EP4414495B1 - Verfahren zum betreiben einer waschmaschine und waschmaschine - Google Patents

Verfahren zum betreiben einer waschmaschine und waschmaschine

Info

Publication number
EP4414495B1
EP4414495B1 EP23382122.2A EP23382122A EP4414495B1 EP 4414495 B1 EP4414495 B1 EP 4414495B1 EP 23382122 A EP23382122 A EP 23382122A EP 4414495 B1 EP4414495 B1 EP 4414495B1
Authority
EP
European Patent Office
Prior art keywords
drum
laundry items
variation
determined
coefficient
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
EP23382122.2A
Other languages
English (en)
French (fr)
Other versions
EP4414495A1 (de
Inventor
Toni Torres
Jordi Camps
Pau Sala
Alvar Villegas
Gerard Sanchez
Uwe Schaumann
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau 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 EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Priority to EP23382122.2A priority Critical patent/EP4414495B1/de
Priority to US18/403,837 priority patent/US20240271347A1/en
Priority to KR1020240016784A priority patent/KR20240125447A/ko
Priority to CN202410163361.1A priority patent/CN118480936A/zh
Publication of EP4414495A1 publication Critical patent/EP4414495A1/de
Application granted granted Critical
Publication of EP4414495B1 publication Critical patent/EP4414495B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • 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
    • 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
    • D06F33/36—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of washing
    • 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 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/48—Preventing or reducing imbalance or noise
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/16—Imbalance
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • 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
    • D06F34/20—Parameters relating to constructional components, e.g. door sensors
    • 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
    • D06F37/30—Driving arrangements 
    • D06F37/304—Arrangements or adaptations of electric motors
    • 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
    • D06F2101/00—User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2101/10—Spin speed
    • 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
    • D06F2103/24—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
    • D06F2103/26—Imbalance; Noise level
    • 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
    • D06F2103/44—Current or voltage
    • D06F2103/46—Current or voltage of the motor driving the drum
    • 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
    • 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
    • D06F2105/10—Temperature of washing liquids; Heating means therefor
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D06F2105/48—Drum speed
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user

Definitions

  • the invention is directed to a method for operating a washing machine as well as to a washing machine designed to perform this method, wherein the washing machine has a washing machine control, which is programmed to perform this method.
  • EP 2 524 989 B1 Another similar method is known from EP 2 524 989 B1 and also from EP 4 008 825 A1 , where a torque of a drive motor of the drum of a washing machine is monitored to find out how laundry items behave inside the drum.
  • EP 1 636 410 A1 A further method is known from EP 1 636 410 A1 . This method serves to detect an unbalanced condition of a load of laundry in a washing machine drum.
  • the method according to the invention is directed to operating a washing machine, wherein the washing machine comprises a drum and preferably also a receptacle for the drum to rotate in.
  • a drive motor is provided to rotate the drum in this receptacle, wherein a power supply is provided to provide the drive motor with power.
  • this motor current is an indication of the momentary power that is consumed by the motor and is transformed into mechanical energy. In consequence, this motor current is also an indicator of the torque that is provided by the drive motor.
  • the power supply is also designed to monitor a motor current that is supplied to the drive motor.
  • the washing machine also has a washing machine control, which monitors and detects the motor current from the power supply or by means of the power supply. This washing machine control preferably is the main control for the whole washing machine, which also has washing programs running and is preferably connected to a user interface or input/output unit, respectively.
  • the drum with laundry items in it is rotated by means of the drive motor.
  • the laundry items may have been placed into the drum before by a user through a conventional door or the like.
  • the motor current is constantly monitored and also recorded for further use.
  • the rotational position of the drum is also monitored and recorded. This serves to know not only the rotational speed of the drum, but also the exact position of the drum, which may be important when taking into account that laundry items may be concentrated rather in one region inside the drum.
  • step B one or each of the full revolutions of the drum during its rotational movement is divided into at least three rotation sections, wherein the motor current is monitored and recorded for each of these rotation sections.
  • those rotation sections are preferably of equal size, so they may for example be 120°, 90°, 72° and so on.
  • step C the drum is rotated for at least three full revolutions at a constant rotational speed. This is preferably done in continuous manner, such that there is no stop or slowing down of the rotational speed, but one continuous movement is effected.
  • Each of these full revolutions is divided into the rotation sections as explained before. This serves for the washing machine control to have a correlation of rotation position to the motor current and in consequence of the torque of the motor for each of the rotation sections.
  • a motor current curve is monitored by the washing machine control, and an envelope curve of this motor current is calculated, such that the envelope curve of the motor current for each rotation section and also for the full revolution is known.
