EP1238623B1 - Procédé de calibrage d'un capteur de turbidité - Google Patents

Procédé de calibrage d'un capteur de turbidité Download PDF

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Publication number
EP1238623B1
EP1238623B1 EP02003074A EP02003074A EP1238623B1 EP 1238623 B1 EP1238623 B1 EP 1238623B1 EP 02003074 A EP02003074 A EP 02003074A EP 02003074 A EP02003074 A EP 02003074A EP 1238623 B1 EP1238623 B1 EP 1238623B1
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EP
European Patent Office
Prior art keywords
calibration
value
turbidity
program
determined
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.)
Expired - Lifetime
Application number
EP02003074A
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German (de)
English (en)
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EP1238623A3 (fr
EP1238623A2 (fr
Inventor
Dominic Beier
Erik Berends
Günther Maas
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
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Miele und Cie KG
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Publication date
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Publication of EP1238623A2 publication Critical patent/EP1238623A2/fr
Publication of EP1238623A3 publication Critical patent/EP1238623A3/fr
Application granted granted Critical
Publication of EP1238623B1 publication Critical patent/EP1238623B1/fr
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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 adjusting and correcting a turbidity sensor in a program-controlled water-conducting household appliance, in particular in a dishwasher, changing conditions at the measuring location, whereby in the current washing program Calibration or reference values for sensor calibration and correction of the turbidity sensor be determined in turbidity measurements of the rinsing liquid.
  • the turbidity sensors favored in washing machines or dishwashers are constructed according to the light barrier principle and consist of a transparent plastic tube, through which the medium to be measured (rinse water) flows.
  • an optical measuring section consisting of an optical transmitter (LED, lamp or the like) and an optical receiver (phototransistor or the like) built up.
  • the attenuation of the light caused by the turbidity is evaluated within the measuring section to control the washing program depending on the measurement result, sh. for example, US Pat. No. 3,888,269.
  • From US 5 048 139 A is an alignment of the transmitted light power of a turbidity sensor known for compensation of component tolerances.
  • the invention thus raises the problem of a calibration method for one in a water-bearing Household appliance used turbidity sensor to create, with which to For the purpose of obtaining optimum rinsing or cleaning results, reliable correction values for the sensor at turbidity value measurements even under changing conditions on Achieve the measuring location.
  • the flushing water turbidity is lowest, from a multiple Spülprogrammtrain containing series of measured values is selected for reference value determination, wherein several best selected calibration measured values from several separate rinse program runs for final reference value formation again are averaged, it is ensured that always the most optimal reference value for haze value correction is used.
  • the multiple measurement preceding the valuation provides sure that at least one best calibration measured value from the measured value series is clear Fresh water is determined.
  • the invention is according to FIG. 1 of an electronically program-controlled dishwasher (1) as a water-conducting household appliance whose manual or automatic selectable wash programs (SP) program sections, such as pre-wash (V), cleaning (R), intermediate rinsing (ZW), rinsing (K) and drying (T) according to FIG. 2, wherein each according to established degree of contamination of the loaded dishes or in circulation located rinse the pre-rinse and / or intermediate rinses off or in addition can be controlled.
  • SP manual or automatic selectable wash programs
  • the (1) designated and shown schematically front-loading household dishwasher has according to FIG. 1 a rinsing container (2) and a plurality of spray arms (3, 4, 5) arranged above and between dish racks (6, 7) and a separate cutlery basket (8) in different flushing levels in the washing compartment (2) are arranged.
