JPS62284213A - On-vehicle map display device - Google Patents

Abstract

PURPOSE:To display a current position and a current direction in a more easy- to-read state by interrupting the rotation of a map during the turning of a car and rotating the map by a specific angle a certain time after the car enters a straight driving state. CONSTITUTION:When azimuth data is inputted from an azimuth detecting means 1 to a turning angle calculating means 4, the difference (turning angle) between last azimuth data and current azimuth data is calculated. Then, a turning unit detecting means 5 detects whether or not the turning angle is larger than a specific value and when so, a detecting means 1 inputs the azimuth data to a straight driving detecting means 10 to detect whether the car moves straight or not. when it is decided that the car moves straight, a straight driving time calculating and storing means 11 calculates the straight driving time. Then when the straight driving is carried on for a specific time, a turning request decision means 12 outputs a turning request signal to a display control means 6 to rotate the display map with a control signal from a display data rotating means 9.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an in-vehicle map display device that displays the current location of the vehicle, a road map, information necessary for driving, etc. be.

(Prior Art) Conventionally, this type of in-vehicle map display device, as shown in Fig.
Display control means 6. It is equipped with an auxiliary storage means 7, a display data storage means 8, and a display data rotation means 9, and the displayed map is rotated every time the car rotates by a certain angle.

(Problems to be Solved by the Invention) In the conventional in-vehicle map display device described above, the displayed map rotates every time the angle of the vehicle changes by a certain angle.

On the contrary, it had the disadvantage that it made it difficult to know the current location and direction of travel.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an excellent in-vehicle map display device that overcomes the drawbacks of the prior art and is capable of stopping rotation while the angle of the vehicle is changing.

(Means for Solving the Problems) The in-vehicle map display device of the present invention is provided with a one-turn vehicle position detection means, a straight-ahead detection means, a straight-ahead time calculation and storage means, and a one-rotation request determination means. After making the change, the vehicle starts driving straight ahead, and the display direction of the map is automatically rotated based on the determination that a certain period of time has elapsed.

(Function) According to the present invention, when the rotation of the car is finished and straight-ahead driving is detected, the subsequent traveling time is calculated and stored, and after a certain period of time has elapsed, the direction of the currently displayed map is calculated and stored. A request can be automatically made to rotate the map by the difference in orientation currently in progress.

(Example) An example of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 shows the configuration of an on-vehicle map display device according to the present invention. In this figure, the same parts as those in the conventional example shown in FIG. 3 are designated by the same reference numerals, and the explanation thereof will be omitted.

In FIG. 1, reference numeral 10 denotes straight-ahead detection means, which is connected to the one-turn vehicle position detection means 5 and the straight-ahead time calculation storage means 11. Reference numeral 12 denotes a rotation request determining means for issuing a one-rotation request, which receives the output of the straight travel time calculation storage means 11 and sends the determination result to the display control means 6.

FIG. 2 shows the main operating means of the above embodiment. Direction data is input from the direction detection means 1 in FIG. 1 to the rotation angle calculation means 4. This rotation angle calculating means 4 calculates the difference (rotation angle) between the previous azimuth data and the current azimuth data. The rotation unit detection means 5 detects whether the rotation angle calculated by the one rotation angle calculation means 4 is larger than a predetermined value (for example, 5.6°). Here, if the rotation angle is larger than a predetermined value, azimuth data is input from the azimuth detection means 1 to the straight-ahead detection means IO. The straight-ahead detecting means 10 detects whether the orientation per unit time is changing (whether the vehicle is traveling straight or not). When it is determined that the vehicle is traveling straight, the straight traveling time is calculated by the straight traveling time calculation storage means 11.

When the vehicle continues to travel straight for a predetermined period of time, a rotation request signal is output from the rotation request determining means 12 to the display control means 6.

One display map is rotated by a control signal from the display data rotation means 9. In this way, the straight-ahead detecting means 10 can detect straight-ahead driving, and if there is no straight-ahead driving for a certain period of time, it will not issue a request to rotate the map, which has the advantage of not rotating the map while the angle of the vehicle is changing. .

(Effects of the Invention) According to the present invention, while the car is rotating, the rotation of the map is stopped,
After a certain period of time has elapsed after entering the straight line.

The map is automatically rotated by a predetermined angle, which has the effect of displaying the current location and direction more clearly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an in-vehicle map display device according to an embodiment of the present invention, FIG.
The figure is a block diagram of a conventional in-vehicle map display device. 1...Direction detection means, 2...Vehicle speed detection means,
3...Display orientation storage means, 4...Rotation angle calculation means, 5...Rotation unit detection means, 6...Display control means, '7...Auxiliary storage means, 8...Display data Storage means, 9...Display data rotation means, 10
. . . Straight traveling detection means, 11 . . . Straight traveling time calculation storage means, 12 . . . Rotation request determination means. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A rotation unit detection means, a straight-ahead detection means, a straight-ahead time calculation storage means, and a rotation request determination means are provided, and the determination is made based on the fact that the vehicle has changed its direction by more than a certain angle, started going straight, and a certain period of time has elapsed. An in-vehicle map display device characterized by automatically rotating the display direction of a map.