EP3527713B1 - Detection of laundry coilers in laundry driers - Google Patents

Detection of laundry coilers in laundry driers Download PDF

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Publication number
EP3527713B1
EP3527713B1 EP19155900.4A EP19155900A EP3527713B1 EP 3527713 B1 EP3527713 B1 EP 3527713B1 EP 19155900 A EP19155900 A EP 19155900A EP 3527713 B1 EP3527713 B1 EP 3527713B1
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EP
European Patent Office
Prior art keywords
laundry
frequency
drum
predefined
peak
Prior art date
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EP19155900.4A
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German (de)
French (fr)
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EP3527713A1 (en
Inventor
Kai-Uwe Bache
Maike Blanken
Klaus-Robert MÜLLER
Wiktor Pronobis
Ekkehard VON DER WAYDBRINK
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP3527713A1 publication Critical patent/EP3527713A1/en
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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
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • 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
    • 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

Definitions

  • the invention relates to a method for recognizing laundry winders in a laundry drying device with a horizontally rotatable laundry drum.
  • the invention also relates to a laundry drying device which is set up to carry out the method.
  • laundry winders also referred to as laundry knots
  • laundry knots When laundry is moved in a rotatable laundry drum of a laundry dryer, so-called “laundry winders” (also referred to as laundry knots) can occur, which negatively affect the drying result.
  • laundry winders Under laundry winders a rolling up of laundry items or a rolling of laundry items into other laundry items is understood, so that the entangled laundry items can no longer move freely in the laundry drum.
  • a laundry drum in which two specially shaped drivers are arranged opposite one another.
  • the carriers move the laundry in such a way that only a few wrappers are created or that the curlers can come loose because they fall onto the carriers at the right angle.
  • the drivers cannot reliably prevent laundry curlers from forming and remaining in place.
  • DE 10 2013 215 675 A1 discloses a method for operating a laundry drying device with a horizontally mounted, rotatable laundry drum, the method comprising at least the step of determining a degree of laundry knotting (curling) of laundry items located in the laundry drum.
  • the step of determining can include determining the degree of laundry knotting from an evaluation of regularly recurring peaks of an electrical motor signal, in particular a motor current signal, determined via a rotational position of the laundry drum.
  • Measuring electrodes belonging to the resistance measuring device are arranged in the end shield or in the drum.
  • the measuring electrodes can be two metal strips that are attached parallel to one another on a lower door opening edge in the bearing plate.
  • the electrical resistance of the laundry depends on the amount of water bound in the laundry: the drier the laundry, the higher its electrical resistance.
  • Two different methods are known for measuring resistance. In a first method of determining moisture content, a low DC voltage is applied to the measuring electrodes. The resulting measurement signal is passed through a voltage divider. The resistance value is determined from the measurement signal, averaged if necessary.
  • the moisture or the degree of dryness of the laundry are determined using a corresponding characteristic curve.
  • a square alternating voltage signal with a high frequency is applied to the measuring electrodes.
  • the resulting measurement signal can be routed via a bridge circuit, for example an H-bridge.
  • the measurement signal with the highest value and the measurement signal with the lowest value can be deleted from several (e.g. eight consecutive) measurement signals and then the measurement signal with the lowest value of the remaining values can be selected for further processing.
  • the selected measurement signals can be smoothed further using a Bessel filter.
  • the degree of dryness can be determined from the Bessel-filtered measurement signal (s), for example by means of a characteristic curve.
  • EP 2 593 601 B1 discloses a method for operating a tumble dryer device for drying laundry, in which an alternating voltage signal is applied to laundry, a moisture content of the laundry is determined by measuring a current flowing through the laundry, an envelope signal successively for determining the moisture content from the measured current Samples is generated.
  • EP 2 593 601 B1 also discloses that a clothes dryer apparatus can be adapted to operate to dry laundry by a method in which: an AC voltage signal is applied to laundry and a moisture content of the laundry is determined by measuring a current conducted through the laundry; and in order to determine the moisture content from the measured current value, an envelope curve signal of successive sampled values is generated.
  • the tumble dryer device comprises, for example, an alternating voltage generator that generates an alternating voltage, at least one electrode which is connected to outputs of the alternating voltage generator, wherein the at least one electrode can be covered by the laundry, and a control circuit which is used to determine a characteristic Size for a moisture content of the laundry from a measured alternating current between the electrodes is functionally connected to the at least one electrode.
  • WO 2016/085252 A1 discloses a clothes dryer, the control device of which includes an information receiving unit for receiving information on objects to be dried indicating a state of the objects to be dried within a drum.
  • the control device compares a heating output over time of a heater with an output during normal operation, and reduces the heating output of the heater based on the state of the objects to be dried based on the information, or controls a drying period based on the state of the objects to be dried and the heating power.
  • JP 2010051431 A discloses a method for determining entanglement of laundry.
  • a washing machine comprises a vibration detection unit for detecting a vibration of a receiving pan and a tangled state determination unit which detects a change in the vibration detected by the vibration detection unit.
  • a change in the measured quantity exceeds a predetermined value, which indicates that the laundry is tangled
  • drum rotation is controlled.
  • the entanglement determination unit calculates a change in an amplitude value and a frequency component value of a signal obtained from the vibration detection unit, and determines whether or not the laundry is entangled.
  • the object is achieved by a method for recognizing laundry winders in a laundry drying device with a horizontally rotatable laundry drum, in which a time The course of an electrical resistance of laundry in the laundry drum is recorded during a drying process with the laundry drum rotating, the temporal course is transformed into a frequency pattern, a temporal sequence of a frequency position of at least one frequency peak in the frequency pattern is monitored and if a frequency change of the at least a monitored frequency position reaches at least a predetermined value, a laundry winder is inferred from laundry located in the laundry drum.
  • the knowledge that there are laundry winders in turn makes it possible to take measures to save energy and / or to achieve a desired degree of dryness more precisely.
  • This method uses the principle of mechanical slip to differentiate the laundry wrapper from a normal laundry case. This is because the rotating drum takes the laundry with it in its rotational movement through frictional adhesion and, if necessary, entrainers present in the laundry drum. This generates at least one frequency peak (also referred to as "frequency peak") in the frequency spectrum of the resistance signal at a certain frequency. When the laundry rolls up, its speed changes and the frequency peak or its frequency position shifts in the frequency spectrum. If the position of the frequency peak changes sufficiently over the course of the drying process, it is concluded that a laundry winder is present. This recognition of laundry winders via the frequency spectrum is particularly reliable, robust and precise. This is also due to the fact that the frequency position of the frequency peak (s) is independent of the initial humidity of the laundry, the process air temperature and the water composition (e.g. conductivity, hardness, ).
  • the process can be implemented particularly cost-effectively.
  • the method is suitable for various types of laundry drying devices, including laundry drying devices with a heat pump.
  • the clothes drying device can be a clothes dryer or a combined washing and drying device (“washer-dryer”).
  • the laundry drying device can be a Be circulating air or an exhaust air device.
  • the laundry drying device can have a heat pump.
  • the laundry drying device can be a domestic appliance.
  • the laundry drum can be loaded from the front.
  • the laundry drum can have drivers attached to its inside.
  • the time profile of the electrical resistance or the determined resistance values corresponds in particular to a link between the resistance values and associated, respectively different measurement times.
  • the resistance values can be determined values directly or processed (e.g. smoothed, adjusted for outliers, etc.) values.
  • the time profile of the electrical resistance can also be referred to as a measurement curve or resistance curve.
  • a frequency pattern can also be referred to as a frequency curve or frequency profile.
  • One or more frequency peaks can occur in the frequency spectrum. If several frequency peaks occur in the frequency spectrum, precisely one or more frequency peaks or their frequency positions can be monitored or evaluated.
  • the method further includes that the frequency change is a frequency shift of at least one monitored frequency peak or frequency position, which is at least one predefined variable at least one predefined first threshold value, and a laundry wrapper is then deduced if the frequency shift reaches or exceeds the first threshold value.
  • the first threshold values assigned to the frequency shifts ⁇ fa and ⁇ fb can be the same or different.
  • the at least one frequency peak can also only be monitored for compliance with one of these conditions. When monitoring several frequency peaks, different first threshold values for the frequency shifts ⁇ fa and / or ⁇ fb can be assigned to respective frequency peaks.
  • a laundry winder is inferred if the frequency shift .DELTA.fa and / or .DELTA.fb reaches or exceeds a predefined first threshold value within a predefined period of time.
  • the predefined period of time can be a permanently predefined period of time, which can be referred to, for example, as a (concurrent) monitoring time window.
  • the predetermined period of time can also be a period of time that changes in the course of the drying process, which can be dependent on a drying parameter such as a degree of humidity etc. and / or on a program parameter such as a current remaining drying time etc., for example.
  • the duration can correspond to the total duration of the drying process that has passed so far.
  • the method additionally or alternatively includes that the frequency change is a temporal frequency change of a monitored frequency peak, the predetermined variable is at least one predetermined second threshold value and a laundry wrapper is then deduced if the temporal frequency change reaches or exceeds the predetermined second threshold value.
  • the frequency change is a temporal frequency change of a monitored frequency peak
  • the predetermined variable is at least one predetermined second threshold value
  • a laundry wrapper is then deduced if the temporal frequency change reaches or exceeds the predetermined second threshold value.
  • a laundry winder can be inferred if the frequency change over time ( ⁇ f / ⁇ t) or ⁇ f / ⁇ t reaches or exceeds the predefined second threshold value.
  • second threshold values which are dependent on a direction of the frequency change over time can also be assumed here.
  • the at least one frequency peak can only be monitored for compliance with one of these conditions.
  • the at least one monitored frequency peak comprises a highest frequency peak or frequency position of the highest frequency peak.
  • a frequency peak is particularly easy to find and evaluate.
  • the frequency position can be determined particularly precisely here.
  • the at least one frequency peak can only comprise or be the highest frequency peak, which keeps numerical expenditure low.
  • the highest frequency peak can e.g. be determined by the highest value (amplitude) in the entire frequency pattern or by the highest value in a given frequency section (e.g. a section in which the first frequency peak is to be expected).
  • the at least one monitored frequency peak additionally comprises at least one further frequency peak, e.g. a second highest frequency peak, etc.
  • the selected frequency peaks can alternatively or additionally be determined by their frequency position, e.g. a second highest frequency peak in a range with higher frequencies than the frequency position of the highest frequency peak, etc.
  • the transformation is carried out by means of a real-valued, discrete, linear, orthogonal transformation.
  • the transformation can be, for example, a discrete cosine transformation (DCT) or a discrete Fourier transformation (DFT).
  • DCT discrete cosine transformation
  • DFT discrete Fourier transformation
  • the transformation is carried out by means of a fast Fourier transformation or FFT transformation, which is particularly easy to implement and numerically efficient.
  • the measured values of the electrical resistance can be determined in a basically known manner, for example according to the two methods described at the beginning.
  • the moisture measurement is carried out by applying a rectangular alternating voltage signal to associated measuring electrodes.
  • the measured values are recorded with a constant repetition time or the resistance values are measured with a constant repetition time, e.g. a predetermined number of measured values are recorded per second.
  • the laundry drum is operated at a constant target speed to record the time profile of the electrical resistance. This advantageously enables a particularly sharp position of the frequency peaks and thus a particularly precise detection of the laundry curlers.
  • the laundry drum is driven by means of a brushless direct current motor.
  • a brushless direct current motor This has the advantage that with its help an actual speed of the laundry drum can be kept at or close to the target speed, which enables a particularly sharp position of the frequency peaks and thus a particularly precise determination of a laundry winder with simple means.
  • other motors can also be used to drive the laundry drum, for example a three-phase asynchronous machine or ASM motor.
  • the at least one action comprises a time-controlled change of direction of rotation or a reversing of the laundry drum. In this way, the laundry curlers dissolve again and the laundry items are dried more evenly.
  • the at least one action comprises adapting, in particular lengthening, a remaining running time of a drying process. This makes it possible to compensate for a poorer drying efficiency caused by - possibly occasionally occurring - laundry winders.
  • a remaining running time can in particular be understood to mean a time displayed in a display device of the laundry drying device.
  • the at least one action comprises an adjustment of at least one switching parameter of the drying process.
  • a switching parameter can mean a value of an operating parameter (e.g. a humidity, a temperature, etc.) and / or or at least a predetermined time that influences the program sequence. For example, when a laundry winder is detected - possibly with the same remaining running time - the times or durations of certain program sections and / or temperature settings for certain program sections can be adjusted. In this way, the duration of a heat input program section can be lengthened compared to an anti-crease program section, etc.
  • an operating parameter e.g. a humidity, a temperature, etc.
  • the object is also achieved by a laundry drying device which is set up to carry out the method.
  • the laundry drying device can be designed analogously to the method and has the same advantages.
  • the tumble dryer can be used like an in EP 2 593 601 B1 described laundry drying device, which has also been adapted to carry out the method, for example by a corresponding programming of a data processing device.
  • EP 2 593 601 B1 Features described can also be used for the present laundry drying device.
  • the laundry drying device has for this purpose: a horizontally rotatable laundry drum for receiving laundry to be dried, a resistance measuring device for measuring an electrical resistance of the laundry, which resistance measuring device has at least two measuring electrodes arranged for contact with the laundry, a data processing device coupled to the resistance measuring device for transforming a time Course of the measured electrical resistance values in a frequency pattern, for monitoring or evaluating a temporal sequence or a temporal course of at least one frequency peak in the frequency pattern and for determining or recognizing a laundry winder when a frequency change in a frequency position of the at least one monitored frequency peak is at least one predetermined Size reached.
  • the resistance measuring device can have associated measuring electrodes. These can be arranged, for example, in a bearing plate or in the laundry drum.
  • the measuring electrodes can be two metal strips that are attached parallel to one another on a lower door opening edge in the bearing plate.
  • the laundry drying device in particular its resistance measuring device or its data processing device, can have a voltage generating device for applying a low direct voltage to the measuring electrodes.
  • the voltage generating device can be coupled to the resistance measuring device and / or the data processing device.
  • the laundry drying device in particular its resistance measuring device or its data processing device, can alternatively or additionally have a voltage generating device for applying an - in particular rectangular - alternating voltage signal with, for example, high frequency to the measuring electrodes.
  • the voltage generating device can be coupled to the resistance measuring device and / or the data processing device.
  • the laundry drying device can also have a bridge circuit, eg an H-bridge, over which the resulting measurement signals are passed.
  • the data processing device can be set up to smooth measurement signals or resistance measurement values, e.g. values passed via a bridge circuit, e.g. by means of an outlier test in which a largest and / or a smallest value are not taken into account.
  • the data processing device can also be set up or designed to smooth measurement signals or resistance measurement values by filtering, e.g. Bessel filtering.
  • the laundry drying device can be set up to detect a laundry load in the laundry drum.
  • the data processing device can be set up to recognize a laundry winder as a function of the laundry load.
  • the threshold values can be adapted as a function of the laundry load.
  • the data processing device can be set up to recognize the laundry load from the time profile of the electrical resistance in addition to recognizing a laundry winder. This enables a particularly inexpensive implementation.
  • the data processing device can be an evaluation device or have an evaluation function. It can have a microcontroller, microprocessor, ASIC, FPGA, etc. It can have one or more volatile and / or non-volatile memories, e.g. for storing characteristics, control programs, etc.
  • the data processing device can be a unit or a distributed system.
  • the data processing device can be a control device for operating the laundry drying device, in particular its central control device or control unit.
  • Fig. 1 shows, as a sectional illustration in side view, a laundry drying device 1 with a horizontally rotatable laundry drum 2 for receiving laundry W to be dried (see FIG Figures 2A-2D and Figures 3A-3D ).
  • the laundry drying device 1 also has a resistance measuring device 3 for measuring an electrical resistance of the laundry W, which has two measuring electrodes 4 arranged for contact with the laundry W. Of the resistance measuring device 3, only one measuring electrode 4 is shown here, which is attached to a lower door opening edge in a front end plate 5.
  • the laundry drying device 1 is set up to apply a direct voltage or an alternating voltage to the measuring electrodes 4.
  • the resistance measuring device 3 is connected to a data processing device in the form of a control device 6.
  • the control device 6 can control the operation of the laundry drying device 1 and is used to identify laundry curlers, possibly also to determine the moisture content of the laundry W and / or possibly to determine the laundry load, namely here a determination of the weight of the dry laundry W.
  • the laundry drum 2 there are drivers 7 arranged on the inside parallel to an axis of rotation D of the laundry drum 2.
  • the laundry drum 2 is driven by means of a motor 8, for example by means of a BLDC motor or an ASM motor.
  • the control device 6 is connected to the motor 8 for its operation and can set a target speed nshould be specified.
  • the laundry drying device 1 can be analogous to EP 2 593 601 B1 be constructed, but is now set up as an alternative or in addition to the detection of laundry rollers, for example by a corresponding programming of the control device 6.
  • Fig.2A to Fig.2D show, as a sectional representation in a front view, a laundry drum 2 loaded with laundry W without a laundry winder in several rotational positions rotated in a clockwise direction.
  • the rotating laundry drum 2 takes the laundry W with it in its rotational movement by frictional adhesion and the drivers 7.
  • a “laundry” speed nw of the laundry W corresponds approximately to an actual speed nist of the laundry drum 2, that is to say that nw ⁇ nist applies.
  • Laundry slippage nw - nist is therefore negligibly small. If the drum is not fully loaded, nw> nist applies, so that noticeable laundry slip then occurs.
  • Fig.3A to Fig.3D show analogous to Fig.2A to Fig.2D as a sectional view in front view of a laundry drum 2 loaded with entangled laundry W in several rotational positions rotated clockwise. If the washing drum contains 2 washing machines, it is more compact than without a washing machine. Thus, the contact area between the laundry and the drum decreases. A center of mass of the laundry no longer coincides with the axis of rotation of the drum. Carriers have to move a larger mass and the laundry detaches from the drum earlier and returns to the lower area of the drum. As a result, the path that an item of laundry covers is shorter and the laundry rotates faster. This causes the laundry W to rotate in the laundry drum 2 at a higher laundry speed. The laundry slippage is therefore usually noticeably greater than in the absence of laundry winders.
  • a time profile of an electrical resistance can be recorded via the measuring electrodes 4 by determining several measured values m of the electrical resistance per second for a predetermined period of time, for example using one of the two methods described at the beginning.
  • This time course is transformed into a frequency pattern by the control device 6 by means of a fast Fourier transformation.
  • a sequence of 2 r (with r, for example 6, 7, 8 etc.) measured values [m] is evaluated.
  • the control device 6 By means of the control device 6, at least one frequency peak is identified in the frequency pattern and its frequency position f is stored with an associated time stamp.
  • the time stamp can, for example, be the point in time of the last resistance measurement value m of the associated measurement curve or the sequence of measurement values [m].
  • This results in a time profile [f] of the frequency position f.
  • the control device 6 then monitors this frequency position f or its temporal course [f] for a frequency change and evaluates it for the presence of a laundry winder.
  • Fig. 4 shows, as a plot of an amplitude A in any units against a frequency f in Hz, a frequency pattern transformed from a sequence of measured values [m].
  • the frequency pattern several frequency peaks P1, P2, P3 and P4 occur at frequency positions f1, f2, f3 and f4, respectively, the frequency peak P1 being the highest frequency peak.
  • the frequency peaks P1 to P4 are shown here as discrete lines, they can in principle also have a finite curve width.
  • the control device 6 can use the frequency position f1, f2, f3 and / or f4 of precisely one frequency peak P1 to P4 (in particular the highest frequency peak P1) or several of the frequency peaks P1 to P4 for recognizing laundry winders.
  • Fig. 5 shows, as a plot of a frequency against time, a course [f1] of the frequency position f1 of the highest frequency peak P1 during a drying process.
  • a frequency change in the form of a frequency shift ⁇ f1 of the frequency position (n) f1 in the associated curve [f1] is evaluated, here purely by way of example starting from the first point in time (time stamp) of the entire curve [f1].
  • the frequency shift ⁇ f1 can be evaluated, e.g. starting from a first point in time of a concurrent monitoring time window (not shown), etc.
  • the control device 6 If the value of the frequency shift ⁇ f1 exceeds a predetermined threshold value S, which happens here at a point in time tw, this is recognized by the control device 6 as the presence of a laundry winder. The control device 6 can then reverse a direction of rotation, as a result of which the laundry winder, as can be seen from the again decreasing frequency shift ⁇ f1, is released again. Alternatively or additionally, a remaining drying time of the drying process can be increased in order to achieve a user-set degree of drying particularly reliably.

