CN100546896C - The safety detection device of door of elevator waiting hall and method of inspection thereof - Google Patents
The safety detection device of door of elevator waiting hall and method of inspection thereof Download PDFInfo
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- CN100546896C CN100546896C CNB2007100380123A CN200710038012A CN100546896C CN 100546896 C CN100546896 C CN 100546896C CN B2007100380123 A CNB2007100380123 A CN B2007100380123A CN 200710038012 A CN200710038012 A CN 200710038012A CN 100546896 C CN100546896 C CN 100546896C
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Abstract
The invention discloses a kind of safety detection device and method of inspection thereof of door of elevator waiting hall, at each waiting hall door place one mechanical switch is installed, this mechanical switch is closed under Room door is closed the door state fully, disconnects when opening the door.The stop signal processor unit reads in the mechanical switch signal, and with serial communication mode this signal is sent into electric life controller.Electric life controller obtains the car position and the relevant information of elevator voluntarily in real time, and according to the car position of elevator and the state of relevant information and each layer Room door mechanical switch, makes safe judgement.Though the present invention can detect that the layer Room, non-lift car place door is opened and lift car at certain layer but can not open the door the zone and dangerous incident that this layer Room door is opened at this layer, effectively improves the elevator safety performance.
Description
Technical field
The present invention relates to a kind of safety detection device of elevator, particularly relate to a kind of door of elevator waiting hall that detects by the dangerous device of opening.The invention still further relates to the safety detection method of door of elevator waiting hall.
Background technology
In order to protect the safety of elevator operation, need the Room door of gate and each stop be detected, have only after the Room door of the gate of elevator and all stops is all closed, elevator could starting operation, and the elevator safety standard of various countries has all been made strict regulation to this.For tackling this regulation, the general safety return circuit of being made up of mechanical switch that adopts as shown in Figure 1 detects the Room door and the gate of elevator.Have only after the whole loop conducting of all switch closures, the Room door and the gate that just are considered as elevator are closed, and elevator could starting operation.But some country has higher safety requirements.Such as stipulating clearly in the national lift facility standard that has that the safety detection device of elevator should detect the Room door of elevator by artificial dangerous opening, and stops the elevator operation, up to the operation that is recovered elevator by machine room.This just requires to stop except that car is current, and the Room door of other layer the layer is opened and car is positioned at and currently stops layer but can not open the door the zone and situation that this layer Room door is opened all should be detected at this layer.Existing device shown in Figure 1 can't satisfy this requirement.For example, when elevator stops in the 2nd buildings, gate switch GS disconnects, or Room door switch DS-2 disconnects, or the Room door switch DS-n of any one other layer disconnection, all causing the disconnection in whole loop, the safety device of elevator can only be known has door to be opened, but can't know that the normal safety of this time opening the door is opened the door or unsafe opening the door, especially elevator are closed again after whether other waiting hall door is opened stopping can't detect under layer door opening state.
Chinese invention patent ublic specification of application CN1265371A (open day: on September 6th, 2000) disclose a kind of elevator safety detecting device (referring to Fig. 2).This device respectively increases by two dry-reed tube GAN, GBN and a permanent magnet at each stop, and a permanent magnet is installed on lift car, is used to detect the layer Room, non-car place door and opens.The problem that this device exists is: (1) productive costs is higher; The installation and maintenance more complicated.(2) limited by the magnetic field of permanent magnet scope, satisfy some elevator functions and have difficulties, as the advance door opening and the story-leveling function again that opens the door.(3) may there be electromagnetic interference in permanent magnet to the lift car in other electronicies package in the elevator hoistways and the motion.(4) because the door district of elevator is very accurate, and the uncertainty of magnetic field of permanent magnet sphere of action and installation site, whether being parked in a district for elevator can't accurately discern, so this device can only detect non-car place waiting hall door and open, though and can not detect car and can not open the door the zone and situation that this layer Room door is opened at this layer at the current layer that stops.
Chinese invention patent ublic specification of application CN1475429A (open day: on February 18th, 2004) disclose another kind of elevator safety detecting device (referring to Fig. 3).This device is provided with standard machinery switch ADS-n, the DS-n ' of two parallel connections at each stop, and the mechanical switch with each stop is in series again, and its break-make is respectively by each layer Room door and gate control.This installation cost is relatively low, does not also have problems such as electromagnetic interference.But may have disconnection in short-term by the safety return circuit that switch is formed, therefore need do corresponding the adjustment to the operating position of two switches, the turnoff time that whole safety return circuit may occur during with control normal switch door, electric life controller also will be made shield detection in short-term to this disconnection, to avoid that erroneous judgement is made in normal switch door action.This is with the complexity of increase system control.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of safety detection device of door of elevator waiting hall, can effectively detect door of elevator waiting hall and be opened by dangerous, improves the safety performance of elevator; The present invention also will provide a kind of safety detection method of door of elevator waiting hall for this reason.
For solving the problems of the technologies described above, the safety detection device of door of elevator waiting hall of the present invention comprises the mechanical switch that is installed in each waiting hall door place, described mechanical switch is by Room gate control, this mechanical switch closure under Room door is closed the door state fully, and this mechanical switch disconnected when Room door opened the door; Also comprise the stop signal processor unit that is arranged on each stop, this stop signal processor unit comprises a master cpu at least, and the serial communication controller of a responsible serial communication is with described master cpu bonded assembly I/O interface;
Described mechanical switch inserts an input port in the I/O interface; Master cpu is periodically gathered the incoming signal of I/O interface, and this incoming signal is processed into communication message, sends into serial communication controller, and this serial communication controller sends to electric life controller with this message in the mode of serial communication;
Described electric life controller comprises serial communication part (being designated hereinafter simply as the ST part) and elevator operation control part (being designated hereinafter simply as the CC part); The CC part of electric life controller is sent into the various information of receiving on the ST partial periodicity ground of electric life controller; This CC part is after periodically obtaining Room door status information and elevator car position and relevant information thereof in real time, whether waiting hall door that detect to judge non-lift car position is opened, and lift car at certain layer but can not open the door the zone and situation that this layer Room door is opened at this layer.
The safety detection method of door of elevator waiting hall of the present invention comprises the steps that at first, electric life controller detects elevator and whether shut down by dangerous opening because detect the waiting hall door; If stopped then keeping standing state to jump out testing process; Whether if be not in stopped status, then detecting has Room door to be opened; If do not have Room door to be opened, then jump out testing process; If there is Room door to be opened, whether then detect elevator in the zone of can not opening the door, if elevator in the zone of can not opening the door, and Room door is opened, then the CC of electric life controller part stops the elevator operation with trigger action; If elevator is parked in the zone of can opening the door,, promptly the bit information of reflection car floor position and reflection Room door state is carried out " position or " operation then by comparison car floor position and Room door open mode; If all positions of the resultant bitstream that obtains all are 1, then think normal, otherwise the situation that just exists the waiting hall door of non-lift car position to be opened, described CC part stops the elevator operation with trigger action.
The invention has the beneficial effects as follows: guarantee except the normal flat bed of elevator opens the door, all unsafe Room doors are opened and can both be detected, the Room door that comprises non-lift car place stop is opened, with elevator be positioned at certain the layer but not this layer can open the door the zone and by the people for opening Room door, improved the safety performance of elevator.Open the door when shutting down because of dangerous at elevator, electric life controller can immediate record under the switch door information of each Room door, use during in order to the investigation problem.In addition, because the present invention only increases single raise standard machinery contact at each waiting hall door place, other required signals all can utilize elevator self existing device and technology to obtain, and can not bring extra interference and compatibility issue like this, reliability height and cost is lower.Need not change and to realize for functions such as the similar advance door opening and the flat beds that opens the door again.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and the specific embodiment:
Fig. 1 is existing a kind of elevator safety detecting device schematic diagram;
Fig. 2 is existing another kind of elevator safety detecting device schematic diagram;
Fig. 3 is existing another elevator safety detecting device schematic diagram;
Fig. 4 is the serial communication message that each signal processor unit of standing layer by layer among the present invention is made according to the mechanical switch signal that receives;
Fig. 5 is that the electric life controller ST lateral root among the present invention is stood message that signal processor unit sends layer by layer according to each that receives and each Room door status bits stream of making;
Fig. 6 is the safety detection device schematic diagram of door of elevator waiting hall of the present invention;
Fig. 7 is the safety detection method diagram of circuit of door of elevator waiting hall of the present invention;
Fig. 8 is the constructional drawing of the original floor call device of elevator;
Fig. 9 is the general structural representation of elevator floor stops signal processor unit of the present invention;
Figure 10 is elevator car position information and the opened the door zone of elevator and the area schematic of can not opening the door that the electric life controller CC side among the present invention obtains;
Figure 11 is that the waiting hall gate control mechanical switch among the present invention disconnects and closed rough schematic view.
The specific embodiment
As shown in Figure 6, the safety detection device of door of elevator waiting hall of the present invention comprises the mechanical switch DS-N that is installed in each waiting hall door place, described mechanical switch DS-N is by Room gate control, collision block 10 pressing mechanical switch DS-N make switch closure under Room door is closed the door state fully, collision block 10 broke away from mechanical switch DS-N when Room door opened the door, and the contact of mechanical switch DS-N disconnects switch because of spring stretches.Figure 11 has represented the principle of work of this simple mechanism.Figure 11 (a) is illustrated in Room door and closes the door fully that collision block 10 pressing mechanical switch DS-N make switch closure under the state; Collision block 10 disengaging mechanical switch DS-N disconnected switch when Figure 11 (b) expression Room door opened the door.
The present invention also comprises the stop signal processor unit HS-N that is arranged on each stop, and this stop signal processor unit HS-N can adopt the original floor call device of elevator.Fig. 8 has represented the structure of the original floor call device of elevator.This device has a master cpu (being HS-CPU among the figure), the serial communication controller of a responsible serial communication, the I/O interface is used to receive peripheral contact signal and outside output signal, also has a matrix display to be used to show current floor of elevator and elevator service direction in addition.Wherein the I/O interface comprises a plurality of input interfaces, can receive a plurality of contact signals that comprise the floor call button.Described mechanical switch DS-N can insert one of them input port.Master cpu (HS-CPU) is periodically gathered the incoming signal of I/O interface, and this incoming signal is processed into the communication message shown in Fig. 4 (a), periodically send into serial communication controller again, at last periodically be responsible for this message is sent to electric life controller in the mode of serial communication by serial communication controller.If the stop signal processor unit does not adopt the original floor call device of elevator, can adopt structure shown in Figure 9 so, to compare with Fig. 8 and saved matrix display, its principle of work is identical.
The communication message form that is made by master cpu in the stop signal processor unit as shown in Figure 4.Wherein Fig. 4 (a) is the serial communication message of Room door state, and header is represented the floor position of stop signal processor unit, and what closely follow later is Room door status information.When Room door was opened, mechanical switch DS-N disconnected, and after master cpu receives the voltage step-down of input port, is " 00H " with this status indication; When Room door is closed fully, mechanical switch DS-N closure, the voltage that master cpu receives input port uprises and is+5V, then with this state with " FFH " expression.Fig. 4 (b) expression be 2 balcony doors that 2 floor station signal processor unit the make serial communication messages when being opened.Fig. 4 (c) expression be 3 balcony doors that 3 floor station signal processor unit the make serial communication messages when closing fully.
Described electric life controller comprises that the ST partial sum of being responsible for serial communication is responsible for the CC part of elevator operation control.Described stop signal processor unit HS-N periodically partly communicates with the ST of electric life controller by its serial communication controller.The CC part of electric life controller is sent the various information of receiving in the ST partial periodicity ground of electric life controller, has wherein also comprised the status information of sending from stop signal processor unit HS-N about the mechanical switch DS-N that is installed in Room door.Fig. 5 (a)～Fig. 5 (c) is the ST part of electric life controller among the present invention, according to the Room door message information of each stop signal processor unit of receiving, makes and will give the stream of bits of CC each layer Room door state partly of electric life controller.Wherein, the Room door state of each floor represents with a bit, and " 1 " represents that this layer Room door closes fully, and " 0 " represents that this layer Room door opens.All closing such as the Room door of supposing each layer earlier, ST has partly made the stream of bits as Fig. 5 (a), and all bits all are 1.Door is opened when the Room in the 2nd buildings, then ST partly receives the information of sending from 2 floor station signal processor unit HS-2 shown in Fig. 4 (b), ST partly becomes 0 with the position, the 2nd building of original stream of bits by 1 then, and promptly the stream of bits of Fig. 5 (a) has become the stream of bits of Fig. 5 (b).If at this moment the Room door in the 3rd buildings has also been opened, will obtain the stream of bits of Fig. 5 (c).So Fig. 5 (a) has represented the situation that each waiting hall door is all closed fully, the situation that Fig. 5 (b) expression has only 2 balcony doors to be opened, the situation that Fig. 5 (c) expression the 2nd buildings and 3 balcony doors all are opened.At last, the ST part sends to the stream of bits of making the CC part of electric life controller.
The CC of electric life controller partly is a most important part of being responsible for the elevator master control.In all elevator devices, electric life controller must be known the lift car position constantly, otherwise elevator just can't move; Simultaneously, electric life controller must know in real time also whether elevator stops at level position, and promptly whether elevator stops at the zone of can opening the door, otherwise elevator just can't safe switch door.So all elevator devices have all been done corresponding design to obtain these information in real time for this reason.That is to say that elevator car position and relevant information thereof (these information comprise car place floor, and whether car is positioned at the zone or the like of can opening the door) all are that the elevator original system can access also is the key message that must obtain.The present invention has directly used these important informations, and no longer increases the additional detections means.When how concrete enforcement obtained these information, various elevators had adopted diverse ways; How obtaining these information about elevator device is not discussion category of the present invention, and the present invention only uses its final result who detects, and promptly the CC of electric life controller part can be obtained elevator car position and relevant information thereof in real time.Figure 10 has represented these information that the CC of electric life controller partly obtains.Wherein Figure 10 (a) expression is the bit stream information that lift car is on the second storey, and when lift car during at certain floor, the pairing position of this floor is 1, and other positions are 0; In the under any circumstance whole data bit flow, having and have only a position is 1.Because lift car must have a position, and can only be in some positions.What Figure 10 (b) represented is the method whether a kind of existing identification lift car is positioned at the zone of can opening the door.Magnetic isolation plate DZ1 and DZ2 are contained in the elevator hoistways, are used for the identification zone of can opening the door, and each floor is all installed a cover, when lift car through or when arriving the magnetic isolation plate DZ1 of each layer and DZ2, electric life controller all can perceive the magnetic isolation plate DZ1 and the DZ2 of this layer.Wherein, zone 2 is overlapping regions of magnetic isolation plate DZ1 and DZ2, and this is the zone of normal switch door; Zone 1 and 3 is in magnetic isolation plate DZ1 and DZ2 scope, but the nonoverlapping zone of magnetic isolation plate DZ1 and DZ2, this is opened the door zone in case of emergency; Zone 4 and 5 is the zones outside magnetic isolation plate DZ1 and the DZ2, and this is the zone that can not open the door.Therefore detect in the scope that lift car is in magnetic isolation plate DZ1 or DZ2 when electric life controller, i.e. zone 1,2 or 3 o'clock, to think that lift car is in the zone of can opening the door, and detect outside the scope that lift car is in magnetic isolation plate DZ1 or DZ2 when electric life controller, promptly zone 4 or 5 o'clock just thinks that lift car is in the zone of can not opening the door.
The CC of described electric life controller part just can be made safe judgement after periodically having obtained Room door status information and elevator car position and relevant information thereof in real time.Have two in the detection judgement: the waiting hall door of (1) non-lift car position is opened; (2) lift car at certain layer but can not open the door the zone and situation that this layer Room door is opened at this layer.The concrete method of judging as shown in Figure 7.At first, whether electric life controller detection elevator is shut down by dangerous opening because detect the waiting hall door.If stopped then keeping existing (stopping) state to jump out testing process.If be not in stopped status, whether have Room door be opened, promptly detect the situation of change of stream of bits shown in Figure 5 if then detecting.If there is not Room door to be opened, promptly Room door status bits stream remains on the state of Fig. 5 (a) and does not change, and then continues the necessity that detects and jumps out testing process.Whether if there is Room door to be opened, promptly stream of bits no longer is the state of Fig. 5 (a), whether then detects elevator in the zone of can opening the door, promptly observe elevator and be among the regional 1-3 shown in Figure 10 (b).If elevator is in the zone of can not opening the door, promptly elevator is among the zone 4 or 5 shown in Figure 10 (b), and Room door is opened (state that Room door status bits stream fails to keep Fig. 5 (a)), and then the CC part stops the elevator operation with trigger action.If elevator is parked in the zone of can opening the door, be that elevator is among the regional 1-3 shown in Figure 10 (b), then open situation, promptly the bit information of Fig. 5 of Figure 10 (a) of reflection car floor position and reflection Room door state is carried out " position or " and operate by comparison car floor position and Room door; If all positions of the resultant bitstream that obtains all are 1 (as Fig. 5 (a)), then think normal, otherwise the situation that just exists the waiting hall door of non-lift car position to be opened, the CC part stops the elevator operation with trigger action.The bit information of Figure 10 (a) and the bit information of Fig. 5 (b) have partly been obtained such as CC, both are got " position or " operation, the result who obtains is that all bits the same with Fig. 5 (a) all are 1 stream of bits, the Room door of then thinking car place floor is opened, promptly the Room door in the 2nd buildings be opened and elevator in the 2nd buildings, then finish this testing process.The bit information of Figure 10 (a) and the bit information of Fig. 5 (c) have partly been obtained such as CC again, get " position or " operation, the result who obtains shows that the bit in the 3rd buildings is 0, shows that then the Room door in the 3rd buildings has been opened by unsafe, thereby the CC part should stop the elevator operation by trigger action.In addition, when triggering the elevator shutdown operation, the CC of electric life controller part can be noted the information of all Room doors that are opened at that time, shown in Fig. 5 (c), uses during in order to the investigation problem.
Be specifically described below in conjunction with an embodiment.
In the present embodiment, suppose to use the original floor call device of elevator, elevator car position is the opened the door zone in the 2nd buildings simultaneously, and electric life controller has been known these situations in real time, and obtains the information as Figure 10.If the Room door in the 2nd buildings is opened, mechanical switch DS-2 will disconnect so, floor call device HS-2 can record this variation immediately, and makes the message of Fig. 4 (b), and the information that 2 balcony doors is opened by its serial communication controller is sent into the ST part of electric life controller.ST part then can be made the bit stream information of Fig. 5 (b), and this stream of bits is sent into the CC part of electric life controller, and the CC of electric life controller part has been obtained the status information of each waiting hall door again thus.Described CC is the information by comparison Figure 10 (a) and Fig. 5 (b) (promptly " or " operates) partly, has obtained all bits and be 1 result, and thought that thus opening the door specifically is that safety in this stop of lift car door district is opened the door.If the Room door in the 2nd buildings and the 3rd buildings is opened simultaneously, the ST of electric life controller part can be made as Fig. 5 (c) bit stream information and be sent into the CC part of electric life controller; Partly by comparison, just can obtain not is that all bits are 1 result to described CC, and promptly the bit in the 3rd buildings is 0, and at this moment the CC of electric life controller thinks that partly such opening the door is unsafe and stops the elevator operation immediately.Certainly, if having only the Room door in the 3rd buildings to be opened, the final bit that also can obtain the 3rd buildings of CC part is 0 result, and at this moment the CC part thinks that still such opening the door is unsafe and stops the elevator operation immediately.
If elevator car position is positioned at the 2nd buildings not in the zone of can opening the door.At this moment, all waiting hall doors all should be closed, and it is safe promptly to have only the situation of Fig. 5 (a) to be only, the Room door of any one floor be opened all will be considered to be unsafe.If the waiting hall door status bits stream information that CC partly obtains is not the situation of Fig. 5 (a), electric life controller can stop the elevator operation immediately so.When electric life controller detects elevator because the waiting hall door is stopped by dangerous opening, then will continue the halted state of maintenance elevator, until staff's elevator that resets.In addition, when shutting down, being similar to Fig. 5 (c) bit stream information can be got off by the CC partial record of electric life controller, uses during in order to the investigation problem.
In sum, the present invention have with low cost, be easy to realization and transformation, Detection of content fully, Detect effective, reliability is high and original elevator device is not had the characteristics such as adverse effect, be applicable to The lifting passenger-goods lift of various use serial communication systems.
