EP1447469A2 - Method for determining the load in the drum of a laundry treatment machine - Google Patents

Method for determining the load in the drum of a laundry treatment machine Download PDF

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Publication number
EP1447469A2
EP1447469A2 EP04002620A EP04002620A EP1447469A2 EP 1447469 A2 EP1447469 A2 EP 1447469A2 EP 04002620 A EP04002620 A EP 04002620A EP 04002620 A EP04002620 A EP 04002620A EP 1447469 A2 EP1447469 A2 EP 1447469A2
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Prior art keywords
drum
speed
constant
acceleration
laundry
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Granted
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EP04002620A
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German (de)
French (fr)
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EP1447469A3 (en
EP1447469B1 (en
Inventor
Martin Weinmann
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Diehl AKO Stiftung and Co KG
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Diehl AKO Stiftung and Co KG
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D06F2103/48—Current or voltage of the motor driving the pump

Definitions

  • the invention relates to a method according to the preamble of the claim.
  • the present invention is technical Problem based, in order to better optimize the spin speed by detecting the electrical power consumption of the drive motor for the drum rotation a more precise statement about the current load to achieve the laundry drum.
  • the power measurements during the two different constant speeds and the duration of the final acceleration phase to be measured are advantageously carried out in a manner known per se by means of voltage and Current measurement on the DC link for a controllable frequency or voltage converter for influencing the speed of a synchronous or asynchronous working three-phase AC motor or a DC universal motor than the drum drive.
  • That proportionality factor for the current drum loading and therefore also for the maximum permissible drum speed is determined during the Operation of the machine driving the laundry drum when reaching a first Speed n1 temporarily held constant (phase I in the speed-time diagram the drawing).
  • the electrical drive power consumed in the meantime P1 is due to the design, in particular the mechanical friction proportional to the drum bearing.
  • the electric drum drive is initially set to a phase I lower speed n2 of the laundry drum braked or let it run out, which in turn is then kept constant during the current measurement phase II again, now for this lower speed n2, via the electrical power consumption P2 of the drive motor for the drum whose design is now determined To determine the power requirement.
  • the potential is Energy at the higher speed n1 (as a product of the moment of inertia and angular velocity) proportional to the sum of the potential Energy at the lower speed n2 and the energy consumption Eb during acceleration phase III minus the design-related friction energy during the acceleration phase, i.e. the product of the mean of the both measured friction powers P1, P2 and the duration tb of the acceleration phase III.
  • Phase III since in this proportionality factor apart from the determination of the duration Phase III only receive electrical power measurements that are in the DC intermediate circuit as current and voltage measurements easily and accurately are feasible, the procedure according to the invention results in a reproducible Characteristic value for the current drum load and thus dependent on the design Machine data for an optimized speed limit when accelerating the laundry drum to the highest possible spin speed.

Abstract

The method determines the mass inertia moment of the loaded laundry drum from the measured electrical power requirements (P1,P2) of the electric drive motor for rotation of the laundry drum at 2 different constant rev values (n1,n2) and during an acceleration phase for increasing the revs from the lower constant revs to the higher constant revs, the measured power requirements inserted in a defined equation.

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Patentanspruches.The invention relates to a method according to the preamble of the claim.

Ein derartiges Verfahren ist aus der eigenen DE 44 31 846 C2 bekannt. Darin ist ausgeführt, dass einerseits für bestimmte Waschgänge und insbesondere für das Trockenschleudern der in der Trommel einer Waschmaschine oder eine Wäscheschleuder enthaltenen Wäsche ein möglichst hochtouriger elektromotorischer Antrieb wünschenswert ist, während andererseits die dann auf die mechanischen Komponenten der Maschine einwirkenden Kräfte, insbesondere unwuchtbedingt schwankende Zentrifugalkräfte, Schäden an der Maschine wie insbesondere an der Aufhängung und Lagerung der Trommel hervorrufen können. Deshalb ist es wünschenswert, die aktuelle Beladungssituation zu kennen, um den elektromotorischen Antrieb der Trommel auf eine darauf abgestimmt optimal hohe Trommeldrehzahl begrenzen zu können.Such a method is known from DE 44 31 846 C2. In it explained that on the one hand for certain wash cycles and in particular for the Spin dry in the drum of a washing machine or spin dryer contained laundry a high-speed electric motor drive is desirable, while on the other hand the mechanical Components of the machine acting forces, especially due to unbalance fluctuating centrifugal forces, damage to the machine such as in particular the suspension and storage of the drum. That's why it is desirable to know the current loading situation to the electromotive Drum drive to an optimally high drum speed to be able to limit.

