CN111854032B - 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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- CN111854032B CN111854032B CN202010668899.XA CN202010668899A CN111854032B CN 111854032 B CN111854032 B CN 111854032B CN 202010668899 A CN202010668899 A CN 202010668899A CN 111854032 B CN111854032 B CN 111854032B
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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
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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: after the unit is started for the first time, recording the external environment temperature T1 when the unit is started, and recording the initial valve step of the electronic expansion valve as A1; judging whether the unit operates stably; after the unit operates stably, recording the opening of the electronic expansion valve at the moment as A2; when the unit is started for the second time, recording the external environment temperature T2 when the unit is started, and when the external environment temperature T2 meets the preset condition, correcting the initial valve step of the electronic expansion valve to be A3, wherein A3 belongs to [ Amin, Amax ], wherein Amin is the smaller of A1 and A2, and Amax is the larger of A1 and A2. According to the control method of the electronic expansion valve, the problem that the air conditioner cannot be normally used due to the fact that a protection mechanism is triggered when the air conditioner is started due to overlarge load 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 an air conditioner, the regulation of the electronic expansion valve in the running process of the air conditioner is critical to the reliability of the whole air conditioning system, the initial regulation of the existing electronic expansion valve is mostly to preset an initial valve step according to the external environment temperature at the starting time, but the air conditioning unit can be subjected to abnormal conditions such as dirty blocking and the like as the time is longer along with the use of the air conditioning unit, the influence of the abnormal conditions on the condensation effect of the unit is very large, the initial valve step of the existing electronic expansion valve is confirmed according to the external environment temperature, so that the initial valve step of the electronic expansion valve is always consistent in the same environment as the unit, and under the conditions such as dirty blocking and the like, when the initial valve step of the electronic expansion valve is too small, the phenomena such as the incapability of a trigger protection mechanism due to the overlarge starting load of the unit can occur.
Disclosure of Invention
Therefore, the technical problem to be solved by the present application is to provide a control method of an electronic expansion valve, a control method of an air conditioner and an air conditioner, which can avoid the problem that the air conditioner cannot be normally used due to a trigger protection mechanism caused by an excessive load when the air conditioner is started.
In order to solve the above problem, the present application provides a control method of an electronic expansion valve, including:
after the unit is started for the first time, recording the external environment temperature T1 when the unit is started, and recording the initial valve step of the electronic expansion valve as A1;
judging whether the unit operates stably;
after the unit operates stably, recording the opening of the electronic expansion valve at the moment as A2;
when the unit is started for the second time, recording the external environment temperature T2 when the unit is started, and when the external environment temperature T2 meets the preset condition, correcting the initial valve step of the electronic expansion valve to be A3, wherein A3 belongs to [ Amin, Amax ], wherein Amin is the smaller of A1 and A2, and Amax is the larger of A1 and A2.
Preferably, the control method further includes:
dividing a temperature interval;
and judging whether T2 meets a preset condition according to the divided temperature intervals.
Preferably, the step of correcting the initial valve step of the electronic expansion valve to A3 when the external ambient temperature T2 satisfies a preset condition includes:
when the T1 and the T2 are in the same temperature range, judging that the external environment temperature T2 meets the preset condition, correcting the initial valve step of the electronic expansion valve to be A3, and updating the A3 serving as A1 of the temperature range;
and when the T1 and the T2 are in different temperature intervals, judging that the external environment temperature T2 does not meet the preset condition, and returning to the step after the unit is started for the first time.
Preferably, when T1 and T2 are in the same temperature range, the step of determining that the external environment temperature T2 satisfies the preset condition, modifying the initial valve step of the electronic expansion valve to A3, and updating a1 with A3 as the temperature range further includes:
recording the opening A2 of the electronic expansion valve when the unit operates stably in the process of the second starting operation of the unit;
when the unit is started for the third time, recording the external environment temperature T3 when the unit is started, and correcting the initial valve step of the electronic expansion valve to be A3 when the external environment temperature T3 meets the preset condition, wherein A3 belongs to [ Amin, Amax ].
Preferably, when T1 and T2 are located in different temperature ranges, it is determined that the external environment temperature T2 does not satisfy the preset condition, and the step of returning to the unit after the first startup includes:
when the T2 does not meet the preset condition, recording the initial valve step of the electronic expansion valve in the temperature range as A1 and the opening A2 of the electronic expansion valve when the unit is in the process of second starting operation;
when the unit is started for the third time, recording the external environment temperature T3 when the unit is started, correcting the initial valve step of the electronic expansion valve in the temperature interval of T3 to be A3 when the external environment temperature T3 meets the preset condition, and updating the A3 serving as A1 of the temperature interval, wherein A3 belongs to Amin and Amax.
Preferably, the step of dividing the temperature interval comprises:
dividing the temperature range of [ a, b ] into n temperature intervals, wherein the difference value of the upper limit value and the lower limit value of the temperature of each temperature interval is (b-a)/n.
Preferably, the step of judging whether the unit stably operates includes:
detecting the number of the fluctuation steps of the electronic expansion valve within the continuous time t 1;
and when the variation step number of the electronic expansion valve is less than or equal to the preset step number, judging that the unit is in a stable operation state.
Preferably, A3 ═ (a1+ a 2)/2.
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.
Preferably, the control method further includes:
judging whether the initial valve step of the unit when starting up exceeds a set valve step upper limit value or not;
and when the initial valve step exceeds the set valve step upper limit value, judging that the external unit is dirty and blocked, and controlling the air conditioner to enter a cleaning mode.
Preferably, after dividing the temperature intervals, each temperature interval corresponds to a valve step upper limit value.
According to another aspect of the present application, there is provided an air conditioner to which the control method of the above-described electronic expansion valve or the control method of the above-described air conditioner is applied.
The application provides a control method of an electronic expansion valve, which comprises the following steps: after the unit is started for the first time, recording the external environment temperature T1 when the unit is started, and recording the initial valve step of the electronic expansion valve as A1; judging whether the unit operates stably; after the unit operates stably, recording the opening A2 of the electronic expansion valve at the moment; when the unit is started for the second time, recording the external environment temperature T2 when the unit is started, and when the external environment temperature T2 meets the preset condition, correcting the initial valve step of the electronic expansion valve to be A3, wherein A3 belongs to [ Amin, Amax ], wherein Amin is the smaller of A1 and A2, and Amax is the larger of A1 and A2. The control method of the application is adopted to control the electronic expansion valve, so that the initial valve step of the electronic expansion valve when the unit is started to operate every time is related to the initial valve step of the electronic expansion valve when the unit is started to operate last time and the opening degree of the electronic expansion valve in a stable operation state, the electronic expansion valve when the unit is started to operate every time is not related to the environmental temperature, but can be adjusted according to the last initial valve step and the opening degree during stable operation, even if the air conditioner per se has a dirty blockage condition, the initial valve step of the electronic expansion valve determined when the unit is started to operate is not determined by the environmental temperature alone but is related to the opening degree during stable operation of the electronic expansion valve, and the opening degree during stable operation of the electronic expansion valve is related to the dirty blockage condition of the unit per se, so that the initial valve step of the electronic expansion valve determined when the unit is started to operate can be adjusted according to the dirty blockage condition, the initial valve step of the electronic expansion valve can be matched with the running state of the unit, so that the problem that the initial valve step is unreasonable in setting when the unit runs is effectively solved, and the problem that the air conditioner cannot be normally used due to the fact that the air conditioner is triggered when the air conditioner is started due to overlarge load is solved.
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: after the unit is started for the first time, recording the external environment temperature T1 when the unit is started, and recording the initial valve step of the electronic expansion valve as A1; judging whether the unit operates stably; after the unit operates stably, recording the opening A2 of the electronic expansion valve at the moment; when the unit is started for the second time, recording the external environment temperature T2 when the unit is started, and when the external environment temperature T2 meets the preset condition, correcting the initial valve step of the electronic expansion valve to be A3, wherein A3 belongs to [ Amin, Amax ], wherein Amin is the smaller of A1 and A2, and Amax is the larger of A1 and A2.
The control method of the application is adopted to control the electronic expansion valve, so that the initial valve step of the electronic expansion valve when the unit is started to operate every time is related to the initial valve step of the electronic expansion valve when the unit is started to operate last time and the opening degree of the electronic expansion valve in a stable operation state, the electronic expansion valve when the unit is started to operate every time is not related to the environmental temperature, but can be adjusted according to the last initial valve step and the opening degree during stable operation, even if the air conditioner per se has a dirty blockage condition, the initial valve step of the electronic expansion valve determined when the unit is started to operate is not determined by the environmental temperature alone but is related to the opening degree during stable operation of the electronic expansion valve, and the opening degree during stable operation of the electronic expansion valve is related to the dirty blockage condition of the unit per se, so that the initial valve step of the electronic expansion valve determined when the unit is started to operate can be adjusted according to the dirty blockage condition, the initial valve step of the electronic expansion valve can be matched with the running state of the unit, so that the problem that the initial valve step is unreasonable in setting when the unit runs is effectively solved, and the problem that the air conditioner cannot be normally used due to the fact that the air conditioner is triggered when the air conditioner is started due to overlarge load is solved.
