CN114811860B - Control method of multi-split air conditioning system and multi-split air conditioning system - Google Patents
Control method of multi-split air conditioning system and multi-split air conditioning system Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000033228 biological regulation Effects 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 description 29
- 239000007788 liquid Substances 0.000 description 22
- 239000003507 refrigerant Substances 0.000 description 10
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
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- 238000004134 energy conservation Methods 0.000 description 1
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Classifications
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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
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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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
- F24F11/62—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
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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
- F24F11/70—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
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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
- F24F11/70—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
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- 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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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Signal Processing (AREA)
- Thermal Sciences (AREA)
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- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application discloses a control method of a multi-split air conditioning system and the multi-split air conditioning system, which are used for improving the operation reliability and the efficiency in the operation process of the multi-split air conditioning system. The control method comprises the following steps: acquiring the current outdoor environment temperature, the current startup parameters of the indoor unit and the current condensing pressure of the running outdoor unit in the startup operation process of the indoor unit; when the current outdoor environment temperature and the current indoor unit startup parameters meet preset opening adjustment conditions, controlling an expansion valve of the startup indoor unit to operate at a preset first opening so as to adjust the exhaust temperature of an air conditioning system; when the current condensing pressure meets the preset pressure condition, the rotating speed of the fan of the running outdoor unit is controlled according to the current outdoor environment temperature, the current startup parameter of the indoor unit and a preset rotating speed adjusting strategy so as to adjust the condensing pressure of the air conditioning system.
Description
Technical Field
The application belongs to the technical field of air conditioning, in particular to an air conditioning system, and more particularly relates to a multi-split air conditioning system control method and a multi-split air conditioning system.
Background
The multi-split air conditioning system generally adopts a mode of connecting a plurality of modules in parallel, has the advantages of effective energy conservation, convenient maintenance, low operation cost and the like, but is limited by installation structures such as long pipelines, large drop and the like, has difficult oil return, and is easy to cause oil bias among a plurality of compressors. Especially under low temperature working condition, the oil temperature is low, lubricity is poor, and the oil return problem is more likely to occur. Moreover, under the low-temperature working condition, the refrigerant is more in liquid state, and the condition that liquid is too much to cause liquid impact of the compressor is easy to occur.
In the prior art, aiming at the oil return and liquid return problems of a multi-split air conditioning system, the electronic expansion valve is set to be smaller in initial valve opening degree in the starting-up stage of the air conditioning system, so that the refrigerant entering the compressor is reduced to a large extent, the system circulation pressure difference and the oil temperature superheat degree are quickly established, and the reliability of the oil return and liquid return in the starting-up stage is improved. However, during the operation of the air conditioning system, if the heat exchange effect of the outdoor unit is poor, the abnormal condition of low exhaust temperature is easy to occur after oil return, so that the service life of the compressor is shortened, the energy consumption of the external unit is increased, and the reliable and efficient operation performance of the air conditioning system is affected.
Disclosure of Invention
The application aims to provide a control method of a multi-split air conditioning system, which improves the operation reliability and the efficiency in the operation process of the multi-split air conditioning system by increasing the exhaust temperature of the air conditioning system.
In order to achieve the aim of the application, the application is realized by adopting the following technical scheme:
a control method of a multi-split air conditioning system comprises the following steps:
acquiring the current outdoor environment temperature, the current startup parameters of the indoor unit and the current condensing pressure of the running outdoor unit in the startup operation process of the indoor unit;
when the current outdoor environment temperature and the current indoor unit startup parameters meet preset opening adjustment conditions, controlling an expansion valve of the startup indoor unit to operate at a preset first opening so as to adjust the exhaust temperature of an air conditioning system;
when the current condensing pressure meets the preset pressure condition, the rotating speed of the fan of the running outdoor unit is controlled according to the current outdoor environment temperature, the current startup parameter of the indoor unit and a preset rotating speed adjusting strategy so as to adjust the condensing pressure of the air conditioning system.
In some embodiments of the present application, the current startup parameter of the internal machine is a current startup probability of the internal machine;
the preset opening adjustment condition includes:
the current internal machine starting rate is smaller than a first starting rate threshold value;
or, the current outdoor environment temperature is less than a first outdoor environment temperature threshold.
In some embodiments of the application, the control method further comprises:
when the expansion valve runs at the preset first opening degree, the opening degree of the expansion valve is controlled according to a known automatic opening degree adjustment strategy when a preset opening degree jump condition is met.
In some embodiments of the application, the control method further comprises:
and when the current outdoor environment temperature and the current startup parameters of the internal unit do not meet the preset opening adjustment conditions, controlling the opening of the expansion valve according to the automatic opening adjustment strategy.