Description

Die Erfindung betrifft ein Verfahren zum Erkennen von Wäschewicklern in einem Wäschetrocknungsgerät mit einer horizontal drehbaren Wäschetrommel. Die Erfindung betrifft auch ein Wäschetrocknungsgerät, das zur Durchführung des Verfahrens eingerichtet ist.The invention relates to a method for recognizing laundry winders in a laundry drying device with a horizontally rotatable laundry drum. The invention also relates to a laundry drying device which is set up to carry out the method.

Bei einem Bewegen von Wäsche in einer drehbaren Wäschetrommel eines Wäschetrocknungsgeräts kann es zu sog. "Wäschewicklern" (auch als Wäscheverknotung bezeichnet) kommen, welche das Trocknungsergebnis negativ beeinflussen. Unter Wäschewicklern wird ein Aufrollen von Wäschestücken oder ein Einrollen von Wäschestücken in andere Wäschestücke verstanden, so dass die verwickelten Wäschestücke sich nicht mehr frei in der Wäschetrommel bewegen können.When laundry is moved in a rotatable laundry drum of a laundry dryer, so-called "laundry winders" (also referred to as laundry knots) can occur, which negatively affect the drying result. Under laundry winders a rolling up of laundry items or a rolling of laundry items into other laundry items is understood, so that the entangled laundry items can no longer move freely in the laundry drum.

