CN113865062B - Control method of variable frequency air conditioner - Google Patents
Control method of variable frequency air conditioner Download PDFInfo
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- CN113865062B CN113865062B CN202111199615.8A CN202111199615A CN113865062B CN 113865062 B CN113865062 B CN 113865062B CN 202111199615 A CN202111199615 A CN 202111199615A CN 113865062 B CN113865062 B CN 113865062B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a control method of a variable frequency air conditioner, which comprises the following steps: s1, starting the variable frequency air conditioner, and reading a real-time value X of a system operation parameter X n (ii) a S2, judging whether the frequency reduction times n or the shutdown times m of the air conditioner triggered by the parameter X in a period of time T1 meet a preset standard, if so, continuing to execute the step S3; if not, the variable frequency air conditioner maintains the current state to continue running; s3, correcting the threshold value of the parameter X, and enabling the air conditioner to enter a protection parameter correction mode; and S4, the air conditioner operates in a protection parameter correction mode, and the control method of the variable frequency air conditioner can realize self-adaptive control, avoid frequent frequency increase and decrease or startup and shutdown, improve the operation stability and reliability of the variable frequency air conditioner and prolong the service life of the variable frequency air conditioner.
Description
Technical Field
The invention relates to the field of air conditioning equipment, in particular to a control method of a variable frequency air conditioner.
Background
The variable frequency air conditioner has the advantages of energy saving and comfort because the running frequency of the variable frequency air conditioner can be automatically adjusted according to the change of indoor load, and becomes a mainstream product in the current market. In addition, the frequency conversion air conditioner can also automatically carry out frequency reduction operation on the compressor under severe working conditions or when certain operation parameters are protected due to objective factors, so that the system parameters are ensured to operate within a reasonable range, the reliability of the whole machine is greatly improved, and the service life of the whole machine is greatly prolonged.
However, the inverter control logic of the present inverter air conditioner is still imperfect, and particularly when the inverter air conditioner is protected by some hysteresis operation parameters, such as exhaust temperature, coil temperature, etc., although the compressor can be operated in a frequency-reducing mode, after a period of time, the protection is released, and after the frequency of the compressor is increased, the compressor can be triggered to operate in a frequency-reducing mode or even stop, and then the periodic frequency-increasing, frequency-reducing mode or start and stop are continuously performed, so that the system cannot be adaptively stable to operate, which not only has great impact on the air conditioning system, but also has great influence on user comfort.
The present application is proposed to solve the above technical problems.
Disclosure of Invention
The invention designs a control method of a variable frequency air conditioner, which aims to solve the problem that an air conditioning system cannot be self-adapted to achieve stable operation due to periodic rising, falling frequency or starting and stopping of the conventional variable frequency air conditioner after the protection triggered by operation parameters occurs.
In order to solve the problems, the invention discloses a control method of a variable frequency air conditioner, which comprises the following steps:
s1, starting the variable frequency air conditioner, and reading a real-time value X of a system operation parameter X n ；
S2, judging whether the frequency reduction times n or the shutdown times m of the air conditioner triggered by the parameter X meet a preset standard within a period of time T1, if so, continuing to execute the step S3; if not, the variable frequency air conditioner maintains the current state to continue running;
s3, correcting the threshold value of the parameter X, and enabling the air conditioner to enter a protection parameter correction mode;
and S4, the air conditioner operates in a protection parameter correction mode.
According to the method and the device, whether the frequency reduction times n and the shutdown times m of the air conditioner triggered by the parameters X meet the preset standard or not is judged within a period of time T1, and the air conditioner can enter a protection parameter correction mode when the preset standard is met, so that the frequency reduction or shutdown caused by accidental factors can be eliminated, the fault tolerance rate of a system is guaranteed, and the control accuracy is improved. And furthermore, after the frequency reduction times n or the shutdown times m of the air conditioner triggered by the parameter X meet a preset standard, correcting the threshold value of the parameter X to enable the air conditioner to enter a protection parameter correction mode and operate in the protection parameter correction mode, so that the air conditioner is prevented from frequently performing frequency increase and frequency reduction or starting and stopping, and the variable frequency air conditioner is enabled to realize self-adaption and achieve the purpose of stable operation.
Further, the parameter X is an operation parameter having hysteresis with the frequency change of the compressor in the inverter air conditioner.
In the existing inverter air conditioner protection logic, the air conditioner is protected on the basis of the operation parameter with hysteresis property in the frequency change of the compressor.
Further, the parameter X is a compressor discharge temperature, a coil temperature, or a controller module temperature.
