CN110645682A - Control method and device of air conditioner and air conditioner - Google Patents

Control method and device of air conditioner and air conditioner Download PDF

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Publication number
CN110645682A
CN110645682A CN201911000158.8A CN201911000158A CN110645682A CN 110645682 A CN110645682 A CN 110645682A CN 201911000158 A CN201911000158 A CN 201911000158A CN 110645682 A CN110645682 A CN 110645682A
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value
temperature
inner disc
air conditioner
target
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CN110645682B (en
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侯丽峰
秦宪
赵攀
贾宝莹
汪云强
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The embodiment of the invention provides a control method and device of an air conditioner and the air conditioner, and relates to the technical field of air conditioners. The control method of the air conditioner comprises the following steps: and controlling the actual inner disc temperature of the air conditioner to be maintained at a target inner disc temperature when the air conditioner is in a heating mode, wherein the target inner disc temperature is determined by a target heating capacity value of the air conditioner in the heating mode. And if the actual inner disc temperature is lower than the critical inner disc temperature and the duration time is longer than the preset time, controlling the air conditioner to enter a defrosting mode from a heating mode, wherein the critical inner disc temperature is lower than the target inner disc temperature. According to the control method and device for the air conditioner and the air conditioner, the air conditioner can determine the target inner disc temperature according to the required target heating capacity value, and the actual inner disc temperature of the air conditioner is maintained at the target inner disc temperature, so that the heating capacity of the air conditioner can meet the requirement, the problem of high attenuation rate of heating operation of the air conditioner can be solved without adding any device structure, and the heating energy efficiency of the air conditioner is improved.

Description

Control method and device of air conditioner and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of an air conditioner and the air conditioner.
Background
The problems of the heating operation in the air conditioning industry at present are as follows: in the initial stage of heating operation of the air conditioner, the frequency of a compressor is rapidly increased, the high-frequency operation is kept, the temperature of an inner disc of the air conditioner is rapidly increased to about 48 ℃, an outdoor evaporator begins to frost, the heating capacity is gradually reduced, and the air conditioner is switched from a heating mode to a defrosting mode after the air conditioner reaches a defrosting mode entering condition. However, the air conditioner has a poor heating effect because the heating capacity of the air conditioner is seriously reduced (even reduced by 50%) in the heating process.
Disclosure of Invention
The invention solves the problems that: the air conditioner has the problems of serious attenuation of heating capacity and poor heating efficiency in the heating process.
In order to solve the above problems, embodiments of the present invention provide a method and an apparatus for controlling an air conditioner, and an air conditioner.
In a first aspect, an embodiment of the present invention provides a method for controlling an air conditioner, including:
controlling an actual inner disc temperature of an air conditioner to be maintained at a target inner disc temperature when the air conditioner is in a heating mode, wherein the target inner disc temperature is determined by a target heating capacity value of the air conditioner in the heating mode;
and if the actual inner disc temperature is lower than the critical inner disc temperature and the duration time is longer than the preset time, controlling the air conditioner to enter a defrosting mode from the heating mode, wherein the critical inner disc temperature is lower than the target inner disc temperature.
The embodiment of the invention provides a control method of an air conditioner, because the air conditioner can determine the target inner disc temperature according to the required target heating capacity value and maintain the actual inner disc temperature of the air conditioner at the target inner disc temperature, the heating capacity of the air conditioner can meet the requirement, the problem of large attenuation rate of heating operation of the air conditioner can be solved without adding any device structure, and the heating energy efficiency of the air conditioner is improved.
Further, when the heating capacity value of the air conditioner reaches the target heating capacity value and the slope of the curve which decreases with the heating operation time is higher than a preset value, the actual inner disc temperature corresponding to the heating capacity value is the target inner disc temperature.
Further, the target inner disc temperature represents that the heating capacity value of the air conditioner is in a preset target heating capacity interval corresponding to the target heating capacity value along with the rise of the heating operation time of the air conditioner under the target inner disc temperature.
Further, the critical inner disc temperature is 1-5 ℃ lower than the target inner disc temperature.
Further, the step of controlling the actual inner panel temperature of the air conditioner to be maintained at the target inner panel temperature while the air conditioner is in the heating mode includes:
determining an operation frequency change value of a compressor of the air conditioner according to the actual inner disc temperature and the target inner disc temperature when the air conditioner is in the heating mode;
calculating a target operating frequency of the compressor according to the current operating frequency of the compressor and the operating frequency variation value;
controlling the compressor to actually operate at the target operation frequency so that the actual inner disc temperature is maintained at the target inner disc temperature.
Further, the step of calculating the target operating frequency of the compressor according to the current operating frequency of the compressor and the operating frequency variation value includes:
calculating the target operating frequency of the compressor according to the following formula:
F＝F0+△F；
wherein F represents the target operating frequency, F0And represents the current operating frequency, and deltaF represents the operating frequency change value.
Further, the step of determining an operation frequency variation value of a compressor of the air conditioner according to the actual inner panel temperature and the target inner panel temperature when the air conditioner is in the heating mode includes:
judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a first preset value and less than or equal to a second preset value or not;
if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a first preset value and less than or equal to a second preset value, setting the operating frequency variation value to be 0;
if the difference value between the actual inner disc temperature and the target inner disc temperature is not greater than or equal to a first preset value and is less than or equal to a second preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is larger than the second preset value, setting the operation frequency variation value as a frequency value smaller than 0;
and if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than the first preset value, setting the operation frequency variation value as a frequency value larger than 0.
