EP1238623A2 - Calibrating method of a turbidity sensor - Google Patents
Calibrating method of a turbidity sensor Download PDFInfo
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- EP1238623A2 EP1238623A2 EP02003074A EP02003074A EP1238623A2 EP 1238623 A2 EP1238623 A2 EP 1238623A2 EP 02003074 A EP02003074 A EP 02003074A EP 02003074 A EP02003074 A EP 02003074A EP 1238623 A2 EP1238623 A2 EP 1238623A2
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- Prior art keywords
- value
- calibration
- turbidity
- program
- measurements
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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, to changing conditions at the measuring location, while the washing program is running Calibration or reference values for sensor adjustment and for correction of the turbidity sensor be determined during turbidity measurements of the rinsing liquid.
- the preferred turbidity sensors used 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 (rinsing water) flows.
- a transparent plastic tube through which the medium to be measured (rinsing water) flows.
- an optical measuring section consisting of an optical transmitter (Light-emitting diode, lamp or the like.) And an optical receiver (photo transistor 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 3,888,269.
- the invention thus poses the problem of a calibration method for a in a water-bearing Household appliance used to create turbidity sensor, with which to Reliable correction values for the purpose of achieving optimal rinsing or cleaning results for the sensor in turbidity measurements even under changing conditions on Have the measurement location achieved.
- the best calibration measurement value in each case the rinse water turbidity is the lowest, from a series of measurements containing several wash program runs is selected for determining the reference value, with several best selected calibration measurement values from several separate rinsing program runs for the final formation of the reference value averaged, it is ensured that the optimal reference value for turbidity correction is always used is used.
- the multiple measurement preceding the value determination provides sure that at least one of the best calibration measurement values from the measurement value series is clear Fresh water is determined.
- the invention is based on an electronically program-controlled dishwasher (1) as a water-bearing household appliance, its manual or automatic selectable wash programs (SP) each program section, such as pre-wash (V), cleaning (R), intermediate rinsing (ZW), rinsing (K) and drying (T) according to FIG. 2, with each after the degree of soiling of the loaded dishes or in circulation the pre-rinse and / or intermediate rinse cycles located in or additionally can be controlled.
- the last program section rinse aid (K) closes Regularly the drying section (T) starts, while continuing at the start of the washing program (SP) generally before pre-rinsing (V) the device's own softener after regeneration is rinsed with clear fresh water (pumping step A).
- washing in the Saline in the softener for regeneration is generally done after rinsing (K), the regeneration continues in the Drying (T) program section.
- Such dishwashers essentially have components and accessories, as shown in FIG. 1 the device shown is shown in simplified form, the sake of clarity concrete training of the program control (P) of the dishwasher (1), however, not is shown in more detail.
- the (1) designated and schematically shown front-loading household dishwasher 1 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 washing levels are arranged in the washing container (2).
- the spray arms (3, 4, 5) are one of the circulating rinsing liquid (13) via assigned feed lines (11, 12) upstream circulation pump (9) fed, the rinsing liquid in the rinsing mode constantly is guided over a filter screen combination (10), which consists of a in the bottom of the washing compartment arranged fine sieve and consists of a coarse sieve and a fine sieve. There will be Filtered leftovers from the rinsing liquid (13).
- the cutlery basket (8) is a cutlery drawer trained and in a separate from the crockery baskets (6, 7) washing level the two separate crockery baskets (6, 7) lying one above the other in the washing compartment (2) arranged its own spray arm (5).
- the amount of rinsing liquid supplied is largely dependent on the amount of depending on cleaning dishes.
- the dishwasher (1) has an optical sensor in the form of a known sensor Turbidity sensor (15), which is connected to the program control (P) to predetermined At times in the aforementioned program sections the cloudiness of the Detects rinsing liquid and a measurement signal corresponding to the determined degree of contamination delivers which due to component and / or Light transmission tolerances or specimen scatter of the sensors with a stored one 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 on the light barrier principle and consists of a transparent plastic tube through which the medium to be measured (rinsing water) flows. At right angles to the plastic tube there is an optical measuring section an optical transmitter (light-emitting diode, lamp or the like) and an optical receiver (Photo transistor or the like.) Built. The one caused by the turbidity is evaluated Attenuation of the light within the measuring section.
- the construction 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 on very strong scatter. Additional Scattering results from the component tolerances of the external wiring of the Sensor. In addition, deposits (e.g. lime) and / or damage to the Pipe surface within the measuring section as well as the aging of the optical components falsify the measurement results.
- a first calibration value measurement (KWM1) is carried out at the start of the program, preferably in Pumping-out step (A) when rinsing out the softener, the second measurement in the final rinse cycle (K) the rinse aid dosage at time (t2) and the third calibration value measurement (KWM3) at the end of the program section drying (T) at time (t3).
- the three Calibration value measurements (KWM1 to KWM3) result in corresponding calibration measurement values (KW1 to KW3).
- the calibration measured values (KW) from several wash programs (SP) are stored in a first one Storage table (ST1) according to FIG. 3 is saved and the measurement values obtained are used the best calibration measured value (KWb) selected and separately in a second memory table (ST2) saved. Then the first memory table (ST1) is deleted again and it calibration values (KW) in subsequent washing programs as described above (SP) recorded and stored in the first memory, whereupon the first memory table is filled up (ST1) again selected the best value (KWb) and into the second memory table (ST2) is written, etc. As soon as the second memory table (ST2) with the best calibration measurements (KWb) is written in full, by averaging the selected best values for the turbidity value corrections required calibration or reference value (RW) determined. The in Rinsing process of subsequent rinsing 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 washing program (SP) at different times (t; t ') three calibration values (KW) as well as three turbidity values (TW) are queried.
- the three calibration value measurements are used (KWM1-1 to KWM3-1) calibration measurement values obtained in the first washing program (SP1) (KW1-1 to KW3-1) as well as those from the following second washing program (SP2) determined calibration measurement values (KW1-2 to KW3-2) in the first memory table (ST1) of the rewritable, non-volatile memory (EEPROM) of the program control (P) stored separately, with each determined calibration measurement value (KW1-1 to KW3-2) at the measurement location adjusting component and / or light transmission tolerances are taken into account.
- the mean value is calculated, which is the new reference value (RW1) forms and replaces the factory-set reference value (RW0).
- the memory table (ST2) is then deleted and prepared for a new valuation.
- the turbidity measurements (TW) subsequent washing programs are new with the correct the determined reference value (RW1), etc.
- the optical transmitter LED or the like.
- the optical transmitter Of the turbidity sensor (15) on an adjustable Constant current source (IK), Fig. 4, operated.
- IK constant current source
- the Light output of the optical transmitter within predetermined tolerance limits of one Control computer (SR) of the program control (P) by means of a control signal (manipulated variable y) to be influenced.
- SR Control computer
- y control signal
- the turbidity sensor coming voltage signal (measurement signal x) the control computer (SR).
- (z) it will Designated measuring medium by damping the optical path of the turbidity sensor (15) acts on the control circuit shown in the block diagram according to FIG. 4.
