EP2785904B1 - Method for operating a washing machine having an improved spin cycle - Google Patents

Method for operating a washing machine having an improved spin cycle Download PDF

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Publication number
EP2785904B1
EP2785904B1 EP12791758.1A EP12791758A EP2785904B1 EP 2785904 B1 EP2785904 B1 EP 2785904B1 EP 12791758 A EP12791758 A EP 12791758A EP 2785904 B1 EP2785904 B1 EP 2785904B1
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EP
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Prior art keywords
laundry
distribution
time
drum
spin
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EP12791758.1A
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German (de)
French (fr)
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EP2785904A1 (en
Inventor
Antje Rahfoth
Wolfram SCHUBERT
Jörg SKRIPPEK
Sven Vogel
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Priority to PL12791758T priority Critical patent/PL2785904T3/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
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/007—Methods for washing, rinsing or spin-drying for spin-drying only

Definitions

  • the invention relates to a method of operating a washing machine with an improved spin phase, ie a method for controlling a spin phase in a washing machine and a washing machine suitable for this purpose. More particularly, the invention relates to a method for controlling a spin phase with multiple spin stages in a laundry treatment process in a washing machine with a drum rotatably mounted in a tub around a substantially horizontal axis and program control, in which process in the spin phase prior to each spin step in a laundry dispensing step Distribution of the laundry items in an interior of the drum is made by increasing and / or decreasing a rotational speed of the drum, wherein for the laundry distribution step n before the centrifuging step n a maximum distribution time t max n or / and a maximum number m tr n of distribution tests for the Reaching or falling below a maximum value D max 1 of an acceptable uneven distribution of the laundry items is predetermined.
  • the treatment of laundry in a washing machine includes several treatment steps (wetting phase, pre-wash, main wash, rinse). After the main wash in the rinsing phase, the laundry still containing wash liquor and dirt residues is rinsed several times in the drum, wherein after the main wash and between the rinsing steps in each case is thrown. Subsequently, a final spin is performed, which has the goal that the residual moisture content of the laundry is as low as possible, so that a subsequent drying can proceed quickly and with the lowest possible energy consumption. For this purpose, a rotation number of the drum during the final spin is as high as possible.
  • laundry installation speed means a speed at which the laundry pieces have a centrifugal force greater than the gravitational force.
  • the laundry installation speed depends on the loading of the drum with laundry items. By a suitable selection of a speed can thus be specifically solved a certain proportion of the laundry items from the drum inner wall. The dissolved items of laundry can then be redistributed at the next increase in speed then on the drum inner wall.
  • a drum prior to the transition to a spin phase, a drum is generally accelerated for a predetermined period of time t set via a slow laundry dispensing phase or a laundry dispensing operation and an unbalance estimated which should be as low as possible during the spin phase.
  • the estimation of the unbalance usually takes place via the determination of an engine speed, a loading of the drum and an electrical power.
  • a position of the imbalance in the drum is first determined, which can be done at a laundry installation speed. Subsequently, the drum is accelerated or decelerated depending on the detected position of the unbalance of the drum, whereby the laundry items are redistributed in the drum.
  • the DE 196 16 985 A1 describes a method for compensating an imbalance occurring during the spinning of laundry items in a drum of a washing machine, in which, depending on a detected unbalance, a compensating liquid is introduced into cavities lying substantially in one plane on the drum side.
  • the DE 10 2008 055 091 A1 describes a method for operating a domestic appliance for the care of laundry, in which prior to a transition to a spin operation in a laundry distribution operation, a distribution of the laundry items in an interior of a drum of the household appliance by increasing and / or decreasing a rotational speed of the drum is made.
  • a so-called stability S a degree of concern of the items of laundry on an inner wall of the drum is determined as a function of a measured and / or control variable W, and increasing, lowering and / or maintaining the speed as a function of the degree of concern of the items of laundry.
  • the publication EP 16 93 498 A2 shows a method for controlling a spin speed of a washing machine.
  • the publication WO 2008/075987 A2 shows a method of operating a washing machine, wherein a spin speed is adjusted depending on a detected imbalance.
  • a laundry treatment program For optimum distribution of the laundry items prior to the actual spin, a laundry treatment program generally provides a fixed time and / or a number of attempts to achieve a predetermined upper limit for acceptable unbalance through non-uniform laundry distribution.
  • the object of the present invention was to provide a method for operating a washing machine, in which a spin phase can be optimally designed with regard to the time and efficiency required for this purpose.
  • a method should allow controlling a spin phase in a washing machine, whereby a spin phase can be provided with a balanced ratio of acceptable unbalance and time duration.
  • the object underlying the invention is achieved by a method for operating a washing machine for the treatment of laundry items and a suitable washing machine according to the independent claims.
  • Preferred embodiments of the invention are listed in the respective dependent claims.
  • Preferred embodiments of the method correspond to preferred embodiments of the washing machine, even if not separately pointed out here in each case.
  • the predetermined time t set n comprises the predetermined time for the laundry distribution step per se, but also the time that results when indicating a number of permissible partial washing attempts by means of a period of time.
  • the maximum value D max 1 of an acceptable uneven distribution of the laundry items is a maximum acceptable unbalance UN max 1 .
  • the imbalance can be determined in very different ways.
  • a motor current and / or an engine power and / or an engine energy and / or a deflection of a tub from a rest position a drum speed and / or a speed can be considered.
  • the unbalance is preferably determined based on a speed variation of the drum and / or a deflection of the tub.
  • the imbalance can be determined particularly reliably and accurately by means of the deflection of the tub, because a prediction of the imbalance from the speed fluctuation depends less strongly on the loading of the drum with laundry.
  • an imbalance of the drum caused by the laundry items is determined at a time at which the laundry items substantially completely abut the inner wall of the drum.
  • the degree of concern of the laundry items on the inner wall of the drum which can be referred to as a stability of a distribution of the laundry items in the interior of the drum, are used.
  • a stability of a distribution of the laundry items in the interior of the drum is described.
  • a user of the washing machine in the event of the presence of a difference .DELTA.t n is greater than 0 offered a choice to design the further spin-extraction phase in terms of a minimum temporal duration or an achievable minimum of residual moisture.
  • a user of the washing machine can make a selection even before the beginning of a laundry treatment step.
  • a user may also make such a selection about the further design of the spin phase during a laundry treatment program, eg when the user is informed about the presence of a difference ⁇ t n greater than 0.
  • the spin phase is shortened in time with a difference ⁇ t n greater than zero.
  • a part of the time difference is at least .DELTA.t n is greater than 0 to the predetermined time credits for the next Wäscheverteil Colour set time period t n + 1 is added.
  • x preferably lies in the range from 0.2 to 0.4 and y in the range from 0.6 to 0.8.
  • x may be equal to 0.3 and y may be equal to 0.7.
  • the time difference .DELTA.t n are summed up and the formed total period t max for the temporal extension of the duration t n of the set used last Wäscheverteil suitses before the final spin.
  • a time difference ⁇ t n greater than 0 is present on a display device of the washing machine, the presence of a good distribution of the laundry items in the drum is indicated.
  • the display device may be, for example, an optical or an acoustic display device.
  • a time difference ⁇ t n less than 0 is present on a display device of the washing machine, the presence of a poor distribution of the laundry items in the drum can be indicated. It may be also advantageously provided that in case of multiple presence of a time difference .DELTA.t n is less than 0, the spinning is stopped. Thus, such a situation can be displayed to a user of the laundry machine, who can then take appropriate countermeasures. For example, the loading of the drum with laundry items can be reduced or their arrangement in the drum can be influenced manually.
  • the washing machine of the present invention is a washing machine in the strict sense or a washer-dryer.
  • the term washing machine is used for both devices.
  • a washing machine generally has means for detecting uneven distribution of the laundry items in the drum.
  • a washing machine may have a travel sensor which is able to detect a deflection of the tub from a rest position and to generate a signal characteristic of this deflection.
  • the invention has the advantage that a spin phase can be optimally controlled. If less time is required in a laundry distribution step than intended, the resulting time credit can be used for further laundry distribution steps. Overall, this increases the probability that a good laundry distribution, in particular a laundry distribution with a small laundry imbalance is achieved. This allows in turn that a spin in the washing machine can be advantageously carried out with particularly high drum speeds. This leads to a reduced residual moisture of the laundry. Thus, the requirements for the label claim for the speed and residual moisture can be achieved particularly well. Finally, as a result of an improved spin method, it is also achieved that detergent residues are expelled particularly well. This is especially important for sensitive people who are sensitive to detergent residues in clothing. So a so-called "allergy program" could be carried out. Finally, due to the reduced imbalance, a tendency of the wash liquor to form foam is also reduced. In embodiments of the invention also a very short program duration can be achieved.
  • the method according to the invention also makes it possible to operate a washing machine with reduced centrifugal noise.
  • the presence of a time credit is an indication that a laundry distribution strategy in the washing machine is optimal.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Description

