EP1108809A1 - Device and method for measuring the load in a washing machine - Google Patents

Device and method for measuring the load in a washing machine Download PDF

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Publication number
EP1108809A1
EP1108809A1 EP00124851A EP00124851A EP1108809A1 EP 1108809 A1 EP1108809 A1 EP 1108809A1 EP 00124851 A EP00124851 A EP 00124851A EP 00124851 A EP00124851 A EP 00124851A EP 1108809 A1 EP1108809 A1 EP 1108809A1
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EP
European Patent Office
Prior art keywords
laundry
electrode
tub
jacket wall
measuring
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Granted
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EP00124851A
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German (de)
French (fr)
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EP1108809B1 (en
Inventor
Uwe Böduel
Walter Sams
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication of EP1108809A1 publication Critical patent/EP1108809A1/en
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/26—Unbalance; Noise level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D06F2105/60—Audible signals

Definitions

  • the invention relates to a device for measuring the load in a laundry treatment device, in which a laundry drum is rotatably mounted. Likewise relates the invention relates to a method for measuring the load.
  • DE 37 36 809 A1 discloses a laundry treatment device, i. H. a household washing machine or spin dryer, known, for measuring the drum load Measuring equipment is available.
  • the measurement is based on the fact that a torque required to accelerate a drum loaded with laundry is measured directly. This should cause disturbances such as V-belt losses to be excluded.
  • the known method therefore presupposes that the laundry treatment device already is put into operation in order to be able to measure the laundry weight.
  • the loading of a household washing machine is thereby measured that the tub is suspended on suspension springs, their travel depends on the spring load, so that the springs according to the weight of the tub be deflected. Since only the total weight of the tub, laundry drum and laundry load is measured is the relative change in spring deflection by loading and unloading the laundry relatively low.
  • this object is achieved in a device of the type mentioned solved in that a first, formed by a wall of the laundry drum or arranged on the wall of the laundry drum, at a first electrical potential lying electrode and a second, fixed at a second electrical potential lying electrode are arranged at a short distance from each other the distance between the electrodes can be changed by loading or unloading, and that a capacitance corresponding to a distance between the electrodes by a measuring device is measurable.
  • two on different electrical Potential electrodes that are spaced apart by a dielectric are, form a capacitor whose capacitance can be measured, for example by measuring the reactance generated by the capacitor in an in an AC circuit or a Wheatstone bridge.
  • the capacitance is inversely proportional to the distance between the electrodes. So if the laundry drum is loaded by the loading of laundry and itself the laundry drum lowers, the distance between the jacket wall decreases the washing drum and one outside the washing drum within the height of the shaft driving the laundry drum fixed electrode. If the Electrode for example above the washing drum the height of the washing drum driving shaft is arranged, the distance increases, and the capacity of the capacitor formed by the two electrodes is reduced. If the second electrode fixed below the height of the drive shaft of the laundry drum the capacity increases when loaded. The second electrode is advantageous arranged either below or above the laundry drum.
  • a plurality of second electrodes are preferably also used, for example both above and below the laundry drum, each with the laundry drum as interact with the first electrode. Then if the individual capacitors in parallel the capacitors of the individual capacitors add up, and the measurement accuracy in measuring a change in weight becomes even greater.
  • the washing drum is made of metal, the washing drum itself forms the electrode. If the washing drum is made of plastic, it can be electrically conductive Arrange the ring on the outer surface of the laundry drum, as it is already the case with a dryer is used as a sliding contact for measuring laundry moisture. A Such an annular electrode can then additionally be used as the first electrode for measurement the load in conjunction with at least one second electrode by using of the capacitive effect.
  • the weight of the laundry load can be before Determine the program start of the laundry treatment device.
  • a is also preferred Display element is provided, which is integrated for example in the control panel and either as a numerical display or as an illuminated display, for example in the form of a Light bar works.
  • the laundry load obtained by means of the device according to the invention can be also use in a control device provided in the laundry treatment device, which can be fed from the measuring device, so that the treatment of the filled Linen items are made taking into account the weight of the laundry is, for example, the measurement of the amount of water, the detergent, the mechanical Treatment in a washing machine or to calculate the drying time in a tumble dryer, provided data on the moisture content in the laundry are available.
  • the measuring device is connected to the control device, it can also directly be integrated into it.
  • a tub 1 consists of a non-conductive material, for example Plastic, and carries in its rear wall 2 a shaft journal 3 of a laundry drum 4.
  • the shaft journal 3 is via roller bearings 5, 6 in a received by the rear wall 2 Bearing sleeve 7 stored.
  • the tub 1 carries an electrode 9 on the outside of a jacket wall 8 is connected to a voltage source and is at an electrical potential.
  • the Electrode 9 is on the jacket wall 8 of a jacket wall 10 of the laundry drum 4th Cut.
  • the jacket wall 10 is preferably grounded and forms a second electrode. Form due to the potential difference between the electrode 9 and the jacket wall 10 this a capacitor, the electrode 9 and the jacket wall 10 by a Dielectric are separated from each other.
  • the dielectric material is the air as well as that Plastic material from which the jacket wall 8 is made.
  • the jacket wall 8 consists of a metal, that is to say is electrically conductive, it can be used instead of the electrode 9 as an electrode, provided for an electrical separation between the washing drum 4 (consisting of a metal) and the jacket wall 8 is taken care of.
  • the rear wall 2 of the tub 1 is made of plastic.
  • a laundry drum can also be used Insert 4 made of plastic, provided that 4 or a separate electrode is arranged on the outside of the washing drum 4 with the jacket wall 8, if this serves as an electrode, or with the electrode 9 as a capacitor works.
  • Insert 4 made of plastic provided that 4 or a separate electrode is arranged on the outside of the washing drum 4 with the jacket wall 8, if this serves as an electrode, or with the electrode 9 as a capacitor works.
  • the use of a ring-shaped on the jacket wall is particularly suitable a drum arranged in a tumble dryer.
  • Electrodes can also be used provide on the outer or inner wall of the jacket wall 8.
  • the arrangement of electrodes on the outer or inner wall of the Sheath wall 10 if the sheath wall 10 consists of a non-conductive material.
  • a further electrode 9 ′ can also be provided on the side of the laundry drum 4 opposite the electrode 9, that is to say on the underside of the tub 1 on its jacket wall 8, in which case then by reducing the distance between the jacket wall 8 and the jacket wall 10 Loading of the laundry drum occurs a positive change in capacity.
  • the electrodes 9 and 9 ' can then also be connected in parallel to one another in order to measure the sum of the two changes in capacitance, so that a smaller measurement error occurs.
  • the measuring method described here is not only suitable for static measurements with Loading or unloading the laundry drum 4, but also for measuring unbalance Rotation of the laundry drum 4. If around the circumference of the tub 2 several electrodes 9, 9 'are provided, which are preferably equally spaced distribute on the outer circumference or the inner circumference of the jacket wall 8, can by measuring the changes in capacitance that occur with unbalance Detect position of the occurrence of the unbalance, so that, for example, after the Imbalances have been detected, the laundry can be redistributed to, for example, afterwards to start a new spin cycle.
  • the electrode 9 is connected to a measuring device 12 via a line 11; this is in turn connected to a control device 16.
  • the electrically conductive jacket wall 10 of the laundry drum 4 is also via an electrically conductive bottom wall 13 the shaft journal 3, which consists of a metal, a sliding contact 14 and a line 15 connected to the measuring device 12. There is therefore the potential difference between the electrode 9 and the jacket wall 10 as an electrical signal and is the Control device 16 supplied.
  • the signals are preferably stored in a memory 17 which is assigned to the control device 16 is stored in order to make a comparison between different capacitance values with corresponding states of the laundry drum 4 to enable. From the data available in the control device 16 customer service information can also be obtained; there can be alarm displays or generate error displays that are displayed, for example, on the control panel become.
  • the capacitance values can also be used for laundry treatment to influence in the laundry treatment device. For example, from the capacity value or a change in capacity and the information that can be extracted from it conclude about the weight of the laundry or change in weight of the laundry drum 4, how much water, detergent etc. are used for the washing process have to. By comparing currently measured capacity values with stored capacity values distance changes between the washing drum 4 and grasp the tub.
  • an electrical contact can also be made on the outer bearing shell of the ball bearing 6 and then via the line 15 with the Control device 16 may be connected.
  • the laundry machine is on Tumble dryer, it can be determined which drying time is necessary, if the Moisture content of the laundry is known.
  • a prerequisite for the use of the invention is a laundry drum mounted on one side, which is preferably mounted horizontally, but the invention can also be then use when the washing drum 4 is inclined to the horizontal, for example by up to 15 °.
  • the single electrode 9 several can also be used Electrodes side by side on the outer circumference or the inner circumference of the jacket wall Arrange 8. The same applies to the arrangement of several electrodes on or within the jacket wall 10, provided the jacket wall 10 is made of a non-conductive Material exists. All electrodes can also be designed as ring-shaped electrodes.

