Wireless control device, wireless control method and elevator control system

Abstract

The invention provides a wireless control device, a wireless control method and an elevator control system. The reliability of wireless communication can be easily ensured when transmission frequencies, channels and the like are switched. A wireless control device that controls wireless communication that is multiplexed by using a plurality of wireless transmission paths and that is performed between the wireless control device and a car (200), the wireless control device being provided with: a position acquisition unit (121) that acquires the movement position of the car (200); a transmission quality collection unit (122) that collects the relationship between the movement position and the transmission quality for each of the plurality of wireless transmission paths; a combination setting unit (123) that sets a combination of a wireless transmission path and a predetermined parameter on the basis of the transmission quality; and a switching unit (124) that determines, in the wireless transmission path set by the combination setting unit (123), the timing at which the parameter set by the combination setting unit (123) is switched, and that switches the parameter set by the combination setting unit (123) at the timing.

Description

Technical Field

[0001] The present invention relates to a wireless control device, a wireless control method, and an elevator control system. In particular, the present invention relates to a wireless control device that can be appropriately used when wireless communication is performed between elevator cars. Background Art

[0002] For example, in a building with multiple floors such as a residential complex, an elevator is sometimes used to move between the multiple floors. In addition, in the past, communication between elevator cars was generally performed through wired communication. On the other hand, attempts have been made to perform such communication through wireless communication rather than wired communication. In this case, in order to ensure the reliability of wireless communication, communication is sometimes performed by multiplexing.

[0003] Patent document 1 discloses a wireless transmission structure of an elevator. In the wireless transmission structure of the elevator, a wireless signal control unit includes: a position acquisition unit that discretely acquires the moving position of a moving body; a transmission quality collection unit that collects the transmission quality of transmission in a plurality of prepared transmission frequencies or transmission channels in the wireless transmission paths of N systems; and a combination setting unit that sets the optimal transmission frequency or transmission channel in the wireless transmission paths of N systems based on the moving position of the moving body acquired by the position acquisition unit and the transmission quality of each transmission frequency or each transmission channel in each wireless transmission path collected by the transmission quality collection unit.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2023-57247 Summary of the invention

[0007] However, after setting the optimal transmission frequency and channel in the wireless transmission path, when actually switching, at least a part of the wireless transmission path cannot be used during the switching, which causes a problem of reduced reliability of wireless communication.

[0008] An object of the present invention is to provide a wireless control device, a wireless control method, and an elevator control system that can easily ensure the reliability of wireless communication when switching transmission frequencies, channels, etc.

[0009] In order to solve the above-mentioned problems, the present invention provides a wireless control device for controlling wireless communication, wherein the wireless communication is multiplexed using a plurality of wireless transmission paths and is performed between a mobile body, the wireless control device comprising: a position acquisition unit for acquiring a mobile position of the mobile body; a transmission quality collection unit for collecting the relationship between the mobile position and the transmission quality for each of the plurality of wireless transmission paths; a combination setting unit for setting a combination of the wireless transmission path and a given parameter based on the transmission quality; and a switching unit for determining, in the wireless transmission path set by the combination setting unit, a timing for switching the parameters set by the combination setting unit, and switching the parameters set by the combination setting unit at this timing.

[0010] Here, the switching unit can switch parameters one by one. In this case, it is easy to ensure reliability during switching.

[0011] Furthermore, the switching unit can sequentially switch from the wireless transmission path with the lowest transmission quality. In this case, it is easier to ensure the reliability during the switching.

[0012] Furthermore, the switching unit can switch parameters when there are few users of the car. In this case, it is easy to switch when there are no users using the car.

[0013] Furthermore, the switching unit can switch the transmission frequency after confirming that there is no user in the car. In this case, the safety of the user can be ensured.

[0014] Furthermore, the switching unit can obtain the time when there are few users by performing machine learning on past usage records. In this case, it is easy to obtain the time when there are few users.

[0015] Furthermore, the moving body is an elevator car, and the switching unit can switch the parameters after moving the car to a floor with good transmission quality. In this case, it is easier to ensure reliability during switching.

[0016] In addition, the parameter can be set to any one of frequency, time, and code. In this case, the wireless transmission path can be multiplexed more easily.

