CN113739344A - Control method of internal expansion valve, air conditioner and computer readable storage medium - Google Patents

Control method of internal expansion valve, air conditioner and computer readable storage medium Download PDF

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Publication number
CN113739344A
CN113739344A CN202111112918.1A CN202111112918A CN113739344A CN 113739344 A CN113739344 A CN 113739344A CN 202111112918 A CN202111112918 A CN 202111112918A CN 113739344 A CN113739344 A CN 113739344A
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air conditioner
expansion valve
delta
control method
temperature
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CN113739344B (en
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陈冬
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature

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

Abstract

The invention provides a control method of an internal expansion valve, an air conditioner and a computer readable storage medium, wherein the control method comprises the following steps: s1, starting the air conditioner, and controlling the expansion valve to operate at an initial opening degree; s2, detecting the room temperature Tn, and acquiring a difference value delta T between the Tn and a preset target temperature Ts; s3, judging whether the absolute value of the delta T is more than or equal to T1; if yes, go to S4; otherwise, go to S5; s4, regulating and controlling the opening of the expansion valve according to the superheat degree of the evaporator and the target superheat degree; s5, regulating and controlling the opening of the expansion valve according to the delta T and the room temperature variation delta T' in unit time; on one hand, the invention improves the operation reliability and the applicability of the whole control method, on the other hand, under the special condition that the room temperature is closer to the set temperature, the opening of the expansion valve is accurately adjusted according to the difference of the indoor environment temperature conditions, the output capacity of the air conditioner can be effectively correlated with the actual demand capacity of the room, and the output capacity of the air conditioner is accurately adjusted and controlled.

Description

Control method of internal expansion valve, air conditioner and computer readable storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an internal expansion valve, an air conditioner and a computer readable storage medium.
Background
The air conditioner is indispensable electrical equipment in people's daily life, has diversified structural style. With the continuous improvement of the industrial design level and the application of new processes, new materials, new shapes and new technologies to the air conditioner, not only various air conditioners are developed, but also the control methods of the air conditioner under different operation scenes are correspondingly improved.
Taking a multi-split air conditioner as an example, the outdoor unit is mainly adjusted by the frequency of the compressor to achieve a target low pressure or high pressure (refrigeration-controlled low pressure, heating-controlled high pressure), and the indoor unit controls the output capacity of the indoor unit (i.e. the refrigeration capacity or heating capacity of the air conditioner) through the electronic expansion valve of the indoor unit. For the control idea of the internal expansion valve, when the indoor demand is large, the opening degree of the internal expansion valve is large, the circulation amount of the refrigerant is large, and the output capacity of the cold or heat of the air conditioner is large; when the indoor demand is small, the opening degree of the internal machine valve is small, the refrigerant circulation amount is small, and the output capacity of the air conditioner is small.
In the existing control method of the internal expansion valve, after the expansion valve runs for a period of time at a specific initial opening degree, corresponding superheat degree parameters are detected, and the opening degree of the expansion valve is adjusted according to the superheat degree condition; taking refrigeration as an example, when the actual superheat degree is less than the target superheat degree, the valve step of the expansion valve is reduced; when the actual superheat degree is larger than the target superheat degree, the valve step of the expansion valve is increased. However, in the operation process of the air conditioner, the heat (or cooling capacity) actually required in a room changes continuously, and particularly when the room temperature is closer to the set temperature, the method for controlling the expansion valve of the internal unit in the prior art often has the problem of poor correlation between the output capacity of the air conditioner and the actual demand capacity of the room, and is difficult to accurately control the output capacity of the air conditioner, so that the situation that the actual demand capacity of the room is small, but the output capacity of the air conditioner is large easily occurs, and thus the air conditioner is easily subjected to frequent shutdown at a temperature, and the comfort experience of a user is affected.
