EP3346049B1 - Wäschepflegegerät und verfahren zum betreiben eines solchen - Google Patents

Wäschepflegegerät und verfahren zum betreiben eines solchen Download PDF

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Publication number
EP3346049B1
EP3346049B1 EP17208886.6A EP17208886A EP3346049B1 EP 3346049 B1 EP3346049 B1 EP 3346049B1 EP 17208886 A EP17208886 A EP 17208886A EP 3346049 B1 EP3346049 B1 EP 3346049B1
Authority
EP
European Patent Office
Prior art keywords
laundry
air
laundry device
water load
control unit
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.)
Active
Application number
EP17208886.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3346049A1 (de
Inventor
Kai-Uwe Bache
Alvaro Harbach
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
Original Assignee
BSH Hausgeraete GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Priority to PL17208886T priority Critical patent/PL3346049T3/pl
Publication of EP3346049A1 publication Critical patent/EP3346049A1/de
Application granted granted Critical
Publication of EP3346049B1 publication Critical patent/EP3346049B1/de
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
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/30—Pressure
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/34—Humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/62—Stopping or disabling machine operation
    • 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
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/26—Condition of the drying air, e.g. air humidity or temperature

Definitions

  • the present invention relates to a laundry care device, in particular a clothes dryer or a washer-dryer.
  • the determination of a cut-off value is disclosed in terms of the difference between the absolute humidity on the inlet side and the outlet side of a laundry drum of a tumble dryer.
  • the difference of the absolute humidity is determined before and after the contact with the laundry. The difference automatically terminates the drying process.
  • the EP 3 255 204 A1 is relevant in relation to Art. 54 (3) EPC, and discloses a method of operating a condensation dryer with a process air duct in which process air is circulated by a blower, a heater, a drum with laundry placed therein, and a controller , wherein in the process air duct, a heat exchanger for the condensation of water from moist, warm process air and at least one humidity sensor, are arranged, wherein the method is used in particular to determine the absolute water loading of the process air.
  • the DE 10 2006 053 274 A1 discloses a clothes dryer having in an air outlet a humidity sensor connected to a controller.
  • the humidity sensor records the time course of the absolute humidity in the air outlet. Certain characteristic values, such as a time to reach a maximum value or an absolute humidity at a certain time, can be detected and compared with values stored in the controller.
  • the known systems have the disadvantage that they depend on the measurement accuracy of the sensors and these often do not work stable over the life of a laundry care device. Therefore, more often than not at the end of the service life, the inaccurate determination of the residual moisture content occurs with the result that the drying process ends too early or too late.
  • a laundry care appliance is a laundry dryer or a laundry dryer which has a dehumidifying unit which operates according to one of the principles of exhaust air drying, condensation drying or heat pump drying.
  • the determination of the moisture content of the laundry is independent of the measuring accuracy of the sensors and independent of the drift of measured values over the life of the sensor. From measured values of the temperature, the relative humidity and the water load of the process air of a dryer resulting from these quantities, the degree of dryness of the laundry can be deduced.
  • the control unit is e.g. an arithmetic unit with data storage function, in particular, it can be integrated into an existing device control of the laundry care device, both as a software component and as a hardware component. Alternatively, the control unit can also be arranged outside the laundry care appliance and connected to it via the Internet.
  • the air circuit includes several components in the laundry care device.
  • the air cycle starts in the dehumidifying unit. From the dehumidifying unit, the process air is passed into an air duct, which connects the dehumidifying unit and the laundry drum, which is called the inlet-side air duct. From the laundry drum, a second air duct leads into the dehumidifying unit, which is called the outlet-side air duct.
  • the arrangement of the dehumidifying unit, the laundry drum and the air ducts an air circuit is formed.
  • the detection unit is simply or repeatedly positioned in the air circuit. Individual sensors can also be arranged in the air circuit.
  • the detection unit is preferably located in the outlet-side air duct.
  • the relative humidity in the outlet air duct can be up to 100%.
  • the detection unit of the laundry care device additionally contains an air pressure sensor.
  • the air pressure sensor can measure the ambient pressure in the air circuit and forward it to the control unit.
  • control unit operates at a predetermined, e.g. factory default, standard air pressure.
  • the moisture sensor, the temperature sensor and the air pressure sensor are designed as a single component in a so-called triple sensor.
  • the sensors for detecting the relative humidity, the temperature and the air pressure can also be spatially separated from each other.
  • the maximum distance of the sensors from each other preferably not more than 10 cm, in particular not more than 5 cm.
  • the detection unit measures the current air temperature, relative humidity and optionally the air pressure in the air circuit preferably at least every 5 minutes, in particular with a sampling rate of 1-6000 min -1 , preferably of 10-200 min -1 .
  • the control unit smoothes the acquired measured values over time, which is preferably achieved using the moving average method.
