EP0755894A1 - Method and apparatus for measuring the load in an elevator car - Google Patents

Method and apparatus for measuring the load in an elevator car Download PDF

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Publication number
EP0755894A1
EP0755894A1 EP96111277A EP96111277A EP0755894A1 EP 0755894 A1 EP0755894 A1 EP 0755894A1 EP 96111277 A EP96111277 A EP 96111277A EP 96111277 A EP96111277 A EP 96111277A EP 0755894 A1 EP0755894 A1 EP 0755894A1
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EP
European Patent Office
Prior art keywords
load
load variable
elevator car
elevator
motor
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EP96111277A
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German (de)
French (fr)
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EP0755894B1 (en
Inventor
Jürgen Dr. Dipl.-Ing. Mueller
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Inventio AG
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Inventio AG
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    • 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
    • B66B1/3484—Load weighing or car passenger counting devices using load cells

Definitions

  • the invention relates to a method and a device for measuring the load in an elevator car, which is supported by means of spring elements on a support frame which can be moved in an elevator shaft by means of a support cable guided over a traction sheave, wherein a motor controlled by a motor control drives the traction sheave and Executes travel commands of an elevator control.
  • a disadvantage of the known device is the complex construction and assembly of the angle with the strain gauges on the base support of the support frame.
  • considerable adjustment work for the bridge circuit and the amplifier is necessary. Accordingly, such systems are also expensive to manufacture and maintain.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, achieves the object of avoiding the disadvantages of the known device and of creating a device which precisely measures the load in an elevator car using measuring devices which are already present in an elevator system.
  • the advantage achieved by the invention is essentially to be seen in the fact that the cabin floor and support frame can be simplified, which in turn makes it possible to measure the load even in low-cost elevator systems for reasons of cost.
  • 1 to 4 denotes an elevator shaft with stops 2, in which an elevator car 3 can be moved.
  • a motor 4 drives a traction sheave 5, over which a supporting cable 6 is guided.
  • a support frame 7 is arranged at one end of the support cable 6 and a counterweight 8 is arranged at the other end of the support cable 6.
  • the elevator car 3 rests on spring elements 9 which are supported on the support frame 7.
  • One over a first deflection roller 10 and a second deflection roller 11-guided belt 12 is mechanically coupled to the elevator car 3.
  • the movement of the elevator car 3 is transmitted to the belt 12, which drives a pulse generator 13 coupled to the first deflection roller 10.
  • Each vertical movement of the elevator car 3 is thus converted into electrical pulses by the pulse generator 13.
  • the motor 4 can be arranged on the support frame 7, for example in the case of linear motor drives or rope-less friction wheel drives.
  • the pulse generator 13 can also be arranged on the elevator car 3. In this variant, belt 12 and deflection rollers 10, 11 can be omitted. The pulse generator 13 is then driven by means of a friction wheel which rolls, for example, on a guide rail.
  • An elevator control system 14 generates floor calls FL and car calls CA from passengers 16 in the elevator car 3 based on floor calls FL and car calls CA input at sensors 15 of the stops 2 Travel commands DO, which are forwarded to an engine control 17.
  • the motor controller 17, for example a converter determines the driving curve of the elevator car 3 based on the travel commands and on the basis of a path signal SL of the pulse generator 13, which corresponds to the current position of the elevator car 3 in the elevator shaft 1 the delay of the elevator car 3 determined.
  • a motor current IW is measured and, like the displacement signal SL, fed to an evaluation unit 18 for determining load quantities.
  • the path signal SL is fed to a first converter 19 of the evaluation unit 18 and is there when the elevator car 3 stops at the stop 2, for example by means of a table or a mathematical formula, in one of the movements of the elevator car 3 compared to the elevator shaft 1 corresponding first load size m SL converted.
  • the motor current IW is fed to a second converter 20 of the evaluation unit 18 and is converted there at the set speed of the elevator car 3, for example by means of a table or a mathematical formula, into a second load variable m IW corresponding to the car load. This size serves as a new load reference.
  • the second load size m IW and the first load size m SL corresponding to the new load in the elevator car 3 are added by means of an adder 21 to a third load size m IW - m SL , which is the correct sign influenced by the motor control 17 controlled motor current IW.
  • the third load variable m IW -m SL can be evaluated by the elevator control 14 and Depending on the load in the elevator car 3, the car allocation, for example, when the elevator car 3 is full, no further car calls are accepted.
  • FIG. 4 shows a flowchart of the evaluation unit 18 implemented, for example, in software.
  • a first step S1 it is checked whether the elevator car 3 is at a stop 2 and the doors are still closed. If the result of the test carried out in step S1 is yes, the path signal SL is read in in a second step S2 and stored as a reference signal. After it has been determined in a third step S3 that the doors of the elevator car 3 have been opened and the door closing command has been given, the travel signal SL is evaluated in a fourth step S4 and, with the difference to the reference signal of the second step S2, the first load variable m SL formed and saved. In a fifth step S5 it is checked whether the doors have been closed again.
  • the third load variable m IW -m SL is determined in the sixth step S6, the second load variable m IW during the preceding journey and the first load variable m SL being formed in the fourth step S4.
  • the third load variable m IW -m SL is also communicated to the elevator control 3 and the motor control 17.
  • the speed of the elevator car 3 is checked until the elevator car 3 has reached its target speed.
  • the second load variable m IW is formed and stored on the basis of the instantaneous motor current IW.
  • the elevator car 3 then travels with the second load variable m IW influencing the motor current IW controlled by the motor controller 17 until the next stop at a stop 2.
  • the motor current can be influenced using only the first load variable m SL . If the elevator car 3 is empty, a reference signal is generated in this case. At each stop, each load change is added to the load size m SL of the previous trip with the correct sign.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Elevator Control (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The load measuring system detects the compression of the springs (9) supporting the lift cabin (3) relative to a surrounding carrier frame (7) for detecting variations in the load within the lift cabin. The movement of the lift cabin relative to the carrier frame and the lift shaft is detected via an endless band (12) displaced in conjunction with the lift cabin and a cooperating pulse generator (13). This provides a signal (SL) which is evaluated for controlling the current for the lift drive motor (4).

