EP1180344A2 - Procédé pour la détermination du degré de salissure du liquide de lavage pour un lave-vaisselle programable et avec capteur de turbidité - Google Patents

Procédé pour la détermination du degré de salissure du liquide de lavage pour un lave-vaisselle programable et avec capteur de turbidité Download PDF

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Publication number
EP1180344A2
EP1180344A2 EP01119106A EP01119106A EP1180344A2 EP 1180344 A2 EP1180344 A2 EP 1180344A2 EP 01119106 A EP01119106 A EP 01119106A EP 01119106 A EP01119106 A EP 01119106A EP 1180344 A2 EP1180344 A2 EP 1180344A2
Authority
EP
European Patent Office
Prior art keywords
signal
measurement
washing liquid
turbidity sensor
rinsing
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Withdrawn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
EP01119106A
Other languages
German (de)
English (en)
Other versions
EP1180344A3 (fr
Inventor
Andre Bertram
Erik Ekelhoff
Günther Dr. Ennen
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.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
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 Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP1180344A2 publication Critical patent/EP1180344A2/fr
Publication of EP1180344A3 publication Critical patent/EP1180344A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • A47L15/4297—Arrangements for detecting or measuring the condition of the washing water, e.g. turbidity

Definitions

  • the invention relates to a method for determining the degree of contamination of the rinsing liquid in a program-controlled dishwasher equipped with a turbidity sensor, taking from the change in the measurement signals of the sensor corresponding to the contamination the flushing liquid is more or less noisy, a statement about the respective Degree of contamination of the washing liquid to control the washing process becomes.
  • the turbidity sensors used in the process consists of a light-emitting element, e.g. B. a light emitting diode (LED), and from a light-receiving element, e.g. B. a phototransistor, which is to be sensed for contamination Flushing or cleaning liquid either directly through the beam path (Measuring section) of the optics is guided (see DE 41 22 988 A1), or scanned by reflection (see US 3 888 269).
  • a light-emitting element e.g. B. a light emitting diode (LED)
  • a light-receiving element e.g. B. a phototransistor
  • the light penetrates the rinsing liquid, whereby Analog measurement signals from Noise corresponding to the contamination of the rinsing liquid more or less high voltage levels are generated at the output of the light receiver.
  • the noisy measurement signals indicate the degree of contamination of the Flushing liquid and are after appropriate digital signal processing and amplification used to control the rinsing process.
  • a measurement of the Turbidity of the washing liquid when pre-washing or rinsing the dishes is a decision via a water change or an additional rinse cycle before or after the program section Clean.
  • the decision to run the program can be done with little dirt Rinsing liquid so that pre-rinsing immediately, i.e.
  • the invention advantageously makes it possible to pass through the measuring section of the optical sensor "floating" particles, each of which absorbs the light from the optics for short moments, as Filter out signal jumps and convert them into usable signals.
  • the digitized signal jumps are then by means of the computer of the electronic device program control evaluable and control the program run of the dishwasher accordingly the type and amount of pollution determined.
  • the invention is based on an electronically program-controlled dishwasher (1), whose manually or automatically selectable wash programs each have separate program sections, such as pre-rinsing, cleaning, rinsing and rinsing, depending on determined degree of soiling of the dishes or washing-up liquid loaded into the machine the pre-rinse and / or intermediate rinse cycles are activated or additionally activated can. After the last rinse program section, a program section usually closes Drying.
  • Such dishwashers belong to the general state the technology and have essentially components and accessories, as shown in Fig. 1 the household appliance shown is shown in simplified form. On the concrete presentation of the only The program control (13) of the device shown as an example in block diagram form is the better one For the sake of clarity.
  • the (1) designated and schematically shown front-loading household dishwasher has a rinsing tank (2) and several spray arms (3, 4, 5), which over and between crockery baskets (6, 7) and a separate cutlery basket (8) in different Wash levels are arranged in the wash tank (2).
  • the spray arms (3, 4, 5) are assigned via Supply lines (11, 12) from the circulating rinsing liquid of an upstream circulation pump (9) fed, the rinsing liquid in the rinsing mode constantly via a filter screen combination (10) is guided out of a fine sieve arranged in the bottom of the washing compartment as well as a coarse sieve and a fine sieve. There are leftovers from the Filtered out rinsing liquid (17).
