CN102829590A - Control device of electronic expansion valve - Google Patents
Control device of electronic expansion valve Download PDFInfo
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- CN102829590A CN102829590A CN2012101890374A CN201210189037A CN102829590A CN 102829590 A CN102829590 A CN 102829590A CN 2012101890374 A CN2012101890374 A CN 2012101890374A CN 201210189037 A CN201210189037 A CN 201210189037A CN 102829590 A CN102829590 A CN 102829590A
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- 238000012937 correction Methods 0.000 claims abstract description 63
- 230000007246 mechanism Effects 0.000 claims abstract description 33
- 230000008520 organization Effects 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 20
- 230000008014 freezing Effects 0.000 claims description 2
- 238000007710 freezing Methods 0.000 claims description 2
- 238000005057 refrigeration Methods 0.000 abstract description 11
- 238000012545 processing Methods 0.000 description 29
- 230000009471 action Effects 0.000 description 28
- 230000008859 change Effects 0.000 description 21
- 238000001704 evaporation Methods 0.000 description 15
- 239000007788 liquid Substances 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
- F25B41/345—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by solenoids
- F25B41/347—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by solenoids with the valve member being opened and closed cyclically, e.g. with pulse width modulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/06—Details of flow restrictors or expansion valves
- F25B2341/068—Expansion valves combined with a sensor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Feedback Control In General (AREA)
Abstract
The invention provides a control device of an electronic expansion valve. The control device can control a valve opening degree of the electronic expansion valve of a refrigeration apparatus so as to enable an appropriate superheat degree and ensure mechanical life of the electronic expansion valve. A correction superheat setting value (SV') is output to a set value correcting mechanism (1) to a target value changing unit (22) and a target value changing control unit (23). A measuring unit (4) calculates a superheat degree of a control object (3) of the refrigeration apparatus, the control object containing refrigeration cycle, and outputs the measured superheat degree (PV) to a PID calculating unit (21). The target value changing unit changes the correction superheat setting value (SV') outputs as a target value to the PID calculating unit. The PID calculating unit calculates and supplies an operating amount signal MV to the control object. An output feedback of the operating amount signal MV output from a PID control mechanism is input to the set value correcting mechanism, and a target superheat degree relative to the PID calculating unit is corrected according to the operating amount signal MV.
Description
Technical field
The present invention relates to the electronic Expansion Valve Control device in the refrigerating plant, in detail, relate to the electronic Expansion Valve Control device of controlling the valve opening of electric expansion valve for the degree of superheat of adjusting refrigerating plant.
Background technology
In the past, as this control device, TOHKEMY 2009-156502 communique (patent documentation 1), the disclosed device of special fair 8-33244 communique (patent documentation 2) were for example arranged.
The technology of patent documentation 1 is; Change the constant of required value filter; No matter measure the situation that the degree of superheat is higher than the situation of degree of superheat setting value or is lower than degree of superheat setting value, the degree of superheat all can promptly be limited to setting value, the adjustment of the degree of superheat when being provided with refrigerating plant easily.In addition, the technology of patent documentation 2 is to keep watch on the variation of measuring the degree of superheat, revises the setting of the degree of superheat, always with the technology of the setting value running of the best.
The prior art document
Patent documentation 1: TOHKEMY 2009-156502 communique
Patent documentation 2: special fair 8-33244 communique
In the technology of patent documentation 1, adjusted degree of superheat setting value obtains the best degree of superheat and sets under the condition in the adjusted moment, and self-evident, this setting value all is optimum value under what kind of condition.Thereby; Under the situation of the adjustment that can't carry out degree of superheat setting value obligingly; Must improve degree of superheat setting value in advance, return running, leave problem aspect can not be always turning round thus with the degree of superheat of the best in order to avoid liquid is also proceeded in change such as condition, loading condiction in season.In other words, in order always to turn round with the degree of superheat of the best, each condition changes, and all essential change degree of superheat of user setting value leaves problem aspect loaded down with trivial details.
In addition; In the technology of patent documentation 2; Judge that degree of superheat setting value is lower and be adapted to higher during, the variation of the degree of superheat of vibration is imported into controller as control signal, therefore with it correspondingly; The action that electric expansion valve also vibrates is leaving problem aspect the reliability of electric expansion valve.
Summary of the invention
Problem of the present invention provides a kind of under the condition of various refrigerating plants, load, evaporator pressure, condenser pressure etc.; Can both realize turning round, and can not shorten the high electronic Expansion Valve Control device of mechanical life, reliability of electric expansion valve with the degree of superheat of the best.
Scheme one provides a kind of electronic Expansion Valve Control device; Electric expansion valve through to refrigerating plant is given the degree of superheat of controlling refrigerating plant with the operational ton signal; It is characterized in that; Possess: PID controlling organization, this PID controlling organization are according to the degree of superheat setting value of input and the mensuration degree of superheat of above-mentioned refrigerating plant, and output is to the operational ton signal of above-mentioned electric expansion valve; And setting value correction mechanism; The value of feedback of the aforesaid operations amount signal of this setting value correction mechanism input degree of superheat setting value and the output of above-mentioned PID controlling organization; Correction is to the degree of superheat setting value of above-mentioned PID controlling organization output, and the correction degree of superheat setting value that will accomplish correction outputs to above-mentioned PID controlling organization.
