US20080028779A1 - Method for controlling electronic expansion valve of air conditioner - Google Patents

Method for controlling electronic expansion valve of air conditioner Download PDF

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Publication number
US20080028779A1
US20080028779A1 US11/832,216 US83221607A US2008028779A1 US 20080028779 A1 US20080028779 A1 US 20080028779A1 US 83221607 A US83221607 A US 83221607A US 2008028779 A1 US2008028779 A1 US 2008028779A1
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United States
Prior art keywords
eev
pulse frequency
air conditioner
opening pulse
indoor
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Abandoned
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US11/832,216
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English (en)
Inventor
Kil Hong Song
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WiniaDaewoo Co Ltd
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Daewoo Electronics Co Ltd
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Assigned to DAEWOO ELECTRONICS CORPORATION reassignment DAEWOO ELECTRONICS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SONG, KIL HONG
Publication of US20080028779A1 publication Critical patent/US20080028779A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • F25B41/345—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by solenoids
    • F25B41/347—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by solenoids with the valve member being opened and closed cyclically, e.g. with pulse width modulation
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/06—Damage
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • 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
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • 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

Definitions

  • FIG. 1 a typical air conditioner has a structure illustrated in FIG. 1 .
  • the typical air conditioner is largely divided into an outdoor unit 110 and an indoor unit 120 .
  • the outdoor unit 110 includes a compressor 111 , a four-way valve 112 , an outdoor heat exchanger 113 , an electronic expansion valve (EEV) 114 , an accumulator 115 and an outdoor fan 116 .
  • the indoor unit 120 includes an indoor heat exchanger 121 and an indoor fan 123 .
  • a high-temperature and high-pressure gaseous refrigerant compressed in the compressor 111 is introduced, via the four-way valve 112 , into the outdoor heat exchanger 113 that functions as a condenser.
  • This high-pressure gaseous refrigerant undergoes heat exchange, through the outdoor heat exchanger 113 , with outdoor air, whose temperature is lower than the refrigerant temperature, to be condensed to a high pressure state.
  • the outdoor fan 116 is driven by an outdoor fan motor (not shown), and serves to forcibly ventilate the outdoor air.
  • the indoor fan 123 is driven by an indoor fan motor (not shown), and serves to forcibly ventilate the indoor air.
  • the refrigerant flow direction at the four-way valve 112 is reversed, so the refrigerant flows in an opposite direction from the refrigerant flow during the cooling operation set forth above.
  • the indoor heat exchanger 121 functions as a condenser differently from the cooling operation, warm air is circulated again into the indoor environment by the indoor fan 123 .
  • the refrigerant flow during the heating operation of the air conditioner follows the circulation line: for example, “the compressor 111 ⁇ the four-way valve 112 ⁇ the indoor heat exchanger 121 ⁇ the EEV 114 ⁇ the outdoor heat exchanger 113 ⁇ the four-way valve 112 ⁇ the accumulator 115 ⁇ the compressor 111 ”.
  • the EEV employed in the air conditioner with the refrigerant circulation line described above offers the functions of converting condensed liquid refrigerant introduced from the outdoor heat exchanger (condenser) into low-temperature and low-pressure liquid refrigerant by throttling, and then sending it to the indoor heat exchanger (evaporator); and adjusting an amount of refrigerant to be circulated.
  • a heating mode it provides the like functions of the cooling mode by circulating the refrigerant in the opposite direction of the cooling mode.
  • the air conditioner starts running with the EEV being closed. That is, an initial value of the opening level of the EEV is zero pulses/sec. Since the air conditioner starts running at the definite initial value of zero pulses/sec, convenience in control of the opening level of the EEV is secured.
  • One of conventional methods to control the opening level of EEV is to let the air conditioner to operate with the EEV being completely closed in the initial phase of a start-up, and then to change the opening level to a reference opening level (reference opening pulse frequency) that is calculated based on an indoor heat load.
  • a reference opening level reference opening pulse frequency
  • the EEV in the conventional method of controlling the start-up of the air conditioner in the state that the EEV is completely closed in the initial phase of the start-up, the EEV must be opened forcibly by using a separate jig at the time of refrigerant injection or for vacuum work in the production line, which not only complicates work processing but also increases the number of work processes to thereby lower productivity because.
  • a trip phenomenon is more likely to occur. That is, when the air conditioner stops momentarily due to a sudden power interruption and restarts its normal operation, sufficient torque of a compressor motor cannot be obtained because there is still a pressure difference, which causes a trip to the motor.
  • an object of the present invention to provide a method for controlling an EEV of an air conditioner, which opens the EEV completely at the same time as power is applied, closes the EEV completely in response to an operation start signal, and adaptively controls the opening level of the EEV based on a calculated reference opening pulse frequency (reference opening level).
  • an electronic expansion valve in an air conditioner using a compressor, the method including the steps of:
  • FIG. 1 shows an overall structural view of a typical air conditioner system
  • FIG. 2 illustrates a block diagram of an operation control device of an air conditioner suitable for applying thereto a method for controlling an EEV in the air conditioner in accordance with an embodiment of the present invention
  • FIG. 3 is a flowchart illustrating a procedure for adaptively controlling an opening level of the EEV in the air conditioner in accordance with the present invention.
  • FIG. 4 depicts a timing chart for explaining a procedure of gradually conducting a start-up control of the EEV in the air conditioner with the elapse of time in accordance with the present invention.
