CN110736219B - Anti-freezing control method for indoor unit of air conditioner - Google Patents
Anti-freezing control method for indoor unit of air conditioner Download PDFInfo
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- CN110736219B CN110736219B CN201910893597.XA CN201910893597A CN110736219B CN 110736219 B CN110736219 B CN 110736219B CN 201910893597 A CN201910893597 A CN 201910893597A CN 110736219 B CN110736219 B CN 110736219B
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- 238000007710 freezing Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005057 refrigeration Methods 0.000 claims abstract description 9
- 239000003507 refrigerant Substances 0.000 claims description 10
- 230000008014 freezing Effects 0.000 abstract description 38
- 230000002265 prevention Effects 0.000 description 11
- 206010060904 Freezing phenomenon Diseases 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010257 thawing Methods 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
- 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
- F24F11/43—Defrosting; Preventing freezing of indoor 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F2110/30—Velocity
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Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to an anti-freezing control method for an indoor unit of an air conditioner. The invention aims to solve the problem of low accuracy of the mode of judging the freezing condition of the indoor unit of the existing air conditioner. Therefore, the anti-freezing control method of the indoor unit comprises the following steps: under the condition that the air conditioner is in a refrigeration working condition, judging whether the air conditioner enters an indoor unit anti-freezing mode or not according to the attenuation degree of the complete machine power average value in the second time period relative to the complete machine power average value in the first time period and the attenuation degree of the complete machine current at the second preset time in the second time period relative to the complete machine current at the first preset time in the first time period; the first time period is located before the second time period, so that the influence of various irrelevant factors on the accuracy of the judgment result is effectively reduced, the judgment accuracy is effectively improved, and the air conditioner can be effectively ensured to rapidly and accurately enter the anti-freezing mode of the indoor unit.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an anti-freezing control method for an indoor unit of an air conditioner.
Background
Along with the continuous improvement of living standard of people, people also put forward higher and higher requirements on living environment. In order to maintain a comfortable ambient temperature, an air conditioner has become an indispensable equipment in human life. Generally, an air conditioner includes an indoor unit, an outdoor unit, and a circulation loop for connecting the indoor unit and the outdoor unit, and a heat exchange medium in the air conditioner continuously exchanges heat between the outdoor unit and the indoor unit through the circulation loop, so as to achieve an effect of changing a room temperature. Taking the air conditioner in refrigeration operation as an example, a coil pipe of the indoor unit is always in a low temperature state; at this moment, if the indoor environment has higher humidity, the coil pipe of the indoor unit is easy to freeze, and the generation of the freezing phenomenon can seriously affect the heat exchange efficiency of the indoor unit, so that the heat exchange effect of the air conditioner is continuously weakened, and the comfort level of the indoor environment is further affected. Therefore, when the air conditioner is in a cooling operation, the air conditioner needs to ensure that the coil of the indoor unit is not frozen.
In order to monitor the freezing phenomenon of the indoor unit coil, most of the existing air conditioners are provided with temperature sensors on the coil of the indoor unit, so that the air conditioners can judge the freezing condition of the indoor unit coil through the temperature of the coil of the indoor unit, and the air conditioners can timely perform deicing treatment when the coil of the indoor unit freezes. However, the accuracy of the monitoring method needs to depend on the shunting condition of the heat exchanger, when the shunting condition of the heat exchanger of the indoor unit is not good, if the shunting path provided with the temperature sensor is just short of freezing, and other shunting paths are frozen, the air conditioner cannot timely detect that the coil pipe of the indoor unit is frozen, and the coil pipe of the indoor unit cannot be timely deiced, so that the heat exchange efficiency of the air conditioner is seriously affected due to the occurrence of the condition, and the user experience is reduced. In addition, the current value of the air supply fan of the indoor unit is also used in some conventional air conditioners to determine the freezing condition of the indoor unit, but the current value of the air supply fan is actually easily affected by other factors, such as the degree of cleanliness of the indoor unit and the failure of the electrical components inside the air supply fan. In other words, when the indoor unit is dirty or some faults occur in the air supply fan, the current value of the air supply fan is reduced, so that it is difficult to accurately judge whether the indoor unit is frozen or not according to the current value of the air supply fan.
Accordingly, there is a need in the art for a new control method for preventing freezing of an indoor unit of an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the accuracy of the method for determining the indoor unit freezing condition of the existing air conditioner is low, the present invention provides an indoor unit anti-freezing control method for an air conditioner, wherein the indoor unit anti-freezing control method comprises: under the condition that the air conditioner is in a refrigeration working condition, acquiring a complete machine power average value in a first time period, complete machine current at a first preset moment in the first time period, a complete machine power average value in a second time period and complete machine current at a second preset moment in the second time period; calculating the attenuation degree of the overall power average value in the second time period relative to the overall power average value in the first time period; calculating the attenuation degree of the complete machine current at a second preset time in the second time period relative to the complete machine current at a first preset time in the first time period; judging whether the air conditioner enters an indoor unit anti-freezing mode or not according to the attenuation degree of the complete machine power average value in the second time period relative to the complete machine power average value in the first time period and the attenuation degree of the complete machine current at a second preset time in the second time period relative to the complete machine current at a first preset time in the first time period; wherein the first time period precedes the second time period.
In a preferred embodiment of the above method for controlling freezing prevention of an indoor unit of an air conditioner, the step of "calculating a degree of attenuation of the average value of the total power in the second time period with respect to the average value of the total power in the first time period" specifically includes: calculating the ratio of the average value of the complete machine power in the second time period to the average value of the complete machine power in the first time period, and recording the ratio as a first ratio; the step of "calculating the attenuation degree of the complete machine current at the second preset time in the second time period relative to the complete machine current at the first preset time in the first time period" specifically includes: calculating the ratio of the complete machine current at a second preset moment in the second time period to the complete machine current at a first preset moment in the first time period, and recording the ratio as a second ratio; the step of "determining whether to cause the air conditioner to enter an indoor unit anti-freezing mode according to the degree of attenuation of the overall power average value in the second time period relative to the overall power average value in the first time period and the degree of attenuation of the overall current at a second preset time in the second time period relative to the overall current at a first preset time in the first time period" specifically includes: comparing the first ratio and the second ratio with a first preset ratio and a second preset ratio respectively; and judging whether the air conditioner enters an indoor unit anti-freezing mode or not according to the comparison result of the first ratio and the first preset ratio and the comparison result of the second ratio and the second preset ratio.
In the above preferred technical solution of the method for controlling freezing prevention of an indoor unit of an air conditioner, "determining whether to enter an indoor unit freezing prevention mode according to a comparison result between the first ratio and the first preset ratio and a comparison result between the second ratio and the second preset ratio" includes: if the first ratio is smaller than the first preset ratio and the second ratio is smaller than the second preset ratio, acquiring the wind speed at the air outlet of the indoor unit; and judging whether the air conditioner enters an indoor unit anti-freezing mode or not according to the air speed at the air outlet of the indoor unit.
In the above preferred technical solution of the control method for preventing freezing of an indoor unit of an air conditioner, "determining whether to enter an indoor unit freezing prevention mode according to a wind speed at an air outlet of the indoor unit" specifically includes: if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is smaller than a third preset ratio, enabling the air conditioner to enter an indoor unit anti-freezing mode; and if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is not less than the third preset ratio, the air conditioner is not enabled to enter an anti-freezing mode of the indoor unit.
In a preferred technical solution of the above-mentioned method for controlling freezing prevention of an indoor unit of an air conditioner, "entering an indoor unit freezing prevention mode" includes: and stopping the circulation of the refrigerant in the air conditioner, and enabling an air supply fan of the indoor unit to operate at a preset rotating speed.
In the above preferred technical solution of the method for controlling anti-freezing of an indoor unit of an air conditioner, "determining whether to enter an indoor unit anti-freezing mode according to a comparison result between the first ratio and the first preset ratio and a comparison result between the second ratio and the second preset ratio" further includes: and if the first ratio is not smaller than the first preset ratio and/or the second ratio is not smaller than the second preset ratio, the air conditioner is not enabled to enter an indoor unit anti-freezing mode.
In a preferable technical solution of the above anti-freezing control method for an indoor unit of an air conditioner, the first time period and/or the second time period is/are an arbitrary value between 5s and 15s, and/or the first preset ratio and/or the second preset ratio is/are an arbitrary value between 0.85 and 0.95.
