CN102734994B - Method and system for controlling frequency conversion refrigerant temperature of refrigeration system - Google Patents
Method and system for controlling frequency conversion refrigerant temperature of refrigeration system Download PDFInfo
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Abstract
The invention discloses a method and a system for controlling frequency conversion refrigerant temperature of a refrigeration system. The method comprises the following steps that: a first temperature sensor samples the temperature of a refrigeration space; a temperature control module is used for comparing a temperature value of the refrigeration space and a preset object temperature value to obtain a first temperature difference value, and performing PID (Proportion Integration Differentiation) regulation on the first temperature difference value to obtain an object temperature value of an evaporator coil pipe; a second temperature sensor samples the temperature of the evaporator coil pipe; the temperature control module is used for comparing a temperature value of the evaporator coil pipe and the object temperature value of the evaporator coil pipe to obtain a second temperature difference value, performing the PID regulation on the second temperature difference value to obtain an object working frequency of a compressor, and outputting the object working frequency to a frequency conversion inversion unit; and the frequency conversion inversion unit drives the compressor to work according to the object working frequency of the compressor and controls the temperature value of the refrigeration space to be higher than the preset temperature value. According to the scheme disclosed by the invention, rapid and precise regulation on the frequency conversion refrigerant temperature of the refrigeration system is achieved.
Description
Technical field
The present invention relates to refrigeration technology field, relate in particular to a kind of control method and system of refrigeration system frequency conversion cryogenic temperature.
Background technology
The control method of refrigeration system frequency conversion cryogenic temperature of the prior art, normally adopt the monocycle segmentation scales from temperature difference (difference of the target temperature value of the actual temperature value of refrigeration space and the refrigeration space setting in advance) to compressor frequency to regulate method, yet, there is following defect in the method: the characteristic of cooling system link is relied on by force, cause a large amount of empirical data of the method needs to realize the temperature of refrigeration system is regulated; And the method can not realize quick adjustment and the fine adjustment to refrigeration system frequency conversion cryogenic temperature.
Summary of the invention
Main purpose of the present invention is to provide a kind of control method of refrigeration system frequency conversion cryogenic temperature, is intended to realize quick adjustment and the fine adjustment to refrigeration system frequency conversion cryogenic temperature.
In order to achieve the above object, the present invention proposes a kind of control method of refrigeration system frequency conversion cryogenic temperature, and the method comprises the following steps:
Step S01: the first temperature sensor is sampled to the actual temperature of refrigeration space, and the temperature value being sampled exports temperature control modules to;
Step S02: described temperature control modules compares the actual temperature value of described refrigeration space and the target temperature value of the refrigeration space setting in advance, obtain the first temperature gap, and described the first temperature gap is carried out to PID adjusting, obtain the target temperature value of evaporator coil;
Step S03: the second temperature sensor is sampled to the actual temperature of evaporator coil, and the temperature value being sampled exports described temperature control modules to;
Step S04: described temperature control modules compares the target temperature value of the actual temperature value of described evaporator coil and described evaporator coil, obtain the second temperature gap, and described the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and exported to frequency conversion inversion unit;
Step S05: described frequency conversion inversion unit is according to the target operating frequency of described compressor, and the work of drive compression machine, is controlled at the temperature of described refrigeration space in preset temperature value.
Preferably, before described step S01, also comprise step S00:
Temperature setting unit arranges the target temperature value of refrigeration space, and exports described target temperature value to described temperature control modules.
Preferably, after described step S02, also comprise:
Described temperature control modules carries out amplitude limiting processing to the target temperature value of described evaporator coil.
Preferably, described step S04 is specially:
Described temperature control modules compares the target temperature value of the described evaporator coil after the actual temperature value of described evaporator coil and amplitude limiting processing, obtain the second temperature gap, and described the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and the target operating frequency of described compressor is carried out to amplitude limiting processing, and export the target operating frequency of the described compressor after amplitude limiting processing to frequency conversion inversion unit.