  • the detection unit begins to measure with the start of the laundry care process and stops the measurement with the end of the laundry process, which is determined by the achievement of the Abschaltwerts.
  • the switch-off value is in preferred embodiments dependent on the load, the initial residual moisture, the type of textile and / or the construction of the laundry care appliance.
  • the load corresponds to the amount of laundry in the laundry drum (I.D. measured in kg), while the initial residual moisture of the laundry (i.e., the water content in%) depends on the types of textiles.
  • the influencing variables of the cut-off value can be derived from the different signal characteristics.
  • the loading is determined from the time of occurrence of the maximum of the water load. The earlier the maximum occurs, the lower the load. For example, the maximum load of water at a load of 4kg occurs after about 60 minutes and at a load of 8kg after about 90 minutes.
  • the initial moisture content describes the moisture of the laundry before the start of the laundry care process.
  • the initial moisture content is highly dependent on the type of textiles. For example, a cotton laundry may absorb more water than one Synthetic laundry.
  • the structure of the laundry care device may possibly also affect the shutdown, since the laundry drum size, the dehumidifying unit and the leadership of the air cycle influence the laundry drying process and thus on the height and the time of the maximum of the water load and thus on the Abschaltwert.
  • the saturation vapor pressure of the water as a function of the temperature describes the pressure at which the gaseous state of matter is in equilibrium with the liquid or solid state of matter. This is stored as a function of the temperature in the control unit, for example in the form of a table, as are the values for M W and M L.
  • the smoothed relative humidity and air pressure readings are used, but it is also possible to first calculate the water load from the unsmoothed readings and then smooth the water load.
  • the water load behaves in a typical pattern.
  • the water loading of the process air during a heating phase increases continuously on.
  • the water load remains at a high level for a long time.
  • the time window or the duration of the high level is dependent on how high the initial residual moisture is at the beginning of the laundry care process. For example. When loading with cotton textiles only, the time window will be longer than when loaded with only synthetic textiles.
  • the water loading of the process air decreases again. During the high level of water loading, the maximum of water loading is determined.
  • the control unit monitors all measured values of the sensors and calculates characteristic values from the measured values, for example the current water load of the process air, the maximum of the water load and the time of the maximum of the water load.
  • the control unit determines the maximum of the water load, for example, in which it remembers the hitherto highest value, and for a predetermined period of time, e.g. 1 to 20 minutes, in particular 2 to 15 minutes, preferably 5 to 10 minutes, after the measurement of this previous maximum value checks whether an even higher value is measured within this period. If so, it is assumed that this new maximum value and again wait for the predetermined period, if an even higher value is measured. Should no new maximum value be determined during this period, then the control unit determines the previous maximum value as the maximum of the drying process.
  • a predetermined period of time e.g. 1 to 20 minutes, in particular 2 to 15 minutes, preferably 5 to 10 minutes
  • the water load could also be averaged over a just past period and be determined for each newly measured value, whether it is above or below the average. Further mathematical methods for determining the maximum are conceivable.
  • the shutdown value is calculated from the maximum of the water load in which a certain difference is subtracted. That is, when the water load has fallen after exceeding the maximum by this difference, the drying process is terminated.
  • the difference may be a fixed, factory predetermined value.
  • the difference is preferably a relative value which is determined on the basis of further characteristic values / influencing variables, and which depends in particular on the loading of the laundry care device and / or the initial residual moisture, the type of textile and / or the structure of the laundry care device.
  • the control unit determines in advantageous embodiments the time of occurrence of the maximum of the water load. From this, the loading of the laundry care appliance can be derived, in particular based on a predetermined value table stored in the control unit. From the thus determined value of the load, the difference can be calculated or determined by means of another value table. For example, the larger the difference, the greater the difference. Alternatively, the difference can also be determined or calculated directly from the time of the maximum of the water load. Other values that may be taken into account in the calculation or determination (e.g., of value tables stored in the control unit) of the difference are the height of the maximum of the water load, and in particular the above-mentioned. Duration of high level of water loading.
  • the difference is subtracted from the maximum of the water load.
  • the result of the subtraction is the shutdown value.
  • the achievement of the shutdown value triggers the termination of the laundry care process ended.
  • the invention is also directed to a method of operating a laundry care device.
  • the method preferably relates to a laundry care device as has been explained in the previous description.
  • all features described with respect to the laundry care appliance are also applicable to the process and vice versa.
