EP3376142B1 - Kühlschrank mit erweitertem frostfreiem betrieb - Google Patents

Kühlschrank mit erweitertem frostfreiem betrieb Download PDF

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Publication number
EP3376142B1
EP3376142B1 EP17161322.7A EP17161322A EP3376142B1 EP 3376142 B1 EP3376142 B1 EP 3376142B1 EP 17161322 A EP17161322 A EP 17161322A EP 3376142 B1 EP3376142 B1 EP 3376142B1
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EP
European Patent Office
Prior art keywords
matrix
ice level
operating
time interval
output values
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Application number
EP17161322.7A
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English (en)
French (fr)
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EP3376142A1 (de
Inventor
Serhat ÖZKÜCÜK
Ali Utku SACKIRAN
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.)
Vestel Elektronik Sanayi ve Ticaret AS
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Vestel Elektronik Sanayi ve Ticaret AS
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Priority to EP17161322.7A priority Critical patent/EP3376142B1/de
Priority to TR2017/04723A priority patent/TR201704723A2/tr
Publication of EP3376142A1 publication Critical patent/EP3376142A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating

Definitions

  • the present invention refers according to claim 1 to a refrigerator and a method for operating a refrigerator according to claim 7.
  • Document US5692385A discloses an apparatus for use with a refrigeration system including a compressor for compressing a working fluid evaporated in an evaporator and condensed in a condenser.
  • a control circuit initiates operation of a refrigeration cycle and initiates a defrost cycle in response to a defrost enable signal.
  • the apparatus drives an air moving assembly moving air over the evaporator.
  • a motor including a rotatable assembly is in driving relation to the air moving assembly.
  • An energizing circuit selectively energizes the motor in response to the control circuit.
  • a sensing circuit generates a speed/torque signal representative of a speed or a torque of the motor.
  • a defrost initiating circuit generates the defrost enable signal when the speed/torque signal indicates that the speed is greater than a predetermined speed or the torque is greater than a predetermined torque.
  • the defrost cycle is initiated in response to degradation of the refrigeration cycle as indicated by frost or ice on the evaporator which reduces air flow through the evaporator and increases static pressure.
  • Other demand defrost apparatus and methods of initiating and sensing defrost cycles are also disclosed.
  • Document US20080073376A1 discloses a dispenser, for preferably Frozen Carbonate Beverage (FCB) product, having valves that can be manually or electrically operated in response to electronic controls.
  • the valve has a jam dispensing position, and can be used with an additive, such as flavors, injector.
  • a power failure back up is provided to close the valve, along with sanitation and optional purging cycles.
  • Product dispense is provided only when sensed to have a desired consistency and/or in a condition to prevent splashing.
  • Additive dispense is provided only when product is present.
  • the dispenser can have a monitor and suitable controller to dispense strips or layers of different additives or flavors into the product.
  • a defrost controller may use an embodiment of such a probe to monitor an amount of frost build up on the fin or fins of a cooling unit (e.g., a refrigeration or freezer unit) so that the controller may initiate a defrost cycle only when warranted.
  • a cooling unit e.g., a refrigeration or freezer unit
  • Such a probe may be more reliable than other defrost-detection techniques, and such a defrost controller may increase the cooling and energy efficiencies of a cooling unit as compared to a cooling unit having a conventional defrost controller.
  • Document US4104888 discloses a control system for monitoring frost accumulation on the coil of a heat pump.
  • An operational parameter of the heat pump compressor responsive to frost accumulation such as compressor current, is compared to a reference level developed during a non-frost condition of the coil to initiate and terminate coil defrosting in response to a predetermined variation between the operational and reference parameter levels.
  • the main problem is that the presence and amount of ice on the heat-exchanger is not detected simultaneously without sensors.
  • Defrost operation is done automatically with help of periodic programming. Existence of ice and need of heating to melt the ice is unknown. So this periodic defrost operation causes inefficient situation by energy consume and cooling performance of No-frost refrigerators.
  • the refrigerator according to the present invention comprises at least a compressor unit for compressing a liquid, a heater unit for heating of at least parts of an internal space for defrosting, an energy source, in particularly a plug for connecting to a grid, wherein the energy source provides electric energy for operating the heater unit and wherein the energy source provides an operating current for operating the compressor unit, and a control unit, wherein the control unit determines changes of the operating current of the compressor unit, wherein the control unit operates the heater unit in a predefined manner in dependency of changes of the operating current, wherein operating current is detected in multiple predefined time intervals and an output value representing the average current in each time interval is outputted, wherein the output values are processed as matrix values, wherein the output values are inputted into a state matrix one after the other, wherein a determinant is calculated and outputted after the state matrix is filled, wherein further output values representing the average operating current in defined time intervals are outputted, wherein the output values are processed as further matrices
  • the operating current is detected according to the present invention in multiple predefined time intervals and an output value representing the average current in each time interval is outputted, wherein the output values are processed as matrix values, wherein the output values are inputted into a state matrix one after the other, wherein a determinant is calculated and outputted after the state matrix is filled.
  • This is beneficial since changes of the operating current are tracked and processed in a predefined manner.
  • further output values representing the average operating current in defined time intervals are outputted, wherein the output values are processed as further matrices values, wherein the output values are inputted into further state matrixes one after the other, wherein the output values of each time interval are processed as one state matrix, wherein a determinant is calculated and outputted for each state matrix.
  • This embodiment is beneficial since a very precise determination and handling of present situations is possible.
  • An ice level matrix is set up according to the present invention, wherein the ice level matrix is a YxY matrix, in particularly a 2x2 matrix, wherein the determinants are inserted in chronological order.
  • the ice level matrix is a YxY matrix, in particularly a 2x2 matrix, wherein the determinants are inserted in chronological order.
  • a further determinant is according to a further preferred embodiment of the present invention inserted into the field of the last line and the last column, the determinant of the filed in the first line and the first column is deleted, each of the other determinants is inserted into a field previous to the respective present field.
  • zero ice level is determined in case all four members of ice level matrix are negative, low ice level is determined in case three members of ice level matrix are negative, mid ice level is determined in case two members of ice level matrix are negative, high ice level is determined in case one members of ice level matrix is negative, highest ice level is determined in case zero members of ice level matrix are negative, wherein zero ice level does not require operation of heater unit and wherein low ice level requires a first time interval of operating the heater unit, wherein mid ice level requires a second time interval of operating the heater unit, wherein high ice level requires a third time interval of operating the heater unit, wherein highest ice level requires a fourth time interval of operating the heater unit, wherein the second time interval is longer than the first time interval and wherein the third time interval is longer than the second time interval and wherein the fourth time interval is longer than the third time interval.
  • This embodiment is beneficial since the necessary heater unit operation can be selected in a clear and precise manner.
  • the above mentioned object is also solved by a method according to claim 7 for operating a refrigerator.
  • the method comprises at least the steps: Providing a refrigerator, wherein the refrigerator comprises at least a compressor unit for compressing a liquid, a heater unit for heating of at least parts of an internal space for defrosting, an energy source, in particularly a plug for connecting to a grid, wherein the energy source provides electric energy for operating the heater unit and wherein the energy source provides an operating current for operating the compressor unit, and a control unit, wherein the control unit determines changes of the operating current of the compressor unit, wherein the control unit operates the heater unit in a predefined manner in dependency of changes of the operating current, wherein operating current is detected in multiple predefined time intervals and an output value representing the average current in each time interval is outputted, wherein the output values are processed as matrix values, wherein the output values are inputted into a state matrix one after the other, wherein a determinant is calculated and outputted after the state matrix is filled, wherein further output values representing the average operating current in
  • Fig. 1 shows a refrigerator comprising a BLDC compressor and a control unit.
  • Fig. 1 shows a refrigerator 1.
  • Said refrigerator 1 comprises a BLDC compressor 2.
  • the BLDC compressor is part of a heat-exchanger unit.
  • a control unit 3 operates a heater unit 4.
  • the present invention refers to a compressor unit 2 for compressing a liquid, a heater unit 4 for heating of at least parts of an internal space for defrosting, an energy source 5, in particularly a plug for connecting to a grid, wherein the energy source 5 provides electric energy for operating the heater unit 4 and wherein the energy source 5 provides an operating current for operating the compressor unit 2, and a control unit 3, wherein the control unit 3 determines changes of the operating current of the compressor unit 2, wherein the control unit 3 operates the heater unit 4 in a predefined manner in dependency of changes of the operating current.
  • the inventive refrigerator 1 preferably has a BLDC compressor (inverter).
  • Id is the flux component
  • Iq is the torque component of the BLDC compressor current.
  • the average of the torque component of the BLDC compressor current (Iq) is taken in certain measurement period.
  • the average measurements Iq values are captured in period of small certain time (interval between 5 and 10 minutes can be select) for a newly developed matrices algorithm.
  • the detecting existing ice even amount of the ice on the heat-exchanger without using any sensor but with using a matrix algorithm is possible.
  • Ice Level Matrix det state matrix _ 1 det state matrix _ 2 det state matrix _ 3 det state matrix _ 4
  • det state matrix_N .
  • det state matrix_N ) is always equal to zero or positive value.
  • Ice Level matrix One interpretation of the Ice Level matrix might be:
  • the heater unit is operated in dependency of the number of members of the Ice Level Matrix.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)

