CN105299974B - A kind of control method of air conditioner electronic expansion valve - Google Patents
A kind of control method of air conditioner electronic expansion valve Download PDFInfo
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- CN105299974B CN105299974B CN201510730616.9A CN201510730616A CN105299974B CN 105299974 B CN105299974 B CN 105299974B CN 201510730616 A CN201510730616 A CN 201510730616A CN 105299974 B CN105299974 B CN 105299974B
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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
Abstract
The invention discloses a kind of control methods of air conditioner electronic expansion valve, including：After compressor start operation, the actual motion frequency of compressor is obtained, is made comparisons with setting running frequency；If the actual motion frequency is less than the setting running frequency, the aperture for controlling electric expansion valve is initial opening；Otherwise, the control process of initial operation stage tune valve is executed；After the run time of compressor start operation reaches setting initial operating time, the control process of PID tune valves is executed；The control process of the PID tune valve is that the process of PID control is carried out using the difference of the actual exhaust air temperature of compressor and target exhaust temperature as deviation, based on the deviation to the aperture of electric expansion valve；The target exhaust temperature is determined according to the actual motion frequency.With the application of the invention, the dynamic to electronic expansion valve opening may be implemented, quickly and accurately adjust, the Energy Efficiency Ratio of the air conditioner coolant circulatory system is improved.
Description
Technical field
The invention belongs to air-conditioning technique fields, specifically, be the control method for being related to air-conditioning, more specifically,
It is to be related to a kind of control method of air conditioner electronic expansion valve.
Background technology
Electric expansion valve is widely used in the air conditioner coolant circulatory system, as a kind of novel control element by right
The aperture of electric expansion valve is adjusted, and the refrigerant circulation in regulating system meets operation of air conditioner performance requirement.Therefore, such as
What control effectively to electric expansion valve, is the key that weigh air-conditioning system Energy Efficiency Ratio.
In the prior art, the generally use degree of superheat, which is tabled look-up, adjusts valve method and delivery temperature to table look-up tune valve method to adjust air-conditioning
The aperture of electric expansion valve.Wherein, it is the change for utilizing suction temperature and the difference and difference of coil temperature that the degree of superheat, which tables look-up and adjusts valve,
Change amount, which table look-up, adjusts valve.One of its disadvantage is that suction temperature and coil temperature are not much different, and difference is smaller, and degree of superheat precision is not
Enough, the problem of being susceptible to toning.In addition, due to air-conditioning because it uses capillary to shunt, shunting way is more, generally shunts road
The roads Shuo Wei 5-6 are relatively difficult to guarantee good shunting consistency in production fit on, therefore its coil temperature at runtime also is difficult to
Ensure good consistency, coil temperature deviation is larger, causes the degree of superheat to be tabled look-up and adjusts the precision of valve relatively low.Delivery temperature is tabled look-up tune
Although valve is more advantageous compared with degree of superheat tune valve, it adjusts valve precision relatively low, belongs to coarse adjustment, and is also easy to occur at low frequency
The problem of toning.
Invention content
The object of the present invention is to provide a kind of control methods of air conditioner electronic expansion valve, realize to electronic expansion valve opening
Dynamically, it quickly and accurately adjusts, improves the Energy Efficiency Ratio of the air conditioner coolant circulatory system.
For achieving the above object, the present invention is achieved using following technical proposals：
A kind of control method of air conditioner electronic expansion valve, including：
After compressor start operation, the actual motion frequency of compressor is obtained, is made comparisons with setting running frequency；
If the actual motion frequency is less than the setting running frequency, the aperture for controlling electric expansion valve is initially to open
Degree；Otherwise, the control process of initial operation stage tune valve is executed；
After the run time of compressor start operation reaches setting initial operating time, the control of PID tune valves is executed
Process；
The control process of the PID tune valve be using the difference of the actual exhaust air temperature of compressor and target exhaust temperature as
Deviation, the process for carrying out PID control to the aperture of electric expansion valve based on the deviation；The target exhaust temperature is according to
Actual motion frequency determines.
