EP1354997B1 - Method to control the drum rotating speed of a program controlled machine for treating clothes - Google Patents

Method to control the drum rotating speed of a program controlled machine for treating clothes Download PDF

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Publication number
EP1354997B1
EP1354997B1 EP03006976A EP03006976A EP1354997B1 EP 1354997 B1 EP1354997 B1 EP 1354997B1 EP 03006976 A EP03006976 A EP 03006976A EP 03006976 A EP03006976 A EP 03006976A EP 1354997 B1 EP1354997 B1 EP 1354997B1
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EP
European Patent Office
Prior art keywords
drum
laundry
rotational speed
washing
speed value
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EP03006976A
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German (de)
French (fr)
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EP1354997A1 (en
Inventor
Walter Dietz
Diethard Krause
Daniel Schneider
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Miele und Cie KG
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Miele und Cie KG
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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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/50—Control of washer-dryers characterised by the purpose or target of the control
    • D06F33/52—Control of the operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/04—Quantity, e.g. weight or variation of weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 

Definitions

  • the invention relates to a method for controlling the drum speed of a program - controlled laundry machine, such as a washing machine, washer dryer or tumble dryer, with a drum rotatable about an at least approximately horizontal axis, with a drive motor for the drum, with a measuring device for determining a loading parameter, which differs from the one in the drum filled laundry, and with a control device for setting the drive motor to different speeds in different sections of a washing or drying program in such a way that during a washing or drying program section individual rotation cycles are performed with intervening pauses, wherein during a Rotation cycle the drum is driven at different speeds, which are between a lower speed value and an upper speed value.
  • a program - controlled laundry machine such as a washing machine, washer dryer or tumble dryer
  • the mechanical effect on the laundry is one of the factors that significantly influence the washing result.
  • the individual items of laundry during the rotation of the drum must be raised to the 12 o'clock position and then fall down after detachment from the drum shell by gravity ,
  • the centrifugal force of the laundry must be slightly smaller than the gravitational force, see, e.g. GB 2 322 141 A.
  • US 5,560,061 discloses a method for controlling the drum speed of a washing machine, wherein a predetermined speed (rpm) is used for each rotation cycle.
  • rotation cycles are set at different speeds alternately, so that in a first rotation cycle, the speed to be performed is set so that the force exerted on the laundry in the drum centrifugal force is below the gravitational force, while set at a second rotation cycle, the speed to be executed so high is that the centrifugal force applied to the laundry in the drum is above the gravitational force.
  • a predetermined speed rpm
  • a washing machine in which a measuring device in the form of a displacement sensor determines a loading stage which corresponds to the weight of the amount of laundry filled into the drum.
  • a manufactured and distributed by the applicant washing machine W 487 WPS rotates the drum during the wash program section in the program "Cottons” with the known from DE 39 33 355 A1 rotation cycles and has the well-known from DE 100 05 991 A1 weight measuring device
  • a washing machine W 453 WPS manufactured and sold by the applicant also rotates the drum during the wash program section in the program "Cottons” with the rotary cycles known from DE 39 33 355 A1 and has the loading stage recognition known from DE 44 38 760 A1.
  • a tumble dryer with a device for detecting the dependent on the filled laundry movement behavior of the laundry in the drum is known.
  • the tumble dryer has a control device which controls the drive motor for the drum drive as a function of the movement behavior such that a desired movement behavior of the laundry in the drum is adjustable via the drum speed.
  • the laundry in the drum in the course of the drying process after a predetermined trajectory through the heated dry air stream to be performed.
  • Such a dryer is for drying laundry items with large webs, as z. B. incurred in hospitals, suitable.
  • the speed control of the drum drive motor depending on the movement behavior of the laundry is not suitable
  • JP 11 057 297 A discloses a tumble dryer in which the loading quantity is detected by means of an electrode and an evaluation circuit. Depending on the loading quantity, the rotational movement of the drum is influenced, in particular the speed and the number of revolutions in the normal and reversing cycle.
  • the invention thus presents the problem to disclose a method for controlling the drum speed of a program-controlled laundry treatment machine of the type mentioned, in which the mechanical action on the laundry is improved in the washing process or a uniform flow through the laundry in the dry process is made possible.
  • FIG. 1 An embodiment of the invention is shown purely schematically with reference to a drawing and will be described in more detail below.
  • the figure shows a speed-time diagram for two cycles in reversing at different loading levels.
  • the structure of a washing machine for carrying out the washing process designed according to the invention is known for example from DE 100 05 991 A1 and therefore not shown here in detail. It has a tub in which a drum for receiving laundry is rotatably mounted about a horizontal axis. The rotation of the drum via a drive motor. The tub is suspended on springs swinging in the housing and is supported for damping these vibrations in the lower area by shock absorbers against the housing bottom.
  • a microprocessor control is provided, which is connected via signal lines with different encoders and the controls. It passes time and status-dependent commands via control lines to different actuators and thus acts as a control device for setting the drive motor to different speeds.
  • the drum is reversely rotated, with pause times being arranged between the individual rotating cycles. The speed profile used will be described later.
  • a weight sensor with which the loading amount of the drum can be determined.
  • the sensor used is a displacement sensor arranged parallel to the shock absorber, with which the weight-dependent tub container altitude is detected.
  • Other weight sensors such as strain gauges, may also be used. From the static portion of the displacement sensor signal from the microprocessor controller, a loading stage B s is determined and stored in a memory which corresponds to the weight of the filled into the drum amount of laundry.
  • a method known from DE 44 38 760 A1 can be used for determining a loading stage B s dependent on the type of laundry and the amount of laundry in which an evaluation circuit integrated in the microprocessor control controls the loading stage as a function of the vibration behavior of the speed signal the turning cycle in a first program section, in particular in the pre-wash program or in the main wash program determined.
  • the microprocessor control sets as control device for the adjustment of the drive motor in response to the stored loading level value B s a lower speed value n min and an upper speed value n max as the limit for the washing speed, as listed in the table below:
  • Loading level B s minimum speed n min upper speed value n max 1 kg 40 min -1 50 min -1 2 kg 40 min -1 55 min -1 3 kg 35 min -1 60 min -1 4 kg 30 min -1 70 min -1 5 kg 30 min -1 80 min -1
  • the speed range which has been determined as a function of the loading stage, is traversed in the trapezoidal shape shown in the figure. Alternatively, an ascending or descending ramp or roof shape can be used as the speed profile.
  • the inventive design of the method takes into account that the laundry is distributed in several planes with different radii on the drum circumference, wherein the number of levels depends on the load. Each level is optimally excited by the load-dependent variation of the speed within a turning cycle. At very low loads, a low RPM value and low bandwidth is used to ensure that the laundry is released from the drum shell while still achieving a high level of washing mechanics.
  • the speed profile thus has the form of a relatively flat trapezium (see I). For medium loads, the speed range can be extended up to 60 min -1 , since the application of the wash only takes place above this value (see trapezoidal shape II).
  • the tumble dryer for carrying out the inventively designed drying process has a rotatably mounted drum for receiving laundry and a fan for Promotion of heated by means of heating drying air through the drum.
  • the drum is rotated by a drive motor in alternating directions of rotation.
  • the tumble dryer is also designed with a device for detecting and evaluating the residual moisture content in the laundry and the load.
  • a microprocessor control is provided, which is connected via signal lines with different encoders and the operating elements. It passes time and status-dependent commands via control lines to different actuators and thus acts as a control device for setting the drive motor to different speeds.
  • the drum is rotated reversing within a dry program section, with pause times are arranged between each rotation cycles.
  • the microprocessor control sets as a control device for the adjustment of the drive motor in response to the dryer-specific stored load levels and residual moisture levels a lower speed value n min and an upper speed value n max as the limit for the dry speed.
  • the speed profile used here corresponds to the profile which has already been described in detail for the washing process.
  • the process described is particularly useful in the washing and drying of cotton textiles, i. H. in a "cooking / color wash program" advantageous because there large quantities of fabric are filled in the drum. It may be expedient to use the above-described speed profiles also in the rinse program section, since this results in a better mixing with rinse water and thus the rinsing effect is improved.

