CN116717840A - Air conditioning system and control method thereof - Google Patents

Air conditioning system and control method thereof Download PDF

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Publication number
CN116717840A
CN116717840A CN202310735549.4A CN202310735549A CN116717840A CN 116717840 A CN116717840 A CN 116717840A CN 202310735549 A CN202310735549 A CN 202310735549A CN 116717840 A CN116717840 A CN 116717840A
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CN
China
Prior art keywords
compressor
current
preset
time
value
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Pending
Application number
CN202310735549.4A
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Chinese (zh)
Inventor
丁善达
王锡元
徐文学
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Application filed by Qingdao Hisense Hitachi Air Conditioning System Co Ltd filed Critical Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority to CN202310735549.4A priority Critical patent/CN116717840A/en
Publication of CN116717840A publication Critical patent/CN116717840A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The embodiment of the application provides an air conditioning system and a control method thereof, and relates to the technical field of air conditioning systems. The air conditioning system includes: an outdoor unit, a controller and at least one indoor unit, the outdoor unit comprising: a compressor and a current sensor connected to the compressor; the controller is configured to: acquiring an operating frequency of the compressor in response to the compressor start; counting the operation time of the operation frequency outside the rated frequency interval; after the running time is longer than the first preset time, reading a first current value which is detected by a current sensor and flows through the compressor every preset time period; determining an operating state of the compressor according to the operating time and the first current value; and when the compressor is in an oil-deficient running state, controlling oil return of the compressor. The air conditioning system provided by the embodiment of the application can accurately determine the running state of the compressor; when the compressor is in an oil-deficient running state, oil return of the compressor can be timely controlled, and normal running of the compressor is prevented from being influenced.

Description

Air conditioning system and control method thereof
Technical Field
The application relates to the technical field of air conditioning systems, in particular to an air conditioning system and a control method thereof.
Background
The compressor is a core component of the air conditioning system, and the working performance of the compressor directly influences the operation effect of the air conditioning system. Inside the compressor, lubricating oil for lubrication is generally required to be injected, so that friction force between parts inside the compressor is reduced, movement among the parts is smoother, and abrasion of the parts is reduced. In the running process of the compressor, the lubricating oil in the compressor can be discharged out of the compressor along with the refrigerant and enter the system condenser, the piping or the evaporator, and the dynamic balance of the lubricating oil in the compressor can be maintained only if the discharged lubricating oil can be smoothly brought back into the compressor. If the oil return of the compressor is insufficient, the compressor can be worn, and the service life of the compressor is influenced.
In the prior art, oil return is generally controlled according to the operation time of the compressor, for example, the compressor is controlled to return oil every 8 hours when the compressor is operated. However, the oil return control method in the prior art cannot control oil return according to the actual running condition of the compressor, and the compressor is likely to run in a long-time oil shortage state when reaching a specific time; and the compressor is not starved of oil when the oil return condition is met, so that misjudgment is caused, and the normal operation of the compressor is affected.
Disclosure of Invention
The embodiment of the application provides an air conditioning system and a control method thereof, which are used for judging the running state of a compressor according to running frequency and a first current value, so as to avoid the influence of oil shortage of the compressor on the normal running of the air conditioning system.
In a first aspect, an embodiment of the present application provides an air conditioning system, including: an outdoor unit, a controller and at least one indoor unit; the outdoor unit includes: a compressor and a current sensor connected to the compressor; the controller is configured to: acquiring an operating frequency of the compressor in response to the compressor start; counting the operation time of the operation frequency outside the rated frequency interval; after the running time is longer than the first preset time, reading a first current value which is detected by a current sensor and flows through the compressor every preset time period; determining an operating state of the compressor according to the operating time and the first current value; and when the compressor is in an oil-deficient running state, controlling the compressor to start oil return.
The air conditioning system provided by the embodiment of the application can judge the running state of the compressor according to the running frequency and the first current value of the compressor. Because the operating frequency of the compressor is related to the oil return amount of the compressor, and when the compressor lacks oil, lubrication among parts in the compressor is lacking, and the first current value flowing through the compressor also changes. In the scheme disclosed by the application, the controller can determine the running state of the compressor according to the running frequency of the compressor and the first current value flowing through the compressor, and once the compressor is in the oil-shortage running state, the controller can trigger the compressor to return oil, so that the compressor is prevented from being in the oil-shortage running state for a long time and the running effect of an air conditioning system is prevented from being influenced.
With reference to the first implementation manner of the first aspect, determining an operation state of the compressor according to the operation time and the first current value includes: determining a second current value based on a discharge pressure of the compressor and a suction pressure of the compressor; determining a difference between the first current value and the second current value as a first current deviation value; generating a current deviation change rate, wherein the current deviation change rate is a difference value between the first current deviation value and the second current deviation value; the second current deviation value is related to the current flowing through the compressor before the first current value is read; and if the preset condition is met, determining that the compressor is in an oil-deficient running state, wherein the preset condition is related to at least one of a first current deviation value, a current deviation change rate and running time.
With reference to the second implementation manner of the first aspect, the preset condition includes: at least one of the time when the current deviation change rate is greater than the preset threshold exceeds the second preset time, the first current deviation value is greater than the first preset deviation value, and the running time is greater than the third preset time.
