JP5314365B2 - Wireless communication system and equipment for construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To establish a radio communication path which is not affected by any noise from an unnecessary slave radio unit or the like. <P>SOLUTION: A master radio unit 1 starts with a reference frequency, and successively switches a plurality of radio frequencies, and retrieves one or more available frequencies other than the reference frequency, and after the reference frequency is restored, the master radio unit 1 transmits a confirmation signal for confirming the existence of a slave unit. The slave radio unit also starts with the reference frequency, and waits for a confirmation signal from the master radio unit 1 while maintaining the reference frequency, and when receiving the confirmation signal, the slave radio unit transmits a confirmation reply signal to the master radio unit 1, and temporarily establishes a radio communication path between the master radio unit 1 and the slave radio unit to be the other communication party with the reference frequency. The master radio unit 1 transmits an instruction to shift to an available specific frequency 3 other than the reference frequency to the slave radio unit, and the master radio unit 1 itself also shifts to the specific frequency 3. The master radio unit 1 reestablishes the radio communication path with the slave radio unit to which the master radio unit 1 has transmitted the shift instruction, and then transmits/receives data with the specific frequency 3. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention selects one radio frequency from a plurality of radio frequencies, and performs data transmission / reception between one or a plurality of parent radio devices and one or a plurality of sub radio devices. The present invention relates to a wireless communication system and apparatus for construction machines such as hydraulic excavators.

  As a conventional wireless communication system for construction machines, there is one disclosed in Patent Document 1. FIG. 7 is an explanatory view showing a wireless communication system of this conventional construction machine.

As shown in FIG. 7, in the prior art, the master radio first searches for one available frequency by sequentially switching a plurality of radio frequencies, and the slave radio that becomes the communication partner at the frequency determined to be available. A connection request signal is transmitted to. On the other hand, the slave radio similarly searches for one usable frequency by sequentially switching a plurality of radio frequencies. The search for the slave radio is performed regardless of the search for the master radio. When a connection request signal from the parent radio device is received and identified at one searched available frequency, data communication is performed between the parent radio device and the child radio device at that frequency.
JP-A-9-224279

  In the above-described prior art, when wireless communication is performed between one master radio device and a plurality of slave radio devices, a slave radio device that is not a communication partner can be used by sequentially switching a plurality of radio frequencies. Since the operation of searching for a single frequency is continued, the communication between the master radio device and the slave radio device performing communication such as data acquisition is periodically affected as noise. This may lead to a malfunction of the construction machine when this communication method is used for remote operation of a construction machine such as a hydraulic excavator.

  In the above-described prior art, when transmitting / receiving a connection request signal and a connection response signal at one available frequency, noise generated from the periphery, for example, another wireless communication device or high-voltage line used in the periphery, etc. There may be a case where transmission / reception of the connection request signal and the connection response signal becomes impossible due to noise generated by the construction machine. At that time, it is conceivable that the sub radio moves to the next frequency search. If it does so, until it will come to the same frequency as a parent radio again, a parent radio will be in a standby state and will take extra time.

  In the above-described prior art, since the parent radio device and the child radio device search for a plurality of frequencies independently of each other, if the number of child radio devices increases, it takes time to establish a wireless communication path. It will be.

  The present invention was made from the actual situation in the above-described prior art, and its purpose is to establish a wireless communication path that is not affected by noise from an unnecessary child radio apparatus and a parent radio apparatus / child radio apparatus in another communication path. It is an object of the present invention to provide a construction machine wireless communication system and apparatus that can be established.

