EP1932960B1 - Method for controlling a washing machine - Google Patents

Method for controlling a washing machine Download PDF

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Publication number
EP1932960B1
EP1932960B1 EP07023797.9A EP07023797A EP1932960B1 EP 1932960 B1 EP1932960 B1 EP 1932960B1 EP 07023797 A EP07023797 A EP 07023797A EP 1932960 B1 EP1932960 B1 EP 1932960B1
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EP
European Patent Office
Prior art keywords
water
conductance sensor
pump
surrounded
conductance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP07023797.9A
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German (de)
French (fr)
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EP1932960A3 (en
EP1932960A2 (en
Inventor
Rainer Münzner
Kay Schmidt
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.)
EGO Elektro Geratebau GmbH
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EGO Elektro Geratebau GmbH
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Publication of EP1932960A2 publication Critical patent/EP1932960A2/en
Publication of EP1932960A3 publication Critical patent/EP1932960A3/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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/087—Water level measuring or regulating devices
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/42—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of draining
    • 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
    • D06F2103/18—Washing liquid 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/20—Washing liquid condition, e.g. turbidity
    • 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
    • D06F2105/08—Draining of washing liquids
    • 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
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D06F2105/48—Drum speed
    • 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
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • 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
    • D06F34/22—Condition of the washing liquid, e.g. turbidity

Definitions

  • the invention relates to a method for controlling the operation of a washing machine, wherein a conductivity sensor is arranged in a tub of the washing machine (see DE-U-296 11 091 ). It is for example for controlling the operation of a washing machine from the DE 10 2005 007 935 A1 or the EP 633 342 A1 known to provide a conductivity sensor inside, for example, in the lower region of the tub.
  • the measured values of the conductivity sensor are recorded and evaluated by a controller of the washing machine.
  • the possibilities described therein of further processing or utilizing these measured values are limited.
  • the invention has for its object to provide an aforementioned method with which the functionality of a washing process or operating method of a washing machine or the evaluation of an aforementioned conductivity sensor can be improved.
  • the water level is detected by the conductivity sensor and, if the water level has dropped lower than the arrangement of the conductivity sensor, emptying of the tub is stopped, ie in particular pumping with a pump.
  • emptying of the pump can be prevented with completely empty pumped tub, which on the one hand avoids unnecessary energy consumption and on the other hand, especially in those phases in which the drum does not rotate, avoids unpleasant audible noise.
  • an aforementioned pump is provided for emptying the tub, which is why it is advantageous if the switching off of the pump takes place after the fall of the water level under the conductance only after a few seconds delay.
  • Such a delay is tuned to the fact that the water level at normal pumping power is lowered even further below the conductivity sensor, however, avoiding idling of the pump or a suction of air at the pump. This ensures that operation of the pump takes place close to an area which is considered optimal, ie emptying the tub or lowering the water level to just above the pump.
  • the pump can also be switched off when the water level is below it. It is important to be able to determine where the water level is relative to the pump to avoid possible noises.
  • the conductivity sensor is designed to detect during the washing process whether it is surrounded by foam is. In particular, this can be detected not only by the conductivity sensor itself, but also in cooperation with the control of the washing machine or a controller for the conductivity sensor. As a countermeasure to reduce or eliminate the foam, fresh water is added. Thus, the foam or the liquor is at least diluted and foam removed as possible. Detection of foam on the conductivity sensor is thus possible with good security within the scope of the invention. In the case of capacitive conductivity sensors in particular, measured values for this foam state at the conductivity sensor are between those for air and those in the event that the conductivity sensor is surrounded by water.
  • the spin speed only during the spin cycle, in particular with the pump always running, until the conductivity sensor is essentially surrounded by water without interruptions or even constantly. This means that it starts with slow spin speeds, since then with still very wet laundry sufficient water is ejected from the laundry, so that the water level exceeds the conductivity sensor. Since usually the pump capacity is limited or the pump always runs at maximum power, it makes little sense to spin the laundry even faster and throw out even more water, if this can then be removed by the pump in time or fast enough , Furthermore, then the laundry in the drum again and again through the Water are turned down in the tub and wet again, which should just be avoided.
  • the spin speed can then be increased slowly until the conductivity sensor is again surrounded predominantly or always by water. This can be repeated several times or the spin speed can be increased more and more. This slow increase of the spin speed unnecessarily early or fast spinning of the drum is avoided with the associated energy consumption and bearing wear.
  • a period of a few seconds is waited between a state change at the conductivity sensor, ie between the state of the predominantly surrounded by water and the state of the predominantly exposed Leitwertsensors, and a pump on or off, as already above has been described.
  • This time span can be, for example, in the range between 5 and 30 seconds, in particular between 10 and 20 seconds.
  • this short period of time is provided for the purpose of further pumping off water as the pump continues to run until shortly before the pump runs empty.
  • the pump is stopped and the water rises, it waits until the water level has risen a bit above the conductance sensor, but has not yet returned to the laundry. This reduces the switching frequency at the pump.
  • a washing or rinsing process in particular also a spinning process, in a method for operating an aforementioned conductivity sensor or in measuring the conductivity in the tub or in the liquor for carrying out the conductance measurement.
  • the drum is stopped until it comes to a standstill and then conductance measurement is carried out with the drum stationary. This avoids that the liquor is hit by the drum movement in the tub or beaten until foaming.
  • the water in the tub can calm down, which also allows a better and safer evaluation of the conductivity sensor.
  • a washing machine according to an embodiment of the invention is shown with a drum 13, in which laundry 14 is located.
  • the drum 13 is driven by the motor 15 with a belt drive.
  • a tub 17 is provided below the drum 13 and surrounds it and has an outlet 18.
  • This drain 18 leads to a pump 20, which conveys water from the tub 17 via a drain hose 21 from the washing machine 11.
  • a heater 23 to warm up therein water or fleet.
  • a feed for fresh water as well as for the detergent added water may be designed as in the prior art.
  • a Leitwertsensor 24 protrudes into the tub 17, in the illustrated embodiment, close to the heater 23, as for example from the DE 10 2005 007 935 is known.
  • the conductivity sensor 24 defines, so to speak, a level 25 shown in dashed lines, which marks the height up to which it can detect water or foam. This will be explained below discussed in more detail.
  • the conductivity sensor 24 is connected to a controller 26, which may additionally also be connected to the pump 20 and / or the heater 23, in particular for their control or also for the evaluation of their operating state.
  • the motor 15 may be connected to the controller 26, both of which are controlled by this and in addition or alternatively to detect its operating state as described above.
  • the conductance sensor 24 may determine whether water or foam is above or below the level 25, or whether it is immersed in water itself. This may be decisive, in particular, for the pumping operation described above.
  • the conductivity sensor 24 is located at the level 25 a whole distance below the lowest point of the drum 13. Thus, a water level, the conductivity sensor 24 and the level 25 exceed a good deal, without getting to the drum 13 and the laundry 14 therein and make them wet again.
  • Fig. 2 It is shown how to determine the surface tension of the liquor in which the contents of the drum 13, in particular the laundry 14, based on the surfactant concentration, can measure. Namely, there is a fixed relationship between these, from which in particular the controller 26 can draw the above conclusions.
  • the conductance and the surfactant concentration are related to each other as shown in FIG Fig. 3 is shown.
  • controller 26 advantageously forms the entire control for the washing machine 11, it knows the respective program sequence and, therefore, of course also knows whether a washing process or a rinsing process is currently taking place.
  • the exact nature of the particular surfactant present need not necessarily be known since, starting from a starting value for any desired surfactant, the change in concentration is recognizable. This is sufficient for the aforementioned optimization of the washing and rinsing operations.
  • different courses can be used accordingly Fig. 4 be stored in the controller 26 and used for detection.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Description

