CN113944990B - Air conditioner and control method - Google Patents

Air conditioner and control method Download PDF

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Publication number
CN113944990B
CN113944990B CN202010679208.6A CN202010679208A CN113944990B CN 113944990 B CN113944990 B CN 113944990B CN 202010679208 A CN202010679208 A CN 202010679208A CN 113944990 B CN113944990 B CN 113944990B
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Prior art keywords
value
air conditioner
step number
adjustment step
expansion valve
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CN113944990A (en
Inventor
李达君
尹发展
由秀玲
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Hisense Air Conditioning Co Ltd
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Hisense Air Conditioning 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • 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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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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)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner and a control method, wherein a controller is configured to acquire the exhaust superheat degree of the air conditioner in a current adjusting period, and generate a deviation value corresponding to the adjusting period according to the exhaust superheat degree and a preset target exhaust superheat degree; determining a change value between the deviation value corresponding to the adjusting period and the deviation value corresponding to the previous adjusting period; searching a result value corresponding to the deviation value and the variation value in a fuzzy control table, wherein the fuzzy control table is generated according to a preset membership function; determining a coefficient according to an ambient temperature outside the air conditioner; generating an adjustment step number according to the result value and the coefficient; based on the adjustment step number, the expansion valve is adjusted, so that the air conditioner can adapt to system adjustment requirements under different environmental temperatures and different loads, and the expansion valve can be quickly adjusted to enable the system to reach an equilibrium state.

Description

Air conditioner and control method
Technical Field
The present disclosure relates to the field of air conditioner control, and more particularly, to an air conditioner and a control method thereof.
Background
The expansion valve is a key component of the air conditioning system, and the speed and the stability of the adjustment of the expansion valve are related to the stability of the air conditioning system and the effect of refrigerating and heating, so that the comfort of a user is indirectly influenced. When the stability of the system is poor, long-term fluctuation can occur, and the service life of the air conditioner can be further influenced. Therefore, the regulation of the expansion valve is critical in air conditioning systems.
However, in the prior art, since PID control is currently used in a unit machine system, the PID control mode has a slow response speed, and is easy to overshoot to cause system pressure fluctuation. And when the P, I, D coefficient is determined, the system cannot change along with the change of the working environment of the system, so that the self-adaption is poor.
Therefore, how to provide a control method with strong self-adaptability for an air conditioner, which can adapt the air conditioner to the system adjustment requirements under different environmental temperatures and different loads, and can enable the system to reach an equilibrium state by quickly adjusting an expansion valve is a technical problem to be solved at present.
Disclosure of Invention
Since there is a problem in the prior art that the adaptation of an expansion valve in an air conditioner is poor and cannot be changed following the change of the working environment of a system, the present invention provides an air conditioner comprising:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers works as a condenser and the other heat exchanger works as an evaporator;
an indoor coil temperature sensor for detecting an indoor coil temperature;
an outdoor coil temperature sensor for detecting an outdoor coil temperature;
an outdoor environment temperature sensor for detecting an outdoor environment temperature;
the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between a condenser and an evaporator;
an exhaust gas temperature sensor for detecting an exhaust gas temperature;
in some embodiments, the controller is specifically configured to:
acquiring the exhaust superheat degree of the air conditioner in the current adjusting period, and generating a deviation value corresponding to the adjusting period according to the exhaust superheat degree and a preset target exhaust superheat degree;
determining a change value between the deviation value corresponding to the adjusting period and the deviation value corresponding to the previous adjusting period;
searching a result value corresponding to the deviation value and the variation value in a fuzzy control table, wherein the fuzzy control table is generated according to a preset membership function;
determining a coefficient according to an ambient temperature outside the air conditioner;
generating an adjustment step number according to the result value and the coefficient;
and adjusting the expansion valve based on the adjustment step number.
In some embodiments, the membership function includes at least:
the method comprises the steps of enabling the maximum positive value and the minimum negative value of an allowable deviation value of the air conditioner in the operation process, enabling the maximum positive value and the minimum negative value of an allowable variation value of the air conditioner in the operation process, enabling the output quantity of the membership function when the deviation value reaches the maximum positive value, and enabling the output quantity of the membership function when the variation value reaches the maximum positive value.
In some embodiments, the controller is specifically configured to:
and setting the coefficient to be a numerical value corresponding to the temperature interval according to the temperature interval where the ambient temperature is located.