Es ist eine Wäschetrommel bekannt, bei der zwei speziell geformte Mitnehmer sich gegenüberliegend angeordnet sind. Durch die Mitnehmer wird die Wäsche so bewegt, dass nur wenige Wäschewickler entstehen oder sich Wickler lösen können, weil sie im passenden Winkel auf die Mitnehmer fallen. Jedoch kann durch die Mitnehmer nicht zuverlässig verhindert werden, dass sich Wäschewickler bilden und auch bestehen bleiben.A laundry drum is known in which two specially shaped drivers are arranged opposite one another. The carriers move the laundry in such a way that only a few wrappers are created or that the curlers can come loose because they fall onto the carriers at the right angle. However, the drivers cannot reliably prevent laundry curlers from forming and remaining in place.

DE 10 2013 215 675 A1 offenbart ein Verfahren zum Betreiben eines Wäschetrocknungsgeräts mit einer horizontal gelagerten, drehbaren Wäschetrommel, wobei das Verfahren mindestens den Schritt eines Bestimmens eines Grades einer Wäscheverknotung (Wicklerbildung) von in der Wäschetrommel befindlichen Wäschestücken aufweist. Der Schritt des Bestimmens kann ein Bestimmen des Grades der Wäscheverknotung aus einer Auswertung von regelmäßig wiederkehrenden Spitzen eines über eine Drehlage der Wäschetrommel bestimmten elektrischen Motorsignals, insbesondere Motorstromsignals, umfassen. DE 10 2013 215 675 A1 discloses a method for operating a laundry drying device with a horizontally mounted, rotatable laundry drum, the method comprising at least the step of determining a degree of laundry knotting (curling) of laundry items located in the laundry drum. The step of determining can include determining the degree of laundry knotting from an evaluation of regularly recurring peaks of an electrical motor signal, in particular a motor current signal, determined via a rotational position of the laundry drum.

Es sind zudem Wäschetrockner bekannt, bei denen eine Feuchtigkeit der Wäsche mittels einer elektrischen Widerstandsmessung bestimmt wird. Der Widerstandsmesseinrichtung zugehörige Messelektroden sind dabei im Lagerschild oder in der Trommel angeordnet. Beispielsweise können die Messelektroden zwei Metallstreifen sein, die parallel zueinander an einer unteren Türöffnungskante in dem Lagerschild angebracht sind. Zur Widerstandsmessung wird ausgenutzt, dass die Wäsche die Messelektroden elektrisch überbrückt. Der elektrische Widerstand der Wäsche ist dabei von der Menge des in der Wäsche gebundenen Wassers abhängig: je trockener die Wäsche wird, desto höher wird ihr elektrischer Widerstand. Zur Widerstandsmessung sind zwei unterschiedliche Methoden bekannt. Bei einer ersten Methode zur Feuchtigkeitsbestimmung wird an die Messelektroden eine niedrige Gleichspannung angelegt. Das sich ergebende Messsignal wird über einen Spannungsteiler geleitet. Aus dem, ggf. gemittelten, Messsignal wird der Widerstandswert bestimmt. Aus dem Widerstandswert wiederum werden die Feuchtigkeit bzw. der Trockengrad der Wäsche anhand einer entsprechenden Kennlinie bestimmt. Bei einer zweiten Methode wird an die Messelektroden ein rechteckiges Wechselspannungssignal mit hoher Frequenz angelegt. Das sich ergebende Messsignal kann über eine Brückenschaltung, z.B. eine H-Brücke, geleitet werden. Zur Glättung der Messsignale können aus mehreren (z.B. jeweils acht aufeinanderfolgenden) Messsignalen das Messsignal mit dem höchsten Wert und das Messsignal mit dem niedrigsten Wert gestrichen werden und dann das Messsignal mit dem niedrigsten Wert der verbleibenden Werte zur Weiterverarbeitung ausgewählt werden. Die ausgewählten Messsignale können mittels eines Bessel-Filters weiter geglättet werden. Der Trockengrad kann aus dem oder den Bessel-gefilterten Messsignal(en) bestimmt werden, z.B. mittels einer Kennlinie.There are also known tumble dryers in which the humidity of the laundry is determined by means of an electrical resistance measurement. Measuring electrodes belonging to the resistance measuring device are arranged in the end shield or in the drum. For example, the measuring electrodes can be two metal strips that are attached parallel to one another on a lower door opening edge in the bearing plate. For resistance measurement takes advantage of the fact that the laundry electrically bridges the measuring electrodes. The electrical resistance of the laundry depends on the amount of water bound in the laundry: the drier the laundry, the higher its electrical resistance. Two different methods are known for measuring resistance. In a first method of determining moisture content, a low DC voltage is applied to the measuring electrodes. The resulting measurement signal is passed through a voltage divider. The resistance value is determined from the measurement signal, averaged if necessary. From the resistance value, in turn, the moisture or the degree of dryness of the laundry are determined using a corresponding characteristic curve. In a second method, a square alternating voltage signal with a high frequency is applied to the measuring electrodes. The resulting measurement signal can be routed via a bridge circuit, for example an H-bridge. To smooth the measurement signals, the measurement signal with the highest value and the measurement signal with the lowest value can be deleted from several (e.g. eight consecutive) measurement signals and then the measurement signal with the lowest value of the remaining values can be selected for further processing. The selected measurement signals can be smoothed further using a Bessel filter. The degree of dryness can be determined from the Bessel-filtered measurement signal (s), for example by means of a characteristic curve.

Beispielsweise EP 2 593 601 B1 offenbart ein Verfahren zum Betreiben eines Wäschetrocknergeräts zum Trocknen von Wäsche, bei dem ein Wechselspannungssignal an Wäsche angelegt wird, ein Feuchtigkeitsgehalt der Wäsche bestimmt wird, indem ein durch die Wäsche fließender Strom gemessen wird, wobei zum Bestimmen des Feuchtigkeitsgehalts aus dem gemessenen Strom ein Hüllkurvensignal aufeinanderfolgender Abtastwerte erzeugt wird. EP 2 593 601 B1 offenbart auch, dass ein Wäschetrocknergerät so ausgelegt sein kann, dass es zum Trocknen von Wäsche durch ein Verfahren betrieben wird, bei dem: ein Wechselspannungssignal an Wäsche angelegt wird und ein Feuchtigkeitsgehalt der Wäsche bestimmt wird, indem ein durch die Wäsche geleiteter Strom gemessen wird, und zum Bestimmen des Feuchtigkeitsgehalts aus dem gemessenen Stromwert ein Hüllkurvensignal aufeinanderfolgender Abtastwerte erzeugt wird. Das Wäschetrocknergerät umfasst beispielsweise einen Wechselspannungsgenerator, der eine Wechselspannung erzeugt, mindestens eine Elektrode, die mit Ausgängen des Wechselspannungsgenerators verbunden ist, wobei die mindestens eine Elektrode von der Wäsche bedeckt sein kann, und einen Steuerkreis, der zum Bestimmen einer kennzeichden Größe für einen Feuchtigkeitsgehalt der Wäsche aus einem gemessenen Wechselstrom zwischen den Elektroden funktionell mit der mindestens einen Elektrode verbunden ist.For example EP 2 593 601 B1 discloses a method for operating a tumble dryer device for drying laundry, in which an alternating voltage signal is applied to laundry, a moisture content of the laundry is determined by measuring a current flowing through the laundry, an envelope signal successively for determining the moisture content from the measured current Samples is generated. EP 2 593 601 B1 also discloses that a clothes dryer apparatus can be adapted to operate to dry laundry by a method in which: an AC voltage signal is applied to laundry and a moisture content of the laundry is determined by measuring a current conducted through the laundry; and in order to determine the moisture content from the measured current value, an envelope curve signal of successive sampled values is generated. The tumble dryer device comprises, for example, an alternating voltage generator that generates an alternating voltage, at least one electrode which is connected to outputs of the alternating voltage generator, wherein the at least one electrode can be covered by the laundry, and a control circuit which is used to determine a characteristic Size for a moisture content of the laundry from a measured alternating current between the electrodes is functionally connected to the at least one electrode.

WO 2016/085252 A1 offenbart einen Wäschetrockner, dessen Steuereinrichtung eine Informationsempfangseinheit zum Empfangen von Informationen über zu trocknende Gegenständen, die einen Zustand der zu trocknenden Gegenstände innerhalb einer Trommel anzeigen. Zusätzlich vergleicht die Steuereinrichtung eine zeitliche Heizleistung eines Heizgeräts mit einer Ausgabe während eines normalen Betriebs und verringert die Heizleistung des Heizgeräts auf der Basis des Zustands der zu trocknenden Gegenstände, beruhend auf den Informationen, oder steuert eine Trocknungsdauer auf Basis des Zustands der zu trocknenden Gegenstände und der Heizleistung. WO 2016/085252 A1 discloses a clothes dryer, the control device of which includes an information receiving unit for receiving information on objects to be dried indicating a state of the objects to be dried within a drum. In addition, the control device compares a heating output over time of a heater with an output during normal operation, and reduces the heating output of the heater based on the state of the objects to be dried based on the information, or controls a drying period based on the state of the objects to be dried and the heating power.

JP 2010051431 A offenbart eine Methode zur Bestimmung eines Verwicklungszustands von Wäsche. Eine Waschmaschine umfasst dazu eine Vibrationserfassungseinheit zum Erfassen einer Vibration einer Aufnahmewanne und eine Verwicklungszustandsbestimmungseinheit, die eine Änderung der durch die Vibrationserfassungseinheit erfassten Vibration erfasst. Wenn eine Änderung der gemessenen Größe einen vorbestimmten Wert überschreitet, der angibt, dass die Wäsche verwickelt ist, wird eine Trommeldrehung gesteuert. Dazu berechnet die Verwicklungszustandsbestimmungseinheit eine Änderung eines Amplitudenwerts und eines Frequenzkomponentenwerts eines Signals, das von der Vibrationserfassungseinheit erhalten wird, und bestimmt, ob die Wäsche verwickelt ist oder nicht. JP 2010051431 A discloses a method for determining entanglement of laundry. For this purpose, a washing machine comprises a vibration detection unit for detecting a vibration of a receiving pan and a tangled state determination unit which detects a change in the vibration detected by the vibration detection unit. When a change in the measured quantity exceeds a predetermined value, which indicates that the laundry is tangled, drum rotation is controlled. To this end, the entanglement determination unit calculates a change in an amplitude value and a frequency component value of a signal obtained from the vibration detection unit, and determines whether or not the laundry is entangled.

Es ist die Aufgabe der vorliegenden Erfindung, die Nachteile des Standes der Technik zumindest teilweise zu überwinden und insbesondere eine besonders zuverlässige und preiswert umsetzbare Möglichkeit bereitzustellen, Wäschewickler in einer drehbaren Wäschetrommel zu erkennen.It is the object of the present invention to at least partially overcome the disadvantages of the prior art and, in particular, to provide a particularly reliable and inexpensive way of recognizing laundry wrappers in a rotatable laundry drum.

