EP3424398A1 - Procédé de fonctionnement d'un appareil électroménager à circulation d'eau à détermination de la durée de marche à vide d'une pompe améliorée et appareil électroménager correspondant - Google Patents

Procédé de fonctionnement d'un appareil électroménager à circulation d'eau à détermination de la durée de marche à vide d'une pompe améliorée et appareil électroménager correspondant Download PDF

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Publication number
EP3424398A1
EP3424398A1 EP18177243.5A EP18177243A EP3424398A1 EP 3424398 A1 EP3424398 A1 EP 3424398A1 EP 18177243 A EP18177243 A EP 18177243A EP 3424398 A1 EP3424398 A1 EP 3424398A1
Authority
EP
European Patent Office
Prior art keywords
pump
torque
speed
drive motor
water
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
EP18177243.5A
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German (de)
English (en)
Other versions
EP3424398B1 (fr
Inventor
Raymond Römer
Jörg SKRIPPEK
Stefan Wetzel
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.)
BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
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Publication of EP3424398A1 publication Critical patent/EP3424398A1/fr
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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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/02—Devices for adding soap or other washing agents
    • D06F39/022—Devices for adding soap or other washing agents in a liquid state
    • 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
    • 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
    • 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
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A47L15/4418—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants in the form of liquids
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • 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
    • 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
    • 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
    • D06F2103/44—Current or voltage
    • D06F2103/48—Current or voltage of the motor driving the pump
    • 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
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • 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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps

Definitions

  • the invention relates to a method for operating a water-conducting domestic appliance having a pump for conveying an aqueous liquid, a variable-speed, permanent-magnet synchronous motor as a pump drive motor and a control unit and a water-conducting household appliance suitable for carrying out this method.
  • a water-conducting domestic appliance generally has a pump for carrying aqueous liquids, e.g. a washing liquor or a rinsing liquid. It is known to drive a pump in a household appliance by means of a single-phase synchronous motor. The cases occur that the water is nearly or already completely pumped out and therefore the pump promotes little or no water at all. As a rule, this leads to increased noise emission and inefficient use of the "drive motor". In the prior art, therefore, methods are specified which lead to the shutdown of the pump at a sudden drop in load or at least close to the flow rate.
  • aqueous liquids e.g. a washing liquor or a rinsing liquid.
  • the publication DE 10 2010 042 491 A1 describes a pump device for a domestic appliance, with a drive motor for driving a pump wheel, wherein the rotor of the drive motor permanent magnets, and with a circuit arrangement for operating the drive motor, wherein the stator of the drive motor at least three phase strands and the circuit arrangement to each phase strand an electrical control for Controlling a current flow through the associated phase strand.
  • the circuit arrangement is designed to control the rotational speed and / or the direction of rotation of the drive motor by driving the controls.
  • the circuit arrangement is designed to switch off the drive motor when a predetermined current intensity of a current is undershot and / or falls short of a predetermined torque of the drive motor.
  • the circuit arrangement can be designed to regulate the rotational speed of the drive motor as a function of the detected current.
  • the publication DE 10 2008 029 910 B4 describes a method for detecting the load state of a fluid conveying, by an electric motor driven pump of a household appliance, wherein the pump is driven by a three-stranded, three-phase permanent magnet, designed as a synchronous motor electric motor using a vector control, wherein the vector control from a measured phase current from two of the three phase currents determines a torque-forming current component and from this at least one load state Pump is determined.
  • the publication EP 2 918 721 A1 relates to a pump device for a water-bearing device such as washing machine or dishwasher with a treatment container for receiving washing liquid for treating laundry within the treatment container, for pumping or pumping over washing liquid, comprising a pump with an electric motor and a rotatable impeller for conveying the liquid, the is connected to a controlled by a control device power stage for controlling the flow rate, wherein the control device is adapted to detect the pump or the motor supplied electrical parameters and to influence in response to these parameters, the supply of electrical power or current to the motor.
  • the electrical parameter used is the electrical power absorbed by the motor or the absorbed current, wherein the control device is designed to regulate the electric power or current supplied to the motor as a function of the detected parameters by means of the power stage, so that a predetermined electrical power or preset current sets.
  • the publication DE 10 2009 002 150 A1 describes a method for operating a water-conducting household appliance, in particular a dishwasher, in which a Siebbelegungsgrad a switched in the hydraulic circuit of the household appliance filter system is detected, wherein upon detecting a falling below a predetermined limit Siebbeschegungsgrades rinsing liquid is only partially removed from the household appliance.
  • the publication DE 10 2007 030 072 A1 relates to an electrical drive device for a domestic water-conducting appliance and describes that by detecting engine parameters, the idling case of a pump can be closed with a BLDC pump drive motor to govern by shutdown to a snorkel condition.
  • the publication DE 44 18 721 A1 describes a control method for liquor circulating in domestic dishwashers, with the help of the continuity of the flow rate per unit time and its consistency are monitored and the liquor circulating pump drive motor speed pickup including using a phase control in its speed is adjustable, with changing volume flow, the speed fluctuations as well Motor current consumption fluctuations of the liquor circulation pump drive motor can be detected.
  • the publication DE 691 10 356 T2 describes a device for measuring the amount of water in a washing machine, in which the washing liquid is recirculated and sprayed onto the laundry using a circulation pump.
  • the suction and dry-running state of a circulation pump of a washing machine can be determined, for example, by measuring the current-voltage phase shift. Without an initialization, the characteristic quantities in the control are preprogrammed.
  • this object is achieved by a method for operating a water-conducting domestic appliance and a water-conducting domestic appliance (hereinafter also abbreviated to "domestic appliance") according to the independent patent claims.
  • Preferred embodiments of the invention are listed in the respective dependent claims. Preferred embodiments of the method correspond to preferred embodiments of the household appliance, even if it is not separately pointed out here in each case.
  • the measurement of the torque M by measuring an electrical variable of the pump drive motor.
