EP0898008B1 - Procédé pour déterminer le chargement d'un sèche -linge - Google Patents

Procédé pour déterminer le chargement d'un sèche -linge Download PDF

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Publication number
EP0898008B1
EP0898008B1 EP98114947A EP98114947A EP0898008B1 EP 0898008 B1 EP0898008 B1 EP 0898008B1 EP 98114947 A EP98114947 A EP 98114947A EP 98114947 A EP98114947 A EP 98114947A EP 0898008 B1 EP0898008 B1 EP 0898008B1
Authority
EP
European Patent Office
Prior art keywords
frequency
pulses
measurement signal
microcontroller
laundry
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 - Lifetime
Application number
EP98114947A
Other languages
German (de)
English (en)
Other versions
EP0898008A1 (fr
Inventor
Hansjörg Dipl.-Ing. Meerpohl
Dietmar Dipl.-Ing. Pech
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP0898008A1 publication Critical patent/EP0898008A1/fr
Application granted granted Critical
Publication of EP0898008B1 publication Critical patent/EP0898008B1/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
    • D06F34/04—Signal transfer or data transmission arrangements
    • 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
    • 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
    • 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 present invention relates to a method for determining the amount of loading a clothes dryer according to the preamble of claim 1.
  • the drying process plays alongside the moisture and the type of laundry that is usual is dried in a drum, including the load the dryer plays a big role. Therefore, for various reasons, it is about for accurate remaining time prediction, for optimal control of the drying process or for customized heating output, advantageous, the load to determine the dryer.
  • Methods for determining the amount of loading of are from the prior art Tumble dryers known, which are based on the evaluation of temperature or temperature gradient measurements, on the current draw of the motor to move the laundry drum or based on a measurement of the electrical capacity of the drum.
  • DE 4 403 625 A describes a method for determining the loading quantity of Tumble dryers are known, in which the signal duration of the resistance measuring device is used as a measure of the load.
  • DE 29 45 696 A1 describes a method for determining the amount of loading known from tumble dryers, in which the electrical conductivity of the laundry is used becomes.
  • two electrodes are attached in the drum, which temporarily touch the laundry when the drum is rotated and by means of which determines the electrical conductivity.
  • This master value signal which with the Movement of laundry in the drum varies and has impulses is to a threshold circuit connected to the concern of a piece of laundry, even in dry ones State on the electrodes indicates by a hit signal of constant height delivers, which is then integrated.
  • the integration of this Hit signals represent a measure of the load of the tumble dryer that is used for Control of the drying process can be used.
  • the present invention is therefore based on the object of a method for determination the loading amount of tumble dryers of the type mentioned in the beginning to improve that the measure of laundry loading with digital building blocks simple is to be further processed, and also a more reliable determination of the loading quantity very little conductive laundry items is made possible.
  • the frequency of the pulses of the measurement signal of the electrical conductivity of the laundry determined and used as a measure of the load.
  • edges of the conductance measurement signal are advantageously detected, in particular by forming a time derivative (differentiation) and by determining it Frequency determines the frequency of the pulses of the conductance measurement signal.
  • the pulses of the conductance measurement signal compared with a threshold value and by counting the pulses from a certain Threshold per unit of time, the frequency of the pulses is determined that the Exceed or fall below the threshold. Because the comparison with a threshold particularly easy by using a comparator or a Schmidt trigger can be implemented in terms of circuit technology, the invention in this way particularly can be used easily and inexpensively.
  • the frequency of this Impulse determined and used as a measure of the amount of loading.
  • Triggering pulses of constant duration will make the occurrence extremely short or extreme long pulses avoided with a limited temporal responsiveness of the subsequent components make it difficult to reliably determine the load.
  • the determination of the frequency of the pulses of the Conductivity measurement signal carried out by means of a microcontroller, the frequency determination enabled with a low component cost and as a rule central Control device of the dryer directly via the necessary information on the load quantity can dispose of.
  • each of the aforementioned steps can advantageously be carried out in the course of the processing of the conductance measurement signal for determining the frequency of its pulses also in one digital electronic computer or a microcontroller can be implemented. Because a function is carried out in an already existing microcontroller will always result in a saving that would otherwise have to be carried out Function necessary device and thus a lower component and circuit complexity, which also leads to a lower probability of failure of the dryer leads.
  • the determination of the frequency of the pulses of the conductance measurement signal but also the determination of all others as a measure of the loading quantity serving frequencies performed particularly advantageously with a microcontroller become.
  • the frequency measurement, whatever impulses or events, can be with a microcontroller with very little circuitry and very high accuracy Carry out, as opposed to analog circuits, digital signals can process particularly advantageously.
  • the comparison of the conductance measurement signal with a predetermined one can be particularly advantageous Carry out the threshold with a microcontroller. This can be done using the microcontroller assigned or implemented in it analog / digital converter can be used or a special input of the microcontroller, such as an input with Schmidt trigger or comparator that can perform this comparison function.
  • this must be analog Process signals only with an intermediate analog / digital converter is possible.
  • the latter can be assigned externally to the microcontroller or also in be integrated.
  • an assigned analog / digital converter can be processed by both analog and also digital signals all previously mentioned methods are carried out, so that in a tumble dryer also use several of the aforementioned methods can come.
  • FIG. 1 shows a schematic circuit structure to carry out an embodiment of the method according to the invention.
  • the drum 1 has an electrode 12, wherein as second electrode serves the drum 1 itself.
  • the drum 1 is connected to the mass 5 of the dryer and the electrode 12 connected to a constant voltage 6 via a series resistor 13.
  • the laundry in the drum 1 has a laundry resistance 14, on the one hand over the drum 1 with the mass 5 of the dryer and on the other hand via the electrode 12 with the Resistor 13 is connected and thus forms a voltage divider with this.
  • a measurement signal 15 is obtained which serves as a measure of the laundry conductance.
  • This Conductivity measurement signal is connected to the input of a differentiator 2, the one Output signal 21 generated.
  • This output signal 21 of the differentiator 2 is in turn connected to the input of a monostable multivibrator 3, the Output signal 31 finally connected to an input of a microcontroller 4 is.
  • the load of the tumble dryer is determined when moving the laundry in the drum 1 by rotating it.
  • the laundry gets at least at times in contact with the electrode 12, which is a time-varying conductivity measurement signal 15 results. Every time the electrode 12 is touched by a piece of laundry or any change in that measured between the electrode 12 and the drum 1 Laundry resistance 14, the conductance measurement signal 15 jumps or have an impulse. The number of these pulses per unit of time is therefore a measure of the load of the dryer. Because the conductance measurement signal is very irregular and determining the frequency of the pulses is difficult, this signal must be suitable be processed. For this purpose, the slope of the pulses is determined using a differentiator 2 of the conductance measurement signal 15 is determined and thus detected by their edges.
  • each of the detected edges which are contained in the output signal 21 of the differentiator 2 are, triggers a pulse of constant duration by means of a monostable multivibrator 3.
  • the output signal 31 of the monostable multivibrator 3, which the pulses more constant Duration is connected to a digital input of a microcontroller 4.
  • the Microcontroller 4 counts the pulses of signal 31 received per unit of time and determines them so their frequency, which is a direct measure of the load quantity.
  • the solution according to the invention thus becomes a method for determining the loading quantity created a dryer with which the measure of the load is available in digital form. This makes it easier to process through digital Building blocks, especially by a microcontroller, and a more precise determination the load quantity possible.
  • a microcontroller for control of the drying process, it is possible in this way that directly in the microcontroller the necessary information on the load quantity is available.

