JPH08285620A - Car navigation equipment - Google Patents

Abstract

PURPOSE: To display the position of a final target in detail even if it is a small building or a private house by adding a residential map data base to a road map database and switching over between the road map and the residential map. CONSTITUTION: A map data base 6 in which a residential map is stored with CD-ROMs and IC cards is added to a car navigation device, and a map to be displayed 5 is switched over from a road map to the residential map and vice versa by an operating device 3. Also, when it is so structured that an automatic switchover mode can be selected, the road map and residential map can be switched over automatically. With this constitution, a distance from a car position to a target position comes within a specified distance and, when it reaches a distance at which the final target position must be retrieved, the map display is switched over from the road map to the housing map automatically or by the operation the operation of the operation device 3. By this, a navigation is made with the residential map. When the position is apart by a specified distance or longer from the target position, the map display is switched over automatically to the road map.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car navigation system, and more specifically, it displays a map of the surroundings of a running vehicle by superimposing its own position and setting a destination to set the destination from the own vehicle's position. The present invention relates to a car navigation device that calculates and displays a route to the ground.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing an outline of a device configuration for explaining a conventional car navigation device. In FIG. 4, reference numeral 1 is a positioning system composed of a combination of a GPS, a vehicle speed sensor, a direction sensor and the like. A device 2, a road map database in which a road map is stored in a CD-ROM or the like, and 3 is an operating device, which is constituted by, for example, a remote controller or the like, and inputs a destination setting and various operation commands. Reference numeral 4 denotes a display control device, which searches the road map database 2 for a road map around the position based on the vehicle position obtained from the positioning device 1 and superimposes the vehicle position on the searched road map to display image data (navigation / Data), or further extract information such as the route to the destination obtained from the own vehicle position,
Navigation information is created by superimposing this route and other information on the road map. Reference numeral 5 denotes a display device for displaying navigation data, which is composed of a CRT, LCD or the like.

Although the car navigation device shown in FIG. 4 is well known, the position of the vehicle is measured by using a positioning device 1 such as satellite navigation utilizing GPS or dead reckoning navigation utilizing direction and vehicle speed sensor, After changing the position to the coordinate position on the road map database, the road map including the action range of the vehicle is taken out from the road map database 2, and the own vehicle position is superimposed on the map and displayed on the display device 5. .

By setting the destination on the map with the operation device 3, the route from the vehicle position to the destination is extracted and displayed on the display device 5 in a superimposed manner on the map. Therefore, the driver can obtain navigation information such as where he / she is currently driving, where he / she should go to reach the destination, or where he / she should turn, by the display of the display device 5. it can.

The road map database 2 generally stores map information of several stages from simple to detailed, but the stored map is basically a road map, Rivers, railways, facilities, names, etc. are added to the 1/25 thousand road map.
Therefore, even in the most detailed level of map data, the shape of the section and the detailed house name are not displayed (see Fig. 3). When setting a destination, set it according to the latitude and longitude of the destination, unless the destination is a special place registered in the road map data, for example, ΔΔ city X
It will be set with a rough address such as X ward.

[0006]

As described above, in the conventional car navigation device, since the stored map is basically a road map, for example, when the destination is a small building or a private house, The building or house is not displayed on the displayed map, and the building or house itself cannot be set even when setting the destination. Therefore, when approaching near the destination, the driver must search for the building or house, but this work is not easy because the building name needs to be read from the road on which the driver is driving, and the building is particularly complicated. There was a problem that it becomes difficult in the urban area and at night.

The present invention has been made in order to solve such a problem, and even if the place to be displayed or the destination is a small building or private house, the place itself can be displayed and the car itself can be set. It is intended to provide a navigation device.

[0008]

A car navigation system according to the present invention comprises a residential map database as a map database in addition to a conventional road map database,
It is characterized in that it can be appropriately switched and navigated.

Further, it is characterized in that a means for automatically switching from road map display to residential map display is added when a vehicle nears a destination according to a designated operation mode.

Further, since the residential map has a large amount of data because it is displayed in detail, it is characterized by adopting a cassette exchange system for each specific area.

[0011]

For example, a positioning device such as GPS can currently measure the difference in position within 2 m, and the positioning device itself can discriminate to some extent even in a small building or a private house. Since I didn't have a residential map, I couldn't set or display a small building or a private home as a destination. The present invention solves the above problem by adding a residential map database. Also, since it is generally possible to limit the need to use a residential map near the destination,
When the device itself approaches the destination, the positioning device judges this and automatically switches to the residential map. Further, since it can be limited to the vicinity of the destination, the problem of storing a housing map database that requires a large amount of information by storing only the housing map near the destination by the cassette exchange method before departure is solved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the device configuration of a car navigation device of the present invention. In FIG.
The same reference numerals as those in FIG. 4 indicate the same or corresponding parts, and 6 is a house map database in which a house map is stored in a CD-ROM, an IC card or the like. Generally, a residential map needs to be displayed in more detail than a road map, so the amount of data is large, and the required residential map is generally limited to the area around the destination. The system may be used, and only the residential map database of the area around the destination may be set in the device at the time of departure.

The operation device 3 and the display control device 4 are also provided.
Is configured almost the same as the conventional device shown in FIG. 4, but the map displayed on the display device 5 is switched from the road map display to the residential map display by operating the operating device 3 and vice versa. It is configured to be able to. further,
If the automatic switching mode is selected, the road map display and the residential map display can be automatically switched by the operation described later.

FIG. 2 is a flow chart for explaining automatic switching between road map display and residential map display. That is, as described above, in the car navigation device, the position of the vehicle can be constantly measured by the positioning device 1, and the distance to the destination can be constantly measured. Therefore, the distance from the vehicle position to the destination is within the specified distance. When it is no longer necessary, that is, the navigation by road map is not necessary anymore, and when it approaches the distance where the final destination needs to be searched, the operation shown in Fig. 2 automatically switches to the residential map and the navigation on the residential map is performed. To do. Needless to say, when the position of the vehicle on the return trip is more than the specified distance from the destination, the navigation automatically switches from the residential map to the road map navigation.

FIG. 3 shows a state in which the navigation map display state is switched from the road map navigation state to the residential map navigation display state. In the navigation using the residential map, we are already near the destination, so
The display of the route can be omitted as shown in FIG.

[0016]

As described above, the car navigation system of the present invention switches from road map navigation to home map navigation when approaching a destination, so that the final destination is a small building or private residence. Even in such cases, the device can be used to navigate to the final destination in the car day and night regardless of the weather.
Further, by using the residential map database, there is an effect that the destination can be set in detail.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a device configuration of the present invention.

FIG. 2 is a flowchart for explaining automatic switching between road map display and residential map display.

FIG. 3 is a diagram showing a state in which a navigation map display state is switched from a road map navigation state to a residential map navigation display state.

FIG. 4 is a block diagram showing an example of a device configuration of a conventional car navigation device.

[Explanation of symbols]

 1 Positioning Device 2 Road Map Database 3 Operating Device 4 Display Control Device 5 Display Device 6 Residential Map Database

Claims (3)

[Claims] 1. A car navigation device that has at least a road map database, a positioning device, a control device, and a display device, and displays a road map around the vehicle position on the display device while navigating to a destination set by a driver. In addition, in addition to the road map database, a house map database is added, and the car navigation device is provided with means for navigating to a destination set by a driver while switching the road map and the house map. 2. The switching between the road map and the residential map is automatically performed by the control device according to the difference in the distance between the vehicle position measured by the positioning device and the set destination. The car navigation device according to item 1. 3. The car navigation system according to claim 1, wherein the housing map database is of a cassette exchange system for each specific area.