CN104110799A - Integrated control method and circuit for electronic expansion valve of air conditioner - Google Patents
Integrated control method and circuit for electronic expansion valve of air conditioner Download PDFInfo
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- CN104110799A CN104110799A CN201310211027.0A CN201310211027A CN104110799A CN 104110799 A CN104110799 A CN 104110799A CN 201310211027 A CN201310211027 A CN 201310211027A CN 104110799 A CN104110799 A CN 104110799A
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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
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- 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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Abstract
The invention is applicable to the field of air conditioner controlling and provides an integrated control method and circuit for an electronic expansion valve of an air conditioner. The method includes: calculating a first openness adjustment of the electronic expansion valve according to exhaust temperature; calculating a second opening adjustment and adjusting time of the electronic expansion valve according to superheat degree of return gas of a compressor; selecting one of the first opening adjustment and the second opening adjustment as a final opening adjustment of the electronic expansion valve according to size relationship between the first and second opening adjustments, correspondingly adjusting opening of the electronic expansion valve according to the final opening adjustment, and keeping the opening of the electronic expansion valve unchanged in an adjusting period of time. An effective control scheme is provided by combining a control method for superheat degree of the return gas of the compressor and a control method for target temperature of exhaust of the compressor; the defects of the existing two control methods can be overcome; quick response of the electronic expansion valve is achieved; control with optimal energy efficiency is achieved.
Description
Technical field
The invention belongs to air-conditioner control technology field, relate in particular to a kind of integrated control method and circuit of air-conditioner electric expansion valve.
Background technology
The compressor operating frequency of frequency-conversion air-conditioning system can automatically adjust according to the conversion of room temperature, to reach the effect of minimum temperature fluctuation, best comfort and maximum energy-saving.In the time that compressor operating frequency is adjusted, the closed circuit cold medium flux of air-conditioning system also changes thereupon, at this moment just needs adjusted in concert electronic expansion valve opening, realizes best efficiency control.
The most frequently used control method of air-conditioning system electric expansion valve comprises compressor return air degree of superheat control method and compressor air-discharging target temperature control method at present.But all there is certain shortcoming and the blind area of control in these two kinds of methods.Such as, in the time that compressor exhaust temperature is very high, compressor return air degree of superheat control method cannot realize the best efficiency of system; And in frosting transient, the control of compressor air-discharging target temperature is sent out also cannot realize best efficiency control; In the time of indoor air velocity and/or the change of outdoor wind speed, compressor air-discharging target temperature controlling party cannot respond fast, also cannot realize best efficiency control, needs just can reach best efficiency control after longer a period of time of wait simultaneously.
In sum, how in conjunction with the pluses and minuses of frequency-conversion air-conditioning system compressor return air degree of superheat control method and exhaust target temperature control method, design a kind of novel air-conditioning system control method for electronic expansion valve, overcome shortcoming and the blind area of existing control method, realizing the energy-saving effect under all states, is current problem in the urgent need to address.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of integrated control method and circuit of air-conditioner electric expansion valve, be intended to solve existing compressor return air degree of superheat control method and compressor air-discharging target temperature control method all exists certain the blind area of control, cannot under total state, can arrive the technical problem of good energy-saving effect.
On the one hand, the integrated control method of described air-conditioner electric expansion valve comprises:
Poor according to target exhaust temperature, actual exhaust air temperature computation delivery temperature, and in conjunction with the first aperture adjustment amount of the poor calculating electric expansion valve of delivery temperature previously once calculating;
Determine return-air degree of superheat target initial value, and calculate current return-air degree of superheat deviation according to the current return-air degree of superheat, and determine the second aperture adjustment amount and the adjustment time of electric expansion valve in conjunction with the return-air degree of superheat deviation previously once calculating;
Select the final aperture adjustment amount of one of them aperture adjustment amount as electric expansion valve according to the magnitude relationship of described the first aperture adjustment amount and the second aperture adjustment amount, according to the corresponding aperture of adjusting electric expansion valve of described final aperture adjustment amount, and it is constant within the described adjustment time, to maintain the aperture of electric expansion valve.
