CN113446706B - Air conditioner control method and air conditioner - Google Patents
Air conditioner control method and air conditioner Download PDFInfo
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- CN113446706B CN113446706B CN202010219046.8A CN202010219046A CN113446706B CN 113446706 B CN113446706 B CN 113446706B CN 202010219046 A CN202010219046 A CN 202010219046A CN 113446706 B CN113446706 B CN 113446706B
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000008859 change Effects 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 44
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 239000003507 refrigerant Substances 0.000 claims description 47
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 230000009467 reduction Effects 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 8
- 238000004378 air conditioning Methods 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 18
- 230000008569 process Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000009977 dual effect Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
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- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Air Conditioning Control Device (AREA)
Abstract
An air conditioner control method includes: the air conditioner is started, and in a first set period: sampling a first high-pressure detection value of a compressor exhaust end; sampling a first low-pressure detection value of an air return end of a compressor; calculating a first pressure ratio; in a second setting period consecutive to the first setting period: sampling a second high-pressure detection value of the exhaust end of the compressor; sampling a second low-pressure detection value of the air return end of the compressor; calculating a second pressure ratio; and determining a compressor frequency change speed according to the first pressure ratio and the second pressure ratio, and controlling the compressor to operate according to the compressor frequency change speed. An air conditioner is also disclosed. The invention can accurately judge whether the working state of the current compressor is matched with the system pressure ratio or not through continuous monitoring of two periods, and determines the frequency change speed of the compressor in the next period according to the matching state, thereby ensuring that the air conditioning system can be kept stable and safe even if the valve is not opened.
Description
Technical Field
The invention belongs to the technical field of air conditioning equipment, and particularly relates to an air conditioner control method and an air conditioner adopting the control method.
Background
The split air conditioner is provided with a stop valve which is arranged on a pipeline connecting the indoor unit and the outdoor unit and plays a role in closing or opening a refrigerant loop. The switch also plays a role when vacuumizing or filling refrigerant.
The split air conditioner is powered on and used, and especially when the split air conditioner is installed and used for the first time, the stop valve is required to be in an open state so as to ensure that the refrigerant between the indoor unit and the outdoor unit normally flows. However, due to the carelessness of the installer, the malfunction of the shut valve itself, or the communication malfunction, there may occur a case where the air conditioner is directly turned on without fully opening the valve. In this state, the operation mode of the air conditioner is abnormal, and particularly, after a certain period of operation, the pressure of the entire refrigerating cycle is increased and exceeds a safety threshold. Some models with shutdown protection may have frequent start-up and, in extreme cases, may have refrigerant lines broken from the walls of the tubes. Resulting in leakage of the refrigerant. The leaked refrigerant can explode when meeting with electric spark, which causes serious safety accidents.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.
Disclosure of Invention
The invention designs and provides an air conditioner control method aiming at the situation that the air conditioner can be directly started under the condition of incomplete full opening of a valve possibly due to negligence of installation personnel, failure of a stop valve or communication failure in the prior art.
In order to realize the purpose of the invention, the invention adopts the following technical scheme to realize:
the air conditioner controlling method includes the following steps: sampling a first high-pressure detection value of a compressor exhaust end; sampling a first low-pressure detection value of an air return end of a compressor; calculating a first pressure ratio that is a ratio of the first high pressure detection value and the first low pressure detection value; in a second setting period consecutive to the first setting period: sampling a second high-pressure detection value of the exhaust end of the compressor; sampling a second low-pressure detection value of the air return end of the compressor; calculating a second pressure ratio that is a ratio of the second high pressure detection value and the second low pressure detection value; and determining a compressor frequency change speed according to the first pressure ratio and the second pressure ratio, and controlling the compressor to operate according to the compressor frequency change speed.
Further, the method also comprises the following steps: after the first pressure ratio is obtained, calling a corresponding set compressor frequency change speed according to the first pressure ratio; after the second pressure ratio is obtained, calibrating the set compressor frequency change speed according to the second pressure ratio to obtain a calibrated compressor variable frequency speed; and controlling the compressor to operate according to the variable frequency speed of the calibrated compressor.
