CN108954712B - Control method and control system of air conditioner and air conditioner - Google Patents

Control method and control system of air conditioner and air conditioner Download PDF

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Publication number
CN108954712B
CN108954712B CN201810814714.4A CN201810814714A CN108954712B CN 108954712 B CN108954712 B CN 108954712B CN 201810814714 A CN201810814714 A CN 201810814714A CN 108954712 B CN108954712 B CN 108954712B
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preset
degree
expansion valve
electronic expansion
fresh air
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CN108954712A (en
Inventor
舒文涛
许永锋
梁伯启
李波
万永强
陈汝锋
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/50—Load

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a control method and a control system of an air conditioner and the air conditioner, wherein the air conditioner comprises an indoor unit and a fresh air machine, and the control method comprises the following steps: acquiring a fresh air load value of a fresh air fan and a total load value of an air conditioner; calculating the ratio of the fresh air load value to the total load value; and controlling the opening degree of an electronic expansion valve of the indoor unit and/or the fresh air fan according to the preset range of the ratio and the current operation mode of the air conditioner. According to the control method of the air conditioner, the ratio of the fresh air load value to the total load value is calculated, the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air fan is controlled according to the preset range corresponding to the ratio and the current operation mode of the air conditioner, and therefore the electronic expansion valves of the indoor unit and the fresh air fan are respectively controlled on the basis of the actual operation condition of the fresh air fan, so that the effect of providing fresh air with proper temperature for the indoor environment can be achieved, and meanwhile, the problem that the temperature adjusting effect of the indoor unit is poor due to the fact that excessive refrigerants enter the fresh air fan can be avoided.

Description

Control method and control system of air conditioner and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioner, a control system of the air conditioner and the air conditioner.
Background
In the actual installation and use process of the multi-connected fresh air conditioning unit, an installation mode exists in which an inner machine of a fresh air fan is independently connected with an outdoor machine; there is also a case where the indoor unit of the new blower is mixed with the ordinary indoor unit and then installed with the outdoor unit. Because the fresh air unit inner unit mainly provides fresh air indoors, and the ordinary indoor unit mainly adjusts the indoor temperature, if the two are controlled by the electronic expansion valve according to the same parameters and methods, the effect is not good due to too few refrigerants of the ordinary indoor unit, and the energy waste is caused due to too many refrigerants of the fresh air unit flowing through, so that the comfort of the whole air conditioning system is reduced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
To this end, according to an embodiment of a first aspect of the present invention, the present invention proposes a control method of an air conditioner.
According to a second aspect of the embodiment of the invention, the invention provides a control system of an air conditioner.
According to a third aspect of the present invention, there is provided an air conditioner.
In view of the above, according to a first aspect of the present invention, the present invention provides a control method for an air conditioner, where the air conditioner includes an indoor unit and a fresh air blower, and the control method includes: acquiring a fresh air load value of a fresh air fan and a total load value of an air conditioner; calculating the ratio of the fresh air load value to the total load value; and controlling the opening degree of an electronic expansion valve of the indoor unit and/or the fresh air fan according to the preset range of the ratio and the current operation mode of the air conditioner.
According to the control method of the air conditioner, the ratio of the fresh air load value to the total load value is calculated, the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air fan is controlled according to the preset range corresponding to the ratio and the current operation mode of the air conditioner, so that the electronic expansion valves of the indoor unit and the fresh air fan are respectively controlled on the basis of the actual operation condition of the fresh air fan, the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air fan is more reasonable, the operation effect of the whole air conditioning system is improved, the effect of providing fresh air with proper temperature for the indoor environment can be achieved, and meanwhile the poor temperature adjusting effect of the indoor unit caused by the fact that excessive refrigerants enter the fresh air fan can be avoided.
In addition, the control method of the air conditioner in the above embodiment provided by the present invention may further have the following additional technical features:
in the above technical solution, preferably, the method further includes: acquiring the outlet temperature of a heat exchanger of an air conditioner; calculating the current superheat degree or the current supercooling degree of the heat exchanger according to the outlet temperature and the corresponding saturation temperature of the heat exchanger; and adjusting the opening degree of the electronic expansion valve until the current superheat degree or the current supercooling degree reaches a preset superheat degree or a preset supercooling degree.
In the technical scheme, the saturation temperature corresponding to the heat exchanger is obtained through the outlet temperature of the heat exchanger, the supercooling degree of the outlet of the heat exchanger or the superheat degree of the outlet of the heat exchanger is calculated, the opening degree of the electronic expansion valve is gradually adjusted, the supercooling degree of the outlet of the heat exchanger approaches to the preset supercooling degree, the supercooling degree of the outlet of the heat exchanger is finally enabled to be equal to the preset supercooling degree, or the superheat degree of the outlet of the heat exchanger approaches to the preset superheat degree, and the superheat degree of the outlet of the heat exchanger is finally enabled to be equal to the preset superheat degree, so that the indoor.
In any of the above technical solutions, preferably, the step of controlling the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air blower according to the preset range of the ratio and the current operation mode of the air conditioner specifically includes: when the ratio is greater than a first preset threshold value and less than or equal to a second preset threshold value, under the refrigeration mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a second preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a second preset supercooling degree; the second preset threshold is larger than the first preset threshold, the second preset superheat degree is equal to the sum of the first preset superheat degree and a first preset superheat degree difference, and the second preset subcooling degree is equal to the sum of the first preset subcooling degree and a first preset subcooling degree difference.
In the technical scheme, when the air conditioner operates in a refrigeration mode, if the ratio is greater than a first preset threshold and less than or equal to a second preset threshold, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset superheat degree, and the opening degree of the electronic expansion valve of a fresh air fan is adjusted according to the first preset superheat degree and a first preset superheat degree difference; when the air conditioner operates in a heating mode, if the ratio is greater than a first preset threshold value and less than or equal to a second preset threshold value, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of the electronic expansion valve of a fresh air fan is adjusted according to the first preset supercooling degree and a first preset supercooling degree difference value, wherein the first preset threshold value is less than the second preset threshold value. When the ratio is larger than a first preset threshold value, the load proportion of the new fan in the multi-split air conditioner system is too large, corresponding limitation needs to be carried out on the load proportion, and the opening or closing of the electronic expansion valve of the indoor unit is determined by calculating the superheat degree or the supercooling degree of the outlet of the indoor unit; furthermore, the fresh air fan is provided with a higher preset superheat degree or a preset supercooling degree to adjust an electronic expansion valve of the fresh air fan, so that the flow of the refrigerant entering the fresh air fan is controlled.
