EP0118719A1 - Überwachungsvorrichtung der Wasserzufuhreinrichtung eines Geschirrspülers - Google Patents

Überwachungsvorrichtung der Wasserzufuhreinrichtung eines Geschirrspülers Download PDF

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Publication number
EP0118719A1
EP0118719A1 EP84101016A EP84101016A EP0118719A1 EP 0118719 A1 EP0118719 A1 EP 0118719A1 EP 84101016 A EP84101016 A EP 84101016A EP 84101016 A EP84101016 A EP 84101016A EP 0118719 A1 EP0118719 A1 EP 0118719A1
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EP
European Patent Office
Prior art keywords
water inlet
output
control system
transducer
pump
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
EP84101016A
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English (en)
French (fr)
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EP0118719B1 (de
Inventor
Claudio Milocco
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
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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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11257367&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0118719(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Priority to AT84101016T priority Critical patent/ATE21209T1/de
Publication of EP0118719A1 publication Critical patent/EP0118719A1/de
Application granted granted Critical
Publication of EP0118719B1 publication Critical patent/EP0118719B1/de
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Classifications

    • 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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0023—Water filling
    • 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
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4217—Fittings for water supply, e.g. valves or plumbing means to connect to cold or warm water lines, aquastops
    • 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
    • A47L15/421—Safety arrangements for preventing water damage
    • 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
    • A47L2401/08—Drain or recirculation pump parameters, e.g. pump rotational speed or current absorbed by the motor
    • 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
    • A47L2401/14—Water pressure or flow rate
    • 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
    • A47L2501/01—Water supply, e.g. opening or closure of the water inlet valve

