CN105222441B - Control method and device of refrigeration system - Google Patents
Control method and device of refrigeration system Download PDFInfo
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- CN105222441B CN105222441B CN201510552124.5A CN201510552124A CN105222441B CN 105222441 B CN105222441 B CN 105222441B CN 201510552124 A CN201510552124 A CN 201510552124A CN 105222441 B CN105222441 B CN 105222441B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000001603 reducing effect Effects 0.000 claims description 21
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 238000009790 rate-determining step (RDS) Methods 0.000 description 3
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention provides a control method and a control device of a refrigerating system, wherein the method comprises the following steps: judging whether the current exhaust temperature value of the refrigeration system is greater than a first preset temperature value and does not meet protection control conditions; if so, adjusting the opening degree of the electronic expansion valve and/or the operating frequency of the compressor until the difference between the exhaust temperature value and the exhaust temperature target value is smaller than a first preset difference. The invention solves the technical problem that the refrigeration system can not be effectively controlled under the high-temperature working condition in the prior art to cause system failure, and achieves the effect of effectively controlling the refrigeration system under the high-temperature working condition, thereby ensuring that the refrigeration system can reliably and normally operate.
Description
Technical field
The present invention relates to air conditioner controlling technology fields, in particular to the control method and device of a kind of refrigeration system.
Background technique
Currently, the control for electric expansion valve, mostly uses the closed loop feedback control side PID based on detection delivery temperature
Method, the control method can quickly and accurately realize the control to electronic expansion valve opening.
However, in Fig. 1, which includes for small-sized one-to-one R32 refrigeration system as shown in Figure 1：
Compressor 101, four-way valve 102, outdoor heat exchanger 105, indoor heat exchanger 103, electric expansion valve 104,106 and of indoor blower
Outside blower 107, since delivery temperature ratio R410A refrigeration system of R32 refrigeration system under the conditions of identical temperature is high by 10
~20 DEG C.If may under the conditions of worst hot case using temprature control method identical with R410A refrigeration system
Appearance caused due to excessive discharge temperature directly there is a situation where frequency reducings even to protect shutdown.
How effective control to R32 refrigeration system is realized, to meet the normal operation of refrigeration system under worst hot case
Demand, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the invention provides a kind of control method of refrigeration system, with solve in the prior art refrigeration system in height
The frequency reducing occurred under warm operating condition by excessive discharge temperature even shut down etc. can not normal reliable operation the technical issues of, the party
Method includes：
Judge whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection control strip
Part；
If it is, the aperture of adjustment electric expansion valve and/or the running frequency of compressor, until outlet air temperature and row
Difference between gas temperature target is less than the first preset difference value.
In one embodiment, judge the current outlet air temperature of refrigeration system whether be greater than the first preset temperature value and
Discontented foot protection control condition, including：
Determine whether current outlet air temperature is greater than first preset temperature value；
If it is, judging whether current outlet air temperature is higher than preset delivery temperature protection threshold value；
If current outlet air temperature protects threshold value not higher than the preset delivery temperature, it is determined that current exhaust
Temperature value is discontented with foot protection control condition.
In one embodiment, the preset temperature protection threshold value includes at least one of：Frequency increases limitation
Temperature value, frequency reducing temperature value or compressor shutdown temperature value.
In one embodiment, the aperture of electric expansion valve and/or the running frequency of compressor are adjusted, until exhaust temperature
Difference between angle value and delivery temperature target value less than the first preset difference value, including：
Increase the aperture of electric expansion valve；
Whether the indoor load after determining the aperture for increasing electric expansion valve is more than or equal to indoor load preset value；
If it is, judging the current running frequency of compressor, if be less than current outdoor environment temperature and current indoor
The corresponding maximum frequency of load；
If it is, increasing the running frequency of compressor；
Whether the difference between outlet air temperature and delivery temperature target value after determining the running frequency for increasing compressor
Less than the first preset difference value；
If it is not, then continuing to adjust the aperture of electric expansion valve and/or the running frequency of compressor.
In one embodiment, after the running frequency for increasing compressor, the above method further includes：
Judge to increase whether the indoor load after the running frequency of compressor is less than indoor load preset value；
If it is, reducing the aperture of electric expansion valve；
Judge to reduce whether the outlet air temperature after the aperture of electric expansion valve is greater than first preset temperature value；
If it is, reducing the running frequency of compressor；
Whether the difference between outlet air temperature and delivery temperature target value after determining the running frequency for reducing compressor
Less than the second preset difference value；
If it is not, then continuing the running frequency of adjustment compressor.