In some embodiments, the step number is generated according to the result value and the coefficient, specifically:
Result＝Result＇/K；
wherein Result is the number of adjustment steps, result' is the Result value, and K is the coefficient.
In some embodiments, the controller is further specifically configured to:
if the adjustment step number is greater than 0, opening the expansion valve based on the adjustment step number;
if the adjustment step number is smaller than 0, closing the expansion valve based on the adjustment step number;
and if the adjustment step number is 0, maintaining the current opening of the expansion valve.
Correspondingly, the invention also provides a control method of the air conditioner, the method is applied to the air conditioner comprising a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor coil temperature sensor, an outdoor environment temperature sensor, a four-way valve, an exhaust temperature sensor and a controller, and the method comprises the following steps:
acquiring the exhaust superheat degree of the air conditioner in the current adjusting period, and generating a deviation value corresponding to the adjusting period according to the exhaust superheat degree and a preset target exhaust superheat degree;
determining a change value between the deviation value corresponding to the adjusting period and the deviation value corresponding to the previous adjusting period;
searching a result value corresponding to the deviation value and the variation value in a fuzzy control table, wherein the fuzzy control table is generated according to a preset membership function;
determining a coefficient according to an ambient temperature outside the air conditioner;
generating an adjustment step number according to the result value and the coefficient;
and adjusting the expansion valve based on the adjustment step number.
In some embodiments, the membership function includes at least:
the method comprises the steps of enabling the maximum positive value and the minimum negative value of an allowable deviation value of the air conditioner in the operation process, enabling the maximum positive value and the minimum negative value of an allowable variation value of the air conditioner in the operation process, enabling the output quantity of the membership function when the deviation value reaches the maximum positive value, and enabling the output quantity of the membership function when the variation value reaches the maximum positive value.
In some embodiments, the coefficient is determined according to the ambient temperature outside the air conditioner, and the method specifically comprises the following steps:
and setting the coefficient to be a numerical value corresponding to the temperature interval according to the temperature interval where the ambient temperature is located.
In some embodiments, the step number is generated according to the result value and the coefficient, specifically:
Result＝Result＇/K；
wherein Result is the number of adjustment steps, result' is the Result value, and K is the coefficient. In some embodiments, the expansion valve is adjusted based on the adjustment step number, specifically:
if the adjustment step number is greater than 0, opening the expansion valve based on the adjustment step number;
if the adjustment step number is smaller than 0, closing the expansion valve based on the adjustment step number;
and if the adjustment step number is 0, maintaining the current opening of the expansion valve.
According to the technical scheme, the exhaust superheat degree of the air conditioner in the current adjusting period is obtained, and a deviation value corresponding to the adjusting period is generated according to the exhaust superheat degree and a preset target exhaust superheat degree; determining a change value between the deviation value corresponding to the adjusting period and the deviation value corresponding to the previous adjusting period; searching a result value corresponding to the deviation value and the variation value in a fuzzy control table, wherein the fuzzy control table is generated according to a preset membership function; determining a coefficient according to an ambient temperature outside the air conditioner; generating an adjustment step number according to the result value and the coefficient; based on the adjustment step number, the expansion valve is adjusted, so that the air conditioner can adapt to system adjustment requirements under different environmental temperatures and different loads, and the expansion valve can be quickly adjusted to enable the system to reach an equilibrium state.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view showing an external appearance of an air conditioner of an embodiment;
fig. 2 is a circuit diagram showing an outline of the structure of the air conditioner of the embodiment;
fig. 3 is a block diagram showing an outline of a structure of a control system of an air conditioner;
fig. 4 is a schematic view illustrating a structure of an air conditioner according to an embodiment of the present invention;
fig. 5 is a flow chart illustrating a control method of an air conditioner according to an embodiment of the present invention;
FIG. 6 is a graph illustrating a membership function according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating another air conditioner control method according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The air conditioner in this application performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
The air conditioner 1 shown in fig. 1 includes: the indoor unit 3 is, for example, an indoor unit (shown in the figure), and the indoor unit is usually mounted on an indoor wall surface WL or the like. For another example, an indoor unit (not shown) is also an indoor unit mode.
The outdoor unit 2 is usually installed outdoors and is used for heat exchange in an indoor environment. In fig. 1, the outdoor unit 2 is located outdoors on the opposite side of the indoor unit 3 across the wall surface WL, and the outdoor unit 2 is indicated by a broken line.
