JPS61108080A - Production control system for car - Google Patents

Abstract

PURPOSE:To enable a timely correspondence for the change of production planning by overwriting the information to be sent from a movable communication device to a workstation based on a command coming from a fixed communication device. CONSTITUTION:When a fixed communication device receives the unique information sent from a movable communication device using an antenna 21 for receiving, received signals are demodulated by a demodulation circuit 23 and then arithmetically processed by a microcomputer 27. In addition, the information signal corresponding to the unique information is transmitted to a computer 30 for control through an interface 28. Besides, the computer 30 for control that inputs this information signal performs a work command for a work by a workstation based on the information signal.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a system for issuing work commands at each work station for workpieces on an automobile production line based on information transmitted from a mobile communication device attached to the workpiece. related to a manufacturing management system for automobiles.

[Prior Art] The configuration of a typical automobile manufacturing line is shown in FIG. 4, for example. This consists of a floor main line 1 where the floor main assembly is assembled from the front body, front floor, rear floor, side members, etc.
On the floor main assembly above, left and right body sides,
There is a body main line 2 where roofs, rear panels, cowls, parcel shelves, etc. are assembled, and a special work line 3 that performs work such as drilling that is only necessary for special specification vehicles.
A metal line 4 is used to assemble the front door, rear door, hood, trunk lid, etc., and a paint line 5 is used to paint the completed car body through the metal line 4 in a predetermined color, and a steering wheel and seat are added to the painted car body. ,
It consists of a temporary mounting line 6 for assembling repair parts such as instrument panels.

By the way, in a production line configured as described above, in the so-called "mixed flow line! 1tlTi system", which manufactures a wide variety of automobiles with different specifications, models, standards, etc., each work station It is necessary to determine the specifications, model, standards, etc. of the workpiece, and perform work based on this identification information.In recent years, therefore, communication devices have been installed on the workpieces on the production line, and the workpiece-specific information transmitted from this communication device has been installed. Systems have been proposed in which information (specifications, models, standards, etc.) is received at the work station and work instructions are given to the work based on this received information.

Conventionally, as this type of system, for example, Japanese Patent Application Laid-Open No. 57-20
There are those disclosed in Japanese Patent Application Laid-open No. 9667 and Japanese Patent Application Laid-open No. 57-211437.

Taking the painting line 4 in FIG. 4 as an example, this becomes a system as shown in FIG. 5, for example. In the figure, inside a car body 10 to be painted (an object to be painted as a workpiece), information unique to the car body 10 (hereinafter simply referred to as unique information) such as vehicle model information, paint color information, and painting part information of the car body is stored. is stored in advance and a communication device 11 for transmitting the stored unique information is installed, while a painting robot 14 and a color change device 15 for switching the paint supplied to the painting robot are installed at the work station for the painting process. In addition, a receiving device 12 (having a trigger function for the communication device 11) that receives unique information transmitted from the communication device 11 is also installed. and,
When the vehicle body 1o moves to the work station, the receiving device 12 receives unique information from the communication device 11 attached to the vehicle body 10, which is activated by a trigger from the receiving device 12, and this received unique information is transmitted to a higher level. The information is transmitted to a control device 13 (computer) for process management, which is a device. The control device 13 detects the unique information inputted from the communication device 11 via the receiving device 12, and issues work instructions to the painting robot 14 in accordance with the type of vehicle and the area to be painted on the vehicle body 10, for example. , a work command is given to the color change device 15 to supply paint of a designated color to the painting robot 14. Therefore, the painting robot 14 and color change device 15 operate according to the work commands from the control device 13, and the vehicle body 10 is painted in accordance with the unique information stored in the communication device.

[Problems to be solved by the invention] However, in the conventional system where the unique information stored in the communication device @11 attached to the workpiece is fixed,
For example, in a manufacturing line as shown in FIG. 4, the workpieces input into the floor main line 1 are produced based on the above-mentioned fixed unique information until they are carried out as finished products from the robbery line 6. This made it impossible to change specifications within the production line. That is, there was a problem in that it was not possible to respond in a timely manner to changes in production plans, etc.

