JPH05216400A - Map display device for vehicle - Google Patents

Abstract

PURPOSE:To provide a vehicle map display device which judges the availability of altered map information such as a newly constructed road expected to be opened at its utilization point of time and displays the information. CONSTITUTION:A CD-ROM 2 stores alteration schedule map information together with map information, and also stores the alteration schedule data for the altered map information. This device is provided with a display unit 5 which displays a map and a calendar circuit 10 which counts the present time and years, months, and days. In the case of displaying the map on the display unit 5 a microcomputer 1 compares the present data indicated by the calendar circuit 10 with the alteration schedule data of the altered map information stored on the CD-ROM 2 and displays the altered map information on the map when the present data is later than the alteration schedule data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle map display device for storing map information of a region where a vehicle travels in advance in a storage means and displaying a map based on the map information on a display means installed in the vehicle. Regarding

[0002]

2. Description of the Related Art Map information is stored in advance in a storage means such as a CD-ROM and the current position of the vehicle is detected by the position detection means while a map of the area around the vehicle is displayed on an in-vehicle display. At the same time, a vehicle map display device for displaying the current position of the vehicle on the map is known (for example,
See Japanese Patent Application Laid-Open No. 1-217210, etc.).

[0003]

However, in the conventional map display device of this type, for example, a new road which is scheduled to be newly opened is not displayed or is displayed by a virtual line. Information on the opening date was never displayed. For this reason, at some point in driving a car, for example, even if a new road is already open, the driver cannot confirm the opening of the new road on the display screen. When selecting, there was a problem that the width of the road selection was narrowed.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to display the changed map information of a new road or the like which is scheduled to be opened by judging the effectiveness at the time of use. An object is to provide a map display device for a vehicle.

[0005]

To this end, the vehicle map display device of the present invention, as shown in the configuration diagram of FIG. 3, displays map information storage means for storing map information in advance and the current position of the vehicle. A map display device for a vehicle, comprising: a current position recognition unit for recognizing; and a display unit for displaying the current position of the vehicle recognized by the current position recognition unit on a map based on the map information. The scheduled change date for the change map information in the map information is stored in, and the current time indicated by the calendar time measuring means for displaying the map on the display means and the calendar time measuring means for outputting the current date. The date is compared with the scheduled change date of the changed map information stored in the map information storage means, and if the current date is after the scheduled change date, the changed map information is displayed on the map. Configured and a display control unit.

[0006]

In the vehicle map display device having the above-described structure, the display means reads the map near the current position of the vehicle from the map information storage means and displays it on the display. Then, the current position recognition means recognizes the current position of the vehicle,
Its current position is displayed on the map.

When the displayed map contains changed map information such as a new road to be opened, the map display control means stores the current date indicated by the calendar timing means and the map information storage means. The planned change dates of the changed map information thus obtained are compared, and if the current date is after the planned change date, the changed map information, for example, the new road is displayed on the map as a usable road.

Therefore, when the map information of the map display device is stored in the storage means, for example, even if the road is planned to be opened, there is a road already opened when the vehicle is traveling. , The new road is displayed as an open road on the displayed map, so the driver
The effectiveness of the road can be easily recognized and the road can be driven if necessary.

[0009]

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

FIG. 1 shows a block diagram of a vehicle map display device. This map display device is configured with a microcomputer 1 as a main part, and displays a map around the current position of the vehicle, which will be described later, based on program data stored in advance in ROM, with modified map information added, and , Calculates the current position of the vehicle based on the azimuth data and the mileage data of the vehicle, and displays the current position on the map.

Reference numeral 2 is a CD-RO as a map information storage means.
A map of an area in which the vehicle can travel is divided into various scales and appropriate ranges, and is written as map information. In addition to the normal map information, the CD-ROM 2 also stores changed map information to be changed, such as new roads and highway interchanges planned to be constructed in the future, facilities planned to be constructed or abolished. Scheduled dates of change (including time in some cases) such as opening dates and abolition dates are stored for the changed map information.

Reference numeral 3 denotes a CD drive for driving the CD-ROM 2 to read out map information. The CD drive 3 is connected to the input / output circuit of the microcomputer 1 via the decoder 4 and sends the read map information to the microcomputer 1.

A CD-R is used as the map information storage means.
Besides the OM, an IC card, an optical disk, etc. can be used.

Reference numeral 5 denotes a display device such as a CRT which is installed in the vehicle compartment and displays the above map, and is connected to a display controller 6 which controls the display. The display controller 6 is connected to the input / output circuit of the microcomputer 1 and stores the image data sent from the microcomputer 1 in the image memory 7
Then, the map including the current position of the vehicle is displayed on the display unit 5.