  • a standard deviation is calculated from the envelope curve to know the standard deviation ⁇ for each rotation section.
  • step E the respective standard deviation ⁇ is divided by the mean value ⁇ of the motor current or of the value of the envelope curve to determine the coefficient of variation CV for each rotation section.
  • this coefficient of variation CV for each rotation section that has been determined as described before is compared with stored values for this coefficient of variation CV to determine the behavior of the laundry items in the drum.
  • stored values for the CV can be stored in relation to specific parameters of the laundry items that are known, the most prominent of which are total weight of the laundry items in the drum, kind of laundry items or specific kind of main fibers of the laundry items or the like.
  • This behavior of the laundry items may be sliding of the laundry items down the drum inner wall during rotating, a fall from the drum inner wall or, in particular at higher rotational speeds, a rotating of the laundry items together with the drum while remaining in substantially the same position of the drum inner wall due to centrifugal forces.
  • a following step G after having determined the behavior of the laundry items as described before, specific parameters are determined or derived therefrom for the further operation of the washing machine with regard to the treatment of the laundry items. These parameters are temperature, duration of the washing process or of certain sections of the washing process, rotational speed of the drum, type and quantity of additives or detergents that are used, or the like. Further parameters are of course available as is known in the art.
  • the invention serves to find out more information about the laundry items in the drum without the need of specific additional and costly sensors in the washing machine that also need additional effort when manufacturing the washing machine or its components, respectively. Furthermore, by calculating the envelope curve of the motor current, its standard deviation ⁇ and the coefficient of variation CV of the movement of the drum with the laundry items in it, at least divided into the rotation sections as explained before, it is possible to retrieve information about the laundry items and their behavior which is in some way standardized. This again allows for a standardized comparison with stored values which are characteristic for specific situations, which again allows for finding out more about the laundry items solely based on information from the motor current and the rotational position of the drum. No further hardware is needed for this that is not already present in a standard washing machine. If the drive motor for the drum is a so-called direct drive, for example with a BLDCM motor, the information about the rotation position is already included anyway.
  • the drum is rotated for the at least three full revolutions at a rotational speed lying between 30 rpm and 90 rpm, in particular between 55 rpm and 65 rpm, for example at about 60 rpm.
  • This specific rotational speed is advantageous because the laundry items may well perform any of the three behaviors described before, such that they do not necessarily slide down in the drum due to a very low rotational speed or rotate with the drum due to a relatively high rotational speed.
  • the rotational speed mentioned before should be constant for the three or any number of revolutions such that the external conditions do not change.
  • the steps A to F as described before can be carried out twice or several times for different rotational speeds in each case of carrying out all these steps.
  • the rotational speeds can be increased after each complete cycle of steps. This can serve for better retrieving information about the laundry items if the characteristics apply for different rotational speeds. It is regarded as advantageous to increase the rotational speed after each cycle of carrying out all the steps or the steps B to F, wherein such an increase may be by 10% up to 50% or even up to 100%.
  • the method can help to detect whether the laundry items in the drum are sufficiently evenly distributed.
  • a predefined limit value for the coefficient of variation CV can be used to be compared with the measured value for the coefficient of variation. If this comparison falls below said predefined limit value, then the rotational speed for the drum may be changed as a consequence to redistribute laundry items in the drum to achieve a more even distribution. This may help to compensate for any imbalance of the laundry items in the drum. This helps to reach higher rotational speeds, reduce vibration and in consequence annoying noise in addition to preventing mechanical damage to the washing machine, for example by excessive wear of any bearings.
  • several parameters can be used to detect a sufficiently even distribution of the laundry items in the drum, which are a weight of the laundry items which has been initially determined, preferably in a dry state. Furthermore, a stored value for the coefficient of variation CV for this determined weight of laundry items and for their behavior with falling from the drum inner wall is used. After this, the steps B to E are carried out at least once in order to determine whether the value determined in this way for the coefficient of variation actually corresponds to the stored value. If this is not the case, the rotational speed and/or a direction of rotation of the drum is changed, in particular the rotational speed may be reduced or the drum may even be stopped to effect a redistribution of the laundry items in the drum.
  • the same is done one more time to again compare the determined value with the stored value. If again they do not correspond to each other or do not correspond with a deviation of maximum 10% to 20%, the procedure is repeated. If at any time the values corresponds sufficiently to each other, then the drum may be accelerated to high speeds, for example for a dry spinning of the laundry items.
