EP1701646A1 - Geschirrspülmaschine mit einem system zur füllstandserkennung - Google Patents
Geschirrspülmaschine mit einem system zur füllstandserkennungInfo
- Publication number
- EP1701646A1 EP1701646A1 EP04804785A EP04804785A EP1701646A1 EP 1701646 A1 EP1701646 A1 EP 1701646A1 EP 04804785 A EP04804785 A EP 04804785A EP 04804785 A EP04804785 A EP 04804785A EP 1701646 A1 EP1701646 A1 EP 1701646A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- level
- dishwasher
- level sensor
- liquid
- dishwasher according
- 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
Links
- 239000007788 liquid Substances 0.000 claims description 71
- 238000005406 washing Methods 0.000 claims description 35
- 238000001514 detection method Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000012790 adhesive layer Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract 5
- 239000003990 capacitor Substances 0.000 description 10
- 238000011010 flushing procedure Methods 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005293 physical law Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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
- A47L15/42—Details
- A47L15/4244—Water-level measuring or regulating arrangements
Definitions
- the present invention relates to a dishwasher with a system for detecting the liquid level of the washing liquid contained in the dishwasher.
- Dishwashers with devices for level detection are known, in which the liquid level is detected by mechanical means, for example by swimmers.
- the float floats on the liquid surface as soon as the liquid level in the dishwasher exceeds a certain level.
- the float is usually connected to a mechanical microswitch which changes its switching state due to the floating movement of the float and forwards a corresponding signal to the program control of the dishwasher.
- malfunctions often occur if, for example, the switching switch is not reliably guaranteed due to an insufficient current load on the microswitch contacts, which leads to inadequate switching behavior.
- floats can be raised by air bubbles rising in the rinsing liquid and the microswitch can thus be actuated without the desired liquid level actually being present.
- a pressure can is used which is compressed as the liquid level rises.
- the liquid level in the dishwasher can be determined from the extent of the compression of the pressure cell.
- the object of the present invention is to provide a dishwasher with a system for level detection at low manufacturing costs, which reliably determines the liquid level in the dishwasher without the need for moving parts.
- the dishwasher according to the invention comprises at least one washing container for receiving items to be cleaned and a system for detecting the liquid level of the washing liquid contained in the dishwasher, at least one capacitive fill level sensor being provided, the electrical capacity of which changes on contact with the washing liquid.
- An advantage of the dishwasher according to the invention is that in the system for filling level detection according to the invention, the previously conventional mechanical microswitches are replaced by a purely electronic sensor system, as a result of which problems due to insufficient switching currents and the switching uncertainties caused by them are eliminated. A malfunction caused by vibration or foamed rinsing liquid cannot occur in the capacitive detection of the liquid level according to the present invention. As a result, the system according to the invention is more stable and delivers more reproducible results than the known systems for level detection.
- a further advantage of the dishwasher according to the invention can be seen in the fact that previously necessary moving components are saved, as a result of which both the assembly effort and thus the manufacturing costs are reduced and the failure rate is reduced as a result of the reduction in components. Since the liquid level is determined without moving parts and solely by the use of electronic components, the liquid level in the dishwasher, the system according to the invention for detecting the liquid level is largely unaffected by wear and contamination due to deposited washing residues. Since no more space has to be taken into account for mechanical devices, a further advantage of the system according to the invention for detecting the liquid level can be seen in the fact that it takes up very little space and can therefore be accommodated in inaccessible places in the dishwasher almost as desired.
- the washing liquid used in dishwashers corresponds to a solution mixed with cleaning agents, which consists essentially of water.
- This clear difference L between the dielectric constants of water and air is used as the physical basis in the system for level detection according to the present invention 200301781
- the fill level sensor is designed in the manner of a capacitor, the electrical capacitance of which changes as a function of the level of the liquid.
- the change in the electrical capacitance of the capacitive level sensor is based on the physical law that the electrical capacitance of a capacitor - in addition to the capacitor area and its distance from one another - depends on the dielectric constant of the medium or of the dielectric which is in the electromagnetic field, that forms between the capacitor surfaces.
- the factor of the dielectric constant ⁇ also changes. Since the other factors of the above equation remain unchanged, the capacitance of the capacitive level sensor changes in direct proportion to the change in the dielectric constant of the dielectric. In a preferred embodiment of the present invention, the electrical capacitance of the fill level sensor therefore changes as a function of the dielectric constant of the medium surrounding the fill level sensor.
- a level sensor which represents only one capacitor area, while the other capacitor area is represented by the surroundings of the level sensor.
- At least two level sensors are provided, between which a circuit closes as soon as the level sensors come into contact with the rinsing liquid at the same time. It is sufficient if this circuit is only supplied with chess current.
- the different electrical conductivity of water and air is a sure differentiator 200301781
- level sensors are surrounded by air or water, i.e. whether the level of the washing liquid in the dishwasher has reached a certain level or not.
