EP1180344A2 - Method to determine the dirt amount of the washing liquid for a programable dishwasher with turbidity sensor - Google Patents
Method to determine the dirt amount of the washing liquid for a programable dishwasher with turbidity sensor Download PDFInfo
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- 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
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- signal
- measurement
- washing liquid
- turbidity sensor
- rinsing
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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 '.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Ermittlung des Verschmutzungsgrades der Spülflüssigkeit bei einer mit einem Trübungssensor ausgestatteten programmgesteuerten Geschirrspülmaschine, wobei von der Änderung der Mess-Signale des Sensors, die entsprechend der Verunreinigung der Spülflüssigkeit mehr oder weniger verrauscht sind, eine Aussage über den jeweiligen Grad der Verschmutzung der Spülflüssigkeit zur Steuerung des Spülprozesses getroffen wird.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.
Bei programmgesteuerten Geschirrspülmaschinen ist ein solches Verfahren zur Optimierung des Spülprogrammlaufs bei einem wasser- und energiesparenden Betrieb sowie zur Erzielung guter Reinigungsergebnisse bekannt. Die bei dem Verfahren eingesetzte Trübungssensorik besteht aus einem lichtgebenden Element, z. B. eine Leuchtdiode (LED), sowie aus einem lichtaufnehmenden Element, z. B. einem Fototransistor, wobei die auf Verschmutzung zu sensierende Spül- oder Reinigungsflüssigkeit entweder direkt durch den Strahlengang (Meßstrecke) der Optik geleitet wird (sh. DE 41 22 988 A1), oder durch Reflektion abgetastet wird (sh. US 3 888 269). Beim Durchlichtprinzip durchdringt das Licht die Spülflüssigkeit, wobei entsprechend den Verunreinigungen der Spülflüssigkeit verrauschte analoge Mess-Signale von mehr oder weniger hohen Spannungspegeln am Ausgang des Lichtempfängers erzeugt werden. Die verrauschten Mess-Signale kennzeichnen den jeweiligen Grad der Verschmutzung der Spülflüssigkeit und werden nach entsprechender digitaler Signalaufbereitung und Verstärkung zur Steuerung des Spülprozesses herangezogen. Beispielsweise veranlasst eine Messung der Trübung der Spülflüssigkeit beim Vorspülen oder Zwischenspülen des Geschirrs eine Entscheidung über einen Wasserwechsel bzw. einen zusätzlichen Spülgang vor bzw. nach dem Programmabschnitt Reinigen. Auch kann die Entscheidung für den Programmlauf bei wenig verschmutzter Spülflüssigkeit so getroffen werden, dass vom Vorspülen unmittelbar, d.h. ohne ein Abpumpen von Flüssigkeit in den Programmabschnitt Reinigen eingestiegen wird (sh. amerikanische Patentschrift US 3 888 269). Dem dafür eingesetzten optischen Sensor haftet jedoch der Nachteil an, dass zwar stark trübende Anschmutzungen erkannt werden können, stark partikelhaltige jedoch nicht. Solche Spülwasserverschmutzungen werden beispielsweise durch nicht oder nur gering auflösbare Schmutzteilchen, wie Spinatreste oder ähnl., die in der Spülflüssigkeit "schwimmen", verursacht. Das Erkennen auch solcher Verunreinigungen, die teilweise aufgrund ihrer geringen Partikelgröße von den installierten Sieben des Gerätes nicht abgefangen werden, ist wünschenswert, damit diese nicht in den abschließenden Programmabschnitt Klarspülen verschleppt werden, wodurch das Spülergebnis negativ beeinflusst wird. Hier soll die Erfindung Abhilfe schaffen. In the case of program-controlled dishwashers, such a method is for optimization the rinse program run in a water and energy saving operation and to achieve good cleaning results known. 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). With the transmitted light principle, 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. For example, 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. Also, the decision to run the program can be done with little dirt Rinsing liquid so that pre-rinsing immediately, i.e. without one Pumping liquid is entered in the cleaning program section (see American U.S. Patent No. 3,888,269). However, the optical sensor used for this is liable the disadvantage of the fact that heavily clouding soiling can be recognized, heavily particle-containing However not. Such rinsing water contamination is caused, for example, by dirt particles that are not or only slightly dissolvable, such as spinach residues or the like, which are in the rinsing liquid "swim" caused. Detection of such contaminants, some of them due to their small particle size not caught by the installed sieves of the device is desirable so that it does not enter the final program section Rinse aid is delayed, which has a negative impact on the rinsing result. Here the invention is intended to remedy the situation.
