CN101089494A - Control method for electronic expansion valve of air conditioner - Google Patents
Control method for electronic expansion valve of air conditioner Download PDFInfo
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- CN101089494A CN101089494A CN 200610086721 CN200610086721A CN101089494A CN 101089494 A CN101089494 A CN 101089494A CN 200610086721 CN200610086721 CN 200610086721 CN 200610086721 A CN200610086721 A CN 200610086721A CN 101089494 A CN101089494 A CN 101089494A
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Abstract
The present invention relates to an air conditioner electronic expansion valve control method. It is characterized by that it can utilize temperature variable quantity of compressor and condenser to regulate opening angle of electronic expansion valve. Besides, said invention also provides the concrete steps of said control method.
Description
Technical field
The present invention relates to a kind of control method of air conditioner electronic expansion valve, the control method for electronic expansion valve of air conditioner that especially a kind of temperature variation that utilizes compressor and freezing machine is regulated the opening angle of electric expansion valve.
Background technology
Usually, air-conditioning is meant and is used for the equipment that cooling-heating room is handled is carried out in certain space, functions such as dehumidifying, purification also are provided usually simultaneously.Aforesaid air-conditioning be in order can routinely to regulate the flow of refrigerant by the load variations of indoor set, need to use electric expansion valve (Linear expansionvalve, LEV).Promptly electric expansion valve is controlled, thereby the cooling-heating room power of indoor set is controlled according to the Current Temperatures in the space that indoor set is installed and the difference between the set target temperature.
Seeing also shown in Figure 1ly, is the flow chart that the control method for electronic expansion valve to existing air-conditioning describes.As shown in Figure 1, after the operation of compressor stops, with electric expansion valve (LEV) be opened into the 1st opening angle value (S10, S15); Then after the compressor starts operation, with the opening angle benchmark opening angle value of electric expansion valve when the 1st current opening angle value is opened into primary starting control 70% (S20, S25); If the running frequency of compressor reaches greater than the 1st running frequency but during less than the state of the 2nd running frequency when compressor continues operation, with electric expansion valve be opened into benchmark opening angle value 90% (S30, S35); And, electric expansion valve is opened into benchmark opening angle (S40) when the running frequency of compressor during greater than the 2nd running frequency.
In aforesaid primary starting control procedure, after surpassing 90 seconds, the certain opening angle of electric expansion valve maintenance will enter timing controlled state (S55).Under the timing controlled state, will utilize set target temperature and the gap between the Current Temperatures, the increase and decrease amplitude of the control impuls value that is used to control the electric expansion valve opening angle is controlled.When promptly the gap between target temperature and Current Temperatures is big, the control impuls value is increased to bigger amplitude; And when the gap between target temperature and the Current Temperatures hour, the control impuls value is reduced to less amplitude, and controls with this opening angle to electric expansion valve.
But when utilizing aforesaid mode that the electric expansion valve opening angle of air-conditioning is regulated, under the state that compressor operating restarted after a period of time, can not cause problem to take place because the temperature variation between compressor and the freezing machine is less; But under the initial state that starts of compressor, the temperature of compressor will sharply rise and the opening angle intensity of variation of the electric expansion valve when therefore causing entering the timing controlled state bigger, thereby might cause the variation of unwanted air conditioner load.
This shows that above-mentioned existing control method for electronic expansion valve of air conditioner obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of new control method for electronic expansion valve of air conditioner, just becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing control method for electronic expansion valve of air conditioner exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of new control method for electronic expansion valve of air conditioner, can improve general existing control method for electronic expansion valve of air conditioner, make it have more practicality.Through constantly research, design, and, create the present invention who has practical value finally through after studying sample and improvement repeatedly.
