CN113883679A - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- CN113883679A CN113883679A CN202111130007.1A CN202111130007A CN113883679A CN 113883679 A CN113883679 A CN 113883679A CN 202111130007 A CN202111130007 A CN 202111130007A CN 113883679 A CN113883679 A CN 113883679A
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- 238000010257 thawing Methods 0.000 title claims abstract description 348
- 238000000034 method Methods 0.000 title claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/66—Sleep mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioner control, and particularly provides a defrosting control method for an air conditioner, aiming at solving the problem that the existing defrosting method for the air conditioner cannot accurately judge the defrosting time and therefore leads to incomplete defrosting or false defrosting. To this end, the inventive defrost control method for an air conditioner includes: acquiring preset defrosting time T1 of the air conditioner; acquiring an actual interval period T2 of the last defrosting of the air conditioner; acquiring the actual defrosting time T3 of the current defrosting of the air conditioner; calculating a difference T4 between T1 and T3; correcting the actual interval period T2 of the last defrosting of the air conditioner according to the difference T4 to determine the shortest interval period T5 of the next defrosting of the air conditioner; and when the defrosting condition is met and the time interval from the last defrosting is greater than or equal to the shortest interval period T5 of the next defrosting of the air conditioner, controlling the air conditioner to enter a defrosting mode. The method of the invention can dynamically adjust the time interval between two times of defrosting according to the actual working condition, and realize accurate defrosting.
Description
Technical Field
The invention belongs to the technical field of air conditioner control, and particularly provides a defrosting control method for an air conditioner.
Background
In the operation process of the air conditioner, the heat exchanger exchanges heat with air, in the low-environment-temperature heating process, particularly at about 0 ℃, when the evaporation temperature is lower than the dew point temperature in the air, the surface of the air conditioner evaporator frosts to different degrees, the frosting increases the heat transfer resistance of the heat exchanger, the airflow flowing resistance is increased, the heat exchange coefficient is reduced, and the performance of the heat exchanger is deteriorated.
The existing defrosting control method of the air conditioner generally segments the ambient temperature, carries out defrosting after comparing the ambient temperature with the temperature of a defrosting sensor, and sets a defrosting condition under each ambient temperature segment to realize segmented control. However, this method has problems that the defrosting condition is too loose, precise defrosting cannot be achieved, and thus defrosting is not clean or false defrosting is caused.
Accordingly, there is a need in the art for a new defrost control method for an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the existing defrosting control method for an air conditioner cannot accurately determine the defrosting time and thus causes incomplete defrosting or false defrosting, the present invention provides a defrosting control method for an air conditioner, the method comprising: acquiring preset defrosting time T1 of the air conditioner; acquiring an actual interval period T2 of the last defrosting of the air conditioner; acquiring the actual defrosting time T3 of the current defrosting of the air conditioner; calculating a difference T4 between the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the air conditioner for defrosting at this time; correcting the actual interval period T2 of the last defrosting of the air conditioner according to the difference T4 to determine the shortest interval period T5 of the next defrosting of the air conditioner; and when the defrosting condition is met and the time interval from the last defrosting is greater than or equal to the shortest interval period T5 of the next defrosting of the air conditioner, controlling the air conditioner to enter a defrosting mode.
In a preferred technical solution of the above defrosting control method for an air conditioner, the specific calculation manner of the difference T4 is as follows: t4 is the preset defrosting time T1-the actual defrosting time T3 of the air conditioner at this time; the shortest interval period T5 for the next defrosting of the air conditioner is determined by the following method: when T4>0, setting the shortest interval period T5 of the next defrosting of the air conditioner to be larger than the actual interval period T2 of the last defrosting of the air conditioner; and/or when T4 is equal to 0, setting the shortest interval period T5 of the next defrosting of the air conditioner to be equal to the actual interval period T2 of the last defrosting of the air conditioner; and/or, when T4<0, setting the shortest interval period T5 for the next defrosting of the air conditioner to be less than the actual interval period T2 for the last defrosting of the air conditioner.
In the above-described preferred embodiment of the defrosting control method for an air conditioner, when T4>0 or T4<0, the shortest interval period T5 for the next defrosting of the air conditioner is calculated by the following equation: t5 ═ T1/T3 ═ T2.
In a preferred embodiment of the above defrosting control method for an air conditioner, the defrosting condition of the air conditioner is that a detected value of the relevant parameter reaches a set threshold value.
In the above preferred technical solution of the defrosting control method for an air conditioner, the related parameter is one or more of an evaporator temperature, a fan rotation speed, a water inlet and outlet temperature difference, and a high pressure and a low pressure.
In a preferred embodiment of the above-mentioned defrosting control method for an air conditioner, the preset defrosting time T1 of the air conditioner includes a plurality of sets of different defrosting time periods set according to different frosting conditions.
In a preferred embodiment of the above-mentioned defrosting control method for an air conditioner, the defrosting control method further includes: judging whether a forced defrosting condition is met; and when the forced defrosting condition is met, controlling the air conditioner to enter a forced defrosting mode.
In a preferred embodiment of the above-mentioned defrosting control method for an air conditioner, the defrosting control method further includes: in case of entering the forced defrosting mode, the shortest interval period T5 for the next defrosting of the air conditioner is set to the defrosting shortest interval period minimum value Tmin.
In a preferred embodiment of the above defrosting control method for an air conditioner, the forced defrosting condition is that a detected value of the evaporator temperature reaches a preset threshold.
In a preferred embodiment of the above-mentioned defrosting control method for an air conditioner, the defrosting control method further includes: and when the running time of the air conditioner after the last defrosting reaches the maximum value Tmax of the shortest interval period of the air conditioner defrosting, controlling the air conditioner to enter a special defrosting mode.
The skilled person can understand that, according to the defrosting control method for the air conditioner, the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the air conditioner for the current defrosting are obtained, and the difference T4 between the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the air conditioner for the current defrosting is calculated to correct the actual interval period T2 of the last defrosting of the air conditioner, so as to determine the shortest interval period T5 of the next defrosting of the air conditioner, and therefore, the time interval between two adjacent defrostes of the air conditioner can be accurately adjusted and controlled according to a specific frosting condition through monitoring the actual defrosting time, so as to achieve accurate defrosting and avoid unclean defrosting or false defrosting.
Drawings
A defrost control method for an air conditioner of the present invention will be described with reference to the accompanying drawings. In the drawings:
fig. 1 is a flowchart illustrating major steps of a defrosting control method for an air conditioner according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, although the description is made in an equal-scale calculation manner, that is, by the equation: the determination method of the shortest interval period T5 for the next defrosting of the air conditioner is described as an example of calculating and determining the shortest interval period T5 for the next defrosting of the air conditioner by T5-T1/T3-T2, but the determination method of the shortest interval period T5 for the next defrosting of the air conditioner is not limited thereto as long as the determination method can correct the actual interval period T2 for the last defrosting of the air conditioner according to the current actual operating condition to determine the shortest interval period T5 for the next defrosting of the air conditioner. For example, it is also possible to calculate the difference value by the equation: and calculating and determining the shortest interval period T5 of the next defrosting of the air conditioner by T2- (T1-T3) T5.
As described in the background section, during the operation of the air conditioner, the heat exchanger exchanges heat with air, and during the heating process at low ambient temperature, especially around 0 ℃, when the evaporation temperature is lower than the dew point temperature in the air, the surface of the air conditioner evaporator will frost to different degrees, which increases the heat transfer resistance of the heat exchanger, increases the airflow flowing resistance, and reduces the heat exchange coefficient, resulting in poor performance of the heat exchanger.
The existing defrosting control method for the air conditioner generally segments the environment temperature, carries out defrosting after comparing the environment temperature with the temperature of a defrosting sensor, and sets a defrosting condition under each environment temperature segment to realize segmented control.
Therefore, the invention provides a defrosting control method for an air conditioner, which is characterized in that the control method corrects the actual interval period T2 of the last defrosting of the air conditioner by acquiring the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the current defrosting of the air conditioner and calculating the difference T4 between the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the current defrosting of the air conditioner, so as to determine the shortest interval period T5 of the next defrosting of the air conditioner, and therefore, the time interval between two adjacent defrostes of the air conditioner can be accurately adjusted and controlled according to the specific frosting condition by monitoring the actual defrosting time. And whether the air conditioner meets the defrosting condition is judged, and when the air conditioner meets the defrosting condition and the time interval from the last defrosting time is greater than or equal to the shortest interval period T5 of the next defrosting of the air conditioner, the air conditioner is controlled to enter a defrosting mode, so that accurate defrosting is realized, and incomplete defrosting or false defrosting is avoided.
Furthermore, the defrosting control method for the air conditioner also comprises a forced defrosting mode, and by setting the forced defrosting mode, the method can quickly respond and defrost in time when the environmental temperature suddenly changes or the environmental relative humidity suddenly increases.
In addition, the defrosting control method for the air conditioner also comprises a special defrosting mode, and the phenomenon that the air conditioner runs for a long time and the local frosting of the heat exchanger even causes icing due to the fact that the air conditioner does not reach the defrosting condition can be avoided by setting the special defrosting mode.
A defrosting control method for an air conditioner of the present invention will be described with reference to fig. 1.
As shown in fig. 1, the defrost control method for an air conditioner of the present invention includes the steps of:
s01: acquiring preset defrosting time T1 of the air conditioner;
specifically, a preset defrosting time T1 of the air conditioner that is previously set in the air conditioner and that enables the air conditioner to be completely defrosted is acquired.
It should be noted that, in this embodiment, the defrosting time is a time for switching the first four-way valve to the second four-way valve in one defrosting cycle.
In the present embodiment, the preset defrosting time T1 of the air conditioner includes a plurality of sets of different defrosting time periods set according to different frosting conditions.
Specifically, since there is a certain difference between the frosting conditions of the air conditioner heat exchanger under different environmental conditions, in the present embodiment, the preset defrosting time T1 of the air conditioner includes a plurality of sets of different defrosting time lengths set according to different frosting conditions.
More specifically, when the detected value of the relevant parameter of the air conditioner reaches the set threshold, the air conditioner is considered to have satisfied the defrosting condition, and different detected values correspond to different frosting degrees, so that, whenever the defrosting condition is judged to be satisfied, a corresponding one of the pre-set defrosting time T1 can be inquired from a plurality of pre-stored sets of different defrosting time lengths.
S02: acquiring an actual interval period T2 of the last defrosting of the air conditioner;
specifically, the actual interval period T2 of the last time the air conditioner defrosted is obtained, and corresponding data support is provided for the shortest interval period T5 after which the next defrosting of the air conditioner is determined. The actual interval period T2 of the last defrosting of the air conditioner is the actual operation time period from the last defrosting to the current defrosting, and the shortest interval period T5 of the next defrosting of the air conditioner is the actual operation time period from the current defrosting to the next defrosting.
It should be noted that, when the air conditioner is initially started, the actual interval period T2 of the last defrosting of the air conditioner is the time taken from the start of the operation of the air conditioner to the initial defrosting.
S03: acquiring the actual defrosting time T3 of the current defrosting of the air conditioner;
specifically, the actual defrosting time T3 of the air conditioner for the current defrosting is obtained, and data support is provided for calculating the difference T4 between the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the air conditioner for the current defrosting.
S04: calculating a difference T4 between the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the air conditioner for defrosting at this time;
specifically, the difference between the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the air conditioner during the current defrosting is calculated to determine whether the time used for the current defrosting is overtime compared with the preset defrosting time to finish defrosting or finish defrosting in advance, and the actual interval period T2 of the air conditioner during the last defrosting is corrected for the next step to determine the shortest interval period T5 of the air conditioner during the next defrosting to provide related data support.
More specifically, after entering the defrosting mode each time, the air conditioner controller collects the detection values of the relevant parameters in real time, and once the detection values of the relevant parameters are judged to reach the set threshold value, the air conditioner is controlled to exit the defrosting mode. Therefore, due to the difference in the current actual operating conditions, there is often a difference between the theoretical defrosting time at the same frosting degree, i.e., the preset defrosting time T1, and the actual defrosting time T3. The present invention is based on this difference to determine the current actual defrost need and thus correct the time interval between defrosts.
Further, the specific calculation method of the difference T4 is as follows:
t4 is the preset defrosting time T1 of the air conditioner — the actual defrosting time T3 of the air conditioner for the current defrosting;
s05: correcting the actual interval period T2 of the last defrosting of the air conditioner according to the difference T4 to determine the shortest interval period T5 of the next defrosting of the air conditioner;
specifically, the actual interval period T2 of the last defrosting of the air conditioner is corrected to determine the shortest interval period T5 of the next defrosting of the air conditioner in combination with the calculated difference value T4 and the acquired actual interval period T2 of the last defrosting of the air conditioner.
Further, the shortest interval period T5 for the next defrosting of the air conditioner is determined by:
when T4 is greater than 0, setting the shortest interval period T5 of the next defrosting of the air conditioner to be larger than the actual interval period T2 of the last defrosting of the air conditioner;
specifically, when T4>0, it is described that, in the present defrosting process, the actual defrosting time T3 of the present defrosting of the air conditioner is less than the preset defrosting time T1, that is: in the defrosting process, compared with the preset defrosting time, the defrosting operation is finished in advance.
Thus, it is shown that the actual frosting degree of the heat exchanger of the air conditioner is lighter than that of the last defrosting period, and represents that the frosting of the air conditioner is reduced due to the reduction of the relative humidity of the environment or other reasons.
Therefore, the shortest interval period T5 for the next defrosting of the air conditioner is set to be greater than the actual interval period T2 for the last defrosting of the air conditioner, i.e., the air conditioner can be operated for a longer time before the next defrosting.
When T4 is equal to 0, setting the shortest interval period T5 of the next defrosting of the air conditioner to be equal to the actual interval period T2 of the last defrosting of the air conditioner;
specifically, when T4 is equal to 0, it is described that, in the present defrosting process, the actual defrosting time T3 of the present defrosting of the air conditioner is equal to the preset defrosting time T1, that is: the time used in the defrosting process is just equal to the preset defrosting time.
Therefore, the actual frosting degree of the heat exchanger of the air conditioner is basically consistent with the condition of the last defrosting period at the moment, and the running state of the air conditioner is basically unchanged.
Therefore, the shortest interval period T5 for the next defrosting of the air conditioner is set to be equal to the actual interval period T2 for the last defrosting of the air conditioner.
When T4<0, the shortest interval period T5 for the next defrosting of the air conditioner is set to be smaller than the actual interval period T2 for the last defrosting of the air conditioner.
Specifically, when T4<0, it indicates that, in the present defrosting process, the actual defrosting time T3 of the present defrosting of the air conditioner is greater than the preset defrosting time T1, that is: in the defrosting process, compared with the preset defrosting time, the defrosting operation is overtime.
Therefore, it is explained that the actual frosting degree of the air conditioner heat exchanger is heavier than that of the last defrosting period, and represents that the frosting of the air conditioner is increased due to the increase of the relative humidity of the environment or other reasons.
Therefore, the shortest interval period T5 for the next defrosting of the air conditioner is set to be smaller than the actual interval period T2 for the last defrosting of the air conditioner, i.e., the air conditioner should perform the next defrosting as soon as possible.
In order to further obtain a more accurate shortest interval period T5 for the next defrosting of the air conditioner, the time interval between two adjacent defrosts of the air conditioner is adjusted and controlled more accurately. In the present embodiment, when T4>0 or T4<0, the shortest interval period T5 for the next defrosting of the air conditioner is calculated by the following equation: t5 ═ T1/T3 ═ T2.
Through the equal proportion calculation, namely, the ratio of the preset defrosting time T1 of the air conditioner to the actual defrosting time T3 of the air conditioner for the current defrosting is calculated to determine the frosting degree of the heat exchanger of the air conditioner in the process of the current defrosting period compared with the previous defrosting period, and the ratio is multiplied by the actual interval period T2 of the air conditioner for the last defrosting, so that the shortest interval period T5 of the air conditioner for the next defrosting is accurately calculated, and the time interval between two adjacent times of defrosting of the air conditioner is accurately adjusted and controlled according to the specific frosting condition.
It is understood that although in the present embodiment it is calculated in an equal proportion manner, i.e. by the equation: the determination method of the shortest interval period T5 for the next defrosting of the air conditioner is described as an example of calculating and determining the shortest interval period T5 for the next defrosting of the air conditioner, where T5 is T1/T3 by T2, but the determination method of the shortest interval period T5 for the next defrosting of the air conditioner in the present embodiment is not limited thereto as long as the determination method can correct the actual interval period T2 for the previous defrosting of the air conditioner according to the actual frosting degree to determine the shortest interval period T5 for the next defrosting of the air conditioner. For example, it is also possible to calculate the difference value by the equation: and calculating and determining the shortest interval period T5 of the next defrosting of the air conditioner by T2- (T1-T3) T5.
In this embodiment, the shortest interval period T5 for the next defrosting of the air conditioner can be determined by selecting an equal proportion calculation or a difference calculation to meet the requirements of different practical applications.
S06: and when the defrosting condition is met and the time interval from the last defrosting is greater than or equal to the shortest interval period T5 of the next defrosting of the air conditioner, controlling the air conditioner to enter a defrosting mode.
Specifically, for the purpose of achieving precise defrosting and avoiding incomplete defrosting or false defrosting, in the embodiment, when the air conditioner satisfies the defrosting condition and the time interval from the last defrosting time is greater than or equal to the shortest interval period T5 of the next defrosting of the air conditioner, the air conditioner is controlled to enter the defrosting mode.
It should be noted that, when the air conditioner is initially started, the air conditioner satisfies the defrosting condition, that is, the air conditioner is controlled to enter the defrosting mode.
In the present embodiment, the defrosting condition of the air conditioner is that the detected value of the relevant parameter reaches a set threshold value. Specifically, the above-mentioned related parameters may be one or more of evaporator temperature, fan rotation speed, water inlet and outlet temperature difference, and high-pressure and low-pressure. In this embodiment, different associated parameters can be selected according to actual needs, so as to perform different precision control on the air conditioner according to the requirements of different occasions.
In order to ensure the safe operation of the air conditioner, the defrosting control method for the air conditioner also comprises a forced defrosting mode, and the forced defrosting mode can meet the emergency defrosting requirement of the heat exchanger of the air conditioner when the environmental temperature suddenly changes or the environmental relative humidity suddenly increases.
As shown in fig. 1, in this embodiment, the defrosting control method of the present invention further includes:
s07: and when the forced defrosting condition is met, controlling the air conditioner to enter a forced defrosting mode.
Specifically, when the operating parameters of the air conditioner meet the forced defrosting conditions, which indicates that the ambient temperature suddenly changes or the ambient relative humidity increases, the air conditioner needs to be controlled immediately to defrost. Therefore, whether the running parameters of the air conditioner meet the forced defrosting condition or not is judged, and when the running parameters of the air conditioner meet the forced defrosting condition, the air conditioner is controlled to enter a forced defrosting mode so as to meet the emergency defrosting requirement of the air conditioner heat exchanger under the condition, and therefore the safe running of the air conditioner is guaranteed.
It should be noted that the forced defrosting condition may be that the detected value of the relevant parameter, such as the evaporator temperature, reaches a preset threshold value.
Preferably, in case of entering the forced defrost mode, the method of the present invention sets the shortest interval period T5 for the next defrosting of the air conditioner to the defrosting shortest interval period minimum value Tmin.
Specifically, when the air conditioner enters the forced defrosting mode, it is described that the frosting of the heat exchanger of the air conditioner is faster at this time, and therefore the shortest interval period T5 for the next defrosting of the air conditioner needs to be set as the minimum value Tmin of the shortest interval period for defrosting, so as to maximally shorten the time interval between two adjacent defrostes, increase the defrosting frequency, and improve the defrosting effect, thereby further better meeting the emergency defrosting requirement of the heat exchanger of the air conditioner under this condition, and thus ensuring the safe operation of the air conditioner.
With reference to fig. 1, in this embodiment, the defrosting control method of the present invention further includes:
s08: and when the running time of the air conditioner after the last defrosting reaches the maximum value Tmax of the shortest interval period of the air conditioner defrosting, controlling the air conditioner to enter a special defrosting mode.
Specifically, in the present embodiment, when the operation time of the air conditioner after the last defrosting reaches the maximum value Tmax of the shortest interval cycle of the air conditioner defrosting, the air conditioner is controlled to enter the special defrosting mode, that is: when the running time of the air conditioner reaches the maximum value Tmax of the shortest interval period of the air conditioner defrosting after the air conditioner is defrosted last time, even if the air conditioner does not reach the defrosting condition, the air conditioner needs to be defrosted for one time, so that the phenomenon that the air conditioner runs for a long time because the air conditioner does not reach the defrosting condition, partial frosting of the heat exchanger even icing is caused is avoided.
In summary, according to the defrosting control method for the air conditioner, the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the air conditioner during the current defrosting are obtained, and the difference T4 between the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the air conditioner during the current defrosting is calculated to correct the actual interval period T2 of the previous defrosting of the air conditioner, so that the shortest interval period T5 of the next defrosting of the air conditioner is determined, and therefore, the time interval between two adjacent times of defrosting of the air conditioner can be accurately adjusted and controlled according to the specific frosting condition by monitoring the actual defrosting time. And whether the air conditioner meets the defrosting condition is judged, and when the air conditioner meets the defrosting condition and the time interval from the last defrosting time is greater than or equal to the shortest interval period T5 of the next defrosting of the air conditioner, the air conditioner is controlled to enter a defrosting mode, so that accurate defrosting is realized, and incomplete defrosting or false defrosting is avoided.
Meanwhile, the defrosting control method for the air conditioner calculates and determines the shortest interval period T5 of the next defrosting of the air conditioner in an equal proportion calculation mode and a difference calculation mode so as to more accurately adjust and control the time interval between two adjacent defrosting of the air conditioner.
Furthermore, the defrosting control method for the air conditioner also comprises a forced defrosting mode, and the forced defrosting mode can meet the emergency defrosting requirement of the air conditioner when the environmental temperature suddenly changes or the environmental relative humidity suddenly increases.
In addition, the defrosting control method for the air conditioner also comprises a special defrosting mode, and the phenomenon that the air conditioner runs for a long time and the local frosting of the heat exchanger even causes icing because the air conditioner does not reach the defrosting condition is avoided by setting the special defrosting mode.
It should be noted that the above-mentioned embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can modify the above-mentioned embodiments so that the present invention can be applied to more specific application scenarios without departing from the principle of the present invention.
Furthermore, it is understood by those skilled in the art that the features of the different embodiments of the invention may be combined in any combination, and the combined solution is within the scope of the invention. For example, in the claims of the invention, any of the claimed embodiments may be used in any combination.
Moreover, although the foregoing embodiments describe the steps in the above sequential order, those skilled in the art will understand that, in order to achieve the effect of the embodiments, the steps may not be executed in such an order, and may be executed simultaneously (in parallel) or in reverse order, and these simple changes are all within the scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrost control method for an air conditioner, the defrost control method comprising:
acquiring preset defrosting time T1 of the air conditioner;
acquiring an actual interval period T2 of the last defrosting of the air conditioner;
acquiring the actual defrosting time T3 of the current defrosting of the air conditioner;
calculating a difference T4 between the preset defrosting time T1 of the air conditioner and the actual defrosting time T3 of the air conditioner for defrosting at this time;
correcting the actual interval period T2 of the last defrosting of the air conditioner according to the difference T4 to determine the shortest interval period T5 of the next defrosting of the air conditioner;
and when the defrosting condition is met and the time interval from the last defrosting is greater than or equal to the shortest interval period T5 of the next defrosting of the air conditioner, controlling the air conditioner to enter a defrosting mode.
2. A defrost control method for an air conditioner according to claim 1, characterized in that said difference T4 is calculated in a specific manner as follows:
t4 is the preset defrosting time T1-the actual defrosting time T3 of the air conditioner at this time;
the shortest interval period T5 for the next defrosting of the air conditioner is determined by the following method:
when T4>0, setting the shortest interval period T5 of the next defrosting of the air conditioner to be larger than the actual interval period T2 of the last defrosting of the air conditioner; and/or the like and/or,
when T4 is equal to 0, setting the shortest interval period T5 of the next defrosting of the air conditioner to be equal to the actual interval period T2 of the last defrosting of the air conditioner; and/or the like and/or,
when T4<0, the shortest interval period T5 for the next defrosting of the air conditioner is set to be smaller than the actual interval period T2 for the last defrosting of the air conditioner.
3. The defrost control method for an air conditioner according to claim 2, wherein when T4>0 or T4<0, the shortest interval period T5 for the next defrost of the air conditioner is calculated by the following equation: t5 ═ T1/T3 ═ T2.
4. The defrosting control method for an air conditioner according to any one of claims 1 to 3, wherein the defrosting condition of the air conditioner is that a detected value of the relevant parameter reaches a set threshold value.
5. The defrost control method for an air conditioner of claim 4, wherein the related parameters are one or more of evaporator temperature, fan speed, temperature difference of inlet and outlet water, pressure of high pressure and low pressure.
6. A defrost control method for an air conditioner according to any one of claims 1 to 3, characterized in that the preset defrost time T1 of the air conditioner includes a plurality of sets of different defrost time periods set according to different frosting conditions.
7. The defrost control method for an air conditioner according to any one of claims 1 to 3, further comprising:
judging whether a forced defrosting condition is met;
and when the forced defrosting condition is met, controlling the air conditioner to enter a forced defrosting mode.
8. The defrost control method for an air conditioner of claim 7, further comprising:
in case of entering the forced defrosting mode, the shortest interval period T5 for the next defrosting of the air conditioner is set to the defrosting shortest interval period minimum value Tmin.
9. The defrost control method for an air conditioner according to claim 7, wherein the forced defrost condition is that the detected value of the evaporator temperature reaches a preset threshold value.
10. The defrost control method for an air conditioner according to any one of claims 1 to 3, further comprising:
and when the running time of the air conditioner after the last defrosting reaches the maximum value Tmax of the shortest interval period of the air conditioner defrosting, controlling the air conditioner to enter a special defrosting mode.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111130007.1A CN113883679A (en) | 2021-09-26 | 2021-09-26 | Defrosting control method for air conditioner |
| PCT/CN2022/089003 WO2023045320A1 (en) | 2021-09-26 | 2022-04-25 | Defrosting control method for air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111130007.1A CN113883679A (en) | 2021-09-26 | 2021-09-26 | Defrosting control method for air conditioner |
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| CN113883679A true CN113883679A (en) | 2022-01-04 |
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| CN202111130007.1A Pending CN113883679A (en) | 2021-09-26 | 2021-09-26 | Defrosting control method for air conditioner |
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| WO (1) | WO2023045320A1 (en) |
Cited By (4)
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| CN114440507A (en) * | 2022-01-10 | 2022-05-06 | 珠海格力电器股份有限公司 | Defrosting control method of heat pump system |
| CN114754465A (en) * | 2022-04-29 | 2022-07-15 | 青岛海尔空调电子有限公司 | Control method and device for defrosting, defrosting control system and storage medium |
| CN115654654A (en) * | 2022-10-28 | 2023-01-31 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device and air conditioner |
| WO2023045320A1 (en) * | 2021-09-26 | 2023-03-30 | 青岛海尔中央空调有限公司 | Defrosting control method for air conditioner |
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| CN113375288A (en) * | 2021-05-14 | 2021-09-10 | 青岛海尔空调电子有限公司 | Defrosting control method for air conditioning unit |
| CN113883679A (en) * | 2021-09-26 | 2022-01-04 | 青岛海尔中央空调有限公司 | Defrosting control method for air conditioner |
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- 2021-09-26 CN CN202111130007.1A patent/CN113883679A/en active Pending
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| JPH08200901A (en) * | 1995-01-20 | 1996-08-09 | Hitachi Ltd | Defrosting controller for refrigerating plant |
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| WO2023045320A1 (en) * | 2021-09-26 | 2023-03-30 | 青岛海尔中央空调有限公司 | Defrosting control method for air conditioner |
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| CN114754465A (en) * | 2022-04-29 | 2022-07-15 | 青岛海尔空调电子有限公司 | Control method and device for defrosting, defrosting control system and storage medium |
| CN115654654A (en) * | 2022-10-28 | 2023-01-31 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device and air conditioner |
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| WO2023045320A1 (en) | 2023-03-30 |
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