CN111609520A - Control method of variable frequency air conditioner - Google Patents

Control method of variable frequency air conditioner Download PDF

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Publication number
CN111609520A
CN111609520A CN202010373238.4A CN202010373238A CN111609520A CN 111609520 A CN111609520 A CN 111609520A CN 202010373238 A CN202010373238 A CN 202010373238A CN 111609520 A CN111609520 A CN 111609520A
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CN
China
Prior art keywords
air conditioner
target frequency
time period
control method
inverter air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010373238.4A
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Chinese (zh)
Inventor
宋德跃
王海胜
张铭
孙猛猛
陈日帅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioning Electric Co Ltd
Priority to CN202010373238.4A priority Critical patent/CN111609520A/en
Publication of CN111609520A publication Critical patent/CN111609520A/en
Priority to PCT/CN2021/082104 priority patent/WO2021223530A1/en
Pending legal-status Critical Current

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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
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • 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
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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 relates to a control method of a variable frequency air conditioner. When the variable frequency air conditioner enters a stable operation state and operates at a first target frequency, under the condition that the outdoor temperature and the indoor temperature are kept unchanged, the control method controls the variable frequency air conditioner: operating at a first target frequency for a first time period; after a first period of time, operating at a second target frequency lower than the first target frequency for a second period of time, wherein the second period of time is shorter than or equal to the first period of time; and after a second time period has elapsed, repeating the steps of operating at the first target frequency for the first time period. The control method reduces the output power of the compressor by properly reducing the frequency of the compressor under the condition of not influencing the refrigerating or heating effect of the inverter air conditioner, thereby achieving the aim of saving energy. The control method also well embodies the concepts of environmental protection and energy conservation.

