Wireless control device, wireless control method, and elevator control system

Abstract

To make it 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 transmission frequencies, channels, or the like are switched.SOLUTION: A wireless control device that controls wireless communication with an elevator car 200, multiplexed by using a plurality of wireless transmission paths. The wireless control device includes: a position acquisition unit 121 that acquires a moving position of the elevator car 200; a transmission quality collection unit 122 that collects a relationship between the moving position and 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 based on the transmission quality; and a switching unit 124 that determines a timing for switching the parameter set by the combination setting unit 123 in the wireless transmission path set by the combination setting unit 123 and switches the parameter set by the combination setting unit 123 at the timing.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a wireless control device, a wireless control method, and an elevator control system, and more particularly to a wireless control device and the like that can be suitably used when performing wireless communication with an elevator car. [Background technology]

[0002] For example, in a multi-story building such as an apartment building, elevators are often used to move between the multiple floors. Conventionally, wired communication has been used to communicate with the elevator car. However, attempts have been made to use wireless communication instead of wired communication. In this case, communication may be multiplexed to ensure the reliability of wireless communication.

[0003] Patent Document 1 discloses a wireless transmission configuration for an elevator. In this wireless transmission configuration for an elevator, a wireless signal control unit includes a position acquisition unit that discretely acquires the moving position of a moving object, a transmission quality collection unit that collects transmission quality during transmission at a plurality of prepared transmission frequencies or transmission channels in N wireless transmission paths, and a combination setting unit that sets an optimal transmission frequency or transmission channel in the N wireless transmission paths based on the moving position of the moving object acquired by the position acquisition unit and the transmission quality in each transmission frequency or each transmission channel in each wireless transmission path collected by the transmission quality collection unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-57247 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, after setting the optimal transmission frequency or channel for the wireless transmission path, when the wireless transmission path is actually switched, 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. 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. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a wireless control device that controls wireless communication between a mobile body and a wireless transmission path that is multiplexed by using multiple wireless transmission paths, and includes a position acquisition unit that acquires the moving position of the mobile body, a transmission quality collection unit that collects the relationship between the moving position and the transmission quality for each of the multiple wireless transmission paths, a combination setting unit that sets a combination of the wireless transmission path and a specified parameter based on the transmission quality, and a switching unit that determines the 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 that timing.

[0007] Here, the switching unit can switch the parameters one by one, which makes it easier to ensure reliability during switching. Furthermore, the switching unit can switch wireless transmission paths in ascending order of transmission quality, which makes it easier to ensure reliability during switching. Furthermore, the switching unit can switch the parameters at a time when there are few passengers in the car. In this case, the switching can be easily performed when the car is not being used by passengers. Furthermore, the switching unit can switch the transmission frequency when it is confirmed that there is no user in the car, thereby ensuring the safety of users. The switching unit can also determine the time when there are fewer users by machine learning past usage records. In this case, it becomes easier to determine the time when there are fewer users. Furthermore, the moving body may be an elevator car, and the switching unit may switch the parameters after moving the elevator car to a floor with good transmission quality. In this case, reliability during switching can be further ensured. Furthermore, the parameter can be any one of frequency, time, and code, which makes it easier to multiplex wireless transmission paths.

[0008] The present invention also provides a wireless control method for controlling wireless communication between a mobile body and the mobile body, which is multiplexed by using multiple wireless transmission paths, in which a processor executes a program recorded in a memory to obtain the moving position of the mobile body, collect the relationship between the moving position and the transmission quality for each of the multiple wireless transmission paths, set a combination of the wireless transmission path and a specified parameter based on the transmission quality, determine the timing for switching the set parameters in the set wireless transmission path, and switch the set parameters at that timing.