Anwendungsgebiet und Stand der TechnikField of application and state of the art

Die Erfindung betrifft ein Verfahren zum Steuern des Betriebs einer Waschmaschine, wobei in einem Laugenbehälter der Waschmaschine ein Leitwertsensor angeordnet ist (siehe DE-U-296 11 091 ). Es ist beispielsweise zum Steuern des Betriebs einer Waschmaschine aus der DE 10 2005 007 935 A1 oder der EP 633 342 A1 bekannt, einen Leitwertsensor im Inneren vorzusehen, beispielsweise im unteren Bereich des Laugenbehälters. Die Messwerte des Leitwertsensors werden erfasst und von einer Steuerung der Waschmaschine ausgewertet. Allerdings sind die darin beschriebenen Möglichkeiten, diese Messwerte weiter zu verarbeiten bzw. zu nutzen, beschränkt.The invention relates to a method for controlling the operation of a washing machine, wherein a conductivity sensor is arranged in a tub of the washing machine (see DE-U-296 11 091 ). It is for example for controlling the operation of a washing machine from the DE 10 2005 007 935 A1 or the EP 633 342 A1 known to provide a conductivity sensor inside, for example, in the lower region of the tub. The measured values of the conductivity sensor are recorded and evaluated by a controller of the washing machine. However, the possibilities described therein of further processing or utilizing these measured values are limited.

Aus der DE 296 11 091 U1 ist es bekannt, zum Steuern des Betriebs einer Waschmaschine ein Abpumpen zu stoppen, wenn sich der Wasserpegel unterhalb eines Leitwertsensors im Inneren befindet, wodurch der Leitwert ja zu Null wird. Weitere Maßnahmen gehen daraus jedoch nicht hervor.From the DE 296 11 091 U1 For controlling the operation of a washing machine, it is known to stop pumping when the water level is below a conductivity sensor in the interior, whereby the conductance is yes to zero. However, further measures are not apparent.

