CN108518808B - Control method and device of air conditioner and air conditioner with control device - Google Patents

Control method and device of air conditioner and air conditioner with control device Download PDF

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Publication number
CN108518808B
CN108518808B CN201810603192.3A CN201810603192A CN108518808B CN 108518808 B CN108518808 B CN 108518808B CN 201810603192 A CN201810603192 A CN 201810603192A CN 108518808 B CN108518808 B CN 108518808B
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state
preset
state signal
refrigerant
exceeds
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CN108518808A (en
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郑春元
谭志军
杨坤
王命仁
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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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Priority to PCT/CN2019/089863 priority patent/WO2019237960A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

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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)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a control method and a control device of an air conditioner and the air conditioner with the same, wherein the air conditioner runs in a low-temperature mixed mode, and the method comprises the following steps: determining that an outdoor heat exchanger of an air conditioner operates in an evaporator state; acquiring state parameters for identifying the state of a refrigerant, and acquiring a state signal of the refrigerant of the refrigeration indoor unit according to the state parameters; wherein, the state parameters at least comprise the superheat degree of the refrigerating machine; and adjusting the opening degree of the electronic expansion valve of the outdoor unit according to the state signal of the refrigeration indoor unit. The method can adjust the opening of the electronic expansion valve of the outer machine according to the state signal of the refrigeration inner machine when the outdoor heat exchanger of the air conditioner operates in the evaporator state, thereby effectively improving the reliability of control, widening the reliable operation range of the system and effectively solving the problem of reasonable distribution of refrigerants between the refrigeration inner machine and the outer machine under the low-temperature working condition.

Description

Control method and device of air conditioner and air conditioner with control device
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of an air conditioner and the air conditioner with the device.
Background
At present, an air conditioner sometimes operates under the working conditions of high indoor temperature and low outdoor temperature (such as-25 ℃ to 0 ℃ or lower), for example, places such as a communication base station, a high-grade restaurant, a bakery, a hotel, a dance hall and the like, a large amount of heat sources are arranged in the room to ensure that the indoor temperature is high, and the places have special requirements on the quality of indoor air, cannot directly introduce the low-temperature outdoor air into the room to reduce the indoor temperature, and need the air conditioner to refrigerate in the room. The conventional air conditioner can only refrigerate at the outdoor temperature of 7-43 ℃ and cannot refrigerate at the outdoor temperature of-25-0 ℃ or lower.
Also as an evaporator, there is a great difference in temperature between the outdoor side and the indoor side, and the outdoor temperature determines that the low pressure will be in a low state. Under the condition of ensuring comfortable refrigeration air supply temperature, because the low pressure is lower, the quantity of the refrigerant required by the refrigeration indoor unit is less than that required by normal temperature refrigeration, namely, the superheat degree of the refrigerant after heat exchange of the refrigeration indoor unit is large, and the outdoor unit is basically not overheated. Therefore, the resistance of the outdoor unit is smaller in the unit refrigerant flow rate state, and the refrigerant flows to the outdoor unit more easily.
When the electronic expansion valve of the outdoor unit is opened greatly, the refrigerant flowing to the refrigerating indoor unit is less, and the situation of bias flow between the refrigerating indoor units is easy to occur. When the electronic expansion valve of the outdoor unit is opened less, more refrigerants flow to the refrigeration indoor unit and are in the condition of low pressure, so that the condition of frosting of the indoor unit is easy to occur. The superheat degree required by the refrigerating indoor unit is large, and the current control method for the constant superheat degree is difficult to adapt to the application scene. Under the condition of pressure control, when the outdoor unit is used as an evaporator in a low-temperature mixed mode, the target low pressure of the outdoor unit is used as a control target, and the output of the refrigeration indoor unit cannot be controlled, which needs to be solved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a control method for an air conditioner, which can adjust the opening of an electronic expansion valve of an external unit according to a status signal of the refrigeration internal unit when an outdoor heat exchanger of the air conditioner operates in an evaporator state, thereby effectively improving the reliability of control, widening the reliable operation range of the system, and effectively solving the problem of reasonable distribution of refrigerants between the refrigeration internal unit and the external unit under a low-temperature working condition.
A second object of the present invention is to provide a control device for an air conditioner.
A third object of the present invention is to provide an air conditioner.
A fourth object of the invention is to propose an electronic device.
A fifth object of the invention is to propose a non-transitory computer-readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for controlling an air conditioner, where the air conditioner operates in a low-temperature hybrid mode, and the method includes: determining that an outdoor heat exchanger of the air conditioner runs in an evaporator state; acquiring state parameters for identifying the state of a refrigerant, and acquiring a state signal of the refrigerant of the refrigeration indoor unit according to the state parameters; wherein the state parameters at least comprise the superheat degree of the refrigerating indoor unit; and adjusting the opening of the electronic expansion valve of the outdoor unit according to the state signal of the refrigeration indoor unit.
The control method of the air conditioner provided by the embodiment of the invention can determine that the outdoor heat exchanger of the air conditioner runs in the evaporator state, acquire the state parameters for identifying the state of the refrigerant, acquire the state signals of the refrigerant of the refrigeration indoor unit according to the state parameters, and adjust the opening of the electronic expansion valve of the outdoor unit according to the state signals of the refrigeration indoor unit, thereby effectively improving the reliability of control, widening the reliable running range of the system and effectively solving the problem of reasonable distribution of the refrigerant between the refrigeration indoor unit and the outdoor unit under the low-temperature working condition.
In an embodiment of the present invention, the adjusting the opening of the outdoor unit electronic expansion valve according to the state signal of the refrigeration indoor unit includes: acquiring a first specific gravity of the refrigerating inner machines which send out first state signals of refrigerant shortage in all the refrigerating inner machines; judging whether a first duration of the first ratio exceeding a preset first ratio threshold exceeds a preset first duration or not; judging whether the second duration of a second state signal of refrigerant surplus sent by all the refrigerating internal machines exceeds the preset second duration or not; and if the first duration time of which the first ratio exceeds a preset first ratio threshold exceeds the first duration time and the second duration time exceeds the second duration time, controlling to reduce the opening degree of the electronic expansion valve of the outdoor unit.
In an embodiment of the present invention, the method for controlling an air conditioner further includes: when the first duration time that the first specific gravity exceeds a preset first specific gravity threshold value exceeds the first duration time and the second duration time exceeds the second duration time and is not simultaneously met, acquiring a second specific gravity of the refrigerating indoor units which send out a third state signal that the refrigerant is excessive in all the refrigerating indoor units; judging whether a third duration of the second specific gravity exceeding a preset second specific gravity threshold exceeds a preset third duration or not; judging whether the fourth duration of the fourth state signal of refrigerant shortage sent by all the refrigeration internal machines exceeds the preset fourth duration; judging whether the exhaust superheat degree of the air conditioner is larger than a preset superheat degree threshold value or not; and if a third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, the fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold, controlling to increase the opening degree of the outdoor unit electronic expansion valve.
