WO2018069969A1

WO2018069969A1 - Elevator wireless communication system

Info

Publication number: WO2018069969A1
Application number: PCT/JP2016/080130
Authority: WO
Inventors: 真人高井
Original assignee: 三菱電機株式会社
Priority date: 2016-10-11
Filing date: 2016-10-11
Publication date: 2018-04-19

Abstract

Provided is an elevator wireless communication system with which different signals can be simultaneously transmitted to two cars in the same frequency band. To achieve this, the elevator wireless communication system comprises: a transmission power allocation unit which allocates transmission power to a first and second signal, which are respectively directed towards one of two cars, according to the positions of the two cars; a conversion unit which converts the first and second signals according to the allocated transmission power; a superimposing unit which superimposes the converted first and second signals; and a wireless transmission unit which wirelessly transmits the superimposed signal. Each of the cars is equipped with a car-directed signal acquisition unit which acquires the signal directed to the car from the signals received from a wireless reception unit, and a selection unit which selects either a first or a second method according to the relative positional relationship between the car and the other car. If the first method is selected, the car-directed signal acquisition unit acquires a signal which is obtained by restoring the received signal. If the second method is selected, the car-directed signal acquisition unit acquires a signal which is obtained by subtracting the signal obtained by restoring the received signal from the received signal, and then restoring the subtraction result.

Description

Elevator wireless communication system

This invention relates to an elevator radio communication system.

In an elevator that wirelessly transmits signals between the elevator car and the machine room, a signal processing unit is provided on the elevator control device side in the car and the machine room, and the signal processing unit on the control device side is a control signal to the car. It is known that the identification code for each car is added and transmitted in a time-sharing manner, and the signal processing unit in the car transmits the control signal to the control apparatus with the identification code for each car added. (For example, refer to Patent Document 1).

In addition, there are various types of elevator cars and elevator control rooms respectively provided between the elevator side wireless communication apparatus provided in the elevator car and the elevator control side wireless communication apparatus connected to the elevator control room that monitors the operation of the elevator. In an elevator radio communication system that wirelessly transmits video signals, audio signals, and various control signals from equipment, the elevator-side radio communication device and the elevator control-side radio communication device are each frequency-modulated at different carrier frequencies. For example, Japanese Patent Application Laid-Open No. 2003-22883 discloses a method of performing wireless transmission in both directions by multiplexing each signal.

Japanese Unexamined Patent Publication No. 05-213549 Japanese Unexamined Patent Publication No. 2001-341951

However, in the elevator radio communication system as shown in Patent Document 1, since the control signal to the car added with the identification code for each car is transmitted at different times, for example, each of the two cars When different signals are transmitted, the time required for transmission becomes longer. Therefore, in particular, for example, when transmitting a control signal to each of the sensors mounted on each car, it is necessary to shift the transmission time, and the information collection efficiency by the sensor is reduced.

Further, in an elevator radio communication system as shown in Patent Document 2, in order to perform frequency modulation at different carrier frequencies, for example, when different signals are transmitted to each of two cars, a plurality of frequency bands are used. Need to be used, and the frequency band is compressed. Furthermore, at present, the frequency band that can be used for radio signals is limited, and it is difficult to assign a frequency band in which no interference occurs to each of the two cars. Therefore, signal interference may occur when different signals are transmitted to each of the two cars.

The present invention has been made to solve such problems. The purpose is to reduce the time required for transmission when transmitting different signals to each of the two cars, and to suppress signal interference without squeezing the frequency band. Thus, an elevator radio communication system capable of efficiently transmitting signals is obtained.

