EP3150100A1 - Geschirrspüler mit beladungsschätzer - Google Patents

Geschirrspüler mit beladungsschätzer Download PDF

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Publication number
EP3150100A1
EP3150100A1 EP15425080.7A EP15425080A EP3150100A1 EP 3150100 A1 EP3150100 A1 EP 3150100A1 EP 15425080 A EP15425080 A EP 15425080A EP 3150100 A1 EP3150100 A1 EP 3150100A1
Authority
EP
European Patent Office
Prior art keywords
parameter
water
determining
dishwasher
estimate
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.)
Withdrawn
Application number
EP15425080.7A
Other languages
English (en)
French (fr)
Inventor
Giacomo Marvardi
Valter Battioli
Mario Lippera
Marco Wilhelmus Gerhardus Ten Bok
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 EMEA SpA
Original Assignee
Whirlpool EMEA 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 Whirlpool EMEA SpA filed Critical Whirlpool EMEA SpA
Priority to EP15425080.7A priority Critical patent/EP3150100A1/de
Publication of EP3150100A1 publication Critical patent/EP3150100A1/de
Withdrawn legal-status Critical Current

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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
    • A47L15/0047—Energy or water consumption, e.g. by saving energy or water
    • 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
    • A47L15/4295—Arrangements for detecting or measuring the condition of the crockery or tableware, e.g. nature or quantity
    • 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
    • A47L2401/04—Crockery or tableware details, e.g. material, quantity, condition
    • 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
    • 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
    • A47L2401/12—Water temperature
    • 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
    • A47L2401/20—Time, e.g. elapsed operating time
    • 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
    • A47L2401/30—Variation of electrical, magnetical or optical quantities
    • 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
    • A47L2501/30—Regulation of machine operational steps within the washing process, e.g. performing an additional rinsing phase, shortening or stopping of the drying phase, washing at decreased noise operation conditions

