CN111878964B - Control method and device of electronic expansion valve, air conditioner and storage medium - Google Patents

Control method and device of electronic expansion valve, air conditioner and storage medium Download PDF

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CN111878964B
CN111878964B CN202010730725.1A CN202010730725A CN111878964B CN 111878964 B CN111878964 B CN 111878964B CN 202010730725 A CN202010730725 A CN 202010730725A CN 111878964 B CN111878964 B CN 111878964B
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degree
value
expansion valve
electronic expansion
opening
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CN111878964A (en
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宋林林
胡立志
王知恒
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature

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

Abstract

The invention provides a control method and device of an electronic expansion valve, an air conditioner and a storage medium. The control method comprises the following steps: acquiring indoor temperature, indoor set temperature, supercooling degree or superheat degree, target supercooling degree or target superheat degree; and acquiring an opening adjusting value of the electronic expansion valve by adopting a fuzzy control method, and adjusting the electronic expansion valve according to the opening adjusting value. According to the invention, the valve step size of the electronic expansion valve of the air conditioner in the heating or refrigerating process is corrected through fuzzy control on the basis of the combined control of the supercooling degree or the superheat degree and the room temperature on the basis of the supercooling degree/superheat degree control, so that the opening degree of the electronic expansion valve more suitable for the current state is obtained, the control precision of the electronic expansion valve is improved, the adaptability to different conditions is improved, and the heat exchange efficiency and the system stability of the air conditioner are effectively improved.

Description

Control method and device of electronic expansion valve, air conditioner and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of an electronic expansion valve, an air conditioner and a storage medium.
Background
The current air conditioner heat exchange system mostly adopts an electronic expansion valve to control and adjust the flow rate of a refrigerant, thereby improving the heat conversion efficiency of the refrigerant, ensuring that the heat exchange system can consume the minimum energy and providing the best heat exchange effect. The conventional expansion valve adjusting mode is mainly based on superheat degree or supercooling degree to periodically control the expansion valve, but the mode of controlling only through superheat degree or supercooling degree has poor adaptability and weak adjusting capability, and the conditions of poor heat exchange and comfort influence often occur.
Disclosure of Invention
The invention solves the problems that the prior mode for periodically controlling the electronic expansion valve based on the superheat degree or the supercooling degree has poor adaptability and limited regulating capability.
In order to solve the above problem, the present invention provides a control method of an electronic expansion valve, including:
acquiring indoor temperature, indoor set temperature, supercooling degree or superheat degree, target supercooling degree or target superheat degree;
acquiring a first opening pre-adjustment value by using a first fuzzy control model according to the indoor temperature, the change rate of the indoor temperature and the indoor set temperature, and acquiring a second opening pre-adjustment value by using a second fuzzy control model according to the superheat degree, the change rate of the superheat degree and the target superheat degree or according to the supercooling degree, the change rate of the supercooling degree and the target supercooling degree;
and acquiring an opening degree adjusting value of the electronic expansion valve through the superposition control of the first opening degree pre-adjusting value and the second opening degree pre-adjusting value according to the superheat degree or the range of the supercooling degree, and adjusting the electronic expansion valve according to the opening degree adjusting value.
The invention corrects the valve step size of the electronic expansion valve of the air conditioner in the heating or refrigerating process by fuzzy control based on the combined control of the supercooling degree or the superheat degree and the room temperature, participates the variable of the change rate of the corresponding parameter (the superheat degree or the supercooling degree, the room temperature) and other parameters in the calculation when performing the supercooling degree/superheat degree control and the room temperature control, obtains the opening pre-adjusting value of the output variable electronic expansion valve which is more matched with the current parameter, and then superposes the supercooling degree or superheat degree control and the room temperature control output variable, thereby obtaining the electronic expansion valve opening which is more suitable for the current state, improving the control precision of the electronic expansion valve, the adaptability to different conditions and effectively improving the heat exchange efficiency and the system stability of the air conditioner.
