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CN107826917A - A kind of elevator floor automatic identifying method, system and control terminal - Google Patents

A kind of elevator floor automatic identifying method, system and control terminal Download PDF

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Publication number
CN107826917A
CN107826917A CN201710911908.1A CN201710911908A CN107826917A CN 107826917 A CN107826917 A CN 107826917A CN 201710911908 A CN201710911908 A CN 201710911908A CN 107826917 A CN107826917 A CN 107826917A
Authority
CN
China
Prior art keywords
floor
elevator
information
sound
intensity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710911908.1A
Other languages
Chinese (zh)
Inventor
袁志炜
赵明
余启轩
张阳新
刘永
牟其龙
王洪亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Has A Robot Co Ltd
Original Assignee
Shanghai Has A Robot Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Has A Robot Co Ltd filed Critical Shanghai Has A Robot Co Ltd
Priority to CN201710911908.1A priority Critical patent/CN107826917A/en
Publication of CN107826917A publication Critical patent/CN107826917A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B3/00Applications of devices for indicating or signalling operating conditions of elevators
    • B66B3/02Position or depth indicators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B3/00Applications of devices for indicating or signalling operating conditions of elevators
    • B66B3/02Position or depth indicators
    • B66B3/023Position or depth indicators characterised by their mounting position
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0006Monitoring devices or performance analysers
    • B66B5/0018Devices monitoring the operating condition of the elevator system

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  • Indicating And Signalling Devices For Elevators (AREA)

Abstract

The present invention provides a kind of elevator floor automatic identifying method, system and control terminal, comprises the following steps:Intensity of sound information at the lift car that each sound detection device that reception is arranged on each floor is sent at same sound source to each floor;Floor information is currently located according to the intensity of sound acquisition of information elevator at each floor;Floor information is currently located according to elevator information and the elevator and generates and sends elevator floor identification information.Elevator floor automatic identifying method, system and the control terminal of the present invention is currently located floor information according to the same sound source from lift car to the intensity of sound of different floors to obtain elevator, and quick and precisely, practicality is good.

