JP2002234677A - Radio communication system device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system device for an elevator, achieving adaptability to actual environment where an elevator is operated by radio by hardly receiving influences of other radio devices. SOLUTION: An elevator car 1 and an elevator control room 14 are connected in bi-directional radio communication with one set of radio communication devices 4, 12 whose antennas are opposed to each other so that the transmission power of the radio communication devices 4, 12 can be changed depending on floors on which the elevator car 1 is located.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to communication between an elevator side radio communication device provided in an elevator car and a control room side radio communication device connected to an elevator control room for monitoring the operation of the elevator. And a wireless communication system for elevators.

[0002]

2. Description of the Related Art As a conventional elevator radio communication device, Japanese Patent Application Laid-Open No. 63-282076 discloses a radio device for a skewed elevator. JP-A-63-28207
In Japanese Patent Application Publication No. 6, communication between a car-side antenna provided on an elevator car side and a machine-room antenna provided on a machine room side is performed by using millimeter waves of 50 GHz, and transmission and reception of an operation status message signal is performed. And a technique of transmitting and receiving images and sounds using a microphone, a speaker, a video camera, and a monitor television.

[0003]

However, in such a conventional millimeter-wave communication device used as an elevator radio communication device, the communication distance is proportional to the reception power, and when the communication distance is short, the reception power is small. Is large, and the reception power is small when the communication distance is long. Therefore, when the transmission power is largely fixed, when the communication distance becomes short, the reception power becomes excessive and the millimeter-wave downconverter becomes unstable. Further, in the conventional elevator radio communication device, there is a problem that radio interference is not considered.

[0004] The present invention has been made to solve the above-described problems, and is provided on the elevator car side and the elevator control room side in accordance with the position of the elevator car or the received power indicated by the floor signal. Operates elevators wirelessly by controlling each transmission power in the provided wireless communication device and using a radome to prevent interference with other radio waves, making it less affected by other wireless devices etc. It is an object of the present invention to obtain an elevator radio communication system suitable for an actual environment.

[0005]

An elevator radio communication system according to the present invention comprises an elevator radio communication device provided in an elevator car and a control room radio connected to an elevator control room for monitoring the operation of the elevator. In an elevator wireless communication system that performs wireless communication with a communication device, the elevator-side wireless communication device and the control room-side wireless communication device detect a floor indicating the location of the elevator car, and the detected floor is A floor detection unit that outputs a transmission power value that is set in advance in accordance with the transmission power control unit that controls transmission power for a transmission signal so that the transmission power value is output from the floor detection unit. It is provided.

More specifically, the floor detecting section sets the transmission power value so that the transmission power decreases as the communication distance indicated by the floor decreases and the transmission power increases as the communication distance indicated by the floor increases. I was doing it.

Further, the elevator side radio communication device and the control room side radio communication device each include a reception power detection unit for detecting the power of a received signal, and the transmission power control unit includes:
The transmission power may be controlled according to the power detected by the reception power detection unit.

Further, the elevator side radio communication device and the control room side radio communication device each have a reception power control unit for controlling the power of the reception signal, and the reception power control unit is detected by the floor detection unit. Power control for the received signal may be performed according to the floor.

More specifically, the reception power control unit reduces the amplification factor of the reception power when the communication distance indicated by the floor is short, and increases the amplification factor of the reception power when the communication distance indicated by the floor is long. I did it.

The elevator radio communication system according to the present invention comprises an elevator radio communication device provided in an elevator car and a control room radio communication device connected to an elevator control room for monitoring the operation of the elevator. In an elevator wireless communication system device performing wireless communication between the elevator side wireless communication device and the control room side wireless communication device, a reception power detection unit that detects the power of a received signal, and the reception power detection unit detects the reception power detection unit. And a transmission power control unit for controlling transmission power of a signal to be transmitted in accordance with the transmitted power.

Specifically, the transmission power control section increases the transmission power when the power value detected by the reception power detection section decreases, and decreases the transmission power when the power value detected by the reception power detection section increases. I did it.

On the other hand, the elevator-side wireless communication device and the control room-side wireless communication device are provided at positions where the receiving and transmitting antennas of the antennas are opposed to each other, and radio waves are transmitted and received between the antennas in the radio wave transmission / reception direction. It may be made of a material with low loss on the other hand, and may be stored in a case made of a radio wave absorbing material in each of the directions in which other radio waves enter.

More specifically, the case is made of a dielectric material in which a radio wave absorbing material is provided in the direction in which another radio wave enters.

In the elevator car, a radio wave absorbing member for preventing reflection of the radio wave is provided on a surface of the control room side wireless communication device located in a radio wave transmitting direction, and an elevator shaft on which the elevator car moves. Inside, a radio wave absorber for preventing reflection of the radio wave may be provided on a surface of the elevator side wireless communication device located in the radio wave transmission direction.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in the drawings. Embodiment 1 FIG. FIG. 1 is a schematic configuration diagram showing an example of an elevator radio communication system according to Embodiment 1 of the present invention. In FIG. 1, an elevator car 1 includes an elevator system device 3 formed by connecting a video camera, a microphone, a speaker, a monitor television, and the like to a control panel. The elevator-side system device 3 is connected to an elevator-side wireless communication device 4 provided above the elevator car 1, and the elevator-side wireless communication device 4 includes a receiving antenna 5 a and a transmitting antenna 5.
b.