In an embodiment of the present invention, the method for controlling an air conditioner further includes: and when a third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, a fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold and is not simultaneously met, controlling and maintaining the current opening degree of the outer machine electronic expansion valve.
In an embodiment of the present invention, the obtaining a state signal of a refrigerant of the refrigeration indoor unit according to the state parameter and the superheat degree includes: matching the state parameters with at least one preset state identification strategy respectively; and controlling the refrigerating inner machine to send out the state signal according to the state parameter and the matching result of each state identification strategy.
In an embodiment of the present invention, the method for controlling an air conditioner further includes: and when the state signal is the first state signal, determining a target state identification strategy for triggering the first state signal, and correcting the current target superheat degree according to the target state identification strategy.
In an embodiment of the present invention, the modifying the current target superheat degree according to the target state identification strategy includes: when the target state identification strategy is a preset first state identification strategy, controlling to correct the target superheat degree to a preset superheat degree until the first state signal is changed from the preset corresponding target state identification strategy to other preset state identification strategies; and when the target state identification strategy is a preset second state identification strategy, controlling to reduce the target superheat degree until the target state identification strategy is changed into other preset state identification strategies.
In an embodiment of the present invention, the method for controlling an air conditioner further includes: in the process of respectively matching state parameters with at least one preset state identification strategy, if the state parameters are simultaneously matched with a plurality of state identification strategies to trigger generation of the first state signal, acquiring the priority of each state identification strategy in the plurality of state identification strategies, and controlling sending of the first state signal triggered by the state identification strategy with high priority.
In an embodiment of the present invention, the method for controlling an air conditioner further includes: acquiring the inlet temperature of the refrigerant; judging whether an indoor unit anti-freezing control flow is entered or not according to the entering temperature and the state signal of the refrigeration indoor unit; if the entering temperature is less than or equal to a preset first temperature threshold value and the state signal is not the state signal with the surplus refrigerant, controlling to enter an anti-freezing process of the indoor unit; the refrigerant surplus state signal comprises the second state signal and the third state signal; continuously detecting the entry temperature, and controlling to exit the anti-freezing process of the internal machine if the entry temperature is greater than or equal to a preset second temperature threshold value or the state signal is a state signal with insufficient refrigerant; the refrigerant shortage state signal comprises the first state signal and the fourth state signal.
In order to achieve the above object, a second aspect of the present invention provides a control apparatus for an air conditioner, the air conditioner operating in a low-temperature hybrid mode, the apparatus including: the determining module is used for determining that an outdoor heat exchanger of the air conditioner runs in an evaporator state; the acquisition module is used for acquiring state parameters for identifying the state of a refrigerant and acquiring a state signal of the refrigerant of the refrigeration indoor unit according to the state parameters; wherein the state parameters at least comprise the superheat degree of the refrigerating indoor unit; and the adjusting module is used for adjusting the opening of the electronic expansion valve of the outdoor unit according to the state signal of the refrigeration indoor unit.
The control device of the air conditioner provided by the embodiment of the invention can determine that the outdoor heat exchanger of the air conditioner runs in the evaporator state through the determining module, acquire the state parameters for identifying the state of the refrigerant through the acquiring module, acquire the state signals of the refrigerant of the refrigerating inner machine according to the state parameters, and adjust the opening of the electronic expansion valve of the outer machine through the adjusting module according to the state signals of the refrigerating inner machine, thereby effectively improving the reliability of control, widening the reliable running range of the system and effectively solving the problem of reasonable distribution of the refrigerant between the refrigerating inner machine and the outer machine under the low-temperature working condition.
In an embodiment of the present invention, the adjusting module is specifically configured to: acquiring a first specific gravity of the refrigerating inner machines which send out first state signals of refrigerant shortage in all the refrigerating inner machines; judging whether a first duration of the first ratio exceeding a preset first ratio threshold exceeds a preset first duration or not; judging whether the second duration of a second state signal of refrigerant surplus sent by all the refrigerating internal machines exceeds the preset second duration or not; and if the first duration time of which the first ratio exceeds a preset first ratio threshold exceeds the first duration time and the second duration time exceeds the second duration time, controlling to reduce the opening degree of the electronic expansion valve of the outdoor unit.
In an embodiment of the present invention, the adjusting module is further configured to: when the first duration time that the first specific gravity exceeds a preset first specific gravity threshold value exceeds the first duration time and the second duration time exceeds the second duration time and is not simultaneously met, acquiring a second specific gravity of the refrigerating indoor units which send out a third state signal that the refrigerant is excessive in all the refrigerating indoor units; judging whether a third duration of the second specific gravity exceeding a preset second specific gravity threshold exceeds a preset third duration or not; judging whether the fourth duration of the fourth state signal of refrigerant shortage sent by all the refrigeration internal machines exceeds the preset fourth duration; judging whether the exhaust superheat degree of the air conditioner is larger than a preset superheat degree threshold value or not; and if a third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, the fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold, controlling to increase the opening degree of the outdoor unit electronic expansion valve.
In an embodiment of the present invention, the adjusting module is further configured to: and when a third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, a fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold and is not simultaneously met, controlling and maintaining the current opening degree of the outer machine electronic expansion valve.
In an embodiment of the present invention, the obtaining module is specifically configured to: matching the state parameters with at least one preset state identification strategy respectively; and controlling the refrigerating inner machine to send out the state signal according to the state parameter and the matching result of each state identification strategy.
In an embodiment of the present invention, the control device of an air conditioner further includes: a superheat degree adjusting module; the superheat degree adjusting module is used for: and when the state signal is the first state signal, determining a target state identification strategy for triggering the first state signal, and correcting the current target superheat degree according to the target state identification strategy.
In an embodiment of the invention, the superheat adjustment module is further configured to: when the target state identification strategy is a preset first state identification strategy, controlling to correct the target superheat degree to a preset superheat degree until the first state signal is changed from the preset corresponding target state identification strategy to other preset state identification strategies; and when the target state identification strategy is a preset second state identification strategy, controlling to reduce the target superheat degree until the target state identification strategy is changed into other preset state identification strategies.
In an embodiment of the present invention, the obtaining module is further configured to: in the process of respectively matching state parameters with at least one preset state identification strategy, if the state parameters are simultaneously matched with a plurality of state identification strategies to trigger generation of the first state signal, acquiring the priority of each state identification strategy in the plurality of state identification strategies, and controlling sending of the first state signal triggered by the state identification strategy with high priority.
In an embodiment of the present invention, the control device of an air conditioner further includes: an anti-freezing control module; the anti-freezing control module is used for: acquiring the inlet temperature of the refrigerant; judging whether an indoor unit anti-freezing control flow is entered or not according to the entering temperature and the state signal of the refrigeration indoor unit; if the entering temperature is less than or equal to a preset first temperature threshold value and the state signal is not the state signal with the surplus refrigerant, controlling to enter an anti-freezing process of the indoor unit; the refrigerant surplus state signal comprises the second state signal and the third state signal; continuously detecting the entry temperature, and controlling to exit the anti-freezing process of the internal machine if the entry temperature is greater than or equal to a preset second temperature threshold value or the state signal is a state signal with insufficient refrigerant; the refrigerant shortage state signal comprises the first state signal and the fourth state signal.