Summary of the invention
Main purpose of the present invention is, overcome the defective that existing control method for electronic expansion valve of air conditioner exists, and provide a kind of new control method for electronic expansion valve of air conditioner, technical problem to be solved is to make it that a kind of air conditioner electronic control valve control method is provided, by enabling the timing controlled mode under the state that diminishes at the temperature variation between compressor and the freezing machine opening angle of electric expansion valve is controlled, thereby reduce the variation of load to greatest extent, thereby be suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of control method for electronic expansion valve of air conditioner that the present invention proposes, its running frequency that is included in compressor arrives before the initial stage standard value, the stage of the opening angle of electric expansion valve being controlled according to the variation of compressor operating frequency; The stage that the temperature variation of compressor and freezing machine is detected respectively; All do not reach the 1st when temperature is set at the temperature variation of compressor and freezing machine, the stage of utilizing the timing controlled mode that the opening angle of electric expansion valve is controlled; And some in the temperature variation of the temperature variation of compressor and above-mentioned freezing machine surpass the 1st when temperature is set, and makes electric expansion valve keep the stage of original opening angle.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid control method for electronic expansion valve of air conditioner, the wherein above-mentioned the 1st is provided with temperature is about 1 ℃.
Aforesaid control method for electronic expansion valve of air conditioner, wherein also be included in above-mentioned electric expansion valve and keep the time of original opening angle to surpass the 1st being provided with after the time, the stage of utilizing above-mentioned timing controlled mode that the opening angle of above-mentioned electric expansion valve is controlled again is advisable.
Aforesaid control method for electronic expansion valve of air conditioner, the wherein above-mentioned the 1st is provided with the time is about 15 minutes.
Aforesaid control method for electronic expansion valve of air conditioner in the wherein above-mentioned stage of utilizing the timing controlled mode that the opening angle of above-mentioned electric expansion valve is controlled, comprises the stage that indoor Current Temperatures is detected; The stage that temperature difference between above-mentioned Current Temperatures and the set target temperature is calculated; According to the said temperature extent increase and decrease amplitude of the control impuls value that is used to control above-mentioned electric expansion valve opening angle is regulated, thus the stage that the opening degree of above-mentioned electric expansion valve is controlled.
Aforesaid control method for electronic expansion valve of air conditioner, the stage that the wherein above-mentioned variation that utilizes running frequency is controlled the opening angle of above-mentioned electric expansion valve, be included in and start after the above-mentioned compressor when the running frequency of above-mentioned compressor does not reach the 1st running frequency, then with stage of the 1st opening angle value of above-mentioned electronic expansion opening of valves; When the running frequency of above-mentioned compressor during, above-mentioned electric expansion valve is opened into stage greater than the 2nd opening angle value of the 1st opening angle value greater than the 1st running frequency but less than the 2nd running frequency; When the running frequency of above-mentioned compressor during, above-mentioned electric expansion valve is opened into stage greater than the 3rd opening angle of the 2nd opening angle value greater than the 2nd running frequency.
Via as can be known above-mentioned, the present invention relates to the control method for electronic expansion valve of air conditioner that a kind of temperature variation that utilizes compressor and freezing machine is regulated the opening angle of electric expansion valve.Be suitable for control method for electronic expansion valve of air conditioner of the present invention, at first before the running frequency of compressor arrives the initial stage standard value, the opening angle of electric expansion valve controlled according to the variation of compressor operating frequency; Then detect, make its temperature variation all not reach the 1st when temperature is set, utilize the timing controlled mode that the opening angle of electric expansion valve is controlled at compressor and freezing machine by temperature variation to compressor and freezing machine; Some in the temperature variation of compressor and freezing machine surpasses the 1st when temperature is set then, makes electric expansion valve keep original opening angle before through the 1st being set the time.Utilize the present invention, can prevent to carry out unwanted electric expansion valve opening angle and regulate operation, thereby stable control is carried out in the operation to air-conditioning when reducing load variations to greatest extent.
By technique scheme, control method for electronic expansion valve of air conditioner of the present invention has following advantage at least:
Enable the timing controlled mode under the state that the present invention can diminish at the temperature variation between compressor and the freezing machine, thereby prevent to carry out unwanted electric expansion valve opening angle and regulate operation, stable control is carried out in the operation to air-conditioning when reducing load variations to greatest extent.
