CN109724320A - Compressor of air conditioner method for controlling number of revolution and device - Google Patents
Compressor of air conditioner method for controlling number of revolution and device Download PDFInfo
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Abstract
The invention discloses a kind of compressor of air conditioner method for controlling number of revolution and devices, the described method includes: obtaining the output angular velocity of the phaselocked loop adjuster of compressor rotary speed control, the difference of the output angular velocity of target angular velocity undulate quantity and the phaselocked loop adjuster is calculated, the first angular speed difference is obtained；The first angular speed difference is filtered, acquisition at least filters out the filtering angular speed after the angular velocity fluctuation of part；It is input to the velocity loop regulator in compressor control speed ring using the filtering angular speed as input quantity, obtains the output torque of the velocity loop regulator；Compressor of air conditioner is controlled according to the output torque.With the application of the invention, can be improved the validity of compressor of air conditioner fluctuation of speed inhibition.
Description
Technical field
The invention belongs to air conditioner controlling technology fields, specifically, being to be related to compressor of air conditioner control technology, more specifically
It says, is to be related to compressor of air conditioner method for controlling number of revolution and device.
Background technique
The compressor that existing air-conditioning uses at runtime, by itself working principle of the air-conditioning as load and control technology
Influence easily cause the biggish fluctuation of speed so that the load torque of compressor is extremely unstable, compressor operation is uneven
Surely.And compressor operation it is unstable will lead to entire air-conditioner system fluctuation of service, cause a variety of adverse effects.And it is unstable
Operation can also generate biggish operation noise, be not able to satisfy coherent noise standard requirements, influence air conditioner comfort.This
Kind phenomenon is particularly acute in single-rotor compressor.
Although there is also the methods that compressor rotary speed controls for the prior art, the inhibition of compressor rotary speed fluctuation is carried out,
It is that fluctuation inhibitory effect is not ideal enough, cannot fundamentally solves the problems, such as that compressor rotary speed fluctuates.
Summary of the invention
The object of the present invention is to provide a kind of compressor of air conditioner method for controlling number of revolution and device, improve to compressor rotary speed into
The dynamic validity inhibited of traveling wave.
For achieving the above object, method provided by the invention, which adopts the following technical solutions, is achieved:
A kind of compressor of air conditioner method for controlling number of revolution, which comprises
Obtain compressor rotary speed control phaselocked loop adjuster output angular velocity, calculate target angular velocity undulate quantity with
The difference of the output angular velocity of the phaselocked loop adjuster obtains the first angular speed difference；
The first angular speed difference is filtered, the filtering angle speed after at least filtering out part angular velocity fluctuation is obtained
Degree；
It is input to the velocity loop regulator in compressor control speed ring using the filtering angular speed as input quantity, is obtained
Obtain the output torque of the velocity loop regulator；
Compressor of air conditioner is controlled according to the output torque；
Described that the first angular speed difference is filtered, acquisition at least filters out the filtering after the angular velocity fluctuation of part
Angular speed specifically includes:
Part angular velocity fluctuation in the first angular speed difference is extracted using velocity perturbation extraction algorithm, extracts institute
State the flip-flop of part angular velocity fluctuation, calculate the direct current of the first angular speed difference and the part angular velocity fluctuation at
The difference divided, the difference are determined as the filtering angular speed.
Further, described that the speed of segment angle in the first angular speed difference is extracted using velocity perturbation extraction algorithm
Degree fluctuation, specifically includes:
Using velocity perturbation extraction algorithm, the first harmonic ingredient in the first angular speed difference is at least extracted, is made
For the part angular velocity fluctuation.
Preferably, described to use velocity perturbation extraction algorithm, extract the first harmonic in the first angular speed difference
Ingredient specifically includes:
The first angular speed difference is made into Fourier expansion, obtains the function expression about mechanical angle；
Extract the d axis component and q axis component of first harmonic respectively from the function expression；
The d axis component of the first harmonic is added with q axis component, is obtained primary humorous in the first angular speed difference
Wave component.
Further, described that the speed of segment angle in the first angular speed difference is extracted using velocity perturbation extraction algorithm
Degree fluctuation, further includes: velocity perturbation extraction algorithm is used, the second harmonic ingredient in the first angular speed difference is extracted,
It regard the sum of the first harmonic ingredient and the second harmonic ingredient as the part angular velocity fluctuation.