In the elevator radio communication system according to the present invention, the two cars arranged in the elevator hoistway so as to be movable up and down, the first signal directed to one of the two cars and the second signal directed to the other. A transmission power allocating unit that allocates transmission power according to the position of each of the two cars, and each of the first signal and the second signal is assigned to the transmission power allocating unit. Wirelessly transmits a conversion unit that converts the transmission signal according to the transmission power allocated by the transmitter, a superimposition unit that superimposes the first signal and the second signal converted by the conversion unit, and a signal that is superimposed by the superposition unit. Each of the two cars includes a wireless receiver capable of receiving a signal wirelessly transmitted by the wireless transmitter, and the first signal from the signal received by the wireless receiver. And the second signal A selection unit that selects a method for obtaining a signal for a car directed to the car among the first method and the second method according to a relative positional relationship between the car and the other car; A self-car signal acquisition unit that acquires a self-car signal from a signal received by the wireless reception unit, and the self-car signal acquisition unit is configured when the selection unit selects the first method. A signal obtained by restoring the signal received by the wireless reception unit is acquired as a signal for a car, and when the selection unit selects the second method, the signal received by the wireless reception unit is restored. The radio reception unit subtracts the signal received from the signal and restores it as a signal for the car.

In the elevator radio communication system according to the present invention, when different signals are transmitted to each of the two cars, the time required for transmission can be shortened, and without pressing the frequency band, In addition, there is an effect that it is possible to efficiently transmit a signal while suppressing signal interference.

It is a figure which shows typically the whole structure of the radio | wireless communications system of the elevator which concerns on Embodiment 1 of this invention. It is a block diagram of the radio | wireless transmission control part with which the radio | wireless communications system of the elevator which concerns on Embodiment 1 of this invention is provided. It is a flowchart explaining operation | movement of the transmission power allocation part with which the radio | wireless transmission control part which concerns on Embodiment 1 of this invention is provided. It is a block diagram of the radio | wireless reception control apparatus with which the radio | wireless communications system of the elevator which concerns on Embodiment 1 of this invention is provided. It is a figure explaining the principle of the conversion of a signal, superimposition, and decompression | restoration in the radio | wireless communications system of the elevator which concerns on Embodiment 1 of this invention.

DETAILED DESCRIPTION Embodiments for carrying out the invention will be described with reference to the accompanying drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and overlapping descriptions are simplified or omitted as appropriate. The present invention is not limited to the following embodiments, and various modifications can be made without departing from the spirit of the present invention.

Embodiment 1 FIG.
1 to 5 relate to Embodiment 1 of the present invention. FIG. 1 is a diagram schematically showing the overall configuration of an elevator radio communication system, and FIG. 2 is a radio transmission control provided in the elevator radio communication system. FIG. 3 is a flowchart for explaining the operation of the transmission power allocation unit included in the radio transmission control unit, FIG. 4 is a block diagram of the radio reception control device included in the elevator radio communication system, and FIG. It is a figure explaining conversion of a signal, superposition, and restoration in a communication system.

As shown in FIG. 1, a first car 1a and a second car 1b are installed in a hoistway 5 of the elevator. The first car 1a and the second car 1b are arranged so as to be able to move up and down in the hoistway 5 independently of each other. The first car 1a and the second car 1b are collectively referred to as a car 1. That is, in the elevator hoistway 5, two cars 1 are arranged so as to be able to be raised and lowered. Each of the two cars 1 moves up and down in the hoistway 5 over a plurality of floors.

One end of the first main rope 4a is connected to the upper end of the first car 1a. The other end of the first main rope 4a is connected to the upper end of a first counterweight (not shown). A first hoisting machine 6 a is installed in the machine room at the top of the hoistway 5. An intermediate portion of the first main rope 4a is wound around a driving sheave of the first hoisting machine 6a. Thus, the 1st cage | basket | car 1a and the 1st counterweight are suspended by the 1st main rope 4a in the shape of the slid which raises / lowers in the mutually opposite direction within the hoistway 5. As shown in FIG.

Further, the second car 1b is also provided in the same manner as the first car 1a. In other words, the second car 1b and the second counterweight (not shown) are suspended by the second main rope 4b in the shape of a hook that moves up and down in directions opposite to each other in the hoistway 5. An intermediate portion of the second main rope 4b is wound around a driving sheave of the second hoisting machine 6b. Similar to the first hoisting machine 6a, the second hoisting machine 6b is installed in the machine room at the top of the hoistway 5.

The operation of the first car 1a is controlled by the first elevator control device 7a. Similarly, the operation of the second car 1b is controlled by the second elevator control device 7b. That is, the driving sheave of the first hoisting machine 6a is rotated by the control of the first elevator control device 7a, and the first car 1a is moved in the hoistway 5 by the rotational driving of the first hoisting machine 6a. Go up and down. Further, the driving sheave of the second hoisting machine 6b is rotated by the control of the second elevator control device 7b, and the second car 1b is moved in the hoistway 5 by the rotational driving of the second hoisting machine 6b. Go up and down.