Fig. 2 shows a circuit configuration of an air conditioner 1, and the air conditioner 1 includes a refrigerant circuit 10, and is capable of performing a vapor compression refrigeration cycle by circulating a refrigerant in the refrigerant circuit 10. The indoor unit 3 and the outdoor unit 2 are connected to each other by a connection pipe 4 to form a refrigerant circuit 10 through which a refrigerant circulates.
As shown in fig. 3, the air conditioner 1 includes a control unit 50 for controlling operations of the respective components in the air conditioner so that the respective components of the air conditioner 1 operate to realize respective predetermined functions of the air conditioner. A remote controller 5 is attached to the air conditioner 1, and the remote controller 5 has a function of communicating with the control unit 50 using, for example, infrared rays or other communication means. The remote controller 5 is used for various controls of the air conditioner by a user, and interaction between the user and the air conditioner is realized.
For further description of the solution of the present application, fig. 4 is a schematic structural diagram of an air conditioner according to an embodiment of the present application, specifically:
an exhaust gas temperature sensor 101 for detecting an exhaust gas temperature.
The controller 102 is configured to be configured to,
acquiring the exhaust superheat degree of the air conditioner in the current adjusting period, and generating a deviation value corresponding to the adjusting period according to the exhaust superheat degree and a preset target exhaust superheat degree;
determining a change value between the deviation value corresponding to the adjusting period and the deviation value corresponding to the previous adjusting period;
searching a result value corresponding to the deviation value and the variation value in a fuzzy control table, wherein the fuzzy control table is generated according to a preset membership function;
determining a coefficient according to an ambient temperature outside the air conditioner;
generating an adjustment step number according to the result value and the coefficient;
and adjusting the expansion valve based on the adjustment step number.
In order to control the expansion valve more precisely, in the preferred embodiment of the present application, the present invention proposes a control method that can be applied to the expansion valve of an air conditioner, wherein the control method of the expansion valve in the present invention uses a specific exhaust superheat degree as a target exhaust superheat degree to adjust, and only requires the exhaust temperature sensor and the coil temperature of the internal and external machines, without the participation of an intake sensor. The exhaust superheat degree is utilized to be adjusted as the target exhaust superheat degree, the heat exchange requirement of the air conditioner can be reflected more truly, the opening degree of the expansion valve is adjusted according to the requirement, then the purpose of meeting the requirements of room refrigeration and heating is achieved by adjusting the flow of the refrigerant, in addition, the change of the exhaust superheat degree is much smaller than the change of the exhaust temperature in the global environment temperature range, and the air conditioner can be calculated and determined simply and has high control precision.
It should be noted that, the scheme of the above preferred embodiment is only a specific implementation scheme provided in the present application, and only the exhaust temperature sensor and the coil temperature of the inner and outer machines are needed, and the exhaust superheat degree and the coil temperature obtained by other modes all belong to the protection scope of the present application.
In order to obtain the result value of the expansion valve more simply, in the preferred embodiment of the application, research shows that the adjustment result of the opening degree of the expansion valve needs to be processed differently according to different ambient temperatures, so that the adjustment result needs to be calculated through a fuzzy algorithm, and the purpose of stably adjusting the opening degree of the expansion valve can still be achieved under the working condition of the temperature in the whole field. The method uses the unitary quadratic function as the membership function, wherein the unitary quadratic function is used as a basic function model, is relatively simple to calculate and is converted into the function model, and the convergence speed is high when the calculated result has larger deviation, and the deviation value is more resistant to vibration when the calculated result has smaller deviation.
The membership function utilized by the control expansion valve of the present invention is shown in figure 6,
where ψe is the forward allowed maximum value of the offset value e, which represents the maximum positive value that the controller can handle during operation, and when the actual control parameter exceeds this value, it will be truncated by the controller. ζe is the exact value of the output when the deviation value e is the element of the kernel of the fuzzy set P, that is to say the output corresponding to the deviation value e reaching the maximum positive value. Ω is the negative allowed maximum value (absolute value) of the deviation value e, - Ω represents the minimum negative value that the controller can handle during operation, and will be truncated by the controller when the actual control parameter exceeds this value. ηe refers to the exact value of the output when the deviation value e is an element of the kernel of the fuzzy set N, that is to say the output corresponding to the deviation value e reaching a minimum negative value. ψΔ is the forward allowable maximum value of the derivative value Δe, which represents the maximum positive value that the controller can handle during operation, and will be truncated by the controller when the actual control parameter exceeds this value. ζΔrefers to the exact value of the output when the differential value Δe is an element of the kernel of the fuzzy set P, that is to say the output corresponding to when the differential value Δe reaches a positive maximum. Ω Δ is the negative allowed maximum of the derivative value Δe, - Ω Δ represents the minimum that the controller can handle during operation, and will be truncated by the controller when the actual control parameter exceeds this value. ηΔrefers to the exact value of the output when the differential value Δe is an element of the kernel of the fuzzy set P, that is to say the corresponding output when the differential value Δe reaches a minimum value. e represents the deviation value of the current exhaust superheat degree from the target exhaust superheat degree, and deltae represents the variation value of the deviation value and the deviation value at the moment of the last adjustment period.
