CN109140842A - Method and device based on degree of superheat control electric expansion valve - Google Patents
Method and device based on degree of superheat control electric expansion valve Download PDFInfo
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- CN109140842A CN109140842A CN201811045617.XA CN201811045617A CN109140842A CN 109140842 A CN109140842 A CN 109140842A CN 201811045617 A CN201811045617 A CN 201811045617A CN 109140842 A CN109140842 A CN 109140842A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012937 correction Methods 0.000 claims abstract description 89
- 238000001704 evaporation Methods 0.000 claims description 21
- 230000008020 evaporation Effects 0.000 claims description 20
- 239000003507 refrigerant Substances 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 101000969770 Homo sapiens Myelin protein zero-like protein 2 Proteins 0.000 description 2
- 102100021272 Myelin protein zero-like protein 2 Human genes 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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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- 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 embodiment of the invention provides a kind of method and devices based on degree of superheat control electric expansion valve.Wherein, which comprises the average degree of superheat is obtained according to the degree of superheat, calculates and obtain degree of superheat height mark or the low mark of the degree of superheat using the average degree of superheat；According to the degree of superheat height mark or the low mark of the degree of superheat, electric expansion valve correction value is modified, and controls the opening degree of electric expansion valve according to revised electric expansion valve correction value.Method and device provided in an embodiment of the present invention based on degree of superheat control electric expansion valve, degree of superheat height mark or the low mark of the degree of superheat are determined by the average degree of superheat, electric expansion valve correction value is modified further according to two kinds of degree of superheat marks, and then the aperture of electric expansion valve is controlled, to realize effective adjusting to temperature control device temperature.
Description
Technical Field
The embodiment of the invention relates to the technical field of temperature control, in particular to a method and a device for controlling an electronic expansion valve based on superheat degree.
Background
In the field of temperature control of the existing equipment, the temperature of the refrigeration system can be controlled within a proper range by adjusting the opening value of an electronic expansion valve of the refrigeration system, and the stable and reliable operation of the system is ensured. The refrigerating system in the prior semiconductor temperature control device adopts a constant-frequency compressor, and the output refrigerating capacity is constant. The energy of heat exchange between the evaporator and the load side (i.e., the output cooling capacity) is controlled by adjusting the opening degree of the electronic expansion valve in each temperature range to adjust the flow rate of the refrigerant. In order to ensure the constancy of the output refrigerating output, the opening degree of the electronic expansion valve is a single opening degree value in each temperature section, and the original system does not have detection and control related to the superheat degree and can not completely ensure that the system works in a normal state. Too low a superheat in the system may result in blow-back entrainment and even wet stroke damage to the compressor. To avoid this, a certain degree of suction superheat is required to ensure that only dry vapor enters the compressor (the presence of superheat, depending on the refrigerant properties, indicates complete evaporation of the liquid refrigerant). However, too high a superheat also causes the discharge temperature (discharge superheat) of the compressor to increase, and the operation condition of the compressor deteriorates and the life is reduced. Therefore, the range of the degree of superheat needs to be controlled, and the control of the degree of superheat can be mainly achieved by controlling the opening degree of the electronic expansion valve to adjust the input amount of the refrigerant. Therefore, how to effectively control the opening degree of the electronic expansion valve and further control the superheat degree of the existing temperature control equipment within a reasonable range is a problem which is widely concerned in the industry.
Disclosure of Invention
In view of the above problems in the prior art, embodiments of the present invention provide a method and an apparatus for controlling an electronic expansion valve based on a superheat degree.
In a first aspect, an embodiment of the present invention provides a method for controlling an electronic expansion valve based on a superheat degree, including:
obtaining an average superheat degree according to the superheat degree, and calculating and obtaining a high superheat degree mark or a low superheat degree mark by adopting the average superheat degree; and correcting the corrected value of the electronic expansion valve according to the high superheat degree mark or the low superheat degree mark, and controlling the opening degree of the electronic expansion valve according to the corrected value of the electronic expansion valve.
In a second aspect, an embodiment of the present invention provides an apparatus for controlling an electronic expansion valve based on a superheat degree, including:
the superheat degree high mark or superheat degree low mark acquisition module is used for acquiring an average superheat degree according to the superheat degree, and calculating and acquiring a superheat degree high mark or superheat degree low mark by adopting the average superheat degree; and the electronic expansion valve correction value module is used for correcting the correction value of the electronic expansion valve according to the high superheat degree mark or the low superheat degree mark and controlling the opening degree of the electronic expansion valve according to the corrected correction value of the electronic expansion valve.