Abstract

The washing method has the washing program divided into successive steps, with intermediate pauses between individual rotation cycles in which the drive motor for the rotary washing drum is operated at different revs lying between a lower rev value and an upper rev value selected in dependence on the measured loading of the washing machine drum. The rev-time profile for each rotation cycle may have a trapezoidal waveform.

Description

Die Erfindung betrifft ein Verfahren zur Steuerung der Trommeldrehzahl einer programmgesteuerten Wäschebehandlungsmaschine, wie Waschmaschine, Waschtrockner oder Wäschetrockner, mit einer um eine wenigstens annähernd horizontale Achse drehbaren Trommel, mit einem Antriebsmotor für die Trommel, mit einer Messeinrichtung zur Bestimmung eines Beladungsparameters, der von der in die Trommel eingefüllten Wäsche abhängig ist, und mit einer Steuereinrichtung für die Einstellung des Antriebsmotors auf unterschiedliche Drehzahlen in verschiedenen Abschnitten eines Wasch- oder Trockenprogramms in der Art, dass während eines Wasch- oder Trockenprogrammabschnitts einzelne Drehzyklen mit dazwischen gelagerten Pausen durchgeführt werden, wobei während eines Drehzyklus die Trommel mit verschiedenen Drehzahlen angetrieben wird, die zwischen einem unteren Drehzahlwert und einem oberen Drehzahlwert liegen.The invention relates to a method for controlling the drum speed of a program - controlled laundry machine, such as a washing machine, washer dryer or tumble dryer, with a drum rotatable about an at least approximately horizontal axis, with a drive motor for the drum, with a measuring device for determining a loading parameter, which differs from the one in the drum filled laundry, and with a control device for setting the drive motor to different speeds in different sections of a washing or drying program in such a way that during a washing or drying program section individual rotation cycles are performed with intervening pauses, wherein during a Rotation cycle the drum is driven at different speeds, which are between a lower speed value and an upper speed value.