Die Erfindung betrifft ein Verfahren Betrieb einer Waschmaschine mit einer verbesserten Schleuderphase, d.h. ein Verfahren zum Steuern einer Schleuderphase in einer Waschmaschine sowie eine hierfür geeignete Waschmaschine. Insbesondere betrifft die Erfindung ein Verfahren zum Steuern einer Schleuderphase mit mehreren Schleuderschritten in einem Wäschebehandlungsverfahren in einer Waschmaschine mit einer in einem Laugenbehälter um eine im Wesentlichen horizontale Achse drehbar gelagerten Trommel und einer Programmsteuerung, bei welchem Verfahren in der Schleuderphase vor jedem Schleuderschritt in einem Wäscheverteilschritt eine Verteilung der Wäschestücke in einem Innenraum der Trommel durch ein Erhöhen und/oder Senken einer Drehzahl der Trommel vorgenommen wird, wobei für den Wäscheverteilschritt n vor dem Schleuderschritt n eine maximale Verteilzeit tmax n oder/und eine maximale Anzahl mtr n an Verteilversuchen für das Erreichen oder Unterschreiten eines maximalen Wertes Dmax 1 einer akzeptablen ungleichmäßigen Verteilung der Wäschestücke vorgegeben ist.The invention relates to a method of operating a washing machine with an improved spin phase, ie a method for controlling a spin phase in a washing machine and a washing machine suitable for this purpose. More particularly, the invention relates to a method for controlling a spin phase with multiple spin stages in a laundry treatment process in a washing machine with a drum rotatably mounted in a tub around a substantially horizontal axis and program control, in which process in the spin phase prior to each spin step in a laundry dispensing step Distribution of the laundry items in an interior of the drum is made by increasing and / or decreasing a rotational speed of the drum, wherein for the laundry distribution step n before the centrifuging step n a maximum distribution time t max n or / and a maximum number m tr n of distribution tests for the Reaching or falling below a maximum value D max 1 of an acceptable uneven distribution of the laundry items is predetermined.

Die Behandlung von Wäsche in einer Waschmaschine umfasst mehrere Behandlungsschritte (Benetzungsphase, Vorwäsche, Hauptwäsche, Spülen). Nach der Hauptwäsche in der Spülphase wird die noch Waschlauge und Schmutzreste enthaltende Wäsche in der Trommel mehrfach gespült, wobei nach der Hauptwäsche und zwischen den Spülschritten jeweils geschleudert wird. Anschließend wird ein Endschleudern durchgeführt, welches zum Ziel hat, dass die Restfeuchte der Wäsche möglichst gering ist, damit eine anschließende Trocknung rasch und mit möglichst geringem Energieverbrauch ablaufen kann. Hierzu ist eine Rotationszahl der Trommel beim Endschleudern möglichst hoch.The treatment of laundry in a washing machine includes several treatment steps (wetting phase, pre-wash, main wash, rinse). After the main wash in the rinsing phase, the laundry still containing wash liquor and dirt residues is rinsed several times in the drum, wherein after the main wash and between the rinsing steps in each case is thrown. Subsequently, a final spin is performed, which has the goal that the residual moisture content of the laundry is as low as possible, so that a subsequent drying can proceed quickly and with the lowest possible energy consumption. For this purpose, a rotation number of the drum during the final spin is as high as possible.