Diese Aufgabe wird gemäß den Merkmalen der unabhängigen Ansprüche gelöst. Bevorzugte Ausführungsformen sind insbesondere den abhängigen Ansprüchen entnehmbar.This object is achieved according to the features of the independent claims. Preferred embodiments can be inferred in particular from the dependent claims.

Die Aufgabe wird gelöst durch ein Verfahren zum Erkennen von Wäschewicklern in einem Wäschetrocknungsgerät mit einer horizontal drehbaren Wäschetrommel, bei dem ein zeitlicher Verlauf eines elektrischen Widerstands von in der Wäschetrommel befindlicher Wäsche während eines Trocknungsvorgangs bei sich drehender Wäschetrommel aufgenommen wird, der zeitliche Verlauf in ein Frequenzmuster transformiert wird, eine zeitliche Abfolge einer Frequenzlage mindestens einer Frequenzspitze in dem Frequenzmuster überwacht wird und dann, wenn eine Frequenzänderung der mindestens einen überwachten Frequenzlage mindestens eine vorgegebene Größe erreicht, auf einen Wäschewickler von in der Wäschetrommel befindlicher Wäsche geschlossen wird. Die Kenntnis eines Vorliegens von Wäschewicklern wiederum ermöglicht es, Maßnahmen zu ergreifen, um eine Energieeinsparung und/oder ein genaueres Erreichen eines gewünschten Trockengrads zu erreichen.The object is achieved by a method for recognizing laundry winders in a laundry drying device with a horizontally rotatable laundry drum, in which a time The course of an electrical resistance of laundry in the laundry drum is recorded during a drying process with the laundry drum rotating, the temporal course is transformed into a frequency pattern, a temporal sequence of a frequency position of at least one frequency peak in the frequency pattern is monitored and if a frequency change of the at least a monitored frequency position reaches at least a predetermined value, a laundry winder is inferred from laundry located in the laundry drum. The knowledge that there are laundry winders in turn makes it possible to take measures to save energy and / or to achieve a desired degree of dryness more precisely.

Dieses Verfahren nutzt das Prinzip des mechanischen Schlupfs aus, um Wäschewickler von einem normalen Wäschefall zu differenzieren. Die drehende Trommel nimmt nämlich durch Reibhaftung und ggf. in der Wäschetrommel vorhandene Mitnehmer die Wäsche in ihrer rotatorischen Bewegung mit. Dies erzeugt im Frequenzspektrum des Widerstandssignals mindestens eine Frequenzspitze (auch als "Frequenzpeak" bezeichnet), bei einer bestimmten Frequenz. Wenn die Wäsche sich zusammenrollt, ändert sich ihre Drehzahl, und die Frequenzspitze bzw. deren Frequenzlage verschiebt sich in dem Frequenzspektrum. Wenn sich die Lage der Frequenzspitze über den Trocknungsverlauf stark genug verändert, wird darauf geschlossen, dass ein Wäschewickler vorliegt. Diese Erkennung von Wäschewicklern über das Frequenzspektrum ist besonders zuverlässig, robust und präzise. Dies liegt auch daran, dass die Frequenzlage der Frequenzspitze(n) unabhängig von der Anfangsfeuchtigkeit der Wäsche, der Prozesslufttemperatur und der Wasserzusammensetzung (z.B. Leitfähigkeit, Härte, ...) ist.This method uses the principle of mechanical slip to differentiate the laundry wrapper from a normal laundry case. This is because the rotating drum takes the laundry with it in its rotational movement through frictional adhesion and, if necessary, entrainers present in the laundry drum. This generates at least one frequency peak (also referred to as "frequency peak") in the frequency spectrum of the resistance signal at a certain frequency. When the laundry rolls up, its speed changes and the frequency peak or its frequency position shifts in the frequency spectrum. If the position of the frequency peak changes sufficiently over the course of the drying process, it is concluded that a laundry winder is present. This recognition of laundry winders via the frequency spectrum is particularly reliable, robust and precise. This is also due to the fact that the frequency position of the frequency peak (s) is independent of the initial humidity of the laundry, the process air temperature and the water composition (e.g. conductivity, hardness, ...).

Zudem sind vorteilhafterweise keine baulichen Veränderungen an Wäschetrocknungsgeräten nötig, die bereits mit Messelektroden zur Widerstandsmessung ausgerüstet sind, z.B. um darüber einen Feuchtigkeitsgrad zu bestimmen. So kann das Verfahren besonders kostengünstig umgesetzt werden. Zudem ist das Verfahren für verschiedene Arten von Wäschetrocknungsgeräten geeignet, und zwar auch für Wäschetrocknungsgeräte mit Wärmepumpe.In addition, there is advantageously no need to make structural changes to laundry drying devices that are already equipped with measuring electrodes for resistance measurement, e.g. to use them to determine a degree of humidity. In this way, the process can be implemented particularly cost-effectively. In addition, the method is suitable for various types of laundry drying devices, including laundry drying devices with a heat pump.

Das Wäschetrocknungsgerät kann ein Wäschetrockner oder ein kombiniertes Wasch- und Wäschetrocknungsgerät ("Waschtrockner") sein. Das Wäschetrocknungsgerät kann ein Umluft- oder ein Abluftgerät sein. Das Wäschetrocknungsgerät kann eine Wärmepumpe aufweisen. Das Wäschetrocknungsgerät kann ein Haushaltsgerät sein.The clothes drying device can be a clothes dryer or a combined washing and drying device (“washer-dryer”). The laundry drying device can be a Be circulating air or an exhaust air device. The laundry drying device can have a heat pump. The laundry drying device can be a domestic appliance.

Die Wäschetrommel kann frontseitig beschickbar sein. Die Wäschetrommel kann an ihrer Innenseite angebrachte Mitnehmer aufweisen.The laundry drum can be loaded from the front. The laundry drum can have drivers attached to its inside.

Der zeitliche Verlauf des elektrischen Widerstands bzw. der bestimmten Widerstandswerte entspricht insbesondere einer Verknüpfung der Widerstandswerte mit zugehörigen, jeweils unterschiedlichen Messzeitpunkten. Die Widerstandswerte können unmittelbar bestimmte Werte oder bearbeitete (z.B. geglättete, um Ausreißer bereinigte usw.) Werte sein. Der zeitliche Verlauf des elektrischen Widerstands kann auch als Messkurve oder Widerstandskurve bezeichnet werden. Ein Frequenzmuster kann auch als Frequenzkurve oder Frequenzverlauf bezeichnet werden.The time profile of the electrical resistance or the determined resistance values corresponds in particular to a link between the resistance values and associated, respectively different measurement times. The resistance values can be determined values directly or processed (e.g. smoothed, adjusted for outliers, etc.) values. The time profile of the electrical resistance can also be referred to as a measurement curve or resistance curve. A frequency pattern can also be referred to as a frequency curve or frequency profile.

In dem Frequenzspektrum können eine oder mehrere Frequenzspitzen auftreten. Treten in dem Frequenzspektrum mehrere Frequenzspitzen auf, können davon genau eine oder mehrere Frequenzspitzen bzw. deren Frequenzlagen überwacht bzw. ausgewertet werden.One or more frequency peaks can occur in the frequency spectrum. If several frequency peaks occur in the frequency spectrum, precisely one or more frequency peaks or their frequency positions can be monitored or evaluated.

Das Verfahren umfasst ferner, dass die Frequenzänderung eine Frequenzverschiebung mindestens einer überwachten Frequenzspitze bzw. Frequenzlage ist, die mindestens eine vorgegebene Größe mindestens ein vorgegebener erster Schwellwert ist und dann auf einen Wäschewickler geschlossen wird, wenn die Frequenzverschiebung den ersten Schwellwert erreicht oder überschreitet. Dies ergibt den Vorteil, dass ein Wäschewickler besonders zuverlässig erkannt werden kann. Bewegt sich z.B. eine überwachte Frequenzspitze von einer Frequenzlage f(ti) zu einer Frequenzlage f(tj) = (f(ti) + Δfa) mit tj > ti und Δfa > 0 und/oder zu einer Frequenzlage f(tj) = f(ti) - Δfb mit Δfb > 0, so kann auf einen Wäschewickler geschlossen werden, wenn die Frequenzverschiebungen Δfa und/oder Δfb einen vorgegebenen ersten Schwellwert erreichen oder überschreiten. Die den Frequenzverschiebungen Δfa und Δfb zugeordneten ersten Schwellwerte können gleich oder unterschiedlich sein. Die mindestens eine Frequenzspitze kann auch nur auf Erfüllung einer dieser Bedingungen überwacht werden. Bei Überwachen mehrerer Frequenzspitzen können jeweiligen Frequenzspitzen unterschiedliche erste Schwellwerte für die Frequenzverschiebungen Δfa und/oder Δfb zugeordnet sein.The method further includes that the frequency change is a frequency shift of at least one monitored frequency peak or frequency position, which is at least one predefined variable at least one predefined first threshold value, and a laundry wrapper is then deduced if the frequency shift reaches or exceeds the first threshold value. This has the advantage that a laundry winder can be identified particularly reliably. For example, if a monitored frequency peak moves from a frequency position f (ti) to a frequency position f (tj) = (f (ti) + Δfa) with tj> ti and Δfa> 0 and / or to a frequency position f (tj) = f ( ti) - Δfb with Δfb> 0, it can be concluded that there is a laundry winder if the frequency shifts Δfa and / or Δfb reach or exceed a predetermined first threshold value. The first threshold values assigned to the frequency shifts Δfa and Δfb can be the same or different. The at least one frequency peak can also only be monitored for compliance with one of these conditions. When monitoring several frequency peaks, different first threshold values for the frequency shifts Δfa and / or Δfb can be assigned to respective frequency peaks.

Es ist eine Weiterbildung, dass dann auf einen Wäschewickler geschlossen wird, wenn die Frequenzverschiebung Δfa und/oder Δfb einen vorgegebenen ersten Schwellwert innerhalb einer vorgegebenen Zeitdauer erreicht oder überschreitet. So kann eine noch größere Zuverlässigkeit bei der Erkennung von Wäschewicklern erreicht werden, da nicht durch eine Bildung eines Wäschewicklers bedingte langfristige Frequenzverschiebungen effektiver ausgeschlossen werden können. Die vorgegebene Zeitdauer kann eine fest vorgegebene Zeitdauer sein, die z.B. als ein (mitlaufendes) Überwachungs-Zeitfenster bezeichnet werden kann. Die vorgegebene Zeitdauer kann auch eine sich im Laufe des Trocknungsvorgangs ändernde Zeitdauer sein, die beispielsweise von einem Trocknungsparameter wie einem Feuchtigkeitsgrad usw. und/oder von einem Programmparameter wie einer aktuellen Resttrocknungszeit usw. abhängig sein kann. Alternativ kann die Zeitdauer der gesamten bisher vergangenen Zeitdauer des Trocknungsvorgangs entsprechen.It is a further development that a laundry winder is inferred if the frequency shift .DELTA.fa and / or .DELTA.fb reaches or exceeds a predefined first threshold value within a predefined period of time. In this way, even greater reliability can be achieved in the detection of laundry rollers, since long-term frequency shifts that are not caused by the formation of a laundry roller can be more effectively excluded. The predefined period of time can be a permanently predefined period of time, which can be referred to, for example, as a (concurrent) monitoring time window. The predetermined period of time can also be a period of time that changes in the course of the drying process, which can be dependent on a drying parameter such as a degree of humidity etc. and / or on a program parameter such as a current remaining drying time etc., for example. Alternatively, the duration can correspond to the total duration of the drying process that has passed so far.