[0017] In addition, the present invention provides a wireless control method for controlling wireless communication, which is multiplexed by using multiple wireless transmission paths and is performed between a mobile body, wherein a processor executes a program recorded in a memory to obtain a moving position of the mobile body, collects the relationship between the moving position and the transmission quality for each of the multiple wireless transmission paths, sets a combination of the wireless transmission path and given parameters based on the transmission quality, determines a timing for switching the set parameters in the set wireless transmission path, and switches the parameters set at the timing.

[0018] Furthermore, the present invention is an elevator control system having a car and a control device for controlling the operation of the car, wherein the control device comprises: a wireless control device for controlling wireless communication, the wireless communication being multiplexed by using a plurality of wireless transmission paths and being performed between the car and the wireless control device; the wireless control device comprises: a position acquisition unit for acquiring the moving position of the car; a transmission quality collection unit for collecting the relationship between the moving position and the transmission quality for each of the plurality of wireless transmission paths; a combination setting unit for setting a combination of the wireless transmission path and a given parameter based on the transmission quality; and a switching unit for determining the timing for switching the parameter set by the combination setting unit in the wireless transmission path set by the combination setting unit, and switching the parameter set by the combination setting unit at the timing. In this case, it is possible to provide an elevator control system that can easily ensure the reliability of wireless communication when switching the transmission frequency, channel, etc.

[0019] -Effects of the Invention-

[0020] According to the present invention, it is possible to provide a wireless control device, a wireless control method, and an elevator control system that can easily ensure the reliability of wireless communication when switching transmission frequencies, channels, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 (a) to (b) are diagrams showing a method of communicating between an elevator control device and a car.

[0022] Figure 2 This is a block diagram showing the functional configuration of an elevator control system to which the present embodiment is applied.

[0023] Figure 3 This is a diagram showing the hardware configuration of the control device.

[0024] Figure 4 (a) is a diagram showing a wireless transmission path used in this embodiment. (b) is a diagram showing signal quality (transmission quality) of wireless communication.

[0025] Figure 5 (a) indicates that the transmission frequency used for the wireless transmission path is relative to Figure 4 (b) is a diagram showing the signal quality (transmission quality) of wireless communication in the case of (a).

[0026] Figure 6 This is a flowchart illustrating a method of setting a combination of a wireless transmission path and a transmission frequency.

[0027] Figure 7 It is a sequence diagram showing the processing performed by the wireless signal control unit of the control device and the wireless signal control unit of the car.

[0028] Figure 8It is detailed description Figure 7 A flowchart of the process of S701.

[0029] Fig. 9 It is detailed description Figure 6 A flowchart of the process of S605 is shown.

[0030] Fig.10 This is a flowchart for explaining the processing performed when the switching unit switches the transmission frequency.

[0031] -Description of Reference Numerals-

[0032] 1… elevator control system, 100… control device, 110… elevator control unit, 120, 220… wireless signal control unit, 121… position acquisition unit, 122… transmission quality collection unit, 123… combination setting unit, 124… switching unit, 125… input / output unit, 131 to 134, 231 to 234… antenna, 200… car, 210… car side control unit, Da to Dd… wireless transmission path DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0034] <Overall Description of Elevator Control System 1>

[0035] Figure 1 (a) to (b) are diagrams showing a method of communicating between the elevator control device 100 and the car 200.

[0036] in, Figure 1 (a) is a conventional method, which shows a case where wired communication is performed between the elevator control device 100 and the car 200. Figure 1 As shown in (a), the control device 100 and the car 200 are connected by a tail rope Tc, and signals are exchanged via the tail rope Tc.

[0037] In contrast, Figure 1 (b) is a method of applying this embodiment, which shows a case where wireless communication is performed between the elevator control device 100 and the car 200. Figure 1 As shown in (b) , an antenna 130 and an antenna 230 are provided on the control device 100 side and the car 200, respectively, and signals are exchanged between the antenna 130 and the antenna 230 by wireless communication.

[0038] As actual signals, the control device 100 transmits control information for raising and lowering, information indicating floors with calls, display control information on indicators, etc. to the car 200. The car 200 transmits operation information of buttons operated by elevator users, etc. to the control device 100.

