CN104930773A - Control method and device of electronic expansion valve and air conditioner - Google Patents
Control method and device of electronic expansion valve and air conditioner Download PDFInfo
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- CN104930773A CN104930773A CN201510395739.1A CN201510395739A CN104930773A CN 104930773 A CN104930773 A CN 104930773A CN 201510395739 A CN201510395739 A CN 201510395739A CN 104930773 A CN104930773 A CN 104930773A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000001052 transient effect Effects 0.000 claims description 19
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 abstract description 23
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 17
- 238000004364 calculation method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- 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
-
- 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)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method and device of an electronic expansion valve and an air conditioner. The method comprises the following steps: starting a compressor of the air conditioner; controlling the opening degree of an electronic expansion valve of the air conditioner to a first opening degree value, and starting timing; detecting a first operation parameter and a first operation condition of the compressor, wherein the first operation parameter is the operation parameter of the compressor when the timing time is between a first preset time and a second preset time, and the first operation condition is the operation condition of the compressor when the timing time is between the first preset time and the second preset time; calculating a second opening value according to the first operating parameter and the first operating condition; and controlling the opening degree of the electronic expansion valve to a second opening degree value. The invention solves the problem that the speed of the compressor in the air conditioning system reaching the stable operation state after starting is slow due to low control accuracy of the electronic expansion valve in the related technology.
Description
Technical field
The present invention relates to air-conditioner field, in particular to a kind of control method of electric expansion valve and device and air-conditioner.
Background technology
At present, along with day by day going deep into of energy-saving and emission-reduction, the examination of the efficiency of small-sized variable-frequency one-to-one air-conditioning system is transitioned into annual efficiency is examined by the fixed point efficiency in past, seasonal energy efficiency, and the capillary section stream unit used in original frequency conversion one-to-one air-conditioning system cannot meet the adjustment requirement of wide condition range and large refrigerant flow excursion, therefore promote the extensive use of electric expansion valve in small-sized variable-frequency one-to-one air-conditioning system.
For the control of electric expansion valve in air-conditioning system, mostly adopting the PID closed-loop feedback control method based on detecting delivery temperature in correlation technique, being controlled by the aperture of multiple preset parameters to electric expansion valve pre-set.But, because the multiple preset parameters pre-set set for compressor arrival steady operational status, therefore after compressor start, steady operational status is arrived during this to compressor, the aperture control accuracy of electric expansion valve is lower, the aperture of electric expansion valve occurs that the aperture control fluctuation of toning or electric expansion valve is larger, thus the time arriving compressor arrival steady operational status after causing compressor start is longer, speed is slower.
For in correlation technique due to lower to the control accuracy of electric expansion valve, cause the slow problem arriving steady operational status in air-conditioning system after compressor start, not yet propose effective solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of control method of electric expansion valve and device and air-conditioner, to solve in correlation technique due to lower to the control accuracy of electric expansion valve, cause the slow problem arriving steady operational status in air-conditioning system after compressor start.
To achieve these goals, according to an aspect of the present invention, a kind of control method of electric expansion valve is provided.The method comprises: the compressor starting air-conditioner; Control aperture to the first opening value of the electric expansion valve of air-conditioner, and start timing; Detect the first operational factor and first service condition of compressor, wherein, first operational factor be timing time between the first Preset Time and the second Preset Time time compressor operational factor, first service condition be timing time between the first Preset Time and the second Preset Time time compressor service condition, the second Preset Time is that preset compressor runs and arrives time of steady operational status; The second opening value is calculated according to the first operational factor and the first service condition; And control aperture to the second opening value of electric expansion valve.
Further, after the compressor starting air-conditioner, before aperture to the first opening value of electric expansion valve controlling air-conditioner, the method also comprises: judge whether compressor is power on for the first time; If compressor powers on for the first time, detect the second operational factor and second service condition of compressor, wherein, second operational factor is after the compressor starting air-conditioner, the operational factor of compressor before aperture to the first opening value of electric expansion valve controlling air-conditioner, second service condition is after the compressor starting air-conditioner, the service condition of compressor before aperture to the first opening value of electric expansion valve controlling air-conditioner; The first opening value is calculated according to the second operational factor and the second service condition; If compressor is not power on for the first time, detect the second operational factor and second service condition of compressor, wherein, second operational factor is after the compressor starting air-conditioner, the operational factor of compressor before aperture to the first opening value of electric expansion valve controlling air-conditioner, second service condition is after the compressor starting air-conditioner, the service condition of compressor before aperture to the first opening value of electric expansion valve controlling air-conditioner; Judge whether to store the opening value corresponding with the second service condition; If stored the opening value corresponding with the second service condition, using opening value corresponding for the second service condition as the first opening value, if do not store the opening value corresponding with the second service condition, calculate the first opening value according to the second operational factor and the second service condition.