  • the spray arms (3, 4, 5) be about associated supply lines (11, 12) of the circulating rinsing liquid (13) of a fed upstream circulating pump (9), the rinsing liquid in the rinsing operation constantly via a filter screen combination (10) is guided, which consists of a in the Spül electer Guinea arranged fine sieve and a coarse sieve and a fine sieve exists.
  • the cutlery basket (8) is as a cutlery drawer formed and in a separate from the crockery baskets (6, 7) Spülebene about the two superimposed separate crockery baskets (6, 7) in the washing compartment (2) with a separate spray arm (5) arranged.
  • the the washing container (2) for dishwashing via a fresh water connection (14) and the Softener supplied Spülillonkeitsmenge is largely on the amount of too controlled by cleaning dishes.
  • Rinse water quantities or fluid change also from the self-adjusting dishwashing depending, in particular through appropriate Spülwassertrübungen during pre-rinsing (V) and cleaning (R).
  • the dishwasher (1) has an optical sensor in the form of a known per se Turbidity sensor (15), which with the program control (P) connected to predetermined Times in the aforementioned program sections each of the turbidity of Rinsing liquid detects and a determined pollution degree corresponding measurement signal supplies, which due to on the measuring location adjusting component and / or Translucence tolerances or specimen scattering of the sensors with a stored Calibration or reference value (RW) must be corrected.
  • the turbidity sensor (15) or its measuring location is for example in the collecting pot of the dishwasher placed below the filter screen combination (10).
  • the turbidity sensor (15) used works according to the light barrier principle and consists of a transparent plastic tube through which the medium to be measured (rinse water) flows. At right angles to the plastic tube is an optical measuring section consisting of an optical transmitter (light emitting diode, lamp or the like) and an optical receiver (Phototransistor or the like.) Built. It is evaluated by the turbidity caused Damping of the light within the measuring section.
  • the structure of the turbidity sensor (15) is on known and therefore not shown in detail. Turbidity sensors point to each other due to the component tolerances, the alignment of the optical components and the Tolerances in the translucency of the plastic very strong variations. Additional Scatters are caused by the component tolerances of the external wiring of the Sensor. In addition, deposits (such as lime) and / or damage to the Pipe surface within the measuring section and the aging of the optical components too lead to a falsification of the measurement results.
  • RW turbidity values
  • WM calibration value measurements - in the exemplary embodiment three Measurements - within a wash program (SP) at the times (t1 to t3) carried out at which it is very likely that clear water is available at the measuring location of the Turbidity sensor (15) is located.
  • the three Calibration value measurements (KWM1 to KWM3) result in corresponding calibration measured values (KW1 to KW3).
  • the Kalibriermess uncomfortable (KW) from several washing programs (SP) are in a first Memory table (ST1) stored in FIG. 3 and from the obtained measured values the best calibration reading (KWb) is selected and stored separately in a second memory table (ST2) stored. Subsequently, the first memory table (ST1) is deleted again and it As previously described, calibration readings (KW) are repeated in subsequent rinse programs (SP) detected and stored in the first memory, whereupon when filled first memory table (ST1) again the best value (KWb) selected and in the second memory table (ST2) Once the second memory table (ST2) with best calibration readings (KWb) is written by value determination of the selected best values for the turbidity value corrections required calibration or reference value (RW) determined. The im Rinse cycle of subsequent rinse programs queried at certain times Turbidity values (TW) are then compared with the determined calibration or reference value (RW). corrected.
