KR20050015541A - Method of controlling electronic expansion valve for air-conditioner - Google Patents

Method of controlling electronic expansion valve for air-conditioner

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Publication number
KR20050015541A
KR20050015541A KR1020030054405A KR20030054405A KR20050015541A KR 20050015541 A KR20050015541 A KR 20050015541A KR 1020030054405 A KR1020030054405 A KR 1020030054405A KR 20030054405 A KR20030054405 A KR 20030054405A KR 20050015541 A KR20050015541 A KR 20050015541A
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KR
South Korea
Prior art keywords
expansion valve
electronic expansion
compressor
opening degree
air conditioner
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Application number
KR1020030054405A
Other languages
Korean (ko)
Inventor
최귀진
양승대
Original Assignee
위니아만도 주식회사
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Application filed by 위니아만도 주식회사 filed Critical 위니아만도 주식회사
Priority to KR1020030054405A priority Critical patent/KR20050015541A/en
Publication of KR20050015541A publication Critical patent/KR20050015541A/en

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Classifications

    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

PURPOSE: A control method of an electronic expansion valve for an air conditioner is provided to improve the stability of the system by controlling the opening degree of the electronic expansion valve quickly in starting a compressor early and controlling the opening degree of the electronic expansion valve slowly after stabilizing the system. CONSTITUTION: An electronic expansion valve is initialized(10), and the opening degree of the electronic expansion valve is initialized according to frequency of two compressors by transmitting the signals to two compressors(20,30). Two compressors are operated, and the electronic expansion valve is controlled for three minutes in starting by the opening degree equation and three minutes later by the opening degree equation(40,50,60). Two compressors are stopped(70), and the electronic expansion valve is opened(80). One compressor is stopped, and the other compressor is operated continuously(71). The opening degree of the electronic expansion valve is initialized with the frequency of 170 pulse(81). The electronic expansion valve is controlled for three minutes by the opening degree equation and three minutes later by the opening degree equation(90,100). The operating compressor is stopped, and the electronic expansion valve is initialized(110,120).

Description

에어컨의 전자 팽창 밸브 제어방법 {Method of controlling electronic expansion valve for air-conditioner}Method of controlling electronic expansion valve for air-conditioner

본 발명은 인버터 에어컨의 전자 팽창 밸브의 제어를 압축기 초기 기동 및 안전 진입 후로 나누어 제어함으로써, 압축기의 신뢰성을 확보하여 시스템의 안정을 확보하기 위한 에어컨의 전자 팽창 밸브 제어방법에 관한 것이다. The present invention relates to a control method of the electronic expansion valve of the air conditioner to secure the stability of the system by ensuring the reliability of the compressor by controlling the control of the electronic expansion valve of the inverter air conditioner after the compressor initial start and safe entry.

일반적으로, 에어컨은 냉매를 상온에서 증발시켜 주변의 대기로부터 열을 빼앗아 대기를 냉각시키는 장치를 말하는 것으로, 분리형과 일체형으로 나눌 수 있고, 보통 분리형 에어컨은 실외기의 압축기에서 압축된 냉매를 응축기에서 액화시킨 뒤 팽창밸브를 통해 실내기의 증발기에서 다시 기화시켜 실내를 냉각하게 된다.In general, an air conditioner refers to a device that cools the atmosphere by evaporating a refrigerant at room temperature to extract heat from the surrounding atmosphere. The air conditioner may be divided into a separate type and an integrated type. Usually, a separate air conditioner liquefies refrigerant compressed in an outdoor unit compressor in a condenser. After cooling, the expansion is evaporated in the evaporator of the indoor unit to cool the room.

