EP3683344B1 - Verfahren zum schleudern von wäsche, steuervorrichtung für ein wäschebehandlungsgerät, wäschebehandlungsgerät und computerprogramm - Google Patents

Verfahren zum schleudern von wäsche, steuervorrichtung für ein wäschebehandlungsgerät, wäschebehandlungsgerät und computerprogramm Download PDF

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Publication number
EP3683344B1
EP3683344B1 EP20150441.2A EP20150441A EP3683344B1 EP 3683344 B1 EP3683344 B1 EP 3683344B1 EP 20150441 A EP20150441 A EP 20150441A EP 3683344 B1 EP3683344 B1 EP 3683344B1
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EP
European Patent Office
Prior art keywords
drain pump
spin
laundry
speed
drum
Prior art date
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Active
Application number
EP20150441.2A
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German (de)
English (en)
French (fr)
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EP3683344A1 (de
Inventor
Katrin Peisert
Stefan Wetzel
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
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Publication of EP3683344A1 publication Critical patent/EP3683344A1/de
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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
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/007—Methods for washing, rinsing or spin-drying for spin-drying only
    • 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
    • D06F23/00—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 
    • D06F23/02—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 rotating or oscillating 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
    • 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
    • D06F2103/42—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to filters or pumps
    • 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
    • D06F2105/12—Humidity or dryness of laundry
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/40—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of centrifugal separation of water from the laundry
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/50—Control of washer-dryers characterised by the purpose or target of the control
    • D06F33/52—Control of the operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/60—Control of the operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of centrifugal separation of water from the laundry
    • 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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps

Definitions

  • the present invention relates to a method for spinning laundry, a control device for a laundry treatment appliance, a laundry treatment appliance and a computer program for carrying out the method steps.
  • a spin process in a laundry treatment appliance that serves to dewater laundry has hitherto been specified as a fixed speed profile (spin profile) of a drum of the laundry treatment appliance via a program control.
  • This speed profile is currently being influenced during its execution, in particular by methods for imbalance control, as a result of which a redistribution of the laundry, a speed limitation and/or spin terminations are triggered.
  • a suds pump arranged in a current laundry treatment appliance which pumps fluid (in particular a mixture of water, foam and laundry treatment agent) out of a suds container arranged in the laundry treatment appliance, runs continuously at a constant speed during the spinning process.
  • a specified spin profile is typically designed with a very absorbent load (laundry) so that the exiting fluid can also be pumped out in such a case.
  • the operating state of the drain pump is oversized compared to the fluid release rate.
  • a predefined speed curve has the disadvantage that depending on the respective water retention capacity of the laundry, a target residual moisture content is reached at different rates. Accordingly, it can happen that laundry is spun either too long or too short.
  • a pump device for a water-conducting household appliance in particular for a washing machine, is known, the pump device being a drain pump, a power stage connected to the drain pump, at least one detection unit which is used to detect at least one electronic parameter of the drain pump, and a control unit which controls the drain pump controls via the power level includes.
  • the control unit evaluates the electrical parameters detected by the detection unit and influences the control of the drain pump depending on the result of the evaluation.
  • the DE 3825502 A1 discloses a washing machine in which a flow sensor is fitted on a delivery side of a drain pump. The signals from the flow sensor are fed to an electronic circuit as input signals. Based on an actual setpoint comparison, a drive motor of the drain pump is switched off and on several times for a short period of time until a predetermined minimum waste water flow rate is exceeded.
  • a method for detecting the load state of a fluid-supplying pump, driven by an electric motor, of a household appliance is known.
  • the pump is driven by a permanently excited electric motor designed as a synchronous motor, at least one load state of the pump being determined from a torque-forming current component.
  • EP 2 754 743 A1 reveals a washing machine.
  • EP 2 463 431 A2 discloses a method and apparatus for monitoring a property of a motor of a washing machine.
  • the present invention is based on the object of proposing a method for spinning laundry, a control device for a laundry treatment appliance, a laundry treatment appliance and a computer program for carrying out the method steps, in which the service life of the laundry treatment appliance is increased, noise and vibration emissions are reduced, the energy efficiency of the laundry treatment device is increased and at the same time the laundry is protected.
  • the task by a method for spinning laundry having the features of claim 1, a control device for a laundry treatment appliance having the features of claim 11, a laundry treatment appliance having the features of claim 12 and a computer program having the features of claim 13.