The electronic Expansion Valve Control device of scheme two is in scheme one described electronic Expansion Valve Control device; It is characterized in that; The valve opening that above-mentioned setting value correction mechanism is kept watch on above-mentioned electric expansion valve according to the value of feedback of aforesaid operations amount signal always changes; In each period 1 (for example 1 minute); Calculate the valve opening variable quantity, the valve opening amplitude of variation that are equivalent to second round (for example 10 minutes) in the past; At the valve opening variable quantity that is equivalent to second round in the past is first predetermined pulse (for example 25 pulses) below and the valve opening amplitude of variation of the second round that is equivalent to pass by is under the situation below the first predetermined pulse amplitude (for example 5 pulses); It is higher and be modified to above-mentioned degree of superheat setting value lower to be judged as present degree of superheat setting value; Valve opening variable quantity being equivalent to second round in the past is under the situation more than second predetermined pulse (for example 87 pulses), and it is lower and be modified to above-mentioned degree of superheat setting value higher to be judged as present degree of superheat setting value.Above-mentioned first predetermined pulse and the above-mentioned first predetermined pulse amplitude are the values that obtains based on experiment respectively; Though according to the length of the structure of electric expansion valve, above-mentioned second round and difference; But can be judged as under the degree of superheat control stable status; The higher limit that obtains when turning round between above-mentioned second round; Above-mentioned second predetermined pulse is the value of calculating according to the life-span of electric expansion valve; If the valve opening variable quantity between above-mentioned second round in above-mentioned second predetermined pulse, then continues the running of refrigerating plant, even hypothesis is through the guideline lives (for example 10 years) of electric expansion valve under this operating condition; To the value calculated with the mode of the durable action frequency that is no more than electric expansion valve and obtain based on experiment, can judge reliably that the value of the degree of superheat low and unstable (approximate liquid returns) compares, and is less value.
The electronic Expansion Valve Control device of scheme three is in scheme two described electronic Expansion Valve Control devices; It is characterized in that; Above-mentioned setting value correction mechanism is each period 3 longer than above-mentioned period 1 (for example be all mutually second round 10 minutes); Valve opening variable quantity between the period 3 in past is stored as " value between each period 3 of the valve opening variable quantity between the period 3 "; And the value that will be equivalent to the last time keeps as " value of the last time between each period 3 of the valve opening variable quantity between the period 3 "; In above-mentioned each period 1; Be more than the 3rd predetermined pulse (for example 21 pulses) and be increased to more than 3 times of " value between each period 3 of the valve opening variable quantity between the period 3 " at the valve opening variable quantity between the current period 3 in past; Valve opening variable quantity between the perhaps current period 3 in past is more than the 3rd predetermined pulse (for example 21 pulses) and is increased under the situation more than 4 times of " the last time value of the value between each period 3 of the valve opening variable quantity between the period 3 "; It is lower and be modified to above-mentioned degree of superheat setting value higher all to be judged as present degree of superheat setting value; The value of above-mentioned the 3rd predetermined pulse is based on the value that experiment obtains; Slowly in the system, is the minimum of a value of judging the degree of superheat low and unstable (approximate liquid returns) in the variation of the degree of superheat, is called the condition more than above-mentioned the 3rd predetermined pulse through setting this; Thereby in for example " value between each period 3 of the valve opening variable quantity between the period 3 " is 1 pulse; Valve opening variable quantity between the period 3 in past of above-mentioned each period 1 is the situation of 3 pulses, and perhaps " the last time value of the value between each period 3 of the valve opening variable quantity between the period 3 " is 1 pulse, and the valve opening variable quantity between the period 3 in past of above-mentioned each period 1 is under the situation of 4 pulses; Under the minimum situation of valve opening variable quantity, can prevent to be judged as the stable situation mistake of control and be judged as the degree of superheat low and unstable (approximate liquid returns).In addition, the above-mentioned multiplying power that is called 3 times, 4 times also is based on the value that obtains of experiment, in the variation of degree of superheat system slowly, is the multiplying power that can judge the degree of superheat low and unstable (approximate liquid returns).
The electronic Expansion Valve Control device of scheme four is in scheme 2 or 3 described electronic Expansion Valve Control devices; It is characterized in that; The moment of setting up from following arbitrary condition begins to carry out the correction of above-mentioned degree of superheat setting value: from the refrigerating plant entry into service; Control device finishes start up process, and the valve opening amplitude of variation of calculating in above-mentioned each period 1 that is equivalent to second round in the past is in the second predetermined pulse amplitude (for example 25 pulses); Perhaps from freezing device entry into service, it is more than 30 minutes that control device finishes the start up process elapsed time.
Effect of the present invention is following.