In sum, the control method for electronic expansion valve of air conditioner of novelty of the present invention has above-mentioned plurality of advantages and practical value, obvious improvement is arranged technically, and produced handy and practical effect, and more existing control method for electronic expansion valve of air conditioner has the effect of enhancement, thereby being suitable for practicality more, and having the extensive value of industry, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the flow chart that the control method for electronic expansion valve that has air-conditioning now is described;
Fig. 2 carries out illustrated calcspar to using the air conditioner structure that is suitable for control method for electronic expansion valve of the present invention;
Fig. 3 a and Fig. 3 b are the flow charts that the control method for electronic expansion valve of air conditioner that is suitable for a certain embodiment of the present invention is described.
100: indoor set 110: the indoor temperature detecting sensor
115: indoor comb temperature sensor 150: indoor set microprocessor
200: off-premises station 210: the outdoor temperature detecting sensor
215: outdoor comb temperature sensor 220: driven compressor portion
225: compressor 230: temperature sensor spues
240: electric expansion valve 250: the off-premises station microprocessor
The specific embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to its specific embodiment of control method for electronic expansion valve of air conditioner, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
In order to achieve the above object, the invention is characterized in: a kind of control method for electronic expansion valve of air conditioner, the running frequency that is included in compressor arrives before the initial stage standard value, the stage of the opening angle of electric expansion valve being controlled according to the variation of compressor operating frequency; The stage that the temperature variation of compressor and freezing machine is detected respectively; All do not reach the 1st when temperature is set at the temperature variation of compressor and freezing machine, the stage of utilizing the timing controlled mode that the opening angle of electric expansion valve is controlled; Some in the temperature variation of the temperature variation of compressor and above-mentioned freezing machine surpasses the 1st when temperature is set, and makes electric expansion valve keep the stage of original opening angle.
Wherein, also be included in above-mentioned electric expansion valve and keep the time of original opening angle to surpass the 1st being provided with after the time, the stage of utilizing above-mentioned timing controlled mode that the opening angle of above-mentioned electric expansion valve is controlled again is advisable.
Below, the present invention will be described in detail in conjunction with the accompanying drawings.
Seeing also shown in Figure 2ly, is to carry out illustrated figure to using the air conditioner structure that is suitable for control method for electronic expansion valve of the present invention.Be suitable for air-conditioning of the present invention as shown in Figure 2, comprise indoor set 100 and off-premises station 200.Wherein, above-mentioned indoor set 100 comprises indoor temperature detecting sensor 110; Indoor comb temperature sensor 115; Indoor set microprocessor 150; Indoor set Department of Communication Force 155; Be used for the indoor heat exchanger (figure does not mark) of execution heat exchange between room air and refrigerant etc.
Indoor temperature detecting sensor 110 is used for the temperature of room air is detected, and indoor comb temperature sensor 115 is used for the temperature of indoor comb is detected.Indoor set microprocessor 150 utilizes 110 pairs of indoor temperature of indoor temperature detecting sensor to detect, and utilizes the temperature of 115 pairs of indoor combs of indoor comb temperature sensor to detect.Indoor set microprocessor 155 will utilize indoor set Department of Communication Force 155 and off-premises station Department of Communication Force 255 to communicate with off-premises station microprocessor 250.
Off-premises station 200 comprises outdoor temperature detecting sensor 210; Outdoor comb temperature sensor 215; Driven compressor portion 220; Compressor 225; Temperature sensor 230 spues; Electric expansion valve 240; Off-premises station microprocessor 250; Off-premises station Department of Communication Force 255.In this external off-premises station 200, also comprise the outdoor heat exchanger (figure does not mark) that is used between outdoor air and refrigerant, carrying out heat exchange; The outdoor draft fan (not marking among the figure) that outdoor air after the heat exchange is blown.