  • the cutlery basket (8) is designed as a cutlery drawer and in a washing level separated from the crockery baskets (6, 7) above the two one above the other lying separate crockery baskets (6, 7) in the washing compartment (2) with their own spray arm (5) arranged.
  • the dishes to be cleaned are placed in the baskets (6, 7) and the individual cutlery parts of the place settings in the cutlery basket (8) sorted stored. Depending on the amount of crockery, the crockery baskets (6, 7) can be completely or only be partially loaded.
  • a fresh water supply is started at the start of the wash (14) of the device in a known manner lying solenoid valve for the rinse water inlet to the rinsing tank (2) opened. Above a certain water level in the rinse tank (2) the fresh water supply is interrupted and the spray arms (3, 4, 5) are switched on Circulation pump (9) supplied with the supplied rinsing liquid and rotate.
  • the one Rinse tank (2) amount of rinsing liquid supplied for dishwashing is largely from controlled depending on the amount of dishes to be cleaned. In addition, are in the flushing mode Amounts of rinse water to be supplied or liquid changes also from the ones that occur Dish soiling dependent. In particular, rinsing water contamination, for example dirt particles that are difficult or impossible to dissolve, such as spinach residues or the like, which "float" in the rinsing liquid, have a negative effect on the rinsing result impact. This is where the invention comes in.
  • Such measurement signals (16) are shown in the signal diagrams according to FIGS. 2 and 3.
  • the turbidity measuring sensor used consists of a light-emitting element (15a), for. B. a light emitting diode (LED) and a light-receiving element (15b), e.g. B. a photo transistor, the rinsing or cleaning liquid (17) to be sensed for contamination directly through the beam path of the optics in a preferably calmed measuring section (18) is directed.
  • the measurement is therefore carried out with moderately agitated rinsing liquid.
  • the turbidity sensor (15) is advantageous in the watercourse to the upper spray arm (5), for example in a bypass (19) or parallel by-pass Spray arm feed line (12) arranged.
  • the calmed measuring section (18) can also be the supply line can be connected in parallel to another spray arm of the dishwasher (1). This ensures that any air bubbles are separated and not as dirt particles can be detected.
  • the turbidity sensor (15) used works with the transmitted light method. With this principle the light penetrates the rinsing liquid (17), the corresponding to the contamination of the Flushing liquid the more or less large analog measurement signal (16) at the output of the light receiver (15b) is generated. From the change in the measurement signals (16) of the turbidity sensor (15), which noises more or less according to the contamination of the washing liquid are a statement on the respective degree of contamination of the washing liquid Control of the rinsing process taken.
  • the generated measurement signal (16) corresponding signal jumps (20) according to FIGS. 2 and 3 are generated.
  • the method according to the invention provides for these signal jumps (20) to be filtered out and converted into usable signals. This is a detection of the dirt particle concentration and also a determination the particle sizes (width of the signal jumps 20) and the number of those in the rinsing liquid (17) existing dirt particles possible.
  • the noisy measurement signal (16), Fig. 2 is filtered and amplified.
  • the measurement signal (16) supplied by the turbidity sensor (15) passed through a high-pass filter, not shown, an amplifier and an inverting stage.
  • the signal evaluation can For example, be such that the signal pattern of the digitized measurement signals generated according to FIG. 3 (16 ') with in the computer of the device electronics in a programmable memory, for example stored signal images are compared, which specific types of contamination, Soiling, particles and the like are assigned. From the frequency and the The computer then concludes the respective duration of the signal dip (20) in the measurement signal Number and size of the particles in the rinsing liquid and their dirt concentration. Depending on the comparison result, the program run of the device is then interfered with.
  • the curve in FIGS. 2 and 3 clearly represents that provided by the turbidity sensor (15) Measurement signal and the signal forms derived from it via signal duration (T) and signal height (Voltage U).
  • Fig. 2 shows a possible waveform of the measurement signal (16), as in one with spinach dirty washing liquid (17) is typical. Similar signal curves result for particles of bread crumbs, etc. The particles floating past the optics in the rinsing liquid absorb the light of the light-emitting diode when crossing the measuring path (18). The light absorption causes a brief dip in the transistor output voltage, causing the aforementioned signal dips or jumps (20) of the signal are identified.
  • the Measurement signal (16) is inverted, then electronically processed. After digitization in a comparator it can be evaluated by the computer.
  • the inverted measurement signal (16 ') is illustrated by signal curve I and the digitized signal by curve II in FIG. 3. With the latter signal, the digitized signal jumps to be evaluated in the computer are designated 20 '.

