CN107543288B - Air conditioning system, and control method and device of air conditioning system - Google Patents
Air conditioning system, and control method and device of air conditioning system Download PDFInfo
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- CN107543288B CN107543288B CN201710744828.1A CN201710744828A CN107543288B CN 107543288 B CN107543288 B CN 107543288B CN 201710744828 A CN201710744828 A CN 201710744828A CN 107543288 B CN107543288 B CN 107543288B
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Abstract
The invention discloses an air conditioning system, and a control method and a control device of the air conditioning system, wherein the method comprises the steps of acquiring the temperature of an outdoor heat exchanger of the air conditioning system when the air conditioning system is controlled to operate in a heating mode; when the temperature of the outdoor heat exchanger is less than or equal to zero, acquiring the temperature of the indoor heat exchanger and the return air temperature of the indoor unit, and acquiring the temperature difference between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit; judging whether the temperature of the indoor heat exchanger is greater than or equal to a first preset temperature and whether the temperature difference is greater than or equal to a second preset temperature; and if the temperature of the indoor heat exchanger is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature, controlling the air conditioning system to enter a frequency reduction control mode. From this, can guarantee air conditioning system's the prerequisite of sending back the wind difference in temperature and ensuring user's travelling comfort under, the extension period of defrosting guarantees the stationarity of air supply temperature, improves the efficiency of system, reduces the energy consumption of system, realizes energy-saving control, promotes user's experience.
Description
Technical Field
The present invention relates to the field of air conditioner technology, and in particular, to a control method for an air conditioning system, a non-transitory computer-readable storage medium, a control device for an air conditioning system, and an air conditioning system.
Background
In the related art, the variable frequency multi-split air conditioning system is widely used in a heating process in a lower temperature environment. However, the related art has problems that the outdoor heat exchanger is easily frosted during the heating process of the air conditioning system, frequent defrosting is required, the heating efficiency of the air conditioner is reduced, and the energy consumption is increased.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a control method for an air conditioning system, which can ensure the comfort of the air conditioning system and reduce the energy consumption.
A second object of the invention is to propose a non-transitory computer-readable storage medium.
The third purpose of the invention is to provide a control device of an air conditioning system.
The fourth purpose of the invention is to provide an air conditioning system.
In order to achieve the above object, a first embodiment of the present invention provides a control method for an air conditioning system, including the following steps: when the air-conditioning system is controlled to operate in a heating mode, acquiring the temperature of an outdoor heat exchanger of the air-conditioning system; when the temperature of the outdoor heat exchanger is less than or equal to zero, acquiring the temperature of an indoor heat exchanger and the return air temperature of an indoor unit, and acquiring the temperature difference between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit; judging whether the temperature of the indoor heat exchanger is greater than or equal to a first preset temperature and whether the temperature difference is greater than or equal to a second preset temperature; and if the temperature of the indoor heat exchanger is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature, controlling the air conditioning system to enter a frequency reduction control mode.
According to the control method of the air conditioning system provided by the embodiment of the invention, when the air conditioning system heats, the temperature of an outdoor heat exchanger of the air conditioning system is obtained, when the temperature of the outdoor heat exchanger is less than or equal to zero, the temperature of an indoor heat exchanger and the return air temperature of an indoor unit are obtained, the temperature difference between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit is obtained, then whether the temperature of the indoor heat exchanger is greater than or equal to a first preset temperature and whether the temperature difference is greater than or equal to a second preset temperature is judged, and if the temperature of the indoor heat exchanger is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature, the air conditioning system is controlled to. Therefore, the control method provided by the embodiment of the invention can prolong the defrosting period, ensure the stability of the air supply temperature, improve the energy efficiency of the system, reduce the energy consumption of the system, realize energy-saving control and improve the user experience by performing frequency reduction control on the air conditioning system on the premise of ensuring the temperature difference of the returned air of the air conditioning system and ensuring the comfort of the user.
According to an embodiment of the present invention, after controlling the air conditioning system to enter the down-conversion control mode, the method may further include: controlling the running frequency of a compressor of the air conditioning system to reduce a preset frequency, and judging whether the temperature of the indoor heat exchanger and the temperature difference meet exit conditions at intervals of a preset time; and if the temperature of the indoor heat exchanger and the temperature difference meet the exit condition, controlling the air conditioning system to exit the frequency reduction control mode.
According to an embodiment of the present invention, if the temperature of the indoor heat exchanger and the temperature difference do not satisfy the exit condition, it is determined whether the temperature of the outdoor heat exchanger is less than or equal to zero; if the temperature of the outdoor heat exchanger is less than or equal to zero, controlling the running frequency of the compressor to continuously reduce the preset frequency; and if the temperature of the outdoor heat exchanger is greater than zero, controlling the running frequency of the compressor to be kept unchanged.
According to an embodiment of the invention, the exit condition may comprise: the temperature of the indoor heat exchanger is smaller than the difference between the first preset temperature and the first preset threshold or the temperature difference is smaller than the difference between the second preset temperature and the second preset threshold, wherein the first preset threshold and the second preset threshold are both larger than zero.
