CN107525234B - Method and device for frequency conversion protection of air conditioner compressor - Google Patents
Method and device for frequency conversion protection of air conditioner compressor Download PDFInfo
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Abstract
The invention discloses a method and a device for frequency conversion protection of an air conditioner compressor, and belongs to the technical field of air conditioners. The method comprises the following steps: acquiring the coil temperature of an inner coil of an air conditioner; and when the temperature of the coil pipe meets the preset compressor frequency conversion condition and is continuously set for a long time, controlling the compressor of the air conditioner to switch the operating frequency. The frequency conversion protection method of the compressor is additionally provided with the frequency conversion condition and the time length condition, so that when the air conditioner needs to carry out frequency conversion operation according to a conventional mode, whether the frequency conversion condition and the time length condition are met needs to be judged in advance, and the frequency conversion operation can be carried out only by the air conditioner compressor under the condition that the two conditions are met, so that the compressor needs to be frequently started and stopped for frequency conversion operation under the condition of temperature change of an indoor unit, the working load of the compressor is effectively lightened, and the service life of the compressor is prolonged.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for frequency conversion protection of an air conditioner compressor.
Background
In the existing energy-saving control mode of the air conditioner operation heating mode, when the indoor temperature reaches the target indoor temperature set by a user, an indoor fan generally stops rotating or rotates at a low speed, a compressor also adopts a mode of stopping operating or operating at a low frequency, but a small amount of refrigerant still passes through an internal pipeline of an indoor unit, after the air conditioner continuously operates for a period of time, the internal pressure is overhigh due to the fact that the heat exchange quantity of the indoor unit and the indoor environment is small, at the moment, the operation of the indoor fan needs to be restarted, so that the heat accumulated in the indoor unit is dissipated, the internal pressure of the indoor unit is reduced, at the moment, the system can automatically judge that the heating effect is poor due to the fact that the internal temperature of the indoor unit is low, and therefore the air conditioner performs frequency increasing treatment on the compressor; this also triggers high load protection of the air conditioner, which causes the air conditioner to once again perform a compressor down-conversion process. Therefore, in the long time process that the indoor temperature reaches the target indoor temperature, the compressor needs to be frequently started and stopped and frequency-up and down regulated due to the change of the internal temperature of the indoor unit, which causes the overload of the air conditioner compressor and easily damages the compressor.
For example, for an existing "one-driving-two" or "one-driving-many" air conditioner type, when the air conditioner type operates in a heating mode, when the indoor temperature of an acting region of one of the indoor units (a) reaches an air conditioner set temperature and the indoor temperature of an acting region of the other indoor unit (B) does not reach the air conditioner set temperature, the indoor fan of the a unit stops rotating, but a small amount of refrigerant still passes through the inside of the a unit, after the air conditioner operates for a period of time, the a unit has poor heat dissipation to the outside, which causes the internal pressure to be too high, at this time, the indoor fan of the a unit needs to be restarted to operate, but when the indoor fan operates, the heat of the a unit is rapidly dissipated, the pressure of the a unit is reduced, at this time, the temperature of an inner coil of the a unit is low, and the system judges that the heating effect is poor, so as to perform frequency increasing processing on a; and then, the indoor fan of the machine A stops running again, the temperature of the inner coil pipe rises rapidly, the compressor carries out high-load protection, and the compressor carries out frequency reduction treatment. Therefore, when the indoor temperature of the action area of the machine A reaches the set temperature of the air conditioner, the frequency of the compressor of the air conditioning system can be increased and decreased continuously along with the starting and stopping of the indoor fan of the machine A, so that the outdoor unit generates large noise, and the service life of the compressor is influenced.
Disclosure of Invention
The invention provides a method and a device for frequency conversion protection of an air conditioner compressor, and aims to solve the problems that the compressor needs to be frequently started, stopped and converted along with the change of the internal temperature of an indoor unit under the condition that the room temperature reaches the target indoor temperature. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the invention, a method for frequency conversion protection of an air conditioner compressor is provided, and the method comprises the following steps: acquiring the coil temperature of an inner coil of an air conditioner; and when the temperature of the coil pipe meets the preset compressor frequency conversion condition and is continuously set for a long time, controlling the compressor of the air conditioner to switch the operating frequency.
Further, the preset compressor frequency conversion condition that the coil pipe temperature satisfies includes: and when the temperature of the coil is less than or equal to the preset frequency increasing temperature threshold value, the temperature of the coil meets the frequency increasing condition of the compressor.
Further, the frequency raising temperature threshold is one or more; before controlling the compressor of the air conditioner to switch the operating frequency, the method further includes: and determining the frequency increasing rate in the process of switching the operating frequency of the compressor according to the frequency increasing temperature threshold value corresponding to the frequency increasing condition met by the temperature of the coil pipe.
Further, the frequency raising temperature threshold is one or more; the set time length comprises a first set time length; before controlling the compressor of the air conditioner to switch the operating frequency, the method further includes: and determining a first set time length for which the temperature of the coil pipe meets the frequency increasing condition of the compressor and needs to last according to the frequency increasing temperature threshold corresponding to the frequency increasing condition met by the temperature of the coil pipe.
Further, the preset compressor frequency conversion condition that the coil pipe temperature satisfies includes: and when the temperature of the coil pipe is greater than or equal to the preset frequency reduction temperature threshold value, the temperature of the coil pipe meets the frequency reduction condition of the compressor.
Further, the frequency reduction temperature threshold is one or more; before controlling the compressor of the air conditioner to switch the operating frequency, the method further includes: and determining the frequency reduction rate in the process of switching the operating frequency of the compressor according to the frequency reduction temperature threshold corresponding to the frequency reduction condition met by the temperature of the coil pipe.
Further, the frequency reduction temperature threshold is one or more; the set time length comprises a second set time length; before controlling the compressor of the air conditioner to switch the operating frequency, the method further includes: and determining a second set time length for which the temperature of the coil pipe meets the frequency reduction condition of the compressor and needs to last according to the frequency reduction temperature threshold corresponding to the frequency reduction condition met by the temperature of the coil pipe.