Further, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value, the step of setting the operating frequency variation value to a frequency value smaller than 0 includes:
if the difference value between the actual inner disc temperature and the target inner disc temperature is larger than the second preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than a third preset value, wherein the third preset value is larger than the second preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value and smaller than the third preset value, setting the operation frequency variation value to be a first frequency variation value smaller than 0;
and if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a third preset value, setting the operation frequency variation value as a frequency value smaller than the first frequency variation value.
Further, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a third preset value, the step of setting the operating frequency variation value to a frequency value smaller than the first frequency variation value includes:
if the difference value between the actual inner disc temperature and the target inner disc temperature is larger than or equal to a third preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than a fourth preset value, wherein the fourth preset value is larger than the third preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a third preset value and smaller than a fourth preset value, setting the operation frequency change value as a second frequency change value, wherein the second frequency change value is smaller than the first frequency change value;
and if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a fourth preset value, setting the operation frequency variation value as a third frequency variation value, wherein the third frequency variation value is smaller than the second frequency variation value.
Further, if the difference between the actual inner disc temperature and the target inner disc temperature is smaller than the first preset value, the step of setting the operating frequency variation value to a frequency value larger than 0 includes:
if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than the first preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is larger than a fifth preset value, wherein the fifth preset value is smaller than the first preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is larger than the fifth preset value and smaller than the first preset value, setting the operation frequency variation value to be a fourth frequency variation value larger than 0;
and if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than or equal to the fifth preset value, setting the operation frequency variation value as a frequency value larger than the fourth frequency variation value.
Further, if the difference between the actual inner disc temperature and the target inner disc temperature is less than or equal to the fifth preset value, the step of setting the operating frequency variation value to a frequency value greater than the fourth frequency variation value includes:
if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than or equal to the fifth preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is larger than a sixth preset value, wherein the sixth preset value is smaller than the fifth preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than the sixth preset value and less than or equal to the fifth preset value, setting the operation frequency variation value as a fifth frequency variation value, wherein the fifth frequency variation value is greater than the fourth frequency variation value;
and if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than or equal to the sixth preset value, setting the operation frequency change value as a sixth frequency change value, wherein the sixth frequency change value is larger than the fifth frequency change value.
Further, before the step of controlling the actual inner panel temperature of the air conditioner to be maintained at the target inner panel temperature when the air conditioner is in the heating mode, the method further includes:
judging whether the exhaust temperature of a compressor of the air conditioner is greater than or equal to a first exhaust temperature;
if the exhaust temperature is greater than or equal to a first exhaust temperature, controlling the compressor to stop;
if the exhaust temperature is lower than the first exhaust temperature, judging whether the exhaust temperature is higher than or equal to a second exhaust temperature and lower than the first exhaust temperature;
if the exhaust temperature is greater than or equal to a second exhaust temperature and less than the first exhaust temperature, controlling the current operation frequency of the compressor to be reduced;
if the exhaust temperature is lower than the second exhaust temperature, judging whether the exhaust temperature is higher than or equal to a third exhaust temperature and lower than the second exhaust temperature;
if the exhaust temperature is greater than or equal to a third exhaust temperature and less than the second exhaust temperature, controlling the compressor to prohibit frequency increase;
and if the exhaust temperature is lower than the third exhaust temperature, controlling the actual inner disc temperature of the air conditioner to be maintained at the target inner disc temperature when the air conditioner is in the heating mode.
In a second aspect, an embodiment of the present invention provides a control device for an air conditioner, including:
the control module is used for controlling the actual inner disc temperature of the air conditioner to be maintained at a target inner disc temperature when the air conditioner is in a heating mode, wherein the target inner disc temperature is determined by a target heating capacity value of the air conditioner in the heating mode;
the control module is further used for controlling the air conditioner to enter a defrosting mode from the heating mode if the actual inner disc temperature is lower than the critical inner disc temperature and the duration is longer than the preset time, wherein the critical inner disc temperature is lower than the target inner disc temperature.
The control device of the air conditioner provided by the embodiment of the invention has the advantages similar to the advantages of the control method of the air conditioner provided by the embodiment of the invention, and can also solve the problem of large attenuation rate of heating operation of the air conditioner and improve the heating energy efficiency of the air conditioner.
In a third aspect, an embodiment of the present invention provides an air conditioner, including a controller, where the controller is configured to execute a computer instruction to implement the control method of the air conditioner according to any one of the foregoing embodiments.
The air conditioner provided by the embodiment of the invention has the advantages similar to the control method of the air conditioner provided by the embodiment of the invention, and can also solve the problem of large attenuation rate of heating operation of the air conditioner and improve the heating energy efficiency of the air conditioner.
Drawings
Fig. 1 is a schematic flow chart illustrating a control method of an air conditioner according to an embodiment of the present invention;
fig. 2 is a heating capacity graph of the air conditioner according to the embodiment of the present invention, wherein the air conditioner is operated in a heating mode at an ambient temperature of 2 ℃, and the heating capacity value of the air conditioner is plotted with the heating operation time;
fig. 3 is a heating capacity graph of the air conditioner according to the heating operation time when the air conditioner is operated to heat at an ambient temperature of 2 ℃ and the actual inner panel temperature is maintained at the target inner panel temperature;
FIG. 4 is a flowchart illustrating sub-steps of step S200 in FIG. 1;
FIG. 5 is a flow diagram illustrating sub-steps of substep 210 of FIG. 2;
FIG. 6 is a flow diagram illustrating sub-steps of substep 340 of FIG. 3;
fig. 7 is a flow diagram illustrating sub-steps of sub-step 350 in fig. 3.
Detailed Description
At present, the air conditioner has the problems of serious attenuation of heating capacity and poor heating efficiency in the heating process. In the research of the air conditioner, the designer of the invention finds that the frequency of the compressor is rapidly increased at the initial stage of heating operation of the air conditioner, the air conditioner keeps operating at high frequency, the temperature of an inner disc of the air conditioner is rapidly increased to about 48 ℃, an outdoor evaporator starts frosting, the heating capacity is gradually reduced, the temperature of the inner disc is reduced, in order to ensure the heating duration, the temperature of the inner disc is low when the air conditioner enters a defrosting mode, the air outlet temperature of the air conditioner in a heating period is greatly changed, the comfort is influenced, the capacity attenuation is serious in the heating process, and the heating efficiency is poor. In order to improve the technical effects, the designer of the invention designs a control method and a control device of an air conditioner and the air conditioner, so as to solve the problem of large attenuation rate of heating operation of the air conditioner, improve the heating energy efficiency of the air conditioner, further solve the problem of large change of outlet air temperature of the air conditioner and ensure the indoor comfort of the heating operation.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, a control method of an air conditioner according to an embodiment of the present invention includes the following steps:
step S110, determining whether the discharge temperature of the compressor of the air conditioner is greater than or equal to a first discharge temperature.
After the air conditioner is started to heat, the air conditioner is in a heating mode, and the working state of the compressor can be judged according to the exhaust temperature of the compressor. The first exhaust temperature is set according to actual needs, and in this embodiment, the first exhaust temperature is 110 ℃. For convenience of explanation, the discharge temperature of the compressor is denoted by Td. In step S110, it is determined whether the exhaust temperature satisfies Td ≧ 110 ℃.
And step S120, if the exhaust temperature is greater than or equal to the first exhaust temperature, controlling the compressor to stop.
It should be understood that in the present embodiment, if the discharge temperature of the compressor is greater than or equal to the first discharge temperature, i.e. Td ≧ 110 ℃, the discharge temperature of the compressor is considered to be too high, and the compressor is controlled to be directly stopped.
In step S130, if the exhaust temperature is lower than the first exhaust temperature, it is determined whether the exhaust temperature is higher than or equal to the second exhaust temperature and lower than the first exhaust temperature.
Note that the second exhaust temperature is lower than the first exhaust temperature. The second exhaust temperature is set according to actual needs, and in this embodiment, the second exhaust temperature is 100 ℃. That is, in step S130 of the present embodiment, it is determined whether the exhaust temperature satisfies 100 ℃ ≦ Td < 110 ℃.
And step S140, if the exhaust temperature is greater than or equal to the second exhaust temperature and less than the first exhaust temperature, controlling the current operation frequency of the compressor to be reduced.
It should be understood that in the present embodiment, if the discharge air temperature is greater than or equal to the second discharge air temperature and less than the first discharge air temperature, i.e., 100 ℃. ltoreq. Td < 110 ℃, then the discharge air temperature of the compressor is considered to be higher, and the current operating frequency of the compressor is controlled to be lowered to lower the discharge air temperature of the compressor. Optionally, the current operating frequency of the compressor is controlled to decrease at a rate of decrease of 5 s/Hz. Of course, the rate of decrease of the compressor frequency can be set accordingly according to actual needs.
Step S150, if the exhaust temperature is lower than the second exhaust temperature, determine whether the exhaust temperature is greater than or equal to the third exhaust temperature and lower than the second exhaust temperature.
Note that the third exhaust gas temperature is lower than the second exhaust gas temperature. The third exhaust temperature is set according to actual needs, and in this embodiment, the third exhaust temperature is 95 ℃. That is, in step S150 of the present embodiment, it is determined whether the exhaust temperature satisfies 95 ℃. ltoreq. Td < 100 ℃.
In step S160, if the discharge temperature is greater than or equal to the third discharge temperature and less than the second discharge temperature, the compressor is controlled to prohibit the frequency increase.
It should be understood that in the present embodiment, the compressor is controlled to prohibit the frequency up-conversion if the discharge temperature is greater than or equal to the third discharge temperature and less than the second discharge temperature, i.e., 95 ℃ ≦ Td < 100 ℃.
It should be noted that, in steps 110 to 160, the operating condition of the compressor is determined according to the discharge temperature of the compressor, so as to determine whether the compressor can be frequency-increased, and the following steps are performed to control the current operating frequency of the compressor as required.
In addition, in this embodiment, if the exhaust temperature is lower than the third exhaust temperature, that is, Td < 95 ℃, the following step S200 is executed.
