CN1517626A - Air conditioner and its control method - Google Patents
Air conditioner and its control method Download PDFInfo
- Publication number
- CN1517626A CN1517626A CNA2004100003294A CN200410000329A CN1517626A CN 1517626 A CN1517626 A CN 1517626A CN A2004100003294 A CNA2004100003294 A CN A2004100003294A CN 200410000329 A CN200410000329 A CN 200410000329A CN 1517626 A CN1517626 A CN 1517626A
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- Prior art keywords
- expansion valve
- open degree
- indoor
- mentioned
- valve open
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Air Conditioning Control Device (AREA)
Abstract
To determine the proper throttle amount without performing the feedback control, and to stabilize a refrigerating cycle in controlling an electronic expansion valve of an air conditioner. The optimum throttle valve opening to maximize the evaporator heat exchanging efficiency is calculated in a calculation block 71 on the basis of a calculating formula determined in advance by the experiment on the basis of an indoor temperature, an outdoor temperature, an indoor fan speed and a rotating frequency of a compressor 1, to control the electronic expansion valve 5.
Description
Technical field
The present invention relates to constitute the frequency conversion type air conditioning freeze cycle the electric expansion valve open degree control method and use the air-conditioning of this method.
Background technology
Usually, the freeze cycle be made up of as shown in Figure 4 compressor 1, four-way valve 2, indoor heat converter 3, outdoor heat converter 4 and electric expansion valve 5 of air-conditioning constitutes.This air-conditioning by control four-way valve 2, makes cooling media along beginning to flow back to indoor heat converter 3 according to the order of compressor 1, outdoor heat converter 4, electric expansion valve 5 from indoor heat converter 3 shown in the dotted arrow when cooling operation.Like this, make indoor heat converter 3 absorb heat on every side as evaporimeter.On the other hand, the rotation of the control room internal fans of setting according to remote controller such as air quantity will blow to indoor by the cold wind of heat exchanger 3 heat exchanges.And, poor according to the design temperature of indoor temperature and remote controller, make compressor 1 by fixed operating frequency running with the control room temperature.
And when heating running, opposite with cooling operation, control four-way valve 2 makes cooling media along beginning to flow back to outdoor heat converter 4 according to the order of compressor 1, indoor heat converter 3, electronic expansion device 5 from outdoor heat converter 4 shown in the solid arrow.Like this, make indoor heat converter emit heat towards periphery as condensed device.On the other hand, the rotation of the control room internal fans of setting according to remote controller such as air quantity will blow to indoor by the warm braw of heat exchanger 3 heat exchanges.And, poor according to the design temperature of indoor temperature and remote controller, make compressor 1 by fixed operating frequency running with the control room temperature.
For carrying out above-mentioned refrigeration and heat running, air-conditioning is equipped with as shown in Figure 5 by the drive circuit of microcomputer, motor etc., by other indoor set control part of forming 6 and off-premises station control part 7.
Outdoor control part 7 is according to this instruction control compressor 1.
Further, air-conditioning also is equipped with the outdoor heat exchange temperature sensor 13 of the temperature of the indoor heat converter temperature sensor 11 of the temperature of measuring indoor heat converter 3, the suction temperature sensor 12 of measuring the inlet temperature of compressor 1, measuring cell outer heat-exchanger 4.
In turn above-mentioned compressor, condensed device, expansion valve, evaporimeter are coupled together in the freeze cycle that forms with the cooling media pipe arrangement, when compressor was carried out VFC, the discharge pressure of compressor was by decisions such as environment for use temperature, fan wind speed, compressor rotary speeds.In addition, the cooling media flow is determined by the discharge pressure of compressor and the flow path resistance of freeze cycle.So, stably carry out for making freeze cycle, when compressor rotary speed is controlled, be necessary to change expansion valve open degree so that the flow of the cooling media that flows in the freeze cycle reach fixed value.
