WO2023071148A1 - Defrosting control method and apparatus for air conditioner, and air conditioner - Google Patents

Defrosting control method and apparatus for air conditioner, and air conditioner Download PDF

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Publication number
WO2023071148A1
WO2023071148A1 PCT/CN2022/093083 CN2022093083W WO2023071148A1 WO 2023071148 A1 WO2023071148 A1 WO 2023071148A1 CN 2022093083 W CN2022093083 W CN 2022093083W WO 2023071148 A1 WO2023071148 A1 WO 2023071148A1
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Prior art keywords
real
time
frequency
time frequency
air conditioner
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PCT/CN2022/093083
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French (fr)
Chinese (zh)
Inventor
杨坤
马韵华
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青岛海尔空调电子有限公司
青岛海尔空调器有限总公司
海尔智家股份有限公司
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Publication of WO2023071148A1 publication Critical patent/WO2023071148A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention belongs to the technical field of air conditioning, and in particular relates to air conditioner technology, and more specifically relates to an air conditioner defrosting control method, a control device and an air conditioner.
  • the outdoor heat exchanger is kept at low temperature for a long time. If the outdoor air temperature is low and the humidity is high, the water vapor in the air will condense into frost on the surface of the outdoor heat exchanger. After the outdoor heat exchanger is frosted, the heat exchange efficiency is reduced, which affects the indoor comfort and causes the energy efficiency of the air conditioner to decrease. Therefore, after the air conditioner is frosted, it needs to be defrosted in time, and the air conditioner is controlled to execute the defrosting mode, and the heating cycle is converted into a refrigeration cycle, and the purpose of removing frost is achieved by increasing the temperature of the outdoor heat exchanger.
  • the defrosting time of the air conditioner is relatively short, generally 3-5 minutes.
  • the compressor runs at a fixed frequency, and the electronic expansion valve works at a fixed opening until the defrosting process is exited when the defrosting exit conditions are met.
  • the compressor is usually controlled to run at a higher fixed frequency, while the electronic expansion valve is controlled to work at a larger fixed opening.
  • the defrosting time is short, and its power consumption accounts for a small proportion in the entire heating operation process of the air conditioner, so the problem of defrosting power consumption is not considered.
  • energy saving during the defrosting process and clean defrosting are important indicators to measure the performance of the air conditioner, which is crucial to improving the overall performance of the air conditioner. Therefore, it is urgent to optimize and adjust the defrosting control of the air conditioner.
  • the object of the present invention is to provide an air conditioner defrosting control method and control device, to achieve the purpose of controlling different operating states according to actual frosting conditions, and to improve the air conditioner defrosting control performance.
  • the air conditioner defrosting control method provided by the present invention is realized by the following technical solutions:
  • a defrosting control method for an air conditioner comprising:
  • the compressor and the expansion valve are respectively controlled according to the real-time frequency and the real-time opening degree.
  • the real-time frequency of the compressor is determined according to the relationship between the real-time change rate and the preset change rate threshold, which specifically includes:
  • the real-time frequency is the first real-time frequency, and the first real-time frequency is divided according to the preset initial frequency, real-time outdoor heat exchanger coil temperature, and preset exit. Determination of frost outer disk temperature threshold and first relationship;
  • the real-time frequency is the second real-time frequency, and the second real-time frequency is based on the preset initial frequency and the real-time outdoor heat exchanger coil temperature .
  • the preset exit defrosting outer disk temperature threshold and the second relationship are determined;
  • the second real-time frequency is greater than the first real-time frequency.
  • the first relationship is:
  • F1 F0-K1(T0-Tm)+C1;
  • F2 F0+K2(T0-Tm)+C2;
  • F1 is the first real-time frequency
  • F2 is the second real-time frequency
  • F0 is the preset initial frequency
  • T0 is the preset temperature threshold for exiting defrosting
  • Tm is the real-time outdoor heat exchange Coil temperature
  • K1, K2 are known coefficients
  • C1, C2 are known compensation values.
  • the real-time opening of the expansion valve is determined according to the real-time frequency, which specifically includes:
  • the real-time opening of the expansion valve is determined according to the real-time frequency and the known linear relationship between the frequency and the opening.
  • the method also includes:
  • the air conditioner is controlled to enter the defrosting mode, and the compressor is controlled to run at the preset initial frequency until the real-time frequency is obtained.
  • the air conditioner defrosting control device provided by the present invention is realized by the following technical solutions:
  • An air conditioner defrosting control device comprising:
  • a real-time rate of change acquisition unit configured to acquire the real-time rate of change of the coil temperature of the outdoor heat exchanger during the defrosting operation
  • a real-time frequency determination unit configured to determine the real-time frequency of the compressor according to the relationship between the real-time rate of change and a preset rate-of-change threshold
  • a real-time opening determination unit configured to determine the real-time opening of the expansion valve according to the real-time frequency
  • the defrosting control unit is at least used to respectively control the compressor and the expansion valve according to the real-time frequency and the real-time opening degree.
  • the real-time frequency determination unit determines the real-time frequency of the compressor according to the relationship between the real-time change rate and a preset change rate threshold, specifically including:
  • the real-time frequency is the first real-time frequency, and the first real-time frequency is divided according to the preset initial frequency, real-time outdoor heat exchanger coil temperature, and preset exit. Determination of frost outer disk temperature threshold and first relationship;
  • the real-time frequency is the second real-time frequency, and the second real-time frequency is based on the preset initial frequency and the real-time outdoor heat exchanger coil temperature .
  • the preset exit defrosting outer disk temperature threshold and the second relationship are determined;
  • the second real-time frequency is greater than the first real-time frequency.
  • the real-time opening determination unit determines the real-time opening of the expansion valve according to the real-time frequency, which specifically includes:
  • the real-time opening of the expansion valve is determined according to the real-time frequency and the known linear relationship between the frequency and the opening.
  • the defrosting control unit is further configured to control the air conditioner to enter the defrosting mode when the defrosting condition is met, and control the compressor to run at the preset initial frequency until the obtained the real-time frequency.
  • Another object of the present invention is to provide an air conditioner with high defrosting performance, the air conditioner includes an indoor unit and an outdoor unit, and also includes the above-mentioned air conditioner defrosting control device.
  • the frequency of the compressor and the opening of the expansion valve are not fixed, but dynamically changed based on the real-time change rate of the outdoor heat exchanger coil temperature , and the real-time frequency of the compressor is determined according to the relationship between the real-time change rate and the preset change rate threshold, and then the real-time opening of the expansion valve is determined according to the real-time frequency; since the change rate of the outdoor heat exchanger coil temperature can reflect the The frosting condition of the heater, based on the rate of change, the real-time frequency of the compressor and the real-time opening of the expansion valve can be determined, and the control of different operating states can be performed based on the actual frosting state, which is different from the one that uses a fixed frequency and valve opening.
  • the operating state matches the frosting state, and it is convenient to adopt a more reasonable control strategy to control the operation of the air conditioner, so as to realize fast and clean defrosting and energy-saving control of the defrosting process, and improve the defrosting control of the air conditioner Performance; further, the real-time opening of the expansion valve is determined based on the real-time frequency, which can ensure the stable and reliable operation of the refrigerant circulation system and improve the safety and stability of the air conditioner defrosting control process.
  • Fig. 1 is the flow chart of an embodiment of air conditioner defrosting control method of the present invention
  • Fig. 2 is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention.
  • Fig. 3 is a structural block diagram of an embodiment of the air conditioner defrosting control device of the present invention.
  • the four-way valve switches to the conduction direction in the cooling mode, the compressor runs at a fixed frequency, the electronic expansion valve works at a fixed opening, and the high-temperature and high-pressure refrigerant discharged from the compressor enters
  • the outdoor heat exchanger melts the frost on its surface through vaporization and heat dissipation to achieve the purpose of defrosting.
  • the operating frequency of the compressor and the opening of the electronic expansion valve are fixed, and it is impossible to control different operating states according to the actual frosting conditions, resulting in non-optimal control of the defrosting control.
  • the present invention proposes a defrosting control method of an air conditioner, which uses the change of the coil temperature of the outdoor heat exchanger to reflect the frosting condition of the heat exchanger, and according to the temperature of the coil of the outdoor heat exchanger
  • the frequency of the compressor is determined according to the frequency of the compressor, and then the opening of the expansion valve is determined according to the frequency of the compressor, so as to realize the control of different operating states based on the actual frosting state, so that the operating state matches the frosting state, and it is convenient to adopt more reasonable control
  • the strategy is used to control the operation of the air conditioner.
  • Fig. 1 shows a flow chart of an embodiment of an air conditioner defrosting control method of the present invention.
  • this embodiment implements the air conditioner defrosting control using the following procedure.
  • Step 101 Obtain the real-time change rate of the coil temperature of the outdoor heat exchanger during the defrosting operation.
  • ⁇ t is the preset interval time
  • Tm1 is the coil temperature value obtained when the interval time starts
  • Tm2 is the coil temperature value obtained when the interval time arrives.
  • the acquisition of the temperature value of the coil can be realized by collecting and processing the temperature value of the coil installed on the outdoor heat exchanger.
  • Step 102 Determine the real-time frequency of the compressor according to the relationship between the real-time change rate and the preset change rate threshold.
