WO2021218513A1 - 多联机空调机组的除霜控制方法 - Google Patents

多联机空调机组的除霜控制方法 Download PDF

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WO2021218513A1
WO2021218513A1 PCT/CN2021/083251 CN2021083251W WO2021218513A1 WO 2021218513 A1 WO2021218513 A1 WO 2021218513A1 CN 2021083251 W CN2021083251 W CN 2021083251W WO 2021218513 A1 WO2021218513 A1 WO 2021218513A1
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conditioning unit
unit
defrosting
air conditioning
difference
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PCT/CN2021/083251
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English (en)
French (fr)
Inventor
高强
张晓迪
王海胜
张铭
周明杰
宋德跃
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青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2021218513A1 publication Critical patent/WO2021218513A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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

Definitions

  • the invention belongs to the technical field of air-conditioning units, and specifically provides a defrosting control method for a multi-connected air-conditioning unit.
  • Multi-line air conditioning unit is a type of user's central air conditioner, commonly known as “one tow multiple", which refers to an outdoor unit connected to two or more indoor units through piping.
  • the outdoor side adopts air-cooled heat exchange mode
  • the indoor side adopts Primary refrigerant air-conditioning system in the form of direct evaporative heat exchange.
  • Multi-line systems are currently being increasingly used in small and medium-sized buildings and some public buildings.
  • the outdoor unit of the multi-connected air conditioner may be frosted during heating operation.
  • the frosting of the outdoor unit will greatly affect the heating effect of the multi-connected air conditioner. Therefore, the outdoor unit needs to be defrosted.
  • the traditional defrost determination logic uses the ambient temperature on the outdoor side and the defrost temperature on the outdoor side. This determination method is very prone to false defrosting, that is, the outdoor side meets the defrosting conditions but the outdoor unit is not really frosted.
  • the document with the patent number 201811454005.6 discloses an air conditioner defrosting method, which can determine whether the air conditioner is defrosted by the outdoor ambient temperature and the temperature of the outdoor heat exchanger.
  • the indoor temperature and outdoor temperature can be used to determine.
  • the present invention provides a defrosting control method for the multi-line air-conditioning unit.
  • the defrosting control method includes: obtaining the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit during the heating mode of the multi-line air conditioner unit; calculating the indoor unit The difference between the temperature of the air pipe and the temperature of the liquid pipe of the indoor unit; determine whether the multi-connected air conditioner unit meets the predetermined defrosting conditions on the outdoor side; select Ground makes the multi-line air conditioning unit execute the defrost mode.
  • the step of “selectively making the multi-connected air-conditioning unit execute the defrosting mode according to the difference and the determination result of whether the multi-connected air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” specifically includes : If the difference is less than the preset temperature value and the duration reaches the preset time, and the multi-line air conditioner unit meets the predetermined defrosting conditions on the outdoor side, the multi-line air conditioner unit will execute the defrost mode.
  • the step of "selectively making the multi-connected air-conditioning unit execute the defrosting mode based on the difference and the determination result of whether the multi-connected air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” also includes : If the difference is greater than or equal to the preset temperature value, or the difference is less than the preset temperature value but the duration does not reach the preset time, or the multi-line air conditioner unit does not meet the predetermined defrosting conditions on the outdoor side, the multi-line air conditioner unit is not used Perform defrost mode.
  • the step of “selectively making the multi-connected air-conditioning unit execute the defrosting mode according to the difference and the determination result of whether the multi-connected air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” specifically includes : Further obtain the air outlet temperature of the indoor unit; if the difference is less than the first preset temperature value and the duration reaches the first preset time, and the outlet air temperature of the indoor unit is less than the second preset temperature value and the duration reaches the second At a preset time, and the multi-line air conditioner unit meets the predetermined defrosting conditions on the outdoor side, the multi-line air conditioner unit executes the defrost mode.
  • the step of "selectively making the multi-connected air-conditioning unit execute the defrosting mode based on the difference and the determination result of whether the multi-connected air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” also includes : If the difference is greater than or equal to the first preset temperature value, or the difference is less than the first preset temperature value but the duration does not reach the first preset time, or the air outlet temperature of the indoor unit is greater than or equal to the second preset temperature Value, or the outlet air temperature of the indoor unit is less than the second preset temperature value but the duration does not reach the second preset time, or the multi-line air conditioner unit does not meet the predetermined defrosting conditions on the outdoor side, then the multi-line air conditioner unit is not allowed to perform defrosting. Frost pattern.
  • the step of “selectively making the multi-connected air-conditioning unit execute the defrosting mode according to the difference and the determination result of whether the multi-connected air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” specifically includes : Further obtain the fan current of the outdoor unit; if the difference is less than the preset temperature value and the duration reaches the preset time, and the fan current of the outdoor unit continues to increase, and the multi-connected air conditioner unit meets the predetermined defrosting conditions on the outdoor side, the more The on-line air conditioning unit executes the defrost mode.
  • the step of “selectively making the multi-connected air-conditioning unit execute the defrosting mode according to the difference and the determination result of whether the multi-connected air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” specifically includes : If the difference is greater than or equal to the preset temperature value, or the difference is less than the preset temperature value but the duration does not reach the preset time, or the fan current of the outdoor unit does not continue to increase, or the multi-connected air conditioning unit does not meet the preset delimitation on the outdoor side. Under frost conditions, the multi-line air-conditioning unit will not execute the defrosting mode.
