EP3144425B1 - Method for operating a laundry dryer - Google Patents

Method for operating a laundry dryer Download PDF

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Publication number
EP3144425B1
EP3144425B1 EP16187187.6A EP16187187A EP3144425B1 EP 3144425 B1 EP3144425 B1 EP 3144425B1 EP 16187187 A EP16187187 A EP 16187187A EP 3144425 B1 EP3144425 B1 EP 3144425B1
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EP
European Patent Office
Prior art keywords
moisture
tumble dryer
stored
gradient threshold
course
Prior art date
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EP16187187.6A
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German (de)
French (fr)
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EP3144425A1 (en
Inventor
Rebecca Grill
Pascal Hain
Kay Schmidt
Steffen Weiss
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.)
EGO Elektro Geratebau GmbH
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EGO Elektro Geratebau GmbH
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Priority to PL16187187T priority Critical patent/PL3144425T3/en
Publication of EP3144425A1 publication Critical patent/EP3144425A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • 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
    • 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
    • D06F2103/38—Time, e.g. duration
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/28—Electric heating
    • 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
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting

Definitions

  • the invention relates to a method for operating a tumble dryer in order to dry wet laundry.
  • the purpose of the invention is to control the drying process as a function of a largely automated detection of the main substance content or the main fibers of the laundry to be dried.
  • the invention has for its object to provide an aforementioned method, with the problems and disadvantages of the prior art can be avoided and it is particularly possible to provide a practical method, with the operation of a tumble dryer, the main fiber content of the to be dried Laundry can be detected to adjust the operation of the tumble dryer, especially in terms Temperature profile or maximum temperature. This way, sensitive fibers can be spared.
  • the humidity of the air in the tumble dryer or the time course is detected or measured.
  • the absolute humidity or humidity can be measured, for which purpose a correspondingly suitable humidity sensor can be used for an absolute humidity measurement, as described for example in US Pat aforementioned DE 102006053274 A1 is disclosed.
  • the relative humidity in the air in the tumble dryer can be measured with a corresponding humidity sensor.
  • Such humidity sensors for a relative humidity measurement are now available inexpensively and work sufficiently accurately.
  • the temperature of the air in the tumble dryer can advantageously be recorded in the course of time, in order in turn to be able to infer the values for the required moisture.
  • the measurement or detection can only begin after 1 to 3 minutes in order to rule out prevailing inaccuracies at the very beginning.
  • the course of the measured moisture is compared with stored curves over time for the moisture.
  • a slope of the course of the measured moisture ie its slope values, can be compared with stored slope limit values of the moisture.
  • corresponding gradients and / or slope limits are stored, namely for fibers from the group cotton, wool, synthetic fibers. Mainly such a synthetic fiber is PE or polyamide.
  • These gradients or slope limits can be stored in a memory of a tumble dryer control.
  • Corresponding courses can be stored for the stored time profiles, that is to say curves which can be stored as a diagram or really as a continuous continuous course over time, for example for the first 10 minutes to 15 minutes.
  • slope limit values simple values can be stored without a time course, for example as maximum gradient limit values.
  • the slope limits are stored with a certain time, ie the time at which they are typically exceeded or exceeded, depending on the main fiber content or proportion of substance in the laundry to be dried.
  • these slope limits may be between 1 minute to 3 minutes and 10 minutes to 15 minutes, advantageously between 3 minutes and 10 minutes. This is just the beginning of the drying process.
  • slope values are compared at certain times, in particular during the ascent, then this is usually simpler and possibly even more accurate.
  • a stored upper gradient limit value is exceeded, a major proportion of the material to be dried is recognized by synthetic fibers.
  • a stored lower slope limit value is exceeded, a major substance content is recognized with wool or wool fibers.
  • the detected slope limit is between the upper and lower slope limits, then a major proportion of cotton or cotton fiber is detected. This can, as I said, be made at a good time. In this alternative, easily recognizable, an evaluation or detection easier. It only needs to be determined at a certain time, for example, after 3 minutes to 10 minutes, the slope value from the detected time course of the moisture, which is easy. Then, this detected slope value is compared with the stored slope limit values and a classification of the laundry to be dried into one of the three categories is made.
  • the operation of the tumble dryer or the drying process can be adjusted.
  • wool whereby here comes to the fact that the speed or the drum movement of the tumble dryer should be rather slow or gentle, since wool is relatively sensitive. Overall, this is less important for cotton, as it can be dried relatively easily with high temperatures and strong drum movement.
  • the slope limit values can not only be stored as individual values at exactly one point in time, but also as a diagram or as a time course. Then several times, that is to say at several points in time, it may then be attempted to detect these slope values and to compare them with the stored slope limit values at given times.
  • the temperature in the tumble dryer can be recorded in their time course.
  • a detection of the absolute humidity makes it possible, at least if at the beginning of the drying process, the temperature is detected in the tumble dryer over time, then to determine the relative humidity.
  • a temperature sensor and a humidity sensor can be formed separately from each other to use each accurate and cost-effective sensors can.
  • the relative humidity in the tumble dryer can be measured directly with a corresponding humidity sensor, which is designed for relative humidity measurement. Also, it is possible to additionally detect by means of a temperature sensor, the temperature of the air in the dryer in the time course to gain more information. In particular, it can then be calculated from the absolute humidity. Here too, at least at the beginning of the drying process, the temperature of the air in the tumble dryer should be recorded in addition to the moisture.
  • the operation of the laundry dryer is precisely adapted to it. This applies to temperature profile, maximum temperature, drum movement, speed and / or duration of the drying process. So on the one hand damage to the fibers or the laundry to be dried can be avoided. On the other hand, the drying process can be carried out as quickly and / or energy-efficiently as possible.
  • a clothes dryer 11 is shown for the method according to the invention.
  • the presentation is limited to the functionally essential parts and is only intended to illustrate how these essential parts work.
  • a load compartment 12 is laundry 14 with a residual moisture after washing or spinning.
  • This cargo space 12 is usually rotated or rotated, but this does not play a significant role for the invention.
  • Air is introduced into the loading space 12 via an air inlet 16.
  • the air flow is generated by the fan 17, 18 air is heated by the downstream heater for drying the laundry 14.
  • an air outlet 20 leads out of the loading space 12 to the outside, which identifies the tumble dryer 11 as an exhaust air dryer.
  • the warm air is thus, as known from such dryers, supplied to the laundry 14, absorbs moisture and transports them through the air outlet 20 to the outside, so as to dry the laundry.
  • a humidity sensor 22 is arranged in the air outlet 20.
  • a humidity sensor 22 is known to the person skilled in the art and need not be explained in detail here.
  • the humidity sensor 22 is connected to a controller 24, as well as the fan 17 and the heater 18.
  • the controller 24 has a memory 25, possibly also integrated therein, in which various values or gradients can be stored, which will be discussed in more detail below becomes.
  • a temperature sensor 23 is arranged in the air outlet 20, which is also connected to the controller 24. It is advantageous a conventional temperature sensor, particularly advantageous with resistance measurement.
  • the moisture sensor 22 may advantageously be designed to measure the absolute humidity, that is, the exhaust air in the air outlet 20. Alternatively, it may also be a humidity sensor for a relative humidity measurement, which may be less expensive.
  • the temperature sensor 23 is provided in the air outlet 20. Here it is located just before the humidity sensor 22, but can also be arranged opposite or shortly behind it. Such a tumble dryer is in Essentially from the aforementioned DE 102006053274 A1 to which reference is explicitly made in this regard.
  • the invention can also be applied to a condensation dryer in a modified form.
  • a corresponding moisture sensor is provided in an air outlet of the cargo space in front of a downstream condensation device.
  • the moisture in the exhaust air can be detected there as well.
  • the dashed thin pattern PE shows an amount of 1.2 kg of laundry from polyester fibers and a humidity of 40%.
  • the thin dot-dash line WO shows an amount of 1.2 kg of wool laundry with a humidity of 40%.
  • the above-mentioned rise range or the beginning of the drying process is considered here in the first minutes, measured for a maximum of the first 15 minutes, advantageously for the first 3 minutes to 10 minutes. It can be seen in this rise range that the course is indeed similar, but depending on the type of fibers of the laundry has different pitch, which of course results in different courses.
  • the lowest slope is expected to WO for wool. In between are the two courses C01 and CO2 for cotton, whereby, as expected, the course for the larger amount of moist cotton than course CO2 is steeper and rises higher than for the smaller amount of cotton than course C01.
  • a stored lower slope limit S GU which is also shown dotted, may be between the slope values of the curves C01 and WO.
  • the upper slope threshold S GO is exceeded or fallen below and the lower slope limit S GU is exceeded or not reached, a division into the fiber groups PE, CO or WO, ie Synthetic fibers, cotton or wool, are made. Whether the actual slope value is actually recorded exactly plays a minor role, as long as the measurement is accurate enough to reliably, reliably and accurately determine whether or not one of the gradient limit values is exceeded or undershot. Even though the differences in the slope values in the Fig. 2 do not look very clear, so they are already calculated.
  • the slope value S PE is about 25% greater than the slope limit S GO , although it does not look like it.
  • a measurement relatively early after the start of the drying process or in its initial phase, for example after the said 3 minutes, not only has the advantage that it then very early detection of the exclusive or main substance content is possible, for example, in sensitive fibers such as synthetic fibers or wool to choose a maximum temperature rather low and possibly also to choose a speed low, so that damage can be avoided. Furthermore, here are just the increases still very different, so that even a particularly good detection or differentiation of the respective slope values is possible. At the time t 10 minutes, a distinction would not be so good or actually no longer possible.
  • these basic courses or course types could also be stored and, by comparing a course of the humidity recorded in the air outlet 20 over time with a stored course, a conclusion can be drawn on the main substance portion in the laundry 14. For this purpose, however, at least the achievement of the maximum value and a subsequent drop would have to wait to be expected. On the one hand, this means a certain waiting time until detection. On the other hand, if the laundry 14 is dried at a very high temperature, damage to the more sensitive synthetic fibers or wool may possibly already occur. In this respect, comparing the slope values is considered the most advantageous option because it is also very fast.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Description

