CN110017634A - A kind of control method of electric expansion valve - Google Patents
A kind of control method of electric expansion valve Download PDFInfo
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- CN110017634A CN110017634A CN201810015905.4A CN201810015905A CN110017634A CN 110017634 A CN110017634 A CN 110017634A CN 201810015905 A CN201810015905 A CN 201810015905A CN 110017634 A CN110017634 A CN 110017634A
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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
- F25B49/00—Arrangement or mounting of control or safety devices
-
- 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 present invention discloses a kind of control method of electric expansion valve, includes the following steps: the target superheat degree T for 10) prestoring the electric expansion valve；20) absolute value for obtaining the current degree of superheat Tsh of the electric expansion valve, and calculating the degree of superheat difference DELTA Tsh, the degree of superheat difference DELTA Tsh of the current degree of superheat Tsh and the target superheat degree T is degree of superheat deviation | Δ Tsh |；30) according to the degree of superheat deviation | Δ Tsh | the electric expansion valve is controlled, to make it have different apertures.Therefore, in the control method of above-mentioned electric expansion valve, can be according to the current degree of superheat deviation of refrigeration system | Δ Tsh | the aperture of electric expansion valve is adjusted in real time, so that refrigeration system keeps best refrigerant flow, and then the parameter of refrigeration system is made to be in optimum state, improve the stability and performance of system.
Description
Technical field
The present invention relates to refrigeration control technical field, in particular to a kind of control method of electric expansion valve.
Background technique
In existing freezer refrigeration system, throttling set is most of using heating power expansion valve.Heating power expansion valve master
The flow of refrigerant is adjusted by experiencing the size of evaporator outlet superheat refrigerant vapor degree, to maintain system that there is perseverance
The fixed degree of superheat.
Although heating power expansion valve can automatically adjust the flow of refrigerant, it the shortcomings that it is also very significant, such as to mistake
The problem that temperature corresponding delay time is long, adjustable range is limited, degree of regulation is low, so as to cause refrigeration system economy and
Safety can all have an adverse effect.
In view of this, how a kind of control method of electric expansion valve is provided,
Summary of the invention
In order to solve the above technical problems, it is an object of the present invention to provide a kind of control methods of electric expansion valve, including under
State step:
10) the target superheat degree T of the electric expansion valve is prestored；
20) the current degree of superheat Tsh of the electric expansion valve is obtained, and calculates the current degree of superheat Tsh and the mesh
The absolute value for marking the degree of superheat difference DELTA Tsh, the degree of superheat difference DELTA Tsh of degree of superheat T is degree of superheat deviation | Δ Tsh |；
30) according to the degree of superheat deviation | Δ Tsh | the electric expansion valve is controlled, to make it have different apertures.
Therefore, can be according to the current degree of superheat deviation of refrigeration system in the control method of above-mentioned electric expansion valve | Δ
Tsh | the aperture of electric expansion valve is adjusted in real time, so that refrigeration system keeps best refrigerant flow, and then makes refrigeration system
The parameter of system is in optimum state, improves the stability and performance of system.
Optionally, in step 30), it is swollen that the corresponding electronics of the current degree of superheat Tsh is calculated according to following formula (1)
The current action amount Δ E of swollen valve:
Δ E=P* Δ e (k)+I*e (k)+D* (Δ e (k)-Δ e (k-1)) (1)
Wherein: Δ E is the current action amount of the electric expansion valve；
E (k) is the degree of superheat difference DELTA Tsh；
Δ e (k) is the variation of the adjacent degree of superheat difference DELTA Tsh measured twice；
Δ e (k-1) was the variation of the degree of superheat difference DELTA Tsh in a upper period；
P, I, D are known coefficient；
K is monitoring number.