  • a method for spinning laundry with the aim of dewatering the laundry with a laundry treatment appliance having: a drum for holding laundry, a tub in which the drum is rotatably accommodated, and a drain pump which is designed for this purpose, in particular by to promote the centrifuging released fluid from the tub, a continuous measurement of a flow rate of the tub pump.
  • the laundry treatment appliance can be a washing machine or a washer-dryer, for example.
  • the drum is preferably rotatably accommodated in the tub and can be driven by a drive unit.
  • the drain pump can be a centrifugal pump, in particular a radial pump, semi-axial pump or axial pump.
  • the drain pump can have a pressure housing in which a suction chamber is arranged on a suction side and a discharge chamber is arranged on a delivery side.
  • the drain pump is preferably arranged as far down as possible in the laundry treatment appliance, so that the pressure in the suction chamber is as high as possible.
  • the drain pump is preferably designed to pump the fluid from the tub to a desired dispensing level of the laundry treatment appliance.
  • the drain pump can also be used to convey the fluid located in the tub during a washing program in order to supply it to the tub again.
  • the fluid is in particular a mixture of water, laundry treatment agent and enclosed air (foam), which is also referred to as liquor or lye.
  • the continuous measurement means in particular that the flow rate is measured repeatedly, preferably the flow rate is measured every second.
  • the delivery flow can be a flow rate per unit of time and can in particular be detected by at least one sensor.
  • the delivery flow can be measured, for example, by means of an electrical parameter of the drain pump and/or with a flow sensor.
  • the method also includes a first plateau spin, in which a spin speed of the drum is kept constant above an oscillating system resonance frequency range and the drain pump is operated in a plateau spin operating mode adapted to the first plateau spin, and an increased spin, which starts depending on the flow rate of the drain pump becomes.
  • the drum can rotate at a constant speed, which means that the speed of the drum does not change over time.
  • the speed of the drum can be measured continuously by at least one sensor and the drive unit for driving the drum can be operated based in particular on the measurement result.
  • the drum rotates at a speed that is greater than 400 rpm.
  • the speed for the first plateau spin can be selected in such a way that a certain distance from the resonance range is maintained.
  • the resonance range can be continuously determined by measurement results from acceleration sensors, which measure the vibration behavior of the vibration system, in particular the drum, during the first plateau spin. Based on this measurement, the speed during the first plateau spin can be controlled and adjusted to a changing resonance range. For the first plateau spin, it is desirable to have the RPM as close to the resonance range as possible.
  • the resonant frequency is the frequency at which the oscillating system has an increased oscillation deflection, so that oscillations can also be transmitted to the other components of the laundry treatment appliance.
  • the oscillating system can be composed in particular of the drum, the laundry accommodated therein and other components which move when the drum rotates.
  • the vibration is determined in particular by the mass of the oscillating system, an imbalance in the oscillating system and a spring constant of a damping system (for example a spring system) with which the oscillating system is held.
  • the resonant frequency is dependent in particular on the weight of the oscillating system. Since the weight of the laundry depends on whether it is wet or dry, it also changes Resonance frequency of the oscillating system accordingly.
  • the oscillating system resonant frequency range lies between two resonant frequencies, in particular between the resonant frequency that occurs when the laundry is wet (ie saturated with water, for example) and the resonant frequency that occurs when the laundry is dry.
  • the weight of the laundry can be measured, for example, using scales, a measured lowering of the oscillating system, or special drum rotation processes at the beginning of the washing program.
  • the amount of water supplied (mass of water) can be known depending on the program and/or can be measured by sensors in the inlet and/or in the tub.
  • the resonant frequency can depend in particular on the spring constant of the damping system.
  • the resonance frequency range is between 80 and 350 revolutions/min. In the case of the laundry treatment appliance, above the resonant frequency range, increased foam formation in the tub is to be expected due to the increased speed of the drum, since the rotational movement and the resulting draft at the interface between the fluid and the air causes more foam to form.
  • the operating mode of the drain pump can be defined in particular by electrically controlled properties of the drain pump, in particular the drain pump can work in the operating mode that is adapted to the first plateau spinning, in particular with a suction pressure in the suction chamber, so that heavily foamed fluid (i.e. fluid with a high level of contained air content, two-phase fluid) can be reliably promoted from the tub.
