CN107421055B - Variable frequency air conditioner, shutdown control method and computer readable storage medium - Google Patents
Variable frequency air conditioner, shutdown control method and computer readable storage medium Download PDFInfo
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- CN107421055B CN107421055B CN201710310412.9A CN201710310412A CN107421055B CN 107421055 B CN107421055 B CN 107421055B CN 201710310412 A CN201710310412 A CN 201710310412A CN 107421055 B CN107421055 B CN 107421055B
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Abstract
The invention discloses a shutdown control method of a variable frequency air conditioner, which comprises the following steps: when the variable frequency air conditioner receives a shutdown signal, reducing the running frequency of the compressor until the running frequency reaches a preset frequency; acquiring the evaporation pressure and the condensation pressure of the compressor, and calculating the difference between the evaporation pressure and the condensation pressure to obtain a pressure difference value; and when the pressure difference value is smaller than a preset shutdown pressure difference threshold value, controlling the compressor to stop running. The invention also discloses a variable frequency air conditioner and a computer readable storage medium. The invention can reduce the vibration and stress of the piping of the compressor of the inverter air conditioner, prolong the service life of the piping and improve the system stability of the inverter air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a variable frequency air conditioner, a shutdown control method and a computer readable storage medium.
Background
In the inverter air conditioning system, when the pressure of the refrigerant is high during high-frequency operation, the pipeline has certain deformation, if the compressor is directly stopped, the refrigerant can rapidly stop flowing, the pressure of the refrigerant is suddenly lost, and the deformation of the pipeline is immediately rebounded and oscillated, so that the vibration and the stress of the tubing of the compressor are overlarge, and even the risk of tube breakage of the tubing exists. Therefore, how to reduce the vibration and stress of the pipes of the compressor at the shutdown time of the inverter air conditioner is a problem to be solved.
Disclosure of Invention
The invention mainly aims to provide an inverter air conditioner, a shutdown control method and a computer readable storage medium, aiming at reducing the vibration and stress of a piping of a compressor of the inverter air conditioner, prolonging the service life of the piping and improving the system stability of the inverter air conditioner.
In order to achieve the purpose, the shutdown control method of the variable frequency air conditioner provided by the invention comprises the following steps:
when the variable frequency air conditioner receives a shutdown signal, reducing the running frequency of the compressor until the running frequency reaches a preset frequency;
acquiring the evaporation pressure and the condensation pressure of the compressor, and calculating the difference between the evaporation pressure and the condensation pressure to obtain a pressure difference value;
and when the pressure difference value is smaller than a preset shutdown pressure difference threshold value, controlling the compressor to stop running.
Preferably, the step of reducing the operating frequency of the compressor when the inverter air conditioner receives the shutdown signal further includes:
and when the variable frequency air conditioner receives a stop signal, controlling the compressor to reduce the frequency at a constant speed until the lowest running frequency is reached.
Preferably, the step of reducing the operating frequency of the compressor when the inverter air conditioner receives the shutdown signal further includes:
the method comprises the steps that when the variable frequency air conditioner receives a stop signal, the current running frequency of a compressor is obtained;
judging a frequency interval where the current running frequency is located;
when the frequency interval where the current operating frequency is located is a first frequency band, controlling the compressor to operate at a corresponding first speed reduction frequency;
and when the frequency interval in which the current operating frequency is located is a second frequency band, controlling the compressor to operate at a corresponding second speed reduction frequency until the lowest operating frequency is reached.
Preferably, the first frequency band range is greater than the second frequency band range, and the second reduced speed frequency is smaller than the first reduced speed frequency.
Preferably, the shutdown control method of the inverter air conditioner further includes:
acquiring the running time of the compressor running at the lowest running frequency;
and controlling the compressor to stop running when the running time reaches a preset running time threshold value.
Preferably, the shutdown control method of the inverter air conditioner further includes:
when the variable frequency air conditioner receives a stop signal, acquiring the frequency reduction time of the compressor for performing frequency reduction operation;
and when the frequency reduction time reaches a preset frequency reduction time threshold value, controlling the compressor to stop running.