Description

A kind of elevator floor automatic identifying method, system and control terminal
Technical field
The present invention relates to the technical field of data processing, more particularly to a kind of elevator floor automatic identifying method, system And control terminal.
Background technology
With the rapid development of intelligent robot, it has gradually been deep into the every aspect of human lives.In business machine People field, intelligent robot need to enter hotel, office building or other high rise elevators building.For example, under hotel's scene, when When intelligent robot enters alone elevator, intelligent robot only knows that the judgement that floor where itself could accurately and timely is next Step need to perform operation.
Therefore, how to assist intelligent robot to identify itself place floor, turn into the popularization of commercial service class intelligent robot One of key issue of application.
The content of the invention
In view of the above the shortcomings that prior art, it is an object of the invention to provide a kind of elevator floor automatic identification side Method, system and control terminal, worked as according to the same sound source from lift car to the intensity of sound of different floors to obtain elevator Preceding place floor information, quick and precisely, practicality is good.
In order to achieve the above objects and other related objects, the present invention provides a kind of elevator floor automatic identifying method, including Following steps:Receive and be arranged at the lift car that each sound detection device of each floor is sent same sound source to each Intensity of sound information at floor;Floor letter is currently located according to the intensity of sound acquisition of information elevator at each floor Breath;Floor information is currently located according to elevator information and the elevator and generates and sends elevator floor identification information.
In one embodiment of the invention, it is additionally included in and obtains elevator while be currently located floor information, according to the electricity Ladder be currently located floor information variation tendency obtain elevator running state information, and by the running state information with it is described Elevator floor identification information is sent simultaneously.
Accordingly, the present invention provides a kind of elevator floor automatic recognition system, including receiving module, acquisition module and generation Sending module;
The receiving module, which is used to receive, is arranged on the lift car that each sound detection device of each floor is sent Locate the intensity of sound information at same sound source to each floor;
The acquisition module is used to be currently located floor according to the intensity of sound acquisition of information elevator at each floor Information;
The generation sending module generates and sends for being currently located floor information according to elevator information and the elevator Elevator floor identification information.
In one embodiment of the invention, the identification module is additionally operable to be currently located the same of floor information in identification elevator When, the variation tendency that floor information is currently located according to the elevator obtains the running state information of elevator, and by the operation Status information is sent simultaneously with the elevator floor identification information.
Meanwhile the present invention provides a kind of control terminal, including communicator, processor and memory;
The communicator is used to receive at the lift car that each sound detection device for being arranged on each floor is sent Intensity of sound information and transmission elevator floor identification information at same sound source to each floor;
The memory is used to store computer program;
The processor is used for the computer program for according to the intensity of sound information, performing the memory storage, with The control terminal is set to perform above-mentioned elevator floor automatic identifying method.
Finally, the present invention provides a kind of elevator floor automatic recognition system, including above-mentioned control terminal, sound generating apparatus With some sound detection devices;
The sound generating apparatus is arranged in lift car, for generating the sound of fixed frequency;
Some sound detection devices are arranged on each floor corresponding position one by one, are respectively used to received by generation The sound intensity of sound information, and send to the control terminal.
In one embodiment of the invention, sound generating apparatus height on the elevator car and sound detection dress The height put in current floor is consistent.
In one embodiment of the invention, the sound detection device is arranged on the preset range on the inside of the entrance hall of each floor It is interior.
As described above, the elevator floor automatic identifying method of the present invention, system and control terminal, have below beneficial to effect Fruit:
(1) building is currently located to obtain elevator according to the same sound source from lift car to the intensity of sound of different floors Layer information;
(2) fast response time, practicality are good;
(3) solve commercial service class intelligent robot when passing in and out elevator or in elevator up and down when accurate judgement work as The problem of preceding place floor.
Brief description of the drawings
Fig. 1 is shown as flow chart of the elevator floor automatic identifying method of the present invention in an embodiment;
Fig. 2 is shown as structural representation of the elevator floor automatic recognition system of the present invention in an embodiment;
Fig. 3 is shown as structural representation of the control terminal of the present invention in an embodiment;
Fig. 4 is shown as structural representation of the elevator floor automatic recognition system of the present invention in another embodiment.
