EP2094893B1 - Verfahren zur bestimmung des gewichts der last in einer waschmaschine mit trockner anhand der eigenfrequenzreaktion der beladenen trommel - Google Patents

Verfahren zur bestimmung des gewichts der last in einer waschmaschine mit trockner anhand der eigenfrequenzreaktion der beladenen trommel Download PDF

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Publication number
EP2094893B1
EP2094893B1 EP07822068A EP07822068A EP2094893B1 EP 2094893 B1 EP2094893 B1 EP 2094893B1 EP 07822068 A EP07822068 A EP 07822068A EP 07822068 A EP07822068 A EP 07822068A EP 2094893 B1 EP2094893 B1 EP 2094893B1
Authority
EP
European Patent Office
Prior art keywords
drum
control unit
natural frequency
values
load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07822068A
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English (en)
French (fr)
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EP2094893A2 (de
Inventor
M. Omer Akbas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arcelik AS
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Arcelik AS
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Publication date
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Publication of EP2094893A2 publication Critical patent/EP2094893A2/de
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Publication of EP2094893B1 publication Critical patent/EP2094893B1/de
Not-in-force legal-status Critical Current
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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
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/24—Spin speed; Drum movements
    • 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

Definitions

  • the present invention relates to a washer/dryer wherein the amount of laundry contained therein is detected.
  • the amount of the laundry (the load) emplaced in the drum by the user is the amount of the laundry (the load) emplaced in the drum by the user. If this load is known, then the amount of water and detergent to be used and the washing duration can be determined. Respectively the washing machine can be operated with the minimum amount of energy, water and detergent as possible.
  • various sensors are used for measuring the load embraced in the drum by the user.
  • an electrically insulated surface functioning as a capacitor between the drum and the body, is utilized as a load sensor.
  • the load is detected by looking at the speed profiles obtained during washing.
  • the amount of load is determined by rising and falling of the laundry while the drum rotates.
  • EP 0709512 A1 concerns a washing machine and a process for using the washing machine.
  • the washing machine comprises a rotating drum for the washing, a motor for driving the drum, and a device for the display of a rotation speed signal.
  • the loading stage is determined by an evaluator circuit in accordance with the vibration behaviour of the speed signal during the reversing cycle in a first program cycle.
  • An object of the present invention is to provide a method of controlling a washer/dryer wherein the amount of load in the drum is determined easily.
  • the object of the present invention is achieved by the method for controlling a washer/dryer according to claim 1.
  • the object of the present invention is also achieved by the methods for controlling a washer/dryer according to the dependent claims.
  • the drum is accelerated up to a speed that is greater than the angular speed corresponding to the estimated value of natural frequency.
  • the angular speed of the system corresponding to the natural frequency present in the load is measured by using the measurements received from the speed sensor utilized in measuring the motor speed. This value is compared with the natural frequency values for known loads measured and previously recorded in the control unit by the producer. As a result, the load amount corresponding to the said natural frequency is determined as the weight of the load contained in the drum.
  • the angular speed value corresponding to the natural frequency is detected by determining the angular speed wherein the difference between the minimum and maximum angular speed values is greatest that is realized during a full revolution with the data received from the speed sensor.
  • the greatest angular speed value to which drum should be accelerated for determining the load is decided by the producer as a result of a study made while the machine is empty.
  • the natural frequency value is greatest while laundry is not loaded in the machine. For this reason the angular speed value corresponding to the natural frequency determined by tests done while the machine is empty can be used together with a safety margin as the highest speed value to which the drum has to accelerate.
  • the load determining process is made while dry before receiving water.
  • the dry weight of the laundry can be determined more precisely.
  • a certain amount of water is received into the tub in order to prevent fraying of the laundry as a result of rotating at high speed.
  • This amount is preferably less than the water amount required for washing, just sufficient for reducing the friction between the drum and the clothes.
  • subtracting the weight of water received into the tub will be adequate.
