CN110017634B - Control method of electronic expansion valve - Google Patents
Control method of electronic expansion valve Download PDFInfo
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- CN110017634B CN110017634B CN201810015905.4A CN201810015905A CN110017634B CN 110017634 B CN110017634 B CN 110017634B CN 201810015905 A CN201810015905 A CN 201810015905A CN 110017634 B CN110017634 B CN 110017634B
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- superheat
- expansion valve
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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
- 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
- F25B2700/21—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)
- Magnetically Actuated Valves (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method of an electronic expansion valve, which comprises the following steps: 10) pre-storing a target superheat degree T of the electronic expansion valve; 20) acquiring the current superheat Tsh of the electronic expansion valve, and calculating a superheat difference delta Tsh between the current superheat Tsh and the target superheat T, wherein the absolute value of the superheat difference delta Tsh is superheat deviation | delta Tsh |; 30) controlling the electronic expansion valve to have different opening degrees according to the superheat degree deviation | Δ Tsh |. Therefore, in the control method of the electronic expansion valve, the opening degree of the electronic expansion valve can be adjusted in real time according to the current superheat degree deviation | delta Tsh | of the refrigeration system, so that the refrigeration system keeps the optimal refrigerant flow, the parameters of the refrigeration system are in the optimal state, and the stability and the performance of the system are improved.
Description
Technical Field
The invention relates to the technical field of refrigeration control, in particular to a control method of an electronic expansion valve.
Background
In the existing refrigerating system of the refrigerator, a thermal expansion valve is mostly adopted as a throttling device. The thermostatic expansion valve adjusts the flow of the refrigerant mainly by sensing the superheat degree of the refrigerant steam at the outlet of the evaporator so as to maintain the constant superheat degree of the system.
Although the thermostatic expansion valve can automatically adjust the flow of the refrigerant, the thermostatic expansion valve has significant disadvantages, such as long delay time corresponding to the degree of superheat, limited adjustment range, and low adjustment precision, thereby causing adverse effects on the economy and safety of the refrigeration system.
In view of the above, how to provide a control method for an electronic expansion valve,
disclosure of Invention
In order to solve the above technical problem, an object of the present invention is to provide a control method of an electronic expansion valve, including the following steps:
10) pre-storing a target superheat degree T of the electronic expansion valve;
20) acquiring the current superheat Tsh of the electronic expansion valve, and calculating a superheat difference delta Tsh between the current superheat Tsh and the target superheat T, wherein the absolute value of the superheat difference delta Tsh is superheat deviation
；
30) According to the superheat deviation
Controlling the electronic expansion valve to have different opening degrees;
in the step 10), a stable threshold value B of the electronic expansion valve is also prestored;
in step 30), the superheat degree deviation is compared
And the stable threshold value B, if the | delta Tsh | is more than or equal to B, entering the step 140), otherwise, entering the step 150):
140) calculating the current action amount of the electronic expansion valve according to the following formula (1)
；
150) Calculating the current action amount of the electronic expansion valve according to the following formula (2)
；
Wherein:
the current action quantity of the electronic expansion valve is obtained;
p, I, D are known coefficients;
k is the monitoring times;
wherein the content of the first and second substances,
is a correction value of coefficient I and satisfies 0<λ<1。
Therefore, in the control method of the electronic expansion valve, the deviation of the current superheat degree of the refrigeration system can be determined
The opening degree of the electronic expansion valve is adjusted in real time, so that the refrigeration system keeps the optimal refrigerant flow, the parameters of the refrigeration system are in the optimal state, and the stability and the performance of the system are improved.
Optionally, the correction value
As said degree of superheat deviation
Or a function of the current degree of superheat Tsh.
Optionally, the correction value
Deviation from the stable threshold value B and the superheat degree
The following relationship is satisfied:
optionally, in step 10), a control cycle of the electronic expansion valve is prestored, and the working performance of the electronic expansion valve is stable in each control cycle;
step 140) or 150), the next said control cycle is entered and returns to step 20).
Alternatively, in formula (1), the coefficient D = 0.
Drawings
Fig. 1 is a flow chart of a control method of an electronic expansion valve according to the present invention in a first embodiment;
fig. 2 is a flow chart of a control method of the electronic expansion valve in a second embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1-2, fig. 1 is a flow chart illustrating a control method of an electronic expansion valve according to a first embodiment of the present invention; fig. 2 is a flow chart of a control method of the electronic expansion valve in a second embodiment of the invention.
In one embodiment, the present invention provides a control method of an electronic expansion valve, as shown in fig. 1, the control method including the steps of:
s10: pre-storing a target superheat degree T of the electronic expansion valve;
s20: acquiring the current superheat Tsh of the electronic expansion valve, and calculating the superheat difference delta Tsh between the current superheat Tsh and the target superheat T, wherein the absolute value of the superheat difference delta Tsh is superheat deviation
；
S30: according to the deviation of superheat degree
The electronic expansion valve is controlled to have different opening degrees.