A radio transmission unit 10 is installed in the hoistway 5. In the example illustrated in FIG. 1, the wireless transmission unit 10 is installed on the top of the hoistway 5 toward the hoistway 5. The wireless transmission unit 10 can transmit a signal wirelessly in the hoistway 5. The operation of the wireless transmission unit 10 is controlled by the wireless transmission control device 20.

The configuration of the wireless transmission control device 20 will be described with reference to FIG. The wireless transmission control device 20 includes a car position acquisition unit 21, a transmission power allocation unit 22, a storage unit 23, a conversion unit 24, and a superimposition unit 25. The car position acquisition unit 21 acquires the respective positions of the two cars 1. The respective positions of the two cars 1 can be obtained from the first elevator control device 7a and the second elevator control device 7b.

Specifically, an encoder (not shown) is attached to each sheave of the first hoisting machine 6a and the second hoisting machine 6b. This encoder outputs, for example, a pulsed signal according to the rotational phase angle of the sheave. By counting the number of pulses of the pulse signal output from the encoder, the amount of rotation of the sheave can be detected.

Moreover, the elevator is provided with a door zone detector (not shown). The door zone detector is for detecting that each car 1 is in the door zone of each floor. The door zone is a range of the position of the car 1 where the car 1 can land on the landing of each floor and open and close the door of the elevator.

And the 1st elevator control device 7a and the 2nd elevator control device 7b are the amount of rotation of each sheave of the 1st hoisting machine 6a and the 2nd hoisting machine 6b, and the output of a door zone detector. Based on this, the respective positions of the first car 1a and the second car 1b can be detected. The car position acquisition unit 21 acquires the position of the first car 1a detected by the first elevator control device 7a and the position of the second car 1b detected by the second elevator control device 7b in this way.

The transmission power allocating unit 22 responds to each position of the two cars 1 with respect to each of the first signal Sa directed to one of the two cars 1 and the second signal Sb directed to the other. Assign transmit power. Here, the first signal Sa is a signal directed to the first car 1a, and the second signal Sb is a signal directed to the second car 1b.

Specifically, the transmission power allocation unit 22 determines the power Pa to be allocated to the first signal Sa and the power Pb to be allocated to the second signal Sb by the following equations (1) and (2), respectively. Here, P is the total transmission power transmitted from the wireless transmission unit 10, and α is a power allocation coefficient. The total transmission power P transmitted from the wireless transmission unit 10 is a constant determined by the specifications of the wireless transmission unit 10 and the like. Further, the power allocation coefficient α takes a value in the range of 0 <α <1.

Pa = αP (1)
Pb = (1-α) P (2)

The power allocation coefficient α is determined according to the relative positional relationship between the two cars 1. For example, when the first car 1a is closer to the wireless transmission unit 10 than the second car 1b, the power allocation coefficient α <0.5. Further, when the first car 1a is located farther from the wireless transmission unit 10 than the second car 1b, the power allocation coefficient α> 0.5. That is, the power allocated to the car 1 located closer to the wireless transmission unit 10 is reduced, and the power allocated to the car 1 located farther from the wireless transmission unit 10 is increased. The relative positional relationship between the two cars 1 is obtained by using the respective positions of the two cars 1 acquired by the car position acquisition unit 21.

Here, the power allocation coefficient table is stored in the storage unit 23 in advance. In the power allocation coefficient table, values of the power allocation coefficient α corresponding to the relative positional relationship between the two cars 1 are stored in advance. A specific method for predetermining the value of the power allocation coefficient α corresponding to each of the relative positional relationships of the two cars 1 will be described later.

Referring to FIG. 3, the operation flow when the transmission power allocation unit 22 allocates power will be described. First, in step S1, the transmission power allocation unit 22 determines that the first car 1a and the second car 1b are at the same position, that is, on the same floor, based on the position of the car 1 acquired by the car position acquisition unit 21. Check whether or not. If the first car 1a and the second car 1b are on the same floor, the process proceeds to step S2.