  • a preset change rate threshold in the air conditioner which is a value that reflects that the temperature change rate of the coil is a critical state, and is also a limit value used to determine different real-time frequency determination methods.
  • the relationship between the real-time change rate and the preset change rate threshold and the corresponding real-time frequency determination method are also preset in the air conditioner. Then, after the relationship between the real-time rate of change and the preset rate-of-change threshold is determined, the way of determining the real-time frequency can be obtained according to the preset correspondence, and then the real-time frequency can be determined.
  • Step 103 Determine the real-time opening of the expansion valve according to the real-time frequency.
  • the air conditioner also presets the correspondence between frequency and opening degree. After the real-time frequency is determined in step 102, the real-time opening degree can be determined according to the preset correspondence.
  • Step 104 Control the compressor and the expansion valve respectively according to the real-time frequency and the real-time opening degree.
  • the defrosting control of the air conditioner is carried out using the method of the above embodiment, the real-time frequency of the compressor is determined according to the relationship between the real-time change rate of the outdoor heat exchanger coil temperature and the preset change rate threshold, and then the real-time opening of the expansion valve is determined according to the real-time frequency
  • the frequency of the compressor and the opening of the expansion valve can be dynamically changed according to the real-time change rate of the coil temperature of the outdoor heat exchanger. As described above, since the rate of change of the coil temperature of the outdoor heat exchanger can reflect the frosting condition of the outdoor heat exchanger, then determining the real-time frequency of the compressor and the real-time opening of the expansion valve based on the rate of change can be based on the actual results.
  • the control of different operating states is implemented.
  • the operating state matches the frosting state, which facilitates the use of a more reasonable control strategy for air conditioner operation control , so as to realize fast and clean defrosting and energy-saving control of the defrosting process, and improve the defrosting control performance of the air conditioner.
  • the real-time opening of the expansion valve is determined based on the real-time frequency, which can ensure the stable and reliable operation of the refrigerant circulation system and improve the safety and stability of the defrosting control process of the air conditioner.
  • Fig. 2 is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention.
  • this embodiment implements the defrosting control of the air conditioner using the following procedure.
  • Step 201 When the defrosting condition is satisfied, control the air conditioner to enter the defrosting mode, and control the compressor to run at a preset initial frequency.
  • Judging whether the defrosting conditions are met can be realized by using existing technologies, for example, according to whether the continuous heating operation time of the air conditioner reaches the set time and/or whether the outdoor coil temperature meets the preset entry defrosting temperature conditions, etc.
  • the compressor is controlled to start running at a preset initial frequency until the rate of change of the temperature of the outdoor heat exchanger coil can be obtained and the real-time frequency of the compressor is determined based on the rate of change.
  • Step 202 Obtain the real-time change rate of the coil temperature of the outdoor heat exchanger during the defrosting operation.
  • the rate of change of the coil temperature reflects the rate at which the coil temperature is rising. The faster the temperature rise, the less frost buildup on the outdoor heat exchanger. Therefore, the rate of change of the outdoor heat exchanger coil temperature can better reflect the frosting condition of the outdoor heat exchanger.
  • ⁇ t is the preset interval time
  • Tm1 is the coil temperature value obtained when the interval time starts
  • Tm2 is the coil temperature value obtained when the interval time arrives.
  • the acquisition of the temperature value of the coil can be realized by collecting and processing the temperature value of the coil installed on the outdoor heat exchanger.
  • Step 203 Determine whether the real-time change rate is greater than a preset change rate threshold. If yes, go to step 204; otherwise, go to step 205.
  • a preset change rate threshold in the air conditioner which is a value that reflects that the temperature change rate of the coil is a critical state, and is also a limit value used to determine different real-time frequency determination methods.
  • the real-time change rate of the outdoor heat exchanger coil temperature obtained in step 202 is compared with the preset change rate threshold, the magnitude of the two is judged, and the process of step 204 or step 205 is executed respectively according to the comparison result.
  • Step 204 Determine the first real-time frequency according to the preset initial frequency, the real-time temperature of the coil of the outdoor heat exchanger, the preset threshold of the temperature of the outer coil after exiting defrosting, and the first relationship.
  • step 203 determines that the real-time change rate of the outdoor heat exchanger coil temperature is greater than the preset change rate threshold, then according to the preset initial frequency, the real-time outdoor heat exchanger coil temperature, the preset exit defrost outer coil temperature threshold and the first relationship Determine the first real-time frequency.
  • the preset initial frequency and the preset threshold for exiting defrosting external panel temperature are known values preset in the air conditioner, the first relationship is a known relationship preset in the air conditioner, and the real-time outdoor heat exchanger coil temperature The value obtained for real-time instrumentation.
  • Step 205 Determine the second real-time frequency according to the preset initial frequency, the real-time outdoor heat exchanger coil temperature, the preset external defrost temperature threshold and the second relationship.
  • step 203 determines that the real-time change rate of the outdoor heat exchanger coil temperature is not greater than the preset change rate threshold, then according to the preset initial frequency, the real-time outdoor heat exchanger coil temperature, the preset exit defrosting outer coil temperature threshold and the second The relationship determines the second real-time frequency.
  • the second relationship is a known relationship preset in the air conditioner.
  • the second real-time frequency is greater than the first real-time frequency.
  • the first real-time frequency is determined according to the first relationship as the actual operating frequency of the compressor; if the real-time change The rate is not greater than the preset change rate threshold, and the second real-time frequency is determined according to the second relationship as the actual running frequency of the compressor; moreover, the second real-time frequency is greater than the first real-time frequency. That is, if the real-time change rate is large, it indicates that the temperature of the outdoor heat exchanger coil rises rapidly, the defrosting speed is fast, and the amount of frosting is small.
  • the requirement of fast and clean frosting can also reduce energy consumption and achieve the purpose of energy saving; if the real-time change rate is small, it indicates that the outdoor heat exchanger has a lot of frosting. At this time, the compressor is controlled to run at the second higher real-time frequency to Achieve fast defrosting.
  • both the first real-time frequency and the second real-time frequency are determined according to the preset initial frequency, the real-time temperature of the outdoor heat exchanger coil and the preset threshold value of the temperature of the outer disk outside the defrost, so that the real-time operating frequency of the compressor is the same as that of the outdoor heat exchanger coil
  • the tube temperature maintains a synchronous dynamic correlation, and is closely related to the initial frequency of defrosting and the external disk temperature conditions of exiting defrosting. Therefore, the operating frequency of the compressor during the defrosting process is closely related to the frosting
  • the start and end of frost are closely related, which can make the defrosting operation frequency a reasonable and accurate frequency value for comprehensive rapid defrosting, complete defrosting, energy saving and consumption reduction. performance.
  • F1 is the first real-time frequency
  • F2 is the second real-time frequency
  • F0 is the preset initial frequency
  • T0 is the preset temperature threshold of the outer panel after exiting defrosting
  • Tm is the real-time outdoor heat exchanger coil temperature
  • K1 and K2 are the Known coefficients
  • C1, C2 are known compensation values.
  • F0 is not less than 50% of the maximum operating frequency of the compressor.
  • Coefficients K1, K2 and compensation values C1, C2 are determined through experiments according to the structural parameters and operating index parameters of the air conditioner.
  • Step 206 Determine the real-time opening of the expansion valve according to the real-time frequency and the known linear relationship between the frequency and the opening.
  • the real-time opening degree of the expansion valve is determined based on the real-time frequency. Moreover, the frequency and the opening degree of the expansion valve satisfy a linear relationship.
  • the following method is used to determine the real-time opening DisT of the expansion valve:
  • F is the real-time frequency of the compressor, specifically the first real-time frequency of step 204 or the second real-time frequency of step 205; a is a known coefficient, and b is a known constant, generally according to the structural parameters of the air conditioner, The operating index parameters, etc. are determined through experiments.
  • Step 207 Control the compressor and the expansion valve respectively according to the real-time frequency and the real-time opening degree.
  • the defrosting control of the air conditioner is performed using the method of the above-mentioned embodiment, and the real-time frequency of the compressor is determined according to the relationship between the real-time change rate of the outdoor heat exchanger coil temperature and the preset change rate threshold value, and the real-time frequency of the outdoor heat exchanger coil temperature is determined.
  • the change rate is large, the determined real-time frequency of the compressor is small, and when the real-time change rate is small, the determined real-time frequency of the compressor is relatively large; then according to the real-time frequency, the real-time opening of the expansion valve is determined according to the linear relationship, so as to realize Compressor frequency and expansion valve opening vary dynamically based on the real-time rate of change of outdoor heat exchanger coil temperature.
  • the rate of change of the coil temperature of the outdoor heat exchanger can reflect the frosting condition of the outdoor heat exchanger, then determining the real-time frequency of the compressor and the real-time opening of the expansion valve based on the rate of change can be based on the actual results.
  • the control of different operating states is implemented. Compared with the existing control strategy that uses a fixed frequency and valve opening, the operating state matches the frosting state, which facilitates the use of a more reasonable control strategy for air conditioner operation control , so as to realize fast and clean defrosting and energy-saving control of the defrosting process, and improve the defrosting control performance of the air conditioner.
