JP3423240B2 - In-vehicle navigation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted navigation device, and more particularly, to display a route or a road in the vicinity of the own vehicle by dynamically changing the amount of drawing data according to the own vehicle speed or the scroll speed. It is configured to ensure the.

[0002]

2. Description of the Related Art Conventionally, for example, in a vehicle-mounted navigation device described in Japanese Patent Laid-Open No. 2-219084, the number of roads drawn according to the vehicle speed is reduced to reduce the amount of drawing processing. In the in-vehicle navigation device described in Kaihei 8-219803, during scrolling,
The amount of drawing processing is reduced by displaying only routes and roads near the vehicle. As described above, in the conventional technology, the number of roads to be drawn is reduced according to the speed of the vehicle and the speed of scrolling, thereby reducing the amount of drawing processing.

However, this conventional technique has a problem that some roads are not displayed depending on the vehicle speed and the scroll speed.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned problems and allows the amount of drawing data to be dynamically changed according to the speed of the vehicle and the scroll speed, so that at least the route and the vehicle can be changed. It is an object of the present invention to provide a vehicle-mounted navigation device that can secure display of nearby roads.

[0005]

The in-vehicle navigation system according to the present invention comprises means for increasing or decreasing the amount of drawing according to the amount of data, and increasing or decreasing the amount of drawing of roads or names when the vehicle is moved or scrolled. Is characterized by.

As described above, since the drawing data amount is dynamically changed according to the vehicle speed and the scroll speed,
At a minimum, the route and roads near the vehicle can be displayed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
Display data amount selection means for calculating a drawing amount based on the table, which has a table in which information on whether to draw or not to draw according to the previous drawing time is stored in association with the type of road or name to be drawn; Control means for dynamically increasing or decreasing the type of road or name to be drawn according to the speed of the vehicle or scroll speed when moving or scrolling the vehicle and the drawing amount calculated by the display data amount calculating means The vehicle-mounted navigation device is characterized by including the following, and has an effect that the drawing data amount can be dynamically changed according to the vehicle speed and the scroll speed.

[0008] The invention according to claim 2 of the present invention, vehicle prior SL control means of the current by calculating the amount of time drawn by drawing time that includes a writing time calculation means and characterized by claim 1, wherein This is a navigation device, and has an effect that the amount of drawing data can be dynamically changed according to the speed of the vehicle and the scroll speed.

[0009]

The invention according to claim 3 of the present invention is characterized in that the display data amount calculating means has a different table for judging increase / decrease according to the scale of the map data. This is an in-vehicle navigation device, and has an effect that the drawing data amount can be dynamically changed according to the scale of map data.

The invention according to claim 4 of the present invention is characterized in that the display data amount calculation means has a plurality of the tables according to a difference in scrolling speed. This is a vehicle-mounted navigation device, and has an effect that the drawing data amount can be dynamically changed according to the scroll speed.

[0012] The invention of claim 5, wherein the present invention, when the route is set, according to any one of claims 1 to 4, characterized in that continuously displayed without deleting the route The vehicle-mounted navigation device has the function of ensuring the display of the route at a minimum.

According to a sixth aspect of the present invention, the control means, in accordance with the vehicle speed or the scroll speed and the drawing amount calculated by the display data amount selection means when the vehicle is moved or scrolled, In addition to dynamically increasing or decreasing the types of roads and names to be drawn, if it is determined that the drawing amount needs to be reduced, the reduction is executed each time the drawing is performed, and it is determined that the drawing amount needs to be increased. In some cases, the increment is performed after drawing several times.
The vehicle-mounted navigation device according to claim 5 , wherein the drawing data amount can be dynamically changed according to the vehicle speed or the scroll speed, and the drawing amount is increased, There is an effect that it is possible to prevent the flickering of the screen at the time of drawing by increasing the hysteresis after seeing it.