Preferably, described to use velocity perturbation extraction algorithm, extract the second harmonic in the first angular speed difference
Ingredient specifically includes:
The first angular speed difference is made into Fourier expansion, obtains the function expression about mechanical angle；
Extract the d axis component and q axis component of second harmonic respectively from the function expression；
The d axis component of the second harmonic is added with q axis component, is obtained secondary humorous in the second angular speed difference
Wave component.
Method as described above, further includes: compressor control is determined according to the output angular velocity of the phaselocked loop adjuster
Real-time angular speed controls compressor of air conditioner according to the real-time angular speed.
Method as described above, the target angular velocity undulate quantity are 0；The output according to the phaselocked loop adjuster
Angular speed determines the real-time angular speed of compressor control, specifically includes: by the output angular velocity of the phaselocked loop adjuster with
Given angular speed, which instructs, to be added, and the result of addition is determined as the real-time angular speed.
To realize aforementioned invention purpose, device provided by the invention, which adopts the following technical solutions, to be achieved:
A kind of compressor of air conditioner revolution speed control device, described device include:
First angular speed difference acquiring unit, the output angle of the phaselocked loop adjuster for obtaining compressor rotary speed control
Speed calculates the difference of the output angular velocity of target angular velocity undulate quantity and the phaselocked loop adjuster, obtains the first angular velocity difference
Value；
Angular speed acquiring unit is filtered, for the first angular speed difference to be filtered, acquisition at least filters out portion
Filtering angular speed after subangle velocity perturbation；
Output torque acquiring unit, for being input to compressor control speed using the filtering angular speed as input quantity
Velocity loop regulator in ring obtains the output torque of the velocity loop regulator；
Control unit, for controlling compressor of air conditioner according at least to the output torque；
The first angular speed difference is filtered in the filtering angular speed acquiring unit, and acquisition at least filters out part
Filtering angular speed after angular velocity fluctuation, specifically includes:
Part angular velocity fluctuation in the first angular speed difference is extracted using velocity perturbation extraction algorithm, extracts institute
State the flip-flop of part angular velocity fluctuation, calculate the direct current of the first angular speed difference and the part angular velocity fluctuation at
The difference divided, the difference are determined as the filtering angular speed.
Device as described above, further includes:
Real-time angular speed acquiring unit, for determining compressor control according to the output angular velocity of the phaselocked loop adjuster
Real-time angular speed；
Described control unit controls compressor of air conditioner also according to the real-time angular speed.
Compared with prior art, the advantages and positive effects of the present invention are: compressor of air conditioner revolving speed control provided by the invention
Method and device processed, by making the difference of the output angular velocity of phaselocked loop adjuster and target angular velocity undulate quantity at filtering
Reason will at least filter out the filtering angular speed after the angular velocity fluctuation of part and be input in velocity loop regulator as input quantity, can
The fluctuation for reducing the output torque of velocity loop regulator, when controlling compressor according to output torque, it is possible to reduce compressor turns
Speed fluctuation, so that compressor operation is more stable；Compressor operation is stablized, moreover it is possible to achieve the effect that energy conservation, vibration damping.
After a specific embodiment of the invention is read in conjunction with the figure, the other features and advantages of the invention will become more clear
Chu.
Detailed description of the invention
Fig. 1 is the flow chart based on compressor of air conditioner method for controlling number of revolution one embodiment of the present invention；
Fig. 2 is a control block diagram based on Fig. 1 embodiment of the method；
Fig. 3 is the logic diagram of one specific embodiment of velocity perturbation extraction algorithm in Fig. 2；
Fig. 4 is the structural block diagram based on compressor of air conditioner revolution speed control device one embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to drawings and examples,
Invention is further described in detail.
Referring to Figure 1, which show the process based on compressor of air conditioner method for controlling number of revolution one embodiment of the present invention
Figure.
As shown in Figure 1, in combination with Fig. 2 shows a control block diagram, the embodiment is using including following step
Process realizes the control of compressor of air conditioner revolving speed:
Step 11: obtaining the output angular velocity of the phaselocked loop adjuster of compressor rotary speed control, calculate target angular velocity
The difference of undulate quantity and the output angular velocity of phaselocked loop adjuster obtains the first angular speed difference.
In compressor control, the revolving speed of compressor drum can be controlled by speed ring (ASR) control technology,
It is close to setting speed.Shown in block diagram referring to fig. 2, speed ring includes velocity loop regulator, generally proportional integration tune
Device is saved, sees the K of Fig. 2P_ASRAnd KI_ASR/S.In compressor control, also compressor is turned by phaselocked loop (PLL) control technology
The phase of son is locked, it is made to be locked in target phase.It include lock shown in block diagram referring to fig. 2, in compressor phaselocked loop
Phase ring adjuster is also generally proportional and integral controller, sees the K of Fig. 2P_PLLAnd KI_PLL/S.Axis error Δ θ is as phaselocked loop tune
An input for saving device uses, specifically, be by axis error Δ θ and target angle undulate quantity (0) work as shown in Figure 2 is poor,
Difference is input to phaselocked loop adjuster, and the output of phaselocked loop adjuster is output angular velocity Δ ω _ PLL.
In this step, output angular velocity Δ ω _ PLL of phaselocked loop adjuster is obtained first；Then, target angle speed is calculated
The difference of output angular velocity Δ ω _ PLL of undulate quantity and phaselocked loop adjuster is spent, the difference of the two is determined as the first angular speed difference
Δω2.Wherein, target angular velocity undulate quantity is desired angular velocity fluctuation amount, is known input quantity.As preferred implementation side
Formula, in this embodiment, target angular velocity undulate quantity are 0.
Step 12: the first angular speed difference being filtered, acquisition at least filters out the filtering after the angular velocity fluctuation of part
Angular speed.
Input of the first angular speed difference as velocity loop regulator influences the output torque of speed ring output.If the
The fluctuation of one angular speed difference is big, it will causes output torque fluctuation big, so that compressor rotary speed fluctuation is big.It is obtained in step 11
After obtaining the first angular speed difference, it is filtered, at least filters out part angular velocity fluctuation ingredient, obtains filtering angular speed
Δω_K。
Specifically, referring to fig. 2 shown in block diagram, the first angular speed difference DELTA ω 2 is filtered, is at least filtered out
Filtering angular speed Δ ω _ K after the angular velocity fluctuation of part, specifically includes: extracting first jiao using velocity perturbation extraction algorithm
Part angular velocity fluctuation K_out in speed difference Δ ω 2, extracts the flip-flop K_DC of part angular velocity fluctuation K_out；
Then, the difference of the first angular speed difference DELTA ω 2 and the flip-flop K_DC of part angular velocity fluctuation is calculated, which is determined as
Filter angular speed Δ ω _ K.Wherein, the flip-flop K_DC for extracting segment angle velocity perturbation K_out, can use existing extraction
The technology of flip-flop is realized, for example, the flip-flop K_ of part angular velocity fluctuation K_out is extracted using low-pass filter
DC.Preferred filtering processing mode, referring to the description of subsequent preferred embodiments.
Step 13: filtering angular speed being input to the speed ring in compressor control speed ring as input quantity and is adjusted
Device obtains the output torque τ of velocity loop regulatorM。
Step 14: compressor of air conditioner is controlled according to output torque.Specific control process refers to the prior art.
Using the method for above-described embodiment, by by the output angular velocity of phaselocked loop adjuster and target angular velocity undulate quantity
Difference be filtered, will at least filter out the filtering angular speed after the angular velocity fluctuation of part and be input to speed ring as input quantity
In adjuster, the fluctuation of the output torque of velocity loop regulator can reduce, it, can be with when controlling compressor according to output torque
Compressor rotary speed fluctuation is reduced, the operation of compressor is made to tend to be steady.
In some other embodiment, compressor of air conditioner revolving speed is controlled, further includes according to phaselocked loop adjuster
Output angular velocity Δ ω _ PLL determines the real-time angular velocity omega 1 of compressor control, and controls air-conditioning according to real-time angular velocity omega 1
Compressor.Specifically, in this embodiment, it is fluctuated as a preferred implementation manner, in the target angular velocity of speed ring ASR
In the case that amount is 0, the real-time angle speed of compressor control is determined according to output angular velocity Δ ω _ PLL of phaselocked loop adjuster
ω 1 is spent, is specifically included: output angular velocity Δ ω _ PLL of phaselocked loop adjuster and given angular speed are instructed into ω*_ in phase
Add, the result of addition is determined as real-time angular velocity omega 1.Wherein, angular speed instructs ω*_ in is the given of compressor control system
Magnitude of angular velocity, given angular speed instruct ω*The determination method of the value of _ in is realized using the prior art.In preferred implementation side
In formula, use the target angular velocity undulate quantity of speed ring for 0, based on output angular velocity Δ ω _ PLL of phaselocked loop adjuster with to
Fixed angular speed instructs ω*_ in determines real-time angular speed, so that compressor control is more accurate and stablizes.
In some other preferred embodiment, the portion in the first angular speed difference is extracted using velocity perturbation extraction algorithm
Subangle velocity perturbation, specifically includes: using velocity perturbation extraction algorithm, at least extracts primary humorous in the first angular speed difference
Wave component, as part angular velocity fluctuation.A kind of embodiment more preferably, is extracted using velocity perturbation extraction algorithm
Part angular velocity fluctuation in first angular speed difference, specifically includes: using velocity perturbation extraction algorithm, extracts first jiao of speed
The first harmonic ingredient and second harmonic ingredient in difference are spent, regard the sum of first harmonic ingredient and second harmonic ingredient as part
Angular velocity fluctuation.By extracting flip-flop, or extraction again after extracting the first harmonic ingredient in the first angular speed difference
Extract flip-flop again after the first harmonic ingredient and second harmonic ingredient in the first angular speed difference out, with the first angular speed
After difference makees difference, most of ripple components in the first angular speed difference can be filtered out, and calculation amount is moderate, filters out speed
Fastly.
Fig. 3 shows the logic diagram of one specific example of velocity perturbation extraction algorithm in Fig. 2, is from specifically
First harmonic ingredient and second harmonic ingredient, a specific reality for forming segment angle velocity perturbation are extracted in one angular speed difference
The logic diagram of example.Referring to Fig. 3, the specific example using following methods acquisition include first harmonic ingredient and second harmonic at
The part angular velocity fluctuation divided:
Firstly, the first angular speed difference DELTA ω 2 is made Fourier expansion, obtains the first angular speed difference DELTA ω 2 and close
In mechanical angle θmFunction expression.The process can be realized using the prior art, be not described in detail here.
Then, first harmonic ingredient and second harmonic ingredient are extracted respectively from function expression.
Specifically, as shown in figure 3, by function expression and cos θm1After multiplication, pass through low-pass filterIt is filtered, filter result makees inverse Fourier transform, obtains the d axis component of first harmonic；By function expression
With-sin θm1After multiplication, pass through low-pass filterIt is filtered, filter result makees inverse Fourier transform, obtains
The q axis component of first harmonic；Then, the d axis component of first harmonic is added with q axis component, is obtained in the first angular speed difference
First harmonic ingredient K_out1.Likewise, by function expression and cos θm2After multiplication, pass through low-pass filterIt is filtered, filter result makees inverse Fourier transform, obtains the d axis component of second harmonic；By function expression
With-sin θm2After multiplication, pass through low-pass filterIt is filtered, filter result makees inverse Fourier transform, obtains
The q axis component of second harmonic；Then, the d axis component of second harmonic is added with q axis component, is obtained in the first angular speed difference
Second harmonic ingredient K_out2.Finally, first harmonic ingredient K_out1 is added with second harmonic ingredient K_out2, it is resulting
With formation segment angle velocity perturbation K_out.Wherein, θm1It is mechanical for the first harmonic in the function expression of Fourier expansion
Angle, θm2For the second harmonic mechanical angle in the function expression of Fourier expansion, and θm2=2 θm1, T_PD_filterFor low pass
Filter time constant.
After obtaining the part angular velocity fluctuation K_out comprising first harmonic ingredient and second harmonic ingredient, first is calculated
The difference of angular speed difference DELTA ω 2 and part angular velocity fluctuation K_out then filters angular speed as filtering angular speed Δ ω _ K
Δ ω _ K is the filtering angular speed filtered out after first harmonic ingredient and second harmonic ingredient.
Preferably, the control extracted to harmonic wave can also be realized by increasing enabled switch.Specifically,
In Fig. 3 block diagram, Gain_1, Gain_2 are enabled switch, are used to determine whether unlatching/closing extraction algorithm function.In Gain_
1, the enabled switch state of Gain_2 is to obtain primary humorous in the case where opening extraction first harmonic and extracting second harmonic function
The part angular velocity fluctuation that wave component and second harmonic ingredient are constituted: K_out=K_out1+K_out2.If Gain_1, Gain_2
Enabled switch state be in the case where closing and extracting first harmonic and extract second harmonic function, entire velocity perturbation, which is extracted, calculates
Method function will close, and part angular velocity fluctuation is 0.If one of them enabled switch state is to open extraction algorithm function, separately
For one enabled switch to close extraction algorithm function, then the part angular velocity fluctuation obtained is only one in the first angular speed difference
(the enabled switch state of Gain_1 is unlatching extraction first harmonic function to subharmonic ingredient, the enabled switch state of Gain_2 is closing
The case where extracting second harmonic function) or only the first angular speed difference in second harmonic ingredient (the enabled switch of Gain_1
State is to close to extract the case where enabled switch state of first harmonic function, Gain_2 is unlatching extraction second harmonic function).
In the embodiment for only extracting first harmonic ingredient, the mistake that first harmonic ingredient is extracted in Fig. 3 can be directly used
Journey；Certainly, also the control extracted to first harmonic can also be realized by increasing enabled switch, specific implementation is referring also to figure
3, it does not in addition repeat herein.
Fig. 4 is referred to, which show the structure based on compressor of air conditioner revolution speed control device one embodiment of the present invention
Block diagram.
As shown in figure 4, the function of connection relationship and unit included by the device of the embodiment between structural unit, unit
It can be as follows:
First angular speed difference acquiring unit 21, the output of the phaselocked loop adjuster for obtaining compressor rotary speed control
Angular speed calculates the difference of the output angular velocity of target angular velocity undulate quantity and phaselocked loop adjuster, obtains the first angular speed difference.
Filter angular speed acquiring unit 22, the first angular velocity difference for obtaining to the first angular speed difference acquiring unit 21
Value is filtered, and acquisition at least filters out the filtering angular speed after the angular velocity fluctuation of part.
Output torque acquiring unit 23 is used as input for that will filter the filtering angular speed that angular speed acquiring unit 22 obtains
The velocity loop regulator being input in compressor control speed ring is measured, the output torque of velocity loop regulator is obtained.
Control unit 24 controls compressor of air conditioner for the output torque according at least to output torque acquiring unit 23.
In some other embodiment, compressor rotary speed control device can also include real-time angular speed acquiring unit
25, for determining the real-time angular speed of compressor control according to the output angular velocity of phaselocked loop adjuster.In these embodiments
In, control unit 24 is in addition to controlling compressor of air conditioner according to the output torque of output torque acquiring unit 23, also according to real-time angle
The real-time angular speed that speed acquiring unit 25 determines controls compressor.
Device with above-mentioned each structural unit, can apply in compressor of air conditioner product, run corresponding software journey
Sequence, the process of embodiment and preferred embodiment works according to the method described above, the inhibition that compressor rotary speed is fluctuated in realization, in acquisition
State technical effect possessed by embodiment of the method.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although referring to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of compressor of air conditioner method for controlling number of revolution, which is characterized in that the described method includes:
Obtain compressor rotary speed control phaselocked loop adjuster output angular velocity, calculate target angular velocity undulate quantity with it is described
The difference of the output angular velocity of phaselocked loop adjuster obtains the first angular speed difference；
The first angular speed difference is filtered, acquisition at least filters out the filtering angular speed after the angular velocity fluctuation of part；
It is input to the velocity loop regulator in compressor control speed ring using the filtering angular speed as input quantity, obtains institute
State the output torque of velocity loop regulator；
Compressor of air conditioner is controlled according to the output torque；
It is described that the first angular speed difference is filtered, obtain the filtering angle speed after at least filtering out part angular velocity fluctuation
Degree, specifically includes:
Part angular velocity fluctuation in the first angular speed difference is extracted using velocity perturbation extraction algorithm, extracts the portion
The flip-flop of subangle velocity perturbation calculates the flip-flop of the first angular speed difference and the part angular velocity fluctuation
Difference, the difference are determined as the filtering angular speed.
2. the method according to claim 1, wherein described extract described the using velocity perturbation extraction algorithm
Part angular velocity fluctuation in one angular speed difference, specifically includes:
Using velocity perturbation extraction algorithm, the first harmonic ingredient in the first angular speed difference is at least extracted, as institute
State part angular velocity fluctuation.
3. according to the method described in claim 2, it is characterized in that, the use velocity perturbation extraction algorithm, extracts described
First harmonic ingredient in first angular speed difference, specifically includes:
The first angular speed difference is made into Fourier expansion, obtains the function expression about mechanical angle；
Extract the d axis component and q axis component of first harmonic respectively from the function expression；
The d axis component of the first harmonic is added with q axis component, obtain first harmonic in the first angular speed difference at
Point.
4. according to the method described in claim 2, it is characterized in that, described extract described the using velocity perturbation extraction algorithm
Part angular velocity fluctuation in one angular speed difference, further includes: use velocity perturbation extraction algorithm, extract first jiao of speed
The second harmonic ingredient in difference is spent, regard the sum of the first harmonic ingredient and the second harmonic ingredient as the segment angle
Velocity perturbation.
5. according to the method described in claim 4, it is characterized in that, the use velocity perturbation extraction algorithm, extracts described
Second harmonic ingredient in first angular speed difference, specifically includes:
The first angular speed difference is made into Fourier expansion, obtains the function expression about mechanical angle；
Extract the d axis component and q axis component of second harmonic respectively from the function expression；
The d axis component of the second harmonic is added with q axis component, obtain second harmonic in the second angular speed difference at
Point.
6. the method according to any one of claims 1 to 5, which is characterized in that the method also includes: according to the lock
The output angular velocity of phase ring adjuster determines the real-time angular speed of compressor control, controls air-conditioning according to the real-time angular speed
Compressor.
7. according to the method described in claim 6, it is characterized in that, the target angular velocity undulate quantity is 0；It is described according to
The output angular velocity of phaselocked loop adjuster determines the real-time angular speed of compressor control, specifically includes: by the phaselocked loop tune
The output angular velocity for saving device is added with given angular speed instruction, and the result of addition is determined as the real-time angular speed.
8. a kind of compressor of air conditioner revolution speed control device, which is characterized in that described device includes:
First angular speed difference acquiring unit, the output angle speed of the phaselocked loop adjuster for obtaining compressor rotary speed control
Degree calculates the difference of the output angular velocity of target angular velocity undulate quantity and the phaselocked loop adjuster, obtains the first angular speed difference；
Angular speed acquiring unit is filtered, for the first angular speed difference to be filtered, acquisition at least filters out segment angle
Filtering angular speed after velocity perturbation；
Output torque acquiring unit, for being input in compressor control speed ring using the filtering angular speed as input quantity
Velocity loop regulator, obtain the output torque of the velocity loop regulator；
Control unit, for controlling compressor of air conditioner according at least to the output torque；
The first angular speed difference is filtered in the filtering angular speed acquiring unit, and acquisition at least filters out segment angle speed
Filtering angular speed after degree fluctuation, specifically includes:
Part angular velocity fluctuation in the first angular speed difference is extracted using velocity perturbation extraction algorithm, extracts the portion
The flip-flop of subangle velocity perturbation calculates the flip-flop of the first angular speed difference and the part angular velocity fluctuation
Difference, the difference are determined as the filtering angular speed.
9. device according to claim 8, which is characterized in that described device further include:
Real-time angular speed acquiring unit, for determining compressor control according to the output angular velocity of the phaselocked loop adjuster
Real-time angular speed；
Described control unit controls compressor of air conditioner also according to the real-time angular speed.
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| CN201811529668.XA CN109724320B (en) | 2018-12-13 | 2018-12-13 | Air conditioner compressor rotating speed control method and device |
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| CN114320919A (en) * | 2021-12-31 | 2022-04-12 | 青岛海尔空调电子有限公司 | Air conditioner and compressor control method thereof |
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