CN114198866A - Multi-split air conditioner defrosting control method and multi-split air conditioner - Google Patents
Multi-split air conditioner defrosting control method and multi-split air conditioner Download PDFInfo
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- CN114198866A CN114198866A CN202111421506.6A CN202111421506A CN114198866A CN 114198866 A CN114198866 A CN 114198866A CN 202111421506 A CN202111421506 A CN 202111421506A CN 114198866 A CN114198866 A CN 114198866A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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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
- F24F11/62—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
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
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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
Abstract
The invention belongs to the technical field of air conditioners, and particularly provides a multi-online defrosting control method and a multi-online defrosting control device, aiming at solving the problems that when the multi-online defrosting is carried out efficiently, the room temperature fluctuation of a manned space can be reduced, and an unmanned room can be prevented from excessively absorbing heat due to defrosting operation. Under the condition of adopting the technical scheme, the invention can execute the corresponding defrosting working mode according to whether a person exists in the room corresponding to the indoor unit, the current indoor temperature and other conditions. By the method, when efficient defrosting is performed, the fluctuation of the space temperature of a space with a person can be reduced, and the comfort level of the user body feeling is ensured; and the situation that facilities, articles and the like in a room are damaged due to the fact that the room temperature is too low because of excessive heat absorption of an unmanned room can be effectively avoided. Meanwhile, the selection condition of the defrosting working mode can be adaptively adjusted, and the defrosting process is further optimized, so that the power consumption can be reduced, and the energy conservation and emission reduction can be realized.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a multi-split air conditioner defrosting control method and a multi-split air conditioner.
Background
When a multi-connected air conditioning (heat pump) unit (multi-connected air conditioner for short) operates in heating, particularly in an environment with relatively low temperature and relatively high humidity, a heat exchanger of an outdoor unit can generate a frosting phenomenon, and the operating capacity of the multi-connected air conditioner can be greatly reduced by frosting accumulation to a certain degree, so that the heating effect of a user is seriously influenced.
In the conventional defrosting control, all indoor units are usually switched to a cooling state, and all indoor units absorb heat in installation spaces thereof under the same condition to defrost the outdoor unit, or mainly absorb heat in specific spaces (such as current unmanned rooms, storehouses and the like) to defrost the outdoor unit. However, these control methods have disadvantages, such as when the heat absorption is equal, the temperature fluctuation of the space may be caused, and the comfort of the occupied space is reduced; when heat is preferentially absorbed in a particular space, there may be excessive heat absorption, resulting in too low a temperature in the space, causing damage to facilities and articles in the space, for example, a drop in indoor temperature below 0 ℃, possibly causing a burst of water pipes, freezing of articles, and the like. Therefore, how to reduce the fluctuation of the space temperature of the occupied space and avoid the excessive heat absorption caused by the defrosting operation to cause the too low temperature of the unoccupied space while the multi-split air conditioner is operated in the efficient defrosting mode becomes a technical problem to be solved urgently.
Accordingly, there is a need in the art for a new solution to the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problem that how to reduce the fluctuation of the room temperature of a room with people and avoid the over-low space temperature caused by the excessive heat absorption of the defrosting operation of an unmanned room when the multi-split air conditioner is operated for efficient defrosting.
In a first aspect, the present invention provides a multi-split defrosting control method, including:
detecting whether a room corresponding to each internal unit of the multi-split air conditioner is occupied or not;
in a room with people, the inner machine works to enter a first defrosting mode to execute defrosting operation;
in the unmanned room, the indoor unit performs a defrosting operation according to the real-time indoor temperature T, the first defrosting room temperature threshold T1, and the second defrosting room temperature threshold T0.
In an embodiment of the above-mentioned multiple on-line defrosting control method, the step of "in an unmanned room, the indoor unit performs a defrosting operation according to the real-time indoor temperature T, the first defrosting room temperature threshold T1 and the second defrosting room temperature threshold T0" specifically includes:
when T is greater than T1, the inner machine works to enter a second defrosting mode to execute defrosting operation;
when T1 is more than or equal to T and more than T0, the inner machine works to enter a third defrosting mode to execute defrosting operation;
when T is less than or equal to T0, the internal machine works to enter a fourth defrosting mode to execute defrosting operation;
the heat absorption load of the second defrost mode is greater than the heat absorption load of the third defrost mode, and the heat absorption load of the third defrost mode is greater than the heat absorption load of the fourth defrost mode.
