CN113203225A - Control method of double-electronic expansion valve - Google Patents
Control method of double-electronic expansion valve Download PDFInfo
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- CN113203225A CN113203225A CN202110454256.XA CN202110454256A CN113203225A CN 113203225 A CN113203225 A CN 113203225A CN 202110454256 A CN202110454256 A CN 202110454256A CN 113203225 A CN113203225 A CN 113203225A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of heat pump energy conservation, and particularly discloses a control method of a double-electronic expansion valve, wherein the double-electronic expansion valve comprises a main-circuit electronic expansion valve and an auxiliary-circuit electronic expansion valve, and the control method of the double-electronic expansion valve comprises the following steps: acquiring real-time data of an air suction pressure sensor; calculating the current suction superheat degree of the air conditioning system according to the real-time data of the suction pressure sensor; comparing the current air suction superheat degree of the air conditioning system with a target air suction superheat degree, and obtaining a first comparison result; controlling the opening degree of the main electronic expansion valve according to the first comparison result; acquiring real-time data of an exhaust pressure sensor; determining the control state of the auxiliary electronic expansion valve according to the real-time data of the exhaust temperature sensor; and controlling the opening degree of the auxiliary electronic expansion valve according to the control state of the auxiliary electronic expansion valve. The control method of the double-electronic expansion valve provided by the invention can realize accurate control of the electronic expansion valve and has the advantages of high control accuracy and strong reliability.
Description
Technical Field
The invention relates to the technical field of heat pump energy conservation, in particular to a control method of a double-electronic expansion valve.
Background
In recent years, with the liquid injection enthalpy increasing technology being more widely used, the requirement on an expansion valve is higher. The prior art mostly adopts thermal expansion, the control mode is mechanical, intelligent adjustment cannot be realized, and the prior art cannot be applied to an environment with supercooling or overheating because of low precision. The applicable environment range is limited.
Therefore, how to provide a high-precision control method is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention provides a control method of a double-electronic expansion valve, which solves the problem that the control of the expansion valve with high precision can not be realized in the related technology.
As one aspect of the present invention, there is provided a control method of a dual electronic expansion valve, wherein the dual electronic expansion valve includes a main electronic expansion valve and a sub electronic expansion valve, the control method of the dual electronic expansion valve including:
acquiring real-time data of an air suction pressure sensor;
calculating the current suction superheat degree of the air conditioning system according to the real-time data of the suction pressure sensor;
comparing the current air suction superheat degree of the air conditioning system with a target air suction superheat degree, and obtaining a first comparison result;
controlling the opening degree of the main electronic expansion valve according to the first comparison result;
acquiring real-time data of an exhaust temperature sensor;
determining the control state of the auxiliary electronic expansion valve according to the real-time data of the exhaust temperature sensor;
and controlling the opening degree of the auxiliary electronic expansion valve according to the control state of the auxiliary electronic expansion valve.
Further, the calculating the current suction superheat degree of the air conditioning system according to the real-time data of the suction pressure sensor comprises the following steps:
acquiring the suction pressure according to the real-time data of the suction pressure sensor;
calculating according to the suction pressure to obtain evaporation saturation temperature;
acquiring the air suction temperature acquired by an air suction temperature sensor;
and calculating the difference value between the suction temperature and the evaporation saturation temperature to obtain the current suction superheat degree.
Further, the comparing the current suction superheat of the air conditioning system with the target suction superheat and obtaining a first comparison result comprises:
determining the initial opening degree of the main-path electronic expansion valve according to the running state of the air-conditioning system;
judging the size relationship between the current air suction superheat degree and the target air suction superheat degree;
if the current air suction superheat degree is smaller than the target air suction superheat degree, outputting a control signal for closing the initial opening degree of the main-path electronic expansion valve;
and if the current suction superheat degree is larger than the target suction superheat degree, outputting a control signal for opening the initial opening degree of the main-path electronic expansion valve.
