JP2738783B2 - Moving object position detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a position of a moving body such as a crane or a vehicle moving along a predetermined traveling path.

[0002]

2. Description of the Related Art FIG. 4 is a schematic diagram showing a conventional position detecting device for a moving body. This device is a position detecting device of an induction wireless system, and includes a loop antenna 51 provided on a moving body 50, three sets of guide lines 52 intersecting two parallel lines in each section, and three sets of guide lines. A decoder 53 for detecting a phase difference between the induced voltages and outputting position information.

In the position detecting apparatus of the guide radio system having the above configuration, the traveling path of the moving body 50 is divided into certain sections, an absolute address is given in each section by a binary code, and two parallel lines are provided in accordance with the addresses. The guide lines are crossed, the phase of the induced electric field is inverted at the intersection, the phase difference between the induced voltages by the three sets of guide lines is detected, and the logic process is performed by the decoder 53 to determine the position of the moving body 50. Ask.

Now, when the moving body 50 is at a position,
The decoder 53 outputs the position information of “0,0,0”, and when it moves to the position, the decoder 53 outputs the position information of “1,0,0”. The main controller (not shown) of the moving body 50 determines the position of the moving body 50 based on the position information from the decoder 53.

[0005]

However, the position detection apparatus of the conventional inductive radio system is susceptible to noise and level fluctuation, and it has been difficult to perform highly accurate position detection. In addition, a plurality of expensive guide wires must be laid along the moving direction of the moving body, and there is a disadvantage that the cost increases.

Further, in the conventional apparatus, when there are a plurality of moving bodies on a certain traveling path, when the plurality of moving bodies are to be divided, for example, the frequency of the induced electric field is changed or the generation timing of the induced electric field is changed. Has to be changed, which has the disadvantage that the circuit becomes complicated and the device becomes expensive.

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and provides a position detecting device for a moving body capable of detecting, with a simple configuration, the position of the moving body moving on a predetermined traveling path with high accuracy. It is intended to provide.

[0008]

A moving object position detecting apparatus according to the present invention for achieving the above object is provided substantially parallel to a moving direction of a moving object moving on a predetermined traveling path, and is provided with a position detecting device. A display unit on which a reference code for detection is displayed, and an optical reading unit provided on the moving body and optically reading the code displayed on the display unit,
Decoding means for decoding the output signal from the optical reading means and outputting the position information of the moving body, when decoding the output signal, the moving body was located on the boundary between the code of the position detection In the case, the code on both sides of the boundary
It is characterized in that an average value of the corresponding position information is adopted.

[0009]

According to the present invention, the optical reading means provided on the moving body displays the information on the display means,
For example, a code such as a bar code is read, and the code is decoded by a decoding unit to obtain position information.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram of a moving object position detecting device according to an embodiment of the present invention. FIG. 2 is a diagram for explaining an operation for detecting the position of the apparatus according to the present embodiment.
This embodiment apparatus, the bar code 1 ₁ to 1 _n of constant width and absolute address display panel 1 displayed number in the longitudinal direction, provided on the moving body 10 such as a vehicle to move the traveling path defined It comprises an optical reading device 2 and a decoder 3 for decoding an output signal of the optical reading device 2 and outputting position information. Although not shown, the optical reading device 2 includes a light emitting unit and a light receiving unit, and reads a bar code on the absolute address display panel 1. The decoder 3 receives the output signal of the optical reading device 2 and outputs a signal corresponding to the bar code read by the optical reading device 2 as position information.

When the position of the moving body 10 traveling in the direction of the arrow in FIG. 1 is detected, light is emitted from the light emitting section of the optical reading device 2 and reflected light is detected by the light receiving section to convert an optical signal into an electric signal. Thus, the value of the bar code on the absolute address display board 1 is read. The read barcode value is decoded by a logical process by the decoder 3 and sent as position information to a main controller (not shown) that controls the traveling of the moving body 10 and the like.

