EP1778068A1 - Dishwasher with pulse width modulation control - Google Patents

Dishwasher with pulse width modulation control

Info

Publication number
EP1778068A1
EP1778068A1 EP05805021A EP05805021A EP1778068A1 EP 1778068 A1 EP1778068 A1 EP 1778068A1 EP 05805021 A EP05805021 A EP 05805021A EP 05805021 A EP05805021 A EP 05805021A EP 1778068 A1 EP1778068 A1 EP 1778068A1
Authority
EP
European Patent Office
Prior art keywords
water
washing
dishwasher
standard deviation
pwm
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
EP05805021A
Other languages
German (de)
French (fr)
Other versions
EP1778068B1 (en
Inventor
Orhan Arcelik Anonim Sirketi DIRIL
Kerem Arcelik Anonim Sirketi ERENAY
Alper Arcelik Anonim Sirketi BAYKUT
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.)
Arcelik AS
Original Assignee
Arcelik AS
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Filing date
Publication date
Application filed by Arcelik AS filed Critical Arcelik AS
Publication of EP1778068A1 publication Critical patent/EP1778068A1/en
Application granted granted Critical
Publication of EP1778068B1 publication Critical patent/EP1778068B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A47L15/0049—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
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • 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
    • 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

  • This invention relates to a dishwasher wherein the washing performance is improved.
  • the washing performance of dishwashers can be adversely affected according to conditions of use like the amount of water taken into the washing chamber, the amount of load, soil level of load and viscosity change of water in relation to the kind of soil, clogging of filters by the high density of soil, increase of foaming or misuse. It is attempted to improve the washing performance by the use of optimum amounts of water and electrical energy through appropriate washing algorithms obtained by data compiled by detecting the afore mentioned adverse conditions.
  • the washing operation in a dishwasher is determined by the way the circulation pump operates.
  • the washing performance is improved by the circulation pump functioning at variable r.p.m.'s and by the continuity of circulation with relative speeds conforming to conditions.
  • the water circulation and the spraying system in the dishwasher can lead to excess water intake and high speed circulation depending on the amount of load, the distribution of load, the amount of water intake and the rotation speed of pump, thus resulting in high water consumption together with more use of electric energy both for the heating and the circulation of water.
  • the pump In order to provide uninterrupted circulation, the pump needs sufficient amount of water with respect to the speed employed.
  • uninterrupted circulation is applied with sufficient amount of water, the difference in the input-output pressure of the pump, the power required for constant pump drive, the output power of the motor that drives the pump and the current drawn from the network by the pump motor remains constant. Lack of sufficient amount of water for the continuity of circulation results in a pressure difference between pump input-output thus leading to change in the power that should be drawn from the drive motor.
  • the current drawn from the power supply network by the drive motor demonstrates a likewise change.
  • This operation conditions can be detected by measuring the operation conditions, motor current, number of revolutions or pump pressure, however, the need arises for an additional device, sensor or electronic evaluation equipment for the afore mentioned measurements, thus leading to a rise in the cost of the commodity.
  • German Patent No. DE2646383 describes the case wherein water is taken in up to a maximum level following the pressure measurement by a pressure detector placed at pump outlet and with repeated inlet and discharge of water it is attempted to remove the foam and soil.
  • the aim of the present invention is to realize a dishwasher wherein the washing performance is improved without the need for extra measuring devices or sensors by detecting the adverse elements affecting the washing performance through the ob ⁇ servations carried out on the continuous circulation of water.
  • Figure 2 A voltage - time graph showing the adjustment of the input voltage to supply the motor in a dishwasher.
  • FIG. 3 to 6 The PWM - time graphs illustrating the state of the dishwasher when the amount of water in the washing tank increases in consecutive phases.