On the other hand, on the upper part of the elevator shaft, a receiving antenna 11a is provided at a position facing the transmitting antenna 5b of the elevator side radio communication device 4, and at a position facing the receiving antenna 5a of the elevator side radio communication device 4. A control room side wireless communication device 12 provided with a transmission antenna 11b is provided. The control room side wireless communication device 12
Is a control room side system device 1 in an elevator control room 14 for monitoring the operation of the elevator via a control panel 13.
5 is connected. The elevator radio communication system includes an elevator radio communication device 4 and a control room radio communication device 12. The elevator-side wireless communication device 4 and the control room-side wireless communication device 12 are millimeter-wave communication devices having the same configuration, and perform bidirectional wireless communication using millimeter waves, so that the elevator-side system device 3 and the control room-side The system device 15 is wirelessly and bidirectionally connected.

In this manner, various control information such as video, audio and data in the elevator car 1 can be obtained and confirmed in the elevator control room 14 side, and by installing a monitor television in the elevator car 1 side, the elevator control can be performed. Various control information such as video, audio and data can be obtained in the elevator car 1 from the room 14 side. This allows the elimination of cables or trolleys conventionally used in elevator shafts. When the receiving antenna 11a and the transmitting antenna 11b are provided below the elevator shaft, the receiving antenna 5a and the transmitting antenna 5b may be provided below the elevator car 1.

Next, FIG. 2 is a block diagram showing an example of the configuration of the elevator-side radio communication device 4. Referring to FIG.
The configuration of the elevator-side wireless communication device 4 will be described.
The elevator-side wireless communication device 4 includes a receiving unit 18 and a transmitting unit 1.
9. The receiving unit 18 includes a receiving antenna 5a, a millimeter-wave band downconverter 21, a received power control unit 22, a received power detection unit 23, an intermediate frequency (hereinafter, IF (I
ntermediary Frequency) band down converter 2
4, a reception processing unit 25 and a transmission interface unit 26. Hereinafter, the down converter is shown as D / C in the figure.

The millimeter wave signal received by the receiving antenna 5a is frequency-converted to an intermediate frequency by the millimeter wave band down-converter 21 and output to the reception power control unit 22. The reception power control unit 22 outputs the reception power to the reception power detection unit 23 and the IF band down converter 24 such that the power of the input reception signal becomes the set value. Received power detector 2
Reference numeral 3 detects power from a detection voltage of the input signal or the like and outputs the detected power to the reception power control unit 22. Receive power control unit 22
Performs gain control of a built-in receiving amplifier such that an output signal corresponding to an input received signal has a set value of power in accordance with the power detected by the received power detection unit 23. In this way, the reception power control unit 22 sets the reception power detection determination unit 23 and I
The signals are output to the F band down converter 24, respectively.

The IF band down converter 24 converts the frequency of the input intermediate frequency signal to a lower frequency,
The frequency-converted signal is subjected to a predetermined demodulation process in the reception processing unit 25, output to the elevator-side system device 3 via the transmission interface unit 26, and a signal switching unit 37 of the transmission unit 19 described later. Is output to

On the other hand, the transmitting section 19 includes the transmitting antenna 5.
b, millimeter-wave band up-converter 31, transmission power control unit 3
2, transmission power detection unit 33, IF band up-converter 3
4. Transmission processing unit 35, reception interface unit 36, signal switching unit 37, floor determination unit 38, and transmission power map 39
It is composed of Note that the transmission power map 39 is stored in a predetermined storage means such as a memory, and the signal switching unit 37, the floor determination unit 38, and the transmission power map 39 constitute a floor detection unit. Hereinafter, the up-converter is shown as U / C in the figure.

The video, audio, and data signals from the elevator system device 3 are output to the transmission processing unit 35 and the signal switching unit 37 via the reception interface unit 36, respectively. The transmission processing unit 35 performs a predetermined modulation process on the input signal. After the signal subjected to the modulation process is frequency-converted to an intermediate frequency having a higher frequency by the IF band up-converter 34, the transmission power It is output to the control unit 32.

The transmission power control unit 32 outputs the power of the input signal to the millimeter wave band up-converter 31 and the transmission power detection unit 33 such that the power of the input signal becomes the set value. The transmission power detection unit 33 detects the power of the input signal and outputs it to the transmission power control unit 32. Transmission power control unit 32
Controls the gain of the built-in transmission amplifier so that the transmission power of the input signal becomes a set value according to the power detected by the transmission power detection unit 33. In this way, the transmission power control unit 32 sets the millimeter wave band up-converter 31 and the transmission power detection unit 33 so that the transmission power for the signal from the IF band up-converter 34 becomes constant at the set value.
Respectively.