On the other hand, in the flow of the cooling media that flows through evaporimeter, there is an optimum flow corresponding to air themperature and air quantity by the evaporimeter heat exchange.That is, flow through evaporimeter cooling media the flow-rate ratio optimum flow after a little while, cooling media can be evaporated among by evaporimeter.As a result, the cooling media of gasification is overheated in evaporimeter, thereby evaporator outlet temperature rises, and the evaporimeter heat exchanger effectiveness descends.In addition, flow through evaporimeter cooling media the flow-rate ratio optimum flow for a long time, the cooling media in the evaporimeter can not evaporate fully.
As a result, evaporator outlet is still discharged liquid cooling media, and this liquid cooling media is sucked by compressor and causes the liquid backflow phenomenon, can become the reason of compressor injury.
For solving above problem, by frequency conversion etc. compressor to be carried out in the freeze cycle of speed Control, use can be controlled the electric expansion valve of expansion valve open degree.Like this, remain on optimum flow usually by the feasible cooling media amount of the open degree of control expansion valve by evaporimeter.
The control method publicity of expansion valve open degree is on Japanese kokai publication hei 10-267430 communique (the 1st page).This control method was known as thermal control, promptly measured the inlet temperature of compressor and the temperature of evaporimeter, made their poor (being referred to as (S-H) amount) keep certain by the open degree of controlling expansion valve.This method is utilized the following fact, promptly, because the suction inlet of compressor is connected with the outlet of evaporimeter by the cooling media pipe arrangement, if the flow of cooling media is suitable, the temperature of the cooling media in the compressor suction (inlet temperature) temperature of the discharge cooling media of a little higher than evaporimeter only then.Yet, in this control method, will inevitably postpone if having time between the changes in flow rate of cooling media and the variations in temperature of mensuration, therefore, for rapid variation of indoor temperature etc., it is synchronous that control can't keep.As a result, the open degree that can produce the expansion valve that is referred to as oscillatory occurences is as shown in Figure 6 done big fluctuation thereon down with respect to desired value.When this oscillatory occurences takes place,, take place thereby cause indoor environment to worsen such problem because the freeze cycle action is unstable.Here, for suppressing backflow phenomenon various methods have been proposed.For example, in above-mentioned existing example, following method has been proposed.That is, monitor (S-H) amount in fixed time, and this (S-H) amount reached the above number of times of 1st setting value also higher than goal-setting value and reach the 2nd setting value following number of times also lower than goal-setting value count.Simultaneously, determine the maximum and the minimum of a value of expansion valve open degree in the supervision, when said counting number during more than institute's definite value, in fixed time the open degree of expansion valve be fixed as the mean value of above-mentioned maximum and minimum of a value.Control like this.
Yet, in the above-mentioned existing formation, be subjected to being derived from the inlet temperature of the big compressor of the open degree influence of expansion valve by utilization, by closed-loop path control and expansion valve is controlled, be impossible on principle with this oscillation-damped.In other words, on the point that makes extreme vibration convergence, be effectively, but can not prevent the vibration of some degree.In addition, expansion valve needs long time till being stabilized in optimum value, and during this period, can't avoid freeze cycle and instability occur, therefore, the necessary complicated problems such as control procedure that adopt occurred.
Summary of the invention
The objective of the invention is to provides a kind of oscillation-damped fully and freezing media flow can promptly be stabilized in air-conditioning and control method thereof on the optimum value for solving existing issue.
The invention provides a kind of air-conditioning with control device of control expansion electronic valve open degree, this air-conditioning has by the cooling media pipe arrangement in turn with the power variable compressor, indoor heat converter, electric expansion valve, the freeze cycle that outdoor heat converter couples together, the heat of above-mentioned indoor heat converter is passed Air Blast fan in indoor speed variable cells, measure the compressor rotary speed determinator of above-mentioned compressor rotating speed, indoor temperature determinator and outdoor temperature determinator, utilize the output of above-mentioned compressor rotational speed detecting device, above-mentioned indoor temperature determinator output, above-mentioned outdoor temperature determinator output and above-mentioned indoor Air Blast fan velocity information, the open degree of controlling above-mentioned electric expansion valve is so that the efficient maximum of evaporimeter.
Description of drawings
Fig. 1 is the block diagram of the air-conditioner control system in the embodiment of the invention.
