EP0926292A1 - Verfahren zum Bestimmen des Trocknungsfortgangs in einem Trocknungsgang und Maschine zur Durchführung des Verfahrens - Google Patents

Verfahren zum Bestimmen des Trocknungsfortgangs in einem Trocknungsgang und Maschine zur Durchführung des Verfahrens Download PDF

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Publication number
EP0926292A1
EP0926292A1 EP98403088A EP98403088A EP0926292A1 EP 0926292 A1 EP0926292 A1 EP 0926292A1 EP 98403088 A EP98403088 A EP 98403088A EP 98403088 A EP98403088 A EP 98403088A EP 0926292 A1 EP0926292 A1 EP 0926292A1
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EP
European Patent Office
Prior art keywords
drying
air
relative humidity
humidity
machine
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
EP98403088A
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English (en)
French (fr)
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EP0926292B1 (de
Inventor
Jean-Claude Thomson-CSF P.I.D.B. Geay
Antoine Thomson-CSF P.I.D.B. Soulard
Gilles Thomson-CSF P.I.D.B. Ouvrard
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
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Publication date
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Publication of EP0926292A1 publication Critical patent/EP0926292A1/de
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Publication of EP0926292B1 publication Critical patent/EP0926292B1/de
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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
    • 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
    • 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
    • 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
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • D06F2103/28—Air properties
    • D06F2103/34—Humidity
    • 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
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • 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
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • 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
    • D06F2105/50—Starting machine operation, e.g. delayed start or re-start after power cut
    • 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
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 

