CN112902401B - Air conditioner and electronic expansion valve control method - Google Patents
Air conditioner and electronic expansion valve control method Download PDFInfo
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- CN112902401B CN112902401B CN202110118588.0A CN202110118588A CN112902401B CN 112902401 B CN112902401 B CN 112902401B CN 202110118588 A CN202110118588 A CN 202110118588A CN 112902401 B CN112902401 B CN 112902401B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- 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
Abstract
The invention discloses an air conditioner and an electronic expansion valve control method, wherein the method comprises the following steps: when the electronic expansion valve is opened for the first time, determining a target step percentage of the electronic expansion valve based on a target temperature, and determining an actual step percentage based on the target step percentage and a second preset formula to send the actual step percentage to the electronic expansion valve; when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the actual step number percentage of the current period based on the step number change percentage, the step number percentage of the previous period, the first preset formula and the second preset formula, so as to send the actual step number percentage of the current period to the electronic expansion valve, thereby accurately controlling the electronic expansion valve when the flow characteristic curve of the electronic expansion valve is nonlinear.
Description
Technical Field
The present disclosure relates to the field of air conditioning control, and more particularly, to an air conditioner and an electronic expansion valve control method.
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.
In the prior art, during the running process of the system, the control algorithm generally defaults the characteristic curve of the expansion valve to be linear change, and on the basis, the control program periodically sends the characteristic curve to the electronic expansion valve according to the target temperature for the step number required in the current period. When the flow characteristic curve of the electronic expansion valve is in nonlinear change, the same valve step number change has great difference with the change of the actual flow of the valve, so that the control output result deviates from the expected value, the undershoot and overshoot of the expansion valve are easily caused, the control of each part of the system is not matched, the system fluctuates, and the stable operation is not easy.
Therefore, how to realize the accurate control of the electronic expansion valve when the flow characteristic curve of the electronic expansion valve is nonlinear is a technical problem to be solved at present.
Disclosure of Invention
The invention provides an air conditioner, which is used for solving the technical problem that the electronic expansion valve cannot be accurately controlled when the flow characteristic curve of the electronic expansion valve is nonlinear in the prior art, and comprises:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve and the evaporator;
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;
the condenser is used for radiating heat to the cooling water to condense the high-temperature and high-pressure refrigerant gas into high-temperature and high-pressure refrigerant liquid and discharging the high-temperature and high-pressure refrigerant liquid to the electronic expansion valve;
the electronic expansion valve is used for adjusting the flow of the refrigerant liquid;
an evaporator for evaporating the low-temperature low-pressure refrigerant liquid into low-temperature low-pressure refrigerant gas by absorbing heat from the chilled water and discharging the low-temperature low-pressure refrigerant gas to the compressor;
a controller configured to:
when the electronic expansion valve is opened for the first time, determining a target step percentage of the electronic expansion valve based on a target temperature, and determining an actual step percentage based on the target step percentage and a second preset formula to send the actual step percentage to the electronic expansion valve;
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the actual step number percentage of the current period based on the step number change percentage, the step number percentage of the previous period, a first preset formula and a second preset formula so as to send the actual step number percentage of the current period to the electronic expansion valve;
the first preset formula is a formula that flow percentage changes with step percentage, the second preset formula is a formula that step percentage changes with flow percentage, and the target difference value is determined based on the target temperature.
In some embodiments, the controller is configured to:
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the flow percentage of the previous period based on the step percentage of the previous period and a first preset formula;
and determining the target flow percentage of the current period based on the flow percentage of the previous period, and determining the actual step percentage of the current period based on the second preset formula and the target flow percentage of the current period so as to send the actual step percentage of the current period to the electronic expansion valve.
In some embodiments, the controller is configured to:
generating a second flow characteristic curve graph based on a first flow characteristic curve graph of the electronic expansion valve, wherein the abscissa of the first flow characteristic curve graph is the step number, the ordinate of the first flow characteristic curve graph is the flow, the abscissa of the second flow characteristic curve graph is the step percentage, and the ordinate of the second flow characteristic curve graph is the flow percentage;
the first preset formula is determined based on the second flow profile.