In a third aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, and the processor invokes the program instructions to perform the method for controlling the electronic expansion valve based on superheat provided in any of the various possible implementations of the first aspect.
In a fourth aspect, embodiments of the present invention provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform a method for controlling an electronic expansion valve based on superheat provided in any of various possible implementations of the first aspect.
According to the method and the device for controlling the electronic expansion valve based on the superheat degree, provided by the embodiment of the invention, the high superheat degree mark or the low superheat degree mark is determined through the average superheat degree, and the corrected value of the electronic expansion valve is corrected according to the two superheat degree marks, so that the opening degree of the electronic expansion valve is controlled, and the temperature of the temperature control equipment is effectively adjusted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling an electronic expansion valve based on superheat according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a refrigeration apparatus provided in an embodiment of the present invention;
FIG. 3 is a flowchart of a method for obtaining superheat according to an embodiment of the invention;
FIG. 4 is a flowchart of a method for obtaining a high superheat flag according to an embodiment of the invention;
FIG. 5 is a flowchart of a method for obtaining a low superheat flag according to an embodiment of the invention;
FIG. 6 is a flowchart of a method for correcting a correction value according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an apparatus for controlling an electronic expansion valve based on superheat according to an embodiment of the present invention;
fig. 8 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
In the field of temperature control of the existing equipment, the temperature of the refrigeration system can be controlled within a proper range by adjusting the opening value of an electronic expansion valve of the refrigeration system, and the stable and reliable operation of the system is ensured. For this purpose, parameters such as suction pressure, suction temperature and evaporating temperature of the refrigeration system need to be obtained. Wherein, the suction pressure refers to the pressure of gas sucked by a temperature control device (such as a compressor), the suction temperature refers to the corresponding gas temperature, and the evaporation temperature refers to the gas temperature at the outlet of the evaporator.
The refrigerating system in the prior semiconductor temperature control device adopts a constant-frequency compressor, and the output refrigerating capacity is constant. The energy of heat exchange between the evaporator and the load side (i.e., the output cooling capacity) is controlled by adjusting the opening degree of the electronic expansion valve in each temperature range to adjust the flow rate of the refrigerant. In order to ensure that the refrigerating output can be constant, the opening degree of the electronic expansion valve is a fixed opening degree value in each temperature section, and the original system does not have detection and control related to superheat degree, so that the system can not be completely ensured to work in a normal state (for example, the equipment cannot normally run due to overhigh or overlow working temperature). Too low a superheat in the system may result in blow-back entrainment and even wet stroke damage to the compressor. To avoid this, a certain degree of suction superheat is required to ensure that only dry vapor enters the compressor (the presence of superheat, depending on the refrigerant properties, indicates complete evaporation of the liquid refrigerant). However, too high a superheat also causes the discharge temperature (discharge superheat) of the compressor to increase, and the operation condition of the compressor deteriorates and the life is reduced. Therefore, the range of superheat needs to be controlled to reduce the negative impact that the over-or under-temperature may have on the equipment.
In view of the above situation, an embodiment of the present invention provides a method for controlling an electronic expansion valve based on a superheat degree, and referring to fig. 1, the method includes: 101. obtaining an average superheat degree according to the superheat degree in a preset time period, and comparing the average superheat degree with a superheat degree comparison value to determine a superheat degree high mark or a superheat degree low mark; 102. and correcting the corrected value of the electronic expansion valve according to the high superheat degree mark or the low superheat degree mark, and controlling the opening degree of the electronic expansion valve according to the corrected value of the electronic expansion valve. The preset time period is an arbitrarily set time period, for example, 20 seconds. The superheat degree comparison value is a value which can be compared with the average superheat degree and determines a high superheat degree mark or a low superheat degree mark according to the comparison result, and the superheat degree comparison value can comprise: a high superheat limit value, a high superheat correction value, a low superheat limit value, and a low superheat correction value.