Beim Schleudern dreht sich die Trommel der Waschmaschine mit einer sehr hohen Drehzahl, beispielsweise 1.200 Umdrehungen/min. Dabei liegen die Wäschestücke fest an einer Innenwand der Trommel. Sind diese Wäschestücke aber an der Innenwand der Trommel ungleichmäßig verteilt, liegt eine Unwucht vor. Die Trommel gerät in Schwingungen, welche auch die mit der Trommel verbundenen Teile wie Laugenbehälter und Motor erfasst. Diese Schwingungen können sehr stark werden, so dass die Trommel nicht auf die zur Erzielung eines gewünschten Schleuderergebnisses vorgegebene Soll-Drehzahl hochgefahren werden kann.When spinning the drum of the washing machine rotates at a very high speed, for example, 1,200 revolutions / min. The laundry items are firmly attached to an inner wall of the drum. If these items of laundry but unevenly distributed on the inner wall of the drum, there is an imbalance. The drum comes into vibration, which also connected to the drum parts such as tubs and Engine detected. These vibrations can be very strong, so that the drum can not be raised to the predetermined speed to achieve a desired spin result.

Es ist daher erwünscht, die in einer Schleuderphase der Trommel durch eine ungleichmäßige Verteilung der Wäschestücke an der Innenwand der Trommel bewirkte Unwucht zu reduzieren. Die Verteilung der Wäschestücke kann in einem Bereich einer Wäscheanlagedrehzahl bekanntlich durch gezieltes Erhöhen bzw. Senken der Drehzahl der Trommel beeinflusst werden. Hierbei bedeutet "Wäscheanlagedrehzahl" eine Drehzahl, bei welcher auf die Wäschestücke eine Zentrifugalkraft wirkt, die größer als die Gravitationskraft ist.It is therefore desirable to reduce the imbalance caused in a spin phase of the drum by an uneven distribution of the laundry on the inner wall of the drum. The distribution of the laundry items can be influenced in a range of a laundry installation speed, as known, by specifically increasing or decreasing the rotational speed of the drum. Here, "laundry installation speed" means a speed at which the laundry pieces have a centrifugal force greater than the gravitational force.

Die Wäscheanlagedrehzahl hängt von der Beladung der Trommel mit Wäschestücken ab. Durch eine geeignete Auswahl einer Drehzahl kann somit gezielt ein bestimmter Anteil der Wäschestücke von der Trommelinnenwand gelöst werden. Die gelösten Wäschestücke können sich dann anschließend beim nächsten Erhöhen der Drehzahl neu an der Trommelinnenwand verteilen.The laundry installation speed depends on the loading of the drum with laundry items. By a suitable selection of a speed can thus be specifically solved a certain proportion of the laundry items from the drum inner wall. The dissolved items of laundry can then be redistributed at the next increase in speed then on the drum inner wall.

Außerdem ist es bekannt, in Abhängigkeit von einer Position der Unwucht gezielt die Drehzahl herauf- oder herabzusetzen.In addition, it is known, depending on a position of the imbalance targeted increase or decrease the speed.

Vor dem Übergang in eine Schleuderphase wird eine Trommel daher im Allgemeinen während eines vorgegebenen Zeitraums tset über eine langsame Wäscheverteilphase bzw. einen Wäscheverteilbetrieb beschleunigt und eine Unwucht abgeschätzt, die während der Schleuderphase möglichst gering sein sollte. Dabei erfolgt die Abschätzung der Unwucht üblicherweise über die Ermittlung einer Motordrehzahl, einer Beladung der Trommel und einer elektrischen Leistung.Therefore, prior to the transition to a spin phase, a drum is generally accelerated for a predetermined period of time t set via a slow laundry dispensing phase or a laundry dispensing operation and an unbalance estimated which should be as low as possible during the spin phase. In this case, the estimation of the unbalance usually takes place via the determination of an engine speed, a loading of the drum and an electrical power.

Es sind im Stand der Technik mehrere Verfahren bekannt, mit denen eine Unwucht einer mit Wäschestücken beladenen Trommel gemessen und reduziert wird, um eine Schleuderphase zu beeinflussen.Several methods are known in the prior art with which an imbalance of a laundry-loaded drum is measured and reduced in order to influence a spin phase.

Gemäß der DE 197 53 382 A1 wird hierzu zunächst eine Position der Unwucht in der Trommel bestimmt, was bei einer Wäscheanlagedrehzahl erfolgen kann. Anschließend wird die Trommel in Abhängigkeit von der ermittelten Position der Unwucht der Trommel beschleunigt oder abgebremst, wodurch die Wäschestücke in der Trommel neu verteilt werden.According to the DE 197 53 382 A1 For this purpose, a position of the imbalance in the drum is first determined, which can be done at a laundry installation speed. Subsequently, the drum is accelerated or decelerated depending on the detected position of the unbalance of the drum, whereby the laundry items are redistributed in the drum.

Die DE 196 16 985 A1 beschreibt ein Verfahren zum Ausgleichen einer beim Schleudern von Wäschestücken in einer Trommel einer Waschmaschine auftretenden Unwucht, bei dem abhängig von einer festgestellten Unwucht eine Ausgleichsflüssigkeit in trommelseitig im Wesentlichen in einer Ebene liegende Hohlräume eingebracht wird.The DE 196 16 985 A1 describes a method for compensating an imbalance occurring during the spinning of laundry items in a drum of a washing machine, in which, depending on a detected unbalance, a compensating liquid is introduced into cavities lying substantially in one plane on the drum side.

Die DE 10 2008 055 091 A1 beschreibt ein Verfahren zum Betreiben eines Haushaltgeräts zur Pflege von Wäschestücken, bei welchem vor einem Übergang in einen Schleuderbetrieb in einem Wäscheverteilbetrieb eine Verteilung der Wäschestücke in einem Innenraum einer Trommel des Haushaltgeräts durch ein Erhöhen und/oder Senken einer Drehzahl der Trommel vorgenommen wird. Hierbei wird als sogenannte Stabilität S ein Grad eines Anliegens der Wäschestücke an einer Innenwand der Trommel in Abhängigkeit einer Mess- und/oder Steuergröße W ermittelt und ein Erhöhen, Senken und/oder Halten der Drehzahl in Abhängigkeit vom Grad des Anliegens der Wäschestücke vorgenommen.The DE 10 2008 055 091 A1 describes a method for operating a domestic appliance for the care of laundry, in which prior to a transition to a spin operation in a laundry distribution operation, a distribution of the laundry items in an interior of a drum of the household appliance by increasing and / or decreasing a rotational speed of the drum is made. In this case, as a so-called stability S, a degree of concern of the items of laundry on an inner wall of the drum is determined as a function of a measured and / or control variable W, and increasing, lowering and / or maintaining the speed as a function of the degree of concern of the items of laundry.

