WO2021190121A1 - Control method for air conditioner and air conditioner - Google Patents

Control method for air conditioner and air conditioner Download PDF

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Publication number
WO2021190121A1
WO2021190121A1 PCT/CN2021/073902 CN2021073902W WO2021190121A1 WO 2021190121 A1 WO2021190121 A1 WO 2021190121A1 CN 2021073902 W CN2021073902 W CN 2021073902W WO 2021190121 A1 WO2021190121 A1 WO 2021190121A1
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WIPO (PCT)
Prior art keywords
pressure ratio
compressor
speed
air conditioner
frequency
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PCT/CN2021/073902
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French (fr)
Chinese (zh)
Inventor
熊长友
孙超
刘守宇
刘德帅
杨坤
曹志高
Original Assignee
青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2021190121A1 publication Critical patent/WO2021190121A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis
    • 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
    • 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
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • 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
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • 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

  • the invention belongs to the technical field of air conditioning equipment, and in particular relates to an air conditioner control method, and an air conditioner adopting the control method.
  • a cut-off valve is provided in the split type air conditioner, and the cut-off valve is arranged on the pipeline connecting the indoor unit and the outdoor unit to close or open the refrigerant circuit. It also functions as a switch when evacuating or charging refrigerant.
  • the shut-off valve When the split air conditioner is powered on and used, especially when it is installed and used for the first time, the shut-off valve should be in the open state to ensure the normal flow of refrigerant between the indoor unit and the outdoor unit.
  • the air conditioner may be turned on directly without fully opening the valve. In this state, the operation mode of the air conditioner is abnormal, especially after a period of operation, the pressure of the entire refrigeration cycle will increase and exceed the safety threshold.
  • Some models with shutdown protection will frequently start, and in extreme cases, the refrigerant pipe may break from the pipe wall. Cause refrigerant leakage. The leaked refrigerant will explode when encountering electric sparks, causing serious safety accidents.
  • the present invention designs and provides a control method for the air conditioner, aiming at the situation that the air conditioner may be turned on directly without fully opening the valve due to the negligence of the installer, the failure of the shut-off valve itself, or the communication failure in the prior art.
  • An air conditioner control method includes the following steps: when the air conditioner is turned on, in a first set period: sampling the first high pressure detection value at the discharge end of the compressor; sampling the first low pressure detection value at the return end of the compressor; calculating the first Pressure ratio, the first pressure ratio is the ratio of the first high-pressure detection value to the first low-pressure detection value; in a second set period continuous with the first set period: sampling compressor discharge The second high pressure detection value of the gas end; the second low pressure detection value of the return gas end of the compressor; the second pressure ratio is calculated, and the second pressure ratio is the ratio of the second high pressure detection value to the second low pressure detection value ; Determine the compressor frequency change speed according to the first pressure ratio and the second pressure ratio, and control the compressor operation according to the compressor frequency change speed.
  • the method further includes the following steps: after obtaining the first pressure ratio, invoking the corresponding set compressor frequency change speed according to the first pressure ratio; after obtaining the second pressure ratio, according to the first pressure ratio
  • the second pressure ratio is to calibrate the frequency change speed of the set compressor to obtain the calibrated compressor frequency conversion speed; control the compressor to run at the calibrated compressor frequency conversion speed.
  • invoking the corresponding set compressor frequency change speed according to the first pressure ratio includes the following steps: if the first pressure ratio belongs to a first set pressure ratio interval, set the compressor frequency change speed to be the first A frequency increase speed; if the first pressure ratio belongs to the second set pressure ratio range, the compressor frequency change speed is set to the second frequency increase speed; if the first pressure ratio belongs to the third set pressure ratio Interval, the compressor frequency change speed is set as the third up-conversion speed; wherein, the first up-conversion speed is greater than the second up-conversion speed, and the second up-conversion speed is greater than or equal to the third up-conversion speed.
  • Frequency speed; the first set pressure ratio interval, the second set pressure ratio interval, and the third set pressure ratio interval are continuous and the upper limit threshold value increases sequentially.
  • calibrating the set compressor frequency change speed according to the second pressure ratio to obtain the calibrated compressor frequency conversion speed includes the following steps: if the second pressure ratio belongs to the first set pressure ratio interval, maintaining all The set compressor frequency change speed remains unchanged, the calibrated compressor frequency conversion speed is equal to the set compressor frequency change speed, and the compressor is controlled to run at an up-frequency operation; if the second pressure ratio belongs to the second set pressure ratio If the second pressure ratio belongs to the third set pressure ratio interval, the set compressor frequency change speed is calibrated to the set frequency reduction speed. , Control the compressor to run at reduced frequency.
  • calibrating the set compressor frequency change speed to the set frequency reduction speed includes the following steps: if in the first set period, the first pressure ratio belongs to the first set pressure ratio interval, then Calibrate the set compressor frequency change speed to the first set frequency reduction speed; if in the first set period, the first pressure ratio belongs to the second set pressure ratio interval, then the set The compressor frequency change speed is calibrated to the second set frequency reduction speed; if in the first set period, the first pressure ratio belongs to the third set pressure ratio interval, then the set compressor frequency change speed Calibration is the third set frequency reduction speed; wherein the absolute value of the first set frequency reduction speed is greater than the absolute value of the second set frequency reduction speed, and the absolute value of the second set frequency reduction speed It is greater than or equal to the absolute value of the third set frequency reduction speed.
  • the method further includes the following steps: after calculating the first pressure ratio, firstly determine whether the first pressure ratio belongs to the protection pressure ratio interval, and if the first pressure ratio belongs to the protection pressure ratio interval, control The compressor stops and stops calibrating the set compressor frequency change speed according to the second pressure ratio; wherein the protection pressure ratio interval is continuous with the third setting pressure ratio interval, and the protection pressure ratio interval is The lower limit threshold is greater than the upper limit threshold of the third set pressure ratio.
  • the method further includes the following steps: if the first pressure ratio belongs to the protection pressure ratio interval, further determining whether the second pressure ratio belongs to the first set pressure ratio interval; if the second pressure ratio belongs to the first set pressure ratio interval; Setting the pressure ratio interval, the compressor is controlled to stop while keeping the pressure relief valve closed; wherein, the first end of the pressure relief valve is connected to the first refrigerant passage, and the second end of the pressure relief valve is connected to the second refrigerant Medium passage; the first refrigerant passage is arranged between the indoor heat exchanger and the outdoor heat exchanger, the second refrigerant passage is arranged between the outdoor heat exchanger and the indoor heat exchanger, the first refrigeration A shut-off valve is provided on the medium passage and/or the second refrigerant passage.
  • the method further includes the following steps: after calculating the second pressure ratio, firstly determine whether the second pressure ratio belongs to the protection pressure ratio interval, and if the second pressure ratio belongs to the protection pressure ratio interval, control The compressor stops.
  • the method further includes the following steps: if the first pressure ratio and the second pressure ratio are both in the protection pressure ratio interval, control the compressor to stop and control the pressure relief valve to open; wherein, the pressure relief valve The first end is connected to a first refrigerant passage, and the second end of the pressure relief valve is connected to a second refrigerant passage.
  • the first refrigerant passage is arranged between the indoor heat exchanger and the outdoor heat exchanger.
  • the two refrigerant passages are arranged between the outdoor heat exchanger and the indoor heat exchanger, and the first refrigerant passage and/or the second refrigerant passage are provided with a shut-off valve.
  • Another aspect of the present invention provides an air conditioner that adopts the following control method: including the following steps: the air conditioner is turned on, in a first set period: sampling the first high pressure detection value at the exhaust end of the compressor; sampling the compressor return The first low-pressure detection value of the gas end; calculate the first pressure ratio, the first pressure ratio is the ratio of the first high-pressure detection value and the first low-pressure detection value; in continuous with the first set period
  • the second set period sample the second high pressure detection value at the discharge end of the compressor; sample the second low pressure detection value at the return end of the compressor; calculate the second pressure ratio, the second pressure ratio being the second high pressure detection
  • the compressor frequency change speed is determined according to the first pressure ratio and the second pressure ratio, and the compressor operation is controlled according to the compressor frequency change speed.
  • the present invention can accurately determine whether the current compressor working state is adapted to the system pressure ratio through two-period continuous monitoring, and determine the compressor frequency change speed in the next period according to the adapting state. Under the condition that the system pressure ratio is adapted, adjust the compressor frequency change speed with adjusting the air-conditioning room load as the primary goal; under the condition of the system pressure ratio not adapting, actively intervene to change the compressor frequency change speed to form a dynamic
  • the adjustment scheme ensures that even if the valve is not opened, the complex coupled air-conditioning system composed of multiple components and multiple heat exchange processes and affected by multiple external conditions remains stable and safe.
  • Fig. 1 is a flowchart of the first specific implementation of the air conditioner control method disclosed in the present invention
  • FIG. 2 is a flowchart of a second specific implementation of the air conditioner control method disclosed in the present invention.
  • Fig. 3 is a schematic structural diagram of an air conditioner applying the air conditioner control method provided by the present invention.
  • FIG. 1 is an internal structure diagram of an air conditioner applying the control method disclosed in the present invention.
  • This air conditioner 1 includes an indoor heat exchanger 10, an outdoor heat exchanger 11, a compressor 12, a throttling device 14, and a four-way valve 13 for switching the refrigerant flow direction according to different air conditioning modes.
  • the operating frequency of the compressor 12 can be continuously changed according to the change of the indoor air-conditioning load.
  • the refrigerant path between the indoor heat exchanger 10 and the outdoor heat exchanger 11 is defined as the first refrigerant path
  • the refrigerant path between the outdoor heat exchanger 11 and the indoor heat exchanger 10 is defined as the first refrigerant path.
  • Two refrigerant passages Two refrigerant passages.
  • the shut-off valve that functions to close or open the refrigerant circuit can be arranged on the first refrigerant passage, or on the second refrigerant passage, or as shown in FIG. 3, in the first refrigerant passage and the second refrigerant passage.
  • An independently working stop valve (17, 18) is respectively arranged on the agent passage.
