CN109855251B - Exhaust superheat correction method and device for air conditioner, computer product and air conditioner - Google Patents

Exhaust superheat correction method and device for air conditioner, computer product and air conditioner Download PDF

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Publication number
CN109855251B
CN109855251B CN201910105298.5A CN201910105298A CN109855251B CN 109855251 B CN109855251 B CN 109855251B CN 201910105298 A CN201910105298 A CN 201910105298A CN 109855251 B CN109855251 B CN 109855251B
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air conditioner
exhaust superheat
exhaust
detection value
correction
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CN109855251A (en
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秦鸿亮
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Hisense Shandong Air Conditioning Co Ltd
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Hisense Shandong Air Conditioning Co Ltd
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Abstract

The invention provides an exhaust superheat correction method and device of an air conditioner, a computer product and the air conditioner, relates to the technical field of air conditioners and aims to solve the problems of high overall power and high reliability risk of the air conditioner caused by high exhaust superheat detection value. The correction method comprises the following steps: acquiring the running frequency of a compressor and the exhaust superheat detection value of an air conditioner in real time; judging whether the air conditioner meets all entry conditions of the exhaust superheat degree detection value correction process, wherein the entry conditions comprise: the difference value obtained by subtracting the set value of the exhaust superheat degree from the detection value of the exhaust superheat degree is greater than or equal to a preset difference value; the operating frequency is greater than or equal to a first preset operating frequency; if yes, entering a correction process to perform reduction correction; and if not, acquiring the running frequency of the compressor and the exhaust superheat detection value of the air conditioner at the next moment. The correction method is applied to correction of the exhaust superheat detection value of the air conditioner.

Description

Exhaust superheat correction method and device for air conditioner, computer product and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an exhaust superheat degree correction method and device of an air conditioner, a computer product and the air conditioner.
Background
In an air conditioner, an exhaust temperature sensor is usually arranged within 15 cm from the exhaust end of a compressor of the air conditioner so as to monitor the body temperature of the compressor.
The Discharge Superheat (DSH) of an air conditioner is an important parameter for controlling the opening degree of an expansion valve of the air conditioner. When the exhaust superheat degree of the air conditioner is increased, the opening degree of an expansion valve of the air conditioner is increased so as to increase the refrigerant circulation amount. The detection value of the exhaust superheat degree is generally equal to the detection value of the exhaust temperature minus the high-pressure saturation temperature of the refrigerant, wherein the detection value of the exhaust temperature sensor is generally taken as the detection value of the exhaust temperature, that is, the detection value of the exhaust temperature is substantially equal to the body temperature of the compressor.
However, as the air conditioner operates, the compressor generates heat due to the power-on operation, and the heat is accumulated, so that the temperature of the compressor body is higher than the actual temperature of the gaseous refrigerant discharged by the compressor (i.e. the true value of the discharge temperature), and the temperature value detected by the discharge temperature sensor is higher than the true value of the discharge temperature, thereby causing the detection value of the discharge superheat degree to be higher than the true value of the discharge superheat degree. Particularly, when the running frequency of the compressor is high, the heat of the compressor is serious, the heat accumulation of the compressor body is intensified, and the degree that the detection value of the exhaust superheat degree is higher than the true value of the exhaust superheat degree is large. This may cause the opening degree of the expansion valve to be larger than the actually required opening degree of the expansion valve, which results in the refrigerant circulation amount to be larger than the actually required refrigerant circulation amount, and the work of the compressor to be larger than the actually required work, which increases the load of the compressor while increasing the energy consumption, and causes the overall power and reliability risk of the air conditioner to increase.
Furthermore, the increase of the refrigerant circulation volume can also reduce the exhaust temperature detection value of the air conditioner, so that the exhaust frequency limit of the compressor is cancelled, the running frequency of the compressor is increased, the conditions of large opening degree of an expansion valve, high frequency of the compressor and even full-frequency running of the compressor occur in the air conditioner, the overall power of the air conditioner is increased, and the reliability risk of the air conditioner is also improved.
Disclosure of Invention
In view of the above problems in the prior art, embodiments of the present invention provide an exhaust superheat correction method and apparatus for an air conditioner, a computer product, and an air conditioner, so as to solve the problems of high overall power and high reliability risk of the air conditioner caused by a high exhaust superheat detection value.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for correcting an exhaust superheat degree of an air conditioner, including: and acquiring the running frequency of a compressor of the air conditioner and the exhaust superheat detection value of the air conditioner in real time. Judging whether the air conditioner meets all entry conditions of the exhaust superheat degree detection value correction process, wherein the entry conditions comprise: the difference value obtained by subtracting the set value of the exhaust superheat degree from the detection value of the exhaust superheat degree is greater than or equal to a preset difference value; the operating frequency is greater than or equal to a first preset operating frequency. If so, entering a correction process of the exhaust superheat degree detection value, and performing reduction correction on the exhaust superheat degree detection value to enable the exhaust superheat degree detection value to be close to an exhaust superheat degree true value of the air conditioner; and if not, acquiring the operating frequency of the compressor and the exhaust superheat detection value of the air conditioner at the next moment.
