JPS63265113A - Navigation apparatus for vehicle - Google Patents

Abstract

PURPOSE:To make a driver to drive a vehicle with displayed map data as references, by memorizing a plurality of maps having different amounts of data for the same area, selecting one map in correspondence with the running speed of the vehicle, and displaying the map. CONSTITUTION:In a memory device 5, a plurality of maps having different amounts of data for the same area are memorized. A control circuit 10 reads the specified map in correspondence with the vehicle speed, which is detected with a vehicle speed sensor 2, out of the memory device 5. The present position is displayed on a display 16 or stored in a video RAM 15. Therefore, the time for reading the map data in the display can be short in high speed running. Attention in the forward direction is not neglected. Thus safety during driving can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a navigation device in which a display device such as a CRT is mounted on a vehicle and map information is displayed on the CRT screen.

(Prior art) As an automobile navigation device, for example,
As disclosed in Japanese Patent No. 8-70117, a vehicle is known that displays the current location of the vehicle and a map of its surroundings on the screen of a display device to provide driving guidance.

As means for recognizing the current position of a vehicle in such a navigation device, one using a direction sensor such as a geomagnetic sensor has already been put into practical use.

That is, the vehicle speed sensor and the azimuth sensor detect the distance and azimuth of the vehicle from a certain reference point, thereby recognizing the current position of the vehicle. Furthermore, it is also being considered that the azimuth is equalized by detecting the rotation difference between the left and right wheels, the steering angle of the steering wheel, etc., without using the azimuth sensor.

It is also being considered to measure the current position of a vehicle as an absolute position using radio waves emitted from a satellite. For example, the Qlobal positioning satellite system currently under development.
It is being considered to measure the current position of a vehicle as an absolute position using GPS (hereinafter referred to as GPS).

This GPS is capable of measuring the current position of a vehicle with a positioning accuracy of approximately 30 meters based on radio waves emitted from four artificial satellites (called NAVSTAR). /A code).

In a vehicle that uses a navigation device equipped with a satellite-based positioning means that detects the current position using GPS or a current position recognition means that uses a geomagnetic sensor, etc., 1. A map of the area is displayed, and the current position detected by the W1 star positioning means is displayed on this map. Note that there is also a navigation device that does not recognize the current location and only displays desired map information on the screen of the display device.

(Problems to be Solved by the Invention) When the above navigation device is used, the display (CRT)
Since the desired map information is displayed on the screen of
By including not only road information but also various information such as gas station location information and building location information, it can be extremely convenient for drivers. However, this map information is often viewed by drivers while driving.
When the amount of map information is increased, it takes time to read this information, and in this case, it is conceivable that the driver will not pay attention to the road ahead while driving.

This is particularly noticeable while driving at high speeds.

(Means for Solving the Problems) The present invention has been made in view of the above points, and when driving at high speed, the amount of map information displayed on the display is reduced. It is an object of the present invention to solve the above-mentioned problems by enabling a person to easily read map information so as not to neglect paying attention to the road ahead. It is configured as follows. That is, in the navigation device according to the present invention, the storage means (b) stores a plurality of maps with different amounts of information for the same area, and the control device (C) stores the traveling vehicle speed detected by the vehicle speed sensor (a). Depending on the situation, one of the plurality of maps stored in the storage means (b) is selected and displayed on the display (d).In this case, if the traveling vehicle speed is high and If so, a map with less information will be displayed on the display, and if the vehicle speed is slow, a map with more information will be displayed.

