WO2010072649A1 - Procédé pour prédire un défaut d'équilibrage, dispositif correspondant et appareil ménager équipé d'un tel dispositif - Google Patents

Procédé pour prédire un défaut d'équilibrage, dispositif correspondant et appareil ménager équipé d'un tel dispositif Download PDF

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Publication number
WO2010072649A1
WO2010072649A1 PCT/EP2009/067427 EP2009067427W WO2010072649A1 WO 2010072649 A1 WO2010072649 A1 WO 2010072649A1 EP 2009067427 W EP2009067427 W EP 2009067427W WO 2010072649 A1 WO2010072649 A1 WO 2010072649A1
Authority
WO
WIPO (PCT)
Prior art keywords
imbalance
control variable
tub
laundry
predicting
Prior art date
Application number
PCT/EP2009/067427
Other languages
German (de)
English (en)
Inventor
Steffen Udluft
Peter Blauert
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to PL09799335T priority Critical patent/PL2379788T3/pl
Priority to EP09799335A priority patent/EP2379788B1/fr
Publication of WO2010072649A1 publication Critical patent/WO2010072649A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/16—Imbalance
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/48—Preventing or reducing imbalance or noise
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/26—Imbalance; Noise level

Definitions

  • the present invention relates to a method for predicting or occurring in a drum of a household appliance for the care of laundry caused by a distribution of the laundry items in an interior of the drum caused imbalance, wherein the predictions in a lower value range of a speed, in particular in a Laundry distribution operation is performed, and a value and / or a course of the imbalance for an upper value range of the speed, in particular for a centrifugal operation, is determined.
  • the present invention relates to a corresponding device for predicting an unbalance or a household appliance with such a device.
  • Washing machines usually have an electronically controlled drive. Before a transition to a so-called spin operation, a drum is accelerated over a fixed slow laundry distribution operation and an unbalance estimated. In this case, the estimation of the unbalance usually takes place via an engine speed or a loading of the drum. It is always possible to cancel the spin mode or to influence the further spin cycle.
  • methods are known from the prior art in many ways, in which the unbalance is determined from a speed or current profile.
  • it is known to carry out a correction of the measured value of the imbalance with respect to the laundry load wherein the laundry load was determined once before or at the beginning of a spin cycle.
  • a method for predicting an imbalance forming during the spinning of laundry is known from DE 10 2006 032 337 A1.
  • the amplitude of the movement of a spring-supported tub of a washing machine and the speed of a laundry drum arranged in the tub during a spin cycle is determined. From the amplitude of movement and the drum speed, the change in amplitude over the speed is also determined and the further spin cycle in dependence of this controlled amplitude change controlled.
  • extrapolation is made from the determined values for the rotational speed, the amplitude and the amplitude change for a possible rotational speed of the further spin cycle.
  • the object of the present invention is to propose a method and a device or a household appliance with such a device, which ensure an early and reliable predictions of imbalance.
  • An inventive method is for predicting or predicting occurring in a drum of a household appliance for the care of laundry, by a distribution of laundry items designed in an interior of the drum caused imbalance.
  • the prediction is carried out in a lower value range of a rotational speed, in particular in a laundry distribution mode, and a value and / or a progression of the imbalance is determined for an upper value range of the rotational speed, in particular for a centrifugal operation.
  • An essential idea of the invention is that the imbalance is predicted as a function of a measurement and / or control variable, wherein a behavior of movement of a vibration system of the household appliance is characterized by the measurement and / or control variable.
  • the term household appliance is understood here in particular a washing machine.
  • the term also includes other household appliances for the care of laundry items, such as a dryer or a washer-dryer.
  • a basic idea of the present invention is to predict the imbalance on the basis of a measurement and / or control quantity which characterizes a change in weight of wet laundry items during a spin operation or drainage.
  • an amplitude of the measured and / or control variable preferably an average amplitude
  • the prediction or prediction is preferably dependent on the determined amplitude and the rotational speed is made.
  • the lower value range of the rotational speed, in which the prognosis of the imbalance is performed on the basis of a course of the measured and / or control variable, in particular a curve of the average amplitude, selected in dependence of the rotational speed, and resonances occurring in this course preferably considered.
  • the measurement of the amplitude of the measured and / or control variable takes place at a speed of about 235 revolutions per minute, whereby the forecast of the imbalance can be improved.
  • a very reliable prediction of the imbalance for the upper value range of the rotational speed, in particular for the centrifugal operation can be made and the imbalance can be determined.
  • the spin time can be saved, since an optimum spin cycle or an improved control of the rotational speed can be carried out early.
  • a path signal is selected as the measurement and / or control variable, which characterizes a deflection of a tub of the household appliance from a rest position.
  • the path signal is generated by means of a displacement sensor, which is preferably arranged in a spring piston damper of the tub.