In one embodiment, the delivery temperature target value is determined according to following formula：
Tds_i=(Tds_i-1+Tds_l_i)/2
Wherein, Tds_iIndicate the delivery temperature target value at i moment, Tds_l_iIndicate the interim delivery temperature target at i moment
Value；
Tds_l=a1Te 2+a2Tc 2+a3TeTc+a4Te+a5Tc+a6F2+a7F+a8
Wherein, T indicates evaporating temperature, TcIndicate that condensation temperature, F indicate the running frequency of compressor, a1、a2、a3、a4、a5、
a6、a7And a8Indicate design factor.
The embodiment of the invention also provides a kind of control devices of refrigeration system, are existed with solving refrigeration system in the prior art
The frequency reducing occurred under worst hot case by excessive discharge temperature even shut down etc. can not normal reliable operation the technical issues of, should
Device includes：
Judgment module, for judging whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented
Foot protection control condition；
Module is adjusted, for being greater than the first preset temperature value and discontented foot protection in the current outlet air temperature of refrigeration system
In the case where control condition, the aperture of electric expansion valve and/or the running frequency of compressor are adjusted, until outlet air temperature and row
Difference between gas temperature target is less than the first preset difference value.
In one embodiment, the judgment module includes：
First determination unit, for determining whether current outlet air temperature is greater than first preset temperature value；
Second determination unit, for sentencing in the case where current outlet air temperature is greater than first preset temperature value
Whether the current outlet air temperature that breaks is higher than preset delivery temperature protection threshold value；
Third determination unit, for protecting threshold value not higher than the preset delivery temperature in current outlet air temperature
In the case of, determine that current outlet air temperature is discontented with foot protection control condition.
In one embodiment, the adjustment module includes：
Aperture adding unit, for increasing the aperture of electric expansion valve；
4th determination unit, for determining whether the indoor load after the aperture for increasing electric expansion valve is more than or equal to interior
Load preset value；
5th determination unit is more than or equal to indoor negative for the indoor load after determining the aperture for increasing electric expansion valve
In the case where lotus preset value, the current running frequency of compressor is judged, if be less than current outdoor environment temperature and current indoor
The corresponding maximum frequency of load；
Frequency adding unit, for increasing the running frequency of compressor；
6th determination unit, the outlet air temperature and delivery temperature target after running frequency for determining increase compressor
Whether the difference between value is less than the first preset difference value；
Adjustment unit, for the outlet air temperature and delivery temperature target value after determining the running frequency for increasing compressor
Between difference be more than or equal to first preset difference value in the case where, continue the aperture and/or compressor that adjust electric expansion valve
Running frequency.
In one embodiment, the delivery temperature target value is determined according to following formula：
Tds_i=(Tds_i-1+Tds_l_i)/2
Wherein, Tds_iIndicate the delivery temperature target value at i moment, Tds_l_iIndicate the interim delivery temperature target at i moment
Value；
Tds_l=a1Te 2+a2Tc 2+a3TeTc+a4Te+a5Tc+a6F2+a7F+a8
Wherein, T indicates evaporating temperature, TcIndicate that condensation temperature, F indicate the running frequency of compressor, a1、a2、a3、a4、a5、
a6、a7And a8Indicate design factor.
In the above-described embodiments, a kind of control method of refrigeration system is proposed, in the current delivery temperature of refrigeration system
Value does not reach the condition for needing to protect control beyond setting value again in the case that, in conjunction with outlet air temperature, delivery temperature target value
The aperture of electric expansion valve and the running frequency of compressor are adjusted with parameters such as indoor loads, is existed in the prior art to solve
The technical issues of can not controling effectively to refrigeration system under worst hot case and leading to the system failure, reach to refrigeration system
Effective control under worst hot case, to ensure that refrigeration system can reliably, normally be run.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the system structure diagram of R32 refrigeration system according to an embodiment of the present invention；
Fig. 2 is the control method flow chart of refrigeration system according to an embodiment of the present invention；
Fig. 3 is refrigeration system control flow chart according to one embodiment of the present invention；
Fig. 4 is the refrigeration system control flow chart of another embodiment according to the present invention；
Fig. 5 is the mechanism block diagram of the control device of refrigeration system according to an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right below with reference to embodiment and attached drawing
The present invention is described in further details.Here, exemplary embodiment and its explanation of the invention is used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
R32 refrigeration system as shown in Figure 1 not only includes compressor 101, four-way valve 102, outdoor heat exchange shown in figure
Device 105, indoor heat exchanger 103, electric expansion valve 104, indoor blower 106 and outside blower 107 can also include：If
Set outdoor environment temperature sensing package (not indicating in figure) on outdoor heat exchanger 105 and outdoor heat exchanger tube temperature temperature sensing package (in figure not
Mark), to detect outdoor environment temperature and outdoor heat exchanger temperature；Indoor environment sense on heat exchanger 103 indoors is set
Thermometer bulb (not indicated in figure) and indoor heat exchanger temperature sensing package (not indicated in figure), to detect indoor environment temperature and indoor heat exchange
Device temperature；The compressor exhaust temperature temperature sensing package (not indicating in figure) of compressor air-discharging side is set, to detect compressor 101
Delivery temperature.
