EP1462563A1 - Clothes dryer and method for control of a clothes dryer - Google Patents

Clothes dryer and method for control of a clothes dryer Download PDF

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Publication number
EP1462563A1
EP1462563A1 EP04001913A EP04001913A EP1462563A1 EP 1462563 A1 EP1462563 A1 EP 1462563A1 EP 04001913 A EP04001913 A EP 04001913A EP 04001913 A EP04001913 A EP 04001913A EP 1462563 A1 EP1462563 A1 EP 1462563A1
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EP
European Patent Office
Prior art keywords
post
time
drying process
control arrangement
heating time
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Granted
Application number
EP04001913A
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German (de)
French (fr)
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EP1462563B1 (en
Inventor
Hansjörg Lampe
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Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
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    • 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
    • D06F58/46—Control of the operating time
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight

Definitions

  • the invention relates to a clothes dryer with a control arrangement for Control of the drying process and a measuring arrangement for determining the Degree of dryness of the laundry during a main drying process.
  • the invention also relates to a corresponding method for controlling a clothes dryer.
  • Such a tumble dryer is e.g. known from DE 3642459 A1.
  • This Known tumble dryer has a measuring arrangement by means of which the degree of dryness of the laundry to be dried can be determined. This determination is common carried out in several stages (humidity levels).
  • the degree of dryness is measured in the from DE3642459A1
  • Known tumble dryers the degree of dryness by measuring the conductivity of the laundry in the drum. But there are also others Methods such as the measurement of the drum outlet temperature is known.
  • the degree of dryness of the laundry can only be up to one Residual moisture of approx. 2% can be determined.
  • This object is achieved for the clothes dryer according to the invention in that the control arrangement the post-heating time of the post-drying process depending on the controls the course of the main drying process over time.
  • the reheating time is therefore not fixed. but can depend on the time course of the main drying process variably controlled. This enables the reheating time to be individually adapted to the the type and amount of laundry in the drum is possible.
  • the time course of the main drying process is measured by means of the measuring arrangement and by the control arrangement when determining the respective reheating time considered. Measuring the degree of dryness of the laundry can both done continuously as well as gradually.
  • control arrangement controls Control arrangement the post-heating time depending on the drying time between at least two predeterminable moisture levels. These are preferably the two during of the drying process last recorded moisture levels, e.g. the moisture level 2% Residual moisture and the moisture level 10% residual moisture.
  • Post-heating time of the control arrangement from the drying time between at least calculated two moisture levels.
  • This calculation is preferably based on a standardized reheating time for the individual drying programs, e.g. "Extra dry” and "iron damp".
  • the standardized post-heating time is the post-heating time, which at a standard load to the desired degree of dryness of the respective Drying program leads.
  • such a standard load also has one standardized drying time between the individual moisture levels.
  • the control arrangement now checks whether there is any during the respective drying process Deviation from the normalized drying time occurs and calculated if this is the Case is a correction factor. This correction factor then turns one into appropriate corrected reheating time calculated for each load.
  • the Control arrangement on a memory in which in the form of a table of at least two Drying times between two moisture levels each have a post-heating time saved is.
  • the control arrangement takes the respective reheating time from the saved table.
  • the object of the invention is achieved for the method in that the Control arrangement the post-heating time of the post-drying process depending on the controls the course of the main drying process over time.
  • Fig. 1 shows schematically an electric clothes dryer 1, which after Drum principle works.
  • the clothes dryer 1 has a housing 2 in which a provided for receiving the laundry rotatable drum 3 is arranged.
  • the Drying air is also not via a fan, not shown, with the help of a
  • the heating device shown is heated and introduced into the drum 3.
  • the Drying air heats and dries the laundry inside the drum 3 and is blown out of the drum 3 again.
  • Three are distributed on the inner circumference of the drum 3 Laundry driving ribs 6a, 6b and 6c arranged.
  • the three laundry taking ribs 6a, 6b and 6c serve to transport and circulate the laundry during the Drying process.
  • the laundry take-up ribs 6a and 6b are as Measuring electrodes are provided for a measuring arrangement 10 shown in more detail in FIG. 2.
  • the Clothes dryer 1 has controls 7 and a in the upper part Display device 8 on.
  • the measuring arrangement 10 shown in FIG. 2 is for electronic measurement of the Moisture or the degree of dryness of the laundry in the drum 3 intended.
  • the resistance of the laundry is measured by means of the measuring arrangement 10 measured during the drying process. Because damp laundry is less has electrical resistance than dry laundry can from the resistance measurement the degree of dryness of the laundry can be determined.
  • the laundry carrier ribs 6a and 6b are designed as measuring electrodes and electrically coupled to a resistance measuring circuit 11.
  • the resistance measuring circuit 11 measures the electrical resistance between the two laundry carrier ribs 6a and 6b, which is determined by the degree of dryness of the laundry located between the laundry carrier ribs 6a and 6b.
  • a control circuit 12 is provided as the control arrangement.
  • the resistance measurement circuit 11 is coupled to the control circuit 12 and delivers the measured resistance value to the control circuit 12 as the measurement signal 13.
  • the control circuit 12 evaluates the measurement signal 13 continuously or at predeterminable time intervals and supplies control signals 14 for sequence control of the further drying process to various other components of the clothes dryer 1, in particular to the blower (not shown) and the heating device (not shown).
  • the control circuit 12 also calculates the optimal reheating time for the respective drying process.
  • the degree of moisture or dryness of the laundry can only be determined up to a residual moisture of 2% by means of the measuring arrangement 10.
  • the drying process is then continued during the post-heating time calculated by the control circuit 12.
  • the control circuit 12 takes into account the time course of the main drying process.
  • the main drying process is the time during which the measuring arrangement 10 can determine the degree of moisture in the laundry.
  • the post-heating time can be calculated, for example, by the control circuit 12 determining the actual drying time between two predeterminable moisture levels. These are preferably the last two moisture levels, for example the moisture levels 2% residual moisture and 10% residual moisture.
  • the actual drying time is compared with a standard duration and a correction factor is calculated from it.
  • the standard duration is the period of time that a standard load for the drying program set in each case requires as the drying time between the two above moisture levels.
  • the standardized post-heating time provided for the respective drying program is then converted in such a way that a corrected post-heating time suitable for the respective load is obtained.
  • the normalized post-heating time is the post-heating time that provides the desired degree of dryness for the respective drying program when loading the standard. This calculation is explained below using an example:
  • a load of e.g. 2.5 kg an actual duration of 5 Minutes measured between the last two moisture levels.
  • the correction factor is 0.5 and accordingly the actual reheating time reduced to 10 minutes.
  • they are also non-linear Correction procedure possible.
  • control circuit 12 could also have a memory in which a Table is stored, the parameters of which are the duration between the last two Moisture levels and the duration of the reheating time are.
  • control circuit 12 each for the post-heating minimum and / or a maximum value that is independent of the calculated post-heating time must not be fallen short of or exceeded.
  • Maximum and minimum values can also be stored in a memory of the control circuit 12 are filed.