Further, calculate the first opening value and comprise: calculate the first opening value by the first preset algorithm according to the second operational factor and the second service condition, wherein, the first preset algorithm is: P=b
1t
out+ b
2t
in+ b
3f+b
4n
out+ b
5n
in, the second service condition comprises association indoor environment temperature T
inwith outdoor environment temperature T
out, the second operational factor comprises compressor operating frequency F, indoor rotation speed of fan N
inwith outside rotation speed of fan N
out, b
1, b
2, b
3, b
4and b
5for constant coefficient, P is the first opening value.
Further, calculate the second opening value according to the first operational factor and the first service condition to comprise: calculate first object delivery temperature according to the first operational factor and the first service condition; Detect the first delivery temperature of compressor, wherein, the first delivery temperature be timing time between the first Preset Time and the second Preset Time time compressor delivery temperature; Judge whether the difference of first object delivery temperature and the first delivery temperature is greater than the first preset difference value; And if the difference of first object delivery temperature and the first delivery temperature is greater than the first preset difference value, according to mathematic interpolation second opening value of first object delivery temperature and the first delivery temperature.
Further, calculate first object delivery temperature according to the first operational factor and the first service condition to comprise: calculate first object delivery temperature by the second preset algorithm, wherein, the second preset algorithm is: T
ds_i=(T
ds_l-i+ T
d_i)/2, T
ds-ithe first object delivery temperature in the i-th moment, T
ds-l-ithe transient target delivery temperature in the i-th moment, T
d-iit is first delivery temperature in the i-th moment.
Further, transient target delivery temperature is calculated by following steps: calculate transient target delivery temperature by the 3rd preset algorithm, wherein, the 3rd preset algorithm is:
T
ds_l=a
1t
e 2+ a
2t
c 2+ a
3t
et
c+ a
4t
e+ a
5t
c+ a
6f
2+ a
7f+a
8, Te is evaporating temperature, and Tc is condensation temperature, and F is compressor operating frequency, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8for constant coefficient, T
ds-lfor transient target delivery temperature.
Further, after aperture to the second opening value controlling electric expansion valve, the method also comprises: the 3rd operational factor and the 3rd service condition that detect compressor, wherein, 3rd operational factor is the operational factor that timing time reaches compressor after the second Preset Time, and the 3rd service condition is the service condition that timing time reaches compressor after the second Preset Time; The second target exhaust temperature is calculated according to the 3rd operational factor and the 3rd service condition; Detect the second delivery temperature of compressor, wherein, the second delivery temperature is the delivery temperature that timing time reaches compressor after the second Preset Time; Judge whether the difference of the second target exhaust temperature and the second delivery temperature is greater than the second preset difference value; If the difference of the second target exhaust temperature and the second delivery temperature is greater than the second preset difference value, according to mathematic interpolation the 3rd opening value of the second target exhaust temperature and the second delivery temperature; And the aperture of control electric expansion valve is to the 3rd opening value.
Further, calculate the second target exhaust temperature and comprise: calculate the second target exhaust temperature by the 4th preset algorithm according to the 3rd operational factor and the 3rd service condition, wherein, the 4th preset algorithm is: T
ds-i=(T
ds_i-1+ T
ds_l-i)/2, T
ds-isecond target exhaust temperature in the i-th moment, T
ds-i-1the first object delivery temperature in the i-th-1 moment, T
ds-l-iit is the transient target delivery temperature in the i-th moment.
To achieve these goals, according to a further aspect in the invention, a kind of control device of electric expansion valve is provided.This device comprises: start unit, for starting the compressor of air-conditioner; First control unit, for controlling aperture to the first opening value of the electric expansion valve of air-conditioner, and starts timing; First detecting unit, for detecting the first operational factor and first service condition of compressor, wherein, first operational factor be timing time between the first Preset Time and the second Preset Time time compressor operational factor, first service condition be timing time between the first Preset Time and the second Preset Time time compressor service condition, the second Preset Time is that preset compressor runs and arrives time of steady operational status; First computing unit, for calculating the second opening value according to the first operational factor and the first service condition; And second control unit, for controlling aperture to the second opening value of electric expansion valve.