Here, in the case of the elevator side radio communication device 4, the signal switching unit 37 is preset so as to output the signal input from the reception processing unit 25 to the floor determination unit 38. The floor where elevator car 1 is located is
The control room side system device 15 of the elevator control room 14 detects the floor, and the control room side system device 15 transmits a floor signal indicating the floor where the elevator car 1 is located from the elevator control side wireless communication device 12. Let me.

The transmitted floor signal is received by the receiving antenna 5a of the elevator side radio communication device 4, and the millimeter wave band down converter 21, the reception power control unit 22, the reception power detection unit 23, the IF band down converter The processing described above is performed in the reception processing unit 24 and the reception processing unit 25, respectively. Thereafter, the floor signal is transmitted to the floor determination unit 3 via the signal switching unit 37.
8, the floor determination unit 38 uses the transmission power map 39 indicating the relationship between the floor where the elevator car 1 is located and the transmission power, and uses the transmission power control signal corresponding to the floor indicated by the floor signal. To the transmission power control unit 32. The transmission power control unit 32 uses the power value detected by the transmission power detection unit 33 to control the gain of the built-in transmission amplifier so that the transmission power indicated by the transmission power control signal from the floor determination unit 38 is obtained. Do. The power-controlled signal is frequency-converted into a millimeter wave by the millimeter-wave band up-converter 31, and transmitted from the transmitting antenna 5b.

On the other hand, the control room side wireless communication device 12
Although the configuration is the same as that of the elevator-side wireless communication device 4 shown in FIG. 2, the code of each antenna in FIG. 2 is replaced, and the signal switching unit 37 outputs a signal from the reception interface unit 36 to the floor determination unit 38. This is different from the elevator-side wireless communication device 4 in that it is set in advance as described above. In the control room-side wireless communication device 12, the transmission interface unit 26 and the reception interface unit 36 are connected to the control room system device 15.

As described above, the floor where the elevator car 1 is located is detected by the control room side system unit 15 of the elevator control room 14, and the control room side system unit 1
The floor signal from 5 is input from the reception interface unit 36 of the control room side wireless communication device 12 to the floor determination unit 38 via the signal switching unit 37. Control room side wireless communication device 12
In other respects, other configurations and operations are the same as those in FIG. 2 except that the elevator-side system device 3 is replaced with the control-room-side system device 15, so that a block diagram showing a configuration example of the control-room-side wireless communication device 12 and The description is omitted.

FIG. 3 is a schematic block diagram showing an example of the internal configuration of the floor determining section 38. In FIG. 3, the floor determining unit 38 includes a processing unit 41 including a microcomputer, a D / A converter 42, and a low-pass filter 43. The processing unit 41 indicates the relationship between the floor, that is, the communication distance indicated by the floor signal input via the signal switching unit 37, and the transmission power preset from the transmission performance of the floor and the millimeter wave communication device. From the transmission power map 39 obtained, an instruction value of transmission power according to the floor is calculated.

The indicated value is converted into a voltage by a D / A converter 42 and output to a transmission power control unit 32 via a low-pass filter 43. The transmission power control unit 32 controls the transmission power according to the input instruction value. The low-pass filter 43 is provided to remove high-frequency noise from a signal output from the D / A converter 42. In addition, using a digital attenuator, the processing unit 4
The transmission power may be directly instructed from 1 to the transmission power control unit 32. The transmission power control unit 32 controls the gain of the built-in transmission amplifier so that the power detected by the transmission power detection unit 33 becomes a predetermined value.

FIG. 4 is a diagram showing an example of the transmission power map 39. In a millimeter-wave communication device, the communication distance and the received power are proportional, and the received power is large at a short distance and small at a long distance. From this, when the elevator-side wireless communication device 4 is mounted above the elevator car 1 and communicates with the control room-side wireless communication device 12 above the elevator shaft, the communication distance becomes shorter when the floor is higher, and the elevator side Wireless communication device 4 and control room side wireless communication device 1
2, each received power becomes excessive. Therefore, by setting the transmission power map 39 in advance so as to attenuate the transmission power of each of the elevator side wireless communication device 4 and the control room side wireless communication device 12, the elevator side wireless communication device 4 and the control room side wireless communication Excessive reception power in the communication device 12 is prevented.

For example, as shown in FIG. 4, the transmission power map 39 is set so as to attenuate the transmission power above a predetermined floor.
Create The transmission power map 39 is appropriately created from the millimeter-wave band down converter 21, the number of floors, the communication distance, and the like. As an example of the pattern of the transmission power map 39, the transmission output of another station is Pt (dBm), and the gain of the transmission antenna is Gt.
(dB), the gain of the receiving antenna is Gr (dB), the transmission / reception frequency is f (Hz), and the height of the first floor is h (m), the reception power Pr (dBm) and the transmission power Pout of the wireless communication apparatus are given.
(dBm) can be obtained from the following (1). The transmission power map 39 basically has a stair-like pattern according to the floor according to the following equation (1).

Pout = Pr + offset = Pt + Gt + Gr−20 · log (4 · π · n · h · f / c) + offset (1) In the above equation (1), n is a natural number and c is c The light speed and offset indicate the bias values, respectively.

