EP3653782A1 - Sèche-linge pourvu de capteur d'accélération et son procédé de fonctionnement - Google Patents

Sèche-linge pourvu de capteur d'accélération et son procédé de fonctionnement Download PDF

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Publication number
EP3653782A1
EP3653782A1 EP19203310.8A EP19203310A EP3653782A1 EP 3653782 A1 EP3653782 A1 EP 3653782A1 EP 19203310 A EP19203310 A EP 19203310A EP 3653782 A1 EP3653782 A1 EP 3653782A1
Authority
EP
European Patent Office
Prior art keywords
laundry
sensor
drum
sensors
control device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19203310.8A
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German (de)
English (en)
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EP3653782B1 (fr
Inventor
Bernd Mielke
Andreas Stolze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
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Publication of EP3653782A1 publication Critical patent/EP3653782A1/fr
Application granted granted Critical
Publication of EP3653782B1 publication Critical patent/EP3653782B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • 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
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/04—Quantity, e.g. weight or variation of weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/12—Temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/24—Spin speed; Drum movements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/34—Humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/04—Signal transfer or data transmission arrangements
    • D06F34/05—Signal transfer or data transmission arrangements for wireless communication between components, e.g. for remote monitoring or control
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
    • D06F37/06—Ribs, lifters, or rubbing means forming part of the receptacle
    • 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

Definitions

  • the invention relates to a clothes dryer with an acceleration sensor, with which improved control is possible, and a method for its operation.
  • the invention relates in particular to a tumble dryer with a control device, a drum for holding laundry items, in which at least one laundry carrier is arranged, the laundry carrier having a sensor arrangement with at least two sensors, an independent energy supply and an interface for wireless data communication, and at least one Evaluation unit for sensor signals of the sensor arrangement, the control device and sensor arrangement being set up to communicate with one another wirelessly.
  • tumble dryers are aimed at making operation safer and easier for a user, as well as continuously improving the drying programs carried out in terms of performance, time, energy consumption and environmental compatibility.
  • the ability to be able to determine operationally relevant parameters at any time is essential.
  • sensors are used for this purpose in tumble dryers, for example resistive or capacitive sensors, which allow the determination of a residual moisture in laundry items via a resistance measurement or a conclusion about the course of a process by measuring the temperature and / or the humidity of a process air used for drying Allow drying program so that, for example, a program end can be displayed.
  • the use of pressure sensors or acceleration sensors is also already known, for example in order to determine a load quantity. It is disadvantageous that such sensors are usually placed at different points in the tumble dryer, so that a high degree of inaccuracy of the measured sensor signals can result from the sensors detecting different measuring points.
  • sensors often require a lot of installation space, so that the arrangement cannot be designed flexibly and there is usually a large distance between the actual measurement object and the sensors the sensor signal is then inaccurate. It would therefore be desirable if a sensor arrangement could be implemented in the smallest possible space.
  • the publication DE 10 2012 217 975 A1 describes a household appliance with a control device for controlling operating processes of the household appliance, and with a battery-free electronic sensor unit for detecting at least one operating parameter of the household appliance, the sensor unit having a generator for providing electrical energy for the sensor unit from non-electrical energy and a transmitter which is designed for the wireless transmission of a radio signal characterizing at least one operating parameter to the control device.
  • the generator is a thermoelectric generator with two thermal contact surfaces, which is designed to provide the electrical energy due to a temperature difference between the contact surfaces.
  • the publication EP 1 895 043 A1 describes a washing machine and / or a tumble dryer, in particular for household use, equipped with a rotating drum for holding laundry items to be washed and / or dried, and with control means which can measure at least one functional parameter of the machine, for example the moisture content of the laundry items .
  • the said measuring means are connected to the control panel in order to operate them in accordance with the measured variable recognized.
  • the measuring means include a generator for electrical energy, which is directly associated with the rotating drum and communicates wirelessly with the control panel of the machine.
  • the generator for electrical energy comprises a permanent magnet which slides freely in a tube made of non-conductive material, at least one coil being wound on its outer surface, which is connected to an electrical control panel which is able to elaborate a voltage signal and send it to the machine control panel.
  • the publication EP 1 997 951 A1 describes a washing machine comprising a rotating laundry drum with a front access opening.