  • the following parameters or information may be used to detect whether the laundry items in the drum are sufficiently evenly distributed. These include the weight of the laundry items determined at the beginning of the process, preferably in their dry state. Furthermore, a stored value for the coefficient of variation CV corresponding to this determined weight of the laundry items may be used, preferably also another stored value for the behavior of the laundry items with falling from the drum inner wall. Together with using these values, the steps B to E as described before are carried out to determine whether the value for the coefficient of variation as determined in this way corresponds to the stored value. If this is the case, the drum can be rotated faster to a higher rotational speed, which preferably may be used for dry spinning the laundry items or another purpose.
  • the weight of the laundry items determined at the beginning of the process is used again as well as a stored value for the coefficient of variation for this determined weight and for the behavior of the laundry items rotating together with the drum, which means that the laundry items do not fall down and do not slide along the inner wall.
  • the steps B to E are carried out again for determining whether the value of the coefficient of variation that has been determined by this corresponds to the stored value for a behavior of the laundry items corresponding to a rotation together with the drum. If this is the case, the rotational speed for the drum is lowered to check again whether the laundry items still fall from the drum inner wall. This may serve to approach a rotational speed lying slightly or significantly above the point where the laundry items fall down.
  • the steps B to E are carried out at a constant rotational speed. This serves to determine whether the value determined for the coefficient of variation CV corresponds to the stored value for the behavior of the laundry items with them sliding down the drum inner wall. Then another differentiation can be made such that if the laundry items indeed slide down, the rotational speed for the drum is raised again. Then it is checked again whether the laundry items still fall from the drum inner wall at the higher rotational speed. On the other hand, if this is not the case, it is checked as described before in connection with the sufficiently even distribution of laundry items in the drum whether these items still fall from the drum inner wall while the rotational speed remains unchanged.
  • a treatment process of the laundry items is further carried out if a distribution of the laundry items is considered to be sufficiently uniform.
  • a dry spinning process may preferably be carried out because high rotational speeds are used for dry spinning, and for these high rotational speeds a uniform distribution is advantageous or even necessary to avoid vibrations as discussed before.
  • the weight of the laundry items may be determined at the beginning of the process. Then a stored value for the coefficient of variation CV for this determined weight of laundry items is used, which also characterizes the behavior of the laundry items in case they rotate together with the drum such that they do not fall or slide down. After that, the laundry items are moistened by introducing water into the drum or onto the laundry items, preferably by spraying.
  • the steps B to E as described before are carried out, which serves to determine whether the value for the coefficient of variation determined in this way corresponds to the stored value for the behavior of the laundry items with rotation together with the drum. If this is the case, the rotational speed of the drum is raised to a higher speed, which may for example be used for a dry spinning process of the laundry items. If this not the case, the rotational speed and/or a direction of rotation of the drum are changed, which serves to redistribute the laundry items again to allow for a higher rotational speed without vibrations.
  • the determined value for the coefficient of variation does not correspond to the stored value for the behavior of the laundry items with a rotation together with the drum, it is checked at a constant rotational speed whether the laundry items fall from the drum inner wall. Such a check can be made as described initially. Then the weight of the laundry items determined at the beginning is used for this purpose and a stored value for the coefficient of variation for this determined weight of laundry items and for the behavior of the laundry items with falling from the drum inner wall is used. After this, the steps B to E are carried out again in order to determine whether the value for the coefficient of variation determined in this way corresponds to the stored value for the behavior of the laundry items with falling from the drum inner wall.
  • the drum is rotated faster, and then it is checked again to see whether the laundry items are still rotating together with the drum at the higher rotational speed. If this is not the case, the steps B to E are carried out again at a constant rotational speed. This serves to determine whether the value determined for the coefficient of variation corresponds to the stored value for the behavior of the laundry items with sliding down the drum inner wall. Again, if this is the case, the drum is rotated at a higher rotational speed, and then a check is made to see whether the laundry items are still sliding down the drum inner wall at this higher rotational speed. If this is not the case, a check is made in accordance to what has been described before for the detection of sufficiently evenly distributed laundry items to see whether the laundry items are still rotating with the drum at the same rotational speed.
  • a washing process for the laundry items in the drum with water is monitored. This may be used for determining of the appropriate washing process for the specific laundry items detected in the drum.
  • the weight of the laundry items determined at the beginning is used as well as a stored value for the coefficient of variation CV for this determined weight of the laundry items as well as for the behavior of the laundry items desired for this specific washing process.
