EP0898009B1 - Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners - Google Patents
Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners Download PDFInfo
- Publication number
- EP0898009B1 EP0898009B1 EP98114948A EP98114948A EP0898009B1 EP 0898009 B1 EP0898009 B1 EP 0898009B1 EP 98114948 A EP98114948 A EP 98114948A EP 98114948 A EP98114948 A EP 98114948A EP 0898009 B1 EP0898009 B1 EP 0898009B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductance
- fluctuation range
- laundry
- determined
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- 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
- D06F2103/02—Characteristics of laundry or load
-
- 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
- D06F2103/02—Characteristics of laundry or load
- D06F2103/08—Humidity
- D06F2103/10—Humidity expressed as capacitance or resistance
-
- 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
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
- D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
Definitions
- the present invention relates to a method for determining the amount of loading a clothes dryer according to the preamble of claim 1.
- the drying process plays alongside the moisture and the type of laundry that is usual is dried in a drum, including the load the dryer plays a big role. Therefore, for various reasons, it is about for accurate remaining time prediction, for optimal control of the drying process or for customized heating output, advantageous, the load to determine the dryer.
- Methods for determining the amount of loading of are from the prior art Washer dryers known, which are based on the evaluation of temperature or temperature gradient measurements, on the current draw of the motor to move the laundry drum or based on a measurement of the electrical capacity of the drum.
- DE 29 45 696 A1 describes a method for determining the amount of loading known from tumble dryers, in which the electrical conductivity of the laundry is used becomes.
- two electrodes are attached in the drum, which temporarily touch the laundry when the drum is rotated and by means of which determines the electrical conductivity.
- This master value signal which with the Movement of laundry in the drum varies and has impulses, is at one Threshold switch connected, which concerns the concern of a piece of laundry itself in a dry state on the electrodes by making a hit signal more constant Returns height, which is then integrated.
- the more often and the longer a piece of laundry at the electrodes the more frequent and longer the hit signals and the higher the value of the integration of these hit signals.
- integration poses of these hit signals is a measure of the load of the dryer, which can be used to control the drying process.
- DE 4 403 625 A1 discloses a method in which the duration of the signal emitted by the resistance measuring device for Determination of the load quantity is used.
- the threshold value formation with subsequent integration of the hit signals requires one high component and circuit complexity, which is uneconomical and the risk of failure elevated. Furthermore, this method only works if the conductance is at a very high level low value falls, which is still below that which corresponds to the conductivity of dry laundry, so that even minor disturbances in the conductance measurement lead to a faulty one Determine the load quantity. As to the function of this method the certain Conductivity, at least at times, has to assume very low values higher load, where there is always a piece of laundry on the electrodes, not an exact one It is now possible to determine the load quantity.
- the present invention is therefore based on the object of a method for determination the load of tumble dryers of the type mentioned to be improved in such a way that it can be carried out with little expenditure on components and circuitry is highly insensitive to interference and even at higher loads enables reliable determination of the load.
- the fluctuation range of the electrical light value is for this purpose determined and used as a measure of the load.
- the tumble dryer is very likely to be on the electrode there is no item of laundry so that there is a large fluctuation range in the conductance established.
- the greater the load the less likely it is that there is no laundry on the electrode and the less the fluctuation range of the conductance.
- This method enables the amount of loading to be determined with little or completely without additional components and circuitry, since it is based on a conductance measurement based in most tumble dryers to determine laundry moisture is implemented anyway. Furthermore, this method enables even with higher loads an exact determination of the loading quantity, since every change of the determined Conductivity is detected without falling below a certain threshold got to. This also results in greater insensitivity to interference.
- the difference between the maximum and determined the minimum value of the master value within a certain time interval By restricting the determination of the fluctuation range to a time interval the frequency of the fluctuation width values determined can be varied by varying the time interval influence and by increasing the duration of the time interval Reduce the influence of short-term disturbances.
- the conductance is advantageously measured at periodic intervals and the Fluctuation range of the individual conductance measurements determined.
- By winning Discrete guide values can easily determine and evaluate the fluctuation range done with digital components.
- by choosing the measurement period the frequency of the determined guide values and thus the computing effort required for evaluation freely determine depending on the requirements and possibilities.