The exhaust superheat correction method of the air conditioner has the following beneficial effects:
in the running process of the air conditioner, the difference value of the running frequency of the compressor and the difference value of the exhaust superheat degree detection value minus the exhaust superheat degree set value is obtained to judge whether the exhaust superheat degree detection value needs to be corrected. When the difference value obtained by subtracting the set value of the exhaust superheat degree from the detected value of the exhaust superheat degree is larger than or equal to the preset difference value, the deviation degree of the detected value of the exhaust superheat degree relative to the set value of the exhaust superheat degree is large, and the opening degree of the expansion valve needs to be increased. When the operating frequency of the compressor is greater than or equal to the first preset operating frequency, the compressor is in a high-frequency operation state, the heat accumulation of the compressor is serious, the degree that the exhaust superheat degree detection value is slightly higher than the actual exhaust superheat degree is large, at the moment, if the expansion valve opening degree is increased according to the exhaust superheat degree detection value, the expansion valve opening degree is larger than the actually required expansion valve opening degree, the fact that the exhaust superheat degree detection value needs to be reduced and corrected can be reduced and close to the actual exhaust superheat degree, the situation that the expansion valve opening degree is larger than the actually required expansion valve opening degree due to the fact that the exhaust superheat degree detection value is slightly higher is avoided, therefore, the deviation between the refrigerant circulation quantity of the air conditioner and the actually required refrigerant circulation quantity is reduced, the increase of the whole power of the air conditioner cannot be caused, and the operation reliability of the air conditioner.
Optionally, the process for correcting the exhaust superheat detection value includes: calculating an exhaust superheat correction quantity according to the X-k multiplied by f; wherein X represents the exhaust superheat correction amount; f represents the current operating frequency of the compressor; k represents an exhaust superheat correction coefficient, and the value range of the exhaust superheat correction coefficient isAnd subtracting the calculated exhaust superheat correction quantity from the exhaust superheat detection value to obtain a corrected exhaust superheat detection value.
Optionally, the exhaust superheat correction coefficient is
Optionally, the exhaust superheat degree correction method further includes obtaining at least one of the following three information in real time: the exhaust temperature detection value, the suction superheat degree and the air conditioner working mode information of the air conditioner; the entry condition further includes at least one of: the exhaust temperature detection value is greater than or equal to a first preset temperature; the suction superheat degree is less than or equal to a first preset suction superheat degree; the air conditioner is currently in a heating mode.
Optionally, after the exhaust superheat degree is corrected, the method further includes: judging whether the air conditioner meets at least one exit condition of the exhaust superheat degree detection value correction process, wherein the exit condition comprises the following steps: the operating frequency is less than a second preset operating frequency; the exhaust temperature detection value is smaller than a second preset temperature; the suction superheat degree is greater than a second preset suction superheat degree; the air conditioner is in a non-heating operation mode. If so, exiting the correction process of the exhaust superheat degree detection value; if not, continuing to reduce and correct the exhaust superheat detection value. The second preset operation frequency is less than or equal to the first preset operation frequency, the second preset temperature is less than or equal to the first preset temperature, and the second preset suction superheat degree is greater than or equal to the first preset suction superheat degree.
Optionally, the first preset operating frequency is greater than or equal to 50Hz, the first preset temperature is greater than or equal to 80 ℃, and the first preset suction superheat degree is less than or equal to 2 ℃.
Optionally, the first preset operating frequency is 65Hz, and the second preset operating frequency is 62 Hz; the first preset temperature is 85 ℃, and the second preset temperature is 83 ℃; the first preset suction superheat degree is 2 ℃, and the second preset suction superheat degree is 4 ℃.
Optionally, the step of judging whether the air conditioner meets all entry conditions of the exhaust superheat detection value correction process is performed when the operating frequency of the compressor fluctuates within a preset fluctuation range.
