CN110332648B - Control method and device of electronic expansion valve and multi-connected air conditioning system - Google Patents
Control method and device of electronic expansion valve and multi-connected air conditioning system Download PDFInfo
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- CN110332648B CN110332648B CN201910660697.8A CN201910660697A CN110332648B CN 110332648 B CN110332648 B CN 110332648B CN 201910660697 A CN201910660697 A CN 201910660697A CN 110332648 B CN110332648 B CN 110332648B
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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
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention provides a control method and a control device of an electronic expansion valve and a multi-connected air conditioning system, wherein the control method comprises the following steps: s1, detecting the temperature T of the inlet thick pipe of the standby indoor unitB thick pipeAnd outlet tubule temperature TB thin tube(ii) a S2, detecting the opening P of the electronic expansion valve of the starting indoor unitA(ii) a S3, detecting outdoor exhaust temperature TExhaust of gases(ii) a And S4, establishing a control strategy of the electronic expansion valve of the standby indoor unit according to the data detected in the steps S1-S3. According to the invention, under the condition of ensuring the balance of the multi-connected air-conditioning system in the heating mode, the noise generated by the standby indoor unit is reduced to the minimum, and the noise of refrigerant flowing in the room can not be heard.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of an electronic expansion valve and a multi-connected air conditioning system.
Background
A multi-air conditioning system usually includes one or more outdoor units driving a plurality of indoor units, each of which heats one room. At present, aiming at a multi-connected air conditioning system, when a user only opens one indoor unit for heating, other indoor units keep a shutdown state, and as a compressor of the outdoor unit works, in order to avoid high-voltage faults, the stable operation of the system is ensured, electronic expansion valves of other shutdown indoor units cannot be completely closed, but a smaller standby opening degree is kept, for example, 40-60 steps are carried out, so that the balance of the air conditioning system is ensured, but often, as the standby expansion valves have certain opening degrees, a small amount of refrigerant flows through the standby indoor units to generate noise in the operation process of the actual complete machine, the experience effect of customers is influenced, and the after-sale complaints are caused.
Disclosure of Invention
The invention aims to provide a control method and a control device of an electronic expansion valve and a multi-connected air conditioning system, which can reduce the noise generated by a standby indoor unit to the minimum and can not hear the noise of refrigerant flowing indoors under the condition of ensuring the balance of the multi-connected air conditioning system in a heating mode.
In order to solve the problems, the invention adopts the following technical scheme:
according to an aspect of the present invention, there is provided a control method of an electronic expansion valve, including the steps of:
s1, detecting the temperature T of the inlet thick pipe of the standby indoor unitB thick pipeAnd outlet tubule temperature TB thin tube；
S2, detecting the opening P of the electronic expansion valve of the starting indoor unitA；
S3, detecting outdoor exhaust temperature TExhaust of gases；
And S4, establishing a control strategy of the electronic expansion valve of the standby indoor unit according to the data detected in the steps S1-S3.
In the heating mode, under the condition of ensuring the balance of the multi-connected air conditioning system, the noise generated by the standby indoor unit is reduced to the minimum.
In some embodiments of the present invention, in step S4,
when the data detected in the steps S1-S3 meet the condition C, performing opening control on the electronic expansion valve of the indoor unit to be treated; when the data detected in the steps S1-S3 meet the condition D, carrying out turn-off control on the electronic expansion valve of the indoor unit to be treated; when the data detected in steps S1 to S3 neither satisfy condition C nor condition D, the opening degree of the electronic expansion valve of the standby indoor unit is maintained.