  In order to achieve this object, the radio communication system of the construction machine according to the present invention selects one available radio frequency from among a plurality of radio frequencies, and one or a plurality of parent radio devices, In a radio communication system of a construction machine that transmits / receives data to / from one or more slave radios, the master radio starts up at a reference frequency that is one of a plurality of radio frequencies, Sequentially switching one of the radio frequencies to search for one or a plurality of frequencies other than the reference frequency, and after returning to the reference frequency, transmits a confirmation signal for confirming the presence of the child radio, The slave radio is activated at the reference frequency, which is one of a plurality of radio frequencies, and is waiting for the confirmation signal from the parent radio while maintaining the reference frequency. To the parent radio Then, after transmitting the confirmation signal, the master radio enters a reception waiting state for the confirmation response signal from the slave radio, and receives the confirmation response signal from the slave radio. When the mobile station is identified, it transmits a connection request signal only to the slave radio device to be a communication partner, and the slave radio device transmits the confirmation response signal and then transmits the confirmation response signal. The child radio device that is in a state of waiting for reception of a connection request signal and has transmitted the connection request signal transmits a connection response signal to the parent radio device, and the child radio device to which the connection request signal has not been transmitted is After a certain period of time, the confirmation signal from the parent radio device is returned to the standby state, whereby a radio communication path is once established between the parent radio device and the child radio device to be a communication partner at the reference frequency. After the establishment, the parent radio Transmits an instruction to shift to one or a plurality of specific frequencies that can be used other than the reference frequency to the child radio, and also shifts to the specific frequency. The wireless communication path is established again with the child radio apparatus instructed to transfer, and data is transmitted / received.

  In the construction machine radio communication system according to the present invention configured as described above, the slave radio usually waits for a confirmation signal from the master radio fixed to a reference frequency which is one of a plurality of radio frequencies. One or more available only after the parent radio device searches for one or more available frequencies and establishes a communication path with the child radio device to communicate at the reference frequency. It is designed to send and receive data by instructing a shift to the frequency of the data. In other words, only the child radio device to be communicated with the parent radio device performs wireless communication at a frequency other than the reference frequency, and the remaining child radio device remains at the reference frequency, thereby remaining child devices. Influence of noise due to communication signal from radio, or influence of noise due to communication signal between another master radio and slave radio, that is, unnecessary slave radio and master / slave radio in another communication path A wireless communication path that is not affected by noise from the wireless communication device can be established between the parent wireless device and the child wireless device to be communicated.

Also, transmission / reception of a confirmation signal and confirmation response signal for identifying a child wireless device to be communicated with the parent wireless device is fixed to the reference frequency described above, and a wireless communication path is established once at the reference frequency. Therefore, even when transmission / reception of the confirmation signal and the confirmation response signal is temporarily disabled due to noise or the like, it is possible to eliminate as much as possible the useless time for the parent radio device to be in a standby state. Further, with respect to Kona winding machine to be communicated, it can be reliably instruction transmission of frequencies available. Furthermore, since the frequency for searching and identifying the child radio devices to be communicated is limited to the reference frequency, the radio communication path can be established in a relatively short time.

The radio communication system for a construction machine according to the present invention, in the above invention, in the reference frequency, and transmits the acknowledgment signal simultaneously from a plurality of the terminal radio against the acknowledgment signal from the master radio set The transmission timing of the acknowledgment signal is generated and transmitted according to the unique address of each of the slave radio devices. The present invention configured as described above can avoid crosstalk of wireless communication at the same frequency.

  In the construction machine radio communication system according to the present invention, in the above invention, the master radio unit sequentially switches a plurality of radio frequencies and searches for one or a plurality of frequencies other than the reference frequency. At the searched frequency, first, it does not transmit a radio wave, but monitors whether there is another radio wave at the frequency for a certain period of time. Then, it is characterized by shifting to a search for another frequency. The present invention configured as described above does not affect the communication frequency even when a parent wireless device different from the corresponding parent wireless device and a child wireless device are already communicating.

  Further, in the radio communication system for a construction machine according to the present invention, in the above invention, the slave radio device to which the connection request signal from the master radio device has not been transmitted continues the standby state with the reference frequency. It is characterized by.

