CN113654225B - Control method and system of compressor and air conditioner - Google Patents
Control method and system of compressor and air conditioner Download PDFInfo
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention relates to the technical field of air conditioner control, and particularly provides a control method and a control system for a compressor and an air conditioner, which solve the problem that the control of the compressor is possibly failed due to the deviation of the parameters of the conventional compressor. For this purpose, the control method of the compressor of the invention obtains the offset of the variable frequency control parameter according to the comparison result of the variable frequency control parameter in the actual operation of the compressor and the initial value of the preset variable frequency control parameter, determines whether to pre-correct the variable frequency control parameter according to the offset, and further judges whether to finally correct the variable frequency control parameter according to the monitoring parameter of the compressor before and after pre-correction, thereby avoiding the problems of the offset of the variable frequency control parameter and the control failure of the compressor caused by the reduction of the material characteristics due to the long-term operation of the compressor.
Description
Technical Field
The invention relates to the technical field of air conditioner control, and particularly provides a control method and system of a compressor and an air conditioner.
Background
With the increasing popularization of the variable frequency air conditioner, the air conditioning technology is more and more mature. The compressor plays a very important role in the use process of the air conditioner. However, over time, the properties of some of the materials in the compressor may degrade, causing some of the control parameters for variable frequency control of the compressor to drift; in addition, the conventional method for managing the control parameters of the compressor generally inputs the control parameters into a register in advance, and when the compressor performs the frequency conversion control, the control parameters can be directly called from the register to perform the frequency conversion control.
Accordingly, there is a need in the art for a new compressor control scheme to address the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problem that the existing compressor has deviation in parameters, which may cause the control failure of the compressor.
In a first aspect, the present invention provides a control method of a compressor, the control method including:
acquiring the offset of the variable frequency control parameter according to the variable frequency control parameter in the actual operation of the compressor and a preset initial value of the variable frequency control parameter;
when the offset is larger than an offset threshold, pre-correcting the variable frequency control parameter;
and selectively carrying out final correction on the variable frequency control parameter according to the parameter correction value adopted when the variable frequency control parameter is subjected to pre-correction according to the comparison result of the actual value of the preset compressor monitoring parameter before the pre-correction and the actual value of the compressor monitoring parameter after the pre-correction.
In one embodiment of the above compressor control method, the monitored parameters include an operating efficiency of the compressor and compressor parameters affecting the operating efficiency, where the compressor parameters affecting the operating efficiency at least include phase currents of the compressor;
the step of selectively performing final correction on the frequency conversion control parameter according to the parameter correction value adopted when the frequency conversion control parameter is subjected to pre-correction specifically comprises the following steps:
when the monitoring parameter is the operation efficiency of the compressor, if the actual value of the operation efficiency preset before the pre-correction is smaller than the actual value of the operation efficiency after the pre-correction is performed, performing the final correction; otherwise, the final correction is not carried out;
when the monitored parameters are compressor parameters influencing the operating efficiency, if the compressor parameters fall into a preset parameter value range for reducing the operating efficiency of the compressor, performing the final correction; otherwise, the final correction is not performed.
In one technical solution of the control method of the compressor, the variable frequency control parameter at least includes a back electromotive force constant and an inductance value of the compressor, and an initial value of the preset variable frequency control parameter is a parameter correction value adopted when the variable frequency control parameter is finally corrected last time; the step of "obtaining the offset of the variable frequency control parameter" specifically includes:
according to the frequency conversion control parameter in the actual operation of the compressor and a preset frequency conversion control parameter initial value, acquiring the offset of the frequency conversion control parameter by adopting a method shown in the following formula:
wherein a is the offset of the variable frequency control parameter, F 0 And F is the frequency conversion control parameter in the actual operation of the compressor.
In one embodiment of the above method for controlling a compressor, the method further includes obtaining a back electromotive force constant of the compressor in actual operation by a method shown in the following formula:
wherein Ke is the back electromotive force constant in the actual operation, V Inverse direction And r is the rotating speed of the compressor in actual operation.
