EP0091336B1 - Waschmaschine mit Vorrichtung zum Erfassen der Unwuchtschwingungen - Google Patents

Waschmaschine mit Vorrichtung zum Erfassen der Unwuchtschwingungen Download PDF

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Publication number
EP0091336B1
EP0091336B1 EP83400575A EP83400575A EP0091336B1 EP 0091336 B1 EP0091336 B1 EP 0091336B1 EP 83400575 A EP83400575 A EP 83400575A EP 83400575 A EP83400575 A EP 83400575A EP 0091336 B1 EP0091336 B1 EP 0091336B1
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EP
European Patent Office
Prior art keywords
machine
speed
drum
error signal
control system
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.)
Expired
Application number
EP83400575A
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English (en)
French (fr)
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EP0091336B2 (de
EP0091336A1 (de
Inventor
Laurent Didier
Jean-Claude Geay
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.)
Esswein SA
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Esswein SA
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Application filed by Esswein SA filed Critical Esswein SA
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Publication of EP0091336B1 publication Critical patent/EP0091336B1/de
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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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • 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 invention relates to a washing machine and a device for controlling the drum drive motor of such a machine.
  • the invention overcomes this drawback.
  • the machine comprising means for controlling the speed of rotation of the drum to a setpoint provided by a programmer, use is made of the difference between the actual speed of the drum and the setpoint speed to detect the imbalance. No particular detection means are therefore provided for unbalances because it is the same means and the same signal which ensures the unbalance detection and the speed regulation.
  • the assembly is such that the control is of average precision so that said deviation, or error signal, has a non-negligible value.
  • the precision of the regulation is 3 rpm, that is to say that a difference between the actual rotation speed and the set speed is only detected if it exceeds 3 rpm .
  • the error signal it is also possible to choose an engine power which is not excessively excessive.
  • the speed is measured using a tachometric generator driven by the motor and the analog signal supplied by this generator is applied to the input of a microprocessor in which, after conversion into digital form, it is compared to digital speed setpoint signals to regulate.
  • the microprocessor is also such that if the difference exceeds a determined value at the start of a spin phase, a speed decrease command is produced to stop the rotation or decrease the speed so as to remove the unbalance.
  • the washing machine comprises an electric motor 10 supplied with alternating current by means of a switching power supply comprising, in a manner known per se, a controlled switch 11 such as a triac and a circuit for control of this switch.
  • a controlled switch 11 such as a triac
  • the motor is supplied with direct current.
  • the speed of rotation of the motor 10 for driving the drum of the machine is a function of the power received by this motor, that is to say of the duration of closure of the switch 11 during a given period. .
  • This given period is for example an alternation or a half-alternation of the alternating current.
  • the switch 11 being a triac, it is such that as soon as it has received a conduction command pulse on its trigger 13, it remains conductive until the current passing through it passes through the value zero .
  • the duration of closure of the switch 11 then depends only on the instant of its closure during a half-period of the alternating current. This instant is commonly expressed as a phase shift angle 0 relative to the start of the alternation, the end of half-cycle corresponding to 180 ° ( Figure 2).
  • control pulses of the triac 11 are delivered by an interface circuit 12 receiving its input signals from the output 14 of a micro-processor 15 into which all the programming instructions of the machine have been introduced.
  • This microprocessor 15 has an input 16 receiving the analog signal supplied by a tachometer generator 17 driven by the motor shaft 10.
  • the speed setpoint instructions for the motor 10 are stored in digital form and are compared with the digital signals of real speed, obtained after an analog-digital conversion (carried out inside the microprocessor 15) of the signals supplied by the generator 17, in order to control the speed of the motor 10 to the programmed reference speed.
  • the microprocessor is thus programmed to calculate the difference ⁇ , or error signal, between the set speed V c and the actual speed V r : and this difference is converted, thanks to a table introduced into the memory of the microprocessor 15, into an angle ⁇ making it possible to close the switch 11 at each half-wave at an instant such that the error signal is minimized, the real speed being thus brought as close as possible to the set speed.
  • each speed signal is expressed by a binary number, or word, of 8 bits.
  • the speed is thus measured using 256 elements. Since the drum can rotate at 750 rpm, a speed increment corresponds to 3 rpm. In other words, the precision of the regulation is 3 revolutions / min.
  • the error signal e calculated in the microprocessor 15 is also used to detect unbalances during the acceleration of the rotation of the motor. If, during this acceleration, the error signal ⁇ exceeds a limit value ⁇ M the engine is slowed down and it is commanded to carry out a release operation and then resume its acceleration. If an unbalance is again detected, a release operation is again ordered. However, the engine is completely stopped by three unsuccessful attempts, that is to say after three tests having shown that the error signal exceeds the limit value s M. In fact, experience has shown that after three stripping operations, the probability that the laundry is distributed irregularly, and thus causes unbalances, is practically negligible.
  • the various elements of the servo being such that the error signal is not too weak, the unbalance is always detectable under good conditions. In fact, if the quality of the regulation is too high, even in the event of an imbalance, the error signal can be very weak. On the contrary by choosing a regulation quality which is not too important, the error signal ⁇ will keep a measurable value, easily exploitable for the detection of unbalances.
  • FIG. 3 is a simplified flowchart showing part of the programming of the microprocessor 15.
  • the diamonds correspond to comparisons and the rectangles to operations carried out.
  • This flowchart being an integral part of the present description, it is not necessary to describe it in detail.
  • the operation corresponding to the diamond 20 "speed increase" consists in determining if, on the one hand, the speed of the motor increases and, on the other hand, if this speed is between 50 revolutions / min (speed which corresponds to washing) and 150 rpm. It is only in the event of a positive answer to this question that the comparison is made between the error signal ⁇ and the limit value ⁇ M (diamond 21). In the example ⁇ M is of the order of 30 revolutions / min.