  • the washing machine further comprises an electrical device adapted to the drum and an electrical generator which is built into the drum and uses the rotation of the drum to generate the electrical energy necessary to operate the electrical device.
  • the publications DE 102 42 144 A1 and WO 2004/022836 A2 describe a tumble dryer with a rotating drum for receiving laundry to be dried, the drum having a sensor device for determining a physical value inside the drum, the sensor device is connected in a signal-transmitting manner to a controller of the tumble dryer, and the signal-transmitting connection is wireless and contactless is trained.
  • the publication DE 10 2006 053 274 A1 describes a method for determining the amount of load of laundry in a hold with an air outlet of a tumble dryer, in particular an exhaust air dryer, wherein the absolute humidity in the air outlet is measured from the hold and the amount of charge in the hold by determining the maximum value and / or the course of the absolute Air outlet humidity from the cargo hold is determined.
  • the publication WO 2013/182402 describes a washing machine or dryer comprising a drum into which laundry is placed, one or more baffles attached to the inner surface of the drum, one or more sensors placed in the drum, and a main control unit which controls washing or drying operations.
  • An additional control unit is arranged within the deflection part, which converts the analog signals received from the sensors into digital signals and transmits these signals to the main control unit.
  • a temperature sensor pointing inside the drum can be arranged on the surface of the deflecting part.
  • the additional control unit can carry out the wireless transmission of signals.
  • the publication WO 2018/015214 describes a household appliance with a control device and at least one sensor node, comprising at least one sensor, at least one evaluation unit, a self-sufficient energy supply and an interface for wireless data communication, the control device and the sensor node being set up to communicate wirelessly with one another, and the at least one sensor is a micromechanical sensor and the at least one sensor node is set up such that it is both controlled by the control device can be, as well as independently detect, evaluate and transmit at least one measurement signal to the control device.
  • the invention thus relates to a tumble dryer with a control device, a drum for holding laundry items, in which at least one laundry driver is arranged, the laundry driver having a sensor arrangement with at least two sensors, an autonomous energy supply unit and an interface for wireless data communication, and at least an evaluation unit for sensor signals of the sensor arrangement, wherein the control device and the sensor arrangement are set up to communicate wirelessly with one another, and an acceleration sensor and at least one electrode of a conductivity sensor and / or an air humidity sensor are arranged in the laundry carrier, and the control device is set up to prevent rotation of the Drum to determine a position of the laundry carrier, so that the sensor signals measured by the conductivity sensor and / or air humidity sensor can be assigned to the position of the laundry carrier.
  • the tumble dryer can be a dryer per se or a washer dryer, that is to say a device which combines the functions of a washing machine and a tumble dryer.
  • a capacitively operating sensor can be used as the acceleration sensor.
  • a sensor based on a resistance stress strip can also be used. Both single-axis and sensors with two or more measuring axes can also be used.
  • the acceleration sensor is a sensor with three measuring axes; in particular a micromechanical acceleration sensor with three measuring axes.
  • the acceleration sensor is a sensor with three measuring axes; in particular a micromechanical acceleration sensor with three measuring axes.
  • this acceleration sensor it is also advantageously possible to calculate both the load quantity and the slippage of the drum with respect to a drive motor and an imbalance of the drum and, if necessary, to be compensated for by the control device.
  • the position and speed of the drum can then also be recognized via the z measuring axis signal.
  • the acceleration signals can also be used to detect aging effects, such as wear on the drum bearings or aging of the drive train, and information can then optionally be output to a user via the control device.
  • a degree of loading of the drum with items of laundry can be measured precisely. Due to the rotation of the drum, the laundry items collide with the laundry driver and in this way generate an acceleration pulse, which is detected by the acceleration sensor. The degree of loading can then be determined from the type and amount of such a sensor signal. A variation over several different speeds increases the accuracy of the measurement.
  • At least two electrodes are used as conductivity sensors, which are arranged on at least one laundry driver, so that the conductivity can be measured between them.
  • the two electrodes can also be arranged on different laundry carriers. If the measured conductivity between the electrodes is comparatively low, it can be concluded that there are no damp laundry items between them. Depending on the arrangement and number of electrodes, depending on the corresponding sensor signals, the loading of the drum with wet laundry items can be concluded.
  • the counter electrode of the conductivity sensor is arranged on the same laundry carrier or on a different laundry carrier.
