WO2018201625A1 - Variable-frequency air conditioner, shutdown control method, and computer readable storage medium - Google Patents

Abstract

A shutdown control method for a variable-frequency air conditioner, comprising the following steps: when a variable-frequency air conditioner receives a shutdown signal, reducing the operating frequency of a compressor until a predetermined frequency is reached; acquiring the load power of the variable-frequency air conditioner; and when the load power is less than a predetermined shutdown power threshold, controlling the compressor to stop operating. Also disclosed are the variable-frequency air conditioner and a computer readable storage medium.

Description

 Inverter air conditioner, shutdown control method and computer readable storage medium

Technical field

The invention relates to the technical field of air conditioners, in particular to an inverter air conditioner, a shutdown control method and a computer readable storage medium.

Background technique

In the inverter air conditioner system, the refrigerant pressure is high during high-frequency operation. At this time, the pipeline has been deformed. If the compressor is stopped directly, the refrigerant will stop flowing rapidly, and the refrigerant pressure will suddenly drop, causing the pipeline deformation to rebound immediately. With the oscillation, the vibration and stress of the piping of the compressor are excessive, and there is even a danger of the pipe being broken. Therefore, how to reduce the vibration and stress of the piping of the compressor of the inverter air conditioner at the time of shutdown becomes an urgent problem to be solved.

Summary of the invention

The main object of the present invention is to provide an inverter air conditioner, a shutdown control method and a computer readable storage medium, aiming at reducing the vibration and stress of the piping of the inverter of the inverter air conditioner, prolonging the service life of the pipeline, and improving the system stability of the inverter air conditioner. .

In order to achieve the above object, a shutdown control method for an inverter air conditioner according to the present invention includes the following steps:

The inverter air conditioner reduces the operating frequency of the compressor until a predetermined frequency is reached when receiving the shutdown signal;

Obtaining a load power of the inverter air conditioner;

The compressor is controlled to stop running when the load power is less than a predetermined shutdown power threshold.

Preferably, the step of reducing the operating frequency of the compressor when the inverter air conditioner receives the stop signal further comprises:

The inverter air conditioner controls the compressor to down-convert at a constant rate when receiving the shutdown signal until the minimum operating frequency is reached.

Preferably, the step of reducing the operating frequency of the compressor when the inverter air conditioner receives the stop signal further comprises:

The inverter air conditioner acquires a current operating frequency of the compressor when receiving a shutdown signal;

Determining a frequency interval in which the current operating frequency is located;

Controlling the compressor to operate at a corresponding first deceleration frequency when the frequency range in which the current operating frequency is in the first frequency band;

When the frequency range in which the current operating frequency is in the second frequency band, the compressor is controlled to operate at a corresponding second decreasing frequency until the minimum operating frequency is reached.

Preferably, the first frequency band range is greater than the second frequency band range, and the second frequency reduction frequency is smaller than the first frequency reduction frequency.

Preferably, the shutdown control method of the inverter air conditioner further includes:

Obtaining an operating time of the compressor operating at the lowest operating frequency;

The compressor is stopped from operating when the runtime reaches a preset operating time threshold.

Preferably, the shutdown control method of the inverter air conditioner further includes:

When receiving the shutdown signal, the inverter air conditioner obtains a frequency reduction time of the compressor for performing a frequency reduction operation;

When the down time reaches the preset down time threshold, the compressor is controlled to stop running.

Preferably, the load power of the inverter air conditioner is one of a compressor power, an outdoor unit power of the inverter air conditioner, or a whole machine power of the inverter air conditioner.

Preferably, the predetermined shutdown power thresholds corresponding to the compressor power, the outdoor unit power, and the whole machine power are a first shutdown power threshold, a second shutdown power threshold, and a third shutdown power threshold, respectively, and the size relationship is: The second shutdown power threshold is less than the third shutdown power threshold and greater than the first shutdown power threshold.

Preferably, the step of acquiring the load power of the inverter air conditioner comprises:

Obtaining a DC bus voltage and a DC bus current of the compressor;

Calculating the product of the DC bus voltage and the DC bus current to obtain the load power of the inverter air conditioner.

Preferably, the step of acquiring the load power of the inverter air conditioner comprises:

Obtaining a speed and a load torque of the compressor;

The product of the rotational speed of the compressor and the load torque is calculated to obtain the load power of the inverter air conditioner.