[0009] Furthermore, the present invention provides an elevator control system having a car and a control device for controlling the operation of the car, the control device being multiplexed by using a plurality of wireless transmission paths and including a wireless control device for controlling wireless communication between the car and the control device, the wireless control device including a position acquisition unit for acquiring a moving position of the car, a transmission quality collection unit for collecting a 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 predetermined parameter based on the transmission quality, and a switching unit for determining a timing for switching the parameters set by the combination setting unit in the wireless transmission path set by the combination setting unit and switching the parameters set by the combination setting unit at the timing. In this case, an elevator control system can be provided that can easily ensure the reliability of wireless communication when switching a transmission frequency, a channel, or the like. Effect of the Invention

[0010] 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 a transmission frequency, a channel, or the like. [Brief description of the drawings]

[0011] [Figure 1] 1(a) and 1(b) are diagrams showing a form of communication between an elevator control device and a car. [Diagram 2] 1 is a block diagram showing a functional configuration of an elevator control system to which the present embodiment is applied. [Diagram 3] FIG. 2 is a diagram illustrating a hardware configuration of a control device. [Figure 4] 1A is a diagram showing a wireless transmission path used in the present embodiment, and FIG. 1B is a diagram showing signal quality (transmission quality) of wireless communication. [Diagram 5] 4(a) is a diagram showing a case where the transmission frequency used for the wireless transmission path is changed from that in FIG. 4(a), and FIG. 4(b) is a diagram showing the signal quality (transmission quality) of wireless communication in the case of (a). [Figure 6] 11 is a flowchart illustrating a method for setting a combination of a wireless transmission path and a transmission frequency. [Figure 7] 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. [Figure 8] 8 is a flowchart illustrating the process of S701 in FIG. 7 in detail. [Figure 9] 7 is a flowchart illustrating the process of S605 in FIG. 6 in detail. [Figure 10] 11 is a flowchart illustrating a process performed by a switching unit to switch a transmission frequency. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0013] <Overall explanation of elevator control system 1> 1(a) and 1(b) are diagrams showing a form of communication between an elevator control device 100 and a car 200. FIG. Of these, Fig. 1(a) shows a conventional method in which wired communication is performed between an elevator control device 100 and a car 200. As shown in Fig. 1(a), the control device 100 and the car 200 are connected by a tail cord Tc, and signals are exchanged via the tail cord Tc. In contrast, Fig. 1(b) shows a system to which this embodiment is applied, in which wireless communication is performed between an elevator control device 100 and a car 200. As shown in Fig. 1(b), an antenna 130 and an antenna 230 are installed 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. As actual signals, the control device 100 transmits to the car 200 information on control of lifting and lowering, information on the floor for which a call has been made, display control information on a display device, etc. The car 200 transmits to the control device 100 information on the operation of a button operated by an elevator user, etc.

[0014] In the wired communication shown in Fig. 1(a), the tail cord Tc becomes long, especially in high-rise buildings, and manufacturing and maintenance costs increase. In contrast, in the wireless communication shown in Fig. 1(b), the tail cord Tc can be eliminated, and manufacturing and maintenance costs can be reduced. However, in an elevator, wireless communication must be performed within the hoistway where the car 200 ascends and descends. When wireless communication is performed within the hoistway, the wireless communication may become unstable due to the reflection of radio waves within the hoistway. Therefore, in this embodiment, multiplexing is performed using multiple wireless transmission paths to reduce this problem.

[0015] FIG. 2 is a block diagram showing a functional configuration of an elevator control system 1 to which this embodiment is applied. 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. The control device 100 and the car 200 perform wireless communication as described in FIG. 1(b).

[0016] 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.

[0017] The elevator control unit 110 controls the operation of the car 200. Specifically, when there is a call from a user, the car 200 is moved 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 is moved to the destination floor. The wireless signal control unit 120 is an example of a wireless control device, and controls wireless communication with the car 200. In this embodiment, wireless communication is multiplexed by using multiple wireless transmission paths. Each wireless transmission path is formed by a pair of antennas. As will be described in detail later, one antenna installed on the control device 100 side and one antenna installed on the car 200 form one pair of antennas, and wireless communication is performed by forming a wireless transmission path between them. In this embodiment, four wireless transmission paths are formed by four pairs of antennas, and multiplexing is achieved by exchanging the same information.

[0018] The radio 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 . 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 continuously obtained, and is discrete in this embodiment. The discrete moving position may be the position of the floor where the car 200 stops.

[0019] The transmission quality collecting unit 122 collects the relationship between the moving position and the transmission quality for each of the multiple wireless transmission paths. In the present embodiment, for example, the relationship between the position of the floor where the elevator car 200 stops and the transmission quality is collected.