The transmission power Pou obtained from the above equation (1)
A transmission power map 39 is formed according to t and n.
The transmission power map 39 may be calculated and processed by the processing unit 41 using the above equation (1). FIG. 4 shows an example in which the elevator-side wireless communication device 4 is provided above the elevator car 1 and the control room-side wireless communication device 12 is provided above the elevator shaft. When the communication device 4 is provided below the elevator car 1 and the control room side wireless communication device 12 is provided below the elevator shaft, for example, the transmission power map 39 in FIG. Is set to be small. Note that the transmission power map in FIG. 4 is an example, and a plurality of stair-like patterns may be formed according to the number of floors.

As described above, by preparing the elevator side radio communication device 4 and the control room side radio communication device 12 having the same configuration as the elevator side radio communication device 4, both video, audio and data signals are transmitted. Wireless transmission in real time. Note that one of the elevator-side wireless communication device 4 and the control room-side wireless communication device 12 may operate as a transmitter and the other as a receiver. Also, when installing the above wireless communication devices on adjacent elevator shafts, change the wireless channel so that they do not interfere with each other and use them, and further arrange them so that the polarization directions of the antennas are orthogonal to each other. To prevent interference.

Here, the antennas of the radio communication devices 4 and 12 for elevators using millimeter waves have gains of 20 to 40.
Therefore, the aperture angle of each antenna has an angle of tens of degrees to several degrees. In addition, since the antennas of the elevator radio communication devices 4 and 12 are installed facing each other in the vertical direction, the communication direction is vertical propagation. On the other hand, other wireless systems using millimeter waves, such as inter-building communication systems, automobile radars, road-to-vehicle communication, and inter-vehicle communication are expected to increase in the future, and these are likely to be configured by horizontal propagation of the communication direction. . From this, it is conceivable that a radio wave emitted from another wireless system may be an interference wave for a wireless communication device for an elevator.

In order to reduce the influence from other radio systems, each antenna, each part of the radio communication device including each antenna, or each radio communication device is provided for each of the elevator radio communication devices 4 and 12. May be covered with a radome as shown in FIG. FIG. 5 shows a structural example of a case that covers the entire wireless communication device. In addition,
FIG. 5 illustrates the elevator-side wireless communication device 4 as an example, and the same applies to the case of the control room-side wireless communication device 12, and a description thereof will be omitted.

In FIG. 5, the entire radio communication apparatus 4 including the antennas 5a and 5b except for the antenna opening is covered with a radio wave absorber 51. The radio wave absorber 51 fixed inside the radome 52 is a radio wave absorber. In the transmitting / receiving direction of the antenna. With such a configuration, a millimeter wave from another or a millimeter wave generated by itself is transmitted by the radio wave absorber 51 to the wireless communication device 4.
This has the effect of preventing reflection on the surface of the metal case. In addition, the radio wave absorber 51 is installed inside the waterproof case 53 made of a dielectric, so that the radio communication device 4 is not affected by the wind and rain to improve the weather resistance, and the radio wave absorber 51 leaks from the radio communication device 4. The effect of absorbing the transmitted radio wave can be obtained.

On the other hand, the radome 52 has a hemispherical tip for preventing snow damage, and a radio wave absorber 51 is installed inside except for the radio wave transmission / reception direction. By doing so, it is possible to reduce the side lobes of each antenna and not receive unnecessary reflected waves. As described above, the radome 52 is provided so that the radio wave in the horizontal direction with respect to the radio wave transmission and reception Is formed in a dome shape with a metal or a material similar to a metal so as to block the light. In the radome 52, the radio wave transmitting / receiving direction 55 of the antennas 5a and 5b may be formed of a material having low loss with respect to radio waves so that the main lobes of the antennas 5a and 5b are not affected.

The antennas in the elevator-side wireless communication device 4 and the control room-side wireless communication device 12 may be planar antennas as shown in FIG.
In addition, as shown in FIG.
The surface of the elevator car 1 provided with the surface of the elevator car 1 and the surface of the elevator shaft provided with the control room side wireless communication device 12, for example, in the case of FIG. The top surface may be covered with a cage-side millimeter-wave antireflection panel 57 and a control room-side millimeter-wave antireflection panel 58 formed of a dielectric including a radio wave absorber. By doing so, it is possible to reduce the reflection of millimeter waves on the metal surface on the upper surface or the lower surface of the elevator car 1 and the elevator shaft, and to prevent reception of unnecessary reflected waves in each of the wireless communication devices 4 and 12. Communication can be stabilized.

As described above, in the elevator radio communication system according to the first embodiment, the elevator car 1 and the elevator control room 14 are bidirectionally wirelessly communicated by the pair of radio communication devices 4 and 12 whose antennas face each other. Connected, the transmission power of each wireless communication device 4 and 12 is changed according to the floor where the elevator car 1 is located. From this,
The wireless communication during movement of the elevator car can be stabilized, and cross-modulation can be prevented when the wireless communication device on the elevator shaft side and the wireless communication device on the elevator car approach.

