CN104654529A - 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
- Publication number
- CN104654529A CN104654529A CN201510059490.7A CN201510059490A CN104654529A CN 104654529 A CN104654529 A CN 104654529A CN 201510059490 A CN201510059490 A CN 201510059490A CN 104654529 A CN104654529 A CN 104654529A
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- Prior art keywords
- air
- expansion valve
- superheat
- degree
- electric expansion
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
Abstract
The invention discloses a control method of an electronic expansion valve during heating operation of a variable frequency air conditioner. The reference opening of the electronic expansion valve is equal to the product of a reference opening coefficient and compressor frequency; the numerical value of the reference opening coefficient is related to outdoor environment temperature and the compressor frequency. When the outdoor temperature and/or the compressor frequency change(s), the electronic expansion valve can be quickly and rationally adjusted to the most proper opening. The rationality and the response speed for the adjustment of the electronic expansion valve can be improved, the heating effect of the air conditioner is improved, and the heating efficiency of the air conditioner is fully improved.
Description
[technical field]
The present invention relates to air conditioning control method, particularly relate to the control method of electric expansion valve during a kind of convertible frequency air-conditioner heating operation.
[background technology]
Current convertible frequency air-conditioner popularity rate improves gradually, uses electric expansion valve to get more and more as the convertible frequency air-conditioner of restricting element.Existing convertible frequency air-conditioner is generally adopt the return-air degree of superheat to control, and the return-air degree of superheat refers to the difference of compressor suction temperature and condenser temperature.Overheated setting target zone, when the degree of superheat is greater than the higher limit of target zone, expansion valve opening increases, and when the degree of superheat is less than the lower limit of target zone, expansion valve opening reduces, and object is maintained in the target zone of setting the return-air degree of superheat.
Two kinds of return-air control method for overheat are more common:
The first is: program has first established the valve opening that compressor frequency is corresponding, uncomfortable valve opening in compressor start 7 minutes; Electronic expansion presses the corresponding valve opening of compressor frequency; Press the corresponding valve opening of compressor frequency and the return-air degree of superheat after 7 minutes to control to combine and regulate.Its shortcoming is, when outdoor environment temperature raises suddenly or reduces, this method can only be when compressor frequency changes, and the valve opening of benchmark just can change.It is the valve opening that can not regulate benchmark that outdoor environment changes, and can only be regulated by temperature, but degree of superheat adjustment is again slowly, in this way descend when outdoor temperature is suddenlyd change, suitable aperture can not be adjusted to fast, affect air-conditioning heating effect, reduce heating efficiency.
The second is: program has first established the valve opening that outdoor environment temperature is corresponding, uncomfortable valve opening in compressor start 7 minutes, and electronic expansion presses the corresponding valve opening of outdoor environment temperature; Control to combine by the corresponding valve opening of outdoor temperature and the return-air degree of superheat after 7 minutes and regulate.Its shortcoming is, this method can only be when changing according to outdoor temperature, and the valve opening of benchmark just can change.Compressor frequency change can not regulate the valve opening of benchmark, and valve opening can only be regulated by temperature, but degree of superheat adjustment is again slowly; In this way descend when compressor frequency suddenlys change, expansion valve can not be adjusted to suitable aperture fast, affects air-conditioning heating effect, reduces air-conditioning heating efficiency.
Above-mentioned two kinds of control methods are accurate all not, there is certain limitation, when outdoor temperature or compressor frequency sudden change, or outdoor temperature and compressor frequency are when changing simultaneously, control method is single, can not comprehensive while quick adjustment valve opening, cause valve to be adjusted to the most suitable aperture of heating rapidly and accurately.Affect air-conditioning heating effect, reduce air-conditioning heating efficiency.
[summary of the invention]
The technical problem to be solved in the present invention is to provide one, and no matter outdoor temperature or compressor frequency change, the reference opening amount of electric expansion valve can adjust according to outdoor environment temperature and compressor frequency, the control method of the electric expansion valve during convertible frequency air-conditioner heating operation of good energy-conserving effect.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, the control method of electric expansion valve during a kind of convertible frequency air-conditioner heating operation, and the reference opening amount of electric expansion valve equals reference opening amount coefficient and is multiplied by compressor frequency; The numerical value of reference opening amount coefficient is relevant to outdoor environment temperature and compressor frequency.
