JPS5928844B2 - Vehicle position display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for displaying the position of a vehicle while it is running, and more specifically, it displays the current position of the vehicle on a map having an arbitrary scale according to the vehicle's running. The present invention relates to a device for displaying images.

Conventionally, the purpose of position confirmation or control of a moving object has been achieved through communication with an external control station or object.

To confirm the position of the moving object, that is, the navigation of a ship or an airplane, there are radio navigation methods such as radar and other PPI scope methods, and hyperbolic navigation such as Kuran and Detsuka. These devices, for example radar, are designed to display the surrounding geography based on the route of the moving object, while those used for traversing, etc., display the communication results on a preset chart ( The position on the chart can be determined by In either case, the moving body emits and receives radio waves, thereby making it possible to confirm the position based on, for example, the propagation time difference and phase difference of the received radio waves. These are extremely expensive, and needless to say, it is unthinkable to use them in the vehicle that is the object of the present invention. In addition, in vehicles, driving guidance on highways, for example, by emitting radio waves from the road side,
It seems that something is being considered that would instruct the vehicle to brake or move toward the center.

However, there is no device like the one found in the above-mentioned ships and flying planes that can confirm the location on a map. On the other hand, when it comes to vehicle operation, road maps are currently used to navigate (drive) to a destination.

In this case, it is often difficult for the driver to find the location of the vehicle on a map in unfamiliar territory, and the vehicle is also a waste of time due to danger and anxiety. SUMMARY OF THE INVENTION Therefore, the present invention provides a device that displays the current position of a vehicle while it is traveling on the road map and allows the user to confirm the current position of the vehicle.

To briefly explain the outline of the above-mentioned device, it detects the traveling distance of the car and the direction in which the car is traveling, and based on these detection signals, drives the drive means to operate the display provided on the bottom of the road map. The vehicle's current location is displayed on the road map.

The vehicle is equipped with the vehicle position display device.
By equipping your car with this vehicle position display device, you can easily reach your destination without fail when driving in an unknown location. As a result, time efficiency and economic efficiency are improved, and a sense of psychological security leads to safer driving. Also, if you consider the above in reverse and use prots outside instead of display, you can create a road map of the required part (the part traveled by car). Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a block diagram of a vehicle position display device according to the present invention. Reference numeral 1 indicates a direction detector for detecting the direction of a vehicle, which is a combination of a photoconductive cell such as a phototransistor and a direction magnet.

2, the distance traveled is input from a rotation sensor (trip meter) based on the rotation speed of the axle of the car, and a step pulse is pulsed that indicates the unit distance traveled by a logical operation with the set value of the road map scale factor, which will be described later. This is a distance determination circuit configured to derive the distance through the generator 3.

The above step pulses are output in accordance with the scale of the road map used on the display, and are
- Corresponds to the movement unit (step) in the Y direction. 4 displays the current position of the vehicle on the display 5 by inputting the signal from the direction detector 1 mentioned above and the step pulse from the pulse generator 3 which is output when traveling a unit distance. This is a display driver that controls the

The display 5 has a road map printed on a transparent or translucent sheet on its surface, and the location of the vehicle, that is, the midpoint a of the map, is illuminated from the bottom to indicate the location. There is. As this display, a normal matrix display, a planar display such as a cathode ray tube, or one in which a point light source such as a lamp is moved can be used. In the following embodiments of the present invention, a matrix display will be used as a display. On the other hand, 6 is a position adjustment device that sets the starting position on the map or corrects accumulation errors on winding roads by applying a signal to the display driver 4, and its operation is controlled by a manual switch. conduct. For example, if the position of point a in the figure is the start position, the position adjustment device 6 moves the display 5 through the display driver 4 to display this part.
In other words, it controls. Next, the direction detector 1 that detects the direction of travel of a vehicle will be explained.

As shown in FIG. 2, this direction detector 1
A magnetic needle 10 is provided with the origin of the horizontal and vertical axes as fulcrums, and the vertical axis direction is fixed to coincide with the direction of travel of the car, and a square grid shape is formed with the origin as the center, for example, 8 directions of 45 degrees and 9' directions as shown in the figure. In order to perform detection in 16 directions with double precision, photo cells 11, 12, . . . , 26 are provided at respective locations. Here, regarding direction detection by the direction detector 1, the magnetic needle 10
Photocells 11, 12...26 by a part of
By selecting the corresponding portion, the traveling direction of the vehicle is detected and a signal is derived. For example, in the state shown in FIG. 2, the vehicle is traveling north, and when the magnetic needle 10 is on the photocell 25, the direction of travel of the vehicle is northeast. In this case, the photocells 11, 12, . This is to accommodate the matrix display shown in FIG. Furthermore, in the direction detector 1 shown in FIG. 2, if the magnetic needle 10 is at an even numbered sign of the photocell, it cannot be displayed on the display 5. Therefore, if the magnetic needle 10 is on the photocell 26, the display of the start position (current position) is once shifted from point A to point B in the vertical direction, and if the magnetic needle 10 is pointing in the same direction, it is 45 minutes from point B. The approximation is made by shifting to point C in the ° direction. Here, depending on the required accuracy, the accuracy can be increased by increasing the number of detection directions of the direction detector 1, that is, the number of photocells. As described above, the vehicle position display device of the present invention determines the scale factor of the road map from the original distance determination circuit 2 through the pulse generator 3 as the vehicle travels, and calculates the scale factor of the road map in accordance with the travel of the vehicle. A pulse is output.