Outdoor temperature detecting sensor 210 is used for the temperature of outdoor air is detected, and outdoor comb temperature sensor 215 is used for the temperature of outdoor comb is detected.Compressor 225 is used for refrigerant is compressed, and driven compressor portion 220 is used for the driving of compressor 206 is controlled.The temperature sensor 230 that spues is used for the temperature that spues of compressor is detected.Off-premises station microprocessor 250, to utilize 210 pairs of outdoor temperature of outdoor temperature detecting sensor to detect, and utilize the temperature of 215 pairs of outdoor combs of outdoor comb temperature sensor to detect, utilize the temperature that spues of the 230 pairs of compressors of temperature sensor that spue to detect simultaneously.
The heat that freezing machine is used for refrigerant is comprised is dissipated in the air constantly, thereby it is cooled off and liquefies.With the greenhouse mode operation time, indoor heat exchanger is used as freezing machine, and with the cold-room mode operation time, outdoor heat exchanger is used as freezing machine.Freezing machine is the temperature of outdoor heat exchanger and indoor heat exchanger, can utilize indoor comb temperature sensor 115 and outdoor comb temperature sensor 215 to detect respectively.
In addition, off-premises station microprocessor 250 will be according to detected indoor temperature, indoor and outdoor comb temperature and the temperature etc. that spues, and the opening angle of the electric expansion valve 240 that can regulate cold medium flux is continuously controlled.
Seeing also shown in Fig. 3 a and Fig. 3 b, is the flow chart that the control method for electronic expansion valve of air conditioner that is suitable for a certain embodiment of the present invention is described.Below, will be described in detail the control method for electronic expansion valve of air conditioner that is suitable for a certain embodiment of the present invention in conjunction with Fig. 2 to Fig. 3 b.
At first after the operation of compressor 225 stops, the control by off-premises station microprocessor 250 with electric expansion valve (LEV) 240 be opened into the 1st opening angle value (S310, S315); Then bring into operation and the running frequency of compressor 225 during less than the 1st running frequency at compressor 225, with electric expansion valve 240 from the 1st current opening angle value be opened into primary starting when control opening angle benchmark opening angle value 70% (S320, S325); If the running frequency of compressor 225 reaches greater than the 1st running frequency but during less than the state of the 2nd running frequency, electric expansion valve 240 is opened into 90% (S335) of benchmark opening angle value when compressor continues operation.
The running frequency that continues operation and compressor 225 when compressor is during greater than the 2nd running frequency, the benchmark opening angle value (S340) when electric expansion valve 240 is opened into primary starting control.Aforesaid initial stage control method is identical with existing control method.
After carrying out primary starting control, the temperature variation of compressor and the temperature variation of freezing machine are detected.The temperature variation of compressor 225 can utilize by the temperature that spues of the temperature sensor 230 detected compressors 225 that spue and calculate, and the temperature variation of freezing machine can utilize by the comb temperature of outdoor comb temperature sensor 215 detected outdoor heat exchanger and calculates.The result who detects according to aforesaid mode, when the temperature variation of compressor greater than the temperature variation of 1 ℃ of per minute or freezing machine during greater than 1 ℃ of per minute, do not enter the timing controlled state and benchmark opening angle value when keeping primary starting control.
In contrast, when the temperature variation of the temperature variation of compressor and freezing machine during less than 1 ℃ of per minute, enter the timing controlled state (S350, S355).Even the temperature variation of compressor or freezing machine is greater than 1 ℃ of per minute, finish primary starting control and through 15 minutes after also will enter timing controlled state (S345).
