JP3878403B2 - Car navigation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle navigation device, and more particularly, to an in-vehicle navigation device that searches for a guidance route to a destination and displays a guidance map of a guidance intersection when the user approaches a guidance intersection for guidance.
[0002]
[Prior art]
A navigation device that provides vehicle travel guidance so that a driver can easily reach a desired destination, detects the position of the vehicle, reads map data around the vehicle from a CD-ROM or DVD-ROM, and maps Is displayed on the display screen, and a vehicle position mark (own vehicle position mark) is superimposed and displayed at a predetermined location on the map. Then, as the current position changes due to the movement of the vehicle, the vehicle position mark on the screen is moved, or the vehicle position mark is fixed at a predetermined position in the center of the screen and the map is scrolled to always move around the vehicle position. The map information can be seen at a glance.
[0003]
In general, a navigation device is equipped with a route guidance function that allows a user to easily travel to a desired destination without making a mistake on the road. This route guidance function uses map data to automatically search for the lowest cost route from the starting point to the destination by performing a simulation calculation such as the horizontal search method or Dijkstra method, and guides the searched route. The route is memorized as a route, and the guide route is displayed thickly on the map image while changing the color from other roads while driving, or the route is displayed at the intersection where the route to the destination should be changed When the user approaches a predetermined distance from the intersection to bend, the user is guided to the destination by voice guidance. During actual traveling, when approaching an intersection to be changed to a predetermined distance (for example, 100 meters), a guide enlarged view of the intersection to be turned is displayed for guidance.
[0004]
When the intersection guidance is not displayed during traveling, the next guidance intersection enlarged view can be displayed by the user's operation so that the shape of the next guidance intersection and the direction to proceed can be confirmed. Yes.
[0005]
[Problems to be solved by the invention]
By the way, when approaching an intersection to be turned while driving along the guidance route, the driver looks at the enlarged view of the intersection displayed on the screen, confirms the direction to proceed, changes the lane, The situation of the intersection of the vehicle must be confirmed, and the burden on the driver may be heavy. In particular, when the intersection is a five-way road or a complex intersection such as a complex intersection where a plurality of intersections are nearby, the burden on the driver tends to increase.
[0006]
If you know the shape of the next intersection, the direction of travel, and landmarks such as landmarks before approaching the intersection, the burden on the driver when approaching the intersection will be reduced, but the guidance intersection will be expanded away from the intersection. In order to display the figure, the operation unit had to be operated one by one, which was troublesome. Since it is cumbersome to perform an operation to display an enlarged view of the next intersection while the vehicle is traveling, the operation is performed while the vehicle is stopped while waiting for a signal to display an enlarged view of the next guidance intersection. Will be confirmed. It was troublesome to operate the operation unit to display an enlarged view of the guidance intersection.
[0007]
As described above, an object of the present invention is to provide an in-vehicle navigation device that can easily obtain information on the next guidance intersection while the vehicle is stopped.
[0008]
[Means for Solving the Problems]
According to the present invention, according to the present invention, the guidance route to the destination is displayed, and when the vehicle approaches the guidance intersection on the guidance route, the guidance map of the guidance intersection is displayed and displayed by the display means. In the in-vehicle navigation device, when the vehicle stop is detected by the vehicle travel detecting means for detecting the stop of the vehicle, a guide map of the next intersection on the guidance route is displayed on the display means. Control means, and when the distance from the vehicle position to the next intersection is greater than a predetermined distance, the vehicle running detection means has stopped the vehicle or the vehicle speed has fallen below a predetermined value. This is achieved by not displaying the next guidance intersection guide map .
That is, if constructed as described above, can be displayed when the vehicle travels along the guidance route to a destination, automatically enlarged view of the next guidance intersection When the vehicle is stopped, also, the following When the distance to the next guide intersection is large, an enlarged view of the next guide intersection is not displayed even if the vehicle stops.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
(A) Configuration of Navigation Device FIG. 1 is a diagram showing the configuration of the navigation device. In the figure, 11 is a storage medium such as a DVD-ROM storing map information, 12 is a DVD-ROM control unit for controlling reading of map information from the DVD-ROM, and 13 is a position measuring device for measuring the current position of the vehicle. It is. 14 is a map information memory for storing the map information read from the DVD-ROM, 15 is a guide route memory for storing the set guide route, 16 is a control unit for controlling the entire apparatus, and 17 is for generating a map to be displayed on the screen. The first display controller 18, the first video RAM 18 for storing the map image generated by the first display controller 17, the second display controller 19 for generating an enlarged intersection, and the intersection 20 generated by the second display controller 19. A second video RAM for storing an enlarged view, 21 is an image composition unit for synthesizing and outputting various images, 22 is a display unit for displaying a map image output from the image composition unit, 23 is an operation unit, and 24 is a bus. is there. In addition to the above, although not shown, there are a vehicle position mark generating unit, a menu image generating unit, and the like, and the images generated in each are input to the image combining unit 21 and appropriately combined and output.