Optionally, in step 10), the stabilization threshold values B of the electric expansion valve is also prestored；
In step 30), the degree of superheat deviation | Δ Tsh | with the stable threshold values B, if described | Δ Tsh | < B,
It enters step 140), otherwise, enters step 150):
140) the current action amount Δ E of the electric expansion valve is calculated according to formula (1)；
150) the current action amount Δ E of the electric expansion valve is calculated according to following formula (2)；
Δ E=P* Δ e (k)+λ * I*e (k)+D* (Δ e (k)-Δ e (k-1)) (2)
Wherein, λ is the correction value of coefficient I, and meets λ > 1.
Optionally, the correction value λ is the degree of superheat deviation | Δ Tsh | or the function of the current degree of superheat Tsh.
Optionally, the correction value λ and the stable threshold values B, the degree of superheat deviation | Δ Tsh | meet following relationships:
Optionally, in step 10), the control period of the electric expansion valve is also prestored, within each control period, institute
State electric expansion valve stable working performance；
Step 140) or 150) after, into next control period, and be back to step 20).
Optionally, in formula (1), coefficient D=0.
Optionally, in step 10), the actuating quantity table of the electric expansion valve, the actuating quantity table note are also prestored
Record several degree of superheat deviations | Δ Tsh | range and each degree of superheat deviation | Δ Tsh | the corresponding electronic expansion valve actuation of range
It measures；
230) Cha Suoshu actuating quantity table, so as to according to the different degree of superheat deviations | Δ Tsh | the locating mistake
Temperature deviation | Δ Tsh | range obtains the current action amount Δ E of the electric expansion valve.
Detailed description of the invention
Fig. 1 is flow chart of the control method of electric expansion valve provided by the present invention in the first specific embodiment；
Fig. 2 is flow chart of the control method of electric expansion valve provided by the present invention in second of specific embodiment.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to make those skilled in the art more fully understand technical solution of the present invention
Applying example, the present invention is described in further detail.
Please refer to attached drawing 1-2, wherein Fig. 1 is that the control method of electric expansion valve provided by the present invention is specific at the first
Flow chart in embodiment；Fig. 2 is the control method of electric expansion valve provided by the present invention in second of specific embodiment
Flow chart.
In a specific embodiment, the present invention provides a kind of control method of electric expansion valve, as shown in Figure 1, the control
Method processed includes the following steps:
S10: the target superheat degree T of electric expansion valve is prestored；
S20: obtaining the current degree of superheat Tsh of electric expansion valve, and calculates current degree of superheat Tsh's and target superheat degree T
The absolute value of degree of superheat difference DELTA Tsh, degree of superheat difference DELTA Tsh are degree of superheat deviation | Δ Tsh |；
S30: according to degree of superheat deviation | Δ Tsh | control electric expansion valve, to make it have different apertures.
Therefore, can be according to the current degree of superheat deviation of refrigeration system in the control method of above-mentioned electric expansion valve | Δ
Tsh | the aperture of electric expansion valve is adjusted in real time, so that refrigeration system keeps best refrigerant flow, and then makes refrigeration system
The parameter of system is in optimum state, improves the stability and performance of system.
Wherein, when refrigeration system difference, the target superheat degree T of electric expansion valve is also different, in addition, can be according to evaporator
Current degree of superheat Tsh is calculated in the temperature difference of the air entry of medium temperature and compressor suction duct, and calculates target superheat degree T
Difference with current degree of superheat Tsh is as current degree of superheat difference DELTA Tsh.Therefore, main swollen by adjusting electronics in the present invention
Swollen valve opening makes current degree of superheat Tsh move closer to target superheat degree T, until electric expansion valve is in optimal aperture.
Specifically, in above-mentioned steps S30, the current of the corresponding electric expansion valve of current degree of superheat T is calculated according to formula (1)
Actuating quantity Δ E:
Δ E=P* Δ e (k)+I*e (k)+D* (Δ e (k)-Δ e (k-1)) (1)
Wherein, Δ E is the current action amount of electric expansion valve；E (k) is the degree of superheat difference DELTA Tsh, e (k)=Tsh-T；Δ
E (k) is the variation of the adjacent degree of superheat difference DELTA Tsh measured twice, Δ e (k)=e (k)-e (k-1)；Δ e (k-1) is upper one
The variation of period degree of superheat difference DELTA Tsh, Δ e (k-1)=e (k-1)-e (k-2).P, I, D are known coefficient, and k is monitoring time
Number.