Control method as described above, which is characterized in that the target exhaust temperature is in line with the actual motion frequency
Sexual intercourse.
Control method as described above, the control process of the initial operation stage tune valve, specifically includes：
It is again started up in the first setting time after operation from dormant state in compressor, according to formula Y1=a1*f+b1
The target aperture Y1 for obtaining electric expansion valve, the aperture for controlling electric expansion valve are the target aperture Y1；The f is compressor
Actual motion frequency, a1 and b1 are constant；
The compressor is again started up operation from dormant state：
Compressor starts operation after the power is turned on again；Or
Compressor start is run after air-conditioning work pattern changes；Or
Compressor start is run after air-conditioner defrosting.
Control method as described above, the control process of the initial operation stage tune valve further include：
Compressor by room temperature close to target set temperature and the state shut down switchs to room temperature and deviates the goal-setting temperature
It spends in the state of being again started up, is again started up in the second setting time after operation in compressor, according to formula Y2=a2*f
+ b2+c2 obtains the target aperture Y2 of electric expansion valve, and the aperture for controlling electric expansion valve is the target aperture Y2；Wherein, a2
It is constant with b2, electric expansion valve actually opens when c2 is shut down by room temperature close to the target set temperature according to compressor
It spends and is determined with the actual motion frequency of compressor.
Preferably, first setting time is more than second setting time.
Control method as described above, during the control of the initial operation stage tune valve, to set the sampling period
The actual motion frequency of compressor is sampled, and calculates the change of the actual motion frequency of the compressor of front and back double sampling
Change；If the variation of the actual motion frequency is not more than setpoint frequency changing value, keep the target aperture of electric expansion valve constant；
Otherwise, the target aperture of electric expansion valve is obtained according to the actual motion frequency of compressor.
Control method as described above further includes：
After compressor re-powers, the aperture for first controlling electric expansion valve is maximum allowable aperture, then controls electronics
The aperture of expansion valve is the initial opening, then, after meeting compressor start condition, control compressor start operation.
Control method as described above keeps the currently practical of electric expansion valve to open in compressor shutdown and non-power down
It spends constant and continues to set the duration, when the duration reaching the setting duration, first control electric expansion valve
Aperture is maximum allowable aperture, and then, the aperture for controlling electric expansion valve is the initial opening, and is kept.
Control method as described above further includes：
The aperture of electric expansion valve is judged whether in the allowable range that maximum allowable aperture and minimum allowable aperture limit,
If it is not, the aperture of control electric expansion valve is the maximum allowable aperture or the minimum allowable aperture.
Compared with prior art, the advantages and positive effects of the present invention are：Electronic expansion valve controls side provided by the invention
Method, after compressor start, the aperture of electric expansion valve is adjusted to one by the control for first passing through execution initialization operation phase tune valve
Aperture is determined, then using the aperture as starting aperture, again with the actual exhaust air temperature of compressor and the difference of target exhaust temperature
Carry out PID control as deviation, based on deviation to the aperture of electric expansion valve, realize the dynamic to electronic expansion valve opening,
The problem of quickly and accurately adjusting, be less prone to toning；Moreover, in PID control, it is real-time according to compressor actual motion frequency
Determine target exhaust temperature so that PID control is subtleer, more acurrate, and can improve the air conditioner coolant circulatory system as much as possible
Energy Efficiency Ratio.
After the specific implementation mode of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more clear
Chu.
Description of the drawings
Fig. 1 is the flow chart of control method one embodiment of air conditioner electronic expansion valve of the present invention.
Specific implementation mode
Technical scheme of the present invention is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is referred to, which show the flow chart of control method one embodiment of air conditioner electronic expansion valve of the present invention,
Specifically, it is the flow chart of the one embodiment controlled the electronic expansion valve opening in the air conditioner coolant circulatory system.