[0020] The combination setting unit 123 sets a combination of the wireless transmission path and the means used for multiplexing the wireless communication based on the transmission quality. The means used for multiplexing differs depending on the multiplexing method. For example, in the frequency division multiplexing method, the frequency is used because the frequency is changed for multiplexing. In the time division multiplexing method, the time is used because the time is changed for multiplexing. Furthermore, in the code division multiplexing method, the code is used because the code is changed for multiplexing. Since the combination setting unit 123 sets the means used for multiplexing with the wireless transmission path, it sets a combination of the wireless transmission path and the parameter to be switched. In this case, the parameter is one of the frequency, the time, and the code. In this embodiment, the means used for multiplexing is the frequency multiplexing method, and the parameter to be switched is the transmission frequency. In this embodiment, wireless communications are multiplexed by changing the transmission frequency for each wireless transmission path. That is, the means used 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. Note that, in order to multiplex wireless communications, the channel can also be changed for each wireless transmission path. In this case, it can also be said that the means used for multiplexing is the channel.

[0021] The switching unit 124 determines the timing for switching the set parameters. In this 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 this timing. This can also be said that the switching unit 124 changes the transmission frequency to the one assigned to each wireless transmission path in accordance with the set combination at the determined timing. The determined timing is the date and time for switching the transmission frequency. Although details will be described later, the switching unit 124 determines, for example, the time when there are no users in the elevator, and switches the transmission frequency at this time.

[0022] The input / output unit 125 inputs and outputs information to and from the car 200 by wireless communication. As described above, the information is multiplexed and transmitted / received.

[0023] The car 200 includes a car side control unit 210 and a radio signal control unit 220. The car-side control unit 210 controls the exchange of information with the control device 100. When a user presses a destination floor button in the car 200, the car-side control unit 210 sends the operation information to the control device 100. The car-side control unit 210 can also send floor information, which is information on the floor where the car stopped, to the control device 100. The radio signal control unit 220 controls radio communication with the control device 100 .

[0024] FIG. 3 is a diagram showing the hardware configuration of the control device 100. As shown in FIG. The illustrated control device 100 has a processor 11 such as a CPU (Central Processing Unit) that controls each part through the execution of a program, an internal memory 12 in which system data and internal data are stored, an external memory 13 as an auxiliary storage device, and a communication module 14 used for communication with external devices.

[0025] The processor 11 executes programs such as an OS (operating system) and application software. In this embodiment, the internal memory 12 is a semiconductor memory. The internal memory 12 has a ROM (Read Only Memory) in which a BIOS (Basic Input Output System) and the like are stored, and a RAM (Random Access Memory) used as a main storage device. The processor 11 uses the RAM as a work space for programs. The external memory 13 is a storage such as a hard disk drive (HDD) or a solid state drive (SSD), and stores firmware, application software, and the like. The communication module 14 is a communication interface for communicating with the car 200.

[0026] <Explanation of wireless transmission paths Da to Dd> FIG. 4(a) is a diagram showing wireless transmission paths Da to Dd used in this embodiment. As described above, one antenna installed on the control device 100 side and one antenna installed on the car 200 form a pair of antennas, and wireless communication is performed by forming a wireless transmission path between them. In the figure, the antennas installed on the control device 100 side are illustrated as antennas 131-134, and the antennas installed on the car 200 are illustrated as antennas 231-234. The antennas 131-134 are attached to the ceiling of the elevator shaft, for example. The antennas 231-234 are attached to the upper part of the elevator shaft. As a result, the antennas 131-134 and the antennas 231-234 are positioned opposite each other in the elevator shaft. However, the positions at which each antenna is attached are not particularly limited as long as wireless communication is ensured. For example, the antennas 131-134 may be attached to the lowest part of the elevator shaft, and the antennas 231-234 may be attached to the lower part of the elevator shaft.

[0027] In this case, antenna 131 and antenna 231 form a wireless transmission path Da. Similarly, antenna 132 and antenna 232 form a wireless transmission path Db. Furthermore, antenna 133 and antenna 233 form a wireless transmission path Dc, and antenna 134 and antenna 234 form a wireless transmission path Dd. The wireless transmission paths Da to Dd are multiplexed by exchanging the same information. That is, here, four wireless transmission paths are formed by four sets of antennas, and multiplexing is achieved by exchanging the same information.

