CN113864975B - Low-temperature refrigeration control method and device of variable frequency air conditioner and air conditioner - Google Patents
Low-temperature refrigeration control method and device of variable frequency air conditioner and air conditioner Download PDFInfo
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- CN113864975B CN113864975B CN202111154315.8A CN202111154315A CN113864975B CN 113864975 B CN113864975 B CN 113864975B CN 202111154315 A CN202111154315 A CN 202111154315A CN 113864975 B CN113864975 B CN 113864975B
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
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Abstract
The provided low-temperature refrigeration control method for the inverter air conditioner comprises the following steps: when the air conditioner enters a low-temperature refrigeration outdoor fan control mode, the temperature T of an outdoor side coil is acquired Outer tube Outdoor ambient temperature T Outer ring The gear for operating the indoor fan and the phase current of the compressor; according to T Outer ring Determining the gear range of the outdoor fan according to the gear of the indoor fan; according to the T Outer tube The phase current of the compressor and the gear range of the outdoor fan are used for determining and adjusting the running gear of the outdoor fan. The scheme of the invention can avoid the problem that the inner side heat exchanger frosts in the low-temperature refrigeration operation process; the problem that the shutdown is protected due to the fact that the gear rotating speed of the outer fan is reduced and the compressor is loaded due to intermittent shutdown is solved; the phenomenon that overload frequency reduction is frequently caused by temperature fluctuation of the T outer pipe is avoided, and therefore refrigerating capacity is improved.
Description
Technical Field
The invention relates to the field of intelligent control, in particular to a low-temperature refrigeration control method and device of a variable frequency air conditioner and the air conditioner.
Background
At present, the application range of the air conditioner is more and more extensive, and the air conditioner is required to adjust and control parameters such as the temperature, the humidity and the like of the indoor environment in many special environments. For example, in data rooms in australia, north america and northern areas of our country, room equipment that works uninterruptedly for a long time needs to be cooled by air conditioner refrigeration in a low-temperature environment.
When the external environment temperature is lower (lower than 15 ℃) and the air conditioner needs to perform refrigeration operation, the load of the air conditioner is light, the heat dissipation effect of the outdoor heat exchanger is good under the condition, if the windshields of the inner and outer units are not matched, for example, the gear of the inner fan is low, and the windshield of the outer unit is too high, the indoor heat exchanger is easy to frost, the compressor is easy to hit by liquid, and the capacity and the reliability of the air conditioner are influenced; the air conditioner has the problems that the rotating speed of an outdoor fan is reduced frequently or the outdoor fan is stopped discontinuously in the refrigeration operation in a low-temperature environment, so that the load of a compressor of an outdoor unit is easily loaded, the protection shutdown is caused, and the like.
In the refrigeration operation of the air conditioner in a low-temperature environment, the outdoor fan is frequently subjected to rotating speed increase, reduction or intermittent shutdown, so that the temperature of an outdoor coil pipe is fluctuated, overload frequency reduction is easily caused frequently, and the refrigeration capacity is influenced. Therefore, a solution for implementing low-temperature refrigeration control on the inverter air conditioner is needed in the prior art.
The above information disclosed in this background section is only for further understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention provides a low-temperature refrigeration control method and device of a variable frequency air conditioner and the air conditioner. The scheme of the invention can solve the problem that the inner machine side heat exchanger frosts due to the fact that the windshields of the inner machine and the outer machine are not matched under low-temperature refrigeration; the problem of overload protection shutdown of the compressor caused by poor outdoor side heat exchange due to low fan gear is solved; the problem that the refrigeration capacity of the air conditioner is affected due to the fact that overload frequency reduction is frequently caused by temperature fluctuation of the T outer pipe can be avoided.
The invention provides a low-temperature refrigeration control method of an inverter air conditioner, which comprises the following steps: s1: when the air conditioner enters a low-temperature refrigeration outdoor fan control mode, the temperature T of an outdoor side coil is acquired Outer tube Outdoor ambient temperature T Outer ring The gear for operating the indoor fan and the phase current of the compressor; s2: according to T Outer ring Determining the gear range of the outdoor fan according to the gear of the indoor fan; s3: according to said T Outer tube Phase current of the compressor and a gear range of the outdoor fanAnd fixing and adjusting the running gear of the outdoor fan.