On the other hand, the direction of travel of the vehicle is detected by the direction detector 1, and this detection signal is input to the display driver 4. Then, the display driver 4 sequentially shifts the display of the matrix display 5 each time the step pulse is input together with the signal from the direction detector 1, so that the road map placed on the display 5 is displayed on the road map. It acts to display the current location of the car. In short, every time the vehicle travels a unit distance, the point a on the display 5 is sequentially shifted together with the signal from the direction detector 1 to display the current position of the vehicle. For example, if the unit step d of the light emitting sources arranged in a matrix on the display 5 shown in FIG.
A step pulse is output every time the vehicle travels m.

Therefore, when the magnetic needle 10 of the direction detector 1 is at the position of the photocell 25, as mentioned above, the car is traveling in the northeast direction, and this signal is input to the display driver 4, and the 10m
After traveling, the display is shifted from point A to point E in FIG. 3, and the display is sequentially shifted (moved) in accordance with the direction of travel every time the vehicle travels 10 meters. Next, the present invention will be explained in more detail with reference to the circuit diagram of FIG.

Here, in order to match the above explanation, it is assumed that the scale of the road map placed on the display 5 is 1/10,000, and that the unit step d of the display 5 is 1 mm.

In the figure, 61 and 62 are manual switches of the position adjustment device 6, where the switch 61 adjusts the Y direction of the display 5, and the switch 62 adjusts the X direction.They are normally in the state shown in the figure, and each AND gate Al, One input terminal of each of A2...A8 is set to HI level. First, the current position of the vehicle, that is, the starting position is set on the road map, and it is assumed that the starting position is point a in the diagram.

Therefore, in order to display point a on the display 5, the switches 61 and 62 are turned to the corresponding contact side. For example, if the switch 61 is turned to the U side, one input terminal of the AND gate A becomes HI level, and one input terminal of the AND gate Al7 also becomes HI level via the OR gate 02. On the other hand, a low frequency pulse generator 30 is connected to another input terminal of the AND gate Al7, and a low frequency pulse is derived from the output side of the AND gate Al7 and applied to the pulse generator 3 via the OR gate 01. . Subsequently, this pulse generator 3 outputs a step pulse corresponding to the above-mentioned low frequency pulse, and this step pulse is applied to one input terminal of the above-mentioned AND gate A, and the OR gate 04 is output from the output side of the AND gate A9. The signal is inputted to the U(1) side of the up-down counter 41 through the U(1) side of the up-down counter 41. Here, the contents of the up-down counters 41 and 42 are for storing one point of X-Y on the display 5, and when input to the respective input terminals, the contents are transmitted to the X-Y drivers 43 and 44 to display the display 5. shift. That is, in this case,
U of up-down counter 41 (hereinafter referred to as counter)
Since step pulses are sequentially input to the ... side, the display on the display 5 is sequentially shifted in the Y direction (vertical) and upward by the Y driver 43. At this time, as shown in FIG. 5, at the point "n" that matches the Y coordinate of point a (m-n), which is the current position of the car, return the switch 61 to its original position and open the AND gate A. In the 0FF state, the display stops at a point that matches the AOY coordinates of the start position. next,
To match the X direction, that is, the left and right directions, in this case, as described above, it is sufficient to flip the switch 62 to either the R or L side.
Alternatively, the step pulse from the pulse generator 3 is input to either input terminal of the counter 42 via the counter 42. Then, by the action of the X driver 44, the display is sequentially shifted in the Y direction (left and right), and when it matches the X coordinate of point AO), it is "m".
When the switch 62 is returned to its original position, the start position (current position) point a is displayed on the display 5. At this time, the counters 41 and 42 store the display position of the point a, that is, the coordinates (m-n). As explained above, the adjustment of the starting position of the car has been completed, and the driver then drives the car toward the destination, but first, let us assume that the driving direction is due west.