  • deflection of the tub is understood in particular an amplitude with which the tub swings to a rest position.
  • an average amplitude of the path signal over at least half a period, in particular over one to three periods, is determined for predicting the imbalance, wherein the average amplitude is preferably determined from a distance between an upper and a lower envelope of the course of the path signal.
  • an imbalance mass directly as a function of the deflection of the tub, in particular as a function of the average amplitude of the path signal can be determined.
  • the imbalance or the deflection of the tub from the rest position for this value of the speed predict.
  • the imbalance is then in particular a measure of the imbalance occurring in the centrifugal operation.
  • a jump behavior of a profile of the measured and / or control variable, in particular of a path signal is filtered.
  • jumps of an average of the measured and / or control variable, in particular a sudden behavior of a rest position of the tub are filtered.
  • the rest position of the tub changes partially leaps and bounds. These jumps are not a consequence of a change in weight of the laundry items or a drainage, but result from a sudden change in position of a friction element within the spring piston damper.
  • These jumps are preferably removed by means of a suitable filter from the course of the measured and / or control variable, in particular the path signal. This ensures that the imbalance can be determined more accurately.
  • the measurement and / or control variable, in particular a path signal from a time of a first complete emptying of a tub of the household appliance is observed.
  • a correction value of a dehydration is determined, and the imbalance determined in advance is corrected by the determined correction value, in particular is corrected additively.
  • a compensation function is determined, by means of which a value of a residual drainage is extrapolated to spin operation.
  • the compensation function preferably has an exponential component.
  • the correction value is limited to a value range of about -0.05 mm to about 0.7 mm.
  • dewatering means, in particular, a dispensing of water and a compression of the items of laundry.
  • a possible error of the unbalance forecast can be justified such that at large loadings of the drum an end imbalance by dispensing water and compression of the laundry or by the drainage is smaller, with the rule that the smaller the load of the drum, the weaker this Effect is.
  • the correction of the drainage is particularly advantageous.
  • a loading state of the drum is preferably determined.
  • the correction value of the drainage by which the predicted imbalance is corrected depending on a slope of an average of the measured and / or control variable and / or a sum of squares of a change in the mean of the measured and / or control variable compared to a previous rotation of the drum and / or extrapolated residual drainage.
  • a device according to the invention is designed for predicting or forecasting an imbalance occurring in a drum of a domestic appliance for the care of items of laundry caused by a distribution of the items of laundry in an interior space of the drum.
  • the device comprises an imbalance prediction device, by means of which the predictions in a lower value range of a speed, in particular in a laundry distribution operation, feasible, and a value and / or a course of imbalance for an upper value range of the speed, in particular for a spin operation, can be determined.
  • the imbalance prediction device is designed for predicting the imbalance as a function of a measurement and / or control variable, which is a change in a weight of wet items during a spin operation or a drainage.
  • a movement behavior of a vibration system of the household appliance can also be characterized by the measurement and / or control variable.
  • Advantageous embodiments of the method according to the invention are to be regarded as advantageous embodiments of the device according to the invention.
  • the method steps at the same time define means for performing the method steps, wherein the devices can be comprised by or connected to the device for predicting an imbalance.
  • FIG. 1 shows a course of a rotational speed and a course of a travel signal of a tub over time.
  • Fig. 2 shows a comparison of an imbalance forecast at two different loads one
  • Rotation speed shows an exemplary course of a relative change in the rest position of the tub for explaining a determination of a compensation function
  • Fig. 5 is a schematic representation of a washing machine.
  • a washing machine which has in a housing 1 a suspended on springs 8 tub 3 with a rotatably mounted drum 2 therein.
  • a balance weight 10 is attached at the tub 3, a balance weight 10 is attached.
  • the drum 2 is driven by a motor 5 via a belt 4.
  • a damper 6 of the tub 3 a not shown displacement sensor is arranged in the present example, which is able to detect a deflection of the tub 3 from a rest position, and to generate a signal characterizing this deflection.
  • the damper is designed as a so-called spring piston damper 6.
  • dampers with an associated displacement sensor which detects the movement of the damper
  • this signal is referred to as a path signal.
  • the invention also includes alternative arrangements of the sensor, if such a sensor can detect a movement of the tub 3 relative to the housing 1.
  • the household appliance comprises a controller 9, which are electrically connected to electrical consumers, such as the motor 5, and measuring devices, such as the displacement sensor.
  • the controller 9 is designed so that the control signals required for operating the household appliance are generated and that the signals detected by the measuring devices can be evaluated by means encompassed by the controller.
  • a controller 9 may itself comprise the device for predicting the unbalance caused in the drum 2 or be connected to such a device.