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

Abstract

The measurement circuit (10) has connections to two ribs (6a,6b) in the drum of the washing machine. The electronic circuit (11) measures the electrical resistance of these two ribs and produces an output measurement signal (13) which is fed to a control circuit (12). This produces a control output signal (14) which goes to the washing machine control system.

Description

Die Erfindung bezieht sich auf einen Wäschetrockner mit einer Steueranordnung zur Steuerung des Trockenvorgangs und einer Meßanordnung zum Ermitteln des Trockengrades der Wäsche während eines Haupttrockenvorgangs. Die Erfindung betrifft außerdem ein entsprechendes Verfahren zur Steuerung eines Wäschetrockners.The invention relates to a clothes dryer with a control arrangement for Control of the drying process and a measuring arrangement for determining the Degree of dryness of the laundry during a main drying process. The invention also relates to a corresponding method for controlling a clothes dryer.

Ein derartiger Wäschetrockner ist z.B. aus der DE 3642459 A1 bekannt. Dieser bekannte Wäschetrockner weist eine Meßanordnung auf, mittels derer der Trockengrad der zu trocknenden Wäsche ermittelt werden kann. Diese Ermittlung wird üblicherweise in mehreren Stufen (Feuchtestufen) durchgeführt. Bei dem aus der DE3642459A1 bekannten Wäschetrockner wird der Trockengrad mittels Messung der Leitfähigkeit der sich in der Trommel befindlichen Wäsche bestimmt. Es sind aber auch andere Verfahren, wie z.B. die Messung der Trommelaustrittstemperatur bekannt.Such a tumble dryer is e.g. known from DE 3642459 A1. This Known tumble dryer has a measuring arrangement by means of which the degree of dryness of the laundry to be dried can be determined. This determination is common carried out in several stages (humidity levels). In the from DE3642459A1 Known tumble dryers the degree of dryness by measuring the conductivity of the laundry in the drum. But there are also others Methods such as the measurement of the drum outlet temperature is known.

