EP0898008B1 - Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners - Google Patents
Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners Download PDFInfo
- Publication number
- EP0898008B1 EP0898008B1 EP98114947A EP98114947A EP0898008B1 EP 0898008 B1 EP0898008 B1 EP 0898008B1 EP 98114947 A EP98114947 A EP 98114947A EP 98114947 A EP98114947 A EP 98114947A EP 0898008 B1 EP0898008 B1 EP 0898008B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency
- pulses
- measurement signal
- microcontroller
- laundry
- 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
- D06F34/04—Signal transfer or data transmission arrangements
-
- 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 Tumble 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 4 403 625 A describes a method for determining the loading quantity of Tumble dryers are known, in which the signal duration of the resistance measuring device is used as a measure of the load.
- 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 to a threshold circuit connected to the concern of a piece of laundry, even in dry ones State on the electrodes indicates by a hit signal of constant height delivers, which is then integrated.
- the integration of this Hit signals represent a measure of the load of the tumble dryer that is used for Control of the drying process can be used.
- the present invention is therefore based on the object of a method for determination the loading amount of tumble dryers of the type mentioned in the beginning to improve that the measure of laundry loading with digital building blocks simple is to be further processed, and also a more reliable determination of the loading quantity very little conductive laundry items is made possible.
- the frequency of the pulses of the measurement signal of the electrical conductivity of the laundry determined and used as a measure of the load.
- edges of the conductance measurement signal are advantageously detected, in particular by forming a time derivative (differentiation) and by determining it Frequency determines the frequency of the pulses of the conductance measurement signal.
- the pulses of the conductance measurement signal compared with a threshold value and by counting the pulses from a certain Threshold per unit of time, the frequency of the pulses is determined that the Exceed or fall below the threshold. Because the comparison with a threshold particularly easy by using a comparator or a Schmidt trigger can be implemented in terms of circuit technology, the invention in this way particularly can be used easily and inexpensively.
- the frequency of this Impulse determined and used as a measure of the amount of loading.
- Triggering pulses of constant duration will make the occurrence extremely short or extreme long pulses avoided with a limited temporal responsiveness of the subsequent components make it difficult to reliably determine the load.
- the determination of the frequency of the pulses of the Conductivity measurement signal carried out by means of a microcontroller, the frequency determination enabled with a low component cost and as a rule central Control device of the dryer directly via the necessary information on the load quantity can dispose of.
- each of the aforementioned steps can advantageously be carried out in the course of the processing of the conductance measurement signal for determining the frequency of its pulses also in one digital electronic computer or a microcontroller can be implemented. Because a function is carried out in an already existing microcontroller will always result in a saving that would otherwise have to be carried out Function necessary device and thus a lower component and circuit complexity, which also leads to a lower probability of failure of the dryer leads.
- the determination of the frequency of the pulses of the conductance measurement signal but also the determination of all others as a measure of the loading quantity serving frequencies performed particularly advantageously with a microcontroller become.
- the frequency measurement, whatever impulses or events, can be with a microcontroller with very little circuitry and very high accuracy Carry out, as opposed to analog circuits, digital signals can process particularly advantageously.
- the comparison of the conductance measurement signal with a predetermined one can be particularly advantageous Carry out the threshold with a microcontroller. This can be done using the microcontroller assigned or implemented in it analog / digital converter can be used or a special input of the microcontroller, such as an input with Schmidt trigger or comparator that can perform this comparison function.
- this must be analog Process signals only with an intermediate analog / digital converter is possible.
- the latter can be assigned externally to the microcontroller or also in be integrated.
- an assigned analog / digital converter can be processed by both analog and also digital signals all previously mentioned methods are carried out, so that in a tumble dryer also use several of the aforementioned methods can come.
- FIG. 1 shows a schematic circuit structure to carry out an embodiment of the method according to the invention.
- the drum 1 has an electrode 12, wherein as second electrode serves the drum 1 itself.
- the drum 1 is connected to the mass 5 of the dryer and the electrode 12 connected to a constant voltage 6 via a series resistor 13.
- the laundry in the drum 1 has a laundry resistance 14, on the one hand over the drum 1 with the mass 5 of the dryer and on the other hand via the electrode 12 with the Resistor 13 is connected and thus forms a voltage divider with this.
- a measurement signal 15 is obtained which serves as a measure of the laundry conductance.
- This Conductivity measurement signal is connected to the input of a differentiator 2, the one Output signal 21 generated.
- This output signal 21 of the differentiator 2 is in turn connected to the input of a monostable multivibrator 3, the Output signal 31 finally connected to an input of a microcontroller 4 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 any change in that measured between the electrode 12 and the drum 1 Laundry resistance 14, the conductance measurement signal 15 jumps or have an impulse. The number of these pulses per unit of time is therefore a measure of the load of the dryer. Because the conductance measurement signal is very irregular and determining the frequency of the pulses is difficult, this signal must be suitable be processed. For this purpose, the slope of the pulses is determined using a differentiator 2 of the conductance measurement signal 15 is determined and thus detected by their edges.
- each of the detected edges which are contained in the output signal 21 of the differentiator 2 are, triggers a pulse of constant duration by means of a monostable multivibrator 3.
- the output signal 31 of the monostable multivibrator 3, which the pulses more constant Duration is connected to a digital input of a microcontroller 4.
- the Microcontroller 4 counts the pulses of signal 31 received per unit of time and determines them so their frequency, which is a direct measure of the load quantity.
- the solution according to the invention thus becomes a method for determining the loading quantity created a dryer with which the measure of the load is available in digital form. This makes it easier to process through digital Building blocks, especially by a microcontroller, and a more precise determination the load quantity possible.
- a microcontroller for control of the drying process, it is possible in this way that directly in the microcontroller the necessary information on the load quantity is available.
Description
Claims (11)
- Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners, bei dem die Wäsche in einer Trommel bewegt wird, der elektrische Leitwert der Wäsche mittels Elektroden bestimmt wird, die die Wäsche zumindest zeitweise berühren, und das Meßsignal des elektrischen Leitwertes Impulse aufweist, dadurch gekennzeichnet, daß die Frequenz der Impulse des Meßsignals (15) des elektrischen Leitwertes bestimmt wird und als Maß für die Beladungsmenge dient.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß eine Erfassung der Flanken des Leitwertmeßsignals, insbesondere durch Bildung einer zeitlichen Ableitung (Differenzierung), durchgeführt wird und deren Frequenz als Maß für die Beladungsmenge dient.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Impulse des Leitwertmeßsignal mit einem Schwellenwert verglichen werden, und die Frequenz der Impulse bestimmt wird, die den Schwellenwert über- oder unterschreiten.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die erfaßten Flanken jeweils einen Impuls konstanter Dauer auslösen, und die Frequenz dieser Impulse als Maß für die Beladungsmenge dient.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß bei Über- oder Unterschreiten der vorbestimmten Schwelle jeweils ein Impuls konstanter Dauer ausgelöst wird, und die Frequenz dieser Impulse als Maß für die Beladungsmenge dient.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Bestimmung der Frequenz mittels eines Mikrocontrollers (4) durchgeführt wird.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Erfassung der Flanken des Leitwertmeßsignals und/oder die Bestimmung der Frequenz der erfaßten Flanken mittels eines Mikrocontrollers (4) durchgeführt wird.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß der Vergleich der Impulse des Leitwertmeßsignals mit einem Schwellenwert und/oder die Bestimmung der Frequenz der Impulse, die den Schwellenwert über- oder unterschreiten, mittels eines Mikrocontrollers (4) durchgeführt wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Erfassung der Flanken des Leitwertmeßsignals und/oder das Auslösen von jeweils einem Impuls konstanter Dauer und/oder die Bestimmung der Frequenz der Impulse konstanter Dauer mittels eines Mikrocontrollers (4) durchgeführt wird.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß der Vergleich des Leitwertmeßsignals mit einem Schwellenwert und/oder das Auslösen eines Impulses konstanter Dauer bei Über- oder Unterschreitung und/oder die Bestimmung der Frequenz der Impulse konstanter Dauer mittels eines Mikrocontrollers (4) durchgeführt wird.