Anwendungsgebiet und Stand der TechnikField of application and state of the art

Die Erfindung betrifft ein Verfahren zum Betrieb eines Wäschetrockners, um damit feuchte Wäsche zu trocknen. Insbesondere geht es bei der Erfindung darum, den Trocknungsvorgang zu steuern in Abhängigkeit von einer möglichst weitgehend automatisierten Erkennung des hauptsächlichen Stoffanteils bzw. der hauptsächlichen Fasern der zu trocknenden Wäsche.The invention relates to a method for operating a tumble dryer in order to dry wet laundry. In particular, the purpose of the invention is to control the drying process as a function of a largely automated detection of the main substance content or the main fibers of the laundry to be dried.

Aus der DE 102006053274 A1 ist es bekannt, die absolute Luftfeuchte im Wäschetrockner zu messen. Daraus können die Beladungsmenge, insbesondere als Gewicht, und die Restfeuchte der Wäsche bestimmt werden. Damit kann die voraussichtliche Dauer des Trocknungsvorgangs bestimmt und einer Bedienperson angezeigt werden.From the DE 102006053274 A1 It is known to measure the absolute humidity in the tumble dryer. From this, the loading amount, in particular as weight, and the residual moisture of the laundry can be determined. Thus, the estimated duration of the drying process can be determined and displayed to an operator.

Aus der EP 1916326 A1 ist es bekannt, in einem Wäschetrockner die Beladungsmenge oder die Art der Textilien zu ermitteln. Dazu wird auf ein Antwortsignal eines Sensors abgestellt, welches sich verändert. Vorteilhaft wird auf die Feuchtigkeit abgestellt bzw. deren zeitlichen Verlauf während des Trocknungsvorgangs. Als zentraler Erfindungsgedanke ist dabei vorgesehen, dass ein Additiv in einen Behandlungsraum für die Wäsche zugegeben wird, insbesondere Feuchtigkeit. Dann wird der Verlauf der gemessenen Feuchtigkeit ausgewertet.From the EP 1916326 A1 It is known to determine the loading amount or the type of textiles in a tumble dryer. For this purpose, a response signal of a sensor is turned off, which changes. Advantageously, the moisture is turned off or its course over time during the drying process. As central idea of the invention is provided that an additive is added to a treatment room for the laundry, in particular moisture. Then the course of the measured moisture is evaluated.

Aus der US 2009/0313848 A1 ist es bekannt, ein Verfahren zur Trocknung von Wäsche in einem Wäschetrockner zu steuern mittels Analysieren eines Feuchtigkeitswerts der Wäsche.From the US 2009/0313848 A1 It is known to control a method of drying laundry in a clothes dryer by analyzing a moisture value of the laundry.