  • the drain pump can have a symmetrical impeller which is arranged in the pressure housing between the suction side and the delivery side. Furthermore, a discharge port on the delivery side can be connected tangentially to the pressure casing, so that the pressure casing is asymmetrical.
  • the drain pump preferably has a speed of 2500 revolutions/min.
  • the increase centrifuging has an initial speed increase of the drum, and a subsequent speed increase started depending on the flow rate of the drain pump, which is adjusted at least once above the oscillating system resonance frequency range depending on the flow rate so that the drain pump does not run dry and no impermissible backwater of fluid in the tub, with the speed increase of the drum being increased when the flow rate decreases and the speed increase of the drum being maintained the same or reduced when the flow rate of the drain pump increases.
  • the initial speed slope means the speed slope at the beginning of the boost spin.
  • the subsequent speed increase occurs above the vibratory system resonant frequency range, which means that the speed does not enter or drop below the vibratory system resonant frequency range during the ramp-up spin. Adjusted at least once means that the speed of the drum can also be adjusted several times.
  • the speed can be adjusted every 1s to 5s depending on the flow rate of the drain pump, preferably every 3s. In other words, the speed increase is maintained for a time between 1 s and 5 s, preferably for 3 s.
  • Running dry means in particular that there is not enough fluid available on the suction side of the drain pump so that air can be sucked in in addition to the fluid.
  • Impermissible back pressure means in particular that the flow rate of the drain pump is not high enough and as a result more fluid is added to the tub (e.g. by spinning wet laundry) than is removed by the drain pump and the water level in the tub rises to such an extent that the rotating drum overflows Backwater (fluid) travels with it and foams as a result.
  • Adjusting the speed increase of the drum means that the speed of the drum is changed in such a way that the drain pump does not run dry and no impermissible backflow occurs.
  • the increase in speed can also be adapted to the option selected at the beginning of a washing program, so that a maximum speed can be quickly reached, for example, in a speed program, while in delicate laundry programs an adjustment to gentle laundry requirements can take place.
  • the speed of the drum can also be reduced when the drain pump with at maximum power to ensure that the fluid in the tub can be reliably pumped out.
  • the drum speed can be controlled synchronously with the operation of the drain pump, whereby the centrifugal block can be shortened, since the increase in the speed of the drum can be continuously adapted (synchronized) to the flow rate of the drain pump.
  • it can ensure an extension of the device life and a minimization of noise and vibration.
  • the washing program executed in the laundry treatment appliance can be shortened and the energy efficiency of the laundry treatment appliance can be increased.
  • the initial residual moisture can be determined at the end of the wash program and at the beginning of the spin program.
  • the current residual moisture can be determined continuously, ie continuously.
  • the mass of the dry laundry can be measured at the beginning of the washing program, for example using a scale.
  • the mass of the wet laundry can be measured at specific points in time or also continuously in the same way or in a different way, and the mass of the water absorbed in the laundry can be determined therefrom.
  • the mass of the water that is supplied to the washing process during washing, in particular during the wetting phase can additionally or alternatively be determined continuously on the basis of the inflow.
  • the inflow can be measured by a flow sensor, for example.
  • the parameter matrix outputs the increase in speed based on the relation between the initial residual moisture content and the fluid volume pumped off in the first plateau centrifuge or based on the current residual moisture content.
  • the continuous measurement preferably takes place at intervals of one second each.
  • the pumping rate of the drain pump refers to the delivery rate of the drain pump, i.e. the flow rate per unit of time.
  • the time integral can be placed over the individual measured conveying flows. In other words, all delivery flows measured up to that point in time at any point in time (e.g. every second) are multiplied over time and added up.
  • the fluid release rate refers to the amount of fluid from the system consisting in particular of the drum and the laundry received therein is released in particular by the rotation of the drum.
  • the method includes a pre-spin before the first plateau spin, in which the speed of the drum is at least a predefined speed below the oscillating system resonance frequency range, the pre-spin depending on the flow rate of the drain pump is started and ended.
  • the speed of the drum during the pre-spin cycle is less than 100 revolutions/min.
  • the speed during pre-spin can be selected so that a certain distance from the resonance range is maintained. This distance is preferably 10% from the lower limit of the resonant frequency range.