Description

Control method of variable frequency air conditioner
Technical Field
The invention relates to an air conditioning system, in particular to a control method of a variable frequency air conditioner.
Background
The inverter air conditioner generally refers to an air conditioning system using an inverter compressor. The inverter compressor can adjust the rotating speed of the inverter compressor by controlling the frequency of the inverter compressor, so that the refrigerating or heating capacity of the inverter air conditioner is changed. The variable frequency air conditioner applying the variable frequency control technology can also automatically select operation modes such as heating, refrigerating and the like according to the ambient temperature, so that the regulated space can quickly reach the target temperature in a short time, and small temperature difference fluctuation can be maintained in the regulated space after the target temperature is reached. Therefore, the variable frequency air conditioner can realize the effects of quick, energy-saving and comfortable temperature control, thereby being widely used.
Existing inverter air conditioners, including but not limited to single-cold inverter air conditioners and heat pump inverter air conditioners, may generally operate in a cooling or heating mode. When the inverter air conditioner reaches a stable operation state after being started, the inverter air conditioner generally controls the compressor to operate at a fixed and unchangeable frequency under the condition that indoor and outdoor working conditions are basically unchanged in order to obtain a continuous and good refrigerating or heating effect. The control method of the variable frequency air conditioner omits a condition that the energy consumption of the air conditioner can be reduced: under the condition that the indoor and outdoor working conditions are basically unchanged, the frequency of the compressor can be properly reduced while the same refrigerating or heating effect is maintained. Therefore, the existing control method of the inverter air conditioner does not well exert the advantages of the inverter air conditioner, has defects in energy saving and causes great energy waste.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, to solve the technical problem that the control method of the existing inverter air conditioner is not beneficial to energy saving, the present invention provides a control method of an inverter air conditioner, wherein when the inverter air conditioner enters a stable operation state and operates at a first target frequency, the control method controls the inverter air conditioner under the condition that an outdoor temperature and an indoor temperature are kept unchanged: operating at the first target frequency for a first time period; after the first time period has elapsed, operating at a second target frequency lower than the first target frequency for a second time period, the second time period being shorter than or equal to the first time period; and after the second time period has elapsed, repeating the steps of operating at the first target frequency for a first time period.
In a preferred technical solution of the control method of the inverter air conditioner, before entering the stable operation state, the control method controls the inverter air conditioner to start in a soft start mode at a predetermined start frequency, where the start frequency is lower than the first target frequency and the second target frequency.
In a preferred embodiment of the control method of the inverter air conditioner, the second target frequency may be linearly or non-linearly changed with respect to the first target frequency.
In a preferred technical solution of the control method of the inverter air conditioner, the second target frequency may be changed along with a change in a temperature of a coil of an indoor unit of the inverter air conditioner.
In a preferable embodiment of the method for controlling an inverter air conditioner, a ratio of the second target frequency to the first target frequency is varied within a range of 50% or more and less than 100%.
In a preferable embodiment of the method for controlling an inverter air conditioner, a ratio of the second target frequency to the first target frequency is 85%.
In a preferable embodiment of the method for controlling an inverter air conditioner, a ratio of the second time period to the first time period is variable.
In a preferable embodiment of the method for controlling an inverter air conditioner, a ratio of the second time period to the first time period is 1/4.
In a preferred technical solution of the control method of the inverter air conditioner, the second time period may vary with a temperature change of a coil of an indoor unit of the inverter air conditioner.
In a preferred technical scheme of the control method of the inverter air conditioner, one or more indoor units of the inverter air conditioner are provided.
As can be understood by those skilled in the art, in the technical solution of the control method of the inverter air conditioner of the present invention, after the inverter air conditioner enters the stable operation state, in case that both the indoor and outdoor temperatures are kept unchanged (herein, the "unchanged temperature" covers a small temperature variation range, such as ± 0.5 ℃), which does not cause a human body feeling difference, in order to save energy, the control method first controls the inverter air conditioner to operate at a first target frequency and last for a first time period. After the first time period, the control method controls the variable frequency air conditioner to operate at a second target frequency lower than the first target frequency and last for a second time period, wherein the second time period is shorter than or equal to the first time period. After the second time period, the control method controls the variable frequency air conditioner to repeat the steps of operating at the first target frequency and lasting for the first time period. The control method reduces the output power of the compressor by properly reducing the frequency of the compressor under the condition of not influencing the refrigerating or heating effect of the inverter air conditioner, thereby achieving the aim of saving energy.
Preferably, before the inverter air conditioner enters the stable operation state, the inverter air conditioner is controlled to perform a soft start, and the compressor is operated at a start frequency lower than the first target frequency and the second target frequency. The soft start mode can ensure the normal operation of the variable frequency air conditioner, and the fault caused by starting can not occur.
Preferably, the second target frequency is variable relative to the first target frequency and the second time period is variable relative to the first time period, for example, based on a change in coil temperature of an indoor unit of the variable frequency air conditioner, so as to maintain the indoor temperature constant (herein, the "temperature constant" covers a small temperature variation amplitude, for example ± 0.5 ℃), which does not cause a somatosensory difference of a human body.
Preferably, the indoor unit of the inverter air conditioner can be one or more. In the case that there are a plurality of indoor units, the control method of the inverter air conditioner of the present invention may be applied to each indoor unit.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a system diagram of an example inverter air conditioner incorporating a control method of the inverter air conditioner of the present invention;
FIG. 2 is a flow chart of a control method of the inverter air conditioner of the present invention;
FIG. 3 is a schematic view illustrating a frequency variation of a compressor when a related art inverter air conditioner is operated;
fig. 4 is a schematic view of a frequency variation of a compressor when an inverter air conditioner using the control method of the inverter air conditioner of the present invention is operated.
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.
In order to solve the technical problem, the invention provides a control method of an inverter air conditioner. The control method comprises the following steps: when the variable frequency air conditioner enters a stable operation state and operates at a first target frequency, under the condition that the outdoor temperature and the indoor temperature are kept unchanged, the control method controls the variable frequency air conditioner: operating at a first target frequency for a first time period; after the first time period, operating at a second target frequency lower than the first target frequency for a second time period shorter than or equal to the first time period; and after a second time period has elapsed, repeating the steps of operating at the first target frequency for the first time period. Under the condition that the indoor and outdoor temperatures are basically unchanged, the control method of the variable frequency air conditioner performs proper frequency reduction control on the frequency of the compressor under the condition that the refrigeration or heating effect of the whole air conditioning system is not influenced, not only exerts the advantages of the variable frequency air conditioner, but also can achieve the purpose of energy conservation.
The inverter air conditioner referred to herein includes, but is not limited to, a central air conditioner, a split type air conditioner, a window type air conditioner, etc. using an inverter compressor. Accordingly, the "indoor unit" includes, but is not limited to, the portion of a ceiling, wall, cabinet, or window air conditioner that protrudes into the room. Alternatively, the number of the indoor units may be one or more. In the case where there are a plurality of indoor units, the control method of the present invention is applied to each of the indoor units. The inverter air conditioner mentioned in the text can only have a refrigerating function, and can also have a refrigerating and heating function.
References herein to "temperature invariant" or "temperature remaining invariant" encompass small temperature fluctuations that do not result in somatosensory differences in humans, for example room temperature fluctuations within ± 0.5 ℃ or ± 1 ℃. The "outdoor temperature" referred to herein generally refers to the ambient temperature of the outdoor unit or the location of the outdoor unit of the inverter air conditioner. The "indoor temperature" referred to herein generally refers to the temperature of a space (e.g., a room) in which an indoor unit of the inverter air conditioner is located.
The "soft start" of the air conditioner referred to herein generally means that the compressor of the air conditioner is started at a preset reduced voltage/current/frequency, achieving smooth start of the motor and mechanical load of the compressor, and reducing impact of the starting current on the grid. Such a soft start may be implemented by a soft starter, for example.
Fig. 1 is a system diagram of an example inverter air conditioner incorporating a control method of the inverter air conditioner of the present invention. As shown in fig. 1, the inverter air conditioner 1 includes an inverter compressor 11, a four-way valve 12, a first heat exchanger 13, an electronic expansion valve 14, a second heat exchanger 15, and a gas-liquid separator 16. The inverter compressor 11, the four-way valve 12, the first heat exchanger 13, and the electronic expansion valve 14 are typically disposed in an outdoor unit or an outdoor unit of the inverter air conditioner, which is typically disposed in an outdoor environment, while the second heat exchanger 15 is typically disposed in an indoor unit, which is typically disposed in a room or a room. In one or more embodiments, first heat exchanger 13 and second heat exchanger 15 may include, but are not limited to, a finned coil heat exchanger and a plate heat exchanger, respectively. By means of the four-way valve 12, the inverter air conditioner 1 can perform a cooling and heating cycle. For example, as shown in fig. 1, in the refrigeration cycle, inside the four-way valve 12, the d-port and the c-port of the four-way valve 12 communicate, the e-port and the s-port communicate, and both the d-port and the c-port do not communicate with the e-port and the s-port. In contrast, in the heating cycle, after the four ports c, d, e, and s of the four-way valve 12 are switched, the d port and the e port are communicated, the c port and the s port are communicated, and the d port and the e port are not communicated with the c port and the s port.
In the refrigeration cycle, the first heat exchanger 13 functions as a condenser, and the second heat exchanger 15 functions as an evaporator. When the inverter air conditioner receives a cooling instruction, the inverter compressor 11 starts to start (for example, in a soft start mode), and a refrigerant (for example, R134a) that can circulate in a system of the inverter air conditioner is compressed by the inverter compressor 11 and then enters the first heat exchanger 13 (which serves as a condenser) through the d-port and the c-port of the four-way valve 12, which are communicated with each other, in the form of a high-temperature and high-pressure gas. In the first heat exchanger 13, the high-temperature and high-pressure gas refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant by transferring heat to the outside environment. The high-temperature and high-pressure liquid refrigerant is changed into a low-temperature and low-pressure liquid refrigerant by the throttling and pressure reducing action of the electronic expansion valve 14. The liquid refrigerant of low temperature and low pressure flows into the second heat exchanger 15 (which serves as an evaporator), and is evaporated into a gas refrigerant of low temperature and low pressure in the evaporator 15 by absorbing heat of the indoor air, which is thus cooled. The low-temperature low-pressure gas refrigerant passes through the e-port and the s-port of the four-way valve 12, which are communicated with each other, and enters the gas-liquid separator 16. The gas refrigerant after gas-liquid separation flows back to the inverter compressor 11. A complete refrigeration cycle is completed and such refrigeration cycle can be performed without interruption in order to achieve the target refrigeration temperature.
In the heating cycle, the first heat exchanger 13 functions as an evaporator, and the second heat exchanger 15 functions as a condenser. When the inverter air conditioner receives a heating instruction, the inverter compressor 11 starts to start (for example, in a soft start mode), and a refrigerant (for example, R134a) that may circulate in a system of the inverter air conditioner is compressed by the inverter compressor 11 and then enters the second heat exchanger 15 (which serves as a condenser) through the d-port and the e-port of the four-way valve 12, which are communicated with each other, in the form of a high-temperature and high-pressure gas. In the second heat exchanger 15, the high-temperature and high-pressure gas refrigerant is condensed into a high-temperature and high-pressure liquid refrigerant by transferring heat to the indoor air, and the indoor air is heated and warmed. The high-temperature and high-pressure liquid refrigerant is changed into a low-temperature and low-pressure liquid refrigerant by the throttling and pressure reducing action of the electronic expansion valve 14. The liquid refrigerant of low temperature and low pressure flows into the first heat exchanger 13 (which functions as an evaporator), and is evaporated into a gas refrigerant of low temperature and low pressure in the first heat exchanger 13 by absorbing heat of the outdoor environment. The low-temperature low-pressure gas refrigerant passes through the c-port and the s-port of the four-way valve 12, which are communicated with each other, and enters the gas-liquid separator 16. The gas refrigerant after gas-liquid separation flows back to the inverter compressor 11. A complete heating cycle is completed and such heating cycle may be performed without interruption in order to achieve the target heating temperature.
Fig. 2 is a flowchart of a control method of the inverter air conditioner of the present invention. As shown in fig. 2, the control method of the inverter air conditioner of the present invention includes steps S1, S2, and S3. For example, the inverter air conditioner described above enters the start-up stage after receiving the start-up command. In one or more embodiments, the inverter air conditioner adopts a soft start mode, namely, the inverter air conditioner is started at a lower start frequency. Such a start-up frequency is typically lower than the first target frequency and the second target frequency. After the start is completed, the inverter air conditioner usually enters a stable operation state. According to a target temperature preset by a user, the control method of the variable frequency air conditioner determines a first target frequency matched with the target temperature. If the outdoor ambient temperature and the target temperature remain unchanged, then the first target frequency will also typically remain unchanged. Therefore, the inverter air conditioner can be operated at the first target frequency after entering the stable operation state.
As shown in fig. 2, the control method of the present invention controls the inverter air conditioner to operate at the first target frequency for the first time period under the condition that both the outdoor temperature and the indoor temperature are constant at step S1. For example, the inverter air conditioner is operated at a first target frequency of 50Hz and lasts for a first period of 5 minutes. Then, the control method controls the inverter air conditioner to operate at a second target frequency lower than the first target frequency for a second period of time, wherein the second period of time is shorter than or equal to the first period of time (step S2). After the second time period elapses, the control method controls the inverter air conditioner to repeat the step of operating at the first target frequency for the first time period (step S3). And repeating the steps in sequence.
In one or more embodiments, the second target frequency is variable relative to the first target frequency, and the variation may be linear or non-linear. The specific change can be determined through experiments according to the actual variable frequency air conditioner and the operation condition thereof. In one or more embodiments, the ratio of the second target frequency to the first target frequency ranges between 50% or greater and less than 100%, such as 85%, 90%, or 95%. In one or more embodiments, the second target frequency can be changed along with the temperature change of a coil of the indoor unit of the variable frequency air conditioner (namely, a coil heat exchanger of the indoor unit). For example, when the first target frequency is 50Hz, the second target frequency is first determined to be 45 Hz. When the variable frequency air conditioner runs at 45Hz, the system of the variable frequency air conditioner monitors the temperature change of the coil pipe of the indoor unit. When the system monitors that the magnitude of the coil temperature increase (in the cooling mode) is about to exceed the predetermined range during a second time period, such as 5 minutes, the second target frequency may be increased by a small amount, such as 48Hz, to bring the coil temperature within the predetermined range (e.g., ± 0.5 ℃, or ± 0.6 ℃). This is because the temperature of the coil increases to cause the indoor temperature to increase, and the second target frequency is adjusted to be a little higher so as to control the indoor temperature to be constant or to have a small fluctuation range.
In one or more embodiments, the second time period is also variable. Optionally, the second time period may also be changed along with the change of the temperature of the coil of the indoor unit of the inverter air conditioner. For example, when the inverter air conditioner is operated at a predetermined second target frequency of 45Hz and is predetermined for 5 minutes, the control method may control the inverter air conditioner to stop operating at the second target frequency before reaching 5 minutes, but to return to operating at the first target frequency before the system of the inverter air conditioner monitors that the variation of the coil temperature of the indoor unit exceeds a predetermined range. Therefore, the coil temperature variation of the indoor unit can be controlled to be always within the predetermined range by controlling the length of the second time period, so as to maintain the indoor temperature to be constant or basically constant (for example, the fluctuation amplitude of +/-1 ℃ is not exceeded). In one or more embodiments, the second time period can be 1/6, 1/5, or 1/4 of the first time period. The second time period can also be determined through experiments according to the actual variable frequency air conditioner and the operation condition thereof.