Beim Waschen von Textilien ist die mechanische Einwirkung auf die Wäsche einer der Faktoren, die das Waschergebnis maßgeblich beeinflussen. Um in einer Waschmaschine mit einer horizontal oder annähernd horizontal und drehbar gelagerten Trommel eine möglichst große Waschmechanik zu erreichen, müssen die einzelnen Wäschestücke während der Drehung der Trommel bis in die 12-Uhr-Position angehoben werden und dann nach Ablösung vom Trommelmantel schwerkraftbedingt nach unten fallen. Hierzu muss die Fliehkraft der Wäsche geringfügig kleiner als die Erdanziehungskraft sein, siehe z.B. GB 2 322 141 A. Da die Fliehkraft von der Entfernung des Wäschestücks von der Drehachse der Trommel abhängt, ist die Durchführung eines Drehzyklus mit einem festgelegten und immer gleichen Drehzahlwert nur für die Wäsche günstig, die einen bestimmten Abstand zur Trommelachse eingenommen hat. Als Richtwert für diesen Abstand wird hier in der Regel der Trommelradius angenommen. Die Wäsche, die näher zur Trommelachse liegt, fällt wesentlich eher, d. h., sie löst sich schon in der 9- oder 10-Uhr-Position und führt statt der Fallbewegung eine Rollbewegung aus.When washing textiles, the mechanical effect on the laundry is one of the factors that significantly influence the washing result. In order to achieve the largest possible washing mechanics in a washing machine with a horizontally or approximately horizontally and rotatably mounted drum, the individual items of laundry during the rotation of the drum must be raised to the 12 o'clock position and then fall down after detachment from the drum shell by gravity , For this purpose, the centrifugal force of the laundry must be slightly smaller than the gravitational force, see, e.g. GB 2 322 141 A. Since the centrifugal force depends on the distance of the item of laundry from the axis of rotation of the drum, the execution of a rotation cycle with a fixed and always the same speed value is only favorable for the laundry, which has taken a certain distance to the drum axis. As a guideline for this distance, the drum radius is generally assumed here. The laundry, which is closer to the drum axis, falls much more likely, d. h., it dissolves already in the 9 or 10 o'clock position and executes a rolling motion instead of the falling movement.

Die US 5,560,061 offenbart ein Verfahren zur Steuerung der Trommeldrehzahl einer Waschmaschine, bei der für jeweils einen Drehzyklus eine vorgegebene Drehzahl (rpm) verwendet wird. Insbesondere werden hier Drehzyklen mit unterschiedlicher Drehzahl abwechselnd eingestellt, so dass bei einem ersten Drehzyklus die auszuführende Drehzahl so eingestellt ist, dass die auf die in der Trommel befindliche Wäsche ausgeübte Fliehkraft unterhalb der Erdanziehungskraft liegt, während bei einem zweiten Drehzyklus die auszuführende Drehzahl so hoch eingestellt ist, dass die auf die in der Trommel befindliche Wäsche ausgeübte Fliehkraft oberhalb der Erdanziehungskraft liegt. Während der Waschphase wechseln sich diese Drehzyklen ab, wobei nur die Drehzyklen mit der niedrigen Enddrehzahl die mechanische Einwirkung auf die Wäsche bewirken.US 5,560,061 discloses a method for controlling the drum speed of a washing machine, wherein a predetermined speed (rpm) is used for each rotation cycle. In particular, here rotation cycles are set at different speeds alternately, so that in a first rotation cycle, the speed to be performed is set so that the force exerted on the laundry in the drum centrifugal force is below the gravitational force, while set at a second rotation cycle, the speed to be executed so high is that the centrifugal force applied to the laundry in the drum is above the gravitational force. During the Wash phase alternate these cycles of rotation, with only the rotation cycles with the low final speed cause the mechanical action on the laundry.

Aus der US 5,335,524 ist es bekannt, die Trommel während eines Drehzyklus' mit unterschiedlichen Drehzahlen zu bewegen. Hierbei beginnt jeder Drehzyklus mit einer geringen Drehzahl, wodurch eine gute Durchwässerung der Wäsche bewirkt wird. Die erhöhte Drehzahl bewirkt eine gute mechanische Einwirkung auf die Wäsche, wobei alle Drehzahlen stets deutlich unterhalb der Anlegedrehzahl liegen.From US 5,335,524 it is known to move the drum during a rotation cycle 'with different speeds. In this case, each rotation cycle begins at a low speed, whereby a good watering of the laundry is effected. The increased speed causes a good mechanical action on the laundry, all speeds are always well below the application speed.