  • TW Turbidity values
  • the calibration value measurement is described in more detail below, assuming that in a rinsing program (SP) at different times (t; t ') three calibration values (KW) and three turbidity values (TW).
  • the new reference value (RW1) is calculated from the three calibration value measurements (KWM1-1 to KWM3-1) in the first rinse program (SP1) obtained calibration measured values (KW1-1 to KW3-1) as well as from the subsequent second wash program (SP2) obtained calibration measured values (KW1-2 to KW3-2) in the first memory table (ST1) of rewritable nonvolatile memory (EEPROM) of program control (P) stored separately, with each determined calibration measured value (KW1-1 to KW3-2) at the measuring location adjusting component and / or light transmission tolerances are taken into account.
  • the first memory table (ST1) cleared and new calibration measurements from subsequent ones Calibration value measurements (KWM1-3 to KWM3-3 and KWM1-4 to KWM3-4) of two others Wash programs (SP3, SP4) are stored in this memory table (ST1).
  • the best Calibration reading (KWb3-4) is stored again, etc.
  • the mean value is calculated which the new reference value (RW1) forms and replaces the factory default reference value (RW0).
  • the memory table (ST2) is then deleted and prepared for a new value acquisition.
  • the turbidity readings (TW) subsequent rinse programs are with the new corrected reference value (RW1), etc.
  • the optical transmitter (LED or the like.) Of the turbidity sensor (15) on an adjustable Constant current source (IK), Fig. 4, operated. With the help of the constant current source (IK), the Light output of the optical transmitter within predetermined tolerance limits of one Control computer (SR) of the program control (P) by a control signal (manipulated variable y) to be influenced. After signal conditioning in (16), this is affected by the turbidity sensor (15) coming voltage signal (measurement signal x) the control computer (SR). With (z) that becomes Measuring medium, by damping the optical path of the turbidity sensor (15) acts on the control circuit shown in the block diagram of FIG.
  • IK adjustable Constant current source
  • the light output of the optical transmitter is always selected such that, with clear rinsing water at the measuring location, a defined operating point (Y 0 , X 0 ) of the optical receiver (phototransistor or the like) of the turbidity sensor (15 ).
  • the time at which clear water is available at the measuring location in the current program (SP) can not, as initially mentioned, be determined with complete certainty. But yes For example, the times (t1 to t3) can be determined, with high probability clear rinsing liquid (13) is located at the measuring location of the turbidity sensor (15). That's why several calibration value measurements (KWM), in the exemplary embodiment three measurements, carried out.
  • the best calibration measured value (KWb) is indicated by the smallest diode current value, which is used to set a defined phototransistor voltage (am Working resistance) is necessary.
  • the last of several best calibration readings (KWb) Reference value (RW) calculated by value determination represents the diode current to be set Turbidity sensor (15), which is then used for turbidity measurement. decreases In the course of the turbidity measurements, for example, the luminosity of the transmitting diode of Turbidity sensor (15) with the life, this is due to the continuous increase compensated for the diode current.
  • the light output of the optical transmitter of the turbidity sensor is thus varied within predefined tolerance limits which can be derived from component tolerances and / or light transmission tolerances in order to achieve the defined operating point.
  • the control signal X is readjusted until the defined operating point (Y 0 , X 0 ) adjusts to the transfer characteristic of the entire measuring path. From each "n” determined operating points of the cheapest is selected. In each case “m” favorable operating points (measured calibration values) are averaged and give the reference value for the correction of the turbidity measured values.
  • the calibration value measurement must before the first rinse (ie before program start) omitted.

