
The present invention was created in view of the problems in the prior art, and does not require troublesome operations for the user when performing a guidance display of an intersection whose course should be changed next on the guidance route. It is an object of the present invention to provide an in-vehicle navigation device that can easily find a detour when a different route (detour) different from the guide route is searched for on the screen.
[0009]
[Means for Solving the Problems]
  In order to solve the above-described problems of the prior art, the present inventionAccording toDisplay means for providing guidance information, vehicle speed detection means for detecting the traveling speed of the host vehicle, and control means operably connected to the display means and the vehicle speed detection means. In the state where an enlarged view of the intersection where the course should be changed next is displayed on the screen of the display means on the guidance route on which the vehicle is guided, the stop state is determined based on the traveling speed detected by the vehicle speed detecting means. When detected, the display means, In one of the four corners of the screen,An in-vehicle navigation device is provided, wherein an enlarged view of the intersection is reduced and displayed.
[0010]
  The present inventionAccording to the in-vehicle navigation device according to the present invention, the traveling speed of the host vehicle is displayed in a state where an enlarged view of the next intersection to be changed on the guidance route is displayed on the screen of the display means.When a stop condition is detected based on, at any one of the four corners of the screen (lower right, lower left, upper right, upper left corner)An enlarged view of the intersection is reduced and displayed. Therefore, a different route (detour) different from the guidance route due to traffic jams or the like is displayed on the screen without requiring a troublesome operation (an operation to erase a large intersection guidance display from the screen) as seen in the prior art. When searching inThe guide display of the intersection is reduced in a place (corner of the screen) that is not visually disturbing on the screen.Therefore, the detour can be easily found.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0014]
FIG. 1 schematically shows the configuration of an in-vehicle navigation device according to an embodiment of the present invention.
[0015]
In the illustrated in-vehicle navigation device 30, reference numeral 1 denotes a CD-ROM drive. The CD-ROM 1 a driven by the CD-ROM drive 1 has a scale level (1/12500, 1/25000, 1 / 50,000, etc.). The map data divided into the longitude width and the latitude width of an appropriate size is stored in advance. This map data includes road data for display, road data for route search, data on the location and size of various properties (convenience stores, gas stations, banks, fast food stores, etc.) that serve as intersections and landmarks. Each data is represented by a coordinate set of points (nodes) expressed by longitude and latitude. Reference numeral 2 denotes an operation unit for operating a navigation apparatus body 10 to be described later, and has, for example, a form of a remote control transmitter. Although not particularly illustrated, such a remote control transmitter is appropriately provided with various operation buttons and a joystick for selecting various menus and various items on the display screen and executing the selected menus.
[0016]
Also, 3 is a communication device such as an in-vehicle telephone for communicating with various service centers, 4 is a VICS receiver for receiving VICS (road traffic information communication system) information transmitted from a radio wave 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 own vehicle. Reference numeral 6 denotes a self-contained navigation sensor. The self-contained navigation sensor 6 is composed of 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 every predetermined traveling distance, and determines the traveling speed of the own vehicle. Used to detect.
[0017]
Reference numeral 7 denotes a display device such as an LCD, and 8 denotes a speaker. The display device 7 is based on control from the navigation device body 10 to be described later, and provides navigation-related guidance information (a map around the current position of the vehicle, a guide route from the departure point to the destination, the current position of the vehicle ( The vehicle position mark), other guidance information, etc.) are provided on the screen to the user (especially the driver), and information on the intersection enlargement / reduction display processing performed by the in-vehicle navigation device 30 is displayed on the screen as will be described later. To display. The speaker 8 provides guidance information related to the above navigation to the user by voice.
[0018]
In the navigation apparatus main body 10, 11 is a map data reading control unit for reading map data from the CD-ROM 1 a via the CD-ROM drive 1, and 12 is temporary map data read by the map data reading control unit 11. , 13, 14, 15, 16 and 17 are interfaces (I / F) connected to the operation unit 2, the communication device 3, the VICS receiver 4, the GPS receiver 5, and the autonomous navigation sensor 6, respectively. Show. Reference numeral 18 denotes a control unit constituted by a microcomputer or the like. The control unit 18 is a navigation program (a program for performing display output control necessary for route search processing and route guidance based on the program). According to this program, the current position of the host vehicle is detected based on the signal output from the GPS receiver 5, and the traveling speed (vehicle speed) of the host vehicle is determined based on the signal output from the autonomous navigation sensor 6. ) Or by controlling the map data reading control unit 11 to read the map data to be displayed from the CD-ROM 1a to the buffer memory 12 via the CD-ROM drive 1, or to the buffer memory 12. Navigation such as searching for a guidance route from the departure point (the current position of the vehicle) to the destination under the search conditions set using the map data. It executes various processes according to Shon. Moreover, the control part 18 has a function which controls the process which concerns on the expansion / reduction | reduction display of the intersection which the vehicle-mounted navigation apparatus 30 performs as mentioned later.
