CN116772381A - Method and device for adjusting opening of electronic expansion valve of air conditioner - Google Patents
Method and device for adjusting opening of electronic expansion valve of air conditioner Download PDFInfo
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- CN116772381A CN116772381A CN202310749073.XA CN202310749073A CN116772381A CN 116772381 A CN116772381 A CN 116772381A CN 202310749073 A CN202310749073 A CN 202310749073A CN 116772381 A CN116772381 A CN 116772381A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000004891 communication Methods 0.000 claims description 11
- 238000013507 mapping Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 4
- 239000003507 refrigerant Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application relates to a method and a device for adjusting the opening of an electronic expansion valve of an air conditioner, wherein the method comprises the following steps: determining target air suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner; determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner; determining an adjusting variable of the electronic expansion valve according to the target air suction superheat degree and the actual air suction superheat degree; and controlling the electronic expansion valve to adjust the opening according to the adjusting variable. The application avoids the faults of the machine set.
Description
Technical Field
The application relates to the field of air conditioners, in particular to a method and a device for adjusting the opening of an electronic expansion valve of an air conditioner.
Background
At present, when the electronic expansion valve is adopted as a throttling device in the air conditioning industry, the electronic expansion valve is mainly adjusted by using the suction air temperature to fix the superheat degree, but the requirements on the use temperature range of the unit are wider along with the severe use environment of the unit, when the electronic expansion valve is adjusted by using the fixed suction air superheat degree, the unit is easy to fail, for example, the unit is easy to generate effusion under a low pressure difference working condition, the exhaust temperature is too high under a high pressure difference working condition, and the energy efficiency of the unit is low when the outer ring temperature is higher.
Aiming at the problem that the air conditioner is easy to fail during operation, no good solution exists at present.
Disclosure of Invention
The application provides a method and a device for adjusting the opening of an electronic expansion valve of an air conditioner, which are used for solving the problem that the air conditioner is easy to fail during operation.
In a first aspect, the present application provides a method for adjusting an opening degree of an electronic expansion valve of an air conditioner, where the method includes:
determining target air suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner;
determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner;
determining an adjusting variable of the electronic expansion valve according to the target air suction superheat degree and the actual air suction superheat degree;
and controlling the electronic expansion valve to adjust the opening according to the adjusting variable.
Further, the determining the target suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner includes:
after the air conditioner is electrified, determining the target opening of the electronic expansion valve according to the detected outer ring temperature and the detected inner ring temperature;
and after the electronic expansion valve is controlled to run for a preset time with the target opening, determining a target air suction superheat according to the target opening, the outer ring temperature, the inner ring temperature and the initial air suction superheat.
Further, the determining the target opening of the electronic expansion valve according to the detected outer ring temperature and inner ring temperature includes:
acquiring the outer ring temperature, the inner ring temperature, the initial opening of an electronic expansion valve, the outer ring temperature coefficient and the inner ring temperature coefficient of the air conditioner;
determining a first product value of the outer ring temperature coefficient and the outer ring temperature, and determining a second product value of the inner ring temperature coefficient and the inner ring temperature;
and adding the first product value on the basis of the initial opening, and subtracting the second product value to obtain the target opening of the electronic expansion valve.
Further, the determining the target suction superheat according to the target opening, the outer ring temperature, the inner ring temperature, and the initial suction superheat includes:
acquiring an outer ring adjusting coefficient of the electronic expansion valve, an inner ring adjusting coefficient of the electronic expansion valve and an initial inspiration superheat degree;
determining a third product value of the outer ring adjustment coefficient and the outer ring temperature, and determining a fourth product value of the inner ring adjustment coefficient and the inner ring temperature;
and subtracting the third product value from the initial suction superheat degree, and adding the fourth product value to obtain the target suction superheat degree.
Further, the determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner includes:
the method comprises the steps of periodically obtaining the air suction temperature of an air suction port of a compressor through an air suction temperature sensor, and periodically obtaining the air suction pressure of the air suction port of the compressor through an air suction pressure sensor;
determining an air suction saturation temperature corresponding to the air suction pressure according to a preset mapping table;
and taking the difference value between the suction air temperature and the suction air saturation temperature as the actual suction air superheat degree.
