EP0926292B1 - Procédé de détermination de l'évolution du séchage dans un processus de séchage, et machine de mise en oeuvre - Google Patents
Procédé de détermination de l'évolution du séchage dans un processus de séchage, et machine de mise en oeuvre Download PDFInfo
- Publication number
- EP0926292B1 EP0926292B1 EP98403088A EP98403088A EP0926292B1 EP 0926292 B1 EP0926292 B1 EP 0926292B1 EP 98403088 A EP98403088 A EP 98403088A EP 98403088 A EP98403088 A EP 98403088A EP 0926292 B1 EP0926292 B1 EP 0926292B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drying
- relative humidity
- machine
- air
- values
- 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
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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 quantity 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 that 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 the 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, and even less to 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 the evolution of drying during a drying process for various products, for which the quality of the determination does not depend or practically does not depend non-controllable or uncontrolled parameters, in particular: the voltage of the electrical sector, the dispersion of component or parameter values can influence the drying process (nominal power of the element heating, temperature thresholds when operating close to limits admissible by the components, temperature as measured by the thermistor or dispersion of the electrode measurement results), mass and type of laundry to be dried, cut off from the power supply, door opening by user, ambient temperature and humidity ...
- the present invention also relates to a machine (dryer or washer-dryer) using this process, the cost price of which is not significantly increased by this implementation, and which is simple to use and maintain.
- the relative humidity measurements are made using components called “humidistors”.
- the invention is described below with reference to a washer-dryer or to a dryer, hereinafter referred to as a machine, but it is fine understood that it can be used in various drying processes at using an air flow, this air can be more or less hot.
- the rates drying air humidity are measured using a component called "Humidistance".
- This component is in the form of a capacitor whose dielectric constant is modified according to the humidity of the air ambient.
- the capacity of this capacitor varies according to the relative humidity ambient air present between its electrodes.
- any electrical component whose response electric varies according to the humidity of the ambient air, like for example resistive components whose resistance varies as a function of this humidity. he it is understood that if a component other than a humidity is used, changes his 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 from 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 rate is high (approximately 150 m 3 / h)
- the flow is lower (approximately 40 m 3 / h).
- 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 linen fibers as 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 series 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
- P0 of fixed duration equal to the greatest value measured in the laboratory on pre-series machines.
- the measurement frequency of H R can be variable depending on the machine and the mass of laundry.
- 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, for different quantities of wet 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.
- the machine control device it is therefore sufficient for the machine control device to carry out a few humidity rate measurements (by means of frequency measurements) at “characteristic” instants, that is to say at the start of drying, to determine H RO (when the humidity is at its maximum), then a little before the foreseeable end of P1 (that is to say a short time before going down to x. H RO ), and then periodically during of P2, by 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 to a maximum load of laundry (approximately 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 the 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 main capacitive sensor 3, of the type "humidity” is connected to an oscillator 4 followed by a circuit 5 of setting in shape delivering variable frequency rectangular signals 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 a 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 on 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.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Description
- mesure, au début du processus de séchage, d'une humidité relative maximale de l'air de séchage, à l'arrêt de la ventilation d'air de séchage ;
- mise en oeuvre, lorsque cette humidité relative descend en-dessous d'un seuil qui est fonction de ladite humidité relative maximale, d'une dernière phase du processus de séchage, au cours de laquelle on fait alternativement circuler, dans le circuit d'air de séchage de la machine, de l'air de séchage avec au moins deux débits différents ;
- mesure des valeurs d'humidité relative pour les deux débits différents ;
- comparaison d'une relation établie à partir desdites mesures de valeurs d'humidité relative avec une relation prédéterminée dépendante d'une quantité de produit à sécher ; et
- déduction de l'état de séchage des produits en fonction du résultat de ladite comparaison.
- la figure 1 est un diagramme montrant l'évolution d'une relation de différence de valeurs d'humidité relative pour différentes charges de linge, conformément à l'invention, et
- la figure 2 est un bloc-diagramme d'un exemple de circuit de détermination du degré de séchage, conforme à l'invention.
