EP0331149A2 - Vorrichtung zum Steuern der Zufuhr von Flüssigwaschmitteln in einer Waschmaschine - Google Patents

Vorrichtung zum Steuern der Zufuhr von Flüssigwaschmitteln in einer Waschmaschine Download PDF

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Publication number
EP0331149A2
EP0331149A2 EP89103592A EP89103592A EP0331149A2 EP 0331149 A2 EP0331149 A2 EP 0331149A2 EP 89103592 A EP89103592 A EP 89103592A EP 89103592 A EP89103592 A EP 89103592A EP 0331149 A2 EP0331149 A2 EP 0331149A2
Authority
EP
European Patent Office
Prior art keywords
comparator
tub
power supply
metering pump
solenoid valve
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
EP89103592A
Other languages
English (en)
French (fr)
Other versions
EP0331149A3 (en
EP0331149B1 (de
Inventor
Graziello Grandin
Roberto Bottoset
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.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi SpA
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 Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Publication of EP0331149A2 publication Critical patent/EP0331149A2/de
Publication of EP0331149A3 publication Critical patent/EP0331149A3/en
Application granted granted Critical
Publication of EP0331149B1 publication Critical patent/EP0331149B1/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
    • 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
    • D06F2103/22—Content of detergent or additives
    • 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
    • D06F2105/02—Water 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/42—Detergent or additive supply