  • a drum jacket of the drum is used as the counter electrode of the conductivity sensor.
  • a laundry dryer is very particularly preferred, in which the control device is set up to determine a laundry moisture content and / or loading of the drum with laundry items on the basis of the sensor signals measured by the conductivity sensor and / or air humidity sensor.
  • the drum is filled differently.
  • the drum rotates this influences the laundry, whereby the speed of rotation of the drum also influences the laundry.
  • the drum rotates at a constant speed the amount of laundry depends on the amount of laundry and the laundry moisture.
  • areas of the drum shell and the laundry drivers come into contact with the laundry items at different times.
  • the sensor signals of the acceleration sensor are evaluated, so that those of the conductivity sensor and / or Humidity sensor measured sensor signals can be assigned to the position of the laundry carrier.
  • one of the measurement axes of the acceleration sensor is generally arranged parallel to the axis of rotation of the drum, so that the angular position of the drum and thus the position of the relevant laundry driver can be inferred from the two values of the acceleration in the other two directions.
  • the measured values of the air humidity and / or the conductance can thus be assigned to the position of the drum. From the strength of these sensor signals at this position, it can be concluded that items of laundry are loaded and their laundry moisture content. In this case, the temporal periodicity of the measured sensor signals can also be used, in particular if the drum rotation speed is known. Finally, with a lower load of laundry items, there is less contact of the laundry drivers with laundry items.
  • At least two sensors of the sensor arrangement are based on the same measuring principle and are arranged along the laundry carrier.
  • Laundry drivers are generally arranged essentially parallel to an axis of rotation of the drum, so that the term “along the laundry driver” is to be interpreted to mean that the arrangement is essentially parallel to the axis of rotation of the drum.
  • the sensors point at least in the direction of Laundry carrier a distance from each other, this distance is generally determined based on projections of the locations of the sensors on an imaginary axis that runs parallel to the axis of rotation of the drum.
  • Three sensors along the laundry carrier therefore define two distances, namely a first distance d 1 between a first sensor and a second sensor and a second distance d 2 between the second sensor and a third sensor.
  • the distances d 1 and d 2 can be the same or different. This applies accordingly in the case of four or more sensors for further distances d n (n> 2).
  • the measurement principle is selected from the physical properties of temperature, air humidity, pressure and / or conductivity, so that at least two sensors are each a temperature sensor, air humidity sensor, pressure sensor, conductivity sensor or any combination of these.
  • at least two sensors are each a temperature sensor, air humidity sensor, pressure sensor, conductivity sensor or any combination of these.
  • the optionally used temperature sensor is a micromechanical temperature sensor, which consists of an n-conducting silicon crystal, which is manufactured in planar technology.
  • multiple sensors are used as sensors which are based on several measurement principles at the same time.
  • Such space-saving dual or triple sensors are known per se.
  • the at least two sensors of the tumble dryer are preferably modular components with a size in the range of 2-4 x 2-4 x 0.5-1.5 mm 3 each.
  • the sensors are generally designed as micromechanical sensors. Since micromechanical sensors are particularly small-sized elements, ie require little installation space, two or more sensors can be combined, so that, for example, a dual sensor or a triple sensor is created. For this purpose, the sensor can be constructed in a modular manner.
  • the small-scale design of micromechanical sensors also offers a decisive further advantage. If micromechanical sensors are used, all sensors can measure on perform the same place. The sensor signals then all have a common local reference point. As a result, parameters obtained from individual sensor signals can be correlated with one another particularly precisely.
  • the sensor arrangement comprising the at least one micromechanical sensor, the interface for wireless data communication and the self-sufficient energy supply unit as well as, if necessary, the evaluation unit can be implemented in a particularly small installation space.
  • At least one sensor e.g. a micromechanical sensor
  • the sensor arrangement arranged in the laundry carrier is a pressure sensor with a membrane. Then a pressure that the items of laundry exert on the membrane upon contact with the laundry driver can advantageously be transmitted to the pressure element in the pressure sensor. This can additionally improve the determination of a loading of the drum with items of laundry.
  • the rotation of the drum causes the items of laundry to collide with the items of laundry and in this way generate pressure on the items of laundry which can be detected by a pressure sensor. From the type and the level of such a measurement signal, the degree of loading can then be determined in an alternative way to supplement it.
