CN102401523A - Control method of electronic expansion valve during heating operation of variable frequency air conditioner - Google Patents
Control method of electronic expansion valve during heating operation of variable frequency air conditioner Download PDFInfo
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- CN102401523A CN102401523A CN 201110386264 CN201110386264A CN102401523A CN 102401523 A CN102401523 A CN 102401523A CN 201110386264 CN201110386264 CN 201110386264 CN 201110386264 A CN201110386264 A CN 201110386264A CN 102401523 A CN102401523 A CN 102401523A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 238000001704 evaporation Methods 0.000 claims description 11
- 230000005494 condensation Effects 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 6
- 239000002826 coolant Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000009102 absorption Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 230000006835 compression Effects 0.000 description 1
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Abstract
The invention discloses a control method of an electronic expansion valve during heating operation of an inverter air conditioner, wherein the electronic expansion valve controls the opening degree of the electronic expansion valve according to the exhaust superheat degree and the suction superheat degree of a compressor during heating of the inverter split air conditioner, and the exhaust superheat degree of the compressor is not influenced by the length of an online pipeline between an indoor unit and an outdoor unit to generate deviation, so that the problem of fluctuation of the electronic expansion valve of the inverter air conditioner with a longer online pipeline between the outdoor unit and the indoor unit during heating can be solved. The invention controls the exhaust temperature of the compressor, so that the exhaust temperature of the compressor is not too high, thereby ensuring the normal operation of the compressor and the normal operation of an air conditioning system.
Description
Technical field
The present invention relates to a kind of control method, relate to the control method of a kind of electric expansion valve when the convertible frequency air-conditioner heating operation or rather.
Background technology
The frequency conversion capacity system; System's cold medium flux is wide according to the load change scope in running, conventional throttle device such as capillary, orifice plate, heating power expansion valve etc., because of adjustable range narrow; Stable operation that can not safeguards system is so all generally adopt electric expansion valve to carry out Flow-rate adjustment.The flow of electronic expansion valve adjustable range is big, and Driving technique is ripe, and control realizes the high-efficient operation of system flexibly easily, in the service life of safeguards system, in frequency conversion varying capacity system, progressively becomes main throttle style.
Small-sized convertible frequency air-conditioner heating operation through the simulation return-air degree of superheat, is regulated control to electric expansion valve usually.The return-air degree of superheat is exactly the suction temperature numerical value of the cold-producing medium of compressor in the air-conditioning system, relatively the lift-off value of back pressure saturation temperature.The saturation temperature that back pressure is corresponding in small-sized convertible frequency air-conditioner is all come analog detection through temperature sensor on the evaporation side heat exchanger.For the split convertible frequency air-conditioner, the influence of the pressure loss of frequency and evaporating pressure heat exchanging device is bigger.Higher in frequency, when evaporator refrigerant temperature was low, the pressure of compressor return air and the detection numerical value deviation through the heat exchanger coils temperature sensor will be very big.Can cause the electronic Expansion Valve Control deviation like this, cause electronic expansion valve opening less than normal, thereby cause the uneconomical even unstable of operation.
The patent No. is that ZL200710112061.7, patent name are that " method of air-conditioning and its electric expansion valve of control " and the patent No. are that 200710090097.X, patent name have proposed a kind of proportion differential and fuzzy algorithmic approach respectively for " electronic Expansion Valve Control method ", has solved the problem that electric expansion valve fluctuateed in adjustment process when air-conditioning heated.Because these methods are only controlled electric expansion valve according to the suction temperature of air-conditioning; The convertible frequency air-conditioner that online pipeline between off-premises station and the indoor set is relatively shorter, online pressure loss in piping is smaller, makes the degree of superheat of the return-air that air-conditioning system detects compare with actual numerical value; Deviation is just smaller; Therefore, more than two control methods electric expansion valve fluctuation problem in adjustment process of short convertible frequency air-conditioner of the online pipeline between off-premises station and the indoor set can solve air-conditioning and heat the time, and for the long convertible frequency air-conditioner of online pipeline between off-premises station and the indoor set; Because transducer air conditioning is along with the growth of online pipeline length; The pressure loss of system pipeline can increase, and the degree of superheat of the return-air that air-conditioning system detects is compared with actual numerical value, and deviation can be bigger; Make the best return-air degree of superheat of air-conditioning system be not sure of; Therefore, it is obviously inaccurate to control electric expansion valve through above two kinds of methods, thereby also just can't solve the fluctuation problem of electric expansion valve in adjustment process of the long convertible frequency air-conditioner of the online pipeline between the off-premises station and indoor set when heating.In addition, more than two kinds of methods all delivery temperature is not controlled in the process of control, and can damage compressor during excessive discharge temperature, thereby influence the safe operation of system.