The control method of electric expansion valve during above-described convertible frequency air-conditioner heating operation, outdoor environment temperature is divided into a plurality of subregion according to temperature height; Each outdoor environment temperature subregion is again according to the corresponding a plurality of reference opening amount coefficient of the size of compressor frequency.
The control method of electric expansion valve during above-described convertible frequency air-conditioner heating operation, in operation of air conditioner process, the aperture of electric expansion valve is made up of reference opening amount and offset, by the numerical value judging the return-air degree of superheat interval time of setting, according to the size determination offset of the return-air degree of superheat, compensate accumulation:
Return-air degree of superheat Ts=Tsu-Tc;
Wherein,
Tsu: compressor return air temperature;
Tc: condenser temperature;
1) the return-air degree of superheat is greater than the higher limit of setting, valve opening=current aperture+offset;
Offset=K2 × (V_ing/ (((V_max – V_min)/2)+V_min)) × (Ts-T1);
2) the return-air degree of superheat is between the upper limit and lower limit of setting, and valve opening remains unchanged;
3) the return-air degree of superheat is less than the lower limit of setting, valve opening=current aperture-offset.
Offset=K2 × (V_ing/ (((V_max – V_min)/2)+V_min)) × (T2-Ts);
Wherein, K2: the penalty coefficient of setting;
T1: heat the degree of superheat upper limit;
T2: heat degree of superheat lower limit;
V_max: the maximum opening of valve work;
V_min: the minimum aperture of valve work;
V_ing: the current aperture of electric expansion valve.
The control method of electric expansion valve during above-described convertible frequency air-conditioner heating operation, the acquiescence value of penalty coefficient is 6; The acquiescence value heating the degree of superheat upper limit is 3; The acquiescence value heating degree of superheat lower limit is-2; The acquiescence value of valve work maximum opening is 470; The acquiescence value of the minimum aperture of valve work is 80.
The control method of electric expansion valve during above-described convertible frequency air-conditioner heating operation, in operation of air conditioner process, when compressor frequency and/or outdoor temperature change, recalculates reference opening amount value; The aperture of electric expansion valve is again Calculation Basis opening value and the algebraical sum of accumulated compensation value before.
The control method of electric expansion valve during above-described convertible frequency air-conditioner heating operation, just starts to compensate through the time of setting after air-conditioning start.
The present invention is when outdoor temperature and/or compressor frequency change, and the reference opening amount of electric expansion valve can adjust according to outdoor environment temperature and compressor frequency, and electric expansion valve can reasonably be adjusted to most suitable aperture fast.Reasonability and the reaction speed of electronic expansion valve regulation can be improved, improve air-conditioning heating effect, fully improve air-conditioning heating efficiency.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
The adjustment process schematic diagram of control method for electronic expansion valve when Fig. 1 is embodiment of the present invention convertible frequency air-conditioner heating operation.
The flow chart of control method for electronic expansion valve when Fig. 2 is embodiment of the present invention convertible frequency air-conditioner heating operation.
[detailed description of the invention]
During convertible frequency air-conditioner heating operation of the present invention, the reference opening amount of electric expansion valve combines according to outdoor environment temperature and compressor frequency to calculate, and when outdoor temperature or compressor frequency change, can be adjusted to most suitable aperture in time.
Aperture residing for electric expansion valve compensation value calculation is current according to electric expansion valve is combined with the return-air degree of superheat and calculates, and this compensation method is more accurate.
1, reference opening amount calculates:
Formula one: reference opening amount=K1 × compressor frequency
K1 is reference opening amount coefficient
Reference opening amount coefficient divides respectively by outdoor environment temperature and compressor frequency.
According to outdoor environment temperature, be divided into 8 regions: A district, B district, C district, D district, E district, F district, as shown in Table 1.
Each outdoor environment temperature subregion is divided into 3 coefficients according to the size of compressor frequency again, always has 24 coefficients, as shown in Table 2.
