CN108895629B - Frequency control method of variable frequency air conditioner and air conditioner - Google Patents
Frequency control method of variable frequency air conditioner and air conditioner Download PDFInfo
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- CN108895629B CN108895629B CN201810803101.0A CN201810803101A CN108895629B CN 108895629 B CN108895629 B CN 108895629B CN 201810803101 A CN201810803101 A CN 201810803101A CN 108895629 B CN108895629 B CN 108895629B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- 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
- F24F11/88—Electrical aspects, e.g. 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
- F24F2110/00—Control inputs relating to air properties
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Abstract
The invention provides a frequency control method of a variable frequency air conditioner and the air conditioner. The frequency control method of the variable frequency air conditioner comprises the following steps: acquiring ambient temperature information, actual evaporation temperature and compressor operation information of the air conditioner according to a preset time period; when the environmental temperature information does not exceed the specified temperature threshold, determining a third target evaporation temperature according to the compressor operation information, the first target evaporation temperature and the second target evaporation temperature so as to obtain an evaporation temperature difference by combining with the actual evaporation temperature; matching a corresponding target frequency correction proportion according to the obtained evaporation temperature difference; and generating a target operation frequency according to the current operation frequency of the compressor and the target frequency correction proportion so that the compressor can operate according to the target operation frequency. The reliability of the compressor and the air conditioner is improved, the frequency of the compressor of the air conditioner is prevented from being greatly changed in a short time, further, the fluctuation of the indoor temperature is prevented from being greatly increased, the comfort level of the air conditioner is improved, and the air conditioner is more energy-saving and environment-friendly.
Description
Technical Field
The invention relates to the technical field of frequency conversion, in particular to a frequency control method of a variable frequency air conditioner and the air conditioner.
Background
The compressor is the heart of the air-conditioning product, and the rotating speed of the compressor directly influences the use efficiency of the air conditioner. The inverter air conditioner controls and adjusts the rotating speed of the compressor according to the temperature of the environment by means of the inverter, so that the compressor is always in the optimal rotating speed state, and the energy efficiency ratio is improved.
Generally speaking, although the inverter air conditioner can save much energy consumption, the compressor frequency adjustment strategy adopted by the current inverter air conditioner has some problems. For example, in order to meet the requirement of rapid cooling, no matter how the external environment temperature is, as long as the inverter air conditioner detects that the difference exists between the environment temperature and the target temperature, the compressor is controlled to enter the highest frequency operation, so as to realize rapid cooling. However, under some normal temperature working conditions (the ambient temperature is 18-29 ℃), the compressor quickly reduces from high frequency to low frequency due to low ambient temperature. Thus, not only can the temperature fluctuation occur to influence the indoor comfort, but also the electricity is very wasted.
Disclosure of Invention
In view of the above, the present invention is directed to a method for controlling a frequency of an inverter air conditioner to improve the above problem.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a frequency control method of a variable frequency air conditioner is applied to the air conditioner and comprises the following steps: acquiring environment temperature information, actual evaporation temperature and compressor operation information of the air conditioner corresponding to the air conditioner according to a preset time period; when the environmental temperature information does not exceed a specified temperature threshold value, determining a third target evaporation temperature according to the compressor operation information, a preset first target evaporation temperature and a preset second target evaporation temperature; acquiring an evaporation temperature difference according to the third target evaporation temperature and the actual evaporation temperature; matching a target frequency correction proportion according to the obtained evaporation temperature difference; and generating a target operation frequency according to the current operation frequency of the compressor and the target frequency correction proportion so that the compressor can operate according to the target operation frequency.
Further, determining a third target evaporation temperature according to the compressor operation information, a preset second target evaporation temperature and a preset first target evaporation temperature includes: judging whether the compressor operation information meets a preset condition or not, wherein the compressor operation information comprises an operation time length, an oil return time length and an exhaust superheat degree, and the preset condition comprises that the operation time length does not exceed a first preset time length or the oil return time length does not exceed the first preset time length; if the compressor operation information meets the preset condition, taking the preset second target evaporation temperature as the determined third target evaporation temperature; and if the compressor operation information does not meet the preset condition, determining a third target evaporation temperature between the first target evaporation temperature and a second target evaporation temperature according to the exhaust superheat degree, wherein the first target evaporation temperature is less than the second target evaporation temperature.