In any of the above technical solutions, preferably, the method further includes: when the ratio is greater than a second preset threshold and less than or equal to a third preset threshold, in the refrigeration mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the third preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a third preset supercooling degree; the third preset threshold is larger than the second preset threshold, the third preset superheat degree is equal to the sum of the first preset superheat degree and a second preset superheat degree difference, and the third preset subcooling degree is equal to the sum of the first preset subcooling degree and a second preset subcooling degree difference; the second preset superheat difference is larger than the first preset superheat difference, and the second preset subcooling difference is larger than the first preset subcooling difference.
In the technical scheme, when the air conditioner operates in a refrigeration mode, if the ratio is greater than a second preset threshold value and less than or equal to a third preset threshold value, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of the electronic expansion valve of a fresh air fan is adjusted according to the first preset supercooling degree plus a second preset supercooling degree difference value; when the air conditioner operates in a heating mode, if the ratio is greater than a second preset threshold and less than or equal to a third preset threshold, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of a fresh air fan is adjusted according to the first preset supercooling degree and a second preset supercooling degree difference, wherein the third preset threshold is greater than the second preset threshold, the second preset superheat degree difference is greater than a first preset superheat degree difference, and the second preset supercooling degree difference is greater than the first preset supercooling degree difference. When the ratio is larger than a second preset threshold value, the load occupation ratio of the fresh air machine in the multi-split system is too large, corresponding limitation needs to be carried out on the load occupation ratio, and the opening or closing of the electronic expansion valve of the indoor machine is determined by calculating the superheat degree or the supercooling degree of the outlet of the indoor machine; furthermore, the fresh air fan is provided with a higher preset superheat degree or a preset supercooling degree to adjust an electronic expansion valve of the fresh air fan, so that the flow of the refrigerant entering the fresh air fan is controlled.
In any of the above technical solutions, preferably, the method further includes: when the ratio is greater than a third preset threshold value, in the refrigeration mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset superheat degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the fourth preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the fourth preset supercooling degree; the fourth preset superheat degree is equal to the first preset superheat degree plus a third preset superheat degree difference value, and the fourth preset subcooling degree is equal to the first preset subcooling degree plus a third preset subcooling degree difference value; the third preset superheat difference value is larger than the second preset superheat difference value, and the third preset subcooling difference value is larger than the second preset subcooling difference value.
In the technical scheme, when the air conditioner operates in a refrigeration mode, if the ratio is greater than a third preset threshold value, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of a fresh air fan is adjusted according to the first preset superheat degree and a third preset superheat degree difference value; when the air conditioner operates in a heating mode, if the ratio is larger than a third preset threshold value, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to the first preset supercooling degree, the opening degree of an electronic expansion valve of a fresh air fan is adjusted according to the first preset supercooling degree and a third preset supercooling degree difference value, the third preset superheat degree difference value is larger than a second preset superheat degree difference value, and the third preset supercooling degree difference value is larger than a second preset supercooling degree difference value. When the ratio is larger than a third preset threshold value, the load occupation ratio of the fresh air machine in the multi-split system is too large, corresponding limitation needs to be carried out on the load occupation ratio, and the opening or closing of the electronic expansion valve of the indoor machine is determined by calculating the superheat degree or the supercooling degree of the outlet of the indoor machine; furthermore, the fresh air fan is provided with a higher preset superheat degree or a preset supercooling degree to adjust an electronic expansion valve of the fresh air fan, so that the flow of the refrigerant entering the fresh air fan is controlled.
In any of the above technical solutions, preferably, the method further includes: when the ratio is smaller than or equal to a first preset threshold value, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree in the refrigeration mode; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree; when the ratio is equal to 1 or 0, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree in the refrigeration mode; and under the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree.
In the technical scheme, when the air conditioner operates in a refrigeration mode, if the ratio is less than or equal to a first preset threshold value or the ratio is equal to 1 or 0, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree; when the air conditioner runs in a heating mode, if the ratio is smaller than or equal to a first preset threshold value or the ratio is equal to 1 or 0, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree.
In any of the above technical solutions, preferably, the total load value is equal to the sum of the fresh air load value and the load value of the indoor unit.
In the technical scheme, the fresh air load value and the load value of the indoor unit are equal to the total load value.
In conclusion, the opening degree of the electronic expansion valve is determined by calculating the load ratio of the fresh air machine load in the whole air conditioning system, and the whole system can be ensured to adapt to various different fresh air machine load ratios by the difference of the preset superheat degrees of the fresh air machine under different loads. According to different models or control accuracy, the new fan overheating/cooling interval can be divided into different dividing methods and different dividing intervals, so that the effect of providing fresh air with proper temperature for the indoor environment can be achieved by controlling the new fan and the electronic expansion valve of the common indoor unit, and the situation that the effect of other common indoor units is not good due to the fact that excessive refrigerants enter the new fan is avoided.
According to a second aspect of the embodiments of the present invention, the present invention provides a control system of an air conditioner, the air conditioner includes an indoor unit and a fresh air machine, the control system includes: the acquiring unit is used for acquiring a fresh air load value of the fresh air fan and a total load value of the air conditioner; the calculating unit is used for calculating the ratio of the fresh air load value to the total load value; and the control unit is used for controlling the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air fan according to the preset range of the ratio and the current operation mode of the air conditioner.
