CN113639409B - Method and device for adjusting and controlling opening of electronic expansion valve of air conditioning system and medium - Google Patents

Method and device for adjusting and controlling opening of electronic expansion valve of air conditioning system and medium Download PDF

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Publication number
CN113639409B
CN113639409B CN202110761743.0A CN202110761743A CN113639409B CN 113639409 B CN113639409 B CN 113639409B CN 202110761743 A CN202110761743 A CN 202110761743A CN 113639409 B CN113639409 B CN 113639409B
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China
Prior art keywords
opening degree
expansion valve
electronic expansion
opening
conditioning system
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CN113639409A (en
Inventor
王年朋
谢吉培
张捷
王铁伟
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202110761743.0A priority Critical patent/CN113639409B/en
Publication of CN113639409A publication Critical patent/CN113639409A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F24F11/56—Remote control
    • 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
    • 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 relates to the technical field of air conditioners, and particularly provides a method and a device for adjusting and controlling the opening of an electronic expansion valve of an air conditioning system and a computer readable storage medium, wherein the control method comprises the following steps: after the air-conditioning system exits the defrosting mode until the suction pressure of the air-conditioning system is less than or equal to the set suction pressure, increasing the compensation opening degree for the electronic expansion valve, and performing PID (proportion integration differentiation) regulation of a first stage based on the compensation opening degree; assigning the opening degree of the electronic expansion valve to be a second opening degree K2 under the condition that the PID regulation of the first stage is finished, and carrying out the PID regulation of the second stage based on the second opening degree K2; the second opening K2 is greater than a reference opening K0 of the electronic expansion valve before entering the defrost mode. With such an arrangement, the electronic expansion valve can be more smoothly brought to the target opening degree at which the air conditioning system can be stably operated.

Description

Method and device for adjusting and controlling opening of electronic expansion valve of air conditioning system and medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to an electronic expansion valve opening adjusting and controlling method, a computer readable storage medium and a control device of an air conditioning system.
Background
Since the outdoor heat exchanger absorbs heat of the outdoor environment to dissipate heat of the indoor space, the capacity of the outdoor heat exchanger to absorb heat from the surrounding environment will be reduced after a frost layer is formed on the surface of the outdoor heat exchanger, and thus the outdoor heat exchanger needs to be defrosted in time when the outdoor heat exchanger is frosted. At present, the common defrosting modes for the outdoor heat exchanger mainly comprise reverse cycle defrosting and bypass defrosting. Among them, the reverse cycle defrost has a high defrost efficiency but during the reverse cycle defrost, the air conditioning system will operate in a cooling mode and thus completely sacrifice the user experience of the indoor space. The air conditioning system during bypass defrost still operates in a heating mode and thus takes care of the user experience of the indoor space to some extent, although the defrosting efficiency of bypass defrost is relatively low.
Taking the reverse cycle defrost as an example, the defrost mode corresponding to the reverse cycle defrost needs to be exited after the defrost operation is completed. After exiting the defrost mode, assume that the opening degree of the electronic expansion valve is assigned to the opening degree before defrosting. At this time, since the switching of the four-way valve is just completed and a stable refrigerant circulation system is not established, such direct assignment easily causes a problem of too low suction pressure of the compressor, and it can be understood that the compressor may be damaged when the suction pressure exceeds the operation range of the compressor.