In step 101, the superheat degree is the difference between the superheat temperature and the saturation temperature of the refrigerant at the same evaporation pressure in the temperature control cycle. For example, in terms of the properties of water and steam, the degree of superheat refers to the degree to which the temperature of the steam is higher than the saturation temperature at the corresponding pressure. For water and steam, the saturation curve is a rising curve on the steam diagram, i.e. as the pressure rises, the saturation temperature of the water also rises. Similarly, when the water vapor is already in a superheated state, if the pressure is increased, the corresponding saturation temperature is increased, and the degree that the temperature is higher than the saturation temperature is also decreased, that is, the degree of superheat of the steam is decreased. The average superheat refers to the arithmetic mean of all superheat values counted over a certain period of time (e.g., 20 s). The high superheat sign refers to the duration of the average superheat within a higher range than the high superheat limit value and the high superheat correction value, and the high superheat sign can be set after the duration exceeds a certain threshold. Similarly, the low superheat flag indicates the time during which the average superheat is maintained in a lower range than the low superheat limit value and the low superheat correction value, and when the time exceeds a predetermined threshold, it is determined that the current multi-superheat low flag is present.
In step 102, the electronic expansion valve is mainly corrected by adjusting the correction value (i.e., the correction coefficient), and in the solution of this embodiment of the present invention, how to determine the correction value is first determined by determining the high superheat flag or the low superheat flag. Specifically, when the mark is determined to be a high superheat degree mark, the adjustment correction value has the effect of mainly changing the opening degree of the electronic expansion valve so as to relatively reduce the superheat degree; accordingly, when the low superheat flag is determined, the adjustment of the correction value has the effect of mainly changing the opening degree of the electronic expansion valve so that the superheat value relatively increases. Finally, the opening degree of the electronic expansion valve is adjusted, so that the superheat degree is controlled within a reasonable range.
According to the method embodiment provided by the invention, the high superheat degree mark or the low superheat degree mark is determined through the average superheat degree, and the corrected value of the electronic expansion valve is corrected according to the two superheat degree marks, so that the opening degree of the electronic expansion valve is controlled, and the temperature of the temperature control equipment is effectively adjusted.
In the above embodiment, the degree of superheat is the basis for determining the average degree of superheat, and thus the high degree of superheat flag or the low degree of superheat flag. Therefore, in order to make the technical solution of the embodiment of the present invention clearer, a detailed description of how to obtain the degree of superheat should be made. For this reason, based on the content of the above embodiment, as an alternative embodiment, the obtaining of the degree of superheat includes: obtaining an average evaporation temperature according to the average suction pressure and a refrigerant parameter table; and obtaining the evaporation temperature and the suction temperature, comparing the evaporation temperature with the suction temperature, taking a smaller value, and subtracting the average evaporation temperature from the smaller value to obtain the superheat degree. Specifically, referring to fig. 2, in fig. 2, hardware of the whole system mainly includes a compressor COMP1, a condenser CON1, an electronic expansion valve EEV1, an evaporator EVA1, a temperature sensor TS104, a temperature sensor TS105, an intake pressure sensor P12, and an evaporation pressure sensor P13. The left PCW circuit of fig. 2 is the working side, and the right PCW circuit is the load side. The compressor COMP1 is responsible for applying work to the refrigerant R404A, the high-temperature and high-pressure refrigerant is condensed at the side of the condenser CON1 to release heat, is throttled by the electronic expansion valve EEV1, is evaporated and absorbs heat in the evaporator EVA1, enters the air suction port of the compressor COMP1 after coming out of the evaporator, and circulates to and fro through phase change refrigeration. Wherein, P12 is a suction pressure sensor, and the suction pressure of the refrigerant is obtained through acquisition and calculation of the PLC. The corresponding distillation temperature was obtained by TS105 and the suction temperature by TS 104. And collecting suction pressure, averaging the suction pressure, correspondingly obtaining the saturated evaporation temperature of the refrigerant R404A, and calculating to obtain the superheat degree. In this embodiment, referring to fig. 3, in fig. 3, the suction pressure is collected every 1S, the average value (i.e., the suction pressure average value) in the latest 20S is continuously collected, and then the average evaporation temperature T can be obtained by referring to the parameter table of the refrigerant R404A according to the suction pressure average value. The boil-off temperature determined in FIG. 2 was compared with the suction temperature, and the smaller of the two was taken as T1, and finally T1-T gave the degree of superheat.