Further, 8 is a geomagnetic sensor attached to the vehicle body, which detects the geomagnetic field across the vehicle body and sends the signal to the microcomputer 1. 9 is a vehicle speed sensor attached to the vehicle, which detects the rotational speed of the driven wheels of the vehicle,
The detection signal is sent to the microcomputer 1. The microcomputer 1 calculates the traveling distance of the vehicle based on the vehicle speed signal from the vehicle speed sensor 9, and calculates the traveling direction based on the geomagnetism detected by the geomagnetic sensor 8 every time the vehicle travels the unit traveling distance. Then, by repeating the traveling distance and traveling direction calculation processing from the reference position, the current position of the vehicle is calculated and displayed on the map of the display.

Therefore, the above-mentioned present position recognizing means is composed of the microcomputer 1, the geomagnetic sensor 8 and the vehicle speed sensor 9, and the GPS for receiving the positioning radio wave from the artificial satellite and determining the receiving position, or A device such as a gyro compass can be used as the position detecting means.

Reference numeral 10 is a calendar circuit that constantly counts clock signals to measure time and date. The calendar circuit 10 is connected to the input / output circuit of the microcomputer 1. The calendar function may be incorporated in the microcomputer 1 instead of the external circuit.

Next, the operation of the vehicle map display device having the above configuration will be described with reference to the flowchart of FIG.

For example, when the vehicle starts traveling from the stopped state, its position is calculated during the previous traveling and is stored in the RAM as the stopped position.
The CD drive 3 is driven to read the map information around the current position of the vehicle from the CD-ROM 2 and temporarily store it in the RAM (step 100).

Next, the CPU of the microcomputer 1
At step 110, it is determined whether or not the read map information includes changed map information such as roads to be opened, roads to be abolished, and interchanges to be newly established. In step 120, if there is no changed map information, then step 140 is performed.

In step 120, the calendar circuit 10
Current date sent by (may include time)
And the planned change date (including the time in some cases) attached to the changed map information are compared, and if the current date is after the planned change date, the process proceeds to step 130 and the current date is planned to be changed. If it is before the day, go to step 140.

Then, in step 130, the CPU sends the image data obtained by adding the changed map information (new roads or interchanges already opened) to the map information to be displayed to the display controller 6, and the display device 5 To display the map.

On the other hand, in step 140, the map information in the state where there is no changed map information or the state where it is not changed is sent to the display controller 6 and the map is displayed on the display unit 5.

Next, the CPU of the microcomputer 1
Calculates the traveling distance of the vehicle based on the vehicle speed signal from the vehicle speed sensor 9 in step 150, and calculates the traveling direction based on the geomagnetism detected by the geomagnetic sensor 8 every time the vehicle travels the unit traveling distance. To do. Furthermore, by repeating the travel distance and travel direction calculation processing from the reference position,
Calculate the current position of the vehicle. And step 160
Then, the current position of the vehicle is displayed on the map of the display unit 5.

As described above, when there is changed map information in the displayed map, the scheduled change date and the current date are compared, and when the current date is after the scheduled change date, the map information is the CD. -When it is written in ROM2, even roads and interchanges that are planned to be built will be displayed as already open roads and interchanges, and the driver can easily recognize the effectiveness of the new roads and interchanges from the map. You can do that, and if you want, you can choose to go through that road or interchange.

In step 160, when the current position of the vehicle is corrected by the so-called map matching method, when the calculated current position of the vehicle is off the road, the vehicle is traveling. A correction process is performed so that an estimated nearby road is designated on the map and the current position is corrected on that road.

When the current position of the vehicle is corrected by such a map matching method, as to the map having the map information to be changed, it is judged whether the change is completed at the time of use and the change is completed as described above. If so, the corrected map information is used to correct the current position by map matching. Therefore, for example, when a vehicle travels on a new road or a new interchange, the changed map information can be used to accurately correct the current position of the vehicle and display the current position without error. It can be performed.

[0028]

As described above, according to the vehicular map display device of the present invention, the map display control means has the current date indicated by the calendar timing means and the changed map stored in the map information storage means. If the current date is after the scheduled change date, even if the changed map information has not been changed at the time of being stored in the storage means, for example, a new road or a new interchange will be displayed. As the roads and facilities that can be used are displayed on the map as the changed roads and facilities, the driver of the vehicle can easily recognize the effectiveness of the roads and accurately determine the state of the roads and facilities. You can grasp and drive.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing the operation of the same device.

FIG. 3 is an overall configuration diagram of the present invention.

[Explanation of symbols]

1-microcomputer, 2-CD-ROM, 5-display, 8-geomagnetic sensor, 9-vehicle speed sensor, 10-calendar circuit.

Claims (1)

[Claims] 1. A map information storage means for storing map information in advance, and a current position recognition means for recognizing the current position of the vehicle.
A vehicle map display device comprising: a display unit for displaying the current position of the vehicle recognized by the current position recognition unit on a map based on the map information; The scheduled change date is stored for the changed map information of the change schedule, and the calendar date and time means for outputting the current date, and the current date and time indicated by the calendar time means for displaying the map on the display means are displayed. Map display control means for comparing the planned change dates of the changed map information stored in the map information storage means and controlling the changed map information to be displayed on the map if the current date is after the planned change date. And a map display device for a vehicle, comprising: