JPH0520683B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a vehicle position display device that is attached to a vehicle such as an automobile, detects the vehicle's traveling position, and displays the detected vehicle traveling position on a map on a display screen. It is something. [Problems to be solved by the prior art and the invention] Conventionally, position information of a vehicle is calculated from vehicle mileage information and angular velocity information, map information is stored in advance, and the map information and the calculated position are calculated. Japanese Patent Laid-Open No. 60-48600 proposes a vehicle position display device that corrects deviations in position information with respect to map information by comparing the position information with map information. The proposed device uses map data consisting of positional information in the XY coordinates of each intersection, branch point, and corner (hereinafter collectively referred to as a point) stored in the storage means and point numbers adjacent to each point. A straight line between points is calculated, and the coordinates of the vehicle's current position are displayed on the straight line. In addition, as shown in Fig. 7, the direction of travel at each point, that is, the route, is determined by establishing a route determination area JE as shown by the dotted line centered at point _P1 , and using the signals from the angle sensor and distance sensor. Based on this. However, conventionally, during this route determination, the current position of the vehicle is displayed on an extension of the route the vehicle was traveling before entering the intersection, as shown in Figure 7a, or As shown in FIG. b, route determination was either done by fixing the point at the intersection where the route was currently being determined. Note that the thick line in the figure indicates the trajectory of the mark (circle) indicating the current position. The above-mentioned conventional display during route determination is such that in the case _{of FIG} . For example, at a T-junction, the mark indicating the current position may deviate from the route. Further, at crossroads, marks are displayed to make it appear as though the vehicle has gone straight even if the vehicle turns right or left, which poses a risk of misunderstanding the driver and degrades the quality of the display. On the other hand, in the case of Fig. 7b, the current position, which was fixed at the point during route determination, changes after route determination.
Display quality deteriorates because the display jumps to the position where the coordinates have been corrected. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vehicle position display device that accurately displays the vehicle running position in the vicinity of a point in a way that is easy for the driver to understand and that also improves the quality of the display. [Means and operations for solving the problems] In order to solve the above-mentioned problems, the vehicle position display device according to the present invention, as shown in the basic configuration diagram of FIG. An angle detection means A detects the angle of the vehicle based on a signal from the vehicle; an odometer B provided on the vehicle detects the distance traveled by the vehicle; A calculation means C for calculating position information, a storage means D for storing map information including the coordinates of the branch point, and a mileage determined by the signal from the odometer B and the storage means D
determination means E for determining whether the route determination area has been entered based on the coordinates of the branch point stored in the route determination area;
a display means F that displays a map based on the map information stored in the storage means D and also displays the vehicle position; and when the determination means E does not determine that the vehicle has entered the route determination area; When the vehicle position is displayed on the map route by the signal from the odometer B and it is determined that the vehicle has entered the route determination area, the vehicle position is displayed by the display means F on the route of the map. and a display control means G that performs the display based on position information from. With the above configuration, the way the vehicle position is displayed on the display means F is switched between before and after entering the route determination area, and within the route determination area, the display takes into account the actual angle of the vehicle, so that the vehicle's progress is Misperception of direction will not occur, and display quality will also be improved. [Example] Hereinafter, an example of a vehicle position display device according to the present invention will be described based on the drawings. FIG. 2 is a block diagram showing an embodiment of a vehicle position display device according to the present invention. In the figure, 11
12 is an odometer that generates a signal corresponding to the running of the vehicle; and 12 is an angular velocity sensor such as a vibrating gyro sensor that detects the angular velocity based on the running of the vehicle. Measured value signals from the odometer 11 and the angular velocity sensor 12 are taken into the CPU 13 . The CPU 13 operates according to a program stored in advance in the ROM 14 to perform various processes, reads data necessary for the process from the RAM 15, and stores the processing results in the RAM 15. 16 is a keyboard for inputting necessary data from the outside, 17 is for displaying data.
A display device such as a CRT, and 18 a memory for storing map information. The map information stored in the memory 18 is, for example, about road points as shown in FIG.
It consists of position information indicated on the XY coordinates and the numbers of points adjacent to that point. That is,
Regarding the road in Figure 3, as shown in the table below, point P ₀ stores position information X ₀ and Y ₀ , adjacent points P ₁ and P ₄ , respectively, and point P ₁ stores position information X ₁ , Y ₁ and adjacent point information P ₀ , P ₂ , P ₃ are stored.

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Claims (1)

[Scope of Claims] 1. Angle detection means for detecting the angle of a vehicle based on a signal from an angular velocity sensor provided on the vehicle; an odometer provided on the vehicle for detecting the distance traveled by the vehicle; and the angle detection means. calculation means for calculating vehicle position information based on signals from the odometer and the odometer; storage means for storing map information including the coordinates of the branch point; and the odometer and the distance determined from the odometer. determining means for determining whether the route determination area has been entered based on the coordinates of the branch point stored in the means; and display means for displaying a map and the vehicle position based on the map information stored in the storage means. and, when the determination means does not determine that the vehicle has entered the route determination area, the display means displays the vehicle position on the route of the map based on the signal from the odometer, and the vehicle has entered the route determination area. A vehicle position display device comprising: display control means for causing the display means to display the vehicle position based on the position information from the calculation means when it is determined that the vehicle position has fallen.