Fig. 2 is the performance plot of expression with respect to the benchmark expansion valve open degree of compressor of air conditioner rotating speed.
Fig. 3 is the performance plot that concerns between expression environmental coefficient of air-conditioning and the expansion valve open degree ratio.
Fig. 4 is the summary composition diagram of expression air-condition freezing circulation.
Fig. 5 is the block diagram of the control system of existing air-conditioning.
Fig. 6 is the performance plot of the vibration form of the existing compressor of air conditioner of explanation
The specific embodiment
Followingly describe with regard to embodiments of the invention with reference to accompanying drawing.
Fig. 1 is the summary block diagram of the control system of air-conditioning in the embodiment of the invention.Among Fig. 1 for Fig. 5 in identical element use identical symbol, and omitted explanation to it.In addition, the freeze cycle here and Fig. 4 have same composition.
Indoor set control part 6 among Fig. 1 is fetched the signal that is derived from indoor temperature transmitter 8 and other grades, and indoor Air Blast fan 10 and other are controlled.Export indoor temperature, indoor Air Blast fan velocity information and other necessary information from indoor control part 6 to off-premises station control part 71.
Below, the expansion valve open degree when how calculation block 71a is calculated the evaporator effectiveness of sening as an envoy to for maximum describes.
Fig. 2 is the performance plot of expression with respect to the benchmark expansion valve open degree of compressor of air conditioner rotating speed, the expansion valve open degree with respect to compressor rotary speed (benchmark expansion valve open degree) the when evaporator effectiveness of obtaining when promptly air-conditioning turns round under the standard performance experimental condition is maximum.Represented the expansion valve open degree with the umber of pulse of powering among the figure to the stepping motors that drives electric expansion valve.The moment of a certain open degree of expansion valve is made as 0, thus with expansion valve reach fixed open degree necessary, count to the umber of pulse of stepping motors power supply.When the relation between compressor rotary speed of obtaining like this and the benchmark expansion valve open degree is represented with empirical equation, as shown in Equation 1.
Phz=k11+k12 * N-k13 * N
2(formula 1)
Wherein, Phz is a benchmark expansion valve open degree (umber of pulse), and N is compressor rotary speed (rotations/sec), and k11, k12, k13 are the constants that depends on the air-conditioning specification.In a cooling operation experimental example, k11=59, k12=3.147, k13=0.01241.
And the best open degree of expansion valve owing to making actual rapid steamer heat exchanger effectiveness become maximum determines by the combination of compressor rotary speed and air conditioner load, so, be necessary above-mentioned benchmark expansion valve open degree to be revised according to loading condiction.Therefore, defined among the present invention as the coefficient of representing loading condiction, with the environmental coefficient Tk of the function representation of indoor temperature, outdoor temperature and indoor Air Blast fan wind speed.Then, obtain that compressor rotary speed is certain, each expansion valve open degree when environmental coefficient makes the evaporimeter heat exchanger effectiveness become maximum when changing.Further, with this expansion valve open degree divided by the value of benchmark expansion valve open degree as expansion open degree ratio, and obtain the relation of environmental coefficient and expansion valve open degree ratio.
Particularly, when indoor temperature is Tin, outdoor temperature is Tout, and when indoor Air Blast fan wind speed coefficient was a, environmental coefficient Tk was with formula 2 definition.
Tk=(Tin+0.1 * Tout) * a (formula 2)
As an example, for the air-conditioning that uses, the wind speed of its indoor fan can by strong, in, weak third gear regulates.At this moment, consider the actual draft capacity of fan, corresponding to strong, in, weak wind speed coefficient a with indoor fan is taken as 1,0.95,0.9 respectively and calculates.
The relation of environmental coefficient of Ce Dinging and expansion valve open degree ratio as shown in Figure 3 as mentioned above.When the relation of environmental coefficient of obtaining like this and expansion valve open degree ratio is represented with empirical equation, as shown in Equation 3.
P=k31-k32 * Tk+k33 * Tk
2(formula 3)
Wherein, p is an expansion valve open degree ratio (umber of pulse), and k31, k32, k33 are the constants that depends on the air-conditioning specification.