Further, the determining a third target evaporation temperature between the first target evaporation temperature and the second target evaporation temperature according to the degree of superheat of the exhaust gas comprises: when the exhaust superheat degree is smaller than a first temperature value within a second continuous preset time, performing down-regulation according to a preset regulation value on the basis of the third target evaporation temperature corresponding to the adjacent previous time period to serve as the third target evaporation temperature corresponding to the current time period; when the exhaust superheat degree is larger than a second temperature value within a second continuous preset time, performing up-regulation according to a preset regulation value on the basis of the third target evaporation temperature corresponding to the adjacent previous time period to serve as the third target evaporation temperature corresponding to the current time period; wherein the second temperature value is greater than the first temperature value; and when the exhaust superheat degree is between the first temperature value and the second temperature value within a second continuous preset time period, taking the third target evaporation temperature corresponding to the previous adjacent time period as the third target evaporation temperature corresponding to the current time period.
Further, the manner of acquiring the actual evaporation temperature is as follows: respectively obtaining the average temperature of the inner disc, the average temperature of the thin tube, the average temperature of the thick tube and a preset refrigeration target evaporation temperature weighting coefficient; according to the average temperature of the inner disc, the average temperature of the thin tube, the average temperature of the thick tube and a preset weighting coefficient of the refrigeration target evaporation temperature, utilizing a formula:
Tpractice of＝(TInner disc+TThick pipe+TThin tube)/K,
Calculating the corresponding actual evaporation temperature, wherein TPractice ofRepresents the actual evaporation temperature, TInner discRepresents the average temperature of the inner disk, TThick pipeRepresents the average temperature, T, of the raw pipeThin tubeRepresents the mean temperature of the tubule.
Further, the air conditioner is internally pre-stored with a corresponding relationship between a plurality of actual evaporation temperature intervals and the frequency correction proportion, the actual evaporation temperature intervals are adjacent and continuous to each other, and the higher the temperature value of the actual evaporation temperature interval is, the smaller the corresponding frequency correction proportion is; the method for matching the target frequency correction proportion according to the obtained evaporation temperature difference comprises the following steps: searching the actual evaporation temperature interval matched with the actual evaporation temperature; and taking the frequency correction proportion corresponding to the found actual evaporation temperature interval as the target frequency correction proportion.
Further, the correspondence between the plurality of actual evaporation temperature intervals and the frequency correction ratio includes: when the actual evaporation temperature interval is less than-8 ℃, the corresponding frequency correction proportion is 10 percent; when the actual evaporation temperature interval is more than-8 ℃ and less than-5 ℃, the corresponding frequency correction proportion is 8%; when the actual evaporation temperature interval is more than-5 ℃ and less than-3 ℃, the corresponding frequency correction proportion is 5%; when the actual evaporation temperature interval is more than-3 ℃ and less than-1 ℃, the corresponding frequency correction proportion is 2%; when the actual evaporation temperature interval is more than-1 ℃ and less than 1 ℃, the corresponding frequency correction proportion is 0%; when the actual evaporation temperature interval is more than 1 ℃ and less than 3 ℃, the corresponding frequency correction proportion is-2%; when the actual evaporation temperature interval is more than 3 ℃ and less than 5 ℃, the corresponding frequency correction proportion is-5%; when the actual evaporation temperature interval is more than 5 ℃ and less than 8 ℃, the corresponding frequency correction proportion is-8%; when the actual evaporation temperature interval is more than 8 ℃, the corresponding frequency correction proportion is-10%.
Further, the generating of the target operating frequency according to the current operating frequency of the compressor and the target frequency correction ratio includes: acquiring the target operating frequency corresponding to the previous adjacent time period; according to the target operation frequency corresponding to the previous adjacent time period, the current operation frequency and the target frequency correction proportion corresponding to the time period, using a formula:
f1＝f2+f3×ΔF，
calculating the target operation frequency corresponding to the current time period, wherein f1Representing the target operating frequency, f, corresponding to the current time period2Representing said target operating frequency, f, corresponding to the immediately preceding said time period3Represents the operating frequency and Δ F represents the target frequency correction ratio.
Further, the frequency control method of the inverter air conditioner further comprises the following steps: when the ambient temperature information exceeds the specified temperature threshold, taking a difference between the first target evaporation temperature and the actual evaporation temperature as the evaporation temperature difference.