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

Claims (11)

1. Waschmaschine mit einer Regelung der Geschwindigkeit des Antriebsmotors (10) der Trommel auf einen von einem Programmschaltwerk gelieferten Einstellwert, sowie mit einer Vorrichtung zur Erfassung von Unwuchten in der Trommel, dadurch gekennzeichnet, daß die Unwuchten durch das Fehlersignal der Regelung, d. h. die Differenz (s) zwischen der wirklichen Umdrehungsgeschwindigkeit der Trommel (Vr) und ihrer Einstellgeschwindigkeit (Vc), erfaßt werden.
2. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß die Genauigkeit der Regelung begrenzt ist, damit das Fehlersignal einen meßbaren Wert hat.
3. Maschine nach Anspruch 2, dadurch gekennzeichnet, daß die Genauigkeit der Messung der Umdrehungsgeschwindigkeit in der Größenordnung von 3 Umdrehungen pro Minute beträgt.
4. Maschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß sie eine Vorrichtung zum Bremsen der Trommel, wenn das Fehlersignal (s) einen Grenzwert (SM) übersteigt, aufweist.
5. Maschine nach Anspruch 4, dadurch gekennzeichnet, daß der Grenzwert (εM) in der Größenordnung von 30 Umdrehungen pro Minute liegt.
6. Maschine nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Trommel nur gebremst wird, wenn die Umdrehungsgeschwindigkeit höher als diejenige ist, die einer Waschphase entspricht.
7. Maschine nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß ein Arbeitsgang zum Auflockern betätigt wird, wenn das Fehlersignal (e) den Grenzwert (FM) überschreitet, und daß der Motor anschließend erneut beschleunigt wird.
8. Maschine nach Anspruch 7, dadurch gekennzeichnet, daß der Motor nach drei Arbeitsgängen der Lockerung, nach denen unzulässige Unwuchten erfaßt wurden, endgültig abgeschaltet wird.
9. Maschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß sie einen Mikroprozessor (15) für die Regelung und die Erfassung der Unwuchten aufweist.
10. Maschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß sie einen Tachogenerator (17) zum Messen der wirklichen Umdrehungsgeschwindigkeit der Trommel aufweist.
11. Maschine nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß der Antriebsmotor (10) der Trommel von einer durch die Regelung betätigten Phasenanschnittsversorgung (11) gespeist ist.
EP83400575A 1982-03-26 1983-03-18 Waschmaschine mit Vorrichtung zum Erfassen der Unwuchtschwingungen Expired - Lifetime EP0091336B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8205256A FR2524020A1 (fr) 1982-03-26 1982-03-26 Machine a laver le linge a moyens de detection de balourds
FR8205256 1982-03-26