In the example of cooling operation experiment, k31=0.87657, k32=0.018356, k33=0.00072762.
Be provided with microcomputer among the calculation block 71a and have the holder that carries out Program for Calculation with formula 1, formula 2 and formula 3.
So, can utilize formula 1 to calculate benchmark expansion valve open degree by compressor rotary speed.Further, calculation block 71a utilizes formula 3 to calculate expansion valve open degree ratio by environmental coefficient after utilizing formula 2 to calculate environmental coefficient by indoor temperature, outdoor temperature and indoor Air Blast fan wind speed coefficient.
This expansion valve open degree ratio and benchmark expansion valve open degree are to be amassed by obtaining, and just can draw the optimum expansion opening of valves degree of this compressor rotary speed, indoor temperature, outdoor temperature, indoor fan wind speed.By utilizing this optimum expansion opening of valves degree that electric expansion valve is controlled, can realize not using conduct used in the control to import the control of the key element that influences the expansion valve open degree of information.
Like this, vibration just can not occur, and can realize freeze cycle running stably.
Above-mentioned explanation is the explanation of the constant in each formula during to cooling operation, when heating running, these constants must be changed into different values and control.
In addition, in the above embodiments explanation, calculate the computing formula of programming in advance, also be illustrated thereby calculate optimum expansion opening of valves degree for the microcomputer of being located in the usefulness in the calculation block.In addition, result of calculation is stored in the holder as data in advance, reads data then, and control, also can reach same effect corresponding to rotating speed that determines and evaporator temperature.
As mentioned above, the present invention has following effect: utilize the rotating speed be not subjected to the compressor that the expansion valve open degree influences and by indoor temperature, outside humidity, the indoor fan wind speed of air conditioner load decision, calculate the optimum expansion open degree, and control, just can realize stable freeze cycle control thereby can not need carry out complicated FEEDBACK CONTROL.
Claims (3)
1. air-conditioning, comprise: by the cooling media pipe arrangement successively with the compressor of power variable, indoor heat converter, electric expansion valve, the freeze cycle that outdoor heat converter couples together, the heat of above-mentioned indoor heat converter is sent to the variable indoor Air Blast fan of indoor speed, measure the compressor rotary speed determinator of above-mentioned compressor rotating speed, indoor temperature determinator and outdoor temperature determinator, it is characterized in that: have the output of the above-mentioned compressor of utilization rotational speed detecting device, above-mentioned indoor temperature determinator output, above-mentioned outdoor temperature is measured output and above-mentioned indoor Air Blast fan velocity information, and control electric expansion valve open degree is so that evaporator effectiveness is maximum control device.
2. the control method of an air-conditioning, wherein air-conditioning comprises: by the cooling media pipe arrangement successively with the compressor of power variable, indoor heat converter, electric expansion valve, the freeze cycle that outdoor heat converter couples together, the heat of above-mentioned indoor heat converter is sent to the variable indoor Air Blast fan of indoor speed, measure the compressor rotary speed determinator of above-mentioned compressor rotating speed, indoor temperature determinator and outdoor temperature determinator, it is characterized in that: in the air-conditioning condition determination that is made as a timing for the condition except that the above-mentioned compressor rotating speed, the computing formula of utilizing experiment in advance to draw, the electric expansion valve open degree of being calculated when making evaporator effectiveness be maximum by the above-mentioned compressor rotating speed is a benchmark expansion valve open degree, then, corresponding to by indoor temperature, the environmental coefficient that outdoor temperature and indoor Air Blast fan velocity information calculate, electric expansion valve open degree when the formula that utilizes experiment in advance to draw calculates the evaporator effectiveness of sening as an envoy to for maximum is divided by the expansion valve open degree ratio of said reference expansion valve open degree gained, then, the expansion valve open degree that utilization is calculated by the long-pending of said reference expansion valve open degree and above-mentioned expansion valve open degree ratio is controlled above-mentioned electric expansion valve.
3. the control method of air-conditioning according to claim 2, it is characterized in that: obtain substituting of said reference expansion valve open degree and above-mentioned expansion valve open degree ratio as the computing formula that the experiment that utilizes in advance draws, will with respect to above-mentioned compressor rotating speed and environmental coefficient make evaporator effectiveness be maximum the time the electric expansion valve open degree be stored in advance in the storage device, utilize the data that store in the said storage unit that the open degree of above-mentioned electric expansion valve is controlled.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003004462 | 2003-01-10 | ||
| JP2003004462A JP2004218879A (en) | 2003-01-10 | 2003-01-10 | Air conditioner and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1517626A true CN1517626A (en) | 2004-08-04 |
| CN1229612C CN1229612C (en) | 2005-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100003294A Expired - Fee Related CN1229612C (en) | 2003-01-10 | 2004-01-07 | Air conditioner and its control method |
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| JP (1) | JP2004218879A (en) |
| CN (1) | CN1229612C (en) |
Cited By (17)
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|---|---|---|---|---|
| CN102081412A (en) * | 2009-10-21 | 2011-06-01 | 惠而浦股份公司 | Data and commands communication system and method between variable capacity compressor and electronic thermostat for a cooling system |
| CN101089494B (en) * | 2006-06-16 | 2011-07-06 | 乐金电子(天津)电器有限公司 | Control method for electronic expansion valve of air conditioner |
| CN102175052A (en) * | 2008-03-18 | 2011-09-07 | Lg电子株式会社 | Air conditioner and control method thereof |
| CN102378884A (en) * | 2009-03-30 | 2012-03-14 | 三菱电机株式会社 | Refrigeration cycle device |
| CN102538127A (en) * | 2010-12-23 | 2012-07-04 | 珠海格力电器股份有限公司 | Handheld adjusting device and system of variable frequency air conditioner |
| 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 |
| CN103344069A (en) * | 2013-06-26 | 2013-10-09 | 广东美的制冷设备有限公司 | Method and device for controlling electronic expansion valve |
| CN103851817A (en) * | 2012-11-29 | 2014-06-11 | 松下电器产业株式会社 | Refrigerating device |
| CN106568165A (en) * | 2016-11-02 | 2017-04-19 | 广东美的暖通设备有限公司 | Adjustment method and adjustment system for electronic expansion valve of air conditioner, and air conditioner |
| CN107709066A (en) * | 2015-06-25 | 2018-02-16 | 三电汽车空调系统株式会社 | Air conditioner for vehicles |
| CN108375249A (en) * | 2018-02-08 | 2018-08-07 | 广东高而美制冷设备有限公司 | A kind of tune valve method and apparatus of anti-attenuation |
| WO2018188522A1 (en) * | 2017-04-13 | 2018-10-18 | 青岛海尔空调器有限总公司 | Air conditioner heating operation control method |
| CN109323427A (en) * | 2018-11-02 | 2019-02-12 | 青岛海尔空调器有限总公司 | A kind of control method of air conditioner room unit, device, air conditioner and storage medium |
| CN109386996A (en) * | 2018-10-08 | 2019-02-26 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve and air conditioning system |
| CN109442825A (en) * | 2018-09-12 | 2019-03-08 | 广东芬尼科技股份有限公司 | A kind of ultralow temperature frequency conversion heat pump system and its control method and device |
| CN111483286A (en) * | 2019-01-25 | 2020-08-04 | 郑州宇通客车股份有限公司 | Method and device for calculating opening degree of regulating valve of vehicle air conditioning system |
| WO2023098589A1 (en) * | 2021-12-01 | 2023-06-08 | Qingdao Haier Air Conditioner General Corp., Ltd. | Method of operating an electronic expansion valve in an air conditioner unit |
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| KR102391331B1 (en) * | 2017-10-24 | 2022-04-28 | 삼성전자주식회사 | Air conditioner system and control method thereof |
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2003
- 2003-01-10 JP JP2003004462A patent/JP2004218879A/en active Pending
-
2004
- 2004-01-07 CN CNB2004100003294A patent/CN1229612C/en not_active Expired - Fee Related
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| CN101089494B (en) * | 2006-06-16 | 2011-07-06 | 乐金电子(天津)电器有限公司 | Control method for electronic expansion valve of air conditioner |
| CN102175052A (en) * | 2008-03-18 | 2011-09-07 | Lg电子株式会社 | Air conditioner and control method thereof |
| CN102175052B (en) * | 2008-03-18 | 2014-03-12 | Lg电子株式会社 | Air conditioner and control method thereof |
| CN102378884A (en) * | 2009-03-30 | 2012-03-14 | 三菱电机株式会社 | Refrigeration cycle device |
| US8806877B2 (en) | 2009-03-30 | 2014-08-19 | Mitsubishi Electric Corporation | Refrigerating cycle apparatus |
| CN102081412A (en) * | 2009-10-21 | 2011-06-01 | 惠而浦股份公司 | Data and commands communication system and method between variable capacity compressor and electronic thermostat for a cooling system |
| CN102081412B (en) * | 2009-10-21 | 2014-10-22 | 惠而浦股份公司 | Data and commands communication system and method for a cooling system |
| CN102538127A (en) * | 2010-12-23 | 2012-07-04 | 珠海格力电器股份有限公司 | Handheld adjusting device and system of variable frequency air conditioner |
| 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 |
| CN103851817B (en) * | 2012-11-29 | 2017-06-13 | 松下电器产业株式会社 | Refrigerating plant |
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| CN103344069B (en) * | 2013-06-26 | 2015-09-30 | 广东美的制冷设备有限公司 | The control method of electric expansion valve and device |
| CN103344069A (en) * | 2013-06-26 | 2013-10-09 | 广东美的制冷设备有限公司 | Method and device for controlling electronic expansion valve |
| CN107709066A (en) * | 2015-06-25 | 2018-02-16 | 三电汽车空调系统株式会社 | Air conditioner for vehicles |
| CN107709066B (en) * | 2015-06-25 | 2020-11-13 | 三电汽车空调系统株式会社 | Air conditioner for vehicle |
| CN106568165B (en) * | 2016-11-02 | 2019-05-17 | 广东美的暖通设备有限公司 | A kind of adjusting method of air conditioner electronic expansion valve, system and air conditioner |
| CN106568165A (en) * | 2016-11-02 | 2017-04-19 | 广东美的暖通设备有限公司 | Adjustment method and adjustment system for electronic expansion valve of air conditioner, and air conditioner |
| WO2018188522A1 (en) * | 2017-04-13 | 2018-10-18 | 青岛海尔空调器有限总公司 | Air conditioner heating operation control method |
| CN108375249A (en) * | 2018-02-08 | 2018-08-07 | 广东高而美制冷设备有限公司 | A kind of tune valve method and apparatus of anti-attenuation |
| CN109442825A (en) * | 2018-09-12 | 2019-03-08 | 广东芬尼科技股份有限公司 | A kind of ultralow temperature frequency conversion heat pump system and its control method and device |
| CN109386996A (en) * | 2018-10-08 | 2019-02-26 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve and air conditioning system |
| CN109323427A (en) * | 2018-11-02 | 2019-02-12 | 青岛海尔空调器有限总公司 | A kind of control method of air conditioner room unit, device, air conditioner and storage medium |
| CN109323427B (en) * | 2018-11-02 | 2023-08-25 | 青岛海尔空调器有限总公司 | Control method and device for indoor unit of air conditioner, air conditioner and storage medium |
| CN111483286A (en) * | 2019-01-25 | 2020-08-04 | 郑州宇通客车股份有限公司 | Method and device for calculating opening degree of regulating valve of vehicle air conditioning system |
| CN111483286B (en) * | 2019-01-25 | 2022-10-18 | 宇通客车股份有限公司 | Method and device for calculating opening degree of regulating valve of vehicle air conditioning system |
| WO2023098589A1 (en) * | 2021-12-01 | 2023-06-08 | Qingdao Haier Air Conditioner General Corp., Ltd. | Method of operating an electronic expansion valve in an air conditioner unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1229612C (en) | 2005-11-30 |
| JP2004218879A (en) | 2004-08-05 |
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