  In order to achieve the above object, the wireless communication device for a construction machine according to the present invention selects one or more available radio frequencies from a plurality of radio frequencies, and performs data transmission / reception. In a radio communication device for a construction machine including a master radio device and one or a plurality of slave radio devices, the master radio device is activated at a reference frequency that is one of a plurality of radio frequencies. , Sequentially switching a plurality of radio frequencies to search for one or a plurality of frequencies other than the reference frequency, and after returning to the reference frequency, transmit a confirmation signal for confirming the presence of the child radio The slave radio is activated at the reference frequency that is one of a plurality of radio frequencies, and remains on the reference frequency, waiting for the confirmation signal from the parent radio, When the confirmation signal is received, An acknowledgment signal is transmitted to the line device, and after the master radio transmits the confirmation signal, the master radio enters a state of waiting for reception of the acknowledgment response signal from the slave radio, and the acknowledgment response from the slave radio When a signal is received and identified, a connection request signal is transmitted only to a child radio device to be a communication partner, and the child radio device transmits the confirmation response signal, and then transmits the confirmation response signal. The slave radio that has been in a state of waiting to receive the connection request signal from the transmitter and that has transmitted the connection request signal transmits a connection response signal to the master radio, and the slave radio that has not received the connection request signal. The machine returns to the standby state for the confirmation signal from the parent radio device after a certain period of time, whereby wireless communication is performed between the parent radio device and the child radio device to be a communication partner at the reference frequency. After establishing the route once, before The master radio transmits an instruction to shift to one or more specific frequencies that can be used other than the reference frequency to the slave radio, and the master radio also shifts to the specific frequency. At a specific frequency, it is used when implementing a wireless communication system of a construction machine that establishes a wireless communication path and transmits / receives data again with the child wireless device instructed to shift, and the parent wireless device and the child wireless device are: It is characterized by comprising the same equipment configuration.

  The construction machine wireless communication apparatus according to the present invention configured as described above can be used in the above-described wireless communication system, and can obtain the same effects as described in the above-described wireless communication system. Since the slave radio device has the same device configuration, both can be used as a master radio device or a slave radio device by switching internal software.

  Further, the construction machine wireless communication apparatus according to the present invention is the wireless communication apparatus according to the invention, wherein each of the master radio and the slave radio can be connected to a radio communication means and a communication line in the construction machine. The first communication means for acquiring construction machine operating data, the storage means for temporarily storing the acquired operating data, and the construction machine operating data being used at a location away from the construction machine. A second communication means connectable to a data control device for performing the control, and a wireless communication means, the first communication means, the storage means, and a control unit for controlling the second communication means. Characterize

  The construction machine wireless communication system and apparatus according to the present invention can establish a wireless communication path that is not affected by noise from an unnecessary child wireless apparatus and a parent wireless apparatus / child wireless apparatus in another communication path. Therefore, the reliability of data to be transmitted / received can be improved as compared with the conventional case. Thereby, when utilized for wireless communication in remote operation of a construction machine, there is no fear of causing a malfunction of the construction machine, and high-accuracy wireless communication for a remotely operated construction machine can be realized. In addition, it is possible to collect various operation data of construction machines with high accuracy in a short time. In addition, it is possible to reduce retransmission of data when communication is not possible, thereby shortening the communication time compared to the conventional case. In addition, since the frequency for searching and identifying the child radio devices to be communicated is limited to the reference frequency, the time until the radio communication path is established can be shortened compared to the conventional case.

  In addition to the above-described effects, the radio communication device for a construction machine according to the present invention has the same device configuration as the parent radio device and the child radio device. It can be used as a wireless device or a slave wireless device, and can be used for practical purposes because it can ensure versatility with respect to the installation location of these wireless devices.