In a preferred technical solution of the above-mentioned indoor unit anti-freezing control method for an air conditioner, after the air conditioner enters an indoor unit anti-freezing mode, the indoor unit anti-freezing control method further includes: acquiring the air speed at an air outlet of the indoor unit; and judging whether the air conditioner exits the anti-freezing mode of the indoor unit or not according to the air speed at the air outlet of the indoor unit.
In the above preferred technical solution of the control method for preventing freezing of an indoor unit of an air conditioner, "determining whether to make the air conditioner exit an anti-freezing mode of the indoor unit according to a wind speed at an air outlet of the indoor unit" specifically includes: if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is not less than a fourth preset ratio, enabling the air conditioner to exit from an anti-freezing mode of the indoor unit; and if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is smaller than the fourth preset ratio, the air conditioner is not caused to exit the anti-freezing mode of the indoor unit.
In a preferable technical solution of the above control method for preventing freezing of an indoor unit of an air conditioner, the third preset ratio and/or the fourth preset ratio is/are any value between 0.8 and 0.9.
As can be understood by those skilled in the art, in the technical solution of the present invention, the method for controlling freezing prevention of an indoor unit according to the present invention includes: under the condition that the air conditioner is in a refrigeration working condition, acquiring a complete machine power average value in a first time period, complete machine current at a first preset moment in the first time period, a complete machine power average value in a second time period and complete machine current at a second preset moment in the second time period; calculating the attenuation degree of the overall power average value in the second time period relative to the overall power average value in the first time period; calculating the attenuation degree of the complete machine current at a second preset time in the second time period relative to the complete machine current at a first preset time in the first time period; judging whether the air conditioner enters an indoor unit anti-freezing mode or not according to the attenuation degree of the complete machine power average value in the second time period relative to the complete machine power average value in the first time period and the attenuation degree of the complete machine current at a second preset time in the second time period relative to the complete machine current at a first preset time in the first time period; wherein the first time period precedes the second time period. Compared with the technical scheme that the freezing condition of the indoor unit is judged only through the coil temperature of the indoor unit in the prior art, the freezing condition of the indoor unit is judged through the current of the whole unit of the air conditioner and the average value of the power of the whole unit of the air conditioner, so that the problem that the freezing condition of the indoor unit is easily influenced by other irrelevant factors to cause misjudgment when the existing air conditioner judges the freezing condition of the indoor unit only through the temperature of the inner coil is effectively solved, the judgment accuracy of the air conditioner is effectively improved, and the air conditioner is effectively ensured to be capable of accurately judging the freezing condition of the indoor unit. Compared with the technical scheme of judging the freezing condition of the indoor unit through the fan current in the prior art, the method has the advantages that the fan current is easily influenced by a plurality of factors, and the current fluctuates greatly once influenced, so that after the problem is found, the method specially analyzes various current data and power data of the air conditioner, and selects the current and power average value of the whole air conditioner as basic parameters, so that the judgment accuracy is effectively improved. Specifically, when the indoor unit freezes, the coil pipe of the indoor unit is covered by ice, so that the heat exchange capacity of the indoor coil pipe is reduced rapidly, and the temperature of the outdoor coil pipe is reduced along with the reduction of the heat absorption of the indoor coil pipe from the indoor side, so that the temperature of a refrigerant in the whole air conditioner is reduced, and the current and the power of a compressor are reduced along with the reduction of the temperature of the refrigerant in the whole air conditioner; in order to comprehensively consider the change of the operating parameters of each component when the indoor unit freezes, the average value of the current and the power of the whole unit is used as a basic parameter, so that the influence of various irrelevant factors on the accuracy of a judgment result is effectively reduced, and the accuracy of judgment is further effectively improved. In addition, the invention judges the freezing condition of the indoor unit by the attenuation degree of the current of the whole machine and the attenuation degree of the average value of the power of the whole machine twice, thereby further improving the accuracy rate of judgment; in other words, even if the power of the whole air conditioner fluctuates accidentally in the measuring process, the average value of the power of the whole air conditioner cannot be greatly influenced, so that the problem that the air conditioner is misjudged due to the fluctuation phenomenon of the power of the whole air conditioner is effectively avoided, and the problem that the refrigerating effect of the air conditioner is influenced due to the fact that the air conditioner frequently enters an indoor unit anti-freezing mode due to misjudgment is effectively avoided.
Further, in a preferred technical scheme of the present invention, the present invention adopts a ratio of the total power average value in the second time period to the total power average value in the first time period and a ratio of the total current at the second preset time in the second time period to the total current at the first preset time in the first time period to represent the attenuation degree, so as to better reflect the ratio of the variation rather than the direct variation of the numerical value, so that the determination result is not easily affected by the size of the base number, and further the accuracy of the determination is effectively ensured.
Further, in a preferred technical solution of the present invention, if the first ratio is smaller than the first preset ratio and the second ratio is smaller than the second preset ratio, it indicates that the indoor unit may have a freezing phenomenon, and in order to further ensure the accuracy of the determination result, the present invention can further determine whether to make the air conditioner enter an indoor unit anti-freezing mode according to the wind speed at the air outlet of the indoor unit; it can be understood that when the indoor unit freezes, the wind speed at the air outlet of the indoor unit is also affected by the ice seal and becomes smaller, so that the wind speed at the air outlet of the indoor unit can be comprehensively considered to participate in the judgment, the accuracy of the judgment result is ensured to the maximum extent, and the air conditioner can be effectively ensured to enter the anti-freezing mode of the indoor unit in time. Preferably, the first time period and/or the second time period is/are any value between 5s and 15s, and/or the first preset ratio and/or the second preset ratio is/are any value between 0.85 and 0.95.
Further, in a preferred technical solution of the present invention, if a ratio of the wind speed at the air outlet of the indoor unit to the preset wind speed is smaller than the third preset ratio, it indicates that the indoor unit should have been frozen, and in this case, the air conditioner enters an indoor unit anti-freezing mode; if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is not smaller than the third preset ratio, it is indicated that the indoor unit is not frozen actually, and in this case, the air conditioner is not enabled to enter an indoor unit anti-freezing mode, so that the refrigerating effect of the air conditioner is effectively ensured. Preferably, said third predetermined ratio is any value between 0.8 and 0.9.
Further, in a preferred embodiment of the present invention, the step of causing the air conditioner to enter an indoor unit anti-freezing mode specifically includes: and stopping the circulation of the refrigerant in the air conditioner, and enabling an air supply fan of the indoor unit to operate at a preset rotating speed. It can be understood that, generally, when the air conditioner is in a cooling condition, the indoor temperature must be higher, and at this time, the freezing condition of the indoor unit can be effectively alleviated as long as the refrigerant in the air conditioner stops circulating and the air supply fan of the indoor unit operates at the preset rotating speed, and in this case, the air blown out by the indoor unit is blown out after heat exchange with ice, and thus is still cool; in other words, the mode of relieving freezing without causing refrigerant to flow reversely not only can effectively save energy, but also can effectively ensure that the indoor unit still blows cool air.
Further, in a preferred technical solution of the present invention, after the air conditioner enters the indoor unit anti-freezing mode, the indoor unit anti-freezing control method further includes: and judging whether the air conditioner exits the anti-freezing mode of the indoor unit or not according to the air speed at the air outlet of the indoor unit. It can be understood that it is relatively easy to perform a process of de-freezing the indoor unit, compared to a process of defrosting the outdoor unit, i.e. the freezing phenomenon of the indoor unit can be eliminated after a short time of operation in the anti-freezing mode; therefore, the invention judges whether the air conditioner exits the anti-freezing mode of the indoor unit only by the wind speed at the air outlet of the indoor unit, so that the control logic of the air conditioner can be effectively simplified under the condition that the air conditioner can timely exit the anti-freezing mode of the indoor unit. Specifically, if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is not less than the fourth preset ratio, it indicates that the freezing condition of the indoor unit has been relieved, and in this case, the air conditioner exits the anti-freezing mode of the indoor unit, so as to better ensure the refrigeration effect of the indoor unit; if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is smaller than the fourth preset ratio, the freezing condition of the indoor unit is not well relieved, and under the condition, the air conditioner does not exit the anti-freezing mode of the indoor unit, so that the freezing condition of the indoor unit is effectively relieved, and the heat exchange efficiency of the air conditioner is better ensured. Preferably, said fourth predetermined ratio is any value between 0.8 and 0.9.
Drawings
FIG. 1 is a flow chart of the main steps of the control method for preventing the indoor unit from freezing according to the present invention;
fig. 2 is a flowchart illustrating specific steps of an indoor unit freezing prevention control method according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. 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.
Specifically, the air conditioner comprises an indoor unit, an outdoor unit and a refrigerant circulation loop arranged between the indoor unit and the outdoor unit, wherein an air outlet is formed in the indoor unit, an air supply fan is arranged near the air outlet, and an air speed detection device is arranged at the air outlet and can detect the air speed at the air outlet. It should be noted that, the invention does not limit the specific structure of the wind speed detection device, as long as the wind speed detection device can detect the wind speed at the air outlet; meanwhile, the invention does not limit the specific structure of the air conditioner at all, and technicians can set the specific internal structure of the air conditioner according to actual use requirements. In addition, the air conditioner is provided with an indoor unit anti-freezing mode, and the air conditioner can relieve the freezing condition in the indoor unit by operating the indoor unit anti-freezing mode; of course, the present invention does not limit any specific control manner when the air conditioner operates in the anti-freezing mode of the indoor unit, and a technician can set the control manner according to actual use requirements, for example, when the air conditioner operates in the anti-freezing mode of the indoor unit, the refrigerant in the air conditioner is controlled to stop circulating, and the air supply fan of the indoor unit is controlled to operate at a preset rotation speed.
Further, the air conditioner further comprises a controller, the controller can detect the wind speed at the air outlet through the wind speed detection device, and the controller can also control the operation of the air conditioner, for example, control the air conditioner to enter or exit an indoor unit anti-freezing mode. In addition, as can be understood by those skilled in the art, the present invention does not limit the specific structure and model of the controller, and the controller may be an original controller of the air conditioner, or may be a controller separately provided for executing the anti-freezing control method of the indoor unit of the present invention, and a technician may set the structure and model of the controller according to actual use requirements.
Referring to fig. 1, the method for controlling freezing prevention of an indoor unit according to the present invention is mainly illustrated in a flowchart. As shown in fig. 1, based on the air conditioner in the foregoing preferred embodiment, when the air conditioner is in a cooling condition, the method for controlling freezing prevention of the indoor unit mainly includes the following steps:
s1: acquiring a complete machine power average value in a first time period, complete machine current at a first preset moment in the first time period, a complete machine power average value in a second time period and complete machine current at a second preset moment in the second time period;
s2: calculating the attenuation degree of the overall power average value in the second time period relative to the overall power average value in the first time period;
s3: calculating the attenuation degree of the complete machine current at a second preset time in a second time period relative to the complete machine current at a first preset time in a first time period;
s4: and judging whether the air conditioner enters an indoor unit anti-freezing mode or not according to the attenuation degree of the complete machine power average value in the second time period relative to the complete machine power average value in the first time period and the attenuation degree of the complete machine current at the second preset time in the second time period relative to the complete machine current at the first preset time in the first time period.
Further, in step S1, the controller may obtain an average value of the complete machine power in a first time period and a complete machine current at a first preset time in the first time period, and obtain an average value of the complete machine power in a second time period and a complete machine current at a second preset time in the second time period, where the first time period is before the second time period. Generally, a current sensor is directly arranged at a power terminal of an electric control box body of the air conditioner to measure the whole machine current of the air conditioner, and the controller can calculate the whole machine power of the air conditioner according to the obtained whole machine current and the power voltage of the air conditioner; of course, the manner of obtaining the current and the power of the whole machine is not restrictive, and technicians can set the manner of obtaining the current and the power of the whole machine according to actual use requirements.
Further, in step S2, the controller may calculate a degree of attenuation of the average value of the total power in the second time period with respect to the average value of the total power in the first time period; in step S3, the controller may calculate a degree of attenuation of the complete machine current at a second preset time in the second time period with respect to the complete machine current at a first preset time in the first time period. It should be noted that the skilled person can select a specific value representing the attenuation degree by himself, for example, selecting a difference or a ratio of the two. In addition, the present invention does not limit the execution sequence of steps S2 and S3, the controller may execute step S2 first and then step S3, or execute step S2 and step S3 simultaneously, and the specific execution sequence may be changed without departing from the basic principle of the present invention, and the present invention falls into the protection scope of the present invention.
Further, in step S4, the controller may determine whether to cause the air conditioner to enter an indoor unit freeze prevention mode according to a degree of attenuation of the average value of the complete machine power in the second time period with respect to the average value of the complete machine power in the first time period and a degree of attenuation of the complete machine current at a second preset time in the second time period with respect to the complete machine current at a first preset time in the first time period. It should be noted that, the present invention does not limit the specific determination method, and a technician may set the specific determination method according to actual use requirements, and it belongs to the protection scope of the present invention as long as the method adopts the attenuation degree of the total power average value in the second time period relative to the total power average value in the first time period and the attenuation degree of the total current at the second preset time in the second time period relative to the total current at the first preset time in the first time period as parameters.
Referring to fig. 2, the method for controlling the indoor unit to prevent freezing according to the present invention is illustrated in a flowchart. As shown in fig. 2, based on the air conditioner in the foregoing preferred embodiment, when the air conditioner is in a cooling condition, the indoor unit anti-freezing control method specifically includes the following steps:
s101: acquiring a complete machine power average value in a first time period, complete machine current at a first preset moment in the first time period, a complete machine power average value in a second time period and complete machine current at a second preset moment in the second time period;
s102: calculating the ratio of the average value of the complete machine power in the second time period to the average value of the complete machine power in the first time period, and recording the ratio as a first ratio;
s103: calculating the ratio of the complete machine current at a second preset moment in a second time period to the complete machine current at a first preset moment in a first time period and recording the ratio as a second ratio;
s104: judging whether the first ratio is smaller than a first preset ratio and whether the second ratio is smaller than a second preset ratio; if yes, executing step S105; if not, executing step S101;
s105: acquiring the air speed at an air outlet of an indoor unit;
s106: judging whether the ratio of the wind speed of the air outlet to the preset wind speed is smaller than a third preset ratio or not; if yes, go to step S107; if not, executing step S101;
s107: the air conditioner enters an indoor unit anti-freezing mode;
s108: acquiring the wind speed at the air outlet of the indoor unit again;
s109: judging whether the ratio of the wind speed of the wind outlet to the preset wind speed is not less than a fourth preset ratio or not; if yes, go to step S110; if not, executing step S108;
s110: and enabling the air conditioner to exit the anti-freezing mode of the indoor unit.
Further, in step S101, the controller may obtain a total power average value in a first time period and a total current at a first preset time in the first time period, and obtain a total power average value in a second time period and a total current at a second preset time in the second time period, where the first time period is before the second time period. As a preferred embodiment, the first time period is connected to the second time period, that is, the first time period and the second time period are two adjacent time periods, so as to effectively prevent data omission, and thus effectively ensure the accuracy of the judgment result; the first preset time is the last moment of the first time period, and the second preset time is the last moment of the second time period. In addition, multiple tests show that the accuracy of the judgment result can be effectively improved by setting the first time period and the second time period to be any value between 5s and 15 s; of course, the technician may set the lengths of the first time period and the second time period according to the actual use requirement. The technical personnel in the field can understand that the technical personnel can set the measuring mode of the power average value of the whole machine according to the actual situation; for example, in the first time period, the total power is obtained once every preset time, and then the average value of the total power is obtained, and the average value is used as the average value of the total power in the first time period.
Further, in step S102, the controller can calculate a ratio of the average value of the complete machine power in the second time period to the average value of the complete machine power in the first time period, and record the ratio as a first ratio; in step S103, the controller can calculate a ratio of the complete machine current at a second preset time in the second time period to the complete machine current at a first preset time in the first time period, and record the ratio as the second ratio. It should be noted that, although the ratio of the two is used to represent the attenuation degree in the preferred embodiment, it is obvious to the skilled person that other values can be selected to represent the attenuation degree, for example, the difference between the two is used. In addition, the present invention does not limit the execution sequence of step S102 and step S103, the controller may execute step S102 and then step S103, or execute step S102 and step S103 simultaneously, and the specific execution sequence may be changed without departing from the basic principle of the present invention, and the present invention falls into the protection scope of the present invention.
Further, in step S104, the controller can determine whether the first ratio is smaller than the first preset ratio and whether the second ratio is smaller than the second preset ratio, so as to perform different steps. Specifically, if the controller determines that the first ratio is smaller than the first preset ratio and the second ratio is smaller than the second preset ratio, it indicates that the indoor unit may have a freezing phenomenon, and in order to further ensure the accuracy of the determination result, step S105 is performed, that is, the controller can obtain the wind speed at the air outlet of the indoor unit through the wind speed detection device, so as to further determine the freezing condition of the indoor unit according to the wind speed at the air outlet. If the controller judges that at least one condition of the first ratio not smaller than the first preset ratio and the second ratio not smaller than the second preset ratio is satisfied, the indoor unit is not frozen, and in this case, the step S101 is executed again so as to monitor the freezing condition of the indoor unit in time. In addition, after multiple tests, the first preset ratio and the second preset ratio are any values between 0.85 and 0.95, so that the accuracy of a judgment result can be effectively improved; of course, the technician may set the first preset ratio and the second preset ratio according to the actual use requirement.
Further, in step S106, the controller determines whether a ratio of the wind speed at the air outlet of the indoor unit to the preset wind speed is smaller than the third preset ratio; it should be noted that a technician can set the third preset ratio according to actual use requirements, and preferably, the third preset ratio is any value between 0.8 and 0.9; technicians can also set the value of the preset wind speed according to actual use requirements, and preferably, the preset wind speed is the wind speed at the air outlet when the indoor unit is not frozen. Based on the determination result in step S106, if the controller determines that the ratio of the wind speed at the air outlet of the indoor unit to the preset wind speed is smaller than the third preset ratio, it indicates that the indoor unit has indeed frozen, and in this case, the controller can control the air conditioner to enter an indoor unit anti-freezing mode. The person skilled in the art can understand that the invention does not set any limit to the specific operation of the air conditioner after entering the indoor unit anti-freezing mode; preferably, after the air conditioner enters an indoor unit anti-freezing mode, the controller can control the refrigerant in the air conditioner to stop circulating, that is, the air conditioner does not perform heat exchange between the outdoor and indoor space any more; meanwhile, the controller can also control the air supply fan of the indoor unit to operate at a preset rotating speed so as to accelerate and relieve the freezing phenomenon of the indoor unit. Of course, the technician sets the preset rotation speed according to the actual use requirement, and preferably, the maximum rotation speed of the air supply fan is set. If the controller judges that the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is not smaller than the third preset ratio, the indoor unit is not frozen, the controller possibly makes a misjudgment, and under the situation, the step S101 is executed again so as to monitor the freezing condition of the indoor unit in time.
After the air conditioner enters the indoor unit anti-freezing mode, step S108 is executed, that is, the controller can obtain the air speed at the air outlet of the indoor unit again, so as to determine the time when the air conditioner exits the indoor unit anti-freezing mode. Next, in step S109, the controller may determine whether a ratio of the wind speed at the air outlet of the indoor unit to the preset wind speed is smaller than the fourth preset ratio; it should be noted that, a skilled person may set the fourth preset ratio according to actual use requirements, and preferably, the fourth preset ratio is any value between 0.8 and 0.9.
Further, based on the determination result in step S109, if the controller determines that the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is not less than the fourth preset ratio, it indicates that the freezing phenomenon of the indoor unit has been alleviated, and at this time, the controller can control the air conditioner to exit the anti-freezing mode of the indoor unit and continue to operate the refrigeration condition, so as to effectively ensure the refrigeration effect of the air conditioner. If the controller judges that the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is smaller than the fourth preset ratio, the freezing phenomenon of the indoor unit is not well relieved, and in this case, the step S108 is executed again so as to monitor whether the freezing condition of the indoor unit is relieved or not in time, and then the air conditioner can be recovered to the refrigeration working condition as soon as possible.
Finally, it should be noted that the above examples are all preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. When the present invention is actually used, a part of the steps may be added or deleted as needed or the order between the different steps may be changed by those skilled in the art. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
So far, the preferred embodiments of the present invention have been described in conjunction with the accompanying drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (7)
1. An indoor unit anti-freezing control method for an air conditioner is characterized by comprising the following steps:
under the condition that the air conditioner is in a refrigeration working condition, acquiring a complete machine power average value in a first time period, complete machine current at a first preset moment in the first time period, a complete machine power average value in a second time period and complete machine current at a second preset moment in the second time period;
calculating the attenuation degree of the overall power average value in the second time period relative to the overall power average value in the first time period;
calculating the attenuation degree of the complete machine current at a second preset time in the second time period relative to the complete machine current at a first preset time in the first time period;
judging whether the air conditioner enters an indoor unit anti-freezing mode or not according to the attenuation degree of the complete machine power average value in the second time period relative to the complete machine power average value in the first time period and the attenuation degree of the complete machine current at a second preset time in the second time period relative to the complete machine current at a first preset time in the first time period;
wherein the first time period precedes the second time period;
the step of "calculating the attenuation degree of the average value of the complete machine power in the second time period relative to the average value of the complete machine power in the first time period" specifically includes:
calculating the ratio of the average value of the complete machine power in the second time period to the average value of the complete machine power in the first time period, and recording the ratio as a first ratio;
the step of "calculating the attenuation degree of the complete machine current at the second preset time in the second time period relative to the complete machine current at the first preset time in the first time period" specifically includes:
calculating the ratio of the complete machine current at a second preset moment in the second time period to the complete machine current at a first preset moment in the first time period, and recording the ratio as a second ratio;
the step of "determining whether to cause the air conditioner to enter an indoor unit anti-freezing mode according to the degree of attenuation of the overall power average value in the second time period relative to the overall power average value in the first time period and the degree of attenuation of the overall current at a second preset time in the second time period relative to the overall current at a first preset time in the first time period" specifically includes:
comparing the first ratio and the second ratio with a first preset ratio and a second preset ratio respectively;
judging whether the air conditioner enters an indoor unit anti-freezing mode or not according to a comparison result of the first ratio and the first preset ratio and a comparison result of the second ratio and the second preset ratio;
after the air conditioner enters an indoor unit anti-freezing mode, the indoor unit anti-freezing control method further comprises the following steps:
acquiring the air speed at an air outlet of the indoor unit;
judging whether the air conditioner exits the anti-freezing mode of the indoor unit or not according to the air speed at the air outlet of the indoor unit;
the step of judging whether the air conditioner exits the anti-freezing mode of the indoor unit or not according to the air speed at the air outlet of the indoor unit specifically comprises the following steps of:
if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is not less than a fourth preset ratio, enabling the air conditioner to exit from the anti-freezing mode of the indoor unit;
and if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is smaller than the fourth preset ratio, the air conditioner is not caused to exit the anti-freezing mode of the indoor unit.
2. The indoor unit anti-freezing control method according to claim 1, wherein the step of determining whether to cause the air conditioner to enter an indoor unit anti-freezing mode according to the comparison result between the first ratio and the first preset ratio and the comparison result between the second ratio and the second preset ratio comprises:
if the first ratio is smaller than the first preset ratio and the second ratio is smaller than the second preset ratio, acquiring the wind speed at the air outlet of the indoor unit;
and judging whether the air conditioner enters an indoor unit anti-freezing mode or not according to the air speed at the air outlet of the indoor unit.
3. The indoor unit anti-freezing control method according to claim 2, wherein the step of determining whether to cause the air conditioner to enter an indoor unit anti-freezing mode according to the wind speed at the air outlet of the indoor unit specifically comprises:
if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is smaller than a third preset ratio, enabling the air conditioner to enter an indoor unit anti-freezing mode;
and if the ratio of the air speed at the air outlet of the indoor unit to the preset air speed is not less than the third preset ratio, the air conditioner is not enabled to enter an anti-freezing mode of the indoor unit.
4. The indoor unit anti-freezing control method according to claim 3, wherein the step of causing the air conditioner to enter the indoor unit anti-freezing mode specifically comprises:
and stopping the circulation of the refrigerant in the air conditioner, and enabling an air supply fan of the indoor unit to operate at a preset rotating speed.
5. The indoor unit anti-freezing control method according to claim 1, wherein the step of determining whether to cause the air conditioner to enter an indoor unit anti-freezing mode according to the comparison result between the first ratio and the first preset ratio and the comparison result between the second ratio and the second preset ratio further comprises:
and if the first ratio is not smaller than the first preset ratio and/or the second ratio is not smaller than the second preset ratio, the air conditioner is not enabled to enter an indoor unit anti-freezing mode.
6. The indoor unit anti-freezing control method according to any one of claims 1 to 5, wherein the first time period and/or the second time period is/are any value between 5s and 15s, and/or
The first preset ratio and/or the second preset ratio is/are any value between 0.85 and 0.95.
7. The indoor unit anti-freezing control method according to claim 3, wherein the third preset ratio and/or the fourth preset ratio is any value between 0.8 and 0.9.
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