Mittels der bekannten Verfahren kann der Trockengrad der Wäsche nur bis zu einer Restfeuchte von ca. 2% ermittelt werden.By means of the known methods, the degree of dryness of the laundry can only be up to one Residual moisture of approx. 2% can be determined.

Wenn die Wäsche bis zu einem höheren Trockengrad getrocknet werden soll, erfolgt eine Nachheizung mit fester Nachheizzeit.If the laundry is to be dried to a higher degree of dryness, is done post-heating with a fixed post-heating time.

Dies hat jedoch den Nachteil, daß Beladungen von verschiedener Art und insbesondere von verschiedener Menge gleich lange nachgetrocknet werden, so daß am Ende des Nachtrockenvorganges unterschiedliche Beladungen verschieden stark getrocknet sind.However, this has the disadvantage that loads of different types and in particular of different amounts are dried for the same length of time, so that at the end of the After drying different loads are dried to different extents.

Es ist eine Aufgabe der Erfindung, einen Wäschetrockner der eingangs genannten Art aufzuzeigen, welcher einen verbesserten Nachtrockenvorgang aufweist. Eine weitere Aufgabe der Erfindung besteht darin, ein entsprechendes Verfahren zur Steuerung eines Wäschetrockners aufzuzeigen.It is an object of the invention to provide a clothes dryer of the type mentioned to show which has an improved post-drying process. Another The object of the invention is to provide a corresponding method for controlling a To show dryers.

Diese Aufgabe wird für den Wäschetrockner erfindungsgemäß dadurch gelöst, dass die Steueranordnung die Nachheizzeit des Nachtrockenvorgangs in Abhängigkeit des zeitlichen Verlaufs des Haupttrockenvorgangs steuert.This object is achieved for the clothes dryer according to the invention in that the control arrangement the post-heating time of the post-drying process depending on the controls the course of the main drying process over time.

Bei dem erfindungsgemäßen Wäschetrockner ist die Nachheizzeit somit nicht fest, sondern kann in Abhängigkeit des zeitlichen Verlaufs des Haupttrockenvorgangs variabel gesteuert. Dadurch ist eine individuelle Anpassung der Nachheizzzeit an die sich jeweils in der Trommel befindliche Wäscheart und Wäschemenge möglich. Der zeitliche Verlauf des Haupttrockenvorgangs wird mittels der Meßanordnung gemessen und von der Steueranordnung bei der Festlegung der jeweiligen Nachheizzeit berücksichtigt. Die Messung des Trockengrades der Wäsche kann sowohl kontinuierlich als auch stufenweise erfolgen.In the tumble dryer according to the invention, the reheating time is therefore not fixed. but can depend on the time course of the main drying process variably controlled. This enables the reheating time to be individually adapted to the the type and amount of laundry in the drum is possible. The The time course of the main drying process is measured by means of the measuring arrangement and by the control arrangement when determining the respective reheating time considered. Measuring the degree of dryness of the laundry can both done continuously as well as gradually.

Bei der vorteilhaften Ausgestaltung der Erfindung nach Anspruch 2 steuert die Steueranordnung die Nachheizzeit in Abhängigkeit der Trocknungsdauer zwischen wenigstens zwei vorgebbaren Feuchtestufen. Vorzugsweise sind dies die zwei während des Trockenprozesses zuletzt erfassten Feuchtestufen, z.B. die Feuchtestufe 2% Restfeuchte und die Feuchtestufe 10% Restfeuchte.In the advantageous embodiment of the invention according to claim 2 controls Control arrangement the post-heating time depending on the drying time between at least two predeterminable moisture levels. These are preferably the two during of the drying process last recorded moisture levels, e.g. the moisture level 2% Residual moisture and the moisture level 10% residual moisture.

