CN113048709B - Refrigerator and control method thereof - Google Patents
Refrigerator and control method thereof Download PDFInfo
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- CN113048709B CN113048709B CN201911367448.6A CN201911367448A CN113048709B CN 113048709 B CN113048709 B CN 113048709B CN 201911367448 A CN201911367448 A CN 201911367448A CN 113048709 B CN113048709 B CN 113048709B
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- 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
- F25D29/00—Arrangement or mounting of control or safety devices
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- 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
- F25D21/004—Control mechanisms
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- 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
- F25D2600/00—Control issues
- F25D2600/02—Timing
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- 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
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
Abstract
The invention provides a refrigerator and a control method thereof, wherein the control method of the refrigerator comprises the following steps: acquiring a starting signal of a refrigerating system of the refrigerator; judging whether the triggering condition for starting the refrigeration system is temperature rise caused by door opening and closing actions; if so, acquiring a temperature variation value caused by door opening and closing actions, and determining a cooling rate threshold according to the temperature variation value; obtaining a cooling rate in the refrigerator; judging whether the cooling rate exceeds a cooling rate threshold value; if yes, the refrigerator is determined to need to start the defrosting mode. The invention starts from the actual frosting condition of the refrigerator, judges whether the refrigerator needs defrosting by utilizing the cooling rate, and can accurately determine whether the refrigerator needs to start the defrosting mode, thereby realizing defrosting according to the requirement, reducing or avoiding the problems of poor refrigeration effect and high energy consumption caused by untimely defrosting and too frequent defrosting, and improving the intelligent degree.
Description
Technical Field
The invention relates to a refrigerator, in particular to a refrigerator and a control method thereof.
Background
In the prior art, in the starting operation process of some refrigerators, defrosting is performed according to a fixed time interval. However, the actual factors affecting the frosting of the evaporator are complex and variable, and are not determined by only a single factor of the running time, so that whether the refrigerator needs to be defrosted cannot be accurately judged by only depending on the running time, the defrosting is possibly not timely, the refrigeration efficiency of the refrigerator is low, and the problem of frequent defrosting is possibly caused, and the energy consumption is too high.
Therefore, how to accurately determine whether the defrosting mode needs to be started or not becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
An object of the present invention is to provide a refrigerator and a control method thereof that solve at least any one of the above-mentioned technical problems.
A further object of the present invention is to accurately determine whether a refrigerator needs to activate a defrost mode.
A further object of the present invention is to improve the reliability of the operation of the refrigerator.
Another further object of the present invention is to improve the freshness-keeping effect of the refrigerator.
According to an aspect of the present invention, there is provided a control method of a refrigerator, including: acquiring a starting signal of a refrigerating system of the refrigerator; judging whether the triggering condition for starting the refrigeration system is temperature rise caused by door opening and closing actions; if so, acquiring a temperature variation value caused by door opening and closing actions, and determining a cooling rate threshold according to the temperature variation value; acquiring the cooling rate in the refrigerator; judging whether the cooling rate exceeds a cooling rate threshold value; if yes, the refrigerator is determined to need to start the defrosting mode.
Optionally, the step of acquiring a temperature variation value caused by the door opening and closing action comprises: acquiring the temperature of a storage compartment of the refrigerator, which is obtained by the last detection before the refrigerator is opened, and recording the temperature as a first temperature; acquiring the temperature of the storage chamber detected after the refrigerator is closed for a first set time, and recording the temperature as a second temperature; and calculating the difference between the second temperature and the first temperature to obtain a temperature variation value.
Optionally, the step of obtaining the cooling rate in the refrigerator includes: obtaining a cooling rate after a second set time after the refrigeration system is started, and recording the cooling rate as a first cooling rate; obtaining a cooling rate after a third set time after the refrigeration system is started, and recording the cooling rate as a second cooling rate; wherein the third setting time is longer than the second setting time.
Optionally, the cooling rate threshold comprises: a first rate reference as a first cooling rate judgment basis and a second rate reference as a second cooling rate judgment basis; the step of judging whether the cooling rate exceeds the cooling rate threshold value comprises the following steps: judging whether the first cooling rate exceeds a first rate reference and whether the second cooling rate exceeds a second rate reference; if yes, determining that the cooling rate exceeds a cooling rate threshold value.
Optionally, the cooling rate threshold corresponds to a preset temperature variation range, and the step of determining the cooling rate threshold according to the temperature variation value includes: determining the temperature variation range to which the temperature variation value belongs; and determining a cooling rate threshold according to the temperature variation range.
Optionally, the control method further includes: if the triggering condition for starting the refrigeration system is not temperature rise caused by door opening and closing actions, acquiring the external environment temperature of the refrigerator; determining a temperature difference change rate threshold according to the external environment temperature; acquiring the temperature difference change rate between the temperature of a storage compartment of the refrigerator and the temperature of an evaporator of the refrigerator; judging whether the temperature difference change rate exceeds a temperature difference change rate threshold value or not; if yes, the refrigerator is determined to need to start the defrosting mode.