Further, invoking a corresponding set compressor frequency change speed based on the first pressure ratio comprises: setting the frequency variation speed of the compressor to be a first frequency increasing speed if the first pressure ratio belongs to a first set pressure ratio interval; if the first pressure ratio belongs to a second set pressure ratio interval, setting the frequency change speed of the compressor to be a second frequency increasing speed; if the first pressure ratio belongs to a third set pressure ratio interval, setting the frequency change speed of the compressor to be a third frequency increasing speed; wherein the first frequency boost speed is greater than the second frequency boost speed, which is greater than or equal to the third frequency boost 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 is increased in sequence.
Further, calibrating the set compressor frequency variation speed according to the second pressure ratio to obtain a calibrated compressor variable frequency speed comprises the following steps: if the second pressure ratio belongs to a first set pressure ratio interval, keeping the frequency change speed of the set compressor unchanged, and controlling the frequency rising operation of the compressor when the frequency conversion speed of the calibrated compressor is equal to the frequency change speed of the set compressor; if the second pressure ratio belongs to a second set pressure ratio interval, controlling the compressor to keep the current operation frequency unchanged and operate at a fixed frequency; and if the second pressure ratio belongs to a third set pressure ratio interval, calibrating the set compressor frequency change speed to a set frequency reduction speed, and controlling the compressor to perform frequency reduction operation.
Further, the step of calibrating the set compressor frequency variation speed to the set down-conversion speed comprises the following steps: calibrating the set compressor frequency variation speed to a first set down-conversion speed if the first pressure ratio belongs to a first set pressure ratio interval within a first set period; calibrating the set compressor frequency variation speed to a second set frequency reduction speed if the first pressure ratio belongs to a second set pressure ratio interval within a first set period; calibrating the set compressor frequency variation speed to a third set down-conversion speed if the first pressure ratio belongs to a third set pressure ratio interval within a first set period; the absolute value of the first set frequency-reducing speed is greater than the absolute value of the second set frequency-reducing speed, and the absolute value of the second set frequency-reducing speed is greater than or equal to the absolute value of the third set frequency-reducing speed.
Further, the method also comprises the following steps: after the first pressure ratio is calculated, firstly, whether the first pressure ratio belongs to a protection pressure ratio interval is judged, and if the first pressure ratio belongs to the protection pressure ratio interval, the compressor is controlled to stop and the set compressor frequency change speed is calibrated according to the second pressure ratio; wherein the protection pressure ratio interval is continuous with the third set pressure ratio interval, and a lower threshold of the protection pressure ratio interval is greater than an upper threshold of the third set pressure ratio.
Further, the method also comprises the following steps: further determining if the second pressure ratio falls within a first set pressure ratio interval if the first pressure ratio falls within a guard pressure ratio interval; if the second pressure ratio belongs to a first set pressure ratio interval, controlling the compressor to stop and keeping the pressure relief valve closed at the same time; a first end of the pressure relief valve is communicated with a first refrigerant passage, and a second end of the pressure relief valve is communicated with a second refrigerant 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, and a stop valve is arranged on the first refrigerant passage and/or the second refrigerant passage.
Further, the method also comprises the following steps: after the second pressure ratio is calculated, whether the second pressure ratio belongs to a protection pressure ratio interval or not is firstly determined, and if the second pressure ratio belongs to the protection pressure ratio interval, the compressor is controlled to stop.
Further, the method also comprises the following steps: if the first pressure ratio and the second pressure ratio are both in the protection pressure ratio interval, controlling the compressor to stop and controlling the pressure relief valve to open; the first end of the pressure relief valve is communicated with a first refrigerant passage, the second end of the pressure relief valve is communicated with a second refrigerant 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, and a stop valve is arranged on the first refrigerant passage and/or the second refrigerant passage.
Another aspect of the present invention provides an air conditioner, which adopts the following control method: the method comprises the following steps that the air conditioner is started, and in a first set period: sampling a first high-pressure detection value of a compressor exhaust end; sampling a first low-pressure detection value of an air return end of a compressor; calculating a first pressure ratio that is a ratio of the first high pressure detection value and the first low pressure detection value; in a second setting period consecutive to the first setting period: sampling a second high-pressure detection value of the exhaust end of the compressor; sampling a second low-pressure detection value of the air return end of the compressor; calculating a second pressure ratio that is a ratio of the second high pressure detection value and the second low pressure detection value; and determining a compressor frequency change speed according to the first pressure ratio and the second pressure ratio, and controlling the compressor to operate according to the compressor frequency change speed.