  • the process supports and optimizes the implementation of a laundry care process. Therefore, all process steps can be performed simultaneously or multiple times.
  • the relative humidity and the temperature are measured, for example, with the sampling rate described above, wherein the air pressure is predetermined or even measured.
  • the water load in the air circuit is determined from the recorded measured values.
  • the drying process is in a stationary state.
  • a maximum of water loading is formed over time. This maximum is determined and used to determine the cut-off value.
  • the shutdown value results from a predetermined relative ratio or a difference to the maximum of the water load.
  • the laundry care process is also ended.
  • FIG. 1 shows a schematic section through an embodiment of the laundry care device 2, which has an opening 4, through which the laundry can be filled in the laundry drum 8.
  • the laundry drum 8 has a process air outlet 6 and a process air inlet 7.
  • the laundry care appliance has a dehumidification unit 14.
  • the outlet-side process air duct 18 connects the process air outlet 6 with the dehumidification unit 14.
  • the inlet-side process air duct 16 connects the dehumidifier unit 14 with the process air inlet 7.
  • the outlet-side process air duct know an outlet side arranged detection unit 10, which is connected via a cable or wirelessly connected to the control unit 12, so that measurement data can be transmitted.
  • FIG. 2 shows a schematic section through another embodiment of the laundry machine 2.
  • the inlet-side process air channel 16 connects the dehumidifying unit 14 with the process air inlet 7.
  • the detection unit 11 is located in the inlet-side process air channel 16.
  • FIG. 3 shows a schematic section through the embodiment of the laundry care device 2 of Fig. 2
  • the laundry drum 8, the process air inlet 7, the process air outlet 6, the dehumidifying unit 14, the inlet-side process air channel and the outlet-side process air channel 18 form an air circuit 17.
  • the air circuit 17 shows the guidance of the process air through the laundry care device 2.
  • FIG. 4 shows a graph 20 of air temperature 26, water load 28, and relative humidity 34 over time.
  • the chart 20 has two axes, a tri-headed Y-axis 22, which documents the temperature in degrees, the relative humidity in percent, and the water load in grams per kilogram.
  • the second axis is an X-axis 24 which describes the time in minutes of the laundry process.
  • the course of the air temperature 26 (short dashed line) over the total time of the laundry care process can be divided into three temporally successive parts.
  • the first part begins with the start of the laundry care process and ends after about 60 minutes after the start of the laundry care process. In the first part, the air temperature is rising almost constantly.
  • the second part starts after about 60 minutes after the start of the laundry care process and ends after about 90 minutes after the start of the laundry care process. In the second part, the air temperature remains at a nearly constant high level.
  • the third part of the course of the air temperature covers the time from about 90 minutes after the start of the laundry care process to the end of the laundry care process. In the third part, the air temperature 26 rises slightly.
  • the course of the relative humidity 34 (solid line) is divided into two parts.
  • the first part of the course of the relative humidity 34 extends between the start of the laundry care process and the time approximately 60 minutes after the start of the laundry care process.
  • the course of the relative humidity in the first part is characterized by a high Y value already at the start of the laundry care process. Up to a time about 10 after the start of the laundry care process, the relative humidity 34 increases very strongly. From the time approximately 10 minutes after the start of the laundry care process, the relative humidity 34 remains at a consistently high level.
  • the second part of the course of the relative humidity 34 is characterized by an approximately linear drop until the end of the laundry treatment process.
  • the course of the water load 28 (long dashed line) is also divided into three temporally successive parts.
  • the first part describes the course between the start of the laundry care process and the time between the 50th and the 60th minute of the laundry care process. In the first part, the water loading 28 increases.
  • the second part of the course of the water load 28 extends between the time between the 50th and 60th minute and the approximately 90th minute.
  • the course of the water loading 28 in the second part is almost constant at a high level.
  • the third part of the course of the water loading 28 is between the approx. 90th minute of the laundry care process and the end of the laundry care process. In the third part of the course of the water loading 28, the water loading 28 decreases almost constantly.
  • the end of the laundry care process is defined by the shutdown value 30.
  • the shutdown value 30 is determined by the control unit 12 during the laundry care process.
  • a maximum 36 of the water load 28 in the course of the water load 28 is determined.
  • the maximum 36 of the water load 28 occurs in a time window 38.
  • the time window 38 describes a stationary phase of the course of the water load 28, wherein the water load 28 is at a constant high level.
  • the control unit 12 calculates a difference 32 from the maximum 36 of the water load, for example, by using a value table.
  • the difference 32 can be seen in the diagram 20 and describes the distance between the maximum 36 of the water load and the switch-off value 30 in the diagram 20.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP17208886.6A 2017-01-09 2017-12-20 Wäschepflegegerät und verfahren zum betreiben eines solchen Active EP3346049B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17208886T PL3346049T3 (pl) 2017-01-09 2017-12-20 Urządzenie do pielęgnacji prania i sposób jego eksploatacji