Aufgabe und LösungTask and solution

Der Erfindung liegt die Aufgabe zugrunde, ein eingangs genanntes Verfahren zu schaffen, mit dem die Funktionalität eines Waschverfahrens oder Betriebsverfahrens einer Waschmaschine bzw. die Auswertung eines vorgenannten Leitwertsensors verbessert werden kann.The invention has for its object to provide an aforementioned method with which the functionality of a washing process or operating method of a washing machine or the evaluation of an aforementioned conductivity sensor can be improved.

Gelöst wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1. Vorteilhafte sowie bevorzugte Ausgestaltungen der Erfindung sind Gegenstand der weiteren Ansprüche und werden im Folgenden näher erläutert. Es ist vor allem auch möglich, mehrere der erfindungsgemäßen Aspekte zu kombinieren. Der Wortlaut der Ansprüche wird durch ausdrückliche Bezugnahme zum Inhalt der Beschreibung gemacht.This object is achieved by a method having the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of the further claims and will become hereinafter explained in more detail. Above all, it is also possible to combine several aspects of the invention. The wording of the claims is incorporated herein by express reference.

Bei der Erfindung ist vorgesehen, dass durch den Leitwertsensor der Wasserstand erfasst wird und, falls der Wasserstand tiefer gefallen ist als die Anordnung des Leitwertsensors, ein Entleeren des Laugenbehälters gestoppt wird, also insbesondere ein Abpumpen mit einer Pumpe. Auf diese Art und Weise kann ein Leerlaufen der Pumpe bei vollständig leergepumptem Laugenbehälter verhindert werden, was einerseits einen unnötigen Energieverbrauch vermeidet und andererseits, gerade in solchen Phasen, in denen sich die Trommel nicht dreht, unangenehme hörbare Geräusche vermeidet.In the invention, it is provided that the water level is detected by the conductivity sensor and, if the water level has dropped lower than the arrangement of the conductivity sensor, emptying of the tub is stopped, ie in particular pumping with a pump. In this way, emptying of the pump can be prevented with completely empty pumped tub, which on the one hand avoids unnecessary energy consumption and on the other hand, especially in those phases in which the drum does not rotate, avoids unpleasant audible noise.

Dabei ist zum Entleeren des Laugenbehälters eine vorgenannte Pumpe vorgesehen, weswegen es vorteilhaft ist, wenn das Abschalten der Pumpe nach dem Fallen des Wasserstands unter den Leitwertsensor erst mit einigen Sekunden Verzögerung erfolgt. Eine derartige Verzögerung ist darauf abgestimmt, dass der Wasserstand bei normaler Pumpleistung zwar noch etwas weiter unterhalb den Leitwertsensor gesenkt wird, jedoch ein Leerlaufen der Pumpe bzw. ein Ansaugen von Luft an der Pumpe vermieden wird. So wird sichergestellt, dass ein Betrieb der Pumpe nahe an einem als optimal anzusehenden Bereich erfolgt, also ein Entleeren des Laugenbehälters bzw. Senken des Wasserstandes bis kurz oberhalb der Pumpe. Dies muss jedoch nicht unbedingt so sein, die Pumpe kann auch abgeschaltet werden, wenn sich der Wasserstand darunter befindet. Wichtig ist eben, dass festgestellt werden kann, wo der Wasserstand relativ zu der Pumpe ist um möglicherweise Geräusche zu vermeiden.In this case, an aforementioned pump is provided for emptying the tub, which is why it is advantageous if the switching off of the pump takes place after the fall of the water level under the conductance only after a few seconds delay. Such a delay is tuned to the fact that the water level at normal pumping power is lowered even further below the conductivity sensor, however, avoiding idling of the pump or a suction of air at the pump. This ensures that operation of the pump takes place close to an area which is considered optimal, ie emptying the tub or lowering the water level to just above the pump. However, this may not necessarily be so, the pump can also be switched off when the water level is below it. It is important to be able to determine where the water level is relative to the pump to avoid possible noises.

Gemäß einer Ausgestaltung der Erfindung ist der Leitwertsensor dazu ausgebildet, beim Waschvorgang zu erkennen, ob er von Schaum umgeben ist. Insbesondere kann dies nicht nur durch den Leitwertsensor selber erkannt werden, sondern auch im Zusammenwirken mit der Steuerung der Waschmaschine bzw. einer Steuerung für den Leitwertsensor. Als Gegenmaßnahme zur Reduzierung bzw. Beseitigung des Schaums wird Frischwasser zugegeben. So werden der Schaum bzw. die Flotte zumindest verdünnt und Schaum möglichst entfernt. Eine Erkennung von Schaum an dem Leitwertsensor ist so im Rahmen der Erfindung mit guter Sicherheit möglich. Insbesondere bei kapazitiven Leitwertsensoren liegen Messwerte für diesen Schaum-Zustand am Leitwertsensor zwischen solchen für Luft und solchen für den Fall, dass der Leitwertsensor von Wasser umgeben ist.According to one embodiment of the invention, the conductivity sensor is designed to detect during the washing process whether it is surrounded by foam is. In particular, this can be detected not only by the conductivity sensor itself, but also in cooperation with the control of the washing machine or a controller for the conductivity sensor. As a countermeasure to reduce or eliminate the foam, fresh water is added. Thus, the foam or the liquor is at least diluted and foam removed as possible. Detection of foam on the conductivity sensor is thus possible with good security within the scope of the invention. In the case of capacitive conductivity sensors in particular, measured values for this foam state at the conductivity sensor are between those for air and those in the event that the conductivity sensor is surrounded by water.

Hier ist es vorgesehen, als Gegenmaßnahme bei Schaum so viel bzw. so lange Frischwasser zuzugeben, bis auch während des Waschvorgangs bzw. während des Drehens der Trommel der Leitwertsensor überwiegend oder, besonders vorteilhaft, stets von Wasser umgeben ist. So können die negativen Auswirkungen von zuviel Schaum beim Waschen vermieden werden.Here, it is envisaged to add so much or so long fresh water as a countermeasure in foam until even during the washing process or during rotation of the drum of the conductivity sensor is predominantly or, particularly advantageous, always surrounded by water. Thus, the negative effects of too much foam during washing can be avoided.

Gemäß einer Ausgestaltung der Erfindung ist es möglich, beim Schleudervorgang, insbesondere bei stets mitlaufender Pumpe, die Schleuderdrehzahl nur so lange zu erhöhen, bis der Leitwertsensor im Wesentlichen ohne Unterbrechungen oder sogar ständig von Wasser umgeben ist. Dies bedeutet also, dass mit langsamen Schleuderdrehzahlen begonnen wird, da dann bei noch sehr nasser Wäsche ausreichend Wasser aus der Wäsche herausgeschleudert wird, so dass der Wasserstand den Leitwertsensor übersteigt. Da in der Regel die Pumpenleistung begrenzt ist bzw. die Pumpe stets mit maximaler Leistung läuft, macht es wenig Sinn, die Wäsche noch schneller zu schleudern und noch mehr Wasser herauszuschleudern, wenn dieses dann von der Pumpe nicht rechtzeitig bzw. schnell genug abtransportiert werden kann. Des Weiteren wird dann die Wäsche in der Trommel immer wieder durch das Wasser unten im Laugenbehälter durchgedreht werden und wieder feucht, was eben vermieden werden sollte.According to one embodiment of the invention, it is possible to increase the spin speed only during the spin cycle, in particular with the pump always running, until the conductivity sensor is essentially surrounded by water without interruptions or even constantly. This means that it starts with slow spin speeds, since then with still very wet laundry sufficient water is ejected from the laundry, so that the water level exceeds the conductivity sensor. Since usually the pump capacity is limited or the pump always runs at maximum power, it makes little sense to spin the laundry even faster and throw out even more water, if this can then be removed by the pump in time or fast enough , Furthermore, then the laundry in the drum again and again through the Water are turned down in the tub and wet again, which should just be avoided.

Vorteilhaft ist es zusätzlich möglich, die Schleuderdrehzahl erst dann zu erhöhen, wenn der Leitwertsensor nach einer längeren Zeit, insbesondere nach wenigen Minuten, während der er ständig oder ganz überwiegend von Wasser umgeben war, dann nicht mehr oder überwiegend nicht mehr von Wasser umgeben ist. Dies bedeutet nämlich, dass dann die Pumpe mit dem aus der Wäsche kommenden Wasser mithalten kann bzw. es entfernen kann und somit wieder stärker bzw. schneller geschleudert werden kann. Besonders bevorzugt kann dann die Schleuderdrehzahl langsam so lange erhöht werden, bis der Leitwertsensor erneut überwiegend oder stets von Wasser umgeben ist. Dies kann mehrfach wiederholt werden bzw. die Schleuderdrehzahl kann dabei immer weiter gesteigert werden. Durch dieses langsame Steigern der Schleuderdrehzahl wird unnötig frühes bzw. schnelles Schleudern der Trommel mit dem damit verbundenen Energieverbrauch und der Lagerabnutzung vermieden.Advantageously, it is additionally possible to increase the spin speed only when the conductivity sensor after a longer time, especially after a few minutes during which he was constantly or completely surrounded by water, then no longer or mostly no longer surrounded by water. This means that the pump can then keep up with the water coming out of the laundry or can remove it, and thus can be hurled harder or faster again. With particular preference, the spin speed can then be increased slowly until the conductivity sensor is again surrounded predominantly or always by water. This can be repeated several times or the spin speed can be increased more and more. This slow increase of the spin speed unnecessarily early or fast spinning of the drum is avoided with the associated energy consumption and bearing wear.

Es ist vorgesehen, über den Leitwertsensor bzw. dessen Messwerte den Betrieb der Pumpe zu steuern. Es ist beispielsweise möglich, bei Erreichen einer maximalen Schleuderdrehzahl die Pumpe dann abzuschalten, wenn der Leitwertsensor nicht mehr oder überwiegend nicht mehr von Wasser umgeben ist. Sie wird erst dann wieder angeschaltet, wenn der Leitwertsensor stets oder überwiegend von Wasser umgeben ist. So ist es möglich, dass die Pumpe bei maximaler Schleuderdrehzahl nicht ständig läuft. Das vorbeschriebene Leerlaufen der Pumpe mit Ansaugen von Luft ist zwar hinsichtlich der Geräuschbelästigung während des Schleuderns, insbesondere bei hohen Drehzahlen, nicht kritisch, da es viel leiser ist als das Schleudern. Es kann jedoch ein unnötiger Energieverbrauch und Verschleiß an der Pumpe reduziert werden.It is intended to control the operation of the pump via the conductivity sensor or its measured values. It is possible, for example, to switch off the pump when a maximum spin speed is reached when the conductivity sensor is no longer or predominantly no longer surrounded by water. It is only switched on again when the conductivity sensor is always or predominantly surrounded by water. So it is possible that the pump does not run constantly at maximum spin speed. The above-described emptying of the pump with suction of air is indeed in terms of noise nuisance during spin, especially at high speeds, not critical, since it is much quieter than the spin. However, unnecessary energy consumption and wear on the pump can be reduced.

Besonders vorteilhaft ist es möglich, dass zwischen einer Zustandsänderung am Leitwertsensor, also zwischen dem Zustand des überwiegend von Wasser umgebenen und dem Zustand des überwiegend freiliegenden Leitwertsensors, und einem An- oder Abschalten der Pumpe eine Zeitspanne von einigen Sekunden gewartet wird, wie dies vorstehend bereits beschrieben worden ist. Diese Zeitspanne kann beispielsweise im Bereich zwischen 5 und 30 Sekunden liegen, insbesondere zwischen 10 und 20 Sekunden. Wie bereits zuvor beschrieben ist auch hier diese kurze Zeitspanne dazu vorgesehen, dass beim Weiterlaufen der Pumpe noch weiter Wasser abgepumpt wird bis kurz vor ein Leerlaufen der Pumpe. Bei stillstehender Pumpe und ansteigendem Wasser wird gewartet, bis der Wasserstand ein Stück über den Leitwertsensor gestiegen ist, aber noch nicht wieder die Wäsche erreicht hat. So wird die Schalthäufigkeit an der Pumpe reduziert.Particularly advantageously, it is possible that a period of a few seconds is waited between a state change at the conductivity sensor, ie between the state of the predominantly surrounded by water and the state of the predominantly exposed Leitwertsensors, and a pump on or off, as already above has been described. This time span can be, for example, in the range between 5 and 30 seconds, in particular between 10 and 20 seconds. As already described above, this short period of time is provided for the purpose of further pumping off water as the pump continues to run until shortly before the pump runs empty. When the pump is stopped and the water rises, it waits until the water level has risen a bit above the conductance sensor, but has not yet returned to the laundry. This reduces the switching frequency at the pump.

Gemäß einer Ausgestaltung der Erfindung ist es möglich, bei einem Verfahren zum Betrieb eines vorgenannten Leitwertsensors bzw. bei der Messung der Leitfähigkeit in dem Laugenbehälter bzw. in der Flotte einen Wasch- oder Spülprozess, insbesondere auch einen Schleuderprozess, kurz zu unterbrechen für die Durchführung der Leitwertmessung. Insbesondere wird bei einer Unterbrechung bzw. für die Leitwertmessung die Trommel gestoppt bis zum Stillstand und dann die Leitwertmessung bei still stehender Trommel durchgeführt. Dadurch wird vermieden, dass die Flotte durch die Trommelbewegung im Laugenbehälter aufgeschlagen bzw. bis zum Schäumen geschlagen wird. Des Weiteren kann sich dann das Wasser in dem Laugenbehälter beruhigen, was ebenfalls eine bessere und sicherere Auswertung des Leitwertsensors ermöglicht.According to one embodiment of the invention, it is possible to briefly interrupt a washing or rinsing process, in particular also a spinning process, in a method for operating an aforementioned conductivity sensor or in measuring the conductivity in the tub or in the liquor for carrying out the conductance measurement. In particular, in the case of an interruption or for the conductance measurement, the drum is stopped until it comes to a standstill and then conductance measurement is carried out with the drum stationary. This avoids that the liquor is hit by the drum movement in the tub or beaten until foaming. Furthermore, the water in the tub can calm down, which also allows a better and safer evaluation of the conductivity sensor.

Weiterhin ist es im Rahmen der Erfindung möglich, dass eine von normalerweise zwei vorgeschriebenen Sicherheitsschaltungen für die Heizung entfällt, da mit dem Leitwertsensor im Rahmen der vorbeschriebenen Wasserstandsmessung bestimmt werden kann, ob sich die Heizung im Wasser befindet. Dies ermöglicht einen einfacheren Aufbau einer Waschmaschine.Furthermore, it is possible within the scope of the invention that one of normally two prescribed safety circuits for the heating is eliminated, since it can be determined with the conductivity sensor in the context of the above-described water level measurement, whether the heating in the water. This allows a simpler construction of a washing machine.

Diese und weitere Merkmale gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung verwirklicht sein können. Die Unterteilung der Anmeldung in einzelne Abschnitte sowie Zwischen-Überschriften beschränken die unter diesen gemachten Aussagen nicht in ihrer Allgemeingültigkeit.These and other features are apparent from the claims and from the description and drawings, wherein the individual features may be realized alone or in each case in the form of sub-combinations in an embodiment of the invention. The subdivision of the application into individual sections as well as intermediate headings does not restrict the general validity of the statements made thereunder.

Kurzbeschreibung der ZeichnungenBrief description of the drawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen schematisch dargestellt und werden im Folgenden näher erläutert. Hierbei zeigen:

Fig. 1
eine schematische Innenansicht einer erfindungsgemäßen Waschmaschine und
Fig. 2 bis 4
verschiedene Diagramme zur Darstellung der Zusammenhänge zwischen Tensidkonzentration, Oberflächenspannung und Leitwert.
Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. Hereby show:
Fig. 1
a schematic interior view of a washing machine according to the invention and
Fig. 2 to 4
various diagrams to illustrate the relationships between surfactant concentration, surface tension and conductance.

Detaillierte Beschreibung der AusführungsbeispieleDetailed description of the embodiments

In Fig. 1 ist eine Waschmaschine gemäß einem Ausführungsbeispiel der Erfindung dargestellt mit einer Trommel 13, in der sich Wäsche 14 befindet. Angetrieben wird die Trommel 13 durch den Motor 15 mit einem Riemenantrieb. Ein Laugenbehälter 17 ist unterhalb der Trommel 13 vorgesehen bzw. umgibt sie und weist einen Abfluss 18 auf. Dieser Abfluss 18 führt zu einer Pumpe 20, welche Wasser aus dem Laugenbehälter 17 über einen Abflussschlauch 21 aus der Waschmaschine 11 befördert. In den Laugenbehälter 17 ragt eine Heizung 23, um darin befindliches Wasser bzw. Flotte aufzuwärmen. Nicht dargestellt ist in Fig. 1 ein Zulauf für Frischwasser sowie für mit dem Waschmittel versetztes Wasser. Dies kann jedoch, ebenso wie die bis zu diesem Punkt beschriebene Waschmaschine, so ausgebildet sein wie im Stand der Technik.In Fig. 1 a washing machine according to an embodiment of the invention is shown with a drum 13, in which laundry 14 is located. The drum 13 is driven by the motor 15 with a belt drive. A tub 17 is provided below the drum 13 and surrounds it and has an outlet 18. This drain 18 leads to a pump 20, which conveys water from the tub 17 via a drain hose 21 from the washing machine 11. In the tub 17 protrudes a heater 23 to warm up therein water or fleet. Not shown in Fig. 1 a feed for fresh water as well as for the detergent added water. However, this, as well as the washing machine described up to this point, may be designed as in the prior art.

Ein Leitwertsensor 24 ragt in den Laugenbehälter 17, im dargestellten Ausführungsbeispiel nahe der Heizung 23, wie dies beispielsweise aus der DE 10 2005 007 935 bekannt ist. Der Leitwertsensor 24 definiert sozusagen einen gestrichelt dargestellten Pegel 25, der die Höhe markiert, bis zu der er Wasser oder Schaum erkennen kann. Hierauf wird nachfolgend noch näher eingegangen. Des Weiteren ist der Leitwertsensor 24 mit einer Steuerung 26 verbunden, welche zusätzlich auch noch mit der Pumpe 20 und/oder der Heizung 23 verbunden sein kann, insbesondere zu deren Ansteuerung bzw. auch zu der Auswertung von deren Betriebszustand. Ebenso kann der Motor 15 mit der Steuerung 26 verbunden sein, und zwar sowohl von dieser angesteuert werden als auch zusätzlich oder alternativ zur Erkennung seines Betriebszustandes wie eingangs beschrieben.A Leitwertsensor 24 protrudes into the tub 17, in the illustrated embodiment, close to the heater 23, as for example from the DE 10 2005 007 935 is known. The conductivity sensor 24 defines, so to speak, a level 25 shown in dashed lines, which marks the height up to which it can detect water or foam. This will be explained below discussed in more detail. Furthermore, the conductivity sensor 24 is connected to a controller 26, which may additionally also be connected to the pump 20 and / or the heater 23, in particular for their control or also for the evaluation of their operating state. Likewise, the motor 15 may be connected to the controller 26, both of which are controlled by this and in addition or alternatively to detect its operating state as described above.