Compared with the prior art, the invention has the advantages and positive effects that:
the invention can accurately judge whether the working state of the current compressor is matched with the system pressure ratio through continuous monitoring of two periods, and determines the frequency change speed of the compressor in the next period according to the matching state. Under the condition of adapting the system pressure ratio, properly adjusting the frequency change speed of the compressor by taking the adjustment of the air conditioner room load as a primary target; under the condition that the system pressure ratio is not adaptive, active intervention is carried out, the frequency change speed of the compressor is changed, a dynamic adjusting scheme is formed, and the complex coupled air conditioning system which is composed of a plurality of components and a plurality of heat exchange processes and is influenced by various external conditions is ensured to be stable and safe even if the valve is not opened.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a first embodiment of a method for controlling an air conditioner according to the present invention;
FIG. 2 is a flow chart illustrating a second embodiment of a method for controlling an air conditioner according to the present invention;
fig. 3 is a schematic structural diagram of an air conditioner to which the air conditioner control method provided by the present invention is applied.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The terms "first," "second," "third," and the like in the description and in the claims, and in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "include" and "have," as well as any variations thereof, represent non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. One skilled in the art will appreciate that the embodiments described herein can be combined with other embodiments.
A specific control flow of a completely new design of air conditioner control method is shown in fig. 1, aiming at the situation that the air conditioner is directly started under the condition that the valve is not fully opened, which may occur due to the negligence of an installer, the fault of the stop valve itself or the communication fault. The air conditioner control method protects the air conditioner while considering the use requirements of the air conditioner of a user, and ensures that main components such as a system, a compressor and the like are not damaged. By adopting the control method, the safety accidents of refrigerant pipeline breakage and refrigerant leakage caused by the unopened valve can be completely avoided. Fig. 3 is an internal structure view of an air conditioner to which the disclosed control method is applied. This air conditioner 1 includes an indoor heat exchanger 10, an outdoor heat exchanger 11, a compressor 12, a throttle device 14, and a four-way valve 13 for switching the flow direction of refrigerant according to different air conditioning modes. Wherein the operating frequency of the compressor 12 may be continuously varied according to a variation in the load of the indoor air conditioner. For convenience of description, the refrigerant passage between the indoor heat exchanger 10 and the outdoor heat exchanger 11 is defined as a first refrigerant passage, and the refrigerant passage between the outdoor heat exchanger 11 and the indoor heat exchanger 10 is defined as a second refrigerant passage. The shutoff valve for closing or opening the refrigerant circuit may be provided in the first refrigerant passage, may be provided in the second refrigerant passage, or may be provided with one shutoff valve (17, 18) independently operating in each of the first refrigerant passage and the second refrigerant passage, as shown in fig. 3. A pressure relief valve EEV19 is also provided in the refrigerant cycle, a first end of the pressure relief valve EEV19 communicates with the first refrigerant line, and a second end of the pressure relief valve EEV19 communicates with the second refrigerant line. The pressure relief valve EEV19 is preferably a solenoid valve that can receive an electrical signal output by the controller of the air conditioner 1 to switch between a closed state and an open state to reduce the instantaneous pressure in the refrigerant line under the control of the controller of the air conditioner 1. 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 end of the compressor 12 to detect the return pressure at the return end.
As shown in fig. 1, in order to achieve the dual control effects of protection and use, the air conditioner control method disclosed in this embodiment includes the following steps:
the air conditioner is started, and in a first set period, a pressure detection value of a first pressure sensor at the exhaust end of a compressor is sampled and recorded as a first high-pressure detection value. And sampling a pressure detection value of a second pressure sensor at the air return end of the compressor, and recording the pressure detection value as a first low-pressure detection value. A first pressure ratio is calculated, the first pressure ratio being a ratio of the first high pressure detection value and the first low pressure detection value.
And in a second setting period which is continuous with the first setting period, sampling the pressure detection value of the first pressure sensor at the exhaust end of the compressor again, and recording the pressure detection value as a second high-pressure detection value. And sampling the pressure detection value of a second pressure sensor at the air return end of the compressor again, and recording the pressure detection value as a second low-pressure detection value. A second pressure ratio is calculated, which is a ratio of the second high pressure detection value and the second low pressure detection value.
A compressor frequency change speed is determined based on the first pressure ratio and the second pressure ratio, and compressor operation is controlled in accordance with the compressor frequency change speed.