Further, the controlling the opening degree of the main-path electronic expansion valve according to the first comparison result includes:
and controlling the initial opening degree of the main-path electronic expansion valve to be reduced according to the control signal for reducing the initial opening degree of the main-path electronic expansion valve.
Further, the controlling the opening degree of the main-path electronic expansion valve according to the first comparison result includes:
and controlling the initial opening degree of the main-path electronic expansion valve to be increased according to the control signal for increasing the initial opening degree of the main-path electronic expansion valve.
Further, the determining the initial opening degree of the main circuit electronic expansion valve according to the operation state of the air conditioning system includes:
initial opening degree k2 k1 (110- (1.5 condensation side temperature) + (0.75 evaporation side temperature)),
when the air conditioning system is in a refrigerating state, k1 is 0.5, and k2 is 1;
when the air-conditioning system is in a heating state, k1 is obtained according to the temperature return section of the air-conditioning system, and k2 is obtained by calculation according to the environment temperature of the air-conditioning system.
Further, the determining the control state of the auxiliary electronic expansion valve according to the real-time data of the exhaust temperature sensor comprises:
determining the current exhaust temperature according to the real-time data of the exhaust temperature sensor;
and comparing the current exhaust temperature with a preset exhaust temperature threshold, and determining the control state of the auxiliary electronic expansion valve according to the comparison result.
Further, the comparing the current exhaust temperature with a preset exhaust temperature threshold value and determining the control state of the auxiliary electronic expansion valve according to the comparison result includes:
if the current exhaust temperature is smaller than a first preset exhaust temperature threshold value, determining that the auxiliary electronic expansion valve enters a low exhaust temperature control state;
if the current exhaust temperature is greater than a first preset exhaust temperature threshold and less than a second preset exhaust temperature threshold, determining that the auxiliary electronic expansion valve enters a superheat degree adjusting state;
if the current exhaust temperature is greater than a second preset exhaust temperature threshold and less than a third preset exhaust temperature threshold, determining that the auxiliary electronic expansion valve enters a high exhaust temperature control state;
the first preset exhaust temperature threshold is smaller than a second preset exhaust temperature threshold, and the second preset exhaust temperature threshold is smaller than a third preset exhaust temperature threshold.
Further, when the auxiliary electronic expansion valve enters a low exhaust temperature control state, controlling the opening degree of the auxiliary electronic expansion valve to be reduced;
when the auxiliary electronic expansion valve enters a superheat degree adjusting state, controlling the opening degree of the auxiliary electronic expansion valve according to the current exhaust superheat degree;
and when the auxiliary electronic expansion valve enters a high exhaust temperature control state, controlling the opening degree of the auxiliary electronic expansion valve according to the real-time change of the current exhaust temperature.
Further, when the auxiliary electronic expansion valve enters the superheat degree adjusting state, controlling the opening degree of the auxiliary electronic expansion valve according to the current exhaust superheat degree, comprising:
calculating according to the current exhaust temperature to obtain evaporation saturation;
calculating the difference value between the current exhaust temperature and the initial temperature to obtain the current exhaust superheat degree;
and determining the opening degree of the auxiliary electronic expansion valve according to the comparison result of the current exhaust superheat degree and the target exhaust superheat degree.
The control method of the double-electronic expansion valve provided by the invention realizes the control of the opening degree of the double-electronic expansion valve in the air-conditioning system through the superheat degree, wherein the main-circuit electronic expansion valve mainly adopts suction superheat degree control, and the auxiliary-circuit electronic expansion valve mainly adopts exhaust superheat degree control, can realize the accurate control of the electronic expansion valve, and has the advantages of high control precision and strong reliability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flow chart of a control method of a dual electronic expansion valve provided by the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this embodiment, a control method for a dual electronic expansion valve is provided, where the dual electronic expansion valve includes a main electronic expansion valve and a sub-electronic expansion valve, and fig. 1 is a flowchart of a control method for a dual electronic expansion valve according to an embodiment of the present invention, as shown in fig. 1, including:
s110, acquiring real-time data of the air suction pressure sensor;
in the embodiment of the invention, the current suction temperature of the air conditioning system can be obtained through the suction pressure sensor so as to facilitate the calculation of the superheat degree.