- the system for level detection additionally has electronic means which preferably captures the electrical capacity or the electrical conductivity of the level sensor and their change qualitatively and quantitatively.
- the quantitative recording of the change in the electrical capacitance or the electrical conductivity of the level sensor not only records the reaching, exceeding or falling below a certain liquid level, but preferably also the exact level of the liquid level.
- Such an electrical circuit can be implemented particularly practically in the form of one or more integrated circuits, which are inexpensive to manufacture and require little space.
- one or more integrated circuits can be provided which are capable of evaluating the signals from a plurality of active sensor areas.
- the area of the level sensor that comes into contact with the rinsing liquid can have any shape.
- a qualitative determination of the liquid level by means of a single fill level sensor is favored, however, if the surface of the fill level sensor which comes into contact with the flushing liquid has an elongated, essentially rectangular shape. If a fill level sensor with a rectangular contact surface is arranged vertically in the washing container of the dishwasher, an increasing surface of the fill level sensor is covered with rinsing liquid as the liquid level rises. Due to the increasing contact area between the level sensor and the rinsing liquid, the electrical capacity of the level sensor is gradually changing. This change can be detected and evaluated by the electronic means connected to the level sensor in order to determine the exact liquid level therefrom.
- the capacitive fill level sensor is expediently arranged in the dishwasher in such a way that a specific liquid level in the dishwasher or whether the liquid level exceeds or falls below this level can be determined by the fill level sensor. It is also possible to assign gradations of the change in capacity of the level sensor to certain liquid levels of the washing liquid in the dishwasher, so that not only does the liquid level exceed or fall below certain levels, but also the exact level of the liquid level in the dishwasher's washing container with the aid of the invention. 200301781
- system with capacitive level sensor can be determined.
- one or more level sensors can be arranged at a certain height in the washing compartment.
- a liquid level that is too high or too low in the washing container of the dishwasher can be detected by arranging a fill level sensor in the washing container at the level of a maximum and / or a minimum liquid level.
- the system for level detection therefore comprises a plurality of level sensors, de at the level of certain liquid levels, e.g. the level and the safety level are arranged.
- a fill level sensor is arranged in the level of the determined level for optimal fill level and the safety level in the washing container. Due to the gradual change in the electrical capacity of the level sensor when the liquid level rises or falls and when corresponding reference values are available in electronic storage media, conclusions can be drawn about the current liquid level of the rinsing liquid in the rinsing tank by comparing the currently determined capacity of the level sensor with the stored reference values. In this way, several liquid levels can be monitored or controlled with only one level sensor.
- a fill level sensor can be arranged in the floor pan of the dishwasher in order to determine the wash liquid that has leaked out of the wash tank into the floor assembly.
- the fill level sensors can be arranged at almost any location on the dishwasher's washing container. A position which is extremely inaccessible to a mechanical solution or which is severely limited by the space requirement can thus also be selected. Furthermore, the shape of the active sensor surfaces themselves can be adapted to the spatial conditions of the relevant location in the dishwasher.
- the fill level sensor is preferably arranged inside the washing compartment at a location protected from splash water. This can prevent the determination of the liquid level in the dishwasher from being falsified by splash water which comes into contact with the fill level sensor during the washing operation.
- a fastening side of the level sensor is provided with a self-adhesive layer. As a result, the level sensor can be easily positioned, for example, on the wall of the rinsing container, without having to use it for screw fastenings or the like. to have to damage.
- FIG. 1 shows a schematic illustration of a system for level detection according to the present invention in a first preferred embodiment.
- the system shown for level detection comprises a level sensor 1, which is arranged at a certain height in the washing container of the dishwasher. As soon as the washing liquid has reached a certain height, it comes into contact with the level sensor 1, whereupon the level sensor 1 changes its electrical capacity.
- a second fill level sensor 2 is provided, which is arranged, for example, in the base group of the dishwasher. With the aid of the second fill level sensor 2, it can be determined whether flushing liquid has flowed from the flushing tank into the base assembly by the fill level sensor 2 changing its capacity when it comes into contact with flushing liquid.
- the level sensors 1 and 2 consist of electrically conductive material and are each connected via an electrical line to sensor electronics, which detects and evaluates the change in the electrical capacity of the level sensors.
- the sensor electronics comprise one or more integrated circuits, de on de 200301781
- both level sensors 1 and 2 are arranged in the washing compartment of the dishwasher and a low voltage is applied, so that a low-current circuit can also be closed between them as soon as both level sensors come into contact with washing liquid at the same time. In this way it can be determined whether the level of the washing liquid in the dishwasher has reached the level of the upper level sensor 1 or falls below its level again.