In a second aspect, the present invention provides a control system of a compressor, the control system comprising:
the parameter offset acquisition module is configured to acquire the offset of the variable frequency control parameter according to the variable frequency control parameter in the actual operation of the compressor and a preset initial value of the variable frequency control parameter;
a parameter pre-correction module configured to pre-correct the variable frequency control parameter when the offset is greater than an offset threshold;
and the parameter final correction module is configured to selectively perform final correction on the variable frequency control parameter according to a comparison result of an actual value of a preset compressor monitoring parameter before the pre-correction and an actual value of the compressor monitoring parameter after the pre-correction, and according to a parameter correction value adopted when the pre-correction is performed on the variable frequency control parameter.
In an embodiment of the control system of the compressor, the monitored parameters include an operating efficiency of the compressor and compressor parameters affecting the operating efficiency, wherein the compressor parameters affecting the operating efficiency at least include phase currents of the compressor;
the parameter final correction module is further configured to perform final correction of the variable frequency control parameter according to the following steps:
when the monitoring parameter is the operation efficiency of the compressor, if the actual value of the operation efficiency preset before the pre-correction is smaller than the actual value of the operation efficiency after the pre-correction is performed, performing the final correction; otherwise, the final correction is not carried out;
when the monitored parameters are compressor parameters influencing the operating efficiency, if the compressor parameters fall into a preset parameter value range for reducing the operating efficiency of the compressor, performing the final correction; otherwise, the final correction is not performed.
In one technical solution of the control system of the compressor, the variable frequency control parameter at least includes a back electromotive force constant and an inductance value of the compressor, and an initial value of the preset variable frequency control parameter is a parameter correction value adopted when the variable frequency control parameter is finally corrected last time; the parameter offset obtaining module is configured to obtain the offset of the frequency conversion parameter according to the following steps:
according to the frequency conversion control parameter in the actual operation of the compressor and a preset frequency conversion control parameter initial value, acquiring the offset of the frequency conversion control parameter by adopting a method shown in the following formula:
wherein a is the offset of the variable frequency control parameter, F 0 And F is the initial value of the preset variable frequency control parameter, and F is the variable frequency control parameter in the actual operation of the compressor.
In an aspect of the control system of the compressor, the system further includes a back electromotive force constant calculation module configured to obtain a back electromotive force constant in actual operation of the compressor by a method shown in the following formula:
wherein Ke is the back electromotive force constant in the actual operation, V Inverse direction And r is the counter electromotive force in the actual operation of the compressor, and r is the rotating speed in the actual operation of the compressor.
In a third aspect, a control system of a compressor is provided, comprising a processor and a storage device, wherein the storage device is adapted to store a plurality of program codes, and the program codes are adapted to be loaded and run by the processor to execute the control method of the compressor according to any one of the above-mentioned control method solutions.
In a fourth aspect, an air conditioner is provided, which includes an air conditioner body and a control system of the compressor in any one of the above technical solutions.
Under the condition of adopting the technical scheme, the method can obtain the offset of the variable frequency control parameter according to the variable frequency control parameter in the actual operation of the compressor and the preset initial value of the variable frequency control parameter, pre-correct the variable frequency control parameter when the offset of the variable frequency control parameter is larger than the offset threshold, and selectively carry out final correction on the variable frequency control parameter according to the comparison result of the actual value of the compressor monitoring parameter before pre-correction and the actual value of the compressor monitoring parameter after pre-correction and the parameter correction value adopted when the pre-correction is carried out on the variable frequency control parameter. By the setting method, the offset of the variable frequency control parameter of the compressor can be effectively monitored, when the offset of the variable frequency control parameter is larger than the offset threshold, the variable frequency control parameter is pre-corrected, whether the variable frequency control parameter is finally corrected or not is further judged according to the comparison result of the actual values of the monitoring parameter of the compressor before pre-correction and after pre-correction, the problem that the compressor fails to be controlled due to large offset of the variable frequency control parameter is avoided, effective variable frequency control of the compressor can be realized, and the operation efficiency of the compressor is improved.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Wherein:
fig. 1 is a schematic flow chart of main steps of a control method of a compressor according to an embodiment of the present invention;
fig. 2 is a main block diagram of a control system of a compressor according to an embodiment of the present invention.