Erfindungsgemäß wird dieses Problem mit den Verfahrensmerkmalen des Patentanspruchs 1
gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den
nachfolgenden Unteransprüchen.According to the invention, this problem is solved with the method features of
Durch die Erfindung ist es vorteilhaft möglich, die durch die Meßstrecke des optischen Sensors "schwimmenden" Partikel, die für kurze Augenblicke jeweils das Licht der Optik absorbieren, als Signalsprünge herauszufiltern und in verwertbare Signale umzuwandeln. Die digitalisierten Signalsprünge sind anschließend mittels des Rechners der elektronischen Geräte-Programmsteuerung auswertbar und steuern den Programmlauf der Geschirrspülmaschine entsprechend der jeweils ermittelten Verschmutzungsart und -menge.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.
Die Erfindung ist nachstehend anhand von drei Zeichnungen rein schematisch dargestellt und näher beschrieben. 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- ein Signaldiagramm vom Ausgangssignal des Trübungsmessers,
Figur 3- für die Auswertung in der Elektronik des Gerätes aufbereitete Ausgangssignale des Trübungssensors in einem weiteren Signaldiagramm.
- 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 signal diagram of the output signal of the opacimeter,
- Figure 3
- output signals of the turbidity sensor prepared for evaluation in the electronics of the device in a further signal diagram.
Die Erfindung geht aus von einer elektronisch programmgesteuerten Geschirrspülmaschine (1), deren manuell oder automatisch anwählbare Spülprogramme jeweils separate Programmabschnitte, wie Vorspülen, Reinigen, Zwischenspülen und Klarspülen aufweisen, wobei je nach festgestelltem Verschmutzungsgrad des in die Maschine geladenen Geschirrs bzw. der Spülflüssigkeit die Vorspül- und/oder Zwischenspülgänge aus- oder zusätzlich eingesteuert werden können. Nach dem letzten Programmabschnitt Klarspülen schließt sich in der Regel ein Programmabschnitt Trocknen an. Solche Geschirrspülmaschinen gehören zum allgemeinen Stand der Technik und weisen im wesentlichen Bauelemente und Zubehör auf, wie dies in Fig. 1 bei dem gezeigten Haushaltgerät vereinfacht dargestellt ist. Auf die konkrete Darstellung der nur beispielhaft als Blockbild gezeigten Programmsteuerung (13) des Gerätes ist der besseren Übersicht halber verzichtet worden.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.
Die mit (1) bezeichnete und schematisch dargestellte frontseitig zu beladende Haushalt-Geschirrspülmaschine besitzt 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 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 (17) 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-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.
Vor der Anwahl eines Spülprogramms werden die zu reinigenden Geschirrteile in die Geschirrkörbe (6, 7) sowie die einzelnen Besteckteile der Maßgedecke in dem Besteckkorb (8) sortiert abgelegt. Je nach Geschirrmenge können dabei die Geschirrkörbe (6, 7) vollständig oder nur zum Teil beladen werden. Nach der Spülprogrammwahl wird zum Spülbeginn ein im Frischwasserzulauf (14) des Gerätes in bekannter Weise liegendes Magnetventil für den Spülwassereinlauf zum Spülbehälter (2) geöffnet. Ab einem bestimmten Wasserstand im Spülbehälter (2) wird die Frischwasserzufuhr unterbrochen und die Sprüharme (3, 4, 5) werden bei eingeschalteter Umwälzpumpe (9) mit der zugeführten Spülflüssigkeit versorgt und rotieren. Die dem Spülbehälter (2) zum Geschirrspülen zugeführte Spülflüssigkeitsmenge ist weitestgehend von der Menge des zu reinigenden Geschirrs abhängig gesteuert. Darüber hinaus sind im Spülbetrieb zuzuführende Spülwassermengen oder Flüssigkeitswechsel auch von sich einstellenden Geschirrverschmutzungen abhängig. Insbesondere können sich Spülwasserverschmutzungen, die beispielsweise von nicht oder nur schwer auflösbaren Schmutzteilchen, wie Spinatreste oder ähnl., die in der Spülflüssigkeit "schwimmen", herrühren, negativ auf das Spülergebnis auswirken. Hier setzt die Erfindung ein.Before selecting a washing program, 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. After the wash program has been selected, 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.