  • the steps B to E are carried out again to determine whether the value for the coefficient of variation determined in this way corresponds to the stored value for the desired behavior of the laundry items. If this is the case, the drum is further rotated at the same rotational speed and in the same direction for the next wash cycle. If, however, this is not the case, the rotational speed and/or direction of rotation of the drum is changed. This may serve to better redistribute the laundry items in the drum.
  • the quantity or weight of the laundry items in the drum is always determined at the beginning of operating the washing machine or before starting a washing process. This may be either done by weighing the laundry items with physical weighing sensors. This is known in the art to the skilled person in detail. Alternatively, the motor current can be monitored as the drum rotates with the laundry items in it. This is also known in the art, and such a method does not need any specific additional weighing sensors or the like.
  • washing machine 11 has a housing 12 with a rotating drum 14 in it being placed in a fix drum receptacle 13 surrounding it.
  • Drum 14 is rotated or driven, respectively, by a drive motor 16 with drive belt 17 as is common in the art.
  • a drive motor 16 with drive belt 17 as is common in the art.
  • three paddles 19 forming well-known protrusions are provided in rib-like form or in the form of a triangle with a rounded tip pointing inside the drum 14.
  • the paddles 19 are shown in profile and can preferably have this form in a direction parallel to the rotation axis of drum 14.
  • the paddles 19 are advantageous for the regular washing process, but are not absolutely necessary for the invention at hand.
  • Washing machine control 34 is connected to a current sensor 35, which is able to exactly supervise the drive current supplied to drive motor 16 by the power control unit 32.
  • a current sensor 35 is known in the art and can be provided by the person skilled in the art without any problem. It may also be integrated into the power control unit 32 or into the drive motor 16 itself.
  • Integrated into drive motor 16 may be a rotation position sensor means for supervising or detecting a rotation position of the drum, which is not shown here due to the integration.
  • a rotation position sensor means can be integrated into the drive motor 16 as is also common in the art, preferably as an incremental encoder.
  • the rotation position sensor means is also connected to the central washing machine control 34. Washing machine control 34 is also provided with a storage 37 as mentioned before and will be explained in detail hereinafter, preferably being integrated into one semi-conductor component.
  • drum 14 is shown with a laundry item 30 in it.
  • a center of gravity or mass of the laundry item 30 is at an angle ⁇ to the vertical axis as indicated by the dashed line.
  • Laundry item 30 is abutted against the inside of drum 14 due to rotation of the drum 14.
  • the force of gravity F GR is pointing vertically downwards.
  • the centrifugal force F CE generated by the rotation of the drum 14 and depending on its rotation speed is pointing outwards in radial direction away from a center of drum 14 and through the center of gravity of the laundry item 30.
  • a frictional force F FR is pointing upwards from the region of contact of laundry item 30 with the inside of drum 14 in a circumferential direction or in tangential direction, respectively, which is also at right angle to the centrifugal force F CE .
  • a sliding force F SL is pointing in the opposite direction of the frictional force F FR .
  • the laundry item 30 is moved counterclockwise with rotating drum 14 by the frictional force F FR , if it does not abut against a paddle 19.
  • the sliding force F SL is pulling the laundry item 30 downward again initiated by the gravity force F GR .
  • laundry item 30 is simply sliding down on the inside of drum 14, most probably also over a paddle 19. If a certain rotational speed is exceeded, the laundry item 30 will be pressed by the centrifugal force F CE against the inside of the drum 14 and will not move relative to the drum 14 but rotate with it and with exactly the same rotational speed.
  • any change in the rotational speed of the drum means a change in the kinetic energy of the system of drum 14 and laundry item 30 combined.
  • the required energy or momentary power of the drive motor 16 to speed up the drum from the first low rotational speed to the second high rotational speed is significantly less than when a relatively large quantity of laundry item 30 is inside drum 14. This difference in the required energy or power, respectively, from the drive motor 16 can be detected and can particularly be stored in the storage 37 connected to the washing machine control 34.
  • the washing machine 11 is loaded with an unknown quantity of laundry, this serves according to the invention to detect the power or energy requirement needed for this higher rotational speed and can be compared with memory values for the power or energy stored in the storage 37.
  • these values are not stored directly in relation to power or energy, but to current minimum, current maximum and average current.
  • a schematic method for redistributing laundry items in the drum is shown.
  • This algorithm may specifically be selected by a user or by a washing program in case it is needed.
  • the amount of laundry items or the load, respectively is chosen. This value is preferably detected in any way at the beginning of each washing or laundry treatment process, with the advantage that the laundry items are dry at this point.
  • the corresponding coefficient of variation is chosen correlated with this load amount and with the behavior of the laundry items falling from the drum inner wall.
