JP2782760B2 - Car navigation system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an in-vehicle navigation device.

[Conventional technology]

FIG. 6 is a block diagram showing a conventional in-vehicle navigation device disclosed in, for example, Japanese Patent Application Laid-Open No. 63-189883. In the figure, reference numeral 2 denotes operation means for inputting current position information and the like of a vehicle; 4 denotes control means for performing various controls for navigation; 5 denotes display means for displaying current position information and map information of the vehicle. , 6 are map information reproducing means for storing and reproducing map information in advance, and 16 is an azimuth distance sensor for detecting and outputting the azimuth and distance of the vehicle.

Next, the operation will be described. When the current position of the vehicle is set by the operation means 2, the control means 4 reads map information around the current position from the map information reproducing means 6 based on the set position information, and displays the map information and the current position of the vehicle on the display means 5. Draw a vehicle position mark to indicate. While the vehicle is running, the control means 4 obtains the current position of the vehicle based on the azimuth and distance information from the azimuth distance sensor 16 and updates the display position of the own vehicle position mark.
Scrolls the map display so that it is the center of the display by. Each time a new map display is required by the above operation, the control means 4 reads the map information from the map information reproducing means 6 and draws it on the display means 5.

[Problems to be solved by the invention]

Since the conventional in-vehicle navigation device is configured as described above, map information is read out and drawn every time a new map display is required, so that map drawing can follow when the speed of the vehicle is high. However, there is a problem that scrolling is not performed smoothly.

The present invention has been made in order to solve the above-described problems, and has as its object to provide an in-vehicle navigation device that can smoothly scroll a map display even when the speed of a vehicle increases.

[Means for solving the problem]

The in-vehicle navigation device according to the present invention scrolls and displays a road map such that the own vehicle position mark is at the center of the display, based on the position detection unit, the speed detection unit, and the current position detected by the position detection unit. A map display unit, and when the amount of information required for scroll display is equal to or more than a predetermined amount, if the traveling speed of the vehicle detected by the speed detection unit is within a predetermined speed range, the vehicle corresponds to the speed range. A map based on the obtained road data is displayed, the amount of information required for scroll display by the map display means is reduced, and road data is separately stored according to the speed range.

(Operation)

The on-vehicle navigation device according to the present invention, the road type of the road scroll displayed by the map display means,
The road type is determined in accordance with the traveling speed of the vehicle detected by the speed detecting means, and the road type of the displayed road is determined so that the scroll display can be performed smoothly.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First
FIG. 1 is a block diagram showing an apparatus configuration according to an embodiment of the present invention.
6 is attached and the description is omitted. However, the map information reproducing means 6 stores and reproduces map information including road data expressed as a set of coordinate points for each road type, with the maximum speed of the road as the road type. FIG. 2 shows a configuration example of road data in the map information. In Fig. 2, road types 0, 1, and 2 indicate the maximum speed limits of 100km / h, 80km / h, and 60.
km / h or less, and each road coordinate is represented by node coordinates 1... n.

1 is a speed detecting means for detecting the running speed of the vehicle, and 3 is a position detecting means for detecting the current position of the vehicle from the azimuth and running distance of the vehicle, and is connected to the speed detecting means 1 and the control means 4. The control means 4 receives an output signal from the speed detection means 1.

FIG. 3 is a diagram for explaining a scroll operation of map display according to one embodiment of the present invention. In FIG. 3, reference numerals 7 and 8 denote map drawing areas, and reference numeral 9 denotes a display window.

FIG. 4 shows a display example of road data according to an embodiment of the present invention. FIG. 4 (a) shows a state where only a specific road type is displayed, and FIG. 4 (b) shows a state where all roads are displayed. Is shown.

Next, the operation of the device having such a configuration will be described with reference to FIGS. Setting position information by the operation means 2,
Alternatively, the position information from the position detecting means 3 is set as the current position of the vehicle, the control means 4 reads map information around the current position from the map information reproducing means 6, and displays the map information and the own vehicle position mark on the display means 5. .

While the vehicle is traveling, the current position is updated sequentially by the position information from the position detecting means 3, and the display window 9 is set to the arrow shown in FIG. 3 so that the own vehicle position mark is always at the center of the display of the display means 5. , And draws in the map drawing area 8. At this time, the speed is detected by the speed detecting means 1, the road type is determined according to the speed, and drawing is performed, for example, as shown in FIG. 4 (a) or (b). Since the road data in the map information in the map information reproducing means 6 has the structure shown in FIG. 2, the node coordinates are converted into display coordinates, and the road is displayed by connecting them with straight lines. Draw by means 5. In addition, the road type is distinguished and displayed according to the color and width of the road display line.

