EP1900867A1 - Procédé de détection des défaillances de la pompe dans une lave-linge - Google Patents

Procédé de détection des défaillances de la pompe dans une lave-linge Download PDF

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Publication number
EP1900867A1
EP1900867A1 EP06120591A EP06120591A EP1900867A1 EP 1900867 A1 EP1900867 A1 EP 1900867A1 EP 06120591 A EP06120591 A EP 06120591A EP 06120591 A EP06120591 A EP 06120591A EP 1900867 A1 EP1900867 A1 EP 1900867A1
Authority
EP
European Patent Office
Prior art keywords
pump
conduit
signal
difference
sensor
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.)
Withdrawn
Application number
EP06120591A
Other languages
German (de)
English (en)
Inventor
Stefano Casagrande
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP06120591A priority Critical patent/EP1900867A1/fr
Publication of EP1900867A1 publication Critical patent/EP1900867A1/fr
Withdrawn legal-status Critical Current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
    • D06F34/22—Condition of the washing liquid, e.g. turbidity
    • 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 
    • D06F33/47—Responding to irregular working conditions, e.g. malfunctioning of pumps 
    • 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
    • D06F2103/20—Washing liquid condition, e.g. turbidity
    • 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
    • D06F2105/06—Recirculation of washing liquids, e.g. by pumps or diverting valves
    • 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
    • D06F2105/58—Indications or alarms to the control system or to the user

Definitions

  • the present invention refers to a method for detecting pump faults in a washing machine.
  • Modern washing machines are provided with a washing liquor circulating system in which washing liquor discharged from the rotating drum at the bottom of the tub is fed back to the drum inner region by means of a pipeline having an outlet placed at an upper portion of the drum so as to drop the washing liquor on the laundry to be washed.
  • the circulating system comprises a pump and a sensor device arranged on the pipeline respectively for moving the liquor and for detecting if liquor is actually circulating in the pipeline.
  • Such a washing machine is known from US 6,378,341 .
  • the sensor device comprises a turbidity sensor, placed in a measuring section of the laundering water recirculation conduit, and a float designed as a valve disk provided with a stem protruding into the measuring section of the turbidity sensor when the volumetric flow in the conduit is absent or unable to lift the float.
  • the sensing function detecting whether a fluid is circulating in the recirculation conduit results from the cooperation of the floating body movement within the conduit and the signal provided by the turbidity sensor.
  • the float since the float is placed inside a conduit where detergent scale and lint can accumulate, it is possible that such float blocks after a number of washing cycles causing sensing errors or a complete absence of the sensing function. A fault of the sensing function compromises laundry washing results.
  • the aim of the present invention is therefore to solve the noted problems and thus providing a method for detecting pump faults having an improved reliability.
  • Another object of the present invention is to provide a method for detecting pump faults that does not require mechanical modifications of existing washing machines.
  • a further object of this invention is to provide a method for detecting pump faults which is suitable to sense whether a fluid circulation is in progress in a conduit without the need of any movable body.
  • Figure 1 shows schematically a washing machine provided with a turbidity sensor
  • Figure 2 shows a graph representing turbidity sensor outputs for experimental measurements in an empty conduit and in a conduit in which a volumetric flow is in progress.
  • conduit 3 in fluid communication with a pump 4.
  • Said conduit 3 conveys washing liquor to a drum inner region 7 suitable for receiving laundry to be washed.
  • conduit 3 is in the form of a recirculating pipeline draining washing liquor from the bottom portion of the tub 2 and spraying the liquor on the laundry from a top portion of the tub 2.
  • a turbidity sensor 5 of known type is arranged in a region of the conduit 3 representing the measuring section of the turbidity sensor 5 and consisting of translucent material, so as a light beam transmitted by a transmitting part of the sensor 5 can pass through the conduit 3 to a receiving part of the sensor 5.
  • the method for detecting pump 4 faults is based on checking whether a flow is effectively occurring in conduit 3 when the pump 4 is energized. Such check is performed using signals provided by turbidity sensor 5 when pump 4 is in a first condition of rest, i.e. when it is switched off or not energized and when the pump 4 is in a second working condition, i.e. when it is energized.
  • the turbidity sensor 5 is preferably placed above the maximum level of washing liquor in the tub 2.
  • it is sufficient ensuring that the sensor measurement, performed when the pump 4 is switched off, is done before draining water from the main water supply.
  • a first turbidity measurement is carried out by the sensor 5 when pump 4 is switched off and the conduit 3 is empty.
  • Signal given by the sensor 5 is clearly not indicative of a fluid turbidity, but it corresponds to the condition in which there is no fluid circulation in progress within the conduit 3.
  • a second signal is provided by turbidity sensor 5 after the pump 4 has been energized. If the pump 4 works correctly, a flow will occur in conduit 3 and the sensor 5 will give an indication of turbidity of the liquor circulating in the conduit 3. If the energized pump 4 does not effectively generate a flow in the conduit 3, the sensor 5 will provide a signal that can be considered equal to that provided in the first measurement taking into account also the sensor 5 measurement error.
  • Signal taken after the pump 4 has been energized is compared with the signal indicative of condition in which there is no fluid circulation in conduit 3 and the difference between such signals is calculated. Such difference is further compared with a preset threshold value indicative of the "not working state" of the pump 4. If the calculated difference is lower than the preset threshold value, a pump fault signal is supplied.
  • a preferred threshold value is 0.01.
  • Figure 2 shows signals provided by a turbidity sensor 5 by varying the percentage of light beam emitted when the conduit 3 is empty and the pump 4 is switched off (Line A), and when a cleaned fluid flows within conduit 3 (Line B).
  • the field between lines A and B defines the space in which a turbidity sensor measurement falls when a turbid fluid flows within conduit 3.
  • the turbidity sensor 5 preferably provides a voltage signal as output, other forms of outputs are equivalently possible.
  • the present method for detecting pump faults has an improved reliability and it does not require any modification in already existing washing machines to be applied.
  • the turbidity sensor 5 present in any case in modern washing machines is thus used not only for measuring turbidity during washing and rinsing cycles of the washing machine but also for controlling the operative state of a recirculation pump. It is consequently possible to avoid the use of a separate sensor element for controlling such pump.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP06120591A 2006-09-13 2006-09-13 Procédé de détection des défaillances de la pompe dans une lave-linge Withdrawn EP1900867A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06120591A EP1900867A1 (fr) 2006-09-13 2006-09-13 Procédé de détection des défaillances de la pompe dans une lave-linge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06120591A EP1900867A1 (fr) 2006-09-13 2006-09-13 Procédé de détection des défaillances de la pompe dans une lave-linge

