CN111692709A - Air conditioner defrosting control method and device and air conditioner - Google Patents
Air conditioner defrosting control method and device and air conditioner Download PDFInfo
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- CN111692709A CN111692709A CN202010616179.9A CN202010616179A CN111692709A CN 111692709 A CN111692709 A CN 111692709A CN 202010616179 A CN202010616179 A CN 202010616179A CN 111692709 A CN111692709 A CN 111692709A
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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
- 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
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention provides a control method and a control device for defrosting of an air conditioner and the air conditioner, wherein the control method for defrosting of the air conditioner comprises the following steps: determining the duration of the air conditioner in the high-temperature prevention state and the temperature of a coil pipe in the air conditioner; and controlling the air conditioner to defrost according to the duration of the high-temperature prevention state of the air conditioner and the temperature of the coil pipe in the air conditioner. The control method and the control device for defrosting of the air conditioner and the air conditioner can accurately judge the frosting condition, so that defrosting can be accurately controlled.
Description
The application is a divisional application, the application number of a parent application is 201910268396.0, the application date is 2019, 04 and 03, and the invention name is as follows: a control method and a control device for defrosting of an air conditioner and the air conditioner.
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and a control device for defrosting of an air conditioner and the air conditioner.
Background
An air conditioner, which is a device capable of adjusting the temperature of an indoor environment, generally has an operation mode including a heating operation and a cooling operation.
When the air conditioner is operated in a heating operation mode, the temperature of the pipe of the indoor unit is possibly high, and in order to prevent damage to air conditioner hardware, the air conditioner can be controlled to enter a high-temperature-prevention protection state. In addition, when the air conditioner is in heating operation, the surface temperature of the evaporator can reach below zero, which causes the surface of the evaporator to frost, and the excessive frost can cause the air flow to be blocked, which affects the heating function of the air conditioner.
However, the existing defrosting scheme still has the following technical defects:
1. because of the cost, the conventional constant speed air conditioner generally does not have a temperature controller on an outdoor unit, defrosting is mainly judged according to the temperature reduction of an inner coil, but defrosting cannot be accurately controlled under the condition that the temperature of the inner coil is unchanged or higher;
2. the air conditioner frequently enters a small room and is prevented from high temperature, or the air conditioner enters the small room and is prevented from high temperature and cannot exit the small room for a long time, so that the air conditioner cannot enter defrosting, and user experience is influenced.
Disclosure of Invention
In order to solve at least one of the above technical defects, the present invention provides a control method, a control device and an air conditioner for defrosting an air conditioner, so as to accurately judge the frosting condition, thereby accurately controlling the defrosting, and the specific technical scheme is as follows:
one aspect of the present invention provides a method for controlling defrosting of an air conditioner, including: determining the duration of the air conditioner in the high-temperature prevention state and the temperature of a coil pipe in the air conditioner; and controlling the air conditioner to defrost according to the duration of the high-temperature prevention state of the air conditioner and the temperature of the coil pipe in the air conditioner.
Optionally, determining the duration of the air conditioner in the current high-temperature-resistant state includes: and starting timing from the moment when the air conditioner enters the current high-temperature-resistant state, and determining the duration time of the air conditioner in the current high-temperature-resistant state.
Optionally, the air conditioner is controlled to defrost according to the duration of the high temperature prevention state of the air conditioner and the temperature of the coil pipe in the air conditioner: and if the duration time of the air conditioner in the high-temperature prevention state exceeds a time threshold T3 and the temperature of the coil pipe in the air conditioner exceeds a temperature threshold a, controlling the air conditioner to defrost.
Alternatively, T3 is between 18 and 25 minutes, a is between 45 and 50 ℃.
Optionally, if the duration of the air conditioner in the current high temperature prevention state exceeds a time threshold T3, and the temperature of the coil in the air conditioner exceeds a temperature threshold a, controlling the air conditioner to perform defrosting includes:
and judging whether the high-temperature prevention period is prolonged or not to control the air conditioner to perform defrosting when the air conditioner cannot exit the high-temperature prevention state again, wherein the high-temperature prevention period is the time difference between the time when the air conditioner enters the high-temperature prevention state and the time when the air conditioner exits the high-temperature prevention state.