In order to achieve the above object, the present invention also provides an inverter air conditioner, including:
a shutdown control program configured to implement the steps of the shutdown control method of the inverter air conditioner as described above.
In order to achieve the above object, the present invention further provides a computer readable storage medium having a shutdown control program of an inverter air conditioner stored thereon, where the shutdown control program of the inverter air conditioner is executed by a processor to implement the steps of the shutdown control method of the inverter air conditioner as described above.
According to the variable frequency air conditioner, the shutdown control method and the computer readable storage medium provided by the invention, when the variable frequency air conditioner receives a shutdown signal, the operation frequency of the compressor is reduced until the operation frequency reaches a preset frequency, then the evaporation pressure and the condensation pressure of the compressor are obtained, the difference value between the evaporation pressure and the condensation pressure is calculated to obtain a pressure difference value, and when the pressure difference value is smaller than a preset shutdown pressure difference threshold value, the compressor is controlled to stop operating. In this way, by reducing the operating frequency of the compressor to a predetermined frequency and controlling the compressor to stop when the calculated pressure difference is less than a predetermined stop pressure difference threshold, the vibration and stress of the piping of the compressor of the inverter air conditioner can be reduced, the service life of the piping can be prolonged, and the system stability of the inverter air conditioner can be improved.
Drawings
FIG. 1 is a schematic structural diagram of an inverter air conditioner in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating an embodiment of a shutdown control method for an inverter air conditioner according to the present invention;
FIG. 3 is a detailed flowchart of the step in FIG. 2, when the inverter air conditioner receives a shutdown signal, reducing the operating frequency of the compressor until a predetermined frequency is reached;
FIG. 4 is a detailed diagram of the inverter air conditioner of the present invention determining whether to control the compressor to stop according to the relationship between the pressure difference and the predetermined stop pressure difference threshold;
FIG. 5 is a schematic flow chart illustrating a shutdown control method for an inverter air conditioner according to another embodiment of the present invention;
FIG. 6 is a specific diagram illustrating the inverter air conditioner of the present invention determining whether to control the compressor to stop according to the relationship between the operation time of the compressor operating at the predetermined frequency and the preset time threshold;
FIG. 7 is a schematic flow chart illustrating a shutdown control method of an inverter air conditioner according to still another embodiment of the present invention;
fig. 8 is a specific schematic diagram of the inverter air conditioner according to the relationship between the down-conversion time of the compressor for down-conversion operation and the preset down-conversion time threshold, and determining whether to control the compressor to stop.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the inverter air conditioner of the present invention includes: a processor 1001, such as a CPU, a user interface 1002, a memory 1003, and a communication bus 1004. Wherein a communication bus 1004 is used to enable connective communication between these components. The user interface 1002 may include a Display screen (Display), an input unit such as a remote controller. The memory 1003 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 1003 may alternatively be a storage device separate from the processor 1001.
The inverter air conditioner also comprises an indoor unit, an outdoor unit, a compressor arranged in the outdoor unit, various sensors for detecting parameters such as temperature, pressure, humidity, refrigerant flow and the like.
Those skilled in the art will appreciate that the inverter air conditioner configuration shown in FIG. 1 does not constitute a limitation of inverter air conditioners and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, the memory 1003, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a shutdown control program of the inverter air conditioner.
In the variable frequency air conditioner shown in fig. 1, the user interface 1002 is mainly used for receiving a user instruction, such as cooling or heating, triggered by a user touching the display screen or inputting an instruction in the input unit; and the processor 1001 may be configured to call a shutdown control program of the inverter air conditioner stored in the memory 1003, and perform the following operations: when the variable frequency air conditioner receives a shutdown signal, reducing the running frequency of the compressor until the running frequency reaches a preset frequency;
acquiring the evaporation pressure and the condensation pressure of the compressor, and calculating the difference between the evaporation pressure and the condensation pressure to obtain a pressure difference value;
and when the pressure difference value is smaller than a preset shutdown pressure difference threshold value, controlling the compressor to stop running.