On the other hand, the integrated control circuit of described air-conditioner electric expansion valve comprises:
Return-air degree of superheat control module, for poor according to target exhaust temperature, actual exhaust air temperature computation delivery temperature, and in conjunction with the first aperture adjustment amount of the poor calculating electric expansion valve of delivery temperature previously once calculating;
Exhaust control module, for determining return-air degree of superheat target initial value, and calculate current return-air degree of superheat deviation according to the current return-air degree of superheat, and determine the second aperture adjustment amount and the adjustment time of electric expansion valve in conjunction with the return-air degree of superheat deviation previously once calculating;
Collaborative arbitration modules, for selecting the final aperture adjustment amount of one of them aperture adjustment amount as electric expansion valve according to the magnitude relationship of described the first aperture adjustment amount and the second aperture adjustment amount, according to the corresponding aperture of adjusting electric expansion valve of described final aperture adjustment amount, and it is constant within the described adjustment time, to maintain the aperture of electric expansion valve.
The present invention combines compressor return air degree of superheat control method and compressor air-discharging target temperature control method, calculate respectively the first aperture adjustment amount and the second aperture adjustment amount of electric expansion valve according to contracting machine return-air degree of superheat control method and compressor air-discharging target temperature control method, then select the final aperture adjustment amount of one of them aperture adjustment amount as electric expansion valve according to the magnitude relationship of the first aperture adjustment amount and the second aperture adjustment amount, again according to the corresponding aperture of adjusting electric expansion valve of described final aperture adjustment amount, the technology of the present invention provides a kind of control program of best results, can overcome the shortcoming and defect of existing two kinds of control methods, realizing electric expansion valve responds fast, realize best efficiency control effect, reach energy-conservation object.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the integrated control method of the air-conditioner electric expansion valve that provides of the embodiment of the present invention;
Fig. 2 is a kind of realization flow figure of step S1 in Fig. 1;
Fig. 3 is the graph of relation of compressor operating frequency and target exhaust temperature;
Fig. 4 is a kind of realization flow figure of step S2 in Fig. 1;
Fig. 5 is a kind of realization flow figure of step S3 in Fig. 1;
Fig. 6 is the another kind of flow chart of the integrated control method of the air-conditioner electric expansion valve that provides of the embodiment of the present invention;
Fig. 7 is a kind of structure chart of the integrated control circuit of the air-conditioner electric expansion valve that provides of the embodiment of the present invention;
Fig. 8 is the another kind of structure chart of the integrated control circuit of the air-conditioner electric expansion valve that provides of the embodiment of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows a kind of flow process of the integrated control method of the air-conditioner electric expansion valve that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the present embodiment, as shown in the figure:
The integrated control method of the air-conditioner electric expansion valve that this enforcement provides comprises:
Step S1, poor according to target exhaust temperature, actual exhaust air temperature computation delivery temperature, and in conjunction with the first aperture adjustment amount of the poor calculating electric expansion valve of delivery temperature previously once calculating.
When specific implementation, with reference to Fig. 2, described step S1 comprises:
Step S101, obtain target exhaust temperature Td0 according to the relation curve of compressor operating frequency and target exhaust temperature.
As a kind of embodiment, the relation curve of described compressor operating frequency and target exhaust temperature as shown in Figure 3, getting after the running frequency of compression, query graph 3, can obtain corresponding target exhaust temperature, in the present embodiment, preferably, described target exhaust temperature value within the specific limits, such as line as shown in Figure 3, in the time that compressor operating frequency is less than 10Hz, target exhaust temperature is 45 DEG C, in the time that compressor operating frequency is greater than 95Hz, target exhaust temperature is 95 DEG C, in the time that compressor operating frequency is between 10Hz～95Hz, target exhaust temperature linear increment, it should be noted that, curve shown in Fig. 3 is that a kind of example is enumerated, curve shown in being not limited in practical application.
Step S102, obtain the compressor actual exhaust air temperature T d that compressor exhaust temperature sensor is uploaded.
Refrigeration compressor ventilating hole goes out to be provided with exhaust gas temperature sensor, can obtain the actual exhaust air temperature T d of compressor by described exhaust gas temperature sensor.