[Means for Solving the Problems] The present invention has been made in view of the above problems, and it is possible to respond more timely to changes in production plans, etc., and to provide more flexibility in production modes. An object of the present invention is to provide an automobile manufacturing management system that enables the production of automobiles, and in order to achieve this object, the present invention has been developed to A fixed communication device is installed to transmit information to and from the mobile communication device in an automobile manufacturing control system that receives information at a station and issues work instructions for work at the work station based on the received information. At the same time, the mobile communication device is provided with a storage means that enables new writing of information to be transmitted to the work station based on a command from the fixed communication device.

At each work station on the production line, work instructions are issued based on the information transmitted from the mobile communication device.
Work is performed on the work according to this work command. In such a manufacturing process, when the production specifications for a workpiece are changed, information corresponding to the new production specifications is written into the storage means installed in the mobile communication device based on commands from the fixed communication device, and the information is stored at subsequent work stations. The newly written information is transmitted, and a work command for the work is issued based on the content of this information. That is, after the new information is written into the storage means within the mobile communication device, work based on this new information is performed at each work station.

[Embodiments of the invention] Embodiments of the present invention will be described below based on the drawings.

The basic IM on the production line is almost the same as the conventional one, in which a mobile communication device (corresponding to the communication device 11 in Fig. 4) is attached to the workpiece, and each work station is connected to the mobile communication device. A fixed communication device (corresponding to the receiving device 12 in FIG. 4) for mutually transmitting information is installed at the work station, and the corresponding work station responds to the work based on the information content from the mobile communication device via the fixed communication device. A control computer is installed as a host device that issues work instructions.

Here, a specific configuration of the fixed communication device is shown in FIG. 2, for example. In the figure, 20 is a fixed communication device main body, 21 is a receiving antenna, and 24 is a transmitting antenna, and the fixed communication device main body 20 receives information from a mobile communication device attached to a workpiece via the receiving antenna 21. While inputting information, information from the fixed communication device 2o is transmitted to the mobile communication device via the transmitting antenna 24. The fixed communication device main body 20 includes an amplifier circuit 2 that amplifies the received signal via the receiving antenna 21.
2. It has a demodulation circuit 23 that demodulates the output signal from this amplifier circuit 22, and a microcomputer 27 that processes the signal from the demodulation circuit 23, and this microcomputer 27 corresponds to information from the mobile communication device. The arithmetic processing results are transmitted to the control computer via the interface 28. Further, the microcomputer 27 in the fixed communication device body 20 has a function of creating information to be transmitted to the mobile communication device based on operation input from an external keyboard device (not shown). The data created by the microcomputer 27 is transmitted to the mobile communication device via the modulation circuit 26, the amplification circuit 25, and the transmission antenna 24. Here, the modulation circuit 26 modulates the data from the microcomputer 27 using, for example, PCM modulation, and the format of this modulation signal is, for example, as shown in FIG. Then, information corresponding to the read or write command is placed, and then the original data is placed. For example, if the information corresponding to the above read or write command is a read command, all information is
If it is a write command, it is 30 bit data consisting of 15 bits for 11111 and 15 bits for "0".

On the other hand, the specific configuration of the mobile communication device attached to the workpiece is shown in FIG. 1, for example. In the figure, 41 is a receiving antenna, and 42 is a receiving antenna 4.
an amplification/demodulation circuit that amplifies and demodulates the received signal from 1;
43 is a waveform shaping circuit that shapes the waveform of the output signal from the amplification/demodulation circuit 42. Further, 44 creates an internal synchronization signal based on the first clock pulse of the received signal inputted via the receiving antenna 41, the amplification/demodulation circuit 42, and the waveform shaping circuit 43 and having the format shown in FIG. Clock separation circuit, 45 Q-tsuku separation circuit 44
A latch pulse output circuit 46 outputs a 1-bit width pulse signal of data based on a clock pulse from a latch pulse. A flip-flop (hereinafter simply referred to as FF) 47 that separates into bit data based on the latch pulse from the output circuit 45;
is F in synchronization with the pulse signal from the clock separation circuit 44.
a 4-bit counter that counts the output signal Q from F46;
48 is a 4-bit counter that counts the inverted output signal Q of F'46 in synchronization with the same pulse signal.

