CN108444037B - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- CN108444037B CN108444037B CN201810152023.2A CN201810152023A CN108444037B CN 108444037 B CN108444037 B CN 108444037B CN 201810152023 A CN201810152023 A CN 201810152023A CN 108444037 B CN108444037 B CN 108444037B
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- 238000010257 thawing Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
本发明属于空调器技术领域，具体涉及一种空调器除霜控制方法。为了更准确地判断进入除霜的时机，本发明提出的空调器除霜控制方法包括：在空调器处于制热工况的情形下，每隔预设时间获取一次室外风机的电流平均值；比较室外风机的电流平均值与标准电流平均值；根据比较结果判断是否使空调器进入除霜模式；其中，标准电流平均值为空调器本次开始运行之后第一次获取的室外风机的电流平均值。由于室外风机的电流平均值能够更准确地反映室外风机的电流变化，因此可以有效地避免因单个电流值的突然变化而产生的误判断情形的出现，从而更合理地判断出室外盘管的结霜状态，进而使得本发明的能够更准确地选择除霜时机，提升用户体验。
The invention belongs to the technical field of air conditioners, and in particular relates to a defrosting control method for an air conditioner. In order to more accurately determine the timing of entering the defrosting, the air conditioner defrosting control method proposed by the present invention includes: when the air conditioner is in a heating condition, acquiring the current average value of the outdoor fan every preset time; comparing The average value of the current of the outdoor fan and the average value of the standard current; according to the comparison result, it is judged whether to put the air conditioner into the defrosting mode; among them, the average value of the standard current is the average value of the current of the outdoor fan obtained for the first time after the air conditioner starts to run. . Since the current average value of the outdoor fan can more accurately reflect the current change of the outdoor fan, it can effectively avoid the occurrence of misjudgment caused by the sudden change of a single current value, so as to more reasonably judge the structure of the outdoor coil. The frost state can be further selected by the present invention more accurately, and the user experience can be improved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method of an air conditioner.
Background
The air conditioner as a device capable of adjusting the indoor environment temperature has the working principle that: the indoor environment temperature is lowered or raised by the refrigerant switching between the circulation lines through the high pressure/low pressure/gas/liquid state, namely, the air conditioner is in the cooling or heating working condition from the perspective of the indoor unit. When the air conditioner heats the operation, if outdoor coil pipe temperature under certain humidity condition crosses lowly can lead to the frosting condition, and outdoor unit coil pipe frosting can lead to outdoor heat exchanger's heat exchange efficiency to reduce, influences the heating effect of air conditioner, reduces the travelling comfort of indoor environment, influences user experience. Therefore, in the situation that the air conditioner is in the heating working condition, the outdoor unit coil of the air conditioner needs to be defrosted timely and effectively.
The existing technical scheme is that the frosting degree of an outdoor coil is judged according to the humidity and the temperature of the outdoor coil, and then corresponding defrosting operation is carried out according to the frosting condition of the outdoor coil. However, this method of determining frosting requires that the accuracy of the outdoor coil sensor is very high, and is more accurate when the outdoor heat exchanger is well shunted, and once the outdoor heat exchanger is not shunted well, the outdoor coil sensor cannot accurately determine the evaporating temperature of each shunt (the outdoor coil sensor can only determine the evaporating temperature of one shunt). In this case, the following situation is liable to occur: the outdoor coil has frosted actually, but the temperature of the outdoor coil is high, so that the defrosting cannot be accurately controlled, and the condition that the frost is not dissolved or is not completely dissolved is caused. In view of this, it is important to select the proper defrost timing.
