EP2662014A1 - Verfahren zur Beladungserkennung in einem Geschirrspülerkorb - Google Patents

Verfahren zur Beladungserkennung in einem Geschirrspülerkorb Download PDF

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Publication number
EP2662014A1
EP2662014A1 EP12167717.3A EP12167717A EP2662014A1 EP 2662014 A1 EP2662014 A1 EP 2662014A1 EP 12167717 A EP12167717 A EP 12167717A EP 2662014 A1 EP2662014 A1 EP 2662014A1
Authority
EP
European Patent Office
Prior art keywords
dishwasher
level
load
vibrations
vibration
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.)
Withdrawn
Application number
EP12167717.3A
Other languages
English (en)
French (fr)
Inventor
Maurizio Ugel
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP12167717.3A priority Critical patent/EP2662014A1/de
Priority to PCT/EP2013/059409 priority patent/WO2013167543A1/en
Publication of EP2662014A1 publication Critical patent/EP2662014A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0044—Operation time reduction
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0047—Energy or water consumption, e.g. by saving energy or water
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4295—Arrangements for detecting or measuring the condition of the crockery or tableware, e.g. nature or quantity
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2301/00—Manual input in controlling methods of washing or rinsing machines for crockery or tableware, i.e. information entered by a user
    • A47L2301/06—Crockery or tableware details, e.g. material, quantity, condition
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/04—Crockery or tableware details, e.g. material, quantity, condition
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/32—Vibration or sound detection
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/30—Regulation of machine operational steps within the washing process, e.g. performing an additional rinsing phase, shortening or stopping of the drying phase, washing at decreased noise operation conditions

