CN109323372B - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- CN109323372B CN109323372B CN201811209903.5A CN201811209903A CN109323372B CN 109323372 B CN109323372 B CN 109323372B CN 201811209903 A CN201811209903 A CN 201811209903A CN 109323372 B CN109323372 B CN 109323372B
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a defrosting control method for an air conditioner. The method comprises the following steps: detecting the outdoor environment temperature to obtain an environment temperature value Tao; determining a defrosting time interval T according to the environment temperature value Tao; and controlling the air conditioner to start defrosting at least according to the defrosting time interval T. The phenomenon that the time interval T between two times of defrosting of the air conditioner is nonadjustable in a certain range (or the phenomenon that the defrosting time interval T is not fine enough) can be mainly solved, the defrosting time interval T is adjusted according to the outdoor environment temperature, the heating experience of a user can be improved, the defrosting efficiency is improved, and the phenomenon that defrosting is not clean is avoided. Namely, the defrosting time interval T is finely matched with the outdoor environment temperature Tao, so that defrosting is ensured to be clean, a heating effect is ensured, a short defrosting time interval T is distributed in an interval where frosting is easy to occur, and a long defrosting time interval T is distributed in an interval where frosting is not easy to occur.
Description
Technical Field
The invention relates to the field of air conditioner refrigeration and heating, in particular to a defrosting control method for an air conditioner.
Background
When the air conditioner heats in winter, the temperature of the condenser is low, and the surface of the condenser is easy to frost. Therefore, after the air conditioner heats for a certain period of time, the condenser needs to be defrosted. In general, after an air conditioner receives a signal for starting defrosting, the four-way valve is reversed, a refrigerant flows from the compressor to the condenser and then flows to the evaporator and then returns to the compressor, and similarly to a refrigeration mode, a high-temperature gas refrigerant discharged by the compressor passes through the condenser, so that the purposes of defrosting and defrosting are achieved.
The prior defrosting technology has the following two conditions: setting a time interval T between two times of defrosting; the condition (Te) of the defrosting sensor is less than or equal to Tes (condensation point temperature), wherein the condensation point temperature Tes is C multiplied by Tao-alpha, Tao represents outdoor environment temperature, C is a coefficient, Tao is less than 0 ℃, and C is 0.8; tao is more than or equal to 0 ℃, C is 0.6, and alpha is a coefficient: typically, α is 6. The defrosting is only started when the above two conditions are satisfied simultaneously.
The current condition (i) is defined as follows: the time interval T between the two defrosters is adjusted according to the dew point temperature Tes. If Tes is less than-13 ℃, the defrosting time interval T is 75 min; if Tes is less than-10 ℃, the defrosting time interval T is 65 min; if Tes is more than or equal to-10 ℃, the defrosting time interval T is 45 min. According to the formula Tes-C multiplied by Tao-alpha, the relation between the defrosting time interval T and the outdoor environment temperature Tao is converted.
However, the inventors found that the higher the outdoor ambient temperature is, the less the outdoor unit is susceptible to frost formation. Above 5.5 ℃ is naturally a frost-free zone, and near 0 ℃ and very close to the dew point temperature of air, so that-2 ℃ to 2 ℃ is a zone which is very easy to frost, below-2 ℃ the absolute humidity is very low, the water vapor content in the air is low, so that the frosting begins to be reduced, the lower the outdoor environment temperature is, the lower the water vapor content in the air is (at the moment, the water is ice), and below-7 ℃ the frosting is not easy to occur, so that the frosting is changed into a very little frosting zone.
Therefore, the inventors considered that when the air conditioner outdoor unit is frostless (in a frost-reduced region), it is desirable that the defrosting time interval T be longer; when the outdoor unit of the air conditioner is frosted much (in a frost region), it is desirable that the defrosting time interval T is short. Therefore, frequent defrosting of the air conditioner (in a less frost area) can be avoided, and defrosting can be guaranteed to be clean (in a more frost area), and the purpose of doing so is to improve the heating experience of a user. In the prior art, the setting of the defrosting time interval T of the air conditioner does not strictly correspond to the distribution area of the frosting degree, particularly when Tao is higher than-5 ℃, the defrosting time interval T only has a set value of 45min, and the set distribution of T is not fine enough. At present, T is set to 45min as long as Tao is > -5 ℃, and particularly, defrosting is not clean when Tao is about 0 ℃. Further, the inventor sets T to 30min for defrosting, and finds that a new problem occurs, such as that Tao is 2 ℃, the heating capacity in one period is insufficient, and the national standard requirement cannot be met. And the heating capacity requirement of the national standard to 2 ℃ can be preferentially ensured by setting T to be about 45 min. The inventors have found that simply changing the set defrost interval can take care of it.
Disclosure of Invention
The invention aims to overcome at least one defect of the existing air conditioner defrosting, and provides an air conditioner defrosting control method, which is used for finely matching a defrosting time interval T with an outdoor temperature Tao, so that defrosting is ensured to be clean, and a heating effect is ensured.
Therefore, the invention provides a defrosting control method of an air conditioner, which comprises the following steps:
detecting the outdoor environment temperature to obtain an environment temperature value Tao;
determining a defrosting time interval T according to the environment temperature value Tao;
and controlling the air conditioner to start defrosting at least according to the defrosting time interval T.
Preferably, the defrosting time interval T is determined according to a relation between the ambient temperature value Tao and the defrosting time interval T; the relation is as follows:
Preferably, when the outdoor environment temperature is less than-15 ℃, determining the environment temperature value Tao to be-15 ℃;
and when the outdoor environment temperature is higher than 5.5 ℃, determining that the environment temperature value Tao is 5.5 ℃.
Preferably, the ambient temperature value is detected after the air conditioner exits defrosting.
Preferably, the outdoor environment temperature is detected to obtain an environment temperature value Tao; determining a defrosting time interval T according to the ambient temperature value Tao, which specifically includes:
detecting the outdoor ambient temperature;
determining the obtained temperature value as the environment temperature Tao, and determining a defrosting time interval T according to the environment temperature value Tao;
continuing to detect the outdoor ambient temperature until the air conditioner begins to defrost;
and judging whether the obtained temperature value changes and lasts for a preset time, if so, determining that the changed temperature value which lasts for the preset time is the updated environment temperature Tao, and updating the defrosting time interval T according to the updated environment temperature value Tao.
Preferably, the preset time is 2.5s to 3.5 s.
Preferably, the air conditioner defrosting control method further includes:
when the air conditioner starts defrosting, detecting the outdoor environment temperature to obtain an environment temperature value x;
determining defrosting time y according to the environment temperature value x;
and after the defrosting time y is reached, the defrosting is quitted.
Preferably, the defrosting time y is determined according to a relation between the defrosting time y and the environmental temperature value x; the relation is
The unit of the defrosting time y is min, and the unit of the environmental temperature value x is ℃.
Preferably, the controlling the air conditioner to start defrosting at least according to the defrosting time interval T specifically includes:
controlling the air conditioner to start defrosting according to the defrosting time interval T and the air speed of an outdoor unit of the air conditioner; or the like, or, alternatively,
controlling the air conditioner to start defrosting according to the defrosting time interval T and the fan current of the outdoor unit of the air conditioner; or the like, or, alternatively,
and controlling the air conditioner to start defrosting according to the defrosting time interval T, the temperature detected by a defrosting sensor of the air conditioner and the condensation point temperature.