In some embodiments of the present application, the current internal machine startup parameter is the current internal machine startup probability;
the preset opening jump condition comprises any one of the following conditions:
the expansion valve is operated under the condition that the duration time of the preset first opening reaches a first time threshold value;
the expansion valve is operated according to the preset first opening degree, the operation duration reaches a second time threshold value, and the minimum exhaust superheat degree of the outdoor unit is greater than a first exhaust superheat degree threshold value;
the expansion valve is operated according to the preset first opening degree, the operation duration reaches a third time threshold value, and the maximum exhaust superheat degree of the outdoor unit is greater than a second exhaust superheat degree threshold value;
and the current internal machine starting rate is greater than a second starting rate threshold value.
In some embodiments of the application, the control method further comprises:
after the indoor unit is started, firstly controlling the expansion valve of the indoor unit to operate at a preset initial opening, and then executing the process of acquiring the current outdoor environment temperature, the current indoor unit starting parameter and the current condensing pressure of the operating outdoor unit.
In some embodiments of the application, the preset pressure conditions include: the current condensing pressure is smaller than a first condensing pressure threshold value, or the current condensing pressure is larger than a second condensing pressure threshold value;
controlling the rotating speed of the fan of the running outdoor unit according to the current outdoor environment temperature, the current internal unit start-up and a preset rotating speed adjusting strategy, and comprising:
when the current condensing pressure is smaller than the first condensing pressure threshold value and the current outdoor environment temperature and the current startup parameter of the internal machine meet a first state, controlling the rotating speed of a fan of the running outdoor machine to reduce according to a first regulation strategy;
when the current condensing pressure is smaller than the first condensing pressure threshold value and the current outdoor environment temperature and the current startup parameter of the internal machine do not meet the first state, controlling the rotating speed of a fan of the running outdoor machine to reduce according to a second regulation strategy; the speed reduction rate according to the second adjustment strategy is not greater than the speed reduction rate according to the first adjustment strategy;
when the current condensing pressure is larger than the second condensing pressure threshold value and the current outdoor environment temperature and the current internal machine starting parameter meet the first state, controlling the rotating speed of a fan of the running outdoor machine to rise according to a third adjusting strategy;
when the current condensing pressure is larger than the second condensing pressure threshold value and the current outdoor environment temperature and the current startup parameter of the internal machine do not meet the first state, controlling the rotating speed of a fan of the running outdoor machine to rise according to a fourth regulation strategy; the rate of rise of the speed according to the fourth adjustment strategy is not greater than the rate of rise of the speed according to the third adjustment strategy.
In some embodiments of the application, the control method further comprises:
when the current condensing pressure is not smaller than the first condensing pressure threshold and smaller than a third condensing pressure threshold, controlling the rotating speed of the fan of the running outdoor unit to reduce according to a fifth adjusting strategy; the speed reduction rate according to the fifth adjustment strategy is not greater than the speed reduction rate according to the second adjustment strategy;
when the current condensing pressure is not smaller than the third condensing pressure threshold and smaller than the fourth condensing pressure threshold, controlling the rotating speed of the fan of the running outdoor unit to be unchanged;
when the current condensing pressure is not smaller than the fourth condensing pressure threshold and is not larger than the second condensing pressure threshold, controlling the rotating speed of the fan of the outdoor unit to rise according to a sixth adjusting strategy; the rate of rise of the rise according to the sixth adjustment strategy is not greater than the rate of rise of the rise according to the fourth adjustment strategy.
Another object of the present application is to provide a multi-split air conditioning system with high reliability and high efficiency, including a plurality of indoor units and a plurality of outdoor units, further including: and the controller is configured to execute the multi-split air conditioning system control method.
Still another object of the present application is to provide an electronic device, including a processor, a memory, and a computer program stored on the memory, where the processor is configured to execute the computer program to implement the above-mentioned control method of the multi-split air conditioning system.
Compared with the prior art, the application has the advantages and positive effects that:
according to the multi-split air conditioning system and the control method thereof, in the starting operation process of the indoor unit, the opening degree of the expansion valve of the indoor unit is controlled according to the outdoor environment temperature and the starting parameters of the indoor unit, so that the exhaust temperature of the air conditioner system is adjusted within a reasonable range, and the problems of low exhaust temperature fault, liquid impact on a compressor and the like caused by the fact that liquid refrigerant is quickly returned to the outdoor unit system are avoided; meanwhile, the fan rotating speed of the outdoor unit is regulated according to the condensing pressure, the outdoor environment temperature and the startup parameters of the indoor unit, so that the condensing pressure of the air conditioning system is regulated within a reasonable range, the circulating capacity and performance parameters of the refrigerant system are improved, the discharge amount of liquid refrigerant and oil after gas-liquid separation is regulated, the problems of liquid impact of a compressor and the like caused by low exhaust temperature faults and poor liquid return are further avoided, and the reliable and efficient operation of the air conditioning system is improved.
Other features and advantages of the present application will become apparent upon review of the detailed description of the application in conjunction with the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a control method of a multi-split air conditioning system according to a first embodiment of the present application;
FIG. 2 is a schematic flow chart of a control method of a multi-split air conditioning system according to a second embodiment of the present application;
FIG. 3 is a schematic flow chart of a third embodiment of a control method of a multi-split air conditioning system according to the present application;
fig. 4 is a schematic structural view of an embodiment of the electronic device of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples.
Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "first," "second," "third," "fourth," "fifth," "sixth," etc. may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a number" means one or more, and the meaning of "a number" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It should be noted that, the technical solutions of the embodiments of the present application may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the technical solutions are not combined, and are not within the scope of protection claimed by the present application.
Aiming at the current situation that an effective control means is lacking in the running process of the multi-split air conditioning system in the prior art to solve the problems of low exhaust temperature faults, poor liquid return and the like, the multi-split air conditioning system is creatively provided with the technical aim of controlling the opening degree of an expansion valve of an indoor unit according to the outdoor environment temperature and the startup parameters of the indoor unit, adjusting the fan rotating speed of the outdoor unit according to the condensing pressure, the outdoor environment temperature and the startup parameters of the indoor unit, avoiding the problems of compressor liquid impact and the like caused by the low exhaust temperature faults and the poor liquid return, and improving the reliable and efficient running of the multi-split air conditioning system.
Fig. 1 is a schematic flow chart of a control method of a multi-split air conditioning system according to a first embodiment of the present application. The multi-split air conditioner comprises a plurality of outdoor units and a plurality of indoor units.
As illustrated in fig. 1, this embodiment employs the following procedure to achieve control during operation of the multi-split air conditioning system.
Step 101: and in the starting-up operation process of the indoor unit, acquiring the current outdoor environment temperature, the current starting-up parameters of the indoor unit and the current condensing pressure of the running outdoor unit.
For a multi-split air conditioning system, generally, after the air conditioning system is started, oil return control is usually performed first, and an indoor unit does not operate. After the oil return is finished, the indoor unit is started to operate. This embodiment is directed to control performed during the startup operation of the indoor unit after the end of the oil return phase.
The current outdoor environment temperature is a real-time outdoor environment temperature obtained according to a set sampling frequency, and can be obtained through a temperature detection device arranged on the outdoor unit, or can be obtained from meteorological data through a network, or can be obtained by other means.
The current startup parameter of the internal machine is a parameter reflecting the indoor machine in the startup device in real time in the air conditioning system. In some embodiments, the current internal machine startup parameter is the current internal machine startup probability, and the ratio of the total capacity of all the current startup internal machines to the total capacity of all the internal machines in the multi-split air conditioning system is calculated. In other embodiments, the current internal machine startup rate is obtained by calculating a ratio of the number of all the current startup internal machines to the number of all the internal machines in the multi-split air conditioning system.
The current condensing pressure of the outdoor unit is obtained by setting a pressure detecting device at the condensing section of the refrigerant system to obtain the condensing pressure of the outdoor unit in the operating state according to the set sampling frequency.
Step 102: when the current outdoor environment temperature and the current indoor unit starting parameter meet the preset opening adjustment condition, controlling an expansion valve of the starting indoor unit to operate at a preset first opening; when the current condensing pressure meets the preset pressure condition, the rotating speed of a fan running the outdoor unit is controlled according to the current outdoor environment temperature, the current startup parameter of the indoor unit and a preset rotating speed adjusting strategy.
The setting principle of the preset opening adjustment condition is as follows: when the preset opening adjustment condition is satisfied, a low exhaust temperature failure of the air conditioner system is liable to occur.
In some embodiments, when the current startup parameter of the internal machine is the current startup probability of the internal machine, the preset opening adjustment condition includes: the current internal machine starting rate is smaller than a first starting rate threshold value; alternatively, the current outdoor ambient temperature is less than the first outer loop temperature threshold.
The first power-on rate threshold and the first external ring temperature threshold are both known values, and can be preset fixed values or dynamic variable values. In some embodiments, the first power-on threshold r1 is a fixed value, and r1=25%; the first external ring temperature threshold T1 is a fixed value, and t1=10℃.
The preset first opening is a known value, and is generally determined according to the structure of the multi-split air conditioning system, and the value principle is as follows: the expansion valve of the indoor unit operates at the preset first opening, so that the exhaust temperature of the air conditioning system can be increased, and the low exhaust temperature fault is avoided. For a determined multi-split air conditioning system, it is typically a fixed value. In some embodiments, the first opening p1=200pls is preset.
When the current outdoor environment temperature and the current indoor unit startup parameters meet the preset opening adjustment conditions, the low exhaust temperature fault of the air conditioner system is easy to occur. In this state, the expansion valve of the indoor unit is forcibly controlled to operate at a preset first opening degree so as to adjust the exhaust temperature of the air conditioning system to be within a reasonable range.
The setting principle of the preset pressure condition is as follows: when the preset pressure condition is met, the refrigerant circulation performance of the air conditioning system is poor, and the problems of low exhaust temperature failure, poor liquid return and the like are easy to occur.
In some embodiments, the preset pressure conditions include: the current condensing pressure is less than the first condensing pressure threshold or the current condensing pressure is greater than the second condensing pressure threshold.
The first condensing pressure threshold and the second condensing pressure threshold are both known values, and can be either preset fixed values or dynamic variable values. In some embodiments, the first condensing pressure threshold P d 1 is a fixed value, and P d 1=1.9 MPa; second condensing pressure threshold P d 2 is a fixed value, and P d 2=3.2MPa。
The preset rotating speed adjusting strategy at least comprises matching relations of different outdoor environment temperatures and rotating speeds of fans of the outdoor unit corresponding to the starting parameter states of the internal unit. When the current condensing pressure meets the preset pressure condition, the problems of low exhaust temperature fault, poor liquid return and the like are easy to occur. In this state, the rotational speed of the fan of the outdoor unit is controlled according to the current outdoor environment temperature, the current startup parameter of the indoor unit and the preset rotational speed adjustment strategy, so as to adjust the condensing pressure of the air conditioning system to be within a reasonable range.
In the embodiment, during the startup operation of the indoor unit, the opening degree of the expansion valve of the indoor unit is controlled according to the outdoor environment temperature and the startup parameters of the indoor unit so as to adjust the exhaust temperature of the air conditioner system within a reasonable range, and the problems of low exhaust temperature fault, liquid impact on the compressor and the like caused by the rapid return of the liquid refrigerant to the outdoor unit system are avoided. Meanwhile, the fan rotating speed of the outdoor unit is regulated according to the condensing pressure, the outdoor environment temperature and the startup parameters of the indoor unit, so that the condensing pressure of the air conditioning system is regulated within a reasonable range, the circulating capacity and performance parameters of the refrigerant system are improved, the discharge amount of liquid refrigerant and oil after gas-liquid separation is regulated, the problems of liquid impact of a compressor and the like caused by low exhaust temperature faults and poor liquid return are further avoided, and the reliable and efficient operation of the air conditioning system is improved.
Fig. 2 is a schematic flow chart of a control method of a multi-split air conditioning system according to a second embodiment of the present application. The multi-split air conditioner comprises a plurality of outdoor units and a plurality of indoor units.
As illustrated in fig. 2, this embodiment employs the following procedure to achieve control during operation of the multi-split air conditioning system.
Step 201: the indoor unit is started up to operate.
Step 202: and controlling the expansion valve of the startup indoor unit to operate at a preset initial opening.
The preset initial opening is a known value, and is generally determined according to the structure of the multi-split air conditioning system. Generally, the preset initial opening is an initial value smaller than the preset first opening, and the value principle is as follows: the expansion valve of the indoor unit operates at the preset initial opening, so that the exhaust temperature of the air conditioning system can be increased, and the low exhaust temperature fault is avoided. For a determined multi-split air conditioning system, it is typically a fixed value. In some embodiments, the initial opening p2=100 pls is preset.
After the indoor unit operates and before the current outdoor environment temperature and the current indoor unit starting parameter are obtained, firstly controlling an expansion valve of the indoor unit to start to operate at a preset initial opening, on one hand, increasing the exhaust temperature of an air conditioning system to avoid low exhaust temperature faults, and on the other hand, placing the opening of the expansion valve at an initial opening value close to the preset first opening to avoid unstable system operation caused by abrupt change of the opening when the expansion valve is directly changed from a smaller opening to a larger preset first opening.
Step 203: and acquiring the current outdoor environment temperature and the current startup parameters of the internal machine.
The current outdoor environment temperature, the meaning of the current indoor unit startup parameter, the acquisition method and the like are referred to in the corresponding description of the foregoing embodiments.
Step 204: judging whether a preset opening degree adjusting condition is met. If yes, go to step 205; otherwise, go to step 207.
Specifically, whether the current outdoor environment temperature and the current startup parameters of the internal machine meet preset opening adjustment conditions is judged, and different processing procedures are executed according to the judgment result. The setting principle of the preset opening adjustment condition, the setting of the specific condition, and the like are referred to the corresponding description of the foregoing embodiments.
Step 205: and controlling the expansion valve of the startup indoor unit to operate at a preset first opening.
When the current outdoor environment temperature and the current indoor unit startup parameters meet the preset opening adjustment conditions, the low exhaust temperature fault of the air conditioner system is easy to occur. In this state, the expansion valve of the indoor unit is forcibly controlled to operate at a preset first opening degree so as to raise the exhaust temperature of the air conditioning system. The setting principle, meaning, etc. of the first opening are preset, and reference is made to the corresponding description of the foregoing embodiment.
Step 206: judging whether a preset opening jump condition is met. If yes, go to step 207; otherwise, go to step 205, control the expansion valve to continue to operate at the preset first opening.
In the process of controlling the expansion valve of the startup indoor unit to operate at the preset first opening, whether the operation state, parameters and the like of the air conditioning system meet preset opening skip conditions is also judged in real time, and different controls are executed according to the judgment result.
The setting principle of the preset opening jump condition is as follows: when the preset opening jump condition is met, the air conditioning system is not easy to generate low exhaust temperature faults or is not easy to generate low exhaust temperature faults in a short time.
In some embodiments, the preset opening skip condition includes any one of the following conditions:
(1) The expansion valve is operated under the condition that the duration of the preset first opening reaches a first time threshold value;
(2) The expansion valve is operated in a preset first opening degree to continuously reach a second time threshold value, and the minimum exhaust superheat degree of the indoor unit is operated to be larger than the first exhaust superheat degree threshold value;
(3) The expansion valve is operated in a preset first opening degree continuously reaching a third time threshold value and the maximum exhaust superheat degree of the indoor unit is operated to be larger than a second exhaust superheat degree threshold value;
(4) And the current internal machine starting rate is greater than the second starting rate threshold value.
That is, if any one of the four conditions is satisfied, it is determined that the preset opening skip condition is satisfied.
The first time threshold, the second time threshold and the third time threshold are all known values, and can be preset fixed values or dynamic variable values. In some embodiments, the first time threshold t1, the second time threshold t2, and the third time threshold t3 are all fixed values, and t1=10 min, t2=5 min, t3=1 min.
The method for obtaining the exhaust superheat degree of the outdoor unit is the prior art. First exhaust gas passingThe heat threshold and the second exhaust superheat threshold are both known values, and can be either preset fixed values or dynamic variable values. In some embodiments, a first discharge superheat threshold T d-SH1 First exhaust superheat threshold T d-SH2 Are all fixed values, and T d-SH1 =20℃，T d-SH2 =90℃。
The second power-on threshold is a known value, and can be a preset fixed value or a dynamic variable value. In some embodiments, the second power-on threshold r2 is a fixed value, and r2=30%.
Step 207: and controlling the opening of the expansion valve according to an automatic opening adjustment strategy.
When the step 204 judges that the current outdoor environment temperature and the current startup parameters of the internal machine do not meet the preset opening adjustment conditions, the air conditioning system is not easy to generate low exhaust temperature faults; after it is determined in step 206 that the air conditioning system satisfies the preset opening skip condition, the air conditioning system is not prone to low exhaust temperature failure or is not prone to low exhaust temperature failure in a short time. Under the two states, the opening of the expansion valve is controlled according to an automatic opening adjustment strategy, so that the normal operation control of the air conditioning system is realized, and the requirements of users on the air conditioning performance and effect provided by the air conditioning system are met.
The automatic opening adjustment strategy for controlling the opening of the expansion valve is a known adjustment strategy, and can be realized by adopting the prior art for adjusting the opening of the expansion valve in the multi-split air conditioning system.
Fig. 3 is a schematic flow chart of a third embodiment of a control method of a multi-split air conditioning system according to the present application. The multi-split air conditioner comprises a plurality of outdoor units and a plurality of indoor units.
As illustrated in fig. 3, this embodiment employs the following procedure to achieve control during operation of the multi-split air conditioning system. Specifically, the rotation speed of the fan operating the outdoor unit is controlled.
Step 301: the indoor unit is started up to operate.
Step 302: and acquiring the current condensing pressure, the current outdoor environment temperature and the current startup parameters of the internal machine.
The meaning of the current condensing pressure, the current outdoor environment temperature, the current startup parameter of the internal machine, the acquisition method and the like are referred to in the corresponding description of the foregoing embodiments.
Step 303: judging whether a preset pressure condition is met. If yes, go to step 304; otherwise, go to step 307.
Specifically, it is determined whether the current condensing pressure satisfies a preset pressure condition. The principle of setting the preset pressure conditions is referred to in the corresponding description of the previous embodiments. In this embodiment, the preset pressure conditions include: the current condensing pressure is less than a first condensing pressure threshold; alternatively, the current condensing pressure is greater than the second condensing pressure threshold.
Step 304: it is determined whether the first state is satisfied. If yes, go to step 305; otherwise, step 306 is performed.
Specifically, whether the current outdoor environment temperature and the current startup parameters of the internal machine meet the first state is judged, and different controls are executed according to the judging result.
The first state is a preset state. In this embodiment, the internal machine start-up parameter is an internal machine start-up probability. The first state includes: the outdoor environment temperature is greater than a preset external environment temperature threshold in the first state, and the internal machine startup rate is greater than a preset startup rate threshold in the first state. In some embodiments, the preset outer ring temperature threshold value in the first state is a fixed value and is 20 ℃; the preset on probability threshold in the first state is a fixed value and 25%.
The first state is satisfied, that is, the outdoor environment temperature is greater than a preset external environment temperature threshold in the first state, and the startup rate of the internal machine is greater than a preset startup rate threshold in the first state. The first state is not satisfied, which means that the outdoor environment temperature is not greater than a preset external environment temperature threshold in the first state, or the starting-up rate of the internal machine is not greater than a preset opening probability threshold in the first state.
Step 305: and controlling the rotating speed of the fan according to the first adjusting strategy or the third adjusting strategy.
When it is determined in step 303 that the current condensing pressure meets the preset pressure condition and it is determined in step 304 that the current outdoor environment temperature and the current startup parameter of the internal unit meet the first state, the rotational speed of the fan of the outdoor unit corresponding to the condensing pressure is controlled according to the known first adjustment strategy or the third adjustment strategy further according to the relationship between the current condensing pressure and the preset condensing pressure threshold.
And when the current condensing pressure is judged to meet the condition smaller than the first condensing pressure threshold value in the preset pressure conditions and the current outdoor environment temperature and the current startup parameter of the internal machine are judged to meet the first state, controlling the rotating speed of a fan of the running outdoor machine corresponding to the condensing pressure to be reduced according to a first regulation strategy. In some embodiments, the first adjustment strategy comprises: the rotating speed of the fan immediately rotates to the lowest rotating speed, and the fan stops rotating after the fan runs for 1min.
And when the current condensing pressure is judged to meet the condition that the current condensing pressure is larger than the second condensing pressure threshold value in the preset pressure conditions and the current outdoor environment temperature and the current startup parameter of the internal machine are judged to meet the first state, controlling the rotating speed of a fan of the outdoor machine corresponding to the condensing pressure to rise according to a third regulation strategy. In some embodiments, the third adjustment strategy comprises: the rotational speed of the blower is increased at a speed of 1 gear/20 seconds, and immediately after 1min, the rotational speed is increased to the highest rotational speed. The highest rotational speed is a known value.
Step 306: and controlling the rotating speed of the fan according to the second adjusting strategy or the fourth adjusting strategy.
When it is determined in step 303 that the current condensing pressure meets the preset pressure condition and it is determined in step 304 that the current outdoor environment temperature and the current startup parameter of the internal unit do not meet the first state, the rotation speed of the fan of the outdoor unit running corresponding to the condensing pressure is controlled according to a known second adjustment strategy or a fourth adjustment strategy according to the relationship between the current condensing pressure and the preset condensing pressure threshold.
And when the current condensing pressure is judged to meet the condition smaller than the first condensing pressure threshold value in the preset pressure conditions and the current outdoor environment temperature and the current startup parameter of the internal machine are judged not to meet the first state, controlling the rotating speed of a fan of the running outdoor machine corresponding to the condensing pressure to be reduced according to a second regulation strategy. And the speed reduction rate of the speed reduction according to the second adjustment strategy is not more than the speed reduction rate of the speed reduction according to the first adjustment strategy, so that the impact on the compressor is avoided to influence the operation stability and the service life. In some embodiments, the second adjustment strategy comprises: the rotation speed of the fan is reduced at a speed of 5 gears/20 seconds, and the fan keeps running at the lowest rotation speed after being reduced to the lowest rotation speed. The lowest rotational speed is a known value.
And when the current condensing pressure is judged to meet the condition that the current condensing pressure is larger than the second condensing pressure threshold value in the preset pressure conditions and the current outdoor environment temperature and the current startup parameter of the internal machine are judged not to meet the first state, controlling the rotating speed of the fan of the outdoor unit corresponding to the condensing pressure to rise according to a fourth regulation strategy. The speed increasing rate of the speed increasing according to the fourth adjusting strategy is not larger than the speed increasing rate of the speed increasing according to the third adjusting strategy, so that the impact on the compressor is avoided, and the running stability and the service life are prevented from being influenced. In some embodiments, the fourth adjustment strategy comprises: the rotational speed of the blower is increased at a speed of 1 gear/20 seconds, and after 1min, it is increased to the maximum rotational speed at a speed of 5 gear/20 seconds.
Step 307: and controlling the rotating speed of the fan according to the fifth adjusting strategy or the sixth adjusting strategy.
When it is determined in step 303 that the current condensing pressure does not meet the preset pressure condition, the rotation speed of the fan of the outdoor unit corresponding to the condensing pressure is controlled according to the known fifth adjustment strategy or sixth adjustment strategy according to the relationship between the current condensing pressure and other preset condensing pressure thresholds.
Specifically, when the current condensing pressure is not less than the first condensing pressure threshold and is less than the third condensing pressure threshold, controlling the rotating speed of the fan running the outdoor unit to be reduced according to a fifth adjusting strategy. Moreover, the rate of decrease in speed according to the fifth adjustment strategy is not greater than the rate of decrease in speed according to the second adjustment strategy. The third condensing pressure threshold is a known value, and may be a preset fixed value or a dynamically variable value. In some embodiments, a third condensing pressure threshold P d 3 is a fixed value, and P d 3=2.3 MPa. In some embodiments, the fifth adjustment strategy comprises: the rotation speed of the fan is reduced at a speed of 1 gear/20 seconds, and the fan keeps running at the lowest rotation speed after being reduced to the lowest rotation speed.
And when the current condensing pressure is not less than the third condensing pressure threshold and is less than the fourth condensing pressure threshold, controlling the rotating speed of the fan running the outdoor unit to be unchanged. The fourth condensing pressure threshold is a known value, and may be a preset fixed value or a dynamically variable value. In some embodiments, the fourth condensing pressure threshold P d 4 is a fixed value, and P d 4=2.7MPa。
And when the current condensing pressure is not smaller than the fourth condensing pressure threshold and is not larger than the second condensing pressure threshold, controlling the rotating speed of the fan running the outdoor unit to rise according to a sixth adjusting strategy. And the rate of rise of the rise according to the sixth regulation strategy is not greater than the rate of rise of the rise according to the fourth regulation strategy. In some embodiments, the sixth adjustment strategy comprises: the rotational speed of the blower is increased at a speed of 1 gear/20 seconds until it is increased to the maximum rotational speed.
The multi-split air conditioning system with a plurality of indoor units and a plurality of outdoor units is provided with a controller, and the controller is configured to execute the control method in each embodiment, so that the running reliability and the high efficiency of the air conditioning system can be improved.
Fig. 4 shows a block diagram of an embodiment of the electronic device of the application. The electronic device includes a processor 41, a memory 42, and a computer program 421 stored on the memory 42, where the processor 41 is configured to execute the computer program 421 to implement the multi-split air conditioning system control method of the embodiment shown in fig. 1, the embodiment shown in fig. 2, the embodiment shown in fig. 3, and other embodiments, and achieve the technical effects of the corresponding embodiments. The electronic equipment can be a main control board, a controller and the like of the multi-split air conditioning system.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. The control method of the multi-split air conditioning system is characterized by comprising the following steps of:
acquiring the current outdoor environment temperature, the current startup parameters of the indoor unit and the current condensing pressure of the running outdoor unit in the startup operation process of the indoor unit;
when the current outdoor environment temperature and the current indoor unit startup parameters meet preset opening adjustment conditions, controlling an expansion valve of the startup indoor unit to operate at a preset first opening so as to adjust the exhaust temperature of an air conditioning system; the preset opening adjustment condition includes: the current internal machine starting rate is smaller than a first starting rate threshold value; or the current outdoor environment temperature is smaller than the first outer ring temperature threshold value;
when the current condensing pressure meets the preset pressure condition, controlling the rotating speed of a fan of the running outdoor unit according to the current outdoor environment temperature, the current startup parameter of the indoor unit and a preset rotating speed adjusting strategy so as to adjust the condensing pressure of an air conditioning system;
the preset pressure conditions include: the current condensing pressure is smaller than a first condensing pressure threshold value, or the current condensing pressure is larger than a second condensing pressure threshold value;
controlling the rotating speed of the fan of the running outdoor unit according to the current outdoor environment temperature, the current internal unit start-up and a preset rotating speed adjusting strategy, and comprising:
when the current condensing pressure is smaller than the first condensing pressure threshold value and the current outdoor environment temperature and the current startup parameter of the internal machine meet a first state, controlling the rotating speed of a fan of the running outdoor machine to reduce according to a first regulation strategy;
when the current condensing pressure is smaller than the first condensing pressure threshold value and the current outdoor environment temperature and the current startup parameter of the internal machine do not meet the first state, controlling the rotating speed of a fan of the running outdoor machine to reduce according to a second regulation strategy; the speed reduction rate according to the second adjustment strategy is not greater than the speed reduction rate according to the first adjustment strategy;
when the current condensing pressure is larger than the second condensing pressure threshold value and the current outdoor environment temperature and the current internal machine starting parameter meet the first state, controlling the rotating speed of a fan of the running outdoor machine to rise according to a third adjusting strategy;
when the current condensing pressure is larger than the second condensing pressure threshold value and the current outdoor environment temperature and the current startup parameter of the internal machine do not meet the first state, controlling the rotating speed of a fan of the running outdoor machine to rise according to a fourth regulation strategy; the rate of rise of the speed according to the fourth adjustment strategy is not greater than the rate of rise of the speed according to the third adjustment strategy.
2. The method for controlling a multi-split air conditioning system according to claim 1, wherein,
the current internal machine starting parameter is the current internal machine starting probability;
the preset opening adjustment condition includes:
the current internal machine starting rate is smaller than a first starting rate threshold value;
or, the current outdoor environment temperature is less than a first outdoor environment temperature threshold.
3. The control method of a multi-split air conditioning system according to claim 1, further comprising:
when the expansion valve runs at the preset first opening degree, the opening degree of the expansion valve is controlled according to a known automatic opening degree adjustment strategy when a preset opening degree jump condition is met.
4. The control method of a multi-split air conditioning system according to claim 3, further comprising:
and when the current outdoor environment temperature and the current startup parameters of the internal unit do not meet the preset opening adjustment conditions, controlling the opening of the expansion valve according to the automatic opening adjustment strategy.
5. The method for controlling a multi-split air conditioning system according to claim 3, wherein,
the current internal machine starting parameter is the current internal machine starting probability;
the preset opening jump condition comprises any one of the following conditions:
the expansion valve is operated under the condition that the duration time of the preset first opening reaches a first time threshold value;
the expansion valve is operated according to the preset first opening degree, the operation duration reaches a second time threshold value, and the minimum exhaust superheat degree of the outdoor unit is greater than a first exhaust superheat degree threshold value;
the expansion valve is operated according to the preset first opening degree, the operation duration reaches a third time threshold value, and the maximum exhaust superheat degree of the outdoor unit is greater than a second exhaust superheat degree threshold value;
and the current internal machine starting rate is greater than a second starting rate threshold value.
6. The control method of a multi-split air conditioning system according to any one of claims 1 to 5, characterized in that the control method further comprises:
after the indoor unit is started, firstly controlling the expansion valve of the indoor unit to operate at a preset initial opening, and then executing the process of acquiring the current outdoor environment temperature, the current indoor unit starting parameter and the current condensing pressure of the operating outdoor unit.
7. The control method of a multi-split air conditioning system according to claim 1, further comprising:
when the current condensing pressure is not smaller than the first condensing pressure threshold and smaller than a third condensing pressure threshold, controlling the rotating speed of the fan of the running outdoor unit to reduce according to a fifth adjusting strategy; the speed reduction rate according to the fifth adjustment strategy is not greater than the speed reduction rate according to the second adjustment strategy;
when the current condensing pressure is not smaller than the third condensing pressure threshold and smaller than the fourth condensing pressure threshold, controlling the rotating speed of the fan of the running outdoor unit to be unchanged;
when the current condensing pressure is not smaller than the fourth condensing pressure threshold and is not larger than the second condensing pressure threshold, controlling the rotating speed of the fan of the outdoor unit to rise according to a sixth adjusting strategy; the rate of rise of the rise according to the sixth adjustment strategy is not greater than the rate of rise of the rise according to the fourth adjustment strategy.
8. The utility model provides a many online air conditioning system, includes a plurality of indoor set and a plurality of off-premises station, its characterized in that still includes:
a controller configured to perform the multi-split air conditioning system control method of any one of the above claims 1 to 7.
9. An electronic device comprising a processor, a memory and a computer program stored on the memory, wherein the processor is configured to execute the computer program to implement the multi-split air conditioning system control method of any one of claims 1 to 7.
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| CN202210311494.XA CN114811860B (en) | 2022-03-28 | 2022-03-28 | Control method of multi-split air conditioning system and multi-split air conditioning system |
| PCT/CN2022/125470 WO2023184931A1 (en) | 2022-03-28 | 2022-10-14 | Multi-split air conditioner system control method and multi-split air conditioner system |
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| CN115451547B (en) * | 2022-09-16 | 2024-05-10 | 宁波奥克斯电气股份有限公司 | Fixed drag addressing method and air conditioner |
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