CN105299974A - Control method for electronic expansion valve of air conditioner - Google Patents
Control method for electronic expansion valve of air conditioner Download PDFInfo
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- CN105299974A CN105299974A CN201510730616.9A CN201510730616A CN105299974A CN 105299974 A CN105299974 A CN 105299974A CN 201510730616 A CN201510730616 A CN 201510730616A CN 105299974 A CN105299974 A CN 105299974A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a control method for an electronic expansion valve of an air conditioner. The control method comprises the steps that after a compressor starts, the actual operation frequency of the compressor is obtained and compared with the set operation frequency; if the actual operation frequency is smaller than the set operation frequency, the opening degree of the electronic expansion valve is controlled to the initial opening degree; otherwise, the control process of adjusting the valve in the initial operation stage is carried out; after the operation time after the compressor starts reaches the set initial operation time, the control process of proportion integration differentiation (PID) valve adjustment is carried out; the control process of PID valve adjustment is the process of taking the difference of the actual exhaust temperature of the compressor and the target exhaust temperature as the deviation and carrying out PID control over the opening degree of the electronic expansion valve based on the deviation; the target exhaust temperature is determined according to the actual operation frequency. By the adoption of the control method, the opening degree of the electronic expansion valve can be adjusted dynamically, rapidly and accurately, and the energy efficiency ratio of an air conditioner refrigerant cycle system is increased.
Description
Technical field
The invention belongs to air-conditioning technique field, specifically, relate to the control method of air-conditioning, more particularly, relate to a kind of control method of air conditioner electronic expansion valve.
Background technology
Electric expansion valve, as a kind of novel control element, is widely used in the air conditioner coolant circulatory system, and by regulating the aperture of electric expansion valve, the refrigerant circulation in regulating system, meets operation of air conditioner performance requirement.Therefore, how controling effectively to electric expansion valve, is the key weighing air-conditioning system Energy Efficiency Ratio.
In prior art, usually adopt the degree of superheat to table look-up and adjust valve method and delivery temperature to table look-up tune valve method to regulate the aperture of air conditioner electronic expansion valve.Wherein, the degree of superheat is tabled look-up and is adjusted valve to be utilize the variable quantity of the difference of suction temperature and coil temperature and difference to carry out tune valve of tabling look-up.One of its shortcoming is that suction temperature and coil temperature are more or less the same, and difference is less, and degree of superheat precision is inadequate, easily occurs the problem of toning.In addition, due to air-conditioning because it adopts capillary to shunt, shunting way is more, general shunting way is 5-6 road, it is comparatively difficult to ensure at production fit on the shunting uniformity that card is good, therefore its coil temperature operationally is also difficult to ensure good uniformity, coil temperature deviation is comparatively large, causes the degree of superheat to be tabled look-up and adjusts the precision of valve lower.Although delivery temperature table look-up adjust valve comparatively the degree of superheat adjust valve to have more advantage, it adjusts valve precision lower, belongs to coarse adjustment, and the also as easy as rolling off a log problem occurring toning at low frequency.
Summary of the invention
The object of this invention is to provide a kind of control method of air conditioner electronic expansion valve, realize, to the dynamic, quick of electronic expansion valve opening and fine adjustment, improving the Energy Efficiency Ratio of the air conditioner coolant circulatory system.
For achieving the above object, the present invention adopts following technical proposals to be achieved:
A control method for air conditioner electronic expansion valve, comprising:
After compressor start runs, obtain the actual motion frequency of compressor, make comparisons with setting running frequency;
If described actual motion frequency is less than described setting running frequency, the aperture controlling electric expansion valve is initial opening; Otherwise, perform the control procedure that initial operation stage adjusts valve;
After the running time that compressor start runs reaches setting initial operating time, perform the control procedure that PID adjusts valve;
Described PID adjusts the control procedure of valve to be using the difference of the actual exhaust air temperature of compressor and target exhaust temperature as deviation, the process of based on described deviation, the aperture of electric expansion valve being carried out to PID control; Described target exhaust temperature is determined according to described actual motion frequency.
Control method as above, is characterized in that, described target exhaust temperature and described actual motion frequency linear.