Further, the first fuzzy control model is:
Figure BDA0002603207430000021
ΔPP1＝UV(t)；
wherein, Δ PP1For a first opening degree pre-adjustment value, UV (t) is the opening degree of the electronic expansion valve of the room temperature control output, UV (t-L) is the opening degree of the electronic expansion valve in the previous period, L is the control period, Y is the opening degree of the electronic expansion valve in the previous period1(t) is the room temperature, Y1(t-L) is the room temperature of the previous cycle,
Figure BDA0002603207430000022
Figure BDA0002603207430000023
r (t) is the indoor set temperature, omega is a control speed determining factor, zeta is a damping coefficient, and B is a control critical value;
the second fuzzy control model is as follows:
Figure BDA0002603207430000024
ΔPP2＝USC(t)；
wherein, Δ PP2For the second opening degree preset value, USC (t) is the opening degree of the electronic expansion valve output by superheat degree control or supercooling degree control, USC (t-L) is the opening degree of the electronic expansion valve in the previous period, L is the control period, Y is the opening degree of the electronic expansion valve in the previous period2(t) is the degree of superheat or the degree of supercooling, Y2(t-L) is the degree of superheat or supercooling of the previous cycle,
Figure BDA0002603207430000025
r (t) is the target superheat degree or the target supercooling degree, omega is a control speed determining factor, zeta is a damping coefficient, and B is a control critical value.
Therefore, the calculated opening degree of the expansion valve is reasonable, the current environment requirement is met, the real-time performance is higher, and timely response can be made according to the environment change.
Further, the acquiring the opening degree adjustment value of the electronic expansion valve by the superimposed control of the first opening degree pre-adjustment value and the second opening degree pre-adjustment value includes: superposing the first opening pre-adjustment value and the second opening pre-adjustment value according to the following formula to obtain the opening adjustment value delta P:
ΔP＝f1(x)×ΔPP1+f2(x)×ΔPP2；
wherein, Δ PP1For said first opening pre-adjustment value, Δ PP2Is said second opening degree preset value, f1(x) Is a first membership function, f2(x) Is a second membership function, and f1(x) And f2(x) The following relationship is satisfied:
f1(x)+f2(x)＝1。
the invention participates the room temperature control under the premise of ensuring the safety of the superheat degree or the supercooling degree, switches the supercooling degree/superheat degree control and the room temperature control through fuzzy control, effectively regulates the capacity output of the unit and has strong scene adaptability.
Further, the first membership function or the second membership function comprises one of a triangular membership function, a trapezoidal membership function and a generalized bell-shaped membership function.
Further, the first membership function is:
Figure BDA0002603207430000031
wherein x is the superheat degree or the supercooling degree, and a, b, c and d are different set values.
Therefore, when the superheat degree or the supercooling degree is in an excessively large or small range, the control based on the superheat degree or the supercooling degree is adopted to ensure the reliability of the system, when the superheat degree or the supercooling degree is in a large or small range, the joint control of supercooling degree/superheat degree control and room temperature control is adopted, and when the superheat degree or the supercooling degree is in a middle range, the control based on the indoor temperature is adopted.
Further, when x is the supercooling degree, the value of a is 3-9 ℃, the value of b is 8-14 ℃, the value of c is 22-28 ℃, and the value of d is 27-33 ℃.
Further, after the obtaining of the opening adjustment value of the electronic expansion valve, the method further includes: and correcting the opening degree adjusting value according to the following correction rule:
when the supercooling degree is smaller than the supercooling degree set value, the corrected opening degree adjusting value is equal to the opening degree adjusting value minus a first correction value;
when the supercooling degree is greater than or equal to the first preset value, judging whether the temperature difference is greater than a temperature difference set value, wherein the temperature difference is the difference between the indoor temperature and the indoor set temperature;
when the temperature difference is larger than the temperature difference set value, the corrected opening degree adjusting value is equal to the opening degree adjusting value plus a second correction value;
and when the temperature difference is smaller than or equal to the temperature difference set value, the corrected opening degree adjusting value is equal to the opening degree adjusting value.
Through revising the opening adjustment value, obtain the electronic expansion valve opening adjustment volume that adapts to current state more to improve heat exchange efficiency, promote user's comfort level.