  The best mode for carrying out the wireless communication system and apparatus for construction machines according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a state when a confirmation signal is transmitted from a parent radio device 1 in an embodiment of a wireless communication system for construction equipment according to the present invention, and FIG. 2 is a diagram showing transmission and reception of each signal in the present embodiment. It is a timing chart which shows a flow. 3 in the present embodiment, the parent wireless device 1 to a specific slave radios 3, 4, 5 have been data transmission and reception at a particular frequency 3 Rutotomoni, other child wireless device 1, 2, · · · N FIG. 4 is a block diagram showing that a confirmation signal from the parent radio device 1 is in a standby state (excluding 3, 4, 5), and FIG. 4 is another parent different from the parent radio device 1 in this embodiment. radio 2 and 3 to other child wireless device 1 which has been a standby state as illustrated, (excluding 3, 4, 5) · · · N is the parent wireless device 1 and the slave radio set 3 , 4 and 5 are block diagrams showing a state in which data transmission / reception is performed at a specific frequency M different from frequency 3 in which data transmission / reception is performed . FIG. 5 is a flowchart showing an embodiment of the construction machine wireless communication system according to the present invention.

  For example, a plurality of slave radio devices are mounted on a construction machine such as a hydraulic excavator, a crane, or a road machine that is operating at a construction site. The master radio device 1 is used by being connected to a device that is used by, for example, a serviceman of a construction machine manufacturer to acquire operation data of the construction machine. This device is, for example, a dedicated data control tool or a personal computer.

  Since the slave radio is a device mounted on a construction machine (not shown), it is activated before the master radio 1. Therefore, as shown in FIG. 1, the slave radio device is normally waiting for a signal from the master radio device 1, that is, a call (S2 in FIG. 5). The frequency used at this time is only the reference frequency 1 which is one of a plurality of radio frequencies.

  When the master radio device 1 is activated for service data acquisition or the like by the service person, the master radio device 1 is activated at the reference frequency 1 which is one of a plurality of radio frequencies, and the plurality of radio frequencies are set. By sequentially switching from 1 to N, one or a plurality of specific frequencies that can be used other than the reference frequency 1 are searched (S1 in FIG. 5). For example, as shown in FIG. 2, the frequency 3 and the frequency M form a specific frequency that can be used.

The reason for searching for multiple frequencies is that if only one is searched, there is a possibility that another parent radio device is already using it when it moves to this frequency later with the child radio device. It is. If you search for multiple available specific frequencies, even if the first available specific frequency cannot be used, you can smoothly transition to the second and third available specific frequencies. It is. For example, when the parent radio device searches for one or a plurality of specific frequencies that can be used other than the reference frequency 1 by sequentially switching a plurality of preset radio frequencies, at the searched frequency, first, to the frequency whether other radio waves there a certain time monitoring without transmitting a radio wave of the frequency, including the radio wave transmitting in the frequency without, if there are other radio waves, the search for another frequency To migrate to.

  After searching for one or a plurality of available frequencies and returning to the reference frequency 1 (S3 in FIG. 5), a confirmation signal is transmitted in order to confirm whether or not there is a child radio device in the vicinity (FIG. 5). S4). When the slave radio device receives the confirmation signal from the master radio device 1 (S5 in FIG. 5), the slave radio device transmits a confirmation response signal for notifying its own existence to the parent radio device 1 (S6 in FIG. 5).

  At this time, since the master radio device 1 receives confirmation response signals from a plurality of child radio devices, there may be a child radio device having the same timing. In this case, each acknowledgment signal is not recognized by the parent radio device 1 due to interference between signals on the same frequency. In order to avoid this, the transmission timing of the response signal is generated based on the unique address possessed by each of the slave radio devices, and is transmitted based on the transmission timing. The unique address is made up of, for example, a model code and a serial number of the construction machine on which the child radio is mounted. For this reason, there is no child radio device having the same unique address, and therefore the transmission timing generated based on the unique address is also unique to each child radio device. As a transmission timing generation method, a part of the model code and the serial number is regarded as a numerical value, and a value obtained by multiplying the numerical value by a certain time value, for example, 1 ms, 2 ms, or 10 ms may be used as the transmission timing. Alternatively, each slave radio device may have a random number table, and the transmission timing may be generated based on the random number table and the unique address.

