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
  • A47L15/42—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
  • 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
  • A47L2401/09—Water level
• • 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
• • 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
  • A47L2501/02—Water discharge, e.g. opening or closure of discharge valve
• • 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
  • A47L2501/03—Water recirculation, e.g. control of distributing valves for redirection of water flow
• • 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

Definitions

• the invention relates to a method for detecting a fault of a measuring device for detecting the accumulated amount of water in the washing container of a program-controlled dishwasher with a circulation pump, with a sensor for detecting a necessary for the stable operation of the circulating pump minimum level N min , and with an evaluation circuit for processing the signals received by the measuring device and the level sensor, and with a device for limiting the volume flow flowing into the washing container.
• Example It is well-known in water-bearing household appliances to carry out the program to determine the amount of water required by measuring equipment and thereby determine.
• an impeller which in the water supply one of Applicant's manufactured and marketed dishwasher G 892-4 SCi PLUS is arranged and from there emits electrical impulses to the program control, from the Volumetric flow of the incoming water are dependent. Due to a terminal or Grinding the impeller counter in its storage may cause malfunction in the metering come. In the aforementioned dishwashers is therefore at the beginning of the Water inlet checked whether the impeller emits pulses. This can only be one complete failure can be detected. An error resulting from the delivery of too little Counter impulses in relation to the amount of water recorded makes noticeable, can not be recognized.
• the water intake amount regulated by a so-called baffle plate in the solenoid valve limits a water pressure of 1 bar, the flow rate to about 5 liters per minute (depending on Opening cross-section).
• a second level sensor can be detected, which detects the achievement of an overflow level and then an in the control integrated evaluation circuit closes the solenoid valve.
• a disadvantage of the baffle plate is that it only works at a water pressure of 1 bar. At lower Pressure conditions in the water supply and simultaneous defect of the impeller counter the latter can not be recognized and an amount of water flows into the washing container, which is too high and therefore increased use of water and at worst the overflow the result of the machine.
• DE 101 15 101 C1 shows a method for detecting / correcting the filling water quantity a washing machine, whereby both filling time, and filling level and filling water quantity detected become. It is not specified how the filling water quantity is detected.
• DE 33 29 345 A1 also describes a method for measuring quantities of water, wherein the flow rate of the water inlet is determined by the time to enema a Reference amount of water (which is detected by a level sensor) is determined.
• the invention thus raises the problem of a method of the type mentioned in which also a fault in the measuring device for detecting the accrued Quantity of water is detected, which does not result in their complete failure.
• the to carry The process suitable dishwashing machine has in a known manner Housing in which a front closable by a door washing container with a drain pan is arranged.
• the door is at its bottom-side section around a horizontally extending Axis pivotally mounted on the device body.
• baskets present, which are associated with spray arms for cleaning the abandoned dishes.
• the Supply of the spray arm with rinsing liquid via a circulation pump. This is becoming Beginning of various program sections via a supply line water to the rinse tank fed to the end of this program sections, the emptying of the drain pan via a drain pump.
• the setting of the individual wash programs is the user through various operating and display elements allows the implementation of this Programs is controlled by a program controller, preferably a Microprocessor control is used.
• the supply line can be opened by means of a solenoid valve by supplying power from the microprocessor control, in the de-energized state, the solenoid valve and thus the supply line is closed.
• a timer runs in the microprocessor control and measures the time during which power is supplied. This time is referred to below as filling time t.
• In the supply line is also arranged as a measuring device for detecting the accumulated amount of water an impeller. This gives pulses to the microprocessor control, the number of which are proportional to the volume flow passing through the line, so that the control of the number of pulses with a known cross-section can determine the amount of water introduced, hereinafter referred to as V i .
• the drain pan is associated with a level sensor, with which a so-called minimum level N min can be detected, which is required for a stable running of the circulating pump.
• the level sensor may be designed as a pressure switch, which is arranged in the line behind the circulation pump and is actuated when pumping water. Alternatively, the speed or other control parameters of the circulation pump can be evaluated, since these change depending on the level.
• the measured variables of the timer, the vane counter and the output of the level sensor are processed in the microprocessor control by an integrated evaluation circuit, to detect an error in the detection of the accumulated amount of water in the washing to be able to.
• the solenoid valve is opened until the impeller counter has sensed a predetermined amount of water V 1 , for example 1 liter. As described above, the filling time t required for this water inlet is measured. If the filling time is below a predetermined minimum time t N , the evaluation circuit detects that there is neither a defect in the impeller counter nor too low a line pressure below 1 bar. There then takes place a quantity-controlled filling of the washing container, whereby a time control is superimposed for the purpose of securing.
• a second filling step is performed.
• the solenoid valve is opened until a subset has run into the washing, which is identified by the impeller or the microprocessor control as a predetermined amount V 2 .
• This quantity V 2 of about one liter corresponds to a level which is below the minimum level N min .
• the circulation pump is switched on for level detection. If the pressure switch switches stable, ie over a longer period of time, then the evaluation circuit detects that the amount of water actually in the rinsing tank is greater than that sensed by the vane wheel meter and thus the measurement result is definitely wrong. The running program is aborted and an error message is generated. If the pressure switch only switches shortly after switching on the circulation pump, the evaluation circuit detects that the impeller counter is intact and only the line pressure is below 1 bar. Then the program is continued and volume controlled filled the necessary to carry out the set program amount of water in the washing.
• a memory may be provided in the microprocessor control, in which the time required in the first filling step for filling the amount V 1 is stored. A renewed check only takes place if the respectively measured time t for the current filling step exceeds the stored value by a predetermined percentage of, for example, 15%.

Landscapes

• Engineering & Computer Science (AREA)
• Water Supply & Treatment (AREA)
• Washing And Drying Of Tableware (AREA)
• Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

Family

ID=34934961

Family Applications (1)

Country Status (5)

Cited By (6)

Families Citing this family (6)

Family Cites Families (6)

• 2004
  • 2004-05-05 DE DE102004022682A patent/DE102004022682B3/de not_active Expired - Fee Related
• 2005
  • 2005-04-11 ES ES05007847T patent/ES2300893T3/es not_active Expired - Lifetime
  • 2005-04-11 AT AT05007847T patent/ATE390076T1/de not_active IP Right Cessation
  • 2005-04-11 DE DE502005003411T patent/DE502005003411D1/de not_active Expired - Lifetime
  • 2005-04-11 PL PL05007847T patent/PL1593335T3/pl unknown
  • 2005-04-11 EP EP05007847A patent/EP1593335B1/fr not_active Expired - Lifetime

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