After the degree of superheat is obtained, a high degree of superheat flag and a low degree of superheat flag should be further obtained on the basis of this. First, how to further obtain the high superheat flag is discussed, and for this purpose, based on the contents of the above embodiment, as an alternative embodiment, the superheat comparison value includes a high superheat limit value and a high superheat correction value; accordingly, determining a high superheat flag by comparing the average superheat with a superheat comparison value includes: comparing the average superheat degree with a superheat degree high limit value and a superheat degree high correction value, and calculating the time displayed by a high timer according to the comparison result; if the time displayed by the high timer exceeds a superheat degree high limit threshold (for example, 10s), acquiring a superheat degree high mark; wherein the superheat degree high limit value is smaller than the superheat degree high correction value. Further, as an alternative embodiment, the comparing the average degree of superheat with the high limit value of the degree of superheat and the high correction value of the degree of superheat, and calculating the time displayed by the high timer according to the comparison result includes: if the average superheat degree is less than or equal to the superheat degree high limit value, the time displayed by the high timer is zero; if the average superheat degree is larger than the superheat degree high limit value and smaller than or equal to the superheat degree high correction value, the time displayed by the high timer is reduced by 1; and if the average superheat degree is larger than the superheat degree high correction value, adding 1 to the time displayed by the high timer. It should be noted that if the duration of the average superheat is longer than the superheat high correction value (this time is indicated by the high timer and can be understood as the trend of the superheat) exceeds a certain time threshold, it can be determined that the superheat is currently high. To further describe the technical solution in this embodiment of the present invention in detail, please refer to fig. 4, it can be seen from fig. 4 that the power-on time of the temperature control device is set to be greater than 10s (i.e. the power-on time of the temperature control device at least exceeds 10s), and the high timer is initially set to zero (i.e. H ═ 0). The superheat degree is collected every 1s, and then the average value of the superheat degree in the last 20s is obtained to obtain the average superheat degree M. If M is less than or equal to the high limit value of the superheat degree, H is 0; if the limit value of the superheat degree is less than M and M is less than or equal to the correction value of the superheat degree, H is H-1; if M is greater than the superheat high correction value, H is H + 1. And when the H is more than 10s (namely the high limit threshold of the superheat degree), triggering a high-superheat-degree flag bit to obtain a high-superheat-degree flag. It should be noted that the high timer in this embodiment is assigned with time (i.e., 1s), and all assignment actions (i.e., H ═ 0, H ═ H-1, or H ═ H +1) are 1s actions.
Next, how to further obtain the low superheat flag is discussed, and for this purpose, based on the contents of the foregoing embodiment, as an alternative embodiment, the superheat comparison value includes a low superheat limit value and a low superheat correction value; accordingly, determining a low superheat flag by comparing the average degree of superheat with a degree of superheat comparison value includes: comparing the average superheat degree with a superheat degree low limit value and a superheat degree low correction value, and calculating the time displayed by a low timer according to the comparison result; if the time displayed by the low timer exceeds a superheat degree low limit threshold (for example, 30s), acquiring a superheat degree low mark; wherein the low superheat limit value is larger than the low superheat correction value. Further, as an alternative embodiment, the comparing the average superheat degree with the superheat degree low limit value and the superheat degree low correction value, and calculating the time displayed by the low timer according to the comparison result includes: if the average superheat degree is less than or equal to the superheat degree low correction value, adding 1 to the time displayed by the low timer; if the average superheat degree is larger than the superheat degree low correction value and is smaller than or equal to the superheat degree low limit value, the time displayed by the low timer is reduced by 1; and if the average superheat degree is larger than the superheat degree low limit value, the time displayed by the low timer is zero. It should be noted that if the duration of the average superheat degree smaller than the superheat degree low correction value (this time is indicated by a low timer and can be understood as the tendency of the superheat degree to develop) exceeds a certain time threshold, it can be determined that the superheat degree is currently low. To further describe the technical solution of the embodiment of the present invention in detail, please refer to fig. 5, it can be seen from fig. 5 that the boot time is set to be greater than 10s, and the low timer is initially set to zero (i.e. K equals to 0). The superheat degree is collected every 1s, and then the average value of the superheat degree in the last 20s is obtained to obtain the average superheat degree M. If M is less than or equal to the low superheat correction value, K is equal to K + 1; if the superheat degree low correction value is less than M and M is less than or equal to the superheat degree low limit value, K is equal to K-1; if M is greater than the superheat degree low limit value, K is 0. And when K is larger than 30s (namely the superheat degree low limit threshold), triggering a superheat degree low flag bit to obtain a superheat degree low flag. It should be noted that the high timer in this embodiment is assigned with time (i.e., 1s), and all assignment actions (i.e., K ═ 0, K ═ K-1, or K ═ K +1) are 1s actions.
