CN113483480A - Frequency control method for variable frequency air conditioner and air conditioner - Google Patents
Frequency control method for variable frequency air conditioner and air conditioner Download PDFInfo
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- CN113483480A CN113483480A CN202110772307.3A CN202110772307A CN113483480A CN 113483480 A CN113483480 A CN 113483480A CN 202110772307 A CN202110772307 A CN 202110772307A CN 113483480 A CN113483480 A CN 113483480A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a frequency control method of a variable frequency air conditioner and the air conditioner, comprising the following steps: after the air conditioner is started, adjusting the frequency of the air conditioner according to the refrigeration upper limit frequency and the environment temperature at the outdoor unit; adjusting the target superheat degree according to the frequency variation trend of the air conditioner in a stable refrigeration running state after the compressor runs for T1 time; and adjusting the frequency of the air conditioner according to the target superheat degree. In the technical scheme provided by the application, the target superheat degree is adjusted according to the frequency change trend of the air conditioner in the refrigeration stable operation state, then the frequency of the air conditioner is adjusted according to the corrected target superheat degree, so that the room temperature which tends to be stable can be continuously changed, and the set temperature is finally reached.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a frequency control method of a variable frequency air conditioner and the air conditioner.
Background
At present, the frequency of the variable frequency air conditioner is adjusted and controlled through a target superheat degree, and the target superheat degree is a fixed and unchangeable control value, so when the air conditioner reaches a stable state, an operation frequency area is stable, large change does not occur any more, small fluctuation exists in a small range, the refrigerating capacity of the air conditioner does not change, the indoor temperature does not change any more, and the comfort of a user is influenced if the indoor temperature does not reach a set temperature.
Disclosure of Invention
The invention solves the problems that when the air conditioner reaches a stable operation state, the frequency area is stable, no large change occurs, the corresponding refrigerating capacity is not changed, the indoor temperature is not changed, and the comfort of a user is influenced if the indoor temperature does not reach the set temperature.
In order to solve the above problems, the present invention provides a frequency control method for a variable frequency air conditioner, comprising:
after the air conditioner is started, adjusting the frequency of the air conditioner according to the refrigeration upper limit frequency and the environment temperature at the outdoor unit;
adjusting the target superheat degree according to the frequency variation trend of the air conditioner in a stable refrigeration running state after the compressor runs for T1 time;
and adjusting the frequency of the air conditioner according to the target superheat degree.
In the embodiment, the target superheat degree is adjusted through the frequency change trend of the air conditioner in a stable refrigeration running state, then the running frequency of the air conditioner is adjusted through the new target superheat degree, so that the frequency which tends to be stable is continuously changed, the room temperature is adjusted, and finally the room temperature reaches the set temperature.
In an alternative embodiment, the refrigeration steady operation state is a state where the target superheat degree and the air conditioner inner pipe temperature are close and last for T2 time.
In this embodiment, when the air conditioner enters the cooling steady operation state, the frequency tends to be stable, and the indoor temperature does not change any more.
In an alternative embodiment, the target superheat degree and the air conditioner inner pipe temperature are close to each other, which means that the absolute value of the difference between the target superheat degree and the air conditioner inner pipe temperature is not greater than 1 ℃.
In this embodiment, the absolute value of the difference between the target superheat degree and the temperature of the air conditioner inner pipe is not greater than 1 ℃, which means that the target superheat degree and the temperature of the air conditioner inner pipe are very close to each other, and the air conditioner enters a refrigeration stable operation state at this time, so that the frequency tends to be stable and does not change greatly any more.
In an alternative embodiment, the T1 and T2 are 5 min.
In the embodiment, the compressor enters a target superheat degree closed-loop control stage after running for 5min, and in the stage, the target superheat degree can be adjusted according to the frequency variation trend of the air conditioner in a stable refrigeration running state; meanwhile, in order to accurately know the frequency of the air conditioner in a stable refrigerating running state, the state that the absolute value of the difference value between the target superheat degree and the temperature of the inner pipe of the air conditioner is not more than 1 ℃ needs to last for 5 min.
In an alternative embodiment, the adjusting the target superheat degree according to the frequency variation tendency of the air conditioner in the cooling steady operation state includes:
if Fn is less than Fn-1-k, the target superheat degree is increased;
if Fn-1-k is not less than Fn and not more than Fn-1+ k, the target superheat degree is unchanged;
if Fn is larger than Fn-1+ k, adjusting the target superheat degree to be small;
wherein Fn is the frequency of the air conditioner in the current refrigeration stable operation state, Fn-1 is the frequency of the air conditioner in the last refrigeration stable operation state, Fn and Fn-1 are in the same target superheat degree, and k is the frequency variation.
In the present embodiment, the target superheat degree is adjusted differently according to different frequency variation tendencies of the air conditioner in the cooling steady operation state.
In an alternative embodiment, the target superheat is adjusted up or down by a change of 2 ℃.
In this embodiment, the adjustment variation of 2 ℃ is just suitable enough to meet the requirement of making the room temperature reach the set temperature in most cases.
In an alternative embodiment, the interval time T3 between two adjacent refrigerating stable operation states is more than or equal to 20 min.
In the embodiment, the interval time between two adjacent refrigerating stable operation states is set to be T3 being more than or equal to 20min, so that the frequency variation trend of the obtained air conditioner in the refrigerating stable operation state is more accurate, and the target superheat degree is accurately adjusted.
In an alternative embodiment, adjusting the frequency of the air conditioner according to the target superheat degree includes:
acquiring a difference value between the adjusted target superheat degree and the temperature of an inner pipe of the air conditioner;
and acquiring the next frequency of the air conditioner according to the difference, the last frequency of the air conditioner and the current frequency of the air conditioner, and updating the frequency of the air conditioner once every 30S.
In this embodiment, when the target superheat degree is changed, the cooling stable operation state of the air conditioner is broken, the operation frequency of the air conditioner is continuously changed, and the room temperature also reaches the set temperature.
In addition, the invention also provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the processor and runs to realize the frequency control method of the variable frequency air conditioner.
The air conditioner adopting the frequency control method of the variable frequency air conditioner does not have the problem that the indoor temperature does not reach the set temperature when the air conditioner reaches the stable operation state in the working process, and the use requirement of a user is met.
In addition, the invention also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and executed by a processor, the frequency control method of the variable frequency air conditioner is realized.
In the technical scheme provided by the application, the target superheat degree is adjusted according to the frequency change trend of the air conditioner in the refrigeration stable operation state, then the frequency of the air conditioner is adjusted according to the corrected target superheat degree, so that the room temperature which tends to be stable can be continuously changed, and the set temperature is finally reached.
Drawings
FIG. 1 is a flowchart illustrating a frequency control method for an inverter air conditioner according to an embodiment of the present disclosure;
fig. 2 is a logic block diagram of a frequency control method of an inverter air conditioner in an embodiment of the present application.
Detailed Description
At present, in the prior art, the frequency of a variable frequency air conditioner is adjusted and controlled based on a target superheat degree, the target superheat degree is usually a fixed value, once the air conditioner based on the target superheat degree reaches a stable operation state, the frequency is not continuously adjusted, but is maintained to fluctuate within a small range, at this time, the refrigerating capacity of the air conditioner is hardly changed, if no other factors influence, the room temperature is usually not reduced, but if the temperature set by a user is lower than the room temperature when the air conditioner reaches the stable state, the room temperature is not adjusted to the temperature set by the user due to the fact that the room temperature is not reduced, the use of the user is influenced, and the refrigerating requirement of the user cannot be met.
Based on the above reasons, the embodiment of the application provides a frequency control method for a variable frequency air conditioner, which can adjust the target superheat degree of the air conditioner if the room temperature does not drop to the temperature set by the user when the operating frequency of the air conditioner tends to be stable, so that the frequency tending to be stable can be continuously changed, that is, the operating frequency of the air conditioner can be continuously increased, the refrigerating capacity can be further increased, the room temperature can be continuously dropped, the temperature set by the user is finally reached, the use requirements of the user are fully met, and the practicability is good.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart illustrating a frequency control method of an inverter air conditioner according to an embodiment of the present application, which includes:
and S100, adjusting the frequency of the air conditioner according to the upper limit frequency of refrigeration and the ambient temperature of the outdoor unit after the air conditioner is started.
In this embodiment, since the operating frequency of the air conditioner is not stable immediately after the air conditioner is started, the target superheat degree of the air conditioner cannot be adjusted temporarily, at this time, the operating frequency of the air conditioner in the initial stage of starting in the cooling mode is in a state of continuous adjustment and variation, the magnitude of the frequency value is equal to the product of the upper cooling limit frequency of the air conditioner and a cooling outer loop correction coefficient, the cooling outer loop correction coefficient is related to the ambient temperature at the outdoor unit, the ambient temperature at the outdoor unit is different, and the corresponding cooling outer loop correction coefficient is also different.
And step S200, after the compressor is operated for T1 time, adjusting the target superheat degree according to the frequency variation trend of the air conditioner in the stable refrigeration operation state.
Generally, after the air conditioner starts a refrigeration mode, the room temperature will drop, after time T1 (T1 is usually not less than 5min), the operating frequency of the air conditioner will tend to be stable, the frequency does not change greatly any more, but fluctuates within a small range, and the corresponding room temperature is not changed, at this moment, the air conditioner can enter a target superheat degree closed-loop control stage, and the target superheat degree of the air conditioner can be adjusted at the stage, so that the stable frequency is changed again, and the purpose of continuously adjusting the room temperature is further achieved.
In this embodiment, the target superheat degree is adjusted according to a variation trend that the operating frequency of the air conditioner fluctuates within a small range, specifically, it is noted that the operating frequency of the air conditioner during the last refrigerating stable operation in the process that the operating frequency of the air conditioner fluctuates within the small range is Fn-1, the operating frequency of the air conditioner during the current refrigerating stable operation is Fn, and if Fn is less than Fn-1-k, the target superheat degree is adjusted to be high;
if Fn-1-k is not less than Fn and not more than Fn-1+ k, the current target superheat degree is not changed;
if Fn is larger than Fn-1+ k, the current target superheat degree is adjusted to be small;
the method is characterized in that k is a frequency variation, the value is usually 4Hz, Fn and Fn-1 are the frequencies of the air conditioner during the stable refrigeration operation under the current target superheat degree, the stable refrigeration operation means that the current target superheat degree is close to the temperature of an inner tube of the air conditioner, the close state lasts for T2 time, T2 is usually not lower than 5min, in addition, the interval time T3 between two adjacent stable refrigeration operations is not less than 20min, the purpose of design is to enable the obtained Fn and Fn-1 to be more accurate, then the variation trend of the fluctuation of the operation frequency of the air conditioner in a small range is accurately judged, the purpose of accurately adjusting the target superheat degree is finally achieved, and the room temperature can reach the temperature set by a user.
And step S300, adjusting the frequency of the air conditioner according to the target superheat degree.
In this embodiment, after the target superheat degree is changed, the original stability approaching state of the operation frequency of the air conditioner is broken, the operation frequency of the air conditioner is continuously adjusted, and finally the room temperature reaches the set temperature of the user, so that the use requirement of the user is met.
In this embodiment, the specific steps of adjusting the frequency of the air conditioner according to the target superheat degree include:
1. acquiring a difference value between the adjusted target superheat degree and the temperature of an inner pipe of the air conditioner;
2. and acquiring the next frequency of the air conditioner according to the difference, the last frequency of the air conditioner and the current frequency of the air conditioner.
In addition, fig. 2 shows a logic block diagram of the inverter air conditioner frequency control method in an embodiment of the present application, and the inverter air conditioner frequency control method in the embodiment can be understood with reference to fig. 2. In this embodiment, at the initial stage of starting up, the initial value of the target superheat degree is 10 ℃, the operation frequency F of the air conditioner in the cooling mode is F cooling upper limit B cooling outer loop correction coefficient, and the relationship between the B cooling outer loop correction coefficient and the ambient temperature at the outdoor unit is shown in the following table:
in the embodiment, the values of B1-B5 are (0,1), and the upper limit of F refrigeration is (80, 90).
In this embodiment, the air conditioner starts to operate for 5 minutes, and then enters a target superheat degree closed-loop control stage, in this stage, the variation of the target superheat degree which is adjusted up or down once is 2 ℃, the current target superheat degree and the temperature of the air conditioner inner tube in the refrigeration stable operation state are close to each other, that is, the absolute value of the difference between the target superheat degree and the temperature of the air conditioner inner tube is not more than 1 ℃, and the duration is 5 minutes, and in addition, the value range of the corrected target superheat degree is [ 6, 13 ].
In this embodiment, the difference Δ T between the corrected target superheat degree and the air conditioner inner tube temperature is ttarget superheat degree-tteation tube temperature, and the following frequency of the air conditioner obtained according to the difference, the previous frequency of the air conditioner and the current frequency of the air conditioner is calculated by the following formula:
f, calculating the target frequency for the next time, namely F, calculating the target frequency + F current target frequency at the last time, and delta F; the relationship between Δ F and Δ T is shown in the following table:
in this embodiment, the target frequency calculation update period of F is 30S, and as can be seen from the above table, when the target superheat degree is corrected, Δ F will not be 0%, so that the next time F calculates the target frequency, the room temperature is changed, and finally the room temperature reaches the temperature set by the user.
In addition, an embodiment of the present application further provides an air conditioner, which includes a computer-readable storage medium storing a computer program and a processor, where the computer program is read by the processor and executed to implement the frequency control method for the inverter air conditioner provided in the embodiment of the present application.
The air conditioner adopting the frequency control method of the variable frequency air conditioner does not have the problem that the indoor temperature does not reach the set temperature when the air conditioner reaches the stable state in the working process, and the use requirement of a user is met.
In addition, an embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the method for controlling the frequency of the inverter air conditioner provided in the embodiment of the present application is implemented.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A frequency control method of a variable frequency air conditioner is characterized by comprising the following steps:
after the air conditioner is started, adjusting the frequency of the air conditioner according to the refrigeration upper limit frequency and the environment temperature at the outdoor unit;
adjusting the target superheat degree according to the frequency variation trend of the air conditioner in a stable refrigeration running state after the compressor runs for T1 time;
and adjusting the frequency of the air conditioner according to the target superheat degree.
2. The frequency control method of the inverter air conditioner according to claim 1, wherein the cooling steady operation state is a state where the target superheat degree and the temperature of the air conditioner inner pipe are close and last for T2 time.
3. The frequency control method of the inverter air conditioner according to claim 2, wherein the target superheat degree and the air conditioner inner tube temperature are close to each other, that is, the absolute value of the difference between the target superheat degree and the air conditioner inner tube temperature is not more than 1 ℃.
4. The frequency control method of inverter air conditioner according to claim 2, wherein the T1 and T2 are 5 min.
5. The frequency control method of the inverter air conditioner according to claim 1, wherein the adjusting the target degree of superheat according to the trend of the frequency variation of the air conditioner in the cooling steady operation state comprises:
if Fn is less than Fn-1-k, the target superheat degree is increased;
if Fn-1-k is not less than Fn and not more than Fn-1+ k, the target superheat degree is unchanged;
if Fn is larger than Fn-1+ k, adjusting the target superheat degree to be small;
wherein Fn is the frequency of the air conditioner in the current refrigeration stable operation state, Fn-1 is the frequency of the air conditioner in the last refrigeration stable operation state, Fn and Fn-1 are in the same target superheat degree, and k is the frequency variation.
6. The frequency control method of an inverter air conditioner according to claim 5, wherein the target superheat degree is turned up or down by a variation of 2 ℃.
7. The frequency control method of the inverter air conditioner as claimed in claim 5, wherein the interval time T3 between two adjacent stable operation states of refrigeration is more than or equal to 20 min.
8. The inverter air conditioner frequency control method of claim 1, wherein adjusting the frequency of the air conditioner according to the target superheat degree comprises:
acquiring a difference value between the adjusted target superheat degree and the temperature of an inner pipe of the air conditioner;
and acquiring the next frequency of the air conditioner according to the difference, the last frequency of the air conditioner and the current frequency of the air conditioner, and updating the frequency of the air conditioner once every 30S.
9. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method according to any one of claims 1 to 8.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-8.
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Effective date of registration: 20230414 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant after: NINGBO AUX ELECTRIC Co.,Ltd. Address before: 519000 202, floor 2, building B, high tech Zone headquarters base, No. 2 Qianwan Second Road, Tangjiawan Town, high tech Zone, Zhuhai, Guangdong Applicant before: ZHUHAI TUOXIN TECHNOLOGY Co.,Ltd. Applicant before: NINGBO AUX ELECTRIC Co.,Ltd. |
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Application publication date: 20211008 |