In step S2, the transmission power allocation unit 22 sets the power allocation coefficient α to 0.5. And transmission power is allocated with respect to each of 1st signal Sa and 2nd signal Sb like (1) Formula and (2) Formula. When the process of step S2 is completed, a series of operation flows is completed.

On the other hand, if the first car 1a and the second car 1b are not on the same floor in step S1, the process proceeds to step S3. In step S3, the transmission power allocation unit 22 refers to the power allocation coefficient table stored in the storage unit 23, and is stored corresponding to the relative positional relationship between the first car 1a and the second car 1b. Select a value for the power allocation coefficient α. Then, using the value of the selected power allocation coefficient α, transmission power is allocated to each of the first signal Sa and the second signal Sb, as in Expression (1) and Expression (2). When the process of step S3 is completed, a series of operation flows is completed.

Note that the power allocation coefficient α (= 0.5) when the first car 1a and the second car 1b are on the same floor is also stored in advance in the power allocation coefficient table stored in the storage unit 23. It may be left. In this case, the transmission power allocation unit 22 always determines the power allocation coefficient α by referring to the power allocation coefficient table stored in the storage unit 23 regardless of the flow of FIG.

The conversion unit 24 converts each of the first signal Sa and the second signal Sb according to the transmission power allocated by the transmission power allocation unit 22. In this conversion, specifically, the conversion unit 24 expands or compresses the signal amplitude of each of the first signal Sa and the second signal Sb according to the transmission power allocated by the transmission power allocation unit 22. Assuming that the converted signal of the first signal Sa is S′a and the converted signal of the second signal Sb is S′b, the converted S′a and S′b are expressed by the equations (1) and (2). Using the formula, it can be expressed as the following formula (3) and formula (4).

S′a = (√Pa) Sa = (√ (αPa)) Sa (3)
S′b = (√Pb) Sb = (√ ((1−α) P)) Sb (4)

The superimposing unit 25 superimposes the first signal Sa and the second signal Sb converted by the converting unit 24. Here, the first signal Sa converted by the conversion unit 24 is S′a. The second signal Sa converted by the conversion unit 24 is S′b. Therefore, by using the equations (3) and (4), the signal x superimposed by the superimposing unit 25 can be expressed as the following equation (5).

X = S'a + S'b = (√ (αPa)) Sa + (√ ((1-α) P)) Sb (5)

Then, the wireless transmission unit 10 wirelessly transmits the signal x superimposed by the superimposition unit 25. Therefore, the wireless transmission unit 10 can wirelessly transmit the first signal Sa and the second signal Sb simultaneously in the same frequency band.

Here, from equation (5), the transmission rate R when the signal x superimposed by the superimposing unit 25 is transmitted wirelessly can be expressed by the following equation (6). In the equation (6), ha is an attenuation constant for the first car 1a of the radio signal. Further, hb is an attenuation constant for the second car 1b of the radio signal.

R = log (1 + haαP) + log (1 + hb ((1−α) P) / (1 + αP)) (6)

Next, a method for determining the value of the power allocation coefficient α corresponding to each of the relative positional relationships of the two cars 1 stored in advance in the power allocation coefficient table stored in the storage unit 23 will be described. The value of the power allocation coefficient α corresponding to each of the relative positional relationships of the two cars 1 is determined using the equation (6). That is, the power allocation coefficient α is determined to be a value that maximizes the value of the transmission rate R expressed by the equation (6).

Here, the attenuation constants ha and hb are determined according to the distance between the wireless transmission unit 10 and a wireless reception unit 2 described later included in each car 1. That is, if the position of the first car 1a is determined, ha is also determined. If the position of the second car 1b is determined, hb is also determined. Therefore, when obtaining the power allocation coefficient α for the relative positional relationship between two cars 1, these attenuation constants ha and hb can be handled as constants. Further, the total transmission power P is a constant determined by the specifications of the wireless transmission unit 10 as described above. Therefore, the value of the power allocation coefficient α that maximizes the value of the transmission rate R expressed by the equation (6) can be determined.