[0019]
Reference numeral 19 denotes a map drawing unit that performs drawing processing of a map image using the map data read to the buffer memory 12, and 20 denotes various menu screens (operation screens), a vehicle position mark, a cursor, and the like according to the operation status. An operation screen / mark generation unit 21 for generating various marks is shown, and a guide route storage unit 21 for storing data related to the guide route. The guidance route storage unit 21 stores data regarding all nodes (coordinates of points expressed in longitude and latitude) 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 display mode (color is changed, line width is different) from other roads. And so on).
[0020]
Reference numeral 23 denotes an image composition unit. The map image drawn by the map drawing unit 19 is guided to the guide route drawn by the guide route drawing unit 22, the operation screen generated by the operation screen / mark generation unit 20, and various marks. Etc. are superimposed and displayed on the screen of the display device 7. As will be described later, the image composition unit 23 also has a function of displaying information related to the intersection enlargement / reduction display processing performed by the vehicle-mounted navigation device 30 on the screen of the display device 7 based on the control from the control unit 18. Have. Reference numeral 24 denotes an audio output unit which outputs an audio signal (guidance information related 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 unit”, the self-contained navigation sensor 6 is a “vehicle speed detection unit”, the display device 7 is a “display unit”, and the control unit 18 is Each corresponds to “control means”.
[0022]
As will be described later, the vehicle-mounted navigation device 30 according to the present embodiment displays an enlarged view of an intersection at which the course should be changed next on the guidance route on which the vehicle is guided on the screen of the display device 7. In a state where a predetermined condition is satisfied (for example, when the traveling speed of the own vehicle drops below a predetermined speed, when the own vehicle stops and a predetermined time elapses) On the other hand, the enlarged view of the intersection is reduced and displayed on the screen.
[0023]
2 to 4 are screen display examples of guidance information displayed on the screen of the display device 7 via the image composition unit 23 based on control from the control unit 18 in the in-vehicle navigation device 30 according to the present embodiment. It is shown.
[0024]
FIG. 2 shows an example of a screen display when route guidance is being performed (during route guidance). In the illustrated example, the map image 41 displayed on the display screen 40, along with the vehicle position mark CM indicating the current position of the vehicle, a guide route from the vehicle position (CM) to the destination, that is, the main navigation. An example in which the guide route GR searched for by the device is displayed is shown. In this case, the guide route GR is displayed in a display mode different from other roads (for example, the line width is increased or the color is displayed in a conspicuous color) so that the user can easily identify the route.
[0025]
In the screen display example shown in FIG. 2, the destination that is the end point of the guidance route GR is not displayed on the screen. This is due to the following reason. When trying 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 ratio of the screen, depending on the distance to the destination. Yes, in this case the screen becomes difficult to see. Thus, the user's setting operation adjusts the display scale of the screen to a display scale that can grasp at least the guidance route GR around the host vehicle (that is, enlarges the screen display). 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 example shown in the figure, when the host vehicle (CM) reaches a predetermined distance (for example, 300 m) on the guidance route GR to the next intersection where the route should be changed, the image composition unit 23 is controlled based on the control from 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 content before the screen division is included in the left screen L (including the intersection along with the guide route GR and the vehicle position mark CM). Is shown, and 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. In the enlarged display of this intersection, in order to make it easy for the driver to grasp the situation of the intersection and its surroundings, as shown in the figure, a property (convenience store, gas station, etc.) serving as a landmark in the vicinity of the intersection. , Icons indicating the fast food restaurant 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 example shown in the figure, the traveling speed of the vehicle is not more than a predetermined speed (for example, 5 km / h) in a state where an enlarged view of the intersection is displayed on one of the divided screens of the display screen 40 as illustrated in FIG. Or when the vehicle stops and a predetermined time (for example, 2 to 3 seconds) has passed, the display device 7 is controlled via the image composition unit 23 based on the control from the control unit 18. An example (map image 41b) is shown in which a screen displaying an enlarged view of the intersection (the right screen R in FIG. 3) is reduced and displayed in the lower right corner of the display screen 40. The display scale factor when the enlarged view of the intersection is displayed in a reduced size is selected so that the driver can recognize the situation of the intersection and its surroundings when traveling at a low speed below a predetermined speed or stopping.