  • a pressure relief valve EEV19 is also provided in the refrigerant cycle. The first end of the pressure relief valve EEV19 is connected to the first refrigerant pipeline, and the second end of the pressure relief valve EEV19 is connected to the second refrigerant pipeline.
  • the pressure relief valve EEV19 is preferably a solenoid valve, which can receive the electrical signal output by the controller of the air conditioner 1 to switch between the closed state and the open state under the control of the air conditioner 1 controller to reduce the refrigerant in the refrigerant pipeline.
  • Instantaneous pressure A first pressure sensor 15 is provided at the discharge end of the compressor 12 to detect the discharge pressure at the discharge end, and a second pressure sensor 16 is provided at the return air end of the compressor 12 to detect the return air pressure at the return air end.
  • the air conditioner control method disclosed in this embodiment includes the following steps:
  • the air conditioner is turned on, and in the first set period, the pressure detection value of the first pressure sensor at the discharge end of the compressor is sampled and recorded as the first high pressure detection value.
  • the pressure detection value of the second pressure sensor at the return air end of the sampling compressor is recorded as the first low pressure detection value.
  • the first pressure ratio is calculated, and the first pressure ratio is the ratio of the first high-pressure detection value to the first low-pressure detection value.
  • the pressure detection value of the first pressure sensor at the discharge end of the compressor is sampled again and recorded as the second high pressure detection value.
  • Sampling again the pressure detection value of the second pressure sensor at the return end of the compressor is recorded as the second low pressure detection value.
  • the second pressure ratio is calculated, and the second pressure ratio is the ratio of the second high pressure detection value to the second low pressure detection value.
  • the compressor frequency change speed is determined according to the first pressure ratio and the second pressure ratio, and the compressor operation is controlled according to the compressor frequency change speed.
  • the duration of the first set period and the second set period are preferably selected according to the air conditioning capability, and the duration of the first set period and the second set period are preferably set to be the same, so as to be fully reflected in the two consecutive settings.
  • the adjustment scheme ensures that the complex coupled air-conditioning system composed of multiple components and multiple heat exchange processes and affected by multiple external conditions remains stable and safe.
  • the specific method shown in Fig. 2 can be used to control the operation of the compressor according to the change speed of the compressor frequency. It is easy to understand that after the air conditioner is turned on, if the temperature difference between the current air-conditioned room ambient temperature and the user's set temperature is large, the indoor air-conditioning load is large, and the compressor speed needs to rise quickly; if the current air-conditioned room ambient temperature and the user’s If the temperature difference between the set temperatures is small, the indoor air-conditioning load is small, and the compressor speed needs to rise slowly.
  • the rising speed of rapid frequency rise and slow frequency rise is usually a fixed value. For example, the frequency change is set to 2Hz/s for fast rise, 1Hz/2s for slow rise, etc.
  • the specific value of the speed is not limited here. .
  • the same control strategy is preferably maintained, and the pressure detection value sampling in the first set period is started at the same time when the operation is started according to the temperature difference. After the first pressure ratio is sampled, it starts to intervene in the speed of the compressor frequency change according to the system pressure ratio.
  • the air-conditioning controller stores a one-to-one correspondence between the pressure ratio setting interval and the set compressor frequency change speed.
  • This one-to-one correspondence follows the following law, that is, the smaller the upper threshold of the pressure ratio setting interval, that is, the smaller the system pressure ratio, the allowable set compressor frequency change speed, especially the higher the compressor frequency up-frequency speed. .
  • An optional way is to set three set pressure ratio intervals, if the first pressure ratio belongs to the first set pressure ratio interval, set the compressor frequency change speed to the first up-frequency speed; if the first pressure ratio If the ratio belongs to the second set pressure ratio interval, the compressor frequency change speed is set to the second up-conversion speed; if the first pressure ratio belongs to the third set pressure ratio interval, the compressor frequency change speed is set to the third Upscaling speed.
  • the first up-conversion speed is greater than the second up-conversion speed
  • the second up-conversion speed is greater than or equal to the third up-conversion speed.
  • the first up-frequency speed can be set to 2Hz/s
  • the second up-frequency speed can be set to 1Hz/s
  • the third up-frequency speed can be set to 1Hz/2s. It is also possible to set both the second up-conversion speed and the third up-conversion speed to 1Hz/2s.
  • the first set pressure ratio interval, the second set pressure ratio interval, and the third set pressure ratio interval are continuous and the upper limit threshold value increases sequentially. For example, you can set the first set pressure ratio interval to [1,3], the second set pressure ratio interval to (3,6], and the third set pressure ratio interval to (6,9).
  • the air conditioner When the system is turned on by default, the air conditioner is operating normally, and the compressor frequency needs to keep rising to eliminate the temperature difference between the air-conditioning room temperature and the set temperature.
  • the system does not immediately intervene. As shown in Figure 2, the system keeps sampling the pressure of the first pressure sensor and the second pressure sensor, and calculates the second pressure ratio. After the second pressure ratio is obtained, the second pressure ratio
  • the calibration sets the compressor frequency change speed to obtain the calibrated compressor frequency conversion speed.
  • the compressor is controlled to run at the calibrated compressor frequency conversion speed.
  • the frequency change speed of the compressor is calibrated and set according to the second pressure ratio, and obtaining the calibrated frequency conversion speed of the compressor specifically includes the following steps:
  • the second pressure ratio belongs to the first set pressure ratio range, it means that the system pressure ratio remains at a low level after a period of startup operation, the working state is stable, and the risk of safety accidents is small, that is, the set compressor frequency is maintained
  • the change speed remains the same, that is, the calibrated compressor frequency conversion speed obtained in this step is equal to the set compressor frequency change speed, and the compressor is controlled to continue up-frequency operation according to the established control strategy to meet the needs of adjusting the load of the air-conditioned room.
  • the second pressure ratio belongs to the second set pressure ratio range, it means that the system pressure ratio is stable and maintained at a reasonable level after a period of start-up operation. If the frequency continues to increase, the system pressure ratio may be too high, that is, Control the compressor to no longer run at up-frequency, that is, the calibrated compressor frequency conversion speed obtained in this step is equal to 0, the compressor frequency no longer increases, and the compressor is controlled to keep the current operating frequency unchanged and run at a fixed frequency to avoid system pressure ratios. Continue to rise.
  • the second pressure ratio belongs to the third set pressure ratio range, it means that the system pressure ratio is at a relatively high level after the start-up operation for a period of time, and the valve may not be opened. That is, the compressor frequency change speed is set to be calibrated Frequency reduction speed, control the compressor to reduce frequency operation to reduce the system pressure ratio.
  • the frequency reduction speed is determined according to the increase in the system pressure ratio:
  • the first pressure ratio belongs to the first set pressure ratio interval
  • the second pressure ratio belongs to the third set pressure ratio interval
  • the compressor frequency change speed will be set, that is, the first up-frequency speed will be calibrated to the first set down-frequency speed, that is, the up-frequency operation will not be performed at the end of the second set period Instead, it performs fast frequency reduction operation, sacrificing the demand for air-conditioning, and prioritizing system safety.
  • the first pressure ratio belongs to the second set pressure ratio interval, and if it is further obtained that the second pressure ratio belongs to the third set pressure ratio interval, it means that the system pressure ratio is larger when it is just started. , And the system pressure ratio does not increase drastically, the compressor frequency change speed is set, that is, the second up-frequency speed is calibrated to the second set down-frequency speed, that is, the up-frequency is not executed at the end of the second set period Instead, it performs slow frequency reduction operation to give priority to system safety, while taking into account the needs of air-conditioning.
  • the first pressure ratio belongs to the third set pressure ratio interval, and if it is further obtained that the second pressure ratio belongs to the third set pressure ratio interval, it means that the system pressure
  • the ratio does not increase significantly but maintains a stable high pressure ratio operating condition, and the set compressor frequency change speed, that is, the third up-frequency speed is calibrated to the third set down-frequency speed, that is, in the second set period
  • the frequency-up operation is not performed, but a slow frequency-down operation is performed to give priority to the safety of the system, and at the same time, the air-conditioning needs are still taken into account under the state of high pressure ratio.
  • the absolute value of the first set frequency reduction speed is greater than the absolute value of the second set frequency reduction speed, and the absolute value of the second set frequency reduction speed is greater than or equal to the absolute value of the third set frequency reduction speed.
  • the first set frequency reduction speed can be set to -2Hz/s
  • the second set frequency reduction speed can be set to -1Hz/s
  • the third set frequency reduction speed can be set to -1Hz/2s. It is also possible to set both the second set frequency reduction speed and the third set frequency reduction speed to -1Hz/2s.
  • the pre-intervention of the compressor frequency change speed to avoid the risky operating conditions.
  • the compressor is directly controlled to stop and stop setting the compressor frequency change speed according to the second pressure ratio calibration.
  • the protection pressure ratio interval is continuous with the third set pressure ratio interval, and the lower limit threshold value of the protection pressure ratio interval is greater than the upper limit threshold value of the third set pressure ratio.
  • the lower limit threshold of the protection pressure ratio interval can be set to be greater than 9.
  • the system While stopping to calibrate and set the compressor frequency change speed according to the second pressure ratio, the system still maintains the monitoring of the second pressure ratio. If the second pressure ratio belongs to the first set pressure ratio range, it means that the compressor stops significantly. In order to improve the system pressure ratio, no hardware intervention is required to control the compressor to stop while keeping the pressure relief valve EEV closed. In this way, if a drastic load change causes the first pressure ratio to exceed the lower limit threshold of the protection setting pressure ratio setting interval for a short time, while intervening in time, it can also ensure that the air conditioner can maintain normal continuous under load elimination conditions when the air conditioner is turned on again. Running status, no additional waiting time is required. If the second pressure ratio does not belong to the first set pressure ratio interval, the compressor is controlled to stop while the pressure relief valve EEV is controlled to open, and the pressure relief valve EEV is used to adjust the system pressure ratio.