Abstract

The device has a first electrode formed by or attached to a wall of a washing drum (4) and at a first potential and a second fixed electrode (9) at a second potential at a small distance from the first electrode. The distance varies with load and the capacitance corresponding to the distance is measured by a measurement device (16). Independent claims are also included for the following: a method of measuring the weight of a washing load in a washing machine.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Messung der Beladung in einem Wäschebehandlungsgerät, in dem eine Wäschetrommel drehbar gelagert ist. Ebenso bezieht sich die Erfindung auf ein Verfahren zur Messung der Beladung.The invention relates to a device for measuring the load in a laundry treatment device, in which a laundry drum is rotatably mounted. Likewise relates the invention relates to a method for measuring the load.

Aus der DE 37 36 809 A1 ist ein Wäschebehandlungsgerät, d. h. eine Haushaltwaschmaschine oder Wäscheschleuder, bekannt, bei der zur Messung der Trommelbeladung ein Meßmittel vorhanden ist. Bei der bekannten Vorrichtung beruht die Messung darauf, daß ein zur Beschleunigung einer mit Wäsche beladenen Trommel erforderliches Drehmoment direkt gemessen wird. Dadurch sollen Störgrößen, wie beispielsweise Keilriemenverluste, ausgeklammert werden.DE 37 36 809 A1 discloses a laundry treatment device, i. H. a household washing machine or spin dryer, known, for measuring the drum load Measuring equipment is available. In the known device, the measurement is based on the fact that a torque required to accelerate a drum loaded with laundry is measured directly. This should cause disturbances such as V-belt losses to be excluded.

