CN116892778A - Air conditioner control method and device, storage medium and air conditioner - Google Patents
Air conditioner control method and device, storage medium and air conditioner Download PDFInfo
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- CN116892778A CN116892778A CN202310739020.XA CN202310739020A CN116892778A CN 116892778 A CN116892778 A CN 116892778A CN 202310739020 A CN202310739020 A CN 202310739020A CN 116892778 A CN116892778 A CN 116892778A
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- 230000006835 compression Effects 0.000 claims abstract description 81
- 238000007906 compression Methods 0.000 claims abstract description 81
- 230000002265 prevention Effects 0.000 claims abstract description 72
- 238000010438 heat treatment Methods 0.000 claims description 59
- 238000012937 correction Methods 0.000 claims description 24
- 230000009467 reduction Effects 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 6
- 230000001174 ascending effect Effects 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 48
- 230000001276 controlling effect Effects 0.000 description 18
- 238000010586 diagram Methods 0.000 description 15
- 239000003507 refrigerant Substances 0.000 description 10
- 239000010729 system oil Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 238000004378 air conditioning Methods 0.000 description 8
- 238000007664 blowing Methods 0.000 description 8
- 230000001186 cumulative effect Effects 0.000 description 8
- 230000006870 function Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
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- 238000001704 evaporation Methods 0.000 description 5
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- 238000005859 coupling reaction Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 239000010725 compressor oil Substances 0.000 description 2
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- 229920006395 saturated elastomer Polymers 0.000 description 2
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Classifications
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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
- F24F11/50—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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method and device of an air conditioner, a storage medium and the air conditioner, wherein the method comprises the following steps: after the air conditioner heats and starts up and enters cold air prevention control, judging whether the air conditioner meets the condition of exiting the cold air prevention control and whether the air conditioner is in a compressor frequency stay control stage; when judging that the condition of exiting cold air prevention control is met and the condition is in a compressor frequency stay control stage, judging whether the tube temperature of an indoor heat exchanger of the air conditioner is smaller than or equal to a second preset temperature value; if the pipe temperature of the indoor heat exchanger is judged to be smaller than or equal to the second preset temperature value, increasing the opening of a throttling element of the air conditioner according to the temperature rise rate of the pipe temperature of the indoor heat exchanger; after the opening degree of a throttling element of the air conditioner is increased, judging whether liquid compression occurs according to the suction superheat degree of the compressor; if the compressor of the air conditioner is judged to generate liquid compression, the opening degree of a throttling element of the air conditioner is reduced so as to improve the suction superheat degree of the compressor. The scheme provided by the invention can improve the reliability of the compressor.
Description
Technical Field
The present invention relates to the field of control, and in particular, to a control method and apparatus for an air conditioner, a storage medium, and an air conditioner.
Background
When the heat pump air conditioner is used for heating in winter, the lower the outdoor environment temperature is, the higher the requirements on the running reliability and the comfort of the air conditioner are. On one hand, the air conditioner operates under high load under a low-temperature working condition, the oil return state of an air conditioning system is poor, the phenomenon of oil shortage or oil empty of a compressor is easy to occur, the reliability of the air conditioner is reduced, and the service life of the air conditioner is prolonged; on the other hand, the heating temperature rise rate of the air conditioner is low under the low-temperature working condition, the air outlet temperature of the air conditioner is low when the air conditioner is just started, and hidden dangers of heating and blowing cold air exist, so that users are uncomfortable to use.
The related art sets a frequency stay platform in the starting and frequency raising process of the compressor, so that the air conditioner continues to raise the frequency after maintaining a certain frequency to run for a certain time, the oil return condition of the compressor is improved, and the low-temperature running reliability of the air conditioner is improved. Meanwhile, the heating cold air prevention control function is designed, the compressor is started until the temperature of the inner pipe of the air conditioner rises to a certain value, and then the inner fan is started, so that the air outlet temperature of the air conditioner is ensured not to be too low, and the comfort of a user is improved. However, the above-mentioned technical solution has the following problems:
the compressor oil return reliability control technology and the cold air prevention control technology lack of coupling control, and the method for guaranteeing the reliability of the air conditioner is single, and the air conditioner cannot blow hot air rapidly due to the limitation of the output of the air conditioner heat earlier stage capacity only by the compressor frequency stay control technology in the frequency raising stage.
Disclosure of Invention
The invention aims to overcome the defects of the related art and provide a control method and device of an air conditioner, a storage medium and the air conditioner, so as to solve the problem that the reliability of a system of the air conditioner in the related art is reduced under the condition of large heat output.
In one aspect, the present invention provides a control method of an air conditioner, including: after the air conditioner is heated and started and enters cold air prevention control, judging whether the air conditioner meets the condition of exiting the cold air prevention control and whether the air conditioner is in a compressor frequency stay control stage; the compressor frequency stay control means that in the frequency raising process after the compressor is started, the compressor is kept at a set frequency for a set time, and then frequency raising is continued; the set frequency is recorded as the stay point frequency of the compressor frequency stay control, and the set time is recorded as the stay time of the compressor frequency stay control; when judging that the air conditioner meets the condition of exiting cold air prevention control and the air conditioner is in a compressor frequency stay control stage, judging whether the tube temperature of an indoor heat exchanger of the air conditioner is smaller than or equal to a second preset temperature value; if the pipe temperature of the indoor heat exchanger is judged to be smaller than or equal to a second preset temperature value, increasing the opening of a throttling element of the air conditioner according to the temperature rise rate of the pipe temperature of the indoor heat exchanger, wherein the increased opening of the throttling element is recorded as a first opening, and the increased opening is equal to the opening after the increase minus the opening before the increase; after the opening degree of a throttling element of the air conditioner is increased, judging whether liquid compression occurs to the compressor of the air conditioner according to the suction superheat degree of the compressor of the air conditioner; and if the compressor of the air conditioner is judged to generate liquid compression, reducing the opening of a throttling element of the air conditioner to improve the suction superheat degree of the compressor, wherein the reduced opening of the throttling element is recorded as a second opening, and the reduced opening is equal to the opening before reduction minus the opening after reduction.
Optionally, determining whether the air conditioner meets a condition of exiting cold air prevention control includes: judging whether the tube temperature of the indoor heat exchanger of the air conditioner is greater than or equal to a first preset temperature value, and if so, determining that the air conditioner meets the condition of exiting cold air prevention control; and/or judging whether the air conditioner is in a compressor frequency stay control stage, comprising: if the accumulated running time length of the compressor of the air conditioner is longer than the preset time length and is smaller than or equal to the sum of the accumulated running time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control, determining that the air conditioner is in a compressor frequency residence control stage; and/or increasing the opening degree of a throttling element of the air conditioner according to the temperature rise rate of the tube temperature of the indoor heat exchanger, comprising: determining a section in which the temperature rise rate of the tube temperature of the indoor heat exchanger is located in more than two preset temperature rise rate sections, wherein each section in the more than two preset temperature rise rate sections corresponds to an opening increment; determining the opening increment of a throttling element of the air conditioner according to the opening increment corresponding to the interval in which the temperature rise rate of the tube temperature of the indoor heat exchanger is located in the preset more than two temperature rise rate intervals; increasing the opening of the throttling element of the air conditioner according to the determined opening increment of the throttling element of the air conditioner; and/or, judging whether the compressor of the air conditioner generates liquid compression according to the suction superheat degree of the compressor of the air conditioner, including: judging whether the compressor of the air conditioner is subjected to liquid compression or not according to the relationship between the suction superheat degree of the compressor and a preset superheat degree value; and if the suction superheat degree is larger than the preset superheat value, judging that the compressor does not generate liquid compression.
Optionally, the method further comprises: when judging that the air conditioner meets the condition of exiting cold air prevention control, but the air conditioner is not in a compressor frequency stay control stage, controlling the air conditioner to maintain the heating operation in the current state; wherein, the condition that the air conditioner is not in the compressor frequency stay control stage includes: the accumulated running time length of the compressor of the air conditioner is smaller than or equal to a preset time length, and/or the accumulated running time length of the compressor of the air conditioner is larger than the sum of the accumulated running time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control; and/or when the air conditioner meets the condition of exiting the compressor frequency residence control, controlling the air conditioner to resume normal heating operation; the conditions for exiting compressor frequency dwell control include: the accumulated running time length of the compressor is longer than the sum of the accumulated running time length of the compressor and the stay time length of the compressor frequency stay control when entering the compressor frequency stay control; and/or if the compressor of the air conditioner is judged to generate liquid compression, after the opening of the throttling element of the air conditioner is reduced, judging the magnitude relation between the opening difference value of the first opening and the second opening and the preset opening difference value; if the opening difference value of the first opening and the second opening is smaller than or equal to a preset opening difference value, the frequency of the compressor is adjusted according to the current suction pressure of the compressor and the temperature rise rate of the tube temperature of the indoor heat exchanger; and/or if the compressor of the air conditioner is judged not to have liquid compression, correcting the stay time of the stay control of the compressor frequency according to the current opening of the throttling element and the compressor frequency of the air conditioner.
Optionally, the residence time of the compressor frequency residence control is determined according to the outdoor environment temperature, including: determining a temperature interval in which the outdoor environment temperature is located in more than two preset temperature intervals; wherein each of the preset two or more temperature intervals corresponds to a duration; determining the residence time of the air conditioner for controlling the compressor frequency residence at present according to the time corresponding to the outdoor environment temperature in the temperature intervals of more than two preset temperature intervals; and/or the accumulated operation duration of the compressor when entering the compressor frequency stay control is determined according to the initial starting frequency of the compressor, the duration of the starting stage of the compressor and the frequency raising rate of the compressor; wherein, the accumulated operation time s of the compressor when entering the compressor frequency stay control 1 The calculation formula of (2) is as follows:
s 1 ＝(F 1 -F start )/v+s other
wherein F is 1 Dwell point frequency, F, for compressor frequency dwell control start For starting initial frequency of compressor s other V is the compressor for the duration of the compressor start-up phaseIs a frequency-up rate of (2); and/or, further comprising: resetting the first opening after adjusting the frequency of the compressor, so as to judge the magnitude relation between the opening difference value of the first opening and the second opening and the preset opening difference value again after reducing the opening of a throttling element of the air conditioner under the condition that the compressor of the air conditioner is judged to generate liquid compression; and/or correcting the stay time of the stay control of the compressor frequency according to the current opening of the throttling element and the compressor frequency of the air conditioner, wherein the method comprises the following steps: determining a correction duration according to the current opening of a throttling element of the air conditioner and the frequency of the compressor, and correcting the stay duration of the frequency stay control of the compressor according to the determined correction duration; and the corrected residence time is equal to the residence time of the current compressor frequency residence control of the air conditioner minus the corrected residence time.
Another aspect of the present invention provides a control apparatus of an air conditioner, including: the first judging unit is used for judging whether the air conditioner meets the condition of exiting cold air prevention control or not and whether the air conditioner is in a compressor frequency stay control stage or not after the air conditioner is heated and started and enters cold air prevention control; the compressor frequency stay control means that in the frequency raising process after the compressor is started, the compressor is kept at a set frequency for a set time, and then frequency raising is continued; the set frequency is recorded as the stay point frequency of the compressor frequency stay control, and the set time is recorded as the stay time of the compressor frequency stay control; the second judging unit is used for judging whether the tube temperature of the indoor heat exchanger of the air conditioner is smaller than or equal to a second preset temperature value when the first judging unit judges that the air conditioner meets the condition of exiting cold air prevention control and the air conditioner is in a compressor frequency stay control stage; a control unit, configured to increase the opening of a throttling element of the air conditioner according to the rate of temperature rise of the indoor heat exchanger tube temperature if the second judging unit judges that the indoor heat exchanger tube temperature is less than or equal to a second preset temperature value, where the increased opening of the throttling element is recorded as a first opening, and the increased opening is equal to the increased opening minus the opening before the increase; a third judging unit, configured to judge whether liquid compression occurs in the compressor of the air conditioner according to the suction superheat degree of the compressor of the air conditioner after the control unit increases the opening degree of the throttling element of the air conditioner; the control unit is further configured to: and if the third judging unit judges that the liquid compression occurs in the compressor of the air conditioner, reducing the opening of a throttling element of the air conditioner to improve the suction superheat degree of the compressor, wherein the reduced opening of the throttling element is recorded as a second opening, and the reduced opening is equal to the opening before reduction minus the opening after reduction.