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017200174.7A DE102017200174A1 (de) 2017-01-09 2017-01-09 Wäschepflegegerät und Verfahren zum Betreiben eines solchen

Publications (2)

Publication Number Publication Date
EP3346049A1 EP3346049A1 (de) 2018-07-11
EP3346049B1 true EP3346049B1 (de) 2019-11-13

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EP17208886.6A Active EP3346049B1 (de) 2017-01-09 2017-12-20 Wäschepflegegerät und verfahren zum betreiben eines solchen

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EP (1) EP3346049B1 (pl)
DE (1) DE102017200174A1 (pl)
PL (1) PL3346049T3 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
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US12442121B2 (en) 2023-08-03 2025-10-14 Haier Us Appliance Solutions, Inc. Laundry machine and method for operation

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Publication number Priority date Publication date Assignee Title
CN116815484A (zh) * 2023-06-19 2023-09-29 广东好太太科技集团股份有限公司 衣物烘干控制方法、系统、存储介质及衣物护理设备

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JP2002066196A (ja) 2000-08-25 2002-03-05 Matsushita Electric Ind Co Ltd 衣類乾燥機
US20030034443A1 (en) * 2001-01-12 2003-02-20 Kouznetsov Andrian I. Absolute humidity sensor to control drying equipment
US9249539B2 (en) * 2006-09-25 2016-02-02 Ecolab Inc. Determination of dryness of textiles in a dryer
DE102006053274A1 (de) 2006-11-06 2008-05-08 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Ermitteln der Ladungsmenge in einem Wäschetrockner und Wäschetrockner
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Publication number Priority date Publication date Assignee Title
US12442121B2 (en) 2023-08-03 2025-10-14 Haier Us Appliance Solutions, Inc. Laundry machine and method for operation

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EP3346049A1 (de) 2018-07-11
PL3346049T3 (pl) 2020-05-18
DE102017200174A1 (de) 2018-07-12

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