JPH076799B2 - In-vehicle navigation system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle-mounted navigation device used by being loaded on a vehicle such as an automobile.

(Prior Art) Conventionally, there is an on-vehicle navigation device to make the operation of a vehicle such as an automobile convenient, and its general configuration is to provide a display device such as a CRT on the driver's cab of the vehicle and In addition to displaying a map of the traveling area, the current position of the traveling own vehicle is moved and displayed.

(Problems to be solved by the invention) However, in the in-vehicle navigation device having the above-described conventional configuration, the CRT display performance which is practically available at present in view of reliability, size, cost, etc. It is impossible to display a map with a high definition at the level of a map book, and a map with a displayable resolution has an insufficient problem for navigation.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a vehicle-mounted navigation device capable of exhibiting a practically sufficient navigation effect without displaying a map on a display device as in the conventional case.

(Means for Solving the Problems) In order to achieve the above object, the present invention, instead of displaying the map and the current position of the vehicle on the display device, the distance between the current position of the vehicle and the destination, and the vehicle. The traveling speed at the present position of the vehicle and the direction component of the traveling speed toward the destination are displayed, and the display is performed every time the vehicle travels a certain distance.
Or, it is updated at regular time intervals, which allows the driver to know the difference between the direction in which the vehicle should proceed and the direction in which the vehicle is currently heading, and the straight line distance remaining to reach the destination. It is a thing.

That is, a direction sensor for knowing the direction of the vehicle, a distance sensor for detecting the distance traveled by the vehicle, a storage device for storing coordinate points such as latitude and longitude with respect to the position, a current location of the vehicle, a destination, etc. Input means for performing initial setting, control means for reading out predetermined storage contents of a destination and a current location from a storage device based on an instruction from the input means at the time of initial setting, and a purpose read by the control means An arithmetic means for calculating a linear distance between the destination and the current location and a destination direction component of the vehicle traveling speed based on the stored contents of the location and the current location and the output signals of the direction sensor and the distance sensor, and the linear distance. Display means for displaying the destination direction component of the vehicle traveling speed.

(Operation) Since the present invention has the above-described configuration, the driver minimizes the difference between the direction in which the vehicle should travel and the current state, and the destination traveling direction error, that is, the vehicle traveling speed and the destination direction component. By minimizing the difference between the two, it is possible to reach the destination safely and reliably.

(Examples) Hereinafter, the present invention will be described in detail with reference to the drawings by examples.

FIG. 1 is a block diagram showing the configuration of an embodiment of a vehicle-mounted navigation device of the present invention. 1 is a direction sensor for knowing the direction of the vehicle, 2 is a distance sensor for traveling the vehicle, 3 is a region name, and each region A storage device that stores a prefecture name, a municipality name for each prefecture, a town name for each municipality, and coordinate points (for example, latitude / longitude) for each town name, 4 is an initial setting of the current location of the vehicle, a destination, etc., Alternatively, it is a keyboard for instructing display switching.

Reference numeral 5 denotes a computing / controlling device, which reads out predetermined stored contents from the storage device 3 and performs display control at the time of initial setting in accordance with an instruction from the keyboard 4, and finishes initial setting of a destination and a current vehicle position. Then, the linear distance between the destination and the current position is calculated from the coordinate points such as latitude and longitude corresponding to the destination and the current position of the vehicle, and this is displayed on the display device 6. After the vehicle starts traveling, the direction and distance of movement of the vehicle are calculated for each unit of time or for each unit of traveling distance from the output signals of the direction sensor 1 and the distance sensor 2, and the destination, the current location, and the vehicle traveling speed are calculated. And a destination direction component thereof (a reduction rate of the distance between the destination and the current location).

The present invention operates as follows with the above configuration.

First, when an instruction (request) for destination setting is issued from the keyboard 4, the arithmetic / control unit 5 displays a list of each region, such as the Kanto region and the Chubu region, from the storage device 6.
To display. When the driver specifies (selects) a local name that includes the destination in the list, the prefecture name, city name, town name, and town name are sequentially displayed in the same manner below. A coordinate point of the ground, for example, latitude / longitude (X ₀ · Y ₀ ) is specified.

