CN102954555B - Method for controlling opening of expansion valve - Google Patents
Method for controlling opening of expansion valve Download PDFInfo
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- CN102954555B CN102954555B CN201110241726.0A CN201110241726A CN102954555B CN 102954555 B CN102954555 B CN 102954555B CN 201110241726 A CN201110241726 A CN 201110241726A CN 102954555 B CN102954555 B CN 102954555B
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Abstract
The invention discloses a method for controlling opening of an expansion valve. The method includes the steps of firstly, setting targeted superheat degree, superheat degree difference reduced value, quick action quantity, stable action quantity, quick waiting time and stable waiting time, wherein the quick waiting time is less than the stable waiting time; secondly calculating current superheat degree difference; and thirdly, judging whether absolute value of the current superheat degree difference is larger than the superheat degree difference reduced value or not, according to the judged result, controlling the expansion valve to act according to the quick action quantity or stable action quantity, and returning to the step 2 after corresponding quick waiting time or stable waiting time. The method is used for arranging corresponding regulation areas according to the superheat degree difference, and time interval of action of the expansion valve is short when the superheat degree difference is far from the targeted superheat degree, so that the superheat degree difference is conveniently close to the targeted superheat degree quickly; and time interval of action of the expansion valve is long when the superheat degree difference is close to the targeted superheat degree, the interval is regulated when the current superheat degree changes to be adaptable to the current opening, and accordingly lagged influence and vibration of a system are eliminated and opening of the expansion valve is approximately optimal.
Description
Technical field
The present invention relates to control valve technical field, particularly a kind of method of controlling expansion valve opening.
Background technology
In existing constant speed domestic air-conditioning system, generally adopt capillary or heating power expansion valve to carry out throttling.But when capillary-compensated, the flow of refrigerant cannot regulate with the change of operating mode, cause the cooling/heating ability can not optimization, room temperature attainability is poor, and easily causes a series of system problems such as the hypertonia under hot conditions; Heating power expansion valve can be adjusted cold medium flux automatically according to the degree of superheat, but owing to existing temperature to arrive the transmittance process of pressure, there is control lag, the large problem that fluctuates, thereby cause systematic function decline, cannot under optimum state, move.
In order to solve the problem of said structure expansion valve, in prior art, there is the electric expansion valve that regulates aperture according to the degree of superheat, aperture by real-time control electric expansion valve is so that refrigerant keeps optimum flow, thereby makes system in optimization state, improves systematic function.
The regulation of above-mentioned electric expansion valve is mainly realized by following manner: first, the target setting degree of superheat, the target degree of superheat can be determined according to the delivery temperature of exhaust outlet of compressor; Secondly, the current degree of superheat of Real-time Obtaining, the current degree of superheat can calculate according to the temperature difference of evaporator and outlet; Finally, calculate the difference of the target degree of superheat and the current degree of superheat, owing to thering is corresponding relation between the degree of superheat and the aperture of electric expansion valve, regulate the aperture of electric expansion valve can make the current degree of superheat gradually near the target degree of superheat, the main optimum aperture codomain of calculating electric expansion valve by two score value domain search methods, until obtain optimum aperture.
Above-mentioned electric expansion valve can change and regulate in real time aperture according to the degree of superheat, solved to a certain extent the problem of capillary and pressure expansion valve, but it still exists following technical problem in adjustment process:
First, the degree of superheat is temperature the calculated difference of outlet by detecting evaporimeter and entrance or detects compressor suction and the temperature of evaporimeter medium temperature calculated difference obtain, and with the adjusting of expansion valve opening, there is stable process in the adjusting of system temperature, the each temperature value detecting is not often the equilibrium temperature corresponding with the current aperture of expansion valve, the formation of equilibrium temperature lags behind expansion valve opening and regulates, therefore, even if the current aperture of expansion valve has met degree of superheat demand, due to hysteresis quality impact, control system still can continue to regulate aperture according to the temperature detecting, thereby cause expansion valve can have larger vibration in the process regulating, cannot be stabilized in required desired value always.
The second, while calculating the optimum aperture of method control expansion valve of optimum aperture codomain by two score value domain search methods, between the inevitable bound in optimum aperture codomain of optimum aperture that two score value domain search methods are determined, therefore the minimum that expansion valve opening regulates will be subject to the restriction of optimum aperture codomain, cannot accomplish the aperture amount control of minimum precision.In addition continuous positive and negative adjustment when two score value domain search methods may cause expansion valve opening to be adjusted, the vibration that further strengthens system.