  After transmitting the confirmation signal, the master wireless device 1 waits for reception of a confirmation response signal from the slave wireless device for a predetermined time (S7 and S8 in FIG. 5). The certain time referred to here is convenient to be about 3 to 4 seconds, for example. If it is too short, there is a possibility that the master wireless device 1 cannot receive the confirmation response signal from the child wireless device. If it is too long, it is impossible to know whether it is waiting for reception or not operating. Further, in this case, there is a possibility that the confirmation response signal from the slave wireless device cannot be received at a time due to the influence of ambient environment noise or the like. In consideration of such a situation, it is desirable to repeat confirmation signal transmission and confirmation response signal reception waiting a plurality of times.

  After receiving and identifying the confirmation response signal from the child wireless device, the parent wireless device 1 transmits a connection request signal only to the child wireless device to be the other party (S9 in FIG. 5).

After transmitting the confirmation response signal, the slave radio device waits to receive a connection request signal from the master radio device 1 for a predetermined time (S10 and S11 in FIG. 5). The certain time referred to here is convenient, for example, about 5 to 6 seconds. This is because the time when the parent wireless device 1 waits to receive the confirmation response signal from the child wireless device adds time for analyzing the confirmation response signal received by the parent wireless device 1 and transmitting the connection request signal. Further, in this case, there is a possibility that the connection request signal from the parent radio device 1 cannot be received at a time due to the influence of ambient noise and the like. Considering such a situation, it is desirable to repeat the acknowledgment signal transmission and the connection request signal reception waiting a plurality of times.

  The child radio device that has received the connection request signal transmits a connection response signal to the parent radio device 1 (S18 in FIG. 5). The slave radio device to which the connection request signal has not been transmitted assumes that communication is unnecessary from the master radio device 1, and returns to the standby state of the confirmation signal from the master radio device 1, which is the startup state ( (S15-No in FIG. 5).

  After receiving the connection request signal, the slave radio device that has received the connection request signal waits for a predetermined time to receive a transition instruction from the master radio device 1 (S19 and S20 in FIG. 5). The certain time referred to here is convenient, for example, about 5 to 6 seconds. This is because the time when the parent wireless device 1 waits to receive the connection response signal from the child wireless device adds time to analyze the connection response signal received by the parent wireless device 1 and transmit the transition instruction.

  Further, in this case, there is a possibility that the transition instruction from the parent wireless device cannot be received at one time due to the influence of noise in the surrounding environment. Considering such a situation, it is desirable to repeat the connection response signal transmission and the transition instruction reception waiting a plurality of times.

  After transmitting the connection request signal, the master wireless device 1 waits for reception of a connection response signal from the slave wireless device for a predetermined time (S16 and S17 in FIG. 5). The certain time referred to here is convenient to be about 3 to 4 seconds, for example. If it is too short, there is a possibility that the master wireless device 1 cannot receive the connection response signal from the slave wireless device, and if it is too long, it is not known whether it is waiting for reception or not operating. Further, in this case, there is a possibility that the connection response signal from the slave radio device cannot be received at a time due to the influence of ambient noise and the like. Considering such a situation, it is desirable to repeat connection request signal transmission and connection response signal reception waiting a plurality of times. Alternatively, in this case, since the parent wireless device 1 knows which child wireless device is the partner that transmitted the connection request signal, the connection request signal is transmitted a plurality of times until a response from the child wireless device returns. You may do it. When the parent wireless device 1 receives a connection response signal from a child wireless device to be a communication partner, a necessary wireless communication path is once established.

  Thereafter, the parent radio device 1 transmits an instruction to shift to the available specific frequency searched earlier, for example, the frequency 3 shown in FIG. 2 (S25 in FIG. 5) to the child radio device with which the communication path has been established. Shifts to frequency 3 (S26 in FIG. 5). By establishing a communication path once at the reference frequency 1, an instruction to shift to a specific frequency that can be used can be reliably given to the slave radio device even in an environment where there is some noise, for example.

  At the shifted frequency 3, a wireless communication path is established again with the slave radio device that has transmitted the shift instruction, and data transmission / reception is performed (S27 in FIG. 5).