Further, the determining the adjustment variable of the electronic expansion valve according to the target suction superheat degree and the actual suction superheat degree includes:
acquiring a first actual suction superheat degree of a current period n and a second actual suction superheat degree of the period n-1;
determining a first difference between the target suction superheat and the first actual suction superheat and a second difference between the target suction superheat and the second actual suction superheat;
if the target difference value of the first difference value and the second difference value exceeds a preset range, a third difference value between the target suction superheat degree and a third actual suction superheat degree in a period n-2 is obtained;
and determining the adjusting variable of the electronic expansion valve according to the preset coefficient, the first difference value, the second difference value and the third difference value of the electronic expansion valve.
Further, after determining the first difference between the target suction superheat and the first actual suction superheat, the method includes:
and if the target difference value is within the preset range, determining that the adjusting variable is zero.
In a second aspect, there is provided an apparatus for adjusting an opening degree of an electronic expansion valve of an air conditioner, the apparatus comprising:
the first determining module is used for determining target suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner;
the second determining module is used for determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner;
the third determining module is used for determining the adjusting variable of the electronic expansion valve according to the target suction superheat degree and the actual suction superheat degree;
and the control module is used for controlling the electronic expansion valve to adjust the opening according to the adjusting variable.
In a third aspect, the present application provides an air conditioner with electronic expansion valve opening adjustment, including: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor coupled to the at least one bus; at least one memory coupled to the at least one bus, wherein the processor is configured to: the method for adjusting the opening of the electronic expansion valve of the air conditioner comprises the following steps:
determining target air suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner;
determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner;
determining an adjusting variable of the electronic expansion valve according to the target air suction superheat degree and the actual air suction superheat degree;
and controlling the electronic expansion valve to adjust the opening according to the adjusting variable.
Further, the determining the target suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner includes:
after the air conditioner is electrified, determining the target opening of the electronic expansion valve according to the detected outer ring temperature and the detected inner ring temperature;
and after the electronic expansion valve is controlled to run for a preset time with the target opening, determining a target air suction superheat according to the target opening, the outer ring temperature, the inner ring temperature and the initial air suction superheat.
Further, the determining the target opening of the electronic expansion valve according to the detected outer ring temperature and inner ring temperature includes:
acquiring the outer ring temperature, the inner ring temperature, the initial opening of an electronic expansion valve, the outer ring temperature coefficient and the inner ring temperature coefficient of the air conditioner;
determining a first product value of the outer ring temperature coefficient and the outer ring temperature, and determining a second product value of the inner ring temperature coefficient and the inner ring temperature;
and adding the first product value on the basis of the initial opening, and subtracting the second product value to obtain the target opening of the electronic expansion valve.
Further, the determining the target suction superheat according to the target opening, the outer ring temperature, the inner ring temperature, and the initial suction superheat includes:
acquiring an outer ring adjusting coefficient of the electronic expansion valve, an inner ring adjusting coefficient of the electronic expansion valve and an initial inspiration superheat degree;
determining a third product value of the outer ring adjustment coefficient and the outer ring temperature, and determining a fourth product value of the inner ring adjustment coefficient and the inner ring temperature;
and subtracting the third product value from the initial suction superheat degree, and adding the fourth product value to obtain the target suction superheat degree.
Further, the determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner includes:
the method comprises the steps of periodically obtaining the air suction temperature of an air suction port of a compressor through an air suction temperature sensor, and periodically obtaining the air suction pressure of the air suction port of the compressor through an air suction pressure sensor;
determining an air suction saturation temperature corresponding to the air suction pressure according to a preset mapping table;
and taking the difference value between the suction air temperature and the suction air saturation temperature as the actual suction air superheat degree.
Further, the determining the adjustment variable of the electronic expansion valve according to the target suction superheat degree and the actual suction superheat degree includes:
acquiring a first actual suction superheat degree of a current period n and a second actual suction superheat degree of the period n-1;
determining a first difference between the target suction superheat and the first actual suction superheat and a second difference between the target suction superheat and the second actual suction superheat;
if the target difference value of the first difference value and the second difference value exceeds a preset range, a third difference value between the target suction superheat degree and a third actual suction superheat degree in a period n-2 is obtained;
and determining the adjusting variable of the electronic expansion valve according to the preset coefficient, the first difference value, the second difference value and the third difference value of the electronic expansion valve.