Refrigeration system circulation is as follows：By refrigerant superheat gas (the i.e. compressor for the high temperature and pressure that compressor 101 is discharged
Exhaust) after four-way valve 102 enter outdoor heat exchanger 105, the heat release in outdoor heat exchanger 105, the system of high temperature and pressure
Cryogen subcooled liquid, then through 104 reducing pressure by regulating flow of electric expansion valve, the refrigerant two-phase mixture for becoming low-temp low-pressure enters room
Interior heat exchanger 103, evaporation of absorbing heat in heat exchanger 103 indoors, becomes the refrigerant superheat gas of low-temp low-pressure, then through four-way
Valve 102, which enters in compressor 101, to be compressed, and the refrigerant superheat gas of high temperature and pressure is become, to complete a circulation.
In this example, a kind of control method of refrigeration system is provided, as shown in Fig. 2, this approach includes the following steps：
Step 201：Judge whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and is unsatisfactory for protecting
Protect control condition；
For example, can judge whether the current outlet air temperature of refrigeration system is greater than the first preset temperature in the following way
Value and discontented foot protection control condition：Determine whether current outlet air temperature is greater than first preset temperature value；If so,
Then judge whether current outlet air temperature is higher than preset delivery temperature protection threshold value；If current outlet air temperature is not high
Threshold value is protected in the preset delivery temperature, it is determined that current outlet air temperature is discontented with foot protection control condition.Wherein, on
It states preset delivery temperature protection threshold value and can be, but not limited to and include：Frequency increases limit temperature value, frequency reducing temperature value or pressure
Contracting machine shutdown temperature value etc..
For example, which may include：
Compare delivery temperature TdisWith preset value T1Size, if Tdis>T1, then enter and judge in next step, otherwise execute normal
The control of rule；
Compare delivery temperature TdisWith preset value T2、T3、T4Size, if, Tdis>T2Or Tdis>T3Or Tdis>T4,
Exhaust protection control is then executed, otherwise executes rate-determining steps provided by subsequent this example, wherein T2Indicate that frequency increases limitation temperature
Degree, T3Indicate frequency reducing temperature, T4It indicates compressor shutdown temperature, and meets T2<T3<T4, wherein T2Value can be >=100.
Further, consider T during actually realizing2<T3<T4, T2To be the smallest in three preset values, therefore,
It only needs to judge whether delivery temperature is greater than T2As long as because being not higher than T2, then delivery temperature is necessarily not higher than T3With
T4's.
Step 202：If it is, the aperture of adjustment electric expansion valve and/or the running frequency of compressor, until exhaust temperature
Difference between angle value and delivery temperature target value is less than the first preset difference value.
Optionally, in the running frequency of the aperture and/or compressor that adjust electric expansion valve, it mainly can be and pass through increasing
Add or reduce the aperture of electric expansion valve, or increases and reduce the running frequency of compressor to be adjusted, this process
It can be the process to move in circles, i.e., persistently detected and adjusted, it, can to guarantee during refrigeration system is run
With the difference that levels off between outlet air temperature and delivery temperature target value less than the first preset difference value.
Specifically, the aperture of electric expansion valve and/or the running frequency of compressor can be adjusted in the following way, until
Difference between outlet air temperature and delivery temperature target value may include less than the first preset difference value：
S11：Increase the aperture of electric expansion valve；
S12：Whether the indoor load after determining the aperture for increasing electric expansion valve is more than or equal to indoor load preset value；
S13：If it is, judging the current running frequency of compressor, if less than current outdoor environment temperature and currently
The corresponding maximum frequency of indoor load；
S14：If it is, increasing the running frequency of compressor；
S15：The difference between outlet air temperature and delivery temperature target value after determining the running frequency for increasing compressor
Whether less than the first preset difference value；
Wherein, delivery temperature target value can be determined according to following formula：
Tds_i=(Tds_i-1+Tds_l_i)/2
Wherein, Tds_iIndicate the delivery temperature target value at i moment, Tds_l_iIndicate the interim delivery temperature target at i moment
Value；
Tds_l=a1Te 2+a2Tc 2+a3TeTc+a4Te+a5Tc+a6F2+a7F+a8
Wherein, T indicates evaporating temperature, TcIndicate that condensation temperature, F indicate the running frequency of compressor, a1、a2、a3、a4、a5、
a6、a7And a8Indicate design factor, and these calculate it is following can be different with the difference of compressor and system.