Preferably, described temperature setting unit, by the communication mode of parallel or serial, exports the target temperature value of the refrigeration space of setting to described temperature control modules; Described temperature control modules, by the communication mode of parallel or serial, exports the target operating frequency of the described compressor after amplitude limiting processing to described frequency conversion inversion unit.
Preferably, the sample frequency to described the first temperature gap that described temperature control modules carries out adopting when PID regulates to described the first temperature gap be less than described evaporator coil rate of temperature change 1/10.
The present invention also proposes a kind of temperature control system of refrigeration system frequency conversion refrigeration, and this system comprises temperature setting unit, the first temperature sensor, the second temperature sensor, temperature control modules, frequency conversion inversion unit and compressor, wherein:
Described temperature setting unit is used for setting in advance the target temperature value of refrigeration space, and exports described target temperature value to described temperature control modules.
Described the first temperature sensor is for the actual temperature of refrigeration space is sampled, and the temperature value being sampled exports temperature control modules to;
Described the second temperature sensor is for the actual temperature of evaporator coil is sampled, and the temperature value being sampled exports described temperature control modules to;
Described temperature control modules is for comparing the actual temperature value of described refrigeration space and the target temperature value of the refrigeration space setting in advance, obtain the first temperature gap, and described the first temperature gap is carried out to PID adjusting, obtain the target temperature value of evaporator coil; And the target temperature value of the actual temperature value of described evaporator coil and described evaporator coil is compared, obtain the second temperature gap, and described the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and exported to frequency conversion inversion unit;
Described frequency conversion inversion unit is used for according to the target operating frequency of described compressor, and the work of drive compression machine, is controlled at the temperature of described refrigeration space in preset temperature value.
Preferably, described temperature control modules is also for the target temperature value of described evaporator coil is carried out to amplitude limiting processing, and the target operating frequency of described compressor is carried out to amplitude limiting processing.
Preferably, the sample frequency to described the first temperature gap that described temperature control modules carries out adopting when PID regulates to described the first temperature gap be less than described evaporator coil rate of temperature change 1/10.
Preferably, described temperature setting unit, by the communication mode of parallel or serial, exports the target temperature value of the refrigeration space of setting to described temperature control modules; Described temperature control modules, by the communication mode of parallel or serial, exports the target operating frequency of the described compressor after amplitude limiting processing to described frequency conversion inversion unit.
The control method of the refrigeration system frequency conversion cryogenic temperature that the present invention proposes, by the first temperature sensor, the actual temperature of refrigeration space is sampled, and the temperature value being sampled exports temperature control modules to, temperature control modules compares the actual temperature value of refrigeration space and the target temperature value of the refrigeration space setting in advance, obtain the first temperature gap, and the first temperature gap is carried out to PID adjusting, obtain the target temperature value of evaporator coil.Simultaneously, by the second temperature sensor, the actual temperature of evaporator coil is sampled, and the temperature value being sampled exports temperature control modules to, temperature control modules compares the target temperature value of the actual temperature value of evaporator coil and evaporator coil, obtain the second temperature gap, and the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and exported to frequency conversion inversion unit.Frequency conversion inversion unit is according to the target operating frequency of compressor, and the work of drive compression machine, is controlled at the temperature of refrigeration space in preset temperature value.The present invention is owing to having adopted the PID control method of two closed loops to regulate the temperature of refrigeration system, thereby realized quick adjustment and the fine adjustment to refrigeration system frequency conversion cryogenic temperature.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of control method first embodiment of refrigeration system frequency conversion cryogenic temperature of the present invention;
Fig. 2 is the schematic flow sheet of control method second embodiment of refrigeration system frequency conversion cryogenic temperature of the present invention;
Fig. 3 is the structural representation of temperature control modules in control method second embodiment of refrigeration system frequency conversion cryogenic temperature of the present invention;
Fig. 4 is the control principle block diagram of control method second embodiment of refrigeration system frequency conversion cryogenic temperature of the present invention;
Fig. 5 is the structured flowchart of temperature control system one embodiment of refrigeration system frequency conversion refrigeration of the present invention.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
The specific embodiment
Below in conjunction with Figure of description and specific embodiment, further illustrate technical scheme of the present invention.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 is the schematic flow sheet of control method first embodiment of refrigeration system frequency conversion cryogenic temperature of the present invention.