In order to achieve the above object, a third embodiment of the present invention provides an air conditioner, which includes the control device of the air conditioner.
According to the air conditioner provided by the embodiment of the invention, the outdoor heat exchanger of the air conditioner can be determined to be in the evaporator state operation by the determining module, the state parameter for identifying the refrigerant state is acquired by the acquiring module, the state signal of the refrigerant of the refrigerating inner machine is acquired according to the state parameter, the opening of the electronic expansion valve of the outer machine is adjusted by the adjusting module according to the state signal of the refrigerating inner machine, the control reliability is effectively improved, the reliable operation range of the system is widened, and the problem of reasonable refrigerant distribution between the refrigerating inner machine and the outer machine under the low-temperature working condition is effectively solved.
In order to achieve the above object, a fourth aspect of the present invention provides an electronic device, including a memory, a processor; the processor reads the executable program codes stored in the memory to run programs corresponding to the executable program codes, so as to realize the control method of the air conditioner.
The electronic equipment of the embodiment of the invention can effectively improve the reliability of control, effectively reduce the cost of the refrigeration indoor unit, effectively save resources and is simple and easy to realize when the program corresponding to the control method of the air conditioner stored on the electronic equipment is executed.
To achieve the above object, a fifth embodiment of the present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, where the computer program is executed by a processor to implement the control method of the air conditioner.
The non-transitory computer-readable storage medium of the embodiment of the invention, when the program corresponding to the control method of the air conditioner stored on the non-transitory computer-readable storage medium is executed, can effectively improve the reliability of control, effectively reduce the cost of the refrigeration indoor unit, effectively save resources, and is simple and easy to implement.
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 foregoing 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 of a control method of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating refrigerant determination according to an embodiment of the invention;
fig. 3 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of an air conditioner according to another embodiment of the present invention;
fig. 5 is a schematic diagram of a modified logic for a refrigeration indoor unit according to an embodiment of the present invention;
fig. 6 is a flowchart of a control method of an air conditioner according to still another embodiment of the present invention;
fig. 7 is a block diagram schematically illustrating a control apparatus of an air conditioner according to an embodiment of the present invention; and
fig. 8 is a block diagram illustrating a control apparatus of an air conditioner according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control method and apparatus of an air conditioner and an air conditioner having the same according to an embodiment of the present invention will be described below with reference to the accompanying drawings, and first, a control method of an air conditioner according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention.
The air conditioner provided by the embodiment of the invention needs to operate in the low-temperature mixed mode, and under the condition that the low-temperature mixed mode is low-temperature refrigeration, because the outdoor temperature is low, the indoor space also has heating requirements at the same time, so the low-temperature refrigeration is often accompanied with heating, namely the system is often in the operation state of heating and refrigerating at the same time under the condition.
As shown in fig. 1, the control method of the air conditioner includes the steps of:
and S1, determining that the outdoor heat exchanger of the air conditioner is in the evaporator state for operation.
In the low-temperature mixed mode, the outdoor heat exchanger of the air conditioner can switch between the condenser and the evaporator according to the load condition of indoor cooling and heating. When the outdoor temperature is low, the heating load is often larger than the cooling load, so that most of the outdoor heat exchangers are in an evaporator state. Therefore, before the opening degree of the outer machine electronic expansion valve is adjusted, the outdoor heat exchanger of the air conditioner can be determined to be in the evaporator state for operation.
S2, collecting state parameters for identifying the state of the refrigerant, and acquiring state signals of the refrigerant of the refrigeration indoor unit according to the state parameters; wherein, the state parameters at least comprise the superheat degree of the refrigerating machine.
Specifically, state parameters for identifying the state of the refrigerant can be collected, wherein the state parameters at least include the superheat degree of the refrigeration indoor unit, and further, the state parameters also include the indoor environment temperature, the set temperature, the temperature of the refrigerant at the outlet of the refrigeration indoor unit, the temperature of the refrigerant at the inlet of the refrigeration indoor unit, the opening degree of an electronic expansion valve of the refrigeration indoor unit, and the like.
In the embodiment of the invention, different state identification strategies can be preset, the acquired state parameters are matched with the different state identification strategies, one state identification strategy matched with the state parameters can be obtained, and further the state signals of the refrigerant of the refrigerating indoor unit can be determined. The state signal of the refrigerant may include a state signal of insufficient refrigerant, a state signal of excessive refrigerant, and a state signal of moderate refrigerant.
As a possible implementation mode, the temperature of the refrigerant at the outlet of the refrigerating machine and the temperature of the refrigerant at the inlet of the refrigerating machine can be detected, and the superheat degree of the refrigerating machine can be obtained according to the temperature of the refrigerant at the outlet of the refrigerating machine and the temperature of the refrigerant at the inlet of the refrigerating machine. The calculation formula of the superheat degree of the refrigerating indoor unit is as follows:
SH＝Tout-Tin，
SH is the currently detected superheat degree, Tout is the temperature of the refrigerant at the outlet of the refrigerating machine, and Tin is the temperature of the refrigerant at the inlet of the refrigerating machine.
And S3, adjusting the opening of the electronic expansion valve of the outdoor unit according to the state signal of the refrigeration indoor unit.
As shown in fig. 2, the refrigerant in the air conditioner may be insufficient, excessive, or moderate. The refrigerant can be divided into 5 areas according to the state of the refrigerant: area a, area b, area c, area d, and area e, wherein the refrigerant insufficient region includes: AreaC, AreaD, and AreaE; the refrigerant moderate area is as follows: AreaB; the refrigerant surplus area is as follows: and (4) area. In general, the opening degree of the electronic expansion valve of the outdoor unit may be decreased when the refrigerant is insufficient, and may be increased when the refrigerant is excessive.
Note that Tin represents the detected temperature after the refrigerant entering the refrigeration indoor unit is throttled; ten indoor ambient temperature; saturation temperature corresponding to low pressure of Te system; ttag is a Tin-Te value corresponding to a large refrigerant excess.
Specifically, when the system enters a low-temperature mixed mode and the outdoor heat exchanger operates in an evaporator state, whether the refrigerant quantity of the refrigeration indoor unit is in an insufficient state or an excessive state can be identified according to the state information of the refrigeration indoor unit, and then the opening degree of the external motor electronic expansion valve can be adjusted.