Aus der DE 34 36 786 A1 ist es bekannt, die Trommel während des Waschprogrammabschnitts mit einer konstanten, aber von der Beladungsmenge abhängigen Drehzahl in der Art anzutreiben, dass bei zunehmender Beladungsmenge eine höhere Drehzahl verwendet wird. Dies bewirkt dann bei einem solchen Wäscheposten, dass große Fliehkräfte auf die Wäschestücke ausgeübt werden, die einen großen Abstand zur Drehachse besitzen und dass sich diese dann als Wäschering am Trommelmantel anlegen. Hierdurch wird ein freier Wäschefall verhindert.From DE 34 36 786 A1 it is known to drive the drum during the washing program section with a constant, but dependent on the loading speed in the way that with increasing load a higher speed is used. This then causes in such a batch of laundry that large centrifugal forces are exerted on the laundry items, which have a large distance from the axis of rotation and that these then create a laundry ring on the drum shell. As a result, a free laundry case is prevented.

Aus der DE 39 33 355 A1 ist es bekannt, während eines Waschprogrammabschnitts einzelne Drehzyklen in einem Reversierbetrieb mit dazwischen gelagerten Pausen durchzuführen, wobei während eines Drehzyklus die Trommel zunächst mit einem oberen Drehzahlwert von 55 min-1 und anschließend mit einem unteren Drehzahlwert von 40 min-1 gedreht wird. Hierbei soll der höhere Drehzahlwert eine zufriedenstellende mechanische Einwirkung auf die Wäsche verursachen und der niedrige Drehzahlwert deren Durchfeuchtung begünstigen.From DE 39 33 355 A1 it is known to carry out individual rotation cycles in a reversing operation with intervening pauses during a washing program section, wherein during a rotation cycle, the drum first with an upper speed value of 55 min -1 and then with a lower speed value of 40 min -1 is turned. Here, the higher speed value should cause a satisfactory mechanical action on the laundry and the low speed value favor their Durchfeuchtung.

Aus der DE 100 05 991 A1 ist eine Waschmaschine bekannt, bei der eine Messeinrichtung in Form eines Wegsensors eine Beladungsstufe bestimmt, die dem Gewicht der in die Trommel eingefüllten Wäschemenge entspricht.From DE 100 05 991 A1 a washing machine is known in which a measuring device in the form of a displacement sensor determines a loading stage which corresponds to the weight of the amount of laundry filled into the drum.

Aus der DE 44 38 760 A1 ist eine Waschmaschine bekannt, bei der eine Messeinrichtung aus dem Schwingungsverhalten des Drehzahlsignals während des Reversierzyklus eine von der Wäscheart und der Wäschemenge abhängige Beladungsstufe der in die Trommel eingefüllten Wäsche bestimmt.From DE 44 38 760 A1 discloses a washing machine is known in which a measuring device from the vibration behavior of the speed signal during the Reversierzyklus a dependent on the type of laundry and the amount of laundry loading stage of the filled into the drum laundry determined.

Eine von der Anmelderin hergestellte und vertriebene Waschmaschine W 487 WPS dreht die Trommel während des Waschprogrammabschnitts im Programm "Koch-/Buntwäsche" mit den aus der DE 39 33 355 A1 bekannten Drehzyklen und besitzt die aus der DE 100 05 991 A1 bekannte Gewichts-Messeinrichtung. Eine von der Anmelderin hergestellte und vertriebene Waschmaschine W 453 WPS dreht die Trommel ebenfalls während des Waschprogrammabschnitts im Programm "Koch-/Buntwäsche" mit den aus der DE 39 33 355 A1 bekannten Drehzyklen und besitzt die aus der DE 44 38 760 A1 bekannte Beladungsstufenerkennung.A manufactured and distributed by the applicant washing machine W 487 WPS rotates the drum during the wash program section in the program "Cottons" with the known from DE 39 33 355 A1 rotation cycles and has the well-known from DE 100 05 991 A1 weight measuring device , A washing machine W 453 WPS manufactured and sold by the applicant also rotates the drum during the wash program section in the program "Cottons" with the rotary cycles known from DE 39 33 355 A1 and has the loading stage recognition known from DE 44 38 760 A1.

Aus der DE 100 14 718 A1 ist ein Wäschetrockner mit einer Einrichtung zur Erfassung des von der eingefüllten Wäsche abhängigen Bewegungsverhaltens der Wäsche in der Trommel bekannt. Der Wäschetrockner weist eine Steuereinrichtung auf, die den Antriebsmotor für den Trommelantrieb in Abhängigkeit des Bewegungsverhaltens derart ansteuert, dass über die Trommeldrehzahl ein gewünschtes Bewegungsverhalten der Wäsche in der Trommel einstellbar ist. Hierbei soll die Wäsche in der Trommel im Verlauf des Trockenprozesses nach einer vorgebbaren Bewegungsbahn durch den erwärmten Trockenluftstrom geführt werden. Ein derartiger Trockner ist zum Trocknen von Wäscheposten mit großflächigen Warenbahnen, wie sie z. B. in Krankenhäusern anfallen, geeignet. Für das Trocknen von Haushaltswäscheposten ist die Drehzahlansteuerung des Trommelantriebsmotors in Abhängigkeit des Bewegungsverhaltens der Wäsche jedoch nicht geeignetFrom DE 100 14 718 A1 a tumble dryer with a device for detecting the dependent on the filled laundry movement behavior of the laundry in the drum is known. The tumble dryer has a control device which controls the drive motor for the drum drive as a function of the movement behavior such that a desired movement behavior of the laundry in the drum is adjustable via the drum speed. Here, the laundry in the drum in the course of the drying process after a predetermined trajectory through the heated dry air stream to be performed. Such a dryer is for drying laundry items with large webs, as z. B. incurred in hospitals, suitable. For the drying of household laundry items, however, the speed control of the drum drive motor depending on the movement behavior of the laundry is not suitable