Das bekannte Verfahren setzt demnach voraus, daß das Wäschebehandlungsgerät bereits in Betrieb gesetzt wird, um eine Messung des Wäschegewichts durchführen zu können.The known method therefore presupposes that the laundry treatment device already is put into operation in order to be able to measure the laundry weight.

Gemäß der DE 38 38 998 A1 wird die Beladung einer Haushaltswaschmaschine dadurch gemessen, daß der Laugenbottich über Aufhängefedern aufgehängt ist, deren Federweg von der Federbelastung abhängt, so daß die Federn entsprechend dem Gewicht des Laugenbottichs ausgelenkt werden. Da nur das Gesamtgewicht von Laugenbottich, Wäschetrommel und Wäschebefüllung gemessen wird, ist die relative Veränderung der Federauslenkung durch Be- und Entladen der Wäsche verhältnismäßig gering. According to DE 38 38 998 A1, the loading of a household washing machine is thereby measured that the tub is suspended on suspension springs, their travel depends on the spring load, so that the springs according to the weight of the tub be deflected. Since only the total weight of the tub, laundry drum and laundry load is measured is the relative change in spring deflection by loading and unloading the laundry relatively low.

Es ist die Aufgabe der Erfindung, eine Vorrichtung der eingangs genannten Art derartig zu verbessern, daß eine einfache Messung des Gewichts der Beladung der Wäschetrommel möglich ist.It is the object of the invention to provide a device of the type mentioned at the outset to improve that a simple measurement of the weight of the load on the laundry drum is possible.

Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung der eingangs genannten Art dadurch gelöst, daß eine erste, durch eine Wandung der Wäschetrommel gebildete oder auf der Wandung der Wäschetrommel angeordnete, auf einem ersten elektrischen Potential liegende Elektrode und eine zweite, ortsfest auf einem zweiten elektrischen Potential liegende Elektrode unter einem geringen Abstand zu einander angeordnet sind, der durch Beladung oder Entladung der Abstand der Elektroden veränderbar ist, und daß eine jeweils einem Abstand der Elektroden entsprechende Kapazität durch eine Meßeinrichtung meßbar ist.According to the invention, this object is achieved in a device of the type mentioned solved in that a first, formed by a wall of the laundry drum or arranged on the wall of the laundry drum, at a first electrical potential lying electrode and a second, fixed at a second electrical potential lying electrode are arranged at a short distance from each other the distance between the electrodes can be changed by loading or unloading, and that a capacitance corresponding to a distance between the electrodes by a measuring device is measurable.

Gemäß der Erfindung wird somit ausgenutzt, daß zwei auf unterschiedlichem elektrischem Potential liegende Elektroden, die durch ein Dielektrikum voneinander beabstandet sind, einen Kondensator bilden, dessen Kapazität gemessen werden kann, beispielsweise durch Messung der von dem Kondensator erzeugten Blindwiderstandes in einem in einem Wechselstromkreis oder mittels einer Wheatstone-Meßbrücke.According to the invention, it is thus exploited that two on different electrical Potential electrodes that are spaced apart by a dielectric are, form a capacitor whose capacitance can be measured, for example by measuring the reactance generated by the capacitor in an in an AC circuit or a Wheatstone bridge.

Dabei ist die Kapazität umgekehrt proportional zum Abstand der Elektroden voneinander. Wenn also die Wäschetrommel durch das Einfüllen von Wäsche belastet wird und sich die Wäschetrommel nach unten senkt, verringert sich der Abstand zwischen der Mantelwand der Wäschetrommel und einer außerhalb der Wäschetrommel innerhalb der Höhe der die Wäschetrommel antreibenden Welle fest angeordneten Elektrode. Sofern die Elektrode beispielsweise oberhalb der die Wäschetrommel der Höhe der die Wäschetrommel antreibenden Welle angeordnet ist, vergrößert sich der Abstand, und die Kapazität des von den beiden Elektroden gebildeten Kondensators verringert sich. Sofern die zweite Elektrode unterhalb der Höhe der Antriebswelle der Wäschetrommel fest angeordnet ist, vergrößert sich die Kapazität bei Beladung. Vorteilhaft wird die zweite Elektrode entweder unterhalb oder oberhalb der Wäschetrommel angeordnet.The capacitance is inversely proportional to the distance between the electrodes. So if the laundry drum is loaded by the loading of laundry and itself the laundry drum lowers, the distance between the jacket wall decreases the washing drum and one outside the washing drum within the height of the shaft driving the laundry drum fixed electrode. If the Electrode for example above the washing drum the height of the washing drum driving shaft is arranged, the distance increases, and the capacity of the capacitor formed by the two electrodes is reduced. If the second electrode fixed below the height of the drive shaft of the laundry drum the capacity increases when loaded. The second electrode is advantageous arranged either below or above the laundry drum.

Vorzugsweise werden auch mehrere zweite Elektroden eingesetzt, beispielsweise sowohl oberhalb als auch unterhalb der Wäschetrommel, die jeweils mit der Wäschetrommel als der ersten Elektrode zusammenwirken. Wenn dann die einzelnen Kondensatoren parallel zueinander geschaltet sind, addieren sich die Kapazitäten der einzelnen Kondensatoren, und die Meßgenauigkeit bei der Messung einer Gewichtsveränderung wird noch größer.A plurality of second electrodes are preferably also used, for example both above and below the laundry drum, each with the laundry drum as interact with the first electrode. Then if the individual capacitors in parallel the capacitors of the individual capacitors add up, and the measurement accuracy in measuring a change in weight becomes even greater.