Further, the supercooling degree set value is 5 ℃, the first correction value is 12, the temperature difference set value is 1 ℃, and the second correction value is 5.
In the heating mode, the opening degree adjusting value of the electronic expansion valve is obtained based on the combined control of supercooling degree control and room temperature control, the valve opening degree when the supercooling degree is less than 5 ℃ is corrected, the temperature difference is judged when the supercooling degree is in a normal range, and the valve opening degree is corrected when the temperature difference is larger and exceeds 1 ℃, so that the opening degree adjusting value of the electronic expansion valve which is more suitable for the current condition is obtained.
The present invention also provides a control device for an electronic expansion valve, comprising:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring indoor temperature, indoor set temperature, supercooling degree or superheat degree, target supercooling degree or target superheat degree;
the control unit is used for acquiring a first preset opening value by using a first fuzzy control model according to the indoor temperature, the change rate of the indoor temperature and the indoor set temperature, and acquiring a second preset opening value by using a second fuzzy control model according to the superheat degree, the change rate of the superheat degree and the target superheat degree or according to the supercooling degree, the change rate of the supercooling degree and the target supercooling degree;
and the control unit is also used for carrying out superposition control on the first opening degree pre-regulation value and the second opening degree pre-regulation value according to the range of the superheat degree or the supercooling degree to obtain the opening degree regulation value of the electronic expansion valve.
The present invention also provides an air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the control method of the electronic expansion valve as described above.
The present invention also provides a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements a method of controlling an electronic expansion valve as described above.
Compared with the prior art, the electronic expansion valve control device and the air conditioner provided by the invention have the same beneficial effects as the electronic expansion valve control method, and are not repeated herein.
Drawings
FIG. 1 is a flow chart of a method of controlling an electronic expansion valve in an embodiment of the present invention;
fig. 2 is a flowchart illustrating the detailed control of the electronic expansion valve according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, an embodiment of the invention provides a control method of an electronic expansion valve, including:
acquiring indoor temperature, indoor set temperature, supercooling degree or superheat degree, target supercooling degree or target superheat degree; it should be understood that in the heating mode, the supercooling degree and the target supercooling degree are obtained, and in the cooling mode, the superheat degree and the target superheat degree are obtained;
acquiring a first opening pre-adjustment value by using a first fuzzy control model according to the indoor temperature, the change rate of the indoor temperature and the indoor set temperature, and acquiring a second opening pre-adjustment value by using a second fuzzy control model according to the superheat degree, the change rate of the superheat degree and the target superheat degree or according to the supercooling degree, the change rate of the supercooling degree and the target supercooling degree;
and performing superposition control on the first opening degree pre-regulation value and the second opening degree pre-regulation value according to the range of the superheat degree or the supercooling degree to obtain an opening degree regulation value of the electronic expansion valve, and regulating the electronic expansion valve according to the opening degree regulation value.
In the present embodiment, the indoor temperature, the rate of change of the indoor temperature, and the indoor set temperature are input to the first controller, and the first controller is used to perform control based on the indoor temperature, which will be referred to as indoor temperature control hereinafter for convenience of description. In the cooling mode, the superheat degree change rate, and the target superheat degree are input to the second controller, and the control based on the superheat degree is performed by the second controller, or in the heating mode, the subcooling degree change rate, and the target subcooling degree are input to the second controller, and the control based on the subcooling degree is performed by the second controller, and the control based on the superheat degree or the subcooling degree is hereinafter simply referred to as subcooling degree/superheat degree control. The control based on the degree of superheat or the degree of supercooling is to control the opening degree of the electronic expansion valve by outputting the amount of change in the opening degree of the electronic expansion valve through calculation by the controller, with the degree of superheat or the degree of supercooling being an input variable. The control based on the indoor temperature is to control the opening degree of the electronic expansion valve by outputting the amount of change in the opening degree of the electronic expansion valve through calculation by the controller, using the indoor temperature as an input variable. In this embodiment, the first controller and the second controller both adopt a fuzzy PID control method, where the first controller outputs a first preset opening value, and the second controller outputs a second preset opening value. And performing joint control of supercooling degree/superheat degree control and room temperature control on the electronic expansion valve by adopting a fuzzy control method according to the range of the superheat degree or the superheat degree, and obtaining an opening degree adjusting value by superposing a first opening degree pre-adjusting value and a second opening degree pre-adjusting value so as to adjust the electronic expansion valve.