According to the control system of the air conditioner, the ratio of the fresh air load value to the total load value is calculated, the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air fan is controlled according to the preset range corresponding to the ratio and the current operation mode of the air conditioner, so that the electronic expansion valves of the indoor unit and the fresh air fan are respectively controlled on the basis of the actual operation condition of the fresh air fan, the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air fan is more reasonable, the operation effect of the whole air conditioning system is improved, the effect of providing fresh air with proper temperature for the indoor environment can be achieved, and meanwhile the poor temperature adjusting effect of the indoor unit caused by the fact that excessive refrigerants enter the fresh air fan can be avoided.
In the above technical solution, preferably, the method further includes: the acquisition unit is also used for acquiring the outlet temperature of a heat exchanger of the air conditioner; the calculation unit is also used for calculating the current superheat degree or the current supercooling degree of the heat exchanger according to the outlet temperature and the corresponding saturation temperature of the heat exchanger; the control unit is also used for adjusting the opening degree of the electronic expansion valve until the current superheat degree or the current supercooling degree reaches the preset superheat degree or the preset supercooling degree.
According to the technical scheme, the saturation temperature corresponding to the heat exchanger is obtained through the outlet temperature of the heat exchanger, the supercooling degree of the outlet of the heat exchanger or the superheat degree of the outlet of the heat exchanger is calculated, the opening degree of the electronic expansion valve is gradually adjusted, the supercooling degree of the outlet of the heat exchanger approaches to the preset supercooling degree, the supercooling degree of the outlet of the heat exchanger is finally enabled to be equal to the preset supercooling degree, or the superheat degree of the outlet of the heat exchanger approaches to the preset superheat degree, and the superheat degree of the outlet of the heat exchanger is finally enabled to be equal.
In any of the above technical solutions, preferably, the control unit is specifically configured to: when the ratio is greater than a first preset threshold value and less than or equal to a second preset threshold value, under the refrigeration mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a second preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a second preset supercooling degree; when the ratio is greater than a second preset threshold and less than or equal to a third preset threshold, in the refrigeration mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the third preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a third preset supercooling degree; when the ratio is greater than a third preset threshold value, in the refrigeration mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset superheat degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the fourth preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the fourth preset supercooling degree; the second preset threshold is greater than the first preset threshold, and the third preset threshold is greater than the second preset threshold; the second preset superheat degree is equal to the first preset superheat degree plus a first preset superheat degree difference, the third preset superheat degree is equal to the first preset superheat degree plus a second preset superheat degree difference, and the fourth preset superheat degree is equal to the first preset superheat degree plus a third preset superheat degree difference; the second preset supercooling degree is equal to the first preset supercooling degree plus a first preset supercooling degree difference value, the third preset supercooling degree is equal to the first preset supercooling degree plus a second preset supercooling degree difference value, and the fourth preset supercooling degree is equal to the first preset supercooling degree plus a third preset supercooling degree difference value; the second preset superheat difference value is larger than the first preset superheat difference value, and the third preset superheat difference value is larger than the second preset superheat difference value; the second preset supercooling degree difference value is larger than the first preset supercooling degree difference value, and the third preset supercooling degree difference value is larger than the second preset supercooling degree difference value.
In the technical scheme, when the air conditioner operates in a refrigeration mode, if the ratio is greater than a first preset threshold and less than or equal to a second preset threshold, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset superheat degree, and the opening degree of the electronic expansion valve of a fresh air fan is adjusted according to the first preset superheat degree and a first preset superheat degree difference; if the ratio is greater than a second preset threshold value and less than or equal to a third preset threshold value, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to the first preset supercooling degree plus a second preset supercooling degree difference value; if the ratio is larger than a third preset threshold value, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to the first preset superheat degree and a third preset superheat degree difference value; when the air conditioner operates in a heating mode, if the ratio is greater than a first preset threshold value and less than or equal to a second preset threshold value, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of a fresh air fan according to the first preset supercooling degree and a first preset supercooling degree difference value; if the ratio is greater than a second preset threshold value and less than or equal to a third preset threshold value, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to the first preset supercooling degree plus a second preset supercooling degree difference value; if the ratio is larger than a third preset threshold value, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to the first preset supercooling degree plus a third preset supercooling degree difference value; the first preset threshold is smaller than the second preset threshold, and the third preset threshold is larger than the second preset threshold; the second preset superheat difference value is larger than the first preset superheat difference value, and the third preset superheat difference value is larger than the second preset superheat difference value; the second preset supercooling degree difference value is larger than the first preset supercooling degree difference value, and the third preset supercooling degree difference value is larger than the second preset supercooling degree difference value.
In any of the above technical solutions, preferably, the control unit is further specifically configured to: when the ratio is smaller than or equal to a first preset threshold value, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree in the refrigeration mode; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree; when the ratio is equal to 1 or 0, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree in the refrigeration mode; and under the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree.
In the technical scheme, when the air conditioner operates in a refrigeration mode, if the ratio is less than or equal to a first preset threshold value or the ratio is equal to 1 or 0, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree; when the air conditioner runs in a heating mode, if the ratio is smaller than or equal to a first preset threshold value or the ratio is equal to 1 or 0, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree.
In any of the above technical solutions, preferably, the total load value is equal to the sum of the fresh air load value and the load value of the indoor unit.
In the technical scheme, the fresh air load value and the load value of the indoor unit are equal to the total load value.
In conclusion, the opening degree of the electronic expansion valve is determined by calculating the load ratio of the fresh air machine load in the whole air conditioning system, and the whole system can be ensured to adapt to various different fresh air machine load ratios by the difference of the preset superheat degrees of the fresh air machine under different loads. According to different models or control accuracy, the new fan overheating/cooling interval can be divided into different dividing methods and different dividing intervals, so that the effect of providing fresh air with proper temperature for the indoor environment can be achieved by controlling the new fan and the electronic expansion valve of the common indoor unit, and the situation that the effect of other common indoor units is not good due to the fact that excessive refrigerants enter the new fan is avoided.
According to a third aspect of the embodiment of the invention, the invention provides an air conditioner, which comprises the control system of the air conditioner according to any one of the technical schemes.