  • the present invention controls an opening level of the EEV in the air conditioner in a manner that an EEV of an air conditioner is completely open in response to power-on, completely closed when an operation start signal is inputted, and then controlled adaptively (i.e., in a stepwise manner or gradually) based on a reference opening pulse frequency (reference opening level) calculated on the basis of indoor heat load, etc.
  • a reference opening pulse frequency reference opening level
  • the indoor temperature sensor 202 is installed at, e.g., a specific position of an indoor unit 120 shown in FIG. 1 , to measure an indoor temperature. The measured indoor temperature is then forwarded to the control block 208 .
  • the outdoor temperature sensor 204 is installed at, e.g., a specific position of an outdoor unit 110 shown in FIG. 1 , to measure an outdoor temperature. The measured outdoor temperature is then delivered to the control block 208 .
  • the manipulation block 206 has a plurality of manipulation keys that are arranged for allowing a user to input various operation information such as power-on, operation mode (cooling operation mode, heating operation mode, etc.), target temperature, target air volume and the like.
  • operation information such as power-on, operation mode (cooling operation mode, heating operation mode, etc.), target temperature, target air volume and the like.
  • operation information received from the user is transferred to the control block 208 .
  • the control block 208 includes, e.g., a microprocessor and the like, to carry out the overall operation control of the air conditioner, and determines calibration coefficients for the indoor temperature, for the outdoor temperature and for a difference between the indoor temperature and the target temperature.
  • a microprocessor and the like to carry out the overall operation control of the air conditioner, and determines calibration coefficients for the indoor temperature, for the outdoor temperature and for a difference between the indoor temperature and the target temperature.
  • pre-stored in the form of tables are calibration coefficients for the indoor temperature, for the outdoor temperature and for a difference between the indoor temperature and the target temperature.
  • control block 208 calculates the indoor heat load based on a preset cooling capacity, a preset heating capacity, and each of the calibration coefficients determined; and then calculates a reference opening pulse frequency of the EEV in each mode (i.e., reference opening pulse frequencies in the cooling and the heating mode) based on the calculated indoor heat load, the indoor and the outdoor temperature, and a reference operating frequency of a compressor.
  • the control block 208 adaptively (in a stepwise manner or gradually) controls the opening level of the EEV on the basis of the calculated reference opening pulse frequency.
  • the cooling and the heating capacity are fixed values depending on the capacity of the indoor unit.
  • control block 208 completely opens the EEV having been closed at the same time as the power is applied, completely closes the EEV when an operation start signal is inputted by a user (or by an advance setting), and in a stepwise manner or gradually controls the opening level of the EEV based on the calculated reference opening pulse frequency. More details on this procedure will be provided with reference to FIG. 3 later.
  • control block 208 carries out its normal functions, i.e., selectively generating any of control signals for driving the indoor fan, the outdoor fan, the compressor and so forth, and providing the same to each corresponding component.
  • the EEV driving block 210 controls the opening level of the EEV 114 shown in FIG. 1 , in response to opening level control signals provided from the control block 208 . More concretely, the EEV driving block 210 completely opens the EEV 114 in response to an open control signal from the control block 208 when a power is turned on; completely closes the EEV 114 in response to a close control signal from the control block 208 when an operation start signal is inputted; and in a stepwise manner or gradually increases the opening level of the EEV up to the reference opening level under the control of the control block 208 .
  • FIG. 3 is a flowchart illustrating a method for adaptively controlling an opening level of an EEV in an air conditioner in accordance with the present invention.
  • step S 306 when a power-on signal is inputted by a user while an air conditioner is on a stand-by mode (stand-by power mode), item, if a power-on signal is inputted from the manipulation block 206 (steps S 302 and S 304 ), the control block 208 generates, in response to the power-on signal, an open control signal for completely opening the EEV 114 shown in FIG. 1 , and sends the generated open control signal to the EEV driving block 210 . In response to this, the EEV driving block 210 generates a driving signal for completely opening the EEV 114 to thereby completely open the EEV 114 (step S 306 ).
  • the control block 208 checks whether an operation start signal is inputted (step S 308 ) As a result of the checking, if the operation start signal is inputted, the control block 208 generates a close control signal for completely closing the EEV 114 and sends the generated close control signal to the EEV driving block 210 . In response to this, the EEV driving block 210 generates a driving signal for completely closing the EEV 114 , thereby fully closing the EEV 114 (step S 310 ). At this time, an opening pulse frequency of the EEV 114 is zero pulse/sec (initial value).
  • the indoor temperature sensor 202 measures an indoor temperature (indoor air temperature) T ai and provides it to the control block 208
  • the outdoor temperature sensor 204 measures an outdoor temperature (outdoor air temperature) T ao and offers it to the control block 208 (step S 312 ).
  • control block 208 determines calibration coefficients FT ai for the indoor temperature, FT ao for the outdoor temperature and FdT for a difference dT between the indoor temperature and a target temperature (user set temperature) with reference to tables of calibration coefficients pre-stored in the memory block 209 (step S 314 ).
  • each of the calibration coefficients is used for adjusting the reference opening level of the EEV 114 .
  • the memory block 209 stores calibration coefficients made in the form of table.
  • those calibration coefficients may be defined as shown in Tables 1 to 3.
  • Table 1 shows an example list of calibration coefficients for indoor temperatures in both cooling and heating operation modes
  • Table 2 represents an example list of calibration coefficients for outdoor temperatures in both cooling and heating operation modes
  • Table 3 depicts an example list of calibration coefficients for differences between the indoor temperatures and target temperatures in both cooling and heating operation modes.
  • control block 208 calculates indoor cooling/heating load Q by Equation 1 based on the preset cooling capacity Q c , the preset heating capacity Q h , the calibration coefficient FT ai for the indoor temperature, the calibration coefficient FT ao for the outdoor temperature, and the calibration coefficient FdT for the difference between the indoor temperature and the target temperature (step S 316 ).
  • the control block 208 calculates a reference opening pulse frequency P b,c of the EEV in a cooling mode and a reference opening pulse frequency P b,h of the EEV in a heating mode by using Equations 2 and 3, respectively, based on the indoor heat load Q obtained from Equation 1, a reference operating frequency F b of the compressor, the indoor temperature T ai , and the outdoor temperature T ao (step S 318 ).
  • the indoor and the outdoor temperature are required to be calculated in absolute temperatures. Or, errors may occur in substituting them to Equations 2 and 3 when they are sub-zero temperatures.
  • the opening pulse frequency of the EEV in the air conditioner approximately ranges from 70 pulses/sec to 280 pulses/sec. Therefore, during the operation of the air conditioner, the control block 208 calculates the reference opening pulse frequency of the EEV within the range from about 70 pulses/sec to 280 pulses/sec, and adjusts the opening level of the EEV based on the calculated reference opening pulse frequency.
  • the reference opening pulse frequency for adjusting the opening level of the EEV is calculated through the above-described procedure.
  • the control block 208 gradually controls or in a stepwise manner the opening level of the EEV by using the reference opening pulse frequency.
  • the opening level of the EEV can be controlled in a stepwise manner through a four-stage EEV opening pulse control (e.g., four stages having operating pulse frequencies of 0.7 ⁇ P b , 0.8 ⁇ P b , 0.9 ⁇ P b and 1.1 ⁇ P b , respectively, and each stage having a duration of one minute) until it reaches the reference opening pulse frequency P b (step S 320 ).
  • the procedure of the invention enters a steady state control after a start-up control of the EEV is performed in four minutes by increasing the opening pulse frequency at every one minute based on the reference opening pulse frequency.
  • the start-up control is carried out at a first start-up pulse frequency which is obtained by multiplying the reference opening pulse frequency by 0.7.
  • the start-up control is conducted at a second start-up pulse frequency which is obtained by multiplying the reference opening pulse frequency by 0.8.
  • the start-up control is performed at a third start-up pulse frequency which is obtained by multiplying the reference opening pulse frequency by 0.9.
  • the start-up control is carried out at a fourth start-up pulse frequency which is obtained by multiplying the reference opening pulse frequency by 1.1 (which is a higher opening pulse frequency pulse than the reference opening pulse frequency).
  • the reason for setting the opening pulse frequency of the EEV at the fourth stage to be higher than the reference opening pulse frequency P b is to prevent a rapid increase in a discharge pressure of the compressor in case the operating frequency of the compressor reaches its maximum level only after three minutes following the start-up of the compressor in overload or full load condition.
  • the EEV is completely open when only a power is turned on, and thus a repair technician can more easily connect a vacuum pump to inject refrigerant, thereby realizing quick after-sales service.
  • the EEV automatically opens to full extent to maintain pressure equilibrium. Therefore, a trip phenomenon that may occur due to insufficient torque of a compressor motor caused by difference in pressure can be effectively prevented.
  • the start-up of the EEV is controlled by changing in a stepwise manner the opening level of the EEV until it reaches the reference opening pulse frequency through four stages (e.g., 0.7 ⁇ P b , 0.8 ⁇ P b , 0.9 ⁇ P b and 1.1 ⁇ P b ), the embodiment is only for illustrative purposes, and the present invention is not limited thereto. If needed or depending on application, the opening level of the EEV may be classified into and controlled through more than four stages (e.g., five, six, seven, eight stages and so on), and it is apparent that the start-up operation of the EEV can be controlled even more smoothly through the use of the above scheme.
  • the opening level of the EEV may be classified into and controlled through more than four stages (e.g., five, six, seven, eight stages and so on), and it is apparent that the start-up operation of the EEV can be controlled even more smoothly through the use of the above scheme.
  • the air conditioner is driven evenly for one minute at each of the four stages of the opening level of the EEV, the embodiment is only for illustrative purposes, and the present invention is not limited thereto. It is apparent that the time period can be increased or decreased in consideration of various factors, such as, surrounding environment of the air conditioner. It is also noted that the running time of the air conditioner at each stage can be set differently whenever needed or depending on application.
  • calibration coefficients for an indoor temperature, for an outdoor temperature and for a difference in temperature are read out from the pre-stored tables
  • the embodiment is only for illustrative purposes, and the present invention is not limited thereto. It is apparent that the calibration coefficients may be calculated in real time mode, instead of being pre-stored in the tables.
  • the present invention controls an opening level of an EEV in an air conditioner in a manner that the EEV of the air conditioner is completely open in response to power-on, completely closed when an operation start signal is inputted and then controlled adaptively (in a stepwise manner or gradually) based on a reference opening pulse frequency (a reference opening level) calculated on the basis of indoor heat load, etc.
  • a simplified processing in manufacturing procedure associated with refrigerant injection and a quick after-sales service can be realized.
  • a trip phenomenon that may occur due to insufficient torque of a compressor motor caused by a difference in pressure in restart-up after stop can be effectively prevented.

