EP0967319A1 - Procédé et dispositif pour déterminer l'humidité résiduelle du linge dans un sèche-linge - Google Patents

Procédé et dispositif pour déterminer l'humidité résiduelle du linge dans un sèche-linge Download PDF

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Publication number
EP0967319A1
EP0967319A1 EP99112258A EP99112258A EP0967319A1 EP 0967319 A1 EP0967319 A1 EP 0967319A1 EP 99112258 A EP99112258 A EP 99112258A EP 99112258 A EP99112258 A EP 99112258A EP 0967319 A1 EP0967319 A1 EP 0967319A1
Authority
EP
European Patent Office
Prior art keywords
laundry
drum
residual moisture
moisture content
voltage
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
EP99112258A
Other languages
German (de)
English (en)
Other versions
EP0967319B1 (fr
Inventor
Wenzel Meierfrankenfeld
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.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
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 Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP0967319A1 publication Critical patent/EP0967319A1/fr
Application granted granted Critical
Publication of EP0967319B1 publication Critical patent/EP0967319B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • 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
    • D06F2103/44—Current or voltage
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity

Definitions

  • the invention relates to a method for determining the residual moisture content of the laundry in a tumble dryer with a rotatably mounted drum that receives the laundry, a heating device, a blower, a program control device and one Device for evaluating and recording the residual moisture content in the laundry by means of a capacitor, the components of which by components of the dryer such.
  • B. the Drum are formed and an apparatus for performing the method.
  • DE 196 51 883 C1 describes a method for detecting residual moisture and an arrangement known to carry out the method in which the rotatable drum and fixed door or the housing form the capacitor plates of a capacitor.
  • the Electrostatic charging is caused by the movement and mutual friction of the Laundry generated in the drum.
  • the discharge currents of this capacitor are via a connected to the fixed capacitor plate, formed by a door or housing as well as the resistance connected to the drum by sliding contact.
  • the Discharge currents are measured during specified time intervals. From the measured values of the Individual time intervals mean values are formed, the change in the mean value the Dryness of the laundry determined.
  • This embodiment has the same disadvantages as those previously known Conductivity measurement method in terms of noise generation and wear due to here Loop transformers are also used.
  • the evaluation of the intensity of the discharge current due to the electrostatic charge in the laundry at different Types of laundry such as synthetic or natural fibers are problematic.
  • Another disadvantage is that only residual moisture values below 2% can be measured with this method.
  • DE 43 21 322 A1 describes a method for the contactless determination of the Moisture content of a moving material web, in which an electric field is too high measuring path is generated. Using a high DC voltage A charge signal is influenced locally in the material web, its level and temporal behavior is recorded in charge measuring probes, which is seen in the direction of material travel downstream of the electrode and arranged in geometrically precisely defined positions are. Based on the charge build-up in the field and the subsequent unloading Residual moisture content of the material web recorded. This arrangement is suitable for the moisture content to determine a material web moving at a uniform known speed.
  • the invention thus presents the problem of a method for contactless detection of the Residual moisture content of a laundry item in a rotatably mounted laundry drum execute that the moisture values for different types of laundry and different Load quantities are recorded exactly and for the control of the drying process are to be evaluated.
  • a device for carrying out the method is said to Do not transfer the measured values by means of sliding contact in the previously usual design.
  • the device for carrying out the method is inexpensive to produce overall, because the high demands on the electrical insulation properties of contact tape pads and holder of the carbon loop transmitter are omitted.
  • the sensor electrode for Measured value acquisition is galvanically separated from the measuring arrangement and is also a pure one Alternating current is present as a measuring current, there are galvanic material migration in the Sensor electrode excluded.
  • a particular advantage of the method according to the invention is that the frequency at Input of the first capacitor can be adjusted so that over the entire Laundry resistance range a constant voltage drop across the laundry resistor can be measured is. Residual moisture values can be identified in minute increments via the frequency.
  • Drum ribs (7) are arranged in the laundry drum (1), at least one of which is formed with a measuring electrode (8) of the device for detecting the residual moisture content in the laundry.
  • This drum rib (7) is insulated from the drum jacket with the interposition of insulation (9).
  • the measuring arrangement for determining the voltage across the laundry resistance RW works contactlessly by means of a capacitor plate arrangement on the drum jacket.
  • the capacitor plates C1 and C2 of a first and second capacitor are arranged at a distance from the drum jacket.
  • the drum rib (7) which is insulated from the drum jacket, forms the second capacitor plate for both capacitors C1 and C2, which are connected to the voltage measuring device U via the washing resistor RW.
  • the ground potential M required on the drum jacket is transmitted, for example, by means of a contact spring arranged on the central bearing (10) of the drum (1). As can be seen from FIG.
  • the capacitor plates of the capacitors C1 and C2 only face each other at a certain angle of rotation of the drum (7), so that the residual moisture in the laundry can only be determined once in the course of a drum revolution.
  • the first capacitor plates of the capacitors C1 and C2, viewed in the preferred direction of rotation V of the drum (1), are arranged on a drum jacket line (11), which is measured in an angular range from 0 ° to 30 ° from the bottom dead center position of the drum rib (7).
  • the capacitor plate C1 is an AC voltage generator (12) and the capacitor plate C2 is assigned a voltage measuring device (13).
  • Figure 2 shows the circuit diagram for this arrangement.
  • the oscillator (12) generates, for example, an AC voltage of 30V with a frequency of approximately 50 Hz to 100 kHz at point a.
  • This signal is transmitted via capacitor C1 with a known capacitance to point b at the unknown laundry resistor RW.
  • the voltage that arises at point b can be calculated.
  • Ub Among other things ⁇ RW RW 2nd + XC 1 2nd
  • the voltage at point b is transmitted to the voltage measuring unit U via the capacitor C2 and measured there.
  • the laundry resistance RW can be calculated.
  • RW XC 1 2nd Among other things Ub 2nd - 1
  • the value of the residual moisture in the laundry is to be determined from the laundry resistance.
  • the residual moisture content is determined via the voltage using the method described above.
  • the frequency f is readjusted in such a way that a constant voltage drop can be measured at the laundry resistor RW.
  • RW 1 2 ⁇ f ⁇ C. 1 2nd Among other things Ub 2nd - 1