Detailed Description
Some embodiments of the invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, a "module" or "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, a microprocessor, a digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like. The term "a and/or B" denotes all possible combinations of a and B, such as a alone, B alone or a and B. The term "at least one A or B" or "at least one of A and B" means similar to "A and/or B" and may include only A, only B, or both A and B. The singular forms "a", "an" and "the" may include the plural forms as well.
At present, the conventional control method of the compressor is to pre-store some key control parameters in a register, and directly read the control parameters from the register in the running process of the compressor to control the compressor. However, in the actual operation process of the compressor, the material characteristics of the compressor may be reduced with the passage of time, taking a winding coil of the compressor as an example, the material characteristics of the coil may be reduced with the increase of the service life of the compressor, so that the actual control parameters related to the coil may be different from the control parameters preset in the register, and as the difference of the control parameters becomes larger, the failure of the compressor control may be caused. The material characteristics refer to inherent properties of the object itself, including characteristic performance, and include the magnitude of inductance of the inductance coil, taking the inductance coil as an example.
Accordingly, the present invention provides a method and a system for controlling a compressor, and an air conditioner to solve the above problems.
Referring to fig. 1, fig. 1 is a flow chart illustrating main steps of a control method of a compressor according to an embodiment of the present invention. As shown in fig. 1, the control method of the compressor in the embodiment of the present invention mainly includes the following steps S101 to S103.
Step S101: and acquiring the offset of the variable frequency control parameter according to the variable frequency control parameter in the actual operation of the compressor and the initial value of the preset variable frequency control parameter.
The variable frequency control parameter refers to a parameter capable of performing variable frequency control on the compressor, and specifically is a parameter capable of influencing the operating frequency of the compressor in the operating process.
In this embodiment, the variable frequency control parameter in the actual operation of the compressor may be obtained, and the variable frequency control parameter in the actual operation is compared with the initial value of the preset variable frequency control parameter to obtain the offset of the variable frequency control parameter of the compressor.
Step S102: and when the offset is greater than the offset threshold, pre-correcting the variable frequency control parameter.
In this embodiment, the offset of the variable frequency control parameter of the compressor may be compared with a preset offset threshold, and when the offset of the variable frequency control parameter is greater than the offset threshold, the variable frequency control parameter of the compressor may be pre-corrected. The offset threshold can be determined by one skilled in the art as needed in the actual application process.
In one embodiment, the offset threshold is 10%, that is, when the offset is greater than 10%, the frequency conversion control parameter may be pre-corrected; and when the offset is less than or equal to 10%, the frequency conversion control parameters are not pre-corrected.
The pre-correction is to set the initial value of the preset variable frequency control parameter as the variable frequency control parameter obtained by calculation or measurement in the actual operation of the compressor, and control the compressor to operate for a period of time.
Step S103: and according to the comparison result of the actual value of the preset compressor monitoring parameter before the pre-correction and the actual value of the compressor monitoring parameter after the pre-correction, selectively performing final correction on the variable frequency control parameter according to the parameter correction value adopted when the pre-correction is performed on the variable frequency control parameter.
In this embodiment, the actual value of the preset compressor monitoring parameter before the pre-correction and the actual value of the compressor monitoring parameter after the pre-correction may be obtained, and the two values are compared, and according to the comparison result, whether to finally correct the variable frequency control parameter is determined. If the frequency conversion control parameters need to be finally corrected, the frequency conversion control parameters can be finally corrected according to the parameter correction values adopted when the frequency conversion control parameters are subjected to pre-correction, namely the parameter correction values adopted when the pre-correction is carried out are used as the initial values of the preset frequency conversion control parameters.