Claims (7)

  1. Kühlschrank (1),
    mindestens aufweisend
    eine Kompressoreinheit (2) zum Komprimieren einer Flüssigkeit,
    eine Heizeinheit (4) zum Heizen mindestens von Teilen eines Innenraums zum Abtauen,
    eine Energiequelle (5), insbesondere einen Stecker zur Verbindung mit einem Stromnetz,
    wobei die Energiequelle (5) elektrische Energie liefert, um die Heizeinheit (4) zu betreiben, und wobei die Energiequelle (5) einen Betriebsstrom zum Betreiben der Kompressoreinheit (2) liefert,
    und
    eine Steuerungseinheit (3),
    wobei die Steuerungseinheit (3) Änderungen des Betriebsstroms der Kompressoreinheit (2) feststellt,
    wobei die Steuerungseinheit (3) die Heizeinheit (4) in einer vorbestimmten Weise in Abhängigkeit von Änderungen des Betriebsstroms betreibt, dadurch gekennzeichnet, dass
    Betriebsstrom in mehreren vorbestimmten Zeitintervallen erfasst wird und ein Ausgabewert, der die durchschnittliche Stromstärke in jedem Zeitintervall repräsentiert, ausgegeben wird, wobei die Ausgabewerte als Matrixwerte verarbeitet werden, wobei die Ausgabewerte einer nach dem anderen in eine Zustandsmatrix eingegeben werden,
    wobei eine Determinante berechnet und ausgegeben wird, nachdem die Zustandsmatrix gefüllt ist, wobei weitere Ausgabewerte, die den durchschnittlichen Betriebsstrom in definierten Zeitintervallen repräsentieren, ausgegeben werden, wobei die Ausgabewerte als weitere Matrizenwerte verarbeitet werden, wobei die Ausgabewerte einer nach dem anderen in weitere Zustandsmatrizen eingegeben werden, wobei die Ausgabewerte eines Zeitintervalls jeweils als eine einzige Zustandsmatrix verarbeitet werden,
    wobei für jede Zustandsmatrix eine Determinante berechnet und ausgegeben wird, und
    wobei eine Eispegelmatrix erstellt wird, wobei die Eispegelmatrix eine YxY-Matrix ist, in welche die Determinanten in chronologischer Reihenfolge eingefügt werden.
  2. Kühlschrank gemäß Anspruch 1,
    dadurch gekennzeichnet, dass
    die Kompressoreinheit (2) einen BLDC-Kompressor aufweist oder aus diesem besteht.
  3. Kühlschrank gemäß Anspruch 1,
    dadurch gekennzeichnet, dass
    für den Fall, dass die Eispegelmatrix voll ist, eine weitere Determinante in das Feld der letzten Zeile und letzten Spalte eingefügt wird, wobei die Determinante in dem Feld in der ersten Zeile und der letzten Spalte gelöscht wird, die anderen Determinanten jeweils in ein Feld vor dem entsprechenden vorliegenden Feld eingefügt werden.
  4. Kühlschrank gemäß Anspruch 3,
    dadurch gekennzeichnet, dass
    die Eispegelmatrix eine 2x2-Matrix ist.
  5. Kühlschrank gemäß Anspruch 4,
    dadurch gekennzeichnet, dass
    ein Eispegel null in dem Fall festgestellt wird, in dem alle vier Elemente der Eispegelmatrix negativ sind,
    ein niedriger Eispegel in dem Fall festgestellt wird, in dem drei Elemente der Eispegelmatrix negativ sind,
    ein mittlerer Eispegel in dem Fall festgestellt wird, in dem zwei Elemente der Eispegelmatrix negativ sind,
    ein hoher Eispegel in dem Fall festgestellt wird, in dem ein Element der Eispegelmatrix negativ ist,
    ein höchster Eispegel in dem Fall festgestellt wird, in dem null Elemente der Eispegelmatrix negativ sind,
    wobei ein Eispegel null keinen Betrieb der Heizeinheit erfordert, und wobei ein niedriger Eispegel ein erstes Zeitintervall eines Betriebs der Heizeinheit erfordert,
    wobei ein mittlerer Eispegel ein zweites Zeitintervall eines Betriebs der Heizeinheit erfordert,
    wobei ein hoher Eispegel ein drittes Zeitintervall eines Betriebs der Heizeinheit erfordert,
    wobei ein höchster Eispegel ein viertes Zeitintervall eines Betriebs der Heizeinheit erfordert,
    wobei das zweite Zeitintervall länger als das erste Zeitintervall ist und wobei das dritte Zeitintervall länger als das zweite Zeitintervall ist und wobei das vierte Zeitintervall länger als das dritte Zeitintervall ist.
  6. Kühlschrank gemäß einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass
    jede Zustandsmatrix eine 2x2-Matrix ist.
  7. Verfahren zum Betreiben eines Kühlschranks
    mindestens aufweisend die folgenden Schritte:
    Vorsehen eines Kühlschranks (1), der mindestens aufweist:
    eine Kompressoreinheit (2) zum Komprimieren einer Flüssigkeit,
    eine Heizeinheit (4) zum Heizen mindestens von Teilen eines Innenraums zum Abtauen,
    eine Energiequelle (5), insbesondere einen Stecker zur Verbindung mit einem Stromnetz,
    wobei die Energiequelle (5) elektrische Energie liefert, um die Heizeinheit (4) zu betreiben, und
    wobei die Energiequelle (5) einen Betriebsstrom zum Betreiben der Kompressoreinheit (2) liefert,
    und
    eine Steuerungseinheit (3),
    wobei die Steuerungseinheit (3) Änderungen des Betriebsstroms der Kompressoreinheit (2) feststellt,
    wobei die Steuerungseinheit (3) die Heizeinheit (4) in einer vorbestimmten Weise in Abhängigkeit von Änderungen des Betriebsstroms betreibt,
    dadurch gekennzeichnet, dass
    Betriebsstrom in mehreren vorbestimmten Zeitintervallen erfasst wird und ein Ausgabewert, der die durchschnittliche Stromstärke in jedem Zeitintervall repräsentiert, ausgegeben wird, wobei die Ausgabewerte als Matrixwerte verarbeitet werden, wobei die Ausgabewerte einer nach dem anderen in eine Zustandsmatrix eingegeben werden,
    wobei eine Determinante berechnet und ausgegeben wird, nachdem die Zustandsmatrix gefüllt ist, wobei weitere Ausgabewerte, die den durchschnittlichen Betriebsstrom in definierten Zeitintervallen repräsentieren, ausgegeben werden, wobei die Ausgabewerte als weitere Matrizenwerte verarbeitet werden, wobei die Ausgabewerte einer nach dem anderen in weitere Zustandsmatrizen eingegeben werden, wobei die Ausgabewerte eines Zeitintervalls jeweils als eine einzige Zustandsmatrix verarbeitet werden,
    wobei für jede Zustandsmatrix eine Determinante berechnet und ausgegeben wird, und
    wobei eine Eispegelmatrix erstellt wird, wobei die Eispegelmatrix eine YxY-Matrix ist, in welche die Determinanten in chronologischer Reihenfolge eingefügt werden,
    Erfassen des Betriebsstroms,
    Betreiben der Heizeinheit (4) in Abhängigkeit von dem erfassten Betriebsstrom.
EP17161322.7A 2017-03-16 2017-03-16 Kühlschrank mit erweitertem frostfreiem betrieb Active EP3376142B1 (de)

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EP17161322.7A EP3376142B1 (de) 2017-03-16 2017-03-16 Kühlschrank mit erweitertem frostfreiem betrieb
TR2017/04723A TR201704723A2 (tr) 2017-03-16 2017-03-29 Geli̇şmi̇ş karlanma önleyi̇ci̇ i̇şleyi̇şe sahi̇p soğutucu

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Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104888A (en) 1977-01-31 1978-08-08 Carrier Corporation Defrost control for heat pumps
US5692385A (en) 1996-01-26 1997-12-02 General Electric Company System and method initiating defrost in response to speed or torque of evaporator motor
US20080073376A1 (en) 2006-04-12 2008-03-27 Imi Cornelius Inc. Frozen carbonated modulating dispensing valve and/or flavor injection
CA2776382C (en) 2009-10-02 2018-01-30 The Controls Group, Inc. Removal of an accumulated frozen substance from a cooling unit
KR101940509B1 (ko) * 2012-08-01 2019-01-22 삼성전자주식회사 냉각장치 및 그 제어방법
CN103913042B (zh) * 2013-01-02 2016-08-31 Lg电子株式会社 冰箱、家电及其操作方法
KR101817816B1 (ko) * 2013-11-05 2018-02-22 엘지전자 주식회사 냉장고
KR102220911B1 (ko) * 2014-01-06 2021-02-25 엘지전자 주식회사 냉장고, 및 홈 어플라이언스
KR102173371B1 (ko) * 2014-01-06 2020-11-03 엘지전자 주식회사 냉장고, 및 홈 어플라이언스

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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TR201704723A2 (tr) 2018-09-21

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