[0028]
Hereinafter, the process related to the enlarged / reduced display of the intersection performed by the in-vehicle navigation device 30 according to the present embodiment will be described with reference to FIG. 5 showing an example of the process flow.
[0029]
First, in the initial state, it is assumed that the route of the vehicle is directed toward the destination. The processing for performing the route guidance is not particularly illustrated because it is not related to the gist of the present invention, but is typically performed as follows.
[0030]
In other words, the user (for example, the driver) operates the operation unit 2 (remote control transmitter), and the destination and other necessary information (passing point on the way to the destination, shortening the travel distance or shortening the travel time) Information such as whether to prioritize the vehicle, etc.) is set, the control unit 18 inputs the destination data and the departure point data set with the current position of the vehicle detected by the GPS receiver 5 as the departure point. Based on the above, map data in a range from the departure point to the destination is read from the CD-ROM 1a to the buffer memory 12, and further, with reference to the data stored in the guide route storage unit 21, from the departure point to the destination The optimal guidance route connecting the two is searched by a horizontal search method or the like. As shown in the screen display example of FIG. 2, the searched guidance route is displayed on the display screen 40 of the display device 7 via the image composition unit 23 based on the control from the control unit 18 together with the vehicle position mark CM. 41 is displayed in a superimposed manner. At this time, the guide route GR is displayed in a relatively conspicuous display mode so that the user can easily identify it. Thereby, the user can grasp the guidance route GR through which the host vehicle should be guided to the destination through the display screen 40 of the display device 7.
[0031]
  In the state where the vehicle is guided along the guidance route GR in this way, in the first step S1, the control unit 18 determines a predetermined distance until the intersection on which the vehicle is to change the course on the guidance route GR. 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 S2, and if the determination result is NO, the determination process is repeated. This determination process is the map data read out to the buffer memory 12 (including the guidance route GR).While referring toSelf-contained navigation sensor 6 (distance sensor 6b)Can be performed based on a signal (vehicle speed pulse) output from the vehicle. For example, the travel speed (vehicle speed) of the host vehicle is calculated from the vehicle speed pulse acquired from the sensor 6, the travel speed is accumulated to determine the travel distance, and the current position of the host vehicle is calculated from the travel distance by inertial navigation. It is determined whether the vehicle has reached a predetermined distance from the current position to the intersection.
[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 composition unit 23 based on the control from the control unit 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 content before the screen division (including the intersection along with the guidance route GR and the vehicle position mark CM) is 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, (YES) or not (NO). This determination is performed based on the output signal (vehicle speed pulse) of the self-contained navigation sensor 6 (distance sensor 6b). If the determination result is YES, the process proceeds to step S4, and if the determination result is NO, the process jumps to step S6.
[0034]
In step S4 (V ≦ Va, that is, when traveling at a low speed below a predetermined speed), as shown in the screen display example of FIG. 4, the display is performed via the image composition unit 23 based on the control from the control unit 18. The device 7 reduces and displays the screen displaying the enlarged view of the intersection (the right screen R in FIG. 3) in the lower right corner of the display screen 40.
[0035]
In this case, in the screen display example of FIG. 4, the reduced display of the enlarged view of the intersection is performed in the lower right corner of the display screen 40, but the place where the enlarged display of the enlarged view of the intersection is reduced is not limited to this. It is. The point is that the lower left corner, the upper right corner, or the upper left corner of the display screen 40 is a place that does not interfere visually when searching for another route (detour) different from the guide route at the intersection. It may be displayed in the corner.
[0036]
In the next step S5, the control unit 18 determines whether the traveling speed (V) of the vehicle exceeds a predetermined speed (Va = 5 km / 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). If the determination result is YES, the process returns to step S2 to repeat the above process, and if the determination result is NO, the process proceeds to step S6.
