CN114370689B - Refrigerant charge amount determination method, control method, air conditioner, and storage medium - Google Patents
Refrigerant charge amount determination method, control method, air conditioner, and storage medium Download PDFInfo
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- CN114370689B CN114370689B CN202210101048.6A CN202210101048A CN114370689B CN 114370689 B CN114370689 B CN 114370689B CN 202210101048 A CN202210101048 A CN 202210101048A CN 114370689 B CN114370689 B CN 114370689B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
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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
- F24F11/48—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring prior to normal operation, e.g. pre-heating or pre-cooling
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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
- F24F11/70—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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
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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
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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
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Abstract
The invention relates to the technical field of air conditioners, in particular to a refrigerant charge judging method, a control method, an air conditioner and a storage medium. The invention solves the problems that: how to pour accurate refrigerant into the air conditioner at different temperatures. To solve the above problems, an embodiment of the present invention provides a method for determining a refrigerant charge amount for an air conditioner, the method including: selecting a first operation parameter and a second operation parameter of the air conditioner according to the outdoor environment temperature of the air conditioner; controlling a first operation parameter until the circulation amount of the refrigerant of the air conditioner is kept stable, and filling the refrigerant into the air conditioner; judging the refrigerant filling amount of the air conditioner according to the second operation parameter; wherein the first operating parameter is an operating parameter related to a refrigerant circulation amount and the second operating parameter is an operating parameter related to a refrigerant charge amount.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant charge judging method, a control method, an air conditioner and a storage medium.
Background
The refrigerant quantity is unsuitable to easily cause the problems of unstable operation, performance reduction and the like of a multi-split system unit, the proper refrigerant quantity is the basis of stable operation, at present, the system can be monitored in real time according to parameters such as high pressure, opening degree of an inner machine valve, supercooling degree and the like, and further the automatic judgment of the refrigerant quantity in the filling process is realized, but the single parameter judgment is influenced by factors such as indoor and outdoor environment temperature, machine type and the like, and the judged refrigerant quantity has certain deviation.
Disclosure of Invention
The invention solves the problems that: how to pour accurate refrigerant into the air conditioner at different temperatures.
To solve the above problems, an embodiment of the present invention provides a method for determining a refrigerant charge amount for an air conditioner, the method including: selecting a first operation parameter and a second operation parameter of the air conditioner according to the outdoor environment temperature of the air conditioner; controlling a first operation parameter until the circulation amount of the refrigerant of the air conditioner is kept stable, and filling the refrigerant into the air conditioner; judging the refrigerant filling amount of the air conditioner according to the second operation parameter; wherein the first operating parameter is an operating parameter related to a refrigerant circulation amount and the second operating parameter is an operating parameter related to a refrigerant charge amount.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the parameters of the air conditioner are adjusted according to different outdoor environment temperatures, the circulation quantity of the refrigerant of the air conditioner is kept stable by controlling the first operation parameters, the condition that the refrigerant is not influenced by working loss in the process of filling the refrigerant is ensured, the filling quantity of the refrigerant is judged by the second operation parameters, and the filling quantity of the refrigerant is more accurate.
In one embodiment of the present invention, further comprising: the first operating parameter is selected from one or a combination of the following: compressor frequency, fan speed; and/or the second operating parameter is selected from one or a combination of the following: high pressure temperature, opening degree of expansion valve of indoor unit and supercooling degree.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the law of opening of the internal machine valve is combined with the law of high-pressure change, so that the quantity of the refrigerant in the air conditioning system can be accurately judged at different external temperatures, the automatic filling function is enabled to be more accurate in filling quantity when the refrigerant is filled, and the practicability of the automatic filling function is improved.
In one embodiment of the present invention, selecting a first operation parameter and a second operation parameter of an air conditioner according to an outdoor environment temperature of the air conditioner includes: and under the condition that the outdoor environment temperature is less than or equal to the temperature threshold value, selecting the compressor frequency and the fan rotating speed of the air conditioner as first operation parameters, and selecting the high-pressure temperature of the air conditioner as second operation parameters.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the temperature threshold is set to enable the opening degree of the internal machine valve and the high pressure to be provided with the demarcation point, the system can compare with the temperature threshold according to the external temperature, the reasonable judgment mode is selected to control the refrigerant filling quantity, and meanwhile, the temperature threshold can be adjusted according to specific conditions, so that the compatibility of the automatic filling function is improved.