With reference to Fig. 1, the control method of refrigeration system frequency conversion cryogenic temperature of the present invention comprises the following steps:
Step S01: the first temperature sensor is sampled to the actual temperature of refrigeration space, and the temperature value being sampled exports temperature control modules to;
Step S02: described temperature control modules compares the actual temperature value of described refrigeration space and the target temperature value of the refrigeration space setting in advance, obtain the first temperature gap, and described the first temperature gap is carried out to PID adjusting, obtain the target temperature value of evaporator coil;
Particularly, the target temperature value of the actual temperature value of the refrigeration space that temperature control modules samples the first temperature sensor and the refrigeration space setting in advance compares, obtain the first temperature gap, and the first temperature gap is carried out to PID adjusting, obtain the target temperature value of evaporator coil, and the target temperature value of evaporator coil is carried out to amplitude limiting processing.
Step S03: the second temperature sensor is sampled to the actual temperature of evaporator coil, and the temperature value being sampled exports described temperature control modules to;
Step S04: described temperature control modules compares the target temperature value of the actual temperature value of described evaporator coil and described evaporator coil, obtain the second temperature gap, and described the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and exported to frequency conversion inversion unit;
Particularly, the actual temperature value of the evaporator coil that temperature control modules samples the second temperature sensor and the target temperature value of the evaporator coil after amplitude limiting processing compare, obtain the second temperature gap, and the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and the target operating frequency of compressor is carried out to amplitude limiting processing, and export the target operating frequency of the compressor after amplitude limiting processing to frequency conversion inversion unit.
Step S05: described frequency conversion inversion unit is according to the target operating frequency of described compressor, and the work of drive compression machine, is controlled at the temperature of described refrigeration space in preset temperature value.
In the embodiment of the present invention, the sample frequency to the first temperature gap that temperature control modules carries out adopting when PID regulates to the first temperature gap be less than evaporator coil rate of temperature change 1/10.Temperature control modules, by the communication mode of parallel or serial, exports the target operating frequency of the compressor after amplitude limiting processing to frequency conversion inversion unit.
With reference to Fig. 2, the control method of refrigeration system frequency conversion cryogenic temperature of the present invention, before step S01, also comprises:
Step S00: temperature setting unit arranges the target temperature value of refrigeration space, and export described target temperature value to described temperature control modules.
The embodiment of the present invention can by temperature setting unit, (this temperature setting unit be user's man-machine interface, can be that the temperature that the temperature of air-conditioning internal machine arranges panel, refrigerator-freezer or refrigerator arranges panel etc.) set in advance the target temperature value of refrigeration space, set target temperature value can export temperature control modules to by the communication mode of parallel or serial.And then operate according to the steps flow chart shown in Fig. 1.
The control method of the refrigeration system frequency conversion cryogenic temperature that the present invention proposes, by the first temperature sensor, the actual temperature of refrigeration space is sampled, and the temperature value being sampled exports temperature control modules to, temperature control modules compares the actual temperature value of refrigeration space and the target temperature value of the refrigeration space setting in advance, obtain the first temperature gap, and the first temperature gap is carried out to PID adjusting, obtain the target temperature value of evaporator coil.Simultaneously, by the second temperature sensor, the actual temperature of evaporator coil is sampled, and the temperature value being sampled exports temperature control modules to, temperature control modules compares the target temperature value of the actual temperature value of evaporator coil and evaporator coil, obtain the second temperature gap, and the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and exported to frequency conversion inversion unit.Frequency conversion inversion unit, according to the target operating frequency drive compression machine work of compressor, is controlled at the temperature of refrigeration space in preset temperature value.The present invention is owing to having adopted the PID control method of two closed loops to regulate the temperature of refrigeration system, thereby realized quick adjustment and the fine adjustment to refrigeration system frequency conversion cryogenic temperature.
