EP1447469B1 - 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
EP1447469B1
EP1447469B1 EP04002620A EP04002620A EP1447469B1 EP 1447469 B1 EP1447469 B1 EP 1447469B1 EP 04002620 A EP04002620 A EP 04002620A EP 04002620 A EP04002620 A EP 04002620A EP 1447469 B1 EP1447469 B1 EP 1447469B1
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EP
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Prior art keywords
drum
speed
constant
rotation speed
laundry
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EP04002620A
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German (de)
French (fr)
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EP1447469A2 (en
EP1447469A3 (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 claim.
  • the system speed determines a mass moment of inertia of the loaded with the laundry drum approximately proportional characteristic, which in turn the difference of the torques for a constant drum speed and for a current Acceleration of the drum speed proportional and the current angular acceleration is inversely proportional.
  • the present invention is based on the technical problem to achieve a more accurate statement about the current load of the laundry drum for better optimization of the spin speed on the detection of the electrical power consumption of the drive motor for the drum rotation.
  • the power measurements during the two different constant speeds and over the duration of the final acceleration phase to be measured are advantageously carried out in a known manner by voltage and current measurement at the DC link for a controllable frequency or voltage converter for speed control of a synchronous or asynchronous working AC induction motor or a DC universal motor as the drum drive.
  • the potential energy at the higher speed n1 (as product of mass moment of inertia and angular velocity) is proportional to the sum of the potential Energy at the lower speed n2 and the energy absorption Eb during the acceleration phase III minus the design-related friction energy during the acceleration phase, ie the product of the average of the two measured friction losses P1, P2 and the duration tb of the acceleration phase III.
  • the procedure according to the invention produces a reproducible characteristic value for the current drum load and thus dependent on constructive machine data for a speed limit optimized in this regard when accelerating the laundry drum to the highest possible spin speed.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Control Of Multiple Motors (AREA)

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 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 procedure is from the own DE 44 31 846 C2 known. It is stated that on the one hand for certain washes and in particular for the spin-drying of the laundry contained in the drum of a washing machine or a spin dryer a hochtouriger electromotive drive is desirable, while on the other hand, then acting on the mechanical components of the machine forces, in particular unbalanced fluctuating centrifugal forces , Damage to the machine, in particular to the suspension and storage of the drum can cause. Therefore, it is desirable to know the current loading situation in order to limit the electric motor drive of the drum to a tuned optimally high drum speed.

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, according to that prior publication above the system speed (in which the laundry is centrifugally no longer swirled around in the drum) determines a mass moment of inertia of the loaded with the laundry drum approximately proportional characteristic, which in turn the difference of the torques for a constant drum speed and for a current Acceleration of the drum speed proportional and the current angular acceleration is inversely proportional. However, due to the system, this provides a more inaccurate characteristic as basic information for a load-dependent engine control because the design-related engine friction takes less into account is; but above all because when the drum speed increases beyond the constant speed entering into the characteristic value, the still moist laundry is additionally dewatered, as a result of which the effective loading of the drum with respect to the preceding constant-speed torque measurement is increasingly reduced.

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 recognition of these circumstances, the present invention is based on the technical problem to achieve a more accurate statement about the current load of the laundry drum for better optimization of the spin speed on the detection of the electrical power consumption of the drive motor for the drum rotation.

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 feature combination specified in the claim. After that solution, again on the electrical power consumption of the drive motor for the rotation of the laundry drum, a measure of their mass moment of inertia and thus gained for their current load, but now with constant dewatering; namely from the difference of the one hand, the average value of the power consumption due to device friction at two different (each momentarily held constant) rotational speeds and on the other hand the energy consumption during an acceleration phase from the lower back to the higher speed. Since these three measuring phases are started with the phase of the higher rotational speed of the drum, the previously achieved dewatering state of the laundry is maintained over the following two measuring phases because of their lower drum speeds, so that during each of the measuring phases with different drum speeds, a significant change in the load the laundry drum due to speed-dependent drainage occurs more.

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 over the duration of the final acceleration phase to be measured are advantageously carried out in a known manner by voltage and current measurement at the DC link for a controllable frequency or voltage converter for speed control of a synchronous or asynchronous working AC induction motor or a DC universal motor as 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 realized without constructive endangerment of the machine, since a fairly accurate characteristic value for the current drum load for load-dependent speed limitation is available; for which the characteristic value is according to the invention e.g. is achieved by a program according to current ramp-up is temporarily interrupted in a spin speed to measure for the currently achieved speed and then for a reduced, so not to further dehydration of the laundry in the drum leading further speed each electrical power input of the drive motor, whereupon the energy requirement and the acceleration period until the re-reaching of the first-mentioned higher speed are measured, from which the further acceleration up to the spin speed can then take place. This is due to the design, so depending on the machine type, load-dependent limit; namely in accordance with the instantaneous mass moment of inertia of the drum, which in turn is proportional to the acceleration energy minus the friction energy during the acceleration phase. This friction energy in turn is determined from the mean value of the two friction losses measured at constant speeds and the acceleration time span.

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 highly abstracted speed curve over time for the three measuring phases I, II and III sketched in the drawing, the sequence as mentioned preferably in the respective (dashed lines in the drawing) run-up to Drying is turned on to currently determine the load-dependent already permissible drum speed n for the upcoming spin cycle. Then follows again the regular operation of the machine, so usually (as dashed lines) a continuation of the previous acceleration until reaching the currently permissible maximum spin speed n. The maximum permitted for the current load spin speed is determined by the current mass moment of inertia, expediently taking into account the current Imbalance of the drum loading. For the latter are Various estimation methods are known, which are preferably implemented in the measuring phase II. The determination of the mass moment of inertia then takes place following 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.Since the degree of dehydration of the laundry in the drum is given by the occurring in the three successive measurement phases I, II, III maximum speed n1, while in contrast lowered speed n2 then virtually no ejection of moisture occurs, carried out to determine a proportionality factor for the maximum allowable angular velocity of the drum measurements with the current inertia of their loading without distortion by a reduction in the rotating mass due to, meanwhile, during the measurement, occurring further dewatering.

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.In order to determine that proportionality factor for the current drum load and therefore also for the maximum permissible drum speed, during the operation of the machine, its drive of the laundry drum is temporarily kept constant when a first speed n1 is reached (phase I in the speed-time diagram of the drawing). The electrical drive power P1 recorded during this time is structurally conditioned, in particular proportional to the mechanical frictional loss of the drum bearing. For the subsequent measurement phase II, the electric drum drive is first braked or allowed to run at a lower speed n2 of the laundry drum than the phase I, which in turn is kept constant during the current measuring phase II, again, now for this lower speed n2, via the electrical power consumption P2 of the drive motor for the drum to determine their now constructively determined power requirements. This is followed by a constant and strong acceleration of the laundry drum from the current speed n2 to the previous value of the speed n1 as measuring phase III, over whose acceleration time tb the energy consumption Eb is determined as the integral of the power Pb and time tb.

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 formulaically in the diagram of the drawing, the potential energy at the higher speed n1 (as product of mass moment of inertia and angular velocity) is proportional to the sum of the potential Energy at the lower speed n2 and the energy absorption Eb during the acceleration phase III minus the design-related friction energy during the acceleration phase, ie the product of the average of the two measured friction losses P1, P2 and the duration tb of the acceleration phase III. This results from conversion as a characteristic value, namely as a machine-dependent proportionality factor for the currently permissible spin speed, the current mass moment of inertia as proportional to the difference of on the one hand said energy absorption Eb during phase III and on the other hand the product of the average of the two friction losses P1, P2 and Acceleration time tb of phase III; wherein it is taken into account in the formula representation that the mean value of both power quantities is half the power sum, so that the proportional power factor can be directly applied for the proportionality factor.

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.Since, apart from the determination of the time duration of Phase III, only electrical power measurements are received in this proportionality factor which can be easily and accurately carried out in the DC intermediate circuit as current and voltage measurements, the procedure according to the invention produces a reproducible characteristic value for the current drum load and thus dependent on constructive machine data for a speed limit optimized in this regard when accelerating the laundry drum to the highest possible spin speed.

Claims (1)

  1. Method for determining the loading of the drum of a laundry-treatment machine by establishing the moment of mass inertia of the drum, which is loaded with laundry, from the electrical power consumption of the drive motor for the drum which rotates at different rotation speeds above the resting rotation speed,
    characterized
    in that the consumed electrical power of the motor is measured at a first constant rotation speed and then at a second, relatively lower constant rotation speed and subsequently during an acceleration phase during which the rotation speed again rises to the first constant rotation speed, with the difference between the energy consumption during the acceleration phase (Eb) on one hand and, on the other hand, the product of the acceleration time (tb) and the average value of the two frictional powers (P1, P2) of the drum rotation, which are measured at constant rotation speeds with constant preliminary removal of water, being calculated.
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)

Application Number Priority Date Filing Date Title
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 EP1447469A2 (en) 2004-08-18
EP1447469A3 EP1447469A3 (en) 2006-05-17
EP1447469B1 true EP1447469B1 (en) 2009-04-01

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US (1) US7162759B2 (en)
EP (1) EP1447469B1 (en)
AT (1) ATE427376T1 (en)
DE (2) DE10305675B3 (en)
ES (1) ES2321396T3 (en)

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ATE427376T1 (en) 2009-04-15
DE502004009252D1 (en) 2009-05-14
EP1447469A2 (en) 2004-08-18
EP1447469A3 (en) 2006-05-17
US7162759B2 (en) 2007-01-16
ES2321396T3 (en) 2009-06-05
US20040154350A1 (en) 2004-08-12

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