Claims (9)
- Procédé de détermination de l'évolution du séchage au cours d'un processus de séchage comprenant plusieurs phases de séchage (P0, P1, P2), mis en oeuvre dans une machine dans laquelle on fait circuler un courant d'air chauffé, caractérisé en ce qu'il comprend les étapes suivantes :mesure, au début du processus de séchage, d'une humidité relative maximale (HRO) de l'air de séchage, à l'arrêt de la ventilation d'air de séchage ;mise en oeuvre, lorsque cette humidité relative descend en-dessous d'un seuil (x, HRO) qui est fonction de ladite humidité relative maximale (HRO), d'une dernière phase (P2) du processus de séchage, au cours de laquelle on fait alternativement circuler, dans le circuit d'air de séchage de la machine, de l'air de séchage avec au moins deux débits différents (D1, D2) ;mesure des valeurs d'humidité relative (HR1, HR2) pour les deux débits différents (D1, D2);comparaison d'une relation établie à partir desdites mesures de valeurs d'humidité relative (HR1, HR2) avec une relation prédéterminée dépendante d'une quantité de produit à sécher ; etdéduction de l'état de séchage des produits en fonction du résultat de ladite comparaison.
- Procédé selon la revendication 1, caractérisé en ce que ladite relation prédéterminée est une différence entre des valeurs d'humidité relative mesurées pour les deux débits différents.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on mesure en outre la température de l'air de séchage en au moins un point de son circuit, afin de corriger, le cas échéant, les mesures d'humidité relative.
- Procédé selon l'une des revendications précédentes, caractérisé en ce que l'on mesure la pente de la loi d'évolution de l'humidité relative, afin de tenir compte du type du produit à sécher et de ses caractéristiques de séchage.
- Machine de séchage de produits par un courant d'air de séchage, comportant un microcontrôleur (2) auquel est relié au moins un capteur d'humidité relative (3, 7), caractérisée en ce qu'elle comprend un capteur (11) de débit d'air de séchage relié au microcontôleur (2) et une mémoire (8) dans laquelle sont stockées des valeurs de taux de séchage en fonction de valeurs de différences d'humidité relative pour les débits d'air de la machine (D1, D2).
- Machine selon la revendication 5, caractérisée en ce que l'un au moins des capteurs d'humidité relative (3) est un capteur capacitif du type "humidistance".
- Machine selon l'une des revendications 5 ou 6, caractérisée en ce que l'un au moins des capteurs d'humidité relative (7) est un capteur résistif.
- Machine selon la revendication 5 à 7, caractérisée en ce qu'elle comporte en outre au moins un capteur (9) de température d'air de séchage.
- Machine selon l'une des revendications 5 à 8, caractérisée en ce qu'elle est un sèche-linge ou une lavante-séchante.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
FR9716146 | 1997-12-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0926292A1 EP0926292A1 (fr) | 1999-06-30 |
EP0926292B1 true EP0926292B1 (fr) | 2003-04-16 |
Family
ID=9514835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98403088A Expired - Lifetime EP0926292B1 (fr) | 1997-12-19 | 1998-12-08 | Procédé de détermination de l'évolution du séchage dans un processus de séchage, et machine de mise en oeuvre |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0926292B1 (fr) |
DE (1) | DE69813489T2 (fr) |
ES (1) | ES2195295T3 (fr) |
FR (1) | FR2772898B1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019081448A1 (fr) | 2017-10-25 | 2019-05-02 | BSH Hausgeräte GmbH | Procédé permettant de déterminer des caractéristiques du linge dans un sèche-linge et sèche-linge approprié pour ledit procédé |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2872263B1 (fr) * | 2004-06-28 | 2006-11-10 | 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 |
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 |
US9371609B2 (en) | 2014-06-24 | 2016-06-21 | General Electric Company | Dryer appliances and methods for operating same |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB901954A (en) * | 1960-05-19 | 1962-07-25 | Gen Motors Corp | Improvements in or relating to clothes dryers |
GB2275992B (en) * | 1993-03-08 | 1997-01-08 | Europ Gas Turbines Ltd | Process and apparatus for drying articles or materials |
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 |
-
1997
- 1997-12-19 FR FR9716146A patent/FR2772898B1/fr not_active Expired - Fee Related
-
1998
- 1998-12-08 DE DE69813489T patent/DE69813489T2/de not_active Expired - Lifetime
- 1998-12-08 EP EP98403088A patent/EP0926292B1/fr not_active Expired - Lifetime
- 1998-12-08 ES ES98403088T patent/ES2195295T3/es not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019081448A1 (fr) | 2017-10-25 | 2019-05-02 | BSH Hausgeräte GmbH | Procédé permettant de déterminer des caractéristiques du linge dans un sèche-linge et sèche-linge approprié pour ledit procédé |
Also Published As
Publication number | Publication date |
---|---|
DE69813489T2 (de) | 2004-04-08 |
FR2772898A1 (fr) | 1999-06-25 |
EP0926292A1 (fr) | 1999-06-30 |
FR2772898B1 (fr) | 2000-03-17 |
DE69813489D1 (de) | 2003-05-22 |
ES2195295T3 (es) | 2003-12-01 |
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