In some embodiments of the present invention, it is preferred,
the condition C is as follows: t isB thick pipe-TB thin tube≥C1℃、PA≥C2、TExhaust of gases≥C3℃；
The condition D is as follows: t isB thick pipe-TB thin tube≤D1℃、PA≤D2、TExhaust of gases≤D3℃。
In certain embodiments of the present invention, step S4 is performed according to the following process: judging whether the condition C is satisfied, if so, executing a valve opening control process, and opening the electronic expansion valve of the standby indoor unit at a certain rate; if not, judging whether the condition D is satisfied, if so, executing a valve closing control process, and closing the opening of the electronic expansion valve of the standby indoor unit at a certain rate; if not, the opening degree of the electronic expansion valve of the standby indoor unit is kept unchanged.
In some embodiments of the invention, the control method further comprises:
and continuously repeating the steps S1-S4 to continuously control and adjust the opening degree of the electronic expansion valve of the indoor unit to be treated.
According to another aspect of the present invention, there is also provided a control apparatus for an electronic expansion valve, comprising:
the thick pipe sensor is used for detecting the temperature of an inlet thick pipe of the standby indoor unit;
the thin tube sensor is used for detecting the temperature of an outlet thin tube of the standby indoor unit;
the electronic expansion valve opening degree detection module is used for detecting the opening degree of an electronic expansion valve of the starting indoor unit;
an exhaust temperature sensor for detecting an outdoor exhaust temperature;
and the control module is used for making a control strategy of the electronic expansion valve of the standby indoor unit according to the inlet thick pipe temperature, the outlet thin pipe temperature, the opening degree of the electronic expansion valve of the starting indoor unit and the outdoor exhaust temperature of the standby indoor unit.
In some embodiments of the present invention, the number of the thick pipe sensors, the thin pipe sensors, and the electronic expansion valve opening degree detection modules is multiple, and each indoor unit is configured with one thick pipe sensor, one thin pipe sensor, and one electronic expansion valve opening degree detection module.
In some embodiments of the invention, the control module comprises:
the first judgment module is used for judging whether the following conditions are met or not: t isB thick pipe-TB thin tube≥C1℃、PA≥C2、TExhaust of gases≥C3℃；
The second judgment module is used for judging whether the following conditions are met or not: t isB thick pipe-TB thin tube≤D1℃、PA≤D2、TExhaust of gases≤D3℃。
In certain embodiments of the present invention, the control strategy comprises the following instructions:
a valve opening command: the opening of an electronic expansion valve of the standby indoor unit is increased at a certain rate;
valve closing command: the opening of an electronic expansion valve of the standby indoor unit is reduced at a certain rate;
maintain invariant instruction: the opening degree of the electronic expansion valve of the standby indoor unit is kept unchanged.
According to another aspect of the invention, a multi-connected air conditioning system is also provided, which comprises the control device of the electronic expansion valve.
Drawings
Fig. 1 is a simple diagram of the working principle and structure of a multi-connected air conditioning system.
Fig. 2 is a step diagram of a control method of an electronic expansion valve according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart illustrating a control method of the electronic expansion valve according to the embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a control device of an electronic expansion valve according to an embodiment of the present invention.
Description of reference numerals:
1-a compressor; 2-an indoor unit; 3, an outdoor unit; 4-an electronic expansion valve; 5-a tubule sensor; 6-a wide tube sensor; 7-exhaust gas temperature sensor.
Detailed Description
Before introducing the present invention, first, the working principle of the multi-connected air conditioning system is explained, taking a one-driving-two type as an example, as shown in fig. 1, the multi-connected air conditioning system includes a compressor 1, two indoor units 2, and an outdoor unit 3, and the operation process is as follows: during heating, the refrigerant flows out of the compressor 1, flows into the thick pipe, flows out of the thick pipe, passes through the heat exchanger of the indoor unit 2, air passes through the surface of the heat exchanger under the action of the fan, the refrigerant is changed from a gas state to a liquid state in the heat exchanger, the released heat is absorbed by the air passing through the surface of the heat exchanger, and the air is changed into hot air to be blown into a room; the liquid refrigerant flows out from the heat exchanger of the indoor unit 2, passes through the thin tube and the electronic expansion valve 4, and then flows into the heat exchanger of the outdoor unit 3, under the action of the fan, the air passes through the surface of the heat exchanger, the refrigerant changes from liquid state to gas state, the heat in the air is absorbed by the refrigerant, and the gas refrigerant flows back to the compressor 1, thereby circulating and realizing the heating process. During refrigeration, the flowing direction of the refrigerant is changed, so that the refrigerant flows into the outdoor unit 3 and then flows into the indoor unit 2, and the refrigeration process is realized.