Optionally, the step of obtaining a rate of change of a temperature difference between a temperature of a storage compartment of the refrigerator and a temperature of an evaporator of the refrigerator comprises: acquiring the temperature of a storage chamber and the temperature of an evaporator; and calculating the change rate of the difference value between the temperature of the storage chamber and the temperature of the evaporator in the fourth set time to obtain the temperature difference change rate.
Optionally, the temperature difference change rate threshold corresponds to a preset external environment temperature range, and the step of determining the temperature difference change rate threshold according to the external environment temperature includes: determining an external environment temperature range to which the external environment temperature belongs; and determining a temperature difference change rate threshold according to the external environment temperature range.
Optionally, after the step of determining that the refrigerator needs to start the defrosting mode, the method further comprises: driving an air supply fan of the refrigerator to operate at a preset highest rotating speed; after the refrigerating system and the air supply fan operate for a preset refrigerating time, the refrigerator is driven to enter a defrosting mode.
According to another aspect of the present invention, there is also provided a refrigerator including: a box body, wherein a storage compartment is formed inside the box body; a control device, comprising: a processor and a memory, the memory having stored therein a control program for implementing the control method according to any one of the above when the control program is executed by the processor.
According to the refrigerator and the control method thereof, when the triggering condition for starting the refrigeration system is that the door opening and closing action causes the temperature of the storage chamber of the refrigerator to rise, the temperature reduction rate threshold is determined according to the temperature change value caused by the door opening and closing action, and when the temperature reduction rate of the storage chamber exceeds the temperature reduction rate threshold, the refrigerator is determined to need to start the defrosting mode. The thickness of the frost layer of the evaporator of the refrigerator directly influences the refrigeration efficiency, and the refrigeration efficiency can be judged by the cooling rate of the storage chamber. The invention starts from the actual frosting condition of the refrigerator, judges whether the refrigerator needs defrosting by utilizing the cooling rate, and can accurately determine whether the refrigerator needs to start the defrosting mode, thereby realizing defrosting according to needs, and reducing or avoiding the problems of poor refrigeration effect and high energy consumption caused by untimely defrosting and too frequent defrosting.
Further, according to the refrigerator and the control method thereof, whether the refrigerator needs defrosting or not can be determined according to the cooling rate of the storage chamber under the condition that the triggering condition for starting the refrigeration system is that the door opening and closing action causes the temperature of the storage chamber of the refrigerator to rise, and whether the refrigerator needs defrosting or not can be determined according to the temperature difference change rate between the temperature of the storage chamber and the temperature of the evaporator under the condition that the triggering condition for starting the refrigeration system is not that the door opening and closing action causes the temperature of the storage chamber of the refrigerator to rise.
Further, according to the refrigerator and the control method thereof, under the condition that the refrigerator needs to start the defrosting mode, the air supply fan is driven to operate at the preset highest rotating speed, and after the refrigerating system and the air supply fan operate for the preset refrigerating time, the refrigerator is driven to enter the defrosting mode. In when presetting long, the high-speed operation of air supply fan promotes cold volume to the transmission of storing room, can make the storing room temperature reduce fast to build out low temperature storing environment, can reduce or avoid the follow-up frost melting mode that goes on to cause great destruction to the storing environment, improved the fresh-keeping effect of refrigerator.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily to scale. In the drawings:
fig. 1 is a schematic block diagram of a refrigerator according to one embodiment of the present invention;
fig. 2 is a schematic view of a control method of a refrigerator according to one embodiment of the present invention;
fig. 3 is a control flowchart of a refrigerator according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic block diagram of a refrigerator 10 according to one embodiment of the present invention.
The refrigerator 10 may generally include: the refrigerator comprises a box body, a refrigerating system 300, an air supply fan 500, a temperature sensor 100, a defrosting sensor 200 and a control device 400. The refrigeration system 300 may be a conventional compression refrigeration system 300 that provides refrigeration to the storage compartment, for example, by means of air cooling and/or direct cooling, to provide the storage compartment with a desired storage temperature.
The box, its inside storage compartment that forms. The box body can be provided with a door body for opening or closing the storage compartment. In this embodiment, the storage compartment may be one, for example, a freezing compartment, and in some optional embodiments, the storage compartments may also be multiple, including at least a freezing compartment and a refrigerating compartment. An evaporator installation cavity and an air supply duct which are positioned at the rear side of the storage compartment are formed in the box body. An air supply outlet and an air return inlet are arranged between the air supply duct and the storage chamber. The refrigeration system 300 includes at least an evaporator. The evaporator is arranged in the evaporator installation cavity, namely, the evaporator is arranged on the rear side of the storage compartment. And the air supply fan 500 can be arranged in the air supply duct and is positioned above the evaporator. The air supply airflow after heat exchange with the evaporator can enter the storage chamber from the air supply outlet under the action of the air supply fan 500, flows through the inside of the storage chamber and then flows into the air return inlet, and the flow channel of the air supply airflow forms an air supply duct.
The temperature sensor 100 is provided in the storage compartment, for example, may be provided on an inner wall of the storage compartment, and is configured to detect a temperature of the storage compartment. The temperature sensor 100 may detect the temperature of the storage compartment at predetermined intervals when the door of the refrigerator 10 is in a closed state.
The defrosting sensor 200 is disposed on the evaporator, for example, may be disposed at a bottom of the evaporator, and configured to detect a temperature of the evaporator. In the present embodiment, the frost sensor 200 may detect the temperature of the evaporator while the refrigeration system 300 is operating.
In some optional embodiments, the refrigerator 10 may further include: and the door opening and closing detection device is used for detecting the opening and closing state of the door of the refrigerator 10. Since the arrangement of the door opening/closing detection device is well known to those skilled in the art, it will not be described herein.
The control device 400 includes a memory 420 and a processor 410, wherein a control program 421 is stored in the memory 420, and the control program 421 is executed by the processor 410 to implement the control method of the air conditioner 10 according to any one of the following embodiments. The processor 410 may be a Central Processing Unit (CPU), or a digital processing unit (DSP), or the like. The memory 420 is used to store programs executed by the processor 410. The memory 420 may be any medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. Memory 420 may also be a combination of various memories 420. Since the control program 421 is executed by the processor 410 to implement the processes of the method embodiments described below and achieve the same technical effects, the detailed description is omitted here to avoid repetition.
With the following method, in the refrigerator 10 of the present embodiment, when the triggering condition for starting the refrigeration system 300 is that the door opening and closing action causes temperature rise in the storage compartment of the refrigerator 10, the temperature-lowering rate threshold is determined according to the temperature variation value caused by the door opening and closing action, and when the temperature-lowering rate of the storage compartment exceeds the temperature-lowering rate threshold, it is determined that the refrigerator 10 needs to start the defrosting mode. The thickness of the evaporator frost layer of the refrigerator 10 directly affects the refrigeration efficiency, and the level of the refrigeration efficiency can be determined by the cooling rate of the storage compartment. Whether the refrigerator 10 needs to be defrosted or not is judged by utilizing the cooling rate from the actual frosting condition of the refrigerator 10 in the embodiment, and whether the defrosting mode needs to be started or not can be accurately determined, so that defrosting as required is realized, and the problems of poor refrigeration effect and high energy consumption caused by untimely defrosting and too frequent defrosting are reduced or avoided.
Fig. 2 is a schematic diagram of a control method of the refrigerator 10 according to one embodiment of the present invention. The control method of the refrigerator 10 may generally include:
in step S202, a start signal of the refrigeration system 300 of the refrigerator 10 is acquired.
Since the user may open the refrigerator 10 to take and put the food material at any time, when the door of the refrigerator 10 is opened in the use state, the environment inside and outside the storage compartment is communicated, so that the loss of the cooling capacity inside the refrigerator 10 is caused, the temperature inside the storage compartment is increased due to the loss of the cooling capacity, and the refrigeration system 300 is started to operate to supply the cooling capacity to the storage compartment after the door of the refrigerator 10 is closed. Since the refrigerator 10 is not a hermetic refrigeration device, even if the door of the refrigerator 10 is not opened, the cooling capacity in the storage compartment is still dissipated, that is, the refrigeration system 300 is periodically started to supplement the cooling capacity to the storage compartment when the door of the refrigerator 10 is not opened for a long time.
In step S204, it is determined whether the triggering condition for starting the refrigeration system 300 is temperature rise due to door opening and closing.
In order to keep a good low-temperature fresh-keeping atmosphere in the storage chamber, the refrigeration system 300 of the refrigerator 10 is started to provide cold energy for the storage chamber. The triggering conditions for the start-up of the refrigeration system 300 may include at least: temperature rise due to door opening and closing actions and periodic starting under the condition of long-time door opening.
In step S206, if the triggering condition for starting the refrigeration system 300 is temperature rise caused by door opening and closing, a temperature variation value caused by door opening and closing is obtained, and a temperature reduction rate threshold is determined according to the temperature variation value.
The door opening and closing action leads to the cold energy of the storage chamber to be dissipated, and the temperature of the storage chamber after the door body of the refrigerator 10 is closed is higher than that of the storage chamber before the door body of the refrigerator 10 is opened. The temperature variation value is a variation value of the temperature of the storage compartment caused by the action of opening and closing the door.
The step of acquiring the temperature variation value caused by the door opening and closing action comprises the following steps: acquiring the temperature of the storage chamber of the refrigerator 10 detected for the last time before the door of the refrigerator 10 is opened, and recording as a first temperature; acquiring the temperature of the storage chamber detected after the refrigerator 10 is closed for a first set time, and recording the temperature as a second temperature; and calculating the difference value between the second temperature and the first temperature to obtain a temperature variation value. Before the door of the refrigerator 10 is opened, the temperature sensor 100 detects the temperatures of the plurality of storage compartments at preset intervals, and the temperature of the storage compartment detected at the last time before the door of the refrigerator 10 is opened is the temperature of the storage compartment before the door of the refrigerator 10 is opened. After the refrigerator 10 is closed for the first set time, the air inside the storage compartment is uniformly mixed and has uniform temperature, and the temperature detected by the temperature sensor 100 can reflect the actual temperature of the storage compartment after the door is closed.
The temperature reduction rate threshold value corresponds to a preset temperature variation range, and the step of determining the temperature reduction rate threshold value according to the temperature variation value comprises the following steps: determining the temperature variation range to which the temperature variation value belongs; and determining a cooling rate threshold according to the temperature variation range.
The cooling rate threshold value is a judgment standard for judging whether the cooling rate of the storage chamber is at a reasonable level or not. The heating caused by the opening and closing of the door may produce a number of different temperature variations. The temperature variation values of the storage compartments are different, and the cooling capacities of the storage compartments are different, so that the cooling rates of the storage compartments after the refrigeration system 300 is started and operated may be different. And comprehensively analyzing the different temperature variation values and the cooling rate to obtain the corresponding relation between the cooling rate threshold and the preset temperature variation range. The temperature variation range is a plurality of ranges, and different temperature reduction rate thresholds are respectively corresponded to the ranges. The temperature variation value in each temperature variation range corresponds to a corresponding temperature reduction rate threshold value.
In step S208, the cooling rate in the refrigerator 10 is acquired. The cooling rate within the refrigerator 10 refers to the cooling rate within the storage compartment of the refrigerator 10.
The step of obtaining the cooling rate in the refrigerator 10 includes: obtaining a cooling rate after a second set time after the refrigeration system 300 is started, and recording the cooling rate as a first cooling rate; obtaining a cooling rate after a third set time after the refrigeration system 300 is started, and recording the cooling rate as a second cooling rate; wherein the third setting time is greater than the second setting time.
The refrigeration system 300 is started to operate to convey cold energy to the storage chamber, and the temperature of the storage chamber is reduced. When the refrigerator 10 has no frost or a small amount of frost, the heat exchange efficiency of the evaporator is high, and the cooling rate of the storage compartment is high. When the amount of frost in the refrigerator 10 is large, the frost layer covers the evaporator, which reduces the heat exchange efficiency between the evaporator and the ambient air, thereby reducing the refrigeration efficiency of the refrigerator 10, and further reducing the cooling rate of the storage compartment to a reasonable level.
The cooling rate is the rate at which the temperature of the storage compartment decreases when the refrigeration system 300 is operating. The first cooling rate is a ratio of a temperature drop value within a second set time after the refrigeration system 300 is started to a corresponding time, and the second cooling rate is a ratio of a temperature drop value within a third set time after the refrigeration system 300 is started to a corresponding time. In this embodiment, the second setting time and the third setting time may be set according to actual needs, for example, the second setting time may be any time within a range of 3min to 8min, the third setting time may be any time within a range of 0.5h to 1.5h, preferably, the second setting time may be 5min, and the third setting time may be 1h.
The first cooling rate reflects the cooling efficiency in a short time after the refrigerator 10 starts cooling (i.e., the cooling efficiency in the primary stage), and the second cooling rate reflects the cooling efficiency in a longer time after the refrigerator 10 starts cooling (i.e., the cooling efficiency in the plateau stage). The refrigerating efficiency of the primary stage can reflect the influence of the door opening and closing action on the temperature of the storage room, and generally, the higher the refrigerating efficiency of the primary stage is, the greater the influence of the door opening and closing action on the temperature of the storage room is. The refrigerating efficiency in the stability approaching stage can reflect the influence of the frost layer thickness on the temperature of the storage compartment, and the higher the refrigerating efficiency in the stability approaching stage is, the smaller the frost layer thickness is, and the better the refrigerating effect is.
After the refrigeration system 300 is started, the cooling rates in two different times are obtained, so that the refrigeration efficiencies in two stages in the operation process of the refrigeration system 300 can be determined, that is, the refrigeration efficiency in the primary stage of starting and operating the refrigeration system 300 and the refrigeration efficiency in the stability approaching stage of starting and operating the refrigeration system 300 can be respectively determined, and whether the refrigerator 10 needs defrosting or not is determined together by using the two parameters of the refrigeration efficiency in the initial stage and the refrigeration efficiency in the stability approaching stage as judgment bases, so that the accuracy of the determination process is improved.
The magnitude of the cool down rate is influenced by both the door opening and closing action and the operation of the refrigerant system 300. In order to accurately determine whether the actual cooling rate in the storage compartment exceeds a reasonable level, that is, whether the actual cooling rate exceeds the cooling rate threshold when the refrigeration system 300 operates, the present embodiment determines the cooling rate threshold according to the temperature variation value, that is, determines the cooling rate threshold corresponding to the temperature rise condition caused by the door opening and closing action, so that the interference of the temperature rise condition caused by the door opening and closing action on the determination can be reduced or avoided.
Step S210, determining whether the cooling rate exceeds a cooling rate threshold.
The cool down rate threshold includes: a first rate reference as a first cooling rate judgment basis and a second rate reference as a second cooling rate judgment basis; the step of judging whether the cooling rate exceeds the cooling rate threshold value comprises the following steps: judging whether the first cooling rate exceeds a first rate reference or not and whether the second cooling rate exceeds a second rate reference or not; if yes, determining that the cooling rate exceeds a cooling rate threshold value.
In this embodiment, the temperature variation ranges may be three, four, five or six, preferably four, and are respectively a first temperature variation range, a second temperature variation range, a third temperature variation range and a fourth temperature variation range. The first temperature variation range may be (0,7) ° c, the second temperature variation range may be [7, 16) ° c, the third temperature variation range may be [16,21) ° c, and the fourth temperature variation range may be a temperature greater than or equal to 21 ℃.
The greater the temperature fluctuation caused by the door opening and closing action, the greater the cooling rate. The first rate reference of the cooling rate threshold corresponding to the first temperature variation range may be a value greater than 0.8 ℃/min and the second rate reference may be a value greater than 0.6 ℃/min. In some optional embodiments, when the temperature variation range to which the temperature variation value belongs is the first temperature variation range, only the first rate reference corresponding to the first temperature variation range may be used as a determination basis, and when the temperature reduction rate threshold is determined according to the temperature variation value to be the temperature reduction rate threshold corresponding to the first temperature variation range, if the first temperature reduction rate exceeds the range defined by the first rate reference of the temperature reduction rate threshold, it may be determined that the temperature reduction rate exceeds the temperature reduction rate threshold. Because the temperature variation value corresponding to the first temperature variation range is small, the door opening and closing action does not cause the storage compartment to generate large temperature fluctuation, after the door body of the refrigerator 10 is closed, the refrigeration system 300 is started to operate, the storage compartment can be rapidly cooled, and whether the refrigeration efficiency of the refrigerator 10 is at a reasonable level can be accurately determined only by judging whether the first cooling rate exceeds the range defined by the first rate reference of the cooling rate threshold value, wherein the refrigeration efficiency at the reasonable level means that the evaporator has no frost or has a small frost formation amount.
The first rate reference of the cooling rate threshold corresponding to the second temperature variation range may be a value greater than 1 ℃/min and the second rate reference may be a value greater than 0.7 ℃/min. The first rate reference of the cooling rate threshold corresponding to the third temperature variation range may be a value greater than 1.1 deg.c/min and the second rate reference may be a value greater than 1 deg.c/min. The first rate reference of the cooling rate threshold corresponding to the fourth temperature variation range may be a value greater than 1.15 ℃/min and the second rate reference may be a value greater than 1 ℃/min.
That is, the cooling rate threshold may be a range of values, and the cooling rate exceeding the cooling rate threshold means that the cooling rate is not within the range of values defined by the corresponding cooling rate threshold.
In step S212, if yes, it is determined that the refrigerator 10 needs to start the defrosting mode.
The control method further comprises the following steps: if the triggering condition for starting the refrigeration system 300 is not temperature rise caused by door opening and closing actions, acquiring the external environment temperature of the refrigerator 10, and determining a temperature difference change rate threshold according to the external environment temperature; acquiring the temperature difference change rate between the temperature of the storage compartment of the refrigerator 10 and the temperature of the evaporator of the refrigerator 10; judging whether the temperature difference change rate exceeds a temperature difference change rate threshold value or not; if yes, it is determined that the refrigerator 10 needs to start the defrosting mode.
If the triggering condition for starting the refrigeration system 300 is not temperature rise due to door opening and closing, it is determined that the triggering condition for starting the refrigeration system 300 is periodic starting under the condition that the door is not opened for a long time.
The external ambient temperature refers to the temperature of the ambient environment in which the refrigerator 10 is located. The threshold value of the temperature difference change rate is a preset judgment standard for judging whether the refrigerating efficiency of the refrigerator 10 is at a reasonable level. The temperature difference change rate refers to the speed of change of the temperature difference between the temperature of the storage chamber and the temperature of the evaporator.
Wherein, the temperature difference change rate threshold value corresponds to the external environment temperature scope of predetermineeing, and the step of confirming the temperature difference change rate threshold value according to external environment temperature includes: determining an external environment temperature range to which the external environment temperature belongs; and determining a temperature difference change rate threshold according to the external environment temperature range.