[0028] In this embodiment, multiplexing is achieved by making the transmission frequencies different for each of the wireless transmission paths Da to Dd. The wireless transmission paths Da to Dd use transmission frequencies of 2.4 GHz, 5.2 GHz, 5.3 GHz, and 5.6 GHz, respectively. In the figure, these are illustrated as W24, W52, W53, and W56. Here, a case is shown in which information is transmitted from the car 200 to the control device 100 via the wireless transmission paths Da to Dd. Note that the wireless transmission paths Da to Dd are capable of two-way communication. Therefore, information can also be transmitted from the control device 100 to the car 200 via the wireless transmission paths Da to Dd.

[0029] FIG. 4(b) is a diagram showing the signal quality (transmission quality) of wireless communication. In Fig. 4(b), the horizontal axis indicates the distance from the ceiling of the elevator shaft of the car 200. This can also be considered as the distance between the antennas 131-134 and the antennas 231-234. The vertical axis indicates signal quality, with a higher value indicating better signal quality. Signal quality can be expressed, for example, by reception strength or an error occurrence rate of received data.

[0030] In the figure, the signal quality is shown for each of the wireless transmission paths Da to Dd. As shown in the figure, the signal quality decreases as the distance from the ceiling of the elevator shaft of the car 200 increases. And the signal quality is usually the lowest on the lowest floor. On the other hand, there is a minimum required signal quality for wireless communication. In the figure, this is shown as a required signal quality TH1. If there is a wireless transmission path that does not satisfy the required signal quality TH1, this wireless transmission path is not used. That is, the number of wireless transmission paths used for multiplexing decreases, and reliability decreases. That is, on the lowest floor, it is desirable that the signal quality of all the wireless transmission paths Da to Dd is equal to or higher than the required signal quality TH1. Also, on the lowest floor, it is desirable that the difference Δ between the signal quality of the wireless transmission paths Da to Dd and the required signal quality TH1 is larger.

[0031] The signal quality changes depending on the transmission frequency used in the wireless transmission paths Da to Dd. FIG. 5(a) is a diagram showing a case where the transmission frequencies used in the wireless transmission paths Da to Dd are changed from those in FIG. 4(a). Here, the case where the transmission frequencies of the 5.6 GHz band, 5.3 GHz band, 2.4 GHz band, and 5.2 GHz band are used for the wireless transmission paths Da to Dd, respectively, is shown. In the figure, these are illustrated as W56, W53, W24, and W52.

[0032] FIG. 5(b) is a diagram showing the signal quality (transmission quality) of the wireless communication in the case of FIG. 5(a). In FIG. 4(b), the signal quality of the wireless transmission path Dd using W56 is the worst, while in FIG. 5(b), the signal quality of the wireless transmission path Db using W52 is the worst. In this way, the signal quality changes depending on the combination of the wireless transmission paths Da to Dd and the transmission frequency. Furthermore, the signal quality also changes depending on the time of day, and may change over time. Therefore, even if a certain combination of the wireless transmission paths Da to Dd and the transmission frequency is the best at a certain point in time, this combination will not necessarily be maintained. Therefore, in this embodiment, the combination of the wireless transmission paths Da to Dd and the transmission frequency is changed at predetermined intervals (e.g., once a day) or when the signal quality of the wireless communication is degraded, in order to maintain the signal quality of the wireless communication.

[0033] <Explanation of how to set the combination of wireless transmission paths Da to Dd and transmission frequencies> Next, a method for setting combinations of the wireless transmission paths Da to Dd and the transmission frequencies will be described. FIG. 6 is a flowchart illustrating a method for setting combinations of wireless transmission paths Da to Dd and transmission frequencies. First, the elevator control unit 110 moves the car 200 from the top floor to the bottom floor while measuring the signal quality (S601). At this time, the switching unit 124 changes the combination of antennas / transmission frequencies (S602), that is, changes the combination of the wireless transmission paths Da to Dd and the transmission frequencies. At this time, the position acquisition unit 121 acquires the moving position of the car 200 (S603). Furthermore, at this time, the transmission quality collecting unit 122 collects the relationship between the moving position and the signal quality for each of the multiple wireless transmission paths (S604). As a result, the wireless communication signal quality shown in Fig. 4(b) or Fig. 5(b) can be acquired. If the position of the car 200 can only be acquired discretely, the discretely acquired relationship between the position of the car 200 and the signal quality is interpolated. As a result, a continuous relationship such as that shown in Fig. 4(b) or Fig. 5(b) can be obtained.