한편, 최근의 에어컨은 냉방용량을 자동 제어함으로써, 실내온도를 설정온도와 가깝게 유지되도록 하는 냉방용량 조절 시스템이 구비되어 있는데, 이러한 냉방용량 조절 시스템은, 정속 압축기 한 대를 사용한 단순제어식과, 가변 압축기를 사용한 가변제어식(통상, 인버터 에어컨이라 함.)과, 정속 압축기 두 대 이상을 사용한 복합제어식(통상, 멀티에어컨이라 함.)으로 구분된다. On the other hand, the recent air conditioner is equipped with a cooling capacity control system to maintain the room temperature close to the set temperature by automatically controlling the cooling capacity, such a cooling capacity control system, a simple control type using a constant speed compressor, variable It is divided into a variable control type using a compressor (usually called an inverter air conditioner) and a complex control type using two or more constant speed compressors (commonly referred to as a multi-air conditioner).

첨부 도면 중, 도 1은 종래 인버터 에어컨의 냉매순환도이다. 1 is a refrigerant circulation diagram of a conventional inverter air conditioner.

도 1에 도시된 바와 같이, 인버터 에어컨은 일반적으로 실외기에 압축기(1)와 응축기(2)와 냉각팬(3) 및 전자 팽창 밸브(4)가 구성되고, 실내기에 증발기(5)와 송풍팬(6)이 구성된다. As shown in FIG. 1, an inverter air conditioner generally includes an compressor 1, a condenser 2, a cooling fan 3, and an electronic expansion valve 4 in an outdoor unit, and an evaporator 5 and a blower fan in an indoor unit. (6) is configured.

이와 같이 구성된 에어컨의 동작을 살펴보면, 에어컨이 운전된 후 초기에는 압축기(1)에서 고온ㆍ고압으로 압축된 냉매가 응축기(2)를 통해 열교환되어 상온ㆍ고압의 액냉매로 변화되고, 상기 액냉매는 전자 팽창 밸브(4)를 통과하면서 감압되어 저온ㆍ저압의 액냉매로 된 후 증발기(5)로 유입되며, 상기 액냉매는 상기 증발기(5)에서 실내 공기와 열교환된 후 기체 냉매로 변화하여 다시 상기 압축기(1)로 들어간다. Referring to the operation of the air conditioner configured as described above, after the air conditioner is operated, the refrigerant compressed at high temperature and high pressure in the compressor 1 is heat-exchanged through the condenser 2 to be converted into a liquid refrigerant having a normal temperature and high pressure. Is decompressed while passing through the electronic expansion valve (4) to form a low-temperature, low-pressure liquid refrigerant and then flows into the evaporator (5), the liquid refrigerant is converted into a gas refrigerant after heat exchange with the indoor air in the evaporator (5) The compressor 1 is again entered.

이러한 과정을 반복함으로써 실내온도 조건이 조절되는데, 압축기(1) 운전시 하나의 개도식에 의해 전자 팽창 밸브(4)를 제어하며, 이렇게 하다보니 초기 압축기(1) 기동과 함께 시스템이 급변하는 것에 대응하지 못하였다. By repeating this process, the room temperature condition is adjusted. When the compressor 1 is operated, the solenoid expansion valve 4 is controlled by one opening formula. As a result, the system changes rapidly with the initial compressor 1 startup. It did not respond.

즉, 실내 온도 조건을 맞추기 위해서는 압축기(1)에 맞추어 전자 팽창 밸브(4)의 개도를 조절해야 하는데, 보통 에어컨의 부하 상태를 고려하지 않고 하나의 일정한 개도식에 따라 전자 팽창 밸브(4)를 연 상태에서 압축기(1)를 운전시켰으며, 이에 따라 초기 압축기(1) 기동과 함께 시스템이 급변하는 것에 대응하지 못하였다. That is, in order to meet room temperature conditions, the opening degree of the solenoid expansion valve 4 must be adjusted in accordance with the compressor 1. Usually, the solenoid expansion valve 4 is adjusted according to one constant opening formula without considering the load condition of the air conditioner. The compressor 1 was operated in the open state, and thus, the initial compressor 1 startup did not correspond to the sudden change of the system.

이와 같이, 종래에는 이러한 여러가지 환경에 대해서 전자 팽창 밸브(4)의 초기 개도를 설정하는데 문제가 있었다. As described above, there has been a conventional problem in setting the initial opening degree of the electromagnetic expansion valve 4 for these various environments.

상기한 바와 같이, 종래의 인버터 에어컨은 전자 팽창 밸브를 제어하는데 있어서 시스템이 급변하는 것에 대응하지 못하는 문제점이 있었으며, 이는 결국 에어컨 운전시 하나의 일정한 개도식에 따라 전자 팽창 밸브를 연 상태에서 압축기를 운전시켰기 때문이며, 이를 해결하기 위해서는 전자 팽창 밸브의 제어를 압축기 초기 기동 및 안전 진입 후로 나누어 제어하는 것이 필요하다. As described above, the conventional inverter air conditioner has a problem in that the system does not respond to a sudden change in controlling the electronic expansion valve, which is the result of opening the compressor in the state of opening the electronic expansion valve in accordance with one constant opening formula during operation of the air conditioner. In order to solve this problem, it is necessary to divide and control the control of the electromagnetic expansion valve by the compressor initial start and after safety entry.

따라서, 본 발명의 목적은 인버터 에어컨의 전자 팽창 밸브의 제어를 압축기 초기 기동 및 안전 진입 후로 나누어 제어함으로써, 압축기의 신뢰성을 확보하여 시스템의 안정을 확보하는 데에 있다. Accordingly, an object of the present invention is to secure the stability of the system by securing the reliability of the compressor by controlling the electronic expansion valve of the inverter air conditioner by dividing and controlling the compressor after the initial start and the safe start.

상기 목적을 달성하기 위한 에어컨의 전자 팽창 밸브 제어방법은, Electronic expansion valve control method of the air conditioner for achieving the above object,

압축기 기동 초기에는 전자 팽창 밸브의 개도를 빠르게 제어하고, 시스템이 안정된 후에는 전자 팽창 밸브의 개도를 천천히 제어하도록 전자 팽창 밸브 개도식을 구성함으로써 이루어진다. The opening of the solenoid expansion valve is controlled quickly at the start of the compressor, and after the system is stabilized, the solenoid expansion valve opening formula is configured to slowly control the opening of the solenoid expansion valve.

이때, 상기 전자 팽창 밸브 개도식의 계수값은, 압축기 기동 초기의 계수값이 그 이후의 계수값보다 큰 것을 특징으로 한다. At this time, the count value of the electromagnetic expansion valve opening formula is characterized in that the count value at the initial stage of the compressor start is larger than the count value thereafter.

이하, 본 발명의 바람직한 실시 예를 첨부한 도면에 따라서 상세히 설명하기로 한다. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

첨부 도면 중, 도 2는 본 발명에 의한 인버터 에어컨의 전자 팽창 밸브 제어 흐름도이다. In the accompanying drawings, FIG. 2 is a flowchart illustrating an electromagnetic expansion valve control of the inverter air conditioner according to the present invention.

도 2에 도시된 바와 같이, 본 발명에 의한 인버터 에어컨의 전자 팽창 밸브 제어 방법은, 압축기의 초기 기동(3분간) 및 안전 진입 후(3분 이후)로 나누어 전자 팽창 밸브를 제어한다. As shown in FIG. 2, the method for controlling the electromagnetic expansion valve of the inverter air conditioner according to the present invention controls the electronic expansion valve by dividing into the initial start of the compressor (3 minutes) and after the safe entry (after 3 minutes).

먼저 1단계(10)는 전자 팽창 밸브를 초기화하고, 2단계(20)는 두개의 압축기에 모두 운전 신호를 보내며, 3단계(30)는 두 압축기의 주파수(200pulse)에 맞추어 전자 팽창 밸브를 초기 개도한다. First step 10 initializes the electronic expansion valve, second step 20 sends an operation signal to both compressors, and third step 30 initiates the electronic expansion valve in accordance with the frequency of the two compressors (200 pulses). Dogs open.

그리고, 4단계(40)는 두개의 압축기를 모두 운전하고, 5단계(50)는 초기 기동 3분 동안 개도식 #1에 의해 전자 팽창 밸브를 제어하며, 6단계(60)는 3분 이후 개도식 #1-1에 의해 전자 팽창 밸브를 제어한다. In addition, step 4 (40) operates both compressors, step 5 (50) controls the electronic expansion valve by opening formula # 1 for the initial 3 minutes, and step 6 (60) opens after 3 minutes. The electromagnetic expansion valve is controlled by Scheme # 1-1.

여기에서, 개도식 #1과 #1-1은 계수의 값이 틀린 식으로, 개도식 #1은Here, the opening equations # 1 and # 1-1 are equations with different coefficients, and the opening equation # 1 is

EO=A + Kp＊B + Ki＊D＊Ts 이고, 개도식 #1-1에는 상기 개도식 #1의 비례계수(Kp)와 적분계수(Ki)보다 작은 값을 넣으면 된다. It is EO = A + Kp * B + Ki * D * Ts and a value smaller than the proportional coefficient (Kp) and the integral coefficient (Ki) of the opening formula # 1 may be put in the opening formula # 1.

즉, 개도식 #1-1은 That is, opening formula # 1-1

EO=A + Kp'＊B + Ki'＊D＊Ts (여기에서 Kp'< Kp 이고, Ki'< Ki 이다)로 표현할 수 있다.It can be expressed as EO = A + Kp '* B + Ki' * D * Ts (where Kp '<Kp and Ki' <Ki).

이상, 간단히 개도식 #1과 #1-1을 살펴본 것으로, 식의 문자와 계수의 설명 및 자세한 비교 내용은 아래 표를 참조하여 설명하기로 하고, 다음 단계를 살펴보기로 한다. As described above, the schematics # 1 and # 1-1 have been briefly described, and the description and detailed comparison of the letters and coefficients of the equation will be described with reference to the following table, and the next step will be described.

6단계(60)까지는 두개의 압축기를 모두 운전한 것으로, 이후에는 두 압축기를 모두 정지하는 경로와, 하나의 압축기만 정지하고 다른 하나는 운전하는 경로로 나눌 수 있다. Up to step 60, both compressors are operated, and after that, the two compressors may be divided into a path for stopping both compressors and a path for stopping only one compressor and driving the other.

먼저 첫번째 경로는, 7단계(70)에서 압축기를 둘다 정지하고, 8단계(80)에서는 전자 팽창 밸브를 열어 다시 초기 상태로 돌아가게 한다. First, the first route stops both compressors in step 70 and in step 80 opens the electronic expansion valve to return to the initial state.

그리고, 두번째 경로는, 7-1단계(71 ; 7단계와 구분하기 위해 편의상 7-1단계라고 함.)에서 하나의 압축기를 정지하고 나머지는 계속 운전하며, 8-1단계(81)에서 하나의 압축기를 운전하는 상태의 주파수(170pulse)로 전자 팽창 밸브를 초기 개도한다. And, the second path, one compressor in step 7-1 (71 (step 7-1 for convenience to distinguish it from step 7)) stops and the other continues to operate, one in step 8-1 (81) The electronic expansion valve is initially opened at a frequency (170 pulses) in the state of operating the compressor.

이후, 9단계(90)와 10단계(100)는 하나의 압축기만 운전할 때의 전자 팽창 밸브를 제어하는 단계로, 9단계(90)는 초기 기동 3분 동안 개도식 #2에 의해 전자 팽창 밸브를 제어하고, 10단계(100)는 3분 이후 개도식 #2-1에 의해 전자 팽창 밸브를 제어한다. Subsequently, steps 9 and 10 are steps of controlling the electronic expansion valve when only one compressor is operated, and step 9 (90) is the electronic expansion valve by opening formula # 2 for an initial three minutes. And, step 10 (100) after 3 minutes to control the electronic expansion valve by the opening formula # 2-1.

이때, 개도식 #2와 #2-1은 위에 설명한 개도식 #1과 #1-1의 관계와 마찬가지로, 계수의 값이 틀린 식으로서, 개도식 #2는At this time, the opening equations # 2 and # 2-1 are equations with different coefficients, similar to the relationship between the opening equations # 1 and # 1-1 described above.

EO=A + Kp＊C + Ki＊D＊Ts 이고, 개도식 #2-1은 EO = A + Kp * C + Ki * D * Ts and opening formula # 2-1

EO=A + Kp'＊C + Ki'＊D＊Ts (Kp'< Kp, Ki'< Ki)이다.EO = A + Kp '* C + Ki' * D * Ts (Kp '<Kp, Ki' <Ki).

이후, 11단계(110)에서는 운전되고 있는 하나의 압축기를 마저 정지하고, 12단계(120)에서는 전자 팽창 밸브를 열어 다시 초기 상태로 돌아가게 한다. Thereafter, in step 110, one compressor that is being operated is stopped even, and in step 12, the electronic expansion valve is opened to return to the initial state.

여기에서, 아래 표를 살펴보면, 압축기 기동 초기(3분간)와 그 이후(3분 이후)에, 각각 두개의 압축기를 운전할 때와 하나의 압축기를 운전할 때, 어느 개도식을 적용해야하는지 나타내고 있다. Here, the table below shows which opening formula should be applied when the two compressors are operated and when one compressor is operated, respectively, at the beginning of the compressor start (3 minutes) and after (after 3 minutes).

개도식 #1; EO=A + Kp＊B + Ki＊D＊TsOpening Scheme # 1; EO = A + Kp ＊ B + Ki ＊ D ＊ Ts

개도식#1-1; EO=A + Kp'＊B + Ki'＊D＊Ts (Kp'< Kp , Ki'< Ki)Opening formula # 1-1; EO = A + Kp '＊ B + Ki' ＊ D ＊ Ts (Kp '<Kp, Ki' <Ki)

개도식 #2; EO=A + Kp＊C + Ki＊D＊TsOpening Scheme # 2; EO = A + Kp ＊ C + Ki ＊ D ＊ Ts

개도식#2-1;EO=A + Kp'＊C + Ki'＊D＊Ts (Kp'< Kp , Ki'< Ki)Opening formula # 2-1; EO = A + Kp '＊ C + Ki' ＊ D ＊ Ts (Kp '<Kp, Ki' <Ki)

위의 각 식에 표기된 A, B, C, D는 여러가지 측정된 데이터 값을 나타내는 자료로, 이를 사용해 비례적분제어를 하게 된다. A, B, C, and D in the above equations are data representing various measured data values, and they are used for proportional integral control.

표에 나타난 것과 같이, 압축기 기동 초기와 그 이후로 나누어 각각 적용되는 전자 팽창 밸브의 개도식이 다른데, 특히 비례계수와 적분계수의 값이 초기보다 그 이후에 작게 적용되는 것을 알 수 있다. As shown in the table, the opening formulas of the electromagnetic expansion valves which are divided into the beginning and after of the compressor start are different. In particular, it can be seen that the values of the proportional coefficient and the integral coefficient are smaller after the initial stage.

따라서, 압축기 기동 초기에는 전자 팽창 밸브의 개도가 빠르게 제어되고, 그 이후에는 전자 팽창 밸브의 개도가 천천히 제어된다. Therefore, the opening degree of the electromagnetic expansion valve is controlled rapidly at the beginning of the compressor startup, and the opening degree of the electromagnetic expansion valve is then controlled slowly.

이와 같이, 본 발명은 압축기의 초기 기동(3분간) 및 안전 진입 후(3분 이후)로 나누어 전자 팽창 밸브의 개도를 제어함으로써, 시스템이 급변하는 상태에 맞게 전자 팽창 밸브의 개도가 조절된다. As described above, the present invention controls the opening degree of the electromagnetic expansion valve by dividing into the initial start of the compressor (3 minutes) and after the safe entry (after 3 minutes), so that the opening degree of the electromagnetic expansion valve is adjusted to match the rapidly changing state of the system.

이상 설명한 바와 같이, 인버터 에어컨의 전자 팽창 밸브의 제어를 압축기 초기 기동 및 안전 진입 후로 나누어 제어함으로써, 압축기의 신뢰성을 확보하여 시스템의 안정을 확보할 수 있다. As described above, the control of the electromagnetic expansion valve of the inverter air conditioner is controlled by dividing the compressor into the initial startup and the safe start after the compressor, thereby ensuring the reliability of the compressor and ensuring the stability of the system.

도 1은 종래 인버터 에어컨의 냉매 순환도1 is a refrigerant circulation diagram of a conventional inverter air conditioner

도 2는 본 발명에 의한 인버터 에어컨의 전자 팽창 밸브 제어 흐름도2 is a flow chart of the electronic expansion valve control of the inverter air conditioner according to the present invention

Claims (2)

에어컨의 전자 팽창 밸브 제어방법에 있어서, In the electronic expansion valve control method of the air conditioner, 압축기 기동 초기에는 전자 팽창 밸브의 개도를 빠르게 제어하고, 시스템이 안정된 후에는 전자 팽창 밸브의 개도를 천천히 제어하도록 전자 팽창 밸브 개도식을 구성하는 것을 특징으로 하는 에어컨의 전자 팽창 밸브 제어방법A method of controlling an electronic expansion valve of an air conditioner, the electronic expansion valve opening formula being configured to quickly control the opening degree of the electromagnetic expansion valve at the start of the compressor and slowly control the opening degree of the electromagnetic expansion valve after the system is stabilized. 제 1항에 있어서, The method of claim 1, 상기 전자 팽창 밸브 개도식은 계수값을 다르게 적용함으로써 조절되는데, 압축기 기동 초기의 계수값이 그 이후의 계수값보다 큰 것을 특징으로 하는 에어컨의 전자 팽창 밸브 제어방법The electronic expansion valve opening formula is controlled by applying a different coefficient value, the method of controlling the electromagnetic expansion valve of the air conditioner, characterized in that the coefficient value at the initial stage of the compressor start is larger than the coefficient value thereafter.
KR1020030054405A 2003-08-06 2003-08-06 Method of controlling electronic expansion valve for air-conditioner KR20050015541A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100735170B1 (en) * 2005-01-21 2007-07-03 엘지전자 주식회사 Driving control method of the linear expansion valve of a multi-type airconditioner
CN110542184A (en) * 2019-09-12 2019-12-06 广东美的制冷设备有限公司 Operation control method, operation control device, air conditioner, and storage medium
CN110966709A (en) * 2018-09-29 2020-04-07 青岛海尔空调器有限总公司 Method and device for determining initial opening degree of electronic expansion valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100735170B1 (en) * 2005-01-21 2007-07-03 엘지전자 주식회사 Driving control method of the linear expansion valve of a multi-type airconditioner
CN110966709A (en) * 2018-09-29 2020-04-07 青岛海尔空调器有限总公司 Method and device for determining initial opening degree of electronic expansion valve
CN110542184A (en) * 2019-09-12 2019-12-06 广东美的制冷设备有限公司 Operation control method, operation control device, air conditioner, and storage medium
CN110542184B (en) * 2019-09-12 2021-05-14 广东美的制冷设备有限公司 Operation control method, operation control device, air conditioner, and storage medium

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