Control method as above, described initial operation stage adjusts the control procedure of valve, specifically comprises:
At compressor from the first setting-up time after resting state again startup optimization, obtain the target aperture Y1 of electric expansion valve according to formula Y1=a1*f+b1, the aperture controlling electric expansion valve is described target aperture Y1; Described f is the actual motion frequency of compressor, a1 and b1 is constant;
Described compressor from resting state again startup optimization comprise:
Compressor re-powers rear startup optimization; Or
After air-conditioning work pattern changes, compressor start runs; Or
Air-conditioner defrosting terminates rear compressor start and runs.
Control method as above, described initial operation stage adjusts the control procedure of valve, also comprises:
The state of being shut down close to target set temperature by room temperature at compressor transfers room temperature to and departs from described target set temperature and under the state again started, in the second setting-up time after compressor again startup optimization, obtain the target aperture Y2 of electric expansion valve according to formula Y2=a2*f+b2+c2, the aperture controlling electric expansion valve is described target aperture Y2; Wherein, a2 and b2 is constant, and when c is shut down close to described target set temperature by room temperature according to compressor, the actual aperture of electric expansion valve and the actual motion frequency of compressor are determined.
Preferably, described first setting-up time is greater than described second setting-up time.
Control method as above, adjusts at described initial operation stage in the control procedure of valve, samples to set the actual motion frequency of sampling period to compressor, and calculates the change of the actual motion frequency of the compressor of front and back double sampling; If the change of described actual motion frequency is not more than setpoint frequency changing value, keep the target aperture of electric expansion valve constant; Otherwise, the target aperture of electric expansion valve is obtained according to the actual motion frequency of compressor.
Control method as above, also comprises:
After compressor re-powers, the aperture first controlling electric expansion valve is maximum permission aperture, then the aperture controlling electric expansion valve is described initial opening, then, after meeting compressor start condition, controls compressor start and runs.
Control method as above; in compressor shutdown and non-power down time; keep the current actual aperture of electric expansion valve constant and the lasting setting duration; when the duration reaches the described setting duration; the aperture first controlling electric expansion valve is maximum permission aperture; then, the aperture controlling electric expansion valve is described initial opening, and keeps.
Control method as above, also comprises:
Judge that the aperture of electric expansion valve is whether in the allowed band that maximum permission aperture and minimum permission aperture limit, if not, the aperture controlling electric expansion valve is described maximum permission aperture or described minimum permission aperture.
Compared with prior art, advantage of the present invention and good effect are: control method for electronic expansion valve provided by the invention, after compressor start, first by performing the control initializing operation phase tune valve, the aperture of electric expansion valve is adjusted to certain aperture, then using this aperture as initial aperture, again using the difference of the actual exhaust air temperature of compressor and target exhaust temperature as deviation, carry out PID control based on deviation to the aperture of electric expansion valve, achieve the dynamic, quick of electronic expansion valve opening and fine adjustment, not easily occur the problem of toning; And, in PID controls, determine target exhaust temperature in real time according to compressor actual motion frequency, PID is controlled trickleer, more accurate, and the Energy Efficiency Ratio of the air conditioner coolant circulatory system can be improved as much as possible.
After reading the specific embodiment of the present invention by reference to the accompanying drawings, the other features and advantages of the invention will become clearly.
Accompanying drawing explanation
Fig. 1 is the flow chart of a control method embodiment of air conditioner electronic expansion valve of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in further detail.
Refer to Fig. 1, this figure is depicted as the flow chart of a control method embodiment of air conditioner electronic expansion valve of the present invention, specifically, is the flow chart to the embodiment that the electronic expansion valve opening in the air conditioner coolant circulatory system controls.
As shown in Figure 1, this embodiment realize electronic expansion valve opening control method comprise the steps:
Step 11: after compressor start runs, obtains the actual motion frequency of compressor, makes comparisons with setting running frequency.
The actual motion frequency of the compressor in this step, refers to the real time execution frequency in compressor operating process.Running frequency due to compressor is controlled by the controller on air-conditioning computer plate, and therefore, controller can obtain the actual motion frequency during operation of compressor easily.Then, actual motion frequency and setting running frequency are made comparisons, compares both sizes.Wherein, setting running frequency is the frequency values pre-setting and be stored on air-conditioner computer board.General, refer to minimum running frequency when compressor normally runs.Such as, be 10Hz, or 15Hz.
Step 12: judge whether the actual motion frequency of compressor is less than setting running frequency.If so, step 13 is performed; Otherwise, perform step 14.