In order to ensure the safe operation of the compressor, the currently adopted treatment mode is as follows: the compensating valve opening is then adjusted rapidly. Specifically, after the air conditioning system exits the defrost mode, the opening degree of the electronic expansion valve is assigned to the opening degree before defrosting, and then the air conditioning system performs conventional opening degree control of the electronic expansion valve. And in a certain time when the air conditioning system exits the defrosting mode, when the air conditioning system has the condition that the suction pressure of the compressor is less than the set suction pressure low value, increasing an opening compensation value for the electronic expansion valve, and then, continuing the opening control of the conventional electronic expansion valve by the air conditioning system. Thus, the compressor can be effectively prevented from being damaged. However, such a processing method has problems as follows: after the air conditioning system exits the defrosting mode for a period of time, a stable refrigerant circulation system is established, and the setting of the opening compensation value is accompanied by the phenomenon that the opening of the electronic expansion valve is too large. In this case, in order to meet the opening degree of the electronic expansion valve corresponding to a stable refrigerant circulation system, the amount of the opening degree of the electronic expansion valve to be adjusted is increased. At this time, if the adjustment speed of the electronic expansion valve is too fast (for example, in the case that the adjustment speed of the electronic expansion valve is overshot), the refrigerant circulation system may have a problem of a steep capacity drop. If the adjusting speed of the electronic expansion valve is too slow, the phenomenon that the compressor sucks air and carries liquid can be caused, and liquid impact on the compressor is caused.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to at least partially or to some extent solve the technical problems in the prior art, the invention provides an electronic expansion valve opening adjustment control method for an air conditioning system, which comprises the following steps: after the air-conditioning system exits the defrosting mode until the suction pressure of the air-conditioning system is less than or equal to the set suction pressure, increasing the compensation opening degree for the electronic expansion valve, and performing PID (proportion integration differentiation) regulation of a first stage based on the compensation opening degree; assigning the opening degree of the electronic expansion valve to be a second opening degree K2 under the condition that the PID regulation of the first stage is finished, and carrying out the PID regulation of the second stage based on the second opening degree K2; the second opening K2 is greater than a reference opening K0 of the electronic expansion valve before entering the defrost mode.
With such an arrangement, the electronic expansion valve can be more smoothly brought to the target opening degree at which the air conditioning system can be stably operated.
Specifically, in the case that the adjustment mechanism based on the opening compensation degree is performed to a certain extent, through the intervention of the reassignment, the adjustment mechanism based on the reassignment obtains a smooth adjustment mechanism, so that after the air conditioning system recovers the cooling and heating capacity thereof through defrosting, the opening degree capable of stably operating the air conditioning system can be reached through the PID adjustment based on the first stage of the opening compensation degree and the PID adjustment based on the second stage of the opening compensation degree.
It is understood that the value of the second opening K2 should be closer to the target opening than the opening when the PID adjustment of the first stage is completed.
With regard to the above-mentioned electronic expansion valve opening degree adjustment control method, in one possible embodiment, the second opening degree K2 is determined by: acquiring a first opening K1 of the electronic expansion valve when the PID regulation of the first stage is finished; and determining the second opening K2 according to the first opening K1.
With this arrangement, the manner of determining the second opening degree is given.
Specifically, the second opening degree is determined based on the first opening degree of the electronic expansion valve at the end of the PID adjustment in the first stage.
It is understood that a person skilled in the art may determine the specific manner of determining the second opening degree according to the first opening degree according to actual conditions, such as increasing the second opening degree by an amount or proportionally by a certain opening degree on the basis of the first opening degree.
With regard to the above-mentioned electronic expansion valve opening degree adjustment control method, in one possible embodiment, the "determining the second opening degree K2 according to the first opening degree K1" includes: and determining the second opening K2 according to the first opening K1 and the reference opening K0.
With this arrangement, a specific way of determining the second opening degree is given. Specifically, the set opening degree is determined by introducing the reference opening degree on the basis of the first opening degree.
Similar to the foregoing manner of determining the second opening degree according to the first opening degree, it can be understood that a person skilled in the art can determine a specific manner of determining the second opening degree according to the first opening degree and the reference opening degree according to actual conditions, such as taking the sum of the first opening degree and the reference opening degree as the second opening degree, and the like.
With regard to the above-described electronic expansion valve opening degree adjustment control method, in one possible embodiment, the "determining the second opening degree K2 based on the first opening degree K1 and the reference opening degree K0" includes:
K2＝a*(K1-K0)+K0 (1)
in the formula (1), a is an interpolation coefficient.
With this arrangement, a specific manner of determining the second opening degree from the reference/first opening degree is given.