- the light output of the optical transmitter is selected so that a clear operating point (Y 0 ; X 0 ) of the optical receiver (photo transistor or the like) of the turbidity sensor (15 ) sets.
- an additional power reserve to increase of the transmitted light output, so that the selected working point of the optical receiver can be used.
- the point in time when there is clear water in the running wash program (SP) at the measuring location cannot be determined with absolute certainty, as mentioned at the beginning. But yes the times (t1 to t3) can be determined with a high probability clear rinsing liquid (13) is located at the measuring point of the turbidity sensor (15). Therefore be several calibration value measurements (KWM), three measurements in the exemplary embodiment, carried out.
- the best calibration measurement value (KWb) is identified by the smallest diode current value that is used to set a defined phototransistor voltage (am Working resistance) is necessary.
- the reference value (RW) calculated by value averaging represents the diode current to be set Turbidity sensor (15), which is then used for turbidity measurement. decreases the luminosity of the transmitter diode of the Turbidity sensor (15) with the service life, this is due to the continuous increase of the diode current compensated.
- the light output of the optical transmitter of the turbidity sensor is thus varied within predetermined tolerance limits that can be derived from component 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 ) is set on the transmission characteristic of the entire measuring section. The cheapest is selected from “n” working points. In each case "m" favorable working points (measured calibration values) are averaged and result in the reference value for correcting the turbidity measurement values.
- the calibration value measurement must be carried out before the first rinse cycle (i.e. before the start of the program).
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- Washing And Drying Of Tableware (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Abgleichen und Korrektur eines Trübungssensors in einem programmgesteuerten wasserführenden Haushaltgerät, insbesondere in einer Geschirrspülmaschine, an sich ändernde Bedingungen am Messort, wobei im laufenden Spülprogramm Kalibrier- oder Referenzwerte für den Sensorabgleich und zur Korrektur des Trübungssensors bei Trübungsmessungen der Spülflüssigkeit ermittelt werden.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, to changing conditions at the measuring location, while the washing program is running Calibration or reference values for sensor adjustment and for correction of the turbidity sensor be determined during turbidity measurements of the rinsing liquid.
Die in Wasch- oder Geschirrspülmaschinen favorisiert eingesetzten Trübungssensoren sind nach dem Lichtschrankenprinzip aufgebaut und bestehen aus einem durchsichtigen Kunststoffrohr, durch welches das zu messende Medium (Spülwasser) fließt. Im rechten Winkel zum Kunststoffrohr ist eine optische Messstrecke bestehend aus einem optischen Sender (Leuchtdiode, Lampe oder dergl.) und einem optischen Empfänger (Fototransistor oder dergl.) aufgebaut. Ausgewertet wird die durch die Trübung verursachte Dämpfung des Lichtes innerhalb der Messstrecke, um von dem Messergebnis abhängig das Spülprogramm zu steuern, sh. beispielweise US 3 888 269.The preferred turbidity sensors used 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 (rinsing water) flows. At right angles to Plastic pipe is an optical measuring section consisting of an optical transmitter (Light-emitting diode, lamp or the like.) And an optical receiver (photo transistor 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 3,888,269.
Bei der Verwendung von Trübungssensoren besteht ein Problem darin, dass insbesondere Exemplarsteuerungen, Ablagerungen, Alterung der Bauelemente und/oder Beschädigungen an der Sensoroptik zu Verfälschungen des Messergebnisses führen, die sich negativ auf das Spülund Reinigungsergebnis auswirken. Zur Minderung dieses Problems schlägt beispielsweise die DE 41 22 988 A1 vor, zu Beginn des Spülbetriebs nach dem ersten Frischwassereinlauf eine Trübungsmessung durchzuführen, um so einen Ausgangswert als Berechnungsgrundlage für alle späteren Trübungsmessungen während des laufenden Spülprogramms zu erhalten. Eine solche Verfahrensweise ist jedoch nur dann sinnvoll, wenn nach der ersten Wasserfüllung auch tatsächlich klares Wasser im Spülbehälter am Messort (Trübungssensor) vorhanden ist. Da Geschirrspülmaschinen jedoch vor dem Spülprogrammlauf beladen werden, ist nicht auszuschließen, dass Speisereste beim Beladen der Körbe abtropfen und sich mit dem ersten Frischwasser vermischen. Durch die entstehende Spülwassertrübung wird das Messergebnis zum Kalibrieren des Sensors verfälscht.One problem with using turbidity sensors is that in particular Copy controls, deposits, aging of the components and / or damage the sensor optics lead to falsifications of the measurement result, which have a negative effect on the rinsing and Impact cleaning result. To alleviate this problem, for example, the DE 41 22 988 A1 before, at the beginning of the flushing operation after the first fresh water inlet Turbidity measurement so as to use an initial value as the basis for the calculation of to receive all subsequent turbidity measurements during the current washing program. A such a procedure is only useful if after the first water filling there is actually clear water in the rinsing tank at the measuring location (turbidity sensor). There However, dishwashers can be loaded before the wash program run cannot be ruled out. that leftovers drip when loading the baskets and with the first Mix fresh water. The result of the rinse water turbidity results in the measurement result falsified to calibrate the sensor.
Ferner ist es aus der DE 197 05 926 A1 bei einem Haushaltgerät mit einem Trübungssensor zur Ermittlung des Verschmutzungsgrades einer Reinigungsflüssigkeit bekannt, den in einem vorhergehenden Reinigungsprogramm im Klarspülgang ermittelten Kalibriermesswert für den Abgleich des Trübungssensors im folgenden neuen Reinigungsprogramm einzusetzen. Ein solches Kalibrierverfahren mit einem für jedes Spülprogramm neu zu bestimmenden Kalibrierwert kann jedoch nur dann optimal sein, wenn das dem Klarspülen vorausgehende Zwischenspülen des laufenden Spülprogramms nicht ausgeblendet ist. Bei einem ausgeblendeten Programmabschnitt Zwischenspülen besteht die Gefahr einer Laugenverschleppung aus Resten der schmutzbeladenen Reinigungsflüssigkeit in das Klarspülwasser, so dass der ermittelte Kalibrierwert auch hier aus einer - wenn auch ggf. nur geringen - Laugentrübung resultiert.Furthermore, it is from DE 197 05 926 A1 in a household appliance with a turbidity sensor to determine the degree of contamination of a cleaning liquid known in a previous cleaning program determined in the rinse aid calibration value for the Use the turbidity sensor in the following new cleaning program. On Such a calibration procedure with a new one to be determined for each washing program However, the calibration value can only be optimal if this precedes rinsing Intermediate rinsing of the current washing program is not hidden. With a hidden one There is a risk of caustic carryover in the intermediate rinsing program section from residues of the dirt-laden cleaning liquid in the rinse water, so that the Calibration value determined here too, from a lye clouding, even if only slightly results.
