EP0219387B1 - Verfahren zum Erfassen des Wasserniveaus in einem Waschmaschinenbehälter und Waschmaschine zum Durchführen dieses Verfahrens - Google Patents

Verfahren zum Erfassen des Wasserniveaus in einem Waschmaschinenbehälter und Waschmaschine zum Durchführen dieses Verfahrens Download PDF

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Publication number
EP0219387B1
EP0219387B1 EP86402007A EP86402007A EP0219387B1 EP 0219387 B1 EP0219387 B1 EP 0219387B1 EP 86402007 A EP86402007 A EP 86402007A EP 86402007 A EP86402007 A EP 86402007A EP 0219387 B1 EP0219387 B1 EP 0219387B1
Authority
EP
European Patent Office
Prior art keywords
drum
water
washing machine
friction force
tub
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
EP86402007A
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English (en)
French (fr)
Other versions
EP0219387A1 (de
Inventor
Laurent Didier
Jean-Claude Geay
Jean-Marcel Duval
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
Original Assignee
Esswein SA
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 Esswein SA filed Critical Esswein SA
Priority to AT86402007T priority Critical patent/ATE47166T1/de
Publication of EP0219387A1 publication Critical patent/EP0219387A1/de
Application granted granted Critical
Publication of EP0219387B1 publication Critical patent/EP0219387B1/de
Expired 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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/087—Water level measuring or regulating devices
    • 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
    • D06F2103/18—Washing liquid level

Definitions

  • the invention relates to a method for detecting the level of water in a washing machine tank as well as to a washing machine implementing this method.
  • a washing machine usually has a tub intended to hold the washing or rinsing water, as well as a perforated drum containing the laundry and rotating in the tub.
  • the invention overcomes these drawbacks.
  • the height of water in the tank is determined by determining variations in the torque opposing the rotation of the drum when the latter rotates at constant speed.
  • the invention is based on the observation that, during the rotation of the drum, the friction of this drum and of the laundry against water causes a non-negligible resistant torque and that, in addition, this resistant couple varies with the depth of penetration of the drum. in water.
  • the inertia which is proportional to the acceleration, does not intervene in the measurement of the resisting torque.
  • the constant speed is such that the centrifugal acceleration around the periphery of the basket is greater than the acceleration gravity.
  • the variations in the resistive torque are determined by the variations in the motor torque.
  • the motor torque When the drum is rotated by a universal electric motor, the motor torque, and therefore the resistive torque, can be determined by measuring the intensity of the electric current passing through the motor, the motor torque depending, in this case, directly on this intensity.
  • the resistive torque is determined by this ignition phase angle of the switch.
  • the water introduction solenoid valve is closed, for example, when the increase in resistive torque, from its value before the increase, exceeds a predetermined limit; it is also possible to leave the solenoid valve open for a fixed time after the variation of the friction torque has exceeded this predetermined limit.
  • the latter can be used to determine the water level and control the solenoid valve d 'admission.
  • the program is such that periodically measure the phase angle e, store this angle in memory and compare it with the measurement that was taken at the very start of filling with water, i.e. before the water reaches the bottom of the drum. If the difference exceeds a predetermined value, the solenoid valve is closed or is kept open but only for a determined time.
  • the drum is first rotated, the diameter of which is 40 cm in one embodiment, at a first speed Vi, for example 80 revolutions per minute, and the resistive torque Cr 1 is determined which is stored in memory; then the drum is rotated at a higher speed V 2 , for example 120 revolutions per minute, and I am also on the resistive torque Cr 2 , the time interval separating the second from the first measurement being short enough so that the water height has practically not varied.
  • V 2 for example 120 revolutions per minute
  • I am also on the resistive torque Cr 2 the time interval separating the second from the first measurement being short enough so that the water height has practically not varied.
  • the difference Cr 2 - Cri is only a function of the speed-dependent friction couples, namely the resistance opposed by water and the resistance opposed by air.
  • the difference Cr 2 - Cn represents in practice only the friction of the linen in the water.
  • this difference Cr 2 - Cr 1 is also a function of the water height.
  • the washing machine has a microprocessor it is possible to incorporate in the memory of the latter a table of correspondence between the Cr 2 - Cn values and the water heights.
  • This table can also be incorporated into a memory specially provided for this purpose.
  • the washing machine is for domestic use with a tank 10 (FIG. 3) intended to contain the washing or rinsing water 11 and inside which rotates a perforated drum 12 containing the laundry 13 introduced. before starting the automatic operation of the machine.
  • the motor intended to rotate the drum 12, for example around a horizontal axis 14, is of the universal type with a rotor 15 (FIG. 1) in series with its stator 16 as well as with a triac 17.
  • This motor drives a tachometer generator 18 which delivers a signal representing the real speed of rotation of the motor on an input of a microprocessor 19 which compares this real speed with a reference speed in order to deliver an error signal ⁇ .
  • the latter is used to provide a duration ⁇ , or phase angle, of opening of the triac 17 at each period of the power signal, in general the 220 Volts, 50 Hz sector.
  • the comparison between the actual speed and the speed setpoint has been symbolized by a comparator 20 with an input receiving the signal from the tachometric generator and another input receiving the signal from a memory 21 of speed reference value .
  • the error signal e at the output of comparator 20 acts on the phase angle ⁇ supplied by a generator 22.
  • the output signal ⁇ from the generator 22 is applied to the trigger 23 of the triac 17 via an interface 24.
  • the motor torque Cm being equal to the resistive torque Cr, we can write:
  • the term is the resistant couple due to inertia, which, as we can see (by the term ), is proportional to the acceleration;
  • C f is the part of the resisting torque which is due to friction.
  • the values that periodically takes e, for example every second, and the value e is stored in the memory of the microprocessor 19, which is compared with the value ⁇ 0 previously measured at the start of filling with water, when the level is below the bottom of the drum.
  • the difference between these two measured values e and ⁇ 0 increases with the difference ⁇ C f between the corresponding values of the friction torque Cr.
  • the water supply solenoid valve can be closed as soon as this difference exceeds a predetermined limit; it is also possible to close this solenoid valve only after a time t following the time when the limit is exceeded.
  • This process is based on the observation that the friction torque opposing the rotation of the drum is higher when the drum and the laundry are bathed in water than in the opposite case. In addition, this friction torque increases with the height of water in which the drum plunges.
  • the value e which is taken into account for each measurement is preferably an average of these values for several periods.
  • each measurement corresponds to the average of four successive periods and the average value measurement is repeated every second.
  • the drum is rotated successively at two speeds. For example, the drum spins for five seconds at 80 revolutions per minute, then the next five seconds it spins at 120 revolutions per minute and then repeats the same cycle.
  • a preliminary calibration is carried out which is entered into the memory of the microprocessor in the form of a table of correspondence between the differences ⁇ 1 - 0 2 and the water levels.
  • This process allows, for example, to close the solenoid valve when a desired water height is reached, depending on the load of laundry previously measured by a process such as that described in French Patent 83 16997 in the name of the applicant.
  • Each measurement of the control angle 6 of the switch 17 is preferably equal to the average value over a number of periods T which corresponds to the duration of a complete revolution of the drum or of an entire number of revolutions of this drum.