Description

Die Erfindung betrifft ein Verfahren und eine Einrichtung zur Messung der Last in einer Aufzugskabine, die mittels Federelementen an einem Tragrahmen abgestützt ist, der mittels eines über eine Treibscheibe geführten Tragseiles in einem Aufzugsschacht verfahrbar ist, wobei ein von einer Motorsteuerung gesteuerter Motor die Treibscheibe antreibt und Fahrbefehle einer Aufzugssteuerung ausführt.The invention relates to a method and a device for measuring the load in an elevator car, which is supported by means of spring elements on a support frame which can be moved in an elevator shaft by means of a support cable guided over a traction sheave, wherein a motor controlled by a motor control drives the traction sheave and Executes travel commands of an elevator control.

Aus der Patentschrift CH 663 949 ist eine Aufzugskabine mit einer Lastmesseinrichtung bekannt geworden. Der Kabinenboden der Aufzugskabine stützt sich über Federelemente auf horizontal verlaufenden Schenkeln von Winkeln ab, deren vertikal verlaufende Schenkel mit einem Bodenträger eines Tragrahmens verschraubt sind. An der oberen und unteren Seite des horizontal verlaufenden Schenkels eines jeden Winkels ist je ein Dehnungsmessstreifen befestigt. Es sind vier Winkel vorgesehen, die an den vier Ecken des Bodenträgers angeordnet sind. Die Dehnungsmessstreifen der vier Winkel sind zu einer Brückenschaltung zusammengeschaltet, die mit einem Verstärker verbunden ist. Der Verstärker ist türseitig unter der Aufzugskabine am Bodenträger befestigt.From the patent specification CH 663 949 an elevator car with a load measuring device has become known. The car floor of the elevator car is supported by spring elements on horizontally running legs from angles, the vertically running legs of which are screwed to a floor support of a supporting frame. A strain gauge is attached to the upper and lower side of the horizontal leg of each angle. Four angles are provided, which are arranged at the four corners of the floor support. The strain gauges of the four angles are connected to a bridge circuit, which is connected to an amplifier. The amplifier is attached to the floor support on the door side under the elevator car.