As shown in Figure 1, the method that the embodiment realizes electronic expansion valve opening control includes the following steps：
Step 11：After compressor start operation, the actual motion frequency of compressor is obtained, makees ratio with setting running frequency
Compared with.
The actual motion frequency of compressor in the step refers to the real time execution frequency during compressor operating.By
In the running frequency of compressor controlled by the controller on air-conditioning computer plate, therefore, controller can be obtained easily
Actual motion frequency when the operation of compressor.Both then, actual motion frequency is made comparisons with setting running frequency, compare
Size.Wherein, setting running frequency is the frequency values for pre-setting and storing on air conditioner computer board.In general,
Minimum running frequency when referring to compressor normal operation.For example, being 10Hz or 15Hz.
Step 12：Judge whether the actual motion frequency of compressor is less than setting running frequency.If so, executing step 13；
Otherwise, step 14 is executed.
Step 13：If step 12 judges that the actual motion frequency of compressor is less than setting running frequency, control electronics is swollen
The aperture of swollen valve is initial opening.Then, step 15 is gone to.
Initial opening is the opening value for pre-setting and being stored in air conditioner computer board, is that air-conditioning research staff borrows
Help knowwhy and a large amount of experimental test, the value for determining and being written in air conditioner computer board before product export.Generally
, which should not be too large, also unsuitable too small, can to facilitate carrying out aperture regulation on the basis of initial opening
Guarantee fast implements the aperture regulation of expansion valve, and may be implemented accurately to adjust.For example, for a standard-sized sheet or fully closed
Aperture is the electric expansion valve of 540 pulses, and initial opening may be configured as 300 pulses or so.
If the actual motion frequency of compressor be less than setting running frequency, show compressor be in just start, frequency
The stage of rising.During being somebody's turn to do, compressor frequency changes greatly, if directly adjusting opening for electric expansion valve according to compressor frequency
Degree, then aperture fluctuation is also big, is difficult to control.Therefore, in the case, forced electronic expansion valve is opened with initial opening.Then,
Execute step 15.
Step 14：If step 12 judges that the actual motion frequency of compressor not less than setting running frequency, executes initial
The control process of operation phase tune valve.Then, step 15 is gone to.
If the actual motion frequency of compressor executes initial launch not less than setting running frequency to improve Energy Efficiency Ratio
The control process of stage tune valve.Then, step 15 is executed.
Step 15：Judge whether the run time of compressor start operation reaches setting initial operating time.If so, executing
Step 16；Otherwise, step 12 is gone to, step 12 and the corresponding processing procedure of follow-up step are continued to execute.
In this embodiment, be arranged timer, to compressor start run time carry out timing, and according to timing time,
Namely whether compressor start run time reaches setting initial operating time as the judgement determined whether into PID control
Foundation.Wherein, setting initial operating time is also the time value for pre-setting and storing.Moreover, setting initial operating time can
Can be a value, it is also possible to multiple values.The case where for multiple values, please refers to following description.
Step 16：If the time of compressor start operation reaches setting initial operating time, the control of PID tune valves is executed
Journey.
If the time of compressor start operation has reached setting initial operating time, enter the control of PID tune valves
Journey.Specifically, the control process of PID tune valve be using the difference of the actual exhaust air temperature of compressor and target exhaust temperature as
Deviation, the process for carrying out PID control to the aperture of electric expansion valve based on deviation.Wherein, the actual exhaust air temperature of compressor is
Real time exhaust gas temperature during compressor operating can be detected by the way that temperature sensor is arranged in exhaust outlet of compressor；Mesh
Mark delivery temperature refers to the delivery temperature for it is expected to reach, and is determined in real time according to the actual motion frequency of compressor.For example, in advance
The corresponding table for being first arranged and storing compressor operating frequency with target exhaust temperature, a frequency band correspond to a target exhaust temperature
Degree.During PID control, is tabled look-up, found corresponding to current compressor running frequency according to compressor real time execution frequency
Target exhaust temperature.Embodiment more preferably, target exhaust temperature and compressor real time execution frequency are linear,
It is expressed as with formula：Td=k*f+n.Wherein, k and n is constant that is known, having prestored, and f is compressor real time execution frequency
Rate.Target exhaust temperature is determined according to the linear relationship of compressor real time execution frequency, can obtain maximum air-conditioning efficiency
Than.