Optionally, the first judging unit judges whether the air conditioner meets a condition of exiting cold air prevention control, including: judging whether the tube temperature of the indoor heat exchanger of the air conditioner is greater than or equal to a first preset temperature value, and if so, determining that the air conditioner meets the condition of exiting cold air prevention control; and/or, the first judging unit judges whether the air conditioner is in a compressor frequency stay control stage, including: if the accumulated running time length of the compressor of the air conditioner is longer than the preset time length and is smaller than or equal to the sum of the accumulated running time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control, determining that the air conditioner is in a compressor frequency residence control stage; and/or, the control unit increases the opening of the throttling element of the air conditioner according to the temperature rise rate of the tube temperature of the indoor heat exchanger, and the control unit comprises: determining a section in which the temperature rise rate of the tube temperature of the indoor heat exchanger is located in more than two preset temperature rise rate sections, wherein each section in the more than two preset temperature rise rate sections corresponds to an opening increment; determining the opening increment of a throttling element of the air conditioner according to the opening increment corresponding to the interval in which the temperature rise rate of the tube temperature of the indoor heat exchanger is located in the preset more than two temperature rise rate intervals; increasing the opening of the throttling element of the air conditioner according to the determined opening increment of the throttling element of the air conditioner; and/or, the third judging unit judges whether the liquid compression occurs to the compressor of the air conditioner according to the suction superheat degree of the compressor of the air conditioner, and the third judging unit comprises: judging whether the compressor of the air conditioner is subjected to liquid compression or not according to the relationship between the suction superheat degree of the compressor and a preset superheat degree value; and if the suction superheat degree is larger than the preset superheat value, judging that the compressor does not generate liquid compression.
Optionally, the control unit is further configured to: when judging that the air conditioner meets the condition of exiting cold air prevention control, but the air conditioner is not in a compressor frequency stay control stage, controlling the air conditioner to maintain the heating operation in the current state; wherein, the condition that the air conditioner is not in the compressor frequency stay control stage includes: the accumulated running time length of the compressor of the air conditioner is smaller than or equal to a preset time length, and/or the accumulated running time length of the compressor of the air conditioner is larger than the sum of the accumulated running time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control; and/or, the control unit is further configured to: when the air conditioner meets the condition of exiting the compressor frequency residence control, controlling the air conditioner to resume normal heating operation; the conditions for exiting compressor frequency dwell control include: the accumulated running time length of the compressor is longer than the sum of the accumulated running time length of the compressor and the stay time length of the compressor frequency stay control when entering the compressor frequency stay control; and/or, the control device further comprises: a fourth judging unit, configured to judge, if the third judging unit judges that liquid compression occurs in the compressor of the air conditioner, a magnitude relationship between an opening difference value between the first opening and the second opening and a preset opening difference value after reducing an opening of a throttling element of the air conditioner; the adjusting unit is used for adjusting the frequency of the compressor according to the current suction pressure of the compressor and the temperature rise rate of the tube temperature of the indoor heat exchanger if the fourth judging unit judges that the opening difference value of the first opening and the second opening is smaller than or equal to the preset opening difference value; and/or, further comprising: and the correction unit is used for correcting the stay time of the compressor frequency stay control according to the current opening degree of the throttling element and the compressor frequency of the air conditioner if the third judgment unit judges that the compressor of the air conditioner does not generate liquid compression.
Optionally, the control device further includes: the first determining unit is configured to determine a residence time of the compressor frequency residence control, where the residence time of the compressor frequency residence control is determined according to an outdoor environment temperature, and includes: determining a temperature interval in which the outdoor environment temperature is located in more than two preset temperature intervals; wherein each of the preset two or more temperature intervals corresponds to a duration; determining the residence time of the air conditioner for controlling the compressor frequency residence at present according to the time corresponding to the outdoor environment temperature in the temperature intervals of more than two preset temperature intervals; and/or, the control device further comprises: the second determining unit is used for determining the accumulated operation duration of the compressor when the compressor frequency stay control is entered according to the initial starting frequency of the compressor, the duration of the starting stage of the compressor and the ascending frequency rate of the compressor; wherein, the accumulated operation time s of the compressor when entering the compressor frequency stay control 1 The calculation formula of (2) is as follows:
s 1 ＝(F 1 -F start )/v+s other
wherein F is 1 Dwell point frequency, F, for compressor frequency dwell control start For starting initial frequency of compressor s other V is the frequency raising rate of the compressor; and/or, the control device further comprises: the resetting unit is used for resetting the first opening after the adjusting unit adjusts the frequency of the compressor, so that the fourth judging unit judges the magnitude relation between the opening difference value of the first opening and the second opening and the preset opening difference value again after the control unit reduces the opening of the throttling element of the air conditioner under the condition that the third judging unit judges that the compressor of the air conditioner is in liquid compression; and/or, the correcting unit corrects the stay time of the stay control of the compressor frequency according to the current opening of the throttling element and the compressor frequency of the air conditioner, and the correcting unit comprises: determining a correction time length according to the current throttle opening of the air conditioner and the frequency of the compressor, and correcting the air conditioner according to the determined correction time lengthThe dwell time of the compressor frequency dwell control; and the corrected residence time is equal to the residence time of the current compressor frequency residence control of the air conditioner minus the corrected residence time.
In a further aspect the invention provides a storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.
In a further aspect the invention provides an air conditioner comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any of the methods described hereinbefore when the program is executed.
In still another aspect, the present invention provides an air conditioner, including a control device of any one of the foregoing air conditioners.
According to the technical scheme, when the heating operation exits cold air prevention and is in the frequency residence control stage, according to the temperature change of the inner pipe and the temperature change rate of the inner pipe, the opening degree of the throttling element is regulated and controlled to increase the air conditioning capacity output, improve the system oil return, improve the air outlet temperature of the air conditioner, shorten the residence time of constant frequency operation, simultaneously, carry out hydraulic compression identification and control through the air suction dryness of the compressor, and simultaneously, avoid the compressor from generating liquid compression while controlling the frequency and the opening degree of the throttling element to increase the heat output of the air conditioner in parallel, and improve the heating comfort of a user and the operation reliability of the compressor. On the premise of meeting the requirement of rapid hot air blowing of air conditioning heat, the problem that the reliability of an air conditioning system is reduced under the condition of large heat output of the existing air conditioner is solved, comfortable and reliable operation of the air conditioner is realized, and user experience is improved.
According to the technical scheme, the system reliability is comprehensively controlled by utilizing a plurality of parameters, the problem that the heating comfort is poor due to single reliability control means of the existing compressor can be solved, the reliability problems of oil shortage or oil empty, hydraulic compression and the like of the compressor are avoided while the large capacity output of the air conditioner and the rapid heating operation are ensured, the heating comfort of a user is improved to the maximum extent, and the service life of the compressor is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a schematic diagram of a control method of an air conditioner according to an embodiment of the present invention;
FIG. 2 shows a flow chart of steps of one embodiment;
fig. 3 is a schematic method diagram of another embodiment of a control method of an air conditioner according to the present invention;
fig. 4 is a method schematic diagram of a further embodiment of a control method of an air conditioner according to the present invention;
fig. 5 is a schematic method diagram of a further embodiment of a control method of an air conditioner according to the present invention;
FIG. 6 is an air conditioner operation control logic of the present invention;
FIG. 7 is compressor reliability control logic according to the present invention;
FIG. 8 is a block diagram illustrating an embodiment of a control apparatus for an air conditioner according to the present invention;
fig. 9 is a block diagram of another embodiment of a control device of an air conditioner according to the present invention;
fig. 10 is a block diagram of a control device of an air conditioner according to still another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The related art sets a frequency stay platform in the starting and frequency raising process of the compressor, so that the air conditioner continues to raise the frequency after maintaining a certain frequency to run for a certain time, the oil return condition of the compressor is improved, and the low-temperature running reliability of the air conditioner is improved. Meanwhile, the heating cold air prevention control function is designed, the compressor is started until the temperature of the inner pipe of the air conditioner rises to a certain value, and then the inner fan is started, so that the air outlet temperature of the air conditioner is ensured not to be too low, and the comfort of a user is improved.
However, the above-mentioned technical solution has the following problems: the compressor oil return reliability control technology and the cold air prevention control technology lack of coupling control, and the method for guaranteeing the reliability of the air conditioner is single, and the air conditioner cannot blow hot air rapidly due to the limitation of the output of the air conditioner heat earlier stage capacity only by the compressor frequency stay control technology in the frequency raising stage. Meanwhile, when the frequency stay control of the compressor occurs after the cold air prevention control exits, hidden danger of cold air blowing exists, and the user experience is affected. The air conditioner is characterized in that in the low-temperature heating starting frequency-raising stage of the air conditioner, the initial temperature of a room is low, the heat output of the air conditioner is less, the temperature of an inner pipe is slowly raised, and the temperature of an air outlet can be quickly lowered due to the fact that the inner fan is directly started at the moment, so that the temperature of the inner pipe is required to be higher than the temperature of a target pipe (for example, 40 ℃) to recover the normal running wind shield. However, when the temperature of the inner pipe is just higher than the target pipe temperature but the compressor is in the frequency stay stage, the heat output of the air conditioner is not increased in real time at the moment, and the air shield of the inner fan is increased rapidly, so that the temperature of the inner pipe and the air outlet temperature are continuously reduced, and the cold air prevention effect is poor, for example, the inner 0 ℃/outer-5 ℃ working condition is used for heating operation, the related technical scheme enters the frequency stay control after the compressor is operated for 160 seconds in a cumulative way, and the air conditioner is withdrawn for cold air prevention in 190 seconds, at the moment, the temperature of the inner pipe is reduced from 40 ℃ to 28 ℃ rapidly, the air outlet temperature is reduced to 18-20 ℃, and the air outlet temperature is reduced.
The invention provides a control method of an air conditioner.
Fig. 1 is a schematic diagram of a control method of an air conditioner according to an embodiment of the present invention.
As shown in fig. 1, the control method at least includes step S110, step S120, step S130, step S140, and step S150 according to an embodiment of the present invention.
Step S110, after the air conditioner heats and starts up and enters cold air prevention control, judging whether the air conditioner meets the condition of exiting the cold air prevention control and whether the air conditioner is in a compressor frequency stay control stage.
The compressor frequency stay control means that in the frequency raising process after the compressor is started, the compressor is kept at a set frequency for a set time, and then frequency raising is continued; the set frequency is recorded as the stay point frequency of the compressor frequency stay control, and the set time is recorded as the stay time of the compressor frequency stay control.
In one specific embodiment, determining whether the air conditioner satisfies a condition for exiting cold air prevention control includes: judging the tube temperature T of an indoor heat exchanger of the air conditioner s Whether or not it is greater than or equal to a first preset temperature value T 1 If the tube temperature T of the indoor heat exchanger is judged s Greater than or equal to a first preset temperature value T 1 And determining that the air conditioner meets the condition of exiting the cold air prevention control.