Compared with the prior art, the frequency control method of the variable frequency air conditioner has the following advantages:
according to the frequency control method of the variable frequency air conditioner, when the acquired environmental temperature information does not exceed the specified temperature threshold value, the third target evaporation temperature is determined according to the compressor operation information, the preset first target evaporation temperature and the preset second target evaporation temperature, so that the acquired target evaporation temperature is more consistent with the current actual condition of the air conditioner. And acquiring an evaporation temperature difference according to the third target evaporation temperature and the actual evaporation temperature, matching a corresponding target frequency correction proportion, generating a target operation frequency according to the current operation frequency of the compressor and the target frequency correction proportion, and controlling the compressor to operate according to the target operation frequency. The reliability of the compressor and the air conditioner is improved, the frequency of the compressor of the air conditioner is prevented from being greatly changed in a short time, further, the fluctuation of the indoor temperature is prevented from being greatly increased, the comfort level of the air conditioner is improved, and the air conditioner is more energy-saving and environment-friendly.
Another objective of the present invention is to provide an air conditioner to improve the above mentioned problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner, comprising: the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring environment temperature information, actual evaporation temperature and compressor operation information of the air conditioner corresponding to the air conditioner according to a preset time period; the determining module is used for determining a third target evaporation temperature according to the compressor operation information, a preset first target evaporation temperature and a preset second target evaporation temperature when the environment temperature information does not exceed a specified temperature threshold; the obtaining module is used for obtaining an evaporation temperature difference according to the third target evaporation temperature and the actual evaporation temperature; the matching module is used for matching a target frequency correction proportion according to the obtained evaporation temperature difference; and the frequency adjusting module is used for generating a target operation frequency according to the current operation frequency of the compressor and the target frequency correction proportion so as to facilitate the compressor to operate according to the target operation frequency.
Further, the determining module is specifically configured to: judging whether the compressor operation information meets a preset condition or not, wherein the compressor operation information comprises an operation time length, an oil return time length and an exhaust superheat degree, and the preset condition comprises that the operation time length does not exceed a first preset time length or the oil return time length does not exceed the first preset time length; if the compressor operation information meets the preset condition, taking the preset second target evaporation temperature as the determined third target evaporation temperature; and if the compressor operation information does not meet the preset condition, determining a third target evaporation temperature between the first target evaporation temperature and a second target evaporation temperature according to the exhaust superheat degree, wherein the first target evaporation temperature is less than the second target evaporation temperature.
Compared with the prior art, the air conditioner and the frequency control method of the variable frequency air conditioner have the same advantages, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flowchart illustrating steps of a frequency control method for an inverter air conditioner according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating sub-steps of step S103;
FIG. 3 is a flow chart of sub-steps of step S106;
fig. 4 is a schematic diagram of functional modules of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
the system comprises an air conditioner 1, an acquisition module 2, a determination module 3, an acquisition module 4, a matching module 5 and a frequency adjusting module 6.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In addition, the operation information of the compressor mentioned in the embodiment of the present invention refers to data representing the operation state of the compressor, which is collected after the compressor starts to operate. Alternatively, the compressor operation information may include, but is not limited to, an operation time period, an oil return time period, and a discharge superheat degree. The actual evaporation temperature mentioned in the embodiment of the present invention refers to the temperature information of the evaporator in the current time period. Optionally, the average temperature of the inner disc mentioned in the embodiment of the present invention refers to an average value between temperature values collected by a plurality of temperature collecting units disposed on the inner disc. The thin pipe mentioned in the embodiment of the present invention refers to a liquid pipe of an air conditioner, or also referred to as a high pressure pipe. The average temperature of the tubule mentioned in the embodiment of the present invention refers to an average value between temperature values collected by a plurality of temperature collecting units provided on the tubule of the evaporator. The thick pipe mentioned in the embodiments of the present invention refers to an air pipe of an air conditioner or is also called a low pressure pipe. The average temperature of the thick pipe mentioned in the embodiment of the present invention refers to an average value between temperature values collected by a plurality of temperature collecting units disposed on the thick pipe of the evaporator. The target operation frequency mentioned in the embodiment of the present invention means that the preferred operation frequency of the compressor in the current time period is calculated.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
First embodiment
Referring to fig. 1, an embodiment of the invention provides a frequency control method for a variable frequency air conditioner. The frequency control method of the inverter air conditioner can be applied to the air conditioner 1, for example, the inverter air conditioner 1. As shown in fig. 1, the method for controlling the frequency of the inverter air conditioner may include the following steps:
step S101, obtaining environment temperature information, actual evaporation temperature and compressor operation information of the air conditioner 1 corresponding to the air conditioner 1 according to a preset time period.