Summary of the invention
The technical problem that the present invention will solve is; A kind of exhaust and suction superheat according to system is provided; Electronic expansion valve opening is adjusted to the action scope near most economical running automatically; Protection system reliability service and safe operation, and the control method of electric expansion valve when the convertible frequency air-conditioner heating operation of the fluctuation problem of electric expansion valve in adjustment process of the long convertible frequency air-conditioner of the online pipeline between off-premises station and the indoor set can solve heating operation the time.
Technical solution of the present invention is, a kind of control method of electric expansion valve when the convertible frequency air-conditioner heating operation with following steps is provided, and may further comprise the steps:
Exhaust gas temperature sensor (4) is located at the exhaust outlet of compressor (1.1), and the temperature of establishing described exhaust gas temperature sensor (4) mensuration is Td; Suction temperature sensor (5) is located at the air entry of compressor (1.1), and the temperature of establishing described suction temperature sensor (5) mensuration is Ts; Outdoor heat exchanger condensation temperature sensor (6) is located on the outdoor heat exchanger (1.4), and the temperature of establishing described outdoor heat exchanger condensation temperature sensor (6) mensuration is Tc; Indoor heat exchanger evaporating temperature sensor (7) is located on the indoor heat exchanger (2.2), and the temperature of establishing described indoor heat exchanger evaporating temperature sensor (7) mensuration is Te; Outdoor environment temperature sensor (8) is located on the off-premises station (1), and the temperature of establishing described outdoor environment temperature sensor (8) mensuration is Tao;
(1) indoor set (2) is set at the state of heating; Carry out the controller that communication is transferred to the enabling signal of indoor set (2) off-premises station (1) through the controller of indoor set (2) and the controller of off-premises station (1); The controller of off-premises station (1) receives after indoor set (2) enabling signal, and electric expansion valve (1.5) aperture is resetted, and (K is an integer to be transferred to maximum opening K after aperture resets; And begin to start compressor (1.1) value 400 ~ 500);
(2) after compressor start t1 (t1 is 5 ~ 20 integers) second; The controller of off-premises station is adjusted to the m (m is 90 ~ 140 integers) of aperture with electronic expansion valve opening, and the m aperture continues the first adjusting that the back gets into electric expansion valve in t2 (t2 is 120 ~ 150 integers) second;
(3) electric expansion valve is regulated for the first time, the aperture of electric expansion valve was pressed following principle regulate once in the every interval t3 of microprocessor (t3 is 15 ~ 45 integers) second:
This regulates back electronic expansion valve opening P
n=this regulates preceding aperture P
N-1The aperture Δ P of+adjusting
n(P represents the aperture of electric expansion valve, the first number of times of regulating of n representative, Δ P
nRepresent the increment of electric expansion valve) in the aperture of this adjusting;
The aperture Δ P that regulates
n=(Ts-Te-5) * Kp1 (Kp1 is a coefficient, is 2 ~ 6 integer);
The temperature T d that measures when exhaust gas temperature sensor>To (To is a constant, is 55 ~ 65 constant) or the time of regulating for the first time is during greater than 150s, and get into the secondary of electric expansion valve is regulated;
If this moment | Ts-Te-2|>4 o'clock, leap to step (five);
(4) electric expansion valve carries out secondary and regulates, when satisfying | and during the condition of Ts-Te-2|≤4, the aperture of electric expansion valve regulated once by following principle in the every interval t4 of microprocessor (t4 is 50 ~ 60 integers) second:
(1) as Tao >-2 when spending,
This regulates back electronic expansion valve opening P
m=this regulates preceding aperture P
M-1The aperture Δ P of+adjusting
m(P represents the aperture of electric expansion valve, the number of times that on behalf of secondary, m regulate, Δ P
mRepresent electric expansion valve to regulate the increment of this adjusting aperture in the control) at secondary;
The aperture Δ P that regulates
m=[Tdm-(Tt+35)] * Kp 2/T+ Kp 2 * Δ Tdm;
Tt=max (35, Te), Tt get 35 with Te in maximum;
Δ Tdm is the rate of change of Tdm, Δ Tdm=Tdm-Tdm-1;
KP2 is 2 ~ 4 constants, and T is 8 ~ 16 constants;
(2) when Tao≤-2 are spent,
This regulates back electronic expansion valve opening Pm=, and this regulates the aperture Δ P that preceding aperture Pm-1+ regulates
m
The aperture Δ P that regulates
m=(Tdm-65) * Kp2;
(5) as | Ts-Te-2|>4 the time, electric expansion valve remains unchanged.