In some embodiments, the first preset formula is specifically:
；
wherein y is the flow percentage and x is the step percentage.
In some embodiments, the second preset formula is specifically:
；
wherein y is the flow percentage and x is the step percentage.
In some embodiments, the controller is configured to:
when the electronic expansion valve is opened for the first time, determining a target step number of the electronic expansion valve based on the target temperature;
the target step percentage is determined based on the target step number and a maximum step number of the electronic expansion valve.
In some embodiments, the controller is configured to:
and when the electronic expansion valve is not opened for the first time, taking the sum of the flow percentage of the previous cycle and the step number change percentage of the current cycle as the target flow percentage of the current cycle.
Correspondingly, the invention also provides a control method of the electronic expansion valve, which is applied to an air conditioner comprising a refrigerant circulation loop, a compressor, a condenser, the electronic expansion valve, an evaporator and a controller, and comprises the following steps:
when the electronic expansion valve is opened for the first time, determining a target step percentage of the electronic expansion valve based on a target temperature, and determining an actual step percentage based on the target step percentage and a second preset formula to send the actual step percentage to the electronic expansion valve;
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the actual step number percentage of the current period based on the step number change percentage, the step number percentage of the previous period, a first preset formula and a second preset formula so as to send the actual step number percentage of the current period to the electronic expansion valve;
the first preset formula is a formula that flow percentage changes with step percentage, the second preset formula is a formula that step percentage changes with flow percentage, and the target difference value is determined based on the target temperature.
In some embodiments, prior to determining the target step percentage for the electronic expansion valve based on the target temperature, further comprising:
generating a second flow characteristic curve graph based on a first flow characteristic curve graph of the electronic expansion valve, wherein the abscissa of the first flow characteristic curve graph is the step number, the ordinate of the first flow characteristic curve graph is the flow, the abscissa of the second flow characteristic curve graph is the step percentage, and the ordinate of the second flow characteristic curve graph is the flow percentage;
the first preset formula is determined based on the second flow profile.
In some embodiments, the actual step percentage of the current cycle is determined based on the step number change percentage, the step percentage of the previous cycle, the first preset formula and the second preset formula, specifically:
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the flow percentage of the previous period based on the step percentage of the previous period and a first preset formula;
and determining the target flow percentage of the current period based on the flow percentage of the previous period, and determining the actual step percentage of the current period based on the second preset formula and the target flow percentage of the current period so as to send the actual step percentage of the current period to the electronic expansion valve.
Compared with the prior art, the application has the following beneficial effects:
the invention discloses an air conditioner and an electronic expansion valve control method, wherein the air conditioner comprises a refrigerant circulation loop, a compressor, a condenser, an electronic expansion valve, an evaporator and a controller, and is configured to: a controller configured to: when the electronic expansion valve is opened for the first time, determining a target step percentage of the electronic expansion valve based on a target temperature, and determining an actual step percentage based on the target step percentage and a second preset formula to send the actual step percentage to the electronic expansion valve;
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the actual step number percentage of the current period based on the step number change percentage, the step number percentage of the previous period, the first preset formula and the second preset formula, so as to send the actual step number percentage of the current period to the electronic expansion valve, thereby accurately controlling the electronic expansion valve when the flow characteristic curve of the electronic expansion valve is nonlinear change, and reducing undershoot and overshoot of the electronic expansion valve.
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 schematic structural diagram of an air conditioner according to an embodiment of the present application;
FIG. 2 is a flow characteristic diagram of an electronic expansion valve of the prior art;
FIG. 3 is a graph of flow characteristics of an electronic expansion valve according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a control method of an electronic expansion valve according to an embodiment of the present application.
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.
Fig. 1 is a schematic view showing a structure of an air conditioner according to the present application, in which the air conditioner performs a refrigerating cycle of the air conditioner by using a compressor, a condenser, an electronic 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 low-temperature low-pressure refrigerant gas from the evaporator becomes the high-temperature high-pressure refrigerant gas, and the compressed refrigerant gas is discharged. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released into the cooling water through the condensation process.