[0034] Then, the combination setting unit 123 determines a combination of antennas / 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. Next, the switching unit 124 determines the timing for switching the transmission frequency based on the set combination (S606). Furthermore, the switching unit 124 switches the transmission frequency to be used in each of the wireless transmission paths Da to Dd at the determined timing (S607).

[0035] FIG. 7 is a sequence diagram showing the processing performed by the radio signal control unit 120 of the control device 100 and the radio signal control unit 220 of the car 200. As shown in FIG. The wireless signal control unit 120 captures an elevator signal and measures the signal quality while estimating the moving position of the car 200 (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 moves up and down in the elevator shaft. The door zone signal provides information on the start time and end time of the car 200's movement. The wireless signal control unit 120 can also obtain floor information indicating the floor to which the car 200 has moved. Then, the wireless signal control unit 120 determines that the car 200 has moved from the top floor to the bottom floor based on the movement position of the car 200 (S702). Furthermore, the radio signal control unit 120 changes the combination of antennas / transmission frequencies (S703), that is, changes the combination of the radio transmission paths Da to Dd and the transmission frequencies. Next, the wireless signal control unit 120 notifies the car 200 of the change information as information on the combination of antenna / transmission frequency (S704). The radio signal control unit 220 changes the combination of antennas / transmission frequencies in accordance with the change information (S705), thereby making the combination of antennas / transmission frequencies the same for each of the radio transmission paths Da to Dd.

[0036] FIG. 8 is a flowchart illustrating the process of S701 in FIG. 7 in detail. The wireless signal control unit 120 determines the start time and stop time of the car 200 based on the door zone signal included in the elevator signal, and further estimates the floor (floor) where the car started to move and the floor (floor) where the car stopped to move based on the floor information (S801). Next, the wireless signal control unit 120 calculates the relationship between time and the position of the car 200 from 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. Furthermore, the wireless signal control unit 120 acquires time-signal quality information, which is information on the relationship between time and signal quality, and calculates the relationship between the moving position of the car 200 and the signal quality (S803). In other words, the wireless signal control unit 120 extracts the moving position and the signal quality corresponding to the same time, and associates the two to obtain the relationship between the moving position of the car 200 and the signal quality.

[0037] FIG. 9 is a flowchart illustrating the process of S605 in FIG. 6 in detail. First, the combination setting unit 123 acquires the relationship between the moving position of the car 200 and the signal quality for all combinations of antenna / transmission frequency, and calculates the difference Δ from the required signal quality TH1 (S901). Next, the combination setting unit 123 extracts the case where the difference Δ is smallest for all combinations of antennas / transmission frequencies (S902). As shown in Fig. 4(b) and Fig. 5(b), this is usually the difference Δ on the lowest floor. On the other hand, the difference Δ may be smallest on an intermediate floor. However, for simplicity of explanation, the following explanation will be given for the case where the difference Δ is smallest on the lowest floor. Furthermore, the combination setting unit 123 searches for the combination of antennas and frequencies that maximizes the difference Δ on the bottom floor (S903). Then, the combination setting unit 123 adopts this antenna / frequency combination and determines it as the final antenna / transmission frequency allocation (S904).

[0038] <Explanation of how to switch transmission frequencies according to the set combination> When the switching unit 124 switches the transmission frequency according to the set combination, it is necessary to perform the switching more safely. In other words, when switching, wireless communication is not possible in the target wireless transmission path, so the number of systems decreases and the reliability of wireless communication decreases. Therefore, it is necessary to perform the switching without decreasing the reliability of wireless communication as much as possible. Furthermore, for example, it is not preferable to switch the transmission frequency when a user is using an elevator, since the user will be using the elevator in a state in which the reliability of wireless communication is reduced. Therefore, in this embodiment, the transmission frequency is switched by adopting at least one of the following methods (1) to (3).