Component label instructions
21 receiving modules
22 acquisition modules
23 generation sending modules
31 communicators
32 processors
33 memories
41 control terminals
42 sound generating apparatus
43 sound detection devices
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from Various modifications or alterations are carried out under the spirit of the present invention.
It should be noted that the diagram provided in the present embodiment only illustrates the basic conception of the present invention in a schematic way, Then the component relevant with the present invention is only shown in schema rather than is painted according to component count, shape and the size during actual implement System, kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its assembly layout kenel also may be used Can be increasingly complex.
Elevator floor automatic identifying method, system and the control terminal of the present invention is according to the same sound source from lift car Floor information is currently located to obtain elevator to the intensity of sound of different floors, fast response time, meets commercial service class intelligence Robot is currently located the demand of floor information to elevator.
As shown in figure 1, in an embodiment, elevator floor automatic identifying method of the invention comprises the following steps:
Step S1, receive and be arranged on same sound source at the lift car that each sound detection device of each floor is sent Intensity of sound information to each floor.
Specifically, sound detection device is provided with each floor corresponding position, for from lift car The same sound that sound generating apparatus is sent carries out intensity of sound detection, and the intensity of sound information received is sent to control Terminal.Control terminal enters row data communication with each sound detection device by communications such as WiFi, bluetooth, 3G/4G.
Step S2, floor information is currently located according to the intensity of sound acquisition of information elevator at each floor.
Specifically, because each sound detection device distance means are different from the distance of sound generating apparatus, therefore each sound The intensity of sound for multiple voice signals that sound detection device detects is also different.According to intensity of sound attenuation principle, transmission path More remote, intensity of sound decay is more.Therefore intensity of sound is bigger, show the distance between sound generating apparatus and sound detection device It is nearer.Therefore, when sound generating apparatus and sound detection device are located at same floor, intensity of sound is maximum.Therefore according to described When intensity of sound acquisition of information elevator is currently located floor information, sent out according to floor corresponding to maximum acoustic intensity and sound Position relationship between generating apparatus and sound detection device is currently located floor to obtain elevator.For example, work as sound generating apparatus When being located at same floor relative position with sound detection device, the floor where sound detection device is that elevator is currently located building Layer;, need to be according to sound generating apparatus and sound detection device when sound generating apparatus and sound detection device shift to install Floor where alternate position spike and sound detection device is currently located floor information to obtain elevator.For example, sound detection device is equal It is arranged on floor bottom, when sound generating apparatus is arranged on elevator car roof, the maximum sound detection device institute of intensity of sound It is that elevator is currently located floor to subtract 1 in floor.Sound detection device is arranged at the top of floor, sound generating apparatus is set At lift car bottom, floor where the maximum signal generation apparatus of intensity of sound is that elevator is currently located floor plus 1.
Step S3, floor information is currently located according to elevator information and the elevator and generates and sends elevator floor identification letter Breath.
Specifically, after acquisition elevator is currently located floor information, control terminal is according to the current institute of elevator information and elevator Elevator floor identification information is generated in floor information, and is sent by way of by radio communications such as WiFi, 3G/4G or bluetooths To equipment such as intelligent robots, to assist it to carry out next step operation.Wherein, elevator information includes elevator location information, numbering Information etc., to be accurately positioned current information.
In one embodiment of the invention, the elevator floor identification information uses XXXXYYYYZZZZAAAA form.Its In, the identification code of position where XXXX represents elevator, such as Shanghai -0021;YYYY represents the building numbering where the elevator, Such as 0001;ZZZZ represents that the use numbering in the building where the elevator, such as No. 2 ladders are expressed as 0002;AAAA represents electricity Ladder is currently located floor information identification code, such as 12 layers are expressed as 0012.Therefore, 4 buildings positions of No. 2 ladders in the building of Shanghai City the 3rd The elevator floor identification information of elevator be represented by 0021000300020004.
In one embodiment of the invention, it is additionally included in and obtains elevator while be currently located floor information, according to the electricity Ladder be currently located floor information variation tendency obtain elevator running state information, and by the running state information with it is described Elevator floor identification information is sent simultaneously.Specifically, the running state information includes up, descending and stopped.When obtaining When the elevator taken is currently located floor information and tapered into, judge that elevator is descending;When the elevator of acquisition is currently located floor information When becoming larger, ascending for elevator is judged;When the elevator of acquisition, which is currently located floor information, keeps constant, judge that elevator is stopped. For commerce services class intelligent robot, after it, which obtains elevator, is currently located floor and elevator operation information, you can Suitable elevator is taken in selection exactly.