The embodiment is different from the defects of poor adaptability, limited regulating capacity and the like caused by single control only through the supercooling degree or the superheat degree in the prior art, adopts combined control based on the supercooling degree or the superheat degree and the room temperature, and corrects the valve step size of the electronic expansion valve of the air conditioner in the heating or refrigerating process through fuzzy control on the basis of supercooling degree/superheat degree control, so that the opening degree of the electronic expansion valve more suitable for the current state is obtained, the control precision of the electronic expansion valve is improved, the adaptability to different conditions is improved, and the heat exchange efficiency and the system stability of the air conditioner are effectively improved.
Further, the first opening pre-adjustment value Δ PP1Calculating by adopting a first fuzzy control model to obtain:
Figure BDA0002603207430000061
ΔPP1＝UV(t)；
wherein, UV (t) room temperature controls the opening of the output electronic expansion valve, UV (t-L) is the opening of the electronic expansion valve in the previous period, L is the control period, Y1(t) is the room temperature, Y1(t-L) is the indoor temperature of the previous cycle, R (t) is the indoor set temperature, ω is the control speed determining factor, ζ is the damping coefficient, B is the control threshold, YD1(t) is a rate of change of the indoor temperature of two adjacent control periods,
Figure BDA0002603207430000062
Figure BDA0002603207430000063
YDD1(t) is the rate of change of the two rates of change of the indoor temperature,
Figure BDA0002603207430000064
Figure BDA0002603207430000065
second opening degree preset value delta PP2And calculating by adopting a second fuzzy control model to obtain:
Figure BDA0002603207430000071
ΔPP2＝USC(t)；
wherein USC (t) is the opening degree of an electronic expansion valve controlled by superheat degree or supercooling degree, USC (t-L) is the opening degree of the electronic expansion valve in the previous period, L is the control period, Y is2(t) is the degree of superheat or supercooling, Y2(t-L) is the superheat or subcooling of the previous cycle, R (t) is the target superheat or subcooling, ω is the control speed determining factor, ζ is the damping coefficient, B is the control threshold, YD2(t) is the change rate of the degree of superheat or the change rate of the degree of supercooling in two adjacent control periods,
Figure BDA0002603207430000072
Figure BDA0002603207430000073
YDD2(t) is the rate of change of the two superheat rates or the rate of change of the two subcooling rates,
Figure BDA0002603207430000074
the embodiment respectively calculates a first opening pre-regulation value and a second opening pre-regulation value through the first fuzzy control model and the second fuzzy control model, can ensure that the calculated opening of the expansion valve is reasonable and meets the current environmental requirement, has higher real-time performance, and can timely react according to environmental changes.
Further, according to the first opening degree pre-adjustment value and the second opening degree pre-adjustment value, the first opening degree pre-adjustment value and the second opening degree pre-adjustment value are superposed by adopting a fuzzy control method to obtain an opening degree adjustment value of the electronic expansion valve, and the method specifically comprises the following steps:
determining membership functions based on the following control principles:
when the superheat degree or the supercooling degree is smaller than or equal to a third preset value or larger than or equal to a sixth preset value, controlling the opening degree of the electronic expansion valve by adopting a second controller;
when the degree of superheat or the degree of supercooling is larger than a third preset value and smaller than a fourth preset value or the degree of superheat or the degree of supercooling is larger than a fifth preset value and smaller than a sixth preset value, performing combined control on the opening degree of the electronic expansion valve by adopting a first controller and a second controller;
when the superheat degree or the supercooling degree is greater than or equal to a fourth preset value and less than or equal to a fifth preset value, controlling the opening degree of the electronic expansion valve by using a first controller;
and the third preset value is smaller than the fourth preset value, the fourth preset value is smaller than the fifth preset value, and the fifth preset value is smaller than the sixth preset value.