Dazu wird nach jener Vorveröffentlichung oberhalb der Anlagedrehzahl (bei der die Wäsche zentrifugalbedingt nicht mehr in der Trommel herumgewirbelt wird) ein dem Masseträgheitsmoment der mit der Wäsche beladenen Trommel etwa proportionaler Kennwert ermittelt, welcher seinerseits der Differenz der Drehmomente für eine konstante Trommeldrehzahl und für eine aktuelle Beschleunigung der Trommeldrehzahl proportional sowie der aktuellen Winkelbeschleunigung umgekehrt proportional ist. Das erbringt allerdings systembedingt einen ungenaueren Kennwert als Basisinformation für eine beladungsabhängige Motorsteuerung, weil die konstruktionsbedingte Maschinenreibung darin weniger berücksichtigt ist; aber vor allem, weil beim Ansteigen der Trommeldrehzahl über die in den Kennwert eingehende konstante Drehzahl hinaus die noch feuchte Wäsche zusätzlich entwässert wird, wodurch sich die wirksame Beladung der Trommel gegenüber der vorangegangenen Drehmomentenmessung mit konstanter Drehzahl zunehmend verringert.For this purpose, after the previous publication above the system speed (at the the laundry is no longer whirled around in the drum due to centrifugal effects) about the moment of inertia of the drum loaded with the laundry proportional characteristic value determined, which in turn is the difference of the torques for a constant drum speed and for a current acceleration proportional to the drum speed and the current angular acceleration is inversely proportional. However, this results in an imprecise system Characteristic value as basic information for a load-dependent engine control, because the design-related machine friction takes less into account is; but mainly because when the drum speed rises above that in the Characteristic value incoming constant speed additionally the still damp laundry is dewatered, which counteracts the effective loading of the drum the previous torque measurement at constant speed increasingly diminished.

In Erkenntnis dieser Gegebenheiten liegt vorliegender Erfindung die technische Problemstellung zugrunde, zwecks besserer Optimierungsmöglichkeit der Schleuderdrehzahl über das Erfassen der elektrischen Leistungsaufnahme des Antriebsmotors für die Trommelrotation eine genauere Aussage über die aktuelle Beladung der Wäschetrommel zu erzielen.In the knowledge of these circumstances, the present invention is technical Problem based, in order to better optimize the spin speed by detecting the electrical power consumption of the drive motor for the drum rotation a more precise statement about the current load to achieve the laundry drum.