The final correction refers to setting the initial value of the preset variable frequency control parameter as a parameter correction value adopted when the compressor performs pre-correction.
Based on the steps S101 to S103, the present invention can obtain the offset of the variable frequency control parameter according to the variable frequency control parameter in the actual operation of the compressor and the preset initial value of the variable frequency control parameter, pre-correct the variable frequency control parameter when the offset of the variable frequency control parameter is greater than the offset threshold, and selectively perform the final correction on the variable frequency control parameter according to the comparison result between the actual value of the compressor monitoring parameter before the pre-correction and the actual value of the compressor monitoring parameter after the pre-correction, and the parameter correction value adopted when the pre-correction is performed on the variable frequency control parameter. By the setting method, the offset of the variable frequency control parameter of the compressor can be effectively monitored, when the offset of the variable frequency control parameter is larger than the offset threshold, the variable frequency control parameter is pre-corrected, and whether the variable frequency control parameter is finally corrected or not is further judged according to the comparison result of the actual values of the compressor monitoring parameter before pre-correction and after pre-correction, so that the problem that the compressor control fails due to large offset of the variable frequency control parameter is avoided, the effective variable frequency control of the compressor can be realized, and the operation efficiency of the compressor is improved.
In an optional implementation manner of the embodiment of the present invention, the method for controlling the compressor may further include, in addition to the steps S101 to S103, the following steps: obtaining a back electromotive force constant in actual operation of the compressor by a method shown in formula (1):
the meaning of each parameter in formula (1): ke is the back electromotive constant in actual operation, V Trans form R is the counter electromotive force in the actual operation of the compressor, and r is the rotation speed in the actual operation of the compressor.
In the present embodiment, the counter electromotive force constant during the actual operation of the compressor can be calculated according to the formula (1) by applying the counter electromotive force during the actual operation of the compressor and the rotation speed during the actual operation of the compressor, wherein the counter electromotive force during the actual operation of the compressor is obtained through actual detection. The counter electromotive force is an electromotive force generated by a tendency of a change of a counter current, and according to an electromagnetic current, when a magnetic field changes, a nearby conductor generates an induced voltage which is equal to a voltage value applied to two ends of an inductance coil and opposite to the voltage value, and the induced voltage is the counter electromotive force. The back electromotive force constant refers to a ratio relationship between the back electromotive force generated from the winding coil of the compressor and the rotational speed of the compressor.
Step S101 and step S103 will be further described below.
In an optional implementation manner of the embodiment of the present invention, the variable frequency control parameter at least includes a back electromotive force constant and an inductance value of the compressor, and the preset initial value of the variable frequency control parameter is a parameter correction value used when the variable frequency control parameter is finally corrected last time. The inductance refers to a physical quantity of self-induction capability of a winding coil of the compressor.
Step S101 may further include:
according to the frequency conversion control parameter in the actual operation of the compressor and a preset frequency conversion control parameter initial value, acquiring the offset of the frequency conversion control parameter by adopting a method shown in the following formula (2):
the meaning of each parameter in formula (2) is: a is the offset of the variable frequency control parameter, F 0 And F is the frequency conversion control parameter in the actual operation of the compressor.
In this embodiment, the variable frequency control parameter may include a back electromotive force constant and an inductance of the compressor, and the preset initial value of the variable frequency control parameter may be a parameter correction value used when the variable frequency control parameter is finally corrected last time. The offset of the variable frequency control parameter can be obtained according to the method shown in the formula (2) according to the variable frequency control parameter in the actual operation of the compressor and the preset initial value of the variable frequency control parameter.