- the maximum and minimum values of the conductance are advantageously averaged and the range of fluctuation in each case determines the mean values. Through this averaging the influence of short-term disturbances is reduced and the measuring certainty of the determination of the load increased. In addition, it is also possible to find implausible ones Suppress values such as outliers and disregard them when averaging.
- the ones obtained Average fluctuation ranges and the fluctuation range mean as a measure of the Load to use. This can reduce the influence of short-term disturbances and the measuring certainty can be increased. In addition, it is also possible here, not plausible recognizing appearing values, such as outliers, and not taking them into account when averaging.
- FIG. 1 Therein is a schematic circuit structure for performing one Embodiment of the method according to the invention shown.
- the drum 1 has an electrode 12, wherein the drum 1 itself serves as the second electrode.
- the drum 1 is connected to the mass 4 of the dryer and the electrode 12 connected to a constant voltage 5 via a series resistor 13.
- the Laundry in the drum 1 has a laundry resistance 14, on the one hand, via the Drum 1 with the mass 4 of the dryer and on the other hand via the electrode 12 is connected to the resistor 13 and therefore with this one voltage divider forms.
- a measurement signal 15 is obtained, which is a measure of the laundry conductance serves.
- This conductance measurement signal is connected to the input of an anti-aliasing low-pass filter 2 connected, the output of which is connected to an analog input of a microcontroller 3 is.
- the load of the tumble dryer is determined when moving the laundry in the drum 1 by rotating it.
- the laundry gets at least at times in contact with the electrode 12, which is a time-varying conductivity measurement signal 15 results. Every time the electrode 12 is touched by a piece of laundry or each time the electrode 12 and drum 1 change measured laundry resistance 14, the conductance measurement signal 15 jumps or have an impulse. In cases where no laundry touches the electrode 12, or a piece of laundry touches the electrode very little, and therefore less If the conductance is determined, the conductance measurement signal has a minimum value. at very good electrical connection between the electrode 12 and the laundry is against it the signal 15 have a maximum value.
- This master value signal is by means of of a microcontroller 3, being used to prevent incorrect measurements Anti-aliasing filter 2 is interposed.
- the microcontroller 3 now measures periodically Distances the conductance and determined by forming the difference between one Maximum and a minimum value of the master value within a certain time interval the fluctuation range.
- the microcontroller can use the fluctuation range of the electrical conductivity determine the load of the tumble dryer.
- the solution according to the invention thus becomes a method for determining the loading quantity of a tumble dryer created with the avoidance of a high Component and circuit expenditure an exact determination even with higher loads the amount of loading is possible and high insensitivity to Disturbances can be achieved.
- This method can be used particularly advantageously in tumble dryers use in which a microcontroller is used anyway and a conductance measurement the laundry is carried out.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
Description
Claims (7)
- Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners, bei dem die Wäsche in einer Trommel (1) bewegt wird, und der elektrische Leitwert der Wäsche mittels Elektroden (12, 1) bestimmt wird, die die Wäsche zumindest zeitweise berühren, dadurch gekennzeichnet, daß die Schwankungsbreite des elektrischen Leitwertes bestimmt wird und als Maß für die Beladungsmenge dient.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Schwankungsbreite die Differenz zwischen dem Maximal- und dem Minimalwert des Leitwertes innerhalb eines bestimmten Zeitintervalls bestimmt wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Leitwert in periodischen Abständen gemessen wird und die Schwankungsbreite der einzelnen Leitwertmessungen bestimmt wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Maximalund die Minimalwerte des Leitwertes gemittelt werden und die Schwankungsbreite jeweils der Mittelwerte bestimmt wird.