  • the resonance range can be determined continuously by measuring results from acceleration sensors, which measure the vibration behavior of the drum in particular, during the pre-spin.
  • the speed can be controlled during pre-extraction and adapted to a changing resonance range. Furthermore, an imbalance measurement can be carried out before and/or after and/or parallel to the pre-spin.
  • an imbalance measurement can be carried out before and/or after and/or parallel to the pre-spin.
  • the pre-spin cycle can be started when the drain pump was started while the drum was at a standstill or during a reversing rhythm and the flow rate of the drain pump fell below a predetermined level. In principle, it is desirable to release as much water as possible from the laundry during the pre-spin cycle. Preferably, therefore, the pre-spin is only ended when a certain flow rate of the drain pump is undershot.
  • the feed pump is operated during the pre-spin in a pre-spin operating mode that is adapted to the pre-spin and differs from the plateau spin operating mode.
  • the operating mode of the drain pump can be adapted to this, so that the drain pump can work particularly efficiently, for example.
  • the drain pump can be operated in the pre-spin operating mode in such a way that it works with its greatest efficiency.
  • the drain pump preferably has a speed of 2500 rpm. As a result, the fluid can be reliably conveyed out of the tub without an impermissible backwater forming. At the same time, energy efficiency can be increased.
  • the method comprises a second plateau spin, in which the speed of the drum corresponds to a maximum speed of a program set in the laundry treatment appliance, the second plateau spin beginning when the boost spin has reached the maximum speed and ending when a target residual moisture content or a maximum Spin duration than a target value is reached.
  • the maximum speed can correspond to the speed selected by the user and/or the maximum speed stored in the respective washing program.
  • the maximum maximum speed is preferably 1900 rpm.
  • the drain pump can be put into a venting and/or pause mode once and/or several times. This can happen, for example, if the flow rate of the drain pump falls below a certain value.
  • the drum can be braked (ie when the target value is reached) in order to quickly pass through the resonance range.
  • the target residual moisture can also be calculated using the above equations. In particular, it can be determined as a function of the program and options selected by the user at the beginning of the washing program.
  • the spin duration for the second plateau spin can be determined as a function of the amount of fluid released during the previous spin using a calculation model, with the amount of fluid released being measured at at least one measuring point, in particular by means of at least one level sensor that measures the level (i.e. the water level) in the tub measures.
  • the calculation model can take into account the fluid discharged by the drain pump and the amount of fluid in the tub, which can be determined via the pressure measured at the at least one measuring point, and thus continuously determine how long the second plateau spin cycle lasts must in order to achieve the target residual moisture.
  • the at least one filling level sensor can be a pressure sensor which communicates with the interior of the tub, preferably in such a way that the pressure sensor can measure the pressure in the tub at the lowest possible position. Consequently, the process accuracy as well as the process reliability can be increased.
  • the target residual moisture can be determined and/or specified as a function of the program set in the laundry treatment appliance, and the target residual moisture can additionally or alternatively be checked by a target flow rate of the drain pump, with the target residual moisture only being considered to have been reached when the target flow rate of the drain pump has a minimum average flow rate reached.
  • the current flow rate of the drain pump can also be used to check the calculated and determined target residual moisture by comparing whether the flow rate of the drain pump has also reached a minimum mean flow rate as soon as the target residual moisture is reached according to the calculation, with the minimum mean flow rate in Depending on the selected washing program or option can be predetermined.
  • the various methods for determining the spin duration be combined.
  • a stored laundry residual moisture calculation model can be used to calculate the spin duration to achieve the target residual moisture content, which, for example, uses an algorithm to identify dry loads, a water retention capacity forecast (using an appropriate method), the amount of water let in, the target speed, the entire speed profile and parameters to take the drum geometry into account can calculate an optimal spin profile, in particular the corresponding spin duration.
  • the method comprises at least venting the drain pump, in which the drain pump is vented passively or actively, with the venting being started as a function of the delivery flow and lasting for a predetermined time.
  • passive venting the drain pump can be switched off and you can wait until the air in it has risen back into the tub.
  • the passive venting lasts preferably 30s.
  • active venting the drain pump can continue to be operated so that the air in it flows through the pump is transported away, in particular air can be transported away from the intake chamber through the drain pump to the delivery side by adjusting the speed of the drain pump.
  • the active venting preferably lasts for 5s to 10s.
