CN114992816B - Control method and device of multi-split air conditioner, air conditioner and readable storage medium - Google Patents

Control method and device of multi-split air conditioner, air conditioner and readable storage medium Download PDF

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Publication number
CN114992816B
CN114992816B CN202210698782.5A CN202210698782A CN114992816B CN 114992816 B CN114992816 B CN 114992816B CN 202210698782 A CN202210698782 A CN 202210698782A CN 114992816 B CN114992816 B CN 114992816B
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Prior art keywords
temperature
expansion valve
target
opening
temperature interval
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CN114992816A (en
Inventor
陈东
黄春
鲍洋
吉金浩
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F24F11/67—Switching between heating and cooling modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a control method and device of a multi-split air conditioner, the air conditioner and a readable storage medium, wherein the control method comprises the following steps: detecting an exhaust temperature of the compressor in case that the outdoor unit is operated in a heating mode; determining a target temperature interval to which the exhaust temperature belongs in at least three temperature intervals according to the exhaust temperature; when the indoor unit is in a stop state, the opening degree of the expansion valve of the indoor unit is controlled by adopting a target control mode corresponding to a target temperature interval. The invention solves the problem of reducing the noise of the internal machine of the shutdown of the multi-connected air conditioner.

Description

Control method and device of multi-split air conditioner, air conditioner and readable storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of a multi-split air conditioner, the air conditioner and a readable storage medium.
Background
With the development of multi-connected air conditioners, when the multi-connected air conditioning system heats and operates, the multi-connected air conditioning system is stopped or stopped until the temperature is reached to avoid accumulated liquid, namely, when the inner machine does not operate, the inner machine is prevented from accumulating refrigerant, the inner machine expansion valve keeps small opening degree to operate, at the moment, the refrigerant flows through, and air flow sound exists, but as the requirements of users on noise are higher and higher, the control in the related technology can not meet the requirements of the users on noise reduction, so on the basis of not increasing the cost and meeting reliable operation, how to reduce the noise of the inner machine of the multi-connected air conditioning system is a difficult problem for research of various factories at present.
Therefore, how to reduce the noise of the internal unit of the multi-connected air conditioner when the multi-connected air conditioner is stopped becomes a problem to be solved.
Disclosure of Invention
The invention solves the problem of reducing the noise of the internal machine of the shutdown of the multi-connected air conditioner.
In order to solve the above problems, the present invention provides a control method of a multi-split air conditioner, including: detecting an exhaust temperature of the compressor in case that the outdoor unit is operated in a heating mode; determining a target temperature interval to which the exhaust temperature belongs in at least three temperature intervals according to the exhaust temperature; when the indoor unit is in a stop state, the opening degree of the expansion valve of the indoor unit is controlled by adopting a target control mode corresponding to a target temperature interval.
Compared with the prior art, the scheme can achieve the following effects: the exhaust temperature has a certain relation with the liquid accumulation degree of the refrigerant liquid of the system, meanwhile, the liquid accumulation degree of the refrigerant liquid has a certain relation with the opening degree of the expansion valve of the inner machine, if the exhaust temperature is lower, the refrigerant of the system runs sufficiently, the expansion valve of the inner machine can be closed at the moment, no refrigerant flows at the moment, no noise is emitted at the moment, but along with the closing of the expansion valve of the inner machine during the stop, the inner machine gradually starts to accumulate liquid at the moment, the exhaust temperature also rises, the closed expansion valve of the inner machine is properly and slowly opened, and the refrigerant liquid is properly discharged, so that the exhaust temperature of the system is prevented from being too high, the opening degree required by the expansion valve of the inner machine can be directly determined through the value of the exhaust temperature, and the noise of the inner machine during the stop can be effectively reduced.
In one embodiment of the present invention, controlling the opening degree of the internal expansion valve using a target control mode corresponding to a target temperature zone includes: determining a target state type to which the shutdown state belongs from at least two state types; controlling the opening of the expansion valve of the internal machine by adopting a target control mode corresponding to the target state type and the target temperature interval; wherein the at least two state types include a heating shutdown state and a warming shutdown state.
Compared with the prior art, the effect that this scheme can reach: the target state type is any one of a heating stop state and a warming stop state, wherein the warming stop state and the heating stop state can exist at the same time, or only one or none of the two states can exist, and the target state type is mainly based on a use scene of a user. When the air conditioner is stopped, the heating stopping state and the temperature stopping state are enough for judging which type of stopping of the air conditioner occurs at the moment. By adopting different adjusting modes of the internal machine expansion valve aiming at different target state types, the flow of the refrigerant can be reduced more accurately, so that noise is reduced.
In one embodiment of the present invention, controlling the opening degree of the expansion valve of the indoor unit in the case where the indoor unit is in the warm stop state includes: controlling the opening of the expansion valve of the internal machine to be kept within a target range, and maintaining the supercooling degree of the air conditioner to be larger than or equal to a supercooling degree threshold value in the control process; the supercooling degree is the difference between the temperature of the high pressure side of the compressor and the temperature of the liquid outlet of the evaporator.