In the embodiment of the present invention, the preset temperature acquisition unit is used to respectively acquire the ambient temperature information, the temperatures of the plurality of inner disks, the temperatures of the plurality of thin pipes, and the temperatures of the plurality of thick pipes corresponding to the air conditioner 1 in each time period. The temperature collecting unit may be a temperature sensor, and specifically, the temperature collecting unit may collect environmental temperature information of an environment where the air conditioner 1 is currently located, by a temperature sensor installed in an outdoor unit of the air conditioner 1. A plurality of inner disc temperatures are collected through the temperature sensors arranged on the inner disc respectively, and it needs to be explained that a plurality of temperature sensors can be arranged on the inner disc, and each temperature sensor collects one inner disc temperature to ensure the collection precision. The temperature sensors mounted on the tubules of the evaporator are used for respectively collecting temperatures of the tubules, and it should be noted that the tubules of the evaporator can be provided with a plurality of temperature sensors, and each temperature sensor collects temperature of one tubule to ensure collection accuracy. The temperature sensors mounted on the thick pipes of the evaporator are used for respectively collecting temperatures of the thick pipes, and it should be noted that the thick pipes of the evaporator can be provided with a plurality of temperature sensors, and each temperature sensor collects the temperature of one thick pipe to ensure the collection precision. The period length of the time period is preferably 30 s.
Further, the actual evaporation temperature can be calculated according to the collected temperatures of the inner discs, the capillary tubes and the thick tubes. Optionally, the inner disc average temperature, the tubule average temperature, and the fat pipe average temperature are respectively obtained according to the inner disc temperatures, the tubule temperatures, and the fat pipe temperatures. For example, the average of the plurality of inner disk temperatures obtained in the time period is defined as an inner disk average temperature, the average of the plurality of tubule temperatures obtained in the time period is defined as a tubule average temperature, and the average of the plurality of thick tube temperatures obtained in the time period is defined as a thick tube average temperature. And then acquiring a preset refrigeration target evaporation temperature weighting coefficient from the air conditioning period. According to the average temperature of the inner disc, the average temperature of the thin tube, the average temperature of the thick tube and a preset weighting coefficient of the refrigeration target evaporation temperature, utilizing a formula:
Tpractice of＝(TInner disc+TThick pipe+TThin tube)/K,
Calculating the corresponding actual evaporation temperature, wherein TPractice ofRepresents the actual evaporation temperature, TInner discRepresents the average temperature of the inner disk, TThick pipeRepresents the average temperature, T, of the raw pipeThin tubeRepresents the mean temperature of the tubule.
Preferably, the above-mentioned refrigeration target evaporating temperature weighting coefficient may be 3.4.
Further, during this time period, the air conditioner 1 also acquires its operation information from the corresponding compressor. The operation state information of the compressor may include: the operation time, the oil return time and the exhaust superheat degree. The following steps: the operation time and the oil return time are both the operation time and the oil return time of the compressor from the start of the air conditioner 1 to the current time point. The exhaust superheat degree may be a difference between an exhaust temperature corresponding to the current time period of the air conditioner 1 and the outer tray temperature.
And step S102, when the environment temperature information exceeds the specified temperature threshold, taking the difference value between the first target evaporation temperature and the actual evaporation temperature as the evaporation temperature difference.
In the embodiment of the present invention, there is no necessary sequence between step S102 and step S103, and the two are in parallel. After obtaining the evaporation temperature difference by step S102, the flow directly proceeds to step S105. Alternatively, the specified temperature threshold may be set to any value between 18 ℃ and 29 ℃. Preferably, the specified temperature threshold may be set to 29 ℃. The first target evaporation temperature may be 10 ℃.
And step S103, when the environmental temperature information does not exceed a specified temperature threshold, determining a third target evaporation temperature according to the compressor operation information, a preset first target evaporation temperature and a preset second target evaporation temperature.
In the related art, when the ambient temperature information does not exceed the specified temperature threshold and the compressor is operated due to the detection of a difference between the indoor ambient temperature and the target temperature, the high frequency operation is first entered. At the same time, the temperature is not high (18-29 ℃), and the operation is switched to low frequency immediately. On the one hand, the sudden switching of the frequency of the air conditioner 1 causes large indoor temperature fluctuation and high energy consumption. On the other hand, at some special ambient temperatures (for example, the ambient temperature is lower than 18 ℃), the compressor is always limited to low-frequency operation, the compressor does little work, the exhaust superheat degree of the compressor is low, and the reliability of the compressor is affected.
In the embodiment of the present invention, in order to solve the above problem, when the ambient temperature information does not exceed the specified temperature threshold, a third target evaporation temperature is determined according to the compressor operation information, the preset first target evaporation temperature and the preset second target evaporation temperature, so that the determined target evaporation temperature meets the current requirement of the air conditioner 1. Specifically, as shown in fig. 2, the step S103 may include the following sub-steps:
and a substep S1031 of determining whether the compressor operation information satisfies a preset condition.