Electronic Expansion Valve Control device according to scheme one; Electric expansion valve through to refrigerating plant is given the degree of superheat of controlling refrigerating plant with the operational ton signal; It possesses: the PID controlling organization; This PID controlling organization is according to the degree of superheat setting value of input and the mensuration degree of superheat of above-mentioned refrigerating plant, and output is to the operational ton signal of above-mentioned electric expansion valve; And setting value correction mechanism; The value of feedback of the aforesaid operations amount signal of this setting value correction mechanism input degree of superheat setting value and the output of above-mentioned PID controlling organization; Correction is to the degree of superheat setting value of above-mentioned PID controlling organization output; And will accomplish the correction degree of superheat setting value of revising and output to above-mentioned PID controlling organization, thus, can judge that degree of superheat setting value is a height or low through the value of feedback of aforesaid operations amount signal; Can be modified to optimum value, can turn round according to the state of the system of refrigerating plant degree of superheat setting value with the best.
The electronic Expansion Valve Control device of scheme two judges that according to the valve opening variable quantity of electric expansion valve, amplitude of variation present degree of superheat setting value is a height or low and revise; Be set at the mechanical life that is no more than electric expansion valve owing to judge the valve opening variable quantity of the electric expansion valve that this degree of superheat setting value is low; Therefore before electric expansion valve carries out the action more than projected life; Degree of superheat setting value is corrected for higher; Because the degree of superheat changes and the valve opening vary stable of electric expansion valve, therefore except the effect of scheme one, reliability also obviously improves.
Electronic Expansion Valve Control device according to scheme three; Except the effect of scheme two; Larger situation in system is inferior, even above-mentioned degree of superheat setting value is low, the degree of superheat changes instability, also because this degree of superheat changes slow; Therefore the valve opening variable quantity at the electric expansion valve that is equivalent to above-mentioned second round does not reach under the situation of above-mentioned second predetermined pulse (for example 87 pulses); It is unstable to judge that also the degree of superheat changes, and above-mentioned degree of superheat setting value is modified to higher, therefore can turn round with the degree of superheat setting value of the best.
Electronic Expansion Valve Control device according to scheme four; Because state at the unsettled start of run of circulation of cold-producing medium; Can not carry out the correction of degree of superheat setting value; But from the stable circulation of cold-producing medium, the effective state of correction of the degree of superheat setting value that the structure of scheme one to scheme three obtains begins, and therefore can effectively obtain the effect of scheme one to scheme 33.
Description of drawings
Fig. 1 is the major part functional block diagram of first embodiment of electronic Expansion Valve Control device of the present invention.
Fig. 2 is the major part functional block diagram of second embodiment of electronic Expansion Valve Control device of the present invention.
Fig. 3 is the major part functional block diagram of the 3rd embodiment of electronic Expansion Valve Control device of the present invention.
Fig. 4 is first system example and the figure of second system example of the refrigerating plant of the expression control device that used each embodiment of the present invention.
Degree of superheat when Fig. 5 is the starting in the embodiment is set the flow chart of adding processing.
Fig. 6 is the flow chart of the releasing judgment processing of forbidding corrective action in the embodiment.
Fig. 7 is the flow chart of the correcting process of the degree of superheat setting value in the embodiment.
Fig. 8 is the flow chart that subprogram is judged in the correction in the embodiment.
Fig. 9 is the figure that schematically shows the data in the embodiment.
Figure 10 be expression in the embodiment with starting the time the degree of superheat set a routine figure who adds the state of handling corresponding system.
Figure 11 is a routine figure of the state of the corresponding system of the releasing judgment processing with forbid corrective action of expression in the embodiment.
Figure 12 is a routine figure of the state of the corresponding system of the correcting process with degree of superheat setting value of expression in the embodiment.
Among the figure:
1-setting value correction mechanism, 2-PID controlling organization, 3-control object, 4-determination part; 5-corrective action begins decision mechanism, 10-compressor, 20-condenser, 30-electric expansion valve; 40-evaporimeter, 50-valve drive division, the temperature sensor of 60-evaporator outlet side line; 70-pressure sensor, the temperature sensor of 80-evaporator inlet side line, 100-controller.
The specific embodiment
Followingly describe with reference to the embodiment of accompanying drawing to electronic Expansion Valve Control device of the present invention.Fig. 1 is the major part functional block diagram of first embodiment of electronic Expansion Valve Control device of the present invention; Fig. 2 is the major part functional block diagram of second embodiment of electronic Expansion Valve Control device of the present invention; Fig. 3 is the major part functional block diagram of the 3rd embodiment of electronic Expansion Valve Control device of the present invention; In Fig. 1 ~ Fig. 3, the position that with dashed lines surrounds is the peculiar structure of the present invention.Fig. 4 is first system example (Fig. 4 (A)) and the figure of second system example (Fig. 4 (B)) of the refrigerating plant of the expression control device that used each embodiment.
In Fig. 4, the 10th, compressor, the 20th, condenser; The 30th, electric expansion valve; The 40th, evaporimeter, these parts constitute kind of refrigeration cycle through connecting into ring-type by pipe arrangement, form compression, condensation liquefaction, the decompression (expansion) of carrying out cold-producing medium, the known circulation of evaporating gasification.The 50th, according to the valve drive divisions such as impulse motor of the valve opening of input signal adjustment electric expansion valve 30.The 100th, controller, the electronic Expansion Valve Control device actual installation of each embodiment is on controller 100.Controller 100 is obtained the operational ton signal according to the relative PID action of the deviation signal of calculating with the degree of superheat of kind of refrigeration cycle and degree of superheat setting value at inner setting are compared; This operational ton signal is outputed to valve drive division 50, the valve opening of control electric expansion valve 30.Promptly, the operational ton signal is corresponding with the number of drive pulses of the impulse motor that imposes on valve drive division 50.First system example is following with the difference of second system example.