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

Claims (12)

1. Verfahren, das ein Drehmomentsignal benutzt, um den Wasserstand in einem Behälter (10) einer Waschmaschine mit perforierter Trommel (12) zu bestimmen, die die Wäsche enthält und im Inneren dieses Behälters dreht, dadurch gekennzeichnet, daß man die Änderungen des Reibungsmomentes bestimmt, das der Drehung der Trommel (12) entgegenwirkt, wenn diese letztere mit konstanter Geschwindigkeit dreht.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die konstante Geschwindigkeit mindestens gleich der ist, für die die Zentrifugalbeschleunigung am Trommelumfang gleich der Erdbeschleunigung ist.
3. Verfahren nach Anspruch 1 oder 2 für die Bestimmung des Wasserstandes in einem Behälter einer Waschmaschine, deren Trommel durch einen Motor (15), gesteuert durch eine Regelung, an getrieben wird, dadurch gekennzeichnet, daß man das Reibungsmoment ausgehend von einem Regelungs-Fehlersignal (ε) bestimmt, das heißt die Differenz zwischen der wirklichen Rotationsgeschwindigkeit des Motors und der Einstellgeschwindigkeit.
4. Verfahren nach Anspruch 3 für die Steuerung einer Waschmaschine, deren Trommelantriebsmotor mit einem phasengesteuerten Unterbrecher (17) wie einem Triac in Serie liegt, dadurch gekennzeichnet, daß das Fehlersignal..(e) auf einen Phasenwinkel (9) wirkt und daß die Änderung des Reibungsmomentes, ausgehend von den Anderungen des Phasenwinkels (e) der Steuerung des Unterbrechers (17), bestimmt sind.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß man die Änderungen des Reibungsmomentes, ausgehend von den Änderungen der dem Antriebsmotors (15) der Trommel (12) zugeführten Leistung, bestimmt.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß man bei konstanter Spannung und einem Motor vorzugsweise vom Universaltyp die Änderungen der Stärke des Stromes, der diesen Motor durchfließt, mißt.
7. Verfahren nach einem der voranstehenden Ansprüche für die Bestimmung des Wasserstandes in einem Behälter einer Waschmaschine, deren Trommel durch einen Motor angetrieben wird, dessen Geschwindigkeit durch einen Regelkreis mit einem Mikroprozessor (19) bestimmt ist, dadurch gekennzeichnet, daß man periodisch eine Größe, - Funktion des Reibungsmomentes -, bestimmt, daß man sie abspeichert, und daß man sie mit dem am Anfang der Messung gespeicherten Wert vergleicht, wobei eine Änderung dieses Wertes eine Änderung des Wasserpegels anzeigt.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß die Wasserversorgung unterbrochen wird, wenn der Abstand zwischen den zwei Werten eine vorherbestimmte Grenze überschreitet oder nach einer bestimmten Zeit nach der Feststellung des Überschreitens der Grenze unterbrochen wird.
9. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß man periodisch über mehrere Perioden eines Unterbrechungssignales den Mittelwert der Größe, die das Widerstandsmoment darstellt, bestimmt.
10. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß man die Trommel der Waschmaschine mit einer ersten Geschwindigkeit (V1) während einer bestimmten Zeit drehen läßt, wobei man eine Größe bestimmt, die das Widerstandsmoment, das der Trommeldrehung während dieser Zeit entgegenwirkt, bestimmt, man darauf die Trommel mit einer höheren Geschwindigkeit (V2) drehen läßt, und man während dieser Zeit das Widerstandsmoment bestimmt, wobei die Differenz zwischen diesen Widerstandsmomenten der ersten und zweiten Geschwindigkeit den Wasserstand in dem Waschmaschinenbehälter darstellt.