According to the second aspect of the present invention, there is also provided an apparatus for inverter protection of an air conditioner compressor, the apparatus comprising: the acquiring unit is used for acquiring the coil temperature of an inner coil of the air conditioner; and the switching unit is used for controlling the compressor of the air conditioner to switch the operating frequency when the temperature of the coil pipe meets the preset compressor frequency conversion condition and is continuously set for a long time.
Further, the preset compressor frequency conversion condition that the temperature of the coil pipe meets includes that when the temperature of the coil pipe is smaller than or equal to a preset frequency increasing temperature threshold value, the temperature of the coil pipe meets the frequency increasing condition of the compressor.
Further, the frequency raising temperature threshold is one or more; the apparatus further comprises a first determining subunit for: before the switching unit controls the compressor of the air conditioner to switch the operating frequency, the frequency increasing rate in the process of switching the operating frequency of the compressor is determined according to the frequency increasing temperature threshold value corresponding to the frequency increasing condition met by the temperature of the coil pipe.
The frequency conversion protection method of the compressor is additionally provided with the frequency conversion condition and the time length condition, so that when the air conditioner needs to carry out frequency conversion operation according to a conventional mode, whether the frequency conversion condition and the time length condition are met needs to be judged in advance, and the frequency conversion operation can be carried out only by the air conditioner compressor under the condition that the two conditions are met, so that the compressor needs to be frequently started and stopped for frequency conversion operation under the condition of temperature change of an indoor unit, the working load of the compressor is effectively lightened, and the service life of the compressor is prolonged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart illustrating a method of variable frequency protection for a compressor in accordance with the present invention, according to an exemplary embodiment.
Fig. 2 is a schematic diagram illustrating a change in compressor frequency during an up-conversion process of a compressor according to an exemplary embodiment of the present invention.
FIG. 3 is a schematic diagram illustrating a change in compressor frequency during a compressor downconversion process in accordance with an exemplary embodiment of the present invention.
FIG. 4 is a flow chart illustrating a compressor frequency up-conversion process of the present invention according to an exemplary embodiment.
FIG. 5 is a flow chart illustrating the compressor downconversion process of the present invention according to an exemplary embodiment.
Fig. 6 is a first block diagram illustrating the structure of the apparatus for frequency conversion protection of a compressor according to an exemplary embodiment of the present invention.
Fig. 7 is a block diagram of the compressor inverter protection apparatus according to an exemplary embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
FIG. 1 is a flow chart illustrating a method of variable frequency protection for a compressor in accordance with the present invention, according to an exemplary embodiment.
As shown in fig. 1, the present invention provides a method for frequency conversion protection of an air conditioner compressor, which can be used for performing start-stop and frequency conversion control on the compressor under the condition of temperature change of an indoor unit; specifically, the method mainly comprises the following steps.
S101, acquiring the coil temperature of an inner coil of the air conditioner.
In this embodiment, taking the air conditioner operation heating mode as an example, when the indoor temperature reaches the target indoor temperature set by the user, the indoor fan stops rotating or rotates at a low speed, the compressor stops operating or operates at a low frequency, a small amount of refrigerant passing through the indoor unit mainly flows through the inner coil of the air conditioner, and then heat carried by the refrigerant is dissipated to the internal space of the air conditioner through the inner coil.
In this embodiment, a temperature sensor is disposed at an inner coil of the air conditioner, and can be used to detect a real-time coil temperature of the inner coil during an operation process of the air conditioner; the real-time coil temperature detected by the temperature sensor is used as the coil temperature of the control method.
When the air conditioner starts to execute the flow of the protection method, the current coil temperature detected by the temperature sensor is firstly obtained, and the current coil temperature is used as the coil temperature of the current flow.
And S102, judging whether the temperature of the coil pipe meets the preset compressor frequency conversion condition, if so, executing the step S103, and if not, ending the process.
In this embodiment, the air conditioner is preset with a compressor frequency conversion condition that needs to be satisfied before the compressor performs the frequency conversion operation, and the air conditioner compressor may perform the frequency conversion operation to adjust the operating frequency of the compressor only when the condition of the compressor frequency conversion is satisfied.
In the present embodiment, also taking the heating mode as an example, the cases where the compressor needs to be operated in the frequency conversion mode are mainly divided into the following two types.
(1) Under the condition that the indoor temperature reaches the target indoor temperature, the fan of the indoor unit stops rotating or rotates at a low speed, the compressor stops rotating or operates at a low frequency, the amount of refrigerant flowing through the indoor unit is reduced, the indoor temperature is generally lower than the internal temperature of the indoor unit in winter, heat is transferred from the indoor unit to the indoor environment, the internal temperature of the indoor unit is reduced, the indoor temperature is gradually reduced to be lower than the target indoor temperature under the influence of the outdoor temperature, the air conditioner can not continuously maintain the stability of the target indoor temperature of the indoor environment, the heating effect is poor, therefore, the fan and the compressor of the air conditioner need to be restarted to continuously convey the refrigerant to the indoor unit, and at the moment, the compressor needs to be subjected to frequency increasing.
Therefore, the up-conversion operation control of the compressor in the case (1) is mainly suitable for the frequency adjustment in the process of re-operating the air conditioner and restoring the indoor temperature to the target indoor temperature after the indoor temperature is reduced to the target indoor temperature in the winter condition.
(2) Under the condition that the indoor temperature is close to or lower than the target indoor temperature, because the air conditioner raises the indoor temperature to the target indoor temperature again, in order to achieve the purposes of energy conservation and consumption reduction, a compressor of the air conditioner is generally switched to a shutdown state or is increased from a higher initial frequency to a lower operation frequency so as to reduce the refrigerant conveyed to an indoor unit and avoid the indoor temperature from being higher than the target indoor temperature, and in the process, the compressor needs to perform frequency reduction operation.
Therefore, the down-conversion operation control of the compressor in the case (2) is mainly applicable to the frequency adjustment during the switching of the air conditioning compressor to the shutdown state or the low frequency operation state after the indoor temperature reaches the target indoor temperature under the winter condition.