Aus der JP 11 057 297 A (Patent Abstracts of Japan) ist ein Wäschetrockner bekannt, bei dem die Beladungsmenge mit Hilfe einer Elektrode und einer Auswerteschaltung erfasst wird. Abhängig von der Beladungsmenge wird die Drehbewegung der Trommel beeinflusst, insbesondere die Drehzahl und die Anzahl der Umdrehungen im Normal- und Reversierzyklus.JP 11 057 297 A (Patent Abstracts of Japan) discloses a tumble dryer in which the loading quantity is detected by means of an electrode and an evaluation circuit. Depending on the loading quantity, the rotational movement of the drum is influenced, in particular the speed and the number of revolutions in the normal and reversing cycle.

Der Erfindung stellt sich somit das Problem, ein Verfahren zur Steuerung der Trommeldrehzahl einer programmgesteuerten Wäschebehandlungsmaschine der eingangs genannten Art zu offenbaren, bei dem die mechanische Einwirkung auf die Wäsche im Waschprozess verbessert wird oder eine gleichmäßige Durchströmung der Wäsche im Trockenprozess ermöglicht wird.The invention thus presents the problem to disclose a method for controlling the drum speed of a program-controlled laundry treatment machine of the type mentioned, in which the mechanical action on the laundry is improved in the washing process or a uniform flow through the laundry in the dry process is made possible.

Erfindungsgemäß wird dieses Problem durch ein Verfahren zur Steuerung der Trommeldrehzahl einer programmgesteuerten Wäschebehandlungsmaschine mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.According to the invention, this problem is solved by a method for controlling the drum speed of a program-controlled laundry treatment machine having the features of patent claim 1. Advantageous embodiments and further developments of the invention will become apparent from the following subclaims.

Ein Ausführungsbeispiel der Erfindung ist anhand einer Zeichnung rein schematisch dargestellt und wird nachfolgend näher beschrieben. Die Figur zeigt ein Drehzahl-Zeit-Diagramm für zwei Drehzyklen im Reversierbetrieb bei unterschiedlichen Beladungsstufen.An embodiment of the invention is shown purely schematically with reference to a drawing and will be described in more detail below. The figure shows a speed-time diagram for two cycles in reversing at different loading levels.

Der Aufbau einer Waschmaschine zur Durchführung des erfindungsgemäß ausgebildeten Waschverfahrens ist beispielsweise aus der DE 100 05 991 A1 bekannt und deshalb hier nicht näher dargestellt. Sie besitzt einen Laugenbehälter, in dem eine Trommel zur Aufnahme von Wäsche um eine horizontale Achse drehbar gelagert ist. Die Drehung der Trommel erfolgt über einen Antriebsmotor. Der Laugenbehälter ist an Federn schwingbeweglich im Gehäuse aufgehängt und wird zur Dämpfung dieser Schwingungen im unteren Bereich durch Stoßdämpfer gegenüber dem Gehäuseboden abgestützt.The structure of a washing machine for carrying out the washing process designed according to the invention is known for example from DE 100 05 991 A1 and therefore not shown here in detail. It has a tub in which a drum for receiving laundry is rotatably mounted about a horizontal axis. The rotation of the drum via a drive motor. The tub is suspended on springs swinging in the housing and is supported for damping these vibrations in the lower area by shock absorbers against the housing bottom.

Zur Steuerung der verschiedenen Waschprogramme ist eine Mikroprozessor-Steuerung vorgesehen, die über Signalleitungen mit verschiedenen Messgebern und den Bedienelementen verbunden ist. Sie gibt zeit- und zustandsabhängige Befehle über Steuerleitungen an verschiedene Aktoren weiter und fungiert so als Steuereinrichtung für die Einstellung des Antriebsmotors auf unterschiedliche Drehzahlen. So wird beispielsweise innerhalb eines Waschprogrammabschnitts die Trommel reversierend gedreht, wobei zwischen den einzelnen Drehzyklen jeweils Pausenzeiten angeordnet sind. Das dabei verwendetet Drehzahlprofil wird an späterer Stelle beschrieben.To control the various washing programs a microprocessor control is provided, which is connected via signal lines with different encoders and the controls. It passes time and status-dependent commands via control lines to different actuators and thus acts as a control device for setting the drive motor to different speeds. Thus, for example, within a washing program section, the drum is reversely rotated, with pause times being arranged between the individual rotating cycles. The speed profile used will be described later.

