EP0757966A1 - Méthode et système pour ajuster automatiquement la position d'arrêt d'une cabine d'ascenseur - Google Patents

Méthode et système pour ajuster automatiquement la position d'arrêt d'une cabine d'ascenseur Download PDF

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Publication number
EP0757966A1
EP0757966A1 EP96305644A EP96305644A EP0757966A1 EP 0757966 A1 EP0757966 A1 EP 0757966A1 EP 96305644 A EP96305644 A EP 96305644A EP 96305644 A EP96305644 A EP 96305644A EP 0757966 A1 EP0757966 A1 EP 0757966A1
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EP
European Patent Office
Prior art keywords
stopping
car
displacement
delay
speed
Prior art date
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Granted
Application number
EP96305644A
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German (de)
English (en)
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EP0757966B1 (fr
Inventor
Christophe Durand
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.)
Otis Elevator Co
Original Assignee
Otis Elevator Co
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Publication date
Application filed by Otis Elevator Co filed Critical Otis Elevator Co
Publication of EP0757966A1 publication Critical patent/EP0757966A1/fr
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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
    • B66B1/36—Means for stopping the cars, cages, or skips at predetermined levels
    • B66B1/44—Means for stopping the cars, cages, or skips at predetermined levels and for taking account of disturbance factors, e.g. variation of load weight