Summary of the invention
Core of the present invention is for providing a kind of method of controlling expansion valve opening, the method is according to the big or small setting regions of the degree of superheat and target degree of superheat difference, zones of different arranges the different stand-by period, thereby expansion valve can improved on the basis of regulation and control speed, the hysteresis quality impact of elimination system, improve accuracy, and vibration while reducing system regulation.
To achieve the object of the present invention, the invention provides a kind of method of controlling expansion valve opening, comprise the steps:
1) the target setting degree of superheat, degree of superheat difference reduced value Δ T1, quick acting amount and operating stably amount, fast stand-by period and the stable stand-by period, and the stand-by period is less than and stablizes the stand-by period fast;
2) obtain the current degree of superheat and calculate it and the current degree of superheat difference DELTA Tsh of the described target degree of superheat;
3) whether the absolute value that judges this current degree of superheat difference DELTA Tsh is greater than degree of superheat difference reduced value Δ T1, is to enter step 31); No, enter step 32);
31) control expansion valve and move according to described quick acting amount, and return to step 2 after the described quick stand-by period of correspondence);
32) control expansion valve and move according to described operating stably amount, and return to step 2 after the described stable stand-by period of correspondence).
Preferably,
Step 1) in, set degree of superheat difference reduced value Δ T1, the Δ T2, the Δ T3... Δ Tn that sequentially increase, wherein n >=2, and set respectively with Δ T1～Δ T2 region, Δ T2～Δ T3 region ... quick stand-by period T1 corresponding to Δ Tn～Δ+∞ region, T2, T3 ... Tn, wherein, T1 > T2 > T3... > Tn;
Step 31) in, determine the region corresponding with current degree of superheat difference DELTA Tsh, control expansion valve and move according to described quick acting amount, and return to step 2 after quick stand-by period corresponding to corresponding region).
Preferably,
Step 1) in, set respectively with Δ T1～Δ T2 region, Δ T2～Δ T3 region ... actuating quantity COEFFICIENT K 1 corresponding to Δ Tn～Δ+∞ region, K2, K3 ... Kn, wherein, K1 < K2 < K3... < Kn; And quick acting amount equals the product of the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region;
Step 31) in, the product that calculates the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region obtains corresponding quick acting amount, control expansion valve according to the action of quick acting amount, and return to step 2 after this quick stand-by period corresponding to corresponding region).
Preferably, the operation precision that described operating stably amount is expansion valve.
Preferably,
Step 1) in, also set degree of superheat difference reduced value Δ T0, Δ T0 < Δ T1;
Step 3) in judge current degree of superheat difference DELTA Tsh absolute value while being less than degree of superheat difference reduced value Δ T1, also judge whether the absolute value of current degree of superheat difference DELTA Tsh is less than Δ T0, be to enter step 33); No, enter step 32);
33) record current degree of superheat difference DELTA Tsh and current aperture, and move according to operating stably amount after stablizing the stand-by period, record again current degree of superheat difference DELTA Tsh and current aperture, obtain the corresponding relation between degree of superheat variable quantity and expansion valve opening variable quantity by the aperture contrast of stablizing before and after the stand-by period;
34) calculate the aperture compensating movement amount corresponding with current degree of superheat difference DELTA Tsh according to this corresponding relation;
35) control expansion valve according to this aperture compensating movement amount action;
36) obtain the current degree of superheat of expansion valve and calculate the current degree of superheat difference DELTA Tsh of acquisition, entering step 37);
37) whether the absolute value that judges current degree of superheat difference DELTA Tsh is less than Δ T0, is to return to step 34); No, return to step 3).
Preferably, step 33) specifically comprise the steps:
331) recording current degree of superheat difference DELTA Tsh is that the current aperture of the first degree of superheat difference DELTA Tsh1, expansion valve is the first current aperture P1;
332) control expansion valve according to the action of operating stably amount, and after stablizing the stand-by period, enter step 333);
333) obtain current aperture P and the current degree of superheat of expansion valve, calculate and obtain current degree of superheat difference DELTA Tsh, and calculate | (Δ Tsh-Δ Tsh1) |;
334) calculate the degree of superheat changing value B and the aperture compensating movement amount S that react corresponding relation between degree of superheat variable quantity and expansion valve opening variable quantity:
B＝|(ΔTsh-ΔTsh1)|/(P-P1)；
Step 34) in, aperture compensating movement amount S:S=(Δ Tsh-0)/B calculated.