[0039] (1) The switching unit 124 switches the transmission frequencies one by one. When multiple transmission frequencies are switched simultaneously, multiple wireless transmission paths become unusable during the switching. For example, when all of the transmission frequencies of the four wireless transmission paths Da to Dd are switched simultaneously, wireless communication becomes completely unusable during the period 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 deterioration of the reliability of wireless communication. At this time, the switching unit 124 switches in order from the wireless transmission path with the lowest signal quality. That is, for a wireless transmission path with lower signal quality, it is difficult to maintain a state in which wireless communication is possible, but for a wireless transmission path with higher signal quality, it is easy to maintain a state in which wireless communication is possible. Therefore, by switching in order from the wireless transmission path with the lowest signal quality, the switching unit 124 is more likely to maintain a state in which wireless communication is possible. Also, for wireless transmission paths with lower signal quality, it is possible to sequentially switch to a state with higher signal quality.

[0040] (2) The switching unit 124 switches the transmission frequency during a time when there are few passengers in the elevator 200. If there are few users of the car 200 at the time, it is easy to perform switching when there are no users. Furthermore, the switching unit 124 confirms that there are no users in the car 200 and switches the transmission frequency. One method of confirming that there are no users in the car 200 is to judge by a weight sensor that detects the weight of the car 200. Furthermore, when there is no operation of the buttons in the car 200 for a predetermined time (e.g., 3 minutes) since the car 200 was last used, the switching unit 124 can judge that there are no users in the car 200. The switching unit 124 can find the time when there are few users by machine learning past usage records. That is, the switching unit 124 performs machine learning on the relationship between date and time and past usage records, and predicts a date and time when there are few users.

[0041] (3) The switching unit 124 moves the elevator 200 to a floor with good signal quality, and then switches the transmission frequency. If the car 200 is on a floor with good transmission quality, the reliability of wireless communication can be ensured to be high. Also, a reduction in switching time can be expected. As shown in Fig. 4(b) and Fig. 5(b), the floor where the transmission quality of the car 200 is the best is usually the top floor in many cases. However, this is not limited to this, and if the transmission quality is the best on an intermediate floor, the car moves to this floor and the transmission frequency is switched.

[0042] FIG. 10 is a flowchart illustrating the process performed by the switching unit 124 when switching the transmission frequency. FIG. 10 can also be said to be a flowchart explaining in detail the process of S606 in FIG. First, the switching unit 124 selects the wireless transmission path with the lowest signal quality (S1001). Then, the switching unit 124 moves the elevator car 200 to the floor with the best signal quality through a wireless transmission path other than the selected wireless transmission path (S1002). Then, the switching unit 124 switches the transmission frequency for the selected wireless transmission path (S1003).

[0043] Next, the switching unit 124 determines whether or not a new call has been made by an elevator user (S1004). As a result, if no new call has been generated (NO in S1004), the switching unit 124 determines whether or not switching of the transmission frequency has been completed for all of the wireless transmission paths Da to Dd (S1005). If the switching of the transmission frequency has not been completed for all wireless transmission paths (NO in S1005), the wireless transmission path with the next lowest signal quality is selected (S1006), and the process returns to S1003. On the other hand, if the switching of the transmission frequency has been completed for all the wireless transmission paths Da to Dd (YES in S1005), the series of processes ends.

[0044] Furthermore, when a new call has been generated in S1004 (YES in S1004), the switching unit 124 determines whether or not a request to change the transmission frequency has been transmitted to the car 200 (S1007). As a result, if the change request has been sent (YES in S1007), the call service by the user is executed (S1008). In this case, the call service by the user is executed with the changed transmission frequency. Then, the call service is completed (S1009), and the process proceeds to S1005.

[0045] If the change request has not yet been sent in S1006 (YES in S1007), the operation to change the transmission frequency is interrupted (S1010). Then, the call service by the user is executed (S1011). In this case, the call service by the user is executed with the transmission frequency before the change. Then, the call service is completed (S1012), and the process proceeds to S1003.