The duration of the first set period and the duration of the second set period are preferably selected according to the air conditioning capacity, and the duration of the first set period and the duration of the second set period are preferably set to be the same so as to fully reflect the continuous change of the system pressure ratio in two continuous inherent periods. In the air conditioner control method as shown in fig. 1, whether the current compressor operating state is adapted to the system pressure ratio can be accurately determined through continuous monitoring for two cycles, and the compressor frequency variation speed in the next cycle is determined according to the adapted state. Under the condition that the system pressure ratio is adaptive, the frequency change speed of the compressor is adjusted by properly taking the adjustment of the load of the air conditioner room as a primary target; under the condition that the pressure ratio of the system is not adaptive, active intervention is performed, the frequency change speed of the compressor is changed, a dynamic regulation scheme is formed, and the stability and the safety of a complex coupling air-conditioning system which is composed of a plurality of components and a plurality of heat exchange processes and is influenced by various external conditions are ensured.
The control of the compressor operation according to the speed of the compressor frequency variation may specifically be in the manner as shown in fig. 2. It is easy to understand that after the air conditioner is started, if the temperature difference between the current air-conditioning room environment temperature and the user set temperature is large, the indoor air conditioner load is large, and the rotating speed of the compressor needs to be increased rapidly; if the temperature difference between the current air-conditioning room environment temperature and the user set temperature is small, the indoor air-conditioning load is small, and the rotating speed of the compressor needs to be increased slowly. The rising speed of the fast rising frequency and the slow rising frequency is usually a fixed value, for example, the frequency change is set to 2Hz/s in the fast rising, 1Hz/2s in the slow rising, etc., and the specific value of the speed is not limited herein. In the control method shown in fig. 2, after the startup, it is preferable to maintain the same control strategy, and to start sampling the pressure detection value for the first set period while starting the operation according to the temperature difference. After the first pressure ratio is sampled, intervention of the compressor frequency change rate in accordance with the system pressure ratio is commenced.
Specifically, the air conditioner controller stores a one-to-one correspondence relationship between the pressure ratio setting section and the set compressor frequency change speed. This one-to-one correspondence follows a rule that the smaller the upper threshold value of the pressure ratio setting section, i.e., the smaller the system pressure ratio, the larger the allowable setting of the speed of change of the compressor frequency, in particular, the speed of raising the compressor frequency. In an alternative mode, three set pressure ratio intervals are set, and if the first pressure ratio belongs to the first set pressure ratio interval, the frequency change speed of the compressor is set to be the first frequency increasing speed; if the first pressure ratio belongs to a second set pressure ratio interval, setting the frequency change speed of the compressor to be a second frequency increasing speed; and if the first pressure ratio belongs to a third set pressure ratio interval, setting the frequency change speed of the compressor to be a third frequency increasing speed. The first frequency increasing speed is larger than the second frequency increasing speed, and the second frequency increasing speed is larger than or equal to the third frequency increasing speed. The first up-conversion rate may be set to 2Hz/s, the second up-conversion rate may be set to 1Hz/s, and the third up-conversion rate may be set to 1Hz/2 s. It is also possible to set both the second and third up-conversion speeds to 1Hz/2 s. The first set pressure ratio section, the second set pressure ratio section and the third set pressure ratio section are continuous and the upper limit threshold value is increased in sequence. For example, a first set pressure ratio interval of [1,3], a second set pressure ratio interval of (3,6], and a third set pressure ratio interval of (6,9] may be set, at this stage, the air conditioner is normally operated in a default on state of the system, and the frequency of the compressor needs to be kept raised to eliminate the temperature difference between the room temperature of the air conditioner and the set temperature.
In the calibration process, the system does not default to the situation that the frequency of the compressor needs to continuously maintain the rising trend any more, but fully considers the change of the system pressure ratio, intervenes the operation of the compressor according to the specific condition of the system pressure ratio, and avoids the safety accident that the system frequently works at the level exceeding the pressure warning line because the system is executed according to the original control mode without identifying the non-opening valve fault, so that the pipeline of long-time high-pressure operation is broken, and the refrigerant leakage is caused. Setting the frequency change speed of the compressor according to the second pressure ratio calibration to obtain the frequency conversion speed of the calibrated compressor, which specifically comprises the following steps:
if the second pressure ratio belongs to the first set pressure ratio interval, the system pressure ratio is kept at a lower level after the compressor is started to operate for a period of time, the working state is stable, the risk of safety accidents is small, namely, the frequency change speed of the set compressor is kept unchanged, namely, the frequency conversion speed of the calibrated compressor obtained in the step is equal to the frequency change speed of the set compressor, and the compressor is controlled to continue to perform frequency conversion operation according to a set control strategy so as to meet the requirement of adjusting the load of an air-conditioning room.