In der DE 696 22 067 T3 ist ein Verfahren zum Auswuchten in einer Wäschewasch- und/oder -trocknermaschine sowie eine Maschine zum Durchführen dieses Verfahrens beschrieben. Hierzu wird in einer Anfangsdrehphase eine Trommel bei einer ersten Drehzahl gedreht, die ein weitgehendes Anhaften der Kleidungsstücke an den Trommelwänden bewirkt, und in einer Erfassungsphase der Gleichgewichtszustand während dieser Anfangsphase ermittelt. Ausgleichsmaßnahmen werden dann durch die Beladung selbst bereitgestellt. Bei diesen Maßnahmen wird die Reduktion der Trommelzahl von einer ersten Drehzahl (90 U/min) auf eine vorbestimmte zweite Drehzahl (45-55 U/min) reduziert, die geeignet ist, die Wäsche zum Verlassen der Trommelwände zu veranlassen, so dass diese selbst in Richtung der Trommel fallen. Bei Erreichen der zweiten Drehzahl wird die Drehzahl wieder erhöht, bevor sich die Wäsche am Trommelboden sammelt. Diese Schritte werden wiederholt, bis die Wäsche in der Trommel ausgeglichen ist.In the DE 696 22 067 T3 there is described a method of balancing in a laundry and / or dryer machine and a machine for carrying out this method. For this purpose, in an initial rotational phase, a drum is rotated at a first speed, which causes a substantial adherence of the garments to the drum walls, and determined in a detection phase of the equilibrium state during this initial phase. Compensatory measures are then provided by the load itself. In these measures, the reduction of the number of drums is reduced from a first speed (90 rpm) to a predetermined second speed (45-55 rpm) which is suitable for causing the laundry to leave the drum walls so that they themselves fall in the direction of the drum. When the second speed is reached, the speed is increased again before the laundry collects on the drum bottom. These steps are repeated until the laundry in the drum is balanced.

Die Offenlegungsschrift EP 16 93 498 A2 zeigt ein Verfahren zum Steuern einer Schleuderdrehzahl einer Waschmaschine.The publication EP 16 93 498 A2 shows a method for controlling a spin speed of a washing machine.

Die Offenlegungsschrift WO 2008/075987 A2 zeigt ein Verfahren zum Betreiben einer Waschmaschine, wobei eine Schleuderdrehzahl abhängig von einer erfassten Unwucht eingestellt wird.The publication WO 2008/075987 A2 shows a method of operating a washing machine, wherein a spin speed is adjusted depending on a detected imbalance.

Die Patentschrift US 5,671,494 zeigt ein Verfahren zum Betreiben einer Waschmaschine.The patent US 5,671,494 shows a method for operating a washing machine.

Für eine optimale Verteilung der Wäschestücke vor dem eigentlichen Schleudern wird im Rahmen eines Wäschebehandlungsprogramms im Allgemeinen eine feste Zeit und/oder eine bestimmte Anzahl von Versuchen vorgesehen, mit denen eine vorgegebene obere Grenze für eine akzeptable Unwucht durch eine ungleichmäßige Wäscheverteilung erreicht werden kann.For optimum distribution of the laundry items prior to the actual spin, a laundry treatment program generally provides a fixed time and / or a number of attempts to achieve a predetermined upper limit for acceptable unbalance through non-uniform laundry distribution.

Aufgabe der vorliegenden Erfindung war es vor diesem Hintergrund, ein Verfahren zum Betrieb einer Waschmaschine bereitzustellen, bei dem eine Schleuderphase in Hinblick auf die hierfür benötigte Zeit und Effizienz optimal gestaltet werden kann. Insbesondere soll ein solches Verfahren das Steuern einer Schleuderphase in einer Waschmaschine ermöglichen, wobei eine Schleuderphase mit einem ausgewogenen Verhältnis an akzeptabler Unwucht und zeitlicher Dauer bereitgestellt werden kann.Against this background, the object of the present invention was to provide a method for operating a washing machine, in which a spin phase can be optimally designed with regard to the time and efficiency required for this purpose. In particular, such a method should allow controlling a spin phase in a washing machine, whereby a spin phase can be provided with a balanced ratio of acceptable unbalance and time duration.

Die der Erfindung zugrunde liegende Aufgabe wird durch ein Verfahren zum Betreiben einer Waschmaschine zur Behandlung von Wäschestücken sowie eine hierfür geeignete Waschmaschine gemäß den unabhängigen Patentansprüchen gelöst. Bevorzugte Ausgestaltungen der Erfindung sind in den jeweils abhängigen Patentansprüchen aufgeführt. Bevorzugten Ausgestaltungen des Verfahrens entsprechen bevorzugte Ausgestaltungen der Waschmaschine, auch wenn hierin nicht jeweils gesondert darauf hingewiesen wird.The object underlying the invention is achieved by a method for operating a washing machine for the treatment of laundry items and a suitable washing machine according to the independent claims. Preferred embodiments of the invention are listed in the respective dependent claims. Preferred embodiments of the method correspond to preferred embodiments of the washing machine, even if not separately pointed out here in each case.