[0039] exist Figure 1 In the wired communication of (a), especially in high-rise buildings, the tail rope Tc becomes longer, and the manufacturing cost and maintenance cost increase. Figure 1 In wireless communication such as (b), the tail cord Tc can be removed, and the manufacturing cost and maintenance cost can be reduced.

[0040] However, in an elevator, wireless communication needs to be performed in a lift channel where the car 200 is lifted and lowered. When wireless communication is performed in the lift channel, the wireless communication may become unstable due to reflection of radio waves in the lift channel. Therefore, in this embodiment, multiplexing is performed using a plurality of wireless transmission paths to reduce this problem.

[0041] Figure 2 This is a block diagram showing the functional configuration of an elevator control system 1 to which the present embodiment is applied.

[0042] The elevator control system 1 includes a control device 100 that controls the entire elevator control system 1 and a car 200 that is an example of a moving body. Figure 1 Wireless communication is performed as described in (b) of FIG.

[0043] The control device 100 mainly controls the operation and wireless communication of the car 200. The control device 100 includes an elevator control unit 110 and a wireless signal control unit 120.

[0044] The elevator control unit 110 controls the operation of the car 200. Specifically, when there is a call from a user, the car 200 moves to the floor where the call is made. Also, when a user presses a button for a destination floor in the car 200, the car 200 moves to the destination floor.

[0045] The wireless signal control unit 120 is an example of a wireless control device, and controls wireless communication with the car 200. In the present embodiment, wireless communication is multiplexed by using a plurality of wireless transmission paths. Each wireless transmission path is formed by a group of antennas. As described in detail later, a group of antennas is formed by forming a wireless transmission path between an antenna provided on the control device 100 side and an antenna provided on the car 200 to perform wireless communication. In the present embodiment, four systems of wireless transmission paths are formed by four groups of antennas, and multiplexing is achieved by exchanging the same information.

[0046] The wireless signal control unit 120 includes a position acquisition unit 121 , a transmission quality collection unit 122 , a combination setting unit 123 , a switching unit 124 , and an input / output unit 125 .

[0047] The position acquisition unit 121 acquires the moving position of the car 200. The moving position of the car 200 does not need to be obtained continuously, but is obtained discretely in the present embodiment. As the discrete moving position, the position of the floor where the car 200 stops can be used.

[0048] The transmission quality collection unit 122 collects the relationship between the movement position and the transmission quality for each of the plurality of wireless transmission paths. In the present embodiment, for example, the relationship between the position of the floor where the car 200 stops and the transmission quality is collected.

[0049] The combination setting unit 123 sets a combination of a wireless transmission path and a means for multiplexing wireless communications based on the transmission quality. The means for multiplexing differs depending on the multiplexing method. For example, in the frequency division multiplexing method, the frequency is changed for multiplexing, so it is the frequency. In addition, in the time division multiplexing method, the time is changed for multiplexing, so it is the time. Furthermore, in the code division multiplexing method, the code is changed for multiplexing, so it is the code. The combination setting unit 123 sets the wireless transmission path and the means for multiplexing, so it sets the combination of the wireless transmission path and the switching parameter. In this case, the parameter is any one of the frequency, time, and code. In the present embodiment, the means for multiplexing is the frequency multiplexing method, and the parameter for switching is the transmission frequency.

[0050] In this embodiment, in order to multiplex wireless communication, the transmission frequency is changed in each wireless transmission path. That is, the means for multiplexing is the transmission frequency. Therefore, the combination setting unit 123 sets the combination of the wireless transmission path and the transmission frequency based on the transmission quality. In addition, in order to multiplex wireless communication, the channel can also be changed in each wireless transmission path. In this case, the means for multiplexing can also be said to be the channel.

[0051] The switching unit 124 determines the timing of switching the set parameter. In the present embodiment, the parameter to be switched is the transmission frequency, so the switching unit 124 switches the transmission frequency in each wireless transmission path at the timing. This can also be said that the switching unit 124 changes the transmission frequency assigned to each wireless transmission path according to the set combination at the determined timing. The determined timing is the date and time of switching the transmission frequency. As described in detail later, the switching unit 124 determines, for example, a time when there are no users of the elevator and switches the transmission frequency at that time.

[0052] The input / output unit 125 performs input / output of information with the car 200 through wireless communication. As described above, at this time, information is multiplexed and transmitted / received.