According to an embodiment of the present invention, the first preset temperature may be 38 ℃, the second preset temperature may be 15 ℃, and both the first preset threshold and the second preset threshold may be 2 ℃.
To achieve the above object, a second embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program implementing the control method of the air conditioning system when executed by a processor.
According to the non-transitory computer-readable storage medium provided by the embodiment of the invention, by executing the control method of the air conditioning system, the defrosting cycle can be prolonged, the stability of the air supply temperature can be ensured, the energy efficiency of the system can be improved, the energy consumption of the system can be reduced, the energy-saving control can be realized, and the user experience can be improved on the premise of ensuring the return air temperature difference of the air conditioning system and the comfort of the user. In order to achieve the above object, a third aspect of the present invention provides a control device for an air conditioning system, including: the first temperature detection unit is arranged on an outdoor heat exchanger of the air conditioning system and used for detecting the temperature of the outdoor heat exchanger; the second temperature detection unit is arranged on an indoor heat exchanger of the air conditioning system and used for detecting the temperature of the indoor heat exchanger; the third temperature detection unit is arranged at a return air inlet of an indoor unit of the air conditioning system and is used for detecting the return air temperature of the indoor unit; the control unit, the control unit respectively with first temperature detect unit the second temperature detect unit with the third temperature detect unit links to each other, the control unit is used for controlling air conditioning system is in order to heat the mode operation, and is in outdoor heat exchanger's temperature is less than or equal to zero hour, acquires indoor heat exchanger's temperature with the temperature difference between the return air temperature of indoor set, and judge whether indoor heat exchanger's temperature is greater than or equal to first preset temperature just whether the temperature difference is greater than or equal to the second preset temperature, and indoor heat exchanger's temperature is greater than or equal to first preset temperature just when the temperature difference is greater than or equal to the second preset temperature, control air conditioning system gets into the mode of controlling that falls.
According to the control device of the air conditioning system provided by the embodiment of the invention, when the air conditioning system is controlled to operate in the heating mode, the control unit detects the temperature of the outdoor heat exchanger through the first temperature detection unit, detects the temperature of the indoor heat exchanger through the second temperature detection unit and detects the return air temperature of the indoor unit through the third temperature detection unit, obtains the temperature difference between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit when the temperature of the outdoor heat exchanger is less than or equal to zero, judges whether the temperature of the indoor heat exchanger is greater than or equal to a first preset temperature and whether the temperature difference is greater than or equal to a second preset temperature, and controls the air conditioning system to enter the frequency reduction mode when the temperature of the indoor heat exchanger is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the. Therefore, the control device provided by the embodiment of the invention can prolong the defrosting period, ensure the stability of the air supply temperature, improve the energy efficiency of the system, reduce the energy consumption of the system, realize energy-saving control and improve the user experience by performing frequency reduction control on the air conditioning system on the premise of ensuring the temperature difference of the returned air of the air conditioning system and ensuring the comfort of the user. According to an embodiment of the present invention, after controlling the air conditioning system to enter the frequency-reduction control mode, the control unit may be further configured to control an operating frequency of a compressor of the air conditioning system to decrease a preset frequency, and determine whether the temperature of the indoor heat exchanger and the temperature difference satisfy an exit condition every preset time, and control the air conditioning system to exit the frequency-reduction control mode when the temperature of the indoor heat exchanger and the temperature difference satisfy the exit condition.
According to an embodiment of the present invention, the control unit may be further configured to determine whether the temperature of the outdoor heat exchanger is less than or equal to zero when the temperature of the indoor heat exchanger and the temperature difference do not satisfy the exit condition, control the operating frequency of the compressor to continue to decrease the preset frequency when the temperature of the outdoor heat exchanger is less than or equal to zero, and control the operating frequency of the compressor to remain unchanged when the temperature of the outdoor heat exchanger is greater than zero.
According to an embodiment of the invention, the exit condition may comprise: the temperature of the indoor heat exchanger is smaller than the difference between the first preset temperature and the first preset threshold or the temperature difference is smaller than the difference between the second preset temperature and the second preset threshold, wherein the first preset threshold and the second preset threshold are both larger than zero.
According to an embodiment of the present invention, the first preset temperature may be 38 ℃, the second preset temperature may be 15 ℃, and both the first preset threshold and the second preset threshold may be 2 ℃.
In order to achieve the above object, a fourth aspect of the present invention provides an air conditioning system, including the control device of the air conditioning system.
According to the air conditioning system provided by the embodiment of the invention, through the control device of the air conditioning system, the defrosting period can be prolonged, the stability of the air supply temperature can be ensured, the energy efficiency of the system can be improved, the energy consumption of the system can be reduced, the energy-saving control can be realized, and the user experience can be improved on the premise of ensuring the air return temperature difference of the air conditioning system and the comfort of a user.