Further, the processor 1001 may call the shutdown control program stored in the memory 1003, and also perform the following operations:
and when the variable frequency air conditioner receives a stop signal, controlling the compressor to reduce the frequency at a constant speed until the lowest running frequency is reached.
Further, the processor 1001 may call the shutdown control program stored in the memory 1003, and also perform the following operations:
the method comprises the steps that when the variable frequency air conditioner receives a stop signal, the current running frequency of a compressor is obtained;
judging a frequency interval where the current running frequency is located;
when the frequency interval where the current operating frequency is located is a first frequency band, controlling the compressor to operate at a corresponding first speed reduction frequency;
and when the frequency interval in which the current operating frequency is located is a second frequency band, controlling the compressor to operate at a corresponding second speed reduction frequency until the lowest operating frequency is reached.
Further, the processor 1001 may call the shutdown control program stored in the memory 1003, and also perform the following operations:
the first frequency range is larger than the second frequency range, and the second speed reduction frequency is smaller than the first speed reduction frequency.
Further, the processor 1001 may call the shutdown control program stored in the memory 1003, and also perform the following operations:
acquiring the running time of the compressor running at the lowest running frequency;
and controlling the compressor to stop running when the running time reaches a preset running time threshold value.
Further, the processor 1001 may call the shutdown control program stored in the memory 1003, and also perform the following operations:
when the variable frequency air conditioner receives a stop signal, acquiring the frequency reduction time of the compressor for performing frequency reduction operation;
and when the frequency reduction time reaches a preset frequency reduction time threshold value, controlling the compressor to stop running.
Referring to fig. 2, in a first embodiment, the present invention provides a shutdown control method for an inverter air conditioner, including:
step S1, when the variable frequency air conditioner receives the shutdown signal, reducing the running frequency of the compressor until the running frequency reaches the preset frequency;
in this embodiment, the condition that the inverter air conditioner receives the shutdown signal mainly includes the shutdown signal triggered by the user through the remote controller or the operation panel. The air conditioning system mainly relates to the variable frequency air conditioner, so the operating frequency of the compressor can be dynamically changed, and the operating frequency of the compressor which operates at high frequency is adjusted and operated when the shutdown signal is received by the air conditioning system in the embodiment of the invention, so that the compressor is prevented from being directly shut down, and the phenomenon of pipe breakage of a pipe of the compressor is prevented.
In this embodiment, the manner of reducing the operating frequency of the compressor may include various ways, such as controlling the compressor to down-convert at a constant rate until a predetermined frequency is reached; alternatively, the compressor is controlled to down-convert at a variable rate until a predetermined frequency is reached, specifically, the compressor may down-convert at a greater rate and then down-convert at a lesser rate until the predetermined frequency is reached. In addition, the running time of the down conversion at different rates can be reasonably set according to actual needs.
In this embodiment, the predetermined frequency is preferably set as the lowest operating frequency of the compressor of the corresponding model of the inverter air conditioner, and of course, in other embodiments, other frequencies may also be used, for example, the predetermined frequency may be selected as a certain frequency value between the highest operating frequency and the highest operating frequency according to actual needs.
Step S2, obtaining the evaporation pressure and the condensation pressure of the compressor, and calculating the difference between the evaporation pressure and the condensation pressure to obtain a pressure difference value;
in this embodiment, the evaporating pressure may be detected by a pressure sensor installed at the exhaust port of the compressor, the condensing pressure may be detected by another pressure sensor installed at the suction port of the compressor, and the detected pressure values are sent to a processor by the pressure sensors, so that the processor calculates a difference between the evaporating pressure and the condensing pressure, thereby obtaining a pressure difference, that is, a refrigerant pressure. Of course, in other embodiments, the pressure sensors may be disposed at other reasonable locations.
And step S3, controlling the compressor to stop running when the pressure difference value is smaller than a preset shutdown pressure difference threshold value.
In this embodiment, in order to reduce the piping vibration and stress of the compressor at the shutdown time of the inverter air conditioner, a direct shutdown method is not adopted under normal conditions unless the air conditioning system fails (is abnormal), but the compressor is gradually reduced in frequency and stopped until the refrigerant pressure is lower. Therefore, the evaporating pressure and the condensing pressure of the compressor can be monitored in real time or at regular time, the difference between the evaporating pressure and the condensing pressure is calculated to obtain a pressure difference, if the monitored pressure difference is greater than or equal to the preset shutdown pressure difference threshold value, such as 0.5MPa, the corresponding refrigerant pressure is still larger at the moment, and the compressor is further controlled to continuously operate at the preset frequency; if the monitored pressure difference value is smaller than the preset shutdown pressure difference threshold value, the corresponding refrigerant pressure reaches a safety range at the moment, and therefore the compressor can be controlled to stop running. Of course, in other embodiments, the predetermined shutdown pressure difference threshold may be set reasonably according to actual needs.
In the inverter air-conditioning system, the refrigerant pressure is the pressure difference between the condensing pressure and the evaporating pressure, so that the difference between the evaporating pressure and the condensing pressure can be directly calculated according to the obtained evaporating pressure and the condensing pressure to obtain the pressure difference, namely the compressor can be controlled to stop according to the pressure difference so as to reduce the vibration and the stress at the moment of stopping.
According to the shutdown control method of the variable frequency air conditioner, when the variable frequency air conditioner receives a shutdown signal, the operation frequency of a compressor is reduced until the operation frequency reaches a preset frequency, then the evaporation pressure and the condensation pressure of the compressor are obtained, the difference value between the evaporation pressure and the condensation pressure is calculated to obtain a pressure difference, and when the pressure difference is smaller than a preset shutdown pressure difference threshold value, the compressor is controlled to stop operating. In this way, by reducing the operating frequency of the compressor to a predetermined frequency and controlling the compressor to stop when the calculated pressure difference is less than a predetermined stop pressure difference threshold, the vibration and stress of the piping of the compressor of the inverter air conditioner can be reduced, the service life of the piping can be prolonged, and the system stability of the inverter air conditioner can be improved.
In the second embodiment, based on the first embodiment shown in fig. 2, the step S1 further includes:
and when the variable frequency air conditioner receives a stop signal, controlling the compressor to reduce the frequency at a constant speed until the lowest running frequency is reached.
In this embodiment, when the inverter air conditioner receives the shutdown signal, the compressor may be controlled to perform frequency reduction at a constant rate until a predetermined frequency, such as a minimum operating frequency, is reached. Specifically, the inverter air conditioner may control the compressor to perform frequency reduction at a constant rate, such as 1Hz/s (assuming that a rated operation frequency of the compressor is 90Hz, and an actual shutdown process is 30s to 90s), assuming that the compressor initially operates at the operation frequency of 90Hz, the compressor operates at the operation frequency of 80Hz after 10s, operates at the operation frequency of 70Hz after 20s, and so on until the lowest operation frequency is reached.
It should be understood that the specific values of the constant rate recited in the present embodiment are not limitative, but can be set appropriately according to the actual situation.
In the third embodiment, referring to fig. 3, on the basis of the first embodiment shown in fig. 2, the step S1 further includes:
step S11, when the variable frequency air conditioner receives a stop signal, acquiring the current operating frequency of the compressor;
step S12, judging the frequency interval of the current operation frequency;
in this embodiment, when the inverter air conditioner receives a shutdown signal, the current operating frequency of the compressor is obtained, and a frequency interval in which the current operating frequency is located is determined, where the specifically set frequency interval may be two, three, or more, and two are taken as an example for description below.
Step S13, when the frequency interval where the current operation frequency is located is a first frequency band, controlling the compressor to operate at a corresponding first speed reduction frequency;
in this embodiment, it is assumed that the frequency interval includes a first frequency band and a second frequency band, wherein the frequency range values of the first frequency band are both greater than the frequency range value of the second frequency band. If the frequency interval in which the current operating frequency of the compressor is located is judged to be the first frequency band, the operating frequency of the compressor is high at the moment, and therefore a first speed reduction frequency which is relatively large can be selected to carry out fast frequency reduction until the current operating frequency is located in the second frequency band.
And step S14, when the frequency interval where the current operating frequency is located is a second frequency band, controlling the compressor to operate at a corresponding second speed reduction frequency until the lowest operating frequency is reached.
In this embodiment, when the frequency interval in which the current operating frequency of the compressor is located is the second frequency band, it indicates that the operating frequency of the compressor at this time is relatively low, and therefore, a relatively small second speed reduction frequency may be selected to slowly reduce the frequency until the lowest operating frequency is reached. That is, the second speed reduction frequency is smaller than the first speed reduction frequency, so that the stability of the compressor during high-frequency operation is better, and therefore, the speed reduction frequency can be improved to shorten the shutdown time; the stability of the compressor is relatively poor when the compressor operates at low frequency, and particularly for a single-rotor variable frequency compressor, the stability is lower, so that a relatively smaller speed reduction frequency needs to be selected to improve the stability.
In other embodiments, the frequency interval need not be divided, but the corresponding speed reduction frequency is determined directly from the current operating frequency of the compressor. Specifically, the relationship between the speed reduction frequency of the compressor and the current operation frequency may be set to be a positive correlation, that is, the higher the current operation frequency is, the higher the corresponding speed reduction frequency is, and the corresponding relationship may be obtained by calculation or by looking up a table, which is not limited specifically.
In a specific example, as shown in fig. 4, when the inverter air conditioner receives a shutdown signal during normal operation, the operation frequency of the compressor may be reduced by performing a frequency-division variable-reduction frequency (two-division variable-reduction frequency: a first reduction frequency and a second reduction frequency) until the evaporation pressure and the condensation pressure of the compressor are less than the predetermined shutdown differential pressure threshold, and a compressor stop signal is triggered to stop the operation of the compressor.
In the fourth embodiment, referring to fig. 5, on the basis of the second embodiment, the step S1 is further followed by:
step S5, acquiring the running time of the compressor running at the lowest running frequency;
and step S6, controlling the compressor to stop running when the running time reaches a preset running time threshold.
In this embodiment, when the operating frequency of the compressor is reduced to the minimum operating frequency, the operating time of the compressor operating at the minimum operating frequency is acquired in real time or at regular time. If the operation time of the compressor operating at the lowest operation frequency reaches a preset operation time threshold value, such as 60s, it indicates that the corresponding refrigerant pressure at this time has reached the safe range, and therefore the compressor can be controlled to stop operating.
It should be understood that the scheme for controlling the shutdown operation of the compressor when the calculated pressure difference is less than the predetermined shutdown pressure difference threshold value and the scheme for controlling the shutdown operation of the compressor when the running time of the compressor running at the lowest running frequency reaches the preset running time threshold value can be separately executed, that is, the compressor is controlled to stop running as long as any one of the schemes meets the condition; the two schemes can also be combined, namely, the calculated pressure difference is considered, and the time of the compressor running at the lowest running frequency is also considered, for example, when the running time of the compressor running at the lowest running frequency reaches the preset running time threshold while the pressure difference is greater than or equal to the preset shutdown pressure difference threshold, the compressor is controlled to stop running; of course, the other way around, when the running time of the compressor running at the lowest running frequency does not reach the preset running time threshold, if the pressure difference is less than the preset shutdown pressure difference threshold, the compressor is controlled to be shut down.
In a specific example, as shown in fig. 6, when the inverter air conditioner receives a shutdown signal during normal operation, a frequency-division variable-down frequency may be performed to reduce the operating frequency of the compressor (two-division variable-down frequency: a first down-speed frequency and a second down-speed frequency), and a compressor shutdown signal is triggered until the operating time of the compressor operating at the lowest operating frequency reaches a preset operating time threshold (at which the calculated pressure difference is greater than or equal to the preset shutdown pressure difference threshold), so as to stop the operation of the compressor.
In the fifth embodiment, referring to fig. 7, on the basis of the first embodiment, the step S1 is further followed by:
step S7, when the variable frequency air conditioner receives a stop signal, acquiring the frequency reduction time of the compressor for frequency reduction operation;
in this embodiment, when the inverter air conditioner receives the shutdown signal, the down-conversion time during which the compressor is performing the down-conversion operation is obtained in real time or at regular time, where the down-conversion time includes an operation time during which the operation frequency of the compressor is reduced to a predetermined frequency, for example, a minimum operation frequency, and an operation time during which the compressor is operating at the minimum operation frequency.
And step S8, controlling the compressor to stop running when the frequency reduction time reaches a preset frequency reduction time threshold.
In this embodiment, the preset down-conversion time threshold may be set to 90s, and of course, in other embodiments, other reasonable values may be set. When the frequency reduction time of the compressor reaches a preset frequency reduction time threshold, the frequency reduction process is completed and the compressor is in a relatively stable state, so that the compressor can be controlled to stop running.
In a specific example, as shown in fig. 8, when the inverter air conditioner receives a shutdown signal during normal operation, the frequency-dividing-section speed-reducing frequency may be performed to reduce the operating frequency of the compressor (the two-section speed-reducing frequency: a first speed-reducing frequency and a second speed-reducing frequency) until the compressor operates at the lowest operating frequency, during which, the frequency-reducing time of the compressor is obtained in real time or at regular time, and if the frequency-reducing time reaches a preset frequency-reducing time threshold, a compressor stop signal is triggered to stop the operation of the compressor.
In addition, the embodiment of the invention also provides an inverter air conditioner and a computer readable storage medium, wherein the inverter air conditioner comprises a stop control program, and the stop control program is configured to implement the steps of the stop control method of the inverter air conditioner.
The computer readable storage medium stores a shutdown control program of the inverter air conditioner, and the shutdown control program of the inverter air conditioner realizes the following operations when being executed by a processor:
when the variable frequency air conditioner receives a shutdown signal, reducing the running frequency of the compressor until the running frequency reaches a preset frequency;
acquiring the evaporation pressure and the condensation pressure of the compressor, and calculating the difference between the evaporation pressure and the condensation pressure to obtain a pressure difference value;
and when the pressure difference value is smaller than a preset shutdown pressure difference threshold value, controlling the compressor to stop running.
Further, when executed by the processor, the shutdown control program of the inverter air conditioner further implements the following operations:
and when the variable frequency air conditioner receives a stop signal, controlling the compressor to reduce the frequency at a constant speed until the lowest running frequency is reached.
Further, when executed by the processor, the shutdown control program of the inverter air conditioner further implements the following operations:
the method comprises the steps that when the variable frequency air conditioner receives a stop signal, the current running frequency of a compressor is obtained;
judging a frequency interval where the current running frequency is located;
when the frequency interval where the current operating frequency is located is a first frequency band, controlling the compressor to operate at a corresponding first speed reduction frequency;
and when the frequency interval in which the current operating frequency is located is a second frequency band, controlling the compressor to operate at a corresponding second speed reduction frequency until the lowest operating frequency is reached.
Further, when executed by the processor, the shutdown control program of the inverter air conditioner further implements the following operations:
the first frequency range is larger than the second frequency range, and the second speed reduction frequency is smaller than the first speed reduction frequency.
Further, when executed by the processor, the shutdown control program of the inverter air conditioner further implements the following operations:
acquiring the running time of the compressor running at the lowest running frequency;
and controlling the compressor to stop running when the running time reaches a preset running time threshold value.
Further, when executed by the processor, the shutdown control program of the inverter air conditioner further implements the following operations:
when the variable frequency air conditioner receives a stop signal, acquiring the frequency reduction time of the compressor for performing frequency reduction operation;
and when the frequency reduction time reaches a preset frequency reduction time threshold value, controlling the compressor to stop running.
The specific embodiment of the shutdown control program of the inverter air conditioner executed by the processor is described above, and is not described herein again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. The shutdown control method of the variable frequency air conditioner is characterized by comprising the following steps of:
the method comprises the steps that when the variable frequency air conditioner receives a stop signal, the current running frequency of a compressor is obtained;
judging a frequency interval in which the current operating frequency is located, and controlling the compressor to operate at a corresponding first speed reduction frequency until the current operating frequency is located in a second frequency band when the frequency interval in which the current operating frequency is located is a first frequency band; when the frequency interval in which the current operating frequency is located is a second frequency band, controlling the compressor to operate at a corresponding second speed reduction frequency until the lowest operating frequency is reached, wherein the second speed reduction frequency is smaller than the first speed reduction frequency;
acquiring the evaporation pressure and the condensation pressure of the compressor, calculating the difference between the evaporation pressure and the condensation pressure to obtain a pressure difference value, and acquiring the frequency reduction time of the compressor for frequency reduction operation, wherein the frequency reduction time comprises the operation time of reducing the operation frequency of the compressor to the lowest operation frequency and the operation time of operating the compressor at the lowest operation frequency;
and when the pressure difference value is smaller than a preset shutdown pressure difference threshold value and the frequency reduction time reaches a preset frequency reduction time threshold value, judging that the pressure of the refrigerant corresponding to the compressor reaches a safety range, and controlling the compressor to stop running.
2. The shutdown control method of the inverter air conditioner according to claim 1, wherein the first frequency band range is larger than the second frequency band range.
3. The shutdown control method of the inverter air conditioner according to claim 1, further comprising:
acquiring the running time of the compressor running at the lowest running frequency;
and controlling the compressor to stop running when the running time reaches a preset running time threshold value.
4. The variable frequency air conditioner is characterized by comprising:
a shutdown control program configured to implement the steps of the shutdown control method of the inverter air conditioner according to any one of claims 1 to 3.
5. A computer-readable storage medium, wherein the computer-readable storage medium stores thereon a shutdown control program of an inverter air conditioner, the shutdown control program of the inverter air conditioner being executed by a processor to implement the steps of the shutdown control method of the inverter air conditioner according to any one of claims 1 to 3.
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| CN109406042B (en) * | 2018-10-24 | 2021-02-09 | 四川长虹空调有限公司 | Pressure data fitting method for variable frequency air conditioner |
| CN113465098A (en) * | 2021-05-21 | 2021-10-01 | 宁波奥克斯电气股份有限公司 | Control method and device for optimizing shutdown airflow sound of compressor and air conditioner |
| CN114992815A (en) * | 2022-06-20 | 2022-09-02 | 宁波奥克斯电气股份有限公司 | Air conditioner, control method and device thereof and readable storage medium |
| CN115451622B (en) * | 2022-08-23 | 2024-02-23 | 青岛海尔空调电子有限公司 | Method and device for fault detection, drying system and storage medium |
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| JP5881339B2 (en) * | 2011-09-01 | 2016-03-09 | 三菱電機株式会社 | Air conditioner |
| CN104061145A (en) * | 2014-06-16 | 2014-09-24 | 邯郸美的制冷设备有限公司 | Frequency conversion compressor control method and device, as well as frequency conversion dehumidifier and frequency conversion window machine |
| CN105757884A (en) * | 2016-03-02 | 2016-07-13 | 芜湖美智空调设备有限公司 | Control method of air conditioner |
| CN105698453A (en) * | 2016-03-09 | 2016-06-22 | 广东美的制冷设备有限公司 | Frequency conversion air conditioner and stop control method and stop control device for compressor of frequency conversion air conditioner |
| CN106524415B (en) * | 2016-11-18 | 2018-11-02 | 珠海格力电器股份有限公司 | Air conditioning control method, device and air-conditioning |
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