Therefore, in the control method of the electronic expansion valve, the deviation of the current superheat degree of the refrigeration system can be determined
The opening degree of the electronic expansion valve is adjusted in real time, so that the refrigeration system keeps the optimal refrigerant flow, the parameters of the refrigeration system are in the optimal state, and the stability and the performance of the system are improved.
When the refrigeration systems are different, the target superheat degree T of the electronic expansion valve is also different, in addition, the current superheat degree Tsh can be calculated according to the temperature difference between the intermediate temperature of the evaporator and the air suction port of the air suction pipe of the compressor, and the difference value between the target superheat degree T and the current superheat degree Tsh is calculated to serve as the current superheat degree difference value delta Tsh. Therefore, in the invention, the current superheat Tsh is gradually close to the target superheat T mainly by adjusting the opening of the electronic expansion valve until the electronic expansion valve is in the optimal opening.
Specifically, in step S30, the current operation amount Δ E of the electronic expansion valve corresponding to the current superheat degree T is calculated according to the formula (1):
wherein the content of the first and second substances,
the current action quantity of the electronic expansion valve;
is the difference value of the degree of superheat delta Tsh,
；
for the change of the superheat difference value deltatsh of two adjacent measurements,
；
for the change of the superheat difference value deltatsh in the previous cycle,
. P, I, D is a known coefficient and k is the number of monitoring.
The above equation (1) is a basic equation of proportional-integral-derivative regulation (PID), P is a coefficient of a proportional regulation part, I is a coefficient of an integral regulation part, and D is a coefficient of a derivative regulation part. The current action amount delta E of the electronic expansion valve can be obtained according to the formula, and PID adjustment is a negative feedback adjustment process, so that the electronic expansion valve has the advantages of simple principle, convenience in use and strong applicability.
Therefore, in this embodiment, by introducing PID adjustment, the adjustment accuracy of the opening degree of the electronic expansion valve can be improved, and the rapid stabilization of the refrigeration system can be promoted.
It can be understood that the adjustment of the superheat degree of the refrigeration system requires a stabilization process, and therefore, the stabilization parameter of the refrigeration system is not a parameter corresponding to the current opening degree of the electronic expansion valve, that is, the formation of the refrigeration stable state lags behind the adjustment of the opening degree of the electronic expansion valve, and therefore, even if the current opening degree of the electronic expansion valve meets the current superheat degree requirement, due to the influence of the hysteresis, the control system still adjusts the opening degree of the electronic expansion valve according to the monitored and calculated superheat degree difference Δ Tsh, so that the electronic expansion valve has large oscillation in the adjustment process, and cannot be stabilized at the target superheat degree T, which results in the long superheat degree stabilization time, the prolonged oscillation, and the performance influence of the refrigeration system.
In addition, the degree of superheat during the start-up phase of the refrigeration systemAbsolute value of difference Δ Tsh
The superheat degree deviation is large, and when the superheat degree does not reach the set target superheat degree T for a long time, the generated superheat degree deviation is adjusted
A large accumulation value will be formed and the electronic expansion valve opening will increase due to the accumulation effect. When the opening of the electronic expansion valve reaches or exceeds the limit value thereof, the opening of the electronic expansion valve enters a saturation region and does not act further with the input action amount delta E, and when the superheat degree deviation is reversed
In the process, the output opening control quantity of the controller needs a long time to exit the saturation region, and the electronic expansion valve stays at the limit position in the time and loses control temporarily, so that the performance of the refrigeration system is deteriorated, and the time for achieving stability is greatly prolonged.
Based on this, as shown in fig. 2, in step S10, the control device of the electronic expansion valve prestores a stable threshold B of the electronic expansion valve in addition to the target superheat T, where the stable threshold B is a value corresponding to a difference in superheat when the current superheat Tsh approaches the target superheat T, and within the range of the stable threshold B, the refrigeration system is in a stable state, that is, the stable threshold B can represent that the electronic expansion valve is in an optimal opening degree.
Meanwhile, as shown in fig. 2, in the above step S30, the superheat degree deviation is compared
And (4) with the stable threshold value B, if the | delta Tsh | is more than or equal to B, the step S140 is executed, otherwise, the step S150 is executed.
S140: calculating the current action amount delta E of the electronic expansion valve according to the formula (1);
s150: calculating the current action amount delta E of the electronic expansion valve according to the following formula (2);
wherein the content of the first and second substances,
is a correction value of coefficient I and satisfies 0<λ<1。
In this embodiment, when
In this case, the distance (superheat deviation) between the current superheat Tsh and the target superheat T is small, that is, the current superheat Tsh is within the range of the stable threshold value B, and at this time, the current operation amount Δ E of the electronic expansion valve corresponding to the current superheat Tsh may be directly calculated according to the above equation (2). When in use
At this time, the distance (superheat deviation) between the current superheat Tsh and the target superheat T is large, that is, the current superheat Tsh is out of the range of the stable threshold value B, and at this time, the current operation amount Δ E of the electronic expansion valve corresponding to the current superheat Tsh may be calculated according to the above equation (1).