In one embodiment of the present invention, determining a refrigerant charge of an air conditioner according to a second operating parameter includes: under the condition that the high-pressure temperature falls into a first temperature interval, judging that the refrigerant charge is proper; and/or, in the case that the high-pressure temperature is lower than the lower limit value of the first temperature section, determining that the refrigerant charge is insufficient; and/or, in the case where the high-pressure temperature is higher than the upper limit value of the first temperature section, determining that the refrigerant charge amount is excessive.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the temperature interval is set to divide the filling, releasing and maintaining circulation quantity of the refrigerant, so that the condition that the refrigerant quantity of the air conditioning system is filled more or less in the adjusting process is avoided, the influence of the transient error of the system on the filling quantity is reduced, and the stability of an automatic filling function is improved.
In one embodiment of the present invention, further comprising: the lower limit value and the upper limit value of the first temperature interval are respectively in linear correlation with the outdoor environment temperature; protection formula t1=a1+b1×tao, t2=a2+b2×tao, and parameter value.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the refrigerant with the same volume can raise the same high-pressure temperature, so that the judgment of the refrigerant filling amount according to the high-pressure temperature becomes more accurate, the temperature interval is linearly related to the outdoor temperature, and the value of the high-pressure temperature is ensured to be positioned in the temperature interval when the external temperature is less than or equal to 10 ℃ and the filling amount reaches the standard.
In one embodiment of the present invention, selecting a first operation parameter and a second operation parameter of an air conditioner according to an outdoor environment temperature of the air conditioner includes: and under the condition that the outdoor environment temperature is greater than a first temperature threshold value, selecting the frequency of the compressor of the air conditioner as a first operation parameter, and selecting the opening degree of the expansion valve of the indoor unit of the air conditioner as a second operation parameter.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: communication faults such as compressor exhaust protection and high-pressure protection caused by too high refrigerant filling speed are avoided by controlling the working frequency of the compressor, and the stability of the filling process is improved.
In one embodiment of the present invention, determining a refrigerant charge of an air conditioner according to a second operating parameter includes: when the opening of the expansion valve of the indoor unit falls into a valve opening section, judging that the refrigerant filling amount is proper; and/or when the indoor unit expansion valve opening is lower than the lower limit value of the valve opening section, determining that the refrigerant charge is insufficient; and/or, when the indoor unit expansion valve opening is higher than the upper limit value of the valve opening section, determining that the refrigerant charge amount is excessive.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the valve opening interval is set to divide the refrigerant filling, releasing and maintaining circulation quantity, so that the condition that the refrigerant quantity of the air conditioning system is filled more or less in the adjusting process is avoided, the influence of the transient error of the system on the filling quantity is reduced, and the stability of an automatic filling function is improved.
In one embodiment of the present invention, further comprising: the lower limit value and the upper limit value of the second temperature interval are respectively and linearly related to the indoor environment temperature of the air conditioner; protection formula m1=a3+b3×t inner ring, m2=a4+b4×t inner ring, and parameter values.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the refrigerant with the same volume can reduce the same valve opening interval, so that the judgment of the refrigerant filling amount according to the valve opening interval becomes more accurate, the valve opening interval is linearly related to the indoor temperature, and the valve opening value is ensured to be positioned in the valve opening interval when the external temperature is less than or equal to 10 ℃ and the filling amount reaches the standard.
The present invention also provides an air conditioner including a processor, a memory, and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the control method as in the above embodiments.
The present invention also provides a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the steps of the control method as in the above embodiments.
