CN113915737B - Air conditioner low-temperature heating starting control method and air conditioner - Google Patents
Air conditioner low-temperature heating starting control method and air conditioner Download PDFInfo
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- CN113915737B CN113915737B CN202111393338.4A CN202111393338A CN113915737B CN 113915737 B CN113915737 B CN 113915737B CN 202111393338 A CN202111393338 A CN 202111393338A CN 113915737 B CN113915737 B CN 113915737B
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—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
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
Abstract
The embodiment of the invention provides an air conditioner and a low-temperature heating starting control method thereof. The control method for low-temperature heating starting of the air conditioner comprises the following steps: after receiving a heating starting instruction, acquiring the outdoor environment temperature; when the outdoor environment temperature meets a preset temperature condition, controlling the compressor to heat at a starting frequency for a preset time; acquiring the exhaust superheat degree and the change rate of the exhaust superheat degree in real time; when the exhaust superheat degree and the exhaust superheat degree change rate meet preset conditions, controlling the air conditioner to be switched from heating operation to cooling operation; wherein the preset temperature condition includes: the outdoor environment temperature is less than or equal to the outdoor environment temperature threshold. The invention solves the technical problem of difficult oil return of the compressor under the condition that the air conditioner has no oil return bypass path.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to an air conditioner low-temperature heating starting control method and an air conditioner.
Background
When the air conditioner operates under the ultralow temperature working condition, the refrigerant oil is easily dissolved in the refrigerant and is discharged out of the compressor together with the refrigerant, so that the oil is easily emptied in the starting process of the compressor, and the operation reliability of a unit is influenced. In order to solve the problem of empty oil in the compressor, the related art generally adopts a mode of arranging an oil return bypass passage, so that the refrigeration oil flows back to the compressor through the oil return bypass passage.
However, in the household air conditioner, the design without the oil return bypass path is usually adopted in consideration of economical efficiency. In this case, the oil return of the air conditioner is more difficult, and the compressor is more likely to be empty.
Disclosure of Invention
In order to solve the technical problem that oil return of a compressor is difficult under the condition that an air conditioner is not provided with an oil return bypass, the invention provides a low-temperature heating starting control method of the air conditioner, which comprises the following steps: after receiving a heating starting instruction, acquiring the outdoor environment temperature; when the outdoor environment temperature meets a preset temperature condition, controlling the compressor to heat at a starting frequency for a preset time; acquiring the exhaust superheat degree and the exhaust superheat degree change rate in real time; when the exhaust superheat degree and the exhaust superheat degree change rate meet preset conditions, controlling the air conditioner to be switched from heating operation to cooling operation; wherein the preset temperature condition includes: the outdoor environment temperature is less than or equal to the outdoor environment temperature threshold.
The technical effect achieved after the technical scheme is adopted is as follows: and if the outdoor environment temperature meets the preset temperature condition, the air conditioner is in the low-temperature heating working condition currently. Through acquiring the exhaust superheat degree and the exhaust superheat degree change rate in real time, an accurate numerical basis can be provided for acquiring the heating effect and the heating state of the compressor, so that the air conditioner can be timely controlled to be switched from heating operation to refrigerating operation when the compressor is not heated well, the heat and the refrigerant oil exhausted by the compressor are quickly recovered to the compressor from an indoor unit, the oil discharge of the compressor can be reduced, the heating speed of the oil temperature of the compressor is increased, and the reliability of low-temperature heating starting of the air conditioner is ensured.
In this embodiment, the controlling the compressor to heat at the start frequency for the preset time period includes: controlling the compressor to heat at a first starting frequency for a first preset time; controlling the compressor to heat at a second starting frequency for a second preset time; wherein the first start-up frequency is greater than the second start-up frequency.