As shown in Fig. 2 in an embodiment, elevator floor automatic recognition system of the invention includes receiving module 21, obtained Modulus block 22 and generation sending module 23.
Receiving module 21 is used to receive at the lift car that each sound detection device for being arranged on each floor is sent Intensity of sound information at same sound source to each floor.
Specifically, sound detection device is provided with each floor corresponding position, for from lift car The same sound that sound generating apparatus is sent carries out intensity of sound detection, and the intensity of sound information received is sent to reception Module 21.Receiving module 21 carries out data with each sound detection device by communications such as WiFi, bluetooth, 3G/4G Communication.
Acquisition module 22 is connected with receiving module 21, for according to the intensity of sound acquisition of information electricity at each floor Ladder is currently located floor information.
Specifically, because each sound detection device distance means are different from the distance of sound generating apparatus, therefore each sound The intensity of sound for multiple voice signals that sound detection device detects is also different.According to intensity of sound attenuation principle, transmission path More remote, intensity of sound decay is more.Therefore intensity of sound is bigger, show the distance between sound generating apparatus and sound detection device It is nearer.Therefore, when sound generating apparatus and sound detection device are located at same floor, intensity of sound is maximum.Therefore according to described When intensity of sound acquisition of information elevator is currently located floor information, sent out according to floor corresponding to maximum acoustic intensity and sound Position relationship between generating apparatus and sound detection device is currently located floor to obtain elevator.For example, work as sound generating apparatus When being located at same floor relative position with sound detection device, the floor where sound detection device is that elevator is currently located building Layer;, need to be according to sound generating apparatus and sound detection device when sound generating apparatus and sound detection device shift to install Floor where alternate position spike and sound detection device is currently located floor information to obtain elevator.For example, sound detection device is equal It is arranged on floor bottom, when sound generating apparatus is arranged on elevator car roof, the maximum sound detection device institute of intensity of sound It is that elevator is currently located floor to subtract 1 in floor.Sound detection device is arranged at the top of floor, sound generating apparatus is set At lift car bottom, floor where the maximum signal generation apparatus of intensity of sound is that elevator is currently located floor plus 1.
Generation sending module 23 is connected with acquisition module 22, for being currently located floor according to elevator information and the elevator Information generates and sends elevator floor identification information.
Specifically, after acquisition elevator is currently located floor information, control terminal is according to the current institute of elevator information and elevator Elevator floor identification information is generated in floor information, and is sent by way of by radio communications such as WiFi, 3G/4G or bluetooths To equipment such as intelligent robots, to assist it to carry out next step operation.Wherein, elevator information includes elevator location information, numbering Information etc., to be accurately positioned current information.
In one embodiment of the invention, the elevator floor identification information uses XXXXYYYYZZZZAAAA form.Its In, the identification code of position where XXXX represents elevator, such as Shanghai -0021;YYYY represents the building numbering where the elevator, Such as 0001;ZZZZ represents that the use numbering in the building where the elevator, such as No. 2 ladders are expressed as 0002;AAAA represents electricity Ladder is currently located floor information identification code, such as 12 layers are expressed as 0012.Therefore, 4 buildings positions of No. 2 ladders in the building of Shanghai City the 3rd The elevator floor identification information of elevator be represented by 0021000300020004.
In one embodiment of the invention, the acquisition module is additionally operable to be currently located the same of floor information in acquisition elevator When, according to the elevator be currently located floor information variation tendency obtain elevator running state information;The generation is sent Module is used to simultaneously send the running state information and the elevator floor identification information.Specifically, the operation Status information includes up, descending and stopped.When the elevator of acquisition, which is currently located floor information, to be tapered into, judge under elevator OK;When the elevator of acquisition, which is currently located floor information, to be become larger, ascending for elevator is judged;When the elevator of acquisition is currently located building When layer information keeps constant, judge that elevator is stopped.For commerce services class intelligent robot, building is currently located when it obtains elevator After layer and elevator operation information, you can suitable elevator is taken in selection exactly.
It should be noted that it should be understood that the modules of system above division be only a kind of division of logic function, Can completely or partially it be integrated on a physical entity when actually realizing, can also be physically separate.And these modules can be with All realized in the form of software is called by treatment element;All it can also realize in the form of hardware;Can also part mould Block calls the form of software to realize by treatment element, and part of module is realized by the form of hardware.For example, x modules can be The treatment element individually set up, it can also be integrated in some chip of said apparatus and realize, in addition it is also possible to program generation The form of code is stored in the memory of said apparatus, is called by some treatment element of said apparatus and is performed above x moulds The function of block.The realization of other modules is similar therewith.In addition these modules can completely or partially integrate, can also be only It is vertical to realize.Treatment element described here can be a kind of integrated circuit, have the disposal ability of signal.In implementation process, Each step of the above method or more modules can pass through the integrated logic circuit or soft of the hardware in processor elements The instruction of part form is completed.
For example, the above module can be arranged to implement one or more integrated circuits of above method, such as: One or more specific integrated circuits (ApplicationSpecificIntegratedCircuit, abbreviation ASIC), or, one Or multi-microprocessor (digitalsingnalprocessor, abbreviation DSP), or, one or more field-programmable gate array Arrange (FieldProgrammableGateArray, abbreviation FPGA) etc..For another example, some module is dispatched by treatment element more than When the form of program code is realized, the treatment element can be general processor, such as central processing unit (CentralProcessingUnit, abbreviation CPU) or it is other can be with the processor of caller code.For another example, these modules can To integrate, realized in the form of on-chip system (system-on-a-chip, abbreviation SOC).
As shown in figure 3, in an embodiment, control terminal of the invention includes communicator 31, processor 32 and memory 33。
The communicator 31, which is used to receive, is arranged on the lift car that each sound detection device of each floor is sent Locate the intensity of sound information at same sound source to each floor and send elevator floor identification information.
Preferably, the communicator 31 is carried out data transmission by the way of radio communication.
The memory 33 is used to store computer program.
Preferably, the memory 33 includes:ROM, RAM, magnetic disc or CD etc. are various can be with store program codes Medium.
The processor 32 is connected with the communicator 31 and the memory 33, for being believed according to the intensity of sound Breath, the computer program of the memory storage is performed, so that the control terminal performs above-mentioned elevator floor automatic identification side Method.
Preferably, processor 32 can be general processor, including central processing unit (CentralProcessingUnit, Abbreviation CPU), network processing unit (NetworkProcessor, abbreviation NP) etc.;It can also be digital signal processor (DigitalSignalProcessing, abbreviation DSP), application specific integrated circuit (ApplicationSpecificIntegratedCircuit, abbreviation ASIC), field programmable gate array (Field- ProgrammableGateArray, abbreviation FPGA) either other PLDs, discrete gate or transistor logic device Part, discrete hardware components.
As shown in figure 4, in an embodiment, elevator floor automatic recognition system of the invention includes above-mentioned control terminal 41st, sound generating apparatus 42 and some sound detection devices 43.
The sound generating apparatus 42 is arranged in lift car, for generating the sound of fixed frequency.
Some sound detection devices 43 are arranged on each floor corresponding position one by one, are respectively used to generation and are received The intensity of sound information of the sound arrived, and send to the control terminal 41.
Preferably, height of the sound detection device 43 on each floor with the sound generating apparatus 42 described Height on lift car is consistent so that floor corresponding to the maximum signal generation apparatus of intensity of sound is the current institute of elevator In floor.For example, when sound generating apparatus is arranged on elevator car roof, then sound detection device is arranged at the top of hoistway door Corresponding position;When sound generating apparatus is located at lift car bottom, then sound detection device is arranged on hoistway door bottom pair Answer opening position.If the height of the two is inconsistent, need to carry out floor corresponding to the maximum signal generation apparatus of intensity of sound Amendment, floor information is currently located to obtain elevator.
In one embodiment of the invention, the sound detection device is arranged on the preset range on the inside of the entrance hall of each floor It is interior, the size for the intensity of sound for influenceing to receive excessively near too far that sound detection device is set, therefore be in default zone of reasonableness Can.
In summary, elevator floor automatic identifying method of the invention, system and control terminal are according to coming from lift car Same sound source to the intensity of sound of different floors be currently located floor information to obtain elevator;Fast response time, practicality are good; Solve commercial service class intelligent robot when passing in and out elevator or in elevator up and down when accurate judgement be currently located floor The problem of.So the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as Into all equivalent modifications or change, should by the present invention claim be covered.