  • the controller 9 generate control signals that affect the further program flow, in particular the centrifugal operation with respect to the control and / or regulation of the speed of Drum 2.
  • a reduction of a drum speed when exceeding a predetermined unbalance limit for the determined imbalance E 8 oo P possible to avoid excessive movements of the tub 3 and excessive mechanical loads.
  • the interest applies to predicting or predicting an imbalance occurring in the drum 2 of the household appliance, caused by a distribution of the laundry items 7 in an interior of the drum 2.
  • the prediction of the imbalance takes place in a lower value range of a rotational speed n of the drum 2, in the present example in a laundry distribution operation of the washing machine.
  • a value or a course of the imbalance for an upper value range of the rotational speed n is determined in the present case.
  • the upper value range of the rotational speed n is understood to mean a centrifugal operation of the washing machine, which is carried out during a washing process, in particular after the laundry distribution operation.
  • the household appliance in the present case comprises a displacement sensor, which is preferably mounted in a spring piston damper 6 of a liquor container 3 arranged in the household appliance.
  • the displacement sensor may alternatively be provided an acceleration sensor.
  • the displacement sensor has the task to detect a deflection of the tub 3 from a rest position, and then to generate a displacement signal characterizing this deflection.
  • the path signal is used for predicting or predicting the imbalance caused by the distribution of the laundry items 7 in the drum 2.
  • FIG. 1 shows an example course of a rotational speed n (top) as well as a course of a travel signal W indicated underneath and associated with the rotational speed n.
  • the path signal W corresponds to a deflection of the tub 3 from a rest position.
  • an actual amplitude from the path signal W of a last drum revolution is initially calculated in the present case.
  • the amplitude of the Path signal W has an asymptotic course from a certain speed of about 800 revolutions per minute, in the present case is of particular interest to predict the imbalance occurring at this speed of about 800 revolutions per minute.
  • On the unbalance occurring in the spin mode can then be closed directly from the determined for the speed of 800 revolutions per minute unbalance.
  • the speed selected for this embodiment of 800 revolutions per minute depends on device-specific parameters. The speed is selected to be well above the resonance speed.
  • the imbalance E 80O occurring at the speed of 800 revolutions per minute, and thus in the centrifugal operation can be predicted at any desired speed n from the current amplitude of the path signal W.
  • a profile of the amplitude of the path signal W as a function of the rotational speed n it can be determined that a first resonance occurs at a rotational speed n of approximately 190 to 200 revolutions per minute. Below the first resonance speed, a large prognosis error can be ascertained, whereby the prediction of the imbalance E 8 oo drastically improves the prognosis at a speed n of approximately 235 revolutions per minute.
  • FIG. 2 shows a comparison of a predicted imbalance E 8 oo p and a measured imbalance E 8 OOg at a speed of about 800 revolutions per minute.
  • the comparison for a large load of the drum 2 and the right for a small loading of the drum 2 is shown on the left.
  • the predicted value of the unbalance E 8O o p at the large loading of the drum 2 shows a good agreement with the measured value of the imbalance E 8009 .
  • the predicted value of the imbalance E 800p shows smaller scattering for smaller loads of the drum 2, but a systematic underestimation of the actual imbalance E 80O9 . This can be seen on the right in FIG. This systematic deviation increases with decreasing load.
  • the path signal W has a vibration about an average value, wherein the mean value corresponds to a rest position of the tub 3. As shown in Fig. 1, this rest position changes with time t, which is due to the dispensing of water and the compression of the laundry items 7 and to the drainage.
  • Fig. 3 shows gradients of a change in the rest position M of the tub 3 and curves of the speed n as a function of the number s of the drum revolutions for a small (left) and a large (right) loading of the drum 2 again.
  • the upper curves each show a course of change in the rest position M of the tub 3 versus the number s of drum revolutions
  • the middle curves each show a course of the relative change in the rest position M of the tub 3.
  • the lower curves each represent a curve of the rotational speed n versus the number s of the drum revolutions.
  • the measurement and the observation of the path signal W begin at a time of a first complete emptying of the tub 3 and the beginning of a laundry dehumidification by means of rotational movement. From this point on, the relative change of the rest position M of the tub 3 is observed. During the observation, a compensation function is determined continuously or sequentially, whereby a residual dewatering is extrapolated to the spin operation on the basis of the compensation function.
  • the compensation function is determined according to the following formula:
  • ki, k 2 , k 3 designate parameters which are adapted to the above formula.
  • s denotes the number of drum revolutions since the start of laundry dehydration.
  • the predicted value of the imbalance E 8 oo P is corrected additively by the correction value of the drainage.
  • the correction value of the drainage can be limited to a specific interval, for example from -0.05 to 0.7 mm. In the present case, it should be mentioned that the correction value depends on the extrapolated residual drainage, a slope of a linear compensation function (ki + k 2 s) and a sum of the
  • Adapted network with three input nodes and an output node, wherein the neural network, a transfer function and three weights are assigned.