Preferably, step 1) in go back design temperature and detect minimum of a value; Step 332) in also judgement | (Δ Tsh-Δ Tsh1) | whether be greater than the minimum of a value of temperature detector, be, enter step 334), no, return to step 332).
The method that this invention provides arranges corresponding quick regulation and control region and stable regulation and control region according to the difference size of the current degree of superheat and the target degree of superheat, two regulation and control region divisions corresponding stand-by period and stable stand-by period fast.Be set as regulating and controlling fast region by the region of the wide degree of superheat, expansion valve action is shorter interval time, and aperture changes very fast, so that fast near the target degree of superheat; When the current degree of superheat approaches the target degree of superheat, be set as stable regulation and control region, action is longer interval time, be changed to while adapting with the current aperture of expansion valve until the current degree of superheat, proceed again degree of superheat sampling, calculate current degree of superheat difference and again regulate, thereby can eliminate hysteresis quality and the vibration that quick regulation and control region exists, make the aperture of expansion valve gradually near optimum aperture, to obtain the target degree of superheat.This control method can be on the basis of regulation and control fast, the impact of oscillation-damped and system hysteresis quality.
In further technical scheme, to regulate and control fast region and be divided into more multizone, the quick stand-by period difference that zones of different is corresponding, and due to the setting of actuating quantity coefficient, faster with the regulation and control speed in target degree of superheat region far away, form gradient control, make to regulate and control fast region and both there is higher regulation and control speed, adjustment process is comparatively gentle again, progressively enters stable regulation and control region, further reduces the vibration of system and the impact of hysteresis quality.
In further technical scheme, also do further segmentation for territory, stability control area.Current degree of superheat difference DELTA Tsh is between Δ T0～Δ T1 time, and by stablizing regulation and control model adjustment, system, substantially in stable state, can be used as pre-stable regulation and control field; When the current degree of superheat further approaches the target degree of superheat, when current degree of superheat difference DELTA Tsh is between 0～Δ T0, can carry out high-precision regulation and control, as aperture compensation regulation and control field.Behind pre-stable regulation and control field, while entering aperture compensation regulation and control field, calculate degree of superheat changing value, then calculate for reach target degree of superheat expansion valve still need action aperture compensation rate, after expansion valve action, wait be can stabilize equally, after the overcompensation stand-by period, calculating and the action of next round carried out.Therefore, this step can, on the basis of system stability, be determined and be reached the required aperture actuating quantity of the target degree of superheat, thereby improves the precision that expansion valve opening regulates.
Brief description of the drawings
Fig. 1 is the control flow chart of the first detailed description of the invention of control expansion valve opening method provided by the present invention;
Fig. 2 is the control flow chart of the second detailed description of the invention of the method for control expansion valve opening provided by the present invention;
Fig. 3 is the functional relation schematic diagram that regulates and controls fast actuating quantity coefficient corresponding to Zhong Ge region, region and degree of superheat absolute difference;
Fig. 4 is the functional relation schematic diagram that regulates and controls fast quick stand-by period corresponding to Zhong Ge region, region and degree of superheat absolute difference;
Fig. 5 is the control flow chart of the third detailed description of the invention of control expansion valve opening method provided by the present invention;
Fig. 6 be in Fig. 5 control method each regulation and control region simplified schematic diagram.
Detailed description of the invention
Core of the present invention is for providing a kind of method of controlling expansion valve opening, the method is according to the big or small setting regions of the degree of superheat and target degree of superheat difference, zones of different arranges the different stand-by period, thereby expansion valve can improved on the basis of regulation and control speed, the hysteresis quality impact of elimination system, improve accuracy, and vibration while reducing system regulation.
In order to make those skilled in the art understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, Fig. 1 is the control flow chart of the first detailed description of the invention of control expansion valve opening method provided by the present invention.