The connecting pipe between the compressor 1 and the indoor unit 2 comprises a thick pipe, a thick pipe sensor 6 is arranged on the thick pipe, the thick pipe sensor 6 can detect the temperature of the thick pipe, the connecting pipe between the indoor unit 2 and the outdoor unit 3 comprises a thin pipe, a thin pipe sensor 5 is arranged on the thin pipe, and the thin pipe sensor 5 can detect the temperature of the thin pipe; an electronic expansion valve 4 is also arranged between the indoor unit 2 and the outdoor unit 3.
When a user only opens one indoor unit for heating, other indoor units are kept in a shutdown state, the compressor of the outdoor unit works to avoid high-voltage faults and ensure stable operation of the system, and the electronic expansion valves of other shutdown indoor units cannot be completely closed, but a smaller standby opening degree is kept, for example, 40-60 steps, so as to ensure balance of the air conditioning system.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In an embodiment of the present invention, there is provided a control method of an electronic expansion valve, as shown in fig. 2, including the steps of:
s1, detecting the temperature T of the inlet thick pipe of the standby indoor unitB thick pipeAnd outlet tubule temperature TB thin tube；
The control method of the electronic expansion valve is carried out in a heating mode, and during heating, for an indoor unit, a thick pipe side belongs to an inlet side, and a thin pipe side belongs to an outlet side, and the inlet thick pipe temperature and the outlet thin pipe temperature of the indoor unit in a standby state are detected respectively.
S2, detecting the opening P of the electronic expansion valve of the starting indoor unitA；
In step S2, the opening degrees of the electronic expansion valves of all the indoor units in the on state are detected.
S3, detecting outdoor exhaust temperature TExhaust of gases；
As shown in fig. 1, a discharge temperature sensor 7 is provided near the compressor 1 to detect the discharge temperature outdoors.
And S4, establishing a control strategy of the electronic expansion valve of the standby indoor unit according to the data detected in the steps S1-S3.
In this step, the control scenario for the electronic expansion valve includes three types: the control method comprises the following steps of valve opening control, valve closing control and maintenance, and correspondingly, the control strategy comprises the following steps: when the data detected in the steps S1-S3 meet the condition C, performing opening control on the electronic expansion valve of the indoor unit to be treated; when the data detected in the steps S1-S3 meet the condition D, carrying out turn-off control on the electronic expansion valve of the indoor unit to be treated; when the data detected in steps S1 to S3 neither satisfy condition C nor condition D, the opening degree of the electronic expansion valve of the standby indoor unit is maintained.
The condition C described above is: t isB thick pipe-TB thin tube≥C1℃、PA≥C2、TExhaust of gases≥C3DEG C; the condition D is: t isB thick pipe-TB thin tube≤D1℃、PA≤D2、TExhaust of gases≤D3℃。
Through the control scheme, the problem of noise caused by the fact that the opening of the standby valve is too large through closing valve control when the system running load is small (the noise generated by the standby refrigerant flowing can be obviously heard) can be effectively solved. When the system has heavy operation load (the noise generated by the flow of the standby refrigerant needs to be unloaded by a normally open large valve step because of the load increase, and the problem of obvious refrigerant flow noise does not exist), the stable operation of the air conditioner is ensured by valve opening control.
The control flow of the electronic expansion valve is described in detail below, as shown in fig. 3, taking one to three as an example, and taking only one indoor unit as the power-on heating mode (a unit), and two other indoor units (B1 unit and B2 unit) are both in the power-off mode to illustrate the control method, specifically as follows:
step S1, detecting the temperature (T) of the inlet thick pipe of the standby indoor unit B1B1 heavy pipe) Standby outlet tubule temperature (T) of indoor unit B1B1 tubule) (ii) a Detecting the temperature (T) of the inlet thick pipe of the standby indoor unit B2B2 heavy pipe) Standby outlet tubule temperature (T) of indoor unit B2B2 tubule)；
Step S2, detecting the opening (P) of the electronic expansion valve of the indoor unit AA)；
Step S3, detecting outdoor exhaust temperature TExhaust of gases；
Step S4, determining whether the following conditions hold: t isB1 heavy pipe-TB1 tubule≥50℃、PANot less than 450 steps, TExhaust of gasesThe temperature is more than or equal to 90 ℃, if so, an opening control process is executed, the opening of the electronic expansion valve of the standby indoor unit B1 is controlled to be opened according to the speed of 1 step/60 s, and the maximum step number of the standby indoor unit B1 does not exceed 40 steps; if not, judging whether the following conditions are met: t isB1 heavy pipe-TB1 tubule≤25℃、PALess than or equal to 350 steps, TExhaust of gasesIf the temperature is less than or equal to 80 ℃, executing a valve closing control process, and closing and controlling the opening of the electronic expansion valve of the standby indoor unit B1 at a rate of 1 step/60 s, wherein the minimum step number is not less than 20 steps; if not, the opening degree of the electronic expansion valve of the standby indoor unit B1 is maintained.
Judging whether the following conditions are met: t isB2 heavy pipe-TB2 tubule≥50℃、PANot less than 450 steps, TExhaust of gasesNot less than 90 ℃, if yes, executing a valve opening control process, and waiting in a roomThe opening degree of an expansion valve of the indoor machine B2 is controlled to be increased at the speed of 1 step/60 s, and the maximum step number of the indoor machine B2 does not exceed 40 steps; if not, judging whether the following conditions are met: t isB2 heavy pipe-TB2 tubule≤25℃、PALess than or equal to 350 steps, TExhaust of gasesIf the opening degree of the expansion valve is less than or equal to 80 ℃, executing a valve closing control process, and closing and controlling the opening degree of the expansion valve of the standby B2 at a rate of 1 step/60 s, wherein the minimum step number is not less than 20 steps; if not, the opening degree of the electronic expansion valve of the standby indoor unit B2 is maintained.
In an embodiment of the present invention, there is further provided a control device for an electronic expansion valve, as shown in fig. 4, including: the device comprises a thick pipe sensor 6, a thin pipe sensor 5, an electronic expansion valve opening degree detection module, an exhaust temperature sensor 7 and a control module.
The control system comprises a thick pipe sensor 6, a thin pipe sensor 5, an electronic expansion valve opening degree detection module, an exhaust temperature sensor 7 and a control module, wherein the thick pipe sensor 6 is used for detecting the temperature of an inlet thick pipe of a standby indoor unit, the thin pipe sensor 5 is used for detecting the temperature of an outlet thin pipe of the standby indoor unit, the electronic expansion valve opening degree detection module is used for detecting the opening degree of an electronic expansion valve of a starting indoor unit, the exhaust temperature sensor 7 is used for detecting the outdoor exhaust temperature, and the control module is used for formulating a control strategy of the electronic expansion valve of the standby indoor unit according to the temperature of the inlet thick pipe of the standby indoor unit, the temperature of the outlet thin pipe, the opening degree of the electronic expansion valve of the starting indoor unit and the outdoor exhaust temperature.
Specifically, the number of the wide pipe sensors 6 is equal to the number of the standby indoor units, and one wide pipe sensor 6 is disposed in each standby indoor unit. Similarly, there are a plurality of capillary tube sensors 5, the number of which is equal to the number of standby indoor units, and one capillary tube sensor 5 is provided for each standby indoor unit.
The control module comprises a first judging module and a second judging module, and the first judging module is used for judging whether the following conditions are met: t isB1 heavy pipe-TB1 tubule≥50℃、PANot less than 450 steps, TExhaust of gasesAnd at most 90 ℃, executing a corresponding instruction according to the judgment result, specifically, if the judgment result is yes, executing a valve opening control instruction, and controlling the opening degree of an electronic expansion valve of the standby indoor unit B1 to be opened at a rate of 1 step/60 s, wherein the maximum step number of the standby indoor unit B1 is not more than40 steps; the second judging module is used for judging whether the following conditions are met or not: t isB1 heavy pipe-TB1 tubule≤25℃、PALess than or equal to 350 steps, TExhaust of gasesExecuting a corresponding instruction according to the judgment result at the temperature of less than or equal to 80 ℃, specifically executing a valve closing control instruction if the judgment result is yes, and closing and controlling the opening of the electronic expansion valve of the standby indoor unit B1 at the speed of 1 step/60 s, wherein the minimum step number is not less than 20 steps; and when the judgment result of the first judgment module is negative and the judgment result of the second judgment module is negative, executing an instruction that the opening degree of the electronic expansion valve of the standby indoor unit B1 is kept unchanged.
The control and regulation are continuously carried out through three control and regulation modes of opening a valve, closing the valve and maintaining the valve unchanged, and the noise of the refrigerant flowing in the standby indoor unit is reduced to the minimum on the premise of stable operation of the air conditioner.
In an embodiment of the present invention, a multi-connected air conditioning system is further provided, which includes the control device of the electronic expansion valve.
According to the invention, under the condition of ensuring the balance of the multi-connected air-conditioning system in the heating mode, the noise generated by the standby indoor unit is reduced to the minimum, and the noise of refrigerant flowing in the room can not be heard.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A control method of an electronic expansion valve, characterized by comprising the steps of:
s1, detecting the temperature T of the inlet thick pipe of the standby indoor unitB thick pipeAnd outlet tubule temperature TB thin tube；
S2, detecting the opening P of the electronic expansion valve of the starting indoor unitA；
S3, detecting outdoor exhaust temperature TExhaust of gases；
S4, making a control strategy of the electronic expansion valve of the standby indoor unit according to the data detected in the steps S1-S3;
the connecting pipe between the compressor and the indoor unit is a thick pipe, and the connecting pipe between the indoor unit and the outdoor unit is a thin pipe;
in step S4, when the data detected in steps S1 to S3 satisfy condition C, performing an increase control on the electronic expansion valve of the indoor unit to be operated; when the data detected in the steps S1-S3 meet the condition D, carrying out turn-off control on the electronic expansion valve of the indoor unit to be treated; when the data detected in steps S1 to S3 neither satisfy condition C nor condition D, the opening degree of the electronic expansion valve of the standby indoor unit is maintained unchanged;
wherein the condition C is: t isB thick pipe-TB thin tube≥C1℃、PA≥C2、TExhaust of gases≥C3DEG C; the condition D is as follows: t isB thick pipe-TB thin tube≤D1℃、PA≤D2、TExhaust of gases≤D3℃；
Wherein, the step S4 is executed according to the following procedure: judging whether the condition C is satisfied, if so, executing a valve opening control process, and opening the electronic expansion valve of the standby indoor unit at a certain rate; if not, judging whether the condition D is satisfied, if so, executing a valve closing control process, and closing the opening of the electronic expansion valve of the standby indoor unit at a certain rate; if not, the opening degree of the electronic expansion valve of the standby indoor unit is kept unchanged.
2. The control method according to claim 1, characterized by further comprising:
and continuously repeating the steps S1-S4 to continuously control and adjust the opening degree of the electronic expansion valve of the indoor unit to be treated.
3. A control apparatus for an electronic expansion valve, for implementing the control method according to any one of claims 1-2, comprising:
the thick pipe sensor (6) is used for detecting the temperature of an inlet thick pipe of the standby indoor unit;
the tubule sensor (5) is used for detecting the outlet tubule temperature of the standby indoor unit;
the electronic expansion valve opening degree detection module is used for detecting the opening degree of an electronic expansion valve of the starting indoor unit;
an exhaust temperature sensor (7) for detecting an outdoor exhaust temperature;
the control module is used for making a control strategy of the electronic expansion valve of the standby indoor unit according to the inlet thick pipe temperature, the outlet thin pipe temperature, the opening degree of the electronic expansion valve of the starting indoor unit and the outdoor exhaust temperature of the standby indoor unit;
the connecting pipe between the compressor and the indoor unit is a thick pipe, and the connecting pipe between the indoor unit and the outdoor unit is a thin pipe.
4. The control device according to claim 3, wherein the number of the wide tube sensor (6), the narrow tube sensor (5) and the electronic expansion valve opening degree detection module is plural, and one wide tube sensor (6), the narrow tube sensor (5) and the electronic expansion valve opening degree detection module are provided for each indoor unit.
5. The control device of claim 3, wherein the control module comprises:
the first judgment module is used for judging whether the following conditions are met or not: t isB thick pipe-TB thin tube≥C1℃、PA≥C2、TExhaust of gases≥C3℃；
The second judgment module is used for judging whether the following conditions are met or not: t isB thick pipe-TB thin tube≤D1℃、PA≤D2、TExhaust of gases≤D3℃。
6. The control apparatus of claim 3, wherein the control strategy comprises instructions to:
a valve opening command: the opening of an electronic expansion valve of the standby indoor unit is increased at a certain rate;
valve closing command: the opening of an electronic expansion valve of the standby indoor unit is reduced at a certain rate;
maintain invariant instruction: the opening degree of the electronic expansion valve of the standby indoor unit is kept unchanged.
7. A multiple air conditioning system comprising a control device of an electronic expansion valve as claimed in any one of claims 3 to 6.
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| CN110986224B (en) * | 2019-11-07 | 2021-05-14 | 珠海格力电器股份有限公司 | Air conditioner, control method thereof and storage medium |
| CN113531856A (en) * | 2020-04-22 | 2021-10-22 | 青岛海尔空调电子有限公司 | Multi-connected air conditioning system and refrigerant flow control method thereof |
| CN112344537B (en) * | 2020-11-17 | 2021-09-07 | 珠海格力电器股份有限公司 | Noise reduction control method and device for indoor unit of multi-split air conditioner and multi-split air conditioner |
| CN114754467A (en) * | 2022-02-28 | 2022-07-15 | 青岛海尔空调电子有限公司 | Control method of multi-split system |
| CN114992816B (en) * | 2022-06-20 | 2023-09-08 | 宁波奥克斯电气股份有限公司 | Control method and device of multi-split air conditioner, air conditioner and readable storage medium |
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| CN104534760A (en) * | 2015-01-26 | 2015-04-22 | 珠海格力电器股份有限公司 | Electronic expansion valve control method and device and air-conditioning machine set |
| CN104697120A (en) * | 2015-03-24 | 2015-06-10 | 广东美的暖通设备有限公司 | VRV (Varied Refrigerant Volume) system and noise reduction control method thereof |
| CN108168169A (en) * | 2017-12-01 | 2018-06-15 | 青岛海尔空调电子有限公司 | The noise control method of multi-connected air conditioning system |
| CN108224739A (en) * | 2017-12-01 | 2018-06-29 | 青岛海尔空调电子有限公司 | The noise control method of multi-connected air conditioning system |
| CN108224689A (en) * | 2017-12-01 | 2018-06-29 | 青岛海尔空调电子有限公司 | The noise control method and controller of multi-connected air conditioning system |
| CN108413586A (en) * | 2018-01-22 | 2018-08-17 | 宁波奥克斯电气股份有限公司 | The method for noise reduction control and multi-connected machine of multi-connected machine |
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