In one embodiment, the variable frequency control parameter may be a back electromotive force constant of the compressor. In the actual operation control process, the compressor calculates the counter electromotive force of the compressor according to a preset counter electromotive force constant, acquires a voltage value required to be applied to the compressor according to the counter electromotive force of the compressor, and further changes the rotating speed of the compressor and the operating frequency of the compressor according to the voltage value applied to the compressor, so that the variable frequency control of the compressor is realized. When the material properties of the winding coil are degraded, the back electromotive force generated by the coil is degraded. The compressor still calculates the back electromotive force of the control compressor according to the preset back electromotive force constant, which results in that the calculated back electromotive force of the control compressor is higher than the back electromotive force actually generated by the coil. This causes the voltage applied by the compressor to be higher than the voltage value actually required by the compressor, further causing deviation between the rotation speed and frequency for controlling the operation of the compressor and the rotation speed and frequency during the actual operation of the compressor, resulting in a failure in controlling the compressor, and causing a decrease in output efficiency. In the present embodiment, the compressor may calculate the back electromotive force constant to be actually operated by the compressor according to the formula (1) based on the back electromotive force measured in the actual operation of the compressor and the rotation speed in the actual operation of the compressor. And calculates the offset of the back emf constant by applying equation (2). The calculated offset of the back electromotive force constant can be compared with a preset offset threshold of the back electromotive force constant, and when the offset of the back electromotive force constant is larger than the offset threshold, the back electromotive force constant is pre-corrected.
In another embodiment, the variable frequency control parameter may be an inductance of the compressor. In the actual operation control process, the compressor can obtain the waveforms of pulse voltages of different rotor positions of the stator winding of the compressor according to the preset inductance value, and further determine the current change rate of the stator winding according to the waveforms of the pulse voltages. Generally, the inductance decreases, the rate of change of the current increases, the inductance increases, and the rate of change of the current decreases, i.e., the rate of change of the current of the winding is inversely proportional to the magnitude of its inductance. According to the change rule, the minimum point of the inductance value of the compressor can be detected, namely the initial position interval of the rotor. When the material characteristics of the winding coil are reduced, the inductance of the coil is reduced. Therefore, the preset inductance for controlling the compressor is higher than the actual inductance of the compressor, the waveform of the pulse voltage of different rotor positions of the winding is further deviated, the initial position of the rotor is determined inaccurately, the compressor can be controlled in a starting process to fail, and the output efficiency is reduced. In this embodiment, the compressor may calculate the offset of the inductance according to the inductance measured during the actual operation of the compressor and applying the formula (2). The calculated offset of the inductance can be compared with a preset offset threshold of the inductance, and when the offset of the inductance is larger than the offset threshold, the inductance is pre-corrected.
In another embodiment, the preset initial value of the variable frequency control parameter may be a parameter correction value used in the last final correction of the variable frequency control parameter. That is, the frequency conversion control parameter in actual operation may be obtained at intervals of time T (T > 0) according to the requirement in the actual operation process, the offset of the frequency conversion control parameter is calculated according to the above formula (2), whether to pre-correct the frequency conversion control parameter is determined according to the method in step S102, and whether to finally correct the frequency conversion control parameter is further determined according to the method in step S103. If the frequency conversion control parameters are finally corrected, the frequency conversion control parameters in actual operation can be stored in a register of the compressor, and the compressor is subjected to frequency conversion control according to the frequency conversion control parameters; and after the time interval T, the frequency conversion control parameters in the actual operation process of the compressor can be obtained again and compared with the frequency conversion control parameters stored in the register. Through the circulation process, the frequency conversion control parameters of the compressor can be self-corrected according to the actual running condition of the compressor, and the condition that the compressor control fails due to the reduction of material characteristics in the running process of the compressor can be effectively avoided.