According to an embodiment of the present invention, before the step S1, when the air conditioner is in the modulated cooling mode and the compressor is in the operating state, if the outdoor ambient temperature is continuously detected to be less than the preset temperature for the preset time period, it is determined that the air conditioner enters the outdoor fan control mode of low temperature cooling.
According to an embodiment of the invention, the preset temperature is the entering temperature of the air-conditioning low-temperature refrigeration motor, the value of the preset temperature is less than or equal to 16 ℃, and the value of the preset time period ranges from 60 seconds to 90 seconds.
According to an embodiment of the present invention, wherein in step S3, according to the T Outer tube The priority for determining and adjusting the operation gear of the outdoor fan is higher than the priority for determining and adjusting the outdoor fan according to the phase current of the compressor.
According to an embodiment of the present invention, the step S2 further includes: according to the T of the air conditioner Outer ring The range of the gears of the outdoor fan is determined by a mapping table of the temperature range of the indoor fan, the wind gear of the indoor fan and the maximum and minimum wind gears allowed by the outdoor fan.
According to an embodiment of the present invention, in the step S3, when T is greater than or equal to T Outer tube T for not less than full-speed running of outdoor fan Outer tube When the temperature is in the threshold value A, the outdoor fan is forced to operate at the highest gear; when the outdoor fan operates at low speed, the threshold value B of the temperature of the outer pipe is less than or equal to T Outer tube < T at full speed operation of outdoor Fan Outer tube And when the temperature is at the threshold A and the indoor fan is in a stop state, the outdoor fan is forced to operate at a low gear.
According to an embodiment of the present invention, in the step S3, when the phase current of the compressor is greater than or equal to the phase current threshold I when the outdoor fan operates at full speed, the outdoor fan operates at the highest gear; when the phase current threshold value II of the compressor is not more than the phase current threshold value I of the compressor when the compressor is in full-speed operation, the outdoor fan is increased by 1 gear to operate on the basis of the current gear every preset time until the highest gear of the gear range is reached; when the phase current threshold III of the compressor is less than or equal to the phase current threshold II of the compressor, the outdoor fan maintains the current running gear; and when the phase current of the compressor is less than the phase current threshold III of the compressor, reducing the 1-gear operation of the outdoor fan on the basis of the current gear every preset time until the lowest gear of the gear range is reached.
According to an embodiment of the present invention, wherein said T Outer tube The threshold value a of the temperature is set as: t is Limit of D, said T Outer tube The threshold B of the temperature is set as: t is Limit of -e, wherein T Limit of The temperature of the temperature limit frequency point of the outer tube, d and e are constants, wherein e>d。
According to an embodiment of the invention, wherein the compressor phase current threshold I is set to: i is Limit of -a, the compressor phase current threshold II is set to: i is Limit for -b, the compressor phase current threshold III is set to: i is Limit of -c, wherein I Limit for The current value of the phase current limit frequency point of the compressor is a, b and c are constants, a<b<c。
According to an embodiment of the present invention, preferably, d is 10 ℃, e is 20 ℃, a is 1A, b is 2A, and c is 3A, and the predetermined time ranges from 30 seconds to 45 seconds, wherein the values of d, e, a, b, c and the predetermined time may be determined according to actual needs of the air conditioner operation.
The invention provides a low-temperature refrigeration control device of a variable frequency air conditioner, which comprises a memory and a processor; the memory is used for storing a computer program; the processor is configured to implement the above-mentioned method when executing the computer program.
A third aspect of the invention provides an air conditioner employing the method as described above, or comprising the apparatus as described above.
By adopting the low-temperature refrigeration control scheme of the variable-frequency air conditioner, the problem that the inner side heat exchanger is frosted in the low-temperature refrigeration operation process can be avoided; the problem that the shutdown is protected due to the fact that the gear rotating speed of the external fan is reduced and the compressor is loaded due to intermittent shutdown is solved; the phenomenon that overload frequency reduction is frequently caused due to temperature fluctuation of the T outer pipe is avoided, and the refrigerating capacity is improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a low-temperature refrigeration control method of an inverter air conditioner according to an exemplary embodiment of the present invention.