Drawings
Fig. 1 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an air conditioning system according to one embodiment of the present invention;
fig. 3 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of an air conditioning system according to another embodiment of the present invention;
FIG. 5 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention;
FIG. 6 is a block schematic diagram of a control device of an air conditioning system according to an embodiment of the present invention; and
fig. 7 is a block schematic diagram of an air conditioning system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control method of an air conditioning system, a control device of an air conditioning system, and an air conditioning system according to an embodiment of the present invention are described below with reference to the drawings.
Fig. 1 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention. The air conditioning system comprises an outdoor unit and a plurality of indoor units, wherein the outdoor unit comprises a plurality of frequency conversion compressors connected in parallel, and the air conditioning system can be a frequency conversion multi-split air conditioning system. For example, as shown in fig. 2, the outdoor unit includes two inverter compressors (i.e., a first inverter compressor and a second inverter compressor), and specifically, the plurality of compressors may be connected in parallel, exhaust ports of the plurality of compressors are connected to a first end of a four-way valve, a second end of the four-way valve is sequentially connected to an outdoor heat exchanger, an outdoor throttling part and a high pressure stop valve, the high pressure stop valve is further connected to a first end of an indoor heat exchanger, return ports of the plurality of compressors are connected to a first end of a low pressure tank, the other end of the low pressure tank is connected to a third end of the four-way valve, a fourth end of the four-way valve is connected to one end of a low pressure stop valve, and the.
As shown in fig. 1, the control method of the air conditioning system according to the embodiment of the present invention includes the steps of:
s1: when the air conditioning system is controlled to operate in the heating mode, the temperature of an outdoor heat exchanger of the air conditioning system is acquired.
According to an embodiment of the present invention, the temperature of the outdoor heat exchanger may be detected by the first temperature detecting unit, and particularly, the first temperature detecting unit may be disposed inside or outside the outdoor heat exchanger.
S2: when the temperature of the outdoor heat exchanger is less than or equal to zero, the temperature of the indoor heat exchanger and the return air temperature of the indoor unit are obtained, and the temperature difference between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit is obtained.
According to an embodiment of the present invention, the temperature of the indoor heat exchanger may be detected by the second temperature detecting unit, and the return air temperature of the indoor unit may be detected by the third temperature detecting unit, and particularly, the second temperature detecting unit may be disposed inside or outside the indoor heat exchanger, and the third temperature detecting unit may be disposed at the return air inlet of the indoor unit. The temperature Tb of the indoor heat exchanger detected by the second temperature detection unit can be subtracted by the return air temperature Tc of the indoor unit detected by the third temperature detection unit to obtain the temperature difference Tb-Tc between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit.
S3: and judging whether the temperature of the indoor heat exchanger is greater than or equal to a first preset temperature and whether the temperature difference is greater than or equal to a second preset temperature.
S4: and if the temperature of the indoor heat exchanger is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature, controlling the air conditioning system to enter a frequency reduction control mode.
It should be noted that, in the process of heating by the heat pump with the ambient temperature of 0-7 ℃, the temperature Ta of the outdoor heat exchanger is higher than 0 ℃ and less than or equal to 0 ℃, when the temperature Ta of the outdoor heat exchanger is less than or equal to 0 ℃, that is, Ta is less than or equal to 0 ℃, the frosting of the outdoor heat exchanger occurs after the air-conditioning system operates for a period of time, the frosting can seriously reduce the heating capacity of the air-conditioning system, even cause the discontinuous heat supply and reduce the comfort of users; when the temperature Ta of the outdoor heat exchanger is higher than 0 ℃, namely Ta is higher than 0 ℃, the air conditioning system can stably run for a long time without defrosting, but the frequency of the compressor needs to be properly reduced under the condition of maximizing the outdoor heat exchange capacity, namely the air supply temperature of the indoor unit is properly reduced.
Based on this, in the embodiment of the present invention, after the air conditioning system is powered on, when the air conditioning system is controlled to operate in the heating mode, the temperature of the outdoor heat exchanger of the air conditioning system is obtained, when the temperature of the outdoor heat exchanger is less than or equal to zero, the temperature of the indoor heat exchanger and the return air temperature of the indoor unit are obtained, the temperature difference between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit is obtained, and then it is determined whether the temperature of the indoor heat exchanger is greater than or equal to a first preset temperature and whether the temperature difference is greater than or equal to a second preset temperature; if the temperature of the indoor heat exchanger is greater than or equal to a first preset temperature and the temperature difference is greater than or equal to a second preset temperature, the air conditioning system is controlled to enter a frequency reduction control mode, and if the temperature of the indoor heat exchanger is less than the first preset temperature or the temperature difference is less than the second preset temperature, the heating mode is continued, and the temperature of the indoor heat exchanger and the return air temperature and the temperature difference of the indoor unit are continuously obtained.