Further, after determining the first difference between the target suction superheat and the first actual suction superheat, the method includes:
and if the target difference value is within the preset range, determining that the adjusting variable is zero.
Further, after controlling the electronic expansion valve to perform opening adjustment according to the adjustment variable, the method further includes:
and after receiving the shutdown signal, controlling the electronic expansion valve to be closed, and maintaining normal operation of components except the electronic expansion valve.
In a fourth aspect, the present application also provides a computer storage medium storing computer executable instructions for executing the method for adjusting the opening of the electronic expansion valve of the air conditioner according to any one of the above aspects of the present application.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: the application avoids adopting the fixed superheat degree of the air suction temperature, but continuously adjusts the superheat degree according to the actual inner ring temperature, the outer ring temperature, the air suction temperature and the air suction pressure, thereby the opening degree of the electronic expansion valve can be adjusted, the application is suitable for a wider use temperature range of a unit and avoids the unit from malfunctioning.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a schematic system diagram of a condensing unit according to an embodiment of the present application;
fig. 2 is a flowchart of a method for adjusting an opening of an electronic expansion valve of an air conditioner according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an apparatus for adjusting an opening of an electronic expansion valve of an air conditioner according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an air conditioner according to an embodiment of the present application.
Wherein, 1 is a compressor, 2 oil separators, 3 condensers, 4 is an electronic expansion valve, 5 is an evaporator, 6 is a vapor-liquid separator, and 7 is a controller.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following disclosure provides many different embodiments, or examples, for implementing different structures of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below.
The embodiment of the application provides a system schematic diagram of a condensing unit, as shown in fig. 1, wherein the condensing unit comprises a compressor 1, an oil separator 2, a condenser 3, an electronic expansion valve 4, an evaporator 5, a vapor-liquid separator 6 and a controller 7. An outer ring temperature sensor is arranged on the return air side of the condenser, an air suction temperature sensor and an air suction pressure sensor are arranged at the air suction outlet of the compressor, and an inner ring temperature sensor is arranged on the evaporator.
The outer ring temperature sensor is used for detecting the outer ring temperature T Outer ring The suction temperature sensor is used for detecting suction temperature T Inhalation of air The suction pressure sensor is used for detecting suction pressure P Inhalation of air The inner ring temperature sensor is used for detecting the suction temperature T Inner ring 。
The outlet of the variable frequency compressor outputs low-temperature low-pressure refrigerant, the oil separator separates oil dissolved in the refrigerant, the high-temperature high-pressure gaseous refrigerant is changed into normal-temperature high-pressure liquid refrigerant after passing through the condenser, the liquid refrigerant is changed into low-temperature low-pressure gas-liquid mixed refrigerant after passing through the electronic expansion valve, the gas-liquid mixed refrigerant is evaporated in the evaporator to become low-temperature low-pressure gaseous refrigerant, the gas-liquid separation is carried out in the gas-liquid separator, the phenomenon that the liquid refrigerant is damaged due to the fact that the liquid refrigerant returns to the compressor due to incomplete evaporation is avoided, and the gaseous refrigerant returns to the inlet of the variable frequency compressor.
The following will describe in detail a method for adjusting the opening of an electronic expansion valve of an air conditioner according to an embodiment of the present application with reference to a specific embodiment, as shown in fig. 2, the specific steps are as follows:
step 201: and determining the target suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner.
When the air conditioning unit is in a power-on state, the air conditioner detects the outer ring temperature T through the outer ring temperature sensor Outer ring And detects the inner ring temperature T through an inner ring temperature sensor Inner ring . And determining the target opening of the electronic expansion valve according to the detected outer ring temperature and the detected inner ring temperature.
After the unit receives a starting instruction, the electronic expansion valve operates according to the target opening degree, and other components operate according to original logic. After the electronic expansion valve runs for a preset time with the target opening, the controller determines the target suction superheat according to the target opening, the outer ring temperature, the inner ring temperature and the initial suction superheat.
Step 202: and determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner.