In the embodiment, when the superheat degree or the supercooling degree is too large or too small, the supercooling degree/superheat degree control is adopted, when the superheat degree or the supercooling degree is in a moderate range, the room temperature control is adopted, and the combination control of the superheat degree and the supercooling degree is adopted in other situations, so that the reliability of the system is ensured, the adaptability is higher, and the valve step requirements under various situations can be responded in time.
The membership functions include a first membership function f1(x) And a second membership function f2(x) And f is1(x)+f2(x)＝1。f1(x) Including one of triangular membership functions, trapezoidal membership functions and generalized bell membership functions according to f1(x)+f2(x) Yield f 12(x) In that respect Or f2(x) Comprises threeOne of an angular membership function, a trapezoidal membership function and a generalized bell membership function according to f1(x)+f2(x) Yield f 11(x)。
After determining the membership function, calculating an opening degree regulating value delta P of the electronic expansion valve according to the following formula;
ΔP＝f1(x)×ΔPP1+f2(x)×ΔPP2；
wherein, Δ PP1For a first opening pre-adjustment value, Δ PP2A second opening degree pre-adjustment value;
preferably, the membership function f1(x) Comprises the following steps:
Figure BDA0002603207430000081
wherein x is the degree of superheat or the degree of supercooling, and a, b, c and d are different set values.
Further, in order to guarantee that the electronic expansion valve opening adjustment value obtained through the above calculation can adapt to the current situation, heat exchange efficiency is better improved, user comfort is promoted, and this embodiment still includes after obtaining the opening adjustment value of electronic expansion valve: and correcting the opening degree adjusting value.
The correction rule is as follows:
when the supercooling degree is smaller than the supercooling degree set value, the corrected opening degree adjusting value is equal to the opening degree adjusting value minus a first correction value;
when the supercooling degree is greater than or equal to a first preset value, judging whether the temperature difference is greater than a set temperature difference value, wherein the temperature difference is the difference between the indoor temperature and the indoor set temperature;
when the temperature difference is larger than the temperature difference set value, the corrected opening degree adjusting value is equal to the opening degree adjusting value plus a second correction value;
and when the temperature difference is smaller than or equal to the temperature difference set value, the corrected opening degree adjusting value is equal to the opening degree adjusting value.
In experimental studies, it is found that when the supercooling degree is less than 5 ℃, the opening adjustment value calculated according to the present embodiment based on the opening degree of the current electronic expansion valve does not play a large role in adjustment, and can be improved by giving a correction value, so that when the supercooling degree setting value is set to 5 ℃, the first correction value is 12. Correspondingly, when the temperature difference is too large, the adjustment is also affected, and in the embodiment, the temperature difference set value is preferably 1 ℃, and the second correction value is preferably 5.
The present invention will be described in detail with reference to specific examples. Take the control of the electronic expansion valve of the multi-connected internal machine in the heating mode as an example.
As shown in fig. 2, after the initialization control of the electronic expansion valve is finished, the heating internal unit enters fuzzy control. The sensor detects the saturation temperature, the indoor unit inlet pipe temperature and the indoor temperature corresponding to the high-pressure according to the TDegree of supercooling＝TSaturation temperature corresponding to high pressure-TIndoor unit inlet pipe temperatureAnd calculating to obtain the supercooling degree, and acquiring the current indoor temperature, the indoor set temperature and the target supercooling degree.
Respectively calculating a first opening degree pre-regulation value and a second opening degree pre-regulation value through a control model of room temperature control and supercooling degree control,
in the control model that calculates the first opening pre-adjustment value,
Figure BDA0002603207430000091
the value of (a) is 2000, the value of ζ is 1, and the value of ω is 0.025.
In the control model that calculates the second opening pre-adjustment value,
Figure BDA0002603207430000092
the value of (a) is-500, the value of ζ is 1, the value of ω is 0.05, and the value of the target supercooling degree r (t) is 8.
After the first opening degree pre-adjustment value and the second opening degree pre-adjustment value are calculated, the opening degree adjustment value delta P is calculated by adopting a trapezoidal membership function according to the following control model.
ΔP＝f1(x)×ΔPP1+f2(x)×ΔPP2；
Wherein,
Figure BDA0002603207430000101
preferably, a is 6 ℃, b is 11 ℃, c is 25 ℃ and d is 30 ℃.
The specific calculation manner of calculating the opening degree adjustment value according to the range of the supercooling degree is shown in table 1.
Table 1:
Figure BDA0002603207430000102
after the opening degree regulating value delta P is obtained through calculation, the corrected opening degree regulating value delta P is obtained through calculation according to the correction rule*。
When the supercooling degree is less than 5 ℃, delta P*＝ΔP-12；
When the supercooling degree is more than or equal to 5 ℃ and the temperature difference is more than 1 ℃, delta P*＝ΔP+5；
When the supercooling degree is more than or equal to 5 ℃ and the temperature difference is less than or equal to 1 ℃, the opening degree regulating value is not required to be corrected, namely delta P*＝ΔP；
Finally, the electronic expansion valve is adjusted according to the corrected opening adjusting value, and the opening P of the electronic expansion valve is controlled as follows: p ═ PAt present+ΔP*。
An embodiment of the present invention further provides an electronic expansion valve control apparatus, including:
the acquisition unit is used for acquiring indoor temperature, indoor set temperature, supercooling degree or superheat degree, target supercooling degree or target superheat degree;
the control unit is used for acquiring a first opening pre-adjustment value by using a first fuzzy control model according to the indoor temperature, the change rate of the indoor temperature and the indoor set temperature, and acquiring a second opening pre-adjustment value by using a second fuzzy control model according to the superheat degree, the change rate of the superheat degree and the target superheat degree or according to the supercooling degree, the change rate of the supercooling degree and the target supercooling degree;
the control unit is also used for carrying out superposition control on the first opening degree pre-adjustment value and the second opening degree pre-adjustment value according to the range of the superheat degree or the supercooling degree to obtain the opening degree adjustment value of the electronic expansion valve.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and operated by a processor, the method for controlling the electronic expansion valve is realized.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A control method of an electronic expansion valve, comprising:
acquiring indoor temperature, indoor set temperature, supercooling degree or superheat degree, target supercooling degree or target superheat degree;
acquiring a first opening pre-adjustment value by using a first fuzzy control model according to the indoor temperature, the change rate of the indoor temperature and the indoor set temperature, and acquiring a second opening pre-adjustment value by using a second fuzzy control model according to the superheat degree, the change rate of the superheat degree and the target superheat degree or according to the supercooling degree, the change rate of the supercooling degree and the target supercooling degree; acquiring an opening degree adjusting value of the electronic expansion valve through the superposition control of the first opening degree pre-adjusting value and the second opening degree pre-adjusting value according to the superheat degree or the range of the supercooling degree, and adjusting the electronic expansion valve according to the opening degree adjusting value;
wherein the acquiring the opening degree adjustment value of the electronic expansion valve by the superposition control of the first opening degree pre-adjustment value and the second opening degree pre-adjustment value comprises:
superposing the first opening pre-adjustment value and the second opening pre-adjustment value according to the following formula to obtain the opening adjustment value delta P:
ΔP＝f1(x)×ΔPP1+f2(x)×ΔPP2；
wherein, Δ PP1For said first opening pre-adjustment value, Δ PP2Is said second opening degree preset value, f1(x) Is a first membership function, f2(x) Is a second membership function, and f1(x) And f2(x) The following relationship is satisfied:
f1(x)+f2(x)＝1。
2. the control method of an electronic expansion valve according to claim 1, wherein the first fuzzy control model is:
Figure FDA0003300696830000011
ΔPP1＝UV(t)；
wherein, Δ PP1For the first opening degree pre-adjustment value, UV (t) is the opening degree of the electronic expansion valve of the room temperature control output, UV (t-L) is the opening degree of the electronic expansion valve in the previous period, L is the control period, Y is the opening degree of the electronic expansion valve in the previous period1(t) is the room temperature, Y1(t-L) is the room temperature of the previous cycle,
Figure FDA0003300696830000021
r (t) is the indoor set temperature, omega is a control speed determining factor, zeta is a damping coefficient, and B is a control critical value;
the second fuzzy control model is as follows:
Figure FDA0003300696830000022
ΔPP2＝USC(t)；
wherein, Δ PP2For the second opening degree preset value, USC (t) is the opening degree of the electronic expansion valve output by superheat degree control or supercooling degree control, USC (t-L) is the opening degree of the electronic expansion valve in the previous period, L is the control period, Y is the opening degree of the electronic expansion valve in the previous period2(t) is the degree of superheat or theDegree of supercooling, Y2(t-L) is the degree of superheat or supercooling of the previous cycle,
Figure FDA0003300696830000023
Figure FDA0003300696830000024
r (t) is the target superheat degree or the target supercooling degree, omega is a control speed determining factor, zeta is a damping coefficient, and B is a control critical value.