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Schwankungsbreite des elektrischen Leitwertes mehrmals bestimmt wird, die erhaltenen Schwankungsbreiten gemittelt werden und der Schwankungsbreitenmittelwert als Maß für die Beladung dient.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Bestimmung der Schwankungsbreite des Leitwertes im wesentlichen ab Beginn des Trocknungsvorganges durchgeführt wird und vorzugsweise nur über eine relativ kurze Zeitdauer erfolgt.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß zur Bestimmung der Schwankungsbreite des Leitwertes ein Mikrocontroller (3) mit zugeordnetem Analog/Digital-Wandler verwendet wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19736419A DE19736419A1 (de) | 1997-08-21 | 1997-08-21 | Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners |
DE19736419 | 1997-08-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0898009A1 EP0898009A1 (de) | 1999-02-24 |
EP0898009B1 true EP0898009B1 (de) | 2002-05-15 |
Family
ID=7839740
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98114948A Expired - Lifetime EP0898009B1 (de) | 1997-08-21 | 1998-08-07 | Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners |
Country Status (3)
Country | Link |
---|---|
US (1) | US6462564B1 (de) |
EP (1) | EP0898009B1 (de) |
DE (2) | DE19736419A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2730694A1 (de) | 2012-11-13 | 2014-05-14 | BSH Bosch und Siemens Hausgeräte GmbH | Verfahren zum Ermitteln zumindest einer Kenngröße von Wäschestücken, sowie entsprechende Wäschepflegemaschine |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1236826A3 (de) * | 2001-03-02 | 2003-10-01 | Whirlpool Corporation | Verfahren zur Veränderung des Programms in einem Haushalttrockner |
DE10143664C1 (de) * | 2001-09-06 | 2003-02-20 | Whirlpool Corp Benton Harbor | Verfahren zur Programmgestaltung des Behandlungsablaufes, insbesondere Trocknungsablaufes, in Textilbehandlungsgeräten, wie Waschmaschinen, Wäschetrockner, Wäscheschleudern u. dgl. |
CA2505565C (en) * | 2005-04-28 | 2008-09-16 | Camco Inc. | Apparatus and method for controlling a clothes dryer |
KR101253181B1 (ko) * | 2006-12-26 | 2013-04-10 | 엘지전자 주식회사 | 건조기 및 그 제어방법 |
CA2629495A1 (en) * | 2008-04-18 | 2009-10-18 | Mabe Canada Inc. | Apparatus for controlling a clothes dryer |
DE102008025496A1 (de) * | 2008-05-28 | 2009-12-03 | BSH Bosch und Siemens Hausgeräte GmbH | Messanordnung zur Ermittlung einer Information über die Beladung eines Wäschetrockners |
DE102012221919A1 (de) | 2012-11-29 | 2014-06-05 | BSH Bosch und Siemens Hausgeräte GmbH | Haushaltsgerät mit einem beleuchtbaren Behandlungsraum |
EP2927363B1 (de) * | 2014-03-31 | 2019-06-12 | Electrolux Appliances Aktiebolag | Verfahren zum durchführen eines trocknungszyklus in einer wäschebehandlungsmaschine, wäschebehandlungsvorrichtung und elektronische steuereinheit |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2945696C2 (de) * | 1979-11-13 | 1982-12-30 | Ako-Werke Gmbh & Co., 7988 Wangen | Schaltungsanordnung zur Steuerung eines Wäschetrockners |
US4422247A (en) * | 1981-06-29 | 1983-12-27 | Whirlpool Corporation | Low voltage sensor for a dryer |
US4738034A (en) * | 1985-12-16 | 1988-04-19 | Kabushiki Kaisha Toshiba | Drying machine |
DE4403625C2 (de) * | 1994-02-05 | 2003-08-07 | Miele & Cie | Wäschetrockner mit einer Vorrichtung zur Ermittlung des Füllgrades in der Trommel |
US5450015A (en) * | 1994-02-24 | 1995-09-12 | Forte Technology, Inc. | Apparatus for measuring impedance to determine a property of a material |
US5514973A (en) * | 1994-07-11 | 1996-05-07 | The United States Of America As Represented By The Secretary Of Agriculture | System for analyzing moisture content of materials such as cotton |
-
1997
- 1997-08-21 DE DE19736419A patent/DE19736419A1/de not_active Withdrawn
-
1998
- 1998-08-07 DE DE59804119T patent/DE59804119D1/de not_active Expired - Fee Related
- 1998-08-07 EP EP98114948A patent/EP0898009B1/de not_active Expired - Lifetime
- 1998-08-21 US US09/138,352 patent/US6462564B1/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2730694A1 (de) | 2012-11-13 | 2014-05-14 | BSH Bosch und Siemens Hausgeräte GmbH | Verfahren zum Ermitteln zumindest einer Kenngröße von Wäschestücken, sowie entsprechende Wäschepflegemaschine |
Also Published As
Publication number | Publication date |
---|---|
DE19736419A1 (de) | 1999-02-25 |
US6462564B1 (en) | 2002-10-08 |
DE59804119D1 (de) | 2002-06-20 |
EP0898009A1 (de) | 1999-02-24 |
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