Das Verfahren umfasst zusätzlich oder alternativ, dass die Frequenzänderung eine zeitliche Frequenzänderung einer überwachten Frequenzspitze ist, die vorgegebene Größe mindestens ein vorgegebener zweiter Schwellwert ist und dann auf einen Wäschewickler geschlossen wird, wenn die zeitliche Frequenzänderung den vorgegebenen zweiten Schwellwert erreicht oder überschreitet. Auch dies ergibt den Vorteil, dass ein Wäschewickler besonders zuverlässig erkannt werden kann. Dabei wird ausgenutzt, dass sich Wäschewickler häufig innerhalb einer typischen vorgegebenen Zeitdauer Δt bilden. Bewegt sich z.B. eine überwachte Frequenzspitze innerhalb der vorgegebenen Zeitdauer Δt von einer Frequenzlage f1(ti) zu einer Frequenzlage f(tj) = (f(ti) +/- Δf) mit tj > ti, Δt ≥ (tj - ti) und Δf > 0, so kann auf einen Wäschewickler geschlossen werden, wenn die zeitliche Frequenzänderung (Δf / Δt) oder ∂f/∂t den vorgegebenen zweiten Schwellwert erreicht oder überschreitet. Analog zur oben beschriebenen Auswertung einer Frequenzverschiebung können auch hierbei von einer Richtung der zeitlichen Frequenzänderung abhängige zweite Schwellwerte angenommen werden. Dabei kann auch hier die mindestens eine Frequenzspitze nur auf Erfüllung einer dieser Bedingungen überwacht werden. Bei Überwachen mehrerer Frequenzspitzen können jeweiligen Frequenzspitzen unterschiedliche zweite Schwellwerte für die zeitliche Frequenzänderung zugeordnet sein.The method additionally or alternatively includes that the frequency change is a temporal frequency change of a monitored frequency peak, the predetermined variable is at least one predetermined second threshold value and a laundry wrapper is then deduced if the temporal frequency change reaches or exceeds the predetermined second threshold value. This also results in the advantage that a laundry winder can be identified particularly reliably. This makes use of the fact that laundry curlers frequently form within a typical predetermined time period Δt. For example, if a monitored frequency peak moves within the specified time period Δt from a frequency position f1 (ti) to a frequency position f (tj) = (f (ti) +/- Δf) with tj> ti, Δt ≥ (tj - ti) and Δf > 0, a laundry winder can be inferred if the frequency change over time (Δf / Δt) or ∂f / ∂t reaches or exceeds the predefined second threshold value. Analogous to the evaluation of a frequency shift described above, second threshold values which are dependent on a direction of the frequency change over time can also be assumed here. Here, too, the at least one frequency peak can only be monitored for compliance with one of these conditions. When monitoring several frequency peaks, different second threshold values for the frequency change over time can be assigned to respective frequency peaks.

Es ist eine Ausgestaltung, dass die mindestens eine überwachte Frequenzspitze eine höchste Frequenzspitze bzw. Frequenzlage der höchsten Frequenzspitze umfasst. Eine solche Frequenzspitze ist besonders einfach auffindbar und auswertbar. Zudem kann die Frequenzlage hierbei besonders genau bestimmt werden. Insbesondere kann die mindestens eine Frequenzspitze nur die höchste Frequenzspitze umfassen oder sein, was einen numerischen Aufwand gering hält. Die höchste Frequenzspitze kann z.B. durch den höchsten Wert (Amplitude) in dem gesamten Frequenzmuster oder durch den höchsten Wert in einem vorgegebenen Frequenzausschnitt (z.B. einem Ausschnitt, in dem die erste Frequenzspitze zu erwarten ist) bestimmt werden.It is an embodiment that the at least one monitored frequency peak comprises a highest frequency peak or frequency position of the highest frequency peak. Such a frequency peak is particularly easy to find and evaluate. In addition, the frequency position can be determined particularly precisely here. In particular, the at least one frequency peak can only comprise or be the highest frequency peak, which keeps numerical expenditure low. The highest frequency peak can e.g. be determined by the highest value (amplitude) in the entire frequency pattern or by the highest value in a given frequency section (e.g. a section in which the first frequency peak is to be expected).

Es ist eine weitere Ausgestaltung, dass die mindestens eine überwachte Frequenzspitze zusätzlich mindestens eine weitere Frequenzspitze umfasst, z.B. eine zweithöchste Frequenzspitze usw. Dies ergibt den Vorteil, dass die Beladung besonders präzise bestimmbar ist. Die ausgewählten Frequenzspitzen können alternativ oder zusätzlich durch ihre Frequenzlage bestimmt sein, z.B. eine zweithöchste Frequenzspitze in einem Bereich mit höheren Frequenzen als der Frequenzlage der höchsten Frequenzspitze usw.It is a further embodiment that the at least one monitored frequency peak additionally comprises at least one further frequency peak, e.g. a second highest frequency peak, etc. This results in the advantage that the loading can be determined particularly precisely. The selected frequency peaks can alternatively or additionally be determined by their frequency position, e.g. a second highest frequency peak in a range with higher frequencies than the frequency position of the highest frequency peak, etc.

Es ist eine Weiterbildung, dass das Transformieren mittels einer reellwertigen, diskreten, linearen, orthogonalen Transformation durchgeführt wird. Die Transformation kann z.B. eine diskrete Kosinustransformation (DCT) oder eine diskrete Fourier-Transformation (DFT) sein. Die Nutzung einer diskreten Fourier-Transformation weist den Vorteil auf, dass sich im Frequenzbereich besonders deutlich voneinander beabstandete Frequenzspitzen und damit Frequenzlagen ergeben.It is a further development that the transformation is carried out by means of a real-valued, discrete, linear, orthogonal transformation. The transformation can be, for example, a discrete cosine transformation (DCT) or a discrete Fourier transformation (DFT). The use of a discrete Fourier transformation has the advantage that frequency peaks and thus frequency positions that are particularly clearly spaced from one another result in the frequency range.

Es ist eine Ausgestaltung, dass das Transformieren mittels einer schnellen Fourier-Transformation oder FFT-Transformation durchgeführt wird, was besonders einfach implementierbar und numerisch effizient ist.It is an embodiment that the transformation is carried out by means of a fast Fourier transformation or FFT transformation, which is particularly easy to implement and numerically efficient.

Die Messwerte des elektrischen Widerstands können auf grundsätzlich bekannt Weise bestimmt werden, z.B. nach den beiden eingangs beschriebenen Methoden. So ist es eine Ausgestaltung, dass die Feuchtigkeitsmessung mittels Anlegens eines rechteckigen Wechselspannungssignals an zugehörige Messelektroden durchgeführt wird.The measured values of the electrical resistance can be determined in a basically known manner, for example according to the two methods described at the beginning. In one embodiment, the moisture measurement is carried out by applying a rectangular alternating voltage signal to associated measuring electrodes.

Es ist eine Weiterbildung, dass die Messwerte mit einer konstanten Wiederholdauer aufgenommen bzw. die Widerstandswerte mit einer konstanten Wiederholdauer gemessen werden, z.B. eine vorgegebene Zahl von Messwerten pro Sekunde aufgenommen werden.It is a further development that the measured values are recorded with a constant repetition time or the resistance values are measured with a constant repetition time, e.g. a predetermined number of measured values are recorded per second.

Es ist ferner eine Ausgestaltung, dass die Wäschetrommel zum Aufnehmen des zeitlichen Verlaufs des elektrischen Widerstands mit einer konstanten Soll-Drehzahl betrieben wird. Dies ermöglicht vorteilhafterweise eine besonders scharfe Lage der Frequenzspitzen und damit eine besonders genaue Erkennung der Wäschewickler.It is also an embodiment that the laundry drum is operated at a constant target speed to record the time profile of the electrical resistance. This advantageously enables a particularly sharp position of the frequency peaks and thus a particularly precise detection of the laundry curlers.

Es ist auch eine Ausgestaltung, dass die Wäschetrommel mittels eines bürstenlosen Gleichstrommotors angetrieben wird. Dieser weist den Vorteil auf, dass mit seiner Hilfe eine Ist-Drehzahl der Wäschetrommel an oder nahe an der Soll-Drehzahl gehalten werden kann, was mit einfachen Mitteln eine besonders scharfe Lage der Frequenzspitzen und damit eine besonders genaue Bestimmung eines Wäschewicklers ermöglicht. Jedoch können grundsätzlich auch andere Motoren zum Antrieb der Wäschetrommel verwendet werden, beispielsweise eine Drehstrom-Asynchronmaschine oder ASM-Motor.It is also an embodiment that the laundry drum is driven by means of a brushless direct current motor. This has the advantage that with its help an actual speed of the laundry drum can be kept at or close to the target speed, which enables a particularly sharp position of the frequency peaks and thus a particularly precise determination of a laundry winder with simple means. However, in principle, other motors can also be used to drive the laundry drum, for example a three-phase asynchronous machine or ASM motor.

Es ist eine Ausgestaltung, dass nachdem dann, wenn auf einen Wäschewickler geschlossen worden ist, mindestens eine Aktion oder Maßnahme ausgelöst wird. So kann vorteilhafterweise auf einen Wäschewickler reagiert werden, z.B. um Energie einzusparen und/oder um ein Trocknungsergebnis zu verbessern.It is an embodiment that after at least one action or measure is triggered when a laundry winder has been concluded. In this way, it is possible to react advantageously to a laundry winder, e.g. to save energy and / or to improve the drying result.

Es ist eine Ausgestaltung, dass die mindestens eine Aktion einen zeitgesteuerten Drehrichtungswechsel bzw. ein Reversieren der Wäschetrommel umfasst. So sich Wäschewickler wieder auflösen und eine gleichmäßigere Trocknung der Wäschestücke erreicht werden.It is an embodiment that the at least one action comprises a time-controlled change of direction of rotation or a reversing of the laundry drum. In this way, the laundry curlers dissolve again and the laundry items are dried more evenly.

Es ist eine Ausgestaltung, dass die mindestens eine Aktion ein Anpassen, insbesondere Verlängern, einer Restlaufzeit eines Trocknungsvorgangs umfasst. Dadurch kann eine durch - ggf. zeitweilig auftretende - Wäschewickler bewirkte schlechtere Trocknungseffizienz ausgeglichen werden. Unter einer Restlaufzeit kann insbesondere eine in einer Anzeigeeinrichtung des Wäschetrocknungsgeräts angezeigte Zeit verstanden werden.It is an embodiment that the at least one action comprises adapting, in particular lengthening, a remaining running time of a drying process. This makes it possible to compensate for a poorer drying efficiency caused by - possibly occasionally occurring - laundry winders. A remaining running time can in particular be understood to mean a time displayed in a display device of the laundry drying device.

