CN116839263A - Shutdown control method of air conditioner and air conditioner - Google Patents

Abstract

The disclosure provides a shutdown control method of an air conditioner and the air conditioner, and relates to the technical field of air conditioners. Comprising the following steps: reducing the operating frequency of the compressor under the condition of receiving a shutdown instruction; reducing the opening of the electronic expansion valve under the condition that the operating frequency is less than or equal to a frequency threshold value and the opening of the electronic expansion valve is greater than an opening threshold value; in the process of reducing the opening of the electronic expansion valve, acquiring pipeline temperature and ambient temperature according to the current working mode; and if the temperature difference between the pipeline temperature and the ambient temperature in the preset time period is less than or equal to the temperature threshold value, closing the compressor. Therefore, after a shutdown instruction is received, the operating frequency of the compressor and the opening degree of the electronic expansion valve are reduced to reduce the pressure and the load of the compressor, and when the pressure and the load are smaller, the compressor is closed, so that the shutdown stress and the shutdown vibration can be reduced, and the service life of a pipeline is prolonged.

Description

Shutdown control method of air conditioner and air conditioner

Technical Field

The disclosure relates to the technical field of air conditioners, and in particular relates to a shutdown control method of an air conditioner and the air conditioner.

Background

When the air conditioner is operated (particularly under high load such as refrigeration, the outdoor environment temperature is high), the pressure of the entire circulation system is large. When the air conditioner is shut down, the compressor needs to stop running, if the air conditioner is shut down directly or is shut down by using a driving angle with smaller vibration of a pipeline under the current running frequency, the problems of large shutdown stress and larger vibration caused by the vibration of the pipeline can be caused, if the air conditioner is shut down in the mode for a long time, the fatigue cracking of the pipeline can be further caused, and finally the pipe is broken.

Disclosure of Invention

The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.

An embodiment of a first aspect of the present disclosure provides a shutdown control method of an air conditioner, including:

reducing the operating frequency of the compressor under the condition of receiving a shutdown instruction;

reducing the opening of the electronic expansion valve under the condition that the operating frequency is smaller than or equal to a frequency threshold value and the opening of the electronic expansion valve is larger than an opening threshold value;

in the process of reducing the opening of the electronic expansion valve, acquiring pipeline temperature and ambient temperature according to the current working mode;

and if the temperature difference between the pipeline temperature and the ambient temperature in the preset time period is less than or equal to a temperature threshold value, closing the compressor.

An embodiment of a second aspect of the present disclosure provides an air conditioner, including: a controller, a compressor, and an electronic expansion valve;

the controller is used for controlling the operation frequency of the compressor to be reduced when a shutdown instruction is received;

the controller is further used for controlling to reduce the opening of the electronic expansion valve under the condition that the operating frequency is smaller than or equal to a frequency threshold value and the opening of the electronic expansion valve is larger than an opening threshold value;

the controller is used for controlling and acquiring pipeline temperature and environment temperature according to the current working mode in the process of reducing the opening of the electronic expansion valve;

the controller is also used for controlling the compressor to be closed under the condition that the temperature difference between the pipeline temperature and the environment temperature in the preset time period is smaller than or equal to a temperature threshold value.

The shutdown control method of the air conditioner and the air conditioner have the following beneficial effects:

in the embodiment of the disclosure, under the condition that a shutdown instruction is received, the operation frequency of the compressor is reduced, and under the condition that the operation frequency is smaller than or equal to a frequency threshold value and the opening of the electronic expansion valve is larger than an opening threshold value, the opening of the electronic expansion valve is reduced; and in the process of reducing the opening of the electronic expansion valve, acquiring the pipeline temperature and the environment temperature according to the current working mode, and closing the compressor if the temperature difference between the pipeline temperature and the environment temperature in the preset time period is smaller than or equal to a temperature threshold value. Therefore, after a shutdown instruction is received, the operating frequency of the compressor and the opening degree of the electronic expansion valve are reduced to reduce the pressure and the load of the compressor, and when the pressure and the load are smaller, the compressor is closed, so that the shutdown stress and the shutdown vibration can be reduced, and the service life of a pipeline is prolonged.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Drawings

The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a flowchart of a shutdown control method of an air conditioner according to an embodiment of the disclosure;

fig. 2 is a flowchart illustrating a shutdown control method of an air conditioner according to another embodiment of the disclosure;

fig. 3 is a flowchart illustrating a shutdown control method of an air conditioner according to another embodiment of the disclosure;

fig. 4 is a flowchart illustrating a shutdown control method of an air conditioner according to another embodiment of the disclosure;

fig. 5 is a schematic structural diagram of an air conditioner according to an embodiment of the present disclosure;

Detailed Description

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.

The shutdown control method of the air conditioner and the air conditioner according to the embodiments of the present disclosure are described below with reference to the accompanying drawings.

Fig. 1 is a flowchart illustrating a shutdown control method of an air conditioner according to an embodiment of the disclosure.

As shown in fig. 1, the shutdown control method of the air conditioner may include the steps of:

step 101, when a shutdown instruction is received, the operation frequency of the compressor is reduced.

The shutdown instruction may be an instruction sent by a remote controller of the air conditioner, where the user shuts down the air conditioner.

Optionally, if the operation frequency of the compressor is greater than the frequency threshold when the shutdown command is received, the operation frequency of the compressor needs to be reduced, so that the pressure of the air conditioner can be reduced, and the air conditioner is in a stable operation state.

The frequency threshold may be any one of 25-45 hertz (Hz), such as 30Hz.

Optionally, if the operating frequency of the compressor is less than or equal to the frequency threshold when the shutdown command is received, the operating frequency of the compressor may not be reduced.

Step 102, reducing the opening degree of the electronic expansion valve under the condition that the operation frequency is smaller than or equal to the frequency threshold value and the opening degree of the electronic expansion valve is larger than the opening degree threshold value.

It should be noted that, in the process of reducing the frequency of the compressor, if the operating frequency of the compressor is greater than the frequency threshold, the frequency reduction rate of the compressor is faster, such as 1Hz/s, 2Hz/s, etc., and when the operating frequency of the compressor is less than the frequency threshold, the stability of the compressor is poor, and the frequency reduction rate of the compressor is reduced, such as 0.2Hz/s, 0.5Hz/s, etc.

Therefore, in order to avoid that the time for reducing the compressor is too long, the shut-down time or the shut-down time of loads such as an outer fan, an inner fan, an air deflector and the like is too long, and further the shut-down time is prolonged, in the embodiment of the present disclosure, the operation frequency is not continuously reduced under the condition that the operation frequency is less than or equal to the frequency threshold value, and the opening degree of the electronic expansion valve is further adjusted.

And when the opening of the electronic expansion valve is larger than the opening threshold, reducing the opening of the electronic expansion valve, so that the air conditioner is in a stable state.

The opening threshold may be preset, for example, the opening threshold may be any one of values 80P to 110P. The present disclosure is not limited in this regard.

Alternatively, the opening threshold may be determined according to the type of air conditioner. I.e. different air conditioning types, have different opening thresholds.

For example, if the type of air conditioner is a central air conditioning system, the control requirement for the electronic expansion valve is high due to the large scale. Therefore, the central air conditioning system is generally required to have a smaller minimum opening degree to achieve finer temperature control.

If the type of the air conditioner is a household split air conditioner, the household split air conditioning system is mainly used for cooling a single room or a small space, the scale is small, and the minimum opening requirement on the electronic expansion valve is flexible, so that the minimum opening may be relatively high.

Optionally, the opening of the electronic expansion valve is reduced based on a preset rate of decrease.

The preset decreasing rate may also be referred to as an exciting speed, for example, the exciting speed is 32ms (milliseconds)/P (steps), which means that the electronic expansion valve decreases the opening of the electronic expansion valve at a rate of 1 step every 32 ms.

Step 103, obtaining the pipeline temperature and the environment temperature according to the current working mode in the process of reducing the opening of the electronic expansion valve.

It should be noted that the temperature difference between the pipeline temperature and the ambient temperature may indicate whether the air conditioner is currently in a steady state. Therefore, in the process of reducing the opening of the electronic expansion valve, the pipeline temperature and the environment temperature are acquired, and whether the air conditioner is stable currently is further determined according to the temperature difference between the pipeline temperature and the environment temperature.

It should be noted that, the operation modes of the air conditioner are different, and the positions of the temperatures reflecting the steady state of the air conditioner are also different.

Optionally, in the case that the operation mode is the cooling mode, the line temperature is a condenser line temperature, and the ambient temperature is an outdoor ambient temperature.

Or when the operation mode is a heating mode, the line temperature is an evaporator line temperature, and the ambient temperature is an indoor ambient temperature.

And 104, if the temperature difference between the pipeline temperature and the ambient temperature in the preset time period is less than or equal to the temperature threshold value, closing the compressor.

The preset duration may be a preset duration. For example, the preset duration may be 5s, 3s, etc., which is not limited in this disclosure.

The temperature difference between the pipeline temperature and the environment temperature can be the difference between the pipeline temperature and the larger temperature and the smaller temperature in the environment temperature.

For example, if the temperature of the pipeline is greater than the ambient temperature, the temperature difference is the pipeline temperature minus the ambient temperature. And if the pipeline temperature is less than the ambient temperature, the temperature difference is the ambient temperature minus the pipeline temperature.

The temperature threshold may be 3 degrees celsius, 2 degrees celsius, etc., which is not limited by the present disclosure.

When the temperature difference between the temperature of the inner pipeline and the ambient temperature is smaller than or equal to the temperature threshold value in the preset time period, the system is relatively stable because the pressure of the whole system is lower and the load of the compressor is smaller, and the compressor is turned off at the moment, so that the problem of high shutdown stress caused by large pipeline swing due to direct turn-off of the compressor in the high load can be avoided.

In the embodiment of the disclosure, under the condition that a shutdown instruction is received, the operation frequency of the compressor is reduced, and under the condition that the operation frequency is smaller than or equal to a frequency threshold value and the opening of the electronic expansion valve is larger than an opening threshold value, the opening of the electronic expansion valve is reduced; and in the process of reducing the opening of the electronic expansion valve, acquiring the pipeline temperature and the environment temperature according to the current working mode, and closing the compressor if the temperature difference between the pipeline temperature and the environment temperature in the preset time period is smaller than or equal to a temperature threshold value. Therefore, after a shutdown instruction is received, the operating frequency of the compressor and the opening degree of the electronic expansion valve are reduced to reduce the pressure and the load of the compressor, and when the pressure and the load are smaller, the compressor is closed, so that the shutdown stress and the shutdown vibration can be reduced, and the service life of a pipeline is prolonged.

Fig. 2 is a flowchart of a shutdown control method of an air conditioner according to an embodiment of the disclosure, as shown in fig. 2, the shutdown control method of an air conditioner may include the following steps:

in step 201, if the operation frequency of the compressor is greater than the frequency threshold value under the condition that the shutdown command is received, the operation frequency of the compressor is controlled to be reduced to the frequency threshold value based on the target frequency reduction rate.

Alternatively, the frequency threshold may be preset. Alternatively, it may be obtained by:

firstly, acquiring the shutdown time of an air conditioner load, a preset first frequency threshold value and the initial operation frequency of a compressor, then determining a second frequency threshold value according to the target frequency-reducing rate, the initial operation frequency and the shutdown time, and finally determining the maximum value of the first frequency threshold value and the second frequency threshold value as the frequency threshold value.

The initial operating frequency is the operating frequency of the compressor when a shutdown instruction is received.

In the above manner, the target rate is a fixed value, for example, the target rate may be 2Hz/s.

The shutdown time may be a preset duration of time for which the air conditioner load is expected to be shutdown after receiving the shutdown instruction. For example, the shutdown time may be 30s.

The first frequency threshold may be a preset frequency threshold of the desired compressor lowered to the first frequency threshold, so as to adjust the frequency of the electronic expansion valve. For example, the first frequency threshold may be 30Hz.

After determining the target frequency-reducing rate, the initial operating frequency and the shutdown time, the compressor can be determined to reduce the operating frequency at the target frequency-reducing rate within the shutdown time, and then the difference between the initial operating frequency and the value can be determined as the second frequency threshold. I.e., the compressor may be reduced to a second frequency threshold during shutdown time by reducing the operating frequency at the target frequency reduction rate.

If the second frequency threshold is greater than the first frequency threshold, the second frequency threshold can be determined to be the final frequency threshold, and the condition that the operation frequency is reduced due to overlong time length when the operation frequency is reduced continuously to the first frequency threshold is avoided, so that the load shutdown time length is delayed.

However, if the second frequency threshold is smaller than the first frequency threshold, the first frequency threshold may be determined as a final frequency threshold, so as to further ensure the stability of the system.

For example, if the first frequency threshold may be 30Hz, the shutdown period may be 20s, the initial operating frequency may be 80Hz, the target down rate may be 2Hz/s, then within 20s, the operating frequency may be reduced to 40Hz, and the second frequency threshold may be 80Hz-40 hz=40 Hz >30Hz, thus determining that the final frequency threshold is 40Hz.

Alternatively, the target down rate may be preset. Alternatively, it may be determined by:

the method comprises the steps of firstly obtaining the shutdown time of an air conditioner load, a preset first frequency reduction rate and the initial operation frequency of a compressor, and then determining a second frequency reduction rate according to the initial operation frequency, a frequency threshold value and the shutdown time. And finally, determining the maximum value of the first frequency-reducing rate and the second frequency-reducing rate as a target frequency-reducing rate.

The initial operating frequency is the operating frequency of the compressor when a shutdown instruction is received.

In the above manner, the frequency threshold is a fixed value. For example, the frequency threshold may be 30Hz.

The first frequency-reducing rate may be a preset rate at which the operating frequency of the desired compressor is reduced. For example, the first down-conversion rate may be 2Hz/s.

After the initial operating frequency, the frequency threshold and the shutdown time are obtained, a difference value between the initial operating frequency and the frequency threshold can be determined first, and then a ratio of the difference value and the shutdown time is determined as a second down rate.

It should be noted that, if the second down-conversion rate is greater than the first down-conversion rate, the second down-conversion rate may be determined to be the target down-conversion rate. The method avoids the situation that the operation frequency is reduced to the frequency threshold value at the first frequency reduction rate, so that the time length for reducing the operation frequency is too long, and further the delay of the load shutdown time length is caused.

If the second frequency-reducing rate is smaller than the first frequency-reducing rate, the first frequency-reducing rate can be determined to be the target frequency-reducing rate, so that the running frequency can be stably changed in the process of reducing the running frequency, and the stability of the system is ensured.

Step 202, reducing the opening degree of the electronic expansion valve under the condition that the operation frequency is less than or equal to the frequency threshold value and the opening degree of the electronic expansion valve is greater than the opening degree threshold value.

Step 203, in the process of reducing the opening of the electronic expansion valve, acquiring the pipeline temperature and the ambient temperature according to the current working mode.

The specific implementation manner of step 202 and step 203 may refer to the detailed description of other embodiments of the present disclosure, which is not described in detail herein.

And 204, if the temperature difference between the pipeline temperature and the ambient temperature in the preset time period is smaller than or equal to the temperature threshold value, acquiring the minimum load torque corresponding to the compressor.

Step 205, when the compressor is running to a minimum load torque, the compressor is turned off.

The minimum load torque may be a torque angle at which a load is minimum during operation of the compressor motor rotor.

In the embodiment of the disclosure, after determining that the temperature difference between the pipeline temperature and the ambient temperature within the preset time period is less than or equal to the temperature threshold, the minimum load torque corresponding to the compressor can be further determined, and when the compressor is operated to the minimum load torque, the compressor is closed, so that the load when the compressor is closed and the pressure of the system can be further reduced.

In the embodiment of the disclosure, if the operating frequency of the compressor is greater than a frequency threshold value under the condition that a shutdown instruction is received, controlling the operating frequency of the compressor to be reduced to the frequency threshold value based on a target frequency reduction rate, reducing the opening of the electronic expansion valve under the condition that the operating frequency is less than or equal to the frequency threshold value and the opening of the electronic expansion valve is greater than an opening threshold value, acquiring pipeline temperature and ambient temperature according to a current working mode in the process of reducing the opening of the electronic expansion valve, acquiring a minimum load torque corresponding to the compressor if the temperature difference between the pipeline temperature and the ambient temperature within a preset time period is less than or equal to the temperature threshold value, and finally closing the compressor when the compressor is operated to the minimum load torque. Therefore, after a shutdown instruction is received, the compressor is closed by reducing the operation frequency of the compressor and the opening of the electronic expansion valve and when the compressor is operated to the minimum load torque, so that the pressure and the load of the compressor during shutdown can be further reduced, the shutdown stress and the shutdown vibration can be further reduced, and the service life of a pipeline is prolonged.

Fig. 3 is a flowchart of a shutdown control method of an air conditioner according to an embodiment of the disclosure, as shown in fig. 3, the shutdown control method of an air conditioner may include the following steps:

step 301, when a shutdown command is received, reducing the operation frequency of the compressor.

Step 302, reducing the opening degree of the electronic expansion valve when the operation frequency is less than or equal to the frequency threshold value and the opening degree of the electronic expansion valve is greater than the opening degree threshold value.

Step 303, obtaining the pipeline temperature and the environment temperature according to the current working mode in the process of reducing the opening of the electronic expansion valve.

The specific implementation manner of step 301 and step 303 may refer to the detailed description of other embodiments of the present disclosure, which is not described herein in detail.

And step 304, closing the compressor when the opening of the electronic expansion valve is reduced to an opening threshold value and the temperature difference between the pipeline temperature and the environment temperature in the preset time period is greater than the temperature threshold value.

It should be noted that, when the opening degree of the electronic expansion valve is equal to the opening degree threshold value, the system is relatively stable. Therefore, during the shutdown of the air conditioner, the compressor needs to be turned off as long as the opening degree of the electronic expansion valve is equal to the opening degree threshold value.

Therefore, if the opening of the electronic expansion valve is reduced to the opening threshold value and the temperature difference between the pipeline temperature and the environment temperature in the preset time period is larger than the temperature threshold value, the compressor is immediately closed.

For example, when the opening of the electronic expansion valve is reduced to the opening threshold value, the preset time period is 5 seconds, and the temperature difference between the pipeline temperature and the ambient temperature is less than or equal to the temperature threshold value only for 3 seconds, and the compressor needs to be turned off.

In the embodiment of the disclosure, under the condition that a shutdown instruction is received, the operating frequency of the compressor is reduced, under the condition that the operating frequency is smaller than or equal to a frequency threshold value and the opening of the electronic expansion valve is larger than an opening threshold value, the opening of the electronic expansion valve is reduced, and in the process of reducing the opening of the electronic expansion valve, the pipeline temperature and the environment temperature are obtained according to the current working mode; and finally, closing the compressor under the condition that the opening of the electronic expansion valve is reduced to an opening threshold value and the temperature difference between the pipeline temperature and the environment temperature in the preset time period is larger than the temperature threshold value. Therefore, when the opening degree of the electronic expansion valve is determined to be reduced to the opening degree threshold value, the compressor can be turned off, the temperature difference between the pipeline temperature and the ambient temperature within a preset period is not required to be larger than the temperature threshold value, so that the period for turning off the compressor can be shortened, the pressure and the load of the compressor during the shutdown are reduced, and the shutdown time can be shortened while the shutdown stress and the shutdown vibration are reduced.

Fig. 4 is a flowchart of a shutdown control method of an air conditioner according to an embodiment of the disclosure, as shown in fig. 4, the shutdown control method of an air conditioner may include the following steps:

step 401, obtaining an operation frequency of a compressor when a shutdown instruction is received.

Step 402, judging whether the operation frequency of the compressor is greater than a frequency threshold, and executing step 403 if the operation frequency is greater than the frequency threshold; in the event that the operating frequency is less than or equal to the frequency threshold, step 404 is performed.

Step 403, reducing the operating frequency of the compressor to a frequency threshold.

Step 404, obtaining the opening degree of the electronic expansion valve.

Step 405, determining whether the opening degree of the electronic expansion valve is greater than an opening degree threshold, if the opening degree is greater than the opening degree threshold, executing step 406, and if the opening degree is equal to the opening degree threshold, executing step 410.

Step 406, reducing the opening of the electronic expansion valve.

Step 407, obtaining the pipeline temperature and the ambient temperature according to the current working mode in the process of reducing the opening of the electronic expansion valve.

Step 408, if the temperature difference between the pipeline temperature and the ambient temperature in the preset time period is less than or equal to the temperature threshold, step 410 is performed.

Step 409, executing step 410 when the opening of the electronic expansion valve is reduced to the opening threshold, and the temperature difference between the pipeline temperature and the ambient temperature within the preset time period is greater than the temperature threshold.

At step 410, the compressor is shut down when the compressor is running to a minimum load torque.

In order to achieve the above embodiments, the present disclosure further provides a shutdown control device of an air conditioner.

Fig. 5 is a schematic structural diagram of an air conditioner according to an embodiment of the present disclosure.

As shown in fig. 5, the air conditioner 500 may include: an embodiment of a second aspect of the present disclosure provides an air conditioner, including: a controller 501, a compressor 502, and an electronic expansion valve 503;

the controller 501 is configured to control to reduce the operating frequency of the compressor 502 when a shutdown instruction is received;

the controller 501 is further configured to control to reduce the opening of the electronic expansion valve 503 when the operating frequency is less than or equal to a frequency threshold and the opening of the electronic expansion valve is greater than an opening threshold;

the controller 501 is configured to control to obtain a pipeline temperature and an ambient temperature according to a current working mode during a process of reducing an opening of the electronic expansion valve 503;

the controller 501 is further configured to control the compressor 502 to be turned off when a temperature difference between the internal pipe temperature and the ambient temperature is less than or equal to a temperature threshold value for a preset period of time.

Optionally, when the working mode is a refrigeration mode, the pipeline temperature is a condenser pipeline temperature, and the ambient temperature is an outdoor ambient temperature; or,

under the condition that the working mode is a heating mode, the pipeline temperature is the evaporator pipeline temperature, and the environment temperature is the indoor environment temperature.

Optionally, the controller 501 is specifically configured to:

and if the operating frequency of the compressor is greater than the frequency threshold, controlling the operating frequency of the compressor to be reduced to the frequency threshold based on the target frequency reduction rate.

Optionally, the controller 501 is specifically configured to:

acquiring the shutdown time of an air conditioner load, a preset first frequency threshold value and the initial operating frequency of the compressor, wherein the initial operating frequency is the operating frequency of the compressor when a shutdown instruction is received;

determining a second frequency threshold according to the target frequency-reducing rate, the initial operating frequency and the shutdown time;

the maximum value of the first frequency threshold and the second frequency threshold is determined as the frequency threshold.

Optionally, the controller 501 is specifically configured to:

acquiring the shutdown time of an air conditioner load, a preset first frequency reduction rate and the initial operating frequency of a compressor, wherein the initial operating frequency is the operating frequency of the compressor when a shutdown instruction is received;

determining a second frequency-reducing rate according to the initial operating frequency, the frequency threshold value and the shutdown time;

and determining the maximum value of the first frequency-reducing rate and the second frequency-reducing rate as a target frequency-reducing rate.

Optionally, the controller 501 is specifically configured to:

obtaining the minimum load torque corresponding to the compressor;

the compressor is controlled to shut down when the compressor is running to a minimum load torque.

Optionally, the controller 501 is specifically configured to:

and under the condition that the opening of the electronic expansion valve is reduced to an opening threshold value and the temperature difference between the pipeline temperature and the environment temperature in the preset time period is larger than the temperature threshold value, controlling to close the compressor.

Optionally, the controller 501 is further configured to:

and determining an opening threshold according to the type of the air conditioner.

Optionally, the controller 501 is further configured to:

and controlling to reduce the opening of the electronic expansion valve based on the preset reduction rate.

The functions and specific implementation principles of the foregoing modules in the embodiments of the present disclosure may refer to the foregoing method embodiments, and are not repeated herein.

The air conditioner of the embodiment of the disclosure firstly reduces the operation frequency of a compressor under the condition that a shutdown instruction is received, and reduces the opening of an electronic expansion valve under the condition that the operation frequency is smaller than or equal to a frequency threshold value and the opening of the electronic expansion valve is larger than an opening threshold value; and in the process of reducing the opening of the electronic expansion valve, acquiring the pipeline temperature and the environment temperature according to the current working mode, and closing the compressor if the temperature difference between the pipeline temperature and the environment temperature in the preset time period is smaller than or equal to a temperature threshold value. Therefore, after a shutdown instruction is received, the operating frequency of the compressor and the opening degree of the electronic expansion valve are reduced to reduce the pressure and the load of the compressor, and when the pressure and the load are smaller, the compressor is closed, so that the shutdown stress and the shutdown vibration can be reduced, and the service life of a pipeline is prolonged.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present disclosure. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise.

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 specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present disclosure 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 embodiments of the present disclosure.

Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing 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). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may 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 disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.

Furthermore, each functional unit in the embodiments of the present disclosure may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.

Claims (10)

1. A shutdown control method of an air conditioner, comprising:

reducing the operating frequency of the compressor under the condition of receiving a shutdown instruction;

reducing the opening of the electronic expansion valve under the condition that the operating frequency is smaller than or equal to a frequency threshold value and the opening of the electronic expansion valve is larger than an opening threshold value;

in the process of reducing the opening of the electronic expansion valve, acquiring pipeline temperature and ambient temperature according to the current working mode;

and if the temperature difference between the pipeline temperature and the ambient temperature in the preset time period is less than or equal to a temperature threshold value, closing the compressor.

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

when the working mode is a refrigeration mode, the pipeline temperature is the pipeline temperature of the condenser, and the ambient temperature is the outdoor ambient temperature; or,

and under the condition that the working mode is a heating mode, the pipeline temperature is the pipeline temperature of the evaporator, and the environment temperature is the indoor environment temperature.

3. The method of claim 1, wherein said reducing the operating frequency of the compressor comprises:

and if the operating frequency of the compressor is greater than the frequency threshold, controlling the operating frequency of the compressor to be reduced to the frequency threshold based on the target frequency-reducing rate.

4. A method according to claim 3, further comprising:

acquiring the shutdown time of an air conditioner load, a preset first frequency threshold value and the initial operating frequency of the compressor, wherein the initial operating frequency is the operating frequency of the compressor when a shutdown instruction is received;

determining a second frequency threshold according to the target frequency-reducing rate, the initial operating frequency and the shutdown time;

and determining the maximum value of the first frequency threshold value and the second frequency threshold value as the frequency threshold value.

5. A method according to claim 3, further comprising:

acquiring the shutdown time of an air conditioner load, a preset first frequency reduction rate and the initial operating frequency of the compressor, wherein the initial operating frequency is the operating frequency of the compressor when a shutdown instruction is received;

determining a second frequency-reducing rate according to the initial operating frequency, the frequency threshold value and the shutdown time;

and determining the maximum value of the first frequency-reducing rate and the second frequency-reducing rate as the target frequency-reducing rate.

6. The method of claim 1, wherein said shutting down said compressor comprises:

acquiring the minimum load torque corresponding to the compressor;

the compressor is shut down when the compressor is running to a minimum load torque.

7. The method as recited in claim 1, further comprising:

and closing the compressor under the condition that the opening of the electronic expansion valve is reduced to the opening threshold value and the temperature difference between the pipeline temperature and the environment temperature in the preset time period is larger than the temperature threshold value.

8. The method of any one of claims 1-7, further comprising:

and determining the opening threshold according to the type of the air conditioner.

9. The method of any of claims 1-7, wherein reducing the opening of the electronic expansion valve comprises:

and reducing the opening of the electronic expansion valve based on a preset reduction rate.

10. An air conditioner, comprising: a controller, a compressor, and an electronic expansion valve;

the controller is used for controlling the operation frequency of the compressor to be reduced when a shutdown instruction is received;

the controller is further used for controlling to reduce the opening of the electronic expansion valve under the condition that the operating frequency is smaller than or equal to a frequency threshold value and the opening of the electronic expansion valve is larger than an opening threshold value;

the controller is used for controlling and acquiring pipeline temperature and environment temperature according to the current working mode in the process of reducing the opening of the electronic expansion valve;

the controller is also used for controlling the compressor to be closed under the condition that the temperature difference between the pipeline temperature and the environment temperature in the preset time period is smaller than or equal to a temperature threshold value.