  • the second pressure ratio it is first determined whether the second pressure ratio belongs to the protection pressure ratio interval. If the second pressure ratio belongs to the protection pressure ratio range, the compressor is controlled to stop. If the first pressure ratio and the second pressure ratio are both in the protection pressure ratio range, the compressor is controlled to stop while the pressure relief valve EEV is controlled to open, and the pressure relief valve EEV is used to adjust the system pressure ratio.
  • K1 represents the first pressure ratio
  • K2 represents the second pressure ratio
  • the first up- conversion speed V up1 is greater than the second up- conversion speed V up2
  • the second up- conversion speed V up2 is greater than or equal to the third up-conversion speed
  • the first set frequency-down speed V down1 is greater than the second set frequency-down speed V down2
  • the second set frequency reduction speed V down2 is greater than or equal to the third set frequency reduction speed V down3 .
  • the system pressure ratio in two consecutive sampling periods, if the system pressure ratio is in a lower range, the system keeps the frequency up; if the system pressure ratio is in a reasonable range, the system keeps the frequency unchanged, and If the system pressure ratio is in a higher range, the system keeps frequency reduction. Therefore, while ensuring the reasonable operation of the air conditioner, the risk of the system is controlled at a reasonable level. For example, when the system pressure is relatively high, the compressor will not continue to operate at high frequency, making the operation of the air conditioner safer.
  • the unopened valve state is a failure of the air conditioner.
  • the frequency is relatively low. Therefore, for ordinary split air conditioners, the control system is to reduce and eliminate the temperature difference between the ambient temperature of the air-conditioned room and the user set temperature.
  • the control target is used to control the operating frequency of the compressor.
  • This control strategy has the highest priority.
  • the pressure ratio is sampled according to the set sampling period. If the pressure ratio falls within the protection pressure ratio range, the compressor shutdown protection is performed first. And then switch to determine the compressor frequency change speed according to the control method described in the above embodiment, and control the compressor operation according to the compressor frequency change speed.
  • the embodiment of the present application also provides an air conditioner, which applies the above-mentioned air conditioner control method.
  • air conditioner control method For specific steps of the air conditioner control method, refer to the detailed description of the above-mentioned embodiment and the detailed description of the accompanying drawings in the specification. It will not be repeated here, and the air conditioner adopting the above air conditioner control method can achieve the same technical effect.
  • An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium is stored in a computer program for electronic data exchange, and the computer program causes the air conditioner to perform part or all of the steps of any method described in the above method embodiment.
  • the disclosed device may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the above-mentioned units or modules is only a logical function division.
  • there may be other division methods for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical or other forms.
  • the units described above as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one physical space, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

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Abstract

An air conditioner and a control method for the air conditioner. The control method comprises: the air conditioner starts up; within a first configuration cycle, sample a first high voltage measurement value of an air discharge end of a compressor, and sample a first low voltage measurement value of an air return end of the compressor; calculate a first pressure ratio; within a second configuration cycle in succession to the first configuration cycle, sample a second high voltage measurement value of the air discharge end of the compressor, and sample a second low voltage measurement value of the air return end of the compressor; calculate a second pressure ratio; and determine a compressor frequency change speed according to the first pressure ratio and the second pressure ratio, and control operation of the compressor according to the compressor frequency change speed. By means of continuous monitoring for two cycles, whether the current working state of the compressor adapts to a system pressure ratio can be accurately determined, and the compressor frequency change speed in the next cycle is determined according to an adaption state, thereby ensuring that an air conditioner system can remain stable and safe even if there is no open valve.

Description

空调器控制方法和空调器Air conditioner control method and air conditioner 技术领域Technical field
本发明属于空气调节设备技术领域，尤其涉及一种空调器控制方法，以及一种采用此种控制方法的空调器。The invention belongs to the technical field of air conditioning equipment, and in particular relates to an air conditioner control method, and an air conditioner adopting the control method.
背景技术Background technique
在分体式空调器中设置有截止阀，截止阀设置在连接室内机和室外机的管路上，起到关闭或开启制冷剂回路的作用。在抽真空或者充注制冷剂时，也起到开关作用。A cut-off valve is provided in the split type air conditioner, and the cut-off valve is arranged on the pipeline connecting the indoor unit and the outdoor unit to close or open the refrigerant circuit. It also functions as a switch when evacuating or charging refrigerant.
分体式空调器在上电开机使用，尤其首次安装使用时，截止阀应该处于开阀状态，以确保室内机和室外机之间的制冷剂正常流动。但是由于安装人员的疏忽、截止阀本身的故障或者通信故障，可能会出现空调器在未完全开阀的条件下直接开机的情况。在这种状态下，空调器的运行模式是不正常的，尤其是在运行一段时间后，整个制冷循环的压力会增大并超过安全阈值。部分具有停机保护的机型会出现频繁启动的情况，在极端情况下，还可能出现制冷剂管路从管壁处破裂的情况。导致制冷剂泄漏。泄漏的制冷剂遇到电火花会发生***，造成严重的安全事故。When the split air conditioner is powered on and used, especially when it is installed and used for the first time, the shut-off valve should be in the open state to ensure the normal flow of refrigerant between the indoor unit and the outdoor unit. However, due to the negligence of the installer, the failure of the shut-off valve itself, or the communication failure, the air conditioner may be turned on directly without fully opening the valve. In this state, the operation mode of the air conditioner is abnormal, especially after a period of operation, the pressure of the entire refrigeration cycle will increase and exceed the safety threshold. Some models with shutdown protection will frequently start, and in extreme cases, the refrigerant pipe may break from the pipe wall. Cause refrigerant leakage. The leaked refrigerant will explode when encountering electric sparks, causing serious safety accidents.
本背景技术所公开的上述信息仅仅用于增加对本申请背景技术的理解，因此，其可能包括不构成本领域普通技术人员已知的现有技术。The above-mentioned information disclosed in the background art is only used to increase the understanding of the background art of the present application, and therefore, it may include the prior art that does not constitute the prior art known to those of ordinary skill in the art.
发明内容Summary of the invention
本发明针对现有技术中由于安装人员的疏忽、截止阀本身的故障或者通信故障，可能会出现空调器在未完全开阀的条件下直接开机的情况，设计并提供一种空调器控制方法。The present invention designs and provides a control method for the air conditioner, aiming at the situation that the air conditioner may be turned on directly without fully opening the valve due to the negligence of the installer, the failure of the shut-off valve itself, or the communication failure in the prior art.
为实现上述发明目的，本发明采用下述技术方案予以实现：In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions to achieve:
一种空调器控制方法，包括以下步骤:空调器开机，在第一设定周期内：采样压缩机排气端的第一高压检测值；采样压缩机回气端的第一低压检测值；计算第一压力比，所述第一压力比为所述第一高压检测值和所述第一低压检测值的比值；在与所述第一设定周期连续的第二设定周期内：采样压缩机排气端的第二高压检测值；采样压缩机回气端的第二低压检测值；计算第二压力比，所述第二压力比为所述第二高压检测值和所述第二低压检测值的比值；根据所述第一压力比和第二压力比确定压缩机频率变化速度，并按照所述压缩机频率变化速度控制压缩机运行。An air conditioner control method includes the following steps: when the air conditioner is turned on, in a first set period: sampling the first high pressure detection value at the discharge end of the compressor; sampling the first low pressure detection value at the return end of the compressor; calculating the first Pressure ratio, the first pressure ratio is the ratio of the first high-pressure detection value to the first low-pressure detection value; in a second set period continuous with the first set period: sampling compressor discharge The second high pressure detection value of the gas end; the second low pressure detection value of the return gas end of the compressor; the second pressure ratio is calculated, and the second pressure ratio is the ratio of the second high pressure detection value to the second low pressure detection value ; Determine the compressor frequency change speed according to the first pressure ratio and the second pressure ratio, and control the compressor operation according to the compressor frequency change speed.
进一步的，还包括以下步骤：在得到所述第一压力比后，根据所述第一压力比调用对应的设定压缩机频率变化速度；在得到所述第二压力比后，根据所述第二压力比校准所述设定压缩机频率变化速度，得到校准压缩机变频速度；控制压缩机按照所述校准压缩机变频速度运行。Further, the method further includes the following steps: after obtaining the first pressure ratio, invoking the corresponding set compressor frequency change speed according to the first pressure ratio; after obtaining the second pressure ratio, according to the first pressure ratio The second pressure ratio is to calibrate the frequency change speed of the set compressor to obtain the calibrated compressor frequency conversion speed; control the compressor to run at the calibrated compressor frequency conversion speed.
进一步的，根据所述第一压力比调用对应的设定压缩机频率变化速度包括以下步骤：如果所述第一压力比属于第一设定压力比区间，则设定压缩机频率变化速度为第一升频速度；如果所述第一压力比属于第二设定压力比区间，则设定压缩机频率变化速度为第二升频速度；如果所述第一压力比属于第三设定压力比区间，则设定压缩机频率变化速度为第三升频速度；其中，所述第一升频速度大于所述第二升频速度，所述第二升频速度大于或等于所述第三升频速度；所述第一设定压力比区间、第二设定压力比区间和第三设定压力比区间连续且上限阈值依次递增。Further, invoking the corresponding set compressor frequency change speed according to the first pressure ratio includes the following steps: if the first pressure ratio belongs to a first set pressure ratio interval, set the compressor frequency change speed to be the first A frequency increase speed; if the first pressure ratio belongs to the second set pressure ratio range, the compressor frequency change speed is set to the second frequency increase speed; if the first pressure ratio belongs to the third set pressure ratio Interval, the compressor frequency change speed is set as the third up-conversion speed; wherein, the first up-conversion speed is greater than the second up-conversion speed, and the second up-conversion speed is greater than or equal to the third up-conversion speed. Frequency speed; the first set pressure ratio interval, the second set pressure ratio interval, and the third set pressure ratio interval are continuous and the upper limit threshold value increases sequentially.