[0012]
The map stored in the DVD-ROM 11 is divided into longitude and latitude widths of appropriate sizes according to the scale level such as 1/12500, 1/25000, 1/50000, 1/100000, etc. Are stored as a coordinate set of vertices (nodes) expressed in longitude and latitude. A road is formed by connecting two or more nodes, and a portion connecting two nodes is called a link. The map data includes (1) a road layer including a road list, a node table, and an intersection configuration node list, and (2) a background layer for displaying roads, buildings, facilities, parks, rivers, and the like on the map screen. (3) It includes character / symbol layers for displaying characters such as administrative division names such as municipalities, road names, intersection names, and building names, and map symbols.
[0013]
The position measuring device 13 includes a relative azimuth sensor 13a such as a vibration gyro that detects the rotation angle of the vehicle, a distance sensor 13b that generates one pulse for each predetermined travel distance, a GPS receiver 13c, and a position calculation CPU (not shown). Etc.). The GPS receiver 13c receives data indicating the current date and time together with position information sent from a GPS satellite.
[0014]
The map information memory 14 stores map information such as map data read from the DVD-ROM 11, candidate site information, and the like, and the guide route memory 15 stores a guide route to a set destination. .
[0015]
The control unit 16 controls the entire navigation device. The control unit 16 controls the DVD-ROM control unit 12 to read out map data of the area around the vehicle from the DVD-ROM 11 and stores the read map information in the map information memory 14. Let Then, based on the map information stored in the map information memory 14, the first display controller 17 generates a map image around the vehicle position and stores the map image in the first video RAM 18, and the second display controller 19 guides. An enlarged intersection map of the next guidance intersection on the route is generated and stored in the second video RAM 20.
[0016]
Further, the control unit 16 searches for an optimum route to the destination and stores it in the guide route memory 15 as a guide route, or based on the guide route information stored in the guide route memory 15, Change the color so that it is displayed thicker than other roads, or based on the guidance route information stored in the guidance route memory 15, an arrow is displayed on the intersection enlarged view of the intersection to be bent, or the current input from the position measurement device 13 From the position information and the guide route information stored in the guide route memory 15, voice guidance is performed when approaching a certain distance from the intersection to be turned. For example, when a predetermined distance is approached to the guidance intersection, an enlarged view of the intersection at the guidance intersection is displayed, an arrow indicating the direction in which the intersection should be bent is displayed, and guidance is given by voice.
[0017]
Further, the control unit 16 causes the second display controller 19 to generate an intersection enlarged view of the next guidance intersection from the vehicle position toward the destination based on the guidance route information stored in the guidance route memory 15. When the vehicle is stopped when stored in the second video RAM 20, a map image around the vehicle position stored in the first video RAM and an enlarged view of the next guidance intersection stored in the second video RAM are displayed in the image composition unit. 21 and the image is displayed on the display unit 22.
[0018]
The distance sensor 13b of the position measuring device 13 can detect whether the vehicle is running or stopped by generating one pulse for each predetermined distance. It is also possible to detect whether the vehicle is running or stopped by turning on / off the parking brake in addition to the vehicle speed pulse.
[0019]
The control unit 16 determines that the distance from the guidance route stored in the guidance route memory 15 and the current position of the vehicle measured by the position measurement device 13 to a guidance point on the guidance route is a predetermined distance, for example, a distance from a guidance intersection. At this time, an enlarged view of the intersection of the guidance intersection is generated by the second display controller 19 and displayed on the display unit 22. In addition, when the vehicle position measurement device 13 detects a stop of the vehicle, the control unit 16 determines that the distance from the vehicle position to the next guidance intersection on the guidance route is within a predetermined distance (for example, 10 km). In addition, an enlarged view of the next guidance intersection is generated by the second display controller 20 and displayed on the display screen of the display unit 22, and when the vehicle starts traveling, the intersection enlarged view display is terminated. When displaying the enlarged intersection map of the next guidance intersection when the vehicle is stopped, it is desirable to display an enlarged map of the guidance intersection along with the distance from the vehicle position to the guidance intersection. By displaying the distance from the vehicle position to the next guidance intersection, it is possible to confirm the distance from the vehicle current position to the next intersection where the vehicle should turn and the enlarged view of the intersection when the vehicle stops.