Diese Aufgabe ist erfindungsgemäß durch die im Patentanspruch angegebene Merkmalskombination gelöst. Nach jener Lösung wird, wieder über die elektrische Leistungsaufnahme des Antriebsmotors für die Rotation der Wäschetrommel, ein Maß für deren Masseträgheitsmoment und damit für deren aktuelle Beladung gewonnen, nun aber bei konstant bleibender Entwässerung; nämlich aus der Differenz einerseits des Mittelwertes der gerätereibungsbedingten Leistungsaufnahmen bei zwei verschiedenen (jeweils momentan konstant gehaltenen) Drehgeschwindigkeiten und andererseits der Energieaufnahme während einer Beschleunigungsphase von der unteren zurück auf die höhere Drehzahl. Da diese drei Meß-Phasen mit der Phase der höheren Drehgeschwindigkeit der Trommel begonnen werden, bleibt auch über die folgenden beiden Meßphasen wegen ihrer niedrigeren Trommeldrehzahlen der zuvor erreichte Entwässerungszustand der Wäsche erhalten, so daß während keiner der Meßphasen mit unterschiedlichen Trommeldrehzahlen eine nennenswerte Veränderung der Beladung der Wäschetrommel infolge drehzahlabhängiger Entwässerung mehr eintritt.This object is achieved by the one specified in the claim Combination of features solved. After that solution becomes, again about the electrical Power consumption of the drive motor for the rotation of the laundry drum, a measure of their moment of inertia and thus of their current loading won, but now with constant drainage; namely from the difference on the one hand the mean value of the power consumption due to device friction at two different (currently held constant) rotation speeds and on the other hand the energy consumption during an acceleration phase from the lower back to the higher speed. Since these three measurement phases start with the phase of the higher rotational speed of the drum, also remains over the following two measurement phases due to their lower drum speeds the previously reached dewatering condition of the laundry, so that during none of the measuring phases with different drum speeds a noteworthy change in the loading of the laundry drum due to speed-dependent Drainage more occurs.

Die Leistungsmessungen während der beiden unterschiedlichen konstanten Drehzahlen und über die zu messende Dauer der abschließenden Beschleunigungsphase erfolgen vorteilhaft in als solcher bekannter Weise durch Spannungs- und Strommessung am Gleichstromzwischenkreis für einen steuerbaren Frequenz- bzw. Spannungswandler zur Drehzahlbeeinflussung eines synchron oder asynchron arbeitenden Drehfeld-Wechselstrommotors oder eines Gleichstrom-Universalmotors als dem Trommelantrieb.The power measurements during the two different constant speeds and the duration of the final acceleration phase to be measured are advantageously carried out in a manner known per se by means of voltage and Current measurement on the DC link for a controllable frequency or voltage converter for influencing the speed of a synchronous or asynchronous working three-phase AC motor or a DC universal motor than the drum drive.

Es können nun also höhere Schleuderdrehzahlen ohne konstruktive Gefährdung der Maschine realisiert werden, da ein recht genauer Kennwert für die aktuelle Trommelbeladung zur beladungsabhängigen Drehzahlbegrenzung zur Verfügung steht; wofür der Kennwert erfindungsgemäß z.B. erzielt wird, indem ein programmgemäß aktuelles Hochlaufen in eine Schleuderdrehzahl vorübergehend unterbrochen wird, um für die momentan erreichte Drehzahl und sodann für eine dagegen verringerte, also nicht zu weiterer Entwässerung der Wäsche in der Trommel führende weitere Drehzahl jeweils die elektrische Leistungsaufnahme des Antriebsmotors zu messen, woraufhin noch der Energiebedarf und die Beschleunigungszeitspanne bis zum Wieder-Erreichen der ersterwähnten, höheren Drehzahl gemessen werden, aus der heraus sodann ggf. die weitere Beschleunigung bis auf die Schleuderdrehzahl erfolgen kann. Diese ist konstruktionsbedingt, also abhängig vom Maschinentyp, beladungsabhängig zu begrenzen; nämlich nach Maßgabe des momentanen Massenträgheitsmomentes der Trommel, das seinerseits der Beschleunigungsenergie abzüglich der Reibenergie während der Beschleunigungsphase proportional ist. Diese Reibenergie wiederum bestimmt sich aus dem Mittelwert der beiden bei konstanten Drehzahlen gemessenen Reibleistungen und der Beschleunigungszeitspanne.So now higher spin speeds can be used without any design risk of the machine can be realized as a very precise characteristic value for the current one Drum loading available for load-dependent speed limitation stands; for which the characteristic value according to the invention e.g. is achieved by a program current ramp-up to a spin speed temporarily is interrupted in order for the currently reached speed and then for a on the other hand reduced, ie not to further drain the laundry in the Additional speed of the drum leading to the electrical power consumption of the drive motor to measure, whereupon still the energy requirement and the acceleration period until the first mentioned, higher one is reached again Speed are measured, from which then the further acceleration, if necessary down to the spin speed. This is due to the design, So depending on the machine type, limit depending on the load; namely in accordance with the momentary moment of inertia of the drum, which in turn the acceleration energy minus the friction energy during the acceleration phase is proportional. This friction energy in turn is determined from the mean value of the two friction powers measured at constant speeds and the acceleration period.

