EP1180652A1 - Dispositif de commande et procédé pour commander l'opération de dégivrage dans un réfrigérateur - Google Patents

Dispositif de commande et procédé pour commander l'opération de dégivrage dans un réfrigérateur Download PDF

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Publication number
EP1180652A1
EP1180652A1 EP00117310A EP00117310A EP1180652A1 EP 1180652 A1 EP1180652 A1 EP 1180652A1 EP 00117310 A EP00117310 A EP 00117310A EP 00117310 A EP00117310 A EP 00117310A EP 1180652 A1 EP1180652 A1 EP 1180652A1
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EP
European Patent Office
Prior art keywords
defrost
evaporator
duration
temperature
compressor
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
EP00117310A
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German (de)
English (en)
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EP1180652B1 (fr
Inventor
Mike Hirsch
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.)
Ranco Inc of Delaware
Robertshaw US Holding Corp
Original Assignee
Ranco Inc of Delaware
Ranco Inc
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 Ranco Inc of Delaware, Ranco Inc filed Critical Ranco Inc of Delaware
Priority to DE2000630971 priority Critical patent/DE60030971T2/de
Priority to EP20000117310 priority patent/EP1180652B1/fr
Priority to TR2001/02371A priority patent/TR200102371A2/xx
Publication of EP1180652A1 publication Critical patent/EP1180652A1/fr
Application granted granted Critical
Publication of EP1180652B1 publication Critical patent/EP1180652B1/fr
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Expired - Lifetime legal-status Critical Current

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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
    • F25D21/002—Defroster control
    • F25D21/008—Defroster control by timer
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/15—Power, e.g. by voltage or current
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • 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
    • F25D2500/00—Problems to be solved
    • F25D2500/04—Calculation of parameters
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/02—Sensors detecting door opening
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/14—Sensors measuring the temperature outside the refrigerator or freezer

