CN112050436B - Control method of air conditioner - Google Patents
Control method of air conditioner Download PDFInfo
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- CN112050436B CN112050436B CN201910488262.XA CN201910488262A CN112050436B CN 112050436 B CN112050436 B CN 112050436B CN 201910488262 A CN201910488262 A CN 201910488262A CN 112050436 B CN112050436 B CN 112050436B
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- 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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioning, in particular to a control method of an air conditioner. The invention aims to solve the problems of long waiting time and poor user experience when the existing air conditioner runs in a cold air prevention mode. To this end, the control method of the present invention includes: when the air conditioner is in a shutdown state, acquiring the outdoor environment temperature; judging the magnitude of the outdoor environment temperature and the first preset environment temperature; when the outdoor environment temperature is less than or equal to a first preset environment temperature, controlling the compressor to operate at a heat storage frequency; the outdoor fan is controlled to operate simultaneously with, before, or after the compressor starts operating. Through the control mode, the control method of the air conditioner can realize the purpose of immediately discharging hot air when the air conditioner is started by storing heat in advance, and improves the user experience.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a control method of an air conditioner.
Background
When the air conditioner is started in cold winter, because the indoor and outdoor temperature is low, the air blown out after the air conditioner is started is cold air, the user experience is seriously influenced, and therefore, the existing air conditioner is started and provided with a cold air prevention mode. When the cold air prevention mode is started, the compressor and the outdoor fan are controlled to be started to store heat, and the indoor fan is controlled to operate after the temperature rises, so that the condition that cold air is blown out when the air conditioner is started is avoided.
Although the air conditioner is configured with a cold air prevention mode, the problem of blowing out cold air when the air conditioner is started is solved to a certain extent, the control mode also has the following defects inevitably. In practical application, the waiting time of the air conditioner is long due to the cold air prevention mode running within a few minutes after the air conditioner is started, so that the user can feel that the air conditioner has problems, and the user dissatisfaction and complaint are caused.
Accordingly, there is a need in the art for a new control method of an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problems of long waiting time and poor user experience when the conventional air conditioner operates in a cold air prevention mode, the present invention provides a control method of an air conditioner, wherein the air conditioner comprises a compressor, a throttling element, an outdoor heat exchanger, an outdoor fan, an indoor heat exchanger and an indoor fan, and the control method comprises:
when the air conditioner is in a shutdown state, acquiring the outdoor environment temperature;
judging the outdoor environment temperature and the first preset environment temperature;
when the outdoor environment temperature is less than or equal to a first preset environment temperature, controlling the compressor to operate at a heat storage frequency;
controlling the outdoor fan to operate simultaneously with, before, or after the compressor starts operating.
In a preferred embodiment of the above method for controlling an air conditioner, the step of controlling the compressor to operate at a heat storage frequency when the outdoor ambient temperature is less than or equal to a first preset ambient temperature further comprises:
when the outdoor environment temperature is less than or equal to the first preset environment temperature, determining a first starting frequency and a first frequency increasing speed of the compressor based on the outdoor environment temperature;
controlling the compressor to increase the frequency from the first starting frequency to the heat storage frequency at the first increasing frequency speed.
In a preferred embodiment of the above method for controlling an air conditioner, the method further includes:
detecting the coil temperature of the indoor heat exchanger during the operation of the compressor at the heat accumulation frequency;
judging the sizes of the coil temperature and a first preset coil temperature;
selectively controlling the compressor and the outdoor fan to stop operating based on the determination result.
In a preferred embodiment of the control method of the air conditioner, the step of selectively controlling the compressor and the outdoor fan to stop operating based on the determination result further includes:
and when the temperature of the coil pipe is greater than the first preset temperature of the coil pipe, controlling the compressor and the outdoor fan to stop running.
In a preferred embodiment of the control method of the air conditioner, after the step of "controlling the compressor and the outdoor fan to stop operating", the control method further includes:
detecting the temperature of the coil;
judging the temperature of the coil and the temperature of a second preset coil;
selectively controlling the compressor and the outdoor fan to be turned on based on the comparison result;
wherein the first preset coil temperature is greater than the second preset coil temperature.
In a preferred embodiment of the control method of the air conditioner, the step of selectively controlling the compressor and the outdoor fan to be turned on based on the comparison result further includes:
and when the coil temperature is less than or equal to the second preset coil temperature, controlling the compressor to operate at the heat storage frequency and controlling the outdoor fan to be started.
In a preferred embodiment of the above method for controlling an air conditioner, the method further includes:
and when the outdoor environment temperature is higher than the first preset environment temperature, controlling the air conditioner to keep a shutdown state.
In a preferred embodiment of the above method for controlling an air conditioner, after the step of "controlling the air conditioner to maintain the stopped state", the method further includes:
when a starting-up instruction is received, acquiring the outdoor environment temperature;
judging the outdoor environment temperature and a second preset environment temperature;
controlling the compressor to increase frequency in stages based on the judgment result;
wherein the second preset ambient temperature is greater than the first preset ambient temperature.
In a preferred embodiment of the above method for controlling an air conditioner, the step of "controlling the compressor to increase the frequency in stages based on the determination result" further includes:
when the outdoor environment temperature is greater than the second preset environment temperature, determining a second starting frequency and a second frequency increasing speed of the compressor based on the outdoor environment temperature;
controlling the compressor to increase the frequency from the second starting frequency to a first oil return frequency at the second increasing frequency speed;
when the compressor is raised to the first oil return frequency, controlling the compressor to operate for a first oil return time at the first oil return frequency;
and when the compressor runs at the first oil return frequency for the first oil return time, controlling the compressor to be upscaled to a target frequency at the second frequency increasing speed.