[0053] The car 200 includes a car-side control unit 210 and a wireless signal control unit 220 .

[0054] The car-side control unit 210 controls information exchange with the control device 100. When a user presses a button for a destination floor in the car 200, the car-side control unit 210 transmits the operation information to the control device 100. The car-side control unit 210 can also transmit floor information, which is information on the floor where the car stops, to the control device 100.

[0055] The wireless signal control unit 220 controls wireless communication with the control device 100 .

[0056] Figure 3 It is a diagram showing the hardware configuration of the control device 100 .

[0057] The control device 100 shown in the figure includes a processor 11 such as a CPU (Central Processing Unit) for controlling each part by executing a program, an internal memory 12 for storing system data and internal data, an external memory 13 as an auxiliary storage device, and a communication module 14 for communicating with an external device.

[0058] The processor 11 executes programs such as OS (basic software) and application software.

[0059] In the present embodiment, the internal memory 12 is a semiconductor memory. The internal memory 12 includes a ROM (Read Only Memory) storing BIOS (Basic Input Output System) and the like and a RAM (Random Access Memory) used as a main storage device. The processor 11 uses the RAM as a program work space.

[0060] The external memory 13 is a storage device such as a HDD (Hard Disk Drive) or a SSD (Solid State Drive), and stores firmware, application software, and the like.

[0061] The communication module 14 is a communication interface for communicating with the car 200 .

[0062] <Description of wireless transmission paths Da to Dd>

[0063] Figure 4 (a) is a diagram showing wireless transmission paths Da to Dd used in this embodiment.

[0064] As described above, wireless communication is performed by forming a wireless transmission path between an antenna provided on the control device 100 side and an antenna provided on the car 200 as a group of antennas. In the figure, the antenna provided on the control device 100 side is illustrated as antennas 131 to 134, and the antenna provided on the car 200 is illustrated as antennas 231 to 234. Antennas 131 to 134 are installed on the ceiling of the elevator passage, for example. In addition, antennas 231 to 234 are installed on the upper part of the car 200. As a result, antennas 131 to 134 and antennas 231 to 234 are located opposite to each other in the elevator passage. However, there is no particular limitation on the position of installing each antenna as long as wireless communication is ensured. For example, antennas 131 to 134 may be installed at the lowest part of the elevator passage, and antennas 231 to 234 may be installed at the lower part of the car 200.

[0065] In this case, the wireless transmission path Da is formed by the antenna 131 and the antenna 231. Similarly, the wireless transmission path Db is formed by the antenna 132 and the antenna 232. Furthermore, the wireless transmission path Dc is formed by the antenna 133 and the antenna 233, and the wireless transmission path Dd is formed by the antenna 134 and the antenna 234. In the wireless transmission paths Da to Dd, multiplexing is achieved by exchanging the same information. In other words, here, four systems of wireless transmission paths composed of four groups of antennas are formed, and multiplexing is achieved by exchanging the same information.

[0066] In this embodiment, multiplexing is achieved by making the transmission frequencies different in the wireless transmission paths Da to Dd. In the wireless transmission paths Da to Dd, the transmission frequencies used are 2.4 GHz band, 5.2 GHz band, 5.3 GHz band, and 5.6 GHz band, respectively. In the figure, they are illustrated as W24, W52, W53, and W56. Here, it is shown that information is transmitted from the car 200 to the control device 100 via the wireless transmission paths Da to Dd. In addition, the wireless transmission paths Da to Dd are capable of bidirectional communication. Therefore, it is also possible to transmit information from the control device 100 to the car 200 via the wireless transmission paths Da to Dd.

[0067] Figure 4 (b) is a graph showing the signal quality (transmission quality) of wireless communication.

[0068] exist Figure 4 In (b), the horizontal axis represents the distance of the car 200 from the ceiling of the elevator shaft. This can also be considered as the distance between the antennas 131 to 134 and the antennas 231 to 234. In addition, the vertical axis represents the signal quality, and the larger the value, the better the signal quality. The signal quality can be represented by, for example, the reception strength, the error rate of the received data, etc.

