EP2604735B1 - Verfahren und Vorrichtung zum Steuern des Schleuderschrittes in einer Wasch- bzw. Wasch-/Trockenmaschine und Wasch- oder Wasch-/Trockenmaschine, die dieses Verfahren umsetzt - Google Patents

Verfahren und Vorrichtung zum Steuern des Schleuderschrittes in einer Wasch- bzw. Wasch-/Trockenmaschine und Wasch- oder Wasch-/Trockenmaschine, die dieses Verfahren umsetzt Download PDF

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Publication number
EP2604735B1
EP2604735B1 EP12196799.6A EP12196799A EP2604735B1 EP 2604735 B1 EP2604735 B1 EP 2604735B1 EP 12196799 A EP12196799 A EP 12196799A EP 2604735 B1 EP2604735 B1 EP 2604735B1
Authority
EP
European Patent Office
Prior art keywords
washing
value
speed
spin step
spin
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
EP12196799.6A
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English (en)
French (fr)
Other versions
EP2604735A1 (de
Inventor
Marco Saracini
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.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
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Filing date
Publication date
Application filed by Indesit Co SpA filed Critical Indesit Co SpA
Priority to PL12196799T priority Critical patent/PL2604735T3/pl
Publication of EP2604735A1 publication Critical patent/EP2604735A1/de
Application granted granted Critical
Publication of EP2604735B1 publication Critical patent/EP2604735B1/de
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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
    • 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
    • D06F33/76—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
    • 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 the field of household appliances, particularly to a method and a device for controlling the spin step of a washing or washing/drying appliance.
  • the present invention relates to a washing or washing/drying appliance implementing the method of the present invention.
  • Drum rotation is controlled by a motor, e.g. of the commutator type, the speed of which is determined by the quantity of alternating electric current supplied.
  • the latter is controlled by an electronic circuit which comprises devices such as TRIAC's, which vary the parameter known as "phase angle" of the alternating current supplied to the motor, i.e. they enable and interrupt the half-waves of the alternating current at different points, which depend on the instantaneous energy that must be supplied to the motor. The instantaneous energy depends on the speed at which the motor must run and on drum load.
  • the motor the revolution speed to be attained being equal, will require a quantity of energy depending on drum load, which means not only load weight, but also load type, i.e. the water retention property of the laundry and the distribution thereof inside the drum.
  • load means not only load weight, but also load type, i.e. the water retention property of the laundry and the distribution thereof inside the drum.
  • the latter characteristic is particularly important during the spin step, when the drum revolution speed is much faster than during the previous wash cycle steps.
  • any unbalance of the load i.e. an asymmetric positioning thereof in the drum, will generate noise, higher consumption and wear of components, which may even lead to failures of the latter.
  • washing appliances are available which can accept loads of more than 5 Kg, or which have a large-diameter drum, or which have a capacity up to 70 litres; in such appliances there is higher probability that the load will take a critical arrangement.
  • a method for controlling load unbalance comprises sub-steps of measuring load unbalance at a relatively slow "satellization" speed, e.g. 88 rpm (compared to spin speed), but nevertheless sufficient to keep the laundry items in a "satellization” condition, i.e. in adherence to the drum.
  • This unbalance measuring sub-step is typically carried out prior to starting the spin step; if any unbalance is detected, load redistribution procedures can be activated; the unbalance measuring step is also carried out during the spin step, between sub-steps at increasing speeds, in order to re-evaluate the unbalance during the spin step, since the unbalanced condition may arise dynamically, e.g. due to extraction of water from the items.
  • a spin step including at least two sub-steps at different drum revolution speeds, i.e. a first one (e.g. at 600 rpm) and at least another one at a faster speed (e.g. 800-1,000 rpm)
  • the drum will be slowed down to the above-mentioned satellization speed of 88 rpm, when a new unbalance check will be made; depending on the result of this check, if any unbalance is detected, the spin step will be resumed by limiting the speed at the previously reached value; otherwise, if no unbalance is detected, the speed will be increased to a value corresponding to that of the second sub-step.
  • US-2,917,175-A describes a method for controlling the spin step of a washing machine, which is based on measuring the phase difference between voltage and current at the electric motor that drives the drum: drum rotation will be reduced below the spin value, if said difference exceeds a given threshold value.
  • FIG. 1 shows the trends over time of characteristic quantities relating to the spin step, such as phase angle and rpm, in two typical situations.
  • phase angle refers to the OFF time of the alternating power current flowing in the TRIAC, which, as known, is an electronic component used for interrupting or not the phases of the alternating current supplied to the electric motor that drives the drum of the washing or washing/drying machine.
  • the phase angle is thus representative of the interruption time of the half-waves of the current supplied to the electric motor.