Preferably, the air conditioner defrosting control method further includes:
when the air conditioner starts defrosting, stopping a compressor of the air conditioner for a first preset time, and simultaneously, operating a fan of an outdoor unit of the air conditioner for a second preset time at a preset speed; the first preset time is greater than or equal to the second preset time;
after a third preset time, changing the flow direction of a four-way valve of the air conditioner; the second preset time is greater than or equal to the third preset time;
after the second preset time, turning off the fan of the outdoor unit;
after the first preset time, starting the compressor;
after a fourth preset time, turning off the compressor;
after the fifth preset time, the defrosting is quitted; and the defrosting time y is equal to the sum of the first preset time, the fourth preset time and the fifth preset time.
The defrosting control method of the air conditioner can mainly solve the phenomenon that the time interval T between two times of defrosting of the air conditioner is not adjustable in a certain range (or not fine enough), and can improve the heating experience of users by adjusting the defrosting time interval T according to the outdoor environment temperature, improve the defrosting efficiency and avoid the phenomenon of incomplete defrosting. Namely, the defrosting time interval T is finely matched with the outdoor environment temperature Tao, so that defrosting is ensured to be clean, a heating effect is ensured, a short defrosting time interval T is distributed in an interval where frosting is easy to occur, and a long defrosting time interval T is distributed in an interval where frosting is not easy to occur.
Furthermore, in the defrosting control method of the air conditioner, the defrosting time is matched with the frosting severity of the outdoor unit, namely, a long defrosting time point is distributed to a region with severe frosting, and a short defrosting time point is distributed to a region with non-severe frosting, so that the defrosting efficiency is improved, and the phenomenon of incomplete defrosting is avoided. Furthermore, the defrosting time near 0 ℃ can be ensured to be relatively long, the defrosting efficiency is improved, and the phenomenon of incomplete defrosting is avoided. The problem that the defrosting time of the air conditioner is not matched with the working condition can be solved, and the defrosting efficiency under each working condition is improved. Because the frosting degree of the outdoor unit of the air conditioner is different under different working conditions, the required defrosting time is also different.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic flowchart of an air conditioner defrost control method according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic flowchart of an air conditioner defrost control method according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides a defrosting control method for an air conditioner, which may include the following steps:
and detecting the outdoor environment temperature to obtain an environment temperature value Tao. For example, the ambient temperature value may be detected after each time the air conditioner exits defrost.
The defrost time interval T is determined from the ambient temperature value Tao.
And controlling the air conditioner to start defrosting at least according to the defrosting time interval T. For example, the air conditioner may be controlled to start defrosting only according to the defrosting time interval T. That is, after the heating time of the air conditioner reaches the corresponding defrosting time interval T from the last defrosting quitting time, the air conditioner is controlled to start defrosting. Of course, after comprehensive judgment is carried out by combining other conditions, the air conditioner is controlled to start defrosting.
In some preferred embodiments of the present invention, the defrost interval T is determined from a relationship between the ambient temperature value Tao and the defrost interval T. The relation is as follows:
According to the defrosting control method of the air conditioner, the defrosting time interval T can be finely matched with the outdoor environment temperature Tao, so that defrosting is guaranteed to be clean, a heating effect is guaranteed, a short defrosting time interval T is distributed in an interval where frosting is easy to occur, and a long defrosting time interval T is distributed in an interval where frosting is not easy to occur.
In this embodiment, the defrosting time interval T is decreased and then increased as the outdoor ambient temperature Tao increases, and when Tao is 0 ℃, the defrosting time interval T is minimum. The arrangement can ensure the defrosting to be clean and the heating effect. For example, when Tao is 0 ℃, T is 45min in the prior art scheme, the time is too long, the outdoor unit frosts very much, so that the defrosting is not clean, and the residual frost is more and more, and in addition, in the latter half of a cycle, because frosting is too much, the attenuation of the heating capacity is very serious, the air outlet temperature is very low, so that the heating effect is poor. This application with the more meticulous matching of defrosting time interval T and outdoor ambient temperature Tao, it is more reasonable to set up, can guarantee that the defrosting is clean, can guarantee again to heat the effect.
Further, when the outdoor environment temperature is less than-15 ℃, the environment temperature value Tao is determined to be-15 ℃. When the outdoor environment temperature is higher than 5.5 ℃, the environment temperature value Tao is determined to be 5.5 ℃.
In some embodiments of the present invention, the outdoor ambient temperature is detected to obtain an ambient temperature value Tao. Determining a defrosting time interval T according to the ambient temperature value Tao, specifically including:
and detecting the outdoor environment temperature.
The obtained temperature value is determined to be the ambient temperature Tao, and the defrosting time interval T is determined according to the ambient temperature value Tao.
The outdoor ambient temperature continues to be detected until the air conditioner starts defrosting.
And judging whether the obtained temperature value changes and lasts for a preset time, if so, determining that the changed temperature value which lasts for the preset time is the updated environment temperature Tao, and updating the defrosting time interval T according to the updated environment temperature value Tao. The preset time is 2.5s to 3.5s, preferably 3 s.
In this embodiment, that is, the defrosting time interval T can be calculated according to the relational expression between the ambient temperature value Tao and the defrosting time interval T, since the ambient temperature value Tao changes in real time, Tao is detected in real time before the next defrosting is entered after the defrosting is exited, if Tao changes to Tao ' and Tao ' is maintained for 3 seconds, the defrosting time interval T is updated according to Tao ' from the relational expression between the ambient temperature value Tao and the defrosting time interval T, and the real-time detection process is continued until the next defrosting is entered after the defrosting condition is satisfied.
For example, if the first detection Tao is 1.5 before the exit defrosting is started and the next defrosting is not started, T is 41min, the real-time detection Tao is continued, if the Tao changes to Tao ' 2.6 and the Tao ' is maintained for 3s, the environmental temperature value Tao and the defrosting time interval T are calculated and updated to T is 48min from the relational expression between the environmental temperature value Tao and the defrosting time interval T, the real-time detection is continued before the next defrosting is started, and if the Tao ' is not changed any more than 2.6, the final defrosting interval time is T is 48 min.
In some embodiments of the present invention, the air conditioner defrosting control method further includes the steps of:
and when the air conditioner starts defrosting, detecting the outdoor environment temperature to obtain an environment temperature value x. When the air conditioner starts defrosting, a plurality of outdoor environment temperatures can be continuously obtained, and the average value of the plurality of outdoor environment temperatures is determined as an environment temperature value x.
And determining the defrosting time y according to the ambient temperature value x. That is to say, the defrosting time is matched with the frosting severity of the outdoor unit, namely, a long defrosting time point is allocated to a region with severe frosting, and a short defrosting time point is allocated to a region with non-severe frosting, so that the defrosting efficiency is improved, and the phenomenon of incomplete defrosting is avoided.
And after reaching the defrosting time y, the defrosting is quitted. After the defrosting is exited, the air conditioner can enter an indoor heating mode or other working modes according to an internal setting program.
In some preferred embodiments of the invention, the defrost time y is determined from a relationship between the defrost time y and the ambient temperature value x. Has a relation of
Wherein, the unit of defrosting time y is min, and the unit of environmental temperature value x is ℃.
In this embodiment, it should be noted that when x > 5.5 ℃, defrosting is not generally performed, but some special cases may cause defrosting to be performed, so when x > 5.5 ℃, y is set to 4min so that defrosting can be performed, because defrosting must be performed after defrosting is performed.
In some embodiments of the present invention, said controlling the air conditioner to start defrosting at least according to the defrosting time interval T specifically includes:
and controlling the air conditioner to start defrosting according to the defrosting time interval T and the air speed of the outdoor unit of the air conditioner. Or the like, or, alternatively,
and controlling the air conditioner to start defrosting according to the defrosting time interval T and the fan current of the outdoor unit of the air conditioner. Or the like, or, alternatively,
and controlling the air conditioner to start defrosting according to the defrosting time interval T, the temperature detected by a defrosting sensor of the air conditioner and the condensation point temperature.
Specifically, in some embodiments, an air speed sensor may be disposed at a position of the outdoor unit of the air conditioner where the maximum air outlet speed of the air outlet grid is.
The method comprises the steps of detecting the wind speed of an outdoor unit or presetting the wind speed of the outdoor unit to obtain a first wind speed when the air conditioner starts to heat every time, when the air conditioner quits defrosting to start to heat or when the air conditioner starts to heat for the first time. The first wind speed may also be understood as the wind speed of the fan without any frost on the outdoor unit.
And detecting the wind speed of the outdoor unit to obtain a second wind speed. The wind speed may be detected at intervals of 30 seconds in period to obtain the second wind speed.
And controlling the air conditioner to start defrosting when the difference between the first wind speed and the second wind speed is less than or equal to a preset difference and lasts for a preset time length and the time after the last defrosting is finished is greater than the corresponding defrosting time interval T.
The inventor found that the wind speed is decreasing as the frost formation of the outdoor unit increases. When the wind speed is reduced to a certain degree, the frost layer on the outdoor unit is relatively thick, and defrosting is needed. And the defrosting time interval T is combined, so that the accidental sudden change of the wind speed caused by vibration and other reasons can be prevented, and misoperation can be prevented. The preset duration may be 1.5 to 3min, preferably 2 min. The wind speed sensor has high detection precision, and can accurately judge defrosting time through wind speed change before and after frosting, thereby improving the heating comfort of users. Certainly, when the outdoor heat exchanger is full of dust, the judgment of defrosting time is not influenced, because the judgment is carried out according to the difference of wind speeds before and after frosting.
In other embodiments of the present invention, the first current is obtained by detecting a fan current of the outdoor unit or presetting the fan current of the outdoor unit each time the air conditioner is turned on to start heating, when the air conditioner is turned off to defrost to start heating, or when the air conditioner is turned on for the first time to start heating.
And detecting the current of a fan of the outdoor unit to obtain a second current.
And controlling the air conditioner to start defrosting when the difference between the first current and the second current is less than or equal to a preset difference and continues for a preset time length and the time after the last defrosting is finished is greater than the corresponding defrosting time interval T.
In some embodiments of the present invention, when defrosting is started, a compressor of the air conditioner is stopped for a first preset time, and a fan of an outdoor unit of the air conditioner is operated at a preset speed for a second preset time. The first preset time is greater than or equal to the second preset time. When defrosting is started, the fan of the outdoor unit can be increased, so that the fan of the outdoor unit operates for a second preset time at a preset speed. The blower of the outdoor unit is operated at a high speed for a second preset time to unload the pressure of the refrigeration system.
And after the third preset time, changing the flow direction of a four-way valve of the air conditioner. The second preset time is greater than or equal to the third preset time. And after the second preset time, the fan of the outdoor unit is turned off. And after the first preset time, starting the compressor.
And after the fourth preset time, closing the compressor. And after the fifth preset time, the defrosting is quitted. Switch back to heating mode. And the defrosting time y is equal to the sum of the first preset time, the fourth preset time and the fifth preset time. The effective defrost time may be a fourth preset time.
The first preset time is 50s to 70s, preferably 60 s. The second preset time is 45s to 65s, preferably 55 s. The third preset time is 40s to 60s, preferably 50 s. The fifth preset time is 50s to 70s, preferably 60 s. After the first preset time, the opening degree of the electronic expansion valve of the air conditioner is also set to be the maximum opening degree, so that the influence of the refrigeration mode adopted during defrosting on the indoor temperature is reduced as much as possible. After defrosting is started or after a first preset time, a fan of an indoor unit of the air conditioner is turned off so as to reduce the influence of a refrigeration mode adopted during defrosting on the indoor temperature as much as possible. After a first preset time, the compressor is operated at a preset frequency.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (8)
1. A defrosting control method of an air conditioner is characterized by comprising the following steps:
detecting the outdoor environment temperature to obtain an environment temperature value Tao;
determining a defrosting time interval T according to the environment temperature value Tao;
controlling the air conditioner to start defrosting at least according to the defrosting time interval T; when the air conditioner starts defrosting, stopping a compressor of the air conditioner for a first preset time, and simultaneously, operating a fan of an outdoor unit of the air conditioner for a second preset time at a preset speed; the first preset time is greater than or equal to the second preset time; after a third preset time, changing the flow direction of a four-way valve of the air conditioner; the second preset time is greater than or equal to the third preset time; after the second preset time, turning off the fan of the outdoor unit; after the first preset time, starting the compressor; after a fourth preset time, turning off the compressor; after the fifth preset time, the defrosting is quitted; and is
Determining the defrosting time interval T according to a relational expression between the environment temperature value Tao and the defrosting time interval T; the relation is
Wherein the unit of the defrosting time interval T is min, and the unit of the environmental temperature value Tao is ℃.
2. The air conditioner defrost control method of claim 1,
when the outdoor environment temperature is lower than-15 ℃, determining the environment temperature value Tao to be-15 ℃;
and when the outdoor environment temperature is higher than 5.5 ℃, determining that the environment temperature value Tao is 5.5 ℃.
3. The air conditioner defrost control method of claim 1,
and detecting the environmental temperature value after the air conditioner is defrosted.
4. The air conditioner defrost control method of claim 1 or 3,
detecting the outdoor environment temperature to obtain an environment temperature value Tao; determining a defrosting time interval T according to the ambient temperature value Tao, which specifically includes:
detecting the outdoor ambient temperature;
determining the obtained temperature value as the environment temperature value Tao, and determining a defrosting time interval T according to the environment temperature value Tao;
continuing to detect the outdoor ambient temperature until the air conditioner begins to defrost;
and judging whether the obtained temperature value changes and lasts for a preset time, if so, determining that the changed temperature value which lasts for the preset time is the updated environment temperature value Tao, and updating the defrosting time interval T according to the updated environment temperature value Tao.
5. The air conditioner defrost control method of claim 4,
the preset time is 2.5s to 3.5 s.
6. The air conditioner defrost control method of claim 1, further comprising:
when the air conditioner starts defrosting, detecting the outdoor environment temperature to obtain an environment temperature value x;
determining defrosting time y according to the environment temperature value x;
after reaching the defrosting time y, the defrosting is quitted; the defrosting time y is equal to the sum of the first preset time, the fourth preset time and the fifth preset time.
7. The air conditioner defrost control method of claim 6,
determining the defrosting time y according to a relational expression between the defrosting time y and the environment temperature value x; the relation is
The unit of the defrosting time y is min, and the unit of the environmental temperature value x is ℃.
8. The air conditioner defrost control method of claim 1,
controlling the air conditioner to start defrosting at least according to the defrosting time interval T, specifically comprising:
controlling the air conditioner to start defrosting according to the defrosting time interval T and the air speed of an outdoor unit of the air conditioner; or the like, or, alternatively,
controlling the air conditioner to start defrosting according to the defrosting time interval T and the fan current of the outdoor unit of the air conditioner; or the like, or, alternatively,
and controlling the air conditioner to start defrosting according to the defrosting time interval T, the temperature detected by a defrosting sensor of the air conditioner and the condensation point temperature.
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| CN109883127A (en) * | 2019-03-06 | 2019-06-14 | 广东瑞星新能源科技有限公司 | A kind of intelligent defrosting control method |
| CN111895601A (en) * | 2019-05-06 | 2020-11-06 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN111895598B (en) * | 2019-05-06 | 2022-04-19 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN111895591B (en) * | 2019-05-06 | 2021-12-21 | 重庆海尔空调器有限公司 | Control method and device for defrosting of air conditioner and air conditioner |
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