EP2065508A1 - Verfahren zum Erfassen des Füllstands einer Waschflüssigkeit in einer Waschmaschine und entsprechende Waschmaschine - Google Patents

Verfahren zum Erfassen des Füllstands einer Waschflüssigkeit in einer Waschmaschine und entsprechende Waschmaschine Download PDF

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Publication number
EP2065508A1
EP2065508A1 EP08168352A EP08168352A EP2065508A1 EP 2065508 A1 EP2065508 A1 EP 2065508A1 EP 08168352 A EP08168352 A EP 08168352A EP 08168352 A EP08168352 A EP 08168352A EP 2065508 A1 EP2065508 A1 EP 2065508A1
Authority
EP
European Patent Office
Prior art keywords
washing machine
wash liquid
tub
level
pressure switch
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.)
Granted
Application number
EP08168352A
Other languages
English (en)
French (fr)
Other versions
EP2065508B1 (de
Inventor
Costantino Mariotti
Giovanni Bombardieri
Mariano Funari
Nicola Colucci
Savio La Bella
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
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 Indesit Co SpA filed Critical Indesit Co SpA
Priority to EP16151124.1A priority Critical patent/EP3031972A1/de
Priority to EP15151838.8A priority patent/EP2899309A1/de
Priority to PL08168352T priority patent/PL2065508T3/pl
Publication of EP2065508A1 publication Critical patent/EP2065508A1/de
Application granted granted Critical
Publication of EP2065508B1 publication Critical patent/EP2065508B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4244—Water-level measuring or regulating arrangements