  • the steps B to F as described before are performed to find out whether such a falling movement has been detected or not. If it has been detected, then the laundry items need to be rotated faster to find an unbalance speed. If such a falling movement has not been detected, there are two possibilities of what the laundry items behavior might be.
  • it is detected whether the laundry items rotate together with the drum so the values determined in steps B to F are compared with the suitable coefficient of variation for such a rotation movement. If this is the case, the drum is slowed down to allow the laundry items to fall down and not to rotate together with the drum.
  • a load wetting algorithm is described, which has the aim that the wet laundry should rotate together with the drum.
  • a value for the load amount in dry state is needed again. This can be done as described before.
  • the coefficient of variation CV for a rotation movement of the laundry items is selected corresponding to this load amount.
  • the wetting phase has already started, which means that water is brought into the drum or directly onto the laundry items, respectively. If this has been the case, the steps B to F are performed again. At first, it is checked whether a rotation movement of the laundry items has been detected. If this is the case, then the rotational speed is kept constant. Preferably, more water can be brought onto the laundry items, such that in this wetting phase it is checked once more whether there still is a rotation movement. If, however, a rotation movement has not been detected, it is checked whether a falling movement can be detected. This can be done as described before.
  • this rotational speed is increased somewhat, for example for 10% to 30% or even 100%. After the increase, it is checked once more with the process according to steps B to F what kind of movement of the laundry items is to be found.
  • the rotational speed for a sliding movement is lower than for a falling movement. If this is the case, then the rotational speed is also increased, preferably even stronger than in the case of a falling movement described before. This also serves to reach a rotation movement of the laundry items. If also no sliding movement can be detected, the steps B to F are performed once more to try to detect which kind of movement is present.
  • Fig. 5 another algorithm is shown which serves for an improved washing.
  • the load amount needs to be known as has been described before.
  • a coefficient of variation corresponding to this load amount and any movement required for the washing algorithm is chosen. This may be any of the three movements described before.
  • the steps B to F are performed to find out whether the required movement has been detected or their coefficients of variation correspond to each other sufficiently. If this is the case, the rotational speed can be kept constant to continue with the same way or process in the washing process. If this is not the case, then the rotational speed or even the sense of rotation may be changed as described before.
  • a typical curve for the motor current I is shown over the time in thin line.
  • the envelope curve of the motor current I is shown. This envelope curve is used for the algorithms and formulae described herein, because it can be used much better and easier.
  • a movement of a laundry item with five positions is shown corresponding to a falling movement. Furthermore, this is valid for the case that the washing machine 11 has paddles 19 as described initially.
  • the laundry item starts to fall down between points 3 and 4, which is at the end of the first quarter of a turn, where the quarters are counted anti-clockwise, which corresponds to the sense of rotation of the drum.
  • the laundry item is still in contact with the inner wall of the drum, starts from there continuing to point 4 and then falling down to point 5.
  • Fig. 8 the envelope curve of the motor current I is shown over an increasing number of samples with three full turns for a falling movement with a paddle in the drum, and afterwards for two full turns for a real sliding movement. This shows according to the table of Fig. 7 that the coefficient of variation CV for the sliding movement is significantly less than for the falling movement.
  • Fig. 11 a movement of the laundry items together with the drum is shown. This is rather simple and means that the laundry item rotates exactly together with the drum without any relative movement, neither sliding nor falling.
  • Fig. 12 shows the corresponding current envelope of the motor current I, which does not vary very much. The corresponding coefficient of variation CV which has again been calculated according to the formula described initially is again significantly higher than for the falling and for the sliding movement.
  • Fig. 13 the coefficient of variation is shown for three situations corresponding to a movement of a laundry item with falling in a drum with paddles.
  • the CV varies for each of the thirds of each turn. It also varies for each turn again. This shows that no exact numerical values can be derived, but they nevertheless serve to detect movements of laundry items in the drum with sufficient accuracy.

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

Claims (15)

  1. Verfahren zum Betreiben einer Waschmaschine, wobei die Waschmaschine umfasst:
    - eine Trommel,
    - einen Antriebsmotor für die Trommel,
    - eine Stromversorgung für den Antriebsmotor mit Überwachung eines Motorstroms,
    - eine Waschmaschinensteuerung, wobei die Waschmaschinensteuerung den Motorstrom mittels der Stromversorgung überwacht und erfasst,
    mit den folgenden Schritten:
    0 das Gewicht der Wäschestücke wird zu Beginn des Prozesses bestimmt.