The target exhaust temperature of compressor determines that the actual exhaust air temperature of compressor can detect in real time by the above method
And obtain, moreover, with compressor start run time reach setting initial operating time, into PID tune valves control process when
Electronic expansion valve opening is initial opening value, then, pid control algorithm may be used, execute with the actual exhaust air temperature of compressor
And PID tune valve of the difference of target exhaust temperature as deviation, using target exhaust temperature as control targe controls.Based on deviation
The specific method for executing PID control is the prior art, is not described in more detail, can be realized with reference to the prior art herein.
The aperture of electric expansion valve is controlled by using PID tune valve, control is accurate, avoids the occurrence of overshoot.Moreover, not
It is immediately performed PID control in compressor start, but after compressor start run time reaches setting initial operating time
PID control is executed again, can make the aperture fast lifting of electric expansion valve, improves operational efficiency, and improve air conditioner coolant and follow
The Energy Efficiency Ratio of loop system.
In air-conditioning, there are many conditions of compressor start, and for example, compressor starts operation after the power is turned on again；Air-conditioning man
Operation mode changes（For example, switching to heating mode by refrigeration mode）So that compressor, which is first shut down, restarts operation；Air-conditioner defrosting knot
Compressor start is run after beam；Room temperature close to after target set temperature compressor shutdown, indoors deviate target set temperature after
Compressor start is run（Compressor start is run in the case of i.e. temperature sensing sensor turns ON by OFF）, etc..To electric expansion valve
During being controlled, preferably starts operation at different conditions according to compressor and execute different initial operation stage tune valves
Control.
Specifically, it is divided into two kinds of situations, it is as follows：
Compressor start operation or air-conditioning after by compressor, startup operation or air-conditioning work pattern change after the power is turned on again
Compressor start operation is defined as compressor and is again started up operation from dormant state after defrosting, if compressor is from suspend mode
State is again started up operation, and during the control of initial operation stage tune valve, first after compressor start operation sets
In fixing time, the target aperture Y1 of electric expansion valve is obtained according to formula Y1=a1*f+b1, the aperture for controlling electric expansion valve is
Target aperture Y1.Wherein, f is the actual motion frequency namely real time execution frequency of compressor, and a1 and b1 are constant.Wherein,
One setting time, a1 and b1 are the given value for presetting and storing, and can be joined according to the performance of the air conditioner coolant circulatory system
It counts to determine.Preferably, the first setting time is 6min or so.
And if compressor be by room temperature close to target set temperature and the state shut down switchs to room temperature and deviates goal-setting
Temperature and the state being again started up, during the control of initial operation stage tune valve, after compressor is again started up operation
The second setting time in, the target aperture Y2 of electric expansion valve is obtained according to formula Y2=a2*f+b2+c2, controls electronic expansion
The aperture of valve is target aperture Y2.Wherein, the second setting time, a2 and b2 are constant, and c2 is approached according to compressor by room temperature
Target set temperature and the practical aperture of electric expansion valve and the actual motion frequency of compressor determine when shutting down.Moreover, a2
It can be equal with above-mentioned a1 and b1 with b2；Second setting time is less than the first setting time.For example, the first setting time is
6min, the second setting time are 3min.In the second situation, by increasing an aperture correction value c2, opened in compressor
The aperture of electric expansion valve can be quickly adjusted after dynamic to a larger opening, circulated with fast quick-recovery refrigerant.
During the control of the initial operation stage tune valve of above-mentioned two situations, the aperture and compressor of electric expansion valve are real
Border running frequency is at one-to-one linear relationship.To avoid in the case where compressor frequency variation is little frequently to expansion valve
Aperture is controlled and is had an adverse effect, embodiment more preferably, in the control process of initial operation stage tune valve
In, the actual motion frequency of compressor is sampled with setting the sampling period, and calculate the compressor of front and back double sampling
The variation of actual motion frequency.If the variation of actual motion frequency is not more than setpoint frequency changing value, electric expansion valve is kept
Target aperture it is constant；Otherwise, the target aperture of electric expansion valve is obtained according to the actual motion frequency of compressor.Wherein, if
Determine frequency change and is also known a numerical value.For example, setpoint frequency changing value is 2Hz, if compressor actual motion frequency
The variation of rate is not more than 2Hz, then it is the preceding aperture once determined according to compressor actual motion frequency to keep electric expansion valve；Such as
The variation of fruit compressor actual motion frequency is more than 2Hz, further according to above-mentioned formula and current compressor actual motion frequency meter
Calculate and update the aperture of electric expansion valve.
In addition, if compressor re-powers after being powered off, for ease of being uniformly controlled, first by the aperture of electric expansion valve
It resets, to carry out unified control.Specifically, after compressor re-powers, the aperture of electric expansion valve is first controlled
For maximum allowable aperture, then it is then initial opening is meeting compressor start condition to control the aperture of electric expansion valve（Such as
Room temperature deviates setting target temperature）Afterwards, control compressor start operation.After compressor start, then execute above-mentioned control.
If in the case of compressor shutdown and non-power down, keeps the currently practical aperture of electric expansion valve constant and hold
Continuous setting duration, such as persistently 2min.When the duration reaching the setting duration, the aperture of electric expansion valve is first controlled
For maximum allowable aperture, then, then it is initial opening to control the aperture of electric expansion valve, and is kept.The purpose done so, and
The aperture of electric expansion valve is maintained into a reference opening amount as much as possible, improves the rapidity and accuracy of aperture regulation.
Moreover, electronic expansion valve opening is excessive or too small to avoid occurring in special circumstances, in entire electric expansion valve
During control, the aperture of real-time judge electric expansion valve whether the permission limited in maximum allowable aperture and minimum allowable aperture
In range.If within the allowable range, controlling electric expansion valve according to realistic objective aperture；If within the allowable range, do not controlled
The aperture of electric expansion valve processed is maximum allowable aperture（When realistic objective aperture is more than maximum allowable aperture）Or minimum allowable
Aperture（When realistic objective aperture is less than maximum allowable aperture）.Wherein, maximum allowable aperture and minimum allowable aperture are known
, according to the performance parameter of the air conditioner coolant circulatory system determine value.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although with reference to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these are changed or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of control method of air conditioner electronic expansion valve, which is characterized in that the method includes：
After compressor start operation, the actual motion frequency of compressor is obtained, is made comparisons with setting running frequency；
If the actual motion frequency is less than the setting running frequency, the aperture for controlling electric expansion valve is initial opening；It is no
Then, the control process of initial operation stage tune valve is executed；
After the run time of compressor start operation reaches setting initial operating time, the control process of PID tune valves is executed；
The control process of the PID tune valve is using the difference of the actual exhaust air temperature of compressor and target exhaust temperature as partially
Difference, the process for carrying out PID control to the aperture of electric expansion valve based on the deviation；The target exhaust temperature is according to the reality
Border running frequency determines；
The control process of the initial operation stage tune valve, specifically includes：
It is again started up in the first setting time after operation from dormant state in compressor, is obtained according to formula Y1=a1*f+b1
The target aperture Y1 for obtaining electric expansion valve, the aperture for controlling electric expansion valve are the target aperture Y1；The f is compressor
Actual motion frequency, a1 and b1 are constant；
The compressor is again started up operation from dormant state：
Compressor starts operation after the power is turned on again；Or
Compressor start is run after air-conditioning work pattern changes；Or
Compressor start is run after air-conditioner defrosting.
2. control method according to claim 1, which is characterized in that the target exhaust temperature and actual motion frequency
Rate is in a linear relationship.
3. control method according to claim 1, which is characterized in that the control process of the initial operation stage tune valve,
Further include：
Compressor by room temperature close to target set temperature and the state shut down switch to room temperature deviate the target set temperature and
In the state of being again started up, it is again started up in the second setting time after operation in compressor, according to formula Y2=a2*f+b2
+ c2 obtains the target aperture Y2 of electric expansion valve, and the aperture for controlling electric expansion valve is the target aperture Y2；Wherein, a2 and
B2 is constant, the practical aperture of electric expansion valve when c2 is shut down by room temperature close to the target set temperature according to compressor
It is determined with the actual motion frequency of compressor.
4. control method according to claim 3, which is characterized in that first setting time is more than described second and sets
Time.
5. control method according to claim 1 or 3, which is characterized in that in the control of the initial operation stage tune valve
In the process, the actual motion frequency of compressor is sampled with setting the sampling period, and calculates the compression of front and back double sampling
The variation of the actual motion frequency of machine；If the variation of the actual motion frequency is not more than setpoint frequency changing value, electronics is kept
The target aperture of expansion valve is constant；Otherwise, the target aperture of electric expansion valve is obtained according to the actual motion frequency of compressor.
6. control method according to claim 1, which is characterized in that the method further includes：
After compressor re-powers, the aperture for first controlling electric expansion valve is maximum allowable aperture, then controls electronic expansion
The aperture of valve is the initial opening, then, after meeting compressor start condition, control compressor start operation.
7. control method according to claim 1, which is characterized in that in compressor shutdown and non-power down, keep electronics
The currently practical aperture of expansion valve is constant and continues to set the duration, when the duration reaching the setting duration,
First the aperture of control electric expansion valve is maximum allowable aperture, and then, the aperture for controlling electric expansion valve is the initial opening,
And it keeps.
8. control method according to claim 1, which is characterized in that the method further includes：
The aperture of electric expansion valve is judged whether in the allowable range that maximum allowable aperture and minimum allowable aperture limit, if
No, the aperture for controlling electric expansion valve is the maximum allowable aperture or the minimum allowable aperture.
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| CN106123419B (en) | 2016-07-04 | 2019-04-23 | 青岛海尔空调器有限总公司 | A method of control air conditioner electric expansion valve |
| CN106052215B (en) * | 2016-07-04 | 2019-07-23 | 青岛海尔空调器有限总公司 | The control method of outdoor machine of air-conditioner electronic expansion valve |
| CN106052231B (en) * | 2016-07-04 | 2019-05-31 | 青岛海尔空调器有限总公司 | The method for adjusting air conditioner electric expansion valve |
| CN110966710B (en) * | 2018-09-29 | 2021-05-11 | 青岛海尔空调器有限总公司 | Method and device for determining initial opening degree of electronic expansion valve of air conditioner |
| CN110966708B (en) * | 2018-09-29 | 2021-04-20 | 青岛海尔空调器有限总公司 | Method and device for determining initial opening degree of electronic expansion valve |
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| CN114484954B (en) * | 2022-03-09 | 2023-09-22 | 广东开利暖通空调股份有限公司 | Control method and control device of electronic expansion valve and air source heat pump system |
| CN114791151B (en) * | 2022-05-16 | 2023-11-24 | 美的集团武汉暖通设备有限公司 | Control method and device for electronic expansion valve of air conditioner, air conditioner and storage medium |
| CN115507572B (en) * | 2022-10-31 | 2023-07-04 | 宁波奥克斯电气股份有限公司 | Error detection method and device for electronic expansion valve, air conditioner and storage medium |
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