In a preferred embodiment of the above method for controlling an air conditioner, the step of "controlling the compressor to increase the frequency in stages based on the determination result" further includes:
determining a third starting frequency and a third frequency increasing speed of the compressor based on the outdoor environment temperature when the outdoor environment temperature is less than or equal to the second preset environment temperature and greater than the first preset environment temperature;
controlling the compressor to ramp up from the third start-up frequency to the first oil return frequency at the third ramp-up speed;
when the compressor is up-converted to the first oil return frequency, controlling the compressor to run at the first oil return frequency for a second oil return time;
when the compressor runs at the first oil return frequency for the second oil return time, controlling the compressor to increase the frequency to a second oil return frequency at the third frequency increasing speed;
when the compressor is raised to the second oil return frequency, controlling the compressor to run for a third oil return time at the second oil return frequency;
and when the compressor runs at the second oil return frequency for the third oil return time, controlling the compressor to increase the frequency to the target frequency at the third frequency increasing speed.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, an air conditioner includes a compressor, a throttling element, an outdoor heat exchanger and an outdoor fan, and an indoor heat exchanger and an indoor fan, and a control method includes: when the air conditioner is in a shutdown state, acquiring the outdoor environment temperature; judging the magnitude of the outdoor environment temperature and the first preset environment temperature; when the outdoor environment temperature is less than or equal to a first preset environment temperature, controlling the compressor to operate at a heat storage frequency; the outdoor fan is controlled to operate simultaneously with, before, or after the compressor starts operating.
Through the control mode, the control method of the air conditioner can realize the purpose of immediately outputting hot air when the air conditioner is started through the advance heat storage, improve the user experience, and solve the problems of long waiting time and poor user experience when the air conditioner is operated in a cold air prevention mode. Particularly, through when outdoor ambient temperature is less than or equal to first preset ambient temperature, control compressor heat accumulation operation for can effectively carry out the heat accumulation to indoor heat exchanger's coil pipe when the air conditioner is in the shutdown state, make the coil pipe keep certain temperature, thereby blow off hot-blast immediately when the user starts the air conditioner, promote user experience.
Further, through the in-process at the compressor with the operation of heat accumulation frequency, detect indoor heat exchanger's coil pipe temperature and adjust the switching of compressor and outdoor fan based on the coil pipe temperature and the comparative result of first predetermined temperature for the air conditioner is in a comparatively stable temperature interval all the time at heat accumulation stage coil pipe temperature, and the assurance user goes out hot-blast when opening the air conditioner immediately.
Furthermore, the air conditioner is kept in a shutdown state when the outdoor environment temperature is higher than the first preset environment temperature, and the compressor is controlled to increase frequency in stages based on the outdoor environment temperature after the starting instruction is received.
Drawings
A control method of an air conditioner of the present invention is described below with reference to the accompanying drawings. In the drawings:
fig. 1 is a flowchart of a control method of an air conditioner in a first embodiment of the present invention;
fig. 2 is a logic diagram of a control method of an air conditioner in a first embodiment of the present invention;
fig. 3 is a flowchart of a control method of an air conditioner in a second embodiment of the present invention;
fig. 4 is a flowchart of a control method of an air conditioner in a third embodiment of the present invention;
fig. 5 is a flowchart of a method for controlling an air conditioner according to a fourth embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present embodiment is described with an example in which the operation of the outdoor fan is controlled to be turned on while the compressor starts to operate, a person skilled in the art may adjust the sequence of turning on the compressor and the fan without departing from the principle of the present invention. For example, the outdoor fan may be controlled to operate before or after the compressor is turned on.
Example 1
First, referring to fig. 1 and 2, a control method of an air conditioner of the present invention will be described. Wherein, fig. 1 is a flow chart of a control method of an air conditioner of the present invention; fig. 2 is a logic diagram of a control method of an air conditioner according to the present invention.
As shown in fig. 1, in order to solve the problems of long waiting time and poor user experience when the conventional air conditioner operates in the cold-proof mode, the air conditioner of the present invention includes a compressor, a throttling element, an outdoor heat exchanger, an outdoor fan, an indoor heat exchanger, and an indoor fan. The control method of the air conditioner mainly comprises the following steps:
s101, when the air conditioner is in a stop state, acquiring the outdoor environment temperature; when the air conditioner is in a stop state, the outdoor environment temperature is detected by a temperature sensor arranged on an outdoor unit of the air conditioner.
S102, judging the outdoor environment temperature and the first preset environment temperature; for example, the first preset ambient temperature is 5 ℃, and after the outdoor ambient temperature is obtained, the outdoor ambient temperature and the 5 ℃ are determined.
S103, when the outdoor environment temperature is less than or equal to a first preset environment temperature, controlling the compressor to operate at a heat storage frequency; for example, when the outdoor ambient temperature is 0 ℃ and the heat storage frequency is 40Hz, the waiting time for the air conditioner to operate in the cold air prevention mode is long and the compressor cannot rapidly increase the frequency by operating at a high frequency when the outdoor ambient temperature is less than 5 ℃. At the moment, the compressor is controlled to run at the heat storage frequency of 40Hz, and the coil pipe of the indoor heat exchanger can be subjected to heat storage when the air conditioner is in a shutdown state, so that a user can skip the cold air prevention mode to directly discharge hot air when opening the air conditioner.
S104, controlling the outdoor fan to operate while, before or after the compressor starts to operate; for example, the outdoor fan is controlled to start operation while the compressor starts operation. Of course, the starting time of the outdoor fan may be before or after the compressor starts to operate, as long as the outdoor fan is correspondingly started to operate when the compressor operates.
Through the control mode, the control method of the air conditioner can realize the purpose of immediately outputting hot air when the air conditioner is started through the advance heat storage, improve the user experience, and solve the problems of long waiting time and poor user experience when the air conditioner is operated in a cold air prevention mode. Particularly, through when outdoor ambient temperature is less than or equal to first preset ambient temperature, control compressor heat accumulation operation for can effectively carry out the heat accumulation to indoor heat exchanger's coil pipe when the air conditioner is in the shutdown state, make the coil pipe keep certain temperature, thereby blow off hot-blast immediately when the user starts the air conditioner, save the time of waiting for cold wind prevention mode operation, promote user experience.
A control method of an air conditioner of the present invention will be described in detail with reference to fig. 1 and 2.
As shown in fig. 1 and fig. 2, in a preferred embodiment, step S103 may further include: when the outdoor environment temperature is less than or equal to a first preset environment temperature, determining a first starting frequency and a first frequency increasing speed of the compressor based on the outdoor environment temperature; the compressor is controlled to be increased from the first starting frequency to the heat storage frequency at a first increasing frequency speed. For example, the first preset ambient temperature may be 5 ℃, the first start frequency may be 30Hz, the heat storage frequency may be 40Hz, and the first frequency increasing speed may be 1 Hz/s. When the outdoor temperature is less than or equal to the first preset environment temperature, the outdoor temperature is low, the viscosity of lubricating oil in the compressor is high, and the lubrication is poor, so that the first starting frequency and the first frequency increasing speed are set to be relatively low, and the compressor is slowly increased to the heat storage frequency.
Further, in a preferred embodiment, the control method further includes:
detecting the temperature of a coil pipe of an indoor heat exchanger in the process that a compressor runs at a heat storage frequency; judging the temperature of the coil and the temperature of a first preset coil; and selectively controlling the compressor and the outdoor fan to stop running based on the judgment result. Specifically, when the temperature of the coil pipe is greater than a first preset coil pipe temperature, the compressor and the outdoor fan are controlled to stop running; and when the temperature of the coil pipe is less than or equal to the first preset temperature of the coil pipe, controlling the compressor and the outdoor fan to keep running. For example, the first preset coil temperature may be 40 ℃, and when the air conditioner is storing heat, the coil temperature is controlled to be about 40 ℃ to ensure that hot air is discharged when the air conditioner is started. After the compressor runs for a period of time in the heat storage mode, when the temperature of the coil pipe is higher than 40 ℃, the temperature of the coil pipe is proved to exceed the better temperature, the temperature rise speed of the coil pipe needs to be slowed down, and energy waste is avoided. At this time, the pressure of the system is reduced by controlling the compressor and the outdoor fan to be closed, the phase change process of the refrigerant is stopped, and the temperature rising speed of the coil pipe begins to slow down, maintain and finally fall. When the temperature of the coil is less than 40 ℃, the coil temperature is proved to be still low, and the rapid temperature rise is still needed. At the moment, the compressor is kept running at the heat storage frequency, and the outdoor fan is controlled to keep running, so that the temperature rise speed of the coil pipe temperature can be ensured, and the coil pipe temperature continues to rise.
Further, after the step of "controlling the compressor and the outdoor fan to stop operating" when the coil is more than 40 ℃, the control method further comprises the following steps:
detecting the temperature of the coil; judging the temperature of the coil and the temperature of a second preset coil; and selectively controlling the compressor and the outdoor fan to be started based on the comparison result. Specifically, when the temperature of the coil is less than or equal to a second preset coil temperature, the compressor is controlled to operate at the heat storage frequency, and the outdoor fan is controlled to be started; when the temperature of the coil is less than or equal to the first preset coil temperature and greater than the second preset coil temperature, controlling the compressor and the outdoor fan to keep a closing state; wherein the first preset coil temperature is greater than the second preset coil temperature. For example, the second predetermined coil temperature may be 35 ℃, and when the coil temperature is less than 35 ℃, it is proved that the coil temperature has dropped to a lower temperature, and the temperature rise rate needs to be increased immediately. At the moment, the compressor is controlled to operate at the heat storage frequency, and the outdoor fan is controlled to be started, so that the pressure of the system is increased, the phase change process of the refrigerant is recovered, and the temperature of the coil pipe begins to rise to some extent. When the temperature of the coil is more than 35 ℃ and less than 40 ℃, the temperature of the coil is still high, and the coil can be kept to be cooled continuously in order to avoid energy waste. At the moment, the temperature of the coil pipe can be ensured to be slowly reduced by controlling the compressor and the outdoor fan to be kept closed.
The control method can effectively reduce the energy consumption of the air conditioner on the premise of ensuring the stable change of the temperature of the coil pipe. When the temperature of the coil pipe is reduced to be less than or equal to the second preset coil pipe temperature, the compressor is controlled to be started and run with the heat storage frequency, the outdoor fan is controlled to be started, the system pressure can be improved, the temperature of the coil pipe is further improved, and the temperature of the coil pipe is guaranteed to be always in a better interval.
Referring to fig. 2, in a preferred embodiment, the control method further includes:
and when the outdoor environment temperature is higher than the first preset environment temperature, controlling the air conditioner to keep a shutdown state. For example, the first preset temperature may also be 5 ℃, when the outdoor environment temperature is greater than the first preset temperature, the outdoor environment temperature is higher, the compressor runs in the anti-cold wind mode for a shorter time, and even if the anti-cold wind mode is not run, the air conditioner has a condition of fast frequency increase when being started due to the higher outdoor environment temperature.
Further, after the step of 'controlling the air conditioner to maintain the stopped state', the control method further includes:
when a starting-up instruction is received, acquiring the outdoor environment temperature; judging the outdoor environment temperature and the second preset environment temperature; controlling the compressor to increase frequency in stages based on the judgment result; and the second preset environment temperature is greater than the first preset environment temperature. Specifically, when the outdoor ambient temperature is greater than a second preset ambient temperature, first determining a second starting frequency and a second frequency increasing speed of the compressor based on the outdoor ambient temperature; secondly, controlling the compressor to increase the frequency from the second starting frequency to the first oil return frequency at a second increasing speed and stay for the first oil return time; and then controlling the compressor to increase the frequency to the target frequency at the second increasing frequency speed. When the outdoor environment temperature is less than or equal to a second preset environment temperature and greater than the first preset environment temperature, firstly, determining a third starting frequency and a third frequency increasing speed of the compressor based on the outdoor environment temperature; secondly, controlling the compressor to increase the frequency from the third starting frequency to the first oil return frequency at a third frequency increasing speed and stay for a second oil return time; then controlling the compressor to increase the frequency to a second oil return frequency at a third frequency increasing speed and stay for a third oil return time; and finally, controlling the compressor to increase the frequency to the target frequency at the third frequency increasing speed.
For example, the second preset ambient temperature may be 15 ℃, the second start frequency may be 50Hz, the second boost speed may be 2Hz/s, the first oil return frequency may be 68Hz, the first oil return time may be 30s, and the target frequency may be a maximum frequency of the compressor, such as 120 Hz. When the outdoor environment temperature is further higher than 15 ℃, the outdoor environment temperature is proved to be higher at the moment, which is beneficial to the quick start and oil return of the compressor, at the moment, the second start frequency and the second frequency-raising speed can be set to be relatively higher, only one oil return frequency is set, and the first oil return time staying at the oil return frequency is set to be relatively shorter, so that the compressor can quickly raise the frequency to the maximum frequency in a very short time on the premise of ensuring the oil return effect, and hot air can be blown out in a very short time. Therefore, when the outdoor environment temperature is judged to be higher than 15 ℃, the compressor is controlled to start at the starting frequency of 50Hz, the frequency is quickly increased to 68Hz at the speed of 2Hz/s, and then the 68Hz frequency is kept for running for 30s, so that the oil return effect of the compressor is ensured; and then, controlling the compressor to directly increase from 68Hz to 120Hz at an increasing speed of 2Hz/s so as to realize quick hot air outlet of the air conditioner.
As another example, the third start frequency may be 40Hz, the third ramp rate may be 1Hz/s, the second oil return frequency may be 88Hz, and the second and third oil return times may be 60 s. When the outdoor environment temperature is higher than 5 ℃ but lower than 15 ℃, the outdoor environment temperature is proved to be higher than 5 ℃ but not enough to quickly start and smoothly return oil to the compressor, at the moment, the third starting frequency and the third frequency-raising speed can be set relatively lower, two oil-returning frequencies of 68Hz and 88Hz are set for ensuring the oil-returning effect, and the second oil-returning time and the third oil-returning time which stay at the oil-returning frequency are also set relatively longer, so that the compressor can raise the frequency to the maximum frequency as fast as possible on the premise of ensuring the oil-returning effect. Therefore, when the outdoor environment temperature is judged to be more than 5 ℃ but less than 15 ℃, the compressor is firstly controlled to start at the starting frequency of 40Hz, the frequency is quickly increased to 68Hz at the speed of 1Hz/s, and then the 68Hz frequency is kept for running for 60s, so that the oil return effect of the compressor is ensured; next, controlling the compressor to ascend from 68Hz to 88Hz at the ascending speed of 1Hz/s, and then keeping the frequency for 60s to ensure the oil return effect again; and finally, directly increasing the frequency to the maximum working frequency of 120Hz at the frequency increasing speed of 1Hz/s so as to realize the quick hot air outlet of the air conditioner.
By keeping the air conditioner in a shutdown state when the outdoor environment temperature is higher than the first preset environment temperature and controlling the compressor to increase frequency in stages based on the outdoor environment temperature and the second preset environment temperature after receiving the starting instruction, the control method can achieve the purpose of quick heating by directly and quickly increasing frequency when the outdoor environment temperature is relatively high, and avoids the occurrence of poor user experience caused by overlong cold wind prevention time.
Referring to fig. 2, a possible operation of the air conditioner of the present invention will be described.
As shown in fig. 2, when the air conditioner is in a shutdown state, firstly, the outdoor ambient temperature is 3 ℃, which is less than a first preset ambient temperature → based on the outdoor ambient temperature being 3 ℃, the first starting frequency of the compressor is determined to be 30Hz, the first frequency raising speed is 1Hz/s → the compressor is controlled to start at 30Hz and raise the frequency to 40Hz for heat storage operation at the speed of 1Hz/s, and simultaneously, the outdoor fan is controlled to start operation → when the temperature of the coil pipe rises to be more than 40 ℃, the compressor and the outdoor fan are controlled to stop operation to reduce the system pressure, the raising speed of the coil pipe temperature is reduced → when the temperature of the indoor coil pipe starts to reduce and is less than 35 ℃, the frequency of the compressor is controlled to raise the heat storage frequency to 40Hz for operation, and the outdoor fan is controlled to start to raise the system pressure and reduce the lowering speed of the coil pipe temperature.
It should be noted that the above preferred embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the setting manner described above, so that the present invention can be applied to more specific application scenarios.
For example, in an alternative embodiment, although the values of the first preset ambient temperature, the second preset ambient temperature and the heat storage frequency are specifically illustrated in the present embodiment, the values are only used for illustrating the principle of the present invention and are not intended to limit the protection scope of the present invention, and a person skilled in the art may adjust the values so that the adjusted values can meet more specific application scenarios. Similarly, the numerical ranges of the first preset coil temperature, the second preset coil temperature, the first starting frequency, the second starting frequency, the third starting frequency, the first frequency-increasing speed, the second frequency-increasing speed, the third frequency-increasing speed, the first oil-returning frequency, the second oil-returning frequency, the first oil-returning time, the second oil-returning time, the third oil-returning time, the target frequency, etc. can be adjusted at will as long as the adjustment satisfies the necessary size relationship among each other.
For example, in another alternative embodiment, although the present embodiment is described with an example of controlling the outdoor fan to be turned on while the compressor is started to operate, a person skilled in the art may make adjustments to the compressor and outdoor fan control sequence without departing from the principles of the present invention. For example, the start of the outdoor fan may be controlled before or after the compressor is turned on.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
Example 2
A second embodiment of the present invention will be described with reference to fig. 3. Fig. 3 is a flowchart illustrating a method for controlling an air conditioner according to a second embodiment of the present invention.
As shown in fig. 3, in one possible embodiment, the method for controlling an air conditioner includes the main steps of:
s201, when the air conditioner is in a stop state, acquiring outdoor environment temperature; when the air conditioner is in a stop state, the outdoor environment temperature is detected by a temperature sensor arranged on an outdoor unit of the air conditioner.
S202, when the outdoor environment temperature is less than or equal to a first preset environment temperature, acquiring a preset starting time of the air conditioner; for example, the outdoor environment temperature is 0 ℃, the first preset environment temperature is 5 ℃, the heat storage frequency is 40Hz, when the outdoor environment temperature is less than 5 ℃, the waiting time for the air conditioner to operate in the cold air prevention mode is long, and the compressor cannot realize rapid frequency increase through operating at a high frequency, at this time, the preset starting time of the air conditioner is firstly obtained. The preset starting time can be the starting time actively set by the user or the starting time counted based on the historical starting time of the air conditioner. For example, the preset starting time may be a starting time set by a user through a remote controller, a mobile phone APP, or a starting time obtained by counting the historical actual starting time of the air conditioner by a controller or a cloud server of the air conditioner, for example, an average value of the historical actual starting time obtained by counting the historical actual starting time of the air conditioner by using statistical methods, probability theory calculation, and the like, and the average value is used as the preset starting time of the air conditioner. The following explains the control method by taking the cloud server as an example to perform statistical calculation.
S203, correcting the preset starting-up time based on the time correction parameter; after the preset starting time is set by a user or calculated by the air conditioner, the starting time is corrected based on the time correction parameter, and if the preset starting time is corrected by increasing or decreasing a time period on the basis of the determined preset starting time, the corrected preset starting time can be closer to the real starting time of the user. For example, if the preset power-on time is 18:00 and the time correction parameter is +10min, the corrected preset power-on time is 18:00+10min, which is 18: 10.
S204, calculating the heat storage starting time of the air conditioner based on the corrected preset starting time and the preset heat storage time; after the preset startup time is corrected, the startup time of the heat storage mode may be determined based on the heat storage time. For example, if the preset heat accumulation time of the air conditioner is 5min, the heat accumulation starting time is 18:05 when the preset startup time is 18: 10.
S205, when the heat accumulation starting time is reached, controlling the compressor to operate at the heat accumulation frequency; if the cloud-end server calculates the heat accumulation starting time, when the time comes to 18:05, the compressor is controlled to operate at a certain frequency lower than the rated working frequency, for example, the heat accumulation frequency is 40Hz, and when the air conditioner operates in the heat accumulation mode, the compressor is controlled to operate at 40 Hz.
S206, controlling the outdoor fan to operate while the compressor starts to operate; for example, the outdoor fan is an ac fan, and the outdoor fan is controlled to start operation while the compressor starts to operate. Of course, the starting time of the outdoor fan may be before or after the compressor starts to operate, as long as the outdoor fan is correspondingly started to operate when the compressor operates.
As can be seen from the above description, on the basis of embodiment 1, when the outdoor ambient temperature is less than or equal to the first preset ambient temperature, the preset startup time is first obtained and the preset startup time is corrected based on the time correction parameter, the control method of the present invention can correct the preset startup time based on the startup habit of the user, so that the corrected preset startup time is closer to the real startup time of the user, and the air conditioner is subjected to heat storage based on the corrected preset startup time, which can avoid energy waste caused by insufficient heat storage time or overlong heat storage time, achieve accurate and personalized treatment for a single user, and improve user experience.
Since steps S201, S205 to S206 are the same as or similar to the control manner of embodiment 1, they are not repeated herein. The following description focuses on steps S202 to S204.
In a preferred embodiment, the time correction parameter is determined during the last operation of the air conditioner. Specifically, when the air conditioner receives a startup instruction for operation last time, if the air conditioner receives the startup instruction and operates in a heating mode in the same time period of the previous day or the same time period of the previous days, the current actual startup time is recorded first, then the historical preset startup time and the historical actual startup time in the set days before (including this time) this time are counted, and the average value of the historical preset startup time and the average value of the historical actual startup time in the set days are calculated respectively. And then calculating a first difference value between the average value of the historical actual starting-up time and the average value of the historical preset starting-up time, and storing the first difference value as a time correction parameter for the next correction of the preset starting-up time.
For example, the cloud server counts historical preset starting-up time and historical actual starting-up time of the air conditioner in the same period (e.g., 18:00-19:00) of the past 7 days including this time, and calculates a mean value of all historical preset starting-up time and a mean value of all historical actual starting-up time, if the mean value of the historical preset starting-up time is calculated to be 18:30 and the mean value of the historical actual starting-up time is calculated to be 18:40, then the first difference is equal to 18:40-18: 30-10 min, that is, the time correction parameter is 10min, that is, in the past 7 days, the actual starting-up time of the user is 10min later than the preset starting-up time on average. Therefore, when the preset starting-up time is estimated next time, the sum of the estimated preset starting-up time and the time correction parameter is calculated to serve as the corrected preset starting-up time, so that the estimation accuracy of the preset starting-up time is improved, the calculation accuracy of the heat storage starting time of the heat storage mode is further improved, the energy waste is reduced, and the user experience is improved. Of course, the time correction parameter in the above example is described as a positive number, and the same holds true for the present control method if the time correction parameter obtained is a negative number. If the time correction parameter is-10 min, the actual starting time of the user in the past 7 days is 10min earlier than the preset starting time on average, and therefore when the preset starting time is estimated next time, the estimation accuracy of the preset starting time can be improved by calculating the sum of the preset starting time and the time correction parameter, namely subtracting 10min from the preset starting time to serve as the corrected preset starting time.
Similarly, when the power-on operation is in the heating mode, a new time correction parameter can be obtained by recording the preset power-on time and the current actual power-on time and combining the data 7 days before the power-on, so that the preset power-on time can be corrected for use next time. That is to say, each time the air conditioner receives a starting instruction to perform heating operation, the time correction parameter is calculated and adjusted based on the acquired current actual starting time and the data in the past set days, and the control method enables the adjusted time correction parameter to better accord with the use habit of the user to the air conditioner in the latest period of time, and ensures the accuracy of the adjusted time correction parameter.
In a more preferred embodiment, before adjusting the time correction parameter, it may be determined that the time correction parameter is not to be adjusted based on a comparison result between a second difference between the current actual startup time of the current startup and the current preset startup time and a preset threshold. Specifically, when a starting-up instruction is received, the current actual starting-up time is recorded; calculating a second difference value between the current actual starting-up time and the current preset starting-up time; judging the size of the second difference value and a preset threshold value; when the second difference is smaller than the preset threshold value, adjusting the time correction parameter; otherwise, the time correction parameter is not adjusted, but the last time correction parameter is used.
For example, the preset threshold may be 20min, when the air conditioner receives a start-up instruction and performs heating operation this time, the current actual start-up time is recorded to be 17:00, the preset start-up time is 18:00, the difference between the two is 60min, and the difference is much larger than the preset threshold of 20min, which indicates that the actual start-up time of the user at this time belongs to a special situation, and the user may return home in advance due to a request for leave or other reasons, so that the current actual start-up time at this time is not suitable for being used as adjustment of the time correction parameter, so as to prevent the situation that the time correction parameter adjusted based on the actual start-up time at this time deviates from the actual habit of the user instead. On the contrary, if the difference between the preset startup time and the current actual startup time is within 20min or further within 10min, it is proved that the data can be used for adjusting the time correction parameter, so as to ensure the adjustment precision of the time correction parameter and avoid the waste of energy during heat storage.
It should be noted that the above preferred embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the setting manner described above, so that the present invention can be applied to more specific application scenarios.
For example, in an alternative embodiment, the timing of determining the time correction parameter may be adjusted as long as the adjusted time satisfies a condition before the preset startup time is corrected this time. For example, the time correction parameter may also be determined before the preset boot time is obtained, and the like.
For another example, in another alternative embodiment, the determination of the time correction parameter is not constant, and the person skilled in the art can adjust the calculation process so that the calculated result can be more accurate. For example, in the calculation process, the historical preset starting-up time and the historical actual starting-up time may be determined in a manner of weighted average or the like instead of calculating the average value of the historical preset starting-up time and the historical pilot starting-up time.
For another example, in another alternative embodiment, the timing of adjusting the time correction parameter may be adjusted after each time the power-on command is received, and the process of determining the magnitude between the second difference and the preset threshold is omitted, and such a process is not deviated from the concept of the present invention.
As another example, in another alternative embodiment, the specific values of the set number of days, the time correction parameter, the preset power-on time, and the actual power-on time are only used as an illustrative example, and are not intended to limit the scope of the present invention, and a person skilled in the art may adjust the values without departing from the principles of the present control method.
Example 3
A third embodiment of the present invention will be described with reference to fig. 4. Fig. 4 is a flowchart illustrating a method for controlling an air conditioner according to a third embodiment of the present invention.
As shown in fig. 4, in one possible embodiment, the method for controlling an air conditioner includes the main steps of:
s301, when the air conditioner is in a stop state, acquiring the outdoor environment temperature; when the air conditioner is in a stop state, the outdoor environment temperature is detected by a temperature sensor arranged on an outdoor unit of the air conditioner.
S302, when the outdoor environment temperature is less than or equal to a first preset environment temperature, acquiring a preset starting time of the air conditioner; for example, the outdoor environment temperature is 0 ℃, the first preset environment temperature is 5 ℃, the heat storage frequency is 40Hz, when the outdoor environment temperature is less than 5 ℃, the waiting time for the air conditioner to operate in the cold air prevention mode is long, and the compressor cannot realize rapid frequency increase through operating at a high frequency, at this time, the preset starting time of the air conditioner is firstly obtained.
S303, determining the heat storage time of the air conditioner based on the outdoor environment temperature; after the preset starting time is obtained, the cloud server calculates the heat storage time matched with the outdoor environment temperature based on the outdoor environment temperature.
S304, calculating the heat storage starting time of the air conditioner based on the preset starting time and the heat storage time; for example, after the preset startup time is obtained and the heat storage time is determined, the heat storage start time is obtained by calculating the difference between the preset startup time and the heat storage time. If the heat storage time is determined to be 5min, and the preset starting time is 18:10, the heat storage starting time is 18: 05.
S305, when the heat accumulation starting time is reached, controlling the compressor to operate at the heat accumulation frequency; if the cloud-end server calculates the heat accumulation starting time, when the time comes to 18:05, the compressor is controlled to operate at a certain frequency lower than the rated working frequency, for example, the heat accumulation frequency is 40Hz, and when the air conditioner operates in the heat accumulation mode, the compressor is controlled to operate at 40 Hz.
S306, controlling the outdoor fan to operate while the compressor starts to operate; for example, the outdoor fan is an ac fan, and the outdoor fan is controlled to start operation while the compressor starts to operate. Of course, the starting time of the outdoor fan may be before or after the compressor starts to operate, as long as the outdoor fan is correspondingly started to operate when the compressor operates.
As can be seen from the above description, based on embodiment 1, when the outdoor ambient temperature is less than or equal to the first preset ambient temperature, the preset startup time is first obtained and the heat storage time of the air conditioner is determined based on the outdoor ambient temperature, so that the heat storage time is corrected based on the outdoor ambient temperature, the accuracy of the heat storage time is further ensured, and the energy is prevented from being wasted.
Since steps S301, S305 to S306 are the same as or similar to the control manner of embodiment 1, the description is omitted here. The following description focuses on steps S302 to S304.
Preferably, the heat accumulation time may be calculated based on a fitting formula between the outdoor ambient temperature and the heat accumulation time. For example, the heat storage time is calculated using the following formula (1):
t＝k×Tao+b (1)
in formula (1), t represents the heat accumulation time, Tao is the outdoor ambient temperature, and k and b are constants that can be fit based on experimental data. For example, the heat accumulation time of the compressor is tested several times for different outdoor ambient temperatures. In multiple experiments, the air conditioner air outlet temperature when the air conditioner enters a normal operation state is set to be the same target temperature, the compressor is enabled to operate at the same heat storage frequency, the heat storage time required by the compressor when the air conditioner air outlet temperature reaches the same target temperature under different outdoor environment temperatures is judged, and therefore the linear relation between the heat storage time of the compressor and the outdoor environment temperature is established.
Of course, the determination of the heat storage time may also be performed based on other relationships between the outdoor ambient temperature and the heat storage time, such as the fixed corresponding relationship between the outdoor ambient temperature and the heat storage time. If a comparison table of the outdoor environment temperature and the heat storage time is determined based on the heat storage test, the comparison table is stored in the air conditioner, and the heat storage time corresponding to the outdoor environment temperature can be determined by using the comparison table.
The setting mode has the advantages that: because different outdoor environment temperatures have great influence on the heat storage capacity of the air conditioner, the heat storage time is determined by utilizing a fitting formula or a corresponding relation between the outdoor environment temperature and the heat storage time, the accuracy of the heat storage time can be further ensured on the basis of ensuring the accuracy of the actual starting time, and the energy is prevented from being excessively wasted.
Example 4
A fourth embodiment of the present invention will be described with reference to fig. 5. Fig. 5 is a flowchart illustrating a method for controlling an air conditioner according to a fourth embodiment of the present invention.
As shown in fig. 5, in one possible embodiment, the control method of the air conditioner includes the main steps of:
s401, when the air conditioner is in a stop state, acquiring outdoor environment temperature; when the air conditioner is in a stop state, the outdoor environment temperature is detected by a temperature sensor arranged on an outdoor unit of the air conditioner.
S402, when the outdoor environment temperature is less than or equal to a first preset environment temperature, acquiring a preset starting time of the air conditioner; for example, the outdoor environment temperature is 0 ℃, the first preset environment temperature is 5 ℃, the heat storage frequency is 40Hz, when the outdoor environment temperature is less than 5 ℃, the waiting time for the air conditioner to operate in the cold air prevention mode is long, and the compressor cannot realize rapid frequency increase through operating at a high frequency, at this time, the preset starting time of the air conditioner is firstly obtained.
S403, correcting the preset starting-up time based on the time correction parameter; after the preset starting time is set by a user or calculated by the air conditioner, the starting time is corrected based on the time correction parameter, and if the preset starting time is corrected by increasing or decreasing a time period on the basis of the determined preset starting time, the corrected preset starting time can be closer to the real starting time of the user. For example, if the preset power-on time is 18:00 and the time correction parameter is +10min, the corrected preset power-on time is 18:00+10min, which is 18: 10.
S404, determining the heat storage time of the air conditioner based on the outdoor environment temperature; for example, after the preset startup time is obtained, the cloud server calculates the heat storage time matched with the outdoor environment temperature based on the outdoor environment temperature.
S405, calculating the heat storage starting time of the air conditioner based on the corrected preset starting time and heat storage time; for example, after the corrected preset startup time and the heat accumulation time are obtained, the heat accumulation start time is obtained by calculating the difference between the preset startup time and the heat accumulation time. If the heat storage time is determined to be 5min, and the preset starting time is 18:10, the heat storage starting time is 18: 05.
S406, when the heat accumulation starting moment is reached, controlling the compressor to operate at the heat accumulation frequency; if the cloud-end server calculates the heat accumulation starting time, when the time comes to 18:05, the compressor is controlled to operate at a certain frequency lower than the rated working frequency, for example, the heat accumulation frequency is 40Hz, and when the air conditioner operates in the heat accumulation mode, the compressor is controlled to operate at 40 Hz.
S407, controlling the outdoor fan to operate while the compressor starts to operate; for example, the outdoor fan is an ac fan, and the outdoor fan is controlled to start operation while the compressor starts to operate. Of course, the starting time of the outdoor fan may be before or after the compressor starts to operate, as long as the outdoor fan is correspondingly started to operate when the compressor operates.
As can be seen from the above description, on the basis of embodiment 1, the preset starting time is corrected based on the time correction parameter when the outdoor environment temperature is less than or equal to the first preset environment temperature, the control method of the present invention can correct the preset starting time based on the starting habit of the user, so that the corrected preset starting time is closer to the real starting time of the user, and the air conditioner is charged based on the corrected preset starting time, thereby avoiding energy waste caused by insufficient or overlong charging time, achieving precise and personalized treatment for a single user, and improving user experience. Meanwhile, the heat storage time of the air conditioner is determined based on the outdoor environment temperature when the outdoor environment temperature is less than or equal to the first preset environment temperature, so that the heat storage time is corrected based on the outdoor environment temperature, the accuracy of the heat storage time is further ensured, and the energy is prevented from being wasted.
Since the implementation steps in this embodiment have been described in detail in embodiments 1 to 3, detailed description is omitted in this embodiment.
Those skilled in the art will appreciate that the air conditioner described above may also include other known structures such as processors, controllers, memories, etc., wherein the memories include, but are not limited to, ram, flash, rom, prom, volatile, non-volatile, serial, parallel, or registers, etc., and the processors include, but are not limited to, CPLD/FPGA, DSP, ARM processor, MIPS processor, etc. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (6)
1. A control method of an air conditioner including a compressor, a throttling element, an outdoor heat exchanger and an outdoor fan, and an indoor heat exchanger and an indoor fan, the control method comprising:
when the air conditioner is in a shutdown state, acquiring the outdoor environment temperature;
judging the outdoor environment temperature and a first preset environment temperature;
when the outdoor environment temperature is less than or equal to a first preset environment temperature, controlling the compressor to operate at a heat storage frequency;
controlling the outdoor fan to operate while, before, or after the compressor starts to operate;
the control method further comprises the following steps:
when the outdoor environment temperature is higher than the first preset environment temperature, controlling the air conditioner to keep a shutdown state;
after the step of "controlling the air conditioner to maintain the stopped state", the control method further includes:
when a starting-up instruction is received, acquiring the outdoor environment temperature;
judging the outdoor environment temperature and a second preset environment temperature;
controlling the compressor to increase frequency in stages based on the judgment result;
wherein the second preset ambient temperature is greater than the first preset ambient temperature;
the step of controlling the compressor to step up in stages based on the determination result further includes:
when the outdoor environment temperature is greater than the second preset environment temperature, determining a second starting frequency and a second frequency increasing speed of the compressor based on the outdoor environment temperature;
controlling the compressor to increase the frequency from the second starting frequency to a first oil return frequency at the second increasing frequency speed;
when the compressor is raised to the first oil return frequency, controlling the compressor to operate for a first oil return time at the first oil return frequency;
when the compressor runs at the first oil return frequency for the first oil return time, controlling the compressor to increase the frequency to a target frequency at the second frequency increasing speed;
the step of controlling the compressor to step up in stages based on the determination result further includes:
determining a third starting frequency and a third frequency increasing speed of the compressor based on the outdoor environment temperature when the outdoor environment temperature is less than or equal to the second preset environment temperature and greater than the first preset environment temperature;
controlling the compressor to ramp up from the third start-up frequency to the first oil return frequency at the third ramp-up speed;
when the compressor is up-converted to the first oil return frequency, controlling the compressor to run at the first oil return frequency for a second oil return time;
when the compressor runs at the first oil return frequency for the second oil return time, controlling the compressor to increase the frequency to a second oil return frequency at the third frequency increasing speed;
when the compressor is raised to the second oil return frequency, controlling the compressor to run for a third oil return time at the second oil return frequency;
controlling the compressor to frequency up to a target frequency at the third frequency up-conversion speed when the compressor operates at the second oil return frequency for the third oil return time;
the second oil return time and the third oil return time are both greater than the first oil return time, the second starting frequency is greater than the third starting frequency, and the second frequency-increasing speed is greater than the third frequency-increasing speed.
2. The control method of an air conditioner according to claim 1, wherein the step of controlling the compressor to operate at the heat storage frequency when the outdoor ambient temperature is less than or equal to a first preset ambient temperature further comprises:
when the outdoor environment temperature is less than or equal to the first preset environment temperature, determining a first starting frequency and a first frequency increasing speed of the compressor based on the outdoor environment temperature;
controlling the compressor to increase the frequency from the first starting frequency to the heat storage frequency at the first increasing frequency speed.
3. The control method of an air conditioner according to claim 1, further comprising:
detecting the coil temperature of the indoor heat exchanger during the operation of the compressor at the heat accumulation frequency;
judging the sizes of the coil temperature and a first preset coil temperature;
selectively controlling the compressor and the outdoor fan to stop operating based on the determination result.
4. The control method of an air conditioner according to claim 3, wherein the step of selectively controlling the compressor and the outdoor fan to stop operating based on the determination result further comprises:
and when the temperature of the coil pipe is greater than the first preset temperature of the coil pipe, controlling the compressor and the outdoor fan to stop running.
5. The control method of an air conditioner according to claim 4, wherein after the step of 'controlling the compressor and the outdoor fan to stop operating', the control method further comprises:
detecting the temperature of the coil;
judging the temperature of the coil and the temperature of a second preset coil;
selectively controlling the compressor and the outdoor fan to be turned on based on the comparison result;
wherein the first preset coil temperature is greater than the second preset coil temperature.
6. The control method of an air conditioner according to claim 5, wherein the step of selectively controlling the compressor and the outdoor fan to be turned on based on the comparison result further comprises:
and when the coil temperature is less than or equal to the second preset coil temperature, controlling the compressor to operate at the heat storage frequency and controlling the outdoor fan to be started.
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