CN113418275A - Control method of electronic expansion valve of internal machine in multi-split air conditioner - Google Patents

Control method of electronic expansion valve of internal machine in multi-split air conditioner Download PDF

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Publication number
CN113418275A
CN113418275A CN202110526026.XA CN202110526026A CN113418275A CN 113418275 A CN113418275 A CN 113418275A CN 202110526026 A CN202110526026 A CN 202110526026A CN 113418275 A CN113418275 A CN 113418275A
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China
Prior art keywords
expansion valve
electronic expansion
parameter
indoor unit
opening degree
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CN202110526026.XA
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CN113418275B (en
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刘世震
刘志胜
隋志蔚
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202110526026.XA priority Critical patent/CN113418275B/en
Publication of CN113418275A publication Critical patent/CN113418275A/en
Priority to PCT/CN2022/098495 priority patent/WO2022237912A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F24F2013/247—Active noise-suppression
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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

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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)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a control method of an electronic expansion valve of an internal unit in a multi-split air conditioner. The invention aims to solve the problems that the flow of an air pipe is unstable when the opening degree of an electronic expansion valve of an indoor unit of the indoor unit to be heated is in a small range, and the temperature of the air pipe is easily influenced by the exhaust temperature of a compressor, so that the aims of preventing refrigerant noise and ensuring the operation energy efficiency of a system are difficult to achieve simultaneously by the conventional control method. To this end, according to the present invention, when an indoor fan of an indoor unit equipped with an indoor unit electronic expansion valve is in a closed state, a current opening degree adjustment amount of the indoor unit electronic expansion valve is determined based on a current saturated condensing temperature of the indoor unit and a current outlet refrigerant temperature, and an opening degree of the indoor unit electronic expansion valve is controlled according to the current opening degree adjustment amount. The purposes of maintaining the stability and the operation energy efficiency of the air conditioning system and preventing the noise of the refrigerant are basically achieved.

Description

Control method of electronic expansion valve of internal machine in multi-split air conditioner
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method of an electronic expansion valve of an internal unit in a multi-split air conditioner.
Background
The multi-split air conditioning system comprises at least one outdoor unit and a plurality of indoor units. It often happens that the indoor fans of some indoor units are turned on and are in a normal heating state, and the indoor fans of some indoor units are turned off and are in a state to be heated. Because the indoor unit in the heating state exchanges heat with air only through natural convection, in order to avoid excessive refrigerant accumulation in the indoor unit to be heated, the electronic expansion valve of the indoor unit to be heated needs to be maintained in a proper opening range, and if the opening of the electronic expansion valve of the indoor unit to be heated is improperly adjusted, the problems of poor system stability, high refrigerant noise, low system operation energy efficiency and the like can also occur.
At present, in the control of an electronic expansion valve of an indoor unit to be heated, the temperature is mostly adjusted according to the temperature difference of sensors on an air pipe and a liquid pipe of the indoor unit or the outlet liquid temperature of an evaporator.
However, because the flow rate of the air pipe is unstable when the opening degree of the electronic expansion valve of the indoor unit to be heated is in a small range, and the temperature of the air pipe is easily affected by the exhaust temperature of the compressor, the existing control method is difficult to achieve the purposes of preventing refrigerant noise and ensuring the operation energy efficiency of the system at the same time.
Accordingly, there is a need in the art for a new control method for electronic expansion valves of internal combustion engines in multi-split air conditioning systems to solve the above problems.
Disclosure of Invention
The invention provides a control method of an electronic expansion valve of an indoor unit in a multi-split air conditioner, aiming at solving the problems that the flow of an air pipe is unstable when the opening of the electronic expansion valve of the indoor unit to be heated is in a small range, the temperature of the air pipe is easily influenced by the exhaust temperature of a compressor, and the existing control method is difficult to simultaneously achieve the purposes of preventing refrigerant noise and ensuring the operation energy efficiency of the system.
When the control method for the electronic expansion valve of the inner machine in the multi-split air conditioner, which is provided by the invention, is used, the indoor fan of the inner machine provided with the electronic expansion valve of the inner machine is in a closed state, and the control method comprises the following steps: obtaining the current saturated condensing temperature P of the indoor unitd_tAnd the current outlet refrigerant temperature TC11(n); based on the parameter Pd_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the indoor unit electronic expansion valve, and controlling the opening degree of the indoor unit electronic expansion valve according to the parameter delta P (n).
As a preferable technical scheme of the control method provided by the invention, the control method is based on the parameter Pd_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the indoor unit electronic expansion valve, and controlling the opening degree of the indoor unit electronic expansion valve according to the parameter delta P (n), wherein the step comprises the following steps: calculating the current supercooling degree Subcool of the indoor unit as Pd_t-TC11(n); and determining the current opening degree regulating quantity delta P (n) of the internal machine electronic expansion valve based on the parameter Subcool.
As a preferable technical solution of the above control method provided by the present invention, the step of "determining the current opening degree adjustment amount Δ p (n) of the internal machine electronic expansion valve based on the parameter Subcool" includes: comparing the parameter Subcool with a first supercooling degree threshold value and a second supercooling degree threshold value; wherein the first subcooling degree threshold value is less than the second subcooling degree threshold value; Δ p (n) is-1 if Subcool is less than or equal to the first subcooling degree threshold; Δ p (n) is 1 if Subcool is greater than or equal to the second subcooling degree threshold; if Subcool is greater than the first subcooling threshold value and less than the second subcooling threshold value, Δ p (n) is 0.
As a preferable technical solution of the above control method provided by the present invention, the step of "determining the current opening degree adjustment amount Δ p (n) of the internal machine electronic expansion valve based on the parameter Subcool" further includes: obtaining the last opening degree regulating quantity delta P (n-1) of the internal machine electronic expansion valve; obtaining the outlet refrigerant temperature T of the indoor unit before the last adjustment of the electronic expansion valve of the indoor unitC11(n-1); calculating the variation Subchg1 of the outlet refrigerant temperature of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unit, wherein Subchg1 is TC11(n)-TC11(n-1); determining a parameter Subchg corresponding to the current supercooling degree Subcool based on a first mapping relation between the parameter Subcool and a preset variation Subchg of the outlet refrigerant temperature; comparing the parameter Subchg1 with the parameter Subchg; and jointly determining the current opening degree adjustment quantity delta P (n) of the internal machine electronic expansion valve based on the comparison result of the parameter Subchgl and the parameter Subchg, the parameter Subcool and delta P (n-1).
As a preferable aspect of the above control method according to the present invention, the step of "determining the current opening degree adjustment amount Δ P (n) of the internal machine electronic expansion valve based on the comparison result of the parameter Subchg1 and the parameter Subchg, the parameter subchool, and Δ P (n-1) collectively includes: when the parameter Subcool is greater than the maximum value of the set expected supercooling degree, if Subcool 1 > Subcool, Δ p (n) is 0; if Subchg 1. ltoreq.Subchg, Δ P (n) ≧ 0.
As a preferable aspect of the above control method according to the present invention, the step of "determining the current opening degree adjustment amount Δ P (n) of the internal machine electronic expansion valve based on the comparison result of the parameter Subchg1 and the parameter Subchg, the parameter subchool, and Δ P (n-1) collectively includes: when the parameter Subcool is smaller than the minimum value of the set expected supercooling degree, if Subcool 1 < Subcool, Δ p (n) is 0; if Subchg1 is greater than or equal to Subchg, Δ P (n) is less than or equal to 0.
AsThe invention provides an optimized technical scheme of the control method, which is based on the parameter Pd_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the indoor unit electronic expansion valve, and controlling the opening degree of the indoor unit electronic expansion valve according to the parameter delta P (n), wherein the step comprises the following steps: obtaining the outlet refrigerant temperature T of the indoor unit before the last adjustment of the electronic expansion valve of the indoor unitC11(n-1); calculating the variation Subchg1 of the outlet refrigerant temperature of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unit, wherein Subchg1 is TC11(n)-TC11(n-1); based on the parameter Pd_tObtaining the current Target outlet refrigerant temperature Target through a second mapping relation between the Target outlet refrigerant temperature Target and the indoor unit; comparison of the parameters TC11(n) and the magnitude of the parameter Target to determine a first opening degree adjustment amount f (T)C11) (ii) a Wherein, when TC11F (T) when (n) < TargetC11) When T is equal to 1C11When (n) is equal to Target f (T)C11) When T is equal to 0C11(n) > Target f (T)C11) -1; determining a second opening degree adjustment amount f (subbchgl) based on the parameter subbchg 1; wherein f (Subchg1) is 1 when Subchg1 < 0, f (Subchg1) is 0 when Subchg1 is 0, and f (Subchg1) is-1 when Subchg1 > 0; determining the current opening degree adjustment quantity of the internal machine electronic expansion valve as delta P (n) f (T)C11)+f(Subchg1)。
As a preferable technical solution of the control method provided by the present invention, in the second mapping relationship, the parameter P isd_tRespectively corresponds to a parameter Target, and the parameter Target and the parameter Pd_tIs in positive correlation.
As a preferable technical solution of the above control method provided by the present invention, the parameter P is "based ond_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the internal machine electronic expansion valve, and controlling the opening degree of the internal machine electronic expansion valve according to the parameter delta P (n): the minimum flow opening degree is required to be kept for a preset stable time before the internal machine electronic expansion valve is opened, and then adjustment is carried out; in the process of adjusting the electronic expansion valve of the internal machine, when preset updating is carried out at intervalsThe parameter delta P (n) needs to be determined again to control the opening degree of the internal machine electronic expansion valve; if the determined delta P (n) is 1 and the opening degree of the internal electronic expansion valve after the last adjustment reaches the maximum value, keeping the opening degree of the internal electronic expansion valve unchanged; and if the determined delta P (n) is equal to-1 and the internal machine electronic expansion valve is in a closed state after being adjusted last time, continuing to maintain the closed state of the internal machine electronic expansion valve.
As a preferable technical solution of the above control method provided by the present invention, the control method further includes: acquiring the current indoor temperature; and stopping controlling the electronic expansion valve of the internal machine according to the control method after the current indoor temperature is higher than the set normal operating temperature and the indoor fan is in an open state.
According to the control method of the electronic expansion valve of the internal machine in the multi-split air conditioner, when an indoor fan of the indoor machine provided with the electronic expansion valve of the internal machine is in a closed state, the current opening degree regulating quantity of the electronic expansion valve of the internal machine is determined according to the current saturated condensation temperature of the indoor machine and the current outlet refrigerant temperature, and the opening degree of the electronic expansion valve of the internal machine is controlled according to the current opening degree regulating quantity. It can be understood that different exhaust pressures of the compressor have corresponding saturated condensing temperatures of the indoor unit, and the temperature of the outlet refrigerant of the indoor unit is controlled within a temperature range matched with the saturated condensing temperature by adjusting the electronic expansion valve of the indoor unit, so that the indoor unit can be in a better operation state, and the purposes of maintaining the stability and the operation energy efficiency of the air conditioning system and preventing the noise of the refrigerant are basically achieved.
In addition, according to the control method of the electronic expansion valve of the indoor unit in the multi-split air conditioner, the current supercooling degree of the indoor unit is determined based on the current saturated condensing temperature of the indoor unit and the current outlet refrigerant temperature, and the current supercooling degree of the indoor unit is in a normal range between the first supercooling degree threshold value and the second supercooling degree threshold value by adjusting the electronic expansion valve of the indoor unit, so that the aims of maintaining the stability and the operation energy efficiency of the air conditioning system and preventing the noise of the refrigerant can be basically fulfilled.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Moreover, like numerals are used to indicate like parts throughout the figures. The control method of the electronic expansion valve of the indoor unit in the multi-split air conditioning unit is described below with reference to the attached drawings. In the drawings:
FIG. 1 is a schematic diagram of a multi-split air conditioner according to the present embodiment;
fig. 2 is a schematic structural view of an indoor unit in a multi-split air conditioner according to the present embodiment;
fig. 3 is a schematic main flow chart of a control method of the electronic expansion valve of the indoor unit in the multi-split air conditioner according to the present embodiment;
fig. 4 is a detailed flow chart of a control method of an electronic expansion valve of an internal machine in a multi-split air conditioning unit according to embodiment 1;
fig. 5 is a detailed flow chart of a control method of an electronic expansion valve of an internal machine in a multi-split air conditioning unit according to embodiment 2;
fig. 6 is a detailed flowchart of a control method of the electronic expansion valve of the indoor unit in the multi-split air conditioning system according to embodiment 3.
