EP1412574B1 - Verfahren zum betreiben eines wasserführenden haushaltgerätes und haushaltgerät hierfür - Google Patents

Verfahren zum betreiben eines wasserführenden haushaltgerätes und haushaltgerät hierfür Download PDF

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Publication number
EP1412574B1
EP1412574B1 EP02748705A EP02748705A EP1412574B1 EP 1412574 B1 EP1412574 B1 EP 1412574B1 EP 02748705 A EP02748705 A EP 02748705A EP 02748705 A EP02748705 A EP 02748705A EP 1412574 B1 EP1412574 B1 EP 1412574B1
Authority
EP
European Patent Office
Prior art keywords
program
value
values
domestic appliance
treatment liquid
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
Application number
EP02748705A
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German (de)
English (en)
French (fr)
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EP1412574A1 (de
Inventor
Gundula Czyzewski
Martina Wöbkemeier
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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
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Publication of EP1412574A1 publication Critical patent/EP1412574A1/de
Application granted granted Critical
Publication of EP1412574B1 publication Critical patent/EP1412574B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D06F34/22—Condition of the washing liquid, e.g. turbidity
    • 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
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention
    • 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
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4297—Arrangements for detecting or measuring the condition of the washing water, e.g. turbidity
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/10—Water cloudiness or dirtiness, e.g. turbidity, foaming or level of bacteria
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/26—Indication or alarm to the controlling device or to the user
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/32—Stopping or disabling machine operation, including disconnecting the machine from a network, e.g. from an electrical power supply
    • 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
    • D06F2103/20—Washing liquid condition, e.g. turbidity
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/62—Stopping or disabling machine operation