Publications (3)

Publication Number Publication Date
EP0091336A1 EP0091336A1 (de) 1983-10-12
EP0091336B1 true EP0091336B1 (de) 1985-09-11
EP0091336B2 EP0091336B2 (de) 1992-11-19

Family

ID=9272464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400575A Expired - Lifetime EP0091336B2 (de) 1982-03-26 1983-03-18 Waschmaschine mit Vorrichtung zum Erfassen der Unwuchtschwingungen

Country Status (4)

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EP (1) EP0091336B2 (de)
DE (1) DE3360760D1 (de)
ES (1) ES8402039A1 (de)
FR (1) FR2524020A1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577949B1 (fr) * 1985-02-28 1988-02-12 Esswein Sa Machine a laver et a essorer a duree d'essorage variable
FR2587378B1 (fr) * 1985-09-17 1987-11-20 Esswein Sa Procede de detection du niveau d'eau dans une cuve de lave-linge et lave-linge mettant en oeuvre ce procede
FR2629484B1 (fr) * 1988-03-29 1990-11-16 Esswein Sa Perfectionnement aux moyens de detection de balourds dans les lave-linge
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.
DE19522393C2 (de) * 1995-06-23 1998-04-09 Miele & Cie Vorrichtung und Verfahren zur Bestimmung der Unwucht bei einer Trommelwaschmaschine
DE19842611C2 (de) * 1997-12-10 2000-11-16 Miele & Cie Waschmaschine oder Waschtrockner
GB0006502D0 (en) 2000-03-18 2000-05-10 Notetry Ltd Laundry appliance
DE10110854C5 (de) * 2000-04-07 2010-03-04 Miele & Cie. Kg Vorrichtung zur Bestimmung der Unwucht in einer Trommelwaschmaschine
DE102004021627B3 (de) * 2004-05-03 2005-08-18 Koenig & Bauer Ag Rollenträger zur Lagerung einer aufgeachsten Vorratsrolle
FR2898262B1 (fr) * 2006-03-13 2012-11-02 Seb Sa Appareil de preparation culinaire equipe de moyens de detection du balourd

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152462A (en) * 1961-12-13 1964-10-13 Gen Motors Corp Clothes washing machine and control means therefor
US3674419A (en) * 1970-11-25 1972-07-04 Whirlpool Co Spin control for a washer-dryer
IT1038355B (it) * 1975-05-22 1979-11-20 Ire Spa Procedimento e macchina automatica per lavare e centrifugare la biancheria
DE2915815A1 (de) * 1979-04-19 1980-11-06 Bauknecht Gmbh G Vorrichtung zum erfassen der drehzahl und der unwucht eines in einem gehaeuse schwingend gelagerten aggregates
FR2489384A1 (fr) * 1980-09-02 1982-03-05 Esswein Sa Dispositif de suppression de balourd dans une centrifugeuse et machine, lave-linge notamment, comportant un tel dispositif
DE3039315C2 (de) * 1980-10-17 1984-10-31 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Schaltungsanordnung zur Stromversorgung eines drehzahlregelbaren Elektromotors
FR2496136A1 (fr) * 1980-12-17 1982-06-18 Amiens Const Electromeca Machine a laver a tambour rotatif munie d'un dispositif detecteur de balourd
DE3101511A1 (de) * 1981-01-19 1982-08-26 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur belastungsermittlung von durch einen elektromotor angetriebenen geraeten

Also Published As

Publication number Publication date
DE3360760D1 (en) 1985-10-17
ES520989A0 (es) 1984-01-01
FR2524020B1 (de) 1985-01-04
ES8402039A1 (es) 1984-01-01
FR2524020A1 (fr) 1983-09-30
EP0091336B2 (de) 1992-11-19
EP0091336A1 (de) 1983-10-12

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