Obviously, | Δ Tsh<At time B, the coefficient of integral part in the calculation formula of the current action quantity delta E of the electronic expansion valve
Is a corrected value, and when the corrected coefficient is smaller than |. DELTA.Tsh |. or larger than B, the coefficient I of the integral part, i.e. λ | I<I. Therefore, in the present invention, when the superheat degree deviation is small (
) When the superheat deviation is large (a), the integration coefficient is small, the integration speed is high, and
) And the integral coefficient is larger and is slowed down, so that overshoot of the integral link generated in the process of regulating the opening of the electronic expansion valve by adopting the PID can be prevented, oscillation of the refrigeration system in the process of regulating is reduced, the stabilization time of the refrigeration system is further shortened, the influence of the hysteresis of the system in the regulating process is eliminated, and the control precision is improved.
Therefore, in the adjusting process of the opening of the electronic expansion valve in the embodiment, the influence of a hysteresis phenomenon on the adjusting process can be avoided, the oscillation of the adjusting process of the electronic expansion valve is small, the stabilization time is short, the electronic expansion valve can be prevented from stopping at the limit position and losing control in the starting stage of the refrigeration system, and the electronic expansion valve can work normally.
Specifically, the correction value
Is a deviation of superheat degree
Or a function of the current degree of superheat T.
Therefore, in this embodiment, when | Δ Tsh | < B, the coefficient of the integral part in the formula (2) is not a constant value smaller than I, but changes with the change of the superheat difference Δ Tsh or the current superheat T, and at this time, the corresponding value of the current operation amount Δ E is made more accurate, thereby further reducing the time required for the electronic expansion valve to reach the steady state.
More specifically, the correction value
Deviation from stable threshold B, degree of superheat
The following relationship is satisfied:
obviously, 0<λ<1, and deviation from superheat degree
In inverse proportion. Therefore, the degree of superheat is deviated
The larger the coefficient of the integrating part, the faster the integration speed.
In the above embodiments, in step S10, the control cycle of the electronic expansion valve is also prestored, and the operating performance of the electronic expansion valve can be stabilized by PID adjustment in the control cycle.
After step S140 or S150, the next control cycle is entered, and the process returns to step S20.
Therefore, in the present invention, the control process of the above-described electronic expansion valve is repeated.
On the other hand, in formula (1) and formula (2), the coefficient D = 0. At this time, the adjustment of the opening degree of the electronic expansion valve is proportional-integral adjustment.
The opening degree adjusting method of the electronic expansion valve in the embodiment is a fuzzy control method. Of course, other control methods may be used to adjust the opening degree of the electronic expansion valve, for example, the opening degree or the operation amount corresponding to the electronic expansion valve may be set according to different external environments where the refrigeration system is located.
The control method of the electronic expansion valve provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (5)
1. A control method of an electronic expansion valve, characterized by comprising the steps of:
10) pre-storing a target superheat degree T of the electronic expansion valve;
20) acquiring the current superheat Tsh of the electronic expansion valve, and calculating a superheat difference delta Tsh between the current superheat Tsh and the target superheat T, wherein the absolute value of the superheat difference delta Tsh is superheat deviation
；
30) According to the superheat deviation
Controlling the electronic expansion valve to have different opening degrees;
in the step 10), a stable threshold value B of the electronic expansion valve is also prestored;
in step 30), the superheat degree deviation is compared
With the stable threshold B, if the | Δ Tsh | ≧ B, go to step 140), otherwise, go to step 150);
140) calculating the current action amount of the electronic expansion valve according to the following formula (1)
；
150) Calculating the current action amount of the electronic expansion valve according to the following formula (2)
；
Wherein:
the current action quantity of the electronic expansion valve is obtained;
p, I, D are known coefficients;
k is the monitoring times;
wherein the content of the first and second substances,
is a correction value of coefficient I and satisfies 0<λ<1。
2. Control method according to claim 1, characterized in that the correction value
As said degree of superheat deviation
Or a function of the current degree of superheat Tsh.
3. Control method according to claim 1, characterized in that the correction value
Deviation from the stability threshold B and the superheat degree
The following relationship is satisfied:
4. the control method according to any one of claims 1-3, wherein in step 10), control periods of the electronic expansion valve are also prestored, and the working performance of the electronic expansion valve is stable in each control period;
step 140) or 150), the next said control cycle is entered and returns to step 20).
5. The control method according to any one of claims 1 to 3, characterized in that in formula (1), a coefficient D = 0.
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| CN201810015905.4A CN110017634B (en) | 2018-01-08 | 2018-01-08 | Control method of electronic expansion valve |
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| CN111006373B (en) * | 2019-12-09 | 2021-05-04 | 珠海格力电器股份有限公司 | Electric cabinet and control method thereof |
| CN112283903B (en) * | 2020-09-11 | 2022-03-01 | 海信（山东）空调有限公司 | Air conditioner and control method of expansion valve |
| CN114911286B (en) * | 2022-05-07 | 2023-07-07 | 江苏拓米洛高端装备股份有限公司 | PID control coefficient determining method, device, equipment and medium |
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