In first system's example of Fig. 4 (A), possess: the temperature sensor 60 of the temperature of the outlet side pipe arrangement of detection evaporimeter 40; And the pressure sensor 70 that detects evaporating pressure at the outlet side of evaporimeter 40; Controller 100 is according to calculating evaporating temperature from the input signal of pressure sensor 70, obtains from the difference of the input signal of the temperature sensor 60 of outlet side pipe arrangement and the evaporating temperature of calculating and calculates the degree of superheat of having utilized the temperature/pressure formula.In second system's example of Fig. 4 (B), possess: the temperature sensor 60 of the temperature of the outlet side pipe arrangement of detection evaporimeter 40; And the temperature sensor 80 of the temperature of the entrance side pipe arrangement of detection evaporimeter 40; Controller 100 is according to the input signal separately from temperature sensor 60,80, obtain evaporimeter 40 the outlet side pipe arrangement temperature and evaporimeter 40 the entrance side pipe arrangement temperature difference and calculate the degree of superheat of having utilized temperature/temp. type.In addition, the above-mentioned degree of superheat of calculating is called " the mensuration degree of superheat ".In addition, the meaning of the difference of illustrated here " X " and " Y " is the meaning of " X "-" Y ".
In first embodiment of Fig. 1, the 1st, setting value correction mechanism, the 2nd, PID controlling organization, the 3rd, control object, the 4th, determination part.Above-mentioned controller 100 has the computer that possesses CPU and memory, carries out the expectant control program through the computer of this controller 100, obtains the function of setting value correction mechanism 1, PID controlling organization 2 and determination part 4.PID controlling organization 2 is made up of the desired value change control part 23 of PID operational part 21, the desired value change portion 22 that possesses required value filter and control desired value change portion 22.In setting value correction mechanism 1, import the for example degree of superheat setting value SV of user's setting, the correction degree of superheat setting value SV ' that setting value correction mechanism 1 will have been revised this degree of superheat setting value SV outputs to desired value change portion 22 and desired value change control part 23.In addition; Control object 3 is to comprise first system example of electric expansion valve 30 or the kind of refrigeration cycle of second system example; Evaporating temperature, the degree of superheat in 4 pairs of these kind of refrigeration cycle of determination part are carried out computing, and the degree of superheat of calculating is outputed to PID operational part 21 as measuring degree of superheat PV.
Desired value change portion 22 makes the correction degree of superheat setting value SV ' variation of input according to the transfer function of required value filter, and the setting value of the degree of superheat after this variation is outputed to PID operational part 21 as desired value.The variation pattern of this desired value carries out with the mode that can control.Revise degree of superheat setting value SV ' and also be imported into desired value change control part 23; Desired value change control part 23 detect the direction of the variation of revising degree of superheat setting value SV ', promptly, detect and revise degree of superheat setting value SV ' and rise or descend, the mode of the variation of the desired value of exporting from desired value change portion 22 according to the direction control of this variation.
PID operational part 21 carries out the PID computing according to the deviation E of degree of superheat setting value of exporting from desired value change portion 22 (desired value) and mensuration degree of superheat PV, and control object 3 is supplied with operational ton signal MV.Like this, in embodiment, possesses required value filter; Carry out the PID control of 2DOF, utilize desired value change control part 23 that desired value is changed portion 22 and be controlled to be, compare the variation of the desired value when revising degree of superheat setting value SV ' rising; The variation of the desired value during decline is slow; Thus, as long as under condition at that time, be suitable value with respect to the control object, though when then revising degree of superheat setting value SV ' and rising or when decline can both make and measure degree of superheat PV and promptly concentrate.