Definitions

  • the present invention relates to a controller and a method for controlling a defrost operation in a refrigerator, according to the preamble of claims 1 and 21.
  • a controller and a method of this kind are known from DE 29 45 691.
  • a controller for defrosting the evaporator of a refrigerator which adaptively controls a defrost operation for melting ice accumulated on the evaporator during a refrigeration period, that is during a period of normal operation of the refrigerator to maintain a food compartment of the refrigerator at a desired temperature. From this document it is known that when the compressor of the refrigerator is switched off to start a defrost operation, the time taken for the evaporator to reach a preset temperature above 0°C is approximately proportional to the amount of ice accumulated on the evaporator during the preceding refrigeration period.
  • Heater means are provided for supplying heat to the evaporator during the defrost operation.
  • the known controller delays a next defrost operation by a factor dependent on the time the evaporator takes to reach the preset temperature during the defrost operation.
  • the known controller measures the duration of a defrost time interval until the evaporator has reached the preset defrost temperature. If this duration is less than a predetermined target defrost duration, the known controller extends the next refrigeration period. If the defrost duration is larger than the target defrost duration, the known controller reduces the next refrigeration period and hence advances the beginning of the next defrost period. In this way, the known controller saves energy by carrying out less defrost operations in conditions of low ice formation rate. Similarly, if the ice formation rate is high, the frequency of defrost operations is increased thus ensuring that the evaporator stays largely ice free and hence operates at high efficiency.
  • the time taken by the evaporator to reach the preset defrost temperature above 0°C, signaling the end of a defrost operation is influenced not only by the amount of ice on the evaporator when an additional source of thermal energy, e.g. an electric heater, is used for accelerating the defrost operation.
  • the duration of the defrost time interval until the evaporator has reached the preset defrost temperature also depends on the amount of heat supplied by the additional source of energy per time unit to the evaporator during the defrost operation.
  • the energy that is supplied per time unit by the additional source of thermal energy in turn depends on the present condition of the power supply that feeds the thermal energy source.
  • Fig. 1a shows a typical behavior of the evaporator temperature T over time in a first condition A when the power supply of the refrigerator is weak, e.g. the mains voltage is low, and in a second condition B when the power supply is strong, e.g. the mains voltage is high. From Fig.
  • the known controller is furthermore unable to take into account the thermal dispersion through the refrigerator appliance insulation. Also, it initiates a defrost immediately after the calculated refrigeration period time limit has expired.
  • Fig. 1b shows a first situation A that the refrigeration period ends with the evaporator temperature having a comparatively high value.
  • Fig. 1b furthermore shows a situation B where the refrigeration period ends with the evaporator temperature being at a comparatively low value.
  • the total amount of time required for the evaporator to reach the preset defrost temperature differs in both situations A and B.
  • situation A the known controller will set the next refrigeration period time limit different than in situation B, due to the timing error in the defrost time interval. This again results in refrigeration periods less than optimum and in an increased energy consumption of the refrigerator.
  • the known controller always reacts to past icing conditions on the evaporator.
  • the accumulation of ice on the evaporator generally results from opening the refrigerator door. If after a defrost operation a user frequently opens the refrigerator door in the subsequent refrigeration period, the amount of ice actually accumulating on the evaporator may differ substantially from what was detected during the previous defrost operation.
  • the known controller is not able to react appropriately to this situation. It cannot prevent that in the course of the current refrigeration period with many door openings a lot of ice accumulates hence lengthening the time taken for the evaporator to reach the preset defrost temperature. This will cause the known controller to shorten the next refrigeration period even if the rate of ice accumulation returns to normal.
  • this object is solved as defined in claims 1 and 21.
  • a power supply condition of the refrigerator is detected and the target defrost duration is adjusted in accordance with the detected thermal dispersion.
  • the detected power supply condition can be the mains voltage or the current through the electrical heater when in operation. It would however be feasible to detect the present power supply condition for instance by means of measuring the temperature of the electrical heater means or even its temperature dependent electrical resistance when in the energized state.
  • the present invention allows to adapt the duration of the refrigeration periods to the actual amount of ice accumulated on the evaporator essentially independent from the condition of the mains to which the refrigerator is connected.
  • the present invention therefore improves the energy efficiency of a refrigerator with an adaptive defrost function in an unstable mains voltage environment.
  • the optimum target defrost time can be determined during development testing of the refrigerator appliance at a number of different power supply conditions and preferably also at a number of different ambient temperatures which the appliance can be expected to see during its use.
  • These various target defrost durations in association with the various mains voltages and ambient temperatures can be stored in a memory and can be used at the end of each defrost to calculate a new value for the subsequent refrigeration period.
  • fuzzy logic can be used.
  • the target defrost duration can be calculated through a mathematical formula as a function of the detected power supply condition and preferably of the detected thermal dispersion.
  • a nominal target defrost duration of 30 minutes at 250 V mains voltage feeding the heater can be adjusted by an amount proportional to the square of the mains voltage deviation from the 250 V.
  • a linear approximation can be sufficient.
  • the target defrost duration is calculated as a function of the thermal dispersion with a linear term and/or a quadratic term.
  • a controller according to the present invention is preferably implemented using a microprocessor, and said look up table or said calculation routine of the target defrost duration can be stored in the microprocessor read-only memory or similar non volatile storage medium. The resulting programming complexity is well within the capabilities of a low-cost 4-bit or 8-bit microprocessor.
  • the controller according to the present invention measures the refrigeration period in terms of compressor running time rather than in terms of total time between defrost operations.
  • the amount of ice accumulated on the evaporator can be regarded as approximately proportional to the accumulated running time of the compressor. It is, however, possible to use the total time, that is ON periods and OFF periods of the compressor during the refrigeration operation, for determining the refrigeration period.
  • the controller preferably starts a defrost at a fixed evaporator temperature thus ensuring that the defrost operation is always timed between two fixed temperatures.
  • the fixed evaporator temperature at which the defrost may be started by switching on the heater can vary according to the type of appliance.
  • the fixed evaporator temperature at which a defrost is started is preferably programmed into the memory of the micro controller at the time of manufacture, for example by the use of an EEPROM or other non volatile programmable memory.
  • this problem can also be solved using for instance a preset target defrost duration.
  • the heater can take the form of a resistive heating element or can be the interior light within the food compartment. This will cause the evaporator temperature to rise to the desired preset defrost temperature at which point the defrost is terminated and normal temperature regulation is resumed.
  • Fig. 2a shows a first embodiment of a controller for controlling a defrost operation in a refrigerator in accordance with the present invention.
  • Reference numeral 1 in Fig. 2 denotes the controller.
  • Reference numeral 2 denotes an evaporator connected via pipe means 3a and 3b to a compressor 3 for circulating cooling fluid through the evaporator 2 to achieve a cooling effect.
  • Reference numeral 22 denotes a temperature sensor mounted in thermal contact with the evaporator 2.
  • Reference numeral 4 denotes a refrigeration controller for performing normal temperature regulation inside a food compartment of the refrigerator. The refrigeration controller 4 receives an input from evaporator temperature sensor 22 and controls the operation of compressor 3.
  • This refrigeration controller can be any kind of temperature controller, for instance a wellknown 2-point controller which keeps the evaporator temperature during a refrigeration period between a low temperature threshold and a high temperature threshold.
  • Reference numeral 5 denotes a user-adjustable temperature dial for setting a desired temperature in the food compartment.
  • Reference numeral 6 denotes a timer means for inhibiting normal temperature regulation of the refrigeration controller 4 after expiry of a refrigeration period time limit.
  • the timer means 6 has a trigger input for triggering the timer. It furthermore has an input for setting a value for the refrigeration period time limit. After the timer has been triggered through its trigger input, it will output an inhibit signal to the refrigeration controller 4 after expiry of the set refrigeration period time limit.
  • the timer 6 counts the compressor running time and does not count time when the compressor is off. To this end the timer 6 receives from the refrigeration controller an indication on the operating state of the compressor.
  • Reference numeral 7 denotes a unit for measuring a defrost duration.
  • Unit 7 receives an input from evaporator temperature sensor 22. It furthermore receives a preset defrost temperature value. It also receives an input from timer 6 indicating when a refrigeration period time limit has been reached and a defrost operation starts.
  • Unit 7 for measuring a defrost duration begins a time measurement whenever this indication has been received from timer 6.
  • Unit 7 terminates the measurement of the defrost time interval when the temperature measured by sensor 22 at the evaporator has reached the preset defrost temperature.
  • Unit 7 outputs the actual defrost duration thus determined to a comparator 8a.
  • Comparator 8a compares the actual defrost duration measured by unit 7 with a target defrost duration value and outputs a difference between the actual defrost duration and the target defrost duration to a unit 8b which calculates a new refrigeration period time limit based on the deviation of the actual defrost duration from the target defrost duration value.
  • the calculated time limit in turn is input into timer 6 for setting the next refrigeration period time limit.
  • Reference numeral 13 denotes an electric heater arranged to supply heat to the evaporator when the same is defrosted.
  • Heater 13 can be in thermal contact with the evaporator or can be arranged elsewhere within the food compartment.
  • Heater 13 can be a resistive or inductive heating element or can be a light bulb for illuminating the food compartment.
  • the heater 13 is switched on to receive electric power from the mains whenever timer 6 outputs an inhibit signal to refrigeration controller 4 to perform a defrost operation.
  • Reference numeral 19 denotes means for detecting a voltage level of the mains supplying the refrigerator with power.
  • the mains voltage level detected by unit 19 is input into a unit 10 for determining a target defrost duration value on the basis of the detected mains voltage.
  • the target defrost duration thus determined is input into comparator 8a.
  • the mains voltage detector 19 is a simple detector circuit consisting of a rectifier diode, a smoothing capacitor connected to that diode and a resistive voltage divider network for lowering the voltage across the capacitor down to a level that can be handled by an Analog to Digital converter circuit.
  • Unit 10 for determining a target defrost duration receives the detected mains voltage level and converts it into a digital value. This digital mains voltage level value is then used by unit 10 to look up a table storing target defrost duration values for a variety of different mains voltage level values.
  • the target defrost duration value looked up in the table of unit 10 is either input into comparator 8a for digitally determining a deviation between the actual defrost duration and the target defrost duration value, or unit 10 converts a value read from its look up table into an analogue value for further processing in comparator 8a.
  • the controller 1 of this embodiment is implemented in digital technology by means of programming the functions of the timer 6, the unit 7 for measuring the defrost duration, the comparator 8a, the unit 8b for calculating a new refrigeration time limit and the unit 10 into a micro controller.
  • the micro controller preferably has A/D conversion means on the chip for processing the analogue signals provided by temperature sensor 22 and the mains voltage level detector 19.
  • the micro controller furthermore implements the control functions of refrigeration controller 4.
  • unit 10 stores a table with different target defrost duration values associated with different mains voltage levels and preferably, moreover with different thermal dispersion values.
  • the determination of the target defrost duration in accordance with the detected power supply condition and possibly other parameters like detected thermal dispersion can be implemented in a variety of different ways.
  • the target defrost duration can be determined depending on these parameters without actually changing a target defrost duration value if the measured value indicating the duration of the defrost time interval is modified in accordance with these parameters before judging on the basis of the modified defrost time interval duration value whether an adjustment of the refrigeration period time limit is necessary.
  • the existence of an explicit target defrost duration value and an explicit comparison of the defrost time interval duration with the target defrost duration is by no means mandatory for implementing a controller in accordance with the principles of the present invention.
  • Fig. 2b shows a modification of the embodiment of Fig. 2a.
  • reference numeral 14 denotes a unit that receives from unit 7 a value indicative of the measured defrost time interval duration.
  • Unit 14 furthermore receives from detector 19 a value indicative of the power supply condition of the refrigerator, e.g. the mains voltage level.
  • Unit 14 modifies the received defrost time interval duration value in accordance with the received power supply condition value and outputs the modified duration value to unit 8b that calculates the next refrigeration period time limit based on the modified duration value received from unit 14.
  • Unit 8b can be implemented in the form of a table that associates refrigeration period time limits to a variety of received duration values. Instead of using tables unit 8b can of course evaluate an analytical function that relates refrigeration period time limits to modified defrost duration values received from unit 14.
  • the entity t real denotes the measured defrost duration.
  • the entity t rated is a modified defrost duration value that takes into account the variation of the thermal energy supplied by the heater during the defrost time interval as a function of a ratio between the rated mains voltage and the real mains voltage detected by unit 19.
  • t cor denotes a corrected defrost time interval duration value.
  • the value t cor is output to unit 8b for calculating the next refrigeration period time limit.
  • the mains voltage U real can be obtained for instance by means of sampling and preferably averaging the samples obtained during the defrost period.
  • Fig. 3 shows a second embodiment of a controller for controlling a defrost operation of a refrigerator in accordance with the present invention.
  • the embodiment of Fig. 3 differs from the embodiment of Fig. 2a in the provision of an ambient temperature detection means 9.
  • the ambient temperature detection means 9 receives a signal from temperature sensor 22 on the evaporator 2. It furthermore receives a signal from refrigeration controller 4 indicating the operating state of the compressor, that is whether the compressor is currently in the ON state or in the OFF state.
  • the embodiment of Fig. 3 is advantageous in that the ambient temperature detection means 9 does not require a separate temperature sensor for sensing the ambient temperature. Rather, the ambient temperature detection means 9 estimates thermal dispersion of the refrigerator based on the temperature curve of the evaporator temperature 22. Preferably, the ambient temperature detection means 9 calculates a rate of rise of evaporator temperature when the compressor is off.
  • rates of rise or fall can be measured either over a constant time period or over a constant temperature change.
  • a simple way to determine the rate of change over a constant temperature is to measure the time t off that the compressor is off and the time t on that the compressor is on, during normal temperature regulation of the refrigeration controller 4, that is in the course of a refrigeration period.
  • the ratio t on /t off is essentially equivalent to the ratio of the rate of rise of evaporator temperature when the compressor is off to the rate of fall of evaporator temperature when the compressor is on, as long as the low temperature threshold and the high temperature threshold used by the refrigeration controller 4 controlling the compressor 3, remain unchanged.
  • the ambient temperature detection means 9 is adapted to evaluate the thermal dispersion of the refrigerator from the ratio of t on /t off , then the ambient temperature detection means 9 need not receive a signal from temperature sensor 22.
  • the thermal dispersion ratio is preferably calculated by unit 9 on a continuous basis in the course of every refrigeration period. Each time the compressor changes its operating state from ON to OFF or from OFF to ON, unit 9 provides a new value for the thermal dispersion ratio to unit 10.
  • unit 10 has a look up storing target defrost duration values for a variety of different mains voltage level values and for a variety of different thermal dispersion values.
  • target defrost duration values for a variety of different mains voltage level values and for a variety of different thermal dispersion values.
  • the thermal dispersion detection means 9 In order to avoid an adverse influence of disturbing factors like frequent or long door openings or the introduction of extremely or cold goods into the food compartment onto the evaluation of the thermal dispersion it is advantageous to provide the thermal dispersion detection means 9 with means for detecting whether said calculated thermal dispersion ratio is stable or not.
  • unit 9 can be provided with memory locations for storing a predetermined number of preceding thermal dispersion ratios, and with means for investigating whether the stored thermal dispersion ratios differ from each other by more than a predetermined threshold variance. Each time a new thermal dispersion ratio is calculated by unit 9, the oldest thermal dispersion ratio in said memory locations is replaced by the newest. If the differences between the stored thermal dispersion ratios is smaller than said predetermined variance threshold, the detected thermal dispersion ratio will then be used by unit 10 for calculating an updated target defrost duration value on the basis of the detected ambient conditions.
  • unit 10 will maintain unchanged the target defrost duration value output to unit 8a unchanged until the conditions for detecting a thermal dispersion ratio have been stabilized, that is, until all thermal dispersion ratios stored in unit 9 differ from each other by no more than said predetermined variance threshold.
  • Unit 8b for determining an updated refrigeration period time limit based on a deviation of the actual defrost duration from the target defrost duration given by unit 10 can be provided to increase the refrigeration period time limit each time the actual defrost duration is smaller than the target defrost duration, and to decrease the refrigeration period time limit each time the actual defrost duration has been found to be larger than the target defrost duration.
  • unit 8b may contain a look up table storing a plurality of refrigeration period time limits in association with respective defrost duration deviation values.
  • Unit 7 for measuring the actual defrost duration comprises a time counter the operation of which is started when receiving an end of refrigeration period signal from timer 6.
  • the time counter stops counting when a comparator for comparing the actual evaporator temperature from temperature sensor 22 with a preset defrost temperature value indicates that the evaporator temperature 22 has reached the preset defrost temperature.
  • unit 7 outputs the end of defrost signal to trigger timer 6 for starting a new refrigeration period.
  • Unit 7 then furthermore outputs the actual defrost duration value to comparator 8a.
  • Fig. 3 can be modified in a way similar to the modifications shown and described in Fig. 2b.
  • modification unit 14 modifies the measured defrost duration in accordance with the detected mains voltage level and in accordance with the detected thermal dispersion of the refrigerator.
  • Fig. 4a shows a third embodiment of a controller according to the present invention. This embodiment differs from the embodiment shown in Fig. 2a in the provision of a unit 11 for updating the refrigeration period time limit set in timer 6. Unit 11 for updating the time limit of timer 6 receives an input from a door position sensor 12. All remaining elements of Fig. 4a are identical with the corresponding elements of Fig. 2a and are denoted with the same reference numerals, such that their description need not be repeated.
  • Fig. 4a addresses the problem that the refrigeration period time limit calculated in unit 8b and set in timer 6 has been determined on the basis of the duration of the preceding defrost operation. If in the course of the refrigeration period there are frequent or long lasting door openings, the time limit for the refrigeration period calculated by unit 8b is no longer up to date.
  • Unit 11 for updating the refrigeration period time limit counts the total time for which the door of the food compartment of the refrigerator is open during the refrigeration period. The total time count is received by timer 6, and the timer 6 subtracts the current total time count from the current period of time left until the refrigeration period time limit is reached. As soon as the updated refrigeration period time limit has been reached, the defrost period starts and the timer means 6 outputs a signal to unit 11 to reset the open door time counter.
  • the controller according to this embodiment is able to reduce the refrigeration period based on an estimation of additional ice accumulation due to door openings without waiting for the next measurement of a defrost duration. A controller according to this embodiment can, therefore, quickly cope with changes in the actual icing conditions of the evaporator and keep the defrost operation of the refrigerator energy-efficient.
  • unit 11 can be provided to count the number of door openings during the refrigeration period. This alternative is, however, inferior to counting the total door open time period in that it will not be able to appropriately react to the situation that the door of the food compartment is opened and left open.
  • Fig. 4a While the embodiment of Fig. 4a includes a unit 10 for calculating a target defrost duration and a unit 19 for detecting a mains voltage level of the refrigerator, the units 9 and 10 are not essential for solving the problem to enable a controller for controlling a defrost operation of a refrigerator to quickly react to changes of the icing conditions of the evaporator due to frequent or long lasting door openings.
  • Fig. 4b is a time chart illustrating the behavior of the evaporator temperature and the sequence of refrigeration periods and defrost periods according to the third embodiment shown in Fig. 4a.
  • the time chart of Fig. 4b shows a refrigeration period n and the evaporator temperature T in the course of that refrigeration period n. No door openings take place during that period n.
  • an n th defrost operation takes place.
  • the measured duration of the n th defrost period influences the duration of the subsequent refrigeration period (n+1).
  • door openings take place, as indicated in the bottom part of Fig. 4b.
  • Updating the refrigeration period time limit on the basis of door openings furthermore has the effect that also the (n+1) st defrost duration is not significantly different from the n th defrost duration since the increased accumulation of ice on the evaporator due to the door of the refrigerator having been open is compensated by means of advancing the next defrost operation, such that both in refrigeration period n and in refrigeration period n+1 the peak amount of ice accumulated on the evaporator is substantially the same.
  • Fig. 4a can be modified in a variety of different ways.
  • the modifications described in connection with Fig. 2b are of course applicable also to the embodiment of Fig. 4a.

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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)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP20000117310 2000-08-18 2000-08-18 Dispositif de commande et procédé pour commander l'opération de dégivrage dans un réfrigérateur Expired - Lifetime EP1180652B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2000630971 DE60030971T2 (de) 2000-08-18 2000-08-18 Steuervorrichtung und Verfahren zum Steuern des Abtauvorgangs in einem Kühlschrank
EP20000117310 EP1180652B1 (fr) 2000-08-18 2000-08-18 Dispositif de commande et procédé pour commander l'opération de dégivrage dans un réfrigérateur
TR2001/02371A TR200102371A2 (tr) 2000-08-18 2001-08-16 Bir buzdolabìnda eritme içleminin kontrol edilmesi i‡in kontrol cihazì ve y”ntem.

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Application Number Priority Date Filing Date Title
EP20000117310 EP1180652B1 (fr) 2000-08-18 2000-08-18 Dispositif de commande et procédé pour commander l'opération de dégivrage dans un réfrigérateur

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EP1180652A1 true EP1180652A1 (fr) 2002-02-20
EP1180652B1 EP1180652B1 (fr) 2006-09-27

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EP (1) EP1180652B1 (fr)
DE (1) DE60030971T2 (fr)
TR (1) TR200102371A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003098134A1 (fr) * 2002-05-16 2003-11-27 BSH Bosch und Siemens Hausgeräte GmbH Appareil de congelation pourvu d'une fonction de degivrage et son procede de fonctionnement
WO2004088223A1 (fr) * 2003-04-04 2004-10-14 BSH Bosch und Siemens Hausgeräte GmbH Procede pour reguler la puissance d'une resistance de degivrage et appareil frigorique a resistance de degivrage integree
WO2005083337A1 (fr) 2004-02-24 2005-09-09 Carrier Corporation Procede adaptatif de degivrage
RU2504721C2 (ru) * 2008-12-18 2014-01-20 Бсх Бош Унд Сименс Хаусгерете Гмбх Холодильный аппарат с размораживателем
CN115183514A (zh) * 2022-06-14 2022-10-14 海信（山东）冰箱有限公司 冰箱及压缩机转速控制方法

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EP2811244A3 (fr) 2013-06-07 2015-04-22 Indesit Company Beyaz Esya San.Ve Tic A.S. Cartouche d'absorbeur d'humidité utilisée dans les conduites d'air de réfrigérateurs

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2945691A1 (de) 1978-12-08 1980-06-19 Amf Inc Verfahren und vorrichtung zum entfrosten bzw. abtauen einer waermetauschereinheit, vorzugsweise einer verdampferschlange, einer temperatur-konditionierungseinrichtung
US4327557A (en) * 1980-05-30 1982-05-04 Whirlpool Corporation Adaptive defrost control system
DE3235642A1 (de) * 1982-09-25 1984-03-29 3 E Elektronik-Elektro-Energieanlagen Baugesellschaft mbH, 5500 Trier Einrichtung zur elektrischen abtauregelung fuer den verdampfer einer kaelteanlage
US4528821A (en) * 1982-07-28 1985-07-16 Whirlpool Corporation Adaptive demand defrost control for a refrigerator
US4689965A (en) * 1985-12-27 1987-09-01 Whirlpool Corporation Adaptive defrost control for a refrigerator
EP0278701A2 (fr) * 1987-02-06 1988-08-17 York International Ltd Système de dégivrage d'échangeurs de chaleur
US5148686A (en) * 1990-08-16 1992-09-22 Samsung Electronics Co., Ltd. Defrost control apparatus for a refrigeration system
EP0598612A2 (fr) * 1992-11-18 1994-05-25 Whirlpool Corporation Dispositif de commande de cycle de décongélation
US5440893A (en) * 1994-02-28 1995-08-15 Maytag Corporation Adaptive defrost control system
EP0690277A1 (fr) * 1994-05-30 1996-01-03 Bosch-Siemens HausgerÀ¤te GmbH Dispositif de commande d'une installation de refroidissement ou congélation
US5515692A (en) * 1993-12-09 1996-05-14 Long Island Lighting Company Power consumption determining device and method
EP1030137A1 (fr) * 1999-02-19 2000-08-23 Ranco Incorporated of Delaware Dispositif de commande et procédé pour commander l'opération de dégivrage dans un réfrigérateur

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2945691A1 (de) 1978-12-08 1980-06-19 Amf Inc Verfahren und vorrichtung zum entfrosten bzw. abtauen einer waermetauschereinheit, vorzugsweise einer verdampferschlange, einer temperatur-konditionierungseinrichtung
US4327557A (en) * 1980-05-30 1982-05-04 Whirlpool Corporation Adaptive defrost control system
US4528821A (en) * 1982-07-28 1985-07-16 Whirlpool Corporation Adaptive demand defrost control for a refrigerator
DE3235642A1 (de) * 1982-09-25 1984-03-29 3 E Elektronik-Elektro-Energieanlagen Baugesellschaft mbH, 5500 Trier Einrichtung zur elektrischen abtauregelung fuer den verdampfer einer kaelteanlage
US4689965A (en) * 1985-12-27 1987-09-01 Whirlpool Corporation Adaptive defrost control for a refrigerator
EP0278701A2 (fr) * 1987-02-06 1988-08-17 York International Ltd Système de dégivrage d'échangeurs de chaleur
US5148686A (en) * 1990-08-16 1992-09-22 Samsung Electronics Co., Ltd. Defrost control apparatus for a refrigeration system
EP0598612A2 (fr) * 1992-11-18 1994-05-25 Whirlpool Corporation Dispositif de commande de cycle de décongélation
US5515692A (en) * 1993-12-09 1996-05-14 Long Island Lighting Company Power consumption determining device and method
US5440893A (en) * 1994-02-28 1995-08-15 Maytag Corporation Adaptive defrost control system
EP0690277A1 (fr) * 1994-05-30 1996-01-03 Bosch-Siemens HausgerÀ¤te GmbH Dispositif de commande d'une installation de refroidissement ou congélation
EP1030137A1 (fr) * 1999-02-19 2000-08-23 Ranco Incorporated of Delaware Dispositif de commande et procédé pour commander l'opération de dégivrage dans un réfrigérateur

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003098134A1 (fr) * 2002-05-16 2003-11-27 BSH Bosch und Siemens Hausgeräte GmbH Appareil de congelation pourvu d'une fonction de degivrage et son procede de fonctionnement
US7320226B2 (en) 2002-05-16 2008-01-22 Bsh Bosch Und Siemens Hausgeraete Gmbh Freezer with defrost function and method for operating the freezer
CN100374800C (zh) * 2002-05-16 2008-03-12 Bsh博施及西门子家用器具有限公司 具有除霜功能的冷冻器具以及其运行方法
WO2004088223A1 (fr) * 2003-04-04 2004-10-14 BSH Bosch und Siemens Hausgeräte GmbH Procede pour reguler la puissance d'une resistance de degivrage et appareil frigorique a resistance de degivrage integree
CN100385187C (zh) * 2003-04-04 2008-04-30 Bsh博世和西门子家用器具有限公司 除霜加热装置的功率调节方法和具有集成的除霜加热装置的致冷装置
WO2005083337A1 (fr) 2004-02-24 2005-09-09 Carrier Corporation Procede adaptatif de degivrage
EP1725819A1 (fr) * 2004-02-24 2006-11-29 Carrier Corporation Procede adaptatif de degivrage
EP1725819A4 (fr) * 2004-02-24 2010-12-22 Carrier Corp Procede adaptatif de degivrage
RU2504721C2 (ru) * 2008-12-18 2014-01-20 Бсх Бош Унд Сименс Хаусгерете Гмбх Холодильный аппарат с размораживателем
CN115183514A (zh) * 2022-06-14 2022-10-14 海信（山东）冰箱有限公司 冰箱及压缩机转速控制方法

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EP1180652B1 (fr) 2006-09-27
TR200102371A3 (tr) 2002-03-21
TR200102371A2 (tr) 2002-03-21
DE60030971D1 (de) 2006-11-09

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