Disclosure of Invention
In view of the above, the present invention is directed to a method for controlling an internal expansion valve, an air conditioner, and a computer readable storage medium, so as to solve the problems in the prior art that the correlation between the output capacity of the air conditioner and the actual demand capacity of a room is poor, and it is difficult to accurately control the output capacity of the air conditioner.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control method of an internal expansion valve, comprising: s1, starting the air conditioner, and controlling the expansion valve to operate at the initial opening degree for a first preset time period t 1; s2, detecting the indoor environment temperature Tn in real time by the air conditioner, and acquiring a difference value delta T between Tn and a preset target temperature Ts; s3, judging whether the absolute value of the delta T is larger than or equal to a preset threshold T1 by the air conditioner; if yes, go to step S4; if not, go to step S5; s4, the air conditioner obtains the superheat degree of the evaporator and the target superheat degree, and the opening degree of the expansion valve is regulated and controlled according to the superheat degree of the evaporator and the target superheat degree; s5, the air conditioner obtains the delta T and the variation delta T 'of the indoor environment temperature in unit time in real time, and the opening of the expansion valve is regulated and controlled according to the delta T and the delta T'; in step S3, T1 was 1 ℃ to 4 ℃. Therefore, according to the specific difference condition between the room temperature and the set temperature, the process of regulating the valve opening degree by the superheat degree and the process of regulating the valve opening degree by the indoor environment temperature are adopted respectively, the two processes can be executed independently, and corresponding processing is carried out respectively aiming at different conditions; this one side makes the air conditioner no matter under what kind of running condition, can both adopt the more suitable expansion valve regulation and control mode fast effectively, be favorable to improving the operational reliability and the suitability of whole control method, on the other hand is under the special circumstances that room temperature and settlement temperature are more close, this application comes the expansion valve aperture of adjusting accurately through the difference of the indoor environment temperature condition, can be effectively relevant air conditioner output capacity and room actual demand ability, and regulate and control air conditioner output capacity accurately, be favorable to carrying out accurate accuse temperature to indoor, avoid appearing frequently reaching the warm machine halt, experience with the use of guarantee user.
Further, in step S1, the air conditioner start includes at least one of the air conditioner being started immediately, the air conditioner being started for the first time, and the air conditioner being restarted after reaching a temperature and stopping; if the air conditioner is started immediately or the air conditioner is started for the first time, taking the calculated opening P1 of the expansion valve as the initial opening of the expansion valve; when the air conditioner is restarted after the air conditioner is stopped at the temperature, the minimum value of the calculated opening degree P1 of the expansion valve and the opening degree P2 of the air conditioner before the last stop at the temperature is used as the initial opening degree of the expansion valve. Wherein, P1 is K1 is P0, K1 is a dimensionless coefficient, and P0 is a preset opening degree. Therefore, the air conditioner control method and the air conditioner control device have the advantages that corresponding specific control is conducted on the initial opening degree of the expansion valve according to different air conditioner starting conditions, so that the initial opening degree of the expansion valve, which is more fit with actual requirements of a current room, can be obtained in different operation stages of the air conditioner, the initial output capacity of the air conditioner in the corresponding operation stages is ensured, the accuracy of the air conditioner regulation and control process is improved under different operation conditions, the air conditioner can be effectively prevented from being frequently stopped when reaching the temperature, and the user is ensured to have good comfort experience.
Further, step S4 includes: s41, detecting the outlet pipe temperature and the inlet pipe temperature of the evaporator by the air conditioner, and acquiring the superheat degree of the evaporator and a target superheat degree; s42, the air conditioner obtains the opening variation quantity delta P of the expansion valve according to the superheat degree of the evaporator and the target superheat degree; s43, the air conditioner adjusts the initial opening of the expansion valve according to the opening variation quantity delta P of the expansion valve; s44, the air conditioner acquires the delta T in real time, and judges whether the delta T is always equal to or larger than a preset threshold value T1 within a second preset time period T2; if yes, return to step S41; if not, the process proceeds to step S5. Wherein, the superheat degree of the evaporator is the temperature of an outlet pipe of the evaporator-the temperature of an inlet pipe of the evaporator; Δ P is K2 ═ actual superheat degree — target superheat degree, K2 is a preset calculation coefficient, and K2 is 2 to 8. Preferably, the target degree of superheat is 1 ℃ to 8 ℃; the second preset duration t2 is the valve step adjustment period, and t2 is 20s-60 s. Therefore, in step S4, when the difference between the room temperature and the set temperature is large, the valve opening is controlled by using the superheat degree of the air conditioner evaporator, which is beneficial to improving the reliability of the whole control method, and on the other hand, the output capacity of the air conditioner can be quickly and efficiently adjusted when the difference between the room temperature and the set temperature is large, so that the room temperature can be quickly close to the set temperature.