  • a venting process is preferably carried out during the process between the pre-spin and the first plateau spin and/or between the first plateau spin and the increase in spin. In this way, an optimal functionality of the drain pump can be ensured and unnecessary downtimes of the drain pump can be avoided while the speed of the drum is increasing.
  • the delivery flow delivered by the drain pump is measured via a pump torque of the drain pump.
  • the sensor can be coupled directly or indirectly to the drain pump.
  • several sensors can be provided in order to provide a redundant system so that measurement data can still be supplied even if one sensor fails. Measuring the delivery flow via the drain pump torque has the advantage that air that is pumped through the drain pump is not measured as it does not contribute to the pump torque. Consequently, the flow rate of the drain pump can be reliably measured.
  • the operating mode of the drain pump is defined in particular by its pump speed and/or its direction of rotation.
  • the drain pump can be configured such that when an impeller of the drain pump rotates clockwise, it is configured to efficiently pump fluid with a low air content. Conversely, when the drain pump's impeller rotates counter-clockwise, it can be configured to pump fluid with a high aerated content (ie, two-phase fluid) efficiently. This can be accomplished, for example, by a corresponding geometric configuration of the impeller and/or the pressure housing of the drain pump. Furthermore, this effect can be achieved alternatively or additionally by an adjusted speed of the impeller of the drain pump.
  • the drain pump can be optimally adapted to the respective operating environment (rotational speed of the drum or process step during the process), ie to the amount of fluid produced and its condition be assured.
  • the capacities of the drain pump can be optimally utilized, as a result of which the energy efficiency of the laundry treatment appliance can be increased.
  • a control device for a laundry treatment appliance is designed to control the laundry treatment appliance in such a way that the method steps are carried out in accordance with the method.
  • the control device can control the rotational speed of the drum, the operating mode of the drain pump and the water supply based on the measurement results of the aforementioned sensors.
  • the control device can include a computer, in particular a CPU.
  • a laundry treating appliance is comprised of: a drum for accommodating laundry, a tub in which the drum is rotatably received, a drain pump configured to pump fluid from the tub, and the above control device.
  • a computer program with program code which is stored on a machine-readable carrier, is used to carry out all method steps according to the above method when the computer program is executed in a control device.
  • washing machine 1 shows a washing machine 1 according to an embodiment of the present invention with a tub 2.
  • a drum is rotatably accommodated.
  • the drum is driven by a drive unit, not shown, to be able to rotate in different directions during a washing program and to rotate at an increased speed during a spin program.
  • the washing machine 1 has an interface with which a user can select and set washing programs and/or washing options.
  • a control device (not shown) is arranged in the washing machine 1, which processes the entered user commands, records, stores and further processes measurement data from sensors arranged in the washing machine 1 and outputs commands for controlling the washing machine.
  • a drain pump (not shown) is arranged in the washing machine at the lowest possible point, which pumps fluid out of the tub 2 during operation.
  • FIG. 2 shows three diagrams, the first diagram representing a rotational speed of the drum, the second diagram representing a flow rate of the drain pump and the third diagram representing residual moisture in the laundry over time.
  • the user makes a program and/or option selection 10 which influences a target speed 30 of the drum.
  • a target residual moisture content 31 is also determined based on this input.
  • the target residual moisture content 31 is higher for delicates textiles than for cotton textiles, for example, due to a desired gentleness on the laundry.
  • a load detection 11 is then carried out in order to detect the dry matter 32 of the laundry accommodated in the drum.
  • water is supplied to the tub and a quantity of water 33 is determined via a flow meter and/or a pressure limiter.
  • the mains phase 12 is carried out before the load detection 11 .
  • a wet mass 34 of the laundry is then obtained with the load detection 11 .
  • the load detection 11 can be carried out both before the mains phase 12 and afterwards.
  • an expected resonance speed 36 (ie the resonance frequency) is determined via a parameter set in the control device. Since a different resonance speed 36 is set for the oscillating system with dry laundry than for the oscillating system with wet laundry, between these two Resonance speeds 36 formed the resonance speed range (see 2 , the area between the two horizontal dashed lines).
  • the drum is rotated in a reversing rhythm alternately in one direction and in the other direction (see 2 ).
  • a main or post-wash phase 13 based on the wash program that has been set.
  • the drainage process begins when the drum is at a standstill or in a reversing rhythm, with the fluid in the tub 2 being pumped out by the drain pump.