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  • Washing And Drying Of Tableware (AREA)
EP01119106A 2000-08-18 2001-08-08 Procédé pour la détermination du degré de salissure du liquide de lavage pour un lave-vaisselle programable et avec capteur de turbidité Withdrawn EP1180344A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000140483 DE10040483A1 (de) 2000-08-18 2000-08-18 Verfahren zur Ermittlung des Verschmutzungsgrades der Spülflüssigkeit bei einer mit einem Trübungssensor ausgestatteten programmgesteuerten Geschirrspülmaschine
DE10040483 2000-08-18

Publications (2)

Publication Number Publication Date
EP1180344A2 true EP1180344A2 (fr) 2002-02-20
EP1180344A3 EP1180344A3 (fr) 2004-05-19

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Application Number Title Priority Date Filing Date
EP01119106A Withdrawn EP1180344A3 (fr) 2000-08-18 2001-08-08 Procédé pour la détermination du degré de salissure du liquide de lavage pour un lave-vaisselle programable et avec capteur de turbidité

Country Status (2)

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EP (1) EP1180344A3 (fr)
DE (1) DE10040483A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004101878A1 (fr) * 2003-05-16 2004-11-25 Emz-Hanauer Gmbh & Co. Kgaa Dispositif pour unite de detection pour detecter des proprietes optiques d'un milieu
WO2006031057A1 (fr) * 2004-09-14 2006-03-23 Lg Electronics Inc. Lave-vaisselle et son procede de commande
EP1419727A3 (fr) * 2002-11-14 2006-09-06 Whirlpool Corporation Dispositif de mesure de la turbidité du liquide de rinçage dans un lave-vaisselle
US7246625B2 (en) * 2000-11-28 2007-07-24 Miele & Cie. Gmbh & Co. Dishwasher
US7540293B2 (en) 2004-09-14 2009-06-02 Lg Electronics Inc. Dishwasher
EP2206457A1 (fr) * 2009-01-07 2010-07-14 Electrolux Home Products Corporation N.V. Détection de détergent
EP2221604A1 (fr) * 2009-02-19 2010-08-25 Electrolux Home Products Corporation N.V. Capteur de turbidité
WO2011110243A1 (fr) * 2010-03-10 2011-09-15 Henkel Ag & Co. Kgaa Appareil de dosage avec capteur optique
CN109512359A (zh) * 2018-12-31 2019-03-26 华帝股份有限公司 一种洗碗机及其洗涤剂投放控制装置和方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10248538A1 (de) * 2002-10-17 2004-04-29 Aweco Appliance Systems Gmbh & Co. Kg Verfahren zur Wasserverschmutzungserkennung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5011286A (en) * 1989-08-03 1991-04-30 Met One, Inc. Multisensor particle counter utilizing a single energy source
US5140168A (en) * 1990-12-03 1992-08-18 Great Lakes Instruments, Inc. Turbidimeter signal processing circuit using alternating light sources
US5164604A (en) * 1991-05-01 1992-11-17 Allied-Signal Inc. Multiport particle detection apparatus utilizing a plenum having a plurality of spatically separate channels in fluid combination
US5446531A (en) * 1994-05-20 1995-08-29 Honeywell Inc. Sensor platform for use in machines for washing articles
US5800628A (en) * 1996-10-22 1998-09-01 Honeywell Inc. Continuous cycle operation for dishwashers using turbidity sensor feedback

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7246625B2 (en) * 2000-11-28 2007-07-24 Miele & Cie. Gmbh & Co. Dishwasher
EP1419727A3 (fr) * 2002-11-14 2006-09-06 Whirlpool Corporation Dispositif de mesure de la turbidité du liquide de rinçage dans un lave-vaisselle
WO2004101878A1 (fr) * 2003-05-16 2004-11-25 Emz-Hanauer Gmbh & Co. Kgaa Dispositif pour unite de detection pour detecter des proprietes optiques d'un milieu
WO2006031057A1 (fr) * 2004-09-14 2006-03-23 Lg Electronics Inc. Lave-vaisselle et son procede de commande
US7540293B2 (en) 2004-09-14 2009-06-02 Lg Electronics Inc. Dishwasher
US7836535B2 (en) 2004-09-14 2010-11-23 Lg Electronics Inc. Dishwasher and a method for controlling the same
DE112005001967B4 (de) * 2004-09-14 2016-09-01 Lg Electronics Inc. Geschirrspülmaschine und Verfahren zum Steuern derselben
EP2206457A1 (fr) * 2009-01-07 2010-07-14 Electrolux Home Products Corporation N.V. Détection de détergent
EP2221604A1 (fr) * 2009-02-19 2010-08-25 Electrolux Home Products Corporation N.V. Capteur de turbidité
WO2011110243A1 (fr) * 2010-03-10 2011-09-15 Henkel Ag & Co. Kgaa Appareil de dosage avec capteur optique
CN109512359A (zh) * 2018-12-31 2019-03-26 华帝股份有限公司 一种洗碗机及其洗涤剂投放控制装置和方法

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Publication number Publication date
DE10040483A1 (de) 2002-03-07
EP1180344A3 (fr) 2004-05-19

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