Wenn die Wäschetrommel aus Metall besteht, bildet die Wäschetrommel selbst die Elektrode. Sofern die Wäschetrommel aus Kunststoff besteht, läßt sich ein elektrisch leitender Ring auf der Mantelfläche der Wäschetrommel anordnen, wie er bereits bei einem Wäschetrockner als Schleifkontakt zur Messung der Wäschefeuchte Verwendung findet. Eine derartige ringförmige Elektrode läßt sich dann zusätzlich als erste Elektrode zur Messung der Beladung in Verbindung mit mindestens einer zweiten Elektrode unter Ausnutzung des kapazitiven Effekts verwenden.If the washing drum is made of metal, the washing drum itself forms the electrode. If the washing drum is made of plastic, it can be electrically conductive Arrange the ring on the outer surface of the laundry drum, as it is already the case with a dryer is used as a sliding contact for measuring laundry moisture. A Such an annular electrode can then additionally be used as the first electrode for measurement the load in conjunction with at least one second electrode by using of the capacitive effect.

Gemäß der Erfindung läßt sich das Gewicht der Wäschebeladung bereits vor dem Programmstart des Wäschebehandlungsgeräts ermitteln. Vorzugsweise ist auch eine Anzeigeelement vorgesehen, das beispielsweise in die Bedienblende integriert ist und entweder als numerische Anzeige oder als Leuchtanzeige, etwa in Form eines Leuchtbalkens funktioniert. Dadurch erhält der Bediener bereits beim Befüllen des Wäschebehandlungsgeräts Aufschluß darüber, wieviel Wäsche er noch zugeben darf, um einerseits eine optimale Ausnutzung des Wäschebehandlungsgeräts zu erreichen und andererseits eine Überfüllung zu vermeiden.According to the invention, the weight of the laundry load can be before Determine the program start of the laundry treatment device. A is also preferred Display element is provided, which is integrated for example in the control panel and either as a numerical display or as an illuminated display, for example in the form of a Light bar works. As a result, the operator already receives when filling the Laundry treatment device Information about how much laundry he can still add to on the one hand to achieve optimal utilization of the laundry treatment device and on the other hand to avoid overcrowding.

Die mittels der erfindungsgemäßen Vorrichtung gewonnene Wäschebeladung läßt sich auch in einer in dem Wäschebehandlungsgerät vorgesehenen Steuereinrichtung verwenden, der sie von der Meßeinrichtung zuführbar ist, so daß die Behandlung des eingefüllten Wäschepostens unter Berücksichtigung des Gewichts der Wäsche vorgenommen wird, beispielsweise die Bemessung der Wassermenge, des Waschmittels, der mechanischen Behandlung in einer Waschmaschine oder zur Berechnung der Trocknungsdauer in einem Wäschetrockner, sofern Daten über den Feuchtegehalt in der Wäsche vorliegen. Die Meßeinrichtung steht mit der Steuereinrichtung in Verbindung, sie kann auch direkt in ihr integriert sein.The laundry load obtained by means of the device according to the invention can be also use in a control device provided in the laundry treatment device, which can be fed from the measuring device, so that the treatment of the filled Linen items are made taking into account the weight of the laundry is, for example, the measurement of the amount of water, the detergent, the mechanical Treatment in a washing machine or to calculate the drying time in a tumble dryer, provided data on the moisture content in the laundry are available. The measuring device is connected to the control device, it can also directly be integrated into it.

Nachstehend wird die Erfindung in einem Ausführungsbeispiel anhand der einzigen Figur näher erläutert. Diese zeigt einen Laugenbehälter mit einer in ihm drehbar angeordneten Wäschetrommel im Querschnitt. In the following, the invention is illustrated in an exemplary embodiment with reference to the single figure explained in more detail. This shows a tub with one rotatably arranged in it Cross-sectional laundry drum.

Ein Laugenbehälter 1 besteht aus einem nicht leitenden Material, beispielsweise aus Kunststoff, und trägt in seiner Rückwand 2 einen Wellenzapfen 3 einer Wäschetrommel 4. Der Wellenzapfen 3 ist über Wälzlager 5, 6 in einer von der Rückwand 2 aufgenommenen Lagerhülse 7 gelagert.A tub 1 consists of a non-conductive material, for example Plastic, and carries in its rear wall 2 a shaft journal 3 of a laundry drum 4. The shaft journal 3 is via roller bearings 5, 6 in a received by the rear wall 2 Bearing sleeve 7 stored.

Der Laugenbehälter 1 trägt auf der Außenseite einer Mantelwand 8 eine Elektrode 9, die mit einer Spannungsquelle verbunden ist und auf einem elektrischen Potential liegt. Die Elektrode 9 ist über die Mantelwand 8 von einer Mantelwand 10 der Wäschetrommel 4 getrennt. Die Mantelwand 10 ist vorzugsweise geerdet und bildet eine zweite Elektrode. Aufgrund der Potentialdifferenz zwischen der Elektrode 9 und der Mantelwand 10 bilden diese einen Kondensator aus, wobei die Elektrode 9 und die Mantelwand 10 durch ein Dielektrikum voneinander getrennt sind. Das dielektrische Material ist die Luft sowie das Kunststoffmaterial, aus dem die Mantelwand 8 besteht.The tub 1 carries an electrode 9 on the outside of a jacket wall 8 is connected to a voltage source and is at an electrical potential. The Electrode 9 is on the jacket wall 8 of a jacket wall 10 of the laundry drum 4th Cut. The jacket wall 10 is preferably grounded and forms a second electrode. Form due to the potential difference between the electrode 9 and the jacket wall 10 this a capacitor, the electrode 9 and the jacket wall 10 by a Dielectric are separated from each other. The dielectric material is the air as well as that Plastic material from which the jacket wall 8 is made.