The electronic 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 electronic 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. In the whole cycle, the water chiller is used for preparing cold water, and then the cold water exchanges heat with indoor air through the tail ends of a fan coil and the like.
As described in the background art, in the running process of the air conditioner, the characteristic curve of the electronic expansion valve is generally defaulted to be linear change, and the number of steps required by the current period of the electronic expansion valve is determined according to the target temperature, namely the target number of steps, but when the flow characteristic curve is nonlinear change, the actual flow corresponding to the calculated target number of steps is greatly deviated, so that the air conditioner and the electronic expansion valve control method are provided, and the electronic expansion valve can be accurately controlled when the flow characteristic curve is nonlinear.
To further describe the solution of the present application, in one example of the present application, the air conditioner includes:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve and the evaporator;
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;
the condenser is used for radiating heat to the cooling water to condense the high-temperature and high-pressure refrigerant gas into high-temperature and high-pressure refrigerant liquid and discharging the high-temperature and high-pressure refrigerant liquid to the electronic expansion valve;
the electronic expansion valve is used for adjusting the flow of the refrigerant liquid;
an evaporator for evaporating the low-temperature low-pressure refrigerant liquid into low-temperature low-pressure refrigerant gas by absorbing heat from the chilled water and discharging the low-temperature low-pressure refrigerant gas to the compressor;
a controller configured to:
when the electronic expansion valve is opened for the first time, determining a target step percentage of the electronic expansion valve based on a target temperature, and determining an actual step percentage based on the target step percentage and a second preset formula to send the actual step percentage to the electronic expansion valve;
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the actual step number percentage of the current period based on the step number change percentage, the step number percentage of the previous period, a first preset formula and a second preset formula so as to send the actual step number percentage of the current period to the electronic expansion valve;
the first preset formula is a formula that flow percentage changes with step percentage, the second preset formula is a formula that step percentage changes with flow percentage, and the target difference value is determined based on the target temperature.
In the embodiment of the application, when the electronic expansion valve is opened for the first time, that is, when the air conditioning system is just started, the parameter of the electronic expansion valve needs to be adjusted, the target step percentage is determined according to the target temperature required to be reached, the target step percentage is the ideal step percentage required to be reached, but the maximum step number of the electronic expansion valve which needs to be opened 240 steps is calculated to be 480 steps, which is equivalent to 50% of the step percentage, the actual control purpose is that the desired flow percentage is also 50%, and if no correction is made, as shown in fig. 2, when the step percentage is 50%, the flow percentage is 24%, which is obviously different from the flow percentage expected by us, so that the valve opening is too small, the operation of each component is not optimally matched, the operation of the unit in a better state is not ensured, and therefore the actual step percentage needs to be determined according to the target step percentage and the second preset formula, and the actual step percentage is sent to the electronic expansion valve, so that the accurate control of the electronic expansion valve is realized.
In the running process of the air conditioner, a determined step percentage is generally calculated only when the electronic expansion valve or the system is started for the first time and is sent to the expansion valve, and in the steady running process of the air conditioner, a step change percentage of the current period is generally determined based on a target difference value of the current period, wherein the target difference value is determined based on a target temperature, the step change percentage is a ratio of the target difference value to the total step number, and an actual step percentage of the current period is determined based on the step change percentage, the step percentage of the last period, a first preset formula and a second preset formula so as to send the actual step percentage of the current period to the electronic expansion valve.
To determine the first preset formula, in some embodiments, the controller is configured to:
generating a second flow characteristic curve graph based on a first flow characteristic curve graph of the electronic expansion valve, wherein the abscissa of the first flow characteristic curve graph is the step number, the ordinate of the first flow characteristic curve graph is the flow, the abscissa of the second flow characteristic curve graph is the step percentage, and the ordinate of the second flow characteristic curve graph is the flow percentage;
the first preset formula is determined based on the second flow profile.