[0037]
In step S6, the control unit 18 determines whether the vehicle has reached the intersection (YES) or not (NO) on the guidance route GR. If the determination result is YES, the process proceeds to step S7, and if the determination result is NO, the determination process is repeated. This determination process is similar to the process performed in step S1, referring to the map data (including the guidance route GR) read into the buffer memory 12, and the output signal (vehicle speed pulse) of the autonomous navigation sensor 6 (distance sensor 6b). ) Based on the traveling speed (vehicle speed) of the vehicle calculated from
[0038]
In the next step S <b> 7, the display device 7 cancels the enlarged display of the intersection based on the control from the control unit 18 through the image composition unit 23. 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 the traveling direction at the intersection is along the initial guidance route GR (YES) or not (NO). If the determination result is YES, the process flow is “end”, and if the determination result is NO, the process proceeds to step S9.
[0040]
In step S9 (when traveling by selecting another route (detour) different from the guidance route GR at the intersection), a route search around the current position of the vehicle, so-called “reroute search” is performed. That is, in the control unit 18, based on the data on the current position of the vehicle detected by the GPS receiver 5 and the data on the original guidance route GR, an optimal route that returns from the current position of the vehicle to the guidance route GR. For example, the shortest route from the nearest intersection to the guidance route GR in the traveling direction of the vehicle is searched. The searched route (return route) is displayed on the display screen 40 of the display device 7 through the image composition 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 vehicle-mounted navigation device 30 according to the present embodiment, an enlarged view of the next intersection to be changed on the guidance route on which the vehicle is guided is displayed on the screen of the display device 7. When the running speed (V) of the host vehicle decreases to a predetermined speed (Va = 5 km / h) or less (step S3, in the case of YES)In the lower right corner of the display screen 40 as illustrated in FIG.An enlarged view of the intersection is displayed in a reduced size(StepS4).
[0042]
  This eliminates the need for cumbersome operations as seen in the prior art (an operation to turn off the large intersection guidance display from the screen), and the guidance route is congested and another route (detour) is displayed on the screen. When searching for the intersection information displayIs visually reduced in the lower right corner of the screenSince it does not get in the way, it is possible to easily find the detour.
[0043]
Even if the enlarged view of the intersection is reduced on the screen, the vehicle is traveling at a low speed below a predetermined speed (5 km / h), so the situation of the intersection and its surroundings is not affected without affecting safe driving. Can be fully recognized.
[0044]
In the above-described embodiment, when the traveling speed of the host vehicle is reduced to a predetermined speed or less in a state where the enlarged view of the intersection is displayed on the screen of the display device 7, the enlarged view of the intersection is reduced and displayed. Although the case has been described as an example, it is needless to say that the conditions for displaying the enlarged view of the intersection in a reduced size are not limited to this. For example, there may be a case where it is necessary to temporarily stop before the intersection due to traffic jams, etc., and in such a case, an enlarged view of the intersection should be displayed in a reduced size when the vehicle is completely stopped. May be. An example of the processing flow in that case is shown in FIG.
[0045]
Referring to FIG. 6, in the first step S11, in the same manner as the process performed in step S1 of FIG. 5, the control unit 18 performs a predetermined process until the next intersection on which the host vehicle should change the course on the guidance route GR. 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. 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 left and right screens via the image composition unit 23 based on the control from the control unit 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 the host vehicle has stopped and a predetermined time, for example, 2 to 3 seconds has elapsed (YES) or not (NO). Whether or not the own vehicle has stopped can be determined based on 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 S3 of FIG. If the determination result is YES, the process proceeds to step S14, and if 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 on which an enlarged view of the intersection is displayed via the image composition unit 23 based on control from the control unit 18. Reduced display (FIG. 4).
[0049]
In the next step S15, the control unit 18 detects that the own vehicle has started to move (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, as in the process performed in step S6 in FIG. 5, the control unit 18 determines whether 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. If the determination result is NO, the determination process is repeated.
[0052]
In the next step S18, the display device 7 cancels the enlarged display of the intersection through the image composition 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, in the same manner as the process performed in step S8 of FIG. 5, the control unit 18 determines whether or not the traveling direction at the intersection is along the original guidance route GR (YES) (NO) When the determination result is YES, the process flow is “end”, and when the determination result is NO, the process proceeds to step S20.