Unter den Messgebern der Waschmaschine befindet sich ein Gewichtssensor, mit dem die Beladungsmenge der Trommel ermittelt werden kann. Als Sensor wird ein parallel zum Stoßdämpfer angeordneter Wegsensor verwendet, mit welchem die gewichtsabhängige Laugenbehälter-Höhenlage erfasst wird. Andere Gewichtssensoren, beispielsweise Dehnungsmessstreifen, können ebenfalls verwendet werden. Aus dem statischen Anteil des Wegsensor-Signals wird von der Mikroprozessor-Steuerung eine Beladungsstufe Bs ermittelt und in einem Speicher abgelegt, die dem Gewicht der in die Trommel eingefüllten Wäschemenge entspricht.Among the encoders of the washing machine is a weight sensor, with which the loading amount of the drum can be determined. The sensor used is a displacement sensor arranged parallel to the shock absorber, with which the weight-dependent tub container altitude is detected. Other weight sensors, such as strain gauges, may also be used. From the static portion of the displacement sensor signal from the microprocessor controller, a loading stage B s is determined and stored in a memory which corresponds to the weight of the filled into the drum amount of laundry.

Alternativ zu dem Gewichtssensor kann ein aus der DE 44 38 760 A1 bekanntes Verfahren zur Ermittlung einer von der Wäscheart und der Wäschemenge abhängigen Beladungsstufe Bs angewendet werden, bei dem eine in der Mikroprozessor-Steuerung integrierte Auswerteschaltung die Beladungsstufe in Abhängigkeit vom Schwingungsverhalten des Drehzahlsignals während des Drehzyklus in einem ersten Programmabschnitt, insbesondere im Vorwaschprogramm oder im Hauptwaschprogramm bestimmt.As an alternative to the weight sensor, a method known from DE 44 38 760 A1 can be used for determining a loading stage B s dependent on the type of laundry and the amount of laundry in which an evaluation circuit integrated in the microprocessor control controls the loading stage as a function of the vibration behavior of the speed signal the turning cycle in a first program section, in particular in the pre-wash program or in the main wash program determined.

Nach dem Sensieren der Beladungsstufe durch den Gewichtssensor oder die Auswerteschaltung werden die Drehzyklen innerhalb des Waschprogrammabschnitts auf die in der Trommel vorhandene Wäschemenge angepasst. Hierzu setzt die Mikroprozessor-Steuerung als Steuereinrichtung für die Einstellung des Antriebsmotors in Abhängigkeit von dem abgespeicherten Beladungsstufenwert Bs einen unteren Drehzahlwert nmin und einen oberen Drehzahlwert nmax als Grenze für die Waschdrehzahl fest, wie in der nachfolgenden Tabelle aufgelistet: Beladungsstufe Bs minimale Drehzahl nmin oberer Drehzahlwert nmax 1 kg 40 min-1 50 min-1 2 kg 40 min-1 55 min-1 3 kg 35 min-1 60 min-1 4 kg 30 min-1 70 min-1 5 kg 30 min-1 80 min-1 Der Drehzahlbereich, der so abhängig von der Beladungsstufe festgelegt worden ist, wird in der in der Figur dargestellten Trapezform durchfahren. Alternativ kann als Drehzahlprofil eine aufsteigende oder absteigende Rampe oder eine Dachform verwendet werden.After sensing the loading stage by the weight sensor or the evaluation circuit, the rotation cycles within the wash program section are adjusted to the amount of laundry present in the drum. For this purpose, the microprocessor control sets as control device for the adjustment of the drive motor in response to the stored loading level value B s a lower speed value n min and an upper speed value n max as the limit for the washing speed, as listed in the table below: Loading level B s minimum speed n min upper speed value n max 1 kg 40 min -1 50 min -1 2 kg 40 min -1 55 min -1 3 kg 35 min -1 60 min -1 4 kg 30 min -1 70 min -1 5 kg 30 min -1 80 min -1 The speed range, which has been determined as a function of the loading stage, is traversed in the trapezoidal shape shown in the figure. Alternatively, an ascending or descending ramp or roof shape can be used as the speed profile.