Um derartige Schmutzpartikel zu erkennen und in Abhängigkeit davon den Programmlauf automatisch zu steuern, ist ein optischer Sensor in Form eines bekannten Trübungssensors (15) vorgesehen, welcher mit der Programmsteuerung verbunden zu vorgegebenen Zeitpunkten in den vorerwähnten Programmabschnitten, wie Vorspülen, Reinigen und/oder Zwischenspülen, beispielsweise nach dem Zuführen von Frischwasser in den Spülbehälter (2) der Geschirrspülmaschine (1), jeweils die Trübung der bewegten Spülflüssigkeit feststellt und ein dem ermittelten Verschmutzungsgrad entsprechendes Mess-Signal (16) liefert. Solche Mess-Signale (16) sind in den Signaldiagrammen gemäß Fig. 2 und 3 abgebildet.In order to recognize such dirt particles and, depending on this, the program run automatically to be controlled, an optical sensor in the form of a known turbidity sensor (15) provided, which is connected to the program control at predetermined times in the aforementioned program sections, such as pre-rinsing, cleaning and / or intermediate rinsing, for example after the supply of fresh water into the washing container (2) of the dishwasher (1), each determines the turbidity of the moving rinsing liquid and one determined Degree of pollution corresponding measurement signal (16) provides. Such measurement signals (16) are shown in the signal diagrams according to FIGS. 2 and 3.
Die verwendete Trübungs-Meßsensorik besteht aus einem lichtgebenden Element (15a), z. B. eine Leuchtdiode (LED), sowie aus einem lichtaufnehmenden Element (15b), z. B. einem Fototransistor, wobei die auf Verschmutzung zu sensierende Spül- oder Reinigungsflüssigkeit (17) direkt durch den Strahlengang der Optik in einer vorzugsweise beruhigten Mess-Strecke (18) geleitet wird. Die Messung erfolgt daher bei mäßig bewegter Spülflüssigkeit. Zur Ausbildung einer so beruhigten Mess-Strecke (18) ist der Trübungssensor (15) vorteilhaft im Wasserlauf zum oberen Sprüharm (5) beispielsweise in einem Bypass (19) oder parallelen Nebenweg der Sprüharm-Zuleitung (12) angeordnet. Die beruhigte Mess-Strecke (18) kann aber auch der Zuleitung zu einem anderen Sprüharm der Geschirrspülmaschine (1) parallelgeschaltet werden. Dabei ist sichergestellt, dass ggf. vorhandene Luftblasen separiert und nicht als Schmutzpartikel detektiert werden können.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. For training In such a calmed measuring section (18), 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.
Der eingesetzte Trübungssensor (15) arbeitet im Durchlichtverfahren. Bei diesem Prinzip durchdringt das Licht die Spülflüssigkeit (17), wobei entsprechend der Verunreinigung der Spülflüssigkeit das mehr oder weniger große analoge Mess-Signal (16) am Ausgang des Lichtempfängers (15b) erzeugt wird. Von der Änderung der Mess-Signale (16) des Trübungssensors (15), die entsprechend der Verunreinigung der Spülflüssigkeit mehr oder weniger verrauscht sind, wird eine Aussage über den jeweiligen Grad der Verschmutzung der Spülflüssigkeit zur Steuerung des Spülprozesses getroffen.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.
Die durch die Mess-Strecke (18) des Trübungssensors (15) "schwimmenden" Partikel, absorbieren für kurze Augenblicke jeweils das Licht der Optik, wobei das erzeugte Mess-Signal (16) entsprechende Signalsprünge (20) gemäß Fig. 2 und 3 erzeugt. Das erfindungsgemäße Verfahren sieht vor, diese Signalsprünge (20) herauszufiltern und in verwertbare Signale umzuwandeln. Hierdurch ist eine Erkennung der Schmutzpartikelkonzentration und auch eine Feststellung der Partikelgrößen (Breite der Signalsprünge 20) sowie der Anzahl der in der Spülflüssigkeit (17) vorhandenen Schmutzpartikel möglich. Das verrauschte Mess-Signal (16), Fig. 2, wird gefiltert und verstärkt. Dazu wird das vom Trübungssensor (15) gelieferte Mess-Signal (16) über ein nicht gezeigtes Hochpassfilter, einen Verstärker sowie über eine Invertierstufe geleitet.Absorb the particles "floating" through the measuring section (18) of the turbidity sensor (15) the light of the optics for brief moments, 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. For this purpose, the measurement signal (16) supplied by the turbidity sensor (15) passed through a high-pass filter, not shown, an amplifier and an inverting stage.
Nach Digitalisierung der Signalsprünge (20) des modifizierten Mess-Signals (16'), sh. Fig. 3, wird durch den geräteeigenen Rechner der elektronischen Programmsteuerung (13) des Haushaltgerätes die Auswertung der Signale erfolgen, worauf der Programmlauf der Geschirrspülmaschine (1) gemäß der ermittelten Verschmutzungsart und -menge entsprechend hinsichtlich Ein- und/oder Ausblenden von Wasserwechseln verändert wird. Die Signalauswertung kann beispielsweise so sein, dass die gemäß Fig. 3 erzeugten Signalmuster der digitalisierten Mess-Signale (16') mit im Rechner der Geräteelektronik in einem programmierbaren Speicher beispielsweise abgespeicherten Signalbildern verglichen werden, welche bestimmten Verschmutzungsarten, Anschmutzungen, Partikeln und dergl. zugeordnet sind. Aus der Häufigkeit und der jeweiligen Dauer des Signaleinbruchs (20) im Mess-Signal schließt der Rechner dann auf die Anzahl und Größe der Partikel in der Spülflüssigkeit sowie auf deren Schmutzkonzentration. Abhängig vom Vergleichsergebnis wird dann in den Programmlauf des Gerätes eingegriffen. After digitization of the signal jumps (20) of the modified measurement signal (16 '), see. Fig. 3, is through the device's own computer of the electronic program control (13) of the household appliance the signals are evaluated, followed by the program run of the dishwasher (1) according to the determined type and quantity of pollution with regard to Showing and / or hiding water changes is changed. 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.
Jedoch kann auch eine andere Signal-Auswertung, bspw. durch ein Aufintegrieren, Hochzählen von Signalsprüngen oder ähnl. erfolgen.However, another signal evaluation, for example by integrating, counting up of signal jumps or similar. respectively.
Der Kurvenverlauf in den Fig. 2 und 3 stellt anschaulich das vom Trübungssensor (15) gelieferte Mess-Signal und die daraus abgeleiteten Signalformen über Signaldauer (T) und Signalhöhe (Spannung U) dar.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).
Die Fig. 2 zeigt einen möglichen Signalverlauf des Mess-Signals (16), wie er bei einer mit Spinat verschmutzten Spülflüssigkeit (17) typisch ist. Ähnliche Signalkurven ergeben sich bei Partikeln von Brotkrümel usw. Die an der Optik vorbeischwimmenden Partikel in der Spülflüssigkeit absorbieren beim Durchqueren der Mess-Strecke (18) das Licht der Leuchtdiode. Die Lichtabsorption bewirkt ein kurzzeitiges Einbrechen der Transistorausgangsspannung, wodurch die vorerwähnten Signaleinbrüche oder Signalsprünge (20) des Signals gekennzeichnet sind. Das Mess-Signal (16) wird invertiert, anschließend elektronisch aufbereitet. Nach Digitalisierung in einem Komparator kann es vom Rechner ausgewertet werden. Das invertierte Mess-Signal (16') ist durch die Signalkurve I und das digitalisierte Signal durch die Kurve II in Fig. 3 veranschaulicht. Bei letzterem Signal sind die im Rechner auszuwertenden digitalisierten Signalsprünge mit 20' bezeichnet.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 '.
Claims (7)
dadurch gekennzeichnet, dass zur Optimierung der Spülprozess-Steuerung aus dem Verlauf des Mess-Signals (16, 16') Signaleinbrüche (20, 20') herausgefiltert und zur Erkennung der Schmutzpartikelkonzentration und/oder zur Feststellung der Partikelgrößen der in der Spülflüssigkeit (17) vorhandenen Schmutzpartikel verwendet werden.Method for determining the degree of contamination of the washing liquid in a program-controlled dishwasher equipped with a turbidity sensor, the change in the measurement signals of the sensor, which are more or less noisy in accordance with the contamination of the washing liquid, providing information about the respective degree of contamination of the washing liquid Control of the rinsing process is taken
characterized in that to optimize the washing process control, signal dips (20, 20 ') are filtered out from the course of the measurement signal (16, 16') and to detect the dirt particle concentration and / or to determine the particle sizes of the in the washing liquid (17) existing dirt particles can be used.
dadurch gekennzeichnet, dass das verrauschte Mess-Signal (16) vor der Signalausfilterung, gefiltert, verstärkt, digitalisiert und im Rechner des programmgesteuerten Gerätes ausgewertet wird.Method according to claim 1,
characterized in that the noisy measurement signal (16) is filtered, amplified, digitized and evaluated in the computer of the program-controlled device before the signal is filtered out.
dadurch gekennzeichnet, dass die Signalmuster der digitalisierten Mess-Signale (16, 16') mit in der Geräteelektronik abgespeicherten Signalbildern verglichen werden, welche bestimmten Verschmutzungsarten, Anschmutzungen, Partikeln und dergl. zugeordnet sind, und dass abhängig vom Vergleichsergebnis in den Programmlauf des Gerätes eingegriffen wird.Method according to claims 1 and 2,
characterized in that the signal patterns of the digitized measurement signals (16, 16 ') are compared with signal images stored in the device electronics, which are assigned to certain types of soiling, soiling, particles and the like, and that, depending on the comparison result, intervenes in the program run of the device becomes.
dadurch gekennzeichnet, dass das vom Trübungssensor (15) gelieferte Mess-Signal (16, 16') zur weiteren Auswertung im Rechner zuvor über ein Hochpassfilter, einen Verstärker sowie über eine Invertierstufe geleitet wird.Process according to claims 1 to 3,
characterized in that the measurement signal (16, 16 ') supplied by the turbidity sensor (15) is passed through a high-pass filter, an amplifier and an inverter stage for further evaluation in the computer.
dadurch gekennzeichnet, dass aus der Häufigkeit und der jeweiligen Dauer des Signaleinbruchs (20, 20') im Mess-Signal (16, 16') auf die Anzahl und die Größe der Partikel in der Spülflüssigkeit geschlossen wird. Process according to claims 1 to 4,
characterized in that the number and the size of the particles in the rinsing liquid are inferred from the frequency and the respective duration of the signal dip (20, 20 ') in the measurement signal (16, 16').
dadurch gekennzeichnet, dass die zu verarbeitenden Mess-Signale (16, 16') von einem in einer beruhigten Mess-Strecke (18) angeordneten Trübungssensor (15) erzeugt werden.Method according to one or more of claims 1 to 5,
characterized in that the measurement signals (16, 16 ') to be processed are generated by a turbidity sensor (15) arranged in a calmed measurement section (18).
dadurch gekennzeichnet, dass die beruhigte Mess-Strecke (18) durch einen der Zuleitung (11, 12) zu einem Sprüharm (3, 4, 5) parallelgeschalteten Nebenweg (19) gebildet wird.Method according to claim 6,
characterized in that the calmed measuring section (18) is formed by a side path (19) connected in parallel to the feed line (11, 12) to a spray arm (3, 4, 5).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE10040483 | 2000-08-18 | ||
DE2000140483 DE10040483A1 (en) | 2000-08-18 | 2000-08-18 | Method for determining the degree of contamination of the washing liquid in a program-controlled dishwasher equipped with a turbidity sensor |
Publications (2)
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EP1180344A2 true EP1180344A2 (en) | 2002-02-20 |
EP1180344A3 EP1180344A3 (en) | 2004-05-19 |
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ID=7652917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP01119106A Withdrawn EP1180344A3 (en) | 2000-08-18 | 2001-08-08 | Method to determine the dirt amount of the washing liquid for a programable dishwasher with turbidity sensor |
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DE (1) | DE10040483A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1419727A2 (en) * | 2002-11-14 | 2004-05-19 | Whirlpool Corporation | Device for measuring the turbidity of the rinsing liquid in a dishwasher |
WO2004101878A1 (en) * | 2003-05-16 | 2004-11-25 | Emz-Hanauer Gmbh & Co. Kgaa | Device for a sensor unit for detecting optical properties of a medium |
WO2006031057A1 (en) * | 2004-09-14 | 2006-03-23 | Lg Electronics Inc. | A dishwasher and a method for controlling the same |
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 (en) * | 2009-01-07 | 2010-07-14 | Electrolux Home Products Corporation N.V. | Detection of detergent |
EP2221604A1 (en) * | 2009-02-19 | 2010-08-25 | Electrolux Home Products Corporation N.V. | Turbidity sensor |
WO2011110243A1 (en) * | 2010-03-10 | 2011-09-15 | Henkel Ag & Co. Kgaa | Metering device having an optical sensor |
CN109512359A (en) * | 2018-12-31 | 2019-03-26 | 华帝股份有限公司 | Dish washing machine and detergent feeding control device and method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE10248538A1 (en) * | 2002-10-17 | 2004-04-29 | Aweco Appliance Systems Gmbh & Co. Kg | Water dirtiness measurement method for use with a dishwasher, whereby the heating rate of an electrical heating element is used as an indicator, in conjunction with a computation or look-up function, of water dirtiness |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
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US7246625B2 (en) * | 2000-11-28 | 2007-07-24 | Miele & Cie. Gmbh & Co. | Dishwasher |
EP1419727A2 (en) * | 2002-11-14 | 2004-05-19 | Whirlpool Corporation | Device for measuring the turbidity of the rinsing liquid in a dishwasher |
EP1419727A3 (en) * | 2002-11-14 | 2006-09-06 | Whirlpool Corporation | Device for measuring the turbidity of the rinsing liquid in a dishwasher |
WO2004101878A1 (en) * | 2003-05-16 | 2004-11-25 | Emz-Hanauer Gmbh & Co. Kgaa | Device for a sensor unit for detecting optical properties of a medium |
WO2006031057A1 (en) * | 2004-09-14 | 2006-03-23 | Lg Electronics Inc. | A dishwasher and a method for controlling the same |
US7540293B2 (en) | 2004-09-14 | 2009-06-02 | Lg Electronics Inc. | Dishwasher |
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EP2206457A1 (en) * | 2009-01-07 | 2010-07-14 | Electrolux Home Products Corporation N.V. | Detection of detergent |
EP2221604A1 (en) * | 2009-02-19 | 2010-08-25 | Electrolux Home Products Corporation N.V. | Turbidity sensor |
WO2011110243A1 (en) * | 2010-03-10 | 2011-09-15 | Henkel Ag & Co. Kgaa | Metering device having an optical sensor |
CN109512359A (en) * | 2018-12-31 | 2019-03-26 | 华帝股份有限公司 | Dish washing machine and detergent feeding control device and method thereof |
Also Published As
Publication number | Publication date |
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EP1180344A3 (en) | 2004-05-19 |
DE10040483A1 (en) | 2002-03-07 |
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