The air conditioner provided by the invention has all the advantages of the control system of the air conditioner according to any one of the above technical solutions because the air conditioner comprises the control system of the air conditioner according to any one of the above technical solutions, and the advantages are not mentioned here.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention;
fig. 4 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention;
fig. 5 is a schematic block diagram illustrating a control system of an air conditioner according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Fig. 1 is a flowchart illustrating a method for controlling an air conditioner according to an embodiment of the present invention.
As shown in fig. 1, a control method of an air conditioner according to an embodiment of the present invention includes the following steps:
102, acquiring a fresh air load value of a fresh air fan and a total load value of an air conditioner;
104, calculating the ratio of the fresh air load value to the total load value;
and 106, controlling the opening degree of an electronic expansion valve of the indoor unit and/or the fresh air machine according to the preset range of the ratio and the current operation mode of the air conditioner.
According to the control method of the air conditioner, the ratio of the fresh air load value to the total load value is calculated, the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air fan is controlled according to the preset range corresponding to the ratio and the current operation mode of the air conditioner, so that the electronic expansion valves of the indoor unit and the fresh air fan are respectively controlled on the basis of the actual operation condition of the fresh air fan, the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air fan is more reasonable, the operation effect of the whole air conditioning system is improved, the effect of providing fresh air with proper temperature for the indoor environment can be achieved, and meanwhile the poor temperature adjusting effect of the indoor unit caused by the fact that too much refrigerant enters the fresh air fan can be avoided.
Fig. 2 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention.
As shown in fig. 2, a control method of an air conditioner according to another embodiment of the present invention includes the following specific steps:
step 202, acquiring a fresh air load value of a fresh air fan and a total load value of an air conditioner;
step 204, calculating the ratio of the fresh air load value to the total load value;
step 206, acquiring the outlet temperature of a heat exchanger of the air conditioner;
208, calculating the current superheat degree or the current supercooling degree of the heat exchanger according to the outlet temperature and the corresponding saturation temperature of the heat exchanger;
step 210, controlling the opening degree of an electronic expansion valve of the indoor unit and/or the fresh air machine according to the preset range of the ratio and the current operation mode of the air conditioner;
and step 212, until the current superheat degree or the current supercooling degree reaches a preset superheat degree or a preset supercooling degree.
The invention provides a control method of an air conditioner, which obtains the saturation temperature corresponding to a heat exchanger through calculating the ratio of a fresh air load value to a total load value and the outlet temperature of the heat exchanger, then calculates the supercooling degree of the outlet of the heat exchanger or the superheat degree of the outlet of the heat exchanger, controls the opening degree of an electronic expansion valve of an indoor unit and/or a fresh air blower according to the preset range corresponding to the ratio and the current operation mode of the air conditioner, gradually adjusts the opening degree of the electronic expansion valve, enables the supercooling degree of the outlet of the heat exchanger to approach the preset supercooling degree, finally enables the supercooling degree of the outlet of the heat exchanger to be equal to the preset supercooling degree, or enables the superheat degree of the outlet of the heat exchanger to approach the preset superheat degree, and finally enables the superheat degree of the outlet of the heat exchanger to be equal to the preset superheat degree, thereby respectively controlling the electronic expansion valves of the indoor unit and the fresh air blower on, the operation effect of the whole air conditioning system is improved, the effect of providing fresh air with proper temperature for the indoor environment can be achieved, and poor temperature adjusting effect of the indoor unit caused by the fact that excessive refrigerants enter the fresh air machine can be avoided.
Fig. 3 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention.
As shown in fig. 3, a control method of an air conditioner according to another embodiment of the present invention includes the following specific steps:
step 302, acquiring a fresh air load value of a fresh air machine and a total load value of an air conditioner;
step 304, calculating the ratio of the fresh air load value to the total load value;
step 306, acquiring the outlet temperature of a heat exchanger of the air conditioner;
308, calculating the current superheat degree or the current supercooling degree of the heat exchanger according to the outlet temperature and the corresponding saturation temperature of the heat exchanger;
step 310, the air conditioner operates in a cooling mode;
step 312, the ratio is less than or equal to the first preset threshold;
step 314, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree;
step 316, the ratio is greater than a first preset threshold and less than or equal to a second preset threshold;
step 318, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the second preset superheat degree;
step 320, the ratio is greater than a second preset threshold and less than or equal to a third preset threshold;
322, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the third preset superheat degree;
step 324, the ratio is greater than the third preset threshold;
step 326, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the fourth preset superheat degree;
328, the ratio is equal to 1 or 0;
step 330, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree;
step 332, the air conditioner operates in a heating mode;
step 334, the ratio is equal to 1 or 0;
336, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree;
338, the ratio is larger than a third preset threshold;
step 340, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the fourth preset supercooling degree;
step 342, the ratio is greater than a second preset threshold and less than or equal to a third preset threshold;
344, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the third preset supercooling degree;
346, the ratio is greater than a first preset threshold and less than or equal to a second preset threshold;
step 348, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the second preset supercooling degree;
step 350, the ratio is smaller than or equal to the first preset threshold;
step 352, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree;
and 354, until the current superheat degree or the current supercooling degree reaches a preset superheat degree or a preset supercooling degree.
The control method of the air conditioner provided by the invention comprises the steps of calculating the ratio NFA/N of a fresh air load value NFA to a total load value N, obtaining the saturation temperature corresponding to a heat exchanger through the outlet temperature of the heat exchanger, then calculating the supercooling degree of the outlet of the heat exchanger or the superheat degree of the outlet of the heat exchanger, and determining the interval of the ratio when the air conditioner operates in a refrigeration mode, wherein the interval comprises the following steps: less than a first preset threshold y1, from a first preset threshold y1 to a second preset threshold y2, from a second preset threshold y2 to a third preset threshold y3, greater than a third preset threshold y3, 0 and 1.