Sofern die Mantelwand 8 aus einem Metall besteht, also elektrisch leitend ist, kann sie anstelle der Elektrode 9 als Elektrode verwendet werden, sofern für eine elektrische Trennung zwischen der (aus einem Metall bestehenden) Wäschetrommel 4 und der Mantelwand 8 gesorgt ist. Diese läßt sich beispielsweise dadurch realisieren, daß die Rückwand 2 des Laugenbehälters 1 aus Kunststoff besteht. Alternativ läßt sich auch eine Wäschetrommel 4 aus Kunststoff einsetzen, sofern auf der Innenseite der Wäschetrommel 4 oder auf der Außenseite der Wäschetrommel 4 eine gesonderte Elektrode angeordnet ist, die mit der Mantelwand 8, sofern diese als Elektrode dient, oder mit der Elektrode 9 als Kondensator wirkt. Besonders geeignet ist der Einsatz einer ringförmigen, auf der Mantelwand einer Trommel in einem Wäschetrockner angeordneten Elektrode.If the jacket wall 8 consists of a metal, that is to say is electrically conductive, it can can be used instead of the electrode 9 as an electrode, provided for an electrical separation between the washing drum 4 (consisting of a metal) and the jacket wall 8 is taken care of. This can be achieved, for example, in that the rear wall 2 of the tub 1 is made of plastic. Alternatively, a laundry drum can also be used Insert 4 made of plastic, provided that 4 or a separate electrode is arranged on the outside of the washing drum 4 with the jacket wall 8, if this serves as an electrode, or with the electrode 9 as a capacitor works. The use of a ring-shaped on the jacket wall is particularly suitable a drum arranged in a tumble dryer.

Anstelle der einzigen Elektrode 9 gemäß der Figur lassen sich auch mehrere Elektroden auf der äußeren oder der inneren Wandung der Mantelwand 8 vorsehen. Entsprechendes gilt für die Anordnung von Elektroden auf der äußeren oder inneren Wandung der Mantelwand 10, sofern die Mantelwand 10 aus einem nicht leitenden Material besteht.Instead of the single electrode 9 according to the figure, several electrodes can also be used provide on the outer or inner wall of the jacket wall 8. Corresponding applies to the arrangement of electrodes on the outer or inner wall of the Sheath wall 10, if the sheath wall 10 consists of a non-conductive material.

Bei Einbringen eines Wäschepostens in die Wäschetrommel 4 biegt sich diese nach unten durch, und nimmt dann eine Position 4 ein. Dadurch vergrößert sich der Abstand zwischen der Mantelwand 10 und der Elektrode 9 um As. Dadurch ändert sich die Kapazität C um: ΔC = εO × ε × AΔs wobei A die Fläche zwischen den Elektroden, εo die Dielektrizitätskonstante und ε die Dielektrizitätszahl des die Elektrode 9 und die Mantelwand 10 voneinander trennenden Mediums oder der sie voneinander trennenden Medien bedeuten.Daraus folgt auch, daß es vorteilhaft ist, wenn die Elektrode 9 eine große Fläche einnimmt. Dann läßt sich eine größere Kapazitätsänderung feststellen. Vorzugsweise kann auch auf der der Elektrode 9 gegenüberliegenden Seite der Wäschetrommel 4, also auf der Unterseite des Laugenbehälters 1 an dessen Mantelwand 8 eine weitere Elektrode 9' vorgesehen sein, bei der dann durch die Verringerung des Abstands zwischen der Mantelwand 8 und der Mantelwand 10 bei Beladung der Wäschetrommel eine positive Kapazitätsänderung eintritt. Die Elektrode 9 und 9' lassen sich dann auch parallel zueinander schalten, um die Summe der beiden Kapazitätsänderungen zu messen, so daß ein geringerer Meßfehler auftritt.When a laundry item is introduced into the laundry drum 4, it bends downward and then assumes a position 4. This increases the distance between the jacket wall 10 and the electrode 9 by As. This changes the capacitance C by: ΔC = εO × ε × A Δs where A is the area between the electrodes, ε o the dielectric constant and ε the dielectric constant of the medium or the media separating the electrode 9 and the jacket wall 10. It also follows that it is advantageous if the electrode 9 has a large size Takes up space. Then a larger change in capacity can be determined. Preferably, a further electrode 9 ′ can also be provided on the side of the laundry drum 4 opposite the electrode 9, that is to say on the underside of the tub 1 on its jacket wall 8, in which case then by reducing the distance between the jacket wall 8 and the jacket wall 10 Loading of the laundry drum occurs a positive change in capacity. The electrodes 9 and 9 'can then also be connected in parallel to one another in order to measure the sum of the two changes in capacitance, so that a smaller measurement error occurs.

Die hier beschriebene Meßmethode eignet sich nicht nur zur statischen Messung beim Be- oder Entladen der Wäschetrommel 4, sondern auch zur Messung von Unwuchten bei Umdrehung der Wäschetrommel 4. Sofern um den Umfang des Laugenbehälters 2 herum mehrere Elektroden 9, 9', vorgesehen sind, die vorzugsweise gleich beabstandet sich auf dem äußeren Umfang oder dem inneren Umfang der Mantelwand 8 verteilen, läßt sich durch Messung der Kapazitätsänderungen, die bei Unwuchten auftreten, auch die Position des Auftretens der Unwuchten erfassen, so daß beispielsweise, nachdem die Unwuchten erfaßt worden sind, die Wäsche umverteilt werden kann, um danach beispielsweise einen neuen Schleudervorgang zu starten.The measuring method described here is not only suitable for static measurements with Loading or unloading the laundry drum 4, but also for measuring unbalance Rotation of the laundry drum 4. If around the circumference of the tub 2 several electrodes 9, 9 'are provided, which are preferably equally spaced distribute on the outer circumference or the inner circumference of the jacket wall 8, can by measuring the changes in capacitance that occur with unbalance Detect position of the occurrence of the unbalance, so that, for example, after the Imbalances have been detected, the laundry can be redistributed to, for example, afterwards to start a new spin cycle.

Mittels der Messung der Kapazitätsänderung lassen sich auch Informationen über die mechanische Stabilität und die Schwingungsverhältnisse des Laugenbehälters 1 ermitteln. So lassen sich beispielsweise Abstandsveränderungen während eines Waschvorgangs zwischen den Mantelwänden 8 und 10 ermitteln, oder es lassen sich auch langfristige Veränderungen des Abstands zwischen den Mantelwänden 8 und 10 erfassen. Die Elektrode 9 ist über eine Leitung 11 mit einer Meßeinrichtung 12 verbunden; diese ist ihrerseits mit einer Steuereinrichtung 16 verbunden. Die elektrisch leitende Mantelwand 10 der Wäschetrommel 4 ist über eine ebenfalls elektrisch leitende Bodenwand 13, über den Wellenzapfen 3, der aus einem Metall besteht, einen Schleifkontakt 14 und eine Leitung 15 mit der Meßeinrichtung 12 verbunden. Dort liegt somit die Potentialdifferenz zwischen der Elektrode 9 und der Mantelwand 10 als elektrisches Signal vor und wird der Steuereinrichtung 16 zugeführt. Vorzugsweise werden die Signale in einem Speicher 17 der der Steuereinrichtung 16 zugeordnet ist, abgespeichert, um einen Vergleich zwischen verschiedenen Kapazitätswerten bei einander entsprechenden Zuständen der Wäschetrommel 4 zu ermöglichen. Aus den in der Steuereinrichtung 16 vorliegenden Daten lassen sich auch Informationen für den Kundendienst gewinnen; es lassen sich Alarmanzeigen oder Fehleranzeigen erzeugen, die beispielsweise in der Bedienblende angezeigt werden. Ebenso lassen sich die Kapazitätswerte verwenden, um die Wäschebehandlung in dem Wäschebehandlungsgerät zu beeinflussen. Beispielsweise läßt sich aus dem Kapazitätswert oder einer Kapazitätsänderung und der daraus entnehmbaren Information über das Gewicht der Wäsche oder Gewichtsveränderung der Wäschetrommel 4 schliessen, wieviel Wasser, Reinigungsmittel etc. für den Waschprozeß eingesetzt werden müssen. Durch Vergleich aktuell gemessener Kapazitätswerte mit abgespeicherten Kapazitätswerten lassen sich auch Abstandsänderungen zwischen der Wäschetrommel 4 und den Laugenbehälter erfassen.By measuring the change in capacity, information about the determine mechanical stability and the vibration conditions of the tub 1. For example, changes in distance during a washing process determine between the jacket walls 8 and 10, or long-term Detect changes in the distance between the jacket walls 8 and 10. The electrode 9 is connected to a measuring device 12 via a line 11; this is in turn connected to a control device 16. The electrically conductive jacket wall 10 of the laundry drum 4 is also via an electrically conductive bottom wall 13 the shaft journal 3, which consists of a metal, a sliding contact 14 and a line 15 connected to the measuring device 12. There is therefore the potential difference between the electrode 9 and the jacket wall 10 as an electrical signal and is the Control device 16 supplied. The signals are preferably stored in a memory 17 which is assigned to the control device 16 is stored in order to make a comparison between different capacitance values with corresponding states of the laundry drum 4 to enable. From the data available in the control device 16 customer service information can also be obtained; there can be alarm displays or generate error displays that are displayed, for example, on the control panel become. The capacitance values can also be used for laundry treatment to influence in the laundry treatment device. For example, from the capacity value or a change in capacity and the information that can be extracted from it conclude about the weight of the laundry or change in weight of the laundry drum 4, how much water, detergent etc. are used for the washing process have to. By comparing currently measured capacity values with stored capacity values distance changes between the washing drum 4 and grasp the tub.

Anstelle des Einsatzes des Schleifkontakts 14 kann ein elektrischer Kontakt auch an der äußeren Lagerschale des Kugellagers 6 angeordnet und dann über die Leitung 15 mit der Steuereinrichtung 16 verbunden sein. Wenn das Wäschebehandlungsgerät ein Wäschetrockner ist, läßt sich ermitteln, welche Trockenzeit notwendig ist, sofern der Feuchtegehalt der Wäsche bekannt ist.Instead of using the sliding contact 14, an electrical contact can also be made on the outer bearing shell of the ball bearing 6 and then via the line 15 with the Control device 16 may be connected. When the laundry machine is on Tumble dryer, it can be determined which drying time is necessary, if the Moisture content of the laundry is known.

Es zeigt sich somit erfindungsgemäß, daß die Gewinnung der Kapazität oder der Kapazitätsdifferenz gegenüber einem vorhergehenden Wert eine Information über den Zustand des Wäschepostens in der Wäschetrommel 4 liefert.It is thus shown according to the invention that the extraction of the capacity or the capacity difference information about the state compared to a previous value of the laundry item in the laundry drum 4 delivers.

Voraussetzung für die Einsatz der Erfindung ist eine einseitig gelagerte Wäschetrommel, wobei diese bevorzugt waagerecht gelagert ist, jedoch läßt sich die Erfindung ebenfalls dann einsetzen, wenn die Wäschetrommel 4 gegenüber der Horizontalen geneigt ist, beispielsweise um bis zu 15°. Anstelle der einzigen Elektrode 9 lassen sich auch mehrere Elektroden nebeneinander auf dem äußeren Umfang oder dem inneren Umfang der Mantelwand 8 anordnen. Entsprechendes gilt auch für die Anordnung mehrerer Elektroden auf oder innerhalb der Mantelwand 10, sofern die Mantelwand 10 aus einem nicht leitenden Material besteht. Alle Elektroden lassen sich auch als ringförmige Elektroden ausbilden.A prerequisite for the use of the invention is a laundry drum mounted on one side, which is preferably mounted horizontally, but the invention can also be then use when the washing drum 4 is inclined to the horizontal, for example by up to 15 °. Instead of the single electrode 9, several can also be used Electrodes side by side on the outer circumference or the inner circumference of the jacket wall Arrange 8. The same applies to the arrangement of several electrodes on or within the jacket wall 10, provided the jacket wall 10 is made of a non-conductive Material exists. All electrodes can also be designed as ring-shaped electrodes.

Claims (21)