  • the pump drive motor amperage l as an idle current l L is measured, and the torque M l is determined from a stored in the control device connection between the current intensity I and the torque M.
  • the torque M of the pump over a predetermined period .DELTA.t is measured and measured in this period mean torque M m is considered idle torque M l .
  • the period .DELTA.t is preferably from 0.2 to 3 seconds, more preferably from 0.5 to 2 seconds, and still more preferably from 0.8 to 1.5 seconds.
  • the pump drive motor operates in a controlled range in that the speed n 1 is greater than a speed n s at a synchronization time.
  • a distinction is made in particular between a "controlled” and a “controlled” operation.
  • controlled operation a high electrical current is generally applied immediately, which is then significantly reduced later during the regulation (“controlled operation"), for example to approximately 1/3 to 1 ⁇ 2 of the value selected therefrom. This leads to a power savings.
  • the "synchronization time” is according to DE 10 2008 029 910 B4 (Cf. Fig. 3 ) a time indicated by a flash in a plot of the impressed current I q against the time t after a controlled start, in which the start of a load detection and idle detection of the pump takes place.
  • the rotor of the pump drive motor often runs in an oil (silicone oil) as a working medium, so that there is a gap between the rotor and the wall of the corresponding chamber (canned filling). If this chamber leaks, the oil may escape and contaminants may enter the chamber. In both cases the friction is affected.
  • oil silicone oil
  • a rotor of the pump drive motor is stored in a liquid working medium, in particular an oil, which is preferably a silicone oil or an oil-water emulsion.
  • the idle torque M l is extrapolated at the speed n l to a comparison torque M N for the speed n N, wherein the pump has a non-zero flow rate.
  • the speed-dependent and / or temperature-dependent contributions of the magnetic flux density, the engine friction and / or the delivery pressure of the pump are preferably compensated by the measured idling load for extrapolation.
  • the starting conditions for the determination of the idling speed ie the idling load
  • the knowledge of the idling speed determines the evaluation of operating parameters of the pump drive motor in the pumping operation of the pump.
  • the treatment process may be, for example, a washing program in a washing machine.
  • the engine friction influences the idling torque. Due to various negative influences, from slow-acting as wear to fast acting as sudden disturbances, such as pollution, the idle torque can change more or less rapidly over time. This allows conclusions about the state of the pump and / or pump drive motor, so that appropriate countermeasures can be taken.
  • M l old may be an idle torque stored immediately before or a long time ago.
  • several consecutive values of idle torque may be stored to detect potentially slower pump or pump drive motor wear.
  • a loss of liquid working fluid due to a leak is advantageously closed by more than a predefined permissible value ⁇ M loss when the idling torque M l decreases.
  • the inventively provided improved determination of the idle speed allows improved in terms of accuracy of the pump operation of the water-conducting household appliance.
  • a method is preferred in which the additional torque M F required for transporting the aqueous fluid is used to determine the delivery flow Q, which is the difference between a measured torque M at a speed n N at which the pump has a of non-zero flow, and the idling torque M l or an extrapolated comparison torque M N results.
  • the extrapolated comparison torque M N is considered that some of the factors influencing the idle speed as the speed increases, for example, a nominal speed to promote a certain amount of aqueous liquid change, so that a more accurate operation of the pump is possible.
  • the aqueous liquid can also generally be referred to as "conveying medium” and in particular also be a mono- or multiphase conveying medium which contains an aqueous liquid and / or air.
  • air may be contained in the conveying medium, in particular in the form of foam.
  • the density ⁇ of the pumped medium decreases with increasing content of air or foam.
  • Density ⁇ of the pumped medium means in particular the density of the pumped fluid in the pump.
  • speed of the variable-speed pump while the density ⁇ of the pumped medium can be determined in particular on the basis of the power consumption P of the pump.
  • a relationship between the power consumption P and the density ⁇ is advantageously stored in the control device for different values of the rotational speed n N.
  • the density ⁇ can be determined more accurately on the basis of the inventively improved determination of the idling rotational speed, so that overall a washing process in a washing machine is better can be tracked and controlled.
  • a method is preferred in which the motor current I Q of a pump drive motor is measured and evaluated for monitoring the density ⁇ of the pumped medium. This is sometimes referred to as a regulator current I Q or torque-forming current component I_q.
  • a water-conducting household appliance in which a rotor of the pump drive motor is mounted in a liquid working medium.
  • the water-conducting household appliance is not restricted according to the invention. Preferably, however, it is selected from the group consisting of a washing machine, a washer dryer, a tumble dryer and a dishwasher.
  • Washing machine, washer-dryer and tumble dryer generally contain a drum for receiving laundry items to be treated, in particular to be cleaned and / or dried.
  • the pump is connected via a lye duct with the tub.
  • the pumped through the aqueous fluid can be pumped off or preferably fed back to the tub in a circular operation.
  • Such a washing machine has a corresponding circuit for an aqueous liquid for the circular operation.
  • the invention has numerous advantages.
  • the invention makes it possible to determine the idling power of a pump used in a water-conducting domestic appliance, taking into account engine friction, engine temperature and pump delivery pressure. This makes it possible to take into account the current no-load performance, which always changes due to the influence of temperature, wear and media-related friction, and has a major impact on the accuracy of all procedures Has.
  • the method according to the invention makes it possible to unambiguously determine this idling power at the beginning of each pumping process.
  • an improved response of the pump falls below a defined flow rate possible, for example, a reduction in the pump speed or switching off the pump.
  • the invention enables the improved determination of various fault conditions of a pump used in a water-conducting domestic appliance.
  • the measured value for the idling torque can be used as follows: Low-pass filtered or as a moving average for comparison with the idling torque to compensate for controller jumps, ie sudden changes in current.
  • a volume flow converted over a temporal integral (see. DE 10 2008 029 910 B4 ) be used to determine the amount conveyed to assess the absorbency of existing in the drum laundry items or discover device leaks compared to a measured Ein Hughesmenge, here as an addition or Redundancy to an aqua-stop float.
  • the amount of water in the water-conducting household appliance can be accurately determined to favorably influence a spin speed in a washing machine. In a washer-dryer, the resulting amount of condensation can be determined with improved accuracy.
  • the idle torque reading in the presence of a timeout timer, may be used to detect clogged waterways, a blocked water supply, or a too high overhead drain hanger height. An error message or customer information can then be sent. Possibly.
  • the speed of the pump drive motor can be increased to solve a blockade or overcome the selected high hanging height.
  • the idle torque reading may be used to detect with increased accuracy the average flow rate, cross-sectional constrictions of the waterways, impeller malfunctions, or a customer-connected hose extension. Again, can be done as a measure an error or customer information. It can also be increased speed to move the operating point to a larger flow Q.
  • FIG. 1 shows, in a non-limiting embodiment, a suitable washing machine for carrying out the method according to the invention as a non-limiting example of a water-conducting household appliance.
  • FIG. 2 shows the dependence of a torque M or an impressed electric current I of the pump drive motor of the flow Q, where Q is the amount per unit time of a supported aqueous liquid, and the dependence of the idling torque of the fluid.
  • Fig. 3 shows in the form of plots of an impressed electric current I of the pump drive motor of the speed n, the speed dependence of various influencing factors.
  • Fig. 4 shows the dependence of an impressed electric current I of the pump drive motor of the flow Q, where Q is the amount per unit time of a supported aqueous liquid.
  • Fig. 5 shows in the form of plots of the torque M and the impressed electric current I against the temperature T_wel the package of the pump drive motor as a measure of the temperature of the pump drive motor frequent or used design schematically the influence of the engine temperature on the loss terms, ie engine friction, magnetic Flow, wherein the load torque, ie the directly associated with the pumping of aqueous fluid torque is kept constant.
  • Fig. 1 shows as a non-limiting example of a water-conducting household appliance, a washing machine 1, which has a tub 2, in which a drum 3 is rotatably mounted and driven by a drum drive motor 5.
  • the axis of rotation 19 of the drum 3 can be directed from the horizontal by a small angle (eg 13 °) forwardly upwards, so that the user of the washing machine 1 easier access and insight into the interior of the drum. 3 Has.
  • WäschemitPsychessorn 14 and scooping means 17 for the detergent-containing aqueous liquid 7, for example, wash liquor on the inner surface of the drum shell also also an intensification of the flow of the laundry items 4 with wash liquor 7 is achieved.
  • the washing machine 1 also has a water inlet system comprising a water connection fitting for the domestic water network 20, an electrically controllable valve 21 and a supply line 13 to the tub 2, which may optionally also be guided via a Waschstoffein réelleschale 12, from the incoming water detergent portions in the Lye container 2 can transport.
  • the valve 21 as well as the heater 16 may be controlled by a control unit 8 depending on a program flowchart, which may be bound to a time program and / or to the achievement of certain measurements of parameters such as liquor level, liquor temperature, drum speed, etc. within the washing machine 1.
  • 9 indicates a motor-drum control unit which can particularly determine and store the drum speed n T , the drive current value I AT and a drum rotation period ⁇ t T.
  • the hydrostatic pressure p results from the filling level, the free liquor 7 forming in the tub 2 and the items of laundry already saturated and to be cleaned.
  • the washing machine 1 of the embodiment shown here comprises a measuring device 15 for determining the filled amount of water, e.g. a water meter or a flowmeter.
  • a measuring device 15 for determining the filled amount of water, e.g. a water meter or a flowmeter.
  • the amount of water flowed in is calculated in conjunction with a detected filling time.
  • the flow can be determined as a redundancy system by measuring the time to reach a predetermined level height corresponding to a certain fixed amount of water.
  • a balance for determining the amount of filled laundry.
  • flow meter and balance allow an even better embodiment of a rinsing phase or a spin phase taking place therein.
  • the inventive method ultimately allows a more accurate determination of the flow rate Q via an improved determination of the idling torque M l , by comparing the amount of water filled with the pumped Amount of water on amount and / or type of laundry items 4 located in the drum 3 are closed.
  • 11 means a display device with which, for example, process parameters, in particular a drainage of a washing program or a power consumption P of the pump drive motor 26 can be displayed.
  • the 18 denotes a pump, in this embodiment e.g. a radial centrifugal pump, for pumping the aqueous liquid 7 from the tub 2.
  • the pump 18 is arranged in the intake duct 23.
  • the radial centrifugal pump 18 used here is connected to the control unit 8.
  • the control unit 8 is arranged to detect and monitor the power consumption P of the radial centrifugal pump 18, the drive current value I, i. to determine the impressed electric current, and to regulate the rotational speed n of the radial centrifugal pump 18.
  • FIG. 2 shows the dependence of a torque M or an impressed electric current I of the pump drive motor of the flow Q, where Q is the amount per unit time of a supported aqueous liquid, and the dependence of the idling torque of the fluid.
  • 27 is a characteristic curve for the dependency of the torque M or impressed electric current I of the pump drive motor on the delivery flow Q, using only the portion of the torque I exceeding the idling torque M l 28 for the conveyance, ie the pumping of the aqueous fluid.
  • the idle torque M l 28 is greater in the case of a pump filled with an aqueous liquid than for a partially vented pump (see point 29) or for a ventilated, free-running pump (see point 30).
  • Fig. 2 illustrates the process of the invention.
  • Ml the idle load at which the linear ratio of torque and flow at 0 l / min intersects the y-axis
  • the speed n of the pump is raised to an idling speed n l at which the pump drive motor is in the controlled range works
  • the nozzle pressure of the pump is not enough to build a flow in terms of aqueous fluid. This ensures that the torque of the pump drive motor is detected, which is applied only for the engine friction and a generally known To overcome power to build up pressure.
  • the speed at the synchronization time of a controller of the control unit is very much exceeded and therefore generally carried out, so that the controller or the pump drive motor changes into the regulated range.
  • current values in particular the torque-forming regulator current Iq, or the values for the torque can be detected well.
  • These measurements are preferably averaged over a predetermined period of time, eg, 1 second, and represent the idle torque M l of the pump at the current engine temperature and speed. In general terms, this can also be described in such a way that the torque M of the pump is measured over a predetermined period of time ⁇ t and the mean torque M m measured in this period is regarded as the idling torque M l .
  • Fig. 3 shows in the form of plots of an impressed electric current I of the pump drive motor of the speed n, the speed dependence of various influencing factors. Based on Fig. 3 It can be shown how the idling torque M l determined at an idling speed can be extrapolated to a nominal speed n of the pump which is subsequently used during actual pumping.
  • Fig. 3 31 represents the characteristic curve for the rotational speed-independent component of the magnetic flux density at the torque or the impressed current I used here.
  • the characteristic curve 32 additionally takes into account a proportion of engine friction increasing linearly with the rotational speed n, herein also for the liquid-bearing rotor as Couette friction designated.
  • Characteristic curve 33 additionally takes into account a characteristic line, not shown separately here, for a proportion of the delivery pressure which increases quadratically with the rotational speed n.
  • the characteristic curve 34 results from the addition of a portion of the injected current I to the characteristic curve 33 which is due to the delivery flow.
  • the extrapolation to a nominal speed n of the pump used in actual pumping can be illustrated as an example as follows. It is from an unknown, but temporarily constant engine temperature at the time of performing the method according to the invention, which can be referred to in this context as initialization, assumed. As mentioned are in Fig. 3 the four parts of the pump motor load, expressed here as impressed current I, shown over the speed n of the pump drive motor.
  • the temperature-dependent magnetic flux density of the rotor magnets and thus of the reciprocal-proportional electrical current to be impressed are independent of the rotational speed n, the intersection of which with the ordinate, however, being generally known. This is determined during initialization and thus taken into account.
  • the engine friction is generally linearly dependent on the speed, with the starting point in the coordinate origin.
  • the rotor of the pump drive motor generally a permanent magnet, is generally stored in a liquid working fluid in the pump drive motors used in household water appliances.
  • a rotor is preferably mounted there in a barrel or split tube in silicone oil or another working medium. Therefore, the rotor is sometimes referred to as wet runner. Due to the generally narrow gap between the rotor and the rotor, as well as due to metrological results, it can be assumed that there is a Couette flow as gap flow. In this gap flow, the fluid friction increases in proportion to the flow velocity despite turbulence. Therefore, the characteristic 32, which is the sum of the contribution of magnetic flux density and engine friction, is linear, especially since bearing friction or friction on seals is generally negligible compared to fluid friction.
  • the characteristic of the delivery pressure generated by the impeller of the pump is generally quadratically dependent on the speed of the impeller.
  • the characteristic curve 33 additionally takes into account the delivery pressure in comparison to the characteristic 32.
  • Initialization therefore firstly measures a current value I designated as a calibration measured value 35 at an idling speed n 1 , for example 1000 revolutions per minute, which measures the impressed current as a function of the magnetic flux density, the Couette friction of the magnetic flow tube flow and the fraction of the built-up pressure contains.
  • n 1 an idling speed
  • M liquid M idle + b liquid n nom - n idle + c liquid n nom 2 - n idle 2 is extrapolated to the idling torque M l 37 of the nominal speed, for example 2800 revolutions per minute.
  • the idling torque M liquid thus determined for the nominal speed used for pumping corresponds to the load taken by the pump at 0 l / min flow Q as the starting value of the torque (iq) flow characteristic, eg the characteristic 27 of FIG Fig. 2 ,
  • Fig. 4 shows in the characteristic curve 27, the dependence of an impressed electric current I, here referred to as I_q, the pump drive motor from the flow rate Q, where Q is the amount per unit time of a pumped aqueous liquid.
  • I_q impressed electric current
  • Q is the amount per unit time of a pumped aqueous liquid.
  • 28 means the idling torque M l , which is also the starting point of an I / Q characteristic here.
  • Fig. 5 in the form of plots of the torque M and the impressed electric current I against the temperature T_wel the package of the pump drive motor as a measure of the temperature of the pump drive motor schematically shows the influence of the engine temperature on the loss terms, ie engine friction, magnetic flux, wherein the load torque
  • the directly associated with the pumping of aqueous liquid torque is kept constant.
  • Graph 39 shows the influence of the temperature dependence of the magnetic flux, which decreases linearly with increasing temperature, so that a correspondingly convincedslessnessgendering current I, herein also denoted by I q increases linearly.
  • Graph 40 shows the temperature dependence of engine friction. Because of the operating medium used in general, for example, a silicone oil, here decreases the engine friction due to the temperature-decreasing viscosity of the silicone oil, resulting in the decrease of a current I to be impressed with increasing temperature T_wel shows.
  • the graph 38 shows the non-temperature-dependent influence of the load torque.
  • Fig. 5 Thus, the influence of the engine temperature on the loss terms considered by the method described herein, which is essentially a calibrating initialization, is described. If the engine warms up from room temperature due to the load, the winding temperature initially rises. The package temperature generally follows with a time-delayed offset. The temperature of a commonly used canned filling, ie the use of a liquid operating medium described for embodiments of the invention, usually an oil-water emulsion behaves similar to the package temperature, which is easier to detect metrologically.
  • the magnetic flux density B decreases in proportion to the temperature, which is why the regulator, ie, in particular a control unit of the water-based household appliance, must memorize a reciprocal-proportional current ⁇ I flow in order to maintain the speed at constant load.
  • the viscosity of the gap tube filling behaves exponentially degressive to the temperature. Since there is probably a Couette flow in the can, the friction and thus the friction torque I friction behave correspondingly degressively.
  • the load moment is in Fig. 3 has been assumed to be constant, which can be achieved experimentally, for example by using a torque brake.
  • the curve or graph 41 represents the result of an addition of the three load terms.
  • the curve 41 shows the total resulting torque M (I ges ) of the pump drive motor at steady state operation as a function of temperature. It has been found experimentally that the typical curve of curve 41 with local minima at average package temperatures and average temperatures of the operating medium for different loads was found.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP18177243.5A 2017-07-06 2018-06-12 Procédé de fonctionnement d'un appareil électroménager à circulation d'eau à détermination de la durée de marche à vide d'une pompe améliorée et appareil électroménager correspondant Active EP3424398B1 (fr)

Applications Claiming Priority (1)

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DE102017211571.8A DE102017211571A1 (de) 2017-07-06 2017-07-06 Verfahren zum Betrieb eines wasserführenden Haushaltsgerätes mit verbesserter Bestimmung einer Leerlauflast einer Pumpe und Haushaltsgerät hierfür

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EP3424398A1 true EP3424398A1 (fr) 2019-01-09
EP3424398B1 EP3424398B1 (fr) 2022-10-05

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EP (1) EP3424398B1 (fr)
CN (1) CN109208266B (fr)
DE (1) DE102017211571A1 (fr)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3975814A4 (fr) * 2019-06-03 2023-10-25 Ecolab USA Inc. Puisard de lave-vaisselle et appareil du type lave-vaisselle
EP4335349A1 (fr) * 2022-09-09 2024-03-13 Miele & Cie. KG Procédé de pompage de liquides à partir d'appareils ménagers
BE1030863B1 (de) * 2022-09-12 2024-04-08 Miele & Cie Abpumpen von Flüssigkeiten bei Haushaltsgeräten

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN110974104B (zh) * 2019-12-13 2020-12-25 珠海格力电器股份有限公司 洗碗机补水控制方法、装置、存储介质及洗碗机

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DE69110356T2 (de) 1990-07-03 1995-10-26 Zanussi Elettrodomestici Apparat zum Messen der Wassermenge in einer Waschmaschine.
DE4418721A1 (de) 1994-05-28 1995-11-30 Licentia Gmbh Steuerungsverfahren für Laugenumwälz-Pumpen in Haushalt-Geschirrspülmaschinen
DE102007030072A1 (de) 2007-06-29 2009-01-02 BSH Bosch und Siemens Hausgeräte GmbH Elektrischen Antriebseinrichtung für ein Wasserführendes Haushaltsgerät
WO2009156326A2 (fr) * 2008-06-24 2009-12-30 BSH Bosch und Siemens Hausgeräte GmbH Procédé de détermination de l'état de charge d'une pompe
DE102009002150A1 (de) 2009-04-02 2010-10-07 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betreiben eines wasserführenden Haushaltsgeräts
EP2442438A2 (fr) * 2010-10-15 2012-04-18 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de pompe pour un appareil ménager, appareil ménager et procédé de fonctionnement d'un dispositif d'entraînement
DE102010042494A1 (de) 2010-10-15 2012-04-19 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Abschalten eines Einphasen-Synchronmotors, Schaltungsanordnung zum Betreiben eines Einphasen-Synchronmotors und Hausgerät
DE102011000287A1 (de) 2011-01-24 2012-07-26 Miele & Cie. Kg Verfahren zur Einstellung eines von einer Umwälzpumpe in einem wasserführenden Haushaltgerät geförderten Volumenstroms
EP2918721A1 (fr) 2014-03-14 2015-09-16 Miele & Cie. KG Dispositif de pompage pour un appareil aquifère et appareil aquifère
EP2933365A1 (fr) 2014-04-17 2015-10-21 Miele & Cie. KG Procédé de réglage d'un système de pompes à recirculation