Preferably, the step of acquiring the load power of the inverter air conditioner comprises:

Obtaining a direct shaft voltage, a direct shaft current, a cross shaft voltage, and a cross shaft current of the compressor;

Calculating a product of a straight-axis voltage of the compressor and the direct-axis current, a product of the cross-axis voltage and the cross-axis current, and taking a sum value to obtain a load power of the inverter air conditioner.

Preferably, the step of acquiring the load power of the inverter air conditioner comprises:

Obtaining a three-phase driving voltage and a three-phase driving current of the compressor;

Calculating a product of each phase driving voltage of the compressor and a driving current, and taking a sum value to obtain a load power of the inverter air conditioner.

Preferably, the step of acquiring the load power of the inverter air conditioner comprises:

Obtaining an AC side instantaneous voltage and an AC side instantaneous current of the outdoor unit of the inverter air conditioner;

Calculating a product of the AC side instantaneous voltage and the AC side instantaneous current to obtain a load power of the inverter air conditioner.

Preferably, the step of acquiring the load power of the inverter air conditioner comprises:

Obtaining a DC side instantaneous voltage and a DC side instantaneous current of the outdoor unit of the inverter air conditioner;

Calculating a product of the DC side instantaneous voltage and the DC side instantaneous current to obtain a load power of the inverter air conditioner.

Preferably, the step of acquiring the load power of the inverter air conditioner comprises:

Obtaining the instantaneous voltage of the AC side of the inverter air conditioner and the instantaneous current of the AC side of the whole machine;

Calculating the product of the instantaneous voltage on the AC side of the whole machine and the instantaneous current on the AC side of the whole machine to obtain the load power of the inverter air conditioner.

Preferably, the manner of reducing the operating frequency of the compressor comprises: controlling the compressor to down-convert at a constant rate until a predetermined frequency is reached; or controlling the compressor to down-convert at a varying rate until a predetermined frequency is reached.

Preferably, the predetermined frequency is a lowest operating frequency of the compressor.

To achieve the above object, the present invention also provides an inverter air conditioner, the inverter air conditioner comprising:

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, wherein the computer readable storage medium stores a shutdown control program of an inverter air conditioner, and the shutdown control program of the inverter air conditioner is executed by the processor to implement the above. The steps of the shutdown control method of the inverter air conditioner.

The inverter air conditioner, the shutdown control method and the computer readable storage medium provided by the invention reduce the operating frequency of the compressor until a predetermined frequency is reached when the inverter air conditioner receives the shutdown signal, and then acquire the load power of the inverter air conditioner. And controlling the compressor to stop running when the load power is less than a predetermined shutdown power threshold. In this way, by reducing the operating frequency of the compressor to a predetermined frequency and controlling the compressor to stop when the load power is less than the predetermined shutdown power threshold, the piping vibration and stress of the compressor of the inverter air conditioner can be reduced, and the service life of the piping can be prolonged. Thereby improving the system stability of the inverter air conditioner.

DRAWINGS

1 is a schematic structural diagram of an inverter air conditioner in a hardware operating environment according to an embodiment of the present invention;

2 is a schematic flow chart of an embodiment of a shutdown control method for an inverter air conditioner according to the present invention;

3 is a schematic diagram of a circuit topology of an outdoor unit of an inverter air conditioner according to the present invention;

4 is a schematic diagram showing the refinement flow of reducing the operating frequency of the compressor until the predetermined frequency is reached when the step frequency air conditioner of FIG. 1 receives the stop signal;

5 is a schematic diagram of determining, according to a relationship between a load power and a predetermined shutdown power threshold, whether to control a compressor shutdown according to the variable frequency air conditioner of the present invention;

6 is a schematic flow chart of another embodiment of a shutdown control method for an inverter air conditioner according to the present invention;

7 is a schematic diagram of determining whether to control the compressor to stop according to the relationship between the running time of the inverter air conditioner running at a predetermined frequency and the preset time threshold according to the present invention;

8 is a schematic flow chart of still another embodiment of a shutdown control method for an inverter air conditioner according to the present invention;

FIG. 9 is a schematic diagram showing the relationship between the frequency reduction time of the inverter air conditioner according to the frequency reduction operation of the compressor and the preset frequency reduction time threshold, and determining whether to control the compressor shutdown.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The inverter air conditioner of the present invention, as shown in FIG. 1, includes a processor 1001, such as a CPU, a user interface 1002, a memory 1003, and a communication bus 1004. Among them, the communication bus 1004 is used to implement connection communication between these components. The user interface 1002 can include a display, an input unit such as a remote control. The memory 1003 may be a high speed RAM memory or a stable memory (non-volatile) Memory), such as disk storage. The memory 1003 can also optionally be a storage device independent of the aforementioned processor 1001.

The inverter air conditioner may further include an indoor unit, an outdoor unit, a compressor provided in the outdoor unit, and various sensors for detecting parameters such as temperature, pressure, humidity, and refrigerant flow rate.

Those skilled in the art will appreciate that the variable frequency air conditioning structure illustrated in Figure 1 does not constitute a limitation to an inverter air conditioner, and may include more or fewer components than those illustrated, or some components may be combined, or different component arrangements.

As shown in FIG. 1, the memory 1003 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a shutdown control program of the inverter air conditioner.

In the inverter air conditioner shown in FIG. 1, the user interface 1002 is mainly used for receiving a user to trigger a user instruction by inputting an instruction on the display screen or inputting an input unit, such as cooling or heating, etc.; the processor 1001 is configured to call the storage in the memory 1003. Stop the control program and do the following:

The inverter air conditioner reduces the operating frequency of the compressor until a predetermined frequency is reached when receiving the shutdown signal;

Obtaining a load power of the inverter air conditioner;

The compressor is controlled to stop running when the load power is less than a predetermined shutdown power threshold.

Further, the processor 1001 can call the shutdown control program stored in the memory 1003, and also performs the following operations:

The inverter air conditioner controls the compressor to down-convert at a constant rate when receiving the shutdown signal until the minimum operating frequency is reached.

Further, the processor 1001 can call the shutdown control program stored in the memory 1003, and also performs the following operations:

The inverter air conditioner acquires a current operating frequency of the compressor when receiving a shutdown signal;

Determining a frequency interval in which the current operating frequency is located;

Controlling the compressor to operate at a corresponding first deceleration frequency when the frequency range in which the current operating frequency is in the first frequency band;

When the frequency range in which the current operating frequency is in the second frequency band, the compressor is controlled to operate at a corresponding second decreasing frequency until the minimum operating frequency is reached.

Further, the processor 1001 can call the shutdown control program stored in the memory 1003, and also performs the following operations:

The first frequency range is greater than the second frequency range, and the second frequency reduction frequency is smaller than the first frequency reduction frequency.

Further, the processor 1001 can call the shutdown control program stored in the memory 1003, and also performs the following operations:

Obtaining an operating time of the compressor operating at the lowest operating frequency;

The compressor is stopped from operating when the runtime reaches a preset operating time threshold.

Further, the processor 1001 can call the shutdown control program stored in the memory 1003, and also performs the following operations:

When receiving the shutdown signal, the inverter air conditioner obtains a frequency reduction time of the compressor for performing a frequency reduction operation;

When the down time reaches the preset down time threshold, the compressor is controlled to stop running.

Further, the processor 1001 can call the shutdown control program stored in the memory 1003, and also performs the following operations:

The load power of the inverter air conditioner is one of a compressor power, an outdoor unit power of the inverter air conditioner, or a whole machine power of the inverter air conditioner.

Further, the processor 1001 can call the shutdown control program stored in the memory 1003, and also performs the following operations:

The predetermined shutdown power thresholds corresponding to the compressor power, the outdoor unit power, and the whole machine power are a first shutdown power threshold, a second shutdown power threshold, and a third shutdown power threshold, respectively, and the magnitude relationship is: the second shutdown power The threshold is less than the third shutdown power threshold and greater than the first shutdown power threshold.

Referring to FIG. 2, in the first embodiment, the present invention provides a shutdown control method for an inverter air conditioner, including:

Step S1, when receiving the shutdown signal, the inverter air conditioner reduces the operating frequency of the compressor until a predetermined frequency is reached;

In this embodiment, the case where the inverter air conditioner receives the shutdown signal mainly includes a shutdown signal triggered by the user through the remote controller or the operation panel. Since the air conditioning system of the present invention mainly relates to an inverter air conditioner, the operating frequency of the compressor can be dynamically changed, and in the embodiment of the present invention, the compressor for the high frequency operation is mainly high when receiving the shutdown signal. The operating frequency of the frequency-operated compressor is adjusted and operated to avoid direct shutdown of the compressor and prevent the piping of the compressor from being broken.

In this embodiment, the manner of reducing the operating frequency of the compressor may include various types, such as controlling the compressor to down-convert at a constant rate until a predetermined frequency is reached; or controlling the compressor to down-convert at a varying rate until a predetermined frequency is reached, specifically It can be downscaled at a larger rate and then downconverted at a lower rate until a predetermined frequency is reached. In addition, the running time of frequency reduction at different rates can be reasonably set according to actual needs.

In this embodiment, the predetermined frequency is preferably set to the lowest operating frequency of the compressor of the corresponding model of the inverter air conditioner. Of course, in other embodiments, other frequencies may be used. For example, the predetermined frequency may be selected according to actual needs. A certain frequency value between the highest operating frequency and the highest operating frequency.

Step S2: acquiring load power of the inverter air conditioner;

In this embodiment, the inverter air conditioner includes an indoor unit and an outdoor unit, wherein the indoor unit controls the indoor fan, the air guiding strip, the display panel, etc. through the indoor electric control, and the outdoor unit controls the outdoor fan and the compressor through the outdoor electric control. Wait. The whole machine power of the inverter air conditioner includes indoor unit power and outdoor unit power, and the outdoor unit power includes compressor power and outdoor fan power, wherein the compressor power is the most important part of the whole machine power, and accounts for the rated operating state. More than 90% of the power of the whole machine.

The load power can be used in various characterization manners. For example, the load power of the inverter air conditioner can be one of compressor power, outdoor unit power, or whole machine power. The predetermined shutdown power thresholds corresponding to the compressor power, the outdoor unit power, and the whole machine power are a first shutdown power threshold, a second shutdown power threshold, and a third shutdown power threshold, respectively, and the magnitude relationship is: the second shutdown power The threshold is less than the third shutdown power threshold and greater than the first shutdown power threshold.

Step S3: Control the compressor to stop running when the load power is less than a predetermined shutdown power threshold.

In this embodiment, in order to reduce the vibration and stress of the piping of the compressor of the inverter air conditioner at the time of shutdown, unless the air conditioning system is faulty (abnormal), it is not appropriate to adopt the direct shutdown method under normal conditions, but gradually down-convert the operation until the refrigerant pressure Stop the compressor when it is small. Therefore, the load power of the inverter air conditioner can be monitored in real time or periodically. If the load power is greater than or equal to the predetermined shutdown power threshold, such as 800 W (for 3 inverter air conditioners), it indicates that the corresponding refrigerant pressure is still relatively high. Large, further controlling the compressor to continue to operate at a predetermined frequency; if the monitored load power is less than the predetermined shutdown power threshold, indicating that the corresponding refrigerant pressure has reached a safe range, the compressor can be controlled Stop running. Of course, in other embodiments, the predetermined shutdown power threshold may also be reasonably set according to the actual output power of the inverter air conditioner.

Specifically, when the load power of the inverter air conditioner is characterized by the compressor power, the power of the compressor is monitored in real time or periodically, and if the power of the compressor is monitored to be less than the first shutdown power threshold, the control station The compressor stops running;

When the load power of the inverter air conditioner is characterized by the outdoor unit power, the outdoor unit power is monitored in real time or periodically, and if the power of the outdoor unit is monitored to be less than the second power failure threshold, the compressor is stopped. run;

When the load power of the inverter air conditioner is characterized by the whole machine power (indoor power and outdoor unit power), the power of the whole machine is monitored in real time or periodically, and if the power of the indoor unit is monitored to be less than the third shutdown power The threshold controls the compressor to stop operating.

Wherein, the power detection method of the compressor includes at least the following four types:

1) Calculate the compressor power using the DC bus voltage and the DC bus current, ie

Compressor power = DC bus voltage × DC bus current;

Among them, DC bus voltage and DC bus current can be directly detected in the circuit, as shown in Figure 3.

2) Calculate the compressor power using the compressor speed and load torque, ie

Compressor power = compressor speed × load torque;

Among them, the compressor speed and load torque can be estimated by a sensorless control algorithm.

3) Calculate the compressor power using the direct shaft voltage, the direct shaft current, the cross shaft voltage, and the cross shaft current in the compressor vector control, that is,

Compressor power = straight-axis voltage × straight-axis current + cross-axis voltage × cross-axis current;

Among them, the straight-axis voltage, the direct-axis current, the cross-axis voltage, and the cross-axis current are intermediate variables of the compressor sensorless control algorithm.

4) Calculate the compressor power using the three-phase drive voltage and current of the compressor, ie

Compressor power = U phase voltage × U phase current + V phase voltage × V phase current + W phase voltage × W phase current;

The U-phase voltage, the V-phase voltage, and the W-phase voltage are compressor three-phase driving voltages, and the U-phase current, the V-phase current, and the W-phase current are compressor three-phase currents.

The method for detecting the power of the outdoor unit includes at least the following two types:

1) Calculate the power of the outdoor unit through the AC side voltage and current of the outdoor unit, ie

Outdoor unit instantaneous power = AC side instantaneous voltage × AC side instantaneous current;

Among them, the outdoor unit power is the average value of the outdoor unit instantaneous power, which can be obtained by low-pass filtering; the AC side instantaneous voltage and the AC side instantaneous current are sampled before the rectifier bridge, as shown in Figure 3.

2) Calculate the power of the outdoor unit through the DC voltage and current of the outdoor unit, that is,

Outdoor unit instantaneous power = DC side instantaneous voltage × DC side instantaneous current;

The outdoor unit power is the average value of the outdoor unit's instantaneous power, which can be obtained by low-pass filtering; among them, the DC side instantaneous voltage and the DC side instantaneous current are sampled after the rectifier bridge, as shown in Fig. 3.

The method for detecting the power of the whole machine includes at least the following methods:

Calculate the power of the whole machine through the AC voltage and current of the whole machine, that is,

Instantaneous power of the whole machine = instantaneous voltage of the whole machine AC × instantaneous current of the whole machine;

The whole machine power is the average value of the instantaneous power of the whole machine, which can be obtained by low-pass filtering.

The shutdown control method for the inverter air conditioner provided by the invention reduces the operating frequency of the compressor until the predetermined frequency is reached when the inverter air conditioner receives the stop signal, and then acquires the load power of the inverter air conditioner, and the load power is less than the predetermined When the power threshold is shut down, the compressor is controlled to stop running. In this way, by reducing the operating frequency of the compressor to a predetermined frequency and controlling the compressor to stop when the load power is less than the predetermined shutdown power threshold, the piping vibration and stress of the compressor of the inverter air conditioner can be reduced, and the service life of the piping can be prolonged. Thereby improving the system stability of the inverter air conditioner.

In the second embodiment, based on the first embodiment shown in FIG. 2, the step S1 further includes:

The inverter air conditioner controls the compressor to down-convert at a constant rate when receiving the shutdown signal until the minimum operating frequency is reached.

In this embodiment, when receiving the shutdown signal, the inverter air conditioner can control the compressor 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 can control the compressor to perform frequency reduction at a constant rate such as 1 Hz/s (assuming that the rated operating frequency of the compressor is 90 Hz, and the actual shutdown process is 30 s to 90 s), assuming that the compressor is initially Running at 90 Hz, the compressor is 80 Hz after 10 s. Run at frequency, run at 70Hz after 20s, and so on, until the minimum operating frequency is reached.

It should be understood that the specific values of the constant rate listed in this embodiment are not limiting, but may be reasonably set according to actual conditions.

In the third embodiment, referring to FIG. 4, based on the embodiment of the first embodiment shown in FIG. 2, the step S1 further includes:

Step S11, the inverter air conditioner acquires a current running frequency of the compressor when receiving a shutdown signal;

Step S12: determining a frequency interval in which the current operating frequency is located;

In this embodiment, when the inverter air conditioner receives the shutdown signal, the current operating frequency of the compressor is obtained, and the frequency interval in which the current operating frequency is located is determined, and the specific frequency interval may be two or three. One or three or more, the following two examples are taken as an example.

Step S13: When the frequency interval in which the current operating frequency is in the first frequency band, control the compressor to operate at a corresponding first deceleration frequency;

In this embodiment, it is assumed that the frequency interval includes a first frequency band and a second frequency band, wherein a frequency range value of the first frequency band is greater than a frequency range value of the second frequency band. If it is determined that the frequency range in which the current operating frequency of the compressor is located is the first frequency band, indicating that the operating frequency of the compressor is high at this time, therefore, a relatively large first deceleration frequency can be selected for rapid down-conversion until The current operating frequency is in the second frequency band.

Step S14: When the frequency interval in which the current operating frequency is in the second frequency band, the compressor is controlled to run at a corresponding second decreasing frequency until the minimum 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 is relatively low at this time, and therefore, a relatively small second deceleration frequency can be selected. Slowly down frequency until the minimum operating frequency is reached. That is, the second deceleration frequency is less than the first deceleration frequency, because the compressor has better stability at high frequency operation, and therefore, the deceleration frequency can be increased to shorten the downtime; and the compression The machine is relatively stable at low frequency operation, especially for single-rotor inverter compressors, and its stability is lower. Therefore, it is necessary to select a relatively small speed reduction frequency to improve stability.

In other embodiments, instead of dividing the frequency interval, the corresponding deceleration frequency is determined directly based on the current operating frequency of the compressor. Specifically, the relationship between the deceleration frequency of the compressor and the current operating frequency may be set to be positive correlation, that is, the higher the current operating frequency, the higher the corresponding deceleration frequency, and the corresponding relationship may be adopted. The calculation acquisition can also be obtained according to the look-up table, and is not limited.

In a specific example, as shown in FIG. 5, when the inverter air conditioner receives the shutdown signal during normal operation, the sub-band variable deceleration frequency can be performed to reduce the operating frequency of the compressor (two-stage variable speed reduction) Frequency: the first deceleration frequency and the second deceleration frequency), the compressor stop signal is triggered until the load power is less than the predetermined shutdown power threshold, thereby stopping the operation of the compressor.

In the fourth embodiment, referring to FIG. 6, on the basis of the second embodiment shown in FIG. 2, after the step S1, the method further includes:

Step S5: Obtain an running time of the compressor running at the lowest operating frequency;

Step S6: When the running time reaches a preset running time threshold, the compressor is controlled to stop running.

In this embodiment, when the operating frequency of the compressor is reduced to the minimum operating frequency, the running time running at the lowest operating frequency is acquired in real time or at a time. If the running time of the compressor running at the lowest operating frequency reaches the preset running time threshold, for example, 60s, it indicates that the corresponding refrigerant pressure has reached the safe range at this time, so the compressor can be controlled to stop running.

It should be understood that when the load power is less than the predetermined shutdown power threshold, the scheme for controlling the compressor shutdown operation and the running time for running through the compressor at the lowest operating frequency reach the preset operation time threshold, the scheme for controlling the compressor shutdown operation may be They are executed separately, that is, as long as any one of the schemes satisfies the condition, the compressor is stopped. The two schemes can also be combined, that is, considering both the load power and the time at which the compressor operates at the lowest operating frequency, such as If the load power of the compressor is greater than or equal to the predetermined shutdown power threshold, if the running time of the compressor running at the lowest operating frequency reaches the preset operating time threshold, then the compressor is stopped at this time; of course, it may be reversed And when the running time of the compressor running at the lowest operating frequency does not reach the preset running time threshold, if the load power of the compressor is less than the predetermined stopping power threshold, controlling the compressor to stop running.

In a specific example, as shown in FIG. 7, when the inverter air conditioner receives the shutdown signal during normal operation, the frequency division frequency reduction frequency can be performed to reduce the operating frequency of the compressor (two-stage variable speed reduction) Frequency: first deceleration frequency and second deceleration frequency) until the running time of the compressor running at the lowest operating frequency reaches a preset operating time threshold (when the load power of the compressor is greater than or equal to the predetermined stopping power threshold) The trigger stop signal is triggered to stop the compressor.

In the fifth embodiment, referring to FIG. 8, on the basis of the first embodiment, after the step S1, the method further includes:

Step S7: When receiving the shutdown signal, the inverter air conditioner obtains a frequency reduction time of the compressor for performing a frequency reduction operation;

In this embodiment, when receiving the shutdown signal, the inverter air conditioner obtains a frequency reduction time of the compressor being subjected to down-conversion operation in real time or timing, and the frequency reduction time includes that the operating frequency of the compressor falls to a predetermined time. The frequency is the running time of the lowest operating frequency and the running time of the compressor running at the lowest operating frequency.

Step S8: When the down-clocking time reaches the preset down-clock time threshold, the compressor is controlled to stop running.

In this embodiment, the preset down time threshold may be set to 90s. Of course, in other embodiments, other reasonable values may be set. When the down time of the compressor reaches the preset down time threshold, it indicates that the frequency reduction process has been completed at this time, and has been in a relatively stable state, and therefore, the compressor can be controlled to stop running.

In a specific example, as shown in FIG. 9, when the inverter air conditioner receives the shutdown signal during normal operation, the frequency division deceleration frequency can be divided to reduce the operating frequency of the compressor (two-stage variable speed reduction) Frequency: first deceleration frequency and second deceleration frequency) until the compressor operates at the lowest operating frequency, in the process, real time or timing acquisition of the downtime of the compressor, if the downtime reaches the pre When the down time threshold is set, the compressor stop signal is triggered to stop the compressor operation.

In addition, an embodiment of the present invention further provides an inverter air conditioner and a computer readable storage medium, the inverter air conditioner includes a shutdown control program, and the shutdown control program is configured to implement the steps of the shutdown control method of the inverter air conditioner as described above.

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 is executed by the processor to:

The inverter air conditioner reduces the operating frequency of the compressor until a predetermined frequency is reached when receiving the shutdown signal;

Obtaining a load power of the inverter air conditioner;

The compressor is controlled to stop running when the load power is less than a predetermined shutdown power threshold.

Further, when the shutdown control program of the inverter air conditioner is executed by the processor, the following operations are also implemented:

The inverter air conditioner controls the compressor to down-convert at a constant rate when receiving the shutdown signal until the minimum operating frequency is reached.

Further, when the shutdown control program of the inverter air conditioner is executed by the processor, the following operations are also implemented:

The inverter air conditioner acquires a current operating frequency of the compressor when receiving a shutdown signal;

Determining a frequency interval in which the current operating frequency is located;

Controlling the compressor to operate at a corresponding first deceleration frequency when the frequency range in which the current operating frequency is in the first frequency band;

When the frequency range in which the current operating frequency is in the second frequency band, the compressor is controlled to operate at a corresponding second decreasing frequency until the minimum operating frequency is reached.

Further, when the shutdown control program of the inverter air conditioner is executed by the processor, the following operations are also implemented:

The first frequency range is greater than the second frequency range, and the second frequency reduction frequency is smaller than the first frequency reduction frequency.

Further, when the shutdown control program of the inverter air conditioner is executed by the processor, the following operations are also implemented:

Obtaining an operating time of the compressor operating at the lowest operating frequency;

The compressor is stopped from operating when the runtime reaches a preset operating time threshold.

Further, when the shutdown control program of the inverter air conditioner is executed by the processor, the following operations are also implemented:

When receiving the shutdown signal, the inverter air conditioner obtains a frequency reduction time of the compressor for performing a frequency reduction operation;

When the down time reaches the preset down time threshold, the compressor is controlled to stop running.

Further, when the shutdown control program of the inverter air conditioner is executed by the processor, the following operations are also implemented:

The load power of the inverter air conditioner is one of a compressor power, an outdoor unit power of the inverter air conditioner, or a whole machine power of the inverter air conditioner.

Further, when the shutdown control program of the inverter air conditioner is executed by the processor, the following operations are also implemented:

The predetermined shutdown power thresholds corresponding to the compressor power, the outdoor unit power, and the whole machine power are a first shutdown power threshold, a second shutdown power threshold, and a third shutdown power threshold, respectively, and the magnitude relationship is: the second shutdown power The threshold is less than the third shutdown power threshold and greater than the first shutdown power threshold.

The specific embodiment of the shutdown control program of the inverter air conditioner is executed by the processor, and is not described herein.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structural transformation, or direct/indirect use, of the present invention and the contents of the drawings are used in the inventive concept of the present invention. It is included in the scope of the patent protection of the present invention in other related technical fields.

Claims (19)

 A shutdown control method for an inverter air conditioner, characterized in that the shutdown control method of the inverter air conditioner comprises the following steps: The inverter air conditioner reduces the operating frequency of the compressor until a predetermined frequency is reached when receiving the shutdown signal; Obtaining a load power of the inverter air conditioner; The compressor is controlled to stop running when the load power is less than a predetermined shutdown power threshold. The shutdown control method for an inverter air conditioner according to claim 1, wherein the step of reducing the operating frequency of the compressor when the inverter air conditioner receives the shutdown signal further comprises: The inverter air conditioner controls the compressor to down-convert at a constant rate when receiving the shutdown signal until the minimum operating frequency is reached. The shutdown control method for an inverter air conditioner according to claim 1, wherein the step of reducing the operating frequency of the compressor when the inverter air conditioner receives the shutdown signal further comprises: The inverter air conditioner acquires a current operating frequency of the compressor when receiving a shutdown signal; Determining a frequency interval in which the current operating frequency is located; Controlling the compressor to operate at a corresponding first deceleration frequency when the frequency range in which the current operating frequency is in the first frequency band; When the frequency range in which the current operating frequency is in the second frequency band, the compressor is controlled to operate at a corresponding second decreasing frequency until the minimum operating frequency is reached. The shutdown control method for an inverter air conditioner according to claim 3, wherein the first frequency band range is greater than the second frequency band range, and the second frequency reduction frequency is smaller than the first frequency reduction frequency. The method for controlling the shutdown of the inverter air conditioner according to claim 2 or 3, wherein the shutdown control method of the inverter air conditioner further comprises: Obtaining an operating time of the compressor operating at the lowest operating frequency; The compressor is stopped from operating when the runtime reaches a preset operating time threshold. The shutdown control method for an inverter air conditioner according to claim 1, wherein the shutdown control method of the inverter air conditioner further comprises: When receiving the shutdown signal, the inverter air conditioner obtains a frequency reduction time of the compressor for performing a frequency reduction operation; When the down time reaches the preset down time threshold, the compressor is controlled to stop running. The shutdown control method for an inverter air conditioner according to claim 1, wherein the load power of the inverter air conditioner is one of a compressor power, an outdoor unit power of the inverter air conditioner, or a whole machine power of the inverter air conditioner. The shutdown control method for an inverter air conditioner according to claim 7, wherein the predetermined power shutdown threshold corresponding to the compressor power, the outdoor unit power, and the whole machine power are a first shutdown power threshold and a second shutdown power threshold, respectively. And a third shutdown power threshold, the magnitude relationship of which is that the second shutdown power threshold is less than the third shutdown power threshold and greater than the first shutdown power threshold. The method for controlling the shutdown of an inverter air conditioner according to claim 1 or 7, wherein the step of acquiring the load power of the inverter air conditioner comprises: Obtaining a DC bus voltage and a DC bus current of the compressor; Calculating the product of the DC bus voltage and the DC bus current to obtain the load power of the inverter air conditioner. The method for controlling the shutdown of an inverter air conditioner according to claim 1 or 7, wherein the step of acquiring the load power of the inverter air conditioner comprises: Obtaining a speed and a load torque of the compressor; The product of the rotational speed of the compressor and the load torque is calculated to obtain the load power of the inverter air conditioner. The method for controlling the shutdown of an inverter air conditioner according to claim 1 or 7, wherein the step of acquiring the load power of the inverter air conditioner comprises: Obtaining a direct shaft voltage, a direct shaft current, a cross shaft voltage, and a cross shaft current of the compressor; Calculating a product of a straight-axis voltage of the compressor and the direct-axis current, a product of the cross-axis voltage and the cross-axis current, and taking a sum value to obtain a load power of the inverter air conditioner. The method for controlling the shutdown of an inverter air conditioner according to claim 1 or 7, wherein the step of acquiring the load power of the inverter air conditioner comprises: Obtaining a three-phase driving voltage and a three-phase driving current of the compressor; Calculating a product of each phase driving voltage of the compressor and a driving current, and taking a sum value to obtain a load power of the inverter air conditioner. The method for controlling the shutdown of an inverter air conditioner according to claim 1 or 7, wherein the step of acquiring the load power of the inverter air conditioner comprises: Obtaining an AC side instantaneous voltage and an AC side instantaneous current of the outdoor unit of the inverter air conditioner; Calculating a product of the AC side instantaneous voltage and the AC side instantaneous current to obtain a load power of the inverter air conditioner. The method for controlling the shutdown of an inverter air conditioner according to claim 1 or 7, wherein the step of acquiring the load power of the inverter air conditioner comprises: Obtaining a DC side instantaneous voltage and a DC side instantaneous current of the outdoor unit of the inverter air conditioner; Calculating a product of the DC side instantaneous voltage and the DC side instantaneous current to obtain a load power of the inverter air conditioner. The method for controlling the shutdown of an inverter air conditioner according to claim 1 or 7, wherein the step of acquiring the load power of the inverter air conditioner comprises: Obtaining the instantaneous voltage of the AC side of the inverter air conditioner and the instantaneous current of the AC side of the whole machine; Calculating the product of the instantaneous voltage on the AC side of the whole machine and the instantaneous current on the AC side of the whole machine to obtain the load power of the inverter air conditioner. The shutdown control method for an inverter air conditioner according to claim 1, wherein said A manner of reducing the operating frequency of the compressor includes controlling the compressor to down-convert at a constant rate until a predetermined frequency is reached; or controlling the compressor to down-convert at a varying rate until a predetermined frequency is reached. The shutdown control method for an inverter air conditioner according to claim 1, wherein said predetermined frequency is a lowest operating frequency of said compressor. An inverter air conditioner, characterized in that the inverter air conditioner comprises: 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 17. A computer readable storage medium, characterized in that the computer readable storage medium stores a shutdown control program of an inverter air conditioner, and the shutdown control program of the inverter air conditioner is executed by a processor to implement any of claims 1 to 17 A step of the shutdown control method of the inverter air conditioner.