进一步的，根据所述第二压力比校准所述设定压缩机频率变化速度，得到校准压缩机变频速度包括以下步骤：如果所述第二压力比属于第一设定压力比区间，则保持所述设定压缩机频率变化速度不变，所述校准压缩机变频速度等于所述设定压缩机频率变化速度，控制压缩机升频运行；如果所述第二压力比属于第二设定压力比区间，则控制压缩机保持当前运行频率不变定频运行；如 果所述第二压力比属于第三设定压力比区间，则将所述设定压缩机频率变化速度校准为设定降频速度，控制压缩机降频运行。Further, calibrating the set compressor frequency change speed according to the second pressure ratio to obtain the calibrated compressor frequency conversion speed includes the following steps: if the second pressure ratio belongs to the first set pressure ratio interval, maintaining all The set compressor frequency change speed remains unchanged, the calibrated compressor frequency conversion speed is equal to the set compressor frequency change speed, and the compressor is controlled to run at an up-frequency operation; if the second pressure ratio belongs to the second set pressure ratio If the second pressure ratio belongs to the third set pressure ratio interval, the set compressor frequency change speed is calibrated to the set frequency reduction speed. , Control the compressor to run at reduced frequency.
进一步的，将所述设定压缩机频率变化速度校准为设定降频速度时包括以下步骤：如果在第一设定周期内，所述第一压力比属于第一设定压力比区间，则将所述设定压缩机频率变化速度校准为第一设定降频速度；如果在第一设定周期内，所述第一压力比属于第二设定压力比区间，则将所述设定压缩机频率变化速度校准为第二设定降频速度；如果在第一设定周期内，所述第一压力比属于第三设定压力比区间，则将所述设定压缩机频率变化速度校准为第三设定降频速度；其中，所述第一设定降频速度的绝对值大于所述第二设定降频速度的绝对值，所述第二设定降频速度的绝对值大于等于所述第三设定降频速度的绝对值。Further, calibrating the set compressor frequency change speed to the set frequency reduction speed includes the following steps: if in the first set period, the first pressure ratio belongs to the first set pressure ratio interval, then Calibrate the set compressor frequency change speed to the first set frequency reduction speed; if in the first set period, the first pressure ratio belongs to the second set pressure ratio interval, then the set The compressor frequency change speed is calibrated to the second set frequency reduction speed; if in the first set period, the first pressure ratio belongs to the third set pressure ratio interval, then the set compressor frequency change speed Calibration is the third set frequency reduction speed; wherein the absolute value of the first set frequency reduction speed is greater than the absolute value of the second set frequency reduction speed, and the absolute value of the second set frequency reduction speed It is greater than or equal to the absolute value of the third set frequency reduction speed.
进一步的，还包括以下步骤：计算出所述第一压力比后，首先判定所述第一压力比是否属于保护压力比区间，如果所述第一压力比属于所述保护压力比区间，则控制压缩机停机并停止根据所述第二压力比校准所述设定压缩机频率变化速度；其中所述保护压力比区间与所述第三设定压力比区间连续，且所述保护压力比区间的下限阈值大于所述第三设定压力比的上限阈值。Further, the method further includes the following steps: after calculating the first pressure ratio, firstly determine whether the first pressure ratio belongs to the protection pressure ratio interval, and if the first pressure ratio belongs to the protection pressure ratio interval, control The compressor stops and stops calibrating the set compressor frequency change speed according to the second pressure ratio; wherein the protection pressure ratio interval is continuous with the third setting pressure ratio interval, and the protection pressure ratio interval is The lower limit threshold is greater than the upper limit threshold of the third set pressure ratio.
进一步的，还包括以下步骤：如果所述第一压力比属于保护压力比区间，则进一步判定所述第二压力比是否属于第一设定压力比区间；如果所述第二压力比属于第一设定压力比区间，则控制压缩机停机的同时保持泄压阀关闭；其中，所述泄压阀的第一端连通第一制冷剂通路，所述泄压阀的第二端连通第二制冷剂通路；所述第一制冷剂通路设置在室内换热器和室外换热器之间，所述第二制冷剂通路设置在室外换热器和室内换热器之间，所述第一制冷剂通路和/或第二制冷剂通路上设置有截止阀。Further, the method further includes the following steps: if the first pressure ratio belongs to the protection pressure ratio interval, further determining whether the second pressure ratio belongs to the first set pressure ratio interval; if the second pressure ratio belongs to the first set pressure ratio interval; Setting the pressure ratio interval, the compressor is controlled to stop while keeping the pressure relief valve closed; wherein, the first end of the pressure relief valve is connected to the first refrigerant passage, and the second end of the pressure relief valve is connected to the second refrigerant Medium passage; the first refrigerant passage is arranged between the indoor heat exchanger and the outdoor heat exchanger, the second refrigerant passage is arranged between the outdoor heat exchanger and the indoor heat exchanger, the first refrigeration A shut-off valve is provided on the medium passage and/or the second refrigerant passage.
进一步的，还包括以下步骤：计算出所述第二压力比后，首先判定所述第二压力比是否属于保护压力比区间，如果所述第二压力比属于所述保护压力比区间，则控制压缩机停机。Further, the method further includes the following steps: after calculating the second pressure ratio, firstly determine whether the second pressure ratio belongs to the protection pressure ratio interval, and if the second pressure ratio belongs to the protection pressure ratio interval, control The compressor stops.
进一步的，还包括以下步骤：如果所述第一压力比和第二压力比均处于所述保护压力比区间，则控制压缩机停机并控制泄压阀开阀；其中，所述泄压阀的第一端连通第一制冷剂通路，所述泄压阀的第二端连通第二制冷剂通路，所述第一制冷剂通路设置在室内换热器和室外换热器之间，所述第二制冷剂通路设置在室外换热器和室内换热器之间，所述第一制冷剂通路和/或第二制冷剂通路上设置有截止阀。Further, the method further includes the following steps: if the first pressure ratio and the second pressure ratio are both in the protection pressure ratio interval, control the compressor to stop and control the pressure relief valve to open; wherein, the pressure relief valve The first end is connected to a first refrigerant passage, and the second end of the pressure relief valve is connected to a second refrigerant passage. The first refrigerant passage is arranged between the indoor heat exchanger and the outdoor heat exchanger. The two refrigerant passages are arranged between the outdoor heat exchanger and the indoor heat exchanger, and the first refrigerant passage and/or the second refrigerant passage are provided with a shut-off valve.
本发明的另一个方面提供一种空调器，采用以下的控制方法：包括以下步骤:空调器开机，在第一设定周期内：采样压缩机排气端的第一高压检测值；采样压缩机回气端的第一低压检测值；计算第一压力比，所述第一压力比为所述第一高压检测值和所述第一低压检测值的比值；在与所述第一设定周期连续的第二设定周期内：采样压缩机排气端的第二高压检测值；采样压缩机回气端的第二低压检测值；计算第二压力比，所述第二压力比为所述第二高压检测值和所述第二低压检测值的比值；根据所述第一压力比和第二压力比确定压缩机频率变化速度，并按照所述压缩机频率变化速度控制压缩机运行。Another aspect of the present invention provides an air conditioner that adopts the following control method: including the following steps: the air conditioner is turned on, in a first set period: sampling the first high pressure detection value at the exhaust end of the compressor; sampling the compressor return The first low-pressure detection value of the gas end; calculate the first pressure ratio, the first pressure ratio is the ratio of the first high-pressure detection value and the first low-pressure detection value; in continuous with the first set period In the second set period: sample the second high pressure detection value at the discharge end of the compressor; sample the second low pressure detection value at the return end of the compressor; calculate the second pressure ratio, the second pressure ratio being the second high pressure detection The ratio of the second low pressure detection value to the second low pressure detection value; the compressor frequency change speed is determined according to the first pressure ratio and the second pressure ratio, and the compressor operation is controlled according to the compressor frequency change speed.
与现有技术相比，本发明的优点和积极效果是：Compared with the prior art, the advantages and positive effects of the present invention are:
本发明通过两个周期的连续监测，即可以准确判定当前压缩机工作状态是否与***压力比适配，并根据适配状态确定下一个周期内的压缩机频率变化速度。在***压力比适配的条件下，适当以调节空调房间负荷为首要目标调节压缩机频率变化速度；在***压力比不适配的条件下，主动干预，改变压缩机频率变化速度，形成动态的调节方案，确保即使存在未开阀的情况，由多个部件、多个换热过程组成且受到多种外部条件影响的复杂耦合空调***保持稳定安全。The present invention can accurately determine whether the current compressor working state is adapted to the system pressure ratio through two-period continuous monitoring, and determine the compressor frequency change speed in the next period according to the adapting state. Under the condition that the system pressure ratio is adapted, adjust the compressor frequency change speed with adjusting the air-conditioning room load as the primary goal; under the condition of the system pressure ratio not adapting, actively intervene to change the compressor frequency change speed to form a dynamic The adjustment scheme ensures that even if the valve is not opened, the complex coupled air-conditioning system composed of multiple components and multiple heat exchange processes and affected by multiple external conditions remains stable and safe.
结合附图阅读本发明的具体实施方式后，本发明的其他特点和优点将变得更加清楚。After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer.
附图说明Description of the drawings
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要 使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained from these drawings.
图1为本发明所公开的空调器控制方法第一种具体实施方式的流程图；Fig. 1 is a flowchart of the first specific implementation of the air conditioner control method disclosed in the present invention;
图2为本发明所公开的空调器控制方法第二种具体实施方式的流程图；Figure 2 is a flowchart of a second specific implementation of the air conditioner control method disclosed in the present invention;
图3为应用本发明所提供的空调器控制方法的空调器的结构示意图。Fig. 3 is a schematic structural diagram of an air conditioner applying the air conditioner control method provided by the present invention.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白，以下将结合附图和实施例，对本发明作进一步详细说明。In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the present invention in detail with reference to the accompanying drawings and embodiments.
本发明的说明书和权利要求书及所述附图中的术语“第一”、“第二”、“第三”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们的任何变形，代表覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、***、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。The terms "first", "second", "third", etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific sequence. In addition, the terms "including" and "having" and any variations of them represent non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment.
在本发明中“实施例”代表结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中，各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员可以理解，本文所描述的实施例可以与其它实施例相结合。In the present invention, "embodiment" means that a specific feature, structure, or characteristic described in conjunction with the embodiment can be included in at least one embodiment of the present application. In the specification, the appearance of the phrase in various positions does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art can understand that the embodiments described herein can be combined with other embodiments.
