CN111854031A - Control method of electronic expansion valve, control method of air conditioner and air conditioner - Google Patents
Control method of electronic expansion valve, control method of air conditioner and air conditioner Download PDFInfo
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- CN111854031A CN111854031A CN202010668424.0A CN202010668424A CN111854031A CN 111854031 A CN111854031 A CN 111854031A CN 202010668424 A CN202010668424 A CN 202010668424A CN 111854031 A CN111854031 A CN 111854031A
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- 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
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- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- 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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- 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
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- 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
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
Abstract
The application provides a control method of an electronic expansion valve, a control method of an air conditioner and the air conditioner. The control method of the electronic expansion valve comprises the following steps: when the air conditioner is in a refrigeration mode, acquiring the outdoor environment temperature; adjusting the valve step of the electronic expansion valve to a starting valve step corresponding to the outdoor environment temperature; detecting whether the starting valve step reaches a preset valve step lower limit or not; when the starting valve step reaches a preset valve step lower limit, controlling the air conditioner to continuously operate for t1 time; detecting whether the air conditioner exhaust temperature reaches a target exhaust temperature; when the air conditioner exhaust temperature does not reach the target exhaust temperature, acquiring a difference T1-T2 between the indoor environment temperature T1 and the indoor unit outlet air temperature T2; and if the T1-T2 is less than a, the electronic expansion valve is forced to increase the preset valve step. According to the control method of the electronic expansion valve, the problem that the refrigeration requirement of an internal unit cannot be met due to the fact that the opening degree of the valve is too small when the air conditioner is started can be solved.
Description
Technical Field
The application relates to the technical field of air conditioning, in particular to a control method of an electronic expansion valve, a control method of an air conditioner and the air conditioner.
Background
The electronic expansion valve is used as a common throttling element of the air conditioner, the adjustment of the electronic expansion valve in the running process of the air conditioner is related to the reliability of the whole air conditioning system, when the unit is in a low-temperature environment, if refrigeration is started at the moment, the outdoor condensation effect is excellent, the establishment of the exhaust temperature of the unit is difficult, when the unit is in a state that the exhaust is delayed and cannot be established, the command received by the electronic expansion valve is continuously reduced, the flow of refrigerant of the unit is too small, the refrigerant quantity of the whole system participating in flow circulation is seriously insufficient, and the refrigeration effect of the internal unit cannot meet the refrigeration requirement.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is to provide a control method of an electronic expansion valve, a control method of an air conditioner and the air conditioner, and the problem that refrigeration requirements of an internal unit cannot be met due to the fact that the opening of a valve of the air conditioner is too small when the air conditioner is started can be solved.
In order to solve the above problem, the present application provides a control method of an electronic expansion valve, including:
when the air conditioner is in a refrigeration mode, acquiring the outdoor environment temperature;
adjusting the valve step of the electronic expansion valve to a starting valve step corresponding to the outdoor environment temperature;
detecting whether the starting valve step reaches a preset valve step lower limit or not;
When the starting valve step reaches a preset valve step lower limit, controlling the air conditioner to continuously operate for t1 time;
detecting whether the air conditioner exhaust temperature reaches a target exhaust temperature;
when the air conditioner exhaust temperature does not reach the target exhaust temperature, acquiring a difference T1-T2 between the indoor environment temperature T1 and the indoor unit outlet air temperature T2;
and if the T1-T2 is less than a, the electronic expansion valve is forced to increase the preset valve step.
Preferably, after the electronic expansion valve is forced to increase by the preset valve step, the control method further comprises:
detecting whether the operation of the air conditioner meets a preset condition or not;
and if the preset condition is met, the step of forcing the electronic expansion valve to increase the preset valve step is exited.
Preferably, the preset condition is one of the following:
the air conditioner exhaust temperature reaches the target exhaust temperature; or the like, or, alternatively,
forcing the electronic expansion valve to increase the continuous operation time after the preset valve step to reach t 2; or the like, or, alternatively,
T1-T2≥a。
preferably, before detecting whether the startup valve step reaches a preset valve step lower limit, the control method further includes:
dividing the outdoor environment temperature into temperature intervals;
and setting the lower limit of the valve step corresponding to each temperature interval.