Further, each of the wireless communication devices 4 and 12 excluding the antenna opening is covered with a dielectric case 53 in which a radio wave absorber 51 is provided. As a result, it is possible to absorb the millimeter waves transmitted from the opposite wireless communication device, reduce the reflection of the millimeter waves on the metal part of the wireless communication device, and reduce the millimeter waves leaking from the wireless communication device body. Can be done. Further, deterioration due to exposure of the radio wave absorbing member can be prevented, and the wireless communication device main body can be made waterproof or drip-proof. For this reason, the reliability of the wireless communication system for elevators can be improved.

In the first embodiment, if the received power becomes excessive and the millimeter-wave downconverter becomes unstable even after the transmission power is adjusted, the radio wave transmission / reception direction 55 in the radome 52 is Also radio wave absorption band 51
May be provided to suppress transmission power and reception power.

Embodiment 2 In the first embodiment, the transmission power is determined based on the floor signal. However, the transmission power may be controlled based on the reception power for the received signal. Will be referred to as a second embodiment of the present invention. The schematic configuration diagram showing an example of the elevator radio communication system according to the second embodiment of the present invention includes an elevator radio communication device 4a as an elevator radio communication device 4a and a control room radio communication device 12a.
Is the same as FIG. 1 except that the control room side wireless communication device 12a is omitted.

On the other hand, since the elevator side radio communication device 4a and the control room side radio communication device 12a have the same configuration, the elevator side radio communication device 4a will be described as an example. FIG. 8 is a block diagram illustrating a configuration example of an elevator-side wireless communication device of an elevator wireless communication system device according to Embodiment 2 of the present invention. The configuration of the elevator-side wireless communication device will be described with reference to FIG. I do. In addition,
In FIG. 8, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted and only the differences from FIG. 2 will be described. In the case of the control room side wireless communication device 12a,
8 and the elevator-side system device 3 may be replaced with the control-room-side system device 15.

The difference between FIG. 8 and FIG. 2 is that the signal switching unit 37, floor determination unit 38, and transmission power map 39 in FIG. 2 are deleted, and the transmission power control unit 32 in FIG. In order to change the transmission power according to the power detected at 23, the transmission power control unit 32 in FIG. 2 is replaced by a transmission power control unit 32a. The elevator-side wireless communication device 4a includes a receiving unit 18 and a transmitting unit 19a. The transmission unit 19a includes a transmission antenna 5b, a millimeter-wave band up-converter 31, a transmission power control unit 32a, a transmission power detection unit 33, an IF band up-converter 34, a transmission processing unit 35, and a reception interface unit 36. .

Each signal from the elevator side system device 3 is transmitted to the transmission processing unit 3 via the reception interface unit 36.
5 is output. The transmission processing unit 35 performs a predetermined modulation process on the input signal. After the signal subjected to the modulation process is frequency-converted by the IF band up-converter 34 to an intermediate frequency having a high frequency, the transmission power It is output to the control unit 32a. The transmission power control unit 32a outputs the signals to the millimeter wave band up-converter 31 and the transmission power detection unit 33 such that the transmission power of the input signal becomes a set value.

The transmission power detection section 33 detects the power of the input signal and outputs it to the transmission power control section 32a. The transmission power control unit 32a controls the gain of the built-in transmission amplifier so that the transmission power of the input signal becomes a set value according to the power detected by the transmission power detection unit 33. In this way, the transmission power control unit 32 outputs the transmission power to the millimeter-wave band up-converter 31 and the transmission power detection unit 33 such that the transmission power for the signal from the IF band up-converter 34 becomes constant at the set value. .

Here, the reception power detection section 23 outputs the power detected for the signal from the reception power control section 22 to the transmission power control section 32a. The transmission power control unit 32a changes the set value of the transmission power so as to be a value corresponding to the power detected by the reception power detection unit 23, and incorporates the transmission power using the power value detected by the transmission power detection unit 33. Performs gain control of the transmission amplifier. That is, the transmission power control unit 32a increases the transmission power of the signal to be transmitted when the power of the signal received by the reception unit 18 is small, and sets the transmission signal to be transmitted when the power of the signal received by the reception unit 18 is large. So that the transmission power of the transmission becomes small.

As described above, the radio communication system for elevator according to the second embodiment includes the transmission power control unit 32
In a, the transmission power of the transmission signal is controlled in accordance with the power of the signal received by the reception unit 18, that is, the power detected by the reception power detection unit 23. Thus, the configurations of the radio communication device on the elevator shaft side and the radio communication device on the elevator car side can be simplified.

Embodiment 3 The transmission power control unit may set the transmission power according to the power detected by the reception power detection unit and the floor determined by the floor determination unit,
This is referred to as a third embodiment of the present invention. The schematic configuration diagram showing an example of the elevator radio communication system according to the third embodiment of the present invention is such that the elevator radio communication device 4 is changed to the elevator radio communication device 4b and the control room radio communication device 12 is controlled. Except for the room-side wireless communication device 12b, it is the same as FIG.