Definitions

  • the present invention concerns a system for automatically adjusting the stopping position opposite the hall doors.
  • the information which defines the stopping height at the level of the hall door is obtained from the coinciding of magnetic sensors mounted on the elevator car and magnets fixed in the hoistway at each landing.
  • Such an assembly is known in the field as a position reference system (SPR).
  • SPR position reference system
  • the information gathered by the magnetic sensors is transmitted to the control logic with which the elevator installation is provided, which, in turn, provides stopping commands to the elevator car drive means.
  • FIG. 1 Such a PRS is shown in the attached Figure 1.
  • This Figure shows an elevator car 10 mounted in a hoistway 12 located at the level of a hall door 16.
  • the hoistway is provided with a magnet 18, while the car has two magnetic sensors 20, 22 fixed at two different levels on a vertical strut 24.
  • the upper sensor 20 provides level information during descent and the lower sensor 22 provides level information on ascending.
  • the SPR may be used in hydraulic elevators and also in electric elevators of the type comprising a two speed reduction motor having two separate rotors, one for moving the car at high speed and the other for moving at low speed before stopping.
  • the SPR should allow the car to stop at all landings opposite the hall doors such that the gap between the threshold of the car and that of the landing is as small as possible, preferably zero.
  • the magnetic sensors and the magnet are positioned with the theoretical assembly dimensions. These are calculated as a function of the nominal speed of movement of the car, the response time of the control logic, the parameters of detection of the magnets by the magnetic sensors and the theoretical regulation of the brake of the reduction motor.
  • the magnetic sensors provide the stopping information to the control logic which transmits the signals as stopping commands, leading to the motor power supply being cut off and the release of the brake shoes for electric elevators or the closing of the gates for hydraulic elevators. For this reason, if no precaution is taken, the precision of stopping obtained with such an SPR is poor.
  • the threshold of the elevator is out of line with the landing by several centimetres.
  • the solution which is currently used to resolve this problem consists in replacing the SPR by an apparatus capable of providing information on the actual height of the car continuously.
  • the present invention seeks to remedy these disadvantages by proposing an elevator car stopping position adjusting system which no longer requires manual adjustment of the magnet.
  • Another object of the invention is to provide a adjusting system of this type which allows a precise stopping position to be obtained.
  • a system for automatically adjusting the stopping position of an elevator car comprising:
  • the invention also concerns a method of adjusting the stopping position of an elevator car, characterised in that it comprises:
  • Another advantage of the invention lies in the fact that the sensors and the magnets can be positioned in a very approximate manner then errors can be corrected easily.
  • the supports of the sensors and the magnets can moreover be simplified by eliminating their adjustment possibility.
  • the saving in time thus realised is 5 more minutes per level.
  • the adjusting apparatus according to the invention can be realised at low cost, integrating the microprocessor in the control logic with which all elevator installations are normally provided and using, as an apparatus for measuring speed, the optical fork speed detector which is the subject of French Patent Application No. 95 08428, filed in the name of the present applicants.
  • FIG. 1 having already been described, we all pass directly to the description of Figure 2.
  • This Figure again shows the elevator car 10, the magnet 18 fixed thereon and the magnetic sensors 20, 22 fixed on the elevator car.
  • the control logic 26 comprises an input 28 which receives from the magnetic sensors 20, 22, information about their meeting with the magnets 18 and an output 30 at which a stopping command is provided and sent to the elevator drive means.
  • the elevator is also equipped with an apparatus for measuring the speed of displacement of car, for example an optical fork apparatus which is well known in the field.
  • an optical fork apparatus which is well known in the field.
  • such a system comprises an optical fork 32 comprising two crossed arms housing respectively an infra-red emitter and an infra-red receiver, the fork being fixed to the elevator car 10 such that the arms are in a horizontal plane and the infra-red beam 34 horizontally traverses the space between the arms.
  • the speed measuring apparatus also comprises a number of flags 36, 38 comprising plates which are opaque to infra-red radiation, the flags being fixed vertically in the hoistway at heights where it is desired to measure the speed of displacement of the car, being disposed in a manner such that they cut the infra-red beam 34 each time the optical fork passes their level.
  • flags 36, 38 comprising plates which are opaque to infra-red radiation, the flags being fixed vertically in the hoistway at heights where it is desired to measure the speed of displacement of the car, being disposed in a manner such that they cut the infra-red beam 34 each time the optical fork passes their level.
  • the upper flag 36 serves to measure the speed during descent, while the lower flag 38 serves to measure the speed during ascent.
  • the infra-red receiver emits signals having a first logic state when the infra-red beam passes and a second logic state when the beam is cut.
  • the signals are transmitted by a conductor 40 to a calculation unit 42 which, preferably, can be integrated in the control logic 26.
  • the adjustment system comprises a microprocessor 44 which stores in memory, all of the values of the stopping precision at the different levels where stopping is effected, in the two directions of displacement, and with an equilibrium load on board the elevator (about 45% of the nominal load). These values have been previously measured during installation.
  • the delay T is added to that which separates the stopping information and the stopping command, such that the stopping command is delayed and the final height of stopping is adjusted.
  • the elevator has a tendency to want to stop after the landing, one cannot anticipate the stop as it is not possible to add a negative delay. To remedy this, it is sufficient to position the sensors and the magnet in a manner such that the stopping information will always be given well before the stopping command such that one may always integrate a minimum delay.
  • the system according to the invention does not allow the variation in the stopping position to be corrected as a function of the load.
  • the correction of the stopping position which is obtained is only valid for the same load condition in which the values stored in the microprocessor were measured.
  • the system will correct the stopping height as if the load was nominal and it will then be necessary to carry out an adjustment of the stopping position as a function of the load in the car. This adjustment will be made as for the manual adjustment of the magnets.
  • control logic 26 The set of operations carried out by the control logic 26 is summarised by the flow diagram of Figure 3.
  • the magnetic sensors detect if the elevator car has arrived at a stopping level and if the speed has become equal to the minimum speed before stopping. If this is not the case, the program is not initialised. If YES, at stage 52, the calculating unit 42 calculates the period ⁇ t and the actual speed of the displacement of the car.
  • the system can, at that stage 54, look up the correction stopping precision value for the landing and the direction of displacement under consideration from the data stored in the microprocessor 54.
  • This result is stored in memory and its value is input into a delay module 48 placed between the stopping information given by the sensors 20, 22 and the stopping command.
  • stage 56 the system checks if the detection of the stopping information has taken place. If this is the case, the delay module is initiated in stage 58.
  • the system checks if the delay is completed. If YES, the stopping information is transferred to the stopping management program at stage 62.
  • the applicant has tested the system according to the present invention and, in order to do that, the magnets were placed to give the stopping heights well before the assumed landings (about 100 mm minimum) and at different values for each level.
  • the correction carried out by the system restored the stopping precision to a value less than 2 mm.
  • a variation of the stopping precision identical to the measured value before installation of the system was recorded, i.e. the system has no influence on the stopping precision in the case of a loaded car.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Elevator Control (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
EP96305644A 1995-08-07 1996-07-31 Méthode et système pour ajuster automatiquement la position d'arrêt d'une cabine d'ascenseur Expired - Lifetime EP0757966B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9509571A FR2737712B1 (fr) 1995-08-07 1995-08-07 Procede et systeme de reglage automatique de la position d'arret d'une cabine d'ascenseur
FR9509571 1995-08-07