With reference to the third implementation manner of the first aspect, after the step of controlling oil return of the compressor, the method further includes: counting the oil return time of the compressor; and when the oil return time reaches a fourth preset time, controlling the compressor to stop oil return.
With reference to the fourth implementation manner of the first aspect, after the step of controlling oil return of the compressor, the controller is further configured to: counting the time when the first current deviation value is smaller than a second preset deviation value, wherein the second preset deviation value is smaller than the first preset deviation value; and when the time that the first current deviation value is smaller than the second preset deviation value reaches the fifth preset time, controlling the compressor to stop oil return.
With reference to the fifth implementation manner of the first aspect, the step of controlling oil return of the compressor specifically includes: the compressor is controlled to operate at a preset frequency, and the preset frequency is within a rated frequency interval.
In a second aspect, an embodiment of the present application provides a control method of an air conditioning system, where the control method includes: acquiring an operating frequency of the compressor in response to the compressor start; counting the operation time of the operation frequency outside the rated frequency interval; after the running time is longer than the first preset time, acquiring a first current value flowing through the compressor every preset time period; determining an operating state of the compressor according to the operating time and the first current value; and when the compressor is in an oil-deficient running state, controlling the compressor to start oil return.
With reference to the first implementation manner of the second aspect, determining an operation state of the compressor according to the operation time and the first current value includes: determining a second current value based on a discharge pressure of the compressor and a suction pressure of the compressor; determining a difference between the first current value and the second current value as a first current deviation value; generating a current deviation change rate, wherein the current deviation change rate is a difference value between the first current deviation value and the second current deviation value; the second current deviation value is related to the current flowing through the compressor before the first current value is read; and if the preset condition is met, determining that the compressor is in an oil-deficient running state, wherein the preset condition is related to at least one of a first current deviation value, a current deviation change rate and running time.
With reference to the second implementation manner of the second aspect, the preset condition includes: at least one of the time when the current deviation change rate is greater than the preset threshold exceeds the second preset time, the first current deviation value is greater than the first preset deviation value, and the running time is greater than the third preset time.
With reference to the third implementation manner of the second aspect, after the step of controlling oil return of the compressor, the method further includes: counting the oil return time of the compressor; and when the oil return time reaches a fourth preset time, controlling the compressor to stop oil return.
With reference to the fourth implementation manner of the second aspect, after the step of controlling oil return of the compressor, the control method further includes: counting the time when the first current deviation value is smaller than a second preset deviation value, wherein the second preset deviation value is smaller than the first preset deviation value; and when the time that the first current deviation value is smaller than the second preset deviation value reaches the fifth preset time, controlling the compressor to stop oil return.
In a third aspect, an embodiment of the present application provides a controller, including: one or more processors; one or more memories; wherein the one or more memories are configured to store computer program code comprising computer instructions that, when executed by the one or more processors, cause the controller to perform any of the control methods provided in the second aspect and possible implementations.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium comprising computer instructions which, when controlled on a computer, cause the computer to perform any of the control methods provided in the second aspect and in possible implementations.
In a fifth aspect, embodiments of the present application provide a computer program product directly loadable into a memory and comprising software code, when loaded and executed via a computer, enabling the implementation of any of the control methods as provided in the second aspect and in any of the possible implementations.
It should be noted that the above-mentioned computer instructions may be stored in whole or in part on a computer-readable storage medium. The computer readable storage medium may be packaged together with the processor of the controller or may be packaged separately from the processor of the controller, which is not limited in the present application.
The advantageous effects described in the second to fifth aspects of the present application may be referred to for the advantageous effect analysis of the first aspect, and will not be described here again.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
Fig. 1 is a schematic diagram of an air conditioning system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an installation position of a current sensor according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a current transformer according to an embodiment of the present application;
fig. 4 is a control flow chart of a controller of an air conditioning system according to an embodiment of the present application;
fig. 5 is a second control flow chart of a controller of an air conditioning system according to an embodiment of the present application;
fig. 6 is a control flow chart III of a controller of an air conditioning system according to an embodiment of the present application;
fig. 7 is a control flow chart of a controller of an air conditioning system according to an embodiment of the present application;
fig. 8 is a control flow chart of a controller of an air conditioning system according to an embodiment of the present application;
fig. 9 is a control flow chart sixth of a controller of an air conditioning system according to an embodiment of the present application;
fig. 10 is a control flow chart seventh of a controller of an air conditioning system according to an embodiment of the present application;
Fig. 11 is a schematic control flow diagram of an air conditioning system according to an embodiment of the present application;
fig. 12 is a flowchart of a method for controlling an air conditioning system according to an embodiment of the present application;
fig. 13 is a second flowchart of a method for controlling an air conditioning system according to an embodiment of the present application;
fig. 14 is a flowchart of a method for controlling an air conditioning system according to an embodiment of the present application;
fig. 15 is a flowchart of a method for controlling an air conditioning system according to an embodiment of the present application;
fig. 16 is a flowchart of a method for controlling an air conditioning system according to an embodiment of the present application;
fig. 17 is a schematic structural diagram of a control device according to an embodiment of the present application;
fig. 18 is a schematic diagram of a hardware architecture of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that the terms "first," "second," and "second," as used in embodiments of the present application, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. In addition, when describing a pipeline, the terms "connected" and "connected" as used herein have the meaning of conducting. The specific meaning is to be understood in conjunction with the context.