Step S103, calculate the poor TD=Td-Td0 of current delivery temperature, and in conjunction with the poor TD ' of delivery temperature previously once calculating, calculate the poor variable quantity △ of delivery temperature TD=TD-TD '.
Preferably, the poor TD of described delivery temperature has a default temperature difference scope [TDmin, TDmax], in the time that TD is less than the lower limit-TDmin of described temperature difference scope, TD is modified to the lower limit-TDmin of described temperature difference scope, in the time that TD is greater than the higher limit TDmax of described temperature difference scope, TD is modified to the higher limit TDmax of described temperature difference scope.
Preferably, the poor variable quantity △ of described delivery temperature TD has a default variable quantity scope [△ Tdmin, △ Tdmax], in the time that △ TD is less than lower limit-△ Tdmin of described variable quantity scope, △ TD is modified to lower limit-△ Tdmin of described variable quantity scope, when described △ TD is greater than the higher limit △ Tdmax of described variable quantity scope, △ TD is modified to the higher limit △ Tdmax of described variable quantity scope.
In the present embodiment, poor described delivery temperature TD and/or the poor variable quantity △ of delivery temperature TD are limited within limits, can avoid finding fortuitous event and making the value of TD and/or the △ TD situation that obviously loses contact with reality due to air-conditioning system, and the control electric expansion valve that makes the mistake.
The first aperture adjustment amount △ PMVtd=G × { (1-Kp) × TD+Kp × △ Td } of step S104, calculating electric expansion valve, wherein G is gain coefficient, Kp is for adjusting coefficient.
In the present embodiment, the value of G, Kp can be set according to air-conditioning system, such as, the span of G is [1,5], the span of Kp is [0.1,0.9], in the present embodiment, preferred.G=5，Kp=0.4。
Step S2, determine return-air degree of superheat target initial value, and calculate current return-air degree of superheat deviation according to the current return-air degree of superheat, and determine the second aperture adjustment amount and the adjustment time of electric expansion valve in conjunction with the return-air degree of superheat deviation previously once calculating.
When specific implementation, with reference to Fig. 4, described step S2 specifically comprises:
Step S201, determine return-air degree of superheat target initial value TSH0 according to the present mode of operation of air-conditioner and compressor operating frequency.
In the present embodiment, the present mode of operation of described air-conditioner comprises refrigeration mode, heating mode, dehumidifier pattern etc., in this step, determines return-air degree of superheat target initial value TSH0 according to present mode of operation and compressor operating frequency.
Step S202, calculate current return-air degree of superheat TSH, and calculate current return-air degree of superheat deviation SH=TSH-TSH0 in conjunction with described return-air degree of superheat target initial value TSH0, according to the return-air degree of superheat deviation SH ' previously once calculating, calculate return-air degree of superheat change of error amount △ SH=SH-SH ';
In the present embodiment, before described calculating, return-air degree of superheat TSH method is as follows,
When heating mode: TSH=TS-T3;
When refrigeration, dehumidifier pattern: TSH=TS-T2;
Wherein, TS is compressor return air temperature value, and T3 is outdoor condenser temperature value, and T2 is indoor evaporator temperature value.
Preferably, described return-air degree of superheat deviation SH has a default deviation range, such as in [6,6] scope, in the time that SH is less than the lower limit of described deviation range, be SH<-6, SH be modified to the lower limit of described deviation range, i.e. SH=-6, in the time that SH is greater than the higher limit of described deviation range, be SH>6, SH be modified to the higher limit of described deviation range, i.e. SH=6.
Preferably, described return-air degree of superheat change of error amount △ SH has a default change of error weight range, such as in [3,3] scope, in the time that △ SH is less than the lower limit of described change of error weight range, be △ SH<-3, △ SH be modified to the lower limit of described change of error weight range, i.e. △ SH=-3, in the time that △ SH is greater than the higher limit of described change of error weight range, be △ SH>3, △ SH is modified to the higher limit of described change of error weight range, i.e. △ SH=3.
In like manner, the present embodiment can limit return-air degree of superheat deviation SH and/or return-air degree of superheat change of error amount △ SH within the specific limits equally.
Step S203, determine the second aperture adjustment amount △ PMVsh of electric expansion valve and adjust time △ TIME according to described return-air degree of superheat deviation SH and return-air degree of superheat change of error amount △ SH.