Next, the operation of displaying a map of a road type according to the speed of the vehicle will be described with reference to the flowchart of FIG. In the figure, SP
Is the speed detection information of the speed detecting means 1 in proportion to the speed of the vehicle, SPth is a speed threshold for drawing determination, and α and β are positive constants for providing a hysteresis characteristic. Steps
At 10, it is determined whether or not the speed detection information SP exceeds a value obtained by adding the constant α to the speed threshold value SPth. If not, at step 11, all roads are drawn and the process is terminated.
FIG. 4B is a drawing example of the road at this time. Steps
If it is determined in step 10 that SP> SPth + α, the process proceeds to step 12, and only the roads whose maximum speed limit is equal to or higher than the speed threshold value SPth are drawn. That is, if it is determined that SP> SPth + α, the vehicle moves to the speed threshold SP.
It is assumed that the vehicle is traveling on a road having a maximum speed limit equal to or greater than th, and only the relevant road is drawn, and other roads are not drawn. FIG. 4A shows an example of drawing a road at this time, and the amount of information required for drawing is smaller than that of the drawing example of FIG. 4B in the same district. This shortens the drawing time and enables smooth scrolling even during high-speed running.

After performing the processing of step 12, the display window 9
Is moved, the map drawing area 8 is displayed, and thereafter, it is determined in step 13 whether or not the display window 9 has moved out of the area 8. If it is determined that the vehicle is out of the area, a series of processing ends, and if it is determined that the vehicle is not out of the area, the process proceeds to step. In step 14, it is determined whether or not the speed detection information SP is less than a value obtained by subtracting the constant β from the speed threshold value SPth. If not, the process returns to step 13, and if not, the remaining roads are drawn in step 15. A series of processing ends. With the drawing in step 15, necessary information can be displayed even when the vehicle shunts on a road with a lower maximum speed limit.

In the above embodiment, the current position of the vehicle is displayed by the own vehicle position mark. Alternatively, the traveling locus of the vehicle may be displayed based on the position information from the position detecting means.

Further, in the above embodiment, the reproduction display of the map information is not restricted as shown in FIG. 4B, but the display is restricted as shown in FIG. Only the road data may be reproduced and displayed.

When the map information amount is equal to or more than the predetermined amount, the operation is performed as in the above-described embodiment, and when the map information amount is less than the predetermined amount, all the roads may be displayed.

〔The invention's effect〕

As described above, according to the present invention, the road type to be drawn is determined and drawn according to the speed of the vehicle, so that it is possible to display necessary map information and to smoothly scroll the map display. Has the effect.

[Brief description of the drawings]

FIG. 1 is a block diagram of an on-vehicle navigation device according to one embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of the configuration of road data in map information according to one embodiment of the present invention, and FIG. FIG. 4 is an explanatory diagram for explaining a scroll operation according to an embodiment of the present invention. FIG. 4 is a diagram showing an example of drawing road data according to an embodiment of the present invention. FIG. 5 is an operation of the apparatus according to an embodiment of the present invention. FIG. 6 is a flowchart showing a main part of the procedure, and FIG. 6 is a block diagram showing a configuration example of a conventional on-vehicle navigation device. In the figure, 1... Speed detecting means, 3... Position detecting means, 4.
... Control means, 5 ... Display means, 6 ... Map information reproducing means. In the drawings, the same reference numerals indicate the same or corresponding parts.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-130412 (JP, A) JP-A-2-126112 (JP, A) JP-A-62-154098 (JP, A) JP-A-62-1 153887 (JP, A) JP-A-63-265113 (JP, A) JP-A-1-161111 (JP, A) JP-A-59-201199 (JP, A) JP-A-58-208619 (JP, A) Japanese Utility Model Application Showa 64-19117 (JP, U) Japanese Utility Model Application Hei 1-104514 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01C 21/00 G09B 29/00

Claims (1)

(57) [Claims] 1. A position detecting means for detecting a current position of a vehicle; a speed detecting means for detecting a traveling speed of the vehicle; and a current position detected by the position detecting means, the own vehicle position mark is displayed at the center of the display. Map display means for scroll-displaying the road map so that the traveling speed of the vehicle detected by the speed detection means is equal to or greater than a predetermined speed when the amount of information required for the scroll display is equal to or greater than a predetermined amount. Area, a map based on the road data corresponding to the speed range is displayed, the amount of information required for scroll display by the map display means is reduced, and the road data is separately determined according to the speed range. An on-vehicle navigation device characterized in that a vehicle-mounted navigation device is stored.