2, air-conditioning start heats, and after compressor operating a period of time, electric expansion valve starts there is compensation, then electronic expansion valve opening is made up of reference opening amount and offset.
According to the return-air degree of superheat, within every 60 seconds, judge once, each offset accumulation.
First calculate the current degree of superheat: return-air degree of superheat Ts=Tsu-Tc, according to the degree of superheat and setting the comparing of target zone, point three kinds of situations:
A, the degree of superheat are greater than the higher limit of setting, and valve opening increases, valve opening=current aperture+offset.
Offset=K2 × (V_ing/ (((V_max – V_min)/2)+V_min)) × (Ts-T1)
B, the degree of superheat: between the upper limit and lower limit, valve remains unchanged
C, the degree of superheat are less than the lower limit of setting, and valve opening reduces, valve opening=current aperture-offset.
Offset=K2 × (V_ing/ (((V_max – V_min)/2)+V_min)) × (T2-Ts)
Wherein,
K2: penalty coefficient acquiescence value is: 6
T1: heating degree of superheat upper limit acquiescence value is: 3
T2: heating degree of superheat lower limit acquiescence value is :-2
V_max: the maximum opening acquiescence value of valve work is: 470
V_min: the minimum aperture acquiescence value of valve work is: 80
Tsu: compressor return air temperature
Tc: condenser temperature
V_ing: the current aperture of electric expansion valve
Table one:
| Region | Outdoor temperature scope |
| A district | Outdoor temperature >=20 DEG C |
| B district | 10 DEG C≤outdoor temperature < 20 DEG C |
| C district | 5 DEG C≤outdoor temperature < 10 DEG C |
| D district | 0 DEG C≤outdoor temperature < 5 DEG C |
| E district | -6 DEG C≤outdoor temperature < 0 DEG C |
| F district | -12 DEG C≤outdoor temperature <-6 DEG C |
| G district | Outdoor temperature <-12 DEG C |
Table two:
Embodiment: convertible frequency air-conditioner start heating mode, outdoor temperature-3 DEG C, running frequency is 70HZ; When 7 minutes, suction temperature :-10 DEG C, condensation temperature is-4 DEG C.Move to the 9th minute, compressor frequency is down to 60HZ by 70HZ, and outdoor temperature is down to-7 DEG C by-3 DEG C, and suction temperature rises to-5 DEG C by-10 DEG C, condensation temperature remain-4 DEG C constant.Move to the 10th minute, outdoor temperature, compressor frequency, suction temperature, condenser temperature remain unchanged.
(convertible frequency air-conditioner programming: K2 is 6, and the degree of superheat upper limit is 3, and degree of superheat lower limit is-2, and maximum opening is 470 steps, and minimum aperture is 80 steps)
(1) compressor start pressed reference opening amount in 7 minutes:
Outdoor temperature-3 DEG C corresponds to the E subregion of table one, corresponding E subregion in table two, COEFFICIENT K 1=2.6 during running frequency 80HZ:
Reference opening amount=K1 × compressor frequency
＝2.6×70
=182 steps
The reference opening amount calculating expansion valve in compressor start 7 minutes is 208 steps;
(2) compressor start is after 7 minutes, calculates electric expansion valve offset:
Return-air degree of superheat Ts=Tsu-Tc
＝-10–(-4)
＝-6
Set degree of superheat lower limit is-2, now calculates the lower limit that the gained return-air degree of superheat is less than the set degree of superheat, and valve opening needs to reduce
Data are substituted into formula:
Offset=K2 × (V_ing/ (((V_max – V_min)/2)+V_min)) × (T2-Ts)
＝6×(182/(((470–80)/2)+80))×(-2–(-6))
＝6×(182/(195+80))×4
＝6×0.66×4
=16 steps
Calculate according to the degree of superheat, start to compensate 18 steps after the 7th minute, show that the current aperture of expansion valve is: 182-16=166 walks
(3) owing to having entered single compensation, so the current aperture of valve changes, so the second offset is:
Offset=K2 × (V_ing/ (((V_max – V_min)/2)+V_min)) × (T2-Ts)
＝6×(166/(((470–80)/2)+80))×(-2–(-6))
＝6×(166/(195+80))×4
＝6×0.60×4
=15 steps
Calculate according to the degree of superheat, after the 7th minute, second time is compensated for as 16 steps, show that the current aperture of valve is: 182-(16+15)=151 step
(4), during compressor operating to 9 minute, compressor frequency and outdoor temperature all change, and compressor frequency is down to 60HZ by 70HZ, and outdoor temperature is down to-7 DEG C by-3 DEG C.; Compressor frequency changes, and the reference opening amount of valve changes.Twice offset is adding up always before, and continuously effective.Now need to recalculate reference opening amount.
Current compression unit frequency is 60HZ, and outdoor temperature is-7 DEG C, F district, and the K1 that 60HZ. is corresponding is: 2.5 reference opening amount=K1 × compressor frequency
＝2.5×60
=150 steps
Return-air degree of superheat Ts=Tsu-Te
＝-5-(-4)
＝-1
The return-air degree of superheat is between the upper limit and lower limit, and valve compensation value keeps original constant.
Effectively, the compensation of step (2) and step (3) subtracts direction in the offset accumulation of step (2) and step (3).
So, the current aperture=reference opening amount value-accumulated compensation value before of valve
＝150–31
=119 steps
(5), during compressor operating to 10 minute, outdoor temperature, compressor frequency, the degree of superheat remain unchanged.So valve opening remains unchanged.
Compared with prior art, the control method for electronic expansion valve of the above embodiment of the present invention, when heating operation, when outdoor temperature change, compressor frequency changes, or both changes simultaneously, and electric expansion valve can reasonably be adjusted to most suitable aperture fast.Reasonability and the reaction speed of electronic expansion valve regulation can be improved, improve air-conditioning heating effect, fully improve air-conditioning heating efficiency.
Note: compressor frequency=compressor rotary speed/60, compressor rotary speed=compressor frequency × 60; Such as, when compressor frequency is 70HZ, compressor rotary speed=70 × 60=4200rpm/min.
Claims (6)
1. the control method of electric expansion valve during convertible frequency air-conditioner heating operation, it is characterized in that, the reference opening amount of electric expansion valve equals reference opening amount coefficient and is multiplied by compressor frequency; The numerical value of reference opening amount coefficient is relevant to outdoor environment temperature and compressor frequency.
2. the control method of electric expansion valve during convertible frequency air-conditioner heating operation according to claim 1, is characterized in that, outdoor environment temperature is divided into a plurality of subregion according to temperature height; Each outdoor environment temperature subregion is again according to the corresponding a plurality of reference opening amount coefficient of the size of compressor frequency.
3. the control method of electric expansion valve during convertible frequency air-conditioner heating operation according to claim 1, it is characterized in that, in operation of air conditioner process, the aperture of electric expansion valve is made up of reference opening amount and offset; By the numerical value judging the return-air degree of superheat interval time of setting, according to the size determination offset of the return-air degree of superheat, compensate accumulation:
Return-air degree of superheat Ts=Tsu-Tc;
Wherein,
Tsu: compressor return air temperature;
Tc: condenser temperature;
1) the return-air degree of superheat is greater than the higher limit of setting, valve opening=current aperture+offset;
Offset=K2 × (V_ing/ (((V_max – V_min)/2)+V_min)) × (Ts-T1);
2) the return-air degree of superheat is between the upper limit and lower limit of setting, and valve opening remains unchanged;
3) the return-air degree of superheat is less than the lower limit of setting, valve opening=current aperture-offset;
Offset=K2 × (V_ing/ (((V_max – V_min)/2)+V_min)) × (T2-Ts);
Wherein, K2: the penalty coefficient of setting;
T1: heat the degree of superheat upper limit;
T2: heat degree of superheat lower limit;
V_max: the maximum opening of valve work;
V_min: the minimum aperture of valve work;
V_ing: the current aperture of electric expansion valve.
4. the control method of electric expansion valve during convertible frequency air-conditioner heating operation according to claim 3, it is characterized in that, the acquiescence value of penalty coefficient is 6; The acquiescence value heating the degree of superheat upper limit is 3; The acquiescence value heating degree of superheat lower limit is-2; The acquiescence value of valve work maximum opening is 470; The acquiescence value of the minimum aperture of valve work is 80.
5. the control method of electric expansion valve during convertible frequency air-conditioner heating operation according to claim 3, is characterized in that, in operation of air conditioner process, when compressor frequency and/or outdoor temperature change, recalculates reference opening amount value; The aperture of electric expansion valve is again Calculation Basis opening value and the algebraical sum of accumulated compensation value before.
6. the control method of electric expansion valve during convertible frequency air-conditioner heating operation according to claim 3, is characterized in that, just starts to compensate after air-conditioning start through the time of setting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510059490.7A CN104654529A (en) | 2015-02-03 | 2015-02-03 | Control method of electronic expansion valve during heating operation of variable frequency air conditioner |
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|---|---|---|---|
| CN201510059490.7A CN104654529A (en) | 2015-02-03 | 2015-02-03 | Control method of electronic expansion valve during heating operation of variable frequency air conditioner |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105864972A (en) * | 2016-04-13 | 2016-08-17 | 广东美芝制冷设备有限公司 | Variable frequency air conditioner system and control methods thereof |
| CN106052231A (en) * | 2016-07-04 | 2016-10-26 | 青岛海尔空调器有限总公司 | Method for adjusting electronic expansion valve of air conditioner |
| CN106642563A (en) * | 2016-12-13 | 2017-05-10 | 青岛海尔空调器有限总公司 | Control method of air-conditioner expansion valve, control device and air-conditioner |
| CN108088041A (en) * | 2017-12-06 | 2018-05-29 | 广东美的制冷设备有限公司 | Control method, radiation air-conditioner and the storage medium of electric expansion valve |
| CN109028491A (en) * | 2018-08-13 | 2018-12-18 | 宁波奥克斯电气股份有限公司 | A kind of frequency converting air-conditioner compressor soft-start method, system and air conditioner |
| CN111594975A (en) * | 2020-03-03 | 2020-08-28 | 青岛海尔空调器有限总公司 | Control method and control device for cleaning air conditioner and air conditioner |
| CN111692736A (en) * | 2020-06-04 | 2020-09-22 | 广东美的制冷设备有限公司 | Control method of electronic expansion valve and air conditioning system |
| CN114963542A (en) * | 2021-02-18 | 2022-08-30 | 青岛海尔新能源电器有限公司 | Water heater control method and device, water heater and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105864972A (en) * | 2016-04-13 | 2016-08-17 | 广东美芝制冷设备有限公司 | Variable frequency air conditioner system and control methods thereof |
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| CN106052231B (en) * | 2016-07-04 | 2019-05-31 | 青岛海尔空调器有限总公司 | The method for adjusting air conditioner electric expansion valve |
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| CN106642563A (en) * | 2016-12-13 | 2017-05-10 | 青岛海尔空调器有限总公司 | Control method of air-conditioner expansion valve, control device and air-conditioner |
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| CN108088041A (en) * | 2017-12-06 | 2018-05-29 | 广东美的制冷设备有限公司 | Control method, radiation air-conditioner and the storage medium of electric expansion valve |
| CN108088041B (en) * | 2017-12-06 | 2021-06-22 | 广东美的制冷设备有限公司 | Control method of electronic expansion valve, radiation air conditioner and storage medium |
| CN109028491A (en) * | 2018-08-13 | 2018-12-18 | 宁波奥克斯电气股份有限公司 | A kind of frequency converting air-conditioner compressor soft-start method, system and air conditioner |
| CN109028491B (en) * | 2018-08-13 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Variable frequency air conditioner compressor soft start method and system and air conditioner |
| CN111594975A (en) * | 2020-03-03 | 2020-08-28 | 青岛海尔空调器有限总公司 | Control method and control device for cleaning air conditioner and air conditioner |
| CN111692736A (en) * | 2020-06-04 | 2020-09-22 | 广东美的制冷设备有限公司 | Control method of electronic expansion valve and air conditioning system |
| CN114963542A (en) * | 2021-02-18 | 2022-08-30 | 青岛海尔新能源电器有限公司 | Water heater control method and device, water heater and storage medium |
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Application publication date: 20150527 |