As a kind of implementation, 1 inquiry obtains according to following table for described △ PMVsh and △ TIME, especially, it should be noted that electric expansion valve the second adjustment amount and adjustment time that following table 1 just records according to actual conditions, for the performance of different air-conditioners, can do adaptability revision to following table.For example, be-2 if SH is 2, △ SH, this △ PMVsh adjustment amount is-1 step, adjusting the time interval is 8 seconds.Be listed as follows:
Table 1
Step S3, select the final aperture adjustment amount of one of them aperture adjustment amount as electric expansion valve according to the magnitude relationship of described the first aperture adjustment amount and the second aperture adjustment amount, according to the corresponding aperture of adjusting electric expansion valve of described final aperture adjustment amount, and it is constant within the described adjustment time, to maintain the aperture of electric expansion valve.
This step determines to select the final aperture adjustment amount △ PMV of one of them aperture adjustment amount as electric expansion valve according to the magnitude relationship of the first aperture adjustment amount △ PMVtd and the second aperture adjustment amount △ PMVsh, calculate the target aperture PMV=PMVnow+ △ PMV of electric expansion valve, the current aperture that wherein PMVnow is electric expansion valve, then adjust the aperture of electric expansion valve to described target aperture PMV, and continue described adjustment time △ TIME, then enter next round control.
Preferably, when specific implementation, with reference to Fig. 5, described step S3 comprises:
Step S301, in the time that described the first aperture adjustment amount △ PMVtd is greater than 0, select the △ PMVtd final aperture adjustment amount △ PMV as electric expansion valve, otherwise select the final aperture adjustment amount △ PMV of the second aperture adjustment amount △ PMVsh as electric expansion valve.
This step is the concrete selection mode of one of final aperture adjustment amount △ PMV, this example includes but not limited to this, such as selecting like this: in the time that described the first aperture adjustment amount △ PMVtd is more than or equal to 0, select the final aperture adjustment amount △ PMV of △ PMVtd as electric expansion valve, otherwise select the final aperture adjustment amount △ PMV of the second aperture adjustment amount △ PMVsh as electric expansion valve, the present embodiment will not enumerate.
The target aperture PMV=PMVnow+ △ PMV of step S302, calculating electric expansion valve, the current aperture that wherein PMVnow is electric expansion valve.
Because the aperture of electric expansion valve can not be infinitely great, therefore the target aperture PMV of electric expansion valve is limited to a default aperture scope by this preferred embodiment, ensure that the target aperture of electric expansion valve is all the time in a suitable scope, preferably, the target aperture PMV of described electric expansion valve has a default aperture scope, in the time that PMV is less than the lower limit of described aperture scope, PMV is modified to the lower limit of described aperture scope, in the time that PMV is greater than the higher limit of described aperture scope, PMV is modified to the higher limit of described aperture scope.Such as the span of the target aperture PMV that supposes electric expansion valve is [60,500], in the time that being less than 60, PMV PMV is modified to 60, in the time that being greater than 500, PMV PMV is modified to 500.
Step S303, the aperture of electric expansion valve is adjusted to PMV, and the aperture of position electric expansion valve is constant in described adjustment time △ TIME.
Finally, especially, it should be noted that, the present embodiment does not limit the execution sequence of step S1 and step S2, and two steps can be carried out simultaneously or successively carry out.As a kind of implementation, in Fig. 1, step S1 first carries out, and carry out, but obvious two steps can carry out simultaneously, or step S2 first carries out after step S2, after step S1, carries out, and the present embodiment repeats no more.
Fig. 6 shows the another kind of flow process of the integrated control method of the air-conditioner electric expansion valve that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the present embodiment, as shown in the figure:
The integrated control method of the air-conditioner electric expansion valve that this enforcement provides comprises:
Step S0, air-conditioner enter after expection operational mode, initialize the aperture of electric expansion valve and keep a period of time.