S120, calculating the current air suction superheat degree of the air conditioning system according to the real-time data of the air suction pressure sensor;
in an embodiment of the present invention, the calculating a current suction superheat degree of the air conditioning system according to the real-time data of the suction pressure sensor includes:
acquiring the suction pressure according to the real-time data of the suction pressure sensor;
calculating according to the suction pressure to obtain evaporation saturation temperature;
acquiring the air suction temperature acquired by an air suction temperature sensor;
and calculating the difference value between the suction temperature and the evaporation saturation temperature to obtain the current suction superheat degree.
It should be understood that the evaporation saturation temperature calculated from the suction pressure may specifically be calculated from a conversion formula of the suction pressure and the evaporation saturation temperature.
Preferably, the current suction superheat = suction temperature-evaporation saturation temperature.
S130, comparing the current air suction superheat degree of the air conditioning system with a target air suction superheat degree, and obtaining a first comparison result;
specifically, determining the initial opening degree of the main electronic expansion valve according to the running state of the air conditioning system;
judging the size relationship between the current air suction superheat degree and the target air suction superheat degree;
if the current air suction superheat degree is smaller than the target air suction superheat degree, outputting a control signal for closing the initial opening degree of the main-path electronic expansion valve;
and if the current suction superheat degree is larger than the target suction superheat degree, outputting a control signal for opening the initial opening degree of the main-path electronic expansion valve.
In the embodiment of the invention, the superheat degree is usually lower and is difficult to rise during low-ring-temperature heating, the target suction superheat degree can be set and referred to a period of time after the compressor runs for 3 minutes and is kept unchanged, and the set target suction superheat degree is about 4 degrees larger than the superheat degree at the moment and is proper.
In addition, the electronic expansion valve opening corresponding to the optimal energy efficiency under each working condition can be found through manually debugging the electronic expansion valve, the current superheat degree at the moment is recorded, and the superheat degree is used as a parameter of the target suction superheat degree.
S140, controlling the opening degree of the main electronic expansion valve according to the first comparison result;
in some embodiments, the initial opening degree of the main-path electronic expansion valve is controlled to be decreased according to a control signal for decreasing the initial opening degree of the main-path electronic expansion valve.
In some embodiments, the initial opening degree of the main-path electronic expansion valve is controlled according to a control signal for the initial opening degree of the main-path electronic expansion valve.
When the compressor of the air conditioning system is not operating, the electronic expansion valve is opened to the standby opening, when the compressor is defrosting, the electronic expansion valve is opened to the defrosting opening, and during defrosting, the exhaust superheat degree is lower than a certain value and continues for a while, and the main valve is closed to be small.
The opening is carried out to the initial opening degree when the starting requirement exists, the opening valve of the press is adjusted according to the current air suction superheat degree after keeping the initial opening degree for a period of time, when the current air suction superheat degree is smaller than the target air suction superheat degree, the main valve is closed, and when the current air suction superheat degree is larger than the target air suction superheat degree, the main valve is opened. The greater the deviation of the "current suction superheat" from the "target suction superheat", the faster the valve adjustment.
During heating, in order to prevent low-pressure protection from being triggered, the action of the valve is specially treated aiming at the following conditions: when the temperature of the fin is lower than a certain value, the valve is not allowed to be closed.
Specifically, the determining the initial opening degree of the main circuit electronic expansion valve according to the operation state of the air conditioning system includes:
initial opening degree k2 k1 (110- (1.5 condensation side temperature) + (0.75 evaporation side temperature)),
when the air conditioning system is in a refrigerating state, k1 is 0.5, and k2 is 1;
when the air-conditioning system is in a heating state, k1 is obtained according to the temperature return section of the air-conditioning system, and k2 is obtained by calculation according to the environment temperature of the air-conditioning system.
Further specifically, when the air conditioning system is in a heating state, k1 obtains, according to the temperature return section of the air conditioning system:
when the return temperature of the air conditioning system is < = 20 degrees, k1 is 0.5;
when 20 ° < return temperature of air conditioning system < =45 °, k1 is 0.6;
when the system returned a temperature > 45 °, k1 was 1.0.
Further specifically, k2 is calculated according to the ambient temperature of the air conditioning system, and may include:
k2= ((ambient temperature + 20) × (initial open loop temperature coefficient-1.0)/40) + 1.0;
the initial opening degree compensation is carried out according to the ambient temperature,
when the ambient temperature is more than or equal to 20 ℃: k2= aInitial open loop temperature coefficient；
When the environmental temperature is less than or equal to minus 20 ℃: k2= 1;
-20 ℃ < ambient temperature < 20: k2 is 1-ALinear value of initial open loop temperature coefficient；
Wherein A isInitial open loop temperature coefficientThe range is 1.0-3.0.
It should be noted that the evaporation side temperature is high, the condensation side temperature is low, and the initial opening degree is large; otherwise, the initial opening degree is small.
If the calculation conditions are not complete (such as a probe failure), 70% is fixedly used as the initial opening. The maximum initial heating opening needs to be set as required, attention is paid to the heating conditions of low loop temperature and low water temperature and high loop temperature and high water temperature, if the initial opening is limited by the maximum initial heating opening, the initial opening is too small, low loop temperature and low water temperature are easy to generate low pressure protection, and high loop temperature and high water temperature are easy to generate high pressure protection.
S150, acquiring real-time data of the exhaust temperature sensor;
specifically, in the embodiment of the present invention, the current exhaust temperature can be acquired by acquiring real-time data of the exhaust temperature sensor.
S160, determining the control state of the auxiliary electronic expansion valve according to the real-time data of the exhaust temperature sensor;
specifically, the current exhaust temperature is determined according to the real-time data of the exhaust temperature sensor;
and comparing the current exhaust temperature with a preset exhaust temperature threshold, and determining the control state of the auxiliary electronic expansion valve according to the comparison result.
And S170, controlling the opening degree of the auxiliary electronic expansion valve according to the control state of the auxiliary electronic expansion valve.
Specifically, if the current exhaust temperature is less than a first preset exhaust temperature threshold T1Determining that the auxiliary electronic expansion valve enters a low exhaust temperature control state;
if the current exhaust temperature is greater than a first preset temperatureExhaust temperature threshold T1And is less than a second preset exhaust temperature threshold T2Determining that the auxiliary electronic expansion valve enters a superheat degree adjusting state;
if the current exhaust temperature is greater than a second preset exhaust temperature threshold T2And is less than a third preset exhaust temperature threshold T3Determining that the auxiliary electronic expansion valve enters a high exhaust temperature control state;
wherein the first preset exhaust temperature threshold T1Less than a second predetermined exhaust temperature threshold T2Second predetermined exhaust temperature threshold T2Less than a third predetermined exhaust temperature threshold T3。
In the embodiment of the invention, when the auxiliary electronic expansion valve enters the low exhaust temperature control state, the opening degree of the auxiliary electronic expansion valve is controlled to be reduced;
specifically, the current exhaust temperature is less than a first preset exhaust temperature threshold T1Entering low exhaust temperature control, reducing the opening degree of the auxiliary electronic expansion valve to the minimum opening degree by N steps every t1 seconds: the current exhaust temperature is more than or equal to a first preset exhaust temperature threshold T1And then the low exhaust temperature control is exited and the superheat degree adjustment is started.
When the auxiliary electronic expansion valve enters a superheat degree adjusting state, controlling the opening degree of the auxiliary electronic expansion valve according to the current exhaust superheat degree;
specifically, the evaporation saturation is calculated according to the current exhaust temperature;
calculating the difference value between the current exhaust temperature and the initial temperature to obtain the current exhaust superheat degree;
and determining the opening degree of the auxiliary electronic expansion valve according to the comparison result of the current exhaust superheat degree and the target exhaust superheat degree.
In the embodiment of the invention, the target exhaust superheat = make-up air temperature-post-valve temperature.
The current exhaust temperature is greater than a first preset exhaust temperature threshold T1(in the present example T1May be 75 deg.) and less than a second preset exhaust temperature threshold T2(in the present example T2Can be 95 deg.C) as superheat degreeAnd adjusting once every t2 (in the embodiment of the invention, t2 can be 10) seconds, adjusting once every-3 degrees and less than the current superheat degree, and adjusting once every-3 degrees and less than the target superheat degree and less than 3 degrees, wherein the valve is not adjusted, the valve is opened when the superheat degree difference is greater than 3 degrees, and the valve is closed when the superheat degree difference is less than-3 degrees.
When the second preset exhaust temperature threshold T is reached2< current exhaust temperature < third preset exhaust temperature threshold T3(in the present example T3The temperature can be 105 degrees), the high exhaust temperature control is carried out, and the target exhaust temperature is 100 degrees +/-3 degrees.
And when the auxiliary electronic expansion valve enters a high exhaust temperature control state, controlling the opening degree of the auxiliary electronic expansion valve according to the real-time change of the current exhaust temperature.
When the current exhaust temperature is more than or equal to 105 degrees, the opening of the air supply valve is larger by N1 (in the embodiment of the invention, 16 can be taken from N1), and high exhaust control is performed;
entering a high exhaust control state, judging the current exhaust temperature once every T3 (in the embodiment of the invention, T3 can be 20) seconds and recording the current exhaust temperature TnE.g. Tn+1-TnWhen the temperature is more than or equal to 1 ℃, opening a valve N2 (in the embodiment of the invention, 16 can be taken out from N2) of the auxiliary electronic expansion valve; such as-1 degree ≦ Tn+1-TnWhen the opening degree is less than 1 degree, the valve opening degree of the auxiliary electronic expansion valve is unchanged; such as Tn+1-TnWhen < -1 >, the valve N3 is closed (in the embodiment of the present invention, N3 may take 8) steps.
According to the control method of the double-electronic expansion valve provided by the embodiment of the invention, the opening degree of the double-electronic expansion valve in the air-conditioning system is controlled through the superheat degree, wherein the main-circuit electronic expansion valve is mainly controlled by the suction superheat degree, and the auxiliary-circuit electronic expansion valve is mainly controlled by the exhaust superheat degree, so that the electronic expansion valve can be accurately controlled, and the control method has the advantages of high control precision and high reliability.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A control method for a dual electronic expansion valve is characterized in that the dual electronic expansion valve comprises a main electronic expansion valve and an auxiliary electronic expansion valve, and the control method for the dual electronic expansion valve comprises the following steps:
acquiring real-time data of an air suction pressure sensor;
calculating the current suction superheat degree of the air conditioning system according to the real-time data of the suction pressure sensor;
comparing the current air suction superheat degree of the air conditioning system with a target air suction superheat degree, and obtaining a first comparison result;
controlling the opening degree of the main electronic expansion valve according to the first comparison result;
acquiring real-time data of an exhaust temperature sensor;
determining the control state of the auxiliary electronic expansion valve according to the real-time data of the exhaust temperature sensor;
and controlling the opening degree of the auxiliary electronic expansion valve according to the control state of the auxiliary electronic expansion valve.
2. The control method of the dual electronic expansion valve according to claim 1, wherein the calculating a current suction superheat of the air conditioning system based on the real-time data of the suction pressure sensor comprises:
acquiring the suction pressure according to the real-time data of the suction pressure sensor;
calculating according to the suction pressure to obtain evaporation saturation temperature;
acquiring the air suction temperature acquired by an air suction temperature sensor;
and calculating the difference value between the suction temperature and the evaporation saturation temperature to obtain the current suction superheat degree.
3. The control method of the dual electronic expansion valve according to claim 1, wherein the comparing the current suction superheat of the air conditioning system with the target suction superheat and obtaining the first comparison result comprises:
determining the initial opening degree of the main-path electronic expansion valve according to the running state of the air-conditioning system;
judging the size relationship between the current air suction superheat degree and the target air suction superheat degree;
if the current air suction superheat degree is smaller than the target air suction superheat degree, outputting a control signal for closing the initial opening degree of the main-path electronic expansion valve;
and if the current suction superheat degree is larger than the target suction superheat degree, outputting a control signal for opening the initial opening degree of the main-path electronic expansion valve.
4. The control method of the dual electronic expansion valve according to claim 3, wherein the controlling the opening degree of the main-circuit electronic expansion valve according to the first comparison result comprises:
and controlling the initial opening degree of the main-path electronic expansion valve to be reduced according to the control signal for reducing the initial opening degree of the main-path electronic expansion valve.
5. The control method of the dual electronic expansion valve according to claim 3, wherein the controlling the opening degree of the main-circuit electronic expansion valve according to the first comparison result comprises:
and controlling the initial opening degree of the main-path electronic expansion valve to be increased according to the control signal for increasing the initial opening degree of the main-path electronic expansion valve.
6. The control method of the dual electronic expansion valve according to claim 3, wherein the determining the initial opening degree of the main circuit electronic expansion valve according to the operation state of the air conditioning system comprises:
initial opening degree k2 k1 (110- (1.5 condensation side temperature) + (0.75 evaporation side temperature)),
when the air conditioning system is in a refrigerating state, k1 is 0.5, and k2 is 1;
when the air-conditioning system is in a heating state, k1 is obtained according to the temperature return section of the air-conditioning system, and k2 is obtained by calculation according to the environment temperature of the air-conditioning system.
7. The control method of the dual electronic expansion valve according to claim 1, wherein the determining the control state of the auxiliary electronic expansion valve according to the real-time data of the exhaust temperature sensor comprises:
determining the current exhaust temperature according to the real-time data of the exhaust temperature sensor;
and comparing the current exhaust temperature with a preset exhaust temperature threshold, and determining the control state of the auxiliary electronic expansion valve according to the comparison result.
8. The control method of the dual electronic expansion valve according to claim 7, wherein the comparing the current exhaust temperature with a preset exhaust temperature threshold and determining the control state of the auxiliary electronic expansion valve according to the comparison result comprises:
if the current exhaust temperature is smaller than a first preset exhaust temperature threshold value, determining that the auxiliary electronic expansion valve enters a low exhaust temperature control state;
if the current exhaust temperature is greater than a first preset exhaust temperature threshold and less than a second preset exhaust temperature threshold, determining that the auxiliary electronic expansion valve enters a superheat degree adjusting state;
if the current exhaust temperature is greater than a second preset exhaust temperature threshold and less than a third preset exhaust temperature threshold, determining that the auxiliary electronic expansion valve enters a high exhaust temperature control state;
the first preset exhaust temperature threshold is smaller than a second preset exhaust temperature threshold, and the second preset exhaust temperature threshold is smaller than a third preset exhaust temperature threshold.
9. The control method of a dual electronic expansion valve according to claim 8,
when the auxiliary electronic expansion valve enters a low exhaust temperature control state, controlling the opening degree of the auxiliary electronic expansion valve to be reduced;
when the auxiliary electronic expansion valve enters a superheat degree adjusting state, controlling the opening degree of the auxiliary electronic expansion valve according to the current exhaust superheat degree;
and when the auxiliary electronic expansion valve enters a high exhaust temperature control state, controlling the opening degree of the auxiliary electronic expansion valve according to the real-time change of the current exhaust temperature.
10. The control method of the dual electronic expansion valve according to claim 9, wherein the controlling the opening degree of the auxiliary electronic expansion valve according to the current exhaust superheat degree when the auxiliary electronic expansion valve enters the superheat degree adjusting state comprises:
calculating according to the current exhaust temperature to obtain evaporation saturation;
calculating the difference value between the current exhaust temperature and the initial temperature to obtain the current exhaust superheat degree;
and determining the opening degree of the auxiliary electronic expansion valve according to the comparison result of the current exhaust superheat degree and the target exhaust superheat degree.
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Cited By (2)
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| CN113819690A (en) * | 2021-08-10 | 2021-12-21 | 北京金茂绿建科技有限公司 | Heat pump system and electronic expansion valve control method |
| CN115654700A (en) * | 2022-10-12 | 2023-01-31 | 宁波奥克斯电气股份有限公司 | Air injection enthalpy increasing control method and device of air conditioner and air conditioner |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731322A (en) * | 2018-05-02 | 2018-11-02 | 深圳市深蓝电子股份有限公司 | A kind of super low temperature heat pump control system |
| CN208382670U (en) * | 2018-07-03 | 2019-01-15 | 浙江国祥股份有限公司 | A kind of air source heat pump |
| CN109612174A (en) * | 2018-12-12 | 2019-04-12 | 广东智科电子股份有限公司 | A kind of control method and its device of electric expansion valve |
| CN209588306U (en) * | 2018-12-13 | 2019-11-05 | 广东智科电子股份有限公司 | A kind of control device of electric expansion valve |
| CN111156667A (en) * | 2020-01-07 | 2020-05-15 | 青岛百时得智能系统有限公司 | Control method, device and equipment for air supply loop of air supply enthalpy-increasing compressor |
| CN111829173A (en) * | 2019-04-23 | 2020-10-27 | 杭州先途电子有限公司 | Control method and system and air source heat pump air heater |
| CN112503792A (en) * | 2020-11-30 | 2021-03-16 | 广东积微科技有限公司 | Low-temperature heat pump water machine enhanced vapor injection system and control method thereof |
-
2021
- 2021-04-26 CN CN202110454256.XA patent/CN113203225B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731322A (en) * | 2018-05-02 | 2018-11-02 | 深圳市深蓝电子股份有限公司 | A kind of super low temperature heat pump control system |
| CN208382670U (en) * | 2018-07-03 | 2019-01-15 | 浙江国祥股份有限公司 | A kind of air source heat pump |
| CN109612174A (en) * | 2018-12-12 | 2019-04-12 | 广东智科电子股份有限公司 | A kind of control method and its device of electric expansion valve |
| CN209588306U (en) * | 2018-12-13 | 2019-11-05 | 广东智科电子股份有限公司 | A kind of control device of electric expansion valve |
| CN111829173A (en) * | 2019-04-23 | 2020-10-27 | 杭州先途电子有限公司 | Control method and system and air source heat pump air heater |
| CN111156667A (en) * | 2020-01-07 | 2020-05-15 | 青岛百时得智能系统有限公司 | Control method, device and equipment for air supply loop of air supply enthalpy-increasing compressor |
| CN112503792A (en) * | 2020-11-30 | 2021-03-16 | 广东积微科技有限公司 | Low-temperature heat pump water machine enhanced vapor injection system and control method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819690A (en) * | 2021-08-10 | 2021-12-21 | 北京金茂绿建科技有限公司 | Heat pump system and electronic expansion valve control method |
| CN115654700A (en) * | 2022-10-12 | 2023-01-31 | 宁波奥克斯电气股份有限公司 | Air injection enthalpy increasing control method and device of air conditioner and air conditioner |
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| CN113203225B (en) | 2023-03-31 |
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