It should be noted that, the solution of the above preferred embodiment is only one specific implementation solution proposed in the present application, and other ways of obtaining the result value of controlling the expansion valve are all within the protection scope of the present application.
In order to obtain a deviation value generated by the exhaust superheat degree and the target exhaust superheat degree, in a preferred embodiment of the present application, the exhaust superheat degree of the air conditioner in a current adjustment period is obtained, and a deviation value corresponding to the adjustment period is generated according to the exhaust superheat degree and a preset target exhaust superheat degree.
Specifically, a method for calculating a preset target exhaust superheat degree in an air conditioner comprises the steps of firstly obtaining the exhaust superheat degree of a current regulation period, and generating a deviation value of the current regulation period according to the target exhaust superheat degree and the exhaust superheat degree of the current regulation period.
It should be noted that, the solution of the above preferred embodiment is only one specific implementation solution provided in the present application, and different preset manners of target exhaust superheat degree all belong to the protection scope of the present application.
In a preferred embodiment of the present application, a change value between the deviation value corresponding to the adjustment period and the deviation value corresponding to the last adjustment period is determined.
In order to obtain a result value of adjusting the opening of the expansion valve, in a preferred embodiment of the present application, a result value corresponding to the deviation value and the variation value is searched in a fuzzy control table, and the fuzzy control table is generated according to a preset membership function.
Specifically, the fuzzy control table is obtained after fuzzification and definition according to the membership function in fig. 6, and the result value corresponding to the deviation value and the variation value is searched in the fuzzy control table.
It should be noted that, the solution of the above preferred embodiment is only one specific implementation solution provided in the present application, and all the different methods for generating the fuzzy control table belong to the protection scope of the present application.
In a preferred embodiment of the present application, the coefficient is determined based on the ambient temperature outside the air conditioner.
In a preferred embodiment of the present application, the number of adjustment steps is generated from the result value and the coefficient.
In a preferred embodiment of the present application, the expansion valve is adjusted based on the number of adjustment steps.
According to the technical scheme, the exhaust superheat degree of the air conditioner in the current adjusting period is obtained, and a deviation value corresponding to the adjusting period is generated according to the exhaust superheat degree and a preset target exhaust superheat degree; determining a change value between the deviation value corresponding to the adjusting period and the deviation value corresponding to the previous adjusting period; searching a result value corresponding to the deviation value and the variation value in a fuzzy control table, wherein the fuzzy control table is generated according to a preset membership function; determining a coefficient according to an ambient temperature outside the air conditioner; generating an adjustment step number according to the result value and the coefficient; based on the adjustment step number, the expansion valve is adjusted, so that the air conditioner can adapt to system adjustment requirements under different environmental temperatures and different loads, and the expansion valve can be quickly adjusted to enable the system to reach an equilibrium state.
Corresponding to the air conditioner in the embodiment of the present application, the embodiment of the present application further provides a control method of the air conditioner, where the method is applied to the air conditioner including a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor coil temperature sensor, an outdoor environment temperature sensor, a four-way valve, an exhaust temperature sensor, and a controller, as shown in fig. 5, the method includes:
step 201, obtaining the exhaust superheat degree of the air conditioner in the current adjustment period, and generating a deviation value corresponding to the adjustment period according to the exhaust superheat degree and a preset target exhaust superheat degree.
Step 202, determining a change value between the deviation value corresponding to the adjustment period and the deviation value corresponding to the previous adjustment period.
And 203, searching a result value corresponding to the deviation value and the variation value in a fuzzy control table, wherein the fuzzy control table is generated according to a preset membership function.