The first wireless receiver 2a is installed in the first car 1a. The first wireless reception unit 2a can receive a signal transmitted by the wireless transmission unit 10 wirelessly. The second car 1b is provided with a second radio receiving unit 2b. The second radio reception unit 2b can receive a signal transmitted by the radio transmission unit 10 wirelessly. Hereinafter, the first wireless receiving unit 2a and the second wireless receiving unit 2b are collectively referred to as a wireless receiving unit 2. Accordingly, each of the two cars 1 includes a wireless receiver 2 that can receive a signal transmitted wirelessly by the wireless transmitter 10.

The first car 1a is provided with a first radio reception control device 100a. The first radio reception control device 100a controls the operation of the first radio reception unit 2a. A second radio reception control device 100b is installed in the second car 1b. The second radio reception control device 100b controls the operation of the second radio reception unit 2b. Hereinafter, the first radio reception control device 100a and the second radio reception control device 100b are collectively referred to as the radio reception control device 100. Accordingly, each of the two cars 1 includes a radio reception control device 100 that controls the operation of the radio reception unit 2 of the car 1.

Next, the configuration of the wireless reception control device 100 will be described with reference to FIG. Each unit included in the wireless reception control device 100 described below has a configuration provided in each of the two cars 1. The radio reception control apparatus 100 includes a car relative positional relationship acquisition unit 110, a selection unit 120, and a signal acquisition unit 130 for the own car.

The car relative positional relationship acquisition unit 110 acquires the relative positional relationship between the car and the other car. Here, the own car is the car 1 of the two cars 1 (the first car 1a and the second car 1b) in which the wireless reception control device 100 of interest is provided. is there. On the other hand, the other car is the car 1 that is not the own car among the two cars 1 (the first car 1a and the second car 1b).

In the example illustrated in FIG. 4, the car relative positional relationship acquisition unit 110 includes a self-car position acquisition unit 111 and another car position acquisition unit 112. The own car position acquisition unit 111 acquires the position of the own car from, for example, one of the first elevator control device 7a and the second elevator control device 7b that controls the own car. In addition, the other car position acquisition unit 112 acquires the position of the other car from, for example, the first elevator control device 7a and the second elevator control device 7b that control the other car. Then, the car relative position relationship acquisition unit 110 calculates the relative of the car and the other car from the position of the car acquired by the car position acquisition unit 111 and the position of the other car acquired by the other car position acquisition unit 112. Find the positional relationship.

As described above, the wireless transmission unit 10 includes the car position acquisition unit 21 that acquires the positions of the two cars 1. Therefore, based on the information acquired by the car position acquisition unit 21, the car relative position relationship acquisition unit 110 may acquire the relative position relationship of each car and other cars.

That is, in this modified example, the wireless transmission unit 10 transmits information on the relative positional relationship between the two cars 1 obtained from the car 1 acquired by the car position acquisition unit 21 together with the signal superimposed by the superimposition unit 25. . Then, the car relative position relationship acquisition unit 110 acquires the relative position relationship between the two cars 1 from the information on the relative position relationship between the two cars 1 received by the wireless reception unit 2. In the case of this configuration, the car relative positional relationship acquisition unit 110 may not include the own car position acquisition unit 111 and the other car position acquisition unit 112.

The selection unit 120 determines a method for acquiring a signal for the own car directed to the own car from the signals received by the wireless reception unit 2 from the first signal Sa and the second signal Sb. The first method and the second method are selected according to the relative positional relationship. Specifically, when the own car is located farther from the wireless transmission unit 10 than the other car, the selection unit 120 selects the first method. On the other hand, when the own car is closer to the wireless transmission unit 10 than the other car, the selection unit 120 selects the second method.

Note that the relative position relationship of the car and other cars used by the selection unit 120 is the one acquired by the car relative position relationship acquisition unit 110. Therefore, when the car relative positional relationship acquisition unit 110 includes the own car position acquisition unit 111 and the other car position acquisition unit 112, the selection unit 120 determines the position of the own car acquired by the own car position acquisition unit 111. Based on the position of the other car acquired by the other car position acquisition unit 112, a method for acquiring the signal for the own car is selected from the first method and the second method.

On the other hand, in the modified example in which the car relative position relationship acquisition unit 110 described above does not include the own car position acquisition unit 111 and the other car position acquisition unit 112, the selection unit 120 includes two units received by the wireless reception unit 2. Using the information on the relative positional relationship of the car 1, a method for acquiring the signal for the car is selected from the first method and the second method.

The own car signal acquisition unit 130 acquires the own car signal from the signal received by the wireless reception unit 2. The own car signal acquisition unit 130 includes a restoration unit 131 and a subtraction unit 132. The restoration unit 131 restores and outputs the input signal. The restoration method at this time corresponds to the conversion method used by the conversion unit 24. The subtracting unit 132 subtracts the other from one of the two input signals and outputs the result. The own car signal acquisition unit 130 uses the restoration unit 131 and the subtraction unit 132 to acquire the own car signal from the signal received by the wireless reception unit 2.

As the method for the car-acquisition signal acquisition unit 130 to acquire the car-originated signal, the method selected by the selection unit 120 among the first method and the second method is used. Next, specific contents of the first method and the second method will be described.

First, in the first method, the own car signal acquisition unit 130 inputs the signal received by the wireless reception unit 2 to the restoration unit 131. The restoration unit 131 restores and outputs the signal received by the wireless reception unit 2. Then, the own car signal acquisition unit 130 acquires the signal output from the restoration unit 131 as the own car signal. That is, when the selection unit 120 selects the first method, the own car signal acquisition unit 130 acquires a signal obtained by restoring the signal received by the wireless reception unit 2 as the own car signal.

On the other hand, in the second method, first, the car-acquisition signal acquisition unit 130 inputs the signal received by the wireless reception unit 2 to the restoration unit 131. The restoration unit 131 restores and outputs the signal received by the wireless reception unit 2. Next, the own car signal acquisition unit 130 inputs the signal output from the restoration unit 131 and the signal received by the wireless reception unit 2 to the subtraction unit 132. The subtraction unit 132 subtracts the signal restored by the restoration unit 131 from the signal received by the wireless reception unit 2 and outputs the result.

Subsequently, the restoration unit 131 restores the signal output from the subtraction unit 132. The self-car signal acquisition unit 130 acquires the restored signal as a self-car signal. That is, when the selection unit 120 selects the second method, the signal acquisition unit 130 for own car subtracts the restored signal received by the wireless reception unit 2 from the signal received by the wireless reception unit 2. Then, the signal restored again is acquired as a signal for the car.

Next, the principle of signal conversion, superposition and restoration in the elevator radio communication system configured as described above will be described with reference to FIG. The figure shows an example of the positional relationship shown in FIG. That is, the example shown in FIG. 5 is in a relative positional relationship in which the first car 1 a is closer to the wireless transmission unit 10 and the second car 1 b is farther from the wireless transmission unit 10.

In the example shown in the figure, since the second car 1b is farther from the wireless transmission unit 10, the transmission power allocation unit 22 allocates larger power to the second signal Sb. Further, since the first car 1a is closer to the wireless transmission unit 10, the transmission power allocation unit 22 allocates smaller power to the first signal Sa. Therefore, if the maximum amplitudes of the first signal Sa and the second signal Sb are equal, the maximum amplitude of the signal S′b obtained by converting the second signal Sb by the conversion unit 24 is the same as that of the first signal Sa. It becomes larger than the maximum amplitude of the signal S′a converted by the converter 24.

Then, the combined signal x in which the superimposing unit 25 superimposes S′a and S′b is transmitted from the wireless transmission unit 10. The composite signal x transmitted from the wireless transmission unit 10 is received by each of the first wireless reception unit 2a of the first car 1a and the second wireless reception unit 2b of the second car 1b.

First, in the second car 1b, since the own car is located farther from the wireless transmission unit 10 than the other car, the selection unit 120 selects the first method. Therefore, the own car signal acquisition unit 130 acquires the own car signal by the first method. That is, first, the restoration unit 131 restores the signal received by the first wireless reception unit 2a.

At this time, as described above, the maximum amplitude of S′b is larger than the maximum amplitude of S′a. The composite signal x transmitted from the wireless transmission unit 10 is attenuated at a constant rate until it is received by the second wireless reception unit 2b, but in the attenuated signal received by the second wireless reception unit 2b However, the relative relationship between the maximum amplitude of S′b and the maximum amplitude of S′a does not change. Therefore, even in the signal received by the second wireless reception unit 2b, the relationship that the maximum amplitude of S'b is larger than the maximum amplitude of S'a is maintained.

The restoration unit 131 restores S′a having a small maximum amplitude as noise. Therefore, a signal obtained by restoring the signal received by the second wireless reception unit 2b is Sb. Thus, the own car signal acquisition unit 130 of the second car 1b can acquire the second signal Sb directed to the second car 1b.

On the other hand, in the first car 1a, since the own car is closer to the wireless transmission unit 10 than the other car, the selection unit 120 selects the second method. Therefore, the own car signal acquisition unit 130 acquires the own car signal by the second method. That is, first, the restoration unit 131 restores the signal received by the first wireless reception unit 2a. At this time, as in the previous case, the relationship that the maximum amplitude of S'b is larger than the maximum amplitude of S'a is also maintained in the signal received by the first radio reception unit 2a. Then, the restoration unit 131 performs restoration by regarding S′a having a small maximum amplitude as noise. Therefore, a signal obtained by restoring the signal received by the first wireless reception unit 2a is Sb.

Next, the subtraction unit 132 subtracts Sb obtained by restoring the signal received by the first radio reception unit 2a from the signal received by the first radio reception unit 2a. At this time, the subtraction unit 132 amplifies the signal Sb restored by the restoration unit 131 so that the maximum amplitude of the signal Sb restored by the restoration unit 131 matches the maximum amplitude of the signal received by the first wireless reception unit 2a. Subtract above.

Therefore, as a result of the subtraction by the subtraction unit 132, S'b is removed from the signal received by the first wireless reception unit 2a, and only S'a remains. The S′a obtained in this way is restored by the restoration unit 131 to be Sa. In this way, the own car signal acquisition unit 130 of the first car 1a can acquire the first signal Sb directed to the first car 1a.

In the example described above, the first car 1a and the second car 1b are in different positions. On the other hand, when the positions of the first car 1a and the second car 1b are the same, as described above, since the power allocation coefficient α = 0.5, the maximum amplitudes of S′a and S′b after conversion are It becomes equivalent. Even in this case, for example, the first signal Sa and the second signal Sb can be separated on the receiving side by using a known modulation method. Specifically, for example, by shifting the phases of two signals in a signal space diagram of binary phase-shift keying (BPSK: Binary Phase-Shift Keying) by π / 2, even if the allocated power is equal, the signal space It is already known that two signals can be separated by avoiding overlapping of two signal points in a diagram.

Alternatively, even when the positions of the first car 1a and the second car 1b are the same, the power allocation coefficient α may be set to a value different from 0.5. Thus, by setting the power allocation coefficient α to a value different from 0.5 and intentionally causing a difference between the maximum amplitudes of the two signals, the positions of the first car 1a and the second car 1b can be changed. The first signal Sa and the second signal Sb can be separated on the receiving side by the same method as in the different case.

The elevator radio communication system configured as described above includes two cars 1 disposed in an elevator hoistway 5 so as to be capable of being raised and lowered, and a first signal Sa directed to one of the two cars 1 and For each of the second signals Sb directed to the other side, a transmission power allocation unit 22 that allocates transmission power according to the respective positions of the two cars 1, and the first signal Sa and the second signal Sb The conversion unit 24 converts each of them according to the transmission power allocated by the transmission power allocation unit 22, and the first signal Sa and the second signal Sb converted by the conversion unit 24, that is, S′a and S′b. Are provided in the hoistway 5, and a wireless transmission unit 10 is provided that wirelessly transmits the signal x superimposed by the superposition unit 25.

Each of the two cars 1 includes a wireless receiver 2 that can receive a signal transmitted wirelessly by the wireless transmitter 10, and a first signal Sa and a second signal from the signal x received by the wireless receiver 2. A selection unit that selects, from the first method and the second method, a method for acquiring a signal directed to the car among the signals Sb according to the relative positional relationship between the car and the other car. 120, and a car-acquisition signal acquisition unit 130 that acquires a signal for the car from the signal received by the wireless reception unit 2.

Then, when the selection unit 120 selects the first method, the own car signal acquisition unit 130 acquires a signal obtained by restoring the signal received by the wireless reception unit 2 as the own car signal. In addition, when the selection unit 120 selects the second method, the signal acquisition unit 130 for the own car subtracts the restored signal received by the wireless reception unit 2 from the signal received by the wireless reception unit 2. The signal restored in step 1 is acquired as a signal for the car.

For this reason, different signals can be transmitted to each of the two cars simultaneously and without causing interference in the same frequency band. Therefore, the time required for transmission can be shortened, and the signal can be efficiently transmitted without suppressing the frequency band and suppressing signal interference.

Specifically, for example, when a control signal is transmitted to each of the sensors mounted on each car 1, the wireless transmission unit 10 sends each of the sensors of the first car 1a and the sensors of the second car 1b. Different control signals can be transmitted simultaneously using the same frequency band. Therefore, it is possible to efficiently control the sensors of each car 1 and improve the information collection efficiency.

In addition, for example, when information to be displayed on an information monitor installed in each car 1 is transmitted, the information monitor of the first car 1a and the information monitor of the second car 1b are different. Information can be transmitted simultaneously using the same frequency band.

The present invention can be used in an elevator radio communication system that transmits signals to each of two elevator cars by radio.

DESCRIPTION OF SYMBOLS 1 Car 1a 1st car 1b 2nd car 2 Wireless receiving part 2a 1st wireless receiving part 2b 2nd wireless receiving part 4a 1st main rope 4b 2nd main rope 5 Hoistway 6a 1st volume Upper machine 6b Second hoisting machine 7a First elevator control device 7b Second elevator control device 10 Wireless transmission unit 20 Wireless transmission control device 21 Car position acquisition unit 22 Transmission power allocation unit 23 Storage unit 24 Conversion unit 25 Superposition Unit 100 radio reception control device 100a first radio reception control device 100b second radio reception control device 110 car relative positional relationship acquisition unit 111 own car position acquisition unit 112 other car position acquisition unit 120 selection unit 130 acquisition of signal for own car Unit 131 restoration unit 132 subtraction unit

Claims

Two cars arranged in an elevator hoistway so that they can be raised and lowered,
A transmission power allocating unit that allocates transmission power to each of the first signal directed to one of the two cars and the second signal directed to the other according to the position of each of the two cars; ,
A converter that converts each of the first signal and the second signal according to the transmission power allocated by the transmission power allocation unit;
A superimposing unit that superimposes the first signal and the second signal converted by the converting unit;
A wireless transmission unit that wirelessly transmits the signal superimposed by the superimposition unit,
Each of the two baskets
A wireless receiver capable of receiving a signal transmitted wirelessly by the wireless transmitter; and
A method of acquiring a signal for a car that is directed to a car among the first signal and the second signal from a signal received by the wireless reception unit, in a relative positional relationship between the car and another car. In response, a selection unit for selecting from the first method and the second method;
A signal acquisition unit for a car for acquiring a signal for the car from the signal received by the wireless reception unit, and
The signal acquisition unit for the own car
When the selection unit has selected the first method, the signal received by the wireless reception unit is obtained as a signal for the car,
When the selection unit selects the second method, the signal restored by subtracting the signal received by the radio reception unit from the signal received by the radio reception unit is used as the signal for the car. The wireless communication system of the elevator to acquire.
The wireless transmission unit transmits information on the relative positional relationship between the two cars together with the signal superimposed by the superimposing unit,
The said selection part selects the method of acquiring the signal for own cars from the 1st method and the 2nd method using the information of the relative positional relationship of the said two cars which the said radio | wireless receiving part received. Item 2. The elevator radio communication system according to Item 1.
Each of the two baskets
An own car position acquisition unit for acquiring the position of the own car;
An other car position acquisition unit for acquiring the position of the other car,
A first method is a method in which the selection unit acquires a signal for the own car based on the position of the own car acquired by the own car position acquisition unit and the position of the other car acquired by the other car position acquisition unit. The elevator wireless communication system according to claim 1, wherein the elevator wireless communication system is selected from: