EP1816253A2 - Verfahren und Vorrichtung zur Erkennung der Fehlfunktion des Trommel-Antriebssystems eines Wäschetrockners - Google Patents

Verfahren und Vorrichtung zur Erkennung der Fehlfunktion des Trommel-Antriebssystems eines Wäschetrockners Download PDF

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Publication number
EP1816253A2
EP1816253A2 EP06100754A EP06100754A EP1816253A2 EP 1816253 A2 EP1816253 A2 EP 1816253A2 EP 06100754 A EP06100754 A EP 06100754A EP 06100754 A EP06100754 A EP 06100754A EP 1816253 A2 EP1816253 A2 EP 1816253A2
Authority
EP
European Patent Office
Prior art keywords
clothes
signal
tumbling
dryer
conductivity
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.)
Granted
Application number
EP06100754A
Other languages
English (en)
French (fr)
Other versions
EP1816253B1 (de
EP1816253A3 (de
Inventor
Cristiano Pastore
Francesco Jatta
Ralf Haselmeier
Thomas Lorenz
Gabriele Papi
Rocco Petrigliano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whirlpool Corp
Original Assignee
Whirlpool Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to ES06100754T priority Critical patent/ES2317414T3/es
Priority to AT06100754T priority patent/ATE412796T1/de
Priority to EP06100754A priority patent/EP1816253B1/de
Priority to DE602006003405T priority patent/DE602006003405D1/de
Priority to PL06100754T priority patent/PL1816253T3/pl
Publication of EP1816253A2 publication Critical patent/EP1816253A2/de
Publication of EP1816253A3 publication Critical patent/EP1816253A3/de
Application granted granted Critical
Publication of EP1816253B1 publication Critical patent/EP1816253B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers
    • 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
    • D06F2103/06—Type or material
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/24—Spin speed; Drum movements
    • 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
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • D06F2103/52—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to electric heating means, e.g. temperature or voltage
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • 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
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D06F58/04—Details 
    • D06F58/08—Driving 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
    • 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 detecting the breakage of the transmission system providing rotating force to the drum of a tumble dryer. More particularly, the present invention relates to a method for monitoring failure of said transmission system in a dryer having a conductivity sensor for assessing electrical resistance across electrodes being touched by tumbling clothes.
  • the present invention relates also to a clothes dryer that performs the above method.
  • the drum rotating system of a clothes dryer comprises a motor and a belt.
  • the breakage of the belt is a dangerous event, potentially leading to a fire risk if such condition is not detected.
  • the root cause of the fire risk associated with the failure of the drum motion is the persistence of the same piece of clothes against the hot air inlet of the dryer.
  • the present invention can be used in those dryers equipped with moisture sensors based on analogue resistance measuring systems, as those disclosed in EP-A-940494 .
  • electromechanical devices are expensive and sometime unreliable as they imply the use of additional moving part, holding systems and harness.
  • Such electromechanical switches are usually electrically connected in series with the heating elements of the dryer for triggering, in case of belt rupture, the immediate interruption of heat generation inside the machine.
  • Those methods are able to detect just the breakage of the transmission belt, not being able to reliably detect also a belt loosening or failures of the motor.
  • An object of the present invention is to provide a detection method and system which does not cause an increase of the overall cost of the dryer and is able to identify and give a signal indicative of the absence of drum motion, caused by a failure in the motor and/or in the transmission system.
  • the invention is applicable in the dryers equipped with conductivity strips circuits (originally used for moisture detection) of the type providing a continuos (i.e. analogue) signal, proportional to the instantaneous electrical impedance offered by the clothes touching the strips.
  • This well-known type of sensor relies usually on two electrodes, placed inside the machine cavity in such position to be subjected to the mechanical contact with the tumbling clothes.
  • the electrodes may either made of a couple of metal strips located in proximity of the drum rim but not rotating with the drum itself (i.e. integral with the machine chassis) or directly placed on the drum and then connected to the electronic circuitry trough sliding contacts.
  • These sensors are offered by most of the dryer manufacturer in the high-end segment of the market and allow a better monitoring of the drying state by actually reading the residual water content in the fabric that is known to be proportional to the conductivity with a known relationship.
  • An advantage of those continuous conductivity sensors vs. those just providing voltage pulses upon touching of a cloth sufficiently wet lies in the possibility to have increased moisture detection accuracy. This is due to the extended range of resistance measurement typically spanning from 50k ⁇ to 50M ⁇ as opposed to ability of "wet hit" sensor to just discriminate if the instantaneous resistance is above or below a given threshold (typically fixed around 1 M ⁇ ).
  • said analogue conductivity signal is typically converted into a frequency or pulse width signal and the optically isolated before being fed into a digital counter of the control unit.
  • PWM pulse width modulation
  • the continuous clothes impedance signal is converted into a digital sequence, this is usually processed in known manner by the control unit in order to determine the dryness state of the clothes.
  • the present invention aims at using the same continuous conductivity signal in order to assess the absence of drum motion, with high reliability over the whole drying cycle. Since the same conductivity signal is used also for another purpose, the overall cost of the system according to the invention is very low, being included in an updated software embedded in the microprocessor of the control process unit.
  • Another object of the present invention is to use said signal of absence of drum motion to trigger a safety program in the machine control unit aimed at placing the appliance in safe conditions.
  • Another object of the present invention is to minimise the occurrence of false alarms (i.e. undue generation of the signal of absence of drum motion) and simultaneously minimise the probability of missed alarms (e.g. missed generation of the signal of absence of drum motion in case of a real failure), even in presence of heavy electrical noises superimposed to the moisture sensor signal and/or in case of external shaking of the dryer caused - for example - by a washing machine stacked below the dryer.
  • Another object of the present invention is the ability to perform the detection of the drum motion system even in conditions usually not reliably identifiable by existing prior art based on digital clothes touch system, like heavily loaded machine with very wet items or when the load is getting so dry to be unable to trigger the so called "wet hit" sensor.
  • a method for processing said analogue resistance signal output by a known continuos conductivity sensor based on electrodes is disclosed, in order to detect the state of motion of the drum, by analysing the frequency content of the signal and outputting a "motor still” or “drum still” signal if such signal doesn't contain sufficient energy at those frequency typically excited by the process clothes tumbling.
  • a clothes dryer 10 comprises a drum 12, a motor 14 with a pulley 16 and a transmission belt 18 around the pulley 16 and the drum 12.
  • the invention is based on the observation that the frequency spectra of the continuous conductivity signal provided by the electrodes contacted by the tumbling clothes in the drum 12 may be substantially described by four frequency components graphically shown in figure 2:
  • the signal is always affected by a number of disturbing component or noises, typically:
  • the invention is also based on the fact that the conditions for fabric damage or fabric ignition are function of a combination of the factors temperature, time and humidity content.
  • the applicant has discovered by empirical methods the set of time/temperature/humidity that defines the boundary of fabric damage and fabric ignition. An example of such physical relationship is shown in figure 3.
  • the present invention achieves the object of robust and reliable detection of absence of drum motion by processing the signal in the frequency domain in order to retain the frequency spectra of the clothes tumbling process while rejecting the frequency spectra of the noise sources.
  • Said signal processing in the frequency domain is therefore carried out in order to extract the energy associated only with the frequency bands being excited by the clothes tumbling process. It is not necessary to disclose in details how the above signal processing in the frequency domain is carried out, since this is well known to the man skilled in the art of appliance control.
  • the extraction of the frequency band stimulated by the clothes tumbling is done for instance by calculating the discrete Fourier transform of the time sampled analogue conductivity at the frequencies of interest (typically 0.5Hz to 6 Hz) and then averaging the magnitude of these spectral lines.
  • the extraction of the frequency band stimulated by the clothes tumbling is done by fast Fourier transforming the analogue signal and then grouping and averaging the spectral lines corresponding to the above frequencies of interest.