Vorrichtung zur Messung der Beladung einer waagerecht oder geneigt liegend gelagerten Wäschetrommel (4) in einem Wäschebehandlungsgerät, dadurch gekennzeichnet, daß eine erste, durch eine Wandung der Wäschetrommel (4) gebildete oder auf der Wandung der Wäschetrommel (4) angeordnete, auf einem ersten Potential liegende Elektrode und eine zweite ortsfest auf einem zweiten elektrischen Potential liegende Elektrode (9) unter einem geringen Abstand zueinander angeordnet sind, der durch Beladung oder Entladung veränderbar ist, und daß eine jeweils einem Abstand der Elektroden (9) entsprechende Kapazität durch eine Meßeinrichtung (16) meßbar ist.Device for measuring the loading of a horizontally or inclined laundry drum (4) in a laundry treatment device, characterized in that a first potential, formed by a wall of the laundry drum (4) or arranged on the wall of the laundry drum (4), has a first potential lying electrode and a second electrode (9) fixed at a second electrical potential are arranged at a short distance from each other, which can be changed by loading or unloading, and in that a capacitance corresponding to a distance between the electrodes (9) is measured by a measuring device ) is measurable. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Meßeinrichtung mit einer Steuereinrichtung (16) des Wäschebehandlungsgeräts verbunden ist und daß von der Meßeinrichtung (12) gemessene Werte in der Steuereinrichtung (16) auswertbar sind.Device according to claim 1, characterized in that the measuring device is connected to a control device (16) of the laundry treatment device and that values measured by the measuring device (12) can be evaluated in the control device (16). Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein Speicher (17) vorhanden ist, in dem die Kapazität oder Kapazitätsänderungen abspeicherbar sind.Apparatus according to claim 1 or 2, characterized in that a memory (17) is present in which the capacity or changes in capacity can be stored. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die ortsfeste Elektrode (9) auf der Innenseite oder Außenseite einer Mantelwand (8) eines Laugenbehälters (1) angeordnet ist, wobei die Mantelwand (8) aus einem dielektrischen Material besteht. Device according to one of claims 1 to 3, characterized in that the stationary electrode (9) is arranged on the inside or outside of a jacket wall (8) of a tub (1), the jacket wall (8) consisting of a dielectric material. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die zweite Elektrode durch die Mantelwand (8) des Laugenbehälters (1) gebildet ist, wobei die Mantelwand (8) aus einem elektrisch leitenden Material gebildet ist und elektrisch von einem Wellenzapfen (3) getrennt ist, über den die Wäschetrommel (4) in einer Rückwand (2) des Laugenbehälters (1) gelagert ist.Device according to one of claims 1 to 3, characterized in that the second electrode is formed by the jacket wall (8) of the tub (1), the jacket wall (8) being formed from an electrically conductive material and electrically by a shaft journal (3 ) is separated, via which the laundry drum (4) is mounted in a rear wall (2) of the tub (1). Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Rückwand (2) aus einem elektrisch nicht letenden Material besteht.Device according to claim 5, characterized in that the rear wall (2) consists of an electrically non-lethal material. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Elektrode (9) ringförmig ausgebildet ist.Device according to claim 5 or 6, characterized in that the electrode (9) is annular. Vorrichtung nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß mehrere Elektroden (9, 9') auf der Innenseite oder Außenseite der Mantelwand (8) des Laugenbehälters (1) angeordnet sind.Device according to one of claims 5 to 7, characterized in that a plurality of electrodes (9, 9 ') are arranged on the inside or outside of the jacket wall (8) of the tub (1). Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Wäschetrommel (4) eine elektrisch leitfähige Mantelwand (10) aufweist und daß diese als erste Elektrode dient, daß die Mantelwand (10) elektrisch leitend mit dem Wellenzapfen (3) verbunden ist und daß dieser elektrisch leitend mit der Meßeinrichtung (12) verbunden ist.Device according to one of claims 1 to 8, characterized in that the laundry drum (4) has an electrically conductive jacket wall (10) and that this serves as the first electrode, that the jacket wall (10) is electrically conductively connected to the shaft journal (3) and that this is electrically conductively connected to the measuring device (12). Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß der Wellenzapfen (3) über einen Schleifkontakt (14) mit der Meßeinrichtung (12) verbunden ist.Device according to claim 9, characterized in that the shaft journal (3) is connected to the measuring device (12) via a sliding contact (14). Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Mantelwand (10) der Wäschetrommel (4) aus einem dielektrischen Material besteht, daß auf der Außenseite oder Innenseite der Mantelwand (10) mindestens eine Elektrode angeordnet ist und daß diese elektrisch leitend mit dem Wellenzapfen (3) verbunden ist und dieser seinerseits mit der Meßeinrichtung verbunden ist.Device according to one of claims 1 to 9, characterized in that the jacket wall (10) of the laundry drum (4) consists of a dielectric material, that at least one electrode is arranged on the outside or inside of the jacket wall (10) and that this is electrically conductive is connected to the shaft journal (3) and this in turn is connected to the measuring device. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß Elektroden (9, 9') sowohl auf dem oberen Rand des Laugenbehälters (1) als auch auf dem unteren Rand des Laugenbehälters (1) angeordnet sind. Device according to one of claims 1 to 4, characterized in that electrodes (9, 9 ') are arranged both on the upper edge of the tub (1) and on the lower edge of the tub (1). Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, daß die Elektroden (9) einander gegenüberliegen.Device according to claim 12, characterized in that the electrodes (9) lie opposite one another. Vorrichtung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, daß die Meßeinrichtung (12) in einer Steuereinrichtung (12) des Wäschebehandlungsgeräts angeordnet oder mit dieser verbunden ist.Device according to one of claims 1 to 13, characterized in that the measuring device (12) is arranged in a control device (12) of the laundry treatment device or is connected to the latter. Vorrichtung nach einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, daß die Meßeinrichtung (12) mit einem Speicher (16) verbunden ist, in dem Kapazitätswerte oder Kapazitätsänderungen abspeicherbar sind.Device according to one of claims 1 to 14, characterized in that the measuring device (12) is connected to a memory (16) in which capacitance values or changes in capacitance can be stored. Verfahren zur Messung des Gewichts eines Wäschepostens in einem Wäschebehandlungsgerät, dadurch gekennzeichnet, daß eine Kapazitätsänderung während des Beladens einer Wäschetrommel 4 gemessen wird.Method for measuring the weight of a laundry item in a laundry treatment device, characterized in that a change in capacity during the loading of a laundry drum 4 is measured. Verfahren nach Anspruch 16, dadurch gekennzeichnet, daß der gemessene Wert angezeigt wird.A method according to claim 16, characterized in that the measured value is displayed. Verfahren nach Anspruch 16 oder 17, dadurch gekennzeichnet, daß bei Überladung der Wäschetrommel (4) ein Alarmsignal erzeugt wird.Method according to claim 16 or 17, characterized in that an alarm signal is generated when the laundry drum (4) is overloaded. Verfahren nach einem der Ansprüche 16 bis 18, dadurch gekennzeichnet, daß Kapazitätsänderungen während des Betriebs des Wäschebehandlungsgeräts gemessen werden und daß aus den Kapazitätswerten Unwuchten der Wäschetrommel (4) bei der Umdrehung ermittelt werden.Method according to one of claims 16 to 18, characterized in that changes in capacity during operation of the laundry treatment device are measured and that imbalances in the laundry drum (4) during the rotation are determined from the capacity values. Verfahren nach einem der Ansprüche 16 bis 18, dadurch gekennzeichnet, daß Kapazitätswerte gemessen werden und mit in einem Speicher (17) gespeicherten Werten für Kapazitäten verglichen werden, um Abstandsänderungen zwischen der Wäschetrommel (4) und dem Laugenbehälter (1) zu ermitteln.Method according to one of Claims 16 to 18, characterized in that capacitance values are measured and compared with values for capacities stored in a memory (17) in order to determine changes in the distance between the washing drum (4) and the tub (1). Verfahren nach Anspruch 19, dadurch gekennzeichnet, daß aus gemessenen Kapazitätsänderungen auf den Zustand des Laugenbehälters (1) geschlossen wird.Method according to Claim 19, characterized in that the state of the tub (1) is inferred from measured changes in capacity.
EP00124851A 1999-12-14 2000-11-14 Device and method for measuring the load in a washing machine Expired - Lifetime EP1108809B1 (en)

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ES2226688T3 (en) 2005-04-01
ATE274091T1 (en) 2004-09-15

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