Nachteilig bei der bekannten Einrichtung ist die aufwendige Konstruktion und Montage der Winkel mit den Dehnungsmessstreifen am Bodenträger des Tragrahmens. Zudem sind erhebliche Einstellarbeiten für die Brückenschaltung und den Verstärker notwendig. Solche Systeme sind dementsprechend auch teuer in der Herstellung und im Unterhalt.A disadvantage of the known device is the complex construction and assembly of the angle with the strain gauges on the base support of the support frame. In addition, considerable adjustment work for the bridge circuit and the amplifier is necessary. Accordingly, such systems are also expensive to manufacture and maintain.

Hier will die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, löst die Aufgabe, die Nachteile der bekannten Einrichtung zu vermeiden und eine Einrichtung zu schaffen, die mit ohnehin in einem Aufzugssystem vorhandenen Messmitteln die Last in einer Aufzugskabine präzise erfasst.The invention seeks to remedy this. The invention, as characterized in the claims, achieves the object of avoiding the disadvantages of the known device and of creating a device which precisely measures the load in an elevator car using measuring devices which are already present in an elevator system.

Der durch die Erfindung erreichte Vorteil ist im wesentlichen darin zu sehen, dass Kabinenboden und Tragrahmen vereinfacht werden können, was wiederum eine Lastmessung auch bei Billig-Aufzugssystemen aus Kostengründen möglich macht.The advantage achieved by the invention is essentially to be seen in the fact that the cabin floor and support frame can be simplified, which in turn makes it possible to measure the load even in low-cost elevator systems for reasons of cost.

Im folgenden wird die Erfindung anhand von lediglich einen Ausführungsweg darstellenden Zeichnungen näher erläutert.
Es zeigen:

Fig. 1
einen Aufzugsschacht mit einer Aufzugskabine und einem Weggeber,
Fig. 2
ein Aufzugssystem mit der erfindungsgemässen Einrichtung zur Messung der Last in der Aufzugskabine,
Fig. 3
ein Blockschaltbild einer Auswerteeinheit und
Fig. 4
ein Flussdiagramm nach dem die Auswerteeinheit arbeitet.
The invention is explained in more detail below with the aid of drawings which illustrate only one embodiment.
Show it:
Fig. 1
an elevator shaft with an elevator car and a travel sensor,
Fig. 2
an elevator system with the device according to the invention for measuring the load in the elevator car,
Fig. 3
a block diagram of an evaluation unit and
Fig. 4
a flowchart according to which the evaluation unit works.