针对由于安装人员的疏忽、截止阀本身的故障或者通信故障，可能会出现空调器在未完全开阀的条件下直接开机的情况，一种全新设计的空调器控制方法的具体控制流程如图1所示。这种空调器控制方法在兼顾用户空调使用需求的同时，对空调器进行保护，确保***和压缩机等主要部件不发生损坏。采用这种控制方法，可以完全杜绝由于未开阀导致的制冷剂管路破裂，制冷剂泄漏的安全事故。图3为一种应用本发明所公开的控制方法的空调器的内部结构图。这种空调器1中包括室内换热器10、室外换热器11、压缩机12、节流装置14 以及用于根据不同空调模式切换制冷剂流动方向的四通阀13。其中，压缩机12的运行频率可以根据室内空调负荷的变化而连续变化。为了便于描述，定义室内换热器10和室外换热器11之间的制冷剂通路为第一制冷剂通路，定义室外换热器11和室内换热器10之间的制冷剂通路形为第二制冷剂通路。起到关闭或开启制冷剂回路作用的截止阀可以设置在第一制冷剂通路上，也可以设置在第二制冷剂通路上，或者如图3所示，在第一制冷剂通路和第二制冷剂通路上分别设置一路独立工作的截止阀(17，18)。在制冷剂循环中还设置有泄压阀EEV19，泄压阀EEV19的第一端连通第一制冷剂管路，泄压阀EEV19的第二端连通第二制冷剂管路。泄压阀EEV19优选为电磁阀，其可以接收空调器1控制器输出的电信号，以在空调器1控制器的控制下，在关闭状态和打开状态之间切换，降低制冷剂管路中的瞬时压力。在压缩机12的排气端设置有第一压力传感器15以检测排气端的排气压力，在压缩机12的回气端设置有第二压力传感器16以检测回气端的回气压力。In view of the negligence of the installer, the failure of the shut-off valve itself, or the communication failure, the air conditioner may be turned on directly without fully opening the valve. The specific control flow of a newly designed air conditioner control method is shown in Figure 1. Shown. This air conditioner control method takes into account the user's air conditioner use needs, while protecting the air conditioner to ensure that the main components such as the system and the compressor are not damaged. With this control method, the safety accidents of refrigerant pipeline rupture and refrigerant leakage caused by the failure of the valve can be completely eliminated. Fig. 3 is an internal structure diagram of an air conditioner applying the control method disclosed in the present invention. This air conditioner 1 includes an indoor heat exchanger 10, an outdoor heat exchanger 11, a compressor 12, a throttling device 14, and a four-way valve 13 for switching the refrigerant flow direction according to different air conditioning modes. Wherein, the operating frequency of the compressor 12 can be continuously changed according to the change of the indoor air-conditioning load. For ease of description, the refrigerant path between the indoor heat exchanger 10 and the outdoor heat exchanger 11 is defined as the first refrigerant path, and the refrigerant path between the outdoor heat exchanger 11 and the indoor heat exchanger 10 is defined as the first refrigerant path. Two refrigerant passages. The shut-off valve that functions to close or open the refrigerant circuit can be arranged on the first refrigerant passage, or on the second refrigerant passage, or as shown in FIG. 3, in the first refrigerant passage and the second refrigerant passage. An independently working stop valve (17, 18) is respectively arranged on the agent passage. A pressure relief valve EEV19 is also provided in the refrigerant cycle. The first end of the pressure relief valve EEV19 is connected to the first refrigerant pipeline, and the second end of the pressure relief valve EEV19 is connected to the second refrigerant pipeline. The pressure relief valve EEV19 is preferably a solenoid valve, which can receive the electrical signal output by the controller of the air conditioner 1 to switch between the closed state and the open state under the control of the air conditioner 1 controller to reduce the refrigerant in the refrigerant pipeline. Instantaneous pressure. A first pressure sensor 15 is provided at the discharge end of the compressor 12 to detect the discharge pressure at the discharge end, and a second pressure sensor 16 is provided at the return air end of the compressor 12 to detect the return air pressure at the return air end.
如图1所示，为达到保护和使用的双重控制效果，本实施例所公开的空调器控制方法包括以下步骤：As shown in Figure 1, in order to achieve the dual control effect of protection and use, the air conditioner control method disclosed in this embodiment includes the following steps:
空调器开机，在第一设定周期内，采样压缩机排气端的第一压力传感器的压力检测值，记为第一高压检测值。采样压缩机回气端的第二压力传感器的压力检测值，记为第一低压检测值。计算第一压力比，第一压力比为第一高压检测值和第一低压检测值的比值。The air conditioner is turned on, and in the first set period, the pressure detection value of the first pressure sensor at the discharge end of the compressor is sampled and recorded as the first high pressure detection value. The pressure detection value of the second pressure sensor at the return air end of the sampling compressor is recorded as the first low pressure detection value. The first pressure ratio is calculated, and the first pressure ratio is the ratio of the first high-pressure detection value to the first low-pressure detection value.
在与第一设定周期连续的第二设定周期内，再次采样压缩机排气端的第一压力传感器的压力检测值，记为第二高压检测值。再次采样压缩机回气端的第二压力传感器的压力检测值，记为第二低压检测值。计算第二压力比，第二压力比为第二高压检测值和第二低压检测值的比值。In the second set period that is continuous with the first set period, the pressure detection value of the first pressure sensor at the discharge end of the compressor is sampled again and recorded as the second high pressure detection value. Sampling again the pressure detection value of the second pressure sensor at the return end of the compressor is recorded as the second low pressure detection value. The second pressure ratio is calculated, and the second pressure ratio is the ratio of the second high pressure detection value to the second low pressure detection value.
根据第一压力比和第二压力比确定压缩机频率变化速度，并按照压缩机频率变化速度控制压缩机运行。The compressor frequency change speed is determined according to the first pressure ratio and the second pressure ratio, and the compressor operation is controlled according to the compressor frequency change speed.
其中，第一设定周期和第二设定周期的时长优选根据空调能力进行选取， 第一设定周期和第二设定周期的时长优选设置为是相同的，以充分反映在连续的两个固有周期内***压力比的连续变化。在如图1所示的空调器控制方法中，通过两个周期的连续监测，即可以准确判定当前压缩机工作状态是否与***压力比适配，并根据适配状态确定下一个周期内的压缩机频率变化速度。在***压力比适配的条件下，适当以调节空调房间负荷为首要目标调节压缩机频率变化速度；在***压力比不适配的条件下，主动干预，改变压缩机频率变化速度，形成动态的调节方案，确保由多个部件、多个换热过程组成且受到多种外部条件影响的复杂耦合空调***保持稳定安全。Wherein, the duration of the first set period and the second set period are preferably selected according to the air conditioning capability, and the duration of the first set period and the second set period are preferably set to be the same, so as to be fully reflected in the two consecutive settings. The continuous change of the system pressure ratio during the natural period. In the air conditioner control method as shown in Figure 1, through two cycles of continuous monitoring, it is possible to accurately determine whether the current compressor working status is adapted to the system pressure ratio, and to determine the compression in the next cycle according to the adapted status The speed of machine frequency change. Under the condition that the system pressure ratio is adapted, adjust the compressor frequency change speed with adjusting the air-conditioning room load as the primary goal; under the condition of the system pressure ratio not adapting, actively intervene to change the compressor frequency change speed to form a dynamic The adjustment scheme ensures that the complex coupled air-conditioning system composed of multiple components and multiple heat exchange processes and affected by multiple external conditions remains stable and safe.
按照压缩机频率变化速度控制压缩机运行具体可以采用如图2所示的方式。容易理解的是，空调器开机后，如果当前空调房间环境温度和用户设定温度之间的温差较大，则室内空调负荷较大，压缩机转速需要快速上升；如果当前空调房间环境温度和用户设定温度之间的温差较小，则室内空调负荷较小，压缩机转速需要慢速上升。频率快速上升和频率慢速上升的上升速度通常是一个定值,例如快速上升时设定频率变化为2Hz/s，慢速上升时为1Hz/2s等等，在此不对速度的具体数值进行限定。在如图2所示的控制方法中，在开机之后，优选保持同样的控制策略，在根据温差开始运行的同时开始进行第一设定周期内的压力检测值采样。在采样得到第一压力比之后，则开始根据***压力比干预压缩机频率变化速度。The specific method shown in Fig. 2 can be used to control the operation of the compressor according to the change speed of the compressor frequency. It is easy to understand that after the air conditioner is turned on, if the temperature difference between the current air-conditioned room ambient temperature and the user's set temperature is large, the indoor air-conditioning load is large, and the compressor speed needs to rise quickly; if the current air-conditioned room ambient temperature and the user’s If the temperature difference between the set temperatures is small, the indoor air-conditioning load is small, and the compressor speed needs to rise slowly. The rising speed of rapid frequency rise and slow frequency rise is usually a fixed value. For example, the frequency change is set to 2Hz/s for fast rise, 1Hz/2s for slow rise, etc. The specific value of the speed is not limited here. . In the control method shown in FIG. 2, after power-on, the same control strategy is preferably maintained, and the pressure detection value sampling in the first set period is started at the same time when the operation is started according to the temperature difference. After the first pressure ratio is sampled, it starts to intervene in the speed of the compressor frequency change according to the system pressure ratio.