  As a result, wireless communication can be performed with the parent wireless device 1 at the frequency 3 that can be used only by the child wireless devices that need to transmit and receive data, for example, the child wireless devices 3, 4, and 5 shown in FIG. On the other hand, other slave radio devices, for example, the slave radio devices 1, 2,... N (except 3, 4, 5) shown in FIG. Wireless communication with devices 3, 4 and 5 should be performed stably without being affected by the state of these child wireless devices 1, 2,... N (excluding 3, 4, 5). Can do.

  At this time, when another serviceman activates another master radio 2 as shown in FIG. 4 to acquire operation data from a construction machine in the same work area, the above-mentioned master radio is described. As in the case of the machine 1, a plurality of radio frequencies are sequentially switched from 1 to N, and a frequency that can be used other than the reference frequency 1 is searched. Since the frequency 3 is being used by the parent radio device 1, in this case, for example, the frequency M shown in FIG. 2 is searched as an available frequency. After that, the base station 1 searches for and identifies a child radio device to be a communication partner, and shifts to an available frequency M. At frequency M, a radio communication path is established with a child radio device to be a communication partner, and data transmission / reception is performed.

  Accordingly, as shown in FIG. 4, the master radio 1 and the slave radios 3, 4, and 5 have the frequency 3, and the master radio 2 and the slave radios 1, 2,... N (3,4, 4). (Except 5) is frequency M, and data can be transmitted and received without affecting each other's wireless communication.

  After the data transmission / reception at the frequency 3 or the frequency M is completed, the slave radio device returns to the reference frequency 1 and enters a standby state for the confirmation signal from the master radio devices 1 and 2.

  According to the present embodiment in which communication is performed between the parent radio device and the child radio device in this manner, the child radio device is normally set to the parent radio frequency fixed to the reference frequency 1 which is one of a plurality of radio frequencies. After waiting for a confirmation signal from the device, only the parent wireless device searches for one or more available frequencies, and once establishes a communication path with the child wireless device to communicate at the reference frequency 1 Instructing the transition to one or more available frequencies, data transmission / reception is performed. In other words, only the child radio device to be communicated with the parent radio device performs wireless communication at a frequency other than the reference frequency 1, and the remaining child radio device is left at the reference frequency 1 to be left. The influence of noise caused by communication signals from a slave radio, or the influence of noise caused by communication signals between another master radio and a slave radio, that is, an unnecessary slave radio and a master radio / child on another communication path A wireless communication path that is not affected by noise from the wireless device can be established between the parent wireless device and the child wireless device to be communicated. As a result, when the wireless communication method according to the present embodiment is used for wireless communication in the remote operation of the construction machine, there is no fear of causing a malfunction of the construction machine, and high-precision wireless communication with respect to the remotely operated construction machine is performed. Can be realized.

Further, transmission / reception of a confirmation signal for identifying a child wireless device to communicate with a parent wireless device and a confirmation response signal is performed with the reference frequency 1 fixed and the wireless communication path is once set at the reference frequency 1. Therefore, even if transmission / reception of the confirmation signal and the confirmation response signal is temporarily disabled due to noise or the like, it is possible to eliminate as much as possible the useless time in which the parent wireless device is in the standby state. As a result, the communication time can be shortened. Further, with respect to Kona winding machine to be communicated, it can be reliably instruction transmission of frequencies available. Furthermore, since the frequency for searching and identifying the child radio devices to be communicated is limited to the reference frequency 1, the radio communication path can be established in a relatively short time, and the radio communication path is established. Can be shortened.

Furthermore, when transmitting an acknowledgment signal simultaneously from a plurality of slave radios against the confirmation signal from the main radio, to send generates a transmission timing of the acknowledgment signal in response to the unique address of the child wireless device respectively Therefore, it is possible to avoid crosstalk of wireless communication at the same frequency, which contributes to improving the reliability of data to be transmitted and received.

  Further, when the parent radio device searches for one or a plurality of frequencies that can be used other than the reference frequency 1 by sequentially switching a plurality of radio frequencies, at the searched frequency, first, the parent radio device does not transmit radio waves. If there is no other radio wave at that frequency for a certain period of time, if there is no other radio wave starts to be transmitted, and if there is another radio wave, it shifts to search for another frequency, Even when a parent wireless device different from the corresponding parent wireless device and a child wireless device are already communicating, the communication frequency is not affected, and wireless communication protection in other wireless communication paths can be realized.

  FIG. 6 is a block diagram showing an embodiment of a wireless communication apparatus used for implementing the wireless communication system shown in FIGS. In one embodiment of the wireless communication apparatus shown in FIG. 6, the parent wireless device A and the child wireless device B have the same device configuration.

  That is, the master radio device A can be connected to the radio communication unit Aa, the communication line C in the construction machine, the first communication unit Ab that obtains the operation data of the construction machine, and the acquired operation data temporarily. A storage means Ac for storing the data, a second communication means Ad that is used in a place away from the construction machine and can be connected to a data control device D for obtaining operation data of the construction machine, and a wireless communication means Aa, The first communication unit Ab, the storage unit Ac, and the control unit Ae that controls the second communication unit Ad are provided.

  Similarly, the slave radio B can also be connected to the radio communication means Ba and the communication line C in the construction machine, the first communication means Bb for obtaining the operation data of the construction machine, and the obtained operation data. Temporary storage means Bc, second communication means Bd that is used in a place away from the construction machine and that can be connected to the data control device D for acquiring operation data of the construction machine, and wireless communication means Ba The first communication unit Bb, the storage unit Bc, and the control unit Be for controlling the second communication unit Bd.

  According to one embodiment of the wireless communication apparatus according to the present invention configured as described above, the same operation and effect as described in the above-described wireless communication method can be obtained by using the wireless communication method described above. Since the wireless device A and the child wireless device B have the same device configuration, both of them can be used as the parent wireless device A or the child wireless device B by switching the internal software. The versatility with respect to the installation location can be ensured and is practical.

It is a block diagram which shows a state when the confirmation signal is transmitted from the main radio | wireless machine 1 in one Embodiment of the radio | wireless communication system of the construction machine which concerns on this invention. It is a timing chart which shows the flow of transmission / reception of each signal in one Embodiment of the radio | wireless communication system of the construction machine which concerns on this invention. In one embodiment of a wireless communication system for a construction machine according to the present invention, the parent wireless device 1 to a specific slave radios 3, 4, 5 Rutotomoni doing data transmission and reception at a particular frequency 3, other child wireless device FIG. 2 is a block diagram showing that 1, 2,... N (excluding 3, 4, 5) are in a standby state for a confirmation signal from a parent radio device 1; In one embodiment of a wireless communication system for a construction machine according to the present invention, the parent wireless device 1 other child wireless device 1 which has been a standby state as shown in different parent radio 2 and 3 differ from, 2,... N (excluding 3, 4 and 5) are data at a specific frequency M different from the frequency 3 at which the main radio 1 and the sub radios 3, 4 and 5 perform data transmission / reception It is a block diagram which shows the state which is performing transmission / reception . It is a flowchart which shows one Embodiment of the radio | wireless communication system of the construction machine which concerns on this invention. It is a block diagram which shows one Embodiment of the radio | wireless communication apparatus of the construction machine based on this invention used for implementation of the radio | wireless communication system shown in FIGS. It is explanatory drawing which shows the radio | wireless communication system of the conventional construction machine.