In a second aspect, an embodiment of the present invention provides an exhaust superheat correction device of an air conditioner, including: the acquisition module is configured to acquire the operating frequency of a compressor of the air conditioner and the exhaust superheat detection value of the air conditioner in real time. The judging module connected with the obtaining module is configured to judge whether the air conditioner meets all entry conditions of the exhaust superheat degree detection value correction process, and the entry conditions comprise: the operating frequency is greater than or equal to a first preset operating frequency; and the difference value obtained by subtracting the set value of the exhaust superheat degree from the detected value of the exhaust superheat degree is greater than or equal to a preset difference value. And the processing module is connected with the judging module and is configured to control the air conditioner to enter the exhaust superheat detection value correcting process when the judging module judges that the air conditioner meets all entering conditions of the exhaust superheat detection value correcting process, and reduce and correct the exhaust superheat detection value to enable the exhaust superheat detection value to be close to the real exhaust superheat value of the air conditioner.
The beneficial effects that the exhaust superheat correction device of the air conditioner can produce are the same as the beneficial effects of the exhaust superheat correction method of the air conditioner provided by the first aspect, and the description is omitted here.
In a third aspect, embodiments of the invention provide a computer product comprising one or more processors configured to execute computer instructions to perform one or more steps of the exhaust superheat correction method as provided in the first aspect.
The beneficial effects that the computer product can produce are the same as the beneficial effects of the method for correcting the exhaust superheat degree of the air conditioner provided by the first aspect, and the description is omitted here.
In a fourth aspect, an embodiment of the present invention provides an air conditioner characterized by including the exhaust superheat correction device as provided in the second aspect.
The beneficial effects that the air conditioner can produce are the same as the beneficial effects of the exhaust superheat correction device of the air conditioner provided by the second aspect, and the description is omitted here.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described 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 of an exhaust superheat correction method for an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an exhaust superheat correction device of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
10-an acquisition module; 20-a judging module; 30-processing module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an exhaust superheat correction method for an air conditioner, including the following steps:
s1, acquiring the running frequency of a compressor of the air conditioner and the exhaust superheat detection value of the air conditioner in real time.
And S2, judging whether the air conditioner meets all entry conditions of the exhaust superheat degree detection value correction process. Wherein the entry conditions include:
a. the difference value obtained by subtracting the set value of the exhaust superheat degree from the detection value of the exhaust superheat degree of the air conditioner is greater than or equal to the preset difference value;
b. the operating frequency of a compressor of the air conditioner is greater than or equal to a first preset operating frequency.
If so, entering an exhaust superheat detection value correction process, and reducing and correcting the exhaust superheat detection value to enable the exhaust superheat detection value to be close to the actual exhaust superheat value of the air conditioner.
And if not, acquiring the operating frequency of the compressor and the exhaust superheat detection value of the air conditioner at the next moment.
In the entry condition a, the "set value of the degree of superheat of exhaust gas" refers to a reference value of the degree of superheat of exhaust gas set before shipment of the air conditioner, and may be set according to the condition of the refrigeration system of the air conditioner and the operation condition of the compressor itself. For example, the conditions of the refrigeration system may include the size of the evaporator and condenser of the air conditioner, the operating conditions, and the like.
The 'preset difference value' refers to the difference value of the exhaust superheat degree detection value minus the exhaust superheat degree set value allowed by the air conditioner, and can be set according to the condition of the compressor.
When the difference value obtained by subtracting the set value of the exhaust superheat degree from the detected value of the exhaust superheat degree is smaller than the preset difference value, the detected value of the exhaust superheat degree is close to the set value of the exhaust superheat degree and is in the allowable range of the compressor; when the difference value obtained by subtracting the set value of the exhaust superheat degree from the detected value of the exhaust superheat degree is greater than or equal to the preset difference value, the deviation degree between the detected value of the exhaust superheat degree and the set value of the exhaust superheat degree is large, and the opening degree of the expansion valve is increased.
As an example, the above-mentioned preset difference may be greater than or equal to 12 ℃.
In the above entry condition b, the "first preset operation frequency" is a boundary value between the high-frequency operation and the non-high-frequency operation of the operation frequency of the compressor, that is, when the operation frequency of the compressor is less than the first preset operation frequency, the compressor is not in the high-frequency operation state; when the operation frequency of the compressor is greater than or equal to the first preset operation frequency, the compressor is in a high-frequency operation state, at the moment, the heat of the compressor is serious, the heat accumulation of a compressor body is aggravated, the temperature of the compressor body is high, the degree that the exhaust temperature detection value is higher than the actual exhaust temperature value is large, and the degree that the exhaust superheat detection value is higher than the actual exhaust superheat value is large.
It should be noted that the first preset operating frequency is set flexibly, and can be set according to the condition of the refrigeration system of the air conditioner and the condition of the compressor itself. For example, the compressor itself includes parameters such as the type, brand and rated power of the compressor, for example, the variation range of the operating frequency is certain for a specific type of compressor, so that the critical values of high frequency and non-high frequency (i.e. the first preset operating frequency) can be roughly determined. As another example, the conditions of the refrigeration system may include the sizing of the evaporator, condenser, operating conditions, etc. of the air conditioner.