Publications (1)

Publication Number Publication Date
EP1900867A1 true EP1900867A1 (fr) 2008-03-19

Family

ID=37685968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06120591A Withdrawn EP1900867A1 (fr) 2006-09-13 2006-09-13 Procédé de détection des défaillances de la pompe dans une lave-linge

Country Status (1)

Country Link
EP (1) EP1900867A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2455529A1 (fr) * 2009-07-14 2012-05-23 Panasonic Corporation Machine à laver

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3603323A1 (de) * 1986-02-04 1987-08-06 Bosch Siemens Hausgeraete Trommelwaschmaschine mit einer mehrteiligen fluessigkeits-leitung
EP0992621A2 (fr) * 1998-10-07 2000-04-12 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour commander un appareil ménager de conduisant du liquide et un appareil ménager fonctionnant selon ce procédé
US6378341B1 (en) * 1997-11-04 2002-04-30 Bsh Bosch Und Siemens Hausgeraete Gmbh Automatically controlled washing machine with a lye rolling system
DE20023575U1 (de) * 2000-12-08 2004-11-25 BSH Bosch und Siemens Hausgeräte GmbH Waschmaschine
EP1688529A1 (fr) * 2005-01-28 2006-08-09 Electrolux Home Products Corporation N.V. Machine à laver avec distributeur de détergent

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3603323A1 (de) * 1986-02-04 1987-08-06 Bosch Siemens Hausgeraete Trommelwaschmaschine mit einer mehrteiligen fluessigkeits-leitung
US6378341B1 (en) * 1997-11-04 2002-04-30 Bsh Bosch Und Siemens Hausgeraete Gmbh Automatically controlled washing machine with a lye rolling system
EP0992621A2 (fr) * 1998-10-07 2000-04-12 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour commander un appareil ménager de conduisant du liquide et un appareil ménager fonctionnant selon ce procédé
DE20023575U1 (de) * 2000-12-08 2004-11-25 BSH Bosch und Siemens Hausgeräte GmbH Waschmaschine
EP1688529A1 (fr) * 2005-01-28 2006-08-09 Electrolux Home Products Corporation N.V. Machine à laver avec distributeur de détergent

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2455529A1 (fr) * 2009-07-14 2012-05-23 Panasonic Corporation Machine à laver
EP2455529A4 (fr) * 2009-07-14 2013-11-20 Panasonic Corp Machine à laver

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