Drawings
FIG. 1 is a flow chart of a decision method of the present invention;
FIG. 2 is a schematic diagram of a decision method according to the present invention;
FIG. 3 is a schematic diagram showing the relationship between the opening of the expansion valve of the indoor unit and the indoor temperature;
FIG. 4 is a graph showing the relationship between the high pressure temperature and the outdoor temperature according to the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
[ first embodiment ]
Referring to fig. 1 and 2, in one particular embodiment, the method includes:
s100, selecting a first operation parameter and a second operation parameter of the air conditioner according to the outdoor environment temperature of the air conditioner;
s200, controlling a first operation parameter until the circulation quantity of the refrigerant of the air conditioner is kept stable, and filling the refrigerant into the air conditioner;
s300, judging the refrigerant charge of the air conditioner according to the second operation parameter;
wherein the first operating parameter is an operating parameter related to a refrigerant circulation amount and the second operating parameter is an operating parameter related to a refrigerant charge amount.
In step S100, the temperature of the outdoor environment is detected by a temperature sensor and other devices, the automatic filling function of the air conditioning system is started, and different operation parameters are selected according to different outdoor environments, so that smooth filling of the refrigerant is ensured; in step S200, the circulation amount of the refrigerant of the air conditioner is controlled to be stable by controlling the first operation parameter, and the refrigerant is lost in the operation process of the air conditioner, so that the circulation amount of the refrigerant needs to be kept stable, and after the circulation amount is stable and the air conditioner operates for a period of time, a judgment result of the refrigerant amount is displayed on a main control board of the air conditioner, and the judgment result is the circulation amount of the refrigerant in the air conditioner; in step S300, the filling amount of the refrigerant is controlled according to the second operation parameter, and when the first operation parameter is used as a reference, the refrigerant is filled according to the determination result, so that the deviation of the filling amount caused by consumption in the process of filling is avoided, and the filling amount of the refrigerant is more accurate.
In operation, the start of the automatic refrigerant charge needs to be judged after the air conditioner is started for 15 minutes, and if the operation time is less than 15 minutes, the judging method is not executed.
The parameters of the air conditioner are adjusted according to different outdoor environment temperatures, the circulation quantity of the refrigerant of the air conditioner is kept stable by controlling the first operation parameters, the condition that the refrigerant is not influenced by working loss in the process of filling the refrigerant is ensured, the filling quantity of the refrigerant is judged by the second operation parameters, and the filling quantity of the refrigerant is more accurate.
[ second embodiment ]
In a specific embodiment, the method further comprises:
s210, the first operation parameter is selected from one or a combination of the following: compressor frequency, fan speed; and/or
S310, the second operation parameter is selected from one or a combination of the following: high pressure temperature, opening degree of expansion valve of indoor unit and supercooling degree.
In step S210, different first operation parameters are selected and controlled according to different outdoor environment temperatures of the air conditioner, when the outside temperature is less than or equal to 10 ℃, a certain output ratio needs to be controlled, namely, the compressor frequency and the fan rotation speed are respectively fixed, when the circulation amount of the refrigerant is stable, the judgment result of the refrigerant amount is displayed, and when the outside temperature is greater than 10 ℃, only a certain compressor frequency is controlled, and the corresponding fan rotation speed is not controlled.
In step 310, the high pressure temperature, the opening degree of the expansion valve of the indoor unit, and the supercooling degree can be used as factors of the refrigerant charge amount, wherein the high pressure temperature and the opening degree of the expansion valve of the indoor unit are used as main judging factors, the supercooling degree is used as auxiliary judging factors, the law of the opening degree of the valve of the indoor unit is obvious when the outdoor temperature is higher than 10 ℃, the refrigerant charge is started after the determination of the amount of the refrigerant in the system is finished, and the opening degree of the valve of the indoor unit is automatically reduced to maintain the refrigerant amount of the evaporator when the refrigerant circulation amount is increased, so that the smaller the opening degree of the valve of the indoor unit is, the more the refrigerant in the air conditioning system is.
When the external temperature is less than or equal to 10 ℃, the supercooling degree variation along with the outdoor temperature is not obvious, and the variation of the internal machine valves with different refrigerant amounts is not great; after the frequency and the rotating speed of the fan are fixed, the high-voltage rule is obvious, and the judgment is convenient; when the outside temperature is greater than 10 ℃, the high pressure is influenced by the frequencies of the fan and the compressor, and the rotating speeds of the fans under all working conditions are not necessarily the same, so that the judgment of the refrigerant filling quantity is influenced.
The indoor ambient temperature is, for example, 15 c and the outdoor ambient temperature is 9 c. At this time, it is possible to determine that the air conditioning system is in the determination condition that the outside temperature is less than 10 ℃, so that the air conditioning system enters the refrigerant amount determination process based on the high-pressure temperature as a main determination basis after being started.
The law of opening of the internal machine valve is combined with the law of high-pressure change, so that the quantity of the refrigerant in the air conditioning system can be accurately judged at different external temperatures, the automatic filling function is enabled to be more accurate in filling quantity when the refrigerant is filled, and the practicability of the automatic filling function is improved.
[ third embodiment ]
In a specific embodiment, selecting the first operating parameter and the second operating parameter of the air conditioner according to the outdoor environment temperature of the air conditioner includes:
s220, under the condition that the outdoor environment temperature is less than or equal to a temperature threshold value, selecting the compressor frequency and the fan rotating speed of the air conditioner as first operation parameters, and selecting the high-pressure temperature of the air conditioner as second operation parameters.
In step S220, when the outdoor temperature is less than or equal to the temperature threshold, the frequency of the compressor of the air conditioner and the rotation speed of the fan are both fixed, the high-pressure temperature is used as the main basis for determining the amount of refrigerant, the high-pressure temperature is obtained by converting the high-pressure of the compressor, the fan controls the high pressure to be in a certain range, the protective adjustment is performed, when the rotation speed of the fan is not the maximum, the amount of refrigerant increases, the high-pressure maintains the target pressure interval under the fan adjustment, and when the fan reaches the maximum rotation speed, the more refrigerant, the higher the high-pressure is, therefore, when the fan maintains at a certain rotation speed, the more the amount of refrigerant is, the higher the high-pressure is.
In general, the temperature threshold is 10 ℃, preferably, when working under different environments, the temperature threshold can be properly adjusted, so that the change of the high-pressure is used as the main basis of the refrigerant charge in a regularly obvious range, for example: when the external atmospheric pressure is low, the temperature threshold can be appropriately lowered.
Exemplary, the indoor ambient temperature ranges from 10-35 ℃ and the outdoor ambient temperature ranges from 0-45 ℃. If the air conditioning system detects that the indoor environment temperature is 15 ℃, the external environment temperature is 12 ℃. At this time, the air conditioning system can be determined to be in the judging condition that the external environment temperature is more than or equal to 10 ℃, so that the air conditioning system can enter a refrigerant quantity judging process taking the opening of the internal machine valve as a main judging basis after being started.
The temperature threshold is set to enable the opening degree of the internal machine valve and the high pressure to be provided with the demarcation point, the system can compare with the temperature threshold according to the external temperature, the reasonable judgment mode is selected to control the refrigerant filling quantity, and meanwhile, the temperature threshold can be adjusted according to specific conditions, so that the compatibility of the automatic filling function is improved.
[ fourth embodiment ]
Referring to fig. 3, in one specific embodiment, determining the refrigerant charge of the air conditioner according to the second operation parameter includes:
s320, judging that the refrigerant charge is proper when the high-pressure temperature falls into a first temperature interval; and/or
S330, when the high-pressure temperature is lower than the lower limit value of the first temperature interval, judging that the refrigerant charge is insufficient; and/or
S340, when the high-pressure temperature is higher than the upper limit value of the first temperature zone, it is determined that the refrigerant charge amount is excessive.
When the external temperature is less than or equal to the temperature threshold value, the frequency of the compressor and the rotating speed of the fan are kept fixed, the circulation volume of the refrigerant in the air conditioning system is kept basically stable after the air conditioning system is operated for a certain period of time, and the high-pressure of the compressor is detected and converted into the corresponding high-pressure temperature.
In step S330, when the high pressure temperature is lower than the lower limit value of the first temperature interval, it is indicated that the amount of refrigerant in the air conditioning system is insufficient, and at this time, the refrigerant is controlled to be charged into the air conditioning system, and the high pressure increases along with the charging process;
in step S320, when the high-pressure temperature falls within the first temperature range, it is indicated that the refrigerant amount in the air conditioning system has reached the standard of normal operation, and the performance of the air conditioner is recovered, and at this time, a proper word of the refrigerant amount is displayed on the main control board, and then, after the target time is continuously filled, the refrigerant filling is closed; it should be noted that, the target time is usually 5 minutes, but the time can be prolonged or shortened appropriately according to the values of the high pressure;
in step S310, when the high-pressure temperature is higher than the upper limit value of the first temperature interval, it is indicated that the amount of refrigerant in the air conditioning system has exceeded the normal operation requirement of the air conditioner, and at this time, the main control board displays that the judgment result is a multi-refrigerant state, and controls the air conditioner to release the refrigerant, so as to reduce the high-pressure temperature to the first temperature interval, and then step S320 is repeated.
The temperature interval is set to divide the filling, releasing and maintaining circulation quantity of the refrigerant, so that the condition that the refrigerant quantity of the air conditioning system is filled more or less in the adjusting process is avoided, the influence of the transient error of the system on the filling quantity is reduced, and the stability of an automatic filling function is improved.
[ fifth embodiment ]
In a specific embodiment, the method further comprises:
s340, respectively linearly correlating the lower limit value and the upper limit value of the first temperature interval with the outdoor environment temperature; the first temperature interval is obtained by the following formula: t1=a1+b1×tao, t2=a2+b2×tao; wherein T1 is the lower limit value of the first temperature interval, T2 is the upper limit value of the first temperature interval, tao is the outdoor environment temperature, a1 is more than or equal to 29 and less than or equal to 29.5, a2 is more than or equal to 34 and less than or equal to 34.5,1.3, b1 is more than or equal to 1.35,1.3 and b2 is more than or equal to 1.35.
In step S340, at the same outdoor temperature, the value of the high-pressure temperature is positively correlated with the percentage of the refrigerant amount, the higher the refrigerant concentration, the higher the high-pressure temperature, and increasing the same concentration of the refrigerant increases the same high-pressure temperature, the lower and upper limits of the first temperature interval being linearly correlated with the outdoor temperature.
T1 is a lower limit value of the first temperature zone, and T2 is an upper limit value of the first temperature zone, and when the external temperature is equal to or lower than 10 ℃, 29.ltoreq.a1.ltoreq.29.5, 34.ltoreq.a2.ltoreq. 34.5,1.3.ltoreq.b1=b2.ltoreq.1.35, preferably a1=29.13, a2=34.13, b1=b2=1.33.
The refrigerant with the same volume can raise the same high-pressure temperature, so that the judgment of the refrigerant filling amount according to the high-pressure temperature becomes more accurate, the temperature interval is linearly related to the outdoor temperature, and the value of the high-pressure temperature is ensured to be positioned in the temperature interval when the external temperature is less than or equal to 10 ℃ and the filling amount reaches the standard.
[ sixth embodiment ]
In a specific embodiment, selecting the first operating parameter and the second operating parameter of the air conditioner according to the outdoor environment temperature of the air conditioner includes:
s230, when the outdoor environment temperature is greater than the first temperature threshold value, selecting the compressor frequency of the air conditioner as a first operation parameter, and selecting the opening degree of an expansion valve of an indoor unit of the air conditioner as a second operation parameter.
In step S230, when the outdoor temperature is greater than the temperature threshold, the working frequency of the compressor is controlled, so as to avoid communication faults such as exhaust protection and high-pressure protection of the compressor caused by too high refrigerant charging speed, and increase the stability of refrigerant charging. Preferably, the temperature threshold is 10 ℃.
Communication faults such as compressor exhaust protection and high-pressure protection caused by too high refrigerant filling speed are avoided by controlling the working frequency of the compressor, and the stability of the filling process is improved.
[ seventh embodiment ]
Referring to fig. 4, in one specific embodiment, determining the refrigerant charge of the air conditioner according to the second operation parameter includes:
s360, judging that the refrigerant charge is proper when the opening degree of the expansion valve of the indoor unit falls into a valve opening degree section; and/or
S370, when the opening degree of the expansion valve of the indoor unit is lower than the lower limit value of the valve opening degree section, judging that the refrigerant charge is insufficient; and/or
S380, when the indoor unit expansion valve opening is higher than the upper limit value of the valve opening section, it is determined that the refrigerant charge amount is excessive.
When the external temperature is higher than the temperature threshold, the compressor is kept to run at a certain working frequency, and refrigerant is charged, and the circulation amount of the refrigerant is increased in the charging process, so that the opening of the internal machine valve is also reduced.
In step S370, when the opening of the expansion valve of the indoor unit is higher than the upper limit value of the valve opening section, it is indicated that the amount of refrigerant in the air conditioning system is insufficient, and at this time, the refrigerant is controlled to be filled into the air conditioning system, and the valve opening is reduced along with the filling process;
in step S360, when the opening of the expansion valve of the indoor unit falls into the valve opening interval, it is indicated that the refrigerant amount in the air conditioning system has reached the standard of normal operation, the performance of the air conditioner is recovered, at this time, a proper word of the refrigerant amount is displayed on the main control board, and then, the refrigerant charging is turned off after the target time is continuously charged; the target time is usually 5 minutes, but the time is prolonged or shortened appropriately according to the opening degree of the internal machine valve;
in step S380, when the opening of the expansion valve of the indoor unit is higher than the upper limit value of the valve opening interval, it is indicated that the amount of refrigerant in the air conditioning system has exceeded the normal operation requirement of the air conditioner, and at this time, the main control board displays that the judgment result is a multi-refrigerant state, controls the air conditioner to release the refrigerant, increases the valve opening of the indoor unit to the valve opening interval, and then repeats step S360.
The valve opening interval is set to divide the refrigerant filling, releasing and maintaining circulation quantity, so that the condition that the refrigerant quantity of the air conditioning system is filled more or less in the adjusting process is avoided, the influence of the transient error of the system on the filling quantity is reduced, and the stability of an automatic filling function is improved.
[ eighth embodiment ]
In a specific embodiment, the method further comprises: s390, the lower limit value and the upper limit value of the second temperature interval are respectively in linear correlation with the indoor environment temperature of the air conditioner; the linear relation between the valve opening interval and the indoor environment temperature is as follows: m1=a3+b3×t inner ring, m2=a4+b4×t inner ring; wherein M1 is the lower limit value of the valve opening interval, M2 is the upper limit value of the valve opening interval, the T inner ring is the outdoor environment temperature, a3 is more than or equal to 99 and less than or equal to 101, a4 is more than or equal to 34 and less than or equal to 36,2.2, b3 is more than or equal to 2.4,6.9 and b4 is more than or equal to 7.1.
In step S390, at the same indoor temperature, the magnitude of the opening of the internal valve is positively correlated with the percentage of the refrigerant amount, and the higher the refrigerant concentration is, the larger the opening of the internal valve is, and the lower limit value and the upper limit value of the valve opening section are linearly correlated with the indoor temperature.
M1 is a lower limit value of the valve opening interval, and M2 is an upper limit value of the valve opening interval, and in general, when the external temperature is greater than 10 ℃, 99.ltoreq.a3.ltoreq.101, 34.ltoreq.a4.ltoreq. 36,2.2.ltoreq.b3.ltoreq. 2.4,6.9.ltoreq.b4.ltoreq.7.1, preferably a3=100, a4=35, b3=2.3, b4=7.
The refrigerant with the same volume can reduce the same valve opening interval, so that the judgment of the refrigerant filling amount according to the valve opening interval becomes more accurate, the valve opening interval is linearly related to the indoor temperature, and the valve opening value is ensured to be positioned in the valve opening interval when the external temperature is less than or equal to 10 ℃ and the filling amount reaches the standard.
[ ninth embodiment ]
In a specific embodiment, the method further comprises: a control method for refrigerant charge of an air conditioner, which determines a refrigerant charge amount of the air conditioner according to a second operation parameter, comprising: when the refrigerant quantity in the air conditioner is insufficient, the refrigerant is filled; when the refrigerant quantity in the air conditioner is excessive, releasing the refrigerant; and when the refrigerant in the air conditioner is proper in quantity, stopping filling after the target time is continuously filled.
The target time is usually 5 minutes, and after the judgment of the refrigerant quantity is completed, the refrigerant charge and discharge are controlled by a control method, so that the refrigerant in the air conditioning system can meet the performance of the air conditioner.
[ tenth embodiment ]
In a specific embodiment, the present invention also provides an air conditioner, where the air conditioner includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, and the program or instructions implement the steps of the control method in the above embodiment when executed by the processor. The present invention also provides a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the steps of the control method as in the above embodiments.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (10)
1. A refrigerant charge amount determination method for an air conditioner, the method comprising:
selecting a first operation parameter and a second operation parameter of the air conditioner according to the outdoor environment temperature of the air conditioner;
controlling the first operation parameter until the refrigerant circulation amount of the air conditioner is kept stable, and filling the air conditioner with the refrigerant;
judging the refrigerant charge of the air conditioner according to the second operation parameter;
wherein the first operating parameter is an operating parameter related to the refrigerant circulation amount, and the second operating parameter is an operating parameter related to the refrigerant charge amount;
when the outdoor environment temperature is less than or equal to a temperature threshold value, selecting the compressor frequency and the fan rotating speed of the air conditioner as the first operation parameters, and selecting the high-pressure temperature of the air conditioner as the second operation parameters;
selecting the compressor frequency of the air conditioner as the first operation parameter and selecting the opening degree of an expansion valve of an indoor unit of the air conditioner as the second operation parameter under the condition that the outdoor environment temperature is greater than a first temperature threshold;
the determining, according to the second operation parameter, the refrigerant charge of the air conditioner includes:
under the condition that the high-pressure temperature falls into a first temperature interval, judging that the refrigerant charge is proper;
determining that the refrigerant charge is insufficient when the high pressure temperature is lower than a lower limit value of a first temperature section; when the high-pressure temperature is higher than the upper limit value of the first temperature section, it is determined that the refrigerant charge amount is excessive.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the first operating parameter is selected from one or a combination of the following: compressor frequency, fan speed; and/or
The second operating parameter is selected from one or a combination of the following: high pressure temperature, opening degree of expansion valve of indoor unit and supercooling degree.
3. The method of claim 1, wherein a lower limit value and an upper limit value of the first temperature interval are respectively linearly related to the outdoor ambient temperature.
4. A method according to claim 3, wherein the first temperature interval is obtained by the following formula:
T1＝a1+b1×Tao，T2＝a2+b2×Tao；
wherein T1 is the lower limit value of the first temperature interval, T2 is the upper limit value of the first temperature interval, tao is the outdoor environment temperature, a1 is more than or equal to 29 and less than or equal to 29.5, a2 is more than or equal to 34 and less than or equal to 34.5,1.3, b1 is more than or equal to 1.35,1.3 and b2 is more than or equal to 1.35.
5. The method of claim 1, wherein said determining the refrigerant charge of the air conditioner based on the second operating parameter comprises:
when the opening of the expansion valve of the indoor unit falls into a valve opening section, judging that the refrigerant filling amount is proper; and/or
Determining that the refrigerant charge is insufficient when the indoor unit expansion valve opening is lower than a lower limit value of a valve opening section; and/or
When the indoor unit expansion valve opening is higher than the upper limit value of the valve opening section, it is determined that the refrigerant charge amount is excessive.
6. The method of claim 5, wherein a lower limit value and an upper limit value of the valve opening interval are linearly related to an indoor environment temperature of the air conditioner, respectively.
7. The method of claim 6, wherein the linear relationship between the valve opening interval and the indoor ambient temperature is: m1=a3+b3×t inner ring, m2=a4+b4×t inner ring;
wherein M1 is the lower limit value of the valve opening interval, M2 is the upper limit value of the valve opening interval, the T inner ring is the outdoor environment temperature, a3 is more than or equal to 99 and less than or equal to 101, a4 is more than or equal to 34 and less than or equal to 36,2.2, b3 is more than or equal to 2.4,6.9 and b4 is more than or equal to 7.1.
8. A control method for refrigerant charge of an air conditioner, the control method comprising:
determining a refrigerant charge amount of the air conditioner using the determination method according to any one of claims 1 to 7;
when the refrigerant charge amount is determined to be appropriate, the charging is stopped after the target charging time is continued.
9. An air conditioner comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the determination method according to any one of claims 1 to 7.
10. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the steps of the decision method according to any of claims 1 to 7.
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