Definitions

  • the present invention relates to an apparatus for controll­ing the supply of liquid detergents in a washing machine, particularly a laundry washer, specifically for automativelyically controlling the supply of metered amounts of liquid detergents determined in accordance with the amount of laundry contained in the drum of the machine.
  • Control devices of this type are usually installed in laundry washing machines designed for the execution of washing cycles in which the tub is filled with water up to predetermined levels for the various laundering and rinsing operations, so that the laundry contained in the drum is completele immersed in the water.
  • control devices of this type determine the supply of metered amounts of liquid detergents to the tub, to result in a detergent concentration required for effectively laundering an amount of laundry corresponding to the maximum capacity of the drum, this concentration being maintained practically invariable even for laundering reduced amounts of laundry.
  • washing operations are performed by soaking the laundry in a highly concentrated detergent solution in water, this solution being drained from the bottom portion of the tub and returned to the upper portion thereof by means of a pump and a recirculation conduit, to be repeatedly sprayed onto the laundry.
  • an apparatus for controlling the supply of liquid detergents in a washing machine particularly a laundry washing machine comprising a tub, a rotatable drum for containing the laundry, a program timer unit for controlling the execution of respective washing cycles, at least one solenoid valve and a pressure switch or similar level control device for admitting water to said tub to fill it up to a preselected maximum level, said pressure switch having a movable contact adapted to be actuated between a first and a second operative position in response respectively to said tub being empty or filled to a level below said maximum level, or filled up to said maximum level, the apparatus additionally comprising at least one metering pump connected to a supply reservoir containing the liquid detergents to be supplied to said tub.
  • control apparatus referred to above is characterized in that it comprises control means connected to said metering pump and adapted to determine, in response to preselected concentrations of said detergents in the water, the energization and deenergization of said meter­ing pump, respectively, wehn said movable contact of said pressure switch is in its first operative position, and when the respective preselected concentration of said detergent has been attained in said tub.
  • FIG. 1 there is shown an electric block circuit diagram of a control apparatus according to the invention, adapted to control the metered supply of liquid detergents to the tub (not shown) of a laundry washing machine, particularly a washing machine of the type in which selected washing cycles are performed by soaking the laundry, contained in a drum (not shown) rotatably mounted in the tub, in a highly concentrated water-detergent solution.
  • the machine is provided with a pump and a recirculation conduit (not shown) for draining the solution from the lower part of the tub and returning it to an upper part thereof, whereat the solution is sprayed onto the laundry.
  • a laundry washing machine of this type is described for example in EP No. 0146719, filed by the present applicant on October 24, 1984.
  • the present control apparatus substantially comprises at least one pressure switch 2 or similar level control device, provided with a movable contact 3 adapted to be displaced between a first operative position in engagement with a fixed contact 4, this first operative position being assumed when the tub is empty or filled with water to a level below a predetermined maximum level, and a second operative position in engagement with a fixed contact 5, this second operative position being assumed when the tub is filled to the predetermined maximum level, with a lim­ited amount of water (in the order of a few litres) sufficient for maintaining the laundry in a soaked condit­ion during the laundering operations.
  • the laundry washing machine is additionally provided with at least one further pressure switch (not shown) permitting the tub to be filled with water to a level above the predetermined maximum level for the execution of rinsing phases or special laundering cycles as provided for instance for laundering synthetic fabrics.
  • the at least one additional pressure switch shall not, however, be considered in the following description, because it does not take part in the metering of the liquid detergents.
  • the control apparatus further comprises a programme timer unit 6 of a conventional type, which is energized from the electric mains circuit via two main conductors 7 and 8 and contains a stack of cams (not shown) adapted to actuate two separate electric contacts 9 and 10 provided for purposes to be described in the following, said stack of cams being adapted to be rotated by a synchronous motor (not shown) when movable contact 3, wich is connected to main conductor 7, is in its second operative position defined above.
  • a programme timer unit 6 of a conventional type, which is energized from the electric mains circuit via two main conductors 7 and 8 and contains a stack of cams (not shown) adapted to actuate two separate electric contacts 9 and 10 provided for purposes to be described in the following, said stack of cams being adapted to be rotated by a synchronous motor (not shown) when movable contact 3, wich is connected to main conductor 7, is in its second operative position defined above.
  • movable contact 3 When on the other hand movable contact 3 is in its second operative position, it is connected in series to solenoid valve 11 via electric contact 9, the opposite terminal of solenoid valve 11 being connected to the other main conductor 8. Solenoid valve 11 is thus caused to open for admitting water to the tub.
  • metering pump 12 For the supply of metered amounts of liquid detergents from a suitably dimensioned supply reservoir (not shown) to the tub is further provided at least one metering pump 12, which is connected to the reservoir and preferivelyanly designed as a positive displacement pump permitting the liquid detergents to be metered at a constant rate.
  • metering pump 12 is connected in parallel to solenoid valve 11 through a pilot stage 13 formed by a triac or a similar control element adapted to control the energization and deenergization of pump 12 in the manner to be described.
  • pilot stage 13 is connected to the output 14 of an electronic comparator 15 and to a power supply circuit 16, the latter being connected in parallel to solenoid valve 11 and adapted to generate an electric voltage for energizing pilot stage 13 and comparator 15.
  • the thus generated voltage is also applied to contact 10 of programme timer unit 6.
  • Contact 10 is connected to power supply circuit 16 and adapted to close on a selected one of two integrator circuits 17 and 18, each of which is connected to a first input 19 of comparator 15 and composed in a per se known manner of a plurality of capacitors connected in parallel to one another to limiter resistors, diodes and other per se known electronic components (none of which are shown in the drawing).
  • integrator circuits 17 and 18 contain respective capacitors having preselected and different time constants so as to generate different charge voltages to be selectively applied to input 19 of comparator 15, depending on whether contact 10 is closed on integrator circuit 17 or 18.
  • a secong input 20 of comparator 15 is connected to power supply circuit 16 through a control circuit 21 adapted to generate a predetermined reference voltage to be applied to input 20.
  • Control circuit 21 comprises at least one voltage divider or the like, which is adjustable for generating reference voltages in a predetermined relation­ship to the hardness of the water sopplied from the mains network.
  • the thus selected reference voltages represent a decive parameter for obtaining detergent solutions of a preselected concentration.
  • the described control apparatus operates as follows:
  • programme timer unit 6 is adjusted to the type of laundering cycle to be executed by the washing machine, depending on the type of fabrics to be laundered.
  • Control circuit 21 on its part has been adjusted to a determined control position corresponding to the hardness of the water supplied from the mains network, to thereby permit a constant concentration of dissolved detergents in the water to be obtained.
  • the machine is thus prepared for admitting water to the tub up to a maximum level determined by pressure switch 2. At this level the tub contains a reduced amount of water in the order of just a few litres. For the execution of specific washing cycles it may be necessary to fill the tub to different levels above the predetermined maximum level under the control of the at least one additional pressure switch (not shown).
  • a predetermined reference voltage generated by control circuit 21 is applied to input 20 of comparator 15 for comparison to the tension generated by one of the two integrator circuits 17 or 18 and applied to the other input 19 of comparator 15.
  • pilot circuit 13 acts to energize metering pump 12 for supplying a metered amount of a liquid detergent to the tub. Pilot stage 13 is enabled to thus energize metering pump 12 by the absence of a signal at the output 14 of comparator 15 due to the different levels of the reference voltage applied to input 20 and the voltage generated by integrator circuit 17 and applied to input 19.
  • Solenoid valve 11 is deenergized on its part by the dis­placement of movable contact 3 of pressure switch 2 to its second operative position, in which it is closed on fixed contact 5 of the pressure switch, as soon as the maximum filling level of the tub as determined by the pressure switch is attained.
  • the present control apparatus is adapted to successively admit additional quantities of water to the tub.
  • solenoid valve 11 When the laundry has absorbed a sufficient amount of water for causing movable contact 3 of pressure switch 2 to return to its first operative position, solenoid valve 11 is again energized for admitting an additional amount of water to the tub. During these phases of renewed ener­gization of solenoid valve 11, which are repeated until the laundry is completely soaked, i.e. saturated, compar­ator 15 acts to compare the reference voltage, which has remained unchanged, to the voltage generated by integrat­ing circuit 18, to thereby control the energization and deenergization of metering pump 12 through pilot stage 13 in the manner described above.
  • the present control apparatus permits the supply of liquid detergents to be accurately metered in accordance with the amount of water admitted to the tub for laundering the amount of laundry actually contained in the drum of the machine, to thereby optimize the consumption of water and detergents during each and any washing cycle.
  • control apparatus permits the preparation of washing solutions having the required detergent concentration during all phases of the washing cycle, to thereby ensure efficient washing of the laundry without the danger of it being damaged in the process, and at the same time to ensure highly reliable operation of the washing machine.
  • control apparatus shown in fig. 2 includes a pressure switch 2 having a movable contact 3, a programme timer unit 6 for actuating in this case only a single electric con­tact 9, a solenoid valve 11, and a metering pump 12.
  • movable contact 3 of pressure switch 2 is also movable between a first and a second operative position to close on fixed contacts 4 and 5, respectively, in the same manner as described above, with the difference, however, that fixed contact 5 is a blind contact.
  • Metering pump 12 is connected to the electric circuit of the control apparatus in a different manner, that is, pump 12 is connected between main electric conductor 7 and a pilot stage 22, which is of the same type and has the same function as pilot stage 13 in fig. 1, and is on its part connected to the other main conductor 8.
  • the control apparatus depicted in fig. 2 further comprises three electronic comparators 23, 24 and 25, two power supply circuits 26 and 27 and two integrator circuits 28 and 29, which are composed of the same electronic compon­ents as integrating circuits 17 and 18 in fig. 1 for thus generating charge voltages each with a preselected and different time constant.
  • circuit 28 is a conventional integrator-­derivator circuit adapted to apply a charge voltage to the comparator 25, to which it is connected, as long as a charge voltage is being applied to the integrator circuit itself, and to discontinue the voltage supply to comparator 25 when it is completely charged.
  • the control apparatus shown in fig. 2 finally includes a control circuit 30 which is identical to the circuit 21 in fig. 1 and adapted to generate a preselected reference voltage to be applied to a first input 31 of comparator 25 for a purpose to be described.
  • power supply circuit 26 is connected to main conductor 7 and to comparators 23, 24 and 25, themselves connected to ground, and to integrator circuit 29 and control circuit 30, both of which are likewise connected to ground, for thus generating corresponding electric voltages for the energization of all these components.
  • Power supply circuit 26 is additionally connected to a first input 32 of comparator 24, the output 33 of which is connected to control circuit 30 for permitting the level of the refer­ence voltage generated by the latter to be varied under conditions to be described, said power supply circuit 26 being finally connected to a first input 34 of comparator 23.
  • Power supply circuit 27 on its part is connected to a common junction point between solenoid valve 11 and electric contact 9 of programme timer unit 6, and to the second input 36 of comparator 23.
  • the output 37 of the latter is connected to the second inputs 38 and 39 of comparators 24 and 25, respectively, through integrator circuit 29 and integrator-derivator circuit 28.
  • the present control apparatus finally comprises a positive reaction circuit 40 connected between the second input 38 and out­put 33 of comparator 24 so as to maintain output 33 at the same logic level as second input 38 during the entire washing cycle of the machine to a purpose to be described.
  • control apparatus described in precedence operates as follows: As in the first embodiment described, a washing cycle to be executed by the washing machine is initiated by adjusting programme timer unit 6 to the position of the selected washing cycle, and adjusting the voltage divider of control circuit 30 to the control position correspond­ing to the hardness of the water to be supplied to the tub of the machine. At this stage the machine is prepared to have water admitted to its tub in the manner described with reference to the first embodiment. At the same time control circuit 30 is operable to generate a determined reference voltage to be applied to first input 31 of comparator 25 for comparison to the voltage generated by integrator-derivator circuit 28 and applied to second input 39 of comparator 25.
  • output 41 of comparator 25 may assume one of two different logic states to thereby determine the energization or deenergization of metering pump 12 through pilot stage 22.
  • movable contact 3 of pressure switch 2 is switched to its first operative position to close on fixed contact 4 of the pressure switch, while programme timer unit 6 operates to advance the selected washing cycle to a state in which its electric contact 9 closes on solenoid valve 11.
  • integrator circuit 29 is slowly charged up to its predetermined maximum voltage level, whereas input 38 of comparator 24 remains at a low logic level as long as this maximum voltage level is not yet attained.
  • input 32 of comparator 24 is at a high logic level due to the voltage directly applied thereto by power supply circuit 26.
  • output 33 of comparator 24 also remains at a low logic level to thereby maintain the reference voltage initially selected by adjusting the voltage divider of control circuit 30 unchanged.
  • Integrator-derivator circuit 28 on its part is also energized, the respective voltage level being directly applied to second input 39 of comparator 25, causing it to assume a high logic level.
  • first input 31 of comparator 25 is also at a high logic level due to the presence thereat of the reference voltage generated by control circuit 30, output 41 of comparator 25 also assumes a high logic level to thereby enable pilot stage 22 to energize metering pump 12.
  • metering pump 12 is simultaneously operated to supply liquid detergent to the tub as long as the voltage generated by integrator-derivator circuit 28 is lower than the reference voltage.
  • Output 33 is subsequently maintained at the high logic level due to the presence of positive reaction circuit 40, so that the reference voltage applied to input 31 of comparator 25 is maintained at its new preselected level for all of the remainder of the washing cycle of the machine.
  • movable contact 3 of pressure switch 2 is displaced to its second operative position to close on fixed contact 5 of the pressure switch, to thereby deenergize solenoid valve 11, so that water is no longer admitted to the tub of the machine.
  • programme timer unit 6 operates to maintain electric contact 9 closed and to control all of the remaining electric components (not shown) of the machine in the sequence of the selected washing cycle.
  • solenoid valve 11 results in power supply circuit 27 being no longer energized, whereas power supply circuit 26 continues to have the mains voltage applied thereto.
  • inputs 36 and 34 of comparator 23 connected respectively to the power supply circuits are at a low logic level and a high logic level, respectively, so that output 37 of this comparator is also at a low logic level.
  • output 41 of comparator 25 also assumes a low logic level, to thereby maintain metering pump 12 in the deenergized state.
  • the present control apparatus may then successively and automatically operate to admit additional amounts of water to the tub, for instance when the laundry in the drum has an excessive absorption capacity.
  • solenoid valve 11 is energized as a result of movable contact 3 of pressure switch 2 closing on fixed contact 4, while electric contact 9 of programme timer unit 6 is maintained in its closed state.
  • comparator 25 Since the other input 31 of comparator 25 has the reference voltage generated by control circuit 30 applied thereto and is thus also at a high logic level, output 41 of comparator 25 will now also assume a high logic level, to thereby enable pilot stage 22 to again energize meter­ing pump 12, causing it to supply additional metered amounts of liquid detergent to the tub of the machine.
  • metering pump 12 is thus automatically energized and deenergized simultaneously with the admission of water to the tub and for the full duration of the respective phase.
  • the voltage generated by power supply circuit 27 is also applied to integrator circuit 29, as a result of which the latter is progressively charged and input 38 of comparator 24 is maintained at a low logic level until integrator circuit 29 has been charged to its maximum voltage.
  • comparator 24 acts to maintain the reference voltage generated by control circuit 30 at a constant level, irrespective of the logic levels of inputs 38 and 32 of comparator 24, and for the full duration of the washing cycle of the machine.
  • programme timer unit 6 automatically acts to deenergize all the electric components of the present control apparatus, as a result of which output 33 of comparator 24 is returned to the logic level zero, and the voltage divider of control circuit 30 is automatically readjusted to again generate a reference voltage equal to that generated initially. The machine is thus ready for initiating a further wasging cycle in a similar manner as described.
  • a further embodiment of the present control apparatus which in this case comprises a microprocessor 42 for performing the functions of the programme timer unit 6 of the preced­ing embodiments, a pressure switch 2, a solenoid valve 11 and a metering pump 12, the last-named elements being substantially identical to the respective elements employed in the preceding embodiments.
  • microprocessor 42 is energized from electric main conductors 7 and 8 of the machine through an associated power supply circuit 43, and is operatively connected to movable contact 3 and fixed contacts 4 and 5 of pressure switch 2, and in addition to solenoid valve 11 and metering pump 12 through respective pilot stages 44 and 45 each comprising a triac or similar control elements.
  • Solenoid valve 11 and metering pump 12 on their part are connected respectively to main conductor 7 and main conductor 8 through the associated pilot stages 44 and 45.
  • Microprocessor 42 is programmed to control the energization and deenergization, respectively, of solenoid valve 11 through pilot stage 44 in response to movable contact 3 closing on fixed contact 4 or 5 of pressure switch 2, and to simultaneously store the time interval during which solenoid valve 11 is thus energized, for using this time interval as a reference value for determining the time interval during which metering pump 12 is to be energized in the course of the washing cycle.
  • Microprocessor 42 thus controls the energization of meter­ing pump 12 through pilot stage 45, to maintain it in its energized state for a duration which is proportional to the thus established reference value and automatically determined by microprocessor 42 so as to obtain the desired liquid detergent concentration in the water admitted to the tub, whereupon metering pump 12 is deenergized.
  • microprocessor 42 is energized through power supply circuit 43 while movable contact 3 is closed on fixed contact 4 of pressure switch 2, as a result of which solenoid valve 11 is energized through pilot stage 44.
  • microprocessor 42 notes the energized state of solenoid valve 11 and acts to control the ener­gization of metering pump 12 through pilot stage 45, mainaining it in its energized state for a time interval stored in microprocessor 42 and calculated so as to ensure that the desired concentration of liquid detergents in the water to be admitted to the tub of the machine is obtained.
  • movable contact 3 closes on fixed contact 5 of pressure switch 2, causing micro­processor 42 to control the deenergization of solenoid valve 11, as a result of which the admission of water to the tub is interrupted.
  • microprocessor 42 acts to automatically control the execution of the washing cycle and, in the case that the level of the water contained in the tub drops below the predetermined maximum level due to an excessive water absorption capacity of the laundry in the drum, causing movable contact 3 to again close on fixed contact 4 of pressure switch 2, to again and repeatedly energize and deenergize solenoid valve 11 and metering pump 12 in the manner described above.
EP89103592A 1988-03-02 1989-03-01 Vorrichtung zum Steuern der Zufuhr von Flüssigwaschmitteln in einer Waschmaschine Expired - Lifetime EP0331149B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45708/88A IT1220742B (it) 1988-03-02 1988-03-02 Dispositivo di regolazione dell'immissione di detersivi liquidi delle macchine lavatrici,in particolare lavabiancheria
IT4570888 1988-03-02

Publications (3)

Publication Number Publication Date
EP0331149A2 true EP0331149A2 (de) 1989-09-06
EP0331149A3 EP0331149A3 (en) 1990-02-14
EP0331149B1 EP0331149B1 (de) 1993-01-07

Family

ID=11257462

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89103592A Expired - Lifetime EP0331149B1 (de) 1988-03-02 1989-03-01 Vorrichtung zum Steuern der Zufuhr von Flüssigwaschmitteln in einer Waschmaschine

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Country Link
EP (1) EP0331149B1 (de)
DE (1) DE68904210T2 (de)
ES (1) ES2037891T3 (de)
IT (1) IT1220742B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1215329A2 (de) * 2000-12-13 2002-06-19 Miele & Cie. GmbH & Co. Verfahren zum Waschen von Wäsche
EP1639175A1 (de) * 2003-05-28 2006-03-29 LG Electronics, Inc. Betriebsverfahren für waschmaschine
US7971301B2 (en) 2003-05-28 2011-07-05 Lg Electronics Inc. Washing machine and the control method of the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2051413A (en) * 1979-05-30 1981-01-14 Licentia Gmbh Washing machine
US4503575A (en) * 1982-12-02 1985-03-12 Whirlpool Corporation Automatic liquid control system for a clothes washing machine
DE3446288A1 (de) * 1984-12-19 1986-06-19 Licentia Gmbh Verfahren und anordnung zur programmsteuerung einer waschmaschine
EP0231843A2 (de) * 1986-02-05 1987-08-12 Bosch-Siemens HausgerÀ¤te GmbH Verfahren zum automatischen Zugeben von Waschmittel-Wirkstoffen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2051413A (en) * 1979-05-30 1981-01-14 Licentia Gmbh Washing machine
US4503575A (en) * 1982-12-02 1985-03-12 Whirlpool Corporation Automatic liquid control system for a clothes washing machine
DE3446288A1 (de) * 1984-12-19 1986-06-19 Licentia Gmbh Verfahren und anordnung zur programmsteuerung einer waschmaschine
EP0231843A2 (de) * 1986-02-05 1987-08-12 Bosch-Siemens HausgerÀ¤te GmbH Verfahren zum automatischen Zugeben von Waschmittel-Wirkstoffen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1215329A2 (de) * 2000-12-13 2002-06-19 Miele & Cie. GmbH & Co. Verfahren zum Waschen von Wäsche
EP1215329A3 (de) * 2000-12-13 2003-07-09 Miele & Cie. KG Verfahren zum Waschen von Wäsche
EP1639175A1 (de) * 2003-05-28 2006-03-29 LG Electronics, Inc. Betriebsverfahren für waschmaschine
EP1639175A4 (de) * 2003-05-28 2010-04-07 Lg Electronics Inc Betriebsverfahren für waschmaschine
US7971301B2 (en) 2003-05-28 2011-07-05 Lg Electronics Inc. Washing machine and the control method of the same
US8015645B2 (en) 2003-05-28 2011-09-13 Lg Electronics Inc. Washing machine and a method of controlling the same based on measured hardness of water

Also Published As

Publication number Publication date
EP0331149A3 (en) 1990-02-14
IT8845708A0 (it) 1988-03-02
ES2037891T3 (es) 1993-07-01
DE68904210T2 (de) 1993-05-06
EP0331149B1 (de) 1993-01-07
DE68904210D1 (de) 1993-02-18
IT1220742B (it) 1990-06-21

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