Above-mentioned formula (1) is the fundamental formular that proportional integral differential adjusts (PID), and P is the coefficient of proportion adjustment part, I
For the coefficient of integral adjustment part, D is the coefficient that differential adjusts part.The current of electric expansion valve can be obtained according to the formula
Actuating quantity Δ E, and PID is adjusted to negative-feedback regu- lation process has the advantages that principle is simple, easy to use and strong applicability.
Therefore, it in the present embodiment, is adjusted by introducing PID, can be improved the degree of regulation of electronic expansion valve opening, promoted
Refrigeration system fast and stable.
It is appreciated that the adjusting of the refrigeration system degree of superheat needs a stabilization process, therefore, which stablizes ginseng
Number is not the corresponding parameter of the current aperture of electric expansion valve, i.e. the formation of refrigeration stable state lags behind the aperture of electric expansion valve
It adjusts, therefore, even if the current aperture of electric expansion valve has met current degree of superheat demand, but due to the shadow of hysteresis quality
It rings, control system can still adjust the aperture of electric expansion valve according to the degree of superheat difference DELTA Tsh for monitoring and calculating, so as to cause
There are biggish oscillations during adjusting for electric expansion valve, can not be stable at target superheat degree T, refrigeration system is caused to overheat
The degree stable time is elongated, and concussion lengthens, and influences performance.
In addition, refrigeration system start-up phase, the absolute value of degree of superheat difference DELTA Tsh | Δ Tsh | (degree of superheat deviation) is larger,
As the degree of superheat not up to target superheat degree T of setting for a long time, generated degree of superheat deviation is adjusted | Δ Tsh | one will be formed
A very big accumulating value, electronic expansion valve opening will be continuously increased due to accumulative effect.Reach when electronic expansion valve opening or
When beyond its limiting value, hereafter electronic expansion valve opening will enter saturation region, no longer further with the actuating quantity Δ E of input
Movement, and when degree of superheat deviation is reversed | Δ Tsh | when, the output aperture control amount of controller needs just exit saturation for a long time
Area, during this period of time electric expansion valve will stay on extreme position and be temporarily lost with control, so as to cause the property of refrigeration system
It can deteriorate, the time for reaching stable lengthens significantly.
Based on this, as shown in Fig. 2, the control device of electric expansion valve, which removes, prestores target superheat degree T in above-mentioned steps S10
Outside, it also prestores the stabilization threshold values B of electric expansion valve, stablizes mistake when threshold values B is current degree of superheat Tsh close to target superheat degree T
Numerical value corresponding to temperature difference is being stablized within the scope of threshold values B, and refrigeration system is in stable state, i.e., stable threshold values B being capable of table
Sign electric expansion valve is in best aperture.
Meanwhile as shown in Fig. 2, comparing degree of superheat deviation in above-mentioned steps S30 | Δ Tsh | with stablize threshold values B, if | Δ
Tsh | < B then enters step S140, otherwise, enters step S150.
S140: the current action amount Δ E of electric expansion valve is calculated according to above-mentioned formula (1)；
S150: the current action amount Δ E of electric expansion valve is calculated according to following formula (2)；
Δ E=P* Δ e (k)+λ * I*e (k)+D* (Δ e (k)-Δ e (k-1)) (2)
Wherein, λ is the correction value of coefficient I, and meets λ > 1.