In den Fig. 1 bis 4 ist mit 1 ein Aufzugsschacht mit Haltestellen 2 bezeichnet, in dem eine Aufzugskabine 3 verfahrbar ist. Ein Motor 4 treibt eine Treibscheibe 5 an, über die ein Tragseil 6 geführt ist. Am einen Ende des Tragseiles 6 ist ein Tragrahmen 7 und am anderen Ende des Tragseiles 6 ist ein Gegengewicht 8 angeordnet. Die Aufzugskabine 3 ruht auf Federelementen 9, die sich am Tragrahmen 7 abstützen. Ein über eine erste Umlenkrolle 10 und eine zweite Umlenkrolle 11 geführtes Band 12 ist mechanisch mit der Aufzugskabine 3 gekoppelt. Die Bewegung der Aufzugskabine 3 wird auf das Band 12 übertragen, das einen an die erste Umlenkrolle 10 angekoppelten Impulsgenerator 13 antreibt. Jede vertikale Bewegung der Aufzugskabine 3 wird somit vom Impulsgenerator 13 in elektrische Impulse umgewandelt. Vertikale Bewegungen gegenüber dem Aufzugsschacht 1 werden durch den Motor 4 beim Verfahren der Aufzugskabine 3 von Haltestelle 2 zu Haltestelle 2, durch Dehnung des Tragseiles 6 und durch Laständerungen in der Aufzugskabine 3 verursacht. Bei Laständerungen werden die Federelemente 9 entsprechend ihrer Charakteristik mehr oder weniger zusammengepresst, wodurch sich die Aufzugskabine 3 gegenüber dem Tragrahmen 7 und gegenüber dem Aufzugsschacht 1 bewegt, was wiederum vom Impulsgenerator 13 erfasst wird und in Impulse umgesetzt wird. Impulsgenerator 13, Band 12 und Umlenkrollen 10,11 sind Bestandteil eines üblicherweise in den Aufzugssystemen eingebauten Weggebers, der die genaue Lage der Aufzugskabine 3 im Aufzugsschacht 1 detektiert. Der Impulsgenerator 13 kann auch von einem nicht dargestellten Geschwindigkeitsbegrenzer angetrieben werden.1 to 4, 1 denotes an elevator shaft with stops 2, in which an elevator car 3 can be moved. A motor 4 drives a traction sheave 5, over which a supporting cable 6 is guided. A support frame 7 is arranged at one end of the support cable 6 and a counterweight 8 is arranged at the other end of the support cable 6. The elevator car 3 rests on spring elements 9 which are supported on the support frame 7. One over a first deflection roller 10 and a second deflection roller 11-guided belt 12 is mechanically coupled to the elevator car 3. The movement of the elevator car 3 is transmitted to the belt 12, which drives a pulse generator 13 coupled to the first deflection roller 10. Each vertical movement of the elevator car 3 is thus converted into electrical pulses by the pulse generator 13. Vertical movements relative to the elevator shaft 1 are caused by the motor 4 when moving the elevator car 3 from stop 2 to stop 2, by stretching the suspension cable 6 and by changes in load in the elevator car 3. In the event of changes in load, the spring elements 9 are more or less compressed according to their characteristics, as a result of which the elevator car 3 moves relative to the support frame 7 and relative to the elevator shaft 1, which in turn is detected by the pulse generator 13 and converted into pulses. Pulse generator 13, band 12 and deflecting rollers 10, 11 are part of a displacement sensor which is usually built into the elevator systems and which detects the exact position of the elevator car 3 in the elevator shaft 1. The pulse generator 13 can also be driven by a speed limiter, not shown.

In einer weiteren Ausführungsvariante kann der Motor 4 am Tragrahmen 7, beispielsweise bei Linearmotorantrieben oder seillosen Reibradantrieben, angeordnet sein. Der Impulsgeber 13 kann auch an der Aufzugskabine 3 angeordnet sein. Bei dieser Variante kann Band 12 und Umlenkrollen 10,11 entfallen. Der Impulsgeber 13 wird dann mittels eines Reibrades angetrieben, das beispielsweise auf einer Führungsschiene abrollt.In a further embodiment variant, the motor 4 can be arranged on the support frame 7, for example in the case of linear motor drives or rope-less friction wheel drives. The pulse generator 13 can also be arranged on the elevator car 3. In this variant, belt 12 and deflection rollers 10, 11 can be omitted. The pulse generator 13 is then driven by means of a friction wheel which rolls, for example, on a guide rail.

Fig. 2 zeigt ein Aufzugssystem mit der erfindungsgemässen Einrichtung zur Messung der Last in der Aufzugskabine. Eine Aufzugssteuerung 14 erzeugt aufgrund von an Gebern 15 der Haltestellen 2 eingegebenen Stockwerkrufen FL und Kabinenrufen CA von Fahrgästen 16 in der Aufzugskabine 3 Fahrbefehle DO, die an eine Motorsteuerung 17 weitergeleitet werden. Die Motorsteuerung 17, beispielsweise ein Umrichter bestimmt aufgrund der Fahrbefehle und aufgrund eines Wegsignales SL des Impulsgenerators 13, das der momentanen Lage der Aufzugskabine 3 im Aufzugsschacht 1 entspricht, die Fahrkurve der Aufzugskabine 3. Mit der Fahrkurve ist der Sollwert der Beschleunigung, der Nenngeschwindigkeit und der Verzögerung der Aufzugskabine 3 bestimmt. Im weiteren wird ein Motorstrom IW gemessen und wie auch das Wegsignal SL einer Auswerteeinheit 18 zur Bestimmung von Lastgrössen zugeführt.2 shows an elevator system with the device according to the invention for measuring the load in the elevator car. An elevator control system 14 generates floor calls FL and car calls CA from passengers 16 in the elevator car 3 based on floor calls FL and car calls CA input at sensors 15 of the stops 2 Travel commands DO, which are forwarded to an engine control 17. The motor controller 17, for example a converter, determines the driving curve of the elevator car 3 based on the travel commands and on the basis of a path signal SL of the pulse generator 13, which corresponds to the current position of the elevator car 3 in the elevator shaft 1 the delay of the elevator car 3 determined. In addition, a motor current IW is measured and, like the displacement signal SL, fed to an evaluation unit 18 for determining load quantities.