And S200, controlling the actual inner disc temperature of the air conditioner to be maintained at the target inner disc temperature when the air conditioner is in the heating mode, wherein the target inner disc temperature is determined by the target heating capacity value of the air conditioner in the heating mode.
It should be noted that, after the air conditioner is started to heat, the compressor is normally started to operate, and after the compressor is operated for a period of time, for example, 10min, the actual inner disc temperature starts to be detected, where the actual inner disc temperature represents the real-time coil temperature of the indoor unit. During detection, the detection is performed once every a period of time, and the time interval is set accordingly as required, and may be 30s, for example.
Referring to fig. 2, fig. 2 is a heating capacity graph of an air conditioner according to an embodiment of the present invention, wherein the air conditioner is operated in a heating mode at an ambient temperature of 2 ℃, and a heating capacity value of the air conditioner is plotted with the heating operation time; wherein, the ordinate is the heating capacity value with the unit of W, and the abscissa is the heating operation time with the unit of min. And when the heating capacity value of the air conditioner reaches the target heating capacity value and the slope of the curve which decreases along with the heating operation time is higher than the preset value, the actual inner disc temperature corresponding to the heating capacity value is the target inner disc temperature.
It should be noted that, experimental data show that, under the experimental working condition, the target inner disc temperature and the heating capacity of the same model are in a linear relationship, that is, the higher the target inner disc temperature is, the higher the heating capacity is, the corresponding heating time is reduced, and the attenuation is increased. The air conditioner can select a proper target inner plate temperature according to the required heating capacity so as to prolong the heating time and reduce the attenuation. That is, the target inner disc temperature is determined according to the target heating capacity value. Wherein, the target heating capacity value is set correspondingly according to actual needs. In this embodiment, in a heating capacity curve in which a heating capacity value of the air conditioner changes with a heating operation time when an ambient temperature is 2 ℃, a target preset inner panel temperature (at which time an actual inner panel temperature of the air conditioner is not controlled to be maintained at the target preset inner panel temperature) is set to 48 ℃, and as the heating operation time changes, the heating capacity value first rises and then falls, and due to changes in the heating capacity value and frosting of an indoor unit coil, the actual inner panel temperature does not reach the target preset inner panel temperature. When the heating capacity value reaches the target heating capacity value, for example, the target heating capacity value is set to 8000W as required, that is, the heating capacity value reaches 8000W, and the slope of the curve of the heating capacity value decreasing with the heating operation time is higher than a preset value (indicating that the attenuation of the heating capacity value is greater than the preset attenuation change rate), in order to reduce the attenuation, the actual inner panel temperature corresponding to the heating capacity value with the slope of the curve higher than the preset value is taken as the target inner panel temperature. In this embodiment, the actual inner panel temperature corresponding to the heating capacity value with the slope of the curve higher than the preset value is 43 ℃, so that the target inner panel temperature can be set according to the heating capacity curve and the target heating capacity value, that is, the target inner panel temperature is set to be 43 ℃, and the actual inner panel temperature of the air conditioner is controlled to be maintained at the target inner panel temperature.
Referring to fig. 3, fig. 3 is a heating capacity graph of the air conditioner according to the heating operation time when the air conditioner provided by the embodiment of the present invention is operated to heat at an ambient temperature of 2 ℃, and when the actual inner panel temperature is maintained at the target inner panel temperature, the heating capacity value of the air conditioner is plotted; wherein, the ordinate is the heating capacity value with the unit of W, and the abscissa is the heating operation time with the unit of min.
It should be understood that the target inner disc temperature represents that the heating capacity value of the air conditioner is in a preset target heating capacity interval corresponding to the target heating capacity value as the heating operation time of the air conditioner is increased under the target inner disc temperature. Fig. 3 shows a heating capacity curve in which the actual inner panel temperature of the air conditioner is controlled to be maintained at the target inner panel temperature when the ambient temperature is 2 ℃ for heating, that is, the heating capacity value of the air conditioner is changed according to the heating operation time when the actual inner panel temperature of the air conditioner is maintained at 43 ℃ in the present embodiment. It can be seen that after the heating capacity value is gradually increased for a period of time, the heating capacity value of the air conditioner is approximately maintained within the preset target heating capacity interval corresponding to the target heating capacity value for another period of time. For example, if the target heating capacity value is set to 8000W, the preset target heating capacity interval corresponding to the target heating capacity value is (8000 ± P) W, where P is set according to actual needs. Thus, the heating capacity value of the air conditioner can be maintained at a high target heating capacity value for a long time, the attenuation of the heating capacity can be effectively reduced, and the energy efficiency can be improved.
Referring to fig. 4, in the present embodiment, the step S200 includes the following sub-steps:
and a substep S210 of determining an operation frequency variation value of a compressor of the air conditioner according to the actual inner disc temperature and the target inner disc temperature when the air conditioner is in a heating mode.
And a substep S220 of calculating a target operating frequency of the compressor according to the current operating frequency and the operating frequency variation value of the compressor.
Wherein the target operating frequency of the compressor is calculated according to the following formula:
F＝F0+△F；
wherein F represents the target operating frequency, F0Indicating the current operating frequency and deltaf the operating frequency variation value.
In this embodiment, the current operating frequency of the compressor is detected every 60 s. The maximum frequency of the heating compressor is 100 Hz.
And a substep S230 of controlling the compressor to actually operate at the target operation frequency so that the actual inner disc temperature is maintained at the target inner disc temperature.
It should be understood that, in this embodiment, by controlling the frequency of the compressor, the actual inner disc temperature is maintained at the target inner disc temperature, the control is more accurate, the attenuation of the heating capability can be effectively reduced, and the energy efficiency is improved.
Referring to fig. 5, further, in order to more accurately determine the operating frequency variation value, the sub-step S210 may include the following sub-steps.
And a substep S310 of determining whether a difference between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a first preset value and less than or equal to a second preset value.
The first preset value and the second preset value can be set correspondingly according to actual needs. In this embodiment, the first preset value is smaller than the second preset value, the first preset value is smaller than 0, and the second preset value is greater than 0. Optionally, the first preset value is-0.5 ℃ and the second preset value is 0.5 ℃. In addition, the actual inner disc temperature is represented by T1, and the target inner disc temperature is represented by T, then in the substep S310, it is judged whether the difference between the actual inner disc temperature and the target inner disc temperature satisfies-0.5 ℃ to-T1-T to-0.5 ℃.
In addition, in this embodiment, if the exhaust temperature is lower than the third exhaust temperature, the substep S310 is executed.
In the substep S320, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than or equal to the first preset value and less than or equal to the second preset value, the operating frequency variation value is set to 0.
It should be understood that the difference between the actual inner disc temperature and the target inner disc temperature is greater than or equal to the first preset value and less than or equal to the second preset value, i.e., -0.5 ℃ ≦ T1-T ≦ 0.5 ℃, it may be considered that the actual inner disc temperature is approximately close to the target inner disc temperature, it may not be necessary to adjust the actual inner disc temperature, and thus, setting the operating frequency variation value to 0, i.e., setting Δ F to 0, indicates that the current operating frequency of the compressor is controlled to be constant.
In the substep S330, if the difference between the actual inner disc temperature and the target inner disc temperature is not greater than or equal to the first preset value and is less than or equal to the second preset value, it is determined whether the difference between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value.
In the embodiment, if the difference between the actual inner disc temperature and the target inner disc temperature does not satisfy T1-T between-0.5 ℃ and 0.5 ℃, whether T1-T is more than 0.5 ℃ is judged.
In the substep S340, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value, the operating frequency variation value is set to a frequency value less than 0.
It should be understood that if the difference between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value, it is considered that the actual inner disc temperature is higher than the target inner disc temperature, and at this time, the operation frequency variation value is set to a frequency value less than 0, which indicates that the compressor frequency is decreased to decrease the actual inner disc temperature.
Referring to fig. 6, the sub-step S340 includes the following sub-steps:
in the substep S341, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value, it is determined whether the difference between the actual inner disc temperature and the target inner disc temperature is less than a third preset value, where the third preset value is greater than the second preset value.
The third preset value is set according to actual needs, and in this embodiment, the third preset value is 2 ℃. That is, it is judged whether or not the difference between the actual inner disc temperature and the target inner disc temperature satisfies 0.5 ℃ < T1-T < 2 ℃.
In the substep S342, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value and less than the third preset value, the operating frequency variation value is set to be the first frequency variation value less than 0.
The first frequency variation value is set correspondingly according to needs, and in this embodiment, the first frequency variation value is-3 Hz. That is, Δ F ═ 3Hz when 0.5 ℃ < T1-T < 2 ℃. Thereby reducing the compressor frequency by 3 Hz.
In the substep S343, if the difference between the actual inner tray temperature and the target inner tray temperature is greater than or equal to the third preset value, it is determined whether the difference between the actual inner tray temperature and the target inner tray temperature is less than a fourth preset value, where the fourth preset value is greater than the third preset value.
The fourth preset value is set according to actual needs, and in this embodiment, the fourth preset value is 5 ℃. Namely, whether the difference between the actual inner disc temperature and the target inner disc temperature meets T1-T < 5 ℃ of more than or equal to 2 ℃ is judged.
In the sub-step S344, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than or equal to the third preset value and less than the fourth preset value, the operating frequency variation value is set as a second frequency variation value, where the second frequency variation value is less than the first frequency variation value.
The second frequency variation value is set according to actual needs, and in this embodiment, the second frequency variation value is-5 Hz. That is, when 2 ℃. ltoreq.T 1-T < 5 ℃, Δ F ═ 5 Hz. Thereby reducing the compressor frequency by 5 Hz.
In the sub-step S345, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a fourth preset value, the operating frequency variation value is set to be a third frequency variation value, wherein the third frequency variation value is smaller than the second frequency variation value.
The third frequency variation value is set according to actual needs, and in this embodiment, the third frequency variation value is-8 Hz. That is, when T1-T.gtoreq.5 ℃, Δ F ═ 8 Hz. Thereby reducing the compressor frequency by 8 Hz.
It should be understood that if the difference between the actual inner disc temperature and the target inner disc temperature is greater than or equal to the third preset value, the operating frequency variation value is set to a frequency value that is less than the first frequency variation value. In addition, a judgment reference value larger than the fourth preset value may be set, and as the judgment reference value increases, the frequency variation value corresponding to the judgment reference value decreases.
With continued reference to fig. 5, the substep S210 may further include a substep S350.
In the substep S350, if the difference between the actual inner disc temperature and the target inner disc temperature is less than the first preset value, the operating frequency variation value is set to a frequency value greater than 0.
It should be understood that if the difference between the actual inner disc temperature and the target inner disc temperature is less than the first preset value, it is considered that the actual inner disc temperature is lower than the target inner disc temperature, and at this time, the operation frequency variation value is set to a frequency value greater than 0, which indicates that the compressor frequency is increased to increase the actual inner disc temperature.
Referring to fig. 7, in the present embodiment, the sub-step S350 may include the following sub-steps.
In the substep S351, if the difference between the actual inner disc temperature and the target inner disc temperature is smaller than the first preset value, it is determined whether the difference between the actual inner disc temperature and the target inner disc temperature is greater than a fifth preset value, wherein the fifth preset value is smaller than the first preset value.
The fifth preset value is set according to actual needs, and in this embodiment, the fifth preset value is-2 ℃. That is, it is judged whether or not the difference between the actual inner disc temperature and the target inner disc temperature satisfies-2 ℃ < T1-T < -0.5 ℃.
In the substep S352, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than the fifth preset value and less than the first preset value, the operating frequency variation value is set to a fourth frequency variation value greater than 0.
The fourth frequency variation value is set according to actual needs, and in this embodiment, the fourth frequency variation value is 3 Hz. That is, when-2 ℃ < T1-T < -0.5 ℃, Δ F ═ 3 Hz. Thereby raising the compressor frequency by 3 Hz.
In the substep S353, if the difference between the actual inner disc temperature and the target inner disc temperature is less than or equal to a fifth preset value, it is determined whether the difference between the actual inner disc temperature and the target inner disc temperature is greater than a sixth preset value, wherein the sixth preset value is less than the fifth preset value.
The sixth preset value is set according to actual needs, and in this embodiment, the sixth preset value is-5 ℃. That is, whether the difference between the actual inner tray temperature and the target inner tray temperature satisfies-5 ℃ and T1-T and-2 ℃ is judged.
In the sub-step S354, if the difference between the actual inner disc temperature and the target inner disc temperature is greater than the sixth preset value and less than or equal to the fifth preset value, the operating frequency variation value is set as a fifth frequency variation value, wherein the fifth frequency variation value is greater than the fourth frequency variation value.
The fifth frequency variation value is set according to actual needs, and in this embodiment, the fifth frequency variation value is 5 Hz. That is, when-5 ℃ < T1-T.ltoreq.2 ℃, Δ F is 5 Hz. Thereby raising the compressor frequency by 5 Hz.
In the sub-step S355, if the difference between the actual inner disc temperature and the target inner disc temperature is less than or equal to a sixth preset value, the operating frequency variation value is set as a sixth frequency variation value, wherein the sixth frequency variation value is greater than the fifth frequency variation value.
The sixth frequency variation value is set according to actual needs, and in this embodiment, the sixth frequency variation value is 8 Hz. That is, when T1-T.ltoreq.5 ℃, Δ F is 8 Hz. Thereby raising the compressor frequency by 8 Hz.
It should be understood that if the difference between the actual inner disc temperature and the target inner disc temperature is less than or equal to the fifth preset value, the operating frequency variation value is set to a frequency value greater than the fourth frequency variation value. In addition, a judgment reference value smaller than the sixth preset value may be set, and the frequency variation value corresponding to the judgment reference value is larger as the judgment reference value decreases.
Referring to fig. 1, the method for controlling an air conditioner according to an embodiment of the present invention further includes:
step S400, if the actual inner disc temperature is lower than the critical inner disc temperature and the duration is longer than the preset time, the air conditioner is controlled to enter a defrosting mode from a heating mode, wherein the critical inner disc temperature is lower than the target inner disc temperature.
It should be noted that the proximity to the inner panel temperature indicates an inner panel temperature condition in which the air conditioner enters the defrosting mode from the heating mode. The critical inner disc temperature and the preset time are correspondingly set according to actual needs. In this embodiment, the preset time is 2 min. In addition, the critical inner disk temperature is 1 to 5 ℃ lower than the target inner disk temperature. In this embodiment, optionally, the critical inner disc temperature is lower than the target inner disc temperature by 3 ℃, for example, the target inner disc temperature is 43 ℃, and the critical inner disc temperature is 40 ℃. And when the actual inner disc temperature T1 is less than 40 ℃ and the duration time is more than 2min, entering a defrosting mode.
It should be noted that the critical inner disc temperature is 1 to 5 ℃ lower than the target inner disc temperature, that is, the critical inner disc temperature is lower than the target inner disc temperature and closer to the target inner disc temperature. Therefore, the attenuation rate of the heating capacity value is small, the air outlet temperature change of the air conditioner is small, and the indoor comfort of heating operation can be ensured.
In addition, it should be noted that there are many judgment conditions for the air conditioner to enter the defrosting mode from the heating mode, and the air conditioner can enter the defrosting mode when any one of the judgment conditions is satisfied. The judgment is only one of the actual inner panel temperature, and the control method of the air conditioner provided by the embodiment of the invention only discusses the mode that other judgment conditions can still be adopted by the mode that the actual inner panel temperature is lower than the critical inner panel temperature.
In order to execute possible steps of the control method of the air conditioner provided by the above embodiment, the embodiment of the invention also provides a control device of the air conditioner. The control device of the air conditioner is applied to the air conditioner and comprises a control module. The control module may be configured to perform any one of the steps of the control method of the air conditioner described above. It should be noted that the basic principle and the technical effects of the control device of the air conditioner provided in the present embodiment are substantially the same as those of the above embodiments, and for the sake of brief description, no part of the present embodiment is mentioned, and reference may be made to the corresponding contents in the above embodiments.
For example, the control module is used for controlling the actual inner disc temperature of the air conditioner to be maintained at a target inner disc temperature when the air conditioner is in a heating mode, wherein the target inner disc temperature is determined by a target heating capacity value of the air conditioner in the heating mode. The control module may perform step S200 and its sub-steps described above to achieve the corresponding technical effect.
For example, the control module is further configured to control the air conditioner to enter a defrosting mode from a heating mode if the actual inner disc temperature is lower than the critical inner disc temperature and the duration is greater than a preset time, wherein the critical inner disc temperature is lower than the target inner disc temperature. The control module may perform step S400 described above to achieve a corresponding technical effect.
In addition, the control module can also execute the steps 110 to 160 to judge the working condition of the compressor according to the exhaust temperature of the compressor.
In addition, the embodiment of the invention also provides an air conditioner which comprises a controller. The controller is used for executing computer instructions to realize the control method of the air conditioner in the embodiment.
The controller may be an integrated circuit chip having signal processing capabilities. The controller may be a general-purpose processor, and may include a Central Processing Unit (CPU), a single chip Microcomputer (MCU), a Micro Controller Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an embedded ARM, and other chips, where the controller may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present invention.
In a possible implementation manner, the air conditioner may further include a memory for storing program instructions executable by the controller, for example, the control device of the air conditioner provided in the embodiment of the present application, and the control device of the air conditioner provided in the embodiment of the present application includes at least one of software and firmware stored in the memory. The Memory may be a stand-alone external Memory including, but not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Read-Only Memory (EPROM), electrically Erasable Read-Only Memory (EEPROM). The memory may also be integrated with the controller, for example, the memory may be integrated with the controller on the same chip.
In summary, embodiments of the present invention provide a control method and an apparatus for an air conditioner, and an air conditioner, in which the air conditioner may determine a target inner pan temperature according to a required target heating capacity value, and maintain an actual inner pan temperature of the air conditioner at the target inner pan temperature, so that a heating capacity of the air conditioner can meet a requirement, a heating time may be prolonged, a problem of a large attenuation rate of a heating operation of the air conditioner may be solved without adding any device structure, a cost is saved, and a heating energy efficiency of the air conditioner is improved. And the running frequency of the compressor is changed according to the temperature of the inner disc, so that the frosting speed can be delayed.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (14)

1. A method of controlling an air conditioner, comprising:
controlling an actual inner disc temperature of an air conditioner to be maintained at a target inner disc temperature when the air conditioner is in a heating mode, wherein the target inner disc temperature is determined by a target heating capacity value of the air conditioner in the heating mode;
and if the actual inner disc temperature is lower than the critical inner disc temperature and the duration time is longer than the preset time, controlling the air conditioner to enter a defrosting mode from the heating mode, wherein the critical inner disc temperature is lower than the target inner disc temperature.
2. The method of claim 1, wherein when the heating capacity value of the air conditioner reaches the target heating capacity value and a slope of a curve that decreases with a heating operation time is higher than a preset value, an actual inner panel temperature corresponding to the heating capacity value is the target inner panel temperature.
3. The method of claim 2, wherein the target inner panel temperature indicates that the heating capacity value of the air conditioner is within a preset target heating capacity interval corresponding to the target heating capacity value as the heating operation time of the air conditioner increases at the target inner panel temperature.
4. The control method of an air conditioner according to claim 1, wherein the critical inner panel temperature is 1-5 ℃ lower than the target inner panel temperature.
5. The method of claim 1, wherein the controlling of the actual inner panel temperature of the air conditioner to be maintained at the target inner panel temperature while the air conditioner is in the heating mode comprises:
determining an operation frequency change value of a compressor of the air conditioner according to the actual inner disc temperature and the target inner disc temperature when the air conditioner is in the heating mode;
calculating a target operating frequency of the compressor according to the current operating frequency of the compressor and the operating frequency variation value;
controlling the compressor to actually operate at the target operation frequency so that the actual inner disc temperature is maintained at the target inner disc temperature.
6. The control method of an air conditioner according to claim 5, wherein the step of calculating the target operating frequency of the compressor depending on the current operating frequency of the compressor and the operating frequency variation value includes:
calculating the target operating frequency of the compressor according to the following formula:
F＝F0+△F；
wherein F represents the sameTarget operating frequency, F0And represents the current operating frequency, and deltaF represents the operating frequency change value.
7. The control method of an air conditioner according to claim 5, wherein the step of determining an operation frequency variation value of a compressor of the air conditioner according to the actual inner panel temperature and the target inner panel temperature while the air conditioner is in the heating mode comprises:
judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a first preset value and less than or equal to a second preset value or not;
if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a first preset value and less than or equal to a second preset value, setting the operating frequency variation value to be 0;
if the difference value between the actual inner disc temperature and the target inner disc temperature is not greater than or equal to a first preset value and is less than or equal to a second preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is larger than the second preset value, setting the operation frequency variation value as a frequency value smaller than 0;
and if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than the first preset value, setting the operation frequency variation value as a frequency value larger than 0.
8. The method of claim 7, wherein the step of setting the operation frequency variation value to a frequency value less than 0 if the difference between the actual inner panel temperature and the target inner panel temperature is greater than the second preset value comprises:
if the difference value between the actual inner disc temperature and the target inner disc temperature is larger than the second preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than a third preset value, wherein the third preset value is larger than the second preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than the second preset value and smaller than the third preset value, setting the operation frequency variation value to be a first frequency variation value smaller than 0; and if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a third preset value, setting the operation frequency variation value as a frequency value smaller than the first frequency variation value.
9. The method of claim 8, wherein the step of setting the operation frequency variation value to a frequency value less than the first frequency variation value if the difference between the actual inner panel temperature and the target inner panel temperature is greater than or equal to a third preset value comprises:
if the difference value between the actual inner disc temperature and the target inner disc temperature is larger than or equal to a third preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than a fourth preset value, wherein the fourth preset value is larger than the third preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a third preset value and smaller than a fourth preset value, setting the operation frequency change value as a second frequency change value, wherein the second frequency change value is smaller than the first frequency change value;
and if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than or equal to a fourth preset value, setting the operation frequency variation value as a third frequency variation value, wherein the third frequency variation value is smaller than the second frequency variation value.
10. The method of claim 7, wherein if the difference between the actual inner panel temperature and the target inner panel temperature is less than the first preset value, the step of setting the operation frequency variation value to a frequency value greater than 0 comprises:
if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than the first preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is larger than a fifth preset value, wherein the fifth preset value is smaller than the first preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is larger than the fifth preset value and smaller than the first preset value, setting the operation frequency variation value to be a fourth frequency variation value larger than 0;
and if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than or equal to the fifth preset value, setting the operation frequency variation value as a frequency value larger than the fourth frequency variation value.
11. The method of claim 10, wherein if the difference between the actual inner panel temperature and the target inner panel temperature is less than or equal to the fifth preset value, the step of setting the operation frequency variation value to a frequency value greater than the fourth frequency variation value comprises:
if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than or equal to the fifth preset value, judging whether the difference value between the actual inner disc temperature and the target inner disc temperature is larger than a sixth preset value, wherein the sixth preset value is smaller than the fifth preset value;
if the difference value between the actual inner disc temperature and the target inner disc temperature is greater than the sixth preset value and less than or equal to the fifth preset value, setting the operation frequency variation value as a fifth frequency variation value, wherein the fifth frequency variation value is greater than the fourth frequency variation value;
and if the difference value between the actual inner disc temperature and the target inner disc temperature is smaller than or equal to the sixth preset value, setting the operation frequency change value as a sixth frequency change value, wherein the sixth frequency change value is larger than the fifth frequency change value.
12. The method as claimed in any one of claims 1 to 11, further comprising, before the step of controlling the actual inner panel temperature of the air conditioner to be maintained at the target inner panel temperature while the air conditioner is in the heating mode:
judging whether the exhaust temperature of a compressor of the air conditioner is greater than or equal to a first exhaust temperature;
if the exhaust temperature is greater than or equal to a first exhaust temperature, controlling the compressor to stop;
if the exhaust temperature is lower than the first exhaust temperature, judging whether the exhaust temperature is higher than or equal to a second exhaust temperature and lower than the first exhaust temperature;
if the exhaust temperature is greater than or equal to a second exhaust temperature and less than the first exhaust temperature, controlling the current operation frequency of the compressor to be reduced;
if the exhaust temperature is lower than the second exhaust temperature, judging whether the exhaust temperature is higher than or equal to a third exhaust temperature and lower than the second exhaust temperature;
if the exhaust temperature is greater than or equal to a third exhaust temperature and less than the second exhaust temperature, controlling the compressor to prohibit frequency increase;
and if the exhaust temperature is lower than the third exhaust temperature, controlling the actual inner disc temperature of the air conditioner to be maintained at the target inner disc temperature when the air conditioner is in the heating mode.
13. A control apparatus of an air conditioner, comprising:
the control module is used for controlling the actual inner disc temperature of the air conditioner to be maintained at a target inner disc temperature when the air conditioner is in a heating mode, wherein the target inner disc temperature is determined by a target heating capacity value of the air conditioner in the heating mode;
the control module is further used for controlling the air conditioner to enter a defrosting mode from the heating mode if the actual inner disc temperature is lower than the critical inner disc temperature and the duration is longer than the preset time, wherein the critical inner disc temperature is lower than the target inner disc temperature.
14. An air conditioner comprising a controller for executing computer instructions to implement the control method of the air conditioner according to any one of claims 1 to 12.
CN201911000158.8A 2019-10-21 2019-10-21 Control method and device of air conditioner and air conditioner Active CN110645682B (en)

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