Definitions

  • the present invention relates to a method for detecting the amount and distribution of the load within a dishwasher and to a dishwasher which is adapted to perform such method.
  • EP-A-0943 287 it was suggested to provide in a dishwasher for a transmitter/receiver pair, such as for transmitting and receiving ultrasonic waves, wherein based on the time required for an ultrasonic signal to be transmitted from the transmitter to the receiver an evaluation shall be made as regards the amount of articles that are provided within the washing tub.
  • a further method for load monitoring of a dishwasher basket is described in DE-A-102 04 455 wherein it is suggested to record typical sound patterns that are created during operation of a dishwasher and to compare such sound patterns with a plurality of previously stored typical sound patterns which are recorded in advance for various parts of a washing cycle carried out in the dishwasher as well as for different load distributions within the dishwasher. By determining whether an instantaneous sound pattern can be regarded as similar to any of the pre-stored sound patterns, it thus shall be possible to make conclusions as regards the load distributions.
  • a dish washer that comprises an acoustic detector, such as a capacitor or electret-type microphone transmitter, which is adapted to generate an information signal in response to the noise generated in the washing vessel of the machine during operation thereof.
  • a processor performs a multiresolution analysis of the detector signals, i.e. it decomposes the signals so as to enable a thorough analysis to be performed, so as to evaluate the type and amount of items loaded in the machine.
  • a further document that suggests providing for a frequency analysis for load detection purposes is DE-A-100 48 085 , which describes a method for load detection in a dishwasher in which method the impingement onto the wall of the jets ejected from the spray arms is detected in terms of amplitude and frequency.
  • the method suggested herein makes use of the recognition that different load distributions in a dishwasher not only results in different spectral sound patterns but rather that different load distributions can be differentiated also by the overall level of the detected vibrations.
  • the amount and distribution of the load within the dishwasher can be determined simply by detecting the level of vibrations that are generated during operation of the dishwasher and comparing the thus detected level with the entries in the look-up table.
  • the step of preliminarily detecting the level of vibrations generated during operation of the dishwasher for a plurality of different load distributions, and preparing a look-up table which assigns individual ranges of vibration levels to each load distribution generally can be carried out by the manufacturer of the dishwasher, the look-up table also could be prepared and/or modified by self-learning techniques that are carried out during operation of the dishwasher.
  • the minimum and maximum level of vibrations generated during operation of the dishwasher can be repeatedly measured and a predefined load function is fitted to the thus measured minimum and maximum values.
  • the thus detected minimum vibration level can be assigned to the fully loaded state of the dishwasher, and the thus detected maximum vibration level can be assigned to the empty state of the dishwasher.
  • a pre-shaped load function in the most simple case, a linear curve, can be fitted to the thus detected minimum and maximum values so as to provide for an estimated load value for any vibration level in between the minimum and maximum values, which intermediate values thus can be easily calculated to prepare the look-up table.
  • the look-up table can be prepared and/or modified by self-learning techniques that do not rely on any user input by determining the minimum and the maximum of the detected vibration level, and then fitting a pre-shaped non-linear load curve through such minimum and maximum values.
  • an assignment scheme such as an assignment function or an assignment table, can be stored in the controller of the dishwasher, which assignment scheme assigns a certain load to a predefined percentage of the maximum vibration level or the range of vibrations to be expected.
  • the range of the vibration levels to be expected during operation of the dishwasher can be detected by calculating the difference between the detected maximum vibration level and the detected minimum vibration level.
  • load values are assigned to given percentages of the thus determined range so as to prepare the look-up table.
  • the amount and the distribution of the load then can be an estimated simply by comparing the instantaneously detected vibration level with the entries in the thus prepared look-up table.
  • the dishwasher can be provided with input means by which the user when starting a washing cycle can input the instantaneous load distribution, such as by inputting a number that is representative for one of a plurality of predefined load distributions, such as "full - 1", “upper basket full, lower basket half full - 2", “upper basket half full, lower basket partially loaded - 3", “upper basket half full, lower basket empty - 4" etc.
  • the level of vibrations then is detected and the transfer function adapted accordingly, such as by making a respective entry in the look-up table. In this manner the method is able to repeatedly adapt the transfer function so as to further improve the accuracy of the assignment of the ranges of vibration levels to the respective load distributions.
  • the method can be designed such that in the step of preliminarily detecting the level of vibrations generated during operation of the dishwasher for a plurality of different load distributions, and preparing a transfer function or look-up table which assigns individual ranges of vibration levels to each load distribution, the vibration levels are determined by calculating an average of the level of the vibrations detected over a predetermined period of time.
  • the level of the vibrations is detected using a vibration sensor which outputs a voltage signal that is proportional to the level of vibrations.
  • a vibration sensor thus could be a piezoelectric shock sensor which produces a voltage output signal that is substantially proportional to the acceleration of the sensor caused by a mechanical vibration of the sensor, i.e. an output signal that is substantially proportional to impacts or vibrations to which the sensor is exposed.
  • the different load distributions for which preliminarily an individual range of vibration levels is assigned may include load distributions which differ in the amount, such as fully or partially loaded, placement, such as upper or lower basket or placement within certain regions of the baskets, such as left/right, front/back, basket floor or cup shelf etc., type, such as dishes, glasses, pots, etc., size and/or material, such as glass, ceramics or plastic, of the items provided within the dishwasher.
  • the dishwasher can automatically adapt the washing cycle.
  • the dishwasher may be operated with a shorter or less intensive washing cycle, in which manner savings in time, energy and water can be achieved.
  • the present invention is a dishwasher adapted to carry out the above process, and in particular a dishwasher comprising a washing tub for accommodating articles to be cleaned, at least one spray arm arranged within the washing tub for directing a cleaning fluid to the articles to be cleaned, and a vibration sensor for detecting vibrations generated during operation of the dishwasher, wherein the dishwasher further comprises means for load detection, which means is adapted to carry out the method described above.
  • the vibration sensor comprises a piezoelectric shock sensor.
  • a piezoelectric shock sensor produces a voltage output signal that is substantially proportional to the acceleration of the sensor caused by a mechanical vibration of the sensor, i.e. an output signal that is substantially proportional to impacts or vibrations to which the sensor is exposed.
  • the vibration sensor is attached to the exterior side of the tub so that the sensor is located outside the wet zone of the dishwasher. In this manner it is not necessary to take any specific precautions to avoid contact of electrically driven sensor components with the cleaning liquid that is circulated through the dishwasher tub.
  • Preferred locations for the vibration sensor are at a side wall of the tub or even further preferred at a top wall of the tub.
  • the vibration sensor preferably is attached to the exterior side of the tub by a substantially rigid connection, such as by gluing the vibration sensor directly to the exterior side of the tub.
  • FIG. 1 shows a perspective view of a dishwasher made in accordance with the present invention:
  • Dishwasher 10 comprises a washing compartment 12 which is accessible via a front door 14.
  • Within washing compartment 12 there are arranged an upper basket 16 and a lower basket 18 which, for loading and unloading purposes, can be moved into and out of the washing compartment 12 in a drawer-like manner.
  • a rotatable spray arm 22 which comprises a plurality of spraying nozzles which eject water jets towards the baskets 16 and 18. While not shown in FIG.
  • dishwasher 10 further can be equipped with additional spray arms, such as a spray arm which is rotatably supported below upper basket 16 as well as an optional additional spray arm that is rotatably supported at the roof 24 of washing compartment 12.
  • additional spray arms such as a spray arm which is rotatably supported below upper basket 16 as well as an optional additional spray arm that is rotatably supported at the roof 24 of washing compartment 12.
  • control panel 26 which comprises a plurality of control elements 28, such as buttons and the like, as well as a display element 30.
  • the individual components of control panel 26 are connected to a central control unit 34 which controls all the various components of the dishwasher such as the water feed system including a circulation pump which feeds water to the spray arms, a drain pump for draining sump 20, a heating system for heating the cleaning fluid, a detergent dispensing system, and the like.
  • dishwasher 10 In order to detect vibrations which are generated within the washing compartment 12 during operation of the dishwasher 10, a vibration sensor 36 is attached to the exterior of the top wall 36 of the washing compartment 12. Vibration sensor 36 likewise is connected to the central control unit 34.
  • dishwasher 10 further comprises a plurality of input elements 32 by means of which a user can provide input data, such as data as regards the load distribution within the upper and the lower baskets 16 and 18, to the central control unit 34.
  • FIGS. 2 to 6 illustrate voltage signals which are provided by vibration sensor 36 during operation of the dishwasher with different load distributions.
  • the voltage signals shown in FIGS. 2 to 6 were obtained with a dishwasher 10 in which a piezoelectric shock sensor was used as vibration sensor 36.
  • Such piezoelectric shock sensors which usually comprise an unimorph diaphragm which consists of a piezoelectric ceramic disk that is laminated to a metal disk, which diaphragm is supported along its circumference within a housing, are readily available in the art.
  • Piezoelectric shock sensor 36 when exposed to vibrations, produces a voltage signal that is proportional to the acceleration of the sensor that is caused by the vibrations.
  • FIG. 2 shows the voltage signal obtained from vibration sensor 36 when both be upper basket 16 and the lower basket 18 were fully loaded.
  • FIG. 3 illustrates the voltage signal that was obtained when both the upper basket 16 and the lower basket 18 were loaded, wherein however less articles were loaded than during full load.
  • FIGS. 4 and 5 show the voltage signals obtained from vibration sensor 36 when an increasing number of articles were removed from the baskets 16 and 18 which thus were only partially loaded.
  • FIG. 6 shows the voltage signal obtained from vibration sensor 36 when the baskets were empty.
  • the voltage signal obtained for different load distributions here for different amounts of load placed within baskets 16 and 18, distinctively differs in amplitude.
  • an average of the level of vibrations over the sampling periods can be calculated and subsequently can be used as a reference value which is indicative for a certain load distribution.
  • each different load distribution is assigned an individual range for the average value, which ranges are stored in a look-up table.
  • the instantaneous load distribution within dishwasher 10 can be determined by detecting the level of vibrations by means of vibration sensor 36 and comparing the thus detected level with the entrees in the look-up table.
  • the central control unit 34 is provided with a self learning capacity for the look-up table stored therein, wherein the user, before starting a washing cycle, can provide the central control unit 34 via the input elements 32 with input data as regards the actual load distribution, wherein during the then following washing cycle the vibration sensor 36 provides for a vibration signal which is assigned to the input data that have been provided by the user.
  • Such input data can be indications as regards amount, placement, type, size and/or material of the items that have been loaded into the baskets, wherein the choice of individual parameters to be inputted via the input elements 32 can be laid down in the instruction manual of the dishwasher 10, or can be indicated at the display element 30.
  • the individual parameters such as amount, placement, type, size and material of the items provided within the dishwasher can be inputted one after another. In this manner, the machine can automatically adapt the washing cycles carried out in the dishwasher to the personal needs of the user.
  • FIG. 7 illustrates an example of a load curve that can be used in preparing a transfer function or look-up table without user input.
  • the controller is set to repeatedly measure the minimum and the maximum level of vibrations generated during operation of the dishwasher. That is, in a very basic implementation, the controller stores the lowest and the highest level of vibrations measured during operation of the dishwasher. Cycle by cycle, the controller measures the level of vibrations of the washing cycle carried out in the dishwasher and checks if it is lower or higher than the maximum and minimum stored values. In case it is lower or higher the memory is updated accordingly. Having determined the maximum and minimum vibration levels, a predefined load function is fitted to the thus measured minimum and maximum vibration levels.
  • the controller adopts a linear interpolation between the maximum to and the minimum to assign any determined level of vibrations V meas to an estimated amount of load L est .
  • FIG. 8 illustrates an example of a non-linear load curve used for preparing a transfer function or look-up table without manual user input. While in general, there is no linear relationship between the level of vibrations generated during operation of the dishwasher and the amount and distribution of the load, by using a non-linear load curve there can be provided for a more accurate approximation of the amount and the distribution of the load.
  • the minimum and maximum vibration levels are determined, and, by calculating the difference between the detected maximum vibration level MAX and the detected minimum vibration level MIN, the range of the vibration levels to be expected during operation of the dishwasher is determined.
  • a number of intermediate load values are assigned to certain percentaged values of the vibration range.
  • a load level L 0 is assigned to a value of 88% of the vibration range (MAX - MIN)
  • a load level L 1 is assigned to a value of 70% of the vibration range
  • a load level L 2 is assigned to a value of 54% of the vibration range
  • a load level L 3 is assigned to a value of 34% of the vibration range
  • a load level L 4 is assigned to a value of 20% of the vibration range
  • a load level L 5 is assigned to a value of 10% of the vibration range.
  • the assignment scheme used in this example provides for a curved concave interpolation curve.
  • any shape of curve can be pre-defined and fitted to the minimum and vibration levels which are repeatedly detected during operation of the dishwasher.
EP12167717.3A 2012-05-11 2012-05-11 Verfahren zur Beladungserkennung in einem Geschirrspülerkorb Withdrawn EP2662014A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12167717.3A EP2662014A1 (de) 2012-05-11 2012-05-11 Verfahren zur Beladungserkennung in einem Geschirrspülerkorb
PCT/EP2013/059409 WO2013167543A1 (en) 2012-05-11 2013-05-06 Method for load detection in a dishwasher basket

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12167717.3A EP2662014A1 (de) 2012-05-11 2012-05-11 Verfahren zur Beladungserkennung in einem Geschirrspülerkorb

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015036040A1 (en) * 2013-09-13 2015-03-19 Electrolux Appliances Aktiebolag Determining operational states of a dishwasher
WO2015197139A1 (en) 2014-06-27 2015-12-30 Electrolux Appliances Aktiebolag Dishwasher and method of operating the dishwasher
WO2020002395A1 (de) * 2018-06-27 2020-01-02 Henkel Ag & Co. Kgaa Überwachung einer be- und/oder entladung von geschirrspülmaschinen
CN110702217A (zh) * 2019-11-15 2020-01-17 日本电产科宝(浙江)有限公司 噪音检测设备
CN112110116A (zh) * 2020-09-07 2020-12-22 上海擎朗智能科技有限公司 一种置物柜和用具回收系统
US20210204791A1 (en) * 2018-06-27 2021-07-08 Henkel Ag & Co. Kgaa Monitoring of a washing program of a dishwasher machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017108096A1 (en) * 2015-12-22 2017-06-29 Arcelik Anonim Sirketi A dishwasher and a method for the detection of the load in a rack of such dishwasher

Citations (8)

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Publication number Priority date Publication date Assignee Title
EP0793939A1 (de) 1996-03-04 1997-09-10 ZELTRON S.p.A. Waschmaschine
EP0943287A1 (de) 1998-03-20 1999-09-22 AEG Hausgeräte GmbH Geschirrspülmaschine und Verfahren zum Betreiben derselben
DE19828871A1 (de) * 1998-06-25 1999-12-30 Bsh Bosch Siemens Hausgeraete Wasserführendes Haushaltgerät
DE29919445U1 (de) * 1999-11-05 2001-03-29 Aeg Hausgeraete Gmbh Geschirrspülmaschine mit einem Spülbehälter
DE10048085A1 (de) 2000-09-28 2002-04-18 Miele & Cie Verfahren zur Erkennung der Beladung einer programmgesteuerten Geschirrspülmaschine mit Spülgut und Geschirrspülmaschine zur Durchführung des Verfahrens
DE10204455A1 (de) 2002-02-05 2003-08-21 Miele & Cie Verfahren zur Beeinflussung und/oder Steuerung des Programmlaufs eines wasserführenden Haushaltgerätes, insbesondere Geschirrspülmaschine, sowie Geschirrspülmaschine zur Durchführung des Verfahrens
EP1779762A1 (de) * 2005-10-27 2007-05-02 Electrolux Home Products Corporation N.V. Netzwerk von programmgesteuerten Haushaltsgeräten
US20120097199A1 (en) * 2010-10-20 2012-04-26 Whirlpool Corporation Dishwasher with wash load detection

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0793939A1 (de) 1996-03-04 1997-09-10 ZELTRON S.p.A. Waschmaschine
EP0943287A1 (de) 1998-03-20 1999-09-22 AEG Hausgeräte GmbH Geschirrspülmaschine und Verfahren zum Betreiben derselben
DE19828871A1 (de) * 1998-06-25 1999-12-30 Bsh Bosch Siemens Hausgeraete Wasserführendes Haushaltgerät
DE29919445U1 (de) * 1999-11-05 2001-03-29 Aeg Hausgeraete Gmbh Geschirrspülmaschine mit einem Spülbehälter
DE10048085A1 (de) 2000-09-28 2002-04-18 Miele & Cie Verfahren zur Erkennung der Beladung einer programmgesteuerten Geschirrspülmaschine mit Spülgut und Geschirrspülmaschine zur Durchführung des Verfahrens
DE10204455A1 (de) 2002-02-05 2003-08-21 Miele & Cie Verfahren zur Beeinflussung und/oder Steuerung des Programmlaufs eines wasserführenden Haushaltgerätes, insbesondere Geschirrspülmaschine, sowie Geschirrspülmaschine zur Durchführung des Verfahrens
EP1779762A1 (de) * 2005-10-27 2007-05-02 Electrolux Home Products Corporation N.V. Netzwerk von programmgesteuerten Haushaltsgeräten
US20120097199A1 (en) * 2010-10-20 2012-04-26 Whirlpool Corporation Dishwasher with wash load detection

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015036040A1 (en) * 2013-09-13 2015-03-19 Electrolux Appliances Aktiebolag Determining operational states of a dishwasher
WO2015197139A1 (en) 2014-06-27 2015-12-30 Electrolux Appliances Aktiebolag Dishwasher and method of operating the dishwasher
CN106455900A (zh) * 2014-06-27 2017-02-22 伊莱克斯电器股份公司 洗碗机以及操作洗碗机的方法
US20170119232A1 (en) * 2014-06-27 2017-05-04 Electrolux Appliances Aktiebolag Dishwasher and method of operating the dishwasher
CN106455900B (zh) * 2014-06-27 2019-10-18 伊莱克斯电器股份公司 洗碗机以及操作洗碗机的方法
US11076742B2 (en) 2014-06-27 2021-08-03 Electrolux Appliances Aktiebolag Dishwasher and method of operating the dishwasher
US20210204791A1 (en) * 2018-06-27 2021-07-08 Henkel Ag & Co. Kgaa Monitoring of a washing program of a dishwasher machine
CN112334052A (zh) * 2018-06-27 2021-02-05 汉高股份有限及两合公司 洗碗机的装载和/或卸载的监控
WO2020002395A1 (de) * 2018-06-27 2020-01-02 Henkel Ag & Co. Kgaa Überwachung einer be- und/oder entladung von geschirrspülmaschinen
US11547270B2 (en) 2018-06-27 2023-01-10 Henkel Ag & Co. Kgaa Monitoring of loading and/or unloading of dishwasher machines
CN110702217A (zh) * 2019-11-15 2020-01-17 日本电产科宝(浙江)有限公司 噪音检测设备
CN110702217B (zh) * 2019-11-15 2021-07-27 日本电产科宝(浙江)有限公司 噪音检测设备
CN112110116A (zh) * 2020-09-07 2020-12-22 上海擎朗智能科技有限公司 一种置物柜和用具回收系统

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