The technical effect achieved after the technical scheme is adopted is as follows: different starting frequencies are set according to different heating stages, so that the stable operation of the compressor can be ensured while the heating speed of the compressor is increased. The specific discussion is as follows: when the air conditioner is just started up in a heating mode, the system is not circulated, and the quantity of heat taken away by a refrigerant and the quantity of discharged oil are not high, so that the compressor is controlled to operate at a high first starting frequency to improve the heating speed of the compressor. After the air conditioner is heated and operated for a period of time, the system starts to circulate, and the heat taken away by the refrigerant and the oil discharge are increased, so that the compressor is controlled to operate at a lower second starting frequency, the heat taken away by the system is reduced, and the oil discharge is reduced.
In this embodiment, the preset conditions include: the exhaust superheat degree is less than or equal to an exhaust superheat degree threshold value, and the exhaust superheat degree change rate is less than or equal to an exhaust superheat degree change rate threshold value.
The technical effect achieved after the technical scheme is adopted is as follows: whether the current oil temperature of the compressor is heated can be known through the size relation between the exhaust superheat degree and the exhaust superheat degree threshold value. Whether the exhaust superheat degree is continuously changing can be judged according to the magnitude relation between the exhaust superheat degree change rate and the exhaust superheat degree change rate threshold value. If the exhaust superheat degree is less than or equal to the exhaust superheat degree threshold value and the exhaust superheat degree change rate is less than or equal to the exhaust superheat degree change rate threshold value, it is indicated that the current oil temperature of the compressor is low and the compressor is continuously heated, so that the air conditioner needs to be controlled to be switched from heating operation to cooling operation, the heating speed of the compressor is increased, and the temperature of the compressor is rapidly increased.
In this embodiment, the method for controlling the low-temperature heating start of the air conditioner further includes: after the air conditioner is converted into refrigeration operation, acquiring operation parameters of the air conditioner; if the operation parameters meet the heating condition, controlling the air conditioner to be switched from the refrigerating operation to the heating operation; wherein the operating parameter comprises one of: the temperature in the average pipe of the internal machine of the machine is started, the air suction superheat degree and the refrigerating running time are prolonged.
The technical effect achieved after the technical scheme is adopted is as follows: if any one of three operation parameters of average temperature in pipes, suction superheat degree and long-time refrigeration operation in the starting-up machine meets the heating condition, the condition indicates that the air conditioner is not suitable for continuing the refrigeration operation at present, and if the air conditioner is not switched back to the heating mode in time, the normal heating process in the room is influenced, or liquid return of a compressor is caused, or low-pressure protection and other problems are caused. In order to avoid the above problems, the air conditioner needs to be controlled to change from the cooling operation to the heating operation, so as to ensure the heating effect of the air conditioner, improve the stability of the air conditioner and further improve the use satisfaction of users.
In this embodiment, the heating conditions include: the temperature in the average pipe of the starting-up internal machine is less than or equal to the temperature threshold value in the average pipe of the starting-up internal machine.
The technical effect achieved after the technical scheme is adopted is as follows: if the temperature in the average pipe of the starting-up indoor unit is less than or equal to the temperature threshold value in the average pipe of the starting-up indoor unit, the heat of the indoor unit is basically recovered, and the air suction pressure is too low to cause low-pressure protection by controlling the refrigerating operation of the air conditioner. Thereby controlling the air conditioner to be switched from the cooling operation to the heating operation.
In this embodiment, the heating conditions include: and the suction superheat degree is less than or equal to a suction superheat degree threshold value.
The technical effect achieved after the technical scheme is adopted is as follows: if the suction superheat degree is less than or equal to the suction superheat degree threshold value, the liquid return phenomenon of the compressor is indicated, and therefore the four-way valve needs to be switched to convert the air conditioner from the refrigerating operation to the heating operation, and the operation reliability of the compressor is guaranteed.
In this embodiment, the heating conditions include: the refrigerating operation time length is more than or equal to a refrigerating operation time length threshold value.
The technical effect achieved after the technical scheme is adopted is as follows: considering that the refrigerating state is an abnormal state, the temperature in the pipe or the suction superheat degree is prevented from not meeting the exit condition all the time, a refrigerating operation long threshold value is set forcibly, if the refrigerating operation length is larger than or equal to the refrigerating operation long threshold value, the air conditioner is controlled to be switched from the refrigerating operation to the heating operation, and therefore the phenomenon that the low pressure is too low and the air conditioner is protected by the low pressure due to the fact that the refrigerating operation time is too long under the low-temperature working condition of the air conditioner can be avoided.