  • the extraction of the frequency band stimulated by the tumbling clothes is done by implementing a band-pass filter - either in analogue or discrete-time form - whose pass-band is substantially overlapped to the above frequencies of interest.
  • the above signal can be already used by a control process unit 20 of the dryer 10 by comparing it to a threshold value in order to detect a failure of the drum transmission system.
  • a threshold value can be set as a fraction of the average value of the above motion signal in normal operating conditions.
  • Such motion threshold can be dynamically and continuously set as a fraction of the motion signal continuously averaged during the drying process.
  • the control process unit 20 comprises a resistance to voltage converter 20a, a frequency domain processor 20b, a safety state machine processor 20c, a humidity estimator 20d and a risk supervisor processor 20e.
  • the signal coming from the resistance to voltage converter 20a is fed to the humidity estimator 20d and to the frequency domain processor 20b.
  • the safety state machine processor 20c is fed with signals coming from the frequency domain processor 20b and by the risk supervisor 20e.
  • This latter processes not only data on humidity coming from the block 20d, but also signal h, k and z coming from other components of the dryer and indicative of the heat power delivered by the heaters, of the fabric type and of the process air temperature. Therefore the main signal coming from the frequency domain processor 20b, signal which reflects the actual motion state of the drum, is somehow "adjusted" in the block 20c in order to take into account other signals useful to update the actual degree of risk.
  • a subsequent step of the control method is preferably used to further process said instantaneous amount of motion signal over a given time observation window in order to understand if the lack of signal is just temporarily due to extreme unfavourable conditions - as loads close to almost complete dryness, or the amount of load is such to have low probability to fall on the strips causing absence of signal- or is actually due to a motor or transmission failure.
  • a further preferred step of the method is to trigger a first safety state in the machine control unit 20 upon the condition that the amount of motion signal stayed below the given motion threshold for a time longer than a given observation time-window, being said first safety state a reversible state, reverting to normal drying state upon detection that the amount of motion signal has remained above a given threshold for a given amount of time.
  • the control unit may be conveniently programmed to turn off the heating elements or to reduce the associated power to a safe value.
  • the reliability of the method is further increased by making the time observation window for said further processing depending on the output of a fire risk assessment algorithm (processed in the risk supervisor 20e) that takes into account the instantaneous state of the machine (i.e. power delivered to the heating elements, dryness state of the load, process air temperature etc.), allowing longer reaction times (i.e. longer observation time-windows) in case of low risk and forcing shorter reaction time in case of critical conditions.
  • a fire risk assessment algorithm processingd in the risk supervisor 20e
  • Such observation time-window can be changed during the drying process in a way proportional to residual humidity of clothes and inversely proportional to the average power delivered to heaters.
  • Another preferred step of the present invention is to check the motion detection signal when the machine is in the first reversible safety status and if this signal exceeds the motion thresholds again the dryer will be turned back in the nominal operations unless a certain time limit has passed since the first entrance in the safety state. If this said time limit has passed the first safety state becomes irreversible until the end of the cycle and the machine cannot reach the nominal operations anymore.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Drying Of Solid Materials (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP06100754A 2006-01-24 2006-01-24 Verfahren und Vorrichtung zur Erkennung der Fehlfunktion des Trommel-Antriebssystems eines Wäschetrockners Not-in-force EP1816253B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ES06100754T ES2317414T3 (es) 2006-01-24 2006-01-24 Un metodo y un dispositivo para detectar el fallo del sistema de accionamiento del tambor de una secadora de ropa.
AT06100754T ATE412796T1 (de) 2006-01-24 2006-01-24 Verfahren und vorrichtung zur erkennung der fehlfunktion des trommel-antriebssystems eines wäschetrockners
EP06100754A EP1816253B1 (de) 2006-01-24 2006-01-24 Verfahren und Vorrichtung zur Erkennung der Fehlfunktion des Trommel-Antriebssystems eines Wäschetrockners
DE602006003405T DE602006003405D1 (de) 2006-01-24 2006-01-24 Verfahren und Vorrichtung zur Erkennung der Fehlfunktion des Trommel-Antriebssystems eines Wäschetrockners
PL06100754T PL1816253T3 (pl) 2006-01-24 2006-01-24 Sposób i urządzenie do wykrywania awarii układu napędowego bębna suszarki bębnowej do ubrań