By the control method, the initial valve step can be closer to the stable valve step, so that the next startup adjustment of the unit can reach a stable state more quickly, the matching of the initial valve step and the self running condition of the unit is ensured, and the adjustment efficiency of the electronic expansion valve can be improved.
The control method further comprises the following steps: dividing a temperature interval; and judging whether T2 meets a preset condition according to the divided temperature intervals. Because the initial valve step of the electronic expansion valve is related to the outdoor environment temperature, the temperature interval is divided into the outdoor environment temperature, and whether the T2 meets the preset condition or not is judged according to the divided temperature interval, so that the initial valve step can be set more reasonably, and the accuracy and the reliability after the initial valve step is corrected are ensured.
When the external environment temperature T2 meets the preset condition, the step of correcting the initial valve step of the electronic expansion valve to A3 comprises the following steps: when the T1 and the T2 are in the same temperature range, judging that the external environment temperature T2 meets the preset condition, correcting the initial valve step of the electronic expansion valve to be A3, and updating the A3 serving as A1 of the temperature range; and when the T1 and the T2 are in different temperature intervals, judging that the external environment temperature T2 does not meet the preset condition, and returning to the step after the unit is started for the first time.
TABLE 1
△T1 | △T2 | △T3 | △T4 | △T5 | |
Temperature range | 0-10 | 10-20 | 20-30 | 30-40 | 40-48 |
Upper limit of valve step | 250 | 350 | 400 | 440 | 480 |
Table 1 shows the temperature division zones of the present application and the upper valve step limits corresponding to the temperature zones, wherein the temperature ranges of the temperature zones can be adjusted as required, and are not limited to the limitations of the above table.
When T1 and T2 are in the same temperature range, the step of determining that the external environment temperature T2 satisfies the preset condition, correcting the initial valve step of the electronic expansion valve to A3, and updating A3 as a1 of the temperature range further includes: recording the opening A2 of the electronic expansion valve when the unit operates stably in the process of the second starting operation of the unit; when the unit is started for the third time, recording the external environment temperature T3 when the unit is started, and correcting the initial valve step of the electronic expansion valve to be A3 when the external environment temperature T3 meets the preset condition, wherein A3 belongs to [ Amin, Amax ].
For example, when the engine is started for the first time, T1 is 15 ℃, a1 is 200 steps, a2 is 250 steps, when the engine is started for the second time, T2 is 18 ℃, since T1 and T2 are both located in the same temperature range Δ T2, the initial valve step can be corrected, at this time, A3 is 225 steps, that is, when the engine is started for the second time, the electronic expansion valve is controlled by using 225 steps as the initial valve step, at this time, the difference between the initial operation valve step of the electronic expansion valve and the stable operation valve step is small, the electronic expansion valve can be quickly adjusted to the stable operation valve step, and when the engine set is stably operated, the valve step of the electronic expansion valve is 253 steps.
Then, the initial valve step A3 is updated to a1 and recorded, and the step 253 of the stable operation of the electronic expansion valve at the time of the second startup is updated to a2 and recorded, that is, when the electronic expansion valve is started for the third time, the step a1 is 225, the step a2 is 253, at this time, it is necessary to determine whether the outdoor environment temperature T3 recorded at the time of the third startup is in the same temperature interval as the temperature interval T2, and then the initial valve step of the electronic expansion valve is controlled according to the determination result.
For example, when T3 is 17 ℃, T2 and T3 are located in the same temperature interval, at this time, the calculation A3 is 239 steps, and the 239 steps are updated to a new initial valve step a1 of the temperature interval, so that the calculation of the initial valve step at the next startup is performed, and so on, the adjustment of the initial valve step of the electronic expansion valve is realized, so that the initial valve step is closer to the valve step when the electronic expansion valve is stably operated, the valve step is not affected by the dirty and blocked condition of the unit, the operation performance is more stable, and the reliable operation of the unit is ensured.
When the temperature T1 and the temperature T2 are in different temperature ranges, the external environment temperature T2 is judged not to meet the preset condition, and the step of returning to the first startup of the unit comprises the following steps: when the T2 does not meet the preset condition, recording the initial valve step of the electronic expansion valve in the temperature range as A1 and the opening A2 of the electronic expansion valve when the unit is in the process of second starting operation; when the unit is started for the third time, recording the external environment temperature T3 when the unit is started, correcting the initial valve step of the electronic expansion valve in the temperature interval of T3 to be A3 when the external environment temperature T3 meets the preset condition, and updating the A3 serving as A1 of the temperature interval, wherein A3 belongs to Amin and Amax.
For example, when the electronic expansion valve is started for the first time, T1 is 15 ℃, a1 is 200 steps, and a2 is 250 steps, when the electronic expansion valve is started for the second time, T2 is 22 ℃, because T1 and T2 are not located in the range of Δ T2 of the same temperature interval, the temperature and the initial valve step need to be recorded again, that is, when the electronic expansion valve is started for the second time, the electronic expansion valve needs to determine the initial valve step a1 of the electronic expansion valve in the temperature interval according to the temperature T2, record the initial valve step a1 of the temperature interval, after the set is stably operated, record the stably operated valve step a2 of the temperature interval, if the electronic expansion valve is started for the second time, a1 is 210 steps, and a2 is 270 steps, then record the temperature interval in which the electronic expansion valve is located by T2, a1 is 210 steps, and a2 is 270 steps.
In the third startup, if T3 is 17 ℃, since T3 and T1 at the first startup are located in the same temperature interval, in this case, a1 at the third startup is 200 steps, a2 is 250 steps, the initial valve step after the third startup is corrected to A3 step which is 225 steps, and then the initial valve step A3 step after the third startup needs to be updated to the initial valve step a1 of the temperature interval, and the valve step during the stable operation after the third startup is updated to the stable operation valve step a2 of the temperature interval, and recording is performed.
In the third startup, if T3 is 25 ℃, since T3 and T1 at the second startup are located in the same temperature interval, in this case, a1 at the third startup is 210 steps, a2 is 270 steps, the initial valve step after the third startup is corrected to A3 step which is 240 steps, and then the initial valve step A3 after the third startup is required to be updated to the initial valve step a1 at the temperature interval, and the valve step during the stable operation after the third startup is updated to the stable operation valve step a2 at the temperature interval, and recording is performed.
Preferably, the step of dividing the temperature interval includes: dividing the temperature range of [ a, b ] into n temperature intervals, wherein the difference value of the upper limit value and the lower limit value of the temperature of each temperature interval is (b-a)/n. For example, in the present application, within the range interval of [0, 50 ℃ ], the temperature range may be divided into 5 temperature intervals, where the first temperature interval Δ T1 ═ 0, 10 ℃), the second temperature interval Δ T2 ═ 10, 20 ℃); third temperature interval Δ T3 ═ 20, 30 ℃), fourth temperature interval Δ T4 ═ 30, 40 ℃); the fifth temperature interval Δ T5 ═ 40, 50 ℃.
Of course, when dividing the temperature intervals, the temperature ranges of the respective temperature intervals do not need to be set to be the same, and the adjustment may be performed according to actual needs, for example, the initial valve steps of the electronic expansion valves in different temperature ranges may be divided.
The step of judging whether the unit stably operates comprises the following steps: detecting the number of the fluctuation steps of the electronic expansion valve within the continuous time t 1; and when the variation step number of the electronic expansion valve is less than or equal to the preset step number, judging that the unit is in a stable operation state. Here, t1 is, for example, 10min, and the preset number of steps is, for example, 2 steps.
Preferably, A3 is (a1+ a2)/2, which further enables the initial valve step to be closer to the steady valve step, and further enables the next startup adjustment of the unit to reach the steady state more quickly.
According to the embodiment of the application, the control method of the air conditioner is adopted to control the electronic expansion valve.
The control method further comprises the following steps: judging whether the initial valve step of the unit when starting up exceeds a set valve step upper limit value or not; and when the initial valve step exceeds the set valve step upper limit value, judging that the external unit is dirty and blocked, and controlling the air conditioner to enter a cleaning mode.
After the temperature intervals are divided, each temperature interval corresponds to one valve step upper limit value, so that the outdoor temperature intervals in the operation process of the air conditioner can be subdivided, the control of the electronic expansion valve is finely controlled, and whether the outdoor unit is dirty or not is accurately judged.