Definitions

  • the present invention relates to a method for detecting the level of a wash liquid in a washing machine, in particular a household laundry washing machine or dishwasher, according to the preamble of claim 1.
  • the level of a wash liquid is usually detected by measuring the pressure of said washing liquid through a pressure switch.
  • a type of pressure switch known in the art is the so-called "state" pressure switch, which essentially operates like an on-off switch, since it allows the wash liquid to be supplied into the machine tub when the wash liquid pressure is lower than a limit value, and stops the wash liquid supply as soon as the wash liquid pressure reaches said limit value.
  • An analogue pressure switch essentially consists of a casing containing a coil within which a ferromagnetic core is moved by a rubber diaphragm that expands through the effect of the pressure exerted by the wash liquid.
  • the coil is a part of an oscillating electric circuit that outputs a signal having a frequency that varies as a function of the different positions taken by the core within the coil itself, i.e. according to the deformation of the diaphragm caused by the pressure of the wash liquid.
  • the resonance frequency of the oscillating electric circuit changes in a substantially linear manner as a function of the displacement of the ferromagnetic core relative to the coil.
  • a control circuit of the washing machine is calibrated during the washing machine production or testing stages and is programmed in a manner such that it associates a certain value of the frequency of the oscillating electric circuit with a certain value of the pressure of the wash liquid in the washing machine.
  • the washing machine control circuit can detect the corresponding level of the wash liquid. This allows the control circuit to send appropriate commands to the various components of the washing machine, in particular pertaining to the washing machine wash liquid supply, according to the wash liquid level detected in the washing machine.
  • analogue pressure switch allows for the detection of a plurality of different wash liquid levels in the tub of the washing machine, its use causes some problems which are related, in particular, to the fact that the analogue pressure switch is less accurate than the state pressure switch in detecting the wash liquid level.
  • a further drawback of the above-described analogue pressure switch is that the margin of error in measuring the fluid pressure increases over time and with the wear of the parts making up said analogue pressure switch.
  • Fig. 1 is a diagrammatic view of a washing machine according to the present invention, designated as a whole by reference numeral 10.
  • Said washing machine 10 comprises a tub 11 which houses a drum 12 adapted to contain a certain quantity of laundry (not shown in the drawing).
  • said drum 12 is rotatable about a substantially horizontal axis, being in particular driven by a motor 13 and transmission means 14.
  • drum 12 may also be produced in a way to alternatively rotate about a substantially vertical axis.
  • Said washing machine 10 also comprises an analogue pressure switch 15 associated with tub 11 in a manner such that it detects the pressure of the wash liquid in said tub 11 and, consequently, a level L of the wash liquid in said tub 11.
  • Said washing machine 10 further comprises:
  • said means for managing and controlling washing machine 10 comprise an electronic board 20 adapted to store and execute a plurality of wash programs, which typically comprise wash cycles that may vary depending on load, cloth type, dirtiness degree or required rinsing performance for the laundry to be washed.
  • the method for detecting a level L of a wash liquid in washing machine 10 is characterized in that said analogue pressure switch 15 is subjected to a calibration process, said calibration process being implemented during an operational step of washing machine 10.
  • an operational step is essentially a step of use of the washing machine by a user.
  • said calibration process comprises the following self-calibration steps:
  • said initial frequency F 0 of the analogue pressure switch 15 is detected when tub 11 of washing machine 10 contains substantially no wash liquid.
  • the frequency difference ⁇ F with respect to the initial frequency F 0 is a function of level L of the wash liquid in tub 11 of the washing machine
  • said level L can be calculated by detecting the variation of frequency ⁇ F with respect to an initial frequency F 0 of analogue pressure switch 15, said initial frequency F 0 being detected when tub 11 of washing machine 10 contains substantially no wash liquid.
  • the level L is calculated as a ratio between the variation of frequency ⁇ F and angular coefficient ⁇ .
  • Said self-calibration steps are preferably repeated on a periodical basis during the operational step of washing machine 10 according to the present invention.
  • said self-calibration steps may be repeated at every beginning and/or end of the wash cycles of each wash program.
  • at the beginning and at the end of a wash cycle tub 11 contains substantially no wash liquid, since any wash liquid residue remaining in the laundry is substantially insignificant for determining level L of a wash liquid according to the present invention, and anyway it cannot affect the application of the method according to the present invention.
  • Said self-calibration steps may also be repeated every time a wash program of washing machine 10 according to the present invention is started; alternatively, said self-calibration steps may be carried out after a predefined number of wash programs.
  • such advantages consist in the fact that the method according to the present invention allows to detect a plurality of different levels of the wash liquid in the washing machine while at the same time providing precise and accurate measurements of the different levels of the wash liquid in the washing machine.
  • Another advantage of the present invention is that the method for detecting the level of a wash liquid in a washing machine, in particular a household laundry washing machine or dishwasher, is not affected by the passing of time or by the wear of the parts that make up the pressure switch used for the measurement.
  • the method may comprise a steam treatment for the laundry contained in drum 12, said steam treatment being in particular carried out in a manner such that a first wash liquid level L1 is kept below drum 12, so that the laundry will not absorb the wash liquid but will only be moistened by steam.
  • a further variant provides for activating a recirculation circuit (not shown in the drawing) for recirculating the wash liquid in washing machine 10, said activation taking place, in particular, when analogue pressure switch 15 detects a predetermined level L of the wash liquid in said tub 11.
  • the recirculation circuit which in a laundry washing machine terminates at an aperture obtained in the upper portion of tub 11 and serves to improve the soaking of the textile items during the wash treatment, may operate intermittently: in such a case, the recirculation circuit may also be deactivated when analogue pressure switch 15 detects a predetermined lower level L2 of the wash liquid in said tub 11 (wherein L2 ⁇ L, L2 being preferably a level at which wash liquid heating means are completely immersed in the wash liquid).
  • L2 ⁇ L, L2 being preferably a level at which wash liquid heating means are completely immersed in the wash liquid.
  • washing machine 10 may be a dishwasher and that the present invention is also applicable to said dishwasher.
  • the recirculation circuit will be the hydraulic circuit adapted to supply wash liquid to an upper sprayer and/or a lower sprayer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Washing And Drying Of Tableware (AREA)
EP08168352.6A 2007-11-23 2008-11-05 Verfahren zum Erfassen des Füllstands einer Waschflüssigkeit in einer Waschmaschine und entsprechende Waschmaschine Not-in-force EP2065508B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP16151124.1A EP3031972A1 (de) 2007-11-23 2008-11-05 Verfahren zur erfassung des füllstands einer waschflüssigkeit in einer waschmaschine und zugehörige waschmaschine
EP15151838.8A EP2899309A1 (de) 2007-11-23 2008-11-05 Verfahren zur Erfassung des Füllstands einer Waschflüssigkeit in einer Waschmaschine und zugehörige Waschmaschine
PL08168352T PL2065508T3 (pl) 2007-11-23 2008-11-05 Sposób wykrywania poziomu cieczy czyszczącej w urządzeniu czyszczącym oraz powiązane urządzenie czyszczące

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000843A ITTO20070843A1 (it) 2007-11-23 2007-11-23 Metodo per rilevare il livello di un liquido di lavaggio all'interno di una macchina di lavaggio, e relativa macchina di lavaggio.

