EP1736589B1 - Washing machine with unbalance detector - Google Patents
Washing machine with unbalance detector Download PDFInfo
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- EP1736589B1 EP1736589B1 EP06011034.3A EP06011034A EP1736589B1 EP 1736589 B1 EP1736589 B1 EP 1736589B1 EP 06011034 A EP06011034 A EP 06011034A EP 1736589 B1 EP1736589 B1 EP 1736589B1
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- drum
- washing machine
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- machine according
- imbalance
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- 238000005406 washing Methods 0.000 title claims description 23
- 238000005259 measurement Methods 0.000 claims description 21
- 230000001133 acceleration Effects 0.000 claims description 20
- 230000010363 phase shift Effects 0.000 claims description 15
- 230000006870 function Effects 0.000 claims description 13
- 230000004888 barrier function Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000006798 recombination Effects 0.000 claims 3
- 238000005215 recombination Methods 0.000 claims 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000001419 dependent effect Effects 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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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
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
- D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
- D06F37/225—Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets
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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
- A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L13/10—Scrubbing; Scouring; Cleaning; Polishing
- A47L13/20—Mops
- A47L13/24—Frames for mops; Mop heads
- A47L13/254—Plate frames
- A47L13/258—Plate frames of adjustable or foldable type
-
- 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
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
- A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles
- A47L9/149—Emptying means; Reusable bags
-
- 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
- D06F34/16—Imbalance
-
- 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
- D06F2103/26—Imbalance; Noise level
Definitions
- the invention relates to a washing machine according to the preamble of claim 1.
- Such a washing machine is eg in EP 1 391 549 described. It has a drum which rotates about an axis of rotation, a measuring device for detecting an imbalance in the drum in the spinning operation, with which as a function of the rotation angle of the drum measured values can be generated, and a controller for determining the position and / or size of the imbalance the measured values. Because of the unbalance parameters thus obtained, the unbalance can be compensated for and / or the spin program can be interrupted if there is too much imbalance, eg to redistribute the laundry to be spun in the drum.
- the washing machine includes a memory for storing calibration values, wherein the controller of the washing machine is configured to determine the position and / or size of the imbalance by calculating the measured values with the calibration values.
- idle measurements are stored in memory as a function of the angle of rotation, i. the measured values, as determined during a calibration measurement with an empty drum.
- the controller calculates from the measured values, e.g. quotient corrected quantities from which e.g. By subtraction with the idle measurement values from this, the position and / or size of the imbalance can be determined.
- the phase shift between the measured values and the position of the imbalance as a function of the rotational speed of the drum is stored in the memory of the washing machine. Since this phase shift is speed-dependent, the position of the imbalance can be determined by calculating the measured values with the phase shift as a function of the rotational speed of the drum.
- the washing machine shown has a drum 1 with a horizontal axis of rotation 2.
- the drum 1 is arranged in a tub 3.
- a motor 4 is fixed, which drives the drum via a belt 5 and a pulley 6 in a known manner for rotation.
- the tub 3 is mounted with a suspension swinging in the washing machine.
- acceleration sensors 7 are mounted at the front and, opposite, at the rear end of the tub 3, which allow to determine a pivoting and / or tumbling movement of the tub.
- an angular velocity sensor 8 is provided, with which in the manner described below, the instantaneous angular velocity can be measured as a function of the rotational angle of the drum.
- distance sensors can also be used.
- the sensors make it possible to detect an imbalance in the drum when spinning or at the beginning of the spin program.
- the spinning process can also be interrupted, as already mentioned.
- three tanks 10 are provided for unbalance compensation, which are arranged in the ribs 11 of the drum 1.
- Each tank 10 extends e.g. with its longitudinal axis over the entire axial length of the drum 1.
- three filling rings 13a, b and c are arranged at the rear end face 12 of the drum 1.
- the filling rings are coaxial, wherein filling ring 13a has the smallest diameter, filling ring 13b has the next largest diameter and filling ring 13c has the largest diameter.
- Each of the filling rings is connected via a filling tube 14 with one of the tanks 10 in combination.
- a stationary injector 16 is provided to inject water into the packing rings. It comprises a water inlet 17 which supplies water to three valves 18. From the valves 18, the water passes through a drop section 19 to a respective tube 19 a, wherein the drop section 19, a backflow of water into the water inlet 17 prevented.
- the hoses 19a terminate in nozzles 19b, of which the water is injected into the individual filling rings 13a, b, c.
- the nozzles 19b are mounted on the tub 3 and on the oscillating system of the washing machine.
- Fig. 2 schematically shows again the mechanical structure of the washing machine and the controller 20th
- Fig. 2 the drum 1 and its axis of rotation 2.
- a rotary body 21 which, as from Fig. 1 can be configured, for example, as a disc which is arranged on the pulley 6.
- the rotary body 21 rotates with the drum. He carries a variety of markings, which are configured in the embodiment shown as regularly distributed over the periphery of the rotating body teeth 22.
- the stationary on the rotary body 21 arranged angular velocity sensor 8 is able to detect the markings.
- the angular velocity sensor 8 is designed as a light barrier whose light path is interrupted by the teeth 22.
- optical detector which detects the optically detectable markings on the rotary body 21. It may also be non-optical, e.g. Magnetic measurement methods are used in conjunction with appropriately designed markings.
- Fig. 3 shows a corresponding series of measured values of periods t0 when the drum is idling, ie when the drum is empty. Since in the present example, the teeth are all the same size and equally spaced, the measured times are all about the same size. In the Fig. 3 The variations shown are due to asymmetries in the structure of the rotating parts and inaccuracies in the manufacture of the teeth 22.
- Each of the time values thus determined is inversely proportional to the instantaneous angular velocity of the drum 1.
- the instantaneous angular velocity of the drum 1 is dependent on the current angle of rotation.
- a corresponding measurement series of durations t is in Fig. 4 shown. As can be seen, the angular velocity is varied approximately sinusoidally.
- the magnitude of the imbalance is reflected in the amplitude of the sinusoidal variation in Fig. 4 down, the position in the phase position of the signal.
- the sectors i In order to deduce the angular position of the imbalance from a given phase position of the measuring signal, the sectors i must be in accordance with Fig. 3 or 4 each can be assigned to a rotation angle of the drum.
- a zero point sensor is provided which emits a signal when the drum is in a specific zero position.
- the idling measured values t0 (i) are according to Fig. 3 stored as a function of the rotation angle ⁇ and the sector i in a memory 23 of the controller 20, and the controller 20 is designed to readjust the position and / or size of the unbalance by calculating the measured values t (i) measured Fig. 4 with the idling measured values t0 (i).
- the difference d i t i / ⁇ t j - t ⁇ 0 i / ⁇ t ⁇ 0 j are formed for the measured value of each sector or angle of rotation i, the sums extending over all sectors j. For the determination of amplitude and phase of the unbalance, the difference d (i) thus obtained is then used.
- the calibration values t0 (i) can be stored by the manufacturer in the memory 23, e.g. as part of the final test of a device. However, they may also be detected, at least in part, at a later time by the controller 20 and stored, e.g. by starting a particular calibration program during which measurements are performed on an empty drum. This is particularly useful when the angular velocity sensor 8 or the rotating body 21 must be replaced during maintenance or repair work.
- the embodiment shown has Fig. 1
- two acceleration sensors 7 Preferably, these different sensor types are used in addition. It turns out that at lower angular velocities, the angular velocity sensor 8 provides the most accurate results while the signals from the acceleration sensors 7 are relatively weak. At higher angular speeds, the signals of the acceleration sensors 7 become stronger, while those of the angular velocity sensor 8 lose their meaningfulness.
- the signals of the acceleration sensors 7 measured at certain times must be associated with the angular position of the drum 1.
- the already mentioned zero point transmitter can be provided which emits a signal when the drum is in a specific zero position.
- the instantaneous speed D of the drum 1 which can be determined, for example, via the zero point encoder
- it is possible to measure the acceleration sensors at a given time tx Angular position ⁇ according to the formula ⁇ t ⁇ x - t ⁇ n ⁇ D ⁇ 360 ° assigned.
- FIG. 5 A corresponding course of the phase shift is in Fig. 5 shown.
- the course of the phase shift differs in practice from a simple arctan behavior, since the suspension has several resonance frequencies and several degrees of freedom.
- the phase shift between the signals of the acceleration sensors 7 and the position of the imbalance as a function of the speed is in a memory 25 of the controller 20 the drum 1 is stored. This can be done eg in the form of individual values according to Fig. 5 or in the form of the parameters according to the values according to Fig. 5 adjusted curve.
- the phase shift stored in the memory 25 as a function of the rotational speed of the drum 1 forms calibration values with which the position measurements can be corrected.
- the microprocessor 24 of the controller 20 determines the phase position of the measured acceleration values, for example by means of Fourier transformation or cosine transformation, wherein the amplitude can also be determined in the same calculation step. To the determined phase position, the microprocessor 24 adds the phase shift according to the calibration values from memory 25 to this speed, resulting in the angular position of the imbalance. Depending on this angular position, for example, the tanks 10 can now be filled. For this purpose, the controller 20 outputs control signals corresponding to a valve control 26.
- acceleration sensors 7 which measure axial and / or radial accelerations of the drum 1 or of the oscillating system
- position sensors which measure the axial or radial deflections of the drum 1, the tub 3 or other parts of the oscillating system
- the mean value of the signals of the acceleration sensors 7 is used for processing. This produces a signal independent of tilting of the drum.
- the calibration values ie the course of the phase shift according to Fig. 5 , can be stored by the manufacturer in the memory 25 by measurements on a drum with a known, attached to a defined position imbalance can be performed. In this case, the same calibration values can be used per se for all devices of the same type of the same type.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
Description
Die Erfindung betrifft eine Waschmaschine gemäss Oberbegriff von Anspruch 1.The invention relates to a washing machine according to the preamble of claim 1.
Eine derartige Waschmaschine wird z.B. in
Es zeigt sich, dass die Ermittlung von genauen Messwerten in derartigen Waschmaschinen nicht ganz einfach ist. Aufgabe der vorliegenden Erfindung ist somit eine Verbesserung der Messgenauigkeit.It turns out that the determination of accurate readings in such washing machines is not easy. Object of the present invention is thus an improvement of the measurement accuracy.
Diese Aufgabe wird durch die Waschmaschine nach Anspruch 1 gelöst. Demgemäss enthält die Waschmaschine einen Speicher zum Speichern von Kalibrationswerten, wobei die Steuerung der Waschmaschine ist dazu ausgestaltet, die Position und/oder Grösse der Unwucht durch Verrechnen der gemessenen Messwerte mit den Kalibrationswerten zu ermitteln.This object is achieved by the washing machine according to claim 1. Accordingly, the washing machine includes a memory for storing calibration values, wherein the controller of the washing machine is configured to determine the position and / or size of the imbalance by calculating the measured values with the calibration values.
Vorzugsweise sind im Speicher Leerlauf-Messwerte als Funktion des Drehwinkels abgespeichert, d.h. die Messwerte, wie sie bei einer Kalibrationsmessung mit leerer Trommel ermittelt wurden. Die Steuerung errechnet aus den Messwerten z.B. mittels Quotientenbildung korrigierte Grössen, aus denen z.B. durch Subtraktion mit den Leerlauf-Messwerten hieraus die Position und/oder Grösse der Unwucht ermittelt werden kann.Preferably, idle measurements are stored in memory as a function of the angle of rotation, i. the measured values, as determined during a calibration measurement with an empty drum. The controller calculates from the measured values, e.g. quotient corrected quantities from which e.g. By subtraction with the idle measurement values from this, the position and / or size of the imbalance can be determined.
Dadurch lassen sich inhärente Asymmetrien in den drehenden Teilen und der Messvorrichtung eliminieren. Dies ist besonders vorteilhaft, wenn ein Winkelgeschwindigkeits-Sensor zum Einsatz kommt, der Markierungen an einem Drehkörper detektiert. In diesem Fall kann der Einfluss von Ungenauigkeiten in Position und/oder Grösse der Markierungen durch das Verrechnen mit den Leerlauf-Messwerten eliminiert werden.This eliminates inherent asymmetries in the rotating parts and the measuring device. This is particularly advantageous when an angular velocity sensor is used which detects markings on a rotating body. In this case, the influence of inaccuracies in the position and / or size of the markings can be eliminated by the calculation with the idling measured values.
In einer weiteren bevorzugten Ausführung ist im Speicher der Waschmaschine die Phasenverschiebung zwischen den Messwerten und der Position der Unwucht als Funktion der Drehzahl der Trommel abgespeichert. Da diese Phasenverschiebung drehzahlabhängig ist, kann durch Verrechnen der Messwerte mit der Phasenverschiebung in Abhängigkeit der Drehzahl der Trommel die Position der Unwucht bestimmt werden.In a further preferred embodiment, the phase shift between the measured values and the position of the imbalance as a function of the rotational speed of the drum is stored in the memory of the washing machine. Since this phase shift is speed-dependent, the position of the imbalance can be determined by calculating the measured values with the phase shift as a function of the rotational speed of the drum.
Weitere bevorzugte Ausführungen ergeben sich aus den abhängigen Ansprüchen sowie aus der nun folgenden Beschreibung anhand der Figuren. Dabei zeigen:
-
Fig. 1 einen schematischen Schnitt durch eine Waschmaschine, -
Fig. 2 eine schematische Ansicht der Trommel, des Winkelgeschwindigkeits-Sensors und der Steuerung, -
Fig. 3 die vom Winkelgeschwindigkeits-Sensor gemessenen Zeitwerte im Leerlauf, -
Fig. 4 die vom Winkelgeschwindigkeits-Sensor gemessenen Zeitwerte unter Last und -
Fig. 5 die Phasenverschiebung zwischen Messsignal und Unwuchtposition in Abhängigkeit der Drehzahl.
-
Fig. 1 a schematic section through a washing machine, -
Fig. 2 a schematic view of the drum, the angular velocity sensor and the controller, -
Fig. 3 the idle time values measured by the angular velocity sensor, -
Fig. 4 the time values measured by the angular velocity sensor under load and -
Fig. 5 the phase shift between measuring signal and unbalance position as a function of the speed.
Die in
In der dargestellten Ausführung sind am vorderen und, gegenüberliegend, am hinteren Ende des Bottichs 3 Beschleunigungs-Sensoren 7 befestigt, die es erlauben, eine Schwenk- und/oder Taumelbewegung des Bottichs zu bestimmen. Zudem ist beim Riemenrad 6 ein Winkelgeschwindigkeits-Sensor 8 vorgesehen, mit welchem in weiter unten beschriebener Weise die momentane Winkelgeschwindigkeit als Funktion des Drehwinkels der Trommel gemessen werden kann. Anstelle von oder zusätzlich zu den Beschleunigungs-Sensoren 7 bzw. dem Winkelgeschwindigkeits-Sensor 8 können z.B. auch Abstands-Sensoren verwendet werden.In the illustrated embodiment,
Die Sensoren erlauben es, eine Unwucht in der Trommel beim Schleudern bzw. zu Beginn des Schleuderprogramms festzustellen.The sensors make it possible to detect an imbalance in the drum when spinning or at the beginning of the spin program.
Wie z.B. in
Ist die Unwucht zu gross, kann der Schleudervorgang auch, wie bereits erwähnt, unterbrochen werden.If the imbalance is too great, the spinning process can also be interrupted, as already mentioned.
In der dargestellten Ausführung sind zur Unwuchtkompensation drei Tanks 10 vorgesehen, welche in den Rippen 11 der Trommel 1 angeordnet sind. Jeder Tank 10 erstreckt sich z.B. mit seiner Längsachse über die ganze achsiale Länge der Trommel 1. An der hinteren Stirnseite 12 der Trommel 1 sind drei Füllringe 13a, b und c angeordnet. Die Füllringe sind koaxial, wobei Füllring 13a den kleinsten Durchmesser, Füllring 13b den nächst grösseren Durchmesser und Füllring 13c den grössten Durchmesser aufweist.In the illustrated embodiment, three
Jeder der Füllringe steht über ein Füllrohr 14 mit je einem der Tanks 10 in Verbindung.Each of the filling rings is connected via a
Eine stationäre Einspritzvorrichtung 16 ist vorgesehen, um Wasser in die Füllringe einzuspritzen. Sie umfasst einen Wasserzulauf 17, der Wasser an drei Ventile 18 liefert. Von den Ventilen 18 gelangt das Wasser über eine Fallstrecke 19 zu je einem Schlauch 19a, wobei die Fallstrecke 19 ein Rückfliessen von Wasser in den Wasserzulauf 17 verhindert. Die Schläuche 19a enden in Düsen 19b, von denen das Wasser in die einzelnen Füllringe 13a,b,c gespritzt wird. Die Düsen 19b sind am Bottich 3 bzw. am schwingenden System der Waschmaschine angebracht.A
Insbesondere zeigt
Anstelle einer Lichtschranke kann auch ein anderer optischer Detektor verwendet werden, welcher die optisch erkennbaren Markierungen am Drehkörper 21 detektiert. Es können auch nicht-optische, z.B. magnetische Messmethoden im Zusammenhang mit entsprechend ausgestalteten Markierungen angewendet werden.Instead of a light barrier, it is also possible to use another optical detector which detects the optically detectable markings on the
Aus den Signalen des Winkelgeschwindigkeits-Sensors 8 werden Zeitdauern zwischen den Markierungen ermittelt, z.B. in Form der Zeiten zwischen den Signalübergängen.
Jeder der so ermittelten Zeitwerte ist umgekehrt proportional zur momentanen Winkelgeschwindigkeit der Trommel 1.Each of the time values thus determined is inversely proportional to the instantaneous angular velocity of the drum 1.
Wird die Trommel unter Last gedreht und ist die Last so verteilt, dass es zu einer Unwucht kommt, so ist die momentane Winkelgeschwindigkeit der Trommel 1 abhängig vom momentanen Drehwinkel. Eine entsprechende Messreihe von Zeitdauern t ist in
Die Grösse der Unwucht schlägt sich in der Amplitude der sinusförmigen Variation in
Um aus einer gegebenen Phasenlage des Messsignals auf die Winkelposition der Unwucht zu schliessen, müssen die Sektoren i gemäss
Für eine genaue Messung von Amplitude und Phase ist es von Vorteil, den Einfluss der genannten Leerlauf-Schwankungen gemäss
Deshalb sind in einer vorteilhaften Ausführung der Erfindung die Leerlauf-Messwerte t0(i) gemäss
Für eine drehzahlunabhängige Korrektur kann z.B. die Differenz
Denkbar ist auch die Berechnung der Quotienten
Diese Quotienten q(i) sind, wie die Differenzen d(i), ebenfalls unabhängig von den Leerlauf-Schwankungen.These quotients q (i), like the differences d (i), are also independent of the no-load fluctuations.
Die Kalibrationswerte t0(i) können herstellerseitig im Speicher 23 abgelegt werden, z.B. im Rahmen der Endprüfung eines Geräts. Sie können jedoch auch, zumindest teilweise, zu einem späteren Zeitpunkt von der Steuerung 20 ermittelt und gespeichert werden, z.B. durch Start eines bestimmten Kalibrationsprogramms, während welchem Messungen an einer leeren Trommel durchgeführt werden. Dies ist insbesondere dann sinnvoll, wenn der Winkelgeschwindigkeits-Sensor 8 oder der Drehkörper 21 bei Wartungs- oder Reparaturarbeiten ersetzt werden müssen.The calibration values t0 (i) can be stored by the manufacturer in the
Wie bereits erwähnt, besitzt das gezeigte Ausführungsbeispiel gemäss
Soll mit den Beschleunigungs-Sensoren 7 die Position der Unwucht ermittelt werden, müssen zuerst die zu gewissen Zeiten gemessenen Signale der Beschleunigungs-Sensoren 7 mit der Winkelposition der Trommel 1 in Verbindung gebracht werden. Hierzu kann z.B. der bereits genannte Nullpunktgeber vorgesehen werden, welcher ein Signal abgibt, wenn die Trommel sich in einer bestimmten Nullposition befindet. Ausgehend vom Zeitpunkt tn, an welchem diese Nullposition zum letzten Mal erreicht wurde, und der momentanen Drehzahl D der Trommel 1 (welche z.B. auch über den Nullpunktgeber ermittelt werden kann) ist es möglich, einer Messung der Beschleunigungs-Sensoren zu einer gegebenen Zeit tx eine Winkelposition α gemäss der Formel
Weiter ist aber zu berücksichtigen, dass die Phasenverschiebung z.B. zwischen dem Winkel α0, bei welchem das Signal eines der Beschleunigungs-Sensoren 7 z.B. sein Maximum hat, und der Winkelposition αU der Unwucht, abhängig von der Winkelgeschwindigkeit der Trommel 1 ist:
- Bei tiefen Winkelgeschwindigkeiten der Trommel, d.h. wenn die Winkelgeschwindigkeit so gross ist, dass die Wäsche in der Trommel nicht mehr fällt sondern an die Trommelwand angedrückt ist, aber die Drehzahl noch deutlich unter der tiefsten Resonanzfrequenz der elastischen Aufhängung von Trommel und Bottich ist, so beträgt die Phasenverschiebung zwischen dem Maximum des Signals α0 und der Lage der Unwucht αU beispielsweise ca. -90°.
- Bei sehr hohen Winkelgeschwindigkeiten deutlich über der.stärksten Resonanzfrequenz der Aufhängung der Trommel 1 dreht sich die Phasenverschiebung um 180°, d.h. im vorliegenden Beispiel auf ca. +90°.
- At low angular velocities of the drum, ie when the angular velocity is so high that the laundry in the drum no longer falls but is pressed against the drum wall, but the speed is still well below the lowest resonance frequency of the elastic suspension of the drum and tub is so the phase shift between the maximum of Signal α0 and the position of the unbalance αU, for example, about -90 °.
- At very high angular velocities clearly above the highest resonance frequency of the suspension of the drum 1, the phase shift rotates by 180 °, ie in the present example to about + 90 °.
Ein entsprechender Verlauf der Phasenverschiebung ist in
Um aus der Phasenlage der sinusförmigen Variation der Signale der Beschleunigungs-Sensoren 7 auf die Lage der Unwucht schliessen zu können, ist in einem Speicher 25 der Steuerung 20 die Phasenverschiebung zwischen den Signalen der Beschleunigungs-Sensoren 7 und der Position der Unwucht als Funktion der Drehzahl der Trommel 1 abgespeichert. Dies kann z.B. in Form von einzelnen Werten gemäss
Zur Durchführung der Korrektur ermittelt der Mikroprozessor 24 der Steuerung 20 die Phasenlage der gemessenen Beschleunigungswerte, z.B. mittels FourierTransformation oder Cosinus-Transformation, wobei im gleichen Rechenschritt auch die Amplitude bestimmt werden kann. Zu der ermittelten Phasenlage addiert der Mikroprozessor 24 die Phasenverschiebung gemäss den Kalibrationswerten aus Speicher 25 zu dieser Drehzahl, woraus sich die Winkelposition der Unwucht ergibt. Abhängig von dieser Winkelposition können nun z.B. die Tanks 10 gefüllt werden. Hierzu gibt die Steuerung 20 an eine Ventilsteuerung 26 entsprechende Steuersignale ab.To carry out the correction, the
Anstelle von Beschleunigungs-Sensoren 7, welche achsiale und/oder radiale Beschleunigungen der Trommel 1 bzw. des schwingenden Systems messen, können auch Positionssensoren eingesetzt werden, welche die achsialen oder radialen Auslenkungen der Trommel 1, des Bottichs 3 oder anderer Teile des schwingenden Systems messen. Auch hier ist jedoch wieder die oben erwähnte Phasenkorrektur zum erzielen genauer Messungen durchzuführen.Instead of
Vorzugsweise wird zur Verarbeitung der Mittelwert der Signale der Beschleunigungs-Sensoren 7 verwendet. Dadurch wird ein von Verkippungen der Trommel unabhängiges Signal erzeugt.Preferably, the mean value of the signals of the
Die Kalibrationswerte, d.h. der Verlauf der Phasenverschiebung gemäss
Claims (10)
- Washing machine with
a drum (1) rotating about a rotation axis (2),
a measurement device (7, 8) for detecting an imbalance in the drum (1), by means of which measurement values are generated as a function of the rotation position (α) of the drum, and
a controller (20) for determining a position and/or magnitude of the imbalance from the measurement values,
characterized by a memory (23, 25) for storing calibration values, wherein the controller (20) is adapted to determine the position and/or magnitude of the imbalance by calculative recombination of the measured values with the calibration values. - Washing machine according to claim 1, characterized in that idle measurements values (t0) are stored in the memory (23, 25) as function of the rotation position (α) and in that the controller (20) is adapted to determine the position and/or the magnitude of the imbalance by calculative recombination of the measured values with the idle values.
- Washing machine according to claim 2, characterized in that the controller (20) is adapted to determine a quotient (q) of the measured values (t) and the corresponding idle values (t0).
- Washing machine according to one of the preceding claims, characterized in that a phase shift (phi) between the measurement values and the position of the imbalance is stored in the memory (23, 25) as a function of the angular speed (D) of the drum and in that the controller (20) is adapted to determine the position of the imbalance by calculative recombination of the measurement values with the phase shift (phi).
- Washing machine according to one of the preceding claims, characterized in that the controller (20) is adapted to determine at least a part of the calibration values during a calibration measurement when the drum (1) is empty.
- Washing machine according to one of the preceding claims, characterized in that the measurement device has at least an angular speed sensor (8, 21, 22) which measures the current angular speed as a function of the rotation position of the drum.
- Washing machine according to claim 6, characterized in that the angular speed sensor (8, 21, 22) has a rotating body (21) and a detector (8), wherein the rotating body (21) rotates with the drum (1) and carries a number of marks (22), and wherein the detector (8) is arranged stationarily at the rotating body (21) and detects the marks (22).
- Washing machine according to claim 7, characterized in that the detector (8) is an optical detector and the marks (22) are optically readable marks, and particularly in that the detector (8) is a light barrier with a light path which is interruptible by the marks (22).
- Washing machine according to one of the preceding claims, characterized in that the measurement device has at least an acceleration sensor (7) and/or a position sensor for measuring a radial and/or an axial acceleration or position variation of the drum (1) or of a vat (3) surrounding the drum and non-rotating and at least a part of the measurement values are acceleration signals and/or position signals.
- Washing machine according to claim 9, characterized in that at least two acceleration sensors (7) are provided at the opposed ends of the vat (3), wherein a mean value of the signals of the acceleration sensors (7) is determined.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL06011034T PL1736589T3 (en) | 2005-06-24 | 2006-05-30 | Washing machine with unbalance detector |
SI200631866T SI1736589T1 (en) | 2005-06-24 | 2006-05-30 | Washing machine with unbalance detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH10772005 | 2005-06-24 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1736589A2 EP1736589A2 (en) | 2006-12-27 |
EP1736589A3 EP1736589A3 (en) | 2009-06-17 |
EP1736589B1 true EP1736589B1 (en) | 2014-10-01 |
Family
ID=37198914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06011034.3A Active EP1736589B1 (en) | 2005-06-24 | 2006-05-30 | Washing machine with unbalance detector |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1736589B1 (en) |
DK (1) | DK1736589T3 (en) |
PL (1) | PL1736589T3 (en) |
SI (1) | SI1736589T1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008017284B4 (en) | 2008-04-04 | 2020-06-25 | BSH Hausgeräte GmbH | Washing machine with analog pressure sensor and method for its operation |
US9145634B2 (en) | 2013-06-04 | 2015-09-29 | Whirlpool Corporation | Method of operating a laundry treating appliance |
CH710592A1 (en) | 2015-01-06 | 2016-07-15 | V-Zug Ag | Washing with unbalance compensation. |
JP2017113232A (en) * | 2015-12-24 | 2017-06-29 | 青島海爾洗衣机有限公司QingDao Haier Washing Machine Co.,Ltd. | Control method of washing machine |
WO2019127459A1 (en) * | 2017-12-29 | 2019-07-04 | 陈坚胜 | Water agitating device of washing machine, and washing machine |
DE102018104018A1 (en) | 2018-02-22 | 2019-08-22 | Miele & Cie. Kg | The invention relates to an aggregate for a washing machine according to the preamble of claim 1 and a washing machine, which is equipped with such an aggregate |
EP3904581A1 (en) | 2020-04-30 | 2021-11-03 | Haier Deutschland GmbH | Laundry treatment machine and method to operate a laundry treatment machine |
JP2022010784A (en) * | 2020-06-29 | 2022-01-17 | 青島海爾洗衣机有限公司 | washing machine |
JP7503266B2 (en) * | 2020-06-29 | 2024-06-20 | 青島海爾洗衣机有限公司 | washing machine |
DE102021203780A1 (en) | 2021-04-16 | 2022-10-20 | BSH Hausgeräte GmbH | System for determining washing-mechanical data in a laundry treatment device and method for its operation |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2915815A1 (en) * | 1979-04-19 | 1980-11-06 | Bauknecht Gmbh G | DEVICE FOR DETECTING THE SPEED AND THE BALANCE OF AN AGGREGATE IN A HOUSING VIBRATINGLY |
US5280660A (en) * | 1992-10-05 | 1994-01-25 | Pellerin Milnor Corporation | Centrifugal extracting machine having balancing system |
ES2151332B1 (en) * | 1997-01-31 | 2001-06-16 | Fagor S Coop | BALANCING METHOD OF A CLOTHING WASHER. |
KR100306989B1 (en) * | 1997-03-21 | 2001-10-19 | 다카노 야스아키 | Drum type centrifugal dehydrating apparatus |
EP1391549A1 (en) * | 2001-03-28 | 2004-02-25 | Sanyo Electric Co., Ltd. | Washing machine |
-
2006
- 2006-05-30 EP EP06011034.3A patent/EP1736589B1/en active Active
- 2006-05-30 DK DK06011034.3T patent/DK1736589T3/en active
- 2006-05-30 PL PL06011034T patent/PL1736589T3/en unknown
- 2006-05-30 SI SI200631866T patent/SI1736589T1/en unknown
Also Published As
Publication number | Publication date |
---|---|
DK1736589T3 (en) | 2014-11-17 |
PL1736589T3 (en) | 2015-03-31 |
EP1736589A3 (en) | 2009-06-17 |
SI1736589T1 (en) | 2015-01-30 |
EP1736589A2 (en) | 2006-12-27 |
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