  • the drain pump is operated in a pre-spin operating mode 14 .
  • the drain pump is set in such a way that it can pump fluid with a low proportion of air (single-phase fluid) efficiently, i.e. with the highest efficiency of the drain pump.
  • a pump torque 37 of the drain pump measured by a sensor is used to calculate the flow rate 52 in order to obtain the flow rate 38 of the drain pump.
  • control device continuously calculates a delivered volume of the fluid (i.e. the total amount of water delivered from the tub) from the delivery flow of the tub via time integration.
  • the control device calculates a current residual moisture 39 (i.e. the residual moisture of the laundry at a specific point in time) during a residual moisture calculation 53 using the starting residual moisture 35 . If during the pumping-out process of the drain pump a predefined flow rate is not reached, it is concluded that the fluid in the tub 2 has been pumped out, and the pre-spin 15, which is carried out below the oscillating system resonance frequency range, is started. In other words, the pre-spin cycle 15 is not started until a predetermined amount of fluid has been pumped out of the outer tub 2 .
  • a system vibration 40 is measured parallel to the pre-slinging 15 .
  • An imbalance 41 of the oscillating system is thus calculated in an imbalance calculation 54 and a decision is made as to whether a redistribution of laundry 16 in the drum must be carried out. If a laundry redistribution 16 has to be carried out, the control device reduces the speed of the drum during this Pre-spin 15 so that the laundry is rearranged in the drum. This process is repeated until the imbalance 41 is within a preset desired range.
  • the drain pump is briefly put into a venting process 23 .
  • the pump is switched off so that the air in it can rise back into the tub 2 (passive venting).
  • the speed of the drain pump is changed during the venting process 23 such that the air in the drain pump is transported away by the drain pump (active venting).
  • the speed of the drum is then increased in such a way that a resonance passage 17 takes place and the drum reaches a speed of a first spin plateau 18 .
  • the resonant frequency range is rushed through as quickly as possible.
  • the venting process 23 of the drain pump it is activated in a plateau spin operating mode 22 .
  • the plateau spin operating mode 22 is adapted to the increased air content in the fluid (two-phase fluid) during the first plateau spin 18 so that the two-phase fluid can also be reliably removed from the tub 2 . This is ensured by changing the direction of rotation of an impeller of the drain pump and adjusting the speed of the impeller of the drain pump.
  • the rotational speed of the drum during the first plateau spinning 18 is selected in such a way that it is as close as possible to the resonant frequency range so that an excessive amount of fluid is not released but the resonant frequency range is nevertheless avoided.
  • the oscillating system movement, the fluid release rate of the drum and the operating mode of the drain pump are coordinated with one another (synchronized with one another, see 3 the three dashed lines without an arrow).
  • the drain pump performs the venting process 23 again.
  • the first plateau spin 18 is terminated after the flow rate of the drain pump again falls below a predefined level. A renewed venting process 23 of the drain pump is then carried out. After the first plateau spin 18, an increase spin begins 19.
  • the first speed increase of the drum is selected using a parameter matrix so that the fluid release rate of the drum then corresponds as closely as possible to the pumping rate of the drain pump.
  • the drain pump is operated in an operating mode (speed-adapted, direction-adapted) in which it can reliably convey the two-phase fluid.
  • the speed increase 42 is continuously determined by the control device in a speed increase setting 55 .
  • the speed gradient 42 of the drum can be varied several times based on the flow rate of the tub pump, so that the pump does not run dry, but also no unacceptable backwater of fluid in the tub arises.
  • the speed increase 42 of the drum is also adapted to the program and option selection previously entered by the user, so that the target speed 30 is quickly reached in accordance with the set program. In addition, for example, in a delicates program, there is an adjustment to the washing gentleness requirement.
  • a second plateau spin cycle 20 begins, which is maintained until the target residual moisture content 31 is reached or a maximum spin time is reached.
  • the drain pump may be put into the venting state 23 several times or into a pause mode. This means that if the flow rate of the drain pump drops too quickly or too much, for example because the drum speed cannot be increased quickly enough to provide enough fluid, the drain pump is switched to pause mode. If the target residual moisture content 31 is reached, the drum is braked 21 in order to quickly rush through the resonance range 17 again.