As an example, the first preset operating frequency may range from greater than or equal to 50Hz, and further, the first preset operating frequency may be 65 Hz.
When the air conditioner simultaneously meets the entry conditions a and b, the degree that the exhaust superheat degree detection value is higher than the actual exhaust superheat degree value is shown to be larger, at the moment, if the expansion valve opening degree is increased according to the exhaust superheat degree detection value, the expansion valve opening degree is larger than the actually required expansion valve opening degree, the fact that the exhaust superheat degree detection value needs to be reduced and corrected can be determined, the exhaust superheat degree detection value is reduced and is close to the actual exhaust superheat degree value, the situation that the expansion valve opening degree is larger than the actually required expansion valve opening degree due to the fact that the exhaust superheat degree detection value is higher is avoided, therefore, deviation between the refrigerant circulation quantity of the air conditioner and the actually required refrigerant circulation quantity is reduced, the whole power of the air conditioner cannot be increased, and the operation reliability of the air.
Based on the above technical solution, in some embodiments of the present invention, as an achievable way of performing the reduction correction on the exhaust superheat detection value in the above step S2, the exhaust superheat detection value correction process may include: first, the exhaust superheat correction amount is calculated from X — k × f. Wherein X represents exhaust superheat correction quantity, and the unit is; f represents the current operating frequency of the compressor in Hz; k represents the correction coefficient of the exhaust superheat degree in the unit of ℃/Hz, wherein the value range of the correction coefficient of the exhaust superheat degree can beFurther, the degree of superheat of the exhaust gasThe correction factor may beThen, the calculated exhaust superheat correction amount X is subtracted from the exhaust superheat detection value to obtain a corrected exhaust superheat detection value.
It should be noted that, since the change of the exhaust superheat detection value is mainly caused by the change of the compressor operating frequency, a relationship between the difference between the exhaust superheat detection value and the actual exhaust superheat value (i.e., the exhaust superheat correction amount X) and the compressor operating frequency f can be represented by a proportional function, and a proportional coefficient between the two is represented by an exhaust superheat correction coefficient k. The exhaust superheat correction coefficient k can be obtained by the following experiment:
the real values of the exhaust superheat degree of the air conditioner under different compressor operating frequencies f are measured respectively, in the measuring process, the temperature measuring device can be arranged on an exhaust pipeline connected with the compressor, and the temperature measuring device is far away from the exhaust end of the compressor, so that the measured temperature is not influenced by the temperature of the compressor. For example, the temperature measuring device may be spaced from the discharge end of the compressor by more than 15 cm.
And respectively acquiring the detection values of the exhaust temperature sensors of the air conditioner at different compressor operating frequencies f.
And (3) calculating the difference value of the detection value of the exhaust temperature sensor minus the true value of the exhaust superheat degree of the air conditioner under different compressor operating frequencies f to obtain a plurality of groups of (f,) data.
The k value can be obtained by fitting a plurality of sets of (f,) data to a function k × f.
And the difference value of the exhaust superheat detection value and the exhaust superheat real value actually represents the deviation degree of the exhaust superheat detection value and the exhaust superheat real value, so that the exhaust superheat correction quantity X can be considered to be equal to the difference value, and the coefficient between the exhaust superheat correction quantity X and the compressor operation frequency f can be determined to be k.
In some embodiments of the present invention, as an achievable manner, the exhaust superheat correction method may further include acquiring, in real time, at least one of the following three pieces of information: the air conditioner comprises an exhaust temperature detection value, an air suction superheat degree and air conditioner working mode information.
The entry condition of the exhaust superheat detection value correction process may further include at least one of the following three items:
c. the exhaust temperature detection value is greater than or equal to a first preset temperature;
d. the suction superheat degree is less than or equal to a first preset suction superheat degree;
e. the air conditioner is currently in a heating mode.
In the above entry condition c, "the first preset temperature" is a boundary value between a high temperature and a non-high temperature of the exhaust temperature detection value, that is, when the exhaust temperature detection value is smaller than the first preset temperature, the exhaust temperature detection value is in a non-high temperature range; when the exhaust temperature is greater than or equal to the first preset temperature, the exhaust temperature is in a high temperature range.
It should be noted that the first preset temperature is set flexibly and can be set according to the condition of the refrigeration system of the air conditioner and the condition of the compressor. For example, the compressor itself includes parameters such as the type, brand and rated power of the compressor, for example, the range of variation of the exhaust temperature detection value is certain for a specific type of compressor, so that the critical values of high temperature and non-high temperature (i.e. the first preset temperature) can be roughly determined. As another example, the conditions of the refrigeration system may include the sizing of the evaporator, condenser, operating conditions, etc. of the air conditioner.