Der Erfindung stellt sich somit das Problem, ein Kalibrierverfahren für einen in einem wasserführenden Haushaltgerät eingesetzten Trübungssensor zu schaffen, mit welchem sich zum Zwecke der Erzielung optimaler Spül- oder Reinigungsergebnisse zuverlässige Korrekturwerte für den Sensor bei Trübungswertmessungen auch bei sich ändernden Bedingungen am Messort erzielen lassen.The invention thus poses the problem of a calibration method for a in a water-bearing Household appliance used to create turbidity sensor, with which to Reliable correction values for the purpose of achieving optimal rinsing or cleaning results for the sensor in turbidity measurements even under changing conditions on Have the measurement location achieved.
Erfindungsgemäß wird dieses Problem durch die Verfahrensschritte gemäß den Merkmalen
des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen des
Verfahrens ergeben sich aus den nachfolgenden Unteransprüchen.According to the invention, this problem is solved by the method steps according to the features
of
Da mit der Erfindung jeweils der beste Kalibriermesswert, bei dem jeweils die Spülwassertrübung am geringsten ist, aus einer mehrere Spülprogrammläufe beinhaltenden Messwertreihe zur Referenzwertermittlung selektiert wird, wobei mehrere beste selektierte Kalibriermesswerte aus mehreren separaten Spülprogrammläufen zur endgültigen Referenzwertbildung nochmals gemittelt werden, ist sichergestellt, dass immer der optimalste Referenzwert zur Trübungswert-Korrektur herangezogen wird. Die zur Wertermittlung vorausgehende Mehrfachmessung stellt sicher, dass wenigstens ein bester Kalibriermesswert aus der Messwertreihe bei klarem Frischwasser ermittelt wird.Since with the invention the best calibration measurement value, in each case the rinse water turbidity is the lowest, from a series of measurements containing several wash program runs is selected for determining the reference value, with several best selected calibration measurement values from several separate rinsing program runs for the final formation of the reference value averaged, it is ensured that the optimal reference value for turbidity correction is always used is used. The multiple measurement preceding the value determination provides sure that at least one of the best calibration measurement values from the measurement value series is clear Fresh water is determined.
Das erfindungsgemäße Verfahren ist nachfolgend in einem Ausführungsbeispiel näher beschrieben und zeichnerisch dargestellt. Es zeigt:
Figur 1- eine programmgesteuerte Geschirrspülmaschine im Querschnitt mit der vereinfachten Darstellung ihrer Bauelemente und ihrem Zubehör, wobei für die Feststellung des Verschmutzungsgrades der Spülflüssigkeit ein Trübungssensor im Wasserlauf des Gerätes vorgesehen ist,
Figur 2- einen in Vorspülen, Reinigen, Zwischenspülen, Klarspülen und Trocknen gegliederten Spülprogrammlauf der Geschirrspülmaschine,
Figur 3- ein Blockdiagramm zur Referenzwertberechnung für den T-übungssensor,
- Figur 4
- das Blockschaltbild eines Regelkreises zur Arbeitspunkteinstellung des Trübungssensors.
- Figure 1
- a program-controlled dishwasher in cross section with the simplified representation of its components and accessories, a turbidity sensor being provided in the water flow of the device for determining the degree of contamination of the washing liquid,
- Figure 2
- a rinsing program run of the dishwasher divided into pre-rinsing, cleaning, intermediate rinsing, rinsing and drying,
- Figure 3
- 1 shows a block diagram for the reference value calculation for the T-exercise sensor,
- Figure 4
- the block diagram of a control circuit for setting the operating point of the turbidity sensor.
Die Erfindung geht gemäß Fig. 1 von einer elektronisch programmgesteuerten Geschirrspülmaschine (1) als wasserführendes Haushaltgerät aus, deren manuell oder automatisch anwählbare Spülprogramme (SP) jeweils Programmabschnitte, wie Vorspülen (V), Reinigen (R), Zwischenspülen (ZW), Klarspülen (K) und Trocknen (T) gemäß Fig. 2 aufweisen, wobei je nach festgestelltem Verschmutzungsgrad des geladenen Geschirrs bzw. der im Umlauf befindlichen Spülflüssigkeit die Vorspül- und/oder Zwischenspülgänge aus- oder zusätzlich eingesteuert werden können. Nach dem letzten Programmabschnitt Klarspülen (K) schließt sich regelmäßig der Programmabschnitt Trocknen (T) an, wobei weiterhin beim Start des Spülprogramms (SP) allgemein vor dem Vorspülen (V) der geräteeigene Enthärter nach dem Regenerieren mit klarem Frischwasser durchgespült wird (Abpumpschritt A). Das Einspülen der Salzlösung in den Enthärter zum Regenerieren (RE) erfolgt allgemein nach dem Klarspülen (K), wobei das Regenerieren sich im Programmabschnitt Trocknen (T) fortsetzt. Solche Geschirrspülmaschinen weisen im wesentlichen Bauelemente und Zubehör auf, wie dies in Fig. 1 bei dem gezeigten Gerät vereinfacht dargestellt ist, wobei der besseren Übersicht halber die konkrete Ausbildung der Programmsteuerung (P) der Geschirrspülmaschine (1) jedoch nicht näher gezeigt ist.1, the invention is based on an electronically program-controlled dishwasher (1) as a water-bearing household appliance, its manual or automatic selectable wash programs (SP) each program section, such as pre-wash (V), cleaning (R), intermediate rinsing (ZW), rinsing (K) and drying (T) according to FIG. 2, with each after the degree of soiling of the loaded dishes or in circulation the pre-rinse and / or intermediate rinse cycles located in or additionally can be controlled. After the last program section rinse aid (K) closes Regularly the drying section (T) starts, while continuing at the start of the washing program (SP) generally before pre-rinsing (V) the device's own softener after regeneration is rinsed with clear fresh water (pumping step A). Washing in the Saline in the softener for regeneration (RE) is generally done after rinsing (K), the regeneration continues in the Drying (T) program section. Such dishwashers essentially have components and accessories, as shown in FIG. 1 the device shown is shown in simplified form, the sake of clarity concrete training of the program control (P) of the dishwasher (1), however, not is shown in more detail.
Die mit (1) bezeichnete und schematisch dargestellte frontseitig zu beladende Haushalt-Geschirrspülmaschine
besitzt gemäß Fig. 1 einen Spülbehälter (2) und mehrere Sprüharme (3,
4, 5), die über und zwischen Geschirrkörben (6, 7) und einem separaten Besteckkorb (8) in
unterschiedlichen Spülebenen im Spülbehälter (2) angeordnet sind. Die Sprüharme (3, 4, 5)
werden über zugeordnete Zuleitungen (11, 12) von der umlaufenden Spülflüssigkeit (13) einer
vorgeschalteten Umwälzpumpe (9) gespeist, wobei die Spülflüssigkeit im Spülbetrieb ständig
über eine Filtersiebkombination (10) geführt wird, die aus einem im Spülbehälterboden
angeordneten Feinsieb sowie aus einem Grobsieb und einem Feinstsieb besteht. Dort werden
Speisereste aus der Spülflüssigkeit (13) herausgefiltert. Der Besteckkorb (8) ist als Besteckschublade
ausgebildet und in einer von den Geschirrkörben (6, 7) getrennten Spülebene über
den beiden übereinander liegenden separaten Geschirrkörben (6, 7) im Spülbehälter (2) mit
einem eigenen Sprüharm (5) angeordnet.The (1) designated and schematically shown front-
Die dem Spülbehälter (2) zum Geschirrspülen über einen Frischwasseranschluss (14) und den Enthärter zugeführte Spülflüssigkeitsmenge ist weitestgehend von der Menge des zu reinigenden Geschirrs abhängig gesteuert. Darüber hinaus sind im Spülbetrieb zuzuführende Spülwassermengen oder Flüssigkeitswechsel auch von den sich einstellenden Geschirrverschmutzungen abhängig, die sich durch entsprechende Spülwassertrübungen insbesondere beim Vorspülen (V) und Reinigen (R) einstellen.The washing container (2) for dishwashing via a fresh water connection (14) and The amount of rinsing liquid supplied is largely dependent on the amount of depending on cleaning dishes. In addition to be fed in the flushing operation Amounts of rinse water or change of liquid also from the soiling of the dishes dependent, which is characterized in particular by corresponding rinse water turbidity adjust for pre-rinsing (V) and cleaning (R).