Durch die erfindungsgemäße Ausbildung des Verfahrens wird berücksichtigt, dass die Wäsche sich in mehreren Ebenen mit unterschiedlichen Radien am Trommelumfang verteilt, wobei die Anzahl der Ebenen von der Beladungsmenge abhängig ist. Jede Ebene wird durch die beladungsabhängige Variation der Drehzahl innerhalb eines Drehzyklus optimal angeregt. Bei sehr geringen Beladungen wird ein niedriger Drehzahlwert und eine geringe Bandbreite eingesetzt, um sicherzustellen, dass sich die Wäsche vom Trommelmantel löst und trotzdem eine hohe Waschmechanik erzielt wird. Das Drehzahlprofil besitzt dadurch die Form eines relativ flachen Trapezes (s. I). Bei mittleren Beladungen kann der Drehzahlbereich bis 60 min-1 erweitert werden, da ein Anlegen der Wäsche erst oberhalb dieses Werts stattfindet (s. Trapezform II). Bei hohen Beladungsmengen ist eine große Bandbreite des Drehzahlbereichs notwendig, da die Wäsche in der Trommel in mehreren Ebenen übereinanderliegt und deshalb die Fliehkraft innerhalb dieser Ebenen sehr stark variiert (s. Trapezform III). Durch die Steigerung der Drehzahlen von 30 min-1 auf 80 min-1 wird erreicht, dass zunächst die Wäsche im äußeren Bereich stark bewegt wird. Nach Erhöhung der Drehzahl legt sich diese an den Trommelmantel an, die weiter innen platzierte Wäsche wird bis in die 12-Uhr-Position angehoben und hat außerdem durch das Anlegen der äußeren Wäsche mehr Platz zum Fallen. Durch eine weitere Drehzahlsteigerung setzt sich dieser Effekt bis ins Trommelinnere fort. Anschließend wird durch das Verringern der Drehzahlen die äußere Wäsche wieder vom Trommelmantel abgelöst.The inventive design of the method takes into account that the laundry is distributed in several planes with different radii on the drum circumference, wherein the number of levels depends on the load. Each level is optimally excited by the load-dependent variation of the speed within a turning cycle. At very low loads, a low RPM value and low bandwidth is used to ensure that the laundry is released from the drum shell while still achieving a high level of washing mechanics. The speed profile thus has the form of a relatively flat trapezium (see I). For medium loads, the speed range can be extended up to 60 min -1 , since the application of the wash only takes place above this value (see trapezoidal shape II). At high loadings, a large bandwidth of the speed range is necessary because the laundry in the drum in several levels on top of each other and therefore the centrifugal force varies very widely within these levels (see trapezoidal shape III). By increasing the speeds from 30 min -1 to 80 min -1 it is achieved that first the laundry is moved strongly in the outer area. After increasing the speed, this will be applied to the drum shell, the laundry placed further inside will be raised to the 12 o'clock position and will also have more room to fall through the application of the outer laundry. By further increasing the speed, this effect continues into the interior of the drum. Subsequently, by reducing the rotational speeds, the outer laundry is detached again from the drum shell.

Der Wäschetrockner zur Durchführung des erfindungsgemäß ausgebildeten Trockenverfahrens besitzt eine drehbar gelagerte Trommel zur Aufnahme von Wäsche sowie ein Gebläse zur Förderung der mittels Heizeinrichtung erwärmten Trocknungsluft durch die Trommel. Die Drehung der Trommel erfolgt über einen Antriebsmotor in wechselnden Drehrichtungen. Der Wäschetrockner ist außerdem mit einer Einrichtung zur Erfassung und Auswertung des Restfeuchtegehaltes in der Wäsche sowie der Beladungsmenge ausgebildet.The tumble dryer for carrying out the inventively designed drying process has a rotatably mounted drum for receiving laundry and a fan for Promotion of heated by means of heating drying air through the drum. The drum is rotated by a drive motor in alternating directions of rotation. The tumble dryer is also designed with a device for detecting and evaluating the residual moisture content in the laundry and the load.

Zur Steuerung der verschiedenen Trockenprogramme für unterschiedliche Beladungsarten ist eine Mikroprozessor-Steuerung vorgesehen, die über Signalleitungen mit verschiedenen Messgebern und den Bedienelementen verbunden ist. Sie gibt zeit- und zustandsabhängige Befehle über Steuerleitungen an verschiedene Aktoren weiter und fungiert so als Steuereinrichtung für die Einstellung des Antriebsmotors auf unterschiedliche Drehzahlen. So wird beispielsweise auch innerhalb eines Trockenprogrammabschnitts die Trommel reversierend gedreht, wobei zwischen den einzelnen Drehzyklen jeweils Pausenzeiten angeordnet sind.To control the various drying programs for different loading types, a microprocessor control is provided, which is connected via signal lines with different encoders and the operating elements. It passes time and status-dependent commands via control lines to different actuators and thus acts as a control device for setting the drive motor to different speeds. Thus, for example, the drum is rotated reversing within a dry program section, with pause times are arranged between each rotation cycles.