Definitions

  • the present invention relates to a method for determining of the evolution of drying in a drying process, as well as a machine for implementing this process.
  • the result of the thermistor measurement process depends on parameters that cannot be controlled or not controlled.
  • the measurement result at constant laundry load (type and amount of laundry), depends on the tension power supply (in general, its nominal value can be understood between 187 v and 254 v, and may vary over time) and the accuracy of components in particular due to manufacturing tolerances, these components being those which can influence the drying process (the rated power of the air heater can vary by ⁇ 10%, the temperature of the limiting elements can vary by ⁇ 5 ° C, and the tolerance on the thermistor value can influence ⁇ 3 ° C on the dynamics of drying).
  • the measurement result, at constant environment depends on load to dry (mass and type of laundry).
  • drying phases laundry temperature rise and temperature stabilization phase, drying stage phase, during which the temperature is practically stable, and end of drying phase
  • drying phases laundry are difficult differentiable, which does not allow to foresee sufficiently in advance the end of drying, let alone effectively regulate the power of drying air heating.
  • the result depends, on randomly, load to dry. It's easier to dry, so reliable, a high load than a low load, because in the latter case the result depends on the average position of the load in relation to measuring electrodes. This results in large variations in the measurement in depending on the mass and type of textiles to be dried.
  • the subject of the present invention is a method for determining of the evolution of drying during a drying process of various products, for which the quality of determination does not depend or practically no uncontrollable or uncontrolled parameters, in particular: the voltage of the electricity sector, the dispersion of the values of components or parameters that can influence the drying process (nominal power of the heating element, temperature thresholds in the event of operation close to the admissible limits by the components, temperature as measured by the thermistor or dispersion of electrode measurement results), mass and type of laundry to be dried, power supply cut off, door opened by user, ambient temperature and humidity ...
  • the present invention also relates to a machine (dryer or washer-dryer) using this process, the price of which cost is not significantly increased by this implementation, and that is simple to use and maintain.
  • the process of the invention is characterized in that one predetermines at at least one point in the air circuit the relative humidity of this air for different quantities and / or qualities of products to be dried, which measures, at the start of the drying process, the relative humidity of the drying when the drying air ventilation stops, only when this relative humidity drops below a threshold which is a function of the maximum relative humidity, we are entering the last phase of the drying during which one circulates alternately, in the circuit machine drying air, drying air with at least two different airflows, a determined relationship is established, such as a difference between relative humidity values or relative humidity themselves, for the two different flow rates, for different quantities of products to be dried, that we memorize the laws of evolution of these relationships, and than in normal service, with the same alternations of the same air flow rates, we deduce relations established from measurements, humidity values relative carried out in the same way, the state of drying of the products.
  • the relative humidity measurements are made at using components called ⁇ humidistors ⁇ .
  • the invention is described below with reference to a washer-dryer or a dryer, hereinafter referred to as a machine, but it is of course it can be implemented in various processes of drying using an air flow, this air can be more or less hot.
  • the drying air humidity levels are measured using a component called ⁇ humidity ⁇ .
  • This component is in the form of a capacitor whose dielectric constant is modified as a function of the humidity of the ambient air. The capacity of this capacitor varies depending the relative humidity of the ambient air present between its electrodes.
  • any component can be used in place of the humidity electric whose electrical response varies depending on the humidity of the air ambient, such as resistive components whose resistance varies depending on this humidity. It is understood that if one uses a component other than a humidity, we modify its connection circuit to the processing circuit (microcontroller described below) controlling the drying machine.
  • the humidity relative drying air can vary between 0 and 100%.
  • the precision of relative humidity measurement is generally only necessary at the end of drying, when the relative humidity decrease gradient begins to increase slightly, after remaining substantially constant during the central part of the drying process, and we want to avoid laundry overdrying and saving air heating energy drying.
  • the relative humidity measuring device must be even withstand condensation without damage or drift from its characteristics. The humidity, used as described below, meets these requirements.
  • the invention is particularly intended for machines in which the drying air flow can either be interrupted periodically or take at least two different values.
  • the ventilation flow In one direction of rotation, the ventilation flow is high, the water contained in the laundry is vaporized. By cons, when the air flow is low or zero, the water vaporization is lower.
  • the difference in relative humidity for the two air flows attenuates and tends towards a null value.
  • the water molecules also permeate the ⁇ skin ⁇ (peripheral part) of fibers of the linen that their heart, and those of the "skin" are easily vaporized.
  • the water molecules permeating the heart migrate to the periphery, but this migration movement is relatively slow (its speed depends in particular on the nature of the fibers and the arrangement of the linen in the machine drum). It was found that at the end of drying, this migration speed is low and substantially constant, whatever the drying air flow.
  • the process of the invention takes advantage of this phenomenon by monitoring at least at the end of drying said difference in humidity for determine the end of the drying process.
  • the diagram in FIG. 1 represents the evolution of the relative humidity rate H R for two different masses of wet linen as a function of time.
  • the curves of FIG. 1 are recorded on a prototype or pre-series machine, then their remarkable values are memorized in memories such as ROMs installed on serial machines, to be exploited in the manner described below. These masses are for example 1 and 4 kg.
  • the drying process comprises three phases denoted respectively P0, P1 and P2.