具体来说，空调控制器中存储有压力比设定区间和设定压缩机频率变化速度的一一对应关系。这种一一对应关系遵循以下规律，即压力比设定区间的上限阈值越小，即***压力比越小，允许的设定压缩机频率变化速度，尤其是压缩机频率的升频速度越大。一种可选的方式时设定三个设定压力比区间，如果第一压力比属于第一设定压力比区间，则设定压缩机频率变化速度为第一升频速度；如果第一压力比属于第二设定压力比区间，则设定压缩机频率变化速度为第二升频速度；如果第一压力比属于第三设定压力比区间，则设定压缩机频率变化速度为第三升频速度。其中，第一升频速度大于第二升频速度，第二升 频速度大于或者等于第三升频速度。第一升频速度可以设置为2Hz/s，第二升频速度可以设置为1Hz/s，第三升频速度可以设置为1Hz/2s。也可以将第二升频速度和第三升频速度均设置为1Hz/2s。第一设定压力比区间、第二设定压力比区间和第三设定压力比区间连续且上限阈值依次递增。例如，可以设置第一设定压力比区间为[1,3]，第二设定压力比区间为(3,6]，第三设定压力比区间为(6,9]。在这个阶段，***默认开机状态下，空调正常运行，压缩机频率需要保持上升以消除空调房间温度和设定温度之间的温差。在获得第一升频速度、第二升频速度和第三升频速度之后，***并不即刻进行干预。如图2所示，***保持对第一压力传感器和第二压力传感器的压力采样，并计算第二压力比，在得到第二压力比后，根据第二压力比校准设定压缩机频率变化速度，得到校准压缩机变频速度。控制压缩机按照校准压缩机变频速度运行。Specifically, the air-conditioning controller stores a one-to-one correspondence between the pressure ratio setting interval and the set compressor frequency change speed. This one-to-one correspondence follows the following law, that is, the smaller the upper threshold of the pressure ratio setting interval, that is, the smaller the system pressure ratio, the allowable set compressor frequency change speed, especially the higher the compressor frequency up-frequency speed. . An optional way is to set three set pressure ratio intervals, if the first pressure ratio belongs to the first set pressure ratio interval, set the compressor frequency change speed to the first up-frequency speed; if the first pressure ratio If the ratio belongs to the second set pressure ratio interval, the compressor frequency change speed is set to the second up-conversion speed; if the first pressure ratio belongs to the third set pressure ratio interval, the compressor frequency change speed is set to the third Upscaling speed. Wherein, the first up-conversion speed is greater than the second up-conversion speed, and the second up-conversion speed is greater than or equal to the third up-conversion speed. The first up-frequency speed can be set to 2Hz/s, the second up-frequency speed can be set to 1Hz/s, and the third up-frequency speed can be set to 1Hz/2s. It is also possible to set both the second up-conversion speed and the third up-conversion speed to 1Hz/2s. The first set pressure ratio interval, the second set pressure ratio interval, and the third set pressure ratio interval are continuous and the upper limit threshold value increases sequentially. For example, you can set the first set pressure ratio interval to [1,3], the second set pressure ratio interval to (3,6], and the third set pressure ratio interval to (6,9). At this stage, When the system is turned on by default, the air conditioner is operating normally, and the compressor frequency needs to keep rising to eliminate the temperature difference between the air-conditioning room temperature and the set temperature. After obtaining the first, second, and third up-conversion speeds , The system does not immediately intervene. As shown in Figure 2, the system keeps sampling the pressure of the first pressure sensor and the second pressure sensor, and calculates the second pressure ratio. After the second pressure ratio is obtained, the second pressure ratio The calibration sets the compressor frequency change speed to obtain the calibrated compressor frequency conversion speed. The compressor is controlled to run at the calibrated compressor frequency conversion speed.
在校准的过程中，***不再默认压缩机频率需要继续维持上升的趋势，而是充分考虑***压力比的变化，并根据***压力比的具体情况干预压缩机的运行，避免按照原始的控制模式执行而未识别未开阀故障导致***频繁工作在超过压力警戒线的水平，致使长时间的高压运行的管路发生破裂，导致制冷剂泄漏的安全事故。根据第二压力比校准设定压缩机频率变化速度，得到校准压缩机变频速度具体包括以下步骤：During the calibration process, the system no longer assumes that the compressor frequency needs to continue to maintain a rising trend, but fully considers the changes in the system pressure ratio, and intervenes in the operation of the compressor according to the specific conditions of the system pressure ratio, avoiding the original control mode Execution without recognition and unopened valve failure caused the system to frequently work at a level that exceeded the pressure warning line, causing a rupture of the pipeline for long-term high-pressure operation, resulting in a safety accident of refrigerant leakage. The frequency change speed of the compressor is calibrated and set according to the second pressure ratio, and obtaining the calibrated frequency conversion speed of the compressor specifically includes the following steps:
如果第二压力比属于第一设定压力比区间，说明在开机运行一段时间后，***压力比还保持在较低水平，工作状态稳定，出现安全事故的风险小，即保持设定压缩机频率变化速度不变，也就是在这个步骤得到的校准压缩机变频速度等于设定压缩机频率变化速度，控制压缩机按照既定控制策略继续升频运行，以满足调节空调房间负荷的需要。If the second pressure ratio belongs to the first set pressure ratio range, it means that the system pressure ratio remains at a low level after a period of startup operation, the working state is stable, and the risk of safety accidents is small, that is, the set compressor frequency is maintained The change speed remains the same, that is, the calibrated compressor frequency conversion speed obtained in this step is equal to the set compressor frequency change speed, and the compressor is controlled to continue up-frequency operation according to the established control strategy to meet the needs of adjusting the load of the air-conditioned room.
如果第二压力比属于第二设定压力比区间，说明在开机运行一段时间后，***压力比稳定并维持在合理水平，如果继续升频，则可能出现***压力比过高的工况，即控制压缩机不再升频运行，也就是在这个步骤得到的校准压缩机变频速度等于0，压缩机频率不再增加，控制压缩机保持当前运行频率不变， 定频运行，以避免***压力比继续升高。If the second pressure ratio belongs to the second set pressure ratio range, it means that the system pressure ratio is stable and maintained at a reasonable level after a period of start-up operation. If the frequency continues to increase, the system pressure ratio may be too high, that is, Control the compressor to no longer run at up-frequency, that is, the calibrated compressor frequency conversion speed obtained in this step is equal to 0, the compressor frequency no longer increases, and the compressor is controlled to keep the current operating frequency unchanged and run at a fixed frequency to avoid system pressure ratios. Continue to rise.
如果第二压力比属于第三设定压力比区间，说明在开机运行一段时间后，***压力比处于较高水平，可能存在未开阀的情况，即将设定压缩机频率变化速度校准为设定降频速度，控制压缩机降频运行，以降低***压力比。If the second pressure ratio belongs to the third set pressure ratio range, it means that the system pressure ratio is at a relatively high level after the start-up operation for a period of time, and the valve may not be opened. That is, the compressor frequency change speed is set to be calibrated Frequency reduction speed, control the compressor to reduce frequency operation to reduce the system pressure ratio.
在上述步骤中，降频速度根据***压力比升高的幅度确定：In the above steps, the frequency reduction speed is determined according to the increase in the system pressure ratio:
如果在第一设定周期内，第一压力比属于第一设定压力比区间，则如果进一步得到第二压力比属于第三设定压力比区间，说明在开机运行一段时间后，***压力比急速升高，***故障的风险高，将设定压缩机频率变化速度，即第一升频速度校准为第一设定降频速度，即在第二设定周期结束时，不执行升频运行，而是执行快速降频运行，牺牲空调使用需求，优先保障***安全。If in the first set period, the first pressure ratio belongs to the first set pressure ratio interval, if it is further obtained that the second pressure ratio belongs to the third set pressure ratio interval, it means that the system pressure ratio is Rapid increase, the risk of system failure is high, the compressor frequency change speed will be set, that is, the first up-frequency speed will be calibrated to the first set down-frequency speed, that is, the up-frequency operation will not be performed at the end of the second set period Instead, it performs fast frequency reduction operation, sacrificing the demand for air-conditioning, and prioritizing system safety.
如果在第一设定周期内，第一压力比属于第二设定压力比区间，则如果进一步得到第二压力比属于第三设定压力比区间，说明刚开机时，***压力比就较大，而***压力比升高并不剧烈，将设定压缩机频率变化速度，即第二升频速度校准为第二设定降频速度，即在第二设定周期结束时，不执行升频运行，而是执行慢速降频运行，以优先保障***安全，同时兼顾空调使用需求。If in the first set period, the first pressure ratio belongs to the second set pressure ratio interval, and if it is further obtained that the second pressure ratio belongs to the third set pressure ratio interval, it means that the system pressure ratio is larger when it is just started. , And the system pressure ratio does not increase drastically, the compressor frequency change speed is set, that is, the second up-frequency speed is calibrated to the second set down-frequency speed, that is, the up-frequency is not executed at the end of the second set period Instead, it performs slow frequency reduction operation to give priority to system safety, while taking into account the needs of air-conditioning.
如果在第一设定周期内，第一压力比属于第三设定压力比区间，则如果进一步得到第二压力比属于第三设定压力比区间，则说明在开机后的一段时间，***压力比并没有明显的升高而是维持稳定的高压力比工况，将设定压缩机频率变化速度，即第三升频速度校准为第三设定降频速度，即在第二设定周期结束时，不执行升频运行，而是执行慢速降频运行，以优先保障***安全，同时在高压力比的状态下，依旧兼顾空调使用需求。If in the first set period, the first pressure ratio belongs to the third set pressure ratio interval, and if it is further obtained that the second pressure ratio belongs to the third set pressure ratio interval, it means that the system pressure The ratio does not increase significantly but maintains a stable high pressure ratio operating condition, and the set compressor frequency change speed, that is, the third up-frequency speed is calibrated to the third set down-frequency speed, that is, in the second set period At the end, the frequency-up operation is not performed, but a slow frequency-down operation is performed to give priority to the safety of the system, and at the same time, the air-conditioning needs are still taken into account under the state of high pressure ratio.
优选的，第一设定降频速度的绝对值大于第二设定降频速度的绝对值，第二设定降频速度的绝对值大于等于第三设定降频速度的绝对值。第一设定降频速度可以设置为-2Hz/s，第二设定降频速度可以设置为-1Hz/s，第三设定降频速度可以设置为-1Hz/2s。也可以将第二设定降频速度和第三设定降频速度均设置为-1Hz/2s。Preferably, the absolute value of the first set frequency reduction speed is greater than the absolute value of the second set frequency reduction speed, and the absolute value of the second set frequency reduction speed is greater than or equal to the absolute value of the third set frequency reduction speed. The first set frequency reduction speed can be set to -2Hz/s, the second set frequency reduction speed can be set to -1Hz/s, and the third set frequency reduction speed can be set to -1Hz/2s. It is also possible to set both the second set frequency reduction speed and the third set frequency reduction speed to -1Hz/2s.