Claims (8)

  1. A kind of 1. elevator floor automatic identifying method, it is characterised in that:Comprise the following steps:
    Receive and be arranged at the lift car that each sound detection device of each floor is sent same sound source to each floor The intensity of sound information at place;
    Floor information is currently located according to the intensity of sound acquisition of information elevator at each floor;
    Floor information is currently located according to elevator information and the elevator and generates and sends elevator floor identification information.
  2. 2. elevator floor automatic identifying method according to claim 1, it is characterised in that:It is current to be additionally included in acquisition elevator While the floor information of place, the running status that the variation tendency acquisition elevator of floor information is currently located according to the elevator is believed Breath, and the running state information and the elevator floor identification information are sent simultaneously.
  3. A kind of 3. elevator floor automatic recognition system, it is characterised in that:Mould is sent including receiving module, acquisition module and generation Block;
    It is same at the lift car that each sound detection device that the receiving module is arranged on each floor for receiving is sent Intensity of sound information at one sound source to each floor;
    The acquisition module is used to be currently located floor information according to the intensity of sound acquisition of information elevator at each floor;
    The generation sending module generates and sends elevator for being currently located floor information according to elevator information and the elevator Floor identification information.
  4. 4. elevator floor automatic recognition system according to claim 3, it is characterised in that:The identification module is additionally operable to While identification elevator is currently located floor information, the variation tendency that floor information is currently located according to the elevator obtains elevator Running state information, and the running state information and the elevator floor identification information are sent simultaneously.
  5. 5. one kind control terminal, it is characterised in that:Including communicator, processor and memory;
    It is same at the lift car that each sound detection device that the communicator is arranged on each floor for receiving is sent Intensity of sound information and transmission elevator floor identification information at sound source to each floor;
    The memory is used to store computer program;
    The processor is used for the computer program for according to the intensity of sound information, performing the memory storage, so that institute State elevator floor automatic identifying method any one of control terminal perform claim requirement 1 to 2.
  6. A kind of 6. elevator floor automatic recognition system, it is characterised in that:Including controlling terminal, sound to occur described in claim 5 Device and some sound detection devices;
    The sound generating apparatus is arranged in lift car, for generating the sound of fixed frequency;
    Some sound detection devices are arranged on each floor corresponding position one by one, are respectively used to generate received institute The intensity of sound information of sound is stated, and is sent to the control terminal.
  7. 7. elevator floor automatic recognition system according to claim 6, it is characterised in that:The sound generating apparatus is in electricity Height and the sound detection device on terraced car is consistent in the height of current floor.
  8. 8. elevator floor automatic recognition system according to claim 6, it is characterised in that:The sound detection device is set In the preset range on the inside of the entrance hall of each floor.
CN201710911908.1A 2017-09-29 2017-09-29 A kind of elevator floor automatic identifying method, system and control terminal Pending CN107826917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710911908.1A CN107826917A (en) 2017-09-29 2017-09-29 A kind of elevator floor automatic identifying method, system and control terminal

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Application Number Priority Date Filing Date Title
CN201710911908.1A CN107826917A (en) 2017-09-29 2017-09-29 A kind of elevator floor automatic identifying method, system and control terminal

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CN107826917A true CN107826917A (en) 2018-03-23

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DE102021103038A1 (en) 2020-02-10 2021-08-12 Metralabs Gmbh Neue Technologien Und Systeme Method and system for moving a robot in an elevator
US11518650B2 (en) 2018-06-15 2022-12-06 Otis Elevator Company Variable thresholds for an elevator system

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11518650B2 (en) 2018-06-15 2022-12-06 Otis Elevator Company Variable thresholds for an elevator system
DE102021103038A1 (en) 2020-02-10 2021-08-12 Metralabs Gmbh Neue Technologien Und Systeme Method and system for moving a robot in an elevator
WO2021160623A1 (en) 2020-02-10 2021-08-19 Metralabs Gmbh Neue Technologien Und Systeme Method and a system for conveying a robot in an elevator
EP4524078A2 (en) 2020-02-10 2025-03-19 MetraLabs GmbH Neue Technologien und Systeme Method and a system for positioning a robot near an elevator

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Application publication date: 20180323

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