CN110986466A - Self-adaptive defrosting control method - Google Patents
Self-adaptive defrosting control method Download PDFInfo
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- CN110986466A CN110986466A CN201911295450.7A CN201911295450A CN110986466A CN 110986466 A CN110986466 A CN 110986466A CN 201911295450 A CN201911295450 A CN 201911295450A CN 110986466 A CN110986466 A CN 110986466A
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- defrosting
- delta
- temperature change
- refrigerator
- defrosting control
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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
- F25D21/008—Defroster control by timer
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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
- F25D21/06—Removing frost
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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
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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
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/12—Sensors measuring the inside temperature
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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)
Abstract
The invention discloses a self-adaptive defrosting control method, and relates to the technical field of refrigerator defrosting. The method comprises the steps that the temperature of a controlled compartment is detected at the A, A +1 th refrigeration cycle when a refrigeration system works stably, the temperature change value is calculated by detecting the temperature of the controlled compartment at intervals of delta t, then the temperature change values of the two refrigeration cycles are averaged, the upper limit value and the lower limit value of the temperature change value are set according to the average value, the frosting thickness on an evaporator is predicted, and the frosting thickness is used as a judgment condition for entering a defrosting cycle to carry out defrosting control on the air-cooled refrigerator. The invention predicts the heat exchange capacity and the frosting degree of the evaporator by detecting the temperature descending trend of the controlled chamber when the refrigeration system works stably, thereby correcting the defrosting interval time, and carrying out defrosting control on the air-cooled refrigerator according to the corrected defrosting interval time.
Description
Technical Field
The invention belongs to the technical field of refrigerator defrosting, and particularly relates to a self-adaptive defrosting control method.
Background
The heat exchange capacity of the evaporator is affected by frost formation on the evaporator, and the conventional defrosting control generally controls the heater to defrost according to a method for setting specific time, for example, the heater is started to defrost according to the accumulated running time of a compressor or the door opening time reaching a preset value. Such defrosting control does not perform defrosting in accordance with the actual frosting situation. According to different use environments of the refrigerator, under the condition that the accumulated running time of the compressor or the door opening time is the same, the frosting degree on the evaporator is different, the conventional defrosting method cannot be used for defrosting in time when frosting is serious, and meanwhile, defrosting is started when defrosting is not needed, so that electric energy is wasted.
In order to solve the defect that the defrosting period cannot be adjusted according to the actual use condition of the refrigerator in the existing defrosting technology of the refrigerator, the invention provides a self-adaptive defrosting control method. The heat exchange capacity and the frosting degree of the evaporator are predicted by detecting the temperature descending trend of a controlled compartment during the stable work of the refrigerating system, so that the defrosting interval time is corrected, the air-cooled refrigerator is subjected to defrosting control according to the corrected defrosting interval time, the duration of the next defrosting interval period can be adaptively adjusted, the defrosting frequency is adapted to the actual use condition of the refrigerator, and the purposes of energy conservation and consumption reduction are achieved.
Disclosure of Invention
The invention aims to provide a self-adaptive defrosting control method, which predicts the heat exchange capacity and the frosting degree of an evaporator by detecting the temperature falling trend of a controlled compartment when a refrigerating system works stably, so as to correct the defrosting interval time, and controls the defrosting of an air-cooled refrigerator according to the corrected defrosting interval time.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a self-adaptive defrosting control method, which comprises the following steps: the method comprises the following steps: detecting the temperature of the controlled compartment of the refrigerator 3 times at intervals of delta t in 2 continuous refrigeration cycles from the A-th refrigeration cycle after the last defrosting is finished, and recording the temperature as TA1, TA2, TA3, TB1, TB2 and TB 3; that is, in A, A +1 th refrigerating cycle after the last defrosting is finished, the temperature of the controlled compartment of the refrigerator is detected 3 times at intervals of delta t and recorded as TA1, TA2, TA3, TB1, TB2 and TB3 respectively;
generally, when the frosting thickness of a refrigerator in several refrigeration cycles after defrosting is relatively low, and the temperature fluctuation of the compartment is large and the system is not stable due to the influence of the defrosting process in the initial refrigeration cycle; therefore, the defrosting detection is arranged at the A, A +1 th refrigerating cycle; the defrosting detection is started in the refrigeration cycle after the refrigerator is defrosted according to the humidity, the temperature, the system load and other factors in the environment where the refrigerator is located, so the defrosting detection is set in the refrigeration cycles 3 and 4 in the optimal period;
step two: calculating a controlled room temperature change value delta TA 1-TA 1 and a controlled room temperature change value delta TA2-TA 2 of the A-th refrigerating cycle and a controlled room temperature change value delta TB 1-TB 2-TB1 and a controlled room temperature change value delta TB2-TB 3-TB2 of the A + 1-th refrigerating cycle;
step three: the average values of Δ TA1 and Δ TB1, Δ TA2 and Δ TB2 are Δ T1 ═ Δ TA1+ Δ TB1)/2 and Δ T2 ═ Δ TA2+ Δ TB2)/2 respectively;
step four: detecting the temperature of the controlled compartment of the refrigerator for 3 times at intervals of delta t from the A +2 th refrigeration cycle, and recording as Tn1, Tn2 and Tn 3;
step five: calculating Δ Tn1 ═ Tn2-Tn1, Δ Tn2 ═ Tn3-Tn2, Δ T1up ═ k1 ═ Δ T1, Δ T2up ═ k1 ═ Δ T2, Δ T1low ═ k2 ═ Δ T1, and Δ T2low ═ k2 ═ Δ T2;
the variation values of Δ TA1, Δ TA2, Δ TB1, Δ TB2, Δ Tn1 and Δ Tn2 of the temperature variation value of the controlled compartment at this time can explain the relative magnitude of the cooling capacity generated by the refrigerator in the interval time Δ t to a certain extent;
step six: comparing the magnitude of Δ Tn1 with a first preset value Δ T1 up; if Δ Tn 1> Δ T1up and Δ Tn 2> Δ T2up, perform step nine; otherwise, executing step seven;
step seven: comparing the magnitude of the Δ Tn1 with a second preset value Δ T1 low; if the delta Tn1 is less than the delta T1low and the delta Tn2 is less than the delta T2low, executing the step four, otherwise, executing the step eight;
step eight: adding 1 to the accumulated frequency f, and then comparing the accumulated frequency f with a preset frequency N; if f is larger than or equal to N, executing the ninth step; otherwise, executing the step four;
step nine: the compressor is closed, the heater is opened, and defrosting is started.
Further, the value range of a is as follows: a is more than or equal to 2; wherein the optimal value is A-3; the value of A can be set to adjust the size of A.
Further, the k1, k2 are constants, and 1> k2> k1> 0.
Further, when defrosting is finished, clearing the data of the accumulated times f, and re-entering the step one.
The invention has the following beneficial effects:
according to the invention, the temperature of a controlled compartment is detected at intervals of delta t through the 3 rd and 4 th refrigeration cycles of the refrigerator during the stable work of a refrigeration system, the temperature change value is calculated, then the temperature change values of the two refrigeration cycles are averaged, the upper limit value and the lower limit value of the temperature change value are set according to the average value, the frosting thickness on an evaporator is predicted and used as a judgment condition for entering a defrosting cycle, and the defrosting control is carried out on the air-cooled refrigerator; the method has the advantages that the heat exchange capacity and the frosting degree of the evaporator are predicted, so that the defrosting interval time is corrected, the defrosting control is performed on the air-cooled refrigerator according to the corrected defrosting interval time, the defrosting frequency is adapted to the actual use condition of the refrigerator, and the energy saving and consumption reduction are achieved.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of an adaptive defrosting control method according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a method for controlling adaptive defrosting, including: the method comprises the following steps: detecting the temperature of the controlled compartment of the refrigerator 3 times at intervals of time delta T in 2 continuous refrigeration cycles from the 3 rd refrigeration cycle after the last defrosting is finished, and respectively recording the temperature as T31, T32, T33, T41, T42 and T43; that is, in the 3 rd and 4 th refrigeration cycles after the last defrosting is finished, the temperature of the controlled compartment of the refrigerator is detected 3 times at intervals of time delta T and recorded as T31, T32, T33, T41, T42 and T43;
generally, when the frosting thickness of a refrigerator in several refrigeration cycles after defrosting is relatively low, and the temperature fluctuation of the compartment is large and the system is not stable due to the influence of the defrosting process in the initial refrigeration cycle; therefore, the defrosting detection is arranged at the A, A +1 th refrigerating cycle; the defrosting detection is started in the refrigeration cycle after the refrigerator is defrosted according to the humidity, the temperature, the system load and other factors in the environment where the refrigerator is located, so the defrosting detection is set in the refrigeration cycles 3 and 4 in the optimal period;
step two: calculating a controlled room temperature change value delta T31-T31 and a controlled room temperature change value delta T32-T32 of the 3 rd refrigerating cycle and a controlled room temperature change value delta T41-T42-T41 and a controlled room temperature change value delta T42-T43-T42 of the 4 th refrigerating cycle;
the magnitude of the change values of the temperature change values of the controlled room at this time, namely Δ T31, Δ T32, Δ T41 and Δ T42, can indicate the relative magnitude of the refrigerating capacity generated by the refrigerator in the interval time Δ T;
step three: averaging values of Δ T31 and Δ T41, Δ T32 and Δ T42 to obtain Δ T1 ═ Δ T31+ Δ T41)/2 and Δ T2 ═ Δ T32+ Δ T42)/2 respectively;
step four: detecting the temperature of the controlled compartment of the refrigerator 3 times at intervals of delta t from the 5 th refrigeration cycle, and recording as Tn1, Tn2 and Tn 3;
step five: calculating the values of delta Tn1, Tn2-Tn1 and delta Tn2, Tn3-Tn 2;
step six: comparing the magnitude of Δ Tn1 with a first preset value Δ T1 up; if Δ Tn 1> Δ T1up and Δ Tn 2> Δ T2up, perform step nine; otherwise, executing step seven;
step seven: comparing the magnitude of the Δ Tn1 with a second preset value Δ T1 low; if the delta Tn1 is less than the delta T1low and the delta Tn2 is less than the delta T2low, executing the step four, otherwise, executing the step eight;
step eight: adding 1 to the accumulated frequency f, and then comparing the accumulated frequency f with the preset frequency N; if f is larger than or equal to N, executing the ninth step; otherwise, executing the step four;
step nine: the compressor is closed, the heater is opened, and defrosting is started.
Preferably, in step five, Δ T1up ═ k1 × Δ T1, Δ T2up ═ k1 × Δ T2; in step six, Δ T1low ═ k2 × Δ T1 and Δ T2low ═ k2 × Δ T2.
Preferably, k1, k2 are constants, and 1> k2> k1> 0.
Preferably, when defrosting is finished, clearing the data of the accumulated times f, and re-entering the step one.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. An adaptive defrosting control method is characterized in that: the method comprises the following steps:
the method comprises the following steps: detecting the temperature of the controlled compartment of the refrigerator 3 times at intervals of delta t in 2 continuous refrigeration cycles from the A-th refrigeration cycle after the last defrosting is finished, and recording the temperature as TA1, TA2, TA3, TB1, TB2 and TB 3;
step two: calculating a controlled room temperature change value delta TA 1-TA 1 and a controlled room temperature change value delta TA2-TA 2 of the A-th refrigerating cycle and a controlled room temperature change value delta TB 1-TB 2-TB1 and a controlled room temperature change value delta TB2-TB 3-TB2 of the A + 1-th refrigerating cycle;
step three: the average values of Δ TA1 and Δ TB1, Δ TA2 and Δ TB2 are Δ T1 ═ Δ TA1+ Δ TB1)/2 and Δ T2 ═ Δ TA2+ Δ TB2)/2 respectively;
step four: detecting the temperature of the controlled compartment of the refrigerator for 3 times at intervals of delta t from the A +2 th refrigeration cycle, and recording as Tn1, Tn2 and Tn 3;
step five: calculating Δ Tn1 ═ Tn2-Tn1, Δ Tn2 ═ Tn3-Tn2, Δ T1up ═ k1 ═ Δ T1, Δ T2up ═ k1 ═ Δ T2, Δ T1low ═ k2 ═ Δ T1, and Δ T2low ═ k2 ═ Δ T2;
step six: comparing the magnitude of Δ Tn1 with a first preset value Δ T1 up; if Δ Tn 1> Δ T1up and Δ Tn 2> Δ T2up, perform step nine; otherwise, executing step seven;
step seven: comparing the magnitude of the Δ Tn1 with a second preset value Δ T1 low; if the delta Tn1 is less than the delta T1low and the delta Tn2 is less than the delta T2low, executing the step four, otherwise, executing the step eight;
step eight: adding 1 to the accumulated frequency f, and then comparing the accumulated frequency f with a preset frequency N; if f is larger than or equal to N, executing the ninth step; otherwise, executing the step four;
step nine: the compressor is closed, the heater is opened, and defrosting is started.
2. The adaptive defrosting control method according to claim 1, wherein the value range of a is as follows: a is more than or equal to 2.
3. The adaptive defrosting control method according to claim 1, wherein the k1 and k2 are constants, and 1> k2> k1> 0.
4. The adaptive defrosting control method according to claim 1, 2 or 3, wherein when defrosting is finished, the data of the accumulated times f are cleared, and the step one is re-entered.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113739460A (en) * | 2021-08-26 | 2021-12-03 | 珠海格力电器股份有限公司 | Evaporator defrosting treatment method and device and heat pump equipment |
| CN113834281A (en) * | 2021-09-24 | 2021-12-24 | 珠海格力电器股份有限公司 | Defrosting control method and device and refrigerator |
| CN113865256A (en) * | 2021-10-09 | 2021-12-31 | 珠海格力电器股份有限公司 | Defrosting control method and device, electronic equipment and refrigeration equipment |
| CN114279110A (en) * | 2022-03-01 | 2022-04-05 | 浙江乾丰智能科技有限公司 | Intelligent defrosting device and method for air energy water heater |
| CN115265040A (en) * | 2022-07-26 | 2022-11-01 | 澳柯玛股份有限公司 | Double-bridge parallel evaporator air cooling system and control method thereof |
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| CN115265040A (en) * | 2022-07-26 | 2022-11-01 | 澳柯玛股份有限公司 | Double-bridge parallel evaporator air cooling system and control method thereof |
| CN115265040B (en) * | 2022-07-26 | 2023-09-05 | 澳柯玛股份有限公司 | Double-bridge parallel evaporator air cooling system and control method thereof |
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