If NFA/N is less than or equal to y1, the load ratio of the new fan in the multi-split air conditioner system is within an allowable range, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree a, namely adjusting the opening degree of the electronic expansion valve until the superheat degree of the outlet of the heat exchanger is equal to the first preset superheat degree a;
NFA/N & gty 1 shows that the load of the fresh air fan in the multi-split air-conditioning system is too large, and the fresh air fan needs to be correspondingly limited, if y1 is larger than NFA/N and is not larger than y2, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset superheat degree a until the superheat degree of an outlet of the heat exchanger is equal to a first preset superheat degree a, the opening degree of the electronic expansion valve of the fresh air fan is adjusted according to a second preset superheat degree a + k1 until the superheat degree of the outlet of the heat exchanger is equal to a second preset superheat degree a + k1, wherein the second preset superheat degree a + k1 is equal to the first preset superheat degree a plus a first preset superheat degree difference k 1;
if y2 is larger than NFA/N and smaller than or equal to y3, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset superheat degree a until the superheat degree of an outlet of the heat exchanger is equal to the first preset superheat degree a, adjusting the opening degree of the electronic expansion valve of a fresh air fan according to a third preset superheat degree a + k2 until the superheat degree of the outlet of the heat exchanger is equal to a third preset superheat degree a + k2, wherein the third preset superheat degree a + k2 is equal to the first preset superheat degree a plus a second preset superheat degree difference k 2;
if y3 is less than NFA/N, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset superheat degree a until the superheat degree of an outlet of a heat exchanger is equal to the first preset superheat degree a, adjusting the opening degree of the electronic expansion valve of a fresh air fan according to a fourth preset superheat degree a + k3 until the superheat degree of the outlet of the heat exchanger is equal to the fourth preset superheat degree a + k3, wherein the fourth preset superheat degree a + k3 is equal to the first preset superheat degree a plus a third preset superheat degree difference k 3;
if NFA/N is 0 or NFA/N is 1, it is described that all the indoor units operated in the air conditioner system are indoor units or all the indoor units are fresh air machines, and at this time, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree a until the superheat degree of an outlet of the heat exchanger is equal to the first preset superheat degree a.
And when the air conditioner operates in the heating mode, determining an interval in which the ratio is located, wherein the interval comprises: less than a first preset threshold y1, from a first preset threshold y1 to a second preset threshold y2, from a second preset threshold y2 to a third preset threshold y3, greater than a third preset threshold y3, 0 and 1.
If NFA/N is less than or equal to y1, the load ratio of the fresh air fan in the multi-split air conditioner system is within an allowable range, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree b, namely the opening degree of the electronic expansion valve is adjusted until the supercooling degree of the outlet of the heat exchanger is equal to the first preset supercooling degree b;
if y1 is larger than NFA/N and is not larger than y2, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset supercooling degree b until the supercooling degree of the outlet of the heat exchanger is equal to the first preset supercooling degree b, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to a second preset supercooling degree b + j1 until the supercooling degree of the outlet of the heat exchanger is equal to a second preset supercooling degree b + j1, wherein the second preset supercooling degree b + j1 is equal to the first preset supercooling degree b plus a first preset supercooling degree difference value j 1;
if y2 is larger than NFA/N and is not larger than y3, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset supercooling degree b until the supercooling degree of the outlet of the heat exchanger is equal to the first preset supercooling degree b, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to a third preset supercooling degree b + j2 until the supercooling degree of the outlet of the heat exchanger is equal to a third preset supercooling degree b + j2, wherein the third preset supercooling degree b + j2 is equal to the first preset supercooling degree b plus a second preset supercooling degree difference value j 2;
if y3 is less than NFA/N, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset supercooling degree b until the supercooling degree of the outlet of the heat exchanger is equal to the first preset supercooling degree b, adjusting the opening degree of the electronic expansion valve of the fresh air fan according to a fourth preset supercooling degree b + j3 until the supercooling degree of the outlet of the heat exchanger is equal to a fourth preset supercooling degree b + j3, wherein the fourth preset supercooling degree b + j3 is equal to the first preset supercooling degree b plus a third preset supercooling degree difference j 3;
and if NFA/N is 0 or 1, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset supercooling degree b until the supercooling degree of the outlet of the heat exchanger is equal to the first preset supercooling degree b.
Wherein y1 is more than y2 and less than y3, k1 is more than k2 and less than k3, and j1 is more than j2 and less than j 3.
The control method of the air conditioner can control the electronic expansion valve of the fresh air machine and the electronic expansion valve of the indoor machine, so that the effect of providing fresh air with proper temperature for the indoor environment can be achieved, and the condition that the temperature adjusting effect of other indoor machines is poor due to the fact that excessive refrigerants enter the fresh air machine is avoided.
In conclusion, the opening degree of the electronic expansion valve is determined by calculating the load ratio of the fresh air machine load in the whole air conditioning system, and the whole system can be ensured to adapt to various different fresh air machine load ratios by the difference of the preset superheat degrees of the fresh air machine under different loads. According to different models or control accuracy, the new fan overheating/cooling interval can be divided into different dividing methods and different dividing intervals, so that the effect of providing fresh air with proper temperature for the indoor environment can be achieved by controlling the new fan and the electronic expansion valve of the common indoor unit, and the situation that the effect of other common indoor units is not good due to the fact that excessive refrigerants enter the new fan is avoided.
Fig. 4 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the first aspect of the present invention.
As shown in fig. 4, a control method of an air conditioner according to another embodiment of the first aspect of the present invention includes the following specific steps:
step 402, acquiring a fresh air load value NFA of a fresh air machine and a total load value N of an air conditioner;
step 404, calculating the ratio NFA/N of the fresh air load value and the total load value;
step 406, acquiring the outlet temperature of a heat exchanger of the air conditioner;
step 408, calculating the current superheat degree or the current supercooling degree of the heat exchanger according to the outlet temperature and the corresponding saturation temperature of the heat exchanger;
step 410, determining whether NFA/N is 1 or 0; when the judgment result is yes, executing step 412, and when the judgment result is no, executing step 414;
step 412, in the cooling mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree;
step 414, judging whether y0 is equal to or less than NFA/N; if the determination result is yes, go to step 416, and if the determination result is no, go to step 418;
step 416, in the refrigeration mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree;
step 418, judging whether y1 is satisfied or not, wherein y0 is more than NFA/N and is not more than y 1; when the determination result is yes, go to step 420, and when the determination result is no, go to step 424;
step 420, in the cooling mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to a second preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a second preset supercooling degree;
step 422, judging whether y2 is satisfied when y1 is more than NFA/N and less than or equal to y 2; when the judgment result is yes, step 424 is executed, and when the judgment result is no, step 426 is executed;
step 424, in the cooling mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the third preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a third preset supercooling degree;
step 426, y2 is less than or equal to NFA/N;
428, in the cooling mode, adjusting the opening degree of the electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to the fourth preset superheat degree; in the heating mode, the opening degree of the electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree, and the opening degree of the electronic expansion valve of the fresh air fan is adjusted according to the fourth preset supercooling degree
And 430, until the current superheat degree or the current supercooling degree reaches a preset superheat degree or a preset supercooling degree.