In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioning system according to a possible embodiment.
As shown in fig. 1, the air conditioning system may include: an outdoor unit 10, a controller (not shown in fig. 1), and an indoor unit 20. The outdoor unit 10 and the indoor unit 20 may be connected by a pipe or the like.
The outdoor unit 10 includes: a compressor 11, a four-way reversing valve 12, an outdoor heat exchanger 13, an outdoor fan 14, an outdoor electronic expansion valve 15, a liquid side stop valve 16, a gas side stop valve 17 and a gas-liquid separator 18. The indoor unit 20 includes: an indoor unit electronic expansion valve 21, an indoor unit heat exchanger 22 and an indoor fan 23.
It should be noted that fig. 1 is only an exemplary illustration of a case where the air conditioning system includes one indoor unit, and in a practical application process, the number of indoor units included in the air conditioning system is not specifically limited in the embodiment of the present application.
In some embodiments, the compressor 11 is disposed between the four-way reversing valve 12 and the gas-liquid separator 18, and is configured to compress the refrigerant, and input the compressed refrigerant into the circulation system through the four-way reversing valve 12, so as to power the circulation of the refrigerant.
In some embodiments, four ports (C, D, S, E) of the four-way reversing valve 12 are respectively connected to an exhaust port (not shown) of the compressor 11, the outdoor heat exchanger 13, the gas-liquid separator 18, and the indoor heat exchangers 22 of the respective indoor units.
The four-way reversing valve 12 is used for realizing the mutual conversion of the air conditioning system between a refrigerating mode and a heating mode by changing the flow direction of the refrigerant in the system pipeline.
In some embodiments, the outdoor heat exchanger 13 is connected to the compressor 11 at one end thereof through the four-way reversing valve 12, and connected to the indoor heat exchanger 22 at the other end thereof. The outdoor heat exchanger 13 is used for performing heat exchange between the refrigerant flowing in the heat transfer tube of the outdoor heat exchanger 13 and the outdoor air, so as to achieve the purpose of adjusting the temperature.
In some embodiments, the outdoor fan 14 is connected to an outdoor fan (not shown) for driving or changing the rotation speed of the outdoor fan, so as to promote the heat exchange between the refrigerant flowing in the heat transfer tube of the outdoor heat exchanger 13 and the outdoor air, thereby achieving the purpose of assisting in temperature regulation.
In some embodiments, the outdoor unit electronic expansion valve 15 and the indoor unit electronic expansion valve 21 are disposed between the indoor unit heat exchanger 22 and the outdoor unit heat exchanger 13. The outdoor unit electronic expansion valve 15 has a function of expanding and decompressing the refrigerant flowing through the outdoor unit electronic expansion valve 15, and can be used for adjusting the flow rate of the refrigerant in the pipe. The indoor unit electronic expansion valve 21 has a function of expanding and decompressing the refrigerant flowing through the outdoor unit electronic expansion valve 21, and can be used for adjusting the flow rate of the refrigerant in the pipeline.
In some embodiments, the liquid-side shutoff valve 16 is disposed between the outdoor unit electronic expansion valve 15 and the indoor unit electronic expansion valve 21.
In some embodiments, the air side shut-off valve 17 is disposed between the compressor 11 and the indoor heat exchanger 22.
In some embodiments, a gas-liquid separator 18 is coupled to the compressor 11 for separating the gaseous refrigerant from the liquid refrigerant.
In some embodiments, the indoor heat exchanger 22 is configured to exchange heat between the refrigerant flowing in the heat transfer tube of the indoor heat exchanger 22 and the indoor air.
In some embodiments, the indoor fan 23 is connected to an indoor fan (not shown) for driving or varying the rotational speed of the indoor fan to promote heat exchange between the refrigerant flowing in the heat transfer pipe of the indoor unit heat exchanger 22 and the indoor air.
The controller is a control center of the air conditioning system 100 and may be used to control operations of various components of the air conditioning system 100 such that the various components of the air conditioning system 100 operate to perform various functions of the air conditioning system 100.
In some embodiments, the controller refers to a device that can generate an operation control signal according to a command operation code and a timing signal, and instruct the outdoor unit 10 and the indoor unit 20 to perform a control command. By way of example, the controller may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The controller may also be any other device having processing functionality, such as a circuit, device or software module, for which embodiments of the application are not limited in any way.
It will be appreciated by those skilled in the art that the hardware configuration shown in fig. 1 does not constitute a limitation of the air conditioning system, which may include more or fewer components than shown, or may combine certain components, or a different arrangement of components, as the application is not specifically limited in this regard.
As described in the background art, a compressor is a core component of an air conditioning system, and its operation performance directly affects the operation effect of the air conditioning system. In actual operation, the compressor may be in oil shortage operation due to the difference of the operation frequencies, when the compressor is operated at high frequency for a long time, the oil discharge amount of the compressor may be increased, the oil return amount may not be changed at the moment, and the lubricating oil in the oil pool of the compressor may be gradually reduced after the compressor is operated for a long time; when the compressor is operated at a low frequency, the suction amount of the compressor is reduced, which may lead to a reduction in the oil return amount of the compressor, and if the compressor is operated for a long period of time, the amount of oil in the oil sump of the compressor may be reduced.