It should be understood that, because the compressor may perform multiple frequency-up or frequency-down adjustments during the overall operation of the air conditioner, a single frequency-up control process may also be applied to the frequency adjustment of the air conditioner, and the frequency-down operation of the air conditioner still adopts the existing air conditioner frequency-down mode, i.e., the frequency-up operation process of the present invention is combined with the existing frequency-down operation process, so as to achieve an effective compressor protection effect during the frequency-up process of the air conditioner; the aforementioned conventional air conditioning frequency reduction method can be obtained by those skilled in the art according to the prior art, and the present invention is not described herein again.
Or, the control process of the single frequency reduction operation of the protection method of the invention can be applied to the frequency adjustment of the air conditioner, and the frequency increasing operation of the air conditioner still adopts the existing frequency increasing mode of the air conditioner, namely, the frequency reduction operation flow of the invention is combined with the existing frequency increasing operation flow, so that the effective protection function of the compressor can be realized in the frequency reduction process of the air conditioner; the aforementioned conventional air conditioning frequency raising method can be obtained by those skilled in the art according to the prior art, and the present invention is not described herein again.
The main influence of the operating frequency of the air-conditioning compressor is the time length for the indoor temperature to reach the target indoor temperature, and the higher the operating frequency is, the shorter the time length for the indoor temperature to reach the target temperature is; and the lower the operating frequency, the longer the length of time to reach the target indoor temperature. In the case of (2) the down-conversion operation control of the present invention, in which the air conditioner may reach the target indoor temperature at a relatively low operation frequency of the compressor, the down-conversion operation control is to control the operation frequency of the compressor to be gradually lowered from the initial frequency with the relatively low operation frequency as the initial frequency of the down-conversion operation.
Or, the control processes of the frequency increasing operation and the frequency reducing operation of the invention can be applied to the frequency regulation of the same air conditioner, namely, the frequency increasing operation process and the frequency reducing operation process of the invention are combined, so that the control process can play an effective compressor protection role in the whole frequency regulation process of the air conditioner compressor.
In this embodiment, since the change of the operating frequency of the compressor can directly affect the subsequent change of the temperature of the coil, the indoor environment temperature is affected by the change of the temperature of the coil; therefore, the invention judges whether the variable frequency condition of the compressor is met or not according to the temperature condition of the coil pipe, so that the refrigerant generated by the actual running frequency of the compressor after frequency conversion can meet the amount of the refrigerant required by the indoor unit of the air conditioner to maintain the stable indoor environment temperature.
S103, recording the duration of the condition that the temperature of the coil pipe meets the preset frequency conversion condition of the compressor.
In this embodiment, under the influence of factors such as the rotating speed of the fan, the indoor temperature, the outdoor temperature, the temperature of the refrigerant and the like, the temperature of the coil may fluctuate within a short time, and if the fluctuation of the temperature of the coil is too large, the fluctuation value of the temperature of the coil may meet the preset frequency conversion condition of the compressor, so that the compressor of the air conditioner executes frequency conversion operation; however, since the fluctuation time is short, the compressor frequency conversion adjustment is not needed from the overall condition of the air conditioner operation, and therefore, the actual operation frequency of the compressor may not match the current operation state of the air conditioner, which causes additional power consumption.
Therefore, the control flow of the protection method of the invention also needs to record the duration that the temperature of the coil pipe meets the preset compressor frequency conversion condition, that is, the temperature of the coil pipe within a certain time is taken as a reference value for judging whether the frequency conversion condition of the compressor is met, so as to avoid the problem that the frequency conversion condition of the compressor is falsely triggered due to the fluctuation of the temperature of the coil pipe.
And S104, when the temperature of the coil pipe meets the preset compressor frequency conversion condition and is continuously set for a long time, controlling the compressor of the air conditioner to switch the operating frequency.
The frequency conversion protection method of the compressor is additionally provided with the frequency conversion condition and the time length condition, so that when the air conditioner needs to carry out frequency conversion operation according to a conventional mode, whether the frequency conversion condition and the time length condition are met needs to be judged in advance, and the frequency conversion operation can be carried out only by the air conditioner compressor under the condition that the two conditions are met, so that the compressor needs to be frequently started and stopped for frequency conversion operation under the condition of temperature change of an indoor unit, the working load of the compressor is effectively lightened, and the service life of the compressor is prolonged.
The preset compressor frequency conversion condition of the air conditioner comprises a frequency raising condition of the compressor, and can be used for judging whether the compressor performs the frequency raising operation in the (1) th case in the foregoing embodiment.
Specifically, the preset frequency increasing condition of one of the compressors of the present invention is: the temperature of the coil is less than or equal to a preset frequency-rising temperature threshold value; that is, when the coil temperature is less than or equal to the preset frequency-increasing temperature threshold value, the coil temperature meets the frequency-increasing condition of the compressor. In order to achieve a better heating effect, the coil temperature in the air conditioner needs to be higher than the target indoor temperature, and therefore, preferably, the preset boost temperature threshold value in the air conditioner heating mode of the invention is generally higher than the target indoor temperature, so that when the coil temperature is less than or equal to the preset boost temperature threshold value, it can be determined that the heat release efficiency of the coil temperature is reduced and the heating performance is poor, and therefore the indoor temperature cannot be maintained at the target temperature, and at this time, the air conditioner needs to restart the compressor or increase the compressor frequency, that is, the coil temperature meets the boost condition of the compressor under the current working condition.
For example, under the working condition in winter, the target indoor temperature set by the user is 20 ℃, and after the air conditioner operates at the initial set frequency, the indoor temperature reaches the set target indoor temperature of 20 ℃; at this time, the compressor is switched to a stop state or a low frequency operation state. Under the working condition, the frequency-increasing temperature threshold of the compressor can be set to 49 ℃, 50 ℃, 51 ℃ and the like, for example, 51 ℃, when the coil temperature detected by the temperature sensor is 48 ℃, because 48 ℃ is less than the frequency-increasing temperature threshold 51 ℃, the temperature of the coil can be judged to meet the frequency-increasing condition of the compressor under the current working condition, and the compressor needs to be restarted to operate or operated at increased frequency; when the temperature of the coil pipe detected by the temperature sensor is 52 ℃, the temperature of the coil pipe is larger than the frequency increasing temperature threshold value 51 ℃, so that the temperature of the coil pipe can be judged not to meet the frequency increasing condition of the compressor under the current working condition, the air conditioner maintains the current state unchanged, and the protection process is ended.