In a preferred embodiment of the present application, the membership function includes at least: the method comprises the steps of enabling the maximum positive value and the minimum negative value of an allowable deviation value of the air conditioner in the operation process, enabling the maximum positive value and the minimum negative value of an allowable variation value of the air conditioner in the operation process, enabling the output quantity of the membership function when the deviation value reaches the maximum positive value, and enabling the output quantity of the membership function when the variation value reaches the maximum positive value.
It should be noted that, the solution of the above preferred embodiment is only one specific implementation solution proposed in the present application, and all the generating methods of different membership functions belong to the protection scope of the present application.
In a preferred embodiment of the present application, the step number is generated according to the result value and the coefficient, specifically: result = Result'/K; wherein Result is the number of adjustment steps, result' is the Result value, and K is the coefficient.
It should be noted that, the solution of the above preferred embodiment is only one specific implementation solution proposed in the present application, and all the different methods for generating the adjustment steps belong to the protection scope of the present application.
In this step, the expansion valve is adjusted based on the adjustment step number, specifically: if the adjustment step number is greater than 0, opening the expansion valve based on the adjustment step number; if the adjustment step number is smaller than 0, closing the expansion valve based on the adjustment step number; and if the adjustment step number is 0, maintaining the current opening of the expansion valve.
And 204, determining a coefficient according to the ambient temperature outside the air conditioner.
In a preferred embodiment of the present application, the coefficient is determined according to the ambient temperature outside the air conditioner, specifically: and setting the coefficient to be a numerical value corresponding to the temperature interval according to the temperature interval where the ambient temperature is located.
It should be noted that the solution of the above preferred embodiment is only one specific implementation solution proposed in the present application, and other methods for determining the coefficients belong to the protection scope of the present application.
Step 205, generating an adjustment step number according to the result value and the coefficient.
And step 206, adjusting the expansion valve based on the adjustment step number.
Corresponding to the air conditioner in the embodiment of the present application, the embodiment of the present application further provides a control method of the air conditioner, where the method is applied to the air conditioner including a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor coil temperature sensor, an outdoor environment temperature sensor, a four-way valve, an exhaust temperature sensor, and a controller, as shown in fig. 7, the method includes:
step 301, an expansion valve adjusts a function.
Specifically, a membership function for adjusting the opening of the expansion valve is preset.
Step 302, the valve adjustment cycle time is up.
Specifically, when the expansion valve enters the adjustment time, step 303 is executed, and when the expansion valve does not enter the adjustment time, step 312 is executed.
In step 303, a deviation value e=current exhaust superheat-target exhaust superheat is calculated.
Specifically, a deviation value e is determined according to the exhaust temperature received by the exhaust temperature sensor and a preset target exhaust degree, when the air conditioner is in a heating mode, the current exhaust superheat degree=exhaust temperature-indoor side coil temperature, and when the air conditioner is in a refrigeration mode, the current exhaust superheat degree=exhaust temperature-outdoor side coil temperature.
In step 304, the variance Δe=variance at that time—variance of the last cycle is calculated.
Specifically, a deviation change value delta e is determined according to the deviation value e and the deviation value in the period of the last regulating expansion valve.
Step 305, searching the fuzzy control table according to the calculation result of the deviation value and the deviation variation value, and the searched result is result'.
Specifically, a Result' obtained by searching the fuzzy control table is searched according to the deviation value and the deviation change value before and after the adjustment period, and then the Result is processed according to different environment temperatures.
In step 306, the outdoor side environment is below T2 ℃.
Specifically, it is determined whether the ambient temperature outside the chamber is lower than T2 ℃, if yes, step 308 is performed, and if not, step 307 is performed.
Step 307, outdoor side environment is lower than T1 ℃.
Specifically, it is determined whether the ambient temperature outside the chamber is lower than T1 ℃, if yes, step 309 is executed, and if not, step 310 is executed.
In step 308, the coefficient is k=k3.
Specifically, when the ambient temperature of the outside of the chamber is < T3 ℃, the coefficient k=k3 and step 311 is performed.
In step 309, the coefficient is k=k2.
Specifically, when the ambient temperature outside the chamber is equal to or higher than T2 ℃, the coefficient k=k2 and step 311 is performed;
in step 310, the coefficient is k=k1.
Specifically, when the ambient temperature outside the chamber is equal to or greater than T1 ℃, the coefficient k=k1 and step 311 is performed.
Step 311, the number of expansion valve steps=result'/K.
Specifically, step 312 is performed and the number of adjustment steps of the expansion valve is Result'/K.
Step 312, exit.