  • the real-time opening of the expansion valve is determined based on the real-time frequency, which can ensure the stable and reliable operation of the refrigerant circulation system and improve the safety and stability of the defrosting control process of the air conditioner.
  • Fig. 3 is a structural block diagram of an embodiment of the air conditioner defrosting control device of the present invention.
  • the defrosting control device includes a real-time change rate acquisition unit 31 , a real-time frequency determination unit 32 , a real-time opening degree determination unit 33 and a defrosting control unit 34 .
  • the real-time rate of change acquisition unit 31 is used to acquire the real-time rate of change of the coil temperature of the outdoor heat exchanger during the defrosting operation.
  • the real-time change rate of the coil temperature is calculated by calculating the ratio of the real-time change value of the coil temperature to the interval time within a certain interval time.
  • ⁇ t is the preset interval time
  • Tm1 is the coil temperature value obtained when the interval time starts
  • Tm2 is the coil temperature value obtained when the interval time arrives.
  • the acquisition of the temperature value of the coil can be realized by collecting and processing the temperature value of the coil installed on the outdoor heat exchanger.
  • the real-time frequency determination unit 32 is configured to determine the real-time frequency of the compressor according to the relationship between the real-time rate of change acquired by the real-time rate of change acquisition unit 31 and a known preset rate-of-change threshold. Specifically, a preset change rate threshold is set in the air conditioner; at the same time, the relationship between the real-time change rate and the preset change rate threshold and the corresponding real-time frequency determination method are also preset in the air conditioner. Then, after the relationship between the real-time rate of change and the preset rate-of-change threshold is determined, the way of determining the real-time frequency can be obtained according to the preset correspondence, and then the real-time frequency can be determined. In some preferred embodiments, the real-time frequency determining unit 32 determines the real-time frequency according to the process described in the method embodiment in FIG. 2 and its preferred embodiments.
  • the real-time opening degree determining unit 33 is used for determining the real-time opening degree of the expansion valve according to the real-time frequency determined by the real-time frequency determining unit 32 .
  • the real-time opening degree determining unit 33 determines the real-time opening degree according to the process described in the method embodiment in FIG. 2 and its preferred embodiments.
  • the defrosting control unit 34 is at least used for controlling the compressor of the air conditioner according to the real-time frequency determined by the real-time frequency determining unit 32 , and controlling the expansion valve of the air conditioner according to the real-time opening degree determined by the real-time opening degree determining unit 33 .
  • the defrosting control unit 34 is also used to control the air conditioner to enter the defrosting mode when the defrosting condition is met, and control the compressor to run at a preset initial frequency until the real-time frequency determination unit obtains real-time frequency, and then control the compressor according to the real-time frequency.
  • the defrosting control unit of the air conditioner with the above structure is applied in the air conditioner, runs the corresponding software program, realizes the defrosting control of the air conditioner according to the process of the method embodiment in Fig. 1 or the method embodiment in Fig. 2 or other preferred method embodiments, and obtains the same as Each method embodiment has the same technical effect.

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Abstract

Disclosed in the present invention are a defrosting control method and apparatus for an air conditioner, and an air conditioner. The method comprises: acquiring a real-time change rate of the temperature of a coiler of an outdoor heat exchanger during a defrosting running process; determining a real-time frequency of a compressor according to the relationship between the real-time change rate and a preset change rate threshold value; determining a real-time open degree of an expansion valve according to the real-time frequency; and respectively controlling the compressor and the expansion valve according to the real-time frequency and the real-time open degree. By means of the present invention, the purpose of controlling different running states according to an actual frosting condition can be achieved, thereby improving the defrosting control performance of an air conditioner.

Description

空调器除霜控制方法、控制装置及空调器Air conditioner defrosting control method, control device and air conditioner 技术领域technical field
本发明属于空气调节技术领域，具体地说，涉及空调器技术，更具体地说，涉及一种空调器除霜控制方法、控制装置及空调器。The invention belongs to the technical field of air conditioning, and in particular relates to air conditioner technology, and more specifically relates to an air conditioner defrosting control method, a control device and an air conditioner.
背景技术Background technique
空调器制热运行过程中，室外换热器长时间处于低温状态，如果室外空气温度较低且湿度较大，空气中的水蒸气将在室外换热器表面凝结成霜。室外换热器结霜后，换热效率降低，影响室内舒适性，且造成空调器能效下降。因此，在空调器结霜后，需要及时除霜，控制空调器执行除霜模式，将制热循环转为制冷循环，通过提高室外换热器温度达到去除结霜的目的。During the heating operation of the air conditioner, the outdoor heat exchanger is kept at low temperature for a long time. If the outdoor air temperature is low and the humidity is high, the water vapor in the air will condense into frost on the surface of the outdoor heat exchanger. After the outdoor heat exchanger is frosted, the heat exchange efficiency is reduced, which affects the indoor comfort and causes the energy efficiency of the air conditioner to decrease. Therefore, after the air conditioner is frosted, it needs to be defrosted in time, and the air conditioner is controlled to execute the defrosting mode, and the heating cycle is converted into a refrigeration cycle, and the purpose of removing frost is achieved by increasing the temperature of the outdoor heat exchanger.
现有技术中，空调器除霜时间较短，一般为3-5min。在该较短的除霜时间内，压缩机以固定频率运行，电子膨胀阀以固定开度工作，直至满足除霜退出条件时退出除霜过程。为了在较短的除霜时间内达到除霜干净的效果，通常控制压缩机以较高的固定频率运行，同时控制电子膨胀阀以较大的固定开度工作。这种除霜方法虽然控制简单，但是，无法根据实际结霜状况进行不同运行状态的控制，导致除霜控制为非最优的控制。而且，现有技术中，通常认为除霜时间短，在整个空调器制热运行过程中，其功耗占比小，因而，并未考虑除霜功耗的问题。但在空调器实际使用过程中，除霜过程的节能与除霜干净均是衡量空调器性能的重要指标，对提升空调器整体性能至关重要。因此，亟需对空调器除霜控制进行优化调整。In the prior art, the defrosting time of the air conditioner is relatively short, generally 3-5 minutes. During the short defrosting time, the compressor runs at a fixed frequency, and the electronic expansion valve works at a fixed opening until the defrosting process is exited when the defrosting exit conditions are met. In order to achieve a clean defrosting effect within a short defrosting time, the compressor is usually controlled to run at a higher fixed frequency, while the electronic expansion valve is controlled to work at a larger fixed opening. Although this defrosting method is simple to control, it cannot control different operating states according to actual frosting conditions, resulting in non-optimal defrosting control. Moreover, in the prior art, it is generally believed that the defrosting time is short, and its power consumption accounts for a small proportion in the entire heating operation process of the air conditioner, so the problem of defrosting power consumption is not considered. However, in the actual use of the air conditioner, energy saving during the defrosting process and clean defrosting are important indicators to measure the performance of the air conditioner, which is crucial to improving the overall performance of the air conditioner. Therefore, it is urgent to optimize and adjust the defrosting control of the air conditioner.
技术问题technical problem
本发明的目的在于提供一种空调器除霜控制方法及控制装置，实现根据实际结霜状况进行不同运行状态的控制的目的，提升空调器除霜控制性能。The object of the present invention is to provide an air conditioner defrosting control method and control device, to achieve the purpose of controlling different operating states according to actual frosting conditions, and to improve the air conditioner defrosting control performance.
技术解决方案technical solution
为实现上述发明目的，本发明提供的空调器除霜控制方法采用下述技术方案予以实现：In order to achieve the purpose of the above invention, the air conditioner defrosting control method provided by the present invention is realized by the following technical solutions:
一种空调器除霜控制方法，所述方法包括：A defrosting control method for an air conditioner, the method comprising:
除霜运行过程中，获取室外换热器盘管温度的实时变化速率；During the defrosting operation, obtain the real-time change rate of the outdoor heat exchanger coil temperature;
根据所述实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率；determining the real-time frequency of the compressor according to the relationship between the real-time rate of change and a preset rate-of-change threshold;
根据所述实时频率确定膨胀阀的实时开度；determining the real-time opening of the expansion valve according to the real-time frequency;
根据所述实时频率和所述实时开度分别控制所述压缩机和所述膨胀阀。The compressor and the expansion valve are respectively controlled according to the real-time frequency and the real-time opening degree.
在其中一个优选实施例中，根据所述实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率，具体包括：In one of the preferred embodiments, the real-time frequency of the compressor is determined according to the relationship between the real-time change rate and the preset change rate threshold, which specifically includes:
若所述实时变化速率大于所述预设变化速率阈值，所述实时频率为第一实时频率，所述第一实时频率根据预设初始频率、实时室外换热器盘管温度、预设退出除霜外盘温阈值及第一关系确定；If the real-time change rate is greater than the preset change rate threshold, the real-time frequency is the first real-time frequency, and the first real-time frequency is divided according to the preset initial frequency, real-time outdoor heat exchanger coil temperature, and preset exit. Determination of frost outer disk temperature threshold and first relationship;
若所述实时变化速率不大于所述预设变化速率阈值，所述实时频率为第二实时频率，所述第二实时频率根据所述预设初始频率、所述实时室外换热器盘管温度、所述预设退出除霜外盘温阈值及第二关系确定；If the real-time change rate is not greater than the preset change rate threshold, the real-time frequency is the second real-time frequency, and the second real-time frequency is based on the preset initial frequency and the real-time outdoor heat exchanger coil temperature . The preset exit defrosting outer disk temperature threshold and the second relationship are determined;
且所述第二实时频率大于所述第一实时频率。And the second real-time frequency is greater than the first real-time frequency.
在其中一个优选实施例中，所述第一关系为：In one of the preferred embodiments, the first relationship is:
F1=F0-K1（T0-Tm）+C1；F1=F0-K1(T0-Tm)+C1;
所述第二关系为：The second relationship is:
F2=F0+K2（T0-Tm）+C2；F2=F0+K2(T0-Tm)+C2;
其中，F1为所述第一实时频率，F2为所述第二实时频率，F0为所述预设初始频率，T0为所述预设退出除霜外盘温阈值，Tm为所述实时室外换热器盘管温度，K1、K2为已知的系数，C1、C2为已知的补偿值。Wherein, F1 is the first real-time frequency, F2 is the second real-time frequency, F0 is the preset initial frequency, T0 is the preset temperature threshold for exiting defrosting, and Tm is the real-time outdoor heat exchange Coil temperature, K1, K2 are known coefficients, C1, C2 are known compensation values.
在其中一个优选实施例中，根据所述实时频率确定膨胀阀的实时开度，具体包括：In one of the preferred embodiments, the real-time opening of the expansion valve is determined according to the real-time frequency, which specifically includes:
根据所述实时频率和已知的频率与开度的线性关系确定膨胀阀的实时开度。The real-time opening of the expansion valve is determined according to the real-time frequency and the known linear relationship between the frequency and the opening.
在其中一个优选实施例中，所述方法还包括：In one of the preferred embodiments, the method also includes:
在满足除霜条件时，控制空调器进入除霜模式，控制所述压缩机以所述预设初始频率运行，直至获取到所述实时频率。When the defrosting condition is satisfied, the air conditioner is controlled to enter the defrosting mode, and the compressor is controlled to run at the preset initial frequency until the real-time frequency is obtained.
为实现前述发明目的，本发明提供的空调器除霜控制装置采用下述技术方案予以实现：In order to achieve the aforementioned object of the invention, the air conditioner defrosting control device provided by the present invention is realized by the following technical solutions:
一种空调器除霜控制装置，所述装置包括：An air conditioner defrosting control device, said device comprising:
实时变化速率获取单元，用于在除霜运行过程中获取室外换热器盘管温度的实时变化速率；a real-time rate of change acquisition unit, configured to acquire the real-time rate of change of the coil temperature of the outdoor heat exchanger during the defrosting operation;
实时频率确定单元，用于根据所述实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率；a real-time frequency determination unit, configured to determine the real-time frequency of the compressor according to the relationship between the real-time rate of change and a preset rate-of-change threshold;
实时开度确定单元，用于根据所述实时频率确定膨胀阀的实时开度；a real-time opening determination unit, configured to determine the real-time opening of the expansion valve according to the real-time frequency;
除霜控制单元，至少用于根据所述实时频率和所述实时开度分别控制所述压缩机和所述膨胀阀。The defrosting control unit is at least used to respectively control the compressor and the expansion valve according to the real-time frequency and the real-time opening degree.
在其中一个优选实施例中，所述实时频率确定单元根据所述实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率，具体包括：In one of the preferred embodiments, the real-time frequency determination unit determines the real-time frequency of the compressor according to the relationship between the real-time change rate and a preset change rate threshold, specifically including:
若所述实时变化速率大于所述预设变化速率阈值，所述实时频率为第一实时频率，所述第一实时频率根据预设初始频率、实时室外换热器盘管温度、预设退出除霜外盘温阈值及第一关系确定；If the real-time change rate is greater than the preset change rate threshold, the real-time frequency is the first real-time frequency, and the first real-time frequency is divided according to the preset initial frequency, real-time outdoor heat exchanger coil temperature, and preset exit. Determination of frost outer disk temperature threshold and first relationship;
若所述实时变化速率不大于所述预设变化速率阈值，所述实时频率为第二实时频率，所述第二实时频率根据所述预设初始频率、所述实时室外换热器盘管温度、所述预设退出除霜外盘温阈值及第二关系确定；If the real-time change rate is not greater than the preset change rate threshold, the real-time frequency is the second real-time frequency, and the second real-time frequency is based on the preset initial frequency and the real-time outdoor heat exchanger coil temperature . The preset exit defrosting outer disk temperature threshold and the second relationship are determined;
且所述第二实时频率大于所述第一实时频率。And the second real-time frequency is greater than the first real-time frequency.
在其中一个优选实施例中，所述实时开度确定单元根据所述实时频率确定膨胀阀的实时开度，具体包括：In one of the preferred embodiments, the real-time opening determination unit determines the real-time opening of the expansion valve according to the real-time frequency, which specifically includes:
根据所述实时频率和已知的频率与开度的线性关系确定膨胀阀的实时开度。The real-time opening of the expansion valve is determined according to the real-time frequency and the known linear relationship between the frequency and the opening.
在其中一个优选实施例中，所述除霜控制单元还用于在满足除霜条件时，控制空调器进入除霜模式，控制所述压缩机以所述预设初始频率运行，直至获取到所述实时频率。In one preferred embodiment, the defrosting control unit is further configured to control the air conditioner to enter the defrosting mode when the defrosting condition is met, and control the compressor to run at the preset initial frequency until the obtained the real-time frequency.
本发明的另一目的是提供一种除霜性能高的空调器，所述空调器包括室内机和室外机，还包括上述的空调器除霜控制装置。Another object of the present invention is to provide an air conditioner with high defrosting performance, the air conditioner includes an indoor unit and an outdoor unit, and also includes the above-mentioned air conditioner defrosting control device.
有益效果Beneficial effect
与现有技术相比，本发明的优点和积极效果是：Compared with prior art, advantage and positive effect of the present invention are:
本发明提供的空调器除霜控制方法及控制装置，在除霜运行过程中，压缩机频率和膨胀阀开度并非固定不变，而是基于室外换热器盘管温度的实时变化速率动态变化，并且，是根据实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率，再根据实时频率确定膨胀阀的实时开度；由于室外换热器盘管温度的变化速率能够反映室外换热器的结霜状况，基于该变化速率确定压缩机的实时频率及膨胀阀的实时开度，能够基于实际结霜状态执行不同运行状态的控制，与采用固定不变的频率及阀开度的现有控制策略相比，使得运行状态与结霜状态相匹配，便于采用更加合理地控制策略进行空调器运行控制，从而实现快速干净除霜及除霜过程的节能控制，提升空调器除霜控制性能；进一步的，膨胀阀的实时开度基于实时频率确定，能够保证制冷剂循环***的稳定可靠运行，提升空调器除霜控制过程的安全稳定性能。In the air conditioner defrosting control method and control device provided by the present invention, during the defrosting operation process, the frequency of the compressor and the opening of the expansion valve are not fixed, but dynamically changed based on the real-time change rate of the outdoor heat exchanger coil temperature , and the real-time frequency of the compressor is determined according to the relationship between the real-time change rate and the preset change rate threshold, and then the real-time opening of the expansion valve is determined according to the real-time frequency; since the change rate of the outdoor heat exchanger coil temperature can reflect the The frosting condition of the heater, based on the rate of change, the real-time frequency of the compressor and the real-time opening of the expansion valve can be determined, and the control of different operating states can be performed based on the actual frosting state, which is different from the one that uses a fixed frequency and valve opening. Compared with the existing control strategy, the operating state matches the frosting state, and it is convenient to adopt a more reasonable control strategy to control the operation of the air conditioner, so as to realize fast and clean defrosting and energy-saving control of the defrosting process, and improve the defrosting control of the air conditioner Performance; further, the real-time opening of the expansion valve is determined based on the real-time frequency, which can ensure the stable and reliable operation of the refrigerant circulation system and improve the safety and stability of the air conditioner defrosting control process.
结合附图阅读本发明的具体实施方式后，本发明的其他特点和优点将变得更加清楚。Other characteristics and advantages of the present invention will become clearer after reading the detailed description of the present invention in conjunction with the accompanying drawings.
附图说明Description of drawings
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.
图1是本发明空调器除霜控制方法一个实施例的流程图；Fig. 1 is the flow chart of an embodiment of air conditioner defrosting control method of the present invention;
图2是本发明空调器除霜控制方法另一个实施例的流程图；Fig. 2 is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention;
图3是本发明空调器除霜控制装置一个实施例的结构框图。Fig. 3 is a structural block diagram of an embodiment of the air conditioner defrosting control device of the present invention.
本发明的最佳实施方式BEST MODE FOR CARRYING OUT THE INVENTION
为了使本发明的目的、技术方案及优点更加清楚明白，以下将结合附图和实施例，对本发明作进一步详细说明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
本发明各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时，应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。The technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions is not Exist, also not within the scope of protection required by the present invention.
首先，对本发明的技术思路作简要描述如下：At first, the technical idea of the present invention is briefly described as follows:
现有技术的空调器除霜时，四通阀换向为制冷模式下的导通方向，压缩机以固定频率运行，电子膨胀阀以固定开度工作，压缩机排出的高温、高压制冷剂进入室外热交换器，通过气化散热的方式将其表面的霜融化，实现除霜的目的。除霜过程中，压缩机运行频率和电子膨胀阀开度均固定不变，无法根据实际结霜状况进行不同运行状态的控制，导致除霜控制为非最优的控制。为解决现有技术存在的问题，本发明提出了一种空调器除霜控制方法，该方法利用室外换热器盘管温度的变化反映换热器结霜状况，根据室外换热器盘管温度的变化确定压缩机的频率，再根据压缩机的频率确定膨胀阀的开度，实现基于实际结霜状态执行不同运行状态的控制，使得运行状态与结霜状态相匹配，便于采用更加合理地控制策略进行空调器运行控制。When the air conditioner in the prior art defrosts, the four-way valve switches to the conduction direction in the cooling mode, the compressor runs at a fixed frequency, the electronic expansion valve works at a fixed opening, and the high-temperature and high-pressure refrigerant discharged from the compressor enters The outdoor heat exchanger melts the frost on its surface through vaporization and heat dissipation to achieve the purpose of defrosting. During the defrosting process, the operating frequency of the compressor and the opening of the electronic expansion valve are fixed, and it is impossible to control different operating states according to the actual frosting conditions, resulting in non-optimal control of the defrosting control. In order to solve the problems existing in the prior art, the present invention proposes a defrosting control method of an air conditioner, which uses the change of the coil temperature of the outdoor heat exchanger to reflect the frosting condition of the heat exchanger, and according to the temperature of the coil of the outdoor heat exchanger The frequency of the compressor is determined according to the frequency of the compressor, and then the opening of the expansion valve is determined according to the frequency of the compressor, so as to realize the control of different operating states based on the actual frosting state, so that the operating state matches the frosting state, and it is convenient to adopt more reasonable control The strategy is used to control the operation of the air conditioner.
图1示出了本发明空调器除霜控制方法一个实施例的流程图。Fig. 1 shows a flow chart of an embodiment of an air conditioner defrosting control method of the present invention.
如图1所示，该实施例采用下述过程执行空调器除霜控制。As shown in FIG. 1, this embodiment implements the air conditioner defrosting control using the following procedure.
步骤101：除霜运行过程中，获取室外换热器盘管温度的实时变化速率。Step 101: Obtain the real-time change rate of the coil temperature of the outdoor heat exchanger during the defrosting operation.
空调器除霜运行时，随着霜层的不断融化，室外换热器盘管温度逐渐升高。盘管温度的变化速率反映盘管温度升温的速度。升温速度越快，表明室外换热器上的结霜越少。因此，室外换热器盘管温度的变化速率能够较好地反映室外换热器的结霜状况。盘管温度的实时变化速率通过在一定间隔时间内盘管温度的实时变化值与该间隔时间的比值计算得到。具体的，可采用下述公式计算室外盘管温度的实时变化速率i：i=(Tm2-Tm1)/Δt。其中，Δt为预设间隔时间，Tm1为间隔时间开始时获取的盘管温度值，Tm2为间隔时间到达时获取的盘管温度值。而盘管温度值的获取，可以通过设置在室外换热器上的盘温传感器采集并处理而实现。When the air conditioner is running in defrost, as the frost layer continues to melt, the temperature of the outdoor heat exchanger coil gradually rises. The rate of change of the coil temperature reflects the rate at which the coil temperature is rising. The faster the temperature rise, the less frost buildup on the outdoor heat exchanger. Therefore, the rate of change of the outdoor heat exchanger coil temperature can better reflect the frosting condition of the outdoor heat exchanger. The real-time change rate of the coil temperature is calculated by the ratio of the real-time change value of the coil temperature within a certain interval time to the interval time. Specifically, the following formula can be used to calculate the real-time change rate i of the temperature of the outdoor coil: i=(Tm2-Tm1)/Δt. Wherein, Δt is the preset interval time, Tm1 is the coil temperature value obtained when the interval time starts, and Tm2 is the coil temperature value obtained when the interval time arrives. The acquisition of the temperature value of the coil can be realized by collecting and processing the temperature value of the coil installed on the outdoor heat exchanger.
步骤102：根据实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率。Step 102: Determine the real-time frequency of the compressor according to the relationship between the real-time change rate and the preset change rate threshold.
空调器中置有预设变化速率阈值，该阈值为反映盘管温度变化速度为一个临界状态的一个值，也是用来决定不同实时频率确定方式的一个界限值。同时，空调器中还预置有实时变化速率与预设变化速率阈值的关系及其所对应的实时频率确定方式的对应。那么，在确定了实时变化速率与预设变化速率阈值的关系后，根据预置的对应即可获得实时频率的确定方式，进而确定出实时频率。There is a preset change rate threshold in the air conditioner, which is a value that reflects that the temperature change rate of the coil is a critical state, and is also a limit value used to determine different real-time frequency determination methods. At the same time, the relationship between the real-time change rate and the preset change rate threshold and the corresponding real-time frequency determination method are also preset in the air conditioner. Then, after the relationship between the real-time rate of change and the preset rate-of-change threshold is determined, the way of determining the real-time frequency can be obtained according to the preset correspondence, and then the real-time frequency can be determined.
步骤103：根据实时频率确定膨胀阀的实时开度。Step 103: Determine the real-time opening of the expansion valve according to the real-time frequency.
空调器中还预置有频率与开度的对应，在步骤102确定了实时频率后，根据预置的对应即可确定出实时开度。The air conditioner also presets the correspondence between frequency and opening degree. After the real-time frequency is determined in step 102, the real-time opening degree can be determined according to the preset correspondence.
步骤104：根据实时频率和实时开度分别控制压缩机和膨胀阀。Step 104: Control the compressor and the expansion valve respectively according to the real-time frequency and the real-time opening degree.
采用上述实施例的方法执行空调器除霜控制，根据室外换热器盘管温度的实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率，再根据实时频率确定膨胀阀的实时开度，实现压缩机频率与膨胀阀开度根据室外换热器盘管温度的实时变化速率而动态变化。如上所描述，由于室外换热器盘管温度的变化速率能够反映室外换热器的结霜状况，那么，基于该变化速率确定压缩机的实时频率及膨胀阀的实时开度，能够基于实际结霜状态执行不同运行状态的控制，与采用固定不变的频率及阀开度的现有控制策略相比，使得运行状态与结霜状态相匹配，便于采用更加合理地控制策略进行空调器运行控制，从而实现快速干净除霜及除霜过程的节能控制，提升空调器除霜控制性能。另外，膨胀阀的实时开度基于实时频率确定，能够保证制冷剂循环***的稳定可靠运行，提升空调器除霜控制过程的安全稳定性能。The defrosting control of the air conditioner is carried out using the method of the above embodiment, the real-time frequency of the compressor is determined according to the relationship between the real-time change rate of the outdoor heat exchanger coil temperature and the preset change rate threshold, and then the real-time opening of the expansion valve is determined according to the real-time frequency The frequency of the compressor and the opening of the expansion valve can be dynamically changed according to the real-time change rate of the coil temperature of the outdoor heat exchanger. As described above, since the rate of change of the coil temperature of the outdoor heat exchanger can reflect the frosting condition of the outdoor heat exchanger, then determining the real-time frequency of the compressor and the real-time opening of the expansion valve based on the rate of change can be based on the actual results. In the frost state, the control of different operating states is implemented. Compared with the existing control strategy that uses a fixed frequency and valve opening, the operating state matches the frosting state, which facilitates the use of a more reasonable control strategy for air conditioner operation control , so as to realize fast and clean defrosting and energy-saving control of the defrosting process, and improve the defrosting control performance of the air conditioner. In addition, the real-time opening of the expansion valve is determined based on the real-time frequency, which can ensure the stable and reliable operation of the refrigerant circulation system and improve the safety and stability of the defrosting control process of the air conditioner.
图2所示为本发明空调器除霜控制方法另一个实施例的流程图。Fig. 2 is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention.
如图2所示，该实施例采用下述过程执行空调器除霜控制。As shown in FIG. 2, this embodiment implements the defrosting control of the air conditioner using the following procedure.
步骤201：满足除霜条件时，控制空调器进入除霜模式，控制压缩机以预设初始频率运行。Step 201: When the defrosting condition is satisfied, control the air conditioner to enter the defrosting mode, and control the compressor to run at a preset initial frequency.
是否满足除霜条件的判断，可采用现有技术来实现，譬如，根据空调器连续制热运行时间是否达到设定时间和/或室外盘管温度是否满足预设进入除霜温度条件等。Judging whether the defrosting conditions are met can be realized by using existing technologies, for example, according to whether the continuous heating operation time of the air conditioner reaches the set time and/or whether the outdoor coil temperature meets the preset entry defrosting temperature conditions, etc.
空调器刚进入除霜模式，并不能立刻得到室外换热器盘管温度的变化速率，无法根据盘管温度的变化速率确定压缩机频率。则在空调器刚进入除霜模式时，控制压缩机以预设初始频率开始运行，直至能够获取到室外换热器盘管温度的变化速率并基于该变化速率确定出压缩机实时频率。When the air conditioner just enters the defrosting mode, the change rate of the outdoor heat exchanger coil temperature cannot be obtained immediately, and the compressor frequency cannot be determined according to the change rate of the coil temperature. Then, when the air conditioner just enters the defrosting mode, the compressor is controlled to start running at a preset initial frequency until the rate of change of the temperature of the outdoor heat exchanger coil can be obtained and the real-time frequency of the compressor is determined based on the rate of change.
