CN113251586B

CN113251586B - Compressor control method and device, storage medium and air conditioning system

Info

Publication number: CN113251586B
Application number: CN202110482424.6A
Authority: CN
Inventors: 刘湘; 张琴兰
Original assignee: TCL Air Conditioner Zhongshan Co Ltd
Current assignee: TCL Air Conditioner Zhongshan Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2022-08-30
Anticipated expiration: 2041-04-30
Also published as: CN113251586A

Abstract

The application provides a compressor control method and device, a storage medium and an air conditioning system. The compressor control method includes: when a shutdown instruction is received, acquiring current operating parameters of the air conditioning system; according to the current operating parameters, the current rotating speed of the outdoor fan is adjusted, the compressor is controlled to stop until the current rotating speed of the outdoor fan reaches the preset target rotating speed, and therefore the outdoor fan stop control method and device can reduce the bus voltage firstly and then stop the outdoor fan through adjusting the current rotating speed of the outdoor fan before stopping the compressor, trigger the too high protection of the bus voltage when the compressor stops is avoided, protect other devices in an air-conditioning system from being damaged, and do not influence the normal use of other functions.

Description

Compressor control method and device, storage medium and air conditioning system

Technical Field

The application relates to the field of air conditioners, in particular to a compressor control method and device, a storage medium and an air conditioning system.

Background

With the issuance of new national energy efficiency standards, each air conditioner manufacturer uses a high-energy-efficiency compressor to obtain higher energy efficiency, and compared with a common compressor, a permanent magnet coil used by the high-energy-efficiency compressor has higher back electromotive force when the compressor is stopped at high frequency, and the generated high back electromotive force can influence the operation of devices in an air conditioning system.

At present, in order to protect the components of the air conditioning system from the impact of high back electromotive force, a bus voltage over-protection mechanism is arranged. This may cause excessive bus voltage protection each time the compressor is shut down at high frequency. Therefore, a control method is urgently needed to solve the problem that the shutdown of the compressor at high operating frequency is easy to cause the over-high protection of the bus voltage.

Disclosure of Invention

The application provides a compressor control method, a compressor control device, a storage medium and an air conditioning system, and aims to solve the problem that the shutdown of a compressor at a high operating frequency easily causes the overhigh bus voltage protection.

In a first aspect, the present application provides a compressor control method, which is applied to an air conditioning system including a compressor and an outdoor fan, and includes:

when a shutdown instruction is received, acquiring current operating parameters of the air conditioning system, wherein the current operating parameters comprise the current operating frequency of the compressor and the current rotating speed of the outdoor fan;

and adjusting the current rotating speed of the outdoor fan according to the current operating parameters, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches a preset target rotating speed.

In a possible implementation manner of the present application, the adjusting the current rotation speed of the outdoor fan according to the current operation parameter until the current rotation speed of the outdoor fan reaches a preset target rotation speed, includes:

detecting a target frequency interval in which the current operating frequency is located, wherein the target frequency interval is one of a plurality of preset frequency intervals;

acquiring the preset target rotating speed corresponding to the target frequency interval;

and if the current operating frequency is greater than the preset stop frequency, adjusting the current rotating speed of the outdoor fan, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches the preset target rotating speed.

In a possible implementation manner of the present application, the current operation parameter further includes a current bus voltage and a current back electromotive force, the current back electromotive force is a back electromotive force value to be generated when the compressor is stopped at a current operation frequency, and according to the current operation parameter, the current rotation speed of the outdoor fan is adjusted until the current rotation speed of the outdoor fan reaches a preset target rotation speed, the compressor is controlled to be stopped, including:

acquiring the difference between a preset safe voltage and the current bus voltage, wherein the preset safe voltage is the bus voltage when the trigger voltage is over-high for protection;

and if the difference between the preset safe voltage and the current bus voltage is smaller than the current back electromotive force, adjusting the current rotating speed of the outdoor fan according to the current operating parameter, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches a preset target rotating speed.

In a possible implementation manner of the present application, if the difference between the preset safe voltage and the current bus voltage is smaller than the current back electromotive force, the current rotational speed of the outdoor fan is adjusted according to the current operating parameter until the current rotational speed of the outdoor fan reaches the preset target rotational speed, and the compressor is controlled to stop, including:

when the current rotating speed of the outdoor fan reaches the preset target rotating speed, detecting the adjusted bus voltage of the air conditioning system, and acquiring the difference between the preset safe voltage and the adjusted bus voltage;

and if the difference between the preset safe voltage and the adjusted bus voltage is smaller than the current back electromotive force, adjusting the current rotating speed of the outdoor fan, and controlling the compressor to stop when the current rotating speed of the outdoor fan reaches a preset safe rotating speed, wherein the preset safe rotating speed is the rotating speed of the outdoor fan when the difference between the preset safe voltage and the bus voltage is larger than the current back electromotive force.

if the current operating frequency is greater than a preset shutdown frequency, generating a control signal for adjusting the current rotating speed of the outdoor fan, wherein the control signal comprises a pulse width modulation signal;

and adjusting the current rotating speed of the outdoor fan according to the control signal, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches a preset target rotating speed.

In a possible implementation manner of the present application, the adjusting the current rotation speed of the outdoor fan according to the current operation parameter until the current rotation speed of the outdoor fan reaches a preset target rotation speed, the controlling the compressor to stop includes:

adjusting the current rotating speed of the outdoor fan according to the current operating parameters until the current rotating speed of the outdoor fan reaches a preset target rotating speed, and detecting the pressure of an exhaust port and the pressure of an air suction port of the compressor;

if the difference between the pressure of the exhaust port and the pressure of the air suction port is smaller than a preset pressure value, controlling the compressor to stop;

or if the difference between the pressure of the exhaust port and the pressure of the air suction port is greater than the preset pressure value, reducing the current operation frequency of the compressor until the current operation frequency reaches the preset frequency, and controlling the compressor to stop.