Definitions

  • the invention relates to a method for operating a water-conducting household appliance with an optical sensor system for monitoring the treatment liquid, which is to be changed during a program sequence times at a standstill and in motion.
  • Known sensor systems have at least one radiation source and one or more radiation receivers. Such sensors are in widespread use especially in washing machines and dishwashers in use, the physical effects of the reflection, the scattering and / or the refraction are exploited at optical interfaces.
  • US 5 048 139 discloses the intended use of such a known sensor system, a so-called turbidity sensor. Its readings are used exclusively to control those processes in a washing machine, which are directly dependent on the turbidity of the liquor.
  • the typical task that in a method and with a device using a turbidity sensor, the end of a washing and a rinsing program can be reliably determined, is solved by means of the turbidity sensor so that it is decided on the basis of the measured turbidity value of the rinse water Rinse program can be terminated or must be supplemented by further rinses.
  • a washing machine with a turbidity sensor i. with a sensor system for detecting the degree of soiling of the wash liquor.
  • Light source and receiver are arranged so that the transmitted light is measured. Based on the ratio of the values of the incoming and outgoing light, the turbidity of the medium is determined.
  • the light can be monochromatic or have a broad spectrum. By using a mirror system, the light transmitter and receiver can be freely arranged within wide limits.
  • the turbidity sensor can also be used to detect foam and thus contribute to the control of the rinsing process. Spatially, the turbidity sensor should be located in an area where foam accumulates particularly well, such as in the drain neck.
  • the use of one or more rod-shaped sensor modules is described.
  • the recorded measured value depends on the different refractive indices of the surrounding medium.
  • the sensor module can now detect whether the surrounding medium is air, water or foam.
  • the module can also be used for level detection or for level detection in the tub. If the area under the bottom-side heating in the tub is monitored, the respective sensor module also serves as an effective dry-running protection for the heating.
  • a combination solution is given in DE 198 31 688 A1.
  • the continuous radiation and the radiation reflected at the interface of the sensor body to the surrounding medium can be detected.
  • two radiation sources are operated in time division multiplex.
  • the signals triggered by the two radiation sources are recorded successively in time by the radiation receiver and evaluated according to their assignment for the process control.
  • the system allows to optimize the process according to time, temperature, water and energy consumption.
  • Foaming can be recognized by a diffuse distribution of the received light.
  • the wash liquor is clouded when the received signal is evenly attenuated.
  • the level in the tub is determined by the light cone impinging on different photodiodes of the receiver screen.
  • Optical sensor systems are prone to failure. Errors in the determination of the washing lye turbidity can occur due to calcification of the optical measuring section. Since the measuring section dries out after each working process, the measuring beam in the optical measuring section can already be so strongly dampened even with clear water that the signal evaluation circuit detects a supposed lukewarming. To counteract this is proposed in DE 197 21 976 A1, during each working cycle to measure the attenuation of the measuring section without cloudy liquor. This reading is then compared to a threshold. A control signal is issued when the reading reaches or approaches the threshold.
  • optical transmitters eg LED
  • optical receivers eg phototransistor or photoresistor
  • a temperature compensation of the turbidity sensor is required in all devices in which the cleaning liquid is heated.
  • DE 195 21 326 A1 is a Proposed method to compensate for the temperature-dependent parameters individually and dynamically adjust the calculated compensation factor.
  • the sensor for measuring the degree of soiling is also used for temperature measurement.
  • the optical sensor is preferably located in the vicinity of the liquor, so that the best possible thermal coupling between the sensor and the liquor exists.
  • a defined current is applied to the input of the sensor and the temperature-dependent threshold voltage is tapped at the output of the sensor.
  • the temperature-dependent output signal is evaluated and used to control a heating element. This can be dispensed with a conventional temperature sensor in the water cycle.
  • DE 199 08 803 A1 proposes an arrangement in which three light-emitting diodes are used, the light with three different narrow-band, typical for the recognition of colors wavelength ranges in the wash liquor radiate. There, the incident light passes enfinreder as direct or laterally scattered at the color particles light radiation or as the color particles backward scattered light radiation to the photodiode
  • the direct, the laterally scattered and the backward scattered amount of light can be determined simultaneously for each light-emitting diode.
  • the direct, the laterally scattered and the backward scattered amount of light can be determined simultaneously for each light-emitting diode.
  • the invention has for its object to expand the possibilities of process monitoring in water-bearing household appliances, especially in washing machines or dishwashers, through the use of known optical sensor systems.
  • a plurality of measured values are recorded at standstill and during operation of the laundry drum and an average value is formed from each of these, which are then used as a comparison value for the difference value.
  • the method according to the invention can advantageously also be developed in a manner in which a trend of the measured values from a plurality of measured values of the rest or movement phase is determined, ie. H. a drop or increase in the level of the measurement signal over the period considered.
  • This method is advantageous to use in sensor systems that are used for foam detection. Since the foam formation is delayed at the beginning of the movement phase and the foam dissolves relatively slowly when the laundry drum is at a standstill, the process according to the invention adheres to a certain inertia, which can not be sufficiently compensated by the averaging described above. A remedy is to record the change in the measured value over time. Opposite tendencies in the resting phase compared to the operating phase indicate that the mechanical drive system works without interference.
  • the invention offers the advantage, by using known optical sensors to provide a further control of the proper operation of a water-bearing household appliance and thus to increase the reliability of the device.
  • the inventive method is applicable regardless of the specific structural design of the sensor system, regardless of the physical principle and also independent of the specific application. The only requirement is that the values determined by the sensor when the work system is stationary and moving have a sufficiently large difference. Sensor systems, such as listed above, can be used without the use of additional modules or components for the inventive method. The additional investment required reduces to a modification of the existing operating programs, ie the design of the software.
  • the absolute height of the individual measured value plays no role in the functional efficiency of the method. This results in the great advantage that the method works safely regardless of the degree of contamination of the wash liquor, of its temperature, of the detergent concentration and of the calcification of the measuring section.
  • a light-emitting diode 2 and a phototransistor 3 are arranged opposite one another on the outer circumference of a pipe section 4 made of transparent material.
  • the pipe section 4 is a part of the discharge nozzle, which adjoins directly to the tub.
  • Such an arrangement of LED 2 and phototransistor 3 may preferably be present in the lower region of the tub of the washing machine.
  • the phototransistor 3 measures the light signal emitted by the light-emitting diode 2 and passing through the wash liquor in the tube section 4. The measured value is fed to a microprocessor 5.
  • the height of the measured value determined by the phototransistor 3 is dependent on the attenuation of the emitted light signal, caused by the turbidity of the wash liquor or by foaming in the region of the measuring section 1.
  • the program section and the height of the measured values determined by the microprocessor 5 signals for the further control of Washing machine generated.
  • the measured movement values 30 and 40 in the turbidity diagram T differ depending on the direction of rotation of the laundry drum, which come about through the corresponding speed values 50 and 50 in the speed diagram D, in each case in FIG.
  • the resting measured values 10 are still above a baseline 0.
  • the determined measured value difference lies below a predefined setpoint value, ie if the quiescent value and the value which would have to be measured during movement are only approximately equal, this circumstance can indicate a fault in the drive system.
  • the fault may concern the drive motor or the motion transmission system, such as caused by a V-belt crack.
  • another sensor would have to be present which can directly monitor the rotation of the drive motor, for example a tachogenerator permanently coupled to the drive motor for speed control.
  • the sensor system determines the time course of the measured values over a period of time determined by the program, ie. H. the increase or decrease in the measured values over time is recorded. This takes into account the fact that foam can collect in the lower area of the tub during spinning, which slowly decays again when the drum is at rest.
  • the mechanical drive system works trouble-free when the measured value rises in the resting phase and drops during spin.
  • the setpoint stored in the program memory which serves as a comparison value for the measured values of the sensor, can be easily determined from tests. Different setpoint values can be stored for different program sections.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Massaging Devices (AREA)
  • Water Treatment By Sorption (AREA)
  • Mechanically-Actuated Valves (AREA)
EP02748705A 2001-07-19 2002-05-16 Verfahren zum betreiben eines wasserführenden haushaltgerätes und haushaltgerät hierfür Expired - Lifetime EP1412574B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10135191A DE10135191A1 (de) 2001-07-19 2001-07-19 Verfahren zum Betreiben eines wasserführenden Haushaltgerätes und Haushaltgerät hierzu
DE10135191 2001-07-19
PCT/EP2002/005414 WO2003008695A1 (de) 2001-07-19 2002-05-16 Verfahren zum betreiben eines wasserführenden haushaltgerätes und haushaltgerät hierfür

Publications (2)

Publication Number Publication Date
EP1412574A1 EP1412574A1 (de) 2004-04-28
EP1412574B1 true EP1412574B1 (de) 2006-06-28

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Application Number Title Priority Date Filing Date
EP02748705A Expired - Lifetime EP1412574B1 (de) 2001-07-19 2002-05-16 Verfahren zum betreiben eines wasserführenden haushaltgerätes und haushaltgerät hierfür

Country Status (9)

Country Link
US (2) US7246396B2 (es)
EP (1) EP1412574B1 (es)
KR (1) KR100850831B1 (es)
CN (1) CN100338293C (es)
AT (1) ATE331831T1 (es)
DE (2) DE10135191A1 (es)
ES (1) ES2266533T3 (es)
PL (1) PL197422B1 (es)
WO (1) WO2003008695A1 (es)

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US8506725B2 (en) * 2008-02-15 2013-08-13 Electrolux Home Products, Inc. Washing appliance and associated method
DE102008028030A1 (de) 2008-06-12 2009-12-24 BSH Bosch und Siemens Hausgeräte GmbH Verfahren und Einrichtung zum Bestimmen von Schaum in einer Waschmaschine
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US20110095010A1 (en) * 2009-10-23 2011-04-28 Bondarowicz Frank A Water tank heater with predictive heater failure feature
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DE102010031266A1 (de) 2010-07-13 2012-01-19 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Erkennen eines Ausfalls eines Riemens in einem Haushaltsgerät zur Pflege von Wäschestücken
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CN112095292B (zh) * 2019-05-28 2023-06-30 重庆海尔洗衣机有限公司 一种洗衣机的异常检测方法

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Also Published As

Publication number Publication date
US20040182116A1 (en) 2004-09-23
KR20040018430A (ko) 2004-03-03
US20070272602A1 (en) 2007-11-29
PL369197A1 (en) 2005-04-18
CN100338293C (zh) 2007-09-19
ES2266533T3 (es) 2007-03-01
ATE331831T1 (de) 2006-07-15
US7246396B2 (en) 2007-07-24
DE50207395D1 (de) 2006-08-10
CN1533456A (zh) 2004-09-29
DE10135191A1 (de) 2003-01-30
KR100850831B1 (ko) 2008-08-06
EP1412574A1 (de) 2004-04-28
PL197422B1 (pl) 2008-03-31
WO2003008695A1 (de) 2003-01-30

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