  • At least one sensor is a pressure sensor, in particular a micromechanical pressure sensor, in the event that the pressure sensor senses a sensor signal after the laundry dryer has been switched off after the laundry has been introduced into the drum, the at least one sensor arrangement can transmit the evaluated sensor signal to the control device and cause it to turn on the dryer.
  • the present invention enables a drying program to be tracked by evaluating sensor signals from sensors which are arranged in the direction of the laundry drivers or in the direction of the axis of rotation of the drum.
  • the process air flowing in a so-called process air duct passes through a generally existing heating device after it has been heated Into the drum from behind.
  • the originally very warm and dry process air cools down and at the same time absorbs moisture from the laundry items to be dried.
  • the laundry items are generally pushed forward toward an access door due to the flow of process air.
  • the items of laundry closest to the incoming process air are generally also dried the most.
  • a gradient of the temperature and the humidity of the process air will therefore result in the drum in the direction of its axis of rotation.
  • the most accurate determination of the location-dependent temperature and humidity of the air in the drum is important.
  • the laundry moisture content and the loading of the drum with laundry items can be better determined.
  • Non-uniformities in the drying can be compensated for, for example, by a suitable change in a blower output, a heating output and a drum rotation.
  • a desired end of drying can be determined more precisely.
  • At least three sensors are arranged along the at least one laundry carrier.
  • these sensors are based on the same measuring principle in order to change a property, e.g. to be able to track the humidity in the direction of the axis of rotation or the laundry carrier as precisely as possible.
  • the sensors discussed here are generally arranged on the surface of at least one laundry driver. However, it can be provided that one or more sensors are also arranged inside the laundry carrier or laundry carriers, for example a temperature sensor for monitoring the proper functioning of electronic components.
  • sensors arranged in the drum in laundry carriers can optionally be arranged in the process air duct, for example at the drum inlet and / or at the drum outlet.
  • the sensors can be based on various measuring principles, such as temperature, humidity and pressure, whereby dual and triple sensors can also be used. This outside of Drum-arranged sensors can also contribute to better monitoring of a drying program.
  • a laundry dryer is also preferred in which the control device is set up to determine the loading of the drum with laundry items and / or the degree of drying of the laundry items on the basis of the sensor signals measured by the sensors and / or the local gradients of the sensor signals in the direction of the laundry driver.
  • the control device In the case of an arrangement of sensors along a laundry carrier, it can namely be determined in a rotating drum from which distance from an access opening of the drum the sensor signals change in such a way that it can be assumed that no more laundry items are arranged here.
  • the reason for this is that depending on the amount of laundry in the drum, i.e. the loading of the drum, and the moisture of the laundry items can come to different fillings of the drum.
  • the laundry items With the preferred entry of the process air on a rear wall of the drum, the laundry items are pressed to a dryer door. Depending on the amount of laundry items in the drum, only a front area of the drum can be filled at this drum entrance.
  • the laundry items are dried more quickly at the drum inlet than at the drum outlet.
  • the invention enables this loading and moisture-dependent filling level and the moisture of the laundry items, i.e. their degree of dryness, depending on the drum depth, i.e. as a function of a point along the laundry carrier. The drying status of the laundry and the load can be determined even more precisely and a drying program can therefore be designed more precisely.
  • the control device is set up to take into account the strength of the air flow entering the drum to determine the loading of the drum with laundry items and / or the degree of drying of the laundry items.
  • the strength of the air flow includes both the amount and the flow rate of the process air.
  • the strength of the air flow can be adjusted via the performance of a fan in the drying duct of the tumble dryer.
  • the clothes dryer has at least two laundry drivers in which there is a sensor arrangement with at least two sensors, an autonomous energy supply and an interface for wireless data communication. It is in turn preferred that the control device of the tumble dryer is set up to load the drum with the aid of the sensor signals measured by the sensor arrangements in the at least two laundry drivers and / or the local gradients of the sensor signals in the direction of the laundry driver, taking into account the rotational speed of the drum To determine items of laundry. If the at least two laundry drivers each have an acceleration sensor, their local positions during rotation of the drum can also be taken into account.
  • a clothes dryer is preferred in which the at least one sensor arrangement is set up to be controlled by the control device and / or can independently measure, evaluate and transmit at least one sensor signal to the control device.