In the apparatus of the present embodiment, as shown in FIG. 2, the moving body 10 has a boundary 1 between the bar code 1 _m and the bar code 1 _{m +} 1.
If it is located above ₁ , the value of 1 _{m + 1} will be
Numerical interval of continuous location information represented, and moving object
Familiarize yourself with the direction of travel of, Toka value of 1 _m, which has already passed through
The average value 1 _{(m + m + 1) / 2} is output, and the moving body 10 is moved from the boundary 11 to a bar code 1 _m or a bar code 1 _{m + 1.} If it is approaching, the value of the barcode on the approaching side is output.
That is, for example, a bar code 1 _m is a numerical value of 102,
When the barcode 1 _{m + 1} is the numerical value 103, when the moving object 10 is located on the boundary 11 between the numerical value 102 and the numerical value 103, 102.5 is output. In addition, if it is slightly closer to 102 from the boundary, 102 is output. As a result, according to the present embodiment, it is possible to perform position detection with higher accuracy than the conventional one. Further, when high-accuracy position detection is required, an intermediate value such as 101.25 may be output.

Further, according to this embodiment, even if there are a plurality of moving bodies, only one absolute address display plate 1 is required, so that the position of each moving body can be easily and accurately detected by a simple structure. can do.

FIG. 3 is a schematic block diagram of a moving object position detecting apparatus according to a second embodiment of the present invention. In the first embodiment, a case has been described in which the moving body moves on a straight line. However, the present embodiment is a position detecting device for a moving body that is movable in the vertical and horizontal directions. The device of the second embodiment comprises two absolute address display boards 1a and 1b laid in X and Y directions orthogonal to each other.
And two optical reading devices 2a, 2b for reading bar codes displayed on the two absolute address display plates 1a, 1b.
2b and an XY decoder 30 that decodes output signals from the two optical reading devices 2a and 2b and outputs position information. Since the functions of the absolute address display boards 1a and 1b, the optical reading devices 2a and 2b, and the XY decoder 30 are substantially the same as those of the first embodiment, detailed descriptions thereof will be omitted.

The position of a moving body, such as a crane, which travels freely in a plane, is detected by the embodiment apparatus having the above-described configuration. Other functions and effects are the same as those of the first embodiment.

In the above embodiment, the case where the code of the display means is a bar code has been described. However, the code may be a numeral or another coded pattern. Also,
In the above embodiment, the case where the position of the moving body moving in one direction or within the plane is detected has been described, but the moving body may move in space.

[0017]

As described above, according to the present invention, an optical reading means is provided on a moving body moving on a predetermined traveling path, and the sign of the display means laid almost parallel to the moving direction of the moving body is provided. By reading, the position of the moving body can be known, so that the structure is simpler than the conventional one, and a highly accurate and inexpensive moving body position detection device that is not affected by electrical noise. Can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a moving object position detection device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining an operation for detecting a position of the apparatus according to the embodiment.

FIG. 3 is a schematic configuration diagram of a moving object position detection device according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a conventional moving object position detecting device.

[Explanation of symbols]

 1,1a, 1b Absolute address display plate 2,2a, 2b Optical reader 3,30 Decoder 10,10a Moving object

Continued on the front page (72) Inventor Takeshi Nomura 45-18 Takakuracho, Hachioji-shi, Tokyo Iwatsu Isel, Ltd. (72) Inventor Akira Kimura 45-18 Takakuracho, Hachioji-shi, Tokyo Iwatsu Isel, Inc. (56 ) References JP-A-60-256813 (JP, A) JP-A-61-122715 (JP, A) Jpn.

Claims (1)

(57) [Claims] 1. A display means installed substantially parallel to a moving direction of a moving body moving on a predetermined traveling path and displaying a reference code for position detection, provided on the moving body, An optical reading unit that optically reads a code displayed on the display unit; and a decoding unit that decodes an output signal from the optical reading unit and outputs position information of a moving body, and decodes the output signal. In this case, when the moving object is located on a boundary between the codes of the position detection, an average value of position information corresponding to each of the codes on both sides of the boundary is adopted. apparatus.