Preferably, because the target indoor temperature comfortable for users is set differently, the preset boost temperature threshold value is one or more, so that the corresponding boost temperature threshold value is selected according to the actually set target indoor temperature to be matched with the current working condition; for example, the predetermined ramp temperature thresholds of the air conditioner may include 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃, 50 ℃, 51 ℃, 52 ℃, 53 ℃, 54 ℃, 55 ℃, 56 ℃, 57 ℃, 58 ℃ and the like; when the target indoor temperature set by the user is 18 ℃, the corresponding ascending frequency temperature threshold value can be selected to be 47 ℃, 48 ℃ or 49 ℃ and the like.
In the embodiment, after the air conditioner meets the preset frequency increasing condition and the preset duration condition, the air conditioner can be controlled to switch the operating frequency, and the frequency of the compressor is gradually increased to the set target frequency; in the frequency raising process of the compressor, the faster the frequency raising rate is, the shorter the time to reach the target frequency is, and the slower the frequency raising rate is, the longer the time to reach the target frequency is. Therefore, in order to shorten the time for the air conditioner compressor to reach the target frequency and avoid the unstable condition of the compressor caused by the over-fast frequency change of the compressor, the method of the invention can also determine the frequency increasing rate in the process of switching the running frequency of the compressor according to the frequency increasing temperature threshold value corresponding to the frequency increasing condition met by the temperature of the coil.
For example, the invention presets a first correlation between the frequency-increasing temperature threshold and the frequency-increasing rate, such as the frequency-increasing temperature threshold of 45 ℃ corresponding to the frequency-increasing rate of 1Hz/s, the frequency-increasing temperature threshold of 50 ℃ corresponding to the frequency-increasing rate of 1.5Hz/s, and the frequency-increasing temperature threshold of 60 ℃ corresponding to the frequency-increasing rate of 2 Hz/s. Optionally, the values of the frequency-raising rates corresponding to different frequency-raising temperature thresholds may be consistent or inconsistent, depending on the model of the compressor and the heat exchange performance of the air conditioner.
Therefore, when the temperature of the coil pipe of the air conditioner meets the frequency raising condition and the time length condition of the compressor, the corresponding frequency raising rate can be found and obtained from the first incidence relation according to the frequency raising temperature threshold value of the frequency raising condition, in the frequency raising operation process of the compressor, the compressor is raised from the initial frequency to the target operation frequency at the frequency raising rate, and the heat exchange efficiency of the air conditioner and the stability of system operation can be effectively guaranteed.
Similarly, in order to improve the judgment accuracy of the air conditioner compressor, the invention also respectively sets corresponding first set time lengths which meet the requirement of the compressor on the frequency increasing condition for different frequency increasing temperature thresholds; therefore, before step S104 in the foregoing embodiment, the protection control process of the present invention further needs to determine a first set time period for which the coil temperature needs to be maintained in the frequency increasing condition of the compressor according to the frequency increasing temperature threshold corresponding to the frequency increasing condition that the coil temperature satisfies.
Preferably, because the temperature of the coil pipe is influenced by external factors to generate fluctuation in many cases when the temperature of the coil pipe is low, for the ascending frequency temperature threshold value with a small value, the time length of the corresponding first set time length is also longer; and for the frequency-increasing temperature threshold with a larger value, the time length of the second set time length corresponding to the device is also longer.
For example, a second correlation between the frequency-increasing temperature threshold and the first set time is preset in the invention, for example, the frequency-increasing temperature threshold is 45 ℃ corresponding to the first set time of 5min, the frequency-increasing temperature threshold is 50 ℃ corresponding to the first set time of 3min, and the frequency-increasing temperature threshold is 60 ℃ corresponding to the first set time of 2 min. Optionally, the values of the first set time duration corresponding to different raising frequency temperature thresholds may be consistent or inconsistent, depending on the model of the compressor and the heat exchange performance of the air conditioner.
Thus, when the temperature of the coil of the air conditioner meets the frequency raising condition of the compressor, the corresponding first set time length can be searched and obtained from the second association relation according to the frequency raising temperature threshold of the frequency raising condition met, and the duration recorded in the step S103 can be judged in the step S104. Therefore, by selecting different first set time lengths, the interference influence of external factors on the judgment process in the protection process can be reduced, and the control accuracy is improved.
FIG. 2 is a schematic diagram illustrating a change in compressor frequency during an up-conversion process of the compressor of the present invention according to an exemplary embodiment; in the application scenario shown in fig. 2, the air conditioner executes the protection control process of the present invention multiple times in one up-conversion process, where the broken line in the diagram represents the frequency variation of the air conditioner compressor, where the straight line segment of the broken line is the first set time length in each protection control process, and at this time, the frequency of the compressor is kept unchanged at the current frequency; the slope of the slope is the frequency increasing rate determined according to the frequency increasing temperature threshold.
The preset compressor frequency conversion condition of the air conditioner comprises a compressor frequency reduction condition, and can be used for judging whether the compressor performs the frequency reduction operation in the case of the (2) in the foregoing embodiment.
Specifically, the frequency reduction condition of one of the preset compressors of the present invention is as follows: the temperature of the coil is greater than or equal to a preset frequency reduction temperature threshold; that is, when the temperature of the coil is greater than or equal to the preset frequency reduction temperature threshold, the temperature of the coil meets the frequency reduction condition of the compressor. In order to achieve a good energy-saving effect, the quantity of refrigerants conveyed to an indoor unit of a general air conditioner is not too large, so that the phenomenon that the coil pipe emits too much heat to the indoor environment due to overhigh temperature is avoided, and meanwhile, the indoor temperature exceeds the target indoor temperature can also be avoided; or when the indoor temperature reaches the target temperature, the refrigerant input is controlled to be reduced so as to reduce the heat energy consumption. Therefore, when the temperature of the coil pipe is smaller than or equal to the preset frequency reduction temperature threshold value, the temperature of the coil pipe can be judged to exceed the set temperature of the coil pipe, and therefore the air conditioner needs to stop the compressor or reduce the frequency of the compressor, namely the temperature of the coil pipe meets the frequency reduction condition of the compressor under the current working condition.
For example, under the working condition in winter, the target indoor temperature set by the user is 20 ℃, and after the air conditioner operates at the initial set frequency, the indoor temperature reaches the set target indoor temperature of 20 ℃; under the working condition, the frequency reduction temperature threshold of the compressor can be set to 55 ℃, 57 ℃, 60 ℃ and the like, taking 57 ℃ as an example, when the coil temperature detected by the temperature sensor is 59 ℃, the coil temperature can be judged to meet the frequency reduction condition of the compressor under the current working condition because the 59 ℃ is higher than the frequency reduction temperature threshold 57 ℃, and the compressor needs to stop running or reduce frequency running; when the temperature of the coil pipe detected by the temperature sensor is 52 ℃, the temperature of the coil pipe is judged to be not satisfied with the frequency reduction condition of the compressor under the current working condition because the temperature of the coil pipe is less than the frequency reduction temperature threshold value of 57 ℃, the air conditioner maintains the current state, and the protection process is finished.
Preferably, because the target indoor temperature comfortable for users is set differently, the preset frequency reduction temperature threshold value is one or more, so that the corresponding frequency reduction temperature threshold value is selected according to the actually set target indoor temperature to be matched with the current working condition; for example, the predetermined temperature threshold for air conditioning may include 54 ℃, 55 ℃, 56 ℃, 57 ℃, 58 ℃, 59 ℃, 60 ℃, 61 ℃, 62 ℃, 63 ℃, etc.; when the target indoor temperature set by the user is 18 ℃, the corresponding down-conversion temperature threshold can be selected to be 55 ℃, 56 ℃ or 57 ℃.
In the embodiment, after the air conditioner meets the preset frequency reduction condition and duration condition, the air conditioner can be controlled to switch the operating frequency, and the frequency of the compressor is gradually reduced to the set target frequency or is stopped; in the frequency reduction process of the compressor, the faster the frequency reduction rate is, the shorter the time to reach the target frequency is, and the slower the frequency reduction rate is, the longer the time to reach the target frequency is. Therefore, in order to shorten the time for the air conditioner compressor to reach the target frequency and avoid the unstable compressor caused by the over-fast frequency change of the compressor, the method of the invention can also determine the frequency reduction rate in the process of switching the operating frequency of the compressor according to the frequency reduction temperature threshold value corresponding to the frequency reduction condition met by the temperature of the coil pipe.
For example, the third correlation between the down-conversion temperature threshold and the down-conversion rate is preset in the invention, for example, the down-conversion temperature threshold is 55 ℃ corresponding to the down-conversion rate of 1Hz/s, the down-conversion temperature threshold is 60 ℃ corresponding to the down-conversion rate of 1.5Hz/s, and the down-conversion temperature threshold is 65 ℃ corresponding to the down-conversion rate of 2 Hz/s. Optionally, the frequency reduction rates corresponding to different frequency reduction temperature thresholds may be consistent or inconsistent, depending on the model of the compressor and the heat exchange performance of the air conditioner.
Therefore, when the temperature of the coil pipe of the air conditioner meets the frequency reduction condition and the time length condition of the compressor, the corresponding frequency reduction rate can be searched and obtained from the third correlation according to the frequency reduction temperature threshold value of the frequency reduction condition met by the temperature of the coil pipe of the air conditioner, in the frequency reduction operation process of the compressor, the compressor is reduced from the initial frequency to the target operation frequency or the shutdown state at the frequency reduction rate, and the heat exchange efficiency of the air conditioner and the stability of system operation can be effectively guaranteed.
Similarly, in order to improve the accuracy of the judgment of the air conditioner compressor, the invention also respectively sets corresponding second set time lengths for meeting the requirement of the compressor on the frequency reduction condition for different frequency reduction temperature thresholds; therefore, before step S104 in the foregoing embodiment, the protection control process of the present invention further needs to determine a second set duration for which the coil temperature meets the frequency-down condition of the compressor, according to the frequency-down temperature threshold corresponding to the frequency-down condition met by the coil temperature.
Preferably, because the temperature of the coil pipe is influenced by external factors to generate fluctuation more frequently when the temperature of the coil pipe is lower, for the frequency reduction temperature threshold value with a smaller value, the time length of the corresponding second set time length is longer; for the lower frequency temperature threshold with a larger value, the time length of the second set time length corresponding to the device is also longer.
For example, a fourth correlation between the down-conversion temperature threshold and the second set time is preset in the present invention, for example, 55 ℃ of the down-conversion temperature threshold corresponds to the second set time of 5min, 60 ℃ of the down-conversion temperature threshold corresponds to the second set time of 3min, and 65 ℃ of the down-conversion temperature threshold corresponds to the second set time of 2 min. Optionally, the values of the second set time duration corresponding to different down-conversion temperature thresholds may be consistent or inconsistent, depending on the model of the compressor and the heat exchange performance of the air conditioner.
Thus, when the temperature of the coil of the air conditioner meets the frequency reduction condition of the compressor, the corresponding second set time length can be searched and obtained from the fourth association relation according to the frequency reduction temperature threshold of the frequency reduction condition met by the temperature of the coil of the air conditioner, and the duration recorded in the step S103 can be judged in the step S104. Therefore, by selecting different second set time lengths, the interference influence of external factors on the judgment process in the protection process can be reduced, and the control accuracy is improved.
FIG. 3 is a schematic illustration of a compressor frequency variation of the compressor downconversion process of the present invention, in accordance with an exemplary embodiment; in the application scenario shown in fig. 3, the air conditioner executes the protection control process of the present invention multiple times in one down-conversion process, where the broken line in the diagram represents the frequency variation of the air conditioner compressor, where the straight line segment of the broken line is the second set time duration in each protection control process, and at this time, the frequency of the compressor is kept unchanged at the current frequency; the slope of the oblique line is the frequency reduction rate determined according to the frequency reduction temperature threshold.
The following describes a specific process of the method for inverter protection of an air conditioner compressor according to the present invention in detail with reference to specific embodiments.
FIG. 4 is a flow chart illustrating a compressor frequency up-conversion process of the present invention according to an exemplary embodiment; in the application scenario shown in fig. 4, the specific control flow of the compressor frequency-up process of the present invention is as follows.
S401, operating an air conditioner to heat.
S402, acquiring indoor temperature.
In this embodiment, the air conditioner is provided with an indoor temperature sensor, and can be used to detect the indoor ambient temperature so as to judge whether the indoor ambient temperature reaches the target refrigeration temperature set by the user.
And S403, judging whether the indoor temperature reaches the target indoor temperature set by the user, if so, executing the step S404, and if not, returning to execute the step S402.
And S404, controlling the compressor of the air conditioner to stop running or reducing the compressor to the set low-frequency running.
In the embodiment, the frequency reduction operation flow in the process of stopping operation or reducing the operation of the air conditioner compressor to low frequency is realized according to the existing frequency reduction operation flow; that is, in the present embodiment, the frequency-increasing operation flow of the present invention is combined with the existing frequency-reducing operation flow, and after the air conditioner completes the frequency-reducing operation through the existing frequency-reducing operation flow, the operation frequency of the compressor is increased through the frequency-increasing operation flow of the present invention.
S405, acquiring the coil temperature of the inner coil of the air conditioner.
And S406, judging whether the temperature of the coil pipe meets a preset frequency increasing condition of the compressor, if so, executing a step S407, and if not, ending the process.
In this embodiment, it is mainly exemplified that the air conditioner executes the protection control process once, and when the air conditioner executes the protection control process for multiple times, the step S405 is executed again when the coil temperature in the step S406 does not satisfy the preset compressor frequency-increasing condition.
S407, determining a first set time length for which the temperature of the coil pipe meets the frequency increasing condition of the compressor and needs to last according to the frequency increasing temperature threshold corresponding to the frequency increasing condition met by the temperature of the coil pipe.
In this embodiment, the air conditioner is preset with an association relationship between the frequency-increasing temperature threshold and the first set time length, so that when the temperature of the coil meets the frequency-increasing condition, the corresponding first set time length can be found according to the frequency-increasing temperature threshold.
And S408, recording the duration of the temperature of the coil pipe meeting the frequency increasing condition of the compressor.
In this embodiment, the duration is the duration that is recorded after the coil temperature meets the preset compressor up-frequency condition, and the duration is the duration of a single time.
S409, judging whether the duration is greater than or equal to a first set duration, and if so, executing a step S410; if not, the process ends.
In this embodiment, if the single duration does not satisfy the first set duration, it is described that at the last time of the duration, the temperature of the coil does not satisfy the frequency increasing condition of the compressor, and the protection control process ends this time.
S410, determining the frequency increasing rate in the process of switching the operating frequency of the compressor according to the frequency increasing temperature threshold value corresponding to the frequency increasing condition met by the temperature of the coil pipe.
In this embodiment, the air conditioner is preset with an association relationship between the frequency-increasing temperature threshold and the frequency-increasing rate, so that when the temperature of the coil meets the frequency-increasing condition, the corresponding frequency-increasing rate can be found according to the frequency-increasing temperature threshold.
And S411, controlling the compressor to increase the running frequency of the compressor at the determined frequency increasing rate.
FIG. 5 is a flow chart illustrating the compressor downconversion process of the present invention in accordance with an exemplary embodiment; in the application scenario shown in fig. 5, the specific control flow of the compressor down-conversion process of the present invention is as follows.
And S501, operating an air conditioner in a heating mode.
And S502, acquiring the target indoor temperature set by the user.
In this embodiment, the user may set a desired indoor temperature, which is a target indoor temperature to be reached by the air conditioner operation, through the remote controller or the control panel.
S503, controlling the air conditioner to increase the running frequency of the compressor.
In the embodiment, the operation process of raising the frequency of the air conditioner compressor is realized according to the existing frequency raising operation process; that is, in this embodiment, the frequency-reducing operation flow of the present invention is combined with the existing frequency-increasing operation flow, and after the air conditioner completes the frequency-increasing operation through the existing frequency-increasing operation flow, the operating frequency of the compressor is reduced through the frequency-reducing operation flow of the present invention.
In some embodiments, the air conditioner may also be operated at the set operating frequency after acquiring the target indoor temperature until the target indoor temperature is reached.
And S504, judging whether the indoor temperature reaches the target indoor temperature set by the user, if so, executing the step S505, and if not, returning to execute the step S503.
In this embodiment, if the air conditioner is operated at the set operation frequency, when the indoor temperature does not reach the target indoor temperature set by the user, the compressor continues to be operated at the operation frequency.
And S505, acquiring the coil temperature of the inner coil of the air conditioner.
S506, judging whether the temperature of the coil pipe meets the preset frequency reduction condition of the compressor, if so, executing the step S507, and if not, ending the process.
In this embodiment, it is mainly exemplified that the air conditioner executes the protection control process once, and when the air conditioner executes the protection control process for multiple times, the step S505 is executed again when the coil temperature in the step S506 does not satisfy the preset compressor frequency reduction condition.
And S507, determining a second set time length for which the temperature of the coil pipe meets the frequency reduction condition of the compressor and needs to last according to the frequency reduction temperature threshold corresponding to the frequency reduction condition met by the temperature of the coil pipe.
In this embodiment, the air conditioner is preset with an association relationship between the down-conversion temperature threshold and the second set time length, so that when the down-conversion condition that the temperature of the coil pipe satisfies, the corresponding second set time length can be found according to the down-conversion temperature threshold.
And S508, recording the duration of the condition that the temperature of the coil pipe meets the frequency reduction condition of the compressor.
In this embodiment, the duration is a single duration that begins recording after the coil temperature meets the preset compressor down condition.
S509, judging whether the duration is greater than or equal to a second set duration, and if so, executing the step S510; if not, the process ends.
In this embodiment, if the single duration does not satisfy the second set duration, it indicates that at the last time of the duration, the temperature of the coil does not satisfy the frequency reduction condition of the compressor, and the protection control process ends this time.
S510, determining the frequency reduction rate in the process of switching the operating frequency of the compressor according to the frequency reduction temperature threshold corresponding to the frequency reduction condition met by the temperature of the coil pipe.
In this embodiment, the air conditioner is preset with an association relationship between the down-conversion temperature threshold and the down-conversion rate, so that when the temperature of the coil meets the down-conversion condition, the corresponding down-conversion rate can be found according to the down-conversion temperature threshold.
And S511, controlling the compressor to reduce the running frequency of the compressor at the determined frequency reduction rate.
In the present embodiment, the winter condition of the air conditioner operating in the heating mode is mainly taken as an example, but it should be understood that the frequency conversion protection method of the compressor of the present invention may also be adopted in the summer condition of the air conditioner operating in the cooling mode.
The method for frequency conversion protection of the compressor can be applied to a conventional one-to-one air conditioner, and can also be applied to frequency up-down control of the compressor of the one-to-two air conditioner and the one-to-many air conditioner, so that the frequency up-down of the compressor can be controlled by judging whether the frequency conversion condition and the time length condition are met or not under the condition that the indoor temperature reaches or approaches to the set temperature when the indoor unit operates, the problem of compressor loss caused by too fast frequency change of the compressor is avoided, and the defects that a large amount of noise is generated due to frequent frequency up-down of the compressor and user experience is influenced are overcome.
Fig. 6 is a first block diagram illustrating the structure of the apparatus for frequency conversion protection of a compressor according to an exemplary embodiment of the present invention.
As shown in fig. 6, the present invention further provides an apparatus for frequency conversion protection of an air conditioner compressor, which includes an obtaining unit 610 and a switching unit 620.
The obtaining unit 610 is configured to obtain a coil temperature of an inner coil of an air conditioner.
And a switching unit 620, configured to control the compressor of the air conditioner to switch the operating frequency when the temperature of the coil pipe meets a preset compressor frequency conversion condition and is continuously set for a long time.
In some embodiments, the preset compressor frequency conversion condition that the coil temperature satisfies includes: and when the temperature of the coil is less than or equal to the preset frequency increasing temperature threshold value, the temperature of the coil meets the frequency increasing condition of the compressor.
In some embodiments, switching unit 620 is pre-stored with one or more ramp temperature thresholds.
The apparatus further includes a first determining subunit 631, configured to determine, before the switching unit 620 controls the compressor of the air conditioner to switch the operation frequency, an up-conversion rate during the operation frequency switching process of the compressor according to an up-conversion temperature threshold corresponding to an up-conversion condition that is met by the coil temperature.
In some embodiments, the apparatus further includes a second determining subunit 632, configured to determine, before the switching unit 620 switches the operating frequency of the compressor of the air conditioner, a first set time period for which the coil temperature needs to be maintained for satisfying the frequency increasing condition of the compressor according to the frequency increasing temperature threshold corresponding to the frequency increasing condition satisfied by the coil temperature.
In some embodiments, the preset compressor frequency conversion condition that the coil temperature satisfies includes: and when the temperature of the coil pipe is greater than or equal to the preset frequency reduction temperature threshold value, the temperature of the coil pipe meets the frequency reduction condition of the compressor.
In some embodiments, switching unit 620 is pre-stored with one or more down temperature thresholds.
In some embodiments, the apparatus further includes a third determining subunit 633, configured to determine a frequency reduction rate during the switching of the operating frequency of the compressor according to a frequency reduction temperature threshold corresponding to a frequency reduction condition that is met by the temperature of the coil before the switching unit controls the switching of the operating frequency of the compressor of the air conditioner.
In some embodiments, the apparatus further includes a fourth determining subunit 644, configured to determine, before the switching unit 620 controls the compressor of the air conditioner to switch the operating frequency, a second set time period for which the coil temperature needs to last when the coil temperature meets the frequency reduction condition of the compressor according to the frequency reduction temperature threshold corresponding to the frequency reduction condition met by the coil temperature.
Fig. 7 is a block diagram of the compressor inverter protection apparatus according to an exemplary embodiment of the present invention. As shown in fig. 7, the apparatus includes an acquisition unit 710, a switching unit 720, a first determination sub-unit 731, a second determination sub-unit 732, a third determination sub-unit 733, and a fourth determination sub-unit 734.
Specifically, the obtaining unit 710 is configured to obtain a coil temperature of an inner coil of the air conditioner.
And the switching unit 720 is used for controlling the compressor of the air conditioner to switch the operating frequency when the temperature of the coil pipe meets the preset compressor frequency conversion condition and is continuously set for a long time.
The switching unit 720 is pre-stored with one or more ramp-up temperature thresholds and one or more ramp-down temperature thresholds.
The first determining subunit 731 is configured to determine, before the switching unit 720 controls the compressor of the air conditioner to switch the operating frequency, an up-conversion rate during the process of switching the operating frequency of the compressor according to an up-conversion temperature threshold corresponding to an up-conversion condition that the coil temperature satisfies.
The second determining subunit 732 is configured to determine, before the switching unit 720 controls the compressor of the air conditioner to switch the operating frequency, a first set time duration that the coil temperature needs to last when the coil temperature meets the frequency increasing condition of the compressor according to the frequency increasing temperature threshold corresponding to the frequency increasing condition met by the coil temperature.
The third determining subunit 733, configured to determine, before the switching unit controls the compressor of the air conditioner to switch the operating frequency, a frequency reduction rate in the process of switching the operating frequency of the compressor according to a frequency reduction temperature threshold corresponding to a frequency reduction condition that is met by the temperature of the coil.
The fourth determining subunit 744, is configured to determine, before the switching unit 720 controls the compressor of the air conditioner to switch the operating frequency, a second set duration that the frequency reduction condition of the compressor needs to be continued when the coil temperature satisfies the frequency reduction condition according to the frequency reduction temperature threshold corresponding to the frequency reduction condition that the coil temperature satisfies.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (5)
1. A method for frequency conversion protection of an air conditioner compressor is characterized by comprising the following steps:
acquiring the coil temperature of an inner coil of the air conditioner;
when the temperature of the coil pipe meets the preset compressor frequency conversion condition and is continuously set for a long time, controlling the compressor of the air conditioner to switch the operating frequency;
wherein, the coil pipe temperature satisfies predetermined compressor frequency conversion condition, includes: when the temperature of the coil pipe is smaller than or equal to a preset frequency-rising temperature threshold value, the temperature of the coil pipe meets the frequency-rising condition of the compressor; the raising frequency temperature threshold is one or more, and before controlling the compressor of the air conditioner to switch the operating frequency, the method further comprises the following steps:
determining a first set time length for which the temperature of the coil pipe meets the frequency increasing condition of the compressor and needs to last according to the frequency increasing temperature threshold corresponding to the frequency increasing condition met by the temperature of the coil pipe; the set duration comprises the first set duration;
or, the coil pipe temperature satisfies the preset compressor frequency conversion condition, including: when the temperature of the coil pipe is greater than or equal to a preset frequency reduction temperature threshold value, the temperature of the coil pipe meets the frequency reduction condition of the compressor; the frequency-reducing temperature threshold is one or more, and before controlling the compressor of the air conditioner to switch the operating frequency, the method further comprises the following steps:
determining a second set time length for which the temperature of the coil pipe meets the frequency reduction condition of the compressor and needs to last according to the frequency reduction temperature threshold corresponding to the frequency reduction condition met by the temperature of the coil pipe; the set duration comprises the second set duration.
2. The method of claim 1, wherein before controlling the compressor of the air conditioner to switch the operating frequency, the method further comprises:
and determining the frequency increasing rate of the compressor in the process of switching the operating frequency according to the frequency increasing temperature threshold value corresponding to the frequency increasing condition met by the temperature of the coil pipe.
3. The method of claim 1, wherein before controlling the compressor of the air conditioner to switch the operating frequency, the method further comprises:
and determining the frequency reduction rate in the process of switching the operating frequency of the compressor according to the frequency reduction temperature threshold corresponding to the frequency reduction condition met by the temperature of the coil pipe.
4. An air condition compressor frequency conversion protection device is characterized in that the device comprises:
the acquisition unit is used for acquiring the coil temperature of the inner coil of the air conditioner;
the switching unit is used for controlling the compressor of the air conditioner to switch the operating frequency when the temperature of the coil pipe meets the preset compressor frequency conversion condition and is continuously set for a long time;
wherein, the coil pipe temperature satisfies predetermined compressor frequency conversion condition, includes: when the temperature of the coil pipe is smaller than or equal to a preset frequency-rising temperature threshold value, the temperature of the coil pipe meets the frequency-rising condition of the compressor; the switching unit has one or more of the ramp-up temperature thresholds pre-stored therein, and the apparatus further includes:
the second determining subunit is configured to determine, before the switching unit controls the compressor of the air conditioner to switch the operating frequency, a first set duration for which the coil temperature satisfies the frequency boost condition of the compressor and needs to last according to the frequency boost temperature threshold corresponding to the frequency boost condition satisfied by the coil temperature; the set duration comprises the first set duration;
or, the coil pipe temperature satisfies the preset compressor frequency conversion condition, including: when the temperature of the coil pipe is greater than or equal to a preset frequency reduction temperature threshold value, the temperature of the coil pipe meets the frequency reduction condition of the compressor; the switching unit has one or more of the downconversion temperature thresholds prestored therein, and the apparatus further includes:
the fourth determining subunit is configured to determine, before the switching unit controls the compressor of the air conditioner to switch the operating frequency, a second set duration for which the coil temperature meets the frequency reduction condition of the compressor and needs to last according to the frequency reduction temperature threshold corresponding to the frequency reduction condition met by the coil temperature; the set duration comprises the second set duration.
5. The apparatus of claim 4, further comprising a first determining subunit configured to:
before the switching unit controls the compressor of the air conditioner to switch the operating frequency, determining the frequency increasing rate in the process of switching the operating frequency of the compressor according to the frequency increasing temperature threshold value corresponding to the frequency increasing condition met by the temperature of the coil.
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| CN109751719A (en) * | 2018-12-03 | 2019-05-14 | 珠海格力电器股份有限公司 | A kind of air conditioning control method and device |
| CN110848898B (en) * | 2019-10-11 | 2021-02-12 | 珠海格力电器股份有限公司 | Control method for preventing air conditioner load conversion from stopping, computer readable storage medium and air conditioner |
| CN110848899B (en) * | 2019-10-12 | 2021-11-30 | 珠海格力电器股份有限公司 | Variable frequency air conditioner operation control method, computer readable storage medium and air conditioner |
| CN110779161B (en) * | 2019-11-18 | 2021-08-27 | 宁波奥克斯电气股份有限公司 | Control method and device for compressor overload protection and air conditioner |
| CN111076493A (en) * | 2019-12-03 | 2020-04-28 | 海信（山东）冰箱有限公司 | Refrigerator operation mode control method and refrigerator |
| CN111397125B (en) * | 2020-03-27 | 2021-09-21 | 广东美的制冷设备有限公司 | Sterilization control method and device of air conditioner, storage medium and control equipment |
| CN111380173B (en) * | 2020-03-27 | 2022-01-28 | 广东美的制冷设备有限公司 | Control method and device of air conditioner and air conditioner |
| CN111426041B (en) * | 2020-04-13 | 2022-08-19 | 青岛海尔空调电子有限公司 | Method and system for quickly stabilizing frequency of variable frequency air conditioner compressor and air conditioner device |
| CN111780362B (en) * | 2020-07-03 | 2022-03-11 | 海信（山东）空调有限公司 | Air conditioner and control method thereof |
| CN113154621B (en) * | 2021-03-10 | 2022-05-13 | 宁波奥克斯电气股份有限公司 | Compressor frequency control method and device and air conditioner |
| CN113154620B (en) * | 2021-03-10 | 2022-05-13 | 宁波奥克斯电气股份有限公司 | Compressor frequency control method and device and air conditioner |
| CN113028573B (en) * | 2021-04-20 | 2022-07-05 | 宁波奥克斯电气股份有限公司 | Air conditioner low-temperature heating control method and device and air conditioner |
| CN113251638B (en) * | 2021-04-22 | 2022-06-03 | 重庆海尔空调器有限公司 | Control method and device for air conditioner compressor and air conditioner |
| CN114234447B (en) * | 2021-12-23 | 2023-05-26 | 广东纽恩泰新能源科技发展有限公司 | Method and device for controlling frequency of low-temperature variable-frequency heat pump compressor |
| CN114963448B (en) * | 2022-05-20 | 2023-05-12 | 珠海格力电器股份有限公司 | Air conditioner control method and device, air conditioner and storage medium |
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Effective date of registration: 20201030 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |