EP1967121B1 - Method for causing water to flow into the detergent holder of a dishwasher - Google Patents

Method for causing water to flow into the detergent holder of a dishwasher Download PDF

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Publication number
EP1967121B1
EP1967121B1 EP08002338A EP08002338A EP1967121B1 EP 1967121 B1 EP1967121 B1 EP 1967121B1 EP 08002338 A EP08002338 A EP 08002338A EP 08002338 A EP08002338 A EP 08002338A EP 1967121 B1 EP1967121 B1 EP 1967121B1
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EP
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Prior art keywords
rotational speed
refuelling
circulating pump
pump
speed
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EP08002338A
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German (de)
French (fr)
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EP1967121A1 (en
Inventor
Erik Berends
Markus Drücker
Uwe Femmer
Volkmar Schwert
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Miele und Cie KG
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Miele und Cie KG
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Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Priority to PL08002338T priority Critical patent/PL1967121T3/en
Publication of EP1967121A1 publication Critical patent/EP1967121A1/en
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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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0023—Water filling
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/08—Drain or recirculation pump parameters, e.g. pump rotational speed or current absorbed by the motor
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/01—Water supply, e.g. opening or closure of the water inlet valve

Definitions

  • the invention relates to a method for carrying out a water inlet into the washing container of a dishwasher, in particular a domestic dishwasher with a circulating pump whose speed can be controlled, wherein the method of filling a groundwater quantity and a subsequent increase in the circulation pump speed of a start-up speed includes a target speed.
  • a method for carrying out a water inlet into the washing container of a dishwasher in particular a domestic dishwasher with a circulating pump whose speed can be controlled, wherein the method of filling a groundwater quantity and a subsequent increase in the circulation pump speed of a start-up speed includes a target speed.
  • unstable pump operation is characterized by an increase in the number of revolutions, a decrease in the engine torque, fluctuations in the pump pressure and noise.
  • the Applicant manufactures household dishwashers in which first a quantity of groundwater is introduced. If, as a result of an unstable pump run, a speed fluctuation of the circulating pump motor is detected, then a discrete quantity of 75 ml is refueled. For large Spülgutmengen this leads to the corresponding number of refilling cycles, also more water is usually filled in the rinse tank in the last refueling step, as would be necessary for a stable pump running.
  • the invention thus presents the problem of disclosing a method for carrying out a water inlet in the washing container of a dishwasher of the type mentioned, in which a very precise amount of water is simply and quickly determined.
  • the water intake becomes more accurate and faster.
  • the short dwell time in the unstable pump run (about one second) significantly reduces noise.
  • Dishwasher 1 shown has a designated 2 rinse tank, which opens into a collecting pot 3 in the lower area. From there, the accumulated liquid, usually cold or heated water with rinsing additives, via a suction nozzle 4 of a circulating pump 5 is supplied.
  • the washing container 2 two baskets 6 and 7 and a cutlery drawer 8 are arranged, which serve to hold the corresponding items to be washed.
  • the cutlery and crockery items not shown in the drawings are rotatable spray arms 9 to 11, of which two baskets 6 and 7 and the drawer 8 is assigned one each, irrigated with cleaning liquid.
  • the circulation pump 5 has three separate discharge nozzles 12 to 14, which are connected via Sprüharmzutechnisch 15 to 17 with the respective spray arm 9, 10 or 11 in combination.
  • the lower basket 6 associated spray arm 9 is supplied via the discharge nozzle 12 and the upper basket spray arm 10 via the discharge nozzle 13 with rinsing or cleaning liquid.
  • the upper installed on the Spipporaumdecke 2.1 spray arm 11 of the discharge nozzle 14 leads to liquid.
  • the spray arms can be operated together or alternately. To enable the latter, a water switch, not shown in the drawing would have to be integrated for example in the pump chamber of the circulation pump.
  • the drive of the pump impeller (not shown), through which the necessary pressure for supplying the spray arms is constructed 9 to 11, is carried out by a motor 18 with a variable speed.
  • a motor 18 with a variable speed In the embodiment, reference will later be made to an electronically commutated motor with permanent magnet rotor, other motor types with variable speed but are also conceivable.
  • the speed control takes place in the symbolized by the box 19 and the control line 20 electronic device control.
  • the speed is calculated by a speed estimator from motor parameters, voltages and measured motor currents.
  • the controller manipulated variable corresponds to a nominal value of the engine torque, from which the engine voltages are determined via a motor model.
  • the device control 19 also influences the water supply to the washing container 2 by setting the duty cycle of a solenoid valve 21 and determines the run-in amount of water via an impeller 22.
  • the water supply is shown in the figure only symbolized by the two aforementioned components solenoid valve 21 and impeller 22, which is common in dishwashers water supply via a water bag and a softening device is not included, because it is irrelevant to the invention.
  • FIG. 2 To explain the phenomenon of a stable and unstable pump run, is in FIG. 2 the behavior of some of the liquid level in the washing container 2 dependent parameters shown. Predetermined is a specific amount of liquid V 1 , which is located in the washing compartment 2. Now, if the speed of the circulation pump 5 is slowly increased, as shown in the diagram I, a part of the liquid in the Sprüharmzutechnischen 15 to 17 and the spray arms 9 to 11 transported, a part runs over the dishes. The volume in the collection pot 3 is reduced by these proportions. The higher the speed of the circulating pump 5, the more liquid is in circulation and the lower the volume in the collecting pot 3.
  • the liquid level drops to the height of the intake 4, the pump 5 sucks air , This increases due to the lower resistance of the air at the pump impeller abruptly the speed.
  • the characteristic value for monitoring the pump run is calculated from the controller manipulated variable by summing the amounts of the deviations from the average manipulated variable over a time interval of, for example, one second.
  • Another indication of unstable pump operation is the pressure fluctuation of the pump pressure due to the admixture of air (see diagram III).
  • the method according to the invention for carrying out a water inlet is illustrated by means of a time-dependent diagram, which represents the circulating pump speed and the amount of water flowed in by means of the impeller counter 22.
  • the device controller opens the solenoid valve 21 until a quantity of groundwater has entered the washing container 2.
  • the groundwater quantity corresponds to the quantity which a device that is only slightly or not loaded needs for stable pumping with target speed.
  • the circulating pump 5 is switched on by the device control 19 and, starting from a starting speed, the speed is increased with an increase of approximately 20 min -1 / s. The starting speed is selected so that stable pumping is ensured even at maximum load.
  • an unstable pump run will then occur when the baskets 6 to 8 are loaded, which is recognized by the device control 19 in that the characteristic value calculated from the controller control variable of the circulating pump motor 18 fluctuates more than a predetermined deviation measure.
  • the speed at which the unstable pump running occurs is stored as a refueling speed and used to calculate a Nachzutankenden amount of water.
  • the dependency between the refueling speed and the amount of water to be replenished is device-specific and can be determined by tests. In this case, suitable statistical methods can be used in order to be able to count on a linear dependence of the two variables.
  • the circulation pump 5 is operated after completion of the start-up and Nachankphase with a constant target speed, a calculation of the amount of water is sufficient depending on the Nachank speed;
  • variable target speeds that is to say those dependent on the selected program or on the program section to be executed, the difference or the quotient between the target speed and the refueling speed is included in the calculation of the water quantity.
  • the circulation pump speed is reduced by 200 min -1 compared to the refueling speed in order to achieve stable pumping again, refueling is then carried out at constant speed (section C).
  • the recycle pump speed is further increased, ideally up to the target speed because a single refueling operation has been sufficient.
  • an unstable pump run occurs again at a second refueling speed. This can be due to large sinks be in the fluid circuit, for example, caused by incorrectly set vessels or more Spülgutmaschine with a rough surface.
  • a second amount of water to be replenished is then calculated, there is a further refueling process in section E.
  • the target speed is then reached in section F.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)

Abstract

The method involves filling a ground water amount and increasing a rotational speed of a circulating pump (5) from a starting rotational speed to a target rotational speed. The rotational speed of the circulating pump is increased to a refueling rotational speed based on the starting rotational speed after the intake of the ground water amount such that an unstable pump run occurs. The water amount is supplied to a rinsing machine i.e. dishwasher (1), depending on the refueling rotational speed or a mathematical relationship between the target rotational speed and refueling rotational speed.

Description

Die Erfindung betrifft ein Verfahren zur Durchführung eines Wassereinlaufs in den Spülbehälter einer Spülmaschine, insbesondere einer Haushalts-Geschirrspülmaschine mit einer Umwälzpumpe, deren Drehzahl regelbar ist, wobei das Verfahren das Einfüllen einer Grundwassermenge und eine anschließende Erhöhung der Umwälzpumpen-Drehzahl von einer Start-Drehzahl zu einer Ziel-Drehzahl umfasst. Ein derartiges Verfahren wird inbesondere in der DE-A-1 951 335 Z offenbartThe invention relates to a method for carrying out a water inlet into the washing container of a dishwasher, in particular a domestic dishwasher with a circulating pump whose speed can be controlled, wherein the method of filling a groundwater quantity and a subsequent increase in the circulation pump speed of a start-up speed includes a target speed. Such a method is described in particular in DE-A-1 951 335 Z discloses

Beim Betrieb von Haushalts-Geschirrspülmaschinen besteht der Wunsch nach einem möglichst geringen Wasserverbrauch. Aus diesem Grund wird die Maschine in den wasserführenden Programmabschnitten mit einer Wassermenge betrieben, welche gerade noch einen stabilen Betrieb der Umwälzpumpe ermöglicht und nicht aufgrund eines zu niedrigen Wasserstandes im Sammeltopf Schlürfgeräusche verursacht. Da diese Wassermenge nicht konstant ist, sondern von der Spülgutmenge und ihren Benetzungseigenschaften abhängt, müssen Vorkehrungen getroffen werden, sie möglichst genau zu bestimmen. Ein instabiler Betrieb der Umwälzpumpe, im Folgenden instabiler Pumpenlauf genannt, ist durch eine Erhöhung der Drehzahl, ein Absinken des Motor-Drehmoments, Schwankungen des Pumpendrucks und Geräuschentwicklung gekennzeichnet.When operating household dishwashers, there is a desire for the lowest possible water consumption. For this reason, the machine is operated in the water-bearing program sections with a quantity of water, which just allows a stable operation of the circulation pump and not caused by a too low water level in the collecting pot Schlürfgeräusche. Since this amount of water is not constant, but depends on the Spülgutmenge and their wetting properties, precautions must be taken to determine them as accurately as possible. An unstable operation of the circulation pump, hereinafter referred to as unstable pump operation, is characterized by an increase in the number of revolutions, a decrease in the engine torque, fluctuations in the pump pressure and noise.

Aus der EP 0 326 893 A2 ist es bekannt, den Wassereinlauf bei eingeschalteter und mit Ziel-Drehzahl laufender Umwälzpumpe vorzunehmen. Es wird dann so lange Wasser eingefüllt, bis Mittel zum Messen von Motorparametern, Druck oder Geräuschen einen stabilen Pumpenlauf anzeigen. Dies führt zu Beginn des Wassereinlaufs zu einer relativ langen instabilen Betriebsphase mit entsprechender Geräuschentwicklung. Die Auswertung von Geräuschen zur Wassereinlaufsteuerung ist auch aus der DE 198 28 871 A1 und aus der DE 100 65 677 A1 bekannt.From the EP 0 326 893 A2 It is known to make the water inlet at the switched and running at target speed circulation pump. It is then filled with water until means for measuring engine parameters, pressure or noise indicate stable pumping. This leads to the beginning of the water inlet to a relatively long unstable operating phase with corresponding noise. The evaluation of noise for water intake control is also from the DE 198 28 871 A1 and from the DE 100 65 677 A1 known.

In der EP 0 727 179 B1 wird ein Verfahren vorgeschlagen, bei dem in einem ersten wasserführenden Programmabschnitt zunächst eine Grundmenge in den Spülbehälter eingefüllt und dann bei instabilem Pumpenlauf nachgetankt wird. Auch hier entstehen bis zum Erreichen des stabilen Pumpenlaufs Schlürfgeräusche.In the EP 0 727 179 B1 a method is proposed in which in a first water-bearing program section initially a basic amount is filled into the washing and then refueled in unstable pump running. Here, too, arise until the achievement of stable pump running Schlürfgeräusche.

Von der Anmelderin werden Haushalts-Geschirrspülmaschinen hergestellt, bei denen zunächst eine Grundwassermenge eingefüllt wird. Wird infolge eines instabilen Pumpenlaufs eine Drehzahlschwankung des Umwälzpumpen-Motors erkannt, so wird eine diskrete Menge von 75 ml nachgetankt. Bei großen Spülgutmengen führt dies zu der entsprechenden Anzahl von Nachtankzyklen, außerdem wird im letzten Nachtankschritt in der Regel mehr Wasser in den Spülbehälter eingefüllt, als für einen stabilen Pumpenlauf notwendig wären.The Applicant manufactures household dishwashers in which first a quantity of groundwater is introduced. If, as a result of an unstable pump run, a speed fluctuation of the circulating pump motor is detected, then a discrete quantity of 75 ml is refueled. For large Spülgutmengen this leads to the corresponding number of refilling cycles, also more water is usually filled in the rinse tank in the last refueling step, as would be necessary for a stable pump running.

Mit der Einführung drehzahlgeregelter Umwälzpumpen ist eine schnellere Reaktion auf zu geringe Wasserstände möglich. So ist es aus der EP 1 031 314 B1 bekannt, die Drehzahl der Umwälzpumpe entsprechend der ansteigenden Wassermenge auf Volllastbetrieb zu regeln. Dabei wird die Pumpe während des Füllvorgangs immer mit einer Drehzahl betrieben, die gerade noch einem stabilen Pumpenlauf entspricht. Aufgrund des relativ schnellen Wassereinlaufs bei herkömmlichen Geschirrspülmaschinen würde eine extrem schnelle Regelung benötigt, dies verursacht einen großen Rechneraufwand mit hohen Produktionskosten. Alternativ könnte die Zulaufmenge gedrosselt werden, was aber dann zu sehr langen Wassereinlaufzeiten führen würde. Außerdem würde eine Instabilität, beispielsweise eine in der Pumpenkammer vorhandene Luftblase oder eine kurzzeitige Unterbrechung der Wasserzufuhr nur schwer auszuregeln sein.With the introduction of variable speed circulation pumps, a faster response to low water levels is possible. So it is from the EP 1 031 314 B1 known to regulate the speed of the circulating pump according to the increasing amount of water to full load operation. During the filling process, the pump is always operated at a speed that just corresponds to a stable pump run. Due to the relatively fast water intake in conventional dishwashers an extremely fast control would be required, this causes a large computer cost with high production costs. Alternatively, the feed rate could be throttled, but this would then lead to very long water run-in times. In addition, instability, for example, an existing air bubble in the pump chamber or a brief interruption of the water supply would be difficult to correct.

Der Erfindung stellt sich somit das Problem, ein Verfahren zur Durchführung eines Wassereinlaufs in den Spülbehälters einer Spülmaschine der eingangs genannten Art zu offenbaren, bei dem einfach und schnell eine möglichst exakte Wassermenge ermittelt wird.The invention thus presents the problem of disclosing a method for carrying out a water inlet in the washing container of a dishwasher of the type mentioned, in which a very precise amount of water is simply and quickly determined.

Erfindungsgemäß wird dieses Problem durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.According to the invention, this problem is solved by a method having the features of patent claim 1. Advantageous embodiments and further developments of the invention will become apparent from the following subclaims.

Durch die Berechnung der fehlenden Wassermenge wird der Wassereinlauf genauer und schneller. Außerdem wird durch die kurze Verweildauer im instabilen Pumpenlauf (ca. eine Sekunde) die Geräuschbildung deutlich reduziert.By calculating the missing amount of water, the water intake becomes more accurate and faster. In addition, the short dwell time in the unstable pump run (about one second) significantly reduces noise.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigt

Figur 1
eine Geschirrspülmaschine;
Figur 2
das Verhalten der Umwälzpumpen-Drehzahl, der Stellgröße der Motorregelung und des Pumpendrucks in einem Zeitdiagramm;
Figur 3
die Umwälzpumpen-Drehzahl und die eingelaufene Wassermenge in einem Zeitdiagramm.
An embodiment of the invention is shown purely schematically in the drawings and will be described in more detail below. It shows
FIG. 1
a dishwasher;
FIG. 2
the behavior of the circulating pump speed, the control value of the motor control and the pump pressure in a time diagram;
FIG. 3
the circulating pump speed and the amount of water flowed in a time diagram.

Die in Figur 1 dargestellte Geschirrspülmaschine 1 besitzt einen mit 2 bezeichneten Spülbehälter, der im unteren Bereich in einen Sammeltopf 3 mündet. Von dort wird die angesammelte Flüssigkeit, in der Regel kaltes oder erwärmtes Wasser mit Spülzusätzen, über einen Ansaugstutzen 4 einer Umwälzpumpe 5 zugeführt. In dem Spülbehälter 2 sind zwei Geschirrkörbe 6 und 7 und eine Besteckschublade 8 angeordnet, welche zur Halterung des entsprechenden Spülguts dienen. Die in den Zeichnungen nicht dargestellten Besteck- und Geschirrteile werden durch drehbare Sprüharme 9 bis 11, von denen beiden Körben 6 und 7 und der Schublade 8 je einer zugeordnet ist, mit Reinigungsflüssigkeit beregnet. Hierzu besitzt die Umwälzpumpe 5 drei separate Druckstutzen 12 bis 14, die über Sprüharmzuleitungen 15 bis 17 mit dem jeweiligen Sprüharm 9, 10 oder 11 in Verbindung stehen. So wird der dem Unterkorb 6 zugeordnete Sprüharm 9 über den Druckstutzen 12 und der Oberkorb-Sprüharm 10 über den Druckstutzen 13 mit Spül- oder Reinigungsflüssigkeit versorgt. Dem oberen an der Spülraumdecke 2.1 installierten Sprüharm 11 führt der Druckstutzen 14 Flüssigkeit zu. Die Sprüharme können gemeinsam oder wechselweise betrieben werden. Um letzteres zu ermöglichen, müsste eine in der Zeichnung nicht dargestellte Wasserweiche beispielsweise in der Pumpenkammer der Umwälzpumpe integriert sein.In the FIG. 1 Dishwasher 1 shown has a designated 2 rinse tank, which opens into a collecting pot 3 in the lower area. From there, the accumulated liquid, usually cold or heated water with rinsing additives, via a suction nozzle 4 of a circulating pump 5 is supplied. In the washing container 2, two baskets 6 and 7 and a cutlery drawer 8 are arranged, which serve to hold the corresponding items to be washed. The cutlery and crockery items not shown in the drawings are rotatable spray arms 9 to 11, of which two baskets 6 and 7 and the drawer 8 is assigned one each, irrigated with cleaning liquid. For this purpose, the circulation pump 5 has three separate discharge nozzles 12 to 14, which are connected via Sprüharmzuleitungen 15 to 17 with the respective spray arm 9, 10 or 11 in combination. Thus, the lower basket 6 associated spray arm 9 is supplied via the discharge nozzle 12 and the upper basket spray arm 10 via the discharge nozzle 13 with rinsing or cleaning liquid. The upper installed on the Spülraumdecke 2.1 spray arm 11 of the discharge nozzle 14 leads to liquid. The spray arms can be operated together or alternately. To enable the latter, a water switch, not shown in the drawing would have to be integrated for example in the pump chamber of the circulation pump.

Der Antrieb des Pumpenlaufrads (nicht dargestellt), durch welches der notwendige Druck zur Versorgung der Sprüharme 9 bis 11 aufgebaut wird, erfolgt durch einen Motor 18 mit einer regelbaren Drehzahl. Im Ausführungsbeispiel wird später Bezug genommen auf einen elektronisch kommutierten Motor mit Permanentmagnet-Rotor, andere Motorformen mit regelbarer Drehzahl sind aber auch denkbar. Die Drehzahlregelung erfolgt in der durch den Kasten 19 und die Steuerleitung 20 symbolisierten elektronischen Gerätesteuerung. Für die verwendete feldorientierte Regelung wird die Drehzahl durch einen Drehzahlschätzer aus Motorparametern, Spannungen und gemessenen Motorströmen berechnet. Die Reglerstellgröße entspricht einem Sollwert des Motormoments, aus dem über ein Motormodell die Motorspannungen bestimmt werden.The drive of the pump impeller (not shown), through which the necessary pressure for supplying the spray arms is constructed 9 to 11, is carried out by a motor 18 with a variable speed. In the embodiment, reference will later be made to an electronically commutated motor with permanent magnet rotor, other motor types with variable speed but are also conceivable. The speed control takes place in the symbolized by the box 19 and the control line 20 electronic device control. For the field-oriented control used, the speed is calculated by a speed estimator from motor parameters, voltages and measured motor currents. The controller manipulated variable corresponds to a nominal value of the engine torque, from which the engine voltages are determined via a motor model.

Die Gerätesteuerung 19 beeinflusst auch den Wasserzulauf zum Spülbehälter 2, indem sie die Einschaltdauer eines Magnetventils 21 vorgibt und über einen Flügelradzähler 22 die eingelaufene Wassermenge ermittelt. Der Wasserzulauf ist in der Figur nur symbolisiert durch die beiden vorgenannten Bauteile Magnetventil 21 und Flügelradzähler 22 dargestellt, die bei Geschirrspülern übliche Wasserführung über eine Wassertasche und eine Enthärtungseinrichtung ist nicht enthalten, weil sie für die Erfindung ohne Bedeutung ist.The device control 19 also influences the water supply to the washing container 2 by setting the duty cycle of a solenoid valve 21 and determines the run-in amount of water via an impeller 22. The water supply is shown in the figure only symbolized by the two aforementioned components solenoid valve 21 and impeller 22, which is common in dishwashers water supply via a water bag and a softening device is not included, because it is irrelevant to the invention.

Um das Phänomen eines stabilen und instabilen Pumpenlaufs zu erklären, ist in Figur 2 das Verhalten einiger vom Flüssigkeitsniveau im Spülbehälter 2 abhängiger Parameter dargestellt. Vorgegeben sei eine konkrete Flüssigkeitsmenge V1, welche sich im Spülbehälter 2 befindet. Wird nun langsam die Drehzahl der Umwälzpumpe 5 erhöht, wie im Diagramm I dargestellt, wird ein Teil der Flüssigkeit in die Sprüharmzuleitungen 15 bis 17 und die Sprüharme 9 bis 11 befördert, ein Teil läuft über das Geschirr. Das Volumen im Sammeltopf 3 wird um diese Anteile verringert. Je höher die Drehzahl der Umwälzpumpe 5 ist, um so mehr Flüssigkeit befindet sich im Kreislauf und um so geringer wird das Volumen im Sammeltopf 3. Bei der Drehzahl n1 sinkt der Flüssigkeitsstand bis auf die Höhe des Ansaugstutzens 4, die Pumpe 5 saugt Luft an. Hierdurch erhöht sich aufgrund des geringeren Widerstands der Luft am Pumpenlaufrad schlagartig die Drehzahl. Erkennbar ist dies wegen der Regelung nicht oder nur schwach am Drehzahlsignal, aber um so deutlicher an der einem aus der Reglerstellgröße des Motors 18 (siehe Diagramm II) berechneten Kennwert, da diese stark geändert werden muss, um die gewünschte Drehzahl auszuregeln. Der Kennwert zur Überwachung des Pumpenlaufs wird aus der Reglerstellgröße durch Summation der Beträge der Abweichungen zur mittleren Stellgröße über ein Zeitintervall von beispielsweise einer Sekunde berechnet. Ein weiteres Indiz für den instabilen Pumpenlauf sind Druckschwankungen des Pumpendrucks wegen der Luftbeimischung (siehe Diagramm III). Diese Erkenntnisse macht sich die Erfindung zunutze.To explain the phenomenon of a stable and unstable pump run, is in FIG. 2 the behavior of some of the liquid level in the washing container 2 dependent parameters shown. Predetermined is a specific amount of liquid V 1 , which is located in the washing compartment 2. Now, if the speed of the circulation pump 5 is slowly increased, as shown in the diagram I, a part of the liquid in the Sprüharmzuleitungen 15 to 17 and the spray arms 9 to 11 transported, a part runs over the dishes. The volume in the collection pot 3 is reduced by these proportions. The higher the speed of the circulating pump 5, the more liquid is in circulation and the lower the volume in the collecting pot 3. At the speed n 1 , the liquid level drops to the height of the intake 4, the pump 5 sucks air , This increases due to the lower resistance of the air at the pump impeller abruptly the speed. This is recognizable because of the regulation is not or only weak on Speed signal, but the more so at the one of the controller control variable of the motor 18 (see diagram II) calculated characteristic value, since this must be changed greatly in order to adjust the desired speed. The characteristic value for monitoring the pump run is calculated from the controller manipulated variable by summing the amounts of the deviations from the average manipulated variable over a time interval of, for example, one second. Another indication of unstable pump operation is the pressure fluctuation of the pump pressure due to the admixture of air (see diagram III). These findings make use of the invention.

Im Folgenden ist das erfindungsgemäße Verfahren zur Durchführung eines Wassereinlaufs anhand eines zeitabhängigen Diagramms dargestellt, welches die Umwälzpumpen-Drehzahl und die mittels des Flügelradzählers 22 gemessene eingelaufene Wassermenge darstellt. In einem ersten Abschnitt A öffnet die Gerätesteuerung das Magnetventil 21, bis eine Grundwassermenge in den Spülbehälter 2 eingelaufen ist. Die Grundwassermenge entspricht der Menge, welche ein nur geringfügig oder gar nicht beladenes Gerät für einen stabilen Pumpenlauf mit Ziel-Drehzahl benötigt. Im nächsten Abschnitt B wird die Umwälzpumpe 5 von der Gerätesteuerung 19 eingeschaltet und ausgehend von einer Start-Drehzahl die Drehzahl mit einem Anstieg von ca. 20 min-1/s erhöht. Die Start-Drehzahl ist so gewählt, dass auch bei Maximalbeladung ein stabiler Pumpenlauf gewährleistet ist. Mit steigender Drehzahl wird sich dann bei beladenen Körben 6 bis 8 ein instabiler Pumpenlauf einstellen, der von der Gerätesteuerung 19 dadurch erkannt wird, dass der aus der Reglerstellgröße des Umwälzpumpen-Motors 18 berechnete Kennwert stärker als ein vorbestimmtes Abweichungsmaß schwankt. Die Drehzahl, bei der der instabile Pumpenlauf auftritt, wird als Nachtank-Drehzahl abgespeichert und zur Berechnung einer nachzutankenden Wassermenge herangezogen. Die Abhängigkeit zwischen Nachtank-Drehzahl und nachzutankender Wassermenge ist gerätespezifisch und kann durch Versuche ermittelt werden. Dabei können geeignete statistische Verfahren eingesetzt werden, um mit einer linearen Abhängigkeit der beiden Größen rechnen zu können. Soll die Umwälzpumpe 5 nach Beendigung der Anlauf- und Nachtankphase mit einer konstanten Ziel-Drehzahl betrieben werden, reicht eine Berechnung der Wassermenge in Abhängigkeit von der Nachtank-Drehzahl aus; bei variablen, d. h. vom gewählten Programm oder vom durchzuführenden Programmabschnitt abhängigen Ziel-Drehzahlen geht in die Berechnung der Wassermenge die Differenz oder der Quotient zwischen der Ziel-Drehzahl und der Nachtank-Drehzahl ein.In the following, the method according to the invention for carrying out a water inlet is illustrated by means of a time-dependent diagram, which represents the circulating pump speed and the amount of water flowed in by means of the impeller counter 22. In a first section A, the device controller opens the solenoid valve 21 until a quantity of groundwater has entered the washing container 2. The groundwater quantity corresponds to the quantity which a device that is only slightly or not loaded needs for stable pumping with target speed. In the next section B, the circulating pump 5 is switched on by the device control 19 and, starting from a starting speed, the speed is increased with an increase of approximately 20 min -1 / s. The starting speed is selected so that stable pumping is ensured even at maximum load. As the speed increases, an unstable pump run will then occur when the baskets 6 to 8 are loaded, which is recognized by the device control 19 in that the characteristic value calculated from the controller control variable of the circulating pump motor 18 fluctuates more than a predetermined deviation measure. The speed at which the unstable pump running occurs is stored as a refueling speed and used to calculate a Nachzutankenden amount of water. The dependency between the refueling speed and the amount of water to be replenished is device-specific and can be determined by tests. In this case, suitable statistical methods can be used in order to be able to count on a linear dependence of the two variables. If the circulation pump 5 is operated after completion of the start-up and Nachankphase with a constant target speed, a calculation of the amount of water is sufficient depending on the Nachank speed; In the case of variable target speeds, that is to say those dependent on the selected program or on the program section to be executed, the difference or the quotient between the target speed and the refueling speed is included in the calculation of the water quantity.

Vor dem Nachtanken wird die Umwälzpumpen-Drehzahl gegenüber der Nachtank-Drehzahl um 200 min-1 verringert, um wieder einen stabilen Pumpenlauf zu erreichen, das Nachtanken erfolgt dann bei konstanter Drehzahl (Abschnitt C). Nach Beendigung des Nachtank-Vorgangs wird die Umwälzpumpen-Drehzahl weiter erhöht, im Idealfall bis zur Ziel-Drehzahl, weil ein einziger Nachtank-Vorgang ausgereicht hat. Im dargestellten Diagramm stellt sich bei einer zweiten Nachtank-Drehzahl erneut ein instabiler Pumpenlauf ein. Grund hierfür können große Senken im Flüssigkeitskreislauf sein, beispielsweise hervorgerufen durch falsch eingestellte Gefäße oder mehrere Spülgutteile mit einer rauen Oberfläche. Auf Basis der zweiten Nachtank-Drehzahl wird dann eine zweite nachzutankende Wassermenge berechnet, es kommt zu einem weiteren Nachtank-Vorgang in Abschnitt E. Die Ziel-Drehzahl wird dann im Abschnitt F erreicht.Before refueling, the circulation pump speed is reduced by 200 min -1 compared to the refueling speed in order to achieve stable pumping again, refueling is then carried out at constant speed (section C). Upon completion of the refueling process, the recycle pump speed is further increased, ideally up to the target speed because a single refueling operation has been sufficient. In the diagram shown, an unstable pump run occurs again at a second refueling speed. This can be due to large sinks be in the fluid circuit, for example, caused by incorrectly set vessels or more Spülgutteile with a rough surface. On the basis of the second refueling speed, a second amount of water to be replenished is then calculated, there is a further refueling process in section E. The target speed is then reached in section F.

Claims (9)

  1. Method for letting water flow into the washing container (2) of a dishwasher (1), in particular of a household dishwasher comprising a circulating pump (5), the rotational speed of which can be controlled, the method comprising the steps of filling an amount of groundwater and then increasing the rotational speed of the circulating pump from a starting rotational speed to a target rotational speed,
    characterised in that
    after the amount of groundwater has flowed in, the rotational speed of the circulating pump is increased from a starting rotational speed to a refuelling rotational speed at which unstable pump operation occurs, and in that an amount of water, which is dependent on the refuelling rotational speed or the difference or the quotient between the target rotational speed and the refuelling rotational speed, is then fed to the washing container (2).
  2. Method according to claim 1,
    characterised in that
    the unstable pump operation is detected by a control parameter of the circulating pump motor (18) or a characteristic value calculated therefrom being exceeded by a predetermined deviation amount.
  3. Method according to claim 2,
    characterised in that
    the correcting variable of the circulating pump motor (18) or a characteristic variable calculated therefrom is monitored as a control parameter.
  4. Method according to any one of the preceding claims,
    characterised in that,
    after the first refuelling process, further monitoring of the unstable pump operation is carried out, with optional detection of a second refuelling rotational speed and a second refuelling process associated therewith.
  5. Method according to any one of the preceding claims,
    characterised in that
    the starting rotational speed is less than a rotational speed at which unstable pump operation occurs in the case of maximum loading.
  6. Method according to any one of the preceding claims,
    characterised in that
    the rotational speed is increased continuously.
  7. Method according to claim 6,
    characterised in that
    the rotational speed is increased by approx. 20 min-1/s.
  8. Method according to any one of the preceding claims,
    characterised in that
    the rotational speed of the circulating pump is kept constant during the refuelling process.
  9. Method according to claim 8,
    characterised in that,
    during the refuelling process, the rotational speed of the circulating pump is reduced compared to the refuelling rotational speed.
EP08002338A 2007-03-06 2008-02-08 Method for causing water to flow into the detergent holder of a dishwasher Active EP1967121B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08002338T PL1967121T3 (en) 2007-03-06 2008-02-08 Method for causing water to flow into the detergent holder of a dishwasher

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007011307A DE102007011307B3 (en) 2007-03-06 2007-03-06 Water intake implementing method for rinsing machine i.e. household-dishwasher, involves supplying water amount to machine depending on refueling rotational speed or mathematical relationship between target and refueling rotational speeds

Publications (2)

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EP1967121A1 EP1967121A1 (en) 2008-09-10
EP1967121B1 true EP1967121B1 (en) 2011-07-06

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AT (1) ATE515227T1 (en)
DE (1) DE102007011307B3 (en)
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Publication number Priority date Publication date Assignee Title
DE102007056918B3 (en) * 2007-11-27 2009-04-30 BSH Bosch und Siemens Hausgeräte GmbH Method for controlling a wash cycle in a water-conducting household appliance
DE102008055022A1 (en) 2008-12-19 2010-06-24 BSH Bosch und Siemens Hausgeräte GmbH A method for pumping a liquid from a water-conducting household appliance
DE102009046359A1 (en) * 2009-11-03 2011-05-05 BSH Bosch und Siemens Hausgeräte GmbH Dishwasher with an optimized filling sequence
DE102010029730A1 (en) * 2010-06-07 2011-12-08 BSH Bosch und Siemens Hausgeräte GmbH Dishwasher with a dynamic filling sequence
DE102010043328A1 (en) * 2010-11-03 2012-05-03 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a water-conducting household appliance
DE102012105906A1 (en) 2012-07-03 2014-01-09 Miele & Cie. Kg Dishwasher and method for operating a dishwasher
DE102014105527B3 (en) * 2014-04-17 2015-04-16 Miele & Cie. Kg Method for controlling a flooding pump system
US10939795B2 (en) 2015-11-19 2021-03-09 Electrolux Appliances Aktiebolag Estimating water fill rate in an appliance for washing and rinsing goods
KR102448862B1 (en) * 2016-01-05 2022-09-30 엘지전자 주식회사 Dish washer and controlling method thereof

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Publication number Priority date Publication date Assignee Title
DE3803006A1 (en) * 1988-02-02 1989-08-03 Hanning Elektro Werke DISHWASHER
DE19505552A1 (en) * 1995-02-18 1996-08-22 Aeg Hausgeraete Gmbh Method for operating a dishwasher
DE19513352C2 (en) * 1995-04-08 1998-01-08 Miele & Cie Method for setting the speed of the circulation pump of a program-controlled dishwasher
DE19750266A1 (en) * 1997-11-13 1999-05-20 Miele & Cie Operating method
DE19828871B4 (en) * 1998-06-25 2008-07-03 BSH Bosch und Siemens Hausgeräte GmbH dishwasher
DE19907076A1 (en) * 1999-02-19 2000-08-24 Bsh Bosch Siemens Hausgeraete Water-bearing household appliance, in particular household dishwasher
DE10065639A1 (en) * 2000-12-29 2002-07-04 Bsh Bosch Siemens Hausgeraete Control method for controlling the electric drive motor of a pump at different speeds
DE10065677A1 (en) * 2000-12-29 2002-07-04 Bsh Bosch Siemens Hausgeraete Water bearing domestic machine has vibration sensor, circuit with amplifier, rectifier, evaluation element and analog-digital converter providing digital signal for controlling pump
US7776159B2 (en) * 2005-12-30 2010-08-17 General Electric Company Methods and apparatus for controlling a dishwasher

Also Published As

Publication number Publication date
ATE515227T1 (en) 2011-07-15
EP1967121A1 (en) 2008-09-10
PL1967121T3 (en) 2011-12-30
ES2367668T3 (en) 2011-11-07
DE102007011307B3 (en) 2008-08-21

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