  • wireless communication between the control device and the at least one sensor arrangement is preferably possible in both directions.
  • a set of sensor signals that is independently detected and subsequently evaluated by the sensor arrangement can be transmitted to the control device.
  • the control device can, however, preferably also transmit a signal to the sensor arrangement, for example to query a sensor signal.
  • the control device is preferably set up to carry out an action in the tumble dryer on the basis of a sensor signal transmitted by the at least one sensor arrangement or an evaluation thereof.
  • action means any possibility of controlling the clothes dryer according to the invention.
  • An action can therefore be, for example, the execution of a drying program or also a partial section of a drying program.
  • a drying program in the sense of the invention can be a drying program implemented in the factory in a tumble dryer, or several additional options or a user-defined drying program.
  • the term drying program is thus to be interpreted broadly according to the invention.
  • an action within the meaning of the invention can also be the mere switching on or off of the tumble dryer, the switching on or off of a heater of the tumble dryer or a process air blower or the variation of their performance, the output of a display on a control element of the Clothes dryer or an acoustic signal for the output of information to a user.
  • control device and the at least one sensor arrangement are set up to communicate data wirelessly.
  • the at least one sensor arrangement and the control device and / or the evaluation unit are preferably set up to communicate with one another wirelessly via a low-power Bluetooth connection.
  • the connection can be implemented in all possible ways, for example via individual radio interfaces or also via interfaces in the evaluation unit and the control device.
  • the at least one laundry driver comprises an autonomous energy supply unit.
  • self-sufficient energy supply unit means that the energy supply unit is set up to generate energy independently, i.e. regardless of the energy supply of the dryer.
  • the sensor arrangement can also independently detect, evaluate and transmit a sensor signal to the control device when the clothes dryer is switched off.
  • the type of energy supply is not restricted. However, the energy supply can also take place, for example, thermoelectric, inductive or piezoelectric. In principle, any solution known from the prior art is possible here. In addition to this, batteries or accumulators can also be used for an energy supply.
  • the at least one thermopile element can be arranged in or on the laundry carrier. In contact with warm laundry, for example, or with warm process air, a temperature difference can then be generated at the two ends of the thermopile element. The voltage difference generated can then be tapped at one end.
  • the energy supply unit comprises a magnetic induction element, for example a coil and a magnet
  • the coil can be arranged in a laundry carrier and the magnet can be attached to the housing of the clothes dryer, so that the drum moves the coil past the magnet at a defined distance can be.
  • the induction current generated in this way can then be tapped.
  • a magnetic flux collector can also be used to increase the efficiency in order to transmit the magnetic fields to the coil through the opening in the drum.
  • the magnet can also be arranged in the laundry carrier, specifically in such a way that it can slide past the adjacent spool when the drum is moved up and down.
  • the energy supply unit can advantageously be fully integrated into the laundry consumer.
  • the self-sufficient energy supply unit comprises at least one piezo element for energy generation and is designed to generate electrical energy for the sensor arrangement, the interface for wireless data communication and / or the evaluation unit by mechanical deformation of at least one piezo element.
  • the invention thus advantageously uses the so-called piezoelectric effect, in which electrical charge is generated by mechanical deformation.
  • the optional at least one piezo element is a piezoceramic bending element.
  • the shape of the bending element is not restricted according to the invention, it can have any geometric shape. However, it is preferred if the bending element is flat, particularly preferably in a rectangular shape.
  • the size and the deflection of the bending element are also not restricted according to the invention. They will generally depend on the placement of the piezo element, as well as the mechanical stress exerted on the piezo element.
  • a piezoceramic flexure generally includes a flexure structure and electrodes.
  • the bending structure can be implemented in different ways, for example it can be a layer structure.
  • the bending structure can also be a combination of one or two piezoceramic components, which can also have at least one intermediate layer.
  • the piezoceramic components can also consist of individual layers and / or multilayers, the layer thickness of which is likewise not restricted.
  • the piezoceramic material is also not restricted according to the invention, for example lead zirconate titanate, but any other piezoceramic can also be used.
  • the optionally used piezoceramic bending element has a piezoceramic layer with a layer thickness of 100 to 500 ⁇ m.
  • the layer thickness is preferably in the range from 150 to 250 ⁇ m and is, for example, 200 ⁇ m.