Gegenstand der Erfindung ist somit ein Verfahren zum Steuern einer Schleuderphase mit mehreren Schleuderschritten in einem Wäschebehandlungsverfahren in einer Waschmaschine mit einer in einem Laugenbehälter um eine im Wesentlichen horizontale Achse drehbar gelagerten Trommel und einer Programmsteuerung, bei welchem Verfahren in der Schleuderphase vor jedem Schleuderschritt in einem Wäscheverteilschritt eine Verteilung der Wäschestücke in einem Innenraum der Trommel durch ein Erhöhen und/oder Senken einer Drehzahl der Trommel vorgenommen wird, wobei für den Wäscheverteilschritt n vor dem Schleuderschritt n eine maximale Verteilzeit tmax n oder/und eine maximale Anzahl mtr n an Verteilversuchen für das Erreichen oder Unterschreiten eines maximalen Wertes Dmax 1 einer akzeptablen ungleichmäßigen Verteilung der Wäschestücke vorgegeben ist, und wobei

  1. (a) für jeden Wäscheverteilschritt n die tatsächlich benötigte Zeit tact n ermittelt wird;
  2. (b) eine Differenz Δtn = tset n-tact n zwischen der tatsächlichen Zeit tact n und einer vorgegebenen Zeit tset n für den Wäscheverteilschritt n berechnet wird; und
  3. (c) in Abhängigkeit von der berechneten Differenz Δtn = tset n-tact n eine Entscheidung über den weiteren Ablauf der Schleuderphase getroffen wird.
The invention thus relates to a method for controlling a spin phase with several spin stages in a laundry treatment process in a washing machine with a drum rotatably mounted in a tub around a substantially horizontal axis and a program control, in which method in the spin phase before each spin step in a laundry distribution step a distribution of the laundry items in an interior of the drum is made by increasing and / or decreasing a rotational speed of the drum, wherein for the laundry distribution step n before the spin step n a maximum distribution time t max n or / and a maximum number m tr n of distribution experiments for the reaching or falling below of a maximum value D max 1 of an acceptable uneven distribution of the laundry items is predetermined, and wherein
  1. (a) the actually required time t act n is determined for each laundry distribution step n;
  2. (b) a difference Δt n = t set n -t act n between the actual time t act n and a predetermined time t n is calculated for the set Wäscheverteilschritt n; and
  3. (c) depending on the calculated difference Δt n = t set n -t act n, a decision is made about the further course of the spin phase.

Hierbei umfasst die vorgegebene Zeit tset n die vorgegebene Zeit für den Wäscheverteilschritt an sich, aber auch die Zeit, die sich ergibt, wenn man eine Anzahl an zulässigen Wäscheteilversuchen mittels eines Zeitraums angibt.Here, the predetermined time t set n comprises the predetermined time for the laundry distribution step per se, but also the time that results when indicating a number of permissible partial washing attempts by means of a period of time.

In einem erfindungsgemäß bevorzugten Verfahren ist als maximaler Wert Dmax 1 einer akzeptablen ungleichmäßigen Verteilung der Wäschestücke eine maximal akzeptable Unwucht UNmax 1 vorgegeben. Hierbei kann die Unwucht auf sehr unterschiedliche Weise bestimmt werden. So können ein Motorstrom und/oder eine Motorleistung und/oder eine Motorenergie und/oder eine Auslenkung eines Laugenbehälters aus einer Ruhestellung, eine Trommeldrehzahl und/oder eine Geschwindigkeit betrachtet werden. Die Unwucht wird vorzugsweise anhand einer Drehzahlschwankung der Trommel und/oder einer Auslenkung des Laugenbehälters bestimmt. Dabei kann die Unwucht besonders zuverlässig und genau mittels der Auslenkung des Laugenbehälters ermittelt werden, weil eine Vorhersage der Unwucht aus der Drehzahlschwankung weniger stark von der Beladung der Trommel mit Wäschestücken abhängt.In a method which is preferred according to the invention, the maximum value D max 1 of an acceptable uneven distribution of the laundry items is a maximum acceptable unbalance UN max 1 . Here, the imbalance can be determined in very different ways. Thus, a motor current and / or an engine power and / or an engine energy and / or a deflection of a tub from a rest position, a drum speed and / or a speed can be considered. The unbalance is preferably determined based on a speed variation of the drum and / or a deflection of the tub. In this case, the imbalance can be determined particularly reliably and accurately by means of the deflection of the tub, because a prediction of the imbalance from the speed fluctuation depends less strongly on the loading of the drum with laundry.

Vorzugsweise wird eine durch die Wäschestücke bewirkte Unwucht der Trommel zu einem Zeitpunkt bestimmt, zu dem die Wäschestücke im Wesentlichen vollständig an der Innenwand der Trommel anliegen.Preferably, an imbalance of the drum caused by the laundry items is determined at a time at which the laundry items substantially completely abut the inner wall of the drum.

Vorteilhaft kann für die Bestimmung der Unwucht beziehungsweise zur Reduktion der Unwucht auch der Grad des Anliegens der Wäschestücke an der Innenwand der Trommel, die als eine Stabilität einer Verteilung der Wäschestücke in dem Innenraum der Trommel bezeichnet werden kann, herangezogen werden. Ein solches Verfahren ist im Detail in der DE 10 2008 055 091 A1 beschrieben.Advantageously, for the determination of the imbalance or for the reduction of the imbalance, the degree of concern of the laundry items on the inner wall of the drum, which can be referred to as a stability of a distribution of the laundry items in the interior of the drum, are used. Such a method is described in detail in the DE 10 2008 055 091 A1 described.

In einer bevorzugten Ausführungsform des Verfahrens wird einem Benutzer der Waschmaschine für den Fall des Vorliegens einer Differenz Δtn größer 0 eine Auswahlmöglichkeit angeboten, die weitere Schleuderphase in Hinblick auf eine minimale zeitliche Dauer oder eine erreichbare minimale Restfeuchte zu gestalten.In a preferred embodiment of the method a user of the washing machine in the event of the presence of a difference .DELTA.t n is greater than 0 offered a choice to design the further spin-extraction phase in terms of a minimum temporal duration or an achievable minimum of residual moisture.

In einer Ausführungsform kann hierzu ein Benutzer der Waschmaschine schon vor dem Beginn eines Wäschebehandlungsschrittes eine Auswahl treffen. In Ergänzung oder alternativ hierzu kann bei einer weiteren Ausführungsform ein Benutzer auch während eines Wäschebehandlungsprogrammes, z.B., wenn dem Benutzer eine Information über das Vorliegen einer Differenz Δtn größer 0 angezeigt wird, eine solche Auswahl über die weitere Gestaltung der Schleuderphase treffen.For this purpose, in one embodiment, a user of the washing machine can make a selection even before the beginning of a laundry treatment step. In addition or alternatively, in a further embodiment, a user may also make such a selection about the further design of the spin phase during a laundry treatment program, eg when the user is informed about the presence of a difference Δt n greater than 0.