After the superheat degree low mark or the superheat degree high mark is obtained, the opening degree of the electronic expansion valve can be corrected accordingly, and control over the electronic expansion valve is achieved. Here, the correction of the opening degree of the electronic expansion valve is realized by adjusting a correction value, and based on the above embodiment, as an alternative embodiment, the correcting of the correction value of the electronic expansion valve according to the high superheat degree flag or the low superheat degree flag includes: for the mark of low superheat degree, adding 1 to the corrected value of the electronic expansion valve; and for the high superheat mark, subtracting 1 from the corrected value of the electronic expansion valve. In order to clearly and intuitively show the technical scheme of the embodiment, the scheme of the embodiment is explained by referring to fig. 6, and referring to fig. 6, a superheat degree action flag is introduced, and the startup time is still set to be greater than 10s every 40s of actions. The correction value is increased or decreased according to the degree of superheat, which is represented as follows: when the low superheat degree mark is detected, the correction value is equal to a correction value +1 (namely the current correction value is added by 1); when the high superheat flag is detected, the correction value is equal to the correction value-1 (i.e., the current correction value is decremented by 1). Meanwhile, after the compressor is turned on (the compressor represents a temperature control device), the initial correction value is 100, and the correction range is limited to be greater than or equal to 30 and less than or equal to 150. And correcting the correction value according to the low superheat degree mark or the high superheat degree mark to correspondingly obtain a correction coefficient (namely, a correction value) of the electronic expansion valve. In the system, the basic opening degree value of the expansion valve is given through the refrigerating capacity, and the final output value of the opening degree of the expansion valve is obtained by correspondingly multiplying the basic opening degree value by a correction coefficient (namely a correction value), so that the superheat degree is ensured to be in a proper range.
The implementation basis of the various embodiments of the present invention is realized by programmed processing performed by a device having a processor function. Therefore, in engineering practice, the technical solutions and functions thereof of the embodiments of the present invention can be packaged into various modules. Based on this reality, on the basis of the above embodiments, embodiments of the present invention provide an apparatus for controlling an electronic expansion valve based on a degree of superheat, which is used to execute a method for controlling an electronic expansion valve based on a degree of superheat in the above method embodiments. Referring to fig. 7, the apparatus 703 for controlling an electronic expansion valve based on a superheat degree includes:
the superheat degree high mark or superheat degree low mark obtaining module 701 is used for obtaining an average superheat degree according to the superheat degree in a preset time period, and comparing the average superheat degree with a superheat degree comparison value to determine a superheat degree high mark or a superheat degree low mark;
and the electronic expansion valve correction value module 702 is used for correcting the correction value of the electronic expansion valve according to the high superheat degree mark or the low superheat degree mark, and controlling the opening degree of the electronic expansion valve according to the corrected correction value of the electronic expansion valve.
For the function realized by the high superheat flag or the low superheat flag obtaining module 701, the superheat refers to the difference between the superheat temperature and the saturation temperature of the refrigerant at the same evaporation pressure in the temperature control cycle. For example, in terms of the properties of water and steam, the degree of superheat refers to the degree to which the temperature of the steam is higher than the saturation temperature at the corresponding pressure. For water and steam, the saturation curve is a rising curve on the steam diagram, i.e. as the pressure rises, the saturation temperature of the water also rises. Similarly, when the water vapor is already in a superheated state, if the pressure is increased, the corresponding saturation temperature is increased, and the degree that the temperature is higher than the saturation temperature is also decreased, that is, the degree of superheat of the steam is decreased. The average superheat refers to the arithmetic mean of all superheat values counted over a period of time. The high superheat sign refers to the time that the average superheat is in a higher range compared with a high superheat limit value and a high superheat correction value, and the current multi-superheat sign can be judged after the time exceeds a certain threshold value. Similarly, the low superheat flag indicates the time during which the average superheat is maintained in a lower range than the low superheat limit value and the low superheat correction value, and when the time exceeds a predetermined threshold, it is determined that the current multi-superheat low flag is present.
For the function realized by the electronic expansion valve correction value module 702, the correction of the electronic expansion valve is mainly realized by adjusting the correction value (i.e., the correction coefficient). Specifically, when the mark is determined to be a high superheat degree mark, the adjustment correction value has the effect of mainly changing the opening degree of the electronic expansion valve so as to relatively reduce the superheat degree; accordingly, when the low superheat flag is determined, the adjustment of the correction value has the effect of mainly changing the opening degree of the electronic expansion valve so that the superheat value relatively increases. Finally, the opening degree of the electronic expansion valve is adjusted, so that the superheat degree is controlled within a reasonable range.
According to the device embodiment provided by the invention, the high superheat sign or the low superheat sign is determined according to the average superheat degree by adopting the high superheat degree sign or the low superheat degree sign acquisition module 701, and the corrected value of the electronic expansion valve is corrected according to two superheat degree signs by adopting the corrected value module 702 of the electronic expansion valve, so that the opening degree of the electronic expansion valve is controlled, and the temperature of the temperature control equipment is effectively regulated.
On the basis of the foregoing embodiment, as an optional embodiment, the module for acquiring the high superheat flag or the low superheat flag in the device for controlling an electronic expansion valve based on superheat provided by the present invention further includes:
the superheat degree acquisition module is used for acquiring the average evaporation temperature according to the average suction pressure and the refrigerant parameter table; and obtaining the evaporation temperature and the suction temperature, comparing the evaporation temperature with the suction temperature, taking a smaller value, and subtracting the average evaporation temperature from the smaller value to obtain the superheat degree.
On the basis of the above embodiment, as an alternative embodiment, the embodiment of the present invention provides a high superheat flag determining module, where the high superheat flag determining module is configured to compare the average superheat with a high superheat limit value and a high superheat correction value, and calculate a time displayed by a high timer according to a comparison result; if the time displayed by the high timer exceeds the superheat degree high limit threshold, acquiring a superheat degree high mark; wherein the superheat degree high limit value is smaller than the superheat degree high correction value.
On the basis of the foregoing embodiment, as an alternative embodiment, an embodiment of the present invention provides a high timer display time resetting module, where the high timer display time resetting module is configured to set a time displayed by the high timer to zero when the average superheat degree is less than or equal to the superheat degree high limit value; if the average superheat degree is larger than the superheat degree high limit value and smaller than or equal to the superheat degree high correction value, the time displayed by the high timer is reduced by 1; and if the average superheat degree is larger than the superheat degree high correction value, adding 1 to the time displayed by the high timer.
On the basis of the above embodiment, as an alternative embodiment, the embodiment of the present invention provides a low superheat flag obtaining module, where the low superheat flag obtaining module is configured to compare the average superheat with a low superheat limit value and a low superheat correction value, and calculate a time displayed by a low timer according to a comparison result; if the time displayed by the low timer exceeds the superheat degree low limit threshold, acquiring a superheat degree low mark; wherein the low superheat limit value is larger than the low superheat correction value.
On the basis of the foregoing embodiment, as an alternative embodiment, an embodiment of the present invention provides a low timer display time resetting module, where the low timer display time resetting module is configured to add 1 to the time displayed by the low timer when the average superheat degree is less than or equal to the superheat degree low correction value; if the average superheat degree is larger than the superheat degree low correction value and is smaller than or equal to the superheat degree low limit value, the time displayed by the low timer is reduced by 1; and if the average superheat degree is larger than the superheat degree low limit value, the time displayed by the low timer is zero.
On the basis of the above embodiment, as an optional embodiment, an embodiment of the present invention provides an electronic expansion valve correction value module, where the electronic expansion valve correction value module is configured to add 1 to the electronic expansion valve correction value when a mark with a low superheat degree is obtained; and for the high superheat mark, subtracting 1 from the corrected value of the electronic expansion valve.
The method of the embodiment of the invention is realized by depending on the electronic equipment, so that the related electronic equipment is necessarily introduced. To this end, an embodiment of the present invention provides an electronic apparatus, as shown in fig. 8, including: at least one processor (processor)801, a communication Interface (Communications Interface)804, at least one memory (memory)802, and a communication bus 803, wherein the at least one processor 801, the communication Interface 804, and the at least one memory 802 communicate with each other via the communication bus 803. The at least one processor 801 may invoke logic instructions in the at least one memory 802 to perform the following method: obtaining an average superheat degree according to the superheat degree in a preset time period, and comparing the average superheat degree with a superheat degree comparison value to determine a superheat degree high mark or a superheat degree low mark; and correcting the corrected value of the electronic expansion valve according to the high superheat degree mark or the low superheat degree mark, and controlling the opening degree of the electronic expansion valve according to the corrected value of the electronic expansion valve.
Furthermore, the logic instructions in the at least one memory 802 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. Examples include: obtaining an average superheat degree according to the superheat degree in a preset time period, and comparing the average superheat degree with a superheat degree comparison value to determine a superheat degree high mark or a superheat degree low mark; and correcting the corrected value of the electronic expansion valve according to the high superheat degree mark or the low superheat degree mark, and controlling the opening degree of the electronic expansion valve according to the corrected value of the electronic expansion valve. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of controlling an electronic expansion valve based on superheat, comprising:
obtaining an average superheat degree according to the superheat degree in a preset time period, and comparing the average superheat degree with a superheat degree comparison value to determine a superheat degree high mark or a superheat degree low mark;
and correcting the corrected value of the electronic expansion valve according to the high superheat degree mark or the low superheat degree mark, and controlling the opening degree of the electronic expansion valve according to the corrected value of the electronic expansion valve.
2. The method of claim 1, wherein the obtaining of the degree of superheat comprises:
obtaining an average evaporation temperature according to the average suction pressure and a refrigerant parameter table;
and obtaining the evaporation temperature and the suction temperature, comparing the evaporation temperature with the suction temperature, taking a smaller value, and subtracting the average evaporation temperature from the smaller value to obtain the superheat degree.
3. The method of claim 1 wherein the superheat comparison value comprises a superheat high limit value and a superheat high correction value; accordingly, the determining the high superheat flag by comparing the average superheat with a superheat comparison value includes:
comparing the average superheat degree with a superheat degree high limit value and a superheat degree high correction value, and calculating the time displayed by a high timer according to the comparison result;
if the time displayed by the high timer exceeds the high superheat degree limit threshold, determining a high superheat degree mark;
wherein the superheat degree high limit value is smaller than the superheat degree high correction value.
4. The method of claim 1 wherein comparing the average superheat to a superheat high limit and a superheat high correction and calculating the time indicated by the high timer based on the comparison comprises:
if the average superheat degree is less than or equal to the superheat degree high limit value, the time displayed by the high timer is zero;
if the average superheat degree is larger than the superheat degree high limit value and smaller than or equal to the superheat degree high correction value, the time displayed by the high timer is reduced by 1;
and if the average superheat degree is larger than the superheat degree high correction value, adding 1 to the time displayed by the high timer.
5. The method of claim 1 wherein the superheat comparison value comprises a low superheat limit value and a low superheat correction value; accordingly, the determining the low superheat flag by comparing the average superheat with a superheat comparison value includes:
comparing the average superheat degree with a superheat degree low limit value and a superheat degree low correction value, and calculating the time displayed by a low timer according to the comparison result;
if the time displayed by the low timer exceeds the superheat degree low limit threshold, determining a superheat degree low mark;
wherein the low superheat limit value is larger than the low superheat correction value.
6. The method of claim 1 wherein comparing the average superheat to a low superheat limit and a low superheat correction and calculating the time indicated by a low timer based on the comparison comprises:
if the average superheat degree is less than or equal to the superheat degree low correction value, adding 1 to the time displayed by the low timer;
if the average superheat degree is larger than the superheat degree low correction value and is smaller than or equal to the superheat degree low limit value, the time displayed by the low timer is reduced by 1;
and if the average superheat degree is larger than the superheat degree low limit value, the time displayed by the low timer is zero.
7. The method of claim 1, wherein said modifying the electronic expansion valve correction based on the high superheat flag or the low superheat flag comprises:
for the mark of low superheat degree, adding 1 to the corrected value of the electronic expansion valve;
and for the high superheat mark, subtracting 1 from the corrected value of the electronic expansion valve.
8. An apparatus for controlling an electronic expansion valve based on superheat, comprising:
the superheat degree high mark or superheat degree low mark acquisition module is used for acquiring an average superheat degree according to the superheat degree in a preset time period, and determining a superheat degree high mark or superheat degree low mark by comparing the average superheat degree with a superheat degree comparison value;
and the electronic expansion valve correction value module is used for correcting the correction value of the electronic expansion valve according to the high superheat degree mark or the low superheat degree mark and controlling the opening degree of the electronic expansion valve according to the corrected correction value of the electronic expansion valve.
9. An electronic device, comprising:
at least one processor, at least one memory, a communication interface, and a bus; wherein,
the processor, the memory and the communication interface complete mutual communication through the bus;
the memory stores program instructions executable by the processor, the processor calling the program instructions to perform the product display method of any one of claims 1 to 7.
10. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the product presentation method of any one of claims 1 to 7.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110762729A (en) * | 2019-09-23 | 2020-02-07 | 宁波奥克斯电气股份有限公司 | Method for controlling air conditioner and air conditioner |
| CN111522324A (en) * | 2020-04-08 | 2020-08-11 | 北京京仪自动化装备技术有限公司 | Method and device for testing semiconductor temperature control device, electronic equipment and storage medium |
| CN111562801A (en) * | 2020-07-14 | 2020-08-21 | 北京京仪自动化装备技术有限公司 | Circulating liquid temperature adjusting method, circulating liquid temperature adjusting control device and circulating liquid temperature adjusting control system |
| CN112856845A (en) * | 2021-01-25 | 2021-05-28 | 北京京仪自动化装备技术有限公司 | Wide-temperature-range temperature control device and control method thereof |
| CN112965547A (en) * | 2021-02-09 | 2021-06-15 | 北京京仪自动化装备技术有限公司 | Temperature control system and temperature control method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1089803A1 (en) * | 1998-05-26 | 2001-04-11 | Atlas Copco Airpower N.V. | Method and device for cool-drying |
| CN1705852A (en) * | 2003-07-01 | 2005-12-07 | 松下电器产业株式会社 | Expansion valve control method for multi-system air conditioner |
| CN104729173A (en) * | 2013-12-23 | 2015-06-24 | 珠海格力电器股份有限公司 | Superheat degree control method and device for condensing unit |
| CN107606830A (en) * | 2017-09-05 | 2018-01-19 | 浙江正理生能科技有限公司 | A kind of electric expansion valve adjusting method |
| CN107990609A (en) * | 2017-11-20 | 2018-05-04 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve and refrigerant circulating system |
| CN108088041A (en) * | 2017-12-06 | 2018-05-29 | 广东美的制冷设备有限公司 | Control method, radiation air-conditioner and the storage medium of electric expansion valve |
-
2018
- 2018-09-07 CN CN201811045617.XA patent/CN109140842B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1089803A1 (en) * | 1998-05-26 | 2001-04-11 | Atlas Copco Airpower N.V. | Method and device for cool-drying |
| CN1705852A (en) * | 2003-07-01 | 2005-12-07 | 松下电器产业株式会社 | Expansion valve control method for multi-system air conditioner |
| CN104729173A (en) * | 2013-12-23 | 2015-06-24 | 珠海格力电器股份有限公司 | Superheat degree control method and device for condensing unit |
| CN107606830A (en) * | 2017-09-05 | 2018-01-19 | 浙江正理生能科技有限公司 | A kind of electric expansion valve adjusting method |
| CN107990609A (en) * | 2017-11-20 | 2018-05-04 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve and refrigerant circulating system |
| CN108088041A (en) * | 2017-12-06 | 2018-05-29 | 广东美的制冷设备有限公司 | Control method, radiation air-conditioner and the storage medium of electric expansion valve |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110762729A (en) * | 2019-09-23 | 2020-02-07 | 宁波奥克斯电气股份有限公司 | Method for controlling air conditioner and air conditioner |
| CN111522324A (en) * | 2020-04-08 | 2020-08-11 | 北京京仪自动化装备技术有限公司 | Method and device for testing semiconductor temperature control device, electronic equipment and storage medium |
| CN111522324B (en) * | 2020-04-08 | 2021-06-22 | 北京京仪自动化装备技术股份有限公司 | Method and device for testing semiconductor temperature control device, electronic equipment and storage medium |
| CN111562801A (en) * | 2020-07-14 | 2020-08-21 | 北京京仪自动化装备技术有限公司 | Circulating liquid temperature adjusting method, circulating liquid temperature adjusting control device and circulating liquid temperature adjusting control system |
| CN112856845A (en) * | 2021-01-25 | 2021-05-28 | 北京京仪自动化装备技术有限公司 | Wide-temperature-range temperature control device and control method thereof |
| CN112965547A (en) * | 2021-02-09 | 2021-06-15 | 北京京仪自动化装备技术有限公司 | Temperature control system and temperature control method |
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