4 is a readable and writable memory element (hereinafter referred to as RAM); 50 is an erase permission signal for the RAM 49 to erase the stored data when each digit bit of the 4-bit counters 47 and 48 becomes all "1"; 51 is a write command detection circuit that detects the write signal from the write permission command circuit 50 and changes the output state. , when the output state of the write command detection circuit 51 changes based on the write signal from the write permission command circuit 50, the gate circuit 52 enters the allowable state, and the clock pulse from the clock separation circuit 44 is transmitted through the gate circuit 52. The signal is input to the RAM 49 as a write synchronization signal. Then, in synchronization with the clock pulse, the data (output Q) from the FF 46 is transferred to the RAM 49.
are written sequentially.

53 is a read command detection circuit that changes the output state when all the bits of each digit of the 4-bit counter 47 become "1"; 54 and 55 are oscillation circuits that output signals with unique frequencies f1 and f2, respectively; Read command detection circuit 5
At the time of the output state change in step 3, the waveform shaping circuit 43 enters the reception cutoff state, while each oscillation circuit 54, 55 is activated. Further, 56 is a frequency dividing circuit that divides the frequency of the oscillation signal from the oscillation circuit 54, 58 is an address counter, and the gate circuit 5 is in a prohibited state when reading data.
The RAM 49 is brought into a reading permission state by the output signal of 2, and is put into a reading permission state by the output signal from the gate circuit 52 which becomes the prohibition state in synchronization with the pulse signal from the frequency dividing circuit 56 via the gate circuit 57. The address counter 58 operates, and the data stored at the address specified by the address counter 58 is transferred to the RAM 4.
It is output serially starting from 9. Further, 59 switches the oscillation output of the oscillation circuit 54 or 55 according to the bit data output from the RAM 49 as described above. For example, if the bit 111 I+ is the frequency of the excavation circuit 54,
1 signal, if the pit is 0″, the frequency of the oscillation circuit 55 is “
This is a gate switch that switches between two signals, and the signal from this gate switch 59 is amplified by an amplifier circuit 60 and then transmitted from a transmitting antenna 61. That is, in data transmission in the mobile communication device shown in FIG.
cy S Bt Keying) modulation is performed. Note that when the output of the address counter 58, which operates in synchronization with the output pulse signal from the frequency dividing circuit 56, reaches a predetermined address, an end signal (END> is output from the address counter 58, and this end signal causes the read command detection cycle to start. The output of the path 53 is in a normal state.

Next, the operation will be explained.

The RAM 49 in the mobile communication device attached to the workpiece stores in advance unique information for the workpiece, as in the past. Here, when a workpiece to which a mobile communication device is attached is moved to a work station, a data reading command is issued to the mobile communication device from the fixed communication device installed at the work station. Specifically, the microcomputer 27 shown in FIG. 2 outputs 15 consecutive bits of "1" data corresponding to the read command following the clock pulse data in accordance with the format shown in FIG. The data is then transmitted to the mobile communication device via the modulation circuit 26, the amplification circuit 25, and the transmission antenna 24.

When data is sent from a fixed communication device as described above,
The mobile receiving device receives the data and 4 in FIG.
The bit counter 47 counts 15 bits of "1" data corresponding to the read command, and as a result, each bit of each digit of the 4-bit counter 47 becomes all "1", so the output state of the read command detection circuit 53 changes. do.

When the output state of the read command detection circuit 53 changes, the waveform shaping circuit 43 becomes inhibited to cut off the LJ and subsequent received signals, and the oscillation circuits 54 and 55 are activated. When the oscillation circuits 54 and 55 operate in this manner, the address counter 58 operates in synchronization with the pulse signal from the frequency dividing circuit 56 that divides the output signal from the oscillation circuit 54.
The unique information for the workpiece is read from the RAM 49 in the order of addresses specified by the address outputter 58.
By operating the gate switch 59 corresponding to each bit of the unique information from the RAM 49, the unique information is subjected to FSK modulation based on the fl and f2 signals from the oscillation circuit 54 and 55. The unique information thus modulated is then transmitted via the amplifier circuit 60 and the transmitting antenna 61 to a fixed communication device installed at the work station.

When the fixed communication device receives the unique information transmitted from the mobile communication device using the receiving antenna 21 as described above, the received signal is demodulated by the demodulation circuit 23 and then arithmetic processed by the microcomputer 27. An information signal corresponding to the information is transmitted to the control computer 30 via the interface 28. The control computer 30, which has received this information signal, issues work instructions for the workpiece at the work station based on the information signal. Specifically, assuming a work station on a painting line as shown in FIG. 5, the control computer 30 determines the vehicle type, painting area, paint color, etc. of the workpiece based on information signals corresponding to unique information. Then, based on the determination result, a work command is issued to the painting robot and color change device.

Normally, the unique information in the mobile communication device is transmitted to the fixed communication device as described above, and work instructions are issued at the work station based on the information received by the fixed communication device. Assuming that, for example, the contents of the RAM 49 in the mobile communication device are replaced with new information based on a command from the fixed communication device installed at the final work station of the metal line 4.

To explain specifically, the operator uses fixed communication from a keyboard device, etc.! When new unique information and write command information for the workpiece, including paint color information to be changed for the location, are input, the microcomputer 27 in the fixed communication device
processes the input information and converts the original data (corresponding to the unique information) into the format shown in Figure 3.
Create data with write command information and clock pulse information added before. At this time, the write command information is a total of 30 bits of data, including 15 bits of "1" data and 15 bits of "0" data. The data created as described above is then transmitted to the mobile communication device via the modulation circuit 26, the amplification circuit 25, and the transmission antenna 24.

When data is transmitted from the fixed communication device in this way, the mobile communication device receives the data, and the 4-bit counter 47 in FIG. While counting, the 4-bit counter 48 counts the latter 15 bits as 0.
``Count the inverted data (``1'') of the data.As a result, each digit bit of both 4-bit counters 47 and 48 becomes all ``1'', so the write permission command circuit 50 erases the data from the RAM 49. It outputs a write signal as well as a permission signal, and this erase permission signal causes the RA to
When M49 enters the write permission state, the output state of the write command detection circuit 51 that has detected the write signal changes. Then, the clock pulse from the clock separation circuit 44 via the gate circuit 52, which is in the permissible state at this time, is
') J and the subsequent data from F F 46, i.e.
The original data shown in FIG. 3 and corresponding to the new unique information are sequentially written into the RAM 49.

Above J: When the unique information in the mobile communication device is rewritten at the final work station of the sea urchin metal line 4, each work station of the painting line 5 and sacrificial line 6 will perform work according to the new unique information. A command is given.

In this embodiment, information is written to the RAM 49 in the mobile communication device by the fixed communication device installed at each station. A fixed communication device dedicated to writing information may be installed.

[Effect of the Invention J As explained above, according to the present invention, work instructions are given to workpieces at work stations based on information transmitted from a mobile communication device attached to a workpiece on an automobile production line. In this automobile manufacturing management system, the information to be transmitted from the mobile communication device to the work station can be rewritten based on a command from the fixed communication device that transmits information with the mobile communication device. An automobile manufacturing management system that allows for changes in specifications for workpieces on the production line at any time, enables more timely response to changes in production plans, and provides greater flexibility in production modes. becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a specific configuration of a mobile communication device in the automobile manufacturing management system according to the present invention, and FIG. 2 is a block diagram showing a fixed communication device installed at a work station in the automobile manufacturing management system according to the present invention. A block diagram showing an example of a specific configuration of the device, FIG. 3 is an explanatory diagram showing the format of data transmitted from the fixed communication device shown in FIG. 2, and FIG. 4 is a block diagram showing an example of an automobile manufacturing line. FIG. 5 is an explanatory diagram showing an example of a conventional automobile manufacturing management system. 20...Fixed communication device main body 30...Control computer 41...Receiving antenna 43...Waveform shaping circuit 44...Clock separation circuit 45...Latch pulse output circuit 46...Flip-flop (FF) 47.48...4-bit counter 49...Storage element (RAM) 50...Write permission command circuit 51...Write command detection circuit 53...Read command detection circuit 54.55 ...5 oscillation circuits...gate switch 61...transmission antenna□[

Claims (1)

[Claims] Manufacturing of automobiles in which a work station receives information transmitted from a mobile communication device attached to a work on the automobile production line, and issues work instructions for the work at the work station based on the received information. In the management system, a fixed communication device is installed to transmit information to and from the mobile communication device, and new information to be sent to the work station is installed in the mobile communication device based on instructions from the fixed communication device. 1. An automobile manufacturing management system characterized by being equipped with a storage means that allows data to be written.