JPS637855Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention is useful for determining the position of a moving object such as a car when it is moving toward a certain destination, the direction of the destination, and the direction of the moving object along the way. It is a device that displays in real time the distance, etc., and can display that the target location has been approached and passed, and can manually or automatically calibrate the position coordinates when passing the target location. The present invention relates to a position coordinate detection device installed inside a moving body.

(Prior Art) Conventionally, various position coordinate detection devices for detecting the position of this type of vehicle have been developed.

(Problem that the invention aims to solve) However, with this device, the north direction, the direction of the target location, and the distance to the target location are simultaneously displayed on the panel with respect to the direction of travel of the vehicle. Conventionally, there has been no position coordinate detection device that can display the passing of the target location and also calibrate the position coordinates appropriately at the time of passing the target location.

(Means for solving the problem) The device according to the present invention has a rotating magnetic piece and a fixed coil, and a geomagnetic vector detector that obtains an azimuth signal by detecting the phase of an alternating current signal generated in the coil, and a The vehicle's direction of travel, the direction of the destination, and the distance to the destination are calculated from the speedometer that obtains the distance pulse, and these are displayed on the direction display.
Furthermore, when the straight line distance to the target location falls within the approach detection zone and passage detection zone set for the target location, it is displayed by a blinking lamp in the approach judgment zone and a lit lamp in the passage judgment zone. It is.

(Example) Figure 1 shows an example of the direction display section of the present invention.
FIG. 2 is a diagram for explaining the operation. In FIG. 1, the outer circle 1 indicates a north indicator indicating the north direction with respect to the direction of travel of the vehicle, that is, θ ₁ in FIG. 2. On the other hand, the inner circle 2 is a target display that shows the direction of the destination T ₀ with respect to the direction of travel of the vehicle, that is, θ ₂ in Fig. 2, 3 is a passing indicator lamp, 4 is a target point number display, and 5 is a distance This is the display section. Set several destination points in advance, and set the distance range for passing judgment for each destination (radius d).
I'll keep it. When calibrating the position coordinates at the target location, the coordinates of the point to be calibrated are input into the central processing unit (CPU) in advance.

FIG. 2 is a diagram showing the current position and target location of the moving object on the X-Y plane. In the figure, P _i is the position coordinate of the moving object, T ₀ is the target location, 7 is the approach determination zone, and 8 is the passage determination zone.

When the moving vehicle approaches the target location _T0 , the passage indicator lamp 3 (ZONE) in Fig. 1 flashes from the approach judgment zone 7 in the distance range twice the set value d, and the passage judgment zone whose radius is the set value d flashes. When it reaches 8, it is judged as passing and the light turns on. When the moving vehicle further advances and passes through the passage judgment zone 8, P and NO on the display section 4 become the number of the next destination, and the direction of the destination on the inner circle of the display section also indicates the next destination. It will show you the direction. In this way, the north direction and the direction of the destination can be displayed simultaneously in real time with respect to the moving direction of the moving object. In addition, by calculating the distance using pulses from the car's tachometer, and finding the coordinates of P _i in Figure 2 from the direction of travel and comparing them with the coordinates of the previously determined destination, the current position in Figure 2 can be determined. The straight line distance R _i from P _i to the target location T ₀ is simultaneously displayed on the distance display section.

The size of the passage determination zone with respect to the destination can be set arbitrarily, but it needs to be larger than the expected error range for the distance from the origin (starting point) or calibration point to the destination on the map.

FIG. 3 shows an embodiment in which position coordinate calibration is performed within the passage determination zone described above. In the figure, 9 is an intersection, and 10 is the route of the moving object.

Further, FIG. 4 shows a configuration for realizing the present invention based on the above principle. This will be discussed next. In the figure, 11 is a vehicle speedometer, 12 is a geomagnetic vector detector, 13 is a coordinate input keyboard, and 14 is a
15 is a calculation processing circuit, 15 is a direction change detection circuit of 80° or more, 16 is a measurement position coordinate memory, 17 is a passage judgment comparison circuit, 18 is an approach judgment comparison circuit, 19 is a set coordinate memory, 20 is magnetic north detection, target direction comparison 21 is a magnetic north display target location display section, 2 is a passage display circuit, and 23 is an approach display circuit. Vehicle speedometer 1
1 to the geomagnetic vector detector 12.
The azimuth and angle signals are respectively extracted from the azimuth angle signals, and the arithmetic processing circuit 14 calculates the position coordinates (X _i Y _i ) of the vehicle. The position coordinates of the car are stored in the measured position coordinate memory 16 every moment from the origin (00). On the other hand, multiple target location coordinates (including intersection coordinates (X ₀ Y ₀ )) are
The coordinates are input in advance from the coordinate input keyboard 13 and stored in the measurement coordinate memory 19. The intersection coordinates (X ₀ Y ₀ ) of one of the target locations and the previously measured position coordinates (X _i Y _i ) are compared by the approach determination comparison circuit 18 . The car starts from the starting location coordinates (00),
Approaching the intersection, the straight line distance R _i (=
When √(X _i −X ₀ ) ² + (Y _i −Y ₀ ) ² ) satisfies the condition of d<R _i <2d, that is, when it reaches the first predetermined value 2d,
An approach determination signal, which is a first signal, is output from the approach determination comparison circuit 18 to the approach display circuit 23, causing the passage display lamp 3 shown in FIG. 1 to blink.