The control method of the air conditioner provided by the invention comprises the steps of detecting the load demand of an opened indoor unit after an air conditioner system starts to operate, obtaining the corresponding saturation temperature of a heat exchanger through the outlet temperature of the heat exchanger by calculating the ratio NFA/N of a fresh air load value NFA to a total load value N, then calculating the supercooling degree of the outlet of the heat exchanger or the superheat degree of the outlet of the heat exchanger, then judging whether NFA/N is equal to 1 or 0, and when NFA/N is equal to 1 or 0, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree when the air conditioner is in a refrigeration mode; when the air conditioner is in a heating mode, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset supercooling degree; when NFA/N is not equal to 1 or 0, further judging whether NFA/N is smaller than or equal to a first preset threshold value y1, and when NFA/N is smaller than or equal to a first preset threshold value y1, when the air conditioner is in a refrigeration mode, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset superheat degree; when the air conditioner is in a heating mode, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset supercooling degree; when NFA/N is not less than or equal to a first preset threshold value y1, further judging whether NFA/N is greater than a first preset threshold value y1 and less than or equal to a second preset threshold value y2, when NFA/N is greater than the first preset threshold value y1 and less than or equal to the second preset threshold value y2, when the air conditioner is in a refrigeration mode, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset superheat degree, and adjusting the opening degree of the electronic expansion valve of a fresh air fan according to a second preset superheat degree; when the air conditioner is in a heating mode, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of a fresh air fan is adjusted according to a second preset supercooling degree; when the NFA/N is not more than a first preset threshold value y1 and is not more than a second preset threshold value y2, further judging whether the NFA/N is more than a second preset threshold value y2 and is not more than a third preset threshold value y3, and when the NFA/N is more than the second preset threshold value y2 and is not more than a third preset threshold value y3, when the air conditioner is in a refrigeration mode, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of a fresh air fan according to a third preset superheat degree; when the air conditioner is in a heating mode, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of a fresh air fan is adjusted according to a third preset supercooling degree; when the NFA/N is not more than a second preset threshold value y2 and is not more than a third preset threshold value y3, further judging whether the NFA/N is more than a third preset threshold value y3, and when the NFA/N is more than a third preset threshold value y3, when the air conditioner is in a refrigeration mode, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of a fresh air fan according to a fourth preset superheat degree; when the air conditioner is in a heating mode, the opening degree of an electronic expansion valve of an indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of a fresh air fan is adjusted according to a fourth preset supercooling degree; finally, the opening degree of the electronic expansion valve is adjusted, so that the current superheat degree or the current supercooling degree reaches the preset superheat degree or the preset supercooling degree, the control method of the air conditioner can control the electronic expansion valve of the fresh air machine and the electronic expansion valve of the indoor machine, the effect of providing fresh air with proper temperature for the indoor environment can be achieved, and the condition that the temperature adjusting effect of other indoor machines is poor due to the fact that excessive refrigerants enter the fresh air machine is avoided.
In a specific embodiment, the control method of the electronic expansion valve of the indoor unit and the fresh air fan of the multi-split air conditioner provided by the invention determines the electronic expansion valve of the indoor unit and the fresh air fan by calculating the load ratio of the fresh air fan load in the whole air conditioning system; the opening or closing of the electronic expansion valves of the indoor unit and the fresh air fan is determined by calculating the superheat degree or the supercooling degree of the outlet of the heat exchanger; when the load ratio of the load of the fresh air machine in the whole air conditioning system is 0 or 1, and the air conditioning system is in refrigeration operation, all the internal machine electronic expansion valves are adjusted according to a first preset superheat degree a; when the air conditioning system is in heating operation, all the internal machine electronic expansion valves are adjusted according to a first preset supercooling degree b; the electronic expansion valve of the fresh air fan is adjusted by setting a higher target superheat degree or supercooling degree of the fresh air fan, so that the flow of a refrigerant entering the fresh air fan is controlled; the whole system can be ensured to adapt to various different fresh air fan load ratios by the difference of the target superheat degrees of the fresh air fans under different loads; according to different models or control accuracy, the division of the fresh air fan superheat degree or supercooling degree interval can have different division methods and division intervals, the division grade of the superheat degree or supercooling degree interval can be set at will, and any number of intervals can be set.
As shown in fig. 5, according to a second aspect of the present invention, the present invention provides a control system 500 of an air conditioner, the air conditioner includes an indoor unit and a fresh air machine, the control system includes: an obtaining unit 502, configured to obtain a fresh air load value of the fresh air machine and a total load value of the air conditioner; a calculating unit 504, configured to calculate a ratio of the fresh air load value to the total load value; and the control unit 506 is configured to control the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air blower according to the preset range where the ratio is located and the current operation mode of the air conditioner.
According to the control system 500 of the air conditioner, the ratio of the fresh air load value to the total load value is calculated, the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air machine is controlled according to the preset range corresponding to the ratio and the current operation mode of the air conditioner, so that the electronic expansion valves of the indoor unit and the fresh air machine are respectively controlled on the basis of the actual operation condition of the fresh air machine, the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air machine is enabled to be more reasonable, the operation effect of the whole air conditioning system is improved, the effect of providing fresh air with proper temperature for the indoor environment can be achieved, and meanwhile the poor temperature adjusting effect of the indoor unit caused by the fact that too much refrigerant enters the fresh air machine can be avoided.