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a diagram showing a configuration of a vehicle-mounted navigation device according to a first embodiment of the present invention. In FIG. 1, the in-vehicle navigation device is
Basically, an operation means 10 such as a remote controller, a control means 20 for dynamically changing the drawing processing amount, and a GPS
Position calculating means 30 for receiving position information such as satellites and calculating position, and display data amount selecting means 40 having a table format
And a map information storing means 60 for storing map data in a CD-ROM or the like, and a display means 50 for displaying according to the display data amount determined by the control means. Then, the control means 20 in the first embodiment is
A data amount calculation means 21 is provided to increase or decrease the amount of drawing according to the amount of data.

The operation of the first embodiment of the present invention will be described based on the flow chart shown in FIG. In the first embodiment, the drawing amount is determined by the data size of one unit read. In FIG. 2, with the start of the flow, first, at step (indicated as St. in the figure. The same applies hereinafter) 71, the map information is read. Next, at step 72, the data amount calculation means 21 calculates the data amount (α) of one unit. In step 73, the display data amount selection means 40 is used to determine the above-mentioned data amount (α).
Based on, the drawing amount is calculated from the table.

This will be described with reference to FIG. Figure 3
Shows an example of a table provided in the display data amount selection means 40. In FIG. 3, as display items, roads that are divided into highways, prefectural roads, municipal roads, and narrow streets and are displayed according to the amount of data, and names that are displayed according to the amount of data such as place names and facility names are in a table. Is output as the index result of. That is, the contents of the road and the name to be displayed are passed to the control means 20 according to whether or not the above-mentioned data amount (α) exceeds the data amount divided by the threshold values B1 and B2. The background displayed on the display means 50 is designed so as not to disappear from the display under any circumstances. In addition, if the map data is of a wide area, more of it is not drawn than the narrow area. For example, if a prefectural road is drawn on a map of 1 / 10,000, the prefectural road is not drawn on a map of 1 / 20,000.

In FIG. 3, the scroll speed is not particularly mentioned as a parameter, but if a plurality of such tables are prepared according to the difference in scroll speed, the control means 20 described above for the scroll speed can be used. By sensing, an appropriate table corresponding to the scroll speed can be accessed when accessing the display data amount selection means 40.

Finally, in step 74, drawing is performed based on the calculated drawing amount. Then, the flow ends.

As described above, in the first embodiment of the present invention, since the means for increasing / decreasing the amount of drawing according to the amount of data is provided, the amount of drawing the road or name is increased / decreased when the vehicle is moved or scrolled. It becomes possible.

When the amount of drawing is increased or decreased according to the amount of data, the amount of data was calculated in consideration of the data size of one unit read in step 72.
Other than that, (a) Consider the data size of the total unit read, (b) Consider the data size of the unit previously read, (c) Consider the data size of the unit read several times including the previous time. The data amount may be calculated in this way (taking an average).

(Second Embodiment) FIG. 4 is a diagram showing the structure of a vehicle-mounted navigation device according to a second embodiment of the present invention. The in-vehicle navigation device in FIG.
Basically, an operation means 10 such as a remote controller, a control means 20 for dynamically changing the drawing processing amount, and a GPS
Position calculating means 30 for receiving position information such as satellites and calculating position, and display data amount selecting means 40 having a table format
And a map information storing means 60 for storing map data in a CD-ROM or the like, and a display means 50 for displaying according to the display data amount determined by the control means. Then, the control means 20 in the second embodiment is
A drawing time calculation means 22 for increasing / decreasing the drawing amount according to the drawing time is provided.

The operation of the second embodiment of the present invention will be described based on the flow chart shown in FIG. In the second embodiment, the drawing time is calculated to determine the drawing amount. In FIG. 5, with the start of the flow, first, in step 81, map information is read. Next, at step 82, the drawing amount is calculated from the table based on the previous drawing time T.

This will be described with reference to FIG. Figure 6
Shows an example of a table provided in the display data amount selection means 40. In FIG. 6, as display items, roads classified into expressways, prefectural roads, municipal roads and narrow streets and displayed according to drawing time, and names displayed according to drawing time such as place names and facility names are shown in a table. Is output as the index result of. That is, the contents of roads and names to be displayed are passed to the control means 20 depending on whether or not the drawing time T exceeds the drawing time divided by the thresholds C1 and C2. The background displayed on the display means 50 is designed so as not to disappear from the display under any circumstances. In addition, if the map data is of a wide area, more of it is not drawn than the narrow area. For example, 1
If the prefectural road is drawn on the map of 1 / 10,000, the prefectural road is not drawn on the map of 1 / 20,000.

In FIG. 6, the scroll speed is not specifically mentioned as a parameter, but if a plurality of such tables are prepared according to the difference in scroll speed, the control means 20 for the scroll speed described above can be used. By sensing, an appropriate table corresponding to the scroll speed can be accessed when accessing the display data amount selection means 40.

Next, at step 83, drawing is performed based on the calculated drawing amount. Then, in step 84, the current drawing time is calculated. This drawing time is the drawing time T for indexing the next table. Finally, the flow ends.

As described above, in the second embodiment of the present invention, since the means for increasing / decreasing the drawing amount according to the drawing time is provided, the drawing amount of the road or the name is increased / decreased when the vehicle is moved or scrolled. It becomes possible.

When the drawing amount is increased or decreased according to the drawing time, the previously read 1
The drawing amount was calculated in consideration of the drawing time for the unit, but in addition to that, (a) the drawing time for the read total unit is considered, and (b) the drawing time for the unit read several times including the previous time. The drawing amount may be calculated in this way by considering (taking an average).

(Third Embodiment) FIG. 7 is a diagram showing the structure of an on-vehicle navigation device according to a third embodiment of the present invention. In FIG. 7, the in-vehicle navigation device is
Basically, an operation means 10 such as a remote controller, a control means 20 for dynamically changing the drawing processing amount, and a GPS
Position calculating means 30 for receiving position information such as satellites and calculating position, and display data amount selecting means 40 having a table format
And a map information storing means 60 for storing map data in a CD-ROM or the like, and a display means 50 for displaying according to the display data amount determined by the control means. Then, the control means 20 in the third embodiment is
A reading number calculating means 23 is provided to increase or decrease the amount of drawing according to the number of units for reading the CD, that is, the number of reading.

The flowchart for explaining the operation of the third embodiment of the present invention is almost the same as that of FIGS. 2 and 3 for explaining the operation of the first embodiment. However, the difference is that the process of calculating the number of readings is executed instead of calculating the amount of data.

As described above, in the third embodiment of the present invention, the CD
Since the means for increasing or decreasing the amount of drawing is provided according to the number of units to be read, it is possible to increase or decrease the amount of drawing of roads or names when the vehicle is moved or scrolled.

If the location is, for example, a rural area, the units are integrated when the map data is loaded from the CD, so the number of units to read the CD is small, and conversely the location is in the city. In some cases, since the number of units is increased when the map data is taken from the CD, the number of CD-reading units is large, and therefore the drawing amount can be increased or decreased depending on the number of CD-reading units.

(Fourth Embodiment) FIG. 8 is a diagram showing the structure of a vehicle-mounted navigation device according to a fourth embodiment of the present invention. In FIG. 8, the in-vehicle navigation device is
Basically, an operation means 10 such as a remote controller, a control means 20 for dynamically changing the drawing processing amount, and a GPS
Position calculating means 30 for receiving position information such as satellites and calculating position, and display data amount selecting means 40 having a table format
And a map information storing means 60 for storing map data in a CD-ROM or the like, and a display means 50 for displaying according to the display data amount determined by the control means. Then, the control means 20 in the fourth embodiment is
The previous time information holding means 24 and the drawing time calculation means 25 for increasing or decreasing the drawing amount according to the drawing time are provided.

The operation of the fourth embodiment will be described with reference to the flow chart shown in FIG. In FIG. 9, with the start of the flow, first, in step 91, map information is read. Next, at step 92, the information of the previous drawing is read. In step 93, it is determined whether the drawing amount has been increased in the previous drawing. If it is determined that the drawing amount has been increased, the process proceeds to step 94 and the same drawing amount as the previous time is calculated. Then, it proceeds to step 96. If it is determined that the drawing amount has not been increased, the process proceeds to step 95, and the drawing amount is calculated from the table based on the previous drawing time T.
Then, it proceeds to step 96.

In step 96, drawing is performed by the method selected in step 94 or step 95. Finally, in step 97, the current drawing time is calculated and stored as the next drawing time T. Then, the flow ends.

As described above, in the fourth embodiment of the present invention, the drawing amount is basically determined by the drawing time (previous drawing time) for the total unit read last time, but The effect that it is possible to prevent the flickering of the screen at the time of drawing by determining whether the drawing amount has been increased at the previous drawing, and if the drawing amount has been increased last time, draw with the same drawing amount as the previous drawing Is played.

[0037]

As described above, since the vehicle-mounted navigation device of the present invention can dynamically change the drawing processing amount,
It has an effect that an optimal map display can be performed according to the amount of data and the scroll speed.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining a vehicle-mounted navigation device according to a first embodiment of the present invention,

FIG. 2 is a flowchart for explaining the operation of the first embodiment of the present invention,

FIG. 3 is an example of a table provided in display data amount selection means for explaining the operation of the first embodiment of the present invention,

FIG. 4 is a block diagram for explaining an in-vehicle navigation device according to a second embodiment of the present invention,

FIG. 5 is a flowchart for explaining the operation of the second embodiment of the present invention,

FIG. 6 is an example of a table provided in display data amount selection means for explaining the operation of the second embodiment of the present invention,

FIG. 7 is a block diagram for explaining an in-vehicle navigation device according to a third embodiment of the present invention,

FIG. 8 is a block diagram for explaining an in-vehicle navigation device according to a fourth embodiment of the present invention,

FIG. 9 is a flowchart for explaining the operation of the fourth exemplary embodiment of the present invention.

[Explanation of symbols]

10 means of operation 20 Control means 21 Data volume calculation means 22, 25 Drawing time calculation means 23 Read count calculation method 24 Last time information retention method 30 Position calculation means 40 Display data amount selection means 50 display means 60 Map information storage means

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Claims (6)

(57) [Claims] 1. A display having a table in which information on whether to draw or not draw according to the previous drawing time is stored in association with the type of road or name to be drawn, and a drawing amount is calculated based on the table. Data amount selection means, dynamically increases or decreases the type of road or name to be drawn according to the vehicle speed or scroll speed when moving or scrolling the vehicle and the drawing amount calculated by the display data amount calculating means. An in-vehicle navigation device, comprising: 2. The vehicle-mounted navigation device according to claim 1, further comprising drawing time calculation means for calculating a drawing time by the control means and setting it as a current drawing time. 3. The vehicle-mounted navigation device according to claim 1 or 2, wherein the display data amount calculation means has a different table for determining increase / decrease depending on the scale of the map data. 4. The in-vehicle navigation device according to claim 1, wherein the display data amount calculation means has a plurality of the tables according to a difference in scrolling speed. When 5. A path is set, the vehicle navigation system according to any one of claims 1 to 4, characterized in that continuously displayed without deleting the route. 6. The control means determines the type of road or name to be drawn in accordance with the vehicle speed or scroll speed when moving or scrolling the vehicle and the drawing amount calculated by the display data amount selecting means. In addition to dynamically increasing and decreasing, if it is determined that the drawing amount needs to be reduced, the reduction is executed every time drawing is performed, and if it is determined that the drawing amount needs to be increased, after several times of drawing The vehicle-mounted navigation device according to any one of claims 1 to 5 , wherein the vehicle-mounted navigation device executes an increase.