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

Abstract

L'invention concerne un procédé pour prédire un défaut d'équilibrage (E800p) provoqué par la répartition du linge (7) dans l'espace intérieur du tambour (2) d'un appareil ménager destiné à l'entretien du linge (7). Selon ce procédé, la prédiction s'effectue dans une plage de valeurs inférieure d'une vitesse de rotation (n), en particulier pendant l'exécution de la fonction de répartition de linge, et une valeur et/ou une courbe du défaut d'équilibrage (E800p) sont/est déterminée(s) pour une plage de valeurs supérieure de la vitesse de rotation (n = 800 tr/min), en particulier pour une fonction d'essorage, le défaut d'équilibrage (E800p) étant prédit en fonction d'une grandeur de mesure et/ou de commande (W) qui caractérise le comportement cinétique d'un système oscillant de l'appareil ménager.
PCT/EP2009/067427 2008-12-22 2009-12-17 Procédé pour prédire un défaut d'équilibrage, dispositif correspondant et appareil ménager équipé d'un tel dispositif WO2010072649A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL09799335T PL2379788T3 (pl) 2008-12-22 2009-12-17 Sposób przewidywania niewyważenia, odpowiednie urządzenie i sprzęt gospodarstwa domowego z takim urządzeniem
EP09799335A EP2379788B1 (fr) 2008-12-22 2009-12-17 Procédé pour prédire un défaut d'équilibrage, dispositif correspondant et appareil ménager équipé d'un tel dispositif

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008055092.2 2008-12-22
DE102008055092A DE102008055092A1 (de) 2008-12-22 2008-12-22 Verfahren zum Vorhersagen einer Unwucht, entsprechende Vorrichtung und Haushaltsgerät mit einer solchen Vorrichtung

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WO2010072649A1 true WO2010072649A1 (fr) 2010-07-01

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PCT/EP2009/067427 WO2010072649A1 (fr) 2008-12-22 2009-12-17 Procédé pour prédire un défaut d'équilibrage, dispositif correspondant et appareil ménager équipé d'un tel dispositif

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EP (1) EP2379788B1 (fr)
DE (1) DE102008055092A1 (fr)
PL (1) PL2379788T3 (fr)
WO (1) WO2010072649A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11459684B2 (en) * 2019-08-05 2022-10-04 Lg Electronics Inc. Washing machine and a control method of the same
US11466388B2 (en) * 2019-08-05 2022-10-11 Lg Electronics Inc. Washing machine and a control method of the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010042173A1 (de) * 2010-10-07 2012-04-12 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Tarieren eines Wegsensors für die Beladungs-Messung und zum Berechnen der Trockenmasse eines Wäschepostens in einer Trommelwaschmaschine
DE102014204079A1 (de) * 2014-03-06 2015-09-10 BSH Hausgeräte GmbH Verfahren zum Bestimmen eines Beladungsgewichts eines schwingenden Systems eines Haushaltsgeräts zur Pflege von Wäschestücken und Haushaltsgerät

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738310A1 (de) * 1997-09-02 1999-03-04 Aeg Hausgeraete Gmbh Verfahren zum Ermitteln einer Umverteilung und damit einer Änderung einer Unwucht
WO2008006675A1 (fr) * 2006-07-12 2008-01-17 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour la commande du déroulement de l'essorage d'un lave-linge et lave-linge approprié pour l'exécution du procédé

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6715175B2 (en) * 2000-06-26 2004-04-06 Whirlpool Corporation Load unbalanced prediction method and apparatus in an appliance
KR20040059222A (ko) * 2002-12-28 2004-07-05 엘지전자 주식회사 세탁기의 탈수시 언밸런스 검출방법 및 그에 따른 세탁기운전 제어방법
KR100565203B1 (ko) * 2004-01-20 2006-03-30 엘지전자 주식회사 드럼 세탁기의 편심량 감지 장치

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738310A1 (de) * 1997-09-02 1999-03-04 Aeg Hausgeraete Gmbh Verfahren zum Ermitteln einer Umverteilung und damit einer Änderung einer Unwucht
WO2008006675A1 (fr) * 2006-07-12 2008-01-17 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour la commande du déroulement de l'essorage d'un lave-linge et lave-linge approprié pour l'exécution du procédé

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11459684B2 (en) * 2019-08-05 2022-10-04 Lg Electronics Inc. Washing machine and a control method of the same
US11466388B2 (en) * 2019-08-05 2022-10-11 Lg Electronics Inc. Washing machine and a control method of the same

Also Published As

Publication number Publication date
PL2379788T3 (pl) 2013-03-29
DE102008055092A1 (de) 2010-06-24
EP2379788A1 (fr) 2011-10-26
EP2379788B1 (fr) 2012-10-10

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