In the present embodiment, when | Δ Tsh | when < B, the distance between current degree of superheat Tsh and target superheat degree the T (degree of superheat
Deviation) it is smaller, i.e., current degree of superheat Tsh, which is in, to be stablized within the scope of threshold values B, is worked as at this point, can directly be calculated according to above-mentioned formula (1)
The current action amount Δ E of the corresponding electric expansion valve of preceding degree of superheat Tsh.When | Δ Tsh | when >=B, current degree of superheat Tsh and target
The distance between degree of superheat T (degree of superheat deviation) is larger, i.e., current degree of superheat Tsh, which is in, to be stablized except threshold values B range, at this point,
The current action amount Δ E of the corresponding electric expansion valve of current degree of superheat Tsh can be calculated according to above-mentioned formula (2).
Obviously, | Δ Tsh | when >=B, the coefficient lambda * of integral part in the calculation formula of electric expansion valve current action amount Δ E
I is revised value, and the revised coefficient is greater than | Δ Tsh | the coefficient I of integral part, i.e. I≤λ * I when < B.Therefore, originally
In invention, when degree of superheat deviation smaller (| Δ Tsh | < B), integral coefficient is smaller, and integrating rate is very fast, when degree of superheat deviation compared with
Greatly (| Δ Tsh | >=B) when, integral coefficient is larger, and integral coefficient slows down, so as to prevent from adjusting electric expansion valve using PID
Aperture when integral element generate overshoot, reduce refrigeration system adjust when oscillation, and then shorten refrigeration system the stabilization time,
The influence for eliminating system hysteresis quality in adjustment process, mentions high control precision.
Therefore, the adjustment process of electronic expansion valve opening can be avoided hysteresis to the shadow of adjustment process in the present embodiment
It rings, guarantees that the oscillation of electric expansion valve adjustment process is smaller, it is shorter to stablize the time, additionally it is possible to avoid refrigeration system start-up phase electronics
Expansion valve rests on extreme position and out of hand, guarantees that electric expansion valve can work normally.
Specifically, above-mentioned correction value λ is degree of superheat deviation | Δ Tsh | or the function of current degree of superheat T.
Therefore, in the present embodiment, when | Δ Tsh | when >=B, the coefficient of integral part is not to determine greater than I in formula (2)
Value, but change with the variation of degree of superheat difference DELTA Tsh or current degree of superheat T, at this point, making corresponding current action amount Δ
The value of E is more accurate, so that further decreasing electric expansion valve reaches the time required for stable state.
More specifically, correction value λ and stablizing threshold values B, degree of superheat deviation | Δ Tsh | meet following relationships:
Obviously, λ > 1, and and degree of superheat deviation | Δ Tsh | it is inversely proportional.Therefore, degree of superheat deviation | Δ Tsh | bigger, integral
Partial coefficient is smaller, and integrating rate is faster.
In the above various embodiments, in step S10, the control period of the electric expansion valve is also prestored, in the control period,
It is adjusted by PID, the working performance of electric expansion valve can be stablized.
After step S 140 or S 150, into next control period, and it is back to step S20.
Therefore, in the present invention, the control process of above-mentioned electric expansion valve is repeated.
On the other hand, in formula (1) and formula (2), coefficient D=0.At this point, electronic expansion valve opening is adjusted to ratio
Integral adjustment.
In another embodiment, following regulative modes: step are also can be used in addition to adjusting using PID in electronic expansion valve opening
In S10, the control device of electric expansion valve also prestores the movement scale of electric expansion valve in addition to prestoring target superheat degree T
Lattice, several degree of superheat deviations of the actuating quantity charting | Δ Tsh | electric expansion valve corresponding to locating range and each range
Actuating quantity, wherein degree of superheat deviation | Δ Tsh | locating range is smaller, it is believed that degree of superheat deviation | Δ Tsh | in the range
When interior, the different corresponding current action amount Δ E of current degree of superheat Tsh is approximately equal.
S230: looking into actuating quantity table, according to different degree of superheat deviations | Δ Tsh | obtain the current dynamic of the electric expansion valve
Work amount Δ E.
The aperture regulation method of electric expansion valve is fuzzy control method in the embodiment.Certainly, others also can be used
Control method adjusts the aperture of electric expansion valve, for example, can according to locating for refrigeration system different external environments set electronics
The corresponding aperture of expansion valve or actuating quantity.