Um den Programmlauf in Abhängigkeit von der jeweiligen Geschirranschmutzung zu steuern, weist die Geschirrspülmaschine (1) einen optischen Sensor in Form eines an sich bekannten Trübungssensors (15) auf, welcher mit der Programmsteuerung (P) verbunden zu vorgegebenen Zeitpunkten in den vorerwähnten Programmabschnitten jeweils die Trübung der Spülflüssigkeit feststellt und ein dem ermittelten Verschmutzungsgrad entsprechendes Mess-Signal liefert, welches aufgrund am Messort sich einstellender Bauelemente- und/oder Lichtdurchlässigkeit-Toleranzen bzw. Exemplarstreuungen der Sensoren mit einem abgespeicherten Kalibrier- oder Referenzwert (RW) korrigiert werden muss. Der Trübungssensor (15) bzw. dessen Messort ist beispielsweise in den Sammeltopf der Geschirrspülmaschine unterhalb der Filtersiebkombination (10) gelegt.In order to control the program run depending on the soiling of the dishes, the dishwasher (1) has an optical sensor in the form of a known sensor Turbidity sensor (15), which is connected to the program control (P) to predetermined At times in the aforementioned program sections the cloudiness of the Detects rinsing liquid and a measurement signal corresponding to the determined degree of contamination delivers which due to component and / or Light transmission tolerances or specimen scatter of the sensors with a stored one 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).
Der eingesetzte Trübungssensor (15) arbeitet nach dem Lichtschrankenprinzip und besteht aus einem durchsichtigen Kunststoffrohr, durch welches das zu messende Medium (Spülwasser) fließt. Im rechten Winkel zum Kunststoffrohr ist eine optische Messstrecke bestehend aus einem optischen Sender (Leuchtdiode, Lampe oder dergl.) und einem optischen Empfänger (Fototransistor oder dergl.) aufgebaut. Ausgewertet wird die durch die Trübung verursachte Dämpfung des Lichtes innerhalb der Messstrecke. Der Aufbau des Trübungssensors (15) ist an sich bekannt und deshalb nicht näher dargestellt. Trübungssensoren weisen untereinander aufgrund der Bauelemente-Toleranzen, der Ausrichtung der optischen Bauelemente und der Toleranzen in der Lichtdurchlässigkeit des Kunststoffes sehr starke Streuungen auf. Zusätzliche Streuungen entstehen durch die Bauelemente-Toleranzen der äußeren Beschaltung des Sensors. Darüber hinaus können Ablagerungen (z. B. Kalk) und/oder Beschädigungen der Rohr-Oberfläche innerhalb der Messstrecke sowie die Alterung der optischen Bauelemente zu einer Verfälschung der Messergebnisse führen.The turbidity sensor (15) used works on the light barrier principle and consists of a transparent plastic tube through which the medium to be measured (rinsing water) flows. At right angles to the plastic tube there is an optical measuring section an optical transmitter (light-emitting diode, lamp or the like) and an optical receiver (Photo transistor or the like.) Built. The one caused by the turbidity is evaluated Attenuation of the light within the measuring section. The construction 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 on very strong scatter. additional Scattering results from the component tolerances of the external wiring of the Sensor. In addition, deposits (e.g. lime) and / or damage to the Pipe surface within the measuring section as well as the aging of the optical components falsify the measurement results.
Um einen Referenzwert (RW) zu bestimmen, mit welchem die im Verlauf des Spülprogramms (SP) beispielsweise in den Programmabschnitten Vorspülen (V), Reinigen (R), Zwischenspülen (ZW) zu Zeitpunkten (t'1 bis t'3) gemessenen Trübungswerte (TW) zu korrigieren sind, werden erfindungsgemäß mehrere Kalibrierwertmessungen (KWM) - im Ausführungsbeispiel drei Messungen - innerhalb eines Spülprogramms (SP) jeweils zu den Zeitpunkten (t1 bis t3) durchgeführt, an denen sich mit hoher Wahrscheinlichkeit klares Wasser am Messort des Trübungssensors (15) befindet.To determine a reference value (RW) with which the in the course of the washing program (SP) for example in the program sections Prewash (V), Clean (R), Interim rinse (ZW) turbidity values (TW) measured at times (t'1 to t'3) are to be corrected According to the invention, several calibration value measurements (KWM) - three in the exemplary embodiment Measurements - within a washing program (SP) at the times (t1 to t3) carried out where there is a high probability of clear water at the measuring location of the Turbidity sensor (15) is located.
Es wird eine erste Kalibrierwertmessung (KWM1) zu Programmbeginn, vorzugsweise im Abpumpschritt (A) beim Ausspülen des Enthärters, die zweite Messung im Klarspülgang (K) vor der Klarspülmitteldosierung zum Zeitpunkt (t2) sowie die dritte Kalibrierwertmessung (KWM3) am Ende des Programmabschnitts Trocknen (T) zum Zeitpunkt (t3) durchgeführt. Die drei Kalibrierwertmessungen (KWM1 bis KWM3) ergeben entsprechende Kalibriermesswerte (KW1 bis KW3).A first calibration value measurement (KWM1) is carried out at the start of the program, preferably in Pumping-out step (A) when rinsing out the softener, the second measurement in the final rinse cycle (K) the rinse aid dosage at time (t2) and the third calibration value measurement (KWM3) at the end of the program section drying (T) at time (t3). The three Calibration value measurements (KWM1 to KWM3) result in corresponding calibration measurement values (KW1 to KW3).