步骤202：除霜运行过程中，获取室外换热器盘管温度的实时变化速率。Step 202: Obtain the real-time change rate of the coil temperature of the outdoor heat exchanger during the defrosting operation.
在除霜运行过程中，随着霜层的不断融化，室外换热器盘管温度逐渐升高。盘管温度的变化速率反映盘管温度升温的速度。升温速度越快，表明室外换热器上的结霜越少。因此，室外换热器盘管温度的变化速率能够较好地反映室外换热器的结霜状况。盘管温度的实时变化速率通过在一定间隔时间内盘管温度的实时变化值与该间隔时间的比值计算得到。具体的，可采用下述公式计算室外盘管温度的实时变化速率i：i=(Tm2-Tm1)/Δt。其中，Δt为预设间隔时间，Tm1为间隔时间开始时获取的盘管温度值，Tm2为间隔时间到达时获取的盘管温度值。而盘管温度值的获取，可以通过设置在室外换热器上的盘温传感器采集并处理而实现。During the defrosting operation, as the frost layer continues to melt, the temperature of the outdoor heat exchanger coil gradually increases. The rate of change of the coil temperature reflects the rate at which the coil temperature is rising. The faster the temperature rise, the less frost buildup on the outdoor heat exchanger. Therefore, the rate of change of the outdoor heat exchanger coil temperature can better reflect the frosting condition of the outdoor heat exchanger. The real-time change rate of the coil temperature is calculated by the ratio of the real-time change value of the coil temperature within a certain interval time to the interval time. Specifically, the following formula can be used to calculate the real-time change rate i of the temperature of the outdoor coil: i=(Tm2-Tm1)/Δt. Wherein, Δt is the preset interval time, Tm1 is the coil temperature value obtained when the interval time starts, and Tm2 is the coil temperature value obtained when the interval time arrives. The acquisition of the temperature value of the coil can be realized by collecting and processing the temperature value of the coil installed on the outdoor heat exchanger.
步骤203：判断实时变化速率是否大于预设变化速率阈值。若是，执行步骤204；否则，执行步骤205。Step 203: Determine whether the real-time change rate is greater than a preset change rate threshold. If yes, go to step 204; otherwise, go to step 205.
空调器中置有预设变化速率阈值，该阈值为反映盘管温度变化速度为一个临界状态的一个值，也是用来决定不同实时频率确定方式的一个界限值。将步骤202获得的室外换热器盘管温度的实时变化速率与该预设变化速率阈值进行比较，判断两者的大小，并根据比较结果分别执行步骤204或者步骤205的过程。There is a preset change rate threshold in the air conditioner, which is a value that reflects that the temperature change rate of the coil is a critical state, and is also a limit value used to determine different real-time frequency determination methods. The real-time change rate of the outdoor heat exchanger coil temperature obtained in step 202 is compared with the preset change rate threshold, the magnitude of the two is judged, and the process of step 204 or step 205 is executed respectively according to the comparison result.
步骤204：根据预设初始频率、实时室外换热器盘管温度、预设退出除霜外盘温阈值及第一关系确定第一实时频率。Step 204: Determine the first real-time frequency according to the preset initial frequency, the real-time temperature of the coil of the outdoor heat exchanger, the preset threshold of the temperature of the outer coil after exiting defrosting, and the first relationship.
若步骤203判定室外换热器盘管温度的实时变化速率大于预设变化速率阈值，则根据预设初始频率、实时室外换热器盘管温度、预设退出除霜外盘温阈值及第一关系确定第一实时频率。其中，预设初始频率和预设退出除霜外盘温阈值为预置在空调器中的已知值，第一关系为预置在空调器中的已知关系，实时室外换热器盘管温度为实时检测获取的值。If step 203 determines that the real-time change rate of the outdoor heat exchanger coil temperature is greater than the preset change rate threshold, then according to the preset initial frequency, the real-time outdoor heat exchanger coil temperature, the preset exit defrost outer coil temperature threshold and the first relationship Determine the first real-time frequency. Among them, the preset initial frequency and the preset threshold for exiting defrosting external panel temperature are known values preset in the air conditioner, the first relationship is a known relationship preset in the air conditioner, and the real-time outdoor heat exchanger coil temperature The value obtained for real-time instrumentation.
步骤205：根据预设初始频率、实时室外换热器盘管温度、预设退出除霜外盘温阈值及第二关系确定第二实时频率。Step 205: Determine the second real-time frequency according to the preset initial frequency, the real-time outdoor heat exchanger coil temperature, the preset external defrost temperature threshold and the second relationship.
若步骤203判定室外换热器盘管温度的实时变化速率不大于预设变化速率阈值，则根据预设初始频率、实时室外换热器盘管温度、预设退出除霜外盘温阈值及第二关系确定第二实时频率。其中，第二关系为预置在空调器中的已知关系。If step 203 determines that the real-time change rate of the outdoor heat exchanger coil temperature is not greater than the preset change rate threshold, then according to the preset initial frequency, the real-time outdoor heat exchanger coil temperature, the preset exit defrosting outer coil temperature threshold and the second The relationship determines the second real-time frequency. Wherein, the second relationship is a known relationship preset in the air conditioner.
而且，第二实时频率大于第一实时频率。Moreover, the second real-time frequency is greater than the first real-time frequency.
采用步骤203至205的控制过程，若室外换热器盘管温度的实时变化速率大于预设变化速率阈值，根据第一关系确定出第一实时频率，作为压缩机实际运行的频率；若实时变化速率不大于预设变化速率阈值，根据第二关系确定出第二实时频率，作为压缩机实际运行的频率；而且，第二实时频率大于第一实时频率。也即，若实时变化速率大，表明室外换热器盘管温度上升快，除霜速度快，结霜量少，此时，控制压缩机以较低的第一实时频率运行，既能满足除霜快速干净的要求，又能降低能耗，达到节能的目的；若实时变化速率小，表明室外换热器结霜量多，此时，控制压缩机以较高的第二实时频率运行，以实现快速除霜。Using the control process of steps 203 to 205, if the real-time change rate of the outdoor heat exchanger coil temperature is greater than the preset change rate threshold, the first real-time frequency is determined according to the first relationship as the actual operating frequency of the compressor; if the real-time change The rate is not greater than the preset change rate threshold, and the second real-time frequency is determined according to the second relationship as the actual running frequency of the compressor; moreover, the second real-time frequency is greater than the first real-time frequency. That is, if the real-time change rate is large, it indicates that the temperature of the outdoor heat exchanger coil rises rapidly, the defrosting speed is fast, and the amount of frosting is small. The requirement of fast and clean frosting can also reduce energy consumption and achieve the purpose of energy saving; if the real-time change rate is small, it indicates that the outdoor heat exchanger has a lot of frosting. At this time, the compressor is controlled to run at the second higher real-time frequency to Achieve fast defrosting.
而且，第一实时频率和第二实时频率均根据预设初始频率、实时室外换热器盘管温度及预设退出除霜外盘温阈值来确定，使得压缩机实时运行频率与室外换热器盘管温度保持同步的动态相关性，且与开始除霜的初始频率及退出除霜的外盘温条件紧密相关，从而，除霜过程中压缩机的运行频率与整个除霜过程的结霜状态、除霜的开始及结束均密切关联，能使得除霜运行频率为综合快速除霜、除霜彻底、节能降耗的一个合理精确频率值，在该运行频率下执行除霜，有利于提升除霜综合性能。Moreover, both the first real-time frequency and the second real-time frequency are determined according to the preset initial frequency, the real-time temperature of the outdoor heat exchanger coil and the preset threshold value of the temperature of the outer disk outside the defrost, so that the real-time operating frequency of the compressor is the same as that of the outdoor heat exchanger coil The tube temperature maintains a synchronous dynamic correlation, and is closely related to the initial frequency of defrosting and the external disk temperature conditions of exiting defrosting. Therefore, the operating frequency of the compressor during the defrosting process is closely related to the frosting The start and end of frost are closely related, which can make the defrosting operation frequency a reasonable and accurate frequency value for comprehensive rapid defrosting, complete defrosting, energy saving and consumption reduction. performance.
在一些优选实施例中，第一关系为：F1=F0-K1（T0-Tm）；第二关系为：F2=F0+K2（T0-Tm）。In some preferred embodiments, the first relationship is: F1=F0-K1(T0-Tm); the second relationship is: F2=F0+K2(T0-Tm).
其中，F1为第一实时频率，F2为第二实时频率，F0为预设初始频率；T0为预设退出除霜外盘温阈值，Tm为实时室外换热器盘管温度；K1、K2为已知的系数，C1、C2为已知的补偿值。优选的，F0不小于压缩机最大运转频率的50%。系数K1、K2及补偿值C1、C2，根据空调器结构参数、运行指标参数等通过试验确定。Among them, F1 is the first real-time frequency, F2 is the second real-time frequency, and F0 is the preset initial frequency; T0 is the preset temperature threshold of the outer panel after exiting defrosting; Tm is the real-time outdoor heat exchanger coil temperature; K1 and K2 are the Known coefficients, C1, C2 are known compensation values. Preferably, F0 is not less than 50% of the maximum operating frequency of the compressor. Coefficients K1, K2 and compensation values C1, C2 are determined through experiments according to the structural parameters and operating index parameters of the air conditioner.
步骤206：根据实时频率和已知的频率与开度的线性关系确定膨胀阀的实时开度。Step 206: Determine the real-time opening of the expansion valve according to the real-time frequency and the known linear relationship between the frequency and the opening.
在通过步骤204或步骤205确定了压缩机的实时频率后，再基于实时频率确定膨胀阀的实时开度。而且，频率与膨胀阀的开度满足线性关系。After the real-time frequency of the compressor is determined through step 204 or step 205, then the real-time opening degree of the expansion valve is determined based on the real-time frequency. Moreover, the frequency and the opening degree of the expansion valve satisfy a linear relationship.
在一些优选实施例中，采用下述方法确定膨胀阀的实时开度DisT：In some preferred embodiments, the following method is used to determine the real-time opening DisT of the expansion valve:
DisT=a*F+b。DisT=a*F+b.
公式中，F为压缩机的实时频率，具体为步骤204的第一实时频率或步骤205的第二实时频率；a为已知的系数，b为已知的常数，一般根据空调器结构参数、运行指标参数等通过试验确定。In the formula, F is the real-time frequency of the compressor, specifically the first real-time frequency of step 204 or the second real-time frequency of step 205; a is a known coefficient, and b is a known constant, generally according to the structural parameters of the air conditioner, The operating index parameters, etc. are determined through experiments.
步骤207：根据实时频率和实时开度分别控制压缩机和膨胀阀。Step 207: Control the compressor and the expansion valve respectively according to the real-time frequency and the real-time opening degree.
采用上述实施例的方法执行空调器除霜控制，根据室外换热器盘管温度的实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率，在室外换热器盘管温度的实时变化速率大时，确定的压缩机的实时频率较小，而在实时变化速率小时，确定的压缩机的实时频率较大；再根据实时频率、按照线性关系确定膨胀阀的实时开度，从而实现压缩机频率与膨胀阀开度根据室外换热器盘管温度的实时变化速率而动态变化。如上所描述，由于室外换热器盘管温度的变化速率能够反映室外换热器的结霜状况，那么，基于该变化速率确定压缩机的实时频率及膨胀阀的实时开度，能够基于实际结霜状态执行不同运行状态的控制，与采用固定不变的频率及阀开度的现有控制策略相比，使得运行状态与结霜状态相匹配，便于采用更加合理地控制策略进行空调器运行控制，从而实现快速干净除霜及除霜过程的节能控制，提升空调器除霜控制性能。另外，膨胀阀的实时开度基于实时频率确定，能够保证制冷剂循环***的稳定可靠运行，提升空调器除霜控制过程的安全稳定性能。The defrosting control of the air conditioner is performed using the method of the above-mentioned embodiment, and the real-time frequency of the compressor is determined according to the relationship between the real-time change rate of the outdoor heat exchanger coil temperature and the preset change rate threshold value, and the real-time frequency of the outdoor heat exchanger coil temperature is determined. When the change rate is large, the determined real-time frequency of the compressor is small, and when the real-time change rate is small, the determined real-time frequency of the compressor is relatively large; then according to the real-time frequency, the real-time opening of the expansion valve is determined according to the linear relationship, so as to realize Compressor frequency and expansion valve opening vary dynamically based on the real-time rate of change of outdoor heat exchanger coil temperature. As described above, since the rate of change of the coil temperature of the outdoor heat exchanger can reflect the frosting condition of the outdoor heat exchanger, then determining the real-time frequency of the compressor and the real-time opening of the expansion valve based on the rate of change can be based on the actual results. In the frost state, the control of different operating states is implemented. Compared with the existing control strategy that uses a fixed frequency and valve opening, the operating state matches the frosting state, which facilitates the use of a more reasonable control strategy for air conditioner operation control , so as to realize fast and clean defrosting and energy-saving control of the defrosting process, and improve the defrosting control performance of the air conditioner. In addition, the real-time opening of the expansion valve is determined based on the real-time frequency, which can ensure the stable and reliable operation of the refrigerant circulation system and improve the safety and stability of the defrosting control process of the air conditioner.
图3所示为本发明空调器除霜控制装置一个实施例的结构框图。Fig. 3 is a structural block diagram of an embodiment of the air conditioner defrosting control device of the present invention.
如图3所示，该实施例的除霜控制装置所包括的结构单元、结构单元的功能及相互之间的连接关系如下：As shown in Figure 3, the structural units included in the defrosting control device of this embodiment, the functions of the structural units and the connection relationship between them are as follows:
除霜控制装置包括实时变化速率获取单元31、实时频率确定单元32、实时开度确定单元33及除霜控制单元34。The defrosting control device includes a real-time change rate acquisition unit 31 , a real-time frequency determination unit 32 , a real-time opening degree determination unit 33 and a defrosting control unit 34 .
实时变化速率获取单元31用于在除霜运行过程中获取室外换热器盘管温度的实时变化速率。具体的，盘管温度的实时变化速率通过在一定间隔时间内盘管温度的实时变化值与该间隔时间的比值计算得到。具体的，可采用下述公式计算室外盘管温度的实时变化速率i：i=(Tm2-Tm1)/Δt。其中，Δt为预设间隔时间，Tm1为间隔时间开始时获取的盘管温度值，Tm2为间隔时间到达时获取的盘管温度值。而盘管温度值的获取，可以通过设置在室外换热器上的盘温传感器采集并处理而实现。The real-time rate of change acquisition unit 31 is used to acquire the real-time rate of change of the coil temperature of the outdoor heat exchanger during the defrosting operation. Specifically, the real-time change rate of the coil temperature is calculated by calculating the ratio of the real-time change value of the coil temperature to the interval time within a certain interval time. Specifically, the following formula can be used to calculate the real-time change rate i of the temperature of the outdoor coil: i=(Tm2-Tm1)/Δt. Wherein, Δt is the preset interval time, Tm1 is the coil temperature value obtained when the interval time starts, and Tm2 is the coil temperature value obtained when the interval time arrives. The acquisition of the temperature value of the coil can be realized by collecting and processing the temperature value of the coil installed on the outdoor heat exchanger.
实时频率确定单元32用于根据实时变化速率获取单元31所获取的实时变化速率与已知的预设变化速率阈值的关系确定压缩机的实时频率。具体的，空调器中置有预设变化速率阈值；同时，空调器中还预置有实时变化速率与预设变化速率阈值的关系及其所对应的实时频率确定方式的对应。那么，在确定了实时变化速率与预设变化速率阈值的关系后，根据预置的对应即可获得实时频率的确定方式，进而确定出实时频率。在一些优选实施例中，实时频率确定单元32根据图2方法实施例及其优选实施例中描述的过程确定实时频率。The real-time frequency determination unit 32 is configured to determine the real-time frequency of the compressor according to the relationship between the real-time rate of change acquired by the real-time rate of change acquisition unit 31 and a known preset rate-of-change threshold. Specifically, a preset change rate threshold is set in the air conditioner; at the same time, the relationship between the real-time change rate and the preset change rate threshold and the corresponding real-time frequency determination method are also preset in the air conditioner. Then, after the relationship between the real-time rate of change and the preset rate-of-change threshold is determined, the way of determining the real-time frequency can be obtained according to the preset correspondence, and then the real-time frequency can be determined. In some preferred embodiments, the real-time frequency determining unit 32 determines the real-time frequency according to the process described in the method embodiment in FIG. 2 and its preferred embodiments.
实时开度确定单元33用于根据实时频率确定单元32所确定的实时频率来确定膨胀阀的实时开度。在一些优选实施例中，实时开度确定单元33根据图2方法实施例及其优选实施例中描述的过程确定实时开度。The real-time opening degree determining unit 33 is used for determining the real-time opening degree of the expansion valve according to the real-time frequency determined by the real-time frequency determining unit 32 . In some preferred embodiments, the real-time opening degree determining unit 33 determines the real-time opening degree according to the process described in the method embodiment in FIG. 2 and its preferred embodiments.
除霜控制单元34至少用于根据实时频率确定单元32所确定的实时频率控制空调器的压缩机，以及根据实时开度确定单元33所确定的实时开度控制空调器的膨胀阀。在其他一些优选实施例中，除霜控制单元34还用于在满足除霜条件时，控制空调器进入除霜模式，控制所述压缩机以预设初始频率运行，直至实时频率确定单元获取到实时频率，然后根据实时频率控制压缩机。The defrosting control unit 34 is at least used for controlling the compressor of the air conditioner according to the real-time frequency determined by the real-time frequency determining unit 32 , and controlling the expansion valve of the air conditioner according to the real-time opening degree determined by the real-time opening degree determining unit 33 . In some other preferred embodiments, the defrosting control unit 34 is also used to control the air conditioner to enter the defrosting mode when the defrosting condition is met, and control the compressor to run at a preset initial frequency until the real-time frequency determination unit obtains real-time frequency, and then control the compressor according to the real-time frequency.
上述结构的空调器除霜控制单元应用在空调器中，运行相应的软件程序，按照图1方法实施例或图2方法实施例或其他优选方法实施例的过程实现空调器除霜控制，获得与各方法实施例相同的技术效果。The defrosting control unit of the air conditioner with the above structure is applied in the air conditioner, runs the corresponding software program, realizes the defrosting control of the air conditioner according to the process of the method embodiment in Fig. 1 or the method embodiment in Fig. 2 or other preferred method embodiments, and obtains the same as Each method embodiment has the same technical effect.
以上实施例仅用以说明本发明的技术方案，而非对其进行限制；尽管参照前述实施例对本发明进行了详细的说明，对于本领域的普通技术人员来说，依然可以对前述实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或替换，并不使相应技术方案的本质脱离本发明所要求保护的技术方案的精神和范围。The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art can still understand the foregoing embodiments. Modifications are made to the technical solutions described, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed in the present invention.

Claims (10)

  1. 一种空调器除霜控制方法，其特征在于，所述方法包括：A defrosting control method for an air conditioner, characterized in that the method comprises:
    除霜运行过程中，获取室外换热器盘管温度的实时变化速率；During the defrosting operation, obtain the real-time change rate of the outdoor heat exchanger coil temperature;
    根据所述实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率；determining the real-time frequency of the compressor according to the relationship between the real-time rate of change and a preset rate-of-change threshold;
    根据所述实时频率确定膨胀阀的实时开度；determining the real-time opening of the expansion valve according to the real-time frequency;
    根据所述实时频率和所述实时开度分别控制所述压缩机和所述膨胀阀。The compressor and the expansion valve are respectively controlled according to the real-time frequency and the real-time opening degree.
  2. 根据权利要求1所述的空调器除霜控制方法，其特征在于，根据所述实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率，具体包括：The air conditioner defrosting control method according to claim 1, wherein the real-time frequency of the compressor is determined according to the relationship between the real-time rate of change and the preset rate of change threshold, specifically comprising:
    若所述实时变化速率大于所述预设变化速率阈值，所述实时频率为第一实时频率，所述第一实时频率根据预设初始频率、实时室外换热器盘管温度、预设退出除霜外盘温阈值及第一关系确定；If the real-time change rate is greater than the preset change rate threshold, the real-time frequency is the first real-time frequency, and the first real-time frequency is divided according to the preset initial frequency, real-time outdoor heat exchanger coil temperature, and preset exit. Determination of frost outer disk temperature threshold and first relationship;
    若所述实时变化速率不大于所述预设变化速率阈值，所述实时频率为第二实时频率，所述第二实时频率根据所述预设初始频率、所述实时室外换热器盘管温度、所述预设退出除霜外盘温阈值及第二关系确定；If the real-time change rate is not greater than the preset change rate threshold, the real-time frequency is the second real-time frequency, and the second real-time frequency is based on the preset initial frequency and the real-time outdoor heat exchanger coil temperature . The preset exit defrosting outer disk temperature threshold and the second relationship are determined;
    且所述第二实时频率大于所述第一实时频率。And the second real-time frequency is greater than the first real-time frequency.
  3. 根据权利要求2所述的空调器除霜控制方法，其特征在于，The air conditioner defrosting control method according to claim 2, characterized in that:
    所述第一关系为：The first relationship is:
    F1=F0-K1（T0-Tm）+C1；F1=F0-K1(T0-Tm)+C1;
    所述第二关系为：The second relationship is:
    F2=F0+K2（T0-Tm）+C2；F2=F0+K2(T0-Tm)+C2;
    其中，F1为所述第一实时频率，F2为所述第二实时频率，F0为所述预设初始频率，T0为所述预设退出除霜外盘温阈值，Tm为所述实时室外换热器盘管温度，K1、K2为已知的系数，C1、C2为已知的补偿值。Wherein, F1 is the first real-time frequency, F2 is the second real-time frequency, F0 is the preset initial frequency, T0 is the preset temperature threshold for exiting defrosting, and Tm is the real-time outdoor heat exchange Coil temperature, K1, K2 are known coefficients, C1, C2 are known compensation values.
  4. 根据权利要求1所述的空调器除霜控制方法，其特征在于，根据所述实时频率确定膨胀阀的实时开度，具体包括：The air conditioner defrosting control method according to claim 1, wherein the real-time opening of the expansion valve is determined according to the real-time frequency, specifically comprising:
    根据所述实时频率和已知的频率与开度的线性关系确定膨胀阀的实时开度。The real-time opening of the expansion valve is determined according to the real-time frequency and the known linear relationship between the frequency and the opening.
  5. 根据权利要求2至4中任一项所述的空调器除霜控制方法，其特征在于，所述方法还包括：The air conditioner defrosting control method according to any one of claims 2 to 4, characterized in that the method further comprises:
    在满足除霜条件时，控制空调器进入除霜模式，控制所述压缩机以所述预设初始频率运行，直至获取到所述实时频率。When the defrosting condition is satisfied, the air conditioner is controlled to enter the defrosting mode, and the compressor is controlled to run at the preset initial frequency until the real-time frequency is acquired.
  6. 一种空调器除霜控制装置，其特征在于，所述装置包括：A defrosting control device for an air conditioner, characterized in that the device includes:
    实时变化速率获取单元，用于在除霜运行过程中获取室外换热器盘管温度的实时变化速率；a real-time rate of change acquisition unit, configured to acquire the real-time rate of change of the coil temperature of the outdoor heat exchanger during the defrosting operation;
    实时频率确定单元，用于根据所述实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率；a real-time frequency determination unit, configured to determine the real-time frequency of the compressor according to the relationship between the real-time rate of change and a preset rate-of-change threshold;
    实时开度确定单元，用于根据所述实时频率确定膨胀阀的实时开度；a real-time opening determination unit, configured to determine the real-time opening of the expansion valve according to the real-time frequency;
    除霜控制单元，至少用于根据所述实时频率和所述实时开度分别控制所述压缩机和所述膨胀阀。The defrosting control unit is at least used to respectively control the compressor and the expansion valve according to the real-time frequency and the real-time opening degree.
  7. 根据权利要求6所述的空调器除霜控制装置，其特征在于，所述实时频率确定单元根据所述实时变化速率与预设变化速率阈值的关系确定压缩机的实时频率，具体包括：The defrosting control device for an air conditioner according to claim 6, wherein the real-time frequency determination unit determines the real-time frequency of the compressor according to the relationship between the real-time change rate and a preset change rate threshold, specifically comprising:
    若所述实时变化速率大于所述预设变化速率阈值，所述实时频率为第一实时频率，所述第一实时频率根据预设初始频率、实时室外换热器盘管温度、预设退出除霜外盘温阈值及第一关系确定；If the real-time change rate is greater than the preset change rate threshold, the real-time frequency is the first real-time frequency, and the first real-time frequency is divided according to the preset initial frequency, real-time outdoor heat exchanger coil temperature, and preset exit. Determination of frost outer disk temperature threshold and first relationship;
    若所述实时变化速率不大于所述预设变化速率阈值，所述实时频率为第二实时频率，所述第二实时频率根据所述预设初始频率、所述实时室外换热器盘管温度、所述预设退出除霜外盘温阈值及第二关系确定；If the real-time change rate is not greater than the preset change rate threshold, the real-time frequency is the second real-time frequency, and the second real-time frequency is based on the preset initial frequency and the real-time outdoor heat exchanger coil temperature . The preset exit defrosting outer disk temperature threshold and the second relationship are determined;
    且所述第二实时频率大于所述第一实时频率。And the second real-time frequency is greater than the first real-time frequency.
  8. 根据权利要求6所述的空调器除霜控制装置，其特征在于，所述实时开度确定单元根据所述实时频率确定膨胀阀的实时开度，具体包括：The defrosting control device for an air conditioner according to claim 6, wherein the real-time opening determination unit determines the real-time opening of the expansion valve according to the real-time frequency, specifically comprising:
    根据所述实时频率和已知的频率与开度的线性关系确定膨胀阀的实时开度。The real-time opening of the expansion valve is determined according to the real-time frequency and the known linear relationship between the frequency and the opening.
  9. 根据权利要求6至8中任一项所述的空调器除霜控制装置，其特征在于，所述除霜控制单元还用于在满足除霜条件时，控制空调器进入除霜模式，控制所述压缩机以所述预设初始频率运行，直至获取到所述实时频率。The defrosting control device for an air conditioner according to any one of claims 6 to 8, wherein the defrosting control unit is further configured to control the air conditioner to enter the defrosting mode when the defrosting condition is met, and control the The compressor runs at the preset initial frequency until the real-time frequency is acquired.
  10. 一种空调器，包括室内机和室外机，其特征在于，所述空调器还包括上述权利要求6至9中任一项所述的空调器除霜控制装置。An air conditioner, comprising an indoor unit and an outdoor unit, characterized in that the air conditioner further comprises the air conditioner defrosting control device according to any one of claims 6 to 9 above.
PCT/CN2022/093083 2021-10-29 2022-05-16 Defrosting control method and apparatus for air conditioner, and air conditioner WO2023071148A1 (en)

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