Described expection operational mode comprises refrigeration mode, heating mode and dehumidifier pattern, only has when air-conditioning is during in these operational modes, just carries out the aperture control of the electric expansion valve that the present embodiment provides.When air-conditioning enters after expection operational mode, initialize the aperture PMV0 of electric expansion valve and keep a period of time TIME0.As specific implementation, described PMV0, TIME0 value can be with reference to following tables 2:
| Operational mode | PMV0 aperture | The TIME0 time |
| Refrigeration | 160 steps | 120 seconds |
| Dehumidifying | 160 steps | 120 seconds |
| Heat | 130 steps | 120 seconds |
Table 2
The concrete condition that described air-conditioning enters expection operational mode can comprise: when user opens after air-conditioner, air-conditioner enters expection mode of operation automatically, or when user changes the operational mode of air-conditioner by remote controller, also can be for when air-conditioner something unexpected happened the situation, reset is restarted and is entered expection operational mode.
Step S1, poor according to target exhaust temperature, actual exhaust air temperature computation delivery temperature, and in conjunction with the first aperture adjustment amount of the poor calculating electric expansion valve of delivery temperature previously once calculating;
Step S2, determine return-air degree of superheat target initial value, and calculate current return-air degree of superheat deviation according to the current return-air degree of superheat, and determine the second aperture adjustment amount and the adjustment time of electric expansion valve in conjunction with the return-air degree of superheat deviation previously once calculating;
Step S3, select the final aperture adjustment amount of one of them aperture adjustment amount as electric expansion valve according to the magnitude relationship of described the first aperture adjustment amount and the second aperture adjustment amount, according to the corresponding aperture of adjusting electric expansion valve of described final aperture adjustment amount, and it is constant within the described adjustment time, to maintain the aperture of electric expansion valve.
Above-mentioned steps S1-S3 is same as the previously described embodiments, repeats no more herein.
The integrated control method of the air-conditioner electric expansion valve that preferably, this enforcement provides also comprises:
Step S4, obtain the present mode of operation of air-conditioner, in the time that not changing, the operational mode of described air-conditioner returns to step S1, in the time that the operational mode of described air-conditioner changes but still belongs to expection operational mode, return to step S0, in the time that the operation mould of described air-conditioner changes and do not belong to expection operational mode, the described electric expansion valve that resets, finishing control.
For the ease of being described in the drawings, when specific implementation, described step S401 comprises:
Step S401, obtain the present mode of operation of air-conditioner;
Step S402, judge that whether the operational mode of described air-conditioner changes, and returns to step S1 in the time that described operational mode does not change;
Step S403, in the time that changing, described operational mode judges that whether described operational mode belongs to described expection operational mode, in the time belonging to described expection operational mode, returns to step S0;
Step S404, do not belong to expection when operational mode, the described electric expansion valve that resets, finishing control when described operational mode.
The present embodiment previous embodiment basis on increased step S0, further increased step S4, the present embodiment is considered the actual operational mode of air-conditioner, and makes corresponding control, and a kind of more complete electronic expansion valve controls scheme is provided.
Fig. 7 shows a kind of structure of the integrated control circuit of the air-conditioner electric expansion valve that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the present embodiment, as shown in the figure:
The integrated control circuit of the air-conditioner electric expansion valve that this enforcement provides comprises:
Return-air degree of superheat control module 701, for poor according to target exhaust temperature, actual exhaust air temperature computation delivery temperature, and in conjunction with the first aperture adjustment amount of the poor calculating electric expansion valve of delivery temperature previously once calculating;
Exhaust control module 702, for determining return-air degree of superheat target initial value, and calculate current return-air degree of superheat deviation according to the current return-air degree of superheat, and determine the second aperture adjustment amount and the adjustment time of electric expansion valve in conjunction with the return-air degree of superheat deviation previously once calculating;
Collaborative arbitration modules 703, for selecting the final aperture adjustment amount of one of them aperture adjustment amount as electric expansion valve according to the magnitude relationship of described the first aperture adjustment amount and the second aperture adjustment amount, according to the corresponding aperture of adjusting electric expansion valve of described final aperture adjustment amount, and it is constant within the described adjustment time, to maintain the aperture of electric expansion valve.