Definitions

  • the present invention relates to an automatic dishwasner, and more particularly to a water inlet control system for such dishwasher.
  • a water inlet control system for a dishwasher of the type in which the water circulation pump is operated during the phase during which the machine is being charged with tap water.
  • An electro-mechanical transducer is operative to measure the outlet pressure of the pump and to deenergize a water inlet electrovalve when the outlet pressure exceeds a predetermined value. In theory, this value is calculated so as to correspond to the saturation condition of said circulation pump, and thus to the minimum amount of water required for optimum operation of the pump.
  • a water inlet control system for an automatic dishwasher comprising a water inlet valve controlled by a program unit so as to open during at least one charging phase, and a water circulation pump controlled by said program unit to operate at least during the last part of the charging phase, a transducer being provided to generate an output signal proportional to the outlet pressure of said pump.
  • This system is basically characterized in that the output signal of the transducer is applied to control means responsive to variations of said output signal for causing the inlet valve to be closed when the-amplitude of the variations decreases below a predetermined value.
  • a dishwasher comprises an inlet conduit 4 for feeding tap water to a washing tub 5.
  • inlet conduit 4 is provided with an electromagnetic inlet valve 6 controlled by a program unit 7 of the dishwasher via a normally open breaker switch 17, for instance an electronic interruptor.
  • Inlet conduit 4 is additionally provided with a hydraulic safety device including a free flow section 8.
  • inlet conduit 4 communicates with a collecting well 10 of the dishwasher preferably in the manner described in applicant's European Patent Application No. 80102829.1/1980.
  • a water circulation pump 9 is also controlled by program unit 7 for drawign water from collecting well 10 and pressure-feeding it to at least one spray rotor 11.
  • Collecting well 10 and circulation pump 9 are preferably disposed as described in applicant's Italian Patent Application No. 45715/79, corresponding to GB Patent 2,049,406.
  • the outlet conduit of pump 9 is connected to the control inlet 14 of a pressure transducer 13 through a brnach conduit 12.
  • Pressure transducer 13 may for example be a semiconductor pressure transducer sold by Motorola Inc. under the designation MPX 100.
  • MPX 100 a transducer of this type is adapted to generate at its output 15 a DC voltage signal the magnitude of which is proportional to the hydraulic pressure applied to inlet 14.
  • output 15 of transducer 13 controls a control circuit 16 the output of which is employed for controlling breaker switch 17.
  • control circuit 16 A preferred embodiment of control circuit 16 is shown in fig. 2. As shown therein, the voltage appearing at the output 15 of transducer 13 is amplified by an amplifier 18 and passed through a high-pass filter 19 for controlling a peak detector 20, the output of which is applied to a threshold value stage 21. Stage 21 is of a per se known type adapted to generate a DC output voltage only when the amplitude of a signal applied to its input excedds a predetermined value for at least a certain period of time. The output of stage 21 is connected to a first input of an "OR" gate circuit 22, the output of which controls breaker switch 17. In particular, breaker switch 17 is operated to close by a voltage appearing at the output of gate circuit 22.
  • the output of amplifier 18 is appied, in addition to high-pass filter 19, to a second threshold value stage 23 substantially similar to stage 21, but having an inverting output.
  • the two threshold value stages 21 and 23 may for instance be formed by respective sections of an integrated circuit LM 324 made by RCA.
  • LM 324 made by RCA.
  • the various connections for the power supply to the various components are not shown in figs. 1 and 2.
  • the present invention is substantially based on the finding that, depending on various structural and functional properties of the hydraulic circuit of the dishwasher familiar to those# skilled in the art, the initial operation of circulating pump 9 develops in a particular manner as shown in fig.
  • the voltage at the output 15 of transducer 13 develops in a manner corresponding to curve 25 in fig. 3, which may be represented by a continuous component corresponding to curve 24 in fig. 3, with an attenuated oscillatory component superimposed thereon.
  • the program unit 7 causes the entire system to be energized and controls the opening of electrovalve 6 by actuating braker switch 17 to the closed condition.
  • the output of Transducer 13 is at zero voltage, as is also the input of threshold value stage 23. This causes the latter to generate an output voltage which is applied to OR gate 22 for actuating breaker switch 17 to its closed state, as already stated, independently of the output s.ignal of stage 21.
  • program unit 7 also causes circulation pump 9 to be energized so as to initiate its operation at instant t1.
  • transducer 13 generates the above described osciallting output voltage, which is amplified by amplifier 18 and applied to threshold value stage 23, the output voltage of which drops to zero as the respective threshold value is attained.
  • breaker switch 17 nevertheless 'remains closed as a result of the output signal of amplifier 18 being applied to high-pass filter 19, causing the latter to supply to peak detector 20 only an alternating voltage component representing the variations of the outlet pressure of pump 9 independently of its absolute value.
  • Peak detector 20 supplies threshold value stage 21 with a continuous voltage proportional to the peak value of the above mentioned alternating component.
  • this voltage exceeds the threshold value of stage 21, so that the latter generates an output voltage which is applied to gate circuit 22 for maintaining breaker switch 17 in the closed state.
  • Solenoid valve 6 therefore continues to admit water to washing tub 5 until, at instant t2, a water level is attained which is sufficient for saturated operation of Pump 9.
  • the input voltage of threshold value stage 21 drops to below its threshold value (which by the way may be varied as required by suitably dimensioning its components), so that the output voltage of stage 21 drops to zero.
  • the output voltage of the other threshold value stage 23 is also zero, because the voltage applied to its input (corresponding to the absolute value of the outlet pressure of pump 9) continues to be above the threshold value of stage 23.
  • the output of OR gate circuit 22 cummutates to zero voltage, causing breaker switch 17 to open, and solenoid valve 6 to close accordingly.
  • the charging phase for the admittance of water to the dishwasher is terminated as soon as the minimum water level resquired for proper operation of pump 9 is attained.
  • This is accomplished by means of a control system which takes into account practically all of the parameters (amount of dishes and the like, characteristics of the pump and of the hydraulic circuit of the machine etc.) required for determining the optimum water level.
  • the control system according to the invention being based on the detection of variations of the pump outlet pressure as well as of the absolute value thereof, is substantially not susceptible to malfunction caused for instance by tolerances of transducer 13 or thermal deformations which might affect its functions, and completely independent of tolerances of the hydraulic circuit of the machine.
  • the described water inlet control system may of course be modified in various manners.
  • the system according to the invention functions properly to control the control means 16 on the base of any physical value corresponding to the outlet pressure of the circulation pump.
  • Such physical value may for instance be the current or the active potential absorbed by the electric motor of pump 9, or the speed of rotation of the motor, or even the speed of rotation of spray rotor 11 (employing for instance a device of the type described in European Patent Application No. 81107639.7).
  • the transducer 13 employed will of course have to be of a type adapted to the specific concept as will be realized by those skilled in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP84101016A 1983-02-14 1984-02-01 Überwachungsvorrichtung der Wasserzufuhreinrichtung eines Geschirrspülers Expired EP0118719B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84101016T ATE21209T1 (de) 1983-02-14 1984-02-01 Ueberwachungsvorrichtung der wasserzufuhreinrichtung eines geschirrspuelers.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4570383 1983-02-14
IT45703/83A IT1174941B (it) 1983-02-14 1983-02-14 Sistema di controllo del carico d'acqua per lavastoviglie

Publications (2)

Publication Number Publication Date
EP0118719A1 true EP0118719A1 (de) 1984-09-19
EP0118719B1 EP0118719B1 (de) 1986-08-06

Family

ID=11257367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84101016A Expired EP0118719B1 (de) 1983-02-14 1984-02-01 Überwachungsvorrichtung der Wasserzufuhreinrichtung eines Geschirrspülers

Country Status (4)

Country Link
EP (1) EP0118719B1 (de)
AT (1) ATE21209T1 (de)
DE (1) DE3460404D1 (de)
IT (1) IT1174941B (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577788A1 (fr) * 1985-02-28 1986-08-29 Esswein Sa Lave-vaisselle a electrovanne d'introduction d'eau commandee par la pression de la pompe de cyclage
EP0248339A1 (de) * 1986-06-04 1987-12-09 INDUSTRIE ZANUSSI S.p.A. Waschmaschine mit Überwachungsvorrichtung für die Wasserzufuhr
EP0326893A2 (de) * 1988-02-02 1989-08-09 Hanning Elektro-Werke GmbH & Co. Geschirrspülmaschine
FR2630321A1 (fr) * 1988-04-22 1989-10-27 Esswein Sa Procede de remplissage en eau d'un lave-vaisselle et lave-vaisselle mettant en oeuvre ce procede
EP0476526A1 (de) * 1990-09-21 1992-03-25 Glastender, Inc. Geschirrspüler mit Füllwasserkontrolle
GB2250059A (en) * 1990-10-02 1992-05-27 Zanussi Elettrodomestici Circulating pump for dishwashers
EP0534213A1 (de) * 1991-09-26 1993-03-31 ZANUSSI GRANDI IMPIANTI S.p.A. Überwachungseinrichtung für wasch- und spülprogrammgesteuerte Geschirrspülmaschine
EP0569733A1 (de) * 1992-05-12 1993-11-18 AEG Hausgeräte GmbH Geschirrspülmaschine
US5722263A (en) * 1995-01-12 1998-03-03 Electrolux Zanussi Elettrodomestici Washing machine with dynamic water inlet control arrangement
US6551414B2 (en) * 2001-01-19 2003-04-22 U.S. Chemical Corporation Automatic system and method for removing mineral deposits from a dishwasher
CN100584264C (zh) * 2004-01-23 2010-01-27 Bsh博施及西门子家用器具有限公司 液体导引式的家用电器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4235973A1 (de) * 1992-10-24 1994-04-28 Miele & Cie Verfahren und Anordnung zur Steuerung des Wasserzulaufs bei programmgesteuerten Geschirrspülmaschinen
DE4418721A1 (de) * 1994-05-28 1995-11-30 Licentia Gmbh Steuerungsverfahren für Laugenumwälz-Pumpen in Haushalt-Geschirrspülmaschinen
DE10154630C5 (de) * 2001-11-07 2008-02-07 Diehl Ako Stiftung & Co. Kg Verfahren zum Betreiben einer elektromotorisch angetriebenen Pumpe in einer Spülmaschine
US11284773B2 (en) 2020-01-31 2022-03-29 Haier Us Appliance Solutions, Inc. System and method for controlling the water fill level within a dishwasher appliance

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1595556A (en) * 1978-02-21 1981-08-12 Hobart Corp Fill control system for an automatic dishwasher
FR2499396A1 (fr) * 1981-02-06 1982-08-13 Esswein Sa Machine a laver la vaisselle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1595556A (en) * 1978-02-21 1981-08-12 Hobart Corp Fill control system for an automatic dishwasher
FR2499396A1 (fr) * 1981-02-06 1982-08-13 Esswein Sa Machine a laver la vaisselle

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577788A1 (fr) * 1985-02-28 1986-08-29 Esswein Sa Lave-vaisselle a electrovanne d'introduction d'eau commandee par la pression de la pompe de cyclage
EP0248339A1 (de) * 1986-06-04 1987-12-09 INDUSTRIE ZANUSSI S.p.A. Waschmaschine mit Überwachungsvorrichtung für die Wasserzufuhr
US4741357A (en) * 1986-06-04 1988-05-03 Industrie Zanussi Spa Washing machine with a control system for controlling the supply of water
EP0326893A2 (de) * 1988-02-02 1989-08-09 Hanning Elektro-Werke GmbH & Co. Geschirrspülmaschine
EP0326893A3 (de) * 1988-02-02 1990-03-21 Hanning Elektro-Werke GmbH & Co. Geschirrspülmaschine
FR2630321A1 (fr) * 1988-04-22 1989-10-27 Esswein Sa Procede de remplissage en eau d'un lave-vaisselle et lave-vaisselle mettant en oeuvre ce procede
EP0476526A1 (de) * 1990-09-21 1992-03-25 Glastender, Inc. Geschirrspüler mit Füllwasserkontrolle
GB2250059A (en) * 1990-10-02 1992-05-27 Zanussi Elettrodomestici Circulating pump for dishwashers
EP0534213A1 (de) * 1991-09-26 1993-03-31 ZANUSSI GRANDI IMPIANTI S.p.A. Überwachungseinrichtung für wasch- und spülprogrammgesteuerte Geschirrspülmaschine
EP0569733A1 (de) * 1992-05-12 1993-11-18 AEG Hausgeräte GmbH Geschirrspülmaschine
US5722263A (en) * 1995-01-12 1998-03-03 Electrolux Zanussi Elettrodomestici Washing machine with dynamic water inlet control arrangement
US6551414B2 (en) * 2001-01-19 2003-04-22 U.S. Chemical Corporation Automatic system and method for removing mineral deposits from a dishwasher
CN100584264C (zh) * 2004-01-23 2010-01-27 Bsh博施及西门子家用器具有限公司 液体导引式的家用电器

Also Published As

Publication number Publication date
IT8345703A0 (it) 1983-02-14
EP0118719B1 (de) 1986-08-06
DE3460404D1 (en) 1986-09-11
IT8345703A1 (it) 1984-08-14
IT1174941B (it) 1987-07-01
ATE21209T1 (de) 1986-08-15

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