When the vehicle further approaches the intersection and satisfies the condition R _i <d, that is, when the second predetermined value is reached, the passage determination comparison circuit 17 outputs a second signal, a passage determination signal, to the passage display circuit 22. The passage indicator lamp 3 lights up. The above approach judgment and passing judgment are at intersections,
This is carried out only in the direction approaching a predetermined value such as a target location.

While the passing indicator lamp 3 is on, when a vehicle on the path 10 turns right or left at the intersection 9 as shown in FIG. The data of the measured position coordinates at that time are transferred to the memory 16 and replaced with preset intersection coordinates (X ₀ Y ₀ ) to perform automatic calibration of the position coordinates. By this means, any accumulated errors that may have existed to some extent are eliminated. In the above case, the 80° or more azimuth change detection circuit 15 operates only at points where the intersection coordinates, etc. have been input into the set coordinate memory 19 in advance.

In addition, the magnetic north detection and target location comparison circuit 20 receives the measured position coordinate data from the measured position coordinate memory 16, calculates the direction of magnetic north with respect to the direction of travel of the vehicle, and simultaneously stores the measured position coordinate data and the set coordinate memory 19. By comparing the target location coordinates (X _p Y _p ) with the target location coordinates (X p Y p ), the direction of the destination location relative to the direction of travel of the vehicle is calculated. The calculated magnetic north direction and target location direction are displayed on the magnetic north marker and target location display section 21, respectively.
and turn on the indicator lamps for each direction as shown in the shaded areas in Figure 1.

The configuration has been described above, but for the intersection shown in Figure 3, the following methods can also be considered.

That is, a signal source of the induced magnetic field may be installed at the intersection, and the coordinates may be switched when the vehicle detects the induced magnetic field. Alternatively, the coordinates may be calibrated by visually observing that the vehicle has come to an intersection and manually pressing a switch for replacing the coordinates at that point.

(Effect of the invention) When a moving object such as a car is traveling toward a certain target, especially over long distances, in mountainous areas, in unfamiliar places, or at night, the direction of the vehicle, the direction of the destination, and the destination Simultaneously displaying the distance to the destination in the car and showing the exact position coordinates at the time of travel in real time has a great effect on the safe driving of automobiles. Further, there is the advantage that the direction indication is always effective regardless of the route taken, even if detours are taken.

Furthermore, by wirelessly transmitting vehicle position information detected by such a position coordinate detection device to a base station, a highly accurate automatic vehicle monitor (AVM) system can be realized.

[Brief explanation of the drawing]

Figure 1 is a display of the device according to the present invention, Figure 2 is a diagram for explaining the operation of the present invention, Figure 3 is a diagram for explaining the implementation of position coordinate calibration, and Figure 4 is a diagram for explaining the operation of the present invention. The configuration for realizing this is shown below. 1... North display section, 2... Target display section, 3... Passage indicator lamp, 4... Number display section, 5... Distance display section, 7... Approach judgment zone, 8... Passage judgment zone, 11 ... Vehicle speedometer, 12 ... Geomagnetic vector detector, 13 ... Coordinate input keyboard, 14 ...
Arithmetic processing circuit, 15... azimuth 80° or more change detection circuit, 16... measurement position coordinate memory, 17... passing judgment comparison circuit, 18... approach judgment comparison circuit, 19
...Setting coordinate memory, 20...Magnetic north detection, target location comparison circuit, 21...Magnetic north display target location display section, 22...Passage display circuit, 23...Approach display circuit.

Claims (1)

[Scope of utility model registration request] A device that displays the direction of movement and the direction of a target location of a moving object, which is equipped with a geomagnetic vector detector that obtains the direction signal of the moving object, and has arithmetic processing that calculates the instantaneous position from the moving distance obtained from the speedometer and the direction signal. A circuit, a measured position coordinate memory that stores the instantaneous position, and a straight line distance is calculated from the instantaneous position and the preset target location coordinates, and when the straight line distance is within the radius of the preset approach determination zone, an approach determination signal is generated. a passing judgment comparison circuit that generates a passing judgment signal when the straight line distance is within the radius of a preset passing judgment zone; Direction to calibrate instantaneous position with target coordinates
It is equipped with a change detection circuit of 80 degrees or more and a set coordinate memory that stores the set coordinates of the target location, and a north display section that detects and displays magnetic north as a direction display section, and a target display section that determines and displays the target location. , comprising: a distance display section that displays the straight-line distance; a passage display lamp that blinks when the approach determination signal is received and lights up when the passage determination signal is received; and a number display section that displays the number of the destination. Position coordinate detection and display device.