Next, if you instruct (select) the current location of the vehicle in the same way, the local name including the current location, the prefecture name, the municipality name, and the town name are displayed in the same way as above, and if you indicate the current location by the display, the coordinates of the current location are displayed. The point (X _N0 , Y _N0 ) is identified. the above,
Coordinate points (X ₀ · Y ₀ ), (X
_The calculation / control device 5 calculates the linear distance D from the current position to the destination from _N0 · Y _N0 ), and the display device 6 displays this. The straight line distance D is given by the following equation.

D = ^{_{[(X 0 -X N0) 2 +}} (Y 0 -Y N0) 2 ] ^1/2 Then, the signal direction sensor 1 and the distance sensor 2 starts traveling of the vehicle, from the vehicle current position determined previously A new vehicle current location (X _N · Y _N ) is calculated each time the vehicle travels for a certain period of time or a certain distance. From this, the linear distance D _N between the current location and the destination and the destination region of the vehicle traveling speed (v) are calculated. The direction component v ₀ is calculated, and the vehicle traveling speed v obtained from the speedometer of the vehicle and the destination direction component v ₀ are calculated and displayed on the display device 6. The straight line distance D _N between the current location and the destination and the destination direction component v ₀ of the vehicle traveling speed v are calculated by the following equations.

D _N = ^{_{[(X 0 -X N) 2 +}} (Y 0 -Y N) 2 ] ^1/2 v ₀ = d / dt ^{_{[(X 0 -X N) 2 +}} (Y 0 -Y N) 2 ] ^1/2 present invention, instead of displaying the current position of the map and the vehicle on the display device 6 in this way, the traveling speed v at a distance Dn, and the current position of the vehicle between the current location and destination of the vehicle
And the destination direction component v ₀ of the traveling speed is displayed,
The display is updated every time the vehicle travels a certain distance or every certain time, so that the driver can determine the difference between the direction in which the vehicle should proceed and the direction in which the vehicle is currently facing, and the remaining distance to the destination. The driver can reach the destination safely and surely by making it possible to know the straight line distance to be traveled and by minimizing the difference in the traveling direction error, that is, the difference between the traveling speed of the vehicle and its destination direction component. It will be possible.

Although the present invention has been described with reference to one embodiment, the initial setting of the destination and the current location is not limited to the method of selecting the list displayed on the display device using the keyboard of the above embodiment, and the map is displayed on the display device. However, it goes without saying that a method such as initial setting with a touch key on the displayed map may be used.

(Effects of the Invention) As is apparent from the above description, the present invention is directed to the destination direction component of the vehicle speed that changes momentarily as the vehicle travels, that is, the reduction speed of the straight line distance to the destination is the vehicle travel speed. In contrast to this, the driver sees the display, and the driver sees the display so that the decreasing speed of the linear distance is as close as possible to the traveling speed of the vehicle so that the decreasing speed of the linear distance to the destination is extremely close to the traveling speed of the vehicle. By driving like
There is no hassle of checking one's own driving position on a map as with a conventional navigation device, and the driver can constantly recognize whether the vehicle is approaching or moving away from the destination, ensuring safety and reliability. It will be possible to reach the destination. Also, a device for displaying images such as maps,
The device for displaying the current position of the vehicle and the destination, the device for matching the current position of the vehicle with the current position on the map, etc. are not required, and the vehicle-mounted navigation device is small and light in weight and inexpensive.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. 1 ... Direction sensor, 2 ... Distance sensor, 3 ... Storage device, 4 ... Keyboard, 5 ... Arithmetic / control device, 6 ...
Display device.

Claims (1)

[Claims] 1. A direction sensor for knowing the direction of the vehicle, a distance sensor for detecting the distance traveled by the vehicle, a storage device for storing coordinate points such as latitude and longitude with respect to a position, a current location of the vehicle, and an object. An input means for performing an initial setting of a place and the like; a control means for reading out predetermined storage contents of a destination and a present location from the storage device based on an instruction from the input means at the time of the initial setting; A linear distance between the destination and the current location and a destination direction component of the vehicle traveling speed are calculated based on the read-out stored contents of the destination and the current location and the output signals of the direction sensor and the distance sensor. A vehicle-mounted navigation device comprising: a computing unit; and a display unit that displays the straight line distance and a destination direction component of the vehicle traveling speed.