The compressor exhaust temperature, the coil temperature or the controller module temperature have hysteresis with the compressor frequency change, the change speed is slower than the compressor frequency, and the hysteresis can be used as the specific value of the parameter X.
Further, the step S2 includes: judging whether the frequency reduction times N of the variable-frequency air conditioner triggered by the parameter X are more than or equal to N1 or not within a period of time T1 or whether the frequency stop times M of the variable-frequency air conditioner triggered by the parameter X are more than or equal to M1 or not, wherein N1 and M1 are preset values; if yes, continuing to execute the step S3; if not, the air conditioner keeps the current state to continue running.
By judging the frequency reduction times n or the shutdown times m of the variable-frequency air conditioner triggered by the parameter X, the frequency reduction or shutdown caused by accidental factors can be eliminated, the fault tolerance of the system is ensured, and the control accuracy is improved.
Furthermore, the value range of N1 is 2-4, and the value range of M1 is 1-2.
The value range of N1 is set to be 2-4, the value range of M1 is set to be 1-2, the frequency reduction or shutdown caused by accidental factors can be eliminated, the fault tolerance of the system is ensured, the control accuracy is improved, and the frequency of the frequency reduction or shutdown of the air conditioner is controlled to be a lower value.
Further, the step S3 includes: and acquiring the frequency reduction times n of the variable-frequency air conditioner triggered by the parameter X in the step S2 and the value of the stop times m of the variable-frequency air conditioner triggered by the parameter X, and correcting the threshold value of the parameter X by using the values of n and m to enable the air conditioner to enter a protection parameter correction mode.
And correcting the threshold value of the parameter X through the values of n and m, so that the threshold value of the parameter X in the protection parameter correction mode is related to the running state of the air conditioner before entering the protection parameter correction mode, and the threshold value of the parameter X is corrected by combining the running state of the air conditioner before entering the protection parameter correction mode, so that the method is more accurate and higher in applicability.
Further, the threshold of the parameter X is corrected by using the values of n and m through the following formula:
X limit of n ＝X Limit of 0 –n*A-m*B；
X Decreasing n ＝X Reduce 0 –m*C；
Wherein X Limit of 0 For an initial frequency-limiting value of a pre-corrected, system-preset parameter X, X Reduce 0 For the initial frequency reduction value of a pre-corrected, system-preset parameter X, X Limit of n For the frequency-limited value of the modified parameter X, X Lowering n The corrected frequency reduction value of the parameter X is obtained, and n is the frequency reduction frequency of the variable frequency air conditioner triggered by the parameter X in the step S2; m is the frequency conversion air conditioner shutdown frequency triggered by the parameter X in the step S2; A. b and C are preset values.
For a threshold value of a parameter X, e.g. X Limit of 0 And X Reduce 0 The principle of correction is as follows: according to the hysteresis characteristic of the parameter X, at the initial and preset threshold value X of the system Limit of 0 And X Reduce 0 The frequency limiting method has the advantages that the reduction compensation is carried out to a certain degree on the basis, so that the protection has lead, the frequency limiting condition can be triggered to carry out frequency limiting before the frequency of the compressor is increased, and the corrected frequency reduction value X is not easy to trigger again the system operation parameter after the frequency of the compressor is reduced Decreasing n It is used. Even if the air conditioner triggers the corrected down frequency value X again Lowering n Then the system will again down convert value X Lowering n The correction is carried out, so that the correction amount is increased, the system is protected earlier, the air conditioner system is prevented from frequently increasing, reducing the frequency or stopping, and the operation stability of the air conditioner is improved.
Further, the initial frequency limiting value X of the parameter X preset by the system Limit of 0 Modified amplitude (n × a + m × B) > initial frequency reduction value X for a parameter X preset by the system Reduce 0 The correction amplitude (m × C) of (d).
The initial frequency limiting value X of the parameter X preset for the system Limit of 0 Correction width of (2)Degree (n × a + m × B) > above-mentioned initial frequency reduction value X for the parameter X preset by the system Decrease 0 By this, the corrected frequency limit value X can be increased Limit of n And the down-conversion value X Lowering n The difference between them, giving the system a longer reaction time.
Further, the step S4 specifically includes: when the air conditioner runs in a protection parameter correction mode, frequency limiting values X of corrected parameters X are respectively obtained Limit of n And the down-conversion value X Lowering n And a shutdown value X of a parameter X preset by the system Stop And the running state of the air conditioner is regulated and controlled according to the following processes:
s401, judging a real-time value X of the parameter X n Whether or not the stop value is greater than or equal to X Stop If yes, controlling a compressor of the variable frequency air conditioner to stop; if not, continuing to execute the step S402;
s402, judging the real-time value X of the parameter X n Whether or not it is greater than or equal to the down-conversion value X Lowering n If yes, controlling a compressor of the variable frequency air conditioner to perform frequency reduction operation; if not, continuing to execute the step S403;
s403, judging the real-time value X of the parameter X n Whether the frequency limit value is more than or equal to X Limit of n If yes, limiting the frequency increasing operation of a compressor of the variable frequency air conditioner; if not, the running state of the inverter air conditioner is maintained unchanged.
In said step S4, passing the real-time value X of the parameter X n And a shutdown value X Stop at Corrected down-conversion value X Lowering n And the corrected frequency limiting value X Limit of n The operation state of the variable frequency air conditioner is regulated and controlled according to the size relation, and the frequency rising, frequency reducing, starting and stopping of the variable frequency air conditioner are avoided through regulation and control, so that the operation state of the variable frequency air conditioner is more stable.
Further, after entering the protection parameter modification mode, the inverter air conditioner may further exit the protection parameter modification mode through the following procedures:
s5, acquiring a frequency reduction value and a frequency limiting value of a parameter X in the current system, and recording the frequency reduction value and the frequency limiting value as X Lowering n And X Limit of n (ii) a And obtaining initial frequency reduction of parameter X in the variable frequency air conditionerValue X Reduce 0 And an initial frequency limit value X Limit of 0 ；
S6, judging whether X is present Lowering n ＝X Decrease 0 And X Limit of n ＝X Limit of 0 If so, judging that the air conditioner does not enter the protection parameter correction mode, and keeping the air conditioner in the current state to continue to operate; if not, judging that the air conditioner enters the protection parameter correction mode, and continuing to execute the step S7;
s7, judging whether the air conditioner detects a shutdown signal or a power-off signal, if so, exiting the protection parameter correction mode, and restoring the frequency reduction value of the parameter X to the initial set value X Reduce 0 Restoring the frequency limit value of the parameter X to the initial set value X Limit of 0 (ii) a If not, continuing to execute the step S8;
s8, judging whether the real-time value X of the parameter X is continuously detected in the T2 time n Satisfy X n -X Lowering n Less than or equal to a preset threshold value Y; if yes, the protection parameter correction mode is exited, and the frequency reduction value of the parameter X is restored to the initial frequency reduction value X Reduce 0 Restoring the frequency limit value of the parameter X to the initial frequency limit value X Limit of 0 (ii) a If not, maintaining the frequency reduction value of the parameter X as X Lowering n The frequency limit value of the parameter X is X Limit of n And the inverter air conditioner is enabled to continuously run in the protection parameter correction mode.
Generally, the inverter air conditioner operates in a normal mode, and enters the protection parameter correction mode to operate only under severe working conditions, and the inverter air conditioner can automatically exit the protection parameter correction mode after the inverter air conditioner passes the severe working conditions through the steps S5 to S8, so that the air conditioner can continue to operate according to an initial set value X Reduce 0 And X Limit of 0 And the operation is carried out, the control process is optimized under the condition of not greatly increasing the cost, the operation stability and the reliability of the variable frequency air conditioner are improved, and the service life of the variable frequency air conditioner is prolonged.
The control method of the variable frequency air conditioner has the following advantages:
firstly, when the variable frequency air conditioner runs under a severe working condition and frequent rising, falling or starting and stopping occur, the control method of the variable frequency air conditioner can stabilize the running frequency of the compressor as soon as possible by automatically correcting the threshold value of the protection parameter X;
secondly, after entering the protection parameter correction mode, whether the variable frequency air conditioner exits or continues to operate according to the protection parameter correction mode can be judged according to actual working conditions, the variable frequency air conditioner can be matched with other working modes of the air conditioner, and the operation of the air conditioner under other working conditions cannot be influenced;
thirdly, under the effect of the control method of the variable frequency air conditioner, the variable frequency air conditioner can be controlled in a self-adaptive mode, frequent frequency rising and frequency falling or startup and shutdown are avoided, and the operation stability, reliability and service life of the variable frequency air conditioner are improved.
Drawings
FIG. 1 is a schematic diagram illustrating an operation state of an inverter air conditioner under a conventional protection logic;
FIG. 2 is a schematic diagram illustrating a control method of an inverter air conditioner according to the present invention;
FIG. 3 is another schematic diagram of a control method of an inverter air conditioner according to the present invention;
FIG. 4 is a schematic view of an operation state of an inverter air conditioner under the control of the inverter air conditioner control method according to the present invention;
fig. 5 is a schematic view of another operation state of the inverter air conditioner under the control of the inverter air conditioner control method according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 2 to 5, a method for controlling an inverter air conditioner includes the steps of:
s1, starting the variable frequency air conditioner, and reading a real-time value X of a system operation parameter X n ；
S2, judging whether the frequency reduction times n or the shutdown times m of the air conditioner triggered by the parameter X meet a preset standard within a period of time T1, if so, continuing to execute the step S3; if not, the variable frequency air conditioner maintains the current state and continues to operate;
s3, correcting the threshold value of the parameter X, and enabling the air conditioner to enter a protection parameter correction mode;
and S4, the air conditioner operates in a protection parameter correction mode.
Specifically, the method and the device can judge whether the frequency reduction times n and the shutdown times m of the air conditioner triggered by the parameters X meet the preset standard within a period of time T1, and the air conditioner can enter a protection parameter correction mode when the preset standard is met, so that the frequency reduction or shutdown caused by accidental factors can be eliminated, the fault tolerance rate of the system is ensured, and the control accuracy is improved. And furthermore, after the frequency reduction times n or the shutdown times m of the air conditioner triggered by the parameter X meet a preset standard, correcting the threshold value of the parameter X to enable the air conditioner to enter a protection parameter correction mode and operate in the protection parameter correction mode, so that the air conditioner is prevented from frequently performing frequency increase and frequency reduction or starting and stopping, and the variable frequency air conditioner is enabled to realize self-adaption and achieve the purpose of stable operation.
Further, the step S1 includes:
s101, starting up the variable frequency air conditioner to run;
s102, reading a real-time value X of the system operation parameter X n The parameter X is an operation parameter having hysteresis with frequency variation of the compressor in the inverter air conditioner, such as a discharge temperature of the compressor, a temperature of the coil, a temperature of the controller module, and the like.
Further, the step S2 specifically includes: judging whether the frequency reduction times N of the variable-frequency air conditioner triggered by the parameter X are more than or equal to N1 or not within a period of time T1 or whether the frequency stop times M of the variable-frequency air conditioner triggered by the parameter X are more than or equal to M1 or not, wherein N1 and M1 are preset values; if yes, continuing to execute the step S3; if not, the air conditioner keeps the current state to continue running.
Preferably, the value range of N1 is 2-4, and the value range of M1 is 1-2.
More preferably, the value of N1 is 2, and the value of M1 is 1.
By judging the frequency reduction times n or shutdown times m of the variable frequency air conditioner triggered by the parameter X, the frequency reduction or shutdown caused by accidental factors can be eliminated, the fault tolerance rate of the system is ensured, and the control accuracy is improved.
Further, the step S3 specifically includes: and acquiring the frequency reduction times n of the variable-frequency air conditioner triggered by the parameter X in the step S2 and the value of the stop times m of the variable-frequency air conditioner triggered by the parameter X, and correcting the threshold value of the parameter X by using the values of n and m to enable the air conditioner to enter a protection parameter correction mode.
Further, the threshold value of the parameter X may be modified by using the values of n and m according to the following formula:
X limit of n ＝X Limit of 0 –n*A-m*B；
X Decreasing n ＝X Decrease 0 –m*C；
Wherein, X is Limit of 0 For an initial frequency-limiting value of a pre-corrected, system-preset parameter X, X Decrease 0 When the air conditioner is in normal operation and is not in the protection parameter correction mode, the real-time value X of the parameter X is the initial frequency reduction value of the parameter X preset by the system before correction n To reach X Limit of 0 Then, the air conditioner limits the frequency of the compressor to continuously rise; when the real-time value X of the parameter X n To X Reduce 0 Then, the air conditioner reduces the frequency of the compressor for operation.
Further, in the above formula, X Limit of n For the frequency-limited value of the modified parameter X, X Lowering n When the air conditioner enters a protection parameter correction mode for the corrected frequency reduction value of the parameter X, when the real-time value X of the parameter X is in a protection parameter correction mode n To reach X Limit of n Then, the air conditioner limits the frequency of the compressor to continuously rise; when the real-time value X of the parameter X n To X Lowering n Then, the air conditioner reduces the frequency of the compressor for operation.
Further, in the above formula, n is the frequency reduction frequency of the variable frequency air conditioner triggered by the parameter X in the step S2; m is the shutdown frequency of the variable frequency air conditioner triggered by the parameter X in the step S2; the A, B and C are preset values, and the values of the A, B and C can be obtained through experiments.
Therefore, in the inverter air conditioner control method of the present application, the threshold value of the parameter X, such as X Limit of 0 And X Reduce 0 The principle of correction is as follows: hysteresis according to parameter XIs characterized in that the initial and preset threshold value X of the system Limit of 0 And X Decrease 0 The frequency limiting method is based on the prior art, and is characterized in that a certain degree of reduction compensation is carried out to ensure that the protection has lead, so that the frequency limiting condition can be triggered to carry out frequency limiting before the frequency of the compressor is increased, and the corrected frequency reduction value X is not easy to trigger again the system operation parameter after the frequency of the compressor is reduced Decreasing n It is used. Even if the air conditioner triggers the corrected down-conversion value X again Lowering n Then the system will again down convert value X Decreasing n The correction is carried out, so that the correction amount is increased, the system is protected earlier, the air conditioner system is prevented from frequently increasing, reducing the frequency or stopping, and the operation stability of the air conditioner is improved.
Further, the initial frequency limiting value X of the parameter X preset for the system is Limit of 0 Corrected amplitude (n X a + m X B) > said initial down-conversion value X for the system preset parameter X Reduce 0 In this way, the corrected frequency-limited value X can be increased Limit of n And the down-conversion value X Lowering n The difference between them, gives the system a longer reaction time.
Further, the step S4 specifically includes: when the air conditioner runs in a protection parameter correction mode, frequency limiting values X of corrected parameters X are respectively obtained Limit of n And the down-conversion value X Lowering n And a shutdown value X of a parameter X preset by the system Stop And regulating and controlling the running state of the air conditioner according to the following processes:
s401, judging the real-time value X of the parameter X n Whether or not the stop value is greater than or equal to X Stop at If so, controlling the compressor of the variable frequency air conditioner to stop; if not, continuing to execute the step S402;
s402, judging the real-time value X of the parameter X n Whether or not it is greater than or equal to the down-conversion value X Decreasing n If yes, controlling a compressor of the variable frequency air conditioner to perform frequency reduction operation; if not, continuing to execute the step S403;
s403, judging the real-time value X of the parameter X n Whether the frequency limit value is more than or equal to X Limit of n If yes, limiting the frequency increasing operation of a compressor of the variable frequency air conditioner; if not, the running state of the inverter air conditioner is maintained unchanged.
In the above-mentionedIn step S4, real-time value X of parameter X is passed n And a shutdown value X Stop at Corrected down-conversion value X Lowering n And the corrected frequency limiting value X Limit of n The operation state of the variable frequency air conditioner is regulated and controlled by the size relationship, and frequent rising, falling, starting and stopping of the variable frequency air conditioner are avoided through regulation and control, so that the operation state of the variable frequency air conditioner is more stable.
The following describes the regulation and control result of the inverter air conditioner control method according to the present application with reference to the schematic operating state diagrams of the air conditioner shown in fig. 1, 4 and 5, specifically: FIG. 1 is a schematic view of an operation state of a variable frequency air conditioner under a current protection logic, in FIG. 1, X Stop For a shutdown value of the parameter X, X Reduce 0 Initial frequency reduction value of parameter X preset for system, X Limit of 0 Initial limiting value, F, of a parameter X preset for the system Target Target frequency value of compressor preset for system, F Frequency reduction Compressor down-frequency, F, preset for the system n Is the real-time operating frequency of the compressor; x n Is a real-time value of parameter X; curve 10 is the real-time value X of parameter X n A time-dependent profile; curve 20 is the real-time operating frequency F of the compressor n Time profile. Under the regulation and control of the existing control logic, the operation state of the inverter air conditioner is shown in fig. 1, and after the air conditioner is started, the real-time operation frequency F of the compressor n The curve 20 rising rapidly with time to reach the target frequency F Target (ii) a At the same time, the real-time value X of the operating parameter X of some hysteresis of the system n Also begins to rise, but X n Is compared with the real-time running frequency F of the compressor n Much slower, therefore, at X n Reach the frequency limit value X preset by the system Limit of 0 Before, the real-time operating frequency F of the compressor n Has risen to a target frequency value F Target (ii) a Then running real-time value X of parameter X n Continues to rise, at time t1, real-time value X of operating parameter X n The initial frequency reduction value X preset by the system is reached for the first time Decrease 0 While the real-time running frequency F of the compressor n A frequency reduction occurs, the frequency of which is reduced to the reduction frequency F of the compressor Frequency reduction (ii) a Real-time value X of parameter X after compressor runs for a period of time at lower frequency after frequency reduction n The compressor slowly lowers, the frequency reduction protection on the compressor is released at the time t2, and then the compressor starts to run in an up-conversion mode; real-time value X of parameter X n Slow follow-up of hysteresis also begins to rise; like the above process, at the time of t3, the compressor operates in the frequency reduction protection mode again, and then the frequency of the compressor periodically starts to increase and decrease, so that the inverter air conditioner system cannot operate stably all the time. In addition, the inverter air conditioner may also have a periodic start-up and shut-down phenomenon in other severe environments, and the principle of the inverter air conditioner is substantially the same as that of the above process, and is not described herein again.
Correspondingly, fig. 4 is a schematic view of an operation state of the inverter air conditioner under the control of the inverter air conditioner control method of the invention, and in fig. 4, X Stop at For a shutdown value of the parameter X, X Reduce 0 Initial frequency reduction value of parameter X preset for system, X Limit of 0 Initial frequency limit value of parameter X preset for system, X Limit of n For the frequency-limited value of the modified parameter X, F Target Target frequency value of compressor preset for system, F Frequency reduction Compressor frequency reduction, F, predetermined for the system Correction A correction value for the corrected compressor; f n Is the real-time operating frequency of the compressor; x n Is a real-time value of parameter X; curve 11 is the real-time value X of parameter X n A time-dependent profile; curve 21 is the real-time operating frequency F of the compressor n Time profile. Under the regulation and control of the control method of the inverter air conditioner, the running state of the inverter air conditioner is shown in fig. 4, and after the air conditioner is started, the real-time running frequency F of the compressor n The curve 21 rising rapidly with time to reach the target frequency F Target (ii) a At the same time, the real-time value X of the operating parameter X of some hysteresis of the system n Also begins to rise, but X n Is compared with the real-time running frequency F of the compressor n Much slower, therefore at X n Reach the frequency limit value X preset by the system Limit of 0 Before, the real-time operating frequency F of the compressor n Has risen to a target frequency value F Target (ii) a Then a real-time value X of the operating parameter X n Continuing to rise, and respectively generating frequency reduction at the time t1 and the time t2, wherein the frequency reduction times n =2, and when the preset standard in the step S2 is met, the initial frequency reduction value X is subjected to frequency reduction at the time t2 Decrease 0 And an initial frequency limiting value X Limit of 0 The automatic correction is carried out, since the system is not stopped, the number of times of stopping m =0, X Decreasing n ＝X Decrease 0 ，X Limit of n ＝X Limit of 0 -2 x a; at time t3, the real-time operating frequency F of the compressor n Starts to rise again, but the real-time value X of the parameter X n Triggering the corrected frequency limiting value X in advance Limit of n Thus the real-time operating frequency F of the compressor n Does not rise to F Target But according to the corrected frequency F Correction Operation, so real-time value X of operation parameter X n The down-conversion value X is not triggered subsequently Lowering n It can be stabilized quickly.
In addition, fig. 5 is a schematic view of another operation state of the inverter air conditioner under the control of the inverter air conditioner control method according to the present invention, wherein in fig. 5, X is Stop For a shutdown value of the parameter X, X Decrease 0 Initial frequency reduction value of parameter X preset for system, X Decreasing n Down-conversion value for corrected parameter X, X Limit of 0 Initial frequency limit value of parameter X preset for system, X Limit of n For the frequency-limited value of the modified parameter X, F Target Target frequency value of compressor preset for system, F Frequency reduction Compressor down-frequency, F, preset for the system Correction A correction value for the corrected compressor; f n Is the real-time operating frequency of the compressor; x n Is a real-time value of parameter X; curve 12 is the real-time value X of parameter X n A time-dependent profile; curve 22 represents the real-time operating frequency F of the compressor n Time profile. Under the regulation and control of the control method of the inverter air conditioner, the running state of the inverter air conditioner is shown in fig. 5, and after the air conditioner is started, the real-time running frequency F of the compressor n The curve 22 rises rapidly with time to reach the target frequency F Target (ii) a At the same time, the real-time value X of the operating parameter X of some hysteresis of the system n Also begins to rise, but X n Is higher than the real-time running frequency of the compressorRate F n Much slower, therefore, at X n Reach the frequency limit value X preset by the system Limit of 0 Before, real-time operating frequency F of the compressor n Has risen to a target frequency value F Target (ii) a Then running real-time value X of parameter X n Continues to rise and appears to be reduced at time t1, but the real-time running frequency F of the compressor after the reduction n The real-time value X of the parameter X, which is still high n Still rising, triggering a shutdown value X at time t2 Stop at Stopping the machine, wherein the stopping times m =1, and if the preset standard in the step S2 is met, the initial frequency reduction value X is subjected to the process at the moment t2 Reduce 0 And an initial frequency limit value X Limit of 0 Since automatic correction is performed and the number of stoppages m =1 and the number of downconversion n =1, X is Decreasing n ＝X Decrease 0 –C，X Limit of n = Xlimit 0-A-B; the real-time operating frequency F of the compressor n Rises again, at time t3, the real-time value X of parameter X n Triggering the corrected frequency limiting value X in advance Limit of n Thus the real-time running frequency F of the compressor n Will not rise to F Target But according to a modified frequency F Correction Operate so as to operate the real-time value X of the parameter X n The down-conversion value X is not triggered subsequently Decreasing n It can be stabilized quickly.
As shown in fig. 3, after entering the protection parameter modification mode in step S3, the inverter air conditioner may exit the protection parameter modification mode through the following process:
s5, acquiring a frequency reduction value and a frequency limiting value of a parameter X in the current system, and recording the frequency reduction value and the frequency limiting value as X Lowering n And X Limit of n (ii) a And acquiring the initial frequency reduction value X of the parameter X in the variable frequency air conditioner Reduce 0 And an initial frequency limit value X Limit of 0 ；
S6, judging whether X is present Lowering n ＝X Decrease 0 And X Limit of n ＝X Limit of 0 If so, judging that the air conditioner does not enter the protection parameter correction mode and the air conditioner keeps running continuously in the current state; if not, judging that the air conditioner enters the protection parameter correction mode, and continuing to execute the step S7;
s7, judging whether the air conditioner is in useDetecting a shutdown signal or a power-off signal, if so, exiting the protection parameter correction mode, and reducing the frequency value X of the parameter X Descend Is restored to the initial set value X Reduce 0 Limiting the frequency value X of the parameter X Limit of Is restored to the initial set value X Limit of 0 (ii) a If not, continuing to execute the step S8;
s8, judging whether a real-time value X of the parameter X is continuously detected in the T2 time n Satisfy X n -X Decreasing n Less than or equal to a preset threshold value Y; if yes, the protection parameter correction mode is exited, and the frequency reduction value X of the parameter X is reduced Descend Restore to the original down-conversion value X Decrease 0 Limiting the frequency value X of the parameter X Limit for Is restored to the initial frequency limiting value X Limit of 0 (ii) a If not, maintaining the frequency reduction value X of the parameter X Descend Is X Lowering n Frequency-limited value X of parameter X Limit for Is X Limit of n And the inverter air conditioner is enabled to continuously run in the protection parameter correction mode.
Generally, the inverter air conditioner operates in a normal mode, and enters the protection parameter correction mode to operate only under severe working conditions, and the inverter air conditioner can automatically exit the protection parameter correction mode after the inverter air conditioner passes the severe working conditions through the steps S5 to S8, so that the air conditioner can continue to operate according to an initial set value X Decrease 0 And X Limit of 0 And the operation is carried out, the control process is optimized under the condition of not greatly increasing the cost, the operation stability and the reliability of the variable frequency air conditioner are improved, and the service life of the variable frequency air conditioner is prolonged.
In summary, it is easy to find that the inverter air conditioner control method of the present application has the following advantages:
firstly, when the variable frequency air conditioner runs under a severe working condition and frequent rising, falling or starting and stopping occur, the control method of the variable frequency air conditioner can stabilize the running frequency of the compressor as soon as possible by automatically correcting the threshold value of the protection parameter X;
secondly, after entering the protection parameter correction mode, judging whether the variable frequency air conditioner exits or continues to operate according to the protection parameter correction mode according to the actual working condition, and being capable of being matched with other working modes of the air conditioner without influencing the operation of the air conditioner under other working conditions;
thirdly, under the action of the control method of the variable frequency air conditioner, the variable frequency air conditioner can be controlled in a self-adaptive mode, frequent frequency increase and decrease or startup and shutdown are avoided, and the operation stability, reliability and service life of the variable frequency air conditioner are improved.
Although the present invention is disclosed above, the present invention is not limited thereto. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.
Claims (8)
1. A control method of an inverter air conditioner is characterized by comprising the following steps:
s1, starting the variable frequency air conditioner, and reading a real-time value X of a system operation parameter X n ；
S2, judging whether the frequency reduction times n or the shutdown times m of the air conditioner triggered by the parameter X meet a preset standard within a period of time T1, if so, continuing to execute the step S3; if not, the variable frequency air conditioner maintains the current state to continue running;
s3, obtaining values of the frequency reduction times n of the variable-frequency air conditioner triggered by the parameter X and the shutdown times m of the variable-frequency air conditioner triggered by the parameter X in the step S2, and correcting the threshold value of the parameter X by using the values of n and m through the following formula to enable the air conditioner to enter a protection parameter correction mode;
X limit of n ＝X Limit of 0 –n*A-m*B；
X Decreasing n ＝X Reduce 0 –m*C；
Wherein, X Limit of 0 For an initial frequency-limiting value of a pre-corrected, system-preset parameter X, X Decrease 0 For the initial reduced frequency value of a pre-corrected, system-preset parameter X, X Limit of n For the frequency-limited value of the modified parameter X, X Decreasing n The corrected frequency reduction value of the parameter X is obtained, and n is the frequency reduction times of the variable frequency air conditioner triggered by the parameter X in the step S2; m is the frequency conversion air conditioner shutdown frequency triggered by the parameter X in the step S2; A. b and C are preset values;
and S4, the air conditioner operates in a protection parameter correction mode.
2. The inverter air conditioner control method according to claim 1, wherein the parameter X is an operation parameter having hysteresis with a compressor frequency variation in the inverter air conditioner.
3. The inverter air conditioner control method of claim 2, wherein the parameter X is compressor discharge temperature, coil temperature or controller module temperature.
4. The inverter air conditioner control method according to claim 1, wherein the step S2 comprises: judging whether the frequency reduction times N of the variable-frequency air conditioner triggered by the parameter X are more than or equal to N1 or not within a period of time T1 or whether the frequency stop times M of the variable-frequency air conditioner triggered by the parameter X are more than or equal to M1 or not, wherein N1 and M1 are preset values; if yes, continuing to execute the step S3; if not, the air conditioner keeps the current state to continue running.
5. The inverter air conditioner control method according to claim 4, wherein the value range of N1 is 2-4, and the value range of M1 is 1-2.
6. The inverter air conditioner control method according to claim 1, wherein the parameter X is preset for the system at the beginningInitial frequency limiting value X Limit of 0 Corrected amplitude (n X a + m X B) > initial frequency reduction value X for parameter X preset by system Reduce 0 The correction amplitude (m × C) of (d).
7. The inverter air conditioner control method according to claim 1, wherein the step S4 specifically comprises: when the air conditioner runs in a protection parameter correction mode, frequency limiting values X of corrected parameters X are respectively obtained Limit of n And the down-conversion value X Lowering n And a shutdown value X of a parameter X preset by the system Stop at And the running state of the air conditioner is regulated and controlled according to the following processes:
s401, judging a real-time value X of the parameter X n Whether or not the stop value is greater than or equal to X Stop at If yes, controlling a compressor of the variable frequency air conditioner to stop; if not, continuing to execute the step S402;
s402, judging the real-time value X of the parameter X n Whether or not it is greater than or equal to the down-conversion value X Decreasing n If so, controlling the compressor of the variable frequency air conditioner to perform frequency reduction operation; if not, continuing to execute the step S403;
s403, judging the real-time value X of the parameter X n Whether the frequency limit value is more than or equal to X Limit of n If yes, limiting the frequency increasing operation of a compressor of the variable frequency air conditioner; if not, the running state of the inverter air conditioner is maintained unchanged.
8. The inverter air conditioner control method according to claim 1, wherein after entering the protection parameter modification mode, the inverter air conditioner is further capable of exiting the protection parameter modification mode through the following procedures:
s5, acquiring a frequency reduction value and a frequency limit value of a parameter X in the current system, and recording the frequency reduction value and the frequency limit value as X Lowering n And X Limit of n (ii) a And acquiring the initial frequency reduction value X of the parameter X in the variable frequency air conditioner Reduce 0 And an initial frequency limiting value X Limit of 0 ；
S6, judging whether X is present Lowering n ＝X Reduce 0 And X Limit of n ＝X Limit of 0 If yes, the air conditioner is judged not to enter the protection parameter correction mode and the air conditioner maintains the current stateThe state continues to run; if not, judging that the air conditioner enters the protection parameter correction mode, and continuing to execute the step S7;
s7, judging whether the air conditioner detects a shutdown signal or a power-off signal, if so, exiting the protection parameter correction mode, and restoring the frequency reduction value of the parameter X to the initial set value X Reduce 0 Restoring the frequency limiting value of the parameter X to the initial set value X Limit of 0 (ii) a If not, continuing to execute the step S8;
s8, judging whether the real-time value X of the parameter X is continuously detected in the T2 time n Satisfy X n -X Lowering n Less than or equal to a preset threshold value Y; if yes, the protection parameter correction mode is exited, and the frequency reduction value of the parameter X is restored to the initial frequency reduction value X Decrease 0 Restoring the frequency limit value of the parameter X to the initial frequency limit value X Limit of 0 (ii) a If not, maintaining the frequency reduction value of the parameter X as X Lowering n The frequency limit value of the parameter X is X Limit of n And the inverter air conditioner is enabled to continuously run in the protection parameter correction mode.
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