Further, the first computing unit comprises: the first computing module, for calculating first object delivery temperature according to the first operational factor and the first service condition; Detection module, for detecting the first delivery temperature of compressor, wherein, the first delivery temperature be timing time between the first Preset Time and the second Preset Time time compressor delivery temperature; Judge module, for judging whether the difference of first object delivery temperature and the first delivery temperature is greater than the first preset difference value; And second computing module, for when the difference of first object delivery temperature and the first delivery temperature is greater than the first preset difference value, according to mathematic interpolation second opening value of first object delivery temperature and the first delivery temperature.
Further, this device also comprises: the second detecting unit, for detecting the 3rd operational factor and the 3rd service condition of compressor, wherein, 3rd operational factor is the operational factor that timing time reaches compressor after the second Preset Time, and the 3rd service condition is the service condition that timing time reaches compressor after the second Preset Time; Second computing unit, for calculating the second target exhaust temperature according to the 3rd operational factor and the 3rd service condition; 3rd detecting unit, for detecting the second delivery temperature of compressor, wherein, the second delivery temperature is the delivery temperature that timing time reaches compressor after the second Preset Time; Judging unit, for judging whether the difference of the second target exhaust temperature and the second delivery temperature is greater than the second preset difference value; 3rd computing unit, for when the difference of the second target exhaust temperature and the second delivery temperature is greater than the second preset difference value, according to mathematic interpolation the 3rd opening value of the second target exhaust temperature and the second delivery temperature; And the 3rd control unit, for controlling the aperture of electric expansion valve to the 3rd opening value.
To achieve these goals, according to a further aspect in the invention, a kind of air-conditioner is provided.This air-conditioner comprises the control device of any one electric expansion valve provided by the invention.
Pass through the present invention, before arriving steady operational status at compressor, operational factor and service condition are detected, the control aperture to electric expansion valve is determined according to the operational factor detected and service condition, the aperture of electric expansion valve and current operating parameter and current operating condition are matched, improve the control accuracy to electric expansion valve, thus improve the speed arriving steady operational status in air-conditioning system after compressor start.Therefore to solve in correlation technique due to lower to the control accuracy of electric expansion valve, cause the slow problem arriving steady operational status in air-conditioning system after compressor start.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the control method of electric expansion valve according to a first embodiment of the present invention;
Fig. 2 is the schematic diagram of air-conditioning system in the control method of electric expansion valve according to a first embodiment of the present invention;
Fig. 3 is the flow chart of the control method of electric expansion valve according to a second embodiment of the present invention; And
Fig. 4 is the schematic diagram of the control device of electric expansion valve according to the embodiment of the present invention.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The application's scheme is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the embodiment of the application's part, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
It should be noted that, term " first ", " second " etc. in the description of the application and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that the embodiment of the application described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
According to embodiments of the invention, provide a kind of control method of electric expansion valve.
Fig. 1 is the flow chart of the control method of electric expansion valve according to a first embodiment of the present invention.As shown in Figure 1, the method comprises the following steps:
Step S101, starts the compressor of air-conditioner.
Step S102, controls aperture to the first opening value of the electric expansion valve of air-conditioner, and starts timing.
The first above-mentioned opening value is after the compressor starting air-conditioner, controls the numerical value of the aperture of the electric expansion valve of air-conditioner.First opening value for being stored in advance in the numerical value in system, also can calculate in several ways.After aperture to the first opening value of electric expansion valve controlling air-conditioner, start timing, the aperture of recorded electronic expansion valve is the time of the first opening value.
Step S103, detects the first operational factor and first service condition of compressor.
Particularly, first operational factor be timing time between the first Preset Time and the second Preset Time time compressor operational factor, first service condition be timing time between the first Preset Time and the second Preset Time time compressor service condition, the second Preset Time is that preset compressor runs and arrives time of steady operational status.
When timing time is between the first Preset Time and the second Preset Time, detect the first operational factor and first service condition of compressor according to predetermined period.
Such as, the first Preset Time is after the compressor start of air-conditioner the 8th minute, and the second Preset Time is after the compressor start of air-conditioner the 15th minute.After the compressor start of air-conditioner between the 8th minute to the 15th minute, periodically detect operational factor and the service condition of compressor.
Step S104, calculates the second opening value according to the first operational factor and the first service condition.
First operational factor and first service condition of the compressor detected according to predetermined period during according to timing time between the first Preset Time and the second Preset Time calculate the second opening value.Namely the second opening value may change according to predetermined period, calculates the first different opening values according to the first different operational factors and the first service condition.
Step S105, controls aperture to the second opening value of electric expansion valve.
Control aperture to the second opening value of the electric expansion valve of air-conditioner.Namely the aperture of electric expansion valve is regulated according to the first different operational factors and the first service condition.
The control method of the electric expansion valve that the embodiment of the present invention provides, before arriving steady operational status at compressor, operational factor and service condition are detected, the control aperture to electric expansion valve is determined according to the operational factor detected and service condition, the aperture of electric expansion valve and current operating parameter and current operating condition are matched, improve the control accuracy to electric expansion valve, thus improve the speed arriving steady operational status in air-conditioning system after compressor start.Therefore to solve in correlation technique due to lower to the control accuracy of electric expansion valve, cause the slow problem arriving steady operational status in air-conditioning system after compressor start.
Preferably, in order to promote the accuracy of calculating second opening value, calculating the second opening value according to the first operational factor and the first service condition and comprising: calculate first object delivery temperature according to the first operational factor and the first service condition; Detect the first delivery temperature of compressor, wherein, the first delivery temperature be timing time between the first Preset Time and the second Preset Time time compressor delivery temperature; Judge whether the difference of first object delivery temperature and the first delivery temperature is greater than the first preset difference value; And if the difference of first object delivery temperature and the first delivery temperature is greater than the first preset difference value, according to mathematic interpolation second opening value of first object delivery temperature and the first delivery temperature.
Calculate the opening value of magnetic valve by exhaust gas temperature change amount and with parameters such as the departures of preset difference value, improve the accuracy of calculating second opening value.
Alternatively, calculate first object delivery temperature according to the first operational factor and the first service condition to comprise: calculate first object delivery temperature by the second preset algorithm, wherein, the second preset algorithm is: T
ds_i=(T
ds_l-i+ T
d_i)/2, Td
s-ithe first object delivery temperature in the i-th moment, T
ds-l-ithe transient target delivery temperature in the i-th moment, T
d-iit is first delivery temperature in the i-th moment.Transient target delivery temperature is calculated by following steps: calculate transient target delivery temperature by the 3rd preset algorithm, wherein, the 3rd preset algorithm is:
T
ds_l=a
1t
e 2+ a
2t
c 2+ a
3t
et
c+ a
4t
e+ a
5t
c+ a
6f
2+ a
7f+a
8, T
efor evaporating temperature, T
cfor condensation temperature, F is compressor operating frequency, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8for constant coefficient, T
ds-lfor transient target delivery temperature.
By association evaporating temperature, condensation temperature, compressor operating frequency and transient target delivery temperature etc., by calculating the first opening value, improve the accuracy obtaining first object delivery temperature, thus reach the effect of the accuracy promoting calculating second opening value.
Alternatively, after aperture to the second opening value controlling electric expansion valve, the method also comprises: the 3rd operational factor and the 3rd service condition that detect compressor, wherein, 3rd operational factor is the operational factor that timing time reaches compressor after the second Preset Time, and the 3rd service condition is the service condition that timing time reaches compressor after the second Preset Time; The second target exhaust temperature is calculated according to the 3rd operational factor and the 3rd service condition; Detect the second delivery temperature of compressor, wherein, the second delivery temperature is the delivery temperature that timing time reaches compressor after the second Preset Time; Judge whether the difference of the second target exhaust temperature and the second delivery temperature is greater than the second preset difference value; If the difference of the second target exhaust temperature and the second delivery temperature is greater than the second preset difference value, according to mathematic interpolation the 3rd opening value of the second target exhaust temperature and the second delivery temperature; And the aperture of control electric expansion valve is to the 3rd opening value.Calculate the second target exhaust temperature according to the 3rd operational factor and the 3rd service condition to comprise: calculate the second target exhaust temperature by the 4th preset algorithm, wherein, the 4th preset algorithm is: T
ds-i=(T
ds_i-1+ T
ds_l-i)/2, T
ds-isecond target exhaust temperature in the i-th moment, T
ds-i-1the first object delivery temperature in the i-th-1 moment, T
ds-l-iit is the transient target delivery temperature in the i-th moment.
Such as, current exhaust gas temperature 72 DEG C, previous moment delivery temperature 74 DEG C, evaporating temperature Te=7 DEG C, condensation temperature Tc=42 DEG C, compressor operating frequency F=65Hz transient target delivery temperature presses formulae discovery:
T
ds_l＝a
1T
e 2+a
2T
c 2+a
3T
eT
c+a
4T
e+a
5T
c+a
6F
2+a
7F+a
8
Wherein, a
1=0.0002, a
2=0.003881, a
3=0.00495, a
4=-0.77775, a
5=0.906131, a
6=0.002237, a
7=-0.16945, a
8=30.27805, then transient target delivery temperature T
ds-l=69.6 DEG C, previous moment transient target delivery temperature 70.5 DEG C, the second target exhaust temperature T
ds-i=70 DEG C, calculating delivery temperature departure is 2 DEG C, and exhaust gas temperature change amount is-2 DEG C.Then the aperture regulated quantity of electric expansion valve is+2 steps.
After compressor operating reaches steady-state operation, by above step, regulate the aperture of electric expansion valve, promote the accuracy to electronic expansion valve controls.
Fig. 2 is the schematic diagram of air-conditioning system in the control method of electric expansion valve according to a first embodiment of the present invention.As shown in Figure 2, this air-conditioning system comprises: compressor 101, cross valve 102, indoor heat exchanger 103, electric expansion valve 104, outdoor heat exchanger 105, indoor blower fan 106 and outside blower fan 107.The outdoor environment temperature-sensitive bag (not indicating in the drawings) in air-conditioning system, outdoor heat exchanger 105 is provided with and outdoor heat exchanger 105 pipe warming thermometer bulb (not indicating in the drawings), in order to detect the temperature of outdoor environment temperature and outdoor heat exchanger 105; The indoor environment temperature-sensitive bag (not indicating in the drawings) in air-conditioning system, indoor heat exchanger 103 is provided with and indoor heat exchanger 103 temperature-sensitive bag (not indicating in the drawings), in order to detect the temperature of indoor environment temperature and indoor heat exchanger 103; In air-conditioning system, compressor air-discharging side is provided with compressor exhaust temperature temperature-sensitive bag (not indicating in the drawings), in order to detect compressor exhaust temperature.
For air-conditioning system refrigerating operaton, Air Conditioning Cycle is described, the refrigerant superheat gas of the HTHP of being discharged by compressor 101 through cross valve 102 laggard enter outdoor heat exchanger 105, heat release in outdoor heat exchanger 105, the cold-producing medium subcooled liquid of HTHP, then through electric expansion valve 104 reducing pressure by regulating flow, the cold-producing medium two-phase mixture becoming low-temp low-pressure enters indoor heat exchanger 103, heat absorption evaporation in indoor heat exchanger 103, become the refrigerant superheat gas of low-temp low-pressure, enter in compressor 101 through cross valve 102 and compress, become the refrigerant superheat gas of HTHP, complete a circulation.
Fig. 3 is the flow chart of the control method of electric expansion valve according to a second embodiment of the present invention.Fig. 3 can as a kind of preferred embodiment embodiment illustrated in fig. 1.As shown in Figure 3, the method comprises the following steps:
Step S301, starts the compressor of air-conditioner.
Step S301, with above-mentioned steps S101, does not repeat them here.
Step S302, judges whether compressor is power on for the first time.
Step S303, if compressor powers on for the first time, detects the second operational factor and second service condition of compressor.
Wherein, second operational factor is after the compressor starting air-conditioner, the operational factor of compressor before aperture to the first opening value of electric expansion valve controlling air-conditioner, second service condition is after the compressor starting air-conditioner, the service condition of compressor before aperture to the first opening value of electric expansion valve controlling air-conditioner.
Step S304, calculates the first opening value according to the second operational factor and the second service condition.
Step S305, if compressor is not power on for the first time, detects the second operational factor and second service condition of compressor.
Step S306, judges whether to store the opening value corresponding with the second service condition.
Step S307, if stored the opening value corresponding with the second service condition, using opening value corresponding for the second service condition as the first opening value.
After compressor start, if stored the best opening value of the electric expansion valve corresponding with the second service condition, then direct using this best opening value as the first opening value.
If do not store the opening value corresponding with the second service condition, jump to step S304, calculate the first opening value according to the second operational factor and the second service condition.
Step S308, controls aperture to the first opening value of the electric expansion valve of air-conditioner, and starts timing.
Step S308, with above-mentioned steps S102, does not repeat them here.
Step S309, detect the first operational factor and first service condition of compressor, wherein, first operational factor be timing time between the first Preset Time and the second Preset Time time compressor operational factor, the first service condition be timing time between the first Preset Time and the second Preset Time time compressor service condition.
Step S309, with above-mentioned steps S103, does not repeat them here.
Step S310, calculates the second opening value according to the first operational factor and the first service condition.
Step S310, with above-mentioned steps S104, does not repeat them here.
Step S311, controls aperture to the second opening value of electric expansion valve.
Step S311, with above-mentioned steps S105, does not repeat them here.
The control method of the electric expansion valve that the embodiment of the present invention provides, due to after the compressor starting air-conditioner, before aperture to the first opening value of electric expansion valve controlling air-conditioner, according to judging whether compressor is power on for the first time, the first opening value is obtained by different modes, improve accuracy and the speed of acquisition first opening value, again before compressor arrives steady operational status, operational factor and service condition are detected, the control aperture to electric expansion valve is determined according to the operational factor detected and service condition, the aperture of electric expansion valve and current operating parameter and current operating condition are matched, improve the control accuracy to electric expansion valve, thus improve the speed arriving steady operational status in air-conditioning system after compressor start.Therefore to solve in correlation technique due to lower to the control accuracy of electric expansion valve, cause the slow problem arriving steady operational status in air-conditioning system after compressor start.
Preferably, calculate the first opening value and comprise: calculate the first opening value by the first preset algorithm according to the second operational factor and the second service condition, wherein, the first preset algorithm is: P=b
1t
out+ b
2t
in+ b
3f+b
4n
out+ b
5n
in, the second service condition comprises association indoor environment temperature T
inwith outdoor environment temperature T
out, the second operational factor comprises compressor operating frequency F, indoor rotation speed of fan N
inwith outside rotation speed of fan N
out, b
1, b
2, b
3, b
4and b
5for constant coefficient, P is the first opening value.
By association indoor environment temperature, outside environment temperature, compressor operating frequency, indoor rotation speed of fan, outside rotation speed of fan etc., by calculating the first opening value, improve the accuracy of acquisition first opening value.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
The embodiment of the present invention additionally provides a kind of control device of electric expansion valve, it should be noted that, the control device of the electric expansion valve of the embodiment of the present invention may be used for performing the control method for electric expansion valve that the embodiment of the present invention provides.Below the control device of the electric expansion valve that the embodiment of the present invention provides is introduced.
Fig. 4 is the schematic diagram of the control device of electric expansion valve according to the embodiment of the present invention.As shown in Figure 4, this device comprises: start unit 10, first control unit 20, first detecting unit 30, first computing unit 40 and the second control unit 50.
Start unit 10, for starting the compressor of air-conditioner.
First control unit 20, for controlling aperture to the first opening value of the electric expansion valve of air-conditioner, and starts timing.
First detecting unit 30, for detecting the first operational factor and first service condition of compressor, wherein, first operational factor be timing time between the first Preset Time and the second Preset Time time compressor operational factor, the first service condition be timing time between the first Preset Time and the second Preset Time time compressor service condition.
First computing unit 40, for calculating the second opening value according to the first operational factor and the first service condition.
Second control unit 50, for controlling aperture to the second opening value of electric expansion valve.
The control device of the electric expansion valve that the embodiment of the present invention provides, owing to passing through the first detecting unit 30 before compressor arrives steady operational status, operational factor and service condition are detected, first computing unit 40 calculates the control aperture to electric expansion valve according to the operational factor detected and service condition, the aperture of electric expansion valve and current operating parameter and current operating condition are matched, improve the control accuracy to electric expansion valve, thus improve the speed arriving steady operational status in air-conditioning system after compressor start.Therefore to solve in correlation technique due to lower to the control accuracy of electric expansion valve, cause the slow problem arriving steady operational status in air-conditioning system after compressor start.
Preferably, in the control device of the electric expansion valve provided in the embodiment of the present invention, the first computing unit 40 also comprises: the first computing module, for calculating first object delivery temperature according to the first operational factor and the first service condition; Detection module, for detecting the first delivery temperature of compressor, wherein, the first delivery temperature be timing time between the first Preset Time and the second Preset Time time compressor delivery temperature; Judge module, for judging whether the difference of first object delivery temperature and the first delivery temperature is greater than the first preset difference value; And second computing module, for when the difference of first object delivery temperature and the first delivery temperature is greater than the first preset difference value, according to mathematic interpolation second opening value of first object delivery temperature and the first delivery temperature.
Preferably, in the control device of the electric expansion valve provided in the embodiment of the present invention, this device also comprises: the second detecting unit, for detecting the 3rd operational factor and the 3rd service condition of compressor, wherein, 3rd operational factor is the operational factor that timing time reaches compressor after the second Preset Time, and the 3rd service condition is the service condition that timing time reaches compressor after the second Preset Time; Second computing unit, for calculating the second target exhaust temperature according to the 3rd operational factor and the 3rd service condition; 3rd detecting unit, for detecting the second delivery temperature of compressor, wherein, the second delivery temperature is the delivery temperature that timing time reaches compressor after the second Preset Time; Judging unit, for judging whether the difference of the second target exhaust temperature and the second delivery temperature is greater than the second preset difference value; 3rd computing unit, for when the difference of the second target exhaust temperature and the second delivery temperature is greater than the second preset difference value, according to mathematic interpolation the 3rd opening value of the second target exhaust temperature and the second delivery temperature; And the 3rd control unit, for controlling the aperture of electric expansion valve to the 3rd opening value.
According to the embodiment of the present invention, additionally provide a kind of air-conditioner.This air-conditioner comprises the control device of any one electric expansion valve provided by the invention.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a control method for electric expansion valve, is characterized in that, comprising:
Start the compressor of air-conditioner;
Control aperture to the first opening value of the electric expansion valve of described air-conditioner, and start timing;
Detect the first operational factor and first service condition of described compressor, wherein, described first operational factor be timing time between the first Preset Time and the second Preset Time time described compressor operational factor, described first service condition be described timing time between described first Preset Time and described second Preset Time time described compressor service condition, described second Preset Time is the time that default described compressor operating arrives steady operational status;
The second opening value is calculated according to described first operational factor and described first service condition; And
Control the aperture of described electric expansion valve to described second opening value.
2. method according to claim 1, is characterized in that, after the compressor starting air-conditioner, before aperture to the first opening value of electric expansion valve controlling described air-conditioner, described method also comprises:
Judge whether described compressor is power on for the first time;
If described compressor powers on for the first time, detect the second operational factor and second service condition of described compressor, wherein, described second operational factor is after the compressor starting described air-conditioner, controlling the aperture of electric expansion valve of described air-conditioner to the operational factor of described compressor before described first opening value, described second service condition is after the compressor starting described air-conditioner, is controlling the aperture of electric expansion valve of described air-conditioner to the service condition of described compressor before described first opening value; Described first opening value is calculated according to described second operational factor and described second service condition;
If described compressor is not power on for the first time, detect the second operational factor and second service condition of described compressor, wherein, described second operational factor is after the compressor starting described air-conditioner, controlling the aperture of electric expansion valve of described air-conditioner to the operational factor of described compressor before described first opening value, described second service condition is after the compressor starting described air-conditioner, is controlling the aperture of electric expansion valve of described air-conditioner to the service condition of described compressor before described first opening value; Judge whether to store the opening value corresponding with described second service condition; If stored the opening value corresponding with described second service condition, using opening value corresponding for described second service condition as described first opening value, if do not store the opening value corresponding with described second service condition, calculate described first opening value according to described second operational factor and described second service condition.
3. method according to claim 2, is characterized in that, calculates described first opening value comprise according to described second operational factor and described second service condition:
Calculate described first opening value by the first preset algorithm, wherein, described first preset algorithm is:
P＝b
1T
out+b
2T
in+b
3F+b
4N
out+b
5N
in
Described second service condition comprises association indoor environment temperature T
inwith outdoor environment temperature T
out, described second operational factor comprises described compressor operating frequency F, indoor rotation speed of fan N
inwith outside rotation speed of fan N
out, b
1, b
2, b
3, b
4and b
5for constant coefficient, P is described first opening value.
4. method according to claim 1, is characterized in that, calculates the second opening value comprise according to described first operational factor and described first service condition:
First object delivery temperature is calculated according to described first operational factor and described first service condition;
Detect the first delivery temperature of described compressor, wherein, described first delivery temperature be described timing time between described first Preset Time and described second Preset Time time described compressor delivery temperature;
Judge whether the difference of described first object delivery temperature and described first delivery temperature is greater than the first preset difference value; And
If the difference of described first object delivery temperature and described first delivery temperature is greater than described first preset difference value, the second opening value according to the mathematic interpolation of described first object delivery temperature and described first delivery temperature.
5. method according to claim 4, is characterized in that, calculates first object delivery temperature comprise according to described first operational factor and described first service condition:
Calculate described first object delivery temperature by the second preset algorithm, wherein, described second preset algorithm is:
T
ds_i＝(T
ds_l-i+T
d_i)/2
T
ds-ithe first object delivery temperature in the i-th moment, T
ds-l-ithe transient target delivery temperature in the i-th moment, T
d-iit is first delivery temperature in the i-th moment.
6. method according to claim 5, is characterized in that, described transient target delivery temperature is calculated by following steps:
Calculate described transient target delivery temperature by the 3rd preset algorithm, wherein, described 3rd preset algorithm is:
T
ds_l＝a
1T
e 2+a
2T
c 2+a
3T
eT
c+a
4T
e+a
5T
c+a
6F
2+a
7F+a
8
T
efor evaporating temperature, T
cfor condensation temperature, F is described compressor operating frequency, a
1, a
2, a
3, a
4, a
5, a
6, a
7and a
8for constant coefficient, T
ds-lfor transient target delivery temperature.
7. method according to claim 1, is characterized in that, controlling the aperture of described electric expansion valve to after described second opening value, described method also comprises:
Detect the 3rd operational factor and the 3rd service condition of described compressor, wherein, described 3rd operational factor is the operational factor that described timing time reaches described compressor after described second Preset Time, and described 3rd service condition is the service condition that described timing time reaches described compressor after described second Preset Time;
The second target exhaust temperature is calculated according to described 3rd operational factor and described 3rd service condition;
Detect the second delivery temperature of described compressor, wherein, described second delivery temperature is the delivery temperature that described timing time reaches described compressor after described second Preset Time;
Judge whether the difference of described second target exhaust temperature and described second delivery temperature is greater than the second preset difference value;
If the difference of described second target exhaust temperature and described second delivery temperature is greater than described second preset difference value, according to mathematic interpolation the 3rd opening value of described second target exhaust temperature and described second delivery temperature; And
Control the aperture of described electric expansion valve to described 3rd opening value.
8. method according to claim 7, is characterized in that, calculates the second target exhaust temperature comprise according to described 3rd operational factor and described 3rd service condition:
Calculate described second target exhaust temperature by the 4th preset algorithm, wherein, described 4th preset algorithm is:
T
ds-i＝(T
ds_i-1+T
ds_l-i)/2
T
ds-isecond target exhaust temperature in the i-th moment, T
ds-i-1the first object delivery temperature in the i-th-1 moment, T
ds-l-iit is the transient target delivery temperature in the i-th moment.
9. a control device for electric expansion valve, is characterized in that, comprising:
Start unit, for starting the compressor of air-conditioner;
First control unit, for controlling aperture to the first opening value of the electric expansion valve of described air-conditioner, and starts timing;
First detecting unit, for detecting the first operational factor and first service condition of described compressor, wherein, described first operational factor be timing time between the first Preset Time and the second Preset Time time described compressor operational factor, described first service condition be described timing time between described first Preset Time and described second Preset Time time described compressor service condition, described second Preset Time is the time that default described compressor operating arrives steady operational status;
First computing unit, for calculating the second opening value according to described first operational factor and described first service condition; And
Second control unit, for controlling the aperture of described electric expansion valve to described second opening value.
10. device according to claim 9, is characterized in that, described first computing unit comprises:
First computing module, for calculating first object delivery temperature according to described first operational factor and described first service condition;
Detection module, for detecting the first delivery temperature of described compressor, wherein, described first delivery temperature be described timing time between described first Preset Time and described second Preset Time time described compressor delivery temperature;
Judge module, for judging whether the difference of described first object delivery temperature and described first delivery temperature is greater than the first preset difference value; And
Second computing module, for when the difference of described first object delivery temperature and described first delivery temperature is greater than described first preset difference value, the second opening value according to the mathematic interpolation of described first object delivery temperature and described first delivery temperature.
11. devices according to claim 9, is characterized in that, described device also comprises:
Second detecting unit, for detecting the 3rd operational factor and the 3rd service condition of described compressor, wherein, described 3rd operational factor is the operational factor that described timing time reaches described compressor after described second Preset Time, and described 3rd service condition is the service condition that described timing time reaches described compressor after described second Preset Time;
Second computing unit, for calculating the second target exhaust temperature according to described 3rd operational factor and described 3rd service condition;
3rd detecting unit, for detecting the second delivery temperature of described compressor, wherein, described second delivery temperature is the delivery temperature that described timing time reaches described compressor after described second Preset Time;
Judging unit, for judging whether the difference of described second target exhaust temperature and described second delivery temperature is greater than the second preset difference value;
3rd computing unit, for when the difference of described second target exhaust temperature and described second delivery temperature is greater than described second preset difference value, according to mathematic interpolation the 3rd opening value of described second target exhaust temperature and described second delivery temperature; And
3rd control unit, for controlling the aperture of described electric expansion valve to described 3rd opening value.
12. 1 kinds of air-conditioners, is characterized in that, described air-conditioner comprises the control device of the electric expansion valve according to any one of claim 9 to claim 11.
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