  • each period T comprises a succession of four elementary times: [Dmax, A, Dmin, A], the meanings of which are as follows: Dmax, Dmin: maximum and minimum flow rate respectively, A: stopping the drying air ventilation.
  • Dmax, Dmin maximum and minimum flow rate respectively
  • A stopping the drying air ventilation.
  • the values of Dmax and Dmin are different depending on the phases of the drying process.
  • the values of Dmax and Dmin are respectively 140 m 3 / h and 40 m 3 / h and their respective durations within a period T are 31 seconds and 6 seconds, the downtime A being 2 seconds.
  • the values of the flow rates are the same, but their durations are 12 seconds for Dmax and 25 seconds for Dmin, the downtime A always being 2 seconds.
  • the values cited for this example may all be different in other examples without departing from the scope of the invention.
  • Phase P0 begins with the start of the drying process and ends when the mass of laundry and the parts of the machine heated by the flow of hot drying air have reached the maximum temperature that this hot air can give them. This end of P0 coincides with the instant when the relative humidity H R of the drying air reaches its maximum (H RO ), H R being measured when the ventilation stops (for example after 25 seconds of stop , to be able to obtain a stabilized value of the relative humidity) between two successive periods T, T being as defined above.
  • H RO maximum
  • H R being measured when the ventilation stops (for example after 25 seconds of stop , to be able to obtain a stabilized value of the relative humidity) between two successive periods T, T being as defined above.
  • H RO maximum
  • phase P1 begins phase P1, during which relative humidity values called H R are measured. These values are measured between two periods T, also when the ventilation is stopped, for example after 25 seconds of stop. It can be seen that H R is constant, then decreases appreciably linearly over time, and more rapidly for low loads of laundry.
  • phase P1 The end of phase P1 is determined as follows. We can for example take as a reference the instant when the drying rate of the laundry reaches 20% (the drying rate being defined as the ratio between the mass of water remaining in the laundry and the mass of laundry). Since this drying rate cannot be measured directly in a machine in service with the user, the corresponding relative humidity H R1 is determined in the laboratory, in an identical machine. This rate is noted x. H RO , with o ⁇ x ⁇ 1, and this, for different quantities of damp laundry, H R1 being always measured as described above. For the sake of clarity, only two curves have been shown in FIG. 1, corresponding to wet laundry masses of 1 and 4 kg, but in reality, we proceed with different other masses.
  • Phase P2 begins as soon as the relative humidity drops below x. H RO corresponding.
  • H RO corresponding.
  • two different measurements are made for each load of laundry: a measurement of H R1 as during phase P1, and a measurement of H R2 during elementary times when the drying air flow is equal to Dmin.
  • the measurements of H R1 and H R2 during phase P2 are carried out more often than the measurements of H R1 during phase P1, because their values decrease very rapidly.
  • H RO when the humidity is at its maximum
  • P1 a little before the foreseeable end of P1 (ie shortly before going down to x. H RO )
  • P2 a little before the foreseeable end of P1 (ie shortly before going down to x. H RO )
  • P2 regularly alternating the measurements of H R1 and H R2 until the difference (H R1 - H R2 ) reaches the desired value, which is a function of the drying rate (or a similar indication) displayed by the user.
  • the curves relating to a small load of laundry (a few pieces of laundry) and a maximum load of laundry (about 4 to 5 kg, for a standard machine) are sufficiently distant from each other so that the control circuit of the machine can, even before the end of PO, quickly determine what is the curve relating to any load of laundry to be dried, even if this load differs significantly in composition from that used to establish the curves.
  • the humidity of an air flow being a diffuse phenomenon, and not concentrated in a small area of the section of this flow, the positioning of the humidity does not need to be performed in a specific location. He is by therefore easy to place it in a place where it least risks fouling with fluff from the dried laundry.
  • the method of the invention can be implemented both in drying air exhaust machines than in condensation.
  • the accuracy of determination of the drying rate by determining the average type of product to be drying and its drying characteristics by example by measuring the slope of the curves in Figure 1.
  • nature textile fibers influence the speed of migration of water molecules from their hearts to the surface, so the drying speed.
  • the evaporation of the retained water superficially is fast, and therefore drying is fast, which increases the slope of the corresponding curve. It then suffices to modulate the speed of drying of these products.
  • the circuit 1 shown schematically in Figure 2 comprises, in as a sensor signal processing device and a device for calculation, a digital microcontroller 2.
  • a capacitive main sensor 3, of the type ⁇ humidity ⁇ is connected to an oscillator 4 followed by a setting circuit 5 shaped delivering rectangular signals with variable frequency in depending on the capacity of the sensor 3.
  • the output of circuit 5 is connected to a digital input 6 of the microcontroller 2.
  • the microcontroller 2 is also connected to a memory 8 in which values of drying rate as a function of different relative humidity values and / or relative humidity difference values for the air flow rates of the machine. If you don't have humidity, you can use a resistive humidity sensor (7).
  • This alternative solution has been represented in broken lines in Figure 3.
  • This sensor 7 is connected to an analog input 6 'of the microcontroller 2.
  • This input 6' is connected, inside the microcontroller to an analog / digital converter (not shown).
  • a temperature sensor 9, for example a thermistor, is connected to a other analog input 10 of the microcontroller 2.
  • the microcontroller 2 is obviously programmed for the skilled person by reading the present description.
  • the temperature sensor 9 makes it possible to correct, if if applicable, the information provided by the sensor 3.
  • An air flow sensor 11 is connected to another input 12 of the microcontroller.
  • This input 12 is an analog or digital input, depending on the type of sensor 11. In the simplest case, this sensor 11 is a tachometer integral with the drying air circuit turbine.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
EP98403088A 1997-12-19 1998-12-08 Verfahren zum Bestimmen des Trocknungsfortgangs in einem Trocknungsgang und Maschine zur Durchführung des Verfahrens Expired - Lifetime EP0926292B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9716146 1997-12-19
FR9716146A FR2772898B1 (fr) 1997-12-19 1997-12-19 Procede de determination de l'evolution du sechage dans un processus de sechage, et machine de mise en oeuvre