[0046] In the above embodiment, the elevator is one, but it may be multiple. Also, the wireless transmission paths are four, but the number of paths may be any number as long as there are multiple paths. In the above embodiment, the elevator 200 is shown as the moving body, but the moving body is not limited to this. That is, the present invention can be applied to other moving bodies as long as the moving body moving along a predetermined route and the fixed side perform wireless communication. For example, the present invention can be applied to a case where wireless communication is performed between a conveying device moving along a predetermined route in a warehouse and a conveying device control device. Also, for example, the present invention can be applied to a railway vehicle as the moving body, and wireless communication is performed between the railway vehicle and a train operation control center.

[0047] According to the above-mentioned embodiments, 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 a transmission frequency, a channel, etc. This makes it easier to ensure safety when switching a transmission frequency, a channel, etc. Furthermore, according to the above-mentioned embodiments, switching of a transmission frequency, a channel, etc. can be performed automatically, so that an operator does not need to manually search for a suitable transmission frequency, a channel, etc. for each of the wireless transmission paths Da to Dd.

[0048] <Explanation of wireless control method> The above-described processing performed by the radio signal control unit 120 is realized by the cooperation of software and hardware resources. That is, a processor in a computer provided in the radio signal control unit 120 loads software for realizing each of the above-described functions into memory, executes the software, and realizes each of these functions. Therefore, the processing performed by the wireless signal control unit 120 can be considered as a wireless control method that controls wireless communication with a mobile body by multiplexing using multiple wireless transmission paths, in which the processor executes a program recorded in the memory to obtain the moving position of the mobile body, collect the relationship between the moving position and the transmission quality for each of the multiple wireless transmission paths, set a combination of the wireless transmission path and specified parameters based on the transmission quality, determine the timing for switching the set parameters in the set wireless transmission path, and switch the set parameters at that timing.

[0049] 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. It is clear from the claims that various modifications and improvements to the above embodiment are also included in the technical scope of the present invention. [Explanation of symbols]

[0050] 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

Claims

1. A wireless control device that controls wireless communication between a mobile object and the wireless control device, the wireless control device being multiplexed by using a plurality of wireless transmission paths, a position acquisition unit that acquires a moving position of the moving object; a transmission quality collection unit that collects a relationship between the moving position and a transmission quality for each of the plurality of wireless transmission paths; a combination setting unit that sets a combination of the wireless transmission path and a predetermined parameter based on the transmission quality; a switching unit that 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; A wireless control device comprising:

2. The radio control device according to claim 1 , wherein the switching unit switches the parameters one by one.

3. The radio control device according to claim 2 , wherein the switching unit switches the radio transmission paths in ascending order of transmission quality.

4. The wireless control device according to claim 1 , wherein the switching unit switches the parameter during a time when there are few passengers in the elevator.

5. The wireless control device according to claim 4 , wherein the switching unit switches the means when it confirms that there is no user in the elevator car.

6. The wireless control device according to claim 4 , wherein the switching unit determines the time when there are few users by machine learning past usage records.

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

8. The radio control device according to claim 1 , wherein the parameter is one of a frequency, a time, and a code.

9. A wireless control method for controlling wireless communication between a mobile object and a plurality of wireless transmission paths multiplexed by using the plurality of wireless transmission paths, comprising the steps of: The processor executes the program stored in the memory, Acquire a moving position of the moving object; Collecting a relationship between the moving position and a transmission quality for each of the plurality of wireless transmission paths; setting a combination of the wireless transmission path and a predetermined parameter based on the transmission quality; determining a timing for switching the set parameters in the set wireless transmission path, and switching the set parameters at the determined timing; Wireless control method.

10. An elevator control system having a car and a control device that controls the operation of the car, The control device is multiplexed by using a plurality of wireless transmission paths, and includes a wireless control device that controls wireless communication between the control device and the elevator, The wireless control device includes: A position acquisition unit that acquires a moving position of the elevator; a transmission quality collection unit that collects a relationship between the moving position and a transmission quality for each of the plurality of wireless transmission paths; a combination setting unit that sets a combination of the wireless transmission path and a predetermined parameter based on the transmission quality; a switching unit that 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; An elevator control system comprising:

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