S16：If it is not, then continuing to adjust the aperture of electric expansion valve and/or the running frequency of compressor.
After above-mentioned S14, can also include：
S17：Judge to increase whether the indoor load after the running frequency of compressor is less than indoor load preset value, if
It is then to reduce the aperture of electric expansion valve；
S18：Judge to reduce whether the outlet air temperature after the aperture of electric expansion valve is greater than first preset temperature value,
If it is, reducing the running frequency of compressor；
S19：The difference between outlet air temperature and delivery temperature target value after determining the running frequency for reducing compressor
Whether less than the second preset difference value；
S20：If it is not, then continuing the running frequency of adjustment compressor.
That is, the adjustment process of the running frequency of the aperture and compressor of electric expansion valve is all the mistake gradually adjusted
Journey is not the adjustment process settled at one go, needs to be adjusted and improved step by step in increase, reduction and judgement, directly
To the requirement for meeting system normal operation.
Book is illustrated to the control method of above-mentioned refrigeration system below with reference to two specific embodiments, at the two
In specific embodiment, used basic principle is not depart from above-mentioned total inventive concept, and difference, which is also that, various to be sentenced
Disconnected time point is different, but total processing direction is identical.
Embodiment 1
With reference to a kind of flow diagram for the control method that Fig. 3 is refrigeration system, as shown in figure 3, including the following steps：
S1：Compare delivery temperature TdisWith preset value T1Size, if Tdis>T1, then enter S2, otherwise execute the normal of S5
Rule control；
Wherein, T1>=95 can be more than or equal to；
S2：Compare delivery temperature TdisWith preset value T2、T3、T4Size, if Tdis>T2Or Tdis>T3Or Tdis>
T4, then the exhaust protection rate-determining steps of S6 are executed, it is no to then follow the steps S301；
T2Indicate that frequency increases limit temperature, T3Indicate frequency reducing temperature, T4It indicates compressor shutdown temperature, and meets T2<T3<
T4, wherein T2Value can be >=100.
S301：Electronic expansion valve opening increases Δ P on the basis of existing aperture, wherein and Δ P can be a preset value,
In the preset value can pass through association outdoor environment temperature, compressor exhaust temperature, compressor operating frequency and preset value etc.
Parameter is calculated.
S302：Judge delivery temperature TdisWhether T is less than5, if so, thening follow the steps S303, otherwise return to step
S301, wherein T5It can be with value for 95；
S303：Judge current indoor load Δ T and preset value Δ TiSize, if Δ T >=Δ Ti, then enter step
Otherwise S304 enters step S401；
Wherein, Δ T=Tin-TIf, i.e. the difference of indoor environment temperature and set temperature, preset value Δ Ti≥3；
S304：Judge whether current frequency F is less than current outdoor environment temperature T0Maximum frequency corresponding with indoor load Δ T
Rate is to enter step S305, otherwise enters step S308；
S305：Compressor frequency increases Δ F on the basis of current frequency, wherein Δ F is also a preset value；
S306：Compare | Tdis-Tds| with preset value T6Size, if | Tdis-Tds|≥T6, then S308 is entered step, otherwise
Enter step S307, wherein T6>=10, and：
Delivery temperature target value can be determined according to following formula：
Tds_i=(Tds_i-1+Tds_l_i)/2
Wherein, Tds_iIndicate the delivery temperature target value at i moment, Tds_l_iIndicate the interim delivery temperature target at i moment
Value；
Tds_l=a1Te 2+a2Tc 2+a3TeTc+a4Te+a5Tc+a6F2+a7F+a8
Wherein, T indicates evaporating temperature, TcIndicate that condensation temperature, F indicate the running frequency of compressor, a1、a2、a3、a4、a5、
a6、a7And a8Indicate design factor, and these calculate it is following can be different with the difference of compressor and system.