    A die Trommel mit den Wäschestücken darin mittels des Antriebsmotors gedreht wird und der Motorstrom ständig überwacht und aufgezeichnet wird, wobei auch die Drehposition der Trommel überwacht und aufgezeichnet wird,
    B eine vollständige Umdrehung der Trommel in mindestens drei Drehabschnitte unterteilt wird und der Motorstrom für jeden der Drehabschnitte überwacht und aufgezeichnet wird, wobei die Drehabschnitte vorzugsweise gleich groß sind,
    gekennzeichnet durch die weiteren Schritte:
    C die Trommel wird mit konstanter Drehzahl, vorzugsweise kontinuierlich, um mindestens drei vollständige Umdrehungen gedreht.
    D für den für jeden Drehabschnitt ermittelten Motorstrom wird die Hüllkurve dieses Motorstroms berechnet, und aus der Hüllkurve wird die Standardabweichung (σ) mit einer Formel berechnet.
    E dann wird die jeweilige Standardabweichung (σ) durch den Mittelwert (µ) des Motorstroms oder der Hüllkurve geteilt, um den Variationskoeffizienten (CV) für jeden Drehabschnitt zu bestimmen,
    F durch Vergleichen des für jeden Drehabschnitt ermittelten Variationskoeffizienten (CV) mit gespeicherten Werten für den Variationskoeffizienten wird das Verhalten der Wäschestücke dahingehend bestimmt, ob die Wäschestücke während der Drehung in der Trommel an der Trommelinnenwand herunterrutschen, von der Trommelinnenwand herunterfallen oder sich zusammen mit der Trommel drehen, während sie im Wesentlichen in derselben Position an der Trommelinnenwand verbleiben,
    G aus der Bestimmung des Verhaltens der Wäschestücke werden Parameter für den weiteren Betrieb der Waschmaschine hinsichtlich der Behandlung der Wäschestücke bestimmt, wobei die Parameter aus der Gruppe ausgewählt werden: Temperatur, Dauer des Waschvorgangs oder bestimmter Abschnitte des Waschvorgangs, Drehzahl der Trommel, Art und Menge der verwendeten Zusatzstoffe oder Waschmittel.
  2. Verfahren nach Anspruch 1, wobei die Formel zur Berechnung des Variationskoeffizienten (CV) lautet: CV = Standardabweichung Mittelwert = σ μ
  3. Verfahren nach Anspruch 1 oder 2, wobei die Formel zur Berechnung der Standardabweichung (σ) lautet: σ = ∑ i = 1 N x i − μ 2 N , wobei xi der Datenpunktwert, µ der Mittelwert der Stichproben und N die Anzahl der Stichproben ist.
  4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Trommel für die drei vollständigen Umdrehungen mit einer Drehzahl zwischen 30 U/min und 90 U/min, vorzugsweise zwischen 55 U/min und 65 U/min, gedreht wird.
  5. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Verfahren mit den Schritten A bis F mehrmals für jeweils unterschiedliche Drehzahlen, insbesondere für jeweils steigende Drehzahlen, durchgeführt wird, wobei die Drehzahlen vorzugsweise um 10 % bis 100 % ansteigen.
  6. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Verfahren feststellt, ob die Wäschestücke in der Trommel ausreichend gleichmäßig verteilt sind, indem ein vordefinierter Grenzwert für den Variationskoeffizienten zum Vergleich mit dem gemessenen Wert für den Variationskoeffizienten verwendet wird, und wenn der Vergleich unter diesen vordefinierten Grenzwert fällt, dann die Drehzahl für die Trommel geändert wird, um die Wäschestücke in der Trommel für eine gleichmäßigere Verteilung neu zu verteilen, um die Unwucht der Wäschestücke in der Trommel auszugleichen.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass zur Erkennung der ausreichend gleichmäßigen Verteilung der Wäschestücke in der Trommel Folgendes verwendet wird: das anfänglich bestimmte Gewicht der Wäschestücke, ein gespeicherter Wert für den Variationskoeffizienten (CV) für dieses bestimmte Gewicht der Wäschestücke und für das Verhalten der Wäschestücke beim Herunterfallen von der Trommelinnenwand, dann werden die Schritte B bis E durchgeführt, um festzustellen, ob der so bestimmte Wert für den Variationskoeffizienten (CV) dem gespeicherten Wert entspricht, und
    - wenn dies nicht der Fall ist, die Drehzahl und/oder Drehrichtung der Trommel geändert wird, und
    - wenn dies der Fall ist, die Trommel für eine hohe Drehzahl, insbesondere für das Trockenschleudern, schneller gedreht wird.