Therefore, according to the control method of the air conditioner provided by the embodiment of the invention, the outdoor heat exchanger of the air conditioner can be determined to be in the evaporator state operation, the state parameters for identifying the state of the refrigerant are collected, the state signal of the refrigerant of the refrigeration indoor unit is obtained according to the state parameters, and the opening degree of the electronic expansion valve of the outdoor unit is adjusted according to the state signal of the refrigeration indoor unit, namely the opening degree of the electronic expansion valve is dynamically adjusted according to the sufficiency of the refrigerant in the refrigeration indoor unit, so that the amount of the refrigerant in the refrigeration indoor unit is adaptive to the opening degree of the electronic expansion valve, the control reliability is effectively improved, the cost of the refrigeration indoor unit is effectively reduced, resources are saved.
In an embodiment of the present invention, as shown in fig. 3, the method for controlling an air conditioner, where the adjusting the opening of the electronic expansion valve of the outdoor unit according to the state signal of the indoor cooling unit includes the following steps:
s301, acquiring a first specific gravity of the refrigerating inner machines sending out the first state signals of refrigerant shortage in all the refrigerating inner machines.
Specifically, when the system enters a low-temperature mixed mode and the outdoor heat exchanger operates in an evaporator state, the opening degree of the electronic expansion valve of the outdoor unit can be adjusted by judging the refrigerant shortage state signal of the refrigeration indoor unit and the refrigerant excess state signal of the refrigeration indoor unit. Therefore, the first specific gravity of the refrigeration indoor units which send out the first state signal of refrigerant shortage (the refrigerant shortage signal is ON) in all the refrigeration indoor units can be obtained first, and for example, the first specific gravity can be X%.
S302, whether a first duration of which the first ratio exceeds a preset first ratio threshold exceeds a preset first duration is judged.
Specifically, when the first specific gravity X% of all the refrigeration internal machines of the refrigeration internal machines which send the first state signal of refrigerant shortage exceeds the preset first specific gravity threshold, it is determined again whether the first duration time that the first specific gravity exceeds the preset first specific gravity threshold exceeds the preset first time length, for example, the first preset time length is β minutes.
And S303, judging whether the second duration of the second state signal that all the refrigerating inner machines send out the refrigerant surplus exceeds the preset second duration.
Specifically, when all the refrigeration internal machines send out the second state signal of refrigerant excess (the refrigerant excess signal is OFF), whether the second duration of all the second state signals of refrigerant excess exceeds the preset second duration is judged. The preset second time period may be designed by a person skilled in the art according to actual situations, and is not specifically limited herein.
S304, if the first duration of the first ratio exceeding the preset first ratio threshold exceeds the first duration and the second duration exceeds the second duration, controlling to reduce the opening degree of the electronic expansion valve of the outdoor unit.
Specifically, when a first duration time that satisfies that a first ratio exceeds a preset first ratio threshold exceeds a preset first duration time and all second duration times that send out a second state signal with excessive refrigerants exceed a preset second duration time, the opening of the outer machine electronic expansion valve, for example, the outer machine electronic expansion valve switch ω Pls, can be controlled to be reduced, so that the problem of refrigerant bias flow of the refrigeration inner machine due to the fact that the refrigerant of the refrigeration inner machine is less in the refrigeration inner machine caused by too large opening of the outer machine electronic expansion valve under various working conditions can be effectively avoided.
In an embodiment of the present invention, as shown in fig. 4, the control method of the air conditioner further includes the following steps:
s401, when the first duration time that the first proportion exceeds the preset first proportion threshold value exceeds the first duration time and the second duration time exceeds the second duration time and is not simultaneously met, acquiring the second proportion of the refrigeration indoor units which send out the third state signals of the surplus refrigerants in all the refrigeration indoor units.
Specifically, if a first duration that the first specific gravity exceeds a preset first specific gravity threshold value and a second duration that all the second state signals that the refrigerant is excessive exceeds a preset second duration cannot be simultaneously satisfied, the second specific gravity of the refrigeration indoor units that emit the third state signals that the refrigerant is excessive (the refrigerant is excessive is ON) in all the refrigeration indoor units may be obtained, for example, the second specific gravity may be Y%.
S402, judging whether a third duration of the second specific gravity exceeding a preset second specific gravity threshold exceeds a preset third duration.
Secondly, when the second specific gravity Y% of all the refrigeration indoor units of the refrigeration indoor unit which sends the refrigerant surplus third status signal exceeds the preset second specific gravity threshold, it is determined again whether a third duration time for which the second specific gravity exceeds the preset second specific gravity threshold exceeds a preset third duration time, for example, the third preset duration time is β minutes.
If the third duration that the second specific gravity exceeds the preset second specific gravity threshold is judged to exceed the preset third duration, continuing to execute step 403; otherwise, step 406 is performed.
The preset third specific gravity threshold and the preset third time period may be designed by those skilled in the art according to actual situations, and are not specifically limited herein.
And S403, judging whether the fourth duration of the fourth state signal of refrigerant shortage sent by all the refrigeration inner machines exceeds the preset fourth duration.
Specifically, when all the refrigeration inner machines send out the fourth state signal of refrigerant shortage (the refrigerant shortage signal is OFF), whether the fourth duration of all the fourth state signals of refrigerant shortage exceeds the preset fourth duration is further judged.
If the fourth duration of the fourth state signals of refrigerant shortage sent by all the refrigeration indoor units exceeds the preset fourth duration, continuing to execute the step 404; otherwise, step 406 is performed.
The preset fourth time period may be designed by a person skilled in the art according to actual situations, and is not specifically limited herein.
S404, judging whether the exhaust superheat degree of the air conditioner is larger than a preset superheat degree threshold value.
Further, the exhaust superheat degree of the air conditioner needs to be acquired, and then the exhaust superheat degree is compared with a preset superheat degree threshold value. If the exhaust superheat degree of the air conditioner is judged to be larger than the preset superheat degree threshold value, continuing to execute the step 405; otherwise, step 406 is performed.
The preset superheat threshold may be θ ℃, which may be designed by a person skilled in the art according to practical situations and is not specifically limited herein.
And S405, controlling to increase the opening of the electronic expansion valve of the outer machine.
Specifically, when the third duration satisfying that the second specific gravity exceeds the preset second specific gravity threshold exceeds the preset third duration and all the fourth duration sending out the refrigerant-deficient fourth status signal exceeds the preset fourth duration, and the exhaust superheat degree of the air conditioner is greater than θ ℃, the opening degree of the outer machine electronic expansion valve, for example, the opening ω Pls of the outer machine electronic expansion valve, can be controlled to be increased, so that the problems that the refrigeration inner machine has too much refrigerant and the air supply temperature is too low due to too small outer machine electronic expansion valve in various working conditions can be effectively avoided.
And S406, controlling and maintaining the current opening degree of the electronic expansion valve of the outer machine.
Specifically, if a third duration that the second specific gravity exceeds the preset second specific gravity threshold value and a fourth duration that all the fourth state signals of refrigerant shortage exceed a preset fourth duration cannot be met simultaneously, and the exhaust superheat degree of the air conditioner is greater than theta ℃, the current opening degree of the outer unit electronic expansion valve is controlled to be maintained, namely the opening degree of the outer unit electronic expansion valve is kept unchanged.