在上述的控制过程中，均是对压缩机频率变化速度的前置干预，避免出现风险较高的运行工况。但是，实际上，也存在更为极端的运行工况。因此，特别设置在计算出第一压力比后，首先判定第一压力比是否属于保护压力比区间。如果第一压力比属于保护压力比区间，则直接控制压缩机停机并停止根据第二压力比校准设定压缩机频率变化速度。其中，保护压力比区间与第三设定压力比区间连续，且保护压力比区间的下限阈值大于第三设定压力比的上限阈值。保护压力比区间的下限阈值可以设置为大于9。In the above control process, it is the pre-intervention of the compressor frequency change speed to avoid the risky operating conditions. However, in fact, there are also more extreme operating conditions. Therefore, after calculating the first pressure ratio, it is particularly set to first determine whether the first pressure ratio belongs to the protection pressure ratio interval. If the first pressure ratio belongs to the protection pressure ratio range, the compressor is directly controlled to stop and stop setting the compressor frequency change speed according to the second pressure ratio calibration. Wherein, the protection pressure ratio interval is continuous with the third set pressure ratio interval, and the lower limit threshold value of the protection pressure ratio interval is greater than the upper limit threshold value of the third set pressure ratio. The lower limit threshold of the protection pressure ratio interval can be set to be greater than 9.
停止根据第二压力比校准设定压缩机频率变化速度的同时，***还是保持对第二压力比的监测，如果第二压力比属于第一设定压力比区间，则说明压缩机停机即显著降低了***压力比，硬件上无需进行干预，控制压缩机停机的同时保持泄压阀EEV关闭。这样，如果是负荷剧烈变化导致第一压力比短时间超过保护设定压力比设定区间的下限阈值，则在及时干预的同时，也可以保证空调再次开机时可以保持负荷消除条件下的正常连续运行状态，无需额外的等待时间。如果所述第二压力比不属于第一设定压力比区间，则控制压缩机停机的同时控制泄压阀EEV开阀，利用泄压阀EEV调节***压力比。While stopping to calibrate and set the compressor frequency change speed according to the second pressure ratio, the system still maintains the monitoring of the second pressure ratio. If the second pressure ratio belongs to the first set pressure ratio range, it means that the compressor stops significantly. In order to improve the system pressure ratio, no hardware intervention is required to control the compressor to stop while keeping the pressure relief valve EEV closed. In this way, if a drastic load change causes the first pressure ratio to exceed the lower limit threshold of the protection setting pressure ratio setting interval for a short time, while intervening in time, it can also ensure that the air conditioner can maintain normal continuous under load elimination conditions when the air conditioner is turned on again. Running status, no additional waiting time is required. If the second pressure ratio does not belong to the first set pressure ratio interval, the compressor is controlled to stop while the pressure relief valve EEV is controlled to open, and the pressure relief valve EEV is used to adjust the system pressure ratio.
类似的，在计算出第二压力比后，也首先判定第二压力比是否属于保护压力比区间。如果第二压力比属于保护压力比区间，则控制压缩机停机。如果第一压力比和第二压力比均处于保护压力比区间，则控制压缩机停机的同时控制泄压阀EEV开阀，利用泄压阀EEV调节***压力比。Similarly, after the second pressure ratio is calculated, it is first determined whether the second pressure ratio belongs to the protection pressure ratio interval. If the second pressure ratio belongs to the protection pressure ratio range, the compressor is controlled to stop. If the first pressure ratio and the second pressure ratio are both in the protection pressure ratio range, the compressor is controlled to stop while the pressure relief valve EEV is controlled to open, and the pressure relief valve EEV is used to adjust the system pressure ratio.
第一压力比、第二压力比、校准压缩机变频速度和泄压阀EEV的工作状态的一种可选取值如下表所示，其中，K1代表第一压力比，K2代表第二压力比，第一升频速度V up1大于第二升频速度V up2，第二升频速度V up2大于或者等于第三升频速度；第一设定降频速度V down1大于第二设定降频速度V down2，第二设定降频速度V down2大于或等于第三设定降频速度V down3。也就是说，在连续的两个采样周期内，如果***压力比均属于较低的范围内，则***保持升频，如果***压力比均属于合理的范围内，则***保持频率不变，而***压力比属 于较高的范围内，则***保持降频。从而在保证空调器合理运行的同时，将***的风险控制在合理水平，例如，在***压力比较高时，不会出现压缩机继续高频运行的情况，使得空调器的运行更为安全。 One of the selectable values of the first pressure ratio, the second pressure ratio, the frequency conversion speed of the calibrated compressor, and the working state of the pressure relief valve EEV is shown in the following table, where K1 represents the first pressure ratio, and K2 represents the second pressure ratio , The first up- conversion speed V up1 is greater than the second up- conversion speed V up2, the second up- conversion speed V up2 is greater than or equal to the third up-conversion speed; the first set frequency-down speed V down1 is greater than the second set frequency-down speed V down2 , the second set frequency reduction speed V down2 is greater than or equal to the third set frequency reduction speed V down3 . That is to say, in two consecutive sampling periods, if the system pressure ratio is in a lower range, the system keeps the frequency up; if the system pressure ratio is in a reasonable range, the system keeps the frequency unchanged, and If the system pressure ratio is in a higher range, the system keeps frequency reduction. Therefore, while ensuring the reasonable operation of the air conditioner, the risk of the system is controlled at a reasonable level. For example, when the system pressure is relatively high, the compressor will not continue to operate at high frequency, making the operation of the air conditioner safer.
Figure PCTCN2021073902-appb-000001
Figure PCTCN2021073902-appb-000001
可以理解的是，未开阀状态属于空调器的一种故障。在实际生产和使用的过程中所出现的频率相对较低，因此，对于普通的分体式空调器来说，还是以减少并消除空调房间环境温度和用户设定温度之间的温差作为控制***的控制目标来控制压缩机的运行频率，这种控制策略具有最高的优先级。优选的，在以温差作为空调器的控制目标进行频率控制的过程中，按照设定采样周期采样压力比，如果压力比出现属于保护压力比区间的情况，则首先执行对压缩机的停机保护，并随后切换按照上述实施例中所描述的控制方法确定压缩机频率变化速度，并按照压缩机频率变化速度控制压缩机运行。It is understandable that the unopened valve state is a failure of the air conditioner. In the actual production and use process, the frequency is relatively low. Therefore, for ordinary split air conditioners, the control system is to reduce and eliminate the temperature difference between the ambient temperature of the air-conditioned room and the user set temperature. The control target is used to control the operating frequency of the compressor. This control strategy has the highest priority. Preferably, in the process of frequency control with the temperature difference as the control target of the air conditioner, the pressure ratio is sampled according to the set sampling period. If the pressure ratio falls within the protection pressure ratio range, the compressor shutdown protection is performed first. And then switch to determine the compressor frequency change speed according to the control method described in the above embodiment, and control the compressor operation according to the compressor frequency change speed.
本申请实施例还提供一种空调器，应用上述空调器控制方法。空调器控制方法的具体步骤参见上述实施例的详细描述和说明书附图的详细描绘。在此不再赘述，采用上述空调器控制方法的空调器可以实现同样的技术效果。The embodiment of the present application also provides an air conditioner, which applies the above-mentioned air conditioner control method. For specific steps of the air conditioner control method, refer to the detailed description of the above-mentioned embodiment and the detailed description of the accompanying drawings in the specification. It will not be repeated here, and the air conditioner adopting the above air conditioner control method can achieve the same technical effect.
本申请实施例还提供一种计算机存储介质，其中，该计算机存储介质存储于电子数据交换的计算机程序，该计算机程序使得空调器执行如上方法实施例中记载的任一方法的部分或全部步骤。An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium is stored in a computer program for electronic data exchange, and the computer program causes the air conditioner to perform part or all of the steps of any method described in the above method embodiment.
在上述实施例中，对各个实施例的描述均各有侧重，某个实施例中没有详 述的部分，可以参见其它实施例的相关描述。In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in an embodiment, reference may be made to related descriptions of other embodiments.
在本申请所提供的几个实施例中，应该理解到，所揭露的装置，可通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如上述单元或模块的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个***，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接，可以是电性或其它的形式。In the several embodiments provided in this application, it should be understood that the disclosed device may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the above-mentioned units or modules is only a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical or other forms.
上述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个物理空间，或者也可以分布到多个网络单元上，可以根据实际需要选择其中的部分或者全部单元来实现本实施例方案的目的。The units described above as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one physical space, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
以上实施例仅用以说明本发明的技术方案，而非对其进行限制；尽管参照前述实施例对本发明进行了详细的说明，对于本领域的普通技术人员来说，依然可以对前述实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或替换，并不使相应技术方案的本质脱离本发明所要求保护的技术方案的精神和范围。The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, for those of ordinary skill in the art, the technical solutions of the foregoing embodiments can still be described. The recorded technical solutions are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims (10)

  1. 一种空调器控制方法，其特征在于，包括以下步骤:An air conditioner control method is characterized in that it comprises the following steps:
    空调器开机，在第一设定周期内：When the air conditioner is turned on, in the first set period:
    采样压缩机排气端的第一高压检测值；Sampling the first high pressure detection value at the discharge end of the compressor;
    采样压缩机回气端的第一低压检测值；Sampling the first low pressure detection value at the return air end of the compressor;
    计算第一压力比，所述第一压力比为所述第一高压检测值和所述第一低压检测值的比值；Calculating a first pressure ratio, where the first pressure ratio is a ratio of the first high pressure detection value to the first low pressure detection value;
    在与所述第一设定周期连续的第二设定周期内：In the second setting period consecutive to the first setting period:
    采样压缩机排气端的第二高压检测值；Sampling the second high pressure detection value at the discharge end of the compressor;
    采样压缩机回气端的第二低压检测值；Sampling the second low pressure detection value at the return air end of the compressor;
    计算第二压力比，所述第二压力比为所述第二高压检测值和所述第二低压检测值的比值；Calculating a second pressure ratio, where the second pressure ratio is a ratio of the second high pressure detection value to the second low pressure detection value;
    根据所述第一压力比和第二压力比确定压缩机频率变化速度，并按照所述压缩机频率变化速度控制压缩机运行。The compressor frequency change speed is determined according to the first pressure ratio and the second pressure ratio, and the compressor operation is controlled according to the compressor frequency change speed.