On the other hand, since the elevator side radio communication device 4b and the control room side radio communication device 12b have the same configuration, the elevator side radio communication device 4b will be described as an example. FIG. 9 is a block diagram illustrating a configuration example of an elevator-side wireless communication device of an elevator wireless communication system device according to Embodiment 3 of the present invention. The configuration of the elevator-side wireless communication device will be described with reference to FIG. I do. In addition,
In FIG. 9, the same components as those in FIG. 2 or FIG. 8 are denoted by the same reference numerals, and the description thereof will be omitted and only the differences from FIG. 2 will be described. In the case of the control room side wireless communication device 12b, the symbols of the respective antennas in FIG. 9 are replaced and the elevator side system device 3 is replaced with the control room side system device 15b.
The signal switching unit 37 is preset so as to output a signal from the reception interface unit 36 to the floor determination unit 38.

The difference between FIG. 9 and FIG. 2 is that the transmission power control unit 32 of FIG. 2 transmits the power in accordance with the power detected by the reception power detection unit 23 and the floor determination input from the floor determination unit 38. Because the power is changed, the transmission power control unit 32 in FIG. 2 is replaced by a transmission power control unit 32b. The elevator-side wireless communication device 4b includes a receiving unit 18 and a transmitting unit 19b. The transmitting unit 19b includes the transmitting antenna 5
b, millimeter-wave band up-converter 31, transmission power control unit 3
2b, transmission power detector 33, IF band up-converter 3
4. Transmission processing unit 35, reception interface unit 36, signal switching unit 37, floor determination unit 38, and transmission power map 39
It is composed of

The transmission power control section 32b outputs the signal input from the IF band up-converter 34 to the millimeter wave band up-converter 31 and the transmission power detection section 33 such that the transmission power of the signal becomes a set value. Received power detector 2
3 outputs the detected power to the signal from the reception power control unit 22 to the transmission power control unit 32b. The transmission power control unit 32b changes the set value of the transmission power so as to be a value corresponding to the power detected by the reception power detection unit 23 and the floor determination from the floor determination unit 38. The gain control of the built-in transmission amplifier is performed using the detected power value. For example, the transmission power control unit 32b increases the transmission power when the reception power is small and / or the communication distance indicated by the floor is long, and transmits the transmission power when the reception power is large and / or the communication distance indicated by the floor is short. Try to reduce the power.

As described above, in the elevator radio communication system according to the third embodiment, the reception power detection unit 23
The power control of the transmission signal by the transmission power control unit 32b is performed in accordance with the power detected in the above and the floor determination from the floor determination unit 38. Thus, transmission power control can be performed in a dual system, and reliability can be improved.

Embodiment 4 In the first embodiment, the floor determination of the floor determination unit 38 is used only by the transmission power control unit 32. However, the floor determination may be used by the reception power control unit 22. This is referred to as a fourth embodiment of the present invention. A schematic configuration diagram illustrating an example of an elevator wireless communication system according to Embodiment 4 of the present invention is configured such that the elevator side wireless communication device 4 is changed to the elevator side wireless communication device 4c and the control room side wireless communication device 12 is controlled. Room side wireless communication device 12c
Since it is the same as FIG.

On the other hand, since the elevator side radio communication device 4c and the control room side radio communication device 12c have the same configuration, the elevator side radio communication device 4c will be described as an example. FIG. 10 is a block diagram illustrating a configuration example of an elevator-side wireless communication device of an elevator wireless communication system according to Embodiment 4 of the present invention.
The configuration of the elevator-side wireless communication device will be described. In FIG. 10, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted, and only the differences from FIG. 2 will be described. In the case of the control room side wireless communication device 12c, the symbols of the respective antennas in FIG. 10 are replaced and the elevator side system device 3 is replaced with the control room side system device 15c.
The signal switching unit 37 is preset so as to output a signal from the reception interface unit 36 to the floor determination unit 38.

The difference between FIG. 10 and FIG. 2 is that the reception power control unit 22 of FIG. 2 receives the power based on the power detected by the reception power detection unit 23 and the floor determination input from the floor determination unit 38. In order to change the power of the signal,
Of the received power control unit 22 is referred to as a received power control unit 22c.
The elevator-side wireless communication device 4c includes a receiving unit 18c and a transmitting unit 19. The receiving unit 18c includes a receiving antenna 5a, a millimeter-wave band downconverter 21, a reception power control unit 22c, a reception power detection unit 23, an IF band downconverter 24, a reception processing unit 25, and a transmission interface unit 26. .

The reception power control unit 22c outputs the signal received from the millimeter-wave band down converter 21 to the reception power detection unit 23 and the IF band down converter 24 such that the reception power of the signal becomes the set value. On the other hand, the floor determination from the floor determination unit 38 is input to the reception power control unit 22c, and the reception power control unit 22c determines the power detected by the reception power detection unit 23 and the floor determination from the floor determination unit 38. The set value of the reception power is changed so as to be a value corresponding to the above-mentioned value, and the gain control of the built-in reception amplifier is performed using the power value detected by the reception power detection unit 23. For example, the reception power control unit 22c
Increases the received power when the received power is small and / or the communication distance indicated by the floor is long, and decreases the received power when the received power is large and / or the communication distance indicated by the floor is short. .