[0020]
(B) Operation Flow FIG. 2 is a diagram showing an operation flow when displaying an enlarged intersection view of the in-vehicle navigation device of the present invention. Here, the user has set a destination in advance, and a guidance route to the destination is searched and stored in the guidance route memory 15. It is assumed that the vehicle is guided according to the guidance route stored in the guidance route memory 15.
[0021]
First, the control unit 16 determines whether or not the vehicle position measured by the position measuring device 13 has approached the next guidance intersection on the guidance route stored in the guidance route memory 15 to a predetermined distance (for example, 100 m). (Step S101).
[0022]
If the vehicle is not approaching the next guidance intersection in step S101, the control unit 16 determines whether or not the vehicle has stopped from the pulse from the distance sensor 13b of the position measuring device 13 (step S102).
[0023]
When the vehicle stops in step S102, the control unit 16 determines that the distance from the current vehicle position measured by the position measuring device 13 to the guidance intersection on the guidance route stored in the guidance route memory 15 is a predetermined distance (here, 10 km). ) Is determined (step S103).
[0024]
If the distance from the current position of the vehicle to the next guidance intersection is smaller than the predetermined distance (10 km) in step 103, the control unit 16 controls the second display controller 19 to generate an intersection enlarged view of the next guidance intersection. Then, the next enlarged guide intersection is displayed on the display unit 22 (step S104).
[0025]
When an enlarged view of the next guidance intersection is displayed in step S104, the control unit 16 determines whether or not the vehicle has started running based on the vehicle speed pulse from the distance sensor 13b of the position measuring device 13 (step S105). If the vehicle is not traveling, the process returns to step S104, and the enlarged map display of the next guidance intersection is continued.
[0026]
When the vehicle is not stopped at step S102, when the distance to the next guidance intersection is larger than the predetermined distance at step S103, or when the vehicle starts running at step 105, the control unit 16 controls the first display controller. Then, the second display controller is controlled to switch from the enlarged intersection display to the normal map display (step S106). When the normal map display is obtained in step S106, the process returns to step S101 to determine again whether the distance to the next guidance intersection is smaller than the predetermined distance (100 m), and the processing is continued.
[0027]
In step S101, when the vehicle position approaches the next guidance intersection on the guidance route by a predetermined distance, the control unit 16 displays an enlarged view of the intersection of the next guidance intersection and performs voice guidance (step S107).
[0028]
Next, the control unit 16 determines whether or not the vehicle has passed the guidance intersection (step S108). If the vehicle has not passed the guidance intersection, the control section 16 returns to step S107 and continues the intersection enlarged map display, and continues to the guidance intersection. When the vehicle passes, the display is switched from the enlarged intersection display to the normal map display (step S109).
[0029]
(C) Display Example FIG. 3 is a diagram showing a display example of the navigation device of the present invention. FIG. 3A shows a normal map display, and FIG. 3B shows a display example of an enlarged intersection view. DSP is a display screen, RD is a road, CM is a vehicle position mark indicating the current position of the vehicle, GL is a guide route indicating a route to the destination, and SD is an enlarged view of an intersection.
[0030]
While the vehicle is traveling, as shown in FIG. 3A, a map around the vehicle position is displayed on the display screen. When the vehicle stops due to a signal waiting or the like, as shown in FIG. 3B, the next guidance intersection enlarged view on the guidance route GL is displayed on the display screen DSP together with the map around the vehicle. In the enlarged intersection view SD, a distance DST from the vehicle position to the next guidance intersection is displayed, a landmark serving as a landmark at the intersection, and an arrow AR indicating a direction to travel are displayed. When the intersection enlarged view shown in FIG. 3 (b) is displayed, when the vehicle starts traveling, the intersection enlarged view display is stopped and the map display shown in FIG. 3 (a) is switched.