  • This layer is then preferably designed as a plate and has a surface electrode on the top and the bottom, as well as a contact and two electrical connections.
  • the at least one optional piezo element is arranged in or on the laundry carrier in such a way that it can be deformed by the impact of laundry items on at least one laundry carrier during the rotation of the drum.
  • the energy supply unit is preferably completely in the laundry carrier integrated, so that the sensor arrangement can be manufactured together with the energy supply unit as a compact modular component.
  • tumble dryers also have at least one display unit, which can display information in the form of texts, images and / or characters, in color and / or black and white, statically and / or animatedly. Information and / or warnings can preferably be output to a user via the display unit.
  • the display unit is very particularly preferably an external display unit, for example the touchscreen of a smartphone or tablet PC.
  • the clothes dryer includes an evaluation unit for evaluating the sensor signals.
  • This can be arranged in the laundry carriers or at another location in the dryer.
  • the type and design of the evaluation unit are not restricted. For example, it can be part of the at least one sensor, that is, it can be implemented in it. However, it can also be an independent processor unit. In any case, the evaluation unit is set up to evaluate sensor signals and to transmit them to the control device.
  • evaluation routines are also stored in the evaluation unit and the evaluation unit is set up not only to evaluate, but also also to evaluate sensor signals measured by the sensor arrangement (s) using a target / actual comparison and / or using calibration values / curves to evaluate and only transmit to the control device when this is intended according to the evaluation. For example, if the actual value exceeds or falls below a stored setpoint.
  • the tumble dryer according to the invention preferably has an additional interface for wireless data transmission, the tumble dryer then being able to be operated preferably by means of an app using an external control unit, for example a smartphone and / or a tablet PC.
  • the laundry dryer according to the invention is then particularly preferably also integrated into a home network with at least one further household appliance.
  • the laundry driver additionally has an energy store.
  • the energy store is not restricted and can be technically implemented in any way, for example, it can be an accumulator.
  • the energy store can also be implemented, for example, in a piezo element or can also be designed independently.
  • the energy store serves to store the energy generated by the energy supply unit and, if necessary, to supply the sensor arrangement and possibly the evaluation unit etc. with electrical energy.
  • the control device can then further process the evaluation results obtained in a suitable form and / or display them to a user of the tumble dryer on a display unit which is generally present.
  • a drying program can be modified for more efficient and / or more uniform drying.
  • an end of drying can also be indicated more precisely on the display unit of the tumble dryer.
  • a fan for conveying the process air is generally present in the process air duct of a clothes dryer.
  • a blower is therefore arranged in a process air duct of the tumble dryer and the following step (c) is carried out before step (d): (c) Measuring the strength of the air flow entering the drum and taking the strength of the measured air flow into account in the evaluation in the subsequent step (d).
  • step (b) can preferably be initiated both by the control device and also independently by the sensor arrangement, without initiation by the control device.
  • the control device can thus transmit a signal for detecting sensor signals to the at least one sensor arrangement, for example, and thereby initiate step (b) of the method according to the invention.
  • a routine can also be stored in the evaluation unit to independently initiate a measurement and thereby initiate step (b) of the method according to the invention.
  • the invention has numerous advantages. Due to the location-dependent measurement of various physical properties in the drum of a tumble dryer, be it depending on the location of the laundry driver when the drum rotates or, in embodiments of the invention, additionally in the direction of the laundry driver, it is possible to optimize drying programs even better by using precise the degree of drying of the laundry items and the loading of the drum with laundry items can be closed. This information can also be conveniently transmitted wirelessly out of the drum.
  • a micromechanical sensor can be used Sensor arrangement can be designed to be particularly flexible and space-saving. A large number of different sensor types can be implemented in variable numbers in the sensor arrangement. It is also particularly advantageous that the small-scale construction of micromechanical sensors enables a large number of measurement signals to be detected for the same measurement location.
  • Figure 1 shows a vertical section through a clothes dryer according to the invention, which is designed as a condensation dryer, the arrows indicating the direction of flow of the process air.
  • a clothes dryer according to the invention, which is designed as a condensation dryer, the arrows indicating the direction of flow of the process air.
  • Other embodiments are conceivable.