Fig. 2 is a flowchart illustrating an implementation of a low-temperature refrigeration control method of an inverter air conditioner according to an exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
As used herein, the words "first," "second," and the like may be used to describe elements in exemplary embodiments of the invention. These terms are only used to distinguish one element from another element, and the inherent features or order of the corresponding elements and the like are not limited by the terms. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms, such as those defined in commonly used dictionaries, are to be interpreted as having a meaning that is consistent with their context in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Those skilled in the art will understand that the devices and methods of the present invention described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments and that the scope of the present invention is defined solely by the claims. Features illustrated or described in connection with one exemplary embodiment may be combined with features of other embodiments. Such modifications and variations are intended to be included within the scope of the present invention.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, a detailed description of related known functions or configurations is omitted to avoid unnecessarily obscuring the technical points of the present invention. In addition, the same reference numerals refer to the same circuits, modules or units throughout the description, and repeated descriptions of the same circuits, modules or units are omitted for brevity.
Further, it should be understood that one or more of the following methods or aspects thereof may be performed by at least one control unit or controller. The terms "control unit," "controller," "control module," or "master control module" may refer to a hardware device that includes a memory or a computer-readable storage medium configured to store program instructions and a processor specifically configured to execute the program instructions to perform one or more processes that will be described further below. Moreover, it is to be appreciated that the following methods may be performed by including a processor in conjunction with one or more other components, as will be appreciated by one of ordinary skill in the art.
The air conditioner has the advantages that the change of the rotating speed of the outer fan can cause the change of the temperature of the outer pipe and the change of the load of the whole machine in the refrigeration mode, wherein the change of the load of the whole machine is mainly reflected by the change of the phase current of the compressor, in addition, the high temperature of the outer pipe can reflect the load of the whole machine from the side surface in the refrigeration mode, but the outdoor fan is controlled most directly from the two characteristics of the temperature of the outer pipe and the phase current of the compressor.
The low-temperature refrigeration control method and the device can detect T Outer ring Determining the gear range of the running windshield of the outdoor fan by the windshield of the indoor fan; real-time detection of phase current and T of compressor Outer tube When compressor phase current sum T Outer tube When any one of the air conditioner reaches a set threshold value, the rotating speed of the outer fan is controlled, and therefore low-temperature refrigeration control of the air conditioner is achieved.
The air-conditioning outdoor environment temperature sensing package is arranged behind the outdoor heat exchanger and used for sensing the outdoor environment; the outer pipe temperature sensing bulb is used for sensing the temperature of the coil pipe of the outdoor heat exchanger; the outer fan is arranged right in front of the outdoor heat exchanger and used for accelerating heat exchange; the compressor is the key component of the air conditioner, usually right below the exhaust and suction pipes.
Fig. 1 is a flowchart illustrating a low-temperature refrigeration control method of an inverter air conditioner according to an exemplary embodiment of the present invention. As shown in figure 1 of the drawings, in which,
at step S1, when the air conditioner enters the outdoor fan control mode of low temperature cooling, the outdoor side coil temperature T is acquired Outer tube Outdoor ambient temperature T Outer ring The gear for operating the indoor fan and the phase current of the compressor;
at step S2, according to T Outer ring Determining the gear range of the outdoor fan according to the gear of the indoor fan;
at step S3, according to the T Outer tube Determining and adjusting the running gear of the outdoor fan according to the phase current of the compressor and the gear range of the outdoor fan;
according to one or more embodiments of the present invention, a bulb of an air conditioner acquires an outdoor ambient temperature T Outer ring When the air conditioner is in the cooling mode and the compressor is in the operating state, when T Outer ring <T1(T1 is the entering temperature of the air conditioner low temperature refrigeration motor control), and the low temperature refrigeration external fan control is entered when the time period delta T is continuously detected. When T is Outer ring >And (4) when the temperature is T2(T2 is the exit temperature of the air conditioner low-temperature refrigeration motor control, for example, T2 is 18 ℃), the low-temperature refrigeration external fan control is exited. According to one or more embodiments of the invention, the delta T takes a value of 60s-90s, and the entering temperature of the T low-temperature refrigeration motor is controlled to be less than or equal to 16 ℃.