If the second pressure ratio belongs to a second set pressure ratio interval, the system pressure ratio is stable and maintained at a reasonable level after the compressor is started to operate for a period of time, and if the frequency is continuously increased, a working condition that the system pressure ratio is too high may occur, namely, the compressor is controlled not to be operated in an increasing frequency mode, namely, the frequency conversion speed of the calibrated compressor obtained in the step is equal to 0, the frequency of the compressor is not increased any more, the compressor is controlled to keep the current operation frequency unchanged, and the compressor is operated at a fixed frequency so as to avoid the system pressure ratio from being continuously increased.
If the second pressure ratio belongs to a third set pressure ratio interval, which indicates that the system pressure ratio is at a higher level after the start-up operation is performed for a period of time, the valve may not be opened, that is, the set compressor frequency change speed is calibrated to the set frequency reduction speed, and the compressor is controlled to perform frequency reduction operation to reduce the system pressure ratio.
In the above step, the down-conversion speed is determined according to the magnitude of the pressure ratio increase of the system:
if the first pressure ratio belongs to a first set pressure ratio interval in the first set period, if a second pressure ratio further belongs to a third set pressure ratio interval, which indicates that the system pressure ratio rapidly rises after the compressor is started to operate for a period of time and the risk of system failure is high, the set compressor frequency change speed, namely the first frequency increasing speed, is calibrated to the first set frequency reducing speed, namely the frequency increasing operation is not executed but the rapid frequency reducing operation is executed at the end of the second set period, the use requirement of the air conditioner is sacrificed, and the system safety is preferentially ensured.
If the first pressure ratio belongs to the second set pressure ratio interval in the first set period, if the second pressure ratio further belongs to the third set pressure ratio interval, the system pressure ratio is larger when the air conditioner is started, the system pressure ratio is not increased violently, the set compressor frequency change speed, namely the second frequency increasing speed, is calibrated to the second set frequency reducing speed, namely the frequency increasing operation is not executed but the slow frequency reducing operation is executed at the end of the second set period, so that the system safety is guaranteed preferentially, and the use requirements of the air conditioner are met.
If the first pressure ratio belongs to a third set pressure ratio interval in the first set period, if a second pressure ratio is further obtained and belongs to the third set pressure ratio interval, the fact that the system pressure ratio is not obviously increased but maintains a stable high pressure ratio working condition in a period of time after the compressor is started is shown, the set compressor frequency change speed, namely the third frequency increasing speed, is calibrated to a third set frequency reducing speed, namely, when the second set period is ended, the frequency increasing operation is not executed, but the slow frequency reducing operation is executed, so that the system safety is preferentially ensured, and meanwhile, the air conditioner use requirement is still considered under the condition of the high pressure ratio.
Preferably, the absolute value of the first set down-conversion speed is greater than the absolute value of the second set down-conversion speed, and the absolute value of the second set down-conversion speed is greater than or equal to the absolute value of the third set down-conversion speed. The first set down-conversion speed may be set to-2 Hz/s, the second set down-conversion speed may be set to-1 Hz/s, and the third set down-conversion speed may be set to-1 Hz/2 s. It is also possible to set both the second set down-conversion speed and the third set down-conversion speed to-1 Hz/2 s.
In the control process, the compressor frequency change speed is subjected to preposed intervention, so that the operation condition with higher risk is avoided. In practice, however, more extreme operating conditions exist. Therefore, in particular, after the first pressure ratio is calculated, it is first determined whether the first pressure ratio belongs to the guard pressure ratio range. If the first pressure ratio falls within the protection pressure ratio interval, the compressor is directly controlled to shutdown and the speed of the compressor frequency change is stopped from being set according to the second pressure ratio calibration. The protection pressure ratio interval is continuous with the third set pressure ratio interval, and the lower threshold of the protection pressure ratio interval is larger than the upper threshold of the third set pressure ratio. The lower threshold of the guard pressure ratio interval may be set to be greater than 9.