Bei der vorteilhaften Ausgestaltung der Erfindung gemäß Anspruch 3 wird die Nachheizzeit von der Steueranordnung aus der Trocknungsdauer zwischen wenigstens zwei Feuchtestufen berechnet. Diese Berechnung geht vorzugsweise von einer normierten Nachheizzzeit für die einzelnen Trockenprogramme, z.B. "Schranktrocken" und "Bügelfeucht" aus. Die normierte Nachheizzeit ist die Nachheizzeit, welche bei einer Normbeladung zu dem gewünschten Trockengrad des jeweiligen Trockenprogramms führt. Gleichzeitig weist eine derartige Normbeladung auch eine normierte Trocknungsdauer zwischen den einzelnen Feuchtestufen auf. Die Steueranordnung überprüft nun, ob bei dem jeweiligen Trockenvorgang eine Abweichung von der normierten Trocknungsdauer auftritt und berechnet, falls dies der Fall ist, einen Korrekturfaktor. Mittels dieses Korrekturfaktors wird dann eine zu der jeweiligen Beladung passende korrigierte Nachheizzeit berechnet.In the advantageous embodiment of the invention according to claim 3 Post-heating time of the control arrangement from the drying time between at least calculated two moisture levels. This calculation is preferably based on a standardized reheating time for the individual drying programs, e.g. "Extra dry" and "iron damp". The standardized post-heating time is the post-heating time, which at a standard load to the desired degree of dryness of the respective Drying program leads. At the same time, such a standard load also has one standardized drying time between the individual moisture levels. The The control arrangement now checks whether there is any during the respective drying process Deviation from the normalized drying time occurs and calculated if this is the Case is a correction factor. This correction factor then turns one into appropriate corrected reheating time calculated for each load.

Bei der vorteilhaften Ausgestaltung der Erfindung gemäß Anspruch 4 weist die Steueranordnung einen Speicher auf, in dem in Form einer Tabelle zu wenigstens zwei Trocknungsdauern zwischen zwei Feuchtestufen jeweils eine Nachheizzeit gespeichert ist. Bei dieser Ausgestaltung der Erfindung ist zur Bestimmung der individuellen Nachheizzzeit keine Berechnung erforderlich. Vielmehr entnimmt die Steueranordnung die jeweilige Nachheizzeit aus der gespeicherten Tabelle.In the advantageous embodiment of the invention according to claim 4, the Control arrangement on a memory in which in the form of a table of at least two Drying times between two moisture levels each have a post-heating time saved is. In this embodiment of the invention is to determine the individual Post-heating time no calculation required. Rather, the control arrangement takes the respective reheating time from the saved table.

Gemäß der vorteilhaften Ausgestaltung der Erfindung nach Anspruch 5 steuert die Steueranordnung die Nachheizzeit so, dass ein vorgebbarer Minimalwert nicht unterschritten wird und gemäß der vorteilhaften Ausgestaltung der Erfindung nach Anspruch 6 so, dass ein vorgebbarer Maximalwert nicht überschritten wird.According to the advantageous embodiment of the invention according to claim 5 controls Control arrangement the post-heating time so that a predeterminable minimum value does not is undershot and according to the advantageous embodiment of the invention Claim 6 so that a predetermined maximum value is not exceeded.

Dadurch wird eine erhöhte Sicherheit des Trockenvorgangs erzielt. Es wird gewährleistet, daß z.B. bei fehlerhaften Meßwerten der Meßanordnung trotzdem eine hinreichende Genauigkeit des eingestellten Trockengrades erreicht wird.This increases the safety of the drying process. It will ensures that e.g. in the case of incorrect measured values of the measuring arrangement, one nevertheless sufficient accuracy of the set degree of dryness is achieved.

Die Aufgabe der Erfindung wird für das Verfahren dadurch gelöst, dass die Steueranordnung die Nachheizzeit des Nachtrockenvorgangs in Abhängigkeit des zeitlichen Verlaufs des Haupttrockenvorgangs steuert.The object of the invention is achieved for the method in that the Control arrangement the post-heating time of the post-drying process depending on the controls the course of the main drying process over time.