Fig. 3 zeigt prinzipiell die Funktionsweise der Auswerteeinheit 18. Das Wegsignal SL wird einem ersten Wandler 19 der Auswerteeinheit 18 zugeführt und wird dort bei einem Halt der Aufzugskabine 3 auf der Haltestelle 2 beispielsweise mittels einer Tabelle oder einer mathematischen Formel in eine der Bewegung der Aufzugskabine 3 gegenüber dem Aufzugsschacht 1 entsprechende erste Lastgrösse mSL umgewandelt. Der Motorstrom IW wird einem zweiten Wandler 20 der Auswerteeinheit 18 zugeführt und wird dort bei Sollgeschwindigkeit der Aufzugskabine 3 beispielsweise mittels einer Tabelle oder einer mathematischen Formel in eine der Kabinenlast entsprechende zweite Lastgrösse mIW umgewandelt. Diese Grösse dient als neue Lastreferenz. Beim Halt der Aufzugskabine 3 und anschliessendem Entladen bzw. neuem Beladen werden die zweite Lastgrösse mIW und die der neuen Last in der Aufzugskabine 3 entsprechende erste Lastgrösse mSL mittels eines Addierers 21 vorzeichenrichtig zu einer dritten Lastgrösse mIW - mSL addiert, die den mittels der Motorsteuerung 17 gesteuerten Motorstrom IW beeinflusst. Gleichzeitig kann die dritte Lastgrösse mIW -mSL von der Aufzugssteuerung 14 ausgewertet werden und abhängig von der Last in der Aufzugskabine 3 die Kabinenzuteilung, beispielsweise werden bei voller Aufzugskabine 3 keine weiteren Kabinenrufe mehr akzeptiert, vorgenommen werden.3 shows the principle of operation of the evaluation unit 18. The path signal SL is fed to a first converter 19 of the evaluation unit 18 and is there when the elevator car 3 stops at the stop 2, for example by means of a table or a mathematical formula, in one of the movements of the elevator car 3 compared to the elevator shaft 1 corresponding first load size m SL converted. The motor current IW is fed to a second converter 20 of the evaluation unit 18 and is converted there at the set speed of the elevator car 3, for example by means of a table or a mathematical formula, into a second load variable m IW corresponding to the car load. This size serves as a new load reference. When the elevator car 3 is stopped and then unloaded or reloaded, the second load size m IW and the first load size m SL corresponding to the new load in the elevator car 3 are added by means of an adder 21 to a third load size m IW - m SL , which is the correct sign influenced by the motor control 17 controlled motor current IW. At the same time, the third load variable m IW -m SL can be evaluated by the elevator control 14 and Depending on the load in the elevator car 3, the car allocation, for example, when the elevator car 3 is full, no further car calls are accepted.