And (3) stopping calibrating and setting the frequency change speed of the compressor according to the second pressure ratio, simultaneously keeping the monitoring of the second pressure ratio by the system, if the second pressure ratio belongs to the first set pressure ratio interval, indicating that the shutdown of the compressor obviously reduces the system pressure ratio, and controlling the shutdown of the compressor without intervention on hardware, and simultaneously keeping the closing of the pressure release valve EEV. Therefore, if the first pressure ratio exceeds the lower limit threshold of the protection set pressure ratio setting interval in a short time due to severe load change, the normal continuous operation state under the load elimination condition can be ensured when the air conditioner is started again without extra waiting time while timely intervention is carried out. And if the second pressure ratio does not belong to the first set pressure ratio interval, controlling the compressor to stop and simultaneously controlling the pressure release valve EEV to open, and regulating the system pressure ratio by using the pressure release valve EEV.
Similarly, after the second pressure ratio is calculated, it is also first determined whether the second pressure ratio falls within the guard pressure ratio interval. And if the second pressure ratio belongs to the protection pressure ratio interval, controlling the compressor to stop. And if the first pressure ratio and the second pressure ratio are both in the protective pressure ratio interval, controlling the compressor to stop and simultaneously controlling the pressure release valve EEV to open, and regulating the system pressure ratio by using the pressure release valve EEV.
One selectable value for the first pressure ratio, the second pressure ratio, the calibrated compressor inverter speed, and the operating state of the pressure relief valve EEV is shown in the following table, where K1 represents the first pressure ratio, K2 represents the second pressure ratio, and the first up-conversion speed V is shown in the table up1 Greater than a second up-conversion speed V up2 Second rate of increase V up2 Greater than or equal to the third up-conversion speed; first set down-conversion speed V down1 Greater than a second set down-conversion speed V down2 Second set down-conversion speed V down2 Greater than or equal to the third set frequency-reducing speed V down3 . That is, in two consecutive sampling periods, the system remains up-converted if the system pressure ratio falls within a lower range, remains unchanged if the system pressure ratio falls within a reasonable range, and remains down-converted if the system pressure ratio falls within a higher range. Therefore, the reasonable operation of the air conditioner is ensured, and meanwhile, the risk of the system is controlled at a reasonable level, for example, when the pressure of the system is higher, the condition that the compressor continues to operate at high frequency can not occur, so that the operation of the air conditioner is more reasonableAnd (4) safety.
It is understood that the unopened valve state is a failure of the air conditioner. The frequency occurring during actual production and use is relatively low, and therefore, for a general split type air conditioner, the control strategy has the highest priority to control the operating frequency of the compressor by reducing and eliminating the temperature difference between the ambient temperature of the air-conditioned room and the temperature set by the user as the control target of the control system. Preferably, in the process of performing frequency control with the temperature difference as the control target of the air conditioner, the pressure ratio is sampled according to a set sampling period, if the pressure ratio belongs to a protection pressure ratio interval, the shutdown protection of the compressor is firstly performed, then the control method described in the above embodiment is switched to determine the frequency change speed of the compressor, and the operation of the compressor is controlled according to the frequency change speed of the compressor.
The embodiment of the application also provides an air conditioner and a control method applying the air conditioner. The specific steps of the air conditioner control method are described in detail with reference to the detailed description of the above embodiments and the drawings in the specification. No further description is given here, and the air conditioner adopting the air conditioner control method can achieve the same technical effects.
Embodiments of the present application also provide a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program causes an air conditioner to perform part or all of the steps of any one of the methods described in the above method embodiments.
In the foregoing embodiments, the descriptions of the respective embodiments have their respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the above-described units or modules is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be an indirect coupling or communication connection through some interfaces, devices or units, and may be an electrical or other form.
The units described as the separate components may or may not be physically separate, and the components displayed as the units may or may not be physical units, that is, may be located in one physical space, or may also be distributed on a plurality of network units, and some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for some of the features thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. An air conditioner control method is characterized by comprising the following steps:
the air conditioner is started, and in a first set period:
sampling a first high-pressure detection value of a compressor exhaust end;
sampling a first low-pressure detection value of an air return end of a compressor;
calculating a first pressure ratio that is a ratio of the first high pressure detection value and the first low pressure detection value;
in a second setting period consecutive to the first setting period:
sampling a second high-pressure detection value of the exhaust end of the compressor;
sampling a second low-pressure detection value of the air return end of the compressor;
calculating a second pressure ratio that is a ratio of the second high pressure detection value and the second low pressure detection value;
after the first pressure ratio is obtained, calling a corresponding set compressor frequency change speed according to the first pressure ratio;
after the second pressure ratio is obtained, calibrating the set compressor frequency change speed according to the second pressure ratio to obtain a calibrated compressor variable frequency speed;
and controlling the compressor to operate according to the variable frequency speed of the calibrated compressor.