Compared with the prior art, the effect that this scheme can reach: under the condition that the indoor unit is stopped at the temperature, the opening of the expansion valve of the indoor unit is adjusted according to the supercooling degree, namely, the target range is determined according to the value of the supercooling degree, and the adjustment of the expansion valve of the indoor unit in the embodiment is mainly based on reliability consideration, so that serious system effusion can be avoided.
In one embodiment of the invention, the at least three temperature intervals include a low temperature interval, and a high temperature interval higher than the low temperature interval; when the target temperature zone is a low temperature zone, the upper limit value of the target range is a first upper limit value; when the target temperature interval is a high temperature interval, the upper limit value of the target range is a second upper limit value; wherein the second upper limit is greater than the first upper limit.
Compared with the prior art, the effect that this scheme can reach: the low temperature interval corresponds to a first upper limit value, the high temperature interval corresponds to a second upper limit value, and the second upper limit value is larger than the first upper limit value, so that when the exhaust temperature is changed from low temperature to high temperature, the accumulated liquid of the refrigerant liquid is serious, the opening upper limit of the expansion valve of the internal machine is increased, the release of the refrigerant liquid is increased, and the exhaust temperature is effectively reduced.
In one embodiment of the invention, the at least three temperature intervals comprise a first temperature interval, a second temperature interval, and a third temperature interval that are sequentially incremented; when the indoor unit is in a heating stop state, a target control mode corresponding to a target temperature interval is adopted to control the opening of the expansion valve of the indoor unit, and the method comprises the following steps: when the target temperature interval is a first temperature interval, a first target control mode corresponding to the target temperature interval is adopted to control the internal machine expansion valve to keep a first opening; and/or under the condition that the target temperature interval is a second temperature interval, adopting a second target control mode corresponding to the target temperature interval, and controlling the opening of the expansion valve of the internal machine according to the change trend of the exhaust temperature; and/or under the condition that the target temperature interval is a third temperature interval, adopting a third target control mode corresponding to the target temperature interval to control the opening of the internal expansion valve to be kept within a target range, and maintaining the supercooling degree of the air conditioner to be larger than or equal to a supercooling degree threshold value in the control process; the supercooling degree is the difference between the temperature of the high pressure side of the compressor and the temperature of the liquid outlet of the evaporator.
Compared with the prior art, the effect that this scheme can reach: in a specific embodiment, the adjustment of the opening of the expansion valve of the inner machine in the first temperature interval, the second temperature interval and the third temperature interval is specifically described, so that the adjustment of the opening of the expansion valve of the inner machine is more accurate, and the noise of the refrigerant flowing can be reduced most effectively.
In one embodiment of the present invention, controlling the opening degree of the internal expansion valve according to the trend of variation in the exhaust gas temperature includes: controlling an internal engine expansion valve to maintain a second opening degree, and detecting whether the exhaust temperature is in a rising change trend; if so, controlling the opening of the expansion valve of the internal machine according to the temperature rising rate change trend of the exhaust temperature.
Compared with the prior art, the effect that this scheme can reach: the internal expansion valve keeps the second opening degree, a certain amount of refrigerant liquid is kept to flow, at the moment, whether the exhaust temperature is in the rising change trend is detected more intuitively, and if the exhaust temperature is still continuously rising, the fact that the opening degree of the internal expansion valve is too small can be directly described.
In one embodiment of the present invention, controlling the opening degree of the internal expansion valve according to the temperature increase rate variation trend of the exhaust gas temperature includes: and under the condition that the temperature rising rate change trend is that the temperature rising rate is slow, controlling the expansion valve of the internal machine to increase the opening according to the temperature rising rate change degree of the exhaust temperature.
Compared with the prior art, the effect that this scheme can reach: under the condition that the temperature rising rate of the exhaust temperature is slowed down, the opening degree of the expansion valve of the internal machine is properly increased, and the flowing air flow sound of the refrigerant of the internal machine can be effectively considered, and meanwhile, the system effusion is avoided.
In one embodiment of the present invention, the opening degree of the internal expansion valve is kept smaller than or equal to the opening degree threshold value during the control of the opening degree of the internal expansion valve.
Compared with the prior art, the effect that this scheme can reach: the opening degree of the expansion valve of the internal machine is kept to be smaller than or equal to the opening degree threshold value, so that the expansion valve of the internal machine can be prevented from being damaged.
In one embodiment of the present invention, controlling the opening degree of the internal expansion valve according to the temperature increase rate variation trend of the exhaust gas temperature includes: under the condition that the temperature rising rate change trend is that the temperature rising rate is accelerated or unchanged, controlling the opening of the expansion valve of the internal machine to be increased to a third opening and maintaining the target time; controlling the opening of the expansion valve of the internal machine to be kept within a target range, and maintaining the supercooling degree of the air conditioner to be larger than or equal to a supercooling degree threshold value in the control process; the supercooling degree is the difference between the temperature of the high pressure side of the compressor and the temperature of the liquid outlet of the evaporator.
Compared with the prior art, the effect that this scheme can reach: the opening degree of the expansion valve of the internal machine is determined according to the temperature rise rate change of the exhaust temperature, so that the refrigerant liquid is effectively discharged by increasing the opening degree of the expansion valve of the internal machine under the condition that the exhaust temperature rises too fast, and the exhaust temperature is reduced.