Optionally, the determining whether the high temperature prevention period is lengthened includes:
if Δ tk+1＞ΔtkJudging that the high temperature prevention period is prolonged;
wherein, Δ tk+1＝tn+2-tn+1For this exit of the time difference of the high temperature resistant state, Δ tk＝tn+1-tnFor the previous exit of the time difference of the high temperature prevention state, wherein, tnIs the nth high temperature protection cycle end time, tn+1Is the n +1 th high temperature resistant cycle end time, tn+2The end time of the (n + 2) th high temperature prevention period.
Another aspect of the present invention provides an air conditioner defrosting control apparatus, including: the determining unit is used for determining the duration of the air conditioner in the high-temperature prevention state and the temperature of the coil pipe in the air conditioner; and the control unit is used for controlling the air conditioner to defrost according to the duration time of the high-temperature prevention state of the air conditioner and the temperature of the coil pipe in the air conditioner.
Optionally, the control unit is configured to control the air conditioner to perform defrosting when the duration of the air conditioner in the current high temperature prevention state exceeds a time threshold T3 and the temperature of the coil in the air conditioner exceeds a temperature threshold a.
Optionally, the control unit is further configured to determine whether the high temperature prevention period is lengthened, to determine that the air conditioner cannot exit the high temperature prevention again, and control the air conditioner to perform defrosting.
Another aspect of the present invention provides an air conditioner including a control apparatus.
Compared with the prior art, the control method and the control device for defrosting of the air conditioner and the air conditioner provided by the invention have the following advantages:
(1) the invention mainly judges that the air conditioner can not enter the high temperature prevention state through the time difference of a plurality of high temperature prevention state quitting states or judges that the air conditioner can not quit the high temperature prevention state through the duration time of the air conditioner in the high temperature prevention state and the temperature of the coil pipe in the air conditioner, thereby accurately judging the frosting condition, accurately controlling the defrosting, and effectively solving the technical problem that the existing air conditioner can not carry out the defrosting under the condition of defrosting.
(2) The invention judges the defrosting degree by utilizing the difference value of the maximum value and the minimum value in the time difference of the plurality of high temperature prevention state quitting states, further improves the accuracy of defrosting control, and avoids the influence on the performance of the air conditioner caused by the frequent entering of the air conditioner into the high temperature prevention protection state.
(3) Before the frosting degree is judged, the difference value of the maximum value and the minimum value in the time difference of the plurality of high temperature exit prevention states is used for judging the frosting starting respectively, so that the error of the value-taking time point is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a control method for defrosting an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a temperature variation of the inner coil according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for controlling defrosting of an air conditioner according to an embodiment of the present invention;
FIG. 4 is another flowchart illustrating a method for controlling defrosting of an air conditioner according to an embodiment of the present invention;
FIG. 5 is another schematic diagram illustrating the temperature variation of the inner coil according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a control device for defrosting an air conditioner according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
The invention provides a control method for defrosting an air conditioner, which comprises the following steps of:
s1, determining m time differences delta t of exiting high-temperature-resistant state1～Δtm；
And S2, controlling the air conditioner to defrost according to the m time differences of the exit high-temperature-resistant state.
The time difference of exiting the high temperature prevention state is also called as the time period of exiting the high temperature prevention state, and is the time difference of two adjacent times of exiting the high temperature prevention state, namely, the time of exiting the high temperature prevention state for the previous time of the two adjacent times is taken as the starting time, the time of exiting the high temperature prevention state for the next time of the two adjacent times is taken as the ending time, and the time is elapsed from the starting time to the ending time. Specifically, the kth time difference Δ t of exiting the anti-hot statek＝tn+1-tn，tn+1For the (n + 1) th time of exiting the high temperature resistant state, tnFor the nth time of exiting the high-temperature-resistant state, k is 1-m, n is optionally k +4, m, n and k are integers, and Δ t1For the 1 st time difference of exiting from the high temperature resistant state, Δ tmThe mth time difference for exiting the anti-high temperature state.
Therefore, the frosting condition is accurately judged by exiting the high-temperature-prevention state time difference, so that the defrosting is accurately controlled, and the technical problem that the existing air conditioner cannot perform defrosting under the condition that defrosting is required is effectively solved.
According to m time differences delta t of exiting high-temperature-resistant state1～ΔtmMaximum value Δ t inmaxAnd a minimum value Δ tminControlling an air conditioner to perform defrosting, specifically: judging whether delta t is satisfiedmax-ΔtminAnd if yes, controlling the air conditioner to defrost, wherein T1 is a first threshold value. Therefore, the defrosting degree is judged through the difference value between the maximum value and the minimum value in the time difference of the plurality of exit high-temperature prevention states, the accuracy of defrosting control is further improved, and the condition that the performance of the air conditioner is influenced when the air conditioner frequently enters the high-temperature prevention protection state is avoided.
Alternatively, in determining whether Δ t is satisfiedmax-ΔtminBefore T1, the method also comprises the following steps: judging whether delta t is satisfiedk-Δtk-1T2, wherein T2 is the second threshold, if yes, then determine whether Δ T is satisfiedmax-ΔtminT1. Therefore, before the frosting degree is judged, the difference value of the maximum value and the minimum value in the time difference of the plurality of high-temperature-resistant exiting states is used for judging the frosting starting respectively, and the error of the value-taking time point is avoided.
The time difference of exiting the high temperature prevention state is the difference of the adjacent moments of exiting the high temperature prevention state twice. In order to prevent misjudgment and further improve the defrosting judgment accuracy, n is not less than 5, but the method is not limited to the method. Taking n to 5 as an example, the time difference of exiting the high temperature resistant state is described, wherein the monitoring is started from the end of the 5 th high temperature resistant period, and the 1 st time difference of exiting the high temperature resistant state is the time difference between the 6 th time of exiting the high temperature resistant state and the 5 th time of exiting the high temperature resistant state, namely delta t1＝t6-t5The time difference of the 2 nd exit from the high temperature resistant state is the time difference between the 7 th exit from the high temperature resistant state and the 6 th exit from the high temperature resistant state, namely delta t2＝t7-t6Please refer to fig. 2. By analogy, the time difference of each exit high temperature resistant state can be obtained. In addition, the case where n > 5 is similar to that described above, and will not be described herein again.
In one embodiment, as shown in fig. 2-3, the present invention monitors the temperature of the inner coil of the air conditioner, starting from the end of the 5 th anti-high temperature cycle, and determines the time difference Δ t between each exit of the anti-high temperature cycle and the last exit of the anti-high temperature cyclek( k 1, 2, 3, 4.. said., m), when Δ tmax-ΔtminJudging that frosting begins when the time is more than or equal to 20 seconds, wherein the time for exiting the high-temperature-resistant period is also the time for ending the high-temperature-resistant period; the air conditioner continues to operate when the delta tmax-ΔtminWhen the frosting thickness reaches a certain degree when the frosting thickness is more than or equal to 5 minutes, the air conditioner does not enter high temperature prevention due to frosting and insufficient heat, and then the defrosting is controlled to enter, wherein delta tmaxIs the time difference Δ t1～ΔtmMaximum value of, Δ tminIs the time difference Δ t1～ΔtmMinimum value of (1). In this embodiment, as shown in fig. 2, in the process of preventing high temperature from entering and exiting, the period is continuously increased, the influence on the tube temperature is gradually weakened when the system heats, so as to reflect the influence of frosting on the system, and when reaching a certain degree, the period is very long and even is maintained near the zero limit temperature of preventing high temperature from entering or exiting, and the cycle cannot be executed again.
The invention provides a control method for defrosting an air conditioner, which comprises the following steps of:
s1, determining the duration time of the air conditioner in the high temperature prevention state and the temperature of the coil pipe in the air conditioner;
and S2, controlling the air conditioner to defrost according to the duration of the high-temperature prevention state of the air conditioner and the temperature of the coil pipe in the air conditioner.
In an embodiment, the determining that the air conditioner is in the present duration of the high temperature prevention state includes: and starting timing from the moment when the air conditioner enters the current high-temperature-resistant state, and determining the duration time of the air conditioner in the current high-temperature-resistant state.
Controlling the air conditioner to defrost according to the duration time of the high-temperature prevention state of the air conditioner and the temperature of the coil pipe in the air conditioner, which specifically comprises the following steps: if the duration time of the air conditioner in the high-temperature prevention state exceeds a time threshold T3 and the temperature of the coil in the air conditioner exceeds a temperature threshold a, the air conditioner is judged not to exit from the high-temperature prevention state, and the air conditioner is controlled to perform defrosting.
In another embodiment, if the duration of the air conditioner in the present high temperature prevention state exceeds a time threshold T3, and the temperature of the coil in the air conditioner exceeds a temperature threshold a, controlling the air conditioner to perform defrosting includes: and judging whether the high-temperature prevention period is prolonged or not so as to control the air conditioner to execute defrosting when the air conditioner cannot exit the high-temperature prevention state again, wherein the high-temperature prevention period is the time difference between the time when the air conditioner enters the nth high-temperature prevention state and the time when the air conditioner exits the nth high-temperature prevention state.
In another embodiment, the determining whether the high temperature prevention period is lengthened includes: if Δ tk+1＞ΔtkJudging that the high temperature prevention period is prolonged; wherein, the k +1 th exits the time difference delta t of the high temperature prevention statek+1＝tn+2-tn+1The kth time difference of exiting the high temperature resistant state is delta tk＝tn+1-tnThe time difference of the previous exit high temperature prevention state is the immediately preceding high temperature prevention state relative to the current high temperature prevention state; wherein, tnIs the nth high temperature protection cycle end time, tn+1Is the n +1 th high temperature resistant cycle end time, tn+2K is 1-m for the n +2 th high temperature-resistant period ending time, n is k +4, m, n and k are integers, and delta t1For the 1 st time difference of exiting from the high temperature resistant state, Δ tmThe mth time difference for exiting the anti-high temperature state.
In another embodiment, the air conditioner starts monitoring at the end of the 5 th high temperature prevention period, and records that the end time of the 5 th high temperature prevention period is t5, the end time of the 6 th high temperature prevention period is t6, and the end time of the 7 th high temperature prevention period is t 7; if Δ tk+1＞ΔtkJudging that the high temperature prevention period is prolonged; when the air conditioner is in the high-temperature-resistant state for the duration delta t being more than or equal to 20 minutes, the temperature of the inner coil exceeds 48 ℃, as shown in figure 5, the air conditioner cannot be used againWhen the temperature is prevented, the defrosting is controlled to be started.
The present invention also provides a control device for defrosting an air conditioner, as shown in fig. 6, the control device for defrosting an air conditioner includes:
a determination unit for determining m time differences Δ t for exiting the anti-high temperature state1～Δtm；
The control unit is used for controlling the air conditioner to defrost according to the time difference of the plurality of high-temperature-resistant exiting states;
wherein, the kth time difference delta t of exiting high temperature prevention statek＝tn+1-tn，tn+1For the (n + 1) th time of exiting the high temperature resistant state, tnAnd k is 1-m for the nth time of exiting the high-temperature-resistant state, n is optionally equal to k +4, n is not less than 5, and m, n and k are integers.
Wherein the control unit is used for exiting the high temperature prevention state time difference delta t according to the m1～ΔtmMaximum value Δ t inmaxAnd a minimum value Δ tminControlling an air conditioner to perform defrosting, specifically, controlling a unit at Δ tmax-ΔtminAnd controlling the air conditioner to perform defrosting at the time of being more than or equal to T1, wherein T1 is a first threshold value.
Optionally, the control unit is adapted to control the motor at Δ tk-Δtk-1T2, and Δ Tmax-ΔtminAnd controlling the air conditioner to perform defrosting at the time of being equal to or more than T1, wherein T1 is a first threshold value, and T2 is a second threshold value.
The invention also provides a control device for defrosting of the air conditioner, which comprises the following components:
the determining unit is used for determining the duration of the air conditioner in the high-temperature prevention state and the temperature of the coil pipe in the air conditioner;
and the control unit is used for controlling the air conditioner to defrost according to the duration time of the high-temperature prevention state of the air conditioner and the temperature of the coil pipe in the air conditioner.
Specifically, the control unit is configured to control the air conditioner to perform defrosting when the duration of the high temperature prevention state of the air conditioner exceeds a time threshold T3 and the temperature of the coil in the air conditioner exceeds a temperature threshold a.
In the invention, in order to further improve the accuracy of frost judgment and frost control, T1 is between 3 and 8 minutes, and 5 minutes can be selected; t2 is between 15 and 25 seconds, and 20 seconds is selected; t3 is between 18 and 25 minutes, and 20 minutes can be selected; a is between 45 and 50 ℃, and is optionally 48 ℃.
The invention also provides an air conditioner, which comprises the control device.
The present invention has been described in detail with reference to the accompanying drawings. From the above description, those skilled in the art should clearly recognize the present invention.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
determining the duration of the air conditioner in the high-temperature-resistant state and the temperature of a coil pipe in the air conditioner;
and controlling the air conditioner to defrost according to the duration time of the high-temperature prevention state of the air conditioner and the temperature of the coil pipe in the air conditioner.
2. The control method according to claim 1, wherein determining the duration of the air conditioner in the current high temperature prevention state comprises:
and starting timing from the moment when the air conditioner enters the current high-temperature-resistant state, and determining the duration time of the air conditioner in the current high-temperature-resistant state.
3. The control method according to claim 1, wherein controlling the air conditioner to perform defrosting according to the duration of the air conditioner in the current high temperature prevention state and the temperature of the coil in the air conditioner comprises:
and if the duration time of the air conditioner in the high-temperature prevention state exceeds a time threshold T3 and the temperature of the coil pipe in the air conditioner exceeds a temperature threshold a, controlling the air conditioner to defrost.
4. The control method according to claim 3,
t3 is between 18 and 25 minutes, a is between 45 and 50 ℃.
5. The control method according to claim 3, wherein if the duration of the air conditioner in the current high temperature prevention state exceeds a time threshold T3 and the temperature of the coil in the air conditioner exceeds a temperature threshold a, controlling the air conditioner to defrost comprises:
and judging whether the high-temperature prevention period is prolonged or not to control the air conditioner to perform defrosting when the air conditioner cannot exit the high-temperature prevention state again, wherein the high-temperature prevention period is the time difference between the time when the air conditioner enters the high-temperature prevention state and the time when the air conditioner exits the high-temperature prevention state.
6. The control method according to claim 5, wherein the judging whether the high temperature prevention period becomes long includes:
if Δ tk+1＞ΔtkJudging that the high temperature resistant period is prolonged;
wherein, Δ tk+1＝tn+2-tn+1For this exit of the time difference of the high temperature resistant state, Δ tk＝tn+1-tnFor the previous exit of the time difference of the high temperature prevention state, wherein, tnIs the nth high temperature protection cycle end time, tn+1Is the n +1 th high temperature resistant cycle end time, tn+2The end time of the (n + 2) th high temperature prevention period.
7. A control device for defrosting of an air conditioner is characterized by comprising:
the determining unit is used for determining the duration time of the air conditioner in the high-temperature prevention state and the temperature of a coil pipe in the air conditioner;
and the control unit is used for controlling the air conditioner to defrost according to the duration time of the high-temperature prevention state of the air conditioner and the temperature of the coil pipe in the air conditioner.
8. The control device of claim 7, wherein the control unit is configured to control the air conditioner to defrost when the air conditioner is in the current high temperature prevention state for a time period exceeding a time threshold T3 and the temperature of the coil in the air conditioner exceeds a temperature threshold a.
9. The control device of claim 8, wherein the control unit is further configured to determine whether the high temperature prevention period is lengthened to determine that the air conditioner cannot exit the high temperature prevention again, and control the air conditioner to perform defrosting.
10. An air conditioner characterized by comprising the control device according to any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010616179.9A CN111692709B (en) | 2019-04-03 | 2019-04-03 | Air conditioner defrosting control method and device and air conditioner |
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| CN202010616179.9A CN111692709B (en) | 2019-04-03 | 2019-04-03 | Air conditioner defrosting control method and device and air conditioner |
| CN201910268396.0A CN110081558B (en) | 2019-04-03 | 2019-04-03 | Air conditioner defrosting control method and device and air conditioner |
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| CN201910268396.0A Division CN110081558B (en) | 2019-04-03 | 2019-04-03 | Air conditioner defrosting control method and device and air conditioner |
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| CN111692709A true CN111692709A (en) | 2020-09-22 |
| CN111692709B CN111692709B (en) | 2021-10-15 |
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| CN112902386A (en) * | 2021-02-05 | 2021-06-04 | 宁波奥克斯电气股份有限公司 | Control method and system for high-temperature protection of air conditioner and air conditioner |
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| Publication number | Publication date |
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| CN110081558A (en) | 2019-08-02 |
| CN111692709B (en) | 2021-10-15 |
| CN110081558B (en) | 2020-07-31 |
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