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP15151838.8A Division EP2899309A1 (de) 2007-11-23 2008-11-05 Verfahren zur Erfassung des Füllstands einer Waschflüssigkeit in einer Waschmaschine und zugehörige Waschmaschine
EP16151124.1A Division EP3031972A1 (de) 2007-11-23 2008-11-05 Verfahren zur erfassung des füllstands einer waschflüssigkeit in einer waschmaschine und zugehörige waschmaschine

Publications (2)

Publication Number Publication Date
EP2065508A1 true EP2065508A1 (de) 2009-06-03
EP2065508B1 EP2065508B1 (de) 2015-01-21

Family

ID=40315030

Family Applications (3)

Application Number Title Priority Date Filing Date
EP08168352.6A Not-in-force EP2065508B1 (de) 2007-11-23 2008-11-05 Verfahren zum Erfassen des Füllstands einer Waschflüssigkeit in einer Waschmaschine und entsprechende Waschmaschine
EP15151838.8A Withdrawn EP2899309A1 (de) 2007-11-23 2008-11-05 Verfahren zur Erfassung des Füllstands einer Waschflüssigkeit in einer Waschmaschine und zugehörige Waschmaschine
EP16151124.1A Withdrawn EP3031972A1 (de) 2007-11-23 2008-11-05 Verfahren zur erfassung des füllstands einer waschflüssigkeit in einer waschmaschine und zugehörige waschmaschine

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP15151838.8A Withdrawn EP2899309A1 (de) 2007-11-23 2008-11-05 Verfahren zur Erfassung des Füllstands einer Waschflüssigkeit in einer Waschmaschine und zugehörige Waschmaschine
EP16151124.1A Withdrawn EP3031972A1 (de) 2007-11-23 2008-11-05 Verfahren zur erfassung des füllstands einer waschflüssigkeit in einer waschmaschine und zugehörige waschmaschine

Country Status (5)

Country Link
EP (3) EP2065508B1 (de)
ES (1) ES2535036T3 (de)
IT (1) ITTO20070843A1 (de)
PL (1) PL2065508T3 (de)
RU (1) RU2470101C2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11234577B2 (en) * 2020-01-22 2022-02-01 Haier Us Appliance Solutions, Inc. System and method for calibrating a wash fluid level detection system in a dishwasher appliance
EP4253633A4 (de) * 2021-04-28 2024-06-19 Samsung Electronics Co., Ltd. Waschmaschine und steuerungsverfahren dafür

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2377614A1 (fr) 1977-01-14 1978-08-11 Crouzet Sa Detecteurs de niveaux d'eau pour machines a laver
FR2641609A1 (fr) 1989-01-12 1990-07-13 Licentia Gmbh Procede pour determiner la quantite d'eau dans la cuve de lessive d'une machine a laver
EP1245714A2 (de) * 2001-03-27 2002-10-02 Diehl AKO Stiftung & Co. KG Verfahren zum Ausgleichen des Ansprechfehlers einer Füllstands-Druckdose in einer Waschmaschine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1541322A1 (ru) * 1988-01-18 1990-02-07 Украинский Научно-Исследовательский И Конструкторско-Технологический Институт Бытового Обслуживания Населения Способ управлени стиральными машинами
WO1998036123A2 (de) * 1997-02-17 1998-08-20 Miele & Cie. Gmbh & Co. Wäschebehandlungsgerät mit einem auf der trommelwelle angeordneten antriebsmotor
ES2226663T5 (es) * 2000-06-30 2008-02-16 Whirlpool Corporation Metodo para detectar y controlar el desequilibrio dinamico en un tambor de una maquina lavadora y maquina lavadora que utiliza dicho metodo.
EP1988209B1 (de) * 2007-04-30 2011-01-05 Electrolux Home Products Corporation N.V. Verfahren zum Steuern eines Trommelwäschetrockners

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2377614A1 (fr) 1977-01-14 1978-08-11 Crouzet Sa Detecteurs de niveaux d'eau pour machines a laver
FR2641609A1 (fr) 1989-01-12 1990-07-13 Licentia Gmbh Procede pour determiner la quantite d'eau dans la cuve de lessive d'une machine a laver
EP1245714A2 (de) * 2001-03-27 2002-10-02 Diehl AKO Stiftung & Co. KG Verfahren zum Ausgleichen des Ansprechfehlers einer Füllstands-Druckdose in einer Waschmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11234577B2 (en) * 2020-01-22 2022-02-01 Haier Us Appliance Solutions, Inc. System and method for calibrating a wash fluid level detection system in a dishwasher appliance
EP4253633A4 (de) * 2021-04-28 2024-06-19 Samsung Electronics Co., Ltd. Waschmaschine und steuerungsverfahren dafür

Also Published As

Publication number Publication date
ES2535036T3 (es) 2015-05-04
EP2065508B1 (de) 2015-01-21
RU2008146189A (ru) 2010-05-27
PL2065508T3 (pl) 2015-08-31
EP2899309A1 (de) 2015-07-29
EP3031972A1 (de) 2016-06-15
ITTO20070843A1 (it) 2009-05-24
RU2470101C2 (ru) 2012-12-20

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