Claims (3)
1, a kind of safety detection device of door of elevator waiting hall comprises the mechanical switch that is installed in each waiting hall door place, and described mechanical switch is by Room gate control, this mechanical switch closure under Room door is closed the door state fully, and this mechanical switch disconnected when Room door opened the door;
Also comprise the stop signal processor unit that is arranged on each stop, this stop signal processor unit comprises a master cpu at least, and the serial communication controller of a responsible serial communication with described master cpu bonded assembly I/O interface, is characterized in that:
Described mechanical switch inserts an input port in the described I/O interface; Master cpu is periodically gathered the incoming signal of I/O interface, and this incoming signal is processed into communication message, sends into serial communication controller, and this serial communication controller sends to electric life controller with this message in the mode of serial communication;
Described electric life controller comprises serial communication partial sum elevator operation control part; The elevator operation control part of electric life controller is sent into the various information of receiving on the serial communication partial periodicity ground of electric life controller; This elevator operation control part is after periodically obtaining Room door status information and elevator car position and relevant information thereof in real time, whether waiting hall door that detect to judge non-lift car position is opened, and lift car at certain layer but can not open the door the zone and situation that this layer Room door is opened at this layer.
2, a kind of safety detection method of door of elevator waiting hall is characterized in that: at first, whether electric life controller detects elevator and is shut down by dangerous opening because detect the waiting hall door; If stopped then keeping standing state to jump out testing process; Whether if be not in stopped status, then detecting has Room door to be opened; If do not have Room door to be opened, then jump out testing process; If there is Room door to be opened, whether then detect elevator in the zone of can not opening the door, if elevator in the zone of can not opening the door, and Room door is opened, then the elevator of electric life controller operation control part will make elevator out of service; If elevator is parked in the zone of can opening the door, then compare car floor position and Room door open mode, promptly the bit information of reflection car floor position and reflection Room door state is carried out " position or " operation; If all positions of the resultant bitstream that obtains all are 1, and are then normal, otherwise the situation that just exists the waiting hall door of non-lift car position to be opened, described elevator operation control part is out of service with elevator.
3, the safety detection method of door of elevator waiting hall as claimed in claim 2 is characterized in that: when triggering the elevator shutdown operation, the elevator of electric life controller operation control part is noted the information of all Room doors that are opened at that time.
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Cited By (2)
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| US10829344B2 (en) | 2017-07-06 | 2020-11-10 | Otis Elevator Company | Elevator sensor system calibration |
| US11014780B2 (en) | 2017-07-06 | 2021-05-25 | Otis Elevator Company | Elevator sensor calibration |
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| CN102085990A (en) | 2011-02-10 | 2011-06-08 | 重庆和航科技有限公司 | Intelligent warning system for abnormal opening of lift door and safety detecting method thereof |
| CN102602769A (en) * | 2012-03-17 | 2012-07-25 | 苏州莱茵电梯制造有限公司 | Intelligent elevator control system |
| CN103010889B (en) * | 2012-12-20 | 2016-05-11 | 日立电梯(上海)有限公司 | Detection alarm device and implementation method that hoistway door is opened extremely |
| CN103449276B (en) * | 2013-09-23 | 2016-03-30 | 日立电梯（中国）有限公司 | Elevator safety precaution system |
| CN104071669A (en) * | 2014-06-25 | 2014-10-01 | 深圳市云特科技有限公司 | Early-warning device for abnormal opening of elevator landing door |
| CN104192665B (en) * | 2014-08-25 | 2016-12-28 | 宁夏电通物联网科技股份有限公司 | Hoistway door detection warning system and method |
| ES2972555T3 (en) * | 2015-11-18 | 2024-06-13 | Otis Elevator Company | Elevator shaft access security |
| CN105460725B (en) * | 2016-01-20 | 2018-05-08 | 孟令海 | Elevator door state monitor and its fault judgment method |
| CN109250600B (en) * | 2018-10-31 | 2020-07-21 | 住友富士电梯有限公司 | Early warning system and elevator that open door by mistake of hoistway door |
| CN109179174B (en) * | 2018-10-31 | 2021-02-09 | 住友富士电梯有限公司 | Hoistway door mis-opening protection system and elevator |
| CN112299174B (en) * | 2019-07-29 | 2022-04-12 | 上海三菱电梯有限公司 | Elevator car access & exit monitoring system |
| CN114572785A (en) * | 2022-03-17 | 2022-06-03 | 日立楼宇技术（广州）有限公司 | Elevator control method, device, equipment and storage medium |
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2007
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10829344B2 (en) | 2017-07-06 | 2020-11-10 | Otis Elevator Company | Elevator sensor system calibration |
| US11014780B2 (en) | 2017-07-06 | 2021-05-25 | Otis Elevator Company | Elevator sensor calibration |
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| CN101264839A (en) | 2008-09-17 |
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