In einer bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird daher bei einer Differenz Δtn größer null die Schleuderphase zeitlich verkürzt.In a preferred embodiment of the method according to the invention, therefore, the spin phase is shortened in time with a difference Δt n greater than zero.

In einer weiteren, bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird zumindest ein Teil der Zeitdifferenz Δtn größer 0 als Zeitguthaben zu der für den nächsten Wäscheverteilschritt vorgegebenen Zeitdauer tset n+1 addiert.In a further preferred embodiment of the method according to the invention a part of the time difference is at least .DELTA.t n is greater than 0 to the predetermined time credits for the next Wäscheverteilschritt set time period t n + 1 is added.

Hierbei kann es vorteilhaft sein, dass die Zeitdifferenz Δtn größer 0 als Zeitguthaben zu einem Anteil x zu der für den nächsten Wäscheverteilschritt vorgegebenen Zeitdauer tset n+1 addiert wird, wobei der letzte Wäscheverteilschritt vor dem Endschleudern ausgenommen ist, und ein Anteil y, wobei x+y=1 ist, zur Dauer tset n+1 des letzten Wäscheverteilschrittes vor dem Endschleudern addiert wird. Vorzugsweise liegt hierbei x im Bereich von 0,2 bis 0,4 und und y im Bereich von 0,6 bis 0,8. Beispielsweise kann x gleich 0,3 sein und y gleich 0,7.It may be advantageous that the time difference .DELTA.t n is greater than 0 as the time credit to a fraction x to the predetermined for the next Wäscheverteilschritt time period t is added, where the last Wäscheverteilschritt is excluded before the final spin set n + 1, and a proportion of y, where x + y = 1 is added to the duration t set n + 1 of the last laundry distribution step before the final spin. In this case, x preferably lies in the range from 0.2 to 0.4 and y in the range from 0.6 to 0.8. For example, x may be equal to 0.3 and y may be equal to 0.7.

In einer besonders bevorzugten Ausführungsform werden die Zeitdifferenzen Δtn aufsummiert und der gebildete Gesamtzeitraum tmax für die zeitliche Verlängerung der Dauer tset n des letzten Wäscheverteilschrittes vor dem Endschleudern eingesetzt.In a particularly preferred embodiment, the time difference .DELTA.t n are summed up and the formed total period t max for the temporal extension of the duration t n of the set used last Wäscheverteilschrittes before the final spin.

Das Vorliegen einer Zeitdifferenz Δtn größer 0, also eines Zeitguthabens, ist eine wichtige Information sowohl über den bisherigen Verlauf eines Wäschebehandlungsverfahrens als auch über den zukünftigen Verlauf eines Wäschebehandlungsverfahrens sowie dessen Gestaltungsmöglichkeiten.The existence of a time difference .DELTA.t n greater than 0, so one time credit is an important information both on the progress of a laundry treatment process as well as on the future course of a laundry treatment process and its design possibilities.

In einer bevorzugten Ausführungsform der Erfindung wird daher bei Vorliegen einer Zeitdifferenz Δtn größer 0 auf einer Anzeigevorrichtung der Waschmaschine das Vorliegen einer guten Verteilung der Wäschestücke in der Trommel angezeigt. Bei der Anzeigevorrichtung kann es sich beispielsweise um eine optische oder eine akustische Anzeigevorrichtung handeln.In a preferred embodiment of the invention, therefore, if a time difference Δt n greater than 0 is present on a display device of the washing machine, the presence of a good distribution of the laundry items in the drum is indicated. The display device may be, for example, an optical or an acoustic display device.

Alternativ oder in Ergänzung hierzu kann bei Vorliegen einer Zeitdifferenz Δtn kleiner 0 auf einer Anzeigevorrichtung der Waschmaschine das Vorliegen einer schlechten Verteilung der Wäschestücke in der Trommel angezeigt werden. Es kann dabei überdies vorteilhaft vorgesehen sein, dass bei mehrfachem Vorliegen einer Zeitdifferenz Δtn kleiner 0 das Schleudern abgebrochen wird. So kann eine solche Situation einem Benutzer der Wäschemaschine angezeigt werden, der dann geeignete Gegenmaßnahmen ergreifen kann. Beispielsweise kann die Beladung der Trommel mit Wäschestücken verringert oder aber deren Anordnung in der Trommel manuell beeinflusst werden.Alternatively or in addition thereto, if a time difference Δt n less than 0 is present on a display device of the washing machine, the presence of a poor distribution of the laundry items in the drum can be indicated. It may be also advantageously provided that in case of multiple presence of a time difference .DELTA.t n is less than 0, the spinning is stopped. Thus, such a situation can be displayed to a user of the laundry machine, who can then take appropriate countermeasures. For example, the loading of the drum with laundry items can be reduced or their arrangement in the drum can be influenced manually.

Das Vorliegen eines Zeitguthabens im Sinne der Erfindung kann erfindungsgemäß zu weiteren Maßnahmen führen. So kann vorteilhaft für den Fall, dass Δtn größer ist als ein vorgegebener Schwellenwert ts, ein Wert Dmax 2 < Dmax 1 für den maximalen Wert einer akzeptablen ungleichmäßigen Verteilung der Wäschestücke festgelegt werden. Es wird dann eine noch bessere Verteilung der Wäsche vor einem Schleuderschritt angestrebt.The existence of a time credit within the meaning of the invention can lead to further measures according to the invention. Thus, in the case that Δt n is greater than a predetermined threshold value t s , it is advantageous to set a value D max 2 <D max 1 for the maximum value of an acceptable non-uniform distribution of the laundry items. It is then sought an even better distribution of the laundry before a spin step.

Andere Modifikationen der Wäscheverteilschritte oder Schleuderschritte können ebenfalls vorgenommen werden.Other modifications of the laundry distribution steps or spin steps may also be made.