Further, in step S5, the opening degree of the expansion valve is fuzzy-controlled based on Δ T and Δ T'; in the air conditioner in the cooling mode, the valve step of the opening degree of the expansion valve is increased along with the increase of the delta T and the delta T ', and is decreased along with the decrease of the delta T and the delta T'; in the heating mode of the air conditioner, the valve step of the opening degree of the expansion valve is increased along with the increase of the-Delta T and the-Delta T 'and is reduced along with the reduction of the-Delta T and the-Delta T'; preferably, on the basis of the relationship between the valve step of the opening degree of the expansion valve and Δ T, Δ T', the process of the fuzzy control specifically comprises: and obtaining the valve step adjusting condition of the opening of the expansion valve by a table look-up mode according to the delta T and the delta T'. Thereby step S5 in this application, adjust the expansion valve aperture through the indoor ambient temperature condition, not only can adjust the expansion valve aperture through the process of carrying out step S1 and step S5, and this application is under the room temperature and the special condition that the settlement temperature is more close, can adjust the expansion valve aperture through the difference of the indoor ambient temperature condition accurately, can be effectively relevant air conditioner output capacity and room actual demand ability, and adjust and control air conditioner output capacity accurately, be favorable to carrying out accurate accuse temperature to indoor, avoid appearing frequently reaching the warm shutdown, experience in order to ensure user' S use.
An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement a method of controlling the internal expansion valve.
A computer-readable storage medium storing a computer program which, when read and executed by a processor, implements a method of controlling the internal expansion valve.
Compared with the prior art, the control method of the internal expansion valve, the air conditioner and the computer readable storage medium have the following advantages:
according to the control method of the internal expansion valve, the air conditioner and the computer readable storage medium, the process of regulating the opening degree of the superheat degree regulating valve and the process of regulating the opening degree of the indoor environment temperature regulating valve are adopted respectively according to the specific difference condition between the room temperature and the set temperature, the two processes can be executed independently, and corresponding processing is carried out respectively aiming at different conditions; this one side makes the air conditioner no matter under what kind of running condition, can both adopt the more suitable expansion valve regulation and control mode fast effectively, be favorable to improving the operational reliability and the suitability of whole control method, on the other hand is under the special circumstances that room temperature and settlement temperature are more close, this application comes the expansion valve aperture of adjusting accurately through the difference of the indoor environment temperature condition, can be effectively relevant air conditioner output capacity and room actual demand ability, and regulate and control air conditioner output capacity accurately, be favorable to carrying out accurate accuse temperature to indoor, avoid appearing frequently reaching the warm machine halt, experience with the use of guarantee user.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart of a control method of an internal expansion valve according to an embodiment of the present invention.
Detailed Description
The inventive concepts of the present disclosure will be described hereinafter using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. These inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Meanwhile, the expansion valve in the application mainly refers to an expansion valve of an air conditioner indoor unit, and the structure, the installation condition and the working principle of the expansion valve are the prior art and are not repeated herein.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In the operation process of the air conditioner, the heat (or cold) actually required in a room changes continuously, and particularly under the condition that the room temperature is closer to the set temperature, the problem that the correlation between the output capacity of the air conditioner and the actual demand capacity of the room is poor often exists in the existing control method for the internal machine expansion valve, the output capacity of the air conditioner is difficult to control accurately, the situation that the actual demand capacity of the room is small but the output capacity of the air conditioner is large easily occurs, and therefore the air conditioner is prone to being frequently stopped at a temperature, and the comfort experience of a user is affected.
In order to solve the problems existing in the prior art that the correlation between the air conditioner output capacity and the actual demand capacity of a room is poor, and it is difficult to accurately control the air conditioner output capacity, the present embodiment provides a control method of an internal expansion valve, as shown in fig. 1, where the control method includes:
s1, starting the air conditioner, and controlling the expansion valve to operate at the initial opening degree for a first preset time period t 1;
the air conditioner is started in a specific operation mode, such as a refrigeration mode, a heating mode, a dehumidification mode, a fresh air mode and the like; the present application is mainly directed to a mode for adjusting and controlling an indoor temperature, such as a cooling mode and a heating mode. Similarly, the air conditioner start may refer to the air conditioner just starting up, or the air conditioner starts up for the first time, or the air conditioner restarts after reaching a temperature and stopping.
In addition, the first preset time period t1 is air conditioner preset data, which is data preset in an air conditioner data storage device by an air conditioner manufacturer, and t1 suggests that the data is determined according to actual production and manufacturing conditions in view of different conditions of development processes, air conditioner performance requirements and the like of different air conditioner manufacturers. In the present application, t1 is mainly used to ensure the stable operation of the system, and is generally 1min-5 min.