  8. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass zur Ermittlung der ausreichend gleichmäßigen Verteilung der Wäschestücke in der Trommel Folgendes verwendet wird: das zu Beginn ermittelte Gewicht der Wäschestücke, ein gespeicherter Wert für den Variationskoeffizienten (CV) für dieses ermittelte Gewicht der Wäschestücke und für das Verhalten der Wäschestücke beim Herabfallen von der Trommelinnenwand, dann werden die Schritte B bis E durchgeführt, um festzustellen, ob der auf diese Weise ermittelte Wert für den Variationskoeffizienten (CV) dem gespeicherten Wert entspricht, und
    - ist dies der Fall, wird die Trommel für eine hohe Geschwindigkeit, insbesondere für einen Trockenschleudergang, schneller gedreht, und
    - wenn dies nicht der Fall ist, wird überprüft, ob die Wäschestücke zusammen mit der Trommel drehen, wobei das Gewicht der Wäschestücke zu Beginn bestimmt wird, ein gespeicherter Wert für den Variationskoeffizienten (CV) für dieses bestimmte Gewicht der Wäschestücke und für das Verhalten der mit der Trommel drehenden Wäschestücke verwendet wird, und dann werden die Schritte B bis E durchgeführt, um zu bestimmen, ob der so bestimmte Wert des Variationskoeffizienten (CV) dem gespeicherten Wert für das Verhalten der Wäschestücke bei Drehung zusammen mit der Trommel entspricht, und
    ∘ wenn dies der Fall ist, wird die Trommel langsamer gedreht und dann erneut geprüft, ob die Wäschestücke bei der niedrigeren Drehzahl noch von der Trommelinnenwand fallen, und
    o wenn dies nicht der Fall ist, werden die Schritte B bis E bei konstanter Drehzahl durchgeführt, um festzustellen, ob der ermittelte Wert für den Variationskoeffizienten (CV) dem gespeicherten Wert für das Verhalten der Wäschestücke beim Herunterrutschen an der Trommelinnenwand entspricht, und
    + wenn dies der Fall ist, wird die Trommel schneller gedreht und dann erneut geprüft, ob die Wäsche bei der höheren Drehzahl noch von der Trommelinnenwand fällt, und
    + wenn dies nicht der Fall ist, wird gemäß Anspruch 7 geprüft, ob die Wäschestücke bei gleichbleibender Drehzahl noch von der Trommelinnenwand fallen.
  9. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass für den Fall, dass eine Verteilung der Wäschestücke als ausreichend gleichmäßig angesehen wird, ein Behandlungsprozess der Wäschestücke weiter durchgeführt wird, insbesondere ein Trockenschleudervorgang.
  10. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass eine Befeuchtung der Wäschestücke in der Trommel mit Wasser überwacht wird, vorzugsweise zur Erfassung der ausreichend gleichmäßigen Befeuchtung der Wäschestücke in der Trommel: das zu Beginn ermittelte Gewicht der Wäschestücke, ein gespeicherter Wert für den Variationskoeffizienten (CV) für dieses ermittelte Gewicht der Wäschestücke und für das Verhalten der Wäschestücke bei Drehung zusammen mit der Trommel gespeichert wird, dann werden die Wäschestücke durch Einleiten von Wasser in die Trommel und/oder auf die Wäschestücke befeuchtet, dann werden die Schritte B bis E durchgeführt, um festzustellen, ob der so ermittelte Wert für den Variationskoeffizienten (CV) dem gespeicherten Wert für das Verhalten der Wäschestücke bei Drehung zusammen mit der Trommel entspricht, und
    - wenn dies der Fall ist, wird die Trommel für eine hohe Geschwindigkeit, insbesondere für einen Trockenschleudergang, schneller gedreht, und
    - wenn dies nicht der Fall ist, werden vorzugsweise die Drehzahl und/oder die Drehrichtung der Trommel geändert.