In one or more embodiments, in order to control the amplitude of the variation of the coil temperature of the indoor unit, the control method of the present invention may adopt a measure of simultaneously changing the second target frequency and the second time period. For example, when the system of the inverter air conditioner monitors that the change of the temperature of the coil of the indoor unit tends to exceed the preset range, the second target frequency is increased a little, then the operation at the second target frequency is stopped before the change of the temperature of the coil exceeds the preset range, and the operation at the first target frequency is resumed.
Fig. 3 is a schematic view of a frequency variation of a compressor when an inverter air conditioner of the related art operates, and fig. 4 is a schematic view of a frequency variation of a compressor when an inverter air conditioner using a control method of an inverter air conditioner of the present invention operates. As shown in fig. 3, after receiving the start command, the control method of the prior art inverter air conditioner first controls the inverter air conditioner to start at a frequency fsStarting in a soft start mode, over a time t2-t1And then the start is finished. Then, the inverter air conditioner is boosted to the target frequency ftAnd enters a steady operation state. In the stable operation state, the inverter air conditioner maintains a fixed target frequency ftAnd is not changed. As shown in FIG. 4, the control method of the present invention also implements a soft start mode for the inverter air conditioner at the start stage, with a lower start frequency fsAnd (5) starting. However, after the inverter air conditioner enters a stable operation state, the control method of the present invention is obviously different from the control method of the prior art. Relay (S)Referring to fig. 4, under the condition that the indoor and outdoor temperatures are basically constant, the control method of the present invention first controls the variable frequency air conditioner at t32-t31At a first target frequency f during a first time periodt1And (5) operating. Then, at t33-t32At a frequency lower than the first target frequency f during a second time periodt1Of a second target frequency ft2(e.g., equal to 85% f)t1) And (5) operating. Here, the second time period t33-t32Significantly shorter than t32-t31For example, the former may be 1/4 of the latter. FIG. 4 shows the second time period t33-t32Inner second target frequency ft2Is left unchanged. Then, in an alternative embodiment, the second target frequency ft2At a second time period t33-t32Is internally variable. Over a second time period t33-t32Then, the inverter air conditioner resumes the first target frequency ft1Run for a time period t34-t33Wherein, t34-t33＝t33-t32. Then, during a time period t35-t34At a second target frequency ft2And (5) operating. By analogy, the control method of the invention can continuously repeat the steps. It is noted that the time period t35-t34May be different from the time period t33-t32I.e. the second period of time is variable, as described above. In addition, corresponding to the second time period t33-t32Of a second target frequency ft2Or may be different from the corresponding second time period t35-t34Of a second target frequency ft2I.e. the second target frequency is also variable. As shown in fig. 4, since the reduced frequency amplitude is not large, the current cooling or heating capacity of the inverter air conditioner can be basically maintained, and at the same time, the power of the compressor can be reduced, thereby reducing the energy consumption of the entire inverter air conditioner.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A control method of an inverter air conditioner is characterized in that when the inverter air conditioner enters a stable operation state and operates at a first target frequency, under the condition that the outdoor temperature and the indoor temperature are kept unchanged, the control method controls the inverter air conditioner to:
operating at the first target frequency for a first time period;
after the first time period has elapsed, operating at a second target frequency lower than the first target frequency for a second time period, wherein the second time period is shorter than or equal to the first time period; and is
After the second time period has elapsed, the steps of operating at the first target frequency for the first time period are repeated.
2. The control method of an inverter air conditioner according to claim 1, wherein the control method controls the inverter air conditioner to be started in a soft start mode at a predetermined start frequency, which is lower than the first and second target frequencies, before entering the stable operation state.
3. The method as claimed in claim 1 or 2, wherein the second target frequency is linearly or non-linearly variable with respect to the first target frequency.
4. The method as claimed in claim 3, wherein the second target frequency is variable with a temperature of a coil of an indoor unit of the inverter air conditioner.
5. The method of claim 3, wherein a ratio of the second target frequency to the first target frequency is varied within a range of 50% or more and 100% or less.
6. The method of claim 5, wherein a ratio of the second target frequency to the first target frequency is 85%.
7. The control method of an inverter air conditioner according to claim 1 or 2, wherein a ratio of the second period of time to the first period of time is variable.
8. The control method of an inverter air conditioner according to claim 7, wherein a ratio of the second time period to the first time period is 1/4.
9. The method as claimed in claim 7, wherein the second time period is variable with the temperature of the coil of the indoor unit of the inverter air conditioner.
10. The method for controlling the inverter air conditioner according to claim 1 or 2, wherein one or more indoor units of the inverter air conditioner are provided.
CN202010373238.4A 2020-05-06 2020-05-06 Control method of variable frequency air conditioner Pending CN111609520A (en)

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PCT/CN2021/082104 WO2021223530A1 (en) 2020-05-06 2021-03-22 Control method for inverter air conditioner

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WO2021223530A1 (en) * 2020-05-06 2021-11-11 青岛海尔空调电子有限公司 Control method for inverter air conditioner

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CN114704933B (en) * 2022-02-18 2023-12-19 青岛海尔空调器有限总公司 Method and device for controlling direct-current air conditioner and air conditioner

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