Fig. 3 is the structural representation of temperature control modules in control method second embodiment of refrigeration system frequency conversion cryogenic temperature of the present invention.
With reference to Fig. 3, the temperature control modules in the embodiment of the present invention (shown by reference numeral is 100) comprises the first difference detecting unit 101, a PID regulon 102, the first amplitude limit unit 103, the second difference detecting unit 104, the 2nd PID regulon 105 and the second amplitude limit unit 106.
The control method of refrigeration system frequency conversion cryogenic temperature of the present invention is sampled to the actual temperature of refrigeration space by the first temperature sensor, and the actual temperature value of the refrigeration space that the first temperature sensor samples exports the first difference detecting unit 101 in temperature control modules to; By the second temperature sensor, the actual temperature of evaporator coil is sampled, the actual temperature value of the evaporator coil that the second temperature sensor samples exports the second difference detecting unit 104 in temperature control modules to.
Above-mentioned the first difference detecting unit 101, target temperature value for the actual temperature value of refrigeration space that the first temperature sensor is sampled and the refrigeration space that sets in advance compares, obtain the first temperature gap, and export this first temperature gap to a PID regulon 102;
The one PID regulon 102, for the first temperature gap is carried out to PID adjusting, obtains the target temperature value of evaporator coil, and is exported to the first amplitude limit unit 103;
The first amplitude limit unit 103, for the target temperature value of above-mentioned evaporator coil is carried out to amplitude limiting processing, and exports the target temperature value of the evaporator coil after amplitude limiting processing to second difference detecting unit 104;
The second difference detecting unit 104, for the actual temperature value of evaporator coil and the target temperature value of the evaporator coil after amplitude limiting processing that the second temperature sensor is sampled, compare, obtain the second temperature gap, and exported to the 2nd PID regulon 105;
The 2nd PID regulon 105, for the second temperature gap is carried out to PID adjusting, obtains the target operating frequency of compressor, and is exported to the second amplitude limit unit 106;
The second amplitude limit unit 106, for the target operating frequency of compressor is carried out to amplitude limiting processing, and exports the target operating frequency of the compressor after amplitude limiting processing to frequency conversion inversion unit.
Fig. 4 is the control principle block diagram of control method second embodiment of refrigeration system frequency conversion cryogenic temperature of the present invention.With reference to Fig. 3 and Fig. 4, the course of work of the control method of refrigeration system frequency conversion cryogenic temperature of the present invention is as follows in the lump:
First by temperature setting unit 200(user's man-machine interface, can be that the temperature that the temperature of air-conditioning internal machine arranges panel, refrigerator-freezer or refrigerator arranges panel etc.) set in advance the target temperature value of refrigeration space; By the actual temperature of 300 pairs of refrigeration spaces of the first temperature sensor, sample, and the actual temperature of the refrigeration space that it is sampled exports the first difference detecting unit 101 in temperature control modules 100 to simultaneously; The target temperature value of the actual temperature value of the refrigeration space that 101 pairs of the first temperature sensors 300 of the first difference detecting unit in temperature control modules 100 sample and the refrigeration space setting in advance compares, and obtains the first temperature gap; 102 pairs of the first temperature gaps of a PID regulon in temperature control modules 100 carry out PID adjusting, obtain the target temperature value of evaporator coil; The first amplitude limit unit 103 in temperature control modules 100 carries out amplitude limiting processing by the target temperature value of above-mentioned evaporator coil; The actual temperature value of evaporator coil and the target temperature value of the evaporator coil after amplitude limiting processing that 104 pairs of the second temperature sensors 400 of the second difference detecting unit in temperature control modules 100 sample compare, and obtain the second temperature gap; 105 pairs of the second temperature gaps of the 2nd PID regulon in temperature control modules 100 carry out PID adjusting, obtain the target operating frequency of compressor; The target operating frequency of the second 106 pairs of compressors in amplitude limit unit in temperature control modules 100 is carried out amplitude limiting processing, and exports the target operating frequency of the compressor after amplitude limiting processing to frequency conversion inversion unit 500; Frequency conversion inversion unit 500 is according to the target operating frequency of this compressor, and 600 work of drive compression machine, are controlled at the temperature of refrigeration space in preset temperature value.