Aus der DE 19629805 A1 ist es bekannt, einen elektrischen Widerstandswert von Wäsche im Trockner zu erfassen. Darauf basierend kann die Steuerung des Wäschetrockners erfolgen, beispielsweise hinsichtlich Dauer des Trocknungsverfahrens.From the DE 19629805 A1 It is known to detect an electrical resistance of laundry in the dryer. Based on the control of the clothes dryer can be done, for example, in terms of duration of the drying process.

Aufgabe und LösungTask and solution

Der Erfindung liegt die Aufgabe zugrunde, ein eingangs genanntes Verfahren zu schaffen, mit dem Probleme und Nachteile des Standes der Technik vermieden werden können und es insbesondere möglich ist, ein praxistaugliches Verfahren zu schaffen, mit dem beim Betrieb eines Wäschetrockners der hauptsächliche Faseranteil der zu trocknenden Wäsche erkannt werden kann zur Anpassung des Betriebs des Wäschetrockners, insbesondere hinsichtlich Temperaturverlauf bzw. maximaler Temperatur. So können empfindliche Fasern geschont werden.The invention has for its object to provide an aforementioned method, with the problems and disadvantages of the prior art can be avoided and it is particularly possible to provide a practical method, with the operation of a tumble dryer, the main fiber content of the to be dried Laundry can be detected to adjust the operation of the tumble dryer, especially in terms Temperature profile or maximum temperature. This way, sensitive fibers can be spared.

Gelöst wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1. Vorteilhafte sowie bevorzugte Ausgestaltungen der Erfindung sind Gegenstand der weiteren Ansprüche und werden im Folgenden näher erläutert. Der Wortlaut der Ansprüche wird durch ausdrückliche Bezugnahme zum Inhalt der Beschreibung gemacht.This object is achieved by a method having the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of the other claims and are explained in more detail below. The wording of the claims is incorporated herein by express reference.

Es ist für den Betrieb des Wäschetrockners vorgesehen, dass nach Beginn des Trocknungsvorgangs der feuchten Wäsche, was entweder gleich beginnen kann oder auch erst nach einigen Minuten einsetzen kann, die Feuchtigkeit der Luft im Wäschetrockner bzw. deren zeitlicher Verlauf erfasst wird bzw. gemessen wird. Dabei kann die absolute Feuchtigkeit bzw. Luftfeuchtigkeit gemessen werden, wobei hierfür ein entsprechend geeigneter Feuchtesensor für eine absolute Feuchtemessung verwendet werden kann, wie er beispielsweise in der vorgenannten DE 102006053274 A1 offenbart ist. Alternativ kann auch die relative Feuchtigkeit in der Luft im Wäschetrockner gemessen werden mit einem entsprechenden Feuchtesensor. Derartige Feuchtesensoren für eine relative Feuchtemessung sind mittlerweile preisgünstig erhältlich und arbeiten ausreichend genau. Dann kann vorteilhaft zusätzlich die Temperatur der Luft in dem Wäschetrockner erfasst werden im zeitlichen Verlauf, um so wiederum auf die Werte für die benötigte Feuchtigkeit schließen zu können.It is provided for the operation of the tumble dryer, that after the beginning of the drying process of the wet laundry, which can either begin immediately or even after a few minutes, the humidity of the air in the tumble dryer or the time course is detected or measured. In this case, the absolute humidity or humidity can be measured, for which purpose a correspondingly suitable humidity sensor can be used for an absolute humidity measurement, as described for example in US Pat aforementioned DE 102006053274 A1 is disclosed. Alternatively, the relative humidity in the air in the tumble dryer can be measured with a corresponding humidity sensor. Such humidity sensors for a relative humidity measurement are now available inexpensively and work sufficiently accurately. Then, in addition, the temperature of the air in the tumble dryer can advantageously be recorded in the course of time, in order in turn to be able to infer the values for the required moisture.

Vor allem wird im Anstiegsbereich des Verlaufs der Feuchtigkeit bzw. während einer Anfangsphase des Trocknungsvorgangs gemessen. Dies kann beispielsweise während der ersten maximal 10 Minuten bis 15 Minuten sein, eher aber maximal 5 Minuten. Vorteilhaft kann die Messung bzw. Erfassung auch erst nach 1 bis 3 Minuten beginnen, um ganz zu Beginn herrschende Ungenauigkeiten auszuschließen.Above all, it is measured in the rising region of the course of the moisture or during an initial phase of the drying process. This can be, for example, during the first maximum of 10 minutes to 15 minutes, but more than 5 minutes maximum. Advantageously, the measurement or detection can only begin after 1 to 3 minutes in order to rule out prevailing inaccuracies at the very beginning.

In einem nachfolgenden Schritt wird der Verlauf der gemessenen Feuchtigkeit mit abgespeicherten Verläufen über der Zeit für die Feuchtigkeit verglichen. Alternativ kann eine Steigung des Verlaufs der gemessenen Feuchtigkeit, also deren Steigungs-Werte, mit abgespeicherten Steigungs-Grenzwerten der Feuchtigkeit verglichen werden. Dies gilt unabhängig davon, ob die absolute oder die relative Feuchtigkeit gemessen wird. Dabei sind entsprechende Verläufe und/oder Steigungs-Grenzwerte abgespeichert, und zwar für Fasern aus der Gruppe Baumwolle, Wolle, Kunstfaser. Hauptsächlich ist eine solche Kunstfaser PE bzw. Polyamid. Abgespeichert sein können diese Verläufe oder Steigungs-Grenzwerte in einem Speicher einer Steuerung des Wäschetrockners. Für die gespeicherten zeitlichen Verläufe können entsprechende Verläufe abgespeichert sein, also sozusagen Kurven, die als Diagramm oder wirklich als lückenloser durchgängiger zeitlicher Verlauf abgespeichert sein können, beispielsweise für die ersten 10 Minuten bis 15 Minuten. Für die Steigungs-Grenzwerte können einfache Werte ohne zeitlichen Verlauf abgespeichert sein, beispielsweise als maximale Steigungs-Grenzwerte. Alternativ sind die Steigungs-Grenzwerte mit einer bestimmten Zeit abgespeichert, also der Zeit, bei der sie jeweils typischerweise überschritten oder unterschritten werden, abhängig von dem hauptsächlichen Faseranteil bzw. Stoffanteil in der zu trocknenden Wäsche. Diese Steigungs-Grenzwerte können beispielsweise zu einem Zeitpunkt zwischen 1 Minute bis 3 Minuten und 10 Minuten bis 15 Minuten liegen, vorteilhaft zwischen 3 Minuten und 10 Minuten. Dies ist eben auch noch der Beginn des Trocknungsvorgangs.In a subsequent step, the course of the measured moisture is compared with stored curves over time for the moisture. Alternatively, a slope of the course of the measured moisture, ie its slope values, can be compared with stored slope limit values of the moisture. This applies regardless of whether the absolute or the relative humidity is measured. In this case, corresponding gradients and / or slope limits are stored, namely for fibers from the group cotton, wool, synthetic fibers. Mainly such a synthetic fiber is PE or polyamide. These gradients or slope limits can be stored in a memory of a tumble dryer control. Corresponding courses can be stored for the stored time profiles, that is to say curves which can be stored as a diagram or really as a continuous continuous course over time, for example for the first 10 minutes to 15 minutes. For the slope limit values, simple values can be stored without a time course, for example as maximum gradient limit values. Alternatively, the slope limits are stored with a certain time, ie the time at which they are typically exceeded or exceeded, depending on the main fiber content or proportion of substance in the laundry to be dried. For example, these slope limits may be between 1 minute to 3 minutes and 10 minutes to 15 minutes, advantageously between 3 minutes and 10 minutes. This is just the beginning of the drying process.