  • the tumble dryer 1 shown has a drum 3, which can be rotated about a horizontal axis, for receiving items of laundry to be dried, not shown here, within which drivers 5, 22 are attached for moving items of laundry during a drum rotation.
  • the process air is guided in the process air duct 2 by means of a process air blower 6 via an air-air heat exchanger 14 and an electrical heater 4 through the drum 3. Air heated by the electric heater 4 is passed through the perforated bottom into the drum 3 through the perforated bottom through the perforated bottom through the drum entrance 19 from the rear, ie from the side of a drum 12 opposite.
  • the process air laden with moisture flows through the filling opening of the drum 3 through a fluff filter 11 inside the door 12 closing the filling opening.
  • the process air flow in the door 12 is then deflected downward through the drum outlet 18 into the process air duct 2 and routed to the air-air heat exchanger 14 through which cooling air can be conveyed in a cooling air duct 15 by means of a cooling air blower 16.
  • a more or less large part of the moisture absorbed by the process air from the laundry items condenses in the air-air heat exchanger 14 and is collected in a condensate pan 17.
  • the dryer 1 is controlled via a control device 8, which can be regulated by the user via an operating unit 7.
  • a sensor arrangement 23 each with four sensors 24, 25, 26, 27, here configured as triple sensors, and an acceleration sensor 31, a self-sufficient energy supply unit 28, and an interface 29 for wireless communication and an evaluation unit 30 for sensor signals of the sensor arrangement 23, the control device 8 and the sensor arrangement 23 being set up to communicate with one another wirelessly. Communication can take place via the interposed evaluation unit 30.
  • the triple sensors 24, 25, 26, 27 of the sensor arrangement are based on the same measuring principles (temperature, pressure, air humidity) and are arranged along the laundry drivers 5, 22.
  • the sensors 24 and 25 can also be designed as conductivity sensors, wherein an electrode 24 and a counter electrode 25 can be used. Electrode 24 and counter electrode 25 can be arranged in the same laundry carrier or on different laundry carriers.
  • the acceleration sensor 31 can be used to determine on the basis of the measured sensor signals whether a laundry driver located in a specific angular position is still in contact with or in the vicinity of laundry items.
  • two further sensors are arranged at the drum inlet and at the drum outlet in order to provide further sensor signals for an even more precise configuration of a drying program.
  • two triple sensors 9, 10, namely a triple sensor 9 at the drum outlet 18 and a triple sensor 10 at the drum inlet 19, are connected to the control device 8.
  • the triple sensors can each measure a relative air humidity, a temperature and the air pressure of the process air and thus supply important additional sensor signals, so that the residual moisture of the laundry items and in particular also a loading of the drum 3 with laundry items can be determined even better.
  • a time measuring device 20 is also present in the condensation dryer.
  • the process air blower 6 and the drum 3 are driven by the drive motor 13.
  • the drive motor 13 is a brushless DC motor (BLDC) in this embodiment.
  • a display unit 21 enables the display of a remaining running time of the drying program with regard to a residual moisture value of the items of laundry selected by the user, for example iron dry, the display of the determined load or other states of the clothes dryer or the display of the status of the drying program, for example in a differentiated form.
  • Fig. 2 shows a section of a drum, in which a laundry driver with a sensor system arranged therein is shown enlarged.
  • the section in particular a sectional view through part of a drum of the clothes dryer 1 of FIG Fig. 1 shows a laundry driver 5, 22 arranged on the drum with a sensor arrangement with an autonomous energy supply unit 28.
  • a sensor arrangement with an autonomous energy supply unit 28.
  • An acceleration sensor 31 and a triple sensor 24 are visible in this sectional view.
  • An evaluation unit 30 and a low-power Bluetooth interface 29 for wireless data transmission are also present in the laundry driver 9.22.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP19203310.8A 2018-11-13 2019-10-15 Sèche-linge pourvu de capteur d'accélération et son procédé de fonctionnement Active EP3653782B1 (fr)

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DE102018219361.4A DE102018219361A1 (de) 2018-11-13 2018-11-13 Wäschetrockner mit Beschleunigungssensor und Verfahren zu seinem Betrieb

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Also Published As

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DE102018219361A1 (de) 2020-05-14
CN111188177A (zh) 2020-05-22
CN111188177B (zh) 2023-08-25
EP3653782B1 (fr) 2024-02-21

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