After adopting above structure, the control method of electric expansion valve of the present invention when the convertible frequency air-conditioner heating operation compared with prior art has the following advantages:
Because electric expansion valve of the present invention carries out aperture control according to compressor air-discharging and suction superheat to electric expansion valve when the frequency conversion split-type air conditioner heats; The compressor air-discharging degree of superheat can not receive the online pipeline between indoor set and the off-premises station length influence and produce deviation, thereby can solve the fluctuation problem of electric expansion valve in adjustment process of the long convertible frequency air-conditioner of the online pipeline between the off-premises station and indoor set when heating.Because the present invention also controls compressor exhaust temperature, make the delivery temperature of compressor can be not too high, thereby can guarantee that compressor normally moves, guarantee that air-conditioning system can normally move.Control method of the present invention can realize disposable adjustment to electric expansion valve in the process of operation, compared with prior art, significantly reduced the adjustment number of times to electric expansion valve, can prolong the service life of electric expansion valve, realizes the reliability service of system.
Description of drawings
Fig. 1 is the structural representation of the convertible frequency air-conditioner of the control method of electric expansion valve of the present invention when the convertible frequency air-conditioner heating operation.
Shown in the figure: 1, off-premises station, 1.1, compressor, 1.2, gas-liquid separator, 1.3, cross valve; 1.4, outdoor heat exchanger, 1.5, electric expansion valve, 1.6, the off-premises station blower fan, 2, indoor set; 2.1, outdoor fan, 2.2, indoor heat exchanger, 3, online pipeline, 4, exhaust gas temperature sensor; 5, suction temperature sensor, 6, outdoor heat exchanger condensation temperature sensor, 7, indoor heat exchanger evaporating temperature sensor, 8, the outdoor environment temperature sensor.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
See also shown in Figure 1ly, convertible frequency air-conditioner comprises off-premises station 1 and indoor set 2, and described off-premises station 1 is connected through online pipeline 3 with indoor set 2.Described off-premises station 1 comprises compressor 1.1, gas-liquid separator 1.2, cross valve 1.3, outdoor heat exchanger 1.4, electric expansion valve 1.5, off-premises station blower fan 1.6.Described indoor set 2 comprises indoor fan 2.1, indoor heat exchanger 2.2.The temperature sensor of convertible frequency air-conditioner comprises exhaust gas temperature sensor 4, suction temperature sensor 5, outdoor heat exchanger condensation temperature sensor 6, indoor heat exchanger evaporating temperature sensor 7, outdoor environment temperature sensor 8.Exhaust gas temperature sensor 4 is located at the exhaust outlet of compressor 1.1, and the temperature of establishing described exhaust gas temperature sensor 4 mensuration is Td.Suction temperature sensor 5 is located at the air entry of compressor 1.1, and the temperature of establishing described suction temperature sensor 5 mensuration is Ts.Outdoor heat exchanger condensation temperature sensor 6 is located on the outdoor heat exchanger 1.4, and the temperature of establishing described outdoor heat exchanger condensation temperature sensor 6 mensuration is Tc.Indoor heat exchanger evaporating temperature sensor 7 is located on the indoor heat exchanger 2.2, and the temperature of establishing described indoor heat exchanger evaporating temperature sensor 7 mensuration is Te.Outdoor environment temperature sensor 8 is located on the off-premises station 2, and the temperature of establishing described outdoor environment temperature sensor 8 mensuration is Tao.