Die Kalibriermesswerte (KW) aus mehreren Spülprogrammen (SP) werden in einer ersten Speichertabelle (ST1) gemäß Fig. 3 abgespeichert und aus den gewonnenen Messwerten wird der beste Kalibriermesswert (KWb) selektiert und separat in einer zweiten Speichertabelle (ST2) abgespeichert. Anschließend wird die erste Speichertabelle (ST1) wieder gelöscht und es werden wie vorbeschrieben erneut Kalibriermesswerte (KW) in nachfolgenden Spülprogrammen (SP) erfasst und im ersten Speicher hinterlegt, worauf bei aufgefüllter erster Speichertabelle (ST1) wieder der beste Wert (KWb) selektiert und in die zweite Speichertabelle (ST2) eingeschrieben wird, usw. Sobald die zweite Speichertabelle (ST2) mit besten Kalibriermesswerten (KWb) vollgeschrieben ist, wird durch Wertmittlung der selektierten besten Werte der für die Trübungswertkorrekturen benötigte Kalibrier- oder Referenzwert (RW) ermittelt. Die im Spülverlauf nachfolgender Spülprogramme zu bestimmten Zeitpunkten abgefragten Trübungswerte (TW) werden dann mit dem ermittelten Kalibrier- oder Referenzwert (RW) korrigiert.The calibration measured values (KW) from several wash programs (SP) are stored in a first one Storage table (ST1) according to FIG. 3 is saved and the measurement values obtained are used the best calibration measured value (KWb) selected and separately in a second memory table (ST2) saved. Then the first memory table (ST1) is deleted again and it calibration values (KW) in subsequent washing programs as described above (SP) recorded and stored in the first memory, whereupon the first memory table is filled up (ST1) again selected the best value (KWb) and into the second memory table (ST2) is written, etc. As soon as the second memory table (ST2) with the best calibration measurements (KWb) is written in full, by averaging the selected best values for the turbidity value corrections required calibration or reference value (RW) determined. The in Rinsing process of subsequent rinsing programs queried at certain times Turbidity values (TW) are then compared with the determined calibration or reference value (RW) corrected.
Da jeweils der beste Kalibriermesswert (KWb) aus einer Messwertreihe zur späteren Mittelwertberechnung selektiert wird, d. h. der Wert, bei dem die Spülwassertrübung am geringsten ist (im Idealfall klares Wasser), ist sichergestellt, dass immer der optimalste Referenzwert (RW) zur Trübungswert-Korrektur herangezogen wird. Bei z. B. drei Kalibrierwertmessungen (KWM) pro Spülprogramm (SP) kann mit größter Wahrscheinlichkeit davon ausgegangen werden, dass der selektierte Kalibriermesswert (KW) derjenige Wert ist, bei dem klare Spülflüssigkeit vorgefunden wurde.Since the best calibration measured value (KWb) from a series of measured values for later calculation of the mean is selected, d. H. the value at which the rinse water turbidity is lowest is (ideally clear water), it is ensured that the optimal reference value (RW) is always is used to correct the turbidity value. At z. B. three calibration value measurements (KWM) per washing program (SP) can be assumed with the greatest probability that the selected calibration measurement value (KW) is the value for which clear rinsing liquid was found.
Nachfolgend ist die Kalibrierwertmessung näher beschrieben, wobei davon ausgegangen wird, dass in einem Spülprogramm (SP) zu verschiedenen Zeiten (t; t') drei Kalibrierwerte (KW) sowie drei Trübungswerte (TW) abgefragt werden.The calibration value measurement is described in more detail below, assuming that in a washing program (SP) at different times (t; t ') three calibration values (KW) as well as three turbidity values (TW) are queried.
Da mit der ersten Inbetriebnahme der Geschirrspülmaschine am Aufstellort noch keine Kalibriermesswerte (KW) vorliegen, wird werksseitig ein bei klarem Frischwasser gewonnener Referenzwert (z. B. RW0) als Bezugs-Korrekturwert bei der Trübungswertmessung vorgegeben, der für eine erste beispielsweise acht Spülprogramme (SP1 bis SP8) umfassende Spülprogrammgruppe gilt. Hierbei wird auf die Fig. 3 Bezug genommen.Since none with the first start-up of the dishwasher at the installation site Calibration measurement values (KW) are available at the factory, if the fresh water is clear Reference value (e.g. RW0) specified as a reference correction value for the turbidity value measurement the first, for example, comprising eight washing programs (SP1 to SP8) Rinsing program group applies. Here, reference is made to FIG. 3.
Zur Berechnung des neuen Referenzwertes (RW1) werden die aus den drei Kalibrierwertmessungen (KWM1-1 bis KWM3-1) im ersten Spülprogramm (SP1) gewonnenen Kalibriermesswerte (KW1-1 bis KW3-1) sowie die aus dem nachfolgenden zweiten Spülprogramm (SP2) ermittelten Kalibriermesswerte (KW1-2 bis KW3-2) in die erste Speichertabelle (ST1) des wiederbeschreibbaren, nichtflüchtigen Speichers (EEPROM) der Programmsteuerung (P) separat hinterlegt, wobei jeder ermittelte Kalibriermesswert (KW1-1 bis KW3-2) am Messort sich einstellende Bauelemente- und/oder Lichtdurchlässigkeit-Toleranzen mitberücksichtigt.To calculate the new reference value (RW1), the three calibration value measurements are used (KWM1-1 to KWM3-1) calibration measurement values obtained in the first washing program (SP1) (KW1-1 to KW3-1) as well as those from the following second washing program (SP2) determined calibration measurement values (KW1-2 to KW3-2) in the first memory table (ST1) of the rewritable, non-volatile memory (EEPROM) of the program control (P) stored separately, with each determined calibration measurement value (KW1-1 to KW3-2) at the measurement location adjusting component and / or light transmission tolerances are taken into account.
Bei Erreichen der vorgegebenen Anzahl (sechs Werte) von hinterlegten Kalibriermesswerten (KW) wird dann der beste Kalibriermesswert (KWb1-2) aus zwei Spülprogrammen (SP1, SP2) aus der Speichertabelle (ST1) abgerufen und einer ebenfalls mehrere Speicherplätze (für vier Werte) aufweisenden zweiten Speichertabelle (ST2) des Speichers zugeführt. Danach wird die erste Speichertabelle (ST1) gelöscht und neue Kalibriermesswerte aus nachfolgenden Kalibrierwertmessungen (KWM1-3 bis KWM3-3 und KWM1-4 bis KWM3-4) zweier weiterer Spülprogramme (SP3, SP4) werden in diese Speichertabelle (ST1) eingespeichert. Der beste Kalibriermesswert (KWb3-4) wird wiederum abgespeichert usw.When the specified number (six values) of stored calibration measurement values is reached (KW) then becomes the best calibration measurement value (KWb1-2) from two washing programs (SP1, SP2) retrieved from the memory table (ST1) and one also several memory locations (for four Values) having the second memory table (ST2) of the memory. After that the first memory table (ST1) deleted and new calibration measurement values from subsequent ones Calibration value measurements (KWM1-3 to KWM3-3 and KWM1-4 to KWM3-4) of two more Rinse programs (SP3, SP4) are stored in this memory table (ST1). The best Calibration measurement value (KWb3-4) is stored again, etc.