When the compressor is operated at a rated frequency, the oil return amount and the oil discharge amount of the compressor are gradually balanced, and the oil remaining in the air conditioning system can be returned to the compressor oil pool. The existing control method cannot accurately judge whether the compressor is short of oil. It is possible that the compressor has been operated for a long time without oil when a certain time is reached; and when the oil return condition is met, the compressor is not short of oil, so that misjudgment is caused, the load output of the unit is influenced, and the use effect of a user is influenced.
Based on this, the outdoor unit 10 of the air conditioning system according to the embodiment of the present application further includes a current sensor for detecting a current value flowing through the compressor. Referring to fig. 2, fig. 2 is a schematic diagram illustrating an installation position of a current sensor according to an embodiment of the application. As shown in fig. 2, the current sensor 19 is provided on the wire harness 110 of the compressor 10.
As a possible implementation, the current sensor 19 may be a current transformer. The current transformer consists of a closed iron core and windings. Referring to fig. 3, fig. 3 is a schematic structural diagram of a current transformer according to an embodiment of the application. It can be seen that a current transformer can be strung in the line of the current to be measured, thereby measuring the value of the current flowing through the line.
Referring to fig. 4, in order to enable normal operation of the air conditioning system provided by the embodiment of the present application, the controller is configured to perform S401-S405:
s401, responding to the start of the compressor, and acquiring the operation frequency of the compressor.
S402, counting the operation time of the operation frequency outside the rated frequency interval.
When the compressor is operated at high frequency, namely the operating frequency is higher than the upper limit of the rated frequency interval, the oil discharge amount of the compressor can be increased, the oil return amount can be unchanged at the moment, and the lubricating oil in the oil pool of the compressor can be gradually reduced after the compressor is operated for a long time; when the compressor is operated at a low frequency, i.e. the operating frequency is below the lower limit of the nominal frequency interval, a reduced suction of the compressor may result in a reduced return oil of the compressor and, if operated for a long period of time, in a reduced oil volume in the oil sump of the compressor.
In summary, the operating frequency of the compressor is outside the rated frequency range, which may result in a decrease in the oil amount in the oil sump of the compressor after long-term operation, that is, the compressor is starved of oil, and oil needs to be returned.
It should be understood that, in the embodiment of the present application, the rated frequency interval is preset by the system, and in the practical application process, the rated frequency interval may be set according to the characteristics of the compressor itself.
S403, after the running time is longer than the first preset time, reading a first current value which is detected by the current sensor and flows through the compressor every preset time period.
It should be understood that, in the embodiment of the present application, the first preset time and the preset time period are preset by the system, and in the actual application process, the first preset time and the preset time period may be set according to the needs. For example, as a feasible implementation, the first preset time may be 5 minutes, the preset time period may be 1 minute, and after the operating frequency of the compressor is 5 minutes outside the rated frequency interval, the first current value detected by the current sensor is read every 1 minute.
Because the operating frequency of the compressor is outside the rated frequency interval, the oil quantity in the oil pool of the compressor is possibly reduced after long-time operation, and in order to further judge whether the compressor is in an oil shortage state, a first current value is obtained every preset time period, and whether the compressor is in the oil shortage operating state is further judged according to the first current value flowing through the compressor.
S404, determining the operation state of the compressor according to the operation time and the first current value.
The oil return state of the compressor can be indicated due to the rising and falling trend of the first current value of the compressor. When the compressor returns oil normally, the load of the compressor is increased, and the first current value has an increasing trend; in the case where the compressor oil return is insufficient, the load of the compressor decreases, and the first current value has a tendency to decrease.
Therefore, whether the compressor is in the oil-deficient operation state can be judged according to the operation time of the operation frequency of the compressor outside the rated frequency interval and the first current value flowing through the compressor.
As a feasibility implementation, referring to fig. 5, S404 may be implemented as S501-S504:
s501, obtaining the discharge pressure and the suction pressure of the compressor, and determining a second current value according to the discharge pressure and the suction pressure.
The correspondence between the discharge pressure and the suction pressure of the compressor and the second current value is stored in advance in the air conditioning system. As a possible implementation manner, a functional relationship among the first current value Icom of the compressor, the discharge pressure Pd, and the suction pressure Ps of the compressor may be fitted according to a performance curve of the compressor, as shown in formula (1):
Icom=F (Pd, ps) formula (1)
That is, the compressor is operated at rated power, and the discharge pressure Pd and the suction pressure Ps correspond to the first current value of the compressor.
As a feasible implementation, F (Pd, ps) may be a binary once equation, as shown in equation (2):
f (Pd, ps) =a+pd+b+ps+c formula (2)
As another possible implementation, F (Pd, ps) may be a binary quadratic equation, as shown in equation (3):
F(Pd，Ps)＝a* Pd 2 +b* Ps 2 +c Pd ps+d pd+e ps+f equation (3)
Wherein a, b, c, d, e is a constant.
After the exhaust pressure and the suction pressure of the compressor are obtained, the second current value of the compressor, namely the first current value when the compressor is in a normal running state, is determined according to the corresponding relation between the exhaust pressure and the suction pressure and the second current value.