Regarding the initial opening degree of the expansion valve, the application divides the air conditioner into two cases according to the actual operation process of the air conditioner:
in case one, the air conditioner is just started, or the air conditioner is started for the first time.
In this case, a calculated opening degree P1 of the expansion valve is obtained, P1 is taken as an initial opening degree of the expansion valve, and P1 is K1 × P0; wherein K1 is a dimensionless coefficient and is determined by the difference Delta T between the current indoor environment temperature Tn and the preset target temperature Ts; taking refrigeration as an example, K1 increases with the increase of Δ T, because the larger Δ T indicates that the difference between the actual temperature of the room and the set temperature is large, the larger the required cooling capacity is, the larger the required refrigerant flow is, and the larger the corresponding initial opening degree of the expansion valve is; the P0 is a preset opening corresponding to different outdoor environment temperatures Tw, when the outdoor temperature is higher, the P0 is larger, and the heat load of a room is larger because the outdoor temperature is higher, the flow is increased and the heat exchange is improved by increasing the P0. For example, P0 is 150pls at an outdoor ambient temperature of 30 ℃; when the outdoor environment temperature is 35 ℃, the P0 is 180 pls; when DeltaT is 2 ℃, K1 is 0.8; at 5 ℃, K1 is 1.
And in the second situation, the air conditioner is restarted after being stopped when reaching the temperature.
In this case, the calculated opening degree P1 of the expansion valve is obtained, which is the same as in case 1 and will not be described again; in addition, the opening degree P2 of the air conditioner before the last warm-stop is obtained (P2 specifically refers to the opening degree value of the last expansion valve before the warm-stop is reached for avoiding ambiguity); the air conditioner then takes the minimum value of P1 and P2 as the initial opening degree of the expansion valve. For example, when the opening degree P2 before the latest shutdown is 80pls and the calculated opening degree P1 of the expansion valve is 100pls, the initial opening degree of the expansion valve is 80 pls.
Therefore, in the process of acquiring the initial opening degree of the expansion valve under the second condition, the P2 is screened, and after the temperature-reaching shutdown occurs, the output capacity of the air conditioner before the temperature-reaching shutdown is larger than the required capacity of an actual room, namely the output capacity of the air conditioner at the opening degree P2, so that the actual demand of the room can be met. Through selecting the minimum value in P1, P2 as the initial aperture of expansion valve for the air conditioner can restart the operation with the output ability that more laminates current room actual demand, is favorable to carrying out accurate accuse temperature to indoor, avoids appearing frequently reaching the warm shutdown, experiences with the use of guarantee user.
In step S1, by performing corresponding specific control on the initial opening degree of the expansion valve in the first and second cases, the initial opening degree of the expansion valve more suitable for the actual requirements of the current room can be obtained in different operation stages of the air conditioner, so as to ensure the initial output capacity of the air conditioner in the corresponding operation stages, thereby improving the accuracy of the air conditioner in the regulation and control process under different operation conditions, effectively avoiding frequent shutdown due to temperature reaching, and ensuring that the user has good comfort experience.
S2, detecting the indoor environment temperature Tn in real time by the air conditioner, and acquiring a difference value delta T between Tn and a preset target temperature Ts;
wherein Δ T ═ Tn-Ts; the detection of the indoor environment temperature can adopt the prior art and is not described in detail; the preset target temperature Ts is a target temperature which needs to be reached by the air conditioner in a corresponding operation mode, and can be determined by remote control of a user or can be intelligently determined by the air conditioner according to relevant environmental conditions.
S3, judging whether the absolute value of the delta T is larger than or equal to a preset threshold T1 by the air conditioner; if yes, go to step S4; if not, go to step S5;
wherein, T1 is air conditioner preset data, and is data preset in the air conditioner data storage device by the air conditioner manufacturer, and T1 suggests to be determined by actual manufacturing conditions in view of different conditions of development process, air conditioner performance requirement, and the like of different air conditioner manufacturers. In the present application, T1 is from 1 ℃ to 4 ℃.
Therefore, through the determination in the step S3, when the room temperature is much different from the set temperature, the step S4 is performed, and the superheat degree condition of the air conditioner evaporator is preferably adopted for regulation, on one hand, the technology for regulating the opening degree of the expansion valve by using the superheat degree is mature and stable, which is beneficial to improving the reliability of the whole control method, and on the other hand, although the process of regulating the opening degree of the expansion valve by using the superheat degree condition is relatively difficult to accurately control the output capacity of the air conditioner, the processing method can quickly and efficiently regulate the output capacity of the air conditioner under the condition that the room temperature is much different from the set temperature, so that the room temperature can be quickly close to the set temperature; when the room temperature is close to the set temperature, step S5 is carried out, the expansion valve opening is preferably adjusted according to the indoor environment temperature condition, the expansion valve opening is accurately adjusted according to the difference of the indoor environment temperature condition, the air conditioner output capacity and the actual room demand capacity can be effectively correlated, the air conditioner output capacity is accurately regulated and controlled, accurate indoor temperature control is facilitated, frequent temperature reaching shutdown is avoided, and the use experience of a user is guaranteed.
S4, the air conditioner obtains the superheat degree of the evaporator and the target superheat degree, and the opening degree of the expansion valve is regulated and controlled according to the superheat degree of the evaporator and the target superheat degree;
wherein, step S4 includes:
s41, detecting the outlet pipe temperature and the inlet pipe temperature of the evaporator by the air conditioner, and acquiring the superheat degree of the evaporator and a target superheat degree;
wherein, the superheat degree of the evaporator is the temperature of an outlet pipe of the evaporator-the temperature of an inlet pipe of the evaporator; the target superheat degree is preset data of the air conditioner, is preset data in an air conditioner data storage device by an air conditioner manufacturer, and is determined according to actual production and manufacturing conditions in consideration of different conditions of development processes, air conditioner performance requirements and the like of different air conditioner manufacturers. In the application, the target superheat degree mainly considers the refrigeration or heating effect of the air conditioner and the reliability of operation, and is generally 1-8 ℃.
S42, the air conditioner obtains the opening variation quantity delta P of the expansion valve according to the superheat degree of the evaporator and the target superheat degree;
where Δ P is K2 ═ the actual superheat degree — the target superheat degree, K2 is a preset calculation coefficient, and is data preset in the air conditioner data storage device by the air conditioner manufacturer, and in view of the differences in the conditions of the development process, the air conditioner performance requirements, and the like of different air conditioner manufacturers, K2 suggests that the actual production and manufacturing conditions are determined. In the application, the K2 mainly considers the factors such as the system operation reliability, the adjusting speed and the like comprehensively, and generally takes a value of 2-8.
S43, the air conditioner adjusts the initial opening of the expansion valve according to the opening variation quantity delta P of the expansion valve;
the adjustment process of step S43 is to decrease or increase the opening degree of the expansion valve by the actual value of Δ P based on the initial opening degree of the expansion valve, which is similar to the conventional process of decreasing or increasing the opening degree of the expansion valve.
S44, the air conditioner acquires the delta T in real time, and judges whether the delta T is always equal to or larger than a preset threshold value T1 within a second preset time period T2; if yes, return to step S41; if not, the process proceeds to step S5.
The acquisition of the Δ T is consistent with the process of step S2, and is not described in detail; t2 is air conditioner preset data, which is data preset in the air conditioner data storage device by the air conditioner manufacturer, and t2 suggests that the data is determined by actual production and manufacturing conditions in view of different conditions of development processes, air conditioner performance requirements and the like of different air conditioner manufacturers. In the present application, t2 may be regarded as preset time duration data, or may be regarded as a valve step adjustment period, that is, t2 is regarded as a valve step adjustment period to periodically adjust the opening degree of the expansion valve when a specific condition is satisfied. Preferably, t2 is 20s-60s, and accordingly, it can be considered that the valve step adjustment period is 20s-60 s.
And S5, the air conditioner acquires the delta T and the variation delta T 'of the indoor environment temperature in unit time in real time, and regulates and controls the opening of the expansion valve according to the delta T and the delta T'.
The acquisition of the Δ T is consistent with the process of step S2, and is not described in detail; the acquisition of Δ T' is the same as one would conventionally recognize the amount of temperature change, i.e., Δ T ═ TRear end-TFront side，TRear endIs the room temperature after a unit time (or the current room temperature), TFront sideRoom temperature before the unit time.
In addition, the unit time may refer to single preset air conditioner duration information or may refer to a valve step adjustment period; in the present application, it is preferable that the unit time in the step S5 and the second preset time period t2 in the step S44 are the same preset time period information, which refers to the time period of one valve step adjustment period; one valve step adjustment period is 20s-60 s.
In step S5, fuzzy control is performed on the expansion valve opening degree based on Δ T and Δ T'; in the air conditioner in the cooling mode, the valve step of the opening degree of the expansion valve is increased along with the increase of the delta T and the delta T ', and is decreased along with the decrease of the delta T and the delta T'; in the heating mode of the air conditioner, the valve step of the opening degree of the expansion valve is increased along with the increase of the-Delta T and the-Delta T 'and is reduced along with the reduction of the-Delta T and the-Delta T'; on the basis of the relationship between the valve steps of the opening degree of the expansion valve and Δ T ', the fuzzy control process preferably uses a table look-up method according to Δ T and Δ T' to obtain the valve step adjustment condition of the opening degree of the expansion valve.
Specifically, the adjustment condition of the opening degree of the expansion valve obtained by table lookup may be a specific valve step number, a specific valve step adjustment value, or an adjustment coefficient of the current valve step, and the specific value or coefficient is determined according to the actual production and manufacturing conditions in consideration of the differences of the research and development processes, the air-conditioning performance requirements, and the like of different air-conditioning manufacturers. Correspondingly, the specific table lookup information is also preset data of the air conditioner, and the specific data suggestion for table lookup is determined according to actual production and manufacturing conditions in view of different conditions of research and development processes, air conditioner performance requirements and the like of different air conditioner manufacturers.
In the present application, taking the refrigeration mode as an example, a relation table between Δ T and Δ T' and the valve step adjustment value is provided, which can be regarded as a fine adjustment and control table of the opening degree of the expansion valve, and is specifically shown in table 1.
TABLE 1
Figure BDA0003274459300000081
In the numerical range representation of Δ T and Δ T', the use of small brackets and middle brackets is a writing mode using a mathematically conventional numerical range. Meanwhile, when table 1 is looked up, if Δ T is between (0.25, 1) and Δ T' is between (0.25, 0.5), the valve step adjustment value can be found to be +4, i.e., the current valve step value is increased by 4 valve steps based on the current opening degree of the air conditioner control expansion valve.
In addition, if a fine adjustment and control table of the opening degree of the expansion valve in the heating mode is required, on the basis of table 1, Δ T in the header of table 1 may be changed to- Δ T, and Δ T 'in the header of table 1 may be changed to- Δ T', and may be determined according to actual production and manufacturing conditions of air conditioner manufacturers.
Accordingly, the cooling mode is taken as an example and is explained with reference to table 1:
the delta T' represents the speed of the change of the room temperature, a negative value indicates that the room temperature is continuously reduced, the output capacity of the air conditioner is larger than the actual requirement, a positive value indicates that the temperature is increased, and the output capacity of the air conditioner is smaller than the actual requirement; the larger the absolute value of Δ T', the larger the difference between the air conditioner output capacity and the actual demand. The control idea for Δ T' is thus: after the determination of step S3 or step S44, in the fine adjustment and control process of the expansion valve opening degree in step S5, the valve opening degree is decreased if Δ T ' is a negative value, and the valve opening degree is increased if Δ T ' is a positive value, and the valve step adjustment value is increased as the absolute value of Δ T ' is larger.
For the cold output of the air conditioner, the method is mainly used for two aspects: on the one hand, the room temperature is reduced, and on the other hand, the heat load caused by the temperature difference between the indoor space and the outdoor space or heat leakage is counteracted.
The delta T represents the difference value between the room temperature and the preset temperature, and the delta T is a positive value, which indicates that the room temperature is higher than the preset temperature and the actually needed cold quantity is more indoors; the delta T is a negative value, which indicates that the room temperature is less than the preset temperature, and the actually needed cold energy in the room only needs to maintain the heat dissipation (or heat leakage) of the room; therefore, after the determination of step S3 or step S44, for performing the fine adjustment and control process of the opening degree of the expansion valve in step S5, the larger Δ T, the larger the valve step opening degree; the smaller the Delta T is, the smaller the valve step opening is, and when the T is a negative value (generally taking the value of-1 to-2 ℃), the machine is stopped at a temperature reaching state.
Therefore, for the refrigeration mode, in table 1, Δ T is large at the upper right corner and Δ T' is large, which indicates that the output cold quantity of the air conditioner is far smaller than the actual demand, and the expansion valve needs to be opened quickly; the lower left corner is small in delta T and small in delta T', which shows that the output cold quantity of the air conditioner is far larger than the actual requirement, and the expansion valve needs to be quickly closed; the content between the upper left corner and the lower right corner is the combination of two factors of delta T and delta T ', the valve step needs to be closed in the process from positive to negative of the delta T', but if the delta T temperature difference is large, the valve step needs to be increased, and large cold energy is output. Therefore, the fine control table of the actual opening degree of the expansion valve suggests that the balance relationship thereof is confirmed according to the actual situation.
Therefore, the fine regulation and control table of the opening of the expansion valve shown in the table 1 is obtained by comprehensively considering the delta T and the delta T ', and in the step S5, the regulation condition of the opening of the expansion valve is obtained by looking up the table according to the delta T and the delta T ', so that when the room temperature is close to the set temperature, the opening of the expansion valve can be accurately regulated according to the specific conditions of the delta T and the delta T ', the output capacity of the air conditioner can be effectively correlated with the actual demand capacity of a room, the output capacity of the air conditioner can be accurately regulated and controlled, the indoor accurate temperature control is facilitated, the frequent shutdown caused by reaching the temperature is avoided, and the use experience of a user is guaranteed.
In addition, in the control method of the present application, step S4 is a process of adjusting the valve opening degree by using the superheat degree condition of the air conditioner evaporator, and step S5 is a process of adjusting the valve opening degree by using the indoor ambient temperature condition; in the present application, the operations of steps S2, S3, and S4 may be omitted, and only the processes of step S1 and step S5 are performed, that is, the present application may adjust the valve opening only by using the indoor ambient temperature condition without using the superheat condition to adjust the valve opening.
Therefore, in the control method, according to the specific difference condition between the room temperature and the set temperature, the process of regulating the valve opening degree by the superheat degree and the process of regulating the valve opening degree by the indoor environment temperature are adopted respectively, the two processes can be executed independently, and corresponding processing is carried out respectively aiming at different conditions; this one side makes the air conditioner no matter under what kind of running condition, can both adopt the more suitable expansion valve regulation and control mode fast effectively, be favorable to improving the operational reliability and the suitability of whole control method, on the other hand is under the special circumstances that room temperature and settlement temperature are more close, this application comes the expansion valve aperture of adjusting accurately through the difference of the indoor environment temperature condition, can be effectively relevant air conditioner output capacity and room actual demand ability, and regulate and control air conditioner output capacity accurately, be favorable to carrying out accurate accuse temperature to indoor, avoid appearing frequently reaching the warm machine halt, experience with the use of guarantee user.
The invention also provides an air conditioner, which adopts a control method of the internal expansion valve; the air conditioner comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and the computer program is read by the processor and runs the processor to realize the control method of the internal expansion valve; in addition, for the specific component structure of the air conditioner, the prior art can be used for reference, and the details are not repeated herein. Meanwhile, the application also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and executed by a processor, the computer program realizes a control method of the internal expansion valve.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A control method of an internal expansion valve, characterized by comprising:
s1, starting the air conditioner, and controlling the expansion valve to operate at the initial opening degree for a first preset time period t 1;
s2, detecting the indoor environment temperature Tn in real time by the air conditioner, and acquiring a difference value delta T between Tn and a preset target temperature Ts;
s3, judging whether the absolute value of the delta T is larger than or equal to a preset threshold T1 by the air conditioner; if yes, go to step S4; if not, go to step S5;
s4, the air conditioner obtains the superheat degree of the evaporator and the target superheat degree, and the opening degree of the expansion valve is regulated and controlled according to the superheat degree of the evaporator and the target superheat degree;
and S5, the air conditioner acquires the delta T and the variation delta T 'of the indoor environment temperature in unit time in real time, and regulates and controls the opening of the expansion valve according to the delta T and the delta T'.
2. The control method for the internal expansion valve according to claim 1, wherein in step S1, the air conditioner start-up includes at least one of an air conditioner start-up immediately after the air conditioner starts up, an air conditioner starts up for the first time, and a restart after the air conditioner stops at a warm temperature;
if the air conditioner is started immediately or the air conditioner is started for the first time, taking the calculated opening P1 of the expansion valve as the initial opening of the expansion valve;
when the air conditioner is restarted after the air conditioner is stopped at the temperature, the minimum value of the calculated opening degree P1 of the expansion valve and the opening degree P2 of the air conditioner before the last stop at the temperature is used as the initial opening degree of the expansion valve.
3. The control method of an internal expansion valve according to claim 2, wherein P1 is K1 is P0, K1 is a dimensionless coefficient, and P0 is a preset opening degree.
4. The control method for the internal expansion valve according to claim 1, wherein in step S3, T1 is 1 ℃ to 4 ℃.
5. The control method of an internal expansion valve according to claim 1, wherein step S4 includes:
s41, detecting the outlet pipe temperature and the inlet pipe temperature of the evaporator by the air conditioner, and acquiring the superheat degree of the evaporator and a target superheat degree;
s42, the air conditioner obtains the opening variation quantity delta P of the expansion valve according to the superheat degree of the evaporator and the target superheat degree;
s43, the air conditioner adjusts the initial opening of the expansion valve according to the opening variation quantity delta P of the expansion valve;
s44, the air conditioner acquires the delta T in real time, and judges whether the delta T is always equal to or larger than a preset threshold value T1 within a second preset time period T2; if yes, return to step S41; if not, the process proceeds to step S5.
6. The control method of an internal expansion valve according to claim 5, wherein the evaporator superheat degree is evaporator outlet pipe temperature-evaporator inlet pipe temperature;
Δ P is K2 ═ actual superheat degree — target superheat degree, K2 is a preset calculation coefficient, and K2 is 2 to 8.
7. The control method of the internal expansion valve according to claim 5, wherein the target degree of superheat is 1 ℃ to 8 ℃; the second preset duration t2 is the valve step adjustment period, and t2 is 20s-60 s.
8. The control method for an internal expansion valve according to claim 1, wherein in step S5, the opening degree of the expansion valve is fuzzy controlled according to Δ T and Δ T'; the valve steps of the expansion valve opening degree increase with increasing Δ T and Δ T ', and decrease with decreasing Δ T and Δ T'.
9. An air conditioner, characterized by comprising a computer-readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the control method of the internal expansion valve according to any one of claims 1 to 8.
10. A computer-readable storage medium, wherein a computer program is stored, which when read and executed by a processor, implements a control method of an internal expansion valve according to any one of claims 1 to 8.
CN202111112918.1A 2021-09-23 2021-09-23 Control method of internal expansion valve, air conditioner and computer readable storage medium Active CN113739344B (en)

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CN115031349A (en) * 2022-07-19 2022-09-09 广东欧科空调制冷有限公司 Control method for superheat degree safety of multi-connected air conditioner expansion valve fault system
CN115111701A (en) * 2022-07-13 2022-09-27 广东美的制冷设备有限公司 Control method of air conditioner, controller, air conditioner and storage medium
CN115289617A (en) * 2022-08-12 2022-11-04 宁波奥克斯电气股份有限公司 Control method for preventing air conditioner from freezing, air conditioner and computer readable storage medium
CN115523591A (en) * 2022-08-17 2022-12-27 宁波奥克斯电气股份有限公司 Control method and device for electronic expansion valve of indoor unit and central air conditioner

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CN106642563A (en) * 2016-12-13 2017-05-10 青岛海尔空调器有限总公司 Control method of air-conditioner expansion valve, control device and air-conditioner
CN110762729A (en) * 2019-09-23 2020-02-07 宁波奥克斯电气股份有限公司 Method for controlling air conditioner and air conditioner

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CN103162385A (en) * 2013-04-02 2013-06-19 四川长虹电器股份有限公司 Device and method of adjusting electronic expansion valve of refrigeration equipment
CN106642563A (en) * 2016-12-13 2017-05-10 青岛海尔空调器有限总公司 Control method of air-conditioner expansion valve, control device and air-conditioner
CN110762729A (en) * 2019-09-23 2020-02-07 宁波奥克斯电气股份有限公司 Method for controlling air conditioner and air conditioner

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Publication number Priority date Publication date Assignee Title
CN115111701A (en) * 2022-07-13 2022-09-27 广东美的制冷设备有限公司 Control method of air conditioner, controller, air conditioner and storage medium
CN115111701B (en) * 2022-07-13 2024-05-28 广东美的制冷设备有限公司 Air conditioner control method, controller, air conditioner and storage medium
CN115031349A (en) * 2022-07-19 2022-09-09 广东欧科空调制冷有限公司 Control method for superheat degree safety of multi-connected air conditioner expansion valve fault system
CN115289617A (en) * 2022-08-12 2022-11-04 宁波奥克斯电气股份有限公司 Control method for preventing air conditioner from freezing, air conditioner and computer readable storage medium
CN115289617B (en) * 2022-08-12 2024-05-10 宁波奥克斯电气股份有限公司 Anti-freezing control method for air conditioner, air conditioner and computer readable storage medium
CN115523591A (en) * 2022-08-17 2022-12-27 宁波奥克斯电气股份有限公司 Control method and device for electronic expansion valve of indoor unit and central air conditioner

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