Ein schematisch dargestelltes Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung in den Figuren 1 und 2 näher erläutert. Es zeigen:

Fig. 1
die Ansicht eines Wäschetrockners
Fig. 2
ein Blockschaltbild einer Meß- und Steueranordnung des Wäschetrockners
A schematically illustrated embodiment of the invention is explained below with reference to the drawing in Figures 1 and 2. Show it:
Fig. 1
the view of a clothes dryer
Fig. 2
a block diagram of a measuring and control arrangement of the clothes dryer

Fig 1 zeigt schematisch einen elektrischen Wäschetrockner 1, der nach dem Trommelprinzip arbeitet. Der Wäschetrockner 1 weist ein Gehäuse 2 auf, in dem eine zur Aufnahme der Wäsche vorgesehene drehbare Trommel 3 angeordnet ist. Die Trocknungsluft wird über ein nicht dargestelltes Gebläse mit Hilfe einer ebenfalls nicht dargestellten Heizvorrichtung erwärmt und in die Trommel 3 eingeleitet. Die Trocknungsluft erwärmt und trocknet innerhalb der Trommel 3 die Wäsche und wird wieder aus der Trommel 3 ausgeblasen. An der Vorderseite 4 des Gehäuses 2 befindet sich eine Beladungstür 5, welche zur Beladung geöffnet und zum Trocknen geschlossen werden kann. An dem inneren Umfang der Trommel 3 sind verteilt drei Wäschemitnahmerippen 6a, 6b und 6c angeordnet. Die drei Wäschemitnahmerippen 6a, 6b und 6c dienen zum Transport und zur Umwälzung der Wäsche während des Trockenvorgangs. Gleichzeitig sind die Wäschemitnahmerippen 6a und 6b als Meßelektroden für eine in Fig. 2 näher dargestellte Meßanordnung 10 vorgesehen. Der Wäschetrockner 1 weist im oberen Teil Bedienelemente 7 sowie eine Anzeigevorrichtung 8 auf.Fig. 1 shows schematically an electric clothes dryer 1, which after Drum principle works. The clothes dryer 1 has a housing 2 in which a provided for receiving the laundry rotatable drum 3 is arranged. The Drying air is also not via a fan, not shown, with the help of a The heating device shown is heated and introduced into the drum 3. The Drying air heats and dries the laundry inside the drum 3 and is blown out of the drum 3 again. Located on the front 4 of the housing 2 there is a loading door 5 which is opened for loading and closed for drying can be. Three are distributed on the inner circumference of the drum 3 Laundry driving ribs 6a, 6b and 6c arranged. The three laundry taking ribs 6a, 6b and 6c serve to transport and circulate the laundry during the Drying process. At the same time, the laundry take-up ribs 6a and 6b are as Measuring electrodes are provided for a measuring arrangement 10 shown in more detail in FIG. 2. The Clothes dryer 1 has controls 7 and a in the upper part Display device 8 on.

Die in Fig. 2 dargestellte Meßanordnung 10 ist zur elektronischen Messung der Feuchtigkeit bzw. des Trockengrades der sich in der Trommel 3 befindlichen Wäsche vorgesehen. Hierzu wird mittels der Meßanordnung 10 der Widerstand der Wäsche während des Trockenvorgangs gemessen. Da feuchte Wäsche einen geringeren elektrischen Widerstand als trockene Wäsche hat, kann aus der Widerstandsmessung der Trockengrad der Wäsche ermittelt werden.The measuring arrangement 10 shown in FIG. 2 is for electronic measurement of the Moisture or the degree of dryness of the laundry in the drum 3 intended. For this purpose, the resistance of the laundry is measured by means of the measuring arrangement 10 measured during the drying process. Because damp laundry is less has electrical resistance than dry laundry can from the resistance measurement the degree of dryness of the laundry can be determined.