In one embodiment of the invention, the at least three temperature intervals further comprise a fourth temperature interval lower than the first temperature interval; when the indoor unit is in a heating stop state, a target control mode corresponding to a target temperature interval is adopted to control the opening of the expansion valve of the indoor unit, and the method comprises the following steps: when the target temperature interval is a fourth temperature interval, a fourth target control mode corresponding to the target temperature interval is adopted to control the internal expansion valve to maintain a fourth opening; wherein the fourth opening is smaller than the first opening.
Compared with the prior art, the scheme can achieve the following effects: the arrangement of the fourth temperature interval widens the range where the exhaust temperature can be, correspondingly increases the control range of the opening degree of the expansion valve of the internal machine, and improves the control precision of the exhaust temperature on the opening degree of the expansion valve of the internal machine.
In one embodiment of the present invention, there is provided a control device for a multi-split air conditioner, including: the detection module is used for detecting the exhaust temperature of the compressor under the condition that the outdoor unit operates in a heating mode; the determining module is used for determining a target temperature interval to which the exhaust temperature belongs in at least three temperature intervals according to the exhaust temperature; the control module is used for controlling the opening of the expansion valve of the indoor unit by adopting a target control mode corresponding to a target temperature interval under the condition that the indoor unit is in a stop state.
Compared with the prior art, the scheme can achieve the following effects: the control device in this embodiment can execute the control method in any of the above embodiments, so that the control device has the beneficial effects of any of the above embodiments, and will not be described herein.
In one embodiment of the present invention, there is provided an air conditioner including: a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the control method as in any of the above embodiments.
Compared with the prior art, the scheme can achieve the following effects: the control device can realize the steps of the control method of any embodiment of the invention, and the processor can run all instructions and programs in the memory, so that the air conditioner can respond quickly and has higher precision when realizing the instructions.
In one embodiment of the present invention, there is provided a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the steps of the control method as in any of the above embodiments.
Compared with the prior art, the scheme can achieve the following effects: the readable storage medium is in the steps of implementing the control method according to any embodiment of the present invention, so that it has all the advantages of the method according to any embodiment of the present invention, and will not be described herein.
Drawings
FIG. 1 is a flow chart of steps of a control method of a multi-split air conditioner according to some embodiments of the present invention;
FIG. 2 is a schematic diagram of a control device according to some embodiments;
FIG. 3 is a schematic diagram of a hollow structure in some embodiments.
Reference numerals illustrate:
100. a control device; 101. a detection module; 102. a determining module; 103. a control module; 200. an air conditioner; 201. a processor; 202. a memory.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments.
Embodiment one:
the embodiment provides a control method of a multi-split air conditioner, which comprises the following steps: detecting an exhaust temperature of the compressor in case that the outdoor unit is operated in a heating mode; determining a target temperature interval to which the exhaust temperature belongs in at least three temperature intervals according to the exhaust temperature; when the indoor unit is in a stop state, the opening degree of the expansion valve of the indoor unit is controlled by adopting a target control mode corresponding to a target temperature interval.
Referring to fig. 1, in this embodiment, starting from step S101, step S102 is entered, at this time, the multi-connected air conditioner is in a stopped state, the internal machine is not operated, then step S103 is entered, the exhaust temperature of the compressor is detected, and at least three divided temperature intervals are factory-set temperature intervals, and the number of temperature intervals and the upper and lower limit values of each temperature interval can be set according to different working conditions. Then, step S104 is performed, a temperature interval in which the exhaust temperature is located is determined according to the detected exhaust temperature, each different temperature interval corresponds to each different target range, the opening of the internal expansion valve can be directly adjusted through the temperature interval in which the exhaust temperature is located, and step S105 is performed.
In this embodiment, only the multi-split air conditioner has the internal unit in the on state and the internal unit in the off state at the same time. Specifically, the currently detected exhaust temperature is set to be T, and the unit of the exhaust temperature is degrees celsius. The at least three temperature intervals include when T is equal to or less than A, when T is greater than A and T is equal to or less than B, when T is equal to or less than B is equal to or less than C, and when T is greater than C. The A, B, C, D is a preset temperature value, is a factory preset value of the air conditioner, and can be adjusted according to actual working conditions. In this embodiment, the selection range of A is preferably between 60 and 70 ℃, the value of A is preferably 65 ℃, the selection range of B is preferably between 70 and 80 ℃, the value of B is preferably 80 ℃, the selection range of C is preferably between 80 and 95 ℃, and the value of C is preferably 95 ℃. The unit of the temperature appearing in the whole specification is the degree centigrade, and the unit of the opening of the internal-machine expansion valve appearing in the whole specification is pls.