  11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass für den Fall, dass der ermittelte Wert für den Variationskoeffizienten (CV) nicht mit dem gespeicherten Wert für das Verhalten der Wäschestücke bei Drehung zusammen mit der Trommel übereinstimmt, bei konstanter Drehzahl überprüft wird, ob die Wäschestücke von der Trommelinnenwand fallen, wobei das zu Beginn ermittelte Gewicht der Wäschestücke verwendet wird, ein gespeicherter Wert für den Variationskoeffizienten (CV) für dieses ermittelte Gewicht der Wäschestücke und für das Verhalten der Wäschestücke beim Herunterfallen von der Trommelinnenwand verwendet wird, und dann die Schritte B bis E durchgeführt werden, um zu ermitteln, ob der so ermittelte Wert für den Variationskoeffizienten (CV) mit dem gespeicherten Wert für das Verhalten der Wäschestücke beim Herunterfallen von der Trommelinnenwand übereinstimmt, und
    o wenn dies der Fall ist, wird die Trommel schneller gedreht und dann erneut geprüft, ob die Wäschestücke bei der höheren Drehzahl noch zusammen mit der Trommel drehen, und
    o wenn dies nicht der Fall ist, werden die Schritte B bis E bei konstanter Drehzahl durchgeführt, um zu bestimmen, ob der ermittelte Wert für den Variationskoeffizienten (CV) dem gespeicherten Wert für das Verhalten der Wäschestücke beim Herunterrutschen von der Trommelinnenwand entspricht, und
    + wenn dies der Fall ist, wird die Trommel schneller gedreht und dann erneut geprüft, ob die Wäschestücke bei der höheren Drehzahl noch an der Trommelinnenwand herunterrutschen, und
    + wenn dies nicht der Fall ist, wird gemäß Anspruch 7 geprüft, ob die Wäschestücke noch mit der Trommel bei derselben Drehzahl drehen.
  12. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass ein Waschvorgang für die Wäschestücke in der Trommel mit Wasser überwacht wird, wobei zur Ermittlung des geeigneten Waschvorgangs für die Wäschestücke in der Trommel vorzugsweise Folgendes verwendet wird: das zu Beginn ermittelte Gewicht der Wäschestücke, einen gespeicherten Wert für den Variationskoeffizienten (CV) für dieses ermittelte Gewicht der Wäschestücke und für das für den Waschvorgang gewünschte Verhalten der Wäschestücke, dann werden die Schritte B bis E durchgeführt, um festzustellen, ob der so ermittelte Wert für den Variationskoeffizienten (CV) dem gespeicherten Wert für das gewünschte Verhalten der Wäschestücke entspricht, und
    - ist dies der Fall, wird die Trommel für den nächsten Waschzyklus mit derselben Drehzahl und in derselben Richtung gedreht, und
    - wenn dies nicht der Fall ist, werden die Drehzahl und/oder die Drehrichtung der Trommel geändert.
  13. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Menge oder das Gewicht der Wäschestücke in der Trommel zu Beginn bestimmt wird, vorzugsweise entweder durch Wiegen oder durch Überwachen des Motorstroms, während sich die Trommel mit den Wäschestücken darin dreht.
  14. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass zusätzlich zur Standardabweichung und zur mittleren Abweichung der Variationskoeffizient verwendet wird.
  15. Waschmaschine, umfassend:
    - eine Trommel,
    - einen Antriebsmotor für die Trommel,
    - eine Stromversorgung für den Antriebsmotor mit Überwachung eines Motorstroms,
    - eine Waschmaschinensteuerung, wobei die Waschmaschinensteuerung den Motorstrom mittels der Stromversorgung überwacht und erfasst,
    wobei die Waschmaschinensteuerung so ausgelegt ist, dass sie das Verfahren gemäß einem der vorstehenden Ansprüche ausführt.
EP23382122.2A 2023-02-10 2023-02-10 Verfahren zum betreiben einer waschmaschine und waschmaschine Active EP4414495B1 (de)

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US18/403,837 US20240271347A1 (en) 2023-02-10 2024-01-04 Method for operating a washing machine and washing machine
KR1020240016784A KR20240125447A (ko) 2023-02-10 2024-02-02 세탁기를 작동시키기 위한 방법 및 세탁기
CN202410163361.1A CN118480936A (zh) 2023-02-10 2024-02-05 用于操作洗衣机的方法及洗衣机

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US7471054B2 (en) * 2003-06-11 2008-12-30 Askoll Holding S.R.L. Method for detecting unbalanced conditions of a rotating load driven by a synchronous motor and for controlling said motor
US20090249560A1 (en) * 2008-04-04 2009-10-08 Ken Gaulter Laundry water extractor speed limit control and method
US8915972B2 (en) 2011-05-17 2014-12-23 Whirlpool Corporation Method and apparatus for determining load fall in a laundry treating appliance
US9157177B2 (en) * 2011-12-21 2015-10-13 Whirlpool Corporation Laundry treating appliance and method of control
KR101555588B1 (ko) * 2012-10-31 2015-10-06 엘지전자 주식회사 세탁물 처리기기, 및 그 동작방법
JP2019154481A (ja) * 2018-03-07 2019-09-19 パナソニックＩｐマネジメント株式会社 洗濯機を制御する制御方法、制御装置及びプログラム
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