Therefore, the control method provided by the embodiment of the invention can prolong the defrosting period, ensure the stability of the air supply temperature, improve the energy efficiency of the system, reduce the energy consumption of the system, realize energy-saving control and improve the user experience by performing frequency reduction control on the air conditioning system on the premise of ensuring the temperature difference of the returned air of the air conditioning system and ensuring the comfort of the user.
According to an embodiment of the present invention, as shown in fig. 3, after controlling the air conditioning system to enter the down-conversion control mode, the method may further include:
s101: and controlling the running frequency of a compressor of the air conditioning system to reduce a preset frequency, and judging whether the temperature and the temperature difference of the indoor heat exchanger meet exit conditions at preset time intervals.
S102: and if the temperature and the temperature difference of the indoor heat exchanger meet exit conditions, controlling the air conditioning system to exit the frequency reduction control mode.
Further, as shown in fig. 4, the control method of the air conditioning system according to the embodiment of the present invention further includes:
s201: and if the temperature of the indoor heat exchanger and the temperature difference do not meet the exit condition, judging whether the temperature of the outdoor heat exchanger is less than or equal to zero or not.
S202: and if the temperature of the outdoor heat exchanger is less than or equal to zero, controlling the running frequency of the compressor to continuously reduce the preset frequency.
S203: and if the temperature of the outdoor heat exchanger is greater than zero, controlling the running frequency of the compressor to be kept unchanged.
Specifically, after the air conditioning system is controlled to enter the frequency reduction control mode, the operating frequency of a compressor of the air conditioning system can be controlled to reduce a preset frequency, wherein the preset frequency delta F can be 8Hz, then the preset time delta T is set every other preset time delta T, wherein the preset time delta T can be 3 minutes, the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger are obtained, whether the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger meet exit conditions or not is judged, and if the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger meet the exit conditions, the air conditioning system is controlled to exit the frequency reduction control mode; if the temperature Tb of the indoor heat exchanger and the temperature difference Tb-Tc do not meet the exit condition, judging whether the temperature Ta of the outdoor heat exchanger is less than or equal to zero or not; if the temperature Ta of the outdoor heat exchanger is less than or equal to zero, controlling the running frequency of the compressor to continuously reduce the preset frequency; and if the temperature Ta of the outdoor heat exchanger is greater than zero, controlling the running frequency of the compressor to be kept unchanged.
That is, after the operation frequency of the compressor of the air conditioning system is controlled to be reduced by the preset frequency, whether the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger meet the quitting condition or not is judged, if the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger meet the quitting condition, the air conditioning system after frequency reduction cannot meet the comfort requirement of a user, and the air conditioning system is controlled to quit the frequency reduction control mode; if the temperature Tb of the indoor heat exchanger and the temperature difference Tb-Tc do not meet the exit condition, judging whether the temperature Ta of the outdoor heat exchanger is less than or equal to zero or not, if the temperature Ta of the outdoor heat exchanger is less than or equal to zero, indicating that the air-conditioning system is still easy to frost, and controlling the running frequency of the compressor to continuously reduce the preset frequency; if the temperature Ta of the outdoor heat exchanger is larger than zero, the air-conditioning system can stably operate without defrosting, and the operation frequency of the compressor is controlled to be kept unchanged.
According to one embodiment of the invention, the exit condition comprises: the temperature of the indoor heat exchanger is smaller than the difference between a first preset temperature and a first preset threshold or the temperature difference is smaller than the difference between a second preset temperature and a second preset threshold, wherein the first preset threshold and the second preset threshold are both larger than zero.
Specifically, the first preset temperature may be 38 ℃, the second preset temperature may be 15 ℃, and both the first preset threshold and the second preset threshold may be 2 ℃.
That is, the conditions for determining whether the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger satisfy the exit condition include: the temperature Tb of the indoor heat exchanger is less than the difference between the first preset temperature and the first preset threshold value, such as Tb < 36 ℃, or the temperature difference Tb-Tc is less than the difference between the second preset temperature and the second preset threshold value, such as Tb-Tc < 13 ℃.
Specifically, when Tb is less than 36 ℃ or Tb-Tc is less than 13 ℃, judging that the quit condition is met and controlling the air conditioning system to quit the frequency reduction control mode; otherwise, judging that the exit condition is not met, judging whether the temperature Ta of the outdoor heat exchanger is less than or equal to zero or not, and controlling the running frequency of the compressor to continuously reduce the preset frequency if the temperature Ta of the outdoor heat exchanger is less than 0 ℃; and if the temperature Ta of the outdoor heat exchanger is more than 0 ℃, controlling the running frequency of the compressor to be kept unchanged.
According to an embodiment of the present invention, as shown in fig. 5, a control method of an air conditioning system according to an embodiment of the present invention includes the steps of:
s301: and powering on the air conditioning system to start.
S302: and entering a normal heating mode.
S303: judging whether the following conditions are met simultaneously:
① whether the temperature Ta of the outdoor heat exchanger is less than or equal to zero;
② whether the temperature Tb of the indoor heat exchanger is greater than or equal to 38 ℃;
③ temperature difference Tb-Tc is greater than or equal to 15 ℃.
If the above three conditions are satisfied simultaneously, executing step S304; if the above three conditions are not satisfied simultaneously, the process returns to step S303.
S304: the frequency of the compressor is controlled to be lowered by a preset frequency deltaf, for example 8 Hz.
S305: after the preset time interval, judging whether the temperature Tb of the indoor heat exchanger is less than 36 ℃ or the temperature difference Tb-Tc is less than 13 ℃.
If yes, namely the temperature Tb of the indoor heat exchanger is less than 36 ℃ or the temperature difference Tb-Tc is less than 13 ℃, the step S302 is returned to; if not, i.e., the temperature Tb of the indoor heat exchanger is greater than or equal to 36 deg.c and the temperature difference Tb-Tc is greater than or equal to 13 deg.c, step S306 is performed.
S306: and judging whether the temperature Ta of the outdoor heat exchanger is less than or equal to zero.
If yes, returning to the step S304; if not, step S307 is executed.
S307: the current compressor frequency operation is maintained and returns to step S303.
In summary, according to the control method of the air conditioning system provided in the embodiment of the present invention, when the air conditioning system performs heating, the temperature of the outdoor heat exchanger of the air conditioning system is obtained, when the temperature of the outdoor heat exchanger is less than or equal to zero, the temperature of the indoor heat exchanger and the return air temperature of the indoor unit are obtained, a temperature difference between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit is obtained, then it is determined whether the temperature of the indoor heat exchanger is greater than or equal to a first preset temperature and the temperature difference is greater than or equal to a second preset temperature, and if the temperature of the indoor heat exchanger is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature, the air conditioning system is. Therefore, the control method provided by the embodiment of the invention can prolong the defrosting period, ensure the stability of the air supply temperature, improve the energy efficiency of the system, reduce the energy consumption of the system, realize energy-saving control and improve the user experience by performing frequency reduction control on the air conditioning system on the premise of ensuring the temperature difference of the returned air of the air conditioning system and ensuring the comfort of the user.
Embodiments of the present invention further provide a non-transitory computer-readable storage medium, which when being executed by a processor, is capable of executing the control method of the air conditioning system according to the above embodiments of the present invention.
According to the non-transitory computer-readable storage medium provided by the embodiment of the invention, by executing the control method of the air conditioning system, the defrosting cycle can be prolonged, the stability of the air supply temperature can be ensured, the energy efficiency of the system can be improved, the energy consumption of the system can be reduced, the energy-saving control can be realized, and the user experience can be improved on the premise of ensuring the return air temperature difference of the air conditioning system and the comfort of the user.
Fig. 6 is a block schematic diagram of a control device of an air conditioning system according to an embodiment of the present invention. The air conditioning system comprises an outdoor unit and a plurality of indoor units, wherein the outdoor unit comprises a plurality of frequency conversion compressors connected in parallel, and the air conditioning system can be a frequency conversion multi-split air conditioning system. For example, as shown in fig. 2, the outdoor unit 100 includes two inverter compressors (i.e., a first inverter compressor 2 and a second inverter compressor 3), and specifically, the plurality of compressors may be connected in parallel, exhaust ports of the plurality of compressors are connected to a first end D of a four-way valve 4, a second end C of the four-way valve 4 is connected to an outdoor heat exchanger 5, an outdoor throttling member 6, and a high-pressure cutoff valve 7 in sequence, the high-pressure cutoff valve 7 is further connected to a first end of an indoor heat exchanger 9, return ports of the plurality of compressors are connected to a first end of a low-pressure tank 1, the other end of the low-pressure tank 1 is connected to a third end S of the four-way valve 4, a fourth end E of the four-way valve 4 is connected to one end of the low-pressure cutoff.
As shown in fig. 6, the control device of an air conditioning system according to an embodiment of the present invention includes: a first temperature detecting unit 10, a second temperature detecting unit 20, a third temperature detecting unit 30, and a control unit 40.
Wherein, the first temperature detecting unit 10 is arranged on the outdoor heat exchanger 5 of the air conditioning system for detecting the temperature of the outdoor heat exchanger 5, the second temperature detecting unit 20 is arranged on the indoor heat exchanger 9 of the air conditioning system for detecting the temperature of the indoor heat exchanger 9, the third temperature detecting unit 30 is arranged on the return air inlet of the indoor unit 200 of the air conditioning system for detecting the return air temperature of the indoor unit 200, the control unit 40 is respectively connected with the first temperature detecting unit 10, the second temperature detecting unit 20 and the third temperature detecting unit 30, the control unit 40 is used for controlling the air conditioning system to operate in a heating mode, and when the temperature of the outdoor heat exchanger 5 is less than or equal to zero, the temperature difference between the temperature of the indoor heat exchanger 9 and the return air temperature of the indoor unit 200 is obtained, and whether the temperature of the indoor heat exchanger 9 is greater than or equal to the first preset temperature and whether the temperature difference is greater than or, and controlling the air conditioning system to enter a frequency reduction control mode when the temperature of the indoor heat exchanger 9 is greater than or equal to a first preset temperature and the temperature difference is greater than or equal to a second preset temperature.