In a second aspect, the present application provides a compressor control apparatus comprising:

the receiving unit is used for acquiring the current operation parameters of the air conditioning system when a shutdown instruction is received, wherein the current operation parameters comprise the current operation frequency of the compressor and the current rotating speed of the outdoor fan;

and the adjusting unit is used for adjusting the current rotating speed of the outdoor fan according to the current operating parameters, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches a preset target rotating speed.

In a possible implementation manner of the present application, the adjusting unit is further configured to:

In a possible implementation manner of the present application, the adjusting unit is specifically configured to:

In one possible implementation manner of the present application, the current operation parameters further include a current bus voltage and a current back electromotive force, where the current back electromotive force is a back electromotive force value to be generated when the compressor is stopped at a current operation frequency, and the adjusting unit is further configured to:

and if the difference between the preset safe voltage and the adjusted bus voltage is smaller than the current back electromotive force, adjusting the rotating speed of the outdoor fan until the current rotating speed of the outdoor fan reaches a preset safe rotating speed, and controlling the compressor to stop, wherein the preset safe rotating speed is the rotating speed of the outdoor fan when the difference between the preset safe voltage and the bus voltage is larger than the current back electromotive force.

if the current operating frequency is greater than the preset shutdown frequency, generating a control signal for adjusting the current rotating speed of the outdoor fan, wherein the control signal comprises a pulse width modulation signal;

or if the difference between the pressure of the exhaust port and the pressure of the air suction port is larger than the preset pressure value, reducing the current operating frequency of the compressor until the current operating frequency reaches the preset frequency, and controlling the compressor to stop.

In a third aspect, the present application further provides an air conditioning system, where the air conditioning system includes a processor and a memory, where the memory stores a computer program, and the processor executes the steps in any one of the compressor control methods provided in the present application when calling the computer program in the memory.

In a fourth aspect, the present application further provides a computer readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to execute the steps of the compressor control method.

The method comprises the steps that when a shutdown instruction is received, current operation parameters of the air conditioning system are obtained; according to the current operation parameters, the current rotating speed of the outdoor fan is adjusted until the current rotating speed of the outdoor fan reaches the preset target rotating speed, the compressor is controlled to stop, and therefore the outdoor fan stopping method and the outdoor fan stopping device can reduce the bus voltage before stopping by adjusting the current rotating speed of the outdoor fan, trigger the too high protection of the bus voltage when the compressor stops, protect other devices in an air conditioning system from being damaged, and do not influence normal use of other functions.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic flow chart of a compressor control method provided in an embodiment of the present application;

FIG. 2 is a schematic flow chart of a compressor control method provided in an embodiment of the present application;

FIG. 3 is a schematic flow chart of a compressor control method provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of an MCU and an outdoor fan provided in the embodiments of the present application;

fig. 5 is a schematic structural diagram of an embodiment of a compressor control device provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of an embodiment of an air conditioning system provided in the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known processes have not been described in detail so as not to obscure the description of the embodiments of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in the embodiments herein.

The embodiment of the application provides a compressor control method and device, a computer readable storage medium and an air conditioning system. Wherein the compressor control means may be integrated in an air conditioning system.

First, before describing the embodiments of the present application, the related contents of the embodiments of the present application with respect to the application context will be described.

The bus of the air conditioning system is used as a conductor for connecting each device in the air conditioning system and collecting, distributing and transmitting electric energy to each device, and the voltage on the bus is called as bus voltage.

The bus voltage of the air conditioning system is not a fixed value, the bus voltage fluctuates in a certain range, and if the preset bus voltage is 380V and the voltage fluctuation amplitude is 10V, the bus voltage fluctuates between 370 and 390V. Assuming that when the compressor is stopped at 100Hz, the generated back emf is 38V and the critical bus voltage triggering bus overvoltage protection is 420V. If the bus voltage is at the peak of the bus voltage and the compressor is stopped at 100Hz, the bus voltage can reach 390+38 to 428V, and if the bus voltage is at the valley of the bus voltage and the compressor is stopped at 100Hz, the bus voltage can reach 370+38 to 408V, so that the stop of the compressor at 100Hz is very likely to trigger the bus voltage overhigh protection. It should be noted that, in the normal operation frequency range of the compressor, the magnitude of the back electromotive force also increases with the increase of the operation frequency of the compressor, for example, for the compressor with the operation frequency of 100Hz, the back electromotive force generated at the shutdown time may be 38V, and for the compressor with the operation frequency of 120Hz, the back electromotive force generated at the shutdown time may be more than 38V, for example, 40V.

The bus voltage over-high protection refers to a protection mechanism which is set for protecting devices of the air conditioning system from being damaged due to the fact that the bus voltage is over-high, and specifically refers to that when the bus voltage is detected to be larger than a certain set threshold value, protection is reported or work is automatically stopped through a mode of alarming and the like. However, for a compressor working at a high frequency, bus voltage over-protection may be caused during each shutdown, and frequent bus voltage over-protection may also cause impact on devices of the air conditioning system, resulting in a damaged device life.

Based on the above-mentioned drawbacks of the related art, embodiments of the present application provide a compressor control method, which overcomes at least some of the drawbacks of the related art.

The main body for executing the compressor control method according to the embodiment of the present application may be the compressor control device provided in the embodiment of the present application, or an air conditioning system incorporating the compressor control device, where the compressor control device may be implemented in a hardware or software manner.

The air conditioning system can adopt a working mode of independent operation or can also adopt a working mode of equipment cluster.

Next, a description will be given of a compressor control method provided in an embodiment of the present application, in which an air conditioner is used as an execution main body, and in the following method embodiments, the execution main body will be omitted for simplicity and convenience of description.

Referring to fig. 1, fig. 1 is a schematic flow chart of a compressor control method according to an embodiment of the present application. It should be noted that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described may be performed in an order different from that shown or described herein. The compressor control method comprises the following steps of 10-20, wherein:

10. and when a shutdown instruction is received, acquiring current operation parameters of the air conditioning system, wherein the current operation parameters comprise the current operation frequency of the compressor and the current rotating speed of the outdoor fan.

The stop command is a command for shutting down a compressor in the air conditioning system.

The stop command may be sent in various manners, and in some embodiments, the stop command may be sent by a user through a device having an input function, such as a remote controller. For example, when a user wants to turn off the air conditioning system, the user may send a turn-off command including a shutdown command through the remote controller, and when the air conditioning system receives the turn-off command, the user may control the compressor according to the shutdown command included in the turn-off command.

The current operation parameters may include a current operation frequency of the compressor and a current rotation speed of the outdoor fan, among others. For example, the current operating parameters may be the operating frequency of the compressor and the rotational speed of the outdoor fan when a shutdown command is received. For example, when a shutdown instruction is received, if the operating frequency of the compressor is 100Hz and the rotation speed of the outdoor fan is 5000 rpm, the current operating parameters are: the current operating frequency is 100Hz and the current rotational speed is 5000 rpm. It should be noted that the current operating frequency refers to a detected operating frequency, and the actual operating frequency may slightly fluctuate compared to the current operating frequency due to a detection error or the like, and a manner of avoiding triggering the bus voltage over-high protection caused by the detection error is specifically described below.

Further, the current operating parameters may also include any parameter that may be used as a guess for the bus voltage. For example, the current operating parameter may also include a discharge temperature of the compressor. For example, if the bus voltage at the exhaust temperature of 100 ℃ can be obtained according to the corresponding relationship between the exhaust temperature and the bus voltage, the exhaust temperature of 100 ℃ may also be the current operating parameter.

20. And adjusting the current rotating speed of the outdoor fan according to the current operating parameters, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches a preset target rotating speed.

The preset target rotating speed refers to the rotating speed of the outdoor fan when the bus voltage of the air conditioning system cannot trigger the protection of the overhigh bus voltage if the compressor is shut down at the current operating frequency.

The preset target rotation speed may be determined in various manners.

In some embodiments, the preset target speed may be determined according to the magnitude of the current operating frequency. For example, if the bus voltage when the bus voltage over-protection is triggered is 420V, all the rotational speeds at which the bus voltage after the compressor is stopped is reduced to 420V or less may be set as the preset target rotational speed. For example, when the outdoor fan operates at 10000 rpm, the bus voltage of the compressor after shutdown may be reduced to 410V, and the preset target rpm may be 10000 rpm, and when the outdoor fan operates at 11000 rpm, the bus voltage of the compressor after shutdown may be reduced to 400V, and the preset target rpm may also be 11000 rpm. When adopting high rotational speed, power consumption is great, but is safer, and when adopting low rotational speed, power consumption is less, but because the bus voltage that reduces is little, probably because reasons such as detection error trigger bus voltage too high protection, consequently need select the target rotational speed of predetermineeing relatively rationally according to practical application scene. It should be noted that the rotation speed, the back electromotive force and the current operating frequency are exemplified in this paragraph only for convenience of description, and are not to be construed as limiting the embodiments of the present application.

Further, the reason why the bus voltage can be reduced by adjusting the rotating speed of the outdoor fan includes: after the outdoor fan rotates, the electric energy stored in the capacitor on the bus is consumed, and the voltage of the bus is consumed and pulled down. Therefore, the higher the preset target rotating speed of the outdoor fan is, the more the electric energy in the bus filter capacitor is consumed, and the smaller the bus voltage is. It will be appreciated that the back emf generated when the compressor is shut down is different for different current operating frequencies. Therefore, different preset target rotational speeds need to be set for different current operating frequencies. For example, if the current operating frequency is 120Hz, the rate of change of the magnetic flux at the time of the compressor shutdown is greater than that at the time of the current operating frequency of 100Hz, and thus the generated back electromotive force is greater, and thus more bus voltage needs to be reduced by the outdoor fan, and thus the preset target rotational speed of the outdoor fan is greater. If the preset target rotation speed is 10000 rpm when the current operation frequency is 100Hz, the preset target rotation speed is greater than 10000 rpm when the current operation frequency is 120Hz, for example, 12000 rpm may be achieved.

In order to ensure that the bus voltage is reduced when the compressor is stopped, the stop can be delayed after the rotating speed of the outdoor fan is adjusted. For example, the compressor can be stopped after 5-10 minutes after the rotating speed of the outdoor fan is adjusted, so that the bus voltage is reduced to a safe voltage.

In summary, in the embodiment of the present application, when a shutdown instruction is received, the current operation parameters of the air conditioning system are obtained; according to the current operation parameters, the current rotating speed of the outdoor fan is adjusted to the preset target rotating speed, and the compressor is controlled to stop, so that the bus voltage can be reduced firstly and then the outdoor fan is stopped by adjusting the current rotating speed of the outdoor fan before the outdoor fan is stopped, the phenomenon that the bus voltage is too high when the compressor is stopped is avoided, other devices in an air conditioning system are protected from being damaged, and normal use of other functions is not influenced.

In order to more accurately adjust the current rotating speed of the outdoor fan and avoid excessive electric quantity waste during adjustment of the current rotating speed, the current rotating speed of the outdoor fan can be adjusted in a targeted manner according to a frequency interval where the current operating frequency is located. Referring to fig. 2, at this time, step 20 may specifically include steps 21A-23A:

21A, detecting a target frequency interval in which the current operating frequency is located, wherein the target frequency interval is one of a plurality of preset frequency intervals.

22A, the preset target rotating speed corresponding to the target frequency interval is obtained.

The frequency interval may be an interval divided according to a counter electromotive force generated when the compressor is stopped. For example, the back emf can be divided into a plurality of ranges, and then a frequency interval can be correspondingly divided for each back emf range. For example, assuming that the current operating frequency is 60Hz when the back electromotive force is 5V, the current operating frequency is 70Hz when the back electromotive force is 10V, and so on, the back electromotive force increases by 5V every 10Hz when the current operating frequency is 30Hz, and the back electromotive force is 0V when the current operating frequency is 30Hz, 30Hz-60Hz may be set as a frequency interval, and the back electromotive force range corresponding to the frequency interval is 0-5V; setting 60-70Hz as a frequency interval, wherein the counter electromotive force range corresponding to the frequency interval is 5-10V, and so on.

For each frequency interval, a rotating speed which can enable the bus voltage not to trigger the bus voltage overhigh protection after the shutdown can be determined according to the counter electromotive force corresponding to the frequency. Because the frequency is in positive correlation with the counter electromotive force, and the rotating speed is in positive correlation with the reduced bus voltage, for each frequency interval, a safe rotating speed can be determined, so that when the compressor works at any frequency in the frequency interval, the bus voltage cannot be triggered to be protected from being overhigh after the compressor is stopped, namely when the outdoor fan works at the safe rotating speed, the bus voltage which can be reduced is greater than the counter electromotive force corresponding to the maximum frequency in the frequency interval where the current operating frequency is located. For example, for a frequency interval of 60Hz-70Hz, assuming that the compressor operates at 70Hz, the back emf generated after shutdown is equal to 10V of the bus voltage reduced by adjusting the current speed of the outdoor fan to 15000 rpm. Because the counter electromotive force generated by the shutdown of the compressor when the compressor works at 70Hz is more than or equal to the counter electromotive force generated by the shutdown of the compressor when the compressor works at any frequency in the frequency range of 60Hz-70Hz, if the compressor stops working at 60Hz, the current rotating speed of the outdoor fan is adjusted to be more than 15000 r/min, for example, the bus voltage reduced by 16000 r/min is inevitably greater than the generated counter electromotive force, and the bus voltage is not triggered to be excessively high for protection, so the safe rotating speed can be 16000 r/min.

The target frequency interval may be a frequency interval in which the current operating frequency is located. Illustratively, assuming that a plurality of frequency intervals including 30Hz-60Hz, 60Hz-70Hz are obtained as an example in step 21A, the current operating frequency of the compressor is 65Hz, and the target frequency interval is a frequency interval of 60Hz-70 Hz.

In some embodiments, in order to ensure that the bus bar voltage over-protection is not triggered when the current operating frequency is not detected correctly, the target frequency interval may also be a frequency interval in which the minimum frequency is greater than or equal to the current operating frequency. For example, if the current operating frequency is 59Hz, a frequency interval of 60Hz to 70Hz, in which the minimum frequency is equal to or higher than the current operating frequency, may be used as the target frequency interval. When the current running frequency is not detected, if the actual running frequency is 70Hz, the detected current running frequency is 59Hz, and if 30Hz-60Hz is taken as a target frequency interval, the maximum counter electromotive force obtained according to the target frequency interval is 5V, but the actually generated counter electromotive force may be 10V, so that the current rotating speed adjustment of the outdoor fan generates an error, and the bus voltage overhigh protection is triggered. On the other hand, if the frequency interval of 60Hz-70Hz is taken as the target frequency interval, the maximum counter electromotive force obtained according to the target frequency interval is 10V, so that the bus voltage overhigh protection cannot be triggered.

The preset target rotation speed in steps 21A-22A may be a safe rotation speed corresponding to the target frequency interval. For example, for a frequency interval of 60Hz-70Hz, the preset target rotation speed may be 16000 rpm, assuming that the safe rotation speed is 16000 rpm. The concept of a safe rotational speed has already been explained above and is not described in further detail here.

The advantage of using the safe rotating speed as the preset target rotating speed is that even if certain frequency fluctuation occurs when the current operating parameters are detected, the bus voltage overhigh protection can be ensured not to be triggered.

And 23A, adjusting the current rotating speed of the outdoor fan according to the current operating parameters, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches a preset target rotating speed.

Because the counter electromotive force generated when the compressor works under low frequency is not high, the current rotating speed of the outdoor fan is required to be adjusted only when the current operating frequency is high frequency. At this time, the current operating frequency and the preset shutdown frequency need to be compared before the current rotating speed of the outdoor fan is adjusted.

The preset shutdown frequency refers to the minimum frequency at which the bus voltage overhigh protection can be triggered after the compressor is shut down. For example, assuming that the minimum voltage triggering the bus voltage over-protection is 420V, the counter electromotive force generated by the shutdown when the compressor operates at a frequency of 100Hz or less is 10V, and the counter electromotive force generated by the shutdown when the compressor operates at a frequency of 100Hz is 38V, if the compressor operates at a frequency of 100Hz or less, the shutdown will not trigger the bus voltage over-protection even if the bus voltage is 390V at the peak, whereas if the compressor operates at 100Hz, the shutdown will trigger the bus voltage over-protection if the bus voltage is 390V at the peak, and thus the preset shutdown frequency may be set to 100 Hz.

Further, in order to ensure that the bus voltage over-protection is not triggered when the current operation frequency is not detected correctly, the preset shutdown frequency may be set to be a frequency smaller than the minimum frequency. For example, due to the error of the detection algorithm, the actual operating frequency may be greater than the detected current operating frequency, and therefore the actual generated back electromotive force may be greater than the back electromotive force calculated according to the current operating frequency, and in this case, if the minimum frequency is used as the preset shutdown frequency, the bus bar voltage over-protection may be triggered after shutdown. For example, assuming that the minimum voltage for triggering the bus voltage overvoltage protection is 420V, the preset shutdown frequency is 100Hz, and the actual operating frequency is 100Hz, but the current operating frequency detected due to the detection algorithm and the like is 99Hz, the current operating frequency is smaller than the preset shutdown frequency, and the current rotating speed of the outdoor fan cannot be adjusted, so that the bus voltage overvoltage protection is triggered during shutdown. To avoid such triggering due to detection errors, the preset shutdown frequency may be set to 90Hz in the example in this paragraph.

The method can judge whether the current rotating speed of the outdoor fan needs to be adjusted according to the current running frequency of the compressor, and can also judge whether the current rotating speed of the outdoor fan needs to be adjusted according to the bus voltage of the air conditioning system when the shutdown instruction is received. Referring to fig. 3, at this time, step 20 may specifically include steps 21B-22B:

and 21B, obtaining the difference between a preset safe voltage and the current bus voltage, wherein the preset safe voltage refers to the bus voltage when the trigger voltage is over-high for protection.

The preset safety voltage refers to the minimum bus voltage for triggering the bus voltage overhigh protection. For example, the preset safety voltage may be a voltage preset according to a circuit condition of the air conditioning system. For example, if the bus voltage of the air conditioning system reaches 420V, which may cause device damage, the preset safe voltage may be set to 420V when the air conditioning system leaves the factory, so as to avoid device damage. For example, if the air conditioning system includes a device with poor voltage tolerance and the device is damaged when the bus voltage reaches 410V, the preset safe voltage may be set to 410V when the air conditioning system is shipped.

The current bus voltage refers to the bus voltage of the air conditioning system when the shutdown instruction is received. For example, when the air conditioning system receives a shutdown instruction, the bus voltage is 370V at the trough, and the current bus voltage is 370V. For another example, when the air conditioning system receives a shutdown instruction, the bus voltage is at a peak 390V, and the current bus voltage is 390V.

The difference between the preset safe voltage and the current bus voltage is the difference value obtained by subtracting the current bus voltage from the preset safe voltage. For example, if the preset safe voltage is 420V and the current bus voltage is at the valley 370V, the difference between the preset safe voltage and the current bus voltage is 50V. For another example, if the preset safe voltage is 420V and the current bus voltage is at the peak 390V, the difference between the preset safe voltage and the current bus voltage is 30V.

And 22B, if the difference between the preset safe voltage and the current bus voltage is smaller than the current back electromotive force, adjusting the current rotating speed of the outdoor fan according to the current operating parameter, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches a preset target rotating speed.

The present back electromotive force is a value of back electromotive force generated when the compressor operating at the present operation frequency is stopped. Illustratively, the current back emf can be obtained from a plot of operating frequency versus back emf. For example, when the operation frequency of the compressor is 100Hz and the back electromotive force is 38V as observed from the relationship curve, if the current operation frequency is 100Hz, the current back electromotive force is 38V. For another example, when the operating frequency of the compressor is 30Hz and the back electromotive force is 0V as observed from the relationship curve, if the previous operating frequency is 30Hz, the current back electromotive force is 0V.

When the difference between the preset safe voltage and the current bus voltage is larger than the current back electromotive force, the bus voltage cannot trigger over-high voltage protection even if the shutdown generates the back electromotive force. Illustratively, if the preset safe voltage is 420V and the current bus voltage is at the wave trough 370V, the difference between the preset safe voltage and the current bus voltage is 50V, and assuming that the current operating frequency is 100Hz, the current back electromotive force is determined to be 38V according to the relation curve of the operating frequency and the back electromotive force. Therefore, even if the outdoor fan is stopped at the moment, the bus voltage reaches 370V +38V to 408V, and the preset safe voltage 420V cannot be exceeded, so that the over-voltage protection cannot be triggered, and the current rotating speed of the outdoor fan does not need to be adjusted.

On the contrary, if the current bus voltage is at a peak of 390V, the difference between the preset safe voltage and the current bus voltage is 30V, the operation is stopped at this moment, the bus voltage reaches 390V +38V to 428V, which exceeds the safe voltage 420V, so that the voltage over-high protection is triggered, and therefore the current rotating speed of the outdoor fan needs to be adjusted.

Therefore, the schemes provided in

steps

21B and 22B can determine in real time whether the current rotation speed of the outdoor fan needs to be adjusted according to the fluctuation condition of the bus voltage, thereby avoiding unnecessary adjustment of the current rotation speed when the bus voltage is near the trough of the wave, and increasing energy consumption.

In order to avoid that the actually reduced bus voltage is smaller than the reduced bus voltage under an ideal condition due to circuit faults and other reasons after the current rotating speed of the outdoor fan is adjusted to the preset target rotating speed, the bus voltage can be measured for one time after the current rotating speed is adjusted. In this case, step 22B may specifically include steps 221B-222B:

221B, when the current rotating speed of the outdoor fan reaches the preset target rotating speed, detecting the adjusted bus voltage of the air conditioning system, and acquiring the difference between the preset safe voltage and the adjusted bus voltage.

The adjusted bus voltage refers to the bus voltage which is reduced after the current rotating speed of the outdoor fan is adjusted. For example, assuming that the current bus voltage is 380V, the bus voltage is reduced to 370V after the current rotation speed of the outdoor fan is adjusted, and the adjusted bus voltage is 370V. Further, if the preset safe voltage is set to 420V, the difference between the preset safe voltage and the adjusted bus voltage is 40V.

The purpose of detecting the adjusted bus voltage is to judge whether the reduced bus voltage is insufficient due to detection errors or circuit faults and other reasons when the current rotating speed is adjusted to the preset target rotating speed, so that the actually reduced bus voltage still triggers the bus voltage overhigh protection.

222B, if the difference between the preset safe voltage and the adjusted bus voltage is smaller than the current back electromotive force, adjusting the current rotating speed of the outdoor fan, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches a preset safe rotating speed, wherein the preset safe rotating speed is the rotating speed of the outdoor fan when the difference between the preset safe voltage and the bus voltage is larger than the current back electromotive force.

The preset safe rotating speed is a high rotating speed which can ensure that after the compressor is shut down, the bus voltage is reduced to a value which can not trigger the over-high voltage protection. For example, the preset safe rotation speed may be set to the maximum rotation speed of the outdoor fan. For example, the maximum rotation speed of the outdoor fan is 20000 rpm, and 20000 rpm may be set as the preset safe rotation speed. The bus voltage after the compressor is shut down can be reduced to 350V by adjusting the rotating speed to 20000 revolutions per minute, so that even if the bus voltage after actual reduction is slightly higher than 350V due to detection errors or circuit faults, the over-high protection of the voltage can be ensured not to be triggered.

Therefore, in the scheme in steps 221B-222B, the bus voltage is measured once after the current rotational speed of the outdoor fan is adjusted, and if the measured bus voltage still may trigger the over-voltage protection, the rotational speed of the outdoor fan is adjusted to a high rotational speed again, so that the bus voltage does not trigger the over-voltage protection. Through the scheme in the steps 221B-222B, the probability of overhigh triggering voltage of the bus voltage when the compressor is stopped can be further reduced, and devices in the air conditioning system are protected.

In addition, in order to reduce the power consumption of the air conditioning system, a Pulse Width Modulation (PWM) signal may be used to adjust the current rotation speed of the outdoor fan. In this case, step 20 may specifically include steps 21C-22C:

and 21C, if the current running frequency is greater than the preset shutdown frequency, generating a control signal for adjusting the current rotating speed of the outdoor fan, wherein the control signal comprises a pulse width modulation signal.

And 22C, adjusting the current rotating speed of the outdoor fan according to the control signal, and controlling the compressor to stop until the current rotating speed of the outdoor fan reaches a preset target rotating speed.

The preset shutdown frequency may refer to the explanation in step 23A, and is not described herein again.

Wherein the control signal may be generated in a control chip of the air conditioning system. Illustratively, the control chip may be a Micro Controller Unit (MCU). The control chip is specifically exemplified as an MCU hereinafter. And if the current running frequency is greater than the preset shutdown frequency, generating a control signal for adjusting the current rotating speed of the outdoor fan in the MCU.

The PWM signal is a signal for adjusting a duty ratio of the voltage signal. Referring to fig. 4, specifically, if the current operating frequency is greater than the preset shutdown frequency, a PWM signal for adjusting the voltage signal of the outdoor fan is generated in the MCU, and when the duty ratio of the voltage signal of the outdoor fan is increased, the average driving voltage of the outdoor fan is also increased, so that the current rotation speed of the outdoor fan is also increased to the preset target rotation speed.

When the compressor is stopped, the refrigerant at the air suction port of the compressor is sucked away and can not be supplemented, and the residual refrigerant in the compressor can still be supplemented at the air exhaust port of the compressor in a short time, so that the pressure at the air suction port of the compressor is far less than the pressure at the air exhaust port. Under the effect of pressure, the inside great recoil force that can produce of compressor causes the influence to the stability of compressor.

In order to avoid the influence of the pressure difference between the pressure of the air suction port and the pressure of the air exhaust port on the stability of the compressor, the difference between the pressure of the air suction port and the pressure of the air exhaust port of the compressor can be obtained before the shutdown, and then whether the shutdown can be performed or not is judged according to the difference between the pressure of the air suction port and the pressure of the air exhaust port of the compressor. Step 20 may then specifically include steps 21D-23D:

and 21D, adjusting the current rotating speed of the outdoor fan according to the current operating parameters until the current rotating speed of the outdoor fan reaches a preset target rotating speed, and detecting the pressure of an exhaust port and the pressure of an air suction port of the compressor.

Among them, there are various ways of detecting the discharge port pressure and the suction port pressure of the compressor.

In some embodiments, the suction pressure and the discharge pressure of the compressor may be detected by sensors disposed at the compressor suction and discharge, respectively.

And 22D, if the difference between the pressure of the exhaust port and the pressure of the air suction port is smaller than a preset pressure value, controlling the compressor to stop.

23D, or if the difference between the pressure of the exhaust port and the pressure of the air suction port is larger than the preset pressure value, reducing the current operation frequency of the compressor until the current operation frequency reaches the preset frequency, and controlling the compressor to stop.

Wherein, the preset pressure value is a pressure value which does not affect the stability of the compressor. Illustratively, the preset pressure value is a minimum pressure value that does not affect the stability of the compressor. The preset pressure value may be set to 100 kpa, assuming that the components inside the compressor are impacted by a pressure of 100 kpa minimum, which may cause the components inside the compressor to loosen. For compressors containing shock intolerant parts, the corresponding predetermined pressure value may be less. For example, the predetermined pressure value may be set to 80 kpa, assuming that a component inside the compressor will fail when impacted by a minimum pressure of 80 kpa.

Further, in order to prevent the pressure difference detected due to the detection error of the sensor from being smaller than the actual pressure difference, the pressure difference acquired under the condition that the actual pressure difference between the pressure of the exhaust port and the pressure of the suction port is larger than the preset pressure value is judged to be smaller than the preset pressure value, and the preset pressure value can be set to be smaller so as to ensure that the misjudgment does not occur. For example, assuming that parts inside the compressor are loosened when the pressure difference between the discharge port pressure and the suction port pressure reaches 100 kpa, the preset pressure value may be set to 90 kpa. Even if the actual pressure difference between the pressure of the exhaust port and the pressure of the suction port is larger than the preset pressure value due to the detection error of the sensor, for example, the actual pressure difference is 91 kilopascal, the stability of the compressor cannot be influenced by controlling the compressor to stop.

The preset frequency is the operating frequency of the compressor when the pressure difference between the pressure of the exhaust port and the pressure of the suction port is smaller than the preset pressure value. For example, assuming that the operation frequency of the compressor is 80Hz when the pressure difference between the discharge port pressure and the suction port pressure is equal to the preset pressure value, the preset frequency may be any frequency less than 80 Hz.

When the pressure difference between the discharge port pressure and the suction port pressure is greater than the preset pressure value, it means that the direct control of the compressor stop may cause impact on the parts inside the compressor, and thus it is necessary to reduce the current operating frequency of the compressor to reduce the pressure difference. For example, assuming that the preset frequency is 75Hz and the preset pressure value is 100 kpa, if the exhaust port pressure detected by the sensor is 200 kpa and the suction port pressure is 99 kpa, the pressure difference between the exhaust port pressure and the suction port pressure is 101 kpa, the immediate shutdown may have an influence on the reliability of the compressor, and thus the operation frequency of the compressor is reduced to 75Hz to reduce the pressure difference between the exhaust port pressure and the suction port pressure, and then the compressor is controlled to be stopped.

Furthermore, in order to ensure that the compressor cannot be impacted by too high pressure difference when being stopped, the operation frequency of the compressor can be delayed for several minutes after being reduced to the preset frequency, and then the compressor is controlled to be stopped so as to ensure that the pressure difference after the frequency is reduced is lower than the preset pressure value.

In order to better implement the compressor control method in the embodiment of the present application, based on the compressor control method, a compressor control device is further provided in the embodiment of the present application, as shown in fig. 5, which is a schematic structural diagram of an embodiment of the compressor control device in the embodiment of the present application, the compressor control device 500 is applied to an air conditioning system, the air conditioning system includes a compressor and an outdoor fan, and the compressor control device 500 includes:

a receiving unit 501, configured to obtain a current operation parameter of the air conditioning system when a shutdown instruction is received, where the current operation parameter includes a current operation frequency of the compressor and a current rotation speed of the outdoor fan;

an adjusting unit 502, configured to adjust the current rotation speed of the outdoor fan according to the current operation parameter, and control the compressor to stop until the current rotation speed of the outdoor fan reaches a preset target rotation speed.

In a possible implementation manner of the present application, the adjusting unit 502 is further configured to:

In a possible implementation manner of the present application, the current operation parameters further include a current bus voltage and a current back electromotive force, where the current back electromotive force is a back electromotive force to be generated when the compressor is stopped at a current operation frequency, and the adjusting unit 502 is further configured to:

In a specific implementation, the above units may be implemented as independent entities, or may be combined arbitrarily to be implemented as the same or several entities, and the specific implementation of the above units may refer to the foregoing method embodiments, which are not described herein again.

Since the compressor control apparatus can execute the steps in the compressor control method according to any embodiment of the present application corresponding to fig. 1 to 4, the beneficial effects that can be achieved by the compressor control method according to any embodiment of the present application corresponding to fig. 1 to 4 can be achieved, and the detailed description is given in the foregoing description, and will not be repeated herein.

In addition, in order to better implement the method for controlling the compressor in the embodiment of the present application, based on the method for controlling the compressor, the embodiment of the present application further provides an air conditioning system, referring to fig. 6, fig. 6 shows a schematic structural diagram of the air conditioning system in the embodiment of the present application, specifically, the air conditioning system in the embodiment of the present application includes a processor 601, and when the processor 601 is used for executing a computer program stored in a memory 602, each step of the method for controlling the compressor in any embodiment corresponding to fig. 1 to 4 is implemented; alternatively, the processor 601 is configured to implement the functions of the units in the corresponding embodiment shown in fig. 5 when executing the computer program stored in the memory 602.

Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in memory 602 and executed by processor 601 to implement embodiments of the present application. One or more modules/units may be a series of computer program instruction segments capable of performing certain functions, the instruction segments being used to describe the execution of a computer program in a computer device.

The air conditioning system may include, but is not limited to, a processor 601, a memory 602. It will be understood by those skilled in the art that the illustration is merely an example of an air conditioning system, and does not constitute a limitation of the air conditioning system, and may include more or less components than those illustrated, or combine some of the components, or different components, for example, the air conditioning system may further include an input output device, a network access device, a bus, etc., and the processor 601, the memory 602, the input output device, the network access device, etc., are connected via the bus.

The Processor 601 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center for the air conditioning system and connected to the various parts of the overall air conditioning system by various interfaces and lines.

The memory 602 may be used to store computer programs and/or modules, and the processor 601 may implement various functions of the computer apparatus by executing or executing the computer programs and/or modules stored in the memory 602 and invoking data stored in the memory 602. The memory 602 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, video data, etc.) created according to the use of the air conditioning system, etc. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the compressor control apparatus, the air conditioning system and the corresponding units thereof described above may refer to the description of the compressor control method in any embodiment corresponding to fig. 1 to 4, and are not described herein again in detail.

It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer readable storage medium and loaded and executed by a processor.

For this reason, an embodiment of the present application provides a computer-readable storage medium, in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute steps in a compressor control method in any embodiment corresponding to fig. 1 to 4 in the present application, and specific operations can refer to descriptions of the compressor control method in any embodiment corresponding to fig. 1 to 4, which are not repeated herein.

Wherein the computer-readable storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, and the like.

Since the instructions stored in the computer-readable storage medium can execute the steps in the compressor control method according to any embodiment of the present application, such as those shown in fig. 1 to 4, the beneficial effects that can be achieved by the compressor control method according to any embodiment of the present application, such as those shown in fig. 1 to 4, can be achieved, and are not described in detail herein.

The above detailed description is provided for a compressor control method, a compressor control device, a storage medium, and an air conditioning system according to embodiments of the present application, and specific examples are applied herein to explain the principles and implementations of the present application, and the description of the above embodiments is only used to help understand the method and the core concept of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A compressor control method is applied to an air conditioning system, wherein the air conditioning system comprises a compressor and an outdoor fan, and the method comprises the following steps:

detecting a target frequency interval in which the current operating frequency is located and a neighboring frequency interval of the target frequency interval, wherein the target frequency interval is one of a plurality of preset frequency intervals, and the neighboring frequency interval refers to a preset frequency interval in which the corresponding minimum frequency is greater than the corresponding maximum frequency of the target frequency interval;

acquiring a preset target rotating speed corresponding to the adjacent frequency interval;

inquiring a preset relation curve to obtain the current back electromotive force corresponding to the current operating frequency;

acquiring the peak voltage of the air conditioning system;

determining an initial shutdown frequency and a preset shutdown frequency smaller than the initial shutdown frequency according to the peak voltage and the current back electromotive force;

and if the current operating frequency is greater than the preset shutdown frequency, adjusting the current rotating speed of the outdoor fan until the current rotating speed of the outdoor fan reaches the preset target rotating speed corresponding to the adjacent frequency interval, and controlling the compressor to be shut down after a preset time.

2. The method of claim 1, wherein the current operating parameters further include a current bus voltage and a current back electromotive force, and if the current operating frequency is greater than a preset shutdown frequency, the current rotational speed of the outdoor fan is adjusted until the current rotational speed of the outdoor fan reaches a preset target rotational speed corresponding to the adjacent frequency interval, and the shutdown of the compressor is controlled after a preset time, including:

if the difference between the preset safe voltage and the current bus voltage is smaller than the current back electromotive force and the current operating frequency is larger than the preset shutdown frequency, adjusting the current rotating speed of the outdoor fan according to the current operating parameters until the current rotating speed of the outdoor fan reaches a preset target rotating speed, and controlling the compressor to be shut down after a preset time.

3. The method of claim 2, wherein if the difference between the preset safe voltage and the current bus voltage is smaller than the current back electromotive force, and the current operating frequency is greater than a preset shutdown frequency, adjusting the current rotational speed of the outdoor fan according to the current operating parameter until the current rotational speed of the outdoor fan reaches a preset target rotational speed, and controlling the compressor to shutdown after a preset time, includes:

and if the difference between the preset safe voltage and the adjusted bus voltage is smaller than the current back electromotive force and the current operating frequency is greater than the preset shutdown frequency, adjusting the current rotating speed of the outdoor fan until the current rotating speed of the outdoor fan reaches the preset safe rotating speed, and controlling the compressor to be shut down after the preset time, wherein the preset safe rotating speed is the rotating speed of the outdoor fan when the difference between the preset safe voltage and the bus voltage is greater than the current back electromotive force.

4. The method for controlling the compressor according to claim 1, wherein if the current operating frequency is greater than a preset shutdown frequency, the current rotation speed of the outdoor fan is adjusted until the current rotation speed of the outdoor fan reaches a preset target rotation speed, and the compressor is controlled to be shutdown after a preset time, and the method includes:

and adjusting the current rotating speed of the outdoor fan according to the control signal, and controlling the compressor to stop after a preset time until the current rotating speed of the outdoor fan reaches a preset target rotating speed.

5. The method for controlling the compressor according to claim 1, wherein if the current operating frequency is greater than a preset shutdown frequency, the current rotation speed of the outdoor fan is adjusted until the current rotation speed of the outdoor fan reaches a preset target rotation speed, and the compressor is controlled to be shutdown after a preset time, and the method includes:

if the current operating frequency is greater than a preset shutdown frequency, adjusting the current rotating speed of the outdoor fan until the current rotating speed of the outdoor fan reaches a preset target rotating speed, and detecting the pressure of an exhaust port and the pressure of an air suction port of the compressor;

if the difference between the pressure of the exhaust port and the pressure of the air suction port is smaller than a preset pressure value, controlling the compressor to stop after a preset time;

or if the difference between the pressure of the exhaust port and the pressure of the air suction port is greater than the preset pressure value, reducing the current operation frequency of the compressor until the current operation frequency reaches the preset frequency, and controlling the compressor to stop after a preset time.

6. A compressor control apparatus, characterized by comprising:

an adjusting unit, configured to detect a target frequency interval in which the current operating frequency is located and a neighboring frequency interval of the target frequency interval, where the target frequency interval is one of a plurality of preset frequency intervals, and the neighboring frequency interval is a preset frequency interval in which a corresponding minimum frequency is greater than a corresponding maximum frequency of the target frequency interval;

acquiring the peak voltage of the air conditioning system;

7. An air conditioning system comprising a processor and a memory, the memory having a computer program stored therein, the processor executing the compressor control method according to any one of claims 1 to 5 when calling the computer program in the memory.

8. A computer-readable storage medium, having stored thereon a computer program which is loaded by a processor for performing the steps in the compressor control method according to any one of claims 1 to 5.