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
EP99112258A 1998-06-25 1999-06-25 Procédé et dispositif pour déterminer l'humidité résiduelle du linge dans un sèche-linge Expired - Lifetime EP0967319B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19828207 1998-06-25
DE19828207A DE19828207A1 (de) 1998-06-25 1998-06-25 Verfahren zur Ermittlung des Restfeuchtegehaltes der Wäsche in einem Wäschetrockner sowie Vorrichtung zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP0967319A1 true EP0967319A1 (fr) 1999-12-29
EP0967319B1 EP0967319B1 (fr) 2003-04-23

Family

ID=7871911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99112258A Expired - Lifetime EP0967319B1 (fr) 1998-06-25 1999-06-25 Procédé et dispositif pour déterminer l'humidité résiduelle du linge dans un sèche-linge

Country Status (3)

Country Link
EP (1) EP0967319B1 (fr)
DE (2) DE19828207A1 (fr)
ES (1) ES2193622T3 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1413664A1 (fr) * 2002-10-21 2004-04-28 Bonferraro S.p.A. Procédé et dispositif pour mesurer l'humidité du linge dans une machine à laver ou un sèche-linge
US8578627B2 (en) 2010-10-21 2013-11-12 Whirlpool Corporation Method and apparatus for moisture sensor noise immunity
EP3162952A1 (fr) * 2015-10-26 2017-05-03 Electrolux Appliances Aktiebolag Appareil de séchage de linge avec un degré de séchage de linge capacitif à fonction de détection
WO2019170233A1 (fr) * 2018-03-07 2019-09-12 Electrolux Appliances Aktiebolag Appareil équipé d'un capteur d'humidité capacitif
DE102018113485A1 (de) 2018-06-06 2019-12-12 Miele & Cie. Kg Trockner mit Restfeuchtemesssystem
US11193228B2 (en) 2016-12-28 2021-12-07 Electrolux Appliances Aktiebolag Laundry appliance comprising a humidity sensor
US11686041B2 (en) 2016-12-28 2023-06-27 Electrolux Appliances Aktiebolag Appliance with reliable information of a drying cycle

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19960310A1 (de) * 1999-12-14 2001-06-28 Bsh Bosch Siemens Hausgeraete Vorrichtung und Verfahren zur Messung der Beladung in einem Wäschebehandlungsgerät
DE10242144A1 (de) * 2002-09-04 2004-03-18 E.G.O. Control Systems Gmbh & Co. Kg Wäschetrockner mit Sensoreinrichtung
DE102005048890A1 (de) * 2005-10-12 2007-04-19 BSH Bosch und Siemens Hausgeräte GmbH Haushaltswäschetrockner und Verfahren zum Erkennen einer Drehbewegung einer Trommel
DE102008031774B4 (de) * 2008-07-04 2010-04-15 Ident Technology Ag Sensoreinrichtung zur Bestimmung der Menge und/oder des Feuchtegrads von Wäsche in einem Wäschetrockner
DE102008053184B4 (de) * 2008-10-24 2010-12-23 Amrhein Messtechnik Gmbh Messeinrichtung zur E-Feldmessung im Nahfeld