Zur näheren Erläuterung dieser erfindungsgemäßen Lösung und ihrer Anwendung ist in der Zeichnung ein stark abstrahierter Drehzahlverlauf über der Zeit für die drei Meß-Phasen I, II und III skizziert, deren Folge wie gesagt vorzugsweise in den jeweiligen (in der Zeichnung gestrichelt dargestellten) Hochlauf zum Trockenschleudern eingeschaltet wird, um aktuell die beladungsabhängig schon zulässige Trommeldrehzahl n für den gerade bevorstehenden Schleudergang zu bestimmen. Daraufhin folgt wieder der reguläre Betrieb der Maschine, also gewöhnlich (wie gestrichelt skizziert) eine Fortsetzung der bisherigen Beschleunigung bis zum Erreichen der momentan zulässigen höchsten Schleuderdrehzahl n. Die für die aktuelle Beladung höchstzulässige Schleuderdrehzahl bestimmt sich aus dem aktuellen Masseträgheitsmoment, zweckmäßigerweise unter Berücksichtigung der aktuellen Unwuchtigkeit der Trommelbeladung. Für letztere sind verschiedene Abschätzungsverfahren bekannt, die vorzugsweise in die Meß-Phase II implementiert werden. Die Bestimmung des Masseträgheitsmomentes erfolgt dann im Anschluß an die Meß-Phase III.For a more detailed explanation of this solution according to the invention and its application is a strongly abstracted speed curve over time for the three measurement phases I, II and III outlined, the sequence of which, as I said, preferably in the respective run-up (shown in dashed lines in the drawing) for spin drying is switched on to currently allow the load-dependent already Drum speed n for the upcoming spin cycle too determine. This is followed by the regular operation of the machine, i.e. usually (as outlined in dashed lines) a continuation of the previous acceleration until the highest permitted spin speed n is reached. The maximum permitted spin speed for the current load is determined from the current moment of inertia, expediently taking into account the current imbalance of the drum load. For the latter are Various estimation methods are known, preferably in the measurement phase II are implemented. The moment of inertia is determined then after the measurement phase III.

Da der Grad der Entwässerung der Wäsche in der Trommel durch die in den drei aufeinanderfolgenden Meßphasen I, II, III auftretende höchste Drehzahl n1 gegeben ist, während bei dagegen abgesenkter Drehzahl n2 dann praktisch kein Ausschleudern von Feuchtigkeit mehr auftritt, erfolgen zur Bestimmung eines Proportionalitätsfaktors für die maximal zulässige Winkelgeschwindigkeit der Trommel die Messungen mit der aktuellen Masseträgheit ihrer Beladung ohne Verfälschung durch eine Verringerung der rotierenden Masse infolge etwa unterdessen, während der Messung, eintretender weiterer Entwässerung.Because the degree of drainage of the laundry in the drum by those in the three successive measurement phases I, II, III given the highest speed n1 is, while practically no ejection when the speed n2 is reduced more of moisture occurs to determine a proportionality factor for the maximum permissible angular velocity of the Drum the measurements with the current inertia of your load without Adulteration due to a reduction in the rotating mass due to meanwhile, during the measurement, further drainage occurs.

