CN107178873B - Variable frequency air conditioner and control method thereof - Google Patents
Variable frequency air conditioner and control method thereof Download PDFInfo
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- CN107178873B CN107178873B CN201710386718.2A CN201710386718A CN107178873B CN 107178873 B CN107178873 B CN 107178873B CN 201710386718 A CN201710386718 A CN 201710386718A CN 107178873 B CN107178873 B CN 107178873B
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Abstract
The invention provides a variable frequency air conditioner and a control method thereof, wherein the method comprises the following steps: performing room temperature PID operation according to the real-time indoor temperature difference to obtain a first frequency; performing coil PID operation according to the real-time coil temperature difference to obtain a second frequency; and selecting the smaller value of the first frequency and the second frequency to control the operation of a compressor of the variable-frequency air conditioner. The method of the invention, in the process of heating operation of the air conditioner, the first frequency and the second frequency are obtained again at intervals, and then frequency selection and compressor frequency adjustment are carried out. On one hand, the method can adjust the indoor environment temperature to be kept in a proper temperature range, improve the stability of a heating system and reduce the fluctuation of the room temperature; on the other hand, the continuous rise of the temperature of the coil pipe is restrained, and the normal operation of the indoor unit is ensured. The method further limits the maximum value of the frequency of the compressor, so that the temperature of the coil pipe is kept in a proper temperature range as far as possible, and the compressor is prevented from being repeatedly stopped and started.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a variable frequency air conditioner and a control method thereof.
Background
When the air conditioner heats, the heat exchanger of the indoor unit releases phase change heat, and the temperature gradually rises. The existing air conditioner has the protection function of preventing the coil pipe from being overhigh in temperature, namely when the temperature of the indoor heat exchanger rises to a certain value, the frequency of the compressor is gradually reduced, the heating capacity is reduced, or the air conditioner is directly stopped to temporarily stop heating, so that the temperature of the heat exchanger is reduced. When the temperature of the indoor heat exchanger is reduced to a certain value, the compressor gradually increases the frequency, and the heating quantity is increased, so that the heating effect of the indoor unit is ensured.
Such mechanical up-conversion or down-conversion has the following disadvantages: the air conditioner heating system always fluctuates continuously, the temperature of the indoor coil pipe is difficult to stabilize in a proper range, and the compressor is shut down protectively under certain working conditions because the temperature of the indoor coil pipe rises too fast and exceeds the maximum temperature allowed by the indoor unit. After a period of time, waiting for the indoor heat exchanger temperature to drop, the compressor is restarted and there is a high probability that the indoor coil temperature will again be protectively shutdown due to too fast a temperature rise. The repeated shutdown can cause the heating temperature of the air conditioner to continuously fluctuate, thereby influencing the use experience of users. In addition, the current is often very large when the compressor is started, and the frequent start and stop of the compressor inevitably causes electric energy waste.
Disclosure of Invention
in view of the above problems, the present invention has been made to provide an inverter air conditioner and a control method thereof that overcome or at least partially solve the above problems.
A further object of the present invention is to prevent the temperature of the heat exchanger of the indoor unit from being too high.
It is another further object of the present invention to improve the stability of the heating system and reduce the fluctuation of the room temperature.
It is another further object of the present invention to protect the compressor.
In one aspect, the present invention provides a method for controlling an inverter air conditioner, including: in the heating process of the air conditioner, acquiring an indoor environment temperature and an indoor target temperature set by a user, calculating the temperature difference between the indoor environment temperature and the indoor target temperature to serve as a real-time indoor temperature difference, and performing room temperature PID operation according to the real-time indoor temperature difference to obtain a first frequency; acquiring the temperature of a coil of a heat exchanger of an indoor unit of an air conditioner, calculating the temperature difference between the temperature of the coil and a preset temperature to serve as the temperature difference of the coil, and performing PID (proportion integration differentiation) operation on the coil according to the real-time temperature difference of the coil to obtain a second frequency; and selecting the smaller value of the first frequency and the second frequency to control the operation of the compressor of the variable-frequency air conditioner.