Under the condition that the door of the refrigerator 10 is kept closed, gas exchange occurs between the storage chamber and the external environment where the refrigerator 10 is located, so that the temperature of the storage chamber fluctuates, and therefore the refrigeration system 300 needs to be periodically started to supplement cold energy to the storage chamber. The external ambient temperature is influenced by the season and/or the weather, there being a plurality of different temperature values. And comprehensively analyzing different external environment temperatures and the temperature difference change rate to obtain the corresponding relation between the temperature difference change rate threshold and the preset external environment temperature range. The external environment temperature is a plurality of, and different temperature difference change rate thresholds are respectively corresponded to. The external environment temperature value in each external environment temperature range corresponds to a corresponding temperature difference change rate threshold value.
In this embodiment, the external ambient temperature ranges may be three, four, five or six, preferably four, respectively being a first external ambient temperature range, a second external ambient temperature range, a third external ambient temperature range and a fourth external ambient temperature range. The first external ambient temperature range may be a temperature equal to or higher than 28 ℃, the second external ambient temperature range may be [20, 28) ° c, the third external ambient temperature range may be [15,20) ° c, and the fourth external ambient temperature range may be a temperature less than 15 ℃.
The rate of change of temperature difference threshold corresponding to the first external ambient temperature range may be a value greater than 0.1 ℃/min, the rate of change of temperature difference threshold corresponding to the second external ambient temperature range may be a value greater than 0.12 ℃/min, the rate of change of temperature difference threshold corresponding to the third external ambient temperature range may be a value greater than 0.14 ℃/min, and the rate of change of temperature difference threshold corresponding to the fourth external ambient temperature range may be a value greater than 0.15 ℃/min.
That is, the threshold value of the temperature difference change rate may be a numerical range, and the temperature difference change rate exceeding the threshold value of the temperature difference change rate means that the temperature difference change rate is not within the numerical range defined by the threshold value of the corresponding temperature difference change rate.
The step of acquiring a temperature difference change rate between the storage compartment temperature of the refrigerator 10 and the evaporator temperature of the refrigerator 10 includes: acquiring the temperature of a storage compartment and the temperature of an evaporator; and calculating the change rate of the difference value between the temperature of the storage chamber and the temperature of the evaporator in the fourth set time to obtain the temperature difference change rate.
When the refrigeration system 300 is operated, the difference between the evaporator temperature and the storage compartment temperature is gradually decreased, and the rate of change of the difference is gradually decreased as the operation time of the refrigeration system 300 is extended. And in the fourth set time, if the temperature difference change rate exceeds the temperature difference change rate range defined by the temperature difference change rate threshold, namely determining that the temperature difference change rate exceeds the temperature difference change rate threshold, and determining that the refrigerator 10 needs to start the defrosting mode. The fourth setting time may be any time within 0.5h to 1.5h after the refrigeration system 300 is started, and may be 1h, for example.
By using the control method, when the triggering condition for starting the refrigeration system 300 is that the door opening and closing action causes the temperature of the storage chamber of the refrigerator 10 to rise, whether the refrigerator 10 needs defrosting can be determined according to the cooling rate of the storage chamber, and when the triggering condition for starting the refrigeration system 300 is not that the door opening and closing action causes the temperature of the storage chamber of the refrigerator 10 to rise, whether the refrigerator 10 needs defrosting can be determined according to the change rate of the temperature difference between the temperature of the storage chamber and the temperature of the evaporator.
After the step of determining that the refrigerator 10 needs to start the defrosting mode, the method further comprises the following steps: driving the air supply fan 500 of the refrigerator 10 to operate at a preset maximum rotation speed; after the refrigeration system 300 and the air supply fan 500 operate for a preset refrigeration time, the refrigerator 10 is driven to enter a defrosting mode.
When the refrigerating system 300 operates, the air supply fan 500 of the refrigerator 10 operates to force the low-temperature heat-exchange air having exchanged heat with the evaporator to flow to the storage compartment. Under the condition that it is determined that the refrigerator 10 needs to start the defrosting mode, the refrigeration system 300 and the air supply fan 500 operate according to the preset refrigeration time, and after the operation time reaches the preset refrigeration time, the refrigeration system 300 and the air supply fan 500 stop operating. The preset refrigeration time period can be set according to actual needs, and can be any time period within the range of 0.5h-1.5h, and preferably can be 0.5h.
In when presetting long, air supply fan 500 high-speed operation promotes cold volume to carry fast to the storing room, can make the storing room temperature reduce fast to build out low temperature storing environment, can reduce or avoid the follow-up frost melting mode that goes on to cause great destruction to the storing environment, improved refrigerator 10's fresh-keeping effect.
Upon determining that the refrigerator 10 does not need to start the defrosting mode, the refrigerating system 300 and the air supply fan 500 are operated in a normal refrigerating mode, i.e., are started or stopped at a normal refrigerating time.
Fig. 3 is a control flowchart of the refrigerator 10 according to one embodiment of the present invention. The process comprises the following steps:
in step S302, a start signal of the refrigeration system 300 of the refrigerator 10 is acquired.
Step S304, determining whether the triggering condition for starting the refrigeration system 300 is temperature rise due to door opening and closing actions, if yes, executing step S306, and if no, executing step S322.
In step S306, a temperature variation value caused by the door opening and closing operation is obtained. The temperature of the storage chamber of the refrigerator 10, which is obtained by last detection before the door of the refrigerator 10 is opened, is recorded as a first temperature, the temperature of the storage chamber, which is obtained by detection after the door of the refrigerator 10 is closed for a first set time, is recorded as a second temperature, and the difference value between the second temperature and the first temperature is calculated to obtain a temperature variation value.
And step S308, determining a cooling rate threshold according to the temperature variation value. The temperature reduction rate threshold value corresponds to a preset temperature variation range, and the step of determining the temperature reduction rate threshold value according to the temperature variation value comprises the following steps: determining the temperature variation range to which the temperature variation value belongs; and determining a cooling rate threshold according to the temperature variation range. The cool down rate threshold includes: the first rate reference is used as a first cooling rate judgment basis, and the second rate reference is used as a second cooling rate judgment basis.
In step S310, the cooling rate in the refrigerator 10 is acquired. The step of obtaining the cooling rate in the refrigerator 10 includes: obtaining a cooling rate after a second set time after the refrigeration system 300 is started, and recording the cooling rate as a first cooling rate; obtaining a cooling rate after a third set time after the refrigeration system 300 is started, and recording the cooling rate as a second cooling rate; wherein the third setting time is greater than the second setting time.
Step S312, determining whether the cooling rate exceeds the cooling rate threshold, if yes, performing step S314, and if no, performing step S320. The step of judging whether the cooling rate exceeds the cooling rate threshold value comprises the following steps: and judging whether the first cooling rate exceeds a first rate reference or not and whether the second cooling rate exceeds a second rate reference or not.
In step S314, it is determined that the refrigerator 10 needs to start the defrosting mode.
In step S316, the air supply fan 500 of the refrigerator 10 is driven to operate at the preset maximum rotation speed for a preset cooling time.
In step S318, after the refrigeration system 300 and the air supply fan 500 operate for a preset refrigeration time, the refrigerator 10 is driven to enter the defrosting mode. The operation time of the refrigeration system 300 and the air supply fan 500 is up to the preset refrigeration time and then the system is shut down.
In step S320, it is determined that the refrigerator 10 does not need to start the defrosting mode. That is, the refrigeration system 300 and the supply fan 500 are driven to operate in the normal refrigeration mode.
In step S322, the external ambient temperature of the refrigerator 10 is acquired.
In step S324, a temperature difference change rate threshold is determined according to the external environment temperature. The temperature difference change rate threshold corresponds to a preset external environment temperature range, and the step of determining the temperature difference change rate threshold according to the external environment temperature comprises the steps of determining the external environment temperature range to which the external environment temperature belongs, and determining the temperature difference change rate threshold according to the external environment temperature range.
In step S326, a temperature difference change rate between the storage compartment temperature of the refrigerator 10 and the evaporator temperature of the refrigerator 10 is obtained. The step of acquiring a temperature difference change rate between the storage compartment temperature of the refrigerator 10 and the evaporator temperature of the refrigerator 10 includes: and obtaining the temperature of the storage chamber and the temperature of the evaporator, and calculating the change rate of the difference value between the temperature of the storage chamber and the temperature of the evaporator in the fourth set time to obtain the temperature difference change rate.
In step S328, it is determined whether the temperature difference change rate exceeds the temperature difference change rate threshold, if yes, step S314 is executed, and if not, step S320 is executed. The temperature difference change rate exceeding the temperature difference change rate threshold value means that the temperature difference change rate is not within the numerical range defined by the corresponding temperature difference change rate threshold value.
By using the method of the embodiment, when the triggering condition for starting the refrigeration system 300 is that the door opening and closing action causes temperature rise in the storage compartment of the refrigerator 10, the cooling rate threshold is determined according to the temperature variation value caused by the door opening and closing action, and when the cooling rate of the storage compartment exceeds the cooling rate threshold, it is determined that the refrigerator 10 needs to start the defrosting mode. The evaporator frost layer thickness of the refrigerator 10 directly influences the refrigeration efficiency, and the invention judges whether the refrigerator 10 needs defrosting by utilizing the cooling rate from the actual frosting condition of the refrigerator 10, and can accurately determine whether the refrigerator 10 needs to start the defrosting mode, thereby realizing defrosting according to needs, and reducing or avoiding the problems of poor refrigeration effect and high energy consumption caused by untimely defrosting and too frequent defrosting.
Thus, it should be appreciated by those skilled in the art that while various exemplary embodiments of the invention have been shown and described in detail herein, many other variations or modifications which are consistent with the principles of this invention may be determined or derived directly from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (9)
1. A control method of a refrigerator, comprising:
acquiring a starting signal of a refrigerating system of the refrigerator;
judging whether the triggering condition for starting the refrigeration system is temperature rise caused by door opening and closing actions;
if so, acquiring a temperature variation value caused by the door opening and closing action, and determining a cooling rate threshold according to the temperature variation value;
acquiring a cooling rate in the refrigerator;
judging whether the cooling rate exceeds the cooling rate threshold value;
if yes, determining that the refrigerator needs to start a defrosting mode;
if the triggering condition for starting the refrigeration system is not temperature rise caused by door opening and closing actions, acquiring the external environment temperature of the refrigerator;
determining a temperature difference change rate threshold according to the external environment temperature;
acquiring the temperature difference change rate between the temperature of a storage compartment of the refrigerator and the temperature of an evaporator of the refrigerator;
judging whether the temperature difference change rate exceeds the temperature difference change rate threshold value or not;
and if so, determining that the refrigerator needs to start a defrosting mode.
2. The control method according to claim 1, wherein the step of acquiring the temperature variation value caused by the door opening and closing action comprises:
acquiring the temperature of a storage chamber of the refrigerator, which is obtained by the last detection before the refrigerator is opened, and recording as a first temperature;
acquiring the temperature of the storage chamber detected after the refrigerator is closed for a first set time, and recording the temperature as a second temperature;
and calculating the difference value between the second temperature and the first temperature to obtain the temperature variation value.
3. The control method according to claim 1, wherein the step of acquiring the cooling rate in the refrigerator includes:
obtaining a cooling rate after a second set time after the refrigeration system is started, and recording the cooling rate as a first cooling rate;
obtaining a cooling rate after a third set time after the refrigeration system is started, and recording the cooling rate as a second cooling rate; wherein
The third set time is greater than the second set time.
4. The control method of claim 3, wherein the cool down rate threshold comprises: a first rate reference which is used as a basis for judging the first cooling rate, and a second rate reference which is used as a basis for judging the second cooling rate;
the step of judging whether the cooling rate exceeds the cooling rate threshold value comprises the following steps:
judging whether the first cooling rate exceeds the first rate reference and whether the second cooling rate exceeds the second rate reference;
and if so, determining that the cooling rate exceeds the cooling rate threshold.
5. The control method according to claim 1, wherein
The temperature reduction rate threshold corresponds to a preset temperature variation range, and the step of determining the temperature reduction rate threshold according to the temperature variation value comprises the following steps:
determining the temperature variation range to which the temperature variation value belongs;
and determining the cooling rate threshold according to the temperature variation range.
6. The control method of claim 1, wherein the step of acquiring a rate of change in a temperature difference between a storage compartment temperature of the refrigerator and an evaporator temperature of the refrigerator comprises:
acquiring the temperature of the storage room and the temperature of the evaporator;
and calculating the change rate of the difference value between the temperature of the storage compartment and the temperature of the evaporator within a fourth set time to obtain the temperature difference change rate.
7. The control method according to claim 1, wherein
The temperature difference change rate threshold corresponds to a preset external environment temperature range, and the step of determining the temperature difference change rate threshold according to the external environment temperature comprises the following steps:
determining an external environment temperature range to which the external environment temperature belongs;
and determining the temperature difference change rate threshold according to the external environment temperature range.
8. The control method of claim 1, further comprising, after the step of determining that the refrigerator requires activation of a defrost mode:
driving an air supply fan of the refrigerator to operate at a preset highest rotating speed;
and after the refrigerating system and the air supply fan operate for a preset refrigerating time, driving the refrigerator to enter a defrosting mode.
9. A refrigerator, comprising:
a box body, wherein a storage chamber is formed inside the box body;
a control device, comprising: a processor and a memory, the memory having stored therein a control program for implementing the control method according to any one of claims 1-8 when executed by the processor.
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| US20070227166A1 (en) * | 2003-12-22 | 2007-10-04 | General Electric Company | Methods and apparatus for controlling refrigerators |
| CN101598483A (en) * | 2008-12-05 | 2009-12-09 | 海信科龙电器股份有限公司 | A kind of defroster control system and refrigerator defrost control method thereof |
| CN106679325A (en) * | 2017-01-09 | 2017-05-17 | 海信（山东）冰箱有限公司 | Method and device for icing protection for evaporator of refrigerator, and refrigerator |
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| US20070227166A1 (en) * | 2003-12-22 | 2007-10-04 | General Electric Company | Methods and apparatus for controlling refrigerators |
| CN101598483A (en) * | 2008-12-05 | 2009-12-09 | 海信科龙电器股份有限公司 | A kind of defroster control system and refrigerator defrost control method thereof |
| CN106679325A (en) * | 2017-01-09 | 2017-05-17 | 海信（山东）冰箱有限公司 | Method and device for icing protection for evaporator of refrigerator, and refrigerator |
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