The method of the control control expansion valve opening that this detailed description of the invention provides, comprises the steps:
S11) the target setting degree of superheat, degree of superheat difference reduced value Δ T1, quick acting amount and operating stably amount, fast stand-by period and the stable stand-by period, and the stand-by period is less than and stablizes the stand-by period fast;
Expansion valve, in the time starting beginning, can first carry out the reset of expansion valve, and after reset, expansion valve opening will be set to default aperture (can arrange arbitrarily within the scope of the aperture of expansion valve), for making it in stable condition, can keep this aperture certain hour.
The target degree of superheat is refrigeration or the super heat value of heating ability to work while reaching optimization, can determine according to the service behaviour of refrigeration or heating, such as, determine according to the refrigerant temperature of exhaust outlet of compressor.Expansion valve opening corresponding to the target degree of superheat is best aperture, obtains the target degree of superheat by expansion valve opening being adjusted to best aperture place.Degree of superheat difference reduced value is in aftermentioned step, and as the normative reference of current degree of superheat difference DELTA Tsh, current degree of superheat difference DELTA Tsh is the difference of the current degree of superheat and the target degree of superheat.Degree of superheat difference reduced value Δ T1 is greater than zero numerical value, the object of setting degree of superheat difference reduced value Δ T1 is to distinguish the region that is greater than degree of superheat difference reduced value Δ T1 and the region that is less than degree of superheat difference reduced value Δ T1, the former is the region of the wide degree of superheat, the latter is the region that approaches the target degree of superheat, and the concrete numerical value of degree of superheat difference reduced value Δ T1 can determine according to concrete system and actual condition.
S12) obtain the current degree of superheat and calculate it and the current degree of superheat difference DELTA Tsh of the target degree of superheat;
The current degree of superheat (current degree of superheat when original state is corresponding with default aperture) can obtain by the difference of calculating evaporator outlet temperature and evaporator temperature, in evaporator outlet with import department arranges temperature-sensitive bag or temperature sensor can obtain the current degree of superheat.
Whether the absolute value that S13) judges current degree of superheat difference DELTA Tsh is greater than degree of superheat difference reduced value Δ T1, is to enter step S131); No, enter step S132);
In this step by the absolute value of current degree of superheat difference DELTA Tsh and degree of superheat difference reduced value Δ T1 comparison, as previously mentioned, the region and the region that approaches the target degree of superheat that are set as distinguishing the wide degree of superheat of degree of superheat difference reduced value Δ T1, when the current degree of superheat is greater than or less than target degree of superheat certain value, it is consistent needing the aperture size of regulation and control, difference is only the direction of expansion valve action, therefore, herein by the absolute value of current degree of superheat difference DELTA Tsh and degree of superheat difference reduced value Δ T1 comparison.
S131) control expansion valve according to the action of quick acting amount, and return to step S12 after the quick stand-by period of correspondence);
Expansion valve can carry out the adjustment of expansion valve opening according to current degree of superheat difference DELTA Tsh, so that the aperture of expansion valve approaches best aperture., before expansion valve action, also follow the judgement of current degree of superheat difference DELTA Tsh and difference value of zero herein, current degree of superheat difference DELTA Tsh is greater than at 1 o'clock, controls expansion valve positive action, towards the direction action that increases expansion valve opening; Be less than at 1 o'clock, control expansion valve counteragent, towards the direction action that reduces aperture.In following content, relate to the deterministic process that the step of action all exists this place to state, so that expansion valve opening changes towards optimum aperture, followingly relate to the judgement of direction of action in action step with consistent herein, no longer repeat to discuss.
S132) control expansion valve according to the action of operating stably amount, and return to step S12 after the stable stand-by period of correspondence).
From this detailed description of the invention, when current degree of superheat difference DELTA Tsh is greater than degree of superheat difference reduced value Δ T1, the current degree of superheat and target degree of superheat difference are larger, and now, expansion valve is according to quick acting amount and the stand-by period moves fast; When current degree of superheat difference DELTA Tsh is less than degree of superheat difference reduced value Δ T1, the current degree of superheat approaches the target degree of superheat, and expansion valve is according to the action of operating stably amount and stable stand-by period, and the stand-by period is less than and stablizes the stand-by period fast.