As described above, the elevator radio communication system according to Embodiment 4 includes
The power control of the reception signal by the reception power control unit 22c is performed in accordance with the power detected in the step S1 and the floor determination from the floor determination unit 38. Accordingly, the received power control can be performed according to the floor, the optimum received power control can be performed according to the communication distance, and the open loop control can be realized with a simple configuration. .

In the description of the fourth embodiment, the reception power detection unit 23 detects the reception power and the transmission power detection unit 33 detects the transmission power.
3 and the transmission power detection unit 33 may be deleted, and the reception power control unit 22c and the transmission power control unit 32 may perform power control according to the floor determination from the floor determination unit 38.

Further, the first to fourth embodiments are described.
In, the received power detection unit may detect power from an AGC (automatic gain control) voltage or the like obtained from the IF band down converter 24. Furthermore, in the above-described first to fourth embodiments, a case has been described as an example where a reception antenna and a transmission antenna are provided in the elevator-side wireless communication device and the control room-side wireless communication device, respectively. One transmitting / receiving antenna may be provided for each of the communication device and the control room side wireless communication device.

On the other hand, the first to fourth embodiments described above
In the above, the millimeter-wave band down-converter 21 may include a millimeter-wave reception amplifier. In this case, the millimeter-wave band down-converter 21 performs gain control on the millimeter wave reception amplifier in accordance with the power detected by the reception power detection unit 23 or incorporates an attenuator instead of the reception power control unit. For example, the received power may be controlled. Needless to say, the received power may be controlled by the millimeter-wave band down-converter incorporating such a receiving amplifier and the received power control unit.

[0063]

According to the first aspect of the present invention, the transmission power of the elevator is controlled in accordance with the floor where the elevator car is located. Accordingly, the communication distance between the elevator side wireless communication device and the control room side wireless communication device can be easily detected, and stable communication can be performed when the elevator car moves.

According to a second aspect of the present invention, in the elevator radio communication system according to the first aspect, the transmission power is reduced when the communication distance indicated by the floor is short, and the transmission power is increased when the communication distance indicated by the floor is long. I did it. From this, it is possible to prevent the cross modulation that occurs when the elevator side wireless communication device and the control room side wireless communication device approach each other.

According to a third aspect of the present invention, in the elevator radio communication system, the transmission power is further controlled in accordance with the reception power of the reception signal. Thus, transmission power control can be performed in a dual system, and reliability can be improved.

According to a fourth aspect of the present invention, in the elevator radio communication system according to any one of the first and second aspects, power control is performed on a received signal in accordance with the floor detected by the floor detection unit. From this, it is possible to perform optimal reception power control according to the communication distance.

According to a fifth aspect of the present invention, in the elevator radio communication system according to the fourth aspect, when the communication distance indicated by the floor is shortened, the amplification factor of the received power is reduced, and the communication indicated by the floor is performed. As the distance becomes longer, the gain of the received power is increased. From this, it is possible to perform optimal reception power control according to the communication distance with a simple configuration.

According to a sixth aspect of the present invention, in the elevator wireless communication system, the elevator side wireless communication device and the control room side wireless communication device control the transmission power according to the power of the received signal. Thus, stable communication can be performed when the elevator car moves with a simple configuration.

According to a seventh aspect of the present invention, in the elevator radio communication system according to the third or sixth aspect, the transmission power is reduced when the power of the received signal is large, and the transmission power is increased when the power of the received signal is small. I did it. From this, it is possible to prevent the cross modulation that occurs when the elevator side wireless communication device and the control room side wireless communication device approach each other.

According to an eighth aspect of the present invention, there is provided an elevator radio communication system according to any one of the first to seventh aspects, wherein the elevator side radio communication device and the control room side radio communication device are arranged in a radio wave transmission / reception direction between respective antennas. Is formed of a material having low loss with respect to radio waves, and is stored in a case formed of a radio wave absorbing material with respect to the direction of entry of other radio waves. Accordingly, it is possible to absorb radio waves transmitted from the opposite wireless communication device, reduce the reflection of the radio waves on the metal part, and reduce the radio waves leaking from the wireless communication device.

According to a ninth aspect of the present invention, in the elevator radio communication system device according to the eighth aspect, the case is formed of a dielectric material in which a radio wave absorbing material is provided in a direction in which another radio wave enters. Accordingly, it is possible to prevent the radio wave absorbing material from being deteriorated due to exposure, and to make the elevator-side wireless communication device and the control room-side wireless communication device waterproof or drip-proof.

According to a tenth aspect of the present invention, there is provided an elevator radio communication system according to any one of the first to ninth aspects, for preventing reflection of the radio wave on a surface located in a radio wave transmission direction in the elevator car and the elevator shaft. Of the radio wave absorber. From this, it is possible to prevent the reflection of radio waves by the metal of the elevator car and the elevator shaft.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an example of an elevator radio communication system device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of an elevator-side wireless communication device 4 of FIG.