Die Tendenz zur Ausbildung einer Unwucht ist bei Vorliegen einer großen Beladung der Trommel mit Wäschestücken größer. In einer bevorzugten Ausführungsform der Erfindung sind daher in der Steuervorrichtung der Waschmaschine mehrere Werte für eine vorgegebene Zeit tset n für den Wäscheverteilschritt in Abhängigkeit von einer Beladungsmenge der Waschmaschine mit Wäschestücken und/oder in Abhängigkeit von dem maximalen Wert Dmax für den maximalen Wert einer akzeptablen ungleichmäßigen Verteilung der Wäschestücke hinterlegt.The tendency to form an imbalance is greater in the presence of a large load of the drum with laundry. In a preferred embodiment of the invention, therefore, in the control device of the washing machine, a plurality of values for a predetermined time t set n for the Wäscheverteilschritt depending on a loading amount of the washing machine with laundry and / or in dependence on the maximum value D max for the maximum value of one acceptable uneven distribution of garments deposited.

Gegenstand der Erfindung ist außerdem eine Waschmaschine mit einer in einem Laugenbehälter um eine im Wesentlichen horizontale Achse drehbar gelagerten Trommel und einer Programmsteuerung, die eingerichtet ist, um ein Verfahren durchzuführen, bei dem in der Schleuderphase vor jedem Schleuderschritt in einem Wäscheverteilschritt eine Verteilung der Wäschestücke in einem Innenraum der Trommel durch ein Erhöhen und/oder Senken einer Drehzahl der Trommel vorgenommen wird, wobei für den Wäscheverteilschritt n vor dem Schleuderschritt n eine maximale Verteilzeit tmax oder/und eine maximale Anzahl mtr an Verteilversuchen für das Erreichen oder Unterschreiten eines maximalen Wertes Dmax 1 einer akzeptablen ungleichmäßigen Verteilung der Wäschestücke vorgegeben ist. Die erfindungsgemäße Waschmaschine ist eingerichtet, um ein Verfahren mit den Schritten, dass

  1. (a) für jeden Wäscheverteilschritt n die tatsächlich benötigte Zeit tact n ermittelt wird;
  2. (b) eine Differenz Δtn = tset n-tact n zwischen der tatsächlichen Zeit tact n und einer vorgegebenen Zeit tset n für den Wäscheverteilschritt n berechnet wird; und
  3. (c) in Abhängigkeit von der berechneten Differenz Δtn = tset n-tact n eine Entscheidung über den weiteren Ablauf der Schleuderphase getroffen wird,
durchzuführen.The invention also relates to a washing machine with a drum rotatably mounted in a tub about a substantially horizontal axis and a program control, which is adapted to perform a method in which in the spin phase before each spin step in a laundry distribution step, a distribution of the laundry items in an interior of the drum is made by increasing and / or decreasing a rotational speed of the drum, wherein for the laundry distribution step n before the spin step n a maximum distribution time t max or / and a maximum number m tr of distribution attempts for reaching or falling below a maximum value D max 1 an acceptable uneven distribution of the laundry is given. The washing machine according to the invention is adapted to a method with the steps that
  1. (a) the actually required time t act n is determined for each laundry distribution step n;
  2. (b) calculating a difference Δt n = t set n -t act n between the actual time t act n and a predetermined time t set n for the laundry distribution step n; and
  3. (c) depending on the calculated difference Δt n = t set n -t act n, a decision is made about the further course of the spin phase,
perform.

Die Waschmaschine der vorliegenden Erfindung ist eine Waschmaschine im eigentlichen Sinne oder ein Waschtrockner. Im Folgenden wird für beide Geräte der Ausdruck Waschmaschine verwendet.The washing machine of the present invention is a washing machine in the strict sense or a washer-dryer. In the following, the term washing machine is used for both devices.

Eine erfindungsgemäße Waschmaschine verfügt insbesondere im Allgemeinen über Mittel, um eine ungleichmäßige Verteilung der Wäschestücke in der Trommel festzustellen.In particular, a washing machine according to the invention generally has means for detecting uneven distribution of the laundry items in the drum.

Beispielsweise kann eine erfindungsgemäße Waschmaschine einen Wegesensor aufweisen, welcher in der Lage ist, eine Auslenkung des Laugenbehälters aus einer Ruhestellung zu detektieren, und ein für diese Auslenkung charakteristisches Signal zu erzeugen.For example, a washing machine according to the invention may have a travel sensor which is able to detect a deflection of the tub from a rest position and to generate a signal characteristic of this deflection.

Die Erfindung hat den Vorteil, dass eine Schleuderphase optimal gesteuert werden kann. Wenn in einem Wäscheverteilungsschritt weniger Zeit benötigt wird als vorgesehen, kann das entstandene Zeitguthaben für weitere Wäscheverteilungsschritte eingesetzt werden. Dies erhöht insgesamt die Wahrscheinlichkeit dafür, dass eine gute Wäscheverteilung, insbesondere eine Wäscheverteilung mit einer kleinen Wäscheunwucht erreicht wird. Dies ermöglicht wiederum, dass ein Schleudern in der Waschmaschine vorteilhaft mit besonders hohen Trommeldrehzahlen durchgeführt werden kann. Dies führt zu einer reduzierten Restfeuchte der Wäsche. So können die Erfordernisse hinsichtlich der Labelauslobung für die Drehzahl und Restfeuchte besonders gut erreicht werden. Schließlich wird als Ergebnis eines verbesserten Schleuderverfahrens auch erreicht, dass Waschmittelreste besonders gut ausgetrieben werden. Dies ist besonders für empfindliche Personen von Bedeutung, die empfindlich auf Waschmittelreste in der Kleidung reagieren. So könnte ein so genanntes "Allergikerprogramm" durchgeführt werden. Schließlich ist aufgrund der verringerten Unwucht auch eine Tendenz der Waschlauge zur Ausbildung von Schaum verringert. In Ausführungsformen der Erfindung kann zudem eine sehr kurze Programmdauer erzielt werden.The invention has the advantage that a spin phase can be optimally controlled. If less time is required in a laundry distribution step than intended, the resulting time credit can be used for further laundry distribution steps. Overall, this increases the probability that a good laundry distribution, in particular a laundry distribution with a small laundry imbalance is achieved. This allows in turn that a spin in the washing machine can be advantageously carried out with particularly high drum speeds. This leads to a reduced residual moisture of the laundry. Thus, the requirements for the label claim for the speed and residual moisture can be achieved particularly well. Finally, as a result of an improved spin method, it is also achieved that detergent residues are expelled particularly well. This is especially important for sensitive people who are sensitive to detergent residues in clothing. So a so-called "allergy program" could be carried out. Finally, due to the reduced imbalance, a tendency of the wash liquor to form foam is also reduced. In embodiments of the invention also a very short program duration can be achieved.

Schließlich ermöglicht das erfindungsgemäße Verfahren auch einen Betrieb einer Waschmaschine mit reduzierten Schleudergeräuschen.Finally, the method according to the invention also makes it possible to operate a washing machine with reduced centrifugal noise.

Überdies ist das Vorhandensein eines Zeitguthabens ein Indiz dafür, dass eine Wäscheverteilungsstrategie in der Waschmaschine optimal ist.Moreover, the presence of a time credit is an indication that a laundry distribution strategy in the washing machine is optimal.

Claims (11)

  1. Method for controlling a spin cycle having a plurality of spin steps in a laundry treatment method in a washing machine having a drum, mounted rotatably about an essentially horizontal axis in a tub, and a program controller, in which method the laundry items are distributed in an inner chamber of the drum by an increase and/or decrease in a speed of the drum in the spin cycle before every spin step in a laundry distribution step, wherein a maximum distribution time tmax n and/or a maximum number mtr n of distribution attempts for reaching or falling short of a maximum value Dmax 1 of an acceptable irregular distribution of the laundry items is specified for the laundry distribution step n before the spin step n, characterised in that
    (a) the time tact n actually required is determined for every laundry distribution step n;
    (b) a difference Δtn = tset n-tact n between the actual time tact n and a specified time tset n for the laundry distribution step n is calculated; and
    (c) a decision on the further course of the spin cycle is made as a function of the calculated difference Δtn = tset n-tact n,
    that for a difference Δtn greater than zero, the spin cycle is shortened in time,
    or
    that at least part of the time difference Δtn greater than 0 is added as a time credit to the time duration tset n+1 specified for the next laundry distribution step,
    such that the time difference Δtn greater than 0 is added as a time credit at a proportion x to the time duration tset n+1 specified for the next laundry distribution step,
    wherein the last laundry distribution step before the final spin is excluded, and a proportion y, where x+y=1, is added to the duration tset n+1 of the last laundry distribution step before the final spin, or
    that the time differences Δtn are summed and the total time period tmax formed for the temporal extension of the duration tset n of the last laundry distribution step before the final spin is used.
  2. Method according to claim 1, characterised in that a maximum acceptable imbalance UNmax 1 is specified as the maximum value Dmax 1 of an acceptable irregular distribution of the laundry items.
  3. Method according to claim 2, characterised in that the imbalance is determined based on a rotational speed variation of the drum and/or a displacement of the tub.
  4. Method according to one of claims 1 to 3, characterised in that in the event of the presence of a difference Δtn greater than 0 a user of the washing machine is offered a choice to shape the further spin cycle in respect of a minimum temporal duration or an achievable minimum residual moisture.
  5. Method according to claim 1, characterised in that x is in the range from 0.2 to 0.4 and y is in the range from 0.6 to 0.8.
  6. Method according to one of claims 1 to 5, characterised in that when there is a time difference Δtn greater than 0 the existence of a good distribution of the laundry items in the drum is displayed on a display device of the washing machine.
  7. Method according to one of claims 1 to 6, characterised in that when there is a time difference Δtn less than 0 the existence of a poor distribution of the laundry items in the drum is displayed on a display device of the washing machine.
  8. Method according to claim 7, characterised in that when there are multiple time differences Δtn less than 0 the spin is aborted.
  9. Method according to one of claims 1 to 8, characterised in that in the event that Δtn is greater than a specified threshold value ts, a value Dmax 2 < Dmax 1 is set for the maximum value of an acceptable irregular distribution of the laundry items.
  10. Method according to one of claims 1 to 9, characterised in that in the control device of the washing machine values for a specified time Tset n for the laundry distribution step are stored as a function of a load quantity of the washing machine with laundry items and/or as a function of the maximum value Dmax for the maximum value of an acceptable irregular distribution of the laundry items.
  11. Washing machine having a drum, mounted rotatably about an essentially horizontal axis in a tub, and having a program controller which is set up to execute a method in which the laundry items are distributed in an inner chamber of the drum by an increase and/or decrease in a speed of the drum in the spin cycle before every spin step in a laundry distribution step, wherein a maximum distribution time tmax and/or a maximum number mtr of distribution attempts for reaching or falling short of a maximum value Dmax 1 of an acceptable irregular distribution of the laundry items is specified for the laundry distribution step n before the spin cycle n,
    characterised in that the washing machine is set up to perform a method according to one of the preceding claims.
EP12791758.1A 2011-12-02 2012-11-27 Method for operating a washing machine having an improved spin cycle Active EP2785904B1 (en)

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DE3141901C2 (en) * 1981-10-22 1986-06-19 Hoesch Ag, 4600 Dortmund Combined washing machine and spin dryer or the like.
IT1271782B (en) * 1994-12-21 1997-06-09 Whirlpool Italia METHOD AND ARRANGEMENT TO OBTAIN A BALANCE OF THE LOAD IN THE WASHING MACHINE MACHINES
IT1279162B1 (en) * 1995-03-14 1997-12-04 Merloni Elettrodomestici Spa METHOD FOR BALANCING THE LOAD IN A MACHINE FOR WASHING AND / OR DRYING LINEN, AND MACHINE IMPLEMENTING THIS METHOD
DE19616985A1 (en) * 1996-04-27 1997-10-30 Aeg Hausgeraete Gmbh Equalising imbalance in washing machine drum
DE19753382A1 (en) * 1997-12-02 1999-06-10 Ako Werke Gmbh & Co Method for distributing laundry in a washing drum of a washing machine
GB2368071A (en) * 2000-10-17 2002-04-24 Notetry Ltd Method of operating a laundry appliance
US7331075B2 (en) * 2003-08-07 2008-02-19 Lg Electronics Inc. Spin-dry control method in washing machine
US7530133B2 (en) * 2005-02-18 2009-05-12 Whirlpool Corporation Method for controlling a spin cycle in a washing machine
NZ552422A (en) * 2006-12-21 2009-09-25 Fisher & Paykel Appliances Ltd Laundry appliance including control means which energises a motor to evenly distribute a load in response to signals from load sensors
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DE102011087644B3 (en) 2012-12-13
WO2013079470A1 (en) 2013-06-06

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