  • the step of “selectively making the multi-connected air-conditioning unit execute the defrosting mode according to the difference and the determination result of whether the multi-connected air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” specifically includes : Further obtain the air outlet temperature of the indoor unit and the fan current of the outdoor unit; if the difference is less than the first preset temperature value and the duration reaches the first preset time, and the outlet air temperature of the indoor unit is less than the second preset temperature value And the duration reaches the second preset time, and the fan current of the outdoor unit continues to increase, and the multi-connected air conditioner unit meets the predetermined defrosting condition on the outdoor side, the multi-connected air conditioner unit executes the defrost mode.
  • the step of "selectively making the multi-connected air-conditioning unit execute the defrosting mode based on the difference and the determination result of whether the multi-connected air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” also includes : If the difference is greater than or equal to the first preset temperature value, or the difference is less than the first preset temperature value but the duration does not reach the first preset time, or the air outlet temperature of the indoor unit is greater than or equal to the second preset temperature Value, or the air outlet temperature of the indoor unit is less than the second preset temperature value but the duration does not reach the second preset time, or the fan current of the outdoor unit does not continue to increase, or the multi-connected air conditioning unit does not meet the predetermined defrosting conditions on the outdoor side , The multi-line air conditioner unit will not execute the defrost mode.
  • the predetermined defrosting conditions on the outdoor side include outdoor ambient temperature determination conditions and outdoor defrosting temperature determination conditions.
  • the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit are combined to determine the multi-connection based on the existing outdoor predetermined defrosting conditions. Whether the air conditioning unit is defrosted or not, you can avoid false defrosting by introducing indoor side parameters, and the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit can truly reflect the heating of the multi-connected air conditioning unit compared with the indoor ambient temperature.
  • the accuracy of the defrosting judgment of the multi-connected air conditioning unit can be greatly improved, the false defrosting can be avoided, and the heating effect of the multi-connected air conditioning unit can be removed in time when the heating effect of the multi-connected air conditioning unit really deteriorates. Cream to avoid affecting the user’s experience.
  • Fig. 1 is a flowchart of the first embodiment of the defrosting control method for a multi-connected air conditioning unit of the present invention.
  • the present invention provides a defrosting control method for multi-line air conditioning units, which aims to avoid false defrosting of multi-line air conditioning units. It can improve the accuracy of defrosting judgment, and can truly reflect the heating effect of the multi-connected air conditioning unit, and defrost in time when the heating effect is not good, so as to avoid affecting the user's experience.
  • the multi-line air-conditioning unit of the present invention includes an outdoor unit and a plurality of indoor units connected to the outdoor unit.
  • the multi-line air-conditioning unit also includes solenoid valves, electronic expansion valves, compressors and other components. A repeat.
  • the defrosting control method of the present invention includes: obtaining the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit during the heating mode of the multi-line air conditioner unit; calculating the temperature of the air pipe of the indoor unit and the liquid pipe temperature of the indoor unit Difference; judge whether the multi-line air conditioner unit meets the predetermined defrost condition on the outdoor side; according to the difference and the judgment result of whether the multi-line air conditioner unit meets the predetermined defrost condition on the outdoor side, selectively make the multi-line air conditioner unit execute the defrost mode.
  • obtaining the air pipe temperature and liquid pipe temperature of the indoor unit can be the air pipe temperature and liquid pipe temperature of a certain running indoor unit, or the air pipe temperature and liquid pipe temperature of multiple running indoor units.
  • the average value of air pipe temperature can be calculated based on the air pipe temperature of all indoor units acquired, and the liquid pipe temperature of all acquired indoor units can be calculated. Calculate the average value of the liquid pipe temperature based on the temperature, and then use the difference between the average value of the air pipe temperature and the average value of the liquid pipe temperature as the indoor side parameter for defrosting judgment, or when acquiring the air pipes of multiple running indoor units
  • the difference between the air pipe temperature and the liquid pipe temperature of each running indoor unit can be calculated separately, and then all the differences are compared, and finally the indoor unit with the smallest calculated difference is selected.
  • the difference between the air pipe temperature and the liquid pipe temperature is used as the indoor side parameter for defrosting judgment.
  • Those skilled in the art can flexibly set the specific method and difference value for obtaining the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit in practical applications.
  • the calculation and selection method of, such adjustments and changes do not constitute a limitation to the present invention, and should be limited within the protection scope of the present invention.
  • the step of obtaining the air pipe temperature and the liquid pipe temperature of the indoor unit and calculating the difference may precede the step of judging whether the multi-connected air conditioning unit meets the predetermined defrosting conditions on the outdoor side, or it can be followed by judging whether the multi-connected air conditioning unit meets the predetermined defrosting conditions on the outdoor side.
  • the step of meeting the predetermined defrosting condition on the outdoor side can also be performed at the same time as the step of judging whether the multi-connected air conditioning unit meets the predetermined defrosting condition on the outdoor side. It should be limited within the protection scope of the present invention.
  • the predetermined outdoor defrost conditions may include outdoor ambient temperature determination conditions and outdoor defrost temperature (ie, outdoor unit coil temperature detected by the outdoor defrost sensor) determination conditions, or may only include outdoor ambient temperature determination Conditions, or only include outdoor defrost temperature judgment conditions.
  • the outdoor predetermined defrosting conditions include outdoor ambient temperature determination conditions and outdoor defrosting temperature determination conditions.
  • the specific determination logic may be: when the outdoor ambient temperature Tao is greater than or equal to 4°C and less than or equal to 20°C, and the defrost temperature is less than or equal to -6°C, and the duration reaches 5 minutes; or when the outdoor ambient temperature Tao is greater than or equal to -6°C and less than 4°C, and the defrost temperature is less than or equal to (0.8Tao-8.5 )°C, and the duration reaches 5 minutes; or when the outdoor ambient temperature Tao is greater than or equal to -15°C and less than -6°C, and the defrost temperature is less than or equal to (5Tao-72)/7/1.08°C, and the duration reaches 5 minutes; or when the outdoor ambient temperature Tao is less than -15°C, and the defrosting temperature is less than or equal to -20°C, and the duration reaches 5 minutes, the multi-connected air conditioning unit meets the predetermined defrosting conditions on the outdoor side.