A kind of control method of electric expansion valve provided by the present invention is described in detail above.It is used herein
A specific example illustrates the principle and implementation of the invention, and the above embodiments are only used to help understand
Method and its core concept of the invention.It should be pointed out that for those skilled in the art, not departing from this
, can be with several improvements and modifications are made to the present invention under the premise of inventive principle, these improvement and modification also fall into the present invention
In scope of protection of the claims.
Claims (8)
1. a kind of control method of electric expansion valve, which is characterized in that include the following steps:
10) the target superheat degree T of the electric expansion valve is prestored；
20) the current degree of superheat Tsh of the electric expansion valve is obtained, and calculates the current degree of superheat Tsh and the target mistake
The absolute value of the degree of superheat difference DELTA Tsh, the degree of superheat difference DELTA Tsh of temperature T are degree of superheat deviation | Δ Tsh |；
30) according to the degree of superheat deviation | Δ Tsh | the electric expansion valve is controlled, to make it have different apertures.
2. control method according to claim 1, which is characterized in that in step 30), calculate institute according to following formula (1)
State the current action amount Δ E of the corresponding electric expansion valve of current degree of superheat Tsh:
Δ E=P* Δ e (k)+I*e (k)+D* (Δ e (k)-Δ e (k-1)) (1)
Wherein: Δ E is the current action amount of the electric expansion valve；
E (k) is the degree of superheat difference DELTA Tsh；
Δ e (k) is the variation of the adjacent degree of superheat difference DELTA Tsh measured twice；
Δ e (k-1) was the variation of the degree of superheat difference DELTA Tsh in a upper period；
P, I, D are known coefficient；
K is monitoring number.
3. control method according to claim 2, which is characterized in that in step 10), also prestore the electric expansion valve
Stablize threshold values B；
In step 30), the degree of superheat deviation | Δ Tsh | with the stable threshold values B, if described | Δ Tsh | < B, into
Enter step 140), otherwise, enter step 150):
140) the current action amount Δ E of the electric expansion valve is calculated according to formula (1)；
150) the current action amount Δ E of the electric expansion valve is calculated according to following formula (2)；
Δ E=P* Δ e (k)+λ * I*e (k)+D* (Δ e (k)-Δ e (k-1)) (2)
Wherein, λ is the correction value of coefficient I, and meets λ > 1.
4. control method according to claim 3, which is characterized in that the correction value λ is the degree of superheat deviation | Δ
Tsh | or the function of the current degree of superheat Tsh.
5. control method according to claim 3, which is characterized in that the correction value λ and stable threshold values B, described
Degree of superheat deviation | Δ Tsh | meet following relationships:
6. the control method according to any one of claim 3-5, which is characterized in that in step 10), also prestore the electricity
The control period of sub- expansion valve, within each control period, the electric expansion valve stable working performance；
Step 140) or 150) after, into next control period, and be back to step 20).
7. the control method according to any one of claim 2-5, which is characterized in that in formula (1), coefficient D=0.
8. control method according to claim 1, which is characterized in that in step 10), also prestore the electric expansion valve
Actuating quantity table, several degree of superheat deviations of actuating quantity charting | Δ Tsh | range and each degree of superheat deviation
| Δ Tsh | the corresponding electric expansion valve actuating quantity of range；
230) Cha Suoshu actuating quantity table, so as to according to the different degree of superheat deviations | Δ Tsh | the locating degree of superheat
Deviation | Δ Tsh | range obtains the current action amount Δ E of the electric expansion valve.
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| CN112283903A (en) * | 2020-09-11 | 2021-01-29 | 海信（山东）空调有限公司 | Air conditioner and control method of expansion valve |
| 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 |
| CN114911286A (en) * | 2022-05-07 | 2022-08-16 | 江苏拓米洛环境试验设备有限公司 | PID control coefficient determination method, device, equipment and medium |
| 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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