While being the wide degree of superheat, be set as regulating and controlling fast region, expansion valve action is shorter interval time, and aperture changes very fast, so that fast near the target degree of superheat; When the current degree of superheat approaches the target degree of superheat, be set as stable regulation and control region, action is longer interval time, be changed to while adapting with the current aperture of expansion valve until the current degree of superheat, proceed again degree of superheat sampling, calculate current degree of superheat difference DELTA Tsh and again regulate, thereby can eliminate hysteresis quality (the regulation and control speed that quick regulation and control region exists, the current degree of superheat not yet reaches the super heat value that current aperture ought to be corresponding) and vibration, make the aperture of expansion valve gradually near optimum aperture, to obtain the target degree of superheat.Hence one can see that, this embodiment is according to the difference size of the current degree of superheat and the target degree of superheat, corresponding quick regulation and control region and stable regulation and control region are set, on the basis of regulation and control fast, the impact of oscillation-damped and system hysteresis quality, certainly for further oscillation-damped impact, quick acting amount is greater than operating stably amount.
Please refer to Fig. 2 to Fig. 4, Fig. 2 is the control flow chart of the second detailed description of the invention of the method for control expansion valve opening provided by the present invention; Fig. 3 is the functional relation schematic diagram that regulates and controls fast actuating quantity coefficient corresponding to Zhong Ge region, region and degree of superheat absolute difference; Fig. 4 is the functional relation schematic diagram that regulates and controls fast quick stand-by period corresponding to Zhong Ge region, region and degree of superheat absolute difference.
The method of this detailed description of the invention control expansion valve opening has following step:
S21) the target setting degree of superheat, sequentially increase degree of superheat difference reduced value Δ T1, Δ T2, Δ T3 ... Δ Tn; Set the actuating quantity coefficient corresponding with degree of superheat difference reduced value zoning, quick acting amount, quick stand-by period; Also set and stablize stand-by period and operating stably amount;
Arrange the degree of superheat difference reduced value Δ T1, Δ T2, Δ T3 that sequentially increase ... Δ Tn, wherein, n >=2, each degree of superheat difference reduced value will regulate and control fast region and be divided into Δ T1～Δ T2, Δ T2～Δ T3, Δ T3～Δ T4... Δ Tn～Δ+∞ n region altogether, the stable stand-by period T setting comprise respectively with each region sequentially corresponding quick stand-by period T1, T2, T3 ... Tn, wherein T1 > T2 > T3 > ... > Tn; Actuating quantity COEFFICIENT K comprise respectively with each region sequentially corresponding actuating quantity COEFFICIENT K 1, K2, K3 ... Kn, wherein, K1 < K2 < K3 < ... < Kn, can understand in conjunction with Fig. 3 and Fig. 4.Wherein quick acting amount corresponding to each region equals the product of the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region.In addition, fast the stand-by period is less than and stablizes the stand-by period.
S22) obtain the current degree of superheat and calculate it and the current degree of superheat difference DELTA Tsh of the target degree of superheat;
Whether the absolute value that S23) judges this current degree of superheat difference DELTA Tsh is greater than Δ T1, is to enter step S231); No, enter step S232);
S231) determine the region corresponding with current degree of superheat difference DELTA Tsh, calculate the actuating quantity coefficient of corresponding region and the product of current degree of superheat difference DELTA Tsh, draw quick acting amount, enter step S233);
S233) control expansion valve according to the action of quick acting amount, and return to step 22 after quick stand-by period corresponding to corresponding region);
Judge that current degree of superheat difference DELTA Tsh is behind quick regulation and control region, still need and further determine the region corresponding with current degree of superheat difference DELTA Tsh in quick regulation and control region, this step comprises deterministic process.Further illustrate, can be with reference to Fig. 6 described later, n=3, between control region, can be divided into (5 DEG C of degree of superheat difference > between high velocity fast, Δ T3=5 DEG C), (3 DEG C of < degree of superheat difference≤5 DEG C, middling speed interval, Δ T2=3 DEG C) and low regime between (1 DEG C of < degree of superheat difference≤3 DEG C, Δ T1=1 DEG C), three interval degrees of superheat and the target degree of superheat are close gradually; Between high velocity, actuating quantity coefficient corresponding between middling speed interval and low regime is respectively K3, K2, K1 (can get K3=3, K2=2, K1=1), the corresponding quick stand-by period is T3, T2, T1 (can get T3=30s, T2=45s, T1=60s)., in the time that current degree of superheat difference DELTA Tsh is between high velocity, suppose Δ Tsh=6, expansion valve moves with quick acting amount=K3 × Δ Tsh=18, and after T3=30s, returns to step S22); In the time that middling speed is interval, suppose Δ Tsh=4, expansion valve moves with quick acting amount=K2 × Δ Tsh=8, and after T2=45s, returns to step S22); In between low regime time, suppose Δ Tsh=2, expansion valve moves with quick acting amount=K1 × Δ Tsh=2, and after T1=60s, returns to step S22).Will regulate and control fast region and be divided into more multizone, the quick stand-by period difference that zones of different is corresponding, and due to the setting of actuating quantity coefficient, faster with the regulation and control speed in target degree of superheat region far away, form gradient control, make to regulate and control fast region and both had higher regulation and control speed, adjustment process is comparatively gentle again, progressively enter step S232) stable regulation and control region, further reduce the vibration of system and the impact of hysteresis quality.