In dem Ausführungsbeispiel sind die Wäschemitnahmerippen 6a und 6b als Meßelektroden ausgebildet und elektrisch mit einer Widerstandsmeßschaltung 11 gekoppelt. Die Widerstandsmeßschaltung 11 mißt den elektrischen Widerstand zwischen den beiden Wäschemitnahmerippen 6a und 6b, der durch den Trockengrad der sich zwischen den Wäschemitnahmerippen 6a und 6b befindlichen Wäsche bestimmt wird. Als Steueranordnung ist eine Steuerschaltung 12 vorgesehen. Die Widerstandsmeßschaltung 11 ist mit der Steuerschaltung 12 gekoppelt und liefert an die Steuerschaltung 12 als Meßsignal 13 den gemessenen Widerstandswert. Die Steuerschaltung 12 wertet das Meßsignal 13 kontinuierlich oder in vorgebbaren Zeitabständen aus und liefert Steuersignale 14 zur Ablaufsteuerung des weiteren Trockenvorgangs an verschiedene andere Komponenten des Wäschetrockners 1, insbesondere an das nicht dargestellte Gebläse und die nicht dargestellte Heizvorrichtung. Die Steuerschaltung 12 berechnet auch die für den jeweiligen Trockenvorgang optimale Nachheizzeit. Mittels der Meßanordnung 10 kann der Feuchte- bzw Trockengrad der Wäsche nur bis zu einer Restfeuchte von 2% bestimmt werden. Danach wird der Trockenvorgang noch während der von der Steuerschaltung 12 berechneten Nachheizzeit weiterbetrieben. Für die Berechnung der Nachheizzeit berücksichtigt die Steuerschaltung 12 den zeitlichen Verlauf des Haupttrockenvorgangs. Als Haupttrockenvorgang wird die Zeit bezeichnet, während derer die Meßanordnung 10 den Feuchtegrad der Wäsche bestimmen kann.
Die Berechnung der Nachheizzzeit kann z.B. dadurch erfolgen, daß die Steuerschaltung 12 die tatsächliche Trockendauer zwischen zwei vorgebbaren Feuchtestufen ermittelt. Dies sind vorzugsweise die beiden letzten Feuchtestufen, z.B. die Feuchtestufen 2% Restfeuchte und 10% Restfeuchte. Die tatsächliche Trockendauer wird mit einer Normdauer verglichen und daraus ein Korrekturfaktor berechnet. Die Normdauer ist diejenige Zeitdauer, welche eine Normbeladung bei dem jeweils eingestellten Trockenprogramm als Trockenzeit zwischen den beiden obigen Feuchtestufen benötigt. Mit diesem Korrekturfaktor wird dann die für das jeweilige Trockenprogramm vorgesehene normierte Nachheizzeit so umgerechnet, daß man eine zu der jeweiligen Beladung passende korrigierte Nachheizzeit erhält. Dabei ist die normierte Nachheizzeit die Nachheizzeit, welche bei der Normbeladung den für das jeweilige Trockenprogramm gewünschten Trockengrad liefert. Diese Berechnung wird nachfolgend anhand eines Beispiels erläutert:In the exemplary embodiment, the laundry carrier ribs 6a and 6b are designed as measuring electrodes and electrically coupled to a resistance measuring circuit 11. The resistance measuring circuit 11 measures the electrical resistance between the two laundry carrier ribs 6a and 6b, which is determined by the degree of dryness of the laundry located between the laundry carrier ribs 6a and 6b. A control circuit 12 is provided as the control arrangement. The resistance measurement circuit 11 is coupled to the control circuit 12 and delivers the measured resistance value to the control circuit 12 as the measurement signal 13. The control circuit 12 evaluates the measurement signal 13 continuously or at predeterminable time intervals and supplies control signals 14 for sequence control of the further drying process to various other components of the clothes dryer 1, in particular to the blower (not shown) and the heating device (not shown). The control circuit 12 also calculates the optimal reheating time for the respective drying process. The degree of moisture or dryness of the laundry can only be determined up to a residual moisture of 2% by means of the measuring arrangement 10. The drying process is then continued during the post-heating time calculated by the control circuit 12. For the calculation of the post-heating time, the control circuit 12 takes into account the time course of the main drying process. The main drying process is the time during which the measuring arrangement 10 can determine the degree of moisture in the laundry.
The post-heating time can be calculated, for example, by the control circuit 12 determining the actual drying time between two predeterminable moisture levels. These are preferably the last two moisture levels, for example the moisture levels 2% residual moisture and 10% residual moisture. The actual drying time is compared with a standard duration and a correction factor is calculated from it. The standard duration is the period of time that a standard load for the drying program set in each case requires as the drying time between the two above moisture levels. With this correction factor, the standardized post-heating time provided for the respective drying program is then converted in such a way that a corrected post-heating time suitable for the respective load is obtained. The normalized post-heating time is the post-heating time that provides the desired degree of dryness for the respective drying program when loading the standard. This calculation is explained below using an example:

Für ein Trockenprogramm "schranktrocken" haben die Meßanordnung 10 und die Steuerschaltung 12 für eine 5kg Beladung nach Norm eine Normdauer zwischen den beiden letzten Feuchtestufen von 10 min ermittelt. Als normierte Nachheizzeit für diese Normbeladung wurde ein Wert von 20 Minuten festgelegt.For a drying program "cabinet dry" have the measuring arrangement 10 and Control circuit 12 for a 5kg load according to norm a norm duration between the last two humidity levels of 10 min. As a standardized post-heating time for this The standard load was set at 20 minutes.

