CN113915921B - Defrosting control method and refrigerator - Google Patents
Defrosting control method and refrigerator Download PDFInfo
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- CN113915921B CN113915921B CN202110089482.2A CN202110089482A CN113915921B CN 113915921 B CN113915921 B CN 113915921B CN 202110089482 A CN202110089482 A CN 202110089482A CN 113915921 B CN113915921 B CN 113915921B
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- 238000010257 thawing Methods 0.000 title claims abstract description 283
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims description 22
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000004913 activation Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
- F25D21/08—Removing frost by electric heating
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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
- F25D29/005—Mounting of control 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
- 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
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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
- F25D2700/10—Sensors measuring the temperature of the evaporator
Abstract
The invention provides a defrosting control method, which comprises the following steps: s1: determining that a set defrosting triggering condition is met; s2: the defrosting heater works and judges whether defrosting exit temperature is excessive or not; if yes, executing step S3; if not, keeping defrosting exit conditions unchanged; s3: regulating defrosting exit conditions, and defrosting according to the regulated defrosting exit conditions when next defrosting is performed; the defrosting control method can dynamically adjust the defrosting exit condition, so that the defrosting exit temperature threshold is adjusted under the condition of excessive defrosting temperature, the next defrosting is defrosted under the more reasonable defrosting exit condition, and the condition of residual defrosting temperature is improved; the defrosting control method not only ensures the defrosting effect, but also avoids the increase of power consumption caused by excessive defrosting temperature, and effectively shortens the defrosting time.
Description
Technical Field
The invention belongs to the technical field of defrosting treatment, and particularly relates to a defrosting control method and a refrigerator.
Background
At present, frost formation of the air-cooled refrigerator is concentrated on an evaporator, and a defrosting heater needs to be started to defrost the evaporator after the air-cooled refrigerator runs for a period of time. The control conditions for defrosting exiting of the air-cooled refrigerator are generally set as follows: when the temperature of the temperature sensing head on the evaporator reaches the set defrosting exit temperature, the defrosting control is exited after the ice on the evaporator is considered to be completely melted. In general, the defrosting exit temperature is a temperature value which can ensure that defrosting is clean under the condition that the icing of the evaporator is serious; the defrosting exit temperature set above will cause excessive defrosting and the temperature in the tank will rise too high, and the defrosting heating wire will increase power consumption.
The invention is provided in view of the above.
Disclosure of Invention
The invention provides a defrosting control method aiming at the technical problems.
In order to achieve the purpose, the invention adopts the technical scheme that:
a defrosting control method comprising the steps of:
s1: determining that a set defrosting triggering condition is met;
s2: the defrosting heater works and judges whether defrosting exit temperature is excessive or not; if yes, executing step S3; if not, keeping defrosting exit conditions unchanged;
s3: and regulating defrosting exit conditions, and defrosting according to the regulated defrosting exit conditions when next defrosting is performed.
Preferably, the step S2 of determining whether the defrosting exiting temperature is excessive specifically includes:
obtaining evaporator temperature T z Comparing the evaporator temperature T z And ith exit temperature threshold T ti The size of (d);
when T is z ≥T ti When the defrosting heater is started, the defrosting heater stops heating, and the timer stops timing; obtaining the total defrosting duration t si Maximum evaporator temperature T zimax (ii) a Wherein i represents the number of times of adjusting the defrosting exit condition after the equipment is powered on, and the initial value of i is 0;
then calculating the highest temperature T of the evaporator zimax And ith exit temperature threshold T ti Difference value T of zimax -T ti And comparing the difference T zimax -T ti Threshold value delta T of temperature difference 0 Total defrosting duration time t si And defrosting time length threshold t 0 When the size of (1) is T zimax -T ti ＞△T 0 And t is si ＜t 0 If the defrosting withdrawal temperature is excessive, the defrosting withdrawal temperature is judged to be excessive.
Preferably, a plurality of temperature values within a set time period from the start of heating of the defrosting heater to the stop of heating of the defrosting heater are collected, and the collected temperature values are compared to obtain the highest temperature T of the evaporator zimax 。
The defrosting control method according to claim 2 or 3, characterized in that: the defrosting exit temperature range is set to be M, N]Wherein N > M > 0 ℃; t is t0 ＝N。
Preferably,. DELTA.T 0 ∈[1，4]The unit: DEG C.
Preferably, when T is z ＜T ti Comparing the defrosting time t of the defrosting heater s And defrosting time length threshold t 0 The size of (d);
when t is s ＜t 0 When the defrosting heater is started, the defrosting heater continues to heat;
when t is s ≥t 0 And when the defrosting heater stops heating, the timer is reset, and the set defrosting triggering condition is waited to be met again.
Preferably, the adjusting of the defrosting exit condition in step S3 specifically includes: the defrost exit temperature threshold is reduced.
Preferably, the adjusting of the defrosting exiting condition in step S3 specifically includes:
s31: i = i +1, i initial value is 0;
S32：T ti ＝N-i△T 1 ；
s33: comparing the ith exit temperature threshold T ti And a minimum temperature threshold value M, and judging whether T is present ti ＞M？
If yes, waiting for meeting the set defrosting triggering condition again;
if not, taking the minimum exit temperature threshold value M as a defrosting exit condition in the subsequent defrosting process.
Preferably,. DELTA.T 1 ∈[0.2，0.6]The unit is: DEG C.
The refrigerator is used for realizing the defrosting control method.
Compared with the prior art, the invention has the advantages and positive effects that:
the invention provides a defrosting control method, which comprises the following steps: s1: determining that a set defrosting triggering condition is met; s2: the defrosting heater works and judges whether defrosting exit temperature is excessive or not; if yes, executing step S3; if not, keeping the defrosting exit condition unchanged; s3: regulating defrosting exit conditions, and defrosting according to the regulated defrosting exit conditions when next defrosting is performed; the defrosting control method can dynamically adjust the defrosting exit condition so as to adjust the defrosting exit temperature threshold value under the condition of excessive defrosting temperature, so that the next defrosting is performed under the more reasonable defrosting exit condition, and the condition of residual defrosting temperature is improved; the defrosting control method not only ensures the defrosting effect, but also avoids the increase of power consumption caused by excessive defrosting temperature and effectively shortens the defrosting time.
Drawings
FIG. 1 is a schematic view of a defrosting control system according to the present invention;
FIG. 2 is an overall flow chart of the defrosting control method according to the present invention;
FIG. 3 is a detailed flow chart of the defrosting control method according to the present invention.
In the above figures: a control system 100; a setting module 10; a counting module 20; a temperature acquisition module 30; a timing module 40; a judging module 50; a control module 60.
Detailed Description
The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the scope of the present invention as claimed is not limited to the scope described in the specific embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
It should be noted that the description relating to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
A refrigerator includes a cabinet defining an insulated storage compartment. The refrigerator is provided with a refrigerating system, and the refrigerating system comprises an evaporator for providing cold energy for the storage room, a fan for diffusing the cold energy generated by the evaporator to the corresponding storage room, and a defrosting heater for defrosting the evaporator. When the refrigerator needs defrosting, the defrosting heater works to defrost the evaporator.
As shown in fig. 1, the refrigerator is provided with a control system 100 for controlling the operation states of various components of the refrigerator to control the refrigerator. The control system 100 includes a setting module 10, a counting module 20, a temperature collecting module 30, a timing module 40, a determining module 50, and a control module 60.
