EP2090690A1 - Türverschlussvorrichtung mit Wärmeschutz und Wärmeschutzverfahren für eine Türverschlussvorrichtung in einer Haushaltsvorrichtung - Google Patents

Türverschlussvorrichtung mit Wärmeschutz und Wärmeschutzverfahren für eine Türverschlussvorrichtung in einer Haushaltsvorrichtung

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Publication number
EP2090690A1
EP2090690A1 EP08151585A EP08151585A EP2090690A1 EP 2090690 A1 EP2090690 A1 EP 2090690A1 EP 08151585 A EP08151585 A EP 08151585A EP 08151585 A EP08151585 A EP 08151585A EP 2090690 A1 EP2090690 A1 EP 2090690A1
Authority
EP
European Patent Office
Prior art keywords
estimated temperature
door lock
lock device
incremented
locking mechanism
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
EP08151585A
Other languages
English (en)
French (fr)
Other versions
EP2090690B1 (de
Inventor
Valter Castellarin
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to AT08151585T priority Critical patent/ATE507342T1/de
Priority to EP08151585A priority patent/EP2090690B1/de
Priority to DE602008006516T priority patent/DE602008006516D1/de
Priority to PL08151585T priority patent/PL2090690T3/pl
Priority to PCT/EP2008/010997 priority patent/WO2009103331A1/en
Publication of EP2090690A1 publication Critical patent/EP2090690A1/de
Application granted granted Critical
Publication of EP2090690B1 publication Critical patent/EP2090690B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 
    • D06F39/12—Casings; Tubs
    • D06F39/14—Doors or covers; Securing means therefor
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door

Definitions

  • the present invention relates to a door lock device with thermal protection and to a method for thermal protection of a door lock device in a household appliance.
  • Delayed door lock devices enable opening the door of the appliance only after a time interval has elapsed since a washing cycle has been completed or paused in a condition wherein opening the door is allowed (e.g. there is no water in the washing compartment). Delayed door lock devices are based on use of thermosensitive components (normally PTC thermistors coupled to bimetallic deformable components). In use, PTC thermistors are energized by supplying a current and rapidly increase their temperature, causing deformation of bimetal components. A locking mechanism is thus actuated to a closing position, as long as the PTC thermistors are energized. When power supply is removed, PTC thermistors cool down and the bimetal components switch to a rest configuration in which the locking mechanism is released.
  • thermosensitive components normally PTC thermistors coupled to bimetallic deformable components.
  • PTC thermistors are energized by supplying a current and rapidly increase their temperature, causing deformation of bimetal components. A locking mechanism is thus
  • a drawback of delayed door lock devices resides in that a current must be supplied to the PTC thermistors during a whole washing cycle. Therefore, power consumption is quite high. Moreover, users must every time wait for a while before being allowed to open the door, until the PTC thermistors cool and the locking mechanism is released.
  • Instant door lock devices are operated by current pulses that are supplied by a power source in response to commands of a user. Subsequent pulses alternately lock and release door lock devices. A control button is normally available to this end.
  • Instant door lock devices do not require continuous power supply during washing cycles and, as a rule, may be immediately operated at any time, provided that cycle progress so allows.
  • temperature of door lock devices may dramatically increase following upon repeated current pulses and some thermal protection is required to prevent overheating.
  • additional circuits must be provided to forbid release of current pulses when temperature of locking devices exceeds a safety range.
  • thermal protection circuits include thermosensitive components and may be based on PTC thermistors. Again, additional costs are incurred and overall risk of component failure is increased.
  • the object of the present invention is to provide a door lock device with thermal protection and a method for thermal protection of a door lock device that are free from the above described drawbacks.
  • a door lock device and a method for thermal protection of a door lock device are provided, as claimed in claims 1 and 10, respectively.
  • a household appliance that in the embodiment herein described is a washer, is generally designated by the reference numeral 1.
  • the appliance 1 comprises a body 2, a washing compartment 3, a power supply unit 4, both accommodated in the body 2, and a door 5, for providing access to the washing compartment 3.
  • the washing compartment 3 is a rotary basket and the door is arranged on a front panel 2a of the body 2.
  • the door 5 is equipped with an instant-type door lock device 7 to prevent operation of the appliance 1 when the door 5 is not properly locked.
  • the door lock device 7 comprises a locking mechanism 10, a driving device 11 and a logic control unit 12.
  • the locking mechanism 10 is electrically actuatable by current pulses I to alternately lock and unlock the door 5.
  • the locking mechanism 10 maintains its current configuration, either locked or unlocked, until another current pulse I is received.
  • the driving device 11 is supplied by the power supply unit 4 and is moreover coupled to the locking mechanism 10 to deliver current pulses I, thereby causing the locking mechanism 10 to alternately lock and unlock. Current pulses I are released by the driving device 11 in response to driving signals S D provided by the logic control unit 12, as explained hereinafter.
  • the logic control unit 12 comprises a main module 15, a temperature estimation module 16, a test module 17 and a state storage element 18.
  • the logic control unit 12 is coupled to a control button 20, provided on the front panel 2a of the body 2 and operable by a user to produce lock/unlock signals S LU for the logic control unit 12 (see also figure 1 ).
  • the main module 15 controls operation of the whole appliance 1 and, in particular, determines progress of a washing cycle according to a program selected by a user. Among other functions, the main module 15 generates a consent signal S C to enable opening the door 5 when progress of the washing cycle so allows.
  • the temperature estimation module 16 determines and cyclically updates estimated values of an operative temperature T of actuating coils 10a of the locking mechanism 10, which run a risk of overheating if several current pulses are supplied in a short time.
  • estimated values T C of the operative temperature T are supplied to the test module 17.
  • the state storage element 18 stores a state logic signal ST that is indicative of a current state of the locking mechanism 10. Namely, the state logic signal ST has a first logic value when the locking mechanism 10 is locked and a second logic value when the locking mechanism 10 is unlocked. The state logic value is updated every time the locking mechanism 10 is operated.
  • the test module 17 determines whether or not a current pulse I is to be delivered to the actuating coils 10a of the locking mechanism 10 in response to lock/unlock signals S LU that are generated when the control button 20 is operated by a user.
  • determination is made by the test module 17 in accordance to a procedure illustrated in figure 3 .
  • the procedure is activated upon operation of the control button 20 by the user.
  • test module 17 receives the consent signal S C from the main module 15, the state logic signal ST from the state storage element 18 and the currently estimated value T C of the operative temperature T from the temperature estimation module 16.
  • the consent signal S C is first tested to check consent of the main module 15 to pulse generation (block 110). If consent is denied (block 110, output NO), the procedure is terminated (block 120). Otherwise (block 110, output YES), the state logic signal ST is tested to identify the current state of the locking mechanism 10 (block 130).
  • an incremented temperature value T I is compared to a first safety temperature threshold T TH1 (test condition: T I ⁇ T TH1 ; block 140).
  • the incremented temperature value T I is an estimation of the operative temperature T that is expected as a consequence of delivering another current pulse I.
  • the incremented temperature value T I is calculated by adding an expected temperature increment ⁇ T, associated with delivery of a current pulse I, to the currently estimated value T C of the operative temperature T.
  • the expected temperature increment ⁇ T is a constant, independent of the currently estimated value T C of the operative temperature T.
  • the incremented temperature value T I is calculated in advance to possibly delivering a current pulse I.
  • a driving signal S D is sent to the driving device 11 to trigger a current pulse I and actuate the locking mechanism 10 (block 150).
  • the driving signal S D is also provided to the temperature estimation module 16, for the purpose of updating the currently estimated value T C , and to the state storage element 18, that switches the state logic signal ST between its first and second logic values. Otherwise (block 140, output YES), the procedure is terminated (block 120), thereby preventing delivery of current pulses I by the driving device 11, because the incremented temperature value T I exceeds a safety range and the actuation coils 10a of the locking mechanism 10 may be subjected to overheating.
  • the incremented temperature value T I is calculated and compared to a second safety temperature threshold T TH2 (test condition: T I ⁇ T TH2 ; block 160).
  • the second safety temperature threshold T TH2 is lower than the first safety temperature threshold T TH1 .
  • the second safety temperature threshold T TH2 is equal to T TH1 - ⁇ T, so that in practice in block 160 the following condition is tested: T C + 2 ⁇ ⁇ ⁇ T ⁇ T TH ⁇ 1
  • the locking mechanism 10 is actuated by sending a driving signal S D to the driving device 11, to trigger a current pulse I (block 150). Otherwise (block 140, output YES), the procedure is terminated (block 120).
  • the driving device 11 delivers current pulses I in response to commands imparted by a user through the control button 20, unless generation of current pulses I is inhibited by the logic control unit 12, in order to prevent overheating of the actuating coils 10a of the locking mechanism 10.
  • Different safety temperature thresholds are used to enable switching of the locking mechanism 10 from the locked state to the unlocked state and from the unlocked state to the locked state.
  • a current pulse to lock the door 5 through the locking mechanism 10 is permitted only in case another current pulse I can be soon after delivered to unlock the door 5 without exceeding the highest temperature safety threshold (i.e. the first temperature safety threshold T TH1 ).
  • the door lock device 7 is always in condition to respond without any delay to a request to unlock the door 5.
  • the incremented temperature value T I is compared to a single safety temperature threshold, irrespective of the locked or unlocked state of the locking mechanism 10. In this case, the state storage element 18 is not required.
  • the estimation of the operative temperature T is determined and updated by the temperature estimation module 16 according to the procedure illustrated in figure 4 .
  • a minimum temperature value T MIN is selected as the currently estimated value T C of the operative temperature T during an initialization step (block 200).
  • the minimum temperature value T MIN is the highest temperature value that may be reached in the working environment of the locking mechanism 10 during a washing cycle.
  • the minimum temperature value T MIN is the highest temperature that the actuating coils 10a of the locking mechanism 10 may reach in case no current pulses I are sent by the driving device 11. Risk of underestimating the operative temperature T is thus avoided.
  • the minimum temperature value T MIN is 60°C.
  • T 0 is the most recent peak value of the currently estimated value of the operative temperature
  • t is time elapsed from the most recent peak value
  • ⁇ is a calibratable time constant.
  • the door lock device 7 provides for extremely simple, yet effective thermal protection of actuating coils 10a of the locking mechanism 10, without any need of additional components.
  • the existing logic control unit may be configured to carry out required test and temperature updating procedures as described above.
  • estimated values of the operative temperature may be updated according to different procedures. For example, effect of current pulses may be accounted for by variable temperature increments as a function of currently estimated temperature. Also cooling may be determined according to different cooling laws.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Lock And Its Accessories (AREA)
  • Special Wing (AREA)
  • Electric Ovens (AREA)
EP08151585A 2008-02-18 2008-02-18 Türverschlussvorrichtung mit Wärmeschutz und Wärmeschutzverfahren für eine Türverschlussvorrichtung in einer Haushaltsvorrichtung Not-in-force EP2090690B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT08151585T ATE507342T1 (de) 2008-02-18 2008-02-18 Türverschlussvorrichtung mit wärmeschutz und wärmeschutzverfahren für eine türverschlussvorrichtung in einer haushaltsvorrichtung
EP08151585A EP2090690B1 (de) 2008-02-18 2008-02-18 Türverschlussvorrichtung mit Wärmeschutz und Wärmeschutzverfahren für eine Türverschlussvorrichtung in einer Haushaltsvorrichtung
DE602008006516T DE602008006516D1 (de) 2008-02-18 2008-02-18 Türverschlussvorrichtung mit Wärmeschutz und Wärmeschutzverfahren für eine Türverschlussvorrichtung in einer Haushaltsvorrichtung
PL08151585T PL2090690T3 (pl) 2008-02-18 2008-02-18 Urządzenie do blokowania drzwi z zabezpieczeniem termicznym oraz sposób termicznego zabezpieczenia urządzenia blokującego drzwi w urządzeniu gospodarstwa domowego
PCT/EP2008/010997 WO2009103331A1 (en) 2008-02-18 2008-12-22 Door lock device with thermal protection and method for thermal protection of a door lock device in a household appliance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08151585A EP2090690B1 (de) 2008-02-18 2008-02-18 Türverschlussvorrichtung mit Wärmeschutz und Wärmeschutzverfahren für eine Türverschlussvorrichtung in einer Haushaltsvorrichtung

Publications (2)

Publication Number Publication Date
EP2090690A1 true EP2090690A1 (de) 2009-08-19
EP2090690B1 EP2090690B1 (de) 2011-04-27

Family

ID=39688948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08151585A Not-in-force EP2090690B1 (de) 2008-02-18 2008-02-18 Türverschlussvorrichtung mit Wärmeschutz und Wärmeschutzverfahren für eine Türverschlussvorrichtung in einer Haushaltsvorrichtung

Country Status (5)

Country Link
EP (1) EP2090690B1 (de)
AT (1) ATE507342T1 (de)
DE (1) DE602008006516D1 (de)
PL (1) PL2090690T3 (de)
WO (1) WO2009103331A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2708086A1 (de) * 1976-03-18 1977-09-22 Texas Instruments Italia Spa Tuerblockierungsvorrichtung
EP0965677A1 (de) * 1998-06-11 1999-12-22 BITRON S.p.A. Türschliessvorrichtung für ein elektrisches Haushaltsgerät
GB2344849A (en) * 1998-12-18 2000-06-21 Bitron Spa Electrically controlled door lock detent
DE19953633A1 (de) * 1999-11-09 2001-05-10 Diehl Ako Stiftung Gmbh & Co Steuereinrichtung einer Waschmaschine oder eines Wäschetrockners

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2708086A1 (de) * 1976-03-18 1977-09-22 Texas Instruments Italia Spa Tuerblockierungsvorrichtung
EP0965677A1 (de) * 1998-06-11 1999-12-22 BITRON S.p.A. Türschliessvorrichtung für ein elektrisches Haushaltsgerät
GB2344849A (en) * 1998-12-18 2000-06-21 Bitron Spa Electrically controlled door lock detent
DE19953633A1 (de) * 1999-11-09 2001-05-10 Diehl Ako Stiftung Gmbh & Co Steuereinrichtung einer Waschmaschine oder eines Wäschetrockners

Also Published As

Publication number Publication date
PL2090690T3 (pl) 2011-09-30
WO2009103331A1 (en) 2009-08-27
ATE507342T1 (de) 2011-05-15
EP2090690B1 (de) 2011-04-27
DE602008006516D1 (de) 2011-06-09

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