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  • Washing And Drying Of Tableware (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Claims (7)

  1. Procédé pour régler et pour corriger un capteur de turbidité dans un appareil ménager à débit d'eau commandé par programme, notamment dans un lave-vaisselle, en fonction de conditions qui se modifient au lieu de mesure, sachant que, pendant le programme de lavage en cours, des valeurs d'étalonnage ou de référence pour le réglage du capteur et pour la correction du capteur de turbidité sont déterminées lors de mesures de turbidité du liquide de lavage à un instant où se trouve avec une forte probabilité de l'eau claire au lieu de mesure du capteur de turbidité (15),
    caractérisé
    en ce que plusieurs mesures de valeur d'étalonnage sont effectuées pendant un programme de lavage,
    en ce que des valeurs de mesure d'étalonnage (KW 1-1, KW 2-1, KW 3-1 ; KW 1-2, KW 2-2, KW 3-2) provenant de plusieurs programmes de lavage (SP1, SP2) sont mémorisées dans un premier tableau de mémoire (ST1),
    en ce que, à partir des valeurs de mesure d'étalonnage mémorisées (KW 1-1, KW 2-1, KW 3-1 ; KW 1-2, KW 2-2, KW 3-2), on détermine la valeur de mesure d'étalonnage pour laquelle la turbidité de l'eau de lavage est la plus faible, qu'on appelle la « meilleure valeur de mesure d'étalonnage », et on la mémorise dans un tableau de mémoire séparé (ST2),
    en ce que la détection de valeurs de mesure d'étalonnage, leur mémorisation, la détermination de la meilleure valeur de mesure d'étalonnage et la mémorisation de cette valeur sont répétées au cours des programmes de lavage suivants,
    en ce que, par formation d'une valeur moyenne des meilleures valeurs de mesure d'étalonnage sélectionnées, on détermine une valeur d'étalonnage ou de référence (RW1),
    et en ce que des valeurs mesurées de turbidité (TW) de programmes de lavage suivants (SP) sont, jusqu'à la prochaine nouvelle détermination de valeur de référence, corrigées avec la valeur d'étalonnage ou de référence déterminée (RW1).
  2. Procédé selon la revendication 1, caractérisé en ce que des valeurs de mesure d'étalonnage (KW) d'au moins deux programmes de lavage successifs (SP) sont respectivement enregistrées séparément dans un tableau de mémoire (ST1), sachant que chaque valeur de mesure d'étalonnage déterminée (KW) tient également compte de tolérances d'éléments structurels et/ou de transmission de la lumière qui s'établissent au lieu de mesure, en ce que, à l'atteinte d'un nombre prédéfini de valeurs de mesure d'étalonnage enregistrées (KW), la meilleure valeur de mesure d'étalonnage (KWb) est lue dans le tableau de mémoire (ST1) et apportée à un deuxième tableau de mémoire (ST2) présentant lui aussi plusieurs emplacements de mémoire, à la suite de quoi le premier tableau de mémoire (ST1) est effacé et de nouvelles valeurs de mesure d'étalonnage (KW) provenant de mesures suivantes de valeur d'étalonnage (KWM) sont mémorisées dans ce tableau,
    en ce que, à partir des meilleures valeurs de mesure d'étalonnage mémorisées (KWb) du deuxième tableau de mémoire (ST2), on calcule une valeur moyenne, et la valeur calculée est utilisée comme nouvelle valeur de référence (RW1) pour les mesures de turbidité de programmes de lavage suivants (SP).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, lors de la mesure répétée de valeurs d'étalonnage, on effectue une première mesure pendant le programme de lavage (SP) au début du programme (instant t1), de préférence à l'étape de vidange, une autre mesure pendant le cycle de rinçage (K) avant un dosage de produit de rinçage (instant t2), et une troisième mesure de valeur d'étalonnage à la fin (instant t3) de la séquence de programme de séchage (T).
  4. Procédé selon une ou plusieurs des revendications 1 à 3, caractérisé en ce que, lors de la première mise en service de l'appareil au lieu d'installation, on se sert d'une valeur de référence (RW0) prédéfinie en usine comme valeur de correction de base pour les mesures de valeur de turbidité.
  5. Procédé selon une ou plusieurs des revendications 1 à 4, caractérisé en ce que, afin de compenser les tolérances d'éléments structurels et/ou de transmission de la lumière, on fait varier l'efficacité lumineuse de l'émetteur optique du capteur de turbidité (15) à l'intérieur de limites prédéfinies de tolérance qui peuvent être déduites des tolérances d'éléments structurels et/ou de transmission de la lumière.
  6. Procédé selon une ou plusieurs des revendications 1 à 5, caractérisé en ce que l'émetteur optique du capteur de turbidité (15) fonctionne avec une source réglable de courant constant (IK), sachant que la compensation de tolérances d'éléments structurels et de tolérances de transmission de la lumière du parcours de mesure s'effectue par réajustement de l'efficacité lumineuse de l'émetteur optique en un point de travail prédéterminé du récepteur optique.
  7. Procédé selon une ou plusieurs des revendications 1 à 6, caractérisé en ce que plusieurs mesures de turbidité sont effectuées pendant un programme de lavage (SP).
EP02003074A 2001-03-07 2002-02-13 Procédé de calibrage d'un capteur de turbidité Expired - Lifetime EP1238623B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10111006A DE10111006A1 (de) 2001-03-07 2001-03-07 Verfahren zum Abgleichen eines Trübungssensors
DE10111006 2001-03-07

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EP1238623A2 EP1238623A2 (fr) 2002-09-11
EP1238623A3 EP1238623A3 (fr) 2003-08-13
EP1238623B1 true EP1238623B1 (fr) 2005-07-20