As an example, the first preset temperature may be greater than or equal to 80 ℃, and further, the first preset temperature may be 85 ℃.
When the exhaust temperature detection value is greater than or equal to the first preset temperature, namely when the exhaust temperature detection value is in a high temperature range, the exhaust superheat detection value is caused to be high, so that the difference value of the exhaust superheat detection value minus the exhaust superheat setting value is large, namely the deviation degree between the exhaust superheat detection value and the exhaust superheat setting value is large.
Therefore, when the air conditioner meets the entry condition a of the exhaust superheat detection value correction process, if the air conditioner meets the entry condition c, the exhaust superheat detection value is further reduced and corrected when the deviation degree of the exhaust superheat detection value and the exhaust superheat setting value is large, so that the accuracy of judgment on whether the air conditioner needs to correct the exhaust superheat detection value is improved, and the accuracy of correction of the exhaust superheat detection value is improved.
In the above entry condition d, the suction superheat of the air conditioner is equal to the suction temperature of the air conditioner minus the low-pressure saturation temperature of the air conditioner (i.e., the evaporation temperature of the liquid refrigerant in the evaporator of the air conditioner).
The "first preset suction superheat" is a reference value of suction superheat set before the air conditioner leaves a factory, and can be set according to the condition of a refrigeration system of the air conditioner and the running condition of the compressor. For example, the conditions of the refrigeration system may include the size of the evaporator, the condenser, the operating conditions, etc. of the air conditioner.
As an example, the first preset suction superheat may be in a range of 2 ℃ or less, and further, the first preset suction superheat may be 2 ℃.
When the suction superheat degree is less than or equal to the first preset suction superheat degree, the suction superheat degree of the air conditioner is lower; and when the suction superheat degree is greater than the first preset suction superheat degree, the suction superheat degree of the air conditioner is higher.
The change of the suction superheat of the air conditioner is generally related to the change of the opening degree of an expansion valve of the air conditioner: when the opening degree of the expansion valve is larger than the actually required opening degree of the expansion valve, the flow of the refrigerant is increased, and the air suction temperature is lower due to insufficient heat exchange of the refrigerant and the air suction superheat degree is lower on the premise that the evaporation capacity of the evaporator is unchanged.
Therefore, when the air conditioner meets the entry condition b of the exhaust superheat degree detection value correction process, if the air conditioner meets the entry condition d, the exhaust superheat degree detection value of the air conditioner is further ensured to be reduced and corrected when the opening degree of the expansion valve is large, so that the accuracy of judging whether the exhaust superheat degree detection value of the high-altitude air conditioner needs to be corrected is improved, and the accuracy of correcting the exhaust superheat degree detection value of the air conditioner is further improved.
In the above entry condition d, the exhaust superheat degree of the air conditioner is calculated, the coil temperature of the condenser is usually used as the high-pressure saturation temperature of the refrigerant, and when the air conditioner is in the heating mode, the coil temperature of the condenser is usually in the supercooling section, that is, the coil temperature of the condenser is lower than the saturation temperature corresponding to the actual condensing pressure, so that the degree that the exhaust superheat degree detection value calculated from the coil temperature is slightly higher than the true value of the exhaust superheat degree is large.
Particularly, under the condition that all the indoor units are in a heating mode, the opening degree of the expansion valve corresponding to each indoor unit is larger than the actually required opening degree of the expansion valve due to the fact that the exhaust superheat detection value of each indoor unit is slightly higher than the actual exhaust superheat value, namely, the refrigerant circulation quantity of each indoor unit is larger than the actually required refrigerant circulation quantity, at the moment, the condition that the refrigerant circulation quantity of the whole air conditioner is larger than the actually required refrigerant circulation quantity is the most serious, and therefore after all the indoor units are in a heating mode, alarm shutdown of the air conditioner due to the fact that the air conditioner is overlarge in pressure caused by the fact that part of the indoor units are closed.
Therefore, when the air conditioner meets the entry condition a of the exhaust superheat detection value correction process, if the air conditioner meets the entry condition e, the exhaust superheat detection value of the air conditioner is further reduced and corrected when the deviation degree of the exhaust superheat detection value of the air conditioner and the exhaust superheat setting value is large, and therefore the accuracy of judgment on whether the exhaust superheat detection value of the high-altitude air conditioner needs to be corrected is improved, and the accuracy of correction of the exhaust superheat detection value of the air conditioner is improved.