Optionally, the method further includes: judging whether the temperature of the coil pipe rises above a first threshold temperature and does not fall below a second threshold temperature; if so, executing the steps of obtaining the indoor environment temperature and the indoor target temperature set by the user and the subsequent steps until the smaller value of the first frequency and the second frequency is selected to control the compressor of the variable-frequency air conditioner to operate; if not, acquiring the temperature of a coil pipe of a heat exchanger of an indoor unit of the air conditioner, and controlling the compressor to operate according to a preset compressor operation frequency rule; the compressor operation frequency rule comprises frequency adjusting actions which are executed by the compressor corresponding to different coil temperature ranges.
Optionally, the method further includes: judging whether the temperature of the coil pipe exceeds a third threshold temperature or not; if so, controlling the compressor to stop; and restarting the compressor after the preset time.
Optionally, the step of selecting the smaller of the first frequency and the second frequency to control the operation of the compressor of the inverter air conditioner further comprises: judging whether the smaller value of the first frequency and the second frequency is greater than the preset highest frequency or not; and if so, controlling the compressor to operate according to the preset highest frequency.
optionally, the first threshold temperature is 57 ℃ to 59 ℃; the second threshold temperature is 53 ℃ to 55 ℃; the preset temperature is 54 ℃ to 56 ℃.
In another aspect, the present invention further provides an inverter air conditioner, including: a refrigerant circulating system consisting of a compressor, an indoor machine heat exchanger and an outdoor machine heat exchanger; an indoor temperature detection module configured to detect and acquire an indoor ambient temperature; the target temperature acquisition module is configured to acquire an indoor target temperature set by a user; the coil pipe temperature detection module is configured to detect and acquire the surface temperature of a coil pipe of the indoor unit heat exchanger; the first frequency calculation module is electrically connected with the indoor temperature detection module and the target temperature acquisition module, is configured to calculate the temperature difference between the indoor environment temperature and the indoor target temperature to serve as a real-time indoor temperature difference, and performs room temperature PID operation according to the real-time indoor temperature difference to obtain a first frequency; the second frequency calculation module is electrically connected with the coil pipe temperature detection module and is configured to calculate the temperature difference between the coil pipe temperature and the preset temperature to serve as the coil pipe temperature difference, and coil pipe PID operation is carried out according to the real-time coil pipe temperature difference to obtain a second frequency; and the control module is electrically connected with the first frequency calculation module and the second frequency calculation module and is configured to select the smaller value of the first frequency and the second frequency to control the operation of the compressor of the variable-frequency air conditioner.
Optionally, the control module is further electrically connected to the coil temperature detection module and configured to: selecting the smaller value of the first frequency and the second frequency to control the compressor of the inverter air conditioner to operate under the condition that the temperature of the coil pipe rises above a first threshold temperature and does not fall below a second threshold temperature; under the condition that the temperature of the coil pipe is not increased to be higher than a first threshold value temperature or is reduced to be lower than a second threshold value temperature, the temperature of the coil pipe of a heat exchanger of an indoor unit of an air conditioner is obtained, and the compressor is controlled to operate according to a preset compressor operation frequency rule; the compressor operation frequency rule comprises frequency adjusting actions which are executed by the compressor corresponding to different coil temperature ranges.
Optionally, the control module is further configured to control the compressor to stop if the temperature of the coil exceeds a third threshold temperature, and restart the compressor after a preset time.
Optionally, the control module is further configured to control the compressor to operate at a preset maximum frequency if the smaller of the first frequency and the second frequency is greater than the preset maximum frequency.
The invention provides a control method of a variable frequency air conditioner, which comprises the following steps: in the heating process of the air conditioner, carrying out room temperature PID operation according to the real-time indoor temperature difference to obtain a first frequency; performing coil PID operation according to the real-time coil temperature difference to obtain a second frequency; and selecting the smaller value of the first frequency and the second frequency to control the operation of a compressor of the variable-frequency air conditioner. The method of the invention, in the process of heating operation of the air conditioner, the first frequency and the second frequency are obtained again at intervals, and then frequency selection and compressor frequency adjustment are carried out. On one hand, the method can adjust the indoor environment temperature to be kept in a proper temperature range, improve the stability of a heating system, reduce the fluctuation of the room temperature and improve the comfort level of a user; on the other hand, the continuous rise of the temperature of the coil pipe is restrained, and the normal operation of the indoor unit is ensured. The method further limits the maximum value of the frequency of the compressor, so that the temperature of the coil pipe is kept in a proper temperature range as far as possible, and the compressor is prevented from being repeatedly stopped and started.