(Function) When using a navigation device configured as described above, map information is displayed on the display, and the driver can read this map information and drive while referring to this information, which is very convenient. be. In this case, even if the map information is displayed for the same area, different map information will be displayed depending on the speed of the vehicle being driven. Therefore, when driving at high speed, it may be difficult to display a map with less information. A map with a large amount of information can be displayed while driving at low speeds. Therefore, the time it takes to read the map information on the display can be shortened while driving at high speeds, making it possible to avoid neglecting to pay attention to the road ahead.
Safety can be ensured. Note that while driving at low speeds, it is possible to pay sufficient attention to the road ahead even if it takes a long time to read the map information on the display, so it is possible to increase the amount of map information and provide sufficient information to the driver. can be given.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is an overall configuration diagram showing an example of a vehicle navigation device according to the present invention. This navigation device is
It has a vehicle speed sensor 2 that detects the vehicle speed, and a control device 10 that performs various signal control depending on the vehicle speed detected by the vehicle speed sensor 2. Furthermore, a storage device 5 consisting of a compact disk, ROM, etc. that stores map information, etc., and an operating device 7 that performs various key operations are connected to the control device 10 via a decoder 6 and an encoder 8, respectively. Additionally, a display 16 such as a CRT and a video RAM 15 are connected via a display control device 14. The storage device 5 stores maps and the like showing contents necessary for vehicle travel guidance such as roads and buildings, and in this case, even if the maps are for the same area, the amount of information shown on the maps may differ. Multiple maps are stored. The operating device 7 is a key switch or the like that can be operated by a driver or the like, and can change the content displayed on the display 16 in response to this operation. The control circuit 10 is composed of a microcomputer including an arithmetic circuit 12 and a ROM 11a and a RAM 11b connected thereto. Then, in this control circuit 10, a predetermined map is pulled out from the storage device 5 according to the vehicle speed detected by the vehicle speed sensor 2, and this current position is displayed on the display 16.
or stored in the video RAM 15.

Here, the map display control W by the control device @10 in this case
I operation will be explained with reference to chart 70-V in FIG. This control first reads map data such as data type, day, night, attribute, coordinate point cloud, etc. required for map display in step 21, and then proceeds to step 22, where the display scale on the CRT is It is determined whether Sd is larger than a predetermined scale S1. When Sd>3n, that is, when the scale of the map display is large, the process advances to step 25 and the fourth
A type 2 map display with a small amount of information as shown in Figure A is displayed. On the other hand, when Sd≦3n+, step 23
Then, it is determined whether the actual vehicle speed VC detected by the vehicle speed sensor 2 is greater than a predetermined vehicle speed 1, that is, whether the vehicle is traveling at high speed. When VC > Vll, the second type map is displayed, and when VC≦Vll, that is, when the vehicle is traveling at low speed, the first @ map with a large amount of information as shown in Fig. 4B is displayed. . As a result, when driving at high speed, the display t/FiI is reduced to reduce the burden on the driver to read the displayed map and ensure driving safety, while driving at low speed or low speed. When the driver has enough time to read the map information, the amount of information can be increased to provide detailed information to the driver.

Note that in the above, two types of map information are selected depending on whether the vehicle speed is greater than the predetermined vehicle speed Vn, but three or more types of map information may be stored and the map information may be selected according to changes in vehicle speed. It is a hot topic that such map information may be selectively displayed.

(Effects of the Invention) As explained above, according to the present invention, a plurality of maps having different amounts of information about the same area are stored in the storage means, and the plurality of maps stored in the storage means are stored in accordance with the traveling vehicle speed. Since the configuration is such that one of these is selected and displayed on the display, the driver can read the map information displayed on the display and drive while referring to this information. This is convenient, and in this case, even if the map information is displayed for the same area, different map information is displayed depending on the driving speed, and when driving at high speed, the map with less information may be displayed. It is possible to display a map with a large amount of information while driving at low speeds. Therefore, the time required to read the map information on the display can be short while driving at high speeds, and it is possible to prevent the vehicle from neglecting to pay attention to the road ahead, thereby ensuring driving safety. Note that while driving at low speeds, it is possible to pay sufficient attention to the road ahead even if it takes a long time to read the map information on the display, so it is possible to increase the amount of map information and provide sufficient information to the driver. can be given.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a navigation device according to the present invention; FIG. 2 is an overall configuration diagram showing an example of the navigation device; FIG. 3 is a flowchart showing a map display control operation in the navigation device; FIGS. 4A and 4B are front views showing examples of maps displayed on the CRT screen by the above control operation. 2...Vehicle speed sensor 5...Storage device 7...
Operating device 10...Control device 12...Arithmetic circuit 16...Display device Fig. 1 Fig. 3 Fig. 4A Fig. 4B

Claims (1)

[Scope of Claims] 1) A vehicle navigation device configured to display map information on an on-vehicle display, comprising: a storage means for storing a plurality of maps with different amounts of information for the same area; A navigation device for a vehicle, comprising: a control device that selects one of the plurality of maps stored in the storage means and displays the selected map on the display according to the map.