Carrying out under the time-controlled state shown in Fig. 3 b, off-premises station microprocessor 250 will be regulated the opening angle of electric expansion valve 240 according to set target temperature and the temperature difference of utilizing indoor temperature detecting sensor 110 detected current indoor temperatures.That is, when | target temperature-Current Temperatures | in the time of 〉=10 ℃, after the opening angle that keeps electric expansion valve 240 was through 2 minutes, with 12 be unit to the control impuls value of the opening angle that is used to control electric expansion valve 240 regulate (S410, S415); And work as | target temperature-Current Temperatures | in the time of 〉=5 ℃, be held open angle through 90 seconds after, with 5 be unit to the control impuls value regulate (S425, S430); And work as | target temperature-Current Temperatures | in the time of 〉=1 ℃, be held open angle through 30 seconds after, with 2 be unit to the control impuls value regulate (S445, S450); And work as | target temperature-Current Temperatures | in the time of＜1 ℃, keep the opening angle of electric expansion valve 240.That is,, the increase and decrease amplitude of the control impuls value that is used to control electric expansion valve 240 opening angles is controlled according to the temperature extent between target temperature and the Current Temperatures.That is, when differing greatly between target temperature and the Current Temperatures, make the opening angle of electric expansion valve 240 take place to change fast; And when the difference between target temperature and the Current Temperatures hour, make the opening angle of electric expansion valve 240 take place to change slowly.
By aforesaid process, enable the timing controlled mode under the state that can diminish at the temperature variation between compressor and the freezing machine, thereby target temperature when reducing timing controlled and the temperature difference between the Current Temperatures, and reduce the increase and decrease amplitude of control impuls value with this.Therefore, can prevent to carry out unwanted electric expansion valve opening angle and regulate operation, thereby stable control is carried out in the operation to air-conditioning when reducing load variations to greatest extent.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong to the scope of technical solution of the present invention.
Claims (6)
1, a kind of control method for electronic expansion valve of air conditioner is characterized in that:
The running frequency that is included in compressor arrives before the initial stage standard value, the stage of the opening angle of electric expansion valve being controlled according to the variation of compressor operating frequency;
The stage that the temperature variation of compressor and freezing machine is detected respectively;
All do not reach the 1st when temperature is set at the temperature variation of compressor and freezing machine, the stage of utilizing the timing controlled mode that the opening angle of electric expansion valve is controlled; And
Some in the temperature variation of the temperature variation of compressor and above-mentioned freezing machine surpasses the 1st when temperature is set, and makes electric expansion valve keep the stage of original opening angle.
2, a kind of control method for electronic expansion valve of air conditioner according to claim 1 is characterized in that: the above-mentioned the 1st is provided with temperature is about 1 ℃.
3, a kind of control method for electronic expansion valve of air conditioner according to claim 1, it is characterized in that it also is included in above-mentioned electric expansion valve and keeps the time of original opening angle to surpass the 1st being provided with after the time, the stage of utilizing above-mentioned timing controlled mode that the opening angle of above-mentioned electric expansion valve is controlled again is advisable.
4, a kind of control method for electronic expansion valve of air conditioner according to claim 3 is characterized in that: the above-mentioned the 1st is provided with the time is about 15 minutes.
5, a kind of control method for electronic expansion valve of air conditioner according to claim 1 is characterized in that: in the above-mentioned stage of utilizing the timing controlled mode that the opening angle of above-mentioned electric expansion valve is controlled, comprise the stage that indoor Current Temperatures is detected; The stage that temperature difference between above-mentioned Current Temperatures and the set target temperature is calculated; According to the said temperature extent increase and decrease amplitude of the control impuls value that is used to control above-mentioned electric expansion valve opening angle is regulated, thus the stage that the opening degree of above-mentioned electric expansion valve is controlled.
6, a kind of control method for electronic expansion valve of air conditioner according to claim 1, it is characterized in that: the stage that the above-mentioned variation that utilizes running frequency is controlled the opening angle of above-mentioned electric expansion valve, be included in and start after the above-mentioned compressor when the running frequency of above-mentioned compressor does not reach the 1st running frequency, then with stage of the 1st opening angle value of above-mentioned electronic expansion opening of valves; When the running frequency of above-mentioned compressor during, above-mentioned electric expansion valve is opened into stage greater than the 2nd opening angle value of the 1st opening angle value greater than the 1st running frequency but less than the 2nd running frequency; When the running frequency of above-mentioned compressor during, above-mentioned electric expansion valve is opened into stage greater than the 3rd opening angle of the 2nd opening angle value greater than the 2nd running frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100867214A CN101089494B (en) | 2006-06-16 | 2006-06-16 | Control method for electronic expansion valve of air conditioner |
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| CN2006100867214A CN101089494B (en) | 2006-06-16 | 2006-06-16 | Control method for electronic expansion valve of air conditioner |
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| CN101089494A true CN101089494A (en) | 2007-12-19 |
| CN101089494B CN101089494B (en) | 2011-07-06 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134135A (en) * | 2011-11-25 | 2013-06-05 | 比亚迪股份有限公司 | Control method and control system for household air conditioner electronic expansion valve |
| CN103512145A (en) * | 2012-06-19 | 2014-01-15 | 珠海格力电器股份有限公司 | Adjusting method and adjusting device of electronic expansion valve for air conditioning unit |
| WO2015043519A1 (en) * | 2013-09-28 | 2015-04-02 | 杭州三花研究院有限公司 | Refrigerant circulation system |
| CN105588273A (en) * | 2015-09-30 | 2016-05-18 | 青岛海信日立空调系统有限公司 | Control method for opening degree of electronic expansion valves, indoor unit, outdoor unit and air-conditioner |
| CN111425996A (en) * | 2020-02-26 | 2020-07-17 | 青岛海尔空调电子有限公司 | Control method of air conditioner |
| CN113959080A (en) * | 2021-09-30 | 2022-01-21 | 青岛海尔空调电子有限公司 | Control method for electronic expansion valve of air conditioning unit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003156244A (en) * | 2001-11-20 | 2003-05-30 | Fujitsu General Ltd | Control method for air-conditioner |
| KR100457569B1 (en) * | 2002-11-22 | 2004-11-18 | 엘지전자 주식회사 | a linear expansion valve's control method for a heat pump system |
| JP2004218879A (en) * | 2003-01-10 | 2004-08-05 | Matsushita Electric Ind Co Ltd | Air conditioner and its control method |
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- 2006-06-16 CN CN2006100867214A patent/CN101089494B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103134135A (en) * | 2011-11-25 | 2013-06-05 | 比亚迪股份有限公司 | Control method and control system for household air conditioner electronic expansion valve |
| CN103134135B (en) * | 2011-11-25 | 2015-08-26 | 比亚迪股份有限公司 | A kind of control method of household air conditioner electronic expansion valve and control system |
| CN103512145A (en) * | 2012-06-19 | 2014-01-15 | 珠海格力电器股份有限公司 | Adjusting method and adjusting device of electronic expansion valve for air conditioning unit |
| CN103512145B (en) * | 2012-06-19 | 2016-08-31 | 珠海格力电器股份有限公司 | The control method of a kind of air conditioning unit electric expansion valve and adjusting means |
| WO2015043519A1 (en) * | 2013-09-28 | 2015-04-02 | 杭州三花研究院有限公司 | Refrigerant circulation system |
| US10286752B2 (en) | 2013-09-28 | 2019-05-14 | Hangzhou Sanhua Research Institute Co., Ltd. | Refrigerant circulation system |
| CN105588273A (en) * | 2015-09-30 | 2016-05-18 | 青岛海信日立空调系统有限公司 | Control method for opening degree of electronic expansion valves, indoor unit, outdoor unit and air-conditioner |
| CN105588273B (en) * | 2015-09-30 | 2018-10-09 | 青岛海信日立空调系统有限公司 | A kind of aperture control method, indoor unit, outdoor unit and the air-conditioning of electric expansion valve |
| CN111425996A (en) * | 2020-02-26 | 2020-07-17 | 青岛海尔空调电子有限公司 | Control method of air conditioner |
| CN113959080A (en) * | 2021-09-30 | 2022-01-21 | 青岛海尔空调电子有限公司 | Control method for electronic expansion valve of air conditioning unit |
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