Wie zuvor beschrieben ist, kann der Leitwertsensor 24 beispielsweise feststellen, ob Wasser oder Schaum oberhalb oder unterhalb des Pegels 25 ist bzw. ob er selber in Wasser eingetaucht ist. Dies kann insbesondere für den vorbeschriebenen Pumpbetrieb ausschlaggebend sein. In diesem Zusammenhang ist auch zu bemerken, dass der Leitwertsensor 24 mit dem Pegel 25 ein ganzes Stück unterhalb des untersten Punktes der Trommel 13 sitzt. Somit kann ein Wasserspiegel den Leitwertsensor 24 bzw. den Pegel 25 ein gutes Stück übersteigen, ohne dabei an die Trommel 13 sowie die darin befindliche Wäsche 14 zu gelangen und diese wieder feucht zu machen. Diese Höhendifferenz ist bei der zuvor beschriebenen, einem Hysterese-Verlauf ähnlichen Möglichkeit zu beachten, bei Übersteigen des Wassers über den Pegel 25 die Pumpe 20 erst nach einer bestimmten Zeit anzuschalten, auf alle Fälle aber noch rechtzeitig, bevor das Wasser an die Trommel 13 gelangt. Ähnliches gilt für das Absinken des Wassers unter den Pegel 25, bevor die Pumpe 20 trocken läuft beim Abpumpen.For example, as previously described, the conductance sensor 24 may determine whether water or foam is above or below the level 25, or whether it is immersed in water itself. This may be decisive, in particular, for the pumping operation described above. In this context, it should also be noted that the conductivity sensor 24 is located at the level 25 a whole distance below the lowest point of the drum 13. Thus, a water level, the conductivity sensor 24 and the level 25 exceed a good deal, without getting to the drum 13 and the laundry 14 therein and make them wet again. This height difference is observed in the previously described, a hysteresis-like possibility similar to turn on the water above the level 25, the pump 20 after a certain time, in any case, in good time before the water reaches the drum 13 , The same applies to the drop in water below the level 25 before the pump 20 runs dry when pumping.

Da die verschiedenen möglichen Verfahren eingangs bereits beschrieben worden sind, braucht hier nicht noch einmal näher darauf eingegangen zu werden, sie werden im Zusammenhang mit der Fig. 1 jedoch noch klarer.Since the various possible methods have already been described at the outset, there is no need to go back even further here to discuss them in connection with the Fig. 1 but even clearer.

In Fig. 2 ist dargestellt, wie man die Oberflächenspannung der Flotte, in der sich der Inhalt der Trommel 13 befindet, insbesondere die Wäsche 14, bezogen auf die Tensidkonzentration, messen kann. Dabei besteht nämlich ein fester Zusammenhang zwischen diesen, aus dem insbesondere die Steuerung 26 die genannten Rückschlüsse ziehen kann.In Fig. 2 It is shown how to determine the surface tension of the liquor in which the contents of the drum 13, in particular the laundry 14, based on the surfactant concentration, can measure. Namely, there is a fixed relationship between these, from which in particular the controller 26 can draw the above conclusions.

In ähnlicher Form stehen der Leitwert und die Tensidkonzentration in einem festen Zusammenhang zueinander, wie dies in Fig. 3 gezeigt ist. Schließlich kann man auch gemäß Fig. 4 den Leitwert in Zusammenhang zur Oberflächenspannung in der Flotte in der Trommel 13 bzw. in dem Laugenbehälter 17 setzen. Dann erhält man für unterschiedliche Tenside und unterschiedliche Tensidkonzentrationsbereiche jeweils nahezu lineare Zusammenhänge, nämlich die in Fig. 4 dargestellten Bereiche 1 bis 4. Ist nun der Bereich der Tensidkonzentration bekannt, z.B. eine sehr hohe Tensidkonzentration beim Waschvorgang, so kann aus der Leitfähigkeit der Flotte anhand des Leitwerts auf die Tensidkonzentration geschlossen werden. Ist die Tensidkonzentration eher niedrig, beispielsweise beim Spülen von Wäsche 14 in der Trommel 13, kann der Leitwert ebenfalls aus dem festen Zusammenhang ermittelt werden. Da die Steuerung 26 vorteilhaft die gesamte Steuerung für die Waschmaschine 11 bildet, kennt sie den jeweiligen Programmablauf und weiß deswegen natürlich auch, ob gerade ein Waschvorgang oder ein Spülvorgang läuft. Die genaue Art des jeweils vorhandenen Tensids muss nicht zwingend bekannt sein, da ausgehend von einem Startwert bei beliebigem Tensid die Konzentrationsänderung erkennbar ist. Dies ist für die vorgenannte Optimierung der Wasch- und Spülvorgänge ausreichend. Insbesondere können verschiedene Verläufe entsprechend Fig. 4 in der Steuerung 26 abgespeichert sein und zur Erkennung herangezogen werden.Similarly, the conductance and the surfactant concentration are related to each other as shown in FIG Fig. 3 is shown. Finally, you can also according Fig. 4 set the conductance in relation to the surface tension in the liquor in the drum 13 or in the tub 17. Then one obtains for different surfactants and different Tensidkonzentrationsbereiche each nearly linear relationships, namely the in Fig. 4 If the range of the surfactant concentration is known, for example a very high surfactant concentration during the washing process, the liquor conductivity can be deduced from the conductance on the surfactant concentration. If the surfactant concentration is rather low, for example when rinsing laundry 14 in the drum 13, the conductance can also be determined from the fixed relationship. Since the controller 26 advantageously forms the entire control for the washing machine 11, it knows the respective program sequence and, therefore, of course also knows whether a washing process or a rinsing process is currently taking place. The exact nature of the particular surfactant present need not necessarily be known since, starting from a starting value for any desired surfactant, the change in concentration is recognizable. This is sufficient for the aforementioned optimization of the washing and rinsing operations. In particular, different courses can be used accordingly Fig. 4 be stored in the controller 26 and used for detection.

Claims (7)

  1. Method for controlling operation of a washing machine (11), with a conductance sensor (24) being located in a lower area of the washing liquid container (17) and measured values of said conductance sensor (24) are detected and supplied to a control unit (26) of the washing machine (11), wherein it is detected when the water level has dropped lower than a position (25) of said conductance sensor (24) and in response thereof an emptying procedure of said washing liquid container (17) is stopped, characterized in that a pump (20) is provided for emptying said washing liquid container (17) and switching-off of said pump (20) takes place with a few seconds delay, wherein said delay is matched in order to lower said water level even further below the conductance sensor (24) without bringing about an idle running of said pump (20) or an intake of air.
  2. Method according to claim 1, characterized in that during a washing process said conductance sensor (24) detects whether it is surrounded by foam, and fresh water is added as a countermeasure for diluting said foam or the washing liquid in said washing machine (11), wherein sufficient fresh water is added to ensure that even during said washing process or during rotating of the drum (13) said conductance sensor (24) is predominantly or always surrounded by water.
  3. Method according to claim 1 or 2, characterized in that during a spin drying process, in particular with continuously running pump (20), the spin drying speed is increased for the time being until said conductance sensor (24) is constantly surrounded by water, wherein by means of said conductance sensor (24) or its measured values said pumping operation is controlled, wherein on reaching a maximum of said spin drying speed said pump (20) is switched off when said conductance sensor (24) is no longer surrounded by water and is only switched on again when said conductance sensor (24) is surrounded by water.
  4. Method according to claim 3, characterized in that the spin drying speed is increased not earlier than when after a long period of time, in particular a few minutes, during which said conductance sensor (24) was surrounded by water, said conductance sensor (24) is then no longer surrounded by water, wherein preferably the spin drying speed is slowly increased until said conductance sensor (24) is again predominantly or always surrounded by water.
  5. Method according to claim 3 or 4, characterized in that between a change of function at said conductance sensor (24) and a switching on or off of said pump (20), there is a time interval of a few seconds, in particular of 5 to 20 seconds.
  6. Method according to any of the preceding claims, characterized in that a washing or rinsing process is briefly interrupted for performing a conductance measurement.
  7. Method according to claim 6, characterized in that for interruption purposes said drum (13) is stopped and then said conductance measurement is performed with said drum (13) stopped.
EP07023797.9A 2006-12-14 2007-12-07 Method for controlling a washing machine Not-in-force EP1932960B1 (en)

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DE102006060256A DE102006060256A1 (en) 2006-12-14 2006-12-14 Method for controlling a washing machine

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RU2007146118A (en) 2009-06-20
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DE102006060256A1 (en) 2008-06-26
EP1932960A3 (en) 2010-09-15
CN101220551A (en) 2008-07-16
ES2628041T3 (en) 2017-08-01
US20080141465A1 (en) 2008-06-19
EP1932960A2 (en) 2008-06-18
JP5043619B2 (en) 2012-10-10

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