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765100A (en) * 1971-09-22 1973-10-16 Gen Electric Capacitive sensing dryer control
DE4321322A1 (de) 1992-07-01 1994-01-05 Pleva Gmbh Verfahren und Vorrichtung zur berührungslosen Messung des Restfeuchtegehaltes von flächenförmigen Materialien, insbesondere von bewegten Materialbahnen
DE19651883C1 (de) 1996-12-13 1998-04-02 Telefunken Microelectron Verfahren zur Ermittlung des Trocknungsgrades von Trocknungsgütern und Anordnungen zur Durchführung dieses Verfahrens

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2245778C2 (de) * 1972-09-15 1983-01-13 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Einrichtung zum Steuern des Trocknungsvorganges in einem nach dem Trommelprinzip arbeitenden Wäschetrockner
DE2828704C2 (de) * 1978-06-30 1982-06-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Steuereinrichtung für einen Wäschetrockner
GB2102928A (en) * 1981-07-22 1983-02-09 Philips Electronic Associated Dryness sensing device for a laundry drier
DE3343179C1 (de) * 1983-11-29 1985-10-10 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Waeschetrockner
JP2980737B2 (ja) * 1991-05-24 1999-11-22 津田駒工業株式会社 糊付け機の水分率制御方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765100A (en) * 1971-09-22 1973-10-16 Gen Electric Capacitive sensing dryer control
DE4321322A1 (de) 1992-07-01 1994-01-05 Pleva Gmbh Verfahren und Vorrichtung zur berührungslosen Messung des Restfeuchtegehaltes von flächenförmigen Materialien, insbesondere von bewegten Materialbahnen
DE19651883C1 (de) 1996-12-13 1998-04-02 Telefunken Microelectron Verfahren zur Ermittlung des Trocknungsgrades von Trocknungsgütern und Anordnungen zur Durchführung dieses Verfahrens

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1413664A1 (fr) * 2002-10-21 2004-04-28 Bonferraro S.p.A. Procédé et dispositif pour mesurer l'humidité du linge dans une machine à laver ou un sèche-linge
US8578627B2 (en) 2010-10-21 2013-11-12 Whirlpool Corporation Method and apparatus for moisture sensor noise immunity
CN108138432B (zh) * 2015-10-26 2020-11-17 伊莱克斯家用电器股份公司 具有电容式衣物干燥程度感测功能的衣物器具
EP3162952A1 (fr) * 2015-10-26 2017-05-03 Electrolux Appliances Aktiebolag Appareil de séchage de linge avec un degré de séchage de linge capacitif à fonction de détection
WO2017072016A1 (fr) * 2015-10-26 2017-05-04 Electrolux Appliances Aktiebolag Appareil de lessive à fonction de détection de degré de séchage de linge
CN108138432A (zh) * 2015-10-26 2018-06-08 伊莱克斯家用电器股份公司 具有电容式衣物干燥程度感测功能的衣物器具
US11248334B2 (en) 2015-10-26 2022-02-15 Electrolux Appliances Aktiebolag Laundry appliance with capacitive laundry drying degree sensing function
US10676859B2 (en) 2015-10-26 2020-06-09 Electrolux Appliances Aktiebolog Laundry appliance with capacitive laundry drying degree sensing function
US11193228B2 (en) 2016-12-28 2021-12-07 Electrolux Appliances Aktiebolag Laundry appliance comprising a humidity sensor
US11686041B2 (en) 2016-12-28 2023-06-27 Electrolux Appliances Aktiebolag Appliance with reliable information of a drying cycle
WO2019170233A1 (fr) * 2018-03-07 2019-09-12 Electrolux Appliances Aktiebolag Appareil équipé d'un capteur d'humidité capacitif
US11920272B2 (en) 2018-03-07 2024-03-05 Electrolux Appliances Aktiebolag Appliance with capacitive humidity sensor
DE102018113485A1 (de) 2018-06-06 2019-12-12 Miele & Cie. Kg Trockner mit Restfeuchtemesssystem

Also Published As

Publication number Publication date
ES2193622T3 (es) 2003-11-01
DE19828207A1 (de) 1999-12-30
DE59905142D1 (de) 2003-05-28
EP0967319B1 (fr) 2003-04-23

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