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EP1783264A3 (fr) * 2005-11-04 2008-10-15 Fisher & Paykel Appliances Ltd. Améliorations concernant les machines à laver
DE102008055022A1 (de) * 2008-12-19 2010-06-24 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Abpumpen einer Flüssigkeit aus einem wasserführenden Haushaltsgerät
DE102013100373A1 (de) * 2013-01-15 2014-07-17 Miele & Cie. Kg Verfahren zum Betreiben eines wasserführenden Haushaltsgerätes und wasserführendes Haushaltsgerät
US9609997B2 (en) * 2013-07-09 2017-04-04 Haier Us Appliance Solutions, Inc. Systems and methods for detecting appliance pump cavitation or dry state
DE102014217943A1 (de) * 2014-09-08 2016-03-10 BSH Hausgeräte GmbH Verfahren zum Betrieb einer Waschmaschine mit einem Drucksensor sowie hierzu geeignete Waschmaschine

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DE69110356T2 (de) 1990-07-03 1995-10-26 Zanussi Elettrodomestici Apparat zum Messen der Wassermenge in einer Waschmaschine.
DE4418721A1 (de) 1994-05-28 1995-11-30 Licentia Gmbh Steuerungsverfahren für Laugenumwälz-Pumpen in Haushalt-Geschirrspülmaschinen
DE102007030072A1 (de) 2007-06-29 2009-01-02 BSH Bosch und Siemens Hausgeräte GmbH Elektrischen Antriebseinrichtung für ein Wasserführendes Haushaltsgerät
WO2009156326A2 (fr) * 2008-06-24 2009-12-30 BSH Bosch und Siemens Hausgeräte GmbH Procédé de détermination de l'état de charge d'une pompe
DE102008029910B4 (de) 2008-06-24 2014-01-16 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Lastzustandserkennung einer Pumpe
DE102009002150A1 (de) 2009-04-02 2010-10-07 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betreiben eines wasserführenden Haushaltsgeräts
EP2442438A2 (fr) * 2010-10-15 2012-04-18 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de pompe pour un appareil ménager, appareil ménager et procédé de fonctionnement d'un dispositif d'entraînement
DE102010042494A1 (de) 2010-10-15 2012-04-19 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Abschalten eines Einphasen-Synchronmotors, Schaltungsanordnung zum Betreiben eines Einphasen-Synchronmotors und Hausgerät
DE102010042491A1 (de) 2010-10-15 2012-05-03 BSH Bosch und Siemens Hausgeräte GmbH Pumpeneinrichtung für ein Hausgerät, Hausgerät und Verfahren zum Betreiben eines Antriebsmotors
DE102011000287A1 (de) 2011-01-24 2012-07-26 Miele & Cie. Kg Verfahren zur Einstellung eines von einer Umwälzpumpe in einem wasserführenden Haushaltgerät geförderten Volumenstroms
EP2918721A1 (fr) 2014-03-14 2015-09-16 Miele & Cie. KG Dispositif de pompage pour un appareil aquifère et appareil aquifère
EP2933365A1 (fr) 2014-04-17 2015-10-21 Miele & Cie. KG Procédé de réglage d'un système de pompes à recirculation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3975814A4 (fr) * 2019-06-03 2023-10-25 Ecolab USA Inc. Puisard de lave-vaisselle et appareil du type lave-vaisselle
US11903545B2 (en) 2019-06-03 2024-02-20 Ecolab Usa Inc. Dishwasher sump and dishwasher apparatus
EP4335349A1 (fr) * 2022-09-09 2024-03-13 Miele & Cie. KG Procédé de pompage de liquides à partir d'appareils ménagers
BE1030863B1 (de) * 2022-09-12 2024-04-08 Miele & Cie Abpumpen von Flüssigkeiten bei Haushaltsgeräten

Also Published As

Publication number Publication date
PL3424398T3 (pl) 2023-02-06
DE102017211571A1 (de) 2019-01-10
EP3424398B1 (fr) 2022-10-05
CN109208266B (zh) 2022-03-29
CN109208266A (zh) 2019-01-15

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