11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß man eine vorhergehende Eichung auf die Weise ausführt, daß, man eine Zuordnungstabelle zwischen der Differenz zwischen zwei Widerstandsmomenten bei zwei verschiedenen Geschwindigkeiten einerseits und den Wasserständen andererseits abspeichert.
12. Waschmaschine mit perforierter Trommel (12), die im Innern eines Behälters (10) dreht und die Mittel enthält, um den Wasserstand in diesem Behälter zu bestimmen, wobei die Mittel, um den Wasserstand zu bestimmen, die Mittel enthalten, um die dem Trommelantriebsmotor (15) gelieferte Leistung zu bestimmen, wenn der Motor mit konstanter Geschwindigkeit dreht, wobei diese Anderungen die Anderungen des Widerstandsmomentes darstellen, das der Drehung der Trommel entgegenwirkt.
EP86402007A 1985-09-17 1986-09-12 Verfahren zum Erfassen des Wasserniveaus in einem Waschmaschinenbehälter und Waschmaschine zum Durchführen dieses Verfahrens Expired EP0219387B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86402007T ATE47166T1 (de) 1985-09-17 1986-09-12 Verfahren zum erfassen des wasserniveaus in einem waschmaschinenbehaelter und waschmaschine zum durchfuehren dieses verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8513756 1985-09-17
FR8513756A FR2587378B1 (fr) 1985-09-17 1985-09-17 Procede de detection du niveau d'eau dans une cuve de lave-linge et lave-linge mettant en oeuvre ce procede

Publications (2)

Publication Number Publication Date
EP0219387A1 EP0219387A1 (de) 1987-04-22
EP0219387B1 true EP0219387B1 (de) 1989-10-11

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EP86402007A Expired EP0219387B1 (de) 1985-09-17 1986-09-12 Verfahren zum Erfassen des Wasserniveaus in einem Waschmaschinenbehälter und Waschmaschine zum Durchführen dieses Verfahrens

Country Status (5)

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EP (1) EP0219387B1 (de)
AT (1) ATE47166T1 (de)
DE (1) DE3666237D1 (de)
ES (1) ES2000900A6 (de)
FR (1) FR2587378B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1246260B (it) * 1990-07-03 1994-11-17 Zanussi Elettrodomestici Dispositivo di misurazione del carico dell'acqua per macchine lavatrici.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678051A (en) * 1949-04-08 1954-05-11 Gen Electric Washing apparatus
US3065618A (en) * 1960-08-22 1962-11-27 Whirlpool Co Washing machine having liquid level control means
US3497884A (en) * 1968-02-06 1970-03-03 Whirlpool Co Automatic water level control
AU525345B2 (en) * 1978-04-04 1982-11-04 Tokyo Shibaura Denki Kabushiki Kaisha Automatic washer
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
FR2524020A1 (fr) * 1982-03-26 1983-09-30 Esswein Sa Machine a laver le linge a moyens de detection de balourds
AU567432B2 (en) * 1982-05-10 1987-11-19 Matsushita Electric Industrial Co., Ltd. Washing machine
FR2553881B1 (fr) * 1983-10-25 1987-11-20 Esswein Sa Procede de determination d'une charge de linge dans un tambour tournant, et machine a laver et/ou a secher mettant en oeuvre ce procede

Also Published As

Publication number Publication date
ATE47166T1 (de) 1989-10-15
EP0219387A1 (de) 1987-04-22
DE3666237D1 (en) 1989-11-16
FR2587378B1 (fr) 1987-11-20
FR2587378A1 (fr) 1987-03-20
ES2000900A6 (es) 1988-03-16

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