According to one or more embodiments of the invention, the air conditioner temperature sensing bulb obtains the outdoor environment temperature T Outer ring And determining the gear range of the operation of the external fan during low-temperature refrigeration according to the outdoor environment temperature range and the gear of the indoor fan. For example, the windshield and T of an indoor fan Outer ring The interval can be further divided into more intervals, the lowest gear rotating speed of the outdoor fan is 0r/s, the maximum gear rotating speed is set according to a motor specification and a drive debugging result, and the gear K of the outdoor fan is between the maximum gear 15 and the minimum gear 0.
According to one or more embodiments of the invention, the maximum rotation speed Rmax and the minimum rotation speed Rmin are set according to the specification of the air conditioner motor and the drive debugging result, and if the outdoor fan is divided into N gears, the K gear is K (Rmax-Rmin)/N + Rmin. For example, when N is 15 steps, the maximum Rmax is 800r/s, Rmin is 200r/s, and the rotation speed of the motor is 10 × (800-.
According to one or more embodiments of the present invention, T is preset according to an air conditioner Outer ring The temperature range of the indoor fan, the wind level of the indoor fan and the mapping table of the wind level of the outdoor fan are used for determining the gear range of the outdoor fan. As shown in the following table, the following,
according to one or more embodiments of the invention, in the low-temperature refrigeration control, when the indoor unit is set to be a mute wind shield, the heat exchange of the indoor evaporator is slow, the load is light, and the wind shield of the outdoor unit can be set to be lower;
in the low-temperature refrigeration control, when the inner machine is set to be a low windshield, the heat exchange of the indoor evaporator is faster than that of the indoor evaporator when the indoor evaporator is set to be a silent windshield, and the windshield of the outdoor machine can be set to be slightly higher than that of the outdoor machine when the indoor evaporator is set to be the silent windshield;
similarly, in the low-temperature refrigeration control, when the inner machine is set as a middle windshield, the heat exchange of the indoor evaporator is fast, and the windshield of the outdoor machine can be set higher to ensure the refrigeration capacity;
by analogy, when the wind shield is high indoors and ultrahigh, the gear of the outdoor fan can be set to be higher.
Fig. 2 is a flowchart illustrating an implementation of a low-temperature refrigeration control method of an inverter air conditioner according to an exemplary embodiment of the present invention. As shown in figure 2 of the drawings, in which,
when the air conditioner is in refrigeration operation, judging whether to enter a low-temperature refrigeration control mode, and if so, acquiring the temperature T of the outdoor side coil Outer tube Outdoor ambient temperature T Outer ring The operating gear of the indoor fan and the phase current of the compressor according to T Outer ring And the gear range of the outdoor fan is determined by the gear of the indoor fan.
As shown in fig. 2, the outer tube temperature control is not limited by the time interval of the preset time Y seconds, but the compressor phase current control has the time interval of the preset time Y seconds, so the priority is higher, therefore, the outer tube control can be executed on the control logic first, if the outer tube control does not meet the condition and then is controlled according to the phase current, and thus, the overload frequency reduction rate and the reliability problem caused by the overload of the whole machine can be avoided.
As shown in fig. 2, the temperature of the outer pipe is obtained, and the operation state of the outdoor fan is preferentially controlled as follows:
when T is Outer tube T for not less than full-speed running of outdoor fan Outer tube When the temperature is in the threshold value A, the outdoor fan is forced to operate at the highest gear;
when the outdoor fan operates at low speed, the threshold value B of the temperature of the outer pipe is less than or equal to T Outer tube < T at full speed operation of outdoor Fan Outer tube When the temperature is at the threshold value A and the indoor fan is in a stop state, the outdoor fan is forced to operate at a low gear (such as 6 gears).
According to one or more embodiments of the invention, wherein T is Outer tube The threshold value a of the temperature is set as: t is Limit of D, said T Outer tube The threshold B of the temperature is set as: t is Limit of -e, wherein T Limit of The temperature of the temperature limit frequency point of the outer tube, d and e are constants, wherein e>d, wherein T Limit of The temperature can be selected from 55 deg.C, d 10 deg.C, e 20 deg.C.
According to one or more embodiments of the invention, for example, if the temperature of the outer tube reaches T Limit of When the temperature is 55 ℃, the load of the whole machine is heavy in the refrigeration mode, and the temperature is T Limit of And d is 10 ℃ subtracted on the basis of 55 ℃, namely when the temperature of the outer pipe is 44 ℃, the gear of the outdoor fan is adjusted to the highest gear in advance, the load of the whole system is reduced, and the reliability of the system is ensured.
According to one or more embodiments of the invention, a line current in the operation of the compressor is obtained through a compressor current sampling circuit, and an effective value of the phase current of the compressor is calculated through a driving algorithm. In the running process of the compressor, the phase current of the compressor is detected at regular intervals and is used for controlling the gear of the outdoor fan.
As shown in fig. 2, the flow of controlling the gear of the outdoor fan according to the phase current of the compressor includes:
when the phase current of the compressor is not less than the phase current threshold I when the outdoor fan runs at full speed, the outdoor fan runs at the highest gear;
when the phase current threshold value II of the compressor is less than or equal to the phase current threshold value I of the compressor when the outdoor fan runs at full speed, the outdoor fan is increased by 1 gear to run on the basis of the current gear every preset time Y (the value range is 30-45 seconds) until the highest gear of the gear range is reached;
when the phase current threshold III of the compressor is less than or equal to the phase current threshold II of the compressor, the outdoor fan maintains the current running gear;
and when the phase current of the compressor is less than the phase current threshold III of the compressor, reducing the 1-gear operation of the outdoor fan on the basis of the current gear every preset time Y until the lowest gear of the gear range is reached.
According to one or more embodiments of the invention, the compressor phase current threshold I is set to: i is Limit of -a, the compressor phase current threshold II is set to: i is Limit of -b, the compressor phase current threshold III is set to: i is Limit for -c, wherein I Limit for The current values of the phase current limit frequency points of the compressor are constant values a, b and c. Wherein, a<b<c, phase current threshold I>Phase current threshold II>Phase current threshold III. For example, phase current limiting point I of compressor Limit of At 6.5A, phase current threshold I may be set to 5.5A, phase current threshold II may be set to 4.5A, phase current threshold II may be set to 3.5A, a is 1A, b is 2A, c is 3A, and predetermined time Y ranges from 30 seconds to 45 seconds. The phase current threshold values I, II, III are generally set according to the phase current limit frequency points of the compressors, and the phase current limit frequency points of different compressors may be different.
The invention also provides a low-temperature refrigeration control device of the variable frequency air conditioner, which comprises a memory and a processor; the memory is used for storing a computer program; the processor is used for realizing the air conditioner low-temperature refrigeration control method when the computer program is executed.
The invention also provides an air conditioner which adopts the air conditioner low-temperature refrigeration control method or comprises the air conditioner low-temperature refrigeration control device.
In accordance with one or more embodiments of the present invention, a control device (control logic, master control system, or control module) of the present invention may include one or more processors and may also include a non-transitory computer-readable medium therein. In particular, the master control system or control module may comprise a microcontroller MCU, and the master control chip or processor may be such as, but not limited to, one or more single-core or multi-core processors. The processor(s) may include any combination of general-purpose processors and special-purpose processors (e.g., graphics processors, application processors, etc.). The processor may be coupled thereto and/or may include a memory/storage device and may be configured to execute instructions stored in the memory/storage device to implement various applications and/or operating systems running on the controller in accordance with the present invention.
The drawings referred to above and the detailed description of the invention, which are exemplary of the invention, serve to explain the invention without limiting the meaning or scope of the invention as described in the claims. Accordingly, modifications may be readily made by those skilled in the art from the foregoing description. In addition, one skilled in the art may delete some of the constituent elements described herein without deteriorating performance, or may add other constituent elements to improve performance. Further, the order of the steps of the methods described herein may be varied by one skilled in the art depending on the environment of the process or apparatus. Therefore, the scope of the present invention should be determined not by the embodiments described above but by the claims and their equivalents.
While the invention has been described in connection with what is presently considered to be practical embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A low-temperature refrigeration control method of an inverter air conditioner comprises the following steps:
s1: when the air conditioner enters into the outdoor fan control mode of low-temperature refrigerationThen, the temperature T of the coil pipe outside the room is obtained Outer tube Outdoor ambient temperature T Outer ring The running gear of the indoor fan and the phase current of the compressor;
s2: according to T Outer ring Determining the gear range of the outdoor fan according to the gear of the indoor fan;
s3: according to the T Outer tube Determining and adjusting the running gear of the outdoor fan according to the phase current of the compressor and the gear range of the outdoor fan;
wherein in step S3, according to the T Outer tube The priority for determining and adjusting the operation gear of the outdoor fan is higher than the priority for determining and adjusting the outdoor fan according to the phase current of the compressor.
2. The method as claimed in claim 1, wherein, before the step S1, when the air conditioner is in the modulated cooling mode and the compressor is in an operation state, if the outdoor ambient temperature is continuously detected to be less than a preset temperature for a preset time period, it is determined that the air conditioner enters the outdoor fan control mode of low temperature cooling.
3. The method according to claim 2, wherein the preset temperature is the control inlet temperature of the air-conditioning low-temperature refrigeration motor, the value of the preset temperature is less than or equal to 16 ℃, and the value of the preset time period ranges from 60 seconds to 90 seconds.
4. The method of claim 1, the step S2 further comprising: according to the T of the air conditioner Outer ring The range of the gears of the outdoor fan is determined by a mapping table of the temperature range of the indoor fan, the wind gear of the indoor fan and the maximum and minimum wind gears allowed by the outdoor fan.
5. The method according to claim 1, in said step S3,
when T is Outer tube T for not less than full-speed running of outdoor fan Outer tube When the temperature is in the threshold value A, the outdoor fan is forced to operate at the highest gear;
when outdoor fanThe threshold value B of the temperature of the outer pipe during low-speed operation is less than or equal to T Outer tube < T at full speed operation of outdoor Fan Outer tube And when the temperature is at the threshold A and the indoor fan is in a stop state, the outdoor fan is forced to operate at a low gear.
6. The method according to claim 1, in said step S3,
when the phase current of the compressor is larger than or equal to the phase current threshold I when the outdoor fan runs at full speed, the outdoor fan runs at the highest gear;
when the phase current threshold value II of the compressor is not more than the phase current threshold value I of the compressor when the outdoor fan runs at full speed, the outdoor fan is increased by 1 gear to run on the basis of the current gear every preset time until the highest gear of the gear range is reached;
when the phase current threshold III of the compressor is less than or equal to the phase current threshold II of the compressor, the outdoor fan maintains the current running gear;
and when the phase current of the compressor is less than the phase current threshold III of the compressor, reducing the 1-gear operation of the outdoor fan on the basis of the current gear every preset time until the lowest gear of the gear range is reached.
7. The method of claim 5, wherein the T is Outer tube The threshold value a of the temperature is set as: t is Limit of D, said T Outer tube The threshold B of the temperature is set as: t is Limit of -e, wherein T Limit of The temperature of the temperature limit frequency point of the outer tube, d and e are constants, wherein e>d。
8. The method of claim 6, wherein the compressor phase current threshold I is set to: i is Limit of -a, the compressor phase current threshold II is set to: i is Limit of -b, the compressor phase current threshold III is set to: i is Limit of -c, wherein I Limit of The current value of the phase current limit frequency point of the compressor is a, b and c are constants, wherein a<b<c。
9. A low-temperature refrigeration control device of a variable frequency air conditioner comprises a memory and a processor;
the memory is used for storing a computer program;
the processor is used for realizing the low-temperature refrigeration control method of the inverter air conditioner according to any one of claims 1-8 when executing the computer program.
10. An air conditioner employing the low-temperature refrigeration control method of an inverter air conditioner according to any one of claims 1 to 8 or comprising the low-temperature refrigeration control device of an inverter air conditioner according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111154315.8A CN113864975B (en) | 2021-09-29 | 2021-09-29 | Low-temperature refrigeration control method and device of variable frequency air conditioner and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111154315.8A CN113864975B (en) | 2021-09-29 | 2021-09-29 | Low-temperature refrigeration control method and device of variable frequency air conditioner and air conditioner |
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