FIG. 3 is a block diagram showing an example of an internal configuration of a floor determination unit 38 in FIG. 2;

FIG. 4 is a diagram showing an example of a transmission power map 39 of FIG. 2;

FIG. 5 is a diagram illustrating a cross section of a case that covers the entire wireless communication device.

FIG. 6 is a diagram showing a case where a planar antenna in FIG. 5 is used.

FIG. 7 is a schematic configuration diagram showing another example of the elevator radio communication system according to the first embodiment of the present invention.

FIG. 8 is a block diagram illustrating a configuration example of an elevator-side wireless communication device of an elevator wireless communication device according to a second embodiment of the present invention.

FIG. 9 is a block diagram illustrating a configuration example of an elevator-side wireless communication device of an elevator wireless communication system according to Embodiment 3 of the present invention.

FIG. 10 is a block diagram illustrating a configuration example of an elevator-side wireless communication device of an elevator wireless communication system according to a fourth embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 elevator car, 3 elevator-side system device, 4, 4 a to 4 c elevator-side wireless communication device, 5
a, 11a receiving antenna, 5b, 11b transmitting antenna, 12, 12a to 12c control room side wireless communication device, 14 elevator control room, 15 control room side system device, 18, 18c receiving unit, 19, 19a, 19
b transmitter, 21 mm-wave downconverter, 2
2, 22c reception power control section, 23 reception power detection section, 24 IF band down converter, 25 reception processing section, 26 transmission interface section, 31 millimeter wave band up converter, 32, 32a, 32b transmission power control section, 33 transmission Power detection unit, 34 IF band up-converter, 35 transmission processing unit, 36 reception interface unit, 37 signal switching unit, 38 floor determination unit, 39 transmission power map, 41 processing unit,
42 D / A converter, 43 Low-pass filter,
51 Radio wave absorber, 52 Radome, 53 Case, 57 Millimeter wave anti-reflection panel on cage side, 58 Millimeter wave anti-reflection panel on control room side.

Claims (10)

[Claims] 1. An elevator radio communication system device for performing radio communication between an elevator side radio communication device provided in an elevator car and a control room side radio communication device connected to an elevator control room for monitoring operation of the elevator. In the floor detection, the elevator-side wireless communication device and the control room-side wireless communication device detect a floor indicating the location of the elevator car and output a transmission power value set in advance according to the detected floor. And a transmission power control unit that controls transmission power for a transmission signal so that the transmission power value is output from the floor detection unit. 2. The floor detection unit may set a transmission power value such that the transmission power is reduced when the communication distance indicated by the floor is short, and the transmission power is increased when the communication distance indicated by the floor is long. The radio communication system for an elevator according to claim 1, wherein: 3. The elevator-side wireless communication device and the control room-side wireless communication device each include a reception power detection unit that detects power of a received signal, and the transmission power control unit includes:
3. The elevator radio communication system according to claim 1, wherein the transmission power is controlled in accordance with the power detected by the reception power detection unit. 4. The elevator-side wireless communication device and the control room-side wireless communication device each include a reception power control unit that controls power of a reception signal, wherein the reception power control unit is detected by the floor detection unit. The wireless communication system for an elevator according to claim 1 or 2, wherein power control is performed on the received signal in accordance with the floor of the elevator. 5. The reception power control unit according to claim 1, wherein when the communication distance indicated by the floor decreases, the amplification factor of the reception power decreases, and when the communication distance indicated by the floor increases, the amplification ratio of the reception power increases. The elevator radio communication system according to claim 4, characterized in that: 6. An elevator radio communication system device for performing radio communication between an elevator side radio communication device provided in an elevator car and a control room side radio communication device connected to an elevator control room for monitoring the operation of the elevator. A reception power detection unit that detects the power of the received signal, and a transmission power control unit that controls the transmission power of the signal to be transmitted according to the power detected by the reception power detection unit. A wireless communication system for an elevator. 7. The transmission power control unit increases the transmission power when the power value detected by the reception power detection unit decreases,
7. The elevator radio communication system according to claim 3, wherein the transmission power is reduced when the power value detected by the reception power detection unit increases. 8. The elevator-side wireless communication device and the control room-side wireless communication device are provided at positions where a receiving antenna and a transmitting antenna, which are provided to each other, are opposed to each other. 4. The antenna according to claim 1, which is formed of a material having a low loss with respect to the antenna, and is stored in a case formed of a radio wave absorbing material with respect to a direction in which another radio wave enters. 4, 5,
8. The elevator radio communication system according to 6 or 7. 9. The elevator radio communication system according to claim 8, wherein the case is formed of a dielectric material in which a radio wave absorbing material is provided in the direction in which the other radio waves enter. 10. The elevator car, wherein a radio wave absorbing member for preventing reflection of the radio wave is provided on a surface of the control room side wireless communication device located in a radio wave transmitting direction, and an elevator shaft on which the elevator car moves. A radio wave absorbing material for preventing reflection of the radio wave is provided on a surface of the elevator side wireless communication device located in a radio wave transmission direction. 10. An elevator radio communication system according to claim 7, 7, 8, or 9.