S232) control expansion valve and move according to described operating stably amount, and return to step S22 after the described stable stand-by period of correspondence).
This step and step S12) identical, play the object of stablizing regulation and control.
Step S21) in, preferably operating stably amount is set as to the operation precision of expansion valve.Be that expansion valve opening is in stable regulation and control region, while approaching optimum aperture, reduce the each actuating quantity of expansion valve, actuating quantity is only the operation precision (being generally 1pulse or 2pulse) of expansion valve, and the stable stand-by period arranging long (such as, can be set to 3 minutes, after common 3 minutes, system overheat degree can be changed to the state adapting with expansion valve opening, in order further to improve regulation and control speed, can determine and stablize the stand-by period according to experiment, in determining 1 minute if test, the degree of superheat reaches comparatively stable state, also can be made as 1 minute by stablizing the stand-by period), the time of expansion valve opening action is shorter, after regulation, can enter stable wait state, through stablizing after the stand-by period, the sampling of Fang Jinhang next round and calculating, the regulation and control in stable regulation and control region are more stable.
Please refer to Fig. 5 and Fig. 6, Fig. 5 is the control flow chart of the third detailed description of the invention of control expansion valve opening method provided by the present invention; Fig. 6 is the simplified schematic diagram in each regulation and control region in Fig. 5 control method.
The method of this detailed description of the invention control expansion valve opening has following step:
S31) the target setting degree of superheat, sequentially increase degree of superheat difference reduced value Δ T0, Δ T1, Δ T2, Δ T3 ... Δ Tn; Set the actuating quantity coefficient corresponding with degree of superheat difference reduced value zoning, quick acting amount, quick stand-by period; Also set and stablize stand-by period, operating stably amount;
With step S21) similar, arrange the degree of superheat difference reduced value Δ T0, Δ T1, Δ T2, Δ T3 that sequentially increase ... Δ Tn, wherein, n >=2, and setting T1, the T2 corresponding with zoning, T3 ... Tn and K1, K2, K3 ... Kn.Compared to step S21), this step is also divided into the region of 0～Δ T1 0～Δ T0 and two regions of Δ T0～Δ T1.Quick acting amount equals the product of the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region equally, the operation precision that the operating stably amount herein arranging is expansion valve.
S32) obtain the current degree of superheat and calculate it and the current degree of superheat difference DELTA Tsh of the target degree of superheat;
S33) judging whether this current degree of superheat difference DELTA Tsh is greater than Δ T1, is to enter step S332); No, enter step S331);
S332) determine region corresponding to current degree of superheat difference DELTA Tsh, calculate the actuating quantity coefficient of corresponding region and the product of corresponding degree of superheat difference and draw quick acting amount, enter step S3321);
S3321) control expansion valve according to the action of quick acting amount, and return to step 32 after quick stand-by period corresponding to corresponding region);
S331) judging whether this current degree of superheat difference DELTA Tsh is greater than Δ T0, is to enter step S3312), no, enter step S3311);
S3312) control expansion valve according to the action of operating stably amount, and return to step S32 after the stable stand-by period of correspondence);
S3311) recording current degree of superheat difference DELTA Tsh is that the current aperture P of the first current super heat value Δ Tsh1, expansion valve is the first current aperture P1;
S3312) control expansion valve according to the action of operating stably amount, and after stablizing the stand-by period, enter step S3313);
When operating stably measures the operation precision (being generally 1pulse or 2pulse) for expansion valve, the each action of expansion valve, with operation precision action, can more accurately be reacted the corresponding relation between expansion valve opening variable quantity and degree of superheat variable quantity.Hence one can see that, and this place also can move not according to operation precision, also can realize object of the present invention according to less operating stably amount action.