[0069] In the figure, the signal quality of the wireless transmission paths Da to Dd is shown respectively. As shown in the figure, the greater the distance between the car 200 and the ceiling of the lifting channel, the lower the signal quality. Moreover, the signal quality is usually the lowest in the lowest layer. On the other hand, when performing wireless communication, there is a minimum required signal quality. In the figure, it is illustrated as the required signal quality TH1. In the case where there is a wireless transmission path that does not meet the required signal quality TH1, the wireless transmission path is not used. In other words, the number of wireless transmission paths used in multiplexing decreases and the reliability decreases. That is, at the lowest layer, it is preferred that the signal qualities of the wireless transmission paths Da to Dd are all above the required signal quality TH1. In addition, at the lowest layer, it is preferred that the difference Δ between the signal quality of the wireless transmission paths Da to Dd and the required signal quality TH1 is larger.

[0070] The signal quality varies depending on the transmission frequency used in the wireless transmission paths Da to Dd.

[0071] Figure 5 (a) means relative to Figure 4 (a) is a diagram showing a case where the transmission frequency used in the wireless transmission paths Da to Dd is changed.

[0072] Here, the case where the transmission frequencies used for the wireless transmission paths Da to Dd are 5.6 GHz band, 5.3 GHz band, 2.4 GHz band, and 5.2 GHz band, respectively, is shown. In the figure, these are shown as W56, W53, W24, and W52.

[0073] Figure 5 (b) means Figure 5 Graph of the signal quality (transmission quality) of wireless communication in the case of (a).

[0074] exist Figure 4 In (b), the signal quality of the wireless transmission path Dd using W56 is the worst, but Figure 5 In (b), the signal quality of the wireless transmission path Db using W52 is the worst.

[0075] In this way, the signal quality changes according to the combination of the wireless transmission paths Da to Dd and the transmission frequency. In addition, the signal quality sometimes changes according to the time period, resulting in changes over the years. Therefore, as a combination of wireless transmission paths Da to Dd and transmission frequencies, even if a given combination is the best at a certain point in time, it may not necessarily be maintained. Therefore, in this embodiment, the combination of wireless transmission paths Da to Dd and transmission frequencies is changed at each predetermined period (for example, every day) or when the signal quality of wireless communication decreases, so as to maintain the signal quality of wireless communication.

[0076] <Description of the method for setting the combination of wireless transmission paths Da to Dd and transmission frequencies>

[0077] Next, a method of setting a combination of wireless transmission paths Da to Dd and transmission frequencies will be described.

[0078] Figure 6 This is a flowchart for explaining a method of setting a combination of wireless transmission paths Da to Dd and transmission frequencies.

[0079] First, the elevator control unit 110 moves the car 200 from the uppermost floor to the lowermost floor while measuring the signal quality (S601).

[0080] At this time, the switch unit 124 changes the antenna / transmission frequency combination (S602). In other words, the switch unit 124 changes the combination of the wireless transmission paths Da to Dd and the transmission frequency.

[0081] Furthermore, at this time, the position acquisition unit 121 acquires the movement position of the car 200 (S603).

[0082] Furthermore, at this time, the transmission quality collection unit 122 collects the relationship between the moving position and the signal quality for each of the plurality of wireless transmission paths (S604). Figure 4 (b) Figure 5 In addition, when the position of the car 200 can only be obtained discretely, the relationship between the discretely obtained position of the car 200 and the signal quality is interpolated. Figure 4 (b) Figure 5 The continuous relationship shown in (b).

[0083] Then, the combination setting unit 123 determines a combination of antennas and transmission frequencies that satisfies the required signal quality TH1 (S605). That is, the combination setting unit 123 determines a combination of a wireless transmission path and a transmission frequency that satisfies the required signal quality TH1.

[0084] Next, the switch unit 124 determines the timing for switching the transmission frequency according to the set combination ( S606 ).

[0085] Furthermore, the switch unit 124 switches to the transmission frequency used in each of the wireless transmission paths Da to Dd at the determined timing (S607).

[0086] Figure 7 It is a sequence diagram showing the processing performed by the wireless signal control unit 120 of the control device 100 and the wireless signal control unit 220 of the car 200.

[0087] The wireless signal control unit 120 captures the elevator signal, estimates the moving position of the car 200, and measures the signal quality (S701). The elevator signal is a signal wirelessly transmitted from the car 200, and includes a door zone signal. The door zone signal is a signal indicating that the car 200 is located in a door zone where the door of the car 200 can be opened when the car 200 is raised or lowered in the elevator shaft. Based on the door zone signal, information on the time when the car 200 starts moving and the time when the movement ends is obtained. In addition, the wireless signal control unit 120 can also obtain floor information indicating the floor where the car 200 moves.