Landscapes
- Washing And Drying Of Tableware (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10360554A DE10360554A1 (de) | 2003-12-22 | 2003-12-22 | Geschirrspülmaschine mit einem System zur Füllstandserkennung |
PCT/EP2004/053422 WO2005060816A1 (de) | 2003-12-22 | 2004-12-13 | Geschirrspülmaschine mit einem system zur füllstandserkennung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1701646A1 true EP1701646A1 (de) | 2006-09-20 |
EP1701646B1 EP1701646B1 (de) | 2010-09-22 |
Family
ID=34673031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04804785A Active EP1701646B1 (de) | 2003-12-22 | 2004-12-13 | Geschirrspülmaschine mit einem system zur füllstandserkennung |
Country Status (6)
Country | Link |
---|---|
US (1) | US8161987B2 (de) |
EP (1) | EP1701646B1 (de) |
CN (1) | CN1897864A (de) |
AT (1) | ATE481917T1 (de) |
DE (2) | DE10360554A1 (de) |
WO (1) | WO2005060816A1 (de) |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006043973A1 (de) * | 2006-09-19 | 2008-03-27 | BSH Bosch und Siemens Hausgeräte GmbH | Wasserführendes Haushaltsgerät mit Reinigungsmitteldosiersystem |
US8532273B2 (en) * | 2008-04-29 | 2013-09-10 | Lg Electronics Inc. | Home appliance and home appliance system |
EP2277280A4 (de) * | 2008-04-29 | 2011-11-16 | Lg Electronics Inc | Hausgerät und hausgerätesystem |
KR101627219B1 (ko) * | 2008-04-29 | 2016-06-03 | 엘지전자 주식회사 | 가전기기 및 가전기기를 포함하는 가전기기시스템 |
US8705715B2 (en) * | 2008-04-30 | 2014-04-22 | Lg Electronics Inc. | Home appliance, home appliance system, and diagnosis method of a home appliance |
US9054953B2 (en) | 2008-06-16 | 2015-06-09 | Lg Electronics Inc. | Home appliance and home appliance system |
IT1391200B1 (it) * | 2008-09-30 | 2011-11-18 | Elbi Int Spa | Dispositivo per l'erogazione di almeno un agente di lavaggio in una macchina lavastoviglie |
US20100175718A1 (en) * | 2009-01-09 | 2010-07-15 | Electrolux Home Products, Inc. | Apparatus and associated method for controlling a washing fluid level in a dishwasher |
KR101597523B1 (ko) * | 2009-04-10 | 2016-02-25 | 엘지전자 주식회사 | 가전기기 서비스 장치 및 그 제어방법 |
KR101421685B1 (ko) * | 2009-04-10 | 2014-08-13 | 엘지전자 주식회사 | 가전기기 진단시스템 및 그 진단방법 |
KR101442115B1 (ko) * | 2009-04-10 | 2014-09-18 | 엘지전자 주식회사 | 가전기기 및 가전기기 시스템 |
US8565079B2 (en) * | 2009-04-10 | 2013-10-22 | Lg Electronics Inc. | Home appliance and home appliance system |
CN102474420B (zh) | 2009-07-06 | 2014-12-17 | Lg电子株式会社 | 家电诊断***及其操作方法 |
KR20110010374A (ko) * | 2009-07-24 | 2011-02-01 | 엘지전자 주식회사 | 가전기기 진단시스템 및 그 방법 |
KR101482137B1 (ko) * | 2009-07-31 | 2015-01-13 | 엘지전자 주식회사 | 가전기기 진단시스템 및 그 진단방법 |
KR101472402B1 (ko) * | 2009-07-31 | 2014-12-12 | 엘지전자 주식회사 | 가전기기 진단시스템 및 그 진단방법 |
KR101553843B1 (ko) * | 2009-07-31 | 2015-09-30 | 엘지전자 주식회사 | 가전기기 진단시스템 및 그 진단방법 |
KR101472401B1 (ko) * | 2009-07-31 | 2014-12-12 | 엘지전자 주식회사 | 가전기기 진단시스템 및 그 진단방법 |
KR20110013582A (ko) * | 2009-07-31 | 2011-02-10 | 엘지전자 주식회사 | 가전기기 진단시스템 및 그 진단방법 |
AU2010279835B2 (en) | 2009-08-05 | 2014-08-28 | Lg Electronics Inc. | Home appliance and method for operating the same |
KR101748605B1 (ko) | 2010-01-15 | 2017-06-20 | 엘지전자 주식회사 | 냉장고 및 냉장고 진단시스템 |
EP2592785B1 (de) | 2010-07-06 | 2015-02-18 | LG Electronics Inc. | Diagnosevorrichtung für haushaltsgeräte |
KR101416937B1 (ko) | 2011-08-02 | 2014-08-06 | 엘지전자 주식회사 | 가전기기, 가전기기 진단시스템 및 동작방법 |
KR101252167B1 (ko) | 2011-08-18 | 2013-04-05 | 엘지전자 주식회사 | 가전기기 진단장치 및 그 진단방법 |