In this embodiment, as shown in fig. 2, a first flow characteristic curve diagram in the prior art of the electronic expansion valve is shown in fig. 2, an abscissa of the first flow characteristic curve diagram is a step number, an ordinate of the first flow characteristic curve diagram is a flow, in order to accurately control the electronic expansion valve when the characteristic curve of the electronic expansion valve is nonlinear, a second flow characteristic curve diagram is generated based on the first flow characteristic curve diagram of the electronic expansion valve, an abscissa of the second flow characteristic curve diagram is a step percentage, an ordinate of the second flow characteristic curve diagram is a flow percentage, the second flow characteristic curve diagram is shown in fig. 3, the first preset formula is simultaneously drawn according to the second flow characteristic curve, and then an inverse function of the first preset formula is obtained, and the inverse function is used as a second preset formula.
To effect control of the electronic expansion valve, in some embodiments, the controller is configured to:
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the flow percentage of the previous period based on the step percentage of the previous period and a first preset formula;
and determining the target flow percentage of the current period based on the flow percentage of the previous period, and determining the actual step percentage of the current period based on the second preset formula and the target flow percentage of the current period so as to send the actual step percentage of the current period to the electronic expansion valve.
Specifically, the flow percentage of the previous cycle is determined through the step percentage of the previous cycle and a first preset formula, the flow percentage of the previous cycle and the step change percentage of the current cycle are added, the obtained sum is used as the target flow percentage of the current cycle, the target flow percentage is brought into a second preset formula, the actual step percentage is obtained, and the actual step percentage of the current cycle is sent to the electronic expansion valve, so that the accurate control of the electronic expansion valve is realized.
To determine the first preset formula, in some embodiments, the first preset formula is specifically:
；
wherein y is the flow percentage and x is the step percentage.
To determine the second preset formula, in some embodiments, the second preset formula is specifically:
；
wherein y is the flow percentage and x is the step percentage.
To determine the target step percentage, in some embodiments, the controller is configured to:
when the electronic expansion valve is opened for the first time, determining a target step number of the electronic expansion valve based on the target temperature;
the target step percentage is determined based on the target step number and a maximum step number of the electronic expansion valve.
In this embodiment, when the electronic expansion valve is opened for the first time, a target step number of the electronic expansion valve is determined according to a target temperature required to be reached, and a target step percentage is determined based on the target step number and a maximum step number of the electronic expansion valve, where the target step percentage is a ratio of the target step number to the maximum step number of the electronic expansion valve.
To determine the target flow percentage, in a preferred embodiment of the present application, the controller is configured to:
and when the electronic expansion valve is not opened for the first time, taking the sum of the flow percentage of the previous cycle and the step number change percentage of the current cycle as the target flow percentage of the current cycle.
The invention discloses an air conditioner and an electronic expansion valve control method, wherein the air conditioner comprises a refrigerant circulation loop, a compressor, a condenser, an electronic expansion valve, an evaporator and a controller, wherein the controller is configured to: when the electronic expansion valve is opened for the first time, determining a target step percentage of the electronic expansion valve based on a target temperature, and determining an actual step percentage based on the target step percentage and a second preset formula to send the actual step percentage to the electronic expansion valve;
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the actual step number percentage of the current period based on the step number change percentage, the step number percentage of the previous period, the first preset formula and the second preset formula, so as to send the actual step number percentage of the current period to the electronic expansion valve, thereby accurately controlling the electronic expansion valve when the flow characteristic curve of the electronic expansion valve is nonlinear change, and reducing undershoot and overshoot of the electronic expansion valve.
In order to further explain the technical idea of the present invention, the present invention also provides a control method of an electronic expansion valve, where the method is applied to an air conditioner including a refrigerant circulation loop, a compressor, a condenser, an electronic expansion valve, an evaporator and a controller, as shown in fig. 4, the specific steps of the method are as follows:
s401, when the electronic expansion valve is opened for the first time, determining a target step percentage of the electronic expansion valve based on a target temperature, and determining an actual step percentage based on the target step percentage and a second preset formula so as to send the actual step percentage to the electronic expansion valve.
In this step, in the embodiment of the present application, when the electronic expansion valve is opened for the first time, when the parameter of the electronic expansion valve needs to be adjusted, a target step percentage is determined according to the target temperature required to be reached, where the target step percentage is an ideal step percentage required to be reached, but assuming that the maximum step number of the electronic expansion valve which needs to be opened 240 steps is calculated to be 480 steps, which is equivalent to 50% of the step percentage, the actual control purpose is that the desired flow percentage is also 50%, and if no correction is made, when the step percentage is 50%, as shown in fig. 2, the flow percentage is 24%, which is obviously different from the flow percentage expected by us, so that the actual step percentage needs to be determined according to the target step percentage and the second preset formula, and the actual step percentage is sent to the electronic expansion valve, so as to realize the accurate control of the electronic expansion valve.
S402, when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the actual step percentage of the current period based on the step number change percentage, the step percentage of the previous period, the first preset formula and the second preset formula so as to send the actual step percentage of the current period to the electronic expansion valve.
The step change percentage of the current period is generally determined based on a target difference value of the current period, the target difference value is determined based on a target temperature, the step change percentage is a ratio of the target difference value to the total step number, and the actual step percentage of the current period is determined based on the step change percentage, the step percentage of the previous period, a first preset formula and a second preset formula to send the actual step percentage of the current period to the electronic expansion valve.
In order to accurately obtain the target opening degree of the electronic expansion valve, in some embodiments, before determining the target step percentage of the electronic expansion valve based on the target temperature, the method further includes:
generating a second flow characteristic curve graph based on a first flow characteristic curve graph of the electronic expansion valve, wherein the abscissa of the first flow characteristic curve graph is the step number, the ordinate of the first flow characteristic curve graph is the flow, the abscissa of the second flow characteristic curve graph is the step percentage, and the ordinate of the second flow characteristic curve graph is the flow percentage;
the first preset formula is determined based on the second flow profile.
In this embodiment, as shown in fig. 2, a first flow characteristic curve diagram in the prior art of the electronic expansion valve is shown in fig. 2, an abscissa of the first flow characteristic curve diagram is a step number, an ordinate of the first flow characteristic curve diagram is a flow, in order to accurately control the electronic expansion valve when the characteristic curve of the electronic expansion valve is nonlinear, a second flow characteristic curve diagram is generated based on the first flow characteristic curve diagram of the electronic expansion valve, an abscissa of the second flow characteristic curve diagram is a step percentage, an ordinate of the second flow characteristic curve diagram is a flow percentage, the second flow characteristic curve diagram is shown in fig. 3, the first preset formula is simultaneously drawn according to the second flow characteristic curve, and then an inverse function of the first preset formula is obtained, and the inverse function is used as a second preset formula.
To effect control of the electronic expansion valve, in some embodiments, the controller is configured to:
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the flow percentage of the previous period based on the step percentage of the previous period and a first preset formula;
and determining the target flow percentage of the current period based on the flow percentage of the previous period, and determining the actual step percentage of the current period based on the second preset formula and the target flow percentage of the current period so as to send the actual step percentage of the current period to the electronic expansion valve.
Specifically, the flow percentage of the previous cycle is determined through the step percentage of the previous cycle and a first preset formula, the flow percentage of the previous cycle and the step change percentage of the current cycle are added, the obtained sum is used as the target flow percentage of the current cycle, the target flow percentage is brought into a second preset formula, the actual step percentage is obtained, and the actual step percentage of the current cycle is sent to the electronic expansion valve, so that the accurate control of the electronic expansion valve is realized. .