[0088] Then, the wireless signal control unit 120 determines, based on the movement position of the car 200, that the car 200 has moved from the uppermost floor to the lowermost floor (S702).

[0089] Furthermore, the wireless signal control unit 120 changes the antenna / transmission frequency combination (S703). In other words, the wireless transmission paths Da to Dd and the transmission frequency combination are changed.

[0090] Next, the wireless signal control unit 120 notifies the car 200 of the change information as information on the combination of the antenna and the transmission frequency (S704).

[0091] The wireless signal control unit 220 changes the antenna / transmission frequency combination according to the change information (S705). As a result, the antenna / transmission frequency combination is made the same in each of the wireless transmission paths Da to Dd.

[0092] Figure 8 It is a detailed description Figure 7 A flowchart of the process of S701.

[0093] The wireless signal control unit 120 obtains the movement start time and movement stop time of the car 200 based on the door zone signal included in the elevator signal, and further estimates the floor (layer) at which the movement starts and the floor (layer) at which the movement stops based on the floor information (S801).

[0094] Next, the wireless signal control unit 120 calculates the relationship between time and the position of the car 200 based on the movement characteristics of the elevator (S802). The movement characteristics of the elevator are, for example, the speed of the car 200. The wireless signal control unit 120 can obtain the position of the car 200 by converting the speed of the car 200 into a distance.

[0095] Furthermore, the wireless signal control unit 120 obtains information on the relationship between time and signal quality, i.e., time-signal quality information, and calculates the relationship between the moving position and signal quality of the car 200 (S803). In other words, the wireless signal control unit 120 extracts the moving position and signal quality corresponding to the same time, associates the two, and thereby obtains the relationship between the moving position and signal quality of the car 200.

[0096] Fig. 9 It is detailed description Figure 6 A flowchart of the process of S605 is shown.

[0097] First, the combination setting unit 123 obtains the relationship between the movement position of the car 200 and the signal quality for all combinations of antennas and transmission frequencies, and calculates the difference Δ from the required signal quality TH1 (S901).

[0098] Next, the combination setting unit 123 extracts the case where the difference Δ is the smallest for all combinations of antennas and transmission frequencies (S902). Figure 4 (b) Figure 5 As shown in (b), this becomes the difference Δ of the lowest floor. On the other hand, there is also a case where the difference Δ is the smallest on the middle floor. However, in order to simplify the description below, the case where the difference Δ is the smallest on the lowest floor will be described.

[0099] Furthermore, the combination setting unit 123 searches for the combination of antenna / cycle number of transmission waves with the largest difference Δ in the lowest layer (S903).

[0100] Then, the combination setting unit 123 uses the antenna / frequency combination to determine the final antenna / transmission frequency allocation (S904).

[0101] <Explanation of how to switch the transmission frequency by setting combination>

[0102] When the switching unit 124 switches the transmission frequency by the set combination, it is necessary to switch more safely. In other words, when switching, wireless communication cannot be performed in the wireless transmission path that becomes the target, so the number of systems is reduced and the reliability of wireless communication is reduced. Therefore, it is necessary to switch without reducing the reliability of wireless communication.

[0103] Furthermore, for example, when a user uses an elevator, switching the transmission frequency may cause the user to use the elevator in a state where the reliability of wireless communication is reduced, which is not preferable.

[0104] Therefore, in this embodiment, the transmission frequency is switched by adopting at least one of the following methods (1) to (3).

[0105] (1) The switching unit 124 switches the transmission frequencies one by one.

[0106] When multiple transmission frequencies are switched at the same time, multiple wireless transmission paths cannot be used during the switching. For example, when all the transmission frequencies of the wireless transmission paths Da to Dd of the four systems are switched at the same time, wireless communication cannot be used at all from the start time to the end time of the switching. Therefore, the switching unit 124 switches the transmission frequencies one by one to minimize the reduction in the reliability of wireless communication.