Preferably, the temperature interval includes Δ T1, Δ T2, and Δ T3, where Δ T1 is [ a, B), [ Δ T2 is [ B, C), [ Δ T3 is [ C, D ], [ Δ T1 corresponds to a lower valve step limit of s, Δ T2 corresponds to a lower valve step limit of s + D, Δ T3 corresponds to a lower valve step limit of s + e, and 0 < D < e.
Preferably, the preset valve step is f, and f is more than or equal to 10.
Preferably, the predetermined valve step corresponding to Δ T1 is f, the predetermined valve step corresponding to Δ T2 is f + x, the predetermined valve step corresponding to Δ T3 is f + y, and 0 < x < y.
Preferably, a.gtoreq.2.
Preferably, the preset temperature difference corresponding to the delta T1 is a, the preset temperature difference corresponding to the delta T2 is a-m, the preset temperature difference corresponding to the delta T2 is a-n, and m is more than 0 and less than n.
Preferably, B-a ═ C-B ═ D-C.
Preferably, the electronic expansion valve instantaneously increases the preset valve step.
According to another aspect of the present application, there is provided a control method of an air conditioner, which controls an electronic expansion valve using the control method.
According to another aspect of the present application, there is provided an air conditioner to which the above-described control method of the electronic expansion valve or the above-described control method of the air conditioner is applied.
The application provides a control method of an electronic expansion valve, which comprises the following steps: when the air conditioner is in a refrigeration mode, acquiring the outdoor environment temperature; adjusting the valve step of the electronic expansion valve to a starting valve step corresponding to the outdoor environment temperature; detecting whether the starting valve step reaches a preset valve step lower limit or not; when the starting valve step reaches a preset valve step lower limit, controlling the air conditioner to continuously operate for t1 time; detecting whether the air conditioner exhaust temperature reaches a target exhaust temperature; when the air conditioner exhaust temperature does not reach the target exhaust temperature, acquiring a difference T1-T2 between the indoor environment temperature T1 and the indoor unit outlet air temperature T2; and if the T1-T2 is less than a, the electronic expansion valve is forced to increase the preset valve step. By the control method, under the condition of low-temperature refrigeration, the electronic expansion valve is forced to increase the valve step, the flow of refrigerant participating in circulation is increased, and the heat exchange quantity between the indoor heat exchanger and the indoor environment is increased, so that the heat absorption quantity of the refrigerant is increased, the exhaust temperature of the compressor is effectively improved, the normal operation of the compressor is ensured, the normal operation of an air conditioning system is further ensured, and the problem that the refrigeration requirement of the indoor unit cannot be met due to the fact that the opening of the valve is too small when the air conditioner is started is effectively avoided.
Drawings
Fig. 1 is a flowchart of a control method of an electronic expansion valve according to an embodiment of the present application.
Detailed Description
Referring to fig. 1 in combination, according to an embodiment of the present application, a control method of an electronic expansion valve includes: when the air conditioner is in a refrigeration mode, acquiring the outdoor environment temperature; adjusting the valve step of the electronic expansion valve to a starting valve step corresponding to the outdoor environment temperature; detecting whether the starting valve step reaches a preset valve step lower limit or not; when the starting valve step reaches a preset valve step lower limit, controlling the air conditioner to continuously operate for t1 time; detecting whether the air conditioner exhaust temperature reaches a target exhaust temperature; when the air conditioner exhaust temperature does not reach the target exhaust temperature, acquiring a difference T1-T2 between the indoor environment temperature T1 and the indoor unit outlet air temperature T2; and if the T1-T2 is less than a, the electronic expansion valve is forced to increase the preset valve step. T1 is 3min or more, preferably t1 is 10 min.
By the control method, under the condition of low-temperature refrigeration, the electronic expansion valve is forced to increase the valve step, the flow of refrigerant participating in circulation is increased, after the flow of refrigerant participating in circulation is increased, the heat exchange quantity with the outdoor environment is increased, the heat exchange quantity between the indoor heat exchanger and the indoor environment is further increased, the heat absorption quantity of the refrigerant is increased, after the refrigerant returns to the compressor, the exhaust temperature is gradually increased under the compression action of the compressor, the exhaust temperature of the compressor can be effectively increased, the target exhaust temperature is reached, the normal establishment of the exhaust temperature of the compressor is ensured, the normal operation of an air conditioning system is further ensured, and the problem that the refrigeration requirement of an inner refrigerating machine cannot be met due to the fact that the valve opening degree is too small when the air conditioner.