S307：Compare delivery temperature TdisWith preset value T1Size, if Tdis>T1, then return step S301, otherwise returns
Step S304；
S308：Keep current operation frequency；
S309：Judge current indoor load Δ T and preset value Δ TiSize, if Δ T >=Δ Ti, then return step
S308, it is no to then follow the steps S401；
S401：Electronic expansion valve opening reduces Δ P on the basis of existing aperture, wherein Δ P can be a preset value；
S402：Compare delivery temperature TdisWith preset value T1Size, if Tdis>T1, then S403 is entered step, is otherwise returned
Step S401；
S403：Compressor frequency reduces Δ F on the basis of current frequency；
S404：Compare delivery temperature TdisWith preset value T1Size, if Tdis<T1, then S405 is entered step, is otherwise returned
Execute step S403；
S405：Compare | Tdis-Tds| with preset value T7Size, if | Tdis-Tds|≤T7, then return step S5, otherwise into
Enter step S406, wherein T7≤5；
S406：Judge current indoor load Δ T and preset value Δ Ti+1Size, if Δ T >=Δ Ti+1, then enter step
S407, otherwise return step S401, wherein Δ Ti≥ΔTi+1；
S407：Judge whether current frequency F is greater than current outdoor environment temperature T0Maximum frequency is corresponded to indoor load Δ T
Fmax, if it is, otherwise return step S401 enters step S408；
S408：Keep current operation frequency and aperture；
S409：Judge current indoor load Δ T and preset value Δ Ti+1Size, if Δ T >=Δ Ti+1, then enter step
Otherwise S410 returns to step S401；
S410：Judge current indoor load Δ T and preset value Δ TiSize, if Δ T >=Δ Ti, then return step
S304, otherwise return step S408.
Embodiment 2
With reference to another flow diagram for the control method that Fig. 4 is refrigeration system, as shown in figure 4, including the following steps：
S1：Compare delivery temperature TdisWith preset value T1Size, if Tdis>T1, then enter S2, otherwise execute the normal of S5
Rule control；
Wherein, T1>=95 can be more than or equal to；
S2：Compare delivery temperature TdisWith preset value T2、T3、T4Size, if Tdis>T2Or Tdis>T3Or Tdis>
T4, then the exhaust protection rate-determining steps of S6 are executed, it is no to then follow the steps S301；
T2Indicate that frequency increases limit temperature, T3Indicate frequency reducing temperature, T4It indicates compressor shutdown temperature, and meets T2<T3<
T4, wherein T2Value can be >=100.
S301：Electronic expansion valve opening increases Δ P on the basis of existing aperture, wherein and Δ P can be a preset value,
In the preset value can pass through association outdoor environment temperature, compressor exhaust temperature, compressor operating frequency and preset value etc.
Parameter is calculated.
S302：Judge delivery temperature TdisWhether T is less than5, if so, thening follow the steps S303, otherwise return to step
S301, wherein T5It can be with value for 95；
S303：Judge current indoor load Δ T and preset value Δ TiSize, if Δ T >=Δ Ti, then enter step
Otherwise S304 enters step S401；
Wherein, Δ T=Tin-TIf, i.e. the difference of indoor environment temperature and set temperature；
S304：Judge whether current frequency F is less than current outdoor environment temperature T0Maximum frequency corresponding with indoor load Δ T
Rate Fmax, it is to enter step S305, otherwise enters step S312；
S305：Compressor frequency increases Δ F on the basis of current frequency, wherein Δ F is also a preset value；
S306：Compare delivery temperature TdisWith preset value T1Size, if Tdis>T1, return step S301, otherwise into step
Rapid S307；
S307：Compare | Tdis-Tds| with preset value T6Size, if | Tdis-Tds|≥T6, then S308 is entered step, otherwise
Enter step S315, wherein T6≥10；
S308：Electronic expansion valve opening reduces Δ P on the basis of existing aperture, wherein Δ P can be a preset value；
S309：Compare | Tdis-Tds| with preset value T6Size, if | Tdis-Tds|≥T6, then return step S308, otherwise
Enter step S310；
S310：Compare delivery temperature TdisWith preset value T1Size, if Tdis>T1, S311 is entered step, step is otherwise entered
Rapid S317；
S312：Compressor operates in outdoor environment temperature T0, indoor load Δ T and T0Maximum frequency corresponding with Δ T
Fmax
S313：Compare delivery temperature TdisWith preset value T1Size, if Tdis>T1, then S2 is entered step, step is otherwise entered
Rapid S314；
S314：Judge current indoor load Δ T and preset value Δ TiSize, if Δ T >=Δ Ti, then return step
Otherwise S312 enters step S401；
S315：The running frequency for keeping compressor current；
S316：Compare delivery temperature TdisWith preset value T1Size, if Tdis>T1, then S2 is entered step, step is otherwise entered
Rapid S317；
S317：Judge current indoor load Δ T and preset value Δ TiSize, if Δ T >=Δ Ti, then return step
Otherwise S315 enters step S401；
S401：Compressor frequency reduces Δ F on the basis of current operation frequency, and Δ F is a preset value；
S402：Compare delivery temperature TdisWith preset value T5Size, if Tdis<T5, then S403 is entered step, is otherwise returned
Step S401；
S403：Electronic expansion valve opening reduces Δ P on the basis of existing aperture, wherein Δ P can be a preset value；
S404：Compare delivery temperature TdisWith preset value T5Size, if Tdis>T5, S405 is entered step, step is otherwise returned
Rapid S403；
S405：Compare | Tdis-Tds| with preset value T7Size, if | Tdis-Tds|≤T7, then the conventional control of S5 is entered step
It makes, otherwise return step S401, wherein T7≤5。
In the above-described embodiment, when delivery temperature is higher than preset value and discontented foot protection control condition, electronic expansion
Valve opening increases on the basis of existing aperture, when execution electronic expansion valve opening opens big, by judging compressor exhaust temperature
Determine whether further to open with the difference of target exhaust temperature it is big or when compressor exhaust temperature reduced by frequency reducing, with
This is too low to prevent compressor air suction mass dryness fraction, so that it is guaranteed that the reliability of compressor.Wherein it is possible to be sentenced by indoor load size
The adjustment of disconnected compressor operating frequency；
It further, can be by being associated with outdoor environment temperature, compressor air-discharging to the adjustment amount of electronic expansion valve opening
The parameters such as temperature, compressor operating frequency and preset value are calculated, and above-mentioned target exhaust temperature can be indoor by association
Heat exchange temperature, outdoor heat exchanger temperature, compressor operating frequency etc. are calculated, and frequency adjustment can be outdoor by association
The parameters such as environment temperature, indoor load and the maximum allowable running frequency of compressor are calculated.
When indoor load reduces, can be reduced by reducing electronic expansion valve opening and reducing compressor operating frequency
The delivery temperature of compressor, and determine whether to execute often by judging the difference of compressor exhaust temperature and target exhaust temperature
Rule control.
It is important to note, however, that being only to provide two specific examples in above-mentioned two embodiment to illustrate this hair
Bright, the specific step in the inside and decision logic can according to need and adjust with actual conditions, and the application is not construed as limiting this.
Based on the same inventive concept, a kind of control device of refrigeration system is additionally provided in the embodiment of the present invention, it is such as following
Embodiment described in.Since the principle that the control device of refrigeration system solves the problems, such as is similar to the control method of refrigeration system, because
The implementation of the control device of this refrigeration system may refer to the implementation of the control method of refrigeration system, and overlaps will not be repeated.
Used below, the combination of the software and/or hardware of predetermined function may be implemented in term " unit " or " module ".Although with
Device described in lower embodiment is preferably realized with software, but the combined realization of hardware or software and hardware
It may and be contemplated.Fig. 5 is a kind of structural block diagram of the control device of the refrigeration system of the embodiment of the present invention, such as Fig. 5 institute
Show, may include：Judgment module 501 and adjustment module 502, are below illustrated the structure.
Judgment module 501, for judge the current outlet air temperature of refrigeration system whether be greater than the first preset temperature value and
Discontented foot protection control condition；
Module 502 is adjusted, for being greater than the first preset temperature value in the current outlet air temperature of refrigeration system and being unsatisfactory for
In the case where protecting control condition, the aperture of electric expansion valve and/or the running frequency of compressor are adjusted, until outlet air temperature
Difference between delivery temperature target value is less than the first preset difference value.
In one embodiment, judgment module 501 may include：First determination unit, for determining current exhaust
Whether temperature value is greater than first preset temperature value；Second determination unit, it is described for being greater than in current outlet air temperature
In the case where first preset temperature value, judge whether current outlet air temperature is higher than preset delivery temperature protection threshold value；The
Three determination units, in the case where current outlet air temperature is not higher than the preset delivery temperature protection threshold value, really
Outlet air temperature before settled is discontented with foot protection control condition.
In one embodiment, adjustment module 502 includes：Aperture adding unit, for increasing opening for electric expansion valve
Degree；4th determination unit, for determining whether the indoor load after the aperture for increasing electric expansion valve is more than or equal to indoor load
Preset value；5th determination unit is more than or equal to indoor negative for the indoor load after determining the aperture for increasing electric expansion valve
In the case where lotus preset value, the current running frequency of compressor is judged, if be less than current outdoor environment temperature and current indoor
The corresponding maximum frequency of load；Frequency adding unit, for increasing the running frequency of compressor；6th determination unit, for true
Whether the difference between outlet air temperature and delivery temperature target value after increasing the running frequency of compressor surely is pre- less than first
If difference；Adjustment unit, for the outlet air temperature and delivery temperature target value after determining the running frequency for increasing compressor
Between difference be more than or equal to first preset difference value in the case where, continue the aperture and/or compressor that adjust electric expansion valve
Running frequency.
In one embodiment, delivery temperature target value is determined according to following formula：
Tds_i=(Tds_i-1+Tds_l_i)/2
Wherein, Tds_iIndicate the delivery temperature target value at i moment, Tds_l_iIndicate the interim delivery temperature target at i moment
Value；
Tds_l=a1Te 2+a2Tc 2+a3TeTc+a4Te+a5Tc+a6F2+a7F+a8
Wherein, T indicates evaporating temperature, TcIndicate that condensation temperature, F indicate the running frequency of compressor, a1、a2、a3、a4、a5、
a6、a7And a8Indicate design factor.
It can be seen from the above description that the embodiment of the present invention realizes following technical effect：Propose a kind of refrigeration
The control method of system does not reach the condition for needing to protect control in the current outlet air temperature of refrigeration system again beyond setting value
In the case where, in conjunction with the parameters such as outlet air temperature, delivery temperature target value and indoor load adjustment electric expansion valve aperture and
The running frequency of compressor, thus solve can not control effectively in the prior art to refrigeration system under worst hot case and
The technical issues of leading to the system failure, has reached effective control to refrigeration system under worst hot case, to ensure that refrigeration
System can reliably, normally be run.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
It is realized with general computing device, they can be concentrated on a single computing device, or be distributed in multiple computing devices
On composed network, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and be performed by computing device in the storage device, and in some cases, can be held with the sequence for being different from herein
The shown or described step of row, perhaps they are fabricated to each integrated circuit modules or will be multiple in them
Module or step are fabricated to single integrated circuit module to realize.In this way, the embodiment of the present invention be not limited to it is any specific hard
Part and software combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of control method of refrigeration system, including：
Judge whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and discontented foot protection control condition；
If it is, the aperture of adjustment electric expansion valve and the running frequency of compressor, alternatively, the operation frequency of adjustment compressor
Rate, until the difference between outlet air temperature and delivery temperature target value is less than the first preset difference value；
Wherein, the aperture of electric expansion valve and the running frequency of compressor are adjusted, alternatively, the running frequency of adjustment compressor, directly
To the difference between outlet air temperature and delivery temperature target value less than the first preset difference value, including：
Increase the aperture of electric expansion valve；
Whether the indoor load after determining the aperture for increasing electric expansion valve is more than or equal to indoor load preset value；
If it is, judging the current running frequency of compressor, if be less than current outdoor environment temperature and current indoor load
Corresponding maximum frequency；
If it is, increasing the running frequency of compressor；
Whether the difference between outlet air temperature and delivery temperature target value after determining the running frequency for increasing compressor is less than
First preset difference value；
If it is not, then continuing to adjust the aperture of electric expansion valve and/or the running frequency of compressor.
2. the method according to claim 1, wherein judging whether the current outlet air temperature of refrigeration system is greater than
First preset temperature value and discontented foot protection control condition, including：
Determine whether current outlet air temperature is greater than first preset temperature value；
If it is, judging whether current outlet air temperature is higher than preset delivery temperature protection threshold value；
If current outlet air temperature protects threshold value not higher than the preset delivery temperature, it is determined that current delivery temperature
It is worth discontented foot protection control condition.
3. according to the method described in claim 2, it is characterized in that, the preset temperature protection threshold value include it is following at least it
One：Frequency increases limit temperature value, frequency reducing temperature value or compressor shutdown temperature value.
4. the method according to claim 1, wherein increase compressor running frequency after, the method
Further include：
Judge to increase whether the indoor load after the running frequency of compressor is less than indoor load preset value；
If it is, reducing the aperture of electric expansion valve；
Judge to reduce whether the outlet air temperature after the aperture of electric expansion valve is greater than first preset temperature value；
If it is, reducing the running frequency of compressor；
Whether the difference between outlet air temperature and delivery temperature target value after determining the running frequency for reducing compressor is less than
Second preset difference value；
If it is not, then continuing the running frequency of adjustment compressor.
5. a kind of control device of refrigeration system, including：
Judgment module, for judging whether the current outlet air temperature of refrigeration system is greater than the first preset temperature value and is unsatisfactory for protecting
Protect control condition；
Module is adjusted, for being greater than the first preset temperature value and discontented foot protection control in the current outlet air temperature of refrigeration system
In the case where condition, the aperture of electric expansion valve and the running frequency of compressor are adjusted, alternatively, the operation frequency of adjustment compressor
Rate, until the difference between outlet air temperature and delivery temperature target value is less than the first preset difference value；
Wherein, the adjustment module includes：
Aperture adding unit, for increasing the aperture of electric expansion valve；
4th determination unit, for determining whether the indoor load after the aperture for increasing electric expansion valve is more than or equal to indoor load
Preset value；
It is pre- to be more than or equal to indoor load for the indoor load after determining the aperture for increasing electric expansion valve for 5th determination unit
If judging the current running frequency of compressor in the case where value, if be less than current outdoor environment temperature and current indoor load
Corresponding maximum frequency；
Frequency adding unit, for increasing the running frequency of compressor；
6th determination unit, for determine increase compressor running frequency after outlet air temperature and delivery temperature target value it
Between difference whether less than the first preset difference value；
Adjustment unit, in the outlet air temperature after the running frequency for determining increase compressor and between delivery temperature target value
Difference be more than or equal to the first preset difference value in the case where, continue adjust electric expansion valve aperture and/or compressor operation
Frequency.
6. device according to claim 5, which is characterized in that the judgment module includes：
First determination unit, for determining whether current outlet air temperature is greater than first preset temperature value；
Second determination unit, in the case where current outlet air temperature is greater than first preset temperature value, judgement to be worked as
Whether preceding outlet air temperature is higher than preset delivery temperature protection threshold value；
Third determination unit, for the case where current outlet air temperature is not higher than the preset delivery temperature protection threshold value
Under, determine that current outlet air temperature is discontented with foot protection control condition.
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| CN106556187B (en) * | 2016-11-10 | 2019-02-19 | 华为技术有限公司 | The control method that is run under air-conditioning refrigeration system critical state, apparatus and system |
| CN108278718B (en) * | 2017-01-04 | 2020-03-10 | 奥克斯空调股份有限公司 | Variable frequency air conditioner and control method thereof |
| CN106864203B (en) * | 2017-03-07 | 2019-08-06 | 安徽江淮汽车集团股份有限公司 | A kind of control method for frequency conversion air conditioner and system |
| CN107036256B (en) * | 2017-05-31 | 2019-06-11 | 广东美的制冷设备有限公司 | The control method of delivery temperature, the control device of delivery temperature and air conditioner |
| CN107091517B (en) * | 2017-06-30 | 2023-09-12 | 珠海格力电器股份有限公司 | Protection control method and device of air conditioner unit and air conditioner unit |
| CN108709295B (en) * | 2018-05-28 | 2020-12-29 | 宁波奥克斯电气股份有限公司 | Protection control method for variable-frequency multi-connected air conditioning system |
| CN108800432A (en) * | 2018-06-25 | 2018-11-13 | 重庆美的通用制冷设备有限公司 | The control method and device of the anti-overheat of compressor electric motor |
| CN109861623B (en) * | 2019-02-28 | 2021-02-02 | 宁波奥克斯电气股份有限公司 | Control method and device for preventing motor overload protection and air conditioner |
| CN110375418A (en) * | 2019-07-01 | 2019-10-25 | 广东美的制冷设备有限公司 | Air conditioner and its control method for electronic expansion valve, control device and storage medium |
| CN110410972A (en) * | 2019-07-25 | 2019-11-05 | 宁波奥克斯电气股份有限公司 | A kind of control method, device and the air conditioner of air conditioner delivery temperature |
| CN110701841B (en) * | 2019-11-15 | 2021-10-01 | 上海辛格林纳新时达电机有限公司 | Control method of variable-frequency air source heat pump |
| CN111380185B (en) * | 2020-03-27 | 2021-10-26 | 广东美的制冷设备有限公司 | Compressor exhaust temperature frequency limiting control method, air conditioner and readable storage medium |
| CN112665099A (en) * | 2020-12-10 | 2021-04-16 | 珠海格力电器股份有限公司 | Compressor exhaust high-temperature protection control method and device, air conditioner and control system |
| CN112880253B (en) * | 2021-02-25 | 2024-12-31 | 珠海格力电器股份有限公司 | Gas-liquid separator, air conditioning equipment and air conditioning equipment adjustment method |
| CN112984622A (en) * | 2021-04-01 | 2021-06-18 | 广东积微科技有限公司 | Control method for exhaust temperature of parallel multi-split system |
| CN113803242B (en) * | 2021-09-23 | 2023-05-26 | 广东美芝制冷设备有限公司 | Method, device, equipment, system and computer readable storage medium for testing compressor |
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