3. The control method of an electronic expansion valve according to claim 1 or 2, wherein the first or second membership function comprises one of a triangular membership function, a trapezoidal membership function and a generalized bell membership function.
4. The control method of an electronic expansion valve according to claim 1 or 2, characterized in that the first membership function is:
Figure FDA0003300696830000025
wherein x is the superheat degree or the supercooling degree, and a, b, c and d are different set values.
5. The control method of the electronic expansion valve according to claim 4, wherein when x is the supercooling degree, a is 3-9 ℃, b is 8-14 ℃, c is 22-28 ℃ and d is 27-33 ℃.
6. The control method of an electronic expansion valve according to claim 1 or 2, further comprising, after obtaining the opening degree adjustment value of the electronic expansion valve:
and correcting the opening degree adjusting value according to the following correction rule:
when the supercooling degree is smaller than the supercooling degree set value, the corrected opening degree adjusting value is equal to the opening degree adjusting value minus a first correction value;
when the supercooling degree is greater than or equal to a first preset value, judging whether the temperature difference is greater than a temperature difference set value, wherein the temperature difference is the difference between the indoor temperature and the indoor set temperature;
when the temperature difference is larger than the temperature difference set value, the corrected opening degree adjusting value is equal to the opening degree adjusting value plus a second correction value;
and when the temperature difference is smaller than or equal to the temperature difference set value, the corrected opening degree adjusting value is equal to the opening degree adjusting value.
7. The control method of the electronic expansion valve according to claim 6, wherein the supercooling degree set value is 5 ℃, the first correction value is 12, the temperature difference set value is 1 ℃, and the second correction value is 5.
8. A control device for an electronic expansion valve, comprising:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring indoor temperature, indoor set temperature, supercooling degree or superheat degree, target supercooling degree or target superheat degree;
the control unit is used for acquiring a first preset opening value by using a first fuzzy control model according to the indoor temperature, the change rate of the indoor temperature and the indoor set temperature, and acquiring a second preset opening value by using a second fuzzy control model according to the superheat degree, the change rate of the superheat degree and the target superheat degree or according to the supercooling degree, the change rate of the supercooling degree and the target supercooling degree;
the control unit is also used for carrying out superposition control on the first opening degree pre-regulation value and the second opening degree pre-regulation value according to the range of the superheat degree or the supercooling degree to obtain an opening degree regulation value of the electronic expansion valve;
the overlapping control of the first opening degree pre-adjustment value and the second opening degree pre-adjustment value to obtain the opening degree adjustment value of the electronic expansion valve includes:
superposing the first opening pre-adjustment value and the second opening pre-adjustment value according to the following formula to obtain the opening adjustment value delta P:
ΔP＝f1(x)×ΔPP1+f2(x)×ΔPP2；
wherein, Δ PP1For said first opening pre-adjustment value, Δ PP2Is said second opening degree preset value, f1(x) Is a first membership function, f2(x) Is a second membership function, and f1(x) And f2(x) The following relationship is satisfied:
f1(x)+f2(x)＝1。
9. an air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement a control method of an electronic expansion valve according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements a control method of an electronic expansion valve according to any one of claims 1 to 7.
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