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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)
US11/832,216 2006-08-04 2007-08-01 Method for controlling electronic expansion valve of air conditioner Abandoned US20080028779A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2006-0073556 2006-08-04
KR1020060073556A KR100785979B1 (ko) 2006-08-04 2006-08-04 공기 조화기의 전자 팽창 밸브 제어 방법

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US (1) US20080028779A1 (ko)
EP (1) EP2047185A1 (ko)
KR (1) KR100785979B1 (ko)
CN (1) CN101495824A (ko)
WO (1) WO2008016228A1 (ko)

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US20130227984A1 (en) * 2012-03-05 2013-09-05 Honda Motor Co., Ltd. Air conditioner for vehicle
US20140180483A1 (en) * 2012-12-20 2014-06-26 Automotive Research & Testing Center Intelligent thermostatic control method and device for an air conditioner blowing cold and hot air
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US20150247661A1 (en) * 2012-11-21 2015-09-03 Mitsubishi Electric Corporation Air-conditioning apparatus
US9140613B2 (en) 2012-03-16 2015-09-22 Zhejiang Dunan Hetian Metal Co., Ltd. Superheat sensor
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US20150362236A1 (en) * 2013-02-04 2015-12-17 Hangzhou Sanhua Research Institute Co., Ltd. Electronic expansion valve and control method thereof
US9261300B2 (en) 2012-11-12 2016-02-16 Trane International Inc. Expansion valve control system and method for air conditioning apparatus
US9702481B2 (en) 2009-08-17 2017-07-11 Dunan Microstaq, Inc. Pilot-operated spool valve
US9835360B2 (en) 2009-09-30 2017-12-05 Thermo Fisher Scientific (Asheville) Llc Refrigeration system having a variable speed compressor
JP2020093599A (ja) * 2018-12-11 2020-06-18 本田技研工業株式会社 空調装置
US11193704B2 (en) * 2017-08-03 2021-12-07 Gree Electric Appliances (Wuhan) Co., Ltd Heat pump reversing valve control based on the valve reversing pressure and the system pressure
US11655991B2 (en) * 2017-06-29 2023-05-23 Samsung Electronics Co., Ltd. Air conditioner and method of controlling air conditioner

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