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 and the evaporator;
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;
the condenser is used for radiating heat to the cooling water to condense the high-temperature and high-pressure refrigerant gas into high-temperature and high-pressure refrigerant liquid and discharging the high-temperature and high-pressure refrigerant liquid to the electronic expansion valve;
the electronic expansion valve is used for adjusting the flow of the refrigerant liquid;
an evaporator for evaporating the low-temperature low-pressure refrigerant liquid into low-temperature low-pressure refrigerant gas by absorbing heat from the chilled water and discharging the low-temperature low-pressure refrigerant gas to the compressor;
a controller configured to:
when the electronic expansion valve is opened for the first time, determining a target step percentage of the electronic expansion valve based on a target temperature, and determining an actual step percentage based on the target step percentage and a second preset formula to send the actual step percentage to the electronic expansion valve;
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the actual step number percentage of the current period based on the step number change percentage, the step number percentage of the previous period, a first preset formula and a second preset formula so as to send the actual step number percentage of the current period to the electronic expansion valve;
the first preset formula is a formula that flow percentage changes along with step percentage, the second preset formula is a formula that step percentage changes along with flow percentage, the target difference value is determined based on target temperature, and the target step percentage is consistent with the flow percentage;
wherein the controller is configured to:
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the flow percentage of the previous period based on the step percentage of the previous period and a first preset formula;
and determining the target flow percentage of the current period based on the flow percentage of the previous period, and determining the actual step percentage of the current period based on the second preset formula and the target flow percentage of the current period so as to send the actual step percentage of the current period to the electronic expansion valve.
2. The air conditioner of claim 1, wherein the controller is configured to:
generating a second flow characteristic curve graph based on a first flow characteristic curve graph of the electronic expansion valve, wherein the abscissa of the first flow characteristic curve graph is the step number, the ordinate of the first flow characteristic curve graph is the flow, the abscissa of the second flow characteristic curve graph is the step percentage, and the ordinate of the second flow characteristic curve graph is the flow percentage;
the first preset formula is determined based on the second flow profile.
3. The air conditioner of claim 1, wherein the first preset formula is specifically:
；
wherein y is the flow percentage and x is the step percentage.
4. The air conditioner of claim 1, wherein the second preset formula is specifically:
；
wherein y is the flow percentage and x is the step percentage.
5. The air conditioner of claim 1, wherein the controller is configured to:
when the electronic expansion valve is opened for the first time, determining a target step number of the electronic expansion valve based on the target temperature;
the target step percentage is determined based on the target step number and a maximum step number of the electronic expansion valve.
6. The air conditioner of claim 3, wherein the controller is configured to:
and when the electronic expansion valve is not opened for the first time, taking the sum of the flow percentage of the previous cycle and the step number change percentage of the current cycle as the target flow percentage of the current cycle.
7. An electronic expansion valve control method, wherein the method is applied to an air conditioner comprising a refrigerant circulation loop, a compressor, a condenser, an electronic expansion valve, an evaporator and a controller, and the method comprises the following steps:
when the electronic expansion valve is opened for the first time, determining a target step percentage of the electronic expansion valve based on a target temperature, and determining an actual step percentage based on the target step percentage and a second preset formula to send the actual step percentage to the electronic expansion valve;
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the actual step number percentage of the current period based on the step number change percentage, the step number percentage of the previous period, a first preset formula and a second preset formula so as to send the actual step number percentage of the current period to the electronic expansion valve;
the first preset formula is a formula that flow percentage changes along with step percentage, the second preset formula is a formula that step percentage changes along with flow percentage, the target difference value is determined based on target temperature, and the target step percentage is consistent with the flow percentage;
the actual step percentage of the current period is determined based on the step number change percentage, the step percentage of the previous period, the first preset formula and the second preset formula, and specifically is:
when the electronic expansion valve is not opened for the first time, determining the step number change percentage of the current period based on the target difference value of the current period, and determining the flow percentage of the previous period based on the step percentage of the previous period and a first preset formula;
and determining the target flow percentage of the current period based on the flow percentage of the previous period, and determining the actual step percentage of the current period based on the second preset formula and the target flow percentage of the current period so as to send the actual step percentage of the current period to the electronic expansion valve.
8. The method of claim 7, further comprising, prior to determining the target step percentage for the electronic expansion valve based on the target temperature:
generating a second flow characteristic curve graph based on a first flow characteristic curve graph of the electronic expansion valve, wherein the abscissa of the first flow characteristic curve graph is the step number, the ordinate of the first flow characteristic curve graph is the flow, the abscissa of the second flow characteristic curve graph is the step percentage, and the ordinate of the second flow characteristic curve graph is the flow percentage;
the first preset formula is determined based on the second flow profile.
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