Specifically, according to the temperature range of the exhaust gas temperature currently detected, the opening degree of the internal expansion valve is correspondingly controlled to operate or the opening degree is correspondingly controlled. The exhaust temperature and the liquid accumulation degree of the refrigerant liquid of the system have a certain relation, meanwhile, the liquid accumulation degree of the refrigerant liquid and the opening degree of the expansion valve of the internal machine have a certain relation, if the exhaust temperature is lower, the refrigerant of the system runs sufficiently, the expansion valve of the internal machine can be closed at the moment, no refrigerant flows at the moment, no noise is emitted at the moment, but along with the closing of the expansion valve of the internal machine during the stop, the internal machine gradually starts to accumulate liquid at the moment, the exhaust temperature also rises, the closed expansion valve of the internal machine is properly and slowly opened, and the refrigerant liquid is properly discharged, so that the excessive high exhaust temperature of the system is avoided, the opening degree required by the expansion valve of the internal machine can be directly determined through the value of the exhaust temperature, and the noise of the internal machine during the stop can be effectively reduced.
Embodiment two:
in this embodiment, the controlling the opening of the internal expansion valve by using the target control mode corresponding to the target temperature interval includes: determining a target state type to which the shutdown state belongs from at least two state types; controlling the opening of the expansion valve of the internal machine by adopting a target control mode corresponding to the target state type and the target temperature interval; wherein the at least two state types include a heating shutdown state and a warming shutdown state.
In this embodiment, the at least two state types include a heating stop state and a warm stop state, where the heating stop state is a stop caused by the air conditioner when the air conditioner is in the heating mode and the warm stop state is a stop performed after the air conditioner reaches an indoor set temperature. Namely, the shutdown state comprises a heating shutdown state and a warming shutdown state.
The target state type is any one of a heating stop state and a warming stop state, wherein the warming stop state and the heating stop state may exist at the same time, or only one of the two states may exist, or none of the two states may exist, and the target state type is mainly based on a use scene of a user. When the air conditioner is stopped, the heating stopping state and the temperature stopping state are enough for judging which type of stopping of the air conditioner occurs at the moment. By adopting different adjusting modes of the internal machine expansion valve aiming at different target state types, the flow of the refrigerant can be reduced more accurately, so that noise is reduced.
Embodiment III:
in this embodiment, when the indoor unit is in the warm stop state, controlling the opening of the indoor unit expansion valve includes: controlling the opening of the expansion valve of the internal machine to be kept within a target range, and maintaining the supercooling degree of the air conditioner to be larger than or equal to a supercooling degree threshold value in the control process; the supercooling degree is the difference between the temperature of the high pressure side of the compressor and the temperature of the liquid outlet of the evaporator.
In this embodiment, it is specifically described how the opening degree of the expansion valve of the indoor unit is adjusted when the indoor unit is in the warm stop state. When T is less than or equal to a, the opening of the internal expansion valve is adjusted according to the supercooling degree control during the warm stop, and the opening of the internal expansion valve is in a first range, wherein the first range can be adjusted according to the actual use condition, and the first range in the embodiment is preferably 20pls to 70pls, that is, the opening of the internal expansion valve is ensured to be adjusted between 20pls and 70pls. At this time, the exhaust temperature is lower, and the system effusion is not serious, so that the expansion valve of the internal machine can be adjusted by a small opening degree.
When T is greater than a and less than or equal to B, that is, the detected exhaust temperature is within the temperature range, the exhaust temperature is properly increased, and likewise, the system effusion is gradually increased, and at the same time, the opening of the internal expansion valve is properly increased, so that the opening of the internal expansion valve is adjusted within a second range, and likewise, the second range is adjustable according to the actual use condition, and in this embodiment, the second range is preferably between 20pls and 70pls, and the opening of the internal expansion valve is adjusted within this second range according to the actual effusion condition.
When T is greater than C, the exhaust temperature is at a very high value, and at this time, the problem of liquid accumulation of the system is also serious, that is, more refrigerant liquid is accumulated, and at this time, the opening of the internal expansion valve is adjusted in a third range, and the third range is also adjusted according to the use condition, and in this embodiment, the third range is preferably 20pls to 100pls.
It should be noted that, when T is less than or equal to C and greater than B, the air conditioner that is stopped at this time is at the exhaust temperature of an intermediate gear, at this time, the exhaust temperature is not too high or too low, the temperature interval of this exhaust temperature is a range of the exhaust temperature that is most easily reached in the use process of the multi-split air conditioner, at this time, the change rate of the exhaust temperature needs to be continuously detected multiple times, the change rate of the exhaust temperature is the change condition of the exhaust temperature in unit time, specifically, when the change rate of the exhaust temperature is greater than 0 in unit time, similarly to the first detection, the exhaust temperature rises by 1 degree in unit time, and the exhaust temperature rises by 2 degrees in unit time in the second detection.
When the rate of change of the exhaust gas temperature is equal to 0 in unit time, similarly to the first detection, the exhaust gas temperature rises by 1 degree in unit time, and the second detection, the exhaust gas temperature also rises by 1 degree in unit time.
Or increasingly flattens, the rate of change of the exhaust temperature is less than 0 per unit time, and specifically, similar to the first detection, the exhaust temperature rises by 2 degrees per unit time, but the second detection, the exhaust temperature rises by 1 degree per unit time. If the change rate of the exhaust temperature in the unit time is greater than or equal to 0, the opening degree of the internal expansion valve is adjusted according to a fourth range, and the fourth range can be adjusted according to the actual use condition. The fourth range in this embodiment is preferably 20pls to 100pls.
When the exhaust temperature increases gradually, that is, when the rate of change of the exhaust temperature per unit time is less than 0, the opening of the internal expansion valve is adjusted according to a fifth range, which is adjustable according to the actual use condition, the fifth range in this embodiment is preferably 20pls to 70pls.
It should be noted that, the supercooling degree threshold is a factory preset value, and can be adjusted and set according to different use conditions of the air conditioner, and meanwhile, maintaining that the supercooling degree of the air conditioner is greater than or equal to the supercooling degree threshold in the control process is considered based on noise reduction and liquid accumulation avoidance.
Embodiment four:
in this embodiment, the at least three temperature intervals include a low temperature interval and a high temperature interval higher than the low temperature interval; when the target temperature zone is a low temperature zone, the upper limit value of the target range is a first upper limit value; when the target temperature interval is a high temperature interval, the upper limit value of the target range is a second upper limit value; wherein the second upper limit is greater than the first upper limit.
In this embodiment, in combination with the third embodiment, the interval value between the low temperature section and the high temperature section is within the temperature range when the exhaust temperature T is equal to or lower than C and greater than B. When the increase of the exhaust temperature gradually becomes gentle a plurality of times in succession, the target range includes a first range, a second range, and a fifth range, and at this time, the upper limit value of the target range is a first upper limit value, specifically 70pls. When the increase of the exhaust temperature is larger and larger for a plurality of times, the target range includes the third range and the fourth range, and at this time, the upper limit value of the target range is the second upper limit value, and the second upper limit value is specifically 100pls.
Fifth embodiment:
in this embodiment, when the indoor unit is in the heating stop state, controlling the opening of the indoor unit expansion valve includes: controlling an expansion valve of the internal machine to keep a fixed opening; and/or controlling the opening degree of the expansion valve of the internal machine according to the change trend of the exhaust temperature; and/or controlling the opening of the expansion valve of the internal machine to be kept within a target range, and maintaining the supercooling degree of the air conditioner to be larger than or equal to a supercooling degree threshold value in the control process; the supercooling degree is the difference between the temperature of the high pressure side of the compressor and the temperature of the liquid outlet of the evaporator.
In this embodiment, a case where the air conditioner indoor unit is in a heating stop state is specifically described. Wherein, when the exhaust temperature T is equal to or less than a, and when the exhaust temperature T is equal to or greater than a and equal to or less than B, the internal expansion valve is controlled to maintain a fixed opening degree within this range.
When the exhaust temperature T is greater than B and less than or equal to C, the opening degree of the internal expansion valve is controlled to be kept constant, and according to the variation trend of the exhaust temperature, the opening degree of the internal expansion valve is controlled, namely, the internal expansion valve is firstly fixed for a period of time, and then the opening degree of the internal expansion valve is regulated within a certain range according to the variation trend of the exhaust temperature. Similarly, when the exhaust temperature T is greater than B and less than or equal to C, the internal expansion valve is controlled to maintain a fixed opening, and the opening of the internal expansion valve is controlled according to the trend of the exhaust temperature, and the opening of the internal expansion valve is controlled to be within a target range, and the supercooling degree of the air conditioner is maintained to be greater than or equal to a supercooling degree threshold in the control process, that is, it means that the internal expansion valve is fixed for a period of time first, then fixed for a period of time according to the trend of the exhaust temperature, and finally the opening of the internal expansion valve is adjusted within a target range determined according to the supercooling degree in a certain range.
When the exhaust temperature T is greater than C, the opening of the expansion valve of the internal machine is controlled to be kept within a target range, and the supercooling degree of the air conditioner is maintained to be greater than or equal to a supercooling degree threshold value in the control process, namely, the opening of the expansion valve of the internal machine is regulated according to the target range determined by the supercooling degree.
Example six:
in this embodiment, the at least three temperature intervals include a first temperature interval, a second temperature interval, and a third temperature interval that sequentially increase; when the indoor unit is in a heating stop state, a target control mode corresponding to a target temperature interval is adopted to control the opening of the expansion valve of the indoor unit, and the method comprises the following steps: when the target temperature interval is a first temperature interval, a first target control mode corresponding to the target temperature interval is adopted to control the internal machine expansion valve to keep a first opening; and/or under the condition that the target temperature interval is a second temperature interval, adopting a second target control mode corresponding to the target temperature interval, and controlling the opening of the expansion valve of the internal machine according to the change trend of the exhaust temperature; and/or under the condition that the target temperature interval is a third temperature interval, adopting a third target control mode corresponding to the target temperature interval to control the opening of the internal expansion valve to be kept within a target range, and maintaining the supercooling degree of the air conditioner to be larger than or equal to a supercooling degree threshold value in the control process; the supercooling degree is the difference between the temperature of the high pressure side of the compressor and the temperature of the liquid outlet of the evaporator.
In the present embodiment, the first temperature zone corresponds to a zone when the exhaust temperature T is greater than a and T is equal to or less than B, the second temperature zone corresponds to a zone when the exhaust temperature T is greater than B and equal to or less than C, and the third temperature zone corresponds to a zone when the exhaust temperature T is greater than C.
Specifically, the first target control mode is to fix the opening degree of the expansion valve of the internal machine at the moment to perform control operation, wherein F is the first opening degree, and F takes a value in a range which can be set according to different working conditions, preferably, the range is between 15pls and 20pls, and F is preferably 15pls.
The third target control mode is specifically that at this time, the expansion valve of the internal unit is adjusted according to the supercooling degree control, that is, the opening degree of the expansion valve of the internal unit is controlled to be kept within the target range, and the supercooling degree of the air conditioner is maintained to be greater than or equal to the supercooling degree threshold value in the control process. The target range may be set according to different working conditions, in this embodiment, the target range is preferably 20pls to Gpls, the value of G is selected to be between 40pls and 70pls, and the value of G is preferably 50pls.
Specifically, in the second target control mode, the opening degree of the internal expansion valve is fixed at first, and H takes a value in a range, which can be set according to different working conditions, preferably, the range is between 15pls and 20pls, and the Hpls is preferably 15pls. And detecting the change condition of the exhaust temperature, if the value of the exhaust temperature is larger and larger continuously for multiple times, continuously controlling and increasing the opening of the expansion valve of the internal machine, and if the value of the exhaust temperature is not in the rising trend continuously for multiple times, namely the exhaust temperature is not increased or reduced, at the moment, keeping the opening of the expansion valve of the internal machine unchanged or reducing.
The detection period of the continuous detection is preferably 1 minute and one measurement. The number of times of detecting the exhaust gas temperature a plurality of times is preferably 3 times. The accuracy of the detection result is ensured, and the occurrence of accidental situations is reduced.
Embodiment seven:
in this embodiment, according to the trend of variation of the exhaust temperature, controlling the opening of the expansion valve of the internal machine includes: controlling an internal engine expansion valve to maintain a second opening degree, and detecting whether the exhaust temperature is in a rising change trend; if so, controlling the opening of the expansion valve of the internal machine according to the temperature rising rate change trend of the exhaust temperature.
In this embodiment, in combination with the sixth embodiment, the second opening degree is the opening degree H of the internal expansion valve in the second target control mode.
The opening degree of the expansion valve of the internal machine is controlled according to the temperature rising rate change trend of the exhaust temperature, specifically, the first condition includes that the temperature rising rate of the exhaust temperature is faster or is not stable, which indicates that the exhaust temperature is not only rising, but also the rising value is larger and larger, specifically, for example, the exhaust temperature in the first detection unit time rises by 1 degree, then the exhaust temperature in the second detection unit time rises by 2 degrees, and at the moment, the temperature rising rate of the exhaust temperature is faster. For example, the exhaust temperature in the first detection unit time is increased by 1 degree, and then the exhaust temperature in the second detection unit time is increased by 1 degree, at which time the temperature increase rate of the exhaust temperature is not stabilized. And determining how the opening degree of the internal expansion valve is adjusted according to the temperature rising rate at the moment.
The second one, the rate of rise of the exhaust temperature slows down, indicating that the exhaust temperature rises, but the value of the rise is smaller and smaller, specifically, the first detected exhaust temperature rises by 1 degree at this time, then the second detected exhaust temperature rises by 0.5 degree, at this time, the rate of rise of the exhaust temperature slows down, and how the opening of the internal expansion valve is adjusted at this time is determined according to the rate of rise at this time.
Example eight:
in this embodiment, according to the temperature rise rate variation trend of the exhaust temperature, controlling the opening of the internal expansion valve includes: and under the condition that the temperature rising rate change trend is that the temperature rising rate is slow, controlling the expansion valve of the internal machine to increase the opening according to the temperature rising rate change degree of the exhaust temperature.
In this embodiment, a specific description is given of a manner of adjusting the opening degree of the expansion valve of the internal unit when the air conditioner is stopped by heating. In combination with the sixth embodiment, T is the exhaust temperature, when B < T is less than or equal to C (T is preferably 95 ℃, the preferred range of T is 80 ℃ -95 ℃), the opening of the expansion valve of the internal unit of the heating and shutdown internal unit is first fixed to hplc (H is preferably 15pls, the preferred range of H is 15pls-20 pls) to control operation, and at this time, the exhaust temperature change is detected in real time, and if the exhaust temperature change Δtn=tn-T (n-1) > 0 is detected 3 times continuously (this formula is used to determine whether the exhaust temperature is rising) (the detection period is preferably 1 minute), the following control is performed:
in combination with the seventh embodiment, when Δ (Δtn) = Δtn- Δt (n-1) < 0, it is shown that the opening degree of the internal expansion valve is controlled to be increased with a reduced rate of temperature increase. (in the present embodiment, Δtn is the rate of change of the exhaust temperature in the present cycle, and Δt (n-1) is the rate of change of the exhaust temperature in the previous cycle relative to the present cycle), that is, the internal expansion valve opening is adjusted by pmv=15pls—Δtn (PMV is the magnitude indicating the internal expansion valve opening). The period is adjusted to 40s, wherein PMV.ltoreq.PMVmax (PMVmax is preferably 25pls, PMVmax is recommended to be 20pls-30 pls).
PMVmax is an opening threshold value, and the expansion valves of the internal machine under different specifications and different working conditions are provided with different opening threshold values. Similarly, the first preset value and the first preset time can be determined according to the actual condition measurement, and in this embodiment, 15pls is a preferred value of the first preset value, and the first preset time is the above-mentioned adjustment period, preferably 40 seconds.
Since the temperature rising rate value is constant to a negative value in the present embodiment, the opening degree of the internal expansion valve is appropriately increased, thereby releasing the refrigerant liquid and reducing the exhaust temperature.
Example nine:
in this embodiment, in the process of controlling the opening degree of the internal expansion valve to increase, the opening degree of the internal expansion valve is kept to be smaller than or equal to the opening degree threshold value.
In this embodiment, the opening of the internal expansion valve has an opening threshold, which is the maximum opening that the internal expansion valve can open.
The opening degree of the expansion valve of the internal machine is kept to be smaller than or equal to the opening degree threshold value, so that the expansion valve of the internal machine can be prevented from being damaged.
Example ten:
in this embodiment, according to the temperature rise rate variation trend of the exhaust temperature, controlling the opening of the internal expansion valve includes: under the condition that the temperature rising rate change trend is that the temperature rising rate is accelerated or unchanged, controlling the opening of the expansion valve of the internal machine to be increased to a third opening and maintaining the target time; controlling the opening of the expansion valve of the internal machine to be kept within a target range, and maintaining the supercooling degree of the air conditioner to be larger than or equal to a supercooling degree threshold value in the control process; the supercooling degree is the difference between the temperature of the high pressure side of the compressor and the temperature of the liquid outlet of the evaporator.
The embodiment specifically illustrates a mode for adjusting the opening of the compressor when the air conditioner is heated and stopped. When Δ (= Δtn- Δt (n-1) > 0, combining the embodiment eight and the embodiment nine, the opening of the internal expansion valve is first adjusted to PMVmax pls, preferably for 3 minutes, and then adjusted according to the supercooling degree control, the adjustment range is 20 to I, (I is preferably 50pls, and I is preferably 40pls-70 pls).
The opening degree of the internal expansion valve in this embodiment is adjusted to an opening degree threshold, and the third opening degree is the opening degree threshold, that is, PMVmax. And maintaining the opening of the expansion valve of the internal machine as an opening threshold value and continuously maintaining the opening of the expansion valve of the internal machine for a second preset time, wherein the second preset time can be adjusted according to the actual working condition, and 3 minutes is a preferable value of the second preset time. The opening of the expansion valve of the internal machine is firstly adjusted to the opening threshold value, so that noise mutation caused by the fact that the refrigerant liquid is released too much instantly can be avoided.
After the inner machine expansion valve maintains the second preset time, the opening of the inner machine expansion valve is regulated according to the supercooling degree when the refrigerant state is stable, namely, the opening of the inner machine expansion valve is kept within a target range, and the supercooling degree of the air conditioner is maintained to be larger than or equal to a supercooling degree threshold value in the control process, so that the balance of the system is facilitated, and the noise is reduced. Wherein the target range is preferably 20pls to Ipls, the value of Ipls is preferably 40pls to 70pls, wherein I is preferably 50pls.
Example eleven:
in this embodiment, the at least three temperature intervals further include a fourth temperature interval lower than the first temperature interval; when the indoor unit is in a heating stop state, a target control mode corresponding to a target temperature interval is adopted to control the opening of the expansion valve of the indoor unit, and the method comprises the following steps: when the target temperature interval is a fourth temperature interval, a fourth target control mode corresponding to the target temperature interval is adopted to control the internal expansion valve to maintain a fourth opening; wherein the fourth opening is smaller than the first opening.
In the present embodiment, the fourth temperature zone corresponds to a temperature zone when the exhaust temperature T is equal to or less than a. Specifically, the fourth target control mode is to fix the opening of the internal expansion valve to a fourth opening, wherein the value of the fourth opening is set and selected according to the actual working condition, the value of the fourth opening is preferably between 10pls and 15pls, and the fourth opening is preferably 10pls.
Embodiment twelve:
referring to fig. 2, the present embodiment provides a control device 100 of a multi-split air conditioner 200, including: the detection module 101, the detection module 101 is used for detecting the exhaust temperature of the compressor when the outdoor unit is operated in a heating mode; the determining module 102 is configured to determine, according to the exhaust temperature, a target temperature interval to which the exhaust temperature belongs from at least three temperature intervals; and the control module 103, wherein the control module 103 is used for controlling the opening of the expansion valve of the indoor unit by adopting a target control mode corresponding to the target temperature interval when the indoor unit is in a stop state.
Embodiment thirteen:
referring to fig. 3, the present embodiment provides an air conditioner 200, the air conditioner 200 including: the processor 201, the memory 202, and a program or instructions stored on the memory 202 and executable on the processor 201, which when executed by the processor 201, implement the steps of the control method as in any of the above embodiments.
Fourteen examples:
the present embodiment provides a readable storage medium on which a program or instructions are stored which, when executed by a processor, implement the steps of the control method as in any of the above embodiments.
The readable storage medium may be any combination of one or more readable medium, and the readable storage medium may be a readable signal medium or a readable storage medium, and the readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (7)

1. The control method of the multi-split air conditioner is characterized by comprising the following steps of:
detecting an exhaust temperature of the compressor in case that the outdoor unit is operated in a heating mode;
determining a target temperature interval to which the exhaust temperature belongs in at least three temperature intervals according to the exhaust temperature;
when the indoor unit is in a stop state, a target control mode corresponding to the target temperature interval is adopted to control the opening of the expansion valve of the indoor unit;
the controlling the opening of the internal expansion valve by adopting a target control mode corresponding to the target temperature interval comprises the following steps:
determining a target state type to which the shutdown state belongs from at least two state types;
controlling the opening of the internal engine expansion valve by adopting a target control mode corresponding to the target state type and the target temperature interval;
wherein the at least two state types include a heating shutdown state and a warming shutdown state;
and under the condition that the indoor unit is in a warm stop state, controlling the opening degree of the expansion valve of the indoor unit comprises the following steps:
controlling the opening of the internal expansion valve to be kept within a target range, and maintaining the supercooling degree of the air conditioner to be larger than or equal to a supercooling degree threshold value in the control process;
the supercooling degree is the difference between the temperature of the high-pressure side of the compressor and the temperature of the liquid outlet of the evaporator.
2. The control method according to claim 1, wherein the at least three temperature intervals include a first temperature interval, a second temperature interval, and a third temperature interval that are sequentially increased; and when the indoor unit is in a heating stop state, the step of controlling the opening of the indoor unit expansion valve by adopting a target control mode corresponding to the target temperature interval comprises the following steps:
when the target temperature interval is the first temperature interval, a first target control mode corresponding to the target temperature interval is adopted to control the internal expansion valve to keep a first opening; and/or
When the target temperature interval is the second temperature interval, a second target control mode corresponding to the target temperature interval is adopted, and the opening degree of the internal expansion valve is controlled according to the change trend of the exhaust temperature; and/or
When the target temperature interval is the third temperature interval, a third target control mode corresponding to the target temperature interval is adopted to control the opening of the internal expansion valve to be kept within a target range, and the supercooling degree of the air conditioner is maintained to be larger than or equal to a supercooling degree threshold value in the control process; the supercooling degree is the difference between the temperature of the high-pressure side of the compressor and the liquid outlet temperature of the evaporator;
and controlling the opening degree of the internal expansion valve according to the change trend of the exhaust temperature, comprising:
controlling the internal engine expansion valve to maintain a second opening degree, and detecting whether the exhaust temperature is in a rising change trend;
if so, controlling the opening of the expansion valve of the internal machine according to the temperature rising rate change trend of the exhaust temperature;
the controlling the opening of the internal expansion valve according to the temperature rising rate change trend of the exhaust temperature comprises the following steps:
under the condition that the temperature rising rate change trend is that the temperature rising rate is slow, controlling the expansion valve of the internal machine to increase the opening according to the temperature rising rate change degree of the exhaust temperature;
and in the process of controlling the opening degree of the internal expansion valve to be increased, keeping the opening degree of the internal expansion valve to be smaller than or equal to an opening degree threshold value.
3. The control method according to claim 2, wherein the controlling the opening degree of the internal expansion valve according to the temperature increase rate variation trend of the exhaust gas temperature includes:
controlling the opening degree of the internal machine expansion valve to be increased to a third opening degree and maintaining target time under the condition that the temperature rising rate change trend is that the temperature rising rate is accelerated or unchanged;
controlling the opening of the internal expansion valve to be kept within a target range, and maintaining the supercooling degree of the air conditioner to be larger than or equal to a supercooling degree threshold value in the control process; the supercooling degree is the difference between the temperature of the high-pressure side of the compressor and the temperature of the liquid outlet of the evaporator.
4. A control method according to any one of claims 2 to 3, characterized in that the at least three temperature intervals further comprise a fourth temperature interval lower than the first temperature interval; and when the indoor unit is in a heating stop state, the step of controlling the opening of the indoor unit expansion valve by adopting a target control mode corresponding to the target temperature interval comprises the following steps:
when the target temperature interval is the fourth temperature interval, a fourth target control mode corresponding to the target temperature interval is adopted to control the internal expansion valve to maintain a fourth opening;
wherein the fourth opening is smaller than the first opening.
5. A control device of a multi-split air conditioner, wherein the control device adopts the control method according to any one of claims 1 to 4, and the control device comprises:
the detection module is used for detecting the exhaust temperature of the compressor under the condition that the outdoor unit operates in a heating mode;
the determining module is used for determining a target temperature interval to which the exhaust temperature belongs in at least three temperature intervals according to the exhaust temperature;
and the control module is used for controlling the opening of the expansion valve of the indoor unit by adopting a target control mode corresponding to the target temperature interval under the condition that the indoor unit is in a stop state.
6. An air conditioner, characterized in that the air conditioner comprises: a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the control method according to any one of claims 1 to 4.
7. A readable storage medium, characterized in that it stores thereon a program or instructions that, when executed by a processor, implement the steps of the control method according to any one of claims 1 to 4.
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