The setting module 10 is configured to obtain various standard parameters of the refrigerator operation, where the standard parameters include, but are not limited to, a temperature parameter, a time parameter, and the like. In this embodiment, the setting module 10 obtains the ith exit temperature threshold T during the defrosting process ti Defrosting time threshold t 0 Temperature difference threshold value delta T 0 Corrected temperature DeltaT 1 A maximum exit temperature threshold N and a minimum exit temperature threshold M; wherein the maximum exit temperature threshold N is larger than the minimum exit temperature threshold M is larger than 0 ℃, and the defrosting exit temperature range is set to be [ M, N ] when the refrigerator is defrosted]. Ith exit temperature threshold T ti The ith represents the number of times of correcting defrosting exit conditions after the refrigerator is powered on, and the ith exit temperature threshold value T ti The defrosting exit temperature threshold value is the defrosting exit temperature threshold value after the defrosting exit condition is corrected for the ith time after the refrigerator is powered on; wherein the initial value of i is 0 and T ti ∈[M，N]。T t0 The defrosting exit temperature is the first defrosting exit temperature after the refrigerator is powered on, and is the unmodified defrosting exit temperature. In this example, T t0 = N; namely, the defrosting exit temperature when the refrigerator is powered on for the first defrosting is the maximum exit temperature threshold value N. In the embodiment, a defrosting exit temperature threshold and a defrosting duration threshold are set as exit conditions for the defrosting heater to exit heating; the defrosting heater is used for heating the defrosting heater to be heated, wherein the defrosting exit temperature threshold is used as a first judgment condition for judging the exit of the defrosting heater; and under normal condition, when defrosting is carried out, the defrosting heater works to the temperature threshold T when secondary defrosting exits ti The time length required for stopping heating is less than the set defrosting time length threshold t 0 (ii) a Defrosting time threshold t 0 As a second determination condition after the defrosting exit temperature, it is possible to defrost an abnormality (e.g., evaporator temperature sensor damage) in the refrigeratorAnd if the temperature of the evaporator is always higher than the defrosting exit temperature), the obtained evaporator temperature is used as a defrosting exit condition to control the defrosting heater to stop working, so that the defrosting heater is prevented from being always in a heating state when defrosting is abnormal. The setting module 10 also sets a defrosting triggering condition.
The temperature acquisition module 30 is used for acquiring the temperature T of the evaporator in real time Z . Specifically, the temperature collecting module 30 includes an evaporator sensor disposed on the evaporator, and the evaporator sensor is used for sensing and obtaining the evaporator temperature T Z . It should be understood that, in other embodiments, the evaporator sensors are provided in plurality, and the temperature acquisition module 30 further includes a data processing unit, wherein the data processing unit is configured to receive the temperature values of the evaporator sensed by the evaporator sensors respectively and process the temperature values according to a preset logic to obtain the evaporator temperature T z 。
The timing module 40 is used for recording time, and may be specifically configured as a timer. The timing module 40 in the embodiment is used for recording the defrosting time length t for defrosting the evaporator when the defrosting heater is continuously operated in the defrosting process s And total defrosting duration t si . Wherein the defrosting time is t s The current count of the timer when the timer data is collected; and the total defrosting duration t si The total time from the start of the heater to the stop of the heater is defrosted.
The judging module 50 is used for receiving the evaporator temperature T collected by the temperature collecting module 30 z (ii) a The judgment module 50 judges the maximum temperature T reached by the evaporator when defrosting is performed again zimax ，T zimax Recording as the evaporator maximum temperature; on the other hand, the judgment module 50 is used for calculating the highest evaporator temperature T zimax And a current exit temperature threshold T ti Difference value T of zimax -T ti And determining T zimax -T ti Threshold value delta T of temperature difference with preset value 0 The magnitude relationship of (a). In addition, the judgment module 50 judges the evaporator temperature T in the defrosting process z And ith exit temperature threshold T ti The magnitude relationship of (a). In addition, the judging module 50 is configured to receive the defrosting time t collected by the timing module 40 s And defrosting persistenceTotal time length t si And judging the defrosting time t s Total defrosting duration t si Respectively associated with a defrosting time threshold t 0 The magnitude relationship of (a); furthermore, the determining module 50 is configured to determine a magnitude relationship between the ith temperature threshold and the minimum exit temperature threshold M after the defrosting exit condition is adjusted.
The counting module 20 is used for recording the number of times of the logic processing, and can be specifically set as a counter. In this embodiment, the counting module 20 is configured to record the number of times that the defrosting exit condition (defrosting exit temperature threshold) is corrected after the refrigerator is powered on, where an initial value of i is 0, and when i =0, it indicates an initial state of first defrosting after the refrigerator is powered on.
The control module 60 is connected to the setting module 10, the counting module 20, the temperature collecting module 30, the timing module 40 and the judging module 50, performs information interaction with the setting module 10, the counting module 20, the temperature collecting module 30, the timing module 40 and the judging module 50, and controls the operation and stop states of a refrigerating system, a fan and a defrosting heater of the refrigerator.
Specifically, a defrosting method for a refrigerator, as shown in fig. 2 to 3, includes determining that a set defrosting trigger condition is met after a device is powered on; the defrosting heater works and judges whether the defrosting exit temperature is excessive or not; when the defrosting exit temperature is excessive, adjusting the defrosting exit condition, and defrosting according to the adjusted defrosting exit condition when defrosting next time; if the defrosting withdrawal temperature is not excessive, the defrosting withdrawal condition is kept unchanged.
As shown in fig. 3, the specific steps are as follows:
s1: powering on equipment, and determining that a set defrosting triggering condition is met;
which comprises the following steps:
s11: powering on the equipment;
the equipment is powered on as a trigger condition for starting the defrosting control method, and the defrosting control method is triggered to be carried out again each time the equipment is powered on.
S12: determining that a set defrosting triggering condition is met;
the set defrosting triggering condition can be that the accumulated running time of the evaporator reaches a preset threshold value; the set defrosting activation condition is not particularly limited, and may be set to an existing defrosting activation condition or may be set as needed. When the refrigerator runs to meet the set defrosting triggering condition, the refrigerator enters a defrosting mode, and the defrosting heater works to defrost the evaporator.
After the step S1 determines that the set defrosting trigger condition is met, the step S2 is executed to start the defrosting mode.
S2: the defrosting heater works and judges whether the defrosting exit temperature is excessive or not;
which comprises the following steps:
s21: heating by a defrosting heater, and timing by a timer;
s22: obtaining evaporator temperature T z ；
S23: comparing the evaporator temperature T z And ith exit temperature threshold T ti Is judged whether T is satisfied z ＜T ti Is it a question of If yes, go to step S26; if not, executing step S24; wherein the initial value of i is 0;
s24: stopping heating by the defrosting heater, and stopping timing by the timer; obtaining the total defrosting duration t si Maximum temperature of evaporator T zimax (ii) a Then resetting the timer;
at evaporator temperature T z Increasing to be greater than or equal to the ith exit temperature threshold T of the current defrosting exit condition ti When the defrosting heater is started, the defrosting heater stops heating, and the timer stops timing;
acquiring the total defrosting duration t according to the timing of the timer si (ii) a And then the timer is cleared to be ready for timing again when defrosting is carried out next time.
Comparing the relative sizes of the evaporator temperature in the heating process of the defrosting heater according to the recorded evaporator temperature, and acquiring the highest evaporator temperature T zimax (ii) a Generally, the highest evaporator temperature T is reached when defrosting zimax When the defrosting heater stops heating or within a period of time after the defrosting heater stops heating; wherein the maximum evaporator temperature T zimax Occurs in a period of time after the defrosting heater stops heatingWhile it is still in a defrosting cycle; so for the highest temperature T of the evaporator zimax The temperature acquisition module 30 acquires a plurality of temperature values within a certain time period (the time period can be preset according to experience) from the start of heating by the defrosting heater to the stop of heating by the defrosting heater, and the temperature values are obtained by comparison by the judgment module 50.
S25: calculating the maximum temperature T of the evaporator zimax And ith exit temperature threshold T ti Difference value T of zimax -T ti Determine whether T is satisfied zimax -T ti ＞△T 0 And t is si ＜t 0 ？
If yes, executing step S3; if not, the defrosting exiting condition is kept unchanged, and the step S12 is returned to.
When the maximum temperature T of the evaporator is reached zimax And ith exit temperature threshold T ti Difference value T of zimax -T ti Greater than threshold value of temperature difference 0 And the total defrosting duration t si Is less than the defrosting time length threshold t 0 Indicates that the ith exit temperature threshold T was at this time ti Actual maximum temperature T of evaporator during defrosting for defrosting exit condition zimax Above the ith exit temperature threshold T ti Judging that the defrosting exiting temperature is excessive; although excessive defrosting temperature can cause the evaporator to defrost cleanly, it causes unnecessary overheating of the defrosting heater, which increases power consumption and causes the temperature in the storage room to rise too high. For this reason, when it is determined in step S25 that the defrosting exit temperature is excessive, step S3 is performed to adjust the defrosting exit condition so that defrosting is performed according to the defrosting exit condition adjusted in step S3 at the time of next defrosting; therefore, a dynamic adjusting process is formed, the defrosting can be fully performed, the defrosting time can be shortened, unnecessary waste is reduced, and the influence on the temperature of the storage room is reduced. In this embodiment, Δ T 0 ∈[1，4]The unit is: DEG C.
S26: comparing the defrosting time t of the defrosting heater s And a defrosting time length threshold t 0 Is judged whether t is satisfied s ＜t 0 Is there a If yes, go to step S22; if not, the defrosting heater stops heating,and resetting the timer to wait for meeting the set defrosting triggering condition again.
S3: adjusting the defrosting exit condition, and defrosting according to the adjusted defrosting exit condition when next defrosting is performed;
s31: i = i +1, i initial value 0;
S32：T ti ＝N-i△T 1 ；
when it is determined that the defrosting temperature is excessive through step S25, the defrosting temperature condition is adjusted so that defrosting is performed according to the adjusted defrosting exit condition at the next defrosting. In this embodiment, after the device is powered on, when the frost is first dissolved, the temperature threshold T for exiting the first defrosting is set t0 Set to the maximum exit temperature threshold N, i.e. T t0 ＝N；T t0 The defrosting exit temperature is not corrected. And taking the defrosting exit condition after each correction as the defrosting exit condition when next defrosting is carried out.
In step S32, when the defrosting exit condition is adjusted, the ith exit temperature threshold T is next set ti Temperature Δ T corrected by = maximum temperature threshold N-i · 1 (ii) a Wherein, delta T 1 Is greater than 0 ℃. i represents the number of times the defrosting exit condition is corrected after the refrigerator is powered on. Wherein, Δ T 1 Setting the sensitivity of an evaporator temperature sensor; specifically, in the present embodiment, Δ T 1 ∈[0.2，0.6]The unit is: c
S33: comparing the ith exit temperature threshold T ti And a minimum temperature threshold value M, and judging whether T is present ti Is > M? If yes, executing step S12; if the set defrosting triggering condition is satisfied again, the ith exit temperature threshold T obtained in step S32 is used ti The defrosting exit condition is adopted.
If not (not satisfying T) ti Less than or equal to M), taking the minimum exit temperature threshold value M as a defrosting exit condition in the subsequent defrosting process of the refrigerator. In step S33, the ith exit temperature threshold T is compared ti With a minimum temperature threshold M and at T ti When the temperature is less than or equal to M, taking the minimum exit temperature threshold value M as a defrosting exit condition to ensure that the exit temperature threshold value is in a set range [ N, M%]And excessive adjustment is avoided, so that the effectiveness of defrosting is ensured under the condition of dynamic adjustment.
When it is determined in step S2 that the defrosting temperature is excessive, the defrosting exit condition is adjusted in step S3 so that defrosting is performed under a more reasonable defrosting exit condition for the next defrosting, thereby improving the situation where the defrosting temperature remains.
The defrosting control method can dynamically adjust the defrosting exit condition so as to adjust the defrosting exit temperature threshold value under the condition of excessive defrosting temperature, so that the next defrosting is performed under the more reasonable defrosting exit condition, and the condition of residual defrosting temperature is improved; the defrosting control method not only ensures the defrosting effect, but also avoids the increase of power consumption caused by excessive defrosting temperature and effectively shortens the defrosting time.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.
Claims (8)
1. The defrosting control method is characterized by comprising the following steps: which comprises the following steps:
s1: determining that a set defrosting triggering condition is met;
s2: the defrosting heater works and judges whether defrosting exit temperature is excessive or not; if yes, executing step S3; if not, keeping the defrosting exit condition unchanged;
s3: adjusting the defrosting exit condition, and defrosting according to the adjusted defrosting exit condition when next defrosting is performed;
wherein, the step S2 of judging whether the defrosting exiting temperature is excessive specifically comprises:
obtaining evaporator temperature T z Comparing the evaporator temperature T z And ith exit temperature threshold T ti The size of (d);
when T is z ≥T ti For long time, to dissolve frost, addStopping heating the heater, and stopping timing by the timer; obtaining the total defrosting duration t si Maximum temperature of evaporator T zimax (ii) a Wherein i represents the number of times of adjusting the defrosting exit condition after the equipment is powered on, and the initial value of i is 0;
then calculating the highest evaporator temperature T zimax And ith exit temperature threshold T ti Difference value T of zimax -T ti And comparing the difference T zimax -T ti Threshold value delta T of temperature difference 0 Total defrosting duration t si And defrosting time length threshold t 0 When the size of (1) is T zimax -T ti ＞△T 0 And t is si ＜t 0 Judging that the defrosting exit temperature is excessive;
wherein, a plurality of temperature values within a set time period from the start of heating of the defrosting heater to the stop of heating of the defrosting heater are collected, and the collected temperature values are compared to obtain the highest temperature T of the evaporator zimax 。
2. The defrosting control method according to claim 1, characterized in that: the defrosting exit temperature range is set to be M, N]Wherein N > M > 0 ℃; t is t0 =N。
3. The defrosting control method according to claim 1, characterized in that: delta T 0 ∈[1，4]The unit: DEG C.
4. The defrosting control method according to claim 1, characterized in that: when T is z ＜T ti Comparing the defrosting time t of the defrosting heater s And defrosting time length threshold t 0 The size of (d);
when t is s ＜t 0 When the defrosting heater is started, the defrosting heater continues to heat;
when t is s ≥t 0 And when the defrosting heater stops heating, the timer is reset, and the set defrosting triggering condition is waited to be met again.
5. The defrosting control method according to claim 2, characterized in that: the step S3 of adjusting the defrosting exit condition specifically includes: the defrost exit temperature threshold is reduced.
6. The defrosting control method according to claim 5, characterized in that: the step S3 of adjusting the defrosting exit condition specifically includes:
s31: i = i +1, i initial value 0;
S32：T ti =N-i△T 1 ；
s33: comparing the ith exit temperature threshold T ti And the minimum temperature threshold value M, judging whether T is ti ＞M；
If yes, waiting for meeting the set defrosting triggering condition again;
if not, taking the minimum exit temperature threshold value M as a defrosting exit condition in the subsequent defrosting process.
7. The defrosting control method according to claim 6, characterized in that: delta T 1 ∈[0.2，0.6]The unit: DEG C.
8. The refrigerator is characterized in that: for implementing the defrosting control method according to any one of the preceding claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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