  • the producer records the same values in the control unit of all the washer/dryers produced of a certain type.
  • the producer does not have to apply tests to every washer/dryer separately.
  • the natural frequency value reduction corresponding to a certain load value increase has been ascertained to be approximately the sane for the same type of machines.
  • the reduction quantity according to the natural frequency of the empty machine corresponding to the angular speed is the same.
  • the producer tests each washer/dryer separately and the machine specific values are recorded in the control unit of each washer/dryer. Consequently, the amount of laundry the user places in the drum can be measured more precisely taking into account the differences relating to production. The producer can measure these values during the speed tests currently applied to the machines.
  • Figure 1 - is the schematic view of a washer/dryer.
  • Figure 2 - is the graph of the angular speed - drum angle of a washer/dryer.
  • the washer/dryer (1) can be a washing machine used in cleaning laundry by washing with water, a dryer used for drying wet laundry or a washer-dryer that can perform both washing and drying.
  • the washer/dryer (1) functions according to a program.
  • the washer/diyer (1) basically comprises
  • the washer/dryer (1) is basically formed of two main groups.
  • the first is the tub group including the motor (5), transmission components such as the belt-pulley, the drum (4), the tub (3) and balance weights (not shown in the figures).
  • the second is the body group including the door, detergent dispenser, control panel, feet and the body (2).
  • the tub group and the body group are dynamically connected to each other by means of springs, dry friction shock absorbers and a viscoelastic bellows.
  • the producer places a known load (Li) into the drum (4) each time for determining the natural frequency (Wni) value generated under that load during the production of the washer/dryer (1).
  • the results are recorded in the control unit (6) as a table or as a function.
  • the drum (4) is accelerated in dry conditions before receiving water into the tub (3).
  • the amount of load (L) placed in the drum (4) can be directly calculated.
  • the drum (4) is accelerated while the laundry is wet after a certain amount of water is received into the tub (3).
  • the amount of water received into the tub (3) is preferably less than the amount required for the main washing.
  • the water amount is sufficient for reducing the friction between the laundry and the drum (4).
  • subtracting the weight of the water will suffice while calculating the amount of the laundry load (L).
  • the maximum value (Wm) to which the drum (4) will be accelerated is a constant value preset by the producer, in another embodiment, it is a value determined dynamically by the control unit (6).
  • the producer determines the highest speed value that the drum (4) should accelerate by adding a certain safety margin to the natural frequency that is assessed while the machine is empty.
  • the control unit (6) that records the natural frequency values realized in various operations determines a maximum angular speed corresponding to these. The control unit (6) in this way prevents the drum (4) from accelerating to very high speeds by determining a value according to the routines of the user.
  • the senor (7) is a tachogenerator having a revolution that can detect the variations in the angular speed (W) during a full revolution (2p) of the drum (4).
  • the sensor (7) can either be a tachogenerator included in the motor (5) or a specific tachogenerator for measuring the angular speed of the drum (4).
  • This tachogenerator can be a multi-pole, optical or magnetic tachogenerator. It is preferable that the tachogenerator has approximately 30-60 poles for effectively monitoring the speed changes during one full revolution.
  • the producer records the same values (Wi-Li) in the control unit (6), regarding the fact that the dynamic properties of washer/dryers (1) belonging to a certain series are similar hence possess proximate natural frequency values. Consequently, the producer does not have to apply tests to each washer/dryer (1) separately.
  • the producer records to the control unit (6) the load difference (DLi) and the corresponding angular speed difference (DWi) values wherein the natural frequency is observed.
  • the load difference (DLi) and the corresponding angular speed difference (DWi) values wherein the natural frequency is observed.
  • the angular speed value (Wn_e) corresponding to the natural frequency detected while the machine is empty should also be recorded in the control unit (6).
  • the producer records in the control unit (6) the values (Wi-Li) exclusive to the machine obtained from the test results by testing each washer/dryer (1) separately. Consequently, the amount of laundry (L) placed in the drum (4) by the user can be determined more precisely by tasking into account the differences of each machine and the variations due to the production.
  • the laundry load can be determined by using the data of the available speed sensors (7), without a dedicated sensor designed exclusively for this process. Consequently, contribution is provided for decreasing the costs.

Claims (9)

  1. Verfahren zum Steuern einer Wasch-/Trockenmaschine (1) die zum Reinigen der Wäsche durch Waschen oder zum Trocknen benutzt wird, umfassend einen Gehäusekörper (2), einen Laugenbehälter (3), der im Gehäusekörper (2) angeordnet ist, eine Trommel (4), die sich im Laugenbehälter (3) dreht, und in die die Wäsche (L) gegeben wird,
    einen Motor (5), der den erforderlichen Antrieb zum Drehen der Trommel (4) bereitstellt,
    einen Geschwindigkeitssensor (7), der die Winkelgeschwindigkeit der Trommel (4) und/oder des Motors (5) misst, und eine Steuereinheit (6), gekennzeichnet durch
    Aufzeichnen der natürlichen Frequenzwerte (Wni, i=1, ..., k), die einer Folge von bekannten Beladungsmengen (Li, i=1, ..., k) entsprechen, in der Steuereinheit (6) durch den Hersteller,
    Beschleunigen des Motors (5) auf eine höhere Drehzahl als die möglichen natürlichen Frequenzwerte durch die Steuereinheit (6), nachdem der Benutzer die Wäsche (L) in die Trommel (4) gegeben hat,
    gleichzeitiges Ermitteln des Winkelgeschwindigkeitwerts, der der natürlichen Frequenz (Wn) entspricht, durch die Steuereinheit (6), indem die momentanen Winkelgeschwindigkeitswerte (Wj) benutzt werden, die vom Geschwindigkeitssensor (7) gemessen werden, und
    Vergleichen dieses Wertes mit den Werten (Li-Wni; i=1, ..., k), die vom Hersteller im Voraus aufgezeichnet wurden, durch die Steuereinheit (6), um die Beladungsmenge (L) zu bestimmen.
  2. Verfahren zum Steuern nach Anspruch 1,
    gekennzeichnet durch
    eine Steuereinheit (6), die den Vorgang zum Bestimmen der Beladungsmenge durchführt, bevor Wasser in den Laugenbehälter (3) gelangt.
  3. Verfahren zum Steuern nach Anspruch 1,
    gekennzeichnet durch
    eine Steuereinheit (6), die den Vorgang zum Bestimmen der Beladungsmenge durchführt, nachdem eine bestimmte Menge an Wasser in den Laugenbehälter (3) gelangt ist.
  4. Verfahren zum Steuern nach einem der Ansprüche 1 bis 3,
    gekennzeichnet durch
    eine Steuereinheit (6), die bei jeder vollständigen Umdrehung (2p) die Differenzen (DWj=Wmaxj-Wminj) zwischen dem Minimalwert (Wminj) und dem Maximalwert (Wmaxj) der momentanen Winkelgeschwindigkeit (W) berechnet, während die Trommel (4) von Null auf eine bestimmte Geschwindigkeit beschleunigt wird, und
    die größte dieser Differenzen (Dwmax), die einer jeweiligen Drehung (j) entspricht, als den Wert der Winkelgeschwindigkeit (Wj) bestimmt, der der natürlichen Frequenz (Wn) für diese Beladung (L) entspricht.
  5. Verfahren zum Steuern nach einem der Ansprüche 1 bis 4,
    gekennzeichnet durch
    eine Steuereinheit (6), wobei der Maximalwert (Wm), auf den die Trommel (4) beschleunigt wird, vom Hersteller im Voraus festgelegt und aufgezeichnet wird.
  6. Verfahren zum Steuern nach Anspruch 5,
    wobei der Maximalwert (Wm), auf den die Trommel (4) beschleunigt wird, wird vom Hersteller festgelegt, indem ein bestimmter Sicherheitstoleranzwert zu der natürlichen Frequenz, die ermittelt wird, während die Trommel (4) leer ist, hinzuaddiert wird.
  7. Verfahren zum Steuern nach einem der Ansprüche 1 bis 6,
    gekennzeichnet durch
    eine Steuereinheit (6), die den Maximalwert (Wm), auf den die Trommel (4) beschleunigt wird, dynamisch bestimmt, indem sie die bei verschiedenen Vorgängen erzeugten natürlichen Frequenzwerte überwacht.
  8. Verfahren zum Steuern nach einem der Ansprüche 1 bis 3,
    gekennzeichnet durch
    eine Steuereinheit (6), wobei für alle diejenigen, die einer bestimmten Modellreihe angehören, dieselben Werte aufgezeichnet werden.
  9. Verfahren zum Steuern nach Anspruch 8,
    gekennzeichnet durch
    eine Steuereinheit (6), wobei die Ladungsdifferenzwerte (DLi) der Winkelgeschwindigkeit (Wn_e), die der erkannten natürlichen Frequenz entsprechen, und entsprechende Winkelgeschwindigkeitswerte (DWi), bei denen die natürliche Frequenz beobachtet wird, aufgezeichnet werden, während die Maschine leer ist;
    und die den Winkelgeschwindigkeitswert (Wn_f) bestimmt, der der natürlichen Frequenz entspricht, indem sie die Trommel (4) beschleunigt, nachdem Benutzer die Wäsche geladen hat, und
    die die Beladung (L) bestimmt, indem sie die Differenz (DW=Wn_e-Wn_f) zwischen zwei Winkelgeschwindigkeitswerten, die den natürlichen Frequenzen entsprechen, die erkannt werden, während die Trommel (4) leer und geladen ist, mit den aufgezeichneten Werten (DLi-DWi) vergleicht.
EP07822068A 2006-10-31 2007-10-31 Verfahren zur bestimmung des gewichts der last in einer waschmaschine mit trockner anhand der eigenfrequenzreaktion der beladenen trommel Not-in-force EP2094893B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200606046 2006-10-31
PCT/EP2007/061717 WO2008053002A2 (en) 2006-10-31 2007-10-31 Method for determining weight of the load in a washer dryer using the natural frequency response of the loaded drum

Publications (2)

Publication Number Publication Date
EP2094893A2 EP2094893A2 (de) 2009-09-02
EP2094893B1 true EP2094893B1 (de) 2011-09-14

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EP07822068A Not-in-force EP2094893B1 (de) 2006-10-31 2007-10-31 Verfahren zur bestimmung des gewichts der last in einer waschmaschine mit trockner anhand der eigenfrequenzreaktion der beladenen trommel

Country Status (3)

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EP (1) EP2094893B1 (de)
AT (1) ATE524593T1 (de)
WO (1) WO2008053002A2 (de)

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US9551103B2 (en) 2013-08-13 2017-01-24 Whirlpool Corporation Method to detect the type of a load in a laundry treating appliance
US9624615B2 (en) 2013-03-15 2017-04-18 Whirlpool Corporation Methods and compositions for treating laundry items

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US8166590B2 (en) 2009-04-16 2012-05-01 Whirlpool Corporation Method and apparatus for determining laundry load size
US8631527B2 (en) 2009-08-10 2014-01-21 Whirlpool Corporation Laundry treating appliance with tumble pattern control
US8381569B2 (en) * 2009-11-17 2013-02-26 Whirlpool Corporation Method and apparatus for determining load amount in a laundry treating appliance
US9428854B2 (en) * 2010-07-30 2016-08-30 Haier Us Appliance Solutions, Inc. Method and apparatus for balancing an unbalanced load in a washing machine
KR20130025265A (ko) * 2011-09-01 2013-03-11 삼성전자주식회사 세탁기 및 그 제어방법
US9702074B2 (en) 2013-03-15 2017-07-11 Whirlpool Corporation Methods and compositions for treating laundry items
KR20150054128A (ko) * 2013-11-11 2015-05-20 동부대우전자 주식회사 세탁기의 세탁제어 장치 및 방법
CN106592155A (zh) * 2016-10-31 2017-04-26 无锡小天鹅股份有限公司 洗衣机及其模糊称重的校正方法和校正装置

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DE4438760A1 (de) 1994-10-29 1996-05-02 Miele & Cie Verfahren zur Ermittlung einer von der Wäscheart und der Wäschemenge abhängigen Beladungsstufe
CA2242994C (en) * 1997-07-14 2008-09-16 Lg Electronics Inc. Method for detecting cloth amount in drum washing machine
EP1113102B1 (de) * 1999-12-28 2003-07-09 Whirlpool Corporation Verfahren zum Bestimmen der gesamten Trägheit und der Unwucht in der Trommel einer Wäschewaschmaschine
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US9644301B2 (en) 2013-03-15 2017-05-09 Whirlpool Corporation Methods and compositions for treating laundry items
US9689101B2 (en) 2013-03-15 2017-06-27 Whirlpool Corporation Methods and compositions for treating laundry items
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US10011935B2 (en) 2013-03-15 2018-07-03 Whirlpool Corporation Methods and compositions for treating laundry items
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US9551103B2 (en) 2013-08-13 2017-01-24 Whirlpool Corporation Method to detect the type of a load in a laundry treating appliance

Also Published As

Publication number Publication date
WO2008053002A2 (en) 2008-05-08
EP2094893A2 (de) 2009-09-02
ATE524593T1 (de) 2011-09-15
WO2008053002A3 (en) 2008-06-26

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