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EP3176306A1 - Procédé pour détecter un défaut dans un appareil fonctionnant à l'eau - Google Patents

Procédé pour détecter un défaut dans un appareil fonctionnant à l'eau Download PDF

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Publication number
EP3176306A1
EP3176306A1 EP15197551.3A EP15197551A EP3176306A1 EP 3176306 A1 EP3176306 A1 EP 3176306A1 EP 15197551 A EP15197551 A EP 15197551A EP 3176306 A1 EP3176306 A1 EP 3176306A1
Authority
EP
European Patent Office
Prior art keywords
water
appliance
component
electric
earth
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Withdrawn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
EP15197551.3A
Other languages
German (de)
English (en)
Inventor
Margret Thumm-Jorge
Robert Poettger
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 Corp
Original Assignee
Whirlpool Corp
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 Corp filed Critical Whirlpool Corp
Priority to EP15197551.3A priority Critical patent/EP3176306A1/fr
Publication of EP3176306A1 publication Critical patent/EP3176306A1/fr
Withdrawn legal-status Critical Current

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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 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/081—Safety arrangements for preventing water damage
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • 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
    • A47L15/4285—Water-heater arrangements
    • 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
    • A47L15/46—Devices for the automatic control of the different phases of cleaning ; Controlling devices
    • 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
    • A47L2401/34—Other automatic detections
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/01—Water supply, e.g. opening or closure of the water inlet valve
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/02—Water discharge, e.g. opening or closure of discharge valve

Definitions

  • the present invention relates to an improved method for detecting faults in an installed appliance using water, especially a domestic appliance.
  • EP-A-00924331 and EP-A-2353485 describe diagnostic methods applicable to appliances supplied with water, in particular washing machines, dishwashers or the like.
  • a drawback of these known diagnostic methods stands in that they can be correctly executed only if the appliance is electrically connected to ground/earth in a proper manner, that is, according to the standard regulations effective in the most modern countries.
  • this electrical connection is not sufficient or it is interrupted, critical safety issues could be faced by the user.
  • a risk of an electrical shock could exist whenever a metallic portion of the chassis which can enter in contact with the user, becomes at the potential of the mains. This occurrence could be caused by a fault internal to the appliance, for instance whenever an internal wiring carrying the power supply is interrupted (for instance when it becomes disconnected, broken or cut) and enters in contact with a metallic part of the appliance.
  • Risk of an electric shock for the user can become higher whenever safety devices are not installed in the household power supply network, if he/she touches said metallic portion of the chassis and the at the same time a water tap.
  • Aim of the present invention is therefore to provide a method for detecting a fault in an electric appliance into which water is supplied or drained and which overcomes the drawbacks of the known solutions.
  • the method of the present invention describes how to create in a water operated appliance a supplementary and/or alternative electrical path to the electrical connection to ground/earth for detecting abnormal conditions when said electrical connection to ground/earth is not present, the latter connection being required for the electrical connection of home appliances.
  • the method of the present invention is applicable to detect insulation faults of one or more electric or electronic components such as heaters, motors, sensors, pressostats or the like, in appliances in which a resistive path over the water can be created.
  • FIG. 1 it is generically described the electric connection of an appliance operating with the use of water, particularly a domestic appliance, to the power supply network, comprising an electric or electronic component to be monitored (the component of interest).
  • the schematic represents one of the possible configurations of an appliance in regard to which the disclosed method of the present invention can be applied.
  • the method of the present invention is not restricted to said configuration or limited to said appliances since it can be also applied to similar appliances such as humidifiers, air ionizers, air conditioners, steamers, ironing systems, coffee machines, dryers, steamers, kettles, boilers.
  • the appliance operating with the use of water is electrically supplied with the mains voltage generated by a power supply plant PS and furnished through the power supply network.
  • the power supply network typically comprises at least two conductors named line conductor L and neutral conductor N. However, a three phases supply line is however compatible with the present invention.
  • the neutral conductor N represents the reference voltage based on which the voltage of the line conductor L varies. Voltage from the mains is properly scaled to 110-210-240 Volts (at 50 or 60 Hz) for supplying household appliances.
  • Electric current breakers B for intercepting the mains are normally positioned upstream the household appliance in the electric power network.
  • each household electric plant has also to be provided with a ground connection to which the ground electrode and/or the earth electrode of appliances are to be connected.
  • the ground connection consists of an (ground/earth) electrode G electrically connected to ground GND through a resistive path of about 0 Ohm.
  • the ground electrode G and the neutral electrode N are connected together just after the breaker of the household network (as shown in Fig 1 ).
  • this is not relevant for the method of the present invention, even though a connection to ground of the appliance is expected and recommended.
  • an appliance can be directly connected to the Line L, Neutral N and ground G conductors with the harness or trough a plug P, as for instance shown in Fig. 1 .
  • An appliance typically comprises electric components that need to be supplied directly with the electric power of the mains as for instance heating elements, pumps, motors, thermostats, lamps, electro-valves other actuators etc..
  • An appliance may also comprise other electronic components and/or electronic circuits that need to be supplied with a low voltage source LVS circuit, such as sensors, the monitoring (logic) circuit LC, and the control circuit of the appliance.
  • the low voltage source LVS circuit which is typically a voltage adapter or a voltage transformer, is normally internal to the appliance and connected to the line L and neutral N conductors for the supply of electric current.
  • the monitoring logic circuit LC and the control circuit are shown as integrated into the complete system, even if the same functionality can be split in two or more separate components or circuits, including analog circuits.
  • the method of present invention can be applied to appliances provided with electric or electronic components which can enter in direct contact with water supplied into the appliance and/or drained from it.
  • electric or electronic components are for instance motors, electric heaters, thermostats, lamps, probes, pressostats and sensors.
  • the method of the present invention can be also applied to appliances in which said electric or electronic components are not in direct contact with water but for which an electric conductive (high resistive) path R water towards ground/earth GND can be established via internal parts when such parts enter in contact with water, in particular with a flowing water path WP (a water stream) in input to or in output from the appliance.
  • internal parts are for instance the grounding harness, the component support or any other grounded component in electrical connection with said component (i.e. the sump heater, the drum, the pressostat..).
  • water can be introduced into the appliance from the (household) water supply network, through air condensation, or by a manual filling of the water tank.
  • the water reservoir/container (or at least one of its portion) can be electrically connected to ground/earth through harness.
  • water can drained from the appliance by means of discharge tube, in a manual or automated manner, or even exploiting water evaporation.
  • the water filling and/or draining system can be part of a more complex hydraulic system which can be also provided with controlled valves and/or hydraulic pumps.
  • water pipe(s) can be made either of insulating materials, for instance plastic, or of conductive material (for instance metal) since their conductivity is not exploited by the method of the present invention.
  • the method of the present invention exploits the conductivity of not distilled water, preferably flowing water WP, for detecting an electric failure of an electric or electronic component belonging to the appliance and/or for diagnosing when the electrical connection ground of the appliance to ground/earth GND is deteriorated or is missing.
  • the resistive path created through water is supplementary to the normal electrical connection to ground/earth and allows detecting abnormal conditions when said electrical connection to ground/earth is not present. In particular, it allow detecting whenever an appliance is not properly installed and/or to detect a component failure even when the ground connection is discontinued or is missing.
  • the above results can be achieved by an electric conductive path R water through water, preferably created on a temporarily basis, preferably towards ground GND or earth.
  • the method of the present invention requires measurements and/or estimations of the resistance R between said electric or electronic component (the monitored component, also hereafter referred as the component of interest) and ground GND and/or earth in different operating conditions of the same component and/or of the appliance.
  • the determined/estimated resistance R to ground GND and/or earth is then compared with some predetermined (electrical) thresholds values linked to expected values of the insulation resistance Rg of the same electric or electronic component for the corresponding operating condition.
  • Said measurements/estimations preferably involve one or more sampled electrical parameters of the electric circuit directly or indirectly related to the monitored component. Measurements/estimations may include further computational steps, including any parametric estimation made through the monitoring/logic circuit LC and/or through the control circuit uC.
  • the component to be monitored is a resistive heating element HE.
  • Its insulation resistance Rg is monitored through the logic circuit LC (and/or the control circuit uC) in order to check if it becomes sufficiently low (in the order of 100 kOhm or lower) for being inefficient and/or potentially harmful for a user.
  • the monitoring activity can be performed continuously, at predetermined time intervals, or at predetermined operational steps of the appliance, when water is introduced into the appliance or when drained from it.
  • the monitoring activity is performed at the start or at the beginning of a wash cycle.
  • the resistive heater HE is typically positioned in a lower position within the wash tub. During normal operation, the resistor HE is consistently not activated before being covered by or immersed in water in order to prevent the overheating of the tub ("a dry activation").
  • the appliance of Fig. 1 could include a system of optional switches SW1 and SW2 which can be operated by the logic circuit LC and/or by the control circuit uC. Said switches are preferably used for preventing a "dry activation" and for performing a selective diagnostic of at least one electric and/or electronic component. This functionality is for instance described in EP-A-00924331 or in EP-A-2353485 in regard to the heating element HE and/or of the pump motor. In commercial appliances, switches SW1 and SW2 can also be operated by means of a pressostat-switches driven by the water fed into or drained from the appliance tab.
  • the same above cited documents describe in detail a monitoring circuit LC, which is at least a logic circuit and which can be used for monitoring at least one electrical or electronic component for the purposes of the present invention, as previously described.
  • the monitoring circuit LC (and/or the control circuit uC) of Fig. 1 is configured for monitoring a fault of the electric heater HE by determining/estimating its resistance R towards ground/earth GND through the sampling one or more electrical parameters.
  • the circuit connecting the monitored component HE to the logic circuit LC could advantageously comprise a resistive partition Rs1, Rs2, Rs3 to scale and conditioning the sampled signal to be processed by the logic circuit LC (and/or the control circuit).
  • the resistance to ground GND earth is measures/estimated by logic circuit LC through the sampled electric parameters linked with the monitored component.
  • the measured/estimated resistance R to ground GND or earth of the monitored component HE is then used by the logic circuit LC and/or the control circuit uC to identify the occurrence of a fault of the same component or of the appliance, in dependence to parameters linked with insulation resistance Rg expected for the monitored component.
  • the insulation resistance Rg of a new manufactured water heater HE is typically very high (>100 MOhm) and has no influence to the operations and to the safety of the appliance while, in an old or faulty heater HE, the insulation resistance Rg may become so small that leakage current becomes significant and risky for the user.
  • the electric or electronic component (the heater HE) has to be replaced, because becomes "faulty", since a too high leakage current can cause dry heat, burnout or other safety issues, as before described.
  • this detection is made possible by the creation of an electrical conductive path (R water ) through water, preferably having a predetermined duration. This can be done by introducing water into the appliance or by draining water from the appliance.
  • the monitored component can be characterized through the status of one or more of its parameters linked with its insulation resistance Rg performances.
  • the status of the heater HE can be advantageous characterized through its operating temperature (either the surface temperature of the component, the surrounding temperature, the internal temperature or any temperature correlated with said component, etc..).
  • additional or alternative parameters such as humidity, pressure, radiation emissions, age of the component, electrical parameters (for instance the average/peak power delivered) and mechanical parameters (deformation..) can be considered, alone or in combination, for defining the proper status of the monitored component.
  • the monitored component (the heater HE) is initially taken or maintained in substantially stable first operating conditions: conditions under which the status of one or more parameter/s characterizing the status of the component is/are at/within a first predetermined value/s or range of values.
  • a first resistance R1 to ground GND or earth of the electric or electronic component of interest is measured or estimated in a known manner, as for instance described in the aforementioned applications.
  • water is fed into or drained from the appliance to fill/empty the tub or the reservoir, even for a limited time period.
  • water introduced into the appliance or drained from the appliance preferably a stream of flowing water WP, creates (directly or indirectly) an electrically conductive (high resistive) path R water , between the monitored component and ground GND or earth potential, acting as a conductor, preferably as a temporary conductor.
  • the high resistive path over water R water enables the passage of an electric (leakage) current, especially when the monitored electrical/electronic component is electrically supplied and when the same component presents a reduced (or even lost) electrical insulation Rg towards ground GND or earth.
  • Circulation of electric current in the created water path R water can occur whenever the heater HE is supplied to at least one of its terminals, in particular when supplied with the line conductor L.
  • the component of interest HE can supplied in a voluntary way (e.g. driven by means of switches SW1 and/or SW2), or in involuntary manner (e.g. as a consequence of a fault, especially a permanent fault). In both cases the method of the present invention can be applied.
  • the circulation of electric current in the component of interest is driven in a controlled manner, for instance trough switches SW1 SW2, when the high resistive path R water over water is present or is created, for the purposes of measuring or estimating the resistance R to ground GND earth.
  • the resistive path R water is preferably a temporary path.
  • the resistive path R water can also be persistent with the water present in the appliance reservoir. The latter case could occur when the monitored component, or the appliance, is in a permanent fault condition e.g. when the heater HE is permanently supplied in short circuit. This is especially applicable when the heater HE is placed into a tab/reservoir connected to ground GND earth and enters in contact with water, particularly when it is submerged within water. Therefore, a controlled electric supply of the monitored component HE is not always necessary for the purposes of monitoring the same component, and in particular for measuring or estimating the resistance R to ground GND or earth.
  • a temporary resistive path R water In case when a temporary resistive path R water is created in a driven manner, its duration preferably depends on the time during which water flows in or out of the appliance, but it can be also have a different predetermined (even reduced), duration.
  • This predetermined (time period) duration can be set either in a manual or in automated manner, preferably through the activation of the components belonging to the hydraulic circuit (pumps, valves).
  • the temporary (high) electrical resistive path R water over water is created between the monitored component and ground GND or earth either, when water flows into the appliance (fed water) and/or also when water is drained from the appliance.
  • the temporary high resistive path is created and maintained for a predetermined time period in the range from some milliseconds to some minutes, preferably less than a minute, and more preferably about some seconds in order to make reliable measurement(s) of the electric parameters required for obtaining the resistance R to ground GND or earth.
  • the (high) resistive path R water is created for the above purposes when the monitored component is substantially stable in said first operating conditions, preferably when the wash tub is filled during the execution of the wash program, or when it is emptied for the purpose of rinsing, or when water is drained, in particular before to starting the spin cycle.
  • the (high) resistive path R water is preferably created by the actuation of a hydraulic valve, optionally in combination with a pump, which allows water to flow into the appliance, or allows water to be drained.
  • the monitoring circuit LC executes the sampling of one or more electrical parameters of the component of interest which is preferably electrically supplied in a controlled manner.
  • the resistance R2 to ground GND or earth of the component is newly measured or estimated in a known manner.
  • the monitoring circuit LC can further carry out the diagnostics of the monitored component, in particular the diagnostic of the heating resistor HE of the washing/dishwashing machine of Fig. 1 .
  • the inventors have discovered that the value of the resistive path over the water R water is comparable with resistive paths of other appliance internal components, e.g. grounding harness, belt, bleeding resistor, tubes and hoses, which can in principle be used for the same purposes.
  • the resistances of this resistive path R water is in the range from some Mega Ohms up to Giga Ohms, depending on the technology adopted for the component.
  • a direct or an indirect comparison (though predetermined thresholds values) of the first resistance R1 to (the potential of) ground GND or earth, measured/estimated during the first step of the method, with the second resistance R2 to the potential of ground GND or earth, measured/estimated during the second step of the method (during which a resistive path R water over water, preferably a temporarily resistive path, is created), allows diagnosing a wrong behaviour of the monitored component.
  • a resistive path R water over water preferably a temporarily resistive path, is created
  • the method of the present invention is advantageously applied for obtaining a method for detecting a fault in an installed water-operated appliance. According to said use of the method, during a first phase it is assumed that the appliance is properly connected to ground GND or earth. That means that the appliance is assumed as correctly installed.
  • the electric or electronic component of interest is brought to or maintained into substantially stable first operating conditions.
  • the monitored component when the monitored component is at an initial first predetermined temperature, it is checked whether the estimated or measured value of the first resistance R1 to ground GND of the heating element HE (the monitored component) the appliance of Fig. 1 , is substantially lower than the insulation resistance Rg of a heating element HE which is in good working condition. In other words, it is checked whether the electric or electronic component (the heater HE) is not working properly when assuming that the appliance properly installed, that is, if it is properly connected to ground GND or earth.
  • first operating conditions for the appliance of Fig. 1 are the ones in which the heater HE is initially shut off (substantially in rest conditions/status). Accordingly, its first predetermined temperature is the initial room/ambient temperature. However, it is here remarked than any other temperature of the monitored component can be used for the same purpose.
  • measurements of one or more electric parameters according to the present invention are taken by the monitoring circuit LC in regard to the monitored component.
  • voltage/current signal(s) is/are sampled from the monitored component, e.g. heating element HE, preferably as described in EP-A-00924331 or in EP-A-2353485 .
  • the heater HE can be temporary supplied by closing one or more switch contact(s) under the supervision of the logic circuit LC and/or of the control circuit uC, or by the movement pressostat switches, before and/or during executing of the sampling.
  • Sampled signal(s) are then optionally processed in order to determine or to estimate a value of the first resistance R1 to ground GND.
  • Rg resistance resistance R to ground GND
  • the first resistance R1 to ground GND is compared with a first resistance threshold THR1 in order to check for a defect of the electric or electronic component of interest.
  • the first resistance threshold THR1 is selected in a range of values for which the insulating resistance Rg of the monitored component can be considered at the lower limit of its operational specifications.
  • THR1 can be in the range from 1Ohm to any measureable value (some GOhm), depending on the component type and on the technology applied thereto.
  • THR1 can be optimally set in the range from around 30 kOhm up to more than 10 MOhm, preferably from 30 kOhm up to 5 MOhm, more preferably about 70 kOhm, which is the insulation resistance value necessary with a supply of 230V to prevent a leakage of electric current of 3,5 m Amp.
  • this value of the first resistance threshold THR1 is indicative, and can be therefore different since it depends on the electric/electronic monitored component, from the power supply voltage and also on the precision of the measuring circuit LC.
  • the threshold THR1 can be also compensated in dependence of the effective value of the supply voltage, as explained in details in the referenced applications, particularly in presence of voltage variations.
  • the method according to the present invention is provided with a further additional second step.
  • a second further step according to the method checks to verify whether the appliance is not correctly connected to ground or earth GND (meaning to check if the appliance is not correctly installed) and checks to verify if the electric or electronic component (of interest) has at least reduced performances, meaning that a second resistance R2 to ground GND linked with the insulation resistance Rg of the monitored component is still in the operative range, but close to be out of order, or faulty (particularly in short circuit).
  • a high resistive path over water R water is created for instance by opening the inlet hydraulic valve for the filling of the tub, causing water to flow into the tub.
  • water can be fed into the appliance by the actuation of a pump.
  • the resistive path over water R water is created for a predetermined time period.
  • voltage/current signal(s) is/are newly sampled from the in a usual manner.
  • the monitored component is optionally electrically supplied during said phase, depending on the configuration of the appliance.
  • a second resistance R2 to ground GND is determined or estimated, as in the first step. Further, the second determined or estimated resistance R2 to ground GND is compared with a second resistance threshold THR2.
  • the value of said second resistance threshold THR2 is a resistive threshold value within the same range of THR1, which is established by taking into consideration the additional value of the temporary high resistive path created over water R water , indicated Rb in Fig. 1 .
  • THR2 is therefore in the range from few Ohms to several Mega Ohm, depending on the conductivity of the water fed in said appliance (eventually measured or estimated by the logic circuit LC in an usual manner) and on the conductivity of the water pipes.
  • the method could further include a preliminary step of measuring or estimating the conductivity of the system in presence of water, preferably of flowing water. This optional step preferably includes a direct measurement of the conductivity of the same water, preferably by using sensors.
  • THR2 is optimally in the range between 2 MOhm and 20 MOhm, and is preferably set about 5 MOhm.
  • this value of the second resistance threshold THR2 is indicative, and can be therefore different since it depends on the electric/electronic monitored component (the heater HE in the described case) and also on the precision of the measuring circuit LC.
  • the second resistance threshold value THR2 can be also compensated in dependence of the effective value of the supply voltage, in presence of voltage variations, as explained for the first step.
  • the appliance is not properly connected to ground GND or earth and that the insulation resistance Rg of the monitored component (the heater HE) is at least deteriorated or that the heater HE is faulty.
  • the users can be notified with an acoustic and/or visual indication.
  • the appliance has to be disconnected from the power supply network.
  • the ground GND or earth installation and appliance heater need to be repaired.
  • the electrical insulation resistance Rg of the electric or electronic component (the heater HE) changes when the operating conditions of the same component are significantly changed.
  • the electrical insulation resistance Rg of an electric or electronic component and therefore the leakage of electric current can be substantially different under different environmental and/or operational conditions, in which parameters such as the power supplied to the component, the temperature of the component, humidity, pressure or others parameters are changed.
  • the described first and second operating conditions can be by characterized, for instance by the operating temperature, pressure, humidity, and mechanical properties of the component of interest. These parameters can be considered separately or in combination when characterizing the operating conditions for the component of interest. They can vary, depending on the age and use of the component.
  • water present in the tub with the previous step has to be preferably drained.
  • water introduced in the previous step covering or submerging the heater HE can be maintained to prevent overheating, preferably if such water does not create the high resistive path over water R water . Accordingly, in the third step the status of the monitored component, the heater HE in the described embodiment, is switched to second operating conditions (either in a quick manner or after a certain time transient), conditions in which the electrical insulation resistance Rg of the electric or electronic component is expected to be significantly changed.
  • preferred second operating conditions are the ones in which the temperature of the monitored component (electric resistor HE) is at second predetermined temperature, a temperature which is substantially different (higher or lower) than the first temperature which corresponds to the temperature of the same component in first operating conditions.
  • Modification of the operating conditions can be achieved through the energization of the same component.
  • the monitored component the heater HE
  • its insulation resistance Rg is expected to decrease in normal operating conditions (not when a failure is present).
  • the internal insulation material (e.g. MgO) of the heater HE which is a temperature related material, should in fact reduce the insulating resistance Rg of the heater HE, when the temperature increases.
  • measurements of one or more electric parameters according to the present invention are taken by the monitoring circuit LC in regard to the monitored component, as in any of the previous steps.
  • a third resistance R3 to ground GND is further determined or estimated as in the first or in the second step.
  • the third determined or estimated resistance R3 to ground GND is compared with a third resistance threshold value THR3.
  • Said third resistance threshold value THR3 is linked to the resistance characteristics of the insulation material of the monitored component under second operation conditions and can be lower, equal or higher that THR1.
  • THR3 is selected in a range of values for which the insulating resistance Rg of the monitored component can be considered within the lower limit of its operational specifications, taking also into consideration the expected reduction of the insulation resistance Rg when the component is within acceptable operational working conditions.
  • THR3 is preferably set higher than THR1.
  • THR3 in the range between 100 kOhm and 1 MOhm, preferably about 300 kOhm.
  • the third resistance threshold THR3 is indicative, and can be therefore different since it depends on the electric/electronic monitored component (the heater HE in the described case), on the insulation resistance drift of the monitored component, from the supply voltage of the component while being active (e.g. temperature related resistance of insulation material) and also on the precision of the measuring circuit LC.
  • the second resistance threshold value THR3 can be also compensated in dependence of the effective value of the supply voltage, in presence of voltage variations, as explained for the previous steps.
  • the third determined or estimated resistance R3 to ground GND is greater than the third resistance threshold THR3
  • the user can be notified with an acoustic and/or visual indication.
  • the appliance has to be disconnected from the power supply network. The ground installation and appliance heater need to be repaired.
  • THR1, THR2 and THR3 are static values determined for the type of appliance prior to execute the present method and stored in a memory. Dynamic thresholds can be also calculated in dependence of the actual/normal conditions, eventually using conductibility sensors.
  • threshold values THR1, THR2 and THR3 are purely indicative since they are referred to the configuration of the washing machines Whirlpool SCW 1112 WH supplied at 230V and Whirlpool WFW 9100 SQ00 supplied at 120V, both the machines being currently in production.
  • a different set of threshold values can be established for a different construction/circuit of the appliance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
EP15197551.3A 2015-12-02 2015-12-02 Procédé pour détecter un défaut dans un appareil fonctionnant à l'eau Withdrawn EP3176306A1 (fr)

Priority Applications (1)

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EP15197551.3A EP3176306A1 (fr) 2015-12-02 2015-12-02 Procédé pour détecter un défaut dans un appareil fonctionnant à l'eau

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EP3176306A1 true EP3176306A1 (fr) 2017-06-07

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200388A (en) * 1960-08-12 1965-08-10 Weber Aircraft Corp Water leakage alarm system
US4297686A (en) * 1979-10-01 1981-10-27 Tom M Dale Water detection device
EP0924331A2 (fr) 1997-12-11 1999-06-23 Whirlpool Corporation Sécurité sur le circuit de chauffage d'une machine à laver le linge ou la vaisselle ou d'un sèche-linge
US20090126465A1 (en) * 2007-11-16 2009-05-21 Electrolux Home Products, Inc. Leak detection system for a dishwasher and associated method
EP2353485A1 (fr) 2010-02-05 2011-08-10 Whirlpool Corporation Circuit de commande de charge amélioré pour appareil d'électroménager, de type lave-linge, lave-vaisselle ou sèche-linge
EP2570545A1 (fr) * 2011-02-23 2013-03-20 Panasonic Corporation Machine à laver

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200388A (en) * 1960-08-12 1965-08-10 Weber Aircraft Corp Water leakage alarm system
US4297686A (en) * 1979-10-01 1981-10-27 Tom M Dale Water detection device
EP0924331A2 (fr) 1997-12-11 1999-06-23 Whirlpool Corporation Sécurité sur le circuit de chauffage d'une machine à laver le linge ou la vaisselle ou d'un sèche-linge
US20090126465A1 (en) * 2007-11-16 2009-05-21 Electrolux Home Products, Inc. Leak detection system for a dishwasher and associated method
EP2353485A1 (fr) 2010-02-05 2011-08-10 Whirlpool Corporation Circuit de commande de charge amélioré pour appareil d'électroménager, de type lave-linge, lave-vaisselle ou sèche-linge
EP2570545A1 (fr) * 2011-02-23 2013-03-20 Panasonic Corporation Machine à laver

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