With regard to the above-described electronic expansion valve opening degree adjustment control method, in one possible embodiment, after the step of "assigning the opening degree of the electronic expansion valve to a second opening degree K2 in a case where the PID adjustment in the first stage is completed, and performing the PID adjustment in the second stage based on the second opening degree", the control method includes: detecting the suction superheat Ps _ T and the exhaust superheat Pd _ T of the air conditioning system; and determining whether the opening degree of the electronic expansion valve needs to be reassigned when the PID regulation of the second stage is finished or not according to the suction superheat degree Ps _ T and the exhaust superheat degree Pd _ T, and carrying out the PID regulation based on the reassignment.
With such an arrangement, it is possible to smoothly reach a target opening at which the air conditioning system can be stably operated by intervention of a plurality of assignments and PID adjustment based on each assignment intervention.
It is understood that a person skilled in the art can determine the specific manner of determining whether to perform the reassignment according to the suction superheat Ps _ T and the discharge superheat Pd _ T according to actual conditions. Such as may be: and determining whether to reassign according to the difference between the suction superheat degree Ps _ T and the exhaust superheat degree Pd _ T and the corresponding target suction superheat degree Ps _ D and target exhaust superheat degree Pd _ D.
With the above electronic expansion valve opening adjustment control method, in one possible embodiment, the duration of the first stage is determined according to the following: carrying out PID adjustment based on the compensation opening degree, and adjusting the time length until the opening degree of the electronic expansion valve reaches a preset intermediate opening degree through the PID adjustment; the intermediate opening degree is larger than the reference opening degree and smaller than the opening degree of the electronic expansion valve of the air conditioning system in the non-frosted state.
With this arrangement, a particular way of determining the duration of the first stage is given.
With regard to the above-mentioned electronic expansion valve opening adjustment control method, in one possible implementation, the duration of the first stage is a preset duration.
With this arrangement, another specific way of determining the duration of the first phase is given.
It will be appreciated that the specific value of the set length of time can be determined by one skilled in the art through experimentation, analysis, and the like.
A second aspect of the present invention provides a computer readable storage medium adapted to store a plurality of program codes, the program codes being adapted to be loaded and executed by a processor to perform the method for controlling the opening adjustment of an electronic expansion valve of an air conditioning system according to any of the preceding claims.
It is understood that the computer readable storage medium has all the technical effects of the method for controlling the opening adjustment of the electronic expansion valve of the air conditioning system described in any one of the foregoing embodiments, and the details are not repeated herein.
It can be understood by those skilled in the art that all or part of the processes of the method for controlling the opening of the electronic expansion valve of the air conditioning system according to the present invention can be implemented by a computer program, which can be stored in a computer-readable storage medium and can implement the steps of the above-mentioned method embodiments when the computer program is executed by a processor. Wherein the computer program comprises computer program code, it is understood that the program code comprises but is not limited to program code for executing the above-mentioned method for controlling the opening adjustment of the electronic expansion valve of the air conditioning system. For convenience of explanation, only portions relevant to the present invention are shown. The computer program code may be in source code form, object code form, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying said computer program code, media, usb disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunication signals, software distribution media, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
A third aspect of the present invention provides a control device comprising a memory and a processor, the memory being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the method for controlling the opening adjustment of an electronic expansion valve of an air conditioning system according to any of the preceding claims.
It can be understood that the control device has all the technical effects of the method for controlling the opening adjustment of the electronic expansion valve of the air conditioning system, which are not described herein again. The control device may be a control device apparatus formed including various electronic apparatuses.
A fourth aspect of the invention provides a control apparatus that includes a control module configured to execute the electronic expansion valve opening adjustment control method of an air conditioning system of any one of the foregoing.
It can be understood that the control device has all the technical effects of the method for controlling the opening adjustment of the electronic expansion valve of the air conditioning system, which are not described herein again.
In the description of the present invention, a "control module" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer-readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and so forth.
Further, it should be understood that, since the setting of the control module is only for explaining the functional units in the system corresponding to the electronic expansion valve opening degree adjustment control method of the air conditioning system of the present invention, the physical device corresponding to the control module may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of control modules is only exemplary. Those skilled in the art will appreciate that the control module may be adaptively split according to the actual situation. The specific splitting of the control module does not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solution after splitting will fall into the protection scope of the present invention.
Drawings
The following describes an opening adjustment control method of an electronic expansion valve of an air conditioning system according to the present invention with reference to the accompanying drawings and with reference to the first stage, where the duration of the first stage is the operating time to reach the preset refrigerant system setup time T1. In the drawings:
fig. 1 is a flowchart illustrating an electronic expansion valve opening degree adjustment control method of an air conditioning system according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. The skilled person can adjust the corresponding parameters according to the actual situation without departing from the principles of the present invention, for example, although in the present embodiment, the duration of the first stage is the operating time reaching the preset refrigerant system establishing time T1, the skilled person can adjust the corresponding parameters according to the actual situation, for example, similar to T2, the duration preset according to other elements, or the duration when the opening degree of the electronic expansion valve reaches a certain preset intermediate opening degree, etc.
It should be noted that in the description of the present invention, the term "a and/or B" indicates all possible combinations of a and B, such as a alone, B alone, or a and B. The term "at least one A or B" or "at least one of A and B" means similar to "A and/or B" and may include only A, only B, or both A and B. The singular forms "a", "an" and "the" may include the plural forms as well. 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.
Furthermore, while numerous specific details are set forth in the following description in order to provide a better understanding of the invention, it will be apparent to those skilled in the art that the invention may be practiced without some of these specific details. In some instances, cooktop principles and the like, well known to those skilled in the art, have not been described in detail in order to highlight the subject matter of the present invention.
The structure of the air conditioning system related to the refrigerant mainly comprises a compressor forming a main refrigerant loop, an indoor heat exchanger, an outdoor heat exchanger, a throttling component (such as a capillary tube, an electronic expansion valve and the like) and a four-way valve, wherein the air conditioning system can have a conventional refrigeration mode and a heating mode by switching the communication mode of the four-way valve, and cold/heat can be distributed to the surface of the indoor heat exchanger along with the phase change of the refrigerant through the circulating flow of the refrigerant in the loop formed by the compressor, the condenser, the throttling component, the evaporator and the compressor. Specifically, the method comprises the following steps: when the refrigerant circulates along the circuit of the compressor → the indoor heat exchanger → the outdoor heat exchanger → the compressor, the air conditioning system is in a heating cycle. Namely: under the condition that the air conditioning system is in a heating mode, the indoor heat exchanger is used as a condenser for distributing heat; when the refrigerant circulates along the circuit of the compressor → the outdoor heat exchanger → the indoor heat exchanger → the compressor, the air conditioning system is in a refrigeration cycle. Namely: in the case of an air conditioning system in a cooling mode, the indoor heat exchanger acts as an evaporator for distributing cooling energy.
An air conditioning system generally includes an outdoor unit and an indoor unit, and for most models, the outdoor unit and the indoor unit are of a split structure, in which the outdoor unit is called an outdoor unit of an air conditioner and the indoor unit is called an indoor unit of the air conditioner, and the outdoor unit and the indoor unit are connected by a pipeline. The indoor heat exchanger and related components such as an indoor fan and an electrical box are arranged in the air-conditioning outdoor unit, and the compressor, the outdoor heat exchanger and related components such as an outdoor fan are arranged in the air-conditioning outdoor unit. In the case where the air conditioning system operates in the heating mode, there may be a frosting phenomenon in the outdoor heat exchanger. Specifically, when the air conditioning system is operated in the heating mode in a situation where the outdoor ambient temperature is low, such as in winter, after condensation is formed on the surface of the outdoor heat exchanger, the condensation freezes to form a frost layer since the outdoor ambient temperature continues to be low. Because the outdoor heat exchanger absorbs heat of the outdoor environment to realize heat dissipation of the indoor space, the capacity of the outdoor heat exchanger to absorb heat from the ambient environment after a frost layer is formed on the surface of the outdoor heat exchanger will be reduced, and at this time, the opening degree of the electronic expansion valve is reduced based on the PID adjustment of the air conditioning system. In case the frost layer reaches a certain level, it is necessary to initiate (reverse cycle) a defrost mode to remove the frost layer.
If the air conditioning system is operated in a steady state without frosting, the opening degree of the corresponding electronic expansion valve is a target opening degree (referred to as a peak value) when the air conditioning system is operated in a certain setting scene (the parameters of the outdoor environment, the parameters of the indoor environment, the heating demand of the user, and the like are consistent), and the opening degree of the corresponding electronic expansion valve is a reference opening degree (referred to as a valley value) before the air conditioning system enters the defrosting mode. The invention aims to make the opening degree of the electronic expansion valve of the air-conditioning system return to the target opening degree as smoothly as possible after the air-conditioning system enters a defrosting mode by interpolating between the peak value and the valley value to be used as the opening degree value of the electronic expansion valve at the moment.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating an electronic expansion valve opening degree adjustment control method of an air conditioning system according to an embodiment of the present invention. As shown in fig. 1, the control method mainly includes the following steps:
s101, after the air conditioning system exits from a reverse cycle defrosting mode, assigning the opening of the electronic expansion valve as a reference opening K0 during stable operation before defrosting;
in one possible embodiment, after the air conditioning system exits the defrosting mode, the air conditioning system is adjusted in the following adjusting mode until the air suction pressure of the air conditioning system is less than or equal to the set air suction pressure:
and assigning the electronic expansion valve to a reference opening K0 before entering the defrosting mode, and performing PID (proportion integration differentiation) adjustment based on the reference opening K0. At this time, since the refrigerant circulation system is not established immediately, the suction pressure is not too low to exceed the allowable operation range of the compressor.
S103, detecting the suction pressure value Ps of the air conditioning system in real time, increasing a compensation opening K for the opening of the electronic expansion valve when the suction pressure value Ps of the air conditioning system is smaller than a set suction pressure value Ps _ T, and then performing classical PID (proportion integration differentiation) regulation in the first stage until the operation time reaches a preset refrigerant system establishment time T1.
And S105, when the running time reaches the preset refrigerant system establishing time T1, recording the opening degree of the electronic expansion valve at the moment, recording the opening degree as a first opening degree K1, calculating a second opening degree K2 according to K1 and K2= a (K1-K0) + K0, assigning the opening degree of the electronic expansion valve as K2, and then performing classical PID (proportion integration differentiation) regulation at the second stage. Namely: k1 is covered by K2, and then the classical PID regulation of the second stage is entered until the running time reaches a preset period T2.
S107, when the running time reaches a preset period T2, detecting the suction superheat degree Ps _ T and the exhaust superheat degree Pd _ T of a compressor of the air conditioning system, comparing the suction superheat degree Ps _ T and the exhaust superheat degree Pd _ T with corresponding target suction superheat degree Ps _ D and target exhaust superheat degree Pd _ D, and if the conditions that 'A is not less than Ps _ T-Ps _ D is not less than B and C is not less than Pd _ T-Pd _ D is not less than D' are met, performing further opening assignment by referring to S105, specifically, enabling K2= K3 and K3= (a (K2-K)) + K; otherwise, the classical PID regulation is continued until the opening degree of the electronic expansion valve of the air-conditioning system reaches the target opening degree, and the interpolation between the peak and the valley-the classical PID regulation is exited, so that the air-conditioning system can be in a stable operation state.
It can be seen that in the method for adjusting and controlling the opening of the electronic expansion valve, after the air-conditioning system exits the defrosting mode, the electronic expansion valve can more stably reach the target opening which enables the air-conditioning system to stably operate by multiple assignments and combination of classical PID adjustment, thereby effectively avoiding the problems of system oscillation or compressor liquid impact and the like.
It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art may understand that, in order to achieve the effect of the present invention, different steps do not have to be executed in such a sequence, and may be executed simultaneously or in other sequences, and some steps may be added, replaced or omitted, and these changes are within the protection scope of the present invention. Such as may be: the first difference value and the second difference value adopt different formulas and the like.
It should be noted that, although the control method configured in the above-described specific manner is described as an example, those skilled in the art will appreciate that the present invention should not be limited thereto. In fact, the user can flexibly adjust the relevant steps and the elements such as parameters in the steps according to the situation such as the actual application scene, etc., such as: the preset refrigerant system setup time T1 and the preset period T2 may be determined according to other parameters instead of directly preset values and the like.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (7)

1. An opening degree adjusting control method of an electronic expansion valve of an air conditioning system is characterized by comprising the following steps:
after the air-conditioning system exits the defrosting mode, assigning the opening degree of the electronic expansion valve as a reference opening degree K0 during stable operation before defrosting, increasing a compensation opening degree for the electronic expansion valve under the condition that the suction pressure of the air-conditioning system is less than or equal to a set suction pressure, and performing PID (proportion integration differentiation) regulation of a first stage on the basis of the compensation opening degree;
assigning the opening degree of the electronic expansion valve to be a second opening degree K2 under the condition that the PID regulation of the first stage is finished, and carrying out the PID regulation of the second stage based on the second opening degree K2;
wherein the duration of the first stage is determined according to the following:
carrying out PID adjustment based on the compensation opening degree, and adjusting the time length until the opening degree of the electronic expansion valve reaches a preset intermediate opening degree through the PID adjustment;
the intermediate opening degree is larger than the reference opening degree and smaller than the opening degree of the electronic expansion valve of the air conditioning system in a non-frosted state;
the second opening K2 is larger than a reference opening K0 of the electronic expansion valve before entering the defrosting mode;
the second opening K2 is determined in the following manner:
acquiring a first opening K1 of the electronic expansion valve when the PID regulation of the first stage is finished;
determining the second opening K2 according to the first opening K1;
wherein the determining the second opening K2 according to the first opening K1 includes:
and determining the second opening K2 according to the first opening K1 and the reference opening K0.
2. The electronic expansion valve opening degree adjustment control method according to claim 1, wherein the "determining the second opening degree K2 based on the first opening degree K1 and the reference opening degree K0" includes:
K2=a*（K1-K0）+K0 （1）
in the formula (1), a is an interpolation coefficient.
3. The electronic expansion valve opening degree adjustment control method according to claim 1, wherein, after the step of "assigning the opening degree of the electronic expansion valve to a second opening degree K2 in a case where the PID adjustment in the first stage is completed, and performing the PID adjustment in the second stage based on the second opening degree", the control method comprises:
detecting the suction superheat Ps _ T and the exhaust superheat Pd _ T of the air conditioning system;
and determining whether the opening degree of the electronic expansion valve needs to be reassigned when the PID regulation of the second stage is finished according to the suction superheat degree Ps _ T and the exhaust superheat degree Pd _ T, and carrying out PID regulation based on reassignment.
4. The electronic expansion valve opening adjustment control method according to claim 1, characterized in that the duration of the first stage is a preset duration.
5. A computer readable storage medium adapted to store a plurality of program codes adapted to be loaded and executed by a processor to perform the electronic expansion valve opening degree adjustment control method of an air conditioning system according to any one of claims 1 to 4.
6. A control device characterized in that it comprises a memory and a processor, said memory being adapted to store a plurality of program codes adapted to be loaded and run by said processor to perform the method of controlling the opening adjustment of an electronic expansion valve of an air conditioning system according to any one of claims 1 to 4.
7. A control device characterized by comprising a control module configured to execute the electronic expansion valve opening degree adjustment control method of an air conditioning system according to any one of claims 1 to 4.
CN202110761743.0A 2021-07-06 2021-07-06 Method and device for adjusting and controlling opening of electronic expansion valve of air conditioning system and medium Active CN113639409B (en)

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