Entweder kann bei einem Vergleich des erfassten Verlaufs der Feuchtigkeit im Wäschetrockner mit den drei abgespeicherten Verläufen die größte Ähnlichkeit erkannt werden, so dass dann der hauptsächliche Stoffanteil der zu trocknenden Wäsche derjenigen Faserart zugeordnet wird, deren Verlauf der erfasste zeitliche Verlauf der Feuchtigkeit am besten entspricht. Abweichungen können hier direkt oder aber auch sozusagen integriert erfasst werden, beispielsweise über die Größe von Flächen einer Differenz zwischen den beiden Verläufen. Dabei können sowohl absolute Werte, beispielsweise Maximalpunkte oder Wendepunkte des Verlaufs, als auch relative Werte wie prozentualer Abfall innerhalb einer bestimmten Zeit, berücksichtigt werden.Either the greatest similarity can be recognized in a comparison of the recorded course of the moisture in the tumble dryer with the three stored courses, so that then the main portion of the material to be dried is assigned to that type of fiber. the course of which best matches the recorded time course of the moisture. Deviations can be detected here directly or else as it were integrated, for example, via the size of areas of a difference between the two courses. Both absolute values, such as maximum points or inflection points of the course, as well as relative values such as percentage decrease within a certain time, can be taken into account.

Werden alternativ Steigungs-Werte zu bestimmten Zeitpunkten verglichen, insbesondere beim Anstieg, so ist dies in der Regel einfacher und evtl. sogar genauer. Wird ein abgespeicherter oberer Steigungs-Grenzwert überschritten, so wird für die zu trocknende Wäsche ein hauptsächlicher Stoffanteil mit Kunstfasern erkannt. Wird ein abgespeicherter unterer Steigungs-Grenzwert unterschritten, so wird ein hauptsächlicher Stoffanteil mit Wolle bzw. Wollfasern erkannt. Liegt der erfasste Steigungs-Grenzwert zwischen dem oberen und dem unteren Steigungs-Grenzwert, so wird ein hauptsächlicher Stoffanteil mit Baumwolle bzw. Baumwollfasern erkannt. Dies kann, wie gesagt, zu einem geschickten Zeitpunkt gemacht werden. Bei dieser Alternative ist, leicht erkennbar, eine Auswertung bzw. Erkennung einfacher. Es braucht lediglich zu einem bestimmten Zeitpunkt, beispielsweise nach 3 Minuten bis 10 Minuten, der Steigungs-Wert aus dem erfassten zeitlichen Verlauf der Feuchtigkeit ermittelt zu werden, was leicht ist. Dann wird dieser erfasste Steigungs-Wert mit den abgespeicherten Steigungs-Grenzwerten verglichen und eine Eingruppierung der zu trocknenden Wäsche in eine der drei Kategorien vorgenommen.Alternatively, if slope values are compared at certain times, in particular during the ascent, then this is usually simpler and possibly even more accurate. If a stored upper gradient limit value is exceeded, a major proportion of the material to be dried is recognized by synthetic fibers. If a stored lower slope limit value is exceeded, a major substance content is recognized with wool or wool fibers. If the detected slope limit is between the upper and lower slope limits, then a major proportion of cotton or cotton fiber is detected. This can, as I said, be made at a good time. In this alternative, easily recognizable, an evaluation or detection easier. It only needs to be determined at a certain time, for example, after 3 minutes to 10 minutes, the slope value from the detected time course of the moisture, which is easy. Then, this detected slope value is compared with the stored slope limit values and a classification of the laundry to be dried into one of the three categories is made.

Abhängig davon kann dann der Betrieb des Wäschetrockners bzw. der Trocknungsvorgang angepasst werden. Dies gilt beispielsweise für den Temperaturverlauf bzw. eine maximale Temperatur, was insbesondere für die genannten Kunstfasern von großer Bedeutung ist. Diese dürfen nicht zu heiß getrocknet werden, da sie ansonsten relativ schnell brüchig werden. Ähnliches gilt auch für Wolle, wobei hier noch dazu kommt, dass die Drehzahl bzw. die Trommelbewegung des Wäschetrockners eher langsam bzw. schonend sein sollte, da Wolle ja relativ empfindlich ist. Für Baumwolle ist dies insgesamt weniger bedeutsam, da diese relativ leicht mit hohen Temperaturen sowie starker Trommelbewegung getrocknet werden kann.Depending on this, then the operation of the tumble dryer or the drying process can be adjusted. This applies, for example, to the temperature profile or a maximum temperature, which is of great importance in particular for the mentioned synthetic fibers. These must not be dried too hot, otherwise they will become brittle relatively quickly. The same applies to wool, whereby here comes to the fact that the speed or the drum movement of the tumble dryer should be rather slow or gentle, since wool is relatively sensitive. Overall, this is less important for cotton, as it can be dried relatively easily with high temperatures and strong drum movement.