The present invention also proposes a kind of frequency conversion cryogenic temperature control system, and Fig. 5 is the structured flowchart of temperature control system one embodiment of refrigeration system frequency conversion refrigeration of the present invention.
With reference to Fig. 5, the temperature control system of refrigeration system frequency conversion refrigeration of the present invention comprises temperature control modules 100, temperature setting unit 200, the first temperature sensor 300, the second temperature sensor 400, frequency conversion inversion unit 500 and compressor 600.
Wherein, temperature setting unit 200, for setting in advance the target temperature value of refrigeration space, and exports the target temperature value of setting to temperature control modules 100;
The first temperature sensor 300, samples for the actual temperature to refrigeration space, and the temperature value being sampled exports temperature control modules 100 to;
The second temperature sensor 400, samples for the actual temperature to evaporator coil, and the temperature value being sampled exports described temperature control modules 100 to;
Frequency conversion inversion unit 500, for the target operating frequency of the compressor exported according to temperature control modules 100, the work of drive compression machine 600, to be controlled at the temperature of refrigeration space in preset temperature value.
Wherein, the sample frequency to the first temperature gap that 100 pairs of the first temperature gaps of said temperature control module carry out adopting when PID regulates is less than 1/10 of evaporator coil temperature rate of change.Temperature setting unit 200, by the communication mode of parallel or serial, exports the target temperature value of the refrigeration space of setting to temperature control modules 100.Temperature control modules 100, by the communication mode of parallel or serial, exports the target operating frequency of the compressor after amplitude limiting processing to frequency conversion inversion unit 500.
The temperature control system of refrigeration system frequency conversion refrigeration of the present invention, by the first temperature sensor, the actual temperature of refrigeration space is sampled, and the temperature value being sampled exports temperature control modules to, temperature control modules compares the actual temperature value of refrigeration space and the target temperature value of the refrigeration space setting in advance, obtain the first temperature gap, and the first temperature gap is carried out to PID adjusting, obtain the target temperature value of evaporator coil.Simultaneously, by the second temperature sensor, the actual temperature of evaporator coil is sampled, and the temperature value being sampled exports temperature control modules to, temperature control modules compares the target temperature value of the actual temperature value of evaporator coil and evaporator coil, obtain the second temperature gap, and the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and exported to frequency conversion inversion unit.Frequency conversion inversion unit, according to the target operating frequency drive compression machine work of compressor, is controlled at the temperature of refrigeration space in preset temperature value.The present invention is owing to having adopted the PID control method of two closed loops to regulate the temperature of refrigeration system, thereby realized quick adjustment and the fine adjustment to refrigeration system frequency conversion cryogenic temperature.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a control method for refrigeration system frequency conversion cryogenic temperature, is characterized in that, comprises the following steps:
Step S01: the first temperature sensor is sampled to the actual temperature of refrigeration space, and the temperature value being sampled exports temperature control modules to;
Step S02: described temperature control modules compares the actual temperature value of described refrigeration space and the target temperature value of the refrigeration space setting in advance, obtain the first temperature gap, and described the first temperature gap is carried out to PID adjusting, obtain the target temperature value of evaporator coil;
Step S03: the second temperature sensor is sampled to the actual temperature of evaporator coil, and the temperature value being sampled exports described temperature control modules to;
Step S04: described temperature control modules compares the target temperature value of the actual temperature value of described evaporator coil and described evaporator coil, obtain the second temperature gap, and described the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and exported to frequency conversion inversion unit;
Step S05: described frequency conversion inversion unit is according to the target operating frequency of described compressor, and the work of drive compression machine, is controlled at the temperature of described refrigeration space in preset temperature value.
2. method according to claim 1, is characterized in that, also comprises step S00 before described step S01:
Temperature setting unit arranges the target temperature value of refrigeration space, and exports described target temperature value to described temperature control modules.
3. method according to claim 1, is characterized in that, after described step S02, also comprises:
Described temperature control modules carries out amplitude limiting processing to the target temperature value of described evaporator coil.
4. method according to claim 3, is characterized in that, described step S04 is specially:
Described temperature control modules compares the target temperature value of the described evaporator coil after the actual temperature value of described evaporator coil and amplitude limiting processing, obtain the second temperature gap, and described the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and the target operating frequency of described compressor is carried out to amplitude limiting processing, and export the target operating frequency of the described compressor after amplitude limiting processing to frequency conversion inversion unit.
5. method according to claim 4, is characterized in that, described temperature setting unit, by the communication mode of parallel or serial, exports the target temperature value of the refrigeration space of setting to described temperature control modules; Described temperature control modules, by the communication mode of parallel or serial, exports the target operating frequency of the described compressor after amplitude limiting processing to described frequency conversion inversion unit.
6. method according to claim 3, is characterized in that, the sample frequency to described the first temperature gap that described temperature control modules carries out adopting when PID regulates to described the first temperature gap be less than described evaporator coil rate of temperature change 1/10.
7. a temperature control system for refrigeration system frequency conversion refrigeration, is characterized in that, comprises temperature setting unit, the first temperature sensor, the second temperature sensor, temperature control modules, frequency conversion inversion unit and compressor, wherein:
Described temperature setting unit is used for setting in advance the target temperature value of refrigeration space, and exports described target temperature value to described temperature control modules;
Described the first temperature sensor is for the actual temperature of refrigeration space is sampled, and the temperature value being sampled exports temperature control modules to;
Described the second temperature sensor is for the actual temperature of evaporator coil is sampled, and the temperature value being sampled exports described temperature control modules to;
Described temperature control modules is for comparing the actual temperature value of described refrigeration space and the target temperature value of the refrigeration space setting in advance, obtain the first temperature gap, and described the first temperature gap is carried out to PID adjusting, obtain the target temperature value of evaporator coil; And the target temperature value of the actual temperature value of described evaporator coil and described evaporator coil is compared, obtain the second temperature gap, and described the second temperature gap is carried out to PID adjusting, obtain the target operating frequency of compressor, and exported to frequency conversion inversion unit;
Described frequency conversion inversion unit is used for according to the target operating frequency of described compressor, and the work of drive compression machine, is controlled at the temperature of described refrigeration space in preset temperature value.
8. system according to claim 7, is characterized in that, described temperature control modules is also for the target temperature value of described evaporator coil is carried out to amplitude limiting processing, and the target operating frequency of described compressor is carried out to amplitude limiting processing.
9. system according to claim 7, is characterized in that, the sample frequency to described the first temperature gap that described temperature control modules carries out adopting when PID regulates to described the first temperature gap be less than described evaporator coil rate of temperature change 1/10.
10. system according to claim 7, is characterized in that, described temperature setting unit, by the communication mode of parallel or serial, exports the target temperature value of the refrigeration space of setting to described temperature control modules; Described temperature control modules, by the communication mode of parallel or serial, exports the target operating frequency of the described compressor after amplitude limiting processing to described frequency conversion inversion unit.
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CN105241144B (en) * | 2015-11-12 | 2017-12-26 | 珠海格力电器股份有限公司 | A kind of closing method of low temperature unit, system, low temperature unit and refrigeration system |
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CN105485853B (en) * | 2015-12-29 | 2018-11-09 | 珠海格力电器股份有限公司 | The setting method and device of compressor of air conditioner running frequency |
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CN109017218A (en) * | 2018-07-23 | 2018-12-18 | 重庆超力高科技股份有限公司 | A kind of method for controlling number of revolution of compressor of air conditioner, device and electronic equipment |
CN109489186A (en) * | 2018-10-24 | 2019-03-19 | 武汉海尔电器股份有限公司 | The method, apparatus and computer storage medium of airconditioning control |
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