In the general refrigerating plant that has used patent documentation 1,2 and electronic Expansion Valve Control device of the present invention, under the high situation of degree of superheat setting value, the vary stable of the degree of superheat.Otherwise under the low situation of degree of superheat setting value, because following reason, it is unstable that the variation of the degree of superheat becomes.In degree of superheat setting value is under appropriate value or the situation more than it; Cold-producing medium in the pipe arrangement has been evaporated in evaporimeter; Installation site at the temperature sensor that detects outlet pipe arrangement temperature becomes gas fully, and then becomes the state of overheated superheated vapor and pass through.The amount that partially absorbs heat on every side of cold-producing medium evaporation becomes gas and overheated part far away fully more than cold-producing medium evaporates, so the pipe arrangement of the part of cold-producing medium evaporation is in low temperature.Thus, in the front and back of the low-pressure side pipe arrangement of refrigerating plant, the part that exists temperature sharply to change just exists evaporation to change the part that finishes, changes overheated variation into.In degree of superheat setting value is under appropriate value or the situation more than it; Because the part that its evaporation changes end is positioned at than detects the position that the installation site of the temperature sensor of outlet pipe arrangement temperature is leaned on upstream side more; Therefore this part is utilized degree of superheat control; Even move a little forwards, backwards, also stable to the outlet pipe arrangement temperature of controller input, it is also stable to measure the degree of superheat.But; In degree of superheat setting value is to be lower than under the situation of appropriate value, and above-mentioned evaporation changes the approaching installation site of detecting the temperature sensor of outlet pipe arrangement temperature of the part that finishes, if this position utilizes degree of superheat control and mobile a little forwards, backwards; Then rapid variations in temperature also takes place in the outlet pipe arrangement temperature to the controller input; The variation of measuring the degree of superheat becomes big, if as one man control the degree of superheat therewith, the variation of then measuring the degree of superheat becomes vibration.The correcting process of degree of superheat setting value of the present invention is under the situation of degree of superheat vary stable; Degree of superheat setting value is modified to lower, otherwise, change under the unsettled situation in the degree of superheat; Be modified to degree of superheat setting value higher; Therefore, its result, cold-producing medium finishes in the position evaporation of the upstream side a little of the installation site of the temperature sensor that detects outlet pipe arrangement temperature.Because the temperature sensor that detects outlet pipe arrangement temperature is installed in the outlet of evaporimeter, therefore, almost is to accomplish evaporation with whole evaporimeter, can carry out the good heat exchange of efficient.
At this; In the such electronic Expansion Valve Control device of the present invention; If measure the degree of superheat than degree of superheat setting value height then be controlled to be valve opening and become big; Otherwise the mensuration degree of superheat then is controlled to be valve opening when lower than degree of superheat setting value and diminishes, thereby makes the mensuration degree of superheat of kind of refrigeration cycle equate with degree of superheat setting value.Therefore, the variation of the degree of superheat of kind of refrigeration cycle is also embodied in the variation (variation of operational ton signal MV) of the valve opening of electric expansion valve 30.Therefore; To be input to setting value correction mechanism 1 from the output feedback of the operational ton signal MV of PID controlling organization 2 (PID operational part 21) output; This setting value correction mechanism 1 supervisory work amount signal MV revises degree of superheat setting value SV, and degree of superheat setting value SV ' is revised in output.In addition, the situation of above-mentioned patent documentation 2 is to measure degree of superheat PV to setting value correction mechanism feedback.
Promptly, the mensuration degree of superheat in kind of refrigeration cycle does not equate with degree of superheat setting value; When vibrating to repeat the mode more high or low than degree of superheat setting value; The variation of the valve opening vibration that also becomes, under the stable situation of the mensuration degree of superheat of kind of refrigeration cycle, the variation of valve opening is also stable.Therefore, even the not variation of the directly input mensuration degree of superheat as patent documentation 2, its result also imports the output of the operational ton signal MV of the control mensuration degree of superheat through feedback, and can judge that it is stable or instability that the degree of superheat changes.Like this, judge, thereby can consider life-span of machinery of the operating side of electric expansion valve simultaneously through the output that utilizes operational ton signal MV.This is because revise to reduce its action under the situation of too moving in the operating side.
In second embodiment of Fig. 2, the key element that has marked the symbol identical with Fig. 1 is identical with first embodiment, detailed.In this second embodiment, possess feedback and begin decision mechanism 5 from the corrective action of the evaporating temperature of determination part 4." degree of superheat during starting is set and is added processings " that this corrective action begins to state after decision mechanism 5 carries out whether finish and corrective action forbid the judgement that whether is disengaged, and export the indication that the correcting process that makes degree of superheat setting value begins to setting value correction mechanism 1.
In the 3rd embodiment of Fig. 3, the key element that has marked the symbol identical with Fig. 1 is identical with first embodiment, detailed.In the 3rd embodiment, PID operational part 21 itself is " a PID controlling organization ", and setting value correction mechanism 1 constitutes, and the correction degree of superheat setting value SV ' that has revised degree of superheat setting value SV is directly outputed to PID operational part 21.
Secondly, the control more specifically to embodiment describes.At first,, refrigerating plant carries out " degree of superheat during starting is set and added processing " when starting.This is according to following reason.The refrigerating plant entry into service soon during, in cold-producing medium spread all over the refrigerant piping system, evaporimeter 40 inner refrigerants were not enough, the degree of superheat uprises.If detect this higher degree of superheat and under this state, carry out degree of superheat control, then cause the valve opening of electric expansion valve 30 excessively to be opened.And, in cold-producing medium spreads all over the refrigerant piping system or the degree of superheat have little time to control when changing lessly and have and make and become tendency that liquid refluxes etc. stable state of a control and become slow.Therefore, as following, carry out " degree of superheat is set and added processing ".
Begin the finish time from the start up process of refrigerating plant; During any was set up up to the condition of following (1) or (2), the correction degree of superheat SV ' of setting value correction mechanism 1 output set the value of (SH) but the degree of superheat will start the time is set the value of (SHS) and carried out the degree of superheat as desired value and control with the predefined degree of superheat.