Along with the influence of the operation age of the unit, the condition of the unit changes, the dirty blocking condition is gradually serious, and the initial valve step also changes. For the same temperature interval, the more serious the unit is dirty, in order to reduce the operation load of the compressor and ensure that the unit can normally start to operate, the larger the initial valve step of the electronic expansion valve when the unit is started, and the larger the initial valve step a3 calculated when the unit is started exceeds the upper limit value of the valve step of the corresponding temperature interval in table 1, it indicates that the external unit is dirty and blocked, and the dirty and blocked condition reaches the point needing cleaning, and at this time, the unit compressor can be controlled to stop, the external fan is reversely rotated, and the external unit is forcibly cleaned.
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 (10)
1. A control method of an electronic expansion valve, comprising:
after the unit is started for the first time, recording the external environment temperature T1 when the unit is started, and recording the initial valve step of the electronic expansion valve as A1;
judging whether the unit operates stably;
after the unit operates stably, recording the opening of the electronic expansion valve at the moment as A2;
when the unit is started for the second time, recording the external environment temperature T2 when the unit is started, and correcting the initial valve step of the electronic expansion valve to be A3 when the external environment temperature T2 meets the preset condition, wherein A3 belongs to [ Amin, Amax ], wherein Amin is the smaller of A1 and A2, and Amax is the larger of A1 and A2;
the control method further comprises the following steps:
dividing a temperature interval;
judging whether T2 meets a preset condition according to the divided temperature intervals;
when the external environment temperature T2 meets the preset condition, the step of correcting the initial valve step of the electronic expansion valve to A3 comprises the following steps:
when the T1 and the T2 are in the same temperature range, judging that the external environment temperature T2 meets the preset condition, correcting the initial valve step of the electronic expansion valve to be A3, and updating the A3 serving as A1 of the temperature range;
and when the T1 and the T2 are in different temperature intervals, judging that the external environment temperature T2 does not meet the preset condition, and returning to the step after the unit is started for the first time.
2. The control method according to claim 1, wherein the step of determining that the external environment temperature T2 satisfies the preset condition when T1 and T2 are in the same temperature range, correcting the initial valve step of the electronic expansion valve to A3, and updating A3 as a1 of the temperature range further comprises:
recording the opening A2 of the electronic expansion valve when the unit operates stably in the process of the second starting operation of the unit;
when the unit is started for the third time, recording the external environment temperature T3 when the unit is started, and correcting the initial valve step of the electronic expansion valve to be A3 when the external environment temperature T3 meets the preset condition, wherein A3 belongs to [ Amin, Amax ].
3. The control method according to claim 1, wherein when T1 and T2 are in different temperature ranges, it is determined that the external environment temperature T2 does not satisfy the preset condition, and the step of returning to the first startup of the unit includes:
when the T2 does not meet the preset condition, recording the initial valve step of the electronic expansion valve in the temperature range as A1 and the opening A2 of the electronic expansion valve when the unit is in the process of second starting operation;
when the unit is started for the third time, recording the external environment temperature T3 when the unit is started, correcting the initial valve step of the electronic expansion valve in the temperature interval of T3 to be A3 when the external environment temperature T3 meets the preset condition, and updating the A3 serving as A1 of the temperature interval, wherein A3 belongs to Amin and Amax.
4. The control method according to claim 1, wherein the step of dividing the temperature intervals comprises:
dividing the temperature range of [ a, b ] into n temperature intervals, wherein the difference value of the upper limit value and the lower limit value of the temperature of each temperature interval is (b-a)/n.
5. The control method according to claim 1, wherein the step of judging whether the unit is stably operated comprises:
detecting the number of the fluctuation steps of the electronic expansion valve within the continuous time t 1;
and when the variation step number of the electronic expansion valve is less than or equal to the preset step number, judging that the unit is in a stable operation state.
6. The control method according to any one of claims 1 to 5, wherein A3 ═ (A1+ A2)/2.
7. 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 6.
8. The control method according to claim 7, characterized by further comprising:
judging whether the initial valve step of the unit when starting up exceeds a set valve step upper limit value or not;
and when the initial valve step exceeds the set valve step upper limit value, judging that the external unit is dirty and blocked, and controlling the air conditioner to enter a cleaning mode.
9. The control method according to claim 8, wherein after the temperature intervals are divided, each temperature interval corresponds to one valve step upper limit value.
10. An air conditioner characterized in that the control method of the electronic expansion valve according to any one of claims 1 to 6 or the control method of the air conditioner according to any one of claims 7 to 9 is applied.
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