Im Betrieb wird nun für eine Beladung von z.B. 2.5 kg eine tatsächliche Dauer von 5 Minuten zwischen den beiden letzten Feuchtestufen gemessen. In diesem Fall würde bei einer linearen Korrektur der Korrekturfaktor 0.5 betragen und dementsprechend die tatsächliche Nachheizzeit auf 10 Minuten reduziert. Es sind jedoch auch nichtlineare Korrekturverfahren möglich.In operation, a load of e.g. 2.5 kg an actual duration of 5 Minutes measured between the last two moisture levels. In this case a linear correction, the correction factor is 0.5 and accordingly the actual reheating time reduced to 10 minutes. However, they are also non-linear Correction procedure possible.

Alternativ könnte die Steuerschaltung 12 auch einen Speicher aufweisen, in dem eine Tabelle abgelegt ist, deren Parameter die Dauer zwischen den beiden letzten Feuchtestufen und die Dauer der Nachheizzeit sind.Alternatively, the control circuit 12 could also have a memory in which a Table is stored, the parameters of which are the duration between the last two Moisture levels and the duration of the reheating time are.

Zusätzlich ist es vorteilhaft, daß die Steuerschaltung 12 für die Nachheizzeit je einen minimalen und/oder einen maximalen Wert berücksichtigt, der unabhängig von der berechneten Nachheizzeit nicht unter- bzw. überschritten werden darf. Derartige Maximal- und Minmalwerte können ebenfalls in einem Speicher der Steuerschaltung 12 abgelegt werden.In addition, it is advantageous that the control circuit 12 each for the post-heating minimum and / or a maximum value that is independent of the calculated post-heating time must not be fallen short of or exceeded. such Maximum and minimum values can also be stored in a memory of the control circuit 12 are filed.

Claims (7)