Aus den gespeicherten besten Kalibriermesswerten (KWb1-2 bis KWb7-8) der zweiten Speichertabelle (ST2) wird der Mittelwert berechnet, welcher den neuen Referenzwert (RW1) bildet und den werksseitig vorgegebenen Referenzwert (RW0) ersetzt. Die Speichertabelle (ST2) wird anschließend gelöscht und für eine neue Wertaufnahme vorbereitet. Die Trübungsmesswerte (TW) nachfolgender Spülprogramme (ab SP9 bis SP16) werden mit dem neu ermittelten Referenzwert (RW1) korrigieren, usw.From the stored best calibration measurement values (KWb1-2 to KWb7-8) of the second Storage table (ST2) the mean value is calculated, which is the new reference value (RW1) forms and replaces the factory-set reference value (RW0). The memory table (ST2) is then deleted and prepared for a new valuation. The turbidity measurements (TW) subsequent washing programs (from SP9 to SP16) are new with the correct the determined reference value (RW1), etc.
Um die Kalibrierung des Trübungssensors (15) durchzuführen, wird der optische Sender (Leuchtdiode oder dergl.) des Trübungssensors (15) an einer einstellbaren Konstantstromquelle (IK), Fig. 4, betrieben. Mit Hilfe der Konstantstromquelle (IK) kann die Lichtleistung des optischen Senders innerhalb vorgegebener Toleranzgrenzen von einem Steuerungsrechner (SR) der Programmsteuerung (P) durch ein Steuersignal (Stellgröße y) beeinflusst werden. Nach einer Signalaufbereitung in (16) beeinflusst das vom Trübungssensor (15) kommende Spannungssignal (Messsignal x) den Steuerungsrechner (SR). Mit (z) wird das Messmedium bezeichnet, das durch Dämpfung der optischen Strecke des Trübungssensors (15) auf den im Blockschaltbild gemäß Fig. 4 gezeigten Regelkreises wirkt.To carry out the calibration of the turbidity sensor (15), 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 means of a control signal (manipulated variable y) to be influenced. After signal conditioning in (16), this affects the turbidity sensor (15) coming voltage signal (measurement signal x) the control computer (SR). With (z) it will Designated measuring medium by damping the optical path of the turbidity sensor (15) acts on the control circuit shown in the block diagram according to FIG. 4.
Zur Kompensation aller Bauteil-Toleranzen bzw. Exemplarstreuungen wird die Lichtleistung des optischen Senders jeweils so gewählt, dass sich bei klarem Spülwasser am Messort immer ein definierter Arbeitspunkt (Y0; X0) des optischen Empfängers (Fototransistor oder dergl.) des Trübungssensors (15) einstellt.To compensate for all component tolerances or sample variations, the light output of the optical transmitter is selected so that a clear operating point (Y 0 ; X 0 ) of the optical receiver (photo transistor or the like) of the turbidity sensor (15 ) sets.
Hingegen wird zur Kompensation von Ablagerungen innerhalb der Messstrecke am Messort und von Beschädigungen der Rohroberfläche innerhalb der Messstrecke des Sensors sowie zur Kompensation der Alterung der Bauelemente eine zusätzliche Stromreserve zur Erhöhung der Sende-Lichtleistung bereitgehalten, so dass weiterhin der gewählte Arbeitspunkt des optischen Empfängers benutzt werden kann.On the other hand, to compensate for deposits within the measuring section at the measuring location and damage to the pipe surface within the measuring section of the sensor and To compensate for the aging of the components, an additional power reserve to increase of the transmitted light output, so that the selected working point of the optical receiver can be used.
Der Zeitpunkt, zu welchem sich im laufenden Spülprogramm (SP) am Messort klares Wasser befindet, kann wie anfangs erwähnt nicht mit letzter Sicherheit bestimmt werden. Wohl aber können die Zeitpunkte (t1 bis t3) bestimmt werden, zu denen sich mit hoher Wahrscheinlichkeit klare Spülflüssigkeit (13) am Messort des Trübungssensors (15) befindet. Deshalb werden mehrere Kalibrierwertmessungen (KWM), im Ausführungsbeispiel drei Messungen, durchgeführt. Der jeweils beste Kalibriermesswert (KWb) ist gekennzeichnet durch den kleinsten Diodenstromwert, der zur Einstellung einer definierten Fototransistorspannung (am Arbeitswiderstand) nötig ist. Der letztlich aus mehreren besten Kalibriermesswerten (KWb) durch Wertmittlung errechnete Referenzwert (RW) stellt den einzustellenden Diodenstrom des Trübungssensors (15) dar, welcher ab dann zur Trübungsmessung eingesetzt wird. Verringert sich im Zuge der Trübungsmessungen beispielsweise die Leuchtstärke der Sendediode des Trübungssensors (15) mit der Lebensdauer, so wird dieses durch die kontinuierliche Erhöhung des Diodenstroms kompensiert.The point in time when there is clear water in the running wash program (SP) at the measuring location cannot be determined with absolute certainty, as mentioned at the beginning. But yes the times (t1 to t3) can be determined with a high probability clear rinsing liquid (13) is located at the measuring point of the turbidity sensor (15). Therefore be several calibration value measurements (KWM), three measurements in the exemplary embodiment, carried out. The best calibration measurement value (KWb) is identified by the smallest diode current value that is used to set a defined phototransistor voltage (am Working resistance) is necessary. Ultimately from several best calibration measurement values (KWb) the reference value (RW) calculated by value averaging represents the diode current to be set Turbidity sensor (15), which is then used for turbidity measurement. decreases the luminosity of the transmitter diode of the Turbidity sensor (15) with the service life, this is due to the continuous increase of the diode current compensated.
Zur Kompensation der Bauelemente- und/oder Lichtdurchlässigkeit-Toleranzen wird somit die Lichtleistung des optischen Senders des Trübungssensors innerhalb vorgegebener aus Bauelemente- und/oder Lichtdurchlässigkeit-Toleranzen ableitbarer Toleranzgrenzen variiert, um den definierten Arbeitspunkt zu erreichen. Es wird das Ansteuerungssignal X solange nachgeregelt, bis sich der definierte Arbeitspunkt (Y0; X0) auf der Übertragungskennlinie der gesamten Messstrecke einstellt. Aus jeweils "n" ermittelten Arbeitspunkten wird der günstigste ausgewählt. Jeweils "m" günstige Arbeitspunkte (gemessene Kalibrierwerte) werden gemittelt und ergeben den Referenzwert zur Korrektur der Trübungsmesswerte.To compensate for component and / or light transmission tolerances, the light output of the optical transmitter of the turbidity sensor is thus varied within predetermined tolerance limits that can be derived from component 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 ) is set on the transmission characteristic of the entire measuring section. The cheapest is selected from "n" working points. In each case "m" favorable working points (measured calibration values) are averaged and result in the reference value for correcting the turbidity measurement values.
Sofern es sich ergibt, dass das letzte gewählte Spülprogramm ein Vorspülen war, oder wenn das letzte Programm nicht ordnungsgemäß beendet wurde, so muss die Kalibrierwertmessung vor dem ersten Spülgang (also vor Programmbeginn) entfallen.If it turns out that the last selected wash program was a pre-wash, or if If the last program was not ended correctly, the calibration value measurement must be carried out before the first rinse cycle (i.e. before the start of the program).
Claims (7)
dadurch gekennzeichnet, dass mehrere Kalibrierwertmessungen (KWM1-1, KWM2-1, KWM3-1) innerhalb eines Spülprogramms (SP1; SP2) jeweils zu Zeitpunkten (t1, t2, t3) durchgeführt werden, an denen sich mit hoher Wahrscheinlichkeit klares Wasser am Messort des Trübungssensors (15) befindet,
dass Kalibriermesswerte (KW1-1, KW2-1, KW3-1; KW1-2, KW2-2, KW3-2) aus mehreren Spülprogrammen (SP1, SP2) abgespeichert werden, und dass aus den abgespeicherten Kalibriermesswerten (KW1-1, KW2-1, KW3-1; KW1-2, KW2-2, KW3-2) durch Selektion des besten Kalibriermesswertes (KWb1-2) und durch Wertmittlung der aus nachfolgenden Kalibrierwertmessungen (KWM1-3, KWM2-3, KWM3-3; KWM1-4, KWM2-4, KWM3-4; usw.) gewonnenen selektierten besten Kalibriermesswerte (KWb3-4, KWb5-6, KWb7-8) ein Kalibrier- oder Referenzwert (RW1) ermittelt wird,
und dass gemessene Trübungswerte (TW) nachfolgender Spülprogramme (SP) bis zur nächsten Referenzwert-Neubestimmung mit dem ermittelten Kalibrier- oder Referenzwert (RW1) korrigiert werden.Method for comparing and correcting a turbidity sensor in a program-controlled water-carrying household appliance, in particular in a dishwasher, to changing conditions at the measurement location, with calibration or reference values for the sensor adjustment and for correcting the turbidity sensor being determined during turbidity measurements of the washing liquid in the running washing program,
characterized in that several calibration value measurements (KWM1-1, KWM2-1, KWM3-1) are carried out within a rinsing program (SP1; SP2) at times (t1, t2, t3) at which clear water is likely to be at the measuring location the turbidity sensor (15),
that calibration measurement values (KW1-1, KW2-1, KW3-1; KW1-2, KW2-2, KW3-2) from several wash programs (SP1, SP2) are saved, and that from the saved calibration measurement values (KW1-1, KW2 -1, KW3-1; KW1-2, KW2-2, KW3-2) by selecting the best calibration measurement value (KWb1-2) and by determining the value of the subsequent calibration value measurements (KWM1-3, KWM2-3, KWM3-3; KWM1 -4, KWM2-4, KWM3-4; etc.) obtained selected best calibration measurement values (KWb3-4, KWb5-6, KWb7-8) a calibration or reference value (RW1) is determined,
and that measured turbidity values (TW) of subsequent rinsing programs (SP) are corrected with the determined calibration or reference value (RW1) until the next reference value is redetermined.
dadurch gekennzeichnet, dass Kalibriermesswerte (KW) von mindestens zwei aufeinanderfolgenden Spülprogrammen (SP) jeweils in einer Speichertabelle (ST1) separat hinterlegt werden, wobei jeder ermittelte Kalibriermesswert (KW) am Messort sich einstellende Bauelemente- und/oder Lichtdurchlässigkeit-Toleranzen mitberücksichtigt,
dass bei Erreichen einer vorgegebenen Anzahl von hinterlegten Kalibriermesswerten (KW) der beste Kalibriermesswert (KWb) aus der Speichertabelle (ST1) abgerufen und einer ebenfalls mehrere Speicherplätze aufweisenden zweiten Speichertabelle (ST2) zugeführt wird, worauf die erste Speichertabelle (ST1) gelöscht und neue Kalibriermesswerte (KW) aus nachfolgenden Kalibrierwertmessungen (KWM) in diese Tabelle eingespeichert werden, dass aus den gespeicherten besten Kalibriermesswerten (KWb) der zweiten Speichertabelle (ST-2) ein Mittelwert berechnet und der errechnete Wert als neuer Referenzwert (RW1) bei Trübungsmessungen nachfolgender Spülprogramme (SP) herangezogen wird.Method according to claim 1,
characterized in that calibration measurement values (KW) of at least two successive washing programs (SP) are each stored separately in a memory table (ST1), each calibration measurement value (KW) determined at the measurement location also taking into account the component and / or light transmission tolerances that arise,
that when a predetermined number of stored calibration measurement values (KW) is reached, the best calibration measurement value (KWb) is called up from the memory table (ST1) and is fed to a second memory table (ST2), which likewise has several memory locations, whereupon the first memory table (ST1) is deleted and new calibration measurement values (KW) from subsequent calibration value measurements (KWM) are stored in this table, that an average value is calculated from the best calibration measurement values (KWb) stored in the second memory table (ST-2) and the calculated value as a new reference value (RW1) for turbidity measurements of subsequent washing programs ( SP) is used.
dadurch gekennzeichnet, dass bei der mehrfachen Kalibrierwertmessung eine erste Messung im Spülprogramm (SP) zu Programmbeginn (Zeitpunkt t1), vorzugsweise im Abpumpschritt (A), eine weitere Messung im Klarspülgang (K) vor einer Klarspülmitteldosierung (Zeitpunkt t2) sowie eine dritte Kalibrierwertmessung am Ende (Zeitpunkt t3) des Programmabschnitts Trocknen (T) durchgeführt wird.The method of claims 1 and 2;
characterized in that in the case of multiple calibration value measurements, a first measurement in the wash program (SP) at the start of the program (time t1), preferably in the draining step (A), a further measurement in the rinse cycle (K) before a rinse aid dosage (time t2) and a third calibration value measurement on End (time t3) of the drying program section (T) is carried out.
dadurch gekennzeichnet, dass bei der ersten Inbetriebnahme des Gerätes am Aufstellort ein werksseitig vorgegebener Referenzwert (RW0) als Bezugs-Korrekturwert bei Trübungswertmessungen herangezogen wird.Method according to one or more of claims 1 to 3,
characterized in that when the device is commissioned for the first time at the installation site, a factory-set reference value (RW0) is used as the reference correction value for turbidity value measurements.
dadurch gekennzeichnet, dass zur Kompensation der Bauelemente- und/oder Lichtdurchlässigkeit-Toleranzen die Lichtleistung des optischen Senders des Trübungssensors (15) innerhalb vorgegebener aus Bauelemente- und/oder Lichtdurchlässigkeit-Toleranzen ableitbarer Toleranzgrenzen variiert wird.Method according to one or more of claims 1 to 4
characterized in that, in order to compensate for the component and / or translucency tolerances, the light output of the optical transmitter of the turbidity sensor (15) is varied within predetermined tolerance limits which can be derived from component and / or translucency tolerances.
dadurch gekennzeichnet, dass der optische Sender des Trübungssensors (15) an einer einstellbaren Konstantstromquelle (IK) betrieben wird, wobei die Kompensation von Bauteile-Toleranzen und Lichtdurchlässigkeits-Toleranzen der Messstrecke durch Nachregeln der Sende-Lichtleistung des optischen Senders auf einen vorbestimmten Arbeitspunkt des optischen Empfängers erfolgt.Method according to one or more of claims 1 to 5,
characterized in that the optical transmitter of the turbidity sensor (15) is operated on an adjustable constant current source (IK), the compensation of component tolerances and light transmission tolerances of the measuring section by readjusting the transmitted light output of the optical transmitter to a predetermined operating point of the optical Recipient.