Publications (2)

Publication Number Publication Date
EP0757966A1 true EP0757966A1 (fr) 1997-02-12
EP0757966B1 EP0757966B1 (fr) 2001-07-11

Family

ID=9481758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96305644A Expired - Lifetime EP0757966B1 (fr) 1995-08-07 1996-07-31 Méthode et système pour ajuster automatiquement la position d'arrêt d'une cabine d'ascenseur

Country Status (6)

Country Link
EP (1) EP0757966B1 (fr)
DE (1) DE69613773T2 (fr)
ES (1) ES2159689T3 (fr)
FR (1) FR2737712B1 (fr)
HU (1) HUP9602120A3 (fr)
PL (1) PL315511A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001070613A1 (fr) * 2000-03-16 2001-09-27 Otis Elevator Company Systeme de mise a niveau pour ascenseur
WO2005123478A1 (fr) 2004-06-15 2005-12-29 Iii-Solutions Gmbh Dispositif de positionnement fin de moyens de transport a traction par cable
WO2007039750A2 (fr) * 2005-10-05 2007-04-12 Dewhurst Plc Systeme de detection
CN106976769A (zh) * 2017-05-26 2017-07-25 湖北江汉建筑工程机械有限公司 一种施工升降机自动平层方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4256203A (en) * 1978-12-18 1981-03-17 Otis Elevator Company Self-adjusting elevator leveling apparatus and method
GB2061559A (en) * 1979-10-18 1981-05-13 Elevator Gmbh Procedure for stopping a means moving along a controlled path such as a lift car
EP0382933A2 (fr) * 1989-02-16 1990-08-22 Inventio Ag Méthode pour modifier l'atterissage d'une cabine d'ascenseur hydraulique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4256203A (en) * 1978-12-18 1981-03-17 Otis Elevator Company Self-adjusting elevator leveling apparatus and method
GB2061559A (en) * 1979-10-18 1981-05-13 Elevator Gmbh Procedure for stopping a means moving along a controlled path such as a lift car
EP0382933A2 (fr) * 1989-02-16 1990-08-22 Inventio Ag Méthode pour modifier l'atterissage d'une cabine d'ascenseur hydraulique

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001070613A1 (fr) * 2000-03-16 2001-09-27 Otis Elevator Company Systeme de mise a niveau pour ascenseur
US6526368B1 (en) 2000-03-16 2003-02-25 Otis Elevator Company Elevator car position sensing system
US6701277B2 (en) 2000-03-16 2004-03-02 Otis Elevator Company Elevator car position sensing system
DE10195922B4 (de) * 2000-03-16 2020-10-22 Otis Elevator Co. Nivellierungssystem für Aufzüge
WO2005123478A1 (fr) 2004-06-15 2005-12-29 Iii-Solutions Gmbh Dispositif de positionnement fin de moyens de transport a traction par cable
WO2007039750A2 (fr) * 2005-10-05 2007-04-12 Dewhurst Plc Systeme de detection
WO2007039750A3 (fr) * 2005-10-05 2007-08-23 Dewhurst Plc Systeme de detection
CN106976769A (zh) * 2017-05-26 2017-07-25 湖北江汉建筑工程机械有限公司 一种施工升降机自动平层方法
CN106976769B (zh) * 2017-05-26 2018-12-04 湖北江汉建筑工程机械有限公司 一种施工升降机自动平层方法

Also Published As

Publication number Publication date
FR2737712B1 (fr) 1997-10-24
ES2159689T3 (es) 2001-10-16
PL315511A1 (en) 1997-02-17
HUP9602120A2 (en) 1997-07-28
DE69613773D1 (de) 2001-08-16
DE69613773T2 (de) 2001-10-25
FR2737712A1 (fr) 1997-02-14
HU9602120D0 (en) 1996-09-30
HUP9602120A3 (en) 1999-04-28
EP0757966B1 (fr) 2001-07-11

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