  • Figure 7 The PWM - time graphs illustrating the state of the dishwasher when washing water does not return as the consequence of being held on the load or when the load is increased in a dishwasher.
  • Figure 8 The PWM - time graph illustrating the state of the dishwasher when there is foaming of washing water.
  • Figure 9 The PWM - time graph illustrating the state when there is clogging of the filter in a dishwaher.
  • Figure 10- The PWM - time graph illustrating the state when the viscosity of the washing water in a dishwasher increases.
  • the said dishwasher(l) comprises of a washing tank (2) wherein dishware is placed, a washing chamber (3) positioned below the washing tank (2) to collect water in the washing tank (2) during the washing process, a circulation pump (4) which transfers water in the washing chamber (3) onto the dishware in the washing tank (2) thus attaining circulation, a variable speed DC (direct current) motor (5), preferably brushless, that drives the circulation pump (4), a drain pump (6) that discharges the water collected in the washing tub (3) to the outside of the dishwasher (1) upon completion of the washing process, preferably PI (proportional integral) or PID (proportional integral derivative) type speed controller (7) which maintains the motor speed at a determined speed by comparing the real speed of the motor with a preset reference speed , a control card (8) which observes the modulations of PWM dutycycle rate determined by the PWM (pulse width modulation) drives of the output signals of speed controller (7) in relation to time and a control card (8) that adjusts motor (5) input voltage using standard deviation and mean average information
  • the speed controller (7) constantly compares the real speed of the motor (5) with the reference speed and tries to adjust the motor speed to the reference level.
  • the motor (5) chops the input voltage (V ), dc applies V and V voltages in T and T periods relatively, reaching the phase control switch with square waving, wherein the transformed voltage (V app ) reaches the desired value and reaches the motor (5) via the motor (5) phase control switch .
  • the output signal of speed controller (7) is generated as PWM (pulse width modulation) control signals.
  • the control card (8) starting out with PWM signals reaches the variation data of T /(T +T ) ratio with respect to time. T /(T +T ) ratio is denoted as PWM (pulse width modulation) dutycycle.
  • the PWM dutycycle is perceived as a graphic that changes with time according to the varying power requirement of the motor (5), the PWM dutycycle generates different profiles that express different operating conditions of the motor (5) confronted with various load conditions.
  • the input voltage (V dc ) is controlled by a low value PWM dutycycle, the applied voltage (V app ) to the motor (5) is low, whereas if controlled by a high value PWM dutycycle, the applied voltage (V app ) to the motor (5) is high.
  • V dc *PWM dutycycle R * I + E where it can be seen that the PWM dutycycle is directly proportional to current (I) .
  • the circulation pump (4) gradually needs more power to pump the water (Figure 10).
  • the circulation pump (4) is operated at a low rotation speed, if no improvement is observed in PWM dutycycle, then it is decided that washing water is not suitable and washing water is drained and clean water is taken in.
  • the average and standard deviations of PWM dutycycle are observed by the control card (8) for detecting and solving problems like the amount of water required for continuity of circulation, correct amount of water intake relative to load, foaming, increase in viscosity, clogging of filter, and due to precise measurements obtained and easy inter ⁇ pretation of observed data, there is no need for extra measurement devices for detecting the input current (I) drawn by the motor (5), the rotation moment (M) executed by the motor shaft and the pressure (P) of the circulation pump (4).

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

This invention relates to a dishwasher (1) where the signals generated by the speed controller (7) of the variable speed motor (5) that drives the circulation pump (4) are observed by the control card (8) and the motor (5) input voltage is adjusted and where elements that adversely affect washing performance such as filter clogging, foaming, increase in viscocity or inappropriate amount of water in washing chamber (3) are detected. Pulse width modulation signals (PWM" constitute the output signals of the speed controller (7).

Description

Description A DISHWASHER
[001] This invention relates to a dishwasher wherein the washing performance is improved.
[002] The washing performance of dishwashers can be adversely affected according to conditions of use like the amount of water taken into the washing chamber, the amount of load, soil level of load and viscosity change of water in relation to the kind of soil, clogging of filters by the high density of soil, increase of foaming or misuse. It is attempted to improve the washing performance by the use of optimum amounts of water and electrical energy through appropriate washing algorithms obtained by data compiled by detecting the afore mentioned adverse conditions. Basically, the washing operation in a dishwasher is determined by the way the circulation pump operates. The washing performance is improved by the circulation pump functioning at variable r.p.m.'s and by the continuity of circulation with relative speeds conforming to conditions. The water circulation and the spraying system in the dishwasher can lead to excess water intake and high speed circulation depending on the amount of load, the distribution of load, the amount of water intake and the rotation speed of pump, thus resulting in high water consumption together with more use of electric energy both for the heating and the circulation of water. In order to provide uninterrupted circulation, the pump needs sufficient amount of water with respect to the speed employed. When uninterrupted circulation is applied with sufficient amount of water, the difference in the input-output pressure of the pump, the power required for constant pump drive, the output power of the motor that drives the pump and the current drawn from the network by the pump motor remains constant. Lack of sufficient amount of water for the continuity of circulation results in a pressure difference between pump input-output thus leading to change in the power that should be drawn from the drive motor. The current drawn from the power supply network by the drive motor demonstrates a likewise change. This operation conditions can be detected by measuring the operation conditions, motor current, number of revolutions or pump pressure, however, the need arises for an additional device, sensor or electronic evaluation equipment for the afore mentioned measurements, thus leading to a rise in the cost of the commodity.
[003] In the European Patent No. EPOl 18719, a transducer is described which generates an output signal proportional to the outlet pressure of the circulation pump. When output signal amplitude of the transducer decreases below a preset value, the control unit responsive to variations of said output signals causes the water inlet valve to be closed stopping the water entrance into the dishwashing machine .
[004] In the European Patent application No. EP0326893, a dishwasher is described wherein the water inlet valve is controlled with the help of the data obtained from the measurements of the capacitor voltage , rotation speed of the electric motor, pump pressure, flow rate in the spraying system, the noise level and the vibrations of the machine in order to provide a constant measuring value of uniform water levels thereafter water reaches a level above the minimum in the water chamber.
[005] In the German Patent application No. DE 4418721, in a dishwashing machine wherein the washing water can not maintain a uniform circulation, the revolutions of the pomp motor and the current fluctuations are recorded and the changes in the phase angles of the motor are assessed, thus keeping the pump motor at a preset constant speed.
[006] In the German Patent No. DE2013716 , a description is given wherein a pressure detector placed at the pump outlet detects the clogged filter and when necessary solves the problem with repeated intake and discharge of water.
[007] The German Patent No. DE2646383 describes the case wherein water is taken in up to a maximum level following the pressure measurement by a pressure detector placed at pump outlet and with repeated inlet and discharge of water it is attempted to remove the foam and soil.
[008] In the German Patent No. DE4435096, the pressure detectors and the fluid consistency measuring devices are used concurrently to observe the condition of the washing water and, parametric washing programs are employed according to the r esults obtained in the observations.
[009] In the German Patent No. DE4400877, the water levels in the washing chamber and in front of the pump suction are compared to observe the clogging condition of the filter.
[010] The aim of the present invention is to realize a dishwasher wherein the washing performance is improved without the need for extra measuring devices or sensors by detecting the adverse elements affecting the washing performance through the ob¬ servations carried out on the continuous circulation of water.
[011] The dishwasher realized in order to attain above mentioned aim of the present invention is illustrated in the attached figures, where:
[012] Figure 1 -A schematic view of a dishwasher
[013] Figure 2 - A voltage - time graph showing the adjustment of the input voltage to supply the motor in a dishwasher.
[014] Figure 3 to 6 - The PWM - time graphs illustrating the state of the dishwasher when the amount of water in the washing tank increases in consecutive phases.
[015] Figure 7 - The PWM - time graphs illustrating the state of the dishwasher when washing water does not return as the consequence of being held on the load or when the load is increased in a dishwasher. [016] Figure 8 - The PWM - time graph illustrating the state of the dishwasher when there is foaming of washing water. [017] Figure 9 - The PWM - time graph illustrating the state when there is clogging of the filter in a dishwaher. [018] Figure 10- The PWM - time graph illustrating the state when the viscosity of the washing water in a dishwasher increases. [019] Elements shown in the figures are numbered individually as follows:
1. Dishwasher
2. Washing tank
3. Washing chamber
4. Circulation pump
5. Motor
6. Discharge pump
7. Speed controller
8. Control card
[020] The said dishwasher(l) comprises of a washing tank (2) wherein dishware is placed, a washing chamber (3) positioned below the washing tank (2) to collect water in the washing tank (2) during the washing process, a circulation pump (4) which transfers water in the washing chamber (3) onto the dishware in the washing tank (2) thus attaining circulation, a variable speed DC (direct current) motor (5), preferably brushless, that drives the circulation pump (4), a drain pump (6) that discharges the water collected in the washing tub (3) to the outside of the dishwasher (1) upon completion of the washing process, preferably PI (proportional integral) or PID (proportional integral derivative) type speed controller (7) which maintains the motor speed at a determined speed by comparing the real speed of the motor with a preset reference speed , a control card (8) which observes the modulations of PWM dutycycle rate determined by the PWM (pulse width modulation) drives of the output signals of speed controller (7) in relation to time and a control card (8) that adjusts motor (5) input voltage using standard deviation and mean average information to determine which of the elements is adversely affecting the washing process like water holding of the load, increase in load, clogging of the filter, increase in viscocity, foaming or inap¬ propriate amount of water in the washing chamber (3).
[021] In cases where the circulation pump (4) is confronted with varying loads and the motor (5) that drives the circulation pump (4) is forced to operate in a different speed other than the preset one, the speed controller (7) constantly compares the real speed of the motor (5) with the reference speed and tries to adjust the motor speed to the reference level. In accomplishing this task, the motor (5) chops the input voltage (V ), dc applies V and V voltages in T and T periods relatively, reaching the phase control switch with square waving, wherein the transformed voltage (V app ) reaches the desired value and reaches the motor (5) via the motor (5) phase control switch . While the input voltage (V dc ) is transformed in the speed controller (7) in the above mentioned manner, and the output voltage (V app ) is applied to the motor (5), the output signal of speed controller (7) is generated as PWM (pulse width modulation) control signals. The control card (8) starting out with PWM signals reaches the variation data of T /(T +T ) ratio with respect to time. T /(T +T ) ratio is denoted as PWM (pulse width modulation) dutycycle. The PWM dutycycle is perceived as a graphic that changes with time according to the varying power requirement of the motor (5), the PWM dutycycle generates different profiles that express different operating conditions of the motor (5) confronted with various load conditions. [022] When the input voltage (V dc ) is applied in the dishwasher(l) of the present invention, the rpm of motor (5) can be maintained at a constant speed, wherein the change of PWM dutycycle means a change in the desired power of the motor (5), the voltage applied to the motor (V app .) changes in direct proportion with PWM dutycycle that increases or decreases according to the required power (V . =PWM dutycycle*V app dc ). For example, when the input voltage (V dc ) is controlled by a low value PWM dutycycle, the applied voltage (V app ) to the motor (5) is low, whereas if controlled by a high value PWM dutycycle, the applied voltage (V app ) to the motor (5) is high.
[023] Since the voltage applied (V app ) to the motor (5) controlled by PWM dutycycle is in direct proportion with the input current (I) that the motor uses, the PWM dutycycle also increases or decreases in direct proportion to current (I), when an information on current (I) is needed to detect a problem, there is no need to measure the input current. The motor's winding resistance (R) and the induced voltage (E) kept constant, for the applied voltage (V app ) to the motor we can write :
[024] From equation V app = R*I + E
[025] V dc *PWM dutycycle = R * I + E where it can be seen that the PWM dutycycle is directly proportional to current (I) .
[026] Furthermore, since rotational moment (M) of the motor shaft and the pressure (P) of the circulation pump (4) are directly proportional to the input current (I), PWM dutycycle is also directly proportional to moment (M) and pressure (P). So with only the measurement of PWM dutycycle, it is possible to gather information on rotational moment (M) and pressure (P) without the need for measurement devices thereof.
[027] Even if the network voltage is above or under normal values, the averages and standard deviations of PWM dutycycle are evaluated in accordance to changing network voltage, consequently nonuniform network voltage is compensated, the elements adversely affecting the washing performance are detected.
[028] At the start, a minimum amount of water is taken into the washing chamber (3) by way of the control card (8) and the PWM dutycycle is being observed, then gradually increasing amounts of water is taken in, and observation of the PWM dutycycle goes on with each amount until reaching the amount (of water) where circulation pump (4) can operate without pumping air. Since there is no need for water intake in excess of the amount needed for satisfactory washing, water consumption is economized .
[029] For example while circulation is conducted with 3 liters of water, the average and standard deviation is low in the PWM dutycycle-time graph, and oscilations with long and uniform intervals are observed. In this case it is inferred that the amount of water intake in the washing chamber (3) is very low and it takes a long time for the water pumped by the circulation pump (4) to return and accumulate in the washing chamber (3) (Figure 3).
[030] When for example 3,7 liters is reached by continuing water intake into the washing chamber (3), both the average and standard deviation increases in the PWM dutycycle-time graph and oscilations are observed with short intervals. In this case, it is inferred that the amount of water intake into the washing chamber (3) is above minimum, nevertheless not enough. (Figure 4)
[031] When for example 3,85 liters is reached by continuing water intake into the washing chamber (3), the average increases and standard deviation decreases in the PWM dutycycle-time graph, and it is inferred that almost the ideal amount of water level has been reached (Figure 5).
[032] When, for example, an amount of 4 liters is reached by continuing water intake into the washing chamber (3), the average comes to normal and standard deviation nears to minimum in the PWM dutycycle-time graph, and it is inferred that the required amount of water level for washing has been reached (Figure 6).
[033] Even if there is enough water at the start, when PWM dutycycle oscilates with non¬ uniform intervals, and increase in standard deviation and decrease in average is observed, and some of the water pumped by the circulation pump (4) does not return to the washing chamber (3), the control card (8) detects the problem called "inverted bowl" with water collecting in the dishware or load size is increased during the washing process (Figure 7).
[034] When PWM dutycycle is normal in the beginning and then starts to oscilate with an increase in standard deviation and a decrease in average, which after a short while returns to normal upon intake of water to the washing chamber (3) and again starts to oscilate, the control card (8) detects that there is foaming in washing water and circulation pump (4) is pumping water mixed with air (Figure 8). When foaming is detected, the rotation speed of the circulation pump is decreased until standard deviation of PWM dutycycle comes down to a preset level, consequently the circulation pump (4) in the washing chamber (3) stays above suction level, and the circulation pump (4) can make enough water suction thus enabling the continuity of washing .
[035] When PWM dutycycle is normal in the beginning and then starts to oscilate with an increase in standard deviation and a decrease in average, then oscilation ends and standard deviation decreases again and continues with low average, the control card (8) detects that the filter is clogged and will not let water to return to the washing chamber
(3) (Figure 9). When clogging of the filter is detected, some water is taken into the dishwasher(l) and the rotation speed of the circulation pump (4) is decreased resuming normal washing process. If no improvement is noticed while observing the changes in PWM dutycycle, then it is decided that filter is not cleaned within normal circulation and the water is drained completely, clean water is taken in, the filter is washed by clean water and the water is discharged.
[036] When PWM dutycycle proceeds normally in the beginning, then starts to oscilate, with increasing standard deviation and average and after a while oscilation ends, standard deviation decreases again, and proceeds with high average, the control card (8) detects that there is viscosity increase of washing water and the circulation pump
(4) gradually needs more power to pump the water (Figure 10). For eliminating the problem after detection of viscosity increase in washing water, the circulation pump (4) is operated at a low rotation speed, if no improvement is observed in PWM dutycycle, then it is decided that washing water is not suitable and washing water is drained and clean water is taken in.
[037] In the dishwasher which is the object of the present invention, the average and standard deviations of PWM dutycycle are observed by the control card (8) for detecting and solving problems like the amount of water required for continuity of circulation, correct amount of water intake relative to load, foaming, increase in viscosity, clogging of filter, and due to precise measurements obtained and easy inter¬ pretation of observed data, there is no need for extra measurement devices for detecting the input current (I) drawn by the motor (5), the rotation moment (M) executed by the motor shaft and the pressure (P) of the circulation pump (4).

Claims

Claims
[001] A dishwasher (1), comprising a washing chamber (3) where water is collected during the washing process, a circulation pump (4) which executes circulation by transferring water onto the dishware in the washing tank (2), a variable speed motor (5) that drives the circulation pump (4), a speed controller (7) that keeps the motor speed at the preset level by comparing the real speed of the motor and a preset reference speed, and characterized by determining the elements adversely affecting the washing performance by using the data of standard deviation and average which is determined by PWM (pulse width modulation) signals that constitute the output signals of the speed controller (7),obtained through the observations of the PWM dutycycle changes with respect to time.
[002] A dishwasher (1) as in Claim 1, characterized by determining which factor such as increase in load, water holding of the load, clogging of filter, increase in viscocity, foaming or inappropriate amount of water in the washing chamber (3) is adversely affecting washing performance.
[003] A dishwasher (1) as in Claim 1 or 2, characterized by taking a minimum amount of water into washing chamber (3) at the start and beginning to observe PWM dutycycle, later continuing water intake with incremental amounts and while observing PWM dutycycle for each incremental level until the water amount where the circulation pump (4) will operate without pumping air is reached.
[004] A dishwasher (1) as in Claim 1 or 2, characterized by the observation that when the PWM dutycycle oscilates with non-uniform intervals and there is an increase in standard deviation and a decrease in mean average in the case of having sufficient water in the washing chamber (3), some of the water pumped by the circulation pump (4) collects in the dishware and does not return to the washing chamber, (3) or the load is increased during washing.
[005] A dishwasher (1) as in Claim 1 or 2 that is characterized by detecting foaming in washing water, when PWM dutycycle is normal at the beginning and then starts to oscilate and repetitive increases in standard deviation and decreases in averages are observed.
[006] A dishwasher (1) as in Claim 1 or 2 that is characterized by detecting that the filter is clogged if PWM dutycycle is observed normal at the beginning and then starts to oscilate with an increase in standard deviation and a decrease in average, then oscilation stops, standard deviation decreases again and continues with low average.
[007] A dishwasher (1) as in Claim 1 or 2 that is characterized by detecting viscosity increase of washing water when PWM dutycycle is observed normal at the beginning and then starts to oscilate with an increase in both standard deviation and average and then oscilation ends, standard deviation decreases again and continues with high average. A dishwasher (1) as in any of the above claims characterized by a control card
(8) that determines which of the elements is adversely affecting washing performance by observing the PWM dutycycle changes with respect to time, and using the data of standard deviation and (mean) average which is determined by PWM (pulse width modulation) signals that constitute the output signals of the speed controller (7).
EP05805021A 2004-07-21 2005-07-11 Dishwasher with pulse width modulation control Expired - Lifetime EP1778068B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200401786 2004-07-21
PCT/IB2005/052291 WO2006033027A1 (en) 2004-07-21 2005-07-11 Dishwasher with pulse width modulation control

Publications (2)

Publication Number Publication Date
EP1778068A1 true EP1778068A1 (en) 2007-05-02
EP1778068B1 EP1778068B1 (en) 2009-08-19

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EP05805021A Expired - Lifetime EP1778068B1 (en) 2004-07-21 2005-07-11 Dishwasher with pulse width modulation control

Country Status (6)

Country Link
EP (1) EP1778068B1 (en)
AT (1) ATE439795T1 (en)
DE (1) DE602005016124D1 (en)
ES (1) ES2330029T3 (en)
TR (1) TR200700213T1 (en)
WO (1) WO2006033027A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007056918B3 (en) * 2007-11-27 2009-04-30 BSH Bosch und Siemens Hausgeräte GmbH Method for controlling a wash cycle in a water-conducting household appliance
DE102008024543A1 (en) * 2008-05-21 2009-11-26 Premark Feg L.L.C., Wilmington Method for operating a dishwasher and dishwasher
DE102010027756A1 (en) 2010-04-14 2011-10-20 BSH Bosch und Siemens Hausgeräte GmbH Dishwasher with fault detection
DE102011075020A1 (en) * 2011-04-29 2012-10-31 BSH Bosch und Siemens Hausgeräte GmbH Dishwasher and method for operating a dishwasher
ITTO20111249A1 (en) * 2011-12-30 2013-07-01 Indesit Co Spa DISHWASHER AND METHOD FOR DETECTION OF A LOSS OF LIQUID FROM THIS DISHWASHER
ITTO20111248A1 (en) * 2011-12-30 2013-07-01 Indesit Co Spa DISHWASHER AND METHOD FOR DETECTING A FAILURE OF WATER INTO THE SAFE DISHWASHER
ITTO20111246A1 (en) * 2011-12-30 2013-07-01 Indesit Co Spa DISHWASHER AND METHOD FOR DETECTION OF FOAM IN THE SAFE DISHWASHER
ITTO20111247A1 (en) * 2011-12-30 2013-07-01 Indesit Co Spa DISHWASHER AND METHOD FOR DETECTION OF ONE OR MORE CONTAINERS POSITIONED WITH CONCAVITIES TOWARDS UPWARDS WITHIN THE ABOVE DISHWASHER
EP2609845B1 (en) * 2011-12-30 2018-06-27 Whirlpool EMEA S.p.A Dishwasher and method for detecting malfunctions thereof
US9220393B2 (en) 2012-09-13 2015-12-29 Whirlpool Corporation Dishwasher with controlled rotation of lower spray arm
DE102017101695A1 (en) 2017-01-30 2018-08-02 Ebm-Papst Mulfingen Gmbh & Co. Kg Apparatus and method for detecting filter clogging
US11642000B2 (en) 2018-08-29 2023-05-09 Vestel Elektronik Sanayi Ve Ticaret A.S. Dishwashing machine and method
DE102020208139A1 (en) * 2020-06-30 2021-12-30 BSH Hausgeräte GmbH Dishwasher, method for operating a dishwasher and computer program product

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4400877C2 (en) * 1994-01-14 1997-07-31 Aeg Hausgeraete Gmbh Process for the detection of soiled sieves in household dishwashers
DE4418721A1 (en) * 1994-05-28 1995-11-30 Licentia Gmbh Control process for domestic dishwasher pump
DE19630357A1 (en) * 1996-07-26 1998-02-05 Aweco Kunststofftech Geraete Water quantity control device for electric-pump operated dishwashers
IT1284821B1 (en) * 1996-09-26 1998-05-22 Bitron Spa ELECTRONIC CONTROL SYSTEM OF THE OPERATING CONDITION OF THE DISHWASHER MOTOR OF A DISHWASHER.
DE19736347A1 (en) * 1997-08-21 1999-02-25 Wunnibald Kunz Measuring appliance for use in dishwasher
KR100786059B1 (en) * 2000-12-01 2007-12-17 엘지전자 주식회사 Dehydration speed control method of drum washing machine
EP1211344B1 (en) * 2000-12-04 2004-08-04 Whirlpool Corporation Washing machine with a continous water level sensor
WO2002058225A1 (en) * 2001-01-04 2002-07-25 Aquadane Aps Method and an apparatus for the control of an electric motor and the use hereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006033027A1 *

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TR200700213T1 (en) 2007-04-24
ES2330029T3 (en) 2009-12-03
DE602005016124D1 (en) 2009-10-01
EP1778068B1 (en) 2009-08-19
WO2006033027A1 (en) 2006-03-30

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