Step 13: if step 12 judges that the actual motion frequency of compressor is less than setting running frequency, the aperture controlling electric expansion valve is initial opening.Then, 15 are gone to step.
Initial opening is the opening value pre-setting and be stored in air-conditioner computer board, be air-conditioning research staff by means of knowwhy and a large amount of experimental tests, determine before product export and be written to the value in air-conditioner computer board.General, this initial opening is unsuitable excessive, also unsuitable too small, is carrying out aperture adjustment to facilitate on the basis of initial opening, can ensure that the aperture realizing expansion valve fast regulates, can realize accurate adjustment again.For example, be the electric expansion valve of 540 pulses for a standard-sized sheet or complete shut-down aperture, about initial opening can be set to 300 pulses.
If the actual motion frequency of compressor is less than setting running frequency, show compressor be in just start, frequency rise stage.In this process, greatly, if directly according to the aperture of compressor frequency adjustment electric expansion valve, then aperture fluctuation is also large, wayward in compressor frequency change.Therefore, in the case, forced electronic expansion valve is opened with initial opening.Then, step 15 is performed.
Step 14: if step 12 judges that the actual motion frequency of compressor is not less than setting running frequency, performs the control procedure that initial operation stage adjusts valve.Then, 15 are gone to step.
If the actual motion frequency of compressor is not less than setting running frequency, for improving Energy Efficiency Ratio, perform the control procedure that initial operation stage adjusts valve.Then, step 15 is performed.
Step 15: judge whether the running time that compressor start runs reaches setting initial operating time.If so, step 16 is performed; Otherwise, go to step 12, continue to perform step 12 and processing procedure corresponding to follow-up step.
Namely in this embodiment, timer is set, running time timing is carried out to compressor start, and according to timing time, also whether compressor start reaches setting initial operating time running time as the basis for estimation judging whether to enter PID and control.Wherein, setting initial operating time is also pre-set and the time value stored.And setting initial operating time may be a value, also may be multiple value.For the situation of multiple value, please refer to description below.
Step 16: if the time that compressor start runs reaches setting initial operating time, perform the control procedure that PID adjusts valve.
If the time that compressor start runs reaches setting initial operating time, then enter the control procedure that PID adjusts valve.Specifically, PID adjusts the control procedure of valve to be using the difference of the actual exhaust air temperature of compressor and target exhaust temperature as deviation, the process of based on deviation, the aperture of electric expansion valve being carried out to PID control.Wherein, the actual exhaust air temperature of compressor is the real time exhaust gas temperature in compressor operating process, can by detecting at exhaust outlet of compressor set temperature sensor; Target exhaust temperature refers to the delivery temperature expecting to reach, and is determine in real time according to the actual motion frequency of compressor.For example, pre-set and the corresponding table of store compressed machine running frequency and target exhaust temperature, a frequency band correspondence target exhaust temperature.In PID control procedure, table look-up according to compressor real time execution frequency, find the target exhaust temperature corresponding to current compressor running frequency.As preferred embodiment, target exhaust temperature and compressor real time execution frequency linear, with equation expression be: Td=k*f+n.Wherein, k and n is constant that is known, that prestore, and f is compressor real time execution frequency.Linear relationship according to compressor real time execution frequency determines target exhaust temperature, can obtain maximum air-conditioning Energy Efficiency Ratio.
The target exhaust temperature of compressor is determined by said method, the actual exhaust air temperature of compressor can detect in real time and obtain, and, to reach running time with compressor start and set initial operating time, enter PID and adjust electronic expansion valve opening during valve control procedure as initial opening value, then, can pid control algorithm be adopted, perform using the difference of the actual exhaust air temperature of compressor and target exhaust temperature as deviation, adjust valve to control using target exhaust temperature as the PID of control objectives.The concrete grammar performing PID control based on deviation is prior art, is not described in more detail, can realizes with reference to prior art at this.
By adopting PID to adjust valve to control the aperture of electric expansion valve, control accurately, to avoid occurring overshoot.And, not perform PID immediately at compressor start to control, but after compressor start reaches setting initial operating time running time, perform PID again control, the aperture fast lifting of electric expansion valve can be made, improve operational efficiency, and improve the Energy Efficiency Ratio of the air conditioner coolant circulatory system.