Explanation of symbols

A parent wireless device Aa wireless communication device Ab first communication device Ac storage device Ad second communication device Ae control unit B parent wireless device Ba wireless communication device Bb first communication device Bc storage device Bd second communication device Be control device

Claims (2)

In a radio communication system of a construction machine that selects one available radio frequency from a plurality of radio frequencies, and transmits and receives data between the master radio and a plurality of slave radios,
The master radio, starts at a reference frequency, which is one of a plurality of radio frequencies, by sequentially switching a plurality of radio frequencies to search a plurality of frequencies available in other than the reference frequency, is searched At that frequency, first of all, it does not transmit the radio wave of that frequency and monitors whether there is another radio wave at that frequency for a certain period of time. If not, it selects that frequency as an available frequency. If there is, move to search for another frequency, and after returning to the reference frequency, transmit a confirmation signal for confirming the presence of the slave radio,
The slave radio is activated at the reference frequency, which is one of a plurality of radio frequencies, and is waiting for the confirmation signal from the parent radio while maintaining the reference frequency. Is transmitted to the parent radio device when an acknowledgment signal is received,
After the master radio transmits the confirmation signal, the master radio enters a state of waiting for the confirmation response signal from the slave radio, and when the acknowledgment signal from the slave radio is received and identified, Send a connection request signal only to the child radio that should be
After transmitting the confirmation response signal, the slave radio enters a state of waiting for reception of the connection request signal from the master radio, and the slave radio to which the connection request signal is transmitted is sent to the master radio A slave radio that has transmitted a connection response signal and the connection request signal has not been transmitted returns to the standby state of the confirmation signal from the master radio after a predetermined time has elapsed,
The master radio unit establishes a radio communication path between the master radio unit and the child radio unit to be a communication partner at the reference frequency, and then sets the slave radio unit other than the reference frequency. Sending an instruction to shift to a specific frequency that can be used, itself also shifts to the specific frequency, and establishes a wireless communication path again with the child radio device instructed to shift at the specific frequency, Only the slave radio to be communicated is wirelessly communicated at a frequency other than the reference frequency, and the remaining slave radio is sent and received while maintaining the reference frequency.
When each of the slave radios transmits an acknowledgment signal in response to the confirmation signal from the parent radio at the reference frequency, transmission of the confirmation response signal according to a unique address of each of the slave radios A construction machine wireless communication system characterized by generating and transmitting timing . In a radio communication device of a construction machine that selects one available radio frequency from a plurality of radio frequencies, and transmits and receives data between a master radio and a plurality of slave radios,
The master radio, starts at a reference frequency, which is one of a plurality of radio frequencies, by sequentially switching a plurality of radio frequencies to search a plurality of frequencies available in other than the reference frequency, is searched At that frequency, first of all, it does not transmit the radio wave of that frequency and monitors whether there is another radio wave at that frequency for a certain period of time. If not, it selects that frequency as an available frequency. If there is, move to search for another frequency, and after returning to the reference frequency, transmit a confirmation signal for confirming the presence of the slave radio,
The slave radio is activated at the reference frequency, which is one of a plurality of radio frequencies, and is waiting for the confirmation signal from the parent radio while maintaining the reference frequency. Is transmitted to the parent radio device when an acknowledgment signal is received,
After the master radio transmits the confirmation signal, the master radio enters a state of waiting for the confirmation response signal from the slave radio, and when the acknowledgment signal from the slave radio is received and identified, Send a connection request signal only to the child radio that should be
After transmitting the confirmation response signal, the slave radio enters a state of waiting for reception of the connection request signal from the master radio, and the slave radio to which the connection request signal is transmitted is sent to the master radio A slave radio that has transmitted a connection response signal and the connection request signal has not been transmitted returns to the standby state of the confirmation signal from the master radio after a predetermined time has elapsed,
The master radio unit establishes a radio communication path between the master radio unit and the child radio unit to be a communication partner at the reference frequency, and then sets the slave radio unit other than the reference frequency. Sending an instruction to shift to a specific frequency that can be used, itself also shifts to the specific frequency, and establishes a wireless communication path again with the child radio device instructed to shift at the specific frequency, Only the slave radio to be communicated is wirelessly communicated at a frequency other than the reference frequency, and the remaining slave radio is sent and received while maintaining the reference frequency.
When each of the slave radios transmits an acknowledgment signal in response to the confirmation signal from the parent radio at the reference frequency, transmission of the confirmation response signal according to a unique address of each of the slave radios A wireless communication apparatus for a construction machine, which generates and transmits timing .

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