EP2887764A2 - Appareil ménager et procédé de surveillance pour un appareil ménager - Google Patents

Appareil ménager et procédé de surveillance pour un appareil ménager Download PDF

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Publication number
EP2887764A2
EP2887764A2 EP14198582.0A EP14198582A EP2887764A2 EP 2887764 A2 EP2887764 A2 EP 2887764A2 EP 14198582 A EP14198582 A EP 14198582A EP 2887764 A2 EP2887764 A2 EP 2887764A2
Authority
EP
European Patent Office
Prior art keywords
relay
feedback signal
heating elements
domestic appliance
working
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
EP14198582.0A
Other languages
German (de)
English (en)
Other versions
EP2887764A3 (fr
EP2887764B1 (fr
Inventor
Ralf Hochhausen
Ralf Krebs
Markus Wecker
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
Original Assignee
BSH Hausgeraete GmbH
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Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP2887764A2 publication Critical patent/EP2887764A2/fr
Publication of EP2887764A3 publication Critical patent/EP2887764A3/fr
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Publication of EP2887764B1 publication Critical patent/EP2887764B1/fr
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • 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

Definitions

  • the present invention relates to a household appliance, for example a dishwasher, and a monitoring method for such a household appliance.
  • Heating elements of household appliances can be controlled by means of relays.
  • a circuit may consist of a safety relay and a respective working relay for each heating element.
  • Existing processes use relays with changeover contacts to monitor the heating elements.
  • One of the contacts can be used as a feedback signal.
  • this arrangement is unfavorable in terms of robustness of the monitoring against false errors, since the contact used as a feedback signal must be used in the small signal range and thus is prone to oxide formation.
  • Another possibility of monitoring is the measurement of the heating current of a heating element.
  • the respective heating element must be completely switched to the mains in order to detect whether the heating element has burned out. Furthermore, this error can not be distinguished from a relay error.
  • EP 2 386 806 B1 discloses a domestic appliance comprising a heating circuit for heating a fluid, wherein the fluid heating circuit comprises a heating element which can optionally be supplied with power to effect the heating of the fluid, and a monitoring unit for monitoring the operation of the heating circuit.
  • the monitoring unit is configured to monitor at least one electrical potential inherent in the heating circuit, wherein the at least one electrical potential inherent in the heating circuit is at least one of an internal electrical potential connected to a first terminal of the heating element connected to an on / off switch of the heating circuit , and an internal electrical potential connected to a second terminal of the heating element connected to a power switch of the device or to a circuit breaker for switching off the heating circuit in case of malfunction of the on / off switch connected is detected.
  • the monitoring unit is further configured to determine a value of the voltage of the power distribution network and calculate a first and a second electrical reference potential based on the detected value of the voltage of the power distribution network, comparing the at least one detected internal electrical potential with the first and second electrical reference potential, and Detecting a condition of proper operation or malfunction of the heating circuit, wherein the condition of malfunction is detected in the event that the at least one detected internal electric potential does not fall within a range of values lying between the first and second electrical reference potentials.
  • EP 0 924 331 B1 discloses a safety circuit for a heating circuit of a washing machine, a dishwasher or a dryer, the heating circuit having a series circuit comprising a heating switch contact, a heating resistor and a safety switch.
  • a monitoring arrangement monitors the heating circuit for faults and, in the event of an error, causes the heating circuit or the machine to be shut down.
  • an object of the present invention is to provide an improved monitoring of a household appliance.
  • a domestic appliance in particular a water-conducting household appliance which has at least two heating elements, wherein a respective heating element of the at least two heating elements is coupled via a respective first node to a respective working relay for driving the respective heating element, wherein the first nodes via a feedback device for providing a common working relay feedback signal are high impedance coupled, and having a monitoring device for monitoring the provided work relay feedback signal to detect a fault condition of the household appliance.
  • heating elements can be controlled in this way in the household appliance, taking into account the functional safety. Detecting an error condition, and in particular a fault diagnosis, can result in an unsafe one Operation of the household appliance can be avoided. Since the monitoring device does not receive a feedback signal from a contact of a relay, the monitoring is robust with respect to fake errors. The switching state of the relay can be monitored with little effort and cost, since only a high-impedance coupling of the first node by the feedback device, such as a feedback circuit, is realized.
  • the household appliance is for example a dishwasher.
  • the working relay feedback signal is formed by this high-impedance coupling.
  • the heating elements act in this constellation as short circuits, so have low-resistance properties. An error of one of the heating elements or one of the working relay thus leads to a change in the working relay feedback signal and can therefore be easily detected.
  • the at least two heating elements are, for example, as heaters, in particular as a thin-film heating and a heater for drying a drying material, for. As zeolite formed.
  • the feedback device has a voltage divider.
  • the voltage divider can be formed for example by resistors. These can be made high impedance compared to the heating elements in order to realize the high-impedance coupling of the heating elements to the first node.
  • the at least two heating elements are coupled to a second node and connected to a safety relay.
  • the safety relay is used to disconnect the heating elements from the power supply.
  • this safety relay can be included in the monitoring by the monitoring device.
  • the monitoring device is configured to monitor a safety relay feedback signal provided at the second node and dependent on the safety relay.
  • the safety relay feedback signal is affected by both the safety relay and the heating elements. To all three relays, i. Both the safety relay and the safety relay can be monitored using the safety relay feedback signal and the working relay feedback signal.
  • the monitoring device is configured to monitor a relationship of the safety relay feedback signal and the working relay feedback signal to each other and to detect a fault condition when the ratio changes.
  • the heating elements and the relays there is an adjusting signal relationship between the safety relay feedback signal and the working relay feedback signal. If, for example, one of the heating elements has burned out, the working relay feedback signal shifts and the fault state can be detected by means of a ratio formation of the two feedback signals without one of the heating elements having to be switched on.
  • the resistors of the feedback device are selected such that the safety relay feedback signal and the working relay feedback signal are identical in error-free operation of the heating elements, the working relay and the safety relay.
  • the two feedback signals may be at identical or nearly identical levels in error-free operation. A deviation between the signals can thus be regarded as an error case.
  • the monitoring device is configured to perform a predefined switching sequence of the working relay and the safety relay and to evaluate the ratio of the working relay feedback signal to the safety relay feedback signal in each switching state of the switching sequence.
  • Whether one of the relays can not be switched on can be checked using the predefined switching sequence. In each switching state of the sequence, certain signal ratios are expected. If these do not set within a defined time, it can be assumed that one of the relays does not switch. Which relay is this can be determined via the respective switching step of the sequence.
  • the monitoring device is configured to turn on one of the work relays and to evaluate the resulting work relay feedback signal.
  • one of the work relays can be turned on and the resulting work relay feedback signal evaluated.
  • the monitoring device is configured to perform a predefined switching sequence of the working relay and to evaluate the resulting work relay feedback signal.
  • the predefined switching sequence for example, first one and then the other working relay can be switched on. Subsequently, the respective work relay feedback signal can then be evaluated or evaluated.
  • the monitoring device is a microcontroller.
  • the microcontroller may be a microcontroller of the household appliance, which also has other functions.
  • the monitoring device is configured to detect a shifting of the potential of the safety relay feedback signal.
  • Ground fault in this context means that one of the heating elements is an unintentional electrically conductive connection got to earth potential. This may be the case, for example, if the PE conductor is incorrectly connected.
  • the fault state of the household appliance has one of the fault conditions: an error state of one of the heating elements, a fault state of both heating elements, a fault state of a safety relay, a fault state of a working relay and / or a faulty connection of one of the heating elements to the protective conductor.
  • An error condition of the heating elements may be a burnout of one or both heating elements.
  • a fault condition of the relay may be a stuck relay or a non-switched relay.
  • a faulty connection of one of the heating elements to the protective conductor can be a ground fault of one of the heating elements.
  • a method for monitoring a household appliance in particular a water-conducting household appliance, which has at least two heating elements, wherein a respective heating element of the at least two heating elements is coupled via a respective first node with a respective working relay for driving the respective heating element proposed.
  • the method includes providing a common working relay feedback signal via a feedback device to which the first nodes are high impedance coupled, and monitoring the provided working relay feedback signal to detect a fault condition of the household appliance.
  • the at least two heating elements are switched off in the provision of the common working relay feedback signal.
  • the heating elements are simple low-resistance resistors. In case of failure of one of the heating elements, ie when one of the heating elements is blown, one of the low-resistance connections represented by the heating elements is missing, which is detected as a change in the working relay feedback signal.
  • a computer program product such as a computer program means may, for example, be used as a storage medium, e.g. Memory card, USB stick, CD-ROM, DVD, or even in the form of a downloadable file provided by a server in a network or delivered. This can be done, for example, in a wireless communication network by transmitting a corresponding file with the computer program product or the computer program means.
  • Fig. 1 shows a schematic view of a first embodiment of a household appliance 1, in particular a dishwasher.
  • the dishwasher 1 has a first heating element 3 and a second heating element 4. These are connected via a respective first node K1, K2 to a respective working relay 5, 6.
  • the working relay 5 controls the first heating element 3 and the working relay 6, the second heating element 4 at.
  • the first nodes K1, K2 are coupled in a high-impedance manner via a feedback device FB for providing a common working relay feedback signal 7.
  • the high-impedance coupling can be done for example by a voltage divider formed by the resistors R1, R2, R3.
  • the values of the resistors R1, R2, R3 are high-resistance compared to the resistance values representing the two heating elements 3, 4.
  • a monitoring device 2 monitors the provided working relay feedback signal 7 to detect a fault condition of the dishwasher 1. Such a fault condition may be an error of one of the heating elements 3, 4 or one of the working relay 5, 6.
  • Fig. 2 shows a schematic view of a second embodiment of a dishwasher 1.
  • the two heating elements 3, 4 are connected via a second node 3 to a safety relay 8.
  • a resistor R6 is connected.
  • Other resistors R4, R5, R7 may be provided in the assembly.
  • the safety relay 8 is connected to potential L (high).
  • the working relay 5, 6 are connected to potential N (low, ground).
  • the monitoring device 2 receives in this embodiment not only the Working relay feedback signal 7, but also a safety relay feedback signal 9, which depends on the safety relay 8 and the heating elements 3, 4.
  • a ground fault of a heating element here heating element 3, via a resistor R PE done (reference numeral 10). This can also be detected by the monitoring device 2.
  • the following states may occur and be detected by the monitoring device 2.
  • exemplary signal values will be specified.
  • the feedback signals 7, 9 have the same signal level in error-free operation. However, this may vary depending on the specific embodiment.
  • Heating elements 3, 4 off and no error the two feedback signals 7, 9 have the same signal level in the error-free state.
  • the signal level is approximately in the middle of the measuring range at 1.
  • the working relay feedback signal 7 and the safety relay feedback signal 9 are connected to ground (N) low resistance. Both signals are equal to 0.
  • Heating elements 3, 4 and the safety relay 8 glued The work relay feedback signal 7 and the safety relay feedback signal 9 are low impedance connected to mains potential (L). Both signals are equal to 3.
  • Heating elements 3, 4 and a heating element 3, 4 blown The work relay feedback signal 7 and the safety relay feedback signal 9 are no longer the same, since the low-resistance connection through a heating element 3, 4 is missing. This shifts the voltage divider ratio of the work relay feedback signal 7 and the error condition can be detected by a ratio of the two feedback signals 7, 9. However, it can not be distinguished as to which of the heating elements 3, 4 is burned.
  • the monitoring device 2 can perform a fault diagnosis.
  • test sequence With the help of a test sequence can be checked in the case of a blown heating element 3, 4, which of the two heating elements 3, 4 is burned.
  • one of the two working relays 5, 6 is switched on and the working relay feedback signal 7 is evaluated.
  • Whether one of the relays 5, 6, 8 can not be switched on can be checked with the aid of a defined switch-on sequence, as described by way of example in FIG Fig. 3 is shown. In each switching state of the sequence, certain signal ratios are expected. If these do not set within a defined time, it can be assumed that one of the relays 5, 6, 8 does not switch. Which relay 5, 6, 8 is that can be determined via the switching step of the sequence.
  • the signal levels of the two feedback signals 7, 9 shift in the direction of GND or L. This signal shift can be used as a measure of a ground fault.
  • switching sequence represents S0 the initial state.
  • both working relay 5, 6 are turned on.
  • both working relay 5, 6 are turned off.
  • the safety relay 8 is turned on.
  • switching state S4 a working relay 5, 6 and the associated heating element 3, 4 are turned on.
  • switching state S5 a working relay 5, 6 and the associated heating element 3, 4 are turned off again.
  • switching state S6 the safety relay 8 is turned off.
  • Dishwasher 1 described here can detect whether one or more heating relays 5, 6, 8 are glued. It can also be recognized whether a relay 5, 6, 8 can not be turned on. It is also possible to detect a burned-out heating element 3, 4 without connecting the heating element 3, 4 to the mains. Furthermore, a ground fault 10 of the heating elements 3, 4 can be detected without connecting the heating elements 3, 4 to the mains. For the monitoring of three relay switching states only two signals 7, 9 are required. In particular, no changeover relays are necessary.
  • Fig. 4 shows a schematic flow diagram of an embodiment of a method for monitoring a dishwasher 1, as shown in Fig. 1 or 2 is shown.
  • a common working relay feedback signal 7 is provided via a feedback device FB, with which the first nodes K1, K2 are coupled in a high-impedance manner.
  • the provided work relay feedback signal 7 is monitored in a second step 202 to detect a fault condition of the household appliance 1. This can be done, as described above, by changing the working relay feedback signal 7 or by changing a ratio between this and another feedback signal 9.

Landscapes

  • Control Of Resistance Heating (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Washing And Drying Of Tableware (AREA)
EP14198582.0A 2013-12-20 2014-12-17 Appareil ménager et procédé de surveillance pour un appareil ménager Active EP2887764B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013226833.5A DE102013226833A1 (de) 2013-12-20 2013-12-20 Haushaltsgerät und Überwachungsverfahren für ein Haushaltsgerät

Publications (3)

Publication Number Publication Date
EP2887764A2 true EP2887764A2 (fr) 2015-06-24
EP2887764A3 EP2887764A3 (fr) 2015-07-08
EP2887764B1 EP2887764B1 (fr) 2016-10-12

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EP14198582.0A Active EP2887764B1 (fr) 2013-12-20 2014-12-17 Appareil ménager et procédé de surveillance pour un appareil ménager

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EP (1) EP2887764B1 (fr)
DE (1) DE102013226833A1 (fr)
PL (1) PL2887764T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3388851A1 (fr) * 2017-04-10 2018-10-17 BSH Hausgeräte GmbH Ensemble de commutation pour tester un élément de commutation
CN111557626A (zh) * 2020-05-21 2020-08-21 上海明略人工智能(集团)有限公司 洗碗机加热管故障检测方法和装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924331B1 (fr) 1997-12-11 2006-07-12 Whirlpool Corporation Sécurité sur le circuit de chauffage d'une machine à laver le linge ou la vaisselle ou d'un sèche-linge
EP2386806B1 (fr) 2010-05-14 2013-05-22 Electrolux Home Products Corporation N.V. Surveillance des défauts dans le circuit de chauffage d'un appareil

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634842A (en) * 1984-12-28 1987-01-06 General Electric Company Diagnostic testing arrangement for an electric cooking appliance incorporating commutated relay switching circuits
JP4766254B2 (ja) * 2006-05-23 2011-09-07 株式会社Ｌｉｘｉｌ ヒータ異常検知回路
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
DE102010028533A1 (de) * 2010-05-04 2011-11-10 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät und Verfahren zum Überprüfen eines elektrischen Verbrauchers eines Haushaltsgerätes
EP2386675B1 (fr) * 2010-05-14 2014-07-16 Electrolux Home Products Corporation N.V. Circuit de chauffage avec surveillance de l'agencement pour appareil domestique
EP2386680B1 (fr) * 2010-05-14 2014-06-04 Electrolux Home Products Corporation N.V. Circuit de chauffage avec surveillance de l'agencement pour appareil domestique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924331B1 (fr) 1997-12-11 2006-07-12 Whirlpool Corporation Sécurité sur le circuit de chauffage d'une machine à laver le linge ou la vaisselle ou d'un sèche-linge
EP2386806B1 (fr) 2010-05-14 2013-05-22 Electrolux Home Products Corporation N.V. Surveillance des défauts dans le circuit de chauffage d'un appareil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3388851A1 (fr) * 2017-04-10 2018-10-17 BSH Hausgeräte GmbH Ensemble de commutation pour tester un élément de commutation
CN111557626A (zh) * 2020-05-21 2020-08-21 上海明略人工智能(集团)有限公司 洗碗机加热管故障检测方法和装置

Also Published As

Publication number Publication date
DE102013226833A1 (de) 2015-06-25
EP2887764A3 (fr) 2015-07-08
PL2887764T3 (pl) 2017-03-31
EP2887764B1 (fr) 2016-10-12

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