In this case, when the car travels a unit distance, that is, 10 m, one signal is derived from the distance determination circuit 2 and is input to the pulse generator 3 via the OR gate 01.
At the same time one more step pulse is output, it is input to AND gates Al, A2 . . . A8, respectively. On the other hand, the direction detector 1 detects the magnetic needle 1 because the car is traveling west.
0 is located at the position of the photocell 15, a signal is derived from this portion, the AND gate A6 becomes ON state, and is inputted to the counter 42 via the OR gate 08. Therefore, by the action of the X driver 44, point a moves one step westward, ie, to the left, to the position of coordinates (m-1, n) as shown in FIG. If the car continues to drive west in this state, 1
A step pulse is output every time the vehicle travels 0TrL, and point a sequentially moves to the left (to the west on the road map). (
(Position of coordinates (m-2, n) in Figure 5) After that, when the vehicle has traveled 10 meters, if the vehicle is heading north, the signal from photocell 1 and the step pulse are input to AND gate A1. Counter 4 via OR gate 04 from the output side
1, the display 5 moves the point a in the Y direction, that is, upward, under the action of the Y driver 43, and displays the current position of the vehicle. The coordinates of point a at this time are (m-
2, n+1). Then, after running 10m, the magnetic needle 10
If it faces photocell 25, the direction of travel of the car is northeast, and AND gate A and AND gate A open.
A pulse is input to each counter 41, 42, and the display moves in the Y direction and the X direction. That is, by the action of the X-Y drivers 43 and 44, point a moves upward and rightward one step at a time to the coordinates (m-1, n+2). Furthermore, there is 1 car
After traveling 0m, if the magnetic needle 10 is facing the photocell 24, AND gates A3 and A5 open, and AND gate A3
The output of is temporarily stored in the position shift memory FF. On the other hand, the output of AND gate A5 is input to the counter 42,
Move the display to the right using the X driver 44. At this time, the point a displayed on the display 5 moves to the coordinates (M, n+2). The position shift storage device F-F1 is a flip-flop that stores the first input signal and returns to the original state with the second signal. This is because if the magnetic needle 10 described above is at an even numbered position of the photocell, the corresponding direction cannot be displayed on the display 5 after traveling 10 m, and once the point a (current position) is moved to the coordinates (M, n+2), and then after traveling a unit distance without changing direction, AND gates A3 and A5 open as above, and position shift memory F-F1
At the same time as returns to its original state, the AND gate ALL opens and the signal is input to the counter 41 via the OR gate 04. On the other hand, the counter 42 also receives one pulse from the AND gate A5, so the point a moves to the coordinates (m+1, n+3), and that point is displayed on the display 5, so it takes an approximate value. . As mentioned above, after traveling a unit distance,
Any photocell 11, 12...2 of the direction detector 1
AND gate Al, A2...A8 by the signal from 6
One or two of the gates open, a step pulse is input to each counter 41, 42, and the display 5 shows the current position of the vehicle, that is, point a explained above, to the destination according to the road map. They will be displayed sequentially.

If the driver or an assistant drives on the wrong road to the destination, the current position of the vehicle is displayed every moment after traveling a unit distance, so the driver or assistant will notice that the vehicle is on the wrong road. Therefore, when driving in an unknown place, it becomes easier to reach the destination without fail, and instead of stopping the car and opening the road map to confirm the current location and direction. This eliminates the hassle of driving, improves time and economic efficiency, and provides a sense of psychological security, leading to safer driving. Furthermore, if an error occurs between the actual current position and the actual current position while the vehicle is traveling, it can be easily corrected by using the manual switch 6 for setting the start position. As explained above, the vehicle position detection device according to the present invention displays the current position of the vehicle on the road map as the vehicle travels. This eliminates the troublesome effort of confirming the current location, direction, etc., and allows efficient progress towards the destination. Another field of application of the present invention is to use a plotter instead of a display to create a road map or the like according to the driving of the vehicle.

[Brief explanation of drawings]

Fig. 1 is a block diagram for explaining the configuration of a vehicle position display device according to the present invention, Fig. 2 is a diagram showing an embodiment of a direction detector according to the present invention, and Fig. 3 is a diagram for explaining a display shift on a display. FIG. 4 is a circuit diagram showing an embodiment of the present invention, and FIG. 5 is a diagram showing a display shift when explaining the circuit diagram. 1...Direction detector, 2...Distance determination circuit, 4...Display driver, 5...Display, 6...Manual switch .

Claims (1)

[Claims] 1. A display on which a road map is placed and displays the position of the car on the map, a direction detection means for detecting the direction of travel of the car, a distance detection means for detecting the distance traveled by the car, and a display from both of the above-mentioned detection means. display driving means for controlling the display based on a detection signal of the vehicle; and a manual switch for setting an initial position on the display before traveling, the manual switch correcting an error with the actual position during traveling. A vehicle position display device characterized in that it doubles as a manual switch.