CN114383268A - Method and device for controlling electronic expansion valve, air conditioner and storage medium - Google Patents

Method and device for controlling electronic expansion valve, air conditioner and storage medium Download PDF

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Publication number
CN114383268A
CN114383268A CN202111609582.XA CN202111609582A CN114383268A CN 114383268 A CN114383268 A CN 114383268A CN 202111609582 A CN202111609582 A CN 202111609582A CN 114383268 A CN114383268 A CN 114383268A
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CN
China
Prior art keywords
expansion valve
electronic expansion
opening degree
air conditioner
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111609582.XA
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Chinese (zh)
Inventor
石贤光
矫立涛
邱洪刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Air Conditioner Gen Corp Ltd, Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioner Gen Corp Ltd
Priority to CN202111609582.XA priority Critical patent/CN114383268A/en
Publication of CN114383268A publication Critical patent/CN114383268A/en
Priority to PCT/CN2022/105443 priority patent/WO2023124011A1/en
Pending legal-status Critical Current

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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
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—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
    • F24F11/70—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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/01—Timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/027—Compressor control by controlling pressure
    • F25B2600/0271—Compressor control by controlling pressure the discharge pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • 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 application relates to the technical field of intelligent household appliances, and discloses a method for controlling an electronic expansion valve, which comprises the following steps: detecting the operation time after defrosting is finished under the condition that the air conditioner operates in a heating mode; determining a target discharge temperature of the compressor according to the operation time under the condition that the operation time is greater than a first set time; and adjusting the opening degree of the electronic expansion valve according to the target exhaust temperature. When the air conditioner operates in a heating mode, the operation time after defrosting is finished is detected. And under the condition that the operation time is greater than the first set time, the air conditioner enters a heating stable stage. For different operation time, the frosting degree of the outdoor unit of the air conditioner is different, and the required exhaust temperature of the compressor is different. And determining the target exhaust temperature of the compressor according to the running time, adjusting the opening of the electronic expansion valve according to the target exhaust temperature, and improving the heating capacity of the air conditioner during the constant-frequency running of the compressor. The application also discloses a device for controlling the electronic expansion valve, an air conditioner and a storage medium.

Description

Method and device for controlling electronic expansion valve, air conditioner and storage medium
Technical Field
The present invention relates to the field of intelligent household electrical appliance technologies, and for example, to a method and an apparatus for controlling an electronic expansion valve, an air conditioner, and a storage medium.
Background
Currently, in cold environments, air conditioners are operated in a heating mode to keep rooms warm. The opening of the electronic expansion valve is adjusted to change the circulation of the refrigerant, and the heating capacity of the air conditioner is improved.
The method for controlling the electronic expansion valve of the air conditioner in the prior art comprises the following steps: after the compressor is started to operate, acquiring the actual operating frequency of the compressor, and comparing the actual operating frequency with the set operating frequency; if the actual operating frequency is less than the set operating frequency, controlling the opening degree of the electronic expansion valve to be an initial opening degree; otherwise, executing the control process of the regulating valve in the initial operation stage; after the running time of the starting operation of the compressor reaches the set initial running time, executing a control process of a PID (Proportional Integral Differential) regulating valve; the control process of the PID regulating valve is a process of performing PID control on the opening degree of the electronic expansion valve based on deviation by taking the difference value between the actual exhaust temperature of the compressor and the target exhaust temperature as the deviation; the target exhaust temperature is determined according to the actual operating frequency; wherein the target exhaust temperature is linearly related to the actual operating frequency.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
when the outdoor ambient temperature is low, the compressor is often operated at a fixed frequency during heating by the air conditioner, and the target discharge temperature is not changed. After the outdoor unit of the air conditioner begins to frost, the actual discharge temperature of the compressor decreases. In order to reach the target exhaust temperature, the opening degree of the electronic expansion valve is gradually reduced, so that the refrigerant flow rate is continuously reduced, and the heating capacity of the indoor unit of the air conditioner is reduced.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a method and a device for controlling an electronic expansion valve, an air conditioner and a storage medium, so as to improve the heating capacity of the air conditioner when a compressor operates at a fixed frequency.
In some embodiments, the method comprises: detecting the operation time after defrosting is finished under the condition that the air conditioner operates in a heating mode; determining a target discharge temperature of the compressor according to the operation time under the condition that the operation time is greater than a first set time; and adjusting the opening degree of the electronic expansion valve according to the target exhaust temperature.
Optionally, determining a target discharge temperature of the compressor based on the run time comprises: determining a frosting stage corresponding to the running time according to the running time; and determining the target exhaust temperature of the compressor corresponding to the frosting stage according to the frosting stage.
Optionally, adjusting the opening degree of the electronic expansion valve according to the target exhaust gas temperature includes: determining the target opening degree of the electronic expansion valve through PID operation according to the target exhaust temperature; the opening degree of the electronic expansion valve is adjusted to a target opening degree.
Alternatively, determining the target opening degree of the electronic expansion valve through PID calculation according to the target exhaust temperature includes: detecting the current exhaust temperature of the compressor; determining a difference between the current exhaust temperature and a target exhaust temperature; and determining the target opening degree of the electronic expansion valve by using the difference value of the exhaust temperatures as deviation through PID calculation.
Optionally, after detecting the operation time after the defrosting is completed, the method further includes: under the condition that the running time is less than or equal to a first set time and is greater than a second set time, the opening degree of the electronic expansion valve is adjusted to a first preset opening degree; under the condition that the running time is less than or equal to a second set time, the opening degree of the electronic expansion valve is adjusted to a second preset opening degree; the first preset opening degree is larger than the second preset opening degree.
Optionally, the method further comprises: and under the condition that the air conditioner operates in the defrosting mode, adjusting the opening degree of the electronic expansion valve to a third preset opening degree.
Optionally, before adjusting the opening degree of the electronic expansion valve to the third preset opening degree, the method further includes: detecting the outdoor environment temperature; determining the frost point temperature according to the outdoor environment temperature; detecting the temperature of the outer coil for multiple times within a third set time; and controlling the air conditioner to operate in a defrosting mode under the condition that the temperature of the outer coil pipe is less than the frost point temperature.
In some embodiments, the apparatus comprises a processor and a memory storing program instructions, the processor being configured, upon execution of the program instructions, to perform the above-described method for controlling an electronic expansion valve.
In some embodiments, the air conditioner includes the above-described apparatus for controlling an electronic expansion valve.
In some embodiments, the storage medium stores program instructions that, when executed, perform the above-described method for controlling an electronic expansion valve.
The method and the device for controlling the electronic expansion valve, the air conditioner and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:
when the air conditioner operates in the heating mode, the time of operating in the heating mode after defrosting is finished is detected. In case that the operation time is greater than the first set time, the air conditioner has entered a stable stage of heating, not a start-up stage of heating. For different operation time, the frosting degree of the air conditioner outdoor unit is different, and the required discharge temperature of the compressor is different. And determining the target exhaust temperature of the compressor according to the running time, and adjusting the opening of the electronic expansion valve according to the target exhaust temperature so as to improve the heating capacity of the air conditioner when the compressor runs at the fixed frequency.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of electrical connections of an air conditioner according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a method for controlling an electronic expansion valve according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a process for controlling an electronic expansion valve according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another method for controlling an electronic expansion valve provided by an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of another method for controlling an electronic expansion valve provided by an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of another method for controlling an electronic expansion valve provided by an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of another method for controlling an electronic expansion valve provided by an embodiment of the present disclosure;
fig. 9 is a schematic diagram of an apparatus for controlling an electronic expansion valve according to an embodiment of the present disclosure.
Reference numerals:
1: an air conditioner; 11: a compressor; 12: a four-way valve; 13: an outdoor heat exchanger; 14: an electronic expansion valve; 15: an indoor heat exchanger; 16: an inner coil pipe; 17: an outer coil pipe; 18: a first temperature sensor; 19: a second temperature sensor; 20: a third temperature sensor; 21: a fourth temperature sensor: 41: a processor; 42: a memory; 43: a communication interface; 44: a bus.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
The term "correspond" may refer to an association or binding relationship, and a corresponds to B refers to an association or binding relationship between a and B.
Referring to fig. 1 and 2, an embodiment of the present disclosure provides an air conditioner 1 including a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, an electronic expansion valve 14, an indoor heat exchanger 15, an inner coil 16, and an outer coil 17. The compressor 11, the four-way valve 12, the outdoor heat exchanger 13, the electronic expansion valve 14 and the indoor heat exchanger 15 are connected in series in sequence to form a loop. The inner coil 16 is provided to the indoor heat exchanger 15. The outer coil 17 is provided to the outdoor heat exchanger 13.
Optionally, the air conditioner 1 further includes a first temperature sensor 18, a second temperature sensor 19, a third temperature sensor 20, a fourth temperature sensor 21, and a processor 41. The first temperature sensor 18 is disposed on the inner coil 16 for detecting the temperature of the inner coil 16. The second temperature sensor 19 is disposed on the outer coil 17 and is configured to detect a temperature of the outer coil 17. The third temperature sensor 20 is provided in the outdoor unit of the air conditioner 1, and detects the discharge temperature of the compressor 11. The fourth temperature sensor 21 is disposed in the outdoor unit of the air conditioner 1, and detects an outdoor ambient temperature. The processor 41 is electrically connected to the compressor 11, the four-way valve 12, the electronic expansion valve 14, the first temperature sensor 18, the second temperature sensor 19, the third temperature sensor 20, and the fourth temperature sensor 21, respectively, and configured to control the frequency of the compressor 11 and the on/off of the four-way valve 12 according to the temperatures detected by the second temperature sensor 19 and the fourth temperature sensor 21, and adjust the opening degree of the electronic expansion valve 14 according to the temperatures detected by the first temperature sensor 18, the second temperature sensor 19, the third temperature sensor 20, and the fourth temperature sensor 21. When the four-way valve 12 is powered on, the air conditioner 1 works in a heating mode, and the frequency of the control compressor 11 is kept unchanged. When the four-way valve 12 is powered off, the air conditioner 1 operates in a cooling mode for defrosting, and the frequency of the compressor 11 is controlled to change as the defrosting process progresses.
Referring to fig. 3, an embodiment of the present disclosure provides a method for controlling an electronic expansion valve, including:
s240, when the air conditioner operates in the heating mode, the processor detects an operation time after the defrosting is finished.
And S250, under the condition that the running time is greater than the first set time, determining the target exhaust temperature of the compressor by the processor according to the running time.
And S260, the processor adjusts the opening degree of the electronic expansion valve according to the target exhaust temperature.
By adopting the method for controlling the electronic expansion valve provided by the embodiment of the disclosure, when the air conditioner runs in the heating mode, the time of running in the heating mode after defrosting is finished is detected. In case that the operation time is greater than the first set time, the air conditioner has entered a stable stage of heating, not a start-up stage of heating. For different operation time, the frosting degree of the air conditioner outdoor unit is different, and the required discharge temperature of the compressor is different. And determining the target exhaust temperature of the compressor according to the running time, and adjusting the opening of the electronic expansion valve according to the target exhaust temperature so as to improve the heating capacity of the air conditioner when the compressor runs at the fixed frequency.
Referring to fig. 4, a method for controlling an electronic expansion valve according to an embodiment of the present disclosure takes a time when a last defrosting of an air conditioner is finished as a starting point (corresponding to a time 0), and a time when a current defrosting is started as an ending point (corresponding to a time T5), as one cycle of a heating mode operation (corresponding to a time period of 0 to T5). The time period T5-T6 is the time of defrost mode operation. At the end of each defrost, the operating time of the air conditioner is cleared, i.e., T6 corresponds to time 0 of the new heating phase.
The first set time t2 is the time elapsed during the heating mode activation phase. The first set time t2 is set to a value range of [1, 3] min, and preferably, the first set time t2 is set to a value of 1.5min, 2min or 2.5 min.
Referring to fig. 5, another method for controlling an electronic expansion valve is provided in an embodiment of the present disclosure, including:
s200, the processor establishes a corresponding relation between the frosting stage and the target exhaust temperature.
S240, when the air conditioner operates in the heating mode, the processor detects an operation time after the defrosting is finished.
And S251, under the condition that the running time is greater than the first set time, the processor determines a frosting stage corresponding to the running time according to the running time.
And S252, the processor determines the target exhaust temperature of the compressor corresponding to the frosting stage according to the frosting stage.
And S260, the processor adjusts the opening degree of the electronic expansion valve according to the target exhaust temperature.
By adopting the method for controlling the electronic expansion valve provided by the embodiment of the disclosure, the frosting stage is determined through the running time of the air conditioner. And determining the target exhaust temperature corresponding to the frosting stage in a table look-up mode, wherein the target exhaust temperature is not fixed any more and changes along with the frosting degree of the outdoor unit in the whole heating operation process. And adjusting the opening degree of the electronic expansion valve according to the changed target exhaust temperature so as to improve the heating capacity of the air conditioner when the compressor operates at the constant frequency.
The target exhaust temperature is influenced by the frosting degree of the outdoor unit of the air conditioner, and is related to the heating capacity of the indoor unit. Because the outdoor environment temperature changes of each area are inconsistent, the frosting speed of the outdoor unit of the air conditioner is different, and the target exhaust temperature required in the frosting process is different. The corresponding relation between the target exhaust temperature and the frosting stage can be determined by presetting a plurality of corresponding relations for a plurality of outdoor environment temperatures when leaving a factory, and can also be dynamically determined according to the actual operating environment of the air conditioner.
Referring to fig. 6, another method for controlling an electronic expansion valve is provided in an embodiment of the present disclosure, including:
s201, the processor searches the corresponding relation between each frosting stage and the target exhaust temperature.
S202, the processor judges whether each frosting stage has a corresponding target exhaust temperature. If yes, go to step S240. If not, go to step S203.
And S203, detecting the running time after defrosting is finished by the processor.
And S204, the processor determines a frosting stage corresponding to the running time according to the running time.
S205, the processor judges whether a corresponding target exhaust temperature exists in the frosting stage. If yes, the process returns to step S203. If not, go to step S206.
S206, the processor judges whether the running time reaches the set time of the frosting stage. If yes, go to step S207. If not, the process returns to step S203.
S207, the processor adjusts the target exhaust temperature of the compressor.
And S208, the processor adjusts the opening degree of the electronic expansion valve according to the target exhaust temperature.
S209, the first temperature sensor detects the temperature of the inner coil.
S210, the processor judges whether the temperature of the inner coil is the maximum value. If yes, the process returns to step S207. If not, go to step S211.
S211, the processor sets the target exhaust temperature of the previous time and the frosting stage to be in corresponding relation, and returns to the step S201.
S240, when the air conditioner operates in the heating mode, the processor detects an operation time after the defrosting is finished.
And S251, under the condition that the running time is greater than the first set time, the processor determines a frosting stage corresponding to the running time according to the running time.
And S252, the processor determines the target exhaust temperature of the compressor corresponding to the frosting stage according to the frosting stage.
In step S260, the processor adjusts the opening degree of the electronic expansion valve according to the target exhaust temperature, and returns to step S240.
By adopting the method for controlling the electronic expansion valve provided by the embodiment of the disclosure, the corresponding relation between the target exhaust temperature and the frosting stage can be established according to the actual operation environment of the air conditioner. Because the target exhaust temperature corresponds to the maximum value of the temperature of the coil pipe in the current frosting stage, the heating capacity of the air conditioner is strong when the opening degree of the electronic expansion valve is adjusted according to the target exhaust temperature, so that the heating capacity of the air conditioner is improved when the compressor operates at the fixed frequency.
Referring to fig. 4 and 6, a heating time (corresponding to a period of 0-T5) required for one cycle of operation in the heating mode is determined, and a difference between the heating time and a first set time T2 (corresponding to a period of T2-T5) is divided equally into a preset number of stages, each of which is a defrosting stage. The preset number of the segments can be 5 segments, 10 segments or other numbers of the segments. The more the number of the preset stages is, the higher the accuracy of the target exhaust temperature is, and the more complicated the establishment and search of the corresponding relationship is.
Specifically, the difference between the heating time and the first set time t2 is divided into 5 segments on average, and each segment is used as a frosting stage. T2-T1 are the first frosting stage, T1-T2 are the second frosting stage, and so on. When the time of operation falls within T2-T1, the frosting stage is the first frosting stage. When the time of operation falls within T1-T2, the frosting stage is the second frosting stage, and so on. And in each frosting stage, determining the target exhaust temperature of the current frosting stage according to the corresponding relation between the target exhaust temperature and the frosting stage. And adjusting the electronic expansion valve according to the current exhaust temperature.
The setting time may be the starting time of the frosting stage, the middle time of the frosting stage, or the ending time of the frosting stage. The selection of the setting time influences the size of the target exhaust temperature, and further influences the opening degree of the electronic expansion valve and the heating capacity of the air conditioner.
Alternatively, the processor in step S207 adjusts the target discharge temperature of the compressor by initially setting the target discharge temperature to a lower value, such as 25 ℃. The target exhaust temperature is then gradually increased, for example by 1 ℃ each time. Therefore, the target exhaust temperature which enables the indoor heating effect to be good in the current frosting stage can be found, and the heating capacity of the air conditioner during the constant-frequency operation of the compressor is improved.
Referring to fig. 7, another method for controlling an electronic expansion valve is provided in an embodiment of the present disclosure, including:
s240, when the air conditioner operates in the heating mode, the processor detects an operation time after the defrosting is finished.
And S250, under the condition that the running time is greater than the first set time, determining the target exhaust temperature of the compressor by the processor according to the running time.
S261, the third temperature sensor detects a current discharge temperature of the compressor.
S262, the processor determines the difference between the current exhaust temperature and the target exhaust temperature.
And S263, determining the target opening degree of the electronic expansion valve by PID calculation by using the difference value of the exhaust temperature as a deviation through the processor.
S264, the processor adjusts the opening degree of the electronic expansion valve to a target opening degree.
By adopting the method for controlling the electronic expansion valve provided by the embodiment of the disclosure, the difference value between the current exhaust temperature and the target exhaust temperature of the compressor is used as the deviation, and the target opening degree of the electronic expansion valve is determined through PID operation, so that the rapid and accurate adjustment of the opening degree of the electronic expansion valve is realized. The opening degree of the electronic expansion valve is accurately adjusted to enable the current exhaust temperature to be close to the target exhaust temperature, so that the heating capacity of the air conditioner during the constant-frequency operation of the compressor is improved.
Alternatively, the calculation formula of the target opening degree of the electronic expansion valve in step S263 is as follows: vs＝Vs1+△Fn. Wherein, VsIs a target opening degree of the electronic expansion valve, Vs1Is the current opening degree, DeltaF, of the electronic expansion valvenThe opening degree adjustment quantity of the electronic expansion valve.
Alternatively, the calculation formula of the opening degree adjustment amount of the electronic expansion valve is as follows: delta Fn＝INT(Kp×Dn/100)+INT(Ki×Pn/100+Iyd)+INT(Kd×(Dn-Dn1)/100). Wherein, KpIs a proportionality coefficient, PnDeviation of the current exhaust temperature from the target exhaust temperature, DnIs the difference between the current deviation and the previous deviation, KiAs an integral coefficient, IydAs a fraction of the integral term, KdIs a differential coefficient, Dn1INT is the rounding function, which is the difference between the previous deviation and the previous deviation, and the rounded value is a small integer value. I isydThe calculation formula of (a) is as follows: i isyd＝Iyd1+((Ki×Pn/100)-INT(Ki×Pn/100))/10. Wherein, Iyd1The fraction of the integral term of the previous time. KpHas a value range of [160, 240 ]]Preferably, KpValues of 180, 200 or 220. KiHas a value range of [9, 15 ]]Preferably, KiThe value is 10, 12 or 14. KdHas a value range of [90, 110 ]]Preferably, KdTaking a value of 95, 100 or 105.
Optionally, the proportional term of the PID operation is denoted as Py＝INT(Kp×Dn100), there are the following settings: if P isyIf < -8 > then Py-8. If P isyIf > 8, then Py＝8。
Optionally, proportional term P of PID operationyThe following settings were made: if | PnIf | is less than or equal to 4, then Py＝INT(Py×2/3)。
Optionally, the integral term of the PID operation is denoted as Iy＝INT(Ki×Pn/100+Iyd) There are the following settings: if P isyIf less than-35, then Py-35. If P isyIf > 35, then Py＝35。
Optionally, the integral term fractional part I of the PID operationydThe following settings were made: if IydIf greater than 0.65, then Iyd＝Iyd/4。
Optionally, the opening degree adjustment quantity Δ F of the electronic expansion valvenThe following settings were made: if Δ Fn< 8, then. DELTA.Fn-8. If Δ FnIf > 8, then Δ Fn＝8。
Optionally, the opening degree adjustment quantity Δ F of the electronic expansion valvenThe following settings were made: if | PnIf | is less than or equal to 2, then Iyd＝0，△Fn＝0。
Referring to fig. 8, another method for controlling an electronic expansion valve is provided in an embodiment of the present disclosure, including:
s221, the fourth temperature sensor detects an outdoor ambient temperature.
S222, the processor determines the frost point temperature according to the outdoor environment temperature.
And S223, detecting the temperature of the outer coil for multiple times by the second temperature sensor within the third set time.
S224, the processor judges whether the temperatures of the external coil pipes are all less than the frost point temperature. If yes, go to step S230. If not, go to step S240.
And S230, the processor adjusts the opening degree of the electronic expansion valve to a third preset opening degree.
S231, the processor judges whether defrosting is finished or not. If yes, go to step S240. If not, the process returns to step S231.
And S240, detecting the running time after defrosting is finished by the processor.
S241, the processor determines whether the operation time is greater than a first set time. If yes, go to step S250. If not, go to step S242.
S242, the processor judges whether the running time is larger than a second set time. If yes, go to step S270. If not, go to step S271.
And S250, determining the target exhaust temperature of the compressor according to the running time by the processor.
In step S260, the processor adjusts the opening degree of the electronic expansion valve according to the target exhaust temperature, and returns to step S221.
S270, the processor adjusts the opening degree of the electronic expansion valve to a first preset opening degree, and returns to step S240.
S271, the processor adjusts the opening degree of the electronic expansion valve to a second preset opening degree, and returns to step S240.
By adopting the method for controlling the electronic expansion valve provided by the embodiment of the disclosure, the electronic expansion valve is opened at the first preset opening degree and the second preset opening degree in the starting stage of the air conditioner, so that the heating speed of the air conditioner in the initial stage can be improved. And in the defrosting stage, the electronic expansion valve is opened at a third preset opening degree, so that the defrosting speed can be increased.
The magnitude of the third set time affects the timing of defrosting. The third setting time is in a value range of [0.5, 1.5] min, and preferably, the third setting time is in a value range of 0.75min, 1min or 1.25 min.
The processor in step S222 determines the frost point temperature according to the outdoor environment temperature, and may determine the frost point temperature by calculation according to a formula in the prior art, or may determine the frost point temperature according to a preset corresponding relationship between the outdoor environment temperature and the frost point temperature.
In the third setting time in step S223, the second temperature sensor detects the temperature of the external coil for a plurality of times, that is, the second temperature sensor detects the temperature of the external coil once every certain time. For example, when the third set time is 1min, the second temperature sensor detects the temperature of the outer coil once every 2s, and 30 outer coil temperatures are detected in total.
The processor in step S224 determines whether the temperatures of the external coil pipes are all less than the frost point temperature, and determines whether all the temperatures of the external coil pipes detected within the third set time are all less than the frost point temperature.
As shown in fig. 4, the second set time t1 is the time elapsed during the initial part of the heating mode starting phase. The second setting time t1 is set to be [0.5, 1.5] min, and preferably, the second setting time t1 is set to be 0.75min, 1min or 1.25 min.
Optionally, the first preset opening degree is greater than the second preset opening degree, and the first preset opening degree is smaller than the third preset opening degree. For example, the first preset opening degree is 60% of the total opening degree, the second preset opening degree is 40% of the total opening degree, and the third preset opening degree is the total opening degree. Therefore, the heating speed of the air conditioner in the starting stage is high, and the defrosting speed of the air conditioner in the defrosting stage is high.
As shown in fig. 9, an apparatus for controlling an electronic expansion valve according to an embodiment of the present disclosure includes a processor (processor)41 and a memory (memory) 42. Optionally, the apparatus may further include a Communication Interface (Communication Interface)43 and a bus 44. The processor 41, the communication interface 43, and the memory 42 may communicate with each other via a bus 44. The communication interface 43 may be used for information transfer. The processor 41 may call logic instructions in the memory 42 to perform the method for controlling an electronic expansion valve of the above-described embodiment.
Furthermore, the logic instructions in the memory 42 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product.
The memory 42 is a storage medium and can be used for storing software programs, computer executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 41 executes functional applications and data processing by executing program instructions/modules stored in the memory 42, i.e. implements the method for controlling an electronic expansion valve in the above-described embodiment.
The memory 42 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 42 may include a high speed random access memory and may also include a non-volatile memory.
The embodiment of the disclosure provides an air conditioner, which comprises the device for controlling the electronic expansion valve.
Embodiments of the present disclosure provide a storage medium storing computer-executable instructions configured to perform the above-described method for controlling an electronic expansion valve.
The storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (10)

1. A method for controlling an electronic expansion valve, comprising:
detecting the operation time after defrosting is finished under the condition that the air conditioner operates in a heating mode;
determining a target discharge temperature of the compressor according to the operation time under the condition that the operation time is greater than a first set time;
and adjusting the opening degree of the electronic expansion valve according to the target exhaust temperature.
2. The method of claim 1, wherein determining a target discharge temperature for the compressor based on the run time comprises:
determining a frosting stage corresponding to the running time according to the running time;
and determining the target exhaust temperature of the compressor corresponding to the frosting stage according to the frosting stage.
3. The method of claim 1, wherein adjusting the opening degree of the electronic expansion valve based on the target exhaust temperature comprises:
determining the target opening degree of the electronic expansion valve through Proportional Integral Derivative (PID) operation according to the target exhaust temperature;
the opening degree of the electronic expansion valve is adjusted to a target opening degree.
4. The method of claim 3, wherein determining the target opening degree of the electronic expansion valve by a PID operation based on the target exhaust temperature comprises:
detecting the current exhaust temperature of the compressor;
determining a difference between the current exhaust temperature and a target exhaust temperature;
and determining the target opening degree of the electronic expansion valve by using the difference value of the exhaust temperatures as deviation through PID calculation.
5. The method of claim 1, after detecting a run time after defrosting is completed, further comprising:
under the condition that the running time is less than or equal to a first set time and is greater than a second set time, the opening degree of the electronic expansion valve is adjusted to a first preset opening degree;
under the condition that the running time is less than or equal to a second set time, the opening degree of the electronic expansion valve is adjusted to a second preset opening degree;
the first preset opening degree is larger than the second preset opening degree.
6. The method of any of claims 1 to 5, further comprising:
and under the condition that the air conditioner operates in the defrosting mode, adjusting the opening degree of the electronic expansion valve to a third preset opening degree.
7. The method of claim 6, further comprising, prior to adjusting the opening degree of the electronic expansion valve to a third preset opening degree:
detecting the outdoor environment temperature;
determining the frost point temperature according to the outdoor environment temperature;
detecting the temperature of the outer coil for multiple times within a third set time;
and controlling the air conditioner to operate in a defrosting mode under the condition that the temperature of the outer coil pipe is less than the frost point temperature.
8. An apparatus for controlling an electronic expansion valve, comprising a processor and a memory having stored program instructions, wherein the processor is configured to execute, upon execution of the program instructions, a method for controlling an electronic expansion valve according to any of claims 1 to 7.
9. An air conditioner characterized by comprising the apparatus for controlling an electronic expansion valve according to claim 8.
10. A storage medium storing program instructions which, when executed, perform a method for controlling an electronic expansion valve according to any one of claims 1 to 7.
CN202111609582.XA 2021-12-27 2021-12-27 Method and device for controlling electronic expansion valve, air conditioner and storage medium Pending CN114383268A (en)

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