Definitions

  • the present invention relates to a dishwasher.
  • the present invention relates to a dishwasher equipped with a load estimator.
  • the invention further relates to a method for estimating the load of a dishwasher.
  • the wash program can thus be adjusted so as to, on the one hand, attain satisfactory results in terms of crockery washing and, on the other hand, keep the machine consumption under control.
  • a basic idea of the present invention is to estimate the load inside the dishwasher at least on the basis of a wash water heating speed and of a difference between a nominal value and an actual value of a parameter associated with the heating element used for heating the water.
  • the water heating speed is used for determining a first basic parameter, which takes into account the thermal interaction between the wash water and the crockery loaded in the machine (in brief: the higher the load, the higher the "cold" mass that will interact with the water and reduce the heating speed thereof), and, considering the non-ideal conditions of the heating element, a suitable correction is applied to the value, which would otherwise be determined only according to the first parameter.
  • a dishwasher comprises:
  • said processing unit is configured for setting operating parameters of said dishwasher as a function of said estimate.
  • said heating element comprises an electric resistor, said characteristic parameter being in particular an electric parameter of said electric resistor.
  • said processing unit is configured for controlling a stabilization step prior to the detection of the water temperature, which step is necessary for determining said load estimate.
  • said processing unit is further configured for: determining a third parameter representative of a difference between a nominal value and an actual value of a power voltage supplied to said dishwasher; determining said estimate also as a function of said third parameter.
  • said processing unit is configured for:
  • said compartment comprises:
  • the water circulates through said upper sprayer without circulating through said lower sprayer.
  • said processing unit is configured for:
  • a method for estimating the load in a dishwasher comprises:
  • reference numeral 1 designates as a whole a dishwasher according to the present invention.
  • the dishwasher 1 comprises, first of all, a compartment 10 for containing a load of crockery.
  • one or more racks and baskets can be placed for positioning the crockery to be washed.
  • the compartment 10 comprises an upper portion 11, associated with a respective upper sprayer 12, and a lower portion 13, associated with a respective lower sprayer 14.
  • water is sprayed into the compartment 10 through the sprayers 12, 14.
  • the water sprayed by the upper sprayer 12 typically hits both the crockery in the upper portion 11 and the crockery in the lower portion 13.
  • the dishwasher 1 is provided, in a per se known manner, with a tub 20 that contains the water used for washing the crockery arranged in the compartment 10.
  • the tub 20 can be positioned at a bottom wall of the compartment 10, i.e. the wall that delimits the bottom of the lower portion 13.
  • the tub 20 collects the water sprayed by the sprayers 12, 14, which is then recirculated.
  • the dishwasher 1 When the dishwasher 1 is in operation, the water contained in the tub 20 is made to circulate within the compartment 10 through the sprayers 12, 14, thus washing the crockery loaded in the compartment 10.
  • the dishwasher 1 further comprises a heating element 30 adapted to heat the wash water.
  • the heating element is associated with the tub 20.
  • the heating element 30 may be immersed in the tub 20.
  • the heating element 30 is an electric resistor.
  • the heating element may have a power output in the range of 1,500W to 2,000W.
  • the dishwasher 1 further comprises a sensor 40 adapted to detect a main parameter MP representative of the temperature of the wash water.
  • the sensor 40 may be associated with the tub 20 and, conveniently, may be immersed therein.
  • the senor 40 may be a negative temperature coefficient (NTC) resistor.
  • NTC negative temperature coefficient
  • the main parameter MP which is directly detected is the electric resistance of the component; based on a function and/or a preset table, the temperature of the water is then indirectly determined.
  • the value made available by the NTC resistor is typically in analogue format, and is converted into digital format prior to being suitably processed.
  • the dishwasher 1 can carry out wash cycles aimed at washing the crockery loaded in the compartment 10.
  • a control and management printed circuit board is conveniently included for controlling the various elements in order to execute the different steps of the work programs.
  • Said electronic board may comprise, or coincide or be associated with, the processing unit 50, which is schematically shown in Figure 1 .
  • the processing unit 50 is configured for determining an estimate X of the load contained in the compartment 10.
  • the processing unit 50 can estimate the total weight of the crockery loaded in the compartment 10.
  • Fig. 2 The process carried out for achieving the estimate of the load in the dishwasher 1 is diagrammatically shown in Fig. 2 .
  • a given quantity of water is loaded into the tub 20 (step A).
  • a quantity of water comprised between 3 and 6 litres may be loaded; for example, such quantity may be approx. 4 litres.
  • the water temperature is substantially constant and virtually coincides with the temperature of the mains water.
  • the water temperature is then advantageously increased by the heating element 30 as the water circulates within the compartment 10 (step B).
  • both the upper sprayer 12 and the lower sprayer 14 are used in this step, in particular in an alternate manner (when one sprayer is used, the other remains idle).
  • step C When the sensor 40 detects a preset temperature (e.g. between approx. 34°C and approx. 37°C), the so-called stabilization step begins (step C).
  • a preset temperature e.g. between approx. 34°C and approx. 37°C
  • the heating element 30 is kept on. Therefore, the water temperature will gradually keep rising.
  • the loaded water will have the possibility of interacting with all the crockery loaded in the compartment 10.
  • the stabilization step is particularly advantageous because it has been experimentally verified that, at the transitions from one sprayer to the other, an irregular trend of the temperature detected by the sensor 40 can be observed. This may lead to unreliable detections, resulting in a less accurate load estimate. On the contrary, the stabilization step is useful because the machine will wait for the sensor 40 to be able to provide correct and accurate temperature readings.
  • the sensor 40 detects a preset basic temperature (e.g. between approx. 38°C and approx. 41°C)
  • the actual analysis begins, which is aimed at determining the estimate X of the load in the dishwasher 1 (step D).
  • the heating element 30 is kept on.
  • the analysis step ends when the sensor 40 detects a target temperature, e.g. between 43°C and 46°c.
  • the processing unit 1 will determine a first parameter P1 representative of a wash water heating speed.
  • the processing unit 50 is configured for:
  • the first parameter P1 may advantageously coincide with the time t necessary for the water to cover the temperature range TMP.
  • the processing unit 50 is configured for: setting a reference time interval; measuring the water temperature variation that has occurred within said reference time interval.
  • the upper sprayer 12 is used, without using the lower sprayer 14.
  • the processing unit 50 is further configured for determining a second parameter P2 representative of a difference between a nominal value and an actual value of a characteristic parameter of the heating element 30.
  • the heating element 30 may comprise or consist of an electric resistor; the characteristic parameter may thus be an electric parameter of said electric resistor, such as power or resistance.
  • the second parameter P2 is useful for taking into account the fact that the heating element 30 may have actual characteristics (resistance, power) which differ from the nominal ones.
  • the nominal value of the electric power of the heating element 30 may be comprised between 1,500W and 2,000W.
  • said nominal value may be 1,800W.
  • the estimate X can thus be calculated as a function of the first parameter P1 and of the second parameter P2.
  • the sum of the values of P1 and P2 can be compared with appropriate threshold values, e.g. defining a comparison table, which relate possible values of said sum to corresponding values of the estimate X.
  • a third parameter P3 is determined, which is representative of a difference between a nominal value and an actual value of a power voltage supplied to the dishwasher 1.
  • the estimate X is determined also as a function of the third parameter P3.
  • the third parameter P3 may be calculated as follows:
  • the nominal power voltage value may be set to 230 V.
  • the average power voltage value is calculated over the time interval corresponding to the analysis step (step D).
  • the value of the estimate X can thus be determined as a function of the sum of the parameters P1, P2, P3, based on appropriate preset threshold values/tables.
  • the sum of the parameters P1, P2, and possibly the third parameter P3, can be imagined as a "normalized time” expressing the water heating time, appropriately corrected (i.e. "normalized") in the light of further factors that are taken into account.
  • three normalized time intervals may be defined, each one corresponding to a different load estimate X: Normalized time (s) Load (kg) ⁇ 95 0-9 95-120 9-18 >120 18-27
  • the operating parameters of the dishwasher 1 can be adjusted accordingly.
  • This adjustment can be made by selecting a work program among a plurality of preset programs, or by modifying the values of the individual parameters that define a particular program.
  • a water turbidity analysis is carried out at the end of the analysis period for load estimation.
  • the heating element is kept on (step E) in order to further increase the temperature.
  • step F the water turbidity analysis (step F) is carried out in a per se known manner, which for this reason will not be described any further.
  • the work program and/or the values of specific operating parameters can then be adjusted as a function of the load estimate X and as a function of the turbidity of the water.
  • a work program of the dishwasher 1 comprises:
  • the work program may comprise a further holding step ( Figures 4c-4d ; 5c , 5d ; 6c, 6d ), separated from the previous holding step by a short heating ramp.
  • the work program may comprise at least one rinsing step (the so-called cold rinse), interposed between the first discharge step and the second loading step.
  • cold rinse water is loaded which is not heated, the sprayers are activated, and, after a predefined time, the water is discharged ( Figures 4c-4d ; 5c , 5d ; 6c, 6d ).
  • the work program may comprise a second cold rinse ( Figures 4d , 5d , 6d ), similar to the first one and carried out immediately after it, i.e. before the hot rinse.
  • the turbidity values can be divided, for example, into four ranges.
  • a table like the one shown below merely by way of explanatory example can be stored into a memory register associated with the processing unit 50:
  • Figure 2 essentially represents the initial part of each cycle shown in Figures 4a-4d , 5a-5d , 6a-6d . Quantities are shown on the axes in a different scale, and the inclination of the graph is different from that of the graphs shown in Figures 4a-4d , 5a-5d , 6a-6d .
  • the cycle may undergo one or more of the following changes:
  • the cycle may undergo one or more of the following changes: increased quantity of water loaded during one or more loading steps; longer duration of the holding step(s).
  • the operating parameters may also be adjusted without “discretizing" the values of the estimate X and/or the turbidity values: for each point in the estimate X / turbidity plane (i.e. for each pair of specific values of estimate X and turbidity), it is possible to determine a corresponding specific value of one or more operating parameters of the dishwasher 1.
  • Figures 3a-3b show a flow chart representative of the operations carried out in one embodiment of the invention.
  • step F2 water is loaded into the tub 20 (step F2).
  • step F3 The water temperature is then checked (step F3) : if said temperature, which is preferably detected by the sensor 40, turns out to be higher than the preset temperature that defines the beginning of the stabilization step, then no load analysis will be carried out, and a program will be set by default which is suitable for a maximum load.
  • step F4 the heating element 30 will be activated (step F4) and a generic wash cycle will be started (step F5).
  • a check will then follow to verify if a predefined timeout has expired (step F6).
  • a wash program for a maximum load will be set, and a heating timeout routine will be executed (step F16).
  • step F7 a further check of the water temperature will be made.
  • step F8 If the water temperature exceeds the preset temperature for the start of the stabilization step, then a wash will start by using the upper sprayer 12 only (step F8).
  • a preset timer will then be checked (step F9).
  • step F16 If the timeout has expired, then the already described step F16 will be carried out.
  • step F10 If the timeout has not expired, then the water temperature will be checked (step F10).
  • the process will go back to the washing step F8, using the upper sprayer 12 only.
  • step F11 If the water temperature has reached the basic temperature, then the actual analysis step will be started by reading the power voltage (step F11).
  • step F12 a further check is carried out on a timeout similar to the previous ones.
  • the temperature is checked at step F13.
  • step F11 If the temperature remains lower than the target temperature (which defines the end of the analysis step), then the process will go back to reading the power voltage (step F11).
  • step F14 If the water temperature has reached the target temperature, then the analysis will be complete and the load estimate X can be calculated (step F14).
  • the wash can continue (step F15).
  • the invention achieves significant advantages.
  • the dishwasher according to the invention can estimate in an accurate and reliable manner the load with which the machine has to operate.
  • the invention also allows optimizing the energy consumption of the dishwasher by exploiting the accurate estimate of the load contained therein.
  • the invention provides a more accurate estimate of the cycle time.

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  • Washing And Drying Of Tableware (AREA)
EP15425080.7A 2015-10-01 2015-10-01 Geschirrspüler mit beladungsschätzer Withdrawn EP3150100A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15425080.7A EP3150100A1 (de) 2015-10-01 2015-10-01 Geschirrspüler mit beladungsschätzer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15425080.7A EP3150100A1 (de) 2015-10-01 2015-10-01 Geschirrspüler mit beladungsschätzer

Publications (1)

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EP3150100A1 true EP3150100A1 (de) 2017-04-05

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EP15425080.7A Withdrawn EP3150100A1 (de) 2015-10-01 2015-10-01 Geschirrspüler mit beladungsschätzer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4056098A1 (de) * 2021-03-10 2022-09-14 Vestel Elektronik Sanayi ve Ticaret A.S. Geschirrspülmaschine und verfahren zum betrieb einer geschirrspülmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2574645A1 (fr) * 1984-12-14 1986-06-20 Esswein Sa Procede de determination de la charge en vaisselle, et lave-vaisselle mettant en oeuvre un tel procede
JP3141463B2 (ja) * 1991-11-20 2001-03-05 松下電器産業株式会社 食器洗い機
US6622754B1 (en) * 2001-12-19 2003-09-23 Whirlpool Corporation Load-based dishwashing cycle
WO2004047608A1 (de) * 2002-11-27 2004-06-10 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur erkennung der geschirrmenge im spülbehälter einer geschirrspülmaschine sowie geschirrspülmaschine zur durchführung eines solchen verfahrens
JP2005052216A (ja) * 2003-08-06 2005-03-03 Hitachi Home & Life Solutions Inc 食器洗い機
EP2599425A1 (de) * 2010-07-29 2013-06-05 Panasonic Corporation Geschirrspüler

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2574645A1 (fr) * 1984-12-14 1986-06-20 Esswein Sa Procede de determination de la charge en vaisselle, et lave-vaisselle mettant en oeuvre un tel procede
JP3141463B2 (ja) * 1991-11-20 2001-03-05 松下電器産業株式会社 食器洗い機
US6622754B1 (en) * 2001-12-19 2003-09-23 Whirlpool Corporation Load-based dishwashing cycle
WO2004047608A1 (de) * 2002-11-27 2004-06-10 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur erkennung der geschirrmenge im spülbehälter einer geschirrspülmaschine sowie geschirrspülmaschine zur durchführung eines solchen verfahrens
JP2005052216A (ja) * 2003-08-06 2005-03-03 Hitachi Home & Life Solutions Inc 食器洗い機
EP2599425A1 (de) * 2010-07-29 2013-06-05 Panasonic Corporation Geschirrspüler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4056098A1 (de) * 2021-03-10 2022-09-14 Vestel Elektronik Sanayi ve Ticaret A.S. Geschirrspülmaschine und verfahren zum betrieb einer geschirrspülmaschine

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