In an alternative implementation of the embodiment of the invention, the monitored parameters comprise an operating efficiency of the compressor and compressor parameters affecting the operating efficiency, wherein the compressor parameters affecting the operating efficiency comprise at least phase currents of the compressor. Step S103 may further include:
when the monitoring parameter is the running efficiency of the compressor, if the actual value of the running efficiency preset before the pre-correction is smaller than the actual value of the running efficiency after the pre-correction is carried out, carrying out final correction; otherwise, final correction is not carried out;
when the monitoring parameter is a compressor parameter which affects the operation efficiency, if the compressor parameter falls into a preset parameter value range which reduces the operation efficiency of the compressor, final correction is carried out; otherwise, final correction is not performed.
In this embodiment, the monitored parameters may include an operating efficiency of the compressor and compressor parameters affecting the operating efficiency, wherein the compressor parameters affecting the operating efficiency may include at least phase currents of the compressor.
In one embodiment, when the monitoring parameter is the operation efficiency of the compressor, the actual value of the operation efficiency preset before the pre-correction of the compressor and the actual value of the operation efficiency after the pre-correction of the compressor may be obtained, and when the actual value of the operation efficiency preset before the pre-correction of the compressor is smaller than the actual value of the operation efficiency after the pre-correction of the compressor, the final correction may be performed, otherwise, the final correction is not performed. That is, if the operation efficiency of the compressor is improved after the pre-correction is performed, the final correction is performed, otherwise the final correction is not performed.
In one embodiment, when the monitored parameter is the phase current of the compressor, the actual value of the phase current of the compressor before the compressor is pre-corrected and the actual value of the phase current of the compressor after the pre-correction can be obtained, and when the actual value of the phase current after the pre-correction is smaller than the actual value of the phase current before the pre-correction, the final correction can be performed, otherwise, the final correction is not performed. That is, when the actual value of the phase current of the compressor is decreased, the loss efficiency of the compressor is decreased, so that the operation efficiency of the compressor is increased, the final correction may be performed, otherwise, the final correction is not performed.
It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art can understand that, in order to achieve the effect of the present invention, different steps do not have to be executed in such a sequence, and they may be executed simultaneously (in parallel) or in other sequences, and these changes are all within the scope of the present invention.
Furthermore, the invention also provides a control system of the compressor.
Referring to fig. 2, fig. 2 is a main block diagram of a control system of a compressor according to an embodiment of the present invention. As shown in fig. 2, the control system of the compressor in the embodiment of the present invention may include a parameter offset amount obtaining module, a parameter pre-correction module, and a parameter final correction module. In this embodiment, the parameter offset obtaining module may be configured to obtain the offset of the variable frequency control parameter according to the variable frequency control parameter in the actual operation of the compressor and a preset initial value of the variable frequency control parameter. The parameter pre-correction module may be configured to pre-correct the variable frequency control parameter when the offset is greater than the offset threshold. The parameter final correction module can be configured to selectively perform final correction on the variable frequency control parameter according to a comparison result of an actual value of the preset compressor monitoring parameter before the pre-correction and an actual value of the pre-corrected compressor monitoring parameter.
In one embodiment, the monitored parameters may include an operating efficiency of the compressor and compressor parameters affecting the operating efficiency, wherein the compressor parameters affecting the operating efficiency include at least phase currents of the compressor; the parameter final correction module may be further configured to perform final correction of the variable frequency control parameter according to the following steps: when the monitoring parameter is the running efficiency of the compressor, if the actual value of the running efficiency preset before the pre-correction is smaller than the actual value of the running efficiency after the pre-correction is carried out, carrying out final correction; otherwise, final correction is not carried out; when the monitoring parameter is a compressor parameter which affects the operation efficiency, if the compressor parameter falls into a preset parameter value range which reduces the operation efficiency of the compressor, final correction is carried out; otherwise, final correction is not performed.
In one embodiment, the variable frequency control parameter may include at least a back electromotive force constant and an inductance value of the compressor, and the preset initial value of the variable frequency control parameter is a parameter correction value used for the last final correction of the variable frequency control parameter; the parameter offset obtaining module is configured to obtain the offset of the frequency conversion parameter according to the following steps: according to the frequency conversion control parameter in the actual operation of the compressor and a preset frequency conversion control parameter initial value, obtaining the offset of the frequency conversion control parameter by adopting a method shown in the following formula:
wherein a is the offset of the variable frequency control parameter, F 0 And F is the frequency conversion control parameter in the actual operation of the compressor.
In one embodiment, the control system of the compressor may further include an inverse electromotive constant calculation module. The back electromotive force constant calculation module may be configured to obtain a back electromotive force constant in actual operation of the compressor by a method shown in the following equation:
where, ke is the back electromotive constant in actual operation, V Inverse direction The back electromotive force in the actual operation of the compressor, and r is the rotation speed in the actual operation of the compressor.
The technical principles, the solved technical problems and the generated technical effects of the control system of the compressor described above are similar for implementing the embodiment of the control method of the compressor shown in fig. 1, and it can be clearly understood by those skilled in the art that for convenience and brevity of description, the contents described in the embodiment of the control method of the compressor may be referred to for the specific working process and related descriptions of the control system of the compressor, and are not repeated herein.
It will be understood by those skilled in the art that all or part of the flow of the method according to the above-described embodiment may be implemented by a computer program, which may be stored in a computer-readable storage medium and used to implement the steps of the above-described embodiments of the method when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying said computer program code, media, usb disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunication signals, software distribution media, etc. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media may not include electrical carrier signals or telecommunication signals in accordance with legislation and patent practice.
Furthermore, the invention also provides a control system of the compressor. In one embodiment of the control system of the compressor according to the present invention, the control system of the compressor may include a processor and a storage device, the storage device may be configured to store a program for executing the control method of the compressor of the above-described method embodiment, and the processor may be configured to execute the program in the storage device, the program including, but not limited to, the program for executing the control method of the compressor of the above-described method embodiment. For convenience of explanation, only the parts related to the embodiments of the present invention are shown, and details of the specific techniques are not disclosed. The control system may be a control device formed including various electronic devices.
Further, the invention also provides an air conditioner. In an embodiment of the air conditioner according to the present invention, the air conditioner may include an air conditioner body and a control system of the compressor described in the above control system embodiment of the compressor.
Further, it should be understood that, since the modules are only configured to illustrate the functional units of the system of the present invention, the corresponding physical devices of the modules may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the system may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solutions to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (8)
1. A control method of a compressor, characterized by comprising:
acquiring the offset of the variable frequency control parameter according to the variable frequency control parameter in the actual operation of the compressor and a preset initial value of the variable frequency control parameter;
when the offset is larger than an offset threshold, pre-correcting the variable frequency control parameter;
selectively performing final correction on the variable frequency control parameter according to a parameter correction value adopted when the variable frequency control parameter is subjected to pre-correction according to a comparison result of an actual value of a preset compressor monitoring parameter before the pre-correction and an actual value of the compressor monitoring parameter after the pre-correction;
the monitoring parameters comprise the operation efficiency of the compressor and the compressor parameters influencing the operation efficiency, wherein the compressor parameters influencing the operation efficiency at least comprise the phase current of the compressor;
the step of selectively performing final correction on the frequency conversion control parameter according to the parameter correction value adopted when the frequency conversion control parameter is subjected to pre-correction specifically comprises the following steps:
when the monitoring parameter is the operation efficiency of the compressor, if the actual value of the operation efficiency preset before the pre-correction is smaller than the actual value of the operation efficiency after the pre-correction is performed, performing the final correction; otherwise, the final correction is not carried out;
when the monitoring parameter is a compressor parameter which affects the operation efficiency, if the compressor parameter falls within a preset parameter value range which reduces the operation efficiency of the compressor, the final correction is carried out; otherwise, the final correction is not performed.
2. The method as claimed in claim 1, wherein the variable frequency control parameter at least includes a back electromotive force constant and an inductance of the compressor, and the preset initial value of the variable frequency control parameter is a parameter correction value used for the last final correction of the variable frequency control parameter; the step of "obtaining the offset of the variable frequency control parameter" specifically includes:
according to the frequency conversion control parameter in the actual operation of the compressor and a preset frequency conversion control parameter initial value, acquiring the offset of the frequency conversion control parameter by adopting a method shown in the following formula:
wherein a is the offset of the variable frequency control parameter, F 0 And F is the frequency conversion control parameter in the actual operation of the compressor.
3. The method as claimed in claim 2, further comprising obtaining a back electromotive force constant in an actual operation of the compressor by a method represented by:
wherein Ke is the back electromotive force constant in the actual operation, V Inverse direction And r is the rotating speed of the compressor in actual operation.
4. A control system for a compressor, the control system comprising:
the parameter offset acquisition module is configured to acquire the offset of the variable frequency control parameter according to the variable frequency control parameter in the actual operation of the compressor and a preset initial value of the variable frequency control parameter;
a parameter pre-correction module configured to pre-correct the variable frequency control parameter when the offset is greater than an offset threshold;
a parameter final correction module configured to selectively perform final correction on the variable frequency control parameter according to a comparison result between an actual value of a preset compressor monitoring parameter before the pre-correction and an actual value of the compressor monitoring parameter after the pre-correction, and according to a parameter correction value adopted when the pre-correction is performed on the variable frequency control parameter;
the monitoring parameters comprise the operation efficiency of the compressor and the compressor parameters influencing the operation efficiency, wherein the compressor parameters influencing the operation efficiency at least comprise the phase current of the compressor;
the parameter final correction module is further configured to perform final correction of the variable frequency control parameter according to the following steps:
when the monitoring parameter is the operation efficiency of the compressor, if the actual value of the operation efficiency preset before the pre-correction is smaller than the actual value of the operation efficiency after the pre-correction is performed, performing the final correction; otherwise, the final correction is not carried out;
when the monitoring parameter is a compressor parameter which affects the operation efficiency, if the compressor parameter falls within a preset parameter value range which reduces the operation efficiency of the compressor, the final correction is carried out; otherwise, the final correction is not performed.
5. The control system of the compressor according to claim 4, wherein the variable frequency control parameter at least includes a back electromotive force constant and an inductance of the compressor, and the initial value of the preset variable frequency control parameter is a parameter correction value used for the last final correction of the variable frequency control parameter; the parameter offset obtaining module is configured to obtain the offset of the variable frequency control parameter according to the following steps:
according to the frequency conversion control parameter in the actual operation of the compressor and a preset frequency conversion control parameter initial value, obtaining the offset of the frequency conversion control parameter by adopting a method shown in the following formula:
wherein a isOffset of the frequency conversion control parameter, F 0 And F is the frequency conversion control parameter in the actual operation of the compressor.
6. The control system of a compressor according to claim 5, further comprising a back electromotive force constant calculation module configured to obtain a back electromotive force constant in actual operation of the compressor by a method shown in the following formula:
wherein Ke is the back electromotive force constant in the actual operation, V Inverse direction And r is the rotating speed of the compressor in actual operation.
7. A control system of a compressor comprising a processor and a storage device adapted to store a plurality of program codes, characterized in that said program codes are adapted to be loaded and run by said processor to perform the control method of a compressor according to any one of claims 1 to 3.
8. An air conditioner characterized in that it comprises an air conditioner body and a control system of the compressor of any one of claims 4 to 6.
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| CN202110903377.8A CN113654225B (en) | 2021-08-06 | 2021-08-06 | Control method and system of compressor and air conditioner |
| PCT/CN2022/109026 WO2023011355A1 (en) | 2021-08-06 | 2022-07-29 | Compressor control method and system, and air conditioner |
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| CN115143594B (en) * | 2022-06-29 | 2024-05-24 | 北京小米移动软件有限公司 | Inductance value correction method, device, equipment, air conditioner and medium for air conditioner compressor |
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