In an embodiment of the present invention, acquiring a state signal of a refrigerant of a refrigeration indoor unit according to a state parameter includes: respectively matching the state parameters with at least one preset state identification strategy; and controlling the refrigeration inner machine to send out a state signal according to the state parameter and the matching result of each state identification strategy.
Specifically, (1) the opening degree of an internal Electronic expansion valve (EXV) of the refrigeration internal unit can be controlled; the detected degree of superheat and the target degree of superheat; and a first temperature difference between the return air temperature of the air conditioner and the set refrigeration temperature, namely when the following 3 formulas are met, the refrigeration inner machine can be controlled to send out a first state signal.
EXV opening ≧ lambda of refrigeration indoor unit1pls，
SH≧MaxSHS，
Ten-Ts≧2℃。
Specifically, the target degree of superheat SHS of the low-temperature mixed-mode refrigerant indoor unit can be determined by table 1.
TABLE 1
Figure BDA0001693771770000101
Or the first temperature difference between the return air temperature of the air conditioner and the set refrigerating temperature and the second temperature difference between the return air temperature of the air conditioner and the temperature of the refrigerant imported into the refrigerating indoor unit can be used for controlling the refrigerating indoor unit to send out a first state signal when the following 2 formulas are met.
Ten-Tin < χ ℃, and lasting for more than 3 minutes;
Ten-Ts≧2℃。
or the detected degree of superheat and the target degree of superheat; the second temperature difference between the return air temperature of the air conditioner and the temperature of the refrigerant at the inlet of the refrigerating indoor unit is used; and a third temperature difference between the temperature of the refrigerant at the inlet of the refrigerating inner machine and the saturation temperature corresponding to the low pressure of the system, namely when the following 3 formulas are simultaneously met, the refrigerating inner machine can be controlled to send out a first state signal.
Tin-Te is not less than Tag and lasts for more than 3 minutes;
SH≧MinSHS，
Ten-Ts≧2℃。
the temperature control method comprises the steps of detecting the temperature of a refrigerating machine, detecting the temperature of a refrigerant inlet of the refrigerating machine, detecting the temperature of a refrigerant outlet of the refrigerating machine, and detecting the temperature of the refrigerant inlet of the refrigerating machine.
(2) The opening degree of an electronic expansion valve of the indoor unit of the refrigeration indoor unit can be adjusted; the detected degree of superheat and the target degree of superheat; and the temperature of the refrigerant at the inlet of the refrigerating inner machine, namely when the following 2 formulas are met, the refrigerating inner machine can be controlled to send out a second state signal.
EXV opening ≧ lambda of refrigeration indoor unit2+τ2pls，
SH≧MinSHS+2，
Tin≧ξ+1℃。
(3) The opening degree of an electronic expansion valve of the indoor unit of the refrigeration indoor unit can be adjusted; the detected degree of superheat and the target degree of superheat; and the temperature of the refrigerant at the inlet of the refrigerating inner machine, namely when the following 2 formulas are met, the refrigerating inner machine can be controlled to send out a third state signal.
EXV opening degree of indoor unit of refrigerator<λ2pls，
SH<MinSHS，
Tin<ξ℃。
(4) The opening degree of an electronic expansion valve of the indoor unit of the refrigeration indoor unit can be adjusted; the detected degree of superheat and the target degree of superheat; and a first temperature difference between the return air temperature of the air conditioner and the set refrigeration temperature, namely when any one of the following 3 formulas is met, the refrigeration inner machine can be controlled to send out a fourth state signal.
EXV opening degree of indoor unit of refrigerator<λ1-τ1pls，
SH<MaxSHS-1，
Ten-Ts<1.5℃，
Or the air-conditioning air return temperature and the set refrigeration temperature can be used for first temperature difference, and the air-conditioning air return temperature and the refrigeration indoor unit inlet refrigerant temperature are used for second temperature difference, namely when any one of the following 2 formulas is met, the refrigeration indoor unit can be controlled to send out a fourth state signal.
Ten-Tin≧χ+3℃，
Ten-Ts<1.5℃。
Or the second temperature difference between the return air temperature of the air conditioner and the temperature of the refrigerant at the inlet of the refrigerating indoor unit can be used; and a third temperature difference between the temperature of the refrigerant at the inlet of the refrigerating inner machine and the saturation temperature corresponding to the low pressure of the system, namely when any one of the following 2 formulas is met, the refrigerating inner machine can be controlled to send out a fourth state signal.
Tin-Te<Tag-2，
Ten-Ts<1.5℃，
Wherein, Ten is the return air temperature, Tin is the temperature of the refrigerant at the inlet of the refrigerating inner machine, Ts is the set refrigerating temperature of the inner machine, and Te is the saturation temperature corresponding to the low pressure of the system.
Therefore, the state parameters are respectively matched with at least one preset state identification strategy, so that the refrigeration indoor unit can be controlled to send out state signals according to the matching results of the state parameters and each state identification strategy, the variable target superheat degree control method can adapt to the condition that the temperature difference between the indoor space and the outdoor space is larger, the reliability is further improved, and the operation range can be further widened.
In one embodiment of the present invention, further comprising: when the state signal is the first state signal, when the target state triggering the first state signal is a preset first state identification strategy, the target superheat degree is controlled to be corrected to be the preset superheat degree until the first state signal is changed from the preset corresponding target state identification strategy to other preset state identification strategies.
Specifically, when the target state identification strategy is a preset first state identification strategy, the following 2 formulas are required to be simultaneously satisfied, so as to control the refrigeration internal machine to send out a first state signal.
Ten-Tin < χ ℃, and lasting for more than 3 minutes;
Ten-Ts≧2℃。
in order to control the target superheat degree to be corrected to the preset superheat degree, as shown in fig. 5, the target superheat degree may be forcibly adjusted to: and the SHS is 1 until the refrigerant shortage signal is changed from the preset corresponding target state identification strategy to other preset state identification strategies.
In one embodiment of the present invention, further comprising: when the state signal is a first state signal, when the target state triggering the first state signal is a preset first state identification strategy, and when the target state identification strategy is a preset second state identification strategy, the target superheat degree is controlled to be reduced until the target state identification strategy is changed into other preset state identification strategies.
Specifically, when the target state identification strategy is a preset second state identification strategy, the following 3 formulas are required to be simultaneously satisfied, so as to control the refrigeration internal machine to send out a first state signal.
Tin-Te is not less than Tag and lasts for more than 3 minutes;
SH≧MinSHS，
Ten-Ts≧2℃。
in order to control the target superheat degree to be corrected to the preset superheat degree, as shown in fig. 5, the target superheat degree may be forcibly adjusted to: and (4) until the target state identification strategy is changed into other preset state identification strategies when the SHS is equal to the current SH-3.
In an embodiment of the present invention, the method for controlling an air conditioner further includes: in the process of respectively matching the state parameters with at least one preset state identification strategy, if the state parameters are simultaneously matched with a plurality of state identification strategy triggers to generate a first state signal, acquiring the priority of each state identification strategy in the plurality of state identification strategies, and controlling to send the first state signal triggered by the state identification strategy with high priority.
Specifically, if a first state identification strategy, a second state identification strategy and a third state identification strategy are simultaneously matched and simultaneously triggered to generate a first state signal in the process of matching the state parameters and the state identification strategies, the priorities of the first state identification strategy, the second state identification strategy and the third state identification strategy need to be judged, and if the first state identification strategy is higher than the second state identification strategy and the third state identification strategy, the first state signal triggered by the first state identification strategy is controlled; if the second state identification strategy is higher than the first state identification strategy and the third state identification strategy, controlling a first state signal triggered by the second state identification strategy; and if the third state identification strategy is higher than the first state identification strategy and the second state identification strategy, controlling the first state signal triggered by the third state identification strategy.
In an embodiment of the present invention, as shown in fig. 6, the method for controlling an air conditioner further includes the following steps:
s601, acquiring the entering temperature of the refrigerant.
And S602, judging whether to enter an anti-freezing control flow of the indoor unit according to the entering temperature and the state signal of the refrigerating indoor unit.
Specifically, the anti-freezing control of the refrigeration indoor unit in the related art usually judges whether to perform the anti-freezing control only by judging the time when the temperature of the refrigerant inlet is lower than the frosting point, and under the condition of low-temperature refrigeration, because the low pressure is lower, the inlet state is usually lower than the frosting point, the refrigerant flow is less, and the refrigerant is easy to overheat, most of the heat exchangers are in the state higher than the frosting point, frost is not easy to accumulate on the part lower than the frosting point, and the anti-freezing control is not needed. In the case of pressure control, when the external unit is used as an evaporator in the low-temperature mixed mode, the output of the refrigeration internal unit cannot be controlled by using the target low pressure of the external unit as a control target.
Therefore, in order to better control the flow of entering or exiting the anti-freezing process of the internal machine, the entering speed of the refrigerant can be firstly obtained, and whether the flow enters the anti-freezing control process of the internal machine or not can be judged according to the entering speed and the state signal of the refrigerating internal machine.
S603, if the entering temperature is less than or equal to a preset first temperature threshold value and the state signal is a state signal with excessive non-refrigerant, controlling the entering of an anti-freezing process of the internal machine; the refrigerant excess state signal comprises a second state signal and a third state signal.
Specifically, the entering temperature is less than or equal to the preset first temperature threshold value for a certain period of time. Wherein the first preset threshold value can be-1 ℃ and the duration time is mu minutes.
Specifically, when the temperature of the refrigerant entering the inner machine is less than-1 ℃, and the duration is mu minutes, and the state signal is not the state signal of the surplus refrigerant, the flow entering the inner machine for preventing freezing can be controlled.
S604, continuously detecting the entering temperature, and controlling to exit the anti-freezing process of the internal machine if the entering temperature is greater than or equal to a preset second temperature threshold value or the state signal is a state signal with insufficient refrigerant; the refrigerant shortage state signal comprises a first state signal and a fourth state signal.
Specifically, the entering temperature is greater than or equal to the preset second temperature threshold value for a certain period of time. Wherein the second preset threshold may be K ℃.
Specifically, when the temperature > of the refrigerant entering the internal machine is K ℃, and the duration is μminutes, or the status signal is a status signal of insufficient refrigerant, the flow of the internal machine for preventing freezing can be controlled to exit, so that the application range of the freezing prevention control is wider.
According to the control method of the air conditioner, provided by the embodiment of the invention, the outdoor heat exchanger of the air conditioner can be determined to run in the evaporator state, the state parameter for identifying the state of the refrigerant is collected, the state signal of the refrigerant of the refrigerating inner machine is obtained according to the state parameter, and the opening of the electronic expansion valve of the outer machine is adjusted according to the state signal of the refrigerating inner machine, so that the problem that the target low-pressure control of the outer machine is invalid under the condition of pressure control is effectively solved, the reliability of control is effectively improved, the cost of the refrigerating inner machine is effectively reduced, resources are saved, and the control method is simple and easy.
Next, a control device of an air conditioner proposed according to an embodiment of the present invention is described with reference to the accompanying drawings.
Fig. 7 is a block diagram schematically illustrating a control apparatus of an air conditioner according to an embodiment of the present invention.
The air conditioner operates in the low temperature hybrid mode, and as shown in fig. 7, the control apparatus of the air conditioner includes: a determination module 100, an acquisition module 200, and an adjustment module 300.
The determining module 100 is configured to determine that an outdoor heat exchanger of an air conditioner is in an evaporator state. The acquisition module 200 is configured to acquire a state parameter for identifying a state of a refrigerant, and acquire a state signal of the refrigerant of the refrigeration indoor unit according to the state parameter; wherein, the state parameters at least comprise the superheat degree of the refrigerating machine. The adjusting module 300 is configured to adjust an opening of the electronic expansion valve of the outdoor unit according to the state signal of the refrigeration indoor unit.
In an embodiment of the present invention, the adjusting module 300 is specifically configured to: acquiring a first specific gravity of the refrigerating inner machines which send out first state signals of refrigerant shortage in all the refrigerating inner machines; judging whether a first duration of which the first ratio exceeds a preset first ratio threshold exceeds a preset first duration or not; judging whether the second duration of a second state signal of refrigerant surplus sent by all the refrigerating internal machines exceeds the preset second duration or not; and if the first duration of the first ratio exceeding a preset first ratio threshold value exceeds a first duration and the second duration exceeds a second duration, controlling to reduce the opening degree of the electronic expansion valve of the outdoor unit.
In one embodiment of the present invention, the adjustment module 300 is further configured to: when the first duration time of which the first ratio exceeds a preset first ratio threshold value exceeds the first duration time and the second duration time exceeds the second duration time and is not simultaneously met, acquiring a second proportion of the refrigerating indoor units which send out a third state signal of refrigerant surplus in all the refrigerating indoor units; judging whether a third duration of the second specific gravity exceeding a preset second specific gravity threshold exceeds a preset third duration or not; judging whether the fourth duration of the fourth state signal of refrigerant shortage sent by all the refrigeration internal machines exceeds the preset fourth duration; judging whether the exhaust superheat degree of the air conditioner is larger than a preset superheat degree threshold value or not; and if the third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, the fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold, controlling to increase the opening degree of the electronic expansion valve of the outdoor unit.
In one embodiment of the present invention, the adjustment module 300 is further configured to: and when the third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, the fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold and is not simultaneously met, controlling and maintaining the current opening degree of the electronic expansion valve of the outdoor unit.
In an embodiment of the present invention, the obtaining module 100 is specifically configured to: respectively matching the state parameters with at least one preset state identification strategy; and controlling the refrigeration inner machine to send out a state signal according to the state parameter and the matching result of each state identification strategy.
Further, in addition to the control device of the air conditioner shown in fig. 7, as shown in fig. 8, the control device of the air conditioner further includes: a superheat adjustment module 400 and an anti-freeze control module 500. Wherein the superheat adjustment module 400 is configured to: and when the state signal is the first state signal, determining a target state identification strategy for triggering the first state signal, and correcting the current target superheat degree according to the target state identification strategy.
In one embodiment of the invention, the superheat adjustment module. The superheat adjustment module 400 is specifically configured to: when the target state identification strategy is a preset first state identification strategy, the target superheat degree is controlled to be corrected to be a preset superheat degree until the first state signal is changed from the preset corresponding target state identification strategy to other preset state identification strategies; and when the target state identification strategy is a preset second state identification strategy, controlling to reduce the target superheat degree until the target state identification strategy is changed into other preset state identification strategies.
In an embodiment of the present invention, the obtaining module 100 is further configured to: in the process of respectively matching the state parameters with at least one preset state identification strategy, if the state parameters are simultaneously matched with a plurality of state identification strategy triggers to generate a first state signal, acquiring the priority of each state identification strategy in the plurality of state identification strategies, and controlling to send the first state signal triggered by the state identification strategy with high priority.
Further, the anti-freezing control module 500 is configured to: acquiring the inlet temperature of a refrigerant; judging whether the indoor unit enters an anti-freezing control flow or not according to the entering temperature and the state signal of the refrigeration indoor unit; if the entering temperature is less than or equal to a preset first temperature threshold value and the state signal is a state signal with excessive non-refrigerant, controlling the entering of an anti-freezing process of the internal machine; the refrigerant surplus state signals comprise a second state signal and a third state signal; continuously detecting the entering temperature, and controlling to exit the anti-freezing process of the internal machine if the entering temperature is greater than or equal to a preset second temperature threshold value or the state signal is a state signal with insufficient refrigerant; the refrigerant shortage state signal comprises a first state signal and a fourth state signal.
It should be noted that the foregoing explanation on the embodiment of the control method of the air conditioner is also applicable to the control device of the air conditioner in this embodiment, and details are not repeated here.
According to the control device of the air conditioner, the outdoor heat exchanger of the air conditioner can be determined to be in the evaporator state operation through the determining module, the state parameters for identifying the state of the refrigerant are collected through the obtaining module, so that the state signal of the refrigerant of the refrigerating inner machine is obtained according to the state parameters, the opening degree of the electronic expansion valve of the outer machine is adjusted through the adjusting module according to the state signal of the refrigerating inner machine, the control reliability is effectively improved, the cost of the refrigerating inner machine is effectively reduced, resources are saved, and the control device is simple and easy to implement.
The embodiment of the invention also provides an air conditioner which comprises the control device of the air conditioner.
According to the air conditioner provided by the embodiment of the invention, the outdoor heat exchanger of the air conditioner can be determined to be in the evaporator state operation through the determining module, the state parameter for identifying the refrigerant state is acquired through the acquiring module, so that the state signal of the refrigerant of the refrigerating inner machine is acquired according to the state parameter, and the opening degree of the electronic expansion valve of the outer machine is adjusted through the adjusting module according to the state signal of the refrigerating inner machine, so that the control reliability is effectively improved, the cost of the refrigerating inner machine is effectively reduced, the resource is saved, and the air conditioner is simple and easy to implement.
The embodiment of the invention also provides electronic equipment, which comprises a memory and a processor; the processor reads the executable program codes stored in the memory to run programs corresponding to the executable program codes, so as to realize the control method of the air conditioner.
According to the electronic equipment provided by the embodiment of the invention, when the program corresponding to the control method of the air conditioner is executed, the control reliability can be effectively improved, the cost of the refrigeration indoor unit is effectively reduced, the resources are effectively saved, and the electronic equipment is simple and easy to implement.
An embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, and the program, when executed by a processor, implements the control method of the air conditioner described above.
According to the non-transitory computer-readable storage medium provided by the embodiment of the invention, when the program corresponding to the control method of the air conditioner is executed, the control reliability can be effectively improved, the cost of the refrigeration indoor unit can be effectively reduced, the resources can be effectively saved, and the method is simple and easy to implement.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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 present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (19)

1. A control method of an air conditioner, wherein the air conditioner is operated in a low-temperature hybrid mode, the method comprising the steps of:
determining that an outdoor heat exchanger of the air conditioner runs in an evaporator state;
acquiring state parameters for identifying the state of a refrigerant, and acquiring a state signal of the refrigerant of the refrigeration indoor unit according to the state parameters; wherein the state parameters at least comprise the superheat degree of the refrigerating indoor unit;
adjusting the opening degree of an electronic expansion valve of the outdoor unit according to the state signal of the refrigeration indoor unit;
wherein, according to the state signal of refrigeration indoor set, adjust outer quick-witted electronic expansion valve's aperture, include: acquiring a first specific gravity of the refrigerating inner machines which send out first state signals of refrigerant shortage in all the refrigerating inner machines; judging whether a first duration of the first ratio exceeding a preset first ratio threshold exceeds a preset first duration or not; judging whether the second duration of a second state signal of refrigerant surplus sent by all the refrigerating internal machines exceeds the preset second duration or not; and if the first duration time of which the first ratio exceeds a preset first ratio threshold exceeds the first duration time and the second duration time exceeds the second duration time, controlling to reduce the opening degree of the electronic expansion valve of the outdoor unit.
2. The method of claim 1, further comprising:
when the first duration time that the first specific gravity exceeds a preset first specific gravity threshold value exceeds the first duration time and the second duration time exceeds the second duration time and is not simultaneously met, acquiring a second specific gravity of the refrigerating indoor units which send out a third state signal that the refrigerant is excessive in all the refrigerating indoor units;
judging whether a third duration of the second specific gravity exceeding a preset second specific gravity threshold exceeds a preset third duration or not;
judging whether the fourth duration of the fourth state signal of refrigerant shortage sent by all the refrigeration internal machines exceeds the preset fourth duration;
judging whether the exhaust superheat degree of the air conditioner is larger than a preset superheat degree threshold value or not;
and if a third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, the fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold, controlling to increase the opening degree of the outdoor unit electronic expansion valve.
3. The method of claim 2, further comprising:
and when a third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, a fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold and is not simultaneously met, controlling and maintaining the current opening degree of the outer machine electronic expansion valve.
4. The method as claimed in claim 1, wherein the obtaining a state signal of a refrigerant of the refrigeration indoor unit according to the state parameter and the superheat degree comprises:
matching the state parameters with at least one preset state identification strategy respectively;
and controlling the refrigerating inner machine to send out the state signal according to the state parameter and the matching result of each state identification strategy.