Preferably, in the process of forcing the electronic expansion valve to increase the preset valve step, the electronic expansion valve instantaneously increases the preset valve step, where the instantaneously increasing the preset valve step means that the time for the electronic expansion valve to increase the preset valve step does not exceed 1 s. The instantaneous increase of preset valve step can form quick response, so that the flow of refrigerant in the system is increased quickly, the flow of refrigerant in the system can be improved quickly, the heat exchange quantity between an indoor heat exchanger and the indoor environment is increased quickly, the quick establishment of exhaust temperature is facilitated, the air conditioner enters a normal operation mode quickly, and the adverse effect of a forced mode on air conditioner parts is reduced.
Since the opening degree of the electronic expansion valve is decreased according to the normal operation logic, the opening degree of the electronic expansion valve needs to be forcibly increased here, so that the electronic expansion valve increases the preset valve step.
After the electronic expansion valve is forced to increase by the preset valve step, the control method further comprises the following steps: detecting whether the operation of the air conditioner meets a preset condition or not; and if the preset condition is met, the step of forcing the electronic expansion valve to increase the preset valve step is exited.
The predetermined condition is one of the following: the air conditioner exhaust temperature reaches the target exhaust temperature; or after the electronic expansion valve is forced to increase the preset valve step, the continuous operation time reaches t 2; or, T1-T2 is more than or equal to a. In the running process of the air conditioner, as long as one of the three conditions can be met, the forced mode for forcing the electronic expansion valve to increase the preset valve step can be exited. After exiting the forced mode, whether the air conditioner is operated in the normal cooling mode may be selected according to an operation condition of the air conditioner. T2 is 3min or more, preferably, t2 is 5 min.
For the three conditions, different conditions are satisfied, and the subsequent operation steps of the air conditioner may be different.
When the air conditioner meets the condition that the exhaust temperature of the air conditioner reaches the target exhaust temperature in the forced mode, the exhaust temperature of the compressor is normally established, the electronic expansion valve is not continuously turned down, and the electronic expansion valve can be adjusted according to the indoor environment temperature, so that the air conditioner can be controlled according to the normal refrigeration mode.
When the exhaust temperature of the air conditioner is not normally established, the air conditioner is normally operated in a forced mode all the time, so that the operation time of the air conditioner in the forced mode is too long, the forced mode is not the normal operation mode of the air conditioner, only a forced means which cannot be adopted by the exhaust temperature during the operation process of the air conditioner is adopted, the parts and the like of the air conditioner can be damaged when the air conditioner is operated in the forced mode for a long time, in order to avoid the condition, when the continuous operation time of the air conditioner in the forced mode reaches the condition of t2, if the exhaust temperature of an air conditioner compressor still does not reach the target exhaust temperature at the moment, the air conditioner needs to be controlled to operate for a period of time according to a normal refrigeration mode, all the parts and the parts of the air conditioner are in a normal working environment, and then the air conditioner is controlled to enter the forced mode, the air conditioner can effectively protect the parts of the air conditioner, particularly the compressor.
When the air conditioner meets the condition that T1-T2 is not less than a in the forced mode, the temperature difference between the indoor environment temperature T1 and the indoor unit outlet air temperature T2 is overlarge, so that the heat absorbed by a refrigerant from the indoor environment is large, and when the condition that T1-T2 is not less than a is met, even if the air conditioner exits the forced operation mode at the moment, the air conditioner can still ensure that the indoor heat exchanger and the indoor environment have enough heat exchange to effectively regulate the indoor temperature, so that the problem that the refrigeration requirement of the indoor unit cannot be met due to the fact that the valve opening degree is too small can be effectively avoided.
Before detecting whether the starting valve step reaches a preset valve step lower limit, the control method further comprises the following steps: dividing the outdoor environment temperature into temperature intervals; and setting the lower limit of the valve step corresponding to each temperature interval.
Through dividing the temperature intervals and enabling each temperature interval to correspond to a mode of a valve step lower limit, the division of the temperature intervals can be thinner, accurate control over opening adjustment of the electronic expansion valve is achieved, and stable and reliable operation of the air conditioner is guaranteed.