dadurch gekennzeichnet, dass mehrere Trübungsmessungen innerhalb eines Spülprogramms (SP) durchgeführt werden.Method according to one or more of claims 1 to 6,
characterized in that several turbidity measurements are carried out within a washing program (SP).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10111006A DE10111006A1 (en) | 2001-03-07 | 2001-03-07 | Method for adjusting a turbidity sensor |
| DE10111006 | 2001-03-07 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1238623A2 true EP1238623A2 (en) | 2002-09-11 |
| EP1238623A3 EP1238623A3 (en) | 2003-08-13 |
| EP1238623B1 EP1238623B1 (en) | 2005-07-20 |
Family
ID=7676636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02003074A Expired - Lifetime EP1238623B1 (en) | 2001-03-07 | 2002-02-13 | Calibrating method of a turbidity sensor |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1238623B1 (en) |
| AT (1) | ATE299663T1 (en) |
| DE (2) | DE10111006A1 (en) |
| ES (1) | ES2241907T3 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7558690B2 (en) | 2004-07-23 | 2009-07-07 | Bsh Bosch Und Siemens Hausgeraete Gmbh | Method for calibrating sensors |
| CN100531661C (en) * | 2004-04-12 | 2009-08-26 | 乐金电子(天津)电器有限公司 | Program control method for dish washing machine |
| US9671339B2 (en) | 2014-12-09 | 2017-06-06 | Endress+Hauser Conducta Gmbh+Co. Kg | Method for determining a turbidity and turbidity sensor for implementing the method |
| CN111089862A (en) * | 2019-12-31 | 2020-05-01 | 中国科学院合肥物质科学研究院 | A standard turbidity calibration device that can be used in extreme environments and its calibration method |
| CN114391097A (en) * | 2019-08-02 | 2022-04-22 | 恩德莱斯和豪斯集团服务股份公司 | Mobile system for calibrating, verifying and/or adjusting a sensor and method for calibrating, verifying and/or adjusting a sensor |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10253009B3 (en) * | 2002-11-14 | 2004-04-08 | Whirlpool Corp., Benton Harbor | Method for operating dishwashing machine according to dirtiness of recirculated rinse water has turbidity sensors in circulation pump inlet measuring upper and lower rinse levels alternately |
| DE102005062388A1 (en) * | 2005-12-23 | 2007-06-28 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Measuring device e.g. turbidity measuring device, for laboratory reference process, involves updating instruction based on actual calibration and reference measuring values, where earlier values pair is considered for updating instructions |
| DE102007031480B4 (en) | 2007-07-06 | 2009-05-14 | BSH Bosch und Siemens Hausgeräte GmbH | Sensor device and method for detecting the turbidity of wash liquor |
| IT1392420B1 (en) † | 2008-12-22 | 2012-03-02 | Indesit Co Spa | DISHWASHER. |
| CN103315688B (en) * | 2012-12-28 | 2015-06-17 | 苏州韩博厨房电器科技有限公司 | Cleaning process of automatic dish-washing machine |
| CN102995133A (en) * | 2012-12-28 | 2013-03-27 | 徐州腾宇羽绒制品设备有限公司 | Feather washing and dewatering machine |
| DE102020212542A1 (en) | 2020-10-05 | 2022-04-07 | BSH Hausgeräte GmbH | Laundry care device with a control |
| 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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|---|---|---|---|---|
| US5048139A (en) * | 1985-01-08 | 1991-09-17 | Sharp Kabushiki Kaisha | Washing machine with a turbidimeter and method of operating same |
| DE19528978A1 (en) * | 1995-08-07 | 1997-02-13 | Bosch Siemens Hausgeraete | Method for comparing an optoelectronic device for determining a washing success in a washing machine or dishwasher |
| DE19705926A1 (en) * | 1997-02-17 | 1998-08-20 | Aeg Hausgeraete Gmbh | Household appliance with a measuring device for determining the degree of contamination of a cleaning liquid |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0793918B2 (en) * | 1992-02-04 | 1995-10-11 | 三洋電機株式会社 | Dishwasher controller |
-
2001
- 2001-03-07 DE DE10111006A patent/DE10111006A1/en not_active Ceased
-
2002
- 2002-02-13 EP EP02003074A patent/EP1238623B1/en not_active Expired - Lifetime
- 2002-02-13 DE DE50203654T patent/DE50203654D1/en not_active Expired - Lifetime
- 2002-02-13 AT AT02003074T patent/ATE299663T1/en not_active IP Right Cessation
- 2002-02-13 ES ES02003074T patent/ES2241907T3/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5048139A (en) * | 1985-01-08 | 1991-09-17 | Sharp Kabushiki Kaisha | Washing machine with a turbidimeter and method of operating same |
| DE19528978A1 (en) * | 1995-08-07 | 1997-02-13 | Bosch Siemens Hausgeraete | Method for comparing an optoelectronic device for determining a washing success in a washing machine or dishwasher |
| DE19705926A1 (en) * | 1997-02-17 | 1998-08-20 | Aeg Hausgeraete Gmbh | Household appliance with a measuring device for determining the degree of contamination of a cleaning liquid |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100531661C (en) * | 2004-04-12 | 2009-08-26 | 乐金电子(天津)电器有限公司 | Program control method for dish washing machine |
| US7558690B2 (en) | 2004-07-23 | 2009-07-07 | Bsh Bosch Und Siemens Hausgeraete Gmbh | Method for calibrating sensors |
| CN1988838B (en) * | 2004-07-23 | 2010-11-17 | Bsh博世和西门子家用器具有限公司 | Method for calibrating sensors |
| US9671339B2 (en) | 2014-12-09 | 2017-06-06 | Endress+Hauser Conducta Gmbh+Co. Kg | Method for determining a turbidity and turbidity sensor for implementing the method |
| CN114391097A (en) * | 2019-08-02 | 2022-04-22 | 恩德莱斯和豪斯集团服务股份公司 | Mobile system for calibrating, verifying and/or adjusting a sensor and method for calibrating, verifying and/or adjusting a sensor |
| CN114391097B (en) * | 2019-08-02 | 2024-06-11 | 恩德莱斯和豪斯集团服务股份公司 | Mobile system for calibrating, verifying and/or adjusting a sensor and method for calibrating, verifying and/or adjusting a sensor |
| CN111089862A (en) * | 2019-12-31 | 2020-05-01 | 中国科学院合肥物质科学研究院 | A standard turbidity calibration device that can be used in extreme environments and its calibration method |
| CN111089862B (en) * | 2019-12-31 | 2024-06-04 | 中国科学院合肥物质科学研究院 | Standard turbidity calibration device and calibration method for extreme environment |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1238623B1 (en) | 2005-07-20 |
| EP1238623A3 (en) | 2003-08-13 |
| DE50203654D1 (en) | 2005-08-25 |
| ES2241907T3 (en) | 2005-11-01 |
| DE10111006A1 (en) | 2002-11-07 |
| ATE299663T1 (en) | 2005-08-15 |
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