EP3819417A1 - Verfahren zur eigenfrequenzerfassung in einer trommelwaschmaschine - Google Patents

Verfahren zur eigenfrequenzerfassung in einer trommelwaschmaschine Download PDF

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Publication number
EP3819417A1
EP3819417A1 EP20206599.1A EP20206599A EP3819417A1 EP 3819417 A1 EP3819417 A1 EP 3819417A1 EP 20206599 A EP20206599 A EP 20206599A EP 3819417 A1 EP3819417 A1 EP 3819417A1
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EP
European Patent Office
Prior art keywords
washing machine
drum
washing
base
front wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20206599.1A
Other languages
English (en)
French (fr)
Other versions
EP3819417B1 (de
Inventor
Gregor CEPON
Joze Katanec
Mitja STIMULAK
Miha BOLTEZAR
Blaz STARC
Tomaz BREGAR
Ales Mihelic
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.)
Gorenje d o o
Original Assignee
Gorenje d o o
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Publication of EP3819417A1 publication Critical patent/EP3819417A1/de
Application granted granted Critical
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • 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
    • 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
    • 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 present invention relates to a method for detecting natural vibration frequencies in a body of a laundry washing machine in operation thereof with regard to the quality of its placement and the base on which it is placed.
  • the washing machine comprises a body with a front wall formed with a loading aperture, a movable door that can be used to close the loading aperture, and a washing tub arranged in said body and comprises an opening facing the front wall of said body and a washing drum for receiving laundry, whereby the washing drum comprises an opening that is at least approximately aligned with the opening of said tub and said loading aperture in the front wall, sensor means for directly or indirectly measuring vibrations, and a memory unit, a processing unit, a control unit, and a display unit.
  • the eccentric distribution of the laundry or its centre of gravity in the drum causes increased vibrations during the operation of the washing machine, which is usually solved by a repeated redistribution of the laundry until an acceptably small eccentricity is achieved.
  • Such a solution is disclosed in U.S. Pat. No. 6,401,284 B1 , for example.
  • the laundry may still be distributed during the operation of the washing machine when the mass eccentricity of the distributed laundry is acceptably low, but at the same time a large mass deviation load is present.
  • the detection of the mass eccentricity of the distributed laundry is not sufficient, as data on the mass deviation load is also required, which the above known solution does not teach.
  • Patent Application No. DE 10 2015 106 849 A1 discloses installation a three-axial accelerometer on the body of the washing machine, which enables active control of the vibrations of the entire washing machine.
  • Known solutions for active vibration control of a washing machine are based on the measurement of accelerations on the tub or body, whereby the vibration control is performed using the maximum permissible amplitudes without knowledge or identification of the dynamic properties of the washing machine.
  • the object of the present invention is to form a method for detecting the natural frequencies of vibrations in the body of a washing machine during its operation with regard to the quality of its placement and the base on which it is placed.
  • the object as set above is solved with an active system for detecting the transfer of force to the base, which enables the simultaneous detection of the eccentric and dynamic load in the drum and the identification of the dynamic properties of the washing machine.
  • an active system for detecting the transfer of force to the base which enables the simultaneous detection of the eccentric and dynamic load in the drum and the identification of the dynamic properties of the washing machine.
  • By controlling the rotational frequency of the washing machine drum it is possible to actively adjust the washing cycle according to the loads in the drum and the dynamic properties of the washing machine.
  • at least one calibration is anticipated at the user's place of installation of the washing machine, which is used to identify the dynamic properties of the entire washing machine-base system.
  • the washing cycle is adjusted to the individual user in order to avoid the operation of the washing machine in the resonance range. Moreover, based on the measurement of the force on the base, the limit value of the permitted force transmission is defined, which ensures a lower level of vibration and consequently a quieter living environment.
  • a method according to the invention in addition to the automatic adjustment of the washing cycle, also offers the user an interactive insight into the quality of the placement of the washing machine on the base.
  • the proposed method it is possible to identify a possible incorrect position or uneven load on the support legs of the washing machine, which is reflected in the unstable position of the washing machine on the base.
  • the measurement of the force on the base additionally enables the identification of the mass deviation or dynamic load in the washing machine drum.
  • the above load which shows zero eccentricity, cannot be detected by measuring the torque of the electric motor, thus it is provided for according to the present invention an indirect measurement of the mass deviation load by means of a simultaneous measurement of the force transmission to the base and an indirect measurement of the eccentricity by means of the torque of the electric motor.
  • An increased transmission of force to the base indicates an eccentric or deviation load, and the data from the electric motor on the eccentricity enables the distinction between these two loads.
  • At least one sensor 1 for indirectly measuring the force from a washing machine 2 to a base is placed near at least one of support legs 3 of the washing machine 2, where the deformations of a body 4 of the washing machine 2 are directly related to the magnitude of the transmitted force.
  • the spatial placement of the sensor 1 is arbitrary, preferably in the lower part of the body, particularly in the area of the bottom or near at least one of the support legs 3.
  • the above sensor 1 is attached directly to the washing machine 2 either in a removable or non-removable manner by means of a force-locking, form-locking, or material joint, for example by gluing, riveting, screwing, etc.
  • the placement of the sensor 1 on the body 4 in the immediate vicinity of the support legs 3 also enables the indirect determination of the natural frequencies of the washing machine 2 in addition to force measurements.
  • the value of the maximum force at a given frequency of the drum of the washing machine 2 corresponds to the value of the natural frequency of the washing machine 2.
  • the washing drum of said washing machine 2 must be placed in the washing tub in such a way that it can rotate around an approximately horizontal axis.
  • the word user refers to both the end user of the washing machine 2 and an advanced user, such as a service technician of the washing machine 2.
  • the dynamic properties of the washing machine 2 are determined, including the base on which it is placed.
  • Calibration is based on measuring the deformations on the lower part of the body 4 of the washing machine 2, whereby the deformations near at least one of the support legs 3 are measured.
  • the measurement of deformations is performed using at least one sensor 1, for example with a polymer strain gauge, which directly generates a response in the form of stress during deformation. Compared to the resistance strain gauge, it requires neither the use of additional electronic power supply components nor the final amplification of the signal from the aforementioned sensor 1.
  • the stress signal from at least one sensor 1 can be directly integrated into the existing electronic components of the washing machine 2. All necessary recalculations are performed with the processing power of the aforementioned existing electronic components.
  • the sensor 1 can also be mounted on the body 4 of the washing machine 2 indirectly by means of an additional holder, so that the sensor 1 is placed on an additional holder by an adhesion process, after which the sensor and additional holder assembly is mounted on the body 4 of the washing machine 2 by means of a force-locking, form-locking, or material joint.
  • the method according to the invention provides that the calibration for determining the natural frequencies of the washing machine 2 is performed when it is installed for the end user.
  • the quality of the base on which the washing machine 2 is placed is evaluated based on the calibration. It is also possible to detect any incorrect placement of the support legs 3 of the washing machine 2 based on an algorithm.
  • This algorithm refers to characteristic resonance ranges, which primarily occur in the case that the washing machine is mainly in contact with the ground only through three support legs 3.
  • the critical operating ranges are evaluated with this algorithm.
  • the washing mode is actively adjusted to avoid operation in critical ranges.
  • the torque on the motor of the washing machine 2 it is possible to detect dynamic loads in the drum of the washing machine 2.
  • the calibration of the washing machine 2 is carried out in such a way that transport locks 2a, which are intended to prevent damage to the washing machine 2 during transport, are first removed. After placement in the intended place, the washing machine 2 is connected to the water, drain, and electrical connection.
  • the processing unit of the washing machine proposes to perform the appliance calibration procedure via the display unit.
  • the display of the proposal appears due to the state of the display unit preset by the washing machine 2 manufacturer.
  • the display unit shows the symbol for inserting intended load means 2b into the drum of the washing machine 2 (shown in Fig. 6b by a dashed line).
  • the load means 2b must assume the intended position in relation to the inside of the drum when inserted into the drum or during the calibration programme. This is achieved, for example, in such a way that the load means 2b comprise fastening points which coincide with the receiving means in the drum of the washing machine 2.
  • the load means is of such a shape that, when inserted into the drum or during its rotation at a circumferential speed at which the centrifugal force at the centre of gravity of the load means 2b is greater than the weight force thereof, they assume a precisely defined position inside the drum of the washing machine 2. From an economical point of view, it is particularly advantageous if the load means 2b is an integral part of the transport locks 2a.
  • FIG 6 shows an embodiment where the load means 2b are part of the transport locks 2a. After inserting the load means 2b into the drum, the user closes the door of the washing machine 2 and starts the calibration by pressing the start button. Of course, communication between the user and the washing machine 2 is also possible in some other known way, such as by voice communication.
  • the rotational speed of the drum of the washing machine 2 is automatically increased from the idle state to the final number of revolutions with constant acceleration during the calibration by means of the calibration programme, which is part of the aforementioned algorithm and which includes the course of the angular speed of the electric motor as a function of time.
  • the signal from the at least one sensor 1 is read and the equivalent force on the base on which the washing machine 2 is placed is recalculated. Both the signal reading and the recalculation use the existing processing power of the washing machine 2, which is merely programmatically upgraded by the aforementioned algorithm, but this is not the subject of the present invention.
  • the result of the calibration is a characteristic curve 5, which gives the absolute amplitude of the force transfer to the base ( Fig. 2 ).
  • a dedicated algorithm deciphers the natural frequencies 5', 5" of the washing machine 2.
  • the values of the natural frequencies 5', 5" are stored in the settings of the washing machine 2, where they remain as default values until the next calibration.
  • the aforementioned algorithm is switched on by the user, and the usual washing mode or silent mode is available. Here, the user is informed that the final spinning speeds may be different from those set under the washing mode.
  • the so-called silent calibration of the washing machine 2 takes place so that the deformations of the body 4 of the washing machine 2 are measured and the natural frequencies 5', 5" are identified.
  • the values of natural frequencies 5', 5" relative to the washing cycles are recorded in the memory of the washing machine 2, and depending on any changes in the values of natural frequencies 5', 5", the user is informed that the calibration process must be restarted.
  • the reason for changing the natural frequencies 5', 5" can include loose joints in the components of the washing machine 2, a movement of the washing machine 2, a possible unscrewing of the support legs 3, etc.
  • the condition of the washing machine 2 is monitored during its entire service life with the aforementioned silent calibration.
  • the result of the performed calibration procedure are the values of the natural frequencies 5', 5" of the washing machine 2 on a given base.
  • the algorithm for detecting the quality of the base gives at least three reference values of the natural frequencies 5', 5", which are determined by the manufacturer of the washing machine 2 under ideal conditions. These reference values of natural frequencies are as follows:
  • the natural frequency range between f min and f max is divided into a set of classes, preferably five. Based on the range in which the measured natural frequency 5', 5" of the washing machine 2 is located, it is possible to identify the quality of the base. If the washing machine 2 is inadequately supported, this is detected when the natural frequency 5', 5" of the washing machine 2 is close to the natural frequency f3. In this case, the algorithm warns the user that the washing machine 2 is not placed correctly and that it is necessary to start the calibration procedure again.
  • the active adjustment of the washing cycle according to the quality of the base is aimed at a quieter and smoother operation of the washing machine 2.
  • the concept is based on the identified natural frequencies 5', 5" within the calibration procedure.
  • the user deliberately selects the smooth and quiet mode of the washing machine 2 by pressing the appropriate button.
  • the user is informed that, due to the modified mode of operation of the washing machine 2, the rotational speed of the washing drum in the spinning phase may be slightly different from the selected rotational speed within the washing programme.
  • the aforementioned algorithm for actively adjusting the washing mode comprises the following steps.
  • the weighting of the characteristic curve 5 is performed, preferably dividing the amplitudes by the square of the rotational frequency of the washing drum. From the weighted characteristic curve 6, the natural frequencies 5', 5" and corresponding normalised amplitudes are automatically identified via the aforementioned algorithm ( Fig. 4 ).
  • the critical operating ranges are the washing drum rotational frequencies where the response amplitude reached X max of the maximum amplitude of one of the aforementioned natural frequencies 5', 5" ( Fig. 5 ).
  • the frequency ranges suitable for operation are those frequency ranges where the amplitude is lower than X min .
  • the adjustment of the washing cycle is performed at rotational speeds higher than 400 rpm.
  • the adjustment of the washing cycle is preferably carried out in the spinning phase as follows:
  • the detection of dynamic loads is based on the current detection of deformations from the at least one sensor 1 in conjunction with the identification of the torque of the electric motor.
  • the dynamic load is characterised by the fact that it results in zero eccentricity, so it cannot be detected using the torque of the electric motor.
  • by measuring the deformations on the body 4 it is possible to detect an increased level of vibrations that occurs in the presence of such deviation and exceptional loads.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP20206599.1A 2019-11-11 2020-11-10 Verfahren zur eigenfrequenzerfassung in einer trommelwaschmaschine Active EP3819417B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI201900218A SI25920A (sl) 2019-11-11 2019-11-11 Postopek zaznavanja lastnih frekvenc pri pralnem stroju z bobnom

Publications (2)

Publication Number Publication Date
EP3819417A1 true EP3819417A1 (de) 2021-05-12
EP3819417B1 EP3819417B1 (de) 2023-01-11

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6401284B1 (en) 2000-04-04 2002-06-11 Lg Electronics Inc. Method for controlling washing during spinning in tilt-type washing machine for attenuation of vibration
WO2014004328A1 (en) 2012-06-25 2014-01-03 Illinois Tool Works Inc. Control mechanism for washing machine drive with acceleration sensing
US20150128357A1 (en) * 2013-11-11 2015-05-14 Dongbu Daewoo Electronics Corporation Apparatus and method for controlling washing machine
DE102015106849A1 (de) 2015-05-04 2016-11-10 Miele & Cie. Kg Waschmaschine mit einem Beschleunigungssensor und Verfahren zum Betreiben einer Waschmaschine
US20170241064A1 (en) * 2016-02-18 2017-08-24 Whirlpool Corporation Laundry treating appliance and method of control

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5101645A (en) * 1991-04-18 1992-04-07 Speed Queen Company Suspension system for automatic washing machine
DE60013791T3 (de) * 2000-06-30 2008-01-24 Whirlpool Corp., Benton Harbor Verfahren zur Detektion und zur Kontrolle einer dynamischen Unwucht in der Trommel einer Waschmaschine und Waschmaschine zur Durchführung dieses Verfahrens
JP3914514B2 (ja) * 2003-05-21 2007-05-16 日立アプライアンス株式会社 洗濯機
JP7061754B2 (ja) * 2016-12-27 2022-05-02 青島海爾洗衣机有限公司 洗濯機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6401284B1 (en) 2000-04-04 2002-06-11 Lg Electronics Inc. Method for controlling washing during spinning in tilt-type washing machine for attenuation of vibration
WO2014004328A1 (en) 2012-06-25 2014-01-03 Illinois Tool Works Inc. Control mechanism for washing machine drive with acceleration sensing
US20150128357A1 (en) * 2013-11-11 2015-05-14 Dongbu Daewoo Electronics Corporation Apparatus and method for controlling washing machine
DE102015106849A1 (de) 2015-05-04 2016-11-10 Miele & Cie. Kg Waschmaschine mit einem Beschleunigungssensor und Verfahren zum Betreiben einer Waschmaschine
US20170241064A1 (en) * 2016-02-18 2017-08-24 Whirlpool Corporation Laundry treating appliance and method of control

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Publication number Publication date
SI25920A (sl) 2021-05-31
EP3819417B1 (de) 2023-01-11

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