- Verfahren nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, daß dem Mikrocontroller (4) ein Analog/Digital-Wandler zugeordnet ist, der in dem Verfahren auftretende analoge Signale verarbeitet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19736422 | 1997-08-21 | ||
DE19736422A DE19736422A1 (de) | 1997-08-21 | 1997-08-21 | Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0898008A1 EP0898008A1 (de) | 1999-02-24 |
EP0898008B1 true EP0898008B1 (de) | 2002-06-26 |
Family
ID=7839743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98114947A Expired - Lifetime EP0898008B1 (de) | 1997-08-21 | 1998-08-07 | Verfahren zur Bestimmung der Beladungsmenge eines Wäschetrockners |
Country Status (3)
Country | Link |
---|---|
US (1) | US6466037B1 (de) |
EP (1) | EP0898008B1 (de) |
DE (2) | DE19736422A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19960310A1 (de) * | 1999-12-14 | 2001-06-28 | Bsh Bosch Siemens Hausgeraete | Vorrichtung und Verfahren zur Messung der Beladung in einem Wäschebehandlungsgerät |
DE10200975C2 (de) * | 2001-03-02 | 2003-08-28 | Whirlpool Co | Verfahren zum Verändern des Programmablaufes bei einem Haushaltswäschetrockner |
KR100480725B1 (ko) * | 2002-11-26 | 2005-04-07 | 엘지전자 주식회사 | 건조기의 포량감지장치 |
KR100480929B1 (ko) * | 2003-08-12 | 2005-04-07 | 엘지전자 주식회사 | 의류건조기의 건조 제어방법 |
CA2505565C (en) * | 2005-04-28 | 2008-09-16 | Camco Inc. | Apparatus and method for controlling a clothes dryer |
DE602007011731D1 (de) * | 2007-04-30 | 2011-02-17 | Electrolux Home Prod Corp | Verfahren zum Steuern eines Trommelwäschetrockners |
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 |
DE102008041265A1 (de) * | 2008-08-14 | 2010-02-18 | BSH Bosch und Siemens Hausgeräte GmbH | Kondensationstrockner mit einer Wärmepumpe und Erkennung eines unzulässigen Betriebszustands |
US8578627B2 (en) | 2010-10-21 | 2013-11-12 | Whirlpool Corporation | Method and apparatus for moisture sensor noise immunity |
JP5974290B2 (ja) * | 2012-09-19 | 2016-08-23 | パナソニックIpマネジメント株式会社 | ドラム式洗濯乾燥機 |
JP5974291B2 (ja) * | 2012-09-19 | 2016-08-23 | パナソニックIpマネジメント株式会社 | 衣類乾燥機 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4403625A1 (de) * | 1994-02-05 | 1995-08-10 | Miele & Cie | Wäschetrockner mit einer Vorrichtung zur Ermittlung der Beladungsmenge |
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 |
DE3171805D1 (en) * | 1981-06-19 | 1985-09-19 | Verzinkerei Zug Ag | Method of drying laundry and machine for carrying out the method |
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 |
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 DE19736422A patent/DE19736422A1/de not_active Withdrawn
-
1998
- 1998-08-07 EP EP98114947A patent/EP0898008B1/de not_active Expired - Lifetime
- 1998-08-07 DE DE59804563T patent/DE59804563D1/de not_active Expired - Fee Related
- 1998-08-21 US US09/138,348 patent/US6466037B1/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4403625A1 (de) * | 1994-02-05 | 1995-08-10 | Miele & Cie | Wäschetrockner mit einer Vorrichtung zur Ermittlung der Beladungsmenge |
Also Published As
Publication number | Publication date |
---|---|
DE19736422A1 (de) | 1999-02-25 |
DE59804563D1 (de) | 2002-08-01 |
EP0898008A1 (de) | 1999-02-24 |
US6466037B1 (en) | 2002-10-15 |
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