In the present embodiment, the temperature range includes Δ T1, Δ T2, and Δ T3, where Δ T1 is [ a, B), [ Δ T2 is [ B, C), [ Δ T3 is [ C, D ], [ Δ T1 corresponds to a lower valve step limit of s, Δ T2 corresponds to a lower valve step limit of s + D, Δ T3 corresponds to a lower valve step limit of s + e, and 0 < D < e. The lower valve step limit s > 0, preferably s.gtoreq.30, more preferably s 60.
Preferably, B-a ═ C-B ═ D-C. In other embodiments, B-a ≠ C-B ≠ D-C, or B-a ≠ D-C ≠ C-B.
In this embodiment, within the temperature range of [ -20, 10], three temperature intervals are divided in total, wherein the first temperature interval is [ -20, -10 ], the second temperature interval is [ -10, 0], and the third temperature interval is [0, 10 ]. Of course, the temperature range may be divided into more temperature intervals or into fewer temperature intervals. In addition, the temperature range suitable for the control scheme of the application can be expanded, for example, the temperature range of [ -30, 10], the number of the divided temperature intervals can be adjusted according to needs, the upper and lower limit temperature difference values corresponding to each temperature interval can be the same or different, and the adjustment can be performed according to the conditions occurring in the actual control process.
D > 0, preferably, d-10. The above-mentioned e > 0, preferably, e ═ 20.
TABLE 1
| △T1 | △T2 | △T3 | |
| Temperature range | -20～-10 | -10～0 | 0～10 |
| Lower limit of valve step | s | s+10 | s+20 |
Table 1 shows the temperature interval divisions and the lower valve step limits corresponding to the temperature interval ranges of the present application.
When the air conditioner is in a low-temperature refrigeration working condition, the lower the temperature of the outdoor environment, the larger the temperature difference between the outdoor heat exchanger and the outdoor environment, the more heat which can be absorbed by the same refrigerant quantity, and the smaller the valve opening required by the air conditioner exhaust temperature suggestion, so the lower valve step limit is correspondingly smaller.
Preferably, in one embodiment, the preset adjustment valve step is f, f ≧ 10, and the adjusted valve step is s + f.
TABLE 2
| △T1 | △T2 | △T3 | |
| Temperature range | -20～-10 | -10～0 | 0～10 |
| Valve step | s+20 | s+30 | s+40 |
Table 2 shows the temperature interval division and the adjusted valve steps corresponding to the temperature interval ranges of the present application.
As can be seen from Table 2, the predetermined valve step corresponding to Δ T1 is f, the predetermined valve step corresponding to Δ T2 is f + x, the predetermined valve step corresponding to Δ T3 is f + y, and 0 < x < y. In this embodiment, f ≧ 10, preferably, f ≧ 20. x > 0, preferably, x > 10, y > 0, preferably, y > 20.
In one embodiment, a ≧ 2. In this embodiment, the preset temperature difference corresponding to each temperature range is a.
TABLE 3
| △T1 | △T2 | △T3 | |
| Temperature range | -20～-10 | -10～0 | 0～10 |
| T5 | 7 | 6 | 5 |
Table 3 shows the temperature interval division and the preset temperature difference corresponding to each temperature interval range in the present application.
As can be seen from table 3, in the embodiment, the preset temperature differences corresponding to the temperature intervals are different, the preset temperature difference corresponding to Δ T1 is a, the preset temperature difference corresponding to Δ T2 is a-m, the preset temperature difference corresponding to Δ T2 is a-n, and 0 < m < n. a is more than or equal to 2, preferably, a is 7. m > 0, preferably, m ═ 1. n > 0, preferably n ═ 2.
According to the embodiment of the application, the control method of the air conditioner adopts the control method to control the electronic expansion valve.
According to an embodiment of the present application, the air conditioner applies the control method of the electronic expansion valve described above, or the control method of the air conditioner described above.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (13)
1. A control method of an electronic expansion valve, comprising:
when the air conditioner is in a refrigeration mode, acquiring the outdoor environment temperature;
adjusting the valve step of the electronic expansion valve to a starting valve step corresponding to the outdoor environment temperature;
detecting whether the starting valve step reaches a preset valve step lower limit or not;
when the starting valve step reaches a preset valve step lower limit, controlling the air conditioner to continuously operate for t1 time;
detecting whether the air conditioner exhaust temperature reaches a target exhaust temperature;
when the air conditioner exhaust temperature does not reach the target exhaust temperature, acquiring a difference T1-T2 between the indoor environment temperature T1 and the indoor unit outlet air temperature T2;
and if the T1-T2 is less than a, the electronic expansion valve is forced to increase the preset valve step.
2. The control method according to claim 1, wherein after forcing the electronic expansion valve to increase by a preset valve step, the control method further comprises:
detecting whether the operation of the air conditioner meets a preset condition or not;
and if the preset condition is met, the step of forcing the electronic expansion valve to increase the preset valve step is exited.
3. The control method according to claim 2, wherein the preset condition is one of:
the air conditioner exhaust temperature reaches the target exhaust temperature; or the like, or, alternatively,
forcing the electronic expansion valve to increase the continuous operation time after the preset valve step to reach t 2; or the like, or, alternatively,
T1-T2≥a。
4. The control method according to claim 1, wherein before detecting whether the startup valve step reaches a preset valve step lower limit, the control method further comprises:
dividing the outdoor environment temperature into temperature intervals;
and setting the lower limit of the valve step corresponding to each temperature interval.
5. The control method according to claim 4, wherein the temperature range includes Δ T1, Δ T2, and Δ T3, where Δ T1 ═ A, B), [ Δ T2 ═ B, C), [ Δ T3 ═ C, D ], [ Δ T1 at a lower limit of the valve step, Δ T2 at a lower limit of the valve step, s + D, Δ T3 at a lower limit of the valve step, and 0 < D < e.
6. The control method according to claim 5, wherein the predetermined valve step is f, f ≧ 10.
7. The control method according to claim 5, wherein the predetermined valve step for Δ T1 is f, the predetermined valve step for Δ T2 is f + x, the predetermined valve step for Δ T3 is f + y, and 0 < x < y.
8. The control method according to claim 5, wherein a.gtoreq.2.
9. The control method according to claim 5, wherein the predetermined temperature difference corresponding to Δ T1 is a, the predetermined temperature difference corresponding to Δ T2 is a-m, the predetermined temperature difference corresponding to Δ T2 is a-n, and 0 < m < n.
10. The control method according to claim 5, wherein B-A-C-B-D-C.
11. The control method of claim 1, wherein the electronic expansion valve instantaneously increases a preset valve step.
12. A control method of an air conditioner, characterized in that the electronic expansion valve is controlled by the control method according to any one of claims 1 to 11.
13. An air conditioner characterized in that the control method of an electronic expansion valve according to any one of claims 1 to 11 or the control method of an air conditioner according to claim 12 is applied.
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| JP2019039599A (en) * | 2017-08-24 | 2019-03-14 | 株式会社富士通ゼネラル | Air conditioning device |
| CN110500746A (en) * | 2018-05-18 | 2019-11-26 | 青岛海尔空调器有限总公司 | The control method of the electronic expansion valve opening of air conditioner |
| CN110726228A (en) * | 2019-10-29 | 2020-01-24 | 珠海格力电器股份有限公司 | Air conditioner, determination method and device of air outlet temperature of air conditioner and storage medium |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015059708A (en) * | 2013-09-19 | 2015-03-30 | ダイキン工業株式会社 | Refrigeration device |
| CN204313390U (en) * | 2014-11-07 | 2015-05-06 | 广东海悟科技有限公司 | A kind of low temperature refrigeration of air conditioner system |
| CN106871358A (en) * | 2017-02-28 | 2017-06-20 | 青岛海尔空调器有限总公司 | Temperature of outlet air of air conditioner control method and device |
| JP2019039599A (en) * | 2017-08-24 | 2019-03-14 | 株式会社富士通ゼネラル | Air conditioning device |
| CN108731211A (en) * | 2018-04-25 | 2018-11-02 | 武汉海尔电器股份有限公司 | Air conditioner and its control method |
| CN110500746A (en) * | 2018-05-18 | 2019-11-26 | 青岛海尔空调器有限总公司 | The control method of the electronic expansion valve opening of air conditioner |
| CN110726228A (en) * | 2019-10-29 | 2020-01-24 | 珠海格力电器股份有限公司 | Air conditioner, determination method and device of air outlet temperature of air conditioner and storage medium |
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