In the embodiment of the present invention, the preset conditions may be that the operation time length does not exceed a first preset time length and the oil return time length does not exceed the first preset time length. The mode satisfying the preset condition may be any one of the following modes: the running time length is not more than a first preset time length or the oil return time length is not more than the first preset time length.
And a substep S1032 of taking the preset second target evaporation temperature as the determined third target evaporation temperature if the compressor operation information satisfies the preset condition.
In the embodiment of the present invention, the second target evaporation temperature is a temperature value preset in the air conditioner 1. The second target evaporation temperature is greater than the first target evaporation temperature. Preferably, the second target evaporation temperature may be 13 ℃. And when the operation length in the compressor operation information does not exceed a first preset time length or the oil return time length does not exceed the first preset time length, taking the temperature value corresponding to the second target evaporation temperature as a third target evaporation temperature. Preferably, the first preset time period may be 5 min. That is, when the starting time of the compressor is not more than 5min or the oil return time period is not more than 5min, the second target evaporation temperature is directly used as the third target evaporation temperature. And after the third target evaporation temperature is determined, the flow proceeds to step S104.
And a substep S1033, determining a third target evaporation temperature between the first target evaporation temperature and a second target evaporation temperature according to the degree of superheat of the exhaust gas if the compressor operation information does not satisfy the preset condition, wherein the first target evaporation temperature is less than the second target evaporation temperature.
In the embodiment of the invention, when the exhaust superheat degree is smaller than the first temperature value within a second preset duration, the exhaust superheat degree is adjusted downwards according to a preset adjusting value on the basis of a third target evaporation temperature corresponding to an adjacent previous time period to serve as the third target evaporation temperature corresponding to the current time period. Preferably, the first temperature value may be 10 ℃, the second preset time period may be 10min, and the adjustment value may be 1. That is, based on the third target evaporation temperature and the adjustment value corresponding to the immediately previous time period, using the formula:
T1＝T2-Δ,
and acquiring a third target evaporation temperature corresponding to the current time period. Wherein, T1Representing a third target evaporation temperature, T, corresponding to the current time period2Representing the third target evaporating temperature for the immediately preceding time period, and delta representing the adjustment value.
In the embodiment of the invention, when the exhaust superheat degree is greater than a second temperature value within a second preset duration, the exhaust superheat degree is adjusted up according to a preset adjusting value on the basis of the third target evaporation temperature corresponding to the adjacent previous time period to serve as the third target evaporation temperature corresponding to the current time period; wherein the second temperature value is greater than the first temperature value. Preferably, the second temperature value may be 30 ℃. Specifically, based on the third target evaporation temperature and the adjustment value corresponding to the previous adjacent time period, using the formula:
T1＝T2+Δ,
and acquiring a third target evaporation temperature corresponding to the current time period. Wherein, T1Representing a third target evaporation temperature, T, corresponding to the current time period2Representing the third target evaporating temperature for the immediately preceding time period, and delta representing the adjustment value.
In the embodiment of the present invention, when the exhaust superheat degree is between the first temperature value and the second temperature value within a second preset duration, the third target evaporation temperature corresponding to the previous adjacent time period is taken as the third target evaporation temperature corresponding to the current time period.
And step S104, acquiring an evaporation temperature difference according to the third target evaporation temperature and the actual evaporation temperature.
In the embodiment of the present invention, the difference between the third target evaporation temperature and the actual evaporation temperature is taken as the evaporation temperature difference.
And step S105, matching a target frequency correction proportion according to the obtained evaporation temperature difference.
In the embodiment of the present invention, the air conditioner 1 stores in advance the correspondence between a plurality of actual evaporation temperature intervals and the frequency correction ratio. The implementation manner of the above step S105 may be: and firstly searching the actual evaporation temperature interval matched with the actual evaporation temperature. And then the frequency correction proportion corresponding to the found actual evaporation temperature interval is used as the target frequency correction proportion.
The plurality of divided actual evaporation temperature intervals are adjacent and continuous to each other, and the higher the temperature value of the actual evaporation temperature interval is, the smaller the corresponding frequency correction ratio is. Specifically, when the actual evaporation temperature interval is less than-8 ℃, the corresponding frequency correction proportion is 10%; when the actual evaporation temperature interval is more than-8 ℃ and less than-5 ℃, the corresponding frequency correction proportion is 8%; when the actual evaporation temperature interval is more than-5 ℃ and less than-3 ℃, the corresponding frequency correction proportion is 5%; when the actual evaporation temperature interval is more than-3 ℃ and less than-1 ℃, the corresponding frequency correction proportion is 2%; when the actual evaporation temperature interval is more than-1 ℃ and less than 1 ℃, the corresponding frequency correction proportion is 0%; when the actual evaporation temperature interval is more than 1 ℃ and less than 3 ℃, the corresponding frequency correction proportion is-2%; when the actual evaporation temperature interval is more than 3 ℃ and less than 5 ℃, the corresponding frequency correction proportion is-5%; when the actual evaporation temperature interval is more than 5 ℃ and less than 8 ℃, the corresponding frequency correction proportion is-8%; when the actual evaporation temperature interval is more than 8 ℃, the corresponding frequency correction proportion is-10%.
And step S106, generating a target operation frequency according to the current operation frequency of the compressor and the target frequency correction proportion so that the compressor can operate according to the target operation frequency.
In the embodiment of the present invention, the current operating frequency may be an actual operating frequency of the compressor 1 before the compressor frequency is adjusted in the current time period. As shown in fig. 3, the step S106 may include the following sub-steps:
and a substep S1061, obtaining a target operating frequency corresponding to the previous adjacent time period.
And a substep S1062, correcting the ratio according to the target operating frequency corresponding to the previous adjacent time period, the actual operating frequency of the current compressor, and the target frequency corresponding to the time period, by using a formula:
f1＝f2+f3×ΔF，
calculating the target operation frequency corresponding to the current time period, wherein f1Representing the current said purpose corresponding to the said time periodNominal operating frequency, f2Representing said target operating frequency, f, corresponding to the immediately preceding said time period3Represents the operating frequency and Δ F represents the target frequency correction ratio.
So that the compressor of the air conditioner 1 in the current time period is operated at the target operation frequency obtained in step S106. The air conditioner 1 is prevented from directly limiting the operation frequency to the low-frequency operation due to the excessively low ambient temperature information. The frequency adjustment of the compressor is more accurate, the running frequency of the air conditioner 1 is prevented from greatly fluctuating in a short time, the use experience of a user is ensured, and real energy conservation is realized.
Second embodiment
Referring to fig. 4, fig. 4 is a schematic diagram illustrating functional modules of an air conditioner 1 according to an embodiment of the present invention. As shown in fig. 4, the air conditioner 1 includes: the device comprises an acquisition module 2, a determination module 3, an acquisition module 4, a matching module 5 and a frequency adjustment module 6.
And the acquisition module 2 is used for acquiring the environment temperature information and the actual evaporation temperature corresponding to the air conditioner 1 and the compressor operation information of the air conditioner 1 according to a preset time period.
And the determining module 3 is configured to determine a third target evaporation temperature according to the compressor operation information, a preset first target evaporation temperature and a preset second target evaporation temperature when the environment temperature information does not exceed a specified temperature threshold.
Preferably, whether the compressor operation information meets a preset condition is judged, wherein the compressor operation information comprises an operation time length, an oil return time length and an exhaust superheat degree, and the preset condition comprises that the operation time length does not exceed a first preset time length or the oil return time length does not exceed the first preset time length. And if the compressor operation information meets the preset condition, taking the preset second target evaporation temperature as the determined third target evaporation temperature. And if the compressor operation information does not meet the preset condition, determining a third target evaporation temperature between the first target evaporation temperature and a second target evaporation temperature according to the exhaust superheat degree, wherein the first target evaporation temperature is less than the second target evaporation temperature.
And the obtaining module 4 is configured to obtain an evaporation temperature difference according to the third target evaporation temperature and the actual evaporation temperature.
And the matching module 5 is used for matching a target frequency correction proportion according to the obtained evaporation temperature difference.
And the frequency adjusting module 6 is used for generating a target operation frequency according to the current operation frequency of the compressor and the target frequency correction proportion so that the compressor can operate according to the target operation frequency.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the air conditioner 1 described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In summary, the embodiments of the present invention provide a frequency control method for an inverter air conditioner and an air conditioner. The frequency control method of the variable frequency air conditioner is applied to the air conditioner and comprises the following steps: acquiring environment temperature information, actual evaporation temperature and compressor operation information of the air conditioner corresponding to the air conditioner according to a preset time period; when the environmental temperature information does not exceed a specified temperature threshold value, determining a third target evaporation temperature according to the compressor operation information, a preset first target evaporation temperature and a preset second target evaporation temperature; acquiring an evaporation temperature difference according to the third target evaporation temperature and the actual evaporation temperature; matching a target frequency correction proportion according to the obtained evaporation temperature difference; and generating a target operation frequency according to the current operation frequency of the compressor and the target frequency correction proportion so that the compressor can operate according to the target operation frequency. The reliability of the compressor and the air conditioner is improved, the frequency of the compressor of the air conditioner is prevented from being greatly changed in a short time, further, the fluctuation of the indoor temperature is prevented from being greatly increased, the comfort level of the air conditioner is improved, and the air conditioner is more energy-saving and environment-friendly.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The frequency control method of the inverter air conditioner is applied to an air conditioner (1), and is characterized by comprising the following steps:
acquiring environment temperature information, actual evaporation temperature and compressor operation information corresponding to the air conditioner (1) according to a preset time period;
when the environment temperature information does not exceed a specified temperature threshold value, judging whether the compressor operation information meets a preset condition or not, wherein the compressor operation information comprises an operation time length, an oil return time length and an exhaust superheat degree, and the preset condition comprises that the operation time length does not exceed a first preset time length or the oil return time length does not exceed the first preset time length;
if the compressor operation information meets the preset condition, taking a preset second target evaporation temperature as a determined third target evaporation temperature;
if the compressor operation information does not meet the preset condition, determining a third target evaporation temperature between a preset first target evaporation temperature and a preset second target evaporation temperature according to the exhaust superheat degree, wherein the first target evaporation temperature is smaller than the second target evaporation temperature;
acquiring an evaporation temperature difference according to the third target evaporation temperature and the actual evaporation temperature;
matching a target frequency correction proportion according to the obtained evaporation temperature difference;
and generating a target operation frequency according to the current operation frequency of the compressor and the target frequency correction proportion so as to enable the compressor to operate according to the target operation frequency.
2. The frequency control method of inverter air conditioner according to claim 1, wherein said determining a third target evaporation temperature between the first target evaporation temperature and the second target evaporation temperature according to the degree of superheat of the exhaust gas comprises:
when the exhaust superheat degree is smaller than a first temperature value within a second continuous preset time, performing down-regulation according to a preset regulation value on the basis of the third target evaporation temperature corresponding to the adjacent previous time period to serve as the third target evaporation temperature corresponding to the current time period;
when the exhaust superheat degree is larger than a second temperature value within a second continuous preset time, performing up-regulation according to a preset regulation value on the basis of the third target evaporation temperature corresponding to the adjacent previous time period to serve as the third target evaporation temperature corresponding to the current time period; wherein the second temperature value is greater than the first temperature value;
and when the exhaust superheat degree is between the first temperature value and the second temperature value within a second continuous preset time period, taking the third target evaporation temperature corresponding to the previous adjacent time period as the third target evaporation temperature corresponding to the current time period.
3. The frequency control method of the inverter air conditioner according to any one of claims 1-2, wherein the actual evaporating temperature is obtained by:
respectively obtaining the average temperature of the inner disc, the average temperature of the thin tube, the average temperature of the thick tube and a preset refrigeration target evaporation temperature weighting coefficient;
according to the average temperature of the inner disc, the average temperature of the thin tube, the average temperature of the thick tube and a preset weighting coefficient of the refrigeration target evaporation temperature, utilizing a formula:
Tpractice of＝(TInner disc+TThick pipe+TThin tube)/K,
Calculating the corresponding actual evaporation temperature, wherein TPractice ofRepresents the actual evaporation temperature, TInner discRepresents the average temperature of the inner disk, TThick pipeRepresents the average temperature, T, of the raw pipeThin tubeRepresents the mean temperature of the tubule.
4. The frequency control method of inverter air conditioner according to claim 1, wherein the air conditioner (1) stores in advance the correspondence between a plurality of actual evaporation temperature intervals and the frequency correction ratio, the plurality of actual evaporation temperature intervals are adjacent and continuous to each other, and the higher the temperature value of the actual evaporation temperature interval is, the smaller the corresponding frequency correction ratio is; the method for matching the target frequency correction proportion according to the obtained evaporation temperature difference comprises the following steps:
searching the actual evaporation temperature interval matched with the actual evaporation temperature;
and taking the frequency correction proportion corresponding to the found actual evaporation temperature interval as the target frequency correction proportion.
5. The frequency control method of the inverter air conditioner according to claim 4, wherein the correspondence between the plurality of actual evaporation temperature intervals and the frequency correction ratio comprises:
when the actual evaporation temperature interval is less than-8 ℃, the corresponding frequency correction proportion is 10 percent; when the actual evaporation temperature interval is more than-8 ℃ and less than-5 ℃, the corresponding frequency correction proportion is 8%; when the actual evaporation temperature interval is more than-5 ℃ and less than-3 ℃, the corresponding frequency correction proportion is 5%; when the actual evaporation temperature interval is more than-3 ℃ and less than-1 ℃, the corresponding frequency correction proportion is 2%; when the actual evaporation temperature interval is more than-1 ℃ and less than 1 ℃, the corresponding frequency correction proportion is 0%; when the actual evaporation temperature interval is more than 1 ℃ and less than 3 ℃, the corresponding frequency correction proportion is-2%; when the actual evaporation temperature interval is more than 3 ℃ and less than 5 ℃, the corresponding frequency correction proportion is-5%; when the actual evaporation temperature interval is more than 5 ℃ and less than 8 ℃, the corresponding frequency correction proportion is-8%; when the actual evaporation temperature interval is more than 8 ℃, the corresponding frequency correction proportion is-10%.
6. The method for controlling the frequency of the inverter air conditioner according to claim 1, wherein the generating of the target operating frequency according to the current operating frequency of the compressor and the target frequency correction ratio comprises:
acquiring the target operating frequency corresponding to the previous adjacent time period;
according to the target operation frequency corresponding to the previous adjacent time period, the current operation frequency and the target frequency correction proportion corresponding to the time period, using a formula:
f1＝f2+f3×ΔF，
calculating the target operation frequency corresponding to the current time period, wherein f1Representing the target operating frequency, f, corresponding to the current time period2Representing said target operating frequency, f, corresponding to the immediately preceding said time period3Represents the operating frequency and Δ F represents the target frequency correction ratio.
7. The inverter air conditioner frequency control method according to claim 1, further comprising: when the ambient temperature information exceeds the specified temperature threshold, taking a difference between the first target evaporation temperature and the actual evaporation temperature as the evaporation temperature difference.
8. An air conditioner, characterized in that the air conditioner (1) comprises:
the system comprises an acquisition module (2) and a control module, wherein the acquisition module is used for acquiring environment temperature information and actual evaporation temperature corresponding to the air conditioner (1) and compressor operation information of the air conditioner (1) according to a preset time period;
the determining module (3) is used for determining a third target evaporation temperature according to the compressor operation information, a preset first target evaporation temperature and a preset second target evaporation temperature when the environment temperature information does not exceed a specified temperature threshold; wherein the determining module (3) is specifically configured to:
judging whether the compressor operation information meets a preset condition or not, wherein the compressor operation information comprises an operation time length, an oil return time length and an exhaust superheat degree, and the preset condition comprises that the operation time length does not exceed a first preset time length or the oil return time length does not exceed the first preset time length;
if the compressor operation information meets the preset condition, taking the preset second target evaporation temperature as the determined third target evaporation temperature;
if the compressor operation information does not meet the preset condition, determining a third target evaporation temperature between the first target evaporation temperature and a second target evaporation temperature according to the exhaust superheat degree, wherein the first target evaporation temperature is smaller than the second target evaporation temperature;
the obtaining module (4) is used for obtaining an evaporation temperature difference according to the third target evaporation temperature and the actual evaporation temperature;
the matching module (5) is used for matching a target frequency correction proportion according to the obtained evaporation temperature difference;
and the frequency adjusting module (6) is used for generating a target operation frequency according to the current operation frequency of the compressor and the target frequency correction proportion so as to facilitate the compressor to operate according to the target operation frequency.
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| CN110296515B (en) * | 2019-08-07 | 2021-04-02 | 宁波奥克斯电气股份有限公司 | Control method and device for improving comfort of air conditioner, air conditioner and storage medium |
| CN113446670A (en) * | 2020-03-26 | 2021-09-28 | 青岛海尔空调电子有限公司 | Method for controlling running frequency of compressor |
| CN111649439B (en) * | 2020-05-08 | 2021-12-31 | 宁波奥克斯电气股份有限公司 | Air conditioner control method |
| CN112060860B (en) * | 2020-09-28 | 2021-11-19 | 恒大恒驰新能源汽车研究院(上海)有限公司 | Temperature control method and device for vehicle air conditioning system and computer readable storage medium |
| CN112254312A (en) * | 2020-09-30 | 2021-01-22 | 青岛海尔空调器有限总公司 | Method and device for controlling air conditioner and air conditioner |
| CN115540245A (en) * | 2021-06-30 | 2022-12-30 | 美的集团股份有限公司 | Air conditioner refrigeration control method, air conditioner and computer readable storage medium |
| CN115654777B (en) * | 2022-11-09 | 2023-12-15 | 南京天加环境科技有限公司 | Defrosting control method and device and heat pump unit |
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