  • Figure 1 shows some trends of the phase-angle and rpm of the drum in two typical known cases of spin step actuation as a function of the arrangement of the load inside the drum, the initial load balance being equal.
  • the spin step is activated at successive angular speeds of 600, 800, 1,000 and 1,200 rpm. In both cases, between the 800 and 1,000rpm steps a known process for load unbalance control is carried out as previously described.
  • a high phase angle value corresponds to a low energy request from the motor, and vice versa.
  • the phase angle datum corresponds to the OFF time of the TRIAC, expressed in ⁇ s, within the 10ms half-period corresponding to one half-wave of the alternating power current.
  • the method for controlling the spin step of a washing or washing/drying appliance according to the invention is based on measuring and controlling the phase angle during the entire spin step.
  • a balance check is carried out at low speed (e.g. 88 rpm) (which step therefore precedes in time what is shown in Fig. 1 ).
  • the curve indicating the phase angle and the corresponding electric power supplied shows large oscillations which tend to decrease and settle after the drum has been rotating at that given speed for a while.
  • the initial phase angle values are not taken into account, since they are subject to large oscillations.
  • a certain tolerated initial transient time has elapsed (e.g. 30 s)
  • when the phase angle value has become stable said value can be measured and compared with a threshold value.
  • Said threshold value is a function of the speed at which the check is carried out, of the machine structure (drum volume, diameter and depth), and of the type of motor in use.
  • the load will be considered to be balanced at that speed: for example, a first speed may be approx. 500-600 rpm. In such a case, the balance check step at satellization speed may be avoided.
  • the spin cycle can then go on by switching to the next higher-speed step (e.g. 800 rpm), if there are multiple speeds, or proceed until the end, if there is only one speed.
  • the value is below threshold, it will be considered that the load is in an unbalanced condition, and therefore rotation at that speed will be stopped and a redistribution operation will be carried out, e.g. a known one consisting of alternately rotating the drum forwards and backwards at low speed (e.g. 45 rpm) a few times, e.g. three times.
  • the spin step will then be repeated while checking the phase angle as described above. If the value is above threshold, it will be considered that the load is now balanced at that speed, and the spin cycle can go on by switching to the next higher-speed step (e.g. 1,000 rpm), if another higher speed was set, or proceed until the end, if the achieved speed was the maximum one.
  • This succession of check and redistribution operations may be repeated for a maximum number of times, e.g. three. If after such operations the load is still unbalanced, the spin cycle will be completed at the current speed without any further acceleration, in that this will be considered to be an irrecoverable unbalanced condition.
  • the checks described for the previous step may be repeated again. If the spin program only includes two speeds, the second speed may be selected and held until the end of the cycle without any additional stops.
  • the highest speed used in the last step is usually a high value (e.g. 1,600 rpm): in this case, if the check gave a positive result in the previous steps, in this last step it will be possible to avoid executing the unbalance check.
  • the phase angle check and the comparison thereof with a related threshold value will however still be kept active, so that the spin cycle can be stopped in the event that limit conditions which might be dangerous for the structure should be detected.
  • the procedure of the present invention ensures optimization of times and consumptions.
  • the load balance verifications give positive results
  • the entire spin cycle will be faster because the machine will not have to be slowed down to satellization speed; this will also ensure significant energy savings.
  • the load balance verification carried out at spin speed gives a persisting negative result
  • the spin cycle will be either stopped or limited to that speed for which the check gave a positive result, thus reducing noise and oscillations (which are proportional to angular speed), and also reducing the probability of failures of components due to wear.
  • Phase angle detectors and motor/drum speed detectors are of known types and are normally already included in the appliance.
  • the steps of the method may be carried out through a controller using known hardware.
  • the control method of the present invention can advantageously be carried out through a computer program, which comprises coding means for implementing one or more steps of the method when said program is executed by a computer. It is therefore understood that the protection scope extends to said computer program as well as to computer-readable means that comprise a recorded message, said computer-readable means comprising program coding means for implementing one or more steps of the method when said program is executed by a computer.
  • the TRIAC may be replaced by any other electronic component or system adapted to interrupt or not, in a controlled manner, the half-waves of the power current supplied to the electric motor, so as to determine the revolution speed of the drum.
  • the check of the phase angle meaning by that the OFF time of current flowing in the TRIAC, should be considered to be equivalent to a complementary check of the ON time, i.e. the time during which current is not interrupted.

Landscapes

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

Claims (7)

  1. Verfahren zum Steuern des Schleuderschritts eines Wasch- oder Wasch- /Trocknungsgeräts, wobei das Gerät einen Elektromotor umfasst, der eine Trommel dreht, die angepasst ist, eine Ladung zu enthalten, wobei der Schleuderschritt eine oder mehrere Trommeldrehgeschwindigkeiten umfasst, wobei das Verfahren dadurch gekennzeichnet ist, dass es eine Prüfung eines unausgeglichenen Zustands der Ladung, basierend auf einem Vergleich zwischen dem augenblicklichen Phasenwinkelwert und einem oder mehreren Schwellwerten, umfasst, wobei der unausgeglichene Zustand in Unter-Schwellwert-Zuständen verifiziert wird, wobei der Phasenwinkel repräsentativ ist für die Unterbrechungszeit der Halbwellen des an den Elektromotor gelieferten Stroms.
  2. Verfahren nach Anspruch 1, wobei der Schleuderschritt eine oder mehrere Trommeldrehgeschwindigkeiten umfasst, wobei das Verfahren, bei einer ersten der einen oder mehreren Drehgeschwindigkeiten, eine Folge von Schritten umfasst:
    - Auswerten des augenblicklichen Phasenwinkelwerts und Vergleichen desselben mit einem ersten der Schwellwerte;
    - falls der augenblickliche Wert oberhalb des Schwellwerts liegt, Fortfahren bis zum Ende des Schleuderschritts, falls es nur eine Geschwindigkeit gibt, oder Umschalten auf den nächsten Geschwindigkeitswert, falls es mehr als eine Geschwindigkeit gibt;
    - falls der augenblickliche Wert unterhalb des Schwellwerts liegt, Durchführen einer Ladungsumverteilungsoperation und dann zumindest einmaliges Wiederholen der Folge von Schritten.
  3. Verfahren nach Anspruch 2, wobei der Schleuderschritt beendet wird, falls die Wiederholung der Folge von Schritten für eine Anzahl von Malen gleich drei den augenblicklichen Wert unterhalb des ersten Schwellwerts ergibt.
  4. Verfahren nach Anspruch 2, wobei, wenn auf den nächsten Geschwindigkeitswert umgeschaltet wird, die Folge von Schritten bei dem nächsten Geschwindigkeitswert durch einen Vergleich mit einem zweiten Schwellwert wiederholt wird.
  5. Verfahren nach Anspruch 1 oder 2 oder 3, wobei die Auswertung des augenblicklichen Phasenwinkelwerts beginnt, nachdem eine bestimmte Übergangszeit von dem Beginn der Drehung der Trommel bei einer entsprechenden Geschwindigkeit vergangen ist, wenn die Oszillationen des augenblicklichen Werts abgenommen haben und stabil geworden sind.
  6. Gerät zum Steuern des Schleuderschritts eines Wasch- oder Wasch- /Trocknungsgeräts, dadurch gekennzeichnet, dass es eine Steuerung umfasst, die zum Implementieren von jedem der Schritte des Verfahrens nach einem der Ansprüche 1 bis 5 programmiert ist.
  7. Wasch- oder Wasch-/Trocknungsgerät, umfassend ein Gerät zum Steuern des Schleuderschritts wie in Anspruch 6 beansprucht.
EP12196799.6A 2011-12-12 2012-12-12 Verfahren und Vorrichtung zum Steuern des Schleuderschrittes in einer Wasch- bzw. Wasch-/Trockenmaschine und Wasch- oder Wasch-/Trockenmaschine, die dieses Verfahren umsetzt Not-in-force EP2604735B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12196799T PL2604735T3 (pl) 2011-12-12 2012-12-12 Sposób i urządzenie do kontroli etapu wirowania urządzenia piorącego lub piorąco-suszącego oraz urządzenie piorąco-suszące realizujące wspomniany sposób

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001137A ITTO20111137A1 (it) 2011-12-12 2011-12-12 Metodo e dispositivo di controllo della fase di centrifuga in un apparecchio lavabiancheria o lavasciuga, ed apparecchio lavabiancheria che implementa tale metodo.

Publications (2)

Publication Number Publication Date
EP2604735A1 EP2604735A1 (de) 2013-06-19
EP2604735B1 true EP2604735B1 (de) 2015-01-14

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EP12196799.6A Not-in-force EP2604735B1 (de) 2011-12-12 2012-12-12 Verfahren und Vorrichtung zum Steuern des Schleuderschrittes in einer Wasch- bzw. Wasch-/Trockenmaschine und Wasch- oder Wasch-/Trockenmaschine, die dieses Verfahren umsetzt

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EP (1) EP2604735B1 (de)
ES (1) ES2534538T3 (de)
IT (1) ITTO20111137A1 (de)
PL (1) PL2604735T3 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106637823B (zh) * 2016-12-13 2019-03-15 广东威灵电机制造有限公司 洗衣机及其的脱水控制方法和装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2917175A (en) * 1959-01-22 1959-12-15 Gen Electric Unbalance sensing arrangement for machines having a centrifugal liquid extraction step
FR2665271B1 (fr) * 1990-07-24 1992-11-13 Sextant Avionique Procede de commande de la vitesse de rotation du tambour d'une machine a essorage centrifuge en fonction du balourd et machine pour la mise en óoeuvre de ce procede.
US5543698A (en) * 1994-09-27 1996-08-06 Allen-Bradley Company, Inc. Method and apparatus used with AC motor for detecting unbalance
US6038724A (en) * 1998-11-27 2000-03-21 General Electric Company Clothes load estimation method and washing machine
EP1342826A1 (de) * 2002-03-04 2003-09-10 Primus N.V. System für die Unwuchtsteuerung in Wascheinrichtungen

Also Published As

Publication number Publication date
ITTO20111137A1 (it) 2013-06-13
ES2534538T3 (es) 2015-04-23
PL2604735T3 (pl) 2015-06-30
EP2604735A1 (de) 2013-06-19

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