Es ist eine Ausgestaltung, dass die mindestens eine Aktion ein Anpassen mindestens eines Schaltparameters des Trocknungsvorgangs umfasst. Auch dadurch kann eine durch Wäschewickler bewirkte schlechtere Trocknungseffizienz ausgeglichen werden. Unter einem Schaltparameter kann ein Wert eines Betriebsparameters (z.B. einer Feuchtigkeit, einer Temperatur usw.) und/oder oder mindestens eine vorgegebene Zeit, die den Programmablauf beeinflusst, gemeint sein. Beispielsweise können so bei Feststellung eines Wäschewicklers - ggf. bei gleicher Restlaufzeit - die Zeiten bzw. Zeitdauern bestimmter Programmabschnitte und/oder Temperatureinstellungen für bestimmte Programmabschnitte abgepasst werden. So kann eine Dauer eines Wärmeeinbringungs-Programmabschnitts gegenüber einem Anti-Knitter-Programmabschnitt verlängert werden usw.It is an embodiment that the at least one action comprises an adjustment of at least one switching parameter of the drying process. This also makes it possible to compensate for a poorer drying efficiency caused by a laundry wrapper. A switching parameter can mean a value of an operating parameter (e.g. a humidity, a temperature, etc.) and / or or at least a predetermined time that influences the program sequence. For example, when a laundry winder is detected - possibly with the same remaining running time - the times or durations of certain program sections and / or temperature settings for certain program sections can be adjusted. In this way, the duration of a heat input program section can be lengthened compared to an anti-crease program section, etc.

Die Aufgabe wird auch gelöst durch ein Wäschetrocknungsgerät, das zum Durchführen des Verfahrens eingerichtet ist. Das Wäschetrocknungsgerät kann analog zu dem Verfahren ausgebildet werden und weist die gleichen Vorteile auf.The object is also achieved by a laundry drying device which is set up to carry out the method. The laundry drying device can be designed analogously to the method and has the same advantages.

Es ist ein besonderer Vorteil, dass das Verfahren auf Wäschetrocknungsgeräten ablaufen kann, die wie bisher konstruktiv oder "hardwäremäßig" ausgebildet sind. So kann das Wäschetrocknungsgerät wie ein in EP 2 593 601 B1 beschriebenes Wäschetrocknungsgerät aufgebaut sein, das zusätzlich zum Durchführen des Verfahrens angepasst worden ist, beispielsweise durch ein entsprechendes Programmieren einer Datenverarbeitungseinrichtung. Folglich können sämtliche in EP 2 593 601 B1 beschriebenen Merkmale auch für das vorliegende Wäschetrocknungsgerät verwendet werden.It is a particular advantage that the method can run on laundry drying devices which, as before, are designed in terms of construction or "hardware". The tumble dryer can be used like an in EP 2 593 601 B1 described laundry drying device, which has also been adapted to carry out the method, for example by a corresponding programming of a data processing device. As a result, all in EP 2 593 601 B1 Features described can also be used for the present laundry drying device.

Das Wäschetrocknungsgerät weist dazu auf: eine horizontal drehbare Wäschetrommel zur Aufnahme von zu trocknender Wäsche, eine Widerstandsmesseinrichtung zum Messen eines elektrischen Widerstands der Wäsche, welche Widerstandsmesseinrichtung mindestens zwei zur Berührung mit der Wäsche angeordnete Messelektroden aufweist, eine mit der Widerstandsmesseinrichtung gekoppelte Datenverarbeitungseinrichtung zum Transformieren eines zeitlichen Verlaufs der gemessenen elektrischen Widerstandswerte in ein Frequenzmuster, zum Überwachen bzw. Auswerten einer zeitliche Abfolge bzw. eines zeitlichen Verlaufs mindestens einer Frequenzspitze in dem Frequenzmuster und zum Bestimmen bzw. Erkennen eines Wäschewicklers, wenn eine Frequenzänderung einer Frequenzlage der mindestens einen überwachten Frequenzspitze mindestens eine vorgegebene Größe erreicht.The laundry drying device has for this purpose: a horizontally rotatable laundry drum for receiving laundry to be dried, a resistance measuring device for measuring an electrical resistance of the laundry, which resistance measuring device has at least two measuring electrodes arranged for contact with the laundry, a data processing device coupled to the resistance measuring device for transforming a time Course of the measured electrical resistance values in a frequency pattern, for monitoring or evaluating a temporal sequence or a temporal course of at least one frequency peak in the frequency pattern and for determining or recognizing a laundry winder when a frequency change in a frequency position of the at least one monitored frequency peak is at least one predetermined Size reached.

Die Widerstandsmesseinrichtung kann zugehörige Messelektroden aufweisen. Diese können beispielsweise in einem Lagerschild oder in der Wäschetrommel angeordnet sein. Beispielsweise können die Messelektroden zwei Metallstreifen sein, die parallel zueinander an einer unteren Türöffnungskante in dem Lagerschild angebracht sind.The resistance measuring device can have associated measuring electrodes. These can be arranged, for example, in a bearing plate or in the laundry drum. For example, the measuring electrodes can be two metal strips that are attached parallel to one another on a lower door opening edge in the bearing plate.

Das Wäschetrocknungsgerät, insbesondere dessen Widerstandsmesseinrichtung oder dessen Datenverarbeitungseinrichtung, kann eine Spannungserzeugungseinrichtung zum Anlegen einer niedrigen Gleichspannung an die Messelektroden aufweisen. Die Spannungserzeugungseinrichtung kann mit der Widerstandsmesseinrichtung und/oder der Datenverarbeitungseinrichtung gekoppelt sein.The laundry drying device, in particular its resistance measuring device or its data processing device, can have a voltage generating device for applying a low direct voltage to the measuring electrodes. The voltage generating device can be coupled to the resistance measuring device and / or the data processing device.

Das Wäschetrocknungsgerät, insbesondere dessen Widerstandsmesseinrichtung oder dessen Datenverarbeitungseinrichtung, kann alternativ oder zusätzlich eine Spannungserzeugungseinrichtung zum Anlegen eines - insbesondere rechteckigen - Wechselspannungssignals mit z.B. hoher Frequenz an die Messelektroden aufweisen. Die Spannungserzeugungseinrichtung kann mit der Widerstandsmesseinrichtung und/oder der Datenverarbeitungseinrichtung gekoppelt sein. Das Wäschetrocknungsgerät kann ferner eine Brückenschaltung, z.B. eine H-Brücke, aufweisen, über die sich ergebenden Messsignale geleitet werden.The laundry drying device, in particular its resistance measuring device or its data processing device, can alternatively or additionally have a voltage generating device for applying an - in particular rectangular - alternating voltage signal with, for example, high frequency to the measuring electrodes. The voltage generating device can be coupled to the resistance measuring device and / or the data processing device. The laundry drying device can also have a bridge circuit, eg an H-bridge, over which the resulting measurement signals are passed.

Die Datenverarbeitungseinrichtung kann dazu eingerichtet sein, Messsignale oder Widerstandsmesswerte zu glätten, z.B. über eine Brückenschaltung geleitete Werte, z.B. durch einen Ausreißertest, bei dem ein größter und/oder ein kleinster Wert nicht berücksichtigt werden. Die Datenverarbeitungseinrichtung kann ferner dazu eingerichtet oder ausgebildet sein, Messsignale oder Widerstandsmesswerte durch Filterung, z.B. eine Bessel-Filterung, zu glätten.The data processing device can be set up to smooth measurement signals or resistance measurement values, e.g. values passed via a bridge circuit, e.g. by means of an outlier test in which a largest and / or a smallest value are not taken into account. The data processing device can also be set up or designed to smooth measurement signals or resistance measurement values by filtering, e.g. Bessel filtering.

Das Wäschetrocknungsgerät kann dazu eingerichtet sein, eine Wäschebeladung der Wäschetrommel zu erkennen. Die Datenverarbeitungseinrichtung kann dazu eingerichtet sein, einen Wäschewickler in Abhängigkeit von der Wäschebeladung zu erkennen. Beispielsweise können die Schwellwerte in Abhängigkeit von der Wäschebeladung angepasst werden. Die Datenverarbeitungseinrichtung dazu eingerichtet sein, aus dem zeitlichen Verlauf des elektrischen Widerstands zusätzlich zum Erkennen eines Wäschewicklers die Wäschebeladung zu erkennen. So wird eine besonders preiswerte Umsetzung ermöglicht.The laundry drying device can be set up to detect a laundry load in the laundry drum. The data processing device can be set up to recognize a laundry winder as a function of the laundry load. For example, the threshold values can be adapted as a function of the laundry load. The data processing device can be set up to recognize the laundry load from the time profile of the electrical resistance in addition to recognizing a laundry winder. This enables a particularly inexpensive implementation.

Die Datenverarbeitungseinrichtung kann eine Auswerteeinrichtung sein oder eine Auswertefunktion aufweisen. Sie kann einen Mikrocontroller, Mikroprozessor, ASIC, FPGA usw. aufweisen. Sie kann einen oder mehrere flüchtige und/oder nichtflüchtige Speicher aufweisen, z.B. zum Speichern von Kennlinien, Steuerprogrammen usw.The data processing device can be an evaluation device or have an evaluation function. It can have a microcontroller, microprocessor, ASIC, FPGA, etc. It can have one or more volatile and / or non-volatile memories, e.g. for storing characteristics, control programs, etc.

Die Datenverarbeitungseinrichtung kann eine Einheit oder ein verteiltes System sein. Die Datenverarbeitungseinrichtung kann eine Steuereinrichtung zum Betreiben des Wäschetrocknungsgeräts sein, insbesondere dessen zentrale Steuereinrichtung oder Steuereinheit.The data processing device can be a unit or a distributed system. The data processing device can be a control device for operating the laundry drying device, in particular its central control device or control unit.

Die oben beschriebenen Eigenschaften, Merkmale und Vorteile dieser Erfindung sowie die Art und Weise, wie diese erreicht werden, werden klarer und deutlicher verständlich im Zusammenhang mit der folgenden schematischen Beschreibung eines Ausführungsbeispiels, das im Zusammenhang mit den Zeichnungen näher erläutert wird.

Fig.1
zeigt als Schnittdarstellung in Seitenansicht ein Wäschetrocknungsgerät mit einer horizontal drehbaren Wäschetrommel;
Fig.2A -2D
zeigen als Schnittdarstellung in Frontansicht die mit Wäsche ohne Wäschewickler beladene Wäschetrommel in mehreren Drehstellungen;
Fig.3A -3D
zeigen als Schnittdarstellung in Frontansicht die mit verwickelter Wäsche beladene Wäschetrommel in mehreren Drehstellungen;
Fig.4
zeigt als Auftragung einer Amplitude gegen eine Frequenz ein aus einer Folge von Messwerten transformiertes Frequenzmuster; und
Fig.5
zeigt als Auftragung einer Frequenz gegen die Zeit einen Verlauf einer Frequenzlage der höchsten Frequenzspitze des Frequenzmusters aus Fig.4 während eines Trocknungsvorgangs.
The properties, features and advantages of this invention described above and the manner in which they are achieved will become clearer and more clearly understandable in connection with the following schematic description of an exemplary embodiment which is explained in more detail in connection with the drawings.
Fig. 1
shows, as a sectional illustration in side view, a laundry drying device with a horizontally rotatable laundry drum;
Fig. 2A-2D
show, as a sectional view in front view, the laundry drum loaded with laundry without a laundry winder in several rotational positions;
Fig. 3A -3D
show, as a sectional view in front view, the laundry drum loaded with entangled laundry in several rotational positions;
Fig. 4
shows, as a plot of an amplitude against a frequency, a frequency pattern transformed from a sequence of measured values; and
Fig. 5
shows, as a plot of a frequency against time, a course of a frequency position of the highest frequency peak of the frequency pattern Fig. 4 during a drying process.

Fig.1 zeigt als Schnittdarstellung in Seitenansicht ein Wäschetrocknungsgerät 1 mit einer horizontal drehbaren Wäschetrommel 2 zur Aufnahme von zu trocknender Wäsche W (siehe Fig.2A-2D und Fig. 3A-3D). Das Wäschetrocknungsgerät 1 weist ferner eine Widerstandsmesseinrichtung 3 zum Messen eines elektrischen Widerstands der Wäsche W auf, welche zwei zur Berührung mit der Wäsche W angeordnete Messelektroden 4 aufweist. Von der Widerstandsmesseinrichtung 3 ist hier nur eine Messelektrode 4 eingezeichnet, die an einer unteren Türöffnungskante in einem frontseitigen Lagerschild 5 angebracht ist. Fig. 1 shows, as a sectional illustration in side view, a laundry drying device 1 with a horizontally rotatable laundry drum 2 for receiving laundry W to be dried (see FIG Figures 2A-2D and Figures 3A-3D ). The laundry drying device 1 also has a resistance measuring device 3 for measuring an electrical resistance of the laundry W, which has two measuring electrodes 4 arranged for contact with the laundry W. Of the resistance measuring device 3, only one measuring electrode 4 is shown here, which is attached to a lower door opening edge in a front end plate 5.

Das Wäschetrocknungsgerät 1 ist dazu eingerichtet, an die Messelektroden 4 eine Gleichspannung oder eine Wechselspannung anzulegen. Die Widerstandsmesseinrichtung 3 ist mit einer Datenverarbeitungseinrichtung in Form einer Steuereinrichtung 6 verbunden. Die Steuereinrichtung 6 kann den Betrieb des Wäschetrocknungsgeräts 1 steuern und dient zur Erkennung von Wäschewicklern, ggf. auch zur Bestimmung einer Feuchtigkeit der Wäsche W und/oder ggf. zur Bestimmung der Wäschebeladung, nämlich hier einer Bestimmung eines Gewichts der trockenen Wäsche W.The laundry drying device 1 is set up to apply a direct voltage or an alternating voltage to the measuring electrodes 4. The resistance measuring device 3 is connected to a data processing device in the form of a control device 6. The control device 6 can control the operation of the laundry drying device 1 and is used to identify laundry curlers, possibly also to determine the moisture content of the laundry W and / or possibly to determine the laundry load, namely here a determination of the weight of the dry laundry W.

In der Wäschetrommel 2 sind innenseitig parallel zu einer Drehachse D der Wäschetrommel 2 angeordnete Mitnehmer 7 vorhanden. Die Wäschetrommel 2 wird mittels eines Motors 8 angetrieben, z.B. mittels eines BLDC-Motors oder eines ASM-Motors. Die Steuereinrichtung 6 ist mit dem Motor 8 zu dessen Betrieb verbunden und kann eine Soll-Drehzahl nsoll vorgeben. Die Wäschetrommel 2 dreht sich dann mit einer Ist-Drehzahl nist, wobei z.B. für den Fall eines BLDC-Motors nist = nsoll gilt.In the laundry drum 2 there are drivers 7 arranged on the inside parallel to an axis of rotation D of the laundry drum 2. The laundry drum 2 is driven by means of a motor 8, for example by means of a BLDC motor or an ASM motor. The control device 6 is connected to the motor 8 for its operation and can set a target speed nshould be specified. The laundry drum 2 then rotates at an actual speed nact, with nact = nset, for example, in the case of a BLDC motor.

Das Wäschetrocknungsgerät 1 kann bauteiltechnisch analog zu EP 2 593 601 B1 aufgebaut sein, ist aber nun alternativ oder zusätzlich zur Erkennung von Wäschewicklern eingerichtet, z.B. durch eine entsprechende Programmierung der Steuereinrichtung 6.In terms of components, the laundry drying device 1 can be analogous to EP 2 593 601 B1 be constructed, but is now set up as an alternative or in addition to the detection of laundry rollers, for example by a corresponding programming of the control device 6.

Fig.2A bis Fig.2D zeigen als Schnittdarstellung in Frontansicht eine mit Wäsche W ohne Wäschewickler beladene Wäschetrommel 2 in mehreren im Uhrzeigersinn verdrehten Drehstellungen. Die drehende Wäschetrommel 2 nimmt durch Reibhaftung und die Mitnehmer 7 die Wäsche W in ihrer rotatorischen Bewegung mit. Eine "Wäsche-"Drehzahl nw der Wäsche W entspricht bei voller Beladung der Trommel ungefähr einer Ist-Drehzahl nist der Wäschetrommel 2, d.h., dass nw ≈ nist gilt. Ein Wäscheschlupf nw - nist ist dadurch vernachlässigbar gering. Wenn die Trommel nicht voll beladen ist, gilt nw > nist, so dass dann ein merklicher Wäscheschlupf auftritt. Fig.2A to Fig.2D show, as a sectional representation in a front view, a laundry drum 2 loaded with laundry W without a laundry winder in several rotational positions rotated in a clockwise direction. The rotating laundry drum 2 takes the laundry W with it in its rotational movement by frictional adhesion and the drivers 7. When the drum is fully loaded, a “laundry” speed nw of the laundry W corresponds approximately to an actual speed nist of the laundry drum 2, that is to say that nw ≈ nist applies. Laundry slippage nw - nist is therefore negligibly small. If the drum is not fully loaded, nw> nist applies, so that noticeable laundry slip then occurs.

Fig.3A bis Fig.3D zeigen analog zu Fig.2A bis Fig.2D als Schnittdarstellung in Frontansicht eine mit verwickelter Wäsche W beladene Wäschetrommel 2 in mehreren im Uhrzeigersinn verdrehten Drehstellungen. Wenn die Wäschetrommel 2 Wäschewickler enthält, ist sie kompakter als ohne Wäschewickler. Somit nimmt die Kontaktfläche zwischen der Wäsche und der Trommel ab. Ein Massenmittelpunkt der Wäsche stimmt nicht mehr mit der Drehachse der Trommel überein. Mitnehmer müssen eine größere Masse bewegen und die Wäsche löst sich früher von der Trommel ab und kehrt in den unteren Bereich der Trommel zurück. Dadurch ist der Weg, den ein Wäschestück zurücklegt, kürzer und die Wäsche rotiert schneller. Dies bewirkt, dass die Wäsche W sich mit einer höheren Wäsche-Drehzahl in der Wäschetrommel 2 dreht. Der Wäscheschlupf ist daher in der Regel merklich größer als bei einer Abwesenheit von Wäschewicklern. Fig.3A to Fig.3D show analogous to Fig.2A to Fig.2D as a sectional view in front view of a laundry drum 2 loaded with entangled laundry W in several rotational positions rotated clockwise. If the washing drum contains 2 washing machines, it is more compact than without a washing machine. Thus, the contact area between the laundry and the drum decreases. A center of mass of the laundry no longer coincides with the axis of rotation of the drum. Carriers have to move a larger mass and the laundry detaches from the drum earlier and returns to the lower area of the drum. As a result, the path that an item of laundry covers is shorter and the laundry rotates faster. This causes the laundry W to rotate in the laundry drum 2 at a higher laundry speed. The laundry slippage is therefore usually noticeably greater than in the absence of laundry winders.

Ein zeitlicher Verlauf eines elektrischen Widerstands kann über die Messelektroden 4 dadurch aufgenommen werden, dass für eine vorgegebene Zeitdauer mehrere Messwerte m des elektrischen Widerstands pro Sekunde bestimmt werden, beispielsweise über eine der beiden eingangs beschriebenen Methoden. Beispielsweise können für einen Zeitbereich von p Sekunden (z.B. von p = 128 Sekunden) q Messwerte (z.B. q = 4) Messwerte m pro Sekunde bestimmt werden, wodurch sich ein zeitlicher Verlauf bzw. eine Messkurve aus n = (p · q), z.B. 512, Messwerten [m] = [m(t1), ..., m(tn)], ergibt. Dieser zeitliche Verlauf wird von der Steuereinrichtung 6 mittels einer schnellen Fouriertransformation in ein Frequenzmuster transformiert. Dabei ist es zur einfachen Durchführung der schnellen Fouriertransformation besonders vorteilhaft, wenn eine Folge von 2r (mit r z.B. 6, 7, 8 usw.) Messwerten [m] ausgewertet wird. Mittels der Steuereinrichtung 6 wird in dem Frequenzmuster mindestens eine Frequenzspitze identifiziert und ihre Frequenzlage f mit einer zugehörigen Zeitmarke abgespeichert. Die Zeitmarke kann z.B. der Zeitpunkt des letzten Widerstandsmesswerts m der zugehörigen Messkurve bzw. der Folge von Messwerten [m] sein.A time profile of an electrical resistance can be recorded via the measuring electrodes 4 by determining several measured values m of the electrical resistance per second for a predetermined period of time, for example using one of the two methods described at the beginning. For example, q measured values (eg q = 4) measured values m per second can be determined for a time range of p seconds (for example p = 128 seconds), which results in a time profile or a measured curve results from n = (p · q), e.g. 512, measured values [m] = [m (t1), ..., m (tn)]. This time course is transformed into a frequency pattern by the control device 6 by means of a fast Fourier transformation. For the simple implementation of the fast Fourier transformation, it is particularly advantageous if a sequence of 2 r (with r, for example 6, 7, 8 etc.) measured values [m] is evaluated. By means of the control device 6, at least one frequency peak is identified in the frequency pattern and its frequency position f is stored with an associated time stamp. The time stamp can, for example, be the point in time of the last resistance measurement value m of the associated measurement curve or the sequence of measurement values [m].

Dieser Vorgang kann in einem mitlaufenden Zeitbereich mehrfach wiederholt werden, z.B. mit Folgen von Messwerten [m] = [m(t2), ..., m(t(n+1))], [m(t3), ..., m(t(n+2))] usw., mit Messwerten [m] = [m(t(n+1)), ..., m(t(2n))], [m(t(2n+1)), ..., m(t(3n))] usw., oder auch mit Messwerten [m] = [m(t(n/2+1)), ..., m(t(3n/2))], [m(t(n+1)), ..., m(t(2n))] usw. Daraus wiederum ergibt sich ein zeitlicher Verlauf [f] der Frequenzlage f. Folgend überwacht die Steuereinrichtung 6 diese Frequenzlage f bzw. deren zeitlichen Verlauf [f] auf eine Frequenzänderung hin und wertet sie auf ein Vorliegen eines Wäschewicklers hin aus.This process can be repeated several times in a running time range, e.g. with sequences of measured values [m] = [m (t2), ..., m (t (n + 1))], [m (t3), ... , m (t (n + 2))] etc., with measured values [m] = [m (t (n + 1)), ..., m (t (2n))], [m (t (2n +1)), ..., m (t (3n))] etc., or with measured values [m] = [m (t (n / 2 + 1)), ..., m (t (3n / 2))], [m (t (n + 1)), ..., m (t (2n))] etc. This in turn results in a time profile [f] of the frequency position f. The control device 6 then monitors this frequency position f or its temporal course [f] for a frequency change and evaluates it for the presence of a laundry winder.

Fig.4 zeigt als Auftragung einer Amplitude A in beliebigen Einheiten gegen eine Frequenz f in Hz ein aus einer Folge von Messwerten [m] transformiertes Frequenzmuster. In dem Frequenzmuster treten mehrere Frequenzspitzen P1, P2, P3 und P4 bei Frequenzlagen f1, f2, f3 bzw. f4 auf, wobei die Frequenzspitze P1 die höchste Frequenzspitze ist. Obwohl die Frequenzspitzen P1 bis P4 hier als diskrete Linien eingezeichnet sind, können sie grundsätzlich auch eine endliche Kurvenbreite aufweisen. Die Steuereinrichtung 6 kann zum, Erkennen von Wäschewicklern die Frequenzlage f1, f2, f3 und/oder f4 genau einer Frequenzspitze P1 bis P4 (insbesondere die höchste Frequenzspitze P1) oder mehrere der Frequenzspitzen P1 bis P4 nutzen. Fig. 4 shows, as a plot of an amplitude A in any units against a frequency f in Hz, a frequency pattern transformed from a sequence of measured values [m]. In the frequency pattern, several frequency peaks P1, P2, P3 and P4 occur at frequency positions f1, f2, f3 and f4, respectively, the frequency peak P1 being the highest frequency peak. Although the frequency peaks P1 to P4 are shown here as discrete lines, they can in principle also have a finite curve width. The control device 6 can use the frequency position f1, f2, f3 and / or f4 of precisely one frequency peak P1 to P4 (in particular the highest frequency peak P1) or several of the frequency peaks P1 to P4 for recognizing laundry winders.

Fig.5 zeigt als Auftragung einer Frequenz gegen die Zeit einen Verlauf [f1] der Frequenzlage f1 der höchsten Frequenzspitze P1 während eines Trocknungsvorgangs. Es wird dann, wenn eine Frequenzänderung dieser Frequenzlage f1 eine vorgegebene Größe erreicht, auf einen Wäschewickler von in der Wäschetrommel befindlicher Wäsche geschlossen wird. Fig. 5 shows, as a plot of a frequency against time, a course [f1] of the frequency position f1 of the highest frequency peak P1 during a drying process. When a frequency change in this frequency position f1 reaches a predetermined value, a conclusion is drawn that there is a laundry winder for laundry located in the laundry drum.

In diesem Ausführungsbeispiel wird eine Frequenzänderung in Form einer Frequenzverschiebung Δf1 der Frequenzlage(n) f1 in dem zugehörigen Verlaufs [f1] ausgewertet, und zwar hier rein beispielhaft ausgehend von dem ersten Zeitpunkt (Zeitmarke) des gesamten Verlaufs [f1]. Alternativ kann die Frequenzverschiebung Δf1 z.B. ausgehend von einem ersten Zeitpunkt eines mitlaufenden Überwachungszeitfensters (o. Abb.) usw. ausgewertet werden.In this exemplary embodiment, a frequency change in the form of a frequency shift Δf1 of the frequency position (n) f1 in the associated curve [f1] is evaluated, here purely by way of example starting from the first point in time (time stamp) of the entire curve [f1]. Alternatively, the frequency shift Δf1 can be evaluated, e.g. starting from a first point in time of a concurrent monitoring time window (not shown), etc.

Überschreitet der Wert der Frequenzverschiebung Δf1 einen vorgegebenen Schwellwert S, was hier zu einem Zeitpunkt tw geschieht, wird dies von der Steuereinrichtung 6 als Vorliegen eines Wäschewicklers erkannt. Folgend kann die Steuereinrichtung 6 eine Drehrichtung reversieren, wodurch der Wäschewickler, wie anhand der sich wieder verringernden Frequenzverschiebung Δf1 erkennbar, wieder aufgelöst wird. Alternativ oder zusätzlich kann eine Resttrocknungszeit des Trocknungsvorgangs erhöht werden, um einen nutzereingestellten Trocknungsgrad besonders zuverlässig zu treffen.If the value of the frequency shift Δf1 exceeds a predetermined threshold value S, which happens here at a point in time tw, this is recognized by the control device 6 as the presence of a laundry winder. The control device 6 can then reverse a direction of rotation, as a result of which the laundry winder, as can be seen from the again decreasing frequency shift Δf1, is released again. Alternatively or additionally, a remaining drying time of the drying process can be increased in order to achieve a user-set degree of drying particularly reliably.

Selbstverständlich ist die vorliegende Erfindung nicht auf das gezeigte Ausführungsbeispiel beschränkt.Of course, the present invention is not restricted to the exemplary embodiment shown.

BezugszeichenlisteList of reference symbols

11
WäschetrocknungsgerätLaundry drying device
22
WäschetrommelLaundry drum
33
WiderstandsmesseinrichtungResistance measuring device
44th
MesselektrodeMeasuring electrode
55
LagerschildBearing shield
66th
SteuereinrichtungControl device
77th
MitnehmerCarrier
88th
Motorengine
AA.
Amplitudeamplitude
DD.
DrehachseAxis of rotation
ΔfΔf
FrequenzverschiebungFrequency shift
ff
Frequenzfrequency
nistnest
Ist-Drehzahl der WäschetrommelActual speed of the washing drum
nwnw
WäschedrehzahlWashing speed
SS.
SchwellwertThreshold
tt
Zeittime
twpartly
Zeitpunkt einer Erkennung eines WäschewicklersTime of detection of a laundry winder
WW.
WäscheLaundry

Claims (10)

  1. Method for identifying laundry tangles in a tumble dryer appliance (1) with a laundry drum (2) that can rotate horizontally, in which
    - a temporal course of an electrical resistance of laundry (W) located in the laundry drum (2) is recorded while the laundry drum (2) is rotating,
    - the temporal course is transformed into a frequency pattern (P1-P4),
    - a temporal sequence of a frequency position (f1) of at least one frequency peak (P1) of the frequency pattern (P1-P4) is monitored and
    - when a change in frequency (Δf) of the at least one monitored frequency position (f1) reaches at least one predefined variable (S), a laundry tangle consisting of laundry (W) located in the laundry drum (2) is inferred,
    wherein
    - the change in frequency (Δf) is a frequency shift, the at least one predefined variable (S) is at least one predefined first threshold value and a laundry tangle is inferred when the frequency shift (Δf) reaches or exceeds the predefined first threshold value (S),
    and/or wherein
    - the change in frequency is a change in frequency over time, the at least one predefined variable is at least one predefined second threshold value and a laundry tangle is inferred when the change in frequency over time reaches or exceeds the predefined second threshold value.
  2. Method according to claim 1, in which the at least one monitored frequency peak (P1) comprises or is a highest frequency peak.
  3. Method according to claim 2, in which the at least one monitored frequency peak additionally comprises at least one further frequency peak.
  4. Method according to one of the preceding claims, in which the transformation into the frequency pattern (P1-P4) is performed by means of a fast Fourier transformation (FFT).
  5. Method according to one of the preceding claims, in which the temporal course of the electrical resistance is ascertained by means of applying a rectangular AC voltage signal to associated measuring electrodes (4).
  6. Method according to one of the preceding claims, in which the laundry drum (2) is operated at a constant setpoint rotational speed to record the temporal course of the electrical resistance.
  7. Method according to one of the preceding claims, in which, once a laundry tangle is inferred, at least one action is triggered.
  8. Method according to claim 7, wherein the at least one action comprises reversing the laundry drum (2).
  9. Method according to one of claims 7 or 8, wherein the at least one action comprises adapting, in particular extending, a remaining running time of a drying procedure.
  10. Tumble dryer appliance (1), wherein the tumble tryer appliance (1) is configured to perform the method according to one of the preceding claims and at least has:
    - a laundry drum (2) that can rotate horizontally for accommodating laundry (W) to be dried,
    - a resistance measuring facility (3) for measuring an electrical resistance of the laundry (W), which resistance measuring facility (3) has at least two measuring electrodes (4) arranged for contact with the laundry and
    - a data processing facility (6), which is coupled to the resistance measuring facility (3) and is configured to perform the method.
EP19155900.4A 2018-02-20 2019-02-07 Detection of laundry coilers in laundry driers Active EP3527713B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018202527.4A DE102018202527A1 (en) 2018-02-20 2018-02-20 Detecting laundry wipers in laundry drying appliances

Publications (2)

Publication Number Publication Date
EP3527713A1 EP3527713A1 (en) 2019-08-21
EP3527713B1 true EP3527713B1 (en) 2021-07-07

Family

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EP19155900.4A Active EP3527713B1 (en) 2018-02-20 2019-02-07 Detection of laundry coilers in laundry driers

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EP (1) EP3527713B1 (en)
CN (1) CN110172809B (en)
DE (1) DE102018202527A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW249832B (en) * 1994-04-26 1995-06-21 Alps Seiko Kk Covering stud bolts used in construction
JP3340887B2 (en) * 1995-07-28 2002-11-05 株式会社東芝 Clothes dryer
JP2006204428A (en) * 2005-01-26 2006-08-10 Toshiba Corp Drum type washing/drying machine
JP2010051431A (en) * 2008-08-27 2010-03-11 Panasonic Corp Washing machine, method of determining state of laundry, and program
EP2407590A1 (en) 2010-07-13 2012-01-18 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a clothes drying appliance and clothes drying appliance
JP2012183142A (en) * 2011-03-04 2012-09-27 Panasonic Corp Clothes drying machine
JP2013183899A (en) * 2012-03-08 2013-09-19 Panasonic Corp Clothes dryer
DE102013215675A1 (en) 2013-08-08 2015-02-12 BSH Bosch und Siemens Hausgeräte GmbH Operating a laundry dryer with horizontally rotatable laundry drum
WO2016085252A1 (en) * 2014-11-28 2016-06-02 삼성전자주식회사 Dryer and method for controlling same

Also Published As

Publication number Publication date
EP3527713A1 (en) 2019-08-21
CN110172809B (en) 2022-12-09
DE102018202527A1 (en) 2019-08-22
CN110172809A (en) 2019-08-27

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