(1) " finishes through 10 minutes " from start up process
(2) " amplitude of variation of the evaporating temperature (SL) that the self-starting processing finishes be 3 (K)/5 minute in "
The degree of superheat in when starting is set (SHS) treat as " additional amount " with the difference that the degree of superheat is set (SH), in the moment of any establishment of condition (1) or (2), it is zero making additional amount.Promptly, in appearance, desired value is changed to SH from SHS.
Next, the zero hour of the corrective action that the degree of superheat that control utilizes setting value correction mechanism 1 to carry out is set.Finish from start up process, the corrective action that the degree of superheat is set is forbidden in any establishment up to following condition (3) or (4).And, when any of condition (3) or (4) set up, be judged as the normal condition state of valve power balance (load with), that removes corrective action that the degree of superheat sets forbids the beginning corrective action.
(3) " finish through 30 minutes " from start up process
(4) " the valve opening amplitude of variation during past 10 minutes is in 25 pulses "
Start up process is following processing: through from the refrigerating plant entry into service, (action of this input signal is called " starting input ", is input to controller through changeover contact etc. to the indication of controller input control beginning.) begin the processing carried out before the PID control of the degree of superheat to controller; Make the valve opening of electric expansion valve for example be in the valve opening position (being referred to as the starting aperture) of beginning PID control, perhaps before beginning PID control, will start aperture maintenance certain hour (being referred to as the starting time).
The corrective action that the degree of superheat that setting value correction mechanism 1 carries out is set carries out as follows.If with the low state running of the desired value of the degree of superheat; Then liquid refrigerant is come near the installation site of temperature sensor 60 of outlet pipe arrangement of evaporimeter 40; It is unstable that the input of temperature sensor 60 (detected temperatures) becomes, and the value of measuring the degree of superheat becomes unstable.So, detect having or not of this labile state, the setting of the degree of superheat is modified to optimum value, generate and revise degree of superheat setting value.
The corrective action of degree of superheat setting value is also implemented with the additional amount that " degree of superheat during starting is set and added processing " increase and decrease is likewise set.The valve opening of the detection of labile state through electric expansion valve 30 change, be that the variation of operational ton signal MV is judged.
Fig. 9 is the figure that schematically shows the data that setting value correction mechanism 1 carries out.In order to revise degree of superheat setting value; Setting value correction mechanism 1 begins respectively the data during gathering valve opening variable quantity according to operational ton signal MV, maximum opening position, minimum aperture position 1 minute in per 1 minute from the moment that start up process finishes, and keeps 10 minutes in the past.Then, these data during per 1 minute are calculated following (a) and value (b).
Valve opening variable quantity during past 10 minutes ... (a)
Valve opening amplitude of variation during past 10 minutes ... (b)
In addition, (c) below also upgrading reached value (d) after carrying out above-mentioned per 1 minute processing in per 10 minutes.
Per 10 minutes value of the valve opening variable quantity (a) during past 10 minutes ... (c)
The last time value of per 10 minutes value of the valve opening variable quantity (a) during past 10 minutes ... (d)
If " degree of superheat during starting is set and added processing " finishes, remove forbidding of corrective action, the condition of (5) to (9) below then per 1 minute being judged, the additional amount that increase and decrease is set carries out the correction of degree of superheat setting value.
The correction that (detecting the situation of stable state) reduced degree of superheat setting value is carried out according to the condition of following (5) and (6).
(5) the valve opening variable quantity (a) during past 10 minutes is below 25 pulses
(6) the valve opening amplitude of variation (b) during past 10 minutes is below 5 pulses
If above-mentioned condition (5) and (6) both set up, then make the additional amount of setting reduce by 1 (K), be modified to degree of superheat setting value lower.And, be modified to during 15 minutes after hanging down, even above-mentioned condition (5) and (6) both set up, the correction that degree of superheat setting value is reduced.In addition, reach the situation of the stable state that makes the correction that degree of superheat setting value rises, rise beginning during 30 minutes from degree of superheat setting value, the correction that degree of superheat setting value is reduced from labile state.
The correction that (detecting the situation of labile state) risen degree of superheat setting value is carried out according to the condition of following (7), (8) and (9).
(7) the valve opening variable quantity (a) during past 10 minutes is more than 87 pulses
(8) the valve opening variable quantity (a) during past 10 minutes is more than 21 pulses, and is per 10 minutes more than 3 times of value (c) of the valve opening variable quantity during past 10 minutes
(9) the valve opening variable quantity (a) during past 10 minutes is more than 21 pulses, and is last time more than 4 times of (d) of value of per 10 minutes value of the valve opening variable quantity during 10 minutes in the past
If any of above-mentioned condition (7), (8) and (9) set up, then make the additional amount of setting increase by 1.0 (K), revise degree of superheat setting value.
In addition, when having carried out correction, it is zero that the total data of the valve opening variable quantity during per 10 minutes past of gathering in 1 minute, maximum position, minimum position is removed for the time being.And, (c), (d) though value without 10 minutes, also by the Data Update before revising, restart 10 minutes countings.
Fig. 5～Fig. 8 is the flow chart of control action of the setting value correction mechanism 1 of controller 100, and the microcomputer that this control action utilization is built in controller 100 is carried out, and obtains the function of setting value correction mechanism 1.In addition, the processing of Fig. 5～Fig. 7 is handled to the main of controller 100, carries out through the for example Interrupt Process of the time about 1 second, and the processing of Fig. 5 and Fig. 6 is corresponding to second embodiment.
Degree of superheat when Fig. 5 is starting is set the flow chart of adding processing.At first, in step S1, the running beginning; Judge that the self-starting processing finishes whether elapsed time is more than 10 minutes, if be judged as " being ", then will revise degree of superheat setting value and change to SH from SHS in step S2; Finish adding of degree of superheat setting value, return to original duty.If in step S1, be judged as " not being "; Judge in step S3 then whether the amplitude of variation of the evaporating temperature (SL) during 5 minutes is below 3 (K) in the past; If be judged as " being ", then in step S2, finish adding of degree of superheat setting value, return to original duty; If be judged as " not being ", then directly return to original duty.Through above processing, the degree of superheat when carrying out the starting corresponding with above-mentioned condition (1) and (2) is set and is added processing.The state that the corresponding system of processing is added in degree of superheat setting during with this starting is for example as Figure 10.
Fig. 6 is the flow chart of the corrective action releasing judgment processing of forbidding.At first, in step S4, the running beginning judges that the self-starting processing finishes whether elapsed time is more than 30 minutes, if be judged as " being ", then in step S5, removes forbidding of corrective action, returns to original duty.If in step S4, be judged as " not being "; Judge in step S6 then whether the valve opening amplitude of variation during 10 minutes is below 25 pulses in the past; If be judged as " being ", then in step S5, remove forbidding of corrective action, return to original duty; If be judged as " not being ", then directly return to original duty.Through above processing, carry out the processing of the releasing of the forbidding judgement of the corrective action corresponding with above-mentioned condition (3) and (4).The state of the system that the releasing judgment processing of forbidding with this corrective action is corresponding is for example as Figure 11.
Fig. 7 is the flow chart of the correcting process of degree of superheat setting value.This processing is carried out removing under the situation of forbidding of corrective action, starts 1 fen clock time and 10 fens clock times, the moment that repeats this 1 fen clock time and 10 fens clock times to and restart and handle.At first; In step S11, judge whether to have passed through 1 minute, if be judged as " not being "; Then directly return to original duty; If be judged as " being ", then in step S 12, gather the data of valve opening variable quantity during 1 minute according to operational ton signal MV, the maximum opening position during 1 minute, the minimum aperture position during 1 minute respectively, get into step S13.In step S13, calculate over the valve opening variable quantity (a) during 10 minutes, the valve opening amplitude of variation (b) during past 10 minutes from the above-mentioned data that gather, get into step S14.
In step S14, judge whether to have passed through 10 minutes, if be judged as " not being ", then in step S16, carry out the correction of Fig. 8 and judge the processing of subprogram and return to original duty.If in step S14, be judged as " being ", then the last time of per 10 minutes value of per 10 minutes value (c) of the valve opening variable quantity (a) during the past 10 minutes of renewal and the valve opening variable quantity (a) during past 10 minutes is worth (d) in step S15.And, carry out the correction of Fig. 8 at step S16 and judge the processing of subprogram and return to original duty.
Correction at Fig. 8 is judged in the subprogram, carries out the judgement of above-mentioned condition (5), (6) and (7)～(9).In step S21, condition (7) is judged, in step S22, S23, condition (8) is judged, in step S22, S24, condition (9) is judged.And; In step S21, under the situation that condition (7) is set up, under the situation that condition in step S22, S23 (8) is set up; And under the situation that condition (9) is set up in step S22, S24; Get into step S25 respectively, make rise 1 (K) and export of degree of superheat setting value, in step S26, carry out the mask time and handle and return to original duty as revising degree of superheat setting value.It is to be used for becoming under the situation of stable state in the correction that setting value is risen that the mask time of step S26 handles, and does not make the processing of setting the correction that reduces during 30 minutes from setting value rising beginning, is 30 minutes with the mask time set.
Under all invalid situation in above condition (7)～(9); In step S27, judge whether to have passed through the mask time; If be judged as " not being ", then directly return to original duty, if be judged as " being "; Then in step S28, condition (5) is judged, in step S29, condition (6) is judged.And; In step S28, S29; If condition (5) and (6) both set up, then in step S30, make descend 1 (K) and export of degree of superheat setting value as revising degree of superheat setting value, in step S31, carry out the mask time and handle and return to original duty.It is following processing that the mask time of step S31 handles: during 15 minutes that setting value are modified to after hanging down, even above-mentioned condition (5) and (6) both set up, the correction that desired value is reduced is 15 minutes with the mask time set.The state of the system corresponding with the correcting process of above degree of superheat setting value for example is that Figure 12 is such.
In addition, under the degree of superheat state higher, exist in order to make the control output of electric expansion valve, the situation of not moved by upper limit aperture (OLP) restriction to the valve opening position motion than setting value.If under this state, carry out the correction of the degree of superheat, then valve opening changes in upper limit aperture stablely, therefore continues correction that setting value is descended, under the situation of upper limit aperture (OLP) restriction, makes and revises relevant variable and reset, and does not carry out correcting process.
In addition, has the function that liquid in the time of can preventing compressor start returned, prevented the overladen MOP of being called (Maximum Operating Pressure) of compressor motor.Same with upper limit aperture, under the degree of superheat state higher, exist in order electric expansion valve to be carried out control output to the valve opening position motion than setting value, utilize MOP function limiting valve aperture and the situation of not moving.Also make in this case and revise relevant variable and reset, do not carry out correcting process.
Have again, when the user has changed the degree of superheat and sets SH,, make to reset for the time being with the relevant variable of correction when setting change and begin correcting process once more in order to prevent that the movement of the electric expansion valve behind the change setting is identified as labile state.In addition, when having changed SH, have that to remove under the situation of additional amount of setting be zero.
Though the control device of importing for decision operation amount signal output has much at other field, be to be purpose mostly merely to protect the operating side.Control device of the present invention is different with it, and the operational ton signal output after the feedback input is treated as the control input signal, is used for the correction of degree of superheat setting value energetically.Promptly, owing to the output of the operational ton signal imported is that the input unit that purpose is used moves with the mode of restriction operation amount signal output with the protection operating side only, control that therefore can not export target is exported and is made controlled deterioration.With respect to this; Control device of the present invention uses the operational ton signal output after the feedback input; The judgement and the degree of superheat setting value of carrying out operational ton signal output simultaneously and whether be the action in the scope of the reliability that can guarantee electric expansion valve are height or low judgement, thereby can degree of superheat setting value be modified to optimum value, do not make controlled deterioration; Operational ton output is limited in guaranteeing in the scope of reliability of electric expansion valve; And can effectively utilize evaporimeter, above aspect is different with other electric expansion valves, can obtain very big effect.
Claims (4)
1. an electronic Expansion Valve Control device is given the degree of superheat of controlling refrigerating plant with the operational ton signal through the electric expansion valve to refrigerating plant, it is characterized in that possessing:
PID controlling organization, this PID controlling organization are according to the degree of superheat setting value of input and the mensuration degree of superheat of above-mentioned refrigerating plant, and output is with respect to the operational ton signal of above-mentioned electric expansion valve; And
The setting value correction mechanism; The value of feedback of the aforesaid operations amount signal of this setting value correction mechanism input degree of superheat setting value and the output of above-mentioned PID controlling organization; Correction is to the degree of superheat setting value of above-mentioned PID controlling organization output, and the correction degree of superheat setting value that will accomplish correction outputs to above-mentioned PID controlling organization.
2. electronic Expansion Valve Control device according to claim 1 is characterized in that,
The valve opening that above-mentioned setting value correction mechanism is kept watch on above-mentioned electric expansion valve according to the value of feedback of aforesaid operations amount signal always changes; In each period 1; Calculate the valve opening variable quantity that is equivalent to second round in the past; The valve opening amplitude of variation; Valve opening variable quantity being equivalent to second round in the past is below first predetermined pulse; And the valve opening amplitude of variation that is equivalent to second round in the past is under the situation below the first predetermined pulse amplitude; It is higher and be modified to above-mentioned degree of superheat setting value lower to be judged as present degree of superheat setting value
Valve opening variable quantity being equivalent to second round in the past is under the situation more than second predetermined pulse, and it is lower and be modified to above-mentioned degree of superheat setting value higher to be judged as present degree of superheat setting value.
3. electronic Expansion Valve Control device according to claim 2 is characterized in that,
Above-mentioned setting value correction mechanism is in each period 3 longer than the above-mentioned period 1; Storage is the valve opening variable quantity between the period 3 in the past; And remain to and be equivalent to last value; In above-mentioned each period 1; Be more than the 3rd predetermined pulse and be increased to more than 3 times of " value between each period 3 of the valve opening variable quantity between the period 3 " at the valve opening variable quantity between the current period 3 in past; Valve opening variable quantity between the perhaps current period 3 in past is that the 3rd predetermined pulse (for example 21 pulses) is above and be increased under the situation more than 4 times of " the last time amount of the value between each period 3 of the valve opening variable quantity between the period 3 ", and it is lower and be modified to above-mentioned degree of superheat setting value higher all to be judged as present degree of superheat setting value.
4. according to claim 2 or 3 described electronic Expansion Valve Control devices, it is characterized in that,
The moment of setting up from following arbitrary condition begins to carry out the correction of above-mentioned degree of superheat setting value: from the refrigerating plant entry into service; Control device finishes start up process, and the valve opening amplitude of variation of calculating in above-mentioned each period 1 that is equivalent to second round in the past is in the second predetermined pulse amplitude; Perhaps from freezing device entry into service, it is more than 30 minutes that control device finishes the start up process elapsed time.
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| JP2011134777A JP5411209B2 (en) | 2011-06-17 | 2011-06-17 | Electronic expansion valve controller |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI459172B (en) | 2014-11-01 |
| KR101389672B1 (en) | 2014-04-28 |
| JP2013002740A (en) | 2013-01-07 |
| JP5411209B2 (en) | 2014-02-12 |
| CN102829590B (en) | 2014-10-22 |
| TW201300979A (en) | 2013-01-01 |
| KR20120139539A (en) | 2012-12-27 |
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