JPH01314914A - Car-loaded navigation device - Google Patents

Abstract

PURPOSE:To perform map matching and indicate an arbitrary area on an electronic map at all times by providing a map data memory unit for detecting the present position and another map data memory unit for drawing a map independently from each other. CONSTITUTION:A present position detecting device 4 performs map matching between a present position newly calculated on the basis of data from a sensor unit 1 and road data obtained from a map data memory unit 21 for detecting a present position, thereby finally determining the present position which is then delivered to a picture drawing device 5. The device 5 reads data for draw ing a map of the neighborhood of the determined present position of a motor car from a map data memory unit 22 which stores data for drawing a map, to indicate the data in the form of a map on a display device 6. At this time, a position mark indicating the position of the car is overlappingly displayed. Moreover, the device 5 can read out a map of an arbitrary area from the mem ory unit 22 by an input from an operating device 3 irrespective of the position of the car, and display the same.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-vehicle navigation device that is mounted on a vehicle and guides an occupant by displaying the current location of the vehicle on an electronic map.

[Conventional technology]

As a conventional vehicle-mounted navigation device, for example, the one disclosed in Japanese Patent Laid-Open No. 61-56910 is known. Second
The figure is a block diagram showing an example of the configuration of a conventional in-vehicle navigation system. It also has a direction sensor 12 that detects the direction in which the vehicle is traveling.

Reference numeral 2 denotes a map data storage device, which stores at least a group of road data necessary for detecting the current position of a vehicle, which will be described later, and a group of drawing data necessary for displaying a map. Also,
These storage media include floppy disks, tape cassettes, optical disks, and the like.

Reference numeral 3 denotes an operating device, which performs operations for inputting a departure point and calling up map information of a predetermined area.

4 is a current position detection device that calculates a new current position based on the movement information from the resensor device 1, compares the current position with the road data read from the data storage device 2, and detects an error within a predetermined value. If the current position is within the range, the current position determined by calculation is added to the road data. This process is called map matching, and is performed to prevent the accumulation of errors in sensor signals.

Reference numeral 5 denotes a drawing device, which reads out drawing data necessary for an electronic map such as road data, rivers, railways, character data, etc. from the map data storage device 2, performs drawing processing, and displays the map on the display device 6.

At this time, by superimposing and displaying the current position sent from the current position detection device 4 on the electronic map, the occupant can recognize the vehicle position on the map.

Furthermore, if a request is made to display a map of a desired area from the operating device 3, the drawing device 5 also has a function of reading drawing data for the corresponding area from the map data storage device 2 and displaying it on the display device 6.

That is, the map data storage device 2 is the current position detection device 4.
The configuration is such that it can be accessed from both the computer and the drawing device 5.

[Problem to be solved by the invention]

Since the conventional in-vehicle navigation device is configured as described above, when the current position detection device 4 and the drawing device 5 try to read map data of different areas at the same time, one of them is forced to wait and the map matching process is delayed. There are disadvantages such as being disabled or displaying the map delayed.

That is, for example, this problem occurs when the passenger wishes to see a map of the Kanto region while traveling in the Kansai region using map matching.

The current position detection device 4 adds the travel distance obtained from the information from the sensor device 1 to the previous current position as a base point, and requires road data near this position for verification processing, but the map data storage device 2 is being accessed from the rendering device M5 to read a completely distant area,
If timely map matching becomes impossible and the vehicle travels and moves further, the current position detection device 4 will lose track of the current position on the map road.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide an on-vehicle navigation device that is always capable of map matching processing and display of an electronic map of an arbitrary area.

[Means to solve the problem]

The in-vehicle navigation device according to the present invention includes a current position detection map data storage device dedicated to current position detection processing and a TI image map data storage device dedicated to map drawing processing.

[For production]

In this invention, the current position detection map data storage device is accessed only from the current position detection device, and the drawing map data storage device is accessed only from the drawing device, and current position detection processing and map drawing processing are performed independently of each other without any hindrance. I do.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, reference numeral 21 denotes a map data storage device for detecting the current position, which is connected to the current position detecting device 4. Reference numeral 22 denotes a drawing map data storage device, which is connected to the drawing device 5.

The other blocks have the same numbers as in the conventional example shown in FIG. 2 and have the same functions.

Next, the operation will be explained. The current position detection device 4 performs map matching processing on the new current position calculated based on the information from the sensor device 1 and the road data obtained from the current position detection map data storage device 21 to determine the final current position. , and passes the position to the drawing device 5.

The drawing device M5 reads data for drawing a map in the vicinity from the TI image map data storage device 22 based on the vehicle position, performs drawing processing, and displays the map on the display device 6. At this time, the vehicle position mark is also displayed in an overlapping manner.

Further, the drawing device 5 is operated by the operator 173 regardless of the position of the vehicle.
It is also possible to read a map of an arbitrary area from the drawing map data storage device 22 and display it by inputting an input operation such as 'l 3 /I.

That is, the current position detection device 4 reads road data necessary for map notching from the current position detection map data storage device 21, while the drawing device 5 reads map drawing data necessary for map display. Data storage device 22
It is configured to be read from.

As described above, according to the present invention, the current position detection map data storage device 21 and the drawing map data storage device 22
Since these are provided independently, processing of each can be performed independently of the other, and processing such as displaying a map of another area during map matching processing can be performed without any problem.

Furthermore, the current position detection map data storage device 21 and the drawing map data storage device 22 may be exactly the same, but may be different.

That is, the map data required for map matching processing basically only needs to be road data, while the data required for drawing requires place name characters, river, and railway data in addition to road data.

Furthermore, the storage format of road data desirable for map masoching may be different from the storage format of road data desirable for drawing processing.

In such a case, the current position detection map data storage device 21 and the drawing map data storage device 22 may store data items necessary for each process in a desired format.

Moreover, the current position detection map data storage device 21 basically only needs to store road data, and therefore, the storage capacity can be small.

In such a case, a semiconductor memory such as a ROM can also be used. On the other hand, since the drawing map data storage device 22 has a relatively large storage capacity, a large-capacity memory such as a CD-ROM or a single disk device is applied.

〔Effect of the invention〕

As described above, according to the present invention, since the current position detection map data storage device for current position detection processing and the drawing map data storage device for map drawing processing are each independently provided, This has the effect that the current position detection process and the map drawing process can be performed independently of each other without any problems, and that the current position detection accuracy and the degree of freedom in map display can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an in-vehicle navigation device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional in-vehicle navigation device. ■...Sensor device, 3...Operation device, 4...Current position detection device, 5...Drawing device, 6...Display device,
21...Map data storage device for detecting current position, 22.
...Map data storage device for drawing. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A sensor device for detecting a current position that changes as the vehicle travels, a current position detection map data storage device dedicated to current position detection processing, and a current position detection map data storage device provided independently. The current position of the car is determined using a drawing map data storage device dedicated to map drawing processing, a new current position calculated based on movement information from this sensor device, and information from the current position detection map data storage device. Drawing a map based on information from a current position detection device that performs judgment processing and the map data storage device;
and a drawing device that performs processing to display the current location on a map based on information from the current location determined by the current location detection device and displays the map on a display device. Device.