Further preferably, the method further comprises the following steps: the obtaining unit 502 is further configured to obtain an outlet temperature of a heat exchanger of the air conditioner; the calculating unit 504 is further configured to calculate a current superheat degree or a current supercooling degree of the heat exchanger according to the outlet temperature and the saturation temperature corresponding to the heat exchanger; the control unit 506 is further configured to adjust the opening degree of the electronic expansion valve until the current superheat degree or the current subcooling degree reaches a preset superheat degree or a preset subcooling degree.
In the embodiment, the saturation temperature corresponding to the heat exchanger is obtained through the outlet temperature of the heat exchanger, the supercooling degree of the outlet of the heat exchanger or the superheat degree of the outlet of the heat exchanger is calculated, the opening degree of the electronic expansion valve is gradually adjusted, the supercooling degree of the outlet of the heat exchanger approaches the preset supercooling degree, the supercooling degree of the outlet of the heat exchanger is finally enabled to be equal to the preset supercooling degree, the superheat degree of the outlet of the heat exchanger approaches the preset superheat degree, and the superheat degree of the outlet of the heat exchanger is finally enabled to be equal to the preset.
Further preferably, the control unit 506 is specifically configured to: when the ratio is greater than a first preset threshold value and less than or equal to a second preset threshold value, under the refrigeration mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a second preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a second preset supercooling degree; when the ratio is greater than a second preset threshold and less than or equal to a third preset threshold, in the refrigeration mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the third preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a third preset supercooling degree; when the ratio is greater than a third preset threshold value, in the refrigeration mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset superheat degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the fourth preset superheat degree; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the fourth preset supercooling degree; the second preset threshold is greater than the first preset threshold, and the third preset threshold is greater than the second preset threshold; the second preset superheat degree is equal to the first preset superheat degree plus a first preset superheat degree difference, the third preset superheat degree is equal to the first preset superheat degree plus a second preset superheat degree difference, and the fourth preset superheat degree is equal to the first preset superheat degree plus a third preset superheat degree difference; the second preset supercooling degree is equal to the first preset supercooling degree plus a first preset supercooling degree difference value, the third preset supercooling degree is equal to the first preset supercooling degree plus a second preset supercooling degree difference value, and the fourth preset supercooling degree is equal to the first preset supercooling degree plus a third preset supercooling degree difference value; the second preset superheat difference value is larger than the first preset superheat difference value, and the third preset superheat difference value is larger than the second preset superheat difference value; the second preset supercooling degree difference value is larger than the first preset supercooling degree difference value, and the third preset supercooling degree difference value is larger than the second preset supercooling degree difference value.
In this embodiment, when the air conditioner operates in the cooling mode, if the ratio is greater than a first preset threshold and less than or equal to a second preset threshold, the opening degree of the electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree, and the opening degree of the electronic expansion valve of the fresh air fan is adjusted according to the first preset superheat degree plus a first preset superheat degree difference; if the ratio is greater than a second preset threshold value and less than or equal to a third preset threshold value, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to the first preset supercooling degree plus a second preset supercooling degree difference value; if the ratio is larger than a third preset threshold value, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to the first preset superheat degree and a third preset superheat degree difference value; when the air conditioner operates in a heating mode, if the ratio is greater than a first preset threshold value and less than or equal to a second preset threshold value, adjusting the opening degree of an electronic expansion valve of an indoor unit according to a first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of a fresh air fan according to the first preset supercooling degree and a first preset supercooling degree difference value; if the ratio is greater than a second preset threshold value and less than or equal to a third preset threshold value, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to the first preset supercooling degree plus a second preset supercooling degree difference value; if the ratio is larger than a third preset threshold value, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree, and adjusting the opening degree of the electronic expansion valve of the fresh air fan according to the first preset supercooling degree plus a third preset supercooling degree difference value; the first preset threshold is smaller than the second preset threshold, and the third preset threshold is larger than the second preset threshold; the second preset superheat difference value is larger than the first preset superheat difference value, and the third preset superheat difference value is larger than the second preset superheat difference value; the second preset supercooling degree difference value is larger than the first preset supercooling degree difference value, and the third preset supercooling degree difference value is larger than the second preset supercooling degree difference value.
Further preferably, the control unit 506 is specifically further configured to: when the ratio is smaller than or equal to a first preset threshold value, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree in the refrigeration mode; in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree; when the ratio is equal to 1 or 0, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree in the refrigeration mode; and under the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree.
In this embodiment, when the air conditioner operates in the cooling mode, if the ratio is less than or equal to a first preset threshold value or the ratio is equal to 1 or 0, the opening degree of the electronic expansion valve of the indoor unit is adjusted according to a first preset superheat degree; when the air conditioner runs in a heating mode, if the ratio is smaller than or equal to a first preset threshold value or the ratio is equal to 1 or 0, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree.
In one embodiment of the present invention, preferably, the total load value is equal to the sum of the fresh air load value and the load value of the indoor unit.
In this embodiment, the fresh air load value plus the load value of the indoor unit is equal to the total load value.
According to a third aspect of the present invention, there is provided an air conditioner including the control system of the air conditioner as provided in any one of the above embodiments.
The air conditioner provided by the invention has all the advantages of the control system of the air conditioner provided by any one of the embodiments, and therefore, the control system of the air conditioner provided by any one of the embodiments is not mentioned herein.
In the present invention, the terms "mounting," "connecting," "fixing," and the like are used in a broad sense, for example, "connecting" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. A control method of an air conditioner, the air conditioner comprises an indoor unit and a fresh air machine, and is characterized in that the control method comprises the following steps:
acquiring a fresh air load value of the fresh air machine and a total load value of the air conditioner;
calculating the ratio of the fresh air load value to the total load value;
controlling the opening degree of an electronic expansion valve of the indoor unit and/or the fresh air fan according to the preset range of the ratio and the current operation mode of the air conditioner;
the step of controlling the opening degree of the electronic expansion valve of the indoor unit and/or the fresh air machine according to the preset range of the ratio and the current operation mode of the air conditioner specifically comprises the following steps:
when the ratio is greater than a first preset threshold value and less than or equal to a second preset threshold value, under the refrigeration mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to a second preset superheat degree;
in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a second preset supercooling degree;
the second preset threshold is larger than the first preset threshold, the second preset superheat degree is equal to the first preset superheat degree plus a first preset superheat degree difference, and the second preset subcooling degree is equal to the first preset subcooling degree plus a first preset subcooling degree difference.
2. The control method of an air conditioner according to claim 1, further comprising:
acquiring the outlet temperature of a heat exchanger of the air conditioner;
calculating the current superheat degree or the current supercooling degree of the heat exchanger according to the outlet temperature and the saturation temperature corresponding to the heat exchanger;
and adjusting the opening degree of the electronic expansion valve until the current superheat degree or the current supercooling degree reaches a preset superheat degree or a preset supercooling degree.
3. The control method of an air conditioner according to claim 2, further comprising:
when the ratio is larger than the second preset threshold and smaller than or equal to a third preset threshold, in a refrigeration mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the third preset superheat degree;
in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the third preset supercooling degree;
the third preset threshold is larger than the second preset threshold, the third preset superheat degree is equal to the first preset superheat degree plus a second preset superheat degree difference, and the third preset subcooling degree is equal to the first preset subcooling degree plus the second preset subcooling degree difference;
the second preset superheat difference value is larger than the first preset superheat difference value, and the second preset subcooling difference value is larger than the first preset subcooling difference value.
4. The control method of an air conditioner according to claim 3, further comprising:
when the ratio is larger than the third preset threshold value, in a refrigeration mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset superheat degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a fourth preset superheat degree;
in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the fourth preset supercooling degree;
the fourth preset superheat degree is equal to the first preset superheat degree plus a third preset superheat degree difference value, and the fourth preset subcooling degree is equal to the first preset subcooling degree plus a third preset subcooling degree difference value;
the third preset superheat degree difference value is larger than the second preset superheat degree difference value, and the third preset subcooling degree difference value is larger than the second preset subcooling degree difference value.
5. The control method of an air conditioner according to claim 2, further comprising:
when the ratio is smaller than or equal to the first preset threshold value, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset superheat degree in the refrigeration mode;
in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree;
when the ratio is equal to 1 or 0, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree in a refrigeration mode;
and under the heating mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree.
6. The control method of an air conditioner according to any one of claims 1 to 5, wherein said total load value is equal to a sum of said fresh air load value and a load value of said indoor unit.
7. The utility model provides a control system of air conditioner, the air conditioner includes indoor set and new fan, its characterized in that, control system includes:
the acquiring unit is used for acquiring a fresh air load value of the fresh air fan and a total load value of the air conditioner;
the calculating unit is used for calculating the ratio of the fresh air load value to the total load value;
the control unit is used for controlling the opening degree of an electronic expansion valve of the indoor unit and/or the fresh air fan according to the preset range of the ratio and the current operation mode of the air conditioner;
the control unit is specifically configured to:
when the ratio is greater than a first preset threshold value and less than or equal to a second preset threshold value, under the refrigeration mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to a first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to a second preset superheat degree;
in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to a first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a second preset supercooling degree;
the second preset threshold is larger than the first preset threshold, the second preset superheat degree is equal to the first preset superheat degree plus a first preset superheat degree difference, and the second preset subcooling degree is equal to the first preset subcooling degree plus a first preset subcooling degree difference.
8. The control system of an air conditioner according to claim 7, further comprising:
the acquisition unit is also used for acquiring the outlet temperature of a heat exchanger of the air conditioner;
the calculation unit is also used for calculating the current superheat degree or the current supercooling degree of the heat exchanger according to the outlet temperature and the saturation temperature corresponding to the heat exchanger;
the control unit is also used for adjusting the opening degree of the electronic expansion valve until the current superheat degree or the current supercooling degree reaches a preset superheat degree or a preset supercooling degree.
9. The control system of an air conditioner according to claim 8, wherein the control unit is further configured to:
when the ratio is larger than the second preset threshold and smaller than or equal to a third preset threshold, in a refrigeration mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree, and adjusting the opening degree of an electronic expansion valve of the fresh air fan according to the third preset superheat degree;
in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the third preset supercooling degree;
when the ratio is larger than the third preset threshold value, in a refrigeration mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset superheat degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to a fourth preset superheat degree;
in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree, and the opening degree of an electronic expansion valve of the fresh air fan is adjusted according to the fourth preset supercooling degree;
wherein the third preset threshold is greater than the second preset threshold;
the third preset superheat degree is equal to the first preset superheat degree plus a second preset superheat degree difference, and the fourth preset superheat degree is equal to the first preset superheat degree plus a third preset superheat degree difference;
the third preset supercooling degree is equal to the first preset supercooling degree plus a second preset supercooling degree difference value, and the fourth preset supercooling degree is equal to the first preset supercooling degree plus a third preset supercooling degree difference value;
the second preset superheat degree difference value is larger than the first preset superheat degree difference value, and the third preset superheat degree difference value is larger than the second preset superheat degree difference value;
the second preset supercooling degree difference value is larger than the first preset supercooling degree difference value, and the third preset supercooling degree difference value is larger than the second preset supercooling degree difference value.
10. The control system of an air conditioner according to claim 8, wherein the control unit is further configured to:
when the ratio is smaller than or equal to the first preset threshold value, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset superheat degree in the refrigeration mode;
in the heating mode, the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the first preset supercooling degree;
when the ratio is equal to 1 or 0, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset superheat degree in a refrigeration mode;
and under the heating mode, adjusting the opening degree of an electronic expansion valve of the indoor unit according to the first preset supercooling degree.
11. The control system of an air conditioner according to any one of claims 7 to 10, wherein said total load value is equal to a sum of said fresh air load value and a load value of said indoor unit.
12. An air conditioner characterized by comprising the control system of the air conditioner as set forth in any one of claims 7 to 11.
CN201810814714.4A 2018-07-23 2018-07-23 Control method and control system of air conditioner and air conditioner Active CN108954712B (en)

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