[0031]
In this way, even if the distance from the vehicle position to the next guidance intersection is far, when the vehicle stops, the intersection enlarged view of the next guidance intersection is automatically displayed and the vehicle is stopped. It becomes easy to confirm the shape of the next intersection in the meantime.
[0032]
In the description of the above embodiment, when the vehicle stops, an enlarged view of the next guidance intersection is displayed together with a map around the vehicle. However, the next enlarged view of the guidance intersection is displayed on the entire display. It may be.
[0033]
In the description of the above embodiment, an enlarged view of the next guidance intersection is displayed as soon as the stop of the vehicle is detected, but the vehicle is stopped for a predetermined time after the stop of the vehicle is detected. When the is continued, an enlarged view of the next guidance intersection may be displayed. In this way, an enlarged view of the intersection can be displayed when the stop time is long, such as waiting for a signal at a red light, without displaying an enlarged view of the intersection during a short stop time such as a temporary stop.
[0034]
(D) Modification In the description of the above embodiment, if a vehicle stop is detected while the vehicle is traveling along the guidance route, an enlarged view of the next guidance intersection on the guidance route is displayed. When the vehicle speed becomes a predetermined value or less, an enlarged view of the next guidance intersection can be displayed.
[0035]
Based on the vehicle speed pulse input from the distance sensor 13b of the position measuring device 13, the control unit 16 detects the guidance stored in the guidance route memory 15 when the vehicle speed becomes a predetermined value (for example, 10 km / h) or less. With reference to the route, an enlarged view of the next guidance intersection is generated by the second display controller 19 and displayed on the display unit 22. When the vehicle speed exceeds a predetermined value, the intersection enlarged map display is stopped and the normal map display is switched.
[0036]
In the modified example, in the operation flow of the embodiment shown in FIG. 2, instead of determining whether or not the vehicle has stopped in step S102, the control unit 16 sets the traveling speed based on a pulse input from the distance sensor 13b. It is determined whether or not it is a value (for example, 10 km / h) or less, and instead of determining whether or not the vehicle has started running in step S105, the control unit 16 is input from the distance sensor 13b. This can be realized by determining whether or not the traveling speed is equal to or higher than a predetermined value (10 km / h) based on the pulse.
[0037]
The present invention has been described with reference to the embodiments. However, the present invention can be variously modified in accordance with the gist of the present invention described in the claims, and the present invention does not exclude these.
[0038]
【The invention's effect】
As described above, according to the present invention, when the vehicle stops while traveling along the guidance route to the destination, an enlarged view of the next guidance intersection is automatically displayed. When stopping at a wait or the like, the shape of the intersection to be bent next can be easily confirmed, and preparations such as a lane change can be made with a margin before approaching the intersection to be bent. Moreover, since the next guidance intersection enlarged view is seen while the vehicle is stopped, even in the case of a complicated intersection, it is possible to grasp the direction to proceed before approaching the intersection.
[0039]
In addition, according to the present invention, when the vehicle is at a predetermined distance or more away from the vehicle position to the next guidance intersection, the intersection enlarged view is not displayed even if the vehicle stops, and the route along the road continues for a while. In this case, the intersection enlarged view is not displayed every time the vehicle stops, and it is not troublesome.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a navigation device.
FIG. 2 is a diagram illustrating an operation flow when an enlarged intersection view is displayed.
FIG. 3 is a diagram showing a display example of an intersection enlarged view.
[Explanation of symbols]
11 ... DVD-ROM
DESCRIPTION OF SYMBOLS 13 ... Position measuring device 15 ... Guidance path memory 16 ... Control part 17 ... 1st display controller 19 ... 2nd display controller 21 ... Image composition part 22 ... Display part

Claims (1)

In an in-vehicle navigation device that displays a guidance route to a destination and displays a guidance map of a guidance intersection on a display means when the vehicle approaches a guidance intersection on the guidance route by a predetermined distance.
Vehicle travel detection means for detecting stop of the vehicle;
Control means for displaying a guide map of the next intersection on the guide route by the display means when a vehicle stop is detected by the vehicle travel detection means ,
If the distance from the vehicle position to the next intersection is greater than a predetermined distance, the control means may detect that the vehicle has stopped or the vehicle speed has become a predetermined value or less by the vehicle travel detection means. An in-vehicle navigation device characterized by not displaying a guide map of the next guidance intersection .

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