Preferably, described return-air degree of superheat control module 701 specifically comprises:
Target exhaust temperature acquiring unit, for obtaining target exhaust temperature Td0 according to the relation curve of compressor operating frequency and target exhaust temperature;
Actual exhaust air temperature acquiring unit, the compressor actual exhaust air temperature T d uploading for obtaining compressor exhaust temperature sensor;
The poor variable quantity acquiring unit of delivery temperature, for calculating the poor TD=Td-Td0 of current delivery temperature, and in conjunction with the poor TD ' of delivery temperature previously once calculating, calculates the poor variable quantity △ of delivery temperature TD=TD-TD ';
The first aperture adjustment amount acquiring unit, for calculating the first aperture adjustment amount △ PMVtd=G × { (1-Kp) × TD+Kp × △ Td } of electric expansion valve, wherein G is gain coefficient, Kp is for adjusting coefficient.
Preferably, the poor TD of described delivery temperature has a default temperature difference scope, in the time that TD is less than the lower limit of described temperature difference scope, TD is modified to the lower limit of described temperature difference scope, in the time that TD is greater than the higher limit of described temperature difference scope, TD is modified to the higher limit of described temperature difference scope; And/or, the poor variable quantity △ of described delivery temperature TD has a default variable quantity scope, in the time that △ TD is less than the lower limit of described variable quantity scope, △ TD is modified to the lower limit of described variable quantity scope, when described △ TD is greater than the higher limit of described variable quantity scope, △ TD is modified to the higher limit of described variable quantity scope.
Preferably, exhaust control module 702 specifically comprises:
Return-air degree of superheat target initial value acquiring unit, for determining return-air degree of superheat target initial value TSH0 according to the present mode of operation of air-conditioner and compressor operating frequency;
Return-air degree of superheat change of error amount acquiring unit, be used for calculating current return-air degree of superheat TSH, and calculate current return-air degree of superheat deviation SH=TSH-TSH0 in conjunction with described return-air degree of superheat target initial value TSH0, according to the return-air degree of superheat deviation SH ' previously once calculating, calculate return-air degree of superheat change of error amount △ SH=SH-SH ';
The second aperture adjustment amount acquiring unit, for determining the second aperture adjustment amount △ PMVsh of electric expansion valve and adjust time △ TIME according to described return-air degree of superheat deviation SH and return-air degree of superheat change of error amount △ SH.
Preferably, described return-air degree of superheat deviation SH has a default deviation range, in the time that SH is less than the lower limit of described deviation range, SH is modified to the lower limit of described deviation range, in the time that SH is greater than the higher limit of described deviation range, SH is modified to the higher limit of described deviation range; And/or, described return-air degree of superheat change of error amount △ SH has a default change of error weight range, in the time that △ SH is less than the lower limit of described change of error weight range, △ SH is modified to the lower limit of described change of error weight range, in the time that △ SH is greater than the higher limit of described change of error weight range, △ SH is modified to the higher limit of described change of error weight range.
Preferably, described collaborative arbitration modules 703 specifically comprises:
Final aperture adjustment amount determining unit, for in the time that described the first aperture adjustment amount △ PMVtd is greater than 0, select the final aperture adjustment amount △ PMV of △ PMVtd as electric expansion valve, otherwise select the final aperture adjustment amount △ PMV of the second aperture adjustment amount △ PMVsh as electric expansion valve;
Target aperture acquiring unit, for calculating the target aperture PMV=PMVnow+ △ PMV of electric expansion valve, the current aperture that wherein PMVnow is electric expansion valve.
Preferably, the target aperture PMV of described electric expansion valve has a default aperture scope, in the time that PMV is less than the lower limit of described aperture scope, PMV is modified to the lower limit of described aperture scope, in the time that PMV is greater than the higher limit of described aperture scope, PMV is modified to the higher limit of described aperture scope;
Electronic expansion valve opening adjustment unit, for the aperture of electric expansion valve is adjusted to PMV, and the aperture of position electric expansion valve is constant in described adjustment time △ TIME.
Fig. 8 shows the another kind of structure of the integrated control circuit of air-conditioner electric expansion valve, then on the basis of Fig. 7, described air-conditioner electronic expansion valve controls circuit also comprises:
Initialization module 700, for entering at air-conditioner after expection operational mode, initializes the aperture of electric expansion valve and keeps a period of time.
Preferably, described total integrated control circuit also comprises:
Operational mode judgement operation module 704, for obtaining the present mode of operation of air-conditioner, in the time that not changing, the operational mode of described air-conditioner moves described return-air degree of superheat correction value determination module, in the time that the operational mode of described air-conditioner changes but still belongs to expection operational mode, move described electric expansion valve initialization module, in the time that the operation mould of described air-conditioner changes and do not belong to expection operational mode, the described electric expansion valve that resets, finishing control.
To sum up, each embodiment provided by the invention and preferred embodiment are according to compressor return air degree of superheat control method and compressor air-discharging target temperature control method, a kind of integrated approach of air-conditioner electric expansion valve is provided, can overcome the shortcoming and defect of existing control method, realize electric expansion valve and respond fast, realize best efficiency control effect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, although the present invention has been carried out to more detailed explanation with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified or part technical characterictic is wherein equal to replacement.All any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. an integrated control method for air-conditioner electric expansion valve, is characterized in that, described method comprises:
Step S1, poor according to target exhaust temperature, actual exhaust air temperature computation delivery temperature, and in conjunction with the first aperture adjustment amount of the poor calculating electric expansion valve of delivery temperature previously once calculating;
Step S2, determine return-air degree of superheat target initial value, and calculate current return-air degree of superheat deviation according to the current return-air degree of superheat, and determine the second aperture adjustment amount and the adjustment time of electric expansion valve in conjunction with the return-air degree of superheat deviation previously once calculating;
Step S3, select the final aperture adjustment amount of one of them aperture adjustment amount as electric expansion valve according to the magnitude relationship of described the first aperture adjustment amount and the second aperture adjustment amount, according to the corresponding aperture of adjusting electric expansion valve of described final aperture adjustment amount, and it is constant within the described adjustment time, to maintain the aperture of electric expansion valve.
2. the integrated control method of air-conditioner electric expansion valve as claimed in claim 1, is characterized in that, before described step S1, also comprises:
Step S0, air-conditioner enter after expection operational mode, initialize the aperture of electric expansion valve and keep a period of time.
3. the integrated control method of air-conditioner electric expansion valve as claimed in claim 2, is characterized in that, after described step S3, also comprises:
Step S4, obtain the present mode of operation of air-conditioner, in the time that not changing, the operational mode of described air-conditioner returns to step S1, in the time that the operational mode of described air-conditioner changes but still belongs to expection operational mode, return to step S0, in the time that the operation mould of described air-conditioner changes and do not belong to expection operational mode, the described electric expansion valve that resets, finishing control.
4. the integrated control method of the air-conditioner electric expansion valve as described in claim 1-3 any one, is characterized in that, described step S1 specifically comprises:
Obtain target exhaust temperature Td0 according to the relation curve of compressor operating frequency and target exhaust temperature;
Obtain the compressor actual exhaust air temperature T d that compressor exhaust temperature sensor is uploaded;
Calculate the current poor TD=Td-Td0 of delivery temperature, and in conjunction with the poor TD ' of delivery temperature previously once calculating, calculate the poor variable quantity △ of delivery temperature TD=TD-TD ';
The first aperture adjustment amount △ PMVtd=G × { (1-Kp) × TD+Kp × △ Td } that calculates electric expansion valve, wherein G is gain coefficient, Kp is for adjusting coefficient.
5. the integrated control method of air-conditioner electric expansion valve as claimed in claim 4, is characterized in that:
The poor TD of described delivery temperature has a default temperature difference scope, in the time that TD is less than the lower limit of described temperature difference scope, TD is modified to the lower limit of described temperature difference scope, in the time that TD is greater than the higher limit of described temperature difference scope, TD is modified to the higher limit of described temperature difference scope; And/or,
The poor variable quantity △ of described delivery temperature TD has a default variable quantity scope, in the time that △ TD is less than the lower limit of described variable quantity scope, △ TD is modified to the lower limit of described variable quantity scope, when described △ TD is greater than the higher limit of described variable quantity scope, △ TD is modified to the higher limit of described variable quantity scope.
6. the integrated control method of air-conditioner electric expansion valve as claimed in claim 5, is characterized in that, described step S2 specifically comprises:
Determine return-air degree of superheat target initial value TSH0 according to the present mode of operation of air-conditioner and compressor operating frequency;
Calculate current return-air degree of superheat TSH, and calculate current return-air degree of superheat deviation SH=TSH-TSH0 in conjunction with described return-air degree of superheat target initial value TSH0, according to the return-air degree of superheat deviation SH ' previously once calculating, calculate return-air degree of superheat change of error amount △ SH=SH-SH ';
Determine the second aperture adjustment amount △ PMVsh of electric expansion valve and adjust time △ TIME according to described return-air degree of superheat deviation SH and return-air degree of superheat change of error amount △ SH.
7. the integrated control method of air-conditioner electric expansion valve as claimed in claim 6, is characterized in that:
Described return-air degree of superheat deviation SH has a default deviation range, in the time that SH is less than the lower limit of described deviation range, SH is modified to the lower limit of described deviation range, in the time that SH is greater than the higher limit of described deviation range, SH is modified to the higher limit of described deviation range; And/or,
Described return-air degree of superheat change of error amount △ SH has a default change of error weight range, in the time that △ SH is less than the lower limit of described change of error weight range, △ SH is modified to the lower limit of described change of error weight range, in the time that △ SH is greater than the higher limit of described change of error weight range, △ SH is modified to the higher limit of described change of error weight range.
8. the integrated control method of air-conditioner electric expansion valve as claimed in claim 7, is characterized in that, described step S3 specifically comprises:
In the time that described the first aperture adjustment amount △ PMVtd is greater than 0, selects the final aperture adjustment amount △ PMV of △ PMVtd as electric expansion valve, otherwise select the final aperture adjustment amount △ PMV of the second aperture adjustment amount △ PMVsh as electric expansion valve;
Calculate the target aperture PMV=PMVnow+ △ PMV of electric expansion valve, the current aperture that wherein PMVnow is electric expansion valve, the target aperture PMV of described electric expansion valve has a default aperture scope, in the time that PMV is less than the lower limit of described aperture scope, PMV is modified to the lower limit of described aperture scope, in the time that PMV is greater than the higher limit of described aperture scope, PMV is modified to the higher limit of described aperture scope;
The aperture of electric expansion valve is adjusted to PMV, and the aperture of position electric expansion valve is constant in described adjustment time △ TIME.
9. an integrated control circuit for air-conditioner electric expansion valve, is characterized in that, described integrated control circuit comprises:
Return-air degree of superheat control module, for poor according to target exhaust temperature, actual exhaust air temperature computation delivery temperature, and in conjunction with the first aperture adjustment amount of the poor calculating electric expansion valve of delivery temperature previously once calculating;
Exhaust control module, for determining return-air degree of superheat target initial value, and calculate current return-air degree of superheat deviation according to the current return-air degree of superheat, and determine the second aperture adjustment amount and the adjustment time of electric expansion valve in conjunction with the return-air degree of superheat deviation previously once calculating;
Collaborative arbitration modules, for selecting the final aperture adjustment amount of one of them aperture adjustment amount as electric expansion valve according to the magnitude relationship of described the first aperture adjustment amount and the second aperture adjustment amount, according to the corresponding aperture of adjusting electric expansion valve of described final aperture adjustment amount, and it is constant within the described adjustment time, to maintain the aperture of electric expansion valve.
10. the integrated control circuit of air-conditioner electric expansion valve as claimed in claim 9, is characterized in that, described integrated control circuit also comprises:
Initialization module, for entering at air-conditioner after expection operational mode, initializes the aperture of electric expansion valve and keeps a period of time.
The integrated control circuit of 11. air-conditioner electric expansion valves as claimed in claim 10, is characterized in that, described integrated control circuit also comprises
Operational mode judgement operation module, for obtaining the present mode of operation of air-conditioner, in the time that not changing, the operational mode of described air-conditioner moves described return-air degree of superheat correction value determination module, in the time that the operational mode of described air-conditioner changes but still belongs to expection operational mode, move described electric expansion valve initialization module, in the time that the operation mould of described air-conditioner changes and do not belong to expection operational mode, the described electric expansion valve that resets, finishing control.
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