JP2512567Y2 - In-vehicle navigation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] (Field of Industrial Use) This invention is based on a map read from a storage means, a route connecting any two points, and a group of intersections existing in the route. The present invention relates to a vehicle-mounted navigation device that actively searches for vehicles.

(Prior Art) As a conventional navigation device, for example, there is the following device.

That is, there is an article written by Hirohisa Kawashima, a professor at Keio University, about ALI-SCOUT, a system that applies infrared beacons developed in West Germany.

To do this, the driver inputs his position and destination using the coordinate axes of the map, and the command from the central computer displays the distance to the intersection (turning angle) where the beacon is placed (turning angle) and the direction in which the route is to be guided. It is shown.

Further, as a navigation system without a beacon facility, there is one disclosed in Japanese Patent Laid-Open No. 1-223600. This is also the one in which the distance and the direction of the intersection to be turned are displayed by the vehicle-mounted device as described above.

(Problems to be solved by the invention) However, in such a conventional vehicle-mounted navigation device, the distance to the intersection where the driver bends so that the driver can easily see it must be roughly displayed as 50 m or 100 m. Therefore, there is a difference from the actual traveled distance. Therefore, if there are some intersections near the target intersection, there is a problem that it is not known which intersection to turn.

Then, this invention aims at solving the said subject by providing the vehicle-mounted navigation device which can know a turning intersection reliably.

[Constitution of device]

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides a storage means for storing a map, a current position calculation means for calculating the current position of a vehicle, and two arbitrary points. , Route calculating means for obtaining a route connecting the two points based on the map read out from the storage means, separating means for dividing the intersection into left and right intersections and other intersections, and the above separation Among the intersections required to be turned left and right obtained by the means, the vehicle is passed between the means for selecting the first intersection that reaches the earliest from the current position by the current position calculation means and the time until the first intersection is reached. An in-vehicle navigation device having means for searching for a second group of intersections that do not turn left and right, means for counting the number of second intersections, and display means for displaying the counted number of intersections is configured. .

(Operation) It is assumed that the driver comes to a point where there are some intersections to be turned while traveling by the route guidance.
Therefore, for example, when the switch is turned on to calculate the current position, the current position by the position sensor is collated and displayed on the guide route (map), and the number of intersections up to the closest intersection to the current position should be curved. Displayed with direction. By knowing the number of intersections to be turned, the driver actually counts the number of intersections that pass in sequence, and at the intersections that match the displayed number and turns in that direction, in this way There is no doubt that the vehicle can follow the guidance route.

(Embodiment) An embodiment of the present invention will be described below in detail with reference to the drawings of FIGS.

First, the configuration will be described with reference to FIG. The navigation controller 20 is a computer (CP
U) 21, a read storage device (ROM) 22, a storage device 23 that randomly stores information at each time, and map information from a storage device (CD-ROM) 18 that stores maps on a CD-ROM DMA (DIRECT MEMORY ACCES) received via drive 16
S) 26, geomagnetic sensor 10, gyro 12, vehicle speed sensor 13
(These correspond to the means 15 for calculating the current position of the vehicle) and the input / output means (I / O) 25 for inputting / outputting the input SW 14 for designating any two points, and the route based on these information And a route calculating means (GDC) 24 for calculating

Then, the calculated route is displayed on the display (display means) 30.

In the present embodiment according to the present invention, in addition to these conventional devices, there is newly provided a separating means 1 for dividing an intersection in which a left / right folding is required and an intersection not requiring a left / right folding, and a left / right folding obtained by this separating means 1. Selecting means 2 for selecting the first intersection that reaches the earliest from the position corresponding to the current position calculated by the current position calculating means 15 among the intersections that require
The controller 20 includes an intersection group searching means 3 for searching for a second intersection group that does not turn left and right before reaching the intersection, and an intersection group number counting means 4 for counting the number of the second intersection group. Have been added to.

First, the route search routine will be described step by step with reference to FIG.

First, when the input switch 14 is turned ON, it becomes a mode to input the start point (102), gradually limiting the area from the map of each place in the CD-ROM 18 and starting on the detailed map. Enter the point (10
Four). If not input (NO), return to the start point,
Repeatedly (112).