  • the predetermined defrosting condition can also be added to the time judgment condition.
  • the time judgment condition can be 33 minutes of heating start, or the cumulative time from the last defrost to heating operation of 50 minutes, meeting the defrosting time condition, or the above Add the oil return condition on the basis of the time condition, that is, if the defrost temperature is greater than or equal to 10°C and the duration reaches 1 minute, or the defrost temperature is greater than or equal to 15°C and the duration reaches 10 seconds, the above time Reset to zero and restart timing.
  • the aforementioned predetermined defrosting conditions on the outdoor side are only exemplary and do not constitute any limitation to the present invention.
  • the step of “selectively make the multi-line air conditioner unit execute the defrost mode based on the difference and the determination result of whether the multi-line air conditioner unit meets the predetermined defrosting condition on the outdoor side” specifically includes: If the temperature is less than the preset temperature value and the duration reaches the preset time, and the multi-line air conditioner unit meets the predetermined defrosting conditions on the outdoor side, the multi-line air conditioner unit will execute the defrost mode; if the difference is greater than or equal to the preset temperature value, or the difference If the value is less than the preset temperature value but the duration does not reach the preset time, or the multi-line air conditioner unit does not meet the predetermined defrosting conditions on the outdoor side, the multi-line air conditioner unit is not allowed to execute the defrost mode.
  • the multi-line air conditioner unit When the difference between the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit is less than the preset temperature value and the duration reaches the preset time, and the multi-line air conditioner unit meets the predetermined defrosting conditions on the outdoor side, it indicates the heating of the multi-line air conditioner unit The effect becomes worse due to the frosting of the outdoor unit. At this time, the subsequent heating effect can be improved by defrosting the outdoor unit.
  • the difference between the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit is greater than or equal to the preset temperature value, or the difference is less than the preset temperature value but the duration does not reach the preset time, or the multi-connected air conditioning unit does not meet the requirements of the outdoor side
  • the defrosting conditions it means that the outdoor unit of the multi-connected air conditioning unit is not frosted, and defrosting is not necessary at this time.
  • the preset temperature value can be set to 12°C, and the preset time can be set to 3 minutes.
  • the aforementioned preset temperature value and preset time are only exemplary, and do not constitute an impact on the present invention. Those skilled in the art can flexibly set the specific values of the preset temperature value and the preset time in practical applications.
  • the aforementioned step of "selectively making the multi-line air-conditioning unit execute the defrosting mode based on the difference and the determination result of whether the multi-line air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” specifically includes: further obtaining the air outlet temperature of the indoor unit; If the difference is less than the first preset temperature value and the duration reaches the first preset time, and the air outlet temperature of the indoor unit is less than the second preset temperature value and the duration reaches the second preset time, and the multi-connected air conditioner meets The predetermined defrost condition on the outdoor side causes the multi-connected air conditioner unit to execute the defrost mode; if the difference is greater than or equal to the first preset temperature value, or the difference is less than the first preset temperature value but the duration does not reach the first preset Time, or the outlet air temperature of the indoor unit is greater than or equal to the second preset temperature value, or the outlet air temperature of the indoor unit is less than the second preset temperature value but the duration does not reach the second prese
  • the accuracy of the defrosting judgment can be further improved, that is, when the difference between the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit is less than the first preset temperature value and the duration reaches the first
  • the preset time and the outlet air temperature of the indoor unit is less than the second preset temperature value and the duration reaches the second preset time, and the multi-line air conditioner unit meets the predetermined defrosting conditions on the outdoor side
  • the heating of the multi-line air conditioner unit is explained The effect becomes worse due to the frosting of the outdoor unit. At this time, the subsequent heating effect can be improved by defrosting the outdoor unit.
  • the difference between the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit is greater than or equal to the first preset temperature value, or the difference is less than the first preset temperature value but the duration does not reach the first preset time, or the indoor unit
  • the outlet air temperature is greater than or equal to the second preset temperature value, or the outlet air temperature of the indoor unit is less than the second preset temperature value but the duration does not reach the second preset time, or the multi-line air conditioning unit does not meet the outdoor side preset In the frost condition, it means that the outdoor unit of the multi-line air conditioning unit is not frosted, and defrosting is not necessary at this time.
  • the first preset temperature value can be set to 12°C
  • the first preset time can be set to 3 minutes
  • the second preset temperature value can be set to 25°C
  • the second preset temperature value can be set to 25°C.
  • the time can be set to 5 minutes.
  • the above-mentioned first preset temperature value, second preset temperature value, first preset time, and second preset time are only exemplary and do not constitute any limitation to the present invention. Those skilled in the art can flexibly set specific values of the first preset temperature value, the second preset temperature value, the first preset time, and the second preset time in practical applications.
  • the aforementioned step of "selectively make the multi-line air-conditioning unit execute the defrosting mode based on the difference and whether the multi-line air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” specifically includes: further obtaining the fan current of the outdoor unit; if If the difference is less than the preset temperature value and the duration reaches the preset time, and the fan current of the outdoor unit continues to increase, and the multi-line air conditioner unit meets the predetermined defrosting conditions on the outdoor side, the multi-line air conditioner unit will execute the defrost mode; The value is greater than or equal to the preset temperature value, or the difference is less than the preset temperature value but the duration does not reach the preset time, or the fan current of the outdoor unit does not continue to increase, or the multi-connected air conditioning unit does not meet the predetermined defrosting conditions on the outdoor side, Do not make the multi-line air conditioning unit execute the defrost mode.