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AT (1) ATE299663T1 (fr)
DE (2) DE10111006A1 (fr)
ES (1) ES2241907T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
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CN102995133A (zh) * 2012-12-28 2013-03-27 徐州腾宇羽绒制品设备有限公司 羽绒洗脱机
CN103315688A (zh) * 2012-12-28 2013-09-25 苏州韩博厨房电器科技有限公司 一种自动洗碗机清洗工艺
US11849901B2 (en) 2021-09-01 2023-12-26 Haier Us Appliance Solutions, Inc. Dishwashing appliance and methods for improved calibration using image recognition

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DE10253009B3 (de) * 2002-11-14 2004-04-08 Whirlpool Corp., Benton Harbor Verfahren zum Betrieb einer Geschirrspülmaschine
CN100531661C (zh) * 2004-04-12 2009-08-26 乐金电子(天津)电器有限公司 洗碗机的进程控制方法
DE102004035848A1 (de) 2004-07-23 2006-03-23 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Kalibrieren von Sensoren
DE102005062388A1 (de) * 2005-12-23 2007-06-28 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Kalibrierung im Laborreferenzverfahren
DE102007031480B4 (de) 2007-07-06 2009-05-14 BSH Bosch und Siemens Hausgeräte GmbH Sensoreinrichtung und Verfahren zur Erfassung der Trübung von Spülflotte
IT1392420B1 (it) † 2008-12-22 2012-03-02 Indesit Co Spa Lavastoviglie.
DE102014118205B4 (de) * 2014-12-09 2022-09-29 Endress+Hauser Conducta Gmbh+Co. Kg Verfahren zur Bestimmung einer Trübung und Trübungssensor zur Ausführung des Verfahrens
DE102019120897A1 (de) * 2019-08-02 2021-02-04 Endress+Hauser Group Services Ag Mobile Anlage für das Kalibrieren, Verifizieren und/oder Justieren eines Sensors und Verfahren zum Kalibrieren, Verifizieren und/oder Justieren eines Sensors
CN111089862B (zh) * 2019-12-31 2024-06-04 中国科学院合肥物质科学研究院 一种可用于极端环境的标准浊度标定装置及其标定方法
DE102020212542A1 (de) 2020-10-05 2022-04-07 BSH Hausgeräte GmbH Wäschepflegegerät mit einer Steuerung

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CA1266385A (fr) * 1985-01-08 1990-03-06 Koji Kikuchi Machine de lessivage a turbidimetre, et son fonctionnement
JPH0793918B2 (ja) * 1992-02-04 1995-10-11 三洋電機株式会社 食器洗い乾燥機の制御装置
DE19528978C2 (de) * 1995-08-07 2001-05-17 Bsh Bosch Siemens Hausgeraete Verfahren zum Abgleichen einer optoelektronischen Einrichtung zum Feststellen eines Spül-Erfolgs in einer Wasch- oder Geschirrspülmaschine
DE19705926A1 (de) * 1997-02-17 1998-08-20 Aeg Hausgeraete Gmbh Haushaltsgerät mit einer Meßeinrichtung zum Ermitteln des Verschmutzungsgrades einer Reinigungsflüssigkeit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102995133A (zh) * 2012-12-28 2013-03-27 徐州腾宇羽绒制品设备有限公司 羽绒洗脱机
CN103315688A (zh) * 2012-12-28 2013-09-25 苏州韩博厨房电器科技有限公司 一种自动洗碗机清洗工艺
CN103315688B (zh) * 2012-12-28 2015-06-17 苏州韩博厨房电器科技有限公司 一种自动洗碗机清洗工艺
US11849901B2 (en) 2021-09-01 2023-12-26 Haier Us Appliance Solutions, Inc. Dishwashing appliance and methods for improved calibration using image recognition

Also Published As

Publication number Publication date
EP1238623A3 (fr) 2003-08-13
DE10111006A1 (de) 2002-11-07
DE50203654D1 (de) 2005-08-25
EP1238623A2 (fr) 2002-09-11
ES2241907T3 (es) 2005-11-01
ATE299663T1 (de) 2005-08-15

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