2. The air conditioner control method according to claim 1, characterized in that:
invoking a corresponding set compressor frequency change speed based on the first pressure ratio comprises the steps of:
setting the frequency variation speed of the compressor to be a first frequency increasing speed if the first pressure ratio belongs to a first set pressure ratio interval;
if the first pressure ratio belongs to a second set pressure ratio interval, setting the frequency change speed of the compressor as a second frequency increasing speed;
setting the frequency variation speed of the compressor to be a third frequency increasing speed if the first pressure ratio belongs to a third set pressure ratio interval;
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 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 is increased in sequence.
3. The air conditioner control method according to claim 2, characterized in that:
calibrating the set compressor frequency variation speed according to the second pressure ratio to obtain a calibrated compressor variable frequency speed, comprising the following steps:
if the second pressure ratio belongs to a first set pressure ratio interval, keeping the frequency change speed of the set compressor unchanged, and controlling the frequency rising operation of the compressor when the frequency conversion speed of the calibrated compressor is equal to the frequency change speed of the set compressor;
if the second pressure ratio belongs to a second set pressure ratio interval, controlling the compressor to keep the current operation frequency unchanged and operate at a fixed frequency;
and if the second pressure ratio belongs to a third set pressure ratio interval, calibrating the set compressor frequency change speed to a set frequency reduction speed, and controlling the compressor to perform frequency reduction operation.
4. The air conditioner control method according to claim 3, characterized in that:
the method for calibrating the set compressor frequency change speed to the set frequency reduction speed comprises the following steps:
calibrating the set compressor frequency variation speed to a first set down-conversion speed if the first pressure ratio belongs to a first set pressure ratio interval within a first set period;
calibrating the set compressor frequency variation speed to a second set down-conversion speed if the first pressure ratio belongs to a second set pressure ratio interval within a first set period;
calibrating the set compressor frequency variation speed to a third set down-conversion speed if the first pressure ratio belongs to a third set pressure ratio interval within a first set period;
the absolute value of the first set frequency-reducing speed is greater than the absolute value of the second set frequency-reducing speed, and the absolute value of the second set frequency-reducing speed is greater than or equal to the absolute value of the third set frequency-reducing speed.
5. The air conditioner control method according to claim 4, wherein:
further comprising the steps of:
after the first pressure ratio is calculated, firstly, judging whether the first pressure ratio belongs to a protection pressure ratio interval, if the first pressure ratio belongs to the protection pressure ratio interval, controlling the compressor to stop and stopping calibrating the set compressor frequency change speed according to the second pressure ratio;
wherein the protection pressure ratio interval is contiguous with the third set pressure ratio interval, and a lower threshold of the protection pressure ratio interval is greater than an upper threshold of the third set pressure ratio.
6. The air conditioner control method according to claim 5, characterized in that:
further comprising the steps of:
further determining if the second pressure ratio falls within a first set pressure ratio interval if the first pressure ratio falls within a guard pressure ratio interval;
if the second pressure ratio belongs to a first set pressure ratio interval, controlling the compressor to stop and simultaneously keeping the pressure release valve closed;
a first end of the pressure relief valve is communicated with a first refrigerant passage, and a second end of the pressure relief valve is communicated with a second refrigerant 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, and a stop valve is arranged on the first refrigerant passage and/or the second refrigerant passage.
7. The air conditioner control method according to claim 1, characterized in that:
further comprising the steps of:
after the second pressure ratio is calculated, whether the second pressure ratio belongs to a protection pressure ratio interval or not is firstly determined, and if the second pressure ratio belongs to the protection pressure ratio interval, the compressor is controlled to stop.
8. The air conditioner control method according to claim 7, characterized in that:
further comprising the steps of:
if the first pressure ratio and the second pressure ratio are both in the protection pressure ratio interval, controlling the compressor to stop and controlling the pressure relief valve to open;
the first end of the pressure relief valve is communicated with a first refrigerant passage, the second end of the pressure relief valve is communicated with a second refrigerant 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, and the first refrigerant passage and/or the second refrigerant passage are/is provided with stop valves.
9. An air conditioner characterized by employing the air conditioner control method as claimed in any one of claims 1 to 8.
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| CN202010219046.8A CN113446706B (en) | 2020-03-25 | 2020-03-25 | Air conditioner control method and air conditioner |
| PCT/CN2021/073902 WO2021190121A1 (en) | 2020-03-25 | 2021-01-27 | Control method for air conditioner and air conditioner |
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| CN114738978B (en) * | 2022-03-30 | 2024-04-23 | 北京小米移动软件有限公司 | Air conditioner compressor operation frequency control method, device and storage medium |
| CN114857663A (en) * | 2022-05-12 | 2022-08-05 | 青岛海信日立空调系统有限公司 | Air conditioning system and control method thereof |
| CN115247859B (en) * | 2022-06-30 | 2023-10-27 | 海信空调有限公司 | Air conditioner |
| WO2024077989A1 (en) * | 2022-10-12 | 2024-04-18 | 青岛海信日立空调系统有限公司 | Air conditioner and control method therefor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04273949A (en) * | 1991-02-28 | 1992-09-30 | Toshiba Corp | Refrigerating cycle device |
| CN105180279A (en) * | 2015-09-02 | 2015-12-23 | 广东美的制冷设备有限公司 | Split floor type air conditioner, anti-explosion control method and anti-explosion control device |
| CN108954669A (en) * | 2018-07-06 | 2018-12-07 | 广东美的暖通设备有限公司 | Detection method, heating-cooling equipment and the readable storage medium storing program for executing of four-way valve failure |
| CN109210687A (en) * | 2018-09-21 | 2019-01-15 | 宁波奥克斯电气股份有限公司 | A kind of control method of air-conditioning system |
| JP2019085905A (en) * | 2017-11-06 | 2019-06-06 | 本田技研工業株式会社 | Control device of internal combustion engine |
| CN110057060A (en) * | 2019-03-19 | 2019-07-26 | 青岛海尔空调器有限总公司 | The control method and air conditioner that frequency for compressor of air conditioner is adjusted |
| CN110631234A (en) * | 2019-09-30 | 2019-12-31 | 广东美的暖通设备有限公司 | Control method of air conditioner operation frequency, air conditioner and computer readable storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1988345A4 (en) * | 2006-01-20 | 2016-10-26 | Sanyo Electric Co | Air conditioner |
| CN101614432B (en) * | 2008-06-24 | 2012-07-25 | 海尔集团公司 | Method and system for controlling frequency switch of multi-connected air conditioner |
| CN202126056U (en) * | 2011-07-14 | 2012-01-25 | Tcl空调器(中山)有限公司 | Variable-frequency air conditioner |
| JP6495064B2 (en) * | 2015-03-26 | 2019-04-03 | 三菱重工サーマルシステムズ株式会社 | Air conditioning system control device, air conditioning system, air conditioning system control program, and air conditioning system control method |
| CN110360734B (en) * | 2018-04-09 | 2020-10-27 | 珠海格力电器股份有限公司 | Air conditioner starting control method and device, storage medium and air conditioner |
-
2020
- 2020-03-25 CN CN202010219046.8A patent/CN113446706B/en active Active
-
2021
- 2021-01-27 WO PCT/CN2021/073902 patent/WO2021190121A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04273949A (en) * | 1991-02-28 | 1992-09-30 | Toshiba Corp | Refrigerating cycle device |
| CN105180279A (en) * | 2015-09-02 | 2015-12-23 | 广东美的制冷设备有限公司 | Split floor type air conditioner, anti-explosion control method and anti-explosion control device |
| JP2019085905A (en) * | 2017-11-06 | 2019-06-06 | 本田技研工業株式会社 | Control device of internal combustion engine |
| CN108954669A (en) * | 2018-07-06 | 2018-12-07 | 广东美的暖通设备有限公司 | Detection method, heating-cooling equipment and the readable storage medium storing program for executing of four-way valve failure |
| CN109210687A (en) * | 2018-09-21 | 2019-01-15 | 宁波奥克斯电气股份有限公司 | A kind of control method of air-conditioning system |
| CN110057060A (en) * | 2019-03-19 | 2019-07-26 | 青岛海尔空调器有限总公司 | The control method and air conditioner that frequency for compressor of air conditioner is adjusted |
| CN110631234A (en) * | 2019-09-30 | 2019-12-31 | 广东美的暖通设备有限公司 | Control method of air conditioner operation frequency, air conditioner and computer readable storage medium |
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