Claims (11)

  1. Procédé pour déterminer la quantité de chargement d'un sèche-linge dans lequel le linge est déplacé dans un tambour, la conductance électrique du linge est déterminée au moyen d'électrodes qui sont en contact au moins par moments avec le linge, et le signal de mesure de la conductance électrique présente des impulsions, caractérisé en ce que la fréquence des impulsions du signal de mesure (15) de la conductance électrique est déterminée et sert de mesure pour la quantité de chargement.
  2. Procédé selon la revendication 1, caractérisé en ce qu'une détection des flancs du signal de mesure de la conductance est exécutée, en particulier par la formation d'une dérivation temporaire (différenciation), et dont la fréquence sert de mesure pour la quantité de chargement.
  3. Procédé selon la revendication 1, caractérisé en ce que les impulsions du signal de mesure de la conductance sont comparées à une valeur de seuil, et la fréquence des impulsions qui sont supérieures ou inférieures à la valeur de seuil est déterminée.
  4. Procédé selon la revendication 2, caractérisé en ce que les flancs détectés déclenchent respectivement une impulsion de durée constante, et la fréquence de ces impulsions sert de mesure pour la quantité de chargement.
  5. Procédé selon la revendication 3, caractérisé en ce qu'une impulsion de durée constante est déclenchée lorsque le seuil prédéfini est dépassé ou en sous-dépassement, et la fréquence de ces impulsions sert de mesure pour la quantité de chargement.
  6. Procédé selon la revendication 1, caractérisé en ce que la détermination de la fréquence est réalisée au moyen d'un microcontrôleur (4).
  7. Procédé selon la revendication 2, caractérisé en ce que la détection des flancs du signal de mesure de la conductance et/ou la détermination de la fréquence des flancs détectés est réalisée au moyen d'un microcontrôleur (4).
  8. Procédé selon la revendication 3, caractérisé en ce que la comparaison des impulsions du signal de mesure de la conductance avec une valeur de seuil et/ou la détermination de la fréquence des impulsions qui sont supérieures ou inférieures à la valeur de seuil, est réalisée au moyen d'un microcontrôleur (4).
  9. Procédé selon la revendication 4, caractérisé en ce que la détection des flancs du signal de mesure de la conductance et/ou le déclenchement d'une impulsion à durée constante et/ou la détermination de la fréquence des impulsions à durée constante est réalisée au moyen d'un microcontrôleur (4).
  10. Procédé selon la revendication 5, caractérisé en ce que la comparaison du signal de mesure de la conductance avec une valeur de seuil et/ou le déclenchement d'une impulsion à durée constante en cas de dépassement ou de sous-dépassement et/ou la détermination de la fréquence des impulsions à durée constante est réalisée au moyen d'un microcontrôleur (4).
  11. Procédé selon l'une des revendications 6 à 10, caractérisé en ce qu'un convertisseur analogique/numérique, qui traite les signaux analogiques apparaissant dans le procédé, est attribué au microcontrôleur (4).
EP98114947A 1997-08-21 1998-08-07 Procédé pour déterminer le chargement d'un sèche -linge Expired - Lifetime EP0898008B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19736422 1997-08-21
DE19736422A DE19736422A1 (de) 1997-08-21 1997-08-21 Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners

Publications (2)

Publication Number Publication Date
EP0898008A1 EP0898008A1 (fr) 1999-02-24
EP0898008B1 true EP0898008B1 (fr) 2002-06-26

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US (1) US6466037B1 (fr)
EP (1) EP0898008B1 (fr)
DE (2) DE19736422A1 (fr)

Families Citing this family (12)

* 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
DE10200975C2 (de) * 2001-03-02 2003-08-28 Whirlpool Co Verfahren zum Verändern des Programmablaufes bei einem Haushaltswäschetrockner
KR100480725B1 (ko) * 2002-11-26 2005-04-07 엘지전자 주식회사 건조기의 포량감지장치
KR100480929B1 (ko) * 2003-08-12 2005-04-07 엘지전자 주식회사 의류건조기의 건조 제어방법
CA2505565C (fr) * 2005-04-28 2008-09-16 Camco Inc. Dispositif et methode de commande d'un seche-linge
DE602007011731D1 (de) * 2007-04-30 2011-02-17 Electrolux Home Prod Corp Verfahren zum Steuern eines Trommelwäschetrockners
CA2629495A1 (fr) * 2008-04-18 2009-10-18 Mabe Canada Inc. Controleur de secheuse
DE102008025496A1 (de) * 2008-05-28 2009-12-03 BSH Bosch und Siemens Hausgeräte GmbH Messanordnung zur Ermittlung einer Information über die Beladung eines Wäschetrockners
DE102008041265A1 (de) * 2008-08-14 2010-02-18 BSH Bosch und Siemens Hausgeräte GmbH Kondensationstrockner mit einer Wärmepumpe und Erkennung eines unzulässigen Betriebszustands
US8578627B2 (en) 2010-10-21 2013-11-12 Whirlpool Corporation Method and apparatus for moisture sensor noise immunity
JP5974290B2 (ja) * 2012-09-19 2016-08-23 パナソニックＩｐマネジメント株式会社 ドラム式洗濯乾燥機
JP5974291B2 (ja) * 2012-09-19 2016-08-23 パナソニックＩｐマネジメント株式会社 衣類乾燥機

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE4403625A1 (de) * 1994-02-05 1995-08-10 Miele & Cie Wäschetrockner mit einer Vorrichtung zur Ermittlung der Beladungsmenge

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DE2945696C2 (de) * 1979-11-13 1982-12-30 Ako-Werke Gmbh & Co., 7988 Wangen Schaltungsanordnung zur Steuerung eines Wäschetrockners
DE3171805D1 (en) * 1981-06-19 1985-09-19 Verzinkerei Zug Ag Method of drying laundry and machine for carrying out the method
US4422247A (en) * 1981-06-29 1983-12-27 Whirlpool Corporation Low voltage sensor for a dryer
US4738034A (en) * 1985-12-16 1988-04-19 Kabushiki Kaisha Toshiba Drying machine
US5450015A (en) * 1994-02-24 1995-09-12 Forte Technology, Inc. Apparatus for measuring impedance to determine a property of a material
US5514973A (en) * 1994-07-11 1996-05-07 The United States Of America As Represented By The Secretary Of Agriculture System for analyzing moisture content of materials such as cotton

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4403625A1 (de) * 1994-02-05 1995-08-10 Miele & Cie Wäschetrockner mit einer Vorrichtung zur Ermittlung der Beladungsmenge

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DE19736422A1 (de) 1999-02-25
DE59804563D1 (de) 2002-08-01
EP0898008A1 (fr) 1999-02-24
US6466037B1 (en) 2002-10-15

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