In one embodiment of the above-described multiple on-line defrost control method, the method further comprises:
after the defrosting operation is finished, updating the first defrosting room temperature threshold value and/or the second defrosting room temperature threshold value according to the first indoor temperature and the second indoor temperature;
the first indoor temperature is an indoor ambient temperature of the unmanned room before the defrosting operation is performed;
the second indoor temperature is an indoor ambient temperature of the unmanned room after the defrosting operation is completed.
In an embodiment of the above-mentioned multiple on-line defrost control method, the step of updating the first defrost room temperature threshold and/or the second defrost room temperature threshold according to the first indoor temperature and the second indoor temperature after the defrost operation is completed specifically includes:
acquiring a defrosting operation room temperature change difference, wherein the calculation method of the defrosting operation room temperature change difference comprises the following steps:
ΔT＝T_Start-T_End
wherein Δ T is a defrosting operation room temperature difference value, T _ Start is the first indoor temperature, and T _ End is the second indoor temperature;
when T _ Start is greater than T1, adjusting the first defrost room temperature threshold based on the defrost operating room temperature difference;
and when T1 is more than or equal to T _ Start and more than T0, adjusting the second defrosting room temperature threshold according to the defrosting operation room temperature difference.
In an embodiment of the above-mentioned multiple on-line defrost control method, the step of adjusting the first defrost room temperature threshold according to the defrost operation room temperature difference when T _ Start > T1 specifically includes:
when the delta T is larger than T1u, the first defrosting room temperature threshold value is increased;
when T1u is more than or equal to delta T more than or equal to T1d, the first defrosting room temperature threshold value is kept unchanged;
when the delta T is less than T1d, the first defrosting room temperature threshold value is reduced;
wherein T1u is the upper limit of the difference between the defrosting room temperatures corresponding to the first defrosting room temperature threshold, and T1d is the lower limit of the difference between the defrosting room temperatures corresponding to the first defrosting room temperature threshold.
In one embodiment of the above-described multiple on-line defrost control method, when Δ T < T1d, the method further comprises:
and reducing the second defrosting room temperature threshold.
In an embodiment of the above-mentioned multiple on-line defrost control method, the step of adjusting the second defrost room temperature threshold according to the defrost operating chamber temperature difference when T1 ≧ T _ Start > T0 specifically includes:
when the delta T is larger than T0u, the second defrosting room temperature threshold value is increased;
when T0u is more than or equal to delta T more than or equal to T0d, the second defrosting room temperature threshold value is kept unchanged;
when the delta T is less than T0d, the second defrosting room temperature threshold value is reduced;
wherein T0u is the upper limit of the difference between the defrosting room temperatures corresponding to the second defrosting room temperature threshold, and T0d is the lower limit of the difference between the defrosting room temperatures corresponding to the second defrosting room temperature threshold.
In one embodiment of the above-described multiple on-line defrost control method, when Δ T > T0u, the method further comprises:
and increasing the first defrosting room temperature threshold. In an embodiment of the above-described defrosting control method for a multi-split air conditioner, "detecting whether a person is present in a room corresponding to each indoor unit of the multi-split air conditioner" includes:
detecting whether a person exists in a room corresponding to the inner machine through a human body detection sensor;
the human body detection sensor at least comprises at least one of a millimeter wave radar sensor, a laser radar sensor, an ultrasonic sensor, an infrared sensor and an image sensor.
In a second aspect, the present invention provides a multi-split air conditioner including a plurality of indoor units, a human body detection sensor, a memory, and a processor,
the human body detection sensor is used for detecting whether a person exists in a room corresponding to each internal unit of the multi-split air conditioner, and is a millimeter wave radar sensor;
the memory is used for storing a plurality of program codes;
the program code is adapted to be loaded and run by the processor to perform the method of on-line defrost control according to any of the above aspects.
Under the condition of adopting the technical scheme, the invention can execute corresponding defrosting operation according to whether a person exists in a room corresponding to the indoor unit of the multi-split air conditioner, the current indoor temperature and other conditions, and can dynamically update the first defrosting room temperature threshold and/or the second defrosting room temperature threshold according to the first indoor temperature and the second indoor temperature. By the method, when efficient defrosting is performed, the fluctuation of the space temperature of a space with a person can be reduced, and the comfort level of the user body feeling is ensured; and the situation that articles and facilities in an unmanned room are damaged due to too low room temperature caused by excessive heat absorption of the room can be effectively avoided. Meanwhile, the selection conditions of the defrosting working modes of all rooms can be adaptively adjusted, the power consumption of defrosting operation is further reduced, and energy conservation and emission reduction are realized.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a flow chart of main steps of a multi-split defrosting control method according to an embodiment of the present invention.
Fig. 2 is a flowchart of the main steps of updating the first and second defrost room temperature thresholds in accordance with an embodiment of the present invention.
Fig. 3 is a schematic diagram of a structure of a multi-split air-conditioning system according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.
The condition that the multi-split air conditioner enters the defrosting working mode is not limited, namely the condition that the multi-split air conditioner enters the defrosting working mode can be manually selected; or the multi-split air conditioner automatically enters a defrosting operation mode after meeting a certain condition, for example, the judgment is carried out according to the maximum difference value between the temperature of the outer unit coil and the indoor temperature.
Referring to fig. 1, fig. 1 is a flowchart illustrating main steps of a multi-split defrosting control method according to an embodiment of the present invention. As shown in fig. 1, the method for controlling the multi-split defrosting according to the embodiment of the present invention includes:
step S101: detecting whether a room corresponding to each internal unit of the multi-split air conditioner is occupied or not;
step S102: in a room with people, the internal machine works to enter a first defrosting mode to execute defrosting operation;
step S103: in the unmanned room, the inner machine executes defrosting operation according to the real-time indoor temperature T, the first defrosting room temperature threshold T1 and the second defrosting room temperature threshold T0;
step S1031: when T is larger than T1, the inner machine works to enter a second defrosting mode to execute defrosting operation;
step S1032: when T1 is more than or equal to T and more than T0, the inner machine works to enter a third defrosting mode to execute defrosting operation;
step S1033: and when T is less than or equal to T0, the internal machine works to enter a fourth defrosting mode to execute defrosting operation.
In step S101, whether or not a person is present in a room corresponding to the indoor unit is detected by the human body detection sensor. In the present embodiment, the human body detection sensor is a millimeter wave radar sensor. The millimeter wave radar sensor has the advantages of mature technology, high human body detection accuracy, capability of better protecting the privacy of a user and the like, and is a technical scheme with high cost performance.
In addition, whether a person is present in a room may be detected by one of other human body detection sensors such as a laser radar sensor, an ultrasonic sensor, an infrared sensor, and an image sensor. Furthermore, the detection of whether people exist in the room can be carried out in a mode of combining a plurality of human body detection sensors. For example, in a public space, some rooms are provided with monitoring cameras, and at the moment, whether people exist in the rooms or not can be detected through video images collected by the monitoring cameras and the millimeter wave radar sensors on the indoor units.
It should be noted that the human body detection sensor may be a component of the internal machine itself, or may be a sensor network installed independently, or a combination of the two methods, and a person skilled in the art may select a suitable technical scheme for detecting whether a person is in a room where the internal machine is located according to an actual situation.
If people are in the room where the indoor unit is located, in order to ensure the comfort of the human body, the situation that the indoor temperature is too low or the fluctuation of the indoor temperature is too severe needs to be avoided, step S102 is executed, and the indoor unit works in the first defrosting mode. At the moment, the fans of the inner machine can be set to be closed, the electronic expansion valve is closed, and the manned room does not absorb heat through the inner machine; or the internal fan is closed, the opening degree of the electronic expansion valve is reduced, and the room absorbs heat naturally, so that heat is absorbed from the room with people as little as possible.
If the room where the indoor unit is located is unmanned, the basic principle of indoor unit control is to preferentially and reasonably absorb heat in the unmanned room on the premise of ensuring the safety of indoor facilities, articles and the like so as to accelerate the defrosting process of the multi-split air conditioner. For this purpose, in step S103 of the present embodiment, a first defrosting room temperature threshold and a second defrosting room temperature threshold are set for the unmanned room, and the first defrosting room temperature threshold is greater than the second defrosting room temperature threshold.
The purpose of setting the first defrosting room temperature threshold is to quickly absorb heat from the indoor unit when the indoor temperature is around the value, to accelerate the defrosting operation, and to dynamically adjust (reduce) the heat absorption load when the room temperature is lowered.
The purpose of setting the second defrost room temperature threshold is to prevent the room temperature from being excessively low due to excessive heat absorption by the defrost operation. Therefore, the second defrost room temperature threshold needs to be higher than a safe temperature to ensure that indoor facilities, goods are not damaged due to too low a temperature.
As an example, a room has a water container and a water supply line, and the freezing temperature of water is 0 ℃ at standard atmospheric pressure, at which time the room has a safe temperature of 0 ℃. Therefore, in order to ensure the safety of facilities and articles in the room, the second defrosting room temperature threshold value can be set to be 5 ℃ and higher than the freezing point temperature of water, and a certain margin is left. The first defrost room temperature threshold may be set at 16 deg.c, which is farther from the freezing point temperature of water, and may perform an enhanced heat absorption.
In the embodiment, the inner machine measures the real-time indoor temperature of the unmanned room through a standard ring temperature sensor.
When the real-time indoor temperature is greater than the first defrosting room temperature threshold (T is greater than T1), the indoor temperature of the current unmanned room is higher and is within the safe range of the indoor temperature, and even if the heat absorption is strengthened, the heat absorption load is larger, and the harm of the over-low indoor temperature is not easy to occur. At this time, step S1031 is executed, the internal unit operates to enter the second defrosting mode to perform defrosting operation, and as an example, the internal unit turns on the electronic expansion valve, turns on the fan, and performs enhanced heat absorption. The opening degree of the electronic expansion valve and the wind speed of the fan can be set according to actual conditions, for example, the opening degree of the electronic expansion valve is set to be 50%, and the wind speed of the fan is medium.
When the real-time indoor temperature is less than or equal to the first defrosting room temperature threshold value and is greater than the second defrosting room temperature threshold value (T1 is more than or equal to T0), the situation that the room temperature of the current unmanned room is not suitable for strengthening heat absorption is shown, and if the heat absorption is too fast, the room temperature is possibly too low, so the heat absorption load needs to be controlled. At this time, step S1032 is executed, the internal unit operates to enter the third defrosting mode to perform a defrosting operation, and as an example, the internal unit may control the opening degree of the electronic expansion valve according to an actual situation, turn off the fan, and perform natural heat absorption.
When the real-time indoor temperature is less than or equal to the second defrosting room temperature threshold value (T is less than or equal to T0), the indoor temperature is in the adjacent area of the safe room temperature, and the heat absorption needs to be stopped. At this time, step S1033 is executed, and the indoor unit operates to enter a fourth defrosting mode to perform a defrosting operation, for example, the indoor unit turns off the electronic expansion valve, turns off the fan, and stops absorbing heat. At this time, if the indoor temperature is detected to be still continuously reduced, the inner machine can start the auxiliary heating function to prevent the indoor temperature from being too low to damage facilities and articles in the room.
In summary, according to the method of the present invention, when the indoor unit of the unmanned room is operated to defrost, the setting of the operation mode should follow the following principle, the heat absorption load of the second defrosting mode should be greater than the heat absorption load of the third defrosting mode, the heat absorption load of the third defrosting mode should be greater than the heat absorption load of the fourth defrosting mode, and the specific control parameters can be set by those skilled in the art according to the actual situation.
After the defrosting operation is completed, further, according to the indoor environment temperature (first indoor temperature T _ Start) of the unmanned room before the defrosting operation is performed and the indoor environment temperature (second indoor temperature T _ End) after the defrosting operation is completed, the first defrosting room temperature threshold and/or the second defrosting room temperature threshold are/is updated, the updated first defrosting room temperature threshold and the updated second defrosting room temperature threshold can be used as control parameters of the next defrosting operation, and the first defrosting room temperature threshold and the second defrosting room temperature threshold are continuously optimized according to the environment and the actual conditions of the room, so that the safer, more efficient and more energy-saving multi-split air-conditioning defrosting operation is realized.
Turning next to fig. 2, fig. 2 is a flow chart of the main steps of updating the first and second defrost room temperature thresholds according to an embodiment of the present invention.
In step S201, a difference Δ T between changes in room temperature during the defrosting operation is calculated from the first indoor temperature and the second indoor temperature, and the difference Δ T between changes in room temperature during the defrosting operation is calculated by:
ΔT＝T_Start-T_End。
the method for adjusting the first defrosting room temperature threshold and the second defrosting room temperature threshold includes that whether the first defrosting room temperature threshold or the second defrosting room temperature threshold is adjusted at this time is determined by checking the interval range of the first indoor temperature of the unmanned room before defrosting operation is executed relative to the first defrosting room temperature threshold and the second defrosting room temperature threshold; and then determining how to adjust according to the change difference of the room temperature of the defrosting operation, wherein the specific implementation process is as follows.
When the first indoor temperature is greater than the first defrost room temperature threshold (T _ Start > T1), step S202 is executed to adjust the first defrost room temperature threshold according to the defrost operation room temperature difference, which is determined by determining how to adjust the first defrost room temperature threshold by determining that the defrost operation room temperature difference is within a preset value range of parameters T1u and T1 d. Wherein, T1u is the upper limit of the difference between the defrosting room temperatures corresponding to the first defrosting room temperature threshold, and T1d is the lower limit of the difference between the defrosting room temperatures corresponding to the first defrosting room temperature threshold. As an example, T1d may be set to 2 deg.C, T1u may be set to 8 deg.C
When the difference between the defrosting operation room temperatures is greater than the upper limit of the difference between the defrosting operation room temperatures corresponding to the first defrosting room temperature threshold (Δ T > T1u), it indicates that the indoor temperature is decreased too much during the defrosting process, the process of performing enhanced heat absorption is excessive, and the original first defrosting room temperature threshold is low, so step S2021 can be performed to increase the first defrosting room temperature threshold, so that the time of the enhanced heat absorption stage is reduced during the next defrosting operation.
When the temperature difference of the defrosting operation chamber is smaller than or equal to the upper limit of the difference of the defrosting operation chamber temperature corresponding to the first defrosting chamber temperature threshold and is greater than or equal to the lower limit of the difference of the defrosting operation chamber temperature corresponding to the first defrosting chamber temperature threshold (T1u is greater than or equal to Δ T is greater than or equal to T1d), it is indicated that the setting of the first defrosting chamber temperature threshold is more matched with the current actual situation, and therefore step S2022 is executed without adjusting the first defrosting chamber temperature threshold.
When the difference between the defrosting operation room temperatures is smaller than the lower limit of the difference between the defrosting operation room temperatures (Δ T < T1d) corresponding to the first defrosting room temperature threshold, it indicates that the change of the room temperatures during the defrosting process is not large, so step S2023 is executed to lower the first defrosting room temperature threshold, so that the time of the enhanced heat absorption phase can be increased during the next defrosting operation. Furthermore, the second defrosting room temperature threshold value can be simultaneously reduced, and the influence on the natural heat absorption stage time is reduced, so that the defrosting efficiency is further improved.
When the first indoor temperature is less than or equal to the first defrosting room temperature threshold and greater than the second defrosting room temperature threshold (T1 ≥ T _ Start > T0), step S203 is executed to adjust the second defrosting room temperature threshold according to the defrosting operation chamber temperature difference, which is specifically determined by determining how to adjust the second defrosting room temperature threshold by determining that the defrosting operation chamber temperature difference is within the preset numerical range of the parameters T0u and T0 d. Wherein, T0u is the upper limit of the difference between the defrosting room temperatures corresponding to the second defrosting room temperature threshold, and T0d is the lower limit of the difference between the defrosting room temperatures corresponding to the second defrosting room temperature threshold. As an example, T0d may be set to 2 deg.C and T0u may be set to 6 deg.C.
When the temperature difference of the defrosting operation chamber is greater than the difference upper limit of the defrosting operation room temperature (delta T is greater than T0u) corresponding to the second defrosting room temperature threshold, it is indicated that the indoor temperature is excessively reduced in the defrosting process, the natural heat absorption process is executed a lot, and the original second defrosting room temperature threshold is low, so that the step S2031 can be executed, the second defrosting room temperature threshold is increased, the time of the natural heat absorption stage is shortened in the next defrosting operation, the heat absorption stopping mode is started as early as possible, and the indoor temperature is ensured to be higher than the safe temperature. Furthermore, the first defrosting room temperature threshold can be simultaneously increased, the process of strengthening heat absorption is reduced, and the influence on the time of a natural heat absorption stage is reduced, so that the total heat absorption amount of the room is reduced during the next defrosting operation, and the safety of indoor facilities and articles is ensured.
When the defrosting operation chamber temperature difference is less than or equal to the upper limit of the defrosting operation chamber temperature difference corresponding to the second defrosting chamber temperature threshold and is greater than or equal to the lower limit of the defrosting operation chamber temperature difference corresponding to the second defrosting chamber temperature threshold (T0u is greater than or equal to Δ T is greater than or equal to T0d), it is indicated that the original second defrosting chamber temperature threshold is set to be more matched with the current actual situation, and therefore step S2032 is executed without adjusting the second defrosting chamber temperature threshold.
When the difference between the defrosting operation room temperatures is smaller than the lower limit of the difference between the defrosting operation room temperatures corresponding to the second defrosting room temperature threshold (Δ T < T0d), it indicates that the change of the room temperatures is not large during the defrosting process, so step S2033 is executed to lower the second defrosting room temperature threshold, and the time of the natural heat absorption phase is increased during the next defrosting operation.
It should be noted that, in the present embodiment, the temperature threshold for determining the indoor unit defrosting operation mode is set to two, that is, the first defrosting room temperature threshold and the second defrosting room temperature threshold. The technical personnel in the field can also set more defrosting room temperature threshold values according to the actual situation, and correspondingly, the control method of the indoor unit defrosting operation in the multi-online defrosting work within a plurality of defrosting room temperature threshold value intervals is further refined. Such modifications are intended to fall within the scope of the present invention without departing from the principles thereof.
Further, the present invention also provides a multi-split air conditioner, as shown in fig. 3, which is a schematic diagram of a composition structure of the multi-split air conditioner according to the embodiment of the present invention, and the multi-split air conditioner 3 includes a plurality of internal units 31, a human body detection sensor 32, a memory 33, and a processor 34.
The plurality of indoor units 31 includes n indoor units, which are numbered as: the indoor units A31a, the indoor units B31B, … and the indoor unit N31N detect the ambient temperature of the room where each indoor unit is located through the ring temperature sensor which is standard for each indoor unit.
The human body detection sensor 32 is configured to detect whether a person is in a room corresponding to each internal unit of the multi-split air conditioner 3, and preferably, the human body detection sensor 32 is a millimeter wave radar sensor installed on each internal unit of the multi-split air conditioner 3.
The memory 33 may be configured to store program code for performing the multi-online defrost control method of the above-described method embodiments, which may be loaded and executed by the processor 34 to implement the multi-online defrost control method described above. For convenience of explanation, only the parts related to the embodiments of the present invention are shown, and details of the specific techniques are not disclosed. The memory 33 may be a storage device formed of various electronic devices, and optionally, the memory 33 is a non-transitory writable and readable storage medium in the embodiment of the present invention.
Those of skill in the art will appreciate that the method steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of electronic hardware and software. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It should be noted that the terms "first," "second," "third," "fourth," and the like in the description and in the claims of the invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing or implying any particular order or sequence. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
It should be noted that in the description of the present application, the term "a and/or B" indicates all possible combinations of a and B, such as a alone, B alone, or a and B.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A multi-online defrosting control method is characterized by comprising the following steps:
detecting whether a room corresponding to each internal unit of the multi-split air conditioner is occupied or not;
in a room with people, the inner machine works to enter a first defrosting mode to execute defrosting operation;
in the unmanned room, the indoor unit performs a defrosting operation according to the real-time indoor temperature T, the first defrosting room temperature threshold T1, and the second defrosting room temperature threshold T0.
2. The multi-online defrosting control method according to claim 1, wherein the step of performing a defrosting operation of the indoor unit according to the real-time indoor temperature T, the first defrosting room temperature threshold T1 and the second defrosting room temperature threshold T0 in an unmanned room specifically includes:
when T is greater than T1, the inner machine works to enter a second defrosting mode to execute defrosting operation;
when T1 is more than or equal to T and more than T0, the inner machine works to enter a third defrosting mode to execute defrosting operation;
when T is less than or equal to T0, the internal machine works to enter a fourth defrosting mode to execute defrosting operation;
the heat absorption load of the second defrost mode is greater than the heat absorption load of the third defrost mode, and the heat absorption load of the third defrost mode is greater than the heat absorption load of the fourth defrost mode.
3. The multi-on-line defrost control method as claimed in claim 1, further comprising:
after the defrosting operation is finished, updating the first defrosting room temperature threshold value and/or the second defrosting room temperature threshold value according to the first indoor temperature and the second indoor temperature;
the first indoor temperature is an indoor ambient temperature of the unmanned room before the defrosting operation is performed;
the second indoor temperature is an indoor ambient temperature of the unmanned room after the defrosting operation is completed.
4. The multi-online defrosting control method according to claim 3, wherein the step of updating the first defrosting room temperature threshold and/or the second defrosting room temperature threshold according to the first indoor temperature and the second indoor temperature after the defrosting operation is completed specifically includes:
acquiring a defrosting operation room temperature change difference, wherein the calculation method of the defrosting operation room temperature change difference comprises the following steps:
ΔT＝T_Start-T_End
wherein Δ T is a defrosting operation room temperature difference value, T _ Start is the first indoor temperature, and T _ End is the second indoor temperature;
when T _ Start is greater than T1, adjusting the first defrost room temperature threshold based on the defrost operating room temperature difference;
and when T1 is more than or equal to T _ Start and more than T0, adjusting the second defrosting room temperature threshold according to the defrosting operation room temperature difference.
5. The multi-online defrosting control method according to claim 4, wherein the step of adjusting the first defrosting room temperature threshold according to the defrosting operation room temperature difference when T _ Start > T1 specifically includes:
when the delta T is larger than T1u, the first defrosting room temperature threshold value is increased;
when T1u is more than or equal to delta T more than or equal to T1d, the first defrosting room temperature threshold value is kept unchanged;
when the delta T is less than T1d, the first defrosting room temperature threshold value is reduced;
wherein T1u is the upper limit of the difference between the defrosting room temperatures corresponding to the first defrosting room temperature threshold, and T1d is the lower limit of the difference between the defrosting room temperatures corresponding to the first defrosting room temperature threshold.
6. The multi-on-line defrost control method as claimed in claim 5, wherein when Δ T < T1d, the method further comprises:
and reducing the second defrosting room temperature threshold.
7. The multi-online defrosting control method according to claim 4, wherein the step of adjusting the second defrosting room temperature threshold according to the defrosting operation chamber temperature difference when T1 is more than or equal to T _ Start > T0 specifically comprises:
when the delta T is larger than T0u, the second defrosting room temperature threshold value is increased;
when T0u is more than or equal to delta T more than or equal to T0d, the second defrosting room temperature threshold value is kept unchanged;
when the delta T is less than T0d, the second defrosting room temperature threshold value is reduced;
wherein T0u is the upper limit of the difference between the defrosting room temperatures corresponding to the second defrosting room temperature threshold, and T0d is the lower limit of the difference between the defrosting room temperatures corresponding to the second defrosting room temperature threshold.
8. The multi-online defrosting control method according to claim 7, wherein when Δ T > T0u, the method further comprises:
and increasing the first defrosting room temperature threshold.
9. The multi-split defrosting control method according to claim 1, wherein the method of detecting whether a person is in a room corresponding to each indoor unit of the multi-split air conditioner comprises:
detecting whether a person exists in a room corresponding to the inner machine through a human body detection sensor;
the human body detection sensor at least comprises at least one of a millimeter wave radar sensor, a laser radar sensor, an ultrasonic sensor, an infrared sensor and an image sensor.
10. A multi-split air conditioner is characterized in that the multi-split air conditioner comprises a plurality of indoor units, a human body detection sensor, a memory and a processor,
the human body detection sensor is used for detecting whether a person exists in a room corresponding to each internal unit of the multi-split air conditioner, and is a millimeter wave radar sensor;
the memory is used for storing a plurality of program codes;
the program code, when executed by the processor, implements the on-line defrost control method of any of claims 1 to 9.
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