  • the accuracy of the defrost judgment can be further improved.
  • the fan current of the outdoor unit can be compared with the fan current of the outdoor unit before (for example, 5 minutes ago) to determine the fan current of the outdoor unit Whether it continues to increase, if it continues to increase, it is determined that the outdoor unit's air supply resistance has increased, and it is determined that the outdoor unit has frost.
  • the multi-line air conditioning unit meets the predetermined defrosting on the outdoor side
  • the heating effect of the multi-connected air conditioning unit is deteriorated due to the frosting of the outdoor unit.
  • the subsequent heating effect can be improved by defrosting the outdoor unit.
  • the difference between the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit is greater than or equal to the preset temperature value, or the difference is less than the preset temperature value but the duration does not reach the preset time, or the fan current of the outdoor unit does not continue to increase , Or when the multi-line air conditioner unit does not meet the predetermined defrosting conditions on the outdoor side, it means that the outdoor unit of the multi-line air conditioner unit is not frosted, and defrosting is not necessary at this time.
  • the preset temperature value can be set to 12°C, and the preset time can be set to 3 minutes.
  • the aforementioned preset temperature value and preset time are only exemplary, and do not constitute an impact on the present invention. Those skilled in the art can flexibly set the specific values of the preset temperature value and the preset time in practical applications.
  • the step of "selectively making the multi-line air-conditioning unit execute the defrost mode based on the difference and whether the multi-line air-conditioning unit meets the predetermined defrosting conditions on the outdoor side” specifically includes: further obtaining the air outlet temperature and The fan current of the outdoor unit; if the difference is less than the first preset temperature value and the duration reaches the first preset time, and the outlet air temperature of the indoor unit is less than the second preset temperature value and the duration reaches the second preset time, And the fan current of the outdoor unit continues to increase, and the multi-line air conditioner unit meets the predetermined defrosting conditions on the outdoor side, the multi-line air conditioner unit is executed in the defrost mode; if the difference is greater than or equal to the first preset temperature value, or the difference is less than The first preset temperature value but the duration does not reach the first preset time, or the outlet air temperature of the indoor unit is greater than or equal to the second preset temperature value, or the outlet air temperature of the indoor unit is
  • the accuracy of the defrost judgment can be further improved.
  • the fan current of the outdoor unit can be compared with the fan current of the outdoor unit before (for example, 5 minutes ago) , Determine whether the fan current of the outdoor unit continues to increase, if it continues to increase, it is determined that the air supply resistance of the outdoor unit has increased, and it is determined that the outdoor unit has frost.
  • the indoor unit When the difference between the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit is greater than or equal to the first preset temperature value, or the difference is less than the first preset temperature value but the duration does not reach the first preset time, or the indoor unit
  • the outlet air temperature of is greater than or equal to the second preset temperature value, or the outlet air temperature of the indoor unit is less than the second preset temperature value but the duration does not reach the second preset time, or the fan current of the outdoor unit does not continue to increase, or
  • the multi-line air-conditioning unit does not meet the predetermined defrosting conditions on the outdoor side, it means that the outdoor unit of the multi-line air-conditioning unit is not frosted, and defrosting is not necessary at this time.
  • the preset temperature value can be set to 12°C, and the preset time can be set to 3 minutes.
  • the aforementioned preset temperature value and preset time are only exemplary, and do not constitute an impact on the present invention. Those skilled in the art can flexibly set the specific values of the preset temperature value and the preset time in practical applications.
  • the indoor unit is used as a condenser, and the refrigerant in the air pipe of the indoor unit enters the indoor unit coil and flows out into the liquid pipe of the indoor unit At this time, the gaseous refrigerant becomes liquid refrigerant due to the heat of liquefaction. Therefore, the temperature of the air pipe of the indoor unit is higher than the temperature of the liquid pipe of the indoor unit.

Abstract

一种多联机空调机组的除霜控制方法，包括：在多联机空调机组执行制热模式的过程中，获取室内机的气管温度和室内机的液管温度；计算室内机的气管温度与室内机的液管温度的差值；判断多联机空调机组是否满足室外侧预定除霜条件；根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式。本发明能够避免多联机空调机组出现假除霜的情况，提高除霜判断的准确性，还能够反映多联机空调机组的制热效果，在制热效果不佳时及时进行除霜。

Description

多联机空调机组的除霜控制方法 技术领域
本发明属于空调机组技术领域，具体提供一种多联机空调机组的除霜控制方法。
背景技术
多联机空调机组是用户中央空调的一个类型，俗称”一拖多”，指的是一台室外机通过配管连接两台或两台以上室内机，室外侧采用风冷换热形式、室内侧采用直接蒸发换热形式的一次制冷剂空调系统。多联机系统目前在中小型建筑和部分公共建筑中得到日益广泛的应用。
现有技术中，多联机空调机组在制热运行过程中室外机有可能会结霜，室外机结霜会极大地影响多联机空调机组的制热效果，因此需要对室外机进行除霜。传统的除霜判定逻辑采用的是室外侧的环境温度和室外侧的除霜温度，这种判定方式非常容易出现假除霜的方式，即室外侧满足除霜条件然而室外机并未真正结霜。
专利号为201811454005.6的文献公开了一种空调除霜方法，其可以通过室外环境温度和室外换热器的温度来判定空调是否进行除霜，在除霜模式的选择上(即是采用热气除霜还是采用换向除霜)可以采用室内温度和室外温度来进行判定，然而，用户家中可能还有其他加热设备，例如冬天用户家中会使用水暖气或者电暖气等，室内环境温度无法真实反映空调的制热情况，在除霜判定的准确性上仍然具有一定的缺陷。
因此，本领域需要一种新的多联机空调机组的除霜控制方法来解决上述问题。
发明内容
为了解决现有技术中的上述问题，即为了解决现有多联机空调机组的除霜判定准确性不高的问题，本发明提供了一种多联机空调机 组的除霜控制方法，多联机空调机组包括室外机和与室外机相连的多个室内机，除霜控制方法包括：在多联机空调机组执行制热模式的过程中，获取室内机的气管温度和室内机的液管温度；计算室内机的气管温度与室内机的液管温度的差值；判断多联机空调机组是否满足室外侧预定除霜条件；根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式。
在除霜控制方法上述的优选技术方案中，“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤具体包括：如果差值小于预设温度值且持续时间达到预设时间，并且多联机空调机组满足室外侧预定除霜条件，则使多联机空调机组执行除霜模式。
在除霜控制方法上述的优选技术方案中，“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤还包括：如果差值大于或等于预设温度值，或者差值小于预设温度值但持续时间未达到预设时间，或者多联机空调机组不满足室外侧预定除霜条件，则不使多联机空调机组执行除霜模式。
在除霜控制方法上述的优选技术方案中，“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤具体包括：进一步获取室内机的出风温度；如果差值小于第一预设温度值且持续时间达到第一预设时间，并且室内机的出风温度小于第二预设温度值且持续时间达到第二预设时间，并且多联机空调机组满足室外侧预定除霜条件，则使多联机空调机组执行除霜模式。
在除霜控制方法上述的优选技术方案中，“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤还包括：如果差值大于或等于第一预设温度值，或者差值小于第一预设温度值但持续时间未达到第一预设时间，或者室内机的出风温度大于或等于第二预设温度值，或者室内机的出风温度小于第二预设温度值但持续时间未达到第二预设时间，或者 多联机空调机组不满足室外侧预定除霜条件，则不使多联机空调机组执行除霜模式。
在除霜控制方法上述的优选技术方案中，“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤具体包括：进一步获取室外机的风机电流；如果差值小于预设温度值且持续时间达到预设时间，并且室外机的风机电流持续增加，并且多联机空调机组满足室外侧预定除霜条件，则使多联机空调机组执行除霜模式。
在除霜控制方法上述的优选技术方案中，“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤具体包括：如果差值大于或等于预设温度值，或者差值小于预设温度值但持续时间未达到预设时间，或者室外机的风机电流未持续增加，或者多联机空调机组不满足室外侧预定除霜条件，则不使多联机空调机组执行除霜模式。
在除霜控制方法上述的优选技术方案中，“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤具体包括：进一步获取室内机的出风温度和室外机的风机电流；如果差值小于第一预设温度值且持续时间达到第一预设时间，并且室内机的出风温度小于第二预设温度值且持续时间达到第二预设时间，并且室外机的风机电流持续增加，并且多联机空调机组满足室外侧预定除霜条件，则使多联机空调机组执行除霜模式。
在除霜控制方法上述的优选技术方案中，“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤还包括：如果差值大于或等于第一预设温度值，或者差值小于第一预设温度值但持续时间未达到第一预设时间，或者室内机的出风温度大于或等于第二预设温度值，或者室内机的出风温度小于第二预设温度值但持续时间未达到第二预设时间，或者室外机的风机电流未持续增加，或者多联机空调机组不满足室外侧预定除霜条件，则不使多联机空调机组执行除霜模式。