Die Steigungs-Grenzwerte können nicht nur als einzelne Werte zu genau einem Zeitpunkt, sondern auch als Diagramm bzw. als zeitlicher Verlauf abgespeichert sein. Dann kann auch mehrfach, also zu mehreren Zeitpunkten, versucht werden, diese Steigungs-Werte zu erfassen und mit den abgespeicherten Steigungs-Grenzwerten zu vergleichen bei vorgegebenen Zeiten.The slope limit values can not only be stored as individual values at exactly one point in time, but also as a diagram or as a time course. Then several times, that is to say at several points in time, it may then be attempted to detect these slope values and to compare them with the stored slope limit values at given times.

Zusätzlich zu einer Erfassung der Feuchtigkeit im Wäschetrockner, insbesondere der absoluten Feuchtigkeit, kann noch die Temperatur im Wäschetrockner erfasst werden in ihrem zeitlichen Verlauf. Eine Erfassung der absoluten Feuchtigkeit ermöglicht es, zumindest wenn zu Beginn des Trocknungsvorgangs die Temperatur im Wäschetrockner im zeitlichen Verlauf erfasst wird, daraus dann die relative Feuchtigkeit zu bestimmen. Dabei können ein Temperatursensor und ein Feuchtesensor voneinander getrennt ausgebildet sein, um jeweils genaue und gleichzeitig kostengünstige Sensoren verwenden zu können.In addition to detecting the moisture in the tumble dryer, in particular the absolute humidity, the temperature in the tumble dryer can be recorded in their time course. A detection of the absolute humidity makes it possible, at least if at the beginning of the drying process, the temperature is detected in the tumble dryer over time, then to determine the relative humidity. In this case, a temperature sensor and a humidity sensor can be formed separately from each other to use each accurate and cost-effective sensors can.

Alternativ kann eben direkt die relative Feuchtigkeit im Wäschetrockner gemessen werden mit einem entsprechenden Feuchtesensor, der für relative Feuchtemessung ausgebildet ist. Auch dabei ist es möglich, zusätzlich mittels eines Temperatursensors die Temperatur der Luft in dem Wäschetrockner zu erfassen im zeitlichen Verlauf, um weitere Informationen zu gewinnen. Insbesondere kann daraus dann auch die absolute Feuchtigkeit berechnet werden. Auch hier sollte zumindest zu Beginn des Trocknungsvorgangs zusätzlich zur Feuchte die Temperatur der Luft im Wäschetrockner erfasst werden.Alternatively, the relative humidity in the tumble dryer can be measured directly with a corresponding humidity sensor, which is designed for relative humidity measurement. Also, it is possible to additionally detect by means of a temperature sensor, the temperature of the air in the dryer in the time course to gain more information. In particular, it can then be calculated from the absolute humidity. Here too, at least at the beginning of the drying process, the temperature of the air in the tumble dryer should be recorded in addition to the moisture.

Ist aufgrund des Vergleichs der erfassten zeitlichen Verläufe bzw. der erfassten Steigungs-Werte das hauptsächliche Fasermaterial der zu trocknenden Wäsche erkannt, so wird eben der Betrieb des Wäschetrockners daran angepasst. Dies gilt für Temperaturverlauf, maximale Temperatur, Trommelbewegung, Drehzahl und/oder Dauer des Trocknungsvorgangs. So können einerseits Beschädigungen der Fasern bzw. der zu trocknenden Wäsche vermieden werden. Andererseits kann der Trocknungsvorgang im möglichen Rahmen schnell und/oder energieeffizient durchgeführt werden.If the main fiber material of the laundry to be dried is recognized on the basis of the comparison of the recorded time profiles or the recorded gradient values, then the operation of the laundry dryer is precisely adapted to it. This applies to temperature profile, maximum temperature, drum movement, speed and / or duration of the drying process. So on the one hand damage to the fibers or the laundry to be dried can be avoided. On the other hand, the drying process can be carried out as quickly and / or energy-efficiently as possible.

Kurzbeschreibung der ZeichnungenBrief description of the drawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen schematisch dargestellt und werden im Folgenden näher erläutert. In den Zeichnungen zeigen:

Fig. 1
eine Innenansicht eines Wäschetrockners und
Fig. 2
ein Diagramm für verschiedene Verläufe der Feuchtigkeit über der Zeit bei Beladung mit Wäsche aus verschiedenen Fasern für den Wäschetrockner gemäß Fig. 1.
Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the drawings show:
Fig. 1
an inside view of a tumble dryer and
Fig. 2
a diagram for different courses of moisture over time when loaded with laundry of different fibers for the dryer according to Fig. 1 ,

Detaillierte Beschreibung der AusführungsbeispieleDetailed description of the embodiments

In Fig. 1 ist ein Wäschetrockner 11 für das erfindungsgemäße Verfahren dargestellt. Die Darstellung beschränkt sich auf die funktional wesentlichen Teile und soll lediglich veranschaulichen, wie diese wesentlichen Teile funktionieren. In einem Laderaum 12 befindet sich Wäsche 14 mit einer Restfeuchte nach dem Waschen bzw. Schleudern. Dieser Laderaum 12 wird üblicherweise gedreht bzw. rotiert, was für die Erfindung jedoch keine bedeutende Rolle spielt. Über einen Lufteinlass 16 wird Luft in den Laderaum 12 eingebracht. Der Luftstrom wird durch den Lüfter 17 erzeugt, wobei durch die nachgeschaltete Heizung 18 Luft erwärmt wird zur Trocknung der Wäsche 14. In ähnlicher Weise führt ein Luftauslass 20 aus dem Laderaum 12 heraus nach außen, was den Wäschetrockner 11 als Abluft-Wäschetrockner kennzeichnet. Die warme Luft wird also, wie von derartigen Wäschetrocknern bekannt, der Wäsche 14 zugeführt, nimmt Feuchtigkeit auf und transportiert diese über den Luftauslass 20 nach außen, um so die Wäsche zu trocknen.In Fig. 1 a clothes dryer 11 is shown for the method according to the invention. The presentation is limited to the functionally essential parts and is only intended to illustrate how these essential parts work. In a load compartment 12 is laundry 14 with a residual moisture after washing or spinning. This cargo space 12 is usually rotated or rotated, but this does not play a significant role for the invention. Air is introduced into the loading space 12 via an air inlet 16. The air flow is generated by the fan 17, 18 air is heated by the downstream heater for drying the laundry 14. Similarly, an air outlet 20 leads out of the loading space 12 to the outside, which identifies the tumble dryer 11 as an exhaust air dryer. The warm air is thus, as known from such dryers, supplied to the laundry 14, absorbs moisture and transports them through the air outlet 20 to the outside, so as to dry the laundry.