Fig. 4 zeigt ein Flussdiagramm der beispielsweise softwaremässig realisierten Auswerteeinheit 18. In einem ersten Schritt S1 wird geprüft, ob die Aufzugskabine 3 auf einer Haltestelle 2 steht und die Türen noch geschlossen sind. Bei einem mit ja bezeichneten positiven Ergebnis der im Schritt S1 durchgeführten Prüfung wird in einem zweiten Schritt S2 das Wegsignal SL eingelesen und als Referenzsignal gespeichert. Nachdem in einem dritten Schritt S3 festgestellt worden ist, dass die Türen der Aufzugskabine 3 geöffnet worden sind und der Türschliessbefehl erfolgt ist, wird in einem vierten Schritt S4 das Wegsignal SL ausgewertet und mit der Differenz zum Referenzsignal des zweiten Schrittes S2 die erste Lastgrösse mSL gebildet und gespeichert. In einem fünften Schritt S5 wird geprüft, ob die Türen wieder geschlossen worden sind. Bei geschlossenen Türen wird im sechsten Schritt S6 die dritte Lastgrösse mIW - mSL bestimmt, wobei die zweite Lastgrösse mIW während der vorangehenden Fahrt und die erste Lastgrösse mSL im vierten Schritt S4 gebildet worden sind. Die dritte Lastgrösse mIW - mSL wird auch der Aufzugsteuerung 3 und der Motorsteuerung 17 mitgeteilt. Im siebten Schritt S7 wird nach dem vorangehenden Halt auf der Haltestelle 2 solange die Geschwindigkeit der Aufzugskabine 3 überprüft, bis die Aufzugskabine 3 ihre Sollgeschwindigkeit erreicht hat. Dann wird in einem achten Schritt S8 aufgrund des momentanen Motorstromes IW die zweite Lastgrösse mIW gebildet und gespeichert. Die im sechsten Schritt S6 der Aufzugssteuerung 14 und der Motorsteuerung 17 mitgeteilte und gespeicherte dritte Lastgrösse mIW - mSL wird nun mit der zweiten Lastgrösse mIW überschrieben. Die Aufzugskabine 3 fährt dann mit der zweiten den mittels der Motorsteuerung 17 gesteuerten Motorstrom IW beeinflussenden Lastgrösse mIW bis zum nächsten Halt auf einer Haltestelle 2.FIG. 4 shows a flowchart of the evaluation unit 18 implemented, for example, in software. In a first step S1, it is checked whether the elevator car 3 is at a stop 2 and the doors are still closed. If the result of the test carried out in step S1 is yes, the path signal SL is read in in a second step S2 and stored as a reference signal. After it has been determined in a third step S3 that the doors of the elevator car 3 have been opened and the door closing command has been given, the travel signal SL is evaluated in a fourth step S4 and, with the difference to the reference signal of the second step S2, the first load variable m SL formed and saved. In a fifth step S5 it is checked whether the doors have been closed again. When the doors are closed, the third load variable m IW -m SL is determined in the sixth step S6, the second load variable m IW during the preceding journey and the first load variable m SL being formed in the fourth step S4. The third load variable m IW -m SL is also communicated to the elevator control 3 and the motor control 17. In the seventh step S7, after the previous stop at the stop 2, the speed of the elevator car 3 is checked until the elevator car 3 has reached its target speed. Then, in an eighth step S8, the second load variable m IW is formed and stored on the basis of the instantaneous motor current IW. The third load variable m IW -m SL communicated and stored in the sixth step S6 to the elevator control 14 and the motor control 17 is now included the second load size m IW overwritten. The elevator car 3 then travels with the second load variable m IW influencing the motor current IW controlled by the motor controller 17 until the next stop at a stop 2.

Bei Motorsteuerungen in denen der Motorstrom nicht ausgewertet wird, kann die Beeinflussung des Motorstromes anhand lediglich der ersten Lastgrösse mSL erfolgen. Bei leerer Aufzugskabine 3 wird in diesem Fall ein Referenzsignal erzeugt. Bei jedem Halt wird dann jeder Lastwechsel zur Lastgrösse mSL der vorhergehenden Fahrt vorzeichenrichtig summiert.In motor controls in which the motor current is not evaluated, the motor current can be influenced using only the first load variable m SL . If the elevator car 3 is empty, a reference signal is generated in this case. At each stop, each load change is added to the load size m SL of the previous trip with the correct sign.