Um jenen Proportionalitätsfaktor für die aktuelle Trommelbeladung und deshalb auch für die maximal zulässiger Trommeldrehzahl zu ermitteln, wird während des Betriebes der Maschine ihr Antrieb der Wäschetrommel bei Erreichen einer ersten Drehzahl n1 vorübergehend konstant gehalten (Phase I im Drehzahl-Zeit-Diagramm der Zeichnung). Die währenddessen aufgenommene elektrische Antriebsleistung P1 ist konstruktiv bedingt, insbesondere der mechanischen Reibleistung der Trommellagerung proportional. Für die darauf folgende Meß-Phase II wird der elektrische Trommelantrieb zunächst auf eine gegenüber der Phase I niedrigere Drehzahl n2 der Wäschetrommel abgebremst oder auslaufen gelassen, die dann ihrerseits während der Strommeß-Phase II konstant gehalten wird, um erneut, nun für diese niedrigere Drehzahl n2, über die elektrische Leistungsaufnahme P2 des Antriebsmotors für die Trommel deren nun konstruktiv bestimmten Leistungsbedarf zu bestimmen. Hieran schließt sich als Meß-Phase III eine konstante und möglichst starke Beschleunigung der Wäschetrommel von der momentanen Drehzahl n2 auf den vorherigen Wert der Drehzahl n1 an, über deren Beschleunigungszeitdauer tb die Energieaufnahme Eb als Integral der Leistung Pb und Zeit tb ermittelt wird.That proportionality factor for the current drum loading and therefore also for the maximum permissible drum speed is determined during the Operation of the machine driving the laundry drum when reaching a first Speed n1 temporarily held constant (phase I in the speed-time diagram the drawing). The electrical drive power consumed in the meantime P1 is due to the design, in particular the mechanical friction proportional to the drum bearing. For the subsequent measurement phase II the electric drum drive is initially set to a phase I lower speed n2 of the laundry drum braked or let it run out, which in turn is then kept constant during the current measurement phase II again, now for this lower speed n2, via the electrical power consumption P2 of the drive motor for the drum whose design is now determined To determine the power requirement. This is followed by a constant phase III and the greatest possible acceleration of the laundry drum from the current one Speed n2 to the previous value of speed n1, above which Acceleration time tb the energy consumption Eb as an integral of the power Pb and time tb is determined.

Wie unter dem Diagramm der Zeichnung formelmäßig angegeben, ist die potentielle Energie bei der höheren Drehzahl n1 (als Produkt aus Masseträgheitsmoment und Winkelgeschwindigkeit) proportional der Summe aus der potentiellen Energie bei der niedrigeren Drehzahl n2 und der Energieaufnahme Eb während der Beschleunigungsphase III abzüglich der konstruktiv bedingten Reibungsenergie während der Beschleunigungsphase, also dem Produkt aus dem Mittelwert der beiden gemessenen Reibleistungen P1, P2 und der Dauer tb der Beschleunigungsphase III. Daraus ergibt sich durch Umrechnung als Kennwert, nämlich als maschinenabhängiger Proportionalitätsfaktor für die aktuell zulässige Schleuderdrehzahl, das aktuelle Masseträgheitsmoment als proportional zur Differenz aus einerseits der erwähnten Energieaufnahme Eb während der Phase III und andererseits dem Produkt aus dem Mittelwert der beiden Reibleistungen P1, P2 und der Beschleunigungsdauer tb der Phase III; wobei in der Formeldarstellung berücksichtigt ist, daß der Mittelwert beider Leistungsgrößen die halbe Leistungssumme ist, so daß für den Proportionalitätsfaktor direkt die gemessene Leistungssumme angesetzt werden kann.As indicated by the formula in the diagram of the drawing, the potential is Energy at the higher speed n1 (as a product of the moment of inertia and angular velocity) proportional to the sum of the potential Energy at the lower speed n2 and the energy consumption Eb during acceleration phase III minus the design-related friction energy during the acceleration phase, i.e. the product of the mean of the both measured friction powers P1, P2 and the duration tb of the acceleration phase III. This results from conversion as a characteristic value, namely as a machine-dependent one Proportionality factor for the currently allowed spin speed, the current moment of inertia as proportional to the difference from the one hand the mentioned energy consumption Eb during phase III and on the other hand the product of the mean value of the two friction powers P1, P2 and the acceleration duration phase III tb; taking into account in the formula representation is that the mean value of both performance quantities is half the performance sum, so that the measured power sum is applied directly to the proportionality factor can be.