Zur Erfassung der Feuchtigkeit der Abluft ist in dem Luftauslass 20 ein Feuchtesensor 22 angeordnet. Ein solcher Feuchtesensor 22 ist dem Fachmann bekannt und braucht hier nicht näher erläutert zu werden. Der Feuchtesensor 22 ist mit einer Steuerung 24 verbunden, ebenso wie der Lüfter 17 und die Heizung 18. Die Steuerung 24 weist einen Speicher 25 auf, evtl. auch darin integriert, in dem verschiedene Werte oder Verläufe abgespeichert sein können, worauf nachfolgend noch näher eingegangen wird.For detecting the humidity of the exhaust air, a humidity sensor 22 is arranged in the air outlet 20. Such a humidity sensor 22 is known to the person skilled in the art and need not be explained in detail here. The humidity sensor 22 is connected to a controller 24, as well as the fan 17 and the heater 18. The controller 24 has a memory 25, possibly also integrated therein, in which various values or gradients can be stored, which will be discussed in more detail below becomes.

Neben dem Feuchtesensor 22 ist in dem Luftauslass 20 ein Temperatursensor 23 angeordnet, der ebenfalls mit der Steuerung 24 verbunden ist. Es ist vorteilhaft ein üblicher Temperatursensor, besonders vorteilhaft mit Widerstandsmessung. Der Feuchtesensor 22 kann vorteilhaft dazu ausgebildet sein, die absolute Feuchtigkeit zu messen, also diejenige der Abluft in dem Luftauslass 20. Alternativ kann es auch ein Feuchtesensor für eine relative Feuchtemessung sein, welcher möglicherweise kostengünstiger ist. Um dann auf die absolute Feuchtigkeit der Luft im Luftauslass 20 zu kommen, ist der Temperatursensor 23 im Luftauslass 20 vorgesehen. Hier ist er kurz vor dem Feuchtesensor 22 angeordnet, kann aber auch diesem gegenüberliegend oder kurz dahinter angeordnet sein. Ein solcher Wäschetrockner ist im Wesentlichen aus der eingangs genannten DE 102006053274 A1 bekannt, auf die diesbezüglich explizit verwiesen wird.In addition to the humidity sensor 22, a temperature sensor 23 is arranged in the air outlet 20, which is also connected to the controller 24. It is advantageous a conventional temperature sensor, particularly advantageous with resistance measurement. The moisture sensor 22 may advantageously be designed to measure the absolute humidity, that is, the exhaust air in the air outlet 20. Alternatively, it may also be a humidity sensor for a relative humidity measurement, which may be less expensive. In order then to come to the absolute humidity of the air in the air outlet 20, the temperature sensor 23 is provided in the air outlet 20. Here it is located just before the humidity sensor 22, but can also be arranged opposite or shortly behind it. Such a tumble dryer is in Essentially from the aforementioned DE 102006053274 A1 to which reference is explicitly made in this regard.

Außer für einen in Fig. 1 dargestellten Abluft-Wäschetrockner 11 kann die Erfindung auch für einen Kondensations-Wäschetrockner angewendet werden in modifizierter Form. Dazu ist ein entsprechender Feuchtesensor in einen Luftauslass von dem Laderaum vorgesehen vor einer nachgeschalteten Kondensationseinrichtung. So kann auch dort die Feuchtigkeit in der Abluft erfasst werden.Except for one in Fig. 1 shown exhaust air dryer 11, the invention can also be applied to a condensation dryer in a modified form. For this purpose, a corresponding moisture sensor is provided in an air outlet of the cargo space in front of a downstream condensation device. Thus, the moisture in the exhaust air can be detected there as well.

Zur allgemeinen Funktionsweise eines Wäschetrockners braucht hier nichts ausgeführt zu werden. Gemäß der Erfindung wird nach dem Einbringen der Wäsche 14 in den Wäschetrockner 11 bzw. dessen Laderaum 12 der Trocknungsvorgang gestartet mit Betrieb des Lüfters 17 und der Heizung 18 zum Erwärmen der Luft. Im Luftauslass 20 wird dabei mittels des Feuchtesensors 22 in diesem Ausführungsbeispiel die absolute Feuchtigkeit erfasst im zeitlichen Verlauf. Deren Kurven sind zum einen aus der vorgenannten DE 102006053274 A1 bekannt und in der Fig. 2 noch einmal dargestellt. Hier sind vier verschiedene Verläufe dargestellt, und zwar ein durchgezogener dünner Verlauf CO1 für eine Menge von 1,2 kg Wäsche ausschließlich aus Baumwollfasern mit 40% Restfeuchtigkeit. Der durchgezogene dicke Verlauf CO2 zeigt eine Menge von 4,5 kg Wäsche aus Baumwollfasern mit einer Feuchtigkeit von 50%. Der gestrichelte dünne Verlauf PE zeigt eine Menge von 1,2 kg Wäsche aus Polyesterfasern und einer Feuchte von 40%. Der dünne strichpunktierte Verlauf WO zeigt eine Menge von 1,2 kg Wäsche aus Wolle mit einer Feuchtigkeit von 40%. Der eingangs genannte Anstiegsbereich bzw. der Beginn des Trocknungsvorgangs wird hier in den ersten Minuten betrachtet, und zwar maximal für die ersten 15 Minuten gemessen, vorteilhaft für die ersten 3 Minuten bis 10 Minuten. Dabei ist in diesem Anstiegsbereich zu erkennen, dass der Verlauf jeweils zwar ähnlich ist, aber abhängig von der Art der Fasern der Wäsche unterschiedliche Steigung aufweist, wodurch sich natürlich auch unterschiedliche Verläufe ergeben. Die höchste Steigung am Anfang weist der Verlauf PE für die Kunstfaser auf, also Polyester. Die niedrigste Steigung weist erwartungsgemäß WO für Wolle auf. Dazwischen liegen die beiden Verläufe C01 und CO2 für Baumwolle, wobei erwartungsgemäß der Verlauf für die größere Menge an feuchterer Baumwolle als Verlauf CO2 steiler ist und höher ansteigt als für die geringere Menge an Baumwolle als Verlauf C01.For the general operation of a tumble dryer nothing needs to be done here. According to the invention, after the introduction of the laundry 14 into the tumble dryer 11 or its loading space 12, the drying process is started with the operation of the fan 17 and the heater 18 for heating the air. In the air outlet 20, the absolute humidity is detected over time by means of the humidity sensor 22 in this embodiment. Their curves are on the one hand from the aforementioned DE 102006053274 A1 known and in the Fig. 2 shown again. Here are four different courses shown, namely a solid thin course CO1 for a quantity of 1.2 kg of linen exclusively from cotton fibers with 40% residual moisture. The solid, thick course of CO2 shows a quantity of 4.5 kg of linen made of cotton fibers with a moisture content of 50%. The dashed thin pattern PE shows an amount of 1.2 kg of laundry from polyester fibers and a humidity of 40%. The thin dot-dash line WO shows an amount of 1.2 kg of wool laundry with a humidity of 40%. The above-mentioned rise range or the beginning of the drying process is considered here in the first minutes, measured for a maximum of the first 15 minutes, advantageously for the first 3 minutes to 10 minutes. It can be seen in this rise range that the course is indeed similar, but depending on the type of fibers of the laundry has different pitch, which of course results in different courses. The highest gradient at the beginning of the PE course for the synthetic fiber, so polyester. The lowest slope is expected to WO for wool. In between are the two courses C01 and CO2 for cotton, whereby, as expected, the course for the larger amount of moist cotton than course CO2 is steeper and rises higher than for the smaller amount of cotton than course C01.