Claims (6)

Verfahren zur Messung der Last in einer Aufzugskabine (3), die mittels Federelementen (9) an einem Tragrahmen (7) abgestützt ist, der insbesondere mittels eines über eine Treibscheibe (5) geführten Tragseiles (6) in einem Aufzugsschacht (1) verfahrbar ist, wobei ein von einer Motorsteuerung (17) gesteuerter Motor (4) die Treibscheibe (5) antreibt und Fahrbefehle einer Aufzugssteuerung (14) ausführt,
dadurch gekennzeichnet,
dass die durch aus- und zusteigende Fahrgäste (16) verursachte Bewegung der Aufzugskabine (3) gegenüber dem Tragrahmen (7) und dem Aufzugsschacht (1) mittels eines Weggebers (10, 11, 12, 13) in ein Wegsignal (SL) umgewandelt wird und
dass aus dem Wegsignal (SL) eine erste Lastgrösse (mSL) gebildet wird, wobei die erste Lastgrösse (mSL) einen mittels der Motorsteuerung (17) gesteuerten Motorstrom (IW) beeinflusst.Method for measuring the load in an elevator car (3), which is supported by means of spring elements (9) on a support frame (7), which can be moved in an elevator shaft (1) in particular by means of a support cable (6) guided over a traction sheave (5) A motor (4) controlled by a motor control (17) drives the traction sheave (5) and executes travel commands from an elevator control (14).
characterized,
that the movement of the elevator car (3) relative to the supporting frame (7) and the elevator shaft (1) caused by passengers (16) getting on and off is converted into a path signal (SL) by means of a displacement sensor (10, 11, 12, 13) and
that a first load variable (m SL ) is formed from the travel signal (SL), the first load variable (m SL ) influencing a motor current (IW) controlled by the motor controller (17). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass bei einem Halt der Aufzugskabine (3) auf einer Haltestelle (2) das Wegsignal (SL) vor und nach dem Aus- und Zusteigen der Fahrgäste (16) erfasst wird und dass daraus die erste Lastgrösse (mSL) gebildet wird.Method according to claim 1,
characterized,
that when the elevator car (3) stops at a stop (2), the path signal (SL) is recorded before and after the passengers (16) get on and off and that the first load variable (m SL ) is formed therefrom. Verfahren nach Anspruch 2,
dadurch gekennzeichnet,
dass aus dem Motorstrom (IW) eine zweite Lastgrösse (mIW) gebildet wird und
dass eine dritte Lastgrösse (mIW - mSL) aus der Summe der ersten Lastgrösse (mSL) und der zweiten Lastgrösse (mIW) gebildet wird, wobei die dritte Lastgrösse (mIW - mSL) den mittels der Motorsteuerung (17) gesteuerten Motorstrom (IW) beeinflusst.Method according to claim 2,
characterized,
that a second load variable (m IW ) is formed from the motor current (IW) and
that a third load variable (m IW - m SL ) is formed from the sum of the first load variable (m SL ) and the second load variable (m IW ), the third load variable (m IW - m SL ) being determined by means of the motor control (17) controlled motor current (IW) influences. Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
dass die dritte Lastgrösse (mIW - mSL) nach dem Schliessen der Kabinentüren gebildet wird, wobei die zweite Lastgrösse (mIW) aufgrund des Motorstromes (IW) bei Sollgeschwindigkeit der Aufzugskabine (13) bei der vorangehenden Fahrt gebildet wurde.Method according to claim 3,
characterized,
that the third load variable (m IW - m SL ) is formed after the car doors are closed, the second load variable (m IW ) being formed on the basis of the motor current (IW) at the set speed of the elevator car (13) during the previous journey. Einrichtung zur Durchführung des Verfahrens nach den vorangehenden Ansprüchen,
dadurch gekennzeichnet,
dass zur Messung der durch aus- und zusteigende Fahrgäste (16) verursachte Bewegung der Aufzugskabine (3) gegenüber dem Tragrahmen (7) und dem Aufzugsschacht (1) ein Weggeber (10, 11, 12, 13) vorgesehen ist, der ein der Bewegung entsprechendes Wegsignal (SL) erzeugt und
dass zur Bestimmung einer dem Wegsignal (SL) entsprechenden ersten Lastgrösse (mSL) eine Auswerteeinheit (18) mit einem ersten Wandler (19) vorgesehen ist, wobei die erste Lastgrösse (mSL) einen mittels der Motorsteuerung (17) gesteuerten Motorstrom (IW) beeinflusst.Device for carrying out the method according to the preceding claims,
characterized,
that a displacement sensor (10, 11, 12, 13) is provided for measuring the movement of the elevator car (3) caused by passengers getting on and off (16) relative to the supporting frame (7) and the elevator shaft (1), which provides a movement corresponding path signal (SL) generated and
that an evaluation unit (18) with a first transducer (19) is provided for determining a corresponding to the travel signal (SL) first load magnitude (m SL), wherein the first load magnitude (m SL) a controlled means of the motor control (17) the motor current (IW ) influenced. Einrichtung nach Anspruch 5,
dadurch gekennzeichnet,
dass die Auswerteeinheit (18) einen zweiten Wandler (20) zur Bestimmung einer dem Motorstrom (IW) entsprechenden zweiten Lastgrösse (mIW) aufweist und dass die Auswerteeinheit (18) einen Addierer (21) zur Bestimmung einer aus der Summe der ersten Lastgrösse (mSL) und der zweiten Lastgrösse (mIW) gebildeten dritten Lastgrösse (mIW - mSL) aufweist, wobei die dritte Lastgrösse (mIW - mSL) den mittels der Motorsteuerung (17) gesteuerten Motorstrom (IW) beeinflusst.Device according to claim 5,
characterized,
that the evaluation unit (18) comprises a second transducer (20) for determining an appropriate motor current (IW) second load magnitude (m IW) and that the evaluation unit (18) comprises an adder (21) for determining a the sum of the first load magnitude ( m SL ) and the second load variable (m IW ) formed third load variable (m IW - m SL ), the third load variable (m IW - m SL ) influencing the motor current (IW) controlled by the motor controller (17).
EP96111277A 1995-07-26 1996-07-12 Method and apparatus for measuring the load in an elevator car Expired - Lifetime EP0755894B1 (en)