Specifically, the opening degree of the expansion valve is adjusted according to the adjusting step number of the expansion valve.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (8)

1. An air conditioner, comprising:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the two heat exchangers works as a condenser and the other works as an evaporator;
an indoor coil temperature sensor for detecting an indoor coil temperature;
an outdoor coil temperature sensor for detecting an outdoor coil temperature;
an outdoor environment temperature sensor for detecting an outdoor environment temperature;
the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant circulation loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between a condenser and an evaporator;
an exhaust gas temperature sensor for detecting an exhaust gas temperature;
the controller is configured to be configured to control the controller,
acquiring the exhaust superheat degree of the air conditioner in the current adjusting period, and generating a deviation value corresponding to the adjusting period according to the exhaust superheat degree and a preset target exhaust superheat degree;
determining a change value between the deviation value corresponding to the adjusting period and the deviation value corresponding to the previous adjusting period;
searching a result value corresponding to the deviation value and the variation value in a fuzzy control table, wherein the fuzzy control table is generated according to a preset membership function;
determining a coefficient according to an ambient temperature outside the air conditioner;
generating an adjustment step number according to the result value and the coefficient, specifically:
Result＝Result＇/K；
wherein Result is the adjustment step number, result' is the Result value, and K is the coefficient;
and adjusting the expansion valve based on the adjustment step number.
2. The air conditioner of claim 1, wherein the membership function comprises at least:
the method comprises the steps of enabling the maximum positive value and the minimum negative value of an allowable deviation value of the air conditioner in the operation process, enabling the maximum positive value and the minimum negative value of an allowable variation value of the air conditioner in the operation process, enabling the output quantity of the membership function when the deviation value reaches the maximum positive value, and enabling the output quantity of the membership function when the variation value reaches the maximum positive value.
3. The air conditioner of claim 1, wherein the controller is further specifically configured to:
and setting the coefficient to be a numerical value corresponding to the temperature interval according to the temperature interval where the ambient temperature is located.
4. The air conditioner of claim 1, wherein the controller is further configured to:
if the adjustment step number is greater than 0, opening the expansion valve based on the adjustment step number;
if the adjustment step number is smaller than 0, closing the expansion valve based on the adjustment step number;
and if the adjustment step number is 0, maintaining the current opening of the expansion valve.
5. A control method, characterized in that the method is applied to an air conditioner including a refrigerant circulation circuit, a compressor, an expansion valve, an outdoor heat exchanger and an indoor heat exchanger, an indoor coil temperature sensor and an outdoor coil temperature sensor, an outdoor environment temperature sensor, a four-way valve, an exhaust temperature sensor, and a controller, the method comprising:
acquiring the exhaust superheat degree of the air conditioner in the current adjusting period, and generating a deviation value corresponding to the adjusting period according to the exhaust superheat degree and a preset target exhaust superheat degree;
determining a change value between the deviation value corresponding to the adjusting period and the deviation value corresponding to the previous adjusting period;
searching a result value corresponding to the deviation value and the variation value in a fuzzy control table, wherein the fuzzy control table is generated according to a preset membership function;
determining a coefficient according to an ambient temperature outside the air conditioner;
generating an adjustment step number according to the result value and the coefficient, specifically:
Result＝Result＇/K；
wherein Result is the adjustment step number, result' is the Result value, and K is the coefficient;
and adjusting the expansion valve based on the adjustment step number.
6. The method of claim 5, wherein the membership function comprises at least:
the method comprises the steps of enabling the maximum positive value and the minimum negative value of an allowable deviation value of the air conditioner in the operation process, enabling the maximum positive value and the minimum negative value of an allowable variation value of the air conditioner in the operation process, enabling the output quantity of the membership function when the deviation value reaches the maximum positive value, and enabling the output quantity of the membership function when the variation value reaches the maximum positive value.
7. The method according to claim 5, characterized in that the coefficient is determined from the ambient temperature outside the air conditioner, in particular:
and setting the coefficient to be a numerical value corresponding to the temperature interval according to the temperature interval where the ambient temperature is located.
8. The method according to claim 5, characterized in that the expansion valve is adjusted based on the number of adjustment steps, in particular:
if the adjustment step number is greater than 0, opening the expansion valve based on the adjustment step number;
if the adjustment step number is smaller than 0, closing the expansion valve based on the adjustment step number;
and if the adjustment step number is 0, maintaining the current opening of the expansion valve.
CN202010679208.6A 2020-07-15 2020-07-15 Air conditioner and control method Active CN113944990B (en)

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