Da also in diesen Proportionalitätsfaktor abgesehen von der Ermittlung der Zeitdauer der Phase III lediglich elektrische Leistungsmessungen eingehen, die im Gleichstromzwischenkreis als Strom- und Spannungsmessungen leicht und genau durchführbar sind, ergibt das erfindungsgemäße Vorgehen einen reproduzierbaren Kennwert für die aktuelle Trommelbeladung und somit abhängig von konstruktiven Maschinendaten für eine diesbezüglich optimierte Geschwindigkeitsbegrenzung beim Beschleunigen der Wäschetrommel auf eine möglichst hohe Schleuderdrehzahl.So since in this proportionality factor apart from the determination of the duration Phase III only receive electrical power measurements that are in the DC intermediate circuit as current and voltage measurements easily and accurately are feasible, the procedure according to the invention results in a reproducible Characteristic value for the current drum load and thus dependent on the design Machine data for an optimized speed limit when accelerating the laundry drum to the highest possible spin speed.

Claims (1)

Verfahren zum Bestimmen der Beladung der Trommel einer Wäschebehandlungsmaschine durch Ermitteln des Massenträgheitsmomente der mit Wäsche beladenen Trommel aus der elektrischen Leistungsaufnahme des Antriebsmotors für die bei verschiedenen Drehzahlen oberhalb der Anlagedrehzahl rotierenden Trommel,
dadurch gekennzeichnet, dass die aufgenommene elektrische Leistung des Motors bei einer ersten konstanten und dann bei einer zweiten, dagegen niedrigeren konstanten Drehzahl sowie hieran anschließend während einer Beschleunigungsphase gemessen wird, während welcher die Drehzahl wieder bis auf die erste konstante Drehzahl ansteigt, mit Bilden der Differenz aus der Energieaufnahme während der Beschleunigungsphase (Eb) einerseits und andererseits dem Produkt der Beschleunigungszeit (tb) mit dem Mittelwert aus den beiden bei konstanten Drehzahlen mit konstanter Vorentwässerung gemessenen Reibleistungen (P1, P2) der Trommeldrehung.Method for determining the loading of the drum of a laundry treatment machine by determining the mass moments of inertia of the drum loaded with laundry from the electrical power consumption of the drive motor for the drum rotating at different speeds above the system speed,
characterized in that the electrical power consumed by the motor is measured at a first constant and then at a second, however lower constant speed, and thereafter during an acceleration phase during which the speed increases again to the first constant speed, with the difference being formed from the energy consumption during the acceleration phase (Eb) on the one hand and on the other hand the product of the acceleration time (tb) with the mean value of the two friction powers (P1, P2) of the drum rotation measured at constant speeds with constant pre-dewatering.
EP04002620A 2003-02-12 2004-02-06 Method for determining the load in the drum of a laundry treatment machine Expired - Lifetime EP1447469B1 (en)

Applications Claiming Priority (2)

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DE10305675 2003-02-12
DE10305675A DE10305675B3 (en) 2003-02-12 2003-02-12 Drum loading determination method for laundry machine using measured electrical power requirements of electric drive motor for loaded laundry drum

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EP1447469A2 true EP1447469A2 (en) 2004-08-18
EP1447469A3 EP1447469A3 (en) 2006-05-17
EP1447469B1 EP1447469B1 (en) 2009-04-01

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EP (1) EP1447469B1 (en)
AT (1) ATE427376T1 (en)
DE (2) DE10305675B3 (en)
ES (1) ES2321396T3 (en)

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US20040154350A1 (en) 2004-08-12
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EP1447469B1 (en) 2009-04-01
ATE427376T1 (en) 2009-04-15

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