further, the method of the present invention further comprises: judging whether the smaller value of the first frequency and the second frequency is greater than the preset highest frequency or not; if so, controlling the compressor to operate at a preset maximum frequency to further limit the frequency of the compressor so as to promote the temperature of the coil to be reduced. The method of the invention further sets the preset maximum frequency which can be reached by the compressor, so as to ensure the normal operation of the compressor.
the above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic block diagram of an inverter air conditioner according to one embodiment of the present invention;
FIG. 2 is a graph illustrating a coil temperature of an inverter air conditioner according to an embodiment of the present invention as a function of time;
Fig. 3 is a schematic view of a control method of an inverter air conditioner according to an embodiment of the present invention;
Fig. 4 is a flowchart of a control method of an inverter air conditioner according to an embodiment of the present invention.
Detailed Description
The present embodiment provides an inverter air conditioner, as shown in fig. 1, which includes: the system comprises a refrigerant circulation system consisting of a compressor 10, an indoor heat exchanger 20 and an outdoor heat exchanger, an indoor temperature detection module 30, a target temperature acquisition module 40, a coil temperature detection module 50, a first frequency calculation module 60, a second frequency calculation module 70 and a control module 80.
the indoor temperature detecting module 30 may include a temperature sensor disposed on a surface of the indoor unit casing of the air conditioner, and is configured to detect and obtain the indoor ambient temperature in real time. Specifically, when the air conditioner is started to operate, the indoor environment temperature of a room where the air conditioner is located is detected in real time, and the temperature detected in real time is used as the real-time indoor environment temperature. The real-time indoor environment temperature refers to the indoor environment temperature which is continuously obtained and updated according to the set temperature sampling frequency after the air conditioner is started to operate. The real-time acquisition of the indoor ambient temperature can be achieved using existing techniques. For example, the temperature sensor arranged at or near the air inlet of the air conditioner is used for detecting the temperature of the inlet air, and the main control panel of the air conditioner acquires the temperature of the inlet air by acquiring and processing the output signal of the temperature sensor, and takes the temperature as the real-time indoor environment temperature.
And a target temperature obtaining module 40 configured to obtain the indoor target temperature set by the user. The indoor target temperature refers to a target temperature that the indoor environment is expected to reach, and the set indoor target temperature may be a temperature value input by a user through a remote controller or an air conditioner control terminal or an air conditioner panel, or may be a set value automatically called by an air conditioner main control panel. No matter which way is adopted for setting the temperature value, the temperature value can be acquired by the air conditioner main control board.
and a coil temperature detection module 50 configured to detect and acquire the surface temperature of the coil of the indoor unit heat exchanger 20. In the present embodiment, the indoor unit heat exchanger 20 (i.e., the evaporator) of the air conditioner is a coil pipe constituting a refrigerant conveying passage. The coil temperature sensing module 50 includes a temperature sensor disposed on the surface of the coil. The coil temperature detection module 50 is used to detect the surface temperature of the coil in real time, and the control module 80 adjusts the operating frequency of the compressor 10 according to the surface temperature of the coil. Under the general heating condition, the temperature of the coil is preferably stabilized in an appropriate temperature range, so that the heating effect of the air conditioner is prevented from being influenced by the excessively low temperature of the coil; on the other hand, the normal use of the indoor unit of the air conditioner is prevented from being influenced by the overhigh temperature of the coil pipe (the normal use of other components in the indoor unit is possibly influenced by the overhigh temperature in the indoor unit).
in order to achieve the above purpose, the inverter air conditioner in this embodiment has a compressor operation frequency rule built therein, and the control module 80 determines the operation frequency of the compressor 10 by querying the compressor operation frequency rule according to the current surface temperature of the coil, so that the temperature of the coil is stabilized within a suitable temperature range. The compressor operating frequency rule includes frequency adjustment actions to be performed by the compressor 10 for different coil temperature ranges. The frequency adjustment operation includes: the compressor is used for increasing frequency, reducing frequency or keeping the frequency unchanged according to a certain speed and the like.
The table is a schematic listing of the compressor operating frequency rule according to one embodiment of the present invention.
Watch 1
| temperature range | Frequency adjustment action | |
| first temperature range | 56 ℃ to 58 DEG C | Down conversion at a rate of 1Hz/5s |
| Second temperature range | 54 ℃ to 56 DEG C | Keeping the frequency constant |
| Third temperature range | 50 ℃ to 54 DEG C | up-conversion at a rate of 1Hz/5s |
| Fourth temperature range | 48 ℃ to 50 DEG C | Up-conversion at a rate of 2Hz/5s |
| Fifth temperature range | Below 48 deg.C | Recovering to normal |
As shown in table one and fig. 2, the coil temperature gradually increases from a low temperature when the air conditioner is just turned on. When the coil temperature rises to 48 to 50 ℃, the air conditioner compressor 10 rapidly increases the frequency at a rate of 2Hz/5s to continue to increase the coil temperature, so that the indoor heat exchanger 20 generates more heat. When the coil temperature rises to 50 ℃ to 54 ℃, the air conditioner compressor 10 slowly increases the frequency at a rate of 1Hz/5s to slow the rate of temperature rise of the coil. When the coil temperature rises to 54 ℃ to 56 ℃, the compressor 10 maintains the frequency unchanged so that the coil temperature is maintained in the temperature range of 54 ℃ to 56 ℃. As the coil temperature continues to rise to 56℃ to 58℃, the normal temperature range has been exceeded, at which time compressor 10 slowly ramps down at 1Hz/5s to reduce the coil temperature.
In some cases, the above adjustment mechanism does not completely prevent the coil temperature of the indoor unit heat exchanger 20 from continuously increasing. In the present embodiment, when the coil temperature rises above the first threshold temperature, the air conditioner adjusts the operating frequency of the compressor 10 using a PID control method (as shown in fig. 2). The first threshold temperature may be 57 ℃ to 59 ℃, preferably 58 ℃.
Specifically, the first frequency calculation module 60 is electrically connected to the indoor temperature detection module 30 and the target temperature acquisition module 40, and is configured to calculate a temperature difference between the indoor ambient temperature and the indoor target temperature as a real-time indoor temperature difference, and perform a room temperature PID operation according to the real-time indoor temperature difference to obtain the first frequency. The first frequency calculation module 60 calculates a temperature difference between the real-time indoor ambient temperature and the set indoor target temperature as a real-time indoor temperature difference after acquiring the real-time indoor ambient temperature and the set indoor target temperature. Then, a room temperature PID operation is performed according to the real-time indoor temperature difference, and a frequency for controlling the compressor 10 is obtained. Those skilled in the art will appreciate that the calculated compressor frequency is a time-varying frequency at which operation of the compressor 10 adjusts the indoor ambient temperature to constantly move toward the indoor target temperature. The above frequency is defined as a first frequency. The specific method of performing the room temperature PID operation according to the temperature difference to obtain the target frequency for controlling the compressor 10 can be implemented by the prior art, and will not be elaborated and limited herein.
The second frequency calculation module 70 is electrically connected to the coil temperature detection module 50, and is configured to calculate a temperature difference between the coil temperature and a preset temperature, as the coil temperature difference, and perform a coil PID operation according to the real-time coil temperature difference to obtain a second frequency. In order to maintain the coil temperature within the desired temperature range (54 ℃ to 56 ℃), the second frequency calculation module 70 performs coil PID calculations. Specifically, after the real-time coil temperature and the preset temperature are obtained, the second frequency calculation module 70 calculates a temperature difference between the real-time coil temperature and the preset temperature as the real-time coil temperature difference. The preset temperature is the optimum temperature of the coil, and the preset temperature can be stored in the main control board of the air conditioner in advance, and in this embodiment, the preset temperature can be 54-56 ℃, and is preferably 55 ℃. And performing room temperature PID operation according to the real-time coil temperature difference to obtain a frequency for controlling the compressor 10, wherein the compressor 10 operates according to the frequency to enable the coil temperature to continuously change towards the preset temperature. The above frequency is defined as the second frequency.
The control module 80 is electrically connected to the first frequency calculating module 60 and the second frequency calculating module 70, and is configured to select the smaller value of the first frequency and the second frequency to control the operation of the compressor 10 of the inverter air conditioner. In the present embodiment, after the control module 80 acquires the two frequencies at the same time, the smaller one of the two frequencies is selected to control the operation of the compressor 10, and those skilled in the art can understand that the frequency selection is a continuous process, that is, every time a period of time elapses, the control module 80 needs to acquire the first frequency and the second frequency again, and then select and adjust the frequency of the compressor 10. The inverter air conditioner of this embodiment can further limit the maximum value of the frequency of the compressor 10, and on the basis of ensuring that the temperature of the coil pipe continuously decreases, the indoor ambient temperature reaches the indoor target temperature as soon as possible.
After the air conditioner adopts the PID control, the temperature of the coil reaches a peak value and then begins to drop. To further prevent the coil temperature from rising too quickly, the air conditioner sets a third threshold temperature. The control module 80 is further configured to control the compressor 10 to stop when the coil temperature exceeds the third threshold temperature, and restart the compressor 10 after a preset time to protect the indoor unit heat exchanger 20. The third threshold temperature may be 60 ℃, and the preset time may be 3 minutes.
in other embodiments of the present invention, the air conditioner is also preset with a preset maximum frequency that allows the compressor 10 to operate. The control module 80 is further configured to control the compressor 10 to operate at the preset maximum frequency if the lesser of the first frequency and the second frequency is greater than the preset maximum frequency to further limit the frequency of the compressor 10 to cause the coil temperature to decrease.
As shown in fig. 2, the coil temperature decreases from the peak value, and after the coil temperature decreases below the second threshold temperature, the air conditioner stops adjusting the operating frequency of the compressor 10 by using the PID control method. The control module 80 determines the operating frequency of the compressor 10 by querying the operating frequency rule of the compressor 10 according to the current surface temperature of the coil, so as to prevent the heating effect from being influenced by too low temperature of the coil. The second threshold temperature may be 53 ℃ to 55 ℃, preferably 54 ℃.
The embodiment also provides a control method of the inverter air conditioner. Fig. 3 is a schematic view of a control method of an inverter air conditioner according to an embodiment of the present invention, the method including:
Step S302, acquiring an indoor environment temperature and an indoor target temperature set by a user, calculating a temperature difference between the indoor environment temperature and the indoor target temperature to serve as a real-time indoor temperature difference, and performing room temperature PID calculation according to the real-time indoor temperature difference to acquire a first frequency. It will be appreciated by those skilled in the art that the calculated first frequency is a time-varying frequency value that can adjust the indoor ambient temperature to constantly change toward the indoor target temperature if the compressor 10 is continuously operated at the frequency value. The specific method of performing the room temperature PID operation according to the temperature difference to obtain the target frequency for controlling the compressor 10 can be implemented by the prior art, and will not be elaborated and limited herein.
Step S304, acquiring the coil temperature of the heat exchanger 20 of the indoor unit of the air conditioner, calculating the temperature difference between the coil temperature and the preset temperature to be used as the coil temperature difference, and performing coil PID operation according to the real-time coil temperature difference to obtain a second frequency. In order to maintain the coil temperature within the desired temperature range (54 ℃ to 56 ℃), the second frequency calculation module 70 performs coil PID calculations. The predetermined temperature is the optimum temperature for the coil, and in this embodiment may be 54-56 deg.C, preferably 55 deg.C. And performing room temperature PID operation according to the real-time coil temperature difference to obtain a frequency for controlling the compressor 10, wherein if the compressor 10 operates according to the second frequency, the coil temperature can be continuously changed towards the preset temperature.
And S306, selecting the smaller value of the first frequency and the second frequency to control the operation of the compressor 10 of the inverter air conditioner. After the two frequencies are acquired at the same time, the smaller one of the two frequencies is selected to control the operation of the compressor 10, and those skilled in the art can understand that the frequency selection is a continuous process, that is, every time a period of time elapses, the first frequency and the second frequency need to be acquired again, and then the frequency selection and the frequency adjustment of the compressor 10 are performed. The inverter air conditioner of this embodiment can further limit the maximum value of the frequency of the compressor 10, and on the basis of ensuring that the temperature of the coil pipe continuously decreases, the indoor ambient temperature reaches the indoor target temperature as soon as possible.
Fig. 4 is a flowchart of a threshold adjustment method according to an embodiment of the present invention, which sequentially performs the following steps:
Step S402, detecting the coil temperature of the indoor unit heat exchanger 20 in real time. The coil temperature is monitored in real time to facilitate subsequent adjustment of the frequency of the compressor 10.
Step S404, determine whether the coil temperature rises above the first threshold temperature and does not fall below the second threshold temperature. In this embodiment, the air conditioner selects the frequency modulation of the compressor 10 based on the temperature range in which the coil is located.
Step S406, if the determination result in the step S404 is yes, obtaining the indoor ambient temperature and the indoor target temperature set by the user, calculating a temperature difference between the indoor ambient temperature and the indoor target temperature as a real-time indoor temperature difference, and performing a room temperature PID operation according to the real-time indoor temperature difference to obtain the first frequency. If the tube temperature rises above the first threshold temperature and does not fall below the second threshold temperature, the operating frequency of the compressor 10 is adjusted using a PID control method.
And step S408, if the judgment result in the step S404 is negative, acquiring the coil temperature of the heat exchanger 20 of the indoor unit of the air conditioner, and controlling the compressor 10 to operate according to the preset compressor operation frequency rule. If the coil temperature has not risen above the first threshold temperature or has fallen below the second threshold temperature, then the operation of the compressor 10 is controlled according to preset compressor operating frequency rules. The first threshold temperature may be 57 ℃ to 59 ℃, preferably 58 ℃. The second threshold temperature may be 53 ℃ to 55 ℃, preferably 54 ℃.
and step S410, acquiring the coil temperature of the heat exchanger 20 of the indoor unit of the air conditioner, calculating the temperature difference between the coil temperature and the preset temperature to serve as the coil temperature difference, and performing coil PID operation according to the real-time coil temperature difference to acquire a second frequency.
In step S412, it is determined whether the smaller value of the first frequency and the second frequency is greater than a preset maximum frequency. In other embodiments of the present invention, the air conditioner is also preset with a preset maximum frequency that allows the compressor 10 to operate.
and step S414, if the judgment result in the step S412 is negative, selecting the smaller value of the first frequency and the second frequency to control the operation of the compressor 10 of the inverter air conditioner.
In step S416, if the determination result in step S412 is yes, the compressor 10 is controlled to operate according to the preset maximum frequency. And controlling the compressor 10 to operate at the preset maximum frequency in the case that the smaller value of the first frequency and the second frequency is greater than the preset maximum frequency, so as to further limit the frequency of the compressor 10, thereby promoting the temperature of the coil to be reduced.
To further prevent the coil temperature from rising too quickly, in this embodiment, a third threshold temperature is also set. And under the condition that the temperature of the coil pipe exceeds the third threshold temperature, controlling the compressor 10 to stop, and restarting the compressor 10 after a preset time so as to protect the heat exchanger 20 of the indoor unit. The third threshold temperature may be 60 ℃, and the preset time may be 3 minutes.
thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. A control method of an inverter air conditioner comprises the following steps:
In the heating process of the air conditioner, acquiring an indoor environment temperature and an indoor target temperature set by a user, calculating the temperature difference between the indoor environment temperature and the indoor target temperature to serve as a real-time indoor temperature difference, and performing room temperature PID operation according to the real-time indoor temperature difference to obtain a first frequency;
Acquiring the temperature of a coil of a heat exchanger of an indoor unit of an air conditioner, calculating the temperature difference between the temperature of the coil and a preset temperature to serve as the temperature difference of the coil, and performing PID (proportion integration differentiation) operation on the coil according to the real-time temperature difference of the coil to obtain a second frequency; and
Selecting the smaller value of the first frequency and the second frequency to control the operation of a compressor of the variable-frequency air conditioner; wherein, still include:
Judging whether the temperature of the coil pipe rises above a first threshold temperature and does not fall below a second threshold temperature;
if so, executing the steps of obtaining the indoor environment temperature and the indoor target temperature set by the user and the subsequent steps until the smaller value of the first frequency and the second frequency is selected to control the compressor of the variable frequency air conditioner to operate;
If not, acquiring the temperature of a coil pipe of a heat exchanger of an indoor unit of the air conditioner, and controlling the compressor to operate according to a preset compressor operation frequency rule; wherein
The compressor operation frequency rule comprises frequency adjustment actions which are executed by the compressor corresponding to different coil temperature ranges.
2. The method of claim 1, further comprising:
Judging whether the temperature of the coil pipe exceeds a third threshold temperature or not;
If yes, controlling the compressor to stop;
and restarting the compressor after the preset time.
3. the method of claim 1, wherein selecting the lesser of the first frequency and the second frequency to control operation of a compressor of the inverter air conditioner further comprises:
Judging whether the smaller value of the first frequency and the second frequency is greater than a preset highest frequency or not;
and if so, controlling the compressor to operate according to the preset highest frequency.
4. the method of claim 1, wherein
The first threshold temperature is 57 ℃ to 59 ℃;
The second threshold temperature is 53 ℃ to 55 ℃;
The preset temperature is 54 ℃ to 56 ℃.
5. An inverter air conditioner comprising:
A refrigerant circulating system consisting of a compressor, an indoor machine heat exchanger and an outdoor machine heat exchanger;
An indoor temperature detection module configured to detect and acquire an indoor ambient temperature;
The target temperature acquisition module is configured to acquire an indoor target temperature set by a user;
The coil pipe temperature detection module is configured to detect and acquire the surface temperature of a coil pipe of the indoor unit heat exchanger;
The first frequency calculation module is electrically connected with the indoor temperature detection module and the target temperature acquisition module, is configured to calculate the temperature difference between the indoor environment temperature and the indoor target temperature to serve as a real-time indoor temperature difference, and performs room temperature PID (proportion integration differentiation) operation according to the real-time indoor temperature difference to acquire a first frequency;
The second frequency calculation module is electrically connected with the coil pipe temperature detection module and is configured to calculate the temperature difference between the coil pipe temperature and a preset temperature to serve as the coil pipe temperature difference, and coil pipe PID operation is carried out according to the real-time coil pipe temperature difference to obtain a second frequency; and
The control module is electrically connected with the first frequency calculation module and the second frequency calculation module and is configured to select the smaller value of the first frequency and the second frequency to control the operation of a compressor of the inverter air conditioner;
Wherein the control module is further electrically connected to the coil temperature detection module and configured to: selecting the smaller value of the first frequency and the second frequency to control the compressor of the inverter air conditioner to operate under the condition that the temperature of the coil pipe rises above a first threshold temperature and does not fall below a second threshold temperature; under the condition that the temperature of the coil pipe does not rise above a first threshold value temperature or fall below a second threshold value temperature, acquiring the temperature of the coil pipe of a heat exchanger of an indoor unit of an air conditioner, and controlling the compressor to operate according to a preset compressor operation frequency rule; the compressor operation frequency rule comprises frequency adjustment actions which are executed by the compressor corresponding to different coil temperature ranges.
6. the inverter air conditioner of claim 5, wherein
the control module is further configured to control the compressor to stop when the temperature of the coil exceeds a third threshold temperature, and restart the compressor after a preset time.
7. the inverter air conditioner of claim 5, wherein
the control module is further configured to control the compressor to operate at a preset maximum frequency if the smaller of the first frequency and the second frequency is greater than the preset maximum frequency.
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| CN107747793B (en) * | 2017-10-16 | 2020-10-13 | 广东美的暖通设备有限公司 | Variable frequency air conditioner and control method and device thereof |
| CN109916023B (en) * | 2018-07-23 | 2021-04-16 | 深圳市屹智科技开发有限公司 | Multi-parameter control type air conditioner |
| CN109945434B (en) * | 2019-03-20 | 2020-05-05 | 珠海格力电器股份有限公司 | Air conditioner control method and device and air conditioner |
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