In this embodiment, the method for controlling the low-temperature heating start of the air conditioner further includes: controlling the air conditioner to switch between a first mode and a second mode; acquiring accumulated low-temperature start control time, and stopping switching if the accumulated low-temperature start control time is greater than a threshold of the accumulated low-temperature start control time; the first mode is to control the air conditioner to be switched from heating operation to cooling operation; and the second mode is to control the air conditioner to be switched from the cooling operation to the heating operation.
The technical effect achieved after the technical scheme is adopted is as follows: through switching back and forth between this first mode and this second mode, can retrieve compressor exhaust heat and refrigeration oil repeatedly to prevent compressor empty oil, and then promote super low temperature heating start reliability. The accumulated oil return time can be limited by setting the accumulated low-temperature start control time threshold, so that the air conditioner is prevented from being switched back and forth between the first mode and the second mode all the time to influence the normal heating process of the compressor. If the accumulated low-temperature starting control time length is larger than the accumulated low-temperature starting control time length threshold value, the fact that the oil temperature of the compressor is heated basically is indicated, and therefore switching is stopped and normal heating is recovered.
An embodiment of the present invention provides an air conditioner, including: the first acquisition module is used for acquiring the outdoor environment temperature after receiving a heating starting instruction; the first control module is used for controlling the compressor to heat at a starting frequency for a preset time when the outdoor environment temperature meets a preset temperature condition; the second acquisition module is used for acquiring the exhaust superheat degree and the exhaust superheat degree change rate in real time; the second control module is used for controlling the air conditioner to be switched from heating operation to cooling operation when the exhaust superheat degree and the exhaust superheat degree change rate meet preset conditions; wherein the preset temperature conditions include: the outdoor environment temperature is less than or equal to the outdoor environment temperature threshold.
An embodiment of the present invention provides an air conditioner, including: a computer readable storage medium and a packaged IC storing a computer program, when the computer program is read and executed by the packaged IC, the air conditioner implements the air conditioner low temperature heating start control method according to any one of the previous embodiments.
In summary, each of the above embodiments of the present application may have one or more of the following advantages or benefits:
through acquiring the exhaust superheat degree and the exhaust superheat degree change rate in real time, an accurate numerical basis can be provided for acquiring the heating effect and the heating state of the compressor, so that the air conditioner can be timely controlled to be switched from heating operation to refrigerating operation when the compressor is not heated well, the heat and the refrigerant oil exhausted by the compressor are quickly recovered to the compressor from an indoor unit, the oil discharge of the compressor can be reduced, the heating speed of the oil temperature of the compressor is increased, and the reliability of low-temperature heating starting of the air conditioner is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for controlling low-temperature heating start of an air conditioner according to a first embodiment of the present invention.
Fig. 2 is a schematic block diagram of an air conditioner according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
[ first embodiment ] A
Referring to fig. 1, a flowchart of a method for controlling low-temperature heating start of an air conditioner according to an embodiment of the present invention is shown. The control method for low-temperature heating starting of the air conditioner comprises the following steps:
step S10: and after receiving a heating starting instruction, acquiring the outdoor environment temperature.
Wherein the preset temperature conditions include: the outdoor environment temperature is less than or equal to the outdoor environment temperature threshold. For example, if the outdoor ambient temperature meets the preset temperature condition, it indicates that the outdoor ambient temperature at which the air conditioner is located when the heating start-up instruction is received is less than or equal to the outdoor ambient temperature threshold, that is, the air conditioner is currently in the low-temperature heating start-up condition.
Step S20: and when the outdoor environment temperature meets the preset temperature condition, controlling the compressor to heat at the starting frequency for a preset time.
Step S30: and acquiring the exhaust superheat degree and the exhaust superheat degree change rate in real time.
Step S40: and when the exhaust superheat degree and the change rate of the exhaust superheat degree meet preset conditions, controlling the air conditioner to be switched from heating operation to cooling operation. The switching between heating operation and cooling operation of the air conditioner can be realized by adjusting the four-way valve.