According to an embodiment of the present invention, the first temperature sensing unit 10 may be disposed inside or outside the outdoor heat exchanger 5, the second temperature sensing unit 20 may be disposed inside or outside the indoor heat exchanger 9, and the third temperature sensing unit 30 may be disposed at a return air inlet of the indoor unit 200. The return air temperature Tc of the indoor unit detected by the third temperature detection unit 30 can be subtracted from the temperature Tb of the indoor heat exchanger 9 detected by the second temperature detection unit 20 to obtain the temperature difference Tb-Tc between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit.
It should be noted that, in the process of heating by the heat pump with the ambient temperature of 0-7 ℃, the temperature Ta of the outdoor heat exchanger is higher than 0 ℃ and less than or equal to 0 ℃, when the temperature Ta of the outdoor heat exchanger is higher than 0 ℃, namely, Ta is greater than 0 ℃, the air conditioning system can stably run for a long time without defrosting, but the frequency of the compressor needs to be properly reduced under the condition of maximizing the outdoor heat exchange capacity, namely, the air supply temperature of the indoor unit is properly reduced; when the temperature Ta of the outdoor heat exchanger is less than or equal to 0 ℃, namely Ta is less than or equal to 0 ℃, the frosting of the outdoor heat exchanger can occur after the air-conditioning system operates for a period of time, the frosting can seriously reduce the heating capacity of the air-conditioning system, and even causes discontinuous heat supply to reduce the comfort of users.
Based on this, in the embodiment of the present invention, after the air conditioning system is powered on and started up, the control unit 40 controls the air conditioning system to operate in the heating mode, and when the temperature of the outdoor heat exchanger 5 is less than or equal to zero, obtains the temperature difference between the temperature of the indoor heat exchanger 9 and the return air temperature of the indoor unit 200, and determines whether the temperature of the indoor heat exchanger 9 is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature, and when the temperature of the indoor heat exchanger 9 is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature, the control unit 40 controls the air conditioning system to enter the frequency reduction control mode.
According to an embodiment of the present invention, after controlling the air conditioning system to enter the down-conversion control mode, the control unit 40 is further configured to control the operating frequency of the compressor of the air conditioning system to decrease a preset frequency, and to determine whether the temperature and the temperature difference of the indoor heat exchanger 9 satisfy the exit condition every preset time, and to control the air conditioning system to exit the down-conversion control mode when the temperature and the temperature difference of the indoor heat exchanger 9 satisfy the exit condition.
Further, the control unit 40 is further configured to determine whether the temperature Tb of the outdoor heat exchanger 5 is less than or equal to zero when the temperature Tb of the indoor heat exchanger 9 and the temperature difference Tb-Tc do not satisfy the exit condition, and control the operating frequency of the compressor to continue to decrease by the preset frequency when the temperature Tb of the outdoor heat exchanger 5 is less than or equal to zero, and control the operating frequency of the compressor to remain unchanged when the temperature Tb of the outdoor heat exchanger 5 is greater than zero.
Specifically, after controlling the air conditioning system to enter the frequency reduction control mode, the control unit 40 may first control the operating frequency of the compressor of the air conditioning system to decrease a preset frequency, where the preset frequency Δ F may be 8Hz, then obtain the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger 9 every preset time Δ T (the preset time Δ T may be 3 minutes), the control unit 40 determines whether the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger 9 satisfy an exit condition, and if the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger 9 satisfy the exit condition, the control unit 40 controls the air conditioning system to exit the frequency reduction control mode; if the temperature Tb of the indoor heat exchanger 9 and the temperature difference Tb-Tc do not satisfy the exit condition, the control unit 40 determines whether the temperature Ta of the outdoor heat exchanger 5 is less than or equal to zero; if the temperature Ta of the outdoor heat exchanger 5 is less than or equal to zero, the control unit 40 controls the operating frequency of the compressor to continue to decrease the preset frequency; if the temperature Ta of the outdoor heat exchanger 5 is greater than zero, the control unit 40 controls the operating frequency of the compressor to remain unchanged.
That is, after the operation frequency of the compressor of the air conditioning system is controlled to be reduced by the preset frequency, whether the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger meet the quitting condition or not is judged, and if the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger 9 meet the quitting condition, the air conditioning system after frequency reduction cannot meet the comfort requirement of a user, and the air conditioning system is controlled to quit the frequency reduction control mode; if the temperature Tb of the indoor heat exchanger 9 and the temperature difference Tb-Tc do not meet the exit condition, judging whether the temperature Ta of the outdoor heat exchanger 5 is less than or equal to zero or not, if the temperature Ta of the outdoor heat exchanger 5 is less than or equal to zero, indicating that the air-conditioning system is still easy to frost, and controlling the running frequency of the compressor to continuously reduce the preset frequency; and if the temperature Ta of the outdoor heat exchanger 5 is greater than zero, which indicates that the air conditioning system reaches a stable operation state, controlling the operation frequency of the compressor to be kept unchanged.
According to one embodiment of the invention, the exit condition comprises: the temperature of the indoor heat exchanger 9 is smaller than the difference between a first preset temperature and a first preset threshold or the temperature difference is smaller than the difference between a second preset temperature and a second preset threshold, wherein both the first preset threshold and the second preset threshold are larger than zero. Specifically, the first preset temperature may be 38 ℃, the second preset temperature may be 15 ℃, and both the first preset threshold and the second preset threshold may be 2 ℃.
That is, the condition under which the control unit 40 determines whether the temperature Tb and the temperature difference Tb-Tc of the indoor heat exchanger 9 satisfy the exit condition includes: the temperature Tb of the indoor heat exchanger 9 is less than the difference between the first preset temperature and the first preset threshold value, such as Tb < 36 ℃, or the temperature Tb-Tc is less than the difference between the second preset temperature and the second preset threshold value, such as Tb-Tc < 13 ℃.
Specifically, when Tb is less than 36 ℃ or Tb-Tc is less than 13 ℃, the control unit 40 determines that the quit condition is satisfied and controls the air conditioning system to quit the frequency reduction control mode; otherwise, the control unit 40 determines that the exit condition is not satisfied, at this time, the control unit 40 determines whether the temperature Ta of the outdoor heat exchanger 5 is less than or equal to zero, and if the temperature Ta of the outdoor heat exchanger 5 is less than 0 ℃, the control unit 40 controls the operating frequency of the compressor to continue to decrease the preset frequency; and if the temperature Ta of the outdoor heat exchanger 5 is more than 0 ℃, controlling the running frequency of the compressor to be kept unchanged.
In summary, according to the control device of the air conditioning system provided in the embodiment of the present invention, when the control unit controls the air conditioning system to operate in the heating mode, the first temperature detecting unit detects the temperature of the outdoor heat exchanger, the second temperature detecting unit detects the temperature of the indoor heat exchanger, and the third temperature detecting unit detects the return air temperature of the indoor unit, and when the temperature of the outdoor heat exchanger is less than or equal to zero, the temperature difference between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit is obtained, and whether the temperature of the indoor heat exchanger is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature is determined, and when the temperature of the indoor heat exchanger is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature, the control device of the embodiment of the present invention can control the air conditioning system to enter the frequency reduction mode, under the prerequisite of guaranteeing user's travelling comfort, through control of falling the frequency to air conditioning system, prolonged the period of defrosting, guaranteed the stationarity of air supply temperature, improved the efficiency of system simultaneously, reduced the energy consumption of system, realized energy-saving control, promote user's experience.
The embodiment of the invention also provides an air conditioning system.
Fig. 7 is a block schematic diagram of an air conditioning system according to an embodiment of the present invention. As shown in fig. 7, the air conditioning system 400 includes the control device 300 of the air conditioning system described above.
According to the air conditioning system provided by the embodiment of the invention, through the control device of the air conditioning system, the defrosting period can be prolonged, the stability of the air supply temperature can be ensured, the energy efficiency of the system can be improved, the energy consumption of the system can be reduced, the energy-saving control can be realized, and the user experience can be improved on the premise of ensuring the air return temperature difference of the air conditioning system and the comfort of a user.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. A control method of an air conditioning system is characterized by comprising the following steps:
when the air-conditioning system is controlled to operate in a heating mode, acquiring the temperature of an outdoor heat exchanger of the air-conditioning system;
when the temperature of the outdoor heat exchanger is less than or equal to zero, acquiring the temperature of an indoor heat exchanger and the return air temperature of an indoor unit, and acquiring the temperature difference between the temperature of the indoor heat exchanger and the return air temperature of the indoor unit;
judging whether the temperature of the indoor heat exchanger is greater than or equal to a first preset temperature and whether the temperature difference is greater than or equal to a second preset temperature;
and if the temperature of the indoor heat exchanger is greater than or equal to the first preset temperature and the temperature difference is greater than or equal to the second preset temperature, controlling the air conditioning system to enter a frequency reduction control mode.
2. The method of claim 1, wherein after controlling the air conditioning system to enter the down-conversion control mode, the method further comprises:
controlling the running frequency of a compressor of the air conditioning system to reduce a preset frequency, and judging whether the temperature of the indoor heat exchanger and the temperature difference meet exit conditions at intervals of a preset time;
and if the temperature of the indoor heat exchanger and the temperature difference meet the exit condition, controlling the air conditioning system to exit the frequency reduction control mode.
3. The control method of an air conditioning system according to claim 2,
if the temperature of the indoor heat exchanger and the temperature difference do not meet the exit condition, judging whether the temperature of the outdoor heat exchanger is less than or equal to zero;
if the temperature of the outdoor heat exchanger is less than or equal to zero, controlling the running frequency of the compressor to continuously reduce the preset frequency;
and if the temperature of the outdoor heat exchanger is greater than zero, controlling the running frequency of the compressor to be kept unchanged.
4. The control method of an air conditioning system according to claim 3, wherein the exit condition includes: the temperature of the indoor heat exchanger is smaller than the difference between the first preset temperature and the first preset threshold or the temperature difference is smaller than the difference between the second preset temperature and the second preset threshold, wherein the first preset threshold and the second preset threshold are both larger than zero.
5. The control method of the air conditioning system according to claim 4, wherein the first preset temperature is 38 ℃, the second preset temperature is 15 ℃, and the first preset threshold value and the second preset threshold value are both 2 ℃.
6. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements the control method of an air conditioning system according to any one of claims 1 to 5.
7. A control device of an air conditioning system, characterized by comprising:
the first temperature detection unit is arranged on an outdoor heat exchanger of the air conditioning system and used for detecting the temperature of the outdoor heat exchanger;
the second temperature detection unit is arranged on an indoor heat exchanger of the air conditioning system and used for detecting the temperature of the indoor heat exchanger;
the third temperature detection unit is arranged at a return air inlet of an indoor unit of the air conditioning system and is used for detecting the return air temperature of the indoor unit;
the control unit, the control unit respectively with first temperature detect unit the second temperature detect unit with the third temperature detect unit links to each other, the control unit is used for controlling air conditioning system is in order to heat the mode operation, and is in outdoor heat exchanger's temperature is less than or equal to zero hour, acquires indoor heat exchanger's temperature with the temperature difference between the return air temperature of indoor set, and judge whether indoor heat exchanger's temperature is greater than or equal to first preset temperature just whether the temperature difference is greater than or equal to the second preset temperature, and indoor heat exchanger's temperature is greater than or equal to first preset temperature just when the temperature difference is greater than or equal to the second preset temperature, control air conditioning system gets into the mode of controlling that falls.
8. The apparatus of claim 7, wherein after the air conditioning system is controlled to enter the frequency-reduction control mode, the control unit is further configured to control an operating frequency of a compressor of the air conditioning system to decrease a preset frequency, determine whether the temperature of the indoor heat exchanger and the temperature difference satisfy an exit condition at preset intervals, and control the air conditioning system to exit the frequency-reduction control mode when the temperature of the indoor heat exchanger and the temperature difference satisfy the exit condition.
9. The control device of the air conditioning system according to claim 8, wherein the control unit is further configured to determine whether the temperature of the outdoor heat exchanger is less than or equal to zero when the temperature difference between the temperature of the indoor heat exchanger and the temperature does not satisfy the exit condition, and control the operating frequency of the compressor to continue to decrease the preset frequency when the temperature of the outdoor heat exchanger is less than or equal to zero, and control the operating frequency of the compressor to remain unchanged when the temperature of the outdoor heat exchanger is greater than zero.
10. The control device of an air conditioning system according to claim 9, wherein the exit condition includes: the temperature of the indoor heat exchanger is smaller than the difference between the first preset temperature and the first preset threshold or the temperature difference is smaller than the difference between the second preset temperature and the second preset threshold, wherein the first preset threshold and the second preset threshold are both larger than zero.
11. The control device of claim 10, wherein the first preset temperature is 38 ℃, the second preset temperature is 15 ℃, and the first preset threshold and the second preset threshold are both 2 ℃.
12. An air conditioning system characterized by comprising the control device of the air conditioning system according to any one of claims 7 to 11.
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| CN110857805B (en) * | 2018-08-24 | 2022-06-14 | 珠海格力电器股份有限公司 | Control method and system for prolonging frosting period and air conditioner |
| CN110469995A (en) * | 2019-07-28 | 2019-11-19 | 青岛海尔空调器有限总公司 | For the control method of air-conditioner defrosting, device and air-conditioning |
| CN110469996A (en) * | 2019-07-28 | 2019-11-19 | 青岛海尔空调器有限总公司 | For the control method of air-conditioner defrosting, device and air-conditioning |
| CN110469992A (en) * | 2019-07-28 | 2019-11-19 | 青岛海尔空调器有限总公司 | For the control method of air-conditioner defrosting, device and air-conditioning |
| CN110469998B (en) * | 2019-07-28 | 2022-04-19 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110469999B (en) * | 2019-07-28 | 2022-07-05 | 重庆海尔空调器有限公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110469991B (en) * | 2019-07-28 | 2022-04-19 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110469994A (en) * | 2019-07-28 | 2019-11-19 | 青岛海尔空调器有限总公司 | For the control method of air-conditioner defrosting, device and air-conditioning |
| CN110470000B (en) * | 2019-07-28 | 2022-04-15 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN112696839B (en) * | 2019-10-18 | 2022-12-27 | 广东美的制冷设备有限公司 | Air conditioning system, air conditioner and control method and control device of air conditioner |
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