It should be noted that the embodiments of the present application are merely exemplary of several implementations for determining the second current value, and the implementations are not limited in particular.
S502, determining a difference value between the first current value and the second current value as a first current deviation value.
And calculating a difference value between the first current value and the second current value of the compressor, namely, a difference value between an actual current value and a theoretical current value of the compressor, and taking the difference value as a first current deviation value.
S503, generating a current deviation change rate.
The current deviation change rate is the difference between the first current deviation value and the second current deviation value.
Wherein the second current offset value is related to the current flowing through the compressor before the first current value is read.
In some embodiments, the second current deviation value is a current deviation value before the preset time period, that is, a current deviation value calculated last time.
If the current bias value of the compressor continues to increase, it indicates that the compressor is undergoing a gradual oil starvation process. Therefore, the difference between the first current deviation value and the second current deviation value is determined as the current deviation change rate, that is, the change value of the current deviation value.
S504, determining the operation state of the compressor according to the first current deviation value, the current deviation change rate and the operation time.
The first current deviation value represents the deviation condition of the actual current value and the theoretical current value of the compressor, the current deviation change rate is the change condition of the current deviation value of the compressor, and the operation frequency is an intuitive reaction of the operation state of the compressor, so that whether the compressor is in the oil-deficient operation state or not can be determined according to the first current deviation value, the current deviation change rate and the operation frequency, and the operation state of the compressor can be accurately judged.
As a feasibility implementation, S504 may be specifically implemented as: and if the preset condition is met, determining that the compressor is in an oil-deficient running state. The preset conditions comprise: at least one of the time when the current deviation change rate is greater than the preset threshold exceeds the second preset time, the first current deviation value is greater than the first preset deviation value, and the running time is greater than the third preset time.
As a feasibility implementation, referring to fig. 6, S504 may be implemented as follows:
s601, judging whether the current deviation change rate is larger than a preset threshold value.
If the current deviation change rate is greater than the preset threshold, S602 is performed; and if the current deviation change rate is smaller than or equal to a preset threshold value, indicating that the compressor is in a normal running state.
S602, counting time when the current deviation change rate is larger than a preset threshold value.
When the compressor lacks oil, the compressor moving parts lack lubrication and the first current value is gradually increased. So if the current deviation rate of change is greater than the preset threshold, i.e. the current deviation value of the compressor continues to increase, it indicates that the compressor is undergoing a gradual oil starvation process. The time when the current deviation change rate is greater than the preset threshold value, that is, the time when the current deviation value of the compressor is continuously increased, is counted.
S603, judging whether the time when the current deviation change rate is larger than a preset threshold exceeds a second preset time.
If yes, executing S604; if not, the compressor is in a normal running state.
S604, determining that the compressor is in an oil-starved operation state.
When the compressor lacks oil, the compressor moving parts lack lubrication and the first current value is gradually increased. So if the time that the current deviation change rate is greater than the preset threshold exceeds the second preset time, that is, the current deviation value of the compressor is continuously increased, it indicates that the compressor is undergoing a gradual oil starvation process. And if the continuously increased time exceeds the second preset time, namely, the time when the current deviation change rate is larger than the preset threshold exceeds the second preset time, indicating that the compressor is in an oil-deficient running state.
It should be understood that, in the embodiment of the present application, the preset threshold and the second preset time are preset by the system, and may be set according to the needs in the actual application process. For example, as one possible implementation, the preset threshold may be 0.5, the second preset time may be 2 minutes, and when the time that the current deviation change rate is greater than 0.5 exceeds 2 minutes, it is determined that the compressor is in the oil-starved operation state.
As another possible implementation, referring to fig. 7, S504 may be implemented as:
s701, judging whether the first current deviation value is larger than a first preset deviation value.
If yes, executing S702; if not, the compressor is in a normal running state.
S702, determining that the compressor is in an oil-starved running state.
Because the first current deviation value represents the deviation condition of the actual first current value and the theoretical first current value of the compressor, if the first current deviation value is larger than the first preset deviation value, the first current value of the compressor is larger, namely the compressor is in the oil-starved operation state.
It should be understood that, in the embodiment of the present application, the first preset deviation value is preset by the system, and in the actual application process, the first preset deviation value may be set according to the requirement. For example, as a feasible implementation, the first preset deviation value may be 1, and if the first current deviation value is greater than 1, it indicates that the compressor is in the oil-starved operation state.
As another possible implementation, referring to fig. 8, S504 may be implemented as:
s801, judging whether the running time is larger than a third preset time.
Wherein the third preset time is greater than the first preset time.
If the running time is greater than the third preset time, executing S802; if not, the compressor is in a normal running state.
S802, determining that the compressor is in an oil-starved running state.
Because the running time is the time that the running frequency of the compressor is outside the rated frequency interval, the compressor can possibly cause oil shortage when running outside the rated interval for a long time, and in order to avoid inaccurate detection of the first current value of the compressor, when the running time is longer than the third preset time, the compressor is determined to be in an oil shortage running state, and the stable running of the compressor can be further ensured.