5. The method of claim 4, further comprising:
and when the state signal is the first state signal, determining a target state identification strategy for triggering the first state signal, and correcting the current target superheat degree according to the target state identification strategy.
6. The method of claim 5, wherein said modifying a current target superheat based on said target state identification strategy comprises:
when the target state identification strategy is a preset first state identification strategy, controlling to correct the target superheat degree to a preset superheat degree until the first state signal is changed from the preset corresponding target state identification strategy to other preset state identification strategies;
and when the target state identification strategy is a preset second state identification strategy, controlling to reduce the target superheat degree until the target state identification strategy is changed into other preset state identification strategies.
7. The method of claim 6, further comprising:
in the process of respectively matching state parameters with at least one preset state identification strategy, if the state parameters are simultaneously matched with a plurality of state identification strategies to trigger generation of the first state signal, acquiring the priority of each state identification strategy in the plurality of state identification strategies, and controlling sending of the first state signal triggered by the state identification strategy with high priority.
8. The method of any one of claims 1-7, further comprising:
acquiring the inlet temperature of the refrigerant;
judging whether an indoor unit anti-freezing control flow is entered or not according to the entering temperature and the state signal of the refrigeration indoor unit;
if the entering temperature is less than or equal to a preset first temperature threshold value and the state signal is not the state signal with the surplus refrigerant, controlling to enter an anti-freezing process of the indoor unit; the refrigerant surplus state signal comprises the second state signal and a third state signal;
continuously detecting the entry temperature, and controlling to exit the anti-freezing process of the internal machine if the entry temperature is greater than or equal to a preset second temperature threshold value or the state signal is a state signal with insufficient refrigerant; the refrigerant shortage state signal comprises the first state signal and a fourth state signal.
9. A control apparatus of an air conditioner, wherein the air conditioner is operated in a low temperature hybrid mode, the apparatus comprising:
the determining module is used for determining that an outdoor heat exchanger of the air conditioner runs in an evaporator state;
the acquisition module is used for acquiring state parameters for identifying the state of the refrigerant and acquiring a state signal of the refrigerant of the refrigeration indoor unit according to the state parameters; wherein the state parameters at least comprise the superheat degree of the refrigerating indoor unit;
the adjusting module is used for adjusting the opening of the electronic expansion valve of the outdoor unit according to the state signal of the refrigeration indoor unit;
wherein, the adjusting module is specifically configured to: acquiring a first specific gravity of the refrigerating inner machines which send out first state signals of refrigerant shortage in all the refrigerating inner machines; judging whether a first duration of the first ratio exceeding a preset first ratio threshold exceeds a preset first duration or not; judging whether the second duration of a second state signal of refrigerant surplus sent by all the refrigerating internal machines exceeds the preset second duration or not; and if the first duration time of which the first ratio exceeds a preset first ratio threshold exceeds the first duration time and the second duration time exceeds the second duration time, controlling to reduce the opening degree of the electronic expansion valve of the outdoor unit.
10. The apparatus of claim 9, wherein the adjustment module is further configured to:
when the first duration time that the first specific gravity exceeds a preset first specific gravity threshold value exceeds the first duration time and the second duration time exceeds the second duration time and is not simultaneously met, acquiring a second specific gravity of the refrigerating indoor units which send out a third state signal that the refrigerant is excessive in all the refrigerating indoor units;
judging whether a third duration of the second specific gravity exceeding a preset second specific gravity threshold exceeds a preset third duration or not;
judging whether the fourth duration of the fourth state signal of refrigerant shortage sent by all the refrigeration internal machines exceeds the preset fourth duration;
judging whether the exhaust superheat degree of the air conditioner is larger than a preset superheat degree threshold value or not;
and if a third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, the fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold, controlling to increase the opening degree of the outdoor unit electronic expansion valve.
11. The apparatus of claim 10, wherein the adjustment module is further configured to:
and when a third duration time that the second specific gravity exceeds the second specific gravity threshold exceeds the third duration time, a fourth duration time exceeds the fourth duration time, and the exhaust superheat degree is greater than the superheat degree threshold and is not simultaneously met, controlling and maintaining the current opening degree of the outer machine electronic expansion valve.
12. The apparatus of claim 9, wherein the obtaining module is specifically configured to:
matching the state parameters with at least one preset state identification strategy respectively;
and controlling the refrigerating inner machine to send out the state signal according to the state parameter and the matching result of each state identification strategy.
13. The apparatus of claim 12, further comprising: a superheat degree adjusting module; the superheat degree adjusting module is used for:
and when the state signal is the first state signal, determining a target state identification strategy for triggering the first state signal, and correcting the current target superheat degree according to the target state identification strategy.
14. The apparatus of claim 13, wherein the superheat adjustment module is further to:
when the target state identification strategy is a preset first state identification strategy, controlling to correct the target superheat degree to a preset superheat degree until the first state signal is changed from the preset corresponding target state identification strategy to other preset state identification strategies;
and when the target state identification strategy is a preset second state identification strategy, controlling to reduce the target superheat degree until the target state identification strategy is changed into other preset state identification strategies.
15. The apparatus of claim 14, wherein the obtaining module is further configured to:
in the process of respectively matching state parameters with at least one preset state identification strategy, if the state parameters are simultaneously matched with a plurality of state identification strategies to trigger generation of the first state signal, acquiring the priority of each state identification strategy in the plurality of state identification strategies, and controlling sending of the first state signal triggered by the state identification strategy with high priority.
16. The apparatus of any one of claims 9-15, further comprising: an anti-freezing control module; the anti-freezing control module is used for:
acquiring the inlet temperature of the refrigerant;
judging whether an indoor unit anti-freezing control flow is entered or not according to the entering temperature and the state signal of the refrigeration indoor unit;
if the entering temperature is less than or equal to a preset first temperature threshold value and the state signal is not the state signal with the surplus refrigerant, controlling to enter an anti-freezing process of the indoor unit; the refrigerant surplus state signal comprises the second state signal and a third state signal;
continuously detecting the entry temperature, and controlling to exit the anti-freezing process of the internal machine if the entry temperature is greater than or equal to a preset second temperature threshold value or the state signal is a state signal with insufficient refrigerant; the refrigerant shortage state signal comprises the first state signal and a fourth state signal.
17. An air conditioner characterized by comprising the control device of the air conditioner according to any one of claims 9 to 16.
18. An electronic device comprising a memory, a processor;
wherein the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory, for implementing the control method of the air conditioner according to any one of claims 1 to 8.
19. A non-transitory computer-readable storage medium on which a computer program is stored, wherein the program, when executed by a processor, implements the control method of the air conditioner according to any one of claims 1 to 8.
CN201810603192.3A 2018-06-12 2018-06-12 Control method and device of air conditioner and air conditioner with control device Active CN108518808B (en)

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CN111854032B (en) * 2020-07-13 2021-09-21 珠海格力电器股份有限公司 Control method of electronic expansion valve, control method of air conditioner and air conditioner
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