在除霜控制方法上述的优选技术方案中，室外侧预定除霜条件包括室外环境温度判定条件和室外除霜温度判定条件。
本领域技术人员能够理解的是，在本发明的优选技术方案中，通过在现有的室外侧预定除霜条件的基础上引入室内机的气管温度和室内机的液管温度进行组合判断多联机空调机组是否除霜，可以通过引入室内侧参数来避免出现假除霜的情况，且室内机的气管温度和室内机的液管温度相较于室内环境温度能够真实反映多联机空调机组的制热情况，通过这样的控制方式，可以极大地提高多联机空调机组除霜判断的准确性，避免出现假除霜的情况，且能够在多联机空调机组的制热效果真的变差后及时进行除霜，避免影响用户的使用体验。
附图说明
图1是本发明的多联机空调机组的除霜控制方法实施例一的流程图。
具体实施方式
下面参照附图来描述本发明的优选实施方式。本领域技术人员应当理解的是，这些实施方式仅仅用于解释本发明的技术原理，并非旨在限制本发明的保护范围。
需要说明的是，在本发明的描述中，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。
此外，还需要说明的是，在本发明的描述中，除非另有明确的规定和限定，术语“设置”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域技术人员而言，可根据具体情况理解上述术语在本发明中的具体含义。
基于背景技术指出的现有多联机空调机组的除霜判定准确性不高的问题，本发明提供了一种多联机空调机组的除霜控制方法，旨在避免多联机空调机组出现假除霜的情况，提高除霜判断的准确性，且能够真实地反映多联机空调机组的制热效果，在制热效果不佳时及时进行除霜，避免影响用户的使用体验。
具体地，本发明的多联机空调机组包括室外机和与室外机相连的多个室内机，当然，多联机空调机组还包括电磁阀、电子膨胀阀、压缩机等其它部件，在此就不一一赘述。本发明的除霜控制方法包括：在多联机空调机组执行制热模式的过程中，获取室内机的气管温度和室内机的液管温度；计算室内机的气管温度与室内机的液管温度的差值；判断多联机空调机组是否满足室外侧预定除霜条件；根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式。需要说明的是，获取室内机的气管温度和室内机的液管温度可以是获取某一个正在运行的室内机的气管温度和液管温度，或者获取多个正在运行的室内机的气管温度和液管温度，当获取多个正在运行的室内机的气管温度和液管温度时，可以基于所有获取到的室内机的气管温度计算其气管温度平均值，以及基于所有获取到的室内机的液管温度计算其液管温度平均值，然后再基于该气管温度平均值和液管温度平均值的差值来作为除霜判断的室内侧参数，又或者，当获取多个正在运行的室内机的气管温度和液管温度时，可以分别计算每个正在运行的室内机的气管温度和液管温度的差值，然后将所有差值进行对比，最终选择计算得到的差值最小的那一个室内机的气管温度与液管温度的差值来作为除霜判断的室内侧参数，本领域技术人员可以在实际应用中灵活地设置获取室内机的气管温度和室内机的液管温度的具体方式以及差值的计算以及选定方式，这种调整和改变都不构成对本发明的限制，均应限定在本发明的保护范围之内。
需要说明的是，获取室内机的气管温度和液管温度并计算差值的步骤可以先于判断多联机空调机组是否满足室外侧预定除霜条件的步骤，也可以后于判断多联机空调机组是否满足室外侧预定除霜条件的步骤，还可以与判断多联机空调机组是否满足室外侧预定除霜条件的步骤同时进行，这种对于步骤执行次序的调整和改变也不构成对本发明的限制，均应限定在本发明的保护范围之内。
在上述中，室外侧预定除霜条件可以包括室外环境温度判定条件和室外除霜温度(即室外侧除霜传感器检测到的室外机盘管的温度)判定条件，还可以仅包括室外环境温度判定条件，又或者仅包括室外除霜温度判定条件。例如，在一种可能的情形中，室外侧预定除霜条件包 括室外环境温度判定条件和室外除霜温度判定条件，具体判定逻辑可以为：当室外环境温度Tao大于或等于4℃且小于或等于20℃，并且除霜温度小于或等于-6℃，并且持续时间达到5分钟；或者当室外环境温度Tao大于或等于-6℃且小于4℃，并且除霜温度小于或等于(0.8Tao-8.5)℃，并且持续时间达到5分钟；或者当室外环境温度Tao大于或等于-15℃且小于-6℃，并且除霜温度小于或等于(5Tao-72)/7/1.08℃，并且持续时间达到5分钟；或者当室外环境温度Tao小于-15℃，并且除霜温度小于或等于-20℃，并且持续时间达到5分钟时，多联机空调机组满足室外侧预定除霜条件，当然，上述室外侧预定除霜条件中还可以加入时间判定条件，时间判定条件可以为制热启动达33分钟，或者上一次除霜到制热运行累计时间达50分钟，满足除霜的时间条件，又或者在上述时间条件的基础上再加入回油条件，即回油运行中如果除霜温度大于或等于10℃且持续时间达到1分钟，或者除霜温度大于或等于15℃且持续时间达到10秒，上述时间清零重新开始计时。需要说明的是，上述室外侧预定除霜条件仅是示例性的，并不构成对本发明的任何限制。
下面通过多个优选的实施例来进一步阐述本发明的技术方案。
实施例一
如图1所示，前述中“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤具体包括：如果差值小于预设温度值且持续时间达到预设时间，并且多联机空调机组满足室外侧预定除霜条件，则使多联机空调机组执行除霜模式；如果差值大于或等于预设温度值，或者差值小于预设温度值但持续时间未达到预设时间，或者多联机空调机组不满足室外侧预定除霜条件，则不使多联机空调机组执行除霜模式。当室内机的气管温度和室内机的液管温度的差值小于预设温度值且持续时间达到预设时间，并且多联机空调机组满足室外侧预定除霜条件，说明多联机空调机组的制热效果由于室外机结霜而变差，此时通过对室外机除霜能够改善后续的制热效果。当室内机的气管温度和室内机的液管温度的差值大于或等于预设温度值，或者差值小于预设温度值但持续时间未达到预 设时间，或者多联机空调机组不满足室外侧预定除霜条件时，说明多联机空调机组的室外机并未结霜，此时可以不用进行除霜。
在一种具体的情形中，预设温度值可以设定为12℃，预设时间可以设定为3分钟，当然，上述预设温度值和预设时间仅是示例性的，不构成对本发明的任何限制，本领域技术人员可以在实际应用中灵活地设置预设温度值和预设时间的具体值。
实施例二
前述中“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤具体包括：进一步获取室内机的出风温度；如果差值小于第一预设温度值且持续时间达到第一预设时间，并且室内机的出风温度小于第二预设温度值且持续时间达到第二预设时间，并且多联机空调机组满足室外侧预定除霜条件，则使多联机空调机组执行除霜模式；如果差值大于或等于第一预设温度值，或者差值小于第一预设温度值但持续时间未达到第一预设时间，或者室内机的出风温度大于或等于第二预设温度值，或者室内机的出风温度小于第二预设温度值但持续时间未达到第二预设时间，或者多联机空调机组不满足室外侧预定除霜条件，则不使多联机空调机组执行除霜模式。通过进一步引入室内机的出风温度，可以进一步提高除霜判断的准确性，即当室内机的气管温度和室内机的液管温度的差值小于第一预设温度值且持续时间达到第一预设时间，并且室内机的出风温度小于第二预设温度值且持续时间达到第二预设时间，并且多联机空调机组满足室外侧预定除霜条件时，说明多联机空调机组的制热效果由于室外机结霜而变差，此时通过对室外机除霜能够改善后续的制热效果。当室内机的气管温度和室内机的液管温度的差值大于或等于第一预设温度值，或者差值小于第一预设温度值但持续时间未达到第一预设时间，或者室内机的出风温度大于或等于第二预设温度值，或者室内机的出风温度小于第二预设温度值但持续时间未达到第二预设时间，或者多联机空调机组不满足室外侧预定除霜条件时，说明多联机空调机组的室外机并未结霜，此时可以不用进行除霜。
在一种具体的情形中，第一预设温度值可以设定为12℃，第一预设时间可以设定为3分钟，第二预设温度值可以设定为25℃，第 二预设时间可以设定为5分钟，当然，上述第一预设温度值、第二预设温度值、第一预设时间和第二预设时间仅是示例性的，不构成对本发明的任何限制，本领域技术人员可以在实际应用中灵活地设置第一预设温度值、第二预设温度值、第一预设时间和第二预设时间的具体值。
实施例三
前述中“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤具体包括：进一步获取室外机的风机电流；如果差值小于预设温度值且持续时间达到预设时间，并且室外机的风机电流持续增加，并且多联机空调机组满足室外侧预定除霜条件，则使多联机空调机组执行除霜模式；如果差值大于或等于预设温度值，或者差值小于预设温度值但持续时间未达到预设时间，或者室外机的风机电流未持续增加，或者多联机空调机组不满足室外侧预定除霜条件，则不使多联机空调机组执行除霜模式。通过进一步引入室外机的风机电流，可以进一步提高除霜判断的准确性，具体为可以将室外机的风机电流与之前(例如5分钟前)的室外机的风机电流比较，判断室外机的风机电流是否持续增加，若持续增加，则判定为室外机送风阻力变大，判定为室外机有结霜。即，当室内机的气管温度与室内机的液管温度差值小于预设温度值且持续时间达到预设时间，并且室外机的风机电流持续增加，并且多联机空调机组满足室外侧预定除霜条件时，说明多联机空调机组的制热效果由于室外机结霜而变差，此时通过对室外机除霜能够改善后续的制热效果。当室内机的气管温度与室内机的液管温度的差值大于或等于预设温度值，或者差值小于预设温度值但持续时间未达到预设时间，或者室外机的风机电流未持续增加，或者多联机空调机组不满足室外侧预定除霜条件时，说明多联机空调机组的室外机并未结霜，此时可以不用进行除霜。
在一种具体的情形中，预设温度值可以设定为12℃，预设时间可以设定为3分钟，当然，上述预设温度值和预设时间仅是示例性的，不构成对本发明的任何限制，本领域技术人员可以在实际应用中灵活地设置预设温度值和预设时间的具体值。
实施例四
前述中“根据差值以及多联机空调机组是否满足室外侧预定除霜条件的判定结果，选择性地使多联机空调机组执行除霜模式”的步骤具体包括：进一步获取室内机的出风温度和室外机的风机电流；如果差值小于第一预设温度值且持续时间达到第一预设时间，并且室内机的出风温度小于第二预设温度值且持续时间达到第二预设时间，并且室外机的风机电流持续增加，并且多联机空调机组满足室外侧预定除霜条件，则使多联机空调机组执行除霜模式；如果差值大于或等于第一预设温度值，或者差值小于第一预设温度值但持续时间未达到第一预设时间，或者室内机的出风温度大于或等于第二预设温度值，或者室内机的出风温度小于第二预设温度值但持续时间未达到第二预设时间，或者室外机的风机电流未持续增加，或者多联机空调机组不满足室外侧预定除霜条件，则不使多联机空调机组执行除霜模式。通过进一步引入室内机的出风温度和室外机的风机电流，可以进一步提高除霜判断的准确性，具体为可以将室外机的风机电流与之前(例如5分钟前)的室外机的风机电流比较，判断室外机的风机电流是否持续增加，若持续增加，则判定为室外机送风阻力变大，判定为室外机有结霜。即，当室内机的气管温度与室内机的液管温度的差值小于第一预设温度值且持续时间达到第一预设时间，并且室内机的出风温度小于第二预设温度值且持续时间达到第二预设时间，并且室外机的风机电流持续增加，并且多联机空调机组满足室外侧预定除霜条件时，说明多联机空调机组的制热效果由于室外机结霜而变差，此时通过对室外机除霜能够改善后续的制热效果。当室内机的气管温度与室内机的液管温度的差值大于或等于第一预设温度值，或者差值小于第一预设温度值但持续时间未达到第一预设时间，或者室内机的出风温度大于或等于第二预设温度值，或者室内机的出风温度小于第二预设温度值但持续时间未达到第二预设时间，或者室外机的风机电流未持续增加，或者多联机空调机组不满足室外侧预定除霜条件时，说明多联机空调机组的室外机并未结霜，此时可以不用进行除霜。
在一种具体的情形中，预设温度值可以设定为12℃，预设时间可以设定为3分钟，当然，上述预设温度值和预设时间仅是示例性的，不构成对本发明的任何限制，本领域技术人员可以在实际应用中灵活地设置预设温度值和预设时间的具体值。
需要说明的是，在本发明中，在多联机空调机组制热运行的过程中，室内机作为冷凝器使用，室内机的气管中的冷媒进入室内机盘管后流出到室内机的液管中，此时气态冷媒由于液化放热变为液态冷媒，因此，室内机的气管温度高于室内机的液管温度。
至此，已经结合附图所示的优选实施方式描述了本发明的技术方案，但是，本领域技术人员容易理解的是，本发明的保护范围显然不局限于这些具体实施方式。在不偏离本发明的原理的前提下，本领域技术人员可以对相关技术特征作出等同的更改或替换，这些更改或替换之后的技术方案都将落入本发明的保护范围之内。

Claims (10)

  1. 一种多联机空调机组的除霜控制方法，其特征在于，所述多联机空调机组包括室外机和与所述室外机相连的多个室内机，所述除霜控制方法包括：
    在所述多联机空调机组执行制热模式的过程中，获取所述室内机的气管温度和所述室内机的液管温度；
    计算所述室内机的气管温度与所述室内机的液管温度的差值；
    判断所述多联机空调机组是否满足室外侧预定除霜条件；
    根据所述差值以及所述多联机空调机组是否满足所述室外侧预定除霜条件的判定结果，选择性地使所述多联机空调机组执行除霜模式。
  2. 根据权利要求1所述的除霜控制方法，其特征在于，“根据所述差值以及所述多联机空调机组是否满足所述室外侧预定除霜条件的判定结果，选择性地使所述多联机空调机组执行除霜模式”的步骤具体包括：
    如果所述差值小于预设温度值且持续时间达到预设时间，并且所述多联机空调机组满足所述室外侧预定除霜条件，则使所述多联机空调机组执行除霜模式。
  3. 根据权利要求2所述的除霜控制方法，其特征在于，“根据所述差值以及所述多联机空调机组是否满足所述室外侧预定除霜条件的判定结果，选择性地使所述多联机空调机组执行除霜模式”的步骤还包括：
    如果所述差值大于或等于所述预设温度值，或者所述差值小于所述预设温度值但持续时间未达到所述预设时间，或者所述多联机空调机组不满足所述室外侧预定除霜条件，则不使所述多联机空调机组执行除霜模式。
  4. 根据权利要求1所述的除霜控制方法，其特征在于，“根据所述差值以及所述多联机空调机组是否满足所述室外侧预定除霜条件的判定结果，选择性地使所述多联机空调机组执行除霜模式”的步骤具体包括：
    进一步获取所述室内机的出风温度；
    如果所述差值小于第一预设温度值且持续时间达到第一预设时间，并且所述室内机的出风温度小于第二预设温度值且持续时间达到第二预设时间，并且所述多联机空调机组满足所述室外侧预定除霜条件，则使所述多联机空调机组执行除霜模式。
  5. 根据权利要求4所述的除霜控制方法，其特征在于，“根据所述差值以及所述多联机空调机组是否满足所述室外侧预定除霜条件的判定结果，选择性地使所述多联机空调机组执行除霜模式”的步骤还包括：
    如果所述差值大于或等于所述第一预设温度值，或者所述差值小于所述第一预设温度值但持续时间未达到所述第一预设时间，或者所述室内机的出风温度大于或等于所述第二预设温度值，或者所述室内机的出风温度小于所述第二预设温度值但持续时间未达到所述第二预设时间，或者所述多联机空调机组不满足所述室外侧预定除霜条件，则不使所述多联机空调机组执行除霜模式。
  6. 根据权利要求1所述的除霜控制方法，其特征在于，“根据所述差值以及所述多联机空调机组是否满足所述室外侧预定除霜条件的判定结果，选择性地使所述多联机空调机组执行除霜模式”的步骤具体包括：
    进一步获取室外机的风机电流；
    如果所述差值小于预设温度值且持续时间达到预设时间，并且所述室外机的风机电流持续增加，并且所述多联机空调机组满足所述室外侧预定除霜条件，则使所述多联机空调机组执行除霜模式。
  7. 根据权利要求6所述的除霜控制方法，其特征在于，“根据所述差值以及所述多联机空调机组是否满足所述室外侧预定除霜条件的判定结果，选择性地使所述多联机空调机组执行除霜模式”的步骤具体包括：
    如果所述差值大于或等于所述预设温度值，或者所述差值小于所述预设温度值但持续时间未达到所述预设时间，或者所述室外机的风机电流未持续增加，或者所述多联机空调机组不满足所述室外侧预定除霜条件，则不使所述多联机空调机组执行除霜模式。
  8. 根据权利要求1所述的除霜控制方法，其特征在于，“根据所述差值以及所述多联机空调机组是否满足所述室外侧预定除霜条件的判定结果，选择性地使所述多联机空调机组执行除霜模式”的步骤具体包括：
    进一步获取所述室内机的出风温度和所述室外机的风机电流；
    如果所述差值小于第一预设温度值且持续时间达到第一预设时间，并且所述室内机的出风温度小于第二预设温度值且持续时间达到第二预设时间，并且所述室外机的风机电流持续增加，并且所述多联机空调机组满足所述室外侧预定除霜条件，则使所述多联机空调机组执行除霜模式。
  9. 根据权利要求8所述的除霜控制方法，其特征在于，“根据所述差值以及所述多联机空调机组是否满足所述室外侧预定除霜条件的判定结果，选择性地使所述多联机空调机组执行除霜模式”的步骤还包括：
    如果所述差值大于或等于所述第一预设温度值，或者所述差值小于所述第一预设温度值但持续时间未达到所述第一预设时间，或者所述室内机的出风温度大于或等于所述第二预设温度值，或者所述室内机的出风温度小于所述第二预设温度值但持续时间未达到所述第二预设时间，或者所述室外机的风机电流未持续增加，或者所述多联机空调机组不满足所述室外侧预定除霜条件，则不使所述多联机空调机组执行除霜模式。
  10. 根据权利要求1至9中任一项所述的除霜控制方法，其特征在于，所述室外侧预定除霜条件包括室外环境温度判定条件和室外除霜温度判定条件。
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