Therefore, the invention provides a novel defrosting control method.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, in order to more accurately judge the timing of entering the defrosting, the present invention provides a defrosting control method for an air conditioner, the defrosting control method comprising the following steps: under the condition that the air conditioner is in a heating working condition, acquiring the current average value of the outdoor fan at preset time intervals; comparing the current average value of the outdoor fan with a standard current average value; judging whether the air conditioner enters a defrosting mode or not according to the comparison result; and the standard current average value is the current average value of the outdoor fan acquired for the first time after the air conditioner starts to operate at this time.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, the step of "comparing the average value of the current of the outdoor fan with the standard average value of the current of the outdoor fan" includes: calculating the current average value In and the standard current average value I of the outdoor fan In the current period1Wherein n is an integer of 2 or more.
Preferred implementation of the defrosting control method for the air conditionerIn the mode, "judging whether to make the air conditioner enter the defrosting mode according to the comparison result" includes: if In/I1If the frequency is less than the preset value, the running frequency of the compressor is reduced, and then I is calculatedn+1/I1A value of (d); according to In+1/I1Judging whether the air conditioner enters a defrosting mode or not; wherein, In+1And the current average value of the outdoor fan in the next period of the current period is obtained.
In a preferred embodiment of the above-described air conditioner defrost control method, "according to In+1/I1The step of determining whether to put the air conditioner into the defrost mode "includes: if In+1/I1If the value of (b) is less than the preset value, enabling the air conditioner to enter a defrosting mode; otherwise, the air conditioner maintains the current heating working condition and does not enter a defrosting mode.
In a preferred embodiment of the above-described air conditioner defrosting control method, the step of "determining whether to enter the air conditioner into the defrosting mode based on the comparison result" includes: if In/I1If the frequency is less than the preset value, the running frequency of the compressor is reduced, and then I is calculatedn+1/I1、In+2/I1、In+3/I1A value of (d); if In+1/I1、In+2/I1、In+3/I1If at least two values of (a) are smaller than the preset value, the air conditioner is enabled to enter a defrosting mode; otherwise, the air conditioner maintains the current heating working condition and does not enter a defrosting mode; wherein, In+1The current average value of the outdoor fan in the next time period of the current time period is taken as the current average value; i isn+2The current average value of the outdoor fan in the next time period of the next time period is taken as the current average value; i isn+3And the current average value of the outdoor fan in the next time period of the next time period is obtained.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, the preset time is any time between 20s and 40 s.
In a preferred embodiment of the above defrosting control method of an air conditioner, the preset value is any value between 0.85 and 0.95.
In a preferred embodiment of the above defrosting control method of an air conditioner, the preset value is 0.9.
In a preferred embodiment of the above-mentioned defrosting control method for an air conditioner, the defrosting control method further includes a step of determining whether to exit the defrosting mode, the step including: after the air conditioner enters a defrosting mode, comparing the current average value of the outdoor fan in the current time period with the standard current average value; and judging whether the air conditioner exits the defrosting mode or not according to the comparison result.
In a preferred embodiment of the above-described air conditioner defrost control method, the step of determining whether to exit the defrost mode based on the comparison result includes: if the current average value of the outdoor fan in the current period is larger than or equal to the standard current average value, the defrosting mode is exited; otherwise, the air conditioner is maintained in the defrosting condition.
The invention judges the frosting degree of the outdoor coil according to the rule that the current of the outdoor fan changes along with the change of the frosting degree of the outdoor coil. Specifically, the current average value of the outdoor fan is compared with the standard current average value, the current frosting state of the outdoor coil can be accurately judged according to the comparison result, and the current average value of the outdoor fan can more accurately reflect the current change of the outdoor fan, so that the misjudgment situation caused by the sudden change of a single current value can be effectively avoided, the frosting state of the outdoor coil can be more reasonably judged, the defrosting time can be more accurately selected, the limitation of judging the frosting degree by adopting the temperature of the outdoor coil in the prior art is effectively eliminated, the defrosting times of the air conditioner are reduced, and the user experience is improved.
Drawings
FIG. 1 is a main flow chart of the defrosting control method of the air conditioner of the present invention;
FIG. 2 is a detailed flowchart of a first embodiment of the defrosting control method of the air conditioner according to the present invention;
fig. 3 is a detailed flowchart of a second embodiment of the defrosting control method of an air conditioner according to the present invention.
Detailed Description
In order to make the embodiments, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the embodiments are some, but not all embodiments of the present invention. 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. For example, although the steps of the method of the present invention are described herein in a particular order, these orders are not limiting, and one skilled in the art may perform the steps in a different order without departing from the underlying principles of the invention.
The frosting degree of outdoor coil pipe is mainly judged through outdoor coil pipe temperature in prior art, but as background art said, this kind of mode receives factors such as reposition of redundant personnel and sensor precision easily and influences for have certain limitation when adopting outdoor coil pipe temperature to judge frosting degree. The defrosting control method of the air conditioner provided by the invention aims to eliminate the limitation when the frosting degree is judged by adopting the temperature of the outdoor coil pipe and accurately judge the defrosting time.
Referring first to fig. 1, fig. 1 is a main flowchart of a defrosting control method of an air conditioner according to the present invention. As shown in fig. 1, the defrost control method of the present invention comprises the steps of: s110, acquiring the current average value of the outdoor fan every preset time under the condition that the air conditioner is in a heating working condition; s120, comparing the current average value of the outdoor fan with the standard current average value; and S130, judging whether the air conditioner enters a defrosting mode or not according to the comparison result. And the standard current average value is the current average value of the outdoor fan acquired for the first time.
Along with the frost degree of the outdoor coil pipe is larger and larger, the wind resistance is gradually increased, the air quantity entering the outdoor fan is correspondingly reduced, when the wind resistance is increased, the load of the outdoor fan is correspondingly increased, and the current of the outdoor fan is reduced accordingly. In other words, the load of the outdoor fan at a certain rotating speed is determined, and if the load of the motor increases and the current decreases at the same rotating speed, the fact that the air inlet quantity of the outdoor fan decreases and the frosting degree of the outdoor coil pipe increases is indicated. Therefore, the current of the outdoor fan changes correspondingly along with the frosting degree of the outdoor coil, and therefore the frosting degree of the outdoor coil can be judged according to the change rule of the current of the outdoor fan along with the change of the frosting degree of the outdoor coil, and the limitation of judging the frosting degree by independently adopting the outdoor coil temperature/the indoor coil temperature in the prior art can be further effectively eliminated. Thereby more accurately judging the defrosting time of the air conditioner. The above steps are described in further detail below.
In the defrosting control method of the air conditioner, the frosting degree of the outdoor coil pipe is judged by comparing the current average value of the outdoor fan with the standard current average value (the current average value of the outdoor fan obtained for the first time) according to the rule that the current of the outdoor fan changes along with the frosting degree of the outdoor coil pipe. Therefore, the proper time for the air conditioner to enter the defrosting mode can be accurately judged, and the defrosting effect of the air conditioner can be greatly improved on the basis of reducing the defrosting times. The current average value of the outdoor fan can more accurately reflect the current change of the outdoor fan, so that the occurrence of misjudgment caused by sudden change of a single current value can be effectively avoided, and the frosting state of the outdoor coil pipe can be more reasonably judged. The above steps are described in further detail below.
In the above step S110, the preset time may be 20S, 30S, 40S, or any time between 20S and 40S, and those skilled in the art may select other suitable preset times according to the actual application scenario without departing from the scope of the present invention. The average value of the outdoor fan current can be detected by any known means, and will not be described in detail herein.
In the step S120, the standard current average value is the current average value of the outdoor fan acquired for the first time. For example, if the average value of the current of the outdoor fan is obtained every 30s, when the air conditioner is turned on to operate in the heating mode, the average value of the current of the outdoor fan obtained in the first 30s is used as the standard average value of the current, and then the subsequently detected average value of the current of the outdoor fan is compared with the standard average value of the current. Specifically, the method for comparing the average current value of the outdoor fan with the standard average current value comprises the following steps: and calculating the ratio A of the current average value of the outdoor fan in the current time period to the standard current average value. That is, the real-time current value change of the outdoor fan is judged according to the ratio of the real-time current value change and the real-time current value change.
In the step S130, the step of determining whether to enter the air conditioner into the defrosting mode according to the comparison result includes: if the ratio A is smaller than the preset value, the running frequency of the compressor is reduced, then the ratio B of the current average value of the outdoor fan in the next time period to the standard current average value is calculated, if the value of B is smaller than the preset value, the air conditioner is enabled to enter a defrosting mode, otherwise, the air conditioner is enabled to maintain the current heating working condition and is not enabled to enter the defrosting mode.
In the step S130, the step of determining whether to enable the air conditioner to enter the defrosting mode according to the comparison result may further include: if the ratio A is smaller than a preset value, reducing the running frequency of the compressor, then respectively calculating the ratio C, D, E of the current average value and the standard current average value of the last three periods (namely the next period of the current period, the next period of the next period and the next period of the next period) of the current period of the outdoor fan, and if at least two values in the ratio C, D, E are smaller than the preset value, enabling the air conditioner to enter a defrosting mode; otherwise, the air conditioner is kept in the heating working condition and does not enter the defrosting mode. Wherein the preset value can be any value between 0.8 and 0.9.
In order to more clearly explain the defrosting control method of the present invention, the defrosting control method of the present invention will be described in detail with reference to a specific embodiment.
Referring to fig. 2, fig. 2 is a detailed flowchart of a first embodiment of the defrosting control method of the air conditioner according to the present invention. As shown in fig. 2, in the case that the air conditioner is in the heating condition, step S210 is first executed, and the average value I of the current of the outdoor fan is detected every 30Sn. Then, the mixture is fed to a reactorGo to step S220, judge In/I1Is less than 0.9 (preset value), wherein I1Obtaining the current average value of the outdoor fan in the first 30s when the air conditioner is started to operate in a heating mode; i isnIs the average value of the currents of the outdoor fans (n is an integer greater than 2) obtained sequentially from the second 30 s. If In/I1If the frequency is less than 0.9, the operation goes to step S230 to reduce the operation frequency of the compressor by 0.9; then, the process proceeds to step S240, and judgment In+1/I1Whether or not the value of (A) is less than 0.9, wherein In+1Is InThe current average value of the outdoor fan obtained in the next period. If In+1/I1If less than 0.9, the process proceeds to step S250, where the air conditioner is put into a defrost mode. In the defrosting control method, if In/I1A value of not less than 0.9, or In+1/I1If the value is not less than 0.9, the process goes to step S260, and the air conditioner maintains the heating condition.
Referring to fig. 3, fig. 3 is a detailed flowchart of a second embodiment of the defrosting control method of the air conditioner according to the present invention. As shown in fig. 3, in the case that the air conditioner is in the heating condition, step S310 is first executed to detect the average current value I of the outdoor fan every 30Sn. Then, the process proceeds to step S320, and judgment In/I1Is less than 0.9 (preset value), wherein I1Obtaining the current average value of the outdoor fan in the first 30s when the air conditioner is started to operate in a heating mode; i isnIs the average value of the currents of the outdoor fans (n is an integer greater than 2) obtained sequentially from the second 30 s. If In/I1If the frequency is less than 0.9, the operation goes to step S330, and the operation frequency of the compressor is reduced by 0.9; then, the process proceeds to step S340, and judgment In+1/I1、In+2/I1、In+3/I1Whether at least two of the values of (A) are less than 0.9, wherein In+1Is InThe current average value of the outdoor fan is obtained in the next period; i isn+2Is In+1The current average value of the outdoor fan is obtained in the next period; i isn+3Is In+2The current average value of the outdoor fan obtained in the next period. If it is the aboveIf at least two values are less than 0.9, the process proceeds to step S350, and the air conditioner enters the defrost mode. In the defrosting control method, if In/I1Is not less than 0.9, or I is not satisfiedn+1/I1、In+2/I1、In+3/I1If at least two values of (1) are less than 0.9, the process goes to step S360, and the air conditioner maintains the heating condition.
It should be noted that, the preset value in the foregoing is described by taking 0.9 as an example, and those skilled in the art may also set the preset value to 0.85, or any other reasonable value. Preferably, the skilled person can set the preset value to any value between 0.85 and 0.95 without departing from the scope of protection of the present invention.
The defrosting control method of the air conditioner further comprises the step of exiting the defrosting mode. Specifically, after the air conditioner enters a defrosting mode, comparing the current average value of the outdoor fan in the current time period with the standard current average value; if the current average value of the outdoor fan in the current period is larger than or equal to the standard current average value, the defrosting mode is exited; otherwise, the air conditioner maintains the defrosting condition. It is easily understood by those skilled in the art that the current value of the outdoor fan is gradually increased during the defrosting process, and when the current value of the outdoor fan is gradually increased to be equal to the standard current average value, it indicates that the frost on the outdoor coil has been removed, i.e. the defrosting mode can be exited.
In summary, the frosting degree of the outdoor coil pipe is judged according to the rule that the current of the outdoor fan changes along with the change of the frosting degree of the outdoor coil pipe. Specifically, the current average value of the outdoor fan is compared with the standard current average value, the current frosting state of the outdoor coil can be accurately judged according to the comparison result, and the current average value of the outdoor fan can more accurately reflect the current change of the outdoor fan, so that the misjudgment situation caused by the sudden change of a single current value can be effectively avoided, the frosting state of the outdoor coil can be more reasonably judged, the defrosting time can be more accurately selected, the limitation of judging the frosting degree by adopting the temperature of the outdoor coil in the prior art is effectively eliminated, the defrosting times of the air conditioner are reduced, and the user experience is improved.
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.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110715402A (en) * | 2019-09-04 | 2020-01-21 | 宁波奥克斯电气股份有限公司 | Control method for air conditioner to quit defrosting, storage medium, controller and air conditioner |
| CN110567098A (en) * | 2019-09-23 | 2019-12-13 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device, air conditioner and storage medium |
| CN110848886B (en) * | 2019-11-28 | 2022-04-15 | 广东美的制冷设备有限公司 | Air conditioner, defrosting method thereof and computer readable storage medium |
| CN111397139A (en) * | 2020-04-14 | 2020-07-10 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device, air conditioner and storage medium |
| CN111981640B (en) * | 2020-08-19 | 2022-05-10 | 宁波奥克斯电气股份有限公司 | A defrosting control method, device, air conditioner and storage medium |
| CN112032941A (en) * | 2020-08-25 | 2020-12-04 | 海信（山东）空调有限公司 | Control method of air conditioner |
| CN113124544B (en) * | 2021-04-20 | 2023-04-25 | 青岛海尔空调电子有限公司 | Air-conditioning unit and its defrosting control method |
| CN113606846A (en) * | 2021-08-16 | 2021-11-05 | 合肥美菱物联科技有限公司 | Defrosting control method for refrigerator |
| CN113847709B (en) * | 2021-11-01 | 2022-11-25 | 广东积微科技有限公司 | Outdoor unit defrosting control device and control method of air conditioner and air conditioner |
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| CN105222285B (en) * | 2015-11-03 | 2018-01-23 | 珠海格力电器股份有限公司 | Control system and control method for heating and frosting of air conditioner |
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| CN104807132A (en) * | 2014-01-23 | 2015-07-29 | 珠海格力电器股份有限公司 | Defrosting control method and device |
| CN103925675A (en) * | 2014-03-27 | 2014-07-16 | 广东美的制冷设备有限公司 | Air conditioner and judgment method and device for air conditioner in defrost mode |
| CN106288144A (en) * | 2016-07-26 | 2017-01-04 | 广东美的暖通设备有限公司 | Air-conditioner and Defrost method thereof |
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