In some embodiments of the present invention, as shown in fig. 1, the exhaust superheat degree correction method may further include the following steps after correcting the exhaust superheat degree:
and S3, judging whether the air conditioner meets at least one exit condition of the exhaust superheat degree detection value correction process. Wherein the exit condition includes:
f. the running frequency of the compressor is less than a second preset running frequency;
g. the exhaust temperature detection value is smaller than a second preset temperature;
h. the suction superheat degree is greater than a second preset suction superheat degree;
i. the air conditioner is in a non-heating operation mode.
And if so, exiting the correction process of the exhaust superheat detection value.
If not, continuing to reduce and correct the exhaust superheat detection value.
The second preset operation frequency is less than or equal to the first preset operation frequency, the second preset temperature is less than or equal to the first preset temperature, and the second preset suction superheat degree is greater than or equal to the first preset suction superheat degree. As an example, the first preset operating frequency is 65Hz, and the second preset operating frequency is 62 Hz; the first preset temperature is 85 ℃, and the second preset temperature is 83 ℃; the first preset suction superheat is 2 ℃, and the second preset suction superheat is 6 ℃.
In the exit condition f, the second preset operation frequency is less than or equal to the first preset operation frequency, the compressor is not in a high-frequency operation state, that is, the degree that the exhaust superheat degree detection value is slightly higher than the actual exhaust superheat degree value is small, the degree that the exhaust superheat degree detection value is slightly higher than the actual exhaust superheat degree value does not cause the increase of the opening of the expansion valve, and the air conditioner can exit the exhaust superheat degree detection value correction process. Furthermore, the second preset operation frequency can be smaller than the first preset operation frequency, so as to further ensure that the compressor is in a non-high-frequency operation state.
In the exit condition g, the second preset temperature is less than or equal to the first preset temperature, the exhaust temperature detection value is in a non-high temperature range, that is, the deviation degree of the exhaust superheat detection value from the exhaust superheat setting value is small, the degree that the exhaust superheat detection value is higher than the actual exhaust superheat value does not cause the increase of the opening of the expansion valve, and the air conditioner can exit the exhaust superheat detection value correction process. Furthermore, the second preset temperature can be lower than the first preset temperature, so that the exhaust temperature detection value is further ensured to be in a non-high temperature range.
In the exit condition h, the second preset suction superheat degree is greater than or equal to the first preset suction superheat degree, and the suction temperature of the air conditioner is higher. The air-conditioning suction temperature is related to the circulation amount of the refrigerant, and when the circulation amount of the refrigerant is small, the air-conditioning suction temperature is high, and the air-conditioning suction superheat degree should be reduced by increasing the circulation amount of the refrigerant. Therefore, when the air conditioner satisfies the exit condition h, the air conditioner does not need to correct the exhaust superheat detection value any more, and the air conditioner can exit the exhaust superheat detection value correction process.
In the exit condition i, the air conditioner is in a non-heating operation mode, an outdoor unit of the air conditioner serves as a condenser, the degree that a detection value of the exhaust superheat degree calculated by the temperature of a coil of the outdoor unit is slightly higher than a true value of the exhaust superheat degree is small, and the influence of the degree that the detection value of the exhaust superheat degree is slightly higher than the true value of the exhaust superheat degree on the opening degree of the expansion valve is reduced. Therefore, after the difference between the detected value of the exhaust superheat degree and the true value of the exhaust superheat degree is reduced in step S2, if the air conditioner satisfies the exit condition i, the air conditioner may exit the correction process of the detected value of the exhaust superheat degree.
In some embodiments of the present invention, as an implementation manner of the exhaust superheat correction method for an air conditioner, when the number of indoor units in which the air conditioner is turned on or operated changes, the step S2 of determining whether the air conditioner satisfies all entry conditions of the exhaust superheat detection value correction process may be performed when the operation frequency of the compressor fluctuates within a preset fluctuation range.
It should be noted that the "preset fluctuation range" refers to a smaller range in which the operating frequency of the compressor fluctuates. The above-mentioned "the operating frequency of the compressor fluctuates within a preset fluctuation range" means: the operating frequency of the compressor is in a relatively stable state, fluctuating only within a preset range.
When the air conditioner is started or the number of the running indoor units is changed, the change amplitude of the running frequency of the compressor is large, so that whether the air conditioner meets all entry conditions of the exhaust superheat degree detection value correction process can be judged after the running frequency of the compressor fluctuates within a preset fluctuation range, the running frequency of the compressor is in a relatively stable state at the moment, and the accuracy of judgment on all entry conditions of the air conditioner full exhaust superheat degree detection value correction process is improved.
For example, the step S2 may be performed after 15 minutes of turning on the air conditioner.
As another example, the step S2 may be performed after 15 minutes in which the number of operating indoor units is changed to change the operating frequency of the compressor by 10Hz or more.
Embodiments of the present invention also provide an exhaust superheat correction device of an air conditioner, which is capable of executing the above exhaust superheat correction method embodiment of the air conditioner, and the embodiment of the present invention may divide the exhaust superheat correction device into function modules according to the above method example, for example, each function module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiments of the present invention is schematic, and is only one division of logic functions, and there may be another division manner in actual implementation.
Fig. 2 shows a schematic diagram of a possible configuration of an apparatus capable of implementing the above-described method embodiment, with the functional modules being divided for the respective functions. As shown in fig. 2, in some embodiments of the present invention, the exhaust superheat correction apparatus of an air conditioner includes an acquisition module 10, a determination module 20, and a processing module 30, which are connected in sequence.
The obtaining module 10 is configured to obtain the operating frequency of the compressor of the air conditioner and the exhaust superheat detection value of the air conditioner in real time.
The judging module 20 is configured to judge whether the air conditioner satisfies all entry conditions of the exhaust superheat detection value correction process, and the entry conditions include: a. the operating frequency is greater than or equal to a first preset operating frequency; b. and the difference value obtained by subtracting the set value of the exhaust superheat degree from the detected value of the exhaust superheat degree is greater than or equal to a preset difference value.
The processing module 30 is configured to control the air conditioner to enter the exhaust superheat detection value correction process when the judging module 20 judges that the air conditioner satisfies all entry conditions of the exhaust superheat detection value correction process, and perform reduction correction on the exhaust superheat detection value so that the exhaust superheat detection value approaches to the true exhaust superheat value of the air conditioner.
In addition, all relevant contents of each step related to the method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
The exhaust superheat correction device of the air conditioner has the same advantages as the exhaust superheat correction method of the air conditioner, and the description is omitted here.
In some embodiments of the present invention, there is also provided a computer product comprising one or more processors configured to execute computer instructions to perform one or more steps of the exhaust superheat correction method of an air conditioner as described above. The computer product has the same advantages as the exhaust superheat correction method of the air conditioner, and the description is omitted here.
In some embodiments of the present invention, there is also provided an air conditioner including the exhaust superheat correction device of the air conditioner described above. The air conditioner has the same advantages as the exhaust superheat correction device of the air conditioner, and the description is omitted.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (11)

1. An exhaust superheat degree correction method of an air conditioner, characterized by comprising:
acquiring the running frequency of a compressor of the air conditioner and the exhaust superheat detection value of the air conditioner in real time;
judging whether the air conditioner meets all entry conditions of the exhaust superheat degree detection value correction process, wherein the entry conditions comprise: the difference value obtained by subtracting the set value of the exhaust superheat degree from the detection value of the exhaust superheat degree is greater than or equal to a preset difference value; the operating frequency is greater than or equal to a first preset operating frequency;
if so, entering a correction process of the exhaust superheat degree detection value, and performing reduction correction on the exhaust superheat degree detection value to enable the exhaust superheat degree detection value to be close to an exhaust superheat degree true value of the air conditioner;
and if not, acquiring the operating frequency of the compressor and the exhaust superheat detection value of the air conditioner at the next moment.
2. An exhaust superheat correction method of an air conditioner according to claim 1, wherein the exhaust superheat detection value correction process includes:
calculating an exhaust superheat correction quantity according to the X-k multiplied by f; wherein X represents the exhaust superheat correction amount and has a unit of; f represents the current operating frequency of the compressor in Hz; k represents an exhaust superheat correction coefficient, and the value range of the exhaust superheat correction coefficient is
And subtracting the calculated exhaust superheat correction quantity from the exhaust superheat detection value to obtain a corrected exhaust superheat detection value.
3. The exhaust superheat correction method of an air conditioner according to claim 2, wherein the exhaust superheat correction coefficient is
4. The exhaust superheat correction method of an air conditioner according to claim 1, further comprising acquiring in real time at least one of the following three pieces of information: the exhaust temperature detection value, the suction superheat degree and the air conditioner working mode information of the air conditioner;
the entry condition further includes at least one of: the exhaust temperature detection value is greater than or equal to a first preset temperature; the suction superheat degree is less than or equal to a first preset suction superheat degree; the air conditioner is currently in a heating mode.
5. The exhaust superheat correction method of an air conditioner according to claim 4, further comprising, after correcting the exhaust superheat: judging whether the air conditioner meets at least one exit condition of the exhaust superheat degree detection value correction process, wherein the exit condition comprises the following steps: the operating frequency is less than a second preset operating frequency; the exhaust temperature detection value is smaller than a second preset temperature; the suction superheat degree is greater than a second preset suction superheat degree; the air conditioner is in a non-heating working mode;
if so, exiting the correction process of the exhaust superheat degree detection value;
if not, continuing to reduce and correct the exhaust superheat detection value;
the second preset operation frequency is less than or equal to the first preset operation frequency, the second preset temperature is less than or equal to the first preset temperature, and the second preset suction superheat degree is greater than or equal to the first preset suction superheat degree.
6. An exhaust superheat correction method of an air conditioner according to claim 5, wherein the first preset operation frequency is 50Hz or more, the first preset temperature is 80 ℃ or more, and the first preset suction superheat is 2 ℃ or less.
7. An exhaust superheat correction method of an air conditioner according to claim 6, wherein the first preset operation frequency is 65Hz, and the second preset operation frequency is 62 Hz; the first preset temperature is 85 ℃, and the second preset temperature is 83 ℃; the first preset suction superheat degree is 2 ℃, and the second preset suction superheat degree is 4 ℃.
8. The exhaust superheat correction method of an air conditioner according to claim 1, wherein the step of determining whether the air conditioner satisfies all entry conditions of an exhaust superheat detection value correction process is performed after an operating frequency of the compressor fluctuates within a preset fluctuation range when the number of indoor units in which the air conditioner is turned on or operated changes.
9. An exhaust superheat correction device of an air conditioner, characterized by comprising:
the acquisition module is configured to acquire the operating frequency of a compressor of the air conditioner and the exhaust superheat detection value of the air conditioner in real time;
the judging module connected with the obtaining module is configured to judge whether the air conditioner meets all entry conditions of the exhaust superheat degree detection value correction process, and the entry conditions comprise: the operating frequency is greater than or equal to a first preset operating frequency; the difference value obtained by subtracting the set value of the exhaust superheat degree from the detection value of the exhaust superheat degree is greater than or equal to a preset difference value;
and the processing module is connected with the judging module and is configured to control the air conditioner to enter the exhaust superheat detection value correcting process when the judging module judges that the air conditioner meets all entering conditions of the exhaust superheat detection value correcting process, and reduce and correct the exhaust superheat detection value to enable the exhaust superheat detection value to be close to the real exhaust superheat value of the air conditioner.
10. A computer product comprising one or more processors configured to execute computer instructions to perform one or more steps of a method of correcting exhaust superheat of an air conditioner as claimed in any one of claims 1 to 8.
11. An air conditioner characterized by comprising the exhaust superheat correction device of the air conditioner as claimed in claim 9.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005207674A (en) * 2004-01-23 2005-08-04 Hitachi Ltd Ventilation air conditioning equipment of building
CN103363745A (en) * 2012-04-06 2013-10-23 上海微电子装备有限公司 Refrigerating device and temperature control method thereof
CN105371437A (en) * 2015-12-01 2016-03-02 青岛海尔空调器有限总公司 Air conditioner control method
CN105465962A (en) * 2015-12-25 2016-04-06 珠海格力电器股份有限公司 Control system, method and device for exhaust temperature of compressor
CN105987548A (en) * 2015-02-03 2016-10-05 Tcl空调器(中山)有限公司 Refrigerating system running status detection method and device
CN106524612A (en) * 2016-10-28 2017-03-22 珠海格力电器股份有限公司 Control system and method for preventing liquid impacts of air conditioner compressor and air conditioner system
CN107255349A (en) * 2017-06-26 2017-10-17 广东美的暖通设备有限公司 Sensor temperature modification method, device and computer-readable recording medium

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005207674A (en) * 2004-01-23 2005-08-04 Hitachi Ltd Ventilation air conditioning equipment of building
CN103363745A (en) * 2012-04-06 2013-10-23 上海微电子装备有限公司 Refrigerating device and temperature control method thereof
CN105987548A (en) * 2015-02-03 2016-10-05 Tcl空调器(中山)有限公司 Refrigerating system running status detection method and device
CN105371437A (en) * 2015-12-01 2016-03-02 青岛海尔空调器有限总公司 Air conditioner control method
CN105465962A (en) * 2015-12-25 2016-04-06 珠海格力电器股份有限公司 Control system, method and device for exhaust temperature of compressor
CN106524612A (en) * 2016-10-28 2017-03-22 珠海格力电器股份有限公司 Control system and method for preventing liquid impacts of air conditioner compressor and air conditioner system
CN107255349A (en) * 2017-06-26 2017-10-17 广东美的暖通设备有限公司 Sensor temperature modification method, device and computer-readable recording medium

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