Specifically, the tube temperature (simply called as the inner tube temperature) T of the indoor heat exchanger of the air conditioner is detected and recorded in real time s Judging tube temperature T of indoor heat exchanger of air conditioner s And a preset temperature value T 1 The relation of the first preset temperature value T 1 The target inner tube temperature of the indoor heat exchanger which is out of the cold air prevention control is obtained. If T s Less than T 1 The pipe temperature of the indoor heat exchanger of the air conditioner is low, and the air outlet temperature of the air conditioner is low, so that the current internal fan is kept to be closed or the running state of low rotating speed is maintained, and cold air is prevented from being directly blown;if T s Greater than or equal to T 1 The temperature of the heat exchanger tube in the air conditioner indoor is higher, and when the air conditioner indoor heat exchanger tube reaches the exiting cold air prevention control condition, the cold air prevention control is performed, and the inner fan is changed into the set wind gear operation.
In one embodiment, determining whether the air conditioner is in a compressor frequency dwell control phase includes: if the accumulated running time s of the compressor of the air conditioner is longer than the preset time s 0 And is less than or equal to the accumulated operating time s of the compressor when entering the compressor frequency stay control 1 And determining that the air conditioner is in the compressor frequency stay control stage if the sum of the stay time t and the compressor frequency stay control is the sum of the stay time t.
The air conditioner is heated and started to run, cold air prevention control is carried out, the inner fan is closed or runs according to a set low rotation speed, and the outdoor environment temperature T is detected and recorded w Indoor environment temperature T n Calculating the temperature difference delta t=t between the indoor environment temperature and the outdoor environment temperature (simply referred to as indoor-outdoor temperature difference) n -T w . According to the outdoor environment temperature T w Determining the dwell point frequency F of the compressor frequency dwell control by the temperature difference delta T between the indoor environment temperature and the outdoor environment temperature 1 According to the outdoor environment temperature T w Determining the stay time t of the compressor frequency stay control, wherein the stay time is the time for controlling the compressor frequency to be kept at a frequency stay point when the compressor frequency stay control is carried out; dwell point frequency F 1 ＝c 1 T w +c 2 ΔT+c 3 ，c 1 、c 2 、c 3 Is a fitting coefficient, and is obtained by designing an orthogonal verification experiment to obtain data fitting.
The stay time T of the compressor frequency stay control is controlled according to the outdoor environment temperature T w Determining, determining the outdoor environment temperature T w In the temperature interval of more than two preset temperature intervals, wherein each of the more than two preset temperature intervals corresponds to a duration, namely according to the outdoor environment temperature T w Determining the stopping of the air conditioner for controlling the compressor frequency stopping at present according to the duration corresponding to the temperature interval in which more than two preset temperature intervals are locatedAnd a time period t is reserved.
For example, (1) when T w When the value is less than A, the corresponding stay time is t 1 The method comprises the steps of carrying out a first treatment on the surface of the (2) When A is less than or equal to T w When B is less than or equal to B, the corresponding stay time is t 2 The method comprises the steps of carrying out a first treatment on the surface of the (3) When T is w When B is more than zero, the corresponding stay time is t 3 The method comprises the steps of carrying out a first treatment on the surface of the For example, a= -7 ℃, b= 18 ℃, t 1 、t 2 、t 3 120s, 30s, 0s, respectively.
When the outdoor environment temperature T w When the temperature difference delta T between the indoor and the outdoor is lower and is larger, the oil return state of the system is poor, and the stay point frequency F of the compressor 1 The lower the residence time t is, the longer the residence time t is, the lower the oil discharge rate of the compressor is, the longer the oil return time is, and the system oil return is improved.
Preferably, the dwell point frequency F of the compressor frequency dwell control is determined 1 Minimum value F of frequency of stop point of compressor min When F is 1 ＜F min F is then 1 Taking F min And the reduction of the reliability of the air conditioner caused by the slow oil return rate of the compressor is avoided. When the outdoor environment temperature T w When the temperature difference delta T between the indoor and the outdoor is higher and the temperature difference delta T between the indoor and the outdoor is smaller, the oil return state of the system is good, and the stay point frequency F of the compressor 1 The higher the residence time t is, the shorter the heating quantity output is, and the indoor temperature rise rate is improved. Determination F 1 Dwell point frequency maximum F for dwell control with compressor frequency max When F is 1 ＞F max F is then 1 Taking F max The phenomenon that oil shortage or empty oil occurs in a system due to the fact that the oil discharge rate of the compressor is too high is avoided, and the operation reliability of the air conditioner is guaranteed.
Accumulated operation duration s of compressor when entering compressor frequency stay control 1 And determining according to the initial frequency of the starting of the compressor, the duration of the starting stage of the compressor and the frequency-increasing rate of the compressor.
In one embodiment, the compressor cumulative operating time s at the time of entering the compressor frequency dwell control 1 The calculation formula of (2) is as follows:
s 1 ＝(F 1 -F start )/v+s other
wherein F is 1 Stop for compressor frequency dwell controlThe dwell frequency F start For starting initial frequency (Hz), s of compressor other The duration of the compressor starting stage may include, for example, a compressor standby duration (i.e., a compressor standby starting duration), a compressor starting protection control duration, a compressor AC current or module current, or an overload protection frequency limit time; v is the rate of rise of the compressor and is a fixed parameter value.
When the air conditioner meets the condition of exiting cold air prevention control, detecting the current accumulated running duration s of the compressor, and judging the accumulated running duration s of the compressor and the preset duration s 0 And the accumulated operation time s for entering the frequency stop point of the compressor 1 Is a relationship of (2); if the accumulated running time s of the compressor of the air conditioner is longer than the preset time s 0 And is less than or equal to the accumulated operating time s of the compressor when entering the compressor frequency stay control 1 Sum of dwell time t with compressor frequency dwell control, i.e. s is greater than s 0 And less than or equal to(s) 1 +t), namely, when the air conditioner reaches the target inner pipe temperature condition of exiting cold air prevention control, the air conditioner just enters or is in the stage of compressor frequency stay control, and at the moment, the temperature of the indoor heat exchanger pipe and the air outlet temperature can be quickly reduced due to exiting cold air prevention control, so that the air conditioner enters the compressor reliability control, and the heat output of the air conditioner is improved.
When the air conditioner is judged to meet the condition of exiting cold air prevention control, but the air conditioner is not in the compressor frequency stay control stage, the air conditioner is controlled to maintain the heating operation in the current state. Wherein, the condition that the air conditioner is not in the compressor frequency stay control stage includes: the accumulated operation time length of the compressor of the air conditioner is smaller than or equal to the preset time length, and/or the accumulated operation time length of the compressor of the air conditioner is larger than the sum of the accumulated operation time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control.
That is, if the accumulated operation time s of the compressor of the air conditioner is less than or equal to the preset time s 0 The method shows that the current room has high working condition temperature, small load and high temperature rise rate, and is not easy to blow cold air, so that the normal heating operation in the current state is maintained; before the compressor is started, the tube temperature of the indoor heat exchanger is equal to the indoor temperature, and the compressor is started Stage when the indoor heat exchanger tube Wen Wensheng speed is faster than a certain value, i.e. the time to reach the exit condition is less than the preset time period s 0 The temperature is high, and cold air is not easy to blow. Preset time length s 0 May be measured experimentally or based on the velocity requirements of the inner tube Wen Wensheng. If the accumulated running time s of the compressor of the air conditioner is longer than the accumulated running time s of the compressor when entering the compressor frequency stay control 1 The sum of the dwell time t with the compressor frequency dwell control, i.e. s is greater than (s 1 +t), namely the compressor exits the frequency stop control, the air conditioner is in the frequency raising stage of the compressor, and the heating capacity is continuously increased, so that the normal heating operation in the current state is maintained.
And step S120, judging whether the tube temperature of the indoor heat exchanger of the air conditioner is smaller than or equal to a second preset temperature value when the air conditioner is judged to meet the condition of exiting cold air prevention control and the air conditioner is in a compressor frequency stay control stage.
Specifically, when it is determined that the air conditioner satisfies the condition of exiting the cold air prevention control and the air conditioner is in the compressor frequency stay control stage, the compressor reliability control is entered, i.e., steps S120 to S150. After entering the compressor reliability control, detecting the tube temperature T of the indoor heat exchanger of the air conditioner s Judging the tube temperature T of the indoor heat exchanger s And a second preset temperature value T 2 Is a size relationship of (a). If T s Greater than T 2 The inner pipe temperature is slow in descending speed after the normal wind gear is restored, and the air outlet temperature is still higher, so that the current state operation is continuously maintained; if T s Less than or equal to T 2 I.e. the temperature of the inner pipe is rapidly reduced after the normal wind gear is restored, and the hidden danger of blowing cold wind exists.
And step S130, if the tube temperature of the indoor heat exchanger is judged to be smaller than or equal to a second preset temperature value, increasing the opening of the throttling element of the air conditioner according to the temperature rise rate of the tube temperature of the indoor heat exchanger.
The throttling element can be a throttling element between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner. For example, the temperature change value of the tube temperature of the indoor heat exchanger of the air conditioner is obtained every n seconds, and the temperature rise rate of the tube temperature of the indoor heat exchanger can be calculated.
Figure 2 shows a flow chart of the steps of one embodiment. As shown in fig. 2, step S130 includes step S131, step S132, and step S133 in one embodiment.
Step S131, determining a section in which the temperature rise rate of the tube temperature of the indoor heat exchanger is in a preset section with more than two temperature rise rates.
Step S132, determining the opening increment of the throttling element of the air conditioner according to the opening increment corresponding to the interval in which the temperature rise rate of the indoor heat exchanger tube temperature is located in the preset more than two temperature rise rate intervals.
Step S133, increasing the opening of the throttling element of the air conditioner according to the determined opening increment of the throttling element of the air conditioner.
Wherein each of the preset two or more temperature rise rate intervals corresponds to an opening increment; namely, the opening increment corresponding to the interval in which the temperature rise rate of the indoor heat exchanger tube temperature is in the preset more than two temperature rise rate intervals is determined as the opening increment of the throttling element of the air conditioner. The opening degree to which the throttle element increases (i.e., the opening degree increment, the increased opening degree being equal to the opening degree after the increase minus the opening degree before the increase) is noted as a first opening degree.
For example, the temperature rise rate v of the tube temperature of the indoor heat exchanger T . When v T Less than v 1 When the inner tube temperature drops too fast, the opening delta k of the electronic expansion valve is increased 1 The method comprises the steps of carrying out a first treatment on the surface of the When v 1 ≤v T ≤v 2 When the inner tube temperature is slowly reduced, the opening delta k of the electronic expansion valve is increased 2 ，Δk 1 ＞Δk 2 The method comprises the steps of carrying out a first treatment on the surface of the When v T ＞v 2 When the inner tube temperature is extremely slow to drop or the tube temperature is increased, the opening increment of the electronic expansion valve is 0.
In another specific embodiment, according to the tube temperature v of the indoor heat exchanger T Determining the opening increment delta k of the throttling element of the air conditioner according to a preset opening increment calculation formula 1 The method comprises the steps of carrying out a first treatment on the surface of the According to the determined opening delta k of the throttling element of the air conditioner 1 Increase in sizeOpening degree of a throttling element of the air conditioner. The opening degree to which the throttle element increases (i.e., the opening degree increment) is noted as a first opening degree. The opening increment calculation formula is as follows: Δk 1 ＝c 4 v T +c 5 The method comprises the steps of carrying out a first treatment on the surface of the Wherein c 4 ,c 5 The fitting coefficient can be obtained by designing an orthogonal verification experiment to obtain data fitting.
Step S140, after increasing the opening of the throttling element of the air conditioner, determining whether the liquid compression occurs in the compressor of the air conditioner according to the suction superheat degree of the compressor of the air conditioner.
And detecting the suction temperature Ti and suction pressure Pi of the compressor, inquiring the saturation temperature corresponding to the suction pressure according to the suction pressure Pi, and obtaining the suction superheat degree delta Ti of the compressor according to the difference value of the saturation temperatures corresponding to the suction temperature Ti and the suction pressure, thereby judging whether the liquid compression occurs to the compressor of the air conditioner according to the suction superheat degree delta Ti of the compressor.
In a specific embodiment, judging whether the compressor of the air conditioner performs liquid compression according to the relationship between the suction superheat degree delta Ti of the compressor and a preset superheat value epsilon; and if the suction superheat degree is smaller than or equal to the preset superheat value epsilon, judging that liquid compression of the compressor occurs. And if the suction superheat degree is larger than the preset superheat value epsilon, judging that the liquid compression of the compressor does not occur. The preset superheat value epsilon is a preset suction superheat critical value of liquid compression of the compressor. The range of values of the preset superheat value epsilon can comprise-1 ℃ to 0 ℃ for example.
Specifically, the suction temperature Ti and suction pressure pi of the compressor are detected, and the suction superheat Δti of the compressor is calculated from the suction temperature Ti and suction pressure pi. If the suction superheat degree delta Ti of the compressor is smaller than or equal to a preset superheat value epsilon, namely the suction dryness of the compressor is smaller than 1, the compressor has a liquid impact risk. If Δti is greater than ε, i.e., the compressor suction dryness is greater than 1, the air conditioner does not have liquid compression. The air suction dryness of the compressor is smaller than 1, which means that the refrigerant state of the air suction opening of the compressor is in a gas-liquid two-phase state, and liquid refrigerant is contained and enters the compressor to generate liquid compression. When the suction dryness is greater than 1, the suction port is overheated and does not contain liquid refrigerant, so that there is no possibility of liquid compression.
Given that the refrigerant saturated liquid enthalpy hin, l, saturated gaseous enthalpy hin, v at the air conditioner evaporating pressure (or suction pressure) Pin, and the enthalpy of the compressor suction refrigerant is hin =f (Pin, tin), the suction dryness is x= (hin-hin, l)/(hin, v-hin, l).
And step S150, if the compressor of the air conditioner is judged to generate liquid compression, the opening degree of a throttling element of the air conditioner is reduced so as to improve the suction superheat degree of the compressor.
If the liquid compression of the compressor is judged, the opening degree of a throttling element of the air conditioner is reduced so as to increase the throttling to improve the suction superheat degree of the compressor, thereby ensuring the reliability of the compressor. The opening degree of the air conditioner with the reduced throttle element is recorded as a second opening degree delta k 2 。
Specifically, after each reduction of the preset opening (for example, each reduction of the throttling element by 2 steps), judging whether the compressor of the air conditioner is subjected to liquid compression according to the magnitude relation between the suction superheat degree Δti of the compressor and the preset superheat value epsilon, if the liquid compression still exists, reducing the preset opening again until the suction superheat degree Δti of the compressor is judged to be greater than the preset superheat value epsilon, that is, if the liquid compression does not exist, recording the accumulated reduced opening as a second opening Δk 2 。
Fig. 3 is a schematic diagram of a method of another embodiment of a control method of an air conditioner according to the present invention.
As shown in fig. 3, according to another embodiment of the present invention, based on any of the above embodiments, the control method of an air conditioner further includes step S160 and step S170.
Step S160, if it is determined that the compressor of the air conditioner performs liquid compression, and after the opening of the throttling element of the air conditioner is reduced, determining a magnitude relation between the opening difference between the first opening and the second opening and a preset opening difference.
Step S170, if the opening difference between the first opening and the second opening is smaller than or equal to the preset opening difference, adjusting the frequency of the compressor according to the current suction pressure of the compressor and the temperature rise rate of the tube temperature of the indoor heat exchanger.
Specifically, if the first opening degree Δk 1 And the second opening delta k 2 Opening difference (Δk) 1 -Δk 2 ) Is smaller than or equal to the preset opening difference A, namely the difference of the opening before and after the control of the current throttling element is not large, the decrease of the inner tube temperature can not be restrained, and the decrease of the air outlet temperature is carried out according to the current air suction pressure pi of the compressor and the temperature rise rate v of the tube temperature of the indoor heat exchanger T The compressor frequency is adjusted.
In one embodiment, the compressor frequency is increased by Δf, wherein,
Δf＝c 6 pi+c 7 v T +c 8
wherein pi is the suction pressure of the compressor; v T The temperature rise rate of the tube temperature of the indoor heat exchanger is set; c 6 、c 7 、c 8 The parameters for fitting can be obtained experimentally.
When the pressure of the suction pressure pi of the compressor is higher, the evaporation temperature is higher, and the heat exchange temperature difference at the outer side of the heating chamber is smaller, the delta f is larger, so that the heat exchange efficiency and the suction superheat degree can be improved through frequency raising under the condition of poor heat exchange per se, and the requirements of improving the reliability and the capacity of the compressor are met; on the contrary, when the suction pressure pi of the compressor is smaller, the Δf is smaller, so that the air conditioner energy efficiency is prevented from being greatly reduced, and the suction superheat is continuously improved by reducing the opening of the throttling element.
Further, after the compressor frequency is adjusted, the first opening is reset, so that the magnitude relation between the opening difference value of the first opening and the second opening and the preset opening difference value is judged again after the opening of the throttling element of the air conditioner is reduced under the condition that the compressor of the air conditioner is judged to generate liquid compression.
Specifically, after the compressor frequency is controlled to rise by Δf, it is necessary to return to again determine whether the compressor is at risk of occurrence of a liquid hammer, and thus reset the throttle element opening increment (i.e., the first opening) Δk 1 ’＝Δk 1 -Δk 2 In Deltak 1 ' is Deltak 1 The reassigned value is then returned to again perform the compressor hydraulic compression determinationAnd (5) program.
If the first opening delta k 1 And the second opening delta k 2 Opening difference (Δk) 1 -Δk 2 ) When the difference A is larger than the preset opening difference A, the air suction dryness can be controlled directly through the throttling device at present, and the judgment of whether the liquid compression occurs to the compressor is continuously executed without adjusting the running frequency F of the compressor.
Fig. 4 is a schematic method diagram of another embodiment of a control method of an air conditioner according to the present invention.
As shown in fig. 4, according to yet another embodiment of the present invention, based on any of the above embodiments, the control method of an air conditioner further includes step S180. (FIG. 4 shows only a schematic diagram of the method of the present embodiment based on the embodiment shown in FIG. 3)
And step S180, if the compressor is judged not to have liquid compression, correcting the stay time t of the stay control of the compressor frequency according to the current opening of a throttling element and the compressor frequency of the air conditioner.
In a specific embodiment, a correction duration is determined according to the current opening of a throttling element and the frequency of the compressor of the air conditioner, and the dwell duration of the frequency dwell control of the compressor is corrected according to the determined correction duration; the corrected stay time t of the compressor frequency stay control is equal to the current stay time t of the compressor frequency stay control of the air conditioner minus the corrected time deltat, wherein the corrected time deltat is determined according to the current opening of a throttling element of the air conditioner and the compressor frequency F;
The correction period Δt=c 9 Δk+c 10 k+c 11 F+c 12 ；
Wherein Deltak is equal to the current throttling element opening k minus an initial throttling element opening k corresponding to a dwell point frequency of the compressor frequency dwell control 0 F is the compressor frequency, and when the compressor is in the frequency stay control stage, the compressor frequency is the stay point frequency of the compressor frequency control. c 9 、c 10 、c 11 、c 12 And as the fitting coefficient, the data can be obtained by designing an orthogonal verification test to obtain the final fitting.
When the delta k is larger, namely the opening of the throttling element is larger, the circulation flow of the system is higher, the return oil and the liquid are better, the correction duration delta t is larger, and the stay duration is shorter; conversely, when the smaller the Δk is, the less the system oil return becomes, the smaller the correction duration Δt is, and the stay duration cannot be too short.
The corrected amplitude deltat of the stay time is also related to the compressor frequency F, and when the compressor frequency F is larger, the oil discharge rate of the compressor is high, and the compressor needs to be fully returned with longer oil return time, the deltat is smaller. On the contrary, when the frequency F of the compressor is smaller, the oil discharge rate of the compressor is low, the oil shortage risk is reduced, and the Δt is larger, so that the air conditioner can quickly enter the heating stage for heating.
Fig. 5 is a schematic method diagram of a further embodiment of a control method of an air conditioner according to the present invention.
As shown in fig. 5, in one embodiment of the present invention, the control method of the air conditioner further includes step S190, based on any of the above embodiments.
And step S190, when the air conditioner meets the condition of exiting the compressor frequency residence control, controlling the air conditioner to resume normal heating operation.
The conditions for exiting compressor frequency dwell control include: the accumulated operation time s of the compressor is longer than the accumulated operation time s of the compressor when the compressor frequency stay control is entered 1 And the sum of dwell time of the compressor frequency dwell control.
Specifically, if the compressor cumulative operation duration s is greater than the sum of the compressor cumulative operation duration s1 at the time of entering the compressor frequency residence control and the residence duration t of the compressor frequency residence control, i.e., s is greater than(s) 1 +t), namely the time condition that the compressor reaches the stop control of the exit frequency, enters the frequency raising stage, exits the compressor reliability control program and changes to normal heating operation. If the accumulated operation time s of the compressor is smaller than or equal to the accumulated operation time s of the compressor when entering the compressor frequency stay control 1 The sum of the dwell time t with the compressor frequency dwell control, i.e. s is less than or equal to(s) 1 +t), i.e., the compressor is still in the frequency dwell control phase, the above compressor reliability control routine continues to be repeated.
In order to clearly illustrate the technical scheme of the present invention, a specific embodiment is used to describe the execution flow of the control method of the air conditioner provided by the present invention.
Fig. 6 is an air conditioner operation control logic of the present invention. As shown in fig. 6, the air conditioner is heated and started to run, enters cold air prevention control, and the inner fan is closed or maintains low rotation speed to run, and detects and records the outdoor environment temperature T w Indoor environment temperature T n Calculating the temperature difference delta t=t between the indoor environment temperature and the outdoor environment temperature (simply referred to as indoor-outdoor temperature difference) n -T w . According to the outdoor environment temperature T w Determining the stay point frequency F of the stay control of the compressor frequency by the indoor and outdoor temperature difference delta T 1 According to the outdoor environment temperature T w Determining a dwell time t of the compressor frequency dwell control, wherein the dwell point frequency F 1 ＝c 1 T w +c 2 ΔT+c 3 ，c 1 、c 2 、c 3 Is a fitting coefficient, and is obtained by designing an orthogonal verification experiment to obtain data fitting. The stay time T is according to the outdoor environment temperature T w Preset when the outdoor environment temperature T w When the temperature difference delta T between the indoor and the outdoor is lower and is larger, the oil return state of the system is poor, and the stay point frequency F of the compressor 1 The lower the residence time t is, the longer the oil discharge rate of the compressor is, the oil return time is prolonged, and the system oil return is improved. Determining compressor dwell point frequency F 1 Minimum value F of frequency of stop point of compressor min When F is 1 ＜F min F is then 1 Taking F min And the reduction of the reliability of the air conditioner caused by the slow oil return rate of the compressor is avoided. When the outdoor environment temperature T w When the temperature difference delta T between the indoor and the outdoor is higher and the temperature difference delta T between the indoor and the outdoor is smaller, the oil return state of the system is good, and the stay point frequency F of the compressor 1 The higher the residence time t is, the more the heating quantity is output, and the indoor temperature rise rate is improved. Determination F 1 With a preset maximum value F of the frequency of the stop point of the compressor max When F is 1 ＞F max F is then 1 Taking F max The phenomenon that oil shortage or empty oil occurs in a system due to the fact that the oil discharge rate of the compressor is too high is avoided, and the operation reliability of the air conditioner is guaranteed.
The method comprises the steps of obtaining the ascending frequency v of a compressor, and calculating the accumulated operation time s of the compressor when the compressor enters frequency residence control 1 The calculation formula is as follows: s is(s) 1 ＝(F 1 -F start )/v+s other
F in the formula start For starting initial frequency (Hz), s of compressor other The duration of the starting stage comprises the sum of the standby duration of the compressor (namely the standby starting duration of the compressor), the start protection control duration of the compressor and the like.
Real-time detection and record of temperature T in indoor heat exchanger of air conditioner in heating process s (simply referred to as the inner tube temperature), the inner tube temperature T of the air conditioner is first determined s And a first preset temperature value T 1 Wherein: 1) If T s Less than T 1 The temperature of the inner pipe of the air conditioner is low, and the air outlet temperature of the air conditioner is low, so that the current inner fan is kept to be closed or the running state of low rotating speed is maintained, and cold air is prevented from being blown directly; 2) If T s Greater than or equal to T 1 The temperature of the inner pipe of the air conditioner is higher, and when the air conditioner reaches the exiting cold air prevention control condition, the cold air prevention control is performed, and the inner fan is switched to set wind gear operation.
Considering that after exiting the cold air prevention function, the frequency stay control may cause insufficient heat output of the air conditioner, so that the air outlet temperature of the air conditioner is rapidly reduced after the wind gear is increased, and the air conditioning capacity output needs to be exerted to the greatest extent to improve the comfort. When the air conditioner exits the cold air prevention function, detecting and recording the current accumulated running time s of the compressor, and continuously judging the accumulated running time s of the compressor and the preset time s 0 Accumulated operation duration s of entering stop point 1 Is used in the relation of (a),
i if the accumulated running time s of the compressor is smaller than or equal to the preset time s 0 The current room working condition has high temperature, small load and high temperature rise rate, and cold air is not easy to blow, so that the normal heating operation in the current state is maintained; before the compressor is started, the temperature of the inner tube is equal to the room temperature, and in the starting stage, when the speed of the inner tube Wen Wensheng is faster than a certain value, the time for reaching the exit condition is less than or equal to s 0 The temperature is high, and cold air is not easy to blow.
ii if the accumulated running time s of the compressor is longer than the preset time s 0 And less than or equal to(s) 1 +t), namely, when the air conditioner reaches the target inner pipe temperature condition of exiting cold air prevention, the air conditioner just enters or is in the stage of controlling the frequency stay of the compressor, at the moment, the inner pipe temperature and the air outlet temperature can be rapidly reduced due to the exiting cold air prevention control, and then the air conditioner enters the reliability control of the compressor, so that the heat output of the air conditioner is improved.
iii if s is greater than(s) 1 +t), namely the air conditioner is in the stage of raising the frequency of the compressor, and the heating capacity is continuously increased, so that the normal heating operation in the current state is maintained.
Fig. 7 is compressor reliability control logic according to the present invention. As shown in fig. 7, after the air conditioner enters the compressor reliability control, the tube temperature T of the indoor heat exchanger of the air conditioner is detected and recorded s Rate of temperature rise v of inner tube temperature T First, the temperature T of the air conditioner inner pipe is determined s And a second preset temperature value T 2 Relation (T) 2 Less than T 1 )，
1) If T s Greater than T 2 The inner pipe temperature is slow in descending speed after the normal wind gear is restored, and the air outlet temperature is still higher, so that the current state operation is continuously maintained;
2) If T s Less than or equal to T 2 I.e. the temperature of the inner pipe and the temperature of the air outlet are rapidly reduced after the normal wind gear is restored, and if hidden danger of blowing cold wind exists, the temperature rise rate v of the temperature of the inner pipe of the air conditioner is continuously calculated T According to the calculated temperature rise rate v of the inner tube temperature T Determining an opening delta k of an air conditioner throttling element 1 。
When the temperature rise rate is negative (indicating a decrease in tube temperature), the expansion valve opening increases by Δk 1 The circulation flow of the system is increased, the heat is improved, and the oil return reliability of the compressor is improved. The greater the rate of temperature drop, Δk 1 The larger the smaller the opposite.
However, it is necessary to avoid the compressor liquid compression caused by too low air-conditioner exhaust temperature, small suction superheat degree of the compressor and too low suction dryness, which affects the reliable operation of the air conditioner. Therefore, the suction temperature Ti and suction pressure pi of the compressor are continuously detected and recorded, the suction superheat degree delta Ti of the compressor is calculated, and the relationship between the suction superheat degree delta Ti and a preset superheat value epsilon is judged, wherein,
if deltaTi is less than or equal to epsilon, namely the air suction dryness of the compressor is less than 1, and the compressor has the liquid impact risk, the opening delta k of the expansion valve is reduced 2 And the throttle is increased to improve the suction superheat degree and ensure the reliability of the compressor. Continuing judgment (Deltak) 1 -Δk 2 ) And a preset opening difference A, if (Deltak 1 -Δk 2 ) Is smaller than or equal to the preset opening difference A, namely the difference of the opening before and after the control of the current expansion valve is not large, the decrease of the inner tube temperature can not be restrained, and the decrease of the air outlet temperature is carried out according to the current air suction pressure pi of the compressor and the inner tube temperature rise rate v T The method comprises the steps of determining and controlling the frequency of a compressor to increase delta f, when the pressure of suction pressure pi of the compressor is larger, the evaporation temperature is higher, and the heat exchange temperature difference outside a heating chamber is smaller, the delta f is larger, so that the heat exchange efficiency and the suction superheat degree can be increased through frequency increase under the condition that the heat exchange is poorer, and the requirements of the reliability and the capacity of the compressor are met; on the contrary, when pi is smaller, Δf is smaller, so that the air conditioner energy efficiency is prevented from being greatly reduced, and the suction superheat degree is continuously improved by reducing the opening of the expansion valve. After controlling the compressor frequency increase Δf, the expansion valve increment Δk is reset 1 ’＝Δk 1 -Δk 2 In Deltak 1 ' is Deltak 1 And (5) the reassigned value is continuously returned to execute the liquid impact judging program of the compressor. If (Deltak) 1 -Δk 2 ) When the difference A is larger than the preset opening, the current air suction dryness can be directly controlled through the expansion valve, the running frequency F of the compressor is not preferentially adjusted, and then the liquid impact judging program of the compressor is continuously executed.
ii if DeltaTi is larger than a preset superheat value epsilon, namely the suction dryness of the compressor is larger than 1, the air conditioner does not have liquid compression. Continuously judging, detecting and recording the current expansion valve opening k, and correcting the retention time t-deltat according to the current compressor frequency F and the expansion valve opening k, wherein deltat=c 9 Δk+c 10 k+c 11 F+c 12 The method comprises the steps of carrying out a first treatment on the surface of the Wherein Δk is the current valve opening k minus the initial valve opening corresponding to the frequency dwell control point. When the delta k is larger, namely the valve opening is larger, the system circulation flow is higher, the return oil and the liquid are better, the delta t is larger, and the residence time is shorter; conversely, when Δk is smaller, the system oil return becomes smaller, Δkthe smaller t, the residence time must not be too short.
The change amplitude deltat of the residence time is also related to the residence frequency F of the compressor, and when the compressor frequency F is higher, the oil discharge rate of the compressor is high, and the compressor needs to be fully returned with longer oil return time, the deltat is smaller. On the contrary, when the frequency F of the compressor is smaller, the oil discharge rate of the compressor is low, the oil shortage risk is reduced, and the Δt is larger, so that the air conditioner can quickly enter the heating stage for heating.
Continuously detecting and recording the accumulated operation time s of the compressor in the operation process,
a. if s is greater than(s) 1 +t), namely the time condition that the compressor reaches the stop control of the exit frequency, entering the frequency raising stage, exiting the reliability control program of the compressor, and turning to normal heating operation;
b. if s is less than or equal to(s) 1 +t), i.e., the compressor is still in the frequency dwell control phase, the above compressor reliability control routine continues to be repeated.
After the air conditioner operation control method is adopted, the air conditioner can keep higher air outlet temperature and larger heat output after exiting cold air prevention control, the heating temperature rise rate is improved, the air conditioner is prevented from heating and blowing cold air, the problems of liquid impact, oil shortage and the like of a compressor are avoided, and the reliable and comfortable operation of the air conditioner is ensured.
The invention also provides a control device of the air conditioner.
Fig. 8 is a block diagram of an embodiment of a control device for an air conditioner according to the present invention. As shown in fig. 8, the control device 100 includes: the first judging unit 110, the second judging unit 120, the control unit 130, and the third judging unit 140.
The first determining unit 110 is configured to determine, after the air conditioner is heated and started and enters the cold air prevention control, whether the air conditioner meets a condition of exiting the cold air prevention control and whether the air conditioner is in a compressor frequency stay control stage.
The compressor frequency stay control means that in the frequency raising process after the compressor is started, the compressor is kept at a set frequency for a set time, and then frequency raising is continued; the set frequency is recorded as the stay point frequency of the compressor frequency stay control, and the set time is recorded as the stay time of the compressor frequency stay control.
In one embodiment, the first judging unit 110 judges whether the air conditioner satisfies a condition of exiting the cold air prevention control, including: judging the tube temperature T of an indoor heat exchanger of the air conditioner s Whether or not it is greater than or equal to a first preset temperature value T 1 If the tube temperature T of the indoor heat exchanger is judged s Greater than or equal to a first preset temperature value T 1 And determining that the air conditioner meets the condition of exiting the cold air prevention control.
Specifically, the tube temperature (simply called as the inner tube temperature) T of the indoor heat exchanger of the air conditioner is detected and recorded in real time s Judging tube temperature T of indoor heat exchanger of air conditioner s And a preset temperature value T 1 The first preset temperature value T1 is the target inner tube temperature of the indoor heat exchanger which exits the cold air prevention control. If T s Less than T 1 The pipe temperature of the indoor heat exchanger of the air conditioner is low, and the air outlet temperature of the air conditioner is low, so that the current internal fan is kept to be closed or the running state of low rotating speed is maintained, and cold air is prevented from being directly blown; if T s Greater than or equal to T 1 The temperature of the heat exchanger tube in the air conditioner indoor is higher, and when the air conditioner indoor heat exchanger tube reaches the exiting cold air prevention control condition, the cold air prevention control is performed, and the inner fan is changed into the set wind gear operation.
In one embodiment, the first determining unit 110 determines whether the air conditioner is in a compressor frequency stay control stage, including: if the accumulated running time s of the compressor of the air conditioner is longer than the preset time s 0 And is less than or equal to the accumulated operating time s of the compressor when entering the compressor frequency stay control 1 And determining that the air conditioner is in the compressor frequency stay control stage if the sum of the stay time t and the compressor frequency stay control is the sum of the stay time t.
The air conditioner is heated and started to run, cold air prevention control is carried out, the inner fan is closed or runs according to a set low rotation speed, and the outdoor environment temperature T is detected and recorded w Indoor environment temperature T n Calculating the temperature difference delta t=t between the indoor environment temperature and the outdoor environment temperature (simply referred to as indoor-outdoor temperature difference) n -T w . According to the outdoor environment temperature T w Indoor ambient temperatureDetermining a dwell point frequency F of compressor frequency dwell control by a temperature difference DeltaT of an outdoor ambient temperature 1 According to the outdoor environment temperature T w Determining the stay time t of the compressor frequency stay control, wherein the stay time is the time for controlling the compressor frequency to be kept at a frequency stay point when the compressor frequency stay control is carried out; dwell point frequency F 1 ＝c 1 T w +c 2 ΔT+c 3 ，c 1 、c 2 、c 3 Is a fitting coefficient, and is obtained by designing an orthogonal verification experiment to obtain data fitting.
Preferably, the control device 100 further includes: a first determining unit (not shown) for determining a dwell time length of the compressor frequency dwell control. The stay time T of the compressor frequency stay control is controlled according to the outdoor environment temperature T w Determining, determining the outdoor environment temperature T w In the temperature interval of more than two preset temperature intervals, wherein each of the more than two preset temperature intervals corresponds to a duration, namely according to the outdoor environment temperature T w And determining the residence time t of the air conditioner for controlling the residence of the compressor frequency at present in the time corresponding to the temperature interval in which the preset more than two temperature intervals are located.
For example, (1) when T w When the value is less than A, the corresponding stay time is t 1 The method comprises the steps of carrying out a first treatment on the surface of the (2) When A is less than or equal to T w When B is less than or equal to B, the corresponding stay time is t 2 The method comprises the steps of carrying out a first treatment on the surface of the (3) When T is w When B is more than zero, the corresponding stay time is t 3 The method comprises the steps of carrying out a first treatment on the surface of the For example, a= -7 ℃, b= 18 ℃, t 1 、t 2 、t 3 120s, 30s, 0s, respectively.
When the outdoor environment temperature T w The lower the indoor and outdoor temperature difference delta T When the system oil return state is poor, the compressor stay point frequency F 1 The lower the residence time t is, the longer the residence time t is, the lower the oil discharge rate of the compressor is, the longer the oil return time is, and the system oil return is improved.
Preferably, the compressor dwell point frequency F is determined 1 Minimum value F of frequency of stop point of compressor min When F is 1 ＜F min F is then 1 Taking F min And the reduction of the reliability of the air conditioner caused by the slow oil return rate of the compressor is avoided. When the outdoor environment temperature T w The higher the indoor and outdoor temperature difference delta T is, the smaller the system oil return state is, the higher the compressor residence point frequency F1 is, the shorter the residence time T is, the more the heating amount is output, and the indoor temperature rise rate is improved. Judging F1 and a preset maximum value F of the frequency of the stop point of the compressor max When F is 1 ＞F max F is then 1 Taking F max The phenomenon that oil shortage or empty oil occurs in a system due to the fact that the oil discharge rate of the compressor is too high is avoided, and the operation reliability of the air conditioner is guaranteed.
Preferably, the control device 100 further includes: a second determining unit (not shown) for determining a cumulative operation duration s of the compressor when entering the compressor frequency stay control based on the initial frequency of the start of the compressor, the duration of the start-up phase of the compressor, and the ascending frequency rate of the compressor 1 。
In one embodiment, the compressor cumulative operating time s at the time of entering the compressor frequency dwell control 1 The calculation formula of (2) is as follows:
s 1 ＝(F 1 -F start )/v+s other
wherein F is 1 Dwell point frequency, F, for compressor frequency dwell control start For starting initial frequency (Hz), s of compressor other The duration of the compressor starting stage may include, for example, a compressor standby duration (i.e., a compressor standby starting duration), a compressor starting protection control duration, a compressor AC current or module current, or an overload protection frequency limit time; v is the rate of rise of the compressor and is a fixed parameter value.
When the air conditioner meets the condition of exiting cold air prevention control, detecting the current accumulated running duration s of the compressor, and judging the accumulated running duration s of the compressor and the preset duration s 0 And the accumulated operation time s for entering the frequency stop point of the compressor 1 Is a relationship of (2);
if the accumulated operation time s of the compressor of the air conditioner is smaller than or equal to the preset time s 0 The current room working condition has high temperature, small load and high temperature rise rate, and is not easy to blow cold air, and the room is maintainedThe front state is normally heating and running; before the compressor is started, the temperature of the indoor heat exchanger tube is equivalent to the indoor temperature, and when the speed of the indoor heat exchanger tube Wen Wensheng is higher than a certain value in the starting stage, the time for reaching the exit condition is smaller than the preset time length s 0 The temperature is high, and cold air is not easy to blow. Preset time length s 0 May be measured experimentally or based on the velocity requirements of the inner tube Wen Wensheng.
If the accumulated running time s of the compressor of the air conditioner is longer than the preset time s 0 And is less than or equal to the accumulated operating time s of the compressor when entering the compressor frequency stay control 1 Sum of dwell time t with compressor frequency dwell control, i.e. s is greater than s 0 And less than or equal to(s) 1 +t), namely, when the air conditioner reaches the target inner pipe temperature condition of exiting cold air prevention control, the air conditioner just enters or is in the stage of compressor frequency stay control, and at the moment, the temperature of the indoor heat exchanger pipe and the air outlet temperature can be quickly reduced due to exiting cold air prevention control, so that the air conditioner enters the compressor reliability control, and the heat output of the air conditioner is improved.
If the accumulated running time s of the compressor of the air conditioner is longer than the accumulated running time s of the compressor when entering the compressor frequency stay control 1 The sum of the dwell time t with the compressor frequency dwell control, i.e. s is greater than (s 1 +t), namely the compressor exits the frequency stop control, the air conditioner is in the frequency raising stage of the compressor, and the heating capacity is continuously increased, so that the normal heating operation in the current state is maintained.
And the second judging unit 120 is configured to judge whether the tube temperature of the indoor heat exchanger of the air conditioner is less than or equal to a second preset temperature value when the first judging unit 110 judges that the air conditioner meets a condition of exiting cold air prevention control and the air conditioner is in a compressor frequency stay control stage.
Specifically, when the air conditioner is judged to meet the condition of exiting cold air prevention control and the air conditioner is in a compressor frequency stay control stage, entering compressor reliability control. After entering the compressor reliability control, detecting the tube temperature T of the indoor heat exchanger of the air conditioner s Judging the tube temperature T of the indoor heat exchanger s And a second preset temperature value T 2 Is a size relationship of (a).If T s Greater than T 2 The inner pipe temperature is slow in descending speed after the normal wind gear is restored, and the air outlet temperature is still higher, so that the current state operation is continuously maintained; if T s Less than or equal to T 2 I.e. the temperature of the inner pipe is rapidly reduced after the normal wind gear is restored, and the hidden danger of blowing cold wind exists.
And a control unit 130, configured to increase the opening of the throttling element of the air conditioner according to the temperature rise rate of the indoor heat exchanger tube temperature if the second judging unit 110 judges that the indoor heat exchanger tube temperature is less than or equal to the second preset temperature value.
The throttling element can be a throttling element between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner. For example, the temperature change value of the tube temperature of the indoor heat exchanger of the air conditioner is obtained every n seconds, and the temperature rise rate of the tube temperature of the indoor heat exchanger can be calculated.
In a specific embodiment, the control unit 130 increases the opening degree of the throttling element of the air conditioner according to the temperature rise rate of the tube temperature of the indoor heat exchanger, including: determining the interval in which the temperature rise rate of the tube temperature of the indoor heat exchanger is in the preset more than two temperature rise rate intervals; determining the opening increment of a throttling element of the air conditioner according to the opening increment corresponding to the interval in which the temperature rise rate of the tube temperature of the indoor heat exchanger is located in the preset more than two temperature rise rate intervals; and increasing the opening of the throttling element of the air conditioner according to the determined opening increment of the throttling element of the air conditioner.
Wherein each of the preset two or more temperature rise rate intervals corresponds to an opening increment; namely, the opening increment corresponding to the interval in which the temperature rise rate of the indoor heat exchanger tube temperature is in the preset more than two temperature rise rate intervals is determined as the opening increment of the throttling element of the air conditioner. The opening degree to which the throttle element increases (i.e., the opening degree increment) is noted as a first opening degree.
For example, the temperature rise rate v of the tube temperature of the indoor heat exchanger T . When v T Less than v 1 When the inner tube temperature drops too fast, the opening delta k of the electronic expansion valve is increased 1 The method comprises the steps of carrying out a first treatment on the surface of the When v 1 ≤v T ≤v 2 When the inner tube temperature is slowly reduced, the opening delta k of the electronic expansion valve is increased 2 ，Δk 1 ＞Δk 2 The method comprises the steps of carrying out a first treatment on the surface of the When v T ＞v 2 When the inner tube temperature is extremely slow to drop or the tube temperature is increased, the opening increment of the electronic expansion valve is 0.
In another specific embodiment, according to the tube temperature v of the indoor heat exchanger T Determining the opening increment delta k of the throttling element of the air conditioner according to a preset opening increment calculation formula 1 The method comprises the steps of carrying out a first treatment on the surface of the According to the determined opening delta k of the throttling element of the air conditioner 1 And increasing the opening degree of a throttling element of the air conditioner. The opening degree to which the throttle element increases (i.e., the opening degree increment) is noted as a first opening degree. The opening increment calculation formula is as follows: Δk 1 ＝c 4 v T +c 5 The method comprises the steps of carrying out a first treatment on the surface of the Wherein c 4 ,c 5 The fitting coefficient can be obtained by designing an orthogonal verification experiment to obtain data fitting.
The control unit 100 is further configured to: when the first judging unit 110 judges that the air conditioner meets the condition of exiting cold air prevention control, but the air conditioner is not in the compressor frequency stay control stage, controlling the air conditioner to maintain the heating operation in the current state; wherein, the condition that the air conditioner is not in the compressor frequency stay control stage includes: the accumulated operation time length of the compressor of the air conditioner is smaller than or equal to the preset time length, and/or the accumulated operation time length of the compressor of the air conditioner is larger than the sum of the accumulated operation time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control.
If the accumulated operation time s of the compressor of the air conditioner is smaller than or equal to the preset time s 0 The method shows that the current room has high working condition temperature, small load and high temperature rise rate, and is not easy to blow cold air, so that the normal heating operation in the current state is maintained; before the compressor is started, the temperature of the indoor heat exchanger tube is equivalent to the indoor temperature, and when the speed of the indoor heat exchanger tube Wen Wensheng is higher than a certain value in the starting stage, the time for reaching the exit condition is smaller than the preset time length s 0 The temperature is high, and cold air is not easy to blow. Preset time length s 0 Can be measured by experiment or according to the temperature of the inner pipeThe rate of rise requirement is obtained.
If the accumulated running time s of the compressor of the air conditioner is longer than the accumulated running time s of the compressor when entering the compressor frequency stay control 1 The sum of the dwell time t with the compressor frequency dwell control, i.e. s is greater than (s 1 +t), namely the compressor exits the frequency stop control, the air conditioner is in the frequency raising stage of the compressor, and the heating capacity is continuously increased, so that the normal heating operation in the current state is maintained.
And a third judging unit 140, configured to judge whether the compressor of the air conditioner performs liquid compression according to the suction superheat degree of the compressor of the air conditioner after the control unit 130 increases the opening degree of the throttling element of the air conditioner.
And detecting the suction temperature Ti and suction pressure Pi of the compressor, inquiring the saturation temperature corresponding to the suction pressure according to the suction pressure Pi, and obtaining the suction superheat degree delta Ti of the compressor according to the difference value of the saturation temperatures corresponding to the suction temperature Ti and the suction pressure, thereby judging whether the liquid compression occurs to the compressor of the air conditioner according to the suction superheat degree delta Ti of the compressor.
In one embodiment, the third judging unit 140 judges whether the liquid compression occurs in the compressor of the air conditioner according to the suction superheat degree of the compressor of the air conditioner, including: judging whether the compressor of the air conditioner is subjected to liquid compression or not according to the relationship between the suction superheat degree delta Ti of the compressor and the preset superheat degree epsilon. If the suction superheat degree is smaller than or equal to the preset superheat value epsilon, judging that liquid compression of the compressor occurs; and if the suction superheat degree is larger than the preset superheat value epsilon, judging that the liquid compression of the compressor does not occur.
The preset superheat value epsilon is a preset suction superheat critical value of liquid compression of the compressor. The range of values of the preset superheat value epsilon can comprise-1 ℃ to 0 ℃ for example.
Specifically, the suction temperature Ti and suction pressure pi of the compressor are detected, and the suction superheat Δti of the compressor is calculated from the suction temperature Ti and suction pressure pi. If the suction superheat degree delta Ti of the compressor is smaller than or equal to a preset superheat value epsilon, namely the suction dryness of the compressor is smaller than 1, the compressor has a liquid impact risk. If Δti is greater than ε, i.e., the compressor suction dryness is greater than 1, the air conditioner does not have liquid compression. The air suction dryness of the compressor is smaller than 1, which means that the refrigerant state of the air suction opening of the compressor is in a gas-liquid two-phase state, and liquid refrigerant is contained and enters the compressor to generate liquid compression. When the suction dryness is greater than 1, the suction port is overheated and does not contain liquid refrigerant, so that there is no possibility of liquid compression.
Given that the refrigerant saturated liquid enthalpy hin, l, saturated gaseous enthalpy hin, v at the air conditioner evaporating pressure (or suction pressure) Pin, and the enthalpy of the compressor suction refrigerant is hin =f (Pin, tin), the suction dryness is x= (hin-hin, l)/(hin, v-hin, l).
The control unit 130 is further configured to: if the third judging unit 140 judges that the liquid compression occurs in the compressor of the air conditioner, the opening degree of the throttling element of the air conditioner is reduced so as to improve the suction superheat degree of the compressor.
If the liquid compression of the compressor is judged, the opening degree of a throttling element of the air conditioner is reduced so as to increase the throttling to improve the suction superheat degree of the compressor, thereby ensuring the reliability of the compressor. The opening degree of the air conditioner with the reduced throttle element is recorded as a second opening degree delta k 2 。
Specifically, after each reduction of the preset opening (for example, each reduction of the throttling element by 2 steps), judging whether the compressor of the air conditioner is subjected to liquid compression according to the magnitude relation between the suction superheat degree Δti of the compressor and the preset superheat value epsilon, if the liquid compression still exists, reducing the preset opening again until the suction superheat degree Δti of the compressor is judged to be greater than the preset superheat value epsilon, that is, if the liquid compression does not exist, recording the accumulated reduced opening as a second opening Δk 2 。
Fig. 9 is a block diagram of another embodiment of a control device of an air conditioner according to the present invention. As shown in fig. 9, the control device 100 further includes a fourth judging unit 160 and an adjusting unit 170.
A fourth judging unit 160, configured to, if the third judging unit 140 judges that the compressor of the air conditioner performs liquid compression, determine a magnitude relation between an opening difference value between the first opening and the second opening and a preset opening difference value after reducing an opening of a throttling element of the air conditioner;
And an adjusting unit 170, configured to adjust the frequency of the compressor according to the current suction pressure of the compressor and the temperature rise rate of the tube temperature of the indoor heat exchanger if the fourth judging unit 160 judges that the opening difference between the first opening and the second opening is less than or equal to the preset opening difference.
Specifically, if the first opening degree Δk 1 And the second opening delta k 2 Opening difference (Δk) 1 -Δk 2 ) Is smaller than or equal to the preset opening difference A, namely the difference of the opening before and after the control of the current throttling element is not large, the decrease of the inner tube temperature can not be restrained, and the decrease of the air outlet temperature is carried out according to the current air suction pressure pi of the compressor and the temperature rise rate v of the tube temperature of the indoor heat exchanger T The compressor frequency is adjusted.
In one embodiment, the compressor frequency is increased by Δf, wherein,
Δf＝c 6 pi+c 7 v T +c 8
wherein pi is the suction pressure of the compressor; v T The temperature rise rate of the tube temperature of the indoor heat exchanger is set; c 6 、c 7 、c 8 The parameters for fitting can be obtained experimentally.
When the pressure of the suction pressure pi of the compressor is higher, the evaporation temperature is higher, and the heat exchange temperature difference at the outer side of the heating chamber is smaller, the delta f is larger, so that the heat exchange efficiency and the suction superheat degree can be improved through frequency raising under the condition of poor heat exchange per se, and the requirements of improving the reliability and the capacity of the compressor are met; on the contrary, when the suction pressure pi of the compressor is smaller, the Δf is smaller, so that the air conditioner energy efficiency is prevented from being greatly reduced, and the suction superheat degree is continuously improved by reducing the opening degree of the expansion valve.
Further, the control device 100 further includes: and a resetting unit (not shown) configured to reset the first opening after the adjusting unit adjusts the frequency of the compressor, so that when the third judging unit judges that the compressor of the air conditioner is in liquid compression, the fourth judging unit judges again that the magnitude relation between the opening difference between the first opening and the second opening and the preset opening difference is the same after the control unit reduces the opening of the throttling element of the air conditioner.
After controlling the compressor frequency to rise by Δf, it is necessary to return to again determine whether the compressor is at risk of a liquid hammer, thus resetting the throttle element opening increment (i.e., the first opening) Δk 1 ’＝Δk 1 -Δk 2 In Deltak 1 ' is Deltak 1 The reassigned value is then returned to the execution of the compressor hydraulic compression determination program again.
If the first opening delta k 1 And the second opening delta k 2 Opening difference (Δk) 1 -Δk 2 ) When the difference A is larger than the preset opening difference A, the air suction dryness can be controlled directly through the throttling device at present, and the judgment of whether the liquid compression occurs to the compressor is continuously executed without adjusting the running frequency F of the compressor.
Fig. 10 is a block diagram of a control device of an air conditioner according to still another embodiment of the present invention. As shown in fig. 10, based on any of the above embodiments, the control device 100 further includes: and a correction unit 180.
And a correction unit 180, configured to correct the stay time of the compressor frequency stay control according to the current opening of the throttling element and the compressor frequency stay point frequency of the air conditioner if the third determination unit 140 determines that the compressor does not perform liquid compression.
In a specific embodiment, a correction duration is determined according to the current opening of a throttling element and the frequency of the compressor of the air conditioner, and the dwell duration of the frequency dwell control of the compressor is corrected according to the determined correction duration; the corrected residence time is equal to the residence time of the current compressor frequency residence control of the air conditioner minus the corrected residence time, and the corrected residence time delta t is determined according to the current opening of the throttling element of the air conditioner and the compressor frequency F;
the correction period Δt=c 9 Δk+c 10 k+c 11 F+c 12 ；
Wherein Δk is equal to the current throttling element opening k minus the dwell of the compressor frequency dwell controlInitial throttle opening k corresponding to point frequency 0 F is the compressor frequency, and when the compressor is in the frequency stay control stage, the compressor frequency is the stay point frequency of the compressor frequency control. c 9 、c 10 、c 11 、c 12 And as the fitting coefficient, the data can be obtained by designing an orthogonal verification test to obtain the final fitting.
When the delta k is larger, namely the opening of the throttling element is larger, the circulation flow of the system is higher, the return oil and the liquid are better, the correction duration delta t is larger, and the stay duration is shorter; conversely, when the smaller the Δk is, the less the system oil return becomes, the smaller the correction duration Δt is, and the stay duration cannot be too short.
The corrected amplitude deltat of the stay time is also related to the compressor frequency F, and when the compressor frequency F is larger, the oil discharge rate of the compressor is high, and the compressor needs to be fully returned with longer oil return time, the deltat is smaller. On the contrary, when the frequency F of the compressor is smaller, the oil discharge rate of the compressor is low, the oil shortage risk is reduced, and the Δt is larger, so that the air conditioner can quickly enter the heating stage for heating.
According to a further embodiment of the present invention, based on the above embodiment, the control unit 130 is further configured to: and when the air conditioner meets the condition of exiting the compressor frequency residence control, controlling the air conditioner to resume normal heating operation.
The conditions for exiting compressor frequency dwell control include: the accumulated operation time s of the compressor is longer than the accumulated operation time s of the compressor when the compressor frequency stay control is entered 1 And the sum of dwell time of the compressor frequency dwell control.
Specifically, if the compressor cumulative operating time s is greater than the compressor cumulative operating time s when entering the compressor frequency stay control 1 The sum of the dwell time t with the compressor frequency dwell control, i.e. s is greater than (s 1 +t), namely the time condition that the compressor reaches the stop control of the exit frequency, enters the frequency raising stage, exits the compressor reliability control program and changes to normal heating operation. If the accumulated operation time s of the compressor is smaller than or equal to the accumulated operation time s of the compressor when entering the compressor frequency stay control 1 Dwell with compressor frequency dwell controlThe sum of the time periods t, i.e. s is less than or equal to (s 1 +t), i.e., the compressor is still in the frequency dwell control phase, the above compressor reliability control routine continues to be repeated.
The present invention also provides a storage medium corresponding to the control method of an air conditioner, on which a computer program is stored, which program, when being executed by a processor, implements the steps of any of the methods described above.
The invention also provides an air conditioner corresponding to the control method of the air conditioner, which comprises a processor, a memory and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of any one of the methods when executing the program.
The invention also provides an air conditioner corresponding to the control device of the air conditioner, which comprises the control device of any one of the air conditioners.
According to the scheme provided by the invention, when the heating operation exits cold air prevention and is in the frequency residence control stage, the opening degree of the throttling element is regulated and controlled according to the temperature change of the inner pipe and the temperature change rate of the inner pipe so as to increase the air conditioning capacity output, improve the system oil return, improve the air outlet temperature of the air conditioner, shorten the residence time of constant frequency operation, simultaneously perform hydraulic compression identification and control through the air suction dryness of the compressor, and control the frequency in parallel and the opening degree of the throttling element so as to increase the heat output of the air conditioner, avoid the liquid compression of the compressor, and improve the heating comfort of a user and the operation reliability of the compressor. On the premise of meeting the requirement of rapid hot air blowing of air conditioning heat, the problem that the reliability of an air conditioning system is reduced under the condition of large heat output of the existing air conditioner is solved, comfortable and reliable operation of the air conditioner is realized, and user experience is improved.
According to the technical scheme, the system reliability is comprehensively controlled by utilizing a plurality of parameters, the problem that the heating comfort is poor due to single reliability control means of the existing compressor can be solved, the reliability problems of oil shortage or oil empty, hydraulic compression and the like of the compressor are avoided while the large capacity output of the air conditioner and the rapid heating operation are ensured, the heating comfort of a user is improved to the maximum extent, and the service life of the compressor is prolonged.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit.
In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate components may or may not be physically separate, and components as control devices may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the related art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A control method of an air conditioner, comprising:
after the air conditioner is heated and started and enters cold air prevention control, judging whether the air conditioner meets the condition of exiting the cold air prevention control and whether the air conditioner is in a compressor frequency stay control stage;
when judging that the air conditioner meets the condition of exiting cold air prevention control and the air conditioner is in a compressor frequency stay control stage, judging whether the tube temperature of an indoor heat exchanger of the air conditioner is smaller than or equal to a second preset temperature value;
if the pipe temperature of the indoor heat exchanger is judged to be smaller than or equal to a second preset temperature value, increasing the opening of a throttling element of the air conditioner according to the temperature rise rate of the pipe temperature of the indoor heat exchanger, wherein the increased opening of the throttling element is recorded as a first opening, and the increased opening is equal to the opening after the increase minus the opening before the increase;
After the opening degree of a throttling element of the air conditioner is increased, judging whether liquid compression occurs to the compressor of the air conditioner according to the suction superheat degree of the compressor of the air conditioner;
and if the compressor of the air conditioner is judged to generate liquid compression, reducing the opening of a throttling element of the air conditioner to improve the suction superheat degree of the compressor, wherein the reduced opening of the throttling element is recorded as a second opening, and the reduced opening is equal to the opening before reduction minus the opening after reduction.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
judging whether the air conditioner meets the condition of exiting cold air prevention control or not, comprising:
judging whether the tube temperature of the indoor heat exchanger of the air conditioner is greater than or equal to a first preset temperature value, and if so, determining that the air conditioner meets the condition of exiting cold air prevention control;
and/or the number of the groups of groups,
judging whether the air conditioner is in a compressor frequency stay control stage or not, comprising:
if the accumulated running time length of the compressor of the air conditioner is longer than the preset time length and is smaller than or equal to the sum of the accumulated running time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control, determining that the air conditioner is in a compressor frequency residence control stage;
And/or the number of the groups of groups,
increasing the opening of a throttling element of the air conditioner according to the temperature rise rate of the tube temperature of the indoor heat exchanger, comprising:
determining a section in which the temperature rise rate of the tube temperature of the indoor heat exchanger is located in more than two preset temperature rise rate sections, wherein each section in the more than two preset temperature rise rate sections corresponds to an opening increment;
determining the opening increment of a throttling element of the air conditioner according to the opening increment corresponding to the interval in which the temperature rise rate of the tube temperature of the indoor heat exchanger is located in the preset more than two temperature rise rate intervals;
increasing the opening of the throttling element of the air conditioner according to the determined opening increment of the throttling element of the air conditioner;
and/or the number of the groups of groups,
judging whether liquid compression occurs to the compressor of the air conditioner according to the suction superheat degree of the compressor of the air conditioner, comprising:
judging whether the compressor of the air conditioner is subjected to liquid compression or not according to the relationship between the suction superheat degree of the compressor and a preset superheat degree value;
and if the suction superheat degree is larger than the preset superheat value, judging that the compressor does not generate liquid compression.
3. The method according to claim 1 or 2, further comprising:
when judging that the air conditioner meets the condition of exiting cold air prevention control, but the air conditioner is not in a compressor frequency stay control stage, controlling the air conditioner to maintain the heating operation in the current state;
wherein, the condition that the air conditioner is not in the compressor frequency stay control stage includes:
the accumulated running time length of the compressor of the air conditioner is smaller than or equal to a preset time length, and/or the accumulated running time length of the compressor of the air conditioner is larger than the sum of the accumulated running time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control;
and/or the number of the groups of groups,
when the air conditioner meets the condition of exiting the compressor frequency residence control, controlling the air conditioner to resume normal heating operation;
the conditions for exiting compressor frequency dwell control include: the accumulated running time length of the compressor is longer than the sum of the accumulated running time length of the compressor and the stay time length of the compressor frequency stay control when entering the compressor frequency stay control;
and/or the number of the groups of groups,
if the compressor of the air conditioner is judged to generate liquid compression, after the opening of a throttling element of the air conditioner is reduced, judging the magnitude relation between the opening difference value of the first opening and the second opening and the preset opening difference value;
If the opening difference value of the first opening and the second opening is smaller than or equal to a preset opening difference value, the frequency of the compressor is adjusted according to the current suction pressure of the compressor and the temperature rise rate of the tube temperature of the indoor heat exchanger;
and/or the number of the groups of groups,
and if the compressor of the air conditioner is judged not to have liquid compression, correcting the stay time of the stay control of the compressor frequency according to the current opening of the throttling element and the compressor frequency of the air conditioner.
4. The method of claim 3, wherein the step of,
the residence time of the compressor frequency residence control is determined according to the outdoor environment temperature, and the method comprises the following steps:
determining a temperature interval in which the outdoor environment temperature is located in more than two preset temperature intervals; wherein each of the preset two or more temperature intervals corresponds to a duration;
determining the residence time of the air conditioner for controlling the compressor frequency residence at present according to the time corresponding to the outdoor environment temperature in the temperature intervals of more than two preset temperature intervals;
and/or the number of the groups of groups,
the accumulated operation time of the compressor when the compressor frequency retention control is entered is determined according to the initial starting frequency of the compressor, the time of the starting stage of the compressor and the frequency raising rate of the compressor;
The calculation formula of the accumulated operation time s1 of the compressor when entering the compressor frequency stay control is as follows:
s 1 ＝(F 1 -F start )/v+s other
wherein F is 1 Dwell point frequency, F, for compressor frequency dwell control start For starting initial frequency of compressor s other V is the frequency raising rate of the compressor;
and/or, further comprising:
resetting the first opening after adjusting the frequency of the compressor, so as to judge the magnitude relation between the opening difference value of the first opening and the second opening and the preset opening difference value again after reducing the opening of a throttling element of the air conditioner under the condition that the compressor of the air conditioner is judged to generate liquid compression;
and/or the number of the groups of groups,
correcting the stay time of the stay control of the compressor frequency according to the current opening of the throttling element and the compressor frequency of the air conditioner, wherein the method comprises the following steps:
determining a correction duration according to the current opening of a throttling element of the air conditioner and the frequency of the compressor, and correcting the stay duration of the frequency stay control of the compressor according to the determined correction duration;
and the corrected residence time is equal to the residence time of the current compressor frequency residence control of the air conditioner minus the corrected residence time.
5. A control device of an air conditioner, comprising:
The first judging unit is used for judging whether the air conditioner meets the condition of exiting cold air prevention control or not and whether the air conditioner is in a compressor frequency stay control stage or not after the air conditioner is heated and started and enters cold air prevention control;
the second judging unit is used for judging whether the tube temperature of the indoor heat exchanger of the air conditioner is smaller than or equal to a second preset temperature value when the first judging unit judges that the air conditioner meets the condition of exiting cold air prevention control and the air conditioner is in a compressor frequency stay control stage;
a control unit, configured to increase the opening of a throttling element of the air conditioner according to the rate of temperature rise of the indoor heat exchanger tube temperature if the second judging unit judges that the indoor heat exchanger tube temperature is less than or equal to a second preset temperature value, where the increased opening of the throttling element is recorded as a first opening, and the increased opening is equal to the increased opening minus the opening before the increase;
a third judging unit, configured to judge whether liquid compression occurs in the compressor of the air conditioner according to the suction superheat degree of the compressor of the air conditioner after the control unit increases the opening degree of the throttling element of the air conditioner;
The control unit is further configured to: and if the third judging unit judges that the liquid compression occurs in the compressor of the air conditioner, reducing the opening of a throttling element of the air conditioner to improve the suction superheat degree of the compressor, wherein the reduced opening of the throttling element is recorded as a second opening, and the reduced opening is equal to the opening before reduction minus the opening after reduction.
6. The control device according to claim 5, wherein,
the first judging unit judges whether the air conditioner meets the condition of exiting cold air prevention control, and comprises the following steps:
judging whether the tube temperature of the indoor heat exchanger of the air conditioner is greater than or equal to a first preset temperature value, and if so, determining that the air conditioner meets the condition of exiting cold air prevention control;
and/or the number of the groups of groups,
the first judging unit judges whether the air conditioner is in a compressor frequency stay control stage, and comprises:
if the accumulated running time length of the compressor of the air conditioner is longer than the preset time length and is smaller than or equal to the sum of the accumulated running time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control, determining that the air conditioner is in a compressor frequency residence control stage;
And/or the number of the groups of groups,
the control unit increases the opening of the throttling element of the air conditioner according to the temperature rise rate of the tube temperature of the indoor heat exchanger, and comprises the following steps:
determining a section in which the temperature rise rate of the tube temperature of the indoor heat exchanger is located in more than two preset temperature rise rate sections, wherein each section in the more than two preset temperature rise rate sections corresponds to an opening increment;
determining the opening increment of a throttling element of the air conditioner according to the opening increment corresponding to the interval in which the temperature rise rate of the tube temperature of the indoor heat exchanger is located in the preset more than two temperature rise rate intervals;
increasing the opening of the throttling element of the air conditioner according to the determined opening increment of the throttling element of the air conditioner;
and/or the number of the groups of groups,
the third judging unit judges whether liquid compression occurs to the compressor of the air conditioner according to the suction superheat degree of the compressor of the air conditioner, and comprises:
judging whether the compressor of the air conditioner is subjected to liquid compression or not according to the relationship between the suction superheat degree of the compressor and a preset superheat degree value;
and if the suction superheat degree is larger than the preset superheat value, judging that the compressor does not generate liquid compression.
7. The control device according to claim 5 or 6, wherein,
the control unit is further configured to: when judging that the air conditioner meets the condition of exiting cold air prevention control, but the air conditioner is not in a compressor frequency stay control stage, controlling the air conditioner to maintain the heating operation in the current state;
wherein, the condition that the air conditioner is not in the compressor frequency stay control stage includes:
the accumulated running time length of the compressor of the air conditioner is smaller than or equal to a preset time length, and/or the accumulated running time length of the compressor of the air conditioner is larger than the sum of the accumulated running time length of the compressor when entering the compressor frequency residence control and the residence time length of the compressor frequency residence control;
and/or the number of the groups of groups,
the control unit is further configured to: when the air conditioner meets the condition of exiting the compressor frequency residence control, controlling the air conditioner to resume normal heating operation;
the conditions for exiting compressor frequency dwell control include: the accumulated running time length of the compressor is longer than the sum of the accumulated running time length of the compressor and the stay time length of the compressor frequency stay control when entering the compressor frequency stay control;
and/or the number of the groups of groups,
the control device further includes:
A fourth judging unit, configured to judge, if the third judging unit judges that liquid compression occurs in the compressor of the air conditioner, a magnitude relationship between an opening difference value between the first opening and the second opening and a preset opening difference value after reducing an opening of a throttling element of the air conditioner;
the adjusting unit is used for adjusting the frequency of the compressor according to the current suction pressure of the compressor and the temperature rise rate of the tube temperature of the indoor heat exchanger if the fourth judging unit judges that the opening difference value of the first opening and the second opening is smaller than or equal to the preset opening difference value;
and/or the number of the groups of groups,
further comprises:
and the correction unit is used for correcting the stay time of the compressor frequency stay control according to the current opening degree of the throttling element and the compressor frequency of the air conditioner if the third judgment unit judges that the compressor of the air conditioner does not generate liquid compression.
8. The control device according to claim 7, wherein,
the control device further includes: the first determining unit is configured to determine a residence time of the compressor frequency residence control, where the residence time of the compressor frequency residence control is determined according to an outdoor environment temperature, and includes:
Determining a temperature interval in which the outdoor environment temperature is located in more than two preset temperature intervals; wherein each of the preset two or more temperature intervals corresponds to a duration;
determining the residence time of the air conditioner for controlling the compressor frequency residence at present according to the time corresponding to the outdoor environment temperature in the temperature intervals of more than two preset temperature intervals;
and/or the number of the groups of groups,
the control device further includes: the second determining unit is used for determining the accumulated operation duration of the compressor when the compressor frequency stay control is entered according to the initial starting frequency of the compressor, the duration of the starting stage of the compressor and the ascending frequency rate of the compressor;
wherein, the accumulated operation time s of the compressor when entering the compressor frequency stay control 1 The calculation formula of (2) is as follows:
s 1 ＝(F 1 -F start )/v+s other
wherein F is 1 Dwell point frequency, F, for compressor frequency dwell control star t is the initial frequency of starting the compressor, s other V is the frequency raising rate of the compressor;
and/or the number of the groups of groups,
the control device further includes: the resetting unit is used for resetting the first opening after the adjusting unit adjusts the frequency of the compressor, so that the fourth judging unit judges the magnitude relation between the opening difference value of the first opening and the second opening and the preset opening difference value again after the control unit reduces the opening of the throttling element of the air conditioner under the condition that the third judging unit judges that the compressor of the air conditioner is in liquid compression;
And/or the number of the groups of groups,
the correction unit corrects the residence time of the residence control of the compressor frequency according to the current opening of the throttling element and the compressor frequency of the air conditioner, and the correction unit comprises:
determining a correction duration according to the current opening of a throttling element of the air conditioner and the frequency of the compressor, and correcting the stay duration of the frequency stay control of the compressor according to the determined correction duration;
and the corrected residence time is equal to the residence time of the current compressor frequency residence control of the air conditioner minus the corrected residence time.
9. A storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of any of claims 1-4.
10. An air conditioner comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of any one of claims 1 to 4 when the program is executed, or comprising the control device of the air conditioner of any one of claims 5 to 8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117255544A (en) * | 2023-11-20 | 2023-12-19 | 珠海格力电器股份有限公司 | Control method and device of base station air conditioner, base station air conditioner and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117255544A (en) * | 2023-11-20 | 2023-12-19 | 珠海格力电器股份有限公司 | Control method and device of base station air conditioner, base station air conditioner and storage medium |
| CN117255544B (en) * | 2023-11-20 | 2024-02-09 | 珠海格力电器股份有限公司 | Control method and device of base station air conditioner, base station air conditioner and storage medium |
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