[0107] Furthermore, at this time, the switching unit 124 switches sequentially from the wireless transmission path with low signal quality. In other words, it is difficult to maintain a state in which wireless communication is possible for a wireless transmission path with lower signal quality, but it is easy to maintain a state in which wireless communication is possible for a wireless transmission path with higher signal quality. Therefore, the switching unit 124 easily maintains a state in which wireless communication is possible by switching sequentially from the wireless transmission path with low signal quality. Furthermore, for the wireless transmission path with lower signal quality, it is possible to sequentially switch to a state in which the signal quality is higher.

[0108] (2) The switching unit 124 switches the transmission frequency when there are few users of the car 200.

[0109] If the number of users of the car 200 is small, it is easy to switch when there are no users. In addition, the switching unit 124 confirms that there are no users in the car 200 and switches the transmission frequency. As a method of confirming that there are no users in the car 200, there is a method of determining by a weight sensor that detects the weight of the car 200. In addition, when there is no operation of a button in the car 200 within a predetermined time (for example, 3 minutes) from the last use of the car 200, the switching unit 124 can determine that there are no users in the car 200.

[0110] The switching unit 124 can obtain the time when there are few users by performing machine learning on the past usage records. In other words, the switching unit 124 performs machine learning on the relationship between the date and time and the past usage records to predict the date and time when there are few users.

[0111] (3) The switching unit 124 switches the transmission frequency after the car 200 moves to a floor with good signal quality.

[0112] If the transmission quality of the car 200 is good, the reliability of wireless communication can be ensured. In addition, the switching time can be shortened. Figure 4 (b) Figure 5 As shown in (b), it is usually the top floor. However, it is not limited to this. When the transmission quality of the intermediate floor is the best, move to that floor and switch the transmission frequency.

[0113] Fig.101 is a flowchart for explaining the process performed when the switching unit 124 switches the transmission frequency.

[0114] Fig.10 It is a detailed description Figure 6 A flowchart of the process of S606 is shown in FIG.

[0115] First, the switching unit 124 selects a wireless transmission path with the lowest signal quality ( S1001 ).

[0116] Then, the switching unit 124 moves the car 200 to a floor having the best signal quality among the wireless transmission paths other than the selected wireless transmission path (S1002).

[0117] Then, the switching unit 124 switches the transmission frequency of the selected wireless transmission path ( S1003 ).

[0118] Next, the switching unit 124 determines whether a new call from an elevator user has occurred (S1004).

[0119] As a result, when no new call occurs (S1004: No), the switching unit 124 determines whether the switching of the transmission frequency has been completed for all the wireless transmission paths Da to Dd (S1005).

[0120] Then, when the switching of the transmission frequencies has not been completed for all the wireless transmission paths (S1005: No), the wireless transmission path with the next lowest signal quality is selected (S1006), and the process returns to S1003.

[0121] On the other hand, when the switching of the transmission frequencies is completed for all the wireless transmission paths Da to Dd (S1005: Yes), a series of processing is terminated.

[0122] Furthermore, when a new call is generated in S1004 (S1004: Yes), the switching unit 124 determines whether a request for changing the transmission frequency has been transmitted to the car 200 (S1007).

[0123] As a result, when a change request has been sent (S1007: Yes), the user's call service is executed (S1008). In this case, the user's call service is implemented at the changed transmission frequency.

[0124] Then, the call service is terminated (S1009) and the process moves to S1005.

[0125] In addition, in S1006, if the change request has not been sent (S1007: Yes), the transmission frequency change operation is interrupted (S1010). Then, the user's call service is executed (S1011). In this case, the user's call service is implemented with the transmission frequency before the change.

[0126] Then, the call service is terminated (S1012) and the process moves to S1003.

[0127] In the above embodiment, there is one elevator, but there may be more than one elevator. In addition, there are four wireless transmission paths, but the number may be any number as long as there are more than one wireless transmission paths.

[0128] In addition, in the above-mentioned manner, the car 200 is shown as a moving body, but the moving body is not limited to this. That is, as long as the moving body moving on a predetermined path performs wireless communication with the fixed side, it can be applied to other moving bodies. For example, it can also be applied to the case where a conveying device moving on a predetermined path in a warehouse performs wireless communication with a conveying device control device. In addition, for example, it can also be applied to the case where a railway vehicle is used as a moving body and wireless communication is performed between the railway vehicle and the driving instruction station.