Through acquiring the exhaust superheat degree and the exhaust superheat degree change rate in real time, an accurate numerical basis can be provided for acquiring the heating effect and the heating state of the compressor, so that the air conditioner can be timely controlled to be switched from heating operation to refrigerating operation when the compressor is heated poorly, the heat and the refrigerant oil exhausted by the compressor are quickly recovered from the indoor unit to the compressor, the oil discharge of the compressor can be reduced, and the reliability of low-temperature heating starting of the air conditioner is improved.
In a specific embodiment, when the air conditioner is in a low-temperature heating starting working condition, after the compressor is controlled to perform heating operation at a starting frequency for a preset time, if the exhaust superheat degree and the change rate of the exhaust superheat degree meet a preset condition, it is indicated that the temperature of the current compressor is very low, and refrigerant and refrigeration oil cannot be effectively separated, that is, the oil discharge amount of the current compressor is large, so that the air conditioner needs to be controlled to perform cooling operation from heating operation to improve the heating speed of the compressor, and the heat and refrigeration oil discharged by the compressor are quickly recycled to the compressor from an indoor unit, so that the refrigerant and refrigeration oil can be effectively separated, the refrigeration oil taken away by the refrigerant during system circulation is reduced, the problem of empty oil of the compressor can be avoided, and the operation reliability of the compressor is ensured.
Specifically, the value range of the outdoor environment temperature threshold is [ -7,0] DEG C, and the optimal value is selected according to the actual situation. For example, when the outdoor environment temperature threshold is selected to be low, the low-temperature control range is reduced, the heat recovery and oil return effects are reduced, but the mode switching is reduced, and the noise influence caused by the four-way valve switching is reduced; when the outdoor environment temperature threshold is selected to be higher, the low-temperature control range is enlarged, the heat recovery effect and the oil return effect are increased, but the modes are frequently switched, and the noise influence caused by the switching of the four-way valve is increased.
Further, the controlling the compressor to heat at the starting frequency for a preset time period includes: controlling the compressor to heat at a first starting frequency for a first preset time; controlling the compressor to heat at a second starting frequency for a second preset time; wherein the first start-up frequency is greater than the second start-up frequency.
Different starting frequencies are set at different heating stages, so that the stable operation of the compressor can be ensured while the heating speed of the compressor is increased. The specific discussion is as follows: when the air conditioner is just started up in a heating mode, the system is not circulated, and the heat taken away by the refrigerant and the oil discharge are not high, so that the compressor is controlled to operate at a high first starting frequency, and the heating speed of the compressor can be increased. After the air conditioner heats and operates for a period of time, the system starts to circulate, and the heat taken away by the refrigerant and the oil discharge can be increased, so that the compressor is controlled to operate at a lower second starting frequency, the heat taken away by the system can be reduced, and the oil discharge can be reduced.
In one embodiment, the first start frequency is in a range of [35, 40] hz, and the first preset duration is in a range of [60, 90] s; the value range of the second starting frequency is [25, 30] Hz, and the value range of the second preset time length is [60, 90] s.
Further, the preset conditions include: the exhaust superheat degree is less than or equal to an exhaust superheat degree threshold value, and the exhaust superheat degree change rate is less than or equal to an exhaust superheat degree change rate threshold value.
Whether the current oil temperature of the compressor is heated or not can be known through the size relation between the exhaust superheat degree and the exhaust superheat degree threshold value. Whether the exhaust superheat degree continuously changes can be judged according to the magnitude relation between the exhaust superheat degree change rate and the exhaust superheat degree change rate threshold value.
If the exhaust superheat degree is less than or equal to the exhaust superheat degree threshold value, the current oil temperature of the compressor is low, and the oil temperature of the compressor is not heated; if the change rate of the exhaust superheat degree is smaller than or equal to the change rate threshold value of the exhaust superheat degree, the change of the exhaust superheat degree is continuously changed, namely the compressor is continuously heated. If the exhaust superheat degree is less than or equal to the exhaust superheat degree threshold value and the exhaust superheat degree change rate is less than or equal to the exhaust superheat degree change rate threshold value, it is indicated that the current oil temperature of the compressor is low and the compressor is continuously heated, so that the air conditioner needs to be controlled to be switched from heating operation to cooling operation, the heating speed of the compressor is increased, and the temperature of the compressor is rapidly increased.