Wäschetrockner (1), aufweisend
eine Steueranordnung (12) zur Steuerung des Trockenvorgangs und
eine Meßanordnung (10) zum Ermitteln des Trockengrades der Wäsche während eines Haupttrockenvorgangs,
dadurch gekennzeichnet, dass
die Steueranordnung (12) die Nachheizzeit eines Nachtrockenvorgangs in Abhängigkeit des zeitlichen Verlaufs des Haupttrockenvorgangs steuert.Tumble dryer (1), having
a control arrangement (12) for controlling the drying process and
a measuring arrangement (10) for determining the degree of dryness of the laundry during a main drying process,
characterized in that
the control arrangement (12) controls the post-heating time of a post-drying process as a function of the time course of the main drying process. Wäschetrockner nach Anspruch 1, dadurch gekennzeichnet, dass die Steueranordnung (12) die Nachheizzeit in Abhängigkeit der Trocknungsdauer zwischen wenigstens zwei vorgebbaren Feuchtestufen steuert.Laundry dryer according to claim 1, characterized in that the control arrangement (12) controls the post-heating time depending on the drying time between at least two predeterminable moisture levels. Wäschetrockner nach Anspruch 2, dadurch gekennzeichnet, dass die Steueranordnung (12) die Nachheizzeit aus der Trocknungsdauer zwischen wenigstens zwei Feuchtestufen berechnet.Laundry dryer according to claim 2, characterized in that the control arrangement (12) calculates the post-heating time from the drying time between at least two moisture levels. Wäschetrockner nach Anspruch 2, dadurch gekennzeichnet, dass die Steueranordnung (12) einen Speicher aufweist, in dem in Form einer Tabelle zu wenigstens zwei Trocknungsdauem zwischen zwei Feuchtestufen jeweils eine Nachheizzeit gespeichert ist und dass die Steueranordnung (12) die Nachheizzeit mittels dieser gespeicherten Tabelle steuert.Clothes dryer according to claim 2, characterized in that the control arrangement (12) has a memory in which a post-heating time is stored in the form of a table for at least two drying times between two moisture levels and that the control arrangement (12) controls the post-heating time by means of this stored table , Wäschetrockner nach Anspruch 1, dadurch gekennzeichnet, dass die Steueranordnung (12) die Nachheizzeit so steuert, dass ein vorgebbarer Minimalwert nicht unterschritten wird. Laundry dryer according to claim 1, characterized in that the control arrangement (12) controls the post-heating time so that a predeterminable minimum value is not fallen below. Wäschetrockner nach Anspruch 1, dadurch gekennzeichnet, dass die Steueranordnung (12) die Nachheizzeit so steuert, dass ein vorgebbarer Maximalwert nicht überschritten wird.Clothes dryer according to claim 1, characterized in that the control arrangement (12) controls the post-heating time so that a predeterminable maximum value is not exceeded. Verfahren zur Steuerung des Trockenvorgangs eines Wäschetrockners (1) mittels einer Steueranordnung (12), wobei eine Meßanordnung (10) den Trockengrad der Wäsche während eines Haupttrockenvorgangs ermittelt,
dadurch gekennzeichnet, dass die Steueranordnung (12) die Nachheizzeit eines Nachtrockenvorgangs in Abhängigkeit des zeitlichen Verlaufs des Haupttrockenvorgangs steuert.Method for controlling the drying process of a laundry dryer (1) by means of a control arrangement (12), a measuring arrangement (10) determining the degree of drying of the laundry during a main drying process,
characterized in that the control arrangement (12) controls the post-heating time of a post-drying process depending on the time course of the main drying process.
EP04001913A 2003-03-27 2004-01-29 Clothes dryer with control unit for controlling the drying time Expired - Lifetime EP1462563B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10313763 2003-03-27
DE10313763A DE10313763A1 (en) 2003-03-27 2003-03-27 Tumble dryer and method for controlling a tumble dryer

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EP1462563A1 true EP1462563A1 (en) 2004-09-29
EP1462563B1 EP1462563B1 (en) 2011-11-30

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AT (1) ATE535642T1 (en)
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WO2017032221A1 (en) * 2015-08-26 2017-03-02 青岛海尔滚筒洗衣机有限公司 Washing machine and control method therefor

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US3762064A (en) * 1971-11-12 1973-10-02 Whirlpool Co Timer with cycle and time dependent runout for dryer
US3769716A (en) * 1971-11-12 1973-11-06 Whirlpool Co Variable timer runout control for dryer
GB2090435A (en) * 1980-12-30 1982-07-07 Carpano & Pons Control system for clothes drier
US4733479A (en) * 1985-10-25 1988-03-29 Hitachi, Ltd. Method of controlling an electric clothes dryer including automatic load detection
DE3703671A1 (en) * 1987-02-06 1988-08-18 Bosch Siemens Hausgeraete Method of determining the duration of an ongoing drying process in a laundry dryer
US20020184789A1 (en) * 2001-05-25 2002-12-12 Maytag Corporation Self programming clothes dryter system

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Publication number Priority date Publication date Assignee Title
US3762064A (en) * 1971-11-12 1973-10-02 Whirlpool Co Timer with cycle and time dependent runout for dryer
US3769716A (en) * 1971-11-12 1973-11-06 Whirlpool Co Variable timer runout control for dryer
GB2090435A (en) * 1980-12-30 1982-07-07 Carpano & Pons Control system for clothes drier
US4733479A (en) * 1985-10-25 1988-03-29 Hitachi, Ltd. Method of controlling an electric clothes dryer including automatic load detection
DE3703671A1 (en) * 1987-02-06 1988-08-18 Bosch Siemens Hausgeraete Method of determining the duration of an ongoing drying process in a laundry dryer
US20020184789A1 (en) * 2001-05-25 2002-12-12 Maytag Corporation Self programming clothes dryter system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017032221A1 (en) * 2015-08-26 2017-03-02 青岛海尔滚筒洗衣机有限公司 Washing machine and control method therefor

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Publication number Publication date
ES2376231T3 (en) 2012-03-12
ATE535642T1 (en) 2011-12-15
DE10313763A1 (en) 2004-10-07
EP1462563B1 (en) 2011-11-30

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