  • spin profile is stored in the control device, which serves as the maximum permissible speed curve (spin profile) over time in order to form a worst-case scenario if synchronization cannot be achieved with the iterative procedure described above.
  • This spin profile is activated if the spin process lasts too long without reaching the target residual moisture content 31 and/or the target speed 30 .
  • the washing machine allows for loading laundry that is already damp.
  • the load detection would overestimate the dry mass, while less water can be introduced into the mesh phase 12, as if there were a larger quantity of laundry with less absorbency in the drum than is actually the case.
  • the target residual moisture 31 would already be reached via the residual moisture calculation 53, although the laundry has not yet reached the desired dewatering state.
  • the target residual moisture content 31 is compared (checked) with the flow rate of the drain pump during the second plateau spin cycle 20, so that the control device only considers the target residual moisture content 31 as having been reached when the flow rate of the drain pump falls below a minimum average. If the target residual moisture 31 is reached, the drum is braked 21 and the drain pump is put into an inactive mode 24 .
  • the spin duration calculation to achieve the target residual moisture value 31 is based on a stored laundry residual moisture calculation model, which is calculated using a dry load detection, a laundry retention capacity forecast (using a corresponding method), the amount of water let in, the target speed 30, the previous speed history and parameters to take into account the drum geometry an algorithm calculates the corresponding optimal spin profile (in particular the required spin time).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP20150441.2A 2019-01-15 2020-01-07 Verfahren zum schleudern von wäsche, steuervorrichtung für ein wäschebehandlungsgerät, wäschebehandlungsgerät und computerprogramm Active EP3683344B1 (de)

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EP4335349A1 (de) * 2022-09-09 2024-03-13 Miele & Cie. KG Verfahren zum abpumpen von flüssigkeiten bei haushaltsgeräten
BE1030863B1 (de) * 2022-09-12 2024-04-08 Miele & Cie Abpumpen von Flüssigkeiten bei Haushaltsgeräten

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DE3825502A1 (de) 1988-07-27 1990-02-01 Licentia Gmbh Verfahren und vorrichtung zur steuerung des laugen-abpumpvorgangs bei waschmaschinen
JPH1119393A (ja) * 1997-07-07 1999-01-26 Toshiba Corp 洗濯機
DE102008029910C5 (de) 2008-06-24 2020-03-05 BSH Hausgeräte GmbH Verfahren zur Lastzustandserkennung einer Pumpe
JP5259441B2 (ja) * 2009-01-30 2013-08-07 株式会社東芝 ドラム式洗濯機
DE102010028614A1 (de) 2010-05-05 2011-11-10 BSH Bosch und Siemens Hausgeräte GmbH Pumpeneinrichtung sowie wasserführendes Hausgerät mit einer solchen
US9115455B2 (en) * 2010-12-09 2015-08-25 Whirlpool Corporation Method and apparatus for controlling the extraction duration in a laundry treating appliance
JP5873968B2 (ja) * 2011-09-05 2016-03-01 パナソニックＩｐマネジメント株式会社 洗濯機
DE102013210129A1 (de) * 2013-05-29 2014-12-04 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb einer Waschmaschine mit einer verbesserten Restfeuchte der Wäsche sowie hierzu geeignete Waschmaschine
EP3077582A1 (en) * 2013-12-06 2016-10-12 Electrolux Appliances Aktiebolag Laundry treatment apparatus having a laundry water content sensor
US10017892B2 (en) * 2014-02-21 2018-07-10 Samsung Electronics Co., Ltd. Washing apparatus and controlling method thereof
DE102014104088A1 (de) * 2014-03-25 2015-10-01 Miele & Cie. Kg Waschvollautomat und Wasserzulaufregelung desselben
DE102016204347A1 (de) * 2016-03-16 2017-09-21 BSH Hausgeräte GmbH Verfahren zum Betrieb eines wasserführenden Haushaltsgeräts mit verbessertem Pumpbetrieb
DE102017201008B3 (de) * 2017-01-23 2018-06-21 BSH Hausgeräte GmbH Wäschepflegegerät mit einer Steuerung
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CN107287845B (zh) * 2017-08-03 2019-05-10 西京学院 一种泵驱动涡流式洗衣机

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CN111434823A (zh) 2020-07-21
CN111434823B (zh) 2023-12-01
PL3683344T3 (pl) 2022-12-27
EP3683344A1 (de) 2020-07-22

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