S3313) obtain current aperture P and the current degree of superheat of expansion valve, calculate and obtain current degree of superheat difference DELTA Tsh, and calculate | (Δ Tsh-Δ Tsh1) |;
S3314) calculate degree of superheat changing value B:B=| (Δ Tsh-Δ Tsh1) |/(P-P1);
S3315) calculate aperture compensating movement amount S:S=(Δ Tsh-0)/B;
S3316) control expansion valve action according to aperture compensating movement amount S, and after stablizing the stand-by period, enter step S3317);
S3317) obtain current aperture P and the current degree of superheat of expansion valve, calculate and obtain current degree of superheat difference DELTA Tsh;
S3318) judging whether this current degree of superheat difference DELTA Tsh is greater than Δ T0, is to return to step S33), no, return to step S3311).
With to stablize the stand-by period in the second detailed description of the invention similar, the stable stand-by period can obtain according to experiment.
In this embodiment, also do further segmentation for territory, stability control area, Δ T0=0.5 DEG C in Fig. 6.Current degree of superheat difference DELTA Tsh is between Δ T0～Δ T1 time, and by stablizing regulation and control model adjustment, system, substantially in stable state, can be used as pre-stable regulation and control field; When the current degree of superheat further approaches the target degree of superheat, when current degree of superheat difference DELTA Tsh is between 0～Δ T0, can carry out high-precision regulation and control, as aperture compensation regulation and control field.When degree of superheat changing value B is the every increase of aperture or minimizing unit act precision, the variable quantity of the degree of superheat, be that degree of superheat changing value B can react the corresponding relation between aperture variable quantity and degree of superheat variable quantity, behind pre-stable regulation and control field, can comparatively accurately measure this value, while entering aperture compensation regulation and control field, calculate degree of superheat changing value B, then calculate for reach target degree of superheat expansion valve still need action aperture compensation rate, after expansion valve action, wait be can stabilize equally, through stablizing after the stand-by period, calculating and the action of next round carried out.Therefore, this step can, on the basis of system stability, be determined and be reached the required aperture actuating quantity of the target degree of superheat, thereby improves the precision that expansion valve opening regulates.This detailed description of the invention is directly reacted the corresponding relation between aperture variable quantity and degree of superheat variable quantity by calculating degree of superheat changing value B, aperture variable quantity is the aperture difference before and after action, in fact, this aperture difference is aperture corresponding to operating stably amount, also can obtain according to the corresponding relation between operation precision and aperture.Certainly,, as long as obtain the corresponding relation between degree of superheat variable quantity and expansion valve opening variable quantity by the aperture contrast before and after action, can realize to obtain aperture compensating movement amount the object that improves control accuracy.
Step S3312) and step S3313) between can also there is a determining step, i.e. judgement | (Δ Tsh-Δ Tsh1) | whether be greater than temperature detector minimum of a value (correspondingly, at step S31) in set this temperature detector minimum of a value), be, return to step S3314), no, return to step S3312).While calculating degree of superheat changing value B, need sample front and back | (Δ Tsh-Δ Tsh1) | value is carried out A/D conversion, conventionally there is specific conversion accuracy, i.e. temperature detector minimum of a value, when | (Δ Tsh-Δ Tsh1) | while being less than this temperature detector minimum of a value, system cannot be obtained this value, cannot carry out the calculating of degree of superheat changing value B, return to step S3312), continue action, increase | (Δ Tsh-Δ Tsh1) | numerical value, be convenient to unfolding calculation.