[0129] According to the above-mentioned method, it is possible to provide a wireless control device, a wireless control method, and an elevator control system that can easily ensure the reliability of wireless communication when switching transmission frequencies, channels, etc. As a result, it is easier to ensure safety when switching transmission frequencies, channels, etc. In addition, according to the above-mentioned method, when switching transmission frequencies, channels, etc., it can be so-called automatically performed, and there is no need for an operator to manually search for appropriate transmission frequencies, channels, etc. for each wireless transmission path Da to Dd.

[0130] <Description of wireless control method>

[0131] The processing performed by the wireless signal control unit 120 described above is realized by the cooperation of software and hardware resources. That is, the processor inside the computer provided in the wireless signal control unit 120 loads the software realizing the above functions into the memory and executes it, thereby realizing these functions.

[0132] Therefore, the processing performed by the wireless signal control unit 120 can be understood as the following wireless control method, which is a wireless control method for controlling wireless communication, wherein the wireless communication is multiplexed by using multiple wireless transmission paths, so as to be carried out between a mobile body, and the processor executes a program recorded in a memory to obtain the moving position of the mobile body, collects the relationship between the moving position and the transmission quality for each of the multiple wireless transmission paths, sets the combination of the wireless transmission path and given parameters based on the transmission quality, determines the timing for switching the set parameters in the set wireless transmission path, and switches the parameters set at the timing.

[0133] Although the present embodiment has been described above, the technical scope of the present invention is not limited to the scope described in the above embodiment. As can be seen from the description of the claims, various changes or improvements made to the above embodiment are also included in the technical scope of the present invention.

Claims

1. A wireless control device that controls wireless communication, the wireless communication being performed with a moving body by multiplexing using a plurality of wireless transmission paths, The wireless control device is characterized by comprising: A position acquisition unit that acquires a moving position of the moving body; A transmission quality collecting unit, for collecting the relationship between the mobile position and the transmission quality for each of the plurality of wireless transmission paths; a combination setting unit, which sets a combination of the wireless transmission path and a given parameter based on the transmission quality; as well as The switching unit determines a timing for switching the parameters set by the combination setting unit in the wireless transmission path set by the combination setting unit, and switches the parameters set by the combination setting unit at the timing.

2. The wireless control device according to claim 1, wherein: The switching section switches the parameters one by one.

3. The wireless control device according to claim 2, wherein: The switching unit switches sequentially from the wireless transmission path having the lowest transmission quality.

4. The wireless control device according to claim 1, wherein: The switching unit switches the parameter when there are few users of the car.

5. The wireless control device according to claim 4, wherein: The switching unit switches the parameter after confirming that there is no user in the car.

6. The wireless control device according to claim 4, wherein: The switching unit obtains a time when there are few users by performing machine learning on past usage records.

7. The wireless control device according to claim 1, wherein: The moving body is an elevator car, The switching unit switches the parameter after moving the car to the floor with good transmission quality.

8. The wireless control device according to claim 1, wherein: The parameter is any one of frequency, time and code.

9. A wireless control method for controlling wireless communication, the wireless communication being performed with a moving body by multiplexing using a plurality of wireless transmission paths, The wireless control method is characterized in that: The processor executes the program recorded in the memory, obtaining the moving position of the moving body, collecting the relationship between the mobile position and the transmission quality for each of the plurality of wireless transmission paths, setting a combination of the wireless transmission path and given parameters based on the transmission quality, In the set wireless transmission path, the timing for switching the set parameters is determined, and the parameters set at the timing are switched.

10. An elevator control system comprising a car and a control device for controlling the operation of the car, The elevator control system is characterized in that: The control device comprises: a wireless control device for controlling wireless communication, wherein the wireless communication is multiplexed using a plurality of wireless transmission paths and is performed between the car and the control device; The wireless control device comprises: A position acquisition unit for acquiring a moving position of the car; A transmission quality collecting unit, for collecting the relationship between the mobile position and the transmission quality for each of the plurality of wireless transmission paths; a combination setting unit, which sets a combination of the wireless transmission path and a given parameter based on the transmission quality; as well as The switching unit determines a timing for switching the parameters set by the combination setting unit in the wireless transmission path set by the combination setting unit, and switches the parameters set by the combination setting unit at the timing.

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