List of reference numerals
1-an outdoor unit; 11-a compressor; 12-an oil separator; 13-a one-way valve; a 14-four-way reversing valve; 15-outdoor heat exchanger; 16-main electronic expansion valve; 17-a gas-liquid separator; 18-air pipe stop valve; 19-liquid pipe stop valve;
2-an indoor unit; 21-indoor heat exchanger; 22-indoor fan; 23-a trachea temperature sensor; 24-liquid tube temperature sensor; 25-internal machine electronic expansion valve; 26-indoor temperature sensor.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present invention has been described in terms of three embodiments, the embodiments of the present invention are not limited to these three embodiments, and those skilled in the art can make modifications as needed to suit specific applications without departing from the principles of the present invention. For example, other control methods for basically achieving the purposes of maintaining the stability and the operation energy efficiency of the air conditioning system and preventing the noise of the refrigerant by determining the current opening degree adjustment amount of the electronic expansion valve of the indoor unit based on the current saturated condensing temperature and the current outlet refrigerant temperature of the indoor unit also belong to the protection scope of the present invention.
In order to solve the above problems in the prior art, that is, to solve the problems that the flow of the air pipe is unstable when the opening of the electronic expansion valve of the indoor unit to be heated is in a small range, and the temperature of the air pipe is easily affected by the exhaust temperature of the compressor, the conventional control method is difficult to simultaneously achieve the purposes of preventing the occurrence of refrigerant noise and ensuring the operation energy efficiency of the system, the embodiment provides a control method for the electronic expansion valve of the indoor unit in the multi-split air-conditioning system. In this embodiment, a control method of an electronic expansion valve of an indoor unit in a multi-split air conditioning system according to this embodiment is described by combining a schematic structural diagram of the multi-split air conditioning system shown in fig. 1 and a schematic structural diagram of the indoor unit in the multi-split air conditioning system shown in fig. 2.
The multi-split air conditioner shown in fig. 1 includes two parts of an outdoor unit 1 and an outdoor unit 2, wherein the components in the outdoor unit 1 mainly include a compressor 11, an oil separator 12, a one-way valve 13, a four-way reversing valve 14, a main electronic expansion valve 16, an outdoor heat exchanger 15 and a gas-liquid separator 17. In the indoor unit 2 shown in fig. 2, a gas pipe temperature sensor 23 is connected to a refrigerant inlet of the indoor heat exchanger 21, and a liquid pipe temperature sensor 24 and an indoor unit electronic expansion valve 25 are connected to a refrigerant outlet of the indoor heat exchanger 21. Further, the indoor unit 2 is provided with an indoor fan 22 that enhances heat exchange with the indoor environment by the indoor heat exchanger 21, and an indoor temperature sensor 26 that detects the temperature of the indoor environment.
Fig. 1 and 2 also show the flow path of the refrigerant in the multi-split heating mode, that is, the refrigerant flows out from the exhaust port of the compressor 11, passes through the oil separator 12, the check valve 13, the four-way reversing valve 14, the air pipe stop valve 18, the indoor heat exchanger 21 of the indoor unit 2, the indoor electronic expansion valve 25, the liquid pipe stop valve 19, the main electronic expansion valve 16, the outdoor heat exchanger 15, the four-way reversing valve 14, the gas-liquid separator 17, and finally returns to the suction port of the compressor 11.
The multi-split air conditioner shown in fig. 1 includes an outdoor unit 1 and three indoor units 2. In the present embodiment, the indoor fans 22 of two indoor units are turned on to be in a normal heating state, and the indoor fan 22 of one indoor unit is turned off to be in a state to be heated.
Example 1
When the control method for the electronic expansion valve of the internal unit in the multi-split air conditioning system provided by the embodiment is used, the indoor fan of the indoor unit equipped with the electronic expansion valve of the internal unit is in a closed state, that is, the indoor unit is in a state to be heated, and the control method comprises the following steps:
s1, acquiring the current saturated condensing temperature P of the indoor unitd_tAnd the current outlet refrigerant temperature TC11(n)。
For example, the saturation temperature of the refrigerant condensed from gas to liquid under a certain pressure condition in the condenser is referred to as the condensing temperature, and the corresponding pressure is referred to as the condensing pressure. The condensing temperature is high or low depending on the ambient conditions, and the discharge temperature and pressure allowed by the compressor. Saturated condensing temperature Pd_tThe refrigerant has a temperature in a liquid and gaseous dynamic balance state, namely a saturated state, and the temperatures of the liquid refrigerant and the gaseous refrigerant are equal when the refrigerant is in a saturated condensation state. At the same time, saturated condensing temperature Pd_tThe refrigerant thermal properties can be looked up from the pressure gauge reading of the condenser (i.e., the indoor heat exchanger in the indoor unit in the multi-split air conditioning system). In addition, the current outlet refrigerant temperature TC11(n) may be obtained by sensing by the fluid line temperature sensor 24.
S2 based on parameter Pd_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the internal machine electronic expansion valve, and controlling the opening degree of the internal machine electronic expansion valve according to the parameter delta P (n).
For example, the minimum flow opening degree needs to be maintained for a preset stable time before the internal machine electronic expansion valve is opened, and then adjustment is performed; in the process of adjusting the internal machine electronic expansion valve, the parameter delta P (n) needs to be determined again at intervals of preset updating time so as to control the opening degree of the internal machine electronic expansion valve. So as to ensure the stable, reliable and accurate control of the internal electronic expansion valve.
Further, taking a direct-acting 500-pls expansion valve as an example, when the indoor unit is in a heating standby state, the opening degree of the internal electronic expansion valve is set to a value of 12pls, and after a time T1 when the internal electronic expansion valve is in a closed state, for example, T1 is 5min, the opening degree of the internal electronic expansion valve is set to a minimum flow opening degree B, that is, an opening point at which the expansion valve starts to have a flow, and B is set to 15 pls. Subsequently, the adjustment is carried out on the basis of the minimum flow opening B. Data is retrieved at regular intervals T and it is determined how the internal electronic expansion valve is adjusted, for example T may be set to a value between 1 and 5 min. It is essentially necessary to perform steps S1 and S2 of embodiment 1 at regular intervals T.
Meanwhile, in step S2, if Δ p (n) determined is 1 and the opening degree of the internal electronic expansion valve adjusted last time has reached the maximum value, the opening degree of the internal electronic expansion valve is kept unchanged; and if the determined delta P (n) is equal to-1 and the internal machine electronic expansion valve is in the closed state after the last adjustment, continuing to maintain the closed state of the internal machine electronic expansion valve.
As a preferred implementation manner of the foregoing control method provided in this embodiment, step S2 specifically includes:
s21, calculating the current supercooling degree Subcool of the indoor unit as Pd_t-TC11(n)；
S211, determining the current opening degree regulating quantity delta P (n) of the internal machine electronic expansion valve based on the parameter Subcool.
As a preferred implementation manner of the foregoing control method provided in this embodiment, step S211 specifically includes:
s2111, comparing the parameter Subcool with a first supercooling degree threshold value and a second supercooling degree threshold value; wherein the first supercooling degree threshold value is smaller than the second supercooling degree threshold value. For example, the first subcooling degree threshold value may be 3 ℃ and the second subcooling degree threshold value may be 8 ℃.
S2112, if Subcool is less than or equal to the first subcooling degree threshold value, Δ p (n) is-1, that is, the current subcooling degree Subcool needs to be increased by decreasing the internal unit electronic expansion valve by one opening value; if the sub cool is greater than or equal to the second subcooling degree threshold value, Δ p (n) is equal to 1, that is, the current subcooling degree of the sub cool needs to be reduced by increasing the internal unit electronic expansion valve by an opening value; if the sub-cool degree is greater than the first sub-cool degree threshold value and smaller than the second sub-cool degree threshold value, Δ p (n) is equal to 0, that is, the opening degree of the internal machine electronic expansion valve needs to be kept unchanged, that is, the current sub-cool degree of the internal machine sub-cool degree meets the requirement at this time.
As a preferred implementation of the foregoing control method provided in this embodiment, the control method further includes: acquiring the current indoor temperature; and stopping controlling the internal electronic expansion valve according to the control method after the current indoor temperature is higher than the set normal operating temperature and the indoor fan is in an open state. That is, the control method of the internal unit electronic expansion valve of the present embodiment is directed only to the internal unit that is in the state to be heated.
According to the control method of the electronic expansion valve of the indoor unit in the multi-split air-conditioning system, the current supercooling degree of the indoor unit is determined based on the current saturated condensing temperature of the indoor unit and the current outlet refrigerant temperature, and the current supercooling degree of the indoor unit is in the normal range between the first supercooling degree threshold value and the second supercooling degree threshold value by adjusting the electronic expansion valve of the indoor unit, so that the purposes of maintaining the stability and the operation energy efficiency of the air-conditioning system and preventing the noise of the refrigerant can be basically achieved.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
Practice ofExample 2
When the control method for the electronic expansion valve of the internal unit in the multi-split air conditioning system provided by the embodiment is used, the indoor fan of the indoor unit equipped with the electronic expansion valve of the internal unit is in a closed state, that is, the indoor unit is in a state to be heated, and the control method comprises the following steps:
s1, acquiring the current saturated condensing temperature P of the indoor unitd_tAnd the current outlet refrigerant temperature TC11(n)。
For example, the saturation temperature of the refrigerant condensed from gas to liquid under a certain pressure condition in the condenser is referred to as the condensing temperature, and the corresponding pressure is referred to as the condensing pressure. The condensing temperature is high or low depending on the ambient conditions, and the discharge temperature and pressure allowed by the compressor. Saturated condensing temperature Pd_tThe refrigerant has a temperature in a liquid and gaseous dynamic balance state, namely a saturated state, and the temperatures of the liquid refrigerant and the gaseous refrigerant are equal when the refrigerant is in a saturated condensation state. At the same time, saturated condensing temperature Pd_tThe refrigerant thermal properties can be looked up from the pressure gauge reading of the condenser (i.e., the indoor heat exchanger in the indoor unit in the multi-split air conditioning system). In addition, the current outlet refrigerant temperature TC11(n) may be obtained by sensing by the fluid line temperature sensor 24.
S2 based on parameter Pd_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the internal machine electronic expansion valve, and controlling the opening degree of the internal machine electronic expansion valve according to the parameter delta P (n).
For example, the minimum flow opening degree needs to be maintained for a preset stable time before the internal machine electronic expansion valve is opened, and then adjustment is performed; in the process of adjusting the internal machine electronic expansion valve, the parameter delta P (n) needs to be determined again at intervals of preset updating time so as to control the opening degree of the internal machine electronic expansion valve. So as to ensure the stable, reliable and accurate control of the internal electronic expansion valve.
Further, taking a direct-acting 500-pls expansion valve as an example, when the indoor unit is in a heating standby state, the opening degree of the internal electronic expansion valve is set to a value of 12pls, and after a time T1 when the internal electronic expansion valve is in a closed state, for example, T1 is 5min, the opening degree of the internal electronic expansion valve is set to a minimum flow opening degree B, that is, an opening point at which the expansion valve starts to have a flow, and B is set to 15 pls. Subsequently, the adjustment is carried out on the basis of the minimum flow opening B. Data is retrieved at regular intervals T and it is determined how the internal electromechanical electronic expansion valve is adjusted, for example T may be set to a value between 1-5 min. It is essentially necessary to perform steps S1 and S2 of embodiment 1 at regular intervals T.
Meanwhile, in step S2, if Δ p (n) determined is 1 and the opening degree of the internal electronic expansion valve adjusted last time has reached the maximum value, the opening degree of the internal electronic expansion valve is kept unchanged; and if the determined delta P (n) is equal to-1 and the internal machine electronic expansion valve is in the closed state after the last adjustment, continuing to maintain the closed state of the internal machine electronic expansion valve.
As a preferred implementation manner of the foregoing control method provided in this embodiment, step S2 specifically includes:
s21, calculating the current supercooling degree Subcool of the indoor unit as Pd_t-TC11(n)。
S212, determining the current opening degree regulating quantity delta P (n) of the internal machine electronic expansion valve based on the parameter Subcool.
As a preferred implementation manner of the foregoing control method provided in this embodiment, step S212 specifically includes:
s2121, obtaining the last opening degree adjustment quantity delta P (n-1) of the electronic expansion valve of the internal machine. It should be noted that the previous opening degree adjustment amount Δ P (n-1) of the internal machine electronic expansion valve needs to be recorded after the previous adjustment, and is used as a basis for determining the current opening degree adjustment amount Δ P (n).
S2122, obtaining the outlet refrigerant temperature T of the indoor unit before the last adjustment of the electronic expansion valve of the indoor unitC11(n-1). It should be noted that the outlet refrigerant temperature T according to the last opening adjustment of the electronic expansion valve of the internal unitC11(n-1) is recorded as a basis for determining the current opening degree adjustment amount Δ p (n).
S2123, calculating the variation Subchg1 of the outlet refrigerant temperature of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unit, wherein Subchg1 is TC11(n)-TC11(n-1). The parameter Subchg1 can reflect the last adjustment effect of the electronic expansion valve of the internal machine, so that the electronic expansion valve of the internal machine can be more accurately adjusted by combining the parameter Subchg1And (6) adjusting.
S2124, determining a parameter Subchg corresponding to the current supercooling degree Subcool based on a first mapping relation between the parameter Subcool and a preset variation Subchg of the outlet refrigerant temperature. As shown in table 1, when Subcool > 10, the corresponding parameter subhg is 0, when 2.5 < Subcool < 5, the corresponding parameter subhg is 0.5, when 5 < Subcool < 7.5, the corresponding parameter subhg is 1.2, when 7.5 < Subcool < 10, the corresponding parameter subhg is 0, and when Subcool > 10, the corresponding parameter subhg is 0.
S2125, compare the parameter Subchg1 with the parameter Subchg. As shown in Table 1, when Subcool > 10, the corresponding parameter Subchg is 0, and the parameter Subchg1 needs to be compared with 0. When subcylinder > 10 and subbcg 1 > 0, the secondary opening degree adjustment amount Δ p (n) is 0, i.e., no adjustment is required for the internal machine electronic expansion valve. In other words, when subcylinder > 10, if subcylinder 1 > 0, it indicates that the current outlet refrigerant temperature TC11(n) is changing towards the expected trend, and this time, the adjustment amount of the opening degree of the electronic expansion valve of the internal machine needs to be determined again in one cycle without adjusting the electronic expansion valve of the internal machine.
S2126, determining the current opening degree adjustment amount Δ P (n) of the internal machine electronic expansion valve based on the comparison result of the parameter subbchg 1 and the parameter subbchg, the parameter subboot and Δ P (n-1).
Illustratively, step S2126 may be implemented by looking up table 1. Note that the control principle of the internal unit electronic expansion valve in step S2126 includes: when the parameter subcylinder is in a proper range (approximately between 8 ℃ and 10 ℃ in table 1 for example), the refrigerant is ensured not to generate turbulent flow of evaporation and condensation, so that the purposes of maintaining the stability and the operation energy efficiency of the air conditioning system and preventing the noise of the refrigerant are achieved. Therefore, the goal of electronic expansion valve regulation is to maintain the parameter, Subcool, within this appropriate range.
As a preferred implementation manner of the control method provided in this embodiment, step S2126 specifically includes: when the parameter Subcool is greater than the maximum value (e.g., 10 ℃) for the expected supercooling degree, if Subcool 1 > Subcool, Δ p (n) is 0; if Subchg 1. ltoreq.Subchg, Δ P (n) ≧ 0.
It can be understood that, when the parameter Subcool is too large (for example, Subcool > 10 ℃), the parameter Subcool needs to be adjusted to be smaller by increasing the opening degree of the electronic expansion valve of the indoor unit, that is, the temperature of the outlet refrigerant of the indoor unit is increased. Referring to the situation that Subcool is greater than 10 in Table 1, when Subchg1 is greater than 0, it is indicated that the trend of the change in the temperature of the outlet refrigerant of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unit meets the expected requirement, and at this time, the electronic expansion valve of the indoor unit is not adjusted first, and further determination is needed according to the judgment result of the adjustment timing of the electronic expansion valve of the indoor unit in the next period, so that the adjustment of the electronic expansion valve of the indoor unit can be more accurate.
TABLE 1 look-up table for current opening degree regulating quantity delta P (n) of electronic expansion valve in machine
Figure BDA0003065257860000111
With continued reference to the case of subcylinder > 10 in table 1, when subcylinder > 10, it is necessary to decrease the parameter subcylinder, that is, increase subbcg 1, and when subbcg 1 < 0, it is necessary to determine the parameter Δ P (n) in combination with the parameter Δ P (n-1), in this process, the opening of the internal electronic expansion valve should be increased, but if the opening of the internal electronic expansion valve has been increased by Δ P (n-1) ═ 1 last time, because the parameter subcylinder distance is greater at this time, the opening of the internal electronic expansion valve may be increased continuously, and even if Δ P (n) — 2, if the opening of the internal electronic expansion valve has not changed last time, the opening of the internal electronic expansion valve needs to be increased continuously this time.
As a preferred implementation manner of the control method provided in this embodiment, step S2126 specifically includes: when the parameter Subcool is smaller than the minimum value (for example, 8 ℃) for setting the expected supercooling degree, if subbg 1 < subbg, Δ p (n) is 0; if Subchg1 is greater than or equal to Subchg, Δ P (n) is less than or equal to 0.
It can be understood that when the parameter Subcool is too small, the parameter Subcool needs to be adjusted larger by decreasing the opening degree of the electronic expansion valve of the indoor unit, that is, the outlet refrigerant temperature of the indoor unit is decreased. Referring to the case of subcylinder ≦ 2.5 in table 1, where subcylinder is 0 and subcylinder 1 ≦ 0, it indicates that the trend of the temperature change of the outlet refrigerant of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unit is in accordance with the expected requirement, and at this time, the electronic expansion valve of the indoor unit may not be adjusted first, and further determination is needed according to the determination result of the adjustment timing of the electronic expansion valve of the indoor unit next time, so that the adjustment of the electronic expansion valve of the indoor unit may be more accurate.
In summary, with continued reference to the case where subcylinder < 2.5 in table 1, the result of the internal electronic expansion valve tends to decrease according to the range of subcylinder, and the result of comparing the parameter subcylinder 1 with the parameter subcylinder can preliminarily determine whether the opening degree of the internal electronic expansion valve needs to decrease; if the opening degree of the internal machine electronic expansion valve needs to be reduced (namely, when Subchg1 is greater than or equal to 0) preliminarily, except that when Subchg1 is equal to 0 and the opening degree of the internal machine electronic expansion valve is reduced for the last time, operation delta P (n) is not needed to be equal to 0 temporarily, and the next period needs to be waited for determination, the operation delta P (n) of the internal machine electronic expansion valve which is reduced continuously is needed in other cases, and is less than 0.
It can be understood that, in the control method of the electronic expansion valve of the indoor unit in the multi-split air-conditioning system provided in this embodiment, it is determined that the electronic expansion valve of the indoor unit has a trend of increasing or decreasing according to the current supercooling degree Subcool of the indoor unit, and then it is preliminarily determined whether the electronic expansion valve of the indoor unit needs to be operated according to the variation amount Subcool 1 of the outlet refrigerant temperature of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unit, if the last electronic expansion valve of the indoor unit has operated according to the determined trend, it is determined whether the electronic expansion valve of the indoor unit needs to be adjusted according to the deviation of the current supercooling degree Subcool from the expected supercooling degree range, if the deviation is large, the adjustment needs to be continued, and if the deviation is small, the determination can be performed again in the next cycle. Therefore, in the embodiment, the current opening adjustment amount Δ p (n) of the internal electronic expansion valve is determined by integrating the above factors, so that the internal electronic expansion valve can be adjusted timely and accurately and frequent adjustment can be avoided. Therefore, the purpose of maintaining the stability and the operation energy efficiency of the air conditioning system and preventing the refrigerant noise can be more reliably realized.
As a preferred implementation of the foregoing control method provided in this embodiment, the control method further includes: acquiring the current indoor temperature; and stopping controlling the internal electronic expansion valve according to the control method after the current indoor temperature is higher than the set normal operating temperature and the indoor fan is in an open state.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
Example 3
When the control method for the electronic expansion valve of the internal unit in the multi-split air conditioning system provided by the embodiment is used, the indoor fan of the indoor unit equipped with the electronic expansion valve of the internal unit is in a closed state, that is, the indoor unit is in a state to be heated, and the control method comprises the following steps:
s1, acquiring the current saturated condensing temperature P of the indoor unitd_tAnd the current outlet refrigerant temperature TC11(n)。
For example, the saturation temperature of the refrigerant condensed from gas to liquid under a certain pressure condition in the condenser is referred to as the condensing temperature, and the corresponding pressure is referred to as the condensing pressure. The condensing temperature is high or low depending on the ambient conditions, and the discharge temperature and pressure allowed by the compressor. Saturated condensing temperature Pd_tThe refrigerant has a temperature in a liquid and gaseous dynamic balance state, namely a saturated state, and the temperatures of the liquid refrigerant and the gaseous refrigerant are equal when the refrigerant is in a saturated condensation state. At the same time, saturated condensing temperature Pd_tThe refrigerant thermal properties can be looked up from the pressure gauge reading of the condenser (i.e., the indoor heat exchanger in the indoor unit in the multi-split air conditioning system). In addition, the current outlet refrigerant temperature TC11(n) may be obtained by sensing by the fluid line temperature sensor 24.
S2 based on parameter Pd_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the internal machine electronic expansion valve, and performing internal machine electronic expansion according to the parameter delta P (n)The opening degree of the sub-expansion valve is controlled.
For example, the minimum flow opening degree needs to be maintained for a preset stable time before the internal machine electronic expansion valve is opened, and then adjustment is performed; in the process of adjusting the internal machine electronic expansion valve, the parameter delta P (n) needs to be determined again at intervals of preset updating time so as to control the opening degree of the internal machine electronic expansion valve. So as to ensure the stable, reliable and accurate control of the internal electronic expansion valve.
Further, taking a direct-acting 500-pls expansion valve as an example, when the indoor unit is in a heating standby state, the opening degree of the internal electronic expansion valve is set to a value of 12pls, and after a time T1 when the internal electronic expansion valve is in a closed state, for example, T1 is 5min, the opening degree of the internal electronic expansion valve is set to a minimum flow opening degree B, that is, an opening point at which the expansion valve starts to have a flow, and B is set to 15 pls. Subsequently, the adjustment is carried out on the basis of the minimum flow opening B. Data is retrieved at regular intervals T and it is determined how the internal electronic expansion valve is adjusted, for example T may be set to a value between 1 and 5 min. It is essentially necessary to perform steps S1 and S2 of embodiment 1 at regular intervals T.
Meanwhile, in step S2, if Δ p (n) determined is 1 and the opening degree of the internal electronic expansion valve adjusted last time has reached the maximum value, the opening degree of the internal electronic expansion valve is kept unchanged; and if the determined delta P (n) is equal to-1 and the internal machine electronic expansion valve is in the closed state after the last adjustment, continuing to maintain the closed state of the internal machine electronic expansion valve.
As a preferred implementation manner of the foregoing control method provided in this embodiment, step S2 specifically includes:
s221, obtaining the outlet refrigerant temperature T of the indoor unit before the last adjustment of the electronic expansion valve of the indoor unitC11(n-1). It should be noted that the outlet refrigerant temperature T according to the last opening adjustment of the electronic expansion valve of the internal unitC11(n-1) is recorded as a basis for determining the current opening degree adjustment amount Δ p (n).
S222, calculating the variation of the outlet refrigerant temperature of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unitSubchg1，Subchg1＝TC11(n)-TC11(n-1). The parameter subbchg 1 can reflect the last adjustment effect of the electronic expansion valve of the internal machine, so that the electronic expansion valve of the internal machine can be adjusted more accurately by combining the parameter subbchg 1.
S223, based on the parameter Pd_tAnd obtaining the current Target outlet refrigerant temperature Target through a second mapping relation with the Target outlet refrigerant temperature Target of the indoor unit. As shown in Table 2, the range of discharge pressure Pd of the compressor corresponds to the current saturated condensing temperature Pd_tIn the range of and at the current saturated condensing temperature Pd_tWithin the range of the current outlet refrigerant temperature TC11(n) if the Target outlet refrigerant temperature Target and the allowable vicinity are reached, the object of the present invention to maintain the stability and the operation energy efficiency of the air conditioning system and to prevent the refrigerant noise can be achieved. For example, when the discharge pressure of the compressor is in the range of 1.64MPa < Pd.ltoreq.1.80 MPa in Table 2, the corresponding condensation temperature Pd_tThe range is more than 27 ℃ and less than or equal to 30 ℃, the Target outlet refrigerant temperature Target is 23 ℃, and the current supercooling degree Subcool of the indoor unit can be Pd_t-TC11(n) is within a suitable range.
S224, comparing the parameter TC11(n) and the magnitude of the parameter Target to determine a first opening degree adjustment amount f (T)C11) (ii) a Wherein, when TC11F (T) when (n) < TargetC11) 1, namely, the current outlet refrigerant temperature T needs to be increased by increasing the opening degree of the internal machine electronic expansion valveC11(n), enabling the Target outlet refrigerant temperature to reach Target, and enabling the current supercooling degree Subcool of the indoor unit to be in a proper range; when T isC11When (n) is equal to Target f (T)C11) When the supercooling degree is equal to 0, the current supercooling degree Subcool of the indoor unit is within the proper range; when T isC11(n) > Target f (T)C11) 1, namely, the current outlet refrigerant temperature T needs to be reduced by reducing the opening degree of the internal machine electronic expansion valveC11And (n), enabling the temperature to reach the Target outlet refrigerant temperature Target, and enabling the current supercooling degree Subcool of the indoor unit to be in a proper range.
S225, determining a second opening degree regulating quantity f (Subchg) based on the parameter Subchg11) (ii) a Wherein f (Subchg1) is 1 when Subchg1 < 0, f (Subchg1) is 0 when Subchg1 is 0, and f (Subchg1) is-1 when Subchg1 > 0. It is understood that the current outlet refrigerant temperature T is described as long as Subchg1 is not 0C11(n) is likely to be still in the continuous change, so it is also necessary to make the first opening degree adjustment amount f (T) determined in combination with the second opening degree adjustment amount f (subbcg 1)C11) Correction is made to obtain the final Δ p (n).
S226, the current opening degree adjustment amount of the internal machine electronic expansion valve is determined as Δ p (n) ═ f (T)C11)+f(Subchg1)。
As a preferable implementation of the above control method provided in this embodiment, regarding step S22, in the second mapping relationship, the parameter P isd_tRespectively corresponds to a parameter Target, and the parameter Target and the parameter Pd_tIs in positive correlation. As in Table 2, parameter Pd_tThe larger the end point value of the range is, the larger the current Target outlet refrigerant temperature Target corresponding to the range is, so that the purposes of maintaining the stability and the operation energy efficiency of the air conditioning system and preventing the noise of the refrigerant can be realized.
As a preferred implementation of the foregoing control method provided in this embodiment, the control method further includes: acquiring the current indoor temperature; and stopping controlling the internal electronic expansion valve according to the control method after the current indoor temperature is higher than the set normal operating temperature and the indoor fan is in an open state.
According to the control method of the electronic expansion valve of the indoor unit in the multi-split air-conditioning system, when an indoor fan of the indoor unit equipped with the electronic expansion valve of the indoor unit is in a closed state, the current opening degree adjustment quantity of the electronic expansion valve of the indoor unit is determined based on the current saturated condensation temperature and the current outlet refrigerant temperature of the indoor unit, and the electronic expansion valve of the indoor unit is controlled according to the comparison result of the current outlet refrigerant temperature and the current target outlet refrigerant temperature and the variation quantity of the outlet refrigerant temperature of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unit. It can be understood that different discharge pressures of the compressor have corresponding saturated condensing temperatures of the indoor unit, and the indoor unit can be in a better operation state when the outlet refrigerant temperature of the indoor unit is controlled to be the target outlet refrigerant temperature corresponding to the saturated condensing temperature by adjusting the electronic expansion valve of the indoor unit, so as to basically achieve the purposes of maintaining the stability and the operation energy efficiency of the air conditioning system and preventing the noise of the refrigerant.
TABLE 2 second mapping relation reference table
Figure BDA0003065257860000161
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
It should be understood by those skilled in the art that the control method of the electronic expansion valve of the indoor unit in the multi-split air conditioner provided in the present embodiment may be stored as a program in a computer-readable storage medium. The storage medium includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A control method for an indoor unit electronic expansion valve in a multi-split air conditioner is characterized in that an indoor fan of an indoor unit provided with the indoor unit electronic expansion valve is in a closed state, and the control method comprises the following steps:
obtaining the current saturated condensing temperature P of the indoor unitd_tAnd the current outlet refrigerant temperature TC11(n)；
Based on the parameter Pd_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the indoor unit electronic expansion valve, and controlling the opening degree of the indoor unit electronic expansion valve according to the parameter delta P (n).
2. The control method according to claim 1, wherein "based on parameter Pd_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the indoor unit electronic expansion valve, and controlling the opening degree of the indoor unit electronic expansion valve according to the parameter delta P (n), wherein the step comprises the following steps:
calculating the current supercooling degree Subcool of the indoor unit as Pd_t-TC11(n)；
And determining the current opening degree regulating quantity delta P (n) of the internal machine electronic expansion valve based on the parameter Subcool.
3. The control method according to claim 2, wherein the step of "determining the current opening degree adjustment amount Δ p (n) of the internal machine electronic expansion valve based on the parameter Subcool" includes:
comparing the parameter Subcool with a first supercooling degree threshold value and a second supercooling degree threshold value; wherein the first subcooling degree threshold value is less than the second subcooling degree threshold value;
Δ p (n) is-1 if Subcool is less than or equal to the first subcooling degree threshold; Δ p (n) is 1 if Subcool is greater than or equal to the second subcooling degree threshold; if Subcool is greater than the first subcooling threshold value and less than the second subcooling threshold value, Δ p (n) is 0.
4. The control method according to claim 2, wherein the step of "determining the current opening degree adjustment amount Δ p (n) of the inner machine electronic expansion valve based on the parameter Subcool" further comprises:
obtaining the last opening degree regulating quantity delta P (n-1) of the internal machine electronic expansion valve;
obtaining the outlet refrigerant temperature T of the indoor unit before the last adjustment of the electronic expansion valve of the indoor unitC11(n-1)；
Calculating the variation Subchg1 of the outlet refrigerant temperature of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unit, wherein Subchg1 is TC11(n)-TC11(n-1)；
Determining a parameter Subchg corresponding to the current supercooling degree Subcool based on a first mapping relation between the parameter Subcool and a preset variation Subchg of the outlet refrigerant temperature;
comparing the parameter Subchg1 with the parameter Subchg;
and jointly determining the current opening degree adjustment quantity delta P (n) of the internal machine electronic expansion valve based on the comparison result of the parameter Subchg1 and the parameter Subchg, the parameter Subcool and delta P (n-1).
5. The control method according to claim 4, wherein the step of "determining the current opening degree adjustment amount Δ P (n) of the inner unit electronic expansion valve based on the comparison result of the parameter Subchgl with the parameter Subchg, the parameters Subcool, and Δ P (n-1) collectively comprises: when the parameter Subcool is greater than the set maximum value of the expected subcooling degree,
Δ p (n) 0 if Subchg1 > Subchg; if Subchg 1. ltoreq.Subchg, Δ P (n) ≧ 0.
6. The control method according to claim 4, wherein the step of "determining the current opening degree adjustment amount Δ P (n) of the inner unit electronic expansion valve based on the comparison result of the parameter Subchg1 with the parameter Subchg, the parameter Subcool, and Δ P (n-1) collectively comprises: when the parameter Subcool is less than the minimum value set to the desired subcooling degree,
Δ p (n) 0 if Subchg1 < Subchg; if Subchg1 is greater than or equal to Subchg, Δ P (n) is less than or equal to 0.
7. The control method according to claim 1, wherein "based on parameter Pd_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the indoor unit electronic expansion valve, and controlling the opening degree of the indoor unit electronic expansion valve according to the parameter delta P (n), wherein the step comprises the following steps:
obtaining the outlet refrigerant temperature T of the indoor unit before the last adjustment of the electronic expansion valve of the indoor unitC11(n-1)；
Calculating the variation Subchg1 of the outlet refrigerant temperature of the indoor unit before and after the last adjustment of the electronic expansion valve of the indoor unit, wherein Subchg1 is TC11(n)-TC11(n-1)；
Based on the parameter Pd_tObtaining the current Target outlet refrigerant temperature Target through a second mapping relation between the Target outlet refrigerant temperature Target and the indoor unit;
comparison of the parameters TC11(n) and the magnitude of the parameter Target to determine a first opening degree adjustment amount f (T)C11) (ii) a Wherein, when TC11F (T) when (n) < TargetC11) When T is equal to 1C11When (n) is equal to Target f (T)C11) When T is equal to 0C11(n) > Target f (T)C11)＝-1；
Determining a second opening degree adjustment amount f (Subchg1) based on the parameter Subchg 1; wherein f (Subchg1) is 1 when Subchg1 < 0, f (Subchg1) is 0 when Subchg1 is 0, and f (Subchg1) is-1 when Subchg1 > 0;
determining the current opening degree adjustment quantity of the internal machine electronic expansion valve as delta P (n) f (TC)11)+f(Subchg1)。
8. The control method according to claim 7, characterized in that in the second mapping relationship, a parameter Pd_tRespectively corresponds to a parameter Target, and the parameter Target and the parameter Pd_tIs in positive correlation.
9. Control method according to claim 1, characterized in that "based on parameter P" ad_tAnd TC11(n) determining the current opening degree regulating quantity delta P (n) of the internal machine electronic expansion valve, and controlling the opening degree of the internal machine electronic expansion valve according to the parameter delta P (n):
the minimum flow opening degree is required to be kept for a preset stable time before the internal machine electronic expansion valve is opened, and then adjustment is carried out;
in the process of adjusting the internal machine electronic expansion valve, the parameter delta P (n) needs to be determined again at intervals of preset updating time so as to control the opening degree of the internal machine electronic expansion valve;
if the determined delta P (n) is 1 and the opening degree of the internal electronic expansion valve after the last adjustment reaches the maximum value, keeping the opening degree of the internal electronic expansion valve unchanged;
and if the determined delta P (n) is equal to-1 and the internal machine electronic expansion valve is in a closed state after being adjusted last time, continuing to maintain the closed state of the internal machine electronic expansion valve.
10. The control method according to any one of claims 1 to 9, characterized by further comprising:
acquiring the current indoor temperature;
and stopping controlling the electronic expansion valve of the internal machine according to the control method after the current indoor temperature is higher than the set normal operating temperature and the indoor fan is in an open state.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113883678A (en) * 2021-09-26 2022-01-04 青岛海尔中央空调有限公司 Noise control method for air conditioner and air conditioner
CN114061107A (en) * 2021-12-27 2022-02-18 上海美控智慧建筑有限公司 Control method and system of multi-split air conditioning system
CN114754467A (en) * 2022-02-28 2022-07-15 青岛海尔空调电子有限公司 Control method of multi-split system
WO2022237912A1 (en) * 2021-05-13 2022-11-17 青岛海尔空调电子有限公司 Control method of indoor unit electronic expansion valve in multi-split system
WO2023221331A1 (en) * 2022-05-18 2023-11-23 美的集团武汉暖通设备有限公司 Multi-split air conditioner control method, multi-split air conditioner, and storage medium
WO2024040915A1 (en) * 2022-08-22 2024-02-29 青岛海信日立空调系统有限公司 Air conditioner

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001248920A (en) * 2000-03-06 2001-09-14 Mitsubishi Electric Corp Controller for refrigeration circuit
CN101498534A (en) * 2008-12-08 2009-08-05 天津大学 Multi-target intelligent control method for electronic expansion valve of refrigeration air conditioner heat pump system
CN105864984A (en) * 2016-04-27 2016-08-17 广东美的暖通设备有限公司 Adjusting method and device for indoor unit electronic expansion valve

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05106929A (en) * 1991-04-24 1993-04-27 Matsushita Refrig Co Ltd Space heating controller for multichamber air conditioner
US5701753A (en) * 1995-06-26 1997-12-30 Nippondenso Co., Ltd. Air conditioning apparatus
JP5448566B2 (en) * 2009-05-21 2014-03-19 三菱重工業株式会社 Multi air conditioner
CN106352611B (en) * 2016-08-26 2018-11-20 芜湖美智空调设备有限公司 Multi-split air conditioner and its control method for electronic expansion valve
CN110094857B (en) * 2019-04-11 2021-03-12 海信（山东）空调有限公司 Control method and device of air conditioner electronic expansion valve, computer product and air conditioner
CN111878964B (en) * 2020-07-27 2022-02-08 宁波奥克斯电气股份有限公司 Control method and device of electronic expansion valve, air conditioner and storage medium
CN113418275B (en) * 2021-05-13 2023-04-25 青岛海尔空调电子有限公司 Control method for electronic expansion valve of internal machine in multi-split air conditioner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001248920A (en) * 2000-03-06 2001-09-14 Mitsubishi Electric Corp Controller for refrigeration circuit
CN101498534A (en) * 2008-12-08 2009-08-05 天津大学 Multi-target intelligent control method for electronic expansion valve of refrigeration air conditioner heat pump system
CN105864984A (en) * 2016-04-27 2016-08-17 广东美的暖通设备有限公司 Adjusting method and device for indoor unit electronic expansion valve

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022237912A1 (en) * 2021-05-13 2022-11-17 青岛海尔空调电子有限公司 Control method of indoor unit electronic expansion valve in multi-split system
CN113883678A (en) * 2021-09-26 2022-01-04 青岛海尔中央空调有限公司 Noise control method for air conditioner and air conditioner
CN114061107A (en) * 2021-12-27 2022-02-18 上海美控智慧建筑有限公司 Control method and system of multi-split air conditioning system
CN114061107B (en) * 2021-12-27 2023-11-28 上海美控智慧建筑有限公司 Control method and system of multi-split air conditioning system
CN114754467A (en) * 2022-02-28 2022-07-15 青岛海尔空调电子有限公司 Control method of multi-split system
WO2023221331A1 (en) * 2022-05-18 2023-11-23 美的集团武汉暖通设备有限公司 Multi-split air conditioner control method, multi-split air conditioner, and storage medium
WO2024040915A1 (en) * 2022-08-22 2024-02-29 青岛海信日立空调系统有限公司 Air conditioner

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