Nach dem Sensieren der Beladungsmenge und/oder des Restfeuchtegehaltes werden die Drehzyklen innerhalb des Trockenprogrammabschnitts auf die in der Trommel vorhandene Beladungsmenge und/oder erreichte Restfeuchte in der Wäsche angepasst. Hierzu setzt die Mikroprozessor-Steuerung als Steuereinrichtung für die Einstellung des Antriebsmotors in Abhängigkeit von den trocknerspezifisch abgespeicherten Beladungsmengen und Restfeuchtestufen einen unteren Drehzahlwert nmin und einen oberen Drehzahlwert nmax als Grenze für die Trockendrehzahl fest.After sensing the loading amount and / or the residual moisture content, the rotation cycles within the drying program section are adjusted to the loading quantity present in the drum and / or the residual moisture in the laundry. For this purpose, the microprocessor control sets as a control device for the adjustment of the drive motor in response to the dryer-specific stored load levels and residual moisture levels a lower speed value n min and an upper speed value n max as the limit for the dry speed.

Das dabei verwendetet Drehzahlprofil entspricht dem Profil, welches bereits für den Waschprozess ausführlich beschrieben ist.The speed profile used here corresponds to the profile which has already been described in detail for the washing process.

Das beschriebene Verfahren ist insbesondere beim Waschen und Trocknen von Textilien aus Baumwolle, d. h. in einem "Koch-/Buntwäsche-Programm" vorteilhaft, da dort große Textilmengen in die Trommel gefüllt werden. Es kann zweckmäßig sein, die vorbeschriebenen Drehzahlprofile auch im Spülprogrammabschnitt zu verwenden, da hierdurch eine bessere Durchmischung mit Spülwasser stattfindet und so die Spülwirkung verbessert wird.The process described is particularly useful in the washing and drying of cotton textiles, i. H. in a "cooking / color wash program" advantageous because there large quantities of fabric are filled in the drum. It may be expedient to use the above-described speed profiles also in the rinse program section, since this results in a better mixing with rinse water and thus the rinsing effect is improved.

Claims (7)

  1. Method of controlling the drum rotational speed of a program-controlled laundry treating machine, such as a washing machine, washer-dryer or laundry dryer, having a drum which is rotatable about a horizontal or approximately horizontal axis, a driving motor for the drum, a measuring means for determining a load parameter which is dependent on the quantity of laundry introduced into the drum, and a control means for setting the driving motor to various rotational speeds in different steps of a washing or drying program in such a manner that, during a washing or drying program step, individual rotational cycles are carried out with pauses interspersed therebetween, the drum being driven during one rotational cycle at different rotational speeds, which lie between a lower rotational speed value and an upper rotational speed value, and the direction of rotation remaining the same during one rotational cycle, characterised in that the control means sets the lower and the upper rotational speed values, in dependence on the load parameter determined with the measuring means, in such a manner that, in the case of a heavy load, the rotational speed range between the lower rotational speed value and the upper rotational speed value has a broader band width than in the case of a light load.
  2. Method according to claim 1, characterised in that the rotational cycle begins with the lower rotational speed value.
  3. Method according to claim 2, characterised in that the rotational speed-time profile of a rotational cycle uses an ascending or descending incline or has a trapezoidal configuration.
  4. Method according to at least one of claims 1 to 3, characterised in that the lower rotational speed value is varied between 30 min-1 and 40 min-1, depending on the load.
  5. Method according to at least one of claims 1 to 4, characterised in that the upper rotational speed value is varied between 50 min-1 and 80 min-1, depending on the load.
  6. Method according to one of claims 1 to 5, characterised by its use in a washing program for washing laundry suitable for boiling and coloured laundry.
  7. Method according to one of claims 1 to 5, characterised by its use in a drying program for drying laundry suitable for boiling and coloured laundry.
EP03006976A 2002-04-16 2003-03-27 Method to control the drum rotating speed of a program controlled machine for treating clothes Expired - Lifetime EP1354997B1 (en)

Applications Claiming Priority (2)

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DE10217009 2002-04-16
DE10217009A DE10217009C1 (en) 2002-04-16 2002-04-16 Washing method, for program-controlled washing machine, has rev range for each rotation cycle determined in dependence on washing load

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EP1354997B1 true EP1354997B1 (en) 2006-08-16

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EP2075362A1 (en) 2007-12-27 2009-07-01 Electrolux Home Products Corporation N.V. Improvements in a clothes washing and drying machine

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KR100498316B1 (en) * 2003-02-14 2005-07-01 엘지전자 주식회사 Method for washing in drum washing machine
DE102007057331A1 (en) * 2007-11-28 2009-06-04 BSH Bosch und Siemens Hausgeräte GmbH Method and device for determining the optimum rotational speed of the drum of a laundry treatment device
US8578532B2 (en) 2009-07-22 2013-11-12 Whirlpool Corporation Laundry treating appliance with controlled mechanical energy
US8819880B2 (en) * 2011-12-21 2014-09-02 Whirlpool Corporation Efficient energy usage for a laundry appliance

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EP2075362A1 (en) 2007-12-27 2009-07-01 Electrolux Home Products Corporation N.V. Improvements in a clothes washing and drying machine

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ATE336612T1 (en) 2006-09-15
ES2266664T3 (en) 2007-03-01
EP1354997A1 (en) 2003-10-22
DE50304627D1 (en) 2006-09-28
DE10217009C1 (en) 2003-10-16

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