During the convertible frequency air-conditioner heating operation; The gaseous coolant that compressor 1.1 absorptions are come out from gas-liquid separator 1.2, compressor 1.1 gets into indoor heat exchangers 2.2, indoor fan 2.1 forced air flow with gaseous coolant compression back through cross valve 1.3; To HTHP refrigerant cooling in the indoor heat exchanger 2.2; Condensed liquid refrigerants gets into electric expansion valve 1.5 throttlings, the refrigerant inlet chamber external heat exchanger 1.4 after the throttling through one of them online pipeline 3.Off-premises station blower fan 1.6 forced air flow and indoor heat exchanger 2.2 heat exchange.Refrigerant is in outdoor heat exchanger 1.4 evaporations, and outdoor heat exchanger 1.4 absorbs heat, flashes to the gaseous coolant of low-temp low-pressure.Gaseous coolant gets into gas-liquid separator 1.2 through off-premises station 1 cross valve 1.3, and the refrigerant of process gas-liquid separator 1.2 gets into compressor 1.1 again and compresses, and heats circulation thereby accomplish one.
The control method of electric expansion valve of the present invention when the convertible frequency air-conditioner heating operation may further comprise the steps:
(1) indoor set is set at the state of heating, the controller through indoor set 2 and the controller of off-premises station 1 carry out communication the enabling signal of indoor set 2 are transferred to the controller of off-premises station 1, and the controller of off-premises station 1 receives after indoor set 2 enabling signals; Electric expansion valve 1.5 apertures are resetted; (K is an integer, and value 400 ~ 500 is in this specific embodiment to be transferred to maximum opening K after aperture resets; Described K value is 450), and begin to start compressor 1.1;
(2) after compressor start t1 (t1 is 5 ~ 20 integers, and in this specific embodiment, described t1 is 15) second; The controller of off-premises station 1 is adjusted to the m of aperture with electric expansion valve 1.5 apertures, and (m is 90 ~ 140 integers; In this specific embodiment, described m is 120), the m aperture continues t2, and (t2 is 120 ~ 150 integers; In this specific embodiment, described t2 is 150) the first adjusting of entering electric expansion valve 1.5 after second;
(3) electric expansion valve 1.5 is regulated for the first time, the aperture of electric expansion valve 1.5 was pressed following principle regulate once in the every interval t3 of microprocessor (t3 is 15 ~ 45 integers, and in this specific embodiment, described t3 is 15s) second:
This regulates back electronic expansion valve opening P
n=this regulates preceding aperture P
N-1The aperture Δ P of+adjusting
n(P represents the aperture of electric expansion valve, the first number of times of regulating of n representative, Δ P
nRepresent the increment of electric expansion valve) in the aperture of this adjusting;
The aperture Δ P that regulates
n=(Ts-Te-5) * Kp1 (Kp1 is a coefficient, is 2 ~ 6 integer, and in this specific embodiment, described Kp1 is 3);
The temperature T d that measures when exhaust gas temperature sensor>To (To is a constant, is 55 ~ 65 constant, and in this specific embodiment, described to is 60) or the time of regulating for the first time is during greater than 150s, and get into the secondary of electric expansion valve is regulated;
If this moment | Ts-Te-2|>4 o'clock, leap to step (five);
(4) electric expansion valve carries out the secondary adjusting; When satisfying | during the condition of Ts-Te-2|≤4; The aperture of electric expansion valve being pressed following principle in the every interval t4 of microprocessor (t4 is 50 ~ 60 integers, and in this specific embodiment, described t4 is 45) second regulates once:
(1) as Tao >-2 when spending,
This regulates back electronic expansion valve opening P
m=this regulates preceding aperture P
M-1The aperture Δ P of+adjusting
m(P represents the aperture of electric expansion valve, the number of times that on behalf of secondary, m regulate, Δ P
mRepresent electric expansion valve to regulate the increment of this adjusting aperture in the control) at secondary;
The aperture Δ P that regulates
m=[Tdm-(Tt+35)] * Kp 2/T+ Kp 2 * Δ Tdm;
Tt=max (35, Te), Tt get 35 with Te in maximum;
Δ Tdm is the rate of change of Tdm, Δ Tdm=Tdm-Tdm-1;
KP2 is 2 ~ 4 constants, and T is 8 ~ 16 constants;
(2) when Tao≤-2 are spent,
This regulates back electronic expansion valve opening Pm=, and this regulates the aperture Δ P that preceding aperture Pm-1+ regulates
m
The aperture Δ P that regulates
m=(Tdm-65) * Kp2;
(5) as | Ts-Te-2|>4 the time, electric expansion valve remains unchanged.
Claims (1)
1. the control method of an electric expansion valve when the convertible frequency air-conditioner heating operation may further comprise the steps:
Exhaust gas temperature sensor (4) is located at the exhaust outlet of compressor (1.1), and the temperature of establishing described exhaust gas temperature sensor (4) mensuration is Td; Suction temperature sensor (5) is located at the air entry of compressor (1.1), and the temperature of establishing described suction temperature sensor (5) mensuration is Ts; Outdoor heat exchanger condensation temperature sensor (6) is located on the outdoor heat exchanger (1.4), and the temperature of establishing described outdoor heat exchanger condensation temperature sensor (6) mensuration is Tc; Indoor heat exchanger evaporating temperature sensor (7) is located on the indoor heat exchanger (2.2), and the temperature of establishing described indoor heat exchanger evaporating temperature sensor (7) mensuration is Te; Outdoor environment temperature sensor (8) is located on the off-premises station (1), and the temperature of establishing described outdoor environment temperature sensor (8) mensuration is Tao;
(1) indoor set (2) is set at the state of heating; Carry out the controller that communication is transferred to the enabling signal of indoor set (2) off-premises station (1) through the controller of indoor set (2) and the controller of off-premises station (1); The controller of off-premises station (1) receives after indoor set (2) enabling signal, and electric expansion valve (1.5) aperture is resetted, and (K is an integer to be transferred to maximum opening K after aperture resets; And begin to start compressor (1.1) value 400 ~ 500);
(2) after compressor start t1 (t1 is 5 ~ 20 integers) second; The controller of off-premises station is adjusted to the m (m is 90 ~ 140 integers) of aperture with electronic expansion valve opening, and the m aperture continues the first adjusting that the back gets into electric expansion valve in t2 (t2 is 120 ~ 150 integers) second;
(3) electric expansion valve is regulated for the first time, the aperture of electric expansion valve was pressed following principle regulate once in the every interval t3 of microprocessor (t3 is 15 ~ 45 integers) second:
This regulates back electronic expansion valve opening P
n=this regulates preceding aperture P
N-1The aperture Δ P of+adjusting
n(P represents the aperture of electric expansion valve, the first number of times of regulating of n representative, Δ P
nRepresent the increment of electric expansion valve) in the aperture of this adjusting;
The aperture Δ P that regulates
n=(Ts-Te-5) * Kp1 (Kp1 is a coefficient, is 2 ~ 6 integer);
The temperature T d that measures when exhaust gas temperature sensor>To (To is a constant, is 55 ~ 65 constant) or the time of regulating for the first time is during greater than 150s, and get into the secondary of electric expansion valve is regulated;
If this moment | Ts-Te-2|>4 o'clock, leap to step (five);
(4) electric expansion valve carries out secondary and regulates, when satisfying | and during the condition of Ts-Te-2|≤4, the aperture of electric expansion valve regulated once by following principle in the every interval t4 of microprocessor (t4 is 50 ~ 60 integers) second:
(1) as Tao >-2 when spending,
This regulates back electronic expansion valve opening P
m=this regulates preceding aperture P
M-1The aperture Δ P of+adjusting
m(P represents the aperture of electric expansion valve, the number of times that on behalf of secondary, m regulate, Δ P
mRepresent electric expansion valve to regulate the increment of this adjusting aperture in the control) at secondary;
The aperture Δ P that regulates
m=[Tdm-(Tt+35)] * Kp 2/T+ Kp 2 * Δ Tdm;
Tt=max (35, Te), Tt get 35 with Te in maximum;
Δ Tdm is the rate of change of Tdm, Δ Tdm=Tdm-Tdm-1;
KP2 is 2 ~ 4 constants, and T is 8 ~ 16 constants;
(2) when Tao≤-2 are spent,
This regulates back electronic expansion valve opening Pm=, and this regulates the aperture Δ P that preceding aperture Pm-1+ regulates
m
The aperture Δ P that regulates
m=(Tdm-65) * Kp2;
(5) as | Ts-Te-2|>4 the time, electric expansion valve remains unchanged.
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| CN 201110386264 CN102401523A (en) | 2011-11-29 | 2011-11-29 | Control method of electronic expansion valve during heating operation of variable frequency air conditioner |
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| CN 201110386264 CN102401523A (en) | 2011-11-29 | 2011-11-29 | Control method of electronic expansion valve during heating operation of variable frequency air conditioner |
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