Beispielhaft ist eingezeichnet, wie die Steigungs-Werte der Verläufe nach 3 Minuten sind. Der Verlauf PE weist zu diesem Zeitpunkt die größte Steigung auf mit dem Steigungs-Wert SPE, der Verlauf WO die geringste Steigung mit dem Steigungs-Wert SWO. Die Steigungs-Werte sind hier dargestellt durch die entsprechenden Geraden. Dazwischen liegen eben die beiden Steigungs-Werte für die Verläufe C01 und CO2 mit dem Steigungs-Wert SCO1 und mit dem Steigungs-Wert SCO2. Werden nun diese Steigungs-Werte, die vom Feuchtesensor 22 erfasst worden sind, zum Zeitpunkt 3 Minuten mit Steigungs-Grenzwerten verglichen, die im Speicher 25 abgespeichert sind, so kann folgendermaßen eine leichte Unterscheidung getroffen werden. Ein abgespeicherter oberer Steigungs-Grenzwert SGO, der punktiert dargestellt ist, liegt zwischen den Steigungs-Werten der Verläufe PE und CO2. Ein abgespeicherter unterer Steigungs-Grenzwert SGU, der auch punktiert dargestellt ist, kann zwischen den Steigungs-Werten der Verläufe C01 und WO liegen. Je nachdem, ob also zu diesem Zeitpunkt von t = 3 Minuten der obere Steigungs-Grenzwert SGO überschritten oder unterschritten wird und der untere Steigungs-Grenzwert SGU überschritten oder unterschritten wird, kann eine Einteilung in die Fasergruppen PE, CO oder WO, also Kunstfasern, Baumwolle oder Wolle, vorgenommen werden. Ob der vorliegende Steigungs-Wert tatsächlich exakt erfasst wird spielt eine untergeordnete Rolle, solange die Messung exakt genug ist, um das Überschreiten oder Unterschreiten eines der Steigungs-Grenzwerte sicher und zuverlässig sowie genau festzustellen. Auch wenn die Unterschiede in den Steigungs-Werten in der Fig. 2 nicht besonders deutlich aussehen, so sind sie es rechnerisch schon. So ist der Steigungs-Wert SPE um etwa 25% größer als der Steigungs-Grenzwert SGO, obwohl es gar nicht so aussieht.By way of example, it is shown how the gradient values of the curves are after 3 minutes. The course PE has at this time the largest slope with the slope value S PE , the course WO the lowest slope with the slope value S WO . The slope values are here represented by the corresponding straight lines. In between are just the two slope values for the curves C01 and CO2 with the slope value S CO1 and with the slope value S CO2 . Now, if these slope values detected by the humidity sensor 22 are compared with slope limit values stored in the memory 25 at the time of 3 minutes, an easy discrimination can be made as follows. A stored upper gradient limit S GO , which is shown in dotted lines, lies between the gradient values of the profiles PE and CO2. A stored lower slope limit S GU , which is also shown dotted, may be between the slope values of the curves C01 and WO. Depending on whether at this time of t = 3 minutes, the upper slope threshold S GO is exceeded or fallen below and the lower slope limit S GU is exceeded or not reached, a division into the fiber groups PE, CO or WO, ie Synthetic fibers, cotton or wool, are made. Whether the actual slope value is actually recorded exactly plays a minor role, as long as the measurement is accurate enough to reliably, reliably and accurately determine whether or not one of the gradient limit values is exceeded or undershot. Even though the differences in the slope values in the Fig. 2 do not look very clear, so they are already calculated. Thus, the slope value S PE is about 25% greater than the slope limit S GO , although it does not look like it.

Eine Messung relativ früh nach Beginn des Trocknungsvorgangs bzw. in dessen Anfangsphase, also beispielsweise nach den genannten 3 Minuten, weist nicht nur den Vorteil auf, dass dann sehr frühzeitig ein Erkennen des ausschließlichen oder hauptsächlichen Stoffanteils möglich ist, um beispielsweise bei empfindlichen Fasern wie Kunstfasern oder Wolle eine maximale Temperatur eher niedrig zu wählen und evtl. auch eine Drehzahl niedrig zu wählen, so dass Beschädigungen vermieden werden können. Des Weiteren sind hier eben die Anstiege noch besonders unterschiedlich, so dass sogar eine besonders gute Erkennung bzw. Unterscheidung der jeweiligen Steigungswerte möglich ist. Zum Zeitpunkt t = 10 Minuten wäre eine Unterscheidung schon nicht mehr so gut oder eigentlich überhaupt nicht mehr möglich.A measurement relatively early after the start of the drying process or in its initial phase, for example after the said 3 minutes, not only has the advantage that it then very early detection of the exclusive or main substance content is possible, for example, in sensitive fibers such as synthetic fibers or wool to choose a maximum temperature rather low and possibly also to choose a speed low, so that damage can be avoided. Furthermore, here are just the increases still very different, so that even a particularly good detection or differentiation of the respective slope values is possible. At the time t = 10 minutes, a distinction would not be so good or actually no longer possible.