WO2013163649A1 (en) * | 2012-04-27 | 2013-10-31 | Igralub North America, Llc | System and method for fleet wheel-rail lubrication and noise management |
KR101942781B1 (ko) | 2012-07-03 | 2019-01-28 | 엘지전자 주식회사 | 가전기기 및 가전기기 진단을 위한 신호음 출력방법 |
KR20140007178A (ko) | 2012-07-09 | 2014-01-17 | 엘지전자 주식회사 | 가전기기 및 그 시스템 |
DE102013002603A1 (de) * | 2013-02-15 | 2014-08-21 | AWECO Appliance Entwicklungs- und Engineering GmbH | Haushaltsmaschine |
CN106923770A (zh) * | 2017-02-22 | 2017-07-07 | 合肥舒实工贸有限公司 | 一种洗碗机的液位控制*** |
DE102017115516A1 (de) * | 2017-07-11 | 2019-01-17 | Endress+Hauser SE+Co. KG | Kapazitives Füllstandsmessgerät |
DE102019206978B4 (de) * | 2019-05-14 | 2020-12-17 | Meiko Maschinenbau Gmbh & Co. Kg | Geschirrspülmaschine zum Einsatz in einem Verkehrsmittel |
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US3539153A (en) * | 1966-07-18 | 1970-11-10 | Whirlpool Co | Electronic dishwasher control system with condition responsive cycling |
DE2106760A1 (de) * | 1970-02-13 | 1971-08-26 | Giambertoni N | Niveaufühler, insbesondere zur Verwendung von oberflächenaktiven Flüssigkeiten fur Geschirrspulmaschinen |
DE3014225C2 (de) * | 1980-04-14 | 1985-05-23 | Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart | Verfahren und Vorrichtung zum Füllen des Spül- bzw. Waschbehälters einer Geschirrspül- oder Waschmaschine |
EP0228217A1 (de) * | 1985-12-18 | 1987-07-08 | LUCAS INDUSTRIES public limited company | Flüssigkeitsstandanzeiger |
US4982606A (en) * | 1989-03-06 | 1991-01-08 | Raytheon Company | Fluid level sensor and controller |
DE4140949C2 (de) * | 1991-12-12 | 1996-07-11 | Aeg Hausgeraete Gmbh | Niveausteuerung für eine Geschirrspülmaschine |
DE4209582C2 (de) * | 1992-03-25 | 1998-07-16 | Aeg Hausgeraete Gmbh | Schutzeinrichtung gegen Überschwemmung |
DE19538580B4 (de) * | 1995-10-17 | 2008-07-24 | Köhler, Katharina | Verfahren zum Betreiben einer Geschirrspülmaschine |
DE19841694A1 (de) * | 1998-09-11 | 2000-03-16 | Bsh Bosch Siemens Hausgeraete | Verfahren zum Betreiben einer Haushalt-Geschirrspülmaschine und Haushalt-Geschirrspülmaschine zur Durchführung des Verfahrens |
DE19917191C2 (de) * | 1999-04-16 | 2002-08-08 | Preh Elektro Feinmechanik | Bedienelement zum Schalten und Steuern elektrisch bedienbarer Geräte mit einer Blende |
ES2225002T3 (es) | 2000-12-04 | 2005-03-16 | Whirlpool Corporation | Maquina lavadora con perceptor para deteccion continua del nivel del agua. |
DE10161918C2 (de) * | 2001-12-17 | 2003-10-23 | Bosch Gmbh Robert | Verfahren zum Betrieb eines Füllstandssensors und Füllstandssensor |
-
2003
- 2003-12-22 DE DE10360554A patent/DE10360554A1/de not_active Withdrawn
-
2004
- 2004-12-13 AT AT04804785T patent/ATE481917T1/de not_active IP Right Cessation
- 2004-12-13 EP EP04804785A patent/EP1701646B1/de active Active
- 2004-12-13 US US10/583,636 patent/US8161987B2/en not_active Expired - Fee Related
- 2004-12-13 WO PCT/EP2004/053422 patent/WO2005060816A1/de active Application Filing
- 2004-12-13 CN CNA2004800384665A patent/CN1897864A/zh active Pending
- 2004-12-13 DE DE502004011690T patent/DE502004011690D1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2005060816A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1897864A (zh) | 2007-01-17 |
ATE481917T1 (de) | 2010-10-15 |
US20070272286A1 (en) | 2007-11-29 |
EP1701646B1 (de) | 2010-09-22 |
WO2005060816A1 (de) | 2005-07-07 |
US8161987B2 (en) | 2012-04-24 |
DE10360554A1 (de) | 2005-07-14 |
DE502004011690D1 (de) | 2010-11-04 |
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