After inputting the start point, similarly input the destination (106 and 108). When the controller 20 operates the route calculation means 24 and then enters the route search mode (110), first, the destination is set in the work area, and then the traveling direction is set from the intersection close to the destination.

As for this traveling direction, the traveling direction is set at the intersection in front of the destination, and then the traveling direction is sequentially set at the intersection before the destination. The route thus set is displayed on the display 30.

Next, a routine for displaying the actual direction and the number of intersections when the vehicle is guided by following the route set as described above and will be described step by step with reference to FIG. .

This routine may be executed either time-synchronized or distance-synchronized.
It is supposed to be calculated by interruption.

First, the current position of the vehicle is calculated by the calculation means 15 (202).

This is to estimate the current position from the geomagnetic sensor 10, the gyro 12 and the vehicle speed sensor 13 as the calculation means 15,
By comparing and collating with the map data stored in M18, an accurate position is obtained on the route set as above. As a method for this purpose, the map matching method is the most general method and has been put into practical use.

When the calculation of the current position is completed, it is judged whether or not the route search is completed (204), and if completed, it is checked whether or not the vehicle is traveling on the displayed route (206). If not completed (NO), it will be repeated (RETURN) (22
Four).

As a result of the investigation, if it is out of the route (NO), “I departed from the route” is displayed (208), and the process ends (RETUR
N) becomes (220).

However, if the user is on the route (YES), the first node (intersection) on the route is read out from the current position and searched (210).

Then, it is judged whether the node is an intersection to be bent or not based on the result of the route search by the separating means 1, the selecting means 2 and the intersection group searching means 3 (212), and if it is not a bending intersection (NO), the counting means 4 is used. Count up (21
4) Then, the node at the next time is read out (216) and the process is repeated (222).

If it is a bending node (YES), it counts up and the displayed number and the bending direction are displayed on the display 30 (226).

As an example of the display, a display as shown in FIG. 4 can be considered.

That is, it is displayed as "Turn left at the fifth intersection" while moving forward. If the result of the investigation in step 206 is incorrect, it is displayed as "lost from the route" as shown in the lower part.

By performing such processing with the navigation controller 20, it is possible to display the number of intersections up to the intersection to be turned, and in the place where there are many intersections,
The driver can easily know the turning intersection by counting the number of intersections, and if the vehicle turns in the direction as instructed, it will be a correct driving according to the route guidance.

In addition, if the distance to the intersection to be bent, which is conventionally used, is also displayed, it becomes easier to use.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there are changes and the like within the scope not departing from the gist of the present invention. It is included in the device.

[Effect of device]

As is clear from the above description, according to the vehicle-mounted navigation device according to the present invention, in a place where there are many intersections, the driver can easily know the intersection to turn by counting the number of intersections. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a system block configuration diagram showing an embodiment of an in-vehicle navigation device according to the present invention, FIG. 2 is a flow chart of route search processing, and FIG. 3 is processing for searching a traveling direction of a vehicle and the number of intersections according to the present invention. FIG. 4 is a display image showing a display example according to the present invention. 1: Separation means 2: Selection means 3: Intersection group search means 4: Intersection group number counting means 10: Geomagnetic sensor 12: Gyro 13: Vehicle speed sensor 14: Input SW 15: Current position calculation means 16: CDROM drive 18: CDROM 20 : Controller 21: CPU 22: ROM 23: RAM 24: GDC (route calculation means) 25: I / O (input / output means) 26: DMA (direct memory access)

Front page continued (72) Inventor Takashi Nomura 2 Takara-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (56) Reference JP-A-2-69617 (JP, A) JP-A-2-57910 (JP , A)

Claims (1)

(57) [Scope of utility model registration request] 1. When a storage means for storing a map, a current position calculation means for calculating a current position of a vehicle, and two arbitrary points are designated, the two points are determined based on the map read from the storage means. Of the route calculation means for obtaining the connecting route, the separation means for dividing left and right intersections in the route and the intersections not requiring the same, and the intersection obtained by the separation means that requires the left and right turns, the present A means for selecting the first intersection which reaches the earliest from the current position by means of the position calculating means, a means for searching for a second intersection group which does not turn left and right before reaching the first intersection, and Second
The vehicle-mounted navigation device having means for counting the number of intersection groups and display means for displaying the counted number of intersection groups.