Alternativ zu der vorbeschriebenen Erfassung von Steigungswerten zu einem frühen Zeitpunkt ist es auch möglich, dass in dem Speicher 25 der Steuerung 24 konkrete Verläufe abgespeichert sind. Diese unterscheiden sich in charakteristischer Art, so beispielsweise bei Wolle der sehr langsame Abfall der Feuchte nach Erreichen des Maximalwerts, da Wolle ihre Feuchtigkeit nur schwer abgibt. Demgegenüber ist die Kunstfaser sehr viel ausgeprägter im Maximalwert sowie in der Schnelligkeit des Abfalls, da Kunstfasern bekanntlich sehr viel schneller ihre Feuchtigkeit abgeben. Die Verläufe für Baumwolle liegen in etwa dazwischen.As an alternative to the above-described detection of slope values at an early point in time, it is also possible for 24 specific courses to be stored in the memory 25 of the controller 24. These differ in a characteristic manner, such as wool, the very slow drop in moisture after reaching the maximum value, as wool gives off their moisture difficult. In contrast, the synthetic fiber is much more pronounced in the maximum value and in the speed of the waste, since synthetic fibers are known to release their moisture much faster. The gradients for cotton are roughly in between.

Somit könnte auch diese grundsätzlichen Verläufe bzw. Verlaufsarten abgespeichert sein und durch Vergleich eines über die Zeit erfassten Verlaufs der Luftfeuchtigkeit im Luftauslass 20 mit einem abgespeicherten Verlauf ein Rückschluss auf den hauptsächlichen Stoffanteil in der Wäsche 14 gezogen werden. Dazu müsste aber erkennbar zumindest das Erreichen des Maximalwerts und ein anschließendes Abfallen abgewartet werden. Dies bedeutet aber zum Einen eine gewisse Wartezeit bis zur Erkennung. Zum Anderen kann dann bei einem Trocknen der Wäsche 14 mit sehr hoher Temperatur möglicherweise bereits eine Beschädigung der empfindlicheren Kunstfasern oder Wolle vorkommen. Insofern wird das Vergleichen der Steigungswerte als die vorteilhafteste Möglichkeit angesehen, weil sie auch sehr schnell ist.Thus, these basic courses or course types could also be stored and, by comparing a course of the humidity recorded in the air outlet 20 over time with a stored course, a conclusion can be drawn on the main substance portion in the laundry 14. For this purpose, however, at least the achievement of the maximum value and a subsequent drop would have to wait to be expected. On the one hand, this means a certain waiting time until detection. On the other hand, if the laundry 14 is dried at a very high temperature, damage to the more sensitive synthetic fibers or wool may possibly already occur. In this respect, comparing the slope values is considered the most advantageous option because it is also very fast.

Claims (11)

  1. Method for operating a tumble dryer (11) for drying damp laundry (14), comprising the following steps:
    - after a start of a drying process for said damp laundry (14) in said tumble dryer (11), a profile of moisture (CO1, CO2, PE, WO) of air in said tumble dryer is measured, wherein measurement is performed in an ascent region of said profile of said moisture and/or during an initial phase of said drying process,
    - in a following step, said profile of said measured moisture is compared with stored profiles for moisture and/or a gradient of said profile of said measured moisture is compared with stored gradient threshold values (SGU, SGO) for moisture,
    wherein profiles and/or gradient threshold values (SGU, SGO) are stored for fibres from the following group: cotton, wool and synthetic fibres,
    wherein an upper gradient threshold value (SGO) and a lower gradient threshold value (SGU) are stored,
    - wherein a major fabric content comprising synthetic fibres (PE) is identified when said upper gradient threshold value (SGO) for said laundry (14) is exceeded, a major fabric content comprising wool (WO) is identified when said lower gradient threshold value (SGU) is undershot, and a major fabric content comprising cotton (CO1, CO2) is identified between said upper gradient threshold value (SGO) and said lower gradient threshold value (SGU),
    - an operation of said tumble dryer (11) is matched to a material of said identified fibres in respect of temperature profile, maximum temperature, drum movement, rotation speed and/or duration of said drying process.
  2. Method according to claim 1, characterized in that the gradient threshold values (SGU, SGO) are stored in form of a graph and/or as a time profile.
  3. Method according to claim 1, characterized in that the gradient threshold values (SGU, SGO) are stored as purely numerical values.
  4. Method according to claim 3, characterized in that the gradient threshold values (SGU, SGO) are stored as purely numerical values at a specific point in time.
  5. Method according to any of the preceding claims, characterized in that an absolute moisture in said tumble dryer (11) is measured using a moisture sensor (22).
  6. Method according to any of the preceding claims, characterized in that a temperature of air in said tumble dryer (11) is detected over a course of time.
  7. Method according to claim 6, characterized in that the temperature of the air in the tumble dryer (11) is detected over a course of time at least at a beginning of said drying process.
  8. Method according to any of claims 1 to 4, characterized in that the relative moisture in said air in said tumble dryer (11) is measured using a corresponding moisture sensor (22) for relative moisture measurement.
  9. Method according to claim 8, characterized in that the temperature of the air in said tumble dryer (11) is additionally detected over a course of time.
  10. Method according to claim 8 or 9, characterized in that the temperature of the air in said tumble dryer (11) is additionally detected over a course of time at least at a beginning of said drying process.
  11. Method according to any of the preceding claims, characterized in that the operation of said tumble dryer (11) is matched to the material of said identified fibres with a lower maximum temperature for synthetic fibres (PE) and wool (WO) as the identified fibres.
EP16187187.6A 2015-09-15 2016-09-05 Method for operating a laundry dryer Active EP3144425B1 (en)

Priority Applications (1)

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PL16187187T PL3144425T3 (en) 2015-09-15 2016-09-05 Method for operating a laundry dryer

Applications Claiming Priority (1)

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DE102015217667.3A DE102015217667A1 (en) 2015-09-15 2015-09-15 Method for operating a tumble dryer

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EP3144425B1 true EP3144425B1 (en) 2019-07-17

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US (1) US10323351B2 (en)
EP (1) EP3144425B1 (en)
CN (1) CN106524695B (en)
DE (1) DE102015217667A1 (en)
ES (1) ES2748936T3 (en)
PL (1) PL3144425T3 (en)

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Publication number Publication date
EP3144425A1 (en) 2017-03-22
DE102015217667A1 (en) 2017-03-16
PL3144425T3 (en) 2020-01-31
CN106524695A (en) 2017-03-22
US20170073880A1 (en) 2017-03-16
CN106524695B (en) 2020-07-03
ES2748936T3 (en) 2020-03-18
US10323351B2 (en) 2019-06-18

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