It should be understood that, in the embodiment of the present application, the third preset time is preset by the system and is greater than the first preset time, and in the actual application process, the third preset time may be set according to the requirement. For example, as a feasible implementation manner, the third preset time may be 10 minutes, and after the operation frequency of the compressor is outside the rated frequency interval for 10 minutes, it is determined that the compressor is in the oil-deficient operation state.
And S405, when the compressor is in an oil-deficient running state, controlling the compressor to start oil return.
When the compressor is in the starved operation state, the lubrication oil in the compressor sump gradually decreases. Wear can occur among parts in the compressor, and the service life of the compressor is influenced. Therefore, when the compressor is in the oil-deficient running state, the compressor is controlled to start oil return. So that the discharged lubricating oil can be smoothly brought back into the compressor, and the dynamic balance of the lubricating oil in the compressor is maintained.
As a feasibility implementation, S405 may be specifically implemented as: the compressor is controlled to operate at a preset frequency.
It should be understood that the preset frequency is within the rated frequency interval, which is the optimal oil return frequency preset for the system.
Since the oil return amount and the oil discharge amount of the compressor are gradually balanced when the compressor is operated at a frequency within the rated frequency range, the lubricating oil remaining in the air conditioning system can be returned to the compressor oil sump. Therefore, the compressor is controlled to run at a preset frequency within a rated frequency interval, so that the discharged lubricating oil can be smoothly brought back into the compressor, and the dynamic balance of the lubricating oil in the compressor is maintained.
It can be seen that, in the air conditioning system provided by the embodiment of the application, the operation state of the compressor can be judged according to the operation frequency and the first current value of the compressor. Because the operating frequency of the compressor is related to the oil return amount and the oil discharge amount of the compressor, and when the compressor lacks oil, lubrication among all parts in the compressor is lacking, and the first current value also changes. Therefore, according to the operation frequency and the first current value, whether the compressor is in an oil-deficient operation state can be accurately judged, and further oil return of the compressor can be timely controlled, so that normal operation of the compressor is prevented from being influenced.
In some embodiments, after the compressor enters the oil return control mode to perform oil return, it needs to determine whether an oil return exit condition is satisfied, that is, whether the discharged lubricating oil is already brought back into the compressor, so as to avoid long-time oil return of the compressor, and influence the operation of the air conditioning system.
As a feasibility implementation, referring to fig. 9, after S405, the method provided by the embodiment of the present application further includes:
and S901, counting the oil return time of the compressor.
And S902, when the oil return time reaches a fourth preset time, controlling the compressor to stop oil return.
Since the compressor needs to operate at a rated frequency or change the opening of the electronic expansion valve during oil return, no matter what oil return scheme is adopted, the normal operation of the air conditioning system is affected, for example, the refrigerating capacity/heating capacity of the air conditioning system cannot reach the temperature required by a user. Therefore, the oil return time of the compressor needs to be counted, and when the oil return time reaches the fourth preset time, the compressor is controlled to stop oil return. The long-time oil return of the compressor is avoided, and the use effect of a user is influenced.
As another possible implementation manner, referring to fig. 10, after S405, the method provided by the embodiment of the present application further includes:
S1001, counting time when the first current deviation value is smaller than a second preset deviation value.
S1002, when the time that the first current deviation value is smaller than the second preset deviation value reaches the fifth preset time, controlling the compressor to stop oil return.
Because of the lack of lubrication between the parts inside the compressor when the compressor is starved of oil, the first current value will also vary. The first current deviation value can represent the deviation condition of the first current value and the second current value of the compressor, so that when the first current deviation value is smaller than a second preset deviation value, the compressor is gradually returned, and abrasion among parts in the compressor is reduced. And when the time that the first current deviation value is smaller than the second preset deviation value reaches the fifth preset time, indicating that the oil return of the compressor is finished, and controlling the compressor to stop oil return.
It should be understood that, in the embodiment of the present application, the second preset deviation value and the fifth preset time are preset by the system, and the second preset deviation value is smaller than the first preset deviation value. In the actual application process, the second preset deviation value and the fifth preset time can be set according to the requirement. For example, as a feasible implementation manner, the second preset deviation value may be 0.5, the fifth preset time may be 3 minutes, and when the time that the first current deviation value is less than 0.5 reaches 3 minutes, it indicates that the oil return of the compressor is finished, and the oil return of the compressor is controlled to stop.
In some embodiments, referring to fig. 11, after the compressor starts to operate, the controller is configured to perform the following steps:
s1101, counting the running time T1.
The operation time T1 is a time when the operation frequency of the compressor is outside the rated frequency interval.
S1102, judging whether T1 is larger than Tmin.
Wherein Tmin is a first preset time.
If yes, executing S1103; if not, it indicates that the compressor is in a normal operation state, and the process returns to S1101.
S1103, judging whether the preset condition is met.
The preset conditions comprise: current deviation change rate Icom of compressor 2 Whether the time greater than I1 exceeds T2, whether the first current deviation value Δicomt is greater than a first preset deviation value Imax, and whether the run time is greater than at least one of Tmax.
It should be understood that I1 is a preset threshold; t2 is a second preset time, and Tmax is a third preset time.
If the preset condition is satisfied, executing S1104; if not, the compressor is indicated to be in a normal running state, and the process returns to S1102.
S1104, controlling the compressor to operate at the rated frequency.
S1105, judging whether the oil return time is greater than T3 or whether the delta Icomt is smaller than a second preset deviation value Imin.
Wherein T3 is a fourth preset time.
If yes, executing S1106; if not, execution continues with S1104.
And S1106, controlling the compressor to stop oil return.
And when the oil return time is longer than the fourth preset time or the first current deviation value is shorter than the second preset deviation value, indicating that the oil return of the compressor is finished, and controlling the compressor to stop oil return.
The embodiment of the application also provides a control method of the air conditioning system, which comprises the following steps: an outdoor unit, a controller and at least one indoor unit, the outdoor unit comprising: a compressor and a current sensor connected to the compressor.
Referring to fig. 12, fig. 12 is a flowchart of a control method of an air conditioning system according to an embodiment of the present application. As shown in fig. 12, the control method includes the steps of:
s1201, in response to the start of the compressor, the operating frequency of the compressor is acquired.
S1202, counting the operation time of the operation frequency outside the rated frequency interval.
S1203, after the operation time is greater than the first preset time, obtaining a first current value flowing through the compressor every preset time period.
S1204, determining the operation state of the compressor according to the operation time and the first current value.
And S1205, controlling the compressor to start oil return when the compressor is in an oil-starved running state.
As a feasible implementation, referring to fig. 13, determining an operation state of the compressor according to the operation time and the first current value includes:
s1301, acquiring a discharge pressure and a suction pressure of the compressor, and determining a second current value according to the discharge pressure and the suction pressure.
S1302, determining a difference value between the first current value and the second current value as a first current deviation value.
S1303, a current deviation change rate is generated.
The current deviation change rate is the difference value between the first current deviation value and the second current deviation value; the second current deviation value is a current deviation value before a preset time period.
S1304, determining the operation state of the compressor according to the first current deviation value, the current deviation change rate and the operation time.
As a feasible implementation, determining an operation state of the compressor according to the first current deviation value, the current deviation change rate and the operation time includes: and if the preset condition is met, determining that the compressor is in an oil-deficient running state.
The preset conditions comprise: at least one of the time when the current deviation change rate is greater than the preset threshold exceeds the second preset time, the first current deviation value is greater than the first preset deviation value, and the running time is greater than the third preset time.
As a feasibility implementation, referring to fig. 14, S1304 may be implemented as:
s1401, judging whether the current deviation change rate is larger than a preset threshold value.
If the current deviation change rate is greater than the preset threshold, executing S1402; and if the current deviation change rate is smaller than or equal to a preset threshold value, indicating that the compressor is in a normal running state.
S1402, counting time when the current deviation change rate is larger than a preset threshold value.
When the compressor lacks oil, the compressor moving parts lack lubrication and the first current value is gradually increased. So if the current deviation rate of change is greater than the preset threshold, i.e. the current deviation value of the compressor continues to increase, it indicates that the compressor is undergoing a gradual oil starvation process. The time when the current deviation change rate is greater than the preset threshold value, that is, the time when the current deviation value of the compressor is continuously increased, is counted.
S1403, judging whether the current deviation change rate is larger than a preset threshold value and exceeds a second preset time.
If yes, executing S1404; if not, the compressor is in a normal running state.
S1404, determining that the compressor is in an oil-starved operation state.
As another feasibility implementation, S1304 may be specifically implemented as: and if the first current deviation value is larger than a first preset deviation value, determining that the compressor is in an oil-deficient running state.
As another feasibility implementation, S1304 may be specifically implemented as: and if the running time is longer than the third preset time, determining that the compressor is in an oil-deficient running state.
As a possible implementation manner, referring to fig. 15, after the step of controlling the compressor to enter the oil return control mode to perform oil return, the method further includes:
s1501, counting oil return time of the compressor.
And S1502, when the oil return time reaches a fourth preset time, controlling the compressor to stop oil return.
As a possible implementation manner, referring to fig. 16, after the step of controlling the compressor to enter the oil return control mode to perform oil return, the method further includes:
s1601, counting time when the first current deviation value is smaller than a second preset deviation value.
The second preset deviation value is smaller than the first preset deviation value.
And S1602, controlling the compressor to stop oil return when the time when the first current deviation value is smaller than the second preset deviation value reaches the fifth preset time.
As a feasibility implementation manner, the compressor is controlled to enter an oil return control mode to return oil, specifically: and controlling the compressor to operate at a preset frequency, wherein the preset frequency is in a rated frequency interval.
The embodiment of the present application further provides a control device for an air conditioning system, referring to fig. 17, the control device 1700 includes: an acquisition module 1701 for acquiring an operating frequency of the compressor; a statistics module 1702 configured to count an operation time when an operation frequency is outside a rated frequency interval; the obtaining module 1701 is further configured to obtain a first current value flowing through the compressor every predetermined time period after the running time is greater than the first predetermined time period; a determining module 1703 for determining an operating state of the compressor based on the operating time and the first current value; the control module 1704 is configured to control the compressor to start oil return when the compressor is in an oil-starved operation state.
The embodiment of the present application further provides an electronic device, referring to fig. 18, the electronic device 180 includes: one or more processors 1801; one or more memories 1802, wherein the one or more memories 1802 are configured to store computer program code, including computer instructions; the one or more processors 1801, when executing computer instructions, cause the electronic device 180 to perform the various steps of the methods shown in the method embodiments described above.
The embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores computer instructions which, when run on the electronic device, cause the electronic device to execute the steps executed by the electronic device in the method flow shown in the method embodiment.
The embodiment of the application also provides a computer program product, which comprises computer instructions, when the computer instructions are run on the electronic device, the electronic device is caused to execute the steps executed by the electronic device in the method flow shown in the embodiment of the method.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer-executable instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are fully or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by means of a wired (e.g., coaxial cable, optical fiber, digital subscriber line (digitalsubscriber line, DSL), or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by the computer or a data storage device containing one or more servers, data centers, etc., that can be integrated with the medium.
The present application is not limited to the above embodiments, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (10)

1. An air conditioning system, comprising: an outdoor unit, a controller and at least one indoor unit;
the outdoor unit includes: a compressor and a current sensor connected to the compressor;
the controller is configured to:
acquiring an operating frequency of the compressor in response to the compressor start;
counting the operation time of the operation frequency outside a rated frequency interval;
after the running time is longer than a first preset time, reading a first current value which is detected by the current sensor and flows through the compressor every preset time period;
determining an operating state of the compressor according to the operating time and the first current value;
and when the compressor is in an oil-deficient running state, controlling the compressor to start oil return.
2. The air conditioning system of claim 1, wherein said determining an operating state of said compressor based on said operating time and said first current value comprises:
Determining a second current value based on a discharge pressure of the compressor and a suction pressure of the compressor;
determining a difference between the first current value and the second current value as a first current offset value;
generating a current deviation change rate, wherein the current deviation change rate is a difference value between the first current deviation value and the second current deviation value; the second current offset value is related to the current flowing through the compressor before the first current value is read;
and if a preset condition is met, determining that the compressor is in an oil-deficient running state, wherein the preset condition is related to at least one of the first current deviation value, the current deviation change rate and the running time.
3. The air conditioning system according to claim 2, wherein the preset condition includes: at least one of the time when the current deviation change rate is greater than a preset threshold exceeds a second preset time, the first current deviation value is greater than a first preset deviation value, and the running time is greater than a third preset time.
4. The air conditioning system of claim 1, wherein after the step of controlling the compressor oil return, the controller is further configured to:
Counting the oil return time of the compressor;
and when the oil return time reaches a fourth preset time, controlling the compressor to stop oil return.
5. The air conditioning system of any of claims 2-4, wherein after the step of controlling the compressor oil return, the controller is further configured to:
counting the time when the first current deviation value is smaller than a second preset deviation value, wherein the second preset deviation value is smaller than the first preset deviation value;
and when the time that the first current deviation value is smaller than the second preset deviation value reaches a fifth preset time, controlling the compressor to stop oil return.
6. An air conditioning system according to any of claims 1-3, characterized in that the step of controlling the compressor oil return is in particular:
and controlling the compressor to operate at a preset frequency, wherein the preset frequency is in the rated frequency interval.
7. A control method of an air conditioning system, the air conditioning system comprising: an outdoor unit and at least one indoor unit;
the outdoor unit includes: a compressor and a current sensor connected to the compressor;
the control method comprises the following steps:
acquiring an operating frequency of the compressor in response to the compressor start;
Counting the operation time of the operation frequency outside a rated frequency interval;
after the running time is longer than a first preset time, acquiring a first current value flowing through the compressor every preset time period;
determining an operating state of the compressor according to the operating time and the first current value;
and when the compressor is in the oil-deficient running state, controlling the compressor to start oil return.
8. The control method according to claim 7, wherein the determining the operation state of the compressor according to the operation time and the first current value includes:
determining a second current value based on a discharge pressure of the compressor and a suction pressure of the compressor;
determining a difference between the first current value and the second current value as a first current offset value;
generating a current deviation change rate, wherein the current deviation change rate is a difference value between the first current deviation value and the second current deviation value; the second current offset value is related to the current flowing through the compressor before the first current value is read;
and if a preset condition is met, determining that the compressor is in an oil-deficient running state, wherein the preset condition is related to at least one of the first current deviation value, the current deviation change rate and the running time.
9. The control method according to claim 8, characterized in that the preset condition includes: at least one of the time when the current deviation change rate is greater than a preset threshold exceeds a second preset time, the first current deviation value is greater than a first preset deviation value, and the running time is greater than a third preset time.
10. The control method according to any one of claims 7 to 9, characterized in that after the step of controlling the compressor oil return, the control method further comprises:
counting the time when the first current deviation value is smaller than a second preset deviation value, wherein the second preset deviation value is smaller than the first preset deviation value;
and when the time that the first current deviation value is smaller than the second preset deviation value reaches a fifth preset time, controlling the compressor to stop oil return.
CN202310735549.4A 2023-06-20 2023-06-20 Air conditioning system and control method thereof Pending CN116717840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310735549.4A CN116717840A (en) 2023-06-20 2023-06-20 Air conditioning system and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310735549.4A CN116717840A (en) 2023-06-20 2023-06-20 Air conditioning system and control method thereof

Publications (1)

Publication Number Publication Date
CN116717840A true CN116717840A (en) 2023-09-08

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Country Link
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