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06100754A EP1816253B1 (de) 2006-01-24 2006-01-24 Verfahren und Vorrichtung zur Erkennung der Fehlfunktion des Trommel-Antriebssystems eines Wäschetrockners

Publications (3)

Publication Number Publication Date
EP1816253A2 true EP1816253A2 (de) 2007-08-08
EP1816253A3 EP1816253A3 (de) 2007-09-05
EP1816253B1 EP1816253B1 (de) 2008-10-29

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ID=38179601

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Application Number Title Priority Date Filing Date
EP06100754A Not-in-force EP1816253B1 (de) 2006-01-24 2006-01-24 Verfahren und Vorrichtung zur Erkennung der Fehlfunktion des Trommel-Antriebssystems eines Wäschetrockners

Country Status (5)

Country Link
EP (1) EP1816253B1 (de)
AT (1) ATE412796T1 (de)
DE (1) DE602006003405D1 (de)
ES (1) ES2317414T3 (de)
PL (1) PL1816253T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010063554A1 (de) * 2008-12-03 2010-06-10 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät mit einer messeinheit und verfahren zum übertragen einer messgrösse
US20150322611A1 (en) * 2009-08-10 2015-11-12 Whirlpool Corporation Laundry treating appliance with tumble pattern control
DE102017219053A1 (de) * 2017-10-25 2019-04-25 BSH Hausgeräte GmbH Verfahren zur Bestimmung von Wäscheeigenschaften in einem Wäschetrockner und hierfür geeigneter Wäschetrockner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8578627B2 (en) 2010-10-21 2013-11-12 Whirlpool Corporation Method and apparatus for moisture sensor noise immunity

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758959A (en) * 1971-11-12 1973-09-18 Whirlpool Co Dryer control system using moisture sensor and semiconductors to control cycle
GB2068099A (en) * 1980-01-28 1981-08-05 Philips Electronic Associated Control device for laundry drier
EP0549467A1 (de) * 1991-12-23 1993-06-30 Crouzet Appliance Controls Steuersystem zum Anhalten eines Wäschetrockners
US6326758B1 (en) * 1999-12-15 2001-12-04 Reliance Electric Technologies, Llc Integrated diagnostics and control systems
US20050016013A1 (en) * 2003-07-25 2005-01-27 Bang Jong Chul Control method and system for clothes dryer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758959A (en) * 1971-11-12 1973-09-18 Whirlpool Co Dryer control system using moisture sensor and semiconductors to control cycle
GB2068099A (en) * 1980-01-28 1981-08-05 Philips Electronic Associated Control device for laundry drier
EP0549467A1 (de) * 1991-12-23 1993-06-30 Crouzet Appliance Controls Steuersystem zum Anhalten eines Wäschetrockners
US6326758B1 (en) * 1999-12-15 2001-12-04 Reliance Electric Technologies, Llc Integrated diagnostics and control systems
US20050016013A1 (en) * 2003-07-25 2005-01-27 Bang Jong Chul Control method and system for clothes dryer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010063554A1 (de) * 2008-12-03 2010-06-10 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät mit einer messeinheit und verfahren zum übertragen einer messgrösse
CN102239291B (zh) * 2008-12-03 2013-01-23 Bsh博世和西门子家用电器有限公司 包括测量单元的家用电器以及用于传输测量变量的方法
US20150322611A1 (en) * 2009-08-10 2015-11-12 Whirlpool Corporation Laundry treating appliance with tumble pattern control
US9957653B2 (en) * 2009-08-10 2018-05-01 Whirlpool Corporation Laundry treating appliance with tumble pattern control
DE102017219053A1 (de) * 2017-10-25 2019-04-25 BSH Hausgeräte GmbH Verfahren zur Bestimmung von Wäscheeigenschaften in einem Wäschetrockner und hierfür geeigneter Wäschetrockner
WO2019081448A1 (de) * 2017-10-25 2019-05-02 BSH Hausgeräte GmbH Verfahren zur bestimmung von wäscheeigenschaften in einem wäschetrockner und hierfür geeigneter wäschetrockner

Also Published As

Publication number Publication date
EP1816253B1 (de) 2008-10-29
EP1816253A3 (de) 2007-09-05
ATE412796T1 (de) 2008-11-15
ES2317414T3 (es) 2009-04-16
DE602006003405D1 (de) 2008-12-11
PL1816253T3 (pl) 2009-04-30

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