Applications Claiming Priority (3)

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CH2187/95 1995-07-26
CH218795 1995-07-26
CH218795 1995-07-26

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EP0755894B1 EP0755894B1 (en) 2001-03-14

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EP (1) EP0755894B1 (en)
JP (1) JP3628814B2 (en)
AT (1) ATE199699T1 (en)
BR (1) BR9603180A (en)
CA (1) CA2181882C (en)
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EP0953537A3 (en) * 1998-04-28 2002-03-13 Kabushiki Kaisha Toshiba Load detector for elevator car
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EP1790607A2 (en) * 2005-11-29 2007-05-30 Maber costruzioni s.r.l. Safety device for automatically checking the weight of the load present on one or more lifting groups of an elevator, of a platform, of a lift or of other similar apparatuses
EP1790607A3 (en) * 2005-11-29 2008-11-26 Maber costruzioni s.r.l. Safety device for automatically checking the weight of the load present on one or more lifting groups of an elevator, of a platform, of a lift or of other similar apparatuses
DE102010019368A1 (en) * 2010-05-05 2011-11-10 Viktor Dulger Lift i.e. rope winch for transporting people and/or load in building, has load sensor determining load within movable cabin, and control unit controlling drive power of electric motor based on determined load within movable cabin
DE102014225551A1 (en) * 2014-12-11 2016-06-16 Thyssenkrupp Ag Method for determining a load in a car of an elevator system
EP3848314A1 (en) 2020-01-10 2021-07-14 Inventio AG System for measuring load in an elevator system and method for determining the load of an elevator car

Also Published As

Publication number Publication date
ATE199699T1 (en) 2001-03-15
US5852264A (en) 1998-12-22
BR9603180A (en) 2004-08-17
EP0755894B1 (en) 2001-03-14
CA2181882A1 (en) 1997-01-27
JPH0943039A (en) 1997-02-14
JP3628814B2 (en) 2005-03-16
DE59606572D1 (en) 2001-04-19
CA2181882C (en) 2007-01-09

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