In one embodiment, the exhaust superheat threshold value is in the range of [10, 20] deg.C, and the exhaust superheat change rate threshold value is in the range of [1,2] deg.C.
Further, the method for controlling the low-temperature heating start of the air conditioner, for example, further comprises:
step S40: after the air conditioner is converted into refrigeration operation, acquiring operation parameters of the air conditioner;
step S50: if the operation parameters meet the heating condition, controlling the air conditioner to be switched from the refrigerating operation to the heating operation;
wherein the operating parameter comprises one of: the temperature in the average pipe of the internal machine of the machine is started, the air suction superheat degree and the refrigerating running time are prolonged.
If any one of three operation parameters of average temperature in pipes, suction superheat degree and long-time refrigeration operation in the starting-up machine meets the heating condition, the condition indicates that the air conditioner is not suitable for continuing the refrigeration operation at present, and if the air conditioner is not switched back to the heating mode in time, the normal heating process in the room is influenced, or liquid return of a compressor is caused, or low-pressure protection and other problems are caused. In order to avoid the above problems, the air conditioner needs to be controlled to change from the cooling operation to the heating operation, so as to ensure the heating effect of the air conditioner, improve the stability of the air conditioner and further improve the use satisfaction of users.
Further, if the operation parameter meets a heating condition, the controlling the air conditioner to convert the cooling operation into the heating operation includes: and if the temperature in the average pipe of the internal machine of the starting machine is less than or equal to the temperature threshold value in the average pipe of the internal machine of the starting machine, controlling the air conditioner to be switched from the cooling operation to the heating operation.
For example, if the temperature in the average tube of the indoor unit of the air conditioner is less than or equal to the temperature threshold in the average tube of the indoor unit of the air conditioner, it indicates that the heat of the indoor unit is substantially recovered, and then the air conditioner is controlled to perform cooling operation, which may result in too low suction pressure and low pressure protection. Thereby controlling the air conditioner to be switched from the cooling operation to the heating operation. Wherein, the value range of the temperature threshold value in the average pipe of the internal machine of the starting machine is [ -20, -10] ° C.
Further, if the operation parameter meets a heating condition, the controlling the air conditioner to convert the cooling operation into the heating operation includes: and if the suction superheat degree is less than or equal to the suction superheat degree threshold value, controlling the air conditioner to be switched from the refrigerating operation to the heating operation.
If the suction superheat degree is less than or equal to the suction superheat degree threshold value, the liquid return phenomenon of the compressor is indicated, and therefore the four-way valve needs to be switched to change the air conditioner from the refrigerating operation to the heating operation, and the operation reliability of the compressor is guaranteed. Wherein, the value range of the threshold value of the degree of superheat of the inspiration is [ -1,0] ° C.
Further, if the operation parameter meets a heating condition, the controlling the air conditioner to convert the cooling operation into the heating operation includes: and if the length during the refrigerating operation is more than or equal to the length threshold during the refrigerating operation, controlling the air conditioner to be switched from the refrigerating operation to the heating operation.
Considering that the refrigeration state is an abnormal state, the temperature in the pipe or the suction superheat degree is prevented from not meeting the exit condition all the time, a long threshold value during refrigeration operation is set forcibly, if the length during refrigeration operation is larger than or equal to the long threshold value during refrigeration operation, the air conditioner is controlled to be switched from refrigeration operation to heating operation, and therefore the phenomenon that the low pressure is too low and the air conditioner is protected at low pressure due to overlong refrigeration operation time under the low-temperature working condition of the air conditioner can be avoided. Wherein, the value range of the long threshold value during the refrigeration operation is [60, 120] s.
Further, the method for controlling the low-temperature heating start of the air conditioner further comprises the following steps:
step S60: controlling the air conditioner to switch between a first mode and a second mode;
step S70: acquiring accumulated low-temperature start control time, and stopping switching if the accumulated low-temperature start control time is greater than a threshold of the accumulated low-temperature start control time;
wherein, the first mode is to control the air conditioner to change the heating operation into the cooling operation, namely step S10-step S30; the second mode is to control the air conditioner to change from the cooling operation to the heating operation, namely, step S40 to step S50. The value range of the accumulated low-temperature start control time length threshold is [20, 30] min.
Through switching back and forth between this first mode and this second mode, can retrieve compressor exhaust heat and refrigeration oil repeatedly to prevent compressor empty oil, and then promote super low temperature heating start reliability. The accumulated oil return time can be limited by setting the accumulated low-temperature start control time threshold, so that the air conditioner is prevented from being switched back and forth between the first mode and the second mode all the time to influence the normal heating process of the compressor. If the accumulated low-temperature starting control time length is larger than the accumulated low-temperature starting control time length threshold value, the fact that the heating of the oil temperature of the compressor is basically finished is indicated, and therefore switching is stopped and normal heating is recovered.
[ second embodiment ]
Referring to fig. 2, a block diagram of an air conditioner 200 according to a second embodiment of the present invention is shown. The air conditioner 200 includes, for example: a first acquisition module 210, a first control module 220, a second acquisition module 230, and a second control module 240. The first obtaining module 210 is configured to obtain an outdoor environment temperature after receiving a heating start instruction; the first control module 220 is configured to control the compressor to heat at a start frequency for a preset time period when the outdoor ambient temperature meets a preset temperature condition; the second obtaining module 230 is configured to obtain the exhaust superheat degree and the exhaust superheat degree change rate in real time; the second control module 240 is configured to control the air conditioner to switch from the heating operation to the cooling operation when the exhaust superheat degree and the exhaust superheat degree change rate satisfy a preset condition. Specifically, the preset temperature conditions include: the outdoor environment temperature is less than or equal to the outdoor environment temperature threshold.
In one embodiment: the first obtaining module 210, the first control module 220, the second obtaining module 230, and the second control module 240 cooperate with each other to implement any one of the methods for controlling the low-temperature heating start of the air conditioner according to the first embodiment of the present invention.
[ third embodiment ] A
A third embodiment of the present invention provides an air conditioner. The air conditioner includes: a computer readable storage medium and a packaged IC storing a computer program, when the computer program is read and executed by the packaged IC, the air conditioner implements any one of the methods for controlling low temperature heating startup of an air conditioner provided in the first embodiment of the present invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in each of the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of each embodiment of the present invention.
Claims (8)
1. A low-temperature heating starting control method of an air conditioner is characterized by comprising the following steps:
after receiving a heating starting instruction, acquiring the outdoor environment temperature;
when the outdoor environment temperature meets a preset temperature condition, controlling the compressor to heat at a starting frequency for a preset time;
acquiring the exhaust superheat degree and the exhaust superheat degree change rate in real time;
when the exhaust superheat degree and the exhaust superheat degree change rate meet preset conditions, controlling the air conditioner to be switched from heating operation to cooling operation;
wherein the preset temperature conditions include: the outdoor environment temperature is less than or equal to the outdoor environment temperature threshold;
the controlling the compressor to heat at the starting frequency for a preset time period comprises:
controlling the compressor to heat at a first starting frequency for a first preset time;
controlling the compressor to heat at a second starting frequency for a second preset time;
wherein the first start-up frequency is greater than the second start-up frequency;
the preset conditions include: the exhaust superheat degree is less than or equal to an exhaust superheat degree threshold value, and the exhaust superheat degree change rate is less than or equal to an exhaust superheat degree change rate threshold value.
2. The control method for starting up heating to cool down an air conditioner according to claim 1, wherein the control method for starting up heating to cool down an air conditioner further comprises:
after the air conditioner is converted into refrigeration operation, acquiring operation parameters of the air conditioner;
if the operation parameters meet the heating conditions, controlling the air conditioner to be switched from the refrigerating operation to the heating operation;
wherein the operating parameter comprises one of: the temperature in the average pipe of the internal machine of the machine is started, the air suction superheat degree and the refrigerating running time are prolonged.
3. The air conditioner low temperature heating start control method of claim 2, wherein the heating condition includes:
and the temperature in the average tube of the internal machine of the starting machine is less than or equal to the temperature threshold value in the average tube of the internal machine of the starting machine.
4. The air conditioner low temperature heating start control method of claim 2, wherein the heating condition includes:
and the suction superheat degree is less than or equal to a suction superheat degree threshold value.
5. The air conditioner low temperature heating start control method of claim 2, wherein the heating condition includes:
the refrigerating operation time length is more than or equal to a refrigerating operation time length threshold value.
6. The air conditioner low temperature heating start-up control method of claim 2, wherein the air conditioner low temperature heating start-up control method further comprises:
controlling the air conditioner to switch between a first mode and a second mode;
acquiring accumulated low-temperature start control time, and stopping switching if the accumulated low-temperature start control time is greater than a threshold of the accumulated low-temperature start control time;
the first mode is to control the air conditioner to be switched from heating operation to cooling operation; the second mode is to control the air conditioner to be switched from the refrigerating operation to the heating operation; the accumulated low-temperature start control time period is the sum of the accumulated operation time period of the first mode and the accumulated operation time period of the second mode.
7. An air conditioner, comprising:
the first acquisition module is used for acquiring the outdoor environment temperature after receiving a heating starting instruction;
the first control module is used for controlling the compressor to heat at a starting frequency for a preset time when the outdoor environment temperature meets a preset temperature condition;
the second acquisition module is used for acquiring the exhaust superheat degree and the exhaust superheat degree change rate in real time;
the second control module is used for controlling the air conditioner to be switched from heating operation to cooling operation when the exhaust superheat degree and the exhaust superheat degree change rate meet preset conditions;
wherein the preset temperature condition includes: the outdoor environment temperature is less than or equal to the outdoor environment temperature threshold;
the controlling the compressor to heat at the starting frequency for a preset time period comprises:
controlling the compressor to heat at a first starting frequency for a first preset time;
controlling the compressor to heat at a second starting frequency for a second preset time;
wherein the first start-up frequency is greater than the second start-up frequency;
the preset conditions include: the exhaust superheat degree is less than or equal to an exhaust superheat degree threshold value, and the exhaust superheat degree change rate is less than or equal to an exhaust superheat degree change rate threshold value.
8. An air conditioner, comprising: a computer-readable storage medium storing a computer program and a packaged IC, the computer program being read by and executed by the packaged IC, the air conditioner implementing the air conditioner low temperature heating start control method as claimed in any one of claims 1 to 6.
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| EP0960755A1 (en) * | 1998-05-28 | 1999-12-01 | Valeo Climatisation | Air conditioning circuit using a refrigerant fluid in a supercritical state, in particular for a vehicle |
| CN102338444A (en) * | 2011-09-28 | 2012-02-01 | 宁波奥克斯电气有限公司 | Ice-storage control method for supercooled water direct-current frequency conversion ice-storage multi-connected air conditioner |
| CN105928064A (en) * | 2016-04-29 | 2016-09-07 | 广东美的暖通设备有限公司 | VRV system and valve control method for supercooling loop of VRV system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107575939B (en) * | 2017-09-07 | 2019-10-25 | 珠海格力电器股份有限公司 | Multi-line system and its control method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0960755A1 (en) * | 1998-05-28 | 1999-12-01 | Valeo Climatisation | Air conditioning circuit using a refrigerant fluid in a supercritical state, in particular for a vehicle |
| CN102338444A (en) * | 2011-09-28 | 2012-02-01 | 宁波奥克斯电气有限公司 | Ice-storage control method for supercooled water direct-current frequency conversion ice-storage multi-connected air conditioner |
| CN105928064A (en) * | 2016-04-29 | 2016-09-07 | 广东美的暖通设备有限公司 | VRV system and valve control method for supercooling loop of VRV system |
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