Above a kind of method of controlling expansion valve opening provided by the present invention is described in detail.Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (6)
1. a method of controlling expansion valve opening, is characterized in that, comprises the steps:
1) the target setting degree of superheat, degree of superheat difference reduced value △ T1, quick acting amount and operating stably amount, fast stand-by period and the stable stand-by period, and the stand-by period is less than and stablizes the stand-by period fast;
2) obtain the current degree of superheat and calculate it and the current degree of superheat difference △ Tsh of the described target degree of superheat;
3) whether the absolute value that judges this current degree of superheat difference △ Tsh is greater than degree of superheat difference reduced value △ T1, is to enter step 31); No, enter step 32);
31) control expansion valve and move according to described quick acting amount, and return to step 2 after the described quick stand-by period of correspondence);
32) control expansion valve and move according to described operating stably amount, and return to step 2 after the described stable stand-by period of correspondence).
2. the method for control expansion valve opening according to claim 1, is characterized in that,
Step 1) in, set the degree of superheat difference reduced value △ T1, △ T2, the △ T3 that sequentially increase ... △ Tn, wherein n >=2, and set respectively with △ T1～△ T2 region, △ T2～△ T3 region ... quick stand-by period T1 corresponding to △ Tn～△+∞ region, T2, T3 ... Tn, wherein, T1 > T2 > T3 ... > Tn;
Step 31) in, determine the region corresponding with current degree of superheat difference △ Tsh, control expansion valve and move according to described quick acting amount, and return to step 2 after quick stand-by period corresponding to corresponding region).
3. the method for control expansion valve opening according to claim 2, is characterized in that,
Step 1) in, set respectively with △ T1～△ T2 region, △ T2～△ T3 region ... actuating quantity COEFFICIENT K 1 corresponding to △ Tn～△+∞ region, K2, K3 ... Kn, wherein, K1 < K2 < K3 ... < Kn; And quick acting amount equals the product of the actuating quantity coefficient of current degree of superheat difference △ Tsh and corresponding region;
Step 31) in, the product that calculates the actuating quantity coefficient of current degree of superheat difference △ Tsh and corresponding region obtains corresponding quick acting amount, control expansion valve according to this quick acting amount action, and return to step 2 after quick stand-by period corresponding to corresponding region).
4. according to the method for the control expansion valve opening described in claims 1 to 3 any one, it is characterized in that the operation precision that described operating stably amount is expansion valve.
5. the method for control expansion valve opening according to claim 4, is characterized in that,
Step 1) in, also set degree of superheat difference reduced value △ T0, △ T0 < △ T1;
Step 3) in judge current degree of superheat difference △ Tsh absolute value while being less than degree of superheat difference reduced value △ T1, also judge whether the absolute value of current degree of superheat difference △ Tsh is less than △ T0, be to enter step 331); No, enter step 32);
331) recording the current aperture that current degree of superheat difference △ Tsh is the first degree of superheat difference DELTA Tsh1, expansion valve is the first current aperture P1;
332) control expansion valve according to the action of operating stably amount, and after stablizing the stand-by period, enter step 333);
333) obtain current aperture P and the current degree of superheat of expansion valve, calculate and obtain current degree of superheat difference DELTA Tsh, and calculate | (Δ Tsh-Δ Tsh1) |;
334) calculate the degree of superheat changing value B:B=| (Δ Tsh-Δ Tsh1) that reacts corresponding relation between degree of superheat variable quantity and expansion valve opening variable quantity |/(P-P1);
34) 1 calculate aperture compensating movement amount S:S=(Δ Tsh-0)/B;
35) control expansion valve according to this aperture compensating movement amount action;
36) obtain the current degree of superheat of expansion valve and calculate the current degree of superheat difference DELTA Tsh of acquisition, entering step 37);
37) whether the absolute value that judges current degree of superheat difference △ Tsh is less than △ T0, is to return to step 34); No, return to step 3).
6. the method for control expansion valve opening according to claim 5, is characterized in that,
Step 1) in go back design temperature and detect minimum of a value;
Step 332) in also judgement | (Δ Tsh-Δ Tsh1) | whether be greater than the minimum of a value of temperature detector, be, enter step 334), no, return to step 332).
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Effective date of registration: 20161206 Address after: Three Hangzhou economic and Technological Development Zone, No. 12, No. 289, No. 310008, Zhejiang Industrial Park Patentee after: Hangzhou Xiantu Electronic Co., Ltd. Address before: 312500 Liquan village of Chengguan Zhejiang city of Shaoxing province Xinchang County town Patentee before: Zhejiang Sanhua Group Co., Ltd. |