Publications (2)

Publication Number Publication Date
EP0926292A1 true EP0926292A1 (de) 1999-06-30
EP0926292B1 EP0926292B1 (de) 2003-04-16

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EP98403088A Expired - Lifetime EP0926292B1 (de) 1997-12-19 1998-12-08 Verfahren zum Bestimmen des Trocknungsfortgangs in einem Trocknungsgang und Maschine zur Durchführung des Verfahrens

Country Status (4)

Country Link
EP (1) EP0926292B1 (de)
DE (1) DE69813489T2 (de)
ES (1) ES2195295T3 (de)
FR (1) FR2772898B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2872263A1 (fr) * 2004-06-28 2005-12-30 Brandt Ind Sas Procede de suivi d'un cycle de sechage, notamment pour machine a secher le linge
CN100523359C (zh) * 2005-02-02 2009-08-05 昆山科技大学 电热干燥器的省能自动停机的方法
US9371609B2 (en) 2014-06-24 2016-06-21 General Electric Company Dryer appliances and methods for operating same
DE102017219053A1 (de) 2017-10-25 2019-04-25 BSH Hausgeräte GmbH Verfahren zur Bestimmung von Wäscheeigenschaften in einem Wäschetrockner und hierfür geeigneter Wäschetrockner

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101275553B1 (ko) * 2006-06-09 2013-06-20 엘지전자 주식회사 세탁기 및 그 동작방법
DE102006037239A1 (de) * 2006-08-09 2008-02-14 BSH Bosch und Siemens Hausgeräte GmbH Verfahren und Wäschetrockner bzw. Waschtrockner zum Steuern des Trocknens von feuchter Wäsche
DE102006051504A1 (de) 2006-10-31 2008-05-08 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betreiben eines Hausgeräts zur Pflege von Wäschestücken

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1290592A (fr) * 1960-05-19 1962-04-13 Gen Motors Corp Séchoir à linge
GB2275992A (en) * 1993-03-08 1994-09-14 Europ Gas Turbines Ltd Controlling tumble dryers
US5570520A (en) * 1995-05-17 1996-11-05 Eaton Corporation Clothes dryer dryness detection system
US5649372A (en) * 1996-03-14 1997-07-22 American Dryer Corporation Drying cycle controller for controlling drying as a function of humidity and temperature
JPH09285696A (ja) * 1996-04-22 1997-11-04 Matsushita Electric Ind Co Ltd 衣類乾燥機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1290592A (fr) * 1960-05-19 1962-04-13 Gen Motors Corp Séchoir à linge
GB2275992A (en) * 1993-03-08 1994-09-14 Europ Gas Turbines Ltd Controlling tumble dryers
US5570520A (en) * 1995-05-17 1996-11-05 Eaton Corporation Clothes dryer dryness detection system
US5649372A (en) * 1996-03-14 1997-07-22 American Dryer Corporation Drying cycle controller for controlling drying as a function of humidity and temperature
JPH09285696A (ja) * 1996-04-22 1997-11-04 Matsushita Electric Ind Co Ltd 衣類乾燥機

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 098, no. 003 27 February 1998 (1998-02-27) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2872263A1 (fr) * 2004-06-28 2005-12-30 Brandt Ind Sas Procede de suivi d'un cycle de sechage, notamment pour machine a secher le linge
EP1612319A1 (de) * 2004-06-28 2006-01-04 Brandt Industries Verfahren zur Ueberwachung eines Trocknungszykluses insbesondere für einen Wäschetrockner
CN100523359C (zh) * 2005-02-02 2009-08-05 昆山科技大学 电热干燥器的省能自动停机的方法
US9371609B2 (en) 2014-06-24 2016-06-21 General Electric Company Dryer appliances and methods for operating same
DE102017219053A1 (de) 2017-10-25 2019-04-25 BSH Hausgeräte GmbH Verfahren zur Bestimmung von Wäscheeigenschaften in einem Wäschetrockner und hierfür geeigneter Wäschetrockner

Also Published As

Publication number Publication date
FR2772898B1 (fr) 2000-03-17
DE69813489T2 (de) 2004-04-08
DE69813489D1 (de) 2003-05-22
FR2772898A1 (fr) 1999-06-25
ES2195295T3 (es) 2003-12-01
EP0926292B1 (de) 2003-04-16

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