[0054]
In the last step S20, a reroute search is performed in the same manner as the process performed in step S9 in FIG. Then, this processing flow is “end”.
[0055]
  According to the processing flow shown in FIG.The above form (Processing flow shown in FIG.)In the same manner as in the case of FIG. 3, in the state where the enlarged view of the intersection where the course should be changed next is displayed on the screen of the display device 7 on the guidance route on which the vehicle is guided (FIG. 3, step S12), When the car stops and a predetermined time (2 to 3 seconds) has elapsed (in the case of YES at step S13),In the lower right corner of the display screen 40 as illustrated in FIG.An enlarged view of the intersection is displayed in a reduced size(StepS14). As a result, the above formin the case ofThe same effect can be achieved.
[0056]
In the processing flow shown in FIG. 6, when the stop state is detected once (step S13), an enlarged view of the intersection is displayed in a reduced scale (step S14). In such a case, when the stop state is detected a plurality of times (for example, twice), an enlarged view of the intersection may be displayed in a reduced size. Good. In this case, a process of determining whether or not the number of times of detection of the stop state has reached a predetermined number (for example, twice) is added between step S13 and step S14.
[0057]
【The invention's effect】
  As described above, according to the vehicle-mounted navigation device according to the present invention, when a predetermined condition is satisfied in a state where an enlarged view of an intersection to be changed next on the guidance route is displayed on the display screen. In, In a place (corner of the screen) that is not visually disturbing on the screenReduce the enlarged view of the intersectionSo thatWithout requiring a troublesome operation for the user, it is possible to easily find the detour when searching for another route (detour) different from the guide route due to a traffic jam or the like on the screen.
[Brief description of the drawings]
FIG. 1 is a block diagram schematically showing the configuration of an in-vehicle 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 illustrating 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 displayed in a reduced size.
FIG. 5 is a flowchart showing an example of processing related to an enlarged / reduced display of an intersection performed by the in-vehicle navigation device of FIG. 1;
6 is a flowchart showing another example of processing related to the enlarged / reduced display of an intersection performed by the in-vehicle navigation device of FIG. 1. FIG.
[Explanation of symbols]
1a ... CD-ROM (memory means),
2 ... operation part,
4 ... GPS receiver,
6 ... Self-contained navigation sensor (vehicle speed detection means),
7: Display device (display means),
10 ... navigation device body,
18 ... control part (control means),
19 ... Map drawing part,
20 ... operation screen / mark generator,
21 ... guide route storage unit,
22 ... guide route drawing unit,
23. Image composition unit,
30 ... In-vehicle navigation device,
40 (L, R) ... display screen,
41, 41a, 41b ... map images,
CM ... Own vehicle position mark,
GR: Guide route,
A to C: Icons indicating each property.

Claims (5)

Display means for providing guidance information;
Vehicle speed detecting means for detecting the traveling speed of the own vehicle;
Control means operably connected to the display means and vehicle speed detection means,
The control means is a travel detected by the vehicle speed detection means in a state in which an enlarged view of an intersection whose course is to be changed next is displayed on the screen of the display means on the guidance route on which the vehicle is guided. An in-vehicle navigation device characterized in that, when a stop state is detected based on speed, an enlarged view of the intersection is reduced and displayed on any one of the four corners of the screen on the display means. Said control means, wherein said stop state before the vehicle reaches the intersection, characterized in when it detects that it has continued for a predetermined period of time, be reduced display an enlarged view of the intersection with respect to the display means The in-vehicle navigation device according to Item 1 . 2. The control unit according to claim 1 , wherein when the vehicle detects the stop state a plurality of times before the vehicle reaches the intersection, the control unit causes the display unit to reduce and display an enlarged view of the intersection. Car navigation system. When the control means detects that the stop state has been released before the vehicle reaches the intersection, the control means displays the enlarged enlarged view of the intersection displayed on the display means before the reduced display. The in-vehicle navigation device according to claim 1 , wherein the navigation device is displayed. It further comprises memory means for storing map data,
The control means is configured to refer to the map data stored in the memory means and based on the current position of the own vehicle obtained by performing arithmetic processing on the travel speed detected by the vehicle speed detection means. intersection until it is determined whether or not reached a predetermined distance, when it reaches a predetermined distance, one of claims 1, characterized in that to display an enlarged view of the intersection on the screen of the display means 4 The in-vehicle navigation device according to claim 1.

Images