  2. 根据权利要求1所述的空调器控制方法，其特征在于，还包括以下步骤：The air conditioner control method according to claim 1, characterized in that it further comprises the following steps:
    在得到所述第一压力比后，根据所述第一压力比调用对应的设定压缩机频率变化速度；After obtaining the first pressure ratio, call the corresponding set compressor frequency change speed according to the first pressure ratio;
    在得到所述第二压力比后，根据所述第二压力比校准所述设定压缩机频率变化速度，得到校准压缩机变频速度；After obtaining the second pressure ratio, calibrate the set compressor frequency change speed according to the second pressure ratio to obtain a calibrated compressor frequency conversion speed;
    控制压缩机按照所述校准压缩机变频速度运行。The compressor is controlled to operate according to the calibrated compressor variable frequency speed.
  3. 根据权利要求2所述的空调器控制方法，其特征在于：The air conditioner control method according to claim 2, wherein:
    根据所述第一压力比调用对应的设定压缩机频率变化速度包括以下步骤：Invoking the corresponding set compressor frequency change speed according to the first pressure ratio includes the following steps:
    如果所述第一压力比属于第一设定压力比区间，则设定压缩机频率变化速度为第一升频速度；If the first pressure ratio belongs to the first set pressure ratio interval, set the compressor frequency change speed to the first frequency up speed;
    如果所述第一压力比属于第二设定压力比区间，则设定压缩机频率变化速度为第二升频速度；If the first pressure ratio belongs to the second set pressure ratio interval, set the compressor frequency change speed to the second frequency up speed;
    如果所述第一压力比属于第三设定压力比区间，则设定压缩机频率变化速度为第三升频速度；If the first pressure ratio belongs to the third set pressure ratio interval, set the compressor frequency change speed to the third frequency up speed;
    其中，所述第一升频速度大于所述第二升频速度，所述第二升频速度大于或等于所述第三升频速度；所述第一设定压力比区间、第二设定压力比区间和第三设定压力比区间连续且上限阈值依次递增。Wherein, the first up-conversion speed is greater than the second up-conversion speed, the second up-conversion speed is greater than or equal to the third up-conversion speed; the first set pressure ratio interval, the second set The pressure ratio interval and the third set pressure ratio interval are continuous and the upper limit threshold value increases sequentially.
  4. 根据权利要求3所述的空调器控制方法，其特征在于：The air conditioner control method according to claim 3, wherein:
    根据所述第二压力比校准所述设定压缩机频率变化速度，得到校准压缩机变频速度包括以下步骤：Calibrating the set compressor frequency change speed according to the second pressure ratio to obtain the calibrated compressor frequency conversion speed includes the following steps:
    如果所述第二压力比属于第一设定压力比区间，则保持所述设定压缩机频率变化速度不变，所述校准压缩机变频速度等于所述设定压缩机频率变化速度，控制压缩机升频运行；If the second pressure ratio belongs to the first set pressure ratio interval, keep the set compressor frequency change speed unchanged, the calibrated compressor frequency conversion speed is equal to the set compressor frequency change speed, and control the compression Up-frequency operation of the machine;
    如果所述第二压力比属于第二设定压力比区间，则控制压缩机保持当前运行频率不变定频运行；If the second pressure ratio belongs to the second set pressure ratio interval, control the compressor to keep the current operating frequency unchanged and operate at a constant frequency;
    如果所述第二压力比属于第三设定压力比区间，则将所述设定压缩机频率变化速度校准为设定降频速度，控制压缩机降频运行。If the second pressure ratio belongs to the third set pressure ratio interval, the set compressor frequency change speed is calibrated to the set frequency reduction speed, and the compressor is controlled to run at reduced frequency.
  5. 根据权利要求4所述的空调器控制方法，其特征在于：The air conditioner control method according to claim 4, wherein:
    将所述设定压缩机频率变化速度校准为设定降频速度时包括以下步骤：The calibration of the set compressor frequency change speed to the set frequency reduction speed includes the following steps:
    如果在第一设定周期内，所述第一压力比属于第一设定压力比区间，则将所述设定压缩机频率变化速度校准为第一设定降频速度；If in the first set period, the first pressure ratio belongs to the first set pressure ratio interval, calibrate the set compressor frequency change speed to the first set frequency reduction speed;
    如果在第一设定周期内，所述第一压力比属于第二设定压力比区间，则将所述设定压缩机频率变化速度校准为第二设定降频速度；If in the first set period, the first pressure ratio belongs to the second set pressure ratio interval, calibrate the set compressor frequency change speed to the second set frequency reduction speed;
    如果在第一设定周期内，所述第一压力比属于第三设定压力比区间，则将所述设定压缩机频率变化速度校准为第三设定降频速度；If in the first set period, the first pressure ratio belongs to the third set pressure ratio interval, calibrate the set compressor frequency change speed to the third set frequency reduction speed;
    其中，所述第一设定降频速度的绝对值大于所述第二设定降频速度的 绝对值，所述第二设定降频速度的绝对值大于等于所述第三设定降频速度的绝对值。Wherein, the absolute value of the first set frequency reduction speed is greater than the absolute value of the second set frequency reduction speed, and the absolute value of the second set frequency reduction speed is greater than or equal to the third set frequency reduction speed The absolute value of the speed.
  6. 根据权利要求5所述的空调器控制方法，其特征在于：The air conditioner control method of claim 5, wherein:
    还包括以下步骤：It also includes the following steps:
    计算出所述第一压力比后，首先判定所述第一压力比是否属于保护压力比区间，如果所述第一压力比属于所述保护压力比区间，则控制压缩机停机并停止根据所述第二压力比校准所述设定压缩机频率变化速度；After calculating the first pressure ratio, first determine whether the first pressure ratio belongs to the protection pressure ratio interval, and if the first pressure ratio belongs to the protection pressure ratio interval, control the compressor to stop and stop according to the The second pressure ratio calibrates the set compressor frequency change speed;
    其中所述保护压力比区间与所述第三设定压力比区间连续，且所述保护压力比区间的下限阈值大于所述第三设定压力比的上限阈值。The protection pressure ratio interval is continuous with the third set pressure ratio interval, and the lower limit threshold of the protection pressure ratio interval is greater than the upper limit threshold of the third set pressure ratio.
  7. 根据权利要求6所述的空调器控制方法，其特征在于：The air conditioner control method according to claim 6, wherein:
    还包括以下步骤：It also includes the following steps:
    如果所述第一压力比属于保护压力比区间，则进一步判定所述第二压力比是否属于第一设定压力比区间；If the first pressure ratio belongs to the protection pressure ratio interval, further determining whether the second pressure ratio belongs to the first set pressure ratio interval;
    如果所述第二压力比属于第一设定压力比区间，则控制压缩机停机的同时保持泄压阀关闭；If the second pressure ratio belongs to the first set pressure ratio interval, control the compressor to stop while keeping the pressure relief valve closed;
    其中，所述泄压阀的第一端连通第一制冷剂通路，所述泄压阀的第二端连通第二制冷剂通路；所述第一制冷剂通路设置在室内换热器和室外换热器之间，所述第二制冷剂通路设置在室外换热器和室内换热器之间，所述第一制冷剂通路和/或第二制冷剂通路上设置有截止阀。Wherein, the first end of the pressure relief valve communicates with a first refrigerant passage, and the second end of the pressure relief valve communicates with a second refrigerant passage; the first refrigerant passage is arranged in the indoor heat exchanger and the outdoor heat exchanger. Between the heat exchangers, the second refrigerant passage is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the first refrigerant passage and/or the second refrigerant passage are provided with a shut-off valve.
  8. 根据权利要求2所述的空调器控制方法，其特征在于：The air conditioner control method according to claim 2, wherein:
    还包括以下步骤：It also includes the following steps:
    计算出所述第二压力比后，首先判定所述第二压力比是否属于保护压力比区间，如果所述第二压力比属于所述保护压力比区间，则控制压缩机停机。After the second pressure ratio is calculated, it is first determined whether the second pressure ratio belongs to the protection pressure ratio interval, and if the second pressure ratio belongs to the protection pressure ratio interval, the compressor is controlled to stop.
  9. 根据权利要求8所述的空调器控制方法，其特征在于：The air conditioner control method according to claim 8, wherein:
    还包括以下步骤：It also includes the following steps:
    如果所述第一压力比和第二压力比均处于所述保护压力比区间，则控制压缩机停机并控制泄压阀开阀；If the first pressure ratio and the second pressure ratio are both in the protection pressure ratio range, control the compressor to stop and control the pressure relief valve to open;
    其中，所述泄压阀的第一端连通第一制冷剂通路，所述泄压阀的第二端连通第二制冷剂通路，所述第一制冷剂通路设置在室内换热器和室外换热器之间，所述第二制冷剂通路设置在室外换热器和室内换热器之间，所述第一制冷剂通路和/或第二制冷剂通路上设置有截止阀。Wherein, the first end of the pressure relief valve communicates with a first refrigerant passage, and the second end of the pressure relief valve communicates with a second refrigerant passage, and the first refrigerant passage is arranged in the indoor heat exchanger and the outdoor heat exchanger. Between the heat exchangers, the second refrigerant passage is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the first refrigerant passage and/or the second refrigerant passage are provided with a shut-off valve.
  10. 一种空调器，其特征在于，采用如权利要求1至9任一项所述的空调器控制方法。An air conditioner, characterized in that the air conditioner control method according to any one of claims 1 to 9 is adopted.
PCT/CN2021/073902 2020-03-25 2021-01-27 Control method for air conditioner and air conditioner WO2021190121A1 (en)

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