EP3974367B1 - Method of calibraring a load weighing device of an elevator system and elevator system - Google Patents

Method of calibraring a load weighing device of an elevator system and elevator system Download PDF

Info

Publication number
EP3974367B1
EP3974367B1 EP20198412.7A EP20198412A EP3974367B1 EP 3974367 B1 EP3974367 B1 EP 3974367B1 EP 20198412 A EP20198412 A EP 20198412A EP 3974367 B1 EP3974367 B1 EP 3974367B1
Authority
EP
European Patent Office
Prior art keywords
elevator
car
load
load information
elevator system
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.)
Active
Application number
EP20198412.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3974367A1 (en
Inventor
Ari Kattainen
Juha-Matti Aitamurto
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.)
Kone Corp
Original Assignee
Kone Corp
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 Kone Corp filed Critical Kone Corp
Priority to EP20198412.7A priority Critical patent/EP3974367B1/en
Priority to CN202111097213.7A priority patent/CN114249198A/zh
Publication of EP3974367A1 publication Critical patent/EP3974367A1/en
Application granted granted Critical
Publication of EP3974367B1 publication Critical patent/EP3974367B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/3407—Setting or modification of parameters of the control system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
    • B66B1/28—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical
    • B66B1/30—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/3415—Control system configuration and the data transmission or communication within the control system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/3476—Load weighing or car passenger counting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/14—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of excessive loads

Definitions

  • This invention relates to a solution for operating an elevator system in a safe and efficient way. More particularly, the solution makes it possible to obtain correct information about the status of the elevator system while it is being operated.
  • Elevator brakes are dimensioned for a specific full load rating, which should not be exceeded for safety reasons and for the comfort of the passengers. Additionally, elevator systems are utilizing solutions for automatic monitoring and testing of brakes. In order to obtain reliable data from this monitoring and testing it is important to know what the actual load is during the testing of brakes.
  • elevator systems are provided with load weighing devices (LWD) to measure the elevator car-load.
  • LWD load weighing devices
  • the car-load information is provided to an elevator control unit, which is provided with a user interface having manual potentiometers or other means facilitating, that service personnel may calibrate the car-load measurement result manually at different elevator-car positions and with different loads.
  • This requires, that different reference weights are loaded to the elevator car in turns, in order to obtain required measurement results for different loads at different positions.
  • a drawback with the previously known solution is that it is very laborious and time-consuming, in particular as the calibration occasionally needs to be repeated. This may become necessary in case modifications are done to the elevator car, to the counterweight or to the ropes of the elevator system, for instance.
  • An object of the present invention is to solve the above-mentioned drawback and to provide a simple and efficient solution for obtaining correct information about the status of an elevator system. This object is obtained with a method according to independent claim 1 and an elevator system according to independent claim 9, where calibration data for the car-load information is calculated based on motor-load information by taking into account the unbalance and uncompensation at the position.
  • Figure 1 illustrates a method for operating an elevator system which is suitable for use in the elevator system 1 illustrated in Figure 2 , for instance.
  • step A the unbalance between the weight of an elevator counterweight 2 and the weight of an empty elevator car 3 is determined. This can be done by measuring motor 4 current, in other words motor-load, during up and down test runs of the empty elevator 3 car before launching said first elevator run (for transportation use) and by storing the determined unbalance information into a memory 16 of the elevator system 1.
  • the unbalance may be determined for the first time when the elevator system in question is taken into use after installation. If needed, the measurements can be later repeated.
  • step B the uncompensation of the elevator system masses at different positions of the elevator shaft is determined. Also this step can be done before launching a first elevator run (for transportation use) after installation of the elevator system, at which stage the unbalance information is stored into a memory of the elevator system, such as into a memory 16 of a calibration unit 14.
  • the uncompensation of the elevator system depends on the weight difference of hoisting ropes 6, 7 hanging on different sides of a traction sheave 5.
  • the uncompensation changes. Consequently, the uncompensation is different when the elevator is at different positions.
  • step B the uncompensation can be determined from US2019330016A1 equation 3.2. (referred to as compensation error ⁇ B therein).
  • the measurements may be carried out at at least two different positions with the load weighting device 11 or with other suitable measuring means, such as by means of the motor-load information while holding the elevator car standstill at the positions 9 and 10 during measurement, it is assumed that the uncompensation varies linearly between these positions. This makes it possible to calculate the uncompensation at any point between these positions 9 and 10 by taking into account the distance between these points.
  • step B it may be sufficient in step B to determine this and that the uncompensation is zero or so small that it can be neglected.
  • step C car-load information is obtained from the load weighting device before launching the first elevator run (for transportation use).
  • the weighting device 11 is a load cell connected to a rope hitch of elevator hoisting ropes 6, while the second alternative illustrated position for a load weighting device 12 is in connection with the elevator car 3 floor, which may be suspended by springs, for instance, such that it becomes possible to measure the load on the elevator floor.
  • the car-load information may be obtained from the load weighting device 11 or 12 to an input 13 of a calibration unit 14 included in an elevator control 15.
  • step D a check may be performed to ensure that the car-load is below an overload threshold value. This check may be carried out by the elevator control 15. In case the car-load is not below the overload threshold value, a launch of an elevator run may be prevented.
  • Elevator systems are manufactured with a rated load and operation of the elevator system should not be allowed in case the car-load is too big. Consequently, the elevator control may maintain in a memory 16 an overload threshold value, which is compared to the obtained car-load information to determine if launch of the elevator run is allowed. In some cases, it may be preferable to set the overload threshold value slightly above the rated load of the elevator system. One alternative is to set the overload threshold value to be 110% of the rated load of the elevator system. In some alternative cases the overload threshold value is set just higher that the rated load but less that the 110 % limit.
  • step E the first elevator run (for transportation use) is launched.
  • step F motor-load information is obtained an elevator drive unit 17 based on realized motor current during launch of the first elevator run.
  • the elevator drive unit 17 may be a part of the elevator control 15 and it may include a frequency controller for controlling the electric motor 4 of the elevator system, for instance.
  • One alternative is that, after launch of the first elevator run, the elevator car is kept standstill at the launch position with torque from the elevator drive unit 4, 17.
  • said holding torque is consistent with the motor current. This is in particular the case with synchronous permanent magnet motors.
  • step G calibration data is calculated for the car-load information based on a difference between the car-load information and the motor-load information.
  • the elevator system is provided with one or more position sensors 17 providing an input 18 of the calibration unit 14 with an indication of the position of the elevator car 3.
  • the location or type of the position sensor or sensors may vary depending on the implementation.
  • step H the calculated calibration data is utilized to correct car-load information from the load weighting device 11, 12 in connection with subsequent runs, preferably during normal elevator operation. Consequently, an inaccuracy regarding the weight of the loaded elevator car can be minimized and eliminated, which makes the elevator run more comfortable for the user, improves the safety of the brakes during use and also makes automatic testing of the brakes more reliable.
  • the illustrated calibration unit may be configured to automatically repeat calculation of the calibration data for the car-load information and take into use the new calculated calibration data. Such calculations may be carried out for each run, or periodically according to a predefined schedule, for instance.
  • the elevator system may be provided with a user interface 19 connected to the elevator control 15 such that maintenance personnel can provide a control command via the user interface 19 to control the calibration unit to repeat the calculation of the calibration data.
EP20198412.7A 2020-09-25 2020-09-25 Method of calibraring a load weighing device of an elevator system and elevator system Active EP3974367B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20198412.7A EP3974367B1 (en) 2020-09-25 2020-09-25 Method of calibraring a load weighing device of an elevator system and elevator system
CN202111097213.7A CN114249198A (zh) 2020-09-25 2021-09-18 操作电梯系统的方法和电梯系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20198412.7A EP3974367B1 (en) 2020-09-25 2020-09-25 Method of calibraring a load weighing device of an elevator system and elevator system

Publications (2)

Publication Number Publication Date
EP3974367A1 EP3974367A1 (en) 2022-03-30
EP3974367B1 true EP3974367B1 (en) 2024-01-17

Family

ID=72659642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20198412.7A Active EP3974367B1 (en) 2020-09-25 2020-09-25 Method of calibraring a load weighing device of an elevator system and elevator system

Country Status (2)

Country Link
EP (1) EP3974367B1 (zh)
CN (1) CN114249198A (zh)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5343003A (en) * 1992-05-29 1994-08-30 Otis Elevator Company Recalibration of hitch load weighing using dynamic tare
EP2998259A1 (en) * 2014-09-18 2016-03-23 Kone Corporation An elevator system and a method for controlling elevator safety
KR20190051063A (ko) * 2016-11-01 2019-05-14 미쓰비시덴키 가부시키가이샤 엘리베이터 장치, 및 저울 장치의 교정 방법
WO2018145734A1 (en) 2017-02-08 2018-08-16 Kone Corporation Method for determining the weight of the car and counterweight in an elevator

Also Published As

Publication number Publication date
EP3974367A1 (en) 2022-03-30
CN114249198A (zh) 2022-03-29

Similar Documents

Publication Publication Date Title
US6325179B1 (en) Determining elevator brake, traction and related performance parameters
FI118684B (fi) Menetelmä ja järjestelmä hissin jarrujen kunnon testaamiseksi
US4793442A (en) Method and apparatus for providing pre-travel balancing energy to an elevator drive
JP3936578B2 (ja) エレベータ巻上機・制御システム
WO2015144989A1 (en) A method and apparatus for automatic elevator drive configuration
US20150259174A1 (en) Condition monitoring of vertical transport equipment
TWI377168B (en) Automatic inspecting device for an elevator and automatic inspecting method for an elevator
US4674605A (en) Automatic elevator load sensor calibration system
CN109890740B (zh) 电梯装置、以及秤装置的校正方法
JPWO2019167212A1 (ja) エレベーターのブレーキ性能評価装置
CN102471013B (zh) 电梯控制装置
US20190330016A1 (en) Method for determining the weight of the car and counterweight in an elevator
EP3974367B1 (en) Method of calibraring a load weighing device of an elevator system and elevator system
US20200346892A1 (en) Method and apparatus for detecting the position of an elevator
JP4727234B2 (ja) エレベータ装置
JP4295067B2 (ja) エレベーター秤装置特性測定システム
KR100958298B1 (ko) 승강기 언밸런스하중 및 최대적재하중 측정방법 및 장치
US20210331892A1 (en) Method for testing safety characteristics of an elevator
KR101015054B1 (ko) 승강기 언밸런스하중 및 최대적재하중 측정방법 및 장치
CN111348511B (zh) 一种基于电梯平衡系数的电梯制动力精确检测方法
CN109484942A (zh) 用于曳引绳断裂检测并触发制动的装置及方法
JP6740324B2 (ja) 乗りかごの重量計測方法および装置
JP2011148632A (ja) エレベータの制御システム
JP7261190B2 (ja) エレベーター診断装置、エレベーターの荷重検出装置の診断方法及びエレベーターシステム
WO2012160888A1 (ja) エレベーター装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20210708

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20220926

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230525

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20230829

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602020024418

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D