In air-conditioning, the condition of compressor start has multiple, such as compressor re-powers rear startup optimization; Air-conditioning work pattern changes (such as, transferring heating mode to by refrigeration mode) and compressor is first shut down restart operation; Air-conditioner defrosting terminates rear compressor start and runs; Room temperature close to compressor shutdown after target set temperature, after target set temperature is departed from indoor, compressor start runs (namely temperature sensing sensor turns compressor startup optimization in ON situation by OFF), etc.In the process that electric expansion valve is controlled, preferably according to compressor at different conditions startup optimization perform different initial operation stage and adjust valve to control.
Specifically, be divided into two kinds of situations, as follows:
Compressor is re-powered rear startup optimization or air-conditioning work pattern change after compressor start to run or air-conditioner defrosting terminates rear compressor start and runs and be defined as compressor from resting state startup optimization again, if compressor is from resting state startup optimization again, adjust in the control procedure of valve at initial operation stage, in the first setting-up time after compressor start runs, obtain the target aperture Y1 of electric expansion valve according to formula Y1=a1*f+b1, the aperture controlling electric expansion valve is target aperture Y1.Wherein, f is the actual motion frequency of compressor, and be also real time execution frequency, a1 and b1 is constant.Wherein, the first setting-up time, a1 and b1 are and preset and the given value stored, and can determine according to the performance parameter of the air conditioner coolant circulatory system.Preferably, the first setting-up time is about 6min.
And if compressor is the state of being shut down close to target set temperature by room temperature transfers room temperature to and depart from target set temperature and the state again started; adjust in the control procedure of valve at initial operation stage; in the second setting-up time after compressor again startup optimization; obtain the target aperture Y2 of electric expansion valve according to formula Y2=a2*f+b2+c2, the aperture controlling electric expansion valve is target aperture Y2.Wherein, the second setting-up time, a2 and b2 are constant, and when c is shut down close to target set temperature by room temperature according to compressor, the actual aperture of electric expansion valve and the actual motion frequency of compressor are determined.And a2 and b2 can be equal with above-mentioned a1 and b1; Second setting-up time is less than the first setting-up time.Such as, the first setting-up time is 6min, and the second setting-up time is 3min.In this second situation, by increasing an aperture correction value c2, aperture to larger opening of electric expansion valve can be adjusted quickly after compressor start, with fast quick-recovery refrigerant circulation.
Adjust in valve control procedure at the initial operation stage of above-mentioned two situations, the aperture of electric expansion valve becomes linear relationship one to one with compressor actual motion frequency.Have a negative impact for avoiding frequent control expansion valve opening when compressor frequency changes little, as preferred embodiment, adjust in the control procedure of valve at initial operation stage, sample to set the actual motion frequency of sampling period to compressor, and calculate the change of the actual motion frequency of the compressor of front and back double sampling.If the change of actual motion frequency is not more than setpoint frequency changing value, keep the target aperture of electric expansion valve constant; Otherwise, the target aperture of electric expansion valve is obtained according to the actual motion frequency of compressor.Wherein, setpoint frequency changing value is also a known numerical value.For example, setpoint frequency changing value is 2Hz, if the change of compressor actual motion frequency is not more than 2Hz, then keep electric expansion valve be before once according to the aperture that compressor actual motion frequency is determined; If the change of compressor actual motion frequency is greater than 2Hz, then according to above-mentioned formula and current compressor actual motion frequency computation part and the aperture upgrading electric expansion valve.
In addition, if compressor re-powers after being power-off, control for ease of unified, first the aperture of electric expansion valve is resetted, to carry out unified control.Specifically, after compressor re-powers, the aperture first controlling electric expansion valve is maximum permission aperture, the aperture controlling electric expansion valve is again initial opening, then, after meeting compressor start condition (as room temperature departs from setting target temperature), control compressor start and run.After compressor start, then perform above-mentioned control.
If in compressor shutdown and non-power down, keep the current actual aperture of electric expansion valve constant and the lasting setting duration, as lasting 2min.When the duration reaches the setting duration, the aperture first controlling electric expansion valve is maximum permission aperture, and then, then the aperture controlling electric expansion valve is initial opening, and keeps.The object done so is also as much as possible the aperture of electric expansion valve is maintained a reference opening amount, improves rapidity and the accuracy of aperture adjustment.
And for avoiding in particular cases occurring that electronic expansion valve opening is excessive or too small, in the control procedure of whole electric expansion valve, whether the aperture of real-time judge electric expansion valve is in the allowed band that maximum permission aperture and minimum permission aperture limit.If in allowed band, control electric expansion valve according to realistic objective aperture; If not in allowed band, then the aperture controlling electric expansion valve is maximum permission aperture (when realistic objective aperture is greater than maximum permission aperture) or minimum permission aperture (when realistic objective aperture is less than maximum permission aperture).Wherein, maximum permission aperture and minimum permission aperture are values that is known, that determine according to the performance parameter of the air conditioner coolant circulatory system.
Above embodiment only in order to technical scheme of the present invention to be described, but not is limited; Although with reference to previous embodiment to invention has been detailed description, for the person of ordinary skill of the art, still can modify to the technical scheme described in previous embodiment, or equivalent replacement is carried out to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of the present invention's technical scheme required for protection.
Claims (9)
1. a control method for air conditioner electronic expansion valve, is characterized in that, described method comprises:
After compressor start runs, obtain the actual motion frequency of compressor, make comparisons with setting running frequency;
If described actual motion frequency is less than described setting running frequency, the aperture controlling electric expansion valve is initial opening; Otherwise, perform the control procedure that initial operation stage adjusts valve;
After the running time that compressor start runs reaches setting initial operating time, perform the control procedure that PID adjusts valve;
Described PID adjusts the control procedure of valve to be using the difference of the actual exhaust air temperature of compressor and target exhaust temperature as deviation, the process of based on described deviation, the aperture of electric expansion valve being carried out to PID control; Described target exhaust temperature is determined according to described actual motion frequency.
2. control method according to claim 1, is characterized in that, described target exhaust temperature and described actual motion frequency linear.
3. control method according to claim 1, is characterized in that, described initial operation stage adjusts the control procedure of valve, specifically comprises:
At compressor from the first setting-up time after resting state again startup optimization, obtain the target aperture Y1 of electric expansion valve according to formula Y1=a1*f+b1, the aperture controlling electric expansion valve is described target aperture Y1; Described f is the actual motion frequency of compressor, a1 and b1 is constant;
Described compressor from resting state again startup optimization comprise:
Compressor re-powers rear startup optimization; Or
After air-conditioning work pattern changes, compressor start runs; Or
Air-conditioner defrosting terminates rear compressor start and runs.
4. control method according to claim 3, is characterized in that, described initial operation stage adjusts the control procedure of valve, also comprises:
The state of being shut down close to target set temperature by room temperature at compressor transfers room temperature to and departs from described target set temperature and under the state again started, in the second setting-up time after compressor again startup optimization, obtain the target aperture Y2 of electric expansion valve according to formula Y2=a2*f+b2+c2, the aperture controlling electric expansion valve is described target aperture Y2; Wherein, a2 and b2 is constant, and when c is shut down close to described target set temperature by room temperature according to compressor, the actual aperture of electric expansion valve and the actual motion frequency of compressor are determined.
5. control method according to claim 4, is characterized in that, described first setting-up time is greater than described second setting-up time.
6. the control method according to claim 3 or 4, it is characterized in that, adjust at described initial operation stage in the control procedure of valve, sample to set the actual motion frequency of sampling period to compressor, and calculate the change of the actual motion frequency of the compressor of front and back double sampling; If the change of described actual motion frequency is not more than setpoint frequency changing value, keep the target aperture of electric expansion valve constant; Otherwise, the target aperture of electric expansion valve is obtained according to the actual motion frequency of compressor.
7. control method according to claim 1, is characterized in that, described method also comprises:
After compressor re-powers, the aperture first controlling electric expansion valve is maximum permission aperture, then the aperture controlling electric expansion valve is described initial opening, then, after meeting compressor start condition, controls compressor start and runs.
8. control method according to claim 1; it is characterized in that; in compressor shutdown and non-power down time; keep the current actual aperture of electric expansion valve constant and the lasting setting duration; when the duration reaches the described setting duration, the aperture first controlling electric expansion valve is maximum permission aperture, then; the aperture controlling electric expansion valve is described initial opening, and keeps.
9. control method according to claim 1, is characterized in that, described method also comprises:
Judge that the aperture of electric expansion valve is whether in the allowed band that maximum permission aperture and minimum permission aperture limit, if not, the aperture controlling electric expansion valve is described maximum permission aperture or described minimum permission aperture.
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