Air conditioner detects air suction temperature T through air suction temperature sensor Inhalation of air And the suction pressure P is detected by the suction pressure sensor Inhalation of air And then determining the suction saturation temperature corresponding to the suction pressure according to a preset mapping table, and finally taking the difference value between the suction temperature and the suction saturation temperature as the actual suction superheat degree. Wherein, the preset mapping table is provided with one air suction corresponding to each air suction pressureSaturation temperature.
Step 203: and determining the adjusting variable of the electronic expansion valve according to the target suction superheat degree and the actual suction superheat degree.
Air conditioner according to target air suction superheat degree T sh And the actual suction superheat T in a plurality of periods s And determining the adjustment variable of the electronic expansion valve.
Step 204: and controlling the electronic expansion valve to adjust the opening according to the adjusting variable.
And the air conditioner control electronic expansion valve adjusts the opening according to the adjusting variable.
In the application, the target air suction superheat degree is determined through the actual outer ring temperature and the inner ring temperature, the actual air suction superheat degree is determined through the actual air suction temperature and the air suction pressure, and finally the opening degree of the electronic expansion valve is adjusted according to the target air suction superheat degree and the actual air suction superheat degree.
As an alternative embodiment, determining the target opening degree of the electronic expansion valve according to the detected outer ring temperature and inner ring temperature includes: acquiring the outer ring temperature, the inner ring temperature, the initial opening of an electronic expansion valve, the outer ring temperature coefficient and the inner ring temperature coefficient of the air conditioner; determining a first product value of the outer ring temperature coefficient and the outer ring temperature, and determining a second product value of the inner ring temperature coefficient and the inner ring temperature; and adding the first product value on the basis of the initial opening, and subtracting the second product value to obtain the target opening of the electronic expansion valve.
The formula of the target opening degree is as follows:
B 0 ＝B 1 +K 3 *T outer ring -K 4 *T Inner ring
Wherein B is 0 Is the target opening degree of the electronic expansion valve, and B1 is the initial opening degree of the electronic expansion valve Start to start Degree, K 3 For the outer ring temperature coefficient, T Outer ring At the outer ring temperature, K 4 Is the temperature coefficient of the inner ring, T Inner ring Is the inner ring temperature.
Equation B 0 ＝B 1 +K 3 *T Outer ring -K 4 *T Inner ring According to the difference of the selected electronic expansion hair, parameter B 1 、K 3 、K 4 With the difference, in general B 1 The value range is 30-50, K 3 And K 4 The value range is 0.1-1.
According to the formula, the electronic expansion target opening of the unit can be calculated to increase along with the increase of the outer ring temperature and decrease along with the increase of the inner ring temperature. When the temperature of the outer ring of the unit continuously rises, the condensing pressure of the unit correspondingly rises, and the pressure difference between the high pressure and the low pressure of the unit can be reduced by increasing the opening of the initial electronic expansion valve, so that the problem of overhigh high pressure of the unit can be solved by increasing the target opening of the electronic expansion valve under the same indoor working condition, and the problem of overhigh high pressure starting of the unit under the maximum load working condition is solved;
when the temperature of the outer ring is unchanged and the temperature of the inner ring is reduced, the air suction pressure of the unit is continuously reduced, so that when the steps of the same initial electronic expansion valve are counted, the unit is started at the low inner ring temperature, the phenomenon that the air suction pressure is too low frequently occurs, and the target opening (steps) of the electronic expansion valve is increased along with the reduction of the temperature of the inner ring, so that the low-load starting air suction pressure is improved;
when the temperature of the outer ring is increased and the temperature of the inner ring is reduced, the unit is started under the working condition, and the exhaust temperature is often too high, so that the refrigerant circulation quantity of the unit can be increased and the suction superheat degree can be reduced by increasing the target opening degree (step number) of the electronic expansion valve, thereby reducing the exhaust temperature of the unit under high pressure difference.
Therefore, the electronic expansion valve target opening degree is automatically calculated according to the outer ring temperature and the inner ring temperature, so that the electronic expansion valve target opening degree of the unit is guaranteed to be in an optimal state under different environment temperatures, the unit can be quickly regulated, and the reliability of the unit during starting can be improved.
As an alternative embodiment, determining the target suction superheat according to the target opening degree, the outer ring temperature, the inner ring temperature, and the initial suction superheat includes: acquiring an outer ring adjusting coefficient of the electronic expansion valve, an inner ring adjusting coefficient of the electronic expansion valve and an initial inspiration superheat degree; determining a third product value of the outer ring adjusting coefficient and the outer ring temperature, and determining a fourth product value of the inner ring adjusting coefficient and the inner ring temperature; and subtracting the third product value from the initial suction superheat value, and adding the fourth product value to obtain the target suction superheat value.
T sh ＝T 0 -K 1 *T Outer ring +K 2 *T Inner ring
Wherein T is sh For target suction superheat, T 0 To the initial suction superheat, K 1 For the outer ring adjusting coefficient, T Outer ring At the outer ring temperature, K 2 For the inner ring adjustment factor, T Inner ring Is the inner ring temperature.
In formula T sh ＝T 0 -K 1 *T Outer ring +K 2 *T Inner ring In, in general T 0 The value range is 4-8,K 1 And K 2 The value range is 0.01-0.2. The application improves the energy efficiency of the unit at high ring temperature to be lower and improves the suction pressure of the unit at low load working condition to be lower.
As an alternative embodiment, determining the adjustment variable of the electronic expansion valve based on the target suction superheat and the actual suction superheat includes: acquiring a first actual suction superheat degree of a current period n and a second actual suction superheat degree of the period n-1; determining a first difference value between the target suction superheat degree and the first actual suction superheat degree and a second difference value between the target suction superheat degree and the second actual suction superheat degree; if the target difference value of the first difference value and the second difference value exceeds the preset range, a third difference value between the target suction superheat degree and a third actual suction superheat degree in the period n-2 is obtained; and determining an adjusting variable of the electronic expansion valve according to the preset coefficient, the first difference value, the second difference value and the third difference value of the electronic expansion valve.
The controller periodically acquires the intake air temperature through the intake air temperature sensor and periodically acquires the intake air pressure through the intake air pressure sensor, for example, the acquisition of the intake air temperature and the intake air pressure is detected every ten seconds, that is, the acquisition of the data has periodicity.
The controller obtains the first actual suction superheat degree of the current period n, and then determines the target suction superheat degree T sh And the first actual suction superheat degree T s1 Is the first difference e of (2) k And determining the target suction superheat T sh And the second actual suction superheat degree T s2 Is a second difference e of (2) k-1 Then determine the first difference e k And a second difference e k-1 Target difference Δe between k If the target difference delta e k Beyond a preset range, e.g. Δe k With < -1 > or Deltaek > 1, the target suction superheat T is determined sh And the third actual suction superheat T in the period n-2 s3 Third difference e of (2) k-2 The method comprises the steps of carrying out a first treatment on the surface of the And determining an adjusting variable of the electronic expansion valve according to the preset coefficient, the first difference value, the second difference value and the third difference value of the electronic expansion valve.
The formula of the regulating variable of the electronic expansion valve is as follows:
Δu＝K p ·{(e k -e k-1 )+K i ·e k +K j ·(e k -2e k-1 +e k-2 )
wherein Deltau is the regulating variable of the electronic expansion valve, e k E is the first difference value e k-1 E is the second difference value e k-2 Is the third difference, K i For a preset differential coefficient, K j To preset integral coefficient, K p Is a preset constant coefficient.
As an alternative embodiment, after determining the first difference between the target suction superheat and the first actual suction superheat, the method includes: and if the target difference value is within the preset range, determining that the adjusting variable is zero.
If the target difference delta e k Within a preset range, for example, -1 < Δek < 1, the unit enters a dead zone adjustment, Δu=0, indicating that the adjustment variable is zero.
As an optional implementation manner, after the electronic expansion valve is controlled to perform opening adjustment according to the adjustment variable, the method further includes: after receiving the shutdown signal, the controller controls the electronic expansion valve to be closed, and maintains normal operation of components except the electronic expansion valve.
The application also provides a flow of a method for adjusting the opening of the electronic expansion valve of the air conditioner, which specifically comprises the following steps:
1. powering up refrigerating unit and detecting T Outer ring 、T Inhalation of air 、P Inhalation of air And T Inner ring 。
2. Calculating the target opening of the electronic expansion valve:
B 0 ＝B 1 +K 3 *T outer ring -K 4 *T Inner ring 。
3. The electronic expansion valve operates for 3min at the target opening degree, and other parts of the unit operate according to the original logic.
4. Calculating target inspiration superheat degree:
T sh ＝T 0 -K 1 *T outer ring +K 2 *T Inner ring 。
5. According to T Inhalation of air And P Inhalation of air Corresponding steam temperature, calculating the first actual suction superheat T of the current period n s1 And a first actual suction superheat T of period n-1 s2 。
6. Calculate T sh And T is s1 Is the first difference e of (2) k And T sh And T is s2 Is a second difference e of (2) k-1 。
7. Calculate e k_ e k-1 Is a target difference deltae of (2) k 。
8.-1 < Δek < 1, the unit enters dead band adjustment, Δu=0, indicating that the adjustment variable is zero.
9.Δe k＜-1 Or Δe k＞ 1, the adjusting variable is
Δu＝K p ·{(e k -e k-1 )+K i ·e k +K j ·(e k -2e k-1 +e k-2 )。
Based on the same technical concept, the application provides an adjusting device for the opening of an electronic expansion valve of an air conditioner, as shown in fig. 3, the device comprises:
a first determining module 301, configured to determine a target suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner;
a second determining module 302, configured to determine an actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner;
a third determining module 303, configured to determine an adjustment variable of the electronic expansion valve according to the target suction superheat degree and the actual suction superheat degree;
and the control module 304 is used for controlling the electronic expansion valve to adjust the opening according to the adjustment variable.
Further, the first determining module 301 includes:
the first determining unit is used for determining the target opening of the electronic expansion valve according to the detected outer ring temperature and inner ring temperature after the air conditioner is electrified;
and the second determining unit is used for determining the target air suction superheat according to the target opening, the outer ring temperature, the inner ring temperature and the initial air suction superheat after controlling the electronic expansion valve to run for a preset time with the target opening.
Optionally, the first determining unit is configured to:
acquiring the outer ring temperature, the inner ring temperature, the initial opening of an electronic expansion valve, the outer ring temperature coefficient and the inner ring temperature coefficient of the air conditioner;
determining a first product value of the outer ring temperature coefficient and the outer ring temperature, and determining a second product value of the inner ring temperature coefficient and the inner ring temperature;
and adding the first product value on the basis of the initial opening, and subtracting the second product value to obtain the target opening of the electronic expansion valve.
Optionally, the second determining unit is configured to:
acquiring an outer ring adjusting coefficient of the electronic expansion valve, an inner ring adjusting coefficient of the electronic expansion valve and an initial inspiration superheat degree;
determining a third product value of the outer ring adjusting coefficient and the outer ring temperature, and determining a fourth product value of the inner ring adjusting coefficient and the inner ring temperature;
and subtracting the third product value from the initial suction superheat value, and adding the fourth product value to obtain the target suction superheat value.
Optionally, the second determining module 302 is configured to:
the method comprises the steps of periodically obtaining the air suction temperature of an air suction port of a compressor through an air suction temperature sensor, and periodically obtaining the air suction pressure of the air suction port of the compressor through an air suction pressure sensor;
determining an air suction saturation temperature corresponding to the air suction pressure according to a preset mapping table;
the difference between the suction air temperature and the suction air saturation temperature is taken as the actual suction superheat.
Optionally, the third determining module 303 is configured to:
acquiring a first actual suction superheat degree of a current period n and a second actual suction superheat degree of the period n-1;
determining a first difference value between the target suction superheat degree and the first actual suction superheat degree and a second difference value between the target suction superheat degree and the second actual suction superheat degree;
if the target difference value of the first difference value and the second difference value exceeds the preset range, a third difference value between the target suction superheat degree and a third actual suction superheat degree in the period n-2 is obtained;
and determining an adjusting variable of the electronic expansion valve according to the preset coefficient, the first difference value, the second difference value and the third difference value of the electronic expansion valve.
Optionally, the device is further configured to:
and if the target difference value is within the preset range, determining that the adjusting variable is zero.
As shown in fig. 4, an embodiment of the present application provides an air conditioner, which includes a processor 401, a communication interface 402, a memory 403, and a communication bus 404, wherein the processor 401, the communication interface 402, and the memory 403 perform communication with each other through the communication bus 404,
a memory 403 for storing a computer program;
in one embodiment of the present application, the processor 401 is configured to implement the control method for adjusting the opening of the electronic expansion valve of the air conditioner provided in any one of the foregoing method embodiments when executing the program stored in the memory 403, where the method includes:
determining target air suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner;
determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner;
determining an adjusting variable of the electronic expansion valve according to the target air suction superheat degree and the actual air suction superheat degree;
and controlling the electronic expansion valve to adjust the opening according to the adjusting variable.
Further, determining the target suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner includes:
after the air conditioner is electrified, determining the target opening of the electronic expansion valve according to the detected outer ring temperature and the detected inner ring temperature;
and after the electronic expansion valve is controlled to run for a preset time at the target opening, determining the target suction superheat according to the target opening, the outer ring temperature, the inner ring temperature and the initial suction superheat.
Optionally, determining the target opening of the electronic expansion valve according to the detected outer ring temperature and inner ring temperature includes:
acquiring the outer ring temperature, the inner ring temperature, the initial opening of an electronic expansion valve, the outer ring temperature coefficient and the inner ring temperature coefficient of the air conditioner;
determining a first product value of the outer ring temperature coefficient and the outer ring temperature, and determining a second product value of the inner ring temperature coefficient and the inner ring temperature;
and adding the first product value on the basis of the initial opening, and subtracting the second product value to obtain the target opening of the electronic expansion valve.
Optionally, determining the target suction superheat according to the target opening, the outer ring temperature, the inner ring temperature, and the initial suction superheat includes:
acquiring an outer ring adjusting coefficient of the electronic expansion valve, an inner ring adjusting coefficient of the electronic expansion valve and an initial inspiration superheat degree;
determining a third product value of the outer ring adjusting coefficient and the outer ring temperature, and determining a fourth product value of the inner ring adjusting coefficient and the inner ring temperature;
and subtracting the third product value from the initial suction superheat value, and adding the fourth product value to obtain the target suction superheat value.
Optionally, determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner includes:
the method comprises the steps of periodically obtaining the air suction temperature of an air suction port of a compressor through an air suction temperature sensor, and periodically obtaining the air suction pressure of the air suction port of the compressor through an air suction pressure sensor;
determining an air suction saturation temperature corresponding to the air suction pressure according to a preset mapping table;
the difference between the suction air temperature and the suction air saturation temperature is taken as the actual suction superheat.
Optionally, determining the adjustment variable of the electronic expansion valve according to the target suction superheat degree and the actual suction superheat degree includes:
acquiring a first actual suction superheat degree of a current period n and a second actual suction superheat degree of the period n-1;
determining a first difference value between the target suction superheat degree and the first actual suction superheat degree and a second difference value between the target suction superheat degree and the second actual suction superheat degree;
if the target difference value of the first difference value and the second difference value exceeds the preset range, a third difference value between the target suction superheat degree and a third actual suction superheat degree in the period n-2 is obtained;
and determining an adjusting variable of the electronic expansion valve according to the preset coefficient, the first difference value, the second difference value and the third difference value of the electronic expansion valve.
Optionally, after determining the first difference between the target suction superheat and the first actual suction superheat, the method includes:
and if the target difference value is within the preset range, determining that the adjusting variable is zero.
The embodiment of the application also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method for adjusting the opening of the electronic expansion valve of the air conditioner provided in any one of the method embodiments.
The apparatus embodiments described above are merely illustrative, wherein elements illustrated as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus a general purpose hardware platform, or may be implemented by hardware. Based on such understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the related art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method of the respective embodiments or some parts of the embodiments.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The method for adjusting the opening of the electronic expansion valve of the air conditioner is characterized by comprising the following steps of:
determining target air suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner;
determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner;
determining an adjusting variable of the electronic expansion valve according to the target air suction superheat degree and the actual air suction superheat degree;
and controlling the electronic expansion valve to adjust the opening according to the adjusting variable.
2. The method of claim 1, wherein determining the target suction superheat based on the detected outer and inner ring temperatures of the air conditioner comprises:
after the air conditioner is electrified, determining the target opening of the electronic expansion valve according to the detected outer ring temperature and the detected inner ring temperature;
and after the electronic expansion valve is controlled to run for a preset time with the target opening, determining a target air suction superheat according to the target opening, the outer ring temperature, the inner ring temperature and the initial air suction superheat.
3. The method of claim 2, wherein determining the target opening of the electronic expansion valve based on the detected outer ring temperature and inner ring temperature comprises:
acquiring the outer ring temperature, the inner ring temperature, the initial opening of an electronic expansion valve, the outer ring temperature coefficient and the inner ring temperature coefficient of the air conditioner;
determining a first product value of the outer ring temperature coefficient and the outer ring temperature, and determining a second product value of the inner ring temperature coefficient and the inner ring temperature;
and adding the first product value on the basis of the initial opening, and subtracting the second product value to obtain the target opening of the electronic expansion valve.
4. The method of claim 2, wherein said determining a target suction superheat based on said target opening, said outer ring temperature, said inner ring temperature, and an initial suction superheat comprises:
acquiring an outer ring adjusting coefficient of the electronic expansion valve, an inner ring adjusting coefficient of the electronic expansion valve and an initial inspiration superheat degree;
determining a third product value of the outer ring adjustment coefficient and the outer ring temperature, and determining a fourth product value of the inner ring adjustment coefficient and the inner ring temperature;
and subtracting the third product value from the initial suction superheat degree, and adding the fourth product value to obtain the target suction superheat degree.
5. The method of claim 1, wherein determining the actual suction superheat based on the detected suction temperature and suction pressure of the air conditioner comprises:
the method comprises the steps of periodically obtaining the air suction temperature of an air suction port of a compressor through an air suction temperature sensor, and periodically obtaining the air suction pressure of the air suction port of the compressor through an air suction pressure sensor;
determining an air suction saturation temperature corresponding to the air suction pressure according to a preset mapping table;
and taking the difference value between the suction air temperature and the suction air saturation temperature as the actual suction air superheat degree.
6. The method of claim 1, wherein said determining the adjustment variable of the electronic expansion valve based on the target suction superheat and the actual suction superheat comprises:
acquiring a first actual suction superheat degree of a current period n and a second actual suction superheat degree of the period n-1;
determining a first difference between the target suction superheat and the first actual suction superheat and a second difference between the target suction superheat and the second actual suction superheat;
if the target difference value of the first difference value and the second difference value exceeds a preset range, a third difference value between the target suction superheat degree and a third actual suction superheat degree in a period n-2 is obtained;
and determining the adjusting variable of the electronic expansion valve according to the preset coefficient, the first difference value, the second difference value and the third difference value of the electronic expansion valve.
7. The method of claim 6, wherein after determining the first difference between the target suction superheat and the first actual suction superheat, the method comprises:
and if the target difference value is within the preset range, determining that the adjusting variable is zero.
8. An adjusting device for the opening degree of an electronic expansion valve of an air conditioner is characterized in that the device comprises:
the first determining module is used for determining target suction superheat according to the detected outer ring temperature and inner ring temperature of the air conditioner;
the second determining module is used for determining the actual suction superheat according to the detected suction temperature and suction pressure of the air conditioner;
the third determining module is used for determining the adjusting variable of the electronic expansion valve according to the target suction superheat degree and the actual suction superheat degree;
and the control module is used for controlling the electronic expansion valve to adjust the opening according to the adjusting variable.
9. The air conditioner is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
a memory for storing a computer program;
a processor for implementing the method of any of claims 1-7 when executing a program stored on a memory.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a processor, implements the method of any of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310749073.XA CN116772381A (en) | 2023-06-21 | 2023-06-21 | Method and device for adjusting opening of electronic expansion valve of air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310749073.XA CN116772381A (en) | 2023-06-21 | 2023-06-21 | Method and device for adjusting opening of electronic expansion valve of air conditioner |
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| CN116772381